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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/ext4/super.c4 *5 * Copyright (C) 1992, 1993, 1994, 19956 * Remy Card (card@masi.ibp.fr)7 * Laboratoire MASI - Institut Blaise Pascal8 * Universite Pierre et Marie Curie (Paris VI)9 *10 * from11 *12 * linux/fs/minix/inode.c13 *14 * Copyright (C) 1991, 1992 Linus Torvalds15 *16 * Big-endian to little-endian byte-swapping/bitmaps by17 * David S. Miller (davem@caip.rutgers.edu), 199518 */19 20#include <linux/module.h>21#include <linux/string.h>22#include <linux/fs.h>23#include <linux/time.h>24#include <linux/vmalloc.h>25#include <linux/slab.h>26#include <linux/init.h>27#include <linux/blkdev.h>28#include <linux/backing-dev.h>29#include <linux/parser.h>30#include <linux/buffer_head.h>31#include <linux/exportfs.h>32#include <linux/vfs.h>33#include <linux/random.h>34#include <linux/mount.h>35#include <linux/namei.h>36#include <linux/quotaops.h>37#include <linux/seq_file.h>38#include <linux/ctype.h>39#include <linux/log2.h>40#include <linux/crc16.h>41#include <linux/dax.h>42#include <linux/uaccess.h>43#include <linux/iversion.h>44#include <linux/unicode.h>45#include <linux/part_stat.h>46#include <linux/kthread.h>47#include <linux/freezer.h>48#include <linux/fsnotify.h>49#include <linux/fs_context.h>50#include <linux/fs_parser.h>51 52#include "ext4.h"53#include "ext4_extents.h" /* Needed for trace points definition */54#include "ext4_jbd2.h"55#include "xattr.h"56#include "acl.h"57#include "mballoc.h"58#include "fsmap.h"59 60#define CREATE_TRACE_POINTS61#include <trace/events/ext4.h>62 63static struct ext4_lazy_init *ext4_li_info;64static DEFINE_MUTEX(ext4_li_mtx);65static struct ratelimit_state ext4_mount_msg_ratelimit;66 67static int ext4_load_journal(struct super_block *, struct ext4_super_block *,68 unsigned long journal_devnum);69static int ext4_show_options(struct seq_file *seq, struct dentry *root);70static void ext4_update_super(struct super_block *sb);71static int ext4_commit_super(struct super_block *sb);72static int ext4_mark_recovery_complete(struct super_block *sb,73 struct ext4_super_block *es);74static int ext4_clear_journal_err(struct super_block *sb,75 struct ext4_super_block *es);76static int ext4_sync_fs(struct super_block *sb, int wait);77static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);78static int ext4_unfreeze(struct super_block *sb);79static int ext4_freeze(struct super_block *sb);80static inline int ext2_feature_set_ok(struct super_block *sb);81static inline int ext3_feature_set_ok(struct super_block *sb);82static void ext4_destroy_lazyinit_thread(void);83static void ext4_unregister_li_request(struct super_block *sb);84static void ext4_clear_request_list(void);85static struct inode *ext4_get_journal_inode(struct super_block *sb,86 unsigned int journal_inum);87static int ext4_validate_options(struct fs_context *fc);88static int ext4_check_opt_consistency(struct fs_context *fc,89 struct super_block *sb);90static void ext4_apply_options(struct fs_context *fc, struct super_block *sb);91static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);92static int ext4_get_tree(struct fs_context *fc);93static int ext4_reconfigure(struct fs_context *fc);94static void ext4_fc_free(struct fs_context *fc);95static int ext4_init_fs_context(struct fs_context *fc);96static void ext4_kill_sb(struct super_block *sb);97static const struct fs_parameter_spec ext4_param_specs[];98 99/*100 * Lock ordering101 *102 * page fault path:103 * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start104 * -> page lock -> i_data_sem (rw)105 *106 * buffered write path:107 * sb_start_write -> i_mutex -> mmap_lock108 * sb_start_write -> i_mutex -> transaction start -> page lock ->109 * i_data_sem (rw)110 *111 * truncate:112 * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->113 * page lock114 * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->115 * i_data_sem (rw)116 *117 * direct IO:118 * sb_start_write -> i_mutex -> mmap_lock119 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)120 *121 * writepages:122 * transaction start -> page lock(s) -> i_data_sem (rw)123 */124 125static const struct fs_context_operations ext4_context_ops = {126 .parse_param = ext4_parse_param,127 .get_tree = ext4_get_tree,128 .reconfigure = ext4_reconfigure,129 .free = ext4_fc_free,130};131 132 133#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)134static struct file_system_type ext2_fs_type = {135 .owner = THIS_MODULE,136 .name = "ext2",137 .init_fs_context = ext4_init_fs_context,138 .parameters = ext4_param_specs,139 .kill_sb = ext4_kill_sb,140 .fs_flags = FS_REQUIRES_DEV,141};142MODULE_ALIAS_FS("ext2");143MODULE_ALIAS("ext2");144#define IS_EXT2_SB(sb) ((sb)->s_type == &ext2_fs_type)145#else146#define IS_EXT2_SB(sb) (0)147#endif148 149 150static struct file_system_type ext3_fs_type = {151 .owner = THIS_MODULE,152 .name = "ext3",153 .init_fs_context = ext4_init_fs_context,154 .parameters = ext4_param_specs,155 .kill_sb = ext4_kill_sb,156 .fs_flags = FS_REQUIRES_DEV,157};158MODULE_ALIAS_FS("ext3");159MODULE_ALIAS("ext3");160#define IS_EXT3_SB(sb) ((sb)->s_type == &ext3_fs_type)161 162 163static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,164 bh_end_io_t *end_io)165{166 /*167 * buffer's verified bit is no longer valid after reading from168 * disk again due to write out error, clear it to make sure we169 * recheck the buffer contents.170 */171 clear_buffer_verified(bh);172 173 bh->b_end_io = end_io ? end_io : end_buffer_read_sync;174 get_bh(bh);175 submit_bh(REQ_OP_READ | op_flags, bh);176}177 178void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,179 bh_end_io_t *end_io)180{181 BUG_ON(!buffer_locked(bh));182 183 if (ext4_buffer_uptodate(bh)) {184 unlock_buffer(bh);185 return;186 }187 __ext4_read_bh(bh, op_flags, end_io);188}189 190int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io)191{192 BUG_ON(!buffer_locked(bh));193 194 if (ext4_buffer_uptodate(bh)) {195 unlock_buffer(bh);196 return 0;197 }198 199 __ext4_read_bh(bh, op_flags, end_io);200 201 wait_on_buffer(bh);202 if (buffer_uptodate(bh))203 return 0;204 return -EIO;205}206 207int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait)208{209 lock_buffer(bh);210 if (!wait) {211 ext4_read_bh_nowait(bh, op_flags, NULL);212 return 0;213 }214 return ext4_read_bh(bh, op_flags, NULL);215}216 217/*218 * This works like __bread_gfp() except it uses ERR_PTR for error219 * returns. Currently with sb_bread it's impossible to distinguish220 * between ENOMEM and EIO situations (since both result in a NULL221 * return.222 */223static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,224 sector_t block,225 blk_opf_t op_flags, gfp_t gfp)226{227 struct buffer_head *bh;228 int ret;229 230 bh = sb_getblk_gfp(sb, block, gfp);231 if (bh == NULL)232 return ERR_PTR(-ENOMEM);233 if (ext4_buffer_uptodate(bh))234 return bh;235 236 ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);237 if (ret) {238 put_bh(bh);239 return ERR_PTR(ret);240 }241 return bh;242}243 244struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,245 blk_opf_t op_flags)246{247 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping,248 ~__GFP_FS) | __GFP_MOVABLE;249 250 return __ext4_sb_bread_gfp(sb, block, op_flags, gfp);251}252 253struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,254 sector_t block)255{256 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping,257 ~__GFP_FS);258 259 return __ext4_sb_bread_gfp(sb, block, 0, gfp);260}261 262void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)263{264 struct buffer_head *bh = bdev_getblk(sb->s_bdev, block,265 sb->s_blocksize, GFP_NOWAIT | __GFP_NOWARN);266 267 if (likely(bh)) {268 if (trylock_buffer(bh))269 ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL);270 brelse(bh);271 }272}273 274static int ext4_verify_csum_type(struct super_block *sb,275 struct ext4_super_block *es)276{277 if (!ext4_has_feature_metadata_csum(sb))278 return 1;279 280 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;281}282 283__le32 ext4_superblock_csum(struct super_block *sb,284 struct ext4_super_block *es)285{286 struct ext4_sb_info *sbi = EXT4_SB(sb);287 int offset = offsetof(struct ext4_super_block, s_checksum);288 __u32 csum;289 290 csum = ext4_chksum(sbi, ~0, (char *)es, offset);291 292 return cpu_to_le32(csum);293}294 295static int ext4_superblock_csum_verify(struct super_block *sb,296 struct ext4_super_block *es)297{298 if (!ext4_has_metadata_csum(sb))299 return 1;300 301 return es->s_checksum == ext4_superblock_csum(sb, es);302}303 304void ext4_superblock_csum_set(struct super_block *sb)305{306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;307 308 if (!ext4_has_metadata_csum(sb))309 return;310 311 es->s_checksum = ext4_superblock_csum(sb, es);312}313 314ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,315 struct ext4_group_desc *bg)316{317 return le32_to_cpu(bg->bg_block_bitmap_lo) |318 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?319 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);320}321 322ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,323 struct ext4_group_desc *bg)324{325 return le32_to_cpu(bg->bg_inode_bitmap_lo) |326 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?327 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);328}329 330ext4_fsblk_t ext4_inode_table(struct super_block *sb,331 struct ext4_group_desc *bg)332{333 return le32_to_cpu(bg->bg_inode_table_lo) |334 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?335 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);336}337 338__u32 ext4_free_group_clusters(struct super_block *sb,339 struct ext4_group_desc *bg)340{341 return le16_to_cpu(bg->bg_free_blocks_count_lo) |342 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?343 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);344}345 346__u32 ext4_free_inodes_count(struct super_block *sb,347 struct ext4_group_desc *bg)348{349 return le16_to_cpu(bg->bg_free_inodes_count_lo) |350 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?351 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);352}353 354__u32 ext4_used_dirs_count(struct super_block *sb,355 struct ext4_group_desc *bg)356{357 return le16_to_cpu(bg->bg_used_dirs_count_lo) |358 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?359 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);360}361 362__u32 ext4_itable_unused_count(struct super_block *sb,363 struct ext4_group_desc *bg)364{365 return le16_to_cpu(bg->bg_itable_unused_lo) |366 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?367 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);368}369 370void ext4_block_bitmap_set(struct super_block *sb,371 struct ext4_group_desc *bg, ext4_fsblk_t blk)372{373 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);374 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)375 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);376}377 378void ext4_inode_bitmap_set(struct super_block *sb,379 struct ext4_group_desc *bg, ext4_fsblk_t blk)380{381 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);382 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)383 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);384}385 386void ext4_inode_table_set(struct super_block *sb,387 struct ext4_group_desc *bg, ext4_fsblk_t blk)388{389 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);390 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)391 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);392}393 394void ext4_free_group_clusters_set(struct super_block *sb,395 struct ext4_group_desc *bg, __u32 count)396{397 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);398 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)399 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);400}401 402void ext4_free_inodes_set(struct super_block *sb,403 struct ext4_group_desc *bg, __u32 count)404{405 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);406 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)407 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);408}409 410void ext4_used_dirs_set(struct super_block *sb,411 struct ext4_group_desc *bg, __u32 count)412{413 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);414 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)415 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);416}417 418void ext4_itable_unused_set(struct super_block *sb,419 struct ext4_group_desc *bg, __u32 count)420{421 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);422 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)423 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);424}425 426static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)427{428 now = clamp_val(now, 0, (1ull << 40) - 1);429 430 *lo = cpu_to_le32(lower_32_bits(now));431 *hi = upper_32_bits(now);432}433 434static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)435{436 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);437}438#define ext4_update_tstamp(es, tstamp) \439 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \440 ktime_get_real_seconds())441#define ext4_get_tstamp(es, tstamp) \442 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)443 444#define EXT4_SB_REFRESH_INTERVAL_SEC (3600) /* seconds (1 hour) */445#define EXT4_SB_REFRESH_INTERVAL_KB (16384) /* kilobytes (16MB) */446 447/*448 * The ext4_maybe_update_superblock() function checks and updates the449 * superblock if needed.450 *451 * This function is designed to update the on-disk superblock only under452 * certain conditions to prevent excessive disk writes and unnecessary453 * waking of the disk from sleep. The superblock will be updated if:454 * 1. More than an hour has passed since the last superblock update, and455 * 2. More than 16MB have been written since the last superblock update.456 *457 * @sb: The superblock458 */459static void ext4_maybe_update_superblock(struct super_block *sb)460{461 struct ext4_sb_info *sbi = EXT4_SB(sb);462 struct ext4_super_block *es = sbi->s_es;463 journal_t *journal = sbi->s_journal;464 time64_t now;465 __u64 last_update;466 __u64 lifetime_write_kbytes;467 __u64 diff_size;468 469 if (sb_rdonly(sb) || !(sb->s_flags & SB_ACTIVE) ||470 !journal || (journal->j_flags & JBD2_UNMOUNT))471 return;472 473 now = ktime_get_real_seconds();474 last_update = ext4_get_tstamp(es, s_wtime);475 476 if (likely(now - last_update < EXT4_SB_REFRESH_INTERVAL_SEC))477 return;478 479 lifetime_write_kbytes = sbi->s_kbytes_written +480 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -481 sbi->s_sectors_written_start) >> 1);482 483 /* Get the number of kilobytes not written to disk to account484 * for statistics and compare with a multiple of 16 MB. This485 * is used to determine when the next superblock commit should486 * occur (i.e. not more often than once per 16MB if there was487 * less written in an hour).488 */489 diff_size = lifetime_write_kbytes - le64_to_cpu(es->s_kbytes_written);490 491 if (diff_size > EXT4_SB_REFRESH_INTERVAL_KB)492 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);493}494 495static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)496{497 struct super_block *sb = journal->j_private;498 struct ext4_sb_info *sbi = EXT4_SB(sb);499 int error = is_journal_aborted(journal);500 struct ext4_journal_cb_entry *jce;501 502 BUG_ON(txn->t_state == T_FINISHED);503 504 ext4_process_freed_data(sb, txn->t_tid);505 ext4_maybe_update_superblock(sb);506 507 spin_lock(&sbi->s_md_lock);508 while (!list_empty(&txn->t_private_list)) {509 jce = list_entry(txn->t_private_list.next,510 struct ext4_journal_cb_entry, jce_list);511 list_del_init(&jce->jce_list);512 spin_unlock(&sbi->s_md_lock);513 jce->jce_func(sb, jce, error);514 spin_lock(&sbi->s_md_lock);515 }516 spin_unlock(&sbi->s_md_lock);517}518 519/*520 * This writepage callback for write_cache_pages()521 * takes care of a few cases after page cleaning.522 *523 * write_cache_pages() already checks for dirty pages524 * and calls clear_page_dirty_for_io(), which we want,525 * to write protect the pages.526 *527 * However, we may have to redirty a page (see below.)528 */529static int ext4_journalled_writepage_callback(struct folio *folio,530 struct writeback_control *wbc,531 void *data)532{533 transaction_t *transaction = (transaction_t *) data;534 struct buffer_head *bh, *head;535 struct journal_head *jh;536 537 bh = head = folio_buffers(folio);538 do {539 /*540 * We have to redirty a page in these cases:541 * 1) If buffer is dirty, it means the page was dirty because it542 * contains a buffer that needs checkpointing. So the dirty bit543 * needs to be preserved so that checkpointing writes the buffer544 * properly.545 * 2) If buffer is not part of the committing transaction546 * (we may have just accidentally come across this buffer because547 * inode range tracking is not exact) or if the currently running548 * transaction already contains this buffer as well, dirty bit549 * needs to be preserved so that the buffer gets writeprotected550 * properly on running transaction's commit.551 */552 jh = bh2jh(bh);553 if (buffer_dirty(bh) ||554 (jh && (jh->b_transaction != transaction ||555 jh->b_next_transaction))) {556 folio_redirty_for_writepage(wbc, folio);557 goto out;558 }559 } while ((bh = bh->b_this_page) != head);560 561out:562 return AOP_WRITEPAGE_ACTIVATE;563}564 565static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)566{567 struct address_space *mapping = jinode->i_vfs_inode->i_mapping;568 struct writeback_control wbc = {569 .sync_mode = WB_SYNC_ALL,570 .nr_to_write = LONG_MAX,571 .range_start = jinode->i_dirty_start,572 .range_end = jinode->i_dirty_end,573 };574 575 return write_cache_pages(mapping, &wbc,576 ext4_journalled_writepage_callback,577 jinode->i_transaction);578}579 580static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)581{582 int ret;583 584 if (ext4_should_journal_data(jinode->i_vfs_inode))585 ret = ext4_journalled_submit_inode_data_buffers(jinode);586 else587 ret = ext4_normal_submit_inode_data_buffers(jinode);588 return ret;589}590 591static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)592{593 int ret = 0;594 595 if (!ext4_should_journal_data(jinode->i_vfs_inode))596 ret = jbd2_journal_finish_inode_data_buffers(jinode);597 598 return ret;599}600 601static bool system_going_down(void)602{603 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF604 || system_state == SYSTEM_RESTART;605}606 607struct ext4_err_translation {608 int code;609 int errno;610};611 612#define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }613 614static struct ext4_err_translation err_translation[] = {615 EXT4_ERR_TRANSLATE(EIO),616 EXT4_ERR_TRANSLATE(ENOMEM),617 EXT4_ERR_TRANSLATE(EFSBADCRC),618 EXT4_ERR_TRANSLATE(EFSCORRUPTED),619 EXT4_ERR_TRANSLATE(ENOSPC),620 EXT4_ERR_TRANSLATE(ENOKEY),621 EXT4_ERR_TRANSLATE(EROFS),622 EXT4_ERR_TRANSLATE(EFBIG),623 EXT4_ERR_TRANSLATE(EEXIST),624 EXT4_ERR_TRANSLATE(ERANGE),625 EXT4_ERR_TRANSLATE(EOVERFLOW),626 EXT4_ERR_TRANSLATE(EBUSY),627 EXT4_ERR_TRANSLATE(ENOTDIR),628 EXT4_ERR_TRANSLATE(ENOTEMPTY),629 EXT4_ERR_TRANSLATE(ESHUTDOWN),630 EXT4_ERR_TRANSLATE(EFAULT),631};632 633static int ext4_errno_to_code(int errno)634{635 int i;636 637 for (i = 0; i < ARRAY_SIZE(err_translation); i++)638 if (err_translation[i].errno == errno)639 return err_translation[i].code;640 return EXT4_ERR_UNKNOWN;641}642 643static void save_error_info(struct super_block *sb, int error,644 __u32 ino, __u64 block,645 const char *func, unsigned int line)646{647 struct ext4_sb_info *sbi = EXT4_SB(sb);648 649 /* We default to EFSCORRUPTED error... */650 if (error == 0)651 error = EFSCORRUPTED;652 653 spin_lock(&sbi->s_error_lock);654 sbi->s_add_error_count++;655 sbi->s_last_error_code = error;656 sbi->s_last_error_line = line;657 sbi->s_last_error_ino = ino;658 sbi->s_last_error_block = block;659 sbi->s_last_error_func = func;660 sbi->s_last_error_time = ktime_get_real_seconds();661 if (!sbi->s_first_error_time) {662 sbi->s_first_error_code = error;663 sbi->s_first_error_line = line;664 sbi->s_first_error_ino = ino;665 sbi->s_first_error_block = block;666 sbi->s_first_error_func = func;667 sbi->s_first_error_time = sbi->s_last_error_time;668 }669 spin_unlock(&sbi->s_error_lock);670}671 672/* Deal with the reporting of failure conditions on a filesystem such as673 * inconsistencies detected or read IO failures.674 *675 * On ext2, we can store the error state of the filesystem in the676 * superblock. That is not possible on ext4, because we may have other677 * write ordering constraints on the superblock which prevent us from678 * writing it out straight away; and given that the journal is about to679 * be aborted, we can't rely on the current, or future, transactions to680 * write out the superblock safely.681 *682 * We'll just use the jbd2_journal_abort() error code to record an error in683 * the journal instead. On recovery, the journal will complain about684 * that error until we've noted it down and cleared it.685 *686 * If force_ro is set, we unconditionally force the filesystem into an687 * ABORT|READONLY state, unless the error response on the fs has been set to688 * panic in which case we take the easy way out and panic immediately. This is689 * used to deal with unrecoverable failures such as journal IO errors or ENOMEM690 * at a critical moment in log management.691 */692static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,693 __u32 ino, __u64 block,694 const char *func, unsigned int line)695{696 journal_t *journal = EXT4_SB(sb)->s_journal;697 bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);698 699 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;700 if (test_opt(sb, WARN_ON_ERROR))701 WARN_ON_ONCE(1);702 703 if (!continue_fs && !sb_rdonly(sb)) {704 set_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);705 if (journal)706 jbd2_journal_abort(journal, -EIO);707 }708 709 if (!bdev_read_only(sb->s_bdev)) {710 save_error_info(sb, error, ino, block, func, line);711 /*712 * In case the fs should keep running, we need to writeout713 * superblock through the journal. Due to lock ordering714 * constraints, it may not be safe to do it right here so we715 * defer superblock flushing to a workqueue.716 */717 if (continue_fs && journal)718 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);719 else720 ext4_commit_super(sb);721 }722 723 /*724 * We force ERRORS_RO behavior when system is rebooting. Otherwise we725 * could panic during 'reboot -f' as the underlying device got already726 * disabled.727 */728 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {729 panic("EXT4-fs (device %s): panic forced after error\n",730 sb->s_id);731 }732 733 if (sb_rdonly(sb) || continue_fs)734 return;735 736 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");737 /*738 * EXT4_FLAGS_SHUTDOWN was set which stops all filesystem739 * modifications. We don't set SB_RDONLY because that requires740 * sb->s_umount semaphore and setting it without proper remount741 * procedure is confusing code such as freeze_super() leading to742 * deadlocks and other problems.743 */744}745 746static void update_super_work(struct work_struct *work)747{748 struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,749 s_sb_upd_work);750 journal_t *journal = sbi->s_journal;751 handle_t *handle;752 753 /*754 * If the journal is still running, we have to write out superblock755 * through the journal to avoid collisions of other journalled sb756 * updates.757 *758 * We use directly jbd2 functions here to avoid recursing back into759 * ext4 error handling code during handling of previous errors.760 */761 if (!sb_rdonly(sbi->s_sb) && journal) {762 struct buffer_head *sbh = sbi->s_sbh;763 bool call_notify_err = false;764 765 handle = jbd2_journal_start(journal, 1);766 if (IS_ERR(handle))767 goto write_directly;768 if (jbd2_journal_get_write_access(handle, sbh)) {769 jbd2_journal_stop(handle);770 goto write_directly;771 }772 773 if (sbi->s_add_error_count > 0)774 call_notify_err = true;775 776 ext4_update_super(sbi->s_sb);777 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {778 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "779 "superblock detected");780 clear_buffer_write_io_error(sbh);781 set_buffer_uptodate(sbh);782 }783 784 if (jbd2_journal_dirty_metadata(handle, sbh)) {785 jbd2_journal_stop(handle);786 goto write_directly;787 }788 jbd2_journal_stop(handle);789 790 if (call_notify_err)791 ext4_notify_error_sysfs(sbi);792 793 return;794 }795write_directly:796 /*797 * Write through journal failed. Write sb directly to get error info798 * out and hope for the best.799 */800 ext4_commit_super(sbi->s_sb);801 ext4_notify_error_sysfs(sbi);802}803 804#define ext4_error_ratelimit(sb) \805 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \806 "EXT4-fs error")807 808void __ext4_error(struct super_block *sb, const char *function,809 unsigned int line, bool force_ro, int error, __u64 block,810 const char *fmt, ...)811{812 struct va_format vaf;813 va_list args;814 815 if (unlikely(ext4_forced_shutdown(sb)))816 return;817 818 trace_ext4_error(sb, function, line);819 if (ext4_error_ratelimit(sb)) {820 va_start(args, fmt);821 vaf.fmt = fmt;822 vaf.va = &args;823 printk(KERN_CRIT824 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",825 sb->s_id, function, line, current->comm, &vaf);826 va_end(args);827 }828 fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED);829 830 ext4_handle_error(sb, force_ro, error, 0, block, function, line);831}832 833void __ext4_error_inode(struct inode *inode, const char *function,834 unsigned int line, ext4_fsblk_t block, int error,835 const char *fmt, ...)836{837 va_list args;838 struct va_format vaf;839 840 if (unlikely(ext4_forced_shutdown(inode->i_sb)))841 return;842 843 trace_ext4_error(inode->i_sb, function, line);844 if (ext4_error_ratelimit(inode->i_sb)) {845 va_start(args, fmt);846 vaf.fmt = fmt;847 vaf.va = &args;848 if (block)849 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "850 "inode #%lu: block %llu: comm %s: %pV\n",851 inode->i_sb->s_id, function, line, inode->i_ino,852 block, current->comm, &vaf);853 else854 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "855 "inode #%lu: comm %s: %pV\n",856 inode->i_sb->s_id, function, line, inode->i_ino,857 current->comm, &vaf);858 va_end(args);859 }860 fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED);861 862 ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,863 function, line);864}865 866void __ext4_error_file(struct file *file, const char *function,867 unsigned int line, ext4_fsblk_t block,868 const char *fmt, ...)869{870 va_list args;871 struct va_format vaf;872 struct inode *inode = file_inode(file);873 char pathname[80], *path;874 875 if (unlikely(ext4_forced_shutdown(inode->i_sb)))876 return;877 878 trace_ext4_error(inode->i_sb, function, line);879 if (ext4_error_ratelimit(inode->i_sb)) {880 path = file_path(file, pathname, sizeof(pathname));881 if (IS_ERR(path))882 path = "(unknown)";883 va_start(args, fmt);884 vaf.fmt = fmt;885 vaf.va = &args;886 if (block)887 printk(KERN_CRIT888 "EXT4-fs error (device %s): %s:%d: inode #%lu: "889 "block %llu: comm %s: path %s: %pV\n",890 inode->i_sb->s_id, function, line, inode->i_ino,891 block, current->comm, path, &vaf);892 else893 printk(KERN_CRIT894 "EXT4-fs error (device %s): %s:%d: inode #%lu: "895 "comm %s: path %s: %pV\n",896 inode->i_sb->s_id, function, line, inode->i_ino,897 current->comm, path, &vaf);898 va_end(args);899 }900 fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED);901 902 ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,903 function, line);904}905 906const char *ext4_decode_error(struct super_block *sb, int errno,907 char nbuf[16])908{909 char *errstr = NULL;910 911 switch (errno) {912 case -EFSCORRUPTED:913 errstr = "Corrupt filesystem";914 break;915 case -EFSBADCRC:916 errstr = "Filesystem failed CRC";917 break;918 case -EIO:919 errstr = "IO failure";920 break;921 case -ENOMEM:922 errstr = "Out of memory";923 break;924 case -EROFS:925 if (!sb || (EXT4_SB(sb)->s_journal &&926 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))927 errstr = "Journal has aborted";928 else929 errstr = "Readonly filesystem";930 break;931 default:932 /* If the caller passed in an extra buffer for unknown933 * errors, textualise them now. Else we just return934 * NULL. */935 if (nbuf) {936 /* Check for truncated error codes... */937 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)938 errstr = nbuf;939 }940 break;941 }942 943 return errstr;944}945 946/* __ext4_std_error decodes expected errors from journaling functions947 * automatically and invokes the appropriate error response. */948 949void __ext4_std_error(struct super_block *sb, const char *function,950 unsigned int line, int errno)951{952 char nbuf[16];953 const char *errstr;954 955 if (unlikely(ext4_forced_shutdown(sb)))956 return;957 958 /* Special case: if the error is EROFS, and we're not already959 * inside a transaction, then there's really no point in logging960 * an error. */961 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))962 return;963 964 if (ext4_error_ratelimit(sb)) {965 errstr = ext4_decode_error(sb, errno, nbuf);966 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",967 sb->s_id, function, line, errstr);968 }969 fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED);970 971 ext4_handle_error(sb, false, -errno, 0, 0, function, line);972}973 974void __ext4_msg(struct super_block *sb,975 const char *prefix, const char *fmt, ...)976{977 struct va_format vaf;978 va_list args;979 980 if (sb) {981 atomic_inc(&EXT4_SB(sb)->s_msg_count);982 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state),983 "EXT4-fs"))984 return;985 }986 987 va_start(args, fmt);988 vaf.fmt = fmt;989 vaf.va = &args;990 if (sb)991 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);992 else993 printk("%sEXT4-fs: %pV\n", prefix, &vaf);994 va_end(args);995}996 997static int ext4_warning_ratelimit(struct super_block *sb)998{999 atomic_inc(&EXT4_SB(sb)->s_warning_count);1000 return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),1001 "EXT4-fs warning");1002}1003 1004void __ext4_warning(struct super_block *sb, const char *function,1005 unsigned int line, const char *fmt, ...)1006{1007 struct va_format vaf;1008 va_list args;1009 1010 if (!ext4_warning_ratelimit(sb))1011 return;1012 1013 va_start(args, fmt);1014 vaf.fmt = fmt;1015 vaf.va = &args;1016 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",1017 sb->s_id, function, line, &vaf);1018 va_end(args);1019}1020 1021void __ext4_warning_inode(const struct inode *inode, const char *function,1022 unsigned int line, const char *fmt, ...)1023{1024 struct va_format vaf;1025 va_list args;1026 1027 if (!ext4_warning_ratelimit(inode->i_sb))1028 return;1029 1030 va_start(args, fmt);1031 vaf.fmt = fmt;1032 vaf.va = &args;1033 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "1034 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,1035 function, line, inode->i_ino, current->comm, &vaf);1036 va_end(args);1037}1038 1039void __ext4_grp_locked_error(const char *function, unsigned int line,1040 struct super_block *sb, ext4_group_t grp,1041 unsigned long ino, ext4_fsblk_t block,1042 const char *fmt, ...)1043__releases(bitlock)1044__acquires(bitlock)1045{1046 struct va_format vaf;1047 va_list args;1048 1049 if (unlikely(ext4_forced_shutdown(sb)))1050 return;1051 1052 trace_ext4_error(sb, function, line);1053 if (ext4_error_ratelimit(sb)) {1054 va_start(args, fmt);1055 vaf.fmt = fmt;1056 vaf.va = &args;1057 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",1058 sb->s_id, function, line, grp);1059 if (ino)1060 printk(KERN_CONT "inode %lu: ", ino);1061 if (block)1062 printk(KERN_CONT "block %llu:",1063 (unsigned long long) block);1064 printk(KERN_CONT "%pV\n", &vaf);1065 va_end(args);1066 }1067 1068 if (test_opt(sb, ERRORS_CONT)) {1069 if (test_opt(sb, WARN_ON_ERROR))1070 WARN_ON_ONCE(1);1071 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;1072 if (!bdev_read_only(sb->s_bdev)) {1073 save_error_info(sb, EFSCORRUPTED, ino, block, function,1074 line);1075 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);1076 }1077 return;1078 }1079 ext4_unlock_group(sb, grp);1080 ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);1081 /*1082 * We only get here in the ERRORS_RO case; relocking the group1083 * may be dangerous, but nothing bad will happen since the1084 * filesystem will have already been marked read/only and the1085 * journal has been aborted. We return 1 as a hint to callers1086 * who might what to use the return value from1087 * ext4_grp_locked_error() to distinguish between the1088 * ERRORS_CONT and ERRORS_RO case, and perhaps return more1089 * aggressively from the ext4 function in question, with a1090 * more appropriate error code.1091 */1092 ext4_lock_group(sb, grp);1093 return;1094}1095 1096void ext4_mark_group_bitmap_corrupted(struct super_block *sb,1097 ext4_group_t group,1098 unsigned int flags)1099{1100 struct ext4_sb_info *sbi = EXT4_SB(sb);1101 struct ext4_group_info *grp = ext4_get_group_info(sb, group);1102 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);1103 int ret;1104 1105 if (!grp || !gdp)1106 return;1107 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {1108 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,1109 &grp->bb_state);1110 if (!ret)1111 percpu_counter_sub(&sbi->s_freeclusters_counter,1112 grp->bb_free);1113 }1114 1115 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {1116 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,1117 &grp->bb_state);1118 if (!ret && gdp) {1119 int count;1120 1121 count = ext4_free_inodes_count(sb, gdp);1122 percpu_counter_sub(&sbi->s_freeinodes_counter,1123 count);1124 }1125 }1126}1127 1128void ext4_update_dynamic_rev(struct super_block *sb)1129{1130 struct ext4_super_block *es = EXT4_SB(sb)->s_es;1131 1132 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)1133 return;1134 1135 ext4_warning(sb,1136 "updating to rev %d because of new feature flag, "1137 "running e2fsck is recommended",1138 EXT4_DYNAMIC_REV);1139 1140 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);1141 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);1142 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);1143 /* leave es->s_feature_*compat flags alone */1144 /* es->s_uuid will be set by e2fsck if empty */1145 1146 /*1147 * The rest of the superblock fields should be zero, and if not it1148 * means they are likely already in use, so leave them alone. We1149 * can leave it up to e2fsck to clean up any inconsistencies there.1150 */1151}1152 1153static inline struct inode *orphan_list_entry(struct list_head *l)1154{1155 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;1156}1157 1158static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)1159{1160 struct list_head *l;1161 1162 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",1163 le32_to_cpu(sbi->s_es->s_last_orphan));1164 1165 printk(KERN_ERR "sb_info orphan list:\n");1166 list_for_each(l, &sbi->s_orphan) {1167 struct inode *inode = orphan_list_entry(l);1168 printk(KERN_ERR " "1169 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",1170 inode->i_sb->s_id, inode->i_ino, inode,1171 inode->i_mode, inode->i_nlink,1172 NEXT_ORPHAN(inode));1173 }1174}1175 1176#ifdef CONFIG_QUOTA1177static int ext4_quota_off(struct super_block *sb, int type);1178 1179static inline void ext4_quotas_off(struct super_block *sb, int type)1180{1181 BUG_ON(type > EXT4_MAXQUOTAS);1182 1183 /* Use our quota_off function to clear inode flags etc. */1184 for (type--; type >= 0; type--)1185 ext4_quota_off(sb, type);1186}1187 1188/*1189 * This is a helper function which is used in the mount/remount1190 * codepaths (which holds s_umount) to fetch the quota file name.1191 */1192static inline char *get_qf_name(struct super_block *sb,1193 struct ext4_sb_info *sbi,1194 int type)1195{1196 return rcu_dereference_protected(sbi->s_qf_names[type],1197 lockdep_is_held(&sb->s_umount));1198}1199#else1200static inline void ext4_quotas_off(struct super_block *sb, int type)1201{1202}1203#endif1204 1205static int ext4_percpu_param_init(struct ext4_sb_info *sbi)1206{1207 ext4_fsblk_t block;1208 int err;1209 1210 block = ext4_count_free_clusters(sbi->s_sb);1211 ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block));1212 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,1213 GFP_KERNEL);1214 if (!err) {1215 unsigned long freei = ext4_count_free_inodes(sbi->s_sb);1216 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);1217 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,1218 GFP_KERNEL);1219 }1220 if (!err)1221 err = percpu_counter_init(&sbi->s_dirs_counter,1222 ext4_count_dirs(sbi->s_sb), GFP_KERNEL);1223 if (!err)1224 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,1225 GFP_KERNEL);1226 if (!err)1227 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,1228 GFP_KERNEL);1229 if (!err)1230 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);1231 1232 if (err)1233 ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory");1234 1235 return err;1236}1237 1238static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi)1239{1240 percpu_counter_destroy(&sbi->s_freeclusters_counter);1241 percpu_counter_destroy(&sbi->s_freeinodes_counter);1242 percpu_counter_destroy(&sbi->s_dirs_counter);1243 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);1244 percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);1245 percpu_free_rwsem(&sbi->s_writepages_rwsem);1246}1247 1248static void ext4_group_desc_free(struct ext4_sb_info *sbi)1249{1250 struct buffer_head **group_desc;1251 int i;1252 1253 rcu_read_lock();1254 group_desc = rcu_dereference(sbi->s_group_desc);1255 for (i = 0; i < sbi->s_gdb_count; i++)1256 brelse(group_desc[i]);1257 kvfree(group_desc);1258 rcu_read_unlock();1259}1260 1261static void ext4_flex_groups_free(struct ext4_sb_info *sbi)1262{1263 struct flex_groups **flex_groups;1264 int i;1265 1266 rcu_read_lock();1267 flex_groups = rcu_dereference(sbi->s_flex_groups);1268 if (flex_groups) {1269 for (i = 0; i < sbi->s_flex_groups_allocated; i++)1270 kvfree(flex_groups[i]);1271 kvfree(flex_groups);1272 }1273 rcu_read_unlock();1274}1275 1276static void ext4_put_super(struct super_block *sb)1277{1278 struct ext4_sb_info *sbi = EXT4_SB(sb);1279 struct ext4_super_block *es = sbi->s_es;1280 int aborted = 0;1281 int err;1282 1283 /*1284 * Unregister sysfs before destroying jbd2 journal.1285 * Since we could still access attr_journal_task attribute via sysfs1286 * path which could have sbi->s_journal->j_task as NULL1287 * Unregister sysfs before flush sbi->s_sb_upd_work.1288 * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If1289 * read metadata verify failed then will queue error work.1290 * update_super_work will call start_this_handle may trigger1291 * BUG_ON.1292 */1293 ext4_unregister_sysfs(sb);1294 1295 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))1296 ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.",1297 &sb->s_uuid);1298 1299 ext4_unregister_li_request(sb);1300 ext4_quotas_off(sb, EXT4_MAXQUOTAS);1301 1302 flush_work(&sbi->s_sb_upd_work);1303 destroy_workqueue(sbi->rsv_conversion_wq);1304 ext4_release_orphan_info(sb);1305 1306 if (sbi->s_journal) {1307 aborted = is_journal_aborted(sbi->s_journal);1308 err = jbd2_journal_destroy(sbi->s_journal);1309 sbi->s_journal = NULL;1310 if ((err < 0) && !aborted) {1311 ext4_abort(sb, -err, "Couldn't clean up the journal");1312 }1313 }1314 1315 ext4_es_unregister_shrinker(sbi);1316 timer_shutdown_sync(&sbi->s_err_report);1317 ext4_release_system_zone(sb);1318 ext4_mb_release(sb);1319 ext4_ext_release(sb);1320 1321 if (!sb_rdonly(sb) && !aborted) {1322 ext4_clear_feature_journal_needs_recovery(sb);1323 ext4_clear_feature_orphan_present(sb);1324 es->s_state = cpu_to_le16(sbi->s_mount_state);1325 }1326 if (!sb_rdonly(sb))1327 ext4_commit_super(sb);1328 1329 ext4_group_desc_free(sbi);1330 ext4_flex_groups_free(sbi);1331 1332 WARN_ON_ONCE(!(sbi->s_mount_state & EXT4_ERROR_FS) &&1333 percpu_counter_sum(&sbi->s_dirtyclusters_counter));1334 ext4_percpu_param_destroy(sbi);1335#ifdef CONFIG_QUOTA1336 for (int i = 0; i < EXT4_MAXQUOTAS; i++)1337 kfree(get_qf_name(sb, sbi, i));1338#endif1339 1340 /* Debugging code just in case the in-memory inode orphan list1341 * isn't empty. The on-disk one can be non-empty if we've1342 * detected an error and taken the fs readonly, but the1343 * in-memory list had better be clean by this point. */1344 if (!list_empty(&sbi->s_orphan))1345 dump_orphan_list(sb, sbi);1346 ASSERT(list_empty(&sbi->s_orphan));1347 1348 sync_blockdev(sb->s_bdev);1349 invalidate_bdev(sb->s_bdev);1350 if (sbi->s_journal_bdev_file) {1351 /*1352 * Invalidate the journal device's buffers. We don't want them1353 * floating about in memory - the physical journal device may1354 * hotswapped, and it breaks the `ro-after' testing code.1355 */1356 sync_blockdev(file_bdev(sbi->s_journal_bdev_file));1357 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file));1358 }1359 1360 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);1361 sbi->s_ea_inode_cache = NULL;1362 1363 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);1364 sbi->s_ea_block_cache = NULL;1365 1366 ext4_stop_mmpd(sbi);1367 1368 brelse(sbi->s_sbh);1369 sb->s_fs_info = NULL;1370 /*1371 * Now that we are completely done shutting down the1372 * superblock, we need to actually destroy the kobject.1373 */1374 kobject_put(&sbi->s_kobj);1375 wait_for_completion(&sbi->s_kobj_unregister);1376 if (sbi->s_chksum_driver)1377 crypto_free_shash(sbi->s_chksum_driver);1378 kfree(sbi->s_blockgroup_lock);1379 fs_put_dax(sbi->s_daxdev, NULL);1380 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);1381#if IS_ENABLED(CONFIG_UNICODE)1382 utf8_unload(sb->s_encoding);1383#endif1384 kfree(sbi);1385}1386 1387static struct kmem_cache *ext4_inode_cachep;1388 1389/*1390 * Called inside transaction, so use GFP_NOFS1391 */1392static struct inode *ext4_alloc_inode(struct super_block *sb)1393{1394 struct ext4_inode_info *ei;1395 1396 ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS);1397 if (!ei)1398 return NULL;1399 1400 inode_set_iversion(&ei->vfs_inode, 1);1401 ei->i_flags = 0;1402 spin_lock_init(&ei->i_raw_lock);1403 ei->i_prealloc_node = RB_ROOT;1404 atomic_set(&ei->i_prealloc_active, 0);1405 rwlock_init(&ei->i_prealloc_lock);1406 ext4_es_init_tree(&ei->i_es_tree);1407 rwlock_init(&ei->i_es_lock);1408 INIT_LIST_HEAD(&ei->i_es_list);1409 ei->i_es_all_nr = 0;1410 ei->i_es_shk_nr = 0;1411 ei->i_es_shrink_lblk = 0;1412 ei->i_reserved_data_blocks = 0;1413 spin_lock_init(&(ei->i_block_reservation_lock));1414 ext4_init_pending_tree(&ei->i_pending_tree);1415#ifdef CONFIG_QUOTA1416 ei->i_reserved_quota = 0;1417 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));1418#endif1419 ei->jinode = NULL;1420 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);1421 spin_lock_init(&ei->i_completed_io_lock);1422 ei->i_sync_tid = 0;1423 ei->i_datasync_tid = 0;1424 atomic_set(&ei->i_unwritten, 0);1425 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);1426 ext4_fc_init_inode(&ei->vfs_inode);1427 mutex_init(&ei->i_fc_lock);1428 return &ei->vfs_inode;1429}1430 1431static int ext4_drop_inode(struct inode *inode)1432{1433 int drop = generic_drop_inode(inode);1434 1435 if (!drop)1436 drop = fscrypt_drop_inode(inode);1437 1438 trace_ext4_drop_inode(inode, drop);1439 return drop;1440}1441 1442static void ext4_free_in_core_inode(struct inode *inode)1443{1444 fscrypt_free_inode(inode);1445 if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {1446 pr_warn("%s: inode %ld still in fc list",1447 __func__, inode->i_ino);1448 }1449 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));1450}1451 1452static void ext4_destroy_inode(struct inode *inode)1453{1454 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {1455 ext4_msg(inode->i_sb, KERN_ERR,1456 "Inode %lu (%p): orphan list check failed!",1457 inode->i_ino, EXT4_I(inode));1458 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,1459 EXT4_I(inode), sizeof(struct ext4_inode_info),1460 true);1461 dump_stack();1462 }1463 1464 if (!(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ERROR_FS) &&1465 WARN_ON_ONCE(EXT4_I(inode)->i_reserved_data_blocks))1466 ext4_msg(inode->i_sb, KERN_ERR,1467 "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",1468 inode->i_ino, EXT4_I(inode),1469 EXT4_I(inode)->i_reserved_data_blocks);1470}1471 1472static void ext4_shutdown(struct super_block *sb)1473{1474 ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH);1475}1476 1477static void init_once(void *foo)1478{1479 struct ext4_inode_info *ei = foo;1480 1481 INIT_LIST_HEAD(&ei->i_orphan);1482 init_rwsem(&ei->xattr_sem);1483 init_rwsem(&ei->i_data_sem);1484 inode_init_once(&ei->vfs_inode);1485 ext4_fc_init_inode(&ei->vfs_inode);1486}1487 1488static int __init init_inodecache(void)1489{1490 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",1491 sizeof(struct ext4_inode_info), 0,1492 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,1493 offsetof(struct ext4_inode_info, i_data),1494 sizeof_field(struct ext4_inode_info, i_data),1495 init_once);1496 if (ext4_inode_cachep == NULL)1497 return -ENOMEM;1498 return 0;1499}1500 1501static void destroy_inodecache(void)1502{1503 /*1504 * Make sure all delayed rcu free inodes are flushed before we1505 * destroy cache.1506 */1507 rcu_barrier();1508 kmem_cache_destroy(ext4_inode_cachep);1509}1510 1511void ext4_clear_inode(struct inode *inode)1512{1513 ext4_fc_del(inode);1514 invalidate_inode_buffers(inode);1515 clear_inode(inode);1516 ext4_discard_preallocations(inode);1517 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);1518 dquot_drop(inode);1519 if (EXT4_I(inode)->jinode) {1520 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),1521 EXT4_I(inode)->jinode);1522 jbd2_free_inode(EXT4_I(inode)->jinode);1523 EXT4_I(inode)->jinode = NULL;1524 }1525 fscrypt_put_encryption_info(inode);1526 fsverity_cleanup_inode(inode);1527}1528 1529static struct inode *ext4_nfs_get_inode(struct super_block *sb,1530 u64 ino, u32 generation)1531{1532 struct inode *inode;1533 1534 /*1535 * Currently we don't know the generation for parent directory, so1536 * a generation of 0 means "accept any"1537 */1538 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);1539 if (IS_ERR(inode))1540 return ERR_CAST(inode);1541 if (generation && inode->i_generation != generation) {1542 iput(inode);1543 return ERR_PTR(-ESTALE);1544 }1545 1546 return inode;1547}1548 1549static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,1550 int fh_len, int fh_type)1551{1552 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,1553 ext4_nfs_get_inode);1554}1555 1556static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,1557 int fh_len, int fh_type)1558{1559 return generic_fh_to_parent(sb, fid, fh_len, fh_type,1560 ext4_nfs_get_inode);1561}1562 1563static int ext4_nfs_commit_metadata(struct inode *inode)1564{1565 struct writeback_control wbc = {1566 .sync_mode = WB_SYNC_ALL1567 };1568 1569 trace_ext4_nfs_commit_metadata(inode);1570 return ext4_write_inode(inode, &wbc);1571}1572 1573#ifdef CONFIG_QUOTA1574static const char * const quotatypes[] = INITQFNAMES;1575#define QTYPE2NAME(t) (quotatypes[t])1576 1577static int ext4_write_dquot(struct dquot *dquot);1578static int ext4_acquire_dquot(struct dquot *dquot);1579static int ext4_release_dquot(struct dquot *dquot);1580static int ext4_mark_dquot_dirty(struct dquot *dquot);1581static int ext4_write_info(struct super_block *sb, int type);1582static int ext4_quota_on(struct super_block *sb, int type, int format_id,1583 const struct path *path);1584static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,1585 size_t len, loff_t off);1586static ssize_t ext4_quota_write(struct super_block *sb, int type,1587 const char *data, size_t len, loff_t off);1588static int ext4_quota_enable(struct super_block *sb, int type, int format_id,1589 unsigned int flags);1590 1591static struct dquot __rcu **ext4_get_dquots(struct inode *inode)1592{1593 return EXT4_I(inode)->i_dquot;1594}1595 1596static const struct dquot_operations ext4_quota_operations = {1597 .get_reserved_space = ext4_get_reserved_space,1598 .write_dquot = ext4_write_dquot,1599 .acquire_dquot = ext4_acquire_dquot,1600 .release_dquot = ext4_release_dquot,1601 .mark_dirty = ext4_mark_dquot_dirty,1602 .write_info = ext4_write_info,1603 .alloc_dquot = dquot_alloc,1604 .destroy_dquot = dquot_destroy,1605 .get_projid = ext4_get_projid,1606 .get_inode_usage = ext4_get_inode_usage,1607 .get_next_id = dquot_get_next_id,1608};1609 1610static const struct quotactl_ops ext4_qctl_operations = {1611 .quota_on = ext4_quota_on,1612 .quota_off = ext4_quota_off,1613 .quota_sync = dquot_quota_sync,1614 .get_state = dquot_get_state,1615 .set_info = dquot_set_dqinfo,1616 .get_dqblk = dquot_get_dqblk,1617 .set_dqblk = dquot_set_dqblk,1618 .get_nextdqblk = dquot_get_next_dqblk,1619};1620#endif1621 1622static const struct super_operations ext4_sops = {1623 .alloc_inode = ext4_alloc_inode,1624 .free_inode = ext4_free_in_core_inode,1625 .destroy_inode = ext4_destroy_inode,1626 .write_inode = ext4_write_inode,1627 .dirty_inode = ext4_dirty_inode,1628 .drop_inode = ext4_drop_inode,1629 .evict_inode = ext4_evict_inode,1630 .put_super = ext4_put_super,1631 .sync_fs = ext4_sync_fs,1632 .freeze_fs = ext4_freeze,1633 .unfreeze_fs = ext4_unfreeze,1634 .statfs = ext4_statfs,1635 .show_options = ext4_show_options,1636 .shutdown = ext4_shutdown,1637#ifdef CONFIG_QUOTA1638 .quota_read = ext4_quota_read,1639 .quota_write = ext4_quota_write,1640 .get_dquots = ext4_get_dquots,1641#endif1642};1643 1644static const struct export_operations ext4_export_ops = {1645 .encode_fh = generic_encode_ino32_fh,1646 .fh_to_dentry = ext4_fh_to_dentry,1647 .fh_to_parent = ext4_fh_to_parent,1648 .get_parent = ext4_get_parent,1649 .commit_metadata = ext4_nfs_commit_metadata,1650};1651 1652enum {1653 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,1654 Opt_resgid, Opt_resuid, Opt_sb,1655 Opt_nouid32, Opt_debug, Opt_removed,1656 Opt_user_xattr, Opt_acl,1657 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,1658 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,1659 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,1660 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,1661 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,1662 Opt_inlinecrypt,1663 Opt_usrjquota, Opt_grpjquota, Opt_quota,1664 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,1665 Opt_usrquota, Opt_grpquota, Opt_prjquota,1666 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,1667 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,1668 Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,1669 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,1670 Opt_inode_readahead_blks, Opt_journal_ioprio,1671 Opt_dioread_nolock, Opt_dioread_lock,1672 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,1673 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,1674 Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,1675 Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,1676#ifdef CONFIG_EXT4_DEBUG1677 Opt_fc_debug_max_replay, Opt_fc_debug_force1678#endif1679};1680 1681static const struct constant_table ext4_param_errors[] = {1682 {"continue", EXT4_MOUNT_ERRORS_CONT},1683 {"panic", EXT4_MOUNT_ERRORS_PANIC},1684 {"remount-ro", EXT4_MOUNT_ERRORS_RO},1685 {}1686};1687 1688static const struct constant_table ext4_param_data[] = {1689 {"journal", EXT4_MOUNT_JOURNAL_DATA},1690 {"ordered", EXT4_MOUNT_ORDERED_DATA},1691 {"writeback", EXT4_MOUNT_WRITEBACK_DATA},1692 {}1693};1694 1695static const struct constant_table ext4_param_data_err[] = {1696 {"abort", Opt_data_err_abort},1697 {"ignore", Opt_data_err_ignore},1698 {}1699};1700 1701static const struct constant_table ext4_param_jqfmt[] = {1702 {"vfsold", QFMT_VFS_OLD},1703 {"vfsv0", QFMT_VFS_V0},1704 {"vfsv1", QFMT_VFS_V1},1705 {}1706};1707 1708static const struct constant_table ext4_param_dax[] = {1709 {"always", Opt_dax_always},1710 {"inode", Opt_dax_inode},1711 {"never", Opt_dax_never},1712 {}1713};1714 1715/*1716 * Mount option specification1717 * We don't use fsparam_flag_no because of the way we set the1718 * options and the way we show them in _ext4_show_options(). To1719 * keep the changes to a minimum, let's keep the negative options1720 * separate for now.1721 */1722static const struct fs_parameter_spec ext4_param_specs[] = {1723 fsparam_flag ("bsddf", Opt_bsd_df),1724 fsparam_flag ("minixdf", Opt_minix_df),1725 fsparam_flag ("grpid", Opt_grpid),1726 fsparam_flag ("bsdgroups", Opt_grpid),1727 fsparam_flag ("nogrpid", Opt_nogrpid),1728 fsparam_flag ("sysvgroups", Opt_nogrpid),1729 fsparam_gid ("resgid", Opt_resgid),1730 fsparam_uid ("resuid", Opt_resuid),1731 fsparam_u32 ("sb", Opt_sb),1732 fsparam_enum ("errors", Opt_errors, ext4_param_errors),1733 fsparam_flag ("nouid32", Opt_nouid32),1734 fsparam_flag ("debug", Opt_debug),1735 fsparam_flag ("oldalloc", Opt_removed),1736 fsparam_flag ("orlov", Opt_removed),1737 fsparam_flag ("user_xattr", Opt_user_xattr),1738 fsparam_flag ("acl", Opt_acl),1739 fsparam_flag ("norecovery", Opt_noload),1740 fsparam_flag ("noload", Opt_noload),1741 fsparam_flag ("bh", Opt_removed),1742 fsparam_flag ("nobh", Opt_removed),1743 fsparam_u32 ("commit", Opt_commit),1744 fsparam_u32 ("min_batch_time", Opt_min_batch_time),1745 fsparam_u32 ("max_batch_time", Opt_max_batch_time),1746 fsparam_u32 ("journal_dev", Opt_journal_dev),1747 fsparam_bdev ("journal_path", Opt_journal_path),1748 fsparam_flag ("journal_checksum", Opt_journal_checksum),1749 fsparam_flag ("nojournal_checksum", Opt_nojournal_checksum),1750 fsparam_flag ("journal_async_commit",Opt_journal_async_commit),1751 fsparam_flag ("abort", Opt_abort),1752 fsparam_enum ("data", Opt_data, ext4_param_data),1753 fsparam_enum ("data_err", Opt_data_err,1754 ext4_param_data_err),1755 fsparam_string_empty1756 ("usrjquota", Opt_usrjquota),1757 fsparam_string_empty1758 ("grpjquota", Opt_grpjquota),1759 fsparam_enum ("jqfmt", Opt_jqfmt, ext4_param_jqfmt),1760 fsparam_flag ("grpquota", Opt_grpquota),1761 fsparam_flag ("quota", Opt_quota),1762 fsparam_flag ("noquota", Opt_noquota),1763 fsparam_flag ("usrquota", Opt_usrquota),1764 fsparam_flag ("prjquota", Opt_prjquota),1765 fsparam_flag ("barrier", Opt_barrier),1766 fsparam_u32 ("barrier", Opt_barrier),1767 fsparam_flag ("nobarrier", Opt_nobarrier),1768 fsparam_flag ("i_version", Opt_removed),1769 fsparam_flag ("dax", Opt_dax),1770 fsparam_enum ("dax", Opt_dax_type, ext4_param_dax),1771 fsparam_u32 ("stripe", Opt_stripe),1772 fsparam_flag ("delalloc", Opt_delalloc),1773 fsparam_flag ("nodelalloc", Opt_nodelalloc),1774 fsparam_flag ("warn_on_error", Opt_warn_on_error),1775 fsparam_flag ("nowarn_on_error", Opt_nowarn_on_error),1776 fsparam_u32 ("debug_want_extra_isize",1777 Opt_debug_want_extra_isize),1778 fsparam_flag ("mblk_io_submit", Opt_removed),1779 fsparam_flag ("nomblk_io_submit", Opt_removed),1780 fsparam_flag ("block_validity", Opt_block_validity),1781 fsparam_flag ("noblock_validity", Opt_noblock_validity),1782 fsparam_u32 ("inode_readahead_blks",1783 Opt_inode_readahead_blks),1784 fsparam_u32 ("journal_ioprio", Opt_journal_ioprio),1785 fsparam_u32 ("auto_da_alloc", Opt_auto_da_alloc),1786 fsparam_flag ("auto_da_alloc", Opt_auto_da_alloc),1787 fsparam_flag ("noauto_da_alloc", Opt_noauto_da_alloc),1788 fsparam_flag ("dioread_nolock", Opt_dioread_nolock),1789 fsparam_flag ("nodioread_nolock", Opt_dioread_lock),1790 fsparam_flag ("dioread_lock", Opt_dioread_lock),1791 fsparam_flag ("discard", Opt_discard),1792 fsparam_flag ("nodiscard", Opt_nodiscard),1793 fsparam_u32 ("init_itable", Opt_init_itable),1794 fsparam_flag ("init_itable", Opt_init_itable),1795 fsparam_flag ("noinit_itable", Opt_noinit_itable),1796#ifdef CONFIG_EXT4_DEBUG1797 fsparam_flag ("fc_debug_force", Opt_fc_debug_force),1798 fsparam_u32 ("fc_debug_max_replay", Opt_fc_debug_max_replay),1799#endif1800 fsparam_u32 ("max_dir_size_kb", Opt_max_dir_size_kb),1801 fsparam_flag ("test_dummy_encryption",1802 Opt_test_dummy_encryption),1803 fsparam_string ("test_dummy_encryption",1804 Opt_test_dummy_encryption),1805 fsparam_flag ("inlinecrypt", Opt_inlinecrypt),1806 fsparam_flag ("nombcache", Opt_nombcache),1807 fsparam_flag ("no_mbcache", Opt_nombcache), /* for backward compatibility */1808 fsparam_flag ("prefetch_block_bitmaps",1809 Opt_removed),1810 fsparam_flag ("no_prefetch_block_bitmaps",1811 Opt_no_prefetch_block_bitmaps),1812 fsparam_s32 ("mb_optimize_scan", Opt_mb_optimize_scan),1813 fsparam_string ("check", Opt_removed), /* mount option from ext2/3 */1814 fsparam_flag ("nocheck", Opt_removed), /* mount option from ext2/3 */1815 fsparam_flag ("reservation", Opt_removed), /* mount option from ext2/3 */1816 fsparam_flag ("noreservation", Opt_removed), /* mount option from ext2/3 */1817 fsparam_u32 ("journal", Opt_removed), /* mount option from ext2/3 */1818 {}1819};1820 1821#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))1822 1823#define MOPT_SET 0x00011824#define MOPT_CLEAR 0x00021825#define MOPT_NOSUPPORT 0x00041826#define MOPT_EXPLICIT 0x00081827#ifdef CONFIG_QUOTA1828#define MOPT_Q 01829#define MOPT_QFMT 0x00101830#else1831#define MOPT_Q MOPT_NOSUPPORT1832#define MOPT_QFMT MOPT_NOSUPPORT1833#endif1834#define MOPT_NO_EXT2 0x00201835#define MOPT_NO_EXT3 0x00401836#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)1837#define MOPT_SKIP 0x00801838#define MOPT_2 0x01001839 1840static const struct mount_opts {1841 int token;1842 int mount_opt;1843 int flags;1844} ext4_mount_opts[] = {1845 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},1846 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},1847 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},1848 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},1849 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},1850 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},1851 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,1852 MOPT_EXT4_ONLY | MOPT_SET},1853 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,1854 MOPT_EXT4_ONLY | MOPT_CLEAR},1855 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},1856 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},1857 {Opt_delalloc, EXT4_MOUNT_DELALLOC,1858 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},1859 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,1860 MOPT_EXT4_ONLY | MOPT_CLEAR},1861 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},1862 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},1863 {Opt_commit, 0, MOPT_NO_EXT2},1864 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,1865 MOPT_EXT4_ONLY | MOPT_CLEAR},1866 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,1867 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},1868 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |1869 EXT4_MOUNT_JOURNAL_CHECKSUM),1870 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},1871 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},1872 {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2},1873 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},1874 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},1875 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},1876 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},1877 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},1878 {Opt_dax_type, 0, MOPT_EXT4_ONLY},1879 {Opt_journal_dev, 0, MOPT_NO_EXT2},1880 {Opt_journal_path, 0, MOPT_NO_EXT2},1881 {Opt_journal_ioprio, 0, MOPT_NO_EXT2},1882 {Opt_data, 0, MOPT_NO_EXT2},1883 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},1884#ifdef CONFIG_EXT4_FS_POSIX_ACL1885 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},1886#else1887 {Opt_acl, 0, MOPT_NOSUPPORT},1888#endif1889 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},1890 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},1891 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},1892 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,1893 MOPT_SET | MOPT_Q},1894 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,1895 MOPT_SET | MOPT_Q},1896 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,1897 MOPT_SET | MOPT_Q},1898 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |1899 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),1900 MOPT_CLEAR | MOPT_Q},1901 {Opt_usrjquota, 0, MOPT_Q},1902 {Opt_grpjquota, 0, MOPT_Q},1903 {Opt_jqfmt, 0, MOPT_QFMT},1904 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},1905 {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,1906 MOPT_SET},1907#ifdef CONFIG_EXT4_DEBUG1908 {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,1909 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},1910#endif1911 {Opt_abort, EXT4_MOUNT2_ABORT, MOPT_SET | MOPT_2},1912 {Opt_err, 0, 0}1913};1914 1915#if IS_ENABLED(CONFIG_UNICODE)1916static const struct ext4_sb_encodings {1917 __u16 magic;1918 char *name;1919 unsigned int version;1920} ext4_sb_encoding_map[] = {1921 {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},1922};1923 1924static const struct ext4_sb_encodings *1925ext4_sb_read_encoding(const struct ext4_super_block *es)1926{1927 __u16 magic = le16_to_cpu(es->s_encoding);1928 int i;1929 1930 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)1931 if (magic == ext4_sb_encoding_map[i].magic)1932 return &ext4_sb_encoding_map[i];1933 1934 return NULL;1935}1936#endif1937 1938#define EXT4_SPEC_JQUOTA (1 << 0)1939#define EXT4_SPEC_JQFMT (1 << 1)1940#define EXT4_SPEC_DATAJ (1 << 2)1941#define EXT4_SPEC_SB_BLOCK (1 << 3)1942#define EXT4_SPEC_JOURNAL_DEV (1 << 4)1943#define EXT4_SPEC_JOURNAL_IOPRIO (1 << 5)1944#define EXT4_SPEC_s_want_extra_isize (1 << 7)1945#define EXT4_SPEC_s_max_batch_time (1 << 8)1946#define EXT4_SPEC_s_min_batch_time (1 << 9)1947#define EXT4_SPEC_s_inode_readahead_blks (1 << 10)1948#define EXT4_SPEC_s_li_wait_mult (1 << 11)1949#define EXT4_SPEC_s_max_dir_size_kb (1 << 12)1950#define EXT4_SPEC_s_stripe (1 << 13)1951#define EXT4_SPEC_s_resuid (1 << 14)1952#define EXT4_SPEC_s_resgid (1 << 15)1953#define EXT4_SPEC_s_commit_interval (1 << 16)1954#define EXT4_SPEC_s_fc_debug_max_replay (1 << 17)1955#define EXT4_SPEC_s_sb_block (1 << 18)1956#define EXT4_SPEC_mb_optimize_scan (1 << 19)1957 1958struct ext4_fs_context {1959 char *s_qf_names[EXT4_MAXQUOTAS];1960 struct fscrypt_dummy_policy dummy_enc_policy;1961 int s_jquota_fmt; /* Format of quota to use */1962#ifdef CONFIG_EXT4_DEBUG1963 int s_fc_debug_max_replay;1964#endif1965 unsigned short qname_spec;1966 unsigned long vals_s_flags; /* Bits to set in s_flags */1967 unsigned long mask_s_flags; /* Bits changed in s_flags */1968 unsigned long journal_devnum;1969 unsigned long s_commit_interval;1970 unsigned long s_stripe;1971 unsigned int s_inode_readahead_blks;1972 unsigned int s_want_extra_isize;1973 unsigned int s_li_wait_mult;1974 unsigned int s_max_dir_size_kb;1975 unsigned int journal_ioprio;1976 unsigned int vals_s_mount_opt;1977 unsigned int mask_s_mount_opt;1978 unsigned int vals_s_mount_opt2;1979 unsigned int mask_s_mount_opt2;1980 unsigned int opt_flags; /* MOPT flags */1981 unsigned int spec;1982 u32 s_max_batch_time;1983 u32 s_min_batch_time;1984 kuid_t s_resuid;1985 kgid_t s_resgid;1986 ext4_fsblk_t s_sb_block;1987};1988 1989static void ext4_fc_free(struct fs_context *fc)1990{1991 struct ext4_fs_context *ctx = fc->fs_private;1992 int i;1993 1994 if (!ctx)1995 return;1996 1997 for (i = 0; i < EXT4_MAXQUOTAS; i++)1998 kfree(ctx->s_qf_names[i]);1999 2000 fscrypt_free_dummy_policy(&ctx->dummy_enc_policy);2001 kfree(ctx);2002}2003 2004int ext4_init_fs_context(struct fs_context *fc)2005{2006 struct ext4_fs_context *ctx;2007 2008 ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);2009 if (!ctx)2010 return -ENOMEM;2011 2012 fc->fs_private = ctx;2013 fc->ops = &ext4_context_ops;2014 2015 return 0;2016}2017 2018#ifdef CONFIG_QUOTA2019/*2020 * Note the name of the specified quota file.2021 */2022static int note_qf_name(struct fs_context *fc, int qtype,2023 struct fs_parameter *param)2024{2025 struct ext4_fs_context *ctx = fc->fs_private;2026 char *qname;2027 2028 if (param->size < 1) {2029 ext4_msg(NULL, KERN_ERR, "Missing quota name");2030 return -EINVAL;2031 }2032 if (strchr(param->string, '/')) {2033 ext4_msg(NULL, KERN_ERR,2034 "quotafile must be on filesystem root");2035 return -EINVAL;2036 }2037 if (ctx->s_qf_names[qtype]) {2038 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) {2039 ext4_msg(NULL, KERN_ERR,2040 "%s quota file already specified",2041 QTYPE2NAME(qtype));2042 return -EINVAL;2043 }2044 return 0;2045 }2046 2047 qname = kmemdup_nul(param->string, param->size, GFP_KERNEL);2048 if (!qname) {2049 ext4_msg(NULL, KERN_ERR,2050 "Not enough memory for storing quotafile name");2051 return -ENOMEM;2052 }2053 ctx->s_qf_names[qtype] = qname;2054 ctx->qname_spec |= 1 << qtype;2055 ctx->spec |= EXT4_SPEC_JQUOTA;2056 return 0;2057}2058 2059/*2060 * Clear the name of the specified quota file.2061 */2062static int unnote_qf_name(struct fs_context *fc, int qtype)2063{2064 struct ext4_fs_context *ctx = fc->fs_private;2065 2066 kfree(ctx->s_qf_names[qtype]);2067 2068 ctx->s_qf_names[qtype] = NULL;2069 ctx->qname_spec |= 1 << qtype;2070 ctx->spec |= EXT4_SPEC_JQUOTA;2071 return 0;2072}2073#endif2074 2075static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param,2076 struct ext4_fs_context *ctx)2077{2078 int err;2079 2080 if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {2081 ext4_msg(NULL, KERN_WARNING,2082 "test_dummy_encryption option not supported");2083 return -EINVAL;2084 }2085 err = fscrypt_parse_test_dummy_encryption(param,2086 &ctx->dummy_enc_policy);2087 if (err == -EINVAL) {2088 ext4_msg(NULL, KERN_WARNING,2089 "Value of option \"%s\" is unrecognized", param->key);2090 } else if (err == -EEXIST) {2091 ext4_msg(NULL, KERN_WARNING,2092 "Conflicting test_dummy_encryption options");2093 return -EINVAL;2094 }2095 return err;2096}2097 2098#define EXT4_SET_CTX(name) \2099static inline void ctx_set_##name(struct ext4_fs_context *ctx, \2100 unsigned long flag) \2101{ \2102 ctx->mask_s_##name |= flag; \2103 ctx->vals_s_##name |= flag; \2104}2105 2106#define EXT4_CLEAR_CTX(name) \2107static inline void ctx_clear_##name(struct ext4_fs_context *ctx, \2108 unsigned long flag) \2109{ \2110 ctx->mask_s_##name |= flag; \2111 ctx->vals_s_##name &= ~flag; \2112}2113 2114#define EXT4_TEST_CTX(name) \2115static inline unsigned long \2116ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \2117{ \2118 return (ctx->vals_s_##name & flag); \2119}2120 2121EXT4_SET_CTX(flags); /* set only */2122EXT4_SET_CTX(mount_opt);2123EXT4_CLEAR_CTX(mount_opt);2124EXT4_TEST_CTX(mount_opt);2125EXT4_SET_CTX(mount_opt2);2126EXT4_CLEAR_CTX(mount_opt2);2127EXT4_TEST_CTX(mount_opt2);2128 2129static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)2130{2131 struct ext4_fs_context *ctx = fc->fs_private;2132 struct fs_parse_result result;2133 const struct mount_opts *m;2134 int is_remount;2135 int token;2136 2137 token = fs_parse(fc, ext4_param_specs, param, &result);2138 if (token < 0)2139 return token;2140 is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;2141 2142 for (m = ext4_mount_opts; m->token != Opt_err; m++)2143 if (token == m->token)2144 break;2145 2146 ctx->opt_flags |= m->flags;2147 2148 if (m->flags & MOPT_EXPLICIT) {2149 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {2150 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC);2151 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {2152 ctx_set_mount_opt2(ctx,2153 EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM);2154 } else2155 return -EINVAL;2156 }2157 2158 if (m->flags & MOPT_NOSUPPORT) {2159 ext4_msg(NULL, KERN_ERR, "%s option not supported",2160 param->key);2161 return 0;2162 }2163 2164 switch (token) {2165#ifdef CONFIG_QUOTA2166 case Opt_usrjquota:2167 if (!*param->string)2168 return unnote_qf_name(fc, USRQUOTA);2169 else2170 return note_qf_name(fc, USRQUOTA, param);2171 case Opt_grpjquota:2172 if (!*param->string)2173 return unnote_qf_name(fc, GRPQUOTA);2174 else2175 return note_qf_name(fc, GRPQUOTA, param);2176#endif2177 case Opt_sb:2178 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {2179 ext4_msg(NULL, KERN_WARNING,2180 "Ignoring %s option on remount", param->key);2181 } else {2182 ctx->s_sb_block = result.uint_32;2183 ctx->spec |= EXT4_SPEC_s_sb_block;2184 }2185 return 0;2186 case Opt_removed:2187 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",2188 param->key);2189 return 0;2190 case Opt_inlinecrypt:2191#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT2192 ctx_set_flags(ctx, SB_INLINECRYPT);2193#else2194 ext4_msg(NULL, KERN_ERR, "inline encryption not supported");2195#endif2196 return 0;2197 case Opt_errors:2198 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK);2199 ctx_set_mount_opt(ctx, result.uint_32);2200 return 0;2201#ifdef CONFIG_QUOTA2202 case Opt_jqfmt:2203 ctx->s_jquota_fmt = result.uint_32;2204 ctx->spec |= EXT4_SPEC_JQFMT;2205 return 0;2206#endif2207 case Opt_data:2208 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);2209 ctx_set_mount_opt(ctx, result.uint_32);2210 ctx->spec |= EXT4_SPEC_DATAJ;2211 return 0;2212 case Opt_commit:2213 if (result.uint_32 == 0)2214 result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE;2215 else if (result.uint_32 > INT_MAX / HZ) {2216 ext4_msg(NULL, KERN_ERR,2217 "Invalid commit interval %d, "2218 "must be smaller than %d",2219 result.uint_32, INT_MAX / HZ);2220 return -EINVAL;2221 }2222 ctx->s_commit_interval = HZ * result.uint_32;2223 ctx->spec |= EXT4_SPEC_s_commit_interval;2224 return 0;2225 case Opt_debug_want_extra_isize:2226 if ((result.uint_32 & 1) || (result.uint_32 < 4)) {2227 ext4_msg(NULL, KERN_ERR,2228 "Invalid want_extra_isize %d", result.uint_32);2229 return -EINVAL;2230 }2231 ctx->s_want_extra_isize = result.uint_32;2232 ctx->spec |= EXT4_SPEC_s_want_extra_isize;2233 return 0;2234 case Opt_max_batch_time:2235 ctx->s_max_batch_time = result.uint_32;2236 ctx->spec |= EXT4_SPEC_s_max_batch_time;2237 return 0;2238 case Opt_min_batch_time:2239 ctx->s_min_batch_time = result.uint_32;2240 ctx->spec |= EXT4_SPEC_s_min_batch_time;2241 return 0;2242 case Opt_inode_readahead_blks:2243 if (result.uint_32 &&2244 (result.uint_32 > (1 << 30) ||2245 !is_power_of_2(result.uint_32))) {2246 ext4_msg(NULL, KERN_ERR,2247 "EXT4-fs: inode_readahead_blks must be "2248 "0 or a power of 2 smaller than 2^31");2249 return -EINVAL;2250 }2251 ctx->s_inode_readahead_blks = result.uint_32;2252 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks;2253 return 0;2254 case Opt_init_itable:2255 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE);2256 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;2257 if (param->type == fs_value_is_string)2258 ctx->s_li_wait_mult = result.uint_32;2259 ctx->spec |= EXT4_SPEC_s_li_wait_mult;2260 return 0;2261 case Opt_max_dir_size_kb:2262 ctx->s_max_dir_size_kb = result.uint_32;2263 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb;2264 return 0;2265#ifdef CONFIG_EXT4_DEBUG2266 case Opt_fc_debug_max_replay:2267 ctx->s_fc_debug_max_replay = result.uint_32;2268 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay;2269 return 0;2270#endif2271 case Opt_stripe:2272 ctx->s_stripe = result.uint_32;2273 ctx->spec |= EXT4_SPEC_s_stripe;2274 return 0;2275 case Opt_resuid:2276 ctx->s_resuid = result.uid;2277 ctx->spec |= EXT4_SPEC_s_resuid;2278 return 0;2279 case Opt_resgid:2280 ctx->s_resgid = result.gid;2281 ctx->spec |= EXT4_SPEC_s_resgid;2282 return 0;2283 case Opt_journal_dev:2284 if (is_remount) {2285 ext4_msg(NULL, KERN_ERR,2286 "Cannot specify journal on remount");2287 return -EINVAL;2288 }2289 ctx->journal_devnum = result.uint_32;2290 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;2291 return 0;2292 case Opt_journal_path:2293 {2294 struct inode *journal_inode;2295 struct path path;2296 int error;2297 2298 if (is_remount) {2299 ext4_msg(NULL, KERN_ERR,2300 "Cannot specify journal on remount");2301 return -EINVAL;2302 }2303 2304 error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path);2305 if (error) {2306 ext4_msg(NULL, KERN_ERR, "error: could not find "2307 "journal device path");2308 return -EINVAL;2309 }2310 2311 journal_inode = d_inode(path.dentry);2312 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev);2313 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;2314 path_put(&path);2315 return 0;2316 }2317 case Opt_journal_ioprio:2318 if (result.uint_32 > 7) {2319 ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority"2320 " (must be 0-7)");2321 return -EINVAL;2322 }2323 ctx->journal_ioprio =2324 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32);2325 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO;2326 return 0;2327 case Opt_test_dummy_encryption:2328 return ext4_parse_test_dummy_encryption(param, ctx);2329 case Opt_dax:2330 case Opt_dax_type:2331#ifdef CONFIG_FS_DAX2332 {2333 int type = (token == Opt_dax) ?2334 Opt_dax : result.uint_32;2335 2336 switch (type) {2337 case Opt_dax:2338 case Opt_dax_always:2339 ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);2340 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);2341 break;2342 case Opt_dax_never:2343 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);2344 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);2345 break;2346 case Opt_dax_inode:2347 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);2348 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);2349 /* Strictly for printing options */2350 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);2351 break;2352 }2353 return 0;2354 }2355#else2356 ext4_msg(NULL, KERN_INFO, "dax option not supported");2357 return -EINVAL;2358#endif2359 case Opt_data_err:2360 if (result.uint_32 == Opt_data_err_abort)2361 ctx_set_mount_opt(ctx, m->mount_opt);2362 else if (result.uint_32 == Opt_data_err_ignore)2363 ctx_clear_mount_opt(ctx, m->mount_opt);2364 return 0;2365 case Opt_mb_optimize_scan:2366 if (result.int_32 == 1) {2367 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);2368 ctx->spec |= EXT4_SPEC_mb_optimize_scan;2369 } else if (result.int_32 == 0) {2370 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);2371 ctx->spec |= EXT4_SPEC_mb_optimize_scan;2372 } else {2373 ext4_msg(NULL, KERN_WARNING,2374 "mb_optimize_scan should be set to 0 or 1.");2375 return -EINVAL;2376 }2377 return 0;2378 }2379 2380 /*2381 * At this point we should only be getting options requiring MOPT_SET,2382 * or MOPT_CLEAR. Anything else is a bug2383 */2384 if (m->token == Opt_err) {2385 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s",2386 param->key);2387 WARN_ON(1);2388 return -EINVAL;2389 }2390 2391 else {2392 unsigned int set = 0;2393 2394 if ((param->type == fs_value_is_flag) ||2395 result.uint_32 > 0)2396 set = 1;2397 2398 if (m->flags & MOPT_CLEAR)2399 set = !set;2400 else if (unlikely(!(m->flags & MOPT_SET))) {2401 ext4_msg(NULL, KERN_WARNING,2402 "buggy handling of option %s",2403 param->key);2404 WARN_ON(1);2405 return -EINVAL;2406 }2407 if (m->flags & MOPT_2) {2408 if (set != 0)2409 ctx_set_mount_opt2(ctx, m->mount_opt);2410 else2411 ctx_clear_mount_opt2(ctx, m->mount_opt);2412 } else {2413 if (set != 0)2414 ctx_set_mount_opt(ctx, m->mount_opt);2415 else2416 ctx_clear_mount_opt(ctx, m->mount_opt);2417 }2418 }2419 2420 return 0;2421}2422 2423static int parse_options(struct fs_context *fc, char *options)2424{2425 struct fs_parameter param;2426 int ret;2427 char *key;2428 2429 if (!options)2430 return 0;2431 2432 while ((key = strsep(&options, ",")) != NULL) {2433 if (*key) {2434 size_t v_len = 0;2435 char *value = strchr(key, '=');2436 2437 param.type = fs_value_is_flag;2438 param.string = NULL;2439 2440 if (value) {2441 if (value == key)2442 continue;2443 2444 *value++ = 0;2445 v_len = strlen(value);2446 param.string = kmemdup_nul(value, v_len,2447 GFP_KERNEL);2448 if (!param.string)2449 return -ENOMEM;2450 param.type = fs_value_is_string;2451 }2452 2453 param.key = key;2454 param.size = v_len;2455 2456 ret = ext4_parse_param(fc, ¶m);2457 kfree(param.string);2458 if (ret < 0)2459 return ret;2460 }2461 }2462 2463 ret = ext4_validate_options(fc);2464 if (ret < 0)2465 return ret;2466 2467 return 0;2468}2469 2470static int parse_apply_sb_mount_options(struct super_block *sb,2471 struct ext4_fs_context *m_ctx)2472{2473 struct ext4_sb_info *sbi = EXT4_SB(sb);2474 char *s_mount_opts = NULL;2475 struct ext4_fs_context *s_ctx = NULL;2476 struct fs_context *fc = NULL;2477 int ret = -ENOMEM;2478 2479 if (!sbi->s_es->s_mount_opts[0])2480 return 0;2481 2482 s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,2483 sizeof(sbi->s_es->s_mount_opts),2484 GFP_KERNEL);2485 if (!s_mount_opts)2486 return ret;2487 2488 fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);2489 if (!fc)2490 goto out_free;2491 2492 s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);2493 if (!s_ctx)2494 goto out_free;2495 2496 fc->fs_private = s_ctx;2497 fc->s_fs_info = sbi;2498 2499 ret = parse_options(fc, s_mount_opts);2500 if (ret < 0)2501 goto parse_failed;2502 2503 ret = ext4_check_opt_consistency(fc, sb);2504 if (ret < 0) {2505parse_failed:2506 ext4_msg(sb, KERN_WARNING,2507 "failed to parse options in superblock: %s",2508 s_mount_opts);2509 ret = 0;2510 goto out_free;2511 }2512 2513 if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV)2514 m_ctx->journal_devnum = s_ctx->journal_devnum;2515 if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)2516 m_ctx->journal_ioprio = s_ctx->journal_ioprio;2517 2518 ext4_apply_options(fc, sb);2519 ret = 0;2520 2521out_free:2522 if (fc) {2523 ext4_fc_free(fc);2524 kfree(fc);2525 }2526 kfree(s_mount_opts);2527 return ret;2528}2529 2530static void ext4_apply_quota_options(struct fs_context *fc,2531 struct super_block *sb)2532{2533#ifdef CONFIG_QUOTA2534 bool quota_feature = ext4_has_feature_quota(sb);2535 struct ext4_fs_context *ctx = fc->fs_private;2536 struct ext4_sb_info *sbi = EXT4_SB(sb);2537 char *qname;2538 int i;2539 2540 if (quota_feature)2541 return;2542 2543 if (ctx->spec & EXT4_SPEC_JQUOTA) {2544 for (i = 0; i < EXT4_MAXQUOTAS; i++) {2545 if (!(ctx->qname_spec & (1 << i)))2546 continue;2547 2548 qname = ctx->s_qf_names[i]; /* May be NULL */2549 if (qname)2550 set_opt(sb, QUOTA);2551 ctx->s_qf_names[i] = NULL;2552 qname = rcu_replace_pointer(sbi->s_qf_names[i], qname,2553 lockdep_is_held(&sb->s_umount));2554 if (qname)2555 kfree_rcu_mightsleep(qname);2556 }2557 }2558 2559 if (ctx->spec & EXT4_SPEC_JQFMT)2560 sbi->s_jquota_fmt = ctx->s_jquota_fmt;2561#endif2562}2563 2564/*2565 * Check quota settings consistency.2566 */2567static int ext4_check_quota_consistency(struct fs_context *fc,2568 struct super_block *sb)2569{2570#ifdef CONFIG_QUOTA2571 struct ext4_fs_context *ctx = fc->fs_private;2572 struct ext4_sb_info *sbi = EXT4_SB(sb);2573 bool quota_feature = ext4_has_feature_quota(sb);2574 bool quota_loaded = sb_any_quota_loaded(sb);2575 bool usr_qf_name, grp_qf_name, usrquota, grpquota;2576 int quota_flags, i;2577 2578 /*2579 * We do the test below only for project quotas. 'usrquota' and2580 * 'grpquota' mount options are allowed even without quota feature2581 * to support legacy quotas in quota files.2582 */2583 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) &&2584 !ext4_has_feature_project(sb)) {2585 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. "2586 "Cannot enable project quota enforcement.");2587 return -EINVAL;2588 }2589 2590 quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |2591 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA;2592 if (quota_loaded &&2593 ctx->mask_s_mount_opt & quota_flags &&2594 !ctx_test_mount_opt(ctx, quota_flags))2595 goto err_quota_change;2596 2597 if (ctx->spec & EXT4_SPEC_JQUOTA) {2598 2599 for (i = 0; i < EXT4_MAXQUOTAS; i++) {2600 if (!(ctx->qname_spec & (1 << i)))2601 continue;2602 2603 if (quota_loaded &&2604 !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i])2605 goto err_jquota_change;2606 2607 if (sbi->s_qf_names[i] && ctx->s_qf_names[i] &&2608 strcmp(get_qf_name(sb, sbi, i),2609 ctx->s_qf_names[i]) != 0)2610 goto err_jquota_specified;2611 }2612 2613 if (quota_feature) {2614 ext4_msg(NULL, KERN_INFO,2615 "Journaled quota options ignored when "2616 "QUOTA feature is enabled");2617 return 0;2618 }2619 }2620 2621 if (ctx->spec & EXT4_SPEC_JQFMT) {2622 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded)2623 goto err_jquota_change;2624 if (quota_feature) {2625 ext4_msg(NULL, KERN_INFO, "Quota format mount options "2626 "ignored when QUOTA feature is enabled");2627 return 0;2628 }2629 }2630 2631 /* Make sure we don't mix old and new quota format */2632 usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) ||2633 ctx->s_qf_names[USRQUOTA]);2634 grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) ||2635 ctx->s_qf_names[GRPQUOTA]);2636 2637 usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||2638 test_opt(sb, USRQUOTA));2639 2640 grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) ||2641 test_opt(sb, GRPQUOTA));2642 2643 if (usr_qf_name) {2644 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);2645 usrquota = false;2646 }2647 if (grp_qf_name) {2648 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);2649 grpquota = false;2650 }2651 2652 if (usr_qf_name || grp_qf_name) {2653 if (usrquota || grpquota) {2654 ext4_msg(NULL, KERN_ERR, "old and new quota "2655 "format mixing");2656 return -EINVAL;2657 }2658 2659 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) {2660 ext4_msg(NULL, KERN_ERR, "journaled quota format "2661 "not specified");2662 return -EINVAL;2663 }2664 }2665 2666 return 0;2667 2668err_quota_change:2669 ext4_msg(NULL, KERN_ERR,2670 "Cannot change quota options when quota turned on");2671 return -EINVAL;2672err_jquota_change:2673 ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota "2674 "options when quota turned on");2675 return -EINVAL;2676err_jquota_specified:2677 ext4_msg(NULL, KERN_ERR, "%s quota file already specified",2678 QTYPE2NAME(i));2679 return -EINVAL;2680#else2681 return 0;2682#endif2683}2684 2685static int ext4_check_test_dummy_encryption(const struct fs_context *fc,2686 struct super_block *sb)2687{2688 const struct ext4_fs_context *ctx = fc->fs_private;2689 const struct ext4_sb_info *sbi = EXT4_SB(sb);2690 2691 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy))2692 return 0;2693 2694 if (!ext4_has_feature_encrypt(sb)) {2695 ext4_msg(NULL, KERN_WARNING,2696 "test_dummy_encryption requires encrypt feature");2697 return -EINVAL;2698 }2699 /*2700 * This mount option is just for testing, and it's not worthwhile to2701 * implement the extra complexity (e.g. RCU protection) that would be2702 * needed to allow it to be set or changed during remount. We do allow2703 * it to be specified during remount, but only if there is no change.2704 */2705 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {2706 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,2707 &ctx->dummy_enc_policy))2708 return 0;2709 ext4_msg(NULL, KERN_WARNING,2710 "Can't set or change test_dummy_encryption on remount");2711 return -EINVAL;2712 }2713 /* Also make sure s_mount_opts didn't contain a conflicting value. */2714 if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) {2715 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,2716 &ctx->dummy_enc_policy))2717 return 0;2718 ext4_msg(NULL, KERN_WARNING,2719 "Conflicting test_dummy_encryption options");2720 return -EINVAL;2721 }2722 return 0;2723}2724 2725static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx,2726 struct super_block *sb)2727{2728 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) ||2729 /* if already set, it was already verified to be the same */2730 fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy))2731 return;2732 EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy;2733 memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy));2734 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");2735}2736 2737static int ext4_check_opt_consistency(struct fs_context *fc,2738 struct super_block *sb)2739{2740 struct ext4_fs_context *ctx = fc->fs_private;2741 struct ext4_sb_info *sbi = fc->s_fs_info;2742 int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;2743 int err;2744 2745 if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {2746 ext4_msg(NULL, KERN_ERR,2747 "Mount option(s) incompatible with ext2");2748 return -EINVAL;2749 }2750 if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {2751 ext4_msg(NULL, KERN_ERR,2752 "Mount option(s) incompatible with ext3");2753 return -EINVAL;2754 }2755 2756 if (ctx->s_want_extra_isize >2757 (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) {2758 ext4_msg(NULL, KERN_ERR,2759 "Invalid want_extra_isize %d",2760 ctx->s_want_extra_isize);2761 return -EINVAL;2762 }2763 2764 err = ext4_check_test_dummy_encryption(fc, sb);2765 if (err)2766 return err;2767 2768 if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) {2769 if (!sbi->s_journal) {2770 ext4_msg(NULL, KERN_WARNING,2771 "Remounting file system with no journal "2772 "so ignoring journalled data option");2773 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);2774 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) !=2775 test_opt(sb, DATA_FLAGS)) {2776 ext4_msg(NULL, KERN_ERR, "Cannot change data mode "2777 "on remount");2778 return -EINVAL;2779 }2780 }2781 2782 if (is_remount) {2783 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&2784 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {2785 ext4_msg(NULL, KERN_ERR, "can't mount with "2786 "both data=journal and dax");2787 return -EINVAL;2788 }2789 2790 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&2791 (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||2792 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {2793fail_dax_change_remount:2794 ext4_msg(NULL, KERN_ERR, "can't change "2795 "dax mount option while remounting");2796 return -EINVAL;2797 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) &&2798 (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||2799 (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) {2800 goto fail_dax_change_remount;2801 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) &&2802 ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||2803 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||2804 !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {2805 goto fail_dax_change_remount;2806 }2807 }2808 2809 return ext4_check_quota_consistency(fc, sb);2810}2811 2812static void ext4_apply_options(struct fs_context *fc, struct super_block *sb)2813{2814 struct ext4_fs_context *ctx = fc->fs_private;2815 struct ext4_sb_info *sbi = fc->s_fs_info;2816 2817 sbi->s_mount_opt &= ~ctx->mask_s_mount_opt;2818 sbi->s_mount_opt |= ctx->vals_s_mount_opt;2819 sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2;2820 sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2;2821 sb->s_flags &= ~ctx->mask_s_flags;2822 sb->s_flags |= ctx->vals_s_flags;2823 2824#define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; })2825 APPLY(s_commit_interval);2826 APPLY(s_stripe);2827 APPLY(s_max_batch_time);2828 APPLY(s_min_batch_time);2829 APPLY(s_want_extra_isize);2830 APPLY(s_inode_readahead_blks);2831 APPLY(s_max_dir_size_kb);2832 APPLY(s_li_wait_mult);2833 APPLY(s_resgid);2834 APPLY(s_resuid);2835 2836#ifdef CONFIG_EXT4_DEBUG2837 APPLY(s_fc_debug_max_replay);2838#endif2839 2840 ext4_apply_quota_options(fc, sb);2841 ext4_apply_test_dummy_encryption(ctx, sb);2842}2843 2844 2845static int ext4_validate_options(struct fs_context *fc)2846{2847#ifdef CONFIG_QUOTA2848 struct ext4_fs_context *ctx = fc->fs_private;2849 char *usr_qf_name, *grp_qf_name;2850 2851 usr_qf_name = ctx->s_qf_names[USRQUOTA];2852 grp_qf_name = ctx->s_qf_names[GRPQUOTA];2853 2854 if (usr_qf_name || grp_qf_name) {2855 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name)2856 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);2857 2858 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name)2859 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);2860 2861 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||2862 ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) {2863 ext4_msg(NULL, KERN_ERR, "old and new quota "2864 "format mixing");2865 return -EINVAL;2866 }2867 }2868#endif2869 return 1;2870}2871 2872static inline void ext4_show_quota_options(struct seq_file *seq,2873 struct super_block *sb)2874{2875#if defined(CONFIG_QUOTA)2876 struct ext4_sb_info *sbi = EXT4_SB(sb);2877 char *usr_qf_name, *grp_qf_name;2878 2879 if (sbi->s_jquota_fmt) {2880 char *fmtname = "";2881 2882 switch (sbi->s_jquota_fmt) {2883 case QFMT_VFS_OLD:2884 fmtname = "vfsold";2885 break;2886 case QFMT_VFS_V0:2887 fmtname = "vfsv0";2888 break;2889 case QFMT_VFS_V1:2890 fmtname = "vfsv1";2891 break;2892 }2893 seq_printf(seq, ",jqfmt=%s", fmtname);2894 }2895 2896 rcu_read_lock();2897 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);2898 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);2899 if (usr_qf_name)2900 seq_show_option(seq, "usrjquota", usr_qf_name);2901 if (grp_qf_name)2902 seq_show_option(seq, "grpjquota", grp_qf_name);2903 rcu_read_unlock();2904#endif2905}2906 2907static const char *token2str(int token)2908{2909 const struct fs_parameter_spec *spec;2910 2911 for (spec = ext4_param_specs; spec->name != NULL; spec++)2912 if (spec->opt == token && !spec->type)2913 break;2914 return spec->name;2915}2916 2917/*2918 * Show an option if2919 * - it's set to a non-default value OR2920 * - if the per-sb default is different from the global default2921 */2922static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,2923 int nodefs)2924{2925 struct ext4_sb_info *sbi = EXT4_SB(sb);2926 struct ext4_super_block *es = sbi->s_es;2927 int def_errors;2928 const struct mount_opts *m;2929 char sep = nodefs ? '\n' : ',';2930 2931#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)2932#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)2933 2934 if (sbi->s_sb_block != 1)2935 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);2936 2937 for (m = ext4_mount_opts; m->token != Opt_err; m++) {2938 int want_set = m->flags & MOPT_SET;2939 int opt_2 = m->flags & MOPT_2;2940 unsigned int mount_opt, def_mount_opt;2941 2942 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||2943 m->flags & MOPT_SKIP)2944 continue;2945 2946 if (opt_2) {2947 mount_opt = sbi->s_mount_opt2;2948 def_mount_opt = sbi->s_def_mount_opt2;2949 } else {2950 mount_opt = sbi->s_mount_opt;2951 def_mount_opt = sbi->s_def_mount_opt;2952 }2953 /* skip if same as the default */2954 if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt)))2955 continue;2956 /* select Opt_noFoo vs Opt_Foo */2957 if ((want_set &&2958 (mount_opt & m->mount_opt) != m->mount_opt) ||2959 (!want_set && (mount_opt & m->mount_opt)))2960 continue;2961 SEQ_OPTS_PRINT("%s", token2str(m->token));2962 }2963 2964 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||2965 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)2966 SEQ_OPTS_PRINT("resuid=%u",2967 from_kuid_munged(&init_user_ns, sbi->s_resuid));2968 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||2969 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)2970 SEQ_OPTS_PRINT("resgid=%u",2971 from_kgid_munged(&init_user_ns, sbi->s_resgid));2972 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);2973 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)2974 SEQ_OPTS_PUTS("errors=remount-ro");2975 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)2976 SEQ_OPTS_PUTS("errors=continue");2977 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)2978 SEQ_OPTS_PUTS("errors=panic");2979 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)2980 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);2981 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)2982 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);2983 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)2984 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);2985 if (nodefs || sbi->s_stripe)2986 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);2987 if (nodefs || EXT4_MOUNT_DATA_FLAGS &2988 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {2989 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)2990 SEQ_OPTS_PUTS("data=journal");2991 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)2992 SEQ_OPTS_PUTS("data=ordered");2993 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)2994 SEQ_OPTS_PUTS("data=writeback");2995 }2996 if (nodefs ||2997 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)2998 SEQ_OPTS_PRINT("inode_readahead_blks=%u",2999 sbi->s_inode_readahead_blks);3000 3001 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||3002 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))3003 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);3004 if (nodefs || sbi->s_max_dir_size_kb)3005 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);3006 if (test_opt(sb, DATA_ERR_ABORT))3007 SEQ_OPTS_PUTS("data_err=abort");3008 3009 fscrypt_show_test_dummy_encryption(seq, sep, sb);3010 3011 if (sb->s_flags & SB_INLINECRYPT)3012 SEQ_OPTS_PUTS("inlinecrypt");3013 3014 if (test_opt(sb, DAX_ALWAYS)) {3015 if (IS_EXT2_SB(sb))3016 SEQ_OPTS_PUTS("dax");3017 else3018 SEQ_OPTS_PUTS("dax=always");3019 } else if (test_opt2(sb, DAX_NEVER)) {3020 SEQ_OPTS_PUTS("dax=never");3021 } else if (test_opt2(sb, DAX_INODE)) {3022 SEQ_OPTS_PUTS("dax=inode");3023 }3024 3025 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&3026 !test_opt2(sb, MB_OPTIMIZE_SCAN)) {3027 SEQ_OPTS_PUTS("mb_optimize_scan=0");3028 } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&3029 test_opt2(sb, MB_OPTIMIZE_SCAN)) {3030 SEQ_OPTS_PUTS("mb_optimize_scan=1");3031 }3032 3033 ext4_show_quota_options(seq, sb);3034 return 0;3035}3036 3037static int ext4_show_options(struct seq_file *seq, struct dentry *root)3038{3039 return _ext4_show_options(seq, root->d_sb, 0);3040}3041 3042int ext4_seq_options_show(struct seq_file *seq, void *offset)3043{3044 struct super_block *sb = seq->private;3045 int rc;3046 3047 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");3048 rc = _ext4_show_options(seq, sb, 1);3049 seq_putc(seq, '\n');3050 return rc;3051}3052 3053static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,3054 int read_only)3055{3056 struct ext4_sb_info *sbi = EXT4_SB(sb);3057 int err = 0;3058 3059 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {3060 ext4_msg(sb, KERN_ERR, "revision level too high, "3061 "forcing read-only mode");3062 err = -EROFS;3063 goto done;3064 }3065 if (read_only)3066 goto done;3067 if (!(sbi->s_mount_state & EXT4_VALID_FS))3068 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "3069 "running e2fsck is recommended");3070 else if (sbi->s_mount_state & EXT4_ERROR_FS)3071 ext4_msg(sb, KERN_WARNING,3072 "warning: mounting fs with errors, "3073 "running e2fsck is recommended");3074 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&3075 le16_to_cpu(es->s_mnt_count) >=3076 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))3077 ext4_msg(sb, KERN_WARNING,3078 "warning: maximal mount count reached, "3079 "running e2fsck is recommended");3080 else if (le32_to_cpu(es->s_checkinterval) &&3081 (ext4_get_tstamp(es, s_lastcheck) +3082 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))3083 ext4_msg(sb, KERN_WARNING,3084 "warning: checktime reached, "3085 "running e2fsck is recommended");3086 if (!sbi->s_journal)3087 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);3088 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))3089 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);3090 le16_add_cpu(&es->s_mnt_count, 1);3091 ext4_update_tstamp(es, s_mtime);3092 if (sbi->s_journal) {3093 ext4_set_feature_journal_needs_recovery(sb);3094 if (ext4_has_feature_orphan_file(sb))3095 ext4_set_feature_orphan_present(sb);3096 }3097 3098 err = ext4_commit_super(sb);3099done:3100 if (test_opt(sb, DEBUG))3101 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "3102 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",3103 sb->s_blocksize,3104 sbi->s_groups_count,3105 EXT4_BLOCKS_PER_GROUP(sb),3106 EXT4_INODES_PER_GROUP(sb),3107 sbi->s_mount_opt, sbi->s_mount_opt2);3108 return err;3109}3110 3111int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)3112{3113 struct ext4_sb_info *sbi = EXT4_SB(sb);3114 struct flex_groups **old_groups, **new_groups;3115 int size, i, j;3116 3117 if (!sbi->s_log_groups_per_flex)3118 return 0;3119 3120 size = ext4_flex_group(sbi, ngroup - 1) + 1;3121 if (size <= sbi->s_flex_groups_allocated)3122 return 0;3123 3124 new_groups = kvzalloc(roundup_pow_of_two(size *3125 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);3126 if (!new_groups) {3127 ext4_msg(sb, KERN_ERR,3128 "not enough memory for %d flex group pointers", size);3129 return -ENOMEM;3130 }3131 for (i = sbi->s_flex_groups_allocated; i < size; i++) {3132 new_groups[i] = kvzalloc(roundup_pow_of_two(3133 sizeof(struct flex_groups)),3134 GFP_KERNEL);3135 if (!new_groups[i]) {3136 for (j = sbi->s_flex_groups_allocated; j < i; j++)3137 kvfree(new_groups[j]);3138 kvfree(new_groups);3139 ext4_msg(sb, KERN_ERR,3140 "not enough memory for %d flex groups", size);3141 return -ENOMEM;3142 }3143 }3144 rcu_read_lock();3145 old_groups = rcu_dereference(sbi->s_flex_groups);3146 if (old_groups)3147 memcpy(new_groups, old_groups,3148 (sbi->s_flex_groups_allocated *3149 sizeof(struct flex_groups *)));3150 rcu_read_unlock();3151 rcu_assign_pointer(sbi->s_flex_groups, new_groups);3152 sbi->s_flex_groups_allocated = size;3153 if (old_groups)3154 ext4_kvfree_array_rcu(old_groups);3155 return 0;3156}3157 3158static int ext4_fill_flex_info(struct super_block *sb)3159{3160 struct ext4_sb_info *sbi = EXT4_SB(sb);3161 struct ext4_group_desc *gdp = NULL;3162 struct flex_groups *fg;3163 ext4_group_t flex_group;3164 int i, err;3165 3166 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;3167 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {3168 sbi->s_log_groups_per_flex = 0;3169 return 1;3170 }3171 3172 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);3173 if (err)3174 goto failed;3175 3176 for (i = 0; i < sbi->s_groups_count; i++) {3177 gdp = ext4_get_group_desc(sb, i, NULL);3178 3179 flex_group = ext4_flex_group(sbi, i);3180 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);3181 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);3182 atomic64_add(ext4_free_group_clusters(sb, gdp),3183 &fg->free_clusters);3184 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);3185 }3186 3187 return 1;3188failed:3189 return 0;3190}3191 3192static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,3193 struct ext4_group_desc *gdp)3194{3195 int offset = offsetof(struct ext4_group_desc, bg_checksum);3196 __u16 crc = 0;3197 __le32 le_group = cpu_to_le32(block_group);3198 struct ext4_sb_info *sbi = EXT4_SB(sb);3199 3200 if (ext4_has_metadata_csum(sbi->s_sb)) {3201 /* Use new metadata_csum algorithm */3202 __u32 csum32;3203 __u16 dummy_csum = 0;3204 3205 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,3206 sizeof(le_group));3207 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);3208 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,3209 sizeof(dummy_csum));3210 offset += sizeof(dummy_csum);3211 if (offset < sbi->s_desc_size)3212 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,3213 sbi->s_desc_size - offset);3214 3215 crc = csum32 & 0xFFFF;3216 goto out;3217 }3218 3219 /* old crc16 code */3220 if (!ext4_has_feature_gdt_csum(sb))3221 return 0;3222 3223 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));3224 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));3225 crc = crc16(crc, (__u8 *)gdp, offset);3226 offset += sizeof(gdp->bg_checksum); /* skip checksum */3227 /* for checksum of struct ext4_group_desc do the rest...*/3228 if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size)3229 crc = crc16(crc, (__u8 *)gdp + offset,3230 sbi->s_desc_size - offset);3231 3232out:3233 return cpu_to_le16(crc);3234}3235 3236int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,3237 struct ext4_group_desc *gdp)3238{3239 if (ext4_has_group_desc_csum(sb) &&3240 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))3241 return 0;3242 3243 return 1;3244}3245 3246void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,3247 struct ext4_group_desc *gdp)3248{3249 if (!ext4_has_group_desc_csum(sb))3250 return;3251 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);3252}3253 3254/* Called at mount-time, super-block is locked */3255static int ext4_check_descriptors(struct super_block *sb,3256 ext4_fsblk_t sb_block,3257 ext4_group_t *first_not_zeroed)3258{3259 struct ext4_sb_info *sbi = EXT4_SB(sb);3260 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);3261 ext4_fsblk_t last_block;3262 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);3263 ext4_fsblk_t block_bitmap;3264 ext4_fsblk_t inode_bitmap;3265 ext4_fsblk_t inode_table;3266 int flexbg_flag = 0;3267 ext4_group_t i, grp = sbi->s_groups_count;3268 3269 if (ext4_has_feature_flex_bg(sb))3270 flexbg_flag = 1;3271 3272 ext4_debug("Checking group descriptors");3273 3274 for (i = 0; i < sbi->s_groups_count; i++) {3275 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);3276 3277 if (i == sbi->s_groups_count - 1 || flexbg_flag)3278 last_block = ext4_blocks_count(sbi->s_es) - 1;3279 else3280 last_block = first_block +3281 (EXT4_BLOCKS_PER_GROUP(sb) - 1);3282 3283 if ((grp == sbi->s_groups_count) &&3284 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))3285 grp = i;3286 3287 block_bitmap = ext4_block_bitmap(sb, gdp);3288 if (block_bitmap == sb_block) {3289 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3290 "Block bitmap for group %u overlaps "3291 "superblock", i);3292 if (!sb_rdonly(sb))3293 return 0;3294 }3295 if (block_bitmap >= sb_block + 1 &&3296 block_bitmap <= last_bg_block) {3297 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3298 "Block bitmap for group %u overlaps "3299 "block group descriptors", i);3300 if (!sb_rdonly(sb))3301 return 0;3302 }3303 if (block_bitmap < first_block || block_bitmap > last_block) {3304 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3305 "Block bitmap for group %u not in group "3306 "(block %llu)!", i, block_bitmap);3307 return 0;3308 }3309 inode_bitmap = ext4_inode_bitmap(sb, gdp);3310 if (inode_bitmap == sb_block) {3311 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3312 "Inode bitmap for group %u overlaps "3313 "superblock", i);3314 if (!sb_rdonly(sb))3315 return 0;3316 }3317 if (inode_bitmap >= sb_block + 1 &&3318 inode_bitmap <= last_bg_block) {3319 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3320 "Inode bitmap for group %u overlaps "3321 "block group descriptors", i);3322 if (!sb_rdonly(sb))3323 return 0;3324 }3325 if (inode_bitmap < first_block || inode_bitmap > last_block) {3326 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3327 "Inode bitmap for group %u not in group "3328 "(block %llu)!", i, inode_bitmap);3329 return 0;3330 }3331 inode_table = ext4_inode_table(sb, gdp);3332 if (inode_table == sb_block) {3333 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3334 "Inode table for group %u overlaps "3335 "superblock", i);3336 if (!sb_rdonly(sb))3337 return 0;3338 }3339 if (inode_table >= sb_block + 1 &&3340 inode_table <= last_bg_block) {3341 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3342 "Inode table for group %u overlaps "3343 "block group descriptors", i);3344 if (!sb_rdonly(sb))3345 return 0;3346 }3347 if (inode_table < first_block ||3348 inode_table + sbi->s_itb_per_group - 1 > last_block) {3349 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3350 "Inode table for group %u not in group "3351 "(block %llu)!", i, inode_table);3352 return 0;3353 }3354 ext4_lock_group(sb, i);3355 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {3356 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "3357 "Checksum for group %u failed (%u!=%u)",3358 i, le16_to_cpu(ext4_group_desc_csum(sb, i,3359 gdp)), le16_to_cpu(gdp->bg_checksum));3360 if (!sb_rdonly(sb)) {3361 ext4_unlock_group(sb, i);3362 return 0;3363 }3364 }3365 ext4_unlock_group(sb, i);3366 if (!flexbg_flag)3367 first_block += EXT4_BLOCKS_PER_GROUP(sb);3368 }3369 if (NULL != first_not_zeroed)3370 *first_not_zeroed = grp;3371 return 1;3372}3373 3374/*3375 * Maximal extent format file size.3376 * Resulting logical blkno at s_maxbytes must fit in our on-disk3377 * extent format containers, within a sector_t, and within i_blocks3378 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,3379 * so that won't be a limiting factor.3380 *3381 * However there is other limiting factor. We do store extents in the form3382 * of starting block and length, hence the resulting length of the extent3383 * covering maximum file size must fit into on-disk format containers as3384 * well. Given that length is always by 1 unit bigger than max unit (because3385 * we count 0 as well) we have to lower the s_maxbytes by one fs block.3386 *3387 * Note, this does *not* consider any metadata overhead for vfs i_blocks.3388 */3389static loff_t ext4_max_size(int blkbits, int has_huge_files)3390{3391 loff_t res;3392 loff_t upper_limit = MAX_LFS_FILESIZE;3393 3394 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));3395 3396 if (!has_huge_files) {3397 upper_limit = (1LL << 32) - 1;3398 3399 /* total blocks in file system block size */3400 upper_limit >>= (blkbits - 9);3401 upper_limit <<= blkbits;3402 }3403 3404 /*3405 * 32-bit extent-start container, ee_block. We lower the maxbytes3406 * by one fs block, so ee_len can cover the extent of maximum file3407 * size3408 */3409 res = (1LL << 32) - 1;3410 res <<= blkbits;3411 3412 /* Sanity check against vm- & vfs- imposed limits */3413 if (res > upper_limit)3414 res = upper_limit;3415 3416 return res;3417}3418 3419/*3420 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect3421 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.3422 * We need to be 1 filesystem block less than the 2^48 sector limit.3423 */3424static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)3425{3426 loff_t upper_limit, res = EXT4_NDIR_BLOCKS;3427 int meta_blocks;3428 unsigned int ppb = 1 << (bits - 2);3429 3430 /*3431 * This is calculated to be the largest file size for a dense, block3432 * mapped file such that the file's total number of 512-byte sectors,3433 * including data and all indirect blocks, does not exceed (2^48 - 1).3434 *3435 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total3436 * number of 512-byte sectors of the file.3437 */3438 if (!has_huge_files) {3439 /*3440 * !has_huge_files or implies that the inode i_block field3441 * represents total file blocks in 2^32 512-byte sectors ==3442 * size of vfs inode i_blocks * 83443 */3444 upper_limit = (1LL << 32) - 1;3445 3446 /* total blocks in file system block size */3447 upper_limit >>= (bits - 9);3448 3449 } else {3450 /*3451 * We use 48 bit ext4_inode i_blocks3452 * With EXT4_HUGE_FILE_FL set the i_blocks3453 * represent total number of blocks in3454 * file system block size3455 */3456 upper_limit = (1LL << 48) - 1;3457 3458 }3459 3460 /* Compute how many blocks we can address by block tree */3461 res += ppb;3462 res += ppb * ppb;3463 res += ((loff_t)ppb) * ppb * ppb;3464 /* Compute how many metadata blocks are needed */3465 meta_blocks = 1;3466 meta_blocks += 1 + ppb;3467 meta_blocks += 1 + ppb + ppb * ppb;3468 /* Does block tree limit file size? */3469 if (res + meta_blocks <= upper_limit)3470 goto check_lfs;3471 3472 res = upper_limit;3473 /* How many metadata blocks are needed for addressing upper_limit? */3474 upper_limit -= EXT4_NDIR_BLOCKS;3475 /* indirect blocks */3476 meta_blocks = 1;3477 upper_limit -= ppb;3478 /* double indirect blocks */3479 if (upper_limit < ppb * ppb) {3480 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb);3481 res -= meta_blocks;3482 goto check_lfs;3483 }3484 meta_blocks += 1 + ppb;3485 upper_limit -= ppb * ppb;3486 /* tripple indirect blocks for the rest */3487 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) +3488 DIV_ROUND_UP_ULL(upper_limit, ppb*ppb);3489 res -= meta_blocks;3490check_lfs:3491 res <<= bits;3492 if (res > MAX_LFS_FILESIZE)3493 res = MAX_LFS_FILESIZE;3494 3495 return res;3496}3497 3498static ext4_fsblk_t descriptor_loc(struct super_block *sb,3499 ext4_fsblk_t logical_sb_block, int nr)3500{3501 struct ext4_sb_info *sbi = EXT4_SB(sb);3502 ext4_group_t bg, first_meta_bg;3503 int has_super = 0;3504 3505 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);3506 3507 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)3508 return logical_sb_block + nr + 1;3509 bg = sbi->s_desc_per_block * nr;3510 if (ext4_bg_has_super(sb, bg))3511 has_super = 1;3512 3513 /*3514 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at3515 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled3516 * on modern mke2fs or blksize > 1k on older mke2fs) then we must3517 * compensate.3518 */3519 if (sb->s_blocksize == 1024 && nr == 0 &&3520 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)3521 has_super++;3522 3523 return (has_super + ext4_group_first_block_no(sb, bg));3524}3525 3526/**3527 * ext4_get_stripe_size: Get the stripe size.3528 * @sbi: In memory super block info3529 *3530 * If we have specified it via mount option, then3531 * use the mount option value. If the value specified at mount time is3532 * greater than the blocks per group use the super block value.3533 * If the super block value is greater than blocks per group return 0.3534 * Allocator needs it be less than blocks per group.3535 *3536 */3537static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)3538{3539 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);3540 unsigned long stripe_width =3541 le32_to_cpu(sbi->s_es->s_raid_stripe_width);3542 int ret;3543 3544 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)3545 ret = sbi->s_stripe;3546 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)3547 ret = stripe_width;3548 else if (stride && stride <= sbi->s_blocks_per_group)3549 ret = stride;3550 else3551 ret = 0;3552 3553 /*3554 * If the stripe width is 1, this makes no sense and3555 * we set it to 0 to turn off stripe handling code.3556 */3557 if (ret <= 1)3558 ret = 0;3559 3560 return ret;3561}3562 3563/*3564 * Check whether this filesystem can be mounted based on3565 * the features present and the RDONLY/RDWR mount requested.3566 * Returns 1 if this filesystem can be mounted as requested,3567 * 0 if it cannot be.3568 */3569int ext4_feature_set_ok(struct super_block *sb, int readonly)3570{3571 if (ext4_has_unknown_ext4_incompat_features(sb)) {3572 ext4_msg(sb, KERN_ERR,3573 "Couldn't mount because of "3574 "unsupported optional features (%x)",3575 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &3576 ~EXT4_FEATURE_INCOMPAT_SUPP));3577 return 0;3578 }3579 3580 if (!IS_ENABLED(CONFIG_UNICODE) && ext4_has_feature_casefold(sb)) {3581 ext4_msg(sb, KERN_ERR,3582 "Filesystem with casefold feature cannot be "3583 "mounted without CONFIG_UNICODE");3584 return 0;3585 }3586 3587 if (readonly)3588 return 1;3589 3590 if (ext4_has_feature_readonly(sb)) {3591 ext4_msg(sb, KERN_INFO, "filesystem is read-only");3592 sb->s_flags |= SB_RDONLY;3593 return 1;3594 }3595 3596 /* Check that feature set is OK for a read-write mount */3597 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {3598 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "3599 "unsupported optional features (%x)",3600 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &3601 ~EXT4_FEATURE_RO_COMPAT_SUPP));3602 return 0;3603 }3604 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {3605 ext4_msg(sb, KERN_ERR,3606 "Can't support bigalloc feature without "3607 "extents feature\n");3608 return 0;3609 }3610 3611#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)3612 if (!readonly && (ext4_has_feature_quota(sb) ||3613 ext4_has_feature_project(sb))) {3614 ext4_msg(sb, KERN_ERR,3615 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");3616 return 0;3617 }3618#endif /* CONFIG_QUOTA */3619 return 1;3620}3621 3622/*3623 * This function is called once a day if we have errors logged3624 * on the file system3625 */3626static void print_daily_error_info(struct timer_list *t)3627{3628 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);3629 struct super_block *sb = sbi->s_sb;3630 struct ext4_super_block *es = sbi->s_es;3631 3632 if (es->s_error_count)3633 /* fsck newer than v1.41.13 is needed to clean this condition. */3634 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",3635 le32_to_cpu(es->s_error_count));3636 if (es->s_first_error_time) {3637 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",3638 sb->s_id,3639 ext4_get_tstamp(es, s_first_error_time),3640 (int) sizeof(es->s_first_error_func),3641 es->s_first_error_func,3642 le32_to_cpu(es->s_first_error_line));3643 if (es->s_first_error_ino)3644 printk(KERN_CONT ": inode %u",3645 le32_to_cpu(es->s_first_error_ino));3646 if (es->s_first_error_block)3647 printk(KERN_CONT ": block %llu", (unsigned long long)3648 le64_to_cpu(es->s_first_error_block));3649 printk(KERN_CONT "\n");3650 }3651 if (es->s_last_error_time) {3652 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",3653 sb->s_id,3654 ext4_get_tstamp(es, s_last_error_time),3655 (int) sizeof(es->s_last_error_func),3656 es->s_last_error_func,3657 le32_to_cpu(es->s_last_error_line));3658 if (es->s_last_error_ino)3659 printk(KERN_CONT ": inode %u",3660 le32_to_cpu(es->s_last_error_ino));3661 if (es->s_last_error_block)3662 printk(KERN_CONT ": block %llu", (unsigned long long)3663 le64_to_cpu(es->s_last_error_block));3664 printk(KERN_CONT "\n");3665 }3666 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */3667}3668 3669/* Find next suitable group and run ext4_init_inode_table */3670static int ext4_run_li_request(struct ext4_li_request *elr)3671{3672 struct ext4_group_desc *gdp = NULL;3673 struct super_block *sb = elr->lr_super;3674 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;3675 ext4_group_t group = elr->lr_next_group;3676 unsigned int prefetch_ios = 0;3677 int ret = 0;3678 int nr = EXT4_SB(sb)->s_mb_prefetch;3679 u64 start_time;3680 3681 if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {3682 elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios);3683 ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr);3684 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr);3685 if (group >= elr->lr_next_group) {3686 ret = 1;3687 if (elr->lr_first_not_zeroed != ngroups &&3688 !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {3689 elr->lr_next_group = elr->lr_first_not_zeroed;3690 elr->lr_mode = EXT4_LI_MODE_ITABLE;3691 ret = 0;3692 }3693 }3694 return ret;3695 }3696 3697 for (; group < ngroups; group++) {3698 gdp = ext4_get_group_desc(sb, group, NULL);3699 if (!gdp) {3700 ret = 1;3701 break;3702 }3703 3704 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))3705 break;3706 }3707 3708 if (group >= ngroups)3709 ret = 1;3710 3711 if (!ret) {3712 start_time = ktime_get_real_ns();3713 ret = ext4_init_inode_table(sb, group,3714 elr->lr_timeout ? 0 : 1);3715 trace_ext4_lazy_itable_init(sb, group);3716 if (elr->lr_timeout == 0) {3717 elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *3718 EXT4_SB(elr->lr_super)->s_li_wait_mult);3719 }3720 elr->lr_next_sched = jiffies + elr->lr_timeout;3721 elr->lr_next_group = group + 1;3722 }3723 return ret;3724}3725 3726/*3727 * Remove lr_request from the list_request and free the3728 * request structure. Should be called with li_list_mtx held3729 */3730static void ext4_remove_li_request(struct ext4_li_request *elr)3731{3732 if (!elr)3733 return;3734 3735 list_del(&elr->lr_request);3736 EXT4_SB(elr->lr_super)->s_li_request = NULL;3737 kfree(elr);3738}3739 3740static void ext4_unregister_li_request(struct super_block *sb)3741{3742 mutex_lock(&ext4_li_mtx);3743 if (!ext4_li_info) {3744 mutex_unlock(&ext4_li_mtx);3745 return;3746 }3747 3748 mutex_lock(&ext4_li_info->li_list_mtx);3749 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);3750 mutex_unlock(&ext4_li_info->li_list_mtx);3751 mutex_unlock(&ext4_li_mtx);3752}3753 3754static struct task_struct *ext4_lazyinit_task;3755 3756/*3757 * This is the function where ext4lazyinit thread lives. It walks3758 * through the request list searching for next scheduled filesystem.3759 * When such a fs is found, run the lazy initialization request3760 * (ext4_rn_li_request) and keep track of the time spend in this3761 * function. Based on that time we compute next schedule time of3762 * the request. When walking through the list is complete, compute3763 * next waking time and put itself into sleep.3764 */3765static int ext4_lazyinit_thread(void *arg)3766{3767 struct ext4_lazy_init *eli = arg;3768 struct list_head *pos, *n;3769 struct ext4_li_request *elr;3770 unsigned long next_wakeup, cur;3771 3772 BUG_ON(NULL == eli);3773 set_freezable();3774 3775cont_thread:3776 while (true) {3777 next_wakeup = MAX_JIFFY_OFFSET;3778 3779 mutex_lock(&eli->li_list_mtx);3780 if (list_empty(&eli->li_request_list)) {3781 mutex_unlock(&eli->li_list_mtx);3782 goto exit_thread;3783 }3784 list_for_each_safe(pos, n, &eli->li_request_list) {3785 int err = 0;3786 int progress = 0;3787 elr = list_entry(pos, struct ext4_li_request,3788 lr_request);3789 3790 if (time_before(jiffies, elr->lr_next_sched)) {3791 if (time_before(elr->lr_next_sched, next_wakeup))3792 next_wakeup = elr->lr_next_sched;3793 continue;3794 }3795 if (down_read_trylock(&elr->lr_super->s_umount)) {3796 if (sb_start_write_trylock(elr->lr_super)) {3797 progress = 1;3798 /*3799 * We hold sb->s_umount, sb can not3800 * be removed from the list, it is3801 * now safe to drop li_list_mtx3802 */3803 mutex_unlock(&eli->li_list_mtx);3804 err = ext4_run_li_request(elr);3805 sb_end_write(elr->lr_super);3806 mutex_lock(&eli->li_list_mtx);3807 n = pos->next;3808 }3809 up_read((&elr->lr_super->s_umount));3810 }3811 /* error, remove the lazy_init job */3812 if (err) {3813 ext4_remove_li_request(elr);3814 continue;3815 }3816 if (!progress) {3817 elr->lr_next_sched = jiffies +3818 get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);3819 }3820 if (time_before(elr->lr_next_sched, next_wakeup))3821 next_wakeup = elr->lr_next_sched;3822 }3823 mutex_unlock(&eli->li_list_mtx);3824 3825 try_to_freeze();3826 3827 cur = jiffies;3828 if ((time_after_eq(cur, next_wakeup)) ||3829 (MAX_JIFFY_OFFSET == next_wakeup)) {3830 cond_resched();3831 continue;3832 }3833 3834 schedule_timeout_interruptible(next_wakeup - cur);3835 3836 if (kthread_should_stop()) {3837 ext4_clear_request_list();3838 goto exit_thread;3839 }3840 }3841 3842exit_thread:3843 /*3844 * It looks like the request list is empty, but we need3845 * to check it under the li_list_mtx lock, to prevent any3846 * additions into it, and of course we should lock ext4_li_mtx3847 * to atomically free the list and ext4_li_info, because at3848 * this point another ext4 filesystem could be registering3849 * new one.3850 */3851 mutex_lock(&ext4_li_mtx);3852 mutex_lock(&eli->li_list_mtx);3853 if (!list_empty(&eli->li_request_list)) {3854 mutex_unlock(&eli->li_list_mtx);3855 mutex_unlock(&ext4_li_mtx);3856 goto cont_thread;3857 }3858 mutex_unlock(&eli->li_list_mtx);3859 kfree(ext4_li_info);3860 ext4_li_info = NULL;3861 mutex_unlock(&ext4_li_mtx);3862 3863 return 0;3864}3865 3866static void ext4_clear_request_list(void)3867{3868 struct list_head *pos, *n;3869 struct ext4_li_request *elr;3870 3871 mutex_lock(&ext4_li_info->li_list_mtx);3872 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {3873 elr = list_entry(pos, struct ext4_li_request,3874 lr_request);3875 ext4_remove_li_request(elr);3876 }3877 mutex_unlock(&ext4_li_info->li_list_mtx);3878}3879 3880static int ext4_run_lazyinit_thread(void)3881{3882 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,3883 ext4_li_info, "ext4lazyinit");3884 if (IS_ERR(ext4_lazyinit_task)) {3885 int err = PTR_ERR(ext4_lazyinit_task);3886 ext4_clear_request_list();3887 kfree(ext4_li_info);3888 ext4_li_info = NULL;3889 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "3890 "initialization thread\n",3891 err);3892 return err;3893 }3894 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;3895 return 0;3896}3897 3898/*3899 * Check whether it make sense to run itable init. thread or not.3900 * If there is at least one uninitialized inode table, return3901 * corresponding group number, else the loop goes through all3902 * groups and return total number of groups.3903 */3904static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)3905{3906 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;3907 struct ext4_group_desc *gdp = NULL;3908 3909 if (!ext4_has_group_desc_csum(sb))3910 return ngroups;3911 3912 for (group = 0; group < ngroups; group++) {3913 gdp = ext4_get_group_desc(sb, group, NULL);3914 if (!gdp)3915 continue;3916 3917 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))3918 break;3919 }3920 3921 return group;3922}3923 3924static int ext4_li_info_new(void)3925{3926 struct ext4_lazy_init *eli = NULL;3927 3928 eli = kzalloc(sizeof(*eli), GFP_KERNEL);3929 if (!eli)3930 return -ENOMEM;3931 3932 INIT_LIST_HEAD(&eli->li_request_list);3933 mutex_init(&eli->li_list_mtx);3934 3935 eli->li_state |= EXT4_LAZYINIT_QUIT;3936 3937 ext4_li_info = eli;3938 3939 return 0;3940}3941 3942static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,3943 ext4_group_t start)3944{3945 struct ext4_li_request *elr;3946 3947 elr = kzalloc(sizeof(*elr), GFP_KERNEL);3948 if (!elr)3949 return NULL;3950 3951 elr->lr_super = sb;3952 elr->lr_first_not_zeroed = start;3953 if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {3954 elr->lr_mode = EXT4_LI_MODE_ITABLE;3955 elr->lr_next_group = start;3956 } else {3957 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;3958 }3959 3960 /*3961 * Randomize first schedule time of the request to3962 * spread the inode table initialization requests3963 * better.3964 */3965 elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);3966 return elr;3967}3968 3969int ext4_register_li_request(struct super_block *sb,3970 ext4_group_t first_not_zeroed)3971{3972 struct ext4_sb_info *sbi = EXT4_SB(sb);3973 struct ext4_li_request *elr = NULL;3974 ext4_group_t ngroups = sbi->s_groups_count;3975 int ret = 0;3976 3977 mutex_lock(&ext4_li_mtx);3978 if (sbi->s_li_request != NULL) {3979 /*3980 * Reset timeout so it can be computed again, because3981 * s_li_wait_mult might have changed.3982 */3983 sbi->s_li_request->lr_timeout = 0;3984 goto out;3985 }3986 3987 if (sb_rdonly(sb) ||3988 (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&3989 (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))3990 goto out;3991 3992 elr = ext4_li_request_new(sb, first_not_zeroed);3993 if (!elr) {3994 ret = -ENOMEM;3995 goto out;3996 }3997 3998 if (NULL == ext4_li_info) {3999 ret = ext4_li_info_new();4000 if (ret)4001 goto out;4002 }4003 4004 mutex_lock(&ext4_li_info->li_list_mtx);4005 list_add(&elr->lr_request, &ext4_li_info->li_request_list);4006 mutex_unlock(&ext4_li_info->li_list_mtx);4007 4008 sbi->s_li_request = elr;4009 /*4010 * set elr to NULL here since it has been inserted to4011 * the request_list and the removal and free of it is4012 * handled by ext4_clear_request_list from now on.4013 */4014 elr = NULL;4015 4016 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {4017 ret = ext4_run_lazyinit_thread();4018 if (ret)4019 goto out;4020 }4021out:4022 mutex_unlock(&ext4_li_mtx);4023 if (ret)4024 kfree(elr);4025 return ret;4026}4027 4028/*4029 * We do not need to lock anything since this is called on4030 * module unload.4031 */4032static void ext4_destroy_lazyinit_thread(void)4033{4034 /*4035 * If thread exited earlier4036 * there's nothing to be done.4037 */4038 if (!ext4_li_info || !ext4_lazyinit_task)4039 return;4040 4041 kthread_stop(ext4_lazyinit_task);4042}4043 4044static int set_journal_csum_feature_set(struct super_block *sb)4045{4046 int ret = 1;4047 int compat, incompat;4048 struct ext4_sb_info *sbi = EXT4_SB(sb);4049 4050 if (ext4_has_metadata_csum(sb)) {4051 /* journal checksum v3 */4052 compat = 0;4053 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;4054 } else {4055 /* journal checksum v1 */4056 compat = JBD2_FEATURE_COMPAT_CHECKSUM;4057 incompat = 0;4058 }4059 4060 jbd2_journal_clear_features(sbi->s_journal,4061 JBD2_FEATURE_COMPAT_CHECKSUM, 0,4062 JBD2_FEATURE_INCOMPAT_CSUM_V3 |4063 JBD2_FEATURE_INCOMPAT_CSUM_V2);4064 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {4065 ret = jbd2_journal_set_features(sbi->s_journal,4066 compat, 0,4067 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |4068 incompat);4069 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {4070 ret = jbd2_journal_set_features(sbi->s_journal,4071 compat, 0,4072 incompat);4073 jbd2_journal_clear_features(sbi->s_journal, 0, 0,4074 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);4075 } else {4076 jbd2_journal_clear_features(sbi->s_journal, 0, 0,4077 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);4078 }4079 4080 return ret;4081}4082 4083/*4084 * Note: calculating the overhead so we can be compatible with4085 * historical BSD practice is quite difficult in the face of4086 * clusters/bigalloc. This is because multiple metadata blocks from4087 * different block group can end up in the same allocation cluster.4088 * Calculating the exact overhead in the face of clustered allocation4089 * requires either O(all block bitmaps) in memory or O(number of block4090 * groups**2) in time. We will still calculate the superblock for4091 * older file systems --- and if we come across with a bigalloc file4092 * system with zero in s_overhead_clusters the estimate will be close to4093 * correct especially for very large cluster sizes --- but for newer4094 * file systems, it's better to calculate this figure once at mkfs4095 * time, and store it in the superblock. If the superblock value is4096 * present (even for non-bigalloc file systems), we will use it.4097 */4098static int count_overhead(struct super_block *sb, ext4_group_t grp,4099 char *buf)4100{4101 struct ext4_sb_info *sbi = EXT4_SB(sb);4102 struct ext4_group_desc *gdp;4103 ext4_fsblk_t first_block, last_block, b;4104 ext4_group_t i, ngroups = ext4_get_groups_count(sb);4105 int s, j, count = 0;4106 int has_super = ext4_bg_has_super(sb, grp);4107 4108 if (!ext4_has_feature_bigalloc(sb))4109 return (has_super + ext4_bg_num_gdb(sb, grp) +4110 (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) +4111 sbi->s_itb_per_group + 2);4112 4113 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +4114 (grp * EXT4_BLOCKS_PER_GROUP(sb));4115 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;4116 for (i = 0; i < ngroups; i++) {4117 gdp = ext4_get_group_desc(sb, i, NULL);4118 b = ext4_block_bitmap(sb, gdp);4119 if (b >= first_block && b <= last_block) {4120 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);4121 count++;4122 }4123 b = ext4_inode_bitmap(sb, gdp);4124 if (b >= first_block && b <= last_block) {4125 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);4126 count++;4127 }4128 b = ext4_inode_table(sb, gdp);4129 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)4130 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {4131 int c = EXT4_B2C(sbi, b - first_block);4132 ext4_set_bit(c, buf);4133 count++;4134 }4135 if (i != grp)4136 continue;4137 s = 0;4138 if (ext4_bg_has_super(sb, grp)) {4139 ext4_set_bit(s++, buf);4140 count++;4141 }4142 j = ext4_bg_num_gdb(sb, grp);4143 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {4144 ext4_error(sb, "Invalid number of block group "4145 "descriptor blocks: %d", j);4146 j = EXT4_BLOCKS_PER_GROUP(sb) - s;4147 }4148 count += j;4149 for (; j > 0; j--)4150 ext4_set_bit(EXT4_B2C(sbi, s++), buf);4151 }4152 if (!count)4153 return 0;4154 return EXT4_CLUSTERS_PER_GROUP(sb) -4155 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);4156}4157 4158/*4159 * Compute the overhead and stash it in sbi->s_overhead4160 */4161int ext4_calculate_overhead(struct super_block *sb)4162{4163 struct ext4_sb_info *sbi = EXT4_SB(sb);4164 struct ext4_super_block *es = sbi->s_es;4165 struct inode *j_inode;4166 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);4167 ext4_group_t i, ngroups = ext4_get_groups_count(sb);4168 ext4_fsblk_t overhead = 0;4169 char *buf = (char *) get_zeroed_page(GFP_NOFS);4170 4171 if (!buf)4172 return -ENOMEM;4173 4174 /*4175 * Compute the overhead (FS structures). This is constant4176 * for a given filesystem unless the number of block groups4177 * changes so we cache the previous value until it does.4178 */4179 4180 /*4181 * All of the blocks before first_data_block are overhead4182 */4183 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));4184 4185 /*4186 * Add the overhead found in each block group4187 */4188 for (i = 0; i < ngroups; i++) {4189 int blks;4190 4191 blks = count_overhead(sb, i, buf);4192 overhead += blks;4193 if (blks)4194 memset(buf, 0, PAGE_SIZE);4195 cond_resched();4196 }4197 4198 /*4199 * Add the internal journal blocks whether the journal has been4200 * loaded or not4201 */4202 if (sbi->s_journal && !sbi->s_journal_bdev_file)4203 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);4204 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {4205 /* j_inum for internal journal is non-zero */4206 j_inode = ext4_get_journal_inode(sb, j_inum);4207 if (!IS_ERR(j_inode)) {4208 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;4209 overhead += EXT4_NUM_B2C(sbi, j_blocks);4210 iput(j_inode);4211 } else {4212 ext4_msg(sb, KERN_ERR, "can't get journal size");4213 }4214 }4215 sbi->s_overhead = overhead;4216 smp_wmb();4217 free_page((unsigned long) buf);4218 return 0;4219}4220 4221static void ext4_set_resv_clusters(struct super_block *sb)4222{4223 ext4_fsblk_t resv_clusters;4224 struct ext4_sb_info *sbi = EXT4_SB(sb);4225 4226 /*4227 * There's no need to reserve anything when we aren't using extents.4228 * The space estimates are exact, there are no unwritten extents,4229 * hole punching doesn't need new metadata... This is needed especially4230 * to keep ext2/3 backward compatibility.4231 */4232 if (!ext4_has_feature_extents(sb))4233 return;4234 /*4235 * By default we reserve 2% or 4096 clusters, whichever is smaller.4236 * This should cover the situations where we can not afford to run4237 * out of space like for example punch hole, or converting4238 * unwritten extents in delalloc path. In most cases such4239 * allocation would require 1, or 2 blocks, higher numbers are4240 * very rare.4241 */4242 resv_clusters = (ext4_blocks_count(sbi->s_es) >>4243 sbi->s_cluster_bits);4244 4245 do_div(resv_clusters, 50);4246 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);4247 4248 atomic64_set(&sbi->s_resv_clusters, resv_clusters);4249}4250 4251static const char *ext4_quota_mode(struct super_block *sb)4252{4253#ifdef CONFIG_QUOTA4254 if (!ext4_quota_capable(sb))4255 return "none";4256 4257 if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))4258 return "journalled";4259 else4260 return "writeback";4261#else4262 return "disabled";4263#endif4264}4265 4266static void ext4_setup_csum_trigger(struct super_block *sb,4267 enum ext4_journal_trigger_type type,4268 void (*trigger)(4269 struct jbd2_buffer_trigger_type *type,4270 struct buffer_head *bh,4271 void *mapped_data,4272 size_t size))4273{4274 struct ext4_sb_info *sbi = EXT4_SB(sb);4275 4276 sbi->s_journal_triggers[type].sb = sb;4277 sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;4278}4279 4280static void ext4_free_sbi(struct ext4_sb_info *sbi)4281{4282 if (!sbi)4283 return;4284 4285 kfree(sbi->s_blockgroup_lock);4286 fs_put_dax(sbi->s_daxdev, NULL);4287 kfree(sbi);4288}4289 4290static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb)4291{4292 struct ext4_sb_info *sbi;4293 4294 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);4295 if (!sbi)4296 return NULL;4297 4298 sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,4299 NULL, NULL);4300 4301 sbi->s_blockgroup_lock =4302 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);4303 4304 if (!sbi->s_blockgroup_lock)4305 goto err_out;4306 4307 sb->s_fs_info = sbi;4308 sbi->s_sb = sb;4309 return sbi;4310err_out:4311 fs_put_dax(sbi->s_daxdev, NULL);4312 kfree(sbi);4313 return NULL;4314}4315 4316static void ext4_set_def_opts(struct super_block *sb,4317 struct ext4_super_block *es)4318{4319 unsigned long def_mount_opts;4320 4321 /* Set defaults before we parse the mount options */4322 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);4323 set_opt(sb, INIT_INODE_TABLE);4324 if (def_mount_opts & EXT4_DEFM_DEBUG)4325 set_opt(sb, DEBUG);4326 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)4327 set_opt(sb, GRPID);4328 if (def_mount_opts & EXT4_DEFM_UID16)4329 set_opt(sb, NO_UID32);4330 /* xattr user namespace & acls are now defaulted on */4331 set_opt(sb, XATTR_USER);4332#ifdef CONFIG_EXT4_FS_POSIX_ACL4333 set_opt(sb, POSIX_ACL);4334#endif4335 if (ext4_has_feature_fast_commit(sb))4336 set_opt2(sb, JOURNAL_FAST_COMMIT);4337 /* don't forget to enable journal_csum when metadata_csum is enabled. */4338 if (ext4_has_metadata_csum(sb))4339 set_opt(sb, JOURNAL_CHECKSUM);4340 4341 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)4342 set_opt(sb, JOURNAL_DATA);4343 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)4344 set_opt(sb, ORDERED_DATA);4345 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)4346 set_opt(sb, WRITEBACK_DATA);4347 4348 if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC)4349 set_opt(sb, ERRORS_PANIC);4350 else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE)4351 set_opt(sb, ERRORS_CONT);4352 else4353 set_opt(sb, ERRORS_RO);4354 /* block_validity enabled by default; disable with noblock_validity */4355 set_opt(sb, BLOCK_VALIDITY);4356 if (def_mount_opts & EXT4_DEFM_DISCARD)4357 set_opt(sb, DISCARD);4358 4359 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)4360 set_opt(sb, BARRIER);4361 4362 /*4363 * enable delayed allocation by default4364 * Use -o nodelalloc to turn it off4365 */4366 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&4367 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))4368 set_opt(sb, DELALLOC);4369 4370 if (sb->s_blocksize <= PAGE_SIZE)4371 set_opt(sb, DIOREAD_NOLOCK);4372}4373 4374static int ext4_handle_clustersize(struct super_block *sb)4375{4376 struct ext4_sb_info *sbi = EXT4_SB(sb);4377 struct ext4_super_block *es = sbi->s_es;4378 int clustersize;4379 4380 /* Handle clustersize */4381 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);4382 if (ext4_has_feature_bigalloc(sb)) {4383 if (clustersize < sb->s_blocksize) {4384 ext4_msg(sb, KERN_ERR,4385 "cluster size (%d) smaller than "4386 "block size (%lu)", clustersize, sb->s_blocksize);4387 return -EINVAL;4388 }4389 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -4390 le32_to_cpu(es->s_log_block_size);4391 } else {4392 if (clustersize != sb->s_blocksize) {4393 ext4_msg(sb, KERN_ERR,4394 "fragment/cluster size (%d) != "4395 "block size (%lu)", clustersize, sb->s_blocksize);4396 return -EINVAL;4397 }4398 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {4399 ext4_msg(sb, KERN_ERR,4400 "#blocks per group too big: %lu",4401 sbi->s_blocks_per_group);4402 return -EINVAL;4403 }4404 sbi->s_cluster_bits = 0;4405 }4406 sbi->s_clusters_per_group = le32_to_cpu(es->s_clusters_per_group);4407 if (sbi->s_clusters_per_group > sb->s_blocksize * 8) {4408 ext4_msg(sb, KERN_ERR, "#clusters per group too big: %lu",4409 sbi->s_clusters_per_group);4410 return -EINVAL;4411 }4412 if (sbi->s_blocks_per_group !=4413 (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) {4414 ext4_msg(sb, KERN_ERR,4415 "blocks per group (%lu) and clusters per group (%lu) inconsistent",4416 sbi->s_blocks_per_group, sbi->s_clusters_per_group);4417 return -EINVAL;4418 }4419 sbi->s_cluster_ratio = clustersize / sb->s_blocksize;4420 4421 /* Do we have standard group size of clustersize * 8 blocks ? */4422 if (sbi->s_blocks_per_group == clustersize << 3)4423 set_opt2(sb, STD_GROUP_SIZE);4424 4425 return 0;4426}4427 4428static void ext4_fast_commit_init(struct super_block *sb)4429{4430 struct ext4_sb_info *sbi = EXT4_SB(sb);4431 4432 /* Initialize fast commit stuff */4433 atomic_set(&sbi->s_fc_subtid, 0);4434 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);4435 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);4436 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);4437 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);4438 sbi->s_fc_bytes = 0;4439 ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);4440 sbi->s_fc_ineligible_tid = 0;4441 spin_lock_init(&sbi->s_fc_lock);4442 memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));4443 sbi->s_fc_replay_state.fc_regions = NULL;4444 sbi->s_fc_replay_state.fc_regions_size = 0;4445 sbi->s_fc_replay_state.fc_regions_used = 0;4446 sbi->s_fc_replay_state.fc_regions_valid = 0;4447 sbi->s_fc_replay_state.fc_modified_inodes = NULL;4448 sbi->s_fc_replay_state.fc_modified_inodes_size = 0;4449 sbi->s_fc_replay_state.fc_modified_inodes_used = 0;4450}4451 4452static int ext4_inode_info_init(struct super_block *sb,4453 struct ext4_super_block *es)4454{4455 struct ext4_sb_info *sbi = EXT4_SB(sb);4456 4457 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {4458 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;4459 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;4460 } else {4461 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);4462 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);4463 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {4464 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",4465 sbi->s_first_ino);4466 return -EINVAL;4467 }4468 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||4469 (!is_power_of_2(sbi->s_inode_size)) ||4470 (sbi->s_inode_size > sb->s_blocksize)) {4471 ext4_msg(sb, KERN_ERR,4472 "unsupported inode size: %d",4473 sbi->s_inode_size);4474 ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize);4475 return -EINVAL;4476 }4477 /*4478 * i_atime_extra is the last extra field available for4479 * [acm]times in struct ext4_inode. Checking for that4480 * field should suffice to ensure we have extra space4481 * for all three.4482 */4483 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +4484 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {4485 sb->s_time_gran = 1;4486 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;4487 } else {4488 sb->s_time_gran = NSEC_PER_SEC;4489 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;4490 }4491 sb->s_time_min = EXT4_TIMESTAMP_MIN;4492 }4493 4494 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {4495 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -4496 EXT4_GOOD_OLD_INODE_SIZE;4497 if (ext4_has_feature_extra_isize(sb)) {4498 unsigned v, max = (sbi->s_inode_size -4499 EXT4_GOOD_OLD_INODE_SIZE);4500 4501 v = le16_to_cpu(es->s_want_extra_isize);4502 if (v > max) {4503 ext4_msg(sb, KERN_ERR,4504 "bad s_want_extra_isize: %d", v);4505 return -EINVAL;4506 }4507 if (sbi->s_want_extra_isize < v)4508 sbi->s_want_extra_isize = v;4509 4510 v = le16_to_cpu(es->s_min_extra_isize);4511 if (v > max) {4512 ext4_msg(sb, KERN_ERR,4513 "bad s_min_extra_isize: %d", v);4514 return -EINVAL;4515 }4516 if (sbi->s_want_extra_isize < v)4517 sbi->s_want_extra_isize = v;4518 }4519 }4520 4521 return 0;4522}4523 4524#if IS_ENABLED(CONFIG_UNICODE)4525static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)4526{4527 const struct ext4_sb_encodings *encoding_info;4528 struct unicode_map *encoding;4529 __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags);4530 4531 if (!ext4_has_feature_casefold(sb) || sb->s_encoding)4532 return 0;4533 4534 encoding_info = ext4_sb_read_encoding(es);4535 if (!encoding_info) {4536 ext4_msg(sb, KERN_ERR,4537 "Encoding requested by superblock is unknown");4538 return -EINVAL;4539 }4540 4541 encoding = utf8_load(encoding_info->version);4542 if (IS_ERR(encoding)) {4543 ext4_msg(sb, KERN_ERR,4544 "can't mount with superblock charset: %s-%u.%u.%u "4545 "not supported by the kernel. flags: 0x%x.",4546 encoding_info->name,4547 unicode_major(encoding_info->version),4548 unicode_minor(encoding_info->version),4549 unicode_rev(encoding_info->version),4550 encoding_flags);4551 return -EINVAL;4552 }4553 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "4554 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name,4555 unicode_major(encoding_info->version),4556 unicode_minor(encoding_info->version),4557 unicode_rev(encoding_info->version),4558 encoding_flags);4559 4560 sb->s_encoding = encoding;4561 sb->s_encoding_flags = encoding_flags;4562 4563 return 0;4564}4565#else4566static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)4567{4568 return 0;4569}4570#endif4571 4572static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es)4573{4574 struct ext4_sb_info *sbi = EXT4_SB(sb);4575 4576 /* Warn if metadata_csum and gdt_csum are both set. */4577 if (ext4_has_feature_metadata_csum(sb) &&4578 ext4_has_feature_gdt_csum(sb))4579 ext4_warning(sb, "metadata_csum and uninit_bg are "4580 "redundant flags; please run fsck.");4581 4582 /* Check for a known checksum algorithm */4583 if (!ext4_verify_csum_type(sb, es)) {4584 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "4585 "unknown checksum algorithm.");4586 return -EINVAL;4587 }4588 ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,4589 ext4_orphan_file_block_trigger);4590 4591 /* Load the checksum driver */4592 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);4593 if (IS_ERR(sbi->s_chksum_driver)) {4594 int ret = PTR_ERR(sbi->s_chksum_driver);4595 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");4596 sbi->s_chksum_driver = NULL;4597 return ret;4598 }4599 4600 /* Check superblock checksum */4601 if (!ext4_superblock_csum_verify(sb, es)) {4602 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "4603 "invalid superblock checksum. Run e2fsck?");4604 return -EFSBADCRC;4605 }4606 4607 /* Precompute checksum seed for all metadata */4608 if (ext4_has_feature_csum_seed(sb))4609 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);4610 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))4611 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,4612 sizeof(es->s_uuid));4613 return 0;4614}4615 4616static int ext4_check_feature_compatibility(struct super_block *sb,4617 struct ext4_super_block *es,4618 int silent)4619{4620 struct ext4_sb_info *sbi = EXT4_SB(sb);4621 4622 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&4623 (ext4_has_compat_features(sb) ||4624 ext4_has_ro_compat_features(sb) ||4625 ext4_has_incompat_features(sb)))4626 ext4_msg(sb, KERN_WARNING,4627 "feature flags set on rev 0 fs, "4628 "running e2fsck is recommended");4629 4630 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {4631 set_opt2(sb, HURD_COMPAT);4632 if (ext4_has_feature_64bit(sb)) {4633 ext4_msg(sb, KERN_ERR,4634 "The Hurd can't support 64-bit file systems");4635 return -EINVAL;4636 }4637 4638 /*4639 * ea_inode feature uses l_i_version field which is not4640 * available in HURD_COMPAT mode.4641 */4642 if (ext4_has_feature_ea_inode(sb)) {4643 ext4_msg(sb, KERN_ERR,4644 "ea_inode feature is not supported for Hurd");4645 return -EINVAL;4646 }4647 }4648 4649 if (IS_EXT2_SB(sb)) {4650 if (ext2_feature_set_ok(sb))4651 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "4652 "using the ext4 subsystem");4653 else {4654 /*4655 * If we're probing be silent, if this looks like4656 * it's actually an ext[34] filesystem.4657 */4658 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))4659 return -EINVAL;4660 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "4661 "to feature incompatibilities");4662 return -EINVAL;4663 }4664 }4665 4666 if (IS_EXT3_SB(sb)) {4667 if (ext3_feature_set_ok(sb))4668 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "4669 "using the ext4 subsystem");4670 else {4671 /*4672 * If we're probing be silent, if this looks like4673 * it's actually an ext4 filesystem.4674 */4675 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))4676 return -EINVAL;4677 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "4678 "to feature incompatibilities");4679 return -EINVAL;4680 }4681 }4682 4683 /*4684 * Check feature flags regardless of the revision level, since we4685 * previously didn't change the revision level when setting the flags,4686 * so there is a chance incompat flags are set on a rev 0 filesystem.4687 */4688 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))4689 return -EINVAL;4690 4691 if (sbi->s_daxdev) {4692 if (sb->s_blocksize == PAGE_SIZE)4693 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);4694 else4695 ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");4696 }4697 4698 if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {4699 if (ext4_has_feature_inline_data(sb)) {4700 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"4701 " that may contain inline data");4702 return -EINVAL;4703 }4704 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {4705 ext4_msg(sb, KERN_ERR,4706 "DAX unsupported by block device.");4707 return -EINVAL;4708 }4709 }4710 4711 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {4712 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",4713 es->s_encryption_level);4714 return -EINVAL;4715 }4716 4717 return 0;4718}4719 4720static int ext4_check_geometry(struct super_block *sb,4721 struct ext4_super_block *es)4722{4723 struct ext4_sb_info *sbi = EXT4_SB(sb);4724 __u64 blocks_count;4725 int err;4726 4727 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) {4728 ext4_msg(sb, KERN_ERR,4729 "Number of reserved GDT blocks insanely large: %d",4730 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));4731 return -EINVAL;4732 }4733 /*4734 * Test whether we have more sectors than will fit in sector_t,4735 * and whether the max offset is addressable by the page cache.4736 */4737 err = generic_check_addressable(sb->s_blocksize_bits,4738 ext4_blocks_count(es));4739 if (err) {4740 ext4_msg(sb, KERN_ERR, "filesystem"4741 " too large to mount safely on this system");4742 return err;4743 }4744 4745 /* check blocks count against device size */4746 blocks_count = sb_bdev_nr_blocks(sb);4747 if (blocks_count && ext4_blocks_count(es) > blocks_count) {4748 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "4749 "exceeds size of device (%llu blocks)",4750 ext4_blocks_count(es), blocks_count);4751 return -EINVAL;4752 }4753 4754 /*4755 * It makes no sense for the first data block to be beyond the end4756 * of the filesystem.4757 */4758 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {4759 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "4760 "block %u is beyond end of filesystem (%llu)",4761 le32_to_cpu(es->s_first_data_block),4762 ext4_blocks_count(es));4763 return -EINVAL;4764 }4765 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&4766 (sbi->s_cluster_ratio == 1)) {4767 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "4768 "block is 0 with a 1k block and cluster size");4769 return -EINVAL;4770 }4771 4772 blocks_count = (ext4_blocks_count(es) -4773 le32_to_cpu(es->s_first_data_block) +4774 EXT4_BLOCKS_PER_GROUP(sb) - 1);4775 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));4776 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {4777 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "4778 "(block count %llu, first data block %u, "4779 "blocks per group %lu)", blocks_count,4780 ext4_blocks_count(es),4781 le32_to_cpu(es->s_first_data_block),4782 EXT4_BLOCKS_PER_GROUP(sb));4783 return -EINVAL;4784 }4785 sbi->s_groups_count = blocks_count;4786 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,4787 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));4788 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=4789 le32_to_cpu(es->s_inodes_count)) {4790 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",4791 le32_to_cpu(es->s_inodes_count),4792 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));4793 return -EINVAL;4794 }4795 4796 return 0;4797}4798 4799static int ext4_group_desc_init(struct super_block *sb,4800 struct ext4_super_block *es,4801 ext4_fsblk_t logical_sb_block,4802 ext4_group_t *first_not_zeroed)4803{4804 struct ext4_sb_info *sbi = EXT4_SB(sb);4805 unsigned int db_count;4806 ext4_fsblk_t block;4807 int i;4808 4809 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /4810 EXT4_DESC_PER_BLOCK(sb);4811 if (ext4_has_feature_meta_bg(sb)) {4812 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {4813 ext4_msg(sb, KERN_WARNING,4814 "first meta block group too large: %u "4815 "(group descriptor block count %u)",4816 le32_to_cpu(es->s_first_meta_bg), db_count);4817 return -EINVAL;4818 }4819 }4820 rcu_assign_pointer(sbi->s_group_desc,4821 kvmalloc_array(db_count,4822 sizeof(struct buffer_head *),4823 GFP_KERNEL));4824 if (sbi->s_group_desc == NULL) {4825 ext4_msg(sb, KERN_ERR, "not enough memory");4826 return -ENOMEM;4827 }4828 4829 bgl_lock_init(sbi->s_blockgroup_lock);4830 4831 /* Pre-read the descriptors into the buffer cache */4832 for (i = 0; i < db_count; i++) {4833 block = descriptor_loc(sb, logical_sb_block, i);4834 ext4_sb_breadahead_unmovable(sb, block);4835 }4836 4837 for (i = 0; i < db_count; i++) {4838 struct buffer_head *bh;4839 4840 block = descriptor_loc(sb, logical_sb_block, i);4841 bh = ext4_sb_bread_unmovable(sb, block);4842 if (IS_ERR(bh)) {4843 ext4_msg(sb, KERN_ERR,4844 "can't read group descriptor %d", i);4845 sbi->s_gdb_count = i;4846 return PTR_ERR(bh);4847 }4848 rcu_read_lock();4849 rcu_dereference(sbi->s_group_desc)[i] = bh;4850 rcu_read_unlock();4851 }4852 sbi->s_gdb_count = db_count;4853 if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) {4854 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");4855 return -EFSCORRUPTED;4856 }4857 4858 return 0;4859}4860 4861static int ext4_load_and_init_journal(struct super_block *sb,4862 struct ext4_super_block *es,4863 struct ext4_fs_context *ctx)4864{4865 struct ext4_sb_info *sbi = EXT4_SB(sb);4866 int err;4867 4868 err = ext4_load_journal(sb, es, ctx->journal_devnum);4869 if (err)4870 return err;4871 4872 if (ext4_has_feature_64bit(sb) &&4873 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,4874 JBD2_FEATURE_INCOMPAT_64BIT)) {4875 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");4876 goto out;4877 }4878 4879 if (!set_journal_csum_feature_set(sb)) {4880 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "4881 "feature set");4882 goto out;4883 }4884 4885 if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&4886 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,4887 JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {4888 ext4_msg(sb, KERN_ERR,4889 "Failed to set fast commit journal feature");4890 goto out;4891 }4892 4893 /* We have now updated the journal if required, so we can4894 * validate the data journaling mode. */4895 switch (test_opt(sb, DATA_FLAGS)) {4896 case 0:4897 /* No mode set, assume a default based on the journal4898 * capabilities: ORDERED_DATA if the journal can4899 * cope, else JOURNAL_DATA4900 */4901 if (jbd2_journal_check_available_features4902 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {4903 set_opt(sb, ORDERED_DATA);4904 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;4905 } else {4906 set_opt(sb, JOURNAL_DATA);4907 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;4908 }4909 break;4910 4911 case EXT4_MOUNT_ORDERED_DATA:4912 case EXT4_MOUNT_WRITEBACK_DATA:4913 if (!jbd2_journal_check_available_features4914 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {4915 ext4_msg(sb, KERN_ERR, "Journal does not support "4916 "requested data journaling mode");4917 goto out;4918 }4919 break;4920 default:4921 break;4922 }4923 4924 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&4925 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {4926 ext4_msg(sb, KERN_ERR, "can't mount with "4927 "journal_async_commit in data=ordered mode");4928 goto out;4929 }4930 4931 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);4932 4933 sbi->s_journal->j_submit_inode_data_buffers =4934 ext4_journal_submit_inode_data_buffers;4935 sbi->s_journal->j_finish_inode_data_buffers =4936 ext4_journal_finish_inode_data_buffers;4937 4938 return 0;4939 4940out:4941 /* flush s_sb_upd_work before destroying the journal. */4942 flush_work(&sbi->s_sb_upd_work);4943 jbd2_journal_destroy(sbi->s_journal);4944 sbi->s_journal = NULL;4945 return -EINVAL;4946}4947 4948static int ext4_check_journal_data_mode(struct super_block *sb)4949{4950 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {4951 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with "4952 "data=journal disables delayed allocation, "4953 "dioread_nolock, O_DIRECT and fast_commit support!\n");4954 /* can't mount with both data=journal and dioread_nolock. */4955 clear_opt(sb, DIOREAD_NOLOCK);4956 clear_opt2(sb, JOURNAL_FAST_COMMIT);4957 if (test_opt2(sb, EXPLICIT_DELALLOC)) {4958 ext4_msg(sb, KERN_ERR, "can't mount with "4959 "both data=journal and delalloc");4960 return -EINVAL;4961 }4962 if (test_opt(sb, DAX_ALWAYS)) {4963 ext4_msg(sb, KERN_ERR, "can't mount with "4964 "both data=journal and dax");4965 return -EINVAL;4966 }4967 if (ext4_has_feature_encrypt(sb)) {4968 ext4_msg(sb, KERN_WARNING,4969 "encrypted files will use data=ordered "4970 "instead of data journaling mode");4971 }4972 if (test_opt(sb, DELALLOC))4973 clear_opt(sb, DELALLOC);4974 } else {4975 sb->s_iflags |= SB_I_CGROUPWB;4976 }4977 4978 return 0;4979}4980 4981static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb,4982 int silent)4983{4984 struct ext4_sb_info *sbi = EXT4_SB(sb);4985 struct ext4_super_block *es;4986 ext4_fsblk_t logical_sb_block;4987 unsigned long offset = 0;4988 struct buffer_head *bh;4989 int ret = -EINVAL;4990 int blocksize;4991 4992 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);4993 if (!blocksize) {4994 ext4_msg(sb, KERN_ERR, "unable to set blocksize");4995 return -EINVAL;4996 }4997 4998 /*4999 * The ext4 superblock will not be buffer aligned for other than 1kB5000 * block sizes. We need to calculate the offset from buffer start.5001 */5002 if (blocksize != EXT4_MIN_BLOCK_SIZE) {5003 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;5004 offset = do_div(logical_sb_block, blocksize);5005 } else {5006 logical_sb_block = sbi->s_sb_block;5007 }5008 5009 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);5010 if (IS_ERR(bh)) {5011 ext4_msg(sb, KERN_ERR, "unable to read superblock");5012 return PTR_ERR(bh);5013 }5014 /*5015 * Note: s_es must be initialized as soon as possible because5016 * some ext4 macro-instructions depend on its value5017 */5018 es = (struct ext4_super_block *) (bh->b_data + offset);5019 sbi->s_es = es;5020 sb->s_magic = le16_to_cpu(es->s_magic);5021 if (sb->s_magic != EXT4_SUPER_MAGIC) {5022 if (!silent)5023 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");5024 goto out;5025 }5026 5027 if (le32_to_cpu(es->s_log_block_size) >5028 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {5029 ext4_msg(sb, KERN_ERR,5030 "Invalid log block size: %u",5031 le32_to_cpu(es->s_log_block_size));5032 goto out;5033 }5034 if (le32_to_cpu(es->s_log_cluster_size) >5035 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {5036 ext4_msg(sb, KERN_ERR,5037 "Invalid log cluster size: %u",5038 le32_to_cpu(es->s_log_cluster_size));5039 goto out;5040 }5041 5042 blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);5043 5044 /*5045 * If the default block size is not the same as the real block size,5046 * we need to reload it.5047 */5048 if (sb->s_blocksize == blocksize) {5049 *lsb = logical_sb_block;5050 sbi->s_sbh = bh;5051 return 0;5052 }5053 5054 /*5055 * bh must be released before kill_bdev(), otherwise5056 * it won't be freed and its page also. kill_bdev()5057 * is called by sb_set_blocksize().5058 */5059 brelse(bh);5060 /* Validate the filesystem blocksize */5061 if (!sb_set_blocksize(sb, blocksize)) {5062 ext4_msg(sb, KERN_ERR, "bad block size %d",5063 blocksize);5064 bh = NULL;5065 goto out;5066 }5067 5068 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;5069 offset = do_div(logical_sb_block, blocksize);5070 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);5071 if (IS_ERR(bh)) {5072 ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try");5073 ret = PTR_ERR(bh);5074 bh = NULL;5075 goto out;5076 }5077 es = (struct ext4_super_block *)(bh->b_data + offset);5078 sbi->s_es = es;5079 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {5080 ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!");5081 goto out;5082 }5083 *lsb = logical_sb_block;5084 sbi->s_sbh = bh;5085 return 0;5086out:5087 brelse(bh);5088 return ret;5089}5090 5091static int ext4_hash_info_init(struct super_block *sb)5092{5093 struct ext4_sb_info *sbi = EXT4_SB(sb);5094 struct ext4_super_block *es = sbi->s_es;5095 unsigned int i;5096 5097 sbi->s_def_hash_version = es->s_def_hash_version;5098 5099 if (sbi->s_def_hash_version > DX_HASH_LAST) {5100 ext4_msg(sb, KERN_ERR,5101 "Invalid default hash set in the superblock");5102 return -EINVAL;5103 } else if (sbi->s_def_hash_version == DX_HASH_SIPHASH) {5104 ext4_msg(sb, KERN_ERR,5105 "SIPHASH is not a valid default hash value");5106 return -EINVAL;5107 }5108 5109 for (i = 0; i < 4; i++)5110 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);5111 5112 if (ext4_has_feature_dir_index(sb)) {5113 i = le32_to_cpu(es->s_flags);5114 if (i & EXT2_FLAGS_UNSIGNED_HASH)5115 sbi->s_hash_unsigned = 3;5116 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {5117#ifdef __CHAR_UNSIGNED__5118 if (!sb_rdonly(sb))5119 es->s_flags |=5120 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);5121 sbi->s_hash_unsigned = 3;5122#else5123 if (!sb_rdonly(sb))5124 es->s_flags |=5125 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);5126#endif5127 }5128 }5129 return 0;5130}5131 5132static int ext4_block_group_meta_init(struct super_block *sb, int silent)5133{5134 struct ext4_sb_info *sbi = EXT4_SB(sb);5135 struct ext4_super_block *es = sbi->s_es;5136 int has_huge_files;5137 5138 has_huge_files = ext4_has_feature_huge_file(sb);5139 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,5140 has_huge_files);5141 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);5142 5143 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);5144 if (ext4_has_feature_64bit(sb)) {5145 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||5146 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||5147 !is_power_of_2(sbi->s_desc_size)) {5148 ext4_msg(sb, KERN_ERR,5149 "unsupported descriptor size %lu",5150 sbi->s_desc_size);5151 return -EINVAL;5152 }5153 } else5154 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;5155 5156 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);5157 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);5158 5159 sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb);5160 if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) {5161 if (!silent)5162 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");5163 return -EINVAL;5164 }5165 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||5166 sbi->s_inodes_per_group > sb->s_blocksize * 8) {5167 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",5168 sbi->s_inodes_per_group);5169 return -EINVAL;5170 }5171 sbi->s_itb_per_group = sbi->s_inodes_per_group /5172 sbi->s_inodes_per_block;5173 sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb);5174 sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY;5175 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));5176 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));5177 5178 return 0;5179}5180 5181/*5182 * It's hard to get stripe aligned blocks if stripe is not aligned with5183 * cluster, just disable stripe and alert user to simplify code and avoid5184 * stripe aligned allocation which will rarely succeed.5185 */5186static bool ext4_is_stripe_incompatible(struct super_block *sb, unsigned long stripe)5187{5188 struct ext4_sb_info *sbi = EXT4_SB(sb);5189 return (stripe > 0 && sbi->s_cluster_ratio > 1 &&5190 stripe % sbi->s_cluster_ratio != 0);5191}5192 5193static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)5194{5195 struct ext4_super_block *es = NULL;5196 struct ext4_sb_info *sbi = EXT4_SB(sb);5197 ext4_fsblk_t logical_sb_block;5198 struct inode *root;5199 int needs_recovery;5200 int err;5201 ext4_group_t first_not_zeroed;5202 struct ext4_fs_context *ctx = fc->fs_private;5203 int silent = fc->sb_flags & SB_SILENT;5204 5205 /* Set defaults for the variables that will be set during parsing */5206 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO))5207 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;5208 5209 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;5210 sbi->s_sectors_written_start =5211 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);5212 5213 err = ext4_load_super(sb, &logical_sb_block, silent);5214 if (err)5215 goto out_fail;5216 5217 es = sbi->s_es;5218 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);5219 5220 err = ext4_init_metadata_csum(sb, es);5221 if (err)5222 goto failed_mount;5223 5224 ext4_set_def_opts(sb, es);5225 5226 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));5227 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));5228 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;5229 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;5230 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;5231 5232 /*5233 * set default s_li_wait_mult for lazyinit, for the case there is5234 * no mount option specified.5235 */5236 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;5237 5238 err = ext4_inode_info_init(sb, es);5239 if (err)5240 goto failed_mount;5241 5242 err = parse_apply_sb_mount_options(sb, ctx);5243 if (err < 0)5244 goto failed_mount;5245 5246 sbi->s_def_mount_opt = sbi->s_mount_opt;5247 sbi->s_def_mount_opt2 = sbi->s_mount_opt2;5248 5249 err = ext4_check_opt_consistency(fc, sb);5250 if (err < 0)5251 goto failed_mount;5252 5253 ext4_apply_options(fc, sb);5254 5255 err = ext4_encoding_init(sb, es);5256 if (err)5257 goto failed_mount;5258 5259 err = ext4_check_journal_data_mode(sb);5260 if (err)5261 goto failed_mount;5262 5263 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |5264 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);5265 5266 /* i_version is always enabled now */5267 sb->s_flags |= SB_I_VERSION;5268 5269 err = ext4_check_feature_compatibility(sb, es, silent);5270 if (err)5271 goto failed_mount;5272 5273 err = ext4_block_group_meta_init(sb, silent);5274 if (err)5275 goto failed_mount;5276 5277 err = ext4_hash_info_init(sb);5278 if (err)5279 goto failed_mount;5280 5281 err = ext4_handle_clustersize(sb);5282 if (err)5283 goto failed_mount;5284 5285 err = ext4_check_geometry(sb, es);5286 if (err)5287 goto failed_mount;5288 5289 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);5290 spin_lock_init(&sbi->s_error_lock);5291 INIT_WORK(&sbi->s_sb_upd_work, update_super_work);5292 5293 err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed);5294 if (err)5295 goto failed_mount3;5296 5297 err = ext4_es_register_shrinker(sbi);5298 if (err)5299 goto failed_mount3;5300 5301 sbi->s_stripe = ext4_get_stripe_size(sbi);5302 if (ext4_is_stripe_incompatible(sb, sbi->s_stripe)) {5303 ext4_msg(sb, KERN_WARNING,5304 "stripe (%lu) is not aligned with cluster size (%u), "5305 "stripe is disabled",5306 sbi->s_stripe, sbi->s_cluster_ratio);5307 sbi->s_stripe = 0;5308 }5309 sbi->s_extent_max_zeroout_kb = 32;5310 5311 /*5312 * set up enough so that it can read an inode5313 */5314 sb->s_op = &ext4_sops;5315 sb->s_export_op = &ext4_export_ops;5316 sb->s_xattr = ext4_xattr_handlers;5317#ifdef CONFIG_FS_ENCRYPTION5318 sb->s_cop = &ext4_cryptops;5319#endif5320#ifdef CONFIG_FS_VERITY5321 sb->s_vop = &ext4_verityops;5322#endif5323#ifdef CONFIG_QUOTA5324 sb->dq_op = &ext4_quota_operations;5325 if (ext4_has_feature_quota(sb))5326 sb->s_qcop = &dquot_quotactl_sysfile_ops;5327 else5328 sb->s_qcop = &ext4_qctl_operations;5329 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;5330#endif5331 super_set_uuid(sb, es->s_uuid, sizeof(es->s_uuid));5332 super_set_sysfs_name_bdev(sb);5333 5334 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */5335 mutex_init(&sbi->s_orphan_lock);5336 5337 spin_lock_init(&sbi->s_bdev_wb_lock);5338 5339 ext4_fast_commit_init(sb);5340 5341 sb->s_root = NULL;5342 5343 needs_recovery = (es->s_last_orphan != 0 ||5344 ext4_has_feature_orphan_present(sb) ||5345 ext4_has_feature_journal_needs_recovery(sb));5346 5347 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) {5348 err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block));5349 if (err)5350 goto failed_mount3a;5351 }5352 5353 err = -EINVAL;5354 /*5355 * The first inode we look at is the journal inode. Don't try5356 * root first: it may be modified in the journal!5357 */5358 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {5359 err = ext4_load_and_init_journal(sb, es, ctx);5360 if (err)5361 goto failed_mount3a;5362 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&5363 ext4_has_feature_journal_needs_recovery(sb)) {5364 ext4_msg(sb, KERN_ERR, "required journal recovery "5365 "suppressed and not mounted read-only");5366 goto failed_mount3a;5367 } else {5368 /* Nojournal mode, all journal mount options are illegal */5369 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {5370 ext4_msg(sb, KERN_ERR, "can't mount with "5371 "journal_async_commit, fs mounted w/o journal");5372 goto failed_mount3a;5373 }5374 5375 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {5376 ext4_msg(sb, KERN_ERR, "can't mount with "5377 "journal_checksum, fs mounted w/o journal");5378 goto failed_mount3a;5379 }5380 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {5381 ext4_msg(sb, KERN_ERR, "can't mount with "5382 "commit=%lu, fs mounted w/o journal",5383 sbi->s_commit_interval / HZ);5384 goto failed_mount3a;5385 }5386 if (EXT4_MOUNT_DATA_FLAGS &5387 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {5388 ext4_msg(sb, KERN_ERR, "can't mount with "5389 "data=, fs mounted w/o journal");5390 goto failed_mount3a;5391 }5392 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;5393 clear_opt(sb, JOURNAL_CHECKSUM);5394 clear_opt(sb, DATA_FLAGS);5395 clear_opt2(sb, JOURNAL_FAST_COMMIT);5396 sbi->s_journal = NULL;5397 needs_recovery = 0;5398 }5399 5400 if (!test_opt(sb, NO_MBCACHE)) {5401 sbi->s_ea_block_cache = ext4_xattr_create_cache();5402 if (!sbi->s_ea_block_cache) {5403 ext4_msg(sb, KERN_ERR,5404 "Failed to create ea_block_cache");5405 err = -EINVAL;5406 goto failed_mount_wq;5407 }5408 5409 if (ext4_has_feature_ea_inode(sb)) {5410 sbi->s_ea_inode_cache = ext4_xattr_create_cache();5411 if (!sbi->s_ea_inode_cache) {5412 ext4_msg(sb, KERN_ERR,5413 "Failed to create ea_inode_cache");5414 err = -EINVAL;5415 goto failed_mount_wq;5416 }5417 }5418 }5419 5420 /*5421 * Get the # of file system overhead blocks from the5422 * superblock if present.5423 */5424 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);5425 /* ignore the precalculated value if it is ridiculous */5426 if (sbi->s_overhead > ext4_blocks_count(es))5427 sbi->s_overhead = 0;5428 /*5429 * If the bigalloc feature is not enabled recalculating the5430 * overhead doesn't take long, so we might as well just redo5431 * it to make sure we are using the correct value.5432 */5433 if (!ext4_has_feature_bigalloc(sb))5434 sbi->s_overhead = 0;5435 if (sbi->s_overhead == 0) {5436 err = ext4_calculate_overhead(sb);5437 if (err)5438 goto failed_mount_wq;5439 }5440 5441 /*5442 * The maximum number of concurrent works can be high and5443 * concurrency isn't really necessary. Limit it to 1.5444 */5445 EXT4_SB(sb)->rsv_conversion_wq =5446 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);5447 if (!EXT4_SB(sb)->rsv_conversion_wq) {5448 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");5449 err = -ENOMEM;5450 goto failed_mount4;5451 }5452 5453 /*5454 * The jbd2_journal_load will have done any necessary log recovery,5455 * so we can safely mount the rest of the filesystem now.5456 */5457 5458 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);5459 if (IS_ERR(root)) {5460 ext4_msg(sb, KERN_ERR, "get root inode failed");5461 err = PTR_ERR(root);5462 root = NULL;5463 goto failed_mount4;5464 }5465 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {5466 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");5467 iput(root);5468 err = -EFSCORRUPTED;5469 goto failed_mount4;5470 }5471 5472 generic_set_sb_d_ops(sb);5473 sb->s_root = d_make_root(root);5474 if (!sb->s_root) {5475 ext4_msg(sb, KERN_ERR, "get root dentry failed");5476 err = -ENOMEM;5477 goto failed_mount4;5478 }5479 5480 err = ext4_setup_super(sb, es, sb_rdonly(sb));5481 if (err == -EROFS) {5482 sb->s_flags |= SB_RDONLY;5483 } else if (err)5484 goto failed_mount4a;5485 5486 ext4_set_resv_clusters(sb);5487 5488 if (test_opt(sb, BLOCK_VALIDITY)) {5489 err = ext4_setup_system_zone(sb);5490 if (err) {5491 ext4_msg(sb, KERN_ERR, "failed to initialize system "5492 "zone (%d)", err);5493 goto failed_mount4a;5494 }5495 }5496 ext4_fc_replay_cleanup(sb);5497 5498 ext4_ext_init(sb);5499 5500 /*5501 * Enable optimize_scan if number of groups is > threshold. This can be5502 * turned off by passing "mb_optimize_scan=0". This can also be5503 * turned on forcefully by passing "mb_optimize_scan=1".5504 */5505 if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) {5506 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)5507 set_opt2(sb, MB_OPTIMIZE_SCAN);5508 else5509 clear_opt2(sb, MB_OPTIMIZE_SCAN);5510 }5511 5512 err = ext4_mb_init(sb);5513 if (err) {5514 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",5515 err);5516 goto failed_mount5;5517 }5518 5519 /*5520 * We can only set up the journal commit callback once5521 * mballoc is initialized5522 */5523 if (sbi->s_journal)5524 sbi->s_journal->j_commit_callback =5525 ext4_journal_commit_callback;5526 5527 err = ext4_percpu_param_init(sbi);5528 if (err)5529 goto failed_mount6;5530 5531 if (ext4_has_feature_flex_bg(sb))5532 if (!ext4_fill_flex_info(sb)) {5533 ext4_msg(sb, KERN_ERR,5534 "unable to initialize "5535 "flex_bg meta info!");5536 err = -ENOMEM;5537 goto failed_mount6;5538 }5539 5540 err = ext4_register_li_request(sb, first_not_zeroed);5541 if (err)5542 goto failed_mount6;5543 5544 err = ext4_init_orphan_info(sb);5545 if (err)5546 goto failed_mount7;5547#ifdef CONFIG_QUOTA5548 /* Enable quota usage during mount. */5549 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {5550 err = ext4_enable_quotas(sb);5551 if (err)5552 goto failed_mount8;5553 }5554#endif /* CONFIG_QUOTA */5555 5556 /*5557 * Save the original bdev mapping's wb_err value which could be5558 * used to detect the metadata async write error.5559 */5560 errseq_check_and_advance(&sb->s_bdev->bd_mapping->wb_err,5561 &sbi->s_bdev_wb_err);5562 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;5563 ext4_orphan_cleanup(sb, es);5564 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;5565 /*5566 * Update the checksum after updating free space/inode counters and5567 * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect5568 * checksum in the buffer cache until it is written out and5569 * e2fsprogs programs trying to open a file system immediately5570 * after it is mounted can fail.5571 */5572 ext4_superblock_csum_set(sb);5573 if (needs_recovery) {5574 ext4_msg(sb, KERN_INFO, "recovery complete");5575 err = ext4_mark_recovery_complete(sb, es);5576 if (err)5577 goto failed_mount9;5578 }5579 5580 if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev))5581 ext4_msg(sb, KERN_WARNING,5582 "mounting with \"discard\" option, but the device does not support discard");5583 5584 if (es->s_error_count)5585 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */5586 5587 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */5588 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);5589 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);5590 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);5591 atomic_set(&sbi->s_warning_count, 0);5592 atomic_set(&sbi->s_msg_count, 0);5593 5594 /* Register sysfs after all initializations are complete. */5595 err = ext4_register_sysfs(sb);5596 if (err)5597 goto failed_mount9;5598 5599 return 0;5600 5601failed_mount9:5602 ext4_quotas_off(sb, EXT4_MAXQUOTAS);5603failed_mount8: __maybe_unused5604 ext4_release_orphan_info(sb);5605failed_mount7:5606 ext4_unregister_li_request(sb);5607failed_mount6:5608 ext4_mb_release(sb);5609 ext4_flex_groups_free(sbi);5610 ext4_percpu_param_destroy(sbi);5611failed_mount5:5612 ext4_ext_release(sb);5613 ext4_release_system_zone(sb);5614failed_mount4a:5615 dput(sb->s_root);5616 sb->s_root = NULL;5617failed_mount4:5618 ext4_msg(sb, KERN_ERR, "mount failed");5619 if (EXT4_SB(sb)->rsv_conversion_wq)5620 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);5621failed_mount_wq:5622 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);5623 sbi->s_ea_inode_cache = NULL;5624 5625 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);5626 sbi->s_ea_block_cache = NULL;5627 5628 if (sbi->s_journal) {5629 /* flush s_sb_upd_work before journal destroy. */5630 flush_work(&sbi->s_sb_upd_work);5631 jbd2_journal_destroy(sbi->s_journal);5632 sbi->s_journal = NULL;5633 }5634failed_mount3a:5635 ext4_es_unregister_shrinker(sbi);5636failed_mount3:5637 /* flush s_sb_upd_work before sbi destroy */5638 flush_work(&sbi->s_sb_upd_work);5639 ext4_stop_mmpd(sbi);5640 del_timer_sync(&sbi->s_err_report);5641 ext4_group_desc_free(sbi);5642failed_mount:5643 if (sbi->s_chksum_driver)5644 crypto_free_shash(sbi->s_chksum_driver);5645 5646#if IS_ENABLED(CONFIG_UNICODE)5647 utf8_unload(sb->s_encoding);5648#endif5649 5650#ifdef CONFIG_QUOTA5651 for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++)5652 kfree(get_qf_name(sb, sbi, i));5653#endif5654 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);5655 brelse(sbi->s_sbh);5656 if (sbi->s_journal_bdev_file) {5657 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file));5658 bdev_fput(sbi->s_journal_bdev_file);5659 }5660out_fail:5661 invalidate_bdev(sb->s_bdev);5662 sb->s_fs_info = NULL;5663 return err;5664}5665 5666static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)5667{5668 struct ext4_fs_context *ctx = fc->fs_private;5669 struct ext4_sb_info *sbi;5670 const char *descr;5671 int ret;5672 5673 sbi = ext4_alloc_sbi(sb);5674 if (!sbi)5675 return -ENOMEM;5676 5677 fc->s_fs_info = sbi;5678 5679 /* Cleanup superblock name */5680 strreplace(sb->s_id, '/', '!');5681 5682 sbi->s_sb_block = 1; /* Default super block location */5683 if (ctx->spec & EXT4_SPEC_s_sb_block)5684 sbi->s_sb_block = ctx->s_sb_block;5685 5686 ret = __ext4_fill_super(fc, sb);5687 if (ret < 0)5688 goto free_sbi;5689 5690 if (sbi->s_journal) {5691 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)5692 descr = " journalled data mode";5693 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)5694 descr = " ordered data mode";5695 else5696 descr = " writeback data mode";5697 } else5698 descr = "out journal";5699 5700 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))5701 ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. "5702 "Quota mode: %s.", &sb->s_uuid,5703 sb_rdonly(sb) ? "ro" : "r/w", descr,5704 ext4_quota_mode(sb));5705 5706 /* Update the s_overhead_clusters if necessary */5707 ext4_update_overhead(sb, false);5708 return 0;5709 5710free_sbi:5711 ext4_free_sbi(sbi);5712 fc->s_fs_info = NULL;5713 return ret;5714}5715 5716static int ext4_get_tree(struct fs_context *fc)5717{5718 return get_tree_bdev(fc, ext4_fill_super);5719}5720 5721/*5722 * Setup any per-fs journal parameters now. We'll do this both on5723 * initial mount, once the journal has been initialised but before we've5724 * done any recovery; and again on any subsequent remount.5725 */5726static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)5727{5728 struct ext4_sb_info *sbi = EXT4_SB(sb);5729 5730 journal->j_commit_interval = sbi->s_commit_interval;5731 journal->j_min_batch_time = sbi->s_min_batch_time;5732 journal->j_max_batch_time = sbi->s_max_batch_time;5733 ext4_fc_init(sb, journal);5734 5735 write_lock(&journal->j_state_lock);5736 if (test_opt(sb, BARRIER))5737 journal->j_flags |= JBD2_BARRIER;5738 else5739 journal->j_flags &= ~JBD2_BARRIER;5740 if (test_opt(sb, DATA_ERR_ABORT))5741 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;5742 else5743 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;5744 /*5745 * Always enable journal cycle record option, letting the journal5746 * records log transactions continuously between each mount.5747 */5748 journal->j_flags |= JBD2_CYCLE_RECORD;5749 write_unlock(&journal->j_state_lock);5750}5751 5752static struct inode *ext4_get_journal_inode(struct super_block *sb,5753 unsigned int journal_inum)5754{5755 struct inode *journal_inode;5756 5757 /*5758 * Test for the existence of a valid inode on disk. Bad things5759 * happen if we iget() an unused inode, as the subsequent iput()5760 * will try to delete it.5761 */5762 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);5763 if (IS_ERR(journal_inode)) {5764 ext4_msg(sb, KERN_ERR, "no journal found");5765 return ERR_CAST(journal_inode);5766 }5767 if (!journal_inode->i_nlink) {5768 make_bad_inode(journal_inode);5769 iput(journal_inode);5770 ext4_msg(sb, KERN_ERR, "journal inode is deleted");5771 return ERR_PTR(-EFSCORRUPTED);5772 }5773 if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) {5774 ext4_msg(sb, KERN_ERR, "invalid journal inode");5775 iput(journal_inode);5776 return ERR_PTR(-EFSCORRUPTED);5777 }5778 5779 ext4_debug("Journal inode found at %p: %lld bytes\n",5780 journal_inode, journal_inode->i_size);5781 return journal_inode;5782}5783 5784static int ext4_journal_bmap(journal_t *journal, sector_t *block)5785{5786 struct ext4_map_blocks map;5787 int ret;5788 5789 if (journal->j_inode == NULL)5790 return 0;5791 5792 map.m_lblk = *block;5793 map.m_len = 1;5794 ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0);5795 if (ret <= 0) {5796 ext4_msg(journal->j_inode->i_sb, KERN_CRIT,5797 "journal bmap failed: block %llu ret %d\n",5798 *block, ret);5799 jbd2_journal_abort(journal, ret ? ret : -EIO);5800 return ret;5801 }5802 *block = map.m_pblk;5803 return 0;5804}5805 5806static journal_t *ext4_open_inode_journal(struct super_block *sb,5807 unsigned int journal_inum)5808{5809 struct inode *journal_inode;5810 journal_t *journal;5811 5812 journal_inode = ext4_get_journal_inode(sb, journal_inum);5813 if (IS_ERR(journal_inode))5814 return ERR_CAST(journal_inode);5815 5816 journal = jbd2_journal_init_inode(journal_inode);5817 if (IS_ERR(journal)) {5818 ext4_msg(sb, KERN_ERR, "Could not load journal inode");5819 iput(journal_inode);5820 return ERR_CAST(journal);5821 }5822 journal->j_private = sb;5823 journal->j_bmap = ext4_journal_bmap;5824 ext4_init_journal_params(sb, journal);5825 return journal;5826}5827 5828static struct file *ext4_get_journal_blkdev(struct super_block *sb,5829 dev_t j_dev, ext4_fsblk_t *j_start,5830 ext4_fsblk_t *j_len)5831{5832 struct buffer_head *bh;5833 struct block_device *bdev;5834 struct file *bdev_file;5835 int hblock, blocksize;5836 ext4_fsblk_t sb_block;5837 unsigned long offset;5838 struct ext4_super_block *es;5839 int errno;5840 5841 bdev_file = bdev_file_open_by_dev(j_dev,5842 BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,5843 sb, &fs_holder_ops);5844 if (IS_ERR(bdev_file)) {5845 ext4_msg(sb, KERN_ERR,5846 "failed to open journal device unknown-block(%u,%u) %ld",5847 MAJOR(j_dev), MINOR(j_dev), PTR_ERR(bdev_file));5848 return bdev_file;5849 }5850 5851 bdev = file_bdev(bdev_file);5852 blocksize = sb->s_blocksize;5853 hblock = bdev_logical_block_size(bdev);5854 if (blocksize < hblock) {5855 ext4_msg(sb, KERN_ERR,5856 "blocksize too small for journal device");5857 errno = -EINVAL;5858 goto out_bdev;5859 }5860 5861 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;5862 offset = EXT4_MIN_BLOCK_SIZE % blocksize;5863 set_blocksize(bdev_file, blocksize);5864 bh = __bread(bdev, sb_block, blocksize);5865 if (!bh) {5866 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "5867 "external journal");5868 errno = -EINVAL;5869 goto out_bdev;5870 }5871 5872 es = (struct ext4_super_block *) (bh->b_data + offset);5873 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||5874 !(le32_to_cpu(es->s_feature_incompat) &5875 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {5876 ext4_msg(sb, KERN_ERR, "external journal has bad superblock");5877 errno = -EFSCORRUPTED;5878 goto out_bh;5879 }5880 5881 if ((le32_to_cpu(es->s_feature_ro_compat) &5882 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&5883 es->s_checksum != ext4_superblock_csum(sb, es)) {5884 ext4_msg(sb, KERN_ERR, "external journal has corrupt superblock");5885 errno = -EFSCORRUPTED;5886 goto out_bh;5887 }5888 5889 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {5890 ext4_msg(sb, KERN_ERR, "journal UUID does not match");5891 errno = -EFSCORRUPTED;5892 goto out_bh;5893 }5894 5895 *j_start = sb_block + 1;5896 *j_len = ext4_blocks_count(es);5897 brelse(bh);5898 return bdev_file;5899 5900out_bh:5901 brelse(bh);5902out_bdev:5903 bdev_fput(bdev_file);5904 return ERR_PTR(errno);5905}5906 5907static journal_t *ext4_open_dev_journal(struct super_block *sb,5908 dev_t j_dev)5909{5910 journal_t *journal;5911 ext4_fsblk_t j_start;5912 ext4_fsblk_t j_len;5913 struct file *bdev_file;5914 int errno = 0;5915 5916 bdev_file = ext4_get_journal_blkdev(sb, j_dev, &j_start, &j_len);5917 if (IS_ERR(bdev_file))5918 return ERR_CAST(bdev_file);5919 5920 journal = jbd2_journal_init_dev(file_bdev(bdev_file), sb->s_bdev, j_start,5921 j_len, sb->s_blocksize);5922 if (IS_ERR(journal)) {5923 ext4_msg(sb, KERN_ERR, "failed to create device journal");5924 errno = PTR_ERR(journal);5925 goto out_bdev;5926 }5927 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {5928 ext4_msg(sb, KERN_ERR, "External journal has more than one "5929 "user (unsupported) - %d",5930 be32_to_cpu(journal->j_superblock->s_nr_users));5931 errno = -EINVAL;5932 goto out_journal;5933 }5934 journal->j_private = sb;5935 EXT4_SB(sb)->s_journal_bdev_file = bdev_file;5936 ext4_init_journal_params(sb, journal);5937 return journal;5938 5939out_journal:5940 jbd2_journal_destroy(journal);5941out_bdev:5942 bdev_fput(bdev_file);5943 return ERR_PTR(errno);5944}5945 5946static int ext4_load_journal(struct super_block *sb,5947 struct ext4_super_block *es,5948 unsigned long journal_devnum)5949{5950 journal_t *journal;5951 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);5952 dev_t journal_dev;5953 int err = 0;5954 int really_read_only;5955 int journal_dev_ro;5956 5957 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))5958 return -EFSCORRUPTED;5959 5960 if (journal_devnum &&5961 journal_devnum != le32_to_cpu(es->s_journal_dev)) {5962 ext4_msg(sb, KERN_INFO, "external journal device major/minor "5963 "numbers have changed");5964 journal_dev = new_decode_dev(journal_devnum);5965 } else5966 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));5967 5968 if (journal_inum && journal_dev) {5969 ext4_msg(sb, KERN_ERR,5970 "filesystem has both journal inode and journal device!");5971 return -EINVAL;5972 }5973 5974 if (journal_inum) {5975 journal = ext4_open_inode_journal(sb, journal_inum);5976 if (IS_ERR(journal))5977 return PTR_ERR(journal);5978 } else {5979 journal = ext4_open_dev_journal(sb, journal_dev);5980 if (IS_ERR(journal))5981 return PTR_ERR(journal);5982 }5983 5984 journal_dev_ro = bdev_read_only(journal->j_dev);5985 really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;5986 5987 if (journal_dev_ro && !sb_rdonly(sb)) {5988 ext4_msg(sb, KERN_ERR,5989 "journal device read-only, try mounting with '-o ro'");5990 err = -EROFS;5991 goto err_out;5992 }5993 5994 /*5995 * Are we loading a blank journal or performing recovery after a5996 * crash? For recovery, we need to check in advance whether we5997 * can get read-write access to the device.5998 */5999 if (ext4_has_feature_journal_needs_recovery(sb)) {6000 if (sb_rdonly(sb)) {6001 ext4_msg(sb, KERN_INFO, "INFO: recovery "6002 "required on readonly filesystem");6003 if (really_read_only) {6004 ext4_msg(sb, KERN_ERR, "write access "6005 "unavailable, cannot proceed "6006 "(try mounting with noload)");6007 err = -EROFS;6008 goto err_out;6009 }6010 ext4_msg(sb, KERN_INFO, "write access will "6011 "be enabled during recovery");6012 }6013 }6014 6015 if (!(journal->j_flags & JBD2_BARRIER))6016 ext4_msg(sb, KERN_INFO, "barriers disabled");6017 6018 if (!ext4_has_feature_journal_needs_recovery(sb))6019 err = jbd2_journal_wipe(journal, !really_read_only);6020 if (!err) {6021 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);6022 __le16 orig_state;6023 bool changed = false;6024 6025 if (save)6026 memcpy(save, ((char *) es) +6027 EXT4_S_ERR_START, EXT4_S_ERR_LEN);6028 err = jbd2_journal_load(journal);6029 if (save && memcmp(((char *) es) + EXT4_S_ERR_START,6030 save, EXT4_S_ERR_LEN)) {6031 memcpy(((char *) es) + EXT4_S_ERR_START,6032 save, EXT4_S_ERR_LEN);6033 changed = true;6034 }6035 kfree(save);6036 orig_state = es->s_state;6037 es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &6038 EXT4_ERROR_FS);6039 if (orig_state != es->s_state)6040 changed = true;6041 /* Write out restored error information to the superblock */6042 if (changed && !really_read_only) {6043 int err2;6044 err2 = ext4_commit_super(sb);6045 err = err ? : err2;6046 }6047 }6048 6049 if (err) {6050 ext4_msg(sb, KERN_ERR, "error loading journal");6051 goto err_out;6052 }6053 6054 EXT4_SB(sb)->s_journal = journal;6055 err = ext4_clear_journal_err(sb, es);6056 if (err) {6057 EXT4_SB(sb)->s_journal = NULL;6058 jbd2_journal_destroy(journal);6059 return err;6060 }6061 6062 if (!really_read_only && journal_devnum &&6063 journal_devnum != le32_to_cpu(es->s_journal_dev)) {6064 es->s_journal_dev = cpu_to_le32(journal_devnum);6065 ext4_commit_super(sb);6066 }6067 if (!really_read_only && journal_inum &&6068 journal_inum != le32_to_cpu(es->s_journal_inum)) {6069 es->s_journal_inum = cpu_to_le32(journal_inum);6070 ext4_commit_super(sb);6071 }6072 6073 return 0;6074 6075err_out:6076 jbd2_journal_destroy(journal);6077 return err;6078}6079 6080/* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */6081static void ext4_update_super(struct super_block *sb)6082{6083 struct ext4_sb_info *sbi = EXT4_SB(sb);6084 struct ext4_super_block *es = sbi->s_es;6085 struct buffer_head *sbh = sbi->s_sbh;6086 6087 lock_buffer(sbh);6088 /*6089 * If the file system is mounted read-only, don't update the6090 * superblock write time. This avoids updating the superblock6091 * write time when we are mounting the root file system6092 * read/only but we need to replay the journal; at that point,6093 * for people who are east of GMT and who make their clock6094 * tick in localtime for Windows bug-for-bug compatibility,6095 * the clock is set in the future, and this will cause e2fsck6096 * to complain and force a full file system check.6097 */6098 if (!sb_rdonly(sb))6099 ext4_update_tstamp(es, s_wtime);6100 es->s_kbytes_written =6101 cpu_to_le64(sbi->s_kbytes_written +6102 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -6103 sbi->s_sectors_written_start) >> 1));6104 if (percpu_counter_initialized(&sbi->s_freeclusters_counter))6105 ext4_free_blocks_count_set(es,6106 EXT4_C2B(sbi, percpu_counter_sum_positive(6107 &sbi->s_freeclusters_counter)));6108 if (percpu_counter_initialized(&sbi->s_freeinodes_counter))6109 es->s_free_inodes_count =6110 cpu_to_le32(percpu_counter_sum_positive(6111 &sbi->s_freeinodes_counter));6112 /* Copy error information to the on-disk superblock */6113 spin_lock(&sbi->s_error_lock);6114 if (sbi->s_add_error_count > 0) {6115 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);6116 if (!es->s_first_error_time && !es->s_first_error_time_hi) {6117 __ext4_update_tstamp(&es->s_first_error_time,6118 &es->s_first_error_time_hi,6119 sbi->s_first_error_time);6120 strtomem_pad(es->s_first_error_func,6121 sbi->s_first_error_func, 0);6122 es->s_first_error_line =6123 cpu_to_le32(sbi->s_first_error_line);6124 es->s_first_error_ino =6125 cpu_to_le32(sbi->s_first_error_ino);6126 es->s_first_error_block =6127 cpu_to_le64(sbi->s_first_error_block);6128 es->s_first_error_errcode =6129 ext4_errno_to_code(sbi->s_first_error_code);6130 }6131 __ext4_update_tstamp(&es->s_last_error_time,6132 &es->s_last_error_time_hi,6133 sbi->s_last_error_time);6134 strtomem_pad(es->s_last_error_func, sbi->s_last_error_func, 0);6135 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);6136 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);6137 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);6138 es->s_last_error_errcode =6139 ext4_errno_to_code(sbi->s_last_error_code);6140 /*6141 * Start the daily error reporting function if it hasn't been6142 * started already6143 */6144 if (!es->s_error_count)6145 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);6146 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);6147 sbi->s_add_error_count = 0;6148 }6149 spin_unlock(&sbi->s_error_lock);6150 6151 ext4_superblock_csum_set(sb);6152 unlock_buffer(sbh);6153}6154 6155static int ext4_commit_super(struct super_block *sb)6156{6157 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;6158 6159 if (!sbh)6160 return -EINVAL;6161 6162 ext4_update_super(sb);6163 6164 lock_buffer(sbh);6165 /* Buffer got discarded which means block device got invalidated */6166 if (!buffer_mapped(sbh)) {6167 unlock_buffer(sbh);6168 return -EIO;6169 }6170 6171 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {6172 /*6173 * Oh, dear. A previous attempt to write the6174 * superblock failed. This could happen because the6175 * USB device was yanked out. Or it could happen to6176 * be a transient write error and maybe the block will6177 * be remapped. Nothing we can do but to retry the6178 * write and hope for the best.6179 */6180 ext4_msg(sb, KERN_ERR, "previous I/O error to "6181 "superblock detected");6182 clear_buffer_write_io_error(sbh);6183 set_buffer_uptodate(sbh);6184 }6185 get_bh(sbh);6186 /* Clear potential dirty bit if it was journalled update */6187 clear_buffer_dirty(sbh);6188 sbh->b_end_io = end_buffer_write_sync;6189 submit_bh(REQ_OP_WRITE | REQ_SYNC |6190 (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);6191 wait_on_buffer(sbh);6192 if (buffer_write_io_error(sbh)) {6193 ext4_msg(sb, KERN_ERR, "I/O error while writing "6194 "superblock");6195 clear_buffer_write_io_error(sbh);6196 set_buffer_uptodate(sbh);6197 return -EIO;6198 }6199 return 0;6200}6201 6202/*6203 * Have we just finished recovery? If so, and if we are mounting (or6204 * remounting) the filesystem readonly, then we will end up with a6205 * consistent fs on disk. Record that fact.6206 */6207static int ext4_mark_recovery_complete(struct super_block *sb,6208 struct ext4_super_block *es)6209{6210 int err;6211 journal_t *journal = EXT4_SB(sb)->s_journal;6212 6213 if (!ext4_has_feature_journal(sb)) {6214 if (journal != NULL) {6215 ext4_error(sb, "Journal got removed while the fs was "6216 "mounted!");6217 return -EFSCORRUPTED;6218 }6219 return 0;6220 }6221 jbd2_journal_lock_updates(journal);6222 err = jbd2_journal_flush(journal, 0);6223 if (err < 0)6224 goto out;6225 6226 if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||6227 ext4_has_feature_orphan_present(sb))) {6228 if (!ext4_orphan_file_empty(sb)) {6229 ext4_error(sb, "Orphan file not empty on read-only fs.");6230 err = -EFSCORRUPTED;6231 goto out;6232 }6233 ext4_clear_feature_journal_needs_recovery(sb);6234 ext4_clear_feature_orphan_present(sb);6235 ext4_commit_super(sb);6236 }6237out:6238 jbd2_journal_unlock_updates(journal);6239 return err;6240}6241 6242/*6243 * If we are mounting (or read-write remounting) a filesystem whose journal6244 * has recorded an error from a previous lifetime, move that error to the6245 * main filesystem now.6246 */6247static int ext4_clear_journal_err(struct super_block *sb,6248 struct ext4_super_block *es)6249{6250 journal_t *journal;6251 int j_errno;6252 const char *errstr;6253 6254 if (!ext4_has_feature_journal(sb)) {6255 ext4_error(sb, "Journal got removed while the fs was mounted!");6256 return -EFSCORRUPTED;6257 }6258 6259 journal = EXT4_SB(sb)->s_journal;6260 6261 /*6262 * Now check for any error status which may have been recorded in the6263 * journal by a prior ext4_error() or ext4_abort()6264 */6265 6266 j_errno = jbd2_journal_errno(journal);6267 if (j_errno) {6268 char nbuf[16];6269 6270 errstr = ext4_decode_error(sb, j_errno, nbuf);6271 ext4_warning(sb, "Filesystem error recorded "6272 "from previous mount: %s", errstr);6273 6274 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;6275 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);6276 j_errno = ext4_commit_super(sb);6277 if (j_errno)6278 return j_errno;6279 ext4_warning(sb, "Marked fs in need of filesystem check.");6280 6281 jbd2_journal_clear_err(journal);6282 jbd2_journal_update_sb_errno(journal);6283 }6284 return 0;6285}6286 6287/*6288 * Force the running and committing transactions to commit,6289 * and wait on the commit.6290 */6291int ext4_force_commit(struct super_block *sb)6292{6293 return ext4_journal_force_commit(EXT4_SB(sb)->s_journal);6294}6295 6296static int ext4_sync_fs(struct super_block *sb, int wait)6297{6298 int ret = 0;6299 tid_t target;6300 bool needs_barrier = false;6301 struct ext4_sb_info *sbi = EXT4_SB(sb);6302 6303 if (unlikely(ext4_forced_shutdown(sb)))6304 return 0;6305 6306 trace_ext4_sync_fs(sb, wait);6307 flush_workqueue(sbi->rsv_conversion_wq);6308 /*6309 * Writeback quota in non-journalled quota case - journalled quota has6310 * no dirty dquots6311 */6312 dquot_writeback_dquots(sb, -1);6313 /*6314 * Data writeback is possible w/o journal transaction, so barrier must6315 * being sent at the end of the function. But we can skip it if6316 * transaction_commit will do it for us.6317 */6318 if (sbi->s_journal) {6319 target = jbd2_get_latest_transaction(sbi->s_journal);6320 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&6321 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))6322 needs_barrier = true;6323 6324 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {6325 if (wait)6326 ret = jbd2_log_wait_commit(sbi->s_journal,6327 target);6328 }6329 } else if (wait && test_opt(sb, BARRIER))6330 needs_barrier = true;6331 if (needs_barrier) {6332 int err;6333 err = blkdev_issue_flush(sb->s_bdev);6334 if (!ret)6335 ret = err;6336 }6337 6338 return ret;6339}6340 6341/*6342 * LVM calls this function before a (read-only) snapshot is created. This6343 * gives us a chance to flush the journal completely and mark the fs clean.6344 *6345 * Note that only this function cannot bring a filesystem to be in a clean6346 * state independently. It relies on upper layer to stop all data & metadata6347 * modifications.6348 */6349static int ext4_freeze(struct super_block *sb)6350{6351 int error = 0;6352 journal_t *journal = EXT4_SB(sb)->s_journal;6353 6354 if (journal) {6355 /* Now we set up the journal barrier. */6356 jbd2_journal_lock_updates(journal);6357 6358 /*6359 * Don't clear the needs_recovery flag if we failed to6360 * flush the journal.6361 */6362 error = jbd2_journal_flush(journal, 0);6363 if (error < 0)6364 goto out;6365 6366 /* Journal blocked and flushed, clear needs_recovery flag. */6367 ext4_clear_feature_journal_needs_recovery(sb);6368 if (ext4_orphan_file_empty(sb))6369 ext4_clear_feature_orphan_present(sb);6370 }6371 6372 error = ext4_commit_super(sb);6373out:6374 if (journal)6375 /* we rely on upper layer to stop further updates */6376 jbd2_journal_unlock_updates(journal);6377 return error;6378}6379 6380/*6381 * Called by LVM after the snapshot is done. We need to reset the RECOVER6382 * flag here, even though the filesystem is not technically dirty yet.6383 */6384static int ext4_unfreeze(struct super_block *sb)6385{6386 if (ext4_forced_shutdown(sb))6387 return 0;6388 6389 if (EXT4_SB(sb)->s_journal) {6390 /* Reset the needs_recovery flag before the fs is unlocked. */6391 ext4_set_feature_journal_needs_recovery(sb);6392 if (ext4_has_feature_orphan_file(sb))6393 ext4_set_feature_orphan_present(sb);6394 }6395 6396 ext4_commit_super(sb);6397 return 0;6398}6399 6400/*6401 * Structure to save mount options for ext4_remount's benefit6402 */6403struct ext4_mount_options {6404 unsigned long s_mount_opt;6405 unsigned long s_mount_opt2;6406 kuid_t s_resuid;6407 kgid_t s_resgid;6408 unsigned long s_commit_interval;6409 u32 s_min_batch_time, s_max_batch_time;6410#ifdef CONFIG_QUOTA6411 int s_jquota_fmt;6412 char *s_qf_names[EXT4_MAXQUOTAS];6413#endif6414};6415 6416static int __ext4_remount(struct fs_context *fc, struct super_block *sb)6417{6418 struct ext4_fs_context *ctx = fc->fs_private;6419 struct ext4_super_block *es;6420 struct ext4_sb_info *sbi = EXT4_SB(sb);6421 unsigned long old_sb_flags;6422 struct ext4_mount_options old_opts;6423 ext4_group_t g;6424 int err = 0;6425 int alloc_ctx;6426#ifdef CONFIG_QUOTA6427 int enable_quota = 0;6428 int i, j;6429 char *to_free[EXT4_MAXQUOTAS];6430#endif6431 6432 6433 /* Store the original options */6434 old_sb_flags = sb->s_flags;6435 old_opts.s_mount_opt = sbi->s_mount_opt;6436 old_opts.s_mount_opt2 = sbi->s_mount_opt2;6437 old_opts.s_resuid = sbi->s_resuid;6438 old_opts.s_resgid = sbi->s_resgid;6439 old_opts.s_commit_interval = sbi->s_commit_interval;6440 old_opts.s_min_batch_time = sbi->s_min_batch_time;6441 old_opts.s_max_batch_time = sbi->s_max_batch_time;6442#ifdef CONFIG_QUOTA6443 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;6444 for (i = 0; i < EXT4_MAXQUOTAS; i++)6445 if (sbi->s_qf_names[i]) {6446 char *qf_name = get_qf_name(sb, sbi, i);6447 6448 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);6449 if (!old_opts.s_qf_names[i]) {6450 for (j = 0; j < i; j++)6451 kfree(old_opts.s_qf_names[j]);6452 return -ENOMEM;6453 }6454 } else6455 old_opts.s_qf_names[i] = NULL;6456#endif6457 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) {6458 if (sbi->s_journal && sbi->s_journal->j_task->io_context)6459 ctx->journal_ioprio =6460 sbi->s_journal->j_task->io_context->ioprio;6461 else6462 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;6463 6464 }6465 6466 if ((ctx->spec & EXT4_SPEC_s_stripe) &&6467 ext4_is_stripe_incompatible(sb, ctx->s_stripe)) {6468 ext4_msg(sb, KERN_WARNING,6469 "stripe (%lu) is not aligned with cluster size (%u), "6470 "stripe is disabled",6471 ctx->s_stripe, sbi->s_cluster_ratio);6472 ctx->s_stripe = 0;6473 }6474 6475 /*6476 * Changing the DIOREAD_NOLOCK or DELALLOC mount options may cause6477 * two calls to ext4_should_dioread_nolock() to return inconsistent6478 * values, triggering WARN_ON in ext4_add_complete_io(). we grab6479 * here s_writepages_rwsem to avoid race between writepages ops and6480 * remount.6481 */6482 alloc_ctx = ext4_writepages_down_write(sb);6483 ext4_apply_options(fc, sb);6484 ext4_writepages_up_write(sb, alloc_ctx);6485 6486 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^6487 test_opt(sb, JOURNAL_CHECKSUM)) {6488 ext4_msg(sb, KERN_ERR, "changing journal_checksum "6489 "during remount not supported; ignoring");6490 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;6491 }6492 6493 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {6494 if (test_opt2(sb, EXPLICIT_DELALLOC)) {6495 ext4_msg(sb, KERN_ERR, "can't mount with "6496 "both data=journal and delalloc");6497 err = -EINVAL;6498 goto restore_opts;6499 }6500 if (test_opt(sb, DIOREAD_NOLOCK)) {6501 ext4_msg(sb, KERN_ERR, "can't mount with "6502 "both data=journal and dioread_nolock");6503 err = -EINVAL;6504 goto restore_opts;6505 }6506 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {6507 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {6508 ext4_msg(sb, KERN_ERR, "can't mount with "6509 "journal_async_commit in data=ordered mode");6510 err = -EINVAL;6511 goto restore_opts;6512 }6513 }6514 6515 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {6516 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");6517 err = -EINVAL;6518 goto restore_opts;6519 }6520 6521 if (test_opt2(sb, ABORT))6522 ext4_abort(sb, ESHUTDOWN, "Abort forced by user");6523 6524 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |6525 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);6526 6527 es = sbi->s_es;6528 6529 if (sbi->s_journal) {6530 ext4_init_journal_params(sb, sbi->s_journal);6531 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);6532 }6533 6534 /* Flush outstanding errors before changing fs state */6535 flush_work(&sbi->s_sb_upd_work);6536 6537 if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) {6538 if (ext4_forced_shutdown(sb)) {6539 err = -EROFS;6540 goto restore_opts;6541 }6542 6543 if (fc->sb_flags & SB_RDONLY) {6544 err = sync_filesystem(sb);6545 if (err < 0)6546 goto restore_opts;6547 err = dquot_suspend(sb, -1);6548 if (err < 0)6549 goto restore_opts;6550 6551 /*6552 * First of all, the unconditional stuff we have to do6553 * to disable replay of the journal when we next remount6554 */6555 sb->s_flags |= SB_RDONLY;6556 6557 /*6558 * OK, test if we are remounting a valid rw partition6559 * readonly, and if so set the rdonly flag and then6560 * mark the partition as valid again.6561 */6562 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&6563 (sbi->s_mount_state & EXT4_VALID_FS))6564 es->s_state = cpu_to_le16(sbi->s_mount_state);6565 6566 if (sbi->s_journal) {6567 /*6568 * We let remount-ro finish even if marking fs6569 * as clean failed...6570 */6571 ext4_mark_recovery_complete(sb, es);6572 }6573 } else {6574 /* Make sure we can mount this feature set readwrite */6575 if (ext4_has_feature_readonly(sb) ||6576 !ext4_feature_set_ok(sb, 0)) {6577 err = -EROFS;6578 goto restore_opts;6579 }6580 /*6581 * Make sure the group descriptor checksums6582 * are sane. If they aren't, refuse to remount r/w.6583 */6584 for (g = 0; g < sbi->s_groups_count; g++) {6585 struct ext4_group_desc *gdp =6586 ext4_get_group_desc(sb, g, NULL);6587 6588 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {6589 ext4_msg(sb, KERN_ERR,6590 "ext4_remount: Checksum for group %u failed (%u!=%u)",6591 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),6592 le16_to_cpu(gdp->bg_checksum));6593 err = -EFSBADCRC;6594 goto restore_opts;6595 }6596 }6597 6598 /*6599 * If we have an unprocessed orphan list hanging6600 * around from a previously readonly bdev mount,6601 * require a full umount/remount for now.6602 */6603 if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {6604 ext4_msg(sb, KERN_WARNING, "Couldn't "6605 "remount RDWR because of unprocessed "6606 "orphan inode list. Please "6607 "umount/remount instead");6608 err = -EINVAL;6609 goto restore_opts;6610 }6611 6612 /*6613 * Mounting a RDONLY partition read-write, so reread6614 * and store the current valid flag. (It may have6615 * been changed by e2fsck since we originally mounted6616 * the partition.)6617 */6618 if (sbi->s_journal) {6619 err = ext4_clear_journal_err(sb, es);6620 if (err)6621 goto restore_opts;6622 }6623 sbi->s_mount_state = (le16_to_cpu(es->s_state) &6624 ~EXT4_FC_REPLAY);6625 6626 err = ext4_setup_super(sb, es, 0);6627 if (err)6628 goto restore_opts;6629 6630 sb->s_flags &= ~SB_RDONLY;6631 if (ext4_has_feature_mmp(sb)) {6632 err = ext4_multi_mount_protect(sb,6633 le64_to_cpu(es->s_mmp_block));6634 if (err)6635 goto restore_opts;6636 }6637#ifdef CONFIG_QUOTA6638 enable_quota = 1;6639#endif6640 }6641 }6642 6643 /*6644 * Handle creation of system zone data early because it can fail.6645 * Releasing of existing data is done when we are sure remount will6646 * succeed.6647 */6648 if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {6649 err = ext4_setup_system_zone(sb);6650 if (err)6651 goto restore_opts;6652 }6653 6654 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {6655 err = ext4_commit_super(sb);6656 if (err)6657 goto restore_opts;6658 }6659 6660#ifdef CONFIG_QUOTA6661 if (enable_quota) {6662 if (sb_any_quota_suspended(sb))6663 dquot_resume(sb, -1);6664 else if (ext4_has_feature_quota(sb)) {6665 err = ext4_enable_quotas(sb);6666 if (err)6667 goto restore_opts;6668 }6669 }6670 /* Release old quota file names */6671 for (i = 0; i < EXT4_MAXQUOTAS; i++)6672 kfree(old_opts.s_qf_names[i]);6673#endif6674 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)6675 ext4_release_system_zone(sb);6676 6677 /*6678 * Reinitialize lazy itable initialization thread based on6679 * current settings6680 */6681 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))6682 ext4_unregister_li_request(sb);6683 else {6684 ext4_group_t first_not_zeroed;6685 first_not_zeroed = ext4_has_uninit_itable(sb);6686 ext4_register_li_request(sb, first_not_zeroed);6687 }6688 6689 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))6690 ext4_stop_mmpd(sbi);6691 6692 return 0;6693 6694restore_opts:6695 /*6696 * If there was a failing r/w to ro transition, we may need to6697 * re-enable quota6698 */6699 if (sb_rdonly(sb) && !(old_sb_flags & SB_RDONLY) &&6700 sb_any_quota_suspended(sb))6701 dquot_resume(sb, -1);6702 6703 alloc_ctx = ext4_writepages_down_write(sb);6704 sb->s_flags = old_sb_flags;6705 sbi->s_mount_opt = old_opts.s_mount_opt;6706 sbi->s_mount_opt2 = old_opts.s_mount_opt2;6707 sbi->s_resuid = old_opts.s_resuid;6708 sbi->s_resgid = old_opts.s_resgid;6709 sbi->s_commit_interval = old_opts.s_commit_interval;6710 sbi->s_min_batch_time = old_opts.s_min_batch_time;6711 sbi->s_max_batch_time = old_opts.s_max_batch_time;6712 ext4_writepages_up_write(sb, alloc_ctx);6713 6714 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)6715 ext4_release_system_zone(sb);6716#ifdef CONFIG_QUOTA6717 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;6718 for (i = 0; i < EXT4_MAXQUOTAS; i++) {6719 to_free[i] = get_qf_name(sb, sbi, i);6720 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);6721 }6722 synchronize_rcu();6723 for (i = 0; i < EXT4_MAXQUOTAS; i++)6724 kfree(to_free[i]);6725#endif6726 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))6727 ext4_stop_mmpd(sbi);6728 return err;6729}6730 6731static int ext4_reconfigure(struct fs_context *fc)6732{6733 struct super_block *sb = fc->root->d_sb;6734 int ret;6735 6736 fc->s_fs_info = EXT4_SB(sb);6737 6738 ret = ext4_check_opt_consistency(fc, sb);6739 if (ret < 0)6740 return ret;6741 6742 ret = __ext4_remount(fc, sb);6743 if (ret < 0)6744 return ret;6745 6746 ext4_msg(sb, KERN_INFO, "re-mounted %pU %s. Quota mode: %s.",6747 &sb->s_uuid, sb_rdonly(sb) ? "ro" : "r/w",6748 ext4_quota_mode(sb));6749 6750 return 0;6751}6752 6753#ifdef CONFIG_QUOTA6754static int ext4_statfs_project(struct super_block *sb,6755 kprojid_t projid, struct kstatfs *buf)6756{6757 struct kqid qid;6758 struct dquot *dquot;6759 u64 limit;6760 u64 curblock;6761 6762 qid = make_kqid_projid(projid);6763 dquot = dqget(sb, qid);6764 if (IS_ERR(dquot))6765 return PTR_ERR(dquot);6766 spin_lock(&dquot->dq_dqb_lock);6767 6768 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,6769 dquot->dq_dqb.dqb_bhardlimit);6770 limit >>= sb->s_blocksize_bits;6771 6772 if (limit && buf->f_blocks > limit) {6773 curblock = (dquot->dq_dqb.dqb_curspace +6774 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;6775 buf->f_blocks = limit;6776 buf->f_bfree = buf->f_bavail =6777 (buf->f_blocks > curblock) ?6778 (buf->f_blocks - curblock) : 0;6779 }6780 6781 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,6782 dquot->dq_dqb.dqb_ihardlimit);6783 if (limit && buf->f_files > limit) {6784 buf->f_files = limit;6785 buf->f_ffree =6786 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?6787 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;6788 }6789 6790 spin_unlock(&dquot->dq_dqb_lock);6791 dqput(dquot);6792 return 0;6793}6794#endif6795 6796static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)6797{6798 struct super_block *sb = dentry->d_sb;6799 struct ext4_sb_info *sbi = EXT4_SB(sb);6800 struct ext4_super_block *es = sbi->s_es;6801 ext4_fsblk_t overhead = 0, resv_blocks;6802 s64 bfree;6803 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));6804 6805 if (!test_opt(sb, MINIX_DF))6806 overhead = sbi->s_overhead;6807 6808 buf->f_type = EXT4_SUPER_MAGIC;6809 buf->f_bsize = sb->s_blocksize;6810 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);6811 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -6812 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);6813 /* prevent underflow in case that few free space is available */6814 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));6815 buf->f_bavail = buf->f_bfree -6816 (ext4_r_blocks_count(es) + resv_blocks);6817 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))6818 buf->f_bavail = 0;6819 buf->f_files = le32_to_cpu(es->s_inodes_count);6820 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);6821 buf->f_namelen = EXT4_NAME_LEN;6822 buf->f_fsid = uuid_to_fsid(es->s_uuid);6823 6824#ifdef CONFIG_QUOTA6825 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&6826 sb_has_quota_limits_enabled(sb, PRJQUOTA))6827 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);6828#endif6829 return 0;6830}6831 6832 6833#ifdef CONFIG_QUOTA6834 6835/*6836 * Helper functions so that transaction is started before we acquire dqio_sem6837 * to keep correct lock ordering of transaction > dqio_sem6838 */6839static inline struct inode *dquot_to_inode(struct dquot *dquot)6840{6841 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];6842}6843 6844static int ext4_write_dquot(struct dquot *dquot)6845{6846 int ret, err;6847 handle_t *handle;6848 struct inode *inode;6849 6850 inode = dquot_to_inode(dquot);6851 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,6852 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));6853 if (IS_ERR(handle))6854 return PTR_ERR(handle);6855 ret = dquot_commit(dquot);6856 if (ret < 0)6857 ext4_error_err(dquot->dq_sb, -ret,6858 "Failed to commit dquot type %d",6859 dquot->dq_id.type);6860 err = ext4_journal_stop(handle);6861 if (!ret)6862 ret = err;6863 return ret;6864}6865 6866static int ext4_acquire_dquot(struct dquot *dquot)6867{6868 int ret, err;6869 handle_t *handle;6870 6871 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,6872 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));6873 if (IS_ERR(handle))6874 return PTR_ERR(handle);6875 ret = dquot_acquire(dquot);6876 if (ret < 0)6877 ext4_error_err(dquot->dq_sb, -ret,6878 "Failed to acquire dquot type %d",6879 dquot->dq_id.type);6880 err = ext4_journal_stop(handle);6881 if (!ret)6882 ret = err;6883 return ret;6884}6885 6886static int ext4_release_dquot(struct dquot *dquot)6887{6888 int ret, err;6889 handle_t *handle;6890 6891 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,6892 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));6893 if (IS_ERR(handle)) {6894 /* Release dquot anyway to avoid endless cycle in dqput() */6895 dquot_release(dquot);6896 return PTR_ERR(handle);6897 }6898 ret = dquot_release(dquot);6899 if (ret < 0)6900 ext4_error_err(dquot->dq_sb, -ret,6901 "Failed to release dquot type %d",6902 dquot->dq_id.type);6903 err = ext4_journal_stop(handle);6904 if (!ret)6905 ret = err;6906 return ret;6907}6908 6909static int ext4_mark_dquot_dirty(struct dquot *dquot)6910{6911 struct super_block *sb = dquot->dq_sb;6912 6913 if (ext4_is_quota_journalled(sb)) {6914 dquot_mark_dquot_dirty(dquot);6915 return ext4_write_dquot(dquot);6916 } else {6917 return dquot_mark_dquot_dirty(dquot);6918 }6919}6920 6921static int ext4_write_info(struct super_block *sb, int type)6922{6923 int ret, err;6924 handle_t *handle;6925 6926 /* Data block + inode block */6927 handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2);6928 if (IS_ERR(handle))6929 return PTR_ERR(handle);6930 ret = dquot_commit_info(sb, type);6931 err = ext4_journal_stop(handle);6932 if (!ret)6933 ret = err;6934 return ret;6935}6936 6937static void lockdep_set_quota_inode(struct inode *inode, int subclass)6938{6939 struct ext4_inode_info *ei = EXT4_I(inode);6940 6941 /* The first argument of lockdep_set_subclass has to be6942 * *exactly* the same as the argument to init_rwsem() --- in6943 * this case, in init_once() --- or lockdep gets unhappy6944 * because the name of the lock is set using the6945 * stringification of the argument to init_rwsem().6946 */6947 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */6948 lockdep_set_subclass(&ei->i_data_sem, subclass);6949}6950 6951/*6952 * Standard function to be called on quota_on6953 */6954static int ext4_quota_on(struct super_block *sb, int type, int format_id,6955 const struct path *path)6956{6957 int err;6958 6959 if (!test_opt(sb, QUOTA))6960 return -EINVAL;6961 6962 /* Quotafile not on the same filesystem? */6963 if (path->dentry->d_sb != sb)6964 return -EXDEV;6965 6966 /* Quota already enabled for this file? */6967 if (IS_NOQUOTA(d_inode(path->dentry)))6968 return -EBUSY;6969 6970 /* Journaling quota? */6971 if (EXT4_SB(sb)->s_qf_names[type]) {6972 /* Quotafile not in fs root? */6973 if (path->dentry->d_parent != sb->s_root)6974 ext4_msg(sb, KERN_WARNING,6975 "Quota file not on filesystem root. "6976 "Journaled quota will not work");6977 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;6978 } else {6979 /*6980 * Clear the flag just in case mount options changed since6981 * last time.6982 */6983 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;6984 }6985 6986 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);6987 err = dquot_quota_on(sb, type, format_id, path);6988 if (!err) {6989 struct inode *inode = d_inode(path->dentry);6990 handle_t *handle;6991 6992 /*6993 * Set inode flags to prevent userspace from messing with quota6994 * files. If this fails, we return success anyway since quotas6995 * are already enabled and this is not a hard failure.6996 */6997 inode_lock(inode);6998 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);6999 if (IS_ERR(handle))7000 goto unlock_inode;7001 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;7002 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,7003 S_NOATIME | S_IMMUTABLE);7004 err = ext4_mark_inode_dirty(handle, inode);7005 ext4_journal_stop(handle);7006 unlock_inode:7007 inode_unlock(inode);7008 if (err)7009 dquot_quota_off(sb, type);7010 }7011 if (err)7012 lockdep_set_quota_inode(path->dentry->d_inode,7013 I_DATA_SEM_NORMAL);7014 return err;7015}7016 7017static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum)7018{7019 switch (type) {7020 case USRQUOTA:7021 return qf_inum == EXT4_USR_QUOTA_INO;7022 case GRPQUOTA:7023 return qf_inum == EXT4_GRP_QUOTA_INO;7024 case PRJQUOTA:7025 return qf_inum >= EXT4_GOOD_OLD_FIRST_INO;7026 default:7027 BUG();7028 }7029}7030 7031static int ext4_quota_enable(struct super_block *sb, int type, int format_id,7032 unsigned int flags)7033{7034 int err;7035 struct inode *qf_inode;7036 unsigned long qf_inums[EXT4_MAXQUOTAS] = {7037 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),7038 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),7039 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)7040 };7041 7042 BUG_ON(!ext4_has_feature_quota(sb));7043 7044 if (!qf_inums[type])7045 return -EPERM;7046 7047 if (!ext4_check_quota_inum(type, qf_inums[type])) {7048 ext4_error(sb, "Bad quota inum: %lu, type: %d",7049 qf_inums[type], type);7050 return -EUCLEAN;7051 }7052 7053 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);7054 if (IS_ERR(qf_inode)) {7055 ext4_error(sb, "Bad quota inode: %lu, type: %d",7056 qf_inums[type], type);7057 return PTR_ERR(qf_inode);7058 }7059 7060 /* Don't account quota for quota files to avoid recursion */7061 qf_inode->i_flags |= S_NOQUOTA;7062 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);7063 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);7064 if (err)7065 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);7066 iput(qf_inode);7067 7068 return err;7069}7070 7071/* Enable usage tracking for all quota types. */7072int ext4_enable_quotas(struct super_block *sb)7073{7074 int type, err = 0;7075 unsigned long qf_inums[EXT4_MAXQUOTAS] = {7076 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),7077 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),7078 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)7079 };7080 bool quota_mopt[EXT4_MAXQUOTAS] = {7081 test_opt(sb, USRQUOTA),7082 test_opt(sb, GRPQUOTA),7083 test_opt(sb, PRJQUOTA),7084 };7085 7086 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;7087 for (type = 0; type < EXT4_MAXQUOTAS; type++) {7088 if (qf_inums[type]) {7089 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,7090 DQUOT_USAGE_ENABLED |7091 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));7092 if (err) {7093 ext4_warning(sb,7094 "Failed to enable quota tracking "7095 "(type=%d, err=%d, ino=%lu). "7096 "Please run e2fsck to fix.", type,7097 err, qf_inums[type]);7098 7099 ext4_quotas_off(sb, type);7100 return err;7101 }7102 }7103 }7104 return 0;7105}7106 7107static int ext4_quota_off(struct super_block *sb, int type)7108{7109 struct inode *inode = sb_dqopt(sb)->files[type];7110 handle_t *handle;7111 int err;7112 7113 /* Force all delayed allocation blocks to be allocated.7114 * Caller already holds s_umount sem */7115 if (test_opt(sb, DELALLOC))7116 sync_filesystem(sb);7117 7118 if (!inode || !igrab(inode))7119 goto out;7120 7121 err = dquot_quota_off(sb, type);7122 if (err || ext4_has_feature_quota(sb))7123 goto out_put;7124 /*7125 * When the filesystem was remounted read-only first, we cannot cleanup7126 * inode flags here. Bad luck but people should be using QUOTA feature7127 * these days anyway.7128 */7129 if (sb_rdonly(sb))7130 goto out_put;7131 7132 inode_lock(inode);7133 /*7134 * Update modification times of quota files when userspace can7135 * start looking at them. If we fail, we return success anyway since7136 * this is not a hard failure and quotas are already disabled.7137 */7138 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);7139 if (IS_ERR(handle)) {7140 err = PTR_ERR(handle);7141 goto out_unlock;7142 }7143 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);7144 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);7145 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));7146 err = ext4_mark_inode_dirty(handle, inode);7147 ext4_journal_stop(handle);7148out_unlock:7149 inode_unlock(inode);7150out_put:7151 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);7152 iput(inode);7153 return err;7154out:7155 return dquot_quota_off(sb, type);7156}7157 7158/* Read data from quotafile - avoid pagecache and such because we cannot afford7159 * acquiring the locks... As quota files are never truncated and quota code7160 * itself serializes the operations (and no one else should touch the files)7161 * we don't have to be afraid of races */7162static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,7163 size_t len, loff_t off)7164{7165 struct inode *inode = sb_dqopt(sb)->files[type];7166 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);7167 int offset = off & (sb->s_blocksize - 1);7168 int tocopy;7169 size_t toread;7170 struct buffer_head *bh;7171 loff_t i_size = i_size_read(inode);7172 7173 if (off > i_size)7174 return 0;7175 if (off+len > i_size)7176 len = i_size-off;7177 toread = len;7178 while (toread > 0) {7179 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);7180 bh = ext4_bread(NULL, inode, blk, 0);7181 if (IS_ERR(bh))7182 return PTR_ERR(bh);7183 if (!bh) /* A hole? */7184 memset(data, 0, tocopy);7185 else7186 memcpy(data, bh->b_data+offset, tocopy);7187 brelse(bh);7188 offset = 0;7189 toread -= tocopy;7190 data += tocopy;7191 blk++;7192 }7193 return len;7194}7195 7196/* Write to quotafile (we know the transaction is already started and has7197 * enough credits) */7198static ssize_t ext4_quota_write(struct super_block *sb, int type,7199 const char *data, size_t len, loff_t off)7200{7201 struct inode *inode = sb_dqopt(sb)->files[type];7202 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);7203 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);7204 int retries = 0;7205 struct buffer_head *bh;7206 handle_t *handle = journal_current_handle();7207 7208 if (!handle) {7209 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"7210 " cancelled because transaction is not started",7211 (unsigned long long)off, (unsigned long long)len);7212 return -EIO;7213 }7214 /*7215 * Since we account only one data block in transaction credits,7216 * then it is impossible to cross a block boundary.7217 */7218 if (sb->s_blocksize - offset < len) {7219 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"7220 " cancelled because not block aligned",7221 (unsigned long long)off, (unsigned long long)len);7222 return -EIO;7223 }7224 7225 do {7226 bh = ext4_bread(handle, inode, blk,7227 EXT4_GET_BLOCKS_CREATE |7228 EXT4_GET_BLOCKS_METADATA_NOFAIL);7229 } while (PTR_ERR(bh) == -ENOSPC &&7230 ext4_should_retry_alloc(inode->i_sb, &retries));7231 if (IS_ERR(bh))7232 return PTR_ERR(bh);7233 if (!bh)7234 goto out;7235 BUFFER_TRACE(bh, "get write access");7236 err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);7237 if (err) {7238 brelse(bh);7239 return err;7240 }7241 lock_buffer(bh);7242 memcpy(bh->b_data+offset, data, len);7243 flush_dcache_page(bh->b_page);7244 unlock_buffer(bh);7245 err = ext4_handle_dirty_metadata(handle, NULL, bh);7246 brelse(bh);7247out:7248 if (inode->i_size < off + len) {7249 i_size_write(inode, off + len);7250 EXT4_I(inode)->i_disksize = inode->i_size;7251 err2 = ext4_mark_inode_dirty(handle, inode);7252 if (unlikely(err2 && !err))7253 err = err2;7254 }7255 return err ? err : len;7256}7257#endif7258 7259#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)7260static inline void register_as_ext2(void)7261{7262 int err = register_filesystem(&ext2_fs_type);7263 if (err)7264 printk(KERN_WARNING7265 "EXT4-fs: Unable to register as ext2 (%d)\n", err);7266}7267 7268static inline void unregister_as_ext2(void)7269{7270 unregister_filesystem(&ext2_fs_type);7271}7272 7273static inline int ext2_feature_set_ok(struct super_block *sb)7274{7275 if (ext4_has_unknown_ext2_incompat_features(sb))7276 return 0;7277 if (sb_rdonly(sb))7278 return 1;7279 if (ext4_has_unknown_ext2_ro_compat_features(sb))7280 return 0;7281 return 1;7282}7283#else7284static inline void register_as_ext2(void) { }7285static inline void unregister_as_ext2(void) { }7286static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }7287#endif7288 7289static inline void register_as_ext3(void)7290{7291 int err = register_filesystem(&ext3_fs_type);7292 if (err)7293 printk(KERN_WARNING7294 "EXT4-fs: Unable to register as ext3 (%d)\n", err);7295}7296 7297static inline void unregister_as_ext3(void)7298{7299 unregister_filesystem(&ext3_fs_type);7300}7301 7302static inline int ext3_feature_set_ok(struct super_block *sb)7303{7304 if (ext4_has_unknown_ext3_incompat_features(sb))7305 return 0;7306 if (!ext4_has_feature_journal(sb))7307 return 0;7308 if (sb_rdonly(sb))7309 return 1;7310 if (ext4_has_unknown_ext3_ro_compat_features(sb))7311 return 0;7312 return 1;7313}7314 7315static void ext4_kill_sb(struct super_block *sb)7316{7317 struct ext4_sb_info *sbi = EXT4_SB(sb);7318 struct file *bdev_file = sbi ? sbi->s_journal_bdev_file : NULL;7319 7320 kill_block_super(sb);7321 7322 if (bdev_file)7323 bdev_fput(bdev_file);7324}7325 7326static struct file_system_type ext4_fs_type = {7327 .owner = THIS_MODULE,7328 .name = "ext4",7329 .init_fs_context = ext4_init_fs_context,7330 .parameters = ext4_param_specs,7331 .kill_sb = ext4_kill_sb,7332 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,7333};7334MODULE_ALIAS_FS("ext4");7335 7336/* Shared across all ext4 file systems */7337wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];7338 7339static int __init ext4_init_fs(void)7340{7341 int i, err;7342 7343 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);7344 ext4_li_info = NULL;7345 7346 /* Build-time check for flags consistency */7347 ext4_check_flag_values();7348 7349 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)7350 init_waitqueue_head(&ext4__ioend_wq[i]);7351 7352 err = ext4_init_es();7353 if (err)7354 return err;7355 7356 err = ext4_init_pending();7357 if (err)7358 goto out7;7359 7360 err = ext4_init_post_read_processing();7361 if (err)7362 goto out6;7363 7364 err = ext4_init_pageio();7365 if (err)7366 goto out5;7367 7368 err = ext4_init_system_zone();7369 if (err)7370 goto out4;7371 7372 err = ext4_init_sysfs();7373 if (err)7374 goto out3;7375 7376 err = ext4_init_mballoc();7377 if (err)7378 goto out2;7379 err = init_inodecache();7380 if (err)7381 goto out1;7382 7383 err = ext4_fc_init_dentry_cache();7384 if (err)7385 goto out05;7386 7387 register_as_ext3();7388 register_as_ext2();7389 err = register_filesystem(&ext4_fs_type);7390 if (err)7391 goto out;7392 7393 return 0;7394out:7395 unregister_as_ext2();7396 unregister_as_ext3();7397 ext4_fc_destroy_dentry_cache();7398out05:7399 destroy_inodecache();7400out1:7401 ext4_exit_mballoc();7402out2:7403 ext4_exit_sysfs();7404out3:7405 ext4_exit_system_zone();7406out4:7407 ext4_exit_pageio();7408out5:7409 ext4_exit_post_read_processing();7410out6:7411 ext4_exit_pending();7412out7:7413 ext4_exit_es();7414 7415 return err;7416}7417 7418static void __exit ext4_exit_fs(void)7419{7420 ext4_destroy_lazyinit_thread();7421 unregister_as_ext2();7422 unregister_as_ext3();7423 unregister_filesystem(&ext4_fs_type);7424 ext4_fc_destroy_dentry_cache();7425 destroy_inodecache();7426 ext4_exit_mballoc();7427 ext4_exit_sysfs();7428 ext4_exit_system_zone();7429 ext4_exit_pageio();7430 ext4_exit_post_read_processing();7431 ext4_exit_es();7432 ext4_exit_pending();7433}7434 7435MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");7436MODULE_DESCRIPTION("Fourth Extended Filesystem");7437MODULE_LICENSE("GPL");7438MODULE_SOFTDEP("pre: crc32c");7439module_init(ext4_init_fs)7440module_exit(ext4_exit_fs)7441