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ext3: Use DIV_ROUND_UP() on group desc block counting
[net-next-2.6.git] / fs / ext3 / super.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
1da177e4
LT		 19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
a5694255 32#include <linux/exportfs.h>
1da177e4
LT		 33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
8fc2751b 38#include <linux/seq_file.h>
3fc74269 39#include <linux/log2.h>
381be254 40
1da177e4 41#include <asm/uaccess.h>
381be254 42
1da177e4
LT		 43#include "xattr.h"
44#include "acl.h"
381be254 45#include "namei.h"
1da177e4 46
bbae8bcc
LT		 47#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
48 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
49#else
50 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
51#endif
52
71b96257
JL		 53static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
54 unsigned long journal_devnum);
1da177e4 55static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 56 unsigned int);
c4be0c1d
TS		 57static int ext3_commit_super(struct super_block *sb,
58 struct ext3_super_block *es,
1da177e4
LT		 59 int sync);
60static void ext3_mark_recovery_complete(struct super_block * sb,
61 struct ext3_super_block * es);
62static void ext3_clear_journal_err(struct super_block * sb,
63 struct ext3_super_block * es);
64static int ext3_sync_fs(struct super_block *sb, int wait);
65static const char *ext3_decode_error(struct super_block * sb, int errno,
66 char nbuf[16]);
67static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 68static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 69static int ext3_unfreeze(struct super_block *sb);
c4be0c1d 70static int ext3_freeze(struct super_block *sb);
1da177e4 71
ae6ddcc5 72/*
1da177e4
LT		 73 * Wrappers for journal_start/end.
74 *
75 * The only special thing we need to do here is to make sure that all
76 * journal_end calls result in the superblock being marked dirty, so
77 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 78 * appropriate.
1da177e4
LT		 79 */
80handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
81{
82 journal_t *journal;
83
84 if (sb->s_flags & MS_RDONLY)
85 return ERR_PTR(-EROFS);
86
87 /* Special case here: if the journal has aborted behind our
88 * backs (eg. EIO in the commit thread), then we still need to
89 * take the FS itself readonly cleanly. */
90 journal = EXT3_SB(sb)->s_journal;
91 if (is_journal_aborted(journal)) {
e05b6b52 92 ext3_abort(sb, __func__,
1da177e4
LT		 93 "Detected aborted journal");
94 return ERR_PTR(-EROFS);
95 }
96
97 return journal_start(journal, nblocks);
98}
99
ae6ddcc5 100/*
1da177e4
LT		 101 * The only special thing we need to do here is to make sure that all
102 * journal_stop calls result in the superblock being marked dirty, so
103 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 104 * appropriate.
1da177e4
LT		 105 */
106int __ext3_journal_stop(const char *where, handle_t *handle)
107{
108 struct super_block *sb;
109 int err;
110 int rc;
111
112 sb = handle->h_transaction->t_journal->j_private;
113 err = handle->h_err;
114 rc = journal_stop(handle);
115
116 if (!err)
117 err = rc;
118 if (err)
119 __ext3_std_error(sb, where, err);
120 return err;
121}
122
123void ext3_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err)
125{
126 char nbuf[16];
127 const char *errstr = ext3_decode_error(NULL, err, nbuf);
128
129 if (bh)
130 BUFFER_TRACE(bh, "abort");
131
132 if (!handle->h_err)
133 handle->h_err = err;
134
135 if (is_handle_aborted(handle))
136 return;
137
4cf46b67
AF		 138 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
139 caller, errstr, err_fn);
1da177e4
LT		 140
141 journal_abort_handle(handle);
142}
143
4cf46b67
AF		 144void ext3_msg(struct super_block *sb, const char *prefix,
145 const char *fmt, ...)
146{
147 va_list args;
148
149 va_start(args, fmt);
150 printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
151 vprintk(fmt, args);
152 printk("\n");
153 va_end(args);
154}
155
1da177e4
LT		 156/* Deal with the reporting of failure conditions on a filesystem such as
157 * inconsistencies detected or read IO failures.
158 *
159 * On ext2, we can store the error state of the filesystem in the
160 * superblock. That is not possible on ext3, because we may have other
161 * write ordering constraints on the superblock which prevent us from
162 * writing it out straight away; and given that the journal is about to
163 * be aborted, we can't rely on the current, or future, transactions to
164 * write out the superblock safely.
165 *
166 * We'll just use the journal_abort() error code to record an error in
d6b198bc 167 * the journal instead. On recovery, the journal will complain about
1da177e4
LT		 168 * that error until we've noted it down and cleared it.
169 */
170
171static void ext3_handle_error(struct super_block *sb)
172{
173 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
174
175 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
176 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
177
178 if (sb->s_flags & MS_RDONLY)
179 return;
180
7543fc7b 181 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 182 journal_t *journal = EXT3_SB(sb)->s_journal;
183
e3c96435 184 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
1da177e4
LT		 185 if (journal)
186 journal_abort(journal, -EIO);
187 }
7543fc7b 188 if (test_opt (sb, ERRORS_RO)) {
4cf46b67
AF		 189 ext3_msg(sb, KERN_CRIT,
190 "error: remounting filesystem read-only");
7543fc7b
VA		 191 sb->s_flags |= MS_RDONLY;
192 }
193 ext3_commit_super(sb, es, 1);
1da177e4 194 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 195 panic("EXT3-fs (%s): panic forced after error\n",
1da177e4 196 sb->s_id);
1da177e4
LT		 197}
198
199void ext3_error (struct super_block * sb, const char * function,
200 const char * fmt, ...)
201{
202 va_list args;
203
204 va_start(args, fmt);
205 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
206 vprintk(fmt, args);
207 printk("\n");
208 va_end(args);
209
210 ext3_handle_error(sb);
211}
212
213static const char *ext3_decode_error(struct super_block * sb, int errno,
214 char nbuf[16])
215{
216 char *errstr = NULL;
217
218 switch (errno) {
219 case -EIO:
220 errstr = "IO failure";
221 break;
222 case -ENOMEM:
223 errstr = "Out of memory";
224 break;
225 case -EROFS:
226 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
227 errstr = "Journal has aborted";
228 else
229 errstr = "Readonly filesystem";
230 break;
231 default:
232 /* If the caller passed in an extra buffer for unknown
233 * errors, textualise them now. Else we just return
234 * NULL. */
235 if (nbuf) {
236 /* Check for truncated error codes... */
237 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
238 errstr = nbuf;
239 }
240 break;
241 }
242
243 return errstr;
244}
245
246/* __ext3_std_error decodes expected errors from journaling functions
247 * automatically and invokes the appropriate error response. */
248
249void __ext3_std_error (struct super_block * sb, const char * function,
250 int errno)
251{
252 char nbuf[16];
30121624 253 const char *errstr;
1da177e4 254
30121624
ST		 255 /* Special case: if the error is EROFS, and we're not already
256 * inside a transaction, then there's really no point in logging
257 * an error. */
258 if (errno == -EROFS && journal_current_handle() == NULL &&
259 (sb->s_flags & MS_RDONLY))
260 return;
261
262 errstr = ext3_decode_error(sb, errno, nbuf);
4cf46b67 263 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
1da177e4
LT		 264
265 ext3_handle_error(sb);
266}
267
268/*
269 * ext3_abort is a much stronger failure handler than ext3_error. The
270 * abort function may be used to deal with unrecoverable failures such
271 * as journal IO errors or ENOMEM at a critical moment in log management.
272 *
273 * We unconditionally force the filesystem into an ABORT|READONLY state,
274 * unless the error response on the fs has been set to panic in which
275 * case we take the easy way out and panic immediately.
276 */
277
278void ext3_abort (struct super_block * sb, const char * function,
279 const char * fmt, ...)
280{
281 va_list args;
282
1da177e4 283 va_start(args, fmt);
4cf46b67 284 printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
1da177e4
LT		 285 vprintk(fmt, args);
286 printk("\n");
287 va_end(args);
288
289 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 290 panic("EXT3-fs: panic from previous error\n");
1da177e4
LT		 291
292 if (sb->s_flags & MS_RDONLY)
293 return;
294
4cf46b67
AF		 295 ext3_msg(sb, KERN_CRIT,
296 "error: remounting filesystem read-only");
1da177e4
LT		 297 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
298 sb->s_flags |= MS_RDONLY;
e3c96435 299 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
44d6f787
HK		 300 if (EXT3_SB(sb)->s_journal)
301 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 302}
303
304void ext3_warning (struct super_block * sb, const char * function,
305 const char * fmt, ...)
306{
307 va_list args;
308
309 va_start(args, fmt);
4cf46b67 310 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
1da177e4
LT		 311 sb->s_id, function);
312 vprintk(fmt, args);
313 printk("\n");
314 va_end(args);
315}
316
317void ext3_update_dynamic_rev(struct super_block *sb)
318{
319 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
320
321 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
322 return;
323
4cf46b67
AF		 324 ext3_msg(sb, KERN_WARNING,
325 "warning: updating to rev %d because of "
326 "new feature flag, running e2fsck is recommended",
327 EXT3_DYNAMIC_REV);
1da177e4
LT		 328
329 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332 /* leave es->s_feature_*compat flags alone */
333 /* es->s_uuid will be set by e2fsck if empty */
334
335 /*
336 * The rest of the superblock fields should be zero, and if not it
337 * means they are likely already in use, so leave them alone. We
338 * can leave it up to e2fsck to clean up any inconsistencies there.
339 */
340}
341
342/*
343 * Open the external journal device
344 */
4cf46b67 345static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
1da177e4
LT		 346{
347 struct block_device *bdev;
348 char b[BDEVNAME_SIZE];
349
350 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
351 if (IS_ERR(bdev))
352 goto fail;
353 return bdev;
354
355fail:
4cf46b67
AF		 356 ext3_msg(sb, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
358
1da177e4
LT		 359 return NULL;
360}
361
362/*
363 * Release the journal device
364 */
365static int ext3_blkdev_put(struct block_device *bdev)
366{
367 bd_release(bdev);
9a1c3542 368 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 369}
370
371static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
372{
373 struct block_device *bdev;
374 int ret = -ENODEV;
375
376 bdev = sbi->journal_bdev;
377 if (bdev) {
378 ret = ext3_blkdev_put(bdev);
379 sbi->journal_bdev = NULL;
380 }
381 return ret;
382}
383
384static inline struct inode *orphan_list_entry(struct list_head *l)
385{
386 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
387}
388
389static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
390{
391 struct list_head *l;
392
4cf46b67 393 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
1da177e4
LT		 394 le32_to_cpu(sbi->s_es->s_last_orphan));
395
4cf46b67 396 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
1da177e4
LT		 397 list_for_each(l, &sbi->s_orphan) {
398 struct inode *inode = orphan_list_entry(l);
4cf46b67 399 ext3_msg(sb, KERN_ERR, " "
eee194e7 400 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 401 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 402 inode->i_mode, inode->i_nlink,
1da177e4
LT		 403 NEXT_ORPHAN(inode));
404 }
405}
406
407static void ext3_put_super (struct super_block * sb)
408{
409 struct ext3_sb_info *sbi = EXT3_SB(sb);
410 struct ext3_super_block *es = sbi->s_es;
44d6f787 411 int i, err;
1da177e4 412
e0ccfd95
CH		 413 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
414
6cfd0148
CH		 415 lock_kernel();
416
1da177e4 417 ext3_xattr_put_super(sb);
44d6f787
HK		 418 err = journal_destroy(sbi->s_journal);
419 sbi->s_journal = NULL;
420 if (err < 0)
2d7c820e 421 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 422
1da177e4
LT		 423 if (!(sb->s_flags & MS_RDONLY)) {
424 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
425 es->s_state = cpu_to_le16(sbi->s_mount_state);
426 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
427 mark_buffer_dirty(sbi->s_sbh);
428 ext3_commit_super(sb, es, 1);
429 }
430
431 for (i = 0; i < sbi->s_gdb_count; i++)
432 brelse(sbi->s_group_desc[i]);
433 kfree(sbi->s_group_desc);
434 percpu_counter_destroy(&sbi->s_freeblocks_counter);
435 percpu_counter_destroy(&sbi->s_freeinodes_counter);
436 percpu_counter_destroy(&sbi->s_dirs_counter);
437 brelse(sbi->s_sbh);
438#ifdef CONFIG_QUOTA
439 for (i = 0; i < MAXQUOTAS; i++)
440 kfree(sbi->s_qf_names[i]);
441#endif
442
443 /* Debugging code just in case the in-memory inode orphan list
444 * isn't empty. The on-disk one can be non-empty if we've
445 * detected an error and taken the fs readonly, but the
446 * in-memory list had better be clean by this point. */
447 if (!list_empty(&sbi->s_orphan))
448 dump_orphan_list(sb, sbi);
449 J_ASSERT(list_empty(&sbi->s_orphan));
450
f98393a6 451 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 452 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
453 /*
454 * Invalidate the journal device's buffers. We don't want them
455 * floating about in memory - the physical journal device may
456 * hotswapped, and it breaks the `ro-after' testing code.
457 */
458 sync_blockdev(sbi->journal_bdev);
f98393a6 459 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 460 ext3_blkdev_remove(sbi);
461 }
462 sb->s_fs_info = NULL;
5df096d6 463 kfree(sbi->s_blockgroup_lock);
1da177e4 464 kfree(sbi);
6cfd0148
CH		 465
466 unlock_kernel();
1da177e4
LT		 467}
468
e18b890b 469static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 470
471/*
472 * Called inside transaction, so use GFP_NOFS
473 */
474static struct inode *ext3_alloc_inode(struct super_block *sb)
475{
476 struct ext3_inode_info *ei;
477
e6b4f8da 478 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 479 if (!ei)
480 return NULL;
1da177e4
LT		 481 ei->i_block_alloc_info = NULL;
482 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 483 atomic_set(&ei->i_datasync_tid, 0);
484 atomic_set(&ei->i_sync_tid, 0);
1da177e4
LT		 485 return &ei->vfs_inode;
486}
487
488static void ext3_destroy_inode(struct inode *inode)
489{
9f7dd93d
VA		 490 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
491 printk("EXT3 Inode %p: orphan list check failed!\n",
492 EXT3_I(inode));
493 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
494 EXT3_I(inode), sizeof(struct ext3_inode_info),
495 false);
496 dump_stack();
497 }
1da177e4
LT		 498 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
499}
500
51cc5068 501static void init_once(void *foo)
1da177e4
LT		 502{
503 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
504
a35afb83 505 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 506#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 507 init_rwsem(&ei->xattr_sem);
1da177e4 508#endif
a35afb83
CL		 509 mutex_init(&ei->truncate_mutex);
510 inode_init_once(&ei->vfs_inode);
1da177e4 511}
ae6ddcc5 512
1da177e4
LT		 513static int init_inodecache(void)
514{
515 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
516 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 517 0, (SLAB_RECLAIM_ACCOUNT|
518 SLAB_MEM_SPREAD),
20c2df83 519 init_once);
1da177e4
LT		 520 if (ext3_inode_cachep == NULL)
521 return -ENOMEM;
522 return 0;
523}
524
525static void destroy_inodecache(void)
526{
1a1d92c1 527 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 528}
529
6cd37cda 530static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 531{
6cd37cda 532#if defined(CONFIG_QUOTA)
275abf5b 533 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 534
1aeec434
JK		 535 if (sbi->s_jquota_fmt) {
536 char *fmtname = "";
537
538 switch (sbi->s_jquota_fmt) {
539 case QFMT_VFS_OLD:
540 fmtname = "vfsold";
541 break;
542 case QFMT_VFS_V0:
543 fmtname = "vfsv0";
544 break;
545 case QFMT_VFS_V1:
546 fmtname = "vfsv1";
547 break;
548 }
549 seq_printf(seq, ",jqfmt=%s", fmtname);
550 }
8fc2751b
MB		 551
552 if (sbi->s_qf_names[USRQUOTA])
553 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
554
555 if (sbi->s_qf_names[GRPQUOTA])
556 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
557
e3c96435 558 if (test_opt(sb, USRQUOTA))
8fc2751b
MB		 559 seq_puts(seq, ",usrquota");
560
e3c96435 561 if (test_opt(sb, GRPQUOTA))
8fc2751b
MB		 562 seq_puts(seq, ",grpquota");
563#endif
6cd37cda
PO		 564}
565
3c4cec65
JK		 566static char *data_mode_string(unsigned long mode)
567{
568 switch (mode) {
569 case EXT3_MOUNT_JOURNAL_DATA:
570 return "journal";
571 case EXT3_MOUNT_ORDERED_DATA:
572 return "ordered";
573 case EXT3_MOUNT_WRITEBACK_DATA:
574 return "writeback";
575 }
576 return "unknown";
577}
578
571beed8
MS		 579/*
580 * Show an option if
581 * - it's set to a non-default value OR
582 * - if the per-sb default is different from the global default
583 */
6cd37cda
PO		 584static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
585{
586 struct super_block *sb = vfs->mnt_sb;
571beed8
MS		 587 struct ext3_sb_info *sbi = EXT3_SB(sb);
588 struct ext3_super_block *es = sbi->s_es;
589 unsigned long def_mount_opts;
590
591 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
592
593 if (sbi->s_sb_block != 1)
594 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
595 if (test_opt(sb, MINIX_DF))
596 seq_puts(seq, ",minixdf");
597 if (test_opt(sb, GRPID))
598 seq_puts(seq, ",grpid");
599 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
600 seq_puts(seq, ",nogrpid");
601 if (sbi->s_resuid != EXT3_DEF_RESUID ||
602 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
603 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
604 }
605 if (sbi->s_resgid != EXT3_DEF_RESGID ||
606 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
607 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
608 }
1eca93f9 609 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 610 int def_errors = le16_to_cpu(es->s_errors);
611
612 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 613 def_errors == EXT3_ERRORS_CONTINUE) {
614 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 615 }
616 }
1eca93f9
AK		 617 if (test_opt(sb, ERRORS_CONT))
618 seq_puts(seq, ",errors=continue");
571beed8
MS		 619 if (test_opt(sb, ERRORS_PANIC))
620 seq_puts(seq, ",errors=panic");
621 if (test_opt(sb, NO_UID32))
622 seq_puts(seq, ",nouid32");
623 if (test_opt(sb, DEBUG))
624 seq_puts(seq, ",debug");
625 if (test_opt(sb, OLDALLOC))
626 seq_puts(seq, ",oldalloc");
627#ifdef CONFIG_EXT3_FS_XATTR
628 if (test_opt(sb, XATTR_USER))
629 seq_puts(seq, ",user_xattr");
630 if (!test_opt(sb, XATTR_USER) &&
631 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
632 seq_puts(seq, ",nouser_xattr");
633 }
634#endif
635#ifdef CONFIG_EXT3_FS_POSIX_ACL
636 if (test_opt(sb, POSIX_ACL))
637 seq_puts(seq, ",acl");
638 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
639 seq_puts(seq, ",noacl");
640#endif
641 if (!test_opt(sb, RESERVATION))
642 seq_puts(seq, ",noreservation");
643 if (sbi->s_commit_interval) {
644 seq_printf(seq, ",commit=%u",
645 (unsigned) (sbi->s_commit_interval / HZ));
646 }
0636c73e
ES		 647
648 /*
649 * Always display barrier state so it's clear what the status is.
650 */
651 seq_puts(seq, ",barrier=");
652 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
e3c96435 653 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
0e4fb5e2
HK		 654 if (test_opt(sb, DATA_ERR_ABORT))
655 seq_puts(seq, ",data_err=abort");
656
dee1d3b6
ES		 657 if (test_opt(sb, NOLOAD))
658 seq_puts(seq, ",norecovery");
659
6cd37cda 660 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 661
662 return 0;
663}
1da177e4 664
fdb36673 665
74af0baa
CH		 666static struct inode *ext3_nfs_get_inode(struct super_block *sb,
667 u64 ino, u32 generation)
fdb36673 668{
fdb36673 669 struct inode *inode;
fdb36673
N		 670
671 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
672 return ERR_PTR(-ESTALE);
673 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
674 return ERR_PTR(-ESTALE);
675
676 /* iget isn't really right if the inode is currently unallocated!!
677 *
678 * ext3_read_inode will return a bad_inode if the inode had been
679 * deleted, so we should be safe.
680 *
681 * Currently we don't know the generation for parent directory, so
682 * a generation of 0 means "accept any"
683 */
473043dc
DH		 684 inode = ext3_iget(sb, ino);
685 if (IS_ERR(inode))
686 return ERR_CAST(inode);
687 if (generation && inode->i_generation != generation) {
fdb36673
N		 688 iput(inode);
689 return ERR_PTR(-ESTALE);
690 }
74af0baa
CH		 691
692 return inode;
693}
694
695static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
696 int fh_len, int fh_type)
697{
698 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
699 ext3_nfs_get_inode);
700}
701
702static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
703 int fh_len, int fh_type)
704{
705 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
706 ext3_nfs_get_inode);
fdb36673
N		 707}
708
6b082b53
TO		 709/*
710 * Try to release metadata pages (indirect blocks, directories) which are
711 * mapped via the block device. Since these pages could have journal heads
712 * which would prevent try_to_free_buffers() from freeing them, we must use
713 * jbd layer's try_to_free_buffers() function to release them.
714 */
715static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
716 gfp_t wait)
717{
718 journal_t *journal = EXT3_SB(sb)->s_journal;
719
720 WARN_ON(PageChecked(page));
721 if (!page_has_buffers(page))
722 return 0;
723 if (journal)
724 return journal_try_to_free_buffers(journal, page,
725 wait & ~__GFP_WAIT);
726 return try_to_free_buffers(page);
727}
728
8fc2751b 729#ifdef CONFIG_QUOTA
1da177e4
LT		 730#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
731#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
732
1da177e4
LT		 733static int ext3_write_dquot(struct dquot *dquot);
734static int ext3_acquire_dquot(struct dquot *dquot);
735static int ext3_release_dquot(struct dquot *dquot);
736static int ext3_mark_dquot_dirty(struct dquot *dquot);
737static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f 738static int ext3_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 739 char *path);
1da177e4
LT		 740static int ext3_quota_on_mount(struct super_block *sb, int type);
741static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
742 size_t len, loff_t off);
743static ssize_t ext3_quota_write(struct super_block *sb, int type,
744 const char *data, size_t len, loff_t off);
745
61e225dc 746static const struct dquot_operations ext3_quota_operations = {
1da177e4
LT		 747 .write_dquot = ext3_write_dquot,
748 .acquire_dquot = ext3_acquire_dquot,
749 .release_dquot = ext3_release_dquot,
750 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 751 .write_info = ext3_write_info,
752 .alloc_dquot = dquot_alloc,
753 .destroy_dquot = dquot_destroy,
1da177e4
LT		 754};
755
0d54b217 756static const struct quotactl_ops ext3_qctl_operations = {
1da177e4 757 .quota_on = ext3_quota_on,
287a8095
CH		 758 .quota_off = dquot_quota_off,
759 .quota_sync = dquot_quota_sync,
760 .get_info = dquot_get_dqinfo,
761 .set_info = dquot_set_dqinfo,
762 .get_dqblk = dquot_get_dqblk,
763 .set_dqblk = dquot_set_dqblk
1da177e4
LT		 764};
765#endif
766
ee9b6d61 767static const struct super_operations ext3_sops = {
1da177e4
LT		 768 .alloc_inode = ext3_alloc_inode,
769 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 770 .write_inode = ext3_write_inode,
771 .dirty_inode = ext3_dirty_inode,
ac14a95b 772 .evict_inode = ext3_evict_inode,
1da177e4 773 .put_super = ext3_put_super,
1da177e4 774 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 775 .freeze_fs = ext3_freeze,
776 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 777 .statfs = ext3_statfs,
778 .remount_fs = ext3_remount,
8fc2751b 779 .show_options = ext3_show_options,
1da177e4
LT		 780#ifdef CONFIG_QUOTA
781 .quota_read = ext3_quota_read,
782 .quota_write = ext3_quota_write,
783#endif
6b082b53 784 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 785};
786
39655164 787static const struct export_operations ext3_export_ops = {
74af0baa
CH		 788 .fh_to_dentry = ext3_fh_to_dentry,
789 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 790 .get_parent = ext3_get_parent,
791};
792
793enum {
794 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
795 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 796 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 797 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 798 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 799 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 800 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 801 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 802 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1aeec434 803 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
0636c73e
ES		 804 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
805 Opt_resize, Opt_usrquota, Opt_grpquota
1da177e4
LT		 806};
807
a447c093 808static const match_table_t tokens = {
1da177e4
LT		 809 {Opt_bsd_df, "bsddf"},
810 {Opt_minix_df, "minixdf"},
811 {Opt_grpid, "grpid"},
812 {Opt_grpid, "bsdgroups"},
813 {Opt_nogrpid, "nogrpid"},
814 {Opt_nogrpid, "sysvgroups"},
815 {Opt_resgid, "resgid=%u"},
816 {Opt_resuid, "resuid=%u"},
817 {Opt_sb, "sb=%u"},
818 {Opt_err_cont, "errors=continue"},
819 {Opt_err_panic, "errors=panic"},
820 {Opt_err_ro, "errors=remount-ro"},
821 {Opt_nouid32, "nouid32"},
822 {Opt_nocheck, "nocheck"},
823 {Opt_nocheck, "check=none"},
1da177e4
LT		 824 {Opt_debug, "debug"},
825 {Opt_oldalloc, "oldalloc"},
826 {Opt_orlov, "orlov"},
827 {Opt_user_xattr, "user_xattr"},
828 {Opt_nouser_xattr, "nouser_xattr"},
829 {Opt_acl, "acl"},
830 {Opt_noacl, "noacl"},
831 {Opt_reservation, "reservation"},
832 {Opt_noreservation, "noreservation"},
833 {Opt_noload, "noload"},
dee1d3b6 834 {Opt_noload, "norecovery"},
1da177e4 835 {Opt_nobh, "nobh"},
ade1a29e 836 {Opt_bh, "bh"},
1da177e4
LT		 837 {Opt_commit, "commit=%u"},
838 {Opt_journal_update, "journal=update"},
839 {Opt_journal_inum, "journal=%u"},
71b96257 840 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 841 {Opt_abort, "abort"},
842 {Opt_data_journal, "data=journal"},
843 {Opt_data_ordered, "data=ordered"},
844 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 845 {Opt_data_err_abort, "data_err=abort"},
846 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 847 {Opt_offusrjquota, "usrjquota="},
848 {Opt_usrjquota, "usrjquota=%s"},
849 {Opt_offgrpjquota, "grpjquota="},
850 {Opt_grpjquota, "grpjquota=%s"},
851 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
852 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1aeec434 853 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
8fc2751b 854 {Opt_grpquota, "grpquota"},
1f54587b
JK		 855 {Opt_noquota, "noquota"},
856 {Opt_quota, "quota"},
8fc2751b 857 {Opt_usrquota, "usrquota"},
1da177e4 858 {Opt_barrier, "barrier=%u"},
0636c73e
ES		 859 {Opt_barrier, "barrier"},
860 {Opt_nobarrier, "nobarrier"},
1da177e4 861 {Opt_resize, "resize"},
92587216 862 {Opt_err, NULL},
1da177e4
LT		 863};
864
4cf46b67 865static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 866{
e9ad5620
DK		 867 ext3_fsblk_t sb_block;
868 char *options = (char *) *data;
1da177e4
LT		 869
870 if (!options || strncmp(options, "sb=", 3) != 0)
871 return 1; /* Default location */
872 options += 3;
43d23f90 873 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 874 sb_block = simple_strtoul(options, &options, 0);
875 if (*options && *options != ',') {
4cf46b67 876 ext3_msg(sb, "error: invalid sb specification: %s",
1da177e4
LT		 877 (char *) *data);
878 return 1;
879 }
880 if (*options == ',')
881 options++;
882 *data = (void *) options;
883 return sb_block;
884}
885
e1f5c67a
DM		 886#ifdef CONFIG_QUOTA
887static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
888{
889 struct ext3_sb_info *sbi = EXT3_SB(sb);
890 char *qname;
891
892 if (sb_any_quota_loaded(sb) &&
893 !sbi->s_qf_names[qtype]) {
894 ext3_msg(sb, KERN_ERR,
895 "Cannot change journaled "
896 "quota options when quota turned on");
897 return 0;
898 }
899 qname = match_strdup(args);
900 if (!qname) {
901 ext3_msg(sb, KERN_ERR,
902 "Not enough memory for storing quotafile name");
903 return 0;
904 }
905 if (sbi->s_qf_names[qtype] &&
906 strcmp(sbi->s_qf_names[qtype], qname)) {
907 ext3_msg(sb, KERN_ERR,
908 "%s quota file already specified", QTYPE2NAME(qtype));
909 kfree(qname);
910 return 0;
911 }
912 sbi->s_qf_names[qtype] = qname;
913 if (strchr(sbi->s_qf_names[qtype], '/')) {
914 ext3_msg(sb, KERN_ERR,
915 "quotafile must be on filesystem root");
916 kfree(sbi->s_qf_names[qtype]);
917 sbi->s_qf_names[qtype] = NULL;
918 return 0;
919 }
920 set_opt(sbi->s_mount_opt, QUOTA);
921 return 1;
922}
923
924static int clear_qf_name(struct super_block *sb, int qtype) {
925
926 struct ext3_sb_info *sbi = EXT3_SB(sb);
927
928 if (sb_any_quota_loaded(sb) &&
929 sbi->s_qf_names[qtype]) {
930 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
931 " when quota turned on");
932 return 0;
933 }
934 /*
935 * The space will be released later when all options are confirmed
936 * to be correct
937 */
938 sbi->s_qf_names[qtype] = NULL;
939 return 1;
940}
941#endif
942
71b96257 943static int parse_options (char *options, struct super_block *sb,
eee194e7 944 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 945 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 946{
947 struct ext3_sb_info *sbi = EXT3_SB(sb);
948 char * p;
949 substring_t args[MAX_OPT_ARGS];
950 int data_opt = 0;
951 int option;
952#ifdef CONFIG_QUOTA
e1f5c67a 953 int qfmt;
1da177e4
LT		 954#endif
955
956 if (!options)
957 return 1;
958
959 while ((p = strsep (&options, ",")) != NULL) {
960 int token;
961 if (!*p)
962 continue;
0636c73e
ES		 963 /*
964 * Initialize args struct so we know whether arg was
965 * found; some options take optional arguments.
966 */
967 args[0].to = args[0].from = 0;
1da177e4
LT		 968 token = match_token(p, tokens, args);
969 switch (token) {
970 case Opt_bsd_df:
971 clear_opt (sbi->s_mount_opt, MINIX_DF);
972 break;
973 case Opt_minix_df:
974 set_opt (sbi->s_mount_opt, MINIX_DF);
975 break;
976 case Opt_grpid:
977 set_opt (sbi->s_mount_opt, GRPID);
978 break;
979 case Opt_nogrpid:
980 clear_opt (sbi->s_mount_opt, GRPID);
981 break;
982 case Opt_resuid:
983 if (match_int(&args[0], &option))
984 return 0;
985 sbi->s_resuid = option;
986 break;
987 case Opt_resgid:
988 if (match_int(&args[0], &option))
989 return 0;
990 sbi->s_resgid = option;
991 break;
992 case Opt_sb:
993 /* handled by get_sb_block() instead of here */
994 /* *sb_block = match_int(&args[0]); */
995 break;
996 case Opt_err_panic:
997 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
998 clear_opt (sbi->s_mount_opt, ERRORS_RO);
999 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1000 break;
1001 case Opt_err_ro:
1002 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1003 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1004 set_opt (sbi->s_mount_opt, ERRORS_RO);
1005 break;
1006 case Opt_err_cont:
1007 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1008 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1009 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1010 break;
1011 case Opt_nouid32:
1012 set_opt (sbi->s_mount_opt, NO_UID32);
1013 break;
1da177e4
LT		 1014 case Opt_nocheck:
1015 clear_opt (sbi->s_mount_opt, CHECK);
1016 break;
1017 case Opt_debug:
1018 set_opt (sbi->s_mount_opt, DEBUG);
1019 break;
1020 case Opt_oldalloc:
1021 set_opt (sbi->s_mount_opt, OLDALLOC);
1022 break;
1023 case Opt_orlov:
1024 clear_opt (sbi->s_mount_opt, OLDALLOC);
1025 break;
1026#ifdef CONFIG_EXT3_FS_XATTR
1027 case Opt_user_xattr:
1028 set_opt (sbi->s_mount_opt, XATTR_USER);
1029 break;
1030 case Opt_nouser_xattr:
1031 clear_opt (sbi->s_mount_opt, XATTR_USER);
1032 break;
1033#else
1034 case Opt_user_xattr:
1035 case Opt_nouser_xattr:
4cf46b67
AF		 1036 ext3_msg(sb, KERN_INFO,
1037 "(no)user_xattr options not supported");
1da177e4
LT		 1038 break;
1039#endif
1040#ifdef CONFIG_EXT3_FS_POSIX_ACL
1041 case Opt_acl:
1042 set_opt(sbi->s_mount_opt, POSIX_ACL);
1043 break;
1044 case Opt_noacl:
1045 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1046 break;
1047#else
1048 case Opt_acl:
1049 case Opt_noacl:
4cf46b67
AF		 1050 ext3_msg(sb, KERN_INFO,
1051 "(no)acl options not supported");
1da177e4
LT		 1052 break;
1053#endif
1054 case Opt_reservation:
1055 set_opt(sbi->s_mount_opt, RESERVATION);
1056 break;
1057 case Opt_noreservation:
1058 clear_opt(sbi->s_mount_opt, RESERVATION);
1059 break;
1060 case Opt_journal_update:
1061 /* @@@ FIXME */
1062 /* Eventually we will want to be able to create
1063 a journal file here. For now, only allow the
1064 user to specify an existing inode to be the
1065 journal file. */
1066 if (is_remount) {
4cf46b67
AF		 1067 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1068 "journal on remount");
1da177e4
LT		 1069 return 0;
1070 }
1071 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1072 break;
1073 case Opt_journal_inum:
1074 if (is_remount) {
4cf46b67
AF		 1075 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1076 "journal on remount");
1da177e4
LT		 1077 return 0;
1078 }
1079 if (match_int(&args[0], &option))
1080 return 0;
1081 *inum = option;
1082 break;
71b96257
JL		 1083 case Opt_journal_dev:
1084 if (is_remount) {
4cf46b67
AF		 1085 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1086 "journal on remount");
71b96257
JL		 1087 return 0;
1088 }
1089 if (match_int(&args[0], &option))
1090 return 0;
1091 *journal_devnum = option;
1092 break;
1da177e4
LT		 1093 case Opt_noload:
1094 set_opt (sbi->s_mount_opt, NOLOAD);
1095 break;
1096 case Opt_commit:
1097 if (match_int(&args[0], &option))
1098 return 0;
1099 if (option < 0)
1100 return 0;
1101 if (option == 0)
1102 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1103 sbi->s_commit_interval = HZ * option;
1104 break;
1105 case Opt_data_journal:
1106 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1107 goto datacheck;
1108 case Opt_data_ordered:
1109 data_opt = EXT3_MOUNT_ORDERED_DATA;
1110 goto datacheck;
1111 case Opt_data_writeback:
1112 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1113 datacheck:
1114 if (is_remount) {
e3c96435 1115 if (test_opt(sb, DATA_FLAGS) == data_opt)
3c4cec65 1116 break;
4cf46b67
AF		 1117 ext3_msg(sb, KERN_ERR,
1118 "error: cannot change "
3c4cec65
JK		 1119 "data mode on remount. The filesystem "
1120 "is mounted in data=%s mode and you "
4cf46b67 1121 "try to remount it in data=%s mode.",
e3c96435
DM		 1122 data_mode_string(test_opt(sb,
1123 DATA_FLAGS)),
3c4cec65
JK		 1124 data_mode_string(data_opt));
1125 return 0;
1da177e4 1126 } else {
e3c96435 1127 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1da177e4
LT		 1128 sbi->s_mount_opt |= data_opt;
1129 }
1130 break;
0e4fb5e2
HK		 1131 case Opt_data_err_abort:
1132 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1133 break;
1134 case Opt_data_err_ignore:
1135 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1136 break;
1da177e4
LT		 1137#ifdef CONFIG_QUOTA
1138 case Opt_usrjquota:
e1f5c67a 1139 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1da177e4 1140 return 0;
e1f5c67a
DM		 1141 break;
1142 case Opt_grpjquota:
1143 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1da177e4 1144 return 0;
1da177e4
LT		 1145 break;
1146 case Opt_offusrjquota:
e1f5c67a
DM		 1147 if (!clear_qf_name(sb, USRQUOTA))
1148 return 0;
1149 break;
1da177e4 1150 case Opt_offgrpjquota:
e1f5c67a 1151 if (!clear_qf_name(sb, GRPQUOTA))
1da177e4 1152 return 0;
1da177e4
LT		 1153 break;
1154 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1155 qfmt = QFMT_VFS_OLD;
1156 goto set_qf_format;
1da177e4 1157 case Opt_jqfmt_vfsv0:
d06bf1d2 1158 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1159 goto set_qf_format;
1160 case Opt_jqfmt_vfsv1:
1161 qfmt = QFMT_VFS_V1;
d06bf1d2 1162set_qf_format:
ee0d5ffe 1163 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1164 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1165 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1166 "journaled quota options when "
4cf46b67 1167 "quota turned on.");
d06bf1d2
JK		 1168 return 0;
1169 }
1170 sbi->s_jquota_fmt = qfmt;
1da177e4 1171 break;
1f54587b 1172 case Opt_quota:
8fc2751b
MB		 1173 case Opt_usrquota:
1174 set_opt(sbi->s_mount_opt, QUOTA);
1175 set_opt(sbi->s_mount_opt, USRQUOTA);
1176 break;
1177 case Opt_grpquota:
1f54587b 1178 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1179 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1180 break;
1181 case Opt_noquota:
ee0d5ffe 1182 if (sb_any_quota_loaded(sb)) {
4cf46b67
AF		 1183 ext3_msg(sb, KERN_ERR, "error: cannot change "
1184 "quota options when quota turned on.");
1f54587b
JK		 1185 return 0;
1186 }
1187 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1188 clear_opt(sbi->s_mount_opt, USRQUOTA);
1189 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1190 break;
1da177e4 1191#else
8fc2751b
MB		 1192 case Opt_quota:
1193 case Opt_usrquota:
1194 case Opt_grpquota:
4cf46b67
AF		 1195 ext3_msg(sb, KERN_ERR,
1196 "error: quota options not supported.");
fa1ff1e0 1197 break;
1da177e4
LT		 1198 case Opt_usrjquota:
1199 case Opt_grpjquota:
1200 case Opt_offusrjquota:
1201 case Opt_offgrpjquota:
1202 case Opt_jqfmt_vfsold:
1203 case Opt_jqfmt_vfsv0:
1aeec434 1204 case Opt_jqfmt_vfsv1:
4cf46b67
AF		 1205 ext3_msg(sb, KERN_ERR,
1206 "error: journaled quota options not "
1207 "supported.");
1da177e4 1208 break;
1f54587b
JK		 1209 case Opt_noquota:
1210 break;
1da177e4
LT		 1211#endif
1212 case Opt_abort:
1213 set_opt(sbi->s_mount_opt, ABORT);
1214 break;
0636c73e
ES		 1215 case Opt_nobarrier:
1216 clear_opt(sbi->s_mount_opt, BARRIER);
1217 break;
1da177e4 1218 case Opt_barrier:
0636c73e
ES		 1219 if (args[0].from) {
1220 if (match_int(&args[0], &option))
1221 return 0;
1222 } else
1223 option = 1; /* No argument, default to 1 */
1da177e4
LT		 1224 if (option)
1225 set_opt(sbi->s_mount_opt, BARRIER);
1226 else
1227 clear_opt(sbi->s_mount_opt, BARRIER);
1228 break;
1229 case Opt_ignore:
1230 break;
1231 case Opt_resize:
08c6a96f 1232 if (!is_remount) {
4cf46b67
AF		 1233 ext3_msg(sb, KERN_ERR,
1234 "error: resize option only available "
1235 "for remount");
1da177e4
LT		 1236 return 0;
1237 }
c7f1721e
KZ		 1238 if (match_int(&args[0], &option) != 0)
1239 return 0;
1da177e4
LT		 1240 *n_blocks_count = option;
1241 break;
1242 case Opt_nobh:
4c4d3901
CH		 1243 ext3_msg(sb, KERN_WARNING,
1244 "warning: ignoring deprecated nobh option");
1da177e4 1245 break;
ade1a29e 1246 case Opt_bh:
4c4d3901
CH		 1247 ext3_msg(sb, KERN_WARNING,
1248 "warning: ignoring deprecated bh option");
ade1a29e 1249 break;
1da177e4 1250 default:
4cf46b67
AF		 1251 ext3_msg(sb, KERN_ERR,
1252 "error: unrecognized mount option \"%s\" "
1253 "or missing value", p);
1da177e4
LT		 1254 return 0;
1255 }
1256 }
1257#ifdef CONFIG_QUOTA
8fc2751b 1258 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
e3c96435 1259 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
8fc2751b 1260 clear_opt(sbi->s_mount_opt, USRQUOTA);
e3c96435 1261 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
8fc2751b
MB		 1262 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1263
e1f5c67a 1264 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
4cf46b67
AF		 1265 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1266 "format mixing.");
8fc2751b
MB		 1267 return 0;
1268 }
1269
1270 if (!sbi->s_jquota_fmt) {
4cf46b67
AF		 1271 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1272 "not specified.");
8fc2751b
MB		 1273 return 0;
1274 }
1275 } else {
1276 if (sbi->s_jquota_fmt) {
4cf46b67 1277 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
99aeaf63 1278 "specified with no journaling "
4cf46b67 1279 "enabled.");
8fc2751b
MB		 1280 return 0;
1281 }
1da177e4
LT		 1282 }
1283#endif
1da177e4
LT		 1284 return 1;
1285}
1286
1287static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1288 int read_only)
1289{
1290 struct ext3_sb_info *sbi = EXT3_SB(sb);
1291 int res = 0;
1292
1293 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
AF		 1294 ext3_msg(sb, KERN_ERR,
1295 "error: revision level too high, "
1296 "forcing read-only mode");
1da177e4
LT		 1297 res = MS_RDONLY;
1298 }
1299 if (read_only)
1300 return res;
1301 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
AF		 1302 ext3_msg(sb, KERN_WARNING,
1303 "warning: mounting unchecked fs, "
1304 "running e2fsck is recommended");
1da177e4 1305 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
AF		 1306 ext3_msg(sb, KERN_WARNING,
1307 "warning: mounting fs with errors, "
1308 "running e2fsck is recommended");
df0d6b8f 1309 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1da177e4 1310 le16_to_cpu(es->s_mnt_count) >=
df0d6b8f 1311 le16_to_cpu(es->s_max_mnt_count))
4cf46b67
AF		 1312 ext3_msg(sb, KERN_WARNING,
1313 "warning: maximal mount count reached, "
1314 "running e2fsck is recommended");
1da177e4
LT		 1315 else if (le32_to_cpu(es->s_checkinterval) &&
1316 (le32_to_cpu(es->s_lastcheck) +
1317 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
AF		 1318 ext3_msg(sb, KERN_WARNING,
1319 "warning: checktime reached, "
1320 "running e2fsck is recommended");
1da177e4
LT		 1321#if 0
1322 /* @@@ We _will_ want to clear the valid bit if we find
1323 inconsistencies, to force a fsck at reboot. But for
1324 a plain journaled filesystem we can keep it set as
1325 valid forever! :) */
e7f23ebd 1326 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4 1327#endif
df0d6b8f 1328 if (!le16_to_cpu(es->s_max_mnt_count))
1da177e4 1329 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1330 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1331 es->s_mtime = cpu_to_le32(get_seconds());
1332 ext3_update_dynamic_rev(sb);
1333 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1334
1335 ext3_commit_super(sb, es, 1);
1336 if (test_opt(sb, DEBUG))
4cf46b67
AF		 1337 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1338 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1339 sb->s_blocksize,
1340 sbi->s_groups_count,
1341 EXT3_BLOCKS_PER_GROUP(sb),
1342 EXT3_INODES_PER_GROUP(sb),
1343 sbi->s_mount_opt);
1344
1da177e4
LT		 1345 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1346 char b[BDEVNAME_SIZE];
4cf46b67 1347 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1348 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1349 } else {
4cf46b67 1350 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1351 }
1da177e4
LT		 1352 return res;
1353}
1354
1355/* Called at mount-time, super-block is locked */
197cd65a 1356static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1357{
1358 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1359 int i;
1360
1361 ext3_debug ("Checking group descriptors");
1362
197cd65a
AM		 1363 for (i = 0; i < sbi->s_groups_count; i++) {
1364 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1365 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1366 ext3_fsblk_t last_block;
197cd65a 1367
855565e8
ES		 1368 if (i == sbi->s_groups_count - 1)
1369 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1370 else
1371 last_block = first_block +
1372 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1373
855565e8
ES		 1374 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1375 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1376 {
1377 ext3_error (sb, "ext3_check_descriptors",
1378 "Block bitmap for group %d"
1379 " not in group (block %lu)!",
1380 i, (unsigned long)
1381 le32_to_cpu(gdp->bg_block_bitmap));
1382 return 0;
1383 }
855565e8
ES		 1384 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1385 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1386 {
1387 ext3_error (sb, "ext3_check_descriptors",
1388 "Inode bitmap for group %d"
1389 " not in group (block %lu)!",
1390 i, (unsigned long)
1391 le32_to_cpu(gdp->bg_inode_bitmap));
1392 return 0;
1393 }
855565e8 1394 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1395 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1396 last_block)
1da177e4
LT		 1397 {
1398 ext3_error (sb, "ext3_check_descriptors",
1399 "Inode table for group %d"
1400 " not in group (block %lu)!",
1401 i, (unsigned long)
1402 le32_to_cpu(gdp->bg_inode_table));
1403 return 0;
1404 }
1da177e4
LT		 1405 }
1406
1407 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1408 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1409 return 1;
1410}
1411
1412
1413/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1414 * the superblock) which were deleted from all directories, but held open by
1415 * a process at the time of a crash. We walk the list and try to delete these
1416 * inodes at recovery time (only with a read-write filesystem).
1417 *
1418 * In order to keep the orphan inode chain consistent during traversal (in
1419 * case of crash during recovery), we link each inode into the superblock
1420 * orphan list_head and handle it the same way as an inode deletion during
1421 * normal operation (which journals the operations for us).
1422 *
1423 * We only do an iget() and an iput() on each inode, which is very safe if we
1424 * accidentally point at an in-use or already deleted inode. The worst that
1425 * can happen in this case is that we get a "bit already cleared" message from
1426 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1427 * e2fsck was run on this filesystem, and it must have already done the orphan
1428 * inode cleanup for us, so we can safely abort without any further action.
1429 */
1430static void ext3_orphan_cleanup (struct super_block * sb,
1431 struct ext3_super_block * es)
1432{
1433 unsigned int s_flags = sb->s_flags;
1434 int nr_orphans = 0, nr_truncates = 0;
1435#ifdef CONFIG_QUOTA
1436 int i;
1437#endif
1438 if (!es->s_last_orphan) {
1439 jbd_debug(4, "no orphan inodes to clean up\n");
1440 return;
1441 }
1442
a8f48a95 1443 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
AF		 1444 ext3_msg(sb, KERN_ERR, "error: write access "
1445 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1446 return;
1447 }
1448
1da177e4
LT		 1449 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1450 if (es->s_last_orphan)
1451 jbd_debug(1, "Errors on filesystem, "
1452 "clearing orphan list.\n");
1453 es->s_last_orphan = 0;
1454 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1455 return;
1456 }
1457
1458 if (s_flags & MS_RDONLY) {
4cf46b67 1459 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1460 sb->s_flags &= ~MS_RDONLY;
1461 }
1462#ifdef CONFIG_QUOTA
1463 /* Needed for iput() to work correctly and not trash data */
1464 sb->s_flags |= MS_ACTIVE;
1465 /* Turn on quotas so that they are updated correctly */
1466 for (i = 0; i < MAXQUOTAS; i++) {
1467 if (EXT3_SB(sb)->s_qf_names[i]) {
1468 int ret = ext3_quota_on_mount(sb, i);
1469 if (ret < 0)
4cf46b67
AF		 1470 ext3_msg(sb, KERN_ERR,
1471 "error: cannot turn on journaled "
1472 "quota: %d", ret);
1da177e4
LT		 1473 }
1474 }
1475#endif
1476
1477 while (es->s_last_orphan) {
1478 struct inode *inode;
1479
473043dc
DH		 1480 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1481 if (IS_ERR(inode)) {
1da177e4
LT		 1482 es->s_last_orphan = 0;
1483 break;
1484 }
1485
1486 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
871a2931 1487 dquot_initialize(inode);
1da177e4
LT		 1488 if (inode->i_nlink) {
1489 printk(KERN_DEBUG
eee194e7 1490 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1491 __func__, inode->i_ino, inode->i_size);
eee194e7 1492 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1493 inode->i_ino, inode->i_size);
1494 ext3_truncate(inode);
1495 nr_truncates++;
1496 } else {
1497 printk(KERN_DEBUG
eee194e7 1498 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1499 __func__, inode->i_ino);
eee194e7 1500 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1501 inode->i_ino);
1502 nr_orphans++;
1503 }
1504 iput(inode); /* The delete magic happens here! */
1505 }
1506
1507#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1508
1509 if (nr_orphans)
4cf46b67
AF		 1510 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1511 PLURAL(nr_orphans));
1da177e4 1512 if (nr_truncates)
4cf46b67
AF		 1513 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1514 PLURAL(nr_truncates));
1da177e4
LT		 1515#ifdef CONFIG_QUOTA
1516 /* Turn quotas off */
1517 for (i = 0; i < MAXQUOTAS; i++) {
1518 if (sb_dqopt(sb)->files[i])
287a8095 1519 dquot_quota_off(sb, i);
1da177e4
LT		 1520 }
1521#endif
1522 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1523}
1524
1da177e4
LT		 1525/*
1526 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1527 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1528 * We need to be 1 filesystem block less than the 2^32 sector limit.
1529 */
1530static loff_t ext3_max_size(int bits)
1531{
1532 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1533 int meta_blocks;
1534 loff_t upper_limit;
1535
1536 /* This is calculated to be the largest file size for a
1537 * dense, file such that the total number of
1da177e4 1538 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1539 * does not exceed 2^32 -1
1540 * __u32 i_blocks representing the total number of
1541 * 512 bytes blocks of the file
1542 */
1543 upper_limit = (1LL << 32) - 1;
1544
1545 /* total blocks in file system block size */
1546 upper_limit >>= (bits - 9);
1547
1548
1549 /* indirect blocks */
1550 meta_blocks = 1;
1551 /* double indirect blocks */
1552 meta_blocks += 1 + (1LL << (bits-2));
1553 /* tripple indirect blocks */
1554 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1555
1556 upper_limit -= meta_blocks;
1557 upper_limit <<= bits;
1da177e4
LT		 1558
1559 res += 1LL << (bits-2);
1560 res += 1LL << (2*(bits-2));
1561 res += 1LL << (3*(bits-2));
1562 res <<= bits;
1563 if (res > upper_limit)
1564 res = upper_limit;
fe7fdc37
AK		 1565
1566 if (res > MAX_LFS_FILESIZE)
1567 res = MAX_LFS_FILESIZE;
1568
1da177e4
LT		 1569 return res;
1570}
1571
43d23f90
MC		 1572static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1573 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1574 int nr)
1575{
1576 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1577 unsigned long bg, first_meta_bg;
1da177e4
LT		 1578 int has_super = 0;
1579
1da177e4
LT		 1580 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1581
1582 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1583 nr < first_meta_bg)
1584 return (logic_sb_block + nr + 1);
1585 bg = sbi->s_desc_per_block * nr;
1586 if (ext3_bg_has_super(sb, bg))
1587 has_super = 1;
43d23f90 1588 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1589}
1590
1591
1592static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1593{
1594 struct buffer_head * bh;
1595 struct ext3_super_block *es = NULL;
1596 struct ext3_sb_info *sbi;
43d23f90 1597 ext3_fsblk_t block;
4cf46b67 1598 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1599 ext3_fsblk_t logic_sb_block;
1da177e4 1600 unsigned long offset = 0;
eee194e7 1601 unsigned int journal_inum = 0;
71b96257 1602 unsigned long journal_devnum = 0;
1da177e4
LT		 1603 unsigned long def_mount_opts;
1604 struct inode *root;
1605 int blocksize;
1606 int hblock;
1607 int db_count;
1608 int i;
1609 int needs_recovery;
473043dc 1610 int ret = -EINVAL;
1da177e4 1611 __le32 features;
833f4077 1612 int err;
1da177e4 1613
f8314dc6 1614 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1615 if (!sbi)
1616 return -ENOMEM;
5df096d6
PE		 1617
1618 sbi->s_blockgroup_lock =
1619 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1620 if (!sbi->s_blockgroup_lock) {
1621 kfree(sbi);
1622 return -ENOMEM;
1623 }
1da177e4 1624 sb->s_fs_info = sbi;
1da177e4
LT		 1625 sbi->s_mount_opt = 0;
1626 sbi->s_resuid = EXT3_DEF_RESUID;
1627 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1628 sbi->s_sb_block = sb_block;
1da177e4
LT		 1629
1630 unlock_kernel();
1631
1632 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1633 if (!blocksize) {
4cf46b67 1634 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1635 goto out_fail;
1636 }
1637
1638 /*
1639 * The ext3 superblock will not be buffer aligned for other than 1kB
1640 * block sizes. We need to calculate the offset from buffer start.
1641 */
1642 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1643 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1644 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1645 } else {
1646 logic_sb_block = sb_block;
1647 }
1648
1649 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1650 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1651 goto out_fail;
1652 }
1653 /*
1654 * Note: s_es must be initialized as soon as possible because
1655 * some ext3 macro-instructions depend on its value
1656 */
57e94d86 1657 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 1658 sbi->s_es = es;
1659 sb->s_magic = le16_to_cpu(es->s_magic);
1660 if (sb->s_magic != EXT3_SUPER_MAGIC)
1661 goto cantfind_ext3;
1662
1663 /* Set defaults before we parse the mount options */
1664 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1665 if (def_mount_opts & EXT3_DEFM_DEBUG)
1666 set_opt(sbi->s_mount_opt, DEBUG);
1667 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1668 set_opt(sbi->s_mount_opt, GRPID);
1669 if (def_mount_opts & EXT3_DEFM_UID16)
1670 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1671#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1672 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1673 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1674#endif
1675#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1676 if (def_mount_opts & EXT3_DEFM_ACL)
1677 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1678#endif
1da177e4 1679 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
e3c96435 1680 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1da177e4 1681 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
e3c96435 1682 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1da177e4 1683 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
e3c96435 1684 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1da177e4
LT		 1685
1686 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1687 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1688 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1689 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1690 else
1691 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1692
1693 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1694 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1695
1696 set_opt(sbi->s_mount_opt, RESERVATION);
1697
71b96257
JL		 1698 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1699 NULL, 0))
1da177e4
LT		 1700 goto failed_mount;
1701
1702 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 1703 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 1704
1705 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1706 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1707 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1708 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
AF		 1709 ext3_msg(sb, KERN_WARNING,
1710 "warning: feature flags set on rev 0 fs, "
1711 "running e2fsck is recommended");
1da177e4
LT		 1712 /*
1713 * Check feature flags regardless of the revision level, since we
1714 * previously didn't change the revision level when setting the flags,
1715 * so there is a chance incompat flags are set on a rev 0 filesystem.
1716 */
1717 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1718 if (features) {
4cf46b67
AF		 1719 ext3_msg(sb, KERN_ERR,
1720 "error: couldn't mount because of unsupported "
1721 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1722 goto failed_mount;
1723 }
1724 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1725 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
AF		 1726 ext3_msg(sb, KERN_ERR,
1727 "error: couldn't mount RDWR because of unsupported "
1728 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1729 goto failed_mount;
1730 }
1731 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1732
1733 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1734 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
AF		 1735 ext3_msg(sb, KERN_ERR,
1736 "error: couldn't mount because of unsupported "
1737 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1738 goto failed_mount;
1739 }
1740
e1defc4f 1741 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1742 if (sb->s_blocksize != blocksize) {
1743 /*
1744 * Make sure the blocksize for the filesystem is larger
1745 * than the hardware sectorsize for the machine.
1746 */
1747 if (blocksize < hblock) {
4cf46b67
AF		 1748 ext3_msg(sb, KERN_ERR,
1749 "error: fsblocksize %d too small for "
1750 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1751 goto failed_mount;
1752 }
1753
1754 brelse (bh);
0f0a89eb 1755 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
AF		 1756 ext3_msg(sb, KERN_ERR,
1757 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1758 goto out_fail;
1759 }
1da177e4
LT		 1760 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1761 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1762 bh = sb_bread(sb, logic_sb_block);
1763 if (!bh) {
4cf46b67
AF		 1764 ext3_msg(sb, KERN_ERR,
1765 "error: can't read superblock on 2nd try");
1da177e4
LT		 1766 goto failed_mount;
1767 }
57e94d86 1768 es = (struct ext3_super_block *)(bh->b_data + offset);
1da177e4
LT		 1769 sbi->s_es = es;
1770 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
AF		 1771 ext3_msg(sb, KERN_ERR,
1772 "error: magic mismatch");
1da177e4
LT		 1773 goto failed_mount;
1774 }
1775 }
1776
1777 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1778
1779 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1780 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1781 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1782 } else {
1783 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1784 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1785 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1786 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1787 (sbi->s_inode_size > blocksize)) {
4cf46b67
AF		 1788 ext3_msg(sb, KERN_ERR,
1789 "error: unsupported inode size: %d",
1da177e4
LT		 1790 sbi->s_inode_size);
1791 goto failed_mount;
1792 }
1793 }
1794 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1795 le32_to_cpu(es->s_log_frag_size);
1796 if (blocksize != sbi->s_frag_size) {
4cf46b67
AF		 1797 ext3_msg(sb, KERN_ERR,
1798 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1799 sbi->s_frag_size, blocksize);
1800 goto failed_mount;
1801 }
1802 sbi->s_frags_per_block = 1;
1803 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1804 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1805 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1806 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1807 goto cantfind_ext3;
1808 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1809 if (sbi->s_inodes_per_block == 0)
1810 goto cantfind_ext3;
1811 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1812 sbi->s_inodes_per_block;
1813 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1814 sbi->s_sbh = bh;
1815 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1816 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1817 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1818 for (i=0; i < 4; i++)
1819 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1820 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1821 i = le32_to_cpu(es->s_flags);
1822 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1823 sbi->s_hash_unsigned = 3;
1824 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1825#ifdef __CHAR_UNSIGNED__
1826 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1827 sbi->s_hash_unsigned = 3;
1828#else
1829 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1830#endif
5e1f8c9e 1831 }
1da177e4
LT		 1832
1833 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
AF		 1834 ext3_msg(sb, KERN_ERR,
1835 "#blocks per group too big: %lu",
1da177e4
LT		 1836 sbi->s_blocks_per_group);
1837 goto failed_mount;
1838 }
1839 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
AF		 1840 ext3_msg(sb, KERN_ERR,
1841 "error: #fragments per group too big: %lu",
1da177e4
LT		 1842 sbi->s_frags_per_group);
1843 goto failed_mount;
1844 }
1845 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
AF		 1846 ext3_msg(sb, KERN_ERR,
1847 "error: #inodes per group too big: %lu",
1da177e4
LT		 1848 sbi->s_inodes_per_group);
1849 goto failed_mount;
1850 }
1851
fcd5df35
MC		 1852 if (le32_to_cpu(es->s_blocks_count) >
1853 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
4cf46b67
AF		 1854 ext3_msg(sb, KERN_ERR,
1855 "error: filesystem is too large to mount safely");
fcd5df35 1856 if (sizeof(sector_t) < 8)
4cf46b67
AF		 1857 ext3_msg(sb, KERN_ERR,
1858 "error: CONFIG_LBDAF not enabled");
fcd5df35
MC		 1859 goto failed_mount;
1860 }
1861
1da177e4
LT		 1862 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1863 goto cantfind_ext3;
855565e8
ES		 1864 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1865 le32_to_cpu(es->s_first_data_block) - 1)
1866 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
81a4e320 1867 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1868 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1869 GFP_KERNEL);
1870 if (sbi->s_group_desc == NULL) {
4cf46b67
AF		 1871 ext3_msg(sb, KERN_ERR,
1872 "error: not enough memory");
4569cd1b 1873 ret = -ENOMEM;
1da177e4
LT		 1874 goto failed_mount;
1875 }
1876
5df096d6 1877 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1878
1879 for (i = 0; i < db_count; i++) {
1880 block = descriptor_loc(sb, logic_sb_block, i);
1881 sbi->s_group_desc[i] = sb_bread(sb, block);
1882 if (!sbi->s_group_desc[i]) {
4cf46b67
AF		 1883 ext3_msg(sb, KERN_ERR,
1884 "error: can't read group descriptor %d", i);
1da177e4
LT		 1885 db_count = i;
1886 goto failed_mount2;
1887 }
1888 }
1889 if (!ext3_check_descriptors (sb)) {
4cf46b67
AF		 1890 ext3_msg(sb, KERN_ERR,
1891 "error: group descriptors corrupted");
1da177e4
LT		 1892 goto failed_mount2;
1893 }
1894 sbi->s_gdb_count = db_count;
1895 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1896 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1897
1da177e4
LT		 1898 /* per fileystem reservation list head & lock */
1899 spin_lock_init(&sbi->s_rsv_window_lock);
1900 sbi->s_rsv_window_root = RB_ROOT;
1901 /* Add a single, static dummy reservation to the start of the
1902 * reservation window list --- it gives us a placeholder for
1903 * append-at-start-of-list which makes the allocation logic
1904 * _much_ simpler. */
1905 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1906 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1907 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1908 sbi->s_rsv_window_head.rsv_goal_size = 0;
1909 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1910
1911 /*
1912 * set up enough so that it can read an inode
1913 */
1914 sb->s_op = &ext3_sops;
1915 sb->s_export_op = &ext3_export_ops;
1916 sb->s_xattr = ext3_xattr_handlers;
1917#ifdef CONFIG_QUOTA
1918 sb->s_qcop = &ext3_qctl_operations;
1919 sb->dq_op = &ext3_quota_operations;
1920#endif
1921 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 1922 mutex_init(&sbi->s_orphan_lock);
96d2a495 1923 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 1924
1925 sb->s_root = NULL;
1926
1927 needs_recovery = (es->s_last_orphan != 0 ||
1928 EXT3_HAS_INCOMPAT_FEATURE(sb,
1929 EXT3_FEATURE_INCOMPAT_RECOVER));
1930
1931 /*
1932 * The first inode we look at is the journal inode. Don't try
1933 * root first: it may be modified in the journal!
1934 */
1935 if (!test_opt(sb, NOLOAD) &&
1936 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1937 if (ext3_load_journal(sb, es, journal_devnum))
41d1a636 1938 goto failed_mount2;
1da177e4
LT		 1939 } else if (journal_inum) {
1940 if (ext3_create_journal(sb, es, journal_inum))
41d1a636 1941 goto failed_mount2;
1da177e4
LT		 1942 } else {
1943 if (!silent)
4cf46b67
AF		 1944 ext3_msg(sb, KERN_ERR,
1945 "error: no journal found. "
1946 "mounting ext3 over ext2?");
41d1a636
DM		 1947 goto failed_mount2;
1948 }
1949 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1950 ext3_count_free_blocks(sb));
1951 if (!err) {
1952 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1953 ext3_count_free_inodes(sb));
1954 }
1955 if (!err) {
1956 err = percpu_counter_init(&sbi->s_dirs_counter,
1957 ext3_count_dirs(sb));
1958 }
1959 if (err) {
1960 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
4569cd1b 1961 ret = err;
0216bfcf 1962 goto failed_mount3;
1da177e4
LT		 1963 }
1964
1965 /* We have now updated the journal if required, so we can
1966 * validate the data journaling mode. */
1967 switch (test_opt(sb, DATA_FLAGS)) {
1968 case 0:
1969 /* No mode set, assume a default based on the journal
1970 capabilities: ORDERED_DATA if the journal can
1971 cope, else JOURNAL_DATA */
1972 if (journal_check_available_features
1973 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 1974 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 1975 else
1976 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1977 break;
1978
1979 case EXT3_MOUNT_ORDERED_DATA:
1980 case EXT3_MOUNT_WRITEBACK_DATA:
1981 if (!journal_check_available_features
1982 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
AF		 1983 ext3_msg(sb, KERN_ERR,
1984 "error: journal does not support "
1985 "requested data journaling mode");
41d1a636 1986 goto failed_mount3;
1da177e4
LT		 1987 }
1988 default:
1989 break;
1990 }
1991
1da177e4
LT		 1992 /*
1993 * The journal_load will have done any necessary log recovery,
1994 * so we can safely mount the rest of the filesystem now.
1995 */
1996
473043dc
DH		 1997 root = ext3_iget(sb, EXT3_ROOT_INO);
1998 if (IS_ERR(root)) {
4cf46b67 1999 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 2000 ret = PTR_ERR(root);
41d1a636 2001 goto failed_mount3;
1da177e4
LT		 2002 }
2003 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2004 iput(root);
4cf46b67 2005 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
41d1a636 2006 goto failed_mount3;
1da177e4 2007 }
473043dc
DH		 2008 sb->s_root = d_alloc_root(root);
2009 if (!sb->s_root) {
4cf46b67 2010 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc
DH		 2011 iput(root);
2012 ret = -ENOMEM;
41d1a636 2013 goto failed_mount3;
473043dc 2014 }
1da177e4
LT		 2015
2016 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ed505ee4 2017
1da177e4
LT		 2018 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2019 ext3_orphan_cleanup(sb, es);
2020 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2021 if (needs_recovery)
4cf46b67 2022 ext3_msg(sb, KERN_INFO, "recovery complete");
1da177e4 2023 ext3_mark_recovery_complete(sb, es);
4cf46b67 2024 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2025 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2026 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2027 "writeback");
2028
1da177e4
LT		 2029 lock_kernel();
2030 return 0;
2031
2032cantfind_ext3:
2033 if (!silent)
4cf46b67
AF		 2034 ext3_msg(sb, KERN_INFO,
2035 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2036 sb->s_id);
2037 goto failed_mount;
2038
0216bfcf
MC		 2039failed_mount3:
2040 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2041 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2042 percpu_counter_destroy(&sbi->s_dirs_counter);
41d1a636 2043 journal_destroy(sbi->s_journal);
1da177e4
LT		 2044failed_mount2:
2045 for (i = 0; i < db_count; i++)
2046 brelse(sbi->s_group_desc[i]);
2047 kfree(sbi->s_group_desc);
2048failed_mount:
2049#ifdef CONFIG_QUOTA
2050 for (i = 0; i < MAXQUOTAS; i++)
2051 kfree(sbi->s_qf_names[i]);
2052#endif
2053 ext3_blkdev_remove(sbi);
2054 brelse(bh);
2055out_fail:
2056 sb->s_fs_info = NULL;
de5ce037 2057 kfree(sbi->s_blockgroup_lock);
1da177e4
LT		 2058 kfree(sbi);
2059 lock_kernel();
473043dc 2060 return ret;
1da177e4
LT		 2061}
2062
2063/*
2064 * Setup any per-fs journal parameters now. We'll do this both on
2065 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2066 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2067 */
2068static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2069{
2070 struct ext3_sb_info *sbi = EXT3_SB(sb);
2071
2072 if (sbi->s_commit_interval)
2073 journal->j_commit_interval = sbi->s_commit_interval;
2074 /* We could also set up an ext3-specific default for the commit
2075 * interval here, but for now we'll just fall back to the jbd
2076 * default. */
2077
2078 spin_lock(&journal->j_state_lock);
2079 if (test_opt(sb, BARRIER))
2080 journal->j_flags |= JFS_BARRIER;
2081 else
2082 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2083 if (test_opt(sb, DATA_ERR_ABORT))
2084 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2085 else
2086 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2087 spin_unlock(&journal->j_state_lock);
2088}
2089
eee194e7
ES		 2090static journal_t *ext3_get_journal(struct super_block *sb,
2091 unsigned int journal_inum)
1da177e4
LT		 2092{
2093 struct inode *journal_inode;
2094 journal_t *journal;
2095
2096 /* First, test for the existence of a valid inode on disk. Bad
2097 * things happen if we iget() an unused inode, as the subsequent
2098 * iput() will try to delete it. */
2099
473043dc
DH		 2100 journal_inode = ext3_iget(sb, journal_inum);
2101 if (IS_ERR(journal_inode)) {
4cf46b67 2102 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2103 return NULL;
2104 }
2105 if (!journal_inode->i_nlink) {
2106 make_bad_inode(journal_inode);
2107 iput(journal_inode);
4cf46b67 2108 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2109 return NULL;
2110 }
2111
2112 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2113 journal_inode, journal_inode->i_size);
473043dc 2114 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2115 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2116 iput(journal_inode);
2117 return NULL;
2118 }
2119
2120 journal = journal_init_inode(journal_inode);
2121 if (!journal) {
4cf46b67 2122 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2123 iput(journal_inode);
2124 return NULL;
2125 }
2126 journal->j_private = sb;
2127 ext3_init_journal_params(sb, journal);
2128 return journal;
2129}
2130
2131static journal_t *ext3_get_dev_journal(struct super_block *sb,
2132 dev_t j_dev)
2133{
2134 struct buffer_head * bh;
2135 journal_t *journal;
43d23f90 2136 ext3_fsblk_t start;
1c2bf374 2137 ext3_fsblk_t len;
1da177e4 2138 int hblock, blocksize;
43d23f90 2139 ext3_fsblk_t sb_block;
1da177e4
LT		 2140 unsigned long offset;
2141 struct ext3_super_block * es;
2142 struct block_device *bdev;
2143
4cf46b67 2144 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2145 if (bdev == NULL)
2146 return NULL;
2147
2148 if (bd_claim(bdev, sb)) {
4cf46b67
AF		 2149 ext3_msg(sb, KERN_ERR,
2150 "error: failed to claim external journal device");
9a1c3542 2151 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 2152 return NULL;
2153 }
2154
2155 blocksize = sb->s_blocksize;
e1defc4f 2156 hblock = bdev_logical_block_size(bdev);
1da177e4 2157 if (blocksize < hblock) {
4cf46b67
AF		 2158 ext3_msg(sb, KERN_ERR,
2159 "error: blocksize too small for journal device");
1da177e4
LT		 2160 goto out_bdev;
2161 }
2162
2163 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2164 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2165 set_blocksize(bdev, blocksize);
2166 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
AF		 2167 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2168 "external journal");
1da177e4
LT		 2169 goto out_bdev;
2170 }
2171
57e94d86 2172 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 2173 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2174 !(le32_to_cpu(es->s_feature_incompat) &
2175 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
AF		 2176 ext3_msg(sb, KERN_ERR, "error: external journal has "
2177 "bad superblock");
1da177e4
LT		 2178 brelse(bh);
2179 goto out_bdev;
2180 }
2181
2182 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2183 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2184 brelse(bh);
2185 goto out_bdev;
2186 }
2187
2188 len = le32_to_cpu(es->s_blocks_count);
2189 start = sb_block + 1;
2190 brelse(bh); /* we're done with the superblock */
2191
2192 journal = journal_init_dev(bdev, sb->s_bdev,
2193 start, len, blocksize);
2194 if (!journal) {
4cf46b67
AF		 2195 ext3_msg(sb, KERN_ERR,
2196 "error: failed to create device journal");
1da177e4
LT		 2197 goto out_bdev;
2198 }
2199 journal->j_private = sb;
2200 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2201 wait_on_buffer(journal->j_sb_buffer);
2202 if (!buffer_uptodate(journal->j_sb_buffer)) {
4cf46b67 2203 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
1da177e4
LT		 2204 goto out_journal;
2205 }
2206 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
AF		 2207 ext3_msg(sb, KERN_ERR,
2208 "error: external journal has more than one "
2209 "user (unsupported) - %d",
1da177e4
LT		 2210 be32_to_cpu(journal->j_superblock->s_nr_users));
2211 goto out_journal;
2212 }
2213 EXT3_SB(sb)->journal_bdev = bdev;
2214 ext3_init_journal_params(sb, journal);
2215 return journal;
2216out_journal:
2217 journal_destroy(journal);
2218out_bdev:
2219 ext3_blkdev_put(bdev);
2220 return NULL;
2221}
2222
71b96257
JL		 2223static int ext3_load_journal(struct super_block *sb,
2224 struct ext3_super_block *es,
2225 unsigned long journal_devnum)
1da177e4
LT		 2226{
2227 journal_t *journal;
eee194e7 2228 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2229 dev_t journal_dev;
1da177e4
LT		 2230 int err = 0;
2231 int really_read_only;
2232
71b96257
JL		 2233 if (journal_devnum &&
2234 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
AF		 2235 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2236 "numbers have changed");
71b96257
JL		 2237 journal_dev = new_decode_dev(journal_devnum);
2238 } else
2239 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2240
1da177e4
LT		 2241 really_read_only = bdev_read_only(sb->s_bdev);
2242
2243 /*
2244 * Are we loading a blank journal or performing recovery after a
2245 * crash? For recovery, we need to check in advance whether we
2246 * can get read-write access to the device.
2247 */
2248
2249 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2250 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2251 ext3_msg(sb, KERN_INFO,
2252 "recovery required on readonly filesystem");
1da177e4 2253 if (really_read_only) {
4cf46b67
AF		 2254 ext3_msg(sb, KERN_ERR, "error: write access "
2255 "unavailable, cannot proceed");
1da177e4
LT		 2256 return -EROFS;
2257 }
4cf46b67
AF		 2258 ext3_msg(sb, KERN_INFO,
2259 "write access will be enabled during recovery");
1da177e4
LT		 2260 }
2261 }
2262
2263 if (journal_inum && journal_dev) {
4cf46b67
AF		 2264 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2265 "and inode journals");
1da177e4
LT		 2266 return -EINVAL;
2267 }
2268
2269 if (journal_inum) {
2270 if (!(journal = ext3_get_journal(sb, journal_inum)))
2271 return -EINVAL;
2272 } else {
2273 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2274 return -EINVAL;
2275 }
2276
0636c73e
ES		 2277 if (!(journal->j_flags & JFS_BARRIER))
2278 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2279
1da177e4
LT		 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;
dff6825e
DW		 2365
2366 if (buffer_write_io_error(sbh)) {
2367 /*
2368 * Oh, dear. A previous attempt to write the
2369 * superblock failed. This could happen because the
2370 * USB device was yanked out. Or it could happen to
2371 * be a transient write error and maybe the block will
2372 * be remapped. Nothing we can do but to retry the
2373 * write and hope for the best.
2374 */
2375 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2376 "superblock detected");
2377 clear_buffer_write_io_error(sbh);
2378 set_buffer_uptodate(sbh);
2379 }
96ec2e0a
TT		 2380 /*
2381 * If the file system is mounted read-only, don't update the
2382 * superblock write time. This avoids updating the superblock
2383 * write time when we are mounting the root file system
2384 * read/only but we need to replay the journal; at that point,
2385 * for people who are east of GMT and who make their clock
2386 * tick in localtime for Windows bug-for-bug compatibility,
2387 * the clock is set in the future, and this will cause e2fsck
2388 * to complain and force a full file system check.
2389 */
2390 if (!(sb->s_flags & MS_RDONLY))
2391 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2392 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2393 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2394 BUFFER_TRACE(sbh, "marking dirty");
2395 mark_buffer_dirty(sbh);
dff6825e 2396 if (sync) {
c4be0c1d 2397 error = sync_dirty_buffer(sbh);
dff6825e
DW		 2398 if (buffer_write_io_error(sbh)) {
2399 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2400 "superblock");
2401 clear_buffer_write_io_error(sbh);
2402 set_buffer_uptodate(sbh);
2403 }
2404 }
c4be0c1d 2405 return error;
1da177e4
LT		 2406}
2407
2408
2409/*
2410 * Have we just finished recovery? If so, and if we are mounting (or
2411 * remounting) the filesystem readonly, then we will end up with a
2412 * consistent fs on disk. Record that fact.
2413 */
2414static void ext3_mark_recovery_complete(struct super_block * sb,
2415 struct ext3_super_block * es)
2416{
2417 journal_t *journal = EXT3_SB(sb)->s_journal;
2418
2419 journal_lock_updates(journal);
2d7c820e
HK		 2420 if (journal_flush(journal) < 0)
2421 goto out;
2422
1da177e4
LT		 2423 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2424 sb->s_flags & MS_RDONLY) {
2425 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2426 ext3_commit_super(sb, es, 1);
2427 }
2d7c820e
HK		 2428
2429out:
1da177e4
LT		 2430 journal_unlock_updates(journal);
2431}
2432
2433/*
2434 * If we are mounting (or read-write remounting) a filesystem whose journal
2435 * has recorded an error from a previous lifetime, move that error to the
2436 * main filesystem now.
2437 */
4cf46b67
AF		 2438static void ext3_clear_journal_err(struct super_block *sb,
2439 struct ext3_super_block *es)
1da177e4
LT		 2440{
2441 journal_t *journal;
2442 int j_errno;
2443 const char *errstr;
2444
2445 journal = EXT3_SB(sb)->s_journal;
2446
2447 /*
2448 * Now check for any error status which may have been recorded in the
2449 * journal by a prior ext3_error() or ext3_abort()
2450 */
2451
2452 j_errno = journal_errno(journal);
2453 if (j_errno) {
2454 char nbuf[16];
2455
2456 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2457 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2458 "from previous mount: %s", errstr);
e05b6b52 2459 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2460 "filesystem check.");
2461
2462 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2463 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2464 ext3_commit_super (sb, es, 1);
2465
2466 journal_clear_err(journal);
2467 }
2468}
2469
2470/*
2471 * Force the running and committing transactions to commit,
2472 * and wait on the commit.
2473 */
2474int ext3_force_commit(struct super_block *sb)
2475{
2476 journal_t *journal;
2477 int ret;
2478
2479 if (sb->s_flags & MS_RDONLY)
2480 return 0;
2481
2482 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2483 ret = ext3_journal_force_commit(journal);
2484 return ret;
2485}
2486
1da177e4
LT		 2487static int ext3_sync_fs(struct super_block *sb, int wait)
2488{
02ac597c 2489 tid_t target;
c87591b7 2490
02ac597c
JK		 2491 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2492 if (wait)
2493 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2494 }
1da177e4
LT		 2495 return 0;
2496}
2497
2498/*
2499 * LVM calls this function before a (read-only) snapshot is created. This
2500 * gives us a chance to flush the journal completely and mark the fs clean.
2501 */
c4be0c1d 2502static int ext3_freeze(struct super_block *sb)
1da177e4 2503{
c4be0c1d
TS		 2504 int error = 0;
2505 journal_t *journal;
1da177e4
LT		 2506
2507 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2508 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2509
2510 /* Now we set up the journal barrier. */
2511 journal_lock_updates(journal);
2d7c820e
HK		 2512
2513 /*
2514 * We don't want to clear needs_recovery flag when we failed
2515 * to flush the journal.
2516 */
c4be0c1d
TS		 2517 error = journal_flush(journal);
2518 if (error < 0)
2519 goto out;
1da177e4
LT		 2520
2521 /* Journal blocked and flushed, clear needs_recovery flag. */
2522 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2523 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2524 if (error)
2525 goto out;
1da177e4 2526 }
c4be0c1d
TS		 2527 return 0;
2528
2529out:
2530 journal_unlock_updates(journal);
2531 return error;
1da177e4
LT		 2532}
2533
2534/*
2535 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2536 * flag here, even though the filesystem is not technically dirty yet.
2537 */
c4be0c1d 2538static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2539{
2540 if (!(sb->s_flags & MS_RDONLY)) {
2541 lock_super(sb);
2542 /* Reser the needs_recovery flag before the fs is unlocked. */
2543 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2544 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2545 unlock_super(sb);
2546 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2547 }
c4be0c1d 2548 return 0;
1da177e4
LT		 2549}
2550
2551static int ext3_remount (struct super_block * sb, int * flags, char * data)
2552{
2553 struct ext3_super_block * es;
2554 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2555 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2556 unsigned long old_sb_flags;
2557 struct ext3_mount_options old_opts;
c79d967d 2558 int enable_quota = 0;
08c6a96f
JK		 2559 int err;
2560#ifdef CONFIG_QUOTA
2561 int i;
2562#endif
2563
337eb00a
AIB		 2564 lock_kernel();
2565
08c6a96f 2566 /* Store the original options */
bbd6851a 2567 lock_super(sb);
08c6a96f
JK		 2568 old_sb_flags = sb->s_flags;
2569 old_opts.s_mount_opt = sbi->s_mount_opt;
2570 old_opts.s_resuid = sbi->s_resuid;
2571 old_opts.s_resgid = sbi->s_resgid;
2572 old_opts.s_commit_interval = sbi->s_commit_interval;
2573#ifdef CONFIG_QUOTA
2574 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2575 for (i = 0; i < MAXQUOTAS; i++)
2576 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2577#endif
1da177e4
LT		 2578
2579 /*
2580 * Allow the "check" option to be passed as a remount option.
2581 */
71b96257 2582 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2583 err = -EINVAL;
2584 goto restore_opts;
2585 }
1da177e4 2586
e3c96435 2587 if (test_opt(sb, ABORT))
e05b6b52 2588 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2589
2590 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 2591 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 2592
2593 es = sbi->s_es;
2594
2595 ext3_init_journal_params(sb, sbi->s_journal);
2596
2597 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2598 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
e3c96435 2599 if (test_opt(sb, ABORT)) {
08c6a96f
JK		 2600 err = -EROFS;
2601 goto restore_opts;
2602 }
1da177e4
LT		 2603
2604 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 2605 err = dquot_suspend(sb, -1);
2606 if (err < 0)
c79d967d 2607 goto restore_opts;
c79d967d 2608
1da177e4
LT		 2609 /*
2610 * First of all, the unconditional stuff we have to do
2611 * to disable replay of the journal when we next remount
2612 */
2613 sb->s_flags |= MS_RDONLY;
2614
2615 /*
2616 * OK, test if we are remounting a valid rw partition
2617 * readonly, and if so set the rdonly flag and then
2618 * mark the partition as valid again.
2619 */
2620 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2621 (sbi->s_mount_state & EXT3_VALID_FS))
2622 es->s_state = cpu_to_le16(sbi->s_mount_state);
2623
2624 ext3_mark_recovery_complete(sb, es);
2625 } else {
2626 __le32 ret;
2627 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2628 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
AF		 2629 ext3_msg(sb, KERN_WARNING,
2630 "warning: couldn't remount RDWR "
2631 "because of unsupported optional "
2632 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2633 err = -EROFS;
2634 goto restore_opts;
1da177e4 2635 }
ea9a05a1
ES		 2636
2637 /*
2638 * If we have an unprocessed orphan list hanging
2639 * around from a previously readonly bdev mount,
2640 * require a full umount/remount for now.
2641 */
2642 if (es->s_last_orphan) {
4cf46b67 2643 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2644 "remount RDWR because of unprocessed "
2645 "orphan inode list. Please "
4cf46b67 2646 "umount/remount instead.");
ea9a05a1
ES		 2647 err = -EINVAL;
2648 goto restore_opts;
2649 }
2650
1da177e4
LT		 2651 /*
2652 * Mounting a RDONLY partition read-write, so reread
2653 * and store the current valid flag. (It may have
2654 * been changed by e2fsck since we originally mounted
2655 * the partition.)
2656 */
2657 ext3_clear_journal_err(sb, es);
2658 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2659 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2660 goto restore_opts;
1da177e4
LT		 2661 if (!ext3_setup_super (sb, es, 0))
2662 sb->s_flags &= ~MS_RDONLY;
c79d967d 2663 enable_quota = 1;
1da177e4
LT		 2664 }
2665 }
08c6a96f
JK		 2666#ifdef CONFIG_QUOTA
2667 /* Release old quota file names */
2668 for (i = 0; i < MAXQUOTAS; i++)
2669 if (old_opts.s_qf_names[i] &&
2670 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2671 kfree(old_opts.s_qf_names[i]);
2672#endif
bbd6851a 2673 unlock_super(sb);
337eb00a 2674 unlock_kernel();
c79d967d
CH		 2675
2676 if (enable_quota)
0f0dd62f 2677 dquot_resume(sb, -1);
1da177e4 2678 return 0;
08c6a96f
JK		 2679restore_opts:
2680 sb->s_flags = old_sb_flags;
2681 sbi->s_mount_opt = old_opts.s_mount_opt;
2682 sbi->s_resuid = old_opts.s_resuid;
2683 sbi->s_resgid = old_opts.s_resgid;
2684 sbi->s_commit_interval = old_opts.s_commit_interval;
2685#ifdef CONFIG_QUOTA
2686 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2687 for (i = 0; i < MAXQUOTAS; i++) {
2688 if (sbi->s_qf_names[i] &&
2689 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2690 kfree(sbi->s_qf_names[i]);
2691 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2692 }
2693#endif
bbd6851a 2694 unlock_super(sb);
337eb00a 2695 unlock_kernel();
08c6a96f 2696 return err;
1da177e4
LT		 2697}
2698
726c3342 2699static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2700{
726c3342 2701 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2702 struct ext3_sb_info *sbi = EXT3_SB(sb);
2703 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2704 u64 fsid;
1da177e4 2705
a71ce8c6
BP		 2706 if (test_opt(sb, MINIX_DF)) {
2707 sbi->s_overhead_last = 0;
2708 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2709 unsigned long ngroups = sbi->s_groups_count, i;
2710 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2711 smp_rmb();
2712
2713 /*
a71ce8c6
BP		 2714 * Compute the overhead (FS structures). This is constant
2715 * for a given filesystem unless the number of block groups
2716 * changes so we cache the previous value until it does.
1da177e4
LT		 2717 */
2718
2719 /*
2720 * All of the blocks before first_data_block are
2721 * overhead
2722 */
2723 overhead = le32_to_cpu(es->s_first_data_block);
2724
2725 /*
2726 * Add the overhead attributed to the superblock and
2727 * block group descriptors. If the sparse superblocks
2728 * feature is turned on, then not all groups have this.
2729 */
2730 for (i = 0; i < ngroups; i++) {
2731 overhead += ext3_bg_has_super(sb, i) +
2732 ext3_bg_num_gdb(sb, i);
2733 cond_resched();
2734 }
2735
2736 /*
2737 * Every block group has an inode bitmap, a block
2738 * bitmap, and an inode table.
2739 */
a71ce8c6
BP		 2740 overhead += ngroups * (2 + sbi->s_itb_per_group);
2741 sbi->s_overhead_last = overhead;
2742 smp_wmb();
2743 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2744 }
2745
2746 buf->f_type = EXT3_SUPER_MAGIC;
2747 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2748 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2749 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2750 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2751 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2752 buf->f_bavail = 0;
2753 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2754 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2755 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2756 fsid = le64_to_cpup((void *)es->s_uuid) ^
2757 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2758 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2759 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2760 return 0;
2761}
2762
2763/* Helper function for writing quotas on sync - we need to start transaction before quota file
2764 * is locked for write. Otherwise the are possible deadlocks:
2765 * Process 1 Process 2
2766 * ext3_create() quota_sync()
2767 * journal_start() write_dquot()
871a2931 2768 * dquot_initialize() down(dqio_mutex)
d3be915f 2769 * down(dqio_mutex) journal_start()
1da177e4
LT		 2770 *
2771 */
2772
2773#ifdef CONFIG_QUOTA
2774
2775static inline struct inode *dquot_to_inode(struct dquot *dquot)
2776{
2777 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2778}
2779
1da177e4
LT		 2780static int ext3_write_dquot(struct dquot *dquot)
2781{
2782 int ret, err;
2783 handle_t *handle;
2784 struct inode *inode;
2785
2786 inode = dquot_to_inode(dquot);
2787 handle = ext3_journal_start(inode,
1f54587b 2788 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2789 if (IS_ERR(handle))
2790 return PTR_ERR(handle);
2791 ret = dquot_commit(dquot);
2792 err = ext3_journal_stop(handle);
2793 if (!ret)
2794 ret = err;
2795 return ret;
2796}
2797
2798static int ext3_acquire_dquot(struct dquot *dquot)
2799{
2800 int ret, err;
2801 handle_t *handle;
2802
2803 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2804 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2805 if (IS_ERR(handle))
2806 return PTR_ERR(handle);
2807 ret = dquot_acquire(dquot);
2808 err = ext3_journal_stop(handle);
2809 if (!ret)
2810 ret = err;
2811 return ret;
2812}
2813
2814static int ext3_release_dquot(struct dquot *dquot)
2815{
2816 int ret, err;
2817 handle_t *handle;
2818
2819 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2820 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2821 if (IS_ERR(handle)) {
2822 /* Release dquot anyway to avoid endless cycle in dqput() */
2823 dquot_release(dquot);
1da177e4 2824 return PTR_ERR(handle);
9c3013e9 2825 }
1da177e4
LT		 2826 ret = dquot_release(dquot);
2827 err = ext3_journal_stop(handle);
2828 if (!ret)
2829 ret = err;
2830 return ret;
2831}
2832
2833static int ext3_mark_dquot_dirty(struct dquot *dquot)
2834{
99aeaf63 2835 /* Are we journaling quotas? */
1da177e4
LT		 2836 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2837 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2838 dquot_mark_dquot_dirty(dquot);
2839 return ext3_write_dquot(dquot);
2840 } else {
2841 return dquot_mark_dquot_dirty(dquot);
2842 }
2843}
2844
2845static int ext3_write_info(struct super_block *sb, int type)
2846{
2847 int ret, err;
2848 handle_t *handle;
2849
2850 /* Data block + inode block */
2851 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2852 if (IS_ERR(handle))
2853 return PTR_ERR(handle);
2854 ret = dquot_commit_info(sb, type);
2855 err = ext3_journal_stop(handle);
2856 if (!ret)
2857 ret = err;
2858 return ret;
2859}
2860
2861/*
2862 * Turn on quotas during mount time - we need to find
2863 * the quota file and such...
2864 */
2865static int ext3_quota_on_mount(struct super_block *sb, int type)
2866{
287a8095
CH		 2867 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2868 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2869}
2870
2871/*
2872 * Standard function to be called on quota_on
2873 */
2874static int ext3_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 2875 char *name)
1da177e4
LT		 2876{
2877 int err;
8264613d 2878 struct path path;
1da177e4 2879
1f54587b
JK		 2880 if (!test_opt(sb, QUOTA))
2881 return -EINVAL;
9cfe7b90 2882
8264613d 2883 err = kern_path(name, LOOKUP_FOLLOW, &path);
1da177e4
LT		 2884 if (err)
2885 return err;
9cfe7b90 2886
1da177e4 2887 /* Quotafile not on the same filesystem? */
8264613d
AV		 2888 if (path.mnt->mnt_sb != sb) {
2889 path_put(&path);
1da177e4
LT		 2890 return -EXDEV;
2891 }
9cfe7b90
JK		 2892 /* Journaling quota? */
2893 if (EXT3_SB(sb)->s_qf_names[type]) {
2894 /* Quotafile not of fs root? */
8264613d 2895 if (path.dentry->d_parent != sb->s_root)
4cf46b67
AF		 2896 ext3_msg(sb, KERN_WARNING,
2897 "warning: Quota file not on filesystem root. "
2898 "Journaled quota will not work.");
9cfe7b90
JK		 2899 }
2900
2901 /*
2902 * When we journal data on quota file, we have to flush journal to see
2903 * all updates to the file when we bypass pagecache...
2904 */
8264613d 2905 if (ext3_should_journal_data(path.dentry->d_inode)) {
9cfe7b90
JK		 2906 /*
2907 * We don't need to lock updates but journal_flush() could
2908 * otherwise be livelocked...
2909 */
2910 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2911 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2912 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2913 if (err) {
12e1ec9f 2914 path_put(&path);
2d7c820e
HK		 2915 return err;
2916 }
9cfe7b90
JK		 2917 }
2918
287a8095 2919 err = dquot_quota_on_path(sb, type, format_id, &path);
8264613d 2920 path_put(&path);
77e69dac 2921 return err;
1da177e4
LT		 2922}
2923
2924/* Read data from quotafile - avoid pagecache and such because we cannot afford
2925 * acquiring the locks... As quota files are never truncated and quota code
2926 * itself serializes the operations (and noone else should touch the files)
2927 * we don't have to be afraid of races */
2928static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2929 size_t len, loff_t off)
2930{
2931 struct inode *inode = sb_dqopt(sb)->files[type];
2932 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2933 int err = 0;
2934 int offset = off & (sb->s_blocksize - 1);
2935 int tocopy;
2936 size_t toread;
2937 struct buffer_head *bh;
2938 loff_t i_size = i_size_read(inode);
2939
2940 if (off > i_size)
2941 return 0;
2942 if (off+len > i_size)
2943 len = i_size-off;
2944 toread = len;
2945 while (toread > 0) {
2946 tocopy = sb->s_blocksize - offset < toread ?
2947 sb->s_blocksize - offset : toread;
2948 bh = ext3_bread(NULL, inode, blk, 0, &err);
2949 if (err)
2950 return err;
2951 if (!bh) /* A hole? */
2952 memset(data, 0, tocopy);
2953 else
2954 memcpy(data, bh->b_data+offset, tocopy);
2955 brelse(bh);
2956 offset = 0;
2957 toread -= tocopy;
2958 data += tocopy;
2959 blk++;
2960 }
2961 return len;
2962}
2963
2964/* Write to quotafile (we know the transaction is already started and has
2965 * enough credits) */
2966static ssize_t ext3_quota_write(struct super_block *sb, int type,
2967 const char *data, size_t len, loff_t off)
2968{
2969 struct inode *inode = sb_dqopt(sb)->files[type];
2970 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2971 int err = 0;
2972 int offset = off & (sb->s_blocksize - 1);
1da177e4 2973 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
1da177e4
LT		 2974 struct buffer_head *bh;
2975 handle_t *handle = journal_current_handle();
2976
9c3013e9 2977 if (!handle) {
4cf46b67
AF		 2978 ext3_msg(sb, KERN_WARNING,
2979 "warning: quota write (off=%llu, len=%llu)"
2980 " cancelled because transaction is not started.",
9c3013e9
JK		 2981 (unsigned long long)off, (unsigned long long)len);
2982 return -EIO;
2983 }
e5472147
DM		 2984
2985 /*
2986 * Since we account only one data block in transaction credits,
2987 * then it is impossible to cross a block boundary.
2988 */
2989 if (sb->s_blocksize - offset < len) {
2990 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2991 " cancelled because not block aligned",
2992 (unsigned long long)off, (unsigned long long)len);
2993 return -EIO;
2994 }
5c81a419 2995 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
e5472147
DM		 2996 bh = ext3_bread(handle, inode, blk, 1, &err);
2997 if (!bh)
2998 goto out;
2999 if (journal_quota) {
3000 err = ext3_journal_get_write_access(handle, bh);
3001 if (err) {
3002 brelse(bh);
1da177e4 3003 goto out;
1da177e4 3004 }
1da177e4 3005 }
e5472147
DM		 3006 lock_buffer(bh);
3007 memcpy(bh->b_data+offset, data, len);
3008 flush_dcache_page(bh->b_page);
3009 unlock_buffer(bh);
3010 if (journal_quota)
3011 err = ext3_journal_dirty_metadata(handle, bh);
3012 else {
3013 /* Always do at least ordered writes for quotas */
3014 err = ext3_journal_dirty_data(handle, bh);
3015 mark_buffer_dirty(bh);
3016 }
3017 brelse(bh);
1da177e4 3018out:
e5472147 3019 if (err) {
f5c8f7da 3020 mutex_unlock(&inode->i_mutex);
1da177e4 3021 return err;
f5c8f7da 3022 }
e5472147
DM		 3023 if (inode->i_size < off + len) {
3024 i_size_write(inode, off + len);
1da177e4
LT		 3025 EXT3_I(inode)->i_disksize = inode->i_size;
3026 }
3027 inode->i_version++;
3028 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3029 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 3030 mutex_unlock(&inode->i_mutex);
e5472147 3031 return len;
1da177e4
LT		 3032}
3033
3034#endif
3035
454e2398
DH		 3036static int ext3_get_sb(struct file_system_type *fs_type,
3037 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 3038{
454e2398 3039 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
1da177e4
LT		 3040}
3041
3042static struct file_system_type ext3_fs_type = {
3043 .owner = THIS_MODULE,
3044 .name = "ext3",
3045 .get_sb = ext3_get_sb,
3046 .kill_sb = kill_block_super,
3047 .fs_flags = FS_REQUIRES_DEV,
3048};
3049
3050static int __init init_ext3_fs(void)
3051{
3052 int err = init_ext3_xattr();
3053 if (err)
3054 return err;
3055 err = init_inodecache();
3056 if (err)
3057 goto out1;
3058 err = register_filesystem(&ext3_fs_type);
3059 if (err)
3060 goto out;
3061 return 0;
3062out:
3063 destroy_inodecache();
3064out1:
e9ad5620 3065 exit_ext3_xattr();
1da177e4
LT		 3066 return err;
3067}
3068
3069static void __exit exit_ext3_fs(void)
3070{
3071 unregister_filesystem(&ext3_fs_type);
3072 destroy_inodecache();
3073 exit_ext3_xattr();
3074}
3075
3076MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3077MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3078MODULE_LICENSE("GPL");
3079module_init(init_ext3_fs)
3080module_exit(exit_ext3_fs)
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