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[net-next-2.6.git] / fs / ext3 / super.c
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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
167 * the journal instead. On recovery, the journal will compain about
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
184 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
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;
299 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_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
6cfd0148
CH		 413 lock_kernel();
414
1da177e4 415 ext3_xattr_put_super(sb);
44d6f787
HK		 416 err = journal_destroy(sbi->s_journal);
417 sbi->s_journal = NULL;
418 if (err < 0)
2d7c820e 419 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 420
1da177e4
LT		 421 if (!(sb->s_flags & MS_RDONLY)) {
422 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
423 es->s_state = cpu_to_le16(sbi->s_mount_state);
424 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
425 mark_buffer_dirty(sbi->s_sbh);
426 ext3_commit_super(sb, es, 1);
427 }
428
429 for (i = 0; i < sbi->s_gdb_count; i++)
430 brelse(sbi->s_group_desc[i]);
431 kfree(sbi->s_group_desc);
432 percpu_counter_destroy(&sbi->s_freeblocks_counter);
433 percpu_counter_destroy(&sbi->s_freeinodes_counter);
434 percpu_counter_destroy(&sbi->s_dirs_counter);
435 brelse(sbi->s_sbh);
436#ifdef CONFIG_QUOTA
437 for (i = 0; i < MAXQUOTAS; i++)
438 kfree(sbi->s_qf_names[i]);
439#endif
440
441 /* Debugging code just in case the in-memory inode orphan list
442 * isn't empty. The on-disk one can be non-empty if we've
443 * detected an error and taken the fs readonly, but the
444 * in-memory list had better be clean by this point. */
445 if (!list_empty(&sbi->s_orphan))
446 dump_orphan_list(sb, sbi);
447 J_ASSERT(list_empty(&sbi->s_orphan));
448
f98393a6 449 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 450 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
451 /*
452 * Invalidate the journal device's buffers. We don't want them
453 * floating about in memory - the physical journal device may
454 * hotswapped, and it breaks the `ro-after' testing code.
455 */
456 sync_blockdev(sbi->journal_bdev);
f98393a6 457 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 458 ext3_blkdev_remove(sbi);
459 }
460 sb->s_fs_info = NULL;
5df096d6 461 kfree(sbi->s_blockgroup_lock);
1da177e4 462 kfree(sbi);
6cfd0148
CH		 463
464 unlock_kernel();
1da177e4
LT		 465}
466
e18b890b 467static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 468
469/*
470 * Called inside transaction, so use GFP_NOFS
471 */
472static struct inode *ext3_alloc_inode(struct super_block *sb)
473{
474 struct ext3_inode_info *ei;
475
e6b4f8da 476 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 477 if (!ei)
478 return NULL;
1da177e4
LT		 479 ei->i_block_alloc_info = NULL;
480 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 481 atomic_set(&ei->i_datasync_tid, 0);
482 atomic_set(&ei->i_sync_tid, 0);
1da177e4
LT		 483 return &ei->vfs_inode;
484}
485
486static void ext3_destroy_inode(struct inode *inode)
487{
9f7dd93d
VA		 488 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
489 printk("EXT3 Inode %p: orphan list check failed!\n",
490 EXT3_I(inode));
491 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
492 EXT3_I(inode), sizeof(struct ext3_inode_info),
493 false);
494 dump_stack();
495 }
1da177e4
LT		 496 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
497}
498
51cc5068 499static void init_once(void *foo)
1da177e4
LT		 500{
501 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
502
a35afb83 503 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 504#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 505 init_rwsem(&ei->xattr_sem);
1da177e4 506#endif
a35afb83
CL		 507 mutex_init(&ei->truncate_mutex);
508 inode_init_once(&ei->vfs_inode);
1da177e4 509}
ae6ddcc5 510
1da177e4
LT		 511static int init_inodecache(void)
512{
513 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
514 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 515 0, (SLAB_RECLAIM_ACCOUNT|
516 SLAB_MEM_SPREAD),
20c2df83 517 init_once);
1da177e4
LT		 518 if (ext3_inode_cachep == NULL)
519 return -ENOMEM;
520 return 0;
521}
522
523static void destroy_inodecache(void)
524{
1a1d92c1 525 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 526}
527
528static void ext3_clear_inode(struct inode *inode)
529{
530 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
1da177e4
LT		 531 ext3_discard_reservation(inode);
532 EXT3_I(inode)->i_block_alloc_info = NULL;
e6022603
AM		 533 if (unlikely(rsv))
534 kfree(rsv);
1da177e4
LT		 535}
536
6cd37cda 537static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 538{
6cd37cda 539#if defined(CONFIG_QUOTA)
275abf5b 540 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 541
1aeec434
JK		 542 if (sbi->s_jquota_fmt) {
543 char *fmtname = "";
544
545 switch (sbi->s_jquota_fmt) {
546 case QFMT_VFS_OLD:
547 fmtname = "vfsold";
548 break;
549 case QFMT_VFS_V0:
550 fmtname = "vfsv0";
551 break;
552 case QFMT_VFS_V1:
553 fmtname = "vfsv1";
554 break;
555 }
556 seq_printf(seq, ",jqfmt=%s", fmtname);
557 }
8fc2751b
MB		 558
559 if (sbi->s_qf_names[USRQUOTA])
560 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
561
562 if (sbi->s_qf_names[GRPQUOTA])
563 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
564
565 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
566 seq_puts(seq, ",usrquota");
567
568 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
569 seq_puts(seq, ",grpquota");
570#endif
6cd37cda
PO		 571}
572
3c4cec65
JK		 573static char *data_mode_string(unsigned long mode)
574{
575 switch (mode) {
576 case EXT3_MOUNT_JOURNAL_DATA:
577 return "journal";
578 case EXT3_MOUNT_ORDERED_DATA:
579 return "ordered";
580 case EXT3_MOUNT_WRITEBACK_DATA:
581 return "writeback";
582 }
583 return "unknown";
584}
585
571beed8
MS		 586/*
587 * Show an option if
588 * - it's set to a non-default value OR
589 * - if the per-sb default is different from the global default
590 */
6cd37cda
PO		 591static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
592{
593 struct super_block *sb = vfs->mnt_sb;
571beed8
MS		 594 struct ext3_sb_info *sbi = EXT3_SB(sb);
595 struct ext3_super_block *es = sbi->s_es;
596 unsigned long def_mount_opts;
597
598 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
599
600 if (sbi->s_sb_block != 1)
601 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
602 if (test_opt(sb, MINIX_DF))
603 seq_puts(seq, ",minixdf");
604 if (test_opt(sb, GRPID))
605 seq_puts(seq, ",grpid");
606 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
607 seq_puts(seq, ",nogrpid");
608 if (sbi->s_resuid != EXT3_DEF_RESUID ||
609 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
610 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
611 }
612 if (sbi->s_resgid != EXT3_DEF_RESGID ||
613 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
614 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
615 }
1eca93f9 616 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 617 int def_errors = le16_to_cpu(es->s_errors);
618
619 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 620 def_errors == EXT3_ERRORS_CONTINUE) {
621 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 622 }
623 }
1eca93f9
AK		 624 if (test_opt(sb, ERRORS_CONT))
625 seq_puts(seq, ",errors=continue");
571beed8
MS		 626 if (test_opt(sb, ERRORS_PANIC))
627 seq_puts(seq, ",errors=panic");
628 if (test_opt(sb, NO_UID32))
629 seq_puts(seq, ",nouid32");
630 if (test_opt(sb, DEBUG))
631 seq_puts(seq, ",debug");
632 if (test_opt(sb, OLDALLOC))
633 seq_puts(seq, ",oldalloc");
634#ifdef CONFIG_EXT3_FS_XATTR
635 if (test_opt(sb, XATTR_USER))
636 seq_puts(seq, ",user_xattr");
637 if (!test_opt(sb, XATTR_USER) &&
638 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
639 seq_puts(seq, ",nouser_xattr");
640 }
641#endif
642#ifdef CONFIG_EXT3_FS_POSIX_ACL
643 if (test_opt(sb, POSIX_ACL))
644 seq_puts(seq, ",acl");
645 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
646 seq_puts(seq, ",noacl");
647#endif
648 if (!test_opt(sb, RESERVATION))
649 seq_puts(seq, ",noreservation");
650 if (sbi->s_commit_interval) {
651 seq_printf(seq, ",commit=%u",
652 (unsigned) (sbi->s_commit_interval / HZ));
653 }
654 if (test_opt(sb, BARRIER))
655 seq_puts(seq, ",barrier=1");
656 if (test_opt(sb, NOBH))
657 seq_puts(seq, ",nobh");
6cd37cda 658
3c4cec65
JK		 659 seq_printf(seq, ",data=%s", data_mode_string(sbi->s_mount_opt &
660 EXT3_MOUNT_DATA_FLAGS));
0e4fb5e2
HK		 661 if (test_opt(sb, DATA_ERR_ABORT))
662 seq_puts(seq, ",data_err=abort");
663
dee1d3b6
ES		 664 if (test_opt(sb, NOLOAD))
665 seq_puts(seq, ",norecovery");
666
6cd37cda 667 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 668
669 return 0;
670}
1da177e4 671
fdb36673 672
74af0baa
CH		 673static struct inode *ext3_nfs_get_inode(struct super_block *sb,
674 u64 ino, u32 generation)
fdb36673 675{
fdb36673 676 struct inode *inode;
fdb36673
N		 677
678 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
679 return ERR_PTR(-ESTALE);
680 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
681 return ERR_PTR(-ESTALE);
682
683 /* iget isn't really right if the inode is currently unallocated!!
684 *
685 * ext3_read_inode will return a bad_inode if the inode had been
686 * deleted, so we should be safe.
687 *
688 * Currently we don't know the generation for parent directory, so
689 * a generation of 0 means "accept any"
690 */
473043dc
DH		 691 inode = ext3_iget(sb, ino);
692 if (IS_ERR(inode))
693 return ERR_CAST(inode);
694 if (generation && inode->i_generation != generation) {
fdb36673
N		 695 iput(inode);
696 return ERR_PTR(-ESTALE);
697 }
74af0baa
CH		 698
699 return inode;
700}
701
702static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
703 int fh_len, int fh_type)
704{
705 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
706 ext3_nfs_get_inode);
707}
708
709static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
710 int fh_len, int fh_type)
711{
712 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
713 ext3_nfs_get_inode);
fdb36673
N		 714}
715
6b082b53
TO		 716/*
717 * Try to release metadata pages (indirect blocks, directories) which are
718 * mapped via the block device. Since these pages could have journal heads
719 * which would prevent try_to_free_buffers() from freeing them, we must use
720 * jbd layer's try_to_free_buffers() function to release them.
721 */
722static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
723 gfp_t wait)
724{
725 journal_t *journal = EXT3_SB(sb)->s_journal;
726
727 WARN_ON(PageChecked(page));
728 if (!page_has_buffers(page))
729 return 0;
730 if (journal)
731 return journal_try_to_free_buffers(journal, page,
732 wait & ~__GFP_WAIT);
733 return try_to_free_buffers(page);
734}
735
8fc2751b 736#ifdef CONFIG_QUOTA
1da177e4
LT		 737#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
738#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
739
1da177e4
LT		 740static int ext3_write_dquot(struct dquot *dquot);
741static int ext3_acquire_dquot(struct dquot *dquot);
742static int ext3_release_dquot(struct dquot *dquot);
743static int ext3_mark_dquot_dirty(struct dquot *dquot);
744static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f
JK		 745static int ext3_quota_on(struct super_block *sb, int type, int format_id,
746 char *path, int remount);
1da177e4
LT		 747static int ext3_quota_on_mount(struct super_block *sb, int type);
748static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
749 size_t len, loff_t off);
750static ssize_t ext3_quota_write(struct super_block *sb, int type,
751 const char *data, size_t len, loff_t off);
752
61e225dc 753static const struct dquot_operations ext3_quota_operations = {
a219ce37
JK		 754 .initialize = dquot_initialize,
755 .drop = dquot_drop,
1da177e4
LT		 756 .alloc_space = dquot_alloc_space,
757 .alloc_inode = dquot_alloc_inode,
758 .free_space = dquot_free_space,
759 .free_inode = dquot_free_inode,
760 .transfer = dquot_transfer,
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
LT		 771 .quota_on = ext3_quota_on,
772 .quota_off = vfs_quota_off,
773 .quota_sync = vfs_quota_sync,
774 .get_info = vfs_get_dqinfo,
775 .set_info = vfs_set_dqinfo,
776 .get_dqblk = vfs_get_dqblk,
777 .set_dqblk = vfs_set_dqblk
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
JK		 818 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
819 Opt_noquota, Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
820 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"},
1da177e4 874 {Opt_resize, "resize"},
92587216 875 {Opt_err, NULL},
1da177e4
LT		 876};
877
4cf46b67 878static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 879{
e9ad5620
DK		 880 ext3_fsblk_t sb_block;
881 char *options = (char *) *data;
1da177e4
LT		 882
883 if (!options || strncmp(options, "sb=", 3) != 0)
884 return 1; /* Default location */
885 options += 3;
43d23f90 886 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 887 sb_block = simple_strtoul(options, &options, 0);
888 if (*options && *options != ',') {
4cf46b67 889 ext3_msg(sb, "error: invalid sb specification: %s",
1da177e4
LT		 890 (char *) *data);
891 return 1;
892 }
893 if (*options == ',')
894 options++;
895 *data = (void *) options;
896 return sb_block;
897}
898
71b96257 899static int parse_options (char *options, struct super_block *sb,
eee194e7 900 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 901 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 902{
903 struct ext3_sb_info *sbi = EXT3_SB(sb);
904 char * p;
905 substring_t args[MAX_OPT_ARGS];
906 int data_opt = 0;
907 int option;
908#ifdef CONFIG_QUOTA
d06bf1d2 909 int qtype, qfmt;
1da177e4
LT		 910 char *qname;
911#endif
912
913 if (!options)
914 return 1;
915
916 while ((p = strsep (&options, ",")) != NULL) {
917 int token;
918 if (!*p)
919 continue;
920
921 token = match_token(p, tokens, args);
922 switch (token) {
923 case Opt_bsd_df:
924 clear_opt (sbi->s_mount_opt, MINIX_DF);
925 break;
926 case Opt_minix_df:
927 set_opt (sbi->s_mount_opt, MINIX_DF);
928 break;
929 case Opt_grpid:
930 set_opt (sbi->s_mount_opt, GRPID);
931 break;
932 case Opt_nogrpid:
933 clear_opt (sbi->s_mount_opt, GRPID);
934 break;
935 case Opt_resuid:
936 if (match_int(&args[0], &option))
937 return 0;
938 sbi->s_resuid = option;
939 break;
940 case Opt_resgid:
941 if (match_int(&args[0], &option))
942 return 0;
943 sbi->s_resgid = option;
944 break;
945 case Opt_sb:
946 /* handled by get_sb_block() instead of here */
947 /* *sb_block = match_int(&args[0]); */
948 break;
949 case Opt_err_panic:
950 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
951 clear_opt (sbi->s_mount_opt, ERRORS_RO);
952 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
953 break;
954 case Opt_err_ro:
955 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
956 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
957 set_opt (sbi->s_mount_opt, ERRORS_RO);
958 break;
959 case Opt_err_cont:
960 clear_opt (sbi->s_mount_opt, ERRORS_RO);
961 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
962 set_opt (sbi->s_mount_opt, ERRORS_CONT);
963 break;
964 case Opt_nouid32:
965 set_opt (sbi->s_mount_opt, NO_UID32);
966 break;
1da177e4
LT		 967 case Opt_nocheck:
968 clear_opt (sbi->s_mount_opt, CHECK);
969 break;
970 case Opt_debug:
971 set_opt (sbi->s_mount_opt, DEBUG);
972 break;
973 case Opt_oldalloc:
974 set_opt (sbi->s_mount_opt, OLDALLOC);
975 break;
976 case Opt_orlov:
977 clear_opt (sbi->s_mount_opt, OLDALLOC);
978 break;
979#ifdef CONFIG_EXT3_FS_XATTR
980 case Opt_user_xattr:
981 set_opt (sbi->s_mount_opt, XATTR_USER);
982 break;
983 case Opt_nouser_xattr:
984 clear_opt (sbi->s_mount_opt, XATTR_USER);
985 break;
986#else
987 case Opt_user_xattr:
988 case Opt_nouser_xattr:
4cf46b67
AF		 989 ext3_msg(sb, KERN_INFO,
990 "(no)user_xattr options not supported");
1da177e4
LT		 991 break;
992#endif
993#ifdef CONFIG_EXT3_FS_POSIX_ACL
994 case Opt_acl:
995 set_opt(sbi->s_mount_opt, POSIX_ACL);
996 break;
997 case Opt_noacl:
998 clear_opt(sbi->s_mount_opt, POSIX_ACL);
999 break;
1000#else
1001 case Opt_acl:
1002 case Opt_noacl:
4cf46b67
AF		 1003 ext3_msg(sb, KERN_INFO,
1004 "(no)acl options not supported");
1da177e4
LT		 1005 break;
1006#endif
1007 case Opt_reservation:
1008 set_opt(sbi->s_mount_opt, RESERVATION);
1009 break;
1010 case Opt_noreservation:
1011 clear_opt(sbi->s_mount_opt, RESERVATION);
1012 break;
1013 case Opt_journal_update:
1014 /* @@@ FIXME */
1015 /* Eventually we will want to be able to create
1016 a journal file here. For now, only allow the
1017 user to specify an existing inode to be the
1018 journal file. */
1019 if (is_remount) {
4cf46b67
AF		 1020 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1021 "journal on remount");
1da177e4
LT		 1022 return 0;
1023 }
1024 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1025 break;
1026 case Opt_journal_inum:
1027 if (is_remount) {
4cf46b67
AF		 1028 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1029 "journal on remount");
1da177e4
LT		 1030 return 0;
1031 }
1032 if (match_int(&args[0], &option))
1033 return 0;
1034 *inum = option;
1035 break;
71b96257
JL		 1036 case Opt_journal_dev:
1037 if (is_remount) {
4cf46b67
AF		 1038 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1039 "journal on remount");
71b96257
JL		 1040 return 0;
1041 }
1042 if (match_int(&args[0], &option))
1043 return 0;
1044 *journal_devnum = option;
1045 break;
1da177e4
LT		 1046 case Opt_noload:
1047 set_opt (sbi->s_mount_opt, NOLOAD);
1048 break;
1049 case Opt_commit:
1050 if (match_int(&args[0], &option))
1051 return 0;
1052 if (option < 0)
1053 return 0;
1054 if (option == 0)
1055 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1056 sbi->s_commit_interval = HZ * option;
1057 break;
1058 case Opt_data_journal:
1059 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1060 goto datacheck;
1061 case Opt_data_ordered:
1062 data_opt = EXT3_MOUNT_ORDERED_DATA;
1063 goto datacheck;
1064 case Opt_data_writeback:
1065 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1066 datacheck:
1067 if (is_remount) {
1068 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
3c4cec65
JK		 1069 == data_opt)
1070 break;
4cf46b67
AF		 1071 ext3_msg(sb, KERN_ERR,
1072 "error: cannot change "
3c4cec65
JK		 1073 "data mode on remount. The filesystem "
1074 "is mounted in data=%s mode and you "
4cf46b67 1075 "try to remount it in data=%s mode.",
3c4cec65
JK		 1076 data_mode_string(sbi->s_mount_opt &
1077 EXT3_MOUNT_DATA_FLAGS),
1078 data_mode_string(data_opt));
1079 return 0;
1da177e4
LT		 1080 } else {
1081 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1082 sbi->s_mount_opt |= data_opt;
1083 }
1084 break;
0e4fb5e2
HK		 1085 case Opt_data_err_abort:
1086 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1087 break;
1088 case Opt_data_err_ignore:
1089 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1090 break;
1da177e4
LT		 1091#ifdef CONFIG_QUOTA
1092 case Opt_usrjquota:
1093 qtype = USRQUOTA;
1094 goto set_qf_name;
1095 case Opt_grpjquota:
1096 qtype = GRPQUOTA;
1097set_qf_name:
ee0d5ffe 1098 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1099 !sbi->s_qf_names[qtype]) {
4cf46b67
AF		 1100 ext3_msg(sb, KERN_ERR,
1101 "error: cannot change journaled "
1102 "quota options when quota turned on.");
1da177e4
LT		 1103 return 0;
1104 }
1105 qname = match_strdup(&args[0]);
1106 if (!qname) {
4cf46b67
AF		 1107 ext3_msg(sb, KERN_ERR,
1108 "error: not enough memory for "
1109 "storing quotafile name.");
1da177e4
LT		 1110 return 0;
1111 }
1112 if (sbi->s_qf_names[qtype] &&
1113 strcmp(sbi->s_qf_names[qtype], qname)) {
4cf46b67
AF		 1114 ext3_msg(sb, KERN_ERR,
1115 "error: %s quota file already "
1116 "specified.", QTYPE2NAME(qtype));
1da177e4
LT		 1117 kfree(qname);
1118 return 0;
1119 }
1120 sbi->s_qf_names[qtype] = qname;
1121 if (strchr(sbi->s_qf_names[qtype], '/')) {
4cf46b67
AF		 1122 ext3_msg(sb, KERN_ERR,
1123 "error: quotafile must be on "
1124 "filesystem root.");
1da177e4
LT		 1125 kfree(sbi->s_qf_names[qtype]);
1126 sbi->s_qf_names[qtype] = NULL;
1127 return 0;
1128 }
1f54587b 1129 set_opt(sbi->s_mount_opt, QUOTA);
1da177e4
LT		 1130 break;
1131 case Opt_offusrjquota:
1132 qtype = USRQUOTA;
1133 goto clear_qf_name;
1134 case Opt_offgrpjquota:
1135 qtype = GRPQUOTA;
1136clear_qf_name:
ee0d5ffe 1137 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1138 sbi->s_qf_names[qtype]) {
4cf46b67 1139 ext3_msg(sb, KERN_ERR, "error: cannot change "
99aeaf63 1140 "journaled quota options when "
4cf46b67 1141 "quota turned on.");
1da177e4
LT		 1142 return 0;
1143 }
08c6a96f
JK		 1144 /*
1145 * The space will be released later when all options
1146 * are confirmed to be correct
1147 */
1da177e4
LT		 1148 sbi->s_qf_names[qtype] = NULL;
1149 break;
1150 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1151 qfmt = QFMT_VFS_OLD;
1152 goto set_qf_format;
1da177e4 1153 case Opt_jqfmt_vfsv0:
d06bf1d2 1154 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1155 goto set_qf_format;
1156 case Opt_jqfmt_vfsv1:
1157 qfmt = QFMT_VFS_V1;
d06bf1d2 1158set_qf_format:
ee0d5ffe 1159 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1160 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1161 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1162 "journaled quota options when "
4cf46b67 1163 "quota turned on.");
d06bf1d2
JK		 1164 return 0;
1165 }
1166 sbi->s_jquota_fmt = qfmt;
1da177e4 1167 break;
1f54587b 1168 case Opt_quota:
8fc2751b
MB		 1169 case Opt_usrquota:
1170 set_opt(sbi->s_mount_opt, QUOTA);
1171 set_opt(sbi->s_mount_opt, USRQUOTA);
1172 break;
1173 case Opt_grpquota:
1f54587b 1174 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1175 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1176 break;
1177 case Opt_noquota:
ee0d5ffe 1178 if (sb_any_quota_loaded(sb)) {
4cf46b67
AF		 1179 ext3_msg(sb, KERN_ERR, "error: cannot change "
1180 "quota options when quota turned on.");
1f54587b
JK		 1181 return 0;
1182 }
1183 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1184 clear_opt(sbi->s_mount_opt, USRQUOTA);
1185 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1186 break;
1da177e4 1187#else
8fc2751b
MB		 1188 case Opt_quota:
1189 case Opt_usrquota:
1190 case Opt_grpquota:
4cf46b67
AF		 1191 ext3_msg(sb, KERN_ERR,
1192 "error: quota options not supported.");
fa1ff1e0 1193 break;
1da177e4
LT		 1194 case Opt_usrjquota:
1195 case Opt_grpjquota:
1196 case Opt_offusrjquota:
1197 case Opt_offgrpjquota:
1198 case Opt_jqfmt_vfsold:
1199 case Opt_jqfmt_vfsv0:
1aeec434 1200 case Opt_jqfmt_vfsv1:
4cf46b67
AF		 1201 ext3_msg(sb, KERN_ERR,
1202 "error: journaled quota options not "
1203 "supported.");
1da177e4 1204 break;
1f54587b
JK		 1205 case Opt_noquota:
1206 break;
1da177e4
LT		 1207#endif
1208 case Opt_abort:
1209 set_opt(sbi->s_mount_opt, ABORT);
1210 break;
1211 case Opt_barrier:
1212 if (match_int(&args[0], &option))
1213 return 0;
1214 if (option)
1215 set_opt(sbi->s_mount_opt, BARRIER);
1216 else
1217 clear_opt(sbi->s_mount_opt, BARRIER);
1218 break;
1219 case Opt_ignore:
1220 break;
1221 case Opt_resize:
08c6a96f 1222 if (!is_remount) {
4cf46b67
AF		 1223 ext3_msg(sb, KERN_ERR,
1224 "error: resize option only available "
1225 "for remount");
1da177e4
LT		 1226 return 0;
1227 }
c7f1721e
KZ		 1228 if (match_int(&args[0], &option) != 0)
1229 return 0;
1da177e4
LT		 1230 *n_blocks_count = option;
1231 break;
1232 case Opt_nobh:
1233 set_opt(sbi->s_mount_opt, NOBH);
1234 break;
ade1a29e
BP		 1235 case Opt_bh:
1236 clear_opt(sbi->s_mount_opt, NOBH);
1237 break;
1da177e4 1238 default:
4cf46b67
AF		 1239 ext3_msg(sb, KERN_ERR,
1240 "error: unrecognized mount option \"%s\" "
1241 "or missing value", p);
1da177e4
LT		 1242 return 0;
1243 }
1244 }
1245#ifdef CONFIG_QUOTA
8fc2751b
MB		 1246 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1247 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1248 sbi->s_qf_names[USRQUOTA])
1249 clear_opt(sbi->s_mount_opt, USRQUOTA);
1250
1251 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1252 sbi->s_qf_names[GRPQUOTA])
1253 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1254
1255 if ((sbi->s_qf_names[USRQUOTA] &&
1256 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1257 (sbi->s_qf_names[GRPQUOTA] &&
1258 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
4cf46b67
AF		 1259 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1260 "format mixing.");
8fc2751b
MB		 1261 return 0;
1262 }
1263
1264 if (!sbi->s_jquota_fmt) {
4cf46b67
AF		 1265 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1266 "not specified.");
8fc2751b
MB		 1267 return 0;
1268 }
1269 } else {
1270 if (sbi->s_jquota_fmt) {
4cf46b67 1271 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
99aeaf63 1272 "specified with no journaling "
4cf46b67 1273 "enabled.");
8fc2751b
MB		 1274 return 0;
1275 }
1da177e4
LT		 1276 }
1277#endif
1da177e4
LT		 1278 return 1;
1279}
1280
1281static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1282 int read_only)
1283{
1284 struct ext3_sb_info *sbi = EXT3_SB(sb);
1285 int res = 0;
1286
1287 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
AF		 1288 ext3_msg(sb, KERN_ERR,
1289 "error: revision level too high, "
1290 "forcing read-only mode");
1da177e4
LT		 1291 res = MS_RDONLY;
1292 }
1293 if (read_only)
1294 return res;
1295 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
AF		 1296 ext3_msg(sb, KERN_WARNING,
1297 "warning: mounting unchecked fs, "
1298 "running e2fsck is recommended");
1da177e4 1299 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
AF		 1300 ext3_msg(sb, KERN_WARNING,
1301 "warning: mounting fs with errors, "
1302 "running e2fsck is recommended");
1da177e4
LT		 1303 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1304 le16_to_cpu(es->s_mnt_count) >=
1305 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
4cf46b67
AF		 1306 ext3_msg(sb, KERN_WARNING,
1307 "warning: maximal mount count reached, "
1308 "running e2fsck is recommended");
1da177e4
LT		 1309 else if (le32_to_cpu(es->s_checkinterval) &&
1310 (le32_to_cpu(es->s_lastcheck) +
1311 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
AF		 1312 ext3_msg(sb, KERN_WARNING,
1313 "warning: checktime reached, "
1314 "running e2fsck is recommended");
1da177e4
LT		 1315#if 0
1316 /* @@@ We _will_ want to clear the valid bit if we find
1317 inconsistencies, to force a fsck at reboot. But for
1318 a plain journaled filesystem we can keep it set as
1319 valid forever! :) */
e7f23ebd 1320 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4
LT		 1321#endif
1322 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1323 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1324 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1325 es->s_mtime = cpu_to_le32(get_seconds());
1326 ext3_update_dynamic_rev(sb);
1327 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1328
1329 ext3_commit_super(sb, es, 1);
1330 if (test_opt(sb, DEBUG))
4cf46b67
AF		 1331 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1332 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1333 sb->s_blocksize,
1334 sbi->s_groups_count,
1335 EXT3_BLOCKS_PER_GROUP(sb),
1336 EXT3_INODES_PER_GROUP(sb),
1337 sbi->s_mount_opt);
1338
1da177e4
LT		 1339 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1340 char b[BDEVNAME_SIZE];
4cf46b67 1341 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1342 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1343 } else {
4cf46b67 1344 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1345 }
1da177e4
LT		 1346 return res;
1347}
1348
1349/* Called at mount-time, super-block is locked */
197cd65a 1350static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1351{
1352 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1353 int i;
1354
1355 ext3_debug ("Checking group descriptors");
1356
197cd65a
AM		 1357 for (i = 0; i < sbi->s_groups_count; i++) {
1358 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1359 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1360 ext3_fsblk_t last_block;
197cd65a 1361
855565e8
ES		 1362 if (i == sbi->s_groups_count - 1)
1363 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1364 else
1365 last_block = first_block +
1366 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1367
855565e8
ES		 1368 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1369 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1370 {
1371 ext3_error (sb, "ext3_check_descriptors",
1372 "Block bitmap for group %d"
1373 " not in group (block %lu)!",
1374 i, (unsigned long)
1375 le32_to_cpu(gdp->bg_block_bitmap));
1376 return 0;
1377 }
855565e8
ES		 1378 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1379 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1380 {
1381 ext3_error (sb, "ext3_check_descriptors",
1382 "Inode bitmap for group %d"
1383 " not in group (block %lu)!",
1384 i, (unsigned long)
1385 le32_to_cpu(gdp->bg_inode_bitmap));
1386 return 0;
1387 }
855565e8 1388 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1389 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1390 last_block)
1da177e4
LT		 1391 {
1392 ext3_error (sb, "ext3_check_descriptors",
1393 "Inode table for group %d"
1394 " not in group (block %lu)!",
1395 i, (unsigned long)
1396 le32_to_cpu(gdp->bg_inode_table));
1397 return 0;
1398 }
1da177e4
LT		 1399 }
1400
1401 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1402 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1403 return 1;
1404}
1405
1406
1407/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1408 * the superblock) which were deleted from all directories, but held open by
1409 * a process at the time of a crash. We walk the list and try to delete these
1410 * inodes at recovery time (only with a read-write filesystem).
1411 *
1412 * In order to keep the orphan inode chain consistent during traversal (in
1413 * case of crash during recovery), we link each inode into the superblock
1414 * orphan list_head and handle it the same way as an inode deletion during
1415 * normal operation (which journals the operations for us).
1416 *
1417 * We only do an iget() and an iput() on each inode, which is very safe if we
1418 * accidentally point at an in-use or already deleted inode. The worst that
1419 * can happen in this case is that we get a "bit already cleared" message from
1420 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1421 * e2fsck was run on this filesystem, and it must have already done the orphan
1422 * inode cleanup for us, so we can safely abort without any further action.
1423 */
1424static void ext3_orphan_cleanup (struct super_block * sb,
1425 struct ext3_super_block * es)
1426{
1427 unsigned int s_flags = sb->s_flags;
1428 int nr_orphans = 0, nr_truncates = 0;
1429#ifdef CONFIG_QUOTA
1430 int i;
1431#endif
1432 if (!es->s_last_orphan) {
1433 jbd_debug(4, "no orphan inodes to clean up\n");
1434 return;
1435 }
1436
a8f48a95 1437 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
AF		 1438 ext3_msg(sb, KERN_ERR, "error: write access "
1439 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1440 return;
1441 }
1442
1da177e4
LT		 1443 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1444 if (es->s_last_orphan)
1445 jbd_debug(1, "Errors on filesystem, "
1446 "clearing orphan list.\n");
1447 es->s_last_orphan = 0;
1448 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1449 return;
1450 }
1451
1452 if (s_flags & MS_RDONLY) {
4cf46b67 1453 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1454 sb->s_flags &= ~MS_RDONLY;
1455 }
1456#ifdef CONFIG_QUOTA
1457 /* Needed for iput() to work correctly and not trash data */
1458 sb->s_flags |= MS_ACTIVE;
1459 /* Turn on quotas so that they are updated correctly */
1460 for (i = 0; i < MAXQUOTAS; i++) {
1461 if (EXT3_SB(sb)->s_qf_names[i]) {
1462 int ret = ext3_quota_on_mount(sb, i);
1463 if (ret < 0)
4cf46b67
AF		 1464 ext3_msg(sb, KERN_ERR,
1465 "error: cannot turn on journaled "
1466 "quota: %d", ret);
1da177e4
LT		 1467 }
1468 }
1469#endif
1470
1471 while (es->s_last_orphan) {
1472 struct inode *inode;
1473
473043dc
DH		 1474 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1475 if (IS_ERR(inode)) {
1da177e4
LT		 1476 es->s_last_orphan = 0;
1477 break;
1478 }
1479
1480 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
81a05227 1481 vfs_dq_init(inode);
1da177e4
LT		 1482 if (inode->i_nlink) {
1483 printk(KERN_DEBUG
eee194e7 1484 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1485 __func__, inode->i_ino, inode->i_size);
eee194e7 1486 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1487 inode->i_ino, inode->i_size);
1488 ext3_truncate(inode);
1489 nr_truncates++;
1490 } else {
1491 printk(KERN_DEBUG
eee194e7 1492 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1493 __func__, inode->i_ino);
eee194e7 1494 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1495 inode->i_ino);
1496 nr_orphans++;
1497 }
1498 iput(inode); /* The delete magic happens here! */
1499 }
1500
1501#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1502
1503 if (nr_orphans)
4cf46b67
AF		 1504 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1505 PLURAL(nr_orphans));
1da177e4 1506 if (nr_truncates)
4cf46b67
AF		 1507 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1508 PLURAL(nr_truncates));
1da177e4
LT		 1509#ifdef CONFIG_QUOTA
1510 /* Turn quotas off */
1511 for (i = 0; i < MAXQUOTAS; i++) {
1512 if (sb_dqopt(sb)->files[i])
2fd83a4f 1513 vfs_quota_off(sb, i, 0);
1da177e4
LT		 1514 }
1515#endif
1516 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1517}
1518
1da177e4
LT		 1519/*
1520 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1521 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1522 * We need to be 1 filesystem block less than the 2^32 sector limit.
1523 */
1524static loff_t ext3_max_size(int bits)
1525{
1526 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1527 int meta_blocks;
1528 loff_t upper_limit;
1529
1530 /* This is calculated to be the largest file size for a
1531 * dense, file such that the total number of
1da177e4 1532 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1533 * does not exceed 2^32 -1
1534 * __u32 i_blocks representing the total number of
1535 * 512 bytes blocks of the file
1536 */
1537 upper_limit = (1LL << 32) - 1;
1538
1539 /* total blocks in file system block size */
1540 upper_limit >>= (bits - 9);
1541
1542
1543 /* indirect blocks */
1544 meta_blocks = 1;
1545 /* double indirect blocks */
1546 meta_blocks += 1 + (1LL << (bits-2));
1547 /* tripple indirect blocks */
1548 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1549
1550 upper_limit -= meta_blocks;
1551 upper_limit <<= bits;
1da177e4
LT		 1552
1553 res += 1LL << (bits-2);
1554 res += 1LL << (2*(bits-2));
1555 res += 1LL << (3*(bits-2));
1556 res <<= bits;
1557 if (res > upper_limit)
1558 res = upper_limit;
fe7fdc37
AK		 1559
1560 if (res > MAX_LFS_FILESIZE)
1561 res = MAX_LFS_FILESIZE;
1562
1da177e4
LT		 1563 return res;
1564}
1565
43d23f90
MC		 1566static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1567 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1568 int nr)
1569{
1570 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1571 unsigned long bg, first_meta_bg;
1da177e4
LT		 1572 int has_super = 0;
1573
1da177e4
LT		 1574 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1575
1576 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1577 nr < first_meta_bg)
1578 return (logic_sb_block + nr + 1);
1579 bg = sbi->s_desc_per_block * nr;
1580 if (ext3_bg_has_super(sb, bg))
1581 has_super = 1;
43d23f90 1582 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1583}
1584
1585
1586static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1587{
1588 struct buffer_head * bh;
1589 struct ext3_super_block *es = NULL;
1590 struct ext3_sb_info *sbi;
43d23f90 1591 ext3_fsblk_t block;
4cf46b67 1592 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1593 ext3_fsblk_t logic_sb_block;
1da177e4 1594 unsigned long offset = 0;
eee194e7 1595 unsigned int journal_inum = 0;
71b96257 1596 unsigned long journal_devnum = 0;
1da177e4
LT		 1597 unsigned long def_mount_opts;
1598 struct inode *root;
1599 int blocksize;
1600 int hblock;
1601 int db_count;
1602 int i;
1603 int needs_recovery;
473043dc 1604 int ret = -EINVAL;
1da177e4 1605 __le32 features;
833f4077 1606 int err;
1da177e4 1607
f8314dc6 1608 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1609 if (!sbi)
1610 return -ENOMEM;
5df096d6
PE		 1611
1612 sbi->s_blockgroup_lock =
1613 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1614 if (!sbi->s_blockgroup_lock) {
1615 kfree(sbi);
1616 return -ENOMEM;
1617 }
1da177e4 1618 sb->s_fs_info = sbi;
1da177e4
LT		 1619 sbi->s_mount_opt = 0;
1620 sbi->s_resuid = EXT3_DEF_RESUID;
1621 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1622 sbi->s_sb_block = sb_block;
1da177e4
LT		 1623
1624 unlock_kernel();
1625
1626 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1627 if (!blocksize) {
4cf46b67 1628 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1629 goto out_fail;
1630 }
1631
1632 /*
1633 * The ext3 superblock will not be buffer aligned for other than 1kB
1634 * block sizes. We need to calculate the offset from buffer start.
1635 */
1636 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1637 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1638 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1639 } else {
1640 logic_sb_block = sb_block;
1641 }
1642
1643 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1644 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1645 goto out_fail;
1646 }
1647 /*
1648 * Note: s_es must be initialized as soon as possible because
1649 * some ext3 macro-instructions depend on its value
1650 */
1651 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1652 sbi->s_es = es;
1653 sb->s_magic = le16_to_cpu(es->s_magic);
1654 if (sb->s_magic != EXT3_SUPER_MAGIC)
1655 goto cantfind_ext3;
1656
1657 /* Set defaults before we parse the mount options */
1658 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1659 if (def_mount_opts & EXT3_DEFM_DEBUG)
1660 set_opt(sbi->s_mount_opt, DEBUG);
1661 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1662 set_opt(sbi->s_mount_opt, GRPID);
1663 if (def_mount_opts & EXT3_DEFM_UID16)
1664 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1665#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1666 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1667 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1668#endif
1669#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1670 if (def_mount_opts & EXT3_DEFM_ACL)
1671 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1672#endif
1da177e4
LT		 1673 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1674 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1675 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1676 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1677 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1678 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1679
1680 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1681 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1682 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1683 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1684 else
1685 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1686
1687 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1688 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1689
1690 set_opt(sbi->s_mount_opt, RESERVATION);
1691
71b96257
JL		 1692 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1693 NULL, 0))
1da177e4
LT		 1694 goto failed_mount;
1695
1696 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1697 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1698
1699 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1700 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1701 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1702 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
AF		 1703 ext3_msg(sb, KERN_WARNING,
1704 "warning: feature flags set on rev 0 fs, "
1705 "running e2fsck is recommended");
1da177e4
LT		 1706 /*
1707 * Check feature flags regardless of the revision level, since we
1708 * previously didn't change the revision level when setting the flags,
1709 * so there is a chance incompat flags are set on a rev 0 filesystem.
1710 */
1711 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1712 if (features) {
4cf46b67
AF		 1713 ext3_msg(sb, KERN_ERR,
1714 "error: couldn't mount because of unsupported "
1715 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1716 goto failed_mount;
1717 }
1718 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1719 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
AF		 1720 ext3_msg(sb, KERN_ERR,
1721 "error: couldn't mount RDWR because of unsupported "
1722 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1723 goto failed_mount;
1724 }
1725 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1726
1727 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1728 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
AF		 1729 ext3_msg(sb, KERN_ERR,
1730 "error: couldn't mount because of unsupported "
1731 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1732 goto failed_mount;
1733 }
1734
e1defc4f 1735 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1736 if (sb->s_blocksize != blocksize) {
1737 /*
1738 * Make sure the blocksize for the filesystem is larger
1739 * than the hardware sectorsize for the machine.
1740 */
1741 if (blocksize < hblock) {
4cf46b67
AF		 1742 ext3_msg(sb, KERN_ERR,
1743 "error: fsblocksize %d too small for "
1744 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1745 goto failed_mount;
1746 }
1747
1748 brelse (bh);
0f0a89eb 1749 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
AF		 1750 ext3_msg(sb, KERN_ERR,
1751 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1752 goto out_fail;
1753 }
1da177e4
LT		 1754 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1755 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1756 bh = sb_bread(sb, logic_sb_block);
1757 if (!bh) {
4cf46b67
AF		 1758 ext3_msg(sb, KERN_ERR,
1759 "error: can't read superblock on 2nd try");
1da177e4
LT		 1760 goto failed_mount;
1761 }
1762 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1763 sbi->s_es = es;
1764 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
AF		 1765 ext3_msg(sb, KERN_ERR,
1766 "error: magic mismatch");
1da177e4
LT		 1767 goto failed_mount;
1768 }
1769 }
1770
1771 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1772
1773 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1774 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1775 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1776 } else {
1777 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1778 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1779 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1780 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1781 (sbi->s_inode_size > blocksize)) {
4cf46b67
AF		 1782 ext3_msg(sb, KERN_ERR,
1783 "error: unsupported inode size: %d",
1da177e4
LT		 1784 sbi->s_inode_size);
1785 goto failed_mount;
1786 }
1787 }
1788 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1789 le32_to_cpu(es->s_log_frag_size);
1790 if (blocksize != sbi->s_frag_size) {
4cf46b67
AF		 1791 ext3_msg(sb, KERN_ERR,
1792 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1793 sbi->s_frag_size, blocksize);
1794 goto failed_mount;
1795 }
1796 sbi->s_frags_per_block = 1;
1797 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1798 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1799 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1800 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1801 goto cantfind_ext3;
1802 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1803 if (sbi->s_inodes_per_block == 0)
1804 goto cantfind_ext3;
1805 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1806 sbi->s_inodes_per_block;
1807 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1808 sbi->s_sbh = bh;
1809 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1810 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1811 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1812 for (i=0; i < 4; i++)
1813 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1814 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1815 i = le32_to_cpu(es->s_flags);
1816 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1817 sbi->s_hash_unsigned = 3;
1818 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1819#ifdef __CHAR_UNSIGNED__
1820 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1821 sbi->s_hash_unsigned = 3;
1822#else
1823 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1824#endif
5e1f8c9e 1825 }
1da177e4
LT		 1826
1827 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
AF		 1828 ext3_msg(sb, KERN_ERR,
1829 "#blocks per group too big: %lu",
1da177e4
LT		 1830 sbi->s_blocks_per_group);
1831 goto failed_mount;
1832 }
1833 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
AF		 1834 ext3_msg(sb, KERN_ERR,
1835 "error: #fragments per group too big: %lu",
1da177e4
LT		 1836 sbi->s_frags_per_group);
1837 goto failed_mount;
1838 }
1839 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
AF		 1840 ext3_msg(sb, KERN_ERR,
1841 "error: #inodes per group too big: %lu",
1da177e4
LT		 1842 sbi->s_inodes_per_group);
1843 goto failed_mount;
1844 }
1845
fcd5df35
MC		 1846 if (le32_to_cpu(es->s_blocks_count) >
1847 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
4cf46b67
AF		 1848 ext3_msg(sb, KERN_ERR,
1849 "error: filesystem is too large to mount safely");
fcd5df35 1850 if (sizeof(sector_t) < 8)
4cf46b67
AF		 1851 ext3_msg(sb, KERN_ERR,
1852 "error: CONFIG_LBDAF not enabled");
fcd5df35
MC		 1853 goto failed_mount;
1854 }
1855
1da177e4
LT		 1856 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1857 goto cantfind_ext3;
855565e8
ES		 1858 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1859 le32_to_cpu(es->s_first_data_block) - 1)
1860 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 1861 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1862 EXT3_DESC_PER_BLOCK(sb);
1863 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1864 GFP_KERNEL);
1865 if (sbi->s_group_desc == NULL) {
4cf46b67
AF		 1866 ext3_msg(sb, KERN_ERR,
1867 "error: not enough memory");
1da177e4
LT		 1868 goto failed_mount;
1869 }
1870
5df096d6 1871 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1872
1873 for (i = 0; i < db_count; i++) {
1874 block = descriptor_loc(sb, logic_sb_block, i);
1875 sbi->s_group_desc[i] = sb_bread(sb, block);
1876 if (!sbi->s_group_desc[i]) {
4cf46b67
AF		 1877 ext3_msg(sb, KERN_ERR,
1878 "error: can't read group descriptor %d", i);
1da177e4
LT		 1879 db_count = i;
1880 goto failed_mount2;
1881 }
1882 }
1883 if (!ext3_check_descriptors (sb)) {
4cf46b67
AF		 1884 ext3_msg(sb, KERN_ERR,
1885 "error: group descriptors corrupted");
1da177e4
LT		 1886 goto failed_mount2;
1887 }
1888 sbi->s_gdb_count = db_count;
1889 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1890 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1891
833f4077
PZ		 1892 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1893 ext3_count_free_blocks(sb));
1894 if (!err) {
1895 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1896 ext3_count_free_inodes(sb));
1897 }
1898 if (!err) {
1899 err = percpu_counter_init(&sbi->s_dirs_counter,
1900 ext3_count_dirs(sb));
1901 }
1902 if (err) {
4cf46b67 1903 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
833f4077
PZ		 1904 goto failed_mount3;
1905 }
0216bfcf 1906
1da177e4
LT		 1907 /* per fileystem reservation list head & lock */
1908 spin_lock_init(&sbi->s_rsv_window_lock);
1909 sbi->s_rsv_window_root = RB_ROOT;
1910 /* Add a single, static dummy reservation to the start of the
1911 * reservation window list --- it gives us a placeholder for
1912 * append-at-start-of-list which makes the allocation logic
1913 * _much_ simpler. */
1914 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1915 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1916 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1917 sbi->s_rsv_window_head.rsv_goal_size = 0;
1918 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1919
1920 /*
1921 * set up enough so that it can read an inode
1922 */
1923 sb->s_op = &ext3_sops;
1924 sb->s_export_op = &ext3_export_ops;
1925 sb->s_xattr = ext3_xattr_handlers;
1926#ifdef CONFIG_QUOTA
1927 sb->s_qcop = &ext3_qctl_operations;
1928 sb->dq_op = &ext3_quota_operations;
1929#endif
1930 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 1931 mutex_init(&sbi->s_orphan_lock);
96d2a495 1932 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 1933
1934 sb->s_root = NULL;
1935
1936 needs_recovery = (es->s_last_orphan != 0 ||
1937 EXT3_HAS_INCOMPAT_FEATURE(sb,
1938 EXT3_FEATURE_INCOMPAT_RECOVER));
1939
1940 /*
1941 * The first inode we look at is the journal inode. Don't try
1942 * root first: it may be modified in the journal!
1943 */
1944 if (!test_opt(sb, NOLOAD) &&
1945 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1946 if (ext3_load_journal(sb, es, journal_devnum))
0216bfcf 1947 goto failed_mount3;
1da177e4
LT		 1948 } else if (journal_inum) {
1949 if (ext3_create_journal(sb, es, journal_inum))
0216bfcf 1950 goto failed_mount3;
1da177e4
LT		 1951 } else {
1952 if (!silent)
4cf46b67
AF		 1953 ext3_msg(sb, KERN_ERR,
1954 "error: no journal found. "
1955 "mounting ext3 over ext2?");
0216bfcf 1956 goto failed_mount3;
1da177e4
LT		 1957 }
1958
1959 /* We have now updated the journal if required, so we can
1960 * validate the data journaling mode. */
1961 switch (test_opt(sb, DATA_FLAGS)) {
1962 case 0:
1963 /* No mode set, assume a default based on the journal
1964 capabilities: ORDERED_DATA if the journal can
1965 cope, else JOURNAL_DATA */
1966 if (journal_check_available_features
1967 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 1968 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 1969 else
1970 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1971 break;
1972
1973 case EXT3_MOUNT_ORDERED_DATA:
1974 case EXT3_MOUNT_WRITEBACK_DATA:
1975 if (!journal_check_available_features
1976 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
AF		 1977 ext3_msg(sb, KERN_ERR,
1978 "error: journal does not support "
1979 "requested data journaling mode");
0216bfcf 1980 goto failed_mount4;
1da177e4
LT		 1981 }
1982 default:
1983 break;
1984 }
1985
1986 if (test_opt(sb, NOBH)) {
1da177e4 1987 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
4cf46b67
AF		 1988 ext3_msg(sb, KERN_WARNING,
1989 "warning: ignoring nobh option - "
1990 "it is supported only with writeback mode");
1da177e4
LT		 1991 clear_opt(sbi->s_mount_opt, NOBH);
1992 }
1993 }
1994 /*
1995 * The journal_load will have done any necessary log recovery,
1996 * so we can safely mount the rest of the filesystem now.
1997 */
1998
473043dc
DH		 1999 root = ext3_iget(sb, EXT3_ROOT_INO);
2000 if (IS_ERR(root)) {
4cf46b67 2001 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 2002 ret = PTR_ERR(root);
0216bfcf 2003 goto failed_mount4;
1da177e4
LT		 2004 }
2005 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2006 iput(root);
4cf46b67 2007 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
0216bfcf 2008 goto failed_mount4;
1da177e4 2009 }
473043dc
DH		 2010 sb->s_root = d_alloc_root(root);
2011 if (!sb->s_root) {
4cf46b67 2012 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc
DH		 2013 iput(root);
2014 ret = -ENOMEM;
2015 goto failed_mount4;
2016 }
1da177e4
LT		 2017
2018 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ed505ee4 2019
1da177e4
LT		 2020 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2021 ext3_orphan_cleanup(sb, es);
2022 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2023 if (needs_recovery)
4cf46b67 2024 ext3_msg(sb, KERN_INFO, "recovery complete");
1da177e4 2025 ext3_mark_recovery_complete(sb, es);
4cf46b67 2026 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2027 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2028 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2029 "writeback");
2030
1da177e4
LT		 2031 lock_kernel();
2032 return 0;
2033
2034cantfind_ext3:
2035 if (!silent)
4cf46b67
AF		 2036 ext3_msg(sb, KERN_INFO,
2037 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2038 sb->s_id);
2039 goto failed_mount;
2040
0216bfcf 2041failed_mount4:
1da177e4 2042 journal_destroy(sbi->s_journal);
0216bfcf
MC		 2043failed_mount3:
2044 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2045 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2046 percpu_counter_destroy(&sbi->s_dirs_counter);
1da177e4
LT		 2047failed_mount2:
2048 for (i = 0; i < db_count; i++)
2049 brelse(sbi->s_group_desc[i]);
2050 kfree(sbi->s_group_desc);
2051failed_mount:
2052#ifdef CONFIG_QUOTA
2053 for (i = 0; i < MAXQUOTAS; i++)
2054 kfree(sbi->s_qf_names[i]);
2055#endif
2056 ext3_blkdev_remove(sbi);
2057 brelse(bh);
2058out_fail:
2059 sb->s_fs_info = NULL;
de5ce037 2060 kfree(sbi->s_blockgroup_lock);
1da177e4
LT		 2061 kfree(sbi);
2062 lock_kernel();
473043dc 2063 return ret;
1da177e4
LT		 2064}
2065
2066/*
2067 * Setup any per-fs journal parameters now. We'll do this both on
2068 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2069 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2070 */
2071static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2072{
2073 struct ext3_sb_info *sbi = EXT3_SB(sb);
2074
2075 if (sbi->s_commit_interval)
2076 journal->j_commit_interval = sbi->s_commit_interval;
2077 /* We could also set up an ext3-specific default for the commit
2078 * interval here, but for now we'll just fall back to the jbd
2079 * default. */
2080
2081 spin_lock(&journal->j_state_lock);
2082 if (test_opt(sb, BARRIER))
2083 journal->j_flags |= JFS_BARRIER;
2084 else
2085 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2086 if (test_opt(sb, DATA_ERR_ABORT))
2087 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2088 else
2089 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2090 spin_unlock(&journal->j_state_lock);
2091}
2092
eee194e7
ES		 2093static journal_t *ext3_get_journal(struct super_block *sb,
2094 unsigned int journal_inum)
1da177e4
LT		 2095{
2096 struct inode *journal_inode;
2097 journal_t *journal;
2098
2099 /* First, test for the existence of a valid inode on disk. Bad
2100 * things happen if we iget() an unused inode, as the subsequent
2101 * iput() will try to delete it. */
2102
473043dc
DH		 2103 journal_inode = ext3_iget(sb, journal_inum);
2104 if (IS_ERR(journal_inode)) {
4cf46b67 2105 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2106 return NULL;
2107 }
2108 if (!journal_inode->i_nlink) {
2109 make_bad_inode(journal_inode);
2110 iput(journal_inode);
4cf46b67 2111 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2112 return NULL;
2113 }
2114
2115 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2116 journal_inode, journal_inode->i_size);
473043dc 2117 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2118 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2119 iput(journal_inode);
2120 return NULL;
2121 }
2122
2123 journal = journal_init_inode(journal_inode);
2124 if (!journal) {
4cf46b67 2125 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2126 iput(journal_inode);
2127 return NULL;
2128 }
2129 journal->j_private = sb;
2130 ext3_init_journal_params(sb, journal);
2131 return journal;
2132}
2133
2134static journal_t *ext3_get_dev_journal(struct super_block *sb,
2135 dev_t j_dev)
2136{
2137 struct buffer_head * bh;
2138 journal_t *journal;
43d23f90 2139 ext3_fsblk_t start;
1c2bf374 2140 ext3_fsblk_t len;
1da177e4 2141 int hblock, blocksize;
43d23f90 2142 ext3_fsblk_t sb_block;
1da177e4
LT		 2143 unsigned long offset;
2144 struct ext3_super_block * es;
2145 struct block_device *bdev;
2146
4cf46b67 2147 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2148 if (bdev == NULL)
2149 return NULL;
2150
2151 if (bd_claim(bdev, sb)) {
4cf46b67
AF		 2152 ext3_msg(sb, KERN_ERR,
2153 "error: failed to claim external journal device");
9a1c3542 2154 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 2155 return NULL;
2156 }
2157
2158 blocksize = sb->s_blocksize;
e1defc4f 2159 hblock = bdev_logical_block_size(bdev);
1da177e4 2160 if (blocksize < hblock) {
4cf46b67
AF		 2161 ext3_msg(sb, KERN_ERR,
2162 "error: blocksize too small for journal device");
1da177e4
LT		 2163 goto out_bdev;
2164 }
2165
2166 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2167 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2168 set_blocksize(bdev, blocksize);
2169 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
AF		 2170 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2171 "external journal");
1da177e4
LT		 2172 goto out_bdev;
2173 }
2174
2175 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2176 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2177 !(le32_to_cpu(es->s_feature_incompat) &
2178 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
AF		 2179 ext3_msg(sb, KERN_ERR, "error: external journal has "
2180 "bad superblock");
1da177e4
LT		 2181 brelse(bh);
2182 goto out_bdev;
2183 }
2184
2185 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2186 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2187 brelse(bh);
2188 goto out_bdev;
2189 }
2190
2191 len = le32_to_cpu(es->s_blocks_count);
2192 start = sb_block + 1;
2193 brelse(bh); /* we're done with the superblock */
2194
2195 journal = journal_init_dev(bdev, sb->s_bdev,
2196 start, len, blocksize);
2197 if (!journal) {
4cf46b67
AF		 2198 ext3_msg(sb, KERN_ERR,
2199 "error: failed to create device journal");
1da177e4
LT		 2200 goto out_bdev;
2201 }
2202 journal->j_private = sb;
2203 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2204 wait_on_buffer(journal->j_sb_buffer);
2205 if (!buffer_uptodate(journal->j_sb_buffer)) {
4cf46b67 2206 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
1da177e4
LT		 2207 goto out_journal;
2208 }
2209 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
AF		 2210 ext3_msg(sb, KERN_ERR,
2211 "error: external journal has more than one "
2212 "user (unsupported) - %d",
1da177e4
LT		 2213 be32_to_cpu(journal->j_superblock->s_nr_users));
2214 goto out_journal;
2215 }
2216 EXT3_SB(sb)->journal_bdev = bdev;
2217 ext3_init_journal_params(sb, journal);
2218 return journal;
2219out_journal:
2220 journal_destroy(journal);
2221out_bdev:
2222 ext3_blkdev_put(bdev);
2223 return NULL;
2224}
2225
71b96257
JL		 2226static int ext3_load_journal(struct super_block *sb,
2227 struct ext3_super_block *es,
2228 unsigned long journal_devnum)
1da177e4
LT		 2229{
2230 journal_t *journal;
eee194e7 2231 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2232 dev_t journal_dev;
1da177e4
LT		 2233 int err = 0;
2234 int really_read_only;
2235
71b96257
JL		 2236 if (journal_devnum &&
2237 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
AF		 2238 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2239 "numbers have changed");
71b96257
JL		 2240 journal_dev = new_decode_dev(journal_devnum);
2241 } else
2242 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2243
1da177e4
LT		 2244 really_read_only = bdev_read_only(sb->s_bdev);
2245
2246 /*
2247 * Are we loading a blank journal or performing recovery after a
2248 * crash? For recovery, we need to check in advance whether we
2249 * can get read-write access to the device.
2250 */
2251
2252 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2253 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2254 ext3_msg(sb, KERN_INFO,
2255 "recovery required on readonly filesystem");
1da177e4 2256 if (really_read_only) {
4cf46b67
AF		 2257 ext3_msg(sb, KERN_ERR, "error: write access "
2258 "unavailable, cannot proceed");
1da177e4
LT		 2259 return -EROFS;
2260 }
4cf46b67
AF		 2261 ext3_msg(sb, KERN_INFO,
2262 "write access will be enabled during recovery");
1da177e4
LT		 2263 }
2264 }
2265
2266 if (journal_inum && journal_dev) {
4cf46b67
AF		 2267 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2268 "and inode journals");
1da177e4
LT		 2269 return -EINVAL;
2270 }
2271
2272 if (journal_inum) {
2273 if (!(journal = ext3_get_journal(sb, journal_inum)))
2274 return -EINVAL;
2275 } else {
2276 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2277 return -EINVAL;
2278 }
2279
2280 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2281 err = journal_update_format(journal);
2282 if (err) {
4cf46b67 2283 ext3_msg(sb, KERN_ERR, "error updating journal");
1da177e4
LT		 2284 journal_destroy(journal);
2285 return err;
2286 }
2287 }
2288
2289 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2290 err = journal_wipe(journal, !really_read_only);
2291 if (!err)
2292 err = journal_load(journal);
2293
2294 if (err) {
4cf46b67 2295 ext3_msg(sb, KERN_ERR, "error loading journal");
1da177e4
LT		 2296 journal_destroy(journal);
2297 return err;
2298 }
2299
2300 EXT3_SB(sb)->s_journal = journal;
2301 ext3_clear_journal_err(sb, es);
71b96257
JL		 2302
2303 if (journal_devnum &&
2304 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2305 es->s_journal_dev = cpu_to_le32(journal_devnum);
71b96257
JL		 2306
2307 /* Make sure we flush the recovery flag to disk. */
2308 ext3_commit_super(sb, es, 1);
2309 }
2310
1da177e4
LT		 2311 return 0;
2312}
2313
4cf46b67
AF		 2314static int ext3_create_journal(struct super_block *sb,
2315 struct ext3_super_block *es,
eee194e7 2316 unsigned int journal_inum)
1da177e4
LT		 2317{
2318 journal_t *journal;
952d9de1 2319 int err;
1da177e4
LT		 2320
2321 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2322 ext3_msg(sb, KERN_ERR,
2323 "error: readonly filesystem when trying to "
2324 "create journal");
1da177e4
LT		 2325 return -EROFS;
2326 }
2327
952d9de1
BP		 2328 journal = ext3_get_journal(sb, journal_inum);
2329 if (!journal)
1da177e4
LT		 2330 return -EINVAL;
2331
4cf46b67 2332 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
1da177e4
LT		 2333 journal_inum);
2334
952d9de1
BP		 2335 err = journal_create(journal);
2336 if (err) {
4cf46b67 2337 ext3_msg(sb, KERN_ERR, "error creating journal");
1da177e4
LT		 2338 journal_destroy(journal);
2339 return -EIO;
2340 }
2341
2342 EXT3_SB(sb)->s_journal = journal;
2343
2344 ext3_update_dynamic_rev(sb);
2345 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2346 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2347
2348 es->s_journal_inum = cpu_to_le32(journal_inum);
1da177e4
LT		 2349
2350 /* Make sure we flush the recovery flag to disk. */
2351 ext3_commit_super(sb, es, 1);
2352
2353 return 0;
2354}
2355
c4be0c1d
TS		 2356static int ext3_commit_super(struct super_block *sb,
2357 struct ext3_super_block *es,
1da177e4
LT		 2358 int sync)
2359{
2360 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2361 int error = 0;
1da177e4
LT		 2362
2363 if (!sbh)
c4be0c1d 2364 return error;
96ec2e0a
TT		 2365 /*
2366 * If the file system is mounted read-only, don't update the
2367 * superblock write time. This avoids updating the superblock
2368 * write time when we are mounting the root file system
2369 * read/only but we need to replay the journal; at that point,
2370 * for people who are east of GMT and who make their clock
2371 * tick in localtime for Windows bug-for-bug compatibility,
2372 * the clock is set in the future, and this will cause e2fsck
2373 * to complain and force a full file system check.
2374 */
2375 if (!(sb->s_flags & MS_RDONLY))
2376 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2377 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2378 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2379 BUFFER_TRACE(sbh, "marking dirty");
2380 mark_buffer_dirty(sbh);
2381 if (sync)
c4be0c1d
TS		 2382 error = sync_dirty_buffer(sbh);
2383 return error;
1da177e4
LT		 2384}
2385
2386
2387/*
2388 * Have we just finished recovery? If so, and if we are mounting (or
2389 * remounting) the filesystem readonly, then we will end up with a
2390 * consistent fs on disk. Record that fact.
2391 */
2392static void ext3_mark_recovery_complete(struct super_block * sb,
2393 struct ext3_super_block * es)
2394{
2395 journal_t *journal = EXT3_SB(sb)->s_journal;
2396
2397 journal_lock_updates(journal);
2d7c820e
HK		 2398 if (journal_flush(journal) < 0)
2399 goto out;
2400
1da177e4
LT		 2401 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2402 sb->s_flags & MS_RDONLY) {
2403 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2404 ext3_commit_super(sb, es, 1);
2405 }
2d7c820e
HK		 2406
2407out:
1da177e4
LT		 2408 journal_unlock_updates(journal);
2409}
2410
2411/*
2412 * If we are mounting (or read-write remounting) a filesystem whose journal
2413 * has recorded an error from a previous lifetime, move that error to the
2414 * main filesystem now.
2415 */
4cf46b67
AF		 2416static void ext3_clear_journal_err(struct super_block *sb,
2417 struct ext3_super_block *es)
1da177e4
LT		 2418{
2419 journal_t *journal;
2420 int j_errno;
2421 const char *errstr;
2422
2423 journal = EXT3_SB(sb)->s_journal;
2424
2425 /*
2426 * Now check for any error status which may have been recorded in the
2427 * journal by a prior ext3_error() or ext3_abort()
2428 */
2429
2430 j_errno = journal_errno(journal);
2431 if (j_errno) {
2432 char nbuf[16];
2433
2434 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2435 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2436 "from previous mount: %s", errstr);
e05b6b52 2437 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2438 "filesystem check.");
2439
2440 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2441 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2442 ext3_commit_super (sb, es, 1);
2443
2444 journal_clear_err(journal);
2445 }
2446}
2447
2448/*
2449 * Force the running and committing transactions to commit,
2450 * and wait on the commit.
2451 */
2452int ext3_force_commit(struct super_block *sb)
2453{
2454 journal_t *journal;
2455 int ret;
2456
2457 if (sb->s_flags & MS_RDONLY)
2458 return 0;
2459
2460 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2461 ret = ext3_journal_force_commit(journal);
2462 return ret;
2463}
2464
1da177e4
LT		 2465static int ext3_sync_fs(struct super_block *sb, int wait)
2466{
02ac597c 2467 tid_t target;
c87591b7 2468
02ac597c
JK		 2469 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2470 if (wait)
2471 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2472 }
1da177e4
LT		 2473 return 0;
2474}
2475
2476/*
2477 * LVM calls this function before a (read-only) snapshot is created. This
2478 * gives us a chance to flush the journal completely and mark the fs clean.
2479 */
c4be0c1d 2480static int ext3_freeze(struct super_block *sb)
1da177e4 2481{
c4be0c1d
TS		 2482 int error = 0;
2483 journal_t *journal;
1da177e4
LT		 2484
2485 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2486 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2487
2488 /* Now we set up the journal barrier. */
2489 journal_lock_updates(journal);
2d7c820e
HK		 2490
2491 /*
2492 * We don't want to clear needs_recovery flag when we failed
2493 * to flush the journal.
2494 */
c4be0c1d
TS		 2495 error = journal_flush(journal);
2496 if (error < 0)
2497 goto out;
1da177e4
LT		 2498
2499 /* Journal blocked and flushed, clear needs_recovery flag. */
2500 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2501 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2502 if (error)
2503 goto out;
1da177e4 2504 }
c4be0c1d
TS		 2505 return 0;
2506
2507out:
2508 journal_unlock_updates(journal);
2509 return error;
1da177e4
LT		 2510}
2511
2512/*
2513 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2514 * flag here, even though the filesystem is not technically dirty yet.
2515 */
c4be0c1d 2516static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2517{
2518 if (!(sb->s_flags & MS_RDONLY)) {
2519 lock_super(sb);
2520 /* Reser the needs_recovery flag before the fs is unlocked. */
2521 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2522 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2523 unlock_super(sb);
2524 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2525 }
c4be0c1d 2526 return 0;
1da177e4
LT		 2527}
2528
2529static int ext3_remount (struct super_block * sb, int * flags, char * data)
2530{
2531 struct ext3_super_block * es;
2532 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2533 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2534 unsigned long old_sb_flags;
2535 struct ext3_mount_options old_opts;
2536 int err;
2537#ifdef CONFIG_QUOTA
2538 int i;
2539#endif
2540
337eb00a
AIB		 2541 lock_kernel();
2542
08c6a96f 2543 /* Store the original options */
bbd6851a 2544 lock_super(sb);
08c6a96f
JK		 2545 old_sb_flags = sb->s_flags;
2546 old_opts.s_mount_opt = sbi->s_mount_opt;
2547 old_opts.s_resuid = sbi->s_resuid;
2548 old_opts.s_resgid = sbi->s_resgid;
2549 old_opts.s_commit_interval = sbi->s_commit_interval;
2550#ifdef CONFIG_QUOTA
2551 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2552 for (i = 0; i < MAXQUOTAS; i++)
2553 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2554#endif
1da177e4
LT		 2555
2556 /*
2557 * Allow the "check" option to be passed as a remount option.
2558 */
71b96257 2559 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2560 err = -EINVAL;
2561 goto restore_opts;
2562 }
1da177e4
LT		 2563
2564 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
e05b6b52 2565 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2566
2567 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2568 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2569
2570 es = sbi->s_es;
2571
2572 ext3_init_journal_params(sb, sbi->s_journal);
2573
2574 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2575 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
08c6a96f
JK		 2576 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2577 err = -EROFS;
2578 goto restore_opts;
2579 }
1da177e4
LT		 2580
2581 if (*flags & MS_RDONLY) {
2582 /*
2583 * First of all, the unconditional stuff we have to do
2584 * to disable replay of the journal when we next remount
2585 */
2586 sb->s_flags |= MS_RDONLY;
2587
2588 /*
2589 * OK, test if we are remounting a valid rw partition
2590 * readonly, and if so set the rdonly flag and then
2591 * mark the partition as valid again.
2592 */
2593 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2594 (sbi->s_mount_state & EXT3_VALID_FS))
2595 es->s_state = cpu_to_le16(sbi->s_mount_state);
2596
2597 ext3_mark_recovery_complete(sb, es);
2598 } else {
2599 __le32 ret;
2600 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2601 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
AF		 2602 ext3_msg(sb, KERN_WARNING,
2603 "warning: couldn't remount RDWR "
2604 "because of unsupported optional "
2605 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2606 err = -EROFS;
2607 goto restore_opts;
1da177e4 2608 }
ea9a05a1
ES		 2609
2610 /*
2611 * If we have an unprocessed orphan list hanging
2612 * around from a previously readonly bdev mount,
2613 * require a full umount/remount for now.
2614 */
2615 if (es->s_last_orphan) {
4cf46b67 2616 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2617 "remount RDWR because of unprocessed "
2618 "orphan inode list. Please "
4cf46b67 2619 "umount/remount instead.");
ea9a05a1
ES		 2620 err = -EINVAL;
2621 goto restore_opts;
2622 }
2623
1da177e4
LT		 2624 /*
2625 * Mounting a RDONLY partition read-write, so reread
2626 * and store the current valid flag. (It may have
2627 * been changed by e2fsck since we originally mounted
2628 * the partition.)
2629 */
2630 ext3_clear_journal_err(sb, es);
2631 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2632 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2633 goto restore_opts;
1da177e4
LT		 2634 if (!ext3_setup_super (sb, es, 0))
2635 sb->s_flags &= ~MS_RDONLY;
2636 }
2637 }
08c6a96f
JK		 2638#ifdef CONFIG_QUOTA
2639 /* Release old quota file names */
2640 for (i = 0; i < MAXQUOTAS; i++)
2641 if (old_opts.s_qf_names[i] &&
2642 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2643 kfree(old_opts.s_qf_names[i]);
2644#endif
bbd6851a 2645 unlock_super(sb);
337eb00a 2646 unlock_kernel();
1da177e4 2647 return 0;
08c6a96f
JK		 2648restore_opts:
2649 sb->s_flags = old_sb_flags;
2650 sbi->s_mount_opt = old_opts.s_mount_opt;
2651 sbi->s_resuid = old_opts.s_resuid;
2652 sbi->s_resgid = old_opts.s_resgid;
2653 sbi->s_commit_interval = old_opts.s_commit_interval;
2654#ifdef CONFIG_QUOTA
2655 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2656 for (i = 0; i < MAXQUOTAS; i++) {
2657 if (sbi->s_qf_names[i] &&
2658 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2659 kfree(sbi->s_qf_names[i]);
2660 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2661 }
2662#endif
bbd6851a 2663 unlock_super(sb);
337eb00a 2664 unlock_kernel();
08c6a96f 2665 return err;
1da177e4
LT		 2666}
2667
726c3342 2668static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2669{
726c3342 2670 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2671 struct ext3_sb_info *sbi = EXT3_SB(sb);
2672 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2673 u64 fsid;
1da177e4 2674
a71ce8c6
BP		 2675 if (test_opt(sb, MINIX_DF)) {
2676 sbi->s_overhead_last = 0;
2677 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2678 unsigned long ngroups = sbi->s_groups_count, i;
2679 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2680 smp_rmb();
2681
2682 /*
a71ce8c6
BP		 2683 * Compute the overhead (FS structures). This is constant
2684 * for a given filesystem unless the number of block groups
2685 * changes so we cache the previous value until it does.
1da177e4
LT		 2686 */
2687
2688 /*
2689 * All of the blocks before first_data_block are
2690 * overhead
2691 */
2692 overhead = le32_to_cpu(es->s_first_data_block);
2693
2694 /*
2695 * Add the overhead attributed to the superblock and
2696 * block group descriptors. If the sparse superblocks
2697 * feature is turned on, then not all groups have this.
2698 */
2699 for (i = 0; i < ngroups; i++) {
2700 overhead += ext3_bg_has_super(sb, i) +
2701 ext3_bg_num_gdb(sb, i);
2702 cond_resched();
2703 }
2704
2705 /*
2706 * Every block group has an inode bitmap, a block
2707 * bitmap, and an inode table.
2708 */
a71ce8c6
BP		 2709 overhead += ngroups * (2 + sbi->s_itb_per_group);
2710 sbi->s_overhead_last = overhead;
2711 smp_wmb();
2712 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2713 }
2714
2715 buf->f_type = EXT3_SUPER_MAGIC;
2716 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2717 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2718 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2719 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2720 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2721 buf->f_bavail = 0;
2722 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2723 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2724 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2725 fsid = le64_to_cpup((void *)es->s_uuid) ^
2726 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2727 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2728 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2729 return 0;
2730}
2731
2732/* Helper function for writing quotas on sync - we need to start transaction before quota file
2733 * is locked for write. Otherwise the are possible deadlocks:
2734 * Process 1 Process 2
2735 * ext3_create() quota_sync()
2736 * journal_start() write_dquot()
81a05227 2737 * vfs_dq_init() down(dqio_mutex)
d3be915f 2738 * down(dqio_mutex) journal_start()
1da177e4
LT		 2739 *
2740 */
2741
2742#ifdef CONFIG_QUOTA
2743
2744static inline struct inode *dquot_to_inode(struct dquot *dquot)
2745{
2746 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2747}
2748
1da177e4
LT		 2749static int ext3_write_dquot(struct dquot *dquot)
2750{
2751 int ret, err;
2752 handle_t *handle;
2753 struct inode *inode;
2754
2755 inode = dquot_to_inode(dquot);
2756 handle = ext3_journal_start(inode,
1f54587b 2757 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2758 if (IS_ERR(handle))
2759 return PTR_ERR(handle);
2760 ret = dquot_commit(dquot);
2761 err = ext3_journal_stop(handle);
2762 if (!ret)
2763 ret = err;
2764 return ret;
2765}
2766
2767static int ext3_acquire_dquot(struct dquot *dquot)
2768{
2769 int ret, err;
2770 handle_t *handle;
2771
2772 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2773 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2774 if (IS_ERR(handle))
2775 return PTR_ERR(handle);
2776 ret = dquot_acquire(dquot);
2777 err = ext3_journal_stop(handle);
2778 if (!ret)
2779 ret = err;
2780 return ret;
2781}
2782
2783static int ext3_release_dquot(struct dquot *dquot)
2784{
2785 int ret, err;
2786 handle_t *handle;
2787
2788 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2789 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2790 if (IS_ERR(handle)) {
2791 /* Release dquot anyway to avoid endless cycle in dqput() */
2792 dquot_release(dquot);
1da177e4 2793 return PTR_ERR(handle);
9c3013e9 2794 }
1da177e4
LT		 2795 ret = dquot_release(dquot);
2796 err = ext3_journal_stop(handle);
2797 if (!ret)
2798 ret = err;
2799 return ret;
2800}
2801
2802static int ext3_mark_dquot_dirty(struct dquot *dquot)
2803{
99aeaf63 2804 /* Are we journaling quotas? */
1da177e4
LT		 2805 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2806 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2807 dquot_mark_dquot_dirty(dquot);
2808 return ext3_write_dquot(dquot);
2809 } else {
2810 return dquot_mark_dquot_dirty(dquot);
2811 }
2812}
2813
2814static int ext3_write_info(struct super_block *sb, int type)
2815{
2816 int ret, err;
2817 handle_t *handle;
2818
2819 /* Data block + inode block */
2820 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2821 if (IS_ERR(handle))
2822 return PTR_ERR(handle);
2823 ret = dquot_commit_info(sb, type);
2824 err = ext3_journal_stop(handle);
2825 if (!ret)
2826 ret = err;
2827 return ret;
2828}
2829
2830/*
2831 * Turn on quotas during mount time - we need to find
2832 * the quota file and such...
2833 */
2834static int ext3_quota_on_mount(struct super_block *sb, int type)
2835{
84de856e
CH		 2836 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2837 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2838}
2839
2840/*
2841 * Standard function to be called on quota_on
2842 */
2843static int ext3_quota_on(struct super_block *sb, int type, int format_id,
8264613d 2844 char *name, int remount)
1da177e4
LT		 2845{
2846 int err;
8264613d 2847 struct path path;
1da177e4 2848
1f54587b
JK		 2849 if (!test_opt(sb, QUOTA))
2850 return -EINVAL;
8264613d 2851 /* When remounting, no checks are needed and in fact, name is NULL */
9cfe7b90 2852 if (remount)
8264613d 2853 return vfs_quota_on(sb, type, format_id, name, remount);
9cfe7b90 2854
8264613d 2855 err = kern_path(name, LOOKUP_FOLLOW, &path);
1da177e4
LT		 2856 if (err)
2857 return err;
9cfe7b90 2858
1da177e4 2859 /* Quotafile not on the same filesystem? */
8264613d
AV		 2860 if (path.mnt->mnt_sb != sb) {
2861 path_put(&path);
1da177e4
LT		 2862 return -EXDEV;
2863 }
9cfe7b90
JK		 2864 /* Journaling quota? */
2865 if (EXT3_SB(sb)->s_qf_names[type]) {
2866 /* Quotafile not of fs root? */
8264613d 2867 if (path.dentry->d_parent != sb->s_root)
4cf46b67
AF		 2868 ext3_msg(sb, KERN_WARNING,
2869 "warning: Quota file not on filesystem root. "
2870 "Journaled quota will not work.");
9cfe7b90
JK		 2871 }
2872
2873 /*
2874 * When we journal data on quota file, we have to flush journal to see
2875 * all updates to the file when we bypass pagecache...
2876 */
8264613d 2877 if (ext3_should_journal_data(path.dentry->d_inode)) {
9cfe7b90
JK		 2878 /*
2879 * We don't need to lock updates but journal_flush() could
2880 * otherwise be livelocked...
2881 */
2882 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2883 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2884 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2885 if (err) {
12e1ec9f 2886 path_put(&path);
2d7c820e
HK		 2887 return err;
2888 }
9cfe7b90
JK		 2889 }
2890
8264613d
AV		 2891 err = vfs_quota_on_path(sb, type, format_id, &path);
2892 path_put(&path);
77e69dac 2893 return err;
1da177e4
LT		 2894}
2895
2896/* Read data from quotafile - avoid pagecache and such because we cannot afford
2897 * acquiring the locks... As quota files are never truncated and quota code
2898 * itself serializes the operations (and noone else should touch the files)
2899 * we don't have to be afraid of races */
2900static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2901 size_t len, loff_t off)
2902{
2903 struct inode *inode = sb_dqopt(sb)->files[type];
2904 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2905 int err = 0;
2906 int offset = off & (sb->s_blocksize - 1);
2907 int tocopy;
2908 size_t toread;
2909 struct buffer_head *bh;
2910 loff_t i_size = i_size_read(inode);
2911
2912 if (off > i_size)
2913 return 0;
2914 if (off+len > i_size)
2915 len = i_size-off;
2916 toread = len;
2917 while (toread > 0) {
2918 tocopy = sb->s_blocksize - offset < toread ?
2919 sb->s_blocksize - offset : toread;
2920 bh = ext3_bread(NULL, inode, blk, 0, &err);
2921 if (err)
2922 return err;
2923 if (!bh) /* A hole? */
2924 memset(data, 0, tocopy);
2925 else
2926 memcpy(data, bh->b_data+offset, tocopy);
2927 brelse(bh);
2928 offset = 0;
2929 toread -= tocopy;
2930 data += tocopy;
2931 blk++;
2932 }
2933 return len;
2934}
2935
2936/* Write to quotafile (we know the transaction is already started and has
2937 * enough credits) */
2938static ssize_t ext3_quota_write(struct super_block *sb, int type,
2939 const char *data, size_t len, loff_t off)
2940{
2941 struct inode *inode = sb_dqopt(sb)->files[type];
2942 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2943 int err = 0;
2944 int offset = off & (sb->s_blocksize - 1);
2945 int tocopy;
2946 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2947 size_t towrite = len;
2948 struct buffer_head *bh;
2949 handle_t *handle = journal_current_handle();
2950
9c3013e9 2951 if (!handle) {
4cf46b67
AF		 2952 ext3_msg(sb, KERN_WARNING,
2953 "warning: quota write (off=%llu, len=%llu)"
2954 " cancelled because transaction is not started.",
9c3013e9
JK		 2955 (unsigned long long)off, (unsigned long long)len);
2956 return -EIO;
2957 }
5c81a419 2958 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1da177e4
LT		 2959 while (towrite > 0) {
2960 tocopy = sb->s_blocksize - offset < towrite ?
2961 sb->s_blocksize - offset : towrite;
2962 bh = ext3_bread(handle, inode, blk, 1, &err);
2963 if (!bh)
2964 goto out;
2965 if (journal_quota) {
2966 err = ext3_journal_get_write_access(handle, bh);
2967 if (err) {
2968 brelse(bh);
2969 goto out;
2970 }
2971 }
2972 lock_buffer(bh);
2973 memcpy(bh->b_data+offset, data, tocopy);
2974 flush_dcache_page(bh->b_page);
2975 unlock_buffer(bh);
2976 if (journal_quota)
2977 err = ext3_journal_dirty_metadata(handle, bh);
2978 else {
2979 /* Always do at least ordered writes for quotas */
2980 err = ext3_journal_dirty_data(handle, bh);
2981 mark_buffer_dirty(bh);
2982 }
2983 brelse(bh);
2984 if (err)
2985 goto out;
2986 offset = 0;
2987 towrite -= tocopy;
2988 data += tocopy;
2989 blk++;
2990 }
2991out:
f5c8f7da
JK		 2992 if (len == towrite) {
2993 mutex_unlock(&inode->i_mutex);
1da177e4 2994 return err;
f5c8f7da 2995 }
1da177e4
LT		 2996 if (inode->i_size < off+len-towrite) {
2997 i_size_write(inode, off+len-towrite);
2998 EXT3_I(inode)->i_disksize = inode->i_size;
2999 }
3000 inode->i_version++;
3001 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3002 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 3003 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 3004 return len - towrite;
3005}
3006
3007#endif
3008
454e2398
DH		 3009static int ext3_get_sb(struct file_system_type *fs_type,
3010 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 3011{
454e2398 3012 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
1da177e4
LT		 3013}
3014
3015static struct file_system_type ext3_fs_type = {
3016 .owner = THIS_MODULE,
3017 .name = "ext3",
3018 .get_sb = ext3_get_sb,
3019 .kill_sb = kill_block_super,
3020 .fs_flags = FS_REQUIRES_DEV,
3021};
3022
3023static int __init init_ext3_fs(void)
3024{
3025 int err = init_ext3_xattr();
3026 if (err)
3027 return err;
3028 err = init_inodecache();
3029 if (err)
3030 goto out1;
3031 err = register_filesystem(&ext3_fs_type);
3032 if (err)
3033 goto out;
3034 return 0;
3035out:
3036 destroy_inodecache();
3037out1:
e9ad5620 3038 exit_ext3_xattr();
1da177e4
LT		 3039 return err;
3040}
3041
3042static void __exit exit_ext3_fs(void)
3043{
3044 unregister_filesystem(&ext3_fs_type);
3045 destroy_inodecache();
3046 exit_ext3_xattr();
3047}
3048
3049MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3050MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3051MODULE_LICENSE("GPL");
3052module_init(init_ext3_fs)
3053module_exit(exit_ext3_fs)
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