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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/ufs/ialloc.c4 *5 * Copyright (c) 19986 * Daniel Pirkl <daniel.pirkl@email.cz>7 * Charles University, Faculty of Mathematics and Physics8 *9 * from10 *11 * linux/fs/ext2/ialloc.c12 *13 * Copyright (C) 1992, 1993, 1994, 199514 * Remy Card (card@masi.ibp.fr)15 * Laboratoire MASI - Institut Blaise Pascal16 * Universite Pierre et Marie Curie (Paris VI)17 *18 * BSD ufs-inspired inode and directory allocation by 19 * Stephen Tweedie (sct@dcs.ed.ac.uk), 199320 * Big-endian to little-endian byte-swapping/bitmaps by21 * David S. Miller (davem@caip.rutgers.edu), 199522 *23 * UFS2 write support added by24 * Evgeniy Dushistov <dushistov@mail.ru>, 200725 */26 27#include <linux/fs.h>28#include <linux/time.h>29#include <linux/stat.h>30#include <linux/string.h>31#include <linux/buffer_head.h>32#include <linux/sched.h>33#include <linux/bitops.h>34#include <asm/byteorder.h>35 36#include "ufs_fs.h"37#include "ufs.h"38#include "swab.h"39#include "util.h"40 41/*42 * NOTE! When we get the inode, we're the only people43 * that have access to it, and as such there are no44 * race conditions we have to worry about. The inode45 * is not on the hash-lists, and it cannot be reached46 * through the filesystem because the directory entry47 * has been deleted earlier.48 *49 * HOWEVER: we must make sure that we get no aliases,50 * which means that we have to call "clear_inode()"51 * _before_ we mark the inode not in use in the inode52 * bitmaps. Otherwise a newly created file might use53 * the same inode number (not actually the same pointer54 * though), and then we'd have two inodes sharing the55 * same inode number and space on the harddisk.56 */57void ufs_free_inode (struct inode * inode)58{59 struct super_block * sb;60 struct ufs_sb_private_info * uspi;61 struct ufs_cg_private_info * ucpi;62 struct ufs_cylinder_group * ucg;63 int is_directory;64 unsigned ino, cg, bit;65 66 UFSD("ENTER, ino %lu\n", inode->i_ino);67 68 sb = inode->i_sb;69 uspi = UFS_SB(sb)->s_uspi;70 71 ino = inode->i_ino;72 73 mutex_lock(&UFS_SB(sb)->s_lock);74 75 if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) {76 ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino);77 mutex_unlock(&UFS_SB(sb)->s_lock);78 return;79 }80 81 cg = ufs_inotocg (ino);82 bit = ufs_inotocgoff (ino);83 ucpi = ufs_load_cylinder (sb, cg);84 if (!ucpi) {85 mutex_unlock(&UFS_SB(sb)->s_lock);86 return;87 }88 ucg = ubh_get_ucg(UCPI_UBH(ucpi));89 if (!ufs_cg_chkmagic(sb, ucg))90 ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number");91 92 ucg->cg_time = ufs_get_seconds(sb);93 94 is_directory = S_ISDIR(inode->i_mode);95 96 if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))97 ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino);98 else {99 ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);100 if (ino < ucpi->c_irotor)101 ucpi->c_irotor = ino;102 fs32_add(sb, &ucg->cg_cs.cs_nifree, 1);103 uspi->cs_total.cs_nifree++;104 fs32_add(sb, &UFS_SB(sb)->fs_cs(cg).cs_nifree, 1);105 106 if (is_directory) {107 fs32_sub(sb, &ucg->cg_cs.cs_ndir, 1);108 uspi->cs_total.cs_ndir--;109 fs32_sub(sb, &UFS_SB(sb)->fs_cs(cg).cs_ndir, 1);110 }111 }112 113 ubh_mark_buffer_dirty (USPI_UBH(uspi));114 ubh_mark_buffer_dirty (UCPI_UBH(ucpi));115 if (sb->s_flags & SB_SYNCHRONOUS)116 ubh_sync_block(UCPI_UBH(ucpi));117 118 ufs_mark_sb_dirty(sb);119 mutex_unlock(&UFS_SB(sb)->s_lock);120 UFSD("EXIT\n");121}122 123/*124 * Nullify new chunk of inodes,125 * BSD people also set ui_gen field of inode126 * during nullification, but we not care about127 * that because of linux ufs do not support NFS128 */129static void ufs2_init_inodes_chunk(struct super_block *sb,130 struct ufs_cg_private_info *ucpi,131 struct ufs_cylinder_group *ucg)132{133 struct buffer_head *bh;134 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;135 sector_t beg = uspi->s_sbbase +136 ufs_inotofsba(ucpi->c_cgx * uspi->s_ipg +137 fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk));138 sector_t end = beg + uspi->s_fpb;139 140 UFSD("ENTER cgno %d\n", ucpi->c_cgx);141 142 for (; beg < end; ++beg) {143 bh = sb_getblk(sb, beg);144 lock_buffer(bh);145 memset(bh->b_data, 0, sb->s_blocksize);146 set_buffer_uptodate(bh);147 mark_buffer_dirty(bh);148 unlock_buffer(bh);149 if (sb->s_flags & SB_SYNCHRONOUS)150 sync_dirty_buffer(bh);151 brelse(bh);152 }153 154 fs32_add(sb, &ucg->cg_u.cg_u2.cg_initediblk, uspi->s_inopb);155 ubh_mark_buffer_dirty(UCPI_UBH(ucpi));156 if (sb->s_flags & SB_SYNCHRONOUS)157 ubh_sync_block(UCPI_UBH(ucpi));158 159 UFSD("EXIT\n");160}161 162/*163 * There are two policies for allocating an inode. If the new inode is164 * a directory, then a forward search is made for a block group with both165 * free space and a low directory-to-inode ratio; if that fails, then of166 * the groups with above-average free space, that group with the fewest167 * directories already is chosen.168 *169 * For other inodes, search forward from the parent directory's block170 * group to find a free inode.171 */172struct inode *ufs_new_inode(struct inode *dir, umode_t mode)173{174 struct super_block * sb;175 struct ufs_sb_info * sbi;176 struct ufs_sb_private_info * uspi;177 struct ufs_cg_private_info * ucpi;178 struct ufs_cylinder_group * ucg;179 struct inode * inode;180 struct timespec64 ts;181 unsigned cg, bit, i, j, start;182 struct ufs_inode_info *ufsi;183 int err = -ENOSPC;184 185 UFSD("ENTER\n");186 187 /* Cannot create files in a deleted directory */188 if (!dir || !dir->i_nlink)189 return ERR_PTR(-EPERM);190 sb = dir->i_sb;191 inode = new_inode(sb);192 if (!inode)193 return ERR_PTR(-ENOMEM);194 ufsi = UFS_I(inode);195 sbi = UFS_SB(sb);196 uspi = sbi->s_uspi;197 198 mutex_lock(&sbi->s_lock);199 200 /*201 * Try to place the inode in its parent directory202 */203 i = ufs_inotocg(dir->i_ino);204 if (sbi->fs_cs(i).cs_nifree) {205 cg = i;206 goto cg_found;207 }208 209 /*210 * Use a quadratic hash to find a group with a free inode211 */212 for ( j = 1; j < uspi->s_ncg; j <<= 1 ) {213 i += j;214 if (i >= uspi->s_ncg)215 i -= uspi->s_ncg;216 if (sbi->fs_cs(i).cs_nifree) {217 cg = i;218 goto cg_found;219 }220 }221 222 /*223 * That failed: try linear search for a free inode224 */225 i = ufs_inotocg(dir->i_ino) + 1;226 for (j = 2; j < uspi->s_ncg; j++) {227 i++;228 if (i >= uspi->s_ncg)229 i = 0;230 if (sbi->fs_cs(i).cs_nifree) {231 cg = i;232 goto cg_found;233 }234 }235 236 goto failed;237 238cg_found:239 ucpi = ufs_load_cylinder (sb, cg);240 if (!ucpi) {241 err = -EIO;242 goto failed;243 }244 ucg = ubh_get_ucg(UCPI_UBH(ucpi));245 if (!ufs_cg_chkmagic(sb, ucg)) 246 ufs_panic (sb, "ufs_new_inode", "internal error, bad cg magic number");247 248 start = ucpi->c_irotor;249 bit = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, uspi->s_ipg, start);250 if (!(bit < uspi->s_ipg)) {251 bit = ubh_find_first_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, start);252 if (!(bit < start)) {253 ufs_error (sb, "ufs_new_inode",254 "cylinder group %u corrupted - error in inode bitmap\n", cg);255 err = -EIO;256 goto failed;257 }258 }259 UFSD("start = %u, bit = %u, ipg = %u\n", start, bit, uspi->s_ipg);260 if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))261 ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);262 else {263 ufs_panic (sb, "ufs_new_inode", "internal error");264 err = -EIO;265 goto failed;266 }267 268 if (uspi->fs_magic == UFS2_MAGIC) {269 u32 initediblk = fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk);270 271 if (bit + uspi->s_inopb > initediblk &&272 initediblk < fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_niblk))273 ufs2_init_inodes_chunk(sb, ucpi, ucg);274 }275 276 fs32_sub(sb, &ucg->cg_cs.cs_nifree, 1);277 uspi->cs_total.cs_nifree--;278 fs32_sub(sb, &sbi->fs_cs(cg).cs_nifree, 1);279 280 if (S_ISDIR(mode)) {281 fs32_add(sb, &ucg->cg_cs.cs_ndir, 1);282 uspi->cs_total.cs_ndir++;283 fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1);284 }285 ubh_mark_buffer_dirty (USPI_UBH(uspi));286 ubh_mark_buffer_dirty (UCPI_UBH(ucpi));287 if (sb->s_flags & SB_SYNCHRONOUS)288 ubh_sync_block(UCPI_UBH(ucpi));289 ufs_mark_sb_dirty(sb);290 291 inode->i_ino = cg * uspi->s_ipg + bit;292 inode_init_owner(&nop_mnt_idmap, inode, dir, mode);293 inode->i_blocks = 0;294 inode->i_generation = 0;295 simple_inode_init_ts(inode);296 ufsi->i_flags = UFS_I(dir)->i_flags;297 ufsi->i_lastfrag = 0;298 ufsi->i_shadow = 0;299 ufsi->i_osync = 0;300 ufsi->i_oeftflag = 0;301 ufsi->i_dir_start_lookup = 0;302 memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1));303 if (insert_inode_locked(inode) < 0) {304 err = -EIO;305 goto failed;306 }307 mark_inode_dirty(inode);308 309 if (uspi->fs_magic == UFS2_MAGIC) {310 struct buffer_head *bh;311 struct ufs2_inode *ufs2_inode;312 313 /*314 * setup birth date, we do it here because of there is no sense315 * to hold it in struct ufs_inode_info, and lose 64 bit316 */317 bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));318 if (!bh) {319 ufs_warning(sb, "ufs_read_inode",320 "unable to read inode %lu\n",321 inode->i_ino);322 err = -EIO;323 goto fail_remove_inode;324 }325 lock_buffer(bh);326 ufs2_inode = (struct ufs2_inode *)bh->b_data;327 ufs2_inode += ufs_inotofsbo(inode->i_ino);328 ktime_get_real_ts64(&ts);329 ufs2_inode->ui_birthtime = cpu_to_fs64(sb, ts.tv_sec);330 ufs2_inode->ui_birthnsec = cpu_to_fs32(sb, ts.tv_nsec);331 mark_buffer_dirty(bh);332 unlock_buffer(bh);333 if (sb->s_flags & SB_SYNCHRONOUS)334 sync_dirty_buffer(bh);335 brelse(bh);336 }337 mutex_unlock(&sbi->s_lock);338 339 UFSD("allocating inode %lu\n", inode->i_ino);340 UFSD("EXIT\n");341 return inode;342 343fail_remove_inode:344 mutex_unlock(&sbi->s_lock);345 clear_nlink(inode);346 discard_new_inode(inode);347 UFSD("EXIT (FAILED): err %d\n", err);348 return ERR_PTR(err);349failed:350 mutex_unlock(&sbi->s_lock);351 make_bad_inode(inode);352 iput (inode);353 UFSD("EXIT (FAILED): err %d\n", err);354 return ERR_PTR(err);355}356