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fs: Limit sys_mount to only request filesystem modules.
[mirror_ubuntu-zesty-kernel.git] / fs / ext3 / super.c
CommitLineData
1da177e4
LT		 1/*
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
1da177e4 19#include <linux/module.h>
1da177e4
LT		 20#include <linux/blkdev.h>
21#include <linux/parser.h>
a5694255 22#include <linux/exportfs.h>
4613ad18 23#include <linux/statfs.h>
1da177e4
LT		 24#include <linux/random.h>
25#include <linux/mount.h>
1da177e4 26#include <linux/quotaops.h>
8fc2751b 27#include <linux/seq_file.h>
3fc74269 28#include <linux/log2.h>
d71bc6db 29#include <linux/cleancache.h>
381be254 30
1da177e4 31#include <asm/uaccess.h>
381be254 32
4613ad18
AV		 33#define CREATE_TRACE_POINTS
34
35#include "ext3.h"
1da177e4
LT		 36#include "xattr.h"
37#include "acl.h"
381be254 38#include "namei.h"
1da177e4 39
bbae8bcc
LT		 40#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
41 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
42#else
43 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
44#endif
45
71b96257
JL		 46static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
1da177e4 48static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 49 unsigned int);
c4be0c1d
TS		 50static int ext3_commit_super(struct super_block *sb,
51 struct ext3_super_block *es,
1da177e4
LT		 52 int sync);
53static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57static int ext3_sync_fs(struct super_block *sb, int wait);
58static const char *ext3_decode_error(struct super_block * sb, int errno,
59 char nbuf[16]);
60static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 61static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 62static int ext3_unfreeze(struct super_block *sb);
c4be0c1d 63static int ext3_freeze(struct super_block *sb);
1da177e4 64
ae6ddcc5 65/*
1da177e4 66 * Wrappers for journal_start/end.
1da177e4
LT		 67 */
68handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
69{
70 journal_t *journal;
71
72 if (sb->s_flags & MS_RDONLY)
73 return ERR_PTR(-EROFS);
74
75 /* Special case here: if the journal has aborted behind our
76 * backs (eg. EIO in the commit thread), then we still need to
77 * take the FS itself readonly cleanly. */
78 journal = EXT3_SB(sb)->s_journal;
79 if (is_journal_aborted(journal)) {
e05b6b52 80 ext3_abort(sb, __func__,
1da177e4
LT		 81 "Detected aborted journal");
82 return ERR_PTR(-EROFS);
83 }
84
85 return journal_start(journal, nblocks);
86}
87
1da177e4
LT		 88int __ext3_journal_stop(const char *where, handle_t *handle)
89{
90 struct super_block *sb;
91 int err;
92 int rc;
93
94 sb = handle->h_transaction->t_journal->j_private;
95 err = handle->h_err;
96 rc = journal_stop(handle);
97
98 if (!err)
99 err = rc;
100 if (err)
101 __ext3_std_error(sb, where, err);
102 return err;
103}
104
105void ext3_journal_abort_handle(const char *caller, const char *err_fn,
106 struct buffer_head *bh, handle_t *handle, int err)
107{
108 char nbuf[16];
109 const char *errstr = ext3_decode_error(NULL, err, nbuf);
110
111 if (bh)
112 BUFFER_TRACE(bh, "abort");
113
114 if (!handle->h_err)
115 handle->h_err = err;
116
117 if (is_handle_aborted(handle))
118 return;
119
4cf46b67
AF		 120 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
121 caller, errstr, err_fn);
1da177e4
LT		 122
123 journal_abort_handle(handle);
124}
125
4cf46b67
AF		 126void ext3_msg(struct super_block *sb, const char *prefix,
127 const char *fmt, ...)
128{
99fbb1e2 129 struct va_format vaf;
4cf46b67
AF		 130 va_list args;
131
132 va_start(args, fmt);
99fbb1e2
JP		 133
134 vaf.fmt = fmt;
135 vaf.va = &args;
136
137 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
138
4cf46b67
AF		 139 va_end(args);
140}
141
1da177e4
LT		 142/* Deal with the reporting of failure conditions on a filesystem such as
143 * inconsistencies detected or read IO failures.
144 *
145 * On ext2, we can store the error state of the filesystem in the
146 * superblock. That is not possible on ext3, because we may have other
147 * write ordering constraints on the superblock which prevent us from
148 * writing it out straight away; and given that the journal is about to
149 * be aborted, we can't rely on the current, or future, transactions to
150 * write out the superblock safely.
151 *
152 * We'll just use the journal_abort() error code to record an error in
d6b198bc 153 * the journal instead. On recovery, the journal will complain about
1da177e4
LT		 154 * that error until we've noted it down and cleared it.
155 */
156
157static void ext3_handle_error(struct super_block *sb)
158{
159 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
160
161 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
162 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
163
164 if (sb->s_flags & MS_RDONLY)
165 return;
166
7543fc7b 167 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 168 journal_t *journal = EXT3_SB(sb)->s_journal;
169
e3c96435 170 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
1da177e4
LT		 171 if (journal)
172 journal_abort(journal, -EIO);
173 }
7543fc7b 174 if (test_opt (sb, ERRORS_RO)) {
4cf46b67
AF		 175 ext3_msg(sb, KERN_CRIT,
176 "error: remounting filesystem read-only");
7543fc7b
VA		 177 sb->s_flags |= MS_RDONLY;
178 }
179 ext3_commit_super(sb, es, 1);
1da177e4 180 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 181 panic("EXT3-fs (%s): panic forced after error\n",
1da177e4 182 sb->s_id);
1da177e4
LT		 183}
184
99fbb1e2
JP		 185void ext3_error(struct super_block *sb, const char *function,
186 const char *fmt, ...)
1da177e4 187{
99fbb1e2 188 struct va_format vaf;
1da177e4
LT		 189 va_list args;
190
191 va_start(args, fmt);
99fbb1e2
JP		 192
193 vaf.fmt = fmt;
194 vaf.va = &args;
195
196 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
197 sb->s_id, function, &vaf);
198
1da177e4
LT		 199 va_end(args);
200
201 ext3_handle_error(sb);
202}
203
204static const char *ext3_decode_error(struct super_block * sb, int errno,
205 char nbuf[16])
206{
207 char *errstr = NULL;
208
209 switch (errno) {
210 case -EIO:
211 errstr = "IO failure";
212 break;
213 case -ENOMEM:
214 errstr = "Out of memory";
215 break;
216 case -EROFS:
217 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
218 errstr = "Journal has aborted";
219 else
220 errstr = "Readonly filesystem";
221 break;
222 default:
223 /* If the caller passed in an extra buffer for unknown
224 * errors, textualise them now. Else we just return
225 * NULL. */
226 if (nbuf) {
227 /* Check for truncated error codes... */
228 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
229 errstr = nbuf;
230 }
231 break;
232 }
233
234 return errstr;
235}
236
237/* __ext3_std_error decodes expected errors from journaling functions
238 * automatically and invokes the appropriate error response. */
239
240void __ext3_std_error (struct super_block * sb, const char * function,
241 int errno)
242{
243 char nbuf[16];
30121624 244 const char *errstr;
1da177e4 245
30121624
ST		 246 /* Special case: if the error is EROFS, and we're not already
247 * inside a transaction, then there's really no point in logging
248 * an error. */
249 if (errno == -EROFS && journal_current_handle() == NULL &&
250 (sb->s_flags & MS_RDONLY))
251 return;
252
253 errstr = ext3_decode_error(sb, errno, nbuf);
4cf46b67 254 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
1da177e4
LT		 255
256 ext3_handle_error(sb);
257}
258
259/*
260 * ext3_abort is a much stronger failure handler than ext3_error. The
261 * abort function may be used to deal with unrecoverable failures such
262 * as journal IO errors or ENOMEM at a critical moment in log management.
263 *
264 * We unconditionally force the filesystem into an ABORT|READONLY state,
265 * unless the error response on the fs has been set to panic in which
266 * case we take the easy way out and panic immediately.
267 */
268
99fbb1e2
JP		 269void ext3_abort(struct super_block *sb, const char *function,
270 const char *fmt, ...)
1da177e4 271{
99fbb1e2 272 struct va_format vaf;
1da177e4
LT		 273 va_list args;
274
1da177e4 275 va_start(args, fmt);
99fbb1e2
JP		 276
277 vaf.fmt = fmt;
278 vaf.va = &args;
279
280 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
281 sb->s_id, function, &vaf);
282
1da177e4
LT		 283 va_end(args);
284
285 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 286 panic("EXT3-fs: panic from previous error\n");
1da177e4
LT		 287
288 if (sb->s_flags & MS_RDONLY)
289 return;
290
4cf46b67
AF		 291 ext3_msg(sb, KERN_CRIT,
292 "error: remounting filesystem read-only");
1da177e4
LT		 293 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
294 sb->s_flags |= MS_RDONLY;
e3c96435 295 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
44d6f787
HK		 296 if (EXT3_SB(sb)->s_journal)
297 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 298}
299
99fbb1e2
JP		 300void ext3_warning(struct super_block *sb, const char *function,
301 const char *fmt, ...)
1da177e4 302{
99fbb1e2 303 struct va_format vaf;
1da177e4
LT		 304 va_list args;
305
306 va_start(args, fmt);
99fbb1e2
JP		 307
308 vaf.fmt = fmt;
309 vaf.va = &args;
310
311 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
312 sb->s_id, function, &vaf);
313
1da177e4
LT		 314 va_end(args);
315}
316
317void ext3_update_dynamic_rev(struct super_block *sb)
318{
319 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
320
321 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
322 return;
323
4cf46b67
AF		 324 ext3_msg(sb, KERN_WARNING,
325 "warning: updating to rev %d because of "
326 "new feature flag, running e2fsck is recommended",
327 EXT3_DYNAMIC_REV);
1da177e4
LT		 328
329 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332 /* leave es->s_feature_*compat flags alone */
333 /* es->s_uuid will be set by e2fsck if empty */
334
335 /*
336 * The rest of the superblock fields should be zero, and if not it
337 * means they are likely already in use, so leave them alone. We
338 * can leave it up to e2fsck to clean up any inconsistencies there.
339 */
340}
341
342/*
343 * Open the external journal device
344 */
4cf46b67 345static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
1da177e4
LT		 346{
347 struct block_device *bdev;
348 char b[BDEVNAME_SIZE];
349
d4d77629 350 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
1da177e4
LT		 351 if (IS_ERR(bdev))
352 goto fail;
353 return bdev;
354
355fail:
4cf46b67
AF		 356 ext3_msg(sb, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
358
1da177e4
LT		 359 return NULL;
360}
361
362/*
363 * Release the journal device
364 */
365static int ext3_blkdev_put(struct block_device *bdev)
366{
e525fd89 367 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT		 368}
369
370static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
371{
372 struct block_device *bdev;
373 int ret = -ENODEV;
374
375 bdev = sbi->journal_bdev;
376 if (bdev) {
377 ret = ext3_blkdev_put(bdev);
378 sbi->journal_bdev = NULL;
379 }
380 return ret;
381}
382
383static inline struct inode *orphan_list_entry(struct list_head *l)
384{
385 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
386}
387
388static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
389{
390 struct list_head *l;
391
4cf46b67 392 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
1da177e4
LT		 393 le32_to_cpu(sbi->s_es->s_last_orphan));
394
4cf46b67 395 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
1da177e4
LT		 396 list_for_each(l, &sbi->s_orphan) {
397 struct inode *inode = orphan_list_entry(l);
4cf46b67 398 ext3_msg(sb, KERN_ERR, " "
eee194e7 399 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 400 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 401 inode->i_mode, inode->i_nlink,
1da177e4
LT		 402 NEXT_ORPHAN(inode));
403 }
404}
405
406static void ext3_put_super (struct super_block * sb)
407{
408 struct ext3_sb_info *sbi = EXT3_SB(sb);
409 struct ext3_super_block *es = sbi->s_es;
44d6f787 410 int i, err;
1da177e4 411
e0ccfd95 412 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
1da177e4 413 ext3_xattr_put_super(sb);
44d6f787
HK		 414 err = journal_destroy(sbi->s_journal);
415 sbi->s_journal = NULL;
416 if (err < 0)
2d7c820e 417 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 418
1da177e4
LT		 419 if (!(sb->s_flags & MS_RDONLY)) {
420 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
421 es->s_state = cpu_to_le16(sbi->s_mount_state);
422 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
423 mark_buffer_dirty(sbi->s_sbh);
424 ext3_commit_super(sb, es, 1);
425 }
426
427 for (i = 0; i < sbi->s_gdb_count; i++)
428 brelse(sbi->s_group_desc[i]);
429 kfree(sbi->s_group_desc);
430 percpu_counter_destroy(&sbi->s_freeblocks_counter);
431 percpu_counter_destroy(&sbi->s_freeinodes_counter);
432 percpu_counter_destroy(&sbi->s_dirs_counter);
433 brelse(sbi->s_sbh);
434#ifdef CONFIG_QUOTA
435 for (i = 0; i < MAXQUOTAS; i++)
436 kfree(sbi->s_qf_names[i]);
437#endif
438
439 /* Debugging code just in case the in-memory inode orphan list
440 * isn't empty. The on-disk one can be non-empty if we've
441 * detected an error and taken the fs readonly, but the
442 * in-memory list had better be clean by this point. */
443 if (!list_empty(&sbi->s_orphan))
444 dump_orphan_list(sb, sbi);
445 J_ASSERT(list_empty(&sbi->s_orphan));
446
f98393a6 447 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 448 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
449 /*
450 * Invalidate the journal device's buffers. We don't want them
451 * floating about in memory - the physical journal device may
452 * hotswapped, and it breaks the `ro-after' testing code.
453 */
454 sync_blockdev(sbi->journal_bdev);
f98393a6 455 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 456 ext3_blkdev_remove(sbi);
457 }
458 sb->s_fs_info = NULL;
5df096d6 459 kfree(sbi->s_blockgroup_lock);
1da177e4 460 kfree(sbi);
1da177e4
LT		 461}
462
e18b890b 463static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 464
465/*
466 * Called inside transaction, so use GFP_NOFS
467 */
468static struct inode *ext3_alloc_inode(struct super_block *sb)
469{
470 struct ext3_inode_info *ei;
471
e6b4f8da 472 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 473 if (!ei)
474 return NULL;
1da177e4
LT		 475 ei->i_block_alloc_info = NULL;
476 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 477 atomic_set(&ei->i_datasync_tid, 0);
478 atomic_set(&ei->i_sync_tid, 0);
1da177e4
LT		 479 return &ei->vfs_inode;
480}
481
785c4bcc
LC		 482static int ext3_drop_inode(struct inode *inode)
483{
484 int drop = generic_drop_inode(inode);
485
486 trace_ext3_drop_inode(inode, drop);
487 return drop;
488}
489
fa0d7e3d
NP		 490static void ext3_i_callback(struct rcu_head *head)
491{
492 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 493 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
494}
495
1da177e4
LT		 496static void ext3_destroy_inode(struct inode *inode)
497{
9f7dd93d
VA		 498 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
499 printk("EXT3 Inode %p: orphan list check failed!\n",
500 EXT3_I(inode));
501 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
502 EXT3_I(inode), sizeof(struct ext3_inode_info),
503 false);
504 dump_stack();
505 }
fa0d7e3d 506 call_rcu(&inode->i_rcu, ext3_i_callback);
1da177e4
LT		 507}
508
51cc5068 509static void init_once(void *foo)
1da177e4
LT		 510{
511 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
512
a35afb83 513 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 514#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 515 init_rwsem(&ei->xattr_sem);
1da177e4 516#endif
a35afb83
CL		 517 mutex_init(&ei->truncate_mutex);
518 inode_init_once(&ei->vfs_inode);
1da177e4 519}
ae6ddcc5 520
1da177e4
LT		 521static int init_inodecache(void)
522{
523 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
524 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 525 0, (SLAB_RECLAIM_ACCOUNT|
526 SLAB_MEM_SPREAD),
20c2df83 527 init_once);
1da177e4
LT		 528 if (ext3_inode_cachep == NULL)
529 return -ENOMEM;
530 return 0;
531}
532
533static void destroy_inodecache(void)
534{
8c0a8537
KS		 535 /*
536 * Make sure all delayed rcu free inodes are flushed before we
537 * destroy cache.
538 */
539 rcu_barrier();
1a1d92c1 540 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 541}
542
6cd37cda 543static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 544{
6cd37cda 545#if defined(CONFIG_QUOTA)
275abf5b 546 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 547
1aeec434
JK		 548 if (sbi->s_jquota_fmt) {
549 char *fmtname = "";
550
551 switch (sbi->s_jquota_fmt) {
552 case QFMT_VFS_OLD:
553 fmtname = "vfsold";
554 break;
555 case QFMT_VFS_V0:
556 fmtname = "vfsv0";
557 break;
558 case QFMT_VFS_V1:
559 fmtname = "vfsv1";
560 break;
561 }
562 seq_printf(seq, ",jqfmt=%s", fmtname);
563 }
8fc2751b
MB		 564
565 if (sbi->s_qf_names[USRQUOTA])
566 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
567
568 if (sbi->s_qf_names[GRPQUOTA])
569 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
570
e3c96435 571 if (test_opt(sb, USRQUOTA))
8fc2751b
MB		 572 seq_puts(seq, ",usrquota");
573
e3c96435 574 if (test_opt(sb, GRPQUOTA))
8fc2751b
MB		 575 seq_puts(seq, ",grpquota");
576#endif
6cd37cda
PO		 577}
578
3c4cec65
JK		 579static char *data_mode_string(unsigned long mode)
580{
581 switch (mode) {
582 case EXT3_MOUNT_JOURNAL_DATA:
583 return "journal";
584 case EXT3_MOUNT_ORDERED_DATA:
585 return "ordered";
586 case EXT3_MOUNT_WRITEBACK_DATA:
587 return "writeback";
588 }
589 return "unknown";
590}
591
571beed8
MS		 592/*
593 * Show an option if
594 * - it's set to a non-default value OR
595 * - if the per-sb default is different from the global default
596 */
34c80b1d 597static int ext3_show_options(struct seq_file *seq, struct dentry *root)
6cd37cda 598{
34c80b1d 599 struct super_block *sb = root->d_sb;
571beed8
MS		 600 struct ext3_sb_info *sbi = EXT3_SB(sb);
601 struct ext3_super_block *es = sbi->s_es;
602 unsigned long def_mount_opts;
603
604 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
605
606 if (sbi->s_sb_block != 1)
607 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
608 if (test_opt(sb, MINIX_DF))
609 seq_puts(seq, ",minixdf");
610 if (test_opt(sb, GRPID))
611 seq_puts(seq, ",grpid");
612 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
613 seq_puts(seq, ",nogrpid");
1523299d 614 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
571beed8 615 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
1523299d
EB		 616 seq_printf(seq, ",resuid=%u",
617 from_kuid_munged(&init_user_ns, sbi->s_resuid));
571beed8 618 }
1523299d 619 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
571beed8 620 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
1523299d
EB		 621 seq_printf(seq, ",resgid=%u",
622 from_kgid_munged(&init_user_ns, sbi->s_resgid));
571beed8 623 }
1eca93f9 624 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 625 int def_errors = le16_to_cpu(es->s_errors);
626
627 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 628 def_errors == EXT3_ERRORS_CONTINUE) {
629 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 630 }
631 }
1eca93f9
AK		 632 if (test_opt(sb, ERRORS_CONT))
633 seq_puts(seq, ",errors=continue");
571beed8
MS		 634 if (test_opt(sb, ERRORS_PANIC))
635 seq_puts(seq, ",errors=panic");
636 if (test_opt(sb, NO_UID32))
637 seq_puts(seq, ",nouid32");
638 if (test_opt(sb, DEBUG))
639 seq_puts(seq, ",debug");
571beed8
MS		 640#ifdef CONFIG_EXT3_FS_XATTR
641 if (test_opt(sb, XATTR_USER))
642 seq_puts(seq, ",user_xattr");
643 if (!test_opt(sb, XATTR_USER) &&
644 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
645 seq_puts(seq, ",nouser_xattr");
646 }
647#endif
648#ifdef CONFIG_EXT3_FS_POSIX_ACL
649 if (test_opt(sb, POSIX_ACL))
650 seq_puts(seq, ",acl");
651 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
652 seq_puts(seq, ",noacl");
653#endif
654 if (!test_opt(sb, RESERVATION))
655 seq_puts(seq, ",noreservation");
656 if (sbi->s_commit_interval) {
657 seq_printf(seq, ",commit=%u",
658 (unsigned) (sbi->s_commit_interval / HZ));
659 }
0636c73e
ES		 660
661 /*
662 * Always display barrier state so it's clear what the status is.
663 */
664 seq_puts(seq, ",barrier=");
665 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
e3c96435 666 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
0e4fb5e2
HK		 667 if (test_opt(sb, DATA_ERR_ABORT))
668 seq_puts(seq, ",data_err=abort");
669
dee1d3b6
ES		 670 if (test_opt(sb, NOLOAD))
671 seq_puts(seq, ",norecovery");
672
6cd37cda 673 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 674
675 return 0;
676}
1da177e4 677
fdb36673 678
74af0baa
CH		 679static struct inode *ext3_nfs_get_inode(struct super_block *sb,
680 u64 ino, u32 generation)
fdb36673 681{
fdb36673 682 struct inode *inode;
fdb36673
N		 683
684 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
685 return ERR_PTR(-ESTALE);
686 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
687 return ERR_PTR(-ESTALE);
688
689 /* iget isn't really right if the inode is currently unallocated!!
690 *
691 * ext3_read_inode will return a bad_inode if the inode had been
692 * deleted, so we should be safe.
693 *
694 * Currently we don't know the generation for parent directory, so
695 * a generation of 0 means "accept any"
696 */
473043dc
DH		 697 inode = ext3_iget(sb, ino);
698 if (IS_ERR(inode))
699 return ERR_CAST(inode);
700 if (generation && inode->i_generation != generation) {
fdb36673
N		 701 iput(inode);
702 return ERR_PTR(-ESTALE);
703 }
74af0baa
CH		 704
705 return inode;
706}
707
708static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
709 int fh_len, int fh_type)
710{
711 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
712 ext3_nfs_get_inode);
713}
714
715static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
716 int fh_len, int fh_type)
717{
718 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
719 ext3_nfs_get_inode);
fdb36673
N		 720}
721
6b082b53
TO		 722/*
723 * Try to release metadata pages (indirect blocks, directories) which are
724 * mapped via the block device. Since these pages could have journal heads
725 * which would prevent try_to_free_buffers() from freeing them, we must use
726 * jbd layer's try_to_free_buffers() function to release them.
727 */
728static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
729 gfp_t wait)
730{
731 journal_t *journal = EXT3_SB(sb)->s_journal;
732
733 WARN_ON(PageChecked(page));
734 if (!page_has_buffers(page))
735 return 0;
736 if (journal)
737 return journal_try_to_free_buffers(journal, page,
738 wait & ~__GFP_WAIT);
739 return try_to_free_buffers(page);
740}
741
8fc2751b 742#ifdef CONFIG_QUOTA
1da177e4
LT		 743#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
744#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
745
1da177e4
LT		 746static int ext3_write_dquot(struct dquot *dquot);
747static int ext3_acquire_dquot(struct dquot *dquot);
748static int ext3_release_dquot(struct dquot *dquot);
749static int ext3_mark_dquot_dirty(struct dquot *dquot);
750static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f 751static int ext3_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 752 struct path *path);
1da177e4
LT		 753static int ext3_quota_on_mount(struct super_block *sb, int type);
754static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
755 size_t len, loff_t off);
756static ssize_t ext3_quota_write(struct super_block *sb, int type,
757 const char *data, size_t len, loff_t off);
758
61e225dc 759static const struct dquot_operations ext3_quota_operations = {
1da177e4
LT		 760 .write_dquot = ext3_write_dquot,
761 .acquire_dquot = ext3_acquire_dquot,
762 .release_dquot = ext3_release_dquot,
763 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 764 .write_info = ext3_write_info,
765 .alloc_dquot = dquot_alloc,
766 .destroy_dquot = dquot_destroy,
1da177e4
LT		 767};
768
0d54b217 769static const struct quotactl_ops ext3_qctl_operations = {
1da177e4 770 .quota_on = ext3_quota_on,
287a8095
CH		 771 .quota_off = dquot_quota_off,
772 .quota_sync = dquot_quota_sync,
773 .get_info = dquot_get_dqinfo,
774 .set_info = dquot_set_dqinfo,
775 .get_dqblk = dquot_get_dqblk,
776 .set_dqblk = dquot_set_dqblk
1da177e4
LT		 777};
778#endif
779
ee9b6d61 780static const struct super_operations ext3_sops = {
1da177e4
LT		 781 .alloc_inode = ext3_alloc_inode,
782 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 783 .write_inode = ext3_write_inode,
784 .dirty_inode = ext3_dirty_inode,
785c4bcc 785 .drop_inode = ext3_drop_inode,
ac14a95b 786 .evict_inode = ext3_evict_inode,
1da177e4 787 .put_super = ext3_put_super,
1da177e4 788 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 789 .freeze_fs = ext3_freeze,
790 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 791 .statfs = ext3_statfs,
792 .remount_fs = ext3_remount,
8fc2751b 793 .show_options = ext3_show_options,
1da177e4
LT		 794#ifdef CONFIG_QUOTA
795 .quota_read = ext3_quota_read,
796 .quota_write = ext3_quota_write,
797#endif
6b082b53 798 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 799};
800
39655164 801static const struct export_operations ext3_export_ops = {
74af0baa
CH		 802 .fh_to_dentry = ext3_fh_to_dentry,
803 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 804 .get_parent = ext3_get_parent,
805};
806
807enum {
808 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
809 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 810 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 811 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 812 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 813 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 814 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 815 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 816 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1aeec434 817 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
0636c73e
ES		 818 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
819 Opt_resize, Opt_usrquota, Opt_grpquota
1da177e4
LT		 820};
821
a447c093 822static const match_table_t tokens = {
1da177e4
LT		 823 {Opt_bsd_df, "bsddf"},
824 {Opt_minix_df, "minixdf"},
825 {Opt_grpid, "grpid"},
826 {Opt_grpid, "bsdgroups"},
827 {Opt_nogrpid, "nogrpid"},
828 {Opt_nogrpid, "sysvgroups"},
829 {Opt_resgid, "resgid=%u"},
830 {Opt_resuid, "resuid=%u"},
831 {Opt_sb, "sb=%u"},
832 {Opt_err_cont, "errors=continue"},
833 {Opt_err_panic, "errors=panic"},
834 {Opt_err_ro, "errors=remount-ro"},
835 {Opt_nouid32, "nouid32"},
836 {Opt_nocheck, "nocheck"},
837 {Opt_nocheck, "check=none"},
1da177e4
LT		 838 {Opt_debug, "debug"},
839 {Opt_oldalloc, "oldalloc"},
840 {Opt_orlov, "orlov"},
841 {Opt_user_xattr, "user_xattr"},
842 {Opt_nouser_xattr, "nouser_xattr"},
843 {Opt_acl, "acl"},
844 {Opt_noacl, "noacl"},
845 {Opt_reservation, "reservation"},
846 {Opt_noreservation, "noreservation"},
847 {Opt_noload, "noload"},
dee1d3b6 848 {Opt_noload, "norecovery"},
1da177e4 849 {Opt_nobh, "nobh"},
ade1a29e 850 {Opt_bh, "bh"},
1da177e4
LT		 851 {Opt_commit, "commit=%u"},
852 {Opt_journal_update, "journal=update"},
853 {Opt_journal_inum, "journal=%u"},
71b96257 854 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 855 {Opt_abort, "abort"},
856 {Opt_data_journal, "data=journal"},
857 {Opt_data_ordered, "data=ordered"},
858 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 859 {Opt_data_err_abort, "data_err=abort"},
860 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 861 {Opt_offusrjquota, "usrjquota="},
862 {Opt_usrjquota, "usrjquota=%s"},
863 {Opt_offgrpjquota, "grpjquota="},
864 {Opt_grpjquota, "grpjquota=%s"},
865 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
866 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1aeec434 867 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
8fc2751b 868 {Opt_grpquota, "grpquota"},
1f54587b
JK		 869 {Opt_noquota, "noquota"},
870 {Opt_quota, "quota"},
8fc2751b 871 {Opt_usrquota, "usrquota"},
1da177e4 872 {Opt_barrier, "barrier=%u"},
0636c73e
ES		 873 {Opt_barrier, "barrier"},
874 {Opt_nobarrier, "nobarrier"},
1da177e4 875 {Opt_resize, "resize"},
92587216 876 {Opt_err, NULL},
1da177e4
LT		 877};
878
4cf46b67 879static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 880{
e9ad5620
DK		 881 ext3_fsblk_t sb_block;
882 char *options = (char *) *data;
1da177e4
LT		 883
884 if (!options || strncmp(options, "sb=", 3) != 0)
885 return 1; /* Default location */
886 options += 3;
43d23f90 887 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 888 sb_block = simple_strtoul(options, &options, 0);
889 if (*options && *options != ',') {
4cf46b67 890 ext3_msg(sb, "error: invalid sb specification: %s",
1da177e4
LT		 891 (char *) *data);
892 return 1;
893 }
894 if (*options == ',')
895 options++;
896 *data = (void *) options;
897 return sb_block;
898}
899
e1f5c67a
DM		 900#ifdef CONFIG_QUOTA
901static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
902{
903 struct ext3_sb_info *sbi = EXT3_SB(sb);
904 char *qname;
905
906 if (sb_any_quota_loaded(sb) &&
907 !sbi->s_qf_names[qtype]) {
908 ext3_msg(sb, KERN_ERR,
909 "Cannot change journaled "
910 "quota options when quota turned on");
911 return 0;
912 }
913 qname = match_strdup(args);
914 if (!qname) {
915 ext3_msg(sb, KERN_ERR,
916 "Not enough memory for storing quotafile name");
917 return 0;
918 }
f56426ae
JK		 919 if (sbi->s_qf_names[qtype]) {
920 int same = !strcmp(sbi->s_qf_names[qtype], qname);
921
e1f5c67a 922 kfree(qname);
f56426ae
JK		 923 if (!same) {
924 ext3_msg(sb, KERN_ERR,
925 "%s quota file already specified",
926 QTYPE2NAME(qtype));
927 }
928 return same;
e1f5c67a 929 }
f56426ae 930 if (strchr(qname, '/')) {
e1f5c67a
DM		 931 ext3_msg(sb, KERN_ERR,
932 "quotafile must be on filesystem root");
f56426ae 933 kfree(qname);
e1f5c67a
DM		 934 return 0;
935 }
f56426ae 936 sbi->s_qf_names[qtype] = qname;
e1f5c67a
DM		 937 set_opt(sbi->s_mount_opt, QUOTA);
938 return 1;
939}
940
941static int clear_qf_name(struct super_block *sb, int qtype) {
942
943 struct ext3_sb_info *sbi = EXT3_SB(sb);
944
945 if (sb_any_quota_loaded(sb) &&
946 sbi->s_qf_names[qtype]) {
947 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
948 " when quota turned on");
949 return 0;
950 }
f56426ae
JK		 951 if (sbi->s_qf_names[qtype]) {
952 kfree(sbi->s_qf_names[qtype]);
953 sbi->s_qf_names[qtype] = NULL;
954 }
e1f5c67a
DM		 955 return 1;
956}
957#endif
958
71b96257 959static int parse_options (char *options, struct super_block *sb,
eee194e7 960 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 961 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 962{
963 struct ext3_sb_info *sbi = EXT3_SB(sb);
964 char * p;
965 substring_t args[MAX_OPT_ARGS];
966 int data_opt = 0;
967 int option;
1523299d
EB		 968 kuid_t uid;
969 kgid_t gid;
1da177e4 970#ifdef CONFIG_QUOTA
e1f5c67a 971 int qfmt;
1da177e4
LT		 972#endif
973
974 if (!options)
975 return 1;
976
977 while ((p = strsep (&options, ",")) != NULL) {
978 int token;
979 if (!*p)
980 continue;
0636c73e
ES		 981 /*
982 * Initialize args struct so we know whether arg was
983 * found; some options take optional arguments.
984 */
76f59b3b 985 args[0].to = args[0].from = NULL;
1da177e4
LT		 986 token = match_token(p, tokens, args);
987 switch (token) {
988 case Opt_bsd_df:
989 clear_opt (sbi->s_mount_opt, MINIX_DF);
990 break;
991 case Opt_minix_df:
992 set_opt (sbi->s_mount_opt, MINIX_DF);
993 break;
994 case Opt_grpid:
995 set_opt (sbi->s_mount_opt, GRPID);
996 break;
997 case Opt_nogrpid:
998 clear_opt (sbi->s_mount_opt, GRPID);
999 break;
1000 case Opt_resuid:
1001 if (match_int(&args[0], &option))
1002 return 0;
1523299d
EB		 1003 uid = make_kuid(current_user_ns(), option);
1004 if (!uid_valid(uid)) {
1005 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
66415f6b 1006 return 0;
1523299d
EB		 1007
1008 }
1009 sbi->s_resuid = uid;
1da177e4
LT		 1010 break;
1011 case Opt_resgid:
1012 if (match_int(&args[0], &option))
1013 return 0;
1523299d
EB		 1014 gid = make_kgid(current_user_ns(), option);
1015 if (!gid_valid(gid)) {
1016 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
66415f6b 1017 return 0;
1523299d
EB		 1018 }
1019 sbi->s_resgid = gid;
1da177e4
LT		 1020 break;
1021 case Opt_sb:
1022 /* handled by get_sb_block() instead of here */
1023 /* *sb_block = match_int(&args[0]); */
1024 break;
1025 case Opt_err_panic:
1026 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1027 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1028 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1029 break;
1030 case Opt_err_ro:
1031 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1032 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1033 set_opt (sbi->s_mount_opt, ERRORS_RO);
1034 break;
1035 case Opt_err_cont:
1036 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1037 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1038 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1039 break;
1040 case Opt_nouid32:
1041 set_opt (sbi->s_mount_opt, NO_UID32);
1042 break;
1da177e4
LT		 1043 case Opt_nocheck:
1044 clear_opt (sbi->s_mount_opt, CHECK);
1045 break;
1046 case Opt_debug:
1047 set_opt (sbi->s_mount_opt, DEBUG);
1048 break;
1049 case Opt_oldalloc:
fbc85402
LC		 1050 ext3_msg(sb, KERN_WARNING,
1051 "Ignoring deprecated oldalloc option");
1da177e4
LT		 1052 break;
1053 case Opt_orlov:
fbc85402
LC		 1054 ext3_msg(sb, KERN_WARNING,
1055 "Ignoring deprecated orlov option");
1da177e4
LT		 1056 break;
1057#ifdef CONFIG_EXT3_FS_XATTR
1058 case Opt_user_xattr:
1059 set_opt (sbi->s_mount_opt, XATTR_USER);
1060 break;
1061 case Opt_nouser_xattr:
1062 clear_opt (sbi->s_mount_opt, XATTR_USER);
1063 break;
1064#else
1065 case Opt_user_xattr:
1066 case Opt_nouser_xattr:
4cf46b67
AF		 1067 ext3_msg(sb, KERN_INFO,
1068 "(no)user_xattr options not supported");
1da177e4
LT		 1069 break;
1070#endif
1071#ifdef CONFIG_EXT3_FS_POSIX_ACL
1072 case Opt_acl:
1073 set_opt(sbi->s_mount_opt, POSIX_ACL);
1074 break;
1075 case Opt_noacl:
1076 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1077 break;
1078#else
1079 case Opt_acl:
1080 case Opt_noacl:
4cf46b67
AF		 1081 ext3_msg(sb, KERN_INFO,
1082 "(no)acl options not supported");
1da177e4
LT		 1083 break;
1084#endif
1085 case Opt_reservation:
1086 set_opt(sbi->s_mount_opt, RESERVATION);
1087 break;
1088 case Opt_noreservation:
1089 clear_opt(sbi->s_mount_opt, RESERVATION);
1090 break;
1091 case Opt_journal_update:
1092 /* @@@ FIXME */
1093 /* Eventually we will want to be able to create
1094 a journal file here. For now, only allow the
1095 user to specify an existing inode to be the
1096 journal file. */
1097 if (is_remount) {
4cf46b67
AF		 1098 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1099 "journal on remount");
1da177e4
LT		 1100 return 0;
1101 }
1102 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1103 break;
1104 case Opt_journal_inum:
1105 if (is_remount) {
4cf46b67
AF		 1106 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1107 "journal on remount");
1da177e4
LT		 1108 return 0;
1109 }
1110 if (match_int(&args[0], &option))
1111 return 0;
1112 *inum = option;
1113 break;
71b96257
JL		 1114 case Opt_journal_dev:
1115 if (is_remount) {
4cf46b67
AF		 1116 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1117 "journal on remount");
71b96257
JL		 1118 return 0;
1119 }
1120 if (match_int(&args[0], &option))
1121 return 0;
1122 *journal_devnum = option;
1123 break;
1da177e4
LT		 1124 case Opt_noload:
1125 set_opt (sbi->s_mount_opt, NOLOAD);
1126 break;
1127 case Opt_commit:
1128 if (match_int(&args[0], &option))
1129 return 0;
1130 if (option < 0)
1131 return 0;
1132 if (option == 0)
1133 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1134 sbi->s_commit_interval = HZ * option;
1135 break;
1136 case Opt_data_journal:
1137 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1138 goto datacheck;
1139 case Opt_data_ordered:
1140 data_opt = EXT3_MOUNT_ORDERED_DATA;
1141 goto datacheck;
1142 case Opt_data_writeback:
1143 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1144 datacheck:
1145 if (is_remount) {
e3c96435 1146 if (test_opt(sb, DATA_FLAGS) == data_opt)
3c4cec65 1147 break;
4cf46b67
AF		 1148 ext3_msg(sb, KERN_ERR,
1149 "error: cannot change "
3c4cec65
JK		 1150 "data mode on remount. The filesystem "
1151 "is mounted in data=%s mode and you "
4cf46b67 1152 "try to remount it in data=%s mode.",
e3c96435
DM		 1153 data_mode_string(test_opt(sb,
1154 DATA_FLAGS)),
3c4cec65
JK		 1155 data_mode_string(data_opt));
1156 return 0;
1da177e4 1157 } else {
e3c96435 1158 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1da177e4
LT		 1159 sbi->s_mount_opt |= data_opt;
1160 }
1161 break;
0e4fb5e2
HK		 1162 case Opt_data_err_abort:
1163 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1164 break;
1165 case Opt_data_err_ignore:
1166 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1167 break;
1da177e4
LT		 1168#ifdef CONFIG_QUOTA
1169 case Opt_usrjquota:
e1f5c67a 1170 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1da177e4 1171 return 0;
e1f5c67a
DM		 1172 break;
1173 case Opt_grpjquota:
1174 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1da177e4 1175 return 0;
1da177e4
LT		 1176 break;
1177 case Opt_offusrjquota:
e1f5c67a
DM		 1178 if (!clear_qf_name(sb, USRQUOTA))
1179 return 0;
1180 break;
1da177e4 1181 case Opt_offgrpjquota:
e1f5c67a 1182 if (!clear_qf_name(sb, GRPQUOTA))
1da177e4 1183 return 0;
1da177e4
LT		 1184 break;
1185 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1186 qfmt = QFMT_VFS_OLD;
1187 goto set_qf_format;
1da177e4 1188 case Opt_jqfmt_vfsv0:
d06bf1d2 1189 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1190 goto set_qf_format;
1191 case Opt_jqfmt_vfsv1:
1192 qfmt = QFMT_VFS_V1;
d06bf1d2 1193set_qf_format:
ee0d5ffe 1194 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1195 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1196 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1197 "journaled quota options when "
4cf46b67 1198 "quota turned on.");
d06bf1d2
JK		 1199 return 0;
1200 }
1201 sbi->s_jquota_fmt = qfmt;
1da177e4 1202 break;
1f54587b 1203 case Opt_quota:
8fc2751b
MB		 1204 case Opt_usrquota:
1205 set_opt(sbi->s_mount_opt, QUOTA);
1206 set_opt(sbi->s_mount_opt, USRQUOTA);
1207 break;
1208 case Opt_grpquota:
1f54587b 1209 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1210 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1211 break;
1212 case Opt_noquota:
ee0d5ffe 1213 if (sb_any_quota_loaded(sb)) {
4cf46b67
AF		 1214 ext3_msg(sb, KERN_ERR, "error: cannot change "
1215 "quota options when quota turned on.");
1f54587b
JK		 1216 return 0;
1217 }
1218 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1219 clear_opt(sbi->s_mount_opt, USRQUOTA);
1220 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1221 break;
1da177e4 1222#else
8fc2751b
MB		 1223 case Opt_quota:
1224 case Opt_usrquota:
1225 case Opt_grpquota:
4cf46b67
AF		 1226 ext3_msg(sb, KERN_ERR,
1227 "error: quota options not supported.");
fa1ff1e0 1228 break;
1da177e4
LT		 1229 case Opt_usrjquota:
1230 case Opt_grpjquota:
1231 case Opt_offusrjquota:
1232 case Opt_offgrpjquota:
1233 case Opt_jqfmt_vfsold:
1234 case Opt_jqfmt_vfsv0:
1aeec434 1235 case Opt_jqfmt_vfsv1:
4cf46b67
AF		 1236 ext3_msg(sb, KERN_ERR,
1237 "error: journaled quota options not "
1238 "supported.");
1da177e4 1239 break;
1f54587b
JK		 1240 case Opt_noquota:
1241 break;
1da177e4
LT		 1242#endif
1243 case Opt_abort:
1244 set_opt(sbi->s_mount_opt, ABORT);
1245 break;
0636c73e
ES		 1246 case Opt_nobarrier:
1247 clear_opt(sbi->s_mount_opt, BARRIER);
1248 break;
1da177e4 1249 case Opt_barrier:
0636c73e
ES		 1250 if (args[0].from) {
1251 if (match_int(&args[0], &option))
1252 return 0;
1253 } else
1254 option = 1; /* No argument, default to 1 */
1da177e4
LT		 1255 if (option)
1256 set_opt(sbi->s_mount_opt, BARRIER);
1257 else
1258 clear_opt(sbi->s_mount_opt, BARRIER);
1259 break;
1260 case Opt_ignore:
1261 break;
1262 case Opt_resize:
08c6a96f 1263 if (!is_remount) {
4cf46b67
AF		 1264 ext3_msg(sb, KERN_ERR,
1265 "error: resize option only available "
1266 "for remount");
1da177e4
LT		 1267 return 0;
1268 }
c7f1721e
KZ		 1269 if (match_int(&args[0], &option) != 0)
1270 return 0;
1da177e4
LT		 1271 *n_blocks_count = option;
1272 break;
1273 case Opt_nobh:
4c4d3901
CH		 1274 ext3_msg(sb, KERN_WARNING,
1275 "warning: ignoring deprecated nobh option");
1da177e4 1276 break;
ade1a29e 1277 case Opt_bh:
4c4d3901
CH		 1278 ext3_msg(sb, KERN_WARNING,
1279 "warning: ignoring deprecated bh option");
ade1a29e 1280 break;
1da177e4 1281 default:
4cf46b67
AF		 1282 ext3_msg(sb, KERN_ERR,
1283 "error: unrecognized mount option \"%s\" "
1284 "or missing value", p);
1da177e4
LT		 1285 return 0;
1286 }
1287 }
1288#ifdef CONFIG_QUOTA
8fc2751b 1289 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
e3c96435 1290 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
8fc2751b 1291 clear_opt(sbi->s_mount_opt, USRQUOTA);
e3c96435 1292 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
8fc2751b
MB		 1293 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1294
e1f5c67a 1295 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
4cf46b67
AF		 1296 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1297 "format mixing.");
8fc2751b
MB		 1298 return 0;
1299 }
1300
1301 if (!sbi->s_jquota_fmt) {
4cf46b67
AF		 1302 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1303 "not specified.");
8fc2751b
MB		 1304 return 0;
1305 }
1306 } else {
1307 if (sbi->s_jquota_fmt) {
4cf46b67 1308 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
99aeaf63 1309 "specified with no journaling "
4cf46b67 1310 "enabled.");
8fc2751b
MB		 1311 return 0;
1312 }
1da177e4
LT		 1313 }
1314#endif
1da177e4
LT		 1315 return 1;
1316}
1317
1318static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1319 int read_only)
1320{
1321 struct ext3_sb_info *sbi = EXT3_SB(sb);
1322 int res = 0;
1323
1324 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
AF		 1325 ext3_msg(sb, KERN_ERR,
1326 "error: revision level too high, "
1327 "forcing read-only mode");
1da177e4
LT		 1328 res = MS_RDONLY;
1329 }
1330 if (read_only)
1331 return res;
1332 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
AF		 1333 ext3_msg(sb, KERN_WARNING,
1334 "warning: mounting unchecked fs, "
1335 "running e2fsck is recommended");
1da177e4 1336 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
AF		 1337 ext3_msg(sb, KERN_WARNING,
1338 "warning: mounting fs with errors, "
1339 "running e2fsck is recommended");
df0d6b8f 1340 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1da177e4 1341 le16_to_cpu(es->s_mnt_count) >=
df0d6b8f 1342 le16_to_cpu(es->s_max_mnt_count))
4cf46b67
AF		 1343 ext3_msg(sb, KERN_WARNING,
1344 "warning: maximal mount count reached, "
1345 "running e2fsck is recommended");
1da177e4
LT		 1346 else if (le32_to_cpu(es->s_checkinterval) &&
1347 (le32_to_cpu(es->s_lastcheck) +
1348 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
AF		 1349 ext3_msg(sb, KERN_WARNING,
1350 "warning: checktime reached, "
1351 "running e2fsck is recommended");
1da177e4
LT		 1352#if 0
1353 /* @@@ We _will_ want to clear the valid bit if we find
1354 inconsistencies, to force a fsck at reboot. But for
1355 a plain journaled filesystem we can keep it set as
1356 valid forever! :) */
e7f23ebd 1357 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4 1358#endif
df0d6b8f 1359 if (!le16_to_cpu(es->s_max_mnt_count))
1da177e4 1360 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1361 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1362 es->s_mtime = cpu_to_le32(get_seconds());
1363 ext3_update_dynamic_rev(sb);
1364 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1365
1366 ext3_commit_super(sb, es, 1);
1367 if (test_opt(sb, DEBUG))
4cf46b67
AF		 1368 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1369 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1370 sb->s_blocksize,
1371 sbi->s_groups_count,
1372 EXT3_BLOCKS_PER_GROUP(sb),
1373 EXT3_INODES_PER_GROUP(sb),
1374 sbi->s_mount_opt);
1375
1da177e4
LT		 1376 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1377 char b[BDEVNAME_SIZE];
4cf46b67 1378 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1379 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1380 } else {
4cf46b67 1381 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1382 }
d71bc6db 1383 cleancache_init_fs(sb);
1da177e4
LT		 1384 return res;
1385}
1386
1387/* Called at mount-time, super-block is locked */
197cd65a 1388static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1389{
1390 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1391 int i;
1392
1393 ext3_debug ("Checking group descriptors");
1394
197cd65a
AM		 1395 for (i = 0; i < sbi->s_groups_count; i++) {
1396 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1397 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1398 ext3_fsblk_t last_block;
197cd65a 1399
855565e8
ES		 1400 if (i == sbi->s_groups_count - 1)
1401 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1402 else
1403 last_block = first_block +
1404 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1405
855565e8
ES		 1406 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1407 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1408 {
1409 ext3_error (sb, "ext3_check_descriptors",
1410 "Block bitmap for group %d"
1411 " not in group (block %lu)!",
1412 i, (unsigned long)
1413 le32_to_cpu(gdp->bg_block_bitmap));
1414 return 0;
1415 }
855565e8
ES		 1416 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1417 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1418 {
1419 ext3_error (sb, "ext3_check_descriptors",
1420 "Inode bitmap for group %d"
1421 " not in group (block %lu)!",
1422 i, (unsigned long)
1423 le32_to_cpu(gdp->bg_inode_bitmap));
1424 return 0;
1425 }
855565e8 1426 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1427 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1428 last_block)
1da177e4
LT		 1429 {
1430 ext3_error (sb, "ext3_check_descriptors",
1431 "Inode table for group %d"
1432 " not in group (block %lu)!",
1433 i, (unsigned long)
1434 le32_to_cpu(gdp->bg_inode_table));
1435 return 0;
1436 }
1da177e4
LT		 1437 }
1438
1439 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1440 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1441 return 1;
1442}
1443
1444
1445/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1446 * the superblock) which were deleted from all directories, but held open by
1447 * a process at the time of a crash. We walk the list and try to delete these
1448 * inodes at recovery time (only with a read-write filesystem).
1449 *
1450 * In order to keep the orphan inode chain consistent during traversal (in
1451 * case of crash during recovery), we link each inode into the superblock
1452 * orphan list_head and handle it the same way as an inode deletion during
1453 * normal operation (which journals the operations for us).
1454 *
1455 * We only do an iget() and an iput() on each inode, which is very safe if we
1456 * accidentally point at an in-use or already deleted inode. The worst that
1457 * can happen in this case is that we get a "bit already cleared" message from
1458 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1459 * e2fsck was run on this filesystem, and it must have already done the orphan
1460 * inode cleanup for us, so we can safely abort without any further action.
1461 */
1462static void ext3_orphan_cleanup (struct super_block * sb,
1463 struct ext3_super_block * es)
1464{
1465 unsigned int s_flags = sb->s_flags;
1466 int nr_orphans = 0, nr_truncates = 0;
1467#ifdef CONFIG_QUOTA
1468 int i;
1469#endif
1470 if (!es->s_last_orphan) {
1471 jbd_debug(4, "no orphan inodes to clean up\n");
1472 return;
1473 }
1474
a8f48a95 1475 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
AF		 1476 ext3_msg(sb, KERN_ERR, "error: write access "
1477 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1478 return;
1479 }
1480
ce654b37
AG		 1481 /* Check if feature set allows readwrite operations */
1482 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1483 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1484 "unknown ROCOMPAT features");
1485 return;
a8f48a95
ES		 1486 }
1487
1da177e4 1488 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
e4230108
ES		 1489 /* don't clear list on RO mount w/ errors */
1490 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1da177e4
LT		 1491 jbd_debug(1, "Errors on filesystem, "
1492 "clearing orphan list.\n");
e4230108
ES		 1493 es->s_last_orphan = 0;
1494 }
1da177e4
LT		 1495 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1496 return;
1497 }
1498
1499 if (s_flags & MS_RDONLY) {
4cf46b67 1500 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1501 sb->s_flags &= ~MS_RDONLY;
1502 }
1503#ifdef CONFIG_QUOTA
1504 /* Needed for iput() to work correctly and not trash data */
1505 sb->s_flags |= MS_ACTIVE;
1506 /* Turn on quotas so that they are updated correctly */
1507 for (i = 0; i < MAXQUOTAS; i++) {
1508 if (EXT3_SB(sb)->s_qf_names[i]) {
1509 int ret = ext3_quota_on_mount(sb, i);
1510 if (ret < 0)
4cf46b67
AF		 1511 ext3_msg(sb, KERN_ERR,
1512 "error: cannot turn on journaled "
1513 "quota: %d", ret);
1da177e4
LT		 1514 }
1515 }
1516#endif
1517
1518 while (es->s_last_orphan) {
1519 struct inode *inode;
1520
473043dc
DH		 1521 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1522 if (IS_ERR(inode)) {
1da177e4
LT		 1523 es->s_last_orphan = 0;
1524 break;
1525 }
1526
1527 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
871a2931 1528 dquot_initialize(inode);
1da177e4
LT		 1529 if (inode->i_nlink) {
1530 printk(KERN_DEBUG
eee194e7 1531 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1532 __func__, inode->i_ino, inode->i_size);
eee194e7 1533 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1534 inode->i_ino, inode->i_size);
1535 ext3_truncate(inode);
1536 nr_truncates++;
1537 } else {
1538 printk(KERN_DEBUG
eee194e7 1539 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1540 __func__, inode->i_ino);
eee194e7 1541 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1542 inode->i_ino);
1543 nr_orphans++;
1544 }
1545 iput(inode); /* The delete magic happens here! */
1546 }
1547
1548#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1549
1550 if (nr_orphans)
4cf46b67
AF		 1551 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1552 PLURAL(nr_orphans));
1da177e4 1553 if (nr_truncates)
4cf46b67
AF		 1554 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1555 PLURAL(nr_truncates));
1da177e4
LT		 1556#ifdef CONFIG_QUOTA
1557 /* Turn quotas off */
1558 for (i = 0; i < MAXQUOTAS; i++) {
1559 if (sb_dqopt(sb)->files[i])
287a8095 1560 dquot_quota_off(sb, i);
1da177e4
LT		 1561 }
1562#endif
1563 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1564}
1565
1da177e4
LT		 1566/*
1567 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1568 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1569 * We need to be 1 filesystem block less than the 2^32 sector limit.
1570 */
1571static loff_t ext3_max_size(int bits)
1572{
1573 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1574 int meta_blocks;
1575 loff_t upper_limit;
1576
1577 /* This is calculated to be the largest file size for a
1578 * dense, file such that the total number of
1da177e4 1579 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1580 * does not exceed 2^32 -1
1581 * __u32 i_blocks representing the total number of
1582 * 512 bytes blocks of the file
1583 */
1584 upper_limit = (1LL << 32) - 1;
1585
1586 /* total blocks in file system block size */
1587 upper_limit >>= (bits - 9);
1588
1589
1590 /* indirect blocks */
1591 meta_blocks = 1;
1592 /* double indirect blocks */
1593 meta_blocks += 1 + (1LL << (bits-2));
1594 /* tripple indirect blocks */
1595 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1596
1597 upper_limit -= meta_blocks;
1598 upper_limit <<= bits;
1da177e4
LT		 1599
1600 res += 1LL << (bits-2);
1601 res += 1LL << (2*(bits-2));
1602 res += 1LL << (3*(bits-2));
1603 res <<= bits;
1604 if (res > upper_limit)
1605 res = upper_limit;
fe7fdc37
AK		 1606
1607 if (res > MAX_LFS_FILESIZE)
1608 res = MAX_LFS_FILESIZE;
1609
1da177e4
LT		 1610 return res;
1611}
1612
43d23f90
MC		 1613static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1614 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1615 int nr)
1616{
1617 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1618 unsigned long bg, first_meta_bg;
1da177e4
LT		 1619 int has_super = 0;
1620
1da177e4
LT		 1621 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1622
1623 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1624 nr < first_meta_bg)
1625 return (logic_sb_block + nr + 1);
1626 bg = sbi->s_desc_per_block * nr;
1627 if (ext3_bg_has_super(sb, bg))
1628 has_super = 1;
43d23f90 1629 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1630}
1631
1632
1633static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1634{
1635 struct buffer_head * bh;
1636 struct ext3_super_block *es = NULL;
1637 struct ext3_sb_info *sbi;
43d23f90 1638 ext3_fsblk_t block;
4cf46b67 1639 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1640 ext3_fsblk_t logic_sb_block;
1da177e4 1641 unsigned long offset = 0;
eee194e7 1642 unsigned int journal_inum = 0;
71b96257 1643 unsigned long journal_devnum = 0;
1da177e4
LT		 1644 unsigned long def_mount_opts;
1645 struct inode *root;
1646 int blocksize;
1647 int hblock;
1648 int db_count;
1649 int i;
1650 int needs_recovery;
473043dc 1651 int ret = -EINVAL;
1da177e4 1652 __le32 features;
833f4077 1653 int err;
1da177e4 1654
f8314dc6 1655 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1656 if (!sbi)
1657 return -ENOMEM;
5df096d6
PE		 1658
1659 sbi->s_blockgroup_lock =
1660 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1661 if (!sbi->s_blockgroup_lock) {
1662 kfree(sbi);
1663 return -ENOMEM;
1664 }
1da177e4 1665 sb->s_fs_info = sbi;
571beed8 1666 sbi->s_sb_block = sb_block;
1da177e4 1667
1da177e4
LT		 1668 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1669 if (!blocksize) {
4cf46b67 1670 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1671 goto out_fail;
1672 }
1673
1674 /*
1675 * The ext3 superblock will not be buffer aligned for other than 1kB
1676 * block sizes. We need to calculate the offset from buffer start.
1677 */
1678 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1679 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1680 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1681 } else {
1682 logic_sb_block = sb_block;
1683 }
1684
1685 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1686 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1687 goto out_fail;
1688 }
1689 /*
1690 * Note: s_es must be initialized as soon as possible because
1691 * some ext3 macro-instructions depend on its value
1692 */
57e94d86 1693 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 1694 sbi->s_es = es;
1695 sb->s_magic = le16_to_cpu(es->s_magic);
1696 if (sb->s_magic != EXT3_SUPER_MAGIC)
1697 goto cantfind_ext3;
1698
1699 /* Set defaults before we parse the mount options */
1700 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1701 if (def_mount_opts & EXT3_DEFM_DEBUG)
1702 set_opt(sbi->s_mount_opt, DEBUG);
1703 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1704 set_opt(sbi->s_mount_opt, GRPID);
1705 if (def_mount_opts & EXT3_DEFM_UID16)
1706 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1707#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1708 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1709 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1710#endif
1711#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1712 if (def_mount_opts & EXT3_DEFM_ACL)
1713 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1714#endif
1da177e4 1715 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
e3c96435 1716 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1da177e4 1717 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
e3c96435 1718 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1da177e4 1719 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
e3c96435 1720 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1da177e4
LT		 1721
1722 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1723 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1724 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1725 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1726 else
1727 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4 1728
1523299d
EB		 1729 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1730 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1da177e4 1731
00eacd66
CH		 1732 /* enable barriers by default */
1733 set_opt(sbi->s_mount_opt, BARRIER);
1da177e4
LT		 1734 set_opt(sbi->s_mount_opt, RESERVATION);
1735
71b96257
JL		 1736 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1737 NULL, 0))
1da177e4
LT		 1738 goto failed_mount;
1739
1740 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 1741 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 1742
1743 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1744 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1745 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1746 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
AF		 1747 ext3_msg(sb, KERN_WARNING,
1748 "warning: feature flags set on rev 0 fs, "
1749 "running e2fsck is recommended");
1da177e4
LT		 1750 /*
1751 * Check feature flags regardless of the revision level, since we
1752 * previously didn't change the revision level when setting the flags,
1753 * so there is a chance incompat flags are set on a rev 0 filesystem.
1754 */
1755 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1756 if (features) {
4cf46b67
AF		 1757 ext3_msg(sb, KERN_ERR,
1758 "error: couldn't mount because of unsupported "
1759 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1760 goto failed_mount;
1761 }
1762 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1763 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
AF		 1764 ext3_msg(sb, KERN_ERR,
1765 "error: couldn't mount RDWR because of unsupported "
1766 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1767 goto failed_mount;
1768 }
1769 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1770
1771 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1772 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
AF		 1773 ext3_msg(sb, KERN_ERR,
1774 "error: couldn't mount because of unsupported "
1775 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1776 goto failed_mount;
1777 }
1778
e1defc4f 1779 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1780 if (sb->s_blocksize != blocksize) {
1781 /*
1782 * Make sure the blocksize for the filesystem is larger
1783 * than the hardware sectorsize for the machine.
1784 */
1785 if (blocksize < hblock) {
4cf46b67
AF		 1786 ext3_msg(sb, KERN_ERR,
1787 "error: fsblocksize %d too small for "
1788 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1789 goto failed_mount;
1790 }
1791
1792 brelse (bh);
0f0a89eb 1793 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
AF		 1794 ext3_msg(sb, KERN_ERR,
1795 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1796 goto out_fail;
1797 }
1da177e4
LT		 1798 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1799 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1800 bh = sb_bread(sb, logic_sb_block);
1801 if (!bh) {
4cf46b67
AF		 1802 ext3_msg(sb, KERN_ERR,
1803 "error: can't read superblock on 2nd try");
1da177e4
LT		 1804 goto failed_mount;
1805 }
57e94d86 1806 es = (struct ext3_super_block *)(bh->b_data + offset);
1da177e4
LT		 1807 sbi->s_es = es;
1808 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
AF		 1809 ext3_msg(sb, KERN_ERR,
1810 "error: magic mismatch");
1da177e4
LT		 1811 goto failed_mount;
1812 }
1813 }
1814
1815 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1816
1817 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1818 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1819 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1820 } else {
1821 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1822 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1823 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1824 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1825 (sbi->s_inode_size > blocksize)) {
4cf46b67
AF		 1826 ext3_msg(sb, KERN_ERR,
1827 "error: unsupported inode size: %d",
1da177e4
LT		 1828 sbi->s_inode_size);
1829 goto failed_mount;
1830 }
1831 }
1832 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1833 le32_to_cpu(es->s_log_frag_size);
1834 if (blocksize != sbi->s_frag_size) {
4cf46b67
AF		 1835 ext3_msg(sb, KERN_ERR,
1836 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1837 sbi->s_frag_size, blocksize);
1838 goto failed_mount;
1839 }
1840 sbi->s_frags_per_block = 1;
1841 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1842 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1843 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1844 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1845 goto cantfind_ext3;
1846 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1847 if (sbi->s_inodes_per_block == 0)
1848 goto cantfind_ext3;
1849 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1850 sbi->s_inodes_per_block;
1851 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1852 sbi->s_sbh = bh;
1853 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1854 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1855 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1856 for (i=0; i < 4; i++)
1857 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1858 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1859 i = le32_to_cpu(es->s_flags);
1860 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1861 sbi->s_hash_unsigned = 3;
1862 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1863#ifdef __CHAR_UNSIGNED__
1864 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1865 sbi->s_hash_unsigned = 3;
1866#else
1867 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1868#endif
5e1f8c9e 1869 }
1da177e4
LT		 1870
1871 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
AF		 1872 ext3_msg(sb, KERN_ERR,
1873 "#blocks per group too big: %lu",
1da177e4
LT		 1874 sbi->s_blocks_per_group);
1875 goto failed_mount;
1876 }
1877 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
AF		 1878 ext3_msg(sb, KERN_ERR,
1879 "error: #fragments per group too big: %lu",
1da177e4
LT		 1880 sbi->s_frags_per_group);
1881 goto failed_mount;
1882 }
1883 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
AF		 1884 ext3_msg(sb, KERN_ERR,
1885 "error: #inodes per group too big: %lu",
1da177e4
LT		 1886 sbi->s_inodes_per_group);
1887 goto failed_mount;
1888 }
1889
ad692bf3
DW		 1890 err = generic_check_addressable(sb->s_blocksize_bits,
1891 le32_to_cpu(es->s_blocks_count));
1892 if (err) {
4cf46b67
AF		 1893 ext3_msg(sb, KERN_ERR,
1894 "error: filesystem is too large to mount safely");
fcd5df35 1895 if (sizeof(sector_t) < 8)
4cf46b67
AF		 1896 ext3_msg(sb, KERN_ERR,
1897 "error: CONFIG_LBDAF not enabled");
ad692bf3 1898 ret = err;
fcd5df35
MC		 1899 goto failed_mount;
1900 }
1901
1da177e4
LT		 1902 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1903 goto cantfind_ext3;
855565e8
ES		 1904 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1905 le32_to_cpu(es->s_first_data_block) - 1)
1906 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
81a4e320 1907 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1908 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1909 GFP_KERNEL);
1910 if (sbi->s_group_desc == NULL) {
4cf46b67
AF		 1911 ext3_msg(sb, KERN_ERR,
1912 "error: not enough memory");
4569cd1b 1913 ret = -ENOMEM;
1da177e4
LT		 1914 goto failed_mount;
1915 }
1916
5df096d6 1917 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1918
1919 for (i = 0; i < db_count; i++) {
1920 block = descriptor_loc(sb, logic_sb_block, i);
1921 sbi->s_group_desc[i] = sb_bread(sb, block);
1922 if (!sbi->s_group_desc[i]) {
4cf46b67
AF		 1923 ext3_msg(sb, KERN_ERR,
1924 "error: can't read group descriptor %d", i);
1da177e4
LT		 1925 db_count = i;
1926 goto failed_mount2;
1927 }
1928 }
1929 if (!ext3_check_descriptors (sb)) {
4cf46b67
AF		 1930 ext3_msg(sb, KERN_ERR,
1931 "error: group descriptors corrupted");
1da177e4
LT		 1932 goto failed_mount2;
1933 }
1934 sbi->s_gdb_count = db_count;
1935 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1936 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1937
1da177e4
LT		 1938 /* per fileystem reservation list head & lock */
1939 spin_lock_init(&sbi->s_rsv_window_lock);
1940 sbi->s_rsv_window_root = RB_ROOT;
1941 /* Add a single, static dummy reservation to the start of the
1942 * reservation window list --- it gives us a placeholder for
1943 * append-at-start-of-list which makes the allocation logic
1944 * _much_ simpler. */
1945 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1946 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1948 sbi->s_rsv_window_head.rsv_goal_size = 0;
1949 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1950
1951 /*
1952 * set up enough so that it can read an inode
1953 */
1954 sb->s_op = &ext3_sops;
1955 sb->s_export_op = &ext3_export_ops;
1956 sb->s_xattr = ext3_xattr_handlers;
1957#ifdef CONFIG_QUOTA
1958 sb->s_qcop = &ext3_qctl_operations;
1959 sb->dq_op = &ext3_quota_operations;
1960#endif
03cb5f03 1961 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1da177e4 1962 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 1963 mutex_init(&sbi->s_orphan_lock);
96d2a495 1964 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 1965
1966 sb->s_root = NULL;
1967
1968 needs_recovery = (es->s_last_orphan != 0 ||
1969 EXT3_HAS_INCOMPAT_FEATURE(sb,
1970 EXT3_FEATURE_INCOMPAT_RECOVER));
1971
1972 /*
1973 * The first inode we look at is the journal inode. Don't try
1974 * root first: it may be modified in the journal!
1975 */
1976 if (!test_opt(sb, NOLOAD) &&
1977 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1978 if (ext3_load_journal(sb, es, journal_devnum))
41d1a636 1979 goto failed_mount2;
1da177e4
LT		 1980 } else if (journal_inum) {
1981 if (ext3_create_journal(sb, es, journal_inum))
41d1a636 1982 goto failed_mount2;
1da177e4
LT		 1983 } else {
1984 if (!silent)
4cf46b67
AF		 1985 ext3_msg(sb, KERN_ERR,
1986 "error: no journal found. "
1987 "mounting ext3 over ext2?");
41d1a636
DM		 1988 goto failed_mount2;
1989 }
1990 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1991 ext3_count_free_blocks(sb));
1992 if (!err) {
1993 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1994 ext3_count_free_inodes(sb));
1995 }
1996 if (!err) {
1997 err = percpu_counter_init(&sbi->s_dirs_counter,
1998 ext3_count_dirs(sb));
1999 }
2000 if (err) {
2001 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
4569cd1b 2002 ret = err;
0216bfcf 2003 goto failed_mount3;
1da177e4
LT		 2004 }
2005
2006 /* We have now updated the journal if required, so we can
2007 * validate the data journaling mode. */
2008 switch (test_opt(sb, DATA_FLAGS)) {
2009 case 0:
2010 /* No mode set, assume a default based on the journal
2011 capabilities: ORDERED_DATA if the journal can
2012 cope, else JOURNAL_DATA */
2013 if (journal_check_available_features
2014 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 2015 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 2016 else
2017 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2018 break;
2019
2020 case EXT3_MOUNT_ORDERED_DATA:
2021 case EXT3_MOUNT_WRITEBACK_DATA:
2022 if (!journal_check_available_features
2023 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
AF		 2024 ext3_msg(sb, KERN_ERR,
2025 "error: journal does not support "
2026 "requested data journaling mode");
41d1a636 2027 goto failed_mount3;
1da177e4
LT		 2028 }
2029 default:
2030 break;
2031 }
2032
1da177e4
LT		 2033 /*
2034 * The journal_load will have done any necessary log recovery,
2035 * so we can safely mount the rest of the filesystem now.
2036 */
2037
473043dc
DH		 2038 root = ext3_iget(sb, EXT3_ROOT_INO);
2039 if (IS_ERR(root)) {
4cf46b67 2040 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 2041 ret = PTR_ERR(root);
41d1a636 2042 goto failed_mount3;
1da177e4
LT		 2043 }
2044 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2045 iput(root);
4cf46b67 2046 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
41d1a636 2047 goto failed_mount3;
1da177e4 2048 }
48fde701 2049 sb->s_root = d_make_root(root);
473043dc 2050 if (!sb->s_root) {
4cf46b67 2051 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc 2052 ret = -ENOMEM;
41d1a636 2053 goto failed_mount3;
473043dc 2054 }
1da177e4 2055
f007dbf8
ES		 2056 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2057 sb->s_flags |= MS_RDONLY;
ed505ee4 2058
1da177e4
LT		 2059 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2060 ext3_orphan_cleanup(sb, es);
2061 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
63894ab9
EG		 2062 if (needs_recovery) {
2063 ext3_mark_recovery_complete(sb, es);
4cf46b67 2064 ext3_msg(sb, KERN_INFO, "recovery complete");
63894ab9 2065 }
4cf46b67 2066 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2067 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2068 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2069 "writeback");
ffecfd1a 2070 sb->s_flags |= MS_SNAP_STABLE;
1da177e4 2071
1da177e4
LT		 2072 return 0;
2073
2074cantfind_ext3:
2075 if (!silent)
4cf46b67
AF		 2076 ext3_msg(sb, KERN_INFO,
2077 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2078 sb->s_id);
2079 goto failed_mount;
2080
0216bfcf
MC		 2081failed_mount3:
2082 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2083 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2084 percpu_counter_destroy(&sbi->s_dirs_counter);
41d1a636 2085 journal_destroy(sbi->s_journal);
1da177e4
LT		 2086failed_mount2:
2087 for (i = 0; i < db_count; i++)
2088 brelse(sbi->s_group_desc[i]);
2089 kfree(sbi->s_group_desc);
2090failed_mount:
2091#ifdef CONFIG_QUOTA
2092 for (i = 0; i < MAXQUOTAS; i++)
2093 kfree(sbi->s_qf_names[i]);
2094#endif
2095 ext3_blkdev_remove(sbi);
2096 brelse(bh);
2097out_fail:
2098 sb->s_fs_info = NULL;
de5ce037 2099 kfree(sbi->s_blockgroup_lock);
1da177e4 2100 kfree(sbi);
473043dc 2101 return ret;
1da177e4
LT		 2102}
2103
2104/*
2105 * Setup any per-fs journal parameters now. We'll do this both on
2106 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2107 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2108 */
2109static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2110{
2111 struct ext3_sb_info *sbi = EXT3_SB(sb);
2112
2113 if (sbi->s_commit_interval)
2114 journal->j_commit_interval = sbi->s_commit_interval;
2115 /* We could also set up an ext3-specific default for the commit
2116 * interval here, but for now we'll just fall back to the jbd
2117 * default. */
2118
2119 spin_lock(&journal->j_state_lock);
2120 if (test_opt(sb, BARRIER))
2121 journal->j_flags |= JFS_BARRIER;
2122 else
2123 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2124 if (test_opt(sb, DATA_ERR_ABORT))
2125 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2126 else
2127 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2128 spin_unlock(&journal->j_state_lock);
2129}
2130
eee194e7
ES		 2131static journal_t *ext3_get_journal(struct super_block *sb,
2132 unsigned int journal_inum)
1da177e4
LT		 2133{
2134 struct inode *journal_inode;
2135 journal_t *journal;
2136
2137 /* First, test for the existence of a valid inode on disk. Bad
2138 * things happen if we iget() an unused inode, as the subsequent
2139 * iput() will try to delete it. */
2140
473043dc
DH		 2141 journal_inode = ext3_iget(sb, journal_inum);
2142 if (IS_ERR(journal_inode)) {
4cf46b67 2143 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2144 return NULL;
2145 }
2146 if (!journal_inode->i_nlink) {
2147 make_bad_inode(journal_inode);
2148 iput(journal_inode);
4cf46b67 2149 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2150 return NULL;
2151 }
2152
2153 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2154 journal_inode, journal_inode->i_size);
473043dc 2155 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2156 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2157 iput(journal_inode);
2158 return NULL;
2159 }
2160
2161 journal = journal_init_inode(journal_inode);
2162 if (!journal) {
4cf46b67 2163 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2164 iput(journal_inode);
2165 return NULL;
2166 }
2167 journal->j_private = sb;
2168 ext3_init_journal_params(sb, journal);
2169 return journal;
2170}
2171
2172static journal_t *ext3_get_dev_journal(struct super_block *sb,
2173 dev_t j_dev)
2174{
2175 struct buffer_head * bh;
2176 journal_t *journal;
43d23f90 2177 ext3_fsblk_t start;
1c2bf374 2178 ext3_fsblk_t len;
1da177e4 2179 int hblock, blocksize;
43d23f90 2180 ext3_fsblk_t sb_block;
1da177e4
LT		 2181 unsigned long offset;
2182 struct ext3_super_block * es;
2183 struct block_device *bdev;
2184
4cf46b67 2185 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2186 if (bdev == NULL)
2187 return NULL;
2188
1da177e4 2189 blocksize = sb->s_blocksize;
e1defc4f 2190 hblock = bdev_logical_block_size(bdev);
1da177e4 2191 if (blocksize < hblock) {
4cf46b67
AF		 2192 ext3_msg(sb, KERN_ERR,
2193 "error: blocksize too small for journal device");
1da177e4
LT		 2194 goto out_bdev;
2195 }
2196
2197 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2198 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2199 set_blocksize(bdev, blocksize);
2200 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
AF		 2201 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2202 "external journal");
1da177e4
LT		 2203 goto out_bdev;
2204 }
2205
57e94d86 2206 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 2207 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2208 !(le32_to_cpu(es->s_feature_incompat) &
2209 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
AF		 2210 ext3_msg(sb, KERN_ERR, "error: external journal has "
2211 "bad superblock");
1da177e4
LT		 2212 brelse(bh);
2213 goto out_bdev;
2214 }
2215
2216 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2217 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2218 brelse(bh);
2219 goto out_bdev;
2220 }
2221
2222 len = le32_to_cpu(es->s_blocks_count);
2223 start = sb_block + 1;
2224 brelse(bh); /* we're done with the superblock */
2225
2226 journal = journal_init_dev(bdev, sb->s_bdev,
2227 start, len, blocksize);
2228 if (!journal) {
4cf46b67
AF		 2229 ext3_msg(sb, KERN_ERR,
2230 "error: failed to create device journal");
1da177e4
LT		 2231 goto out_bdev;
2232 }
2233 journal->j_private = sb;
d03e1292
ZL		 2234 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2235 if (bh_submit_read(journal->j_sb_buffer)) {
2236 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2237 goto out_journal;
2238 }
1da177e4
LT		 2239 }
2240 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
AF		 2241 ext3_msg(sb, KERN_ERR,
2242 "error: external journal has more than one "
2243 "user (unsupported) - %d",
1da177e4
LT		 2244 be32_to_cpu(journal->j_superblock->s_nr_users));
2245 goto out_journal;
2246 }
2247 EXT3_SB(sb)->journal_bdev = bdev;
2248 ext3_init_journal_params(sb, journal);
2249 return journal;
2250out_journal:
2251 journal_destroy(journal);
2252out_bdev:
2253 ext3_blkdev_put(bdev);
2254 return NULL;
2255}
2256
71b96257
JL		 2257static int ext3_load_journal(struct super_block *sb,
2258 struct ext3_super_block *es,
2259 unsigned long journal_devnum)
1da177e4
LT		 2260{
2261 journal_t *journal;
eee194e7 2262 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2263 dev_t journal_dev;
1da177e4
LT		 2264 int err = 0;
2265 int really_read_only;
2266
71b96257
JL		 2267 if (journal_devnum &&
2268 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
AF		 2269 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2270 "numbers have changed");
71b96257
JL		 2271 journal_dev = new_decode_dev(journal_devnum);
2272 } else
2273 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2274
1da177e4
LT		 2275 really_read_only = bdev_read_only(sb->s_bdev);
2276
2277 /*
2278 * Are we loading a blank journal or performing recovery after a
2279 * crash? For recovery, we need to check in advance whether we
2280 * can get read-write access to the device.
2281 */
2282
2283 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2284 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2285 ext3_msg(sb, KERN_INFO,
2286 "recovery required on readonly filesystem");
1da177e4 2287 if (really_read_only) {
4cf46b67
AF		 2288 ext3_msg(sb, KERN_ERR, "error: write access "
2289 "unavailable, cannot proceed");
1da177e4
LT		 2290 return -EROFS;
2291 }
4cf46b67
AF		 2292 ext3_msg(sb, KERN_INFO,
2293 "write access will be enabled during recovery");
1da177e4
LT		 2294 }
2295 }
2296
2297 if (journal_inum && journal_dev) {
4cf46b67
AF		 2298 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2299 "and inode journals");
1da177e4
LT		 2300 return -EINVAL;
2301 }
2302
2303 if (journal_inum) {
2304 if (!(journal = ext3_get_journal(sb, journal_inum)))
2305 return -EINVAL;
2306 } else {
2307 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2308 return -EINVAL;
2309 }
2310
0636c73e
ES		 2311 if (!(journal->j_flags & JFS_BARRIER))
2312 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2313
1da177e4
LT		 2314 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2315 err = journal_update_format(journal);
2316 if (err) {
4cf46b67 2317 ext3_msg(sb, KERN_ERR, "error updating journal");
1da177e4
LT		 2318 journal_destroy(journal);
2319 return err;
2320 }
2321 }
2322
2323 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2324 err = journal_wipe(journal, !really_read_only);
2325 if (!err)
2326 err = journal_load(journal);
2327
2328 if (err) {
4cf46b67 2329 ext3_msg(sb, KERN_ERR, "error loading journal");
1da177e4
LT		 2330 journal_destroy(journal);
2331 return err;
2332 }
2333
2334 EXT3_SB(sb)->s_journal = journal;
2335 ext3_clear_journal_err(sb, es);
71b96257 2336
31d710a7 2337 if (!really_read_only && journal_devnum &&
71b96257
JL		 2338 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2339 es->s_journal_dev = cpu_to_le32(journal_devnum);
71b96257
JL		 2340
2341 /* Make sure we flush the recovery flag to disk. */
2342 ext3_commit_super(sb, es, 1);
2343 }
2344
1da177e4
LT		 2345 return 0;
2346}
2347
4cf46b67
AF		 2348static int ext3_create_journal(struct super_block *sb,
2349 struct ext3_super_block *es,
eee194e7 2350 unsigned int journal_inum)
1da177e4
LT		 2351{
2352 journal_t *journal;
952d9de1 2353 int err;
1da177e4
LT		 2354
2355 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2356 ext3_msg(sb, KERN_ERR,
2357 "error: readonly filesystem when trying to "
2358 "create journal");
1da177e4
LT		 2359 return -EROFS;
2360 }
2361
952d9de1
BP		 2362 journal = ext3_get_journal(sb, journal_inum);
2363 if (!journal)
1da177e4
LT		 2364 return -EINVAL;
2365
4cf46b67 2366 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
1da177e4
LT		 2367 journal_inum);
2368
952d9de1
BP		 2369 err = journal_create(journal);
2370 if (err) {
4cf46b67 2371 ext3_msg(sb, KERN_ERR, "error creating journal");
1da177e4
LT		 2372 journal_destroy(journal);
2373 return -EIO;
2374 }
2375
2376 EXT3_SB(sb)->s_journal = journal;
2377
2378 ext3_update_dynamic_rev(sb);
2379 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2380 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2381
2382 es->s_journal_inum = cpu_to_le32(journal_inum);
1da177e4
LT		 2383
2384 /* Make sure we flush the recovery flag to disk. */
2385 ext3_commit_super(sb, es, 1);
2386
2387 return 0;
2388}
2389
c4be0c1d
TS		 2390static int ext3_commit_super(struct super_block *sb,
2391 struct ext3_super_block *es,
1da177e4
LT		 2392 int sync)
2393{
2394 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2395 int error = 0;
1da177e4
LT		 2396
2397 if (!sbh)
c4be0c1d 2398 return error;
dff6825e
DW		 2399
2400 if (buffer_write_io_error(sbh)) {
2401 /*
2402 * Oh, dear. A previous attempt to write the
2403 * superblock failed. This could happen because the
2404 * USB device was yanked out. Or it could happen to
2405 * be a transient write error and maybe the block will
2406 * be remapped. Nothing we can do but to retry the
2407 * write and hope for the best.
2408 */
2409 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2410 "superblock detected");
2411 clear_buffer_write_io_error(sbh);
2412 set_buffer_uptodate(sbh);
2413 }
96ec2e0a
TT		 2414 /*
2415 * If the file system is mounted read-only, don't update the
2416 * superblock write time. This avoids updating the superblock
2417 * write time when we are mounting the root file system
2418 * read/only but we need to replay the journal; at that point,
2419 * for people who are east of GMT and who make their clock
2420 * tick in localtime for Windows bug-for-bug compatibility,
2421 * the clock is set in the future, and this will cause e2fsck
2422 * to complain and force a full file system check.
2423 */
2424 if (!(sb->s_flags & MS_RDONLY))
2425 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2426 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2427 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2428 BUFFER_TRACE(sbh, "marking dirty");
2429 mark_buffer_dirty(sbh);
dff6825e 2430 if (sync) {
c4be0c1d 2431 error = sync_dirty_buffer(sbh);
dff6825e
DW		 2432 if (buffer_write_io_error(sbh)) {
2433 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2434 "superblock");
2435 clear_buffer_write_io_error(sbh);
2436 set_buffer_uptodate(sbh);
2437 }
2438 }
c4be0c1d 2439 return error;
1da177e4
LT		 2440}
2441
2442
2443/*
2444 * Have we just finished recovery? If so, and if we are mounting (or
2445 * remounting) the filesystem readonly, then we will end up with a
2446 * consistent fs on disk. Record that fact.
2447 */
2448static void ext3_mark_recovery_complete(struct super_block * sb,
2449 struct ext3_super_block * es)
2450{
2451 journal_t *journal = EXT3_SB(sb)->s_journal;
2452
2453 journal_lock_updates(journal);
2d7c820e
HK		 2454 if (journal_flush(journal) < 0)
2455 goto out;
2456
1da177e4
LT		 2457 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2458 sb->s_flags & MS_RDONLY) {
2459 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2460 ext3_commit_super(sb, es, 1);
2461 }
2d7c820e
HK		 2462
2463out:
1da177e4
LT		 2464 journal_unlock_updates(journal);
2465}
2466
2467/*
2468 * If we are mounting (or read-write remounting) a filesystem whose journal
2469 * has recorded an error from a previous lifetime, move that error to the
2470 * main filesystem now.
2471 */
4cf46b67
AF		 2472static void ext3_clear_journal_err(struct super_block *sb,
2473 struct ext3_super_block *es)
1da177e4
LT		 2474{
2475 journal_t *journal;
2476 int j_errno;
2477 const char *errstr;
2478
2479 journal = EXT3_SB(sb)->s_journal;
2480
2481 /*
2482 * Now check for any error status which may have been recorded in the
2483 * journal by a prior ext3_error() or ext3_abort()
2484 */
2485
2486 j_errno = journal_errno(journal);
2487 if (j_errno) {
2488 char nbuf[16];
2489
2490 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2491 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2492 "from previous mount: %s", errstr);
e05b6b52 2493 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2494 "filesystem check.");
2495
2496 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2497 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2498 ext3_commit_super (sb, es, 1);
2499
2500 journal_clear_err(journal);
2501 }
2502}
2503
2504/*
2505 * Force the running and committing transactions to commit,
2506 * and wait on the commit.
2507 */
2508int ext3_force_commit(struct super_block *sb)
2509{
2510 journal_t *journal;
2511 int ret;
2512
2513 if (sb->s_flags & MS_RDONLY)
2514 return 0;
2515
2516 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2517 ret = ext3_journal_force_commit(journal);
2518 return ret;
2519}
2520
1da177e4
LT		 2521static int ext3_sync_fs(struct super_block *sb, int wait)
2522{
02ac597c 2523 tid_t target;
c87591b7 2524
785c4bcc 2525 trace_ext3_sync_fs(sb, wait);
a1177825
JK		 2526 /*
2527 * Writeback quota in non-journalled quota case - journalled quota has
2528 * no dirty dquots
2529 */
2530 dquot_writeback_dquots(sb, -1);
02ac597c
JK		 2531 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2532 if (wait)
2533 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2534 }
1da177e4
LT		 2535 return 0;
2536}
2537
2538/*
2539 * LVM calls this function before a (read-only) snapshot is created. This
2540 * gives us a chance to flush the journal completely and mark the fs clean.
2541 */
c4be0c1d 2542static int ext3_freeze(struct super_block *sb)
1da177e4 2543{
c4be0c1d
TS		 2544 int error = 0;
2545 journal_t *journal;
1da177e4
LT		 2546
2547 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2548 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2549
2550 /* Now we set up the journal barrier. */
2551 journal_lock_updates(journal);
2d7c820e
HK		 2552
2553 /*
2554 * We don't want to clear needs_recovery flag when we failed
2555 * to flush the journal.
2556 */
c4be0c1d
TS		 2557 error = journal_flush(journal);
2558 if (error < 0)
2559 goto out;
1da177e4
LT		 2560
2561 /* Journal blocked and flushed, clear needs_recovery flag. */
2562 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2563 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2564 if (error)
2565 goto out;
1da177e4 2566 }
c4be0c1d
TS		 2567 return 0;
2568
2569out:
2570 journal_unlock_updates(journal);
2571 return error;
1da177e4
LT		 2572}
2573
2574/*
2575 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2576 * flag here, even though the filesystem is not technically dirty yet.
2577 */
c4be0c1d 2578static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2579{
2580 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 2581 /* Reser the needs_recovery flag before the fs is unlocked. */
2582 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2583 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
1da177e4
LT		 2584 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2585 }
c4be0c1d 2586 return 0;
1da177e4
LT		 2587}
2588
2589static int ext3_remount (struct super_block * sb, int * flags, char * data)
2590{
2591 struct ext3_super_block * es;
2592 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2593 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2594 unsigned long old_sb_flags;
2595 struct ext3_mount_options old_opts;
c79d967d 2596 int enable_quota = 0;
08c6a96f
JK		 2597 int err;
2598#ifdef CONFIG_QUOTA
2599 int i;
2600#endif
2601
2602 /* Store the original options */
2603 old_sb_flags = sb->s_flags;
2604 old_opts.s_mount_opt = sbi->s_mount_opt;
2605 old_opts.s_resuid = sbi->s_resuid;
2606 old_opts.s_resgid = sbi->s_resgid;
2607 old_opts.s_commit_interval = sbi->s_commit_interval;
2608#ifdef CONFIG_QUOTA
2609 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2610 for (i = 0; i < MAXQUOTAS; i++)
f56426ae
JK		 2611 if (sbi->s_qf_names[i]) {
2612 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2613 GFP_KERNEL);
2614 if (!old_opts.s_qf_names[i]) {
2615 int j;
2616
2617 for (j = 0; j < i; j++)
2618 kfree(old_opts.s_qf_names[j]);
2619 return -ENOMEM;
2620 }
2621 } else
2622 old_opts.s_qf_names[i] = NULL;
08c6a96f 2623#endif
1da177e4
LT		 2624
2625 /*
2626 * Allow the "check" option to be passed as a remount option.
2627 */
71b96257 2628 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2629 err = -EINVAL;
2630 goto restore_opts;
2631 }
1da177e4 2632
e3c96435 2633 if (test_opt(sb, ABORT))
e05b6b52 2634 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2635
2636 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 2637 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 2638
2639 es = sbi->s_es;
2640
2641 ext3_init_journal_params(sb, sbi->s_journal);
2642
2643 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2644 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
e3c96435 2645 if (test_opt(sb, ABORT)) {
08c6a96f
JK		 2646 err = -EROFS;
2647 goto restore_opts;
2648 }
1da177e4
LT		 2649
2650 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 2651 err = dquot_suspend(sb, -1);
2652 if (err < 0)
c79d967d 2653 goto restore_opts;
c79d967d 2654
1da177e4
LT		 2655 /*
2656 * First of all, the unconditional stuff we have to do
2657 * to disable replay of the journal when we next remount
2658 */
2659 sb->s_flags |= MS_RDONLY;
2660
2661 /*
2662 * OK, test if we are remounting a valid rw partition
2663 * readonly, and if so set the rdonly flag and then
2664 * mark the partition as valid again.
2665 */
2666 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2667 (sbi->s_mount_state & EXT3_VALID_FS))
2668 es->s_state = cpu_to_le16(sbi->s_mount_state);
2669
2670 ext3_mark_recovery_complete(sb, es);
2671 } else {
2672 __le32 ret;
2673 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2674 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
AF		 2675 ext3_msg(sb, KERN_WARNING,
2676 "warning: couldn't remount RDWR "
2677 "because of unsupported optional "
2678 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2679 err = -EROFS;
2680 goto restore_opts;
1da177e4 2681 }
ea9a05a1
ES		 2682
2683 /*
2684 * If we have an unprocessed orphan list hanging
2685 * around from a previously readonly bdev mount,
1cde201d 2686 * require a full umount & mount for now.
ea9a05a1
ES		 2687 */
2688 if (es->s_last_orphan) {
4cf46b67 2689 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2690 "remount RDWR because of unprocessed "
2691 "orphan inode list. Please "
1cde201d 2692 "umount & mount instead.");
ea9a05a1
ES		 2693 err = -EINVAL;
2694 goto restore_opts;
2695 }
2696
1da177e4
LT		 2697 /*
2698 * Mounting a RDONLY partition read-write, so reread
2699 * and store the current valid flag. (It may have
2700 * been changed by e2fsck since we originally mounted
2701 * the partition.)
2702 */
2703 ext3_clear_journal_err(sb, es);
2704 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2705 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2706 goto restore_opts;
1da177e4
LT		 2707 if (!ext3_setup_super (sb, es, 0))
2708 sb->s_flags &= ~MS_RDONLY;
c79d967d 2709 enable_quota = 1;
1da177e4
LT		 2710 }
2711 }
08c6a96f
JK		 2712#ifdef CONFIG_QUOTA
2713 /* Release old quota file names */
2714 for (i = 0; i < MAXQUOTAS; i++)
f56426ae 2715 kfree(old_opts.s_qf_names[i]);
08c6a96f 2716#endif
c79d967d 2717 if (enable_quota)
0f0dd62f 2718 dquot_resume(sb, -1);
1da177e4 2719 return 0;
08c6a96f
JK		 2720restore_opts:
2721 sb->s_flags = old_sb_flags;
2722 sbi->s_mount_opt = old_opts.s_mount_opt;
2723 sbi->s_resuid = old_opts.s_resuid;
2724 sbi->s_resgid = old_opts.s_resgid;
2725 sbi->s_commit_interval = old_opts.s_commit_interval;
2726#ifdef CONFIG_QUOTA
2727 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2728 for (i = 0; i < MAXQUOTAS; i++) {
f56426ae 2729 kfree(sbi->s_qf_names[i]);
08c6a96f
JK		 2730 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2731 }
2732#endif
2733 return err;
1da177e4
LT		 2734}
2735
726c3342 2736static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2737{
726c3342 2738 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2739 struct ext3_sb_info *sbi = EXT3_SB(sb);
2740 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2741 u64 fsid;
1da177e4 2742
a71ce8c6
BP		 2743 if (test_opt(sb, MINIX_DF)) {
2744 sbi->s_overhead_last = 0;
2745 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2746 unsigned long ngroups = sbi->s_groups_count, i;
2747 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2748 smp_rmb();
2749
2750 /*
a71ce8c6
BP		 2751 * Compute the overhead (FS structures). This is constant
2752 * for a given filesystem unless the number of block groups
2753 * changes so we cache the previous value until it does.
1da177e4
LT		 2754 */
2755
2756 /*
2757 * All of the blocks before first_data_block are
2758 * overhead
2759 */
2760 overhead = le32_to_cpu(es->s_first_data_block);
2761
2762 /*
2763 * Add the overhead attributed to the superblock and
2764 * block group descriptors. If the sparse superblocks
2765 * feature is turned on, then not all groups have this.
2766 */
2767 for (i = 0; i < ngroups; i++) {
2768 overhead += ext3_bg_has_super(sb, i) +
2769 ext3_bg_num_gdb(sb, i);
2770 cond_resched();
2771 }
2772
2773 /*
2774 * Every block group has an inode bitmap, a block
2775 * bitmap, and an inode table.
2776 */
a71ce8c6
BP		 2777 overhead += ngroups * (2 + sbi->s_itb_per_group);
2778 sbi->s_overhead_last = overhead;
2779 smp_wmb();
2780 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2781 }
2782
2783 buf->f_type = EXT3_SUPER_MAGIC;
2784 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2785 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2786 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2787 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2788 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2789 buf->f_bavail = 0;
2790 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2791 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2792 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2793 fsid = le64_to_cpup((void *)es->s_uuid) ^
2794 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2795 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2796 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2797 return 0;
2798}
2799
2800/* Helper function for writing quotas on sync - we need to start transaction before quota file
2801 * is locked for write. Otherwise the are possible deadlocks:
2802 * Process 1 Process 2
2803 * ext3_create() quota_sync()
2804 * journal_start() write_dquot()
871a2931 2805 * dquot_initialize() down(dqio_mutex)
d3be915f 2806 * down(dqio_mutex) journal_start()
1da177e4
LT		 2807 *
2808 */
2809
2810#ifdef CONFIG_QUOTA
2811
2812static inline struct inode *dquot_to_inode(struct dquot *dquot)
2813{
4c376dca 2814 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
1da177e4
LT		 2815}
2816
1da177e4
LT		 2817static int ext3_write_dquot(struct dquot *dquot)
2818{
2819 int ret, err;
2820 handle_t *handle;
2821 struct inode *inode;
2822
2823 inode = dquot_to_inode(dquot);
2824 handle = ext3_journal_start(inode,
1f54587b 2825 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2826 if (IS_ERR(handle))
2827 return PTR_ERR(handle);
2828 ret = dquot_commit(dquot);
2829 err = ext3_journal_stop(handle);
2830 if (!ret)
2831 ret = err;
2832 return ret;
2833}
2834
2835static int ext3_acquire_dquot(struct dquot *dquot)
2836{
2837 int ret, err;
2838 handle_t *handle;
2839
2840 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2841 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2842 if (IS_ERR(handle))
2843 return PTR_ERR(handle);
2844 ret = dquot_acquire(dquot);
2845 err = ext3_journal_stop(handle);
2846 if (!ret)
2847 ret = err;
2848 return ret;
2849}
2850
2851static int ext3_release_dquot(struct dquot *dquot)
2852{
2853 int ret, err;
2854 handle_t *handle;
2855
2856 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2857 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2858 if (IS_ERR(handle)) {
2859 /* Release dquot anyway to avoid endless cycle in dqput() */
2860 dquot_release(dquot);
1da177e4 2861 return PTR_ERR(handle);
9c3013e9 2862 }
1da177e4
LT		 2863 ret = dquot_release(dquot);
2864 err = ext3_journal_stop(handle);
2865 if (!ret)
2866 ret = err;
2867 return ret;
2868}
2869
2870static int ext3_mark_dquot_dirty(struct dquot *dquot)
2871{
99aeaf63 2872 /* Are we journaling quotas? */
1da177e4
LT		 2873 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2874 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2875 dquot_mark_dquot_dirty(dquot);
2876 return ext3_write_dquot(dquot);
2877 } else {
2878 return dquot_mark_dquot_dirty(dquot);
2879 }
2880}
2881
2882static int ext3_write_info(struct super_block *sb, int type)
2883{
2884 int ret, err;
2885 handle_t *handle;
2886
2887 /* Data block + inode block */
2888 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2889 if (IS_ERR(handle))
2890 return PTR_ERR(handle);
2891 ret = dquot_commit_info(sb, type);
2892 err = ext3_journal_stop(handle);
2893 if (!ret)
2894 ret = err;
2895 return ret;
2896}
2897
2898/*
2899 * Turn on quotas during mount time - we need to find
2900 * the quota file and such...
2901 */
2902static int ext3_quota_on_mount(struct super_block *sb, int type)
2903{
287a8095
CH		 2904 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2905 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2906}
2907
2908/*
2909 * Standard function to be called on quota_on
2910 */
2911static int ext3_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 2912 struct path *path)
1da177e4
LT		 2913{
2914 int err;
1da177e4 2915
1f54587b
JK		 2916 if (!test_opt(sb, QUOTA))
2917 return -EINVAL;
9cfe7b90 2918
1da177e4 2919 /* Quotafile not on the same filesystem? */
d8c9584e 2920 if (path->dentry->d_sb != sb)
1da177e4 2921 return -EXDEV;
9cfe7b90
JK		 2922 /* Journaling quota? */
2923 if (EXT3_SB(sb)->s_qf_names[type]) {
2924 /* Quotafile not of fs root? */
f00c9e44 2925 if (path->dentry->d_parent != sb->s_root)
4cf46b67
AF		 2926 ext3_msg(sb, KERN_WARNING,
2927 "warning: Quota file not on filesystem root. "
2928 "Journaled quota will not work.");
9cfe7b90
JK		 2929 }
2930
2931 /*
2932 * When we journal data on quota file, we have to flush journal to see
2933 * all updates to the file when we bypass pagecache...
2934 */
f00c9e44 2935 if (ext3_should_journal_data(path->dentry->d_inode)) {
9cfe7b90
JK		 2936 /*
2937 * We don't need to lock updates but journal_flush() could
2938 * otherwise be livelocked...
2939 */
2940 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2941 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2942 journal_unlock_updates(EXT3_SB(sb)->s_journal);
f00c9e44 2943 if (err)
2d7c820e 2944 return err;
9cfe7b90
JK		 2945 }
2946
f00c9e44 2947 return dquot_quota_on(sb, type, format_id, path);
1da177e4
LT		 2948}
2949
2950/* Read data from quotafile - avoid pagecache and such because we cannot afford
2951 * acquiring the locks... As quota files are never truncated and quota code
25985edc 2952 * itself serializes the operations (and no one else should touch the files)
1da177e4
LT		 2953 * we don't have to be afraid of races */
2954static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2955 size_t len, loff_t off)
2956{
2957 struct inode *inode = sb_dqopt(sb)->files[type];
2958 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2959 int err = 0;
2960 int offset = off & (sb->s_blocksize - 1);
2961 int tocopy;
2962 size_t toread;
2963 struct buffer_head *bh;
2964 loff_t i_size = i_size_read(inode);
2965
2966 if (off > i_size)
2967 return 0;
2968 if (off+len > i_size)
2969 len = i_size-off;
2970 toread = len;
2971 while (toread > 0) {
2972 tocopy = sb->s_blocksize - offset < toread ?
2973 sb->s_blocksize - offset : toread;
2974 bh = ext3_bread(NULL, inode, blk, 0, &err);
2975 if (err)
2976 return err;
2977 if (!bh) /* A hole? */
2978 memset(data, 0, tocopy);
2979 else
2980 memcpy(data, bh->b_data+offset, tocopy);
2981 brelse(bh);
2982 offset = 0;
2983 toread -= tocopy;
2984 data += tocopy;
2985 blk++;
2986 }
2987 return len;
2988}
2989
2990/* Write to quotafile (we know the transaction is already started and has
2991 * enough credits) */
2992static ssize_t ext3_quota_write(struct super_block *sb, int type,
2993 const char *data, size_t len, loff_t off)
2994{
2995 struct inode *inode = sb_dqopt(sb)->files[type];
2996 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2997 int err = 0;
2998 int offset = off & (sb->s_blocksize - 1);
1da177e4 2999 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
1da177e4
LT		 3000 struct buffer_head *bh;
3001 handle_t *handle = journal_current_handle();
3002
9c3013e9 3003 if (!handle) {
4cf46b67
AF		 3004 ext3_msg(sb, KERN_WARNING,
3005 "warning: quota write (off=%llu, len=%llu)"
3006 " cancelled because transaction is not started.",
9c3013e9
JK		 3007 (unsigned long long)off, (unsigned long long)len);
3008 return -EIO;
3009 }
e5472147
DM		 3010
3011 /*
3012 * Since we account only one data block in transaction credits,
3013 * then it is impossible to cross a block boundary.
3014 */
3015 if (sb->s_blocksize - offset < len) {
3016 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3017 " cancelled because not block aligned",
3018 (unsigned long long)off, (unsigned long long)len);
3019 return -EIO;
3020 }
e5472147
DM		 3021 bh = ext3_bread(handle, inode, blk, 1, &err);
3022 if (!bh)
3023 goto out;
3024 if (journal_quota) {
3025 err = ext3_journal_get_write_access(handle, bh);
3026 if (err) {
3027 brelse(bh);
1da177e4 3028 goto out;
1da177e4 3029 }
1da177e4 3030 }
e5472147
DM		 3031 lock_buffer(bh);
3032 memcpy(bh->b_data+offset, data, len);
3033 flush_dcache_page(bh->b_page);
3034 unlock_buffer(bh);
3035 if (journal_quota)
3036 err = ext3_journal_dirty_metadata(handle, bh);
3037 else {
3038 /* Always do at least ordered writes for quotas */
3039 err = ext3_journal_dirty_data(handle, bh);
3040 mark_buffer_dirty(bh);
3041 }
3042 brelse(bh);
1da177e4 3043out:
905c3937 3044 if (err)
1da177e4 3045 return err;
e5472147
DM		 3046 if (inode->i_size < off + len) {
3047 i_size_write(inode, off + len);
1da177e4
LT		 3048 EXT3_I(inode)->i_disksize = inode->i_size;
3049 }
3050 inode->i_version++;
3051 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3052 ext3_mark_inode_dirty(handle, inode);
e5472147 3053 return len;
1da177e4
LT		 3054}
3055
3056#endif
3057
152a0836
AV		 3058static struct dentry *ext3_mount(struct file_system_type *fs_type,
3059 int flags, const char *dev_name, void *data)
1da177e4 3060{
152a0836 3061 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
1da177e4
LT		 3062}
3063
3064static struct file_system_type ext3_fs_type = {
3065 .owner = THIS_MODULE,
3066 .name = "ext3",
152a0836 3067 .mount = ext3_mount,
1da177e4
LT		 3068 .kill_sb = kill_block_super,
3069 .fs_flags = FS_REQUIRES_DEV,
3070};
7f78e035 3071MODULE_ALIAS_FS("ext3");
1da177e4
LT		 3072
3073static int __init init_ext3_fs(void)
3074{
3075 int err = init_ext3_xattr();
3076 if (err)
3077 return err;
3078 err = init_inodecache();
3079 if (err)
3080 goto out1;
3081 err = register_filesystem(&ext3_fs_type);
3082 if (err)
3083 goto out;
3084 return 0;
3085out:
3086 destroy_inodecache();
3087out1:
e9ad5620 3088 exit_ext3_xattr();
1da177e4
LT		 3089 return err;
3090}
3091
3092static void __exit exit_ext3_fs(void)
3093{
3094 unregister_filesystem(&ext3_fs_type);
3095 destroy_inodecache();
3096 exit_ext3_xattr();
3097}
3098
3099MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3100MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3101MODULE_LICENSE("GPL");
3102module_init(init_ext3_fs)
3103module_exit(exit_ext3_fs)
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