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/smp_lock.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <asm/uaccess.h>
38 static void ext2_sync_super(struct super_block *sb,
39 struct ext2_super_block *es);
40 static int ext2_remount (struct super_block * sb, int * flags, char * data);
41 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
43 void ext2_error (struct super_block * sb, const char * function,
44 const char * fmt, ...)
47 struct ext2_sb_info *sbi = EXT2_SB(sb);
48 struct ext2_super_block *es = sbi->s_es;
50 if (!(sb->s_flags & MS_RDONLY)) {
51 sbi->s_mount_state |= EXT2_ERROR_FS;
53 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS);
54 ext2_sync_super(sb, es);
58 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function);
63 if (test_opt(sb, ERRORS_PANIC))
64 panic("EXT2-fs panic from previous error\n");
65 if (test_opt(sb, ERRORS_RO)) {
66 printk("Remounting filesystem read-only\n");
67 sb->s_flags |= MS_RDONLY;
71 void ext2_warning (struct super_block * sb, const char * function,
72 const char * fmt, ...)
77 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ",
84 void ext2_update_dynamic_rev(struct super_block *sb)
86 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
88 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
91 ext2_warning(sb, __FUNCTION__,
92 "updating to rev %d because of new feature flag, "
93 "running e2fsck is recommended",
96 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
97 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
98 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
99 /* leave es->s_feature_*compat flags alone */
100 /* es->s_uuid will be set by e2fsck if empty */
103 * The rest of the superblock fields should be zero, and if not it
104 * means they are likely already in use, so leave them alone. We
105 * can leave it up to e2fsck to clean up any inconsistencies there.
109 static void ext2_put_super (struct super_block * sb)
113 struct ext2_sb_info *sbi = EXT2_SB(sb);
115 ext2_xattr_put_super(sb);
116 if (!(sb->s_flags & MS_RDONLY)) {
117 struct ext2_super_block *es = sbi->s_es;
119 es->s_state = cpu_to_le16(sbi->s_mount_state);
120 ext2_sync_super(sb, es);
122 db_count = sbi->s_gdb_count;
123 for (i = 0; i < db_count; i++)
124 if (sbi->s_group_desc[i])
125 brelse (sbi->s_group_desc[i]);
126 kfree(sbi->s_group_desc);
128 percpu_counter_destroy(&sbi->s_freeblocks_counter);
129 percpu_counter_destroy(&sbi->s_freeinodes_counter);
130 percpu_counter_destroy(&sbi->s_dirs_counter);
132 sb->s_fs_info = NULL;
138 static kmem_cache_t * ext2_inode_cachep;
140 static struct inode *ext2_alloc_inode(struct super_block *sb)
142 struct ext2_inode_info *ei;
143 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL);
146 #ifdef CONFIG_EXT2_FS_POSIX_ACL
147 ei->i_acl = EXT2_ACL_NOT_CACHED;
148 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
150 ei->vfs_inode.i_version = 1;
151 return &ei->vfs_inode;
154 static void ext2_destroy_inode(struct inode *inode)
156 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
159 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
161 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
163 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
164 SLAB_CTOR_CONSTRUCTOR) {
165 rwlock_init(&ei->i_meta_lock);
166 #ifdef CONFIG_EXT2_FS_XATTR
167 init_rwsem(&ei->xattr_sem);
169 inode_init_once(&ei->vfs_inode);
173 static int init_inodecache(void)
175 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
176 sizeof(struct ext2_inode_info),
177 0, (SLAB_RECLAIM_ACCOUNT|
180 if (ext2_inode_cachep == NULL)
185 static void destroy_inodecache(void)
187 if (kmem_cache_destroy(ext2_inode_cachep))
188 printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n");
191 static void ext2_clear_inode(struct inode *inode)
193 #ifdef CONFIG_EXT2_FS_POSIX_ACL
194 struct ext2_inode_info *ei = EXT2_I(inode);
196 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
197 posix_acl_release(ei->i_acl);
198 ei->i_acl = EXT2_ACL_NOT_CACHED;
200 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
201 posix_acl_release(ei->i_default_acl);
202 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
207 static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
209 struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb);
211 if (sbi->s_mount_opt & EXT2_MOUNT_GRPID)
212 seq_puts(seq, ",grpid");
214 #if defined(CONFIG_QUOTA)
215 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
216 seq_puts(seq, ",usrquota");
218 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
219 seq_puts(seq, ",grpquota");
222 #if defined(CONFIG_EXT2_FS_XIP)
223 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
224 seq_puts(seq, ",xip");
231 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
232 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
235 static struct super_operations ext2_sops = {
236 .alloc_inode = ext2_alloc_inode,
237 .destroy_inode = ext2_destroy_inode,
238 .read_inode = ext2_read_inode,
239 .write_inode = ext2_write_inode,
240 .put_inode = ext2_put_inode,
241 .delete_inode = ext2_delete_inode,
242 .put_super = ext2_put_super,
243 .write_super = ext2_write_super,
244 .statfs = ext2_statfs,
245 .remount_fs = ext2_remount,
246 .clear_inode = ext2_clear_inode,
247 .show_options = ext2_show_options,
249 .quota_read = ext2_quota_read,
250 .quota_write = ext2_quota_write,
254 static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
257 unsigned long ino = objp[0];
258 __u32 generation = objp[1];
260 struct dentry *result;
262 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
263 return ERR_PTR(-ESTALE);
264 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
265 return ERR_PTR(-ESTALE);
267 /* iget isn't really right if the inode is currently unallocated!!
268 * ext2_read_inode currently does appropriate checks, but
269 * it might be "neater" to call ext2_get_inode first and check
270 * if the inode is valid.....
272 inode = iget(sb, ino);
274 return ERR_PTR(-ENOMEM);
275 if (is_bad_inode(inode) ||
276 (generation && inode->i_generation != generation)) {
277 /* we didn't find the right inode.. */
279 return ERR_PTR(-ESTALE);
281 /* now to find a dentry.
282 * If possible, get a well-connected one
284 result = d_alloc_anon(inode);
287 return ERR_PTR(-ENOMEM);
292 /* Yes, most of these are left as NULL!!
293 * A NULL value implies the default, which works with ext2-like file
294 * systems, but can be improved upon.
295 * Currently only get_parent is required.
297 static struct export_operations ext2_export_ops = {
298 .get_parent = ext2_get_parent,
299 .get_dentry = ext2_get_dentry,
302 static unsigned long get_sb_block(void **data)
304 unsigned long sb_block;
305 char *options = (char *) *data;
307 if (!options || strncmp(options, "sb=", 3) != 0)
308 return 1; /* Default location */
310 sb_block = simple_strtoul(options, &options, 0);
311 if (*options && *options != ',') {
312 printk("EXT2-fs: Invalid sb specification: %s\n",
318 *data = (void *) options;
323 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
324 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
325 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
326 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
327 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
328 Opt_usrquota, Opt_grpquota, Opt_tagxid
331 static match_table_t tokens = {
332 {Opt_bsd_df, "bsddf"},
333 {Opt_minix_df, "minixdf"},
334 {Opt_grpid, "grpid"},
335 {Opt_grpid, "bsdgroups"},
336 {Opt_nogrpid, "nogrpid"},
337 {Opt_nogrpid, "sysvgroups"},
338 {Opt_resgid, "resgid=%u"},
339 {Opt_resuid, "resuid=%u"},
341 {Opt_err_cont, "errors=continue"},
342 {Opt_err_panic, "errors=panic"},
343 {Opt_err_ro, "errors=remount-ro"},
344 {Opt_nouid32, "nouid32"},
345 {Opt_nocheck, "check=none"},
346 {Opt_nocheck, "nocheck"},
347 {Opt_debug, "debug"},
348 {Opt_oldalloc, "oldalloc"},
349 {Opt_orlov, "orlov"},
351 {Opt_user_xattr, "user_xattr"},
352 {Opt_nouser_xattr, "nouser_xattr"},
354 {Opt_noacl, "noacl"},
356 {Opt_tagxid, "tagxid"},
357 {Opt_grpquota, "grpquota"},
358 {Opt_ignore, "noquota"},
359 {Opt_quota, "quota"},
360 {Opt_usrquota, "usrquota"},
364 static int parse_options (char * options,
365 struct ext2_sb_info *sbi)
368 substring_t args[MAX_OPT_ARGS];
369 unsigned long kind = EXT2_MOUNT_ERRORS_CONT;
375 while ((p = strsep (&options, ",")) != NULL) {
380 token = match_token(p, tokens, args);
383 clear_opt (sbi->s_mount_opt, MINIX_DF);
386 set_opt (sbi->s_mount_opt, MINIX_DF);
389 set_opt (sbi->s_mount_opt, GRPID);
392 clear_opt (sbi->s_mount_opt, GRPID);
395 if (match_int(&args[0], &option))
397 sbi->s_resuid = option;
400 if (match_int(&args[0], &option))
402 sbi->s_resgid = option;
405 /* handled by get_sb_block() instead of here */
406 /* *sb_block = match_int(&args[0]); */
409 kind = EXT2_MOUNT_ERRORS_PANIC;
412 kind = EXT2_MOUNT_ERRORS_RO;
415 kind = EXT2_MOUNT_ERRORS_CONT;
418 set_opt (sbi->s_mount_opt, NO_UID32);
420 #ifndef CONFIG_INOXID_NONE
422 set_opt (sbi->s_mount_opt, TAGXID);
426 clear_opt (sbi->s_mount_opt, CHECK);
429 set_opt (sbi->s_mount_opt, DEBUG);
432 set_opt (sbi->s_mount_opt, OLDALLOC);
435 clear_opt (sbi->s_mount_opt, OLDALLOC);
438 set_opt (sbi->s_mount_opt, NOBH);
440 #ifdef CONFIG_EXT2_FS_XATTR
442 set_opt (sbi->s_mount_opt, XATTR_USER);
444 case Opt_nouser_xattr:
445 clear_opt (sbi->s_mount_opt, XATTR_USER);
449 case Opt_nouser_xattr:
450 printk("EXT2 (no)user_xattr options not supported\n");
453 #ifdef CONFIG_EXT2_FS_POSIX_ACL
455 set_opt(sbi->s_mount_opt, POSIX_ACL);
458 clear_opt(sbi->s_mount_opt, POSIX_ACL);
463 printk("EXT2 (no)acl options not supported\n");
467 #ifdef CONFIG_EXT2_FS_XIP
468 set_opt (sbi->s_mount_opt, XIP);
470 printk("EXT2 xip option not supported\n");
474 #if defined(CONFIG_QUOTA)
477 set_opt(sbi->s_mount_opt, USRQUOTA);
481 set_opt(sbi->s_mount_opt, GRPQUOTA);
488 "EXT2-fs: quota operations not supported.\n");
499 sbi->s_mount_opt |= kind;
503 static int ext2_setup_super (struct super_block * sb,
504 struct ext2_super_block * es,
508 struct ext2_sb_info *sbi = EXT2_SB(sb);
510 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
511 printk ("EXT2-fs warning: revision level too high, "
512 "forcing read-only mode\n");
517 if (!(sbi->s_mount_state & EXT2_VALID_FS))
518 printk ("EXT2-fs warning: mounting unchecked fs, "
519 "running e2fsck is recommended\n");
520 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
521 printk ("EXT2-fs warning: mounting fs with errors, "
522 "running e2fsck is recommended\n");
523 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
524 le16_to_cpu(es->s_mnt_count) >=
525 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
526 printk ("EXT2-fs warning: maximal mount count reached, "
527 "running e2fsck is recommended\n");
528 else if (le32_to_cpu(es->s_checkinterval) &&
529 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
530 printk ("EXT2-fs warning: checktime reached, "
531 "running e2fsck is recommended\n");
532 if (!le16_to_cpu(es->s_max_mnt_count))
533 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
534 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
535 ext2_write_super(sb);
536 if (test_opt (sb, DEBUG))
537 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
538 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
539 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
542 EXT2_BLOCKS_PER_GROUP(sb),
543 EXT2_INODES_PER_GROUP(sb),
548 static int ext2_check_descriptors (struct super_block * sb)
552 struct ext2_sb_info *sbi = EXT2_SB(sb);
553 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
554 struct ext2_group_desc * gdp = NULL;
556 ext2_debug ("Checking group descriptors");
558 for (i = 0; i < sbi->s_groups_count; i++)
560 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
561 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data;
562 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
563 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
565 ext2_error (sb, "ext2_check_descriptors",
566 "Block bitmap for group %d"
567 " not in group (block %lu)!",
568 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
571 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
572 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
574 ext2_error (sb, "ext2_check_descriptors",
575 "Inode bitmap for group %d"
576 " not in group (block %lu)!",
577 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
580 if (le32_to_cpu(gdp->bg_inode_table) < block ||
581 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
582 block + EXT2_BLOCKS_PER_GROUP(sb))
584 ext2_error (sb, "ext2_check_descriptors",
585 "Inode table for group %d"
586 " not in group (block %lu)!",
587 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
590 block += EXT2_BLOCKS_PER_GROUP(sb);
596 #define log2(n) ffz(~(n))
599 * Maximal file size. There is a direct, and {,double-,triple-}indirect
600 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
601 * We need to be 1 filesystem block less than the 2^32 sector limit.
603 static loff_t ext2_max_size(int bits)
605 loff_t res = EXT2_NDIR_BLOCKS;
606 /* This constant is calculated to be the largest file size for a
607 * dense, 4k-blocksize file such that the total number of
608 * sectors in the file, including data and all indirect blocks,
609 * does not exceed 2^32. */
610 const loff_t upper_limit = 0x1ff7fffd000LL;
612 res += 1LL << (bits-2);
613 res += 1LL << (2*(bits-2));
614 res += 1LL << (3*(bits-2));
616 if (res > upper_limit)
621 static unsigned long descriptor_loc(struct super_block *sb,
622 unsigned long logic_sb_block,
625 struct ext2_sb_info *sbi = EXT2_SB(sb);
626 unsigned long bg, first_data_block, first_meta_bg;
629 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
630 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
632 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
634 return (logic_sb_block + nr + 1);
635 bg = sbi->s_desc_per_block * nr;
636 if (ext2_bg_has_super(sb, bg))
638 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
641 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
643 struct buffer_head * bh;
644 struct ext2_sb_info * sbi;
645 struct ext2_super_block * es;
648 unsigned long sb_block = get_sb_block(&data);
649 unsigned long logic_sb_block;
650 unsigned long offset = 0;
651 unsigned long def_mount_opts;
652 int blocksize = BLOCK_SIZE;
657 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
661 memset(sbi, 0, sizeof(*sbi));
664 * See what the current blocksize for the device is, and
665 * use that as the blocksize. Otherwise (or if the blocksize
666 * is smaller than the default) use the default.
667 * This is important for devices that have a hardware
668 * sectorsize that is larger than the default.
670 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
672 printk ("EXT2-fs: unable to set blocksize\n");
677 * If the superblock doesn't start on a hardware sector boundary,
678 * calculate the offset.
680 if (blocksize != BLOCK_SIZE) {
681 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
682 offset = (sb_block*BLOCK_SIZE) % blocksize;
684 logic_sb_block = sb_block;
687 if (!(bh = sb_bread(sb, logic_sb_block))) {
688 printk ("EXT2-fs: unable to read superblock\n");
692 * Note: s_es must be initialized as soon as possible because
693 * some ext2 macro-instructions depend on its value
695 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
697 sb->s_magic = le16_to_cpu(es->s_magic);
699 if (sb->s_magic != EXT2_SUPER_MAGIC)
702 /* Set defaults before we parse the mount options */
703 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
704 if (def_mount_opts & EXT2_DEFM_DEBUG)
705 set_opt(sbi->s_mount_opt, DEBUG);
706 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
707 set_opt(sbi->s_mount_opt, GRPID);
708 if (def_mount_opts & EXT2_DEFM_UID16)
709 set_opt(sbi->s_mount_opt, NO_UID32);
710 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
711 set_opt(sbi->s_mount_opt, XATTR_USER);
712 if (def_mount_opts & EXT2_DEFM_ACL)
713 set_opt(sbi->s_mount_opt, POSIX_ACL);
715 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
716 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
717 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
718 set_opt(sbi->s_mount_opt, ERRORS_RO);
720 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
721 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
723 if (!parse_options ((char *) data, sbi))
726 if (EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_TAGXID)
727 sb->s_flags |= MS_TAGXID;
728 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
729 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
732 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
733 EXT2_MOUNT_XIP if not */
735 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
736 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
737 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
738 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
739 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
740 "running e2fsck is recommended\n");
742 * Check feature flags regardless of the revision level, since we
743 * previously didn't change the revision level when setting the flags,
744 * so there is a chance incompat flags are set on a rev 0 filesystem.
746 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
748 printk("EXT2-fs: %s: couldn't mount because of "
749 "unsupported optional features (%x).\n",
750 sb->s_id, le32_to_cpu(features));
753 if (!(sb->s_flags & MS_RDONLY) &&
754 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
755 printk("EXT2-fs: %s: couldn't mount RDWR because of "
756 "unsupported optional features (%x).\n",
757 sb->s_id, le32_to_cpu(features));
761 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
763 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
764 (sb->s_blocksize != blocksize))) {
766 printk("XIP: Unsupported blocksize\n");
770 /* If the blocksize doesn't match, re-read the thing.. */
771 if (sb->s_blocksize != blocksize) {
774 if (!sb_set_blocksize(sb, blocksize)) {
775 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
779 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
780 offset = (sb_block*BLOCK_SIZE) % blocksize;
781 bh = sb_bread(sb, logic_sb_block);
783 printk("EXT2-fs: Couldn't read superblock on "
787 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
789 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
790 printk ("EXT2-fs: Magic mismatch, very weird !\n");
795 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
797 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
798 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
799 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
801 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
802 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
803 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
804 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
805 (sbi->s_inode_size > blocksize)) {
806 printk ("EXT2-fs: unsupported inode size: %d\n",
812 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
813 le32_to_cpu(es->s_log_frag_size);
814 if (sbi->s_frag_size == 0)
816 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
818 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
819 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
820 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
822 if (EXT2_INODE_SIZE(sb) == 0)
824 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
825 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
827 sbi->s_itb_per_group = sbi->s_inodes_per_group /
828 sbi->s_inodes_per_block;
829 sbi->s_desc_per_block = sb->s_blocksize /
830 sizeof (struct ext2_group_desc);
832 sbi->s_mount_state = le16_to_cpu(es->s_state);
833 sbi->s_addr_per_block_bits =
834 log2 (EXT2_ADDR_PER_BLOCK(sb));
835 sbi->s_desc_per_block_bits =
836 log2 (EXT2_DESC_PER_BLOCK(sb));
838 if (sb->s_magic != EXT2_SUPER_MAGIC)
841 if (sb->s_blocksize != bh->b_size) {
843 printk ("VFS: Unsupported blocksize on dev "
848 if (sb->s_blocksize != sbi->s_frag_size) {
849 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
850 sbi->s_frag_size, sb->s_blocksize);
854 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
855 printk ("EXT2-fs: #blocks per group too big: %lu\n",
856 sbi->s_blocks_per_group);
859 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
860 printk ("EXT2-fs: #fragments per group too big: %lu\n",
861 sbi->s_frags_per_group);
864 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
865 printk ("EXT2-fs: #inodes per group too big: %lu\n",
866 sbi->s_inodes_per_group);
870 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
872 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
873 le32_to_cpu(es->s_first_data_block) +
874 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
875 EXT2_BLOCKS_PER_GROUP(sb);
876 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
877 EXT2_DESC_PER_BLOCK(sb);
878 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
879 if (sbi->s_group_desc == NULL) {
880 printk ("EXT2-fs: not enough memory\n");
883 bgl_lock_init(&sbi->s_blockgroup_lock);
884 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
887 printk ("EXT2-fs: not enough memory\n");
888 goto failed_mount_group_desc;
890 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
891 for (i = 0; i < db_count; i++) {
892 block = descriptor_loc(sb, logic_sb_block, i);
893 sbi->s_group_desc[i] = sb_bread(sb, block);
894 if (!sbi->s_group_desc[i]) {
895 for (j = 0; j < i; j++)
896 brelse (sbi->s_group_desc[j]);
897 printk ("EXT2-fs: unable to read group descriptors\n");
898 goto failed_mount_group_desc;
901 if (!ext2_check_descriptors (sb)) {
902 printk ("EXT2-fs: group descriptors corrupted!\n");
905 sbi->s_gdb_count = db_count;
906 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
907 spin_lock_init(&sbi->s_next_gen_lock);
909 percpu_counter_init(&sbi->s_freeblocks_counter,
910 ext2_count_free_blocks(sb));
911 percpu_counter_init(&sbi->s_freeinodes_counter,
912 ext2_count_free_inodes(sb));
913 percpu_counter_init(&sbi->s_dirs_counter,
914 ext2_count_dirs(sb));
916 * set up enough so that it can read an inode
918 sb->s_op = &ext2_sops;
919 sb->s_export_op = &ext2_export_ops;
920 sb->s_xattr = ext2_xattr_handlers;
921 root = iget(sb, EXT2_ROOT_INO);
922 sb->s_root = d_alloc_root(root);
925 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
928 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
931 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
934 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
935 ext2_warning(sb, __FUNCTION__,
936 "mounting ext3 filesystem as ext2");
937 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
942 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
946 percpu_counter_destroy(&sbi->s_freeblocks_counter);
947 percpu_counter_destroy(&sbi->s_freeinodes_counter);
948 percpu_counter_destroy(&sbi->s_dirs_counter);
950 for (i = 0; i < db_count; i++)
951 brelse(sbi->s_group_desc[i]);
952 failed_mount_group_desc:
953 kfree(sbi->s_group_desc);
958 sb->s_fs_info = NULL;
963 static void ext2_commit_super (struct super_block * sb,
964 struct ext2_super_block * es)
966 es->s_wtime = cpu_to_le32(get_seconds());
967 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
971 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
973 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
974 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
975 es->s_wtime = cpu_to_le32(get_seconds());
976 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
977 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
982 * In the second extended file system, it is not necessary to
983 * write the super block since we use a mapping of the
984 * disk super block in a buffer.
986 * However, this function is still used to set the fs valid
987 * flags to 0. We need to set this flag to 0 since the fs
988 * may have been checked while mounted and e2fsck may have
989 * set s_state to EXT2_VALID_FS after some corrections.
992 void ext2_write_super (struct super_block * sb)
994 struct ext2_super_block * es;
996 if (!(sb->s_flags & MS_RDONLY)) {
997 es = EXT2_SB(sb)->s_es;
999 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
1000 ext2_debug ("setting valid to 0\n");
1001 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
1003 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1004 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1005 es->s_mtime = cpu_to_le32(get_seconds());
1006 ext2_sync_super(sb, es);
1008 ext2_commit_super (sb, es);
1014 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1016 struct ext2_sb_info * sbi = EXT2_SB(sb);
1017 struct ext2_super_block * es;
1018 unsigned long old_mount_opt = sbi->s_mount_opt;
1019 struct ext2_mount_options old_opts;
1020 unsigned long old_sb_flags;
1023 /* Store the old options */
1024 old_sb_flags = sb->s_flags;
1025 old_opts.s_mount_opt = sbi->s_mount_opt;
1026 old_opts.s_resuid = sbi->s_resuid;
1027 old_opts.s_resgid = sbi->s_resgid;
1030 * Allow the "check" option to be passed as a remount option.
1032 if (!parse_options (data, sbi)) {
1037 if ((sbi->s_mount_opt & EXT2_MOUNT_TAGXID) &&
1038 !(sb->s_flags & MS_TAGXID)) {
1039 printk("EXT2-fs: %s: tagxid not permitted on remount.\n",
1044 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1045 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1048 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
1049 (old_mount_opt & EXT2_MOUNT_XIP)) &&
1050 invalidate_inodes(sb))
1051 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\
1052 "xip remain in cache (no functional problem)");
1053 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1055 if (*flags & MS_RDONLY) {
1056 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1057 !(sbi->s_mount_state & EXT2_VALID_FS))
1060 * OK, we are remounting a valid rw partition rdonly, so set
1061 * the rdonly flag and then mark the partition as valid again.
1063 es->s_state = cpu_to_le16(sbi->s_mount_state);
1064 es->s_mtime = cpu_to_le32(get_seconds());
1066 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1067 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1069 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1070 "unsupported optional features (%x).\n",
1071 sb->s_id, le32_to_cpu(ret));
1076 * Mounting a RDONLY partition read-write, so reread and
1077 * store the current valid flag. (It may have been changed
1078 * by e2fsck since we originally mounted the partition.)
1080 sbi->s_mount_state = le16_to_cpu(es->s_state);
1081 if (!ext2_setup_super (sb, es, 0))
1082 sb->s_flags &= ~MS_RDONLY;
1084 ext2_sync_super(sb, es);
1087 sbi->s_mount_opt = old_opts.s_mount_opt;
1088 sbi->s_resuid = old_opts.s_resuid;
1089 sbi->s_resgid = old_opts.s_resgid;
1090 sb->s_flags = old_sb_flags;
1094 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1096 struct super_block *sb = dentry->d_sb;
1097 struct ext2_sb_info *sbi = EXT2_SB(sb);
1098 unsigned long overhead;
1101 if (test_opt (sb, MINIX_DF))
1105 * Compute the overhead (FS structures)
1109 * All of the blocks before first_data_block are
1112 overhead = le32_to_cpu(sbi->s_es->s_first_data_block);
1115 * Add the overhead attributed to the superblock and
1116 * block group descriptors. If the sparse superblocks
1117 * feature is turned on, then not all groups have this.
1119 for (i = 0; i < sbi->s_groups_count; i++)
1120 overhead += ext2_bg_has_super(sb, i) +
1121 ext2_bg_num_gdb(sb, i);
1124 * Every block group has an inode bitmap, a block
1125 * bitmap, and an inode table.
1127 overhead += (sbi->s_groups_count *
1128 (2 + sbi->s_itb_per_group));
1131 buf->f_type = EXT2_SUPER_MAGIC;
1132 buf->f_bsize = sb->s_blocksize;
1133 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead;
1134 buf->f_bfree = ext2_count_free_blocks(sb);
1135 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count);
1136 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count))
1138 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
1139 buf->f_ffree = ext2_count_free_inodes (sb);
1140 buf->f_namelen = EXT2_NAME_LEN;
1144 static int ext2_get_sb(struct file_system_type *fs_type,
1145 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1147 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
1152 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1153 * acquiring the locks... As quota files are never truncated and quota code
1154 * itself serializes the operations (and noone else should touch the files)
1155 * we don't have to be afraid of races */
1156 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1157 size_t len, loff_t off)
1159 struct inode *inode = sb_dqopt(sb)->files[type];
1160 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1162 int offset = off & (sb->s_blocksize - 1);
1165 struct buffer_head tmp_bh;
1166 struct buffer_head *bh;
1167 loff_t i_size = i_size_read(inode);
1171 if (off+len > i_size)
1174 while (toread > 0) {
1175 tocopy = sb->s_blocksize - offset < toread ?
1176 sb->s_blocksize - offset : toread;
1179 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1182 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1183 memset(data, 0, tocopy);
1185 bh = sb_bread(sb, tmp_bh.b_blocknr);
1188 memcpy(data, bh->b_data+offset, tocopy);
1199 /* Write to quotafile */
1200 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1201 const char *data, size_t len, loff_t off)
1203 struct inode *inode = sb_dqopt(sb)->files[type];
1204 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1206 int offset = off & (sb->s_blocksize - 1);
1208 size_t towrite = len;
1209 struct buffer_head tmp_bh;
1210 struct buffer_head *bh;
1212 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1213 while (towrite > 0) {
1214 tocopy = sb->s_blocksize - offset < towrite ?
1215 sb->s_blocksize - offset : towrite;
1218 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1221 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1222 bh = sb_bread(sb, tmp_bh.b_blocknr);
1224 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1230 memcpy(bh->b_data+offset, data, tocopy);
1231 flush_dcache_page(bh->b_page);
1232 set_buffer_uptodate(bh);
1233 mark_buffer_dirty(bh);
1244 if (inode->i_size < off+len-towrite)
1245 i_size_write(inode, off+len-towrite);
1247 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1248 mark_inode_dirty(inode);
1249 mutex_unlock(&inode->i_mutex);
1250 return len - towrite;
1255 static struct file_system_type ext2_fs_type = {
1256 .owner = THIS_MODULE,
1258 .get_sb = ext2_get_sb,
1259 .kill_sb = kill_block_super,
1260 .fs_flags = FS_REQUIRES_DEV,
1263 static int __init init_ext2_fs(void)
1265 int err = init_ext2_xattr();
1268 err = init_inodecache();
1271 err = register_filesystem(&ext2_fs_type);
1276 destroy_inodecache();
1282 static void __exit exit_ext2_fs(void)
1284 unregister_filesystem(&ext2_fs_type);
1285 destroy_inodecache();
1289 module_init(init_ext2_fs)
1290 module_exit(exit_ext2_fs)