1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/ext2/super.c
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
12 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
20 #include <linux/module.h>
21 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/blkdev.h>
26 #include <linux/parser.h>
27 #include <linux/random.h>
28 #include <linux/buffer_head.h>
29 #include <linux/exportfs.h>
30 #include <linux/vfs.h>
31 #include <linux/seq_file.h>
32 #include <linux/mount.h>
33 #include <linux/log2.h>
34 #include <linux/quotaops.h>
35 #include <linux/uaccess.h>
36 #include <linux/dax.h>
37 #include <linux/iversion.h>
42 static void ext2_write_super(struct super_block *sb);
43 static int ext2_remount (struct super_block * sb, int * flags, char * data);
44 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
45 static int ext2_sync_fs(struct super_block *sb, int wait);
46 static int ext2_freeze(struct super_block *sb);
47 static int ext2_unfreeze(struct super_block *sb);
49 void ext2_error(struct super_block *sb, const char *function,
54 struct ext2_sb_info *sbi = EXT2_SB(sb);
55 struct ext2_super_block *es = sbi->s_es;
58 spin_lock(&sbi->s_lock);
59 sbi->s_mount_state |= EXT2_ERROR_FS;
60 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
61 spin_unlock(&sbi->s_lock);
62 ext2_sync_super(sb, es, 1);
70 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
71 sb->s_id, function, &vaf);
75 if (test_opt(sb, ERRORS_PANIC))
76 panic("EXT2-fs: panic from previous error\n");
77 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) {
78 ext2_msg(sb, KERN_CRIT,
79 "error: remounting filesystem read-only");
80 sb->s_flags |= SB_RDONLY;
84 void ext2_msg(struct super_block *sb, const char *prefix,
95 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
101 * This must be called with sbi->s_lock held.
103 void ext2_update_dynamic_rev(struct super_block *sb)
105 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
107 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
110 ext2_msg(sb, KERN_WARNING,
111 "warning: updating to rev %d because of "
112 "new feature flag, running e2fsck is recommended",
115 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
116 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
117 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
118 /* leave es->s_feature_*compat flags alone */
119 /* es->s_uuid will be set by e2fsck if empty */
122 * The rest of the superblock fields should be zero, and if not it
123 * means they are likely already in use, so leave them alone. We
124 * can leave it up to e2fsck to clean up any inconsistencies there.
129 static int ext2_quota_off(struct super_block *sb, int type);
131 static void ext2_quota_off_umount(struct super_block *sb)
135 for (type = 0; type < MAXQUOTAS; type++)
136 ext2_quota_off(sb, type);
139 static inline void ext2_quota_off_umount(struct super_block *sb)
144 static void ext2_put_super (struct super_block * sb)
148 struct ext2_sb_info *sbi = EXT2_SB(sb);
150 ext2_quota_off_umount(sb);
152 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
153 sbi->s_ea_block_cache = NULL;
155 if (!sb_rdonly(sb)) {
156 struct ext2_super_block *es = sbi->s_es;
158 spin_lock(&sbi->s_lock);
159 es->s_state = cpu_to_le16(sbi->s_mount_state);
160 spin_unlock(&sbi->s_lock);
161 ext2_sync_super(sb, es, 1);
163 db_count = sbi->s_gdb_count;
164 for (i = 0; i < db_count; i++)
165 brelse(sbi->s_group_desc[i]);
166 kfree(sbi->s_group_desc);
168 percpu_counter_destroy(&sbi->s_freeblocks_counter);
169 percpu_counter_destroy(&sbi->s_freeinodes_counter);
170 percpu_counter_destroy(&sbi->s_dirs_counter);
172 sb->s_fs_info = NULL;
173 kfree(sbi->s_blockgroup_lock);
174 fs_put_dax(sbi->s_daxdev);
178 static struct kmem_cache * ext2_inode_cachep;
180 static struct inode *ext2_alloc_inode(struct super_block *sb)
182 struct ext2_inode_info *ei;
183 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
186 ei->i_block_alloc_info = NULL;
187 inode_set_iversion(&ei->vfs_inode, 1);
189 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
192 return &ei->vfs_inode;
195 static void ext2_free_in_core_inode(struct inode *inode)
197 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
200 static void init_once(void *foo)
202 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
204 rwlock_init(&ei->i_meta_lock);
205 #ifdef CONFIG_EXT2_FS_XATTR
206 init_rwsem(&ei->xattr_sem);
208 mutex_init(&ei->truncate_mutex);
210 init_rwsem(&ei->dax_sem);
212 inode_init_once(&ei->vfs_inode);
215 static int __init init_inodecache(void)
217 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
218 sizeof(struct ext2_inode_info), 0,
219 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
221 offsetof(struct ext2_inode_info, i_data),
222 sizeof_field(struct ext2_inode_info, i_data),
224 if (ext2_inode_cachep == NULL)
229 static void destroy_inodecache(void)
232 * Make sure all delayed rcu free inodes are flushed before we
236 kmem_cache_destroy(ext2_inode_cachep);
239 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
241 struct super_block *sb = root->d_sb;
242 struct ext2_sb_info *sbi = EXT2_SB(sb);
243 struct ext2_super_block *es = sbi->s_es;
244 unsigned long def_mount_opts;
246 spin_lock(&sbi->s_lock);
247 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
249 if (sbi->s_sb_block != 1)
250 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
251 if (test_opt(sb, MINIX_DF))
252 seq_puts(seq, ",minixdf");
253 if (test_opt(sb, GRPID))
254 seq_puts(seq, ",grpid");
255 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
256 seq_puts(seq, ",nogrpid");
257 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
258 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
259 seq_printf(seq, ",resuid=%u",
260 from_kuid_munged(&init_user_ns, sbi->s_resuid));
262 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
263 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
264 seq_printf(seq, ",resgid=%u",
265 from_kgid_munged(&init_user_ns, sbi->s_resgid));
267 if (test_opt(sb, ERRORS_RO)) {
268 int def_errors = le16_to_cpu(es->s_errors);
270 if (def_errors == EXT2_ERRORS_PANIC ||
271 def_errors == EXT2_ERRORS_CONTINUE) {
272 seq_puts(seq, ",errors=remount-ro");
275 if (test_opt(sb, ERRORS_CONT))
276 seq_puts(seq, ",errors=continue");
277 if (test_opt(sb, ERRORS_PANIC))
278 seq_puts(seq, ",errors=panic");
279 if (test_opt(sb, NO_UID32))
280 seq_puts(seq, ",nouid32");
281 if (test_opt(sb, DEBUG))
282 seq_puts(seq, ",debug");
283 if (test_opt(sb, OLDALLOC))
284 seq_puts(seq, ",oldalloc");
286 #ifdef CONFIG_EXT2_FS_XATTR
287 if (test_opt(sb, XATTR_USER))
288 seq_puts(seq, ",user_xattr");
289 if (!test_opt(sb, XATTR_USER) &&
290 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
291 seq_puts(seq, ",nouser_xattr");
295 #ifdef CONFIG_EXT2_FS_POSIX_ACL
296 if (test_opt(sb, POSIX_ACL))
297 seq_puts(seq, ",acl");
298 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
299 seq_puts(seq, ",noacl");
302 if (test_opt(sb, NOBH))
303 seq_puts(seq, ",nobh");
305 if (test_opt(sb, USRQUOTA))
306 seq_puts(seq, ",usrquota");
308 if (test_opt(sb, GRPQUOTA))
309 seq_puts(seq, ",grpquota");
311 if (test_opt(sb, XIP))
312 seq_puts(seq, ",xip");
314 if (test_opt(sb, DAX))
315 seq_puts(seq, ",dax");
317 if (!test_opt(sb, RESERVATION))
318 seq_puts(seq, ",noreservation");
320 spin_unlock(&sbi->s_lock);
325 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
326 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
327 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
328 const struct path *path);
329 static struct dquot **ext2_get_dquots(struct inode *inode)
331 return EXT2_I(inode)->i_dquot;
334 static const struct quotactl_ops ext2_quotactl_ops = {
335 .quota_on = ext2_quota_on,
336 .quota_off = ext2_quota_off,
337 .quota_sync = dquot_quota_sync,
338 .get_state = dquot_get_state,
339 .set_info = dquot_set_dqinfo,
340 .get_dqblk = dquot_get_dqblk,
341 .set_dqblk = dquot_set_dqblk,
342 .get_nextdqblk = dquot_get_next_dqblk,
346 static const struct super_operations ext2_sops = {
347 .alloc_inode = ext2_alloc_inode,
348 .free_inode = ext2_free_in_core_inode,
349 .write_inode = ext2_write_inode,
350 .evict_inode = ext2_evict_inode,
351 .put_super = ext2_put_super,
352 .sync_fs = ext2_sync_fs,
353 .freeze_fs = ext2_freeze,
354 .unfreeze_fs = ext2_unfreeze,
355 .statfs = ext2_statfs,
356 .remount_fs = ext2_remount,
357 .show_options = ext2_show_options,
359 .quota_read = ext2_quota_read,
360 .quota_write = ext2_quota_write,
361 .get_dquots = ext2_get_dquots,
365 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
366 u64 ino, u32 generation)
370 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
371 return ERR_PTR(-ESTALE);
372 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
373 return ERR_PTR(-ESTALE);
376 * ext2_iget isn't quite right if the inode is currently unallocated!
377 * However ext2_iget currently does appropriate checks to handle stale
378 * inodes so everything is OK.
380 inode = ext2_iget(sb, ino);
382 return ERR_CAST(inode);
383 if (generation && inode->i_generation != generation) {
384 /* we didn't find the right inode.. */
386 return ERR_PTR(-ESTALE);
391 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
392 int fh_len, int fh_type)
394 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
398 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
399 int fh_len, int fh_type)
401 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
405 static const struct export_operations ext2_export_ops = {
406 .fh_to_dentry = ext2_fh_to_dentry,
407 .fh_to_parent = ext2_fh_to_parent,
408 .get_parent = ext2_get_parent,
411 static unsigned long get_sb_block(void **data)
413 unsigned long sb_block;
414 char *options = (char *) *data;
416 if (!options || strncmp(options, "sb=", 3) != 0)
417 return 1; /* Default location */
419 sb_block = simple_strtoul(options, &options, 0);
420 if (*options && *options != ',') {
421 printk("EXT2-fs: Invalid sb specification: %s\n",
427 *data = (void *) options;
432 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
433 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
434 Opt_err_ro, Opt_nouid32, Opt_debug,
435 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
436 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
437 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
440 static const match_table_t tokens = {
441 {Opt_bsd_df, "bsddf"},
442 {Opt_minix_df, "minixdf"},
443 {Opt_grpid, "grpid"},
444 {Opt_grpid, "bsdgroups"},
445 {Opt_nogrpid, "nogrpid"},
446 {Opt_nogrpid, "sysvgroups"},
447 {Opt_resgid, "resgid=%u"},
448 {Opt_resuid, "resuid=%u"},
450 {Opt_err_cont, "errors=continue"},
451 {Opt_err_panic, "errors=panic"},
452 {Opt_err_ro, "errors=remount-ro"},
453 {Opt_nouid32, "nouid32"},
454 {Opt_debug, "debug"},
455 {Opt_oldalloc, "oldalloc"},
456 {Opt_orlov, "orlov"},
458 {Opt_user_xattr, "user_xattr"},
459 {Opt_nouser_xattr, "nouser_xattr"},
461 {Opt_noacl, "noacl"},
464 {Opt_grpquota, "grpquota"},
465 {Opt_ignore, "noquota"},
466 {Opt_quota, "quota"},
467 {Opt_usrquota, "usrquota"},
468 {Opt_reservation, "reservation"},
469 {Opt_noreservation, "noreservation"},
473 static int parse_options(char *options, struct super_block *sb,
474 struct ext2_mount_options *opts)
477 substring_t args[MAX_OPT_ARGS];
485 while ((p = strsep (&options, ",")) != NULL) {
490 token = match_token(p, tokens, args);
493 clear_opt (opts->s_mount_opt, MINIX_DF);
496 set_opt (opts->s_mount_opt, MINIX_DF);
499 set_opt (opts->s_mount_opt, GRPID);
502 clear_opt (opts->s_mount_opt, GRPID);
505 if (match_int(&args[0], &option))
507 uid = make_kuid(current_user_ns(), option);
508 if (!uid_valid(uid)) {
509 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
513 opts->s_resuid = uid;
516 if (match_int(&args[0], &option))
518 gid = make_kgid(current_user_ns(), option);
519 if (!gid_valid(gid)) {
520 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
523 opts->s_resgid = gid;
526 /* handled by get_sb_block() instead of here */
527 /* *sb_block = match_int(&args[0]); */
530 clear_opt (opts->s_mount_opt, ERRORS_CONT);
531 clear_opt (opts->s_mount_opt, ERRORS_RO);
532 set_opt (opts->s_mount_opt, ERRORS_PANIC);
535 clear_opt (opts->s_mount_opt, ERRORS_CONT);
536 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
537 set_opt (opts->s_mount_opt, ERRORS_RO);
540 clear_opt (opts->s_mount_opt, ERRORS_RO);
541 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
542 set_opt (opts->s_mount_opt, ERRORS_CONT);
545 set_opt (opts->s_mount_opt, NO_UID32);
548 set_opt (opts->s_mount_opt, DEBUG);
551 set_opt (opts->s_mount_opt, OLDALLOC);
554 clear_opt (opts->s_mount_opt, OLDALLOC);
557 set_opt (opts->s_mount_opt, NOBH);
559 #ifdef CONFIG_EXT2_FS_XATTR
561 set_opt (opts->s_mount_opt, XATTR_USER);
563 case Opt_nouser_xattr:
564 clear_opt (opts->s_mount_opt, XATTR_USER);
568 case Opt_nouser_xattr:
569 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
573 #ifdef CONFIG_EXT2_FS_POSIX_ACL
575 set_opt(opts->s_mount_opt, POSIX_ACL);
578 clear_opt(opts->s_mount_opt, POSIX_ACL);
583 ext2_msg(sb, KERN_INFO,
584 "(no)acl options not supported");
588 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
589 set_opt(opts->s_mount_opt, XIP);
593 ext2_msg(sb, KERN_WARNING,
594 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
595 set_opt(opts->s_mount_opt, DAX);
597 ext2_msg(sb, KERN_INFO, "dax option not supported");
601 #if defined(CONFIG_QUOTA)
604 set_opt(opts->s_mount_opt, USRQUOTA);
608 set_opt(opts->s_mount_opt, GRPQUOTA);
614 ext2_msg(sb, KERN_INFO,
615 "quota operations not supported");
619 case Opt_reservation:
620 set_opt(opts->s_mount_opt, RESERVATION);
621 ext2_msg(sb, KERN_INFO, "reservations ON");
623 case Opt_noreservation:
624 clear_opt(opts->s_mount_opt, RESERVATION);
625 ext2_msg(sb, KERN_INFO, "reservations OFF");
636 static int ext2_setup_super (struct super_block * sb,
637 struct ext2_super_block * es,
641 struct ext2_sb_info *sbi = EXT2_SB(sb);
643 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
644 ext2_msg(sb, KERN_ERR,
645 "error: revision level too high, "
646 "forcing read-only mode");
651 if (!(sbi->s_mount_state & EXT2_VALID_FS))
652 ext2_msg(sb, KERN_WARNING,
653 "warning: mounting unchecked fs, "
654 "running e2fsck is recommended");
655 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
656 ext2_msg(sb, KERN_WARNING,
657 "warning: mounting fs with errors, "
658 "running e2fsck is recommended");
659 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
660 le16_to_cpu(es->s_mnt_count) >=
661 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
662 ext2_msg(sb, KERN_WARNING,
663 "warning: maximal mount count reached, "
664 "running e2fsck is recommended");
665 else if (le32_to_cpu(es->s_checkinterval) &&
666 (le32_to_cpu(es->s_lastcheck) +
667 le32_to_cpu(es->s_checkinterval) <=
668 ktime_get_real_seconds()))
669 ext2_msg(sb, KERN_WARNING,
670 "warning: checktime reached, "
671 "running e2fsck is recommended");
672 if (!le16_to_cpu(es->s_max_mnt_count))
673 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
674 le16_add_cpu(&es->s_mnt_count, 1);
675 if (test_opt (sb, DEBUG))
676 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
677 "bpg=%lu, ipg=%lu, mo=%04lx]",
678 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
681 EXT2_BLOCKS_PER_GROUP(sb),
682 EXT2_INODES_PER_GROUP(sb),
687 static int ext2_check_descriptors(struct super_block *sb)
690 struct ext2_sb_info *sbi = EXT2_SB(sb);
692 ext2_debug ("Checking group descriptors");
694 for (i = 0; i < sbi->s_groups_count; i++) {
695 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
696 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
697 ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i);
699 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
700 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
702 ext2_error (sb, "ext2_check_descriptors",
703 "Block bitmap for group %d"
704 " not in group (block %lu)!",
705 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
708 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
709 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
711 ext2_error (sb, "ext2_check_descriptors",
712 "Inode bitmap for group %d"
713 " not in group (block %lu)!",
714 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
717 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
718 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
721 ext2_error (sb, "ext2_check_descriptors",
722 "Inode table for group %d"
723 " not in group (block %lu)!",
724 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
732 * Maximal file size. There is a direct, and {,double-,triple-}indirect
733 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
734 * We need to be 1 filesystem block less than the 2^32 sector limit.
736 static loff_t ext2_max_size(int bits)
738 loff_t res = EXT2_NDIR_BLOCKS;
740 unsigned int upper_limit;
741 unsigned int ppb = 1 << (bits-2);
743 /* This is calculated to be the largest file size for a
744 * dense, file such that the total number of
745 * sectors in the file, including data and all indirect blocks,
746 * does not exceed 2^32 -1
747 * __u32 i_blocks representing the total number of
748 * 512 bytes blocks of the file
750 upper_limit = (1LL << 32) - 1;
752 /* total blocks in file system block size */
753 upper_limit >>= (bits - 9);
755 /* Compute how many blocks we can address by block tree */
756 res += 1LL << (bits-2);
757 res += 1LL << (2*(bits-2));
758 res += 1LL << (3*(bits-2));
759 /* Compute how many metadata blocks are needed */
761 meta_blocks += 1 + ppb;
762 meta_blocks += 1 + ppb + ppb * ppb;
763 /* Does block tree limit file size? */
764 if (res + meta_blocks <= upper_limit)
768 /* How many metadata blocks are needed for addressing upper_limit? */
769 upper_limit -= EXT2_NDIR_BLOCKS;
770 /* indirect blocks */
773 /* double indirect blocks */
774 if (upper_limit < ppb * ppb) {
775 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
779 meta_blocks += 1 + ppb;
780 upper_limit -= ppb * ppb;
781 /* tripple indirect blocks for the rest */
782 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
783 DIV_ROUND_UP(upper_limit, ppb*ppb);
787 if (res > MAX_LFS_FILESIZE)
788 res = MAX_LFS_FILESIZE;
793 static unsigned long descriptor_loc(struct super_block *sb,
794 unsigned long logic_sb_block,
797 struct ext2_sb_info *sbi = EXT2_SB(sb);
798 unsigned long bg, first_meta_bg;
800 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
802 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
804 return (logic_sb_block + nr + 1);
805 bg = sbi->s_desc_per_block * nr;
807 return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
810 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
812 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
813 struct buffer_head * bh;
814 struct ext2_sb_info * sbi;
815 struct ext2_super_block * es;
818 unsigned long sb_block = get_sb_block(&data);
819 unsigned long logic_sb_block;
820 unsigned long offset = 0;
821 unsigned long def_mount_opts;
823 int blocksize = BLOCK_SIZE;
828 struct ext2_mount_options opts;
830 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
834 sbi->s_blockgroup_lock =
835 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
836 if (!sbi->s_blockgroup_lock) {
841 sbi->s_sb_block = sb_block;
842 sbi->s_daxdev = dax_dev;
844 spin_lock_init(&sbi->s_lock);
848 * See what the current blocksize for the device is, and
849 * use that as the blocksize. Otherwise (or if the blocksize
850 * is smaller than the default) use the default.
851 * This is important for devices that have a hardware
852 * sectorsize that is larger than the default.
854 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
856 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
861 * If the superblock doesn't start on a hardware sector boundary,
862 * calculate the offset.
864 if (blocksize != BLOCK_SIZE) {
865 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
866 offset = (sb_block*BLOCK_SIZE) % blocksize;
868 logic_sb_block = sb_block;
871 if (!(bh = sb_bread(sb, logic_sb_block))) {
872 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
876 * Note: s_es must be initialized as soon as possible because
877 * some ext2 macro-instructions depend on its value
879 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
881 sb->s_magic = le16_to_cpu(es->s_magic);
883 if (sb->s_magic != EXT2_SUPER_MAGIC)
886 opts.s_mount_opt = 0;
887 /* Set defaults before we parse the mount options */
888 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
889 if (def_mount_opts & EXT2_DEFM_DEBUG)
890 set_opt(opts.s_mount_opt, DEBUG);
891 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
892 set_opt(opts.s_mount_opt, GRPID);
893 if (def_mount_opts & EXT2_DEFM_UID16)
894 set_opt(opts.s_mount_opt, NO_UID32);
895 #ifdef CONFIG_EXT2_FS_XATTR
896 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
897 set_opt(opts.s_mount_opt, XATTR_USER);
899 #ifdef CONFIG_EXT2_FS_POSIX_ACL
900 if (def_mount_opts & EXT2_DEFM_ACL)
901 set_opt(opts.s_mount_opt, POSIX_ACL);
904 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
905 set_opt(opts.s_mount_opt, ERRORS_PANIC);
906 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
907 set_opt(opts.s_mount_opt, ERRORS_CONT);
909 set_opt(opts.s_mount_opt, ERRORS_RO);
911 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
912 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
914 set_opt(opts.s_mount_opt, RESERVATION);
916 if (!parse_options((char *) data, sb, &opts))
919 sbi->s_mount_opt = opts.s_mount_opt;
920 sbi->s_resuid = opts.s_resuid;
921 sbi->s_resgid = opts.s_resgid;
923 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
924 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
925 sb->s_iflags |= SB_I_CGROUPWB;
927 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
928 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
929 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
930 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
931 ext2_msg(sb, KERN_WARNING,
932 "warning: feature flags set on rev 0 fs, "
933 "running e2fsck is recommended");
935 * Check feature flags regardless of the revision level, since we
936 * previously didn't change the revision level when setting the flags,
937 * so there is a chance incompat flags are set on a rev 0 filesystem.
939 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
941 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
942 "unsupported optional features (%x)",
943 le32_to_cpu(features));
946 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
947 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
948 "unsupported optional features (%x)",
949 le32_to_cpu(features));
953 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
955 if (test_opt(sb, DAX)) {
956 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
957 ext2_msg(sb, KERN_ERR,
958 "DAX unsupported by block device. Turning off DAX.");
959 clear_opt(sbi->s_mount_opt, DAX);
963 /* If the blocksize doesn't match, re-read the thing.. */
964 if (sb->s_blocksize != blocksize) {
967 if (!sb_set_blocksize(sb, blocksize)) {
968 ext2_msg(sb, KERN_ERR,
969 "error: bad blocksize %d", blocksize);
973 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
974 offset = (sb_block*BLOCK_SIZE) % blocksize;
975 bh = sb_bread(sb, logic_sb_block);
977 ext2_msg(sb, KERN_ERR, "error: couldn't read"
978 "superblock on 2nd try");
981 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
983 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
984 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
989 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
990 sb->s_max_links = EXT2_LINK_MAX;
991 sb->s_time_min = S32_MIN;
992 sb->s_time_max = S32_MAX;
994 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
995 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
996 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
998 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
999 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1000 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1001 !is_power_of_2(sbi->s_inode_size) ||
1002 (sbi->s_inode_size > blocksize)) {
1003 ext2_msg(sb, KERN_ERR,
1004 "error: unsupported inode size: %d",
1010 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1011 le32_to_cpu(es->s_log_frag_size);
1012 if (sbi->s_frag_size == 0)
1014 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1016 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1017 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1018 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1020 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1021 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1023 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1024 sbi->s_inodes_per_block;
1025 sbi->s_desc_per_block = sb->s_blocksize /
1026 sizeof (struct ext2_group_desc);
1028 sbi->s_mount_state = le16_to_cpu(es->s_state);
1029 sbi->s_addr_per_block_bits =
1030 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1031 sbi->s_desc_per_block_bits =
1032 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1034 if (sb->s_magic != EXT2_SUPER_MAGIC)
1037 if (sb->s_blocksize != bh->b_size) {
1039 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1043 if (sb->s_blocksize != sbi->s_frag_size) {
1044 ext2_msg(sb, KERN_ERR,
1045 "error: fragsize %lu != blocksize %lu"
1046 "(not supported yet)",
1047 sbi->s_frag_size, sb->s_blocksize);
1051 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1052 ext2_msg(sb, KERN_ERR,
1053 "error: #blocks per group too big: %lu",
1054 sbi->s_blocks_per_group);
1057 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1058 ext2_msg(sb, KERN_ERR,
1059 "error: #fragments per group too big: %lu",
1060 sbi->s_frags_per_group);
1063 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
1064 sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1065 ext2_msg(sb, KERN_ERR,
1066 "error: invalid #inodes per group: %lu",
1067 sbi->s_inodes_per_group);
1071 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1073 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1074 le32_to_cpu(es->s_first_data_block) - 1)
1075 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1076 if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group !=
1077 le32_to_cpu(es->s_inodes_count)) {
1078 ext2_msg(sb, KERN_ERR, "error: invalid #inodes: %u vs computed %llu",
1079 le32_to_cpu(es->s_inodes_count),
1080 (u64)sbi->s_groups_count * sbi->s_inodes_per_group);
1083 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1084 EXT2_DESC_PER_BLOCK(sb);
1085 sbi->s_group_desc = kmalloc_array (db_count,
1086 sizeof(struct buffer_head *),
1088 if (sbi->s_group_desc == NULL) {
1090 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1093 bgl_lock_init(sbi->s_blockgroup_lock);
1094 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1095 if (!sbi->s_debts) {
1097 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1098 goto failed_mount_group_desc;
1100 for (i = 0; i < db_count; i++) {
1101 block = descriptor_loc(sb, logic_sb_block, i);
1102 sbi->s_group_desc[i] = sb_bread(sb, block);
1103 if (!sbi->s_group_desc[i]) {
1104 for (j = 0; j < i; j++)
1105 brelse (sbi->s_group_desc[j]);
1106 ext2_msg(sb, KERN_ERR,
1107 "error: unable to read group descriptors");
1108 goto failed_mount_group_desc;
1111 if (!ext2_check_descriptors (sb)) {
1112 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1115 sbi->s_gdb_count = db_count;
1116 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1117 spin_lock_init(&sbi->s_next_gen_lock);
1119 /* per fileystem reservation list head & lock */
1120 spin_lock_init(&sbi->s_rsv_window_lock);
1121 sbi->s_rsv_window_root = RB_ROOT;
1123 * Add a single, static dummy reservation to the start of the
1124 * reservation window list --- it gives us a placeholder for
1125 * append-at-start-of-list which makes the allocation logic
1128 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1129 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1130 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1131 sbi->s_rsv_window_head.rsv_goal_size = 0;
1132 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1134 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1135 ext2_count_free_blocks(sb), GFP_KERNEL);
1137 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1138 ext2_count_free_inodes(sb), GFP_KERNEL);
1141 err = percpu_counter_init(&sbi->s_dirs_counter,
1142 ext2_count_dirs(sb), GFP_KERNEL);
1146 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1150 #ifdef CONFIG_EXT2_FS_XATTR
1151 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1152 if (!sbi->s_ea_block_cache) {
1154 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1159 * set up enough so that it can read an inode
1161 sb->s_op = &ext2_sops;
1162 sb->s_export_op = &ext2_export_ops;
1163 sb->s_xattr = ext2_xattr_handlers;
1166 sb->dq_op = &dquot_operations;
1167 sb->s_qcop = &ext2_quotactl_ops;
1168 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1171 root = ext2_iget(sb, EXT2_ROOT_INO);
1173 ret = PTR_ERR(root);
1176 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1178 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1182 sb->s_root = d_make_root(root);
1184 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1188 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1189 ext2_msg(sb, KERN_WARNING,
1190 "warning: mounting ext3 filesystem as ext2");
1191 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1192 sb->s_flags |= SB_RDONLY;
1193 ext2_write_super(sb);
1198 ext2_msg(sb, KERN_ERR,
1199 "error: can't find an ext2 filesystem on dev %s.",
1203 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1204 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1205 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1206 percpu_counter_destroy(&sbi->s_dirs_counter);
1208 for (i = 0; i < db_count; i++)
1209 brelse(sbi->s_group_desc[i]);
1210 failed_mount_group_desc:
1211 kfree(sbi->s_group_desc);
1212 kfree(sbi->s_debts);
1216 sb->s_fs_info = NULL;
1217 kfree(sbi->s_blockgroup_lock);
1220 fs_put_dax(dax_dev);
1224 static void ext2_clear_super_error(struct super_block *sb)
1226 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1228 if (buffer_write_io_error(sbh)) {
1230 * Oh, dear. A previous attempt to write the
1231 * superblock failed. This could happen because the
1232 * USB device was yanked out. Or it could happen to
1233 * be a transient write error and maybe the block will
1234 * be remapped. Nothing we can do but to retry the
1235 * write and hope for the best.
1237 ext2_msg(sb, KERN_ERR,
1238 "previous I/O error to superblock detected");
1239 clear_buffer_write_io_error(sbh);
1240 set_buffer_uptodate(sbh);
1244 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1247 ext2_clear_super_error(sb);
1248 spin_lock(&EXT2_SB(sb)->s_lock);
1249 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1250 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1251 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1252 /* unlock before we do IO */
1253 spin_unlock(&EXT2_SB(sb)->s_lock);
1254 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1256 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1260 * In the second extended file system, it is not necessary to
1261 * write the super block since we use a mapping of the
1262 * disk super block in a buffer.
1264 * However, this function is still used to set the fs valid
1265 * flags to 0. We need to set this flag to 0 since the fs
1266 * may have been checked while mounted and e2fsck may have
1267 * set s_state to EXT2_VALID_FS after some corrections.
1269 static int ext2_sync_fs(struct super_block *sb, int wait)
1271 struct ext2_sb_info *sbi = EXT2_SB(sb);
1272 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1275 * Write quota structures to quota file, sync_blockdev() will write
1276 * them to disk later
1278 dquot_writeback_dquots(sb, -1);
1280 spin_lock(&sbi->s_lock);
1281 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1282 ext2_debug("setting valid to 0\n");
1283 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1285 spin_unlock(&sbi->s_lock);
1286 ext2_sync_super(sb, es, wait);
1290 static int ext2_freeze(struct super_block *sb)
1292 struct ext2_sb_info *sbi = EXT2_SB(sb);
1295 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1296 * because we have unattached inodes and thus filesystem is not fully
1299 if (atomic_long_read(&sb->s_remove_count)) {
1300 ext2_sync_fs(sb, 1);
1303 /* Set EXT2_FS_VALID flag */
1304 spin_lock(&sbi->s_lock);
1305 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1306 spin_unlock(&sbi->s_lock);
1307 ext2_sync_super(sb, sbi->s_es, 1);
1312 static int ext2_unfreeze(struct super_block *sb)
1314 /* Just write sb to clear EXT2_VALID_FS flag */
1315 ext2_write_super(sb);
1320 static void ext2_write_super(struct super_block *sb)
1323 ext2_sync_fs(sb, 1);
1326 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1328 struct ext2_sb_info * sbi = EXT2_SB(sb);
1329 struct ext2_super_block * es;
1330 struct ext2_mount_options new_opts;
1333 sync_filesystem(sb);
1335 spin_lock(&sbi->s_lock);
1336 new_opts.s_mount_opt = sbi->s_mount_opt;
1337 new_opts.s_resuid = sbi->s_resuid;
1338 new_opts.s_resgid = sbi->s_resgid;
1339 spin_unlock(&sbi->s_lock);
1341 if (!parse_options(data, sb, &new_opts))
1344 spin_lock(&sbi->s_lock);
1346 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1347 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1348 "dax flag with busy inodes while remounting");
1349 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1351 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1353 if (*flags & SB_RDONLY) {
1354 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1355 !(sbi->s_mount_state & EXT2_VALID_FS))
1359 * OK, we are remounting a valid rw partition rdonly, so set
1360 * the rdonly flag and then mark the partition as valid again.
1362 es->s_state = cpu_to_le16(sbi->s_mount_state);
1363 es->s_mtime = cpu_to_le32(ktime_get_real_seconds());
1364 spin_unlock(&sbi->s_lock);
1366 err = dquot_suspend(sb, -1);
1370 ext2_sync_super(sb, es, 1);
1372 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1373 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1375 spin_unlock(&sbi->s_lock);
1376 ext2_msg(sb, KERN_WARNING,
1377 "warning: couldn't remount RDWR because of "
1378 "unsupported optional features (%x).",
1383 * Mounting a RDONLY partition read-write, so reread and
1384 * store the current valid flag. (It may have been changed
1385 * by e2fsck since we originally mounted the partition.)
1387 sbi->s_mount_state = le16_to_cpu(es->s_state);
1388 if (!ext2_setup_super (sb, es, 0))
1389 sb->s_flags &= ~SB_RDONLY;
1390 spin_unlock(&sbi->s_lock);
1392 ext2_write_super(sb);
1394 dquot_resume(sb, -1);
1397 spin_lock(&sbi->s_lock);
1399 sbi->s_mount_opt = new_opts.s_mount_opt;
1400 sbi->s_resuid = new_opts.s_resuid;
1401 sbi->s_resgid = new_opts.s_resgid;
1402 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1403 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
1404 spin_unlock(&sbi->s_lock);
1409 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1411 struct super_block *sb = dentry->d_sb;
1412 struct ext2_sb_info *sbi = EXT2_SB(sb);
1413 struct ext2_super_block *es = sbi->s_es;
1416 spin_lock(&sbi->s_lock);
1418 if (test_opt (sb, MINIX_DF))
1419 sbi->s_overhead_last = 0;
1420 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1421 unsigned long i, overhead = 0;
1425 * Compute the overhead (FS structures). This is constant
1426 * for a given filesystem unless the number of block groups
1427 * changes so we cache the previous value until it does.
1431 * All of the blocks before first_data_block are
1434 overhead = le32_to_cpu(es->s_first_data_block);
1437 * Add the overhead attributed to the superblock and
1438 * block group descriptors. If the sparse superblocks
1439 * feature is turned on, then not all groups have this.
1441 for (i = 0; i < sbi->s_groups_count; i++)
1442 overhead += ext2_bg_has_super(sb, i) +
1443 ext2_bg_num_gdb(sb, i);
1446 * Every block group has an inode bitmap, a block
1447 * bitmap, and an inode table.
1449 overhead += (sbi->s_groups_count *
1450 (2 + sbi->s_itb_per_group));
1451 sbi->s_overhead_last = overhead;
1453 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1456 buf->f_type = EXT2_SUPER_MAGIC;
1457 buf->f_bsize = sb->s_blocksize;
1458 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1459 buf->f_bfree = ext2_count_free_blocks(sb);
1460 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1461 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1462 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1464 buf->f_files = le32_to_cpu(es->s_inodes_count);
1465 buf->f_ffree = ext2_count_free_inodes(sb);
1466 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1467 buf->f_namelen = EXT2_NAME_LEN;
1468 fsid = le64_to_cpup((void *)es->s_uuid) ^
1469 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1470 buf->f_fsid = u64_to_fsid(fsid);
1471 spin_unlock(&sbi->s_lock);
1475 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1476 int flags, const char *dev_name, void *data)
1478 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1483 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1484 * acquiring the locks... As quota files are never truncated and quota code
1485 * itself serializes the operations (and no one else should touch the files)
1486 * we don't have to be afraid of races */
1487 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1488 size_t len, loff_t off)
1490 struct inode *inode = sb_dqopt(sb)->files[type];
1491 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1493 int offset = off & (sb->s_blocksize - 1);
1496 struct buffer_head tmp_bh;
1497 struct buffer_head *bh;
1498 loff_t i_size = i_size_read(inode);
1502 if (off+len > i_size)
1505 while (toread > 0) {
1506 tocopy = sb->s_blocksize - offset < toread ?
1507 sb->s_blocksize - offset : toread;
1510 tmp_bh.b_size = sb->s_blocksize;
1511 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1514 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1515 memset(data, 0, tocopy);
1517 bh = sb_bread(sb, tmp_bh.b_blocknr);
1520 memcpy(data, bh->b_data+offset, tocopy);
1531 /* Write to quotafile */
1532 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1533 const char *data, size_t len, loff_t off)
1535 struct inode *inode = sb_dqopt(sb)->files[type];
1536 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1538 int offset = off & (sb->s_blocksize - 1);
1540 size_t towrite = len;
1541 struct buffer_head tmp_bh;
1542 struct buffer_head *bh;
1544 while (towrite > 0) {
1545 tocopy = sb->s_blocksize - offset < towrite ?
1546 sb->s_blocksize - offset : towrite;
1549 tmp_bh.b_size = sb->s_blocksize;
1550 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1553 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1554 bh = sb_bread(sb, tmp_bh.b_blocknr);
1556 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1557 if (unlikely(!bh)) {
1562 memcpy(bh->b_data+offset, data, tocopy);
1563 flush_dcache_page(bh->b_page);
1564 set_buffer_uptodate(bh);
1565 mark_buffer_dirty(bh);
1576 if (inode->i_size < off+len-towrite)
1577 i_size_write(inode, off+len-towrite);
1578 inode_inc_iversion(inode);
1579 inode->i_mtime = inode->i_ctime = current_time(inode);
1580 mark_inode_dirty(inode);
1581 return len - towrite;
1584 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1585 const struct path *path)
1588 struct inode *inode;
1590 err = dquot_quota_on(sb, type, format_id, path);
1594 inode = d_inode(path->dentry);
1596 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1597 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1598 S_NOATIME | S_IMMUTABLE);
1599 inode_unlock(inode);
1600 mark_inode_dirty(inode);
1605 static int ext2_quota_off(struct super_block *sb, int type)
1607 struct inode *inode = sb_dqopt(sb)->files[type];
1610 if (!inode || !igrab(inode))
1613 err = dquot_quota_off(sb, type);
1618 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1619 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1620 inode_unlock(inode);
1621 mark_inode_dirty(inode);
1626 return dquot_quota_off(sb, type);
1631 static struct file_system_type ext2_fs_type = {
1632 .owner = THIS_MODULE,
1634 .mount = ext2_mount,
1635 .kill_sb = kill_block_super,
1636 .fs_flags = FS_REQUIRES_DEV,
1638 MODULE_ALIAS_FS("ext2");
1640 static int __init init_ext2_fs(void)
1644 err = init_inodecache();
1647 err = register_filesystem(&ext2_fs_type);
1652 destroy_inodecache();
1656 static void __exit exit_ext2_fs(void)
1658 unregister_filesystem(&ext2_fs_type);
1659 destroy_inodecache();
1662 MODULE_AUTHOR("Remy Card and others");
1663 MODULE_DESCRIPTION("Second Extended Filesystem");
1664 MODULE_LICENSE("GPL");
1665 module_init(init_ext2_fs)
1666 module_exit(exit_ext2_fs)