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1da177e4
LT		 1/*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
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 }
893 kfree(sbi->s_qf_names[qtype]);
894 sbi->s_qf_names[qtype] = NULL;
895 break;
896 case Opt_jqfmt_vfsold:
897 sbi->s_jquota_fmt = QFMT_VFS_OLD;
898 break;
899 case Opt_jqfmt_vfsv0:
900 sbi->s_jquota_fmt = QFMT_VFS_V0;
901 break;
1f54587b
JK		 902 case Opt_quota:
903 set_opt(sbi->s_mount_opt, QUOTA);
904 break;
905 case Opt_noquota:
906 if (sb_any_quota_enabled(sb)) {
907 printk(KERN_ERR "EXT3-fs: Cannot change quota "
908 "options when quota turned on.\n");
909 return 0;
910 }
911 clear_opt(sbi->s_mount_opt, QUOTA);
912 break;
1da177e4
LT		 913#else
914 case Opt_usrjquota:
915 case Opt_grpjquota:
916 case Opt_offusrjquota:
917 case Opt_offgrpjquota:
918 case Opt_jqfmt_vfsold:
919 case Opt_jqfmt_vfsv0:
920 printk(KERN_ERR
921 "EXT3-fs: journalled quota options not "
922 "supported.\n");
923 break;
1f54587b
JK		 924 case Opt_quota:
925 case Opt_noquota:
926 break;
1da177e4
LT		 927#endif
928 case Opt_abort:
929 set_opt(sbi->s_mount_opt, ABORT);
930 break;
931 case Opt_barrier:
932 if (match_int(&args[0], &option))
933 return 0;
934 if (option)
935 set_opt(sbi->s_mount_opt, BARRIER);
936 else
937 clear_opt(sbi->s_mount_opt, BARRIER);
938 break;
939 case Opt_ignore:
940 break;
941 case Opt_resize:
942 if (!n_blocks_count) {
943 printk("EXT3-fs: resize option only available "
944 "for remount\n");
945 return 0;
946 }
947 match_int(&args[0], &option);
948 *n_blocks_count = option;
949 break;
950 case Opt_nobh:
951 set_opt(sbi->s_mount_opt, NOBH);
952 break;
953 default:
954 printk (KERN_ERR
955 "EXT3-fs: Unrecognized mount option \"%s\" "
956 "or missing value\n", p);
957 return 0;
958 }
959 }
960#ifdef CONFIG_QUOTA
961 if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] ||
962 sbi->s_qf_names[GRPQUOTA])) {
963 printk(KERN_ERR
964 "EXT3-fs: journalled quota format not specified.\n");
965 return 0;
966 }
967#endif
968
969 return 1;
970}
971
972static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
973 int read_only)
974{
975 struct ext3_sb_info *sbi = EXT3_SB(sb);
976 int res = 0;
977
978 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
979 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
980 "forcing read-only mode\n");
981 res = MS_RDONLY;
982 }
983 if (read_only)
984 return res;
985 if (!(sbi->s_mount_state & EXT3_VALID_FS))
986 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
987 "running e2fsck is recommended\n");
988 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
989 printk (KERN_WARNING
990 "EXT3-fs warning: mounting fs with errors, "
991 "running e2fsck is recommended\n");
992 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
993 le16_to_cpu(es->s_mnt_count) >=
994 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
995 printk (KERN_WARNING
996 "EXT3-fs warning: maximal mount count reached, "
997 "running e2fsck is recommended\n");
998 else if (le32_to_cpu(es->s_checkinterval) &&
999 (le32_to_cpu(es->s_lastcheck) +
1000 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1001 printk (KERN_WARNING
1002 "EXT3-fs warning: checktime reached, "
1003 "running e2fsck is recommended\n");
1004#if 0
1005 /* @@@ We _will_ want to clear the valid bit if we find
1006 inconsistencies, to force a fsck at reboot. But for
1007 a plain journaled filesystem we can keep it set as
1008 valid forever! :) */
1009 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1010#endif
1011 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1012 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1013 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1014 es->s_mtime = cpu_to_le32(get_seconds());
1015 ext3_update_dynamic_rev(sb);
1016 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1017
1018 ext3_commit_super(sb, es, 1);
1019 if (test_opt(sb, DEBUG))
1020 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1021 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1022 sb->s_blocksize,
1023 sbi->s_groups_count,
1024 EXT3_BLOCKS_PER_GROUP(sb),
1025 EXT3_INODES_PER_GROUP(sb),
1026 sbi->s_mount_opt);
1027
1028 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1029 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1030 char b[BDEVNAME_SIZE];
1031
1032 printk("external journal on %s\n",
1033 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1034 } else {
1035 printk("internal journal\n");
1036 }
1037#ifdef CONFIG_EXT3_CHECK
1038 if (test_opt (sb, CHECK)) {
1039 ext3_check_blocks_bitmap (sb);
1040 ext3_check_inodes_bitmap (sb);
1041 }
1042#endif
1043 return res;
1044}
1045
1046/* Called at mount-time, super-block is locked */
1047static int ext3_check_descriptors (struct super_block * sb)
1048{
1049 struct ext3_sb_info *sbi = EXT3_SB(sb);
1050 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1051 struct ext3_group_desc * gdp = NULL;
1052 int desc_block = 0;
1053 int i;
1054
1055 ext3_debug ("Checking group descriptors");
1056
1057 for (i = 0; i < sbi->s_groups_count; i++)
1058 {
1059 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1060 gdp = (struct ext3_group_desc *)
1061 sbi->s_group_desc[desc_block++]->b_data;
1062 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1063 le32_to_cpu(gdp->bg_block_bitmap) >=
1064 block + EXT3_BLOCKS_PER_GROUP(sb))
1065 {
1066 ext3_error (sb, "ext3_check_descriptors",
1067 "Block bitmap for group %d"
1068 " not in group (block %lu)!",
1069 i, (unsigned long)
1070 le32_to_cpu(gdp->bg_block_bitmap));
1071 return 0;
1072 }
1073 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1074 le32_to_cpu(gdp->bg_inode_bitmap) >=
1075 block + EXT3_BLOCKS_PER_GROUP(sb))
1076 {
1077 ext3_error (sb, "ext3_check_descriptors",
1078 "Inode bitmap for group %d"
1079 " not in group (block %lu)!",
1080 i, (unsigned long)
1081 le32_to_cpu(gdp->bg_inode_bitmap));
1082 return 0;
1083 }
1084 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1085 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1086 block + EXT3_BLOCKS_PER_GROUP(sb))
1087 {
1088 ext3_error (sb, "ext3_check_descriptors",
1089 "Inode table for group %d"
1090 " not in group (block %lu)!",
1091 i, (unsigned long)
1092 le32_to_cpu(gdp->bg_inode_table));
1093 return 0;
1094 }
1095 block += EXT3_BLOCKS_PER_GROUP(sb);
1096 gdp++;
1097 }
1098
1099 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1100 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1101 return 1;
1102}
1103
1104
1105/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1106 * the superblock) which were deleted from all directories, but held open by
1107 * a process at the time of a crash. We walk the list and try to delete these
1108 * inodes at recovery time (only with a read-write filesystem).
1109 *
1110 * In order to keep the orphan inode chain consistent during traversal (in
1111 * case of crash during recovery), we link each inode into the superblock
1112 * orphan list_head and handle it the same way as an inode deletion during
1113 * normal operation (which journals the operations for us).
1114 *
1115 * We only do an iget() and an iput() on each inode, which is very safe if we
1116 * accidentally point at an in-use or already deleted inode. The worst that
1117 * can happen in this case is that we get a "bit already cleared" message from
1118 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1119 * e2fsck was run on this filesystem, and it must have already done the orphan
1120 * inode cleanup for us, so we can safely abort without any further action.
1121 */
1122static void ext3_orphan_cleanup (struct super_block * sb,
1123 struct ext3_super_block * es)
1124{
1125 unsigned int s_flags = sb->s_flags;
1126 int nr_orphans = 0, nr_truncates = 0;
1127#ifdef CONFIG_QUOTA
1128 int i;
1129#endif
1130 if (!es->s_last_orphan) {
1131 jbd_debug(4, "no orphan inodes to clean up\n");
1132 return;
1133 }
1134
1135 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1136 if (es->s_last_orphan)
1137 jbd_debug(1, "Errors on filesystem, "
1138 "clearing orphan list.\n");
1139 es->s_last_orphan = 0;
1140 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1141 return;
1142 }
1143
1144 if (s_flags & MS_RDONLY) {
1145 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1146 sb->s_id);
1147 sb->s_flags &= ~MS_RDONLY;
1148 }
1149#ifdef CONFIG_QUOTA
1150 /* Needed for iput() to work correctly and not trash data */
1151 sb->s_flags |= MS_ACTIVE;
1152 /* Turn on quotas so that they are updated correctly */
1153 for (i = 0; i < MAXQUOTAS; i++) {
1154 if (EXT3_SB(sb)->s_qf_names[i]) {
1155 int ret = ext3_quota_on_mount(sb, i);
1156 if (ret < 0)
1157 printk(KERN_ERR
1158 "EXT3-fs: Cannot turn on journalled "
1159 "quota: error %d\n", ret);
1160 }
1161 }
1162#endif
1163
1164 while (es->s_last_orphan) {
1165 struct inode *inode;
1166
1167 if (!(inode =
1168 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1169 es->s_last_orphan = 0;
1170 break;
1171 }
1172
1173 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1174 DQUOT_INIT(inode);
1175 if (inode->i_nlink) {
1176 printk(KERN_DEBUG
1177 "%s: truncating inode %ld to %Ld bytes\n",
1178 __FUNCTION__, inode->i_ino, inode->i_size);
1179 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1180 inode->i_ino, inode->i_size);
1181 ext3_truncate(inode);
1182 nr_truncates++;
1183 } else {
1184 printk(KERN_DEBUG
1185 "%s: deleting unreferenced inode %ld\n",
1186 __FUNCTION__, inode->i_ino);
1187 jbd_debug(2, "deleting unreferenced inode %ld\n",
1188 inode->i_ino);
1189 nr_orphans++;
1190 }
1191 iput(inode); /* The delete magic happens here! */
1192 }
1193
1194#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1195
1196 if (nr_orphans)
1197 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1198 sb->s_id, PLURAL(nr_orphans));
1199 if (nr_truncates)
1200 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1201 sb->s_id, PLURAL(nr_truncates));
1202#ifdef CONFIG_QUOTA
1203 /* Turn quotas off */
1204 for (i = 0; i < MAXQUOTAS; i++) {
1205 if (sb_dqopt(sb)->files[i])
1206 vfs_quota_off(sb, i);
1207 }
1208#endif
1209 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1210}
1211
1212#define log2(n) ffz(~(n))
1213
1214/*
1215 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1216 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1217 * We need to be 1 filesystem block less than the 2^32 sector limit.
1218 */
1219static loff_t ext3_max_size(int bits)
1220{
1221 loff_t res = EXT3_NDIR_BLOCKS;
1222 /* This constant is calculated to be the largest file size for a
1223 * dense, 4k-blocksize file such that the total number of
1224 * sectors in the file, including data and all indirect blocks,
1225 * does not exceed 2^32. */
1226 const loff_t upper_limit = 0x1ff7fffd000LL;
1227
1228 res += 1LL << (bits-2);
1229 res += 1LL << (2*(bits-2));
1230 res += 1LL << (3*(bits-2));
1231 res <<= bits;
1232 if (res > upper_limit)
1233 res = upper_limit;
1234 return res;
1235}
1236
1237static unsigned long descriptor_loc(struct super_block *sb,
1238 unsigned long logic_sb_block,
1239 int nr)
1240{
1241 struct ext3_sb_info *sbi = EXT3_SB(sb);
1242 unsigned long bg, first_data_block, first_meta_bg;
1243 int has_super = 0;
1244
1245 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1246 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1247
1248 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1249 nr < first_meta_bg)
1250 return (logic_sb_block + nr + 1);
1251 bg = sbi->s_desc_per_block * nr;
1252 if (ext3_bg_has_super(sb, bg))
1253 has_super = 1;
1254 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1255}
1256
1257
1258static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1259{
1260 struct buffer_head * bh;
1261 struct ext3_super_block *es = NULL;
1262 struct ext3_sb_info *sbi;
1263 unsigned long block;
1264 unsigned long sb_block = get_sb_block(&data);
1265 unsigned long logic_sb_block;
1266 unsigned long offset = 0;
1267 unsigned long journal_inum = 0;
1268 unsigned long def_mount_opts;
1269 struct inode *root;
1270 int blocksize;
1271 int hblock;
1272 int db_count;
1273 int i;
1274 int needs_recovery;
1275 __le32 features;
1276
1277 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1278 if (!sbi)
1279 return -ENOMEM;
1280 sb->s_fs_info = sbi;
1281 memset(sbi, 0, sizeof(*sbi));
1282 sbi->s_mount_opt = 0;
1283 sbi->s_resuid = EXT3_DEF_RESUID;
1284 sbi->s_resgid = EXT3_DEF_RESGID;
1285
1286 unlock_kernel();
1287
1288 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1289 if (!blocksize) {
1290 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1291 goto out_fail;
1292 }
1293
1294 /*
1295 * The ext3 superblock will not be buffer aligned for other than 1kB
1296 * block sizes. We need to calculate the offset from buffer start.
1297 */
1298 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1299 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1300 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1301 } else {
1302 logic_sb_block = sb_block;
1303 }
1304
1305 if (!(bh = sb_bread(sb, logic_sb_block))) {
1306 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1307 goto out_fail;
1308 }
1309 /*
1310 * Note: s_es must be initialized as soon as possible because
1311 * some ext3 macro-instructions depend on its value
1312 */
1313 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1314 sbi->s_es = es;
1315 sb->s_magic = le16_to_cpu(es->s_magic);
1316 if (sb->s_magic != EXT3_SUPER_MAGIC)
1317 goto cantfind_ext3;
1318
1319 /* Set defaults before we parse the mount options */
1320 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1321 if (def_mount_opts & EXT3_DEFM_DEBUG)
1322 set_opt(sbi->s_mount_opt, DEBUG);
1323 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1324 set_opt(sbi->s_mount_opt, GRPID);
1325 if (def_mount_opts & EXT3_DEFM_UID16)
1326 set_opt(sbi->s_mount_opt, NO_UID32);
1327 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1328 set_opt(sbi->s_mount_opt, XATTR_USER);
1329 if (def_mount_opts & EXT3_DEFM_ACL)
1330 set_opt(sbi->s_mount_opt, POSIX_ACL);
1331 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1332 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1333 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1334 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1335 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1336 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1337
1338 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1339 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1340 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1341 set_opt(sbi->s_mount_opt, ERRORS_RO);
1342
1343 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1344 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1345
1346 set_opt(sbi->s_mount_opt, RESERVATION);
1347
1348 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1349 goto failed_mount;
1350
1351 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1352 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1353
1354 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1355 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1356 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1357 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1358 printk(KERN_WARNING
1359 "EXT3-fs warning: feature flags set on rev 0 fs, "
1360 "running e2fsck is recommended\n");
1361 /*
1362 * Check feature flags regardless of the revision level, since we
1363 * previously didn't change the revision level when setting the flags,
1364 * so there is a chance incompat flags are set on a rev 0 filesystem.
1365 */
1366 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1367 if (features) {
1368 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1369 "unsupported optional features (%x).\n",
1370 sb->s_id, le32_to_cpu(features));
1371 goto failed_mount;
1372 }
1373 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1374 if (!(sb->s_flags & MS_RDONLY) && features) {
1375 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1376 "unsupported optional features (%x).\n",
1377 sb->s_id, le32_to_cpu(features));
1378 goto failed_mount;
1379 }
1380 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1381
1382 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1383 blocksize > EXT3_MAX_BLOCK_SIZE) {
1384 printk(KERN_ERR
1385 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1386 blocksize, sb->s_id);
1387 goto failed_mount;
1388 }
1389
1390 hblock = bdev_hardsect_size(sb->s_bdev);
1391 if (sb->s_blocksize != blocksize) {
1392 /*
1393 * Make sure the blocksize for the filesystem is larger
1394 * than the hardware sectorsize for the machine.
1395 */
1396 if (blocksize < hblock) {
1397 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1398 "device blocksize %d.\n", blocksize, hblock);
1399 goto failed_mount;
1400 }
1401
1402 brelse (bh);
1403 sb_set_blocksize(sb, blocksize);
1404 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1405 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1406 bh = sb_bread(sb, logic_sb_block);
1407 if (!bh) {
1408 printk(KERN_ERR
1409 "EXT3-fs: Can't read superblock on 2nd try.\n");
1410 goto failed_mount;
1411 }
1412 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1413 sbi->s_es = es;
1414 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1415 printk (KERN_ERR
1416 "EXT3-fs: Magic mismatch, very weird !\n");
1417 goto failed_mount;
1418 }
1419 }
1420
1421 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1422
1423 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1424 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1425 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1426 } else {
1427 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1428 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1429 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1430 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1431 (sbi->s_inode_size > blocksize)) {
1432 printk (KERN_ERR
1433 "EXT3-fs: unsupported inode size: %d\n",
1434 sbi->s_inode_size);
1435 goto failed_mount;
1436 }
1437 }
1438 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1439 le32_to_cpu(es->s_log_frag_size);
1440 if (blocksize != sbi->s_frag_size) {
1441 printk(KERN_ERR
1442 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1443 sbi->s_frag_size, blocksize);
1444 goto failed_mount;
1445 }
1446 sbi->s_frags_per_block = 1;
1447 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1448 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1449 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1450 if (EXT3_INODE_SIZE(sb) == 0)
1451 goto cantfind_ext3;
1452 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1453 if (sbi->s_inodes_per_block == 0)
1454 goto cantfind_ext3;
1455 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1456 sbi->s_inodes_per_block;
1457 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1458 sbi->s_sbh = bh;
1459 sbi->s_mount_state = le16_to_cpu(es->s_state);
1460 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1461 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1462 for (i=0; i < 4; i++)
1463 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1464 sbi->s_def_hash_version = es->s_def_hash_version;
1465
1466 if (sbi->s_blocks_per_group > blocksize * 8) {
1467 printk (KERN_ERR
1468 "EXT3-fs: #blocks per group too big: %lu\n",
1469 sbi->s_blocks_per_group);
1470 goto failed_mount;
1471 }
1472 if (sbi->s_frags_per_group > blocksize * 8) {
1473 printk (KERN_ERR
1474 "EXT3-fs: #fragments per group too big: %lu\n",
1475 sbi->s_frags_per_group);
1476 goto failed_mount;
1477 }
1478 if (sbi->s_inodes_per_group > blocksize * 8) {
1479 printk (KERN_ERR
1480 "EXT3-fs: #inodes per group too big: %lu\n",
1481 sbi->s_inodes_per_group);
1482 goto failed_mount;
1483 }
1484
1485 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1486 goto cantfind_ext3;
1487 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1488 le32_to_cpu(es->s_first_data_block) +
1489 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1490 EXT3_BLOCKS_PER_GROUP(sb);
1491 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1492 EXT3_DESC_PER_BLOCK(sb);
1493 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1494 GFP_KERNEL);
1495 if (sbi->s_group_desc == NULL) {
1496 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1497 goto failed_mount;
1498 }
1499
1500 percpu_counter_init(&sbi->s_freeblocks_counter);
1501 percpu_counter_init(&sbi->s_freeinodes_counter);
1502 percpu_counter_init(&sbi->s_dirs_counter);
1503 bgl_lock_init(&sbi->s_blockgroup_lock);
1504
1505 for (i = 0; i < db_count; i++) {
1506 block = descriptor_loc(sb, logic_sb_block, i);
1507 sbi->s_group_desc[i] = sb_bread(sb, block);
1508 if (!sbi->s_group_desc[i]) {
1509 printk (KERN_ERR "EXT3-fs: "
1510 "can't read group descriptor %d\n", i);
1511 db_count = i;
1512 goto failed_mount2;
1513 }
1514 }
1515 if (!ext3_check_descriptors (sb)) {
1516 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1517 goto failed_mount2;
1518 }
1519 sbi->s_gdb_count = db_count;
1520 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1521 spin_lock_init(&sbi->s_next_gen_lock);
1522 /* per fileystem reservation list head & lock */
1523 spin_lock_init(&sbi->s_rsv_window_lock);
1524 sbi->s_rsv_window_root = RB_ROOT;
1525 /* Add a single, static dummy reservation to the start of the
1526 * reservation window list --- it gives us a placeholder for
1527 * append-at-start-of-list which makes the allocation logic
1528 * _much_ simpler. */
1529 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1530 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1531 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1532 sbi->s_rsv_window_head.rsv_goal_size = 0;
1533 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1534
1535 /*
1536 * set up enough so that it can read an inode
1537 */
1538 sb->s_op = &ext3_sops;
1539 sb->s_export_op = &ext3_export_ops;
1540 sb->s_xattr = ext3_xattr_handlers;
1541#ifdef CONFIG_QUOTA
1542 sb->s_qcop = &ext3_qctl_operations;
1543 sb->dq_op = &ext3_quota_operations;
1544#endif
1545 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1546
1547 sb->s_root = NULL;
1548
1549 needs_recovery = (es->s_last_orphan != 0 ||
1550 EXT3_HAS_INCOMPAT_FEATURE(sb,
1551 EXT3_FEATURE_INCOMPAT_RECOVER));
1552
1553 /*
1554 * The first inode we look at is the journal inode. Don't try
1555 * root first: it may be modified in the journal!
1556 */
1557 if (!test_opt(sb, NOLOAD) &&
1558 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1559 if (ext3_load_journal(sb, es))
1560 goto failed_mount2;
1561 } else if (journal_inum) {
1562 if (ext3_create_journal(sb, es, journal_inum))
1563 goto failed_mount2;
1564 } else {
1565 if (!silent)
1566 printk (KERN_ERR
1567 "ext3: No journal on filesystem on %s\n",
1568 sb->s_id);
1569 goto failed_mount2;
1570 }
1571
1572 /* We have now updated the journal if required, so we can
1573 * validate the data journaling mode. */
1574 switch (test_opt(sb, DATA_FLAGS)) {
1575 case 0:
1576 /* No mode set, assume a default based on the journal
1577 capabilities: ORDERED_DATA if the journal can
1578 cope, else JOURNAL_DATA */
1579 if (journal_check_available_features
1580 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1581 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1582 else
1583 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1584 break;
1585
1586 case EXT3_MOUNT_ORDERED_DATA:
1587 case EXT3_MOUNT_WRITEBACK_DATA:
1588 if (!journal_check_available_features
1589 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1590 printk(KERN_ERR "EXT3-fs: Journal does not support "
1591 "requested data journaling mode\n");
1592 goto failed_mount3;
1593 }
1594 default:
1595 break;
1596 }
1597
1598 if (test_opt(sb, NOBH)) {
1599 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1600 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1601 "since filesystem blocksize doesn't match "
1602 "pagesize\n");
1603 clear_opt(sbi->s_mount_opt, NOBH);
1604 }
1605 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1606 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1607 "its supported only with writeback mode\n");
1608 clear_opt(sbi->s_mount_opt, NOBH);
1609 }
1610 }
1611 /*
1612 * The journal_load will have done any necessary log recovery,
1613 * so we can safely mount the rest of the filesystem now.
1614 */
1615
1616 root = iget(sb, EXT3_ROOT_INO);
1617 sb->s_root = d_alloc_root(root);
1618 if (!sb->s_root) {
1619 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1620 iput(root);
1621 goto failed_mount3;
1622 }
1623 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1624 dput(sb->s_root);
1625 sb->s_root = NULL;
1626 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1627 goto failed_mount3;
1628 }
1629
1630 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1631 /*
1632 * akpm: core read_super() calls in here with the superblock locked.
1633 * That deadlocks, because orphan cleanup needs to lock the superblock
1634 * in numerous places. Here we just pop the lock - it's relatively
1635 * harmless, because we are now ready to accept write_super() requests,
1636 * and aviro says that's the only reason for hanging onto the
1637 * superblock lock.
1638 */
1639 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1640 ext3_orphan_cleanup(sb, es);
1641 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1642 if (needs_recovery)
1643 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1644 ext3_mark_recovery_complete(sb, es);
1645 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1646 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1647 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1648 "writeback");
1649
1650 percpu_counter_mod(&sbi->s_freeblocks_counter,
1651 ext3_count_free_blocks(sb));
1652 percpu_counter_mod(&sbi->s_freeinodes_counter,
1653 ext3_count_free_inodes(sb));
1654 percpu_counter_mod(&sbi->s_dirs_counter,
1655 ext3_count_dirs(sb));
1656
1657 lock_kernel();
1658 return 0;
1659
1660cantfind_ext3:
1661 if (!silent)
1662 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1663 sb->s_id);
1664 goto failed_mount;
1665
1666failed_mount3:
1667 journal_destroy(sbi->s_journal);
1668failed_mount2:
1669 for (i = 0; i < db_count; i++)
1670 brelse(sbi->s_group_desc[i]);
1671 kfree(sbi->s_group_desc);
1672failed_mount:
1673#ifdef CONFIG_QUOTA
1674 for (i = 0; i < MAXQUOTAS; i++)
1675 kfree(sbi->s_qf_names[i]);
1676#endif
1677 ext3_blkdev_remove(sbi);
1678 brelse(bh);
1679out_fail:
1680 sb->s_fs_info = NULL;
1681 kfree(sbi);
1682 lock_kernel();
1683 return -EINVAL;
1684}
1685
1686/*
1687 * Setup any per-fs journal parameters now. We'll do this both on
1688 * initial mount, once the journal has been initialised but before we've
1689 * done any recovery; and again on any subsequent remount.
1690 */
1691static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1692{
1693 struct ext3_sb_info *sbi = EXT3_SB(sb);
1694
1695 if (sbi->s_commit_interval)
1696 journal->j_commit_interval = sbi->s_commit_interval;
1697 /* We could also set up an ext3-specific default for the commit
1698 * interval here, but for now we'll just fall back to the jbd
1699 * default. */
1700
1701 spin_lock(&journal->j_state_lock);
1702 if (test_opt(sb, BARRIER))
1703 journal->j_flags |= JFS_BARRIER;
1704 else
1705 journal->j_flags &= ~JFS_BARRIER;
1706 spin_unlock(&journal->j_state_lock);
1707}
1708
1709static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1710{
1711 struct inode *journal_inode;
1712 journal_t *journal;
1713
1714 /* First, test for the existence of a valid inode on disk. Bad
1715 * things happen if we iget() an unused inode, as the subsequent
1716 * iput() will try to delete it. */
1717
1718 journal_inode = iget(sb, journal_inum);
1719 if (!journal_inode) {
1720 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1721 return NULL;
1722 }
1723 if (!journal_inode->i_nlink) {
1724 make_bad_inode(journal_inode);
1725 iput(journal_inode);
1726 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1727 return NULL;
1728 }
1729
1730 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1731 journal_inode, journal_inode->i_size);
1732 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1733 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1734 iput(journal_inode);
1735 return NULL;
1736 }
1737
1738 journal = journal_init_inode(journal_inode);
1739 if (!journal) {
1740 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1741 iput(journal_inode);
1742 return NULL;
1743 }
1744 journal->j_private = sb;
1745 ext3_init_journal_params(sb, journal);
1746 return journal;
1747}
1748
1749static journal_t *ext3_get_dev_journal(struct super_block *sb,
1750 dev_t j_dev)
1751{
1752 struct buffer_head * bh;
1753 journal_t *journal;
1754 int start;
1755 int len;
1756 int hblock, blocksize;
1757 unsigned long sb_block;
1758 unsigned long offset;
1759 struct ext3_super_block * es;
1760 struct block_device *bdev;
1761
1762 bdev = ext3_blkdev_get(j_dev);
1763 if (bdev == NULL)
1764 return NULL;
1765
1766 if (bd_claim(bdev, sb)) {
1767 printk(KERN_ERR
1768 "EXT3: failed to claim external journal device.\n");
1769 blkdev_put(bdev);
1770 return NULL;
1771 }
1772
1773 blocksize = sb->s_blocksize;
1774 hblock = bdev_hardsect_size(bdev);
1775 if (blocksize < hblock) {
1776 printk(KERN_ERR
1777 "EXT3-fs: blocksize too small for journal device.\n");
1778 goto out_bdev;
1779 }
1780
1781 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1782 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1783 set_blocksize(bdev, blocksize);
1784 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1785 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1786 "external journal\n");
1787 goto out_bdev;
1788 }
1789
1790 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1791 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1792 !(le32_to_cpu(es->s_feature_incompat) &
1793 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1794 printk(KERN_ERR "EXT3-fs: external journal has "
1795 "bad superblock\n");
1796 brelse(bh);
1797 goto out_bdev;
1798 }
1799
1800 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1801 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1802 brelse(bh);
1803 goto out_bdev;
1804 }
1805
1806 len = le32_to_cpu(es->s_blocks_count);
1807 start = sb_block + 1;
1808 brelse(bh); /* we're done with the superblock */
1809
1810 journal = journal_init_dev(bdev, sb->s_bdev,
1811 start, len, blocksize);
1812 if (!journal) {
1813 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1814 goto out_bdev;
1815 }
1816 journal->j_private = sb;
1817 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1818 wait_on_buffer(journal->j_sb_buffer);
1819 if (!buffer_uptodate(journal->j_sb_buffer)) {
1820 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1821 goto out_journal;
1822 }
1823 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1824 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1825 "user (unsupported) - %d\n",
1826 be32_to_cpu(journal->j_superblock->s_nr_users));
1827 goto out_journal;
1828 }
1829 EXT3_SB(sb)->journal_bdev = bdev;
1830 ext3_init_journal_params(sb, journal);
1831 return journal;
1832out_journal:
1833 journal_destroy(journal);
1834out_bdev:
1835 ext3_blkdev_put(bdev);
1836 return NULL;
1837}
1838
1839static int ext3_load_journal(struct super_block * sb,
1840 struct ext3_super_block * es)
1841{
1842 journal_t *journal;
1843 int journal_inum = le32_to_cpu(es->s_journal_inum);
1844 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1845 int err = 0;
1846 int really_read_only;
1847
1848 really_read_only = bdev_read_only(sb->s_bdev);
1849
1850 /*
1851 * Are we loading a blank journal or performing recovery after a
1852 * crash? For recovery, we need to check in advance whether we
1853 * can get read-write access to the device.
1854 */
1855
1856 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1857 if (sb->s_flags & MS_RDONLY) {
1858 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1859 "required on readonly filesystem.\n");
1860 if (really_read_only) {
1861 printk(KERN_ERR "EXT3-fs: write access "
1862 "unavailable, cannot proceed.\n");
1863 return -EROFS;
1864 }
1865 printk (KERN_INFO "EXT3-fs: write access will "
1866 "be enabled during recovery.\n");
1867 }
1868 }
1869
1870 if (journal_inum && journal_dev) {
1871 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1872 "and inode journals!\n");
1873 return -EINVAL;
1874 }
1875
1876 if (journal_inum) {
1877 if (!(journal = ext3_get_journal(sb, journal_inum)))
1878 return -EINVAL;
1879 } else {
1880 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1881 return -EINVAL;
1882 }
1883
1884 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1885 err = journal_update_format(journal);
1886 if (err) {
1887 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1888 journal_destroy(journal);
1889 return err;
1890 }
1891 }
1892
1893 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1894 err = journal_wipe(journal, !really_read_only);
1895 if (!err)
1896 err = journal_load(journal);
1897
1898 if (err) {
1899 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1900 journal_destroy(journal);
1901 return err;
1902 }
1903
1904 EXT3_SB(sb)->s_journal = journal;
1905 ext3_clear_journal_err(sb, es);
1906 return 0;
1907}
1908
1909static int ext3_create_journal(struct super_block * sb,
1910 struct ext3_super_block * es,
1911 int journal_inum)
1912{
1913 journal_t *journal;
1914
1915 if (sb->s_flags & MS_RDONLY) {
1916 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1917 "create journal.\n");
1918 return -EROFS;
1919 }
1920
1921 if (!(journal = ext3_get_journal(sb, journal_inum)))
1922 return -EINVAL;
1923
1924 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1925 journal_inum);
1926
1927 if (journal_create(journal)) {
1928 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
1929 journal_destroy(journal);
1930 return -EIO;
1931 }
1932
1933 EXT3_SB(sb)->s_journal = journal;
1934
1935 ext3_update_dynamic_rev(sb);
1936 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1937 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
1938
1939 es->s_journal_inum = cpu_to_le32(journal_inum);
1940 sb->s_dirt = 1;
1941
1942 /* Make sure we flush the recovery flag to disk. */
1943 ext3_commit_super(sb, es, 1);
1944
1945 return 0;
1946}
1947
1948static void ext3_commit_super (struct super_block * sb,
1949 struct ext3_super_block * es,
1950 int sync)
1951{
1952 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
1953
1954 if (!sbh)
1955 return;
1956 es->s_wtime = cpu_to_le32(get_seconds());
1957 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
1958 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
1959 BUFFER_TRACE(sbh, "marking dirty");
1960 mark_buffer_dirty(sbh);
1961 if (sync)
1962 sync_dirty_buffer(sbh);
1963}
1964
1965
1966/*
1967 * Have we just finished recovery? If so, and if we are mounting (or
1968 * remounting) the filesystem readonly, then we will end up with a
1969 * consistent fs on disk. Record that fact.
1970 */
1971static void ext3_mark_recovery_complete(struct super_block * sb,
1972 struct ext3_super_block * es)
1973{
1974 journal_t *journal = EXT3_SB(sb)->s_journal;
1975
1976 journal_lock_updates(journal);
1977 journal_flush(journal);
1978 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
1979 sb->s_flags & MS_RDONLY) {
1980 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1981 sb->s_dirt = 0;
1982 ext3_commit_super(sb, es, 1);
1983 }
1984 journal_unlock_updates(journal);
1985}
1986
1987/*
1988 * If we are mounting (or read-write remounting) a filesystem whose journal
1989 * has recorded an error from a previous lifetime, move that error to the
1990 * main filesystem now.
1991 */
1992static void ext3_clear_journal_err(struct super_block * sb,
1993 struct ext3_super_block * es)
1994{
1995 journal_t *journal;
1996 int j_errno;
1997 const char *errstr;
1998
1999 journal = EXT3_SB(sb)->s_journal;
2000
2001 /*
2002 * Now check for any error status which may have been recorded in the
2003 * journal by a prior ext3_error() or ext3_abort()
2004 */
2005
2006 j_errno = journal_errno(journal);
2007 if (j_errno) {
2008 char nbuf[16];
2009
2010 errstr = ext3_decode_error(sb, j_errno, nbuf);
2011 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2012 "from previous mount: %s", errstr);
2013 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2014 "filesystem check.");
2015
2016 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2017 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2018 ext3_commit_super (sb, es, 1);
2019
2020 journal_clear_err(journal);
2021 }
2022}
2023
2024/*
2025 * Force the running and committing transactions to commit,
2026 * and wait on the commit.
2027 */
2028int ext3_force_commit(struct super_block *sb)
2029{
2030 journal_t *journal;
2031 int ret;
2032
2033 if (sb->s_flags & MS_RDONLY)
2034 return 0;
2035
2036 journal = EXT3_SB(sb)->s_journal;
2037 sb->s_dirt = 0;
2038 ret = ext3_journal_force_commit(journal);
2039 return ret;
2040}
2041
2042/*
2043 * Ext3 always journals updates to the superblock itself, so we don't
2044 * have to propagate any other updates to the superblock on disk at this
2045 * point. Just start an async writeback to get the buffers on their way
2046 * to the disk.
2047 *
2048 * This implicitly triggers the writebehind on sync().
2049 */
2050
2051static void ext3_write_super (struct super_block * sb)
2052{
2053 if (down_trylock(&sb->s_lock) == 0)
2054 BUG();
2055 sb->s_dirt = 0;
2056}
2057
2058static int ext3_sync_fs(struct super_block *sb, int wait)
2059{
2060 tid_t target;
2061
2062 sb->s_dirt = 0;
2063 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2064 if (wait)
2065 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2066 }
2067 return 0;
2068}
2069
2070/*
2071 * LVM calls this function before a (read-only) snapshot is created. This
2072 * gives us a chance to flush the journal completely and mark the fs clean.
2073 */
2074static void ext3_write_super_lockfs(struct super_block *sb)
2075{
2076 sb->s_dirt = 0;
2077
2078 if (!(sb->s_flags & MS_RDONLY)) {
2079 journal_t *journal = EXT3_SB(sb)->s_journal;
2080
2081 /* Now we set up the journal barrier. */
2082 journal_lock_updates(journal);
2083 journal_flush(journal);
2084
2085 /* Journal blocked and flushed, clear needs_recovery flag. */
2086 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2087 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2088 }
2089}
2090
2091/*
2092 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2093 * flag here, even though the filesystem is not technically dirty yet.
2094 */
2095static void ext3_unlockfs(struct super_block *sb)
2096{
2097 if (!(sb->s_flags & MS_RDONLY)) {
2098 lock_super(sb);
2099 /* Reser the needs_recovery flag before the fs is unlocked. */
2100 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2101 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2102 unlock_super(sb);
2103 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2104 }
2105}
2106
2107static int ext3_remount (struct super_block * sb, int * flags, char * data)
2108{
2109 struct ext3_super_block * es;
2110 struct ext3_sb_info *sbi = EXT3_SB(sb);
2111 unsigned long tmp;
2112 unsigned long n_blocks_count = 0;
2113
2114 /*
2115 * Allow the "check" option to be passed as a remount option.
2116 */
2117 if (!parse_options(data, sb, &tmp, &n_blocks_count, 1))
2118 return -EINVAL;
2119
2120 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2121 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2122
2123 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2124 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2125
2126 es = sbi->s_es;
2127
2128 ext3_init_journal_params(sb, sbi->s_journal);
2129
2130 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2131 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2132 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2133 return -EROFS;
2134
2135 if (*flags & MS_RDONLY) {
2136 /*
2137 * First of all, the unconditional stuff we have to do
2138 * to disable replay of the journal when we next remount
2139 */
2140 sb->s_flags |= MS_RDONLY;
2141
2142 /*
2143 * OK, test if we are remounting a valid rw partition
2144 * readonly, and if so set the rdonly flag and then
2145 * mark the partition as valid again.
2146 */
2147 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2148 (sbi->s_mount_state & EXT3_VALID_FS))
2149 es->s_state = cpu_to_le16(sbi->s_mount_state);
2150
2151 ext3_mark_recovery_complete(sb, es);
2152 } else {
2153 __le32 ret;
2154 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2155 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2156 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2157 "remount RDWR because of unsupported "
2158 "optional features (%x).\n",
2159 sb->s_id, le32_to_cpu(ret));
2160 return -EROFS;
2161 }
2162 /*
2163 * Mounting a RDONLY partition read-write, so reread
2164 * and store the current valid flag. (It may have
2165 * been changed by e2fsck since we originally mounted
2166 * the partition.)
2167 */
2168 ext3_clear_journal_err(sb, es);
2169 sbi->s_mount_state = le16_to_cpu(es->s_state);
2170 if ((ret = ext3_group_extend(sb, es, n_blocks_count)))
2171 return ret;
2172 if (!ext3_setup_super (sb, es, 0))
2173 sb->s_flags &= ~MS_RDONLY;
2174 }
2175 }
2176 return 0;
2177}
2178
2179static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2180{
2181 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2182 unsigned long overhead;
2183 int i;
2184
2185 if (test_opt (sb, MINIX_DF))
2186 overhead = 0;
2187 else {
2188 unsigned long ngroups;
2189 ngroups = EXT3_SB(sb)->s_groups_count;
2190 smp_rmb();
2191
2192 /*
2193 * Compute the overhead (FS structures)
2194 */
2195
2196 /*
2197 * All of the blocks before first_data_block are
2198 * overhead
2199 */
2200 overhead = le32_to_cpu(es->s_first_data_block);
2201
2202 /*
2203 * Add the overhead attributed to the superblock and
2204 * block group descriptors. If the sparse superblocks
2205 * feature is turned on, then not all groups have this.
2206 */
2207 for (i = 0; i < ngroups; i++) {
2208 overhead += ext3_bg_has_super(sb, i) +
2209 ext3_bg_num_gdb(sb, i);
2210 cond_resched();
2211 }
2212
2213 /*
2214 * Every block group has an inode bitmap, a block
2215 * bitmap, and an inode table.
2216 */
2217 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2218 }
2219
2220 buf->f_type = EXT3_SUPER_MAGIC;
2221 buf->f_bsize = sb->s_blocksize;
2222 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2223 buf->f_bfree = ext3_count_free_blocks (sb);
2224 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2225 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2226 buf->f_bavail = 0;
2227 buf->f_files = le32_to_cpu(es->s_inodes_count);
2228 buf->f_ffree = ext3_count_free_inodes (sb);
2229 buf->f_namelen = EXT3_NAME_LEN;
2230 return 0;
2231}
2232
2233/* Helper function for writing quotas on sync - we need to start transaction before quota file
2234 * is locked for write. Otherwise the are possible deadlocks:
2235 * Process 1 Process 2
2236 * ext3_create() quota_sync()
2237 * journal_start() write_dquot()
2238 * DQUOT_INIT() down(dqio_sem)
2239 * down(dqio_sem) journal_start()
2240 *
2241 */
2242
2243#ifdef CONFIG_QUOTA
2244
2245static inline struct inode *dquot_to_inode(struct dquot *dquot)
2246{
2247 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2248}
2249
2250static int ext3_dquot_initialize(struct inode *inode, int type)
2251{
2252 handle_t *handle;
2253 int ret, err;
2254
2255 /* We may create quota structure so we need to reserve enough blocks */
1f54587b 2256 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
1da177e4
LT		 2257 if (IS_ERR(handle))
2258 return PTR_ERR(handle);
2259 ret = dquot_initialize(inode, type);
2260 err = ext3_journal_stop(handle);
2261 if (!ret)
2262 ret = err;
2263 return ret;
2264}
2265
2266static int ext3_dquot_drop(struct inode *inode)
2267{
2268 handle_t *handle;
2269 int ret, err;
2270
2271 /* We may delete quota structure so we need to reserve enough blocks */
1f54587b 2272 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
1da177e4
LT		 2273 if (IS_ERR(handle))
2274 return PTR_ERR(handle);
2275 ret = dquot_drop(inode);
2276 err = ext3_journal_stop(handle);
2277 if (!ret)
2278 ret = err;
2279 return ret;
2280}
2281
2282static int ext3_write_dquot(struct dquot *dquot)
2283{
2284 int ret, err;
2285 handle_t *handle;
2286 struct inode *inode;
2287
2288 inode = dquot_to_inode(dquot);
2289 handle = ext3_journal_start(inode,
1f54587b 2290 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2291 if (IS_ERR(handle))
2292 return PTR_ERR(handle);
2293 ret = dquot_commit(dquot);
2294 err = ext3_journal_stop(handle);
2295 if (!ret)
2296 ret = err;
2297 return ret;
2298}
2299
2300static int ext3_acquire_dquot(struct dquot *dquot)
2301{
2302 int ret, err;
2303 handle_t *handle;
2304
2305 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2306 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2307 if (IS_ERR(handle))
2308 return PTR_ERR(handle);
2309 ret = dquot_acquire(dquot);
2310 err = ext3_journal_stop(handle);
2311 if (!ret)
2312 ret = err;
2313 return ret;
2314}
2315
2316static int ext3_release_dquot(struct dquot *dquot)
2317{
2318 int ret, err;
2319 handle_t *handle;
2320
2321 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2322 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2323 if (IS_ERR(handle))
2324 return PTR_ERR(handle);
2325 ret = dquot_release(dquot);
2326 err = ext3_journal_stop(handle);
2327 if (!ret)
2328 ret = err;
2329 return ret;
2330}
2331
2332static int ext3_mark_dquot_dirty(struct dquot *dquot)
2333{
2334 /* Are we journalling quotas? */
2335 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2336 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2337 dquot_mark_dquot_dirty(dquot);
2338 return ext3_write_dquot(dquot);
2339 } else {
2340 return dquot_mark_dquot_dirty(dquot);
2341 }
2342}
2343
2344static int ext3_write_info(struct super_block *sb, int type)
2345{
2346 int ret, err;
2347 handle_t *handle;
2348
2349 /* Data block + inode block */
2350 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2351 if (IS_ERR(handle))
2352 return PTR_ERR(handle);
2353 ret = dquot_commit_info(sb, type);
2354 err = ext3_journal_stop(handle);
2355 if (!ret)
2356 ret = err;
2357 return ret;
2358}
2359
2360/*
2361 * Turn on quotas during mount time - we need to find
2362 * the quota file and such...
2363 */
2364static int ext3_quota_on_mount(struct super_block *sb, int type)
2365{
84de856e
CH		 2366 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2367 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2368}
2369
2370/*
2371 * Standard function to be called on quota_on
2372 */
2373static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2374 char *path)
2375{
2376 int err;
2377 struct nameidata nd;
2378
1f54587b
JK		 2379 if (!test_opt(sb, QUOTA))
2380 return -EINVAL;
1da177e4
LT		 2381 /* Not journalling quota? */
2382 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2383 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2384 return vfs_quota_on(sb, type, format_id, path);
2385 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2386 if (err)
2387 return err;
2388 /* Quotafile not on the same filesystem? */
2389 if (nd.mnt->mnt_sb != sb) {
2390 path_release(&nd);
2391 return -EXDEV;
2392 }
2393 /* Quotafile not of fs root? */
2394 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2395 printk(KERN_WARNING
2396 "EXT3-fs: Quota file not on filesystem root. "
2397 "Journalled quota will not work.\n");
2398 path_release(&nd);
2399 return vfs_quota_on(sb, type, format_id, path);
2400}
2401
2402/* Read data from quotafile - avoid pagecache and such because we cannot afford
2403 * acquiring the locks... As quota files are never truncated and quota code
2404 * itself serializes the operations (and noone else should touch the files)
2405 * we don't have to be afraid of races */
2406static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2407 size_t len, loff_t off)
2408{
2409 struct inode *inode = sb_dqopt(sb)->files[type];
2410 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2411 int err = 0;
2412 int offset = off & (sb->s_blocksize - 1);
2413 int tocopy;
2414 size_t toread;
2415 struct buffer_head *bh;
2416 loff_t i_size = i_size_read(inode);
2417
2418 if (off > i_size)
2419 return 0;
2420 if (off+len > i_size)
2421 len = i_size-off;
2422 toread = len;
2423 while (toread > 0) {
2424 tocopy = sb->s_blocksize - offset < toread ?
2425 sb->s_blocksize - offset : toread;
2426 bh = ext3_bread(NULL, inode, blk, 0, &err);
2427 if (err)
2428 return err;
2429 if (!bh) /* A hole? */
2430 memset(data, 0, tocopy);
2431 else
2432 memcpy(data, bh->b_data+offset, tocopy);
2433 brelse(bh);
2434 offset = 0;
2435 toread -= tocopy;
2436 data += tocopy;
2437 blk++;
2438 }
2439 return len;
2440}
2441
2442/* Write to quotafile (we know the transaction is already started and has
2443 * enough credits) */
2444static ssize_t ext3_quota_write(struct super_block *sb, int type,
2445 const char *data, size_t len, loff_t off)
2446{
2447 struct inode *inode = sb_dqopt(sb)->files[type];
2448 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2449 int err = 0;
2450 int offset = off & (sb->s_blocksize - 1);
2451 int tocopy;
2452 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2453 size_t towrite = len;
2454 struct buffer_head *bh;
2455 handle_t *handle = journal_current_handle();
2456
2457 down(&inode->i_sem);
2458 while (towrite > 0) {
2459 tocopy = sb->s_blocksize - offset < towrite ?
2460 sb->s_blocksize - offset : towrite;
2461 bh = ext3_bread(handle, inode, blk, 1, &err);
2462 if (!bh)
2463 goto out;
2464 if (journal_quota) {
2465 err = ext3_journal_get_write_access(handle, bh);
2466 if (err) {
2467 brelse(bh);
2468 goto out;
2469 }
2470 }
2471 lock_buffer(bh);
2472 memcpy(bh->b_data+offset, data, tocopy);
2473 flush_dcache_page(bh->b_page);
2474 unlock_buffer(bh);
2475 if (journal_quota)
2476 err = ext3_journal_dirty_metadata(handle, bh);
2477 else {
2478 /* Always do at least ordered writes for quotas */
2479 err = ext3_journal_dirty_data(handle, bh);
2480 mark_buffer_dirty(bh);
2481 }
2482 brelse(bh);
2483 if (err)
2484 goto out;
2485 offset = 0;
2486 towrite -= tocopy;
2487 data += tocopy;
2488 blk++;
2489 }
2490out:
2491 if (len == towrite)
2492 return err;
2493 if (inode->i_size < off+len-towrite) {
2494 i_size_write(inode, off+len-towrite);
2495 EXT3_I(inode)->i_disksize = inode->i_size;
2496 }
2497 inode->i_version++;
2498 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2499 ext3_mark_inode_dirty(handle, inode);
2500 up(&inode->i_sem);
2501 return len - towrite;
2502}
2503
2504#endif
2505
2506static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2507 int flags, const char *dev_name, void *data)
2508{
2509 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2510}
2511
2512static struct file_system_type ext3_fs_type = {
2513 .owner = THIS_MODULE,
2514 .name = "ext3",
2515 .get_sb = ext3_get_sb,
2516 .kill_sb = kill_block_super,
2517 .fs_flags = FS_REQUIRES_DEV,
2518};
2519
2520static int __init init_ext3_fs(void)
2521{
2522 int err = init_ext3_xattr();
2523 if (err)
2524 return err;
2525 err = init_inodecache();
2526 if (err)
2527 goto out1;
2528 err = register_filesystem(&ext3_fs_type);
2529 if (err)
2530 goto out;
2531 return 0;
2532out:
2533 destroy_inodecache();
2534out1:
2535 exit_ext3_xattr();
2536 return err;
2537}
2538
2539static void __exit exit_ext3_fs(void)
2540{
2541 unregister_filesystem(&ext3_fs_type);
2542 destroy_inodecache();
2543 exit_ext3_xattr();
2544}
2545
2546MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2547MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2548MODULE_LICENSE("GPL");
2549module_init(init_ext3_fs)
2550module_exit(exit_ext3_fs)
Clone of davem's net-next-2.6 tree