2 * linux/fs/ext2/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/blkdev.h>
25 #include <linux/parser.h>
26 #include <linux/random.h>
27 #include <linux/buffer_head.h>
28 #include <linux/exportfs.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <linux/log2.h>
33 #include <linux/quotaops.h>
34 #include <linux/uaccess.h>
35 #include <linux/dax.h>
36 #include <linux/iversion.h>
41 static void ext2_write_super(struct super_block *sb);
42 static int ext2_remount (struct super_block * sb, int * flags, char * data);
43 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
44 static int ext2_sync_fs(struct super_block *sb, int wait);
45 static int ext2_freeze(struct super_block *sb);
46 static int ext2_unfreeze(struct super_block *sb);
48 void ext2_error(struct super_block *sb, const char *function,
53 struct ext2_sb_info *sbi = EXT2_SB(sb);
54 struct ext2_super_block *es = sbi->s_es;
57 spin_lock(&sbi->s_lock);
58 sbi->s_mount_state |= EXT2_ERROR_FS;
59 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
60 spin_unlock(&sbi->s_lock);
61 ext2_sync_super(sb, es, 1);
69 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
70 sb->s_id, function, &vaf);
74 if (test_opt(sb, ERRORS_PANIC))
75 panic("EXT2-fs: panic from previous error\n");
76 if (test_opt(sb, ERRORS_RO)) {
77 ext2_msg(sb, KERN_CRIT,
78 "error: remounting filesystem read-only");
79 sb->s_flags |= SB_RDONLY;
83 void ext2_msg(struct super_block *sb, const char *prefix,
94 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
100 * This must be called with sbi->s_lock held.
102 void ext2_update_dynamic_rev(struct super_block *sb)
104 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
106 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
109 ext2_msg(sb, KERN_WARNING,
110 "warning: updating to rev %d because of "
111 "new feature flag, running e2fsck is recommended",
114 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
115 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
116 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
117 /* leave es->s_feature_*compat flags alone */
118 /* es->s_uuid will be set by e2fsck if empty */
121 * The rest of the superblock fields should be zero, and if not it
122 * means they are likely already in use, so leave them alone. We
123 * can leave it up to e2fsck to clean up any inconsistencies there.
128 static int ext2_quota_off(struct super_block *sb, int type);
130 static void ext2_quota_off_umount(struct super_block *sb)
134 for (type = 0; type < MAXQUOTAS; type++)
135 ext2_quota_off(sb, type);
138 static inline void ext2_quota_off_umount(struct super_block *sb)
143 static void ext2_put_super (struct super_block * sb)
147 struct ext2_sb_info *sbi = EXT2_SB(sb);
149 ext2_quota_off_umount(sb);
151 if (sbi->s_ea_block_cache) {
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 if (sbi->s_group_desc[i])
166 brelse (sbi->s_group_desc[i]);
167 kfree(sbi->s_group_desc);
169 percpu_counter_destroy(&sbi->s_freeblocks_counter);
170 percpu_counter_destroy(&sbi->s_freeinodes_counter);
171 percpu_counter_destroy(&sbi->s_dirs_counter);
173 sb->s_fs_info = NULL;
174 kfree(sbi->s_blockgroup_lock);
175 fs_put_dax(sbi->s_daxdev);
179 static struct kmem_cache * ext2_inode_cachep;
181 static struct inode *ext2_alloc_inode(struct super_block *sb)
183 struct ext2_inode_info *ei;
184 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
187 ei->i_block_alloc_info = NULL;
188 inode_set_iversion(&ei->vfs_inode, 1);
190 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
193 return &ei->vfs_inode;
196 static void ext2_i_callback(struct rcu_head *head)
198 struct inode *inode = container_of(head, struct inode, i_rcu);
199 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
202 static void ext2_destroy_inode(struct inode *inode)
204 call_rcu(&inode->i_rcu, ext2_i_callback);
207 static void init_once(void *foo)
209 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
211 rwlock_init(&ei->i_meta_lock);
212 #ifdef CONFIG_EXT2_FS_XATTR
213 init_rwsem(&ei->xattr_sem);
215 mutex_init(&ei->truncate_mutex);
217 init_rwsem(&ei->dax_sem);
219 inode_init_once(&ei->vfs_inode);
222 static int __init init_inodecache(void)
224 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
225 sizeof(struct ext2_inode_info), 0,
226 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
228 offsetof(struct ext2_inode_info, i_data),
229 sizeof_field(struct ext2_inode_info, i_data),
231 if (ext2_inode_cachep == NULL)
236 static void destroy_inodecache(void)
239 * Make sure all delayed rcu free inodes are flushed before we
243 kmem_cache_destroy(ext2_inode_cachep);
246 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
248 struct super_block *sb = root->d_sb;
249 struct ext2_sb_info *sbi = EXT2_SB(sb);
250 struct ext2_super_block *es = sbi->s_es;
251 unsigned long def_mount_opts;
253 spin_lock(&sbi->s_lock);
254 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
256 if (sbi->s_sb_block != 1)
257 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
258 if (test_opt(sb, MINIX_DF))
259 seq_puts(seq, ",minixdf");
260 if (test_opt(sb, GRPID))
261 seq_puts(seq, ",grpid");
262 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
263 seq_puts(seq, ",nogrpid");
264 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
265 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
266 seq_printf(seq, ",resuid=%u",
267 from_kuid_munged(&init_user_ns, sbi->s_resuid));
269 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
270 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
271 seq_printf(seq, ",resgid=%u",
272 from_kgid_munged(&init_user_ns, sbi->s_resgid));
274 if (test_opt(sb, ERRORS_RO)) {
275 int def_errors = le16_to_cpu(es->s_errors);
277 if (def_errors == EXT2_ERRORS_PANIC ||
278 def_errors == EXT2_ERRORS_CONTINUE) {
279 seq_puts(seq, ",errors=remount-ro");
282 if (test_opt(sb, ERRORS_CONT))
283 seq_puts(seq, ",errors=continue");
284 if (test_opt(sb, ERRORS_PANIC))
285 seq_puts(seq, ",errors=panic");
286 if (test_opt(sb, NO_UID32))
287 seq_puts(seq, ",nouid32");
288 if (test_opt(sb, DEBUG))
289 seq_puts(seq, ",debug");
290 if (test_opt(sb, OLDALLOC))
291 seq_puts(seq, ",oldalloc");
293 #ifdef CONFIG_EXT2_FS_XATTR
294 if (test_opt(sb, XATTR_USER))
295 seq_puts(seq, ",user_xattr");
296 if (!test_opt(sb, XATTR_USER) &&
297 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
298 seq_puts(seq, ",nouser_xattr");
302 #ifdef CONFIG_EXT2_FS_POSIX_ACL
303 if (test_opt(sb, POSIX_ACL))
304 seq_puts(seq, ",acl");
305 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
306 seq_puts(seq, ",noacl");
309 if (test_opt(sb, NOBH))
310 seq_puts(seq, ",nobh");
312 #if defined(CONFIG_QUOTA)
313 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
314 seq_puts(seq, ",usrquota");
316 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
317 seq_puts(seq, ",grpquota");
321 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
322 seq_puts(seq, ",xip");
323 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
324 seq_puts(seq, ",dax");
327 if (!test_opt(sb, RESERVATION))
328 seq_puts(seq, ",noreservation");
330 spin_unlock(&sbi->s_lock);
335 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
336 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
337 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
338 const struct path *path);
339 static struct dquot **ext2_get_dquots(struct inode *inode)
341 return EXT2_I(inode)->i_dquot;
344 static const struct quotactl_ops ext2_quotactl_ops = {
345 .quota_on = ext2_quota_on,
346 .quota_off = ext2_quota_off,
347 .quota_sync = dquot_quota_sync,
348 .get_state = dquot_get_state,
349 .set_info = dquot_set_dqinfo,
350 .get_dqblk = dquot_get_dqblk,
351 .set_dqblk = dquot_set_dqblk,
352 .get_nextdqblk = dquot_get_next_dqblk,
356 static const struct super_operations ext2_sops = {
357 .alloc_inode = ext2_alloc_inode,
358 .destroy_inode = ext2_destroy_inode,
359 .write_inode = ext2_write_inode,
360 .evict_inode = ext2_evict_inode,
361 .put_super = ext2_put_super,
362 .sync_fs = ext2_sync_fs,
363 .freeze_fs = ext2_freeze,
364 .unfreeze_fs = ext2_unfreeze,
365 .statfs = ext2_statfs,
366 .remount_fs = ext2_remount,
367 .show_options = ext2_show_options,
369 .quota_read = ext2_quota_read,
370 .quota_write = ext2_quota_write,
371 .get_dquots = ext2_get_dquots,
375 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
376 u64 ino, u32 generation)
380 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
381 return ERR_PTR(-ESTALE);
382 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
383 return ERR_PTR(-ESTALE);
386 * ext2_iget isn't quite right if the inode is currently unallocated!
387 * However ext2_iget currently does appropriate checks to handle stale
388 * inodes so everything is OK.
390 inode = ext2_iget(sb, ino);
392 return ERR_CAST(inode);
393 if (generation && inode->i_generation != generation) {
394 /* we didn't find the right inode.. */
396 return ERR_PTR(-ESTALE);
401 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
402 int fh_len, int fh_type)
404 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
408 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
409 int fh_len, int fh_type)
411 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
415 static const struct export_operations ext2_export_ops = {
416 .fh_to_dentry = ext2_fh_to_dentry,
417 .fh_to_parent = ext2_fh_to_parent,
418 .get_parent = ext2_get_parent,
421 static unsigned long get_sb_block(void **data)
423 unsigned long sb_block;
424 char *options = (char *) *data;
426 if (!options || strncmp(options, "sb=", 3) != 0)
427 return 1; /* Default location */
429 sb_block = simple_strtoul(options, &options, 0);
430 if (*options && *options != ',') {
431 printk("EXT2-fs: Invalid sb specification: %s\n",
437 *data = (void *) options;
442 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
443 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
444 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
445 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
446 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
447 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
450 static const match_table_t tokens = {
451 {Opt_bsd_df, "bsddf"},
452 {Opt_minix_df, "minixdf"},
453 {Opt_grpid, "grpid"},
454 {Opt_grpid, "bsdgroups"},
455 {Opt_nogrpid, "nogrpid"},
456 {Opt_nogrpid, "sysvgroups"},
457 {Opt_resgid, "resgid=%u"},
458 {Opt_resuid, "resuid=%u"},
460 {Opt_err_cont, "errors=continue"},
461 {Opt_err_panic, "errors=panic"},
462 {Opt_err_ro, "errors=remount-ro"},
463 {Opt_nouid32, "nouid32"},
464 {Opt_nocheck, "check=none"},
465 {Opt_nocheck, "nocheck"},
466 {Opt_debug, "debug"},
467 {Opt_oldalloc, "oldalloc"},
468 {Opt_orlov, "orlov"},
470 {Opt_user_xattr, "user_xattr"},
471 {Opt_nouser_xattr, "nouser_xattr"},
473 {Opt_noacl, "noacl"},
476 {Opt_grpquota, "grpquota"},
477 {Opt_ignore, "noquota"},
478 {Opt_quota, "quota"},
479 {Opt_usrquota, "usrquota"},
480 {Opt_reservation, "reservation"},
481 {Opt_noreservation, "noreservation"},
485 static int parse_options(char *options, struct super_block *sb,
486 struct ext2_mount_options *opts)
489 substring_t args[MAX_OPT_ARGS];
497 while ((p = strsep (&options, ",")) != NULL) {
502 token = match_token(p, tokens, args);
505 clear_opt (opts->s_mount_opt, MINIX_DF);
508 set_opt (opts->s_mount_opt, MINIX_DF);
511 set_opt (opts->s_mount_opt, GRPID);
514 clear_opt (opts->s_mount_opt, GRPID);
517 if (match_int(&args[0], &option))
519 uid = make_kuid(current_user_ns(), option);
520 if (!uid_valid(uid)) {
521 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
525 opts->s_resuid = uid;
528 if (match_int(&args[0], &option))
530 gid = make_kgid(current_user_ns(), option);
531 if (!gid_valid(gid)) {
532 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
535 opts->s_resgid = gid;
538 /* handled by get_sb_block() instead of here */
539 /* *sb_block = match_int(&args[0]); */
542 clear_opt (opts->s_mount_opt, ERRORS_CONT);
543 clear_opt (opts->s_mount_opt, ERRORS_RO);
544 set_opt (opts->s_mount_opt, ERRORS_PANIC);
547 clear_opt (opts->s_mount_opt, ERRORS_CONT);
548 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
549 set_opt (opts->s_mount_opt, ERRORS_RO);
552 clear_opt (opts->s_mount_opt, ERRORS_RO);
553 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
554 set_opt (opts->s_mount_opt, ERRORS_CONT);
557 set_opt (opts->s_mount_opt, NO_UID32);
560 ext2_msg(sb, KERN_WARNING,
561 "Option nocheck/check=none is deprecated and"
562 " will be removed in June 2020.");
563 clear_opt (opts->s_mount_opt, CHECK);
566 set_opt (opts->s_mount_opt, DEBUG);
569 set_opt (opts->s_mount_opt, OLDALLOC);
572 clear_opt (opts->s_mount_opt, OLDALLOC);
575 set_opt (opts->s_mount_opt, NOBH);
577 #ifdef CONFIG_EXT2_FS_XATTR
579 set_opt (opts->s_mount_opt, XATTR_USER);
581 case Opt_nouser_xattr:
582 clear_opt (opts->s_mount_opt, XATTR_USER);
586 case Opt_nouser_xattr:
587 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
591 #ifdef CONFIG_EXT2_FS_POSIX_ACL
593 set_opt(opts->s_mount_opt, POSIX_ACL);
596 clear_opt(opts->s_mount_opt, POSIX_ACL);
601 ext2_msg(sb, KERN_INFO,
602 "(no)acl options not supported");
606 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
607 set_opt(opts->s_mount_opt, XIP);
611 ext2_msg(sb, KERN_WARNING,
612 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
613 set_opt(opts->s_mount_opt, DAX);
615 ext2_msg(sb, KERN_INFO, "dax option not supported");
619 #if defined(CONFIG_QUOTA)
622 set_opt(opts->s_mount_opt, USRQUOTA);
626 set_opt(opts->s_mount_opt, GRPQUOTA);
632 ext2_msg(sb, KERN_INFO,
633 "quota operations not supported");
637 case Opt_reservation:
638 set_opt(opts->s_mount_opt, RESERVATION);
639 ext2_msg(sb, KERN_INFO, "reservations ON");
641 case Opt_noreservation:
642 clear_opt(opts->s_mount_opt, RESERVATION);
643 ext2_msg(sb, KERN_INFO, "reservations OFF");
654 static int ext2_setup_super (struct super_block * sb,
655 struct ext2_super_block * es,
659 struct ext2_sb_info *sbi = EXT2_SB(sb);
661 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
662 ext2_msg(sb, KERN_ERR,
663 "error: revision level too high, "
664 "forcing read-only mode");
669 if (!(sbi->s_mount_state & EXT2_VALID_FS))
670 ext2_msg(sb, KERN_WARNING,
671 "warning: mounting unchecked fs, "
672 "running e2fsck is recommended");
673 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
674 ext2_msg(sb, KERN_WARNING,
675 "warning: mounting fs with errors, "
676 "running e2fsck is recommended");
677 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
678 le16_to_cpu(es->s_mnt_count) >=
679 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
680 ext2_msg(sb, KERN_WARNING,
681 "warning: maximal mount count reached, "
682 "running e2fsck is recommended");
683 else if (le32_to_cpu(es->s_checkinterval) &&
684 (le32_to_cpu(es->s_lastcheck) +
685 le32_to_cpu(es->s_checkinterval) <=
686 ktime_get_real_seconds()))
687 ext2_msg(sb, KERN_WARNING,
688 "warning: checktime reached, "
689 "running e2fsck is recommended");
690 if (!le16_to_cpu(es->s_max_mnt_count))
691 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
692 le16_add_cpu(&es->s_mnt_count, 1);
693 if (test_opt (sb, DEBUG))
694 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, gc=%lu, "
695 "bpg=%lu, ipg=%lu, mo=%04lx]",
696 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
698 EXT2_BLOCKS_PER_GROUP(sb),
699 EXT2_INODES_PER_GROUP(sb),
704 static int ext2_check_descriptors(struct super_block *sb)
707 struct ext2_sb_info *sbi = EXT2_SB(sb);
709 ext2_debug ("Checking group descriptors");
711 for (i = 0; i < sbi->s_groups_count; i++) {
712 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
713 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
714 ext2_fsblk_t last_block;
716 if (i == sbi->s_groups_count - 1)
717 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
719 last_block = first_block +
720 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
722 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
723 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
725 ext2_error (sb, "ext2_check_descriptors",
726 "Block bitmap for group %d"
727 " not in group (block %lu)!",
728 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
731 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
732 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
734 ext2_error (sb, "ext2_check_descriptors",
735 "Inode bitmap for group %d"
736 " not in group (block %lu)!",
737 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
740 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
741 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
744 ext2_error (sb, "ext2_check_descriptors",
745 "Inode table for group %d"
746 " not in group (block %lu)!",
747 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
755 * Maximal file size. There is a direct, and {,double-,triple-}indirect
756 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
757 * We need to be 1 filesystem block less than the 2^32 sector limit.
759 static loff_t ext2_max_size(int bits)
761 loff_t res = EXT2_NDIR_BLOCKS;
763 unsigned int upper_limit;
764 unsigned int ppb = 1 << (bits-2);
766 /* This is calculated to be the largest file size for a
767 * dense, file such that the total number of
768 * sectors in the file, including data and all indirect blocks,
769 * does not exceed 2^32 -1
770 * __u32 i_blocks representing the total number of
771 * 512 bytes blocks of the file
773 upper_limit = (1LL << 32) - 1;
775 /* total blocks in file system block size */
776 upper_limit >>= (bits - 9);
778 /* Compute how many blocks we can address by block tree */
779 res += 1LL << (bits-2);
780 res += 1LL << (2*(bits-2));
781 res += 1LL << (3*(bits-2));
782 /* Compute how many metadata blocks are needed */
784 meta_blocks += 1 + ppb;
785 meta_blocks += 1 + ppb + ppb * ppb;
786 /* Does block tree limit file size? */
787 if (res + meta_blocks <= upper_limit)
791 /* How many metadata blocks are needed for addressing upper_limit? */
792 upper_limit -= EXT2_NDIR_BLOCKS;
793 /* indirect blocks */
796 /* double indirect blocks */
797 if (upper_limit < ppb * ppb) {
798 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
802 meta_blocks += 1 + ppb;
803 upper_limit -= ppb * ppb;
804 /* tripple indirect blocks for the rest */
805 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
806 DIV_ROUND_UP(upper_limit, ppb*ppb);
810 if (res > MAX_LFS_FILESIZE)
811 res = MAX_LFS_FILESIZE;
816 static unsigned long descriptor_loc(struct super_block *sb,
817 unsigned long logic_sb_block,
820 struct ext2_sb_info *sbi = EXT2_SB(sb);
821 unsigned long bg, first_meta_bg;
824 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
826 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
828 return (logic_sb_block + nr + 1);
829 bg = sbi->s_desc_per_block * nr;
830 if (ext2_bg_has_super(sb, bg))
833 return ext2_group_first_block_no(sb, bg) + has_super;
836 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
838 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
839 struct buffer_head * bh;
840 struct ext2_sb_info * sbi;
841 struct ext2_super_block * es;
844 unsigned long sb_block = get_sb_block(&data);
845 unsigned long logic_sb_block;
846 unsigned long offset = 0;
847 unsigned long def_mount_opts;
849 int blocksize = BLOCK_SIZE;
854 struct ext2_mount_options opts;
856 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
860 sbi->s_blockgroup_lock =
861 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
862 if (!sbi->s_blockgroup_lock) {
867 sbi->s_sb_block = sb_block;
868 sbi->s_daxdev = dax_dev;
870 spin_lock_init(&sbi->s_lock);
874 * See what the current blocksize for the device is, and
875 * use that as the blocksize. Otherwise (or if the blocksize
876 * is smaller than the default) use the default.
877 * This is important for devices that have a hardware
878 * sectorsize that is larger than the default.
880 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
882 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
887 * If the superblock doesn't start on a hardware sector boundary,
888 * calculate the offset.
890 if (blocksize != BLOCK_SIZE) {
891 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
892 offset = (sb_block*BLOCK_SIZE) % blocksize;
894 logic_sb_block = sb_block;
897 if (!(bh = sb_bread(sb, logic_sb_block))) {
898 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
902 * Note: s_es must be initialized as soon as possible because
903 * some ext2 macro-instructions depend on its value
905 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
907 sb->s_magic = le16_to_cpu(es->s_magic);
909 if (sb->s_magic != EXT2_SUPER_MAGIC)
912 opts.s_mount_opt = 0;
913 /* Set defaults before we parse the mount options */
914 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
915 if (def_mount_opts & EXT2_DEFM_DEBUG)
916 set_opt(opts.s_mount_opt, DEBUG);
917 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
918 set_opt(opts.s_mount_opt, GRPID);
919 if (def_mount_opts & EXT2_DEFM_UID16)
920 set_opt(opts.s_mount_opt, NO_UID32);
921 #ifdef CONFIG_EXT2_FS_XATTR
922 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
923 set_opt(opts.s_mount_opt, XATTR_USER);
925 #ifdef CONFIG_EXT2_FS_POSIX_ACL
926 if (def_mount_opts & EXT2_DEFM_ACL)
927 set_opt(opts.s_mount_opt, POSIX_ACL);
930 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
931 set_opt(opts.s_mount_opt, ERRORS_PANIC);
932 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
933 set_opt(opts.s_mount_opt, ERRORS_CONT);
935 set_opt(opts.s_mount_opt, ERRORS_RO);
937 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
938 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
940 set_opt(opts.s_mount_opt, RESERVATION);
942 if (!parse_options((char *) data, sb, &opts))
945 sbi->s_mount_opt = opts.s_mount_opt;
946 sbi->s_resuid = opts.s_resuid;
947 sbi->s_resgid = opts.s_resgid;
949 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
950 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
952 sb->s_iflags |= SB_I_CGROUPWB;
954 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
955 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
956 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
957 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
958 ext2_msg(sb, KERN_WARNING,
959 "warning: feature flags set on rev 0 fs, "
960 "running e2fsck is recommended");
962 * Check feature flags regardless of the revision level, since we
963 * previously didn't change the revision level when setting the flags,
964 * so there is a chance incompat flags are set on a rev 0 filesystem.
966 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
968 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
969 "unsupported optional features (%x)",
970 le32_to_cpu(features));
973 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
974 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
975 "unsupported optional features (%x)",
976 le32_to_cpu(features));
980 if (le32_to_cpu(es->s_log_block_size) >
981 (EXT2_MAX_BLOCK_LOG_SIZE - BLOCK_SIZE_BITS)) {
982 ext2_msg(sb, KERN_ERR,
983 "Invalid log block size: %u",
984 le32_to_cpu(es->s_log_block_size));
987 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
989 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
990 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
991 ext2_msg(sb, KERN_ERR,
992 "DAX unsupported by block device. Turning off DAX.");
993 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX;
997 /* If the blocksize doesn't match, re-read the thing.. */
998 if (sb->s_blocksize != blocksize) {
1001 if (!sb_set_blocksize(sb, blocksize)) {
1002 ext2_msg(sb, KERN_ERR,
1003 "error: bad blocksize %d", blocksize);
1007 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
1008 offset = (sb_block*BLOCK_SIZE) % blocksize;
1009 bh = sb_bread(sb, logic_sb_block);
1011 ext2_msg(sb, KERN_ERR, "error: couldn't read"
1012 "superblock on 2nd try");
1015 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
1017 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
1018 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
1023 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
1024 sb->s_max_links = EXT2_LINK_MAX;
1026 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
1027 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
1028 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
1030 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1031 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1032 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1033 !is_power_of_2(sbi->s_inode_size) ||
1034 (sbi->s_inode_size > blocksize)) {
1035 ext2_msg(sb, KERN_ERR,
1036 "error: unsupported inode size: %d",
1042 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1043 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1045 if (EXT2_INODE_SIZE(sb) == 0)
1047 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1048 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1050 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1051 sbi->s_inodes_per_block;
1052 sbi->s_desc_per_block = sb->s_blocksize /
1053 sizeof (struct ext2_group_desc);
1055 sbi->s_mount_state = le16_to_cpu(es->s_state);
1056 sbi->s_addr_per_block_bits =
1057 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1058 sbi->s_desc_per_block_bits =
1059 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1061 if (sb->s_magic != EXT2_SUPER_MAGIC)
1064 if (sb->s_blocksize != bh->b_size) {
1066 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1070 if (es->s_log_frag_size != es->s_log_block_size) {
1071 ext2_msg(sb, KERN_ERR,
1072 "error: fragsize log %u != blocksize log %u",
1073 le32_to_cpu(es->s_log_frag_size), sb->s_blocksize_bits);
1077 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1078 ext2_msg(sb, KERN_ERR,
1079 "error: #blocks per group too big: %lu",
1080 sbi->s_blocks_per_group);
1083 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
1084 sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1085 ext2_msg(sb, KERN_ERR,
1086 "error: invalid #inodes per group: %lu",
1087 sbi->s_inodes_per_group);
1091 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1093 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1094 le32_to_cpu(es->s_first_data_block) - 1)
1095 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1096 if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group !=
1097 le32_to_cpu(es->s_inodes_count)) {
1098 ext2_msg(sb, KERN_ERR, "error: invalid #inodes: %u vs computed %llu",
1099 le32_to_cpu(es->s_inodes_count),
1100 (u64)sbi->s_groups_count * sbi->s_inodes_per_group);
1103 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1104 EXT2_DESC_PER_BLOCK(sb);
1105 sbi->s_group_desc = kmalloc_array (db_count,
1106 sizeof(struct buffer_head *),
1108 if (sbi->s_group_desc == NULL) {
1109 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1112 bgl_lock_init(sbi->s_blockgroup_lock);
1113 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1114 if (!sbi->s_debts) {
1115 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1116 goto failed_mount_group_desc;
1118 for (i = 0; i < db_count; i++) {
1119 block = descriptor_loc(sb, logic_sb_block, i);
1120 sbi->s_group_desc[i] = sb_bread(sb, block);
1121 if (!sbi->s_group_desc[i]) {
1122 for (j = 0; j < i; j++)
1123 brelse (sbi->s_group_desc[j]);
1124 ext2_msg(sb, KERN_ERR,
1125 "error: unable to read group descriptors");
1126 goto failed_mount_group_desc;
1129 if (!ext2_check_descriptors (sb)) {
1130 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1133 sbi->s_gdb_count = db_count;
1134 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1135 spin_lock_init(&sbi->s_next_gen_lock);
1137 /* per fileystem reservation list head & lock */
1138 spin_lock_init(&sbi->s_rsv_window_lock);
1139 sbi->s_rsv_window_root = RB_ROOT;
1141 * Add a single, static dummy reservation to the start of the
1142 * reservation window list --- it gives us a placeholder for
1143 * append-at-start-of-list which makes the allocation logic
1146 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1147 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1148 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1149 sbi->s_rsv_window_head.rsv_goal_size = 0;
1150 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1152 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1153 ext2_count_free_blocks(sb), GFP_KERNEL);
1155 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1156 ext2_count_free_inodes(sb), GFP_KERNEL);
1159 err = percpu_counter_init(&sbi->s_dirs_counter,
1160 ext2_count_dirs(sb), GFP_KERNEL);
1163 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1167 #ifdef CONFIG_EXT2_FS_XATTR
1168 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1169 if (!sbi->s_ea_block_cache) {
1170 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1175 * set up enough so that it can read an inode
1177 sb->s_op = &ext2_sops;
1178 sb->s_export_op = &ext2_export_ops;
1179 sb->s_xattr = ext2_xattr_handlers;
1182 sb->dq_op = &dquot_operations;
1183 sb->s_qcop = &ext2_quotactl_ops;
1184 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1187 root = ext2_iget(sb, EXT2_ROOT_INO);
1189 ret = PTR_ERR(root);
1192 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1194 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1198 sb->s_root = d_make_root(root);
1200 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1204 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1205 ext2_msg(sb, KERN_WARNING,
1206 "warning: mounting ext3 filesystem as ext2");
1207 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1208 sb->s_flags |= SB_RDONLY;
1209 ext2_write_super(sb);
1214 ext2_msg(sb, KERN_ERR,
1215 "error: can't find an ext2 filesystem on dev %s.",
1219 if (sbi->s_ea_block_cache)
1220 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1221 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1222 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1223 percpu_counter_destroy(&sbi->s_dirs_counter);
1225 for (i = 0; i < db_count; i++)
1226 brelse(sbi->s_group_desc[i]);
1227 failed_mount_group_desc:
1228 kfree(sbi->s_group_desc);
1229 kfree(sbi->s_debts);
1233 sb->s_fs_info = NULL;
1234 kfree(sbi->s_blockgroup_lock);
1237 fs_put_dax(dax_dev);
1241 static void ext2_clear_super_error(struct super_block *sb)
1243 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1245 if (buffer_write_io_error(sbh)) {
1247 * Oh, dear. A previous attempt to write the
1248 * superblock failed. This could happen because the
1249 * USB device was yanked out. Or it could happen to
1250 * be a transient write error and maybe the block will
1251 * be remapped. Nothing we can do but to retry the
1252 * write and hope for the best.
1254 ext2_msg(sb, KERN_ERR,
1255 "previous I/O error to superblock detected");
1256 clear_buffer_write_io_error(sbh);
1257 set_buffer_uptodate(sbh);
1261 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1264 ext2_clear_super_error(sb);
1265 spin_lock(&EXT2_SB(sb)->s_lock);
1266 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1267 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1268 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1269 /* unlock before we do IO */
1270 spin_unlock(&EXT2_SB(sb)->s_lock);
1271 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1273 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1277 * In the second extended file system, it is not necessary to
1278 * write the super block since we use a mapping of the
1279 * disk super block in a buffer.
1281 * However, this function is still used to set the fs valid
1282 * flags to 0. We need to set this flag to 0 since the fs
1283 * may have been checked while mounted and e2fsck may have
1284 * set s_state to EXT2_VALID_FS after some corrections.
1286 static int ext2_sync_fs(struct super_block *sb, int wait)
1288 struct ext2_sb_info *sbi = EXT2_SB(sb);
1289 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1292 * Write quota structures to quota file, sync_blockdev() will write
1293 * them to disk later
1295 dquot_writeback_dquots(sb, -1);
1297 spin_lock(&sbi->s_lock);
1298 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1299 ext2_debug("setting valid to 0\n");
1300 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1302 spin_unlock(&sbi->s_lock);
1303 ext2_sync_super(sb, es, wait);
1307 static int ext2_freeze(struct super_block *sb)
1309 struct ext2_sb_info *sbi = EXT2_SB(sb);
1312 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1313 * because we have unattached inodes and thus filesystem is not fully
1316 if (atomic_long_read(&sb->s_remove_count)) {
1317 ext2_sync_fs(sb, 1);
1320 /* Set EXT2_FS_VALID flag */
1321 spin_lock(&sbi->s_lock);
1322 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1323 spin_unlock(&sbi->s_lock);
1324 ext2_sync_super(sb, sbi->s_es, 1);
1329 static int ext2_unfreeze(struct super_block *sb)
1331 /* Just write sb to clear EXT2_VALID_FS flag */
1332 ext2_write_super(sb);
1337 static void ext2_write_super(struct super_block *sb)
1340 ext2_sync_fs(sb, 1);
1343 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1345 struct ext2_sb_info * sbi = EXT2_SB(sb);
1346 struct ext2_super_block * es;
1347 struct ext2_mount_options new_opts;
1350 sync_filesystem(sb);
1352 spin_lock(&sbi->s_lock);
1353 new_opts.s_mount_opt = sbi->s_mount_opt;
1354 new_opts.s_resuid = sbi->s_resuid;
1355 new_opts.s_resgid = sbi->s_resgid;
1356 spin_unlock(&sbi->s_lock);
1358 if (!parse_options(data, sb, &new_opts))
1361 spin_lock(&sbi->s_lock);
1363 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1364 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1365 "dax flag with busy inodes while remounting");
1366 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1368 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1370 if (*flags & SB_RDONLY) {
1371 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1372 !(sbi->s_mount_state & EXT2_VALID_FS))
1376 * OK, we are remounting a valid rw partition rdonly, so set
1377 * the rdonly flag and then mark the partition as valid again.
1379 es->s_state = cpu_to_le16(sbi->s_mount_state);
1380 es->s_mtime = cpu_to_le32(ktime_get_real_seconds());
1381 spin_unlock(&sbi->s_lock);
1383 err = dquot_suspend(sb, -1);
1387 ext2_sync_super(sb, es, 1);
1389 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1390 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1392 spin_unlock(&sbi->s_lock);
1393 ext2_msg(sb, KERN_WARNING,
1394 "warning: couldn't remount RDWR because of "
1395 "unsupported optional features (%x).",
1400 * Mounting a RDONLY partition read-write, so reread and
1401 * store the current valid flag. (It may have been changed
1402 * by e2fsck since we originally mounted the partition.)
1404 sbi->s_mount_state = le16_to_cpu(es->s_state);
1405 if (!ext2_setup_super (sb, es, 0))
1406 sb->s_flags &= ~SB_RDONLY;
1407 spin_unlock(&sbi->s_lock);
1409 ext2_write_super(sb);
1411 dquot_resume(sb, -1);
1414 spin_lock(&sbi->s_lock);
1416 sbi->s_mount_opt = new_opts.s_mount_opt;
1417 sbi->s_resuid = new_opts.s_resuid;
1418 sbi->s_resgid = new_opts.s_resgid;
1419 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1420 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1421 spin_unlock(&sbi->s_lock);
1426 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1428 struct super_block *sb = dentry->d_sb;
1429 struct ext2_sb_info *sbi = EXT2_SB(sb);
1430 struct ext2_super_block *es = sbi->s_es;
1433 spin_lock(&sbi->s_lock);
1435 if (test_opt (sb, MINIX_DF))
1436 sbi->s_overhead_last = 0;
1437 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1438 unsigned long i, overhead = 0;
1442 * Compute the overhead (FS structures). This is constant
1443 * for a given filesystem unless the number of block groups
1444 * changes so we cache the previous value until it does.
1448 * All of the blocks before first_data_block are
1451 overhead = le32_to_cpu(es->s_first_data_block);
1454 * Add the overhead attributed to the superblock and
1455 * block group descriptors. If the sparse superblocks
1456 * feature is turned on, then not all groups have this.
1458 for (i = 0; i < sbi->s_groups_count; i++)
1459 overhead += ext2_bg_has_super(sb, i) +
1460 ext2_bg_num_gdb(sb, i);
1463 * Every block group has an inode bitmap, a block
1464 * bitmap, and an inode table.
1466 overhead += (sbi->s_groups_count *
1467 (2 + sbi->s_itb_per_group));
1468 sbi->s_overhead_last = overhead;
1470 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1473 buf->f_type = EXT2_SUPER_MAGIC;
1474 buf->f_bsize = sb->s_blocksize;
1475 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1476 buf->f_bfree = ext2_count_free_blocks(sb);
1477 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1478 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1479 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1481 buf->f_files = le32_to_cpu(es->s_inodes_count);
1482 buf->f_ffree = ext2_count_free_inodes(sb);
1483 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1484 buf->f_namelen = EXT2_NAME_LEN;
1485 fsid = le64_to_cpup((void *)es->s_uuid) ^
1486 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1487 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1488 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1489 spin_unlock(&sbi->s_lock);
1493 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1494 int flags, const char *dev_name, void *data)
1496 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1501 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1502 * acquiring the locks... As quota files are never truncated and quota code
1503 * itself serializes the operations (and no one else should touch the files)
1504 * we don't have to be afraid of races */
1505 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1506 size_t len, loff_t off)
1508 struct inode *inode = sb_dqopt(sb)->files[type];
1509 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1511 int offset = off & (sb->s_blocksize - 1);
1514 struct buffer_head tmp_bh;
1515 struct buffer_head *bh;
1516 loff_t i_size = i_size_read(inode);
1520 if (off+len > i_size)
1523 while (toread > 0) {
1524 tocopy = sb->s_blocksize - offset < toread ?
1525 sb->s_blocksize - offset : toread;
1528 tmp_bh.b_size = sb->s_blocksize;
1529 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1532 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1533 memset(data, 0, tocopy);
1535 bh = sb_bread(sb, tmp_bh.b_blocknr);
1538 memcpy(data, bh->b_data+offset, tocopy);
1549 /* Write to quotafile */
1550 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1551 const char *data, size_t len, loff_t off)
1553 struct inode *inode = sb_dqopt(sb)->files[type];
1554 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1556 int offset = off & (sb->s_blocksize - 1);
1558 size_t towrite = len;
1559 struct buffer_head tmp_bh;
1560 struct buffer_head *bh;
1562 while (towrite > 0) {
1563 tocopy = sb->s_blocksize - offset < towrite ?
1564 sb->s_blocksize - offset : towrite;
1567 tmp_bh.b_size = sb->s_blocksize;
1568 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1571 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1572 bh = sb_bread(sb, tmp_bh.b_blocknr);
1574 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1575 if (unlikely(!bh)) {
1580 memcpy(bh->b_data+offset, data, tocopy);
1581 flush_dcache_page(bh->b_page);
1582 set_buffer_uptodate(bh);
1583 mark_buffer_dirty(bh);
1594 if (inode->i_size < off+len-towrite)
1595 i_size_write(inode, off+len-towrite);
1596 inode_inc_iversion(inode);
1597 inode->i_mtime = inode->i_ctime = current_time(inode);
1598 mark_inode_dirty(inode);
1599 return len - towrite;
1602 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1603 const struct path *path)
1606 struct inode *inode;
1608 err = dquot_quota_on(sb, type, format_id, path);
1612 inode = d_inode(path->dentry);
1614 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1615 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1616 S_NOATIME | S_IMMUTABLE);
1617 inode_unlock(inode);
1618 mark_inode_dirty(inode);
1623 static int ext2_quota_off(struct super_block *sb, int type)
1625 struct inode *inode = sb_dqopt(sb)->files[type];
1628 if (!inode || !igrab(inode))
1631 err = dquot_quota_off(sb, type);
1636 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1637 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1638 inode_unlock(inode);
1639 mark_inode_dirty(inode);
1644 return dquot_quota_off(sb, type);
1649 static struct file_system_type ext2_fs_type = {
1650 .owner = THIS_MODULE,
1652 .mount = ext2_mount,
1653 .kill_sb = kill_block_super,
1654 .fs_flags = FS_REQUIRES_DEV,
1656 MODULE_ALIAS_FS("ext2");
1658 static int __init init_ext2_fs(void)
1662 err = init_inodecache();
1665 err = register_filesystem(&ext2_fs_type);
1670 destroy_inodecache();
1674 static void __exit exit_ext2_fs(void)
1676 unregister_filesystem(&ext2_fs_type);
1677 destroy_inodecache();
1680 MODULE_AUTHOR("Remy Card and others");
1681 MODULE_DESCRIPTION("Second Extended Filesystem");
1682 MODULE_LICENSE("GPL");
1683 module_init(init_ext2_fs)
1684 module_exit(exit_ext2_fs)