projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] ext3: fix options parsing
[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
19#include <linux/config.h>
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
24#include <linux/jbd.h>
25#include <linux/ext3_fs.h>
26#include <linux/ext3_jbd.h>
27#include <linux/slab.h>
28#include <linux/init.h>
29#include <linux/blkdev.h>
30#include <linux/parser.h>
31#include <linux/smp_lock.h>
32#include <linux/buffer_head.h>
33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
38#include <asm/uaccess.h>
39#include "xattr.h"
40#include "acl.h"
41
42static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
43static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
44 int);
45static void ext3_commit_super (struct super_block * sb,
46 struct ext3_super_block * es,
47 int sync);
48static void ext3_mark_recovery_complete(struct super_block * sb,
49 struct ext3_super_block * es);
50static void ext3_clear_journal_err(struct super_block * sb,
51 struct ext3_super_block * es);
52static int ext3_sync_fs(struct super_block *sb, int wait);
53static const char *ext3_decode_error(struct super_block * sb, int errno,
54 char nbuf[16]);
55static int ext3_remount (struct super_block * sb, int * flags, char * data);
56static int ext3_statfs (struct super_block * sb, struct kstatfs * buf);
57static void ext3_unlockfs(struct super_block *sb);
58static void ext3_write_super (struct super_block * sb);
59static void ext3_write_super_lockfs(struct super_block *sb);
60
61/*
62 * Wrappers for journal_start/end.
63 *
64 * The only special thing we need to do here is to make sure that all
65 * journal_end calls result in the superblock being marked dirty, so
66 * that sync() will call the filesystem's write_super callback if
67 * appropriate.
68 */
69handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
70{
71 journal_t *journal;
72
73 if (sb->s_flags & MS_RDONLY)
74 return ERR_PTR(-EROFS);
75
76 /* Special case here: if the journal has aborted behind our
77 * backs (eg. EIO in the commit thread), then we still need to
78 * take the FS itself readonly cleanly. */
79 journal = EXT3_SB(sb)->s_journal;
80 if (is_journal_aborted(journal)) {
81 ext3_abort(sb, __FUNCTION__,
82 "Detected aborted journal");
83 return ERR_PTR(-EROFS);
84 }
85
86 return journal_start(journal, nblocks);
87}
88
89/*
90 * The only special thing we need to do here is to make sure that all
91 * journal_stop calls result in the superblock being marked dirty, so
92 * that sync() will call the filesystem's write_super callback if
93 * appropriate.
94 */
95int __ext3_journal_stop(const char *where, handle_t *handle)
96{
97 struct super_block *sb;
98 int err;
99 int rc;
100
101 sb = handle->h_transaction->t_journal->j_private;
102 err = handle->h_err;
103 rc = journal_stop(handle);
104
105 if (!err)
106 err = rc;
107 if (err)
108 __ext3_std_error(sb, where, err);
109 return err;
110}
111
112void ext3_journal_abort_handle(const char *caller, const char *err_fn,
113 struct buffer_head *bh, handle_t *handle, int err)
114{
115 char nbuf[16];
116 const char *errstr = ext3_decode_error(NULL, err, nbuf);
117
118 if (bh)
119 BUFFER_TRACE(bh, "abort");
120
121 if (!handle->h_err)
122 handle->h_err = err;
123
124 if (is_handle_aborted(handle))
125 return;
126
127 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
128 caller, errstr, err_fn);
129
130 journal_abort_handle(handle);
131}
132
133/* Deal with the reporting of failure conditions on a filesystem such as
134 * inconsistencies detected or read IO failures.
135 *
136 * On ext2, we can store the error state of the filesystem in the
137 * superblock. That is not possible on ext3, because we may have other
138 * write ordering constraints on the superblock which prevent us from
139 * writing it out straight away; and given that the journal is about to
140 * be aborted, we can't rely on the current, or future, transactions to
141 * write out the superblock safely.
142 *
143 * We'll just use the journal_abort() error code to record an error in
144 * the journal instead. On recovery, the journal will compain about
145 * that error until we've noted it down and cleared it.
146 */
147
148static void ext3_handle_error(struct super_block *sb)
149{
150 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
151
152 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
153 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
154
155 if (sb->s_flags & MS_RDONLY)
156 return;
157
158 if (test_opt (sb, ERRORS_RO)) {
159 printk (KERN_CRIT "Remounting filesystem read-only\n");
160 sb->s_flags |= MS_RDONLY;
161 } else {
162 journal_t *journal = EXT3_SB(sb)->s_journal;
163
164 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
165 if (journal)
166 journal_abort(journal, -EIO);
167 }
168 if (test_opt(sb, ERRORS_PANIC))
169 panic("EXT3-fs (device %s): panic forced after error\n",
170 sb->s_id);
171 ext3_commit_super(sb, es, 1);
172}
173
174void ext3_error (struct super_block * sb, const char * function,
175 const char * fmt, ...)
176{
177 va_list args;
178
179 va_start(args, fmt);
180 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
181 vprintk(fmt, args);
182 printk("\n");
183 va_end(args);
184
185 ext3_handle_error(sb);
186}
187
188static const char *ext3_decode_error(struct super_block * sb, int errno,
189 char nbuf[16])
190{
191 char *errstr = NULL;
192
193 switch (errno) {
194 case -EIO:
195 errstr = "IO failure";
196 break;
197 case -ENOMEM:
198 errstr = "Out of memory";
199 break;
200 case -EROFS:
201 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
202 errstr = "Journal has aborted";
203 else
204 errstr = "Readonly filesystem";
205 break;
206 default:
207 /* If the caller passed in an extra buffer for unknown
208 * errors, textualise them now. Else we just return
209 * NULL. */
210 if (nbuf) {
211 /* Check for truncated error codes... */
212 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
213 errstr = nbuf;
214 }
215 break;
216 }
217
218 return errstr;
219}
220
221/* __ext3_std_error decodes expected errors from journaling functions
222 * automatically and invokes the appropriate error response. */
223
224void __ext3_std_error (struct super_block * sb, const char * function,
225 int errno)
226{
227 char nbuf[16];
30121624 228 const char *errstr;
1da177e4 229
30121624
ST		 230 /* Special case: if the error is EROFS, and we're not already
231 * inside a transaction, then there's really no point in logging
232 * an error. */
233 if (errno == -EROFS && journal_current_handle() == NULL &&
234 (sb->s_flags & MS_RDONLY))
235 return;
236
237 errstr = ext3_decode_error(sb, errno, nbuf);
1da177e4
LT		 238 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
239 sb->s_id, function, errstr);
240
241 ext3_handle_error(sb);
242}
243
244/*
245 * ext3_abort is a much stronger failure handler than ext3_error. The
246 * abort function may be used to deal with unrecoverable failures such
247 * as journal IO errors or ENOMEM at a critical moment in log management.
248 *
249 * We unconditionally force the filesystem into an ABORT|READONLY state,
250 * unless the error response on the fs has been set to panic in which
251 * case we take the easy way out and panic immediately.
252 */
253
254void ext3_abort (struct super_block * sb, const char * function,
255 const char * fmt, ...)
256{
257 va_list args;
258
259 printk (KERN_CRIT "ext3_abort called.\n");
260
261 va_start(args, fmt);
262 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
263 vprintk(fmt, args);
264 printk("\n");
265 va_end(args);
266
267 if (test_opt(sb, ERRORS_PANIC))
268 panic("EXT3-fs panic from previous error\n");
269
270 if (sb->s_flags & MS_RDONLY)
271 return;
272
273 printk(KERN_CRIT "Remounting filesystem read-only\n");
274 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
275 sb->s_flags |= MS_RDONLY;
276 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
277 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
278}
279
280void ext3_warning (struct super_block * sb, const char * function,
281 const char * fmt, ...)
282{
283 va_list args;
284
285 va_start(args, fmt);
286 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
287 sb->s_id, function);
288 vprintk(fmt, args);
289 printk("\n");
290 va_end(args);
291}
292
293void ext3_update_dynamic_rev(struct super_block *sb)
294{
295 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
296
297 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
298 return;
299
300 ext3_warning(sb, __FUNCTION__,
301 "updating to rev %d because of new feature flag, "
302 "running e2fsck is recommended",
303 EXT3_DYNAMIC_REV);
304
305 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
306 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
307 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
308 /* leave es->s_feature_*compat flags alone */
309 /* es->s_uuid will be set by e2fsck if empty */
310
311 /*
312 * The rest of the superblock fields should be zero, and if not it
313 * means they are likely already in use, so leave them alone. We
314 * can leave it up to e2fsck to clean up any inconsistencies there.
315 */
316}
317
318/*
319 * Open the external journal device
320 */
321static struct block_device *ext3_blkdev_get(dev_t dev)
322{
323 struct block_device *bdev;
324 char b[BDEVNAME_SIZE];
325
326 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
327 if (IS_ERR(bdev))
328 goto fail;
329 return bdev;
330
331fail:
332 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
333 __bdevname(dev, b), PTR_ERR(bdev));
334 return NULL;
335}
336
337/*
338 * Release the journal device
339 */
340static int ext3_blkdev_put(struct block_device *bdev)
341{
342 bd_release(bdev);
343 return blkdev_put(bdev);
344}
345
346static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
347{
348 struct block_device *bdev;
349 int ret = -ENODEV;
350
351 bdev = sbi->journal_bdev;
352 if (bdev) {
353 ret = ext3_blkdev_put(bdev);
354 sbi->journal_bdev = NULL;
355 }
356 return ret;
357}
358
359static inline struct inode *orphan_list_entry(struct list_head *l)
360{
361 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
362}
363
364static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
365{
366 struct list_head *l;
367
368 printk(KERN_ERR "sb orphan head is %d\n",
369 le32_to_cpu(sbi->s_es->s_last_orphan));
370
371 printk(KERN_ERR "sb_info orphan list:\n");
372 list_for_each(l, &sbi->s_orphan) {
373 struct inode *inode = orphan_list_entry(l);
374 printk(KERN_ERR " "
375 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
376 inode->i_sb->s_id, inode->i_ino, inode,
377 inode->i_mode, inode->i_nlink,
378 NEXT_ORPHAN(inode));
379 }
380}
381
382static void ext3_put_super (struct super_block * sb)
383{
384 struct ext3_sb_info *sbi = EXT3_SB(sb);
385 struct ext3_super_block *es = sbi->s_es;
386 int i;
387
388 ext3_xattr_put_super(sb);
389 journal_destroy(sbi->s_journal);
390 if (!(sb->s_flags & MS_RDONLY)) {
391 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
392 es->s_state = cpu_to_le16(sbi->s_mount_state);
393 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
394 mark_buffer_dirty(sbi->s_sbh);
395 ext3_commit_super(sb, es, 1);
396 }
397
398 for (i = 0; i < sbi->s_gdb_count; i++)
399 brelse(sbi->s_group_desc[i]);
400 kfree(sbi->s_group_desc);
401 percpu_counter_destroy(&sbi->s_freeblocks_counter);
402 percpu_counter_destroy(&sbi->s_freeinodes_counter);
403 percpu_counter_destroy(&sbi->s_dirs_counter);
404 brelse(sbi->s_sbh);
405#ifdef CONFIG_QUOTA
406 for (i = 0; i < MAXQUOTAS; i++)
407 kfree(sbi->s_qf_names[i]);
408#endif
409
410 /* Debugging code just in case the in-memory inode orphan list
411 * isn't empty. The on-disk one can be non-empty if we've
412 * detected an error and taken the fs readonly, but the
413 * in-memory list had better be clean by this point. */
414 if (!list_empty(&sbi->s_orphan))
415 dump_orphan_list(sb, sbi);
416 J_ASSERT(list_empty(&sbi->s_orphan));
417
418 invalidate_bdev(sb->s_bdev, 0);
419 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
420 /*
421 * Invalidate the journal device's buffers. We don't want them
422 * floating about in memory - the physical journal device may
423 * hotswapped, and it breaks the `ro-after' testing code.
424 */
425 sync_blockdev(sbi->journal_bdev);
426 invalidate_bdev(sbi->journal_bdev, 0);
427 ext3_blkdev_remove(sbi);
428 }
429 sb->s_fs_info = NULL;
430 kfree(sbi);
431 return;
432}
433
434static kmem_cache_t *ext3_inode_cachep;
435
436/*
437 * Called inside transaction, so use GFP_NOFS
438 */
439static struct inode *ext3_alloc_inode(struct super_block *sb)
440{
441 struct ext3_inode_info *ei;
442
443 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
444 if (!ei)
445 return NULL;
446#ifdef CONFIG_EXT3_FS_POSIX_ACL
447 ei->i_acl = EXT3_ACL_NOT_CACHED;
448 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
449#endif
450 ei->i_block_alloc_info = NULL;
451 ei->vfs_inode.i_version = 1;
452 return &ei->vfs_inode;
453}
454
455static void ext3_destroy_inode(struct inode *inode)
456{
457 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
458}
459
460static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
461{
462 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
463
464 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
465 SLAB_CTOR_CONSTRUCTOR) {
466 INIT_LIST_HEAD(&ei->i_orphan);
467#ifdef CONFIG_EXT3_FS_XATTR
468 init_rwsem(&ei->xattr_sem);
469#endif
470 init_MUTEX(&ei->truncate_sem);
471 inode_init_once(&ei->vfs_inode);
472 }
473}
474
475static int init_inodecache(void)
476{
477 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
478 sizeof(struct ext3_inode_info),
479 0, SLAB_RECLAIM_ACCOUNT,
480 init_once, NULL);
481 if (ext3_inode_cachep == NULL)
482 return -ENOMEM;
483 return 0;
484}
485
486static void destroy_inodecache(void)
487{
488 if (kmem_cache_destroy(ext3_inode_cachep))
489 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
490}
491
492static void ext3_clear_inode(struct inode *inode)
493{
494 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
495#ifdef CONFIG_EXT3_FS_POSIX_ACL
496 if (EXT3_I(inode)->i_acl &&
497 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
498 posix_acl_release(EXT3_I(inode)->i_acl);
499 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
500 }
501 if (EXT3_I(inode)->i_default_acl &&
502 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
503 posix_acl_release(EXT3_I(inode)->i_default_acl);
504 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
505 }
506#endif
507 ext3_discard_reservation(inode);
508 EXT3_I(inode)->i_block_alloc_info = NULL;
509 kfree(rsv);
510}
511
512#ifdef CONFIG_QUOTA
513
514#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
515#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
516
517static int ext3_dquot_initialize(struct inode *inode, int type);
518static int ext3_dquot_drop(struct inode *inode);
519static int ext3_write_dquot(struct dquot *dquot);
520static int ext3_acquire_dquot(struct dquot *dquot);
521static int ext3_release_dquot(struct dquot *dquot);
522static int ext3_mark_dquot_dirty(struct dquot *dquot);
523static int ext3_write_info(struct super_block *sb, int type);
524static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
525static int ext3_quota_on_mount(struct super_block *sb, int type);
526static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
527 size_t len, loff_t off);
528static ssize_t ext3_quota_write(struct super_block *sb, int type,
529 const char *data, size_t len, loff_t off);
530
531static struct dquot_operations ext3_quota_operations = {
532 .initialize = ext3_dquot_initialize,
533 .drop = ext3_dquot_drop,
534 .alloc_space = dquot_alloc_space,
535 .alloc_inode = dquot_alloc_inode,
536 .free_space = dquot_free_space,
537 .free_inode = dquot_free_inode,
538 .transfer = dquot_transfer,
539 .write_dquot = ext3_write_dquot,
540 .acquire_dquot = ext3_acquire_dquot,
541 .release_dquot = ext3_release_dquot,
542 .mark_dirty = ext3_mark_dquot_dirty,
543 .write_info = ext3_write_info
544};
545
546static struct quotactl_ops ext3_qctl_operations = {
547 .quota_on = ext3_quota_on,
548 .quota_off = vfs_quota_off,
549 .quota_sync = vfs_quota_sync,
550 .get_info = vfs_get_dqinfo,
551 .set_info = vfs_set_dqinfo,
552 .get_dqblk = vfs_get_dqblk,
553 .set_dqblk = vfs_set_dqblk
554};
555#endif
556
557static struct super_operations ext3_sops = {
558 .alloc_inode = ext3_alloc_inode,
559 .destroy_inode = ext3_destroy_inode,
560 .read_inode = ext3_read_inode,
561 .write_inode = ext3_write_inode,
562 .dirty_inode = ext3_dirty_inode,
563 .delete_inode = ext3_delete_inode,
564 .put_super = ext3_put_super,
565 .write_super = ext3_write_super,
566 .sync_fs = ext3_sync_fs,
567 .write_super_lockfs = ext3_write_super_lockfs,
568 .unlockfs = ext3_unlockfs,
569 .statfs = ext3_statfs,
570 .remount_fs = ext3_remount,
571 .clear_inode = ext3_clear_inode,
572#ifdef CONFIG_QUOTA
573 .quota_read = ext3_quota_read,
574 .quota_write = ext3_quota_write,
575#endif
576};
577
578struct dentry *ext3_get_parent(struct dentry *child);
579static struct export_operations ext3_export_ops = {
580 .get_parent = ext3_get_parent,
581};
582
583enum {
584 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
585 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
586 Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
587 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
588 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
589 Opt_commit, Opt_journal_update, Opt_journal_inum,
590 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
591 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1f54587b 592 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1da177e4
LT		 593 Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
594};
595
596static match_table_t tokens = {
597 {Opt_bsd_df, "bsddf"},
598 {Opt_minix_df, "minixdf"},
599 {Opt_grpid, "grpid"},
600 {Opt_grpid, "bsdgroups"},
601 {Opt_nogrpid, "nogrpid"},
602 {Opt_nogrpid, "sysvgroups"},
603 {Opt_resgid, "resgid=%u"},
604 {Opt_resuid, "resuid=%u"},
605 {Opt_sb, "sb=%u"},
606 {Opt_err_cont, "errors=continue"},
607 {Opt_err_panic, "errors=panic"},
608 {Opt_err_ro, "errors=remount-ro"},
609 {Opt_nouid32, "nouid32"},
610 {Opt_nocheck, "nocheck"},
611 {Opt_nocheck, "check=none"},
612 {Opt_check, "check"},
613 {Opt_debug, "debug"},
614 {Opt_oldalloc, "oldalloc"},
615 {Opt_orlov, "orlov"},
616 {Opt_user_xattr, "user_xattr"},
617 {Opt_nouser_xattr, "nouser_xattr"},
618 {Opt_acl, "acl"},
619 {Opt_noacl, "noacl"},
620 {Opt_reservation, "reservation"},
621 {Opt_noreservation, "noreservation"},
622 {Opt_noload, "noload"},
623 {Opt_nobh, "nobh"},
624 {Opt_commit, "commit=%u"},
625 {Opt_journal_update, "journal=update"},
626 {Opt_journal_inum, "journal=%u"},
627 {Opt_abort, "abort"},
628 {Opt_data_journal, "data=journal"},
629 {Opt_data_ordered, "data=ordered"},
630 {Opt_data_writeback, "data=writeback"},
631 {Opt_offusrjquota, "usrjquota="},
632 {Opt_usrjquota, "usrjquota=%s"},
633 {Opt_offgrpjquota, "grpjquota="},
634 {Opt_grpjquota, "grpjquota=%s"},
635 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
636 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1f54587b
JK		 637 {Opt_quota, "grpquota"},
638 {Opt_noquota, "noquota"},
639 {Opt_quota, "quota"},
640 {Opt_quota, "usrquota"},
1da177e4
LT		 641 {Opt_barrier, "barrier=%u"},
642 {Opt_err, NULL},
643 {Opt_resize, "resize"},
644};
645
646static unsigned long get_sb_block(void **data)
647{
648 unsigned long sb_block;
649 char *options = (char *) *data;
650
651 if (!options || strncmp(options, "sb=", 3) != 0)
652 return 1; /* Default location */
653 options += 3;
654 sb_block = simple_strtoul(options, &options, 0);
655 if (*options && *options != ',') {
656 printk("EXT3-fs: Invalid sb specification: %s\n",
657 (char *) *data);
658 return 1;
659 }
660 if (*options == ',')
661 options++;
662 *data = (void *) options;
663 return sb_block;
664}
665
666static int parse_options (char * options, struct super_block *sb,
667 unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
668{
669 struct ext3_sb_info *sbi = EXT3_SB(sb);
670 char * p;
671 substring_t args[MAX_OPT_ARGS];
672 int data_opt = 0;
673 int option;
674#ifdef CONFIG_QUOTA
675 int qtype;
676 char *qname;
677#endif
678
679 if (!options)
680 return 1;
681
682 while ((p = strsep (&options, ",")) != NULL) {
683 int token;
684 if (!*p)
685 continue;
686
687 token = match_token(p, tokens, args);
688 switch (token) {
689 case Opt_bsd_df:
690 clear_opt (sbi->s_mount_opt, MINIX_DF);
691 break;
692 case Opt_minix_df:
693 set_opt (sbi->s_mount_opt, MINIX_DF);
694 break;
695 case Opt_grpid:
696 set_opt (sbi->s_mount_opt, GRPID);
697 break;
698 case Opt_nogrpid:
699 clear_opt (sbi->s_mount_opt, GRPID);
700 break;
701 case Opt_resuid:
702 if (match_int(&args[0], &option))
703 return 0;
704 sbi->s_resuid = option;
705 break;
706 case Opt_resgid:
707 if (match_int(&args[0], &option))
708 return 0;
709 sbi->s_resgid = option;
710 break;
711 case Opt_sb:
712 /* handled by get_sb_block() instead of here */
713 /* *sb_block = match_int(&args[0]); */
714 break;
715 case Opt_err_panic:
716 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
717 clear_opt (sbi->s_mount_opt, ERRORS_RO);
718 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
719 break;
720 case Opt_err_ro:
721 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
722 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
723 set_opt (sbi->s_mount_opt, ERRORS_RO);
724 break;
725 case Opt_err_cont:
726 clear_opt (sbi->s_mount_opt, ERRORS_RO);
727 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
728 set_opt (sbi->s_mount_opt, ERRORS_CONT);
729 break;
730 case Opt_nouid32:
731 set_opt (sbi->s_mount_opt, NO_UID32);
732 break;
733 case Opt_check:
734#ifdef CONFIG_EXT3_CHECK
735 set_opt (sbi->s_mount_opt, CHECK);
736#else
737 printk(KERN_ERR
738 "EXT3 Check option not supported\n");
739#endif
740 break;
741 case Opt_nocheck:
742 clear_opt (sbi->s_mount_opt, CHECK);
743 break;
744 case Opt_debug:
745 set_opt (sbi->s_mount_opt, DEBUG);
746 break;
747 case Opt_oldalloc:
748 set_opt (sbi->s_mount_opt, OLDALLOC);
749 break;
750 case Opt_orlov:
751 clear_opt (sbi->s_mount_opt, OLDALLOC);
752 break;
753#ifdef CONFIG_EXT3_FS_XATTR
754 case Opt_user_xattr:
755 set_opt (sbi->s_mount_opt, XATTR_USER);
756 break;
757 case Opt_nouser_xattr:
758 clear_opt (sbi->s_mount_opt, XATTR_USER);
759 break;
760#else
761 case Opt_user_xattr:
762 case Opt_nouser_xattr:
763 printk("EXT3 (no)user_xattr options not supported\n");
764 break;
765#endif
766#ifdef CONFIG_EXT3_FS_POSIX_ACL
767 case Opt_acl:
768 set_opt(sbi->s_mount_opt, POSIX_ACL);
769 break;
770 case Opt_noacl:
771 clear_opt(sbi->s_mount_opt, POSIX_ACL);
772 break;
773#else
774 case Opt_acl:
775 case Opt_noacl:
776 printk("EXT3 (no)acl options not supported\n");
777 break;
778#endif
779 case Opt_reservation:
780 set_opt(sbi->s_mount_opt, RESERVATION);
781 break;
782 case Opt_noreservation:
783 clear_opt(sbi->s_mount_opt, RESERVATION);
784 break;
785 case Opt_journal_update:
786 /* @@@ FIXME */
787 /* Eventually we will want to be able to create
788 a journal file here. For now, only allow the
789 user to specify an existing inode to be the
790 journal file. */
791 if (is_remount) {
792 printk(KERN_ERR "EXT3-fs: cannot specify "
793 "journal on remount\n");
794 return 0;
795 }
796 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
797 break;
798 case Opt_journal_inum:
799 if (is_remount) {
800 printk(KERN_ERR "EXT3-fs: cannot specify "
801 "journal on remount\n");
802 return 0;
803 }
804 if (match_int(&args[0], &option))
805 return 0;
806 *inum = option;
807 break;
808 case Opt_noload:
809 set_opt (sbi->s_mount_opt, NOLOAD);
810 break;
811 case Opt_commit:
812 if (match_int(&args[0], &option))
813 return 0;
814 if (option < 0)
815 return 0;
816 if (option == 0)
817 option = JBD_DEFAULT_MAX_COMMIT_AGE;
818 sbi->s_commit_interval = HZ * option;
819 break;
820 case Opt_data_journal:
821 data_opt = EXT3_MOUNT_JOURNAL_DATA;
822 goto datacheck;
823 case Opt_data_ordered:
824 data_opt = EXT3_MOUNT_ORDERED_DATA;
825 goto datacheck;
826 case Opt_data_writeback:
827 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
828 datacheck:
829 if (is_remount) {
830 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
831 != data_opt) {
832 printk(KERN_ERR
833 "EXT3-fs: cannot change data "
834 "mode on remount\n");
835 return 0;
836 }
837 } else {
838 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
839 sbi->s_mount_opt |= data_opt;
840 }
841 break;
842#ifdef CONFIG_QUOTA
843 case Opt_usrjquota:
844 qtype = USRQUOTA;
845 goto set_qf_name;
846 case Opt_grpjquota:
847 qtype = GRPQUOTA;
848set_qf_name:
849 if (sb_any_quota_enabled(sb)) {
850 printk(KERN_ERR
851 "EXT3-fs: Cannot change journalled "
852 "quota options when quota turned on.\n");
853 return 0;
854 }
855 qname = match_strdup(&args[0]);
856 if (!qname) {
857 printk(KERN_ERR
858 "EXT3-fs: not enough memory for "
859 "storing quotafile name.\n");
860 return 0;
861 }
862 if (sbi->s_qf_names[qtype] &&
863 strcmp(sbi->s_qf_names[qtype], qname)) {
864 printk(KERN_ERR
865 "EXT3-fs: %s quota file already "
866 "specified.\n", QTYPE2NAME(qtype));
867 kfree(qname);
868 return 0;
869 }
870 sbi->s_qf_names[qtype] = qname;
871 if (strchr(sbi->s_qf_names[qtype], '/')) {
872 printk(KERN_ERR
873 "EXT3-fs: quotafile must be on "
874 "filesystem root.\n");
875 kfree(sbi->s_qf_names[qtype]);
876 sbi->s_qf_names[qtype] = NULL;
877 return 0;
878 }
1f54587b 879 set_opt(sbi->s_mount_opt, QUOTA);
1da177e4
LT		 880 break;
881 case Opt_offusrjquota:
882 qtype = USRQUOTA;
883 goto clear_qf_name;
884 case Opt_offgrpjquota:
885 qtype = GRPQUOTA;
886clear_qf_name:
887 if (sb_any_quota_enabled(sb)) {
888 printk(KERN_ERR "EXT3-fs: Cannot change "
889 "journalled quota options when "
890 "quota turned on.\n");
891 return 0;
892 }
08c6a96f
JK		 893 /*
894 * The space will be released later when all options
895 * are confirmed to be correct
896 */
1da177e4
LT		 897 sbi->s_qf_names[qtype] = NULL;
898 break;
899 case Opt_jqfmt_vfsold:
900 sbi->s_jquota_fmt = QFMT_VFS_OLD;
901 break;
902 case Opt_jqfmt_vfsv0:
903 sbi->s_jquota_fmt = QFMT_VFS_V0;
904 break;
1f54587b
JK		 905 case Opt_quota:
906 set_opt(sbi->s_mount_opt, QUOTA);
907 break;
908 case Opt_noquota:
909 if (sb_any_quota_enabled(sb)) {
910 printk(KERN_ERR "EXT3-fs: Cannot change quota "
911 "options when quota turned on.\n");
912 return 0;
913 }
914 clear_opt(sbi->s_mount_opt, QUOTA);
915 break;
1da177e4
LT		 916#else
917 case Opt_usrjquota:
918 case Opt_grpjquota:
919 case Opt_offusrjquota:
920 case Opt_offgrpjquota:
921 case Opt_jqfmt_vfsold:
922 case Opt_jqfmt_vfsv0:
923 printk(KERN_ERR
924 "EXT3-fs: journalled quota options not "
925 "supported.\n");
926 break;
1f54587b
JK		 927 case Opt_quota:
928 case Opt_noquota:
929 break;
1da177e4
LT		 930#endif
931 case Opt_abort:
932 set_opt(sbi->s_mount_opt, ABORT);
933 break;
934 case Opt_barrier:
935 if (match_int(&args[0], &option))
936 return 0;
937 if (option)
938 set_opt(sbi->s_mount_opt, BARRIER);
939 else
940 clear_opt(sbi->s_mount_opt, BARRIER);
941 break;
942 case Opt_ignore:
943 break;
944 case Opt_resize:
08c6a96f 945 if (!is_remount) {
1da177e4
LT		 946 printk("EXT3-fs: resize option only available "
947 "for remount\n");
948 return 0;
949 }
c7f1721e
KZ		 950 if (match_int(&args[0], &option) != 0)
951 return 0;
1da177e4
LT		 952 *n_blocks_count = option;
953 break;
954 case Opt_nobh:
955 set_opt(sbi->s_mount_opt, NOBH);
956 break;
957 default:
958 printk (KERN_ERR
959 "EXT3-fs: Unrecognized mount option \"%s\" "
960 "or missing value\n", p);
961 return 0;
962 }
963 }
964#ifdef CONFIG_QUOTA
965 if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] ||
966 sbi->s_qf_names[GRPQUOTA])) {
967 printk(KERN_ERR
968 "EXT3-fs: journalled quota format not specified.\n");
969 return 0;
970 }
971#endif
972
973 return 1;
974}
975
976static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
977 int read_only)
978{
979 struct ext3_sb_info *sbi = EXT3_SB(sb);
980 int res = 0;
981
982 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
983 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
984 "forcing read-only mode\n");
985 res = MS_RDONLY;
986 }
987 if (read_only)
988 return res;
989 if (!(sbi->s_mount_state & EXT3_VALID_FS))
990 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
991 "running e2fsck is recommended\n");
992 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
993 printk (KERN_WARNING
994 "EXT3-fs warning: mounting fs with errors, "
995 "running e2fsck is recommended\n");
996 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
997 le16_to_cpu(es->s_mnt_count) >=
998 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
999 printk (KERN_WARNING
1000 "EXT3-fs warning: maximal mount count reached, "
1001 "running e2fsck is recommended\n");
1002 else if (le32_to_cpu(es->s_checkinterval) &&
1003 (le32_to_cpu(es->s_lastcheck) +
1004 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1005 printk (KERN_WARNING
1006 "EXT3-fs warning: checktime reached, "
1007 "running e2fsck is recommended\n");
1008#if 0
1009 /* @@@ We _will_ want to clear the valid bit if we find
1010 inconsistencies, to force a fsck at reboot. But for
1011 a plain journaled filesystem we can keep it set as
1012 valid forever! :) */
1013 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1014#endif
1015 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1016 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1017 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1018 es->s_mtime = cpu_to_le32(get_seconds());
1019 ext3_update_dynamic_rev(sb);
1020 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1021
1022 ext3_commit_super(sb, es, 1);
1023 if (test_opt(sb, DEBUG))
1024 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1025 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1026 sb->s_blocksize,
1027 sbi->s_groups_count,
1028 EXT3_BLOCKS_PER_GROUP(sb),
1029 EXT3_INODES_PER_GROUP(sb),
1030 sbi->s_mount_opt);
1031
1032 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1033 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1034 char b[BDEVNAME_SIZE];
1035
1036 printk("external journal on %s\n",
1037 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1038 } else {
1039 printk("internal journal\n");
1040 }
1041#ifdef CONFIG_EXT3_CHECK
1042 if (test_opt (sb, CHECK)) {
1043 ext3_check_blocks_bitmap (sb);
1044 ext3_check_inodes_bitmap (sb);
1045 }
1046#endif
1047 return res;
1048}
1049
1050/* Called at mount-time, super-block is locked */
1051static int ext3_check_descriptors (struct super_block * sb)
1052{
1053 struct ext3_sb_info *sbi = EXT3_SB(sb);
1054 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1055 struct ext3_group_desc * gdp = NULL;
1056 int desc_block = 0;
1057 int i;
1058
1059 ext3_debug ("Checking group descriptors");
1060
1061 for (i = 0; i < sbi->s_groups_count; i++)
1062 {
1063 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1064 gdp = (struct ext3_group_desc *)
1065 sbi->s_group_desc[desc_block++]->b_data;
1066 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1067 le32_to_cpu(gdp->bg_block_bitmap) >=
1068 block + EXT3_BLOCKS_PER_GROUP(sb))
1069 {
1070 ext3_error (sb, "ext3_check_descriptors",
1071 "Block bitmap for group %d"
1072 " not in group (block %lu)!",
1073 i, (unsigned long)
1074 le32_to_cpu(gdp->bg_block_bitmap));
1075 return 0;
1076 }
1077 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1078 le32_to_cpu(gdp->bg_inode_bitmap) >=
1079 block + EXT3_BLOCKS_PER_GROUP(sb))
1080 {
1081 ext3_error (sb, "ext3_check_descriptors",
1082 "Inode bitmap for group %d"
1083 " not in group (block %lu)!",
1084 i, (unsigned long)
1085 le32_to_cpu(gdp->bg_inode_bitmap));
1086 return 0;
1087 }
1088 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1089 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1090 block + EXT3_BLOCKS_PER_GROUP(sb))
1091 {
1092 ext3_error (sb, "ext3_check_descriptors",
1093 "Inode table for group %d"
1094 " not in group (block %lu)!",
1095 i, (unsigned long)
1096 le32_to_cpu(gdp->bg_inode_table));
1097 return 0;
1098 }
1099 block += EXT3_BLOCKS_PER_GROUP(sb);
1100 gdp++;
1101 }
1102
1103 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1104 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1105 return 1;
1106}
1107
1108
1109/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1110 * the superblock) which were deleted from all directories, but held open by
1111 * a process at the time of a crash. We walk the list and try to delete these
1112 * inodes at recovery time (only with a read-write filesystem).
1113 *
1114 * In order to keep the orphan inode chain consistent during traversal (in
1115 * case of crash during recovery), we link each inode into the superblock
1116 * orphan list_head and handle it the same way as an inode deletion during
1117 * normal operation (which journals the operations for us).
1118 *
1119 * We only do an iget() and an iput() on each inode, which is very safe if we
1120 * accidentally point at an in-use or already deleted inode. The worst that
1121 * can happen in this case is that we get a "bit already cleared" message from
1122 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1123 * e2fsck was run on this filesystem, and it must have already done the orphan
1124 * inode cleanup for us, so we can safely abort without any further action.
1125 */
1126static void ext3_orphan_cleanup (struct super_block * sb,
1127 struct ext3_super_block * es)
1128{
1129 unsigned int s_flags = sb->s_flags;
1130 int nr_orphans = 0, nr_truncates = 0;
1131#ifdef CONFIG_QUOTA
1132 int i;
1133#endif
1134 if (!es->s_last_orphan) {
1135 jbd_debug(4, "no orphan inodes to clean up\n");
1136 return;
1137 }
1138
1139 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1140 if (es->s_last_orphan)
1141 jbd_debug(1, "Errors on filesystem, "
1142 "clearing orphan list.\n");
1143 es->s_last_orphan = 0;
1144 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1145 return;
1146 }
1147
1148 if (s_flags & MS_RDONLY) {
1149 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1150 sb->s_id);
1151 sb->s_flags &= ~MS_RDONLY;
1152 }
1153#ifdef CONFIG_QUOTA
1154 /* Needed for iput() to work correctly and not trash data */
1155 sb->s_flags |= MS_ACTIVE;
1156 /* Turn on quotas so that they are updated correctly */
1157 for (i = 0; i < MAXQUOTAS; i++) {
1158 if (EXT3_SB(sb)->s_qf_names[i]) {
1159 int ret = ext3_quota_on_mount(sb, i);
1160 if (ret < 0)
1161 printk(KERN_ERR
1162 "EXT3-fs: Cannot turn on journalled "
1163 "quota: error %d\n", ret);
1164 }
1165 }
1166#endif
1167
1168 while (es->s_last_orphan) {
1169 struct inode *inode;
1170
1171 if (!(inode =
1172 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1173 es->s_last_orphan = 0;
1174 break;
1175 }
1176
1177 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1178 DQUOT_INIT(inode);
1179 if (inode->i_nlink) {
1180 printk(KERN_DEBUG
1181 "%s: truncating inode %ld to %Ld bytes\n",
1182 __FUNCTION__, inode->i_ino, inode->i_size);
1183 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1184 inode->i_ino, inode->i_size);
1185 ext3_truncate(inode);
1186 nr_truncates++;
1187 } else {
1188 printk(KERN_DEBUG
1189 "%s: deleting unreferenced inode %ld\n",
1190 __FUNCTION__, inode->i_ino);
1191 jbd_debug(2, "deleting unreferenced inode %ld\n",
1192 inode->i_ino);
1193 nr_orphans++;
1194 }
1195 iput(inode); /* The delete magic happens here! */
1196 }
1197
1198#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1199
1200 if (nr_orphans)
1201 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1202 sb->s_id, PLURAL(nr_orphans));
1203 if (nr_truncates)
1204 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1205 sb->s_id, PLURAL(nr_truncates));
1206#ifdef CONFIG_QUOTA
1207 /* Turn quotas off */
1208 for (i = 0; i < MAXQUOTAS; i++) {
1209 if (sb_dqopt(sb)->files[i])
1210 vfs_quota_off(sb, i);
1211 }
1212#endif
1213 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1214}
1215
1216#define log2(n) ffz(~(n))
1217
1218/*
1219 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1220 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1221 * We need to be 1 filesystem block less than the 2^32 sector limit.
1222 */
1223static loff_t ext3_max_size(int bits)
1224{
1225 loff_t res = EXT3_NDIR_BLOCKS;
1226 /* This constant is calculated to be the largest file size for a
1227 * dense, 4k-blocksize file such that the total number of
1228 * sectors in the file, including data and all indirect blocks,
1229 * does not exceed 2^32. */
1230 const loff_t upper_limit = 0x1ff7fffd000LL;
1231
1232 res += 1LL << (bits-2);
1233 res += 1LL << (2*(bits-2));
1234 res += 1LL << (3*(bits-2));
1235 res <<= bits;
1236 if (res > upper_limit)
1237 res = upper_limit;
1238 return res;
1239}
1240
1241static unsigned long descriptor_loc(struct super_block *sb,
1242 unsigned long logic_sb_block,
1243 int nr)
1244{
1245 struct ext3_sb_info *sbi = EXT3_SB(sb);
1246 unsigned long bg, first_data_block, first_meta_bg;
1247 int has_super = 0;
1248
1249 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1250 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1251
1252 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1253 nr < first_meta_bg)
1254 return (logic_sb_block + nr + 1);
1255 bg = sbi->s_desc_per_block * nr;
1256 if (ext3_bg_has_super(sb, bg))
1257 has_super = 1;
1258 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1259}
1260
1261
1262static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1263{
1264 struct buffer_head * bh;
1265 struct ext3_super_block *es = NULL;
1266 struct ext3_sb_info *sbi;
1267 unsigned long block;
1268 unsigned long sb_block = get_sb_block(&data);
1269 unsigned long logic_sb_block;
1270 unsigned long offset = 0;
1271 unsigned long journal_inum = 0;
1272 unsigned long def_mount_opts;
1273 struct inode *root;
1274 int blocksize;
1275 int hblock;
1276 int db_count;
1277 int i;
1278 int needs_recovery;
1279 __le32 features;
1280
1281 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1282 if (!sbi)
1283 return -ENOMEM;
1284 sb->s_fs_info = sbi;
1285 memset(sbi, 0, sizeof(*sbi));
1286 sbi->s_mount_opt = 0;
1287 sbi->s_resuid = EXT3_DEF_RESUID;
1288 sbi->s_resgid = EXT3_DEF_RESGID;
1289
1290 unlock_kernel();
1291
1292 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1293 if (!blocksize) {
1294 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1295 goto out_fail;
1296 }
1297
1298 /*
1299 * The ext3 superblock will not be buffer aligned for other than 1kB
1300 * block sizes. We need to calculate the offset from buffer start.
1301 */
1302 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1303 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1304 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1305 } else {
1306 logic_sb_block = sb_block;
1307 }
1308
1309 if (!(bh = sb_bread(sb, logic_sb_block))) {
1310 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1311 goto out_fail;
1312 }
1313 /*
1314 * Note: s_es must be initialized as soon as possible because
1315 * some ext3 macro-instructions depend on its value
1316 */
1317 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1318 sbi->s_es = es;
1319 sb->s_magic = le16_to_cpu(es->s_magic);
1320 if (sb->s_magic != EXT3_SUPER_MAGIC)
1321 goto cantfind_ext3;
1322
1323 /* Set defaults before we parse the mount options */
1324 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1325 if (def_mount_opts & EXT3_DEFM_DEBUG)
1326 set_opt(sbi->s_mount_opt, DEBUG);
1327 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1328 set_opt(sbi->s_mount_opt, GRPID);
1329 if (def_mount_opts & EXT3_DEFM_UID16)
1330 set_opt(sbi->s_mount_opt, NO_UID32);
1331 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1332 set_opt(sbi->s_mount_opt, XATTR_USER);
1333 if (def_mount_opts & EXT3_DEFM_ACL)
1334 set_opt(sbi->s_mount_opt, POSIX_ACL);
1335 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1336 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1337 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1338 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1339 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1340 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1341
1342 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1343 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1344 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1345 set_opt(sbi->s_mount_opt, ERRORS_RO);
1346
1347 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1348 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1349
1350 set_opt(sbi->s_mount_opt, RESERVATION);
1351
1352 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1353 goto failed_mount;
1354
1355 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1356 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1357
1358 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1359 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1360 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1361 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1362 printk(KERN_WARNING
1363 "EXT3-fs warning: feature flags set on rev 0 fs, "
1364 "running e2fsck is recommended\n");
1365 /*
1366 * Check feature flags regardless of the revision level, since we
1367 * previously didn't change the revision level when setting the flags,
1368 * so there is a chance incompat flags are set on a rev 0 filesystem.
1369 */
1370 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1371 if (features) {
1372 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1373 "unsupported optional features (%x).\n",
1374 sb->s_id, le32_to_cpu(features));
1375 goto failed_mount;
1376 }
1377 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1378 if (!(sb->s_flags & MS_RDONLY) && features) {
1379 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1380 "unsupported optional features (%x).\n",
1381 sb->s_id, le32_to_cpu(features));
1382 goto failed_mount;
1383 }
1384 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1385
1386 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1387 blocksize > EXT3_MAX_BLOCK_SIZE) {
1388 printk(KERN_ERR
1389 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1390 blocksize, sb->s_id);
1391 goto failed_mount;
1392 }
1393
1394 hblock = bdev_hardsect_size(sb->s_bdev);
1395 if (sb->s_blocksize != blocksize) {
1396 /*
1397 * Make sure the blocksize for the filesystem is larger
1398 * than the hardware sectorsize for the machine.
1399 */
1400 if (blocksize < hblock) {
1401 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1402 "device blocksize %d.\n", blocksize, hblock);
1403 goto failed_mount;
1404 }
1405
1406 brelse (bh);
1407 sb_set_blocksize(sb, blocksize);
1408 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1409 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1410 bh = sb_bread(sb, logic_sb_block);
1411 if (!bh) {
1412 printk(KERN_ERR
1413 "EXT3-fs: Can't read superblock on 2nd try.\n");
1414 goto failed_mount;
1415 }
1416 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1417 sbi->s_es = es;
1418 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1419 printk (KERN_ERR
1420 "EXT3-fs: Magic mismatch, very weird !\n");
1421 goto failed_mount;
1422 }
1423 }
1424
1425 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1426
1427 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1428 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1429 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1430 } else {
1431 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1432 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1433 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1434 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1435 (sbi->s_inode_size > blocksize)) {
1436 printk (KERN_ERR
1437 "EXT3-fs: unsupported inode size: %d\n",
1438 sbi->s_inode_size);
1439 goto failed_mount;
1440 }
1441 }
1442 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1443 le32_to_cpu(es->s_log_frag_size);
1444 if (blocksize != sbi->s_frag_size) {
1445 printk(KERN_ERR
1446 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1447 sbi->s_frag_size, blocksize);
1448 goto failed_mount;
1449 }
1450 sbi->s_frags_per_block = 1;
1451 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1452 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1453 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1454 if (EXT3_INODE_SIZE(sb) == 0)
1455 goto cantfind_ext3;
1456 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1457 if (sbi->s_inodes_per_block == 0)
1458 goto cantfind_ext3;
1459 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1460 sbi->s_inodes_per_block;
1461 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1462 sbi->s_sbh = bh;
1463 sbi->s_mount_state = le16_to_cpu(es->s_state);
1464 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1465 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1466 for (i=0; i < 4; i++)
1467 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1468 sbi->s_def_hash_version = es->s_def_hash_version;
1469
1470 if (sbi->s_blocks_per_group > blocksize * 8) {
1471 printk (KERN_ERR
1472 "EXT3-fs: #blocks per group too big: %lu\n",
1473 sbi->s_blocks_per_group);
1474 goto failed_mount;
1475 }
1476 if (sbi->s_frags_per_group > blocksize * 8) {
1477 printk (KERN_ERR
1478 "EXT3-fs: #fragments per group too big: %lu\n",
1479 sbi->s_frags_per_group);
1480 goto failed_mount;
1481 }
1482 if (sbi->s_inodes_per_group > blocksize * 8) {
1483 printk (KERN_ERR
1484 "EXT3-fs: #inodes per group too big: %lu\n",
1485 sbi->s_inodes_per_group);
1486 goto failed_mount;
1487 }
1488
1489 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1490 goto cantfind_ext3;
1491 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1492 le32_to_cpu(es->s_first_data_block) +
1493 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1494 EXT3_BLOCKS_PER_GROUP(sb);
1495 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1496 EXT3_DESC_PER_BLOCK(sb);
1497 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1498 GFP_KERNEL);
1499 if (sbi->s_group_desc == NULL) {
1500 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1501 goto failed_mount;
1502 }
1503
1504 percpu_counter_init(&sbi->s_freeblocks_counter);
1505 percpu_counter_init(&sbi->s_freeinodes_counter);
1506 percpu_counter_init(&sbi->s_dirs_counter);
1507 bgl_lock_init(&sbi->s_blockgroup_lock);
1508
1509 for (i = 0; i < db_count; i++) {
1510 block = descriptor_loc(sb, logic_sb_block, i);
1511 sbi->s_group_desc[i] = sb_bread(sb, block);
1512 if (!sbi->s_group_desc[i]) {
1513 printk (KERN_ERR "EXT3-fs: "
1514 "can't read group descriptor %d\n", i);
1515 db_count = i;
1516 goto failed_mount2;
1517 }
1518 }
1519 if (!ext3_check_descriptors (sb)) {
1520 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1521 goto failed_mount2;
1522 }
1523 sbi->s_gdb_count = db_count;
1524 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1525 spin_lock_init(&sbi->s_next_gen_lock);
1526 /* per fileystem reservation list head & lock */
1527 spin_lock_init(&sbi->s_rsv_window_lock);
1528 sbi->s_rsv_window_root = RB_ROOT;
1529 /* Add a single, static dummy reservation to the start of the
1530 * reservation window list --- it gives us a placeholder for
1531 * append-at-start-of-list which makes the allocation logic
1532 * _much_ simpler. */
1533 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1534 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1535 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1536 sbi->s_rsv_window_head.rsv_goal_size = 0;
1537 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1538
1539 /*
1540 * set up enough so that it can read an inode
1541 */
1542 sb->s_op = &ext3_sops;
1543 sb->s_export_op = &ext3_export_ops;
1544 sb->s_xattr = ext3_xattr_handlers;
1545#ifdef CONFIG_QUOTA
1546 sb->s_qcop = &ext3_qctl_operations;
1547 sb->dq_op = &ext3_quota_operations;
1548#endif
1549 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1550
1551 sb->s_root = NULL;
1552
1553 needs_recovery = (es->s_last_orphan != 0 ||
1554 EXT3_HAS_INCOMPAT_FEATURE(sb,
1555 EXT3_FEATURE_INCOMPAT_RECOVER));
1556
1557 /*
1558 * The first inode we look at is the journal inode. Don't try
1559 * root first: it may be modified in the journal!
1560 */
1561 if (!test_opt(sb, NOLOAD) &&
1562 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1563 if (ext3_load_journal(sb, es))
1564 goto failed_mount2;
1565 } else if (journal_inum) {
1566 if (ext3_create_journal(sb, es, journal_inum))
1567 goto failed_mount2;
1568 } else {
1569 if (!silent)
1570 printk (KERN_ERR
1571 "ext3: No journal on filesystem on %s\n",
1572 sb->s_id);
1573 goto failed_mount2;
1574 }
1575
1576 /* We have now updated the journal if required, so we can
1577 * validate the data journaling mode. */
1578 switch (test_opt(sb, DATA_FLAGS)) {
1579 case 0:
1580 /* No mode set, assume a default based on the journal
1581 capabilities: ORDERED_DATA if the journal can
1582 cope, else JOURNAL_DATA */
1583 if (journal_check_available_features
1584 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1585 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1586 else
1587 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1588 break;
1589
1590 case EXT3_MOUNT_ORDERED_DATA:
1591 case EXT3_MOUNT_WRITEBACK_DATA:
1592 if (!journal_check_available_features
1593 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1594 printk(KERN_ERR "EXT3-fs: Journal does not support "
1595 "requested data journaling mode\n");
1596 goto failed_mount3;
1597 }
1598 default:
1599 break;
1600 }
1601
1602 if (test_opt(sb, NOBH)) {
1603 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1604 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1605 "since filesystem blocksize doesn't match "
1606 "pagesize\n");
1607 clear_opt(sbi->s_mount_opt, NOBH);
1608 }
1609 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1610 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1611 "its supported only with writeback mode\n");
1612 clear_opt(sbi->s_mount_opt, NOBH);
1613 }
1614 }
1615 /*
1616 * The journal_load will have done any necessary log recovery,
1617 * so we can safely mount the rest of the filesystem now.
1618 */
1619
1620 root = iget(sb, EXT3_ROOT_INO);
1621 sb->s_root = d_alloc_root(root);
1622 if (!sb->s_root) {
1623 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1624 iput(root);
1625 goto failed_mount3;
1626 }
1627 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1628 dput(sb->s_root);
1629 sb->s_root = NULL;
1630 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1631 goto failed_mount3;
1632 }
1633
1634 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1635 /*
1636 * akpm: core read_super() calls in here with the superblock locked.
1637 * That deadlocks, because orphan cleanup needs to lock the superblock
1638 * in numerous places. Here we just pop the lock - it's relatively
1639 * harmless, because we are now ready to accept write_super() requests,
1640 * and aviro says that's the only reason for hanging onto the
1641 * superblock lock.
1642 */
1643 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1644 ext3_orphan_cleanup(sb, es);
1645 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1646 if (needs_recovery)
1647 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1648 ext3_mark_recovery_complete(sb, es);
1649 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1650 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1651 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1652 "writeback");
1653
1654 percpu_counter_mod(&sbi->s_freeblocks_counter,
1655 ext3_count_free_blocks(sb));
1656 percpu_counter_mod(&sbi->s_freeinodes_counter,
1657 ext3_count_free_inodes(sb));
1658 percpu_counter_mod(&sbi->s_dirs_counter,
1659 ext3_count_dirs(sb));
1660
1661 lock_kernel();
1662 return 0;
1663
1664cantfind_ext3:
1665 if (!silent)
1666 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1667 sb->s_id);
1668 goto failed_mount;
1669
1670failed_mount3:
1671 journal_destroy(sbi->s_journal);
1672failed_mount2:
1673 for (i = 0; i < db_count; i++)
1674 brelse(sbi->s_group_desc[i]);
1675 kfree(sbi->s_group_desc);
1676failed_mount:
1677#ifdef CONFIG_QUOTA
1678 for (i = 0; i < MAXQUOTAS; i++)
1679 kfree(sbi->s_qf_names[i]);
1680#endif
1681 ext3_blkdev_remove(sbi);
1682 brelse(bh);
1683out_fail:
1684 sb->s_fs_info = NULL;
1685 kfree(sbi);
1686 lock_kernel();
1687 return -EINVAL;
1688}
1689
1690/*
1691 * Setup any per-fs journal parameters now. We'll do this both on
1692 * initial mount, once the journal has been initialised but before we've
1693 * done any recovery; and again on any subsequent remount.
1694 */
1695static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1696{
1697 struct ext3_sb_info *sbi = EXT3_SB(sb);
1698
1699 if (sbi->s_commit_interval)
1700 journal->j_commit_interval = sbi->s_commit_interval;
1701 /* We could also set up an ext3-specific default for the commit
1702 * interval here, but for now we'll just fall back to the jbd
1703 * default. */
1704
1705 spin_lock(&journal->j_state_lock);
1706 if (test_opt(sb, BARRIER))
1707 journal->j_flags |= JFS_BARRIER;
1708 else
1709 journal->j_flags &= ~JFS_BARRIER;
1710 spin_unlock(&journal->j_state_lock);
1711}
1712
1713static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1714{
1715 struct inode *journal_inode;
1716 journal_t *journal;
1717
1718 /* First, test for the existence of a valid inode on disk. Bad
1719 * things happen if we iget() an unused inode, as the subsequent
1720 * iput() will try to delete it. */
1721
1722 journal_inode = iget(sb, journal_inum);
1723 if (!journal_inode) {
1724 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1725 return NULL;
1726 }
1727 if (!journal_inode->i_nlink) {
1728 make_bad_inode(journal_inode);
1729 iput(journal_inode);
1730 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1731 return NULL;
1732 }
1733
1734 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1735 journal_inode, journal_inode->i_size);
1736 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1737 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1738 iput(journal_inode);
1739 return NULL;
1740 }
1741
1742 journal = journal_init_inode(journal_inode);
1743 if (!journal) {
1744 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1745 iput(journal_inode);
1746 return NULL;
1747 }
1748 journal->j_private = sb;
1749 ext3_init_journal_params(sb, journal);
1750 return journal;
1751}
1752
1753static journal_t *ext3_get_dev_journal(struct super_block *sb,
1754 dev_t j_dev)
1755{
1756 struct buffer_head * bh;
1757 journal_t *journal;
1758 int start;
1759 int len;
1760 int hblock, blocksize;
1761 unsigned long sb_block;
1762 unsigned long offset;
1763 struct ext3_super_block * es;
1764 struct block_device *bdev;
1765
1766 bdev = ext3_blkdev_get(j_dev);
1767 if (bdev == NULL)
1768 return NULL;
1769
1770 if (bd_claim(bdev, sb)) {
1771 printk(KERN_ERR
1772 "EXT3: failed to claim external journal device.\n");
1773 blkdev_put(bdev);
1774 return NULL;
1775 }
1776
1777 blocksize = sb->s_blocksize;
1778 hblock = bdev_hardsect_size(bdev);
1779 if (blocksize < hblock) {
1780 printk(KERN_ERR
1781 "EXT3-fs: blocksize too small for journal device.\n");
1782 goto out_bdev;
1783 }
1784
1785 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1786 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1787 set_blocksize(bdev, blocksize);
1788 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1789 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1790 "external journal\n");
1791 goto out_bdev;
1792 }
1793
1794 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1795 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1796 !(le32_to_cpu(es->s_feature_incompat) &
1797 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1798 printk(KERN_ERR "EXT3-fs: external journal has "
1799 "bad superblock\n");
1800 brelse(bh);
1801 goto out_bdev;
1802 }
1803
1804 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1805 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1806 brelse(bh);
1807 goto out_bdev;
1808 }
1809
1810 len = le32_to_cpu(es->s_blocks_count);
1811 start = sb_block + 1;
1812 brelse(bh); /* we're done with the superblock */
1813
1814 journal = journal_init_dev(bdev, sb->s_bdev,
1815 start, len, blocksize);
1816 if (!journal) {
1817 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1818 goto out_bdev;
1819 }
1820 journal->j_private = sb;
1821 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1822 wait_on_buffer(journal->j_sb_buffer);
1823 if (!buffer_uptodate(journal->j_sb_buffer)) {
1824 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1825 goto out_journal;
1826 }
1827 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1828 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1829 "user (unsupported) - %d\n",
1830 be32_to_cpu(journal->j_superblock->s_nr_users));
1831 goto out_journal;
1832 }
1833 EXT3_SB(sb)->journal_bdev = bdev;
1834 ext3_init_journal_params(sb, journal);
1835 return journal;
1836out_journal:
1837 journal_destroy(journal);
1838out_bdev:
1839 ext3_blkdev_put(bdev);
1840 return NULL;
1841}
1842
1843static int ext3_load_journal(struct super_block * sb,
1844 struct ext3_super_block * es)
1845{
1846 journal_t *journal;
1847 int journal_inum = le32_to_cpu(es->s_journal_inum);
1848 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1849 int err = 0;
1850 int really_read_only;
1851
1852 really_read_only = bdev_read_only(sb->s_bdev);
1853
1854 /*
1855 * Are we loading a blank journal or performing recovery after a
1856 * crash? For recovery, we need to check in advance whether we
1857 * can get read-write access to the device.
1858 */
1859
1860 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1861 if (sb->s_flags & MS_RDONLY) {
1862 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1863 "required on readonly filesystem.\n");
1864 if (really_read_only) {
1865 printk(KERN_ERR "EXT3-fs: write access "
1866 "unavailable, cannot proceed.\n");
1867 return -EROFS;
1868 }
1869 printk (KERN_INFO "EXT3-fs: write access will "
1870 "be enabled during recovery.\n");
1871 }
1872 }
1873
1874 if (journal_inum && journal_dev) {
1875 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1876 "and inode journals!\n");
1877 return -EINVAL;
1878 }
1879
1880 if (journal_inum) {
1881 if (!(journal = ext3_get_journal(sb, journal_inum)))
1882 return -EINVAL;
1883 } else {
1884 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1885 return -EINVAL;
1886 }
1887
1888 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1889 err = journal_update_format(journal);
1890 if (err) {
1891 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1892 journal_destroy(journal);
1893 return err;
1894 }
1895 }
1896
1897 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1898 err = journal_wipe(journal, !really_read_only);
1899 if (!err)
1900 err = journal_load(journal);
1901
1902 if (err) {
1903 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1904 journal_destroy(journal);
1905 return err;
1906 }
1907
1908 EXT3_SB(sb)->s_journal = journal;
1909 ext3_clear_journal_err(sb, es);
1910 return 0;
1911}
1912
1913static int ext3_create_journal(struct super_block * sb,
1914 struct ext3_super_block * es,
1915 int journal_inum)
1916{
1917 journal_t *journal;
1918
1919 if (sb->s_flags & MS_RDONLY) {
1920 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1921 "create journal.\n");
1922 return -EROFS;
1923 }
1924
1925 if (!(journal = ext3_get_journal(sb, journal_inum)))
1926 return -EINVAL;
1927
1928 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1929 journal_inum);
1930
1931 if (journal_create(journal)) {
1932 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
1933 journal_destroy(journal);
1934 return -EIO;
1935 }
1936
1937 EXT3_SB(sb)->s_journal = journal;
1938
1939 ext3_update_dynamic_rev(sb);
1940 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1941 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
1942
1943 es->s_journal_inum = cpu_to_le32(journal_inum);
1944 sb->s_dirt = 1;
1945
1946 /* Make sure we flush the recovery flag to disk. */
1947 ext3_commit_super(sb, es, 1);
1948
1949 return 0;
1950}
1951
1952static void ext3_commit_super (struct super_block * sb,
1953 struct ext3_super_block * es,
1954 int sync)
1955{
1956 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
1957
1958 if (!sbh)
1959 return;
1960 es->s_wtime = cpu_to_le32(get_seconds());
1961 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
1962 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
1963 BUFFER_TRACE(sbh, "marking dirty");
1964 mark_buffer_dirty(sbh);
1965 if (sync)
1966 sync_dirty_buffer(sbh);
1967}
1968
1969
1970/*
1971 * Have we just finished recovery? If so, and if we are mounting (or
1972 * remounting) the filesystem readonly, then we will end up with a
1973 * consistent fs on disk. Record that fact.
1974 */
1975static void ext3_mark_recovery_complete(struct super_block * sb,
1976 struct ext3_super_block * es)
1977{
1978 journal_t *journal = EXT3_SB(sb)->s_journal;
1979
1980 journal_lock_updates(journal);
1981 journal_flush(journal);
1982 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
1983 sb->s_flags & MS_RDONLY) {
1984 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1985 sb->s_dirt = 0;
1986 ext3_commit_super(sb, es, 1);
1987 }
1988 journal_unlock_updates(journal);
1989}
1990
1991/*
1992 * If we are mounting (or read-write remounting) a filesystem whose journal
1993 * has recorded an error from a previous lifetime, move that error to the
1994 * main filesystem now.
1995 */
1996static void ext3_clear_journal_err(struct super_block * sb,
1997 struct ext3_super_block * es)
1998{
1999 journal_t *journal;
2000 int j_errno;
2001 const char *errstr;
2002
2003 journal = EXT3_SB(sb)->s_journal;
2004
2005 /*
2006 * Now check for any error status which may have been recorded in the
2007 * journal by a prior ext3_error() or ext3_abort()
2008 */
2009
2010 j_errno = journal_errno(journal);
2011 if (j_errno) {
2012 char nbuf[16];
2013
2014 errstr = ext3_decode_error(sb, j_errno, nbuf);
2015 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2016 "from previous mount: %s", errstr);
2017 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2018 "filesystem check.");
2019
2020 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2021 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2022 ext3_commit_super (sb, es, 1);
2023
2024 journal_clear_err(journal);
2025 }
2026}
2027
2028/*
2029 * Force the running and committing transactions to commit,
2030 * and wait on the commit.
2031 */
2032int ext3_force_commit(struct super_block *sb)
2033{
2034 journal_t *journal;
2035 int ret;
2036
2037 if (sb->s_flags & MS_RDONLY)
2038 return 0;
2039
2040 journal = EXT3_SB(sb)->s_journal;
2041 sb->s_dirt = 0;
2042 ret = ext3_journal_force_commit(journal);
2043 return ret;
2044}
2045
2046/*
2047 * Ext3 always journals updates to the superblock itself, so we don't
2048 * have to propagate any other updates to the superblock on disk at this
2049 * point. Just start an async writeback to get the buffers on their way
2050 * to the disk.
2051 *
2052 * This implicitly triggers the writebehind on sync().
2053 */
2054
2055static void ext3_write_super (struct super_block * sb)
2056{
2057 if (down_trylock(&sb->s_lock) == 0)
2058 BUG();
2059 sb->s_dirt = 0;
2060}
2061
2062static int ext3_sync_fs(struct super_block *sb, int wait)
2063{
2064 tid_t target;
2065
2066 sb->s_dirt = 0;
2067 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2068 if (wait)
2069 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2070 }
2071 return 0;
2072}
2073
2074/*
2075 * LVM calls this function before a (read-only) snapshot is created. This
2076 * gives us a chance to flush the journal completely and mark the fs clean.
2077 */
2078static void ext3_write_super_lockfs(struct super_block *sb)
2079{
2080 sb->s_dirt = 0;
2081
2082 if (!(sb->s_flags & MS_RDONLY)) {
2083 journal_t *journal = EXT3_SB(sb)->s_journal;
2084
2085 /* Now we set up the journal barrier. */
2086 journal_lock_updates(journal);
2087 journal_flush(journal);
2088
2089 /* Journal blocked and flushed, clear needs_recovery flag. */
2090 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2091 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2092 }
2093}
2094
2095/*
2096 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2097 * flag here, even though the filesystem is not technically dirty yet.
2098 */
2099static void ext3_unlockfs(struct super_block *sb)
2100{
2101 if (!(sb->s_flags & MS_RDONLY)) {
2102 lock_super(sb);
2103 /* Reser the needs_recovery flag before the fs is unlocked. */
2104 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2105 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2106 unlock_super(sb);
2107 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2108 }
2109}
2110
2111static int ext3_remount (struct super_block * sb, int * flags, char * data)
2112{
2113 struct ext3_super_block * es;
2114 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4 2115 unsigned long n_blocks_count = 0;
08c6a96f
JK		 2116 unsigned long old_sb_flags;
2117 struct ext3_mount_options old_opts;
2118 int err;
2119#ifdef CONFIG_QUOTA
2120 int i;
2121#endif
2122
2123 /* Store the original options */
2124 old_sb_flags = sb->s_flags;
2125 old_opts.s_mount_opt = sbi->s_mount_opt;
2126 old_opts.s_resuid = sbi->s_resuid;
2127 old_opts.s_resgid = sbi->s_resgid;
2128 old_opts.s_commit_interval = sbi->s_commit_interval;
2129#ifdef CONFIG_QUOTA
2130 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2131 for (i = 0; i < MAXQUOTAS; i++)
2132 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2133#endif
1da177e4
LT		 2134
2135 /*
2136 * Allow the "check" option to be passed as a remount option.
2137 */
08c6a96f
JK		 2138 if (!parse_options(data, sb, NULL, &n_blocks_count, 1)) {
2139 err = -EINVAL;
2140 goto restore_opts;
2141 }
1da177e4
LT		 2142
2143 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2144 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2145
2146 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2147 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2148
2149 es = sbi->s_es;
2150
2151 ext3_init_journal_params(sb, sbi->s_journal);
2152
2153 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2154 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
08c6a96f
JK		 2155 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2156 err = -EROFS;
2157 goto restore_opts;
2158 }
1da177e4
LT		 2159
2160 if (*flags & MS_RDONLY) {
2161 /*
2162 * First of all, the unconditional stuff we have to do
2163 * to disable replay of the journal when we next remount
2164 */
2165 sb->s_flags |= MS_RDONLY;
2166
2167 /*
2168 * OK, test if we are remounting a valid rw partition
2169 * readonly, and if so set the rdonly flag and then
2170 * mark the partition as valid again.
2171 */
2172 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2173 (sbi->s_mount_state & EXT3_VALID_FS))
2174 es->s_state = cpu_to_le16(sbi->s_mount_state);
2175
2176 ext3_mark_recovery_complete(sb, es);
2177 } else {
2178 __le32 ret;
2179 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2180 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2181 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2182 "remount RDWR because of unsupported "
2183 "optional features (%x).\n",
2184 sb->s_id, le32_to_cpu(ret));
08c6a96f
JK		 2185 err = -EROFS;
2186 goto restore_opts;
1da177e4
LT		 2187 }
2188 /*
2189 * Mounting a RDONLY partition read-write, so reread
2190 * and store the current valid flag. (It may have
2191 * been changed by e2fsck since we originally mounted
2192 * the partition.)
2193 */
2194 ext3_clear_journal_err(sb, es);
2195 sbi->s_mount_state = le16_to_cpu(es->s_state);
08c6a96f
JK		 2196 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2197 err = ret;
2198 goto restore_opts;
2199 }
1da177e4
LT		 2200 if (!ext3_setup_super (sb, es, 0))
2201 sb->s_flags &= ~MS_RDONLY;
2202 }
2203 }
08c6a96f
JK		 2204#ifdef CONFIG_QUOTA
2205 /* Release old quota file names */
2206 for (i = 0; i < MAXQUOTAS; i++)
2207 if (old_opts.s_qf_names[i] &&
2208 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2209 kfree(old_opts.s_qf_names[i]);
2210#endif
1da177e4 2211 return 0;
08c6a96f
JK		 2212restore_opts:
2213 sb->s_flags = old_sb_flags;
2214 sbi->s_mount_opt = old_opts.s_mount_opt;
2215 sbi->s_resuid = old_opts.s_resuid;
2216 sbi->s_resgid = old_opts.s_resgid;
2217 sbi->s_commit_interval = old_opts.s_commit_interval;
2218#ifdef CONFIG_QUOTA
2219 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2220 for (i = 0; i < MAXQUOTAS; i++) {
2221 if (sbi->s_qf_names[i] &&
2222 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2223 kfree(sbi->s_qf_names[i]);
2224 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2225 }
2226#endif
2227 return err;
1da177e4
LT		 2228}
2229
2230static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2231{
2232 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2233 unsigned long overhead;
2234 int i;
2235
2236 if (test_opt (sb, MINIX_DF))
2237 overhead = 0;
2238 else {
2239 unsigned long ngroups;
2240 ngroups = EXT3_SB(sb)->s_groups_count;
2241 smp_rmb();
2242
2243 /*
2244 * Compute the overhead (FS structures)
2245 */
2246
2247 /*
2248 * All of the blocks before first_data_block are
2249 * overhead
2250 */
2251 overhead = le32_to_cpu(es->s_first_data_block);
2252
2253 /*
2254 * Add the overhead attributed to the superblock and
2255 * block group descriptors. If the sparse superblocks
2256 * feature is turned on, then not all groups have this.
2257 */
2258 for (i = 0; i < ngroups; i++) {
2259 overhead += ext3_bg_has_super(sb, i) +
2260 ext3_bg_num_gdb(sb, i);
2261 cond_resched();
2262 }
2263
2264 /*
2265 * Every block group has an inode bitmap, a block
2266 * bitmap, and an inode table.
2267 */
2268 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2269 }
2270
2271 buf->f_type = EXT3_SUPER_MAGIC;
2272 buf->f_bsize = sb->s_blocksize;
2273 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2274 buf->f_bfree = ext3_count_free_blocks (sb);
2275 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2276 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2277 buf->f_bavail = 0;
2278 buf->f_files = le32_to_cpu(es->s_inodes_count);
2279 buf->f_ffree = ext3_count_free_inodes (sb);
2280 buf->f_namelen = EXT3_NAME_LEN;
2281 return 0;
2282}
2283
2284/* Helper function for writing quotas on sync - we need to start transaction before quota file
2285 * is locked for write. Otherwise the are possible deadlocks:
2286 * Process 1 Process 2
2287 * ext3_create() quota_sync()
2288 * journal_start() write_dquot()
2289 * DQUOT_INIT() down(dqio_sem)
2290 * down(dqio_sem) journal_start()
2291 *
2292 */
2293
2294#ifdef CONFIG_QUOTA
2295
2296static inline struct inode *dquot_to_inode(struct dquot *dquot)
2297{
2298 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2299}
2300
2301static int ext3_dquot_initialize(struct inode *inode, int type)
2302{
2303 handle_t *handle;
2304 int ret, err;
2305
2306 /* We may create quota structure so we need to reserve enough blocks */
1f54587b 2307 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
1da177e4
LT		 2308 if (IS_ERR(handle))
2309 return PTR_ERR(handle);
2310 ret = dquot_initialize(inode, type);
2311 err = ext3_journal_stop(handle);
2312 if (!ret)
2313 ret = err;
2314 return ret;
2315}
2316
2317static int ext3_dquot_drop(struct inode *inode)
2318{
2319 handle_t *handle;
2320 int ret, err;
2321
2322 /* We may delete quota structure so we need to reserve enough blocks */
1f54587b 2323 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
1da177e4
LT		 2324 if (IS_ERR(handle))
2325 return PTR_ERR(handle);
2326 ret = dquot_drop(inode);
2327 err = ext3_journal_stop(handle);
2328 if (!ret)
2329 ret = err;
2330 return ret;
2331}
2332
2333static int ext3_write_dquot(struct dquot *dquot)
2334{
2335 int ret, err;
2336 handle_t *handle;
2337 struct inode *inode;
2338
2339 inode = dquot_to_inode(dquot);
2340 handle = ext3_journal_start(inode,
1f54587b 2341 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2342 if (IS_ERR(handle))
2343 return PTR_ERR(handle);
2344 ret = dquot_commit(dquot);
2345 err = ext3_journal_stop(handle);
2346 if (!ret)
2347 ret = err;
2348 return ret;
2349}
2350
2351static int ext3_acquire_dquot(struct dquot *dquot)
2352{
2353 int ret, err;
2354 handle_t *handle;
2355
2356 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2357 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2358 if (IS_ERR(handle))
2359 return PTR_ERR(handle);
2360 ret = dquot_acquire(dquot);
2361 err = ext3_journal_stop(handle);
2362 if (!ret)
2363 ret = err;
2364 return ret;
2365}
2366
2367static int ext3_release_dquot(struct dquot *dquot)
2368{
2369 int ret, err;
2370 handle_t *handle;
2371
2372 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2373 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2374 if (IS_ERR(handle))
2375 return PTR_ERR(handle);
2376 ret = dquot_release(dquot);
2377 err = ext3_journal_stop(handle);
2378 if (!ret)
2379 ret = err;
2380 return ret;
2381}
2382
2383static int ext3_mark_dquot_dirty(struct dquot *dquot)
2384{
2385 /* Are we journalling quotas? */
2386 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2387 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2388 dquot_mark_dquot_dirty(dquot);
2389 return ext3_write_dquot(dquot);
2390 } else {
2391 return dquot_mark_dquot_dirty(dquot);
2392 }
2393}
2394
2395static int ext3_write_info(struct super_block *sb, int type)
2396{
2397 int ret, err;
2398 handle_t *handle;
2399
2400 /* Data block + inode block */
2401 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2402 if (IS_ERR(handle))
2403 return PTR_ERR(handle);
2404 ret = dquot_commit_info(sb, type);
2405 err = ext3_journal_stop(handle);
2406 if (!ret)
2407 ret = err;
2408 return ret;
2409}
2410
2411/*
2412 * Turn on quotas during mount time - we need to find
2413 * the quota file and such...
2414 */
2415static int ext3_quota_on_mount(struct super_block *sb, int type)
2416{
84de856e
CH		 2417 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2418 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2419}
2420
2421/*
2422 * Standard function to be called on quota_on
2423 */
2424static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2425 char *path)
2426{
2427 int err;
2428 struct nameidata nd;
2429
1f54587b
JK		 2430 if (!test_opt(sb, QUOTA))
2431 return -EINVAL;
1da177e4
LT		 2432 /* Not journalling quota? */
2433 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2434 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2435 return vfs_quota_on(sb, type, format_id, path);
2436 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2437 if (err)
2438 return err;
2439 /* Quotafile not on the same filesystem? */
2440 if (nd.mnt->mnt_sb != sb) {
2441 path_release(&nd);
2442 return -EXDEV;
2443 }
2444 /* Quotafile not of fs root? */
2445 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2446 printk(KERN_WARNING
2447 "EXT3-fs: Quota file not on filesystem root. "
2448 "Journalled quota will not work.\n");
2449 path_release(&nd);
2450 return vfs_quota_on(sb, type, format_id, path);
2451}
2452
2453/* Read data from quotafile - avoid pagecache and such because we cannot afford
2454 * acquiring the locks... As quota files are never truncated and quota code
2455 * itself serializes the operations (and noone else should touch the files)
2456 * we don't have to be afraid of races */
2457static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2458 size_t len, loff_t off)
2459{
2460 struct inode *inode = sb_dqopt(sb)->files[type];
2461 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2462 int err = 0;
2463 int offset = off & (sb->s_blocksize - 1);
2464 int tocopy;
2465 size_t toread;
2466 struct buffer_head *bh;
2467 loff_t i_size = i_size_read(inode);
2468
2469 if (off > i_size)
2470 return 0;
2471 if (off+len > i_size)
2472 len = i_size-off;
2473 toread = len;
2474 while (toread > 0) {
2475 tocopy = sb->s_blocksize - offset < toread ?
2476 sb->s_blocksize - offset : toread;
2477 bh = ext3_bread(NULL, inode, blk, 0, &err);
2478 if (err)
2479 return err;
2480 if (!bh) /* A hole? */
2481 memset(data, 0, tocopy);
2482 else
2483 memcpy(data, bh->b_data+offset, tocopy);
2484 brelse(bh);
2485 offset = 0;
2486 toread -= tocopy;
2487 data += tocopy;
2488 blk++;
2489 }
2490 return len;
2491}
2492
2493/* Write to quotafile (we know the transaction is already started and has
2494 * enough credits) */
2495static ssize_t ext3_quota_write(struct super_block *sb, int type,
2496 const char *data, size_t len, loff_t off)
2497{
2498 struct inode *inode = sb_dqopt(sb)->files[type];
2499 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2500 int err = 0;
2501 int offset = off & (sb->s_blocksize - 1);
2502 int tocopy;
2503 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2504 size_t towrite = len;
2505 struct buffer_head *bh;
2506 handle_t *handle = journal_current_handle();
2507
2508 down(&inode->i_sem);
2509 while (towrite > 0) {
2510 tocopy = sb->s_blocksize - offset < towrite ?
2511 sb->s_blocksize - offset : towrite;
2512 bh = ext3_bread(handle, inode, blk, 1, &err);
2513 if (!bh)
2514 goto out;
2515 if (journal_quota) {
2516 err = ext3_journal_get_write_access(handle, bh);
2517 if (err) {
2518 brelse(bh);
2519 goto out;
2520 }
2521 }
2522 lock_buffer(bh);
2523 memcpy(bh->b_data+offset, data, tocopy);
2524 flush_dcache_page(bh->b_page);
2525 unlock_buffer(bh);
2526 if (journal_quota)
2527 err = ext3_journal_dirty_metadata(handle, bh);
2528 else {
2529 /* Always do at least ordered writes for quotas */
2530 err = ext3_journal_dirty_data(handle, bh);
2531 mark_buffer_dirty(bh);
2532 }
2533 brelse(bh);
2534 if (err)
2535 goto out;
2536 offset = 0;
2537 towrite -= tocopy;
2538 data += tocopy;
2539 blk++;
2540 }
2541out:
2542 if (len == towrite)
2543 return err;
2544 if (inode->i_size < off+len-towrite) {
2545 i_size_write(inode, off+len-towrite);
2546 EXT3_I(inode)->i_disksize = inode->i_size;
2547 }
2548 inode->i_version++;
2549 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2550 ext3_mark_inode_dirty(handle, inode);
2551 up(&inode->i_sem);
2552 return len - towrite;
2553}
2554
2555#endif
2556
2557static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2558 int flags, const char *dev_name, void *data)
2559{
2560 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2561}
2562
2563static struct file_system_type ext3_fs_type = {
2564 .owner = THIS_MODULE,
2565 .name = "ext3",
2566 .get_sb = ext3_get_sb,
2567 .kill_sb = kill_block_super,
2568 .fs_flags = FS_REQUIRES_DEV,
2569};
2570
2571static int __init init_ext3_fs(void)
2572{
2573 int err = init_ext3_xattr();
2574 if (err)
2575 return err;
2576 err = init_inodecache();
2577 if (err)
2578 goto out1;
2579 err = register_filesystem(&ext3_fs_type);
2580 if (err)
2581 goto out;
2582 return 0;
2583out:
2584 destroy_inodecache();
2585out1:
2586 exit_ext3_xattr();
2587 return err;
2588}
2589
2590static void __exit exit_ext3_fs(void)
2591{
2592 unregister_filesystem(&ext3_fs_type);
2593 destroy_inodecache();
2594 exit_ext3_xattr();
2595}
2596
2597MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2598MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2599MODULE_LICENSE("GPL");
2600module_init(init_ext3_fs)
2601module_exit(exit_ext3_fs)
Linux kernel - Deliverables
This page took 0.142588 seconds and 5 git commands to generate.