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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];
228 const char *errstr = ext3_decode_error(sb, errno, nbuf);
229
230 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
231 sb->s_id, function, errstr);
232
233 ext3_handle_error(sb);
234}
235
236/*
237 * ext3_abort is a much stronger failure handler than ext3_error. The
238 * abort function may be used to deal with unrecoverable failures such
239 * as journal IO errors or ENOMEM at a critical moment in log management.
240 *
241 * We unconditionally force the filesystem into an ABORT|READONLY state,
242 * unless the error response on the fs has been set to panic in which
243 * case we take the easy way out and panic immediately.
244 */
245
246void ext3_abort (struct super_block * sb, const char * function,
247 const char * fmt, ...)
248{
249 va_list args;
250
251 printk (KERN_CRIT "ext3_abort called.\n");
252
253 va_start(args, fmt);
254 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
255 vprintk(fmt, args);
256 printk("\n");
257 va_end(args);
258
259 if (test_opt(sb, ERRORS_PANIC))
260 panic("EXT3-fs panic from previous error\n");
261
262 if (sb->s_flags & MS_RDONLY)
263 return;
264
265 printk(KERN_CRIT "Remounting filesystem read-only\n");
266 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
267 sb->s_flags |= MS_RDONLY;
268 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
269 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
270}
271
272void ext3_warning (struct super_block * sb, const char * function,
273 const char * fmt, ...)
274{
275 va_list args;
276
277 va_start(args, fmt);
278 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
279 sb->s_id, function);
280 vprintk(fmt, args);
281 printk("\n");
282 va_end(args);
283}
284
285void ext3_update_dynamic_rev(struct super_block *sb)
286{
287 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
288
289 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
290 return;
291
292 ext3_warning(sb, __FUNCTION__,
293 "updating to rev %d because of new feature flag, "
294 "running e2fsck is recommended",
295 EXT3_DYNAMIC_REV);
296
297 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
298 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
299 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
300 /* leave es->s_feature_*compat flags alone */
301 /* es->s_uuid will be set by e2fsck if empty */
302
303 /*
304 * The rest of the superblock fields should be zero, and if not it
305 * means they are likely already in use, so leave them alone. We
306 * can leave it up to e2fsck to clean up any inconsistencies there.
307 */
308}
309
310/*
311 * Open the external journal device
312 */
313static struct block_device *ext3_blkdev_get(dev_t dev)
314{
315 struct block_device *bdev;
316 char b[BDEVNAME_SIZE];
317
318 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
319 if (IS_ERR(bdev))
320 goto fail;
321 return bdev;
322
323fail:
324 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
325 __bdevname(dev, b), PTR_ERR(bdev));
326 return NULL;
327}
328
329/*
330 * Release the journal device
331 */
332static int ext3_blkdev_put(struct block_device *bdev)
333{
334 bd_release(bdev);
335 return blkdev_put(bdev);
336}
337
338static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
339{
340 struct block_device *bdev;
341 int ret = -ENODEV;
342
343 bdev = sbi->journal_bdev;
344 if (bdev) {
345 ret = ext3_blkdev_put(bdev);
346 sbi->journal_bdev = NULL;
347 }
348 return ret;
349}
350
351static inline struct inode *orphan_list_entry(struct list_head *l)
352{
353 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
354}
355
356static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
357{
358 struct list_head *l;
359
360 printk(KERN_ERR "sb orphan head is %d\n",
361 le32_to_cpu(sbi->s_es->s_last_orphan));
362
363 printk(KERN_ERR "sb_info orphan list:\n");
364 list_for_each(l, &sbi->s_orphan) {
365 struct inode *inode = orphan_list_entry(l);
366 printk(KERN_ERR " "
367 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
368 inode->i_sb->s_id, inode->i_ino, inode,
369 inode->i_mode, inode->i_nlink,
370 NEXT_ORPHAN(inode));
371 }
372}
373
374static void ext3_put_super (struct super_block * sb)
375{
376 struct ext3_sb_info *sbi = EXT3_SB(sb);
377 struct ext3_super_block *es = sbi->s_es;
378 int i;
379
380 ext3_xattr_put_super(sb);
381 journal_destroy(sbi->s_journal);
382 if (!(sb->s_flags & MS_RDONLY)) {
383 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
384 es->s_state = cpu_to_le16(sbi->s_mount_state);
385 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
386 mark_buffer_dirty(sbi->s_sbh);
387 ext3_commit_super(sb, es, 1);
388 }
389
390 for (i = 0; i < sbi->s_gdb_count; i++)
391 brelse(sbi->s_group_desc[i]);
392 kfree(sbi->s_group_desc);
393 percpu_counter_destroy(&sbi->s_freeblocks_counter);
394 percpu_counter_destroy(&sbi->s_freeinodes_counter);
395 percpu_counter_destroy(&sbi->s_dirs_counter);
396 brelse(sbi->s_sbh);
397#ifdef CONFIG_QUOTA
398 for (i = 0; i < MAXQUOTAS; i++)
399 kfree(sbi->s_qf_names[i]);
400#endif
401
402 /* Debugging code just in case the in-memory inode orphan list
403 * isn't empty. The on-disk one can be non-empty if we've
404 * detected an error and taken the fs readonly, but the
405 * in-memory list had better be clean by this point. */
406 if (!list_empty(&sbi->s_orphan))
407 dump_orphan_list(sb, sbi);
408 J_ASSERT(list_empty(&sbi->s_orphan));
409
410 invalidate_bdev(sb->s_bdev, 0);
411 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
412 /*
413 * Invalidate the journal device's buffers. We don't want them
414 * floating about in memory - the physical journal device may
415 * hotswapped, and it breaks the `ro-after' testing code.
416 */
417 sync_blockdev(sbi->journal_bdev);
418 invalidate_bdev(sbi->journal_bdev, 0);
419 ext3_blkdev_remove(sbi);
420 }
421 sb->s_fs_info = NULL;
422 kfree(sbi);
423 return;
424}
425
426static kmem_cache_t *ext3_inode_cachep;
427
428/*
429 * Called inside transaction, so use GFP_NOFS
430 */
431static struct inode *ext3_alloc_inode(struct super_block *sb)
432{
433 struct ext3_inode_info *ei;
434
435 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
436 if (!ei)
437 return NULL;
438#ifdef CONFIG_EXT3_FS_POSIX_ACL
439 ei->i_acl = EXT3_ACL_NOT_CACHED;
440 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
441#endif
442 ei->i_block_alloc_info = NULL;
443 ei->vfs_inode.i_version = 1;
444 return &ei->vfs_inode;
445}
446
447static void ext3_destroy_inode(struct inode *inode)
448{
449 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
450}
451
452static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
453{
454 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
455
456 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
457 SLAB_CTOR_CONSTRUCTOR) {
458 INIT_LIST_HEAD(&ei->i_orphan);
459#ifdef CONFIG_EXT3_FS_XATTR
460 init_rwsem(&ei->xattr_sem);
461#endif
462 init_MUTEX(&ei->truncate_sem);
463 inode_init_once(&ei->vfs_inode);
464 }
465}
466
467static int init_inodecache(void)
468{
469 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
470 sizeof(struct ext3_inode_info),
471 0, SLAB_RECLAIM_ACCOUNT,
472 init_once, NULL);
473 if (ext3_inode_cachep == NULL)
474 return -ENOMEM;
475 return 0;
476}
477
478static void destroy_inodecache(void)
479{
480 if (kmem_cache_destroy(ext3_inode_cachep))
481 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
482}
483
484static void ext3_clear_inode(struct inode *inode)
485{
486 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
487#ifdef CONFIG_EXT3_FS_POSIX_ACL
488 if (EXT3_I(inode)->i_acl &&
489 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
490 posix_acl_release(EXT3_I(inode)->i_acl);
491 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
492 }
493 if (EXT3_I(inode)->i_default_acl &&
494 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
495 posix_acl_release(EXT3_I(inode)->i_default_acl);
496 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
497 }
498#endif
499 ext3_discard_reservation(inode);
500 EXT3_I(inode)->i_block_alloc_info = NULL;
501 kfree(rsv);
502}
503
504#ifdef CONFIG_QUOTA
505
506#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
507#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
508
509static int ext3_dquot_initialize(struct inode *inode, int type);
510static int ext3_dquot_drop(struct inode *inode);
511static int ext3_write_dquot(struct dquot *dquot);
512static int ext3_acquire_dquot(struct dquot *dquot);
513static int ext3_release_dquot(struct dquot *dquot);
514static int ext3_mark_dquot_dirty(struct dquot *dquot);
515static int ext3_write_info(struct super_block *sb, int type);
516static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
517static int ext3_quota_on_mount(struct super_block *sb, int type);
518static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
519 size_t len, loff_t off);
520static ssize_t ext3_quota_write(struct super_block *sb, int type,
521 const char *data, size_t len, loff_t off);
522
523static struct dquot_operations ext3_quota_operations = {
524 .initialize = ext3_dquot_initialize,
525 .drop = ext3_dquot_drop,
526 .alloc_space = dquot_alloc_space,
527 .alloc_inode = dquot_alloc_inode,
528 .free_space = dquot_free_space,
529 .free_inode = dquot_free_inode,
530 .transfer = dquot_transfer,
531 .write_dquot = ext3_write_dquot,
532 .acquire_dquot = ext3_acquire_dquot,
533 .release_dquot = ext3_release_dquot,
534 .mark_dirty = ext3_mark_dquot_dirty,
535 .write_info = ext3_write_info
536};
537
538static struct quotactl_ops ext3_qctl_operations = {
539 .quota_on = ext3_quota_on,
540 .quota_off = vfs_quota_off,
541 .quota_sync = vfs_quota_sync,
542 .get_info = vfs_get_dqinfo,
543 .set_info = vfs_set_dqinfo,
544 .get_dqblk = vfs_get_dqblk,
545 .set_dqblk = vfs_set_dqblk
546};
547#endif
548
549static struct super_operations ext3_sops = {
550 .alloc_inode = ext3_alloc_inode,
551 .destroy_inode = ext3_destroy_inode,
552 .read_inode = ext3_read_inode,
553 .write_inode = ext3_write_inode,
554 .dirty_inode = ext3_dirty_inode,
555 .delete_inode = ext3_delete_inode,
556 .put_super = ext3_put_super,
557 .write_super = ext3_write_super,
558 .sync_fs = ext3_sync_fs,
559 .write_super_lockfs = ext3_write_super_lockfs,
560 .unlockfs = ext3_unlockfs,
561 .statfs = ext3_statfs,
562 .remount_fs = ext3_remount,
563 .clear_inode = ext3_clear_inode,
564#ifdef CONFIG_QUOTA
565 .quota_read = ext3_quota_read,
566 .quota_write = ext3_quota_write,
567#endif
568};
569
570struct dentry *ext3_get_parent(struct dentry *child);
571static struct export_operations ext3_export_ops = {
572 .get_parent = ext3_get_parent,
573};
574
575enum {
576 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
577 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
578 Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
579 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
580 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
581 Opt_commit, Opt_journal_update, Opt_journal_inum,
582 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
583 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
584 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0,
585 Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
586};
587
588static match_table_t tokens = {
589 {Opt_bsd_df, "bsddf"},
590 {Opt_minix_df, "minixdf"},
591 {Opt_grpid, "grpid"},
592 {Opt_grpid, "bsdgroups"},
593 {Opt_nogrpid, "nogrpid"},
594 {Opt_nogrpid, "sysvgroups"},
595 {Opt_resgid, "resgid=%u"},
596 {Opt_resuid, "resuid=%u"},
597 {Opt_sb, "sb=%u"},
598 {Opt_err_cont, "errors=continue"},
599 {Opt_err_panic, "errors=panic"},
600 {Opt_err_ro, "errors=remount-ro"},
601 {Opt_nouid32, "nouid32"},
602 {Opt_nocheck, "nocheck"},
603 {Opt_nocheck, "check=none"},
604 {Opt_check, "check"},
605 {Opt_debug, "debug"},
606 {Opt_oldalloc, "oldalloc"},
607 {Opt_orlov, "orlov"},
608 {Opt_user_xattr, "user_xattr"},
609 {Opt_nouser_xattr, "nouser_xattr"},
610 {Opt_acl, "acl"},
611 {Opt_noacl, "noacl"},
612 {Opt_reservation, "reservation"},
613 {Opt_noreservation, "noreservation"},
614 {Opt_noload, "noload"},
615 {Opt_nobh, "nobh"},
616 {Opt_commit, "commit=%u"},
617 {Opt_journal_update, "journal=update"},
618 {Opt_journal_inum, "journal=%u"},
619 {Opt_abort, "abort"},
620 {Opt_data_journal, "data=journal"},
621 {Opt_data_ordered, "data=ordered"},
622 {Opt_data_writeback, "data=writeback"},
623 {Opt_offusrjquota, "usrjquota="},
624 {Opt_usrjquota, "usrjquota=%s"},
625 {Opt_offgrpjquota, "grpjquota="},
626 {Opt_grpjquota, "grpjquota=%s"},
627 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
628 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
629 {Opt_ignore, "grpquota"},
630 {Opt_ignore, "noquota"},
631 {Opt_ignore, "quota"},
632 {Opt_ignore, "usrquota"},
633 {Opt_barrier, "barrier=%u"},
634 {Opt_err, NULL},
635 {Opt_resize, "resize"},
636};
637
638static unsigned long get_sb_block(void **data)
639{
640 unsigned long sb_block;
641 char *options = (char *) *data;
642
643 if (!options || strncmp(options, "sb=", 3) != 0)
644 return 1; /* Default location */
645 options += 3;
646 sb_block = simple_strtoul(options, &options, 0);
647 if (*options && *options != ',') {
648 printk("EXT3-fs: Invalid sb specification: %s\n",
649 (char *) *data);
650 return 1;
651 }
652 if (*options == ',')
653 options++;
654 *data = (void *) options;
655 return sb_block;
656}
657
658static int parse_options (char * options, struct super_block *sb,
659 unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
660{
661 struct ext3_sb_info *sbi = EXT3_SB(sb);
662 char * p;
663 substring_t args[MAX_OPT_ARGS];
664 int data_opt = 0;
665 int option;
666#ifdef CONFIG_QUOTA
667 int qtype;
668 char *qname;
669#endif
670
671 if (!options)
672 return 1;
673
674 while ((p = strsep (&options, ",")) != NULL) {
675 int token;
676 if (!*p)
677 continue;
678
679 token = match_token(p, tokens, args);
680 switch (token) {
681 case Opt_bsd_df:
682 clear_opt (sbi->s_mount_opt, MINIX_DF);
683 break;
684 case Opt_minix_df:
685 set_opt (sbi->s_mount_opt, MINIX_DF);
686 break;
687 case Opt_grpid:
688 set_opt (sbi->s_mount_opt, GRPID);
689 break;
690 case Opt_nogrpid:
691 clear_opt (sbi->s_mount_opt, GRPID);
692 break;
693 case Opt_resuid:
694 if (match_int(&args[0], &option))
695 return 0;
696 sbi->s_resuid = option;
697 break;
698 case Opt_resgid:
699 if (match_int(&args[0], &option))
700 return 0;
701 sbi->s_resgid = option;
702 break;
703 case Opt_sb:
704 /* handled by get_sb_block() instead of here */
705 /* *sb_block = match_int(&args[0]); */
706 break;
707 case Opt_err_panic:
708 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
709 clear_opt (sbi->s_mount_opt, ERRORS_RO);
710 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
711 break;
712 case Opt_err_ro:
713 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
714 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
715 set_opt (sbi->s_mount_opt, ERRORS_RO);
716 break;
717 case Opt_err_cont:
718 clear_opt (sbi->s_mount_opt, ERRORS_RO);
719 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
720 set_opt (sbi->s_mount_opt, ERRORS_CONT);
721 break;
722 case Opt_nouid32:
723 set_opt (sbi->s_mount_opt, NO_UID32);
724 break;
725 case Opt_check:
726#ifdef CONFIG_EXT3_CHECK
727 set_opt (sbi->s_mount_opt, CHECK);
728#else
729 printk(KERN_ERR
730 "EXT3 Check option not supported\n");
731#endif
732 break;
733 case Opt_nocheck:
734 clear_opt (sbi->s_mount_opt, CHECK);
735 break;
736 case Opt_debug:
737 set_opt (sbi->s_mount_opt, DEBUG);
738 break;
739 case Opt_oldalloc:
740 set_opt (sbi->s_mount_opt, OLDALLOC);
741 break;
742 case Opt_orlov:
743 clear_opt (sbi->s_mount_opt, OLDALLOC);
744 break;
745#ifdef CONFIG_EXT3_FS_XATTR
746 case Opt_user_xattr:
747 set_opt (sbi->s_mount_opt, XATTR_USER);
748 break;
749 case Opt_nouser_xattr:
750 clear_opt (sbi->s_mount_opt, XATTR_USER);
751 break;
752#else
753 case Opt_user_xattr:
754 case Opt_nouser_xattr:
755 printk("EXT3 (no)user_xattr options not supported\n");
756 break;
757#endif
758#ifdef CONFIG_EXT3_FS_POSIX_ACL
759 case Opt_acl:
760 set_opt(sbi->s_mount_opt, POSIX_ACL);
761 break;
762 case Opt_noacl:
763 clear_opt(sbi->s_mount_opt, POSIX_ACL);
764 break;
765#else
766 case Opt_acl:
767 case Opt_noacl:
768 printk("EXT3 (no)acl options not supported\n");
769 break;
770#endif
771 case Opt_reservation:
772 set_opt(sbi->s_mount_opt, RESERVATION);
773 break;
774 case Opt_noreservation:
775 clear_opt(sbi->s_mount_opt, RESERVATION);
776 break;
777 case Opt_journal_update:
778 /* @@@ FIXME */
779 /* Eventually we will want to be able to create
780 a journal file here. For now, only allow the
781 user to specify an existing inode to be the
782 journal file. */
783 if (is_remount) {
784 printk(KERN_ERR "EXT3-fs: cannot specify "
785 "journal on remount\n");
786 return 0;
787 }
788 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
789 break;
790 case Opt_journal_inum:
791 if (is_remount) {
792 printk(KERN_ERR "EXT3-fs: cannot specify "
793 "journal on remount\n");
794 return 0;
795 }
796 if (match_int(&args[0], &option))
797 return 0;
798 *inum = option;
799 break;
800 case Opt_noload:
801 set_opt (sbi->s_mount_opt, NOLOAD);
802 break;
803 case Opt_commit:
804 if (match_int(&args[0], &option))
805 return 0;
806 if (option < 0)
807 return 0;
808 if (option == 0)
809 option = JBD_DEFAULT_MAX_COMMIT_AGE;
810 sbi->s_commit_interval = HZ * option;
811 break;
812 case Opt_data_journal:
813 data_opt = EXT3_MOUNT_JOURNAL_DATA;
814 goto datacheck;
815 case Opt_data_ordered:
816 data_opt = EXT3_MOUNT_ORDERED_DATA;
817 goto datacheck;
818 case Opt_data_writeback:
819 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
820 datacheck:
821 if (is_remount) {
822 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
823 != data_opt) {
824 printk(KERN_ERR
825 "EXT3-fs: cannot change data "
826 "mode on remount\n");
827 return 0;
828 }
829 } else {
830 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
831 sbi->s_mount_opt |= data_opt;
832 }
833 break;
834#ifdef CONFIG_QUOTA
835 case Opt_usrjquota:
836 qtype = USRQUOTA;
837 goto set_qf_name;
838 case Opt_grpjquota:
839 qtype = GRPQUOTA;
840set_qf_name:
841 if (sb_any_quota_enabled(sb)) {
842 printk(KERN_ERR
843 "EXT3-fs: Cannot change journalled "
844 "quota options when quota turned on.\n");
845 return 0;
846 }
847 qname = match_strdup(&args[0]);
848 if (!qname) {
849 printk(KERN_ERR
850 "EXT3-fs: not enough memory for "
851 "storing quotafile name.\n");
852 return 0;
853 }
854 if (sbi->s_qf_names[qtype] &&
855 strcmp(sbi->s_qf_names[qtype], qname)) {
856 printk(KERN_ERR
857 "EXT3-fs: %s quota file already "
858 "specified.\n", QTYPE2NAME(qtype));
859 kfree(qname);
860 return 0;
861 }
862 sbi->s_qf_names[qtype] = qname;
863 if (strchr(sbi->s_qf_names[qtype], '/')) {
864 printk(KERN_ERR
865 "EXT3-fs: quotafile must be on "
866 "filesystem root.\n");
867 kfree(sbi->s_qf_names[qtype]);
868 sbi->s_qf_names[qtype] = NULL;
869 return 0;
870 }
871 break;
872 case Opt_offusrjquota:
873 qtype = USRQUOTA;
874 goto clear_qf_name;
875 case Opt_offgrpjquota:
876 qtype = GRPQUOTA;
877clear_qf_name:
878 if (sb_any_quota_enabled(sb)) {
879 printk(KERN_ERR "EXT3-fs: Cannot change "
880 "journalled quota options when "
881 "quota turned on.\n");
882 return 0;
883 }
884 kfree(sbi->s_qf_names[qtype]);
885 sbi->s_qf_names[qtype] = NULL;
886 break;
887 case Opt_jqfmt_vfsold:
888 sbi->s_jquota_fmt = QFMT_VFS_OLD;
889 break;
890 case Opt_jqfmt_vfsv0:
891 sbi->s_jquota_fmt = QFMT_VFS_V0;
892 break;
893#else
894 case Opt_usrjquota:
895 case Opt_grpjquota:
896 case Opt_offusrjquota:
897 case Opt_offgrpjquota:
898 case Opt_jqfmt_vfsold:
899 case Opt_jqfmt_vfsv0:
900 printk(KERN_ERR
901 "EXT3-fs: journalled quota options not "
902 "supported.\n");
903 break;
904#endif
905 case Opt_abort:
906 set_opt(sbi->s_mount_opt, ABORT);
907 break;
908 case Opt_barrier:
909 if (match_int(&args[0], &option))
910 return 0;
911 if (option)
912 set_opt(sbi->s_mount_opt, BARRIER);
913 else
914 clear_opt(sbi->s_mount_opt, BARRIER);
915 break;
916 case Opt_ignore:
917 break;
918 case Opt_resize:
919 if (!n_blocks_count) {
920 printk("EXT3-fs: resize option only available "
921 "for remount\n");
922 return 0;
923 }
924 match_int(&args[0], &option);
925 *n_blocks_count = option;
926 break;
927 case Opt_nobh:
928 set_opt(sbi->s_mount_opt, NOBH);
929 break;
930 default:
931 printk (KERN_ERR
932 "EXT3-fs: Unrecognized mount option \"%s\" "
933 "or missing value\n", p);
934 return 0;
935 }
936 }
937#ifdef CONFIG_QUOTA
938 if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] ||
939 sbi->s_qf_names[GRPQUOTA])) {
940 printk(KERN_ERR
941 "EXT3-fs: journalled quota format not specified.\n");
942 return 0;
943 }
944#endif
945
946 return 1;
947}
948
949static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
950 int read_only)
951{
952 struct ext3_sb_info *sbi = EXT3_SB(sb);
953 int res = 0;
954
955 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
956 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
957 "forcing read-only mode\n");
958 res = MS_RDONLY;
959 }
960 if (read_only)
961 return res;
962 if (!(sbi->s_mount_state & EXT3_VALID_FS))
963 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
964 "running e2fsck is recommended\n");
965 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
966 printk (KERN_WARNING
967 "EXT3-fs warning: mounting fs with errors, "
968 "running e2fsck is recommended\n");
969 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
970 le16_to_cpu(es->s_mnt_count) >=
971 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
972 printk (KERN_WARNING
973 "EXT3-fs warning: maximal mount count reached, "
974 "running e2fsck is recommended\n");
975 else if (le32_to_cpu(es->s_checkinterval) &&
976 (le32_to_cpu(es->s_lastcheck) +
977 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
978 printk (KERN_WARNING
979 "EXT3-fs warning: checktime reached, "
980 "running e2fsck is recommended\n");
981#if 0
982 /* @@@ We _will_ want to clear the valid bit if we find
983 inconsistencies, to force a fsck at reboot. But for
984 a plain journaled filesystem we can keep it set as
985 valid forever! :) */
986 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
987#endif
988 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
989 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
990 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
991 es->s_mtime = cpu_to_le32(get_seconds());
992 ext3_update_dynamic_rev(sb);
993 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
994
995 ext3_commit_super(sb, es, 1);
996 if (test_opt(sb, DEBUG))
997 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
998 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
999 sb->s_blocksize,
1000 sbi->s_groups_count,
1001 EXT3_BLOCKS_PER_GROUP(sb),
1002 EXT3_INODES_PER_GROUP(sb),
1003 sbi->s_mount_opt);
1004
1005 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1006 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1007 char b[BDEVNAME_SIZE];
1008
1009 printk("external journal on %s\n",
1010 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1011 } else {
1012 printk("internal journal\n");
1013 }
1014#ifdef CONFIG_EXT3_CHECK
1015 if (test_opt (sb, CHECK)) {
1016 ext3_check_blocks_bitmap (sb);
1017 ext3_check_inodes_bitmap (sb);
1018 }
1019#endif
1020 return res;
1021}
1022
1023/* Called at mount-time, super-block is locked */
1024static int ext3_check_descriptors (struct super_block * sb)
1025{
1026 struct ext3_sb_info *sbi = EXT3_SB(sb);
1027 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1028 struct ext3_group_desc * gdp = NULL;
1029 int desc_block = 0;
1030 int i;
1031
1032 ext3_debug ("Checking group descriptors");
1033
1034 for (i = 0; i < sbi->s_groups_count; i++)
1035 {
1036 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1037 gdp = (struct ext3_group_desc *)
1038 sbi->s_group_desc[desc_block++]->b_data;
1039 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1040 le32_to_cpu(gdp->bg_block_bitmap) >=
1041 block + EXT3_BLOCKS_PER_GROUP(sb))
1042 {
1043 ext3_error (sb, "ext3_check_descriptors",
1044 "Block bitmap for group %d"
1045 " not in group (block %lu)!",
1046 i, (unsigned long)
1047 le32_to_cpu(gdp->bg_block_bitmap));
1048 return 0;
1049 }
1050 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1051 le32_to_cpu(gdp->bg_inode_bitmap) >=
1052 block + EXT3_BLOCKS_PER_GROUP(sb))
1053 {
1054 ext3_error (sb, "ext3_check_descriptors",
1055 "Inode bitmap for group %d"
1056 " not in group (block %lu)!",
1057 i, (unsigned long)
1058 le32_to_cpu(gdp->bg_inode_bitmap));
1059 return 0;
1060 }
1061 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1062 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1063 block + EXT3_BLOCKS_PER_GROUP(sb))
1064 {
1065 ext3_error (sb, "ext3_check_descriptors",
1066 "Inode table for group %d"
1067 " not in group (block %lu)!",
1068 i, (unsigned long)
1069 le32_to_cpu(gdp->bg_inode_table));
1070 return 0;
1071 }
1072 block += EXT3_BLOCKS_PER_GROUP(sb);
1073 gdp++;
1074 }
1075
1076 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1077 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1078 return 1;
1079}
1080
1081
1082/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1083 * the superblock) which were deleted from all directories, but held open by
1084 * a process at the time of a crash. We walk the list and try to delete these
1085 * inodes at recovery time (only with a read-write filesystem).
1086 *
1087 * In order to keep the orphan inode chain consistent during traversal (in
1088 * case of crash during recovery), we link each inode into the superblock
1089 * orphan list_head and handle it the same way as an inode deletion during
1090 * normal operation (which journals the operations for us).
1091 *
1092 * We only do an iget() and an iput() on each inode, which is very safe if we
1093 * accidentally point at an in-use or already deleted inode. The worst that
1094 * can happen in this case is that we get a "bit already cleared" message from
1095 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1096 * e2fsck was run on this filesystem, and it must have already done the orphan
1097 * inode cleanup for us, so we can safely abort without any further action.
1098 */
1099static void ext3_orphan_cleanup (struct super_block * sb,
1100 struct ext3_super_block * es)
1101{
1102 unsigned int s_flags = sb->s_flags;
1103 int nr_orphans = 0, nr_truncates = 0;
1104#ifdef CONFIG_QUOTA
1105 int i;
1106#endif
1107 if (!es->s_last_orphan) {
1108 jbd_debug(4, "no orphan inodes to clean up\n");
1109 return;
1110 }
1111
1112 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1113 if (es->s_last_orphan)
1114 jbd_debug(1, "Errors on filesystem, "
1115 "clearing orphan list.\n");
1116 es->s_last_orphan = 0;
1117 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1118 return;
1119 }
1120
1121 if (s_flags & MS_RDONLY) {
1122 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1123 sb->s_id);
1124 sb->s_flags &= ~MS_RDONLY;
1125 }
1126#ifdef CONFIG_QUOTA
1127 /* Needed for iput() to work correctly and not trash data */
1128 sb->s_flags |= MS_ACTIVE;
1129 /* Turn on quotas so that they are updated correctly */
1130 for (i = 0; i < MAXQUOTAS; i++) {
1131 if (EXT3_SB(sb)->s_qf_names[i]) {
1132 int ret = ext3_quota_on_mount(sb, i);
1133 if (ret < 0)
1134 printk(KERN_ERR
1135 "EXT3-fs: Cannot turn on journalled "
1136 "quota: error %d\n", ret);
1137 }
1138 }
1139#endif
1140
1141 while (es->s_last_orphan) {
1142 struct inode *inode;
1143
1144 if (!(inode =
1145 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1146 es->s_last_orphan = 0;
1147 break;
1148 }
1149
1150 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1151 DQUOT_INIT(inode);
1152 if (inode->i_nlink) {
1153 printk(KERN_DEBUG
1154 "%s: truncating inode %ld to %Ld bytes\n",
1155 __FUNCTION__, inode->i_ino, inode->i_size);
1156 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1157 inode->i_ino, inode->i_size);
1158 ext3_truncate(inode);
1159 nr_truncates++;
1160 } else {
1161 printk(KERN_DEBUG
1162 "%s: deleting unreferenced inode %ld\n",
1163 __FUNCTION__, inode->i_ino);
1164 jbd_debug(2, "deleting unreferenced inode %ld\n",
1165 inode->i_ino);
1166 nr_orphans++;
1167 }
1168 iput(inode); /* The delete magic happens here! */
1169 }
1170
1171#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1172
1173 if (nr_orphans)
1174 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1175 sb->s_id, PLURAL(nr_orphans));
1176 if (nr_truncates)
1177 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1178 sb->s_id, PLURAL(nr_truncates));
1179#ifdef CONFIG_QUOTA
1180 /* Turn quotas off */
1181 for (i = 0; i < MAXQUOTAS; i++) {
1182 if (sb_dqopt(sb)->files[i])
1183 vfs_quota_off(sb, i);
1184 }
1185#endif
1186 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1187}
1188
1189#define log2(n) ffz(~(n))
1190
1191/*
1192 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1193 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1194 * We need to be 1 filesystem block less than the 2^32 sector limit.
1195 */
1196static loff_t ext3_max_size(int bits)
1197{
1198 loff_t res = EXT3_NDIR_BLOCKS;
1199 /* This constant is calculated to be the largest file size for a
1200 * dense, 4k-blocksize file such that the total number of
1201 * sectors in the file, including data and all indirect blocks,
1202 * does not exceed 2^32. */
1203 const loff_t upper_limit = 0x1ff7fffd000LL;
1204
1205 res += 1LL << (bits-2);
1206 res += 1LL << (2*(bits-2));
1207 res += 1LL << (3*(bits-2));
1208 res <<= bits;
1209 if (res > upper_limit)
1210 res = upper_limit;
1211 return res;
1212}
1213
1214static unsigned long descriptor_loc(struct super_block *sb,
1215 unsigned long logic_sb_block,
1216 int nr)
1217{
1218 struct ext3_sb_info *sbi = EXT3_SB(sb);
1219 unsigned long bg, first_data_block, first_meta_bg;
1220 int has_super = 0;
1221
1222 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1223 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1224
1225 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1226 nr < first_meta_bg)
1227 return (logic_sb_block + nr + 1);
1228 bg = sbi->s_desc_per_block * nr;
1229 if (ext3_bg_has_super(sb, bg))
1230 has_super = 1;
1231 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1232}
1233
1234
1235static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1236{
1237 struct buffer_head * bh;
1238 struct ext3_super_block *es = NULL;
1239 struct ext3_sb_info *sbi;
1240 unsigned long block;
1241 unsigned long sb_block = get_sb_block(&data);
1242 unsigned long logic_sb_block;
1243 unsigned long offset = 0;
1244 unsigned long journal_inum = 0;
1245 unsigned long def_mount_opts;
1246 struct inode *root;
1247 int blocksize;
1248 int hblock;
1249 int db_count;
1250 int i;
1251 int needs_recovery;
1252 __le32 features;
1253
1254 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1255 if (!sbi)
1256 return -ENOMEM;
1257 sb->s_fs_info = sbi;
1258 memset(sbi, 0, sizeof(*sbi));
1259 sbi->s_mount_opt = 0;
1260 sbi->s_resuid = EXT3_DEF_RESUID;
1261 sbi->s_resgid = EXT3_DEF_RESGID;
1262
1263 unlock_kernel();
1264
1265 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1266 if (!blocksize) {
1267 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1268 goto out_fail;
1269 }
1270
1271 /*
1272 * The ext3 superblock will not be buffer aligned for other than 1kB
1273 * block sizes. We need to calculate the offset from buffer start.
1274 */
1275 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1276 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1277 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1278 } else {
1279 logic_sb_block = sb_block;
1280 }
1281
1282 if (!(bh = sb_bread(sb, logic_sb_block))) {
1283 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1284 goto out_fail;
1285 }
1286 /*
1287 * Note: s_es must be initialized as soon as possible because
1288 * some ext3 macro-instructions depend on its value
1289 */
1290 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1291 sbi->s_es = es;
1292 sb->s_magic = le16_to_cpu(es->s_magic);
1293 if (sb->s_magic != EXT3_SUPER_MAGIC)
1294 goto cantfind_ext3;
1295
1296 /* Set defaults before we parse the mount options */
1297 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1298 if (def_mount_opts & EXT3_DEFM_DEBUG)
1299 set_opt(sbi->s_mount_opt, DEBUG);
1300 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1301 set_opt(sbi->s_mount_opt, GRPID);
1302 if (def_mount_opts & EXT3_DEFM_UID16)
1303 set_opt(sbi->s_mount_opt, NO_UID32);
1304 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1305 set_opt(sbi->s_mount_opt, XATTR_USER);
1306 if (def_mount_opts & EXT3_DEFM_ACL)
1307 set_opt(sbi->s_mount_opt, POSIX_ACL);
1308 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1309 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1310 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1311 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1312 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1313 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1314
1315 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1316 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1317 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1318 set_opt(sbi->s_mount_opt, ERRORS_RO);
1319
1320 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1321 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1322
1323 set_opt(sbi->s_mount_opt, RESERVATION);
1324
1325 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1326 goto failed_mount;
1327
1328 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1329 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1330
1331 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1332 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1333 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1334 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1335 printk(KERN_WARNING
1336 "EXT3-fs warning: feature flags set on rev 0 fs, "
1337 "running e2fsck is recommended\n");
1338 /*
1339 * Check feature flags regardless of the revision level, since we
1340 * previously didn't change the revision level when setting the flags,
1341 * so there is a chance incompat flags are set on a rev 0 filesystem.
1342 */
1343 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1344 if (features) {
1345 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1346 "unsupported optional features (%x).\n",
1347 sb->s_id, le32_to_cpu(features));
1348 goto failed_mount;
1349 }
1350 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1351 if (!(sb->s_flags & MS_RDONLY) && features) {
1352 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1353 "unsupported optional features (%x).\n",
1354 sb->s_id, le32_to_cpu(features));
1355 goto failed_mount;
1356 }
1357 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1358
1359 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1360 blocksize > EXT3_MAX_BLOCK_SIZE) {
1361 printk(KERN_ERR
1362 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1363 blocksize, sb->s_id);
1364 goto failed_mount;
1365 }
1366
1367 hblock = bdev_hardsect_size(sb->s_bdev);
1368 if (sb->s_blocksize != blocksize) {
1369 /*
1370 * Make sure the blocksize for the filesystem is larger
1371 * than the hardware sectorsize for the machine.
1372 */
1373 if (blocksize < hblock) {
1374 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1375 "device blocksize %d.\n", blocksize, hblock);
1376 goto failed_mount;
1377 }
1378
1379 brelse (bh);
1380 sb_set_blocksize(sb, blocksize);
1381 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1382 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1383 bh = sb_bread(sb, logic_sb_block);
1384 if (!bh) {
1385 printk(KERN_ERR
1386 "EXT3-fs: Can't read superblock on 2nd try.\n");
1387 goto failed_mount;
1388 }
1389 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1390 sbi->s_es = es;
1391 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1392 printk (KERN_ERR
1393 "EXT3-fs: Magic mismatch, very weird !\n");
1394 goto failed_mount;
1395 }
1396 }
1397
1398 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1399
1400 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1401 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1402 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1403 } else {
1404 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1405 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1406 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1407 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1408 (sbi->s_inode_size > blocksize)) {
1409 printk (KERN_ERR
1410 "EXT3-fs: unsupported inode size: %d\n",
1411 sbi->s_inode_size);
1412 goto failed_mount;
1413 }
1414 }
1415 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1416 le32_to_cpu(es->s_log_frag_size);
1417 if (blocksize != sbi->s_frag_size) {
1418 printk(KERN_ERR
1419 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1420 sbi->s_frag_size, blocksize);
1421 goto failed_mount;
1422 }
1423 sbi->s_frags_per_block = 1;
1424 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1425 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1426 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1427 if (EXT3_INODE_SIZE(sb) == 0)
1428 goto cantfind_ext3;
1429 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1430 if (sbi->s_inodes_per_block == 0)
1431 goto cantfind_ext3;
1432 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1433 sbi->s_inodes_per_block;
1434 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1435 sbi->s_sbh = bh;
1436 sbi->s_mount_state = le16_to_cpu(es->s_state);
1437 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1438 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1439 for (i=0; i < 4; i++)
1440 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1441 sbi->s_def_hash_version = es->s_def_hash_version;
1442
1443 if (sbi->s_blocks_per_group > blocksize * 8) {
1444 printk (KERN_ERR
1445 "EXT3-fs: #blocks per group too big: %lu\n",
1446 sbi->s_blocks_per_group);
1447 goto failed_mount;
1448 }
1449 if (sbi->s_frags_per_group > blocksize * 8) {
1450 printk (KERN_ERR
1451 "EXT3-fs: #fragments per group too big: %lu\n",
1452 sbi->s_frags_per_group);
1453 goto failed_mount;
1454 }
1455 if (sbi->s_inodes_per_group > blocksize * 8) {
1456 printk (KERN_ERR
1457 "EXT3-fs: #inodes per group too big: %lu\n",
1458 sbi->s_inodes_per_group);
1459 goto failed_mount;
1460 }
1461
1462 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1463 goto cantfind_ext3;
1464 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1465 le32_to_cpu(es->s_first_data_block) +
1466 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1467 EXT3_BLOCKS_PER_GROUP(sb);
1468 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1469 EXT3_DESC_PER_BLOCK(sb);
1470 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1471 GFP_KERNEL);
1472 if (sbi->s_group_desc == NULL) {
1473 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1474 goto failed_mount;
1475 }
1476
1477 percpu_counter_init(&sbi->s_freeblocks_counter);
1478 percpu_counter_init(&sbi->s_freeinodes_counter);
1479 percpu_counter_init(&sbi->s_dirs_counter);
1480 bgl_lock_init(&sbi->s_blockgroup_lock);
1481
1482 for (i = 0; i < db_count; i++) {
1483 block = descriptor_loc(sb, logic_sb_block, i);
1484 sbi->s_group_desc[i] = sb_bread(sb, block);
1485 if (!sbi->s_group_desc[i]) {
1486 printk (KERN_ERR "EXT3-fs: "
1487 "can't read group descriptor %d\n", i);
1488 db_count = i;
1489 goto failed_mount2;
1490 }
1491 }
1492 if (!ext3_check_descriptors (sb)) {
1493 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1494 goto failed_mount2;
1495 }
1496 sbi->s_gdb_count = db_count;
1497 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1498 spin_lock_init(&sbi->s_next_gen_lock);
1499 /* per fileystem reservation list head & lock */
1500 spin_lock_init(&sbi->s_rsv_window_lock);
1501 sbi->s_rsv_window_root = RB_ROOT;
1502 /* Add a single, static dummy reservation to the start of the
1503 * reservation window list --- it gives us a placeholder for
1504 * append-at-start-of-list which makes the allocation logic
1505 * _much_ simpler. */
1506 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1507 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1508 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1509 sbi->s_rsv_window_head.rsv_goal_size = 0;
1510 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1511
1512 /*
1513 * set up enough so that it can read an inode
1514 */
1515 sb->s_op = &ext3_sops;
1516 sb->s_export_op = &ext3_export_ops;
1517 sb->s_xattr = ext3_xattr_handlers;
1518#ifdef CONFIG_QUOTA
1519 sb->s_qcop = &ext3_qctl_operations;
1520 sb->dq_op = &ext3_quota_operations;
1521#endif
1522 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1523
1524 sb->s_root = NULL;
1525
1526 needs_recovery = (es->s_last_orphan != 0 ||
1527 EXT3_HAS_INCOMPAT_FEATURE(sb,
1528 EXT3_FEATURE_INCOMPAT_RECOVER));
1529
1530 /*
1531 * The first inode we look at is the journal inode. Don't try
1532 * root first: it may be modified in the journal!
1533 */
1534 if (!test_opt(sb, NOLOAD) &&
1535 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1536 if (ext3_load_journal(sb, es))
1537 goto failed_mount2;
1538 } else if (journal_inum) {
1539 if (ext3_create_journal(sb, es, journal_inum))
1540 goto failed_mount2;
1541 } else {
1542 if (!silent)
1543 printk (KERN_ERR
1544 "ext3: No journal on filesystem on %s\n",
1545 sb->s_id);
1546 goto failed_mount2;
1547 }
1548
1549 /* We have now updated the journal if required, so we can
1550 * validate the data journaling mode. */
1551 switch (test_opt(sb, DATA_FLAGS)) {
1552 case 0:
1553 /* No mode set, assume a default based on the journal
1554 capabilities: ORDERED_DATA if the journal can
1555 cope, else JOURNAL_DATA */
1556 if (journal_check_available_features
1557 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1558 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1559 else
1560 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1561 break;
1562
1563 case EXT3_MOUNT_ORDERED_DATA:
1564 case EXT3_MOUNT_WRITEBACK_DATA:
1565 if (!journal_check_available_features
1566 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1567 printk(KERN_ERR "EXT3-fs: Journal does not support "
1568 "requested data journaling mode\n");
1569 goto failed_mount3;
1570 }
1571 default:
1572 break;
1573 }
1574
1575 if (test_opt(sb, NOBH)) {
1576 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1577 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1578 "since filesystem blocksize doesn't match "
1579 "pagesize\n");
1580 clear_opt(sbi->s_mount_opt, NOBH);
1581 }
1582 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1583 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1584 "its supported only with writeback mode\n");
1585 clear_opt(sbi->s_mount_opt, NOBH);
1586 }
1587 }
1588 /*
1589 * The journal_load will have done any necessary log recovery,
1590 * so we can safely mount the rest of the filesystem now.
1591 */
1592
1593 root = iget(sb, EXT3_ROOT_INO);
1594 sb->s_root = d_alloc_root(root);
1595 if (!sb->s_root) {
1596 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1597 iput(root);
1598 goto failed_mount3;
1599 }
1600 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1601 dput(sb->s_root);
1602 sb->s_root = NULL;
1603 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1604 goto failed_mount3;
1605 }
1606
1607 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1608 /*
1609 * akpm: core read_super() calls in here with the superblock locked.
1610 * That deadlocks, because orphan cleanup needs to lock the superblock
1611 * in numerous places. Here we just pop the lock - it's relatively
1612 * harmless, because we are now ready to accept write_super() requests,
1613 * and aviro says that's the only reason for hanging onto the
1614 * superblock lock.
1615 */
1616 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1617 ext3_orphan_cleanup(sb, es);
1618 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1619 if (needs_recovery)
1620 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1621 ext3_mark_recovery_complete(sb, es);
1622 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1623 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1624 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1625 "writeback");
1626
1627 percpu_counter_mod(&sbi->s_freeblocks_counter,
1628 ext3_count_free_blocks(sb));
1629 percpu_counter_mod(&sbi->s_freeinodes_counter,
1630 ext3_count_free_inodes(sb));
1631 percpu_counter_mod(&sbi->s_dirs_counter,
1632 ext3_count_dirs(sb));
1633
1634 lock_kernel();
1635 return 0;
1636
1637cantfind_ext3:
1638 if (!silent)
1639 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1640 sb->s_id);
1641 goto failed_mount;
1642
1643failed_mount3:
1644 journal_destroy(sbi->s_journal);
1645failed_mount2:
1646 for (i = 0; i < db_count; i++)
1647 brelse(sbi->s_group_desc[i]);
1648 kfree(sbi->s_group_desc);
1649failed_mount:
1650#ifdef CONFIG_QUOTA
1651 for (i = 0; i < MAXQUOTAS; i++)
1652 kfree(sbi->s_qf_names[i]);
1653#endif
1654 ext3_blkdev_remove(sbi);
1655 brelse(bh);
1656out_fail:
1657 sb->s_fs_info = NULL;
1658 kfree(sbi);
1659 lock_kernel();
1660 return -EINVAL;
1661}
1662
1663/*
1664 * Setup any per-fs journal parameters now. We'll do this both on
1665 * initial mount, once the journal has been initialised but before we've
1666 * done any recovery; and again on any subsequent remount.
1667 */
1668static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1669{
1670 struct ext3_sb_info *sbi = EXT3_SB(sb);
1671
1672 if (sbi->s_commit_interval)
1673 journal->j_commit_interval = sbi->s_commit_interval;
1674 /* We could also set up an ext3-specific default for the commit
1675 * interval here, but for now we'll just fall back to the jbd
1676 * default. */
1677
1678 spin_lock(&journal->j_state_lock);
1679 if (test_opt(sb, BARRIER))
1680 journal->j_flags |= JFS_BARRIER;
1681 else
1682 journal->j_flags &= ~JFS_BARRIER;
1683 spin_unlock(&journal->j_state_lock);
1684}
1685
1686static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1687{
1688 struct inode *journal_inode;
1689 journal_t *journal;
1690
1691 /* First, test for the existence of a valid inode on disk. Bad
1692 * things happen if we iget() an unused inode, as the subsequent
1693 * iput() will try to delete it. */
1694
1695 journal_inode = iget(sb, journal_inum);
1696 if (!journal_inode) {
1697 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1698 return NULL;
1699 }
1700 if (!journal_inode->i_nlink) {
1701 make_bad_inode(journal_inode);
1702 iput(journal_inode);
1703 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1704 return NULL;
1705 }
1706
1707 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1708 journal_inode, journal_inode->i_size);
1709 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1710 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1711 iput(journal_inode);
1712 return NULL;
1713 }
1714
1715 journal = journal_init_inode(journal_inode);
1716 if (!journal) {
1717 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1718 iput(journal_inode);
1719 return NULL;
1720 }
1721 journal->j_private = sb;
1722 ext3_init_journal_params(sb, journal);
1723 return journal;
1724}
1725
1726static journal_t *ext3_get_dev_journal(struct super_block *sb,
1727 dev_t j_dev)
1728{
1729 struct buffer_head * bh;
1730 journal_t *journal;
1731 int start;
1732 int len;
1733 int hblock, blocksize;
1734 unsigned long sb_block;
1735 unsigned long offset;
1736 struct ext3_super_block * es;
1737 struct block_device *bdev;
1738
1739 bdev = ext3_blkdev_get(j_dev);
1740 if (bdev == NULL)
1741 return NULL;
1742
1743 if (bd_claim(bdev, sb)) {
1744 printk(KERN_ERR
1745 "EXT3: failed to claim external journal device.\n");
1746 blkdev_put(bdev);
1747 return NULL;
1748 }
1749
1750 blocksize = sb->s_blocksize;
1751 hblock = bdev_hardsect_size(bdev);
1752 if (blocksize < hblock) {
1753 printk(KERN_ERR
1754 "EXT3-fs: blocksize too small for journal device.\n");
1755 goto out_bdev;
1756 }
1757
1758 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1759 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1760 set_blocksize(bdev, blocksize);
1761 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1762 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1763 "external journal\n");
1764 goto out_bdev;
1765 }
1766
1767 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1768 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1769 !(le32_to_cpu(es->s_feature_incompat) &
1770 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1771 printk(KERN_ERR "EXT3-fs: external journal has "
1772 "bad superblock\n");
1773 brelse(bh);
1774 goto out_bdev;
1775 }
1776
1777 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1778 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1779 brelse(bh);
1780 goto out_bdev;
1781 }
1782
1783 len = le32_to_cpu(es->s_blocks_count);
1784 start = sb_block + 1;
1785 brelse(bh); /* we're done with the superblock */
1786
1787 journal = journal_init_dev(bdev, sb->s_bdev,
1788 start, len, blocksize);
1789 if (!journal) {
1790 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1791 goto out_bdev;
1792 }
1793 journal->j_private = sb;
1794 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1795 wait_on_buffer(journal->j_sb_buffer);
1796 if (!buffer_uptodate(journal->j_sb_buffer)) {
1797 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1798 goto out_journal;
1799 }
1800 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1801 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1802 "user (unsupported) - %d\n",
1803 be32_to_cpu(journal->j_superblock->s_nr_users));
1804 goto out_journal;
1805 }
1806 EXT3_SB(sb)->journal_bdev = bdev;
1807 ext3_init_journal_params(sb, journal);
1808 return journal;
1809out_journal:
1810 journal_destroy(journal);
1811out_bdev:
1812 ext3_blkdev_put(bdev);
1813 return NULL;
1814}
1815
1816static int ext3_load_journal(struct super_block * sb,
1817 struct ext3_super_block * es)
1818{
1819 journal_t *journal;
1820 int journal_inum = le32_to_cpu(es->s_journal_inum);
1821 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1822 int err = 0;
1823 int really_read_only;
1824
1825 really_read_only = bdev_read_only(sb->s_bdev);
1826
1827 /*
1828 * Are we loading a blank journal or performing recovery after a
1829 * crash? For recovery, we need to check in advance whether we
1830 * can get read-write access to the device.
1831 */
1832
1833 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1834 if (sb->s_flags & MS_RDONLY) {
1835 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1836 "required on readonly filesystem.\n");
1837 if (really_read_only) {
1838 printk(KERN_ERR "EXT3-fs: write access "
1839 "unavailable, cannot proceed.\n");
1840 return -EROFS;
1841 }
1842 printk (KERN_INFO "EXT3-fs: write access will "
1843 "be enabled during recovery.\n");
1844 }
1845 }
1846
1847 if (journal_inum && journal_dev) {
1848 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1849 "and inode journals!\n");
1850 return -EINVAL;
1851 }
1852
1853 if (journal_inum) {
1854 if (!(journal = ext3_get_journal(sb, journal_inum)))
1855 return -EINVAL;
1856 } else {
1857 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1858 return -EINVAL;
1859 }
1860
1861 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1862 err = journal_update_format(journal);
1863 if (err) {
1864 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1865 journal_destroy(journal);
1866 return err;
1867 }
1868 }
1869
1870 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1871 err = journal_wipe(journal, !really_read_only);
1872 if (!err)
1873 err = journal_load(journal);
1874
1875 if (err) {
1876 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1877 journal_destroy(journal);
1878 return err;
1879 }
1880
1881 EXT3_SB(sb)->s_journal = journal;
1882 ext3_clear_journal_err(sb, es);
1883 return 0;
1884}
1885
1886static int ext3_create_journal(struct super_block * sb,
1887 struct ext3_super_block * es,
1888 int journal_inum)
1889{
1890 journal_t *journal;
1891
1892 if (sb->s_flags & MS_RDONLY) {
1893 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1894 "create journal.\n");
1895 return -EROFS;
1896 }
1897
1898 if (!(journal = ext3_get_journal(sb, journal_inum)))
1899 return -EINVAL;
1900
1901 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1902 journal_inum);
1903
1904 if (journal_create(journal)) {
1905 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
1906 journal_destroy(journal);
1907 return -EIO;
1908 }
1909
1910 EXT3_SB(sb)->s_journal = journal;
1911
1912 ext3_update_dynamic_rev(sb);
1913 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1914 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
1915
1916 es->s_journal_inum = cpu_to_le32(journal_inum);
1917 sb->s_dirt = 1;
1918
1919 /* Make sure we flush the recovery flag to disk. */
1920 ext3_commit_super(sb, es, 1);
1921
1922 return 0;
1923}
1924
1925static void ext3_commit_super (struct super_block * sb,
1926 struct ext3_super_block * es,
1927 int sync)
1928{
1929 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
1930
1931 if (!sbh)
1932 return;
1933 es->s_wtime = cpu_to_le32(get_seconds());
1934 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
1935 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
1936 BUFFER_TRACE(sbh, "marking dirty");
1937 mark_buffer_dirty(sbh);
1938 if (sync)
1939 sync_dirty_buffer(sbh);
1940}
1941
1942
1943/*
1944 * Have we just finished recovery? If so, and if we are mounting (or
1945 * remounting) the filesystem readonly, then we will end up with a
1946 * consistent fs on disk. Record that fact.
1947 */
1948static void ext3_mark_recovery_complete(struct super_block * sb,
1949 struct ext3_super_block * es)
1950{
1951 journal_t *journal = EXT3_SB(sb)->s_journal;
1952
1953 journal_lock_updates(journal);
1954 journal_flush(journal);
1955 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
1956 sb->s_flags & MS_RDONLY) {
1957 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1958 sb->s_dirt = 0;
1959 ext3_commit_super(sb, es, 1);
1960 }
1961 journal_unlock_updates(journal);
1962}
1963
1964/*
1965 * If we are mounting (or read-write remounting) a filesystem whose journal
1966 * has recorded an error from a previous lifetime, move that error to the
1967 * main filesystem now.
1968 */
1969static void ext3_clear_journal_err(struct super_block * sb,
1970 struct ext3_super_block * es)
1971{
1972 journal_t *journal;
1973 int j_errno;
1974 const char *errstr;
1975
1976 journal = EXT3_SB(sb)->s_journal;
1977
1978 /*
1979 * Now check for any error status which may have been recorded in the
1980 * journal by a prior ext3_error() or ext3_abort()
1981 */
1982
1983 j_errno = journal_errno(journal);
1984 if (j_errno) {
1985 char nbuf[16];
1986
1987 errstr = ext3_decode_error(sb, j_errno, nbuf);
1988 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
1989 "from previous mount: %s", errstr);
1990 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
1991 "filesystem check.");
1992
1993 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
1994 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
1995 ext3_commit_super (sb, es, 1);
1996
1997 journal_clear_err(journal);
1998 }
1999}
2000
2001/*
2002 * Force the running and committing transactions to commit,
2003 * and wait on the commit.
2004 */
2005int ext3_force_commit(struct super_block *sb)
2006{
2007 journal_t *journal;
2008 int ret;
2009
2010 if (sb->s_flags & MS_RDONLY)
2011 return 0;
2012
2013 journal = EXT3_SB(sb)->s_journal;
2014 sb->s_dirt = 0;
2015 ret = ext3_journal_force_commit(journal);
2016 return ret;
2017}
2018
2019/*
2020 * Ext3 always journals updates to the superblock itself, so we don't
2021 * have to propagate any other updates to the superblock on disk at this
2022 * point. Just start an async writeback to get the buffers on their way
2023 * to the disk.
2024 *
2025 * This implicitly triggers the writebehind on sync().
2026 */
2027
2028static void ext3_write_super (struct super_block * sb)
2029{
2030 if (down_trylock(&sb->s_lock) == 0)
2031 BUG();
2032 sb->s_dirt = 0;
2033}
2034
2035static int ext3_sync_fs(struct super_block *sb, int wait)
2036{
2037 tid_t target;
2038
2039 sb->s_dirt = 0;
2040 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2041 if (wait)
2042 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2043 }
2044 return 0;
2045}
2046
2047/*
2048 * LVM calls this function before a (read-only) snapshot is created. This
2049 * gives us a chance to flush the journal completely and mark the fs clean.
2050 */
2051static void ext3_write_super_lockfs(struct super_block *sb)
2052{
2053 sb->s_dirt = 0;
2054
2055 if (!(sb->s_flags & MS_RDONLY)) {
2056 journal_t *journal = EXT3_SB(sb)->s_journal;
2057
2058 /* Now we set up the journal barrier. */
2059 journal_lock_updates(journal);
2060 journal_flush(journal);
2061
2062 /* Journal blocked and flushed, clear needs_recovery flag. */
2063 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2064 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2065 }
2066}
2067
2068/*
2069 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2070 * flag here, even though the filesystem is not technically dirty yet.
2071 */
2072static void ext3_unlockfs(struct super_block *sb)
2073{
2074 if (!(sb->s_flags & MS_RDONLY)) {
2075 lock_super(sb);
2076 /* Reser the needs_recovery flag before the fs is unlocked. */
2077 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2078 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2079 unlock_super(sb);
2080 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2081 }
2082}
2083
2084static int ext3_remount (struct super_block * sb, int * flags, char * data)
2085{
2086 struct ext3_super_block * es;
2087 struct ext3_sb_info *sbi = EXT3_SB(sb);
2088 unsigned long tmp;
2089 unsigned long n_blocks_count = 0;
2090
2091 /*
2092 * Allow the "check" option to be passed as a remount option.
2093 */
2094 if (!parse_options(data, sb, &tmp, &n_blocks_count, 1))
2095 return -EINVAL;
2096
2097 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2098 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2099
2100 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2101 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2102
2103 es = sbi->s_es;
2104
2105 ext3_init_journal_params(sb, sbi->s_journal);
2106
2107 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2108 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2109 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2110 return -EROFS;
2111
2112 if (*flags & MS_RDONLY) {
2113 /*
2114 * First of all, the unconditional stuff we have to do
2115 * to disable replay of the journal when we next remount
2116 */
2117 sb->s_flags |= MS_RDONLY;
2118
2119 /*
2120 * OK, test if we are remounting a valid rw partition
2121 * readonly, and if so set the rdonly flag and then
2122 * mark the partition as valid again.
2123 */
2124 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2125 (sbi->s_mount_state & EXT3_VALID_FS))
2126 es->s_state = cpu_to_le16(sbi->s_mount_state);
2127
2128 ext3_mark_recovery_complete(sb, es);
2129 } else {
2130 __le32 ret;
2131 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2132 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2133 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2134 "remount RDWR because of unsupported "
2135 "optional features (%x).\n",
2136 sb->s_id, le32_to_cpu(ret));
2137 return -EROFS;
2138 }
2139 /*
2140 * Mounting a RDONLY partition read-write, so reread
2141 * and store the current valid flag. (It may have
2142 * been changed by e2fsck since we originally mounted
2143 * the partition.)
2144 */
2145 ext3_clear_journal_err(sb, es);
2146 sbi->s_mount_state = le16_to_cpu(es->s_state);
2147 if ((ret = ext3_group_extend(sb, es, n_blocks_count)))
2148 return ret;
2149 if (!ext3_setup_super (sb, es, 0))
2150 sb->s_flags &= ~MS_RDONLY;
2151 }
2152 }
2153 return 0;
2154}
2155
2156static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2157{
2158 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2159 unsigned long overhead;
2160 int i;
2161
2162 if (test_opt (sb, MINIX_DF))
2163 overhead = 0;
2164 else {
2165 unsigned long ngroups;
2166 ngroups = EXT3_SB(sb)->s_groups_count;
2167 smp_rmb();
2168
2169 /*
2170 * Compute the overhead (FS structures)
2171 */
2172
2173 /*
2174 * All of the blocks before first_data_block are
2175 * overhead
2176 */
2177 overhead = le32_to_cpu(es->s_first_data_block);
2178
2179 /*
2180 * Add the overhead attributed to the superblock and
2181 * block group descriptors. If the sparse superblocks
2182 * feature is turned on, then not all groups have this.
2183 */
2184 for (i = 0; i < ngroups; i++) {
2185 overhead += ext3_bg_has_super(sb, i) +
2186 ext3_bg_num_gdb(sb, i);
2187 cond_resched();
2188 }
2189
2190 /*
2191 * Every block group has an inode bitmap, a block
2192 * bitmap, and an inode table.
2193 */
2194 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2195 }
2196
2197 buf->f_type = EXT3_SUPER_MAGIC;
2198 buf->f_bsize = sb->s_blocksize;
2199 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2200 buf->f_bfree = ext3_count_free_blocks (sb);
2201 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2202 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2203 buf->f_bavail = 0;
2204 buf->f_files = le32_to_cpu(es->s_inodes_count);
2205 buf->f_ffree = ext3_count_free_inodes (sb);
2206 buf->f_namelen = EXT3_NAME_LEN;
2207 return 0;
2208}
2209
2210/* Helper function for writing quotas on sync - we need to start transaction before quota file
2211 * is locked for write. Otherwise the are possible deadlocks:
2212 * Process 1 Process 2
2213 * ext3_create() quota_sync()
2214 * journal_start() write_dquot()
2215 * DQUOT_INIT() down(dqio_sem)
2216 * down(dqio_sem) journal_start()
2217 *
2218 */
2219
2220#ifdef CONFIG_QUOTA
2221
2222static inline struct inode *dquot_to_inode(struct dquot *dquot)
2223{
2224 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2225}
2226
2227static int ext3_dquot_initialize(struct inode *inode, int type)
2228{
2229 handle_t *handle;
2230 int ret, err;
2231
2232 /* We may create quota structure so we need to reserve enough blocks */
2233 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS);
2234 if (IS_ERR(handle))
2235 return PTR_ERR(handle);
2236 ret = dquot_initialize(inode, type);
2237 err = ext3_journal_stop(handle);
2238 if (!ret)
2239 ret = err;
2240 return ret;
2241}
2242
2243static int ext3_dquot_drop(struct inode *inode)
2244{
2245 handle_t *handle;
2246 int ret, err;
2247
2248 /* We may delete quota structure so we need to reserve enough blocks */
2249 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS);
2250 if (IS_ERR(handle))
2251 return PTR_ERR(handle);
2252 ret = dquot_drop(inode);
2253 err = ext3_journal_stop(handle);
2254 if (!ret)
2255 ret = err;
2256 return ret;
2257}
2258
2259static int ext3_write_dquot(struct dquot *dquot)
2260{
2261 int ret, err;
2262 handle_t *handle;
2263 struct inode *inode;
2264
2265 inode = dquot_to_inode(dquot);
2266 handle = ext3_journal_start(inode,
2267 EXT3_QUOTA_TRANS_BLOCKS);
2268 if (IS_ERR(handle))
2269 return PTR_ERR(handle);
2270 ret = dquot_commit(dquot);
2271 err = ext3_journal_stop(handle);
2272 if (!ret)
2273 ret = err;
2274 return ret;
2275}
2276
2277static int ext3_acquire_dquot(struct dquot *dquot)
2278{
2279 int ret, err;
2280 handle_t *handle;
2281
2282 handle = ext3_journal_start(dquot_to_inode(dquot),
2283 EXT3_QUOTA_INIT_BLOCKS);
2284 if (IS_ERR(handle))
2285 return PTR_ERR(handle);
2286 ret = dquot_acquire(dquot);
2287 err = ext3_journal_stop(handle);
2288 if (!ret)
2289 ret = err;
2290 return ret;
2291}
2292
2293static int ext3_release_dquot(struct dquot *dquot)
2294{
2295 int ret, err;
2296 handle_t *handle;
2297
2298 handle = ext3_journal_start(dquot_to_inode(dquot),
2299 EXT3_QUOTA_INIT_BLOCKS);
2300 if (IS_ERR(handle))
2301 return PTR_ERR(handle);
2302 ret = dquot_release(dquot);
2303 err = ext3_journal_stop(handle);
2304 if (!ret)
2305 ret = err;
2306 return ret;
2307}
2308
2309static int ext3_mark_dquot_dirty(struct dquot *dquot)
2310{
2311 /* Are we journalling quotas? */
2312 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2313 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2314 dquot_mark_dquot_dirty(dquot);
2315 return ext3_write_dquot(dquot);
2316 } else {
2317 return dquot_mark_dquot_dirty(dquot);
2318 }
2319}
2320
2321static int ext3_write_info(struct super_block *sb, int type)
2322{
2323 int ret, err;
2324 handle_t *handle;
2325
2326 /* Data block + inode block */
2327 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2328 if (IS_ERR(handle))
2329 return PTR_ERR(handle);
2330 ret = dquot_commit_info(sb, type);
2331 err = ext3_journal_stop(handle);
2332 if (!ret)
2333 ret = err;
2334 return ret;
2335}
2336
2337/*
2338 * Turn on quotas during mount time - we need to find
2339 * the quota file and such...
2340 */
2341static int ext3_quota_on_mount(struct super_block *sb, int type)
2342{
2343 int err;
2344 struct dentry *dentry;
2345 struct qstr name = { .name = EXT3_SB(sb)->s_qf_names[type],
2346 .hash = 0,
2347 .len = strlen(EXT3_SB(sb)->s_qf_names[type])};
2348
2349 dentry = lookup_hash(&name, sb->s_root);
2350 if (IS_ERR(dentry))
2351 return PTR_ERR(dentry);
2352 err = vfs_quota_on_mount(type, EXT3_SB(sb)->s_jquota_fmt, dentry);
2353 /* Now invalidate and put the dentry - quota got its own reference
2354 * to inode and dentry has at least wrong hash so we had better
2355 * throw it away */
2356 d_invalidate(dentry);
2357 dput(dentry);
2358 return err;
2359}
2360
2361/*
2362 * Standard function to be called on quota_on
2363 */
2364static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2365 char *path)
2366{
2367 int err;
2368 struct nameidata nd;
2369
2370 /* Not journalling quota? */
2371 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2372 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2373 return vfs_quota_on(sb, type, format_id, path);
2374 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2375 if (err)
2376 return err;
2377 /* Quotafile not on the same filesystem? */
2378 if (nd.mnt->mnt_sb != sb) {
2379 path_release(&nd);
2380 return -EXDEV;
2381 }
2382 /* Quotafile not of fs root? */
2383 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2384 printk(KERN_WARNING
2385 "EXT3-fs: Quota file not on filesystem root. "
2386 "Journalled quota will not work.\n");
2387 path_release(&nd);
2388 return vfs_quota_on(sb, type, format_id, path);
2389}
2390
2391/* Read data from quotafile - avoid pagecache and such because we cannot afford
2392 * acquiring the locks... As quota files are never truncated and quota code
2393 * itself serializes the operations (and noone else should touch the files)
2394 * we don't have to be afraid of races */
2395static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2396 size_t len, loff_t off)
2397{
2398 struct inode *inode = sb_dqopt(sb)->files[type];
2399 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2400 int err = 0;
2401 int offset = off & (sb->s_blocksize - 1);
2402 int tocopy;
2403 size_t toread;
2404 struct buffer_head *bh;
2405 loff_t i_size = i_size_read(inode);
2406
2407 if (off > i_size)
2408 return 0;
2409 if (off+len > i_size)
2410 len = i_size-off;
2411 toread = len;
2412 while (toread > 0) {
2413 tocopy = sb->s_blocksize - offset < toread ?
2414 sb->s_blocksize - offset : toread;
2415 bh = ext3_bread(NULL, inode, blk, 0, &err);
2416 if (err)
2417 return err;
2418 if (!bh) /* A hole? */
2419 memset(data, 0, tocopy);
2420 else
2421 memcpy(data, bh->b_data+offset, tocopy);
2422 brelse(bh);
2423 offset = 0;
2424 toread -= tocopy;
2425 data += tocopy;
2426 blk++;
2427 }
2428 return len;
2429}
2430
2431/* Write to quotafile (we know the transaction is already started and has
2432 * enough credits) */
2433static ssize_t ext3_quota_write(struct super_block *sb, int type,
2434 const char *data, size_t len, loff_t off)
2435{
2436 struct inode *inode = sb_dqopt(sb)->files[type];
2437 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2438 int err = 0;
2439 int offset = off & (sb->s_blocksize - 1);
2440 int tocopy;
2441 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2442 size_t towrite = len;
2443 struct buffer_head *bh;
2444 handle_t *handle = journal_current_handle();
2445
2446 down(&inode->i_sem);
2447 while (towrite > 0) {
2448 tocopy = sb->s_blocksize - offset < towrite ?
2449 sb->s_blocksize - offset : towrite;
2450 bh = ext3_bread(handle, inode, blk, 1, &err);
2451 if (!bh)
2452 goto out;
2453 if (journal_quota) {
2454 err = ext3_journal_get_write_access(handle, bh);
2455 if (err) {
2456 brelse(bh);
2457 goto out;
2458 }
2459 }
2460 lock_buffer(bh);
2461 memcpy(bh->b_data+offset, data, tocopy);
2462 flush_dcache_page(bh->b_page);
2463 unlock_buffer(bh);
2464 if (journal_quota)
2465 err = ext3_journal_dirty_metadata(handle, bh);
2466 else {
2467 /* Always do at least ordered writes for quotas */
2468 err = ext3_journal_dirty_data(handle, bh);
2469 mark_buffer_dirty(bh);
2470 }
2471 brelse(bh);
2472 if (err)
2473 goto out;
2474 offset = 0;
2475 towrite -= tocopy;
2476 data += tocopy;
2477 blk++;
2478 }
2479out:
2480 if (len == towrite)
2481 return err;
2482 if (inode->i_size < off+len-towrite) {
2483 i_size_write(inode, off+len-towrite);
2484 EXT3_I(inode)->i_disksize = inode->i_size;
2485 }
2486 inode->i_version++;
2487 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2488 ext3_mark_inode_dirty(handle, inode);
2489 up(&inode->i_sem);
2490 return len - towrite;
2491}
2492
2493#endif
2494
2495static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2496 int flags, const char *dev_name, void *data)
2497{
2498 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2499}
2500
2501static struct file_system_type ext3_fs_type = {
2502 .owner = THIS_MODULE,
2503 .name = "ext3",
2504 .get_sb = ext3_get_sb,
2505 .kill_sb = kill_block_super,
2506 .fs_flags = FS_REQUIRES_DEV,
2507};
2508
2509static int __init init_ext3_fs(void)
2510{
2511 int err = init_ext3_xattr();
2512 if (err)
2513 return err;
2514 err = init_inodecache();
2515 if (err)
2516 goto out1;
2517 err = register_filesystem(&ext3_fs_type);
2518 if (err)
2519 goto out;
2520 return 0;
2521out:
2522 destroy_inodecache();
2523out1:
2524 exit_ext3_xattr();
2525 return err;
2526}
2527
2528static void __exit exit_ext3_fs(void)
2529{
2530 unregister_filesystem(&ext3_fs_type);
2531 destroy_inodecache();
2532 exit_ext3_xattr();
2533}
2534
2535MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2536MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2537MODULE_LICENSE("GPL");
2538module_init(init_ext3_fs)
2539module_exit(exit_ext3_fs)
Clone of davem's net-next-2.6 tree