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Merge remote-tracking branch 'asoc/fix/omap' into asoc-linus
[deliverable/linux.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>
cf7eff46 30#include <linux/namei.h>
381be254 31
1da177e4 32#include <asm/uaccess.h>
381be254 33
4613ad18
AV		 34#define CREATE_TRACE_POINTS
35
36#include "ext3.h"
1da177e4
LT		 37#include "xattr.h"
38#include "acl.h"
381be254 39#include "namei.h"
1da177e4 40
bbae8bcc
LT		 41#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
42 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
43#else
44 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
45#endif
46
71b96257
JL		 47static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
1da177e4 49static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 50 unsigned int);
c4be0c1d
TS		 51static int ext3_commit_super(struct super_block *sb,
52 struct ext3_super_block *es,
1da177e4
LT		 53 int sync);
54static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58static int ext3_sync_fs(struct super_block *sb, int wait);
59static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 62static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 63static int ext3_unfreeze(struct super_block *sb);
c4be0c1d 64static int ext3_freeze(struct super_block *sb);
1da177e4 65
ae6ddcc5 66/*
1da177e4 67 * Wrappers for journal_start/end.
1da177e4
LT		 68 */
69handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
70{
71 journal_t *journal;
72
73 if (sb->s_flags & MS_RDONLY)
74 return ERR_PTR(-EROFS);
75
76 /* Special case here: if the journal has aborted behind our
77 * backs (eg. EIO in the commit thread), then we still need to
78 * take the FS itself readonly cleanly. */
79 journal = EXT3_SB(sb)->s_journal;
80 if (is_journal_aborted(journal)) {
e05b6b52 81 ext3_abort(sb, __func__,
1da177e4
LT		 82 "Detected aborted journal");
83 return ERR_PTR(-EROFS);
84 }
85
86 return journal_start(journal, nblocks);
87}
88
1da177e4
LT		 89int __ext3_journal_stop(const char *where, handle_t *handle)
90{
91 struct super_block *sb;
92 int err;
93 int rc;
94
95 sb = handle->h_transaction->t_journal->j_private;
96 err = handle->h_err;
97 rc = journal_stop(handle);
98
99 if (!err)
100 err = rc;
101 if (err)
102 __ext3_std_error(sb, where, err);
103 return err;
104}
105
106void ext3_journal_abort_handle(const char *caller, const char *err_fn,
107 struct buffer_head *bh, handle_t *handle, int err)
108{
109 char nbuf[16];
110 const char *errstr = ext3_decode_error(NULL, err, nbuf);
111
112 if (bh)
113 BUFFER_TRACE(bh, "abort");
114
115 if (!handle->h_err)
116 handle->h_err = err;
117
118 if (is_handle_aborted(handle))
119 return;
120
4cf46b67
AF		 121 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
122 caller, errstr, err_fn);
1da177e4
LT		 123
124 journal_abort_handle(handle);
125}
126
4cf46b67
AF		 127void ext3_msg(struct super_block *sb, const char *prefix,
128 const char *fmt, ...)
129{
99fbb1e2 130 struct va_format vaf;
4cf46b67
AF		 131 va_list args;
132
133 va_start(args, fmt);
99fbb1e2
JP		 134
135 vaf.fmt = fmt;
136 vaf.va = &args;
137
138 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
139
4cf46b67
AF		 140 va_end(args);
141}
142
1da177e4
LT		 143/* Deal with the reporting of failure conditions on a filesystem such as
144 * inconsistencies detected or read IO failures.
145 *
146 * On ext2, we can store the error state of the filesystem in the
147 * superblock. That is not possible on ext3, because we may have other
148 * write ordering constraints on the superblock which prevent us from
149 * writing it out straight away; and given that the journal is about to
150 * be aborted, we can't rely on the current, or future, transactions to
151 * write out the superblock safely.
152 *
153 * We'll just use the journal_abort() error code to record an error in
d6b198bc 154 * the journal instead. On recovery, the journal will complain about
1da177e4
LT		 155 * that error until we've noted it down and cleared it.
156 */
157
158static void ext3_handle_error(struct super_block *sb)
159{
160 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
161
162 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
163 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
164
165 if (sb->s_flags & MS_RDONLY)
166 return;
167
7543fc7b 168 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 169 journal_t *journal = EXT3_SB(sb)->s_journal;
170
e3c96435 171 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
1da177e4
LT		 172 if (journal)
173 journal_abort(journal, -EIO);
174 }
7543fc7b 175 if (test_opt (sb, ERRORS_RO)) {
4cf46b67
AF		 176 ext3_msg(sb, KERN_CRIT,
177 "error: remounting filesystem read-only");
3df32196
DM		 178 /*
179 * Make sure updated value of ->s_mount_state will be visible
180 * before ->s_flags update.
181 */
182 smp_wmb();
7543fc7b
VA		 183 sb->s_flags |= MS_RDONLY;
184 }
185 ext3_commit_super(sb, es, 1);
1da177e4 186 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 187 panic("EXT3-fs (%s): panic forced after error\n",
1da177e4 188 sb->s_id);
1da177e4
LT		 189}
190
99fbb1e2
JP		 191void ext3_error(struct super_block *sb, const char *function,
192 const char *fmt, ...)
1da177e4 193{
99fbb1e2 194 struct va_format vaf;
1da177e4
LT		 195 va_list args;
196
197 va_start(args, fmt);
99fbb1e2
JP		 198
199 vaf.fmt = fmt;
200 vaf.va = &args;
201
202 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
203 sb->s_id, function, &vaf);
204
1da177e4
LT		 205 va_end(args);
206
207 ext3_handle_error(sb);
208}
209
210static const char *ext3_decode_error(struct super_block * sb, int errno,
211 char nbuf[16])
212{
213 char *errstr = NULL;
214
215 switch (errno) {
216 case -EIO:
217 errstr = "IO failure";
218 break;
219 case -ENOMEM:
220 errstr = "Out of memory";
221 break;
222 case -EROFS:
223 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
224 errstr = "Journal has aborted";
225 else
226 errstr = "Readonly filesystem";
227 break;
228 default:
229 /* If the caller passed in an extra buffer for unknown
230 * errors, textualise them now. Else we just return
231 * NULL. */
232 if (nbuf) {
233 /* Check for truncated error codes... */
234 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
235 errstr = nbuf;
236 }
237 break;
238 }
239
240 return errstr;
241}
242
243/* __ext3_std_error decodes expected errors from journaling functions
244 * automatically and invokes the appropriate error response. */
245
246void __ext3_std_error (struct super_block * sb, const char * function,
247 int errno)
248{
249 char nbuf[16];
30121624 250 const char *errstr;
1da177e4 251
30121624
ST		 252 /* Special case: if the error is EROFS, and we're not already
253 * inside a transaction, then there's really no point in logging
254 * an error. */
255 if (errno == -EROFS && journal_current_handle() == NULL &&
256 (sb->s_flags & MS_RDONLY))
257 return;
258
259 errstr = ext3_decode_error(sb, errno, nbuf);
4cf46b67 260 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
1da177e4
LT		 261
262 ext3_handle_error(sb);
263}
264
265/*
266 * ext3_abort is a much stronger failure handler than ext3_error. The
267 * abort function may be used to deal with unrecoverable failures such
268 * as journal IO errors or ENOMEM at a critical moment in log management.
269 *
270 * We unconditionally force the filesystem into an ABORT|READONLY state,
271 * unless the error response on the fs has been set to panic in which
272 * case we take the easy way out and panic immediately.
273 */
274
99fbb1e2
JP		 275void ext3_abort(struct super_block *sb, const char *function,
276 const char *fmt, ...)
1da177e4 277{
99fbb1e2 278 struct va_format vaf;
1da177e4
LT		 279 va_list args;
280
1da177e4 281 va_start(args, fmt);
99fbb1e2
JP		 282
283 vaf.fmt = fmt;
284 vaf.va = &args;
285
286 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
287 sb->s_id, function, &vaf);
288
1da177e4
LT		 289 va_end(args);
290
291 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 292 panic("EXT3-fs: panic from previous error\n");
1da177e4
LT		 293
294 if (sb->s_flags & MS_RDONLY)
295 return;
296
4cf46b67
AF		 297 ext3_msg(sb, KERN_CRIT,
298 "error: remounting filesystem read-only");
1da177e4 299 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
e3c96435 300 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
3df32196
DM		 301 /*
302 * Make sure updated value of ->s_mount_state will be visible
303 * before ->s_flags update.
304 */
305 smp_wmb();
306 sb->s_flags |= MS_RDONLY;
307
44d6f787
HK		 308 if (EXT3_SB(sb)->s_journal)
309 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 310}
311
99fbb1e2
JP		 312void ext3_warning(struct super_block *sb, const char *function,
313 const char *fmt, ...)
1da177e4 314{
99fbb1e2 315 struct va_format vaf;
1da177e4
LT		 316 va_list args;
317
318 va_start(args, fmt);
99fbb1e2
JP		 319
320 vaf.fmt = fmt;
321 vaf.va = &args;
322
323 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
324 sb->s_id, function, &vaf);
325
1da177e4
LT		 326 va_end(args);
327}
328
329void ext3_update_dynamic_rev(struct super_block *sb)
330{
331 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
332
333 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
334 return;
335
4cf46b67
AF		 336 ext3_msg(sb, KERN_WARNING,
337 "warning: updating to rev %d because of "
338 "new feature flag, running e2fsck is recommended",
339 EXT3_DYNAMIC_REV);
1da177e4
LT		 340
341 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
342 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
343 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
344 /* leave es->s_feature_*compat flags alone */
345 /* es->s_uuid will be set by e2fsck if empty */
346
347 /*
348 * The rest of the superblock fields should be zero, and if not it
349 * means they are likely already in use, so leave them alone. We
350 * can leave it up to e2fsck to clean up any inconsistencies there.
351 */
352}
353
354/*
355 * Open the external journal device
356 */
4cf46b67 357static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
1da177e4
LT		 358{
359 struct block_device *bdev;
360 char b[BDEVNAME_SIZE];
361
d4d77629 362 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
1da177e4
LT		 363 if (IS_ERR(bdev))
364 goto fail;
365 return bdev;
366
367fail:
8d0c2d10 368 ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
4cf46b67
AF		 369 __bdevname(dev, b), PTR_ERR(bdev));
370
1da177e4
LT		 371 return NULL;
372}
373
374/*
375 * Release the journal device
376 */
4385bab1 377static void ext3_blkdev_put(struct block_device *bdev)
1da177e4 378{
4385bab1 379 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT		 380}
381
4385bab1 382static void ext3_blkdev_remove(struct ext3_sb_info *sbi)
1da177e4
LT		 383{
384 struct block_device *bdev;
1da177e4
LT		 385 bdev = sbi->journal_bdev;
386 if (bdev) {
4385bab1 387 ext3_blkdev_put(bdev);
1da177e4
LT		 388 sbi->journal_bdev = NULL;
389 }
1da177e4
LT		 390}
391
392static inline struct inode *orphan_list_entry(struct list_head *l)
393{
394 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
395}
396
397static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
398{
399 struct list_head *l;
400
4cf46b67 401 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
1da177e4
LT		 402 le32_to_cpu(sbi->s_es->s_last_orphan));
403
4cf46b67 404 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
1da177e4
LT		 405 list_for_each(l, &sbi->s_orphan) {
406 struct inode *inode = orphan_list_entry(l);
4cf46b67 407 ext3_msg(sb, KERN_ERR, " "
eee194e7 408 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 409 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 410 inode->i_mode, inode->i_nlink,
1da177e4
LT		 411 NEXT_ORPHAN(inode));
412 }
413}
414
415static void ext3_put_super (struct super_block * sb)
416{
417 struct ext3_sb_info *sbi = EXT3_SB(sb);
418 struct ext3_super_block *es = sbi->s_es;
44d6f787 419 int i, err;
1da177e4 420
e0ccfd95 421 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
1da177e4 422 ext3_xattr_put_super(sb);
44d6f787
HK		 423 err = journal_destroy(sbi->s_journal);
424 sbi->s_journal = NULL;
425 if (err < 0)
2d7c820e 426 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 427
1da177e4
LT		 428 if (!(sb->s_flags & MS_RDONLY)) {
429 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
430 es->s_state = cpu_to_le16(sbi->s_mount_state);
431 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
432 mark_buffer_dirty(sbi->s_sbh);
433 ext3_commit_super(sb, es, 1);
434 }
435
436 for (i = 0; i < sbi->s_gdb_count; i++)
437 brelse(sbi->s_group_desc[i]);
438 kfree(sbi->s_group_desc);
439 percpu_counter_destroy(&sbi->s_freeblocks_counter);
440 percpu_counter_destroy(&sbi->s_freeinodes_counter);
441 percpu_counter_destroy(&sbi->s_dirs_counter);
442 brelse(sbi->s_sbh);
443#ifdef CONFIG_QUOTA
a93114e4 444 for (i = 0; i < EXT3_MAXQUOTAS; i++)
1da177e4
LT		 445 kfree(sbi->s_qf_names[i]);
446#endif
447
448 /* Debugging code just in case the in-memory inode orphan list
449 * isn't empty. The on-disk one can be non-empty if we've
450 * detected an error and taken the fs readonly, but the
451 * in-memory list had better be clean by this point. */
452 if (!list_empty(&sbi->s_orphan))
453 dump_orphan_list(sb, sbi);
454 J_ASSERT(list_empty(&sbi->s_orphan));
455
f98393a6 456 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 457 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
458 /*
459 * Invalidate the journal device's buffers. We don't want them
460 * floating about in memory - the physical journal device may
461 * hotswapped, and it breaks the `ro-after' testing code.
462 */
463 sync_blockdev(sbi->journal_bdev);
f98393a6 464 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 465 ext3_blkdev_remove(sbi);
466 }
467 sb->s_fs_info = NULL;
5df096d6 468 kfree(sbi->s_blockgroup_lock);
6744e90b
FF		 469 mutex_destroy(&sbi->s_orphan_lock);
470 mutex_destroy(&sbi->s_resize_lock);
1da177e4 471 kfree(sbi);
1da177e4
LT		 472}
473
e18b890b 474static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 475
476/*
477 * Called inside transaction, so use GFP_NOFS
478 */
479static struct inode *ext3_alloc_inode(struct super_block *sb)
480{
481 struct ext3_inode_info *ei;
482
e6b4f8da 483 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 484 if (!ei)
485 return NULL;
1da177e4
LT		 486 ei->i_block_alloc_info = NULL;
487 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 488 atomic_set(&ei->i_datasync_tid, 0);
489 atomic_set(&ei->i_sync_tid, 0);
4018cfbc
JK		 490#ifdef CONFIG_QUOTA
491 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
492#endif
493
1da177e4
LT		 494 return &ei->vfs_inode;
495}
496
785c4bcc
LC		 497static int ext3_drop_inode(struct inode *inode)
498{
499 int drop = generic_drop_inode(inode);
500
501 trace_ext3_drop_inode(inode, drop);
502 return drop;
503}
504
fa0d7e3d
NP		 505static void ext3_i_callback(struct rcu_head *head)
506{
507 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 508 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
509}
510
1da177e4
LT		 511static void ext3_destroy_inode(struct inode *inode)
512{
9f7dd93d
VA		 513 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
514 printk("EXT3 Inode %p: orphan list check failed!\n",
515 EXT3_I(inode));
516 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
517 EXT3_I(inode), sizeof(struct ext3_inode_info),
518 false);
519 dump_stack();
520 }
fa0d7e3d 521 call_rcu(&inode->i_rcu, ext3_i_callback);
1da177e4
LT		 522}
523
51cc5068 524static void init_once(void *foo)
1da177e4
LT		 525{
526 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
527
a35afb83 528 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 529#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 530 init_rwsem(&ei->xattr_sem);
1da177e4 531#endif
a35afb83
CL		 532 mutex_init(&ei->truncate_mutex);
533 inode_init_once(&ei->vfs_inode);
1da177e4 534}
ae6ddcc5 535
1da8b822 536static int __init init_inodecache(void)
1da177e4
LT		 537{
538 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
539 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 540 0, (SLAB_RECLAIM_ACCOUNT|
541 SLAB_MEM_SPREAD),
20c2df83 542 init_once);
1da177e4
LT		 543 if (ext3_inode_cachep == NULL)
544 return -ENOMEM;
545 return 0;
546}
547
548static void destroy_inodecache(void)
549{
8c0a8537
KS		 550 /*
551 * Make sure all delayed rcu free inodes are flushed before we
552 * destroy cache.
553 */
554 rcu_barrier();
1a1d92c1 555 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 556}
557
6cd37cda 558static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 559{
6cd37cda 560#if defined(CONFIG_QUOTA)
275abf5b 561 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 562
1aeec434
JK		 563 if (sbi->s_jquota_fmt) {
564 char *fmtname = "";
565
566 switch (sbi->s_jquota_fmt) {
567 case QFMT_VFS_OLD:
568 fmtname = "vfsold";
569 break;
570 case QFMT_VFS_V0:
571 fmtname = "vfsv0";
572 break;
573 case QFMT_VFS_V1:
574 fmtname = "vfsv1";
575 break;
576 }
577 seq_printf(seq, ",jqfmt=%s", fmtname);
578 }
8fc2751b
MB		 579
580 if (sbi->s_qf_names[USRQUOTA])
581 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
582
583 if (sbi->s_qf_names[GRPQUOTA])
584 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
585
e3c96435 586 if (test_opt(sb, USRQUOTA))
8fc2751b
MB		 587 seq_puts(seq, ",usrquota");
588
e3c96435 589 if (test_opt(sb, GRPQUOTA))
8fc2751b
MB		 590 seq_puts(seq, ",grpquota");
591#endif
6cd37cda
PO		 592}
593
3c4cec65
JK		 594static char *data_mode_string(unsigned long mode)
595{
596 switch (mode) {
597 case EXT3_MOUNT_JOURNAL_DATA:
598 return "journal";
599 case EXT3_MOUNT_ORDERED_DATA:
600 return "ordered";
601 case EXT3_MOUNT_WRITEBACK_DATA:
602 return "writeback";
603 }
604 return "unknown";
605}
606
571beed8
MS		 607/*
608 * Show an option if
609 * - it's set to a non-default value OR
610 * - if the per-sb default is different from the global default
611 */
34c80b1d 612static int ext3_show_options(struct seq_file *seq, struct dentry *root)
6cd37cda 613{
34c80b1d 614 struct super_block *sb = root->d_sb;
571beed8
MS		 615 struct ext3_sb_info *sbi = EXT3_SB(sb);
616 struct ext3_super_block *es = sbi->s_es;
617 unsigned long def_mount_opts;
618
619 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
620
621 if (sbi->s_sb_block != 1)
622 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
623 if (test_opt(sb, MINIX_DF))
624 seq_puts(seq, ",minixdf");
625 if (test_opt(sb, GRPID))
626 seq_puts(seq, ",grpid");
627 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
628 seq_puts(seq, ",nogrpid");
1523299d 629 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
571beed8 630 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
1523299d
EB		 631 seq_printf(seq, ",resuid=%u",
632 from_kuid_munged(&init_user_ns, sbi->s_resuid));
571beed8 633 }
1523299d 634 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
571beed8 635 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
1523299d
EB		 636 seq_printf(seq, ",resgid=%u",
637 from_kgid_munged(&init_user_ns, sbi->s_resgid));
571beed8 638 }
1eca93f9 639 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 640 int def_errors = le16_to_cpu(es->s_errors);
641
642 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 643 def_errors == EXT3_ERRORS_CONTINUE) {
644 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 645 }
646 }
1eca93f9
AK		 647 if (test_opt(sb, ERRORS_CONT))
648 seq_puts(seq, ",errors=continue");
571beed8
MS		 649 if (test_opt(sb, ERRORS_PANIC))
650 seq_puts(seq, ",errors=panic");
651 if (test_opt(sb, NO_UID32))
652 seq_puts(seq, ",nouid32");
653 if (test_opt(sb, DEBUG))
654 seq_puts(seq, ",debug");
571beed8
MS		 655#ifdef CONFIG_EXT3_FS_XATTR
656 if (test_opt(sb, XATTR_USER))
657 seq_puts(seq, ",user_xattr");
658 if (!test_opt(sb, XATTR_USER) &&
659 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
660 seq_puts(seq, ",nouser_xattr");
661 }
662#endif
663#ifdef CONFIG_EXT3_FS_POSIX_ACL
664 if (test_opt(sb, POSIX_ACL))
665 seq_puts(seq, ",acl");
666 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
667 seq_puts(seq, ",noacl");
668#endif
669 if (!test_opt(sb, RESERVATION))
670 seq_puts(seq, ",noreservation");
671 if (sbi->s_commit_interval) {
672 seq_printf(seq, ",commit=%u",
673 (unsigned) (sbi->s_commit_interval / HZ));
674 }
0636c73e
ES		 675
676 /*
677 * Always display barrier state so it's clear what the status is.
678 */
679 seq_puts(seq, ",barrier=");
680 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
e3c96435 681 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
0e4fb5e2
HK		 682 if (test_opt(sb, DATA_ERR_ABORT))
683 seq_puts(seq, ",data_err=abort");
684
dee1d3b6
ES		 685 if (test_opt(sb, NOLOAD))
686 seq_puts(seq, ",norecovery");
687
6cd37cda 688 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 689
690 return 0;
691}
1da177e4 692
fdb36673 693
74af0baa
CH		 694static struct inode *ext3_nfs_get_inode(struct super_block *sb,
695 u64 ino, u32 generation)
fdb36673 696{
fdb36673 697 struct inode *inode;
fdb36673
N		 698
699 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
700 return ERR_PTR(-ESTALE);
701 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
702 return ERR_PTR(-ESTALE);
703
704 /* iget isn't really right if the inode is currently unallocated!!
705 *
706 * ext3_read_inode will return a bad_inode if the inode had been
707 * deleted, so we should be safe.
708 *
709 * Currently we don't know the generation for parent directory, so
710 * a generation of 0 means "accept any"
711 */
473043dc
DH		 712 inode = ext3_iget(sb, ino);
713 if (IS_ERR(inode))
714 return ERR_CAST(inode);
715 if (generation && inode->i_generation != generation) {
fdb36673
N		 716 iput(inode);
717 return ERR_PTR(-ESTALE);
718 }
74af0baa
CH		 719
720 return inode;
721}
722
723static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
724 int fh_len, int fh_type)
725{
726 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
727 ext3_nfs_get_inode);
728}
729
730static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
731 int fh_len, int fh_type)
732{
733 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
734 ext3_nfs_get_inode);
fdb36673
N		 735}
736
6b082b53
TO		 737/*
738 * Try to release metadata pages (indirect blocks, directories) which are
739 * mapped via the block device. Since these pages could have journal heads
740 * which would prevent try_to_free_buffers() from freeing them, we must use
741 * jbd layer's try_to_free_buffers() function to release them.
742 */
743static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
744 gfp_t wait)
745{
746 journal_t *journal = EXT3_SB(sb)->s_journal;
747
748 WARN_ON(PageChecked(page));
749 if (!page_has_buffers(page))
750 return 0;
751 if (journal)
752 return journal_try_to_free_buffers(journal, page,
753 wait & ~__GFP_WAIT);
754 return try_to_free_buffers(page);
755}
756
8fc2751b 757#ifdef CONFIG_QUOTA
1da177e4
LT		 758#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
759#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
760
1da177e4
LT		 761static int ext3_write_dquot(struct dquot *dquot);
762static int ext3_acquire_dquot(struct dquot *dquot);
763static int ext3_release_dquot(struct dquot *dquot);
764static int ext3_mark_dquot_dirty(struct dquot *dquot);
765static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f 766static int ext3_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 767 struct path *path);
1da177e4
LT		 768static int ext3_quota_on_mount(struct super_block *sb, int type);
769static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
770 size_t len, loff_t off);
771static ssize_t ext3_quota_write(struct super_block *sb, int type,
772 const char *data, size_t len, loff_t off);
4018cfbc
JK		 773static struct dquot **ext3_get_dquots(struct inode *inode)
774{
775 return EXT3_I(inode)->i_dquot;
776}
1da177e4 777
61e225dc 778static const struct dquot_operations ext3_quota_operations = {
1da177e4
LT		 779 .write_dquot = ext3_write_dquot,
780 .acquire_dquot = ext3_acquire_dquot,
781 .release_dquot = ext3_release_dquot,
782 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 783 .write_info = ext3_write_info,
784 .alloc_dquot = dquot_alloc,
785 .destroy_dquot = dquot_destroy,
1da177e4
LT		 786};
787
0d54b217 788static const struct quotactl_ops ext3_qctl_operations = {
1da177e4 789 .quota_on = ext3_quota_on,
287a8095
CH		 790 .quota_off = dquot_quota_off,
791 .quota_sync = dquot_quota_sync,
792 .get_info = dquot_get_dqinfo,
793 .set_info = dquot_set_dqinfo,
794 .get_dqblk = dquot_get_dqblk,
795 .set_dqblk = dquot_set_dqblk
1da177e4
LT		 796};
797#endif
798
ee9b6d61 799static const struct super_operations ext3_sops = {
1da177e4
LT		 800 .alloc_inode = ext3_alloc_inode,
801 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 802 .write_inode = ext3_write_inode,
803 .dirty_inode = ext3_dirty_inode,
785c4bcc 804 .drop_inode = ext3_drop_inode,
ac14a95b 805 .evict_inode = ext3_evict_inode,
1da177e4 806 .put_super = ext3_put_super,
1da177e4 807 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 808 .freeze_fs = ext3_freeze,
809 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 810 .statfs = ext3_statfs,
811 .remount_fs = ext3_remount,
8fc2751b 812 .show_options = ext3_show_options,
1da177e4
LT		 813#ifdef CONFIG_QUOTA
814 .quota_read = ext3_quota_read,
815 .quota_write = ext3_quota_write,
4018cfbc 816 .get_dquots = ext3_get_dquots,
1da177e4 817#endif
6b082b53 818 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 819};
820
39655164 821static const struct export_operations ext3_export_ops = {
74af0baa
CH		 822 .fh_to_dentry = ext3_fh_to_dentry,
823 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 824 .get_parent = ext3_get_parent,
825};
826
827enum {
828 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
829 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 830 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 831 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 832 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 833 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
cf7eff46 834 Opt_journal_path,
1da177e4 835 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 836 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 837 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1aeec434 838 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
0636c73e
ES		 839 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
840 Opt_resize, Opt_usrquota, Opt_grpquota
1da177e4
LT		 841};
842
a447c093 843static const match_table_t tokens = {
1da177e4
LT		 844 {Opt_bsd_df, "bsddf"},
845 {Opt_minix_df, "minixdf"},
846 {Opt_grpid, "grpid"},
847 {Opt_grpid, "bsdgroups"},
848 {Opt_nogrpid, "nogrpid"},
849 {Opt_nogrpid, "sysvgroups"},
850 {Opt_resgid, "resgid=%u"},
851 {Opt_resuid, "resuid=%u"},
852 {Opt_sb, "sb=%u"},
853 {Opt_err_cont, "errors=continue"},
854 {Opt_err_panic, "errors=panic"},
855 {Opt_err_ro, "errors=remount-ro"},
856 {Opt_nouid32, "nouid32"},
857 {Opt_nocheck, "nocheck"},
858 {Opt_nocheck, "check=none"},
1da177e4
LT		 859 {Opt_debug, "debug"},
860 {Opt_oldalloc, "oldalloc"},
861 {Opt_orlov, "orlov"},
862 {Opt_user_xattr, "user_xattr"},
863 {Opt_nouser_xattr, "nouser_xattr"},
864 {Opt_acl, "acl"},
865 {Opt_noacl, "noacl"},
866 {Opt_reservation, "reservation"},
867 {Opt_noreservation, "noreservation"},
868 {Opt_noload, "noload"},
dee1d3b6 869 {Opt_noload, "norecovery"},
1da177e4 870 {Opt_nobh, "nobh"},
ade1a29e 871 {Opt_bh, "bh"},
1da177e4
LT		 872 {Opt_commit, "commit=%u"},
873 {Opt_journal_update, "journal=update"},
874 {Opt_journal_inum, "journal=%u"},
71b96257 875 {Opt_journal_dev, "journal_dev=%u"},
cf7eff46 876 {Opt_journal_path, "journal_path=%s"},
1da177e4
LT		 877 {Opt_abort, "abort"},
878 {Opt_data_journal, "data=journal"},
879 {Opt_data_ordered, "data=ordered"},
880 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 881 {Opt_data_err_abort, "data_err=abort"},
882 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 883 {Opt_offusrjquota, "usrjquota="},
884 {Opt_usrjquota, "usrjquota=%s"},
885 {Opt_offgrpjquota, "grpjquota="},
886 {Opt_grpjquota, "grpjquota=%s"},
887 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
888 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1aeec434 889 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
8fc2751b 890 {Opt_grpquota, "grpquota"},
1f54587b
JK		 891 {Opt_noquota, "noquota"},
892 {Opt_quota, "quota"},
8fc2751b 893 {Opt_usrquota, "usrquota"},
1da177e4 894 {Opt_barrier, "barrier=%u"},
0636c73e
ES		 895 {Opt_barrier, "barrier"},
896 {Opt_nobarrier, "nobarrier"},
1da177e4 897 {Opt_resize, "resize"},
92587216 898 {Opt_err, NULL},
1da177e4
LT		 899};
900
4cf46b67 901static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 902{
e9ad5620
DK		 903 ext3_fsblk_t sb_block;
904 char *options = (char *) *data;
1da177e4
LT		 905
906 if (!options || strncmp(options, "sb=", 3) != 0)
907 return 1; /* Default location */
908 options += 3;
43d23f90 909 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 910 sb_block = simple_strtoul(options, &options, 0);
911 if (*options && *options != ',') {
8d0c2d10 912 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
1da177e4
LT		 913 (char *) *data);
914 return 1;
915 }
916 if (*options == ',')
917 options++;
918 *data = (void *) options;
919 return sb_block;
920}
921
e1f5c67a
DM		 922#ifdef CONFIG_QUOTA
923static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
924{
925 struct ext3_sb_info *sbi = EXT3_SB(sb);
926 char *qname;
927
928 if (sb_any_quota_loaded(sb) &&
929 !sbi->s_qf_names[qtype]) {
930 ext3_msg(sb, KERN_ERR,
931 "Cannot change journaled "
932 "quota options when quota turned on");
933 return 0;
934 }
935 qname = match_strdup(args);
936 if (!qname) {
937 ext3_msg(sb, KERN_ERR,
938 "Not enough memory for storing quotafile name");
939 return 0;
940 }
f56426ae
JK		 941 if (sbi->s_qf_names[qtype]) {
942 int same = !strcmp(sbi->s_qf_names[qtype], qname);
943
e1f5c67a 944 kfree(qname);
f56426ae
JK		 945 if (!same) {
946 ext3_msg(sb, KERN_ERR,
947 "%s quota file already specified",
948 QTYPE2NAME(qtype));
949 }
950 return same;
e1f5c67a 951 }
f56426ae 952 if (strchr(qname, '/')) {
e1f5c67a
DM		 953 ext3_msg(sb, KERN_ERR,
954 "quotafile must be on filesystem root");
f56426ae 955 kfree(qname);
e1f5c67a
DM		 956 return 0;
957 }
f56426ae 958 sbi->s_qf_names[qtype] = qname;
e1f5c67a
DM		 959 set_opt(sbi->s_mount_opt, QUOTA);
960 return 1;
961}
962
963static int clear_qf_name(struct super_block *sb, int qtype) {
964
965 struct ext3_sb_info *sbi = EXT3_SB(sb);
966
967 if (sb_any_quota_loaded(sb) &&
968 sbi->s_qf_names[qtype]) {
969 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
970 " when quota turned on");
971 return 0;
972 }
f56426ae
JK		 973 if (sbi->s_qf_names[qtype]) {
974 kfree(sbi->s_qf_names[qtype]);
975 sbi->s_qf_names[qtype] = NULL;
976 }
e1f5c67a
DM		 977 return 1;
978}
979#endif
980
71b96257 981static int parse_options (char *options, struct super_block *sb,
eee194e7 982 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 983 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 984{
985 struct ext3_sb_info *sbi = EXT3_SB(sb);
986 char * p;
987 substring_t args[MAX_OPT_ARGS];
988 int data_opt = 0;
989 int option;
1523299d
EB		 990 kuid_t uid;
991 kgid_t gid;
cf7eff46
ES		 992 char *journal_path;
993 struct inode *journal_inode;
994 struct path path;
995 int error;
996
1da177e4 997#ifdef CONFIG_QUOTA
e1f5c67a 998 int qfmt;
1da177e4
LT		 999#endif
1000
1001 if (!options)
1002 return 1;
1003
1004 while ((p = strsep (&options, ",")) != NULL) {
1005 int token;
1006 if (!*p)
1007 continue;
0636c73e
ES		 1008 /*
1009 * Initialize args struct so we know whether arg was
1010 * found; some options take optional arguments.
1011 */
76f59b3b 1012 args[0].to = args[0].from = NULL;
1da177e4
LT		 1013 token = match_token(p, tokens, args);
1014 switch (token) {
1015 case Opt_bsd_df:
1016 clear_opt (sbi->s_mount_opt, MINIX_DF);
1017 break;
1018 case Opt_minix_df:
1019 set_opt (sbi->s_mount_opt, MINIX_DF);
1020 break;
1021 case Opt_grpid:
1022 set_opt (sbi->s_mount_opt, GRPID);
1023 break;
1024 case Opt_nogrpid:
1025 clear_opt (sbi->s_mount_opt, GRPID);
1026 break;
1027 case Opt_resuid:
1028 if (match_int(&args[0], &option))
1029 return 0;
1523299d
EB		 1030 uid = make_kuid(current_user_ns(), option);
1031 if (!uid_valid(uid)) {
1032 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
66415f6b 1033 return 0;
1523299d
EB		 1034
1035 }
1036 sbi->s_resuid = uid;
1da177e4
LT		 1037 break;
1038 case Opt_resgid:
1039 if (match_int(&args[0], &option))
1040 return 0;
1523299d
EB		 1041 gid = make_kgid(current_user_ns(), option);
1042 if (!gid_valid(gid)) {
1043 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
66415f6b 1044 return 0;
1523299d
EB		 1045 }
1046 sbi->s_resgid = gid;
1da177e4
LT		 1047 break;
1048 case Opt_sb:
1049 /* handled by get_sb_block() instead of here */
1050 /* *sb_block = match_int(&args[0]); */
1051 break;
1052 case Opt_err_panic:
1053 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1054 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1055 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1056 break;
1057 case Opt_err_ro:
1058 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1059 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1060 set_opt (sbi->s_mount_opt, ERRORS_RO);
1061 break;
1062 case Opt_err_cont:
1063 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1064 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1065 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1066 break;
1067 case Opt_nouid32:
1068 set_opt (sbi->s_mount_opt, NO_UID32);
1069 break;
1da177e4
LT		 1070 case Opt_nocheck:
1071 clear_opt (sbi->s_mount_opt, CHECK);
1072 break;
1073 case Opt_debug:
1074 set_opt (sbi->s_mount_opt, DEBUG);
1075 break;
1076 case Opt_oldalloc:
fbc85402
LC		 1077 ext3_msg(sb, KERN_WARNING,
1078 "Ignoring deprecated oldalloc option");
1da177e4
LT		 1079 break;
1080 case Opt_orlov:
fbc85402
LC		 1081 ext3_msg(sb, KERN_WARNING,
1082 "Ignoring deprecated orlov option");
1da177e4
LT		 1083 break;
1084#ifdef CONFIG_EXT3_FS_XATTR
1085 case Opt_user_xattr:
1086 set_opt (sbi->s_mount_opt, XATTR_USER);
1087 break;
1088 case Opt_nouser_xattr:
1089 clear_opt (sbi->s_mount_opt, XATTR_USER);
1090 break;
1091#else
1092 case Opt_user_xattr:
1093 case Opt_nouser_xattr:
4cf46b67
AF		 1094 ext3_msg(sb, KERN_INFO,
1095 "(no)user_xattr options not supported");
1da177e4
LT		 1096 break;
1097#endif
1098#ifdef CONFIG_EXT3_FS_POSIX_ACL
1099 case Opt_acl:
1100 set_opt(sbi->s_mount_opt, POSIX_ACL);
1101 break;
1102 case Opt_noacl:
1103 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1104 break;
1105#else
1106 case Opt_acl:
1107 case Opt_noacl:
4cf46b67
AF		 1108 ext3_msg(sb, KERN_INFO,
1109 "(no)acl options not supported");
1da177e4
LT		 1110 break;
1111#endif
1112 case Opt_reservation:
1113 set_opt(sbi->s_mount_opt, RESERVATION);
1114 break;
1115 case Opt_noreservation:
1116 clear_opt(sbi->s_mount_opt, RESERVATION);
1117 break;
1118 case Opt_journal_update:
1119 /* @@@ FIXME */
1120 /* Eventually we will want to be able to create
1121 a journal file here. For now, only allow the
1122 user to specify an existing inode to be the
1123 journal file. */
1124 if (is_remount) {
4cf46b67
AF		 1125 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1126 "journal on remount");
1da177e4
LT		 1127 return 0;
1128 }
1129 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1130 break;
1131 case Opt_journal_inum:
1132 if (is_remount) {
4cf46b67
AF		 1133 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1134 "journal on remount");
1da177e4
LT		 1135 return 0;
1136 }
1137 if (match_int(&args[0], &option))
1138 return 0;
1139 *inum = option;
1140 break;
71b96257
JL		 1141 case Opt_journal_dev:
1142 if (is_remount) {
4cf46b67
AF		 1143 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1144 "journal on remount");
71b96257
JL		 1145 return 0;
1146 }
1147 if (match_int(&args[0], &option))
1148 return 0;
1149 *journal_devnum = option;
1150 break;
cf7eff46
ES		 1151 case Opt_journal_path:
1152 if (is_remount) {
1153 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1154 "journal on remount");
1155 return 0;
1156 }
1157
1158 journal_path = match_strdup(&args[0]);
1159 if (!journal_path) {
1160 ext3_msg(sb, KERN_ERR, "error: could not dup "
1161 "journal device string");
1162 return 0;
1163 }
1164
1165 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1166 if (error) {
1167 ext3_msg(sb, KERN_ERR, "error: could not find "
1168 "journal device path: error %d", error);
1169 kfree(journal_path);
1170 return 0;
1171 }
1172
1173 journal_inode = path.dentry->d_inode;
1174 if (!S_ISBLK(journal_inode->i_mode)) {
1175 ext3_msg(sb, KERN_ERR, "error: journal path %s "
1176 "is not a block device", journal_path);
1177 path_put(&path);
1178 kfree(journal_path);
1179 return 0;
1180 }
1181
1182 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1183 path_put(&path);
1184 kfree(journal_path);
1185 break;
1da177e4
LT		 1186 case Opt_noload:
1187 set_opt (sbi->s_mount_opt, NOLOAD);
1188 break;
1189 case Opt_commit:
1190 if (match_int(&args[0], &option))
1191 return 0;
1192 if (option < 0)
1193 return 0;
1194 if (option == 0)
1195 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1196 sbi->s_commit_interval = HZ * option;
1197 break;
1198 case Opt_data_journal:
1199 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1200 goto datacheck;
1201 case Opt_data_ordered:
1202 data_opt = EXT3_MOUNT_ORDERED_DATA;
1203 goto datacheck;
1204 case Opt_data_writeback:
1205 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1206 datacheck:
1207 if (is_remount) {
e3c96435 1208 if (test_opt(sb, DATA_FLAGS) == data_opt)
3c4cec65 1209 break;
4cf46b67
AF		 1210 ext3_msg(sb, KERN_ERR,
1211 "error: cannot change "
3c4cec65
JK		 1212 "data mode on remount. The filesystem "
1213 "is mounted in data=%s mode and you "
4cf46b67 1214 "try to remount it in data=%s mode.",
e3c96435
DM		 1215 data_mode_string(test_opt(sb,
1216 DATA_FLAGS)),
3c4cec65
JK		 1217 data_mode_string(data_opt));
1218 return 0;
1da177e4 1219 } else {
e3c96435 1220 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1da177e4
LT		 1221 sbi->s_mount_opt |= data_opt;
1222 }
1223 break;
0e4fb5e2
HK		 1224 case Opt_data_err_abort:
1225 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1226 break;
1227 case Opt_data_err_ignore:
1228 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1229 break;
1da177e4
LT		 1230#ifdef CONFIG_QUOTA
1231 case Opt_usrjquota:
e1f5c67a 1232 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1da177e4 1233 return 0;
e1f5c67a
DM		 1234 break;
1235 case Opt_grpjquota:
1236 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1da177e4 1237 return 0;
1da177e4
LT		 1238 break;
1239 case Opt_offusrjquota:
e1f5c67a
DM		 1240 if (!clear_qf_name(sb, USRQUOTA))
1241 return 0;
1242 break;
1da177e4 1243 case Opt_offgrpjquota:
e1f5c67a 1244 if (!clear_qf_name(sb, GRPQUOTA))
1da177e4 1245 return 0;
1da177e4
LT		 1246 break;
1247 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1248 qfmt = QFMT_VFS_OLD;
1249 goto set_qf_format;
1da177e4 1250 case Opt_jqfmt_vfsv0:
d06bf1d2 1251 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1252 goto set_qf_format;
1253 case Opt_jqfmt_vfsv1:
1254 qfmt = QFMT_VFS_V1;
d06bf1d2 1255set_qf_format:
ee0d5ffe 1256 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1257 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1258 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1259 "journaled quota options when "
4cf46b67 1260 "quota turned on.");
d06bf1d2
JK		 1261 return 0;
1262 }
1263 sbi->s_jquota_fmt = qfmt;
1da177e4 1264 break;
1f54587b 1265 case Opt_quota:
8fc2751b
MB		 1266 case Opt_usrquota:
1267 set_opt(sbi->s_mount_opt, QUOTA);
1268 set_opt(sbi->s_mount_opt, USRQUOTA);
1269 break;
1270 case Opt_grpquota:
1f54587b 1271 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1272 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1273 break;
1274 case Opt_noquota:
ee0d5ffe 1275 if (sb_any_quota_loaded(sb)) {
4cf46b67
AF		 1276 ext3_msg(sb, KERN_ERR, "error: cannot change "
1277 "quota options when quota turned on.");
1f54587b
JK		 1278 return 0;
1279 }
1280 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1281 clear_opt(sbi->s_mount_opt, USRQUOTA);
1282 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1283 break;
1da177e4 1284#else
8fc2751b
MB		 1285 case Opt_quota:
1286 case Opt_usrquota:
1287 case Opt_grpquota:
4cf46b67
AF		 1288 ext3_msg(sb, KERN_ERR,
1289 "error: quota options not supported.");
fa1ff1e0 1290 break;
1da177e4
LT		 1291 case Opt_usrjquota:
1292 case Opt_grpjquota:
1293 case Opt_offusrjquota:
1294 case Opt_offgrpjquota:
1295 case Opt_jqfmt_vfsold:
1296 case Opt_jqfmt_vfsv0:
1aeec434 1297 case Opt_jqfmt_vfsv1:
4cf46b67
AF		 1298 ext3_msg(sb, KERN_ERR,
1299 "error: journaled quota options not "
1300 "supported.");
1da177e4 1301 break;
1f54587b
JK		 1302 case Opt_noquota:
1303 break;
1da177e4
LT		 1304#endif
1305 case Opt_abort:
1306 set_opt(sbi->s_mount_opt, ABORT);
1307 break;
0636c73e
ES		 1308 case Opt_nobarrier:
1309 clear_opt(sbi->s_mount_opt, BARRIER);
1310 break;
1da177e4 1311 case Opt_barrier:
0636c73e
ES		 1312 if (args[0].from) {
1313 if (match_int(&args[0], &option))
1314 return 0;
1315 } else
1316 option = 1; /* No argument, default to 1 */
1da177e4
LT		 1317 if (option)
1318 set_opt(sbi->s_mount_opt, BARRIER);
1319 else
1320 clear_opt(sbi->s_mount_opt, BARRIER);
1321 break;
1322 case Opt_ignore:
1323 break;
1324 case Opt_resize:
08c6a96f 1325 if (!is_remount) {
4cf46b67
AF		 1326 ext3_msg(sb, KERN_ERR,
1327 "error: resize option only available "
1328 "for remount");
1da177e4
LT		 1329 return 0;
1330 }
c7f1721e
KZ		 1331 if (match_int(&args[0], &option) != 0)
1332 return 0;
1da177e4
LT		 1333 *n_blocks_count = option;
1334 break;
1335 case Opt_nobh:
4c4d3901
CH		 1336 ext3_msg(sb, KERN_WARNING,
1337 "warning: ignoring deprecated nobh option");
1da177e4 1338 break;
ade1a29e 1339 case Opt_bh:
4c4d3901
CH		 1340 ext3_msg(sb, KERN_WARNING,
1341 "warning: ignoring deprecated bh option");
ade1a29e 1342 break;
1da177e4 1343 default:
4cf46b67
AF		 1344 ext3_msg(sb, KERN_ERR,
1345 "error: unrecognized mount option \"%s\" "
1346 "or missing value", p);
1da177e4
LT		 1347 return 0;
1348 }
1349 }
1350#ifdef CONFIG_QUOTA
8fc2751b 1351 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
e3c96435 1352 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
8fc2751b 1353 clear_opt(sbi->s_mount_opt, USRQUOTA);
e3c96435 1354 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
8fc2751b
MB		 1355 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1356
e1f5c67a 1357 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
4cf46b67
AF		 1358 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1359 "format mixing.");
8fc2751b
MB		 1360 return 0;
1361 }
1362
1363 if (!sbi->s_jquota_fmt) {
4cf46b67
AF		 1364 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1365 "not specified.");
8fc2751b
MB		 1366 return 0;
1367 }
1da177e4
LT		 1368 }
1369#endif
1da177e4
LT		 1370 return 1;
1371}
1372
1373static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1374 int read_only)
1375{
1376 struct ext3_sb_info *sbi = EXT3_SB(sb);
1377 int res = 0;
1378
1379 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
AF		 1380 ext3_msg(sb, KERN_ERR,
1381 "error: revision level too high, "
1382 "forcing read-only mode");
1da177e4
LT		 1383 res = MS_RDONLY;
1384 }
1385 if (read_only)
1386 return res;
1387 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
AF		 1388 ext3_msg(sb, KERN_WARNING,
1389 "warning: mounting unchecked fs, "
1390 "running e2fsck is recommended");
1da177e4 1391 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
AF		 1392 ext3_msg(sb, KERN_WARNING,
1393 "warning: mounting fs with errors, "
1394 "running e2fsck is recommended");
df0d6b8f 1395 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1da177e4 1396 le16_to_cpu(es->s_mnt_count) >=
df0d6b8f 1397 le16_to_cpu(es->s_max_mnt_count))
4cf46b67
AF		 1398 ext3_msg(sb, KERN_WARNING,
1399 "warning: maximal mount count reached, "
1400 "running e2fsck is recommended");
1da177e4
LT		 1401 else if (le32_to_cpu(es->s_checkinterval) &&
1402 (le32_to_cpu(es->s_lastcheck) +
1403 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
AF		 1404 ext3_msg(sb, KERN_WARNING,
1405 "warning: checktime reached, "
1406 "running e2fsck is recommended");
1da177e4
LT		 1407#if 0
1408 /* @@@ We _will_ want to clear the valid bit if we find
1409 inconsistencies, to force a fsck at reboot. But for
1410 a plain journaled filesystem we can keep it set as
1411 valid forever! :) */
e7f23ebd 1412 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4 1413#endif
df0d6b8f 1414 if (!le16_to_cpu(es->s_max_mnt_count))
1da177e4 1415 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1416 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1417 es->s_mtime = cpu_to_le32(get_seconds());
1418 ext3_update_dynamic_rev(sb);
1419 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1420
1421 ext3_commit_super(sb, es, 1);
1422 if (test_opt(sb, DEBUG))
4cf46b67
AF		 1423 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1424 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1425 sb->s_blocksize,
1426 sbi->s_groups_count,
1427 EXT3_BLOCKS_PER_GROUP(sb),
1428 EXT3_INODES_PER_GROUP(sb),
1429 sbi->s_mount_opt);
1430
1da177e4
LT		 1431 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1432 char b[BDEVNAME_SIZE];
4cf46b67 1433 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1434 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1435 } else {
4cf46b67 1436 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1437 }
d71bc6db 1438 cleancache_init_fs(sb);
1da177e4
LT		 1439 return res;
1440}
1441
1442/* Called at mount-time, super-block is locked */
197cd65a 1443static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1444{
1445 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1446 int i;
1447
1448 ext3_debug ("Checking group descriptors");
1449
197cd65a
AM		 1450 for (i = 0; i < sbi->s_groups_count; i++) {
1451 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1452 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1453 ext3_fsblk_t last_block;
197cd65a 1454
855565e8
ES		 1455 if (i == sbi->s_groups_count - 1)
1456 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1457 else
1458 last_block = first_block +
1459 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1460
855565e8
ES		 1461 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1462 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1463 {
1464 ext3_error (sb, "ext3_check_descriptors",
1465 "Block bitmap for group %d"
1466 " not in group (block %lu)!",
1467 i, (unsigned long)
1468 le32_to_cpu(gdp->bg_block_bitmap));
1469 return 0;
1470 }
855565e8
ES		 1471 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1472 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1473 {
1474 ext3_error (sb, "ext3_check_descriptors",
1475 "Inode bitmap for group %d"
1476 " not in group (block %lu)!",
1477 i, (unsigned long)
1478 le32_to_cpu(gdp->bg_inode_bitmap));
1479 return 0;
1480 }
855565e8 1481 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1482 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1483 last_block)
1da177e4
LT		 1484 {
1485 ext3_error (sb, "ext3_check_descriptors",
1486 "Inode table for group %d"
1487 " not in group (block %lu)!",
1488 i, (unsigned long)
1489 le32_to_cpu(gdp->bg_inode_table));
1490 return 0;
1491 }
1da177e4
LT		 1492 }
1493
1494 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1495 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1496 return 1;
1497}
1498
1499
1500/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1501 * the superblock) which were deleted from all directories, but held open by
1502 * a process at the time of a crash. We walk the list and try to delete these
1503 * inodes at recovery time (only with a read-write filesystem).
1504 *
1505 * In order to keep the orphan inode chain consistent during traversal (in
1506 * case of crash during recovery), we link each inode into the superblock
1507 * orphan list_head and handle it the same way as an inode deletion during
1508 * normal operation (which journals the operations for us).
1509 *
1510 * We only do an iget() and an iput() on each inode, which is very safe if we
1511 * accidentally point at an in-use or already deleted inode. The worst that
1512 * can happen in this case is that we get a "bit already cleared" message from
1513 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1514 * e2fsck was run on this filesystem, and it must have already done the orphan
1515 * inode cleanup for us, so we can safely abort without any further action.
1516 */
1517static void ext3_orphan_cleanup (struct super_block * sb,
1518 struct ext3_super_block * es)
1519{
1520 unsigned int s_flags = sb->s_flags;
1521 int nr_orphans = 0, nr_truncates = 0;
1522#ifdef CONFIG_QUOTA
1523 int i;
1524#endif
1525 if (!es->s_last_orphan) {
1526 jbd_debug(4, "no orphan inodes to clean up\n");
1527 return;
1528 }
1529
a8f48a95 1530 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
AF		 1531 ext3_msg(sb, KERN_ERR, "error: write access "
1532 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1533 return;
1534 }
1535
ce654b37
AG		 1536 /* Check if feature set allows readwrite operations */
1537 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1538 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1539 "unknown ROCOMPAT features");
1540 return;
a8f48a95
ES		 1541 }
1542
1da177e4 1543 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
e4230108
ES		 1544 /* don't clear list on RO mount w/ errors */
1545 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1da177e4
LT		 1546 jbd_debug(1, "Errors on filesystem, "
1547 "clearing orphan list.\n");
e4230108
ES		 1548 es->s_last_orphan = 0;
1549 }
1da177e4
LT		 1550 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1551 return;
1552 }
1553
1554 if (s_flags & MS_RDONLY) {
4cf46b67 1555 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1556 sb->s_flags &= ~MS_RDONLY;
1557 }
1558#ifdef CONFIG_QUOTA
1559 /* Needed for iput() to work correctly and not trash data */
1560 sb->s_flags |= MS_ACTIVE;
1561 /* Turn on quotas so that they are updated correctly */
a93114e4 1562 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
1da177e4
LT		 1563 if (EXT3_SB(sb)->s_qf_names[i]) {
1564 int ret = ext3_quota_on_mount(sb, i);
1565 if (ret < 0)
4cf46b67
AF		 1566 ext3_msg(sb, KERN_ERR,
1567 "error: cannot turn on journaled "
1568 "quota: %d", ret);
1da177e4
LT		 1569 }
1570 }
1571#endif
1572
1573 while (es->s_last_orphan) {
1574 struct inode *inode;
1575
473043dc
DH		 1576 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1577 if (IS_ERR(inode)) {
1da177e4
LT		 1578 es->s_last_orphan = 0;
1579 break;
1580 }
1581
1582 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
871a2931 1583 dquot_initialize(inode);
1da177e4
LT		 1584 if (inode->i_nlink) {
1585 printk(KERN_DEBUG
eee194e7 1586 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1587 __func__, inode->i_ino, inode->i_size);
eee194e7 1588 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1589 inode->i_ino, inode->i_size);
1590 ext3_truncate(inode);
1591 nr_truncates++;
1592 } else {
1593 printk(KERN_DEBUG
eee194e7 1594 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1595 __func__, inode->i_ino);
eee194e7 1596 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1597 inode->i_ino);
1598 nr_orphans++;
1599 }
1600 iput(inode); /* The delete magic happens here! */
1601 }
1602
1603#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1604
1605 if (nr_orphans)
4cf46b67
AF		 1606 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1607 PLURAL(nr_orphans));
1da177e4 1608 if (nr_truncates)
4cf46b67
AF		 1609 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1610 PLURAL(nr_truncates));
1da177e4
LT		 1611#ifdef CONFIG_QUOTA
1612 /* Turn quotas off */
a93114e4 1613 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
1da177e4 1614 if (sb_dqopt(sb)->files[i])
287a8095 1615 dquot_quota_off(sb, i);
1da177e4
LT		 1616 }
1617#endif
1618 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1619}
1620
1da177e4
LT		 1621/*
1622 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1623 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1624 * We need to be 1 filesystem block less than the 2^32 sector limit.
1625 */
1626static loff_t ext3_max_size(int bits)
1627{
1628 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1629 int meta_blocks;
1630 loff_t upper_limit;
1631
1632 /* This is calculated to be the largest file size for a
1633 * dense, file such that the total number of
1da177e4 1634 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1635 * does not exceed 2^32 -1
1636 * __u32 i_blocks representing the total number of
1637 * 512 bytes blocks of the file
1638 */
1639 upper_limit = (1LL << 32) - 1;
1640
1641 /* total blocks in file system block size */
1642 upper_limit >>= (bits - 9);
1643
1644
1645 /* indirect blocks */
1646 meta_blocks = 1;
1647 /* double indirect blocks */
1648 meta_blocks += 1 + (1LL << (bits-2));
1649 /* tripple indirect blocks */
1650 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1651
1652 upper_limit -= meta_blocks;
1653 upper_limit <<= bits;
1da177e4
LT		 1654
1655 res += 1LL << (bits-2);
1656 res += 1LL << (2*(bits-2));
1657 res += 1LL << (3*(bits-2));
1658 res <<= bits;
1659 if (res > upper_limit)
1660 res = upper_limit;
fe7fdc37
AK		 1661
1662 if (res > MAX_LFS_FILESIZE)
1663 res = MAX_LFS_FILESIZE;
1664
1da177e4
LT		 1665 return res;
1666}
1667
43d23f90
MC		 1668static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1669 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1670 int nr)
1671{
1672 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1673 unsigned long bg, first_meta_bg;
1da177e4
LT		 1674 int has_super = 0;
1675
1da177e4
LT		 1676 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1677
1678 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1679 nr < first_meta_bg)
1680 return (logic_sb_block + nr + 1);
1681 bg = sbi->s_desc_per_block * nr;
1682 if (ext3_bg_has_super(sb, bg))
1683 has_super = 1;
43d23f90 1684 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1685}
1686
1687
1688static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1689{
1690 struct buffer_head * bh;
1691 struct ext3_super_block *es = NULL;
1692 struct ext3_sb_info *sbi;
43d23f90 1693 ext3_fsblk_t block;
4cf46b67 1694 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1695 ext3_fsblk_t logic_sb_block;
1da177e4 1696 unsigned long offset = 0;
eee194e7 1697 unsigned int journal_inum = 0;
71b96257 1698 unsigned long journal_devnum = 0;
1da177e4
LT		 1699 unsigned long def_mount_opts;
1700 struct inode *root;
1701 int blocksize;
1702 int hblock;
1703 int db_count;
1704 int i;
1705 int needs_recovery;
473043dc 1706 int ret = -EINVAL;
1da177e4 1707 __le32 features;
833f4077 1708 int err;
1da177e4 1709
f8314dc6 1710 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1711 if (!sbi)
1712 return -ENOMEM;
5df096d6
PE		 1713
1714 sbi->s_blockgroup_lock =
1715 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1716 if (!sbi->s_blockgroup_lock) {
1717 kfree(sbi);
1718 return -ENOMEM;
1719 }
1da177e4 1720 sb->s_fs_info = sbi;
571beed8 1721 sbi->s_sb_block = sb_block;
1da177e4 1722
1da177e4
LT		 1723 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1724 if (!blocksize) {
4cf46b67 1725 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1726 goto out_fail;
1727 }
1728
1729 /*
1730 * The ext3 superblock will not be buffer aligned for other than 1kB
1731 * block sizes. We need to calculate the offset from buffer start.
1732 */
1733 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1734 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1735 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1736 } else {
1737 logic_sb_block = sb_block;
1738 }
1739
1740 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1741 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1742 goto out_fail;
1743 }
1744 /*
1745 * Note: s_es must be initialized as soon as possible because
1746 * some ext3 macro-instructions depend on its value
1747 */
57e94d86 1748 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 1749 sbi->s_es = es;
1750 sb->s_magic = le16_to_cpu(es->s_magic);
1751 if (sb->s_magic != EXT3_SUPER_MAGIC)
1752 goto cantfind_ext3;
1753
1754 /* Set defaults before we parse the mount options */
1755 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1756 if (def_mount_opts & EXT3_DEFM_DEBUG)
1757 set_opt(sbi->s_mount_opt, DEBUG);
1758 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1759 set_opt(sbi->s_mount_opt, GRPID);
1760 if (def_mount_opts & EXT3_DEFM_UID16)
1761 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1762#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1763 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1764 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1765#endif
1766#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1767 if (def_mount_opts & EXT3_DEFM_ACL)
1768 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1769#endif
1da177e4 1770 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
e3c96435 1771 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1da177e4 1772 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
e3c96435 1773 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1da177e4 1774 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
e3c96435 1775 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1da177e4
LT		 1776
1777 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1778 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1779 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1780 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1781 else
1782 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4 1783
1523299d
EB		 1784 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1785 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1da177e4 1786
00eacd66
CH		 1787 /* enable barriers by default */
1788 set_opt(sbi->s_mount_opt, BARRIER);
1da177e4
LT		 1789 set_opt(sbi->s_mount_opt, RESERVATION);
1790
71b96257
JL		 1791 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1792 NULL, 0))
1da177e4
LT		 1793 goto failed_mount;
1794
1795 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 1796 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 1797
1798 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1799 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1800 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1801 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
AF		 1802 ext3_msg(sb, KERN_WARNING,
1803 "warning: feature flags set on rev 0 fs, "
1804 "running e2fsck is recommended");
1da177e4
LT		 1805 /*
1806 * Check feature flags regardless of the revision level, since we
1807 * previously didn't change the revision level when setting the flags,
1808 * so there is a chance incompat flags are set on a rev 0 filesystem.
1809 */
1810 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1811 if (features) {
4cf46b67
AF		 1812 ext3_msg(sb, KERN_ERR,
1813 "error: couldn't mount because of unsupported "
1814 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1815 goto failed_mount;
1816 }
1817 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1818 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
AF		 1819 ext3_msg(sb, KERN_ERR,
1820 "error: couldn't mount RDWR because of unsupported "
1821 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1822 goto failed_mount;
1823 }
1824 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1825
1826 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1827 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
AF		 1828 ext3_msg(sb, KERN_ERR,
1829 "error: couldn't mount because of unsupported "
1830 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1831 goto failed_mount;
1832 }
1833
e1defc4f 1834 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1835 if (sb->s_blocksize != blocksize) {
1836 /*
1837 * Make sure the blocksize for the filesystem is larger
1838 * than the hardware sectorsize for the machine.
1839 */
1840 if (blocksize < hblock) {
4cf46b67
AF		 1841 ext3_msg(sb, KERN_ERR,
1842 "error: fsblocksize %d too small for "
1843 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1844 goto failed_mount;
1845 }
1846
1847 brelse (bh);
0f0a89eb 1848 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
AF		 1849 ext3_msg(sb, KERN_ERR,
1850 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1851 goto out_fail;
1852 }
1da177e4
LT		 1853 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1854 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1855 bh = sb_bread(sb, logic_sb_block);
1856 if (!bh) {
4cf46b67
AF		 1857 ext3_msg(sb, KERN_ERR,
1858 "error: can't read superblock on 2nd try");
1da177e4
LT		 1859 goto failed_mount;
1860 }
57e94d86 1861 es = (struct ext3_super_block *)(bh->b_data + offset);
1da177e4
LT		 1862 sbi->s_es = es;
1863 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
AF		 1864 ext3_msg(sb, KERN_ERR,
1865 "error: magic mismatch");
1da177e4
LT		 1866 goto failed_mount;
1867 }
1868 }
1869
1870 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1871
1872 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1873 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1874 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1875 } else {
1876 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1877 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1878 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1879 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1880 (sbi->s_inode_size > blocksize)) {
4cf46b67
AF		 1881 ext3_msg(sb, KERN_ERR,
1882 "error: unsupported inode size: %d",
1da177e4
LT		 1883 sbi->s_inode_size);
1884 goto failed_mount;
1885 }
1886 }
1887 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1888 le32_to_cpu(es->s_log_frag_size);
1889 if (blocksize != sbi->s_frag_size) {
4cf46b67
AF		 1890 ext3_msg(sb, KERN_ERR,
1891 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1892 sbi->s_frag_size, blocksize);
1893 goto failed_mount;
1894 }
1895 sbi->s_frags_per_block = 1;
1896 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1897 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1898 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1899 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1900 goto cantfind_ext3;
1901 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1902 if (sbi->s_inodes_per_block == 0)
1903 goto cantfind_ext3;
1904 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1905 sbi->s_inodes_per_block;
1906 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1907 sbi->s_sbh = bh;
1908 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1909 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1910 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1911 for (i=0; i < 4; i++)
1912 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1913 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1914 i = le32_to_cpu(es->s_flags);
1915 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1916 sbi->s_hash_unsigned = 3;
1917 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1918#ifdef __CHAR_UNSIGNED__
1919 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1920 sbi->s_hash_unsigned = 3;
1921#else
1922 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1923#endif
5e1f8c9e 1924 }
1da177e4
LT		 1925
1926 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
AF		 1927 ext3_msg(sb, KERN_ERR,
1928 "#blocks per group too big: %lu",
1da177e4
LT		 1929 sbi->s_blocks_per_group);
1930 goto failed_mount;
1931 }
1932 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
AF		 1933 ext3_msg(sb, KERN_ERR,
1934 "error: #fragments per group too big: %lu",
1da177e4
LT		 1935 sbi->s_frags_per_group);
1936 goto failed_mount;
1937 }
1938 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
AF		 1939 ext3_msg(sb, KERN_ERR,
1940 "error: #inodes per group too big: %lu",
1da177e4
LT		 1941 sbi->s_inodes_per_group);
1942 goto failed_mount;
1943 }
1944
ad692bf3
DW		 1945 err = generic_check_addressable(sb->s_blocksize_bits,
1946 le32_to_cpu(es->s_blocks_count));
1947 if (err) {
4cf46b67
AF		 1948 ext3_msg(sb, KERN_ERR,
1949 "error: filesystem is too large to mount safely");
fcd5df35 1950 if (sizeof(sector_t) < 8)
4cf46b67
AF		 1951 ext3_msg(sb, KERN_ERR,
1952 "error: CONFIG_LBDAF not enabled");
ad692bf3 1953 ret = err;
fcd5df35
MC		 1954 goto failed_mount;
1955 }
1956
1da177e4
LT		 1957 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1958 goto cantfind_ext3;
855565e8
ES		 1959 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1960 le32_to_cpu(es->s_first_data_block) - 1)
1961 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
81a4e320 1962 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1963 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1964 GFP_KERNEL);
1965 if (sbi->s_group_desc == NULL) {
4cf46b67
AF		 1966 ext3_msg(sb, KERN_ERR,
1967 "error: not enough memory");
4569cd1b 1968 ret = -ENOMEM;
1da177e4
LT		 1969 goto failed_mount;
1970 }
1971
5df096d6 1972 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1973
1974 for (i = 0; i < db_count; i++) {
1975 block = descriptor_loc(sb, logic_sb_block, i);
1976 sbi->s_group_desc[i] = sb_bread(sb, block);
1977 if (!sbi->s_group_desc[i]) {
4cf46b67
AF		 1978 ext3_msg(sb, KERN_ERR,
1979 "error: can't read group descriptor %d", i);
1da177e4
LT		 1980 db_count = i;
1981 goto failed_mount2;
1982 }
1983 }
1984 if (!ext3_check_descriptors (sb)) {
4cf46b67
AF		 1985 ext3_msg(sb, KERN_ERR,
1986 "error: group descriptors corrupted");
1da177e4
LT		 1987 goto failed_mount2;
1988 }
1989 sbi->s_gdb_count = db_count;
1990 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1991 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1992
1da177e4
LT		 1993 /* per fileystem reservation list head & lock */
1994 spin_lock_init(&sbi->s_rsv_window_lock);
1995 sbi->s_rsv_window_root = RB_ROOT;
1996 /* Add a single, static dummy reservation to the start of the
1997 * reservation window list --- it gives us a placeholder for
1998 * append-at-start-of-list which makes the allocation logic
1999 * _much_ simpler. */
2000 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
2001 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
2002 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2003 sbi->s_rsv_window_head.rsv_goal_size = 0;
2004 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
2005
2006 /*
2007 * set up enough so that it can read an inode
2008 */
2009 sb->s_op = &ext3_sops;
2010 sb->s_export_op = &ext3_export_ops;
2011 sb->s_xattr = ext3_xattr_handlers;
2012#ifdef CONFIG_QUOTA
2013 sb->s_qcop = &ext3_qctl_operations;
2014 sb->dq_op = &ext3_quota_operations;
4018cfbc 2015 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1da177e4 2016#endif
03cb5f03 2017 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1da177e4 2018 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 2019 mutex_init(&sbi->s_orphan_lock);
96d2a495 2020 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 2021
2022 sb->s_root = NULL;
2023
2024 needs_recovery = (es->s_last_orphan != 0 ||
2025 EXT3_HAS_INCOMPAT_FEATURE(sb,
2026 EXT3_FEATURE_INCOMPAT_RECOVER));
2027
2028 /*
2029 * The first inode we look at is the journal inode. Don't try
2030 * root first: it may be modified in the journal!
2031 */
2032 if (!test_opt(sb, NOLOAD) &&
2033 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 2034 if (ext3_load_journal(sb, es, journal_devnum))
41d1a636 2035 goto failed_mount2;
1da177e4
LT		 2036 } else if (journal_inum) {
2037 if (ext3_create_journal(sb, es, journal_inum))
41d1a636 2038 goto failed_mount2;
1da177e4
LT		 2039 } else {
2040 if (!silent)
4cf46b67
AF		 2041 ext3_msg(sb, KERN_ERR,
2042 "error: no journal found. "
2043 "mounting ext3 over ext2?");
41d1a636
DM		 2044 goto failed_mount2;
2045 }
2046 err = percpu_counter_init(&sbi->s_freeblocks_counter,
908c7f19 2047 ext3_count_free_blocks(sb), GFP_KERNEL);
41d1a636
DM		 2048 if (!err) {
2049 err = percpu_counter_init(&sbi->s_freeinodes_counter,
908c7f19 2050 ext3_count_free_inodes(sb), GFP_KERNEL);
41d1a636
DM		 2051 }
2052 if (!err) {
2053 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 2054 ext3_count_dirs(sb), GFP_KERNEL);
41d1a636
DM		 2055 }
2056 if (err) {
2057 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
4569cd1b 2058 ret = err;
0216bfcf 2059 goto failed_mount3;
1da177e4
LT		 2060 }
2061
2062 /* We have now updated the journal if required, so we can
2063 * validate the data journaling mode. */
2064 switch (test_opt(sb, DATA_FLAGS)) {
2065 case 0:
2066 /* No mode set, assume a default based on the journal
2067 capabilities: ORDERED_DATA if the journal can
2068 cope, else JOURNAL_DATA */
2069 if (journal_check_available_features
2070 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 2071 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 2072 else
2073 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2074 break;
2075
2076 case EXT3_MOUNT_ORDERED_DATA:
2077 case EXT3_MOUNT_WRITEBACK_DATA:
2078 if (!journal_check_available_features
2079 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
AF		 2080 ext3_msg(sb, KERN_ERR,
2081 "error: journal does not support "
2082 "requested data journaling mode");
41d1a636 2083 goto failed_mount3;
1da177e4
LT		 2084 }
2085 default:
2086 break;
2087 }
2088
1da177e4
LT		 2089 /*
2090 * The journal_load will have done any necessary log recovery,
2091 * so we can safely mount the rest of the filesystem now.
2092 */
2093
473043dc
DH		 2094 root = ext3_iget(sb, EXT3_ROOT_INO);
2095 if (IS_ERR(root)) {
4cf46b67 2096 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 2097 ret = PTR_ERR(root);
41d1a636 2098 goto failed_mount3;
1da177e4
LT		 2099 }
2100 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2101 iput(root);
4cf46b67 2102 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
41d1a636 2103 goto failed_mount3;
1da177e4 2104 }
48fde701 2105 sb->s_root = d_make_root(root);
473043dc 2106 if (!sb->s_root) {
4cf46b67 2107 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc 2108 ret = -ENOMEM;
41d1a636 2109 goto failed_mount3;
473043dc 2110 }
1da177e4 2111
f007dbf8
ES		 2112 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2113 sb->s_flags |= MS_RDONLY;
ed505ee4 2114
1da177e4
LT		 2115 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2116 ext3_orphan_cleanup(sb, es);
2117 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
63894ab9
EG		 2118 if (needs_recovery) {
2119 ext3_mark_recovery_complete(sb, es);
4cf46b67 2120 ext3_msg(sb, KERN_INFO, "recovery complete");
63894ab9 2121 }
4cf46b67 2122 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2123 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2124 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2125 "writeback");
2126
1da177e4
LT		 2127 return 0;
2128
2129cantfind_ext3:
2130 if (!silent)
4cf46b67
AF		 2131 ext3_msg(sb, KERN_INFO,
2132 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2133 sb->s_id);
2134 goto failed_mount;
2135
0216bfcf
MC		 2136failed_mount3:
2137 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2138 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2139 percpu_counter_destroy(&sbi->s_dirs_counter);
41d1a636 2140 journal_destroy(sbi->s_journal);
1da177e4
LT		 2141failed_mount2:
2142 for (i = 0; i < db_count; i++)
2143 brelse(sbi->s_group_desc[i]);
2144 kfree(sbi->s_group_desc);
2145failed_mount:
2146#ifdef CONFIG_QUOTA
a93114e4 2147 for (i = 0; i < EXT3_MAXQUOTAS; i++)
1da177e4
LT		 2148 kfree(sbi->s_qf_names[i]);
2149#endif
2150 ext3_blkdev_remove(sbi);
2151 brelse(bh);
2152out_fail:
2153 sb->s_fs_info = NULL;
de5ce037 2154 kfree(sbi->s_blockgroup_lock);
1da177e4 2155 kfree(sbi);
473043dc 2156 return ret;
1da177e4
LT		 2157}
2158
2159/*
2160 * Setup any per-fs journal parameters now. We'll do this both on
2161 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2162 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2163 */
2164static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2165{
2166 struct ext3_sb_info *sbi = EXT3_SB(sb);
2167
2168 if (sbi->s_commit_interval)
2169 journal->j_commit_interval = sbi->s_commit_interval;
2170 /* We could also set up an ext3-specific default for the commit
2171 * interval here, but for now we'll just fall back to the jbd
2172 * default. */
2173
2174 spin_lock(&journal->j_state_lock);
2175 if (test_opt(sb, BARRIER))
2176 journal->j_flags |= JFS_BARRIER;
2177 else
2178 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2179 if (test_opt(sb, DATA_ERR_ABORT))
2180 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2181 else
2182 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2183 spin_unlock(&journal->j_state_lock);
2184}
2185
eee194e7
ES		 2186static journal_t *ext3_get_journal(struct super_block *sb,
2187 unsigned int journal_inum)
1da177e4
LT		 2188{
2189 struct inode *journal_inode;
2190 journal_t *journal;
2191
2192 /* First, test for the existence of a valid inode on disk. Bad
2193 * things happen if we iget() an unused inode, as the subsequent
2194 * iput() will try to delete it. */
2195
473043dc
DH		 2196 journal_inode = ext3_iget(sb, journal_inum);
2197 if (IS_ERR(journal_inode)) {
4cf46b67 2198 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2199 return NULL;
2200 }
2201 if (!journal_inode->i_nlink) {
2202 make_bad_inode(journal_inode);
2203 iput(journal_inode);
4cf46b67 2204 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2205 return NULL;
2206 }
2207
2208 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2209 journal_inode, journal_inode->i_size);
473043dc 2210 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2211 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2212 iput(journal_inode);
2213 return NULL;
2214 }
2215
2216 journal = journal_init_inode(journal_inode);
2217 if (!journal) {
4cf46b67 2218 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2219 iput(journal_inode);
2220 return NULL;
2221 }
2222 journal->j_private = sb;
2223 ext3_init_journal_params(sb, journal);
2224 return journal;
2225}
2226
2227static journal_t *ext3_get_dev_journal(struct super_block *sb,
2228 dev_t j_dev)
2229{
2230 struct buffer_head * bh;
2231 journal_t *journal;
43d23f90 2232 ext3_fsblk_t start;
1c2bf374 2233 ext3_fsblk_t len;
1da177e4 2234 int hblock, blocksize;
43d23f90 2235 ext3_fsblk_t sb_block;
1da177e4
LT		 2236 unsigned long offset;
2237 struct ext3_super_block * es;
2238 struct block_device *bdev;
2239
4cf46b67 2240 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2241 if (bdev == NULL)
2242 return NULL;
2243
1da177e4 2244 blocksize = sb->s_blocksize;
e1defc4f 2245 hblock = bdev_logical_block_size(bdev);
1da177e4 2246 if (blocksize < hblock) {
4cf46b67
AF		 2247 ext3_msg(sb, KERN_ERR,
2248 "error: blocksize too small for journal device");
1da177e4
LT		 2249 goto out_bdev;
2250 }
2251
2252 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2253 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2254 set_blocksize(bdev, blocksize);
2255 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
AF		 2256 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2257 "external journal");
1da177e4
LT		 2258 goto out_bdev;
2259 }
2260
57e94d86 2261 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 2262 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2263 !(le32_to_cpu(es->s_feature_incompat) &
2264 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
AF		 2265 ext3_msg(sb, KERN_ERR, "error: external journal has "
2266 "bad superblock");
1da177e4
LT		 2267 brelse(bh);
2268 goto out_bdev;
2269 }
2270
2271 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2272 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2273 brelse(bh);
2274 goto out_bdev;
2275 }
2276
2277 len = le32_to_cpu(es->s_blocks_count);
2278 start = sb_block + 1;
2279 brelse(bh); /* we're done with the superblock */
2280
2281 journal = journal_init_dev(bdev, sb->s_bdev,
2282 start, len, blocksize);
2283 if (!journal) {
4cf46b67
AF		 2284 ext3_msg(sb, KERN_ERR,
2285 "error: failed to create device journal");
1da177e4
LT		 2286 goto out_bdev;
2287 }
2288 journal->j_private = sb;
d03e1292
ZL		 2289 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2290 if (bh_submit_read(journal->j_sb_buffer)) {
2291 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2292 goto out_journal;
2293 }
1da177e4
LT		 2294 }
2295 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
AF		 2296 ext3_msg(sb, KERN_ERR,
2297 "error: external journal has more than one "
2298 "user (unsupported) - %d",
1da177e4
LT		 2299 be32_to_cpu(journal->j_superblock->s_nr_users));
2300 goto out_journal;
2301 }
2302 EXT3_SB(sb)->journal_bdev = bdev;
2303 ext3_init_journal_params(sb, journal);
2304 return journal;
2305out_journal:
2306 journal_destroy(journal);
2307out_bdev:
2308 ext3_blkdev_put(bdev);
2309 return NULL;
2310}
2311
71b96257
JL		 2312static int ext3_load_journal(struct super_block *sb,
2313 struct ext3_super_block *es,
2314 unsigned long journal_devnum)
1da177e4
LT		 2315{
2316 journal_t *journal;
eee194e7 2317 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2318 dev_t journal_dev;
1da177e4
LT		 2319 int err = 0;
2320 int really_read_only;
2321
71b96257
JL		 2322 if (journal_devnum &&
2323 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
AF		 2324 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2325 "numbers have changed");
71b96257
JL		 2326 journal_dev = new_decode_dev(journal_devnum);
2327 } else
2328 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2329
1da177e4
LT		 2330 really_read_only = bdev_read_only(sb->s_bdev);
2331
2332 /*
2333 * Are we loading a blank journal or performing recovery after a
2334 * crash? For recovery, we need to check in advance whether we
2335 * can get read-write access to the device.
2336 */
2337
2338 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2339 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2340 ext3_msg(sb, KERN_INFO,
2341 "recovery required on readonly filesystem");
1da177e4 2342 if (really_read_only) {
4cf46b67
AF		 2343 ext3_msg(sb, KERN_ERR, "error: write access "
2344 "unavailable, cannot proceed");
1da177e4
LT		 2345 return -EROFS;
2346 }
4cf46b67
AF		 2347 ext3_msg(sb, KERN_INFO,
2348 "write access will be enabled during recovery");
1da177e4
LT		 2349 }
2350 }
2351
2352 if (journal_inum && journal_dev) {
4cf46b67
AF		 2353 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2354 "and inode journals");
1da177e4
LT		 2355 return -EINVAL;
2356 }
2357
2358 if (journal_inum) {
2359 if (!(journal = ext3_get_journal(sb, journal_inum)))
2360 return -EINVAL;
2361 } else {
2362 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2363 return -EINVAL;
2364 }
2365
0636c73e
ES		 2366 if (!(journal->j_flags & JFS_BARRIER))
2367 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2368
1da177e4
LT		 2369 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2370 err = journal_update_format(journal);
2371 if (err) {
4cf46b67 2372 ext3_msg(sb, KERN_ERR, "error updating journal");
1da177e4
LT		 2373 journal_destroy(journal);
2374 return err;
2375 }
2376 }
2377
2378 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2379 err = journal_wipe(journal, !really_read_only);
2380 if (!err)
2381 err = journal_load(journal);
2382
2383 if (err) {
4cf46b67 2384 ext3_msg(sb, KERN_ERR, "error loading journal");
1da177e4
LT		 2385 journal_destroy(journal);
2386 return err;
2387 }
2388
2389 EXT3_SB(sb)->s_journal = journal;
2390 ext3_clear_journal_err(sb, es);
71b96257 2391
31d710a7 2392 if (!really_read_only && journal_devnum &&
71b96257
JL		 2393 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2394 es->s_journal_dev = cpu_to_le32(journal_devnum);
71b96257
JL		 2395
2396 /* Make sure we flush the recovery flag to disk. */
2397 ext3_commit_super(sb, es, 1);
2398 }
2399
1da177e4
LT		 2400 return 0;
2401}
2402
4cf46b67
AF		 2403static int ext3_create_journal(struct super_block *sb,
2404 struct ext3_super_block *es,
eee194e7 2405 unsigned int journal_inum)
1da177e4
LT		 2406{
2407 journal_t *journal;
952d9de1 2408 int err;
1da177e4
LT		 2409
2410 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2411 ext3_msg(sb, KERN_ERR,
2412 "error: readonly filesystem when trying to "
2413 "create journal");
1da177e4
LT		 2414 return -EROFS;
2415 }
2416
952d9de1
BP		 2417 journal = ext3_get_journal(sb, journal_inum);
2418 if (!journal)
1da177e4
LT		 2419 return -EINVAL;
2420
4cf46b67 2421 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
1da177e4
LT		 2422 journal_inum);
2423
952d9de1
BP		 2424 err = journal_create(journal);
2425 if (err) {
4cf46b67 2426 ext3_msg(sb, KERN_ERR, "error creating journal");
1da177e4
LT		 2427 journal_destroy(journal);
2428 return -EIO;
2429 }
2430
2431 EXT3_SB(sb)->s_journal = journal;
2432
2433 ext3_update_dynamic_rev(sb);
2434 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2435 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2436
2437 es->s_journal_inum = cpu_to_le32(journal_inum);
1da177e4
LT		 2438
2439 /* Make sure we flush the recovery flag to disk. */
2440 ext3_commit_super(sb, es, 1);
2441
2442 return 0;
2443}
2444
c4be0c1d
TS		 2445static int ext3_commit_super(struct super_block *sb,
2446 struct ext3_super_block *es,
1da177e4
LT		 2447 int sync)
2448{
2449 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2450 int error = 0;
1da177e4
LT		 2451
2452 if (!sbh)
c4be0c1d 2453 return error;
dff6825e
DW		 2454
2455 if (buffer_write_io_error(sbh)) {
2456 /*
2457 * Oh, dear. A previous attempt to write the
2458 * superblock failed. This could happen because the
2459 * USB device was yanked out. Or it could happen to
2460 * be a transient write error and maybe the block will
2461 * be remapped. Nothing we can do but to retry the
2462 * write and hope for the best.
2463 */
2464 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2465 "superblock detected");
2466 clear_buffer_write_io_error(sbh);
2467 set_buffer_uptodate(sbh);
2468 }
96ec2e0a
TT		 2469 /*
2470 * If the file system is mounted read-only, don't update the
2471 * superblock write time. This avoids updating the superblock
2472 * write time when we are mounting the root file system
2473 * read/only but we need to replay the journal; at that point,
2474 * for people who are east of GMT and who make their clock
2475 * tick in localtime for Windows bug-for-bug compatibility,
2476 * the clock is set in the future, and this will cause e2fsck
2477 * to complain and force a full file system check.
2478 */
2479 if (!(sb->s_flags & MS_RDONLY))
2480 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2481 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2482 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2483 BUFFER_TRACE(sbh, "marking dirty");
2484 mark_buffer_dirty(sbh);
dff6825e 2485 if (sync) {
c4be0c1d 2486 error = sync_dirty_buffer(sbh);
dff6825e
DW		 2487 if (buffer_write_io_error(sbh)) {
2488 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2489 "superblock");
2490 clear_buffer_write_io_error(sbh);
2491 set_buffer_uptodate(sbh);
2492 }
2493 }
c4be0c1d 2494 return error;
1da177e4
LT		 2495}
2496
2497
2498/*
2499 * Have we just finished recovery? If so, and if we are mounting (or
2500 * remounting) the filesystem readonly, then we will end up with a
2501 * consistent fs on disk. Record that fact.
2502 */
2503static void ext3_mark_recovery_complete(struct super_block * sb,
2504 struct ext3_super_block * es)
2505{
2506 journal_t *journal = EXT3_SB(sb)->s_journal;
2507
2508 journal_lock_updates(journal);
2d7c820e
HK		 2509 if (journal_flush(journal) < 0)
2510 goto out;
2511
1da177e4
LT		 2512 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2513 sb->s_flags & MS_RDONLY) {
2514 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2515 ext3_commit_super(sb, es, 1);
2516 }
2d7c820e
HK		 2517
2518out:
1da177e4
LT		 2519 journal_unlock_updates(journal);
2520}
2521
2522/*
2523 * If we are mounting (or read-write remounting) a filesystem whose journal
2524 * has recorded an error from a previous lifetime, move that error to the
2525 * main filesystem now.
2526 */
4cf46b67
AF		 2527static void ext3_clear_journal_err(struct super_block *sb,
2528 struct ext3_super_block *es)
1da177e4
LT		 2529{
2530 journal_t *journal;
2531 int j_errno;
2532 const char *errstr;
2533
2534 journal = EXT3_SB(sb)->s_journal;
2535
2536 /*
2537 * Now check for any error status which may have been recorded in the
2538 * journal by a prior ext3_error() or ext3_abort()
2539 */
2540
2541 j_errno = journal_errno(journal);
2542 if (j_errno) {
2543 char nbuf[16];
2544
2545 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2546 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2547 "from previous mount: %s", errstr);
e05b6b52 2548 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2549 "filesystem check.");
2550
2551 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2552 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2553 ext3_commit_super (sb, es, 1);
2554
2555 journal_clear_err(journal);
2556 }
2557}
2558
2559/*
2560 * Force the running and committing transactions to commit,
2561 * and wait on the commit.
2562 */
2563int ext3_force_commit(struct super_block *sb)
2564{
2565 journal_t *journal;
2566 int ret;
2567
2568 if (sb->s_flags & MS_RDONLY)
2569 return 0;
2570
2571 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2572 ret = ext3_journal_force_commit(journal);
2573 return ret;
2574}
2575
1da177e4
LT		 2576static int ext3_sync_fs(struct super_block *sb, int wait)
2577{
02ac597c 2578 tid_t target;
c87591b7 2579
785c4bcc 2580 trace_ext3_sync_fs(sb, wait);
a1177825
JK		 2581 /*
2582 * Writeback quota in non-journalled quota case - journalled quota has
2583 * no dirty dquots
2584 */
2585 dquot_writeback_dquots(sb, -1);
02ac597c
JK		 2586 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2587 if (wait)
2588 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2589 }
1da177e4
LT		 2590 return 0;
2591}
2592
2593/*
2594 * LVM calls this function before a (read-only) snapshot is created. This
2595 * gives us a chance to flush the journal completely and mark the fs clean.
2596 */
c4be0c1d 2597static int ext3_freeze(struct super_block *sb)
1da177e4 2598{
c4be0c1d
TS		 2599 int error = 0;
2600 journal_t *journal;
1da177e4
LT		 2601
2602 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2603 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2604
2605 /* Now we set up the journal barrier. */
2606 journal_lock_updates(journal);
2d7c820e
HK		 2607
2608 /*
2609 * We don't want to clear needs_recovery flag when we failed
2610 * to flush the journal.
2611 */
c4be0c1d
TS		 2612 error = journal_flush(journal);
2613 if (error < 0)
2614 goto out;
1da177e4
LT		 2615
2616 /* Journal blocked and flushed, clear needs_recovery flag. */
2617 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2618 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2619 if (error)
2620 goto out;
1da177e4 2621 }
c4be0c1d
TS		 2622 return 0;
2623
2624out:
2625 journal_unlock_updates(journal);
2626 return error;
1da177e4
LT		 2627}
2628
2629/*
2630 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2631 * flag here, even though the filesystem is not technically dirty yet.
2632 */
c4be0c1d 2633static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2634{
2635 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 2636 /* Reser the needs_recovery flag before the fs is unlocked. */
2637 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2638 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
1da177e4
LT		 2639 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2640 }
c4be0c1d 2641 return 0;
1da177e4
LT		 2642}
2643
2644static int ext3_remount (struct super_block * sb, int * flags, char * data)
2645{
2646 struct ext3_super_block * es;
2647 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2648 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2649 unsigned long old_sb_flags;
2650 struct ext3_mount_options old_opts;
c79d967d 2651 int enable_quota = 0;
08c6a96f
JK		 2652 int err;
2653#ifdef CONFIG_QUOTA
2654 int i;
2655#endif
2656
02b9984d
TT		 2657 sync_filesystem(sb);
2658
08c6a96f
JK		 2659 /* Store the original options */
2660 old_sb_flags = sb->s_flags;
2661 old_opts.s_mount_opt = sbi->s_mount_opt;
2662 old_opts.s_resuid = sbi->s_resuid;
2663 old_opts.s_resgid = sbi->s_resgid;
2664 old_opts.s_commit_interval = sbi->s_commit_interval;
2665#ifdef CONFIG_QUOTA
2666 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a93114e4 2667 for (i = 0; i < EXT3_MAXQUOTAS; i++)
f56426ae
JK		 2668 if (sbi->s_qf_names[i]) {
2669 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2670 GFP_KERNEL);
2671 if (!old_opts.s_qf_names[i]) {
2672 int j;
2673
2674 for (j = 0; j < i; j++)
2675 kfree(old_opts.s_qf_names[j]);
2676 return -ENOMEM;
2677 }
2678 } else
2679 old_opts.s_qf_names[i] = NULL;
08c6a96f 2680#endif
1da177e4
LT		 2681
2682 /*
2683 * Allow the "check" option to be passed as a remount option.
2684 */
71b96257 2685 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2686 err = -EINVAL;
2687 goto restore_opts;
2688 }
1da177e4 2689
e3c96435 2690 if (test_opt(sb, ABORT))
e05b6b52 2691 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2692
2693 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 2694 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 2695
2696 es = sbi->s_es;
2697
2698 ext3_init_journal_params(sb, sbi->s_journal);
2699
2700 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2701 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
e3c96435 2702 if (test_opt(sb, ABORT)) {
08c6a96f
JK		 2703 err = -EROFS;
2704 goto restore_opts;
2705 }
1da177e4
LT		 2706
2707 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 2708 err = dquot_suspend(sb, -1);
2709 if (err < 0)
c79d967d 2710 goto restore_opts;
c79d967d 2711
1da177e4
LT		 2712 /*
2713 * First of all, the unconditional stuff we have to do
2714 * to disable replay of the journal when we next remount
2715 */
2716 sb->s_flags |= MS_RDONLY;
2717
2718 /*
2719 * OK, test if we are remounting a valid rw partition
2720 * readonly, and if so set the rdonly flag and then
2721 * mark the partition as valid again.
2722 */
2723 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2724 (sbi->s_mount_state & EXT3_VALID_FS))
2725 es->s_state = cpu_to_le16(sbi->s_mount_state);
2726
2727 ext3_mark_recovery_complete(sb, es);
2728 } else {
2729 __le32 ret;
2730 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2731 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
AF		 2732 ext3_msg(sb, KERN_WARNING,
2733 "warning: couldn't remount RDWR "
2734 "because of unsupported optional "
2735 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2736 err = -EROFS;
2737 goto restore_opts;
1da177e4 2738 }
ea9a05a1
ES		 2739
2740 /*
2741 * If we have an unprocessed orphan list hanging
2742 * around from a previously readonly bdev mount,
1cde201d 2743 * require a full umount & mount for now.
ea9a05a1
ES		 2744 */
2745 if (es->s_last_orphan) {
4cf46b67 2746 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2747 "remount RDWR because of unprocessed "
2748 "orphan inode list. Please "
1cde201d 2749 "umount & mount instead.");
ea9a05a1
ES		 2750 err = -EINVAL;
2751 goto restore_opts;
2752 }
2753
1da177e4
LT		 2754 /*
2755 * Mounting a RDONLY partition read-write, so reread
2756 * and store the current valid flag. (It may have
2757 * been changed by e2fsck since we originally mounted
2758 * the partition.)
2759 */
2760 ext3_clear_journal_err(sb, es);
2761 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2762 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2763 goto restore_opts;
1da177e4
LT		 2764 if (!ext3_setup_super (sb, es, 0))
2765 sb->s_flags &= ~MS_RDONLY;
c79d967d 2766 enable_quota = 1;
1da177e4
LT		 2767 }
2768 }
08c6a96f
JK		 2769#ifdef CONFIG_QUOTA
2770 /* Release old quota file names */
a93114e4 2771 for (i = 0; i < EXT3_MAXQUOTAS; i++)
f56426ae 2772 kfree(old_opts.s_qf_names[i]);
08c6a96f 2773#endif
c79d967d 2774 if (enable_quota)
0f0dd62f 2775 dquot_resume(sb, -1);
1da177e4 2776 return 0;
08c6a96f
JK		 2777restore_opts:
2778 sb->s_flags = old_sb_flags;
2779 sbi->s_mount_opt = old_opts.s_mount_opt;
2780 sbi->s_resuid = old_opts.s_resuid;
2781 sbi->s_resgid = old_opts.s_resgid;
2782 sbi->s_commit_interval = old_opts.s_commit_interval;
2783#ifdef CONFIG_QUOTA
2784 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a93114e4 2785 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
f56426ae 2786 kfree(sbi->s_qf_names[i]);
08c6a96f
JK		 2787 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2788 }
2789#endif
2790 return err;
1da177e4
LT		 2791}
2792
726c3342 2793static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2794{
726c3342 2795 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2796 struct ext3_sb_info *sbi = EXT3_SB(sb);
2797 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2798 u64 fsid;
1da177e4 2799
a71ce8c6
BP		 2800 if (test_opt(sb, MINIX_DF)) {
2801 sbi->s_overhead_last = 0;
2802 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2803 unsigned long ngroups = sbi->s_groups_count, i;
2804 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2805 smp_rmb();
2806
2807 /*
a71ce8c6
BP		 2808 * Compute the overhead (FS structures). This is constant
2809 * for a given filesystem unless the number of block groups
2810 * changes so we cache the previous value until it does.
1da177e4
LT		 2811 */
2812
2813 /*
2814 * All of the blocks before first_data_block are
2815 * overhead
2816 */
2817 overhead = le32_to_cpu(es->s_first_data_block);
2818
2819 /*
2820 * Add the overhead attributed to the superblock and
2821 * block group descriptors. If the sparse superblocks
2822 * feature is turned on, then not all groups have this.
2823 */
2824 for (i = 0; i < ngroups; i++) {
2825 overhead += ext3_bg_has_super(sb, i) +
2826 ext3_bg_num_gdb(sb, i);
2827 cond_resched();
2828 }
2829
2830 /*
2831 * Every block group has an inode bitmap, a block
2832 * bitmap, and an inode table.
2833 */
a71ce8c6 2834 overhead += ngroups * (2 + sbi->s_itb_per_group);
2046fd18 2835
e6d8fb34
CTC		 2836 /* Add the internal journal blocks as well */
2837 if (sbi->s_journal && !sbi->journal_bdev)
2838 overhead += sbi->s_journal->j_maxlen;
2046fd18 2839
a71ce8c6
BP		 2840 sbi->s_overhead_last = overhead;
2841 smp_wmb();
2842 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2843 }
2844
2845 buf->f_type = EXT3_SUPER_MAGIC;
2846 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2847 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2848 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2849 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2850 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2851 buf->f_bavail = 0;
2852 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2853 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2854 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2855 fsid = le64_to_cpup((void *)es->s_uuid) ^
2856 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2857 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2858 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2859 return 0;
2860}
2861
2862/* Helper function for writing quotas on sync - we need to start transaction before quota file
2863 * is locked for write. Otherwise the are possible deadlocks:
2864 * Process 1 Process 2
2865 * ext3_create() quota_sync()
2866 * journal_start() write_dquot()
871a2931 2867 * dquot_initialize() down(dqio_mutex)
d3be915f 2868 * down(dqio_mutex) journal_start()
1da177e4
LT		 2869 *
2870 */
2871
2872#ifdef CONFIG_QUOTA
2873
2874static inline struct inode *dquot_to_inode(struct dquot *dquot)
2875{
4c376dca 2876 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
1da177e4
LT		 2877}
2878
1da177e4
LT		 2879static int ext3_write_dquot(struct dquot *dquot)
2880{
2881 int ret, err;
2882 handle_t *handle;
2883 struct inode *inode;
2884
2885 inode = dquot_to_inode(dquot);
2886 handle = ext3_journal_start(inode,
1f54587b 2887 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2888 if (IS_ERR(handle))
2889 return PTR_ERR(handle);
2890 ret = dquot_commit(dquot);
2891 err = ext3_journal_stop(handle);
2892 if (!ret)
2893 ret = err;
2894 return ret;
2895}
2896
2897static int ext3_acquire_dquot(struct dquot *dquot)
2898{
2899 int ret, err;
2900 handle_t *handle;
2901
2902 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2903 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2904 if (IS_ERR(handle))
2905 return PTR_ERR(handle);
2906 ret = dquot_acquire(dquot);
2907 err = ext3_journal_stop(handle);
2908 if (!ret)
2909 ret = err;
2910 return ret;
2911}
2912
2913static int ext3_release_dquot(struct dquot *dquot)
2914{
2915 int ret, err;
2916 handle_t *handle;
2917
2918 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2919 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2920 if (IS_ERR(handle)) {
2921 /* Release dquot anyway to avoid endless cycle in dqput() */
2922 dquot_release(dquot);
1da177e4 2923 return PTR_ERR(handle);
9c3013e9 2924 }
1da177e4
LT		 2925 ret = dquot_release(dquot);
2926 err = ext3_journal_stop(handle);
2927 if (!ret)
2928 ret = err;
2929 return ret;
2930}
2931
2932static int ext3_mark_dquot_dirty(struct dquot *dquot)
2933{
99aeaf63 2934 /* Are we journaling quotas? */
1da177e4
LT		 2935 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2936 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2937 dquot_mark_dquot_dirty(dquot);
2938 return ext3_write_dquot(dquot);
2939 } else {
2940 return dquot_mark_dquot_dirty(dquot);
2941 }
2942}
2943
2944static int ext3_write_info(struct super_block *sb, int type)
2945{
2946 int ret, err;
2947 handle_t *handle;
2948
2949 /* Data block + inode block */
2950 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2951 if (IS_ERR(handle))
2952 return PTR_ERR(handle);
2953 ret = dquot_commit_info(sb, type);
2954 err = ext3_journal_stop(handle);
2955 if (!ret)
2956 ret = err;
2957 return ret;
2958}
2959
2960/*
2961 * Turn on quotas during mount time - we need to find
2962 * the quota file and such...
2963 */
2964static int ext3_quota_on_mount(struct super_block *sb, int type)
2965{
287a8095
CH		 2966 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2967 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2968}
2969
2970/*
2971 * Standard function to be called on quota_on
2972 */
2973static int ext3_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 2974 struct path *path)
1da177e4
LT		 2975{
2976 int err;
1da177e4 2977
1f54587b
JK		 2978 if (!test_opt(sb, QUOTA))
2979 return -EINVAL;
9cfe7b90 2980
1da177e4 2981 /* Quotafile not on the same filesystem? */
d8c9584e 2982 if (path->dentry->d_sb != sb)
1da177e4 2983 return -EXDEV;
9cfe7b90
JK		 2984 /* Journaling quota? */
2985 if (EXT3_SB(sb)->s_qf_names[type]) {
2986 /* Quotafile not of fs root? */
f00c9e44 2987 if (path->dentry->d_parent != sb->s_root)
4cf46b67
AF		 2988 ext3_msg(sb, KERN_WARNING,
2989 "warning: Quota file not on filesystem root. "
2990 "Journaled quota will not work.");
9cfe7b90
JK		 2991 }
2992
2993 /*
2994 * When we journal data on quota file, we have to flush journal to see
2995 * all updates to the file when we bypass pagecache...
2996 */
f00c9e44 2997 if (ext3_should_journal_data(path->dentry->d_inode)) {
9cfe7b90
JK		 2998 /*
2999 * We don't need to lock updates but journal_flush() could
3000 * otherwise be livelocked...
3001 */
3002 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 3003 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 3004 journal_unlock_updates(EXT3_SB(sb)->s_journal);
f00c9e44 3005 if (err)
2d7c820e 3006 return err;
9cfe7b90
JK		 3007 }
3008
f00c9e44 3009 return dquot_quota_on(sb, type, format_id, path);
1da177e4
LT		 3010}
3011
3012/* Read data from quotafile - avoid pagecache and such because we cannot afford
3013 * acquiring the locks... As quota files are never truncated and quota code
25985edc 3014 * itself serializes the operations (and no one else should touch the files)
1da177e4
LT		 3015 * we don't have to be afraid of races */
3016static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
3017 size_t len, loff_t off)
3018{
3019 struct inode *inode = sb_dqopt(sb)->files[type];
3020 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3021 int err = 0;
3022 int offset = off & (sb->s_blocksize - 1);
3023 int tocopy;
3024 size_t toread;
3025 struct buffer_head *bh;
3026 loff_t i_size = i_size_read(inode);
3027
3028 if (off > i_size)
3029 return 0;
3030 if (off+len > i_size)
3031 len = i_size-off;
3032 toread = len;
3033 while (toread > 0) {
3034 tocopy = sb->s_blocksize - offset < toread ?
3035 sb->s_blocksize - offset : toread;
3036 bh = ext3_bread(NULL, inode, blk, 0, &err);
3037 if (err)
3038 return err;
3039 if (!bh) /* A hole? */
3040 memset(data, 0, tocopy);
3041 else
3042 memcpy(data, bh->b_data+offset, tocopy);
3043 brelse(bh);
3044 offset = 0;
3045 toread -= tocopy;
3046 data += tocopy;
3047 blk++;
3048 }
3049 return len;
3050}
3051
3052/* Write to quotafile (we know the transaction is already started and has
3053 * enough credits) */
3054static ssize_t ext3_quota_write(struct super_block *sb, int type,
3055 const char *data, size_t len, loff_t off)
3056{
3057 struct inode *inode = sb_dqopt(sb)->files[type];
3058 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3059 int err = 0;
3060 int offset = off & (sb->s_blocksize - 1);
1da177e4 3061 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
1da177e4
LT		 3062 struct buffer_head *bh;
3063 handle_t *handle = journal_current_handle();
3064
9c3013e9 3065 if (!handle) {
4cf46b67
AF		 3066 ext3_msg(sb, KERN_WARNING,
3067 "warning: quota write (off=%llu, len=%llu)"
3068 " cancelled because transaction is not started.",
9c3013e9
JK		 3069 (unsigned long long)off, (unsigned long long)len);
3070 return -EIO;
3071 }
e5472147
DM		 3072
3073 /*
3074 * Since we account only one data block in transaction credits,
3075 * then it is impossible to cross a block boundary.
3076 */
3077 if (sb->s_blocksize - offset < len) {
3078 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3079 " cancelled because not block aligned",
3080 (unsigned long long)off, (unsigned long long)len);
3081 return -EIO;
3082 }
e5472147
DM		 3083 bh = ext3_bread(handle, inode, blk, 1, &err);
3084 if (!bh)
3085 goto out;
3086 if (journal_quota) {
3087 err = ext3_journal_get_write_access(handle, bh);
3088 if (err) {
3089 brelse(bh);
1da177e4 3090 goto out;
1da177e4 3091 }
1da177e4 3092 }
e5472147
DM		 3093 lock_buffer(bh);
3094 memcpy(bh->b_data+offset, data, len);
3095 flush_dcache_page(bh->b_page);
3096 unlock_buffer(bh);
3097 if (journal_quota)
3098 err = ext3_journal_dirty_metadata(handle, bh);
3099 else {
3100 /* Always do at least ordered writes for quotas */
3101 err = ext3_journal_dirty_data(handle, bh);
3102 mark_buffer_dirty(bh);
3103 }
3104 brelse(bh);
1da177e4 3105out:
905c3937 3106 if (err)
1da177e4 3107 return err;
e5472147
DM		 3108 if (inode->i_size < off + len) {
3109 i_size_write(inode, off + len);
1da177e4
LT		 3110 EXT3_I(inode)->i_disksize = inode->i_size;
3111 }
3112 inode->i_version++;
3113 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3114 ext3_mark_inode_dirty(handle, inode);
e5472147 3115 return len;
1da177e4
LT		 3116}
3117
3118#endif
3119
152a0836
AV		 3120static struct dentry *ext3_mount(struct file_system_type *fs_type,
3121 int flags, const char *dev_name, void *data)
1da177e4 3122{
152a0836 3123 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
1da177e4
LT		 3124}
3125
3126static struct file_system_type ext3_fs_type = {
3127 .owner = THIS_MODULE,
3128 .name = "ext3",
152a0836 3129 .mount = ext3_mount,
1da177e4
LT		 3130 .kill_sb = kill_block_super,
3131 .fs_flags = FS_REQUIRES_DEV,
3132};
7f78e035 3133MODULE_ALIAS_FS("ext3");
1da177e4
LT		 3134
3135static int __init init_ext3_fs(void)
3136{
3137 int err = init_ext3_xattr();
3138 if (err)
3139 return err;
3140 err = init_inodecache();
3141 if (err)
3142 goto out1;
3143 err = register_filesystem(&ext3_fs_type);
3144 if (err)
3145 goto out;
3146 return 0;
3147out:
3148 destroy_inodecache();
3149out1:
e9ad5620 3150 exit_ext3_xattr();
1da177e4
LT		 3151 return err;
3152}
3153
3154static void __exit exit_ext3_fs(void)
3155{
3156 unregister_filesystem(&ext3_fs_type);
3157 destroy_inodecache();
3158 exit_ext3_xattr();
3159}
3160
3161MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3162MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3163MODULE_LICENSE("GPL");
3164module_init(init_ext3_fs)
3165module_exit(exit_ext3_fs)
Linux kernel - Deliverables
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