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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2017-2018 HUAWEI, Inc.4 * https://www.huawei.com/5 * Copyright (C) 2021, Alibaba Cloud6 */7#include "xattr.h"8#include <trace/events/erofs.h>9 10static int erofs_fill_symlink(struct inode *inode, void *kaddr,11 unsigned int m_pofs)12{13 struct erofs_inode *vi = EROFS_I(inode);14 loff_t off;15 16 m_pofs += vi->xattr_isize;17 /* check if it cannot be handled with fast symlink scheme */18 if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||19 check_add_overflow(m_pofs, inode->i_size, &off) ||20 off > i_blocksize(inode))21 return 0;22 23 inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL);24 return inode->i_link ? 0 : -ENOMEM;25}26 27static int erofs_read_inode(struct inode *inode)28{29 struct super_block *sb = inode->i_sb;30 struct erofs_sb_info *sbi = EROFS_SB(sb);31 struct erofs_inode *vi = EROFS_I(inode);32 const erofs_off_t inode_loc = erofs_iloc(inode);33 erofs_blk_t blkaddr, nblks = 0;34 void *kaddr;35 struct erofs_inode_compact *dic;36 struct erofs_inode_extended *die, *copied = NULL;37 union erofs_inode_i_u iu;38 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;39 unsigned int ifmt, ofs;40 int err = 0;41 42 blkaddr = erofs_blknr(sb, inode_loc);43 ofs = erofs_blkoff(sb, inode_loc);44 45 kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), EROFS_KMAP);46 if (IS_ERR(kaddr)) {47 erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",48 vi->nid, PTR_ERR(kaddr));49 return PTR_ERR(kaddr);50 }51 52 dic = kaddr + ofs;53 ifmt = le16_to_cpu(dic->i_format);54 if (ifmt & ~EROFS_I_ALL) {55 erofs_err(sb, "unsupported i_format %u of nid %llu",56 ifmt, vi->nid);57 err = -EOPNOTSUPP;58 goto err_out;59 }60 61 vi->datalayout = erofs_inode_datalayout(ifmt);62 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {63 erofs_err(sb, "unsupported datalayout %u of nid %llu",64 vi->datalayout, vi->nid);65 err = -EOPNOTSUPP;66 goto err_out;67 }68 69 switch (erofs_inode_version(ifmt)) {70 case EROFS_INODE_LAYOUT_EXTENDED:71 vi->inode_isize = sizeof(struct erofs_inode_extended);72 /* check if the extended inode acrosses block boundary */73 if (ofs + vi->inode_isize <= sb->s_blocksize) {74 ofs += vi->inode_isize;75 die = (struct erofs_inode_extended *)dic;76 } else {77 const unsigned int gotten = sb->s_blocksize - ofs;78 79 copied = kmalloc(vi->inode_isize, GFP_KERNEL);80 if (!copied) {81 err = -ENOMEM;82 goto err_out;83 }84 memcpy(copied, dic, gotten);85 kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr + 1),86 EROFS_KMAP);87 if (IS_ERR(kaddr)) {88 erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",89 vi->nid, PTR_ERR(kaddr));90 kfree(copied);91 return PTR_ERR(kaddr);92 }93 ofs = vi->inode_isize - gotten;94 memcpy((u8 *)copied + gotten, kaddr, ofs);95 die = copied;96 }97 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);98 99 inode->i_mode = le16_to_cpu(die->i_mode);100 iu = die->i_u;101 i_uid_write(inode, le32_to_cpu(die->i_uid));102 i_gid_write(inode, le32_to_cpu(die->i_gid));103 set_nlink(inode, le32_to_cpu(die->i_nlink));104 /* each extended inode has its own timestamp */105 inode_set_ctime(inode, le64_to_cpu(die->i_mtime),106 le32_to_cpu(die->i_mtime_nsec));107 108 inode->i_size = le64_to_cpu(die->i_size);109 kfree(copied);110 break;111 case EROFS_INODE_LAYOUT_COMPACT:112 vi->inode_isize = sizeof(struct erofs_inode_compact);113 ofs += vi->inode_isize;114 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);115 116 inode->i_mode = le16_to_cpu(dic->i_mode);117 iu = dic->i_u;118 i_uid_write(inode, le16_to_cpu(dic->i_uid));119 i_gid_write(inode, le16_to_cpu(dic->i_gid));120 set_nlink(inode, le16_to_cpu(dic->i_nlink));121 /* use build time for compact inodes */122 inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec);123 124 inode->i_size = le32_to_cpu(dic->i_size);125 break;126 default:127 erofs_err(sb, "unsupported on-disk inode version %u of nid %llu",128 erofs_inode_version(ifmt), vi->nid);129 err = -EOPNOTSUPP;130 goto err_out;131 }132 133 if (unlikely(inode->i_size < 0)) {134 erofs_err(sb, "negative i_size @ nid %llu", vi->nid);135 err = -EFSCORRUPTED;136 goto err_out;137 }138 switch (inode->i_mode & S_IFMT) {139 case S_IFREG:140 case S_IFDIR:141 case S_IFLNK:142 vi->raw_blkaddr = le32_to_cpu(iu.raw_blkaddr);143 if(S_ISLNK(inode->i_mode)) {144 err = erofs_fill_symlink(inode, kaddr, ofs);145 if (err)146 goto err_out;147 }148 break;149 case S_IFCHR:150 case S_IFBLK:151 inode->i_rdev = new_decode_dev(le32_to_cpu(iu.rdev));152 break;153 case S_IFIFO:154 case S_IFSOCK:155 inode->i_rdev = 0;156 break;157 default:158 erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode,159 vi->nid);160 err = -EFSCORRUPTED;161 goto err_out;162 }163 164 /* total blocks for compressed files */165 if (erofs_inode_is_data_compressed(vi->datalayout)) {166 nblks = le32_to_cpu(iu.compressed_blocks);167 } else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {168 /* fill chunked inode summary info */169 vi->chunkformat = le16_to_cpu(iu.c.format);170 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {171 erofs_err(sb, "unsupported chunk format %x of nid %llu",172 vi->chunkformat, vi->nid);173 err = -EOPNOTSUPP;174 goto err_out;175 }176 vi->chunkbits = sb->s_blocksize_bits +177 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);178 }179 inode_set_mtime_to_ts(inode,180 inode_set_atime_to_ts(inode, inode_get_ctime(inode)));181 182 inode->i_flags &= ~S_DAX;183 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&184 (vi->datalayout == EROFS_INODE_FLAT_PLAIN ||185 vi->datalayout == EROFS_INODE_CHUNK_BASED))186 inode->i_flags |= S_DAX;187 188 if (!nblks)189 /* measure inode.i_blocks as generic filesystems */190 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9;191 else192 inode->i_blocks = nblks << (sb->s_blocksize_bits - 9);193err_out:194 DBG_BUGON(err);195 erofs_put_metabuf(&buf);196 return err;197}198 199static int erofs_fill_inode(struct inode *inode)200{201 struct erofs_inode *vi = EROFS_I(inode);202 int err;203 204 trace_erofs_fill_inode(inode);205 206 /* read inode base data from disk */207 err = erofs_read_inode(inode);208 if (err)209 return err;210 211 /* setup the new inode */212 switch (inode->i_mode & S_IFMT) {213 case S_IFREG:214 inode->i_op = &erofs_generic_iops;215 if (erofs_inode_is_data_compressed(vi->datalayout))216 inode->i_fop = &generic_ro_fops;217 else218 inode->i_fop = &erofs_file_fops;219 break;220 case S_IFDIR:221 inode->i_op = &erofs_dir_iops;222 inode->i_fop = &erofs_dir_fops;223 inode_nohighmem(inode);224 break;225 case S_IFLNK:226 if (inode->i_link)227 inode->i_op = &erofs_fast_symlink_iops;228 else229 inode->i_op = &erofs_symlink_iops;230 inode_nohighmem(inode);231 break;232 case S_IFCHR:233 case S_IFBLK:234 case S_IFIFO:235 case S_IFSOCK:236 inode->i_op = &erofs_generic_iops;237 init_special_inode(inode, inode->i_mode, inode->i_rdev);238 return 0;239 default:240 return -EFSCORRUPTED;241 }242 243 mapping_set_large_folios(inode->i_mapping);244 if (erofs_inode_is_data_compressed(vi->datalayout)) {245#ifdef CONFIG_EROFS_FS_ZIP246 DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT,247 erofs_info, inode->i_sb,248 "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");249 inode->i_mapping->a_ops = &z_erofs_aops;250#else251 err = -EOPNOTSUPP;252#endif253 } else {254 inode->i_mapping->a_ops = &erofs_aops;255#ifdef CONFIG_EROFS_FS_ONDEMAND256 if (erofs_is_fscache_mode(inode->i_sb))257 inode->i_mapping->a_ops = &erofs_fscache_access_aops;258#endif259#ifdef CONFIG_EROFS_FS_BACKED_BY_FILE260 if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb)))261 inode->i_mapping->a_ops = &erofs_fileio_aops;262#endif263 }264 265 return err;266}267 268/*269 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down270 * so that it will fit.271 */272static ino_t erofs_squash_ino(erofs_nid_t nid)273{274 ino_t ino = (ino_t)nid;275 276 if (sizeof(ino_t) < sizeof(erofs_nid_t))277 ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8;278 return ino;279}280 281static int erofs_iget5_eq(struct inode *inode, void *opaque)282{283 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque;284}285 286static int erofs_iget5_set(struct inode *inode, void *opaque)287{288 const erofs_nid_t nid = *(erofs_nid_t *)opaque;289 290 inode->i_ino = erofs_squash_ino(nid);291 EROFS_I(inode)->nid = nid;292 return 0;293}294 295struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid)296{297 struct inode *inode;298 299 inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq,300 erofs_iget5_set, &nid);301 if (!inode)302 return ERR_PTR(-ENOMEM);303 304 if (inode->i_state & I_NEW) {305 int err = erofs_fill_inode(inode);306 307 if (err) {308 iget_failed(inode);309 return ERR_PTR(err);310 }311 unlock_new_inode(inode);312 }313 return inode;314}315 316int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,317 struct kstat *stat, u32 request_mask,318 unsigned int query_flags)319{320 struct inode *const inode = d_inode(path->dentry);321 bool compressed =322 erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout);323 324 if (compressed)325 stat->attributes |= STATX_ATTR_COMPRESSED;326 stat->attributes |= STATX_ATTR_IMMUTABLE;327 stat->attributes_mask |= (STATX_ATTR_COMPRESSED |328 STATX_ATTR_IMMUTABLE);329 330 /*331 * Return the DIO alignment restrictions if requested.332 *333 * In EROFS, STATX_DIOALIGN is not supported in ondemand mode and334 * compressed files, so in these cases we report no DIO support.335 */336 if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {337 stat->result_mask |= STATX_DIOALIGN;338 if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) {339 stat->dio_mem_align =340 bdev_logical_block_size(inode->i_sb->s_bdev);341 stat->dio_offset_align = stat->dio_mem_align;342 }343 }344 generic_fillattr(idmap, request_mask, inode, stat);345 return 0;346}347 348const struct inode_operations erofs_generic_iops = {349 .getattr = erofs_getattr,350 .listxattr = erofs_listxattr,351 .get_inode_acl = erofs_get_acl,352 .fiemap = erofs_fiemap,353};354 355const struct inode_operations erofs_symlink_iops = {356 .get_link = page_get_link,357 .getattr = erofs_getattr,358 .listxattr = erofs_listxattr,359 .get_inode_acl = erofs_get_acl,360};361 362const struct inode_operations erofs_fast_symlink_iops = {363 .get_link = simple_get_link,364 .getattr = erofs_getattr,365 .listxattr = erofs_listxattr,366 .get_inode_acl = erofs_get_acl,367};368