blob: 813d589cc6c0d4b736e0bffd36f012ef41343853 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext3/super.c
3 *
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)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070037#include <linux/seq_file.h>
Ben Dooks381be252005-10-30 15:02:56 -080038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/uaccess.h>
Ben Dooks381be252005-10-30 15:02:56 -080040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xattr.h"
42#include "acl.h"
Ben Dooks381be252005-10-30 15:02:56 -080043#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Johann Lombardi71b96252006-01-08 01:03:20 -080045static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
46 unsigned long journal_devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
48 int);
49static void ext3_commit_super (struct super_block * sb,
50 struct ext3_super_block * es,
51 int sync);
52static void ext3_mark_recovery_complete(struct super_block * sb,
53 struct ext3_super_block * es);
54static void ext3_clear_journal_err(struct super_block * sb,
55 struct ext3_super_block * es);
56static int ext3_sync_fs(struct super_block *sb, int wait);
57static const char *ext3_decode_error(struct super_block * sb, int errno,
58 char nbuf[16]);
59static int ext3_remount (struct super_block * sb, int * flags, char * data);
David Howells726c3342006-06-23 02:02:58 -070060static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static void ext3_unlockfs(struct super_block *sb);
62static void ext3_write_super (struct super_block * sb);
63static void ext3_write_super_lockfs(struct super_block *sb);
64
65/*
66 * Wrappers for journal_start/end.
67 *
68 * The only special thing we need to do here is to make sure that all
69 * journal_end calls result in the superblock being marked dirty, so
70 * that sync() will call the filesystem's write_super callback if
71 * appropriate.
72 */
73handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74{
75 journal_t *journal;
76
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
79
80 /* Special case here: if the journal has aborted behind our
81 * backs (eg. EIO in the commit thread), then we still need to
82 * take the FS itself readonly cleanly. */
83 journal = EXT3_SB(sb)->s_journal;
84 if (is_journal_aborted(journal)) {
85 ext3_abort(sb, __FUNCTION__,
86 "Detected aborted journal");
87 return ERR_PTR(-EROFS);
88 }
89
90 return journal_start(journal, nblocks);
91}
92
93/*
94 * The only special thing we need to do here is to make sure that all
95 * journal_stop calls result in the superblock being marked dirty, so
96 * that sync() will call the filesystem's write_super callback if
97 * appropriate.
98 */
99int __ext3_journal_stop(const char *where, handle_t *handle)
100{
101 struct super_block *sb;
102 int err;
103 int rc;
104
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
108
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114}
115
116void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117 struct buffer_head *bh, handle_t *handle, int err)
118{
119 char nbuf[16];
120 const char *errstr = ext3_decode_error(NULL, err, nbuf);
121
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
124
125 if (!handle->h_err)
126 handle->h_err = err;
127
128 if (is_handle_aborted(handle))
129 return;
130
131 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
133
134 journal_abort_handle(handle);
135}
136
137/* Deal with the reporting of failure conditions on a filesystem such as
138 * inconsistencies detected or read IO failures.
139 *
140 * On ext2, we can store the error state of the filesystem in the
141 * superblock. That is not possible on ext3, because we may have other
142 * write ordering constraints on the superblock which prevent us from
143 * writing it out straight away; and given that the journal is about to
144 * be aborted, we can't rely on the current, or future, transactions to
145 * write out the superblock safely.
146 *
147 * We'll just use the journal_abort() error code to record an error in
148 * the journal instead. On recovery, the journal will compain about
149 * that error until we've noted it down and cleared it.
150 */
151
152static void ext3_handle_error(struct super_block *sb)
153{
154 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
155
156 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
157 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
158
159 if (sb->s_flags & MS_RDONLY)
160 return;
161
162 if (test_opt (sb, ERRORS_RO)) {
163 printk (KERN_CRIT "Remounting filesystem read-only\n");
164 sb->s_flags |= MS_RDONLY;
165 } else {
166 journal_t *journal = EXT3_SB(sb)->s_journal;
167
168 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
169 if (journal)
170 journal_abort(journal, -EIO);
171 }
172 if (test_opt(sb, ERRORS_PANIC))
173 panic("EXT3-fs (device %s): panic forced after error\n",
174 sb->s_id);
175 ext3_commit_super(sb, es, 1);
176}
177
178void ext3_error (struct super_block * sb, const char * function,
179 const char * fmt, ...)
180{
181 va_list args;
182
183 va_start(args, fmt);
184 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
185 vprintk(fmt, args);
186 printk("\n");
187 va_end(args);
188
189 ext3_handle_error(sb);
190}
191
192static const char *ext3_decode_error(struct super_block * sb, int errno,
193 char nbuf[16])
194{
195 char *errstr = NULL;
196
197 switch (errno) {
198 case -EIO:
199 errstr = "IO failure";
200 break;
201 case -ENOMEM:
202 errstr = "Out of memory";
203 break;
204 case -EROFS:
205 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
206 errstr = "Journal has aborted";
207 else
208 errstr = "Readonly filesystem";
209 break;
210 default:
211 /* If the caller passed in an extra buffer for unknown
212 * errors, textualise them now. Else we just return
213 * NULL. */
214 if (nbuf) {
215 /* Check for truncated error codes... */
216 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
217 errstr = nbuf;
218 }
219 break;
220 }
221
222 return errstr;
223}
224
225/* __ext3_std_error decodes expected errors from journaling functions
226 * automatically and invokes the appropriate error response. */
227
228void __ext3_std_error (struct super_block * sb, const char * function,
229 int errno)
230{
231 char nbuf[16];
Stephen Tweedie30121622005-05-18 11:47:17 -0400232 const char *errstr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Stephen Tweedie30121622005-05-18 11:47:17 -0400234 /* Special case: if the error is EROFS, and we're not already
235 * inside a transaction, then there's really no point in logging
236 * an error. */
237 if (errno == -EROFS && journal_current_handle() == NULL &&
238 (sb->s_flags & MS_RDONLY))
239 return;
240
241 errstr = ext3_decode_error(sb, errno, nbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
243 sb->s_id, function, errstr);
244
245 ext3_handle_error(sb);
246}
247
248/*
249 * ext3_abort is a much stronger failure handler than ext3_error. The
250 * abort function may be used to deal with unrecoverable failures such
251 * as journal IO errors or ENOMEM at a critical moment in log management.
252 *
253 * We unconditionally force the filesystem into an ABORT|READONLY state,
254 * unless the error response on the fs has been set to panic in which
255 * case we take the easy way out and panic immediately.
256 */
257
258void ext3_abort (struct super_block * sb, const char * function,
259 const char * fmt, ...)
260{
261 va_list args;
262
263 printk (KERN_CRIT "ext3_abort called.\n");
264
265 va_start(args, fmt);
266 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
267 vprintk(fmt, args);
268 printk("\n");
269 va_end(args);
270
271 if (test_opt(sb, ERRORS_PANIC))
272 panic("EXT3-fs panic from previous error\n");
273
274 if (sb->s_flags & MS_RDONLY)
275 return;
276
277 printk(KERN_CRIT "Remounting filesystem read-only\n");
278 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
279 sb->s_flags |= MS_RDONLY;
280 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
281 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
282}
283
284void ext3_warning (struct super_block * sb, const char * function,
285 const char * fmt, ...)
286{
287 va_list args;
288
289 va_start(args, fmt);
290 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
291 sb->s_id, function);
292 vprintk(fmt, args);
293 printk("\n");
294 va_end(args);
295}
296
297void ext3_update_dynamic_rev(struct super_block *sb)
298{
299 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
300
301 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
302 return;
303
304 ext3_warning(sb, __FUNCTION__,
305 "updating to rev %d because of new feature flag, "
306 "running e2fsck is recommended",
307 EXT3_DYNAMIC_REV);
308
309 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
310 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
311 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
312 /* leave es->s_feature_*compat flags alone */
313 /* es->s_uuid will be set by e2fsck if empty */
314
315 /*
316 * The rest of the superblock fields should be zero, and if not it
317 * means they are likely already in use, so leave them alone. We
318 * can leave it up to e2fsck to clean up any inconsistencies there.
319 */
320}
321
322/*
323 * Open the external journal device
324 */
325static struct block_device *ext3_blkdev_get(dev_t dev)
326{
327 struct block_device *bdev;
328 char b[BDEVNAME_SIZE];
329
330 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
331 if (IS_ERR(bdev))
332 goto fail;
333 return bdev;
334
335fail:
336 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
337 __bdevname(dev, b), PTR_ERR(bdev));
338 return NULL;
339}
340
341/*
342 * Release the journal device
343 */
344static int ext3_blkdev_put(struct block_device *bdev)
345{
346 bd_release(bdev);
347 return blkdev_put(bdev);
348}
349
350static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
351{
352 struct block_device *bdev;
353 int ret = -ENODEV;
354
355 bdev = sbi->journal_bdev;
356 if (bdev) {
357 ret = ext3_blkdev_put(bdev);
358 sbi->journal_bdev = NULL;
359 }
360 return ret;
361}
362
363static inline struct inode *orphan_list_entry(struct list_head *l)
364{
365 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
366}
367
368static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
369{
370 struct list_head *l;
371
372 printk(KERN_ERR "sb orphan head is %d\n",
373 le32_to_cpu(sbi->s_es->s_last_orphan));
374
375 printk(KERN_ERR "sb_info orphan list:\n");
376 list_for_each(l, &sbi->s_orphan) {
377 struct inode *inode = orphan_list_entry(l);
378 printk(KERN_ERR " "
379 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
380 inode->i_sb->s_id, inode->i_ino, inode,
381 inode->i_mode, inode->i_nlink,
382 NEXT_ORPHAN(inode));
383 }
384}
385
386static void ext3_put_super (struct super_block * sb)
387{
388 struct ext3_sb_info *sbi = EXT3_SB(sb);
389 struct ext3_super_block *es = sbi->s_es;
390 int i;
391
392 ext3_xattr_put_super(sb);
393 journal_destroy(sbi->s_journal);
394 if (!(sb->s_flags & MS_RDONLY)) {
395 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
396 es->s_state = cpu_to_le16(sbi->s_mount_state);
397 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
398 mark_buffer_dirty(sbi->s_sbh);
399 ext3_commit_super(sb, es, 1);
400 }
401
402 for (i = 0; i < sbi->s_gdb_count; i++)
403 brelse(sbi->s_group_desc[i]);
404 kfree(sbi->s_group_desc);
405 percpu_counter_destroy(&sbi->s_freeblocks_counter);
406 percpu_counter_destroy(&sbi->s_freeinodes_counter);
407 percpu_counter_destroy(&sbi->s_dirs_counter);
408 brelse(sbi->s_sbh);
409#ifdef CONFIG_QUOTA
410 for (i = 0; i < MAXQUOTAS; i++)
411 kfree(sbi->s_qf_names[i]);
412#endif
413
414 /* Debugging code just in case the in-memory inode orphan list
415 * isn't empty. The on-disk one can be non-empty if we've
416 * detected an error and taken the fs readonly, but the
417 * in-memory list had better be clean by this point. */
418 if (!list_empty(&sbi->s_orphan))
419 dump_orphan_list(sb, sbi);
420 J_ASSERT(list_empty(&sbi->s_orphan));
421
422 invalidate_bdev(sb->s_bdev, 0);
423 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
424 /*
425 * Invalidate the journal device's buffers. We don't want them
426 * floating about in memory - the physical journal device may
427 * hotswapped, and it breaks the `ro-after' testing code.
428 */
429 sync_blockdev(sbi->journal_bdev);
430 invalidate_bdev(sbi->journal_bdev, 0);
431 ext3_blkdev_remove(sbi);
432 }
433 sb->s_fs_info = NULL;
434 kfree(sbi);
435 return;
436}
437
438static kmem_cache_t *ext3_inode_cachep;
439
440/*
441 * Called inside transaction, so use GFP_NOFS
442 */
443static struct inode *ext3_alloc_inode(struct super_block *sb)
444{
445 struct ext3_inode_info *ei;
446
447 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
448 if (!ei)
449 return NULL;
450#ifdef CONFIG_EXT3_FS_POSIX_ACL
451 ei->i_acl = EXT3_ACL_NOT_CACHED;
452 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
453#endif
454 ei->i_block_alloc_info = NULL;
455 ei->vfs_inode.i_version = 1;
456 return &ei->vfs_inode;
457}
458
459static void ext3_destroy_inode(struct inode *inode)
460{
461 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
462}
463
464static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
465{
466 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
467
468 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
469 SLAB_CTOR_CONSTRUCTOR) {
470 INIT_LIST_HEAD(&ei->i_orphan);
471#ifdef CONFIG_EXT3_FS_XATTR
472 init_rwsem(&ei->xattr_sem);
473#endif
Arjan van de Ven97461512006-03-23 03:00:42 -0800474 mutex_init(&ei->truncate_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 inode_init_once(&ei->vfs_inode);
476 }
477}
478
479static int init_inodecache(void)
480{
481 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
482 sizeof(struct ext3_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800483 0, (SLAB_RECLAIM_ACCOUNT|
484 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 init_once, NULL);
486 if (ext3_inode_cachep == NULL)
487 return -ENOMEM;
488 return 0;
489}
490
491static void destroy_inodecache(void)
492{
493 if (kmem_cache_destroy(ext3_inode_cachep))
494 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
495}
496
497static void ext3_clear_inode(struct inode *inode)
498{
499 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
500#ifdef CONFIG_EXT3_FS_POSIX_ACL
Andrew Mortone6022602006-06-23 02:05:32 -0700501 if (EXT3_I(inode)->i_acl &&
502 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
503 posix_acl_release(EXT3_I(inode)->i_acl);
504 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
505 }
506 if (EXT3_I(inode)->i_default_acl &&
507 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
508 posix_acl_release(EXT3_I(inode)->i_default_acl);
509 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
510 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511#endif
512 ext3_discard_reservation(inode);
513 EXT3_I(inode)->i_block_alloc_info = NULL;
Andrew Mortone6022602006-06-23 02:05:32 -0700514 if (unlikely(rsv))
515 kfree(rsv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516}
517
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200518static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
Mark Bellon8fc27512005-09-06 15:16:54 -0700519{
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200520#if defined(CONFIG_QUOTA)
OGAWA Hirofumi275abf52005-09-22 21:44:03 -0700521 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Mark Bellon8fc27512005-09-06 15:16:54 -0700523 if (sbi->s_jquota_fmt)
524 seq_printf(seq, ",jqfmt=%s",
525 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
526
527 if (sbi->s_qf_names[USRQUOTA])
528 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
529
530 if (sbi->s_qf_names[GRPQUOTA])
531 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
532
533 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
534 seq_puts(seq, ",usrquota");
535
536 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
537 seq_puts(seq, ",grpquota");
538#endif
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200539}
540
541static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
542{
543 struct super_block *sb = vfs->mnt_sb;
544
545 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
546 seq_puts(seq, ",data=journal");
547 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
548 seq_puts(seq, ",data=ordered");
549 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
550 seq_puts(seq, ",data=writeback");
551
552 ext3_show_quota_options(seq, sb);
Mark Bellon8fc27512005-09-06 15:16:54 -0700553
554 return 0;
555}
556
557#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
559#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
560
561static int ext3_dquot_initialize(struct inode *inode, int type);
562static int ext3_dquot_drop(struct inode *inode);
563static int ext3_write_dquot(struct dquot *dquot);
564static int ext3_acquire_dquot(struct dquot *dquot);
565static int ext3_release_dquot(struct dquot *dquot);
566static int ext3_mark_dquot_dirty(struct dquot *dquot);
567static int ext3_write_info(struct super_block *sb, int type);
568static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
569static int ext3_quota_on_mount(struct super_block *sb, int type);
570static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
571 size_t len, loff_t off);
572static ssize_t ext3_quota_write(struct super_block *sb, int type,
573 const char *data, size_t len, loff_t off);
574
575static struct dquot_operations ext3_quota_operations = {
576 .initialize = ext3_dquot_initialize,
577 .drop = ext3_dquot_drop,
578 .alloc_space = dquot_alloc_space,
579 .alloc_inode = dquot_alloc_inode,
580 .free_space = dquot_free_space,
581 .free_inode = dquot_free_inode,
582 .transfer = dquot_transfer,
583 .write_dquot = ext3_write_dquot,
584 .acquire_dquot = ext3_acquire_dquot,
585 .release_dquot = ext3_release_dquot,
586 .mark_dirty = ext3_mark_dquot_dirty,
587 .write_info = ext3_write_info
588};
589
590static struct quotactl_ops ext3_qctl_operations = {
591 .quota_on = ext3_quota_on,
592 .quota_off = vfs_quota_off,
593 .quota_sync = vfs_quota_sync,
594 .get_info = vfs_get_dqinfo,
595 .set_info = vfs_set_dqinfo,
596 .get_dqblk = vfs_get_dqblk,
597 .set_dqblk = vfs_set_dqblk
598};
599#endif
600
601static struct super_operations ext3_sops = {
602 .alloc_inode = ext3_alloc_inode,
603 .destroy_inode = ext3_destroy_inode,
604 .read_inode = ext3_read_inode,
605 .write_inode = ext3_write_inode,
606 .dirty_inode = ext3_dirty_inode,
607 .delete_inode = ext3_delete_inode,
608 .put_super = ext3_put_super,
609 .write_super = ext3_write_super,
610 .sync_fs = ext3_sync_fs,
611 .write_super_lockfs = ext3_write_super_lockfs,
612 .unlockfs = ext3_unlockfs,
613 .statfs = ext3_statfs,
614 .remount_fs = ext3_remount,
615 .clear_inode = ext3_clear_inode,
Mark Bellon8fc27512005-09-06 15:16:54 -0700616 .show_options = ext3_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617#ifdef CONFIG_QUOTA
618 .quota_read = ext3_quota_read,
619 .quota_write = ext3_quota_write,
620#endif
621};
622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623static struct export_operations ext3_export_ops = {
624 .get_parent = ext3_get_parent,
625};
626
627enum {
628 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
629 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Adrian Bunk2860b732005-11-08 21:34:59 -0800630 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Badari Pulavartyade1a292006-06-26 00:25:04 -0700632 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
Johann Lombardi71b96252006-01-08 01:03:20 -0800633 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
635 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara1f545872005-06-23 22:01:04 -0700636 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Mark Bellon8fc27512005-09-06 15:16:54 -0700637 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
638 Opt_grpquota
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639};
640
641static match_table_t tokens = {
642 {Opt_bsd_df, "bsddf"},
643 {Opt_minix_df, "minixdf"},
644 {Opt_grpid, "grpid"},
645 {Opt_grpid, "bsdgroups"},
646 {Opt_nogrpid, "nogrpid"},
647 {Opt_nogrpid, "sysvgroups"},
648 {Opt_resgid, "resgid=%u"},
649 {Opt_resuid, "resuid=%u"},
650 {Opt_sb, "sb=%u"},
651 {Opt_err_cont, "errors=continue"},
652 {Opt_err_panic, "errors=panic"},
653 {Opt_err_ro, "errors=remount-ro"},
654 {Opt_nouid32, "nouid32"},
655 {Opt_nocheck, "nocheck"},
656 {Opt_nocheck, "check=none"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 {Opt_debug, "debug"},
658 {Opt_oldalloc, "oldalloc"},
659 {Opt_orlov, "orlov"},
660 {Opt_user_xattr, "user_xattr"},
661 {Opt_nouser_xattr, "nouser_xattr"},
662 {Opt_acl, "acl"},
663 {Opt_noacl, "noacl"},
664 {Opt_reservation, "reservation"},
665 {Opt_noreservation, "noreservation"},
666 {Opt_noload, "noload"},
667 {Opt_nobh, "nobh"},
Badari Pulavartyade1a292006-06-26 00:25:04 -0700668 {Opt_bh, "bh"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 {Opt_commit, "commit=%u"},
670 {Opt_journal_update, "journal=update"},
671 {Opt_journal_inum, "journal=%u"},
Johann Lombardi71b96252006-01-08 01:03:20 -0800672 {Opt_journal_dev, "journal_dev=%u"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 {Opt_abort, "abort"},
674 {Opt_data_journal, "data=journal"},
675 {Opt_data_ordered, "data=ordered"},
676 {Opt_data_writeback, "data=writeback"},
677 {Opt_offusrjquota, "usrjquota="},
678 {Opt_usrjquota, "usrjquota=%s"},
679 {Opt_offgrpjquota, "grpjquota="},
680 {Opt_grpjquota, "grpjquota=%s"},
681 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
682 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700683 {Opt_grpquota, "grpquota"},
Jan Kara1f545872005-06-23 22:01:04 -0700684 {Opt_noquota, "noquota"},
685 {Opt_quota, "quota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700686 {Opt_usrquota, "usrquota"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 {Opt_barrier, "barrier=%u"},
688 {Opt_err, NULL},
689 {Opt_resize, "resize"},
690};
691
Mingming Cao43d23f92006-06-25 05:48:07 -0700692static ext3_fsblk_t get_sb_block(void **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Mingming Cao43d23f92006-06-25 05:48:07 -0700694 ext3_fsblk_t sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 char *options = (char *) *data;
696
697 if (!options || strncmp(options, "sb=", 3) != 0)
698 return 1; /* Default location */
699 options += 3;
Mingming Cao43d23f92006-06-25 05:48:07 -0700700 /*todo: use simple_strtoll with >32bit ext3 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 sb_block = simple_strtoul(options, &options, 0);
702 if (*options && *options != ',') {
703 printk("EXT3-fs: Invalid sb specification: %s\n",
704 (char *) *data);
705 return 1;
706 }
707 if (*options == ',')
708 options++;
709 *data = (void *) options;
710 return sb_block;
711}
712
Johann Lombardi71b96252006-01-08 01:03:20 -0800713static int parse_options (char *options, struct super_block *sb,
714 unsigned long *inum, unsigned long *journal_devnum,
Mingming Cao43d23f92006-06-25 05:48:07 -0700715 ext3_fsblk_t *n_blocks_count, int is_remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
717 struct ext3_sb_info *sbi = EXT3_SB(sb);
718 char * p;
719 substring_t args[MAX_OPT_ARGS];
720 int data_opt = 0;
721 int option;
722#ifdef CONFIG_QUOTA
723 int qtype;
724 char *qname;
725#endif
726
727 if (!options)
728 return 1;
729
730 while ((p = strsep (&options, ",")) != NULL) {
731 int token;
732 if (!*p)
733 continue;
734
735 token = match_token(p, tokens, args);
736 switch (token) {
737 case Opt_bsd_df:
738 clear_opt (sbi->s_mount_opt, MINIX_DF);
739 break;
740 case Opt_minix_df:
741 set_opt (sbi->s_mount_opt, MINIX_DF);
742 break;
743 case Opt_grpid:
744 set_opt (sbi->s_mount_opt, GRPID);
745 break;
746 case Opt_nogrpid:
747 clear_opt (sbi->s_mount_opt, GRPID);
748 break;
749 case Opt_resuid:
750 if (match_int(&args[0], &option))
751 return 0;
752 sbi->s_resuid = option;
753 break;
754 case Opt_resgid:
755 if (match_int(&args[0], &option))
756 return 0;
757 sbi->s_resgid = option;
758 break;
759 case Opt_sb:
760 /* handled by get_sb_block() instead of here */
761 /* *sb_block = match_int(&args[0]); */
762 break;
763 case Opt_err_panic:
764 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
765 clear_opt (sbi->s_mount_opt, ERRORS_RO);
766 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
767 break;
768 case Opt_err_ro:
769 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
770 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
771 set_opt (sbi->s_mount_opt, ERRORS_RO);
772 break;
773 case Opt_err_cont:
774 clear_opt (sbi->s_mount_opt, ERRORS_RO);
775 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
776 set_opt (sbi->s_mount_opt, ERRORS_CONT);
777 break;
778 case Opt_nouid32:
779 set_opt (sbi->s_mount_opt, NO_UID32);
780 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 case Opt_nocheck:
782 clear_opt (sbi->s_mount_opt, CHECK);
783 break;
784 case Opt_debug:
785 set_opt (sbi->s_mount_opt, DEBUG);
786 break;
787 case Opt_oldalloc:
788 set_opt (sbi->s_mount_opt, OLDALLOC);
789 break;
790 case Opt_orlov:
791 clear_opt (sbi->s_mount_opt, OLDALLOC);
792 break;
793#ifdef CONFIG_EXT3_FS_XATTR
794 case Opt_user_xattr:
795 set_opt (sbi->s_mount_opt, XATTR_USER);
796 break;
797 case Opt_nouser_xattr:
798 clear_opt (sbi->s_mount_opt, XATTR_USER);
799 break;
800#else
801 case Opt_user_xattr:
802 case Opt_nouser_xattr:
803 printk("EXT3 (no)user_xattr options not supported\n");
804 break;
805#endif
806#ifdef CONFIG_EXT3_FS_POSIX_ACL
807 case Opt_acl:
808 set_opt(sbi->s_mount_opt, POSIX_ACL);
809 break;
810 case Opt_noacl:
811 clear_opt(sbi->s_mount_opt, POSIX_ACL);
812 break;
813#else
814 case Opt_acl:
815 case Opt_noacl:
816 printk("EXT3 (no)acl options not supported\n");
817 break;
818#endif
819 case Opt_reservation:
820 set_opt(sbi->s_mount_opt, RESERVATION);
821 break;
822 case Opt_noreservation:
823 clear_opt(sbi->s_mount_opt, RESERVATION);
824 break;
825 case Opt_journal_update:
826 /* @@@ FIXME */
827 /* Eventually we will want to be able to create
828 a journal file here. For now, only allow the
829 user to specify an existing inode to be the
830 journal file. */
831 if (is_remount) {
832 printk(KERN_ERR "EXT3-fs: cannot specify "
833 "journal on remount\n");
834 return 0;
835 }
836 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
837 break;
838 case Opt_journal_inum:
839 if (is_remount) {
840 printk(KERN_ERR "EXT3-fs: cannot specify "
841 "journal on remount\n");
842 return 0;
843 }
844 if (match_int(&args[0], &option))
845 return 0;
846 *inum = option;
847 break;
Johann Lombardi71b96252006-01-08 01:03:20 -0800848 case Opt_journal_dev:
849 if (is_remount) {
850 printk(KERN_ERR "EXT3-fs: cannot specify "
851 "journal on remount\n");
852 return 0;
853 }
854 if (match_int(&args[0], &option))
855 return 0;
856 *journal_devnum = option;
857 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 case Opt_noload:
859 set_opt (sbi->s_mount_opt, NOLOAD);
860 break;
861 case Opt_commit:
862 if (match_int(&args[0], &option))
863 return 0;
864 if (option < 0)
865 return 0;
866 if (option == 0)
867 option = JBD_DEFAULT_MAX_COMMIT_AGE;
868 sbi->s_commit_interval = HZ * option;
869 break;
870 case Opt_data_journal:
871 data_opt = EXT3_MOUNT_JOURNAL_DATA;
872 goto datacheck;
873 case Opt_data_ordered:
874 data_opt = EXT3_MOUNT_ORDERED_DATA;
875 goto datacheck;
876 case Opt_data_writeback:
877 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
878 datacheck:
879 if (is_remount) {
880 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
881 != data_opt) {
882 printk(KERN_ERR
883 "EXT3-fs: cannot change data "
884 "mode on remount\n");
885 return 0;
886 }
887 } else {
888 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
889 sbi->s_mount_opt |= data_opt;
890 }
891 break;
892#ifdef CONFIG_QUOTA
893 case Opt_usrjquota:
894 qtype = USRQUOTA;
895 goto set_qf_name;
896 case Opt_grpjquota:
897 qtype = GRPQUOTA;
898set_qf_name:
899 if (sb_any_quota_enabled(sb)) {
900 printk(KERN_ERR
901 "EXT3-fs: Cannot change journalled "
902 "quota options when quota turned on.\n");
903 return 0;
904 }
905 qname = match_strdup(&args[0]);
906 if (!qname) {
907 printk(KERN_ERR
908 "EXT3-fs: not enough memory for "
909 "storing quotafile name.\n");
910 return 0;
911 }
912 if (sbi->s_qf_names[qtype] &&
913 strcmp(sbi->s_qf_names[qtype], qname)) {
914 printk(KERN_ERR
915 "EXT3-fs: %s quota file already "
916 "specified.\n", QTYPE2NAME(qtype));
917 kfree(qname);
918 return 0;
919 }
920 sbi->s_qf_names[qtype] = qname;
921 if (strchr(sbi->s_qf_names[qtype], '/')) {
922 printk(KERN_ERR
923 "EXT3-fs: quotafile must be on "
924 "filesystem root.\n");
925 kfree(sbi->s_qf_names[qtype]);
926 sbi->s_qf_names[qtype] = NULL;
927 return 0;
928 }
Jan Kara1f545872005-06-23 22:01:04 -0700929 set_opt(sbi->s_mount_opt, QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 break;
931 case Opt_offusrjquota:
932 qtype = USRQUOTA;
933 goto clear_qf_name;
934 case Opt_offgrpjquota:
935 qtype = GRPQUOTA;
936clear_qf_name:
937 if (sb_any_quota_enabled(sb)) {
938 printk(KERN_ERR "EXT3-fs: Cannot change "
939 "journalled quota options when "
940 "quota turned on.\n");
941 return 0;
942 }
Jan Kara08c6a962005-07-12 13:58:28 -0700943 /*
944 * The space will be released later when all options
945 * are confirmed to be correct
946 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 sbi->s_qf_names[qtype] = NULL;
948 break;
949 case Opt_jqfmt_vfsold:
950 sbi->s_jquota_fmt = QFMT_VFS_OLD;
951 break;
952 case Opt_jqfmt_vfsv0:
953 sbi->s_jquota_fmt = QFMT_VFS_V0;
954 break;
Jan Kara1f545872005-06-23 22:01:04 -0700955 case Opt_quota:
Mark Bellon8fc27512005-09-06 15:16:54 -0700956 case Opt_usrquota:
Jan Kara1f545872005-06-23 22:01:04 -0700957 set_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -0700958 set_opt(sbi->s_mount_opt, USRQUOTA);
959 break;
960 case Opt_grpquota:
961 set_opt(sbi->s_mount_opt, QUOTA);
962 set_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -0700963 break;
964 case Opt_noquota:
965 if (sb_any_quota_enabled(sb)) {
966 printk(KERN_ERR "EXT3-fs: Cannot change quota "
967 "options when quota turned on.\n");
968 return 0;
969 }
970 clear_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -0700971 clear_opt(sbi->s_mount_opt, USRQUOTA);
972 clear_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -0700973 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974#else
Mark Bellon8fc27512005-09-06 15:16:54 -0700975 case Opt_quota:
976 case Opt_usrquota:
977 case Opt_grpquota:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 case Opt_usrjquota:
979 case Opt_grpjquota:
980 case Opt_offusrjquota:
981 case Opt_offgrpjquota:
982 case Opt_jqfmt_vfsold:
983 case Opt_jqfmt_vfsv0:
984 printk(KERN_ERR
985 "EXT3-fs: journalled quota options not "
986 "supported.\n");
987 break;
Jan Kara1f545872005-06-23 22:01:04 -0700988 case Opt_noquota:
989 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990#endif
991 case Opt_abort:
992 set_opt(sbi->s_mount_opt, ABORT);
993 break;
994 case Opt_barrier:
995 if (match_int(&args[0], &option))
996 return 0;
997 if (option)
998 set_opt(sbi->s_mount_opt, BARRIER);
999 else
1000 clear_opt(sbi->s_mount_opt, BARRIER);
1001 break;
1002 case Opt_ignore:
1003 break;
1004 case Opt_resize:
Jan Kara08c6a962005-07-12 13:58:28 -07001005 if (!is_remount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 printk("EXT3-fs: resize option only available "
1007 "for remount\n");
1008 return 0;
1009 }
KAMBAROV, ZAURc7f17212005-06-28 20:45:11 -07001010 if (match_int(&args[0], &option) != 0)
1011 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 *n_blocks_count = option;
1013 break;
1014 case Opt_nobh:
1015 set_opt(sbi->s_mount_opt, NOBH);
1016 break;
Badari Pulavartyade1a292006-06-26 00:25:04 -07001017 case Opt_bh:
1018 clear_opt(sbi->s_mount_opt, NOBH);
1019 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 default:
1021 printk (KERN_ERR
1022 "EXT3-fs: Unrecognized mount option \"%s\" "
1023 "or missing value\n", p);
1024 return 0;
1025 }
1026 }
1027#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -07001028 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1029 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1030 sbi->s_qf_names[USRQUOTA])
1031 clear_opt(sbi->s_mount_opt, USRQUOTA);
1032
1033 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1034 sbi->s_qf_names[GRPQUOTA])
1035 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1036
1037 if ((sbi->s_qf_names[USRQUOTA] &&
1038 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1039 (sbi->s_qf_names[GRPQUOTA] &&
1040 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1041 printk(KERN_ERR "EXT3-fs: old and new quota "
1042 "format mixing.\n");
1043 return 0;
1044 }
1045
1046 if (!sbi->s_jquota_fmt) {
1047 printk(KERN_ERR "EXT3-fs: journalled quota format "
1048 "not specified.\n");
1049 return 0;
1050 }
1051 } else {
1052 if (sbi->s_jquota_fmt) {
1053 printk(KERN_ERR "EXT3-fs: journalled quota format "
1054 "specified with no journalling "
1055 "enabled.\n");
1056 return 0;
1057 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 }
1059#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 return 1;
1061}
1062
1063static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1064 int read_only)
1065{
1066 struct ext3_sb_info *sbi = EXT3_SB(sb);
1067 int res = 0;
1068
1069 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1070 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1071 "forcing read-only mode\n");
1072 res = MS_RDONLY;
1073 }
1074 if (read_only)
1075 return res;
1076 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1077 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1078 "running e2fsck is recommended\n");
1079 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1080 printk (KERN_WARNING
1081 "EXT3-fs warning: mounting fs with errors, "
1082 "running e2fsck is recommended\n");
1083 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1084 le16_to_cpu(es->s_mnt_count) >=
1085 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1086 printk (KERN_WARNING
1087 "EXT3-fs warning: maximal mount count reached, "
1088 "running e2fsck is recommended\n");
1089 else if (le32_to_cpu(es->s_checkinterval) &&
1090 (le32_to_cpu(es->s_lastcheck) +
1091 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1092 printk (KERN_WARNING
1093 "EXT3-fs warning: checktime reached, "
1094 "running e2fsck is recommended\n");
1095#if 0
1096 /* @@@ We _will_ want to clear the valid bit if we find
1097 inconsistencies, to force a fsck at reboot. But for
1098 a plain journaled filesystem we can keep it set as
1099 valid forever! :) */
1100 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1101#endif
1102 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1103 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1104 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1105 es->s_mtime = cpu_to_le32(get_seconds());
1106 ext3_update_dynamic_rev(sb);
1107 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1108
1109 ext3_commit_super(sb, es, 1);
1110 if (test_opt(sb, DEBUG))
1111 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1112 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1113 sb->s_blocksize,
1114 sbi->s_groups_count,
1115 EXT3_BLOCKS_PER_GROUP(sb),
1116 EXT3_INODES_PER_GROUP(sb),
1117 sbi->s_mount_opt);
1118
1119 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1120 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1121 char b[BDEVNAME_SIZE];
1122
1123 printk("external journal on %s\n",
1124 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1125 } else {
1126 printk("internal journal\n");
1127 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 return res;
1129}
1130
1131/* Called at mount-time, super-block is locked */
1132static int ext3_check_descriptors (struct super_block * sb)
1133{
1134 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001135 ext3_fsblk_t block = le32_to_cpu(sbi->s_es->s_first_data_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 struct ext3_group_desc * gdp = NULL;
1137 int desc_block = 0;
1138 int i;
1139
1140 ext3_debug ("Checking group descriptors");
1141
1142 for (i = 0; i < sbi->s_groups_count; i++)
1143 {
1144 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1145 gdp = (struct ext3_group_desc *)
1146 sbi->s_group_desc[desc_block++]->b_data;
1147 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1148 le32_to_cpu(gdp->bg_block_bitmap) >=
1149 block + EXT3_BLOCKS_PER_GROUP(sb))
1150 {
1151 ext3_error (sb, "ext3_check_descriptors",
1152 "Block bitmap for group %d"
1153 " not in group (block %lu)!",
1154 i, (unsigned long)
1155 le32_to_cpu(gdp->bg_block_bitmap));
1156 return 0;
1157 }
1158 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1159 le32_to_cpu(gdp->bg_inode_bitmap) >=
1160 block + EXT3_BLOCKS_PER_GROUP(sb))
1161 {
1162 ext3_error (sb, "ext3_check_descriptors",
1163 "Inode bitmap for group %d"
1164 " not in group (block %lu)!",
1165 i, (unsigned long)
1166 le32_to_cpu(gdp->bg_inode_bitmap));
1167 return 0;
1168 }
1169 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1170 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1171 block + EXT3_BLOCKS_PER_GROUP(sb))
1172 {
1173 ext3_error (sb, "ext3_check_descriptors",
1174 "Inode table for group %d"
1175 " not in group (block %lu)!",
1176 i, (unsigned long)
1177 le32_to_cpu(gdp->bg_inode_table));
1178 return 0;
1179 }
1180 block += EXT3_BLOCKS_PER_GROUP(sb);
1181 gdp++;
1182 }
1183
1184 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1185 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1186 return 1;
1187}
1188
1189
1190/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1191 * the superblock) which were deleted from all directories, but held open by
1192 * a process at the time of a crash. We walk the list and try to delete these
1193 * inodes at recovery time (only with a read-write filesystem).
1194 *
1195 * In order to keep the orphan inode chain consistent during traversal (in
1196 * case of crash during recovery), we link each inode into the superblock
1197 * orphan list_head and handle it the same way as an inode deletion during
1198 * normal operation (which journals the operations for us).
1199 *
1200 * We only do an iget() and an iput() on each inode, which is very safe if we
1201 * accidentally point at an in-use or already deleted inode. The worst that
1202 * can happen in this case is that we get a "bit already cleared" message from
1203 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1204 * e2fsck was run on this filesystem, and it must have already done the orphan
1205 * inode cleanup for us, so we can safely abort without any further action.
1206 */
1207static void ext3_orphan_cleanup (struct super_block * sb,
1208 struct ext3_super_block * es)
1209{
1210 unsigned int s_flags = sb->s_flags;
1211 int nr_orphans = 0, nr_truncates = 0;
1212#ifdef CONFIG_QUOTA
1213 int i;
1214#endif
1215 if (!es->s_last_orphan) {
1216 jbd_debug(4, "no orphan inodes to clean up\n");
1217 return;
1218 }
1219
1220 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1221 if (es->s_last_orphan)
1222 jbd_debug(1, "Errors on filesystem, "
1223 "clearing orphan list.\n");
1224 es->s_last_orphan = 0;
1225 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1226 return;
1227 }
1228
1229 if (s_flags & MS_RDONLY) {
1230 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1231 sb->s_id);
1232 sb->s_flags &= ~MS_RDONLY;
1233 }
1234#ifdef CONFIG_QUOTA
1235 /* Needed for iput() to work correctly and not trash data */
1236 sb->s_flags |= MS_ACTIVE;
1237 /* Turn on quotas so that they are updated correctly */
1238 for (i = 0; i < MAXQUOTAS; i++) {
1239 if (EXT3_SB(sb)->s_qf_names[i]) {
1240 int ret = ext3_quota_on_mount(sb, i);
1241 if (ret < 0)
1242 printk(KERN_ERR
1243 "EXT3-fs: Cannot turn on journalled "
1244 "quota: error %d\n", ret);
1245 }
1246 }
1247#endif
1248
1249 while (es->s_last_orphan) {
1250 struct inode *inode;
1251
1252 if (!(inode =
1253 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1254 es->s_last_orphan = 0;
1255 break;
1256 }
1257
1258 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1259 DQUOT_INIT(inode);
1260 if (inode->i_nlink) {
1261 printk(KERN_DEBUG
1262 "%s: truncating inode %ld to %Ld bytes\n",
1263 __FUNCTION__, inode->i_ino, inode->i_size);
1264 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1265 inode->i_ino, inode->i_size);
1266 ext3_truncate(inode);
1267 nr_truncates++;
1268 } else {
1269 printk(KERN_DEBUG
1270 "%s: deleting unreferenced inode %ld\n",
1271 __FUNCTION__, inode->i_ino);
1272 jbd_debug(2, "deleting unreferenced inode %ld\n",
1273 inode->i_ino);
1274 nr_orphans++;
1275 }
1276 iput(inode); /* The delete magic happens here! */
1277 }
1278
1279#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1280
1281 if (nr_orphans)
1282 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1283 sb->s_id, PLURAL(nr_orphans));
1284 if (nr_truncates)
1285 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1286 sb->s_id, PLURAL(nr_truncates));
1287#ifdef CONFIG_QUOTA
1288 /* Turn quotas off */
1289 for (i = 0; i < MAXQUOTAS; i++) {
1290 if (sb_dqopt(sb)->files[i])
1291 vfs_quota_off(sb, i);
1292 }
1293#endif
1294 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1295}
1296
1297#define log2(n) ffz(~(n))
1298
1299/*
1300 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1301 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1302 * We need to be 1 filesystem block less than the 2^32 sector limit.
1303 */
1304static loff_t ext3_max_size(int bits)
1305{
1306 loff_t res = EXT3_NDIR_BLOCKS;
1307 /* This constant is calculated to be the largest file size for a
1308 * dense, 4k-blocksize file such that the total number of
1309 * sectors in the file, including data and all indirect blocks,
1310 * does not exceed 2^32. */
1311 const loff_t upper_limit = 0x1ff7fffd000LL;
1312
1313 res += 1LL << (bits-2);
1314 res += 1LL << (2*(bits-2));
1315 res += 1LL << (3*(bits-2));
1316 res <<= bits;
1317 if (res > upper_limit)
1318 res = upper_limit;
1319 return res;
1320}
1321
Mingming Cao43d23f92006-06-25 05:48:07 -07001322static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1323 ext3_fsblk_t logic_sb_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 int nr)
1325{
1326 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001327 unsigned long bg, first_meta_bg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 int has_super = 0;
1329
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1331
1332 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1333 nr < first_meta_bg)
1334 return (logic_sb_block + nr + 1);
1335 bg = sbi->s_desc_per_block * nr;
1336 if (ext3_bg_has_super(sb, bg))
1337 has_super = 1;
Mingming Cao43d23f92006-06-25 05:48:07 -07001338 return (has_super + ext3_group_first_block_no(sb, bg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339}
1340
1341
1342static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1343{
1344 struct buffer_head * bh;
1345 struct ext3_super_block *es = NULL;
1346 struct ext3_sb_info *sbi;
Mingming Cao43d23f92006-06-25 05:48:07 -07001347 ext3_fsblk_t block;
1348 ext3_fsblk_t sb_block = get_sb_block(&data);
1349 ext3_fsblk_t logic_sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 unsigned long offset = 0;
1351 unsigned long journal_inum = 0;
Johann Lombardi71b96252006-01-08 01:03:20 -08001352 unsigned long journal_devnum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 unsigned long def_mount_opts;
1354 struct inode *root;
1355 int blocksize;
1356 int hblock;
1357 int db_count;
1358 int i;
1359 int needs_recovery;
1360 __le32 features;
1361
1362 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1363 if (!sbi)
1364 return -ENOMEM;
1365 sb->s_fs_info = sbi;
1366 memset(sbi, 0, sizeof(*sbi));
1367 sbi->s_mount_opt = 0;
1368 sbi->s_resuid = EXT3_DEF_RESUID;
1369 sbi->s_resgid = EXT3_DEF_RESGID;
1370
1371 unlock_kernel();
1372
1373 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1374 if (!blocksize) {
1375 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1376 goto out_fail;
1377 }
1378
1379 /*
1380 * The ext3 superblock will not be buffer aligned for other than 1kB
1381 * block sizes. We need to calculate the offset from buffer start.
1382 */
1383 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1384 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1385 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1386 } else {
1387 logic_sb_block = sb_block;
1388 }
1389
1390 if (!(bh = sb_bread(sb, logic_sb_block))) {
1391 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1392 goto out_fail;
1393 }
1394 /*
1395 * Note: s_es must be initialized as soon as possible because
1396 * some ext3 macro-instructions depend on its value
1397 */
1398 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1399 sbi->s_es = es;
1400 sb->s_magic = le16_to_cpu(es->s_magic);
1401 if (sb->s_magic != EXT3_SUPER_MAGIC)
1402 goto cantfind_ext3;
1403
1404 /* Set defaults before we parse the mount options */
1405 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1406 if (def_mount_opts & EXT3_DEFM_DEBUG)
1407 set_opt(sbi->s_mount_opt, DEBUG);
1408 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1409 set_opt(sbi->s_mount_opt, GRPID);
1410 if (def_mount_opts & EXT3_DEFM_UID16)
1411 set_opt(sbi->s_mount_opt, NO_UID32);
1412 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1413 set_opt(sbi->s_mount_opt, XATTR_USER);
1414 if (def_mount_opts & EXT3_DEFM_ACL)
1415 set_opt(sbi->s_mount_opt, POSIX_ACL);
1416 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1417 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1418 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1419 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1420 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1421 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1422
1423 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1424 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1425 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1426 set_opt(sbi->s_mount_opt, ERRORS_RO);
1427
1428 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1429 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1430
1431 set_opt(sbi->s_mount_opt, RESERVATION);
1432
Johann Lombardi71b96252006-01-08 01:03:20 -08001433 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1434 NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 goto failed_mount;
1436
1437 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1438 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1439
1440 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1441 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1442 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1443 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1444 printk(KERN_WARNING
1445 "EXT3-fs warning: feature flags set on rev 0 fs, "
1446 "running e2fsck is recommended\n");
1447 /*
1448 * Check feature flags regardless of the revision level, since we
1449 * previously didn't change the revision level when setting the flags,
1450 * so there is a chance incompat flags are set on a rev 0 filesystem.
1451 */
1452 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1453 if (features) {
1454 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1455 "unsupported optional features (%x).\n",
1456 sb->s_id, le32_to_cpu(features));
1457 goto failed_mount;
1458 }
1459 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1460 if (!(sb->s_flags & MS_RDONLY) && features) {
1461 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1462 "unsupported optional features (%x).\n",
1463 sb->s_id, le32_to_cpu(features));
1464 goto failed_mount;
1465 }
1466 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1467
1468 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1469 blocksize > EXT3_MAX_BLOCK_SIZE) {
1470 printk(KERN_ERR
1471 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1472 blocksize, sb->s_id);
1473 goto failed_mount;
1474 }
1475
1476 hblock = bdev_hardsect_size(sb->s_bdev);
1477 if (sb->s_blocksize != blocksize) {
1478 /*
1479 * Make sure the blocksize for the filesystem is larger
1480 * than the hardware sectorsize for the machine.
1481 */
1482 if (blocksize < hblock) {
1483 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1484 "device blocksize %d.\n", blocksize, hblock);
1485 goto failed_mount;
1486 }
1487
1488 brelse (bh);
1489 sb_set_blocksize(sb, blocksize);
1490 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1491 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1492 bh = sb_bread(sb, logic_sb_block);
1493 if (!bh) {
1494 printk(KERN_ERR
1495 "EXT3-fs: Can't read superblock on 2nd try.\n");
1496 goto failed_mount;
1497 }
1498 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1499 sbi->s_es = es;
1500 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1501 printk (KERN_ERR
1502 "EXT3-fs: Magic mismatch, very weird !\n");
1503 goto failed_mount;
1504 }
1505 }
1506
1507 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1508
1509 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1510 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1511 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1512 } else {
1513 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1514 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1515 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1516 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1517 (sbi->s_inode_size > blocksize)) {
1518 printk (KERN_ERR
1519 "EXT3-fs: unsupported inode size: %d\n",
1520 sbi->s_inode_size);
1521 goto failed_mount;
1522 }
1523 }
1524 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1525 le32_to_cpu(es->s_log_frag_size);
1526 if (blocksize != sbi->s_frag_size) {
1527 printk(KERN_ERR
1528 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1529 sbi->s_frag_size, blocksize);
1530 goto failed_mount;
1531 }
1532 sbi->s_frags_per_block = 1;
1533 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1534 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1535 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1536 if (EXT3_INODE_SIZE(sb) == 0)
1537 goto cantfind_ext3;
1538 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1539 if (sbi->s_inodes_per_block == 0)
1540 goto cantfind_ext3;
1541 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1542 sbi->s_inodes_per_block;
1543 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1544 sbi->s_sbh = bh;
1545 sbi->s_mount_state = le16_to_cpu(es->s_state);
1546 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1547 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1548 for (i=0; i < 4; i++)
1549 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1550 sbi->s_def_hash_version = es->s_def_hash_version;
1551
1552 if (sbi->s_blocks_per_group > blocksize * 8) {
1553 printk (KERN_ERR
1554 "EXT3-fs: #blocks per group too big: %lu\n",
1555 sbi->s_blocks_per_group);
1556 goto failed_mount;
1557 }
1558 if (sbi->s_frags_per_group > blocksize * 8) {
1559 printk (KERN_ERR
1560 "EXT3-fs: #fragments per group too big: %lu\n",
1561 sbi->s_frags_per_group);
1562 goto failed_mount;
1563 }
1564 if (sbi->s_inodes_per_group > blocksize * 8) {
1565 printk (KERN_ERR
1566 "EXT3-fs: #inodes per group too big: %lu\n",
1567 sbi->s_inodes_per_group);
1568 goto failed_mount;
1569 }
1570
Mingming Caofcd5df32006-06-25 05:47:50 -07001571 if (le32_to_cpu(es->s_blocks_count) >
1572 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1573 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1574 " too large to mount safely\n", sb->s_id);
1575 if (sizeof(sector_t) < 8)
1576 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1577 "enabled\n");
1578 goto failed_mount;
1579 }
1580
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1582 goto cantfind_ext3;
1583 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1584 le32_to_cpu(es->s_first_data_block) +
1585 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1586 EXT3_BLOCKS_PER_GROUP(sb);
1587 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1588 EXT3_DESC_PER_BLOCK(sb);
1589 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1590 GFP_KERNEL);
1591 if (sbi->s_group_desc == NULL) {
1592 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1593 goto failed_mount;
1594 }
1595
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 bgl_lock_init(&sbi->s_blockgroup_lock);
1597
1598 for (i = 0; i < db_count; i++) {
1599 block = descriptor_loc(sb, logic_sb_block, i);
1600 sbi->s_group_desc[i] = sb_bread(sb, block);
1601 if (!sbi->s_group_desc[i]) {
1602 printk (KERN_ERR "EXT3-fs: "
1603 "can't read group descriptor %d\n", i);
1604 db_count = i;
1605 goto failed_mount2;
1606 }
1607 }
1608 if (!ext3_check_descriptors (sb)) {
Theodore Ts'od2e5b132006-06-25 05:47:52 -07001609 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 goto failed_mount2;
1611 }
1612 sbi->s_gdb_count = db_count;
1613 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1614 spin_lock_init(&sbi->s_next_gen_lock);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001615
1616 percpu_counter_init(&sbi->s_freeblocks_counter,
1617 ext3_count_free_blocks(sb));
1618 percpu_counter_init(&sbi->s_freeinodes_counter,
1619 ext3_count_free_inodes(sb));
1620 percpu_counter_init(&sbi->s_dirs_counter,
1621 ext3_count_dirs(sb));
1622
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 /* per fileystem reservation list head & lock */
1624 spin_lock_init(&sbi->s_rsv_window_lock);
1625 sbi->s_rsv_window_root = RB_ROOT;
1626 /* Add a single, static dummy reservation to the start of the
1627 * reservation window list --- it gives us a placeholder for
1628 * append-at-start-of-list which makes the allocation logic
1629 * _much_ simpler. */
1630 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1631 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1632 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1633 sbi->s_rsv_window_head.rsv_goal_size = 0;
1634 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1635
1636 /*
1637 * set up enough so that it can read an inode
1638 */
1639 sb->s_op = &ext3_sops;
1640 sb->s_export_op = &ext3_export_ops;
1641 sb->s_xattr = ext3_xattr_handlers;
1642#ifdef CONFIG_QUOTA
1643 sb->s_qcop = &ext3_qctl_operations;
1644 sb->dq_op = &ext3_quota_operations;
1645#endif
1646 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1647
1648 sb->s_root = NULL;
1649
1650 needs_recovery = (es->s_last_orphan != 0 ||
1651 EXT3_HAS_INCOMPAT_FEATURE(sb,
1652 EXT3_FEATURE_INCOMPAT_RECOVER));
1653
1654 /*
1655 * The first inode we look at is the journal inode. Don't try
1656 * root first: it may be modified in the journal!
1657 */
1658 if (!test_opt(sb, NOLOAD) &&
1659 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
Johann Lombardi71b96252006-01-08 01:03:20 -08001660 if (ext3_load_journal(sb, es, journal_devnum))
Mingming Cao0216bfc2006-06-23 02:05:41 -07001661 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 } else if (journal_inum) {
1663 if (ext3_create_journal(sb, es, journal_inum))
Mingming Cao0216bfc2006-06-23 02:05:41 -07001664 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 } else {
1666 if (!silent)
1667 printk (KERN_ERR
1668 "ext3: No journal on filesystem on %s\n",
1669 sb->s_id);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001670 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 }
1672
1673 /* We have now updated the journal if required, so we can
1674 * validate the data journaling mode. */
1675 switch (test_opt(sb, DATA_FLAGS)) {
1676 case 0:
1677 /* No mode set, assume a default based on the journal
1678 capabilities: ORDERED_DATA if the journal can
1679 cope, else JOURNAL_DATA */
1680 if (journal_check_available_features
1681 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1682 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1683 else
1684 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1685 break;
1686
1687 case EXT3_MOUNT_ORDERED_DATA:
1688 case EXT3_MOUNT_WRITEBACK_DATA:
1689 if (!journal_check_available_features
1690 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1691 printk(KERN_ERR "EXT3-fs: Journal does not support "
1692 "requested data journaling mode\n");
Mingming Cao0216bfc2006-06-23 02:05:41 -07001693 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 }
1695 default:
1696 break;
1697 }
1698
1699 if (test_opt(sb, NOBH)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1701 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1702 "its supported only with writeback mode\n");
1703 clear_opt(sbi->s_mount_opt, NOBH);
1704 }
1705 }
1706 /*
1707 * The journal_load will have done any necessary log recovery,
1708 * so we can safely mount the rest of the filesystem now.
1709 */
1710
1711 root = iget(sb, EXT3_ROOT_INO);
1712 sb->s_root = d_alloc_root(root);
1713 if (!sb->s_root) {
1714 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1715 iput(root);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001716 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 }
1718 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1719 dput(sb->s_root);
1720 sb->s_root = NULL;
1721 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
Mingming Cao0216bfc2006-06-23 02:05:41 -07001722 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 }
1724
1725 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1726 /*
1727 * akpm: core read_super() calls in here with the superblock locked.
1728 * That deadlocks, because orphan cleanup needs to lock the superblock
1729 * in numerous places. Here we just pop the lock - it's relatively
1730 * harmless, because we are now ready to accept write_super() requests,
1731 * and aviro says that's the only reason for hanging onto the
1732 * superblock lock.
1733 */
1734 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1735 ext3_orphan_cleanup(sb, es);
1736 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1737 if (needs_recovery)
1738 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1739 ext3_mark_recovery_complete(sb, es);
1740 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1741 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1742 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1743 "writeback");
1744
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 lock_kernel();
1746 return 0;
1747
1748cantfind_ext3:
1749 if (!silent)
1750 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1751 sb->s_id);
1752 goto failed_mount;
1753
Mingming Cao0216bfc2006-06-23 02:05:41 -07001754failed_mount4:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 journal_destroy(sbi->s_journal);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001756failed_mount3:
1757 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1758 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1759 percpu_counter_destroy(&sbi->s_dirs_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760failed_mount2:
1761 for (i = 0; i < db_count; i++)
1762 brelse(sbi->s_group_desc[i]);
1763 kfree(sbi->s_group_desc);
1764failed_mount:
1765#ifdef CONFIG_QUOTA
1766 for (i = 0; i < MAXQUOTAS; i++)
1767 kfree(sbi->s_qf_names[i]);
1768#endif
1769 ext3_blkdev_remove(sbi);
1770 brelse(bh);
1771out_fail:
1772 sb->s_fs_info = NULL;
1773 kfree(sbi);
1774 lock_kernel();
1775 return -EINVAL;
1776}
1777
1778/*
1779 * Setup any per-fs journal parameters now. We'll do this both on
1780 * initial mount, once the journal has been initialised but before we've
1781 * done any recovery; and again on any subsequent remount.
1782 */
1783static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1784{
1785 struct ext3_sb_info *sbi = EXT3_SB(sb);
1786
1787 if (sbi->s_commit_interval)
1788 journal->j_commit_interval = sbi->s_commit_interval;
1789 /* We could also set up an ext3-specific default for the commit
1790 * interval here, but for now we'll just fall back to the jbd
1791 * default. */
1792
1793 spin_lock(&journal->j_state_lock);
1794 if (test_opt(sb, BARRIER))
1795 journal->j_flags |= JFS_BARRIER;
1796 else
1797 journal->j_flags &= ~JFS_BARRIER;
1798 spin_unlock(&journal->j_state_lock);
1799}
1800
1801static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1802{
1803 struct inode *journal_inode;
1804 journal_t *journal;
1805
1806 /* First, test for the existence of a valid inode on disk. Bad
1807 * things happen if we iget() an unused inode, as the subsequent
1808 * iput() will try to delete it. */
1809
1810 journal_inode = iget(sb, journal_inum);
1811 if (!journal_inode) {
1812 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1813 return NULL;
1814 }
1815 if (!journal_inode->i_nlink) {
1816 make_bad_inode(journal_inode);
1817 iput(journal_inode);
1818 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1819 return NULL;
1820 }
1821
1822 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1823 journal_inode, journal_inode->i_size);
1824 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1825 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1826 iput(journal_inode);
1827 return NULL;
1828 }
1829
1830 journal = journal_init_inode(journal_inode);
1831 if (!journal) {
1832 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1833 iput(journal_inode);
1834 return NULL;
1835 }
1836 journal->j_private = sb;
1837 ext3_init_journal_params(sb, journal);
1838 return journal;
1839}
1840
1841static journal_t *ext3_get_dev_journal(struct super_block *sb,
1842 dev_t j_dev)
1843{
1844 struct buffer_head * bh;
1845 journal_t *journal;
Mingming Cao43d23f92006-06-25 05:48:07 -07001846 ext3_fsblk_t start;
Mingming Cao1c2bf372006-06-25 05:48:06 -07001847 ext3_fsblk_t len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 int hblock, blocksize;
Mingming Cao43d23f92006-06-25 05:48:07 -07001849 ext3_fsblk_t sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 unsigned long offset;
1851 struct ext3_super_block * es;
1852 struct block_device *bdev;
1853
1854 bdev = ext3_blkdev_get(j_dev);
1855 if (bdev == NULL)
1856 return NULL;
1857
1858 if (bd_claim(bdev, sb)) {
1859 printk(KERN_ERR
1860 "EXT3: failed to claim external journal device.\n");
1861 blkdev_put(bdev);
1862 return NULL;
1863 }
1864
1865 blocksize = sb->s_blocksize;
1866 hblock = bdev_hardsect_size(bdev);
1867 if (blocksize < hblock) {
1868 printk(KERN_ERR
1869 "EXT3-fs: blocksize too small for journal device.\n");
1870 goto out_bdev;
1871 }
1872
1873 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1874 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1875 set_blocksize(bdev, blocksize);
1876 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1877 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1878 "external journal\n");
1879 goto out_bdev;
1880 }
1881
1882 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1883 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1884 !(le32_to_cpu(es->s_feature_incompat) &
1885 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1886 printk(KERN_ERR "EXT3-fs: external journal has "
1887 "bad superblock\n");
1888 brelse(bh);
1889 goto out_bdev;
1890 }
1891
1892 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1893 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1894 brelse(bh);
1895 goto out_bdev;
1896 }
1897
1898 len = le32_to_cpu(es->s_blocks_count);
1899 start = sb_block + 1;
1900 brelse(bh); /* we're done with the superblock */
1901
1902 journal = journal_init_dev(bdev, sb->s_bdev,
1903 start, len, blocksize);
1904 if (!journal) {
1905 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1906 goto out_bdev;
1907 }
1908 journal->j_private = sb;
1909 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1910 wait_on_buffer(journal->j_sb_buffer);
1911 if (!buffer_uptodate(journal->j_sb_buffer)) {
1912 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1913 goto out_journal;
1914 }
1915 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1916 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1917 "user (unsupported) - %d\n",
1918 be32_to_cpu(journal->j_superblock->s_nr_users));
1919 goto out_journal;
1920 }
1921 EXT3_SB(sb)->journal_bdev = bdev;
1922 ext3_init_journal_params(sb, journal);
1923 return journal;
1924out_journal:
1925 journal_destroy(journal);
1926out_bdev:
1927 ext3_blkdev_put(bdev);
1928 return NULL;
1929}
1930
Johann Lombardi71b96252006-01-08 01:03:20 -08001931static int ext3_load_journal(struct super_block *sb,
1932 struct ext3_super_block *es,
1933 unsigned long journal_devnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934{
1935 journal_t *journal;
1936 int journal_inum = le32_to_cpu(es->s_journal_inum);
Johann Lombardi71b96252006-01-08 01:03:20 -08001937 dev_t journal_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 int err = 0;
1939 int really_read_only;
1940
Johann Lombardi71b96252006-01-08 01:03:20 -08001941 if (journal_devnum &&
1942 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1943 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1944 "numbers have changed\n");
1945 journal_dev = new_decode_dev(journal_devnum);
1946 } else
1947 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1948
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 really_read_only = bdev_read_only(sb->s_bdev);
1950
1951 /*
1952 * Are we loading a blank journal or performing recovery after a
1953 * crash? For recovery, we need to check in advance whether we
1954 * can get read-write access to the device.
1955 */
1956
1957 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1958 if (sb->s_flags & MS_RDONLY) {
1959 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1960 "required on readonly filesystem.\n");
1961 if (really_read_only) {
1962 printk(KERN_ERR "EXT3-fs: write access "
1963 "unavailable, cannot proceed.\n");
1964 return -EROFS;
1965 }
1966 printk (KERN_INFO "EXT3-fs: write access will "
1967 "be enabled during recovery.\n");
1968 }
1969 }
1970
1971 if (journal_inum && journal_dev) {
1972 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1973 "and inode journals!\n");
1974 return -EINVAL;
1975 }
1976
1977 if (journal_inum) {
1978 if (!(journal = ext3_get_journal(sb, journal_inum)))
1979 return -EINVAL;
1980 } else {
1981 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1982 return -EINVAL;
1983 }
1984
1985 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1986 err = journal_update_format(journal);
1987 if (err) {
1988 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1989 journal_destroy(journal);
1990 return err;
1991 }
1992 }
1993
1994 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1995 err = journal_wipe(journal, !really_read_only);
1996 if (!err)
1997 err = journal_load(journal);
1998
1999 if (err) {
2000 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2001 journal_destroy(journal);
2002 return err;
2003 }
2004
2005 EXT3_SB(sb)->s_journal = journal;
2006 ext3_clear_journal_err(sb, es);
Johann Lombardi71b96252006-01-08 01:03:20 -08002007
2008 if (journal_devnum &&
2009 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2010 es->s_journal_dev = cpu_to_le32(journal_devnum);
2011 sb->s_dirt = 1;
2012
2013 /* Make sure we flush the recovery flag to disk. */
2014 ext3_commit_super(sb, es, 1);
2015 }
2016
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 return 0;
2018}
2019
2020static int ext3_create_journal(struct super_block * sb,
2021 struct ext3_super_block * es,
2022 int journal_inum)
2023{
2024 journal_t *journal;
2025
2026 if (sb->s_flags & MS_RDONLY) {
2027 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2028 "create journal.\n");
2029 return -EROFS;
2030 }
2031
2032 if (!(journal = ext3_get_journal(sb, journal_inum)))
2033 return -EINVAL;
2034
2035 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2036 journal_inum);
2037
2038 if (journal_create(journal)) {
2039 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2040 journal_destroy(journal);
2041 return -EIO;
2042 }
2043
2044 EXT3_SB(sb)->s_journal = journal;
2045
2046 ext3_update_dynamic_rev(sb);
2047 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2048 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2049
2050 es->s_journal_inum = cpu_to_le32(journal_inum);
2051 sb->s_dirt = 1;
2052
2053 /* Make sure we flush the recovery flag to disk. */
2054 ext3_commit_super(sb, es, 1);
2055
2056 return 0;
2057}
2058
2059static void ext3_commit_super (struct super_block * sb,
2060 struct ext3_super_block * es,
2061 int sync)
2062{
2063 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2064
2065 if (!sbh)
2066 return;
2067 es->s_wtime = cpu_to_le32(get_seconds());
2068 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2069 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2070 BUFFER_TRACE(sbh, "marking dirty");
2071 mark_buffer_dirty(sbh);
2072 if (sync)
2073 sync_dirty_buffer(sbh);
2074}
2075
2076
2077/*
2078 * Have we just finished recovery? If so, and if we are mounting (or
2079 * remounting) the filesystem readonly, then we will end up with a
2080 * consistent fs on disk. Record that fact.
2081 */
2082static void ext3_mark_recovery_complete(struct super_block * sb,
2083 struct ext3_super_block * es)
2084{
2085 journal_t *journal = EXT3_SB(sb)->s_journal;
2086
2087 journal_lock_updates(journal);
2088 journal_flush(journal);
2089 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2090 sb->s_flags & MS_RDONLY) {
2091 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2092 sb->s_dirt = 0;
2093 ext3_commit_super(sb, es, 1);
2094 }
2095 journal_unlock_updates(journal);
2096}
2097
2098/*
2099 * If we are mounting (or read-write remounting) a filesystem whose journal
2100 * has recorded an error from a previous lifetime, move that error to the
2101 * main filesystem now.
2102 */
2103static void ext3_clear_journal_err(struct super_block * sb,
2104 struct ext3_super_block * es)
2105{
2106 journal_t *journal;
2107 int j_errno;
2108 const char *errstr;
2109
2110 journal = EXT3_SB(sb)->s_journal;
2111
2112 /*
2113 * Now check for any error status which may have been recorded in the
2114 * journal by a prior ext3_error() or ext3_abort()
2115 */
2116
2117 j_errno = journal_errno(journal);
2118 if (j_errno) {
2119 char nbuf[16];
2120
2121 errstr = ext3_decode_error(sb, j_errno, nbuf);
2122 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2123 "from previous mount: %s", errstr);
2124 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2125 "filesystem check.");
2126
2127 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2128 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2129 ext3_commit_super (sb, es, 1);
2130
2131 journal_clear_err(journal);
2132 }
2133}
2134
2135/*
2136 * Force the running and committing transactions to commit,
2137 * and wait on the commit.
2138 */
2139int ext3_force_commit(struct super_block *sb)
2140{
2141 journal_t *journal;
2142 int ret;
2143
2144 if (sb->s_flags & MS_RDONLY)
2145 return 0;
2146
2147 journal = EXT3_SB(sb)->s_journal;
2148 sb->s_dirt = 0;
2149 ret = ext3_journal_force_commit(journal);
2150 return ret;
2151}
2152
2153/*
2154 * Ext3 always journals updates to the superblock itself, so we don't
2155 * have to propagate any other updates to the superblock on disk at this
2156 * point. Just start an async writeback to get the buffers on their way
2157 * to the disk.
2158 *
2159 * This implicitly triggers the writebehind on sync().
2160 */
2161
2162static void ext3_write_super (struct super_block * sb)
2163{
Ingo Molnar7892f2f2006-01-09 15:59:25 -08002164 if (mutex_trylock(&sb->s_lock) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165 BUG();
2166 sb->s_dirt = 0;
2167}
2168
2169static int ext3_sync_fs(struct super_block *sb, int wait)
2170{
2171 tid_t target;
2172
2173 sb->s_dirt = 0;
2174 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2175 if (wait)
2176 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2177 }
2178 return 0;
2179}
2180
2181/*
2182 * LVM calls this function before a (read-only) snapshot is created. This
2183 * gives us a chance to flush the journal completely and mark the fs clean.
2184 */
2185static void ext3_write_super_lockfs(struct super_block *sb)
2186{
2187 sb->s_dirt = 0;
2188
2189 if (!(sb->s_flags & MS_RDONLY)) {
2190 journal_t *journal = EXT3_SB(sb)->s_journal;
2191
2192 /* Now we set up the journal barrier. */
2193 journal_lock_updates(journal);
2194 journal_flush(journal);
2195
2196 /* Journal blocked and flushed, clear needs_recovery flag. */
2197 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2198 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2199 }
2200}
2201
2202/*
2203 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2204 * flag here, even though the filesystem is not technically dirty yet.
2205 */
2206static void ext3_unlockfs(struct super_block *sb)
2207{
2208 if (!(sb->s_flags & MS_RDONLY)) {
2209 lock_super(sb);
2210 /* Reser the needs_recovery flag before the fs is unlocked. */
2211 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2212 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2213 unlock_super(sb);
2214 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2215 }
2216}
2217
2218static int ext3_remount (struct super_block * sb, int * flags, char * data)
2219{
2220 struct ext3_super_block * es;
2221 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07002222 ext3_fsblk_t n_blocks_count = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002223 unsigned long old_sb_flags;
2224 struct ext3_mount_options old_opts;
2225 int err;
2226#ifdef CONFIG_QUOTA
2227 int i;
2228#endif
2229
2230 /* Store the original options */
2231 old_sb_flags = sb->s_flags;
2232 old_opts.s_mount_opt = sbi->s_mount_opt;
2233 old_opts.s_resuid = sbi->s_resuid;
2234 old_opts.s_resgid = sbi->s_resgid;
2235 old_opts.s_commit_interval = sbi->s_commit_interval;
2236#ifdef CONFIG_QUOTA
2237 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2238 for (i = 0; i < MAXQUOTAS; i++)
2239 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2240#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002241
2242 /*
2243 * Allow the "check" option to be passed as a remount option.
2244 */
Johann Lombardi71b96252006-01-08 01:03:20 -08002245 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002246 err = -EINVAL;
2247 goto restore_opts;
2248 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249
2250 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2251 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2252
2253 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2254 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2255
2256 es = sbi->s_es;
2257
2258 ext3_init_journal_params(sb, sbi->s_journal);
2259
2260 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2261 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002262 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2263 err = -EROFS;
2264 goto restore_opts;
2265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266
2267 if (*flags & MS_RDONLY) {
2268 /*
2269 * First of all, the unconditional stuff we have to do
2270 * to disable replay of the journal when we next remount
2271 */
2272 sb->s_flags |= MS_RDONLY;
2273
2274 /*
2275 * OK, test if we are remounting a valid rw partition
2276 * readonly, and if so set the rdonly flag and then
2277 * mark the partition as valid again.
2278 */
2279 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2280 (sbi->s_mount_state & EXT3_VALID_FS))
2281 es->s_state = cpu_to_le16(sbi->s_mount_state);
2282
2283 ext3_mark_recovery_complete(sb, es);
2284 } else {
2285 __le32 ret;
2286 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2287 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2288 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2289 "remount RDWR because of unsupported "
2290 "optional features (%x).\n",
2291 sb->s_id, le32_to_cpu(ret));
Jan Kara08c6a962005-07-12 13:58:28 -07002292 err = -EROFS;
2293 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 }
2295 /*
2296 * Mounting a RDONLY partition read-write, so reread
2297 * and store the current valid flag. (It may have
2298 * been changed by e2fsck since we originally mounted
2299 * the partition.)
2300 */
2301 ext3_clear_journal_err(sb, es);
2302 sbi->s_mount_state = le16_to_cpu(es->s_state);
Jan Kara08c6a962005-07-12 13:58:28 -07002303 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2304 err = ret;
2305 goto restore_opts;
2306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 if (!ext3_setup_super (sb, es, 0))
2308 sb->s_flags &= ~MS_RDONLY;
2309 }
2310 }
Jan Kara08c6a962005-07-12 13:58:28 -07002311#ifdef CONFIG_QUOTA
2312 /* Release old quota file names */
2313 for (i = 0; i < MAXQUOTAS; i++)
2314 if (old_opts.s_qf_names[i] &&
2315 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2316 kfree(old_opts.s_qf_names[i]);
2317#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 return 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002319restore_opts:
2320 sb->s_flags = old_sb_flags;
2321 sbi->s_mount_opt = old_opts.s_mount_opt;
2322 sbi->s_resuid = old_opts.s_resuid;
2323 sbi->s_resgid = old_opts.s_resgid;
2324 sbi->s_commit_interval = old_opts.s_commit_interval;
2325#ifdef CONFIG_QUOTA
2326 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2327 for (i = 0; i < MAXQUOTAS; i++) {
2328 if (sbi->s_qf_names[i] &&
2329 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2330 kfree(sbi->s_qf_names[i]);
2331 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2332 }
2333#endif
2334 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335}
2336
David Howells726c3342006-06-23 02:02:58 -07002337static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338{
David Howells726c3342006-06-23 02:02:58 -07002339 struct super_block *sb = dentry->d_sb;
Alex Tomas09fe3162006-03-24 03:16:16 -08002340 struct ext3_sb_info *sbi = EXT3_SB(sb);
2341 struct ext3_super_block *es = sbi->s_es;
Mingming Cao43d23f92006-06-25 05:48:07 -07002342 ext3_fsblk_t overhead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 int i;
2344
2345 if (test_opt (sb, MINIX_DF))
2346 overhead = 0;
2347 else {
2348 unsigned long ngroups;
2349 ngroups = EXT3_SB(sb)->s_groups_count;
2350 smp_rmb();
2351
2352 /*
2353 * Compute the overhead (FS structures)
2354 */
2355
2356 /*
2357 * All of the blocks before first_data_block are
2358 * overhead
2359 */
2360 overhead = le32_to_cpu(es->s_first_data_block);
2361
2362 /*
2363 * Add the overhead attributed to the superblock and
2364 * block group descriptors. If the sparse superblocks
2365 * feature is turned on, then not all groups have this.
2366 */
2367 for (i = 0; i < ngroups; i++) {
2368 overhead += ext3_bg_has_super(sb, i) +
2369 ext3_bg_num_gdb(sb, i);
2370 cond_resched();
2371 }
2372
2373 /*
2374 * Every block group has an inode bitmap, a block
2375 * bitmap, and an inode table.
2376 */
2377 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2378 }
2379
2380 buf->f_type = EXT3_SUPER_MAGIC;
2381 buf->f_bsize = sb->s_blocksize;
2382 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
Alex Tomas09fe3162006-03-24 03:16:16 -08002383 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2385 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2386 buf->f_bavail = 0;
2387 buf->f_files = le32_to_cpu(es->s_inodes_count);
Alex Tomas09fe3162006-03-24 03:16:16 -08002388 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389 buf->f_namelen = EXT3_NAME_LEN;
2390 return 0;
2391}
2392
2393/* Helper function for writing quotas on sync - we need to start transaction before quota file
2394 * is locked for write. Otherwise the are possible deadlocks:
2395 * Process 1 Process 2
2396 * ext3_create() quota_sync()
2397 * journal_start() write_dquot()
Ingo Molnard3be9152006-03-23 03:00:29 -08002398 * DQUOT_INIT() down(dqio_mutex)
2399 * down(dqio_mutex) journal_start()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400 *
2401 */
2402
2403#ifdef CONFIG_QUOTA
2404
2405static inline struct inode *dquot_to_inode(struct dquot *dquot)
2406{
2407 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2408}
2409
2410static int ext3_dquot_initialize(struct inode *inode, int type)
2411{
2412 handle_t *handle;
2413 int ret, err;
2414
2415 /* We may create quota structure so we need to reserve enough blocks */
Jan Kara1f545872005-06-23 22:01:04 -07002416 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417 if (IS_ERR(handle))
2418 return PTR_ERR(handle);
2419 ret = dquot_initialize(inode, type);
2420 err = ext3_journal_stop(handle);
2421 if (!ret)
2422 ret = err;
2423 return ret;
2424}
2425
2426static int ext3_dquot_drop(struct inode *inode)
2427{
2428 handle_t *handle;
2429 int ret, err;
2430
2431 /* We may delete quota structure so we need to reserve enough blocks */
Jan Kara1f545872005-06-23 22:01:04 -07002432 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 if (IS_ERR(handle))
2434 return PTR_ERR(handle);
2435 ret = dquot_drop(inode);
2436 err = ext3_journal_stop(handle);
2437 if (!ret)
2438 ret = err;
2439 return ret;
2440}
2441
2442static int ext3_write_dquot(struct dquot *dquot)
2443{
2444 int ret, err;
2445 handle_t *handle;
2446 struct inode *inode;
2447
2448 inode = dquot_to_inode(dquot);
2449 handle = ext3_journal_start(inode,
Jan Kara1f545872005-06-23 22:01:04 -07002450 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451 if (IS_ERR(handle))
2452 return PTR_ERR(handle);
2453 ret = dquot_commit(dquot);
2454 err = ext3_journal_stop(handle);
2455 if (!ret)
2456 ret = err;
2457 return ret;
2458}
2459
2460static int ext3_acquire_dquot(struct dquot *dquot)
2461{
2462 int ret, err;
2463 handle_t *handle;
2464
2465 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002466 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 if (IS_ERR(handle))
2468 return PTR_ERR(handle);
2469 ret = dquot_acquire(dquot);
2470 err = ext3_journal_stop(handle);
2471 if (!ret)
2472 ret = err;
2473 return ret;
2474}
2475
2476static int ext3_release_dquot(struct dquot *dquot)
2477{
2478 int ret, err;
2479 handle_t *handle;
2480
2481 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002482 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483 if (IS_ERR(handle))
2484 return PTR_ERR(handle);
2485 ret = dquot_release(dquot);
2486 err = ext3_journal_stop(handle);
2487 if (!ret)
2488 ret = err;
2489 return ret;
2490}
2491
2492static int ext3_mark_dquot_dirty(struct dquot *dquot)
2493{
2494 /* Are we journalling quotas? */
2495 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2496 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2497 dquot_mark_dquot_dirty(dquot);
2498 return ext3_write_dquot(dquot);
2499 } else {
2500 return dquot_mark_dquot_dirty(dquot);
2501 }
2502}
2503
2504static int ext3_write_info(struct super_block *sb, int type)
2505{
2506 int ret, err;
2507 handle_t *handle;
2508
2509 /* Data block + inode block */
2510 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2511 if (IS_ERR(handle))
2512 return PTR_ERR(handle);
2513 ret = dquot_commit_info(sb, type);
2514 err = ext3_journal_stop(handle);
2515 if (!ret)
2516 ret = err;
2517 return ret;
2518}
2519
2520/*
2521 * Turn on quotas during mount time - we need to find
2522 * the quota file and such...
2523 */
2524static int ext3_quota_on_mount(struct super_block *sb, int type)
2525{
Christoph Hellwig84de8562005-06-23 00:09:16 -07002526 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2527 EXT3_SB(sb)->s_jquota_fmt, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528}
2529
2530/*
2531 * Standard function to be called on quota_on
2532 */
2533static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2534 char *path)
2535{
2536 int err;
2537 struct nameidata nd;
2538
Jan Kara1f545872005-06-23 22:01:04 -07002539 if (!test_opt(sb, QUOTA))
2540 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002541 /* Not journalling quota? */
2542 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2543 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2544 return vfs_quota_on(sb, type, format_id, path);
2545 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2546 if (err)
2547 return err;
2548 /* Quotafile not on the same filesystem? */
2549 if (nd.mnt->mnt_sb != sb) {
2550 path_release(&nd);
2551 return -EXDEV;
2552 }
2553 /* Quotafile not of fs root? */
2554 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2555 printk(KERN_WARNING
2556 "EXT3-fs: Quota file not on filesystem root. "
2557 "Journalled quota will not work.\n");
2558 path_release(&nd);
2559 return vfs_quota_on(sb, type, format_id, path);
2560}
2561
2562/* Read data from quotafile - avoid pagecache and such because we cannot afford
2563 * acquiring the locks... As quota files are never truncated and quota code
2564 * itself serializes the operations (and noone else should touch the files)
2565 * we don't have to be afraid of races */
2566static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2567 size_t len, loff_t off)
2568{
2569 struct inode *inode = sb_dqopt(sb)->files[type];
2570 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2571 int err = 0;
2572 int offset = off & (sb->s_blocksize - 1);
2573 int tocopy;
2574 size_t toread;
2575 struct buffer_head *bh;
2576 loff_t i_size = i_size_read(inode);
2577
2578 if (off > i_size)
2579 return 0;
2580 if (off+len > i_size)
2581 len = i_size-off;
2582 toread = len;
2583 while (toread > 0) {
2584 tocopy = sb->s_blocksize - offset < toread ?
2585 sb->s_blocksize - offset : toread;
2586 bh = ext3_bread(NULL, inode, blk, 0, &err);
2587 if (err)
2588 return err;
2589 if (!bh) /* A hole? */
2590 memset(data, 0, tocopy);
2591 else
2592 memcpy(data, bh->b_data+offset, tocopy);
2593 brelse(bh);
2594 offset = 0;
2595 toread -= tocopy;
2596 data += tocopy;
2597 blk++;
2598 }
2599 return len;
2600}
2601
2602/* Write to quotafile (we know the transaction is already started and has
2603 * enough credits) */
2604static ssize_t ext3_quota_write(struct super_block *sb, int type,
2605 const char *data, size_t len, loff_t off)
2606{
2607 struct inode *inode = sb_dqopt(sb)->files[type];
2608 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2609 int err = 0;
2610 int offset = off & (sb->s_blocksize - 1);
2611 int tocopy;
2612 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2613 size_t towrite = len;
2614 struct buffer_head *bh;
2615 handle_t *handle = journal_current_handle();
2616
Arjan van de Ven5c81a412006-07-03 00:25:20 -07002617 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618 while (towrite > 0) {
2619 tocopy = sb->s_blocksize - offset < towrite ?
2620 sb->s_blocksize - offset : towrite;
2621 bh = ext3_bread(handle, inode, blk, 1, &err);
2622 if (!bh)
2623 goto out;
2624 if (journal_quota) {
2625 err = ext3_journal_get_write_access(handle, bh);
2626 if (err) {
2627 brelse(bh);
2628 goto out;
2629 }
2630 }
2631 lock_buffer(bh);
2632 memcpy(bh->b_data+offset, data, tocopy);
2633 flush_dcache_page(bh->b_page);
2634 unlock_buffer(bh);
2635 if (journal_quota)
2636 err = ext3_journal_dirty_metadata(handle, bh);
2637 else {
2638 /* Always do at least ordered writes for quotas */
2639 err = ext3_journal_dirty_data(handle, bh);
2640 mark_buffer_dirty(bh);
2641 }
2642 brelse(bh);
2643 if (err)
2644 goto out;
2645 offset = 0;
2646 towrite -= tocopy;
2647 data += tocopy;
2648 blk++;
2649 }
2650out:
2651 if (len == towrite)
2652 return err;
2653 if (inode->i_size < off+len-towrite) {
2654 i_size_write(inode, off+len-towrite);
2655 EXT3_I(inode)->i_disksize = inode->i_size;
2656 }
2657 inode->i_version++;
2658 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2659 ext3_mark_inode_dirty(handle, inode);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002660 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 return len - towrite;
2662}
2663
2664#endif
2665
David Howells454e2392006-06-23 02:02:57 -07002666static int ext3_get_sb(struct file_system_type *fs_type,
2667 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668{
David Howells454e2392006-06-23 02:02:57 -07002669 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670}
2671
2672static struct file_system_type ext3_fs_type = {
2673 .owner = THIS_MODULE,
2674 .name = "ext3",
2675 .get_sb = ext3_get_sb,
2676 .kill_sb = kill_block_super,
2677 .fs_flags = FS_REQUIRES_DEV,
2678};
2679
2680static int __init init_ext3_fs(void)
2681{
2682 int err = init_ext3_xattr();
2683 if (err)
2684 return err;
2685 err = init_inodecache();
2686 if (err)
2687 goto out1;
2688 err = register_filesystem(&ext3_fs_type);
2689 if (err)
2690 goto out;
2691 return 0;
2692out:
2693 destroy_inodecache();
2694out1:
2695 exit_ext3_xattr();
2696 return err;
2697}
2698
2699static void __exit exit_ext3_fs(void)
2700{
2701 unregister_filesystem(&ext3_fs_type);
2702 destroy_inodecache();
2703 exit_ext3_xattr();
2704}
2705
2706MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2707MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2708MODULE_LICENSE("GPL");
2709module_init(init_ext3_fs)
2710module_exit(exit_ext3_fs)