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Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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
LT		 19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
a5694255 32#include <linux/exportfs.h>
1da177e4
LT		 33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
8fc2751b 38#include <linux/seq_file.h>
3fc74269 39#include <linux/log2.h>
381be254 40
1da177e4 41#include <asm/uaccess.h>
381be254 42
1da177e4
LT		 43#include "xattr.h"
44#include "acl.h"
381be254 45#include "namei.h"
1da177e4 46
bbae8bcc
LT		 47#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
48 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
49#else
50 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
51#endif
52
71b96257
JL		 53static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
54 unsigned long journal_devnum);
1da177e4 55static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 56 unsigned int);
c4be0c1d
TS		 57static int ext3_commit_super(struct super_block *sb,
58 struct ext3_super_block *es,
1da177e4
LT		 59 int sync);
60static void ext3_mark_recovery_complete(struct super_block * sb,
61 struct ext3_super_block * es);
62static void ext3_clear_journal_err(struct super_block * sb,
63 struct ext3_super_block * es);
64static int ext3_sync_fs(struct super_block *sb, int wait);
65static const char *ext3_decode_error(struct super_block * sb, int errno,
66 char nbuf[16]);
67static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 68static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 69static int ext3_unfreeze(struct super_block *sb);
c4be0c1d 70static int ext3_freeze(struct super_block *sb);
1da177e4 71
ae6ddcc5 72/*
1da177e4
LT		 73 * Wrappers for journal_start/end.
74 *
75 * The only special thing we need to do here is to make sure that all
76 * journal_end calls result in the superblock being marked dirty, so
77 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 78 * appropriate.
1da177e4
LT		 79 */
80handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
81{
82 journal_t *journal;
83
84 if (sb->s_flags & MS_RDONLY)
85 return ERR_PTR(-EROFS);
86
87 /* Special case here: if the journal has aborted behind our
88 * backs (eg. EIO in the commit thread), then we still need to
89 * take the FS itself readonly cleanly. */
90 journal = EXT3_SB(sb)->s_journal;
91 if (is_journal_aborted(journal)) {
e05b6b52 92 ext3_abort(sb, __func__,
1da177e4
LT		 93 "Detected aborted journal");
94 return ERR_PTR(-EROFS);
95 }
96
97 return journal_start(journal, nblocks);
98}
99
ae6ddcc5 100/*
1da177e4
LT		 101 * The only special thing we need to do here is to make sure that all
102 * journal_stop calls result in the superblock being marked dirty, so
103 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 104 * appropriate.
1da177e4
LT		 105 */
106int __ext3_journal_stop(const char *where, handle_t *handle)
107{
108 struct super_block *sb;
109 int err;
110 int rc;
111
112 sb = handle->h_transaction->t_journal->j_private;
113 err = handle->h_err;
114 rc = journal_stop(handle);
115
116 if (!err)
117 err = rc;
118 if (err)
119 __ext3_std_error(sb, where, err);
120 return err;
121}
122
123void ext3_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err)
125{
126 char nbuf[16];
127 const char *errstr = ext3_decode_error(NULL, err, nbuf);
128
129 if (bh)
130 BUFFER_TRACE(bh, "abort");
131
132 if (!handle->h_err)
133 handle->h_err = err;
134
135 if (is_handle_aborted(handle))
136 return;
137
4cf46b67
AF		 138 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
139 caller, errstr, err_fn);
1da177e4
LT		 140
141 journal_abort_handle(handle);
142}
143
4cf46b67
AF		 144void ext3_msg(struct super_block *sb, const char *prefix,
145 const char *fmt, ...)
146{
147 va_list args;
148
149 va_start(args, fmt);
150 printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
151 vprintk(fmt, args);
152 printk("\n");
153 va_end(args);
154}
155
1da177e4
LT		 156/* Deal with the reporting of failure conditions on a filesystem such as
157 * inconsistencies detected or read IO failures.
158 *
159 * On ext2, we can store the error state of the filesystem in the
160 * superblock. That is not possible on ext3, because we may have other
161 * write ordering constraints on the superblock which prevent us from
162 * writing it out straight away; and given that the journal is about to
163 * be aborted, we can't rely on the current, or future, transactions to
164 * write out the superblock safely.
165 *
166 * We'll just use the journal_abort() error code to record an error in
d6b198bc 167 * the journal instead. On recovery, the journal will complain about
1da177e4
LT		 168 * that error until we've noted it down and cleared it.
169 */
170
171static void ext3_handle_error(struct super_block *sb)
172{
173 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
174
175 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
176 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
177
178 if (sb->s_flags & MS_RDONLY)
179 return;
180
7543fc7b 181 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 182 journal_t *journal = EXT3_SB(sb)->s_journal;
183
e3c96435 184 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
1da177e4
LT		 185 if (journal)
186 journal_abort(journal, -EIO);
187 }
7543fc7b 188 if (test_opt (sb, ERRORS_RO)) {
4cf46b67
AF		 189 ext3_msg(sb, KERN_CRIT,
190 "error: remounting filesystem read-only");
7543fc7b
VA		 191 sb->s_flags |= MS_RDONLY;
192 }
193 ext3_commit_super(sb, es, 1);
1da177e4 194 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 195 panic("EXT3-fs (%s): panic forced after error\n",
1da177e4 196 sb->s_id);
1da177e4
LT		 197}
198
199void ext3_error (struct super_block * sb, const char * function,
200 const char * fmt, ...)
201{
202 va_list args;
203
204 va_start(args, fmt);
205 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
206 vprintk(fmt, args);
207 printk("\n");
208 va_end(args);
209
210 ext3_handle_error(sb);
211}
212
213static const char *ext3_decode_error(struct super_block * sb, int errno,
214 char nbuf[16])
215{
216 char *errstr = NULL;
217
218 switch (errno) {
219 case -EIO:
220 errstr = "IO failure";
221 break;
222 case -ENOMEM:
223 errstr = "Out of memory";
224 break;
225 case -EROFS:
226 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
227 errstr = "Journal has aborted";
228 else
229 errstr = "Readonly filesystem";
230 break;
231 default:
232 /* If the caller passed in an extra buffer for unknown
233 * errors, textualise them now. Else we just return
234 * NULL. */
235 if (nbuf) {
236 /* Check for truncated error codes... */
237 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
238 errstr = nbuf;
239 }
240 break;
241 }
242
243 return errstr;
244}
245
246/* __ext3_std_error decodes expected errors from journaling functions
247 * automatically and invokes the appropriate error response. */
248
249void __ext3_std_error (struct super_block * sb, const char * function,
250 int errno)
251{
252 char nbuf[16];
30121624 253 const char *errstr;
1da177e4 254
30121624
ST		 255 /* Special case: if the error is EROFS, and we're not already
256 * inside a transaction, then there's really no point in logging
257 * an error. */
258 if (errno == -EROFS && journal_current_handle() == NULL &&
259 (sb->s_flags & MS_RDONLY))
260 return;
261
262 errstr = ext3_decode_error(sb, errno, nbuf);
4cf46b67 263 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
1da177e4
LT		 264
265 ext3_handle_error(sb);
266}
267
268/*
269 * ext3_abort is a much stronger failure handler than ext3_error. The
270 * abort function may be used to deal with unrecoverable failures such
271 * as journal IO errors or ENOMEM at a critical moment in log management.
272 *
273 * We unconditionally force the filesystem into an ABORT|READONLY state,
274 * unless the error response on the fs has been set to panic in which
275 * case we take the easy way out and panic immediately.
276 */
277
278void ext3_abort (struct super_block * sb, const char * function,
279 const char * fmt, ...)
280{
281 va_list args;
282
1da177e4 283 va_start(args, fmt);
4cf46b67 284 printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
1da177e4
LT		 285 vprintk(fmt, args);
286 printk("\n");
287 va_end(args);
288
289 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 290 panic("EXT3-fs: panic from previous error\n");
1da177e4
LT		 291
292 if (sb->s_flags & MS_RDONLY)
293 return;
294
4cf46b67
AF		 295 ext3_msg(sb, KERN_CRIT,
296 "error: remounting filesystem read-only");
1da177e4
LT		 297 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
298 sb->s_flags |= MS_RDONLY;
e3c96435 299 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
44d6f787
HK		 300 if (EXT3_SB(sb)->s_journal)
301 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 302}
303
304void ext3_warning (struct super_block * sb, const char * function,
305 const char * fmt, ...)
306{
307 va_list args;
308
309 va_start(args, fmt);
4cf46b67 310 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
1da177e4
LT		 311 sb->s_id, function);
312 vprintk(fmt, args);
313 printk("\n");
314 va_end(args);
315}
316
317void ext3_update_dynamic_rev(struct super_block *sb)
318{
319 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
320
321 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
322 return;
323
4cf46b67
AF		 324 ext3_msg(sb, KERN_WARNING,
325 "warning: updating to rev %d because of "
326 "new feature flag, running e2fsck is recommended",
327 EXT3_DYNAMIC_REV);
1da177e4
LT		 328
329 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332 /* leave es->s_feature_*compat flags alone */
333 /* es->s_uuid will be set by e2fsck if empty */
334
335 /*
336 * The rest of the superblock fields should be zero, and if not it
337 * means they are likely already in use, so leave them alone. We
338 * can leave it up to e2fsck to clean up any inconsistencies there.
339 */
340}
341
342/*
343 * Open the external journal device
344 */
4cf46b67 345static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
1da177e4
LT		 346{
347 struct block_device *bdev;
348 char b[BDEVNAME_SIZE];
349
350 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
351 if (IS_ERR(bdev))
352 goto fail;
353 return bdev;
354
355fail:
4cf46b67
AF		 356 ext3_msg(sb, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
358
1da177e4
LT		 359 return NULL;
360}
361
362/*
363 * Release the journal device
364 */
365static int ext3_blkdev_put(struct block_device *bdev)
366{
367 bd_release(bdev);
9a1c3542 368 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 369}
370
371static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
372{
373 struct block_device *bdev;
374 int ret = -ENODEV;
375
376 bdev = sbi->journal_bdev;
377 if (bdev) {
378 ret = ext3_blkdev_put(bdev);
379 sbi->journal_bdev = NULL;
380 }
381 return ret;
382}
383
384static inline struct inode *orphan_list_entry(struct list_head *l)
385{
386 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
387}
388
389static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
390{
391 struct list_head *l;
392
4cf46b67 393 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
1da177e4
LT		 394 le32_to_cpu(sbi->s_es->s_last_orphan));
395
4cf46b67 396 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
1da177e4
LT		 397 list_for_each(l, &sbi->s_orphan) {
398 struct inode *inode = orphan_list_entry(l);
4cf46b67 399 ext3_msg(sb, KERN_ERR, " "
eee194e7 400 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 401 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 402 inode->i_mode, inode->i_nlink,
1da177e4
LT		 403 NEXT_ORPHAN(inode));
404 }
405}
406
407static void ext3_put_super (struct super_block * sb)
408{
409 struct ext3_sb_info *sbi = EXT3_SB(sb);
410 struct ext3_super_block *es = sbi->s_es;
44d6f787 411 int i, err;
1da177e4 412
e0ccfd95
CH		 413 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
414
6cfd0148
CH		 415 lock_kernel();
416
1da177e4 417 ext3_xattr_put_super(sb);
44d6f787
HK		 418 err = journal_destroy(sbi->s_journal);
419 sbi->s_journal = NULL;
420 if (err < 0)
2d7c820e 421 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 422
1da177e4
LT		 423 if (!(sb->s_flags & MS_RDONLY)) {
424 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
425 es->s_state = cpu_to_le16(sbi->s_mount_state);
426 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
427 mark_buffer_dirty(sbi->s_sbh);
428 ext3_commit_super(sb, es, 1);
429 }
430
431 for (i = 0; i < sbi->s_gdb_count; i++)
432 brelse(sbi->s_group_desc[i]);
433 kfree(sbi->s_group_desc);
434 percpu_counter_destroy(&sbi->s_freeblocks_counter);
435 percpu_counter_destroy(&sbi->s_freeinodes_counter);
436 percpu_counter_destroy(&sbi->s_dirs_counter);
437 brelse(sbi->s_sbh);
438#ifdef CONFIG_QUOTA
439 for (i = 0; i < MAXQUOTAS; i++)
440 kfree(sbi->s_qf_names[i]);
441#endif
442
443 /* Debugging code just in case the in-memory inode orphan list
444 * isn't empty. The on-disk one can be non-empty if we've
445 * detected an error and taken the fs readonly, but the
446 * in-memory list had better be clean by this point. */
447 if (!list_empty(&sbi->s_orphan))
448 dump_orphan_list(sb, sbi);
449 J_ASSERT(list_empty(&sbi->s_orphan));
450
f98393a6 451 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 452 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
453 /*
454 * Invalidate the journal device's buffers. We don't want them
455 * floating about in memory - the physical journal device may
456 * hotswapped, and it breaks the `ro-after' testing code.
457 */
458 sync_blockdev(sbi->journal_bdev);
f98393a6 459 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 460 ext3_blkdev_remove(sbi);
461 }
462 sb->s_fs_info = NULL;
5df096d6 463 kfree(sbi->s_blockgroup_lock);
1da177e4 464 kfree(sbi);
6cfd0148
CH		 465
466 unlock_kernel();
1da177e4
LT		 467}
468
e18b890b 469static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 470
471/*
472 * Called inside transaction, so use GFP_NOFS
473 */
474static struct inode *ext3_alloc_inode(struct super_block *sb)
475{
476 struct ext3_inode_info *ei;
477
e6b4f8da 478 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 479 if (!ei)
480 return NULL;
1da177e4
LT		 481 ei->i_block_alloc_info = NULL;
482 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 483 atomic_set(&ei->i_datasync_tid, 0);
484 atomic_set(&ei->i_sync_tid, 0);
1da177e4
LT		 485 return &ei->vfs_inode;
486}
487
488static void ext3_destroy_inode(struct inode *inode)
489{
9f7dd93d
VA		 490 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
491 printk("EXT3 Inode %p: orphan list check failed!\n",
492 EXT3_I(inode));
493 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
494 EXT3_I(inode), sizeof(struct ext3_inode_info),
495 false);
496 dump_stack();
497 }
1da177e4
LT		 498 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
499}
500
51cc5068 501static void init_once(void *foo)
1da177e4
LT		 502{
503 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
504
a35afb83 505 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 506#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 507 init_rwsem(&ei->xattr_sem);
1da177e4 508#endif
a35afb83
CL		 509 mutex_init(&ei->truncate_mutex);
510 inode_init_once(&ei->vfs_inode);
1da177e4 511}
ae6ddcc5 512
1da177e4
LT		 513static int init_inodecache(void)
514{
515 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
516 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 517 0, (SLAB_RECLAIM_ACCOUNT|
518 SLAB_MEM_SPREAD),
20c2df83 519 init_once);
1da177e4
LT		 520 if (ext3_inode_cachep == NULL)
521 return -ENOMEM;
522 return 0;
523}
524
525static void destroy_inodecache(void)
526{
1a1d92c1 527 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 528}
529
530static void ext3_clear_inode(struct inode *inode)
531{
532 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
257ba15c 533
9f754758 534 dquot_drop(inode);
1da177e4
LT		 535 ext3_discard_reservation(inode);
536 EXT3_I(inode)->i_block_alloc_info = NULL;
e6022603
AM		 537 if (unlikely(rsv))
538 kfree(rsv);
1da177e4
LT		 539}
540
6cd37cda 541static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 542{
6cd37cda 543#if defined(CONFIG_QUOTA)
275abf5b 544 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 545
1aeec434
JK		 546 if (sbi->s_jquota_fmt) {
547 char *fmtname = "";
548
549 switch (sbi->s_jquota_fmt) {
550 case QFMT_VFS_OLD:
551 fmtname = "vfsold";
552 break;
553 case QFMT_VFS_V0:
554 fmtname = "vfsv0";
555 break;
556 case QFMT_VFS_V1:
557 fmtname = "vfsv1";
558 break;
559 }
560 seq_printf(seq, ",jqfmt=%s", fmtname);
561 }
8fc2751b
MB		 562
563 if (sbi->s_qf_names[USRQUOTA])
564 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
565
566 if (sbi->s_qf_names[GRPQUOTA])
567 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
568
e3c96435 569 if (test_opt(sb, USRQUOTA))
8fc2751b
MB		 570 seq_puts(seq, ",usrquota");
571
e3c96435 572 if (test_opt(sb, GRPQUOTA))
8fc2751b
MB		 573 seq_puts(seq, ",grpquota");
574#endif
6cd37cda
PO		 575}
576
3c4cec65
JK		 577static char *data_mode_string(unsigned long mode)
578{
579 switch (mode) {
580 case EXT3_MOUNT_JOURNAL_DATA:
581 return "journal";
582 case EXT3_MOUNT_ORDERED_DATA:
583 return "ordered";
584 case EXT3_MOUNT_WRITEBACK_DATA:
585 return "writeback";
586 }
587 return "unknown";
588}
589
571beed8
MS		 590/*
591 * Show an option if
592 * - it's set to a non-default value OR
593 * - if the per-sb default is different from the global default
594 */
6cd37cda
PO		 595static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
596{
597 struct super_block *sb = vfs->mnt_sb;
571beed8
MS		 598 struct ext3_sb_info *sbi = EXT3_SB(sb);
599 struct ext3_super_block *es = sbi->s_es;
600 unsigned long def_mount_opts;
601
602 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
603
604 if (sbi->s_sb_block != 1)
605 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
606 if (test_opt(sb, MINIX_DF))
607 seq_puts(seq, ",minixdf");
608 if (test_opt(sb, GRPID))
609 seq_puts(seq, ",grpid");
610 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
611 seq_puts(seq, ",nogrpid");
612 if (sbi->s_resuid != EXT3_DEF_RESUID ||
613 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
614 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
615 }
616 if (sbi->s_resgid != EXT3_DEF_RESGID ||
617 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
618 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
619 }
1eca93f9 620 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 621 int def_errors = le16_to_cpu(es->s_errors);
622
623 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 624 def_errors == EXT3_ERRORS_CONTINUE) {
625 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 626 }
627 }
1eca93f9
AK		 628 if (test_opt(sb, ERRORS_CONT))
629 seq_puts(seq, ",errors=continue");
571beed8
MS		 630 if (test_opt(sb, ERRORS_PANIC))
631 seq_puts(seq, ",errors=panic");
632 if (test_opt(sb, NO_UID32))
633 seq_puts(seq, ",nouid32");
634 if (test_opt(sb, DEBUG))
635 seq_puts(seq, ",debug");
636 if (test_opt(sb, OLDALLOC))
637 seq_puts(seq, ",oldalloc");
638#ifdef CONFIG_EXT3_FS_XATTR
639 if (test_opt(sb, XATTR_USER))
640 seq_puts(seq, ",user_xattr");
641 if (!test_opt(sb, XATTR_USER) &&
642 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
643 seq_puts(seq, ",nouser_xattr");
644 }
645#endif
646#ifdef CONFIG_EXT3_FS_POSIX_ACL
647 if (test_opt(sb, POSIX_ACL))
648 seq_puts(seq, ",acl");
649 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
650 seq_puts(seq, ",noacl");
651#endif
652 if (!test_opt(sb, RESERVATION))
653 seq_puts(seq, ",noreservation");
654 if (sbi->s_commit_interval) {
655 seq_printf(seq, ",commit=%u",
656 (unsigned) (sbi->s_commit_interval / HZ));
657 }
0636c73e
ES		 658
659 /*
660 * Always display barrier state so it's clear what the status is.
661 */
662 seq_puts(seq, ",barrier=");
663 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
571beed8
MS		 664 if (test_opt(sb, NOBH))
665 seq_puts(seq, ",nobh");
6cd37cda 666
e3c96435 667 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
0e4fb5e2
HK		 668 if (test_opt(sb, DATA_ERR_ABORT))
669 seq_puts(seq, ",data_err=abort");
670
dee1d3b6
ES		 671 if (test_opt(sb, NOLOAD))
672 seq_puts(seq, ",norecovery");
673
6cd37cda 674 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 675
676 return 0;
677}
1da177e4 678
fdb36673 679
74af0baa
CH		 680static struct inode *ext3_nfs_get_inode(struct super_block *sb,
681 u64 ino, u32 generation)
fdb36673 682{
fdb36673 683 struct inode *inode;
fdb36673
N		 684
685 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
686 return ERR_PTR(-ESTALE);
687 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
688 return ERR_PTR(-ESTALE);
689
690 /* iget isn't really right if the inode is currently unallocated!!
691 *
692 * ext3_read_inode will return a bad_inode if the inode had been
693 * deleted, so we should be safe.
694 *
695 * Currently we don't know the generation for parent directory, so
696 * a generation of 0 means "accept any"
697 */
473043dc
DH		 698 inode = ext3_iget(sb, ino);
699 if (IS_ERR(inode))
700 return ERR_CAST(inode);
701 if (generation && inode->i_generation != generation) {
fdb36673
N		 702 iput(inode);
703 return ERR_PTR(-ESTALE);
704 }
74af0baa
CH		 705
706 return inode;
707}
708
709static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
710 int fh_len, int fh_type)
711{
712 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
713 ext3_nfs_get_inode);
714}
715
716static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
717 int fh_len, int fh_type)
718{
719 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
720 ext3_nfs_get_inode);
fdb36673
N		 721}
722
6b082b53
TO		 723/*
724 * Try to release metadata pages (indirect blocks, directories) which are
725 * mapped via the block device. Since these pages could have journal heads
726 * which would prevent try_to_free_buffers() from freeing them, we must use
727 * jbd layer's try_to_free_buffers() function to release them.
728 */
729static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
730 gfp_t wait)
731{
732 journal_t *journal = EXT3_SB(sb)->s_journal;
733
734 WARN_ON(PageChecked(page));
735 if (!page_has_buffers(page))
736 return 0;
737 if (journal)
738 return journal_try_to_free_buffers(journal, page,
739 wait & ~__GFP_WAIT);
740 return try_to_free_buffers(page);
741}
742
8fc2751b 743#ifdef CONFIG_QUOTA
1da177e4
LT		 744#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
745#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
746
1da177e4
LT		 747static int ext3_write_dquot(struct dquot *dquot);
748static int ext3_acquire_dquot(struct dquot *dquot);
749static int ext3_release_dquot(struct dquot *dquot);
750static int ext3_mark_dquot_dirty(struct dquot *dquot);
751static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f 752static int ext3_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 753 char *path);
1da177e4
LT		 754static int ext3_quota_on_mount(struct super_block *sb, int type);
755static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
756 size_t len, loff_t off);
757static ssize_t ext3_quota_write(struct super_block *sb, int type,
758 const char *data, size_t len, loff_t off);
759
61e225dc 760static const struct dquot_operations ext3_quota_operations = {
1da177e4
LT		 761 .write_dquot = ext3_write_dquot,
762 .acquire_dquot = ext3_acquire_dquot,
763 .release_dquot = ext3_release_dquot,
764 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 765 .write_info = ext3_write_info,
766 .alloc_dquot = dquot_alloc,
767 .destroy_dquot = dquot_destroy,
1da177e4
LT		 768};
769
0d54b217 770static const struct quotactl_ops ext3_qctl_operations = {
1da177e4 771 .quota_on = ext3_quota_on,
287a8095
CH		 772 .quota_off = dquot_quota_off,
773 .quota_sync = dquot_quota_sync,
774 .get_info = dquot_get_dqinfo,
775 .set_info = dquot_set_dqinfo,
776 .get_dqblk = dquot_get_dqblk,
777 .set_dqblk = dquot_set_dqblk
1da177e4
LT		 778};
779#endif
780
ee9b6d61 781static const struct super_operations ext3_sops = {
1da177e4
LT		 782 .alloc_inode = ext3_alloc_inode,
783 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 784 .write_inode = ext3_write_inode,
785 .dirty_inode = ext3_dirty_inode,
786 .delete_inode = ext3_delete_inode,
787 .put_super = ext3_put_super,
1da177e4 788 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 789 .freeze_fs = ext3_freeze,
790 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 791 .statfs = ext3_statfs,
792 .remount_fs = ext3_remount,
793 .clear_inode = ext3_clear_inode,
8fc2751b 794 .show_options = ext3_show_options,
1da177e4
LT		 795#ifdef CONFIG_QUOTA
796 .quota_read = ext3_quota_read,
797 .quota_write = ext3_quota_write,
798#endif
6b082b53 799 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 800};
801
39655164 802static const struct export_operations ext3_export_ops = {
74af0baa
CH		 803 .fh_to_dentry = ext3_fh_to_dentry,
804 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 805 .get_parent = ext3_get_parent,
806};
807
808enum {
809 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
810 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 811 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 812 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 813 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 814 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 815 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 816 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 817 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1aeec434 818 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
0636c73e
ES		 819 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
820 Opt_resize, Opt_usrquota, Opt_grpquota
1da177e4
LT		 821};
822
a447c093 823static const match_table_t tokens = {
1da177e4
LT		 824 {Opt_bsd_df, "bsddf"},
825 {Opt_minix_df, "minixdf"},
826 {Opt_grpid, "grpid"},
827 {Opt_grpid, "bsdgroups"},
828 {Opt_nogrpid, "nogrpid"},
829 {Opt_nogrpid, "sysvgroups"},
830 {Opt_resgid, "resgid=%u"},
831 {Opt_resuid, "resuid=%u"},
832 {Opt_sb, "sb=%u"},
833 {Opt_err_cont, "errors=continue"},
834 {Opt_err_panic, "errors=panic"},
835 {Opt_err_ro, "errors=remount-ro"},
836 {Opt_nouid32, "nouid32"},
837 {Opt_nocheck, "nocheck"},
838 {Opt_nocheck, "check=none"},
1da177e4
LT		 839 {Opt_debug, "debug"},
840 {Opt_oldalloc, "oldalloc"},
841 {Opt_orlov, "orlov"},
842 {Opt_user_xattr, "user_xattr"},
843 {Opt_nouser_xattr, "nouser_xattr"},
844 {Opt_acl, "acl"},
845 {Opt_noacl, "noacl"},
846 {Opt_reservation, "reservation"},
847 {Opt_noreservation, "noreservation"},
848 {Opt_noload, "noload"},
dee1d3b6 849 {Opt_noload, "norecovery"},
1da177e4 850 {Opt_nobh, "nobh"},
ade1a29e 851 {Opt_bh, "bh"},
1da177e4
LT		 852 {Opt_commit, "commit=%u"},
853 {Opt_journal_update, "journal=update"},
854 {Opt_journal_inum, "journal=%u"},
71b96257 855 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 856 {Opt_abort, "abort"},
857 {Opt_data_journal, "data=journal"},
858 {Opt_data_ordered, "data=ordered"},
859 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 860 {Opt_data_err_abort, "data_err=abort"},
861 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 862 {Opt_offusrjquota, "usrjquota="},
863 {Opt_usrjquota, "usrjquota=%s"},
864 {Opt_offgrpjquota, "grpjquota="},
865 {Opt_grpjquota, "grpjquota=%s"},
866 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
867 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1aeec434 868 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
8fc2751b 869 {Opt_grpquota, "grpquota"},
1f54587b
JK		 870 {Opt_noquota, "noquota"},
871 {Opt_quota, "quota"},
8fc2751b 872 {Opt_usrquota, "usrquota"},
1da177e4 873 {Opt_barrier, "barrier=%u"},
0636c73e
ES		 874 {Opt_barrier, "barrier"},
875 {Opt_nobarrier, "nobarrier"},
1da177e4 876 {Opt_resize, "resize"},
92587216 877 {Opt_err, NULL},
1da177e4
LT		 878};
879
4cf46b67 880static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 881{
e9ad5620
DK		 882 ext3_fsblk_t sb_block;
883 char *options = (char *) *data;
1da177e4
LT		 884
885 if (!options || strncmp(options, "sb=", 3) != 0)
886 return 1; /* Default location */
887 options += 3;
43d23f90 888 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 889 sb_block = simple_strtoul(options, &options, 0);
890 if (*options && *options != ',') {
4cf46b67 891 ext3_msg(sb, "error: invalid sb specification: %s",
1da177e4
LT		 892 (char *) *data);
893 return 1;
894 }
895 if (*options == ',')
896 options++;
897 *data = (void *) options;
898 return sb_block;
899}
900
e1f5c67a
DM		 901#ifdef CONFIG_QUOTA
902static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
903{
904 struct ext3_sb_info *sbi = EXT3_SB(sb);
905 char *qname;
906
907 if (sb_any_quota_loaded(sb) &&
908 !sbi->s_qf_names[qtype]) {
909 ext3_msg(sb, KERN_ERR,
910 "Cannot change journaled "
911 "quota options when quota turned on");
912 return 0;
913 }
914 qname = match_strdup(args);
915 if (!qname) {
916 ext3_msg(sb, KERN_ERR,
917 "Not enough memory for storing quotafile name");
918 return 0;
919 }
920 if (sbi->s_qf_names[qtype] &&
921 strcmp(sbi->s_qf_names[qtype], qname)) {
922 ext3_msg(sb, KERN_ERR,
923 "%s quota file already specified", QTYPE2NAME(qtype));
924 kfree(qname);
925 return 0;
926 }
927 sbi->s_qf_names[qtype] = qname;
928 if (strchr(sbi->s_qf_names[qtype], '/')) {
929 ext3_msg(sb, KERN_ERR,
930 "quotafile must be on filesystem root");
931 kfree(sbi->s_qf_names[qtype]);
932 sbi->s_qf_names[qtype] = NULL;
933 return 0;
934 }
935 set_opt(sbi->s_mount_opt, QUOTA);
936 return 1;
937}
938
939static int clear_qf_name(struct super_block *sb, int qtype) {
940
941 struct ext3_sb_info *sbi = EXT3_SB(sb);
942
943 if (sb_any_quota_loaded(sb) &&
944 sbi->s_qf_names[qtype]) {
945 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
946 " when quota turned on");
947 return 0;
948 }
949 /*
950 * The space will be released later when all options are confirmed
951 * to be correct
952 */
953 sbi->s_qf_names[qtype] = NULL;
954 return 1;
955}
956#endif
957
71b96257 958static int parse_options (char *options, struct super_block *sb,
eee194e7 959 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 960 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 961{
962 struct ext3_sb_info *sbi = EXT3_SB(sb);
963 char * p;
964 substring_t args[MAX_OPT_ARGS];
965 int data_opt = 0;
966 int option;
967#ifdef CONFIG_QUOTA
e1f5c67a 968 int qfmt;
1da177e4
LT		 969#endif
970
971 if (!options)
972 return 1;
973
974 while ((p = strsep (&options, ",")) != NULL) {
975 int token;
976 if (!*p)
977 continue;
0636c73e
ES		 978 /*
979 * Initialize args struct so we know whether arg was
980 * found; some options take optional arguments.
981 */
982 args[0].to = args[0].from = 0;
1da177e4
LT		 983 token = match_token(p, tokens, args);
984 switch (token) {
985 case Opt_bsd_df:
986 clear_opt (sbi->s_mount_opt, MINIX_DF);
987 break;
988 case Opt_minix_df:
989 set_opt (sbi->s_mount_opt, MINIX_DF);
990 break;
991 case Opt_grpid:
992 set_opt (sbi->s_mount_opt, GRPID);
993 break;
994 case Opt_nogrpid:
995 clear_opt (sbi->s_mount_opt, GRPID);
996 break;
997 case Opt_resuid:
998 if (match_int(&args[0], &option))
999 return 0;
1000 sbi->s_resuid = option;
1001 break;
1002 case Opt_resgid:
1003 if (match_int(&args[0], &option))
1004 return 0;
1005 sbi->s_resgid = option;
1006 break;
1007 case Opt_sb:
1008 /* handled by get_sb_block() instead of here */
1009 /* *sb_block = match_int(&args[0]); */
1010 break;
1011 case Opt_err_panic:
1012 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1013 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1014 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1015 break;
1016 case Opt_err_ro:
1017 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1018 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1019 set_opt (sbi->s_mount_opt, ERRORS_RO);
1020 break;
1021 case Opt_err_cont:
1022 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1023 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1024 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1025 break;
1026 case Opt_nouid32:
1027 set_opt (sbi->s_mount_opt, NO_UID32);
1028 break;
1da177e4
LT		 1029 case Opt_nocheck:
1030 clear_opt (sbi->s_mount_opt, CHECK);
1031 break;
1032 case Opt_debug:
1033 set_opt (sbi->s_mount_opt, DEBUG);
1034 break;
1035 case Opt_oldalloc:
1036 set_opt (sbi->s_mount_opt, OLDALLOC);
1037 break;
1038 case Opt_orlov:
1039 clear_opt (sbi->s_mount_opt, OLDALLOC);
1040 break;
1041#ifdef CONFIG_EXT3_FS_XATTR
1042 case Opt_user_xattr:
1043 set_opt (sbi->s_mount_opt, XATTR_USER);
1044 break;
1045 case Opt_nouser_xattr:
1046 clear_opt (sbi->s_mount_opt, XATTR_USER);
1047 break;
1048#else
1049 case Opt_user_xattr:
1050 case Opt_nouser_xattr:
4cf46b67
AF		 1051 ext3_msg(sb, KERN_INFO,
1052 "(no)user_xattr options not supported");
1da177e4
LT		 1053 break;
1054#endif
1055#ifdef CONFIG_EXT3_FS_POSIX_ACL
1056 case Opt_acl:
1057 set_opt(sbi->s_mount_opt, POSIX_ACL);
1058 break;
1059 case Opt_noacl:
1060 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1061 break;
1062#else
1063 case Opt_acl:
1064 case Opt_noacl:
4cf46b67
AF		 1065 ext3_msg(sb, KERN_INFO,
1066 "(no)acl options not supported");
1da177e4
LT		 1067 break;
1068#endif
1069 case Opt_reservation:
1070 set_opt(sbi->s_mount_opt, RESERVATION);
1071 break;
1072 case Opt_noreservation:
1073 clear_opt(sbi->s_mount_opt, RESERVATION);
1074 break;
1075 case Opt_journal_update:
1076 /* @@@ FIXME */
1077 /* Eventually we will want to be able to create
1078 a journal file here. For now, only allow the
1079 user to specify an existing inode to be the
1080 journal file. */
1081 if (is_remount) {
4cf46b67
AF		 1082 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1083 "journal on remount");
1da177e4
LT		 1084 return 0;
1085 }
1086 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1087 break;
1088 case Opt_journal_inum:
1089 if (is_remount) {
4cf46b67
AF		 1090 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1091 "journal on remount");
1da177e4
LT		 1092 return 0;
1093 }
1094 if (match_int(&args[0], &option))
1095 return 0;
1096 *inum = option;
1097 break;
71b96257
JL		 1098 case Opt_journal_dev:
1099 if (is_remount) {
4cf46b67
AF		 1100 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1101 "journal on remount");
71b96257
JL		 1102 return 0;
1103 }
1104 if (match_int(&args[0], &option))
1105 return 0;
1106 *journal_devnum = option;
1107 break;
1da177e4
LT		 1108 case Opt_noload:
1109 set_opt (sbi->s_mount_opt, NOLOAD);
1110 break;
1111 case Opt_commit:
1112 if (match_int(&args[0], &option))
1113 return 0;
1114 if (option < 0)
1115 return 0;
1116 if (option == 0)
1117 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1118 sbi->s_commit_interval = HZ * option;
1119 break;
1120 case Opt_data_journal:
1121 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1122 goto datacheck;
1123 case Opt_data_ordered:
1124 data_opt = EXT3_MOUNT_ORDERED_DATA;
1125 goto datacheck;
1126 case Opt_data_writeback:
1127 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1128 datacheck:
1129 if (is_remount) {
e3c96435 1130 if (test_opt(sb, DATA_FLAGS) == data_opt)
3c4cec65 1131 break;
4cf46b67
AF		 1132 ext3_msg(sb, KERN_ERR,
1133 "error: cannot change "
3c4cec65
JK		 1134 "data mode on remount. The filesystem "
1135 "is mounted in data=%s mode and you "
4cf46b67 1136 "try to remount it in data=%s mode.",
e3c96435
DM		 1137 data_mode_string(test_opt(sb,
1138 DATA_FLAGS)),
3c4cec65
JK		 1139 data_mode_string(data_opt));
1140 return 0;
1da177e4 1141 } else {
e3c96435 1142 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1da177e4
LT		 1143 sbi->s_mount_opt |= data_opt;
1144 }
1145 break;
0e4fb5e2
HK		 1146 case Opt_data_err_abort:
1147 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1148 break;
1149 case Opt_data_err_ignore:
1150 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1151 break;
1da177e4
LT		 1152#ifdef CONFIG_QUOTA
1153 case Opt_usrjquota:
e1f5c67a 1154 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1da177e4 1155 return 0;
e1f5c67a
DM		 1156 break;
1157 case Opt_grpjquota:
1158 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1da177e4 1159 return 0;
1da177e4
LT		 1160 break;
1161 case Opt_offusrjquota:
e1f5c67a
DM		 1162 if (!clear_qf_name(sb, USRQUOTA))
1163 return 0;
1164 break;
1da177e4 1165 case Opt_offgrpjquota:
e1f5c67a 1166 if (!clear_qf_name(sb, GRPQUOTA))
1da177e4 1167 return 0;
1da177e4
LT		 1168 break;
1169 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1170 qfmt = QFMT_VFS_OLD;
1171 goto set_qf_format;
1da177e4 1172 case Opt_jqfmt_vfsv0:
d06bf1d2 1173 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1174 goto set_qf_format;
1175 case Opt_jqfmt_vfsv1:
1176 qfmt = QFMT_VFS_V1;
d06bf1d2 1177set_qf_format:
ee0d5ffe 1178 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1179 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1180 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1181 "journaled quota options when "
4cf46b67 1182 "quota turned on.");
d06bf1d2
JK		 1183 return 0;
1184 }
1185 sbi->s_jquota_fmt = qfmt;
1da177e4 1186 break;
1f54587b 1187 case Opt_quota:
8fc2751b
MB		 1188 case Opt_usrquota:
1189 set_opt(sbi->s_mount_opt, QUOTA);
1190 set_opt(sbi->s_mount_opt, USRQUOTA);
1191 break;
1192 case Opt_grpquota:
1f54587b 1193 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1194 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1195 break;
1196 case Opt_noquota:
ee0d5ffe 1197 if (sb_any_quota_loaded(sb)) {
4cf46b67
AF		 1198 ext3_msg(sb, KERN_ERR, "error: cannot change "
1199 "quota options when quota turned on.");
1f54587b
JK		 1200 return 0;
1201 }
1202 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1203 clear_opt(sbi->s_mount_opt, USRQUOTA);
1204 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1205 break;
1da177e4 1206#else
8fc2751b
MB		 1207 case Opt_quota:
1208 case Opt_usrquota:
1209 case Opt_grpquota:
4cf46b67
AF		 1210 ext3_msg(sb, KERN_ERR,
1211 "error: quota options not supported.");
fa1ff1e0 1212 break;
1da177e4
LT		 1213 case Opt_usrjquota:
1214 case Opt_grpjquota:
1215 case Opt_offusrjquota:
1216 case Opt_offgrpjquota:
1217 case Opt_jqfmt_vfsold:
1218 case Opt_jqfmt_vfsv0:
1aeec434 1219 case Opt_jqfmt_vfsv1:
4cf46b67
AF		 1220 ext3_msg(sb, KERN_ERR,
1221 "error: journaled quota options not "
1222 "supported.");
1da177e4 1223 break;
1f54587b
JK		 1224 case Opt_noquota:
1225 break;
1da177e4
LT		 1226#endif
1227 case Opt_abort:
1228 set_opt(sbi->s_mount_opt, ABORT);
1229 break;
0636c73e
ES		 1230 case Opt_nobarrier:
1231 clear_opt(sbi->s_mount_opt, BARRIER);
1232 break;
1da177e4 1233 case Opt_barrier:
0636c73e
ES		 1234 if (args[0].from) {
1235 if (match_int(&args[0], &option))
1236 return 0;
1237 } else
1238 option = 1; /* No argument, default to 1 */
1da177e4
LT		 1239 if (option)
1240 set_opt(sbi->s_mount_opt, BARRIER);
1241 else
1242 clear_opt(sbi->s_mount_opt, BARRIER);
1243 break;
1244 case Opt_ignore:
1245 break;
1246 case Opt_resize:
08c6a96f 1247 if (!is_remount) {
4cf46b67
AF		 1248 ext3_msg(sb, KERN_ERR,
1249 "error: resize option only available "
1250 "for remount");
1da177e4
LT		 1251 return 0;
1252 }
c7f1721e
KZ		 1253 if (match_int(&args[0], &option) != 0)
1254 return 0;
1da177e4
LT		 1255 *n_blocks_count = option;
1256 break;
1257 case Opt_nobh:
1258 set_opt(sbi->s_mount_opt, NOBH);
1259 break;
ade1a29e
BP		 1260 case Opt_bh:
1261 clear_opt(sbi->s_mount_opt, NOBH);
1262 break;
1da177e4 1263 default:
4cf46b67
AF		 1264 ext3_msg(sb, KERN_ERR,
1265 "error: unrecognized mount option \"%s\" "
1266 "or missing value", p);
1da177e4
LT		 1267 return 0;
1268 }
1269 }
1270#ifdef CONFIG_QUOTA
8fc2751b 1271 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
e3c96435 1272 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
8fc2751b 1273 clear_opt(sbi->s_mount_opt, USRQUOTA);
e3c96435 1274 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
8fc2751b
MB		 1275 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1276
e1f5c67a 1277 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
4cf46b67
AF		 1278 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1279 "format mixing.");
8fc2751b
MB		 1280 return 0;
1281 }
1282
1283 if (!sbi->s_jquota_fmt) {
4cf46b67
AF		 1284 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1285 "not specified.");
8fc2751b
MB		 1286 return 0;
1287 }
1288 } else {
1289 if (sbi->s_jquota_fmt) {
4cf46b67 1290 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
99aeaf63 1291 "specified with no journaling "
4cf46b67 1292 "enabled.");
8fc2751b
MB		 1293 return 0;
1294 }
1da177e4
LT		 1295 }
1296#endif
1da177e4
LT		 1297 return 1;
1298}
1299
1300static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1301 int read_only)
1302{
1303 struct ext3_sb_info *sbi = EXT3_SB(sb);
1304 int res = 0;
1305
1306 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
AF		 1307 ext3_msg(sb, KERN_ERR,
1308 "error: revision level too high, "
1309 "forcing read-only mode");
1da177e4
LT		 1310 res = MS_RDONLY;
1311 }
1312 if (read_only)
1313 return res;
1314 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
AF		 1315 ext3_msg(sb, KERN_WARNING,
1316 "warning: mounting unchecked fs, "
1317 "running e2fsck is recommended");
1da177e4 1318 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
AF		 1319 ext3_msg(sb, KERN_WARNING,
1320 "warning: mounting fs with errors, "
1321 "running e2fsck is recommended");
1da177e4
LT		 1322 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1323 le16_to_cpu(es->s_mnt_count) >=
1324 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
4cf46b67
AF		 1325 ext3_msg(sb, KERN_WARNING,
1326 "warning: maximal mount count reached, "
1327 "running e2fsck is recommended");
1da177e4
LT		 1328 else if (le32_to_cpu(es->s_checkinterval) &&
1329 (le32_to_cpu(es->s_lastcheck) +
1330 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
AF		 1331 ext3_msg(sb, KERN_WARNING,
1332 "warning: checktime reached, "
1333 "running e2fsck is recommended");
1da177e4
LT		 1334#if 0
1335 /* @@@ We _will_ want to clear the valid bit if we find
1336 inconsistencies, to force a fsck at reboot. But for
1337 a plain journaled filesystem we can keep it set as
1338 valid forever! :) */
e7f23ebd 1339 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4
LT		 1340#endif
1341 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1342 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1343 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1344 es->s_mtime = cpu_to_le32(get_seconds());
1345 ext3_update_dynamic_rev(sb);
1346 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1347
1348 ext3_commit_super(sb, es, 1);
1349 if (test_opt(sb, DEBUG))
4cf46b67
AF		 1350 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1351 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1352 sb->s_blocksize,
1353 sbi->s_groups_count,
1354 EXT3_BLOCKS_PER_GROUP(sb),
1355 EXT3_INODES_PER_GROUP(sb),
1356 sbi->s_mount_opt);
1357
1da177e4
LT		 1358 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1359 char b[BDEVNAME_SIZE];
4cf46b67 1360 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1361 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1362 } else {
4cf46b67 1363 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1364 }
1da177e4
LT		 1365 return res;
1366}
1367
1368/* Called at mount-time, super-block is locked */
197cd65a 1369static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1370{
1371 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1372 int i;
1373
1374 ext3_debug ("Checking group descriptors");
1375
197cd65a
AM		 1376 for (i = 0; i < sbi->s_groups_count; i++) {
1377 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1378 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1379 ext3_fsblk_t last_block;
197cd65a 1380
855565e8
ES		 1381 if (i == sbi->s_groups_count - 1)
1382 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1383 else
1384 last_block = first_block +
1385 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1386
855565e8
ES		 1387 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1388 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1389 {
1390 ext3_error (sb, "ext3_check_descriptors",
1391 "Block bitmap for group %d"
1392 " not in group (block %lu)!",
1393 i, (unsigned long)
1394 le32_to_cpu(gdp->bg_block_bitmap));
1395 return 0;
1396 }
855565e8
ES		 1397 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1398 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1399 {
1400 ext3_error (sb, "ext3_check_descriptors",
1401 "Inode bitmap for group %d"
1402 " not in group (block %lu)!",
1403 i, (unsigned long)
1404 le32_to_cpu(gdp->bg_inode_bitmap));
1405 return 0;
1406 }
855565e8 1407 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1408 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1409 last_block)
1da177e4
LT		 1410 {
1411 ext3_error (sb, "ext3_check_descriptors",
1412 "Inode table for group %d"
1413 " not in group (block %lu)!",
1414 i, (unsigned long)
1415 le32_to_cpu(gdp->bg_inode_table));
1416 return 0;
1417 }
1da177e4
LT		 1418 }
1419
1420 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1421 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1422 return 1;
1423}
1424
1425
1426/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1427 * the superblock) which were deleted from all directories, but held open by
1428 * a process at the time of a crash. We walk the list and try to delete these
1429 * inodes at recovery time (only with a read-write filesystem).
1430 *
1431 * In order to keep the orphan inode chain consistent during traversal (in
1432 * case of crash during recovery), we link each inode into the superblock
1433 * orphan list_head and handle it the same way as an inode deletion during
1434 * normal operation (which journals the operations for us).
1435 *
1436 * We only do an iget() and an iput() on each inode, which is very safe if we
1437 * accidentally point at an in-use or already deleted inode. The worst that
1438 * can happen in this case is that we get a "bit already cleared" message from
1439 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1440 * e2fsck was run on this filesystem, and it must have already done the orphan
1441 * inode cleanup for us, so we can safely abort without any further action.
1442 */
1443static void ext3_orphan_cleanup (struct super_block * sb,
1444 struct ext3_super_block * es)
1445{
1446 unsigned int s_flags = sb->s_flags;
1447 int nr_orphans = 0, nr_truncates = 0;
1448#ifdef CONFIG_QUOTA
1449 int i;
1450#endif
1451 if (!es->s_last_orphan) {
1452 jbd_debug(4, "no orphan inodes to clean up\n");
1453 return;
1454 }
1455
a8f48a95 1456 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
AF		 1457 ext3_msg(sb, KERN_ERR, "error: write access "
1458 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1459 return;
1460 }
1461
1da177e4
LT		 1462 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1463 if (es->s_last_orphan)
1464 jbd_debug(1, "Errors on filesystem, "
1465 "clearing orphan list.\n");
1466 es->s_last_orphan = 0;
1467 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1468 return;
1469 }
1470
1471 if (s_flags & MS_RDONLY) {
4cf46b67 1472 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1473 sb->s_flags &= ~MS_RDONLY;
1474 }
1475#ifdef CONFIG_QUOTA
1476 /* Needed for iput() to work correctly and not trash data */
1477 sb->s_flags |= MS_ACTIVE;
1478 /* Turn on quotas so that they are updated correctly */
1479 for (i = 0; i < MAXQUOTAS; i++) {
1480 if (EXT3_SB(sb)->s_qf_names[i]) {
1481 int ret = ext3_quota_on_mount(sb, i);
1482 if (ret < 0)
4cf46b67
AF		 1483 ext3_msg(sb, KERN_ERR,
1484 "error: cannot turn on journaled "
1485 "quota: %d", ret);
1da177e4
LT		 1486 }
1487 }
1488#endif
1489
1490 while (es->s_last_orphan) {
1491 struct inode *inode;
1492
473043dc
DH		 1493 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1494 if (IS_ERR(inode)) {
1da177e4
LT		 1495 es->s_last_orphan = 0;
1496 break;
1497 }
1498
1499 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
871a2931 1500 dquot_initialize(inode);
1da177e4
LT		 1501 if (inode->i_nlink) {
1502 printk(KERN_DEBUG
eee194e7 1503 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1504 __func__, inode->i_ino, inode->i_size);
eee194e7 1505 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1506 inode->i_ino, inode->i_size);
1507 ext3_truncate(inode);
1508 nr_truncates++;
1509 } else {
1510 printk(KERN_DEBUG
eee194e7 1511 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1512 __func__, inode->i_ino);
eee194e7 1513 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1514 inode->i_ino);
1515 nr_orphans++;
1516 }
1517 iput(inode); /* The delete magic happens here! */
1518 }
1519
1520#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1521
1522 if (nr_orphans)
4cf46b67
AF		 1523 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1524 PLURAL(nr_orphans));
1da177e4 1525 if (nr_truncates)
4cf46b67
AF		 1526 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1527 PLURAL(nr_truncates));
1da177e4
LT		 1528#ifdef CONFIG_QUOTA
1529 /* Turn quotas off */
1530 for (i = 0; i < MAXQUOTAS; i++) {
1531 if (sb_dqopt(sb)->files[i])
287a8095 1532 dquot_quota_off(sb, i);
1da177e4
LT		 1533 }
1534#endif
1535 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1536}
1537
1da177e4
LT		 1538/*
1539 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1540 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1541 * We need to be 1 filesystem block less than the 2^32 sector limit.
1542 */
1543static loff_t ext3_max_size(int bits)
1544{
1545 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1546 int meta_blocks;
1547 loff_t upper_limit;
1548
1549 /* This is calculated to be the largest file size for a
1550 * dense, file such that the total number of
1da177e4 1551 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1552 * does not exceed 2^32 -1
1553 * __u32 i_blocks representing the total number of
1554 * 512 bytes blocks of the file
1555 */
1556 upper_limit = (1LL << 32) - 1;
1557
1558 /* total blocks in file system block size */
1559 upper_limit >>= (bits - 9);
1560
1561
1562 /* indirect blocks */
1563 meta_blocks = 1;
1564 /* double indirect blocks */
1565 meta_blocks += 1 + (1LL << (bits-2));
1566 /* tripple indirect blocks */
1567 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1568
1569 upper_limit -= meta_blocks;
1570 upper_limit <<= bits;
1da177e4
LT		 1571
1572 res += 1LL << (bits-2);
1573 res += 1LL << (2*(bits-2));
1574 res += 1LL << (3*(bits-2));
1575 res <<= bits;
1576 if (res > upper_limit)
1577 res = upper_limit;
fe7fdc37
AK		 1578
1579 if (res > MAX_LFS_FILESIZE)
1580 res = MAX_LFS_FILESIZE;
1581
1da177e4
LT		 1582 return res;
1583}
1584
43d23f90
MC		 1585static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1586 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1587 int nr)
1588{
1589 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1590 unsigned long bg, first_meta_bg;
1da177e4
LT		 1591 int has_super = 0;
1592
1da177e4
LT		 1593 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1594
1595 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1596 nr < first_meta_bg)
1597 return (logic_sb_block + nr + 1);
1598 bg = sbi->s_desc_per_block * nr;
1599 if (ext3_bg_has_super(sb, bg))
1600 has_super = 1;
43d23f90 1601 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1602}
1603
1604
1605static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1606{
1607 struct buffer_head * bh;
1608 struct ext3_super_block *es = NULL;
1609 struct ext3_sb_info *sbi;
43d23f90 1610 ext3_fsblk_t block;
4cf46b67 1611 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1612 ext3_fsblk_t logic_sb_block;
1da177e4 1613 unsigned long offset = 0;
eee194e7 1614 unsigned int journal_inum = 0;
71b96257 1615 unsigned long journal_devnum = 0;
1da177e4
LT		 1616 unsigned long def_mount_opts;
1617 struct inode *root;
1618 int blocksize;
1619 int hblock;
1620 int db_count;
1621 int i;
1622 int needs_recovery;
473043dc 1623 int ret = -EINVAL;
1da177e4 1624 __le32 features;
833f4077 1625 int err;
1da177e4 1626
f8314dc6 1627 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1628 if (!sbi)
1629 return -ENOMEM;
5df096d6
PE		 1630
1631 sbi->s_blockgroup_lock =
1632 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1633 if (!sbi->s_blockgroup_lock) {
1634 kfree(sbi);
1635 return -ENOMEM;
1636 }
1da177e4 1637 sb->s_fs_info = sbi;
1da177e4
LT		 1638 sbi->s_mount_opt = 0;
1639 sbi->s_resuid = EXT3_DEF_RESUID;
1640 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1641 sbi->s_sb_block = sb_block;
1da177e4
LT		 1642
1643 unlock_kernel();
1644
1645 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1646 if (!blocksize) {
4cf46b67 1647 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1648 goto out_fail;
1649 }
1650
1651 /*
1652 * The ext3 superblock will not be buffer aligned for other than 1kB
1653 * block sizes. We need to calculate the offset from buffer start.
1654 */
1655 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1656 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1657 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1658 } else {
1659 logic_sb_block = sb_block;
1660 }
1661
1662 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1663 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1664 goto out_fail;
1665 }
1666 /*
1667 * Note: s_es must be initialized as soon as possible because
1668 * some ext3 macro-instructions depend on its value
1669 */
1670 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1671 sbi->s_es = es;
1672 sb->s_magic = le16_to_cpu(es->s_magic);
1673 if (sb->s_magic != EXT3_SUPER_MAGIC)
1674 goto cantfind_ext3;
1675
1676 /* Set defaults before we parse the mount options */
1677 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1678 if (def_mount_opts & EXT3_DEFM_DEBUG)
1679 set_opt(sbi->s_mount_opt, DEBUG);
1680 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1681 set_opt(sbi->s_mount_opt, GRPID);
1682 if (def_mount_opts & EXT3_DEFM_UID16)
1683 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1684#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1685 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1686 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1687#endif
1688#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1689 if (def_mount_opts & EXT3_DEFM_ACL)
1690 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1691#endif
1da177e4 1692 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
e3c96435 1693 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1da177e4 1694 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
e3c96435 1695 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1da177e4 1696 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
e3c96435 1697 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1da177e4
LT		 1698
1699 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1700 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1701 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1702 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1703 else
1704 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1705
1706 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1707 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1708
1709 set_opt(sbi->s_mount_opt, RESERVATION);
1710
71b96257
JL		 1711 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1712 NULL, 0))
1da177e4
LT		 1713 goto failed_mount;
1714
1715 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 1716 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 1717
1718 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1719 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1720 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1721 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
AF		 1722 ext3_msg(sb, KERN_WARNING,
1723 "warning: feature flags set on rev 0 fs, "
1724 "running e2fsck is recommended");
1da177e4
LT		 1725 /*
1726 * Check feature flags regardless of the revision level, since we
1727 * previously didn't change the revision level when setting the flags,
1728 * so there is a chance incompat flags are set on a rev 0 filesystem.
1729 */
1730 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1731 if (features) {
4cf46b67
AF		 1732 ext3_msg(sb, KERN_ERR,
1733 "error: couldn't mount because of unsupported "
1734 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1735 goto failed_mount;
1736 }
1737 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1738 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
AF		 1739 ext3_msg(sb, KERN_ERR,
1740 "error: couldn't mount RDWR because of unsupported "
1741 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1742 goto failed_mount;
1743 }
1744 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1745
1746 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1747 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
AF		 1748 ext3_msg(sb, KERN_ERR,
1749 "error: couldn't mount because of unsupported "
1750 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1751 goto failed_mount;
1752 }
1753
e1defc4f 1754 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1755 if (sb->s_blocksize != blocksize) {
1756 /*
1757 * Make sure the blocksize for the filesystem is larger
1758 * than the hardware sectorsize for the machine.
1759 */
1760 if (blocksize < hblock) {
4cf46b67
AF		 1761 ext3_msg(sb, KERN_ERR,
1762 "error: fsblocksize %d too small for "
1763 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1764 goto failed_mount;
1765 }
1766
1767 brelse (bh);
0f0a89eb 1768 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
AF		 1769 ext3_msg(sb, KERN_ERR,
1770 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1771 goto out_fail;
1772 }
1da177e4
LT		 1773 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1774 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1775 bh = sb_bread(sb, logic_sb_block);
1776 if (!bh) {
4cf46b67
AF		 1777 ext3_msg(sb, KERN_ERR,
1778 "error: can't read superblock on 2nd try");
1da177e4
LT		 1779 goto failed_mount;
1780 }
1781 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1782 sbi->s_es = es;
1783 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
AF		 1784 ext3_msg(sb, KERN_ERR,
1785 "error: magic mismatch");
1da177e4
LT		 1786 goto failed_mount;
1787 }
1788 }
1789
1790 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1791
1792 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1793 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1794 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1795 } else {
1796 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1797 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1798 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1799 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1800 (sbi->s_inode_size > blocksize)) {
4cf46b67
AF		 1801 ext3_msg(sb, KERN_ERR,
1802 "error: unsupported inode size: %d",
1da177e4
LT		 1803 sbi->s_inode_size);
1804 goto failed_mount;
1805 }
1806 }
1807 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1808 le32_to_cpu(es->s_log_frag_size);
1809 if (blocksize != sbi->s_frag_size) {
4cf46b67
AF		 1810 ext3_msg(sb, KERN_ERR,
1811 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1812 sbi->s_frag_size, blocksize);
1813 goto failed_mount;
1814 }
1815 sbi->s_frags_per_block = 1;
1816 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1817 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1818 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1819 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1820 goto cantfind_ext3;
1821 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1822 if (sbi->s_inodes_per_block == 0)
1823 goto cantfind_ext3;
1824 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1825 sbi->s_inodes_per_block;
1826 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1827 sbi->s_sbh = bh;
1828 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1829 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1830 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1831 for (i=0; i < 4; i++)
1832 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1833 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1834 i = le32_to_cpu(es->s_flags);
1835 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1836 sbi->s_hash_unsigned = 3;
1837 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1838#ifdef __CHAR_UNSIGNED__
1839 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1840 sbi->s_hash_unsigned = 3;
1841#else
1842 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1843#endif
5e1f8c9e 1844 }
1da177e4
LT		 1845
1846 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
AF		 1847 ext3_msg(sb, KERN_ERR,
1848 "#blocks per group too big: %lu",
1da177e4
LT		 1849 sbi->s_blocks_per_group);
1850 goto failed_mount;
1851 }
1852 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
AF		 1853 ext3_msg(sb, KERN_ERR,
1854 "error: #fragments per group too big: %lu",
1da177e4
LT		 1855 sbi->s_frags_per_group);
1856 goto failed_mount;
1857 }
1858 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
AF		 1859 ext3_msg(sb, KERN_ERR,
1860 "error: #inodes per group too big: %lu",
1da177e4
LT		 1861 sbi->s_inodes_per_group);
1862 goto failed_mount;
1863 }
1864
fcd5df35
MC		 1865 if (le32_to_cpu(es->s_blocks_count) >
1866 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
4cf46b67
AF		 1867 ext3_msg(sb, KERN_ERR,
1868 "error: filesystem is too large to mount safely");
fcd5df35 1869 if (sizeof(sector_t) < 8)
4cf46b67
AF		 1870 ext3_msg(sb, KERN_ERR,
1871 "error: CONFIG_LBDAF not enabled");
fcd5df35
MC		 1872 goto failed_mount;
1873 }
1874
1da177e4
LT		 1875 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1876 goto cantfind_ext3;
855565e8
ES		 1877 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1878 le32_to_cpu(es->s_first_data_block) - 1)
1879 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 1880 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1881 EXT3_DESC_PER_BLOCK(sb);
1882 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1883 GFP_KERNEL);
1884 if (sbi->s_group_desc == NULL) {
4cf46b67
AF		 1885 ext3_msg(sb, KERN_ERR,
1886 "error: not enough memory");
1da177e4
LT		 1887 goto failed_mount;
1888 }
1889
5df096d6 1890 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1891
1892 for (i = 0; i < db_count; i++) {
1893 block = descriptor_loc(sb, logic_sb_block, i);
1894 sbi->s_group_desc[i] = sb_bread(sb, block);
1895 if (!sbi->s_group_desc[i]) {
4cf46b67
AF		 1896 ext3_msg(sb, KERN_ERR,
1897 "error: can't read group descriptor %d", i);
1da177e4
LT		 1898 db_count = i;
1899 goto failed_mount2;
1900 }
1901 }
1902 if (!ext3_check_descriptors (sb)) {
4cf46b67
AF		 1903 ext3_msg(sb, KERN_ERR,
1904 "error: group descriptors corrupted");
1da177e4
LT		 1905 goto failed_mount2;
1906 }
1907 sbi->s_gdb_count = db_count;
1908 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1909 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1910
1da177e4
LT		 1911 /* per fileystem reservation list head & lock */
1912 spin_lock_init(&sbi->s_rsv_window_lock);
1913 sbi->s_rsv_window_root = RB_ROOT;
1914 /* Add a single, static dummy reservation to the start of the
1915 * reservation window list --- it gives us a placeholder for
1916 * append-at-start-of-list which makes the allocation logic
1917 * _much_ simpler. */
1918 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1919 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1920 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1921 sbi->s_rsv_window_head.rsv_goal_size = 0;
1922 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1923
1924 /*
1925 * set up enough so that it can read an inode
1926 */
1927 sb->s_op = &ext3_sops;
1928 sb->s_export_op = &ext3_export_ops;
1929 sb->s_xattr = ext3_xattr_handlers;
1930#ifdef CONFIG_QUOTA
1931 sb->s_qcop = &ext3_qctl_operations;
1932 sb->dq_op = &ext3_quota_operations;
1933#endif
1934 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 1935 mutex_init(&sbi->s_orphan_lock);
96d2a495 1936 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 1937
1938 sb->s_root = NULL;
1939
1940 needs_recovery = (es->s_last_orphan != 0 ||
1941 EXT3_HAS_INCOMPAT_FEATURE(sb,
1942 EXT3_FEATURE_INCOMPAT_RECOVER));
1943
1944 /*
1945 * The first inode we look at is the journal inode. Don't try
1946 * root first: it may be modified in the journal!
1947 */
1948 if (!test_opt(sb, NOLOAD) &&
1949 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1950 if (ext3_load_journal(sb, es, journal_devnum))
41d1a636 1951 goto failed_mount2;
1da177e4
LT		 1952 } else if (journal_inum) {
1953 if (ext3_create_journal(sb, es, journal_inum))
41d1a636 1954 goto failed_mount2;
1da177e4
LT		 1955 } else {
1956 if (!silent)
4cf46b67
AF		 1957 ext3_msg(sb, KERN_ERR,
1958 "error: no journal found. "
1959 "mounting ext3 over ext2?");
41d1a636
DM		 1960 goto failed_mount2;
1961 }
1962 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1963 ext3_count_free_blocks(sb));
1964 if (!err) {
1965 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1966 ext3_count_free_inodes(sb));
1967 }
1968 if (!err) {
1969 err = percpu_counter_init(&sbi->s_dirs_counter,
1970 ext3_count_dirs(sb));
1971 }
1972 if (err) {
1973 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
0216bfcf 1974 goto failed_mount3;
1da177e4
LT		 1975 }
1976
1977 /* We have now updated the journal if required, so we can
1978 * validate the data journaling mode. */
1979 switch (test_opt(sb, DATA_FLAGS)) {
1980 case 0:
1981 /* No mode set, assume a default based on the journal
1982 capabilities: ORDERED_DATA if the journal can
1983 cope, else JOURNAL_DATA */
1984 if (journal_check_available_features
1985 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 1986 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 1987 else
1988 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1989 break;
1990
1991 case EXT3_MOUNT_ORDERED_DATA:
1992 case EXT3_MOUNT_WRITEBACK_DATA:
1993 if (!journal_check_available_features
1994 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
AF		 1995 ext3_msg(sb, KERN_ERR,
1996 "error: journal does not support "
1997 "requested data journaling mode");
41d1a636 1998 goto failed_mount3;
1da177e4
LT		 1999 }
2000 default:
2001 break;
2002 }
2003
2004 if (test_opt(sb, NOBH)) {
1da177e4 2005 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
4cf46b67
AF		 2006 ext3_msg(sb, KERN_WARNING,
2007 "warning: ignoring nobh option - "
2008 "it is supported only with writeback mode");
1da177e4
LT		 2009 clear_opt(sbi->s_mount_opt, NOBH);
2010 }
2011 }
2012 /*
2013 * The journal_load will have done any necessary log recovery,
2014 * so we can safely mount the rest of the filesystem now.
2015 */
2016
473043dc
DH		 2017 root = ext3_iget(sb, EXT3_ROOT_INO);
2018 if (IS_ERR(root)) {
4cf46b67 2019 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 2020 ret = PTR_ERR(root);
41d1a636 2021 goto failed_mount3;
1da177e4
LT		 2022 }
2023 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2024 iput(root);
4cf46b67 2025 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
41d1a636 2026 goto failed_mount3;
1da177e4 2027 }
473043dc
DH		 2028 sb->s_root = d_alloc_root(root);
2029 if (!sb->s_root) {
4cf46b67 2030 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc
DH		 2031 iput(root);
2032 ret = -ENOMEM;
41d1a636 2033 goto failed_mount3;
473043dc 2034 }
1da177e4
LT		 2035
2036 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ed505ee4 2037
1da177e4
LT		 2038 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2039 ext3_orphan_cleanup(sb, es);
2040 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2041 if (needs_recovery)
4cf46b67 2042 ext3_msg(sb, KERN_INFO, "recovery complete");
1da177e4 2043 ext3_mark_recovery_complete(sb, es);
4cf46b67 2044 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2045 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2046 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2047 "writeback");
2048
1da177e4
LT		 2049 lock_kernel();
2050 return 0;
2051
2052cantfind_ext3:
2053 if (!silent)
4cf46b67
AF		 2054 ext3_msg(sb, KERN_INFO,
2055 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2056 sb->s_id);
2057 goto failed_mount;
2058
0216bfcf
MC		 2059failed_mount3:
2060 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2061 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2062 percpu_counter_destroy(&sbi->s_dirs_counter);
41d1a636 2063 journal_destroy(sbi->s_journal);
1da177e4
LT		 2064failed_mount2:
2065 for (i = 0; i < db_count; i++)
2066 brelse(sbi->s_group_desc[i]);
2067 kfree(sbi->s_group_desc);
2068failed_mount:
2069#ifdef CONFIG_QUOTA
2070 for (i = 0; i < MAXQUOTAS; i++)
2071 kfree(sbi->s_qf_names[i]);
2072#endif
2073 ext3_blkdev_remove(sbi);
2074 brelse(bh);
2075out_fail:
2076 sb->s_fs_info = NULL;
de5ce037 2077 kfree(sbi->s_blockgroup_lock);
1da177e4
LT		 2078 kfree(sbi);
2079 lock_kernel();
473043dc 2080 return ret;
1da177e4
LT		 2081}
2082
2083/*
2084 * Setup any per-fs journal parameters now. We'll do this both on
2085 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2086 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2087 */
2088static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2089{
2090 struct ext3_sb_info *sbi = EXT3_SB(sb);
2091
2092 if (sbi->s_commit_interval)
2093 journal->j_commit_interval = sbi->s_commit_interval;
2094 /* We could also set up an ext3-specific default for the commit
2095 * interval here, but for now we'll just fall back to the jbd
2096 * default. */
2097
2098 spin_lock(&journal->j_state_lock);
2099 if (test_opt(sb, BARRIER))
2100 journal->j_flags |= JFS_BARRIER;
2101 else
2102 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2103 if (test_opt(sb, DATA_ERR_ABORT))
2104 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2105 else
2106 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2107 spin_unlock(&journal->j_state_lock);
2108}
2109
eee194e7
ES		 2110static journal_t *ext3_get_journal(struct super_block *sb,
2111 unsigned int journal_inum)
1da177e4
LT		 2112{
2113 struct inode *journal_inode;
2114 journal_t *journal;
2115
2116 /* First, test for the existence of a valid inode on disk. Bad
2117 * things happen if we iget() an unused inode, as the subsequent
2118 * iput() will try to delete it. */
2119
473043dc
DH		 2120 journal_inode = ext3_iget(sb, journal_inum);
2121 if (IS_ERR(journal_inode)) {
4cf46b67 2122 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2123 return NULL;
2124 }
2125 if (!journal_inode->i_nlink) {
2126 make_bad_inode(journal_inode);
2127 iput(journal_inode);
4cf46b67 2128 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2129 return NULL;
2130 }
2131
2132 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2133 journal_inode, journal_inode->i_size);
473043dc 2134 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2135 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2136 iput(journal_inode);
2137 return NULL;
2138 }
2139
2140 journal = journal_init_inode(journal_inode);
2141 if (!journal) {
4cf46b67 2142 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2143 iput(journal_inode);
2144 return NULL;
2145 }
2146 journal->j_private = sb;
2147 ext3_init_journal_params(sb, journal);
2148 return journal;
2149}
2150
2151static journal_t *ext3_get_dev_journal(struct super_block *sb,
2152 dev_t j_dev)
2153{
2154 struct buffer_head * bh;
2155 journal_t *journal;
43d23f90 2156 ext3_fsblk_t start;
1c2bf374 2157 ext3_fsblk_t len;
1da177e4 2158 int hblock, blocksize;
43d23f90 2159 ext3_fsblk_t sb_block;
1da177e4
LT		 2160 unsigned long offset;
2161 struct ext3_super_block * es;
2162 struct block_device *bdev;
2163
4cf46b67 2164 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2165 if (bdev == NULL)
2166 return NULL;
2167
2168 if (bd_claim(bdev, sb)) {
4cf46b67
AF		 2169 ext3_msg(sb, KERN_ERR,
2170 "error: failed to claim external journal device");
9a1c3542 2171 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 2172 return NULL;
2173 }
2174
2175 blocksize = sb->s_blocksize;
e1defc4f 2176 hblock = bdev_logical_block_size(bdev);
1da177e4 2177 if (blocksize < hblock) {
4cf46b67
AF		 2178 ext3_msg(sb, KERN_ERR,
2179 "error: blocksize too small for journal device");
1da177e4
LT		 2180 goto out_bdev;
2181 }
2182
2183 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2184 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2185 set_blocksize(bdev, blocksize);
2186 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
AF		 2187 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2188 "external journal");
1da177e4
LT		 2189 goto out_bdev;
2190 }
2191
2192 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2193 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2194 !(le32_to_cpu(es->s_feature_incompat) &
2195 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
AF		 2196 ext3_msg(sb, KERN_ERR, "error: external journal has "
2197 "bad superblock");
1da177e4
LT		 2198 brelse(bh);
2199 goto out_bdev;
2200 }
2201
2202 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2203 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2204 brelse(bh);
2205 goto out_bdev;
2206 }
2207
2208 len = le32_to_cpu(es->s_blocks_count);
2209 start = sb_block + 1;
2210 brelse(bh); /* we're done with the superblock */
2211
2212 journal = journal_init_dev(bdev, sb->s_bdev,
2213 start, len, blocksize);
2214 if (!journal) {
4cf46b67
AF		 2215 ext3_msg(sb, KERN_ERR,
2216 "error: failed to create device journal");
1da177e4
LT		 2217 goto out_bdev;
2218 }
2219 journal->j_private = sb;
2220 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2221 wait_on_buffer(journal->j_sb_buffer);
2222 if (!buffer_uptodate(journal->j_sb_buffer)) {
4cf46b67 2223 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
1da177e4
LT		 2224 goto out_journal;
2225 }
2226 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
AF		 2227 ext3_msg(sb, KERN_ERR,
2228 "error: external journal has more than one "
2229 "user (unsupported) - %d",
1da177e4
LT		 2230 be32_to_cpu(journal->j_superblock->s_nr_users));
2231 goto out_journal;
2232 }
2233 EXT3_SB(sb)->journal_bdev = bdev;
2234 ext3_init_journal_params(sb, journal);
2235 return journal;
2236out_journal:
2237 journal_destroy(journal);
2238out_bdev:
2239 ext3_blkdev_put(bdev);
2240 return NULL;
2241}
2242
71b96257
JL		 2243static int ext3_load_journal(struct super_block *sb,
2244 struct ext3_super_block *es,
2245 unsigned long journal_devnum)
1da177e4
LT		 2246{
2247 journal_t *journal;
eee194e7 2248 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2249 dev_t journal_dev;
1da177e4
LT		 2250 int err = 0;
2251 int really_read_only;
2252
71b96257
JL		 2253 if (journal_devnum &&
2254 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
AF		 2255 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2256 "numbers have changed");
71b96257
JL		 2257 journal_dev = new_decode_dev(journal_devnum);
2258 } else
2259 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2260
1da177e4
LT		 2261 really_read_only = bdev_read_only(sb->s_bdev);
2262
2263 /*
2264 * Are we loading a blank journal or performing recovery after a
2265 * crash? For recovery, we need to check in advance whether we
2266 * can get read-write access to the device.
2267 */
2268
2269 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2270 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2271 ext3_msg(sb, KERN_INFO,
2272 "recovery required on readonly filesystem");
1da177e4 2273 if (really_read_only) {
4cf46b67
AF		 2274 ext3_msg(sb, KERN_ERR, "error: write access "
2275 "unavailable, cannot proceed");
1da177e4
LT		 2276 return -EROFS;
2277 }
4cf46b67
AF		 2278 ext3_msg(sb, KERN_INFO,
2279 "write access will be enabled during recovery");
1da177e4
LT		 2280 }
2281 }
2282
2283 if (journal_inum && journal_dev) {
4cf46b67
AF		 2284 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2285 "and inode journals");
1da177e4
LT		 2286 return -EINVAL;
2287 }
2288
2289 if (journal_inum) {
2290 if (!(journal = ext3_get_journal(sb, journal_inum)))
2291 return -EINVAL;
2292 } else {
2293 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2294 return -EINVAL;
2295 }
2296
0636c73e
ES		 2297 if (!(journal->j_flags & JFS_BARRIER))
2298 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2299
1da177e4
LT		 2300 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2301 err = journal_update_format(journal);
2302 if (err) {
4cf46b67 2303 ext3_msg(sb, KERN_ERR, "error updating journal");
1da177e4
LT		 2304 journal_destroy(journal);
2305 return err;
2306 }
2307 }
2308
2309 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2310 err = journal_wipe(journal, !really_read_only);
2311 if (!err)
2312 err = journal_load(journal);
2313
2314 if (err) {
4cf46b67 2315 ext3_msg(sb, KERN_ERR, "error loading journal");
1da177e4
LT		 2316 journal_destroy(journal);
2317 return err;
2318 }
2319
2320 EXT3_SB(sb)->s_journal = journal;
2321 ext3_clear_journal_err(sb, es);
71b96257
JL		 2322
2323 if (journal_devnum &&
2324 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2325 es->s_journal_dev = cpu_to_le32(journal_devnum);
71b96257
JL		 2326
2327 /* Make sure we flush the recovery flag to disk. */
2328 ext3_commit_super(sb, es, 1);
2329 }
2330
1da177e4
LT		 2331 return 0;
2332}
2333
4cf46b67
AF		 2334static int ext3_create_journal(struct super_block *sb,
2335 struct ext3_super_block *es,
eee194e7 2336 unsigned int journal_inum)
1da177e4
LT		 2337{
2338 journal_t *journal;
952d9de1 2339 int err;
1da177e4
LT		 2340
2341 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2342 ext3_msg(sb, KERN_ERR,
2343 "error: readonly filesystem when trying to "
2344 "create journal");
1da177e4
LT		 2345 return -EROFS;
2346 }
2347
952d9de1
BP		 2348 journal = ext3_get_journal(sb, journal_inum);
2349 if (!journal)
1da177e4
LT		 2350 return -EINVAL;
2351
4cf46b67 2352 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
1da177e4
LT		 2353 journal_inum);
2354
952d9de1
BP		 2355 err = journal_create(journal);
2356 if (err) {
4cf46b67 2357 ext3_msg(sb, KERN_ERR, "error creating journal");
1da177e4
LT		 2358 journal_destroy(journal);
2359 return -EIO;
2360 }
2361
2362 EXT3_SB(sb)->s_journal = journal;
2363
2364 ext3_update_dynamic_rev(sb);
2365 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2366 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2367
2368 es->s_journal_inum = cpu_to_le32(journal_inum);
1da177e4
LT		 2369
2370 /* Make sure we flush the recovery flag to disk. */
2371 ext3_commit_super(sb, es, 1);
2372
2373 return 0;
2374}
2375
c4be0c1d
TS		 2376static int ext3_commit_super(struct super_block *sb,
2377 struct ext3_super_block *es,
1da177e4
LT		 2378 int sync)
2379{
2380 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2381 int error = 0;
1da177e4
LT		 2382
2383 if (!sbh)
c4be0c1d 2384 return error;
96ec2e0a
TT		 2385 /*
2386 * If the file system is mounted read-only, don't update the
2387 * superblock write time. This avoids updating the superblock
2388 * write time when we are mounting the root file system
2389 * read/only but we need to replay the journal; at that point,
2390 * for people who are east of GMT and who make their clock
2391 * tick in localtime for Windows bug-for-bug compatibility,
2392 * the clock is set in the future, and this will cause e2fsck
2393 * to complain and force a full file system check.
2394 */
2395 if (!(sb->s_flags & MS_RDONLY))
2396 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2397 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2398 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2399 BUFFER_TRACE(sbh, "marking dirty");
2400 mark_buffer_dirty(sbh);
2401 if (sync)
c4be0c1d
TS		 2402 error = sync_dirty_buffer(sbh);
2403 return error;
1da177e4
LT		 2404}
2405
2406
2407/*
2408 * Have we just finished recovery? If so, and if we are mounting (or
2409 * remounting) the filesystem readonly, then we will end up with a
2410 * consistent fs on disk. Record that fact.
2411 */
2412static void ext3_mark_recovery_complete(struct super_block * sb,
2413 struct ext3_super_block * es)
2414{
2415 journal_t *journal = EXT3_SB(sb)->s_journal;
2416
2417 journal_lock_updates(journal);
2d7c820e
HK		 2418 if (journal_flush(journal) < 0)
2419 goto out;
2420
1da177e4
LT		 2421 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2422 sb->s_flags & MS_RDONLY) {
2423 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2424 ext3_commit_super(sb, es, 1);
2425 }
2d7c820e
HK		 2426
2427out:
1da177e4
LT		 2428 journal_unlock_updates(journal);
2429}
2430
2431/*
2432 * If we are mounting (or read-write remounting) a filesystem whose journal
2433 * has recorded an error from a previous lifetime, move that error to the
2434 * main filesystem now.
2435 */
4cf46b67
AF		 2436static void ext3_clear_journal_err(struct super_block *sb,
2437 struct ext3_super_block *es)
1da177e4
LT		 2438{
2439 journal_t *journal;
2440 int j_errno;
2441 const char *errstr;
2442
2443 journal = EXT3_SB(sb)->s_journal;
2444
2445 /*
2446 * Now check for any error status which may have been recorded in the
2447 * journal by a prior ext3_error() or ext3_abort()
2448 */
2449
2450 j_errno = journal_errno(journal);
2451 if (j_errno) {
2452 char nbuf[16];
2453
2454 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2455 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2456 "from previous mount: %s", errstr);
e05b6b52 2457 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2458 "filesystem check.");
2459
2460 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2461 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2462 ext3_commit_super (sb, es, 1);
2463
2464 journal_clear_err(journal);
2465 }
2466}
2467
2468/*
2469 * Force the running and committing transactions to commit,
2470 * and wait on the commit.
2471 */
2472int ext3_force_commit(struct super_block *sb)
2473{
2474 journal_t *journal;
2475 int ret;
2476
2477 if (sb->s_flags & MS_RDONLY)
2478 return 0;
2479
2480 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2481 ret = ext3_journal_force_commit(journal);
2482 return ret;
2483}
2484
1da177e4
LT		 2485static int ext3_sync_fs(struct super_block *sb, int wait)
2486{
02ac597c 2487 tid_t target;
c87591b7 2488
02ac597c
JK		 2489 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2490 if (wait)
2491 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2492 }
1da177e4
LT		 2493 return 0;
2494}
2495
2496/*
2497 * LVM calls this function before a (read-only) snapshot is created. This
2498 * gives us a chance to flush the journal completely and mark the fs clean.
2499 */
c4be0c1d 2500static int ext3_freeze(struct super_block *sb)
1da177e4 2501{
c4be0c1d
TS		 2502 int error = 0;
2503 journal_t *journal;
1da177e4
LT		 2504
2505 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2506 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2507
2508 /* Now we set up the journal barrier. */
2509 journal_lock_updates(journal);
2d7c820e
HK		 2510
2511 /*
2512 * We don't want to clear needs_recovery flag when we failed
2513 * to flush the journal.
2514 */
c4be0c1d
TS		 2515 error = journal_flush(journal);
2516 if (error < 0)
2517 goto out;
1da177e4
LT		 2518
2519 /* Journal blocked and flushed, clear needs_recovery flag. */
2520 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2521 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2522 if (error)
2523 goto out;
1da177e4 2524 }
c4be0c1d
TS		 2525 return 0;
2526
2527out:
2528 journal_unlock_updates(journal);
2529 return error;
1da177e4
LT		 2530}
2531
2532/*
2533 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2534 * flag here, even though the filesystem is not technically dirty yet.
2535 */
c4be0c1d 2536static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2537{
2538 if (!(sb->s_flags & MS_RDONLY)) {
2539 lock_super(sb);
2540 /* Reser the needs_recovery flag before the fs is unlocked. */
2541 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2542 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2543 unlock_super(sb);
2544 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2545 }
c4be0c1d 2546 return 0;
1da177e4
LT		 2547}
2548
2549static int ext3_remount (struct super_block * sb, int * flags, char * data)
2550{
2551 struct ext3_super_block * es;
2552 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2553 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2554 unsigned long old_sb_flags;
2555 struct ext3_mount_options old_opts;
c79d967d 2556 int enable_quota = 0;
08c6a96f
JK		 2557 int err;
2558#ifdef CONFIG_QUOTA
2559 int i;
2560#endif
2561
337eb00a
AIB		 2562 lock_kernel();
2563
08c6a96f 2564 /* Store the original options */
bbd6851a 2565 lock_super(sb);
08c6a96f
JK		 2566 old_sb_flags = sb->s_flags;
2567 old_opts.s_mount_opt = sbi->s_mount_opt;
2568 old_opts.s_resuid = sbi->s_resuid;
2569 old_opts.s_resgid = sbi->s_resgid;
2570 old_opts.s_commit_interval = sbi->s_commit_interval;
2571#ifdef CONFIG_QUOTA
2572 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2573 for (i = 0; i < MAXQUOTAS; i++)
2574 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2575#endif
1da177e4
LT		 2576
2577 /*
2578 * Allow the "check" option to be passed as a remount option.
2579 */
71b96257 2580 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2581 err = -EINVAL;
2582 goto restore_opts;
2583 }
1da177e4 2584
e3c96435 2585 if (test_opt(sb, ABORT))
e05b6b52 2586 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2587
2588 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 2589 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 2590
2591 es = sbi->s_es;
2592
2593 ext3_init_journal_params(sb, sbi->s_journal);
2594
2595 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2596 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
e3c96435 2597 if (test_opt(sb, ABORT)) {
08c6a96f
JK		 2598 err = -EROFS;
2599 goto restore_opts;
2600 }
1da177e4
LT		 2601
2602 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 2603 err = dquot_suspend(sb, -1);
2604 if (err < 0)
c79d967d 2605 goto restore_opts;
c79d967d 2606
1da177e4
LT		 2607 /*
2608 * First of all, the unconditional stuff we have to do
2609 * to disable replay of the journal when we next remount
2610 */
2611 sb->s_flags |= MS_RDONLY;
2612
2613 /*
2614 * OK, test if we are remounting a valid rw partition
2615 * readonly, and if so set the rdonly flag and then
2616 * mark the partition as valid again.
2617 */
2618 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2619 (sbi->s_mount_state & EXT3_VALID_FS))
2620 es->s_state = cpu_to_le16(sbi->s_mount_state);
2621
2622 ext3_mark_recovery_complete(sb, es);
2623 } else {
2624 __le32 ret;
2625 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2626 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
AF		 2627 ext3_msg(sb, KERN_WARNING,
2628 "warning: couldn't remount RDWR "
2629 "because of unsupported optional "
2630 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2631 err = -EROFS;
2632 goto restore_opts;
1da177e4 2633 }
ea9a05a1
ES		 2634
2635 /*
2636 * If we have an unprocessed orphan list hanging
2637 * around from a previously readonly bdev mount,
2638 * require a full umount/remount for now.
2639 */
2640 if (es->s_last_orphan) {
4cf46b67 2641 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2642 "remount RDWR because of unprocessed "
2643 "orphan inode list. Please "
4cf46b67 2644 "umount/remount instead.");
ea9a05a1
ES		 2645 err = -EINVAL;
2646 goto restore_opts;
2647 }
2648
1da177e4
LT		 2649 /*
2650 * Mounting a RDONLY partition read-write, so reread
2651 * and store the current valid flag. (It may have
2652 * been changed by e2fsck since we originally mounted
2653 * the partition.)
2654 */
2655 ext3_clear_journal_err(sb, es);
2656 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2657 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2658 goto restore_opts;
1da177e4
LT		 2659 if (!ext3_setup_super (sb, es, 0))
2660 sb->s_flags &= ~MS_RDONLY;
c79d967d 2661 enable_quota = 1;
1da177e4
LT		 2662 }
2663 }
08c6a96f
JK		 2664#ifdef CONFIG_QUOTA
2665 /* Release old quota file names */
2666 for (i = 0; i < MAXQUOTAS; i++)
2667 if (old_opts.s_qf_names[i] &&
2668 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2669 kfree(old_opts.s_qf_names[i]);
2670#endif
bbd6851a 2671 unlock_super(sb);
337eb00a 2672 unlock_kernel();
c79d967d
CH		 2673
2674 if (enable_quota)
0f0dd62f 2675 dquot_resume(sb, -1);
1da177e4 2676 return 0;
08c6a96f
JK		 2677restore_opts:
2678 sb->s_flags = old_sb_flags;
2679 sbi->s_mount_opt = old_opts.s_mount_opt;
2680 sbi->s_resuid = old_opts.s_resuid;
2681 sbi->s_resgid = old_opts.s_resgid;
2682 sbi->s_commit_interval = old_opts.s_commit_interval;
2683#ifdef CONFIG_QUOTA
2684 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2685 for (i = 0; i < MAXQUOTAS; i++) {
2686 if (sbi->s_qf_names[i] &&
2687 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2688 kfree(sbi->s_qf_names[i]);
2689 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2690 }
2691#endif
bbd6851a 2692 unlock_super(sb);
337eb00a 2693 unlock_kernel();
08c6a96f 2694 return err;
1da177e4
LT		 2695}
2696
726c3342 2697static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2698{
726c3342 2699 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2700 struct ext3_sb_info *sbi = EXT3_SB(sb);
2701 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2702 u64 fsid;
1da177e4 2703
a71ce8c6
BP		 2704 if (test_opt(sb, MINIX_DF)) {
2705 sbi->s_overhead_last = 0;
2706 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2707 unsigned long ngroups = sbi->s_groups_count, i;
2708 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2709 smp_rmb();
2710
2711 /*
a71ce8c6
BP		 2712 * Compute the overhead (FS structures). This is constant
2713 * for a given filesystem unless the number of block groups
2714 * changes so we cache the previous value until it does.
1da177e4
LT		 2715 */
2716
2717 /*
2718 * All of the blocks before first_data_block are
2719 * overhead
2720 */
2721 overhead = le32_to_cpu(es->s_first_data_block);
2722
2723 /*
2724 * Add the overhead attributed to the superblock and
2725 * block group descriptors. If the sparse superblocks
2726 * feature is turned on, then not all groups have this.
2727 */
2728 for (i = 0; i < ngroups; i++) {
2729 overhead += ext3_bg_has_super(sb, i) +
2730 ext3_bg_num_gdb(sb, i);
2731 cond_resched();
2732 }
2733
2734 /*
2735 * Every block group has an inode bitmap, a block
2736 * bitmap, and an inode table.
2737 */
a71ce8c6
BP		 2738 overhead += ngroups * (2 + sbi->s_itb_per_group);
2739 sbi->s_overhead_last = overhead;
2740 smp_wmb();
2741 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2742 }
2743
2744 buf->f_type = EXT3_SUPER_MAGIC;
2745 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2746 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2747 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2748 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2749 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2750 buf->f_bavail = 0;
2751 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2752 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2753 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2754 fsid = le64_to_cpup((void *)es->s_uuid) ^
2755 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2756 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2757 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2758 return 0;
2759}
2760
2761/* Helper function for writing quotas on sync - we need to start transaction before quota file
2762 * is locked for write. Otherwise the are possible deadlocks:
2763 * Process 1 Process 2
2764 * ext3_create() quota_sync()
2765 * journal_start() write_dquot()
871a2931 2766 * dquot_initialize() down(dqio_mutex)
d3be915f 2767 * down(dqio_mutex) journal_start()
1da177e4
LT		 2768 *
2769 */
2770
2771#ifdef CONFIG_QUOTA
2772
2773static inline struct inode *dquot_to_inode(struct dquot *dquot)
2774{
2775 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2776}
2777
1da177e4
LT		 2778static int ext3_write_dquot(struct dquot *dquot)
2779{
2780 int ret, err;
2781 handle_t *handle;
2782 struct inode *inode;
2783
2784 inode = dquot_to_inode(dquot);
2785 handle = ext3_journal_start(inode,
1f54587b 2786 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2787 if (IS_ERR(handle))
2788 return PTR_ERR(handle);
2789 ret = dquot_commit(dquot);
2790 err = ext3_journal_stop(handle);
2791 if (!ret)
2792 ret = err;
2793 return ret;
2794}
2795
2796static int ext3_acquire_dquot(struct dquot *dquot)
2797{
2798 int ret, err;
2799 handle_t *handle;
2800
2801 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2802 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2803 if (IS_ERR(handle))
2804 return PTR_ERR(handle);
2805 ret = dquot_acquire(dquot);
2806 err = ext3_journal_stop(handle);
2807 if (!ret)
2808 ret = err;
2809 return ret;
2810}
2811
2812static int ext3_release_dquot(struct dquot *dquot)
2813{
2814 int ret, err;
2815 handle_t *handle;
2816
2817 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2818 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2819 if (IS_ERR(handle)) {
2820 /* Release dquot anyway to avoid endless cycle in dqput() */
2821 dquot_release(dquot);
1da177e4 2822 return PTR_ERR(handle);
9c3013e9 2823 }
1da177e4
LT		 2824 ret = dquot_release(dquot);
2825 err = ext3_journal_stop(handle);
2826 if (!ret)
2827 ret = err;
2828 return ret;
2829}
2830
2831static int ext3_mark_dquot_dirty(struct dquot *dquot)
2832{
99aeaf63 2833 /* Are we journaling quotas? */
1da177e4
LT		 2834 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2835 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2836 dquot_mark_dquot_dirty(dquot);
2837 return ext3_write_dquot(dquot);
2838 } else {
2839 return dquot_mark_dquot_dirty(dquot);
2840 }
2841}
2842
2843static int ext3_write_info(struct super_block *sb, int type)
2844{
2845 int ret, err;
2846 handle_t *handle;
2847
2848 /* Data block + inode block */
2849 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2850 if (IS_ERR(handle))
2851 return PTR_ERR(handle);
2852 ret = dquot_commit_info(sb, type);
2853 err = ext3_journal_stop(handle);
2854 if (!ret)
2855 ret = err;
2856 return ret;
2857}
2858
2859/*
2860 * Turn on quotas during mount time - we need to find
2861 * the quota file and such...
2862 */
2863static int ext3_quota_on_mount(struct super_block *sb, int type)
2864{
287a8095
CH		 2865 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2866 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2867}
2868
2869/*
2870 * Standard function to be called on quota_on
2871 */
2872static int ext3_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 2873 char *name)
1da177e4
LT		 2874{
2875 int err;
8264613d 2876 struct path path;
1da177e4 2877
1f54587b
JK		 2878 if (!test_opt(sb, QUOTA))
2879 return -EINVAL;
9cfe7b90 2880
8264613d 2881 err = kern_path(name, LOOKUP_FOLLOW, &path);
1da177e4
LT		 2882 if (err)
2883 return err;
9cfe7b90 2884
1da177e4 2885 /* Quotafile not on the same filesystem? */
8264613d
AV		 2886 if (path.mnt->mnt_sb != sb) {
2887 path_put(&path);
1da177e4
LT		 2888 return -EXDEV;
2889 }
9cfe7b90
JK		 2890 /* Journaling quota? */
2891 if (EXT3_SB(sb)->s_qf_names[type]) {
2892 /* Quotafile not of fs root? */
8264613d 2893 if (path.dentry->d_parent != sb->s_root)
4cf46b67
AF		 2894 ext3_msg(sb, KERN_WARNING,
2895 "warning: Quota file not on filesystem root. "
2896 "Journaled quota will not work.");
9cfe7b90
JK		 2897 }
2898
2899 /*
2900 * When we journal data on quota file, we have to flush journal to see
2901 * all updates to the file when we bypass pagecache...
2902 */
8264613d 2903 if (ext3_should_journal_data(path.dentry->d_inode)) {
9cfe7b90
JK		 2904 /*
2905 * We don't need to lock updates but journal_flush() could
2906 * otherwise be livelocked...
2907 */
2908 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2909 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2910 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2911 if (err) {
12e1ec9f 2912 path_put(&path);
2d7c820e
HK		 2913 return err;
2914 }
9cfe7b90
JK		 2915 }
2916
287a8095 2917 err = dquot_quota_on_path(sb, type, format_id, &path);
8264613d 2918 path_put(&path);
77e69dac 2919 return err;
1da177e4
LT		 2920}
2921
2922/* Read data from quotafile - avoid pagecache and such because we cannot afford
2923 * acquiring the locks... As quota files are never truncated and quota code
2924 * itself serializes the operations (and noone else should touch the files)
2925 * we don't have to be afraid of races */
2926static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2927 size_t len, loff_t off)
2928{
2929 struct inode *inode = sb_dqopt(sb)->files[type];
2930 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2931 int err = 0;
2932 int offset = off & (sb->s_blocksize - 1);
2933 int tocopy;
2934 size_t toread;
2935 struct buffer_head *bh;
2936 loff_t i_size = i_size_read(inode);
2937
2938 if (off > i_size)
2939 return 0;
2940 if (off+len > i_size)
2941 len = i_size-off;
2942 toread = len;
2943 while (toread > 0) {
2944 tocopy = sb->s_blocksize - offset < toread ?
2945 sb->s_blocksize - offset : toread;
2946 bh = ext3_bread(NULL, inode, blk, 0, &err);
2947 if (err)
2948 return err;
2949 if (!bh) /* A hole? */
2950 memset(data, 0, tocopy);
2951 else
2952 memcpy(data, bh->b_data+offset, tocopy);
2953 brelse(bh);
2954 offset = 0;
2955 toread -= tocopy;
2956 data += tocopy;
2957 blk++;
2958 }
2959 return len;
2960}
2961
2962/* Write to quotafile (we know the transaction is already started and has
2963 * enough credits) */
2964static ssize_t ext3_quota_write(struct super_block *sb, int type,
2965 const char *data, size_t len, loff_t off)
2966{
2967 struct inode *inode = sb_dqopt(sb)->files[type];
2968 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2969 int err = 0;
2970 int offset = off & (sb->s_blocksize - 1);
1da177e4 2971 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
1da177e4
LT		 2972 struct buffer_head *bh;
2973 handle_t *handle = journal_current_handle();
2974
9c3013e9 2975 if (!handle) {
4cf46b67
AF		 2976 ext3_msg(sb, KERN_WARNING,
2977 "warning: quota write (off=%llu, len=%llu)"
2978 " cancelled because transaction is not started.",
9c3013e9
JK		 2979 (unsigned long long)off, (unsigned long long)len);
2980 return -EIO;
2981 }
e5472147
DM		 2982
2983 /*
2984 * Since we account only one data block in transaction credits,
2985 * then it is impossible to cross a block boundary.
2986 */
2987 if (sb->s_blocksize - offset < len) {
2988 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2989 " cancelled because not block aligned",
2990 (unsigned long long)off, (unsigned long long)len);
2991 return -EIO;
2992 }
5c81a419 2993 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
e5472147
DM		 2994 bh = ext3_bread(handle, inode, blk, 1, &err);
2995 if (!bh)
2996 goto out;
2997 if (journal_quota) {
2998 err = ext3_journal_get_write_access(handle, bh);
2999 if (err) {
3000 brelse(bh);
1da177e4 3001 goto out;
1da177e4 3002 }
1da177e4 3003 }
e5472147
DM		 3004 lock_buffer(bh);
3005 memcpy(bh->b_data+offset, data, len);
3006 flush_dcache_page(bh->b_page);
3007 unlock_buffer(bh);
3008 if (journal_quota)
3009 err = ext3_journal_dirty_metadata(handle, bh);
3010 else {
3011 /* Always do at least ordered writes for quotas */
3012 err = ext3_journal_dirty_data(handle, bh);
3013 mark_buffer_dirty(bh);
3014 }
3015 brelse(bh);
1da177e4 3016out:
e5472147 3017 if (err) {
f5c8f7da 3018 mutex_unlock(&inode->i_mutex);
1da177e4 3019 return err;
f5c8f7da 3020 }
e5472147
DM		 3021 if (inode->i_size < off + len) {
3022 i_size_write(inode, off + len);
1da177e4
LT		 3023 EXT3_I(inode)->i_disksize = inode->i_size;
3024 }
3025 inode->i_version++;
3026 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3027 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 3028 mutex_unlock(&inode->i_mutex);
e5472147 3029 return len;
1da177e4
LT		 3030}
3031
3032#endif
3033
454e2398
DH		 3034static int ext3_get_sb(struct file_system_type *fs_type,
3035 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 3036{
454e2398 3037 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
1da177e4
LT		 3038}
3039
3040static struct file_system_type ext3_fs_type = {
3041 .owner = THIS_MODULE,
3042 .name = "ext3",
3043 .get_sb = ext3_get_sb,
3044 .kill_sb = kill_block_super,
3045 .fs_flags = FS_REQUIRES_DEV,
3046};
3047
3048static int __init init_ext3_fs(void)
3049{
3050 int err = init_ext3_xattr();
3051 if (err)
3052 return err;
3053 err = init_inodecache();
3054 if (err)
3055 goto out1;
3056 err = register_filesystem(&ext3_fs_type);
3057 if (err)
3058 goto out;
3059 return 0;
3060out:
3061 destroy_inodecache();
3062out1:
e9ad5620 3063 exit_ext3_xattr();
1da177e4
LT		 3064 return err;
3065}
3066
3067static void __exit exit_ext3_fs(void)
3068{
3069 unregister_filesystem(&ext3_fs_type);
3070 destroy_inodecache();
3071 exit_ext3_xattr();
3072}
3073
3074MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3075MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3076MODULE_LICENSE("GPL");
3077module_init(init_ext3_fs)
3078module_exit(exit_ext3_fs)
Linux kernel - Deliverables
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