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fs: icache RCU free inodes
[deliverable/linux.git] / fs / ext3 / super.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
1da177e4
LT		 19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
1da177e4 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
1da177e4
LT		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
8fc2751b 37#include <linux/seq_file.h>
3fc74269 38#include <linux/log2.h>
381be254 39
1da177e4 40#include <asm/uaccess.h>
381be254 41
1da177e4
LT		 42#include "xattr.h"
43#include "acl.h"
381be254 44#include "namei.h"
1da177e4 45
bbae8bcc
LT		 46#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
47 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
48#else
49 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
50#endif
51
71b96257
JL		 52static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
53 unsigned long journal_devnum);
1da177e4 54static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 55 unsigned int);
c4be0c1d
TS		 56static int ext3_commit_super(struct super_block *sb,
57 struct ext3_super_block *es,
1da177e4
LT		 58 int sync);
59static void ext3_mark_recovery_complete(struct super_block * sb,
60 struct ext3_super_block * es);
61static void ext3_clear_journal_err(struct super_block * sb,
62 struct ext3_super_block * es);
63static int ext3_sync_fs(struct super_block *sb, int wait);
64static const char *ext3_decode_error(struct super_block * sb, int errno,
65 char nbuf[16]);
66static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 67static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 68static int ext3_unfreeze(struct super_block *sb);
c4be0c1d 69static int ext3_freeze(struct super_block *sb);
1da177e4 70
ae6ddcc5 71/*
1da177e4
LT		 72 * Wrappers for journal_start/end.
73 *
74 * The only special thing we need to do here is to make sure that all
75 * journal_end calls result in the superblock being marked dirty, so
76 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 77 * appropriate.
1da177e4
LT		 78 */
79handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
80{
81 journal_t *journal;
82
83 if (sb->s_flags & MS_RDONLY)
84 return ERR_PTR(-EROFS);
85
86 /* Special case here: if the journal has aborted behind our
87 * backs (eg. EIO in the commit thread), then we still need to
88 * take the FS itself readonly cleanly. */
89 journal = EXT3_SB(sb)->s_journal;
90 if (is_journal_aborted(journal)) {
e05b6b52 91 ext3_abort(sb, __func__,
1da177e4
LT		 92 "Detected aborted journal");
93 return ERR_PTR(-EROFS);
94 }
95
96 return journal_start(journal, nblocks);
97}
98
ae6ddcc5 99/*
1da177e4
LT		 100 * The only special thing we need to do here is to make sure that all
101 * journal_stop calls result in the superblock being marked dirty, so
102 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 103 * appropriate.
1da177e4
LT		 104 */
105int __ext3_journal_stop(const char *where, handle_t *handle)
106{
107 struct super_block *sb;
108 int err;
109 int rc;
110
111 sb = handle->h_transaction->t_journal->j_private;
112 err = handle->h_err;
113 rc = journal_stop(handle);
114
115 if (!err)
116 err = rc;
117 if (err)
118 __ext3_std_error(sb, where, err);
119 return err;
120}
121
122void ext3_journal_abort_handle(const char *caller, const char *err_fn,
123 struct buffer_head *bh, handle_t *handle, int err)
124{
125 char nbuf[16];
126 const char *errstr = ext3_decode_error(NULL, err, nbuf);
127
128 if (bh)
129 BUFFER_TRACE(bh, "abort");
130
131 if (!handle->h_err)
132 handle->h_err = err;
133
134 if (is_handle_aborted(handle))
135 return;
136
4cf46b67
AF		 137 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
138 caller, errstr, err_fn);
1da177e4
LT		 139
140 journal_abort_handle(handle);
141}
142
4cf46b67
AF		 143void ext3_msg(struct super_block *sb, const char *prefix,
144 const char *fmt, ...)
145{
146 va_list args;
147
148 va_start(args, fmt);
149 printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
150 vprintk(fmt, args);
151 printk("\n");
152 va_end(args);
153}
154
1da177e4
LT		 155/* Deal with the reporting of failure conditions on a filesystem such as
156 * inconsistencies detected or read IO failures.
157 *
158 * On ext2, we can store the error state of the filesystem in the
159 * superblock. That is not possible on ext3, because we may have other
160 * write ordering constraints on the superblock which prevent us from
161 * writing it out straight away; and given that the journal is about to
162 * be aborted, we can't rely on the current, or future, transactions to
163 * write out the superblock safely.
164 *
165 * We'll just use the journal_abort() error code to record an error in
d6b198bc 166 * the journal instead. On recovery, the journal will complain about
1da177e4
LT		 167 * that error until we've noted it down and cleared it.
168 */
169
170static void ext3_handle_error(struct super_block *sb)
171{
172 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
173
174 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
175 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
176
177 if (sb->s_flags & MS_RDONLY)
178 return;
179
7543fc7b 180 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 181 journal_t *journal = EXT3_SB(sb)->s_journal;
182
e3c96435 183 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
1da177e4
LT		 184 if (journal)
185 journal_abort(journal, -EIO);
186 }
7543fc7b 187 if (test_opt (sb, ERRORS_RO)) {
4cf46b67
AF		 188 ext3_msg(sb, KERN_CRIT,
189 "error: remounting filesystem read-only");
7543fc7b
VA		 190 sb->s_flags |= MS_RDONLY;
191 }
192 ext3_commit_super(sb, es, 1);
1da177e4 193 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 194 panic("EXT3-fs (%s): panic forced after error\n",
1da177e4 195 sb->s_id);
1da177e4
LT		 196}
197
198void ext3_error (struct super_block * sb, const char * function,
199 const char * fmt, ...)
200{
201 va_list args;
202
203 va_start(args, fmt);
204 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
205 vprintk(fmt, args);
206 printk("\n");
207 va_end(args);
208
209 ext3_handle_error(sb);
210}
211
212static const char *ext3_decode_error(struct super_block * sb, int errno,
213 char nbuf[16])
214{
215 char *errstr = NULL;
216
217 switch (errno) {
218 case -EIO:
219 errstr = "IO failure";
220 break;
221 case -ENOMEM:
222 errstr = "Out of memory";
223 break;
224 case -EROFS:
225 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
226 errstr = "Journal has aborted";
227 else
228 errstr = "Readonly filesystem";
229 break;
230 default:
231 /* If the caller passed in an extra buffer for unknown
232 * errors, textualise them now. Else we just return
233 * NULL. */
234 if (nbuf) {
235 /* Check for truncated error codes... */
236 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
237 errstr = nbuf;
238 }
239 break;
240 }
241
242 return errstr;
243}
244
245/* __ext3_std_error decodes expected errors from journaling functions
246 * automatically and invokes the appropriate error response. */
247
248void __ext3_std_error (struct super_block * sb, const char * function,
249 int errno)
250{
251 char nbuf[16];
30121624 252 const char *errstr;
1da177e4 253
30121624
ST		 254 /* Special case: if the error is EROFS, and we're not already
255 * inside a transaction, then there's really no point in logging
256 * an error. */
257 if (errno == -EROFS && journal_current_handle() == NULL &&
258 (sb->s_flags & MS_RDONLY))
259 return;
260
261 errstr = ext3_decode_error(sb, errno, nbuf);
4cf46b67 262 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
1da177e4
LT		 263
264 ext3_handle_error(sb);
265}
266
267/*
268 * ext3_abort is a much stronger failure handler than ext3_error. The
269 * abort function may be used to deal with unrecoverable failures such
270 * as journal IO errors or ENOMEM at a critical moment in log management.
271 *
272 * We unconditionally force the filesystem into an ABORT|READONLY state,
273 * unless the error response on the fs has been set to panic in which
274 * case we take the easy way out and panic immediately.
275 */
276
277void ext3_abort (struct super_block * sb, const char * function,
278 const char * fmt, ...)
279{
280 va_list args;
281
1da177e4 282 va_start(args, fmt);
4cf46b67 283 printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
1da177e4
LT		 284 vprintk(fmt, args);
285 printk("\n");
286 va_end(args);
287
288 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 289 panic("EXT3-fs: panic from previous error\n");
1da177e4
LT		 290
291 if (sb->s_flags & MS_RDONLY)
292 return;
293
4cf46b67
AF		 294 ext3_msg(sb, KERN_CRIT,
295 "error: remounting filesystem read-only");
1da177e4
LT		 296 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
297 sb->s_flags |= MS_RDONLY;
e3c96435 298 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
44d6f787
HK		 299 if (EXT3_SB(sb)->s_journal)
300 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 301}
302
303void ext3_warning (struct super_block * sb, const char * function,
304 const char * fmt, ...)
305{
306 va_list args;
307
308 va_start(args, fmt);
4cf46b67 309 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
1da177e4
LT		 310 sb->s_id, function);
311 vprintk(fmt, args);
312 printk("\n");
313 va_end(args);
314}
315
316void ext3_update_dynamic_rev(struct super_block *sb)
317{
318 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
319
320 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
321 return;
322
4cf46b67
AF		 323 ext3_msg(sb, KERN_WARNING,
324 "warning: updating to rev %d because of "
325 "new feature flag, running e2fsck is recommended",
326 EXT3_DYNAMIC_REV);
1da177e4
LT		 327
328 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
329 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
330 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
331 /* leave es->s_feature_*compat flags alone */
332 /* es->s_uuid will be set by e2fsck if empty */
333
334 /*
335 * The rest of the superblock fields should be zero, and if not it
336 * means they are likely already in use, so leave them alone. We
337 * can leave it up to e2fsck to clean up any inconsistencies there.
338 */
339}
340
341/*
342 * Open the external journal device
343 */
4cf46b67 344static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
1da177e4
LT		 345{
346 struct block_device *bdev;
347 char b[BDEVNAME_SIZE];
348
349 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
350 if (IS_ERR(bdev))
351 goto fail;
352 return bdev;
353
354fail:
4cf46b67
AF		 355 ext3_msg(sb, "error: failed to open journal device %s: %ld",
356 __bdevname(dev, b), PTR_ERR(bdev));
357
1da177e4
LT		 358 return NULL;
359}
360
361/*
362 * Release the journal device
363 */
364static int ext3_blkdev_put(struct block_device *bdev)
365{
366 bd_release(bdev);
9a1c3542 367 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 368}
369
370static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
371{
372 struct block_device *bdev;
373 int ret = -ENODEV;
374
375 bdev = sbi->journal_bdev;
376 if (bdev) {
377 ret = ext3_blkdev_put(bdev);
378 sbi->journal_bdev = NULL;
379 }
380 return ret;
381}
382
383static inline struct inode *orphan_list_entry(struct list_head *l)
384{
385 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
386}
387
388static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
389{
390 struct list_head *l;
391
4cf46b67 392 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
1da177e4
LT		 393 le32_to_cpu(sbi->s_es->s_last_orphan));
394
4cf46b67 395 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
1da177e4
LT		 396 list_for_each(l, &sbi->s_orphan) {
397 struct inode *inode = orphan_list_entry(l);
4cf46b67 398 ext3_msg(sb, KERN_ERR, " "
eee194e7 399 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 400 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 401 inode->i_mode, inode->i_nlink,
1da177e4
LT		 402 NEXT_ORPHAN(inode));
403 }
404}
405
406static void ext3_put_super (struct super_block * sb)
407{
408 struct ext3_sb_info *sbi = EXT3_SB(sb);
409 struct ext3_super_block *es = sbi->s_es;
44d6f787 410 int i, err;
1da177e4 411
e0ccfd95 412 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
1da177e4 413 ext3_xattr_put_super(sb);
44d6f787
HK		 414 err = journal_destroy(sbi->s_journal);
415 sbi->s_journal = NULL;
416 if (err < 0)
2d7c820e 417 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 418
1da177e4
LT		 419 if (!(sb->s_flags & MS_RDONLY)) {
420 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
421 es->s_state = cpu_to_le16(sbi->s_mount_state);
422 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
423 mark_buffer_dirty(sbi->s_sbh);
424 ext3_commit_super(sb, es, 1);
425 }
426
427 for (i = 0; i < sbi->s_gdb_count; i++)
428 brelse(sbi->s_group_desc[i]);
429 kfree(sbi->s_group_desc);
430 percpu_counter_destroy(&sbi->s_freeblocks_counter);
431 percpu_counter_destroy(&sbi->s_freeinodes_counter);
432 percpu_counter_destroy(&sbi->s_dirs_counter);
433 brelse(sbi->s_sbh);
434#ifdef CONFIG_QUOTA
435 for (i = 0; i < MAXQUOTAS; i++)
436 kfree(sbi->s_qf_names[i]);
437#endif
438
439 /* Debugging code just in case the in-memory inode orphan list
440 * isn't empty. The on-disk one can be non-empty if we've
441 * detected an error and taken the fs readonly, but the
442 * in-memory list had better be clean by this point. */
443 if (!list_empty(&sbi->s_orphan))
444 dump_orphan_list(sb, sbi);
445 J_ASSERT(list_empty(&sbi->s_orphan));
446
f98393a6 447 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 448 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
449 /*
450 * Invalidate the journal device's buffers. We don't want them
451 * floating about in memory - the physical journal device may
452 * hotswapped, and it breaks the `ro-after' testing code.
453 */
454 sync_blockdev(sbi->journal_bdev);
f98393a6 455 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 456 ext3_blkdev_remove(sbi);
457 }
458 sb->s_fs_info = NULL;
5df096d6 459 kfree(sbi->s_blockgroup_lock);
1da177e4 460 kfree(sbi);
1da177e4
LT		 461}
462
e18b890b 463static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 464
465/*
466 * Called inside transaction, so use GFP_NOFS
467 */
468static struct inode *ext3_alloc_inode(struct super_block *sb)
469{
470 struct ext3_inode_info *ei;
471
e6b4f8da 472 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 473 if (!ei)
474 return NULL;
1da177e4
LT		 475 ei->i_block_alloc_info = NULL;
476 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 477 atomic_set(&ei->i_datasync_tid, 0);
478 atomic_set(&ei->i_sync_tid, 0);
1da177e4
LT		 479 return &ei->vfs_inode;
480}
481
fa0d7e3d
NP		 482static void ext3_i_callback(struct rcu_head *head)
483{
484 struct inode *inode = container_of(head, struct inode, i_rcu);
485 INIT_LIST_HEAD(&inode->i_dentry);
486 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
487}
488
1da177e4
LT		 489static void ext3_destroy_inode(struct inode *inode)
490{
9f7dd93d
VA		 491 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
492 printk("EXT3 Inode %p: orphan list check failed!\n",
493 EXT3_I(inode));
494 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
495 EXT3_I(inode), sizeof(struct ext3_inode_info),
496 false);
497 dump_stack();
498 }
fa0d7e3d 499 call_rcu(&inode->i_rcu, ext3_i_callback);
1da177e4
LT		 500}
501
51cc5068 502static void init_once(void *foo)
1da177e4
LT		 503{
504 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
505
a35afb83 506 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 507#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 508 init_rwsem(&ei->xattr_sem);
1da177e4 509#endif
a35afb83
CL		 510 mutex_init(&ei->truncate_mutex);
511 inode_init_once(&ei->vfs_inode);
1da177e4 512}
ae6ddcc5 513
1da177e4
LT		 514static int init_inodecache(void)
515{
516 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
517 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 518 0, (SLAB_RECLAIM_ACCOUNT|
519 SLAB_MEM_SPREAD),
20c2df83 520 init_once);
1da177e4
LT		 521 if (ext3_inode_cachep == NULL)
522 return -ENOMEM;
523 return 0;
524}
525
526static void destroy_inodecache(void)
527{
1a1d92c1 528 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 529}
530
6cd37cda 531static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 532{
6cd37cda 533#if defined(CONFIG_QUOTA)
275abf5b 534 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 535
1aeec434
JK		 536 if (sbi->s_jquota_fmt) {
537 char *fmtname = "";
538
539 switch (sbi->s_jquota_fmt) {
540 case QFMT_VFS_OLD:
541 fmtname = "vfsold";
542 break;
543 case QFMT_VFS_V0:
544 fmtname = "vfsv0";
545 break;
546 case QFMT_VFS_V1:
547 fmtname = "vfsv1";
548 break;
549 }
550 seq_printf(seq, ",jqfmt=%s", fmtname);
551 }
8fc2751b
MB		 552
553 if (sbi->s_qf_names[USRQUOTA])
554 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
555
556 if (sbi->s_qf_names[GRPQUOTA])
557 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
558
e3c96435 559 if (test_opt(sb, USRQUOTA))
8fc2751b
MB		 560 seq_puts(seq, ",usrquota");
561
e3c96435 562 if (test_opt(sb, GRPQUOTA))
8fc2751b
MB		 563 seq_puts(seq, ",grpquota");
564#endif
6cd37cda
PO		 565}
566
3c4cec65
JK		 567static char *data_mode_string(unsigned long mode)
568{
569 switch (mode) {
570 case EXT3_MOUNT_JOURNAL_DATA:
571 return "journal";
572 case EXT3_MOUNT_ORDERED_DATA:
573 return "ordered";
574 case EXT3_MOUNT_WRITEBACK_DATA:
575 return "writeback";
576 }
577 return "unknown";
578}
579
571beed8
MS		 580/*
581 * Show an option if
582 * - it's set to a non-default value OR
583 * - if the per-sb default is different from the global default
584 */
6cd37cda
PO		 585static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
586{
587 struct super_block *sb = vfs->mnt_sb;
571beed8
MS		 588 struct ext3_sb_info *sbi = EXT3_SB(sb);
589 struct ext3_super_block *es = sbi->s_es;
590 unsigned long def_mount_opts;
591
592 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
593
594 if (sbi->s_sb_block != 1)
595 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
596 if (test_opt(sb, MINIX_DF))
597 seq_puts(seq, ",minixdf");
598 if (test_opt(sb, GRPID))
599 seq_puts(seq, ",grpid");
600 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
601 seq_puts(seq, ",nogrpid");
602 if (sbi->s_resuid != EXT3_DEF_RESUID ||
603 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
604 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
605 }
606 if (sbi->s_resgid != EXT3_DEF_RESGID ||
607 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
608 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
609 }
1eca93f9 610 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 611 int def_errors = le16_to_cpu(es->s_errors);
612
613 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 614 def_errors == EXT3_ERRORS_CONTINUE) {
615 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 616 }
617 }
1eca93f9
AK		 618 if (test_opt(sb, ERRORS_CONT))
619 seq_puts(seq, ",errors=continue");
571beed8
MS		 620 if (test_opt(sb, ERRORS_PANIC))
621 seq_puts(seq, ",errors=panic");
622 if (test_opt(sb, NO_UID32))
623 seq_puts(seq, ",nouid32");
624 if (test_opt(sb, DEBUG))
625 seq_puts(seq, ",debug");
626 if (test_opt(sb, OLDALLOC))
627 seq_puts(seq, ",oldalloc");
628#ifdef CONFIG_EXT3_FS_XATTR
629 if (test_opt(sb, XATTR_USER))
630 seq_puts(seq, ",user_xattr");
631 if (!test_opt(sb, XATTR_USER) &&
632 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
633 seq_puts(seq, ",nouser_xattr");
634 }
635#endif
636#ifdef CONFIG_EXT3_FS_POSIX_ACL
637 if (test_opt(sb, POSIX_ACL))
638 seq_puts(seq, ",acl");
639 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
640 seq_puts(seq, ",noacl");
641#endif
642 if (!test_opt(sb, RESERVATION))
643 seq_puts(seq, ",noreservation");
644 if (sbi->s_commit_interval) {
645 seq_printf(seq, ",commit=%u",
646 (unsigned) (sbi->s_commit_interval / HZ));
647 }
0636c73e
ES		 648
649 /*
650 * Always display barrier state so it's clear what the status is.
651 */
652 seq_puts(seq, ",barrier=");
653 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
e3c96435 654 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
0e4fb5e2
HK		 655 if (test_opt(sb, DATA_ERR_ABORT))
656 seq_puts(seq, ",data_err=abort");
657
dee1d3b6
ES		 658 if (test_opt(sb, NOLOAD))
659 seq_puts(seq, ",norecovery");
660
6cd37cda 661 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 662
663 return 0;
664}
1da177e4 665
fdb36673 666
74af0baa
CH		 667static struct inode *ext3_nfs_get_inode(struct super_block *sb,
668 u64 ino, u32 generation)
fdb36673 669{
fdb36673 670 struct inode *inode;
fdb36673
N		 671
672 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
673 return ERR_PTR(-ESTALE);
674 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
675 return ERR_PTR(-ESTALE);
676
677 /* iget isn't really right if the inode is currently unallocated!!
678 *
679 * ext3_read_inode will return a bad_inode if the inode had been
680 * deleted, so we should be safe.
681 *
682 * Currently we don't know the generation for parent directory, so
683 * a generation of 0 means "accept any"
684 */
473043dc
DH		 685 inode = ext3_iget(sb, ino);
686 if (IS_ERR(inode))
687 return ERR_CAST(inode);
688 if (generation && inode->i_generation != generation) {
fdb36673
N		 689 iput(inode);
690 return ERR_PTR(-ESTALE);
691 }
74af0baa
CH		 692
693 return inode;
694}
695
696static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
697 int fh_len, int fh_type)
698{
699 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
700 ext3_nfs_get_inode);
701}
702
703static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
704 int fh_len, int fh_type)
705{
706 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
707 ext3_nfs_get_inode);
fdb36673
N		 708}
709
6b082b53
TO		 710/*
711 * Try to release metadata pages (indirect blocks, directories) which are
712 * mapped via the block device. Since these pages could have journal heads
713 * which would prevent try_to_free_buffers() from freeing them, we must use
714 * jbd layer's try_to_free_buffers() function to release them.
715 */
716static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
717 gfp_t wait)
718{
719 journal_t *journal = EXT3_SB(sb)->s_journal;
720
721 WARN_ON(PageChecked(page));
722 if (!page_has_buffers(page))
723 return 0;
724 if (journal)
725 return journal_try_to_free_buffers(journal, page,
726 wait & ~__GFP_WAIT);
727 return try_to_free_buffers(page);
728}
729
8fc2751b 730#ifdef CONFIG_QUOTA
1da177e4
LT		 731#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
732#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
733
1da177e4
LT		 734static int ext3_write_dquot(struct dquot *dquot);
735static int ext3_acquire_dquot(struct dquot *dquot);
736static int ext3_release_dquot(struct dquot *dquot);
737static int ext3_mark_dquot_dirty(struct dquot *dquot);
738static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f 739static int ext3_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 740 char *path);
1da177e4
LT		 741static int ext3_quota_on_mount(struct super_block *sb, int type);
742static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
743 size_t len, loff_t off);
744static ssize_t ext3_quota_write(struct super_block *sb, int type,
745 const char *data, size_t len, loff_t off);
746
61e225dc 747static const struct dquot_operations ext3_quota_operations = {
1da177e4
LT		 748 .write_dquot = ext3_write_dquot,
749 .acquire_dquot = ext3_acquire_dquot,
750 .release_dquot = ext3_release_dquot,
751 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 752 .write_info = ext3_write_info,
753 .alloc_dquot = dquot_alloc,
754 .destroy_dquot = dquot_destroy,
1da177e4
LT		 755};
756
0d54b217 757static const struct quotactl_ops ext3_qctl_operations = {
1da177e4 758 .quota_on = ext3_quota_on,
287a8095
CH		 759 .quota_off = dquot_quota_off,
760 .quota_sync = dquot_quota_sync,
761 .get_info = dquot_get_dqinfo,
762 .set_info = dquot_set_dqinfo,
763 .get_dqblk = dquot_get_dqblk,
764 .set_dqblk = dquot_set_dqblk
1da177e4
LT		 765};
766#endif
767
ee9b6d61 768static const struct super_operations ext3_sops = {
1da177e4
LT		 769 .alloc_inode = ext3_alloc_inode,
770 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 771 .write_inode = ext3_write_inode,
772 .dirty_inode = ext3_dirty_inode,
ac14a95b 773 .evict_inode = ext3_evict_inode,
1da177e4 774 .put_super = ext3_put_super,
1da177e4 775 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 776 .freeze_fs = ext3_freeze,
777 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 778 .statfs = ext3_statfs,
779 .remount_fs = ext3_remount,
8fc2751b 780 .show_options = ext3_show_options,
1da177e4
LT		 781#ifdef CONFIG_QUOTA
782 .quota_read = ext3_quota_read,
783 .quota_write = ext3_quota_write,
784#endif
6b082b53 785 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 786};
787
39655164 788static const struct export_operations ext3_export_ops = {
74af0baa
CH		 789 .fh_to_dentry = ext3_fh_to_dentry,
790 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 791 .get_parent = ext3_get_parent,
792};
793
794enum {
795 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
796 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 797 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 798 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 799 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 800 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 801 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 802 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 803 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1aeec434 804 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
0636c73e
ES		 805 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
806 Opt_resize, Opt_usrquota, Opt_grpquota
1da177e4
LT		 807};
808
a447c093 809static const match_table_t tokens = {
1da177e4
LT		 810 {Opt_bsd_df, "bsddf"},
811 {Opt_minix_df, "minixdf"},
812 {Opt_grpid, "grpid"},
813 {Opt_grpid, "bsdgroups"},
814 {Opt_nogrpid, "nogrpid"},
815 {Opt_nogrpid, "sysvgroups"},
816 {Opt_resgid, "resgid=%u"},
817 {Opt_resuid, "resuid=%u"},
818 {Opt_sb, "sb=%u"},
819 {Opt_err_cont, "errors=continue"},
820 {Opt_err_panic, "errors=panic"},
821 {Opt_err_ro, "errors=remount-ro"},
822 {Opt_nouid32, "nouid32"},
823 {Opt_nocheck, "nocheck"},
824 {Opt_nocheck, "check=none"},
1da177e4
LT		 825 {Opt_debug, "debug"},
826 {Opt_oldalloc, "oldalloc"},
827 {Opt_orlov, "orlov"},
828 {Opt_user_xattr, "user_xattr"},
829 {Opt_nouser_xattr, "nouser_xattr"},
830 {Opt_acl, "acl"},
831 {Opt_noacl, "noacl"},
832 {Opt_reservation, "reservation"},
833 {Opt_noreservation, "noreservation"},
834 {Opt_noload, "noload"},
dee1d3b6 835 {Opt_noload, "norecovery"},
1da177e4 836 {Opt_nobh, "nobh"},
ade1a29e 837 {Opt_bh, "bh"},
1da177e4
LT		 838 {Opt_commit, "commit=%u"},
839 {Opt_journal_update, "journal=update"},
840 {Opt_journal_inum, "journal=%u"},
71b96257 841 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 842 {Opt_abort, "abort"},
843 {Opt_data_journal, "data=journal"},
844 {Opt_data_ordered, "data=ordered"},
845 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 846 {Opt_data_err_abort, "data_err=abort"},
847 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 848 {Opt_offusrjquota, "usrjquota="},
849 {Opt_usrjquota, "usrjquota=%s"},
850 {Opt_offgrpjquota, "grpjquota="},
851 {Opt_grpjquota, "grpjquota=%s"},
852 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
853 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1aeec434 854 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
8fc2751b 855 {Opt_grpquota, "grpquota"},
1f54587b
JK		 856 {Opt_noquota, "noquota"},
857 {Opt_quota, "quota"},
8fc2751b 858 {Opt_usrquota, "usrquota"},
1da177e4 859 {Opt_barrier, "barrier=%u"},
0636c73e
ES		 860 {Opt_barrier, "barrier"},
861 {Opt_nobarrier, "nobarrier"},
1da177e4 862 {Opt_resize, "resize"},
92587216 863 {Opt_err, NULL},
1da177e4
LT		 864};
865
4cf46b67 866static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 867{
e9ad5620
DK		 868 ext3_fsblk_t sb_block;
869 char *options = (char *) *data;
1da177e4
LT		 870
871 if (!options || strncmp(options, "sb=", 3) != 0)
872 return 1; /* Default location */
873 options += 3;
43d23f90 874 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 875 sb_block = simple_strtoul(options, &options, 0);
876 if (*options && *options != ',') {
4cf46b67 877 ext3_msg(sb, "error: invalid sb specification: %s",
1da177e4
LT		 878 (char *) *data);
879 return 1;
880 }
881 if (*options == ',')
882 options++;
883 *data = (void *) options;
884 return sb_block;
885}
886
e1f5c67a
DM		 887#ifdef CONFIG_QUOTA
888static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
889{
890 struct ext3_sb_info *sbi = EXT3_SB(sb);
891 char *qname;
892
893 if (sb_any_quota_loaded(sb) &&
894 !sbi->s_qf_names[qtype]) {
895 ext3_msg(sb, KERN_ERR,
896 "Cannot change journaled "
897 "quota options when quota turned on");
898 return 0;
899 }
900 qname = match_strdup(args);
901 if (!qname) {
902 ext3_msg(sb, KERN_ERR,
903 "Not enough memory for storing quotafile name");
904 return 0;
905 }
906 if (sbi->s_qf_names[qtype] &&
907 strcmp(sbi->s_qf_names[qtype], qname)) {
908 ext3_msg(sb, KERN_ERR,
909 "%s quota file already specified", QTYPE2NAME(qtype));
910 kfree(qname);
911 return 0;
912 }
913 sbi->s_qf_names[qtype] = qname;
914 if (strchr(sbi->s_qf_names[qtype], '/')) {
915 ext3_msg(sb, KERN_ERR,
916 "quotafile must be on filesystem root");
917 kfree(sbi->s_qf_names[qtype]);
918 sbi->s_qf_names[qtype] = NULL;
919 return 0;
920 }
921 set_opt(sbi->s_mount_opt, QUOTA);
922 return 1;
923}
924
925static int clear_qf_name(struct super_block *sb, int qtype) {
926
927 struct ext3_sb_info *sbi = EXT3_SB(sb);
928
929 if (sb_any_quota_loaded(sb) &&
930 sbi->s_qf_names[qtype]) {
931 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
932 " when quota turned on");
933 return 0;
934 }
935 /*
936 * The space will be released later when all options are confirmed
937 * to be correct
938 */
939 sbi->s_qf_names[qtype] = NULL;
940 return 1;
941}
942#endif
943
71b96257 944static int parse_options (char *options, struct super_block *sb,
eee194e7 945 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 946 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 947{
948 struct ext3_sb_info *sbi = EXT3_SB(sb);
949 char * p;
950 substring_t args[MAX_OPT_ARGS];
951 int data_opt = 0;
952 int option;
953#ifdef CONFIG_QUOTA
e1f5c67a 954 int qfmt;
1da177e4
LT		 955#endif
956
957 if (!options)
958 return 1;
959
960 while ((p = strsep (&options, ",")) != NULL) {
961 int token;
962 if (!*p)
963 continue;
0636c73e
ES		 964 /*
965 * Initialize args struct so we know whether arg was
966 * found; some options take optional arguments.
967 */
968 args[0].to = args[0].from = 0;
1da177e4
LT		 969 token = match_token(p, tokens, args);
970 switch (token) {
971 case Opt_bsd_df:
972 clear_opt (sbi->s_mount_opt, MINIX_DF);
973 break;
974 case Opt_minix_df:
975 set_opt (sbi->s_mount_opt, MINIX_DF);
976 break;
977 case Opt_grpid:
978 set_opt (sbi->s_mount_opt, GRPID);
979 break;
980 case Opt_nogrpid:
981 clear_opt (sbi->s_mount_opt, GRPID);
982 break;
983 case Opt_resuid:
984 if (match_int(&args[0], &option))
985 return 0;
986 sbi->s_resuid = option;
987 break;
988 case Opt_resgid:
989 if (match_int(&args[0], &option))
990 return 0;
991 sbi->s_resgid = option;
992 break;
993 case Opt_sb:
994 /* handled by get_sb_block() instead of here */
995 /* *sb_block = match_int(&args[0]); */
996 break;
997 case Opt_err_panic:
998 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
999 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1000 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1001 break;
1002 case Opt_err_ro:
1003 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1004 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1005 set_opt (sbi->s_mount_opt, ERRORS_RO);
1006 break;
1007 case Opt_err_cont:
1008 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1009 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1010 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1011 break;
1012 case Opt_nouid32:
1013 set_opt (sbi->s_mount_opt, NO_UID32);
1014 break;
1da177e4
LT		 1015 case Opt_nocheck:
1016 clear_opt (sbi->s_mount_opt, CHECK);
1017 break;
1018 case Opt_debug:
1019 set_opt (sbi->s_mount_opt, DEBUG);
1020 break;
1021 case Opt_oldalloc:
1022 set_opt (sbi->s_mount_opt, OLDALLOC);
1023 break;
1024 case Opt_orlov:
1025 clear_opt (sbi->s_mount_opt, OLDALLOC);
1026 break;
1027#ifdef CONFIG_EXT3_FS_XATTR
1028 case Opt_user_xattr:
1029 set_opt (sbi->s_mount_opt, XATTR_USER);
1030 break;
1031 case Opt_nouser_xattr:
1032 clear_opt (sbi->s_mount_opt, XATTR_USER);
1033 break;
1034#else
1035 case Opt_user_xattr:
1036 case Opt_nouser_xattr:
4cf46b67
AF		 1037 ext3_msg(sb, KERN_INFO,
1038 "(no)user_xattr options not supported");
1da177e4
LT		 1039 break;
1040#endif
1041#ifdef CONFIG_EXT3_FS_POSIX_ACL
1042 case Opt_acl:
1043 set_opt(sbi->s_mount_opt, POSIX_ACL);
1044 break;
1045 case Opt_noacl:
1046 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1047 break;
1048#else
1049 case Opt_acl:
1050 case Opt_noacl:
4cf46b67
AF		 1051 ext3_msg(sb, KERN_INFO,
1052 "(no)acl options not supported");
1da177e4
LT		 1053 break;
1054#endif
1055 case Opt_reservation:
1056 set_opt(sbi->s_mount_opt, RESERVATION);
1057 break;
1058 case Opt_noreservation:
1059 clear_opt(sbi->s_mount_opt, RESERVATION);
1060 break;
1061 case Opt_journal_update:
1062 /* @@@ FIXME */
1063 /* Eventually we will want to be able to create
1064 a journal file here. For now, only allow the
1065 user to specify an existing inode to be the
1066 journal file. */
1067 if (is_remount) {
4cf46b67
AF		 1068 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1069 "journal on remount");
1da177e4
LT		 1070 return 0;
1071 }
1072 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1073 break;
1074 case Opt_journal_inum:
1075 if (is_remount) {
4cf46b67
AF		 1076 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1077 "journal on remount");
1da177e4
LT		 1078 return 0;
1079 }
1080 if (match_int(&args[0], &option))
1081 return 0;
1082 *inum = option;
1083 break;
71b96257
JL		 1084 case Opt_journal_dev:
1085 if (is_remount) {
4cf46b67
AF		 1086 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1087 "journal on remount");
71b96257
JL		 1088 return 0;
1089 }
1090 if (match_int(&args[0], &option))
1091 return 0;
1092 *journal_devnum = option;
1093 break;
1da177e4
LT		 1094 case Opt_noload:
1095 set_opt (sbi->s_mount_opt, NOLOAD);
1096 break;
1097 case Opt_commit:
1098 if (match_int(&args[0], &option))
1099 return 0;
1100 if (option < 0)
1101 return 0;
1102 if (option == 0)
1103 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1104 sbi->s_commit_interval = HZ * option;
1105 break;
1106 case Opt_data_journal:
1107 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1108 goto datacheck;
1109 case Opt_data_ordered:
1110 data_opt = EXT3_MOUNT_ORDERED_DATA;
1111 goto datacheck;
1112 case Opt_data_writeback:
1113 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1114 datacheck:
1115 if (is_remount) {
e3c96435 1116 if (test_opt(sb, DATA_FLAGS) == data_opt)
3c4cec65 1117 break;
4cf46b67
AF		 1118 ext3_msg(sb, KERN_ERR,
1119 "error: cannot change "
3c4cec65
JK		 1120 "data mode on remount. The filesystem "
1121 "is mounted in data=%s mode and you "
4cf46b67 1122 "try to remount it in data=%s mode.",
e3c96435
DM		 1123 data_mode_string(test_opt(sb,
1124 DATA_FLAGS)),
3c4cec65
JK		 1125 data_mode_string(data_opt));
1126 return 0;
1da177e4 1127 } else {
e3c96435 1128 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1da177e4
LT		 1129 sbi->s_mount_opt |= data_opt;
1130 }
1131 break;
0e4fb5e2
HK		 1132 case Opt_data_err_abort:
1133 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1134 break;
1135 case Opt_data_err_ignore:
1136 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1137 break;
1da177e4
LT		 1138#ifdef CONFIG_QUOTA
1139 case Opt_usrjquota:
e1f5c67a 1140 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1da177e4 1141 return 0;
e1f5c67a
DM		 1142 break;
1143 case Opt_grpjquota:
1144 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1da177e4 1145 return 0;
1da177e4
LT		 1146 break;
1147 case Opt_offusrjquota:
e1f5c67a
DM		 1148 if (!clear_qf_name(sb, USRQUOTA))
1149 return 0;
1150 break;
1da177e4 1151 case Opt_offgrpjquota:
e1f5c67a 1152 if (!clear_qf_name(sb, GRPQUOTA))
1da177e4 1153 return 0;
1da177e4
LT		 1154 break;
1155 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1156 qfmt = QFMT_VFS_OLD;
1157 goto set_qf_format;
1da177e4 1158 case Opt_jqfmt_vfsv0:
d06bf1d2 1159 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1160 goto set_qf_format;
1161 case Opt_jqfmt_vfsv1:
1162 qfmt = QFMT_VFS_V1;
d06bf1d2 1163set_qf_format:
ee0d5ffe 1164 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1165 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1166 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1167 "journaled quota options when "
4cf46b67 1168 "quota turned on.");
d06bf1d2
JK		 1169 return 0;
1170 }
1171 sbi->s_jquota_fmt = qfmt;
1da177e4 1172 break;
1f54587b 1173 case Opt_quota:
8fc2751b
MB		 1174 case Opt_usrquota:
1175 set_opt(sbi->s_mount_opt, QUOTA);
1176 set_opt(sbi->s_mount_opt, USRQUOTA);
1177 break;
1178 case Opt_grpquota:
1f54587b 1179 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1180 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1181 break;
1182 case Opt_noquota:
ee0d5ffe 1183 if (sb_any_quota_loaded(sb)) {
4cf46b67
AF		 1184 ext3_msg(sb, KERN_ERR, "error: cannot change "
1185 "quota options when quota turned on.");
1f54587b
JK		 1186 return 0;
1187 }
1188 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1189 clear_opt(sbi->s_mount_opt, USRQUOTA);
1190 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1191 break;
1da177e4 1192#else
8fc2751b
MB		 1193 case Opt_quota:
1194 case Opt_usrquota:
1195 case Opt_grpquota:
4cf46b67
AF		 1196 ext3_msg(sb, KERN_ERR,
1197 "error: quota options not supported.");
fa1ff1e0 1198 break;
1da177e4
LT		 1199 case Opt_usrjquota:
1200 case Opt_grpjquota:
1201 case Opt_offusrjquota:
1202 case Opt_offgrpjquota:
1203 case Opt_jqfmt_vfsold:
1204 case Opt_jqfmt_vfsv0:
1aeec434 1205 case Opt_jqfmt_vfsv1:
4cf46b67
AF		 1206 ext3_msg(sb, KERN_ERR,
1207 "error: journaled quota options not "
1208 "supported.");
1da177e4 1209 break;
1f54587b
JK		 1210 case Opt_noquota:
1211 break;
1da177e4
LT		 1212#endif
1213 case Opt_abort:
1214 set_opt(sbi->s_mount_opt, ABORT);
1215 break;
0636c73e
ES		 1216 case Opt_nobarrier:
1217 clear_opt(sbi->s_mount_opt, BARRIER);
1218 break;
1da177e4 1219 case Opt_barrier:
0636c73e
ES		 1220 if (args[0].from) {
1221 if (match_int(&args[0], &option))
1222 return 0;
1223 } else
1224 option = 1; /* No argument, default to 1 */
1da177e4
LT		 1225 if (option)
1226 set_opt(sbi->s_mount_opt, BARRIER);
1227 else
1228 clear_opt(sbi->s_mount_opt, BARRIER);
1229 break;
1230 case Opt_ignore:
1231 break;
1232 case Opt_resize:
08c6a96f 1233 if (!is_remount) {
4cf46b67
AF		 1234 ext3_msg(sb, KERN_ERR,
1235 "error: resize option only available "
1236 "for remount");
1da177e4
LT		 1237 return 0;
1238 }
c7f1721e
KZ		 1239 if (match_int(&args[0], &option) != 0)
1240 return 0;
1da177e4
LT		 1241 *n_blocks_count = option;
1242 break;
1243 case Opt_nobh:
4c4d3901
CH		 1244 ext3_msg(sb, KERN_WARNING,
1245 "warning: ignoring deprecated nobh option");
1da177e4 1246 break;
ade1a29e 1247 case Opt_bh:
4c4d3901
CH		 1248 ext3_msg(sb, KERN_WARNING,
1249 "warning: ignoring deprecated bh option");
ade1a29e 1250 break;
1da177e4 1251 default:
4cf46b67
AF		 1252 ext3_msg(sb, KERN_ERR,
1253 "error: unrecognized mount option \"%s\" "
1254 "or missing value", p);
1da177e4
LT		 1255 return 0;
1256 }
1257 }
1258#ifdef CONFIG_QUOTA
8fc2751b 1259 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
e3c96435 1260 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
8fc2751b 1261 clear_opt(sbi->s_mount_opt, USRQUOTA);
e3c96435 1262 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
8fc2751b
MB		 1263 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1264
e1f5c67a 1265 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
4cf46b67
AF		 1266 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1267 "format mixing.");
8fc2751b
MB		 1268 return 0;
1269 }
1270
1271 if (!sbi->s_jquota_fmt) {
4cf46b67
AF		 1272 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1273 "not specified.");
8fc2751b
MB		 1274 return 0;
1275 }
1276 } else {
1277 if (sbi->s_jquota_fmt) {
4cf46b67 1278 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
99aeaf63 1279 "specified with no journaling "
4cf46b67 1280 "enabled.");
8fc2751b
MB		 1281 return 0;
1282 }
1da177e4
LT		 1283 }
1284#endif
1da177e4
LT		 1285 return 1;
1286}
1287
1288static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1289 int read_only)
1290{
1291 struct ext3_sb_info *sbi = EXT3_SB(sb);
1292 int res = 0;
1293
1294 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
AF		 1295 ext3_msg(sb, KERN_ERR,
1296 "error: revision level too high, "
1297 "forcing read-only mode");
1da177e4
LT		 1298 res = MS_RDONLY;
1299 }
1300 if (read_only)
1301 return res;
1302 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
AF		 1303 ext3_msg(sb, KERN_WARNING,
1304 "warning: mounting unchecked fs, "
1305 "running e2fsck is recommended");
1da177e4 1306 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
AF		 1307 ext3_msg(sb, KERN_WARNING,
1308 "warning: mounting fs with errors, "
1309 "running e2fsck is recommended");
df0d6b8f 1310 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1da177e4 1311 le16_to_cpu(es->s_mnt_count) >=
df0d6b8f 1312 le16_to_cpu(es->s_max_mnt_count))
4cf46b67
AF		 1313 ext3_msg(sb, KERN_WARNING,
1314 "warning: maximal mount count reached, "
1315 "running e2fsck is recommended");
1da177e4
LT		 1316 else if (le32_to_cpu(es->s_checkinterval) &&
1317 (le32_to_cpu(es->s_lastcheck) +
1318 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
AF		 1319 ext3_msg(sb, KERN_WARNING,
1320 "warning: checktime reached, "
1321 "running e2fsck is recommended");
1da177e4
LT		 1322#if 0
1323 /* @@@ We _will_ want to clear the valid bit if we find
1324 inconsistencies, to force a fsck at reboot. But for
1325 a plain journaled filesystem we can keep it set as
1326 valid forever! :) */
e7f23ebd 1327 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4 1328#endif
df0d6b8f 1329 if (!le16_to_cpu(es->s_max_mnt_count))
1da177e4 1330 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1331 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1332 es->s_mtime = cpu_to_le32(get_seconds());
1333 ext3_update_dynamic_rev(sb);
1334 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1335
1336 ext3_commit_super(sb, es, 1);
1337 if (test_opt(sb, DEBUG))
4cf46b67
AF		 1338 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1339 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1340 sb->s_blocksize,
1341 sbi->s_groups_count,
1342 EXT3_BLOCKS_PER_GROUP(sb),
1343 EXT3_INODES_PER_GROUP(sb),
1344 sbi->s_mount_opt);
1345
1da177e4
LT		 1346 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1347 char b[BDEVNAME_SIZE];
4cf46b67 1348 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1349 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1350 } else {
4cf46b67 1351 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1352 }
1da177e4
LT		 1353 return res;
1354}
1355
1356/* Called at mount-time, super-block is locked */
197cd65a 1357static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1358{
1359 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1360 int i;
1361
1362 ext3_debug ("Checking group descriptors");
1363
197cd65a
AM		 1364 for (i = 0; i < sbi->s_groups_count; i++) {
1365 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1366 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1367 ext3_fsblk_t last_block;
197cd65a 1368
855565e8
ES		 1369 if (i == sbi->s_groups_count - 1)
1370 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1371 else
1372 last_block = first_block +
1373 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1374
855565e8
ES		 1375 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1376 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1377 {
1378 ext3_error (sb, "ext3_check_descriptors",
1379 "Block bitmap for group %d"
1380 " not in group (block %lu)!",
1381 i, (unsigned long)
1382 le32_to_cpu(gdp->bg_block_bitmap));
1383 return 0;
1384 }
855565e8
ES		 1385 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1386 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1387 {
1388 ext3_error (sb, "ext3_check_descriptors",
1389 "Inode bitmap for group %d"
1390 " not in group (block %lu)!",
1391 i, (unsigned long)
1392 le32_to_cpu(gdp->bg_inode_bitmap));
1393 return 0;
1394 }
855565e8 1395 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1396 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1397 last_block)
1da177e4
LT		 1398 {
1399 ext3_error (sb, "ext3_check_descriptors",
1400 "Inode table for group %d"
1401 " not in group (block %lu)!",
1402 i, (unsigned long)
1403 le32_to_cpu(gdp->bg_inode_table));
1404 return 0;
1405 }
1da177e4
LT		 1406 }
1407
1408 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1409 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1410 return 1;
1411}
1412
1413
1414/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1415 * the superblock) which were deleted from all directories, but held open by
1416 * a process at the time of a crash. We walk the list and try to delete these
1417 * inodes at recovery time (only with a read-write filesystem).
1418 *
1419 * In order to keep the orphan inode chain consistent during traversal (in
1420 * case of crash during recovery), we link each inode into the superblock
1421 * orphan list_head and handle it the same way as an inode deletion during
1422 * normal operation (which journals the operations for us).
1423 *
1424 * We only do an iget() and an iput() on each inode, which is very safe if we
1425 * accidentally point at an in-use or already deleted inode. The worst that
1426 * can happen in this case is that we get a "bit already cleared" message from
1427 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1428 * e2fsck was run on this filesystem, and it must have already done the orphan
1429 * inode cleanup for us, so we can safely abort without any further action.
1430 */
1431static void ext3_orphan_cleanup (struct super_block * sb,
1432 struct ext3_super_block * es)
1433{
1434 unsigned int s_flags = sb->s_flags;
1435 int nr_orphans = 0, nr_truncates = 0;
1436#ifdef CONFIG_QUOTA
1437 int i;
1438#endif
1439 if (!es->s_last_orphan) {
1440 jbd_debug(4, "no orphan inodes to clean up\n");
1441 return;
1442 }
1443
a8f48a95 1444 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
AF		 1445 ext3_msg(sb, KERN_ERR, "error: write access "
1446 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1447 return;
1448 }
1449
1da177e4
LT		 1450 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1451 if (es->s_last_orphan)
1452 jbd_debug(1, "Errors on filesystem, "
1453 "clearing orphan list.\n");
1454 es->s_last_orphan = 0;
1455 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1456 return;
1457 }
1458
1459 if (s_flags & MS_RDONLY) {
4cf46b67 1460 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1461 sb->s_flags &= ~MS_RDONLY;
1462 }
1463#ifdef CONFIG_QUOTA
1464 /* Needed for iput() to work correctly and not trash data */
1465 sb->s_flags |= MS_ACTIVE;
1466 /* Turn on quotas so that they are updated correctly */
1467 for (i = 0; i < MAXQUOTAS; i++) {
1468 if (EXT3_SB(sb)->s_qf_names[i]) {
1469 int ret = ext3_quota_on_mount(sb, i);
1470 if (ret < 0)
4cf46b67
AF		 1471 ext3_msg(sb, KERN_ERR,
1472 "error: cannot turn on journaled "
1473 "quota: %d", ret);
1da177e4
LT		 1474 }
1475 }
1476#endif
1477
1478 while (es->s_last_orphan) {
1479 struct inode *inode;
1480
473043dc
DH		 1481 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1482 if (IS_ERR(inode)) {
1da177e4
LT		 1483 es->s_last_orphan = 0;
1484 break;
1485 }
1486
1487 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
871a2931 1488 dquot_initialize(inode);
1da177e4
LT		 1489 if (inode->i_nlink) {
1490 printk(KERN_DEBUG
eee194e7 1491 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1492 __func__, inode->i_ino, inode->i_size);
eee194e7 1493 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1494 inode->i_ino, inode->i_size);
1495 ext3_truncate(inode);
1496 nr_truncates++;
1497 } else {
1498 printk(KERN_DEBUG
eee194e7 1499 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1500 __func__, inode->i_ino);
eee194e7 1501 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1502 inode->i_ino);
1503 nr_orphans++;
1504 }
1505 iput(inode); /* The delete magic happens here! */
1506 }
1507
1508#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1509
1510 if (nr_orphans)
4cf46b67
AF		 1511 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1512 PLURAL(nr_orphans));
1da177e4 1513 if (nr_truncates)
4cf46b67
AF		 1514 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1515 PLURAL(nr_truncates));
1da177e4
LT		 1516#ifdef CONFIG_QUOTA
1517 /* Turn quotas off */
1518 for (i = 0; i < MAXQUOTAS; i++) {
1519 if (sb_dqopt(sb)->files[i])
287a8095 1520 dquot_quota_off(sb, i);
1da177e4
LT		 1521 }
1522#endif
1523 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1524}
1525
1da177e4
LT		 1526/*
1527 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1528 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1529 * We need to be 1 filesystem block less than the 2^32 sector limit.
1530 */
1531static loff_t ext3_max_size(int bits)
1532{
1533 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1534 int meta_blocks;
1535 loff_t upper_limit;
1536
1537 /* This is calculated to be the largest file size for a
1538 * dense, file such that the total number of
1da177e4 1539 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1540 * does not exceed 2^32 -1
1541 * __u32 i_blocks representing the total number of
1542 * 512 bytes blocks of the file
1543 */
1544 upper_limit = (1LL << 32) - 1;
1545
1546 /* total blocks in file system block size */
1547 upper_limit >>= (bits - 9);
1548
1549
1550 /* indirect blocks */
1551 meta_blocks = 1;
1552 /* double indirect blocks */
1553 meta_blocks += 1 + (1LL << (bits-2));
1554 /* tripple indirect blocks */
1555 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1556
1557 upper_limit -= meta_blocks;
1558 upper_limit <<= bits;
1da177e4
LT		 1559
1560 res += 1LL << (bits-2);
1561 res += 1LL << (2*(bits-2));
1562 res += 1LL << (3*(bits-2));
1563 res <<= bits;
1564 if (res > upper_limit)
1565 res = upper_limit;
fe7fdc37
AK		 1566
1567 if (res > MAX_LFS_FILESIZE)
1568 res = MAX_LFS_FILESIZE;
1569
1da177e4
LT		 1570 return res;
1571}
1572
43d23f90
MC		 1573static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1574 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1575 int nr)
1576{
1577 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1578 unsigned long bg, first_meta_bg;
1da177e4
LT		 1579 int has_super = 0;
1580
1da177e4
LT		 1581 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1582
1583 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1584 nr < first_meta_bg)
1585 return (logic_sb_block + nr + 1);
1586 bg = sbi->s_desc_per_block * nr;
1587 if (ext3_bg_has_super(sb, bg))
1588 has_super = 1;
43d23f90 1589 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1590}
1591
1592
1593static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1594{
1595 struct buffer_head * bh;
1596 struct ext3_super_block *es = NULL;
1597 struct ext3_sb_info *sbi;
43d23f90 1598 ext3_fsblk_t block;
4cf46b67 1599 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1600 ext3_fsblk_t logic_sb_block;
1da177e4 1601 unsigned long offset = 0;
eee194e7 1602 unsigned int journal_inum = 0;
71b96257 1603 unsigned long journal_devnum = 0;
1da177e4
LT		 1604 unsigned long def_mount_opts;
1605 struct inode *root;
1606 int blocksize;
1607 int hblock;
1608 int db_count;
1609 int i;
1610 int needs_recovery;
473043dc 1611 int ret = -EINVAL;
1da177e4 1612 __le32 features;
833f4077 1613 int err;
1da177e4 1614
f8314dc6 1615 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1616 if (!sbi)
1617 return -ENOMEM;
5df096d6
PE		 1618
1619 sbi->s_blockgroup_lock =
1620 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1621 if (!sbi->s_blockgroup_lock) {
1622 kfree(sbi);
1623 return -ENOMEM;
1624 }
1da177e4 1625 sb->s_fs_info = sbi;
1da177e4
LT		 1626 sbi->s_mount_opt = 0;
1627 sbi->s_resuid = EXT3_DEF_RESUID;
1628 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1629 sbi->s_sb_block = sb_block;
1da177e4 1630
1da177e4
LT		 1631 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1632 if (!blocksize) {
4cf46b67 1633 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1634 goto out_fail;
1635 }
1636
1637 /*
1638 * The ext3 superblock will not be buffer aligned for other than 1kB
1639 * block sizes. We need to calculate the offset from buffer start.
1640 */
1641 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1642 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1643 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1644 } else {
1645 logic_sb_block = sb_block;
1646 }
1647
1648 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1649 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1650 goto out_fail;
1651 }
1652 /*
1653 * Note: s_es must be initialized as soon as possible because
1654 * some ext3 macro-instructions depend on its value
1655 */
57e94d86 1656 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 1657 sbi->s_es = es;
1658 sb->s_magic = le16_to_cpu(es->s_magic);
1659 if (sb->s_magic != EXT3_SUPER_MAGIC)
1660 goto cantfind_ext3;
1661
1662 /* Set defaults before we parse the mount options */
1663 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1664 if (def_mount_opts & EXT3_DEFM_DEBUG)
1665 set_opt(sbi->s_mount_opt, DEBUG);
1666 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1667 set_opt(sbi->s_mount_opt, GRPID);
1668 if (def_mount_opts & EXT3_DEFM_UID16)
1669 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1670#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1671 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1672 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1673#endif
1674#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1675 if (def_mount_opts & EXT3_DEFM_ACL)
1676 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1677#endif
1da177e4 1678 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
e3c96435 1679 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1da177e4 1680 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
e3c96435 1681 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1da177e4 1682 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
e3c96435 1683 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1da177e4
LT		 1684
1685 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1686 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1687 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1688 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1689 else
1690 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1691
1692 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1693 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1694
1695 set_opt(sbi->s_mount_opt, RESERVATION);
1696
71b96257
JL		 1697 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1698 NULL, 0))
1da177e4
LT		 1699 goto failed_mount;
1700
1701 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 1702 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 1703
1704 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1705 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1706 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1707 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
AF		 1708 ext3_msg(sb, KERN_WARNING,
1709 "warning: feature flags set on rev 0 fs, "
1710 "running e2fsck is recommended");
1da177e4
LT		 1711 /*
1712 * Check feature flags regardless of the revision level, since we
1713 * previously didn't change the revision level when setting the flags,
1714 * so there is a chance incompat flags are set on a rev 0 filesystem.
1715 */
1716 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1717 if (features) {
4cf46b67
AF		 1718 ext3_msg(sb, KERN_ERR,
1719 "error: couldn't mount because of unsupported "
1720 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1721 goto failed_mount;
1722 }
1723 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1724 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
AF		 1725 ext3_msg(sb, KERN_ERR,
1726 "error: couldn't mount RDWR because of unsupported "
1727 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1728 goto failed_mount;
1729 }
1730 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1731
1732 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1733 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
AF		 1734 ext3_msg(sb, KERN_ERR,
1735 "error: couldn't mount because of unsupported "
1736 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1737 goto failed_mount;
1738 }
1739
e1defc4f 1740 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1741 if (sb->s_blocksize != blocksize) {
1742 /*
1743 * Make sure the blocksize for the filesystem is larger
1744 * than the hardware sectorsize for the machine.
1745 */
1746 if (blocksize < hblock) {
4cf46b67
AF		 1747 ext3_msg(sb, KERN_ERR,
1748 "error: fsblocksize %d too small for "
1749 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1750 goto failed_mount;
1751 }
1752
1753 brelse (bh);
0f0a89eb 1754 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
AF		 1755 ext3_msg(sb, KERN_ERR,
1756 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1757 goto out_fail;
1758 }
1da177e4
LT		 1759 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1760 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1761 bh = sb_bread(sb, logic_sb_block);
1762 if (!bh) {
4cf46b67
AF		 1763 ext3_msg(sb, KERN_ERR,
1764 "error: can't read superblock on 2nd try");
1da177e4
LT		 1765 goto failed_mount;
1766 }
57e94d86 1767 es = (struct ext3_super_block *)(bh->b_data + offset);
1da177e4
LT		 1768 sbi->s_es = es;
1769 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
AF		 1770 ext3_msg(sb, KERN_ERR,
1771 "error: magic mismatch");
1da177e4
LT		 1772 goto failed_mount;
1773 }
1774 }
1775
1776 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1777
1778 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1779 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1780 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1781 } else {
1782 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1783 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1784 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1785 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1786 (sbi->s_inode_size > blocksize)) {
4cf46b67
AF		 1787 ext3_msg(sb, KERN_ERR,
1788 "error: unsupported inode size: %d",
1da177e4
LT		 1789 sbi->s_inode_size);
1790 goto failed_mount;
1791 }
1792 }
1793 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1794 le32_to_cpu(es->s_log_frag_size);
1795 if (blocksize != sbi->s_frag_size) {
4cf46b67
AF		 1796 ext3_msg(sb, KERN_ERR,
1797 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1798 sbi->s_frag_size, blocksize);
1799 goto failed_mount;
1800 }
1801 sbi->s_frags_per_block = 1;
1802 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1803 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1804 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1805 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1806 goto cantfind_ext3;
1807 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1808 if (sbi->s_inodes_per_block == 0)
1809 goto cantfind_ext3;
1810 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1811 sbi->s_inodes_per_block;
1812 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1813 sbi->s_sbh = bh;
1814 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1815 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1816 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1817 for (i=0; i < 4; i++)
1818 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1819 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1820 i = le32_to_cpu(es->s_flags);
1821 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1822 sbi->s_hash_unsigned = 3;
1823 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1824#ifdef __CHAR_UNSIGNED__
1825 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1826 sbi->s_hash_unsigned = 3;
1827#else
1828 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1829#endif
5e1f8c9e 1830 }
1da177e4
LT		 1831
1832 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
AF		 1833 ext3_msg(sb, KERN_ERR,
1834 "#blocks per group too big: %lu",
1da177e4
LT		 1835 sbi->s_blocks_per_group);
1836 goto failed_mount;
1837 }
1838 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
AF		 1839 ext3_msg(sb, KERN_ERR,
1840 "error: #fragments per group too big: %lu",
1da177e4
LT		 1841 sbi->s_frags_per_group);
1842 goto failed_mount;
1843 }
1844 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
AF		 1845 ext3_msg(sb, KERN_ERR,
1846 "error: #inodes per group too big: %lu",
1da177e4
LT		 1847 sbi->s_inodes_per_group);
1848 goto failed_mount;
1849 }
1850
30ca22c7
PL		 1851 if (generic_check_addressable(sb->s_blocksize_bits,
1852 le32_to_cpu(es->s_blocks_count))) {
4cf46b67
AF		 1853 ext3_msg(sb, KERN_ERR,
1854 "error: filesystem is too large to mount safely");
fcd5df35 1855 if (sizeof(sector_t) < 8)
4cf46b67
AF		 1856 ext3_msg(sb, KERN_ERR,
1857 "error: CONFIG_LBDAF not enabled");
fcd5df35
MC		 1858 goto failed_mount;
1859 }
1860
1da177e4
LT		 1861 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1862 goto cantfind_ext3;
855565e8
ES		 1863 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1864 le32_to_cpu(es->s_first_data_block) - 1)
1865 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
81a4e320 1866 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1867 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1868 GFP_KERNEL);
1869 if (sbi->s_group_desc == NULL) {
4cf46b67
AF		 1870 ext3_msg(sb, KERN_ERR,
1871 "error: not enough memory");
4569cd1b 1872 ret = -ENOMEM;
1da177e4
LT		 1873 goto failed_mount;
1874 }
1875
5df096d6 1876 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1877
1878 for (i = 0; i < db_count; i++) {
1879 block = descriptor_loc(sb, logic_sb_block, i);
1880 sbi->s_group_desc[i] = sb_bread(sb, block);
1881 if (!sbi->s_group_desc[i]) {
4cf46b67
AF		 1882 ext3_msg(sb, KERN_ERR,
1883 "error: can't read group descriptor %d", i);
1da177e4
LT		 1884 db_count = i;
1885 goto failed_mount2;
1886 }
1887 }
1888 if (!ext3_check_descriptors (sb)) {
4cf46b67
AF		 1889 ext3_msg(sb, KERN_ERR,
1890 "error: group descriptors corrupted");
1da177e4
LT		 1891 goto failed_mount2;
1892 }
1893 sbi->s_gdb_count = db_count;
1894 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1895 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1896
1da177e4
LT		 1897 /* per fileystem reservation list head & lock */
1898 spin_lock_init(&sbi->s_rsv_window_lock);
1899 sbi->s_rsv_window_root = RB_ROOT;
1900 /* Add a single, static dummy reservation to the start of the
1901 * reservation window list --- it gives us a placeholder for
1902 * append-at-start-of-list which makes the allocation logic
1903 * _much_ simpler. */
1904 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1905 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1906 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1907 sbi->s_rsv_window_head.rsv_goal_size = 0;
1908 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1909
1910 /*
1911 * set up enough so that it can read an inode
1912 */
1913 sb->s_op = &ext3_sops;
1914 sb->s_export_op = &ext3_export_ops;
1915 sb->s_xattr = ext3_xattr_handlers;
1916#ifdef CONFIG_QUOTA
1917 sb->s_qcop = &ext3_qctl_operations;
1918 sb->dq_op = &ext3_quota_operations;
1919#endif
1920 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 1921 mutex_init(&sbi->s_orphan_lock);
96d2a495 1922 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 1923
1924 sb->s_root = NULL;
1925
1926 needs_recovery = (es->s_last_orphan != 0 ||
1927 EXT3_HAS_INCOMPAT_FEATURE(sb,
1928 EXT3_FEATURE_INCOMPAT_RECOVER));
1929
1930 /*
1931 * The first inode we look at is the journal inode. Don't try
1932 * root first: it may be modified in the journal!
1933 */
1934 if (!test_opt(sb, NOLOAD) &&
1935 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1936 if (ext3_load_journal(sb, es, journal_devnum))
41d1a636 1937 goto failed_mount2;
1da177e4
LT		 1938 } else if (journal_inum) {
1939 if (ext3_create_journal(sb, es, journal_inum))
41d1a636 1940 goto failed_mount2;
1da177e4
LT		 1941 } else {
1942 if (!silent)
4cf46b67
AF		 1943 ext3_msg(sb, KERN_ERR,
1944 "error: no journal found. "
1945 "mounting ext3 over ext2?");
41d1a636
DM		 1946 goto failed_mount2;
1947 }
1948 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1949 ext3_count_free_blocks(sb));
1950 if (!err) {
1951 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1952 ext3_count_free_inodes(sb));
1953 }
1954 if (!err) {
1955 err = percpu_counter_init(&sbi->s_dirs_counter,
1956 ext3_count_dirs(sb));
1957 }
1958 if (err) {
1959 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
4569cd1b 1960 ret = err;
0216bfcf 1961 goto failed_mount3;
1da177e4
LT		 1962 }
1963
1964 /* We have now updated the journal if required, so we can
1965 * validate the data journaling mode. */
1966 switch (test_opt(sb, DATA_FLAGS)) {
1967 case 0:
1968 /* No mode set, assume a default based on the journal
1969 capabilities: ORDERED_DATA if the journal can
1970 cope, else JOURNAL_DATA */
1971 if (journal_check_available_features
1972 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 1973 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 1974 else
1975 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1976 break;
1977
1978 case EXT3_MOUNT_ORDERED_DATA:
1979 case EXT3_MOUNT_WRITEBACK_DATA:
1980 if (!journal_check_available_features
1981 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
AF		 1982 ext3_msg(sb, KERN_ERR,
1983 "error: journal does not support "
1984 "requested data journaling mode");
41d1a636 1985 goto failed_mount3;
1da177e4
LT		 1986 }
1987 default:
1988 break;
1989 }
1990
1da177e4
LT		 1991 /*
1992 * The journal_load will have done any necessary log recovery,
1993 * so we can safely mount the rest of the filesystem now.
1994 */
1995
473043dc
DH		 1996 root = ext3_iget(sb, EXT3_ROOT_INO);
1997 if (IS_ERR(root)) {
4cf46b67 1998 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 1999 ret = PTR_ERR(root);
41d1a636 2000 goto failed_mount3;
1da177e4
LT		 2001 }
2002 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2003 iput(root);
4cf46b67 2004 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
41d1a636 2005 goto failed_mount3;
1da177e4 2006 }
473043dc
DH		 2007 sb->s_root = d_alloc_root(root);
2008 if (!sb->s_root) {
4cf46b67 2009 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc
DH		 2010 iput(root);
2011 ret = -ENOMEM;
41d1a636 2012 goto failed_mount3;
473043dc 2013 }
1da177e4
LT		 2014
2015 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ed505ee4 2016
1da177e4
LT		 2017 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2018 ext3_orphan_cleanup(sb, es);
2019 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2020 if (needs_recovery)
4cf46b67 2021 ext3_msg(sb, KERN_INFO, "recovery complete");
1da177e4 2022 ext3_mark_recovery_complete(sb, es);
4cf46b67 2023 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2024 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2025 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2026 "writeback");
2027
1da177e4
LT		 2028 return 0;
2029
2030cantfind_ext3:
2031 if (!silent)
4cf46b67
AF		 2032 ext3_msg(sb, KERN_INFO,
2033 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2034 sb->s_id);
2035 goto failed_mount;
2036
0216bfcf
MC		 2037failed_mount3:
2038 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2039 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2040 percpu_counter_destroy(&sbi->s_dirs_counter);
41d1a636 2041 journal_destroy(sbi->s_journal);
1da177e4
LT		 2042failed_mount2:
2043 for (i = 0; i < db_count; i++)
2044 brelse(sbi->s_group_desc[i]);
2045 kfree(sbi->s_group_desc);
2046failed_mount:
2047#ifdef CONFIG_QUOTA
2048 for (i = 0; i < MAXQUOTAS; i++)
2049 kfree(sbi->s_qf_names[i]);
2050#endif
2051 ext3_blkdev_remove(sbi);
2052 brelse(bh);
2053out_fail:
2054 sb->s_fs_info = NULL;
de5ce037 2055 kfree(sbi->s_blockgroup_lock);
1da177e4 2056 kfree(sbi);
473043dc 2057 return ret;
1da177e4
LT		 2058}
2059
2060/*
2061 * Setup any per-fs journal parameters now. We'll do this both on
2062 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2063 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2064 */
2065static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2066{
2067 struct ext3_sb_info *sbi = EXT3_SB(sb);
2068
2069 if (sbi->s_commit_interval)
2070 journal->j_commit_interval = sbi->s_commit_interval;
2071 /* We could also set up an ext3-specific default for the commit
2072 * interval here, but for now we'll just fall back to the jbd
2073 * default. */
2074
2075 spin_lock(&journal->j_state_lock);
2076 if (test_opt(sb, BARRIER))
2077 journal->j_flags |= JFS_BARRIER;
2078 else
2079 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2080 if (test_opt(sb, DATA_ERR_ABORT))
2081 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2082 else
2083 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2084 spin_unlock(&journal->j_state_lock);
2085}
2086
eee194e7
ES		 2087static journal_t *ext3_get_journal(struct super_block *sb,
2088 unsigned int journal_inum)
1da177e4
LT		 2089{
2090 struct inode *journal_inode;
2091 journal_t *journal;
2092
2093 /* First, test for the existence of a valid inode on disk. Bad
2094 * things happen if we iget() an unused inode, as the subsequent
2095 * iput() will try to delete it. */
2096
473043dc
DH		 2097 journal_inode = ext3_iget(sb, journal_inum);
2098 if (IS_ERR(journal_inode)) {
4cf46b67 2099 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2100 return NULL;
2101 }
2102 if (!journal_inode->i_nlink) {
2103 make_bad_inode(journal_inode);
2104 iput(journal_inode);
4cf46b67 2105 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2106 return NULL;
2107 }
2108
2109 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2110 journal_inode, journal_inode->i_size);
473043dc 2111 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2112 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2113 iput(journal_inode);
2114 return NULL;
2115 }
2116
2117 journal = journal_init_inode(journal_inode);
2118 if (!journal) {
4cf46b67 2119 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2120 iput(journal_inode);
2121 return NULL;
2122 }
2123 journal->j_private = sb;
2124 ext3_init_journal_params(sb, journal);
2125 return journal;
2126}
2127
2128static journal_t *ext3_get_dev_journal(struct super_block *sb,
2129 dev_t j_dev)
2130{
2131 struct buffer_head * bh;
2132 journal_t *journal;
43d23f90 2133 ext3_fsblk_t start;
1c2bf374 2134 ext3_fsblk_t len;
1da177e4 2135 int hblock, blocksize;
43d23f90 2136 ext3_fsblk_t sb_block;
1da177e4
LT		 2137 unsigned long offset;
2138 struct ext3_super_block * es;
2139 struct block_device *bdev;
2140
4cf46b67 2141 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2142 if (bdev == NULL)
2143 return NULL;
2144
2145 if (bd_claim(bdev, sb)) {
4cf46b67
AF		 2146 ext3_msg(sb, KERN_ERR,
2147 "error: failed to claim external journal device");
9a1c3542 2148 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 2149 return NULL;
2150 }
2151
2152 blocksize = sb->s_blocksize;
e1defc4f 2153 hblock = bdev_logical_block_size(bdev);
1da177e4 2154 if (blocksize < hblock) {
4cf46b67
AF		 2155 ext3_msg(sb, KERN_ERR,
2156 "error: blocksize too small for journal device");
1da177e4
LT		 2157 goto out_bdev;
2158 }
2159
2160 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2161 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2162 set_blocksize(bdev, blocksize);
2163 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
AF		 2164 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2165 "external journal");
1da177e4
LT		 2166 goto out_bdev;
2167 }
2168
57e94d86 2169 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 2170 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2171 !(le32_to_cpu(es->s_feature_incompat) &
2172 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
AF		 2173 ext3_msg(sb, KERN_ERR, "error: external journal has "
2174 "bad superblock");
1da177e4
LT		 2175 brelse(bh);
2176 goto out_bdev;
2177 }
2178
2179 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2180 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2181 brelse(bh);
2182 goto out_bdev;
2183 }
2184
2185 len = le32_to_cpu(es->s_blocks_count);
2186 start = sb_block + 1;
2187 brelse(bh); /* we're done with the superblock */
2188
2189 journal = journal_init_dev(bdev, sb->s_bdev,
2190 start, len, blocksize);
2191 if (!journal) {
4cf46b67
AF		 2192 ext3_msg(sb, KERN_ERR,
2193 "error: failed to create device journal");
1da177e4
LT		 2194 goto out_bdev;
2195 }
2196 journal->j_private = sb;
2197 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2198 wait_on_buffer(journal->j_sb_buffer);
2199 if (!buffer_uptodate(journal->j_sb_buffer)) {
4cf46b67 2200 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
1da177e4
LT		 2201 goto out_journal;
2202 }
2203 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
AF		 2204 ext3_msg(sb, KERN_ERR,
2205 "error: external journal has more than one "
2206 "user (unsupported) - %d",
1da177e4
LT		 2207 be32_to_cpu(journal->j_superblock->s_nr_users));
2208 goto out_journal;
2209 }
2210 EXT3_SB(sb)->journal_bdev = bdev;
2211 ext3_init_journal_params(sb, journal);
2212 return journal;
2213out_journal:
2214 journal_destroy(journal);
2215out_bdev:
2216 ext3_blkdev_put(bdev);
2217 return NULL;
2218}
2219
71b96257
JL		 2220static int ext3_load_journal(struct super_block *sb,
2221 struct ext3_super_block *es,
2222 unsigned long journal_devnum)
1da177e4
LT		 2223{
2224 journal_t *journal;
eee194e7 2225 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2226 dev_t journal_dev;
1da177e4
LT		 2227 int err = 0;
2228 int really_read_only;
2229
71b96257
JL		 2230 if (journal_devnum &&
2231 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
AF		 2232 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2233 "numbers have changed");
71b96257
JL		 2234 journal_dev = new_decode_dev(journal_devnum);
2235 } else
2236 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2237
1da177e4
LT		 2238 really_read_only = bdev_read_only(sb->s_bdev);
2239
2240 /*
2241 * Are we loading a blank journal or performing recovery after a
2242 * crash? For recovery, we need to check in advance whether we
2243 * can get read-write access to the device.
2244 */
2245
2246 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2247 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2248 ext3_msg(sb, KERN_INFO,
2249 "recovery required on readonly filesystem");
1da177e4 2250 if (really_read_only) {
4cf46b67
AF		 2251 ext3_msg(sb, KERN_ERR, "error: write access "
2252 "unavailable, cannot proceed");
1da177e4
LT		 2253 return -EROFS;
2254 }
4cf46b67
AF		 2255 ext3_msg(sb, KERN_INFO,
2256 "write access will be enabled during recovery");
1da177e4
LT		 2257 }
2258 }
2259
2260 if (journal_inum && journal_dev) {
4cf46b67
AF		 2261 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2262 "and inode journals");
1da177e4
LT		 2263 return -EINVAL;
2264 }
2265
2266 if (journal_inum) {
2267 if (!(journal = ext3_get_journal(sb, journal_inum)))
2268 return -EINVAL;
2269 } else {
2270 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2271 return -EINVAL;
2272 }
2273
0636c73e
ES		 2274 if (!(journal->j_flags & JFS_BARRIER))
2275 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2276
1da177e4
LT		 2277 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2278 err = journal_update_format(journal);
2279 if (err) {
4cf46b67 2280 ext3_msg(sb, KERN_ERR, "error updating journal");
1da177e4
LT		 2281 journal_destroy(journal);
2282 return err;
2283 }
2284 }
2285
2286 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2287 err = journal_wipe(journal, !really_read_only);
2288 if (!err)
2289 err = journal_load(journal);
2290
2291 if (err) {
4cf46b67 2292 ext3_msg(sb, KERN_ERR, "error loading journal");
1da177e4
LT		 2293 journal_destroy(journal);
2294 return err;
2295 }
2296
2297 EXT3_SB(sb)->s_journal = journal;
2298 ext3_clear_journal_err(sb, es);
71b96257
JL		 2299
2300 if (journal_devnum &&
2301 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2302 es->s_journal_dev = cpu_to_le32(journal_devnum);
71b96257
JL		 2303
2304 /* Make sure we flush the recovery flag to disk. */
2305 ext3_commit_super(sb, es, 1);
2306 }
2307
1da177e4
LT		 2308 return 0;
2309}
2310
4cf46b67
AF		 2311static int ext3_create_journal(struct super_block *sb,
2312 struct ext3_super_block *es,
eee194e7 2313 unsigned int journal_inum)
1da177e4
LT		 2314{
2315 journal_t *journal;
952d9de1 2316 int err;
1da177e4
LT		 2317
2318 if (sb->s_flags & MS_RDONLY) {
4cf46b67
AF		 2319 ext3_msg(sb, KERN_ERR,
2320 "error: readonly filesystem when trying to "
2321 "create journal");
1da177e4
LT		 2322 return -EROFS;
2323 }
2324
952d9de1
BP		 2325 journal = ext3_get_journal(sb, journal_inum);
2326 if (!journal)
1da177e4
LT		 2327 return -EINVAL;
2328
4cf46b67 2329 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
1da177e4
LT		 2330 journal_inum);
2331
952d9de1
BP		 2332 err = journal_create(journal);
2333 if (err) {
4cf46b67 2334 ext3_msg(sb, KERN_ERR, "error creating journal");
1da177e4
LT		 2335 journal_destroy(journal);
2336 return -EIO;
2337 }
2338
2339 EXT3_SB(sb)->s_journal = journal;
2340
2341 ext3_update_dynamic_rev(sb);
2342 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2343 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2344
2345 es->s_journal_inum = cpu_to_le32(journal_inum);
1da177e4
LT		 2346
2347 /* Make sure we flush the recovery flag to disk. */
2348 ext3_commit_super(sb, es, 1);
2349
2350 return 0;
2351}
2352
c4be0c1d
TS		 2353static int ext3_commit_super(struct super_block *sb,
2354 struct ext3_super_block *es,
1da177e4
LT		 2355 int sync)
2356{
2357 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2358 int error = 0;
1da177e4
LT		 2359
2360 if (!sbh)
c4be0c1d 2361 return error;
dff6825e
DW		 2362
2363 if (buffer_write_io_error(sbh)) {
2364 /*
2365 * Oh, dear. A previous attempt to write the
2366 * superblock failed. This could happen because the
2367 * USB device was yanked out. Or it could happen to
2368 * be a transient write error and maybe the block will
2369 * be remapped. Nothing we can do but to retry the
2370 * write and hope for the best.
2371 */
2372 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2373 "superblock detected");
2374 clear_buffer_write_io_error(sbh);
2375 set_buffer_uptodate(sbh);
2376 }
96ec2e0a
TT		 2377 /*
2378 * If the file system is mounted read-only, don't update the
2379 * superblock write time. This avoids updating the superblock
2380 * write time when we are mounting the root file system
2381 * read/only but we need to replay the journal; at that point,
2382 * for people who are east of GMT and who make their clock
2383 * tick in localtime for Windows bug-for-bug compatibility,
2384 * the clock is set in the future, and this will cause e2fsck
2385 * to complain and force a full file system check.
2386 */
2387 if (!(sb->s_flags & MS_RDONLY))
2388 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2389 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2390 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2391 BUFFER_TRACE(sbh, "marking dirty");
2392 mark_buffer_dirty(sbh);
dff6825e 2393 if (sync) {
c4be0c1d 2394 error = sync_dirty_buffer(sbh);
dff6825e
DW		 2395 if (buffer_write_io_error(sbh)) {
2396 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2397 "superblock");
2398 clear_buffer_write_io_error(sbh);
2399 set_buffer_uptodate(sbh);
2400 }
2401 }
c4be0c1d 2402 return error;
1da177e4
LT		 2403}
2404
2405
2406/*
2407 * Have we just finished recovery? If so, and if we are mounting (or
2408 * remounting) the filesystem readonly, then we will end up with a
2409 * consistent fs on disk. Record that fact.
2410 */
2411static void ext3_mark_recovery_complete(struct super_block * sb,
2412 struct ext3_super_block * es)
2413{
2414 journal_t *journal = EXT3_SB(sb)->s_journal;
2415
2416 journal_lock_updates(journal);
2d7c820e
HK		 2417 if (journal_flush(journal) < 0)
2418 goto out;
2419
1da177e4
LT		 2420 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2421 sb->s_flags & MS_RDONLY) {
2422 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2423 ext3_commit_super(sb, es, 1);
2424 }
2d7c820e
HK		 2425
2426out:
1da177e4
LT		 2427 journal_unlock_updates(journal);
2428}
2429
2430/*
2431 * If we are mounting (or read-write remounting) a filesystem whose journal
2432 * has recorded an error from a previous lifetime, move that error to the
2433 * main filesystem now.
2434 */
4cf46b67
AF		 2435static void ext3_clear_journal_err(struct super_block *sb,
2436 struct ext3_super_block *es)
1da177e4
LT		 2437{
2438 journal_t *journal;
2439 int j_errno;
2440 const char *errstr;
2441
2442 journal = EXT3_SB(sb)->s_journal;
2443
2444 /*
2445 * Now check for any error status which may have been recorded in the
2446 * journal by a prior ext3_error() or ext3_abort()
2447 */
2448
2449 j_errno = journal_errno(journal);
2450 if (j_errno) {
2451 char nbuf[16];
2452
2453 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2454 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2455 "from previous mount: %s", errstr);
e05b6b52 2456 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2457 "filesystem check.");
2458
2459 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2460 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2461 ext3_commit_super (sb, es, 1);
2462
2463 journal_clear_err(journal);
2464 }
2465}
2466
2467/*
2468 * Force the running and committing transactions to commit,
2469 * and wait on the commit.
2470 */
2471int ext3_force_commit(struct super_block *sb)
2472{
2473 journal_t *journal;
2474 int ret;
2475
2476 if (sb->s_flags & MS_RDONLY)
2477 return 0;
2478
2479 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2480 ret = ext3_journal_force_commit(journal);
2481 return ret;
2482}
2483
1da177e4
LT		 2484static int ext3_sync_fs(struct super_block *sb, int wait)
2485{
02ac597c 2486 tid_t target;
c87591b7 2487
02ac597c
JK		 2488 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2489 if (wait)
2490 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2491 }
1da177e4
LT		 2492 return 0;
2493}
2494
2495/*
2496 * LVM calls this function before a (read-only) snapshot is created. This
2497 * gives us a chance to flush the journal completely and mark the fs clean.
2498 */
c4be0c1d 2499static int ext3_freeze(struct super_block *sb)
1da177e4 2500{
c4be0c1d
TS		 2501 int error = 0;
2502 journal_t *journal;
1da177e4
LT		 2503
2504 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2505 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2506
2507 /* Now we set up the journal barrier. */
2508 journal_lock_updates(journal);
2d7c820e
HK		 2509
2510 /*
2511 * We don't want to clear needs_recovery flag when we failed
2512 * to flush the journal.
2513 */
c4be0c1d
TS		 2514 error = journal_flush(journal);
2515 if (error < 0)
2516 goto out;
1da177e4
LT		 2517
2518 /* Journal blocked and flushed, clear needs_recovery flag. */
2519 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2520 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2521 if (error)
2522 goto out;
1da177e4 2523 }
c4be0c1d
TS		 2524 return 0;
2525
2526out:
2527 journal_unlock_updates(journal);
2528 return error;
1da177e4
LT		 2529}
2530
2531/*
2532 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2533 * flag here, even though the filesystem is not technically dirty yet.
2534 */
c4be0c1d 2535static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2536{
2537 if (!(sb->s_flags & MS_RDONLY)) {
2538 lock_super(sb);
2539 /* Reser the needs_recovery flag before the fs is unlocked. */
2540 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2541 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2542 unlock_super(sb);
2543 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2544 }
c4be0c1d 2545 return 0;
1da177e4
LT		 2546}
2547
2548static int ext3_remount (struct super_block * sb, int * flags, char * data)
2549{
2550 struct ext3_super_block * es;
2551 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2552 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2553 unsigned long old_sb_flags;
2554 struct ext3_mount_options old_opts;
c79d967d 2555 int enable_quota = 0;
08c6a96f
JK		 2556 int err;
2557#ifdef CONFIG_QUOTA
2558 int i;
2559#endif
2560
2561 /* Store the original options */
bbd6851a 2562 lock_super(sb);
08c6a96f
JK		 2563 old_sb_flags = sb->s_flags;
2564 old_opts.s_mount_opt = sbi->s_mount_opt;
2565 old_opts.s_resuid = sbi->s_resuid;
2566 old_opts.s_resgid = sbi->s_resgid;
2567 old_opts.s_commit_interval = sbi->s_commit_interval;
2568#ifdef CONFIG_QUOTA
2569 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2570 for (i = 0; i < MAXQUOTAS; i++)
2571 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2572#endif
1da177e4
LT		 2573
2574 /*
2575 * Allow the "check" option to be passed as a remount option.
2576 */
71b96257 2577 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2578 err = -EINVAL;
2579 goto restore_opts;
2580 }
1da177e4 2581
e3c96435 2582 if (test_opt(sb, ABORT))
e05b6b52 2583 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2584
2585 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 2586 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 2587
2588 es = sbi->s_es;
2589
2590 ext3_init_journal_params(sb, sbi->s_journal);
2591
2592 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2593 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
e3c96435 2594 if (test_opt(sb, ABORT)) {
08c6a96f
JK		 2595 err = -EROFS;
2596 goto restore_opts;
2597 }
1da177e4
LT		 2598
2599 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 2600 err = dquot_suspend(sb, -1);
2601 if (err < 0)
c79d967d 2602 goto restore_opts;
c79d967d 2603
1da177e4
LT		 2604 /*
2605 * First of all, the unconditional stuff we have to do
2606 * to disable replay of the journal when we next remount
2607 */
2608 sb->s_flags |= MS_RDONLY;
2609
2610 /*
2611 * OK, test if we are remounting a valid rw partition
2612 * readonly, and if so set the rdonly flag and then
2613 * mark the partition as valid again.
2614 */
2615 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2616 (sbi->s_mount_state & EXT3_VALID_FS))
2617 es->s_state = cpu_to_le16(sbi->s_mount_state);
2618
2619 ext3_mark_recovery_complete(sb, es);
2620 } else {
2621 __le32 ret;
2622 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2623 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
AF		 2624 ext3_msg(sb, KERN_WARNING,
2625 "warning: couldn't remount RDWR "
2626 "because of unsupported optional "
2627 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2628 err = -EROFS;
2629 goto restore_opts;
1da177e4 2630 }
ea9a05a1
ES		 2631
2632 /*
2633 * If we have an unprocessed orphan list hanging
2634 * around from a previously readonly bdev mount,
2635 * require a full umount/remount for now.
2636 */
2637 if (es->s_last_orphan) {
4cf46b67 2638 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2639 "remount RDWR because of unprocessed "
2640 "orphan inode list. Please "
4cf46b67 2641 "umount/remount instead.");
ea9a05a1
ES		 2642 err = -EINVAL;
2643 goto restore_opts;
2644 }
2645
1da177e4
LT		 2646 /*
2647 * Mounting a RDONLY partition read-write, so reread
2648 * and store the current valid flag. (It may have
2649 * been changed by e2fsck since we originally mounted
2650 * the partition.)
2651 */
2652 ext3_clear_journal_err(sb, es);
2653 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2654 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2655 goto restore_opts;
1da177e4
LT		 2656 if (!ext3_setup_super (sb, es, 0))
2657 sb->s_flags &= ~MS_RDONLY;
c79d967d 2658 enable_quota = 1;
1da177e4
LT		 2659 }
2660 }
08c6a96f
JK		 2661#ifdef CONFIG_QUOTA
2662 /* Release old quota file names */
2663 for (i = 0; i < MAXQUOTAS; i++)
2664 if (old_opts.s_qf_names[i] &&
2665 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2666 kfree(old_opts.s_qf_names[i]);
2667#endif
bbd6851a 2668 unlock_super(sb);
c79d967d
CH		 2669
2670 if (enable_quota)
0f0dd62f 2671 dquot_resume(sb, -1);
1da177e4 2672 return 0;
08c6a96f
JK		 2673restore_opts:
2674 sb->s_flags = old_sb_flags;
2675 sbi->s_mount_opt = old_opts.s_mount_opt;
2676 sbi->s_resuid = old_opts.s_resuid;
2677 sbi->s_resgid = old_opts.s_resgid;
2678 sbi->s_commit_interval = old_opts.s_commit_interval;
2679#ifdef CONFIG_QUOTA
2680 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2681 for (i = 0; i < MAXQUOTAS; i++) {
2682 if (sbi->s_qf_names[i] &&
2683 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2684 kfree(sbi->s_qf_names[i]);
2685 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2686 }
2687#endif
bbd6851a 2688 unlock_super(sb);
08c6a96f 2689 return err;
1da177e4
LT		 2690}
2691
726c3342 2692static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2693{
726c3342 2694 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2695 struct ext3_sb_info *sbi = EXT3_SB(sb);
2696 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2697 u64 fsid;
1da177e4 2698
a71ce8c6
BP		 2699 if (test_opt(sb, MINIX_DF)) {
2700 sbi->s_overhead_last = 0;
2701 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2702 unsigned long ngroups = sbi->s_groups_count, i;
2703 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2704 smp_rmb();
2705
2706 /*
a71ce8c6
BP		 2707 * Compute the overhead (FS structures). This is constant
2708 * for a given filesystem unless the number of block groups
2709 * changes so we cache the previous value until it does.
1da177e4
LT		 2710 */
2711
2712 /*
2713 * All of the blocks before first_data_block are
2714 * overhead
2715 */
2716 overhead = le32_to_cpu(es->s_first_data_block);
2717
2718 /*
2719 * Add the overhead attributed to the superblock and
2720 * block group descriptors. If the sparse superblocks
2721 * feature is turned on, then not all groups have this.
2722 */
2723 for (i = 0; i < ngroups; i++) {
2724 overhead += ext3_bg_has_super(sb, i) +
2725 ext3_bg_num_gdb(sb, i);
2726 cond_resched();
2727 }
2728
2729 /*
2730 * Every block group has an inode bitmap, a block
2731 * bitmap, and an inode table.
2732 */
a71ce8c6
BP		 2733 overhead += ngroups * (2 + sbi->s_itb_per_group);
2734 sbi->s_overhead_last = overhead;
2735 smp_wmb();
2736 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2737 }
2738
2739 buf->f_type = EXT3_SUPER_MAGIC;
2740 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2741 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2742 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2743 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2744 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2745 buf->f_bavail = 0;
2746 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2747 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2748 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2749 fsid = le64_to_cpup((void *)es->s_uuid) ^
2750 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2751 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2752 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2753 return 0;
2754}
2755
2756/* Helper function for writing quotas on sync - we need to start transaction before quota file
2757 * is locked for write. Otherwise the are possible deadlocks:
2758 * Process 1 Process 2
2759 * ext3_create() quota_sync()
2760 * journal_start() write_dquot()
871a2931 2761 * dquot_initialize() down(dqio_mutex)
d3be915f 2762 * down(dqio_mutex) journal_start()
1da177e4
LT		 2763 *
2764 */
2765
2766#ifdef CONFIG_QUOTA
2767
2768static inline struct inode *dquot_to_inode(struct dquot *dquot)
2769{
2770 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2771}
2772
1da177e4
LT		 2773static int ext3_write_dquot(struct dquot *dquot)
2774{
2775 int ret, err;
2776 handle_t *handle;
2777 struct inode *inode;
2778
2779 inode = dquot_to_inode(dquot);
2780 handle = ext3_journal_start(inode,
1f54587b 2781 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2782 if (IS_ERR(handle))
2783 return PTR_ERR(handle);
2784 ret = dquot_commit(dquot);
2785 err = ext3_journal_stop(handle);
2786 if (!ret)
2787 ret = err;
2788 return ret;
2789}
2790
2791static int ext3_acquire_dquot(struct dquot *dquot)
2792{
2793 int ret, err;
2794 handle_t *handle;
2795
2796 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2797 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2798 if (IS_ERR(handle))
2799 return PTR_ERR(handle);
2800 ret = dquot_acquire(dquot);
2801 err = ext3_journal_stop(handle);
2802 if (!ret)
2803 ret = err;
2804 return ret;
2805}
2806
2807static int ext3_release_dquot(struct dquot *dquot)
2808{
2809 int ret, err;
2810 handle_t *handle;
2811
2812 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2813 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2814 if (IS_ERR(handle)) {
2815 /* Release dquot anyway to avoid endless cycle in dqput() */
2816 dquot_release(dquot);
1da177e4 2817 return PTR_ERR(handle);
9c3013e9 2818 }
1da177e4
LT		 2819 ret = dquot_release(dquot);
2820 err = ext3_journal_stop(handle);
2821 if (!ret)
2822 ret = err;
2823 return ret;
2824}
2825
2826static int ext3_mark_dquot_dirty(struct dquot *dquot)
2827{
99aeaf63 2828 /* Are we journaling quotas? */
1da177e4
LT		 2829 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2830 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2831 dquot_mark_dquot_dirty(dquot);
2832 return ext3_write_dquot(dquot);
2833 } else {
2834 return dquot_mark_dquot_dirty(dquot);
2835 }
2836}
2837
2838static int ext3_write_info(struct super_block *sb, int type)
2839{
2840 int ret, err;
2841 handle_t *handle;
2842
2843 /* Data block + inode block */
2844 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2845 if (IS_ERR(handle))
2846 return PTR_ERR(handle);
2847 ret = dquot_commit_info(sb, type);
2848 err = ext3_journal_stop(handle);
2849 if (!ret)
2850 ret = err;
2851 return ret;
2852}
2853
2854/*
2855 * Turn on quotas during mount time - we need to find
2856 * the quota file and such...
2857 */
2858static int ext3_quota_on_mount(struct super_block *sb, int type)
2859{
287a8095
CH		 2860 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2861 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2862}
2863
2864/*
2865 * Standard function to be called on quota_on
2866 */
2867static int ext3_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 2868 char *name)
1da177e4
LT		 2869{
2870 int err;
8264613d 2871 struct path path;
1da177e4 2872
1f54587b
JK		 2873 if (!test_opt(sb, QUOTA))
2874 return -EINVAL;
9cfe7b90 2875
8264613d 2876 err = kern_path(name, LOOKUP_FOLLOW, &path);
1da177e4
LT		 2877 if (err)
2878 return err;
9cfe7b90 2879
1da177e4 2880 /* Quotafile not on the same filesystem? */
8264613d
AV		 2881 if (path.mnt->mnt_sb != sb) {
2882 path_put(&path);
1da177e4
LT		 2883 return -EXDEV;
2884 }
9cfe7b90
JK		 2885 /* Journaling quota? */
2886 if (EXT3_SB(sb)->s_qf_names[type]) {
2887 /* Quotafile not of fs root? */
8264613d 2888 if (path.dentry->d_parent != sb->s_root)
4cf46b67
AF		 2889 ext3_msg(sb, KERN_WARNING,
2890 "warning: Quota file not on filesystem root. "
2891 "Journaled quota will not work.");
9cfe7b90
JK		 2892 }
2893
2894 /*
2895 * When we journal data on quota file, we have to flush journal to see
2896 * all updates to the file when we bypass pagecache...
2897 */
8264613d 2898 if (ext3_should_journal_data(path.dentry->d_inode)) {
9cfe7b90
JK		 2899 /*
2900 * We don't need to lock updates but journal_flush() could
2901 * otherwise be livelocked...
2902 */
2903 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2904 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2905 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2906 if (err) {
12e1ec9f 2907 path_put(&path);
2d7c820e
HK		 2908 return err;
2909 }
9cfe7b90
JK		 2910 }
2911
287a8095 2912 err = dquot_quota_on_path(sb, type, format_id, &path);
8264613d 2913 path_put(&path);
77e69dac 2914 return err;
1da177e4
LT		 2915}
2916
2917/* Read data from quotafile - avoid pagecache and such because we cannot afford
2918 * acquiring the locks... As quota files are never truncated and quota code
2919 * itself serializes the operations (and noone else should touch the files)
2920 * we don't have to be afraid of races */
2921static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2922 size_t len, loff_t off)
2923{
2924 struct inode *inode = sb_dqopt(sb)->files[type];
2925 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2926 int err = 0;
2927 int offset = off & (sb->s_blocksize - 1);
2928 int tocopy;
2929 size_t toread;
2930 struct buffer_head *bh;
2931 loff_t i_size = i_size_read(inode);
2932
2933 if (off > i_size)
2934 return 0;
2935 if (off+len > i_size)
2936 len = i_size-off;
2937 toread = len;
2938 while (toread > 0) {
2939 tocopy = sb->s_blocksize - offset < toread ?
2940 sb->s_blocksize - offset : toread;
2941 bh = ext3_bread(NULL, inode, blk, 0, &err);
2942 if (err)
2943 return err;
2944 if (!bh) /* A hole? */
2945 memset(data, 0, tocopy);
2946 else
2947 memcpy(data, bh->b_data+offset, tocopy);
2948 brelse(bh);
2949 offset = 0;
2950 toread -= tocopy;
2951 data += tocopy;
2952 blk++;
2953 }
2954 return len;
2955}
2956
2957/* Write to quotafile (we know the transaction is already started and has
2958 * enough credits) */
2959static ssize_t ext3_quota_write(struct super_block *sb, int type,
2960 const char *data, size_t len, loff_t off)
2961{
2962 struct inode *inode = sb_dqopt(sb)->files[type];
2963 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2964 int err = 0;
2965 int offset = off & (sb->s_blocksize - 1);
1da177e4 2966 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
1da177e4
LT		 2967 struct buffer_head *bh;
2968 handle_t *handle = journal_current_handle();
2969
9c3013e9 2970 if (!handle) {
4cf46b67
AF		 2971 ext3_msg(sb, KERN_WARNING,
2972 "warning: quota write (off=%llu, len=%llu)"
2973 " cancelled because transaction is not started.",
9c3013e9
JK		 2974 (unsigned long long)off, (unsigned long long)len);
2975 return -EIO;
2976 }
e5472147
DM		 2977
2978 /*
2979 * Since we account only one data block in transaction credits,
2980 * then it is impossible to cross a block boundary.
2981 */
2982 if (sb->s_blocksize - offset < len) {
2983 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2984 " cancelled because not block aligned",
2985 (unsigned long long)off, (unsigned long long)len);
2986 return -EIO;
2987 }
5c81a419 2988 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
e5472147
DM		 2989 bh = ext3_bread(handle, inode, blk, 1, &err);
2990 if (!bh)
2991 goto out;
2992 if (journal_quota) {
2993 err = ext3_journal_get_write_access(handle, bh);
2994 if (err) {
2995 brelse(bh);
1da177e4 2996 goto out;
1da177e4 2997 }
1da177e4 2998 }
e5472147
DM		 2999 lock_buffer(bh);
3000 memcpy(bh->b_data+offset, data, len);
3001 flush_dcache_page(bh->b_page);
3002 unlock_buffer(bh);
3003 if (journal_quota)
3004 err = ext3_journal_dirty_metadata(handle, bh);
3005 else {
3006 /* Always do at least ordered writes for quotas */
3007 err = ext3_journal_dirty_data(handle, bh);
3008 mark_buffer_dirty(bh);
3009 }
3010 brelse(bh);
1da177e4 3011out:
e5472147 3012 if (err) {
f5c8f7da 3013 mutex_unlock(&inode->i_mutex);
1da177e4 3014 return err;
f5c8f7da 3015 }
e5472147
DM		 3016 if (inode->i_size < off + len) {
3017 i_size_write(inode, off + len);
1da177e4
LT		 3018 EXT3_I(inode)->i_disksize = inode->i_size;
3019 }
3020 inode->i_version++;
3021 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3022 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 3023 mutex_unlock(&inode->i_mutex);
e5472147 3024 return len;
1da177e4
LT		 3025}
3026
3027#endif
3028
152a0836
AV		 3029static struct dentry *ext3_mount(struct file_system_type *fs_type,
3030 int flags, const char *dev_name, void *data)
1da177e4 3031{
152a0836 3032 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
1da177e4
LT		 3033}
3034
3035static struct file_system_type ext3_fs_type = {
3036 .owner = THIS_MODULE,
3037 .name = "ext3",
152a0836 3038 .mount = ext3_mount,
1da177e4
LT		 3039 .kill_sb = kill_block_super,
3040 .fs_flags = FS_REQUIRES_DEV,
3041};
3042
3043static int __init init_ext3_fs(void)
3044{
3045 int err = init_ext3_xattr();
3046 if (err)
3047 return err;
3048 err = init_inodecache();
3049 if (err)
3050 goto out1;
3051 err = register_filesystem(&ext3_fs_type);
3052 if (err)
3053 goto out;
3054 return 0;
3055out:
3056 destroy_inodecache();
3057out1:
e9ad5620 3058 exit_ext3_xattr();
1da177e4
LT		 3059 return err;
3060}
3061
3062static void __exit exit_ext3_fs(void)
3063{
3064 unregister_filesystem(&ext3_fs_type);
3065 destroy_inodecache();
3066 exit_ext3_xattr();
3067}
3068
3069MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3070MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3071MODULE_LICENSE("GPL");
3072module_init(init_ext3_fs)
3073module_exit(exit_ext3_fs)
Linux kernel - Deliverables
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