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>
40 static void ext2_write_super(struct super_block *sb);
41 static int ext2_remount (struct super_block * sb, int * flags, char * data);
42 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
43 static int ext2_sync_fs(struct super_block *sb, int wait);
44 static int ext2_freeze(struct super_block *sb);
45 static int ext2_unfreeze(struct super_block *sb);
47 void ext2_error(struct super_block *sb, const char *function,
52 struct ext2_sb_info *sbi = EXT2_SB(sb);
53 struct ext2_super_block *es = sbi->s_es;
55 if (!(sb->s_flags & MS_RDONLY)) {
56 spin_lock(&sbi->s_lock);
57 sbi->s_mount_state |= EXT2_ERROR_FS;
58 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
59 spin_unlock(&sbi->s_lock);
60 ext2_sync_super(sb, es, 1);
68 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
69 sb->s_id, function, &vaf);
73 if (test_opt(sb, ERRORS_PANIC))
74 panic("EXT2-fs: panic from previous error\n");
75 if (test_opt(sb, ERRORS_RO)) {
76 ext2_msg(sb, KERN_CRIT,
77 "error: remounting filesystem read-only");
78 sb->s_flags |= MS_RDONLY;
82 void ext2_msg(struct super_block *sb, const char *prefix,
93 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
99 * This must be called with sbi->s_lock held.
101 void ext2_update_dynamic_rev(struct super_block *sb)
103 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
105 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
108 ext2_msg(sb, KERN_WARNING,
109 "warning: updating to rev %d because of "
110 "new feature flag, running e2fsck is recommended",
113 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
114 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
115 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
116 /* leave es->s_feature_*compat flags alone */
117 /* es->s_uuid will be set by e2fsck if empty */
120 * The rest of the superblock fields should be zero, and if not it
121 * means they are likely already in use, so leave them alone. We
122 * can leave it up to e2fsck to clean up any inconsistencies there.
127 static int ext2_quota_off(struct super_block *sb, int type);
129 static void ext2_quota_off_umount(struct super_block *sb)
133 for (type = 0; type < MAXQUOTAS; type++)
134 ext2_quota_off(sb, type);
137 static inline void ext2_quota_off_umount(struct super_block *sb)
142 static void ext2_put_super (struct super_block * sb)
146 struct ext2_sb_info *sbi = EXT2_SB(sb);
148 ext2_quota_off_umount(sb);
150 if (sbi->s_ea_block_cache) {
151 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
152 sbi->s_ea_block_cache = NULL;
154 if (!(sb->s_flags & MS_RDONLY)) {
155 struct ext2_super_block *es = sbi->s_es;
157 spin_lock(&sbi->s_lock);
158 es->s_state = cpu_to_le16(sbi->s_mount_state);
159 spin_unlock(&sbi->s_lock);
160 ext2_sync_super(sb, es, 1);
162 db_count = sbi->s_gdb_count;
163 for (i = 0; i < db_count; i++)
164 if (sbi->s_group_desc[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 ei->vfs_inode.i_version = 1;
189 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
192 return &ei->vfs_inode;
195 static void ext2_i_callback(struct rcu_head *head)
197 struct inode *inode = container_of(head, struct inode, i_rcu);
198 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
201 static void ext2_destroy_inode(struct inode *inode)
203 call_rcu(&inode->i_rcu, ext2_i_callback);
206 static void init_once(void *foo)
208 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
210 rwlock_init(&ei->i_meta_lock);
211 #ifdef CONFIG_EXT2_FS_XATTR
212 init_rwsem(&ei->xattr_sem);
214 mutex_init(&ei->truncate_mutex);
216 init_rwsem(&ei->dax_sem);
218 inode_init_once(&ei->vfs_inode);
221 static int __init init_inodecache(void)
223 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
224 sizeof(struct ext2_inode_info),
225 0, (SLAB_RECLAIM_ACCOUNT|
226 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
228 if (ext2_inode_cachep == NULL)
233 static void destroy_inodecache(void)
236 * Make sure all delayed rcu free inodes are flushed before we
240 kmem_cache_destroy(ext2_inode_cachep);
243 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
245 struct super_block *sb = root->d_sb;
246 struct ext2_sb_info *sbi = EXT2_SB(sb);
247 struct ext2_super_block *es = sbi->s_es;
248 unsigned long def_mount_opts;
250 spin_lock(&sbi->s_lock);
251 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
253 if (sbi->s_sb_block != 1)
254 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
255 if (test_opt(sb, MINIX_DF))
256 seq_puts(seq, ",minixdf");
257 if (test_opt(sb, GRPID))
258 seq_puts(seq, ",grpid");
259 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
260 seq_puts(seq, ",nogrpid");
261 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
262 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
263 seq_printf(seq, ",resuid=%u",
264 from_kuid_munged(&init_user_ns, sbi->s_resuid));
266 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
267 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
268 seq_printf(seq, ",resgid=%u",
269 from_kgid_munged(&init_user_ns, sbi->s_resgid));
271 if (test_opt(sb, ERRORS_RO)) {
272 int def_errors = le16_to_cpu(es->s_errors);
274 if (def_errors == EXT2_ERRORS_PANIC ||
275 def_errors == EXT2_ERRORS_CONTINUE) {
276 seq_puts(seq, ",errors=remount-ro");
279 if (test_opt(sb, ERRORS_CONT))
280 seq_puts(seq, ",errors=continue");
281 if (test_opt(sb, ERRORS_PANIC))
282 seq_puts(seq, ",errors=panic");
283 if (test_opt(sb, NO_UID32))
284 seq_puts(seq, ",nouid32");
285 if (test_opt(sb, DEBUG))
286 seq_puts(seq, ",debug");
287 if (test_opt(sb, OLDALLOC))
288 seq_puts(seq, ",oldalloc");
290 #ifdef CONFIG_EXT2_FS_XATTR
291 if (test_opt(sb, XATTR_USER))
292 seq_puts(seq, ",user_xattr");
293 if (!test_opt(sb, XATTR_USER) &&
294 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
295 seq_puts(seq, ",nouser_xattr");
299 #ifdef CONFIG_EXT2_FS_POSIX_ACL
300 if (test_opt(sb, POSIX_ACL))
301 seq_puts(seq, ",acl");
302 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
303 seq_puts(seq, ",noacl");
306 if (test_opt(sb, NOBH))
307 seq_puts(seq, ",nobh");
309 #if defined(CONFIG_QUOTA)
310 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
311 seq_puts(seq, ",usrquota");
313 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
314 seq_puts(seq, ",grpquota");
318 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
319 seq_puts(seq, ",xip");
320 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
321 seq_puts(seq, ",dax");
324 if (!test_opt(sb, RESERVATION))
325 seq_puts(seq, ",noreservation");
327 spin_unlock(&sbi->s_lock);
332 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
333 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
334 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
335 const struct path *path);
336 static struct dquot **ext2_get_dquots(struct inode *inode)
338 return EXT2_I(inode)->i_dquot;
341 static const struct quotactl_ops ext2_quotactl_ops = {
342 .quota_on = ext2_quota_on,
343 .quota_off = ext2_quota_off,
344 .quota_sync = dquot_quota_sync,
345 .get_state = dquot_get_state,
346 .set_info = dquot_set_dqinfo,
347 .get_dqblk = dquot_get_dqblk,
348 .set_dqblk = dquot_set_dqblk,
349 .get_nextdqblk = dquot_get_next_dqblk,
353 static const struct super_operations ext2_sops = {
354 .alloc_inode = ext2_alloc_inode,
355 .destroy_inode = ext2_destroy_inode,
356 .write_inode = ext2_write_inode,
357 .evict_inode = ext2_evict_inode,
358 .put_super = ext2_put_super,
359 .sync_fs = ext2_sync_fs,
360 .freeze_fs = ext2_freeze,
361 .unfreeze_fs = ext2_unfreeze,
362 .statfs = ext2_statfs,
363 .remount_fs = ext2_remount,
364 .show_options = ext2_show_options,
366 .quota_read = ext2_quota_read,
367 .quota_write = ext2_quota_write,
368 .get_dquots = ext2_get_dquots,
372 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
373 u64 ino, u32 generation)
377 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
378 return ERR_PTR(-ESTALE);
379 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
380 return ERR_PTR(-ESTALE);
383 * ext2_iget isn't quite right if the inode is currently unallocated!
384 * However ext2_iget currently does appropriate checks to handle stale
385 * inodes so everything is OK.
387 inode = ext2_iget(sb, ino);
389 return ERR_CAST(inode);
390 if (generation && inode->i_generation != generation) {
391 /* we didn't find the right inode.. */
393 return ERR_PTR(-ESTALE);
398 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
399 int fh_len, int fh_type)
401 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
405 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
406 int fh_len, int fh_type)
408 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
412 static const struct export_operations ext2_export_ops = {
413 .fh_to_dentry = ext2_fh_to_dentry,
414 .fh_to_parent = ext2_fh_to_parent,
415 .get_parent = ext2_get_parent,
418 static unsigned long get_sb_block(void **data)
420 unsigned long sb_block;
421 char *options = (char *) *data;
423 if (!options || strncmp(options, "sb=", 3) != 0)
424 return 1; /* Default location */
426 sb_block = simple_strtoul(options, &options, 0);
427 if (*options && *options != ',') {
428 printk("EXT2-fs: Invalid sb specification: %s\n",
434 *data = (void *) options;
439 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
440 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
441 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
442 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
443 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
444 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
447 static const match_table_t tokens = {
448 {Opt_bsd_df, "bsddf"},
449 {Opt_minix_df, "minixdf"},
450 {Opt_grpid, "grpid"},
451 {Opt_grpid, "bsdgroups"},
452 {Opt_nogrpid, "nogrpid"},
453 {Opt_nogrpid, "sysvgroups"},
454 {Opt_resgid, "resgid=%u"},
455 {Opt_resuid, "resuid=%u"},
457 {Opt_err_cont, "errors=continue"},
458 {Opt_err_panic, "errors=panic"},
459 {Opt_err_ro, "errors=remount-ro"},
460 {Opt_nouid32, "nouid32"},
461 {Opt_nocheck, "check=none"},
462 {Opt_nocheck, "nocheck"},
463 {Opt_debug, "debug"},
464 {Opt_oldalloc, "oldalloc"},
465 {Opt_orlov, "orlov"},
467 {Opt_user_xattr, "user_xattr"},
468 {Opt_nouser_xattr, "nouser_xattr"},
470 {Opt_noacl, "noacl"},
473 {Opt_grpquota, "grpquota"},
474 {Opt_ignore, "noquota"},
475 {Opt_quota, "quota"},
476 {Opt_usrquota, "usrquota"},
477 {Opt_reservation, "reservation"},
478 {Opt_noreservation, "noreservation"},
482 static int parse_options(char *options, struct super_block *sb)
485 struct ext2_sb_info *sbi = EXT2_SB(sb);
486 substring_t args[MAX_OPT_ARGS];
494 while ((p = strsep (&options, ",")) != NULL) {
499 token = match_token(p, tokens, args);
502 clear_opt (sbi->s_mount_opt, MINIX_DF);
505 set_opt (sbi->s_mount_opt, MINIX_DF);
508 set_opt (sbi->s_mount_opt, GRPID);
511 clear_opt (sbi->s_mount_opt, GRPID);
514 if (match_int(&args[0], &option))
516 uid = make_kuid(current_user_ns(), option);
517 if (!uid_valid(uid)) {
518 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
525 if (match_int(&args[0], &option))
527 gid = make_kgid(current_user_ns(), option);
528 if (!gid_valid(gid)) {
529 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
535 /* handled by get_sb_block() instead of here */
536 /* *sb_block = match_int(&args[0]); */
539 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
540 clear_opt (sbi->s_mount_opt, ERRORS_RO);
541 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
544 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
545 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
546 set_opt (sbi->s_mount_opt, ERRORS_RO);
549 clear_opt (sbi->s_mount_opt, ERRORS_RO);
550 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
551 set_opt (sbi->s_mount_opt, ERRORS_CONT);
554 set_opt (sbi->s_mount_opt, NO_UID32);
557 clear_opt (sbi->s_mount_opt, CHECK);
560 set_opt (sbi->s_mount_opt, DEBUG);
563 set_opt (sbi->s_mount_opt, OLDALLOC);
566 clear_opt (sbi->s_mount_opt, OLDALLOC);
569 set_opt (sbi->s_mount_opt, NOBH);
571 #ifdef CONFIG_EXT2_FS_XATTR
573 set_opt (sbi->s_mount_opt, XATTR_USER);
575 case Opt_nouser_xattr:
576 clear_opt (sbi->s_mount_opt, XATTR_USER);
580 case Opt_nouser_xattr:
581 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
585 #ifdef CONFIG_EXT2_FS_POSIX_ACL
587 set_opt(sbi->s_mount_opt, POSIX_ACL);
590 clear_opt(sbi->s_mount_opt, POSIX_ACL);
595 ext2_msg(sb, KERN_INFO,
596 "(no)acl options not supported");
600 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
601 set_opt(sbi->s_mount_opt, XIP);
605 ext2_msg(sb, KERN_WARNING,
606 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
607 set_opt(sbi->s_mount_opt, DAX);
609 ext2_msg(sb, KERN_INFO, "dax option not supported");
613 #if defined(CONFIG_QUOTA)
616 set_opt(sbi->s_mount_opt, USRQUOTA);
620 set_opt(sbi->s_mount_opt, GRPQUOTA);
626 ext2_msg(sb, KERN_INFO,
627 "quota operations not supported");
631 case Opt_reservation:
632 set_opt(sbi->s_mount_opt, RESERVATION);
633 ext2_msg(sb, KERN_INFO, "reservations ON");
635 case Opt_noreservation:
636 clear_opt(sbi->s_mount_opt, RESERVATION);
637 ext2_msg(sb, KERN_INFO, "reservations OFF");
648 static int ext2_setup_super (struct super_block * sb,
649 struct ext2_super_block * es,
653 struct ext2_sb_info *sbi = EXT2_SB(sb);
655 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
656 ext2_msg(sb, KERN_ERR,
657 "error: revision level too high, "
658 "forcing read-only mode");
663 if (!(sbi->s_mount_state & EXT2_VALID_FS))
664 ext2_msg(sb, KERN_WARNING,
665 "warning: mounting unchecked fs, "
666 "running e2fsck is recommended");
667 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
668 ext2_msg(sb, KERN_WARNING,
669 "warning: mounting fs with errors, "
670 "running e2fsck is recommended");
671 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
672 le16_to_cpu(es->s_mnt_count) >=
673 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
674 ext2_msg(sb, KERN_WARNING,
675 "warning: maximal mount count reached, "
676 "running e2fsck is recommended");
677 else if (le32_to_cpu(es->s_checkinterval) &&
678 (le32_to_cpu(es->s_lastcheck) +
679 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
680 ext2_msg(sb, KERN_WARNING,
681 "warning: checktime reached, "
682 "running e2fsck is recommended");
683 if (!le16_to_cpu(es->s_max_mnt_count))
684 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
685 le16_add_cpu(&es->s_mnt_count, 1);
686 if (test_opt (sb, DEBUG))
687 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
688 "bpg=%lu, ipg=%lu, mo=%04lx]",
689 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
692 EXT2_BLOCKS_PER_GROUP(sb),
693 EXT2_INODES_PER_GROUP(sb),
698 static int ext2_check_descriptors(struct super_block *sb)
701 struct ext2_sb_info *sbi = EXT2_SB(sb);
703 ext2_debug ("Checking group descriptors");
705 for (i = 0; i < sbi->s_groups_count; i++) {
706 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
707 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
708 ext2_fsblk_t last_block;
710 if (i == sbi->s_groups_count - 1)
711 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
713 last_block = first_block +
714 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
716 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
717 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
719 ext2_error (sb, "ext2_check_descriptors",
720 "Block bitmap for group %d"
721 " not in group (block %lu)!",
722 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
725 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
726 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
728 ext2_error (sb, "ext2_check_descriptors",
729 "Inode bitmap for group %d"
730 " not in group (block %lu)!",
731 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
734 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
735 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
738 ext2_error (sb, "ext2_check_descriptors",
739 "Inode table for group %d"
740 " not in group (block %lu)!",
741 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
749 * Maximal file size. There is a direct, and {,double-,triple-}indirect
750 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
751 * We need to be 1 filesystem block less than the 2^32 sector limit.
753 static loff_t ext2_max_size(int bits)
755 loff_t res = EXT2_NDIR_BLOCKS;
759 /* This is calculated to be the largest file size for a
760 * dense, file such that the total number of
761 * sectors in the file, including data and all indirect blocks,
762 * does not exceed 2^32 -1
763 * __u32 i_blocks representing the total number of
764 * 512 bytes blocks of the file
766 upper_limit = (1LL << 32) - 1;
768 /* total blocks in file system block size */
769 upper_limit >>= (bits - 9);
772 /* indirect blocks */
774 /* double indirect blocks */
775 meta_blocks += 1 + (1LL << (bits-2));
776 /* tripple indirect blocks */
777 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
779 upper_limit -= meta_blocks;
780 upper_limit <<= bits;
782 res += 1LL << (bits-2);
783 res += 1LL << (2*(bits-2));
784 res += 1LL << (3*(bits-2));
786 if (res > upper_limit)
789 if (res > MAX_LFS_FILESIZE)
790 res = MAX_LFS_FILESIZE;
795 static unsigned long descriptor_loc(struct super_block *sb,
796 unsigned long logic_sb_block,
799 struct ext2_sb_info *sbi = EXT2_SB(sb);
800 unsigned long bg, first_meta_bg;
803 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
805 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
807 return (logic_sb_block + nr + 1);
808 bg = sbi->s_desc_per_block * nr;
809 if (ext2_bg_has_super(sb, bg))
812 return ext2_group_first_block_no(sb, bg) + has_super;
815 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
817 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
818 struct buffer_head * bh;
819 struct ext2_sb_info * sbi;
820 struct ext2_super_block * es;
823 unsigned long sb_block = get_sb_block(&data);
824 unsigned long logic_sb_block;
825 unsigned long offset = 0;
826 unsigned long def_mount_opts;
828 int blocksize = BLOCK_SIZE;
835 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
839 sbi->s_blockgroup_lock =
840 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
841 if (!sbi->s_blockgroup_lock) {
846 sbi->s_sb_block = sb_block;
847 sbi->s_daxdev = dax_dev;
849 spin_lock_init(&sbi->s_lock);
852 * See what the current blocksize for the device is, and
853 * use that as the blocksize. Otherwise (or if the blocksize
854 * is smaller than the default) use the default.
855 * This is important for devices that have a hardware
856 * sectorsize that is larger than the default.
858 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
860 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
865 * If the superblock doesn't start on a hardware sector boundary,
866 * calculate the offset.
868 if (blocksize != BLOCK_SIZE) {
869 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
870 offset = (sb_block*BLOCK_SIZE) % blocksize;
872 logic_sb_block = sb_block;
875 if (!(bh = sb_bread(sb, logic_sb_block))) {
876 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
880 * Note: s_es must be initialized as soon as possible because
881 * some ext2 macro-instructions depend on its value
883 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
885 sb->s_magic = le16_to_cpu(es->s_magic);
887 if (sb->s_magic != EXT2_SUPER_MAGIC)
890 /* Set defaults before we parse the mount options */
891 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
892 if (def_mount_opts & EXT2_DEFM_DEBUG)
893 set_opt(sbi->s_mount_opt, DEBUG);
894 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
895 set_opt(sbi->s_mount_opt, GRPID);
896 if (def_mount_opts & EXT2_DEFM_UID16)
897 set_opt(sbi->s_mount_opt, NO_UID32);
898 #ifdef CONFIG_EXT2_FS_XATTR
899 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
900 set_opt(sbi->s_mount_opt, XATTR_USER);
902 #ifdef CONFIG_EXT2_FS_POSIX_ACL
903 if (def_mount_opts & EXT2_DEFM_ACL)
904 set_opt(sbi->s_mount_opt, POSIX_ACL);
907 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
908 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
909 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
910 set_opt(sbi->s_mount_opt, ERRORS_CONT);
912 set_opt(sbi->s_mount_opt, ERRORS_RO);
914 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
915 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
917 set_opt(sbi->s_mount_opt, RESERVATION);
919 if (!parse_options((char *) data, sb))
922 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
923 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
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->s_flags & MS_RDONLY) &&
947 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
948 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
949 "unsupported optional features (%x)",
950 le32_to_cpu(features));
954 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
956 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
957 err = bdev_dax_supported(sb, blocksize);
962 /* If the blocksize doesn't match, re-read the thing.. */
963 if (sb->s_blocksize != blocksize) {
966 if (!sb_set_blocksize(sb, blocksize)) {
967 ext2_msg(sb, KERN_ERR,
968 "error: bad blocksize %d", blocksize);
972 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
973 offset = (sb_block*BLOCK_SIZE) % blocksize;
974 bh = sb_bread(sb, logic_sb_block);
976 ext2_msg(sb, KERN_ERR, "error: couldn't read"
977 "superblock on 2nd try");
980 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
982 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
983 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
988 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
989 sb->s_max_links = EXT2_LINK_MAX;
991 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
992 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
993 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
995 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
996 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
997 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
998 !is_power_of_2(sbi->s_inode_size) ||
999 (sbi->s_inode_size > blocksize)) {
1000 ext2_msg(sb, KERN_ERR,
1001 "error: unsupported inode size: %d",
1007 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1008 le32_to_cpu(es->s_log_frag_size);
1009 if (sbi->s_frag_size == 0)
1011 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1013 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1014 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1015 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1017 if (EXT2_INODE_SIZE(sb) == 0)
1019 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1020 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1022 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1023 sbi->s_inodes_per_block;
1024 sbi->s_desc_per_block = sb->s_blocksize /
1025 sizeof (struct ext2_group_desc);
1027 sbi->s_mount_state = le16_to_cpu(es->s_state);
1028 sbi->s_addr_per_block_bits =
1029 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1030 sbi->s_desc_per_block_bits =
1031 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1033 if (sb->s_magic != EXT2_SUPER_MAGIC)
1036 if (sb->s_blocksize != bh->b_size) {
1038 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1042 if (sb->s_blocksize != sbi->s_frag_size) {
1043 ext2_msg(sb, KERN_ERR,
1044 "error: fragsize %lu != blocksize %lu"
1045 "(not supported yet)",
1046 sbi->s_frag_size, sb->s_blocksize);
1050 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1051 ext2_msg(sb, KERN_ERR,
1052 "error: #blocks per group too big: %lu",
1053 sbi->s_blocks_per_group);
1056 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1057 ext2_msg(sb, KERN_ERR,
1058 "error: #fragments per group too big: %lu",
1059 sbi->s_frags_per_group);
1062 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1063 ext2_msg(sb, KERN_ERR,
1064 "error: #inodes per group too big: %lu",
1065 sbi->s_inodes_per_group);
1069 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1071 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1072 le32_to_cpu(es->s_first_data_block) - 1)
1073 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1074 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1075 EXT2_DESC_PER_BLOCK(sb);
1076 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
1077 if (sbi->s_group_desc == NULL) {
1078 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1081 bgl_lock_init(sbi->s_blockgroup_lock);
1082 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1083 if (!sbi->s_debts) {
1084 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1085 goto failed_mount_group_desc;
1087 for (i = 0; i < db_count; i++) {
1088 block = descriptor_loc(sb, logic_sb_block, i);
1089 sbi->s_group_desc[i] = sb_bread(sb, block);
1090 if (!sbi->s_group_desc[i]) {
1091 for (j = 0; j < i; j++)
1092 brelse (sbi->s_group_desc[j]);
1093 ext2_msg(sb, KERN_ERR,
1094 "error: unable to read group descriptors");
1095 goto failed_mount_group_desc;
1098 if (!ext2_check_descriptors (sb)) {
1099 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1102 sbi->s_gdb_count = db_count;
1103 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1104 spin_lock_init(&sbi->s_next_gen_lock);
1106 /* per fileystem reservation list head & lock */
1107 spin_lock_init(&sbi->s_rsv_window_lock);
1108 sbi->s_rsv_window_root = RB_ROOT;
1110 * Add a single, static dummy reservation to the start of the
1111 * reservation window list --- it gives us a placeholder for
1112 * append-at-start-of-list which makes the allocation logic
1115 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1116 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1117 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1118 sbi->s_rsv_window_head.rsv_goal_size = 0;
1119 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1121 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1122 ext2_count_free_blocks(sb), GFP_KERNEL);
1124 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1125 ext2_count_free_inodes(sb), GFP_KERNEL);
1128 err = percpu_counter_init(&sbi->s_dirs_counter,
1129 ext2_count_dirs(sb), GFP_KERNEL);
1132 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1136 #ifdef CONFIG_EXT2_FS_XATTR
1137 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1138 if (!sbi->s_ea_block_cache) {
1139 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1144 * set up enough so that it can read an inode
1146 sb->s_op = &ext2_sops;
1147 sb->s_export_op = &ext2_export_ops;
1148 sb->s_xattr = ext2_xattr_handlers;
1151 sb->dq_op = &dquot_operations;
1152 sb->s_qcop = &ext2_quotactl_ops;
1153 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1156 root = ext2_iget(sb, EXT2_ROOT_INO);
1158 ret = PTR_ERR(root);
1161 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1163 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1167 sb->s_root = d_make_root(root);
1169 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1173 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1174 ext2_msg(sb, KERN_WARNING,
1175 "warning: mounting ext3 filesystem as ext2");
1176 if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
1177 sb->s_flags |= MS_RDONLY;
1178 ext2_write_super(sb);
1183 ext2_msg(sb, KERN_ERR,
1184 "error: can't find an ext2 filesystem on dev %s.",
1188 if (sbi->s_ea_block_cache)
1189 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1190 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1191 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1192 percpu_counter_destroy(&sbi->s_dirs_counter);
1194 for (i = 0; i < db_count; i++)
1195 brelse(sbi->s_group_desc[i]);
1196 failed_mount_group_desc:
1197 kfree(sbi->s_group_desc);
1198 kfree(sbi->s_debts);
1202 sb->s_fs_info = NULL;
1203 kfree(sbi->s_blockgroup_lock);
1206 fs_put_dax(dax_dev);
1210 static void ext2_clear_super_error(struct super_block *sb)
1212 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1214 if (buffer_write_io_error(sbh)) {
1216 * Oh, dear. A previous attempt to write the
1217 * superblock failed. This could happen because the
1218 * USB device was yanked out. Or it could happen to
1219 * be a transient write error and maybe the block will
1220 * be remapped. Nothing we can do but to retry the
1221 * write and hope for the best.
1223 ext2_msg(sb, KERN_ERR,
1224 "previous I/O error to superblock detected\n");
1225 clear_buffer_write_io_error(sbh);
1226 set_buffer_uptodate(sbh);
1230 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1233 ext2_clear_super_error(sb);
1234 spin_lock(&EXT2_SB(sb)->s_lock);
1235 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1236 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1237 es->s_wtime = cpu_to_le32(get_seconds());
1238 /* unlock before we do IO */
1239 spin_unlock(&EXT2_SB(sb)->s_lock);
1240 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1242 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1246 * In the second extended file system, it is not necessary to
1247 * write the super block since we use a mapping of the
1248 * disk super block in a buffer.
1250 * However, this function is still used to set the fs valid
1251 * flags to 0. We need to set this flag to 0 since the fs
1252 * may have been checked while mounted and e2fsck may have
1253 * set s_state to EXT2_VALID_FS after some corrections.
1255 static int ext2_sync_fs(struct super_block *sb, int wait)
1257 struct ext2_sb_info *sbi = EXT2_SB(sb);
1258 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1261 * Write quota structures to quota file, sync_blockdev() will write
1262 * them to disk later
1264 dquot_writeback_dquots(sb, -1);
1266 spin_lock(&sbi->s_lock);
1267 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1268 ext2_debug("setting valid to 0\n");
1269 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1271 spin_unlock(&sbi->s_lock);
1272 ext2_sync_super(sb, es, wait);
1276 static int ext2_freeze(struct super_block *sb)
1278 struct ext2_sb_info *sbi = EXT2_SB(sb);
1281 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1282 * because we have unattached inodes and thus filesystem is not fully
1285 if (atomic_long_read(&sb->s_remove_count)) {
1286 ext2_sync_fs(sb, 1);
1289 /* Set EXT2_FS_VALID flag */
1290 spin_lock(&sbi->s_lock);
1291 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1292 spin_unlock(&sbi->s_lock);
1293 ext2_sync_super(sb, sbi->s_es, 1);
1298 static int ext2_unfreeze(struct super_block *sb)
1300 /* Just write sb to clear EXT2_VALID_FS flag */
1301 ext2_write_super(sb);
1306 static void ext2_write_super(struct super_block *sb)
1308 if (!(sb->s_flags & MS_RDONLY))
1309 ext2_sync_fs(sb, 1);
1312 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1314 struct ext2_sb_info * sbi = EXT2_SB(sb);
1315 struct ext2_super_block * es;
1316 struct ext2_mount_options old_opts;
1317 unsigned long old_sb_flags;
1320 sync_filesystem(sb);
1321 spin_lock(&sbi->s_lock);
1323 /* Store the old options */
1324 old_sb_flags = sb->s_flags;
1325 old_opts.s_mount_opt = sbi->s_mount_opt;
1326 old_opts.s_resuid = sbi->s_resuid;
1327 old_opts.s_resgid = sbi->s_resgid;
1330 * Allow the "check" option to be passed as a remount option.
1332 if (!parse_options(data, sb)) {
1337 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1338 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1341 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1342 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1343 "dax flag with busy inodes while remounting");
1344 sbi->s_mount_opt ^= EXT2_MOUNT_DAX;
1346 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
1347 spin_unlock(&sbi->s_lock);
1350 if (*flags & MS_RDONLY) {
1351 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1352 !(sbi->s_mount_state & EXT2_VALID_FS)) {
1353 spin_unlock(&sbi->s_lock);
1358 * OK, we are remounting a valid rw partition rdonly, so set
1359 * the rdonly flag and then mark the partition as valid again.
1361 es->s_state = cpu_to_le16(sbi->s_mount_state);
1362 es->s_mtime = cpu_to_le32(get_seconds());
1363 spin_unlock(&sbi->s_lock);
1365 err = dquot_suspend(sb, -1);
1367 spin_lock(&sbi->s_lock);
1371 ext2_sync_super(sb, es, 1);
1373 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1374 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1376 ext2_msg(sb, KERN_WARNING,
1377 "warning: couldn't remount RDWR because of "
1378 "unsupported optional features (%x).",
1384 * Mounting a RDONLY partition read-write, so reread and
1385 * store the current valid flag. (It may have been changed
1386 * by e2fsck since we originally mounted the partition.)
1388 sbi->s_mount_state = le16_to_cpu(es->s_state);
1389 if (!ext2_setup_super (sb, es, 0))
1390 sb->s_flags &= ~MS_RDONLY;
1391 spin_unlock(&sbi->s_lock);
1393 ext2_write_super(sb);
1395 dquot_resume(sb, -1);
1400 sbi->s_mount_opt = old_opts.s_mount_opt;
1401 sbi->s_resuid = old_opts.s_resuid;
1402 sbi->s_resgid = old_opts.s_resgid;
1403 sb->s_flags = old_sb_flags;
1404 spin_unlock(&sbi->s_lock);
1408 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1410 struct super_block *sb = dentry->d_sb;
1411 struct ext2_sb_info *sbi = EXT2_SB(sb);
1412 struct ext2_super_block *es = sbi->s_es;
1415 spin_lock(&sbi->s_lock);
1417 if (test_opt (sb, MINIX_DF))
1418 sbi->s_overhead_last = 0;
1419 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1420 unsigned long i, overhead = 0;
1424 * Compute the overhead (FS structures). This is constant
1425 * for a given filesystem unless the number of block groups
1426 * changes so we cache the previous value until it does.
1430 * All of the blocks before first_data_block are
1433 overhead = le32_to_cpu(es->s_first_data_block);
1436 * Add the overhead attributed to the superblock and
1437 * block group descriptors. If the sparse superblocks
1438 * feature is turned on, then not all groups have this.
1440 for (i = 0; i < sbi->s_groups_count; i++)
1441 overhead += ext2_bg_has_super(sb, i) +
1442 ext2_bg_num_gdb(sb, i);
1445 * Every block group has an inode bitmap, a block
1446 * bitmap, and an inode table.
1448 overhead += (sbi->s_groups_count *
1449 (2 + sbi->s_itb_per_group));
1450 sbi->s_overhead_last = overhead;
1452 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1455 buf->f_type = EXT2_SUPER_MAGIC;
1456 buf->f_bsize = sb->s_blocksize;
1457 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1458 buf->f_bfree = ext2_count_free_blocks(sb);
1459 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1460 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1461 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1463 buf->f_files = le32_to_cpu(es->s_inodes_count);
1464 buf->f_ffree = ext2_count_free_inodes(sb);
1465 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1466 buf->f_namelen = EXT2_NAME_LEN;
1467 fsid = le64_to_cpup((void *)es->s_uuid) ^
1468 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1469 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1470 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
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);
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)