blob: 726c7ef6cdf129df3bd4da58e791919be7e1aeca [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070031#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070037#include <linux/seq_file.h>
vignesh babu3fc74262007-07-15 23:41:17 -070038#include <linux/log2.h>
Dan Magenheimerd71bc6d2011-05-26 10:01:49 -060039#include <linux/cleancache.h>
Ben Dooks381be252005-10-30 15:02:56 -080040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/uaccess.h>
Ben Dooks381be252005-10-30 15:02:56 -080042
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "xattr.h"
44#include "acl.h"
Ben Dooks381be252005-10-30 15:02:56 -080045#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Lukas Czerner785c4bc2011-05-23 18:33:01 +020047#define CREATE_TRACE_POINTS
48#include <trace/events/ext3.h>
49
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070050#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
51 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
52#else
53 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
54#endif
55
Johann Lombardi71b96252006-01-08 01:03:20 -080056static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
57 unsigned long journal_devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
Eric Sandeeneee194e2006-09-27 01:49:30 -070059 unsigned int);
Takashi Satoc4be0c12009-01-09 16:40:58 -080060static int ext3_commit_super(struct super_block *sb,
61 struct ext3_super_block *es,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 int sync);
63static void ext3_mark_recovery_complete(struct super_block * sb,
64 struct ext3_super_block * es);
65static void ext3_clear_journal_err(struct super_block * sb,
66 struct ext3_super_block * es);
67static int ext3_sync_fs(struct super_block *sb, int wait);
68static const char *ext3_decode_error(struct super_block * sb, int errno,
69 char nbuf[16]);
70static int ext3_remount (struct super_block * sb, int * flags, char * data);
David Howells726c3342006-06-23 02:02:58 -070071static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
Takashi Satoc4be0c12009-01-09 16:40:58 -080072static int ext3_unfreeze(struct super_block *sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -080073static int ext3_freeze(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Mingming Caoae6ddcc2006-09-27 01:49:27 -070075/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 * Wrappers for journal_start/end.
77 *
78 * The only special thing we need to do here is to make sure that all
79 * journal_end calls result in the superblock being marked dirty, so
80 * that sync() will call the filesystem's write_super callback if
Mingming Caoae6ddcc2006-09-27 01:49:27 -070081 * appropriate.
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 */
83handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
84{
85 journal_t *journal;
86
87 if (sb->s_flags & MS_RDONLY)
88 return ERR_PTR(-EROFS);
89
90 /* Special case here: if the journal has aborted behind our
91 * backs (eg. EIO in the commit thread), then we still need to
92 * take the FS itself readonly cleanly. */
93 journal = EXT3_SB(sb)->s_journal;
94 if (is_journal_aborted(journal)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -070095 ext3_abort(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 "Detected aborted journal");
97 return ERR_PTR(-EROFS);
98 }
99
100 return journal_start(journal, nblocks);
101}
102
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700103/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 * The only special thing we need to do here is to make sure that all
105 * journal_stop calls result in the superblock being marked dirty, so
106 * that sync() will call the filesystem's write_super callback if
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700107 * appropriate.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
109int __ext3_journal_stop(const char *where, handle_t *handle)
110{
111 struct super_block *sb;
112 int err;
113 int rc;
114
115 sb = handle->h_transaction->t_journal->j_private;
116 err = handle->h_err;
117 rc = journal_stop(handle);
118
119 if (!err)
120 err = rc;
121 if (err)
122 __ext3_std_error(sb, where, err);
123 return err;
124}
125
126void ext3_journal_abort_handle(const char *caller, const char *err_fn,
127 struct buffer_head *bh, handle_t *handle, int err)
128{
129 char nbuf[16];
130 const char *errstr = ext3_decode_error(NULL, err, nbuf);
131
132 if (bh)
133 BUFFER_TRACE(bh, "abort");
134
135 if (!handle->h_err)
136 handle->h_err = err;
137
138 if (is_handle_aborted(handle))
139 return;
140
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100141 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
142 caller, errstr, err_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 journal_abort_handle(handle);
145}
146
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100147void ext3_msg(struct super_block *sb, const char *prefix,
148 const char *fmt, ...)
149{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800150 struct va_format vaf;
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100151 va_list args;
152
153 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800154
155 vaf.fmt = fmt;
156 vaf.va = &args;
157
158 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
159
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100160 va_end(args);
161}
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163/* Deal with the reporting of failure conditions on a filesystem such as
164 * inconsistencies detected or read IO failures.
165 *
166 * On ext2, we can store the error state of the filesystem in the
167 * superblock. That is not possible on ext3, because we may have other
168 * write ordering constraints on the superblock which prevent us from
169 * writing it out straight away; and given that the journal is about to
170 * be aborted, we can't rely on the current, or future, transactions to
171 * write out the superblock safely.
172 *
173 * We'll just use the journal_abort() error code to record an error in
Thadeu Lima de Souza Cascardod6b198b2010-01-17 19:10:07 -0200174 * the journal instead. On recovery, the journal will complain about
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 * that error until we've noted it down and cleared it.
176 */
177
178static void ext3_handle_error(struct super_block *sb)
179{
180 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
181
182 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
183 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
184
185 if (sb->s_flags & MS_RDONLY)
186 return;
187
Vasily Averin7543fc72006-09-27 01:49:33 -0700188 if (!test_opt (sb, ERRORS_CONT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 journal_t *journal = EXT3_SB(sb)->s_journal;
190
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300191 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (journal)
193 journal_abort(journal, -EIO);
194 }
Vasily Averin7543fc72006-09-27 01:49:33 -0700195 if (test_opt (sb, ERRORS_RO)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100196 ext3_msg(sb, KERN_CRIT,
197 "error: remounting filesystem read-only");
Vasily Averin7543fc72006-09-27 01:49:33 -0700198 sb->s_flags |= MS_RDONLY;
199 }
200 ext3_commit_super(sb, es, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (test_opt(sb, ERRORS_PANIC))
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100202 panic("EXT3-fs (%s): panic forced after error\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 sb->s_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
Joe Perches99fbb1e2010-11-09 10:18:05 -0800206void ext3_error(struct super_block *sb, const char *function,
207 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800209 struct va_format vaf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 va_list args;
211
212 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800213
214 vaf.fmt = fmt;
215 vaf.va = &args;
216
217 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
218 sb->s_id, function, &vaf);
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 va_end(args);
221
222 ext3_handle_error(sb);
223}
224
225static const char *ext3_decode_error(struct super_block * sb, int errno,
226 char nbuf[16])
227{
228 char *errstr = NULL;
229
230 switch (errno) {
231 case -EIO:
232 errstr = "IO failure";
233 break;
234 case -ENOMEM:
235 errstr = "Out of memory";
236 break;
237 case -EROFS:
238 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
239 errstr = "Journal has aborted";
240 else
241 errstr = "Readonly filesystem";
242 break;
243 default:
244 /* If the caller passed in an extra buffer for unknown
245 * errors, textualise them now. Else we just return
246 * NULL. */
247 if (nbuf) {
248 /* Check for truncated error codes... */
249 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
250 errstr = nbuf;
251 }
252 break;
253 }
254
255 return errstr;
256}
257
258/* __ext3_std_error decodes expected errors from journaling functions
259 * automatically and invokes the appropriate error response. */
260
261void __ext3_std_error (struct super_block * sb, const char * function,
262 int errno)
263{
264 char nbuf[16];
Stephen Tweedie30121622005-05-18 11:47:17 -0400265 const char *errstr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Stephen Tweedie30121622005-05-18 11:47:17 -0400267 /* Special case: if the error is EROFS, and we're not already
268 * inside a transaction, then there's really no point in logging
269 * an error. */
270 if (errno == -EROFS && journal_current_handle() == NULL &&
271 (sb->s_flags & MS_RDONLY))
272 return;
273
274 errstr = ext3_decode_error(sb, errno, nbuf);
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100275 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 ext3_handle_error(sb);
278}
279
280/*
281 * ext3_abort is a much stronger failure handler than ext3_error. The
282 * abort function may be used to deal with unrecoverable failures such
283 * as journal IO errors or ENOMEM at a critical moment in log management.
284 *
285 * We unconditionally force the filesystem into an ABORT|READONLY state,
286 * unless the error response on the fs has been set to panic in which
287 * case we take the easy way out and panic immediately.
288 */
289
Joe Perches99fbb1e2010-11-09 10:18:05 -0800290void ext3_abort(struct super_block *sb, const char *function,
291 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800293 struct va_format vaf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 va_list args;
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800297
298 vaf.fmt = fmt;
299 vaf.va = &args;
300
301 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
302 sb->s_id, function, &vaf);
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 va_end(args);
305
306 if (test_opt(sb, ERRORS_PANIC))
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100307 panic("EXT3-fs: panic from previous error\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 if (sb->s_flags & MS_RDONLY)
310 return;
311
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100312 ext3_msg(sb, KERN_CRIT,
313 "error: remounting filesystem read-only");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
315 sb->s_flags |= MS_RDONLY;
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300316 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400317 if (EXT3_SB(sb)->s_journal)
318 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
320
Joe Perches99fbb1e2010-11-09 10:18:05 -0800321void ext3_warning(struct super_block *sb, const char *function,
322 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800324 struct va_format vaf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 va_list args;
326
327 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800328
329 vaf.fmt = fmt;
330 vaf.va = &args;
331
332 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
333 sb->s_id, function, &vaf);
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 va_end(args);
336}
337
338void ext3_update_dynamic_rev(struct super_block *sb)
339{
340 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
341
342 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
343 return;
344
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100345 ext3_msg(sb, KERN_WARNING,
346 "warning: updating to rev %d because of "
347 "new feature flag, running e2fsck is recommended",
348 EXT3_DYNAMIC_REV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
351 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
352 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
353 /* leave es->s_feature_*compat flags alone */
354 /* es->s_uuid will be set by e2fsck if empty */
355
356 /*
357 * The rest of the superblock fields should be zero, and if not it
358 * means they are likely already in use, so leave them alone. We
359 * can leave it up to e2fsck to clean up any inconsistencies there.
360 */
361}
362
363/*
364 * Open the external journal device
365 */
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100366static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
368 struct block_device *bdev;
369 char b[BDEVNAME_SIZE];
370
Tejun Heod4d77622010-11-13 11:55:18 +0100371 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (IS_ERR(bdev))
373 goto fail;
374 return bdev;
375
376fail:
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100377 ext3_msg(sb, "error: failed to open journal device %s: %ld",
378 __bdevname(dev, b), PTR_ERR(bdev));
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return NULL;
381}
382
383/*
384 * Release the journal device
385 */
386static int ext3_blkdev_put(struct block_device *bdev)
387{
Tejun Heoe525fd82010-11-13 11:55:17 +0100388 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389}
390
391static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
392{
393 struct block_device *bdev;
394 int ret = -ENODEV;
395
396 bdev = sbi->journal_bdev;
397 if (bdev) {
398 ret = ext3_blkdev_put(bdev);
399 sbi->journal_bdev = NULL;
400 }
401 return ret;
402}
403
404static inline struct inode *orphan_list_entry(struct list_head *l)
405{
406 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
407}
408
409static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
410{
411 struct list_head *l;
412
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100413 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 le32_to_cpu(sbi->s_es->s_last_orphan));
415
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100416 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 list_for_each(l, &sbi->s_orphan) {
418 struct inode *inode = orphan_list_entry(l);
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100419 ext3_msg(sb, KERN_ERR, " "
Eric Sandeeneee194e2006-09-27 01:49:30 -0700420 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 inode->i_sb->s_id, inode->i_ino, inode,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700422 inode->i_mode, inode->i_nlink,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 NEXT_ORPHAN(inode));
424 }
425}
426
427static void ext3_put_super (struct super_block * sb)
428{
429 struct ext3_sb_info *sbi = EXT3_SB(sb);
430 struct ext3_super_block *es = sbi->s_es;
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400431 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Christoph Hellwige0ccfd92010-05-19 07:16:42 -0400433 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 ext3_xattr_put_super(sb);
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400435 err = journal_destroy(sbi->s_journal);
436 sbi->s_journal = NULL;
437 if (err < 0)
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700438 ext3_abort(sb, __func__, "Couldn't clean up the journal");
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 if (!(sb->s_flags & MS_RDONLY)) {
441 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
442 es->s_state = cpu_to_le16(sbi->s_mount_state);
443 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
444 mark_buffer_dirty(sbi->s_sbh);
445 ext3_commit_super(sb, es, 1);
446 }
447
448 for (i = 0; i < sbi->s_gdb_count; i++)
449 brelse(sbi->s_group_desc[i]);
450 kfree(sbi->s_group_desc);
451 percpu_counter_destroy(&sbi->s_freeblocks_counter);
452 percpu_counter_destroy(&sbi->s_freeinodes_counter);
453 percpu_counter_destroy(&sbi->s_dirs_counter);
454 brelse(sbi->s_sbh);
455#ifdef CONFIG_QUOTA
456 for (i = 0; i < MAXQUOTAS; i++)
457 kfree(sbi->s_qf_names[i]);
458#endif
459
460 /* Debugging code just in case the in-memory inode orphan list
461 * isn't empty. The on-disk one can be non-empty if we've
462 * detected an error and taken the fs readonly, but the
463 * in-memory list had better be clean by this point. */
464 if (!list_empty(&sbi->s_orphan))
465 dump_orphan_list(sb, sbi);
466 J_ASSERT(list_empty(&sbi->s_orphan));
467
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700468 invalidate_bdev(sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
470 /*
471 * Invalidate the journal device's buffers. We don't want them
472 * floating about in memory - the physical journal device may
473 * hotswapped, and it breaks the `ro-after' testing code.
474 */
475 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700476 invalidate_bdev(sbi->journal_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 ext3_blkdev_remove(sbi);
478 }
479 sb->s_fs_info = NULL;
Pekka Enberg5df096d2009-01-07 18:07:25 -0800480 kfree(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 kfree(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482}
483
Christoph Lametere18b8902006-12-06 20:33:20 -0800484static struct kmem_cache *ext3_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486/*
487 * Called inside transaction, so use GFP_NOFS
488 */
489static struct inode *ext3_alloc_inode(struct super_block *sb)
490{
491 struct ext3_inode_info *ei;
492
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800493 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 if (!ei)
495 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 ei->i_block_alloc_info = NULL;
497 ei->vfs_inode.i_version = 1;
Jan Karafe8bc912009-10-16 19:26:15 +0200498 atomic_set(&ei->i_datasync_tid, 0);
499 atomic_set(&ei->i_sync_tid, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 return &ei->vfs_inode;
501}
502
Lukas Czerner785c4bc2011-05-23 18:33:01 +0200503static int ext3_drop_inode(struct inode *inode)
504{
505 int drop = generic_drop_inode(inode);
506
507 trace_ext3_drop_inode(inode, drop);
508 return drop;
509}
510
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100511static void ext3_i_callback(struct rcu_head *head)
512{
513 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100514 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
515}
516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517static void ext3_destroy_inode(struct inode *inode)
518{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700519 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
520 printk("EXT3 Inode %p: orphan list check failed!\n",
521 EXT3_I(inode));
522 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
523 EXT3_I(inode), sizeof(struct ext3_inode_info),
524 false);
525 dump_stack();
526 }
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100527 call_rcu(&inode->i_rcu, ext3_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700530static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531{
532 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
533
Christoph Lametera35afb82007-05-16 22:10:57 -0700534 INIT_LIST_HEAD(&ei->i_orphan);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535#ifdef CONFIG_EXT3_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700536 init_rwsem(&ei->xattr_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537#endif
Christoph Lametera35afb82007-05-16 22:10:57 -0700538 mutex_init(&ei->truncate_mutex);
539 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540}
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542static int init_inodecache(void)
543{
544 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
545 sizeof(struct ext3_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800546 0, (SLAB_RECLAIM_ACCOUNT|
547 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900548 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if (ext3_inode_cachep == NULL)
550 return -ENOMEM;
551 return 0;
552}
553
554static void destroy_inodecache(void)
555{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700556 kmem_cache_destroy(ext3_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200559static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
Mark Bellon8fc27512005-09-06 15:16:54 -0700560{
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200561#if defined(CONFIG_QUOTA)
OGAWA Hirofumi275abf52005-09-22 21:44:03 -0700562 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Jan Kara1aeec432009-11-30 22:22:41 +0100564 if (sbi->s_jquota_fmt) {
565 char *fmtname = "";
566
567 switch (sbi->s_jquota_fmt) {
568 case QFMT_VFS_OLD:
569 fmtname = "vfsold";
570 break;
571 case QFMT_VFS_V0:
572 fmtname = "vfsv0";
573 break;
574 case QFMT_VFS_V1:
575 fmtname = "vfsv1";
576 break;
577 }
578 seq_printf(seq, ",jqfmt=%s", fmtname);
579 }
Mark Bellon8fc27512005-09-06 15:16:54 -0700580
581 if (sbi->s_qf_names[USRQUOTA])
582 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
583
584 if (sbi->s_qf_names[GRPQUOTA])
585 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
586
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300587 if (test_opt(sb, USRQUOTA))
Mark Bellon8fc27512005-09-06 15:16:54 -0700588 seq_puts(seq, ",usrquota");
589
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300590 if (test_opt(sb, GRPQUOTA))
Mark Bellon8fc27512005-09-06 15:16:54 -0700591 seq_puts(seq, ",grpquota");
592#endif
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200593}
594
Jan Kara3c4cec62009-08-24 16:38:43 +0200595static char *data_mode_string(unsigned long mode)
596{
597 switch (mode) {
598 case EXT3_MOUNT_JOURNAL_DATA:
599 return "journal";
600 case EXT3_MOUNT_ORDERED_DATA:
601 return "ordered";
602 case EXT3_MOUNT_WRITEBACK_DATA:
603 return "writeback";
604 }
605 return "unknown";
606}
607
Miklos Szeredi571beed2007-10-16 23:26:26 -0700608/*
609 * Show an option if
610 * - it's set to a non-default value OR
611 * - if the per-sb default is different from the global default
612 */
Al Viro34c80b12011-12-08 21:32:45 -0500613static int ext3_show_options(struct seq_file *seq, struct dentry *root)
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200614{
Al Viro34c80b12011-12-08 21:32:45 -0500615 struct super_block *sb = root->d_sb;
Miklos Szeredi571beed2007-10-16 23:26:26 -0700616 struct ext3_sb_info *sbi = EXT3_SB(sb);
617 struct ext3_super_block *es = sbi->s_es;
618 unsigned long def_mount_opts;
619
620 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
621
622 if (sbi->s_sb_block != 1)
623 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
624 if (test_opt(sb, MINIX_DF))
625 seq_puts(seq, ",minixdf");
626 if (test_opt(sb, GRPID))
627 seq_puts(seq, ",grpid");
628 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
629 seq_puts(seq, ",nogrpid");
630 if (sbi->s_resuid != EXT3_DEF_RESUID ||
631 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
632 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
633 }
634 if (sbi->s_resgid != EXT3_DEF_RESGID ||
635 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
636 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
637 }
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -0800638 if (test_opt(sb, ERRORS_RO)) {
Miklos Szeredi571beed2007-10-16 23:26:26 -0700639 int def_errors = le16_to_cpu(es->s_errors);
640
641 if (def_errors == EXT3_ERRORS_PANIC ||
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -0800642 def_errors == EXT3_ERRORS_CONTINUE) {
643 seq_puts(seq, ",errors=remount-ro");
Miklos Szeredi571beed2007-10-16 23:26:26 -0700644 }
645 }
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -0800646 if (test_opt(sb, ERRORS_CONT))
647 seq_puts(seq, ",errors=continue");
Miklos Szeredi571beed2007-10-16 23:26:26 -0700648 if (test_opt(sb, ERRORS_PANIC))
649 seq_puts(seq, ",errors=panic");
650 if (test_opt(sb, NO_UID32))
651 seq_puts(seq, ",nouid32");
652 if (test_opt(sb, DEBUG))
653 seq_puts(seq, ",debug");
Miklos Szeredi571beed2007-10-16 23:26:26 -0700654#ifdef CONFIG_EXT3_FS_XATTR
655 if (test_opt(sb, XATTR_USER))
656 seq_puts(seq, ",user_xattr");
657 if (!test_opt(sb, XATTR_USER) &&
658 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
659 seq_puts(seq, ",nouser_xattr");
660 }
661#endif
662#ifdef CONFIG_EXT3_FS_POSIX_ACL
663 if (test_opt(sb, POSIX_ACL))
664 seq_puts(seq, ",acl");
665 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
666 seq_puts(seq, ",noacl");
667#endif
668 if (!test_opt(sb, RESERVATION))
669 seq_puts(seq, ",noreservation");
670 if (sbi->s_commit_interval) {
671 seq_printf(seq, ",commit=%u",
672 (unsigned) (sbi->s_commit_interval / HZ));
673 }
Eric Sandeen0636c732010-04-30 11:09:34 -0500674
675 /*
676 * Always display barrier state so it's clear what the status is.
677 */
678 seq_puts(seq, ",barrier=");
679 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300680 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -0700681 if (test_opt(sb, DATA_ERR_ABORT))
682 seq_puts(seq, ",data_err=abort");
683
Eric Sandeendee1d3b2009-11-16 16:50:49 -0600684 if (test_opt(sb, NOLOAD))
685 seq_puts(seq, ",norecovery");
686
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200687 ext3_show_quota_options(seq, sb);
Mark Bellon8fc27512005-09-06 15:16:54 -0700688
689 return 0;
690}
691
NeilBrownfdb36672006-09-16 12:15:38 -0700692
Christoph Hellwig74af0ba2007-10-21 16:42:07 -0700693static struct inode *ext3_nfs_get_inode(struct super_block *sb,
694 u64 ino, u32 generation)
NeilBrownfdb36672006-09-16 12:15:38 -0700695{
NeilBrownfdb36672006-09-16 12:15:38 -0700696 struct inode *inode;
NeilBrownfdb36672006-09-16 12:15:38 -0700697
698 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
699 return ERR_PTR(-ESTALE);
700 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
701 return ERR_PTR(-ESTALE);
702
703 /* iget isn't really right if the inode is currently unallocated!!
704 *
705 * ext3_read_inode will return a bad_inode if the inode had been
706 * deleted, so we should be safe.
707 *
708 * Currently we don't know the generation for parent directory, so
709 * a generation of 0 means "accept any"
710 */
David Howells473043d2008-02-07 00:15:36 -0800711 inode = ext3_iget(sb, ino);
712 if (IS_ERR(inode))
713 return ERR_CAST(inode);
714 if (generation && inode->i_generation != generation) {
NeilBrownfdb36672006-09-16 12:15:38 -0700715 iput(inode);
716 return ERR_PTR(-ESTALE);
717 }
Christoph Hellwig74af0ba2007-10-21 16:42:07 -0700718
719 return inode;
720}
721
722static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
723 int fh_len, int fh_type)
724{
725 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
726 ext3_nfs_get_inode);
727}
728
729static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
730 int fh_len, int fh_type)
731{
732 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
733 ext3_nfs_get_inode);
NeilBrownfdb36672006-09-16 12:15:38 -0700734}
735
Toshiyuki Okajima6b082b52009-01-05 22:38:14 -0500736/*
737 * Try to release metadata pages (indirect blocks, directories) which are
738 * mapped via the block device. Since these pages could have journal heads
739 * which would prevent try_to_free_buffers() from freeing them, we must use
740 * jbd layer's try_to_free_buffers() function to release them.
741 */
742static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
743 gfp_t wait)
744{
745 journal_t *journal = EXT3_SB(sb)->s_journal;
746
747 WARN_ON(PageChecked(page));
748 if (!page_has_buffers(page))
749 return 0;
750 if (journal)
751 return journal_try_to_free_buffers(journal, page,
752 wait & ~__GFP_WAIT);
753 return try_to_free_buffers(page);
754}
755
Mark Bellon8fc27512005-09-06 15:16:54 -0700756#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
758#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760static int ext3_write_dquot(struct dquot *dquot);
761static int ext3_acquire_dquot(struct dquot *dquot);
762static int ext3_release_dquot(struct dquot *dquot);
763static int ext3_mark_dquot_dirty(struct dquot *dquot);
764static int ext3_write_info(struct super_block *sb, int type);
Jan Kara2fd83a42008-04-28 02:14:34 -0700765static int ext3_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +0200766 struct path *path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767static int ext3_quota_on_mount(struct super_block *sb, int type);
768static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
769 size_t len, loff_t off);
770static ssize_t ext3_quota_write(struct super_block *sb, int type,
771 const char *data, size_t len, loff_t off);
772
Alexey Dobriyan61e225d2009-09-21 17:01:08 -0700773static const struct dquot_operations ext3_quota_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 .write_dquot = ext3_write_dquot,
775 .acquire_dquot = ext3_acquire_dquot,
776 .release_dquot = ext3_release_dquot,
777 .mark_dirty = ext3_mark_dquot_dirty,
Jan Kara157091a2008-11-25 15:31:34 +0100778 .write_info = ext3_write_info,
779 .alloc_dquot = dquot_alloc,
780 .destroy_dquot = dquot_destroy,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781};
782
Alexey Dobriyan0d54b212009-09-21 17:01:09 -0700783static const struct quotactl_ops ext3_qctl_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 .quota_on = ext3_quota_on,
Christoph Hellwig287a8092010-05-19 07:16:45 -0400785 .quota_off = dquot_quota_off,
786 .quota_sync = dquot_quota_sync,
787 .get_info = dquot_get_dqinfo,
788 .set_info = dquot_set_dqinfo,
789 .get_dqblk = dquot_get_dqblk,
790 .set_dqblk = dquot_set_dqblk
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791};
792#endif
793
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800794static const struct super_operations ext3_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 .alloc_inode = ext3_alloc_inode,
796 .destroy_inode = ext3_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 .write_inode = ext3_write_inode,
798 .dirty_inode = ext3_dirty_inode,
Lukas Czerner785c4bc2011-05-23 18:33:01 +0200799 .drop_inode = ext3_drop_inode,
Al Viroac14a952010-06-06 07:08:19 -0400800 .evict_inode = ext3_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 .put_super = ext3_put_super,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 .sync_fs = ext3_sync_fs,
Takashi Satoc4be0c12009-01-09 16:40:58 -0800803 .freeze_fs = ext3_freeze,
804 .unfreeze_fs = ext3_unfreeze,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 .statfs = ext3_statfs,
806 .remount_fs = ext3_remount,
Mark Bellon8fc27512005-09-06 15:16:54 -0700807 .show_options = ext3_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808#ifdef CONFIG_QUOTA
809 .quota_read = ext3_quota_read,
810 .quota_write = ext3_quota_write,
811#endif
Toshiyuki Okajima6b082b52009-01-05 22:38:14 -0500812 .bdev_try_to_free_page = bdev_try_to_free_page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813};
814
Christoph Hellwig39655162007-10-21 16:42:17 -0700815static const struct export_operations ext3_export_ops = {
Christoph Hellwig74af0ba2007-10-21 16:42:07 -0700816 .fh_to_dentry = ext3_fh_to_dentry,
817 .fh_to_parent = ext3_fh_to_parent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 .get_parent = ext3_get_parent,
819};
820
821enum {
822 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
823 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Adrian Bunk2860b732005-11-08 21:34:59 -0800824 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Badari Pulavartyade1a292006-06-26 00:25:04 -0700826 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
Johann Lombardi71b96252006-01-08 01:03:20 -0800827 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -0700829 Opt_data_err_abort, Opt_data_err_ignore,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara1aeec432009-11-30 22:22:41 +0100831 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Eric Sandeen0636c732010-04-30 11:09:34 -0500832 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
833 Opt_resize, Opt_usrquota, Opt_grpquota
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834};
835
Steven Whitehousea447c092008-10-13 10:46:57 +0100836static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 {Opt_bsd_df, "bsddf"},
838 {Opt_minix_df, "minixdf"},
839 {Opt_grpid, "grpid"},
840 {Opt_grpid, "bsdgroups"},
841 {Opt_nogrpid, "nogrpid"},
842 {Opt_nogrpid, "sysvgroups"},
843 {Opt_resgid, "resgid=%u"},
844 {Opt_resuid, "resuid=%u"},
845 {Opt_sb, "sb=%u"},
846 {Opt_err_cont, "errors=continue"},
847 {Opt_err_panic, "errors=panic"},
848 {Opt_err_ro, "errors=remount-ro"},
849 {Opt_nouid32, "nouid32"},
850 {Opt_nocheck, "nocheck"},
851 {Opt_nocheck, "check=none"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 {Opt_debug, "debug"},
853 {Opt_oldalloc, "oldalloc"},
854 {Opt_orlov, "orlov"},
855 {Opt_user_xattr, "user_xattr"},
856 {Opt_nouser_xattr, "nouser_xattr"},
857 {Opt_acl, "acl"},
858 {Opt_noacl, "noacl"},
859 {Opt_reservation, "reservation"},
860 {Opt_noreservation, "noreservation"},
861 {Opt_noload, "noload"},
Eric Sandeendee1d3b2009-11-16 16:50:49 -0600862 {Opt_noload, "norecovery"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 {Opt_nobh, "nobh"},
Badari Pulavartyade1a292006-06-26 00:25:04 -0700864 {Opt_bh, "bh"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 {Opt_commit, "commit=%u"},
866 {Opt_journal_update, "journal=update"},
867 {Opt_journal_inum, "journal=%u"},
Johann Lombardi71b96252006-01-08 01:03:20 -0800868 {Opt_journal_dev, "journal_dev=%u"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 {Opt_abort, "abort"},
870 {Opt_data_journal, "data=journal"},
871 {Opt_data_ordered, "data=ordered"},
872 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -0700873 {Opt_data_err_abort, "data_err=abort"},
874 {Opt_data_err_ignore, "data_err=ignore"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 {Opt_offusrjquota, "usrjquota="},
876 {Opt_usrjquota, "usrjquota=%s"},
877 {Opt_offgrpjquota, "grpjquota="},
878 {Opt_grpjquota, "grpjquota=%s"},
879 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
880 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Jan Kara1aeec432009-11-30 22:22:41 +0100881 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700882 {Opt_grpquota, "grpquota"},
Jan Kara1f545872005-06-23 22:01:04 -0700883 {Opt_noquota, "noquota"},
884 {Opt_quota, "quota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700885 {Opt_usrquota, "usrquota"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 {Opt_barrier, "barrier=%u"},
Eric Sandeen0636c732010-04-30 11:09:34 -0500887 {Opt_barrier, "barrier"},
888 {Opt_nobarrier, "nobarrier"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 {Opt_resize, "resize"},
Josef Bacik92587212008-03-04 14:29:43 -0800890 {Opt_err, NULL},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891};
892
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100893static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
Dave Kleikampe9ad5622006-09-27 01:49:35 -0700895 ext3_fsblk_t sb_block;
896 char *options = (char *) *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
898 if (!options || strncmp(options, "sb=", 3) != 0)
899 return 1; /* Default location */
900 options += 3;
Mingming Cao43d23f92006-06-25 05:48:07 -0700901 /*todo: use simple_strtoll with >32bit ext3 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 sb_block = simple_strtoul(options, &options, 0);
903 if (*options && *options != ',') {
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100904 ext3_msg(sb, "error: invalid sb specification: %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 (char *) *data);
906 return 1;
907 }
908 if (*options == ',')
909 options++;
910 *data = (void *) options;
911 return sb_block;
912}
913
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300914#ifdef CONFIG_QUOTA
915static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
916{
917 struct ext3_sb_info *sbi = EXT3_SB(sb);
918 char *qname;
919
920 if (sb_any_quota_loaded(sb) &&
921 !sbi->s_qf_names[qtype]) {
922 ext3_msg(sb, KERN_ERR,
923 "Cannot change journaled "
924 "quota options when quota turned on");
925 return 0;
926 }
927 qname = match_strdup(args);
928 if (!qname) {
929 ext3_msg(sb, KERN_ERR,
930 "Not enough memory for storing quotafile name");
931 return 0;
932 }
933 if (sbi->s_qf_names[qtype] &&
934 strcmp(sbi->s_qf_names[qtype], qname)) {
935 ext3_msg(sb, KERN_ERR,
936 "%s quota file already specified", QTYPE2NAME(qtype));
937 kfree(qname);
938 return 0;
939 }
940 sbi->s_qf_names[qtype] = qname;
941 if (strchr(sbi->s_qf_names[qtype], '/')) {
942 ext3_msg(sb, KERN_ERR,
943 "quotafile must be on filesystem root");
944 kfree(sbi->s_qf_names[qtype]);
945 sbi->s_qf_names[qtype] = NULL;
946 return 0;
947 }
948 set_opt(sbi->s_mount_opt, QUOTA);
949 return 1;
950}
951
952static int clear_qf_name(struct super_block *sb, int qtype) {
953
954 struct ext3_sb_info *sbi = EXT3_SB(sb);
955
956 if (sb_any_quota_loaded(sb) &&
957 sbi->s_qf_names[qtype]) {
958 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
959 " when quota turned on");
960 return 0;
961 }
962 /*
963 * The space will be released later when all options are confirmed
964 * to be correct
965 */
966 sbi->s_qf_names[qtype] = NULL;
967 return 1;
968}
969#endif
970
Johann Lombardi71b96252006-01-08 01:03:20 -0800971static int parse_options (char *options, struct super_block *sb,
Eric Sandeeneee194e2006-09-27 01:49:30 -0700972 unsigned int *inum, unsigned long *journal_devnum,
Mingming Cao43d23f92006-06-25 05:48:07 -0700973 ext3_fsblk_t *n_blocks_count, int is_remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974{
975 struct ext3_sb_info *sbi = EXT3_SB(sb);
976 char * p;
977 substring_t args[MAX_OPT_ARGS];
978 int data_opt = 0;
979 int option;
980#ifdef CONFIG_QUOTA
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300981 int qfmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982#endif
983
984 if (!options)
985 return 1;
986
987 while ((p = strsep (&options, ",")) != NULL) {
988 int token;
989 if (!*p)
990 continue;
Eric Sandeen0636c732010-04-30 11:09:34 -0500991 /*
992 * Initialize args struct so we know whether arg was
993 * found; some options take optional arguments.
994 */
995 args[0].to = args[0].from = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 token = match_token(p, tokens, args);
997 switch (token) {
998 case Opt_bsd_df:
999 clear_opt (sbi->s_mount_opt, MINIX_DF);
1000 break;
1001 case Opt_minix_df:
1002 set_opt (sbi->s_mount_opt, MINIX_DF);
1003 break;
1004 case Opt_grpid:
1005 set_opt (sbi->s_mount_opt, GRPID);
1006 break;
1007 case Opt_nogrpid:
1008 clear_opt (sbi->s_mount_opt, GRPID);
1009 break;
1010 case Opt_resuid:
1011 if (match_int(&args[0], &option))
1012 return 0;
1013 sbi->s_resuid = option;
1014 break;
1015 case Opt_resgid:
1016 if (match_int(&args[0], &option))
1017 return 0;
1018 sbi->s_resgid = option;
1019 break;
1020 case Opt_sb:
1021 /* handled by get_sb_block() instead of here */
1022 /* *sb_block = match_int(&args[0]); */
1023 break;
1024 case Opt_err_panic:
1025 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1026 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1027 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1028 break;
1029 case Opt_err_ro:
1030 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1031 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1032 set_opt (sbi->s_mount_opt, ERRORS_RO);
1033 break;
1034 case Opt_err_cont:
1035 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1036 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1037 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1038 break;
1039 case Opt_nouid32:
1040 set_opt (sbi->s_mount_opt, NO_UID32);
1041 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 case Opt_nocheck:
1043 clear_opt (sbi->s_mount_opt, CHECK);
1044 break;
1045 case Opt_debug:
1046 set_opt (sbi->s_mount_opt, DEBUG);
1047 break;
1048 case Opt_oldalloc:
Lukas Czernerfbc85402011-08-16 18:08:06 +02001049 ext3_msg(sb, KERN_WARNING,
1050 "Ignoring deprecated oldalloc option");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 break;
1052 case Opt_orlov:
Lukas Czernerfbc85402011-08-16 18:08:06 +02001053 ext3_msg(sb, KERN_WARNING,
1054 "Ignoring deprecated orlov option");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 break;
1056#ifdef CONFIG_EXT3_FS_XATTR
1057 case Opt_user_xattr:
1058 set_opt (sbi->s_mount_opt, XATTR_USER);
1059 break;
1060 case Opt_nouser_xattr:
1061 clear_opt (sbi->s_mount_opt, XATTR_USER);
1062 break;
1063#else
1064 case Opt_user_xattr:
1065 case Opt_nouser_xattr:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001066 ext3_msg(sb, KERN_INFO,
1067 "(no)user_xattr options not supported");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 break;
1069#endif
1070#ifdef CONFIG_EXT3_FS_POSIX_ACL
1071 case Opt_acl:
1072 set_opt(sbi->s_mount_opt, POSIX_ACL);
1073 break;
1074 case Opt_noacl:
1075 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1076 break;
1077#else
1078 case Opt_acl:
1079 case Opt_noacl:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001080 ext3_msg(sb, KERN_INFO,
1081 "(no)acl options not supported");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 break;
1083#endif
1084 case Opt_reservation:
1085 set_opt(sbi->s_mount_opt, RESERVATION);
1086 break;
1087 case Opt_noreservation:
1088 clear_opt(sbi->s_mount_opt, RESERVATION);
1089 break;
1090 case Opt_journal_update:
1091 /* @@@ FIXME */
1092 /* Eventually we will want to be able to create
1093 a journal file here. For now, only allow the
1094 user to specify an existing inode to be the
1095 journal file. */
1096 if (is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001097 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1098 "journal on remount");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 return 0;
1100 }
1101 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1102 break;
1103 case Opt_journal_inum:
1104 if (is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001105 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1106 "journal on remount");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 return 0;
1108 }
1109 if (match_int(&args[0], &option))
1110 return 0;
1111 *inum = option;
1112 break;
Johann Lombardi71b96252006-01-08 01:03:20 -08001113 case Opt_journal_dev:
1114 if (is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001115 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1116 "journal on remount");
Johann Lombardi71b96252006-01-08 01:03:20 -08001117 return 0;
1118 }
1119 if (match_int(&args[0], &option))
1120 return 0;
1121 *journal_devnum = option;
1122 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 case Opt_noload:
1124 set_opt (sbi->s_mount_opt, NOLOAD);
1125 break;
1126 case Opt_commit:
1127 if (match_int(&args[0], &option))
1128 return 0;
1129 if (option < 0)
1130 return 0;
1131 if (option == 0)
1132 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1133 sbi->s_commit_interval = HZ * option;
1134 break;
1135 case Opt_data_journal:
1136 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1137 goto datacheck;
1138 case Opt_data_ordered:
1139 data_opt = EXT3_MOUNT_ORDERED_DATA;
1140 goto datacheck;
1141 case Opt_data_writeback:
1142 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1143 datacheck:
1144 if (is_remount) {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001145 if (test_opt(sb, DATA_FLAGS) == data_opt)
Jan Kara3c4cec62009-08-24 16:38:43 +02001146 break;
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001147 ext3_msg(sb, KERN_ERR,
1148 "error: cannot change "
Jan Kara3c4cec62009-08-24 16:38:43 +02001149 "data mode on remount. The filesystem "
1150 "is mounted in data=%s mode and you "
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001151 "try to remount it in data=%s mode.",
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001152 data_mode_string(test_opt(sb,
1153 DATA_FLAGS)),
Jan Kara3c4cec62009-08-24 16:38:43 +02001154 data_mode_string(data_opt));
1155 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 } else {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001157 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 sbi->s_mount_opt |= data_opt;
1159 }
1160 break;
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -07001161 case Opt_data_err_abort:
1162 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1163 break;
1164 case Opt_data_err_ignore:
1165 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1166 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167#ifdef CONFIG_QUOTA
1168 case Opt_usrjquota:
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001169 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1170 return 0;
1171 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 case Opt_grpjquota:
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001173 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 break;
1176 case Opt_offusrjquota:
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001177 if (!clear_qf_name(sb, USRQUOTA))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 return 0;
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001179 break;
1180 case Opt_offgrpjquota:
1181 if (!clear_qf_name(sb, GRPQUOTA))
1182 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 break;
1184 case Opt_jqfmt_vfsold:
Jan Karad06bf1d2008-07-25 01:46:18 -07001185 qfmt = QFMT_VFS_OLD;
1186 goto set_qf_format;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 case Opt_jqfmt_vfsv0:
Jan Karad06bf1d2008-07-25 01:46:18 -07001188 qfmt = QFMT_VFS_V0;
Jan Kara1aeec432009-11-30 22:22:41 +01001189 goto set_qf_format;
1190 case Opt_jqfmt_vfsv1:
1191 qfmt = QFMT_VFS_V1;
Jan Karad06bf1d2008-07-25 01:46:18 -07001192set_qf_format:
Jan Karaee0d5ff2008-08-20 18:11:50 +02001193 if (sb_any_quota_loaded(sb) &&
Jan Karad06bf1d2008-07-25 01:46:18 -07001194 sbi->s_jquota_fmt != qfmt) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001195 ext3_msg(sb, KERN_ERR, "error: cannot change "
Jan Karad06bf1d2008-07-25 01:46:18 -07001196 "journaled quota options when "
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001197 "quota turned on.");
Jan Karad06bf1d2008-07-25 01:46:18 -07001198 return 0;
1199 }
1200 sbi->s_jquota_fmt = qfmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 break;
Jan Kara1f545872005-06-23 22:01:04 -07001202 case Opt_quota:
Mark Bellon8fc27512005-09-06 15:16:54 -07001203 case Opt_usrquota:
Jan Kara1f545872005-06-23 22:01:04 -07001204 set_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -07001205 set_opt(sbi->s_mount_opt, USRQUOTA);
1206 break;
1207 case Opt_grpquota:
1208 set_opt(sbi->s_mount_opt, QUOTA);
1209 set_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -07001210 break;
1211 case Opt_noquota:
Jan Karaee0d5ff2008-08-20 18:11:50 +02001212 if (sb_any_quota_loaded(sb)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001213 ext3_msg(sb, KERN_ERR, "error: cannot change "
1214 "quota options when quota turned on.");
Jan Kara1f545872005-06-23 22:01:04 -07001215 return 0;
1216 }
1217 clear_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -07001218 clear_opt(sbi->s_mount_opt, USRQUOTA);
1219 clear_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -07001220 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221#else
Mark Bellon8fc27512005-09-06 15:16:54 -07001222 case Opt_quota:
1223 case Opt_usrquota:
1224 case Opt_grpquota:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001225 ext3_msg(sb, KERN_ERR,
1226 "error: quota options not supported.");
Jan Karafa1ff1e2008-04-28 02:16:14 -07001227 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 case Opt_usrjquota:
1229 case Opt_grpjquota:
1230 case Opt_offusrjquota:
1231 case Opt_offgrpjquota:
1232 case Opt_jqfmt_vfsold:
1233 case Opt_jqfmt_vfsv0:
Jan Kara1aeec432009-11-30 22:22:41 +01001234 case Opt_jqfmt_vfsv1:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001235 ext3_msg(sb, KERN_ERR,
1236 "error: journaled quota options not "
1237 "supported.");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 break;
Jan Kara1f545872005-06-23 22:01:04 -07001239 case Opt_noquota:
1240 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241#endif
1242 case Opt_abort:
1243 set_opt(sbi->s_mount_opt, ABORT);
1244 break;
Eric Sandeen0636c732010-04-30 11:09:34 -05001245 case Opt_nobarrier:
1246 clear_opt(sbi->s_mount_opt, BARRIER);
1247 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 case Opt_barrier:
Eric Sandeen0636c732010-04-30 11:09:34 -05001249 if (args[0].from) {
1250 if (match_int(&args[0], &option))
1251 return 0;
1252 } else
1253 option = 1; /* No argument, default to 1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 if (option)
1255 set_opt(sbi->s_mount_opt, BARRIER);
1256 else
1257 clear_opt(sbi->s_mount_opt, BARRIER);
1258 break;
1259 case Opt_ignore:
1260 break;
1261 case Opt_resize:
Jan Kara08c6a962005-07-12 13:58:28 -07001262 if (!is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001263 ext3_msg(sb, KERN_ERR,
1264 "error: resize option only available "
1265 "for remount");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 return 0;
1267 }
KAMBAROV, ZAURc7f17212005-06-28 20:45:11 -07001268 if (match_int(&args[0], &option) != 0)
1269 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 *n_blocks_count = option;
1271 break;
1272 case Opt_nobh:
Christoph Hellwig4c4d3902010-06-07 10:20:39 +02001273 ext3_msg(sb, KERN_WARNING,
1274 "warning: ignoring deprecated nobh option");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 break;
Badari Pulavartyade1a292006-06-26 00:25:04 -07001276 case Opt_bh:
Christoph Hellwig4c4d3902010-06-07 10:20:39 +02001277 ext3_msg(sb, KERN_WARNING,
1278 "warning: ignoring deprecated bh option");
Badari Pulavartyade1a292006-06-26 00:25:04 -07001279 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 default:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001281 ext3_msg(sb, KERN_ERR,
1282 "error: unrecognized mount option \"%s\" "
1283 "or missing value", p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 return 0;
1285 }
1286 }
1287#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -07001288 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001289 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
Mark Bellon8fc27512005-09-06 15:16:54 -07001290 clear_opt(sbi->s_mount_opt, USRQUOTA);
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001291 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
Mark Bellon8fc27512005-09-06 15:16:54 -07001292 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1293
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001294 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001295 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1296 "format mixing.");
Mark Bellon8fc27512005-09-06 15:16:54 -07001297 return 0;
1298 }
1299
1300 if (!sbi->s_jquota_fmt) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001301 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1302 "not specified.");
Mark Bellon8fc27512005-09-06 15:16:54 -07001303 return 0;
1304 }
1305 } else {
1306 if (sbi->s_jquota_fmt) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001307 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
Jan Kara99aeaf62008-07-25 01:46:17 -07001308 "specified with no journaling "
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001309 "enabled.");
Mark Bellon8fc27512005-09-06 15:16:54 -07001310 return 0;
1311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 }
1313#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 return 1;
1315}
1316
1317static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1318 int read_only)
1319{
1320 struct ext3_sb_info *sbi = EXT3_SB(sb);
1321 int res = 0;
1322
1323 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001324 ext3_msg(sb, KERN_ERR,
1325 "error: revision level too high, "
1326 "forcing read-only mode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 res = MS_RDONLY;
1328 }
1329 if (read_only)
1330 return res;
1331 if (!(sbi->s_mount_state & EXT3_VALID_FS))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001332 ext3_msg(sb, KERN_WARNING,
1333 "warning: mounting unchecked fs, "
1334 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001336 ext3_msg(sb, KERN_WARNING,
1337 "warning: mounting fs with errors, "
1338 "running e2fsck is recommended");
Namhyung Kimdf0d6b82010-10-10 21:36:59 +09001339 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 le16_to_cpu(es->s_mnt_count) >=
Namhyung Kimdf0d6b82010-10-10 21:36:59 +09001341 le16_to_cpu(es->s_max_mnt_count))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001342 ext3_msg(sb, KERN_WARNING,
1343 "warning: maximal mount count reached, "
1344 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 else if (le32_to_cpu(es->s_checkinterval) &&
1346 (le32_to_cpu(es->s_lastcheck) +
1347 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001348 ext3_msg(sb, KERN_WARNING,
1349 "warning: checktime reached, "
1350 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351#if 0
1352 /* @@@ We _will_ want to clear the valid bit if we find
1353 inconsistencies, to force a fsck at reboot. But for
1354 a plain journaled filesystem we can keep it set as
1355 valid forever! :) */
Marcin Slusarze7f23eb2008-04-28 02:16:06 -07001356 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357#endif
Namhyung Kimdf0d6b82010-10-10 21:36:59 +09001358 if (!le16_to_cpu(es->s_max_mnt_count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
Marcin Slusarz50e8a282008-02-08 04:20:13 -08001360 le16_add_cpu(&es->s_mnt_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 es->s_mtime = cpu_to_le32(get_seconds());
1362 ext3_update_dynamic_rev(sb);
1363 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1364
1365 ext3_commit_super(sb, es, 1);
1366 if (test_opt(sb, DEBUG))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001367 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1368 "bpg=%lu, ipg=%lu, mo=%04lx]",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 sb->s_blocksize,
1370 sbi->s_groups_count,
1371 EXT3_BLOCKS_PER_GROUP(sb),
1372 EXT3_INODES_PER_GROUP(sb),
1373 sbi->s_mount_opt);
1374
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1376 char b[BDEVNAME_SIZE];
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001377 ext3_msg(sb, KERN_INFO, "using external journal on %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1379 } else {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001380 ext3_msg(sb, KERN_INFO, "using internal journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 }
Dan Magenheimerd71bc6d2011-05-26 10:01:49 -06001382 cleancache_init_fs(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 return res;
1384}
1385
1386/* Called at mount-time, super-block is locked */
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001387static int ext3_check_descriptors(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388{
1389 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 int i;
1391
1392 ext3_debug ("Checking group descriptors");
1393
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001394 for (i = 0; i < sbi->s_groups_count; i++) {
1395 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
Akinobu Mita1eaafea2008-04-28 02:16:07 -07001396 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1397 ext3_fsblk_t last_block;
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001398
Eric Sandeen855565e2006-09-27 01:49:29 -07001399 if (i == sbi->s_groups_count - 1)
1400 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1401 else
1402 last_block = first_block +
1403 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1404
Eric Sandeen855565e2006-09-27 01:49:29 -07001405 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1406 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 {
1408 ext3_error (sb, "ext3_check_descriptors",
1409 "Block bitmap for group %d"
1410 " not in group (block %lu)!",
1411 i, (unsigned long)
1412 le32_to_cpu(gdp->bg_block_bitmap));
1413 return 0;
1414 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001415 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1416 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 {
1418 ext3_error (sb, "ext3_check_descriptors",
1419 "Inode bitmap for group %d"
1420 " not in group (block %lu)!",
1421 i, (unsigned long)
1422 le32_to_cpu(gdp->bg_inode_bitmap));
1423 return 0;
1424 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001425 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
Eric Sandeen780dcdb2007-07-26 10:41:11 -07001426 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
Eric Sandeen855565e2006-09-27 01:49:29 -07001427 last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 {
1429 ext3_error (sb, "ext3_check_descriptors",
1430 "Inode table for group %d"
1431 " not in group (block %lu)!",
1432 i, (unsigned long)
1433 le32_to_cpu(gdp->bg_inode_table));
1434 return 0;
1435 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 }
1437
1438 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1439 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1440 return 1;
1441}
1442
1443
1444/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1445 * the superblock) which were deleted from all directories, but held open by
1446 * a process at the time of a crash. We walk the list and try to delete these
1447 * inodes at recovery time (only with a read-write filesystem).
1448 *
1449 * In order to keep the orphan inode chain consistent during traversal (in
1450 * case of crash during recovery), we link each inode into the superblock
1451 * orphan list_head and handle it the same way as an inode deletion during
1452 * normal operation (which journals the operations for us).
1453 *
1454 * We only do an iget() and an iput() on each inode, which is very safe if we
1455 * accidentally point at an in-use or already deleted inode. The worst that
1456 * can happen in this case is that we get a "bit already cleared" message from
1457 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1458 * e2fsck was run on this filesystem, and it must have already done the orphan
1459 * inode cleanup for us, so we can safely abort without any further action.
1460 */
1461static void ext3_orphan_cleanup (struct super_block * sb,
1462 struct ext3_super_block * es)
1463{
1464 unsigned int s_flags = sb->s_flags;
1465 int nr_orphans = 0, nr_truncates = 0;
1466#ifdef CONFIG_QUOTA
1467 int i;
1468#endif
1469 if (!es->s_last_orphan) {
1470 jbd_debug(4, "no orphan inodes to clean up\n");
1471 return;
1472 }
1473
Eric Sandeena8f48a92006-12-06 20:40:13 -08001474 if (bdev_read_only(sb->s_bdev)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001475 ext3_msg(sb, KERN_ERR, "error: write access "
1476 "unavailable, skipping orphan cleanup.");
Eric Sandeena8f48a92006-12-06 20:40:13 -08001477 return;
1478 }
1479
Amir Goldsteince654b32011-02-26 22:40:19 +02001480 /* Check if feature set allows readwrite operations */
1481 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1482 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1483 "unknown ROCOMPAT features");
1484 return;
1485 }
1486
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1488 if (es->s_last_orphan)
1489 jbd_debug(1, "Errors on filesystem, "
1490 "clearing orphan list.\n");
1491 es->s_last_orphan = 0;
1492 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1493 return;
1494 }
1495
1496 if (s_flags & MS_RDONLY) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001497 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 sb->s_flags &= ~MS_RDONLY;
1499 }
1500#ifdef CONFIG_QUOTA
1501 /* Needed for iput() to work correctly and not trash data */
1502 sb->s_flags |= MS_ACTIVE;
1503 /* Turn on quotas so that they are updated correctly */
1504 for (i = 0; i < MAXQUOTAS; i++) {
1505 if (EXT3_SB(sb)->s_qf_names[i]) {
1506 int ret = ext3_quota_on_mount(sb, i);
1507 if (ret < 0)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001508 ext3_msg(sb, KERN_ERR,
1509 "error: cannot turn on journaled "
1510 "quota: %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 }
1512 }
1513#endif
1514
1515 while (es->s_last_orphan) {
1516 struct inode *inode;
1517
David Howells473043d2008-02-07 00:15:36 -08001518 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1519 if (IS_ERR(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 es->s_last_orphan = 0;
1521 break;
1522 }
1523
1524 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
Christoph Hellwig871a2932010-03-03 09:05:07 -05001525 dquot_initialize(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 if (inode->i_nlink) {
1527 printk(KERN_DEBUG
Eric Sandeeneee194e2006-09-27 01:49:30 -07001528 "%s: truncating inode %lu to %Ld bytes\n",
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001529 __func__, inode->i_ino, inode->i_size);
Eric Sandeeneee194e2006-09-27 01:49:30 -07001530 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 inode->i_ino, inode->i_size);
1532 ext3_truncate(inode);
1533 nr_truncates++;
1534 } else {
1535 printk(KERN_DEBUG
Eric Sandeeneee194e2006-09-27 01:49:30 -07001536 "%s: deleting unreferenced inode %lu\n",
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001537 __func__, inode->i_ino);
Eric Sandeeneee194e2006-09-27 01:49:30 -07001538 jbd_debug(2, "deleting unreferenced inode %lu\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 inode->i_ino);
1540 nr_orphans++;
1541 }
1542 iput(inode); /* The delete magic happens here! */
1543 }
1544
1545#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1546
1547 if (nr_orphans)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001548 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1549 PLURAL(nr_orphans));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 if (nr_truncates)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001551 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1552 PLURAL(nr_truncates));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553#ifdef CONFIG_QUOTA
1554 /* Turn quotas off */
1555 for (i = 0; i < MAXQUOTAS; i++) {
1556 if (sb_dqopt(sb)->files[i])
Christoph Hellwig287a8092010-05-19 07:16:45 -04001557 dquot_quota_off(sb, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 }
1559#endif
1560 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1561}
1562
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563/*
1564 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1565 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1566 * We need to be 1 filesystem block less than the 2^32 sector limit.
1567 */
1568static loff_t ext3_max_size(int bits)
1569{
1570 loff_t res = EXT3_NDIR_BLOCKS;
Aneesh Kumar K.Vfe7fdc32008-01-28 23:58:26 -05001571 int meta_blocks;
1572 loff_t upper_limit;
1573
1574 /* This is calculated to be the largest file size for a
1575 * dense, file such that the total number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 * sectors in the file, including data and all indirect blocks,
Aneesh Kumar K.Vfe7fdc32008-01-28 23:58:26 -05001577 * does not exceed 2^32 -1
1578 * __u32 i_blocks representing the total number of
1579 * 512 bytes blocks of the file
1580 */
1581 upper_limit = (1LL << 32) - 1;
1582
1583 /* total blocks in file system block size */
1584 upper_limit >>= (bits - 9);
1585
1586
1587 /* indirect blocks */
1588 meta_blocks = 1;
1589 /* double indirect blocks */
1590 meta_blocks += 1 + (1LL << (bits-2));
1591 /* tripple indirect blocks */
1592 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1593
1594 upper_limit -= meta_blocks;
1595 upper_limit <<= bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596
1597 res += 1LL << (bits-2);
1598 res += 1LL << (2*(bits-2));
1599 res += 1LL << (3*(bits-2));
1600 res <<= bits;
1601 if (res > upper_limit)
1602 res = upper_limit;
Aneesh Kumar K.Vfe7fdc32008-01-28 23:58:26 -05001603
1604 if (res > MAX_LFS_FILESIZE)
1605 res = MAX_LFS_FILESIZE;
1606
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 return res;
1608}
1609
Mingming Cao43d23f92006-06-25 05:48:07 -07001610static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1611 ext3_fsblk_t logic_sb_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 int nr)
1613{
1614 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001615 unsigned long bg, first_meta_bg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 int has_super = 0;
1617
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1619
1620 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1621 nr < first_meta_bg)
1622 return (logic_sb_block + nr + 1);
1623 bg = sbi->s_desc_per_block * nr;
1624 if (ext3_bg_has_super(sb, bg))
1625 has_super = 1;
Mingming Cao43d23f92006-06-25 05:48:07 -07001626 return (has_super + ext3_group_first_block_no(sb, bg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627}
1628
1629
1630static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1631{
1632 struct buffer_head * bh;
1633 struct ext3_super_block *es = NULL;
1634 struct ext3_sb_info *sbi;
Mingming Cao43d23f92006-06-25 05:48:07 -07001635 ext3_fsblk_t block;
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001636 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001637 ext3_fsblk_t logic_sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 unsigned long offset = 0;
Eric Sandeeneee194e2006-09-27 01:49:30 -07001639 unsigned int journal_inum = 0;
Johann Lombardi71b96252006-01-08 01:03:20 -08001640 unsigned long journal_devnum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 unsigned long def_mount_opts;
1642 struct inode *root;
1643 int blocksize;
1644 int hblock;
1645 int db_count;
1646 int i;
1647 int needs_recovery;
David Howells473043d2008-02-07 00:15:36 -08001648 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 __le32 features;
Peter Zijlstra833f4072007-10-16 23:25:45 -07001650 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -07001652 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 if (!sbi)
1654 return -ENOMEM;
Pekka Enberg5df096d2009-01-07 18:07:25 -08001655
1656 sbi->s_blockgroup_lock =
1657 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1658 if (!sbi->s_blockgroup_lock) {
1659 kfree(sbi);
1660 return -ENOMEM;
1661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 sb->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 sbi->s_mount_opt = 0;
1664 sbi->s_resuid = EXT3_DEF_RESUID;
1665 sbi->s_resgid = EXT3_DEF_RESGID;
Miklos Szeredi571beed2007-10-16 23:26:26 -07001666 sbi->s_sb_block = sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1669 if (!blocksize) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001670 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 goto out_fail;
1672 }
1673
1674 /*
1675 * The ext3 superblock will not be buffer aligned for other than 1kB
1676 * block sizes. We need to calculate the offset from buffer start.
1677 */
1678 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1679 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1680 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1681 } else {
1682 logic_sb_block = sb_block;
1683 }
1684
1685 if (!(bh = sb_bread(sb, logic_sb_block))) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001686 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 goto out_fail;
1688 }
1689 /*
1690 * Note: s_es must be initialized as soon as possible because
1691 * some ext3 macro-instructions depend on its value
1692 */
Namhyung Kim57e94d82010-10-11 02:10:45 +09001693 es = (struct ext3_super_block *) (bh->b_data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 sbi->s_es = es;
1695 sb->s_magic = le16_to_cpu(es->s_magic);
1696 if (sb->s_magic != EXT3_SUPER_MAGIC)
1697 goto cantfind_ext3;
1698
1699 /* Set defaults before we parse the mount options */
1700 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1701 if (def_mount_opts & EXT3_DEFM_DEBUG)
1702 set_opt(sbi->s_mount_opt, DEBUG);
1703 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1704 set_opt(sbi->s_mount_opt, GRPID);
1705 if (def_mount_opts & EXT3_DEFM_UID16)
1706 set_opt(sbi->s_mount_opt, NO_UID32);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001707#ifdef CONFIG_EXT3_FS_XATTR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1709 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001710#endif
1711#ifdef CONFIG_EXT3_FS_POSIX_ACL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 if (def_mount_opts & EXT3_DEFM_ACL)
1713 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001714#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001716 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001718 set_opt(sbi->s_mount_opt, ORDERED_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001720 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
1722 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1723 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -08001724 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
Dmitry Mishin2245d7c2006-10-11 01:21:49 -07001725 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -08001726 else
1727 set_opt(sbi->s_mount_opt, ERRORS_RO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728
1729 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1730 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1731
Christoph Hellwig00eacd62011-07-16 16:46:50 -04001732 /* enable barriers by default */
1733 set_opt(sbi->s_mount_opt, BARRIER);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 set_opt(sbi->s_mount_opt, RESERVATION);
1735
Johann Lombardi71b96252006-01-08 01:03:20 -08001736 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1737 NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 goto failed_mount;
1739
1740 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001741 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742
1743 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1744 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1745 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1746 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001747 ext3_msg(sb, KERN_WARNING,
1748 "warning: feature flags set on rev 0 fs, "
1749 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 /*
1751 * Check feature flags regardless of the revision level, since we
1752 * previously didn't change the revision level when setting the flags,
1753 * so there is a chance incompat flags are set on a rev 0 filesystem.
1754 */
1755 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1756 if (features) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001757 ext3_msg(sb, KERN_ERR,
1758 "error: couldn't mount because of unsupported "
1759 "optional features (%x)", le32_to_cpu(features));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 goto failed_mount;
1761 }
1762 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1763 if (!(sb->s_flags & MS_RDONLY) && features) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001764 ext3_msg(sb, KERN_ERR,
1765 "error: couldn't mount RDWR because of unsupported "
1766 "optional features (%x)", le32_to_cpu(features));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 goto failed_mount;
1768 }
1769 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1770
1771 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1772 blocksize > EXT3_MAX_BLOCK_SIZE) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001773 ext3_msg(sb, KERN_ERR,
1774 "error: couldn't mount because of unsupported "
1775 "filesystem blocksize %d", blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 goto failed_mount;
1777 }
1778
Martin K. Petersene1defc42009-05-22 17:17:49 -04001779 hblock = bdev_logical_block_size(sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 if (sb->s_blocksize != blocksize) {
1781 /*
1782 * Make sure the blocksize for the filesystem is larger
1783 * than the hardware sectorsize for the machine.
1784 */
1785 if (blocksize < hblock) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001786 ext3_msg(sb, KERN_ERR,
1787 "error: fsblocksize %d too small for "
1788 "hardware sectorsize %d", blocksize, hblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 goto failed_mount;
1790 }
1791
1792 brelse (bh);
Takashi Sato0f0a89e2007-10-18 03:06:56 -07001793 if (!sb_set_blocksize(sb, blocksize)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001794 ext3_msg(sb, KERN_ERR,
1795 "error: bad blocksize %d", blocksize);
Takashi Sato0f0a89e2007-10-18 03:06:56 -07001796 goto out_fail;
1797 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1799 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1800 bh = sb_bread(sb, logic_sb_block);
1801 if (!bh) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001802 ext3_msg(sb, KERN_ERR,
1803 "error: can't read superblock on 2nd try");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 goto failed_mount;
1805 }
Namhyung Kim57e94d82010-10-11 02:10:45 +09001806 es = (struct ext3_super_block *)(bh->b_data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 sbi->s_es = es;
1808 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001809 ext3_msg(sb, KERN_ERR,
1810 "error: magic mismatch");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 goto failed_mount;
1812 }
1813 }
1814
1815 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1816
1817 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1818 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1819 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1820 } else {
1821 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1822 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1823 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
vignesh babu3fc74262007-07-15 23:41:17 -07001824 (!is_power_of_2(sbi->s_inode_size)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 (sbi->s_inode_size > blocksize)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001826 ext3_msg(sb, KERN_ERR,
1827 "error: unsupported inode size: %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 sbi->s_inode_size);
1829 goto failed_mount;
1830 }
1831 }
1832 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1833 le32_to_cpu(es->s_log_frag_size);
1834 if (blocksize != sbi->s_frag_size) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001835 ext3_msg(sb, KERN_ERR,
1836 "error: fragsize %lu != blocksize %u (unsupported)",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 sbi->s_frag_size, blocksize);
1838 goto failed_mount;
1839 }
1840 sbi->s_frags_per_block = 1;
1841 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1842 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1843 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andries E. Brouwerb47b6f32007-12-17 16:19:55 -08001844 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845 goto cantfind_ext3;
1846 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1847 if (sbi->s_inodes_per_block == 0)
1848 goto cantfind_ext3;
1849 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1850 sbi->s_inodes_per_block;
1851 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1852 sbi->s_sbh = bh;
1853 sbi->s_mount_state = le16_to_cpu(es->s_state);
David Howellsf0d1b0b2006-12-08 02:37:49 -08001854 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1855 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 for (i=0; i < 4; i++)
1857 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1858 sbi->s_def_hash_version = es->s_def_hash_version;
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -04001859 i = le32_to_cpu(es->s_flags);
1860 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1861 sbi->s_hash_unsigned = 3;
1862 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1863#ifdef __CHAR_UNSIGNED__
1864 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1865 sbi->s_hash_unsigned = 3;
1866#else
1867 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1868#endif
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -04001869 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870
1871 if (sbi->s_blocks_per_group > blocksize * 8) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001872 ext3_msg(sb, KERN_ERR,
1873 "#blocks per group too big: %lu",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 sbi->s_blocks_per_group);
1875 goto failed_mount;
1876 }
1877 if (sbi->s_frags_per_group > blocksize * 8) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001878 ext3_msg(sb, KERN_ERR,
1879 "error: #fragments per group too big: %lu",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 sbi->s_frags_per_group);
1881 goto failed_mount;
1882 }
1883 if (sbi->s_inodes_per_group > blocksize * 8) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001884 ext3_msg(sb, KERN_ERR,
1885 "error: #inodes per group too big: %lu",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 sbi->s_inodes_per_group);
1887 goto failed_mount;
1888 }
1889
Darrick J. Wongad692bf2010-11-16 22:57:44 +00001890 err = generic_check_addressable(sb->s_blocksize_bits,
1891 le32_to_cpu(es->s_blocks_count));
1892 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001893 ext3_msg(sb, KERN_ERR,
1894 "error: filesystem is too large to mount safely");
Mingming Caofcd5df32006-06-25 05:47:50 -07001895 if (sizeof(sector_t) < 8)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001896 ext3_msg(sb, KERN_ERR,
1897 "error: CONFIG_LBDAF not enabled");
Darrick J. Wongad692bf2010-11-16 22:57:44 +00001898 ret = err;
Mingming Caofcd5df32006-06-25 05:47:50 -07001899 goto failed_mount;
1900 }
1901
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1903 goto cantfind_ext3;
Eric Sandeen855565e2006-09-27 01:49:29 -07001904 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1905 le32_to_cpu(es->s_first_data_block) - 1)
1906 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
Namhyung Kim81a4e322010-10-11 19:38:39 +09001907 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1909 GFP_KERNEL);
1910 if (sbi->s_group_desc == NULL) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001911 ext3_msg(sb, KERN_ERR,
1912 "error: not enough memory");
Namhyung Kim4569cd12010-10-11 19:08:06 +09001913 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 goto failed_mount;
1915 }
1916
Pekka Enberg5df096d2009-01-07 18:07:25 -08001917 bgl_lock_init(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918
1919 for (i = 0; i < db_count; i++) {
1920 block = descriptor_loc(sb, logic_sb_block, i);
1921 sbi->s_group_desc[i] = sb_bread(sb, block);
1922 if (!sbi->s_group_desc[i]) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001923 ext3_msg(sb, KERN_ERR,
1924 "error: can't read group descriptor %d", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 db_count = i;
1926 goto failed_mount2;
1927 }
1928 }
1929 if (!ext3_check_descriptors (sb)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001930 ext3_msg(sb, KERN_ERR,
1931 "error: group descriptors corrupted");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 goto failed_mount2;
1933 }
1934 sbi->s_gdb_count = db_count;
1935 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1936 spin_lock_init(&sbi->s_next_gen_lock);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001937
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 /* per fileystem reservation list head & lock */
1939 spin_lock_init(&sbi->s_rsv_window_lock);
1940 sbi->s_rsv_window_root = RB_ROOT;
1941 /* Add a single, static dummy reservation to the start of the
1942 * reservation window list --- it gives us a placeholder for
1943 * append-at-start-of-list which makes the allocation logic
1944 * _much_ simpler. */
1945 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1946 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1948 sbi->s_rsv_window_head.rsv_goal_size = 0;
1949 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1950
1951 /*
1952 * set up enough so that it can read an inode
1953 */
1954 sb->s_op = &ext3_sops;
1955 sb->s_export_op = &ext3_export_ops;
1956 sb->s_xattr = ext3_xattr_handlers;
1957#ifdef CONFIG_QUOTA
1958 sb->s_qcop = &ext3_qctl_operations;
1959 sb->dq_op = &ext3_quota_operations;
1960#endif
Aneesh Kumar K.V03cb5f02011-01-29 18:43:39 +05301961 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
Eric Sandeenb8a052d2009-12-14 13:00:30 -06001963 mutex_init(&sbi->s_orphan_lock);
Eric Sandeen96d2a492009-12-14 13:01:05 -06001964 mutex_init(&sbi->s_resize_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965
1966 sb->s_root = NULL;
1967
1968 needs_recovery = (es->s_last_orphan != 0 ||
1969 EXT3_HAS_INCOMPAT_FEATURE(sb,
1970 EXT3_FEATURE_INCOMPAT_RECOVER));
1971
1972 /*
1973 * The first inode we look at is the journal inode. Don't try
1974 * root first: it may be modified in the journal!
1975 */
1976 if (!test_opt(sb, NOLOAD) &&
1977 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
Johann Lombardi71b96252006-01-08 01:03:20 -08001978 if (ext3_load_journal(sb, es, journal_devnum))
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04001979 goto failed_mount2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 } else if (journal_inum) {
1981 if (ext3_create_journal(sb, es, journal_inum))
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04001982 goto failed_mount2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 } else {
1984 if (!silent)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001985 ext3_msg(sb, KERN_ERR,
1986 "error: no journal found. "
1987 "mounting ext3 over ext2?");
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04001988 goto failed_mount2;
1989 }
1990 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1991 ext3_count_free_blocks(sb));
1992 if (!err) {
1993 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1994 ext3_count_free_inodes(sb));
1995 }
1996 if (!err) {
1997 err = percpu_counter_init(&sbi->s_dirs_counter,
1998 ext3_count_dirs(sb));
1999 }
2000 if (err) {
2001 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
Namhyung Kim4569cd12010-10-11 19:08:06 +09002002 ret = err;
Mingming Cao0216bfc2006-06-23 02:05:41 -07002003 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 }
2005
2006 /* We have now updated the journal if required, so we can
2007 * validate the data journaling mode. */
2008 switch (test_opt(sb, DATA_FLAGS)) {
2009 case 0:
2010 /* No mode set, assume a default based on the journal
2011 capabilities: ORDERED_DATA if the journal can
2012 cope, else JOURNAL_DATA */
2013 if (journal_check_available_features
2014 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -07002015 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 else
2017 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2018 break;
2019
2020 case EXT3_MOUNT_ORDERED_DATA:
2021 case EXT3_MOUNT_WRITEBACK_DATA:
2022 if (!journal_check_available_features
2023 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002024 ext3_msg(sb, KERN_ERR,
2025 "error: journal does not support "
2026 "requested data journaling mode");
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002027 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 }
2029 default:
2030 break;
2031 }
2032
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 /*
2034 * The journal_load will have done any necessary log recovery,
2035 * so we can safely mount the rest of the filesystem now.
2036 */
2037
David Howells473043d2008-02-07 00:15:36 -08002038 root = ext3_iget(sb, EXT3_ROOT_INO);
2039 if (IS_ERR(root)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002040 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
David Howells473043d2008-02-07 00:15:36 -08002041 ret = PTR_ERR(root);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002042 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 }
2044 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
David Howells473043d2008-02-07 00:15:36 -08002045 iput(root);
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002046 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002047 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 }
David Howells473043d2008-02-07 00:15:36 -08002049 sb->s_root = d_alloc_root(root);
2050 if (!sb->s_root) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002051 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
David Howells473043d2008-02-07 00:15:36 -08002052 iput(root);
2053 ret = -ENOMEM;
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002054 goto failed_mount3;
David Howells473043d2008-02-07 00:15:36 -08002055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
2057 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
Eric Sandeened505ee2009-12-14 12:59:18 -06002058
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2060 ext3_orphan_cleanup(sb, es);
2061 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
Eryu Guan63894ab2011-11-01 10:06:19 +08002062 if (needs_recovery) {
2063 ext3_mark_recovery_complete(sb, es);
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002064 ext3_msg(sb, KERN_INFO, "recovery complete");
Eryu Guan63894ab2011-11-01 10:06:19 +08002065 }
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002066 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2068 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2069 "writeback");
2070
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 return 0;
2072
2073cantfind_ext3:
2074 if (!silent)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002075 ext3_msg(sb, KERN_INFO,
2076 "error: can't find ext3 filesystem on dev %s.",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077 sb->s_id);
2078 goto failed_mount;
2079
Mingming Cao0216bfc2006-06-23 02:05:41 -07002080failed_mount3:
2081 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2082 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2083 percpu_counter_destroy(&sbi->s_dirs_counter);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002084 journal_destroy(sbi->s_journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085failed_mount2:
2086 for (i = 0; i < db_count; i++)
2087 brelse(sbi->s_group_desc[i]);
2088 kfree(sbi->s_group_desc);
2089failed_mount:
2090#ifdef CONFIG_QUOTA
2091 for (i = 0; i < MAXQUOTAS; i++)
2092 kfree(sbi->s_qf_names[i]);
2093#endif
2094 ext3_blkdev_remove(sbi);
2095 brelse(bh);
2096out_fail:
2097 sb->s_fs_info = NULL;
Manish Katiyarde5ce032009-05-17 23:52:47 -04002098 kfree(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 kfree(sbi);
David Howells473043d2008-02-07 00:15:36 -08002100 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101}
2102
2103/*
2104 * Setup any per-fs journal parameters now. We'll do this both on
2105 * initial mount, once the journal has been initialised but before we've
Mingming Caoae6ddcc2006-09-27 01:49:27 -07002106 * done any recovery; and again on any subsequent remount.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 */
2108static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2109{
2110 struct ext3_sb_info *sbi = EXT3_SB(sb);
2111
2112 if (sbi->s_commit_interval)
2113 journal->j_commit_interval = sbi->s_commit_interval;
2114 /* We could also set up an ext3-specific default for the commit
2115 * interval here, but for now we'll just fall back to the jbd
2116 * default. */
2117
2118 spin_lock(&journal->j_state_lock);
2119 if (test_opt(sb, BARRIER))
2120 journal->j_flags |= JFS_BARRIER;
2121 else
2122 journal->j_flags &= ~JFS_BARRIER;
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -07002123 if (test_opt(sb, DATA_ERR_ABORT))
2124 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2125 else
2126 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127 spin_unlock(&journal->j_state_lock);
2128}
2129
Eric Sandeeneee194e2006-09-27 01:49:30 -07002130static journal_t *ext3_get_journal(struct super_block *sb,
2131 unsigned int journal_inum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132{
2133 struct inode *journal_inode;
2134 journal_t *journal;
2135
2136 /* First, test for the existence of a valid inode on disk. Bad
2137 * things happen if we iget() an unused inode, as the subsequent
2138 * iput() will try to delete it. */
2139
David Howells473043d2008-02-07 00:15:36 -08002140 journal_inode = ext3_iget(sb, journal_inum);
2141 if (IS_ERR(journal_inode)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002142 ext3_msg(sb, KERN_ERR, "error: no journal found");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143 return NULL;
2144 }
2145 if (!journal_inode->i_nlink) {
2146 make_bad_inode(journal_inode);
2147 iput(journal_inode);
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002148 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 return NULL;
2150 }
2151
2152 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2153 journal_inode, journal_inode->i_size);
David Howells473043d2008-02-07 00:15:36 -08002154 if (!S_ISREG(journal_inode->i_mode)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002155 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156 iput(journal_inode);
2157 return NULL;
2158 }
2159
2160 journal = journal_init_inode(journal_inode);
2161 if (!journal) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002162 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163 iput(journal_inode);
2164 return NULL;
2165 }
2166 journal->j_private = sb;
2167 ext3_init_journal_params(sb, journal);
2168 return journal;
2169}
2170
2171static journal_t *ext3_get_dev_journal(struct super_block *sb,
2172 dev_t j_dev)
2173{
2174 struct buffer_head * bh;
2175 journal_t *journal;
Mingming Cao43d23f92006-06-25 05:48:07 -07002176 ext3_fsblk_t start;
Mingming Cao1c2bf372006-06-25 05:48:06 -07002177 ext3_fsblk_t len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178 int hblock, blocksize;
Mingming Cao43d23f92006-06-25 05:48:07 -07002179 ext3_fsblk_t sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 unsigned long offset;
2181 struct ext3_super_block * es;
2182 struct block_device *bdev;
2183
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002184 bdev = ext3_blkdev_get(j_dev, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185 if (bdev == NULL)
2186 return NULL;
2187
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188 blocksize = sb->s_blocksize;
Martin K. Petersene1defc42009-05-22 17:17:49 -04002189 hblock = bdev_logical_block_size(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190 if (blocksize < hblock) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002191 ext3_msg(sb, KERN_ERR,
2192 "error: blocksize too small for journal device");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193 goto out_bdev;
2194 }
2195
2196 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2197 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2198 set_blocksize(bdev, blocksize);
2199 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002200 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2201 "external journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 goto out_bdev;
2203 }
2204
Namhyung Kim57e94d82010-10-11 02:10:45 +09002205 es = (struct ext3_super_block *) (bh->b_data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2207 !(le32_to_cpu(es->s_feature_incompat) &
2208 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002209 ext3_msg(sb, KERN_ERR, "error: external journal has "
2210 "bad superblock");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211 brelse(bh);
2212 goto out_bdev;
2213 }
2214
2215 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002216 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 brelse(bh);
2218 goto out_bdev;
2219 }
2220
2221 len = le32_to_cpu(es->s_blocks_count);
2222 start = sb_block + 1;
2223 brelse(bh); /* we're done with the superblock */
2224
2225 journal = journal_init_dev(bdev, sb->s_bdev,
2226 start, len, blocksize);
2227 if (!journal) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002228 ext3_msg(sb, KERN_ERR,
2229 "error: failed to create device journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230 goto out_bdev;
2231 }
2232 journal->j_private = sb;
Zheng Liud03e1292011-12-05 15:55:11 +08002233 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2234 if (bh_submit_read(journal->j_sb_buffer)) {
2235 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2236 goto out_journal;
2237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 }
2239 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002240 ext3_msg(sb, KERN_ERR,
2241 "error: external journal has more than one "
2242 "user (unsupported) - %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243 be32_to_cpu(journal->j_superblock->s_nr_users));
2244 goto out_journal;
2245 }
2246 EXT3_SB(sb)->journal_bdev = bdev;
2247 ext3_init_journal_params(sb, journal);
2248 return journal;
2249out_journal:
2250 journal_destroy(journal);
2251out_bdev:
2252 ext3_blkdev_put(bdev);
2253 return NULL;
2254}
2255
Johann Lombardi71b96252006-01-08 01:03:20 -08002256static int ext3_load_journal(struct super_block *sb,
2257 struct ext3_super_block *es,
2258 unsigned long journal_devnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259{
2260 journal_t *journal;
Eric Sandeeneee194e2006-09-27 01:49:30 -07002261 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
Johann Lombardi71b96252006-01-08 01:03:20 -08002262 dev_t journal_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263 int err = 0;
2264 int really_read_only;
2265
Johann Lombardi71b96252006-01-08 01:03:20 -08002266 if (journal_devnum &&
2267 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002268 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2269 "numbers have changed");
Johann Lombardi71b96252006-01-08 01:03:20 -08002270 journal_dev = new_decode_dev(journal_devnum);
2271 } else
2272 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2273
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274 really_read_only = bdev_read_only(sb->s_bdev);
2275
2276 /*
2277 * Are we loading a blank journal or performing recovery after a
2278 * crash? For recovery, we need to check in advance whether we
2279 * can get read-write access to the device.
2280 */
2281
2282 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2283 if (sb->s_flags & MS_RDONLY) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002284 ext3_msg(sb, KERN_INFO,
2285 "recovery required on readonly filesystem");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286 if (really_read_only) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002287 ext3_msg(sb, KERN_ERR, "error: write access "
2288 "unavailable, cannot proceed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289 return -EROFS;
2290 }
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002291 ext3_msg(sb, KERN_INFO,
2292 "write access will be enabled during recovery");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293 }
2294 }
2295
2296 if (journal_inum && journal_dev) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002297 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2298 "and inode journals");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 return -EINVAL;
2300 }
2301
2302 if (journal_inum) {
2303 if (!(journal = ext3_get_journal(sb, journal_inum)))
2304 return -EINVAL;
2305 } else {
2306 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2307 return -EINVAL;
2308 }
2309
Eric Sandeen0636c732010-04-30 11:09:34 -05002310 if (!(journal->j_flags & JFS_BARRIER))
2311 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2312
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2314 err = journal_update_format(journal);
2315 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002316 ext3_msg(sb, KERN_ERR, "error updating journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317 journal_destroy(journal);
2318 return err;
2319 }
2320 }
2321
2322 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2323 err = journal_wipe(journal, !really_read_only);
2324 if (!err)
2325 err = journal_load(journal);
2326
2327 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002328 ext3_msg(sb, KERN_ERR, "error loading journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 journal_destroy(journal);
2330 return err;
2331 }
2332
2333 EXT3_SB(sb)->s_journal = journal;
2334 ext3_clear_journal_err(sb, es);
Johann Lombardi71b96252006-01-08 01:03:20 -08002335
Maciej Żenczykowski31d710a2010-09-26 12:38:28 +00002336 if (!really_read_only && journal_devnum &&
Johann Lombardi71b96252006-01-08 01:03:20 -08002337 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2338 es->s_journal_dev = cpu_to_le32(journal_devnum);
Johann Lombardi71b96252006-01-08 01:03:20 -08002339
2340 /* Make sure we flush the recovery flag to disk. */
2341 ext3_commit_super(sb, es, 1);
2342 }
2343
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344 return 0;
2345}
2346
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002347static int ext3_create_journal(struct super_block *sb,
2348 struct ext3_super_block *es,
Eric Sandeeneee194e2006-09-27 01:49:30 -07002349 unsigned int journal_inum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350{
2351 journal_t *journal;
Borislav Petkov952d9de2007-07-15 23:41:45 -07002352 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353
2354 if (sb->s_flags & MS_RDONLY) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002355 ext3_msg(sb, KERN_ERR,
2356 "error: readonly filesystem when trying to "
2357 "create journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 return -EROFS;
2359 }
2360
Borislav Petkov952d9de2007-07-15 23:41:45 -07002361 journal = ext3_get_journal(sb, journal_inum);
2362 if (!journal)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 return -EINVAL;
2364
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002365 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366 journal_inum);
2367
Borislav Petkov952d9de2007-07-15 23:41:45 -07002368 err = journal_create(journal);
2369 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002370 ext3_msg(sb, KERN_ERR, "error creating journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 journal_destroy(journal);
2372 return -EIO;
2373 }
2374
2375 EXT3_SB(sb)->s_journal = journal;
2376
2377 ext3_update_dynamic_rev(sb);
2378 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2379 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2380
2381 es->s_journal_inum = cpu_to_le32(journal_inum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382
2383 /* Make sure we flush the recovery flag to disk. */
2384 ext3_commit_super(sb, es, 1);
2385
2386 return 0;
2387}
2388
Takashi Satoc4be0c12009-01-09 16:40:58 -08002389static int ext3_commit_super(struct super_block *sb,
2390 struct ext3_super_block *es,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391 int sync)
2392{
2393 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
Takashi Satoc4be0c12009-01-09 16:40:58 -08002394 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395
2396 if (!sbh)
Takashi Satoc4be0c12009-01-09 16:40:58 -08002397 return error;
Darrick J. Wongdff68252010-10-04 12:35:05 -07002398
2399 if (buffer_write_io_error(sbh)) {
2400 /*
2401 * Oh, dear. A previous attempt to write the
2402 * superblock failed. This could happen because the
2403 * USB device was yanked out. Or it could happen to
2404 * be a transient write error and maybe the block will
2405 * be remapped. Nothing we can do but to retry the
2406 * write and hope for the best.
2407 */
2408 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2409 "superblock detected");
2410 clear_buffer_write_io_error(sbh);
2411 set_buffer_uptodate(sbh);
2412 }
Theodore Ts'o96ec2e02009-09-16 11:21:13 -04002413 /*
2414 * If the file system is mounted read-only, don't update the
2415 * superblock write time. This avoids updating the superblock
2416 * write time when we are mounting the root file system
2417 * read/only but we need to replay the journal; at that point,
2418 * for people who are east of GMT and who make their clock
2419 * tick in localtime for Windows bug-for-bug compatibility,
2420 * the clock is set in the future, and this will cause e2fsck
2421 * to complain and force a full file system check.
2422 */
2423 if (!(sb->s_flags & MS_RDONLY))
2424 es->s_wtime = cpu_to_le32(get_seconds());
Linus Torvalds1da177e2005-04-16 15:20:36 -07002425 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2426 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2427 BUFFER_TRACE(sbh, "marking dirty");
2428 mark_buffer_dirty(sbh);
Darrick J. Wongdff68252010-10-04 12:35:05 -07002429 if (sync) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08002430 error = sync_dirty_buffer(sbh);
Darrick J. Wongdff68252010-10-04 12:35:05 -07002431 if (buffer_write_io_error(sbh)) {
2432 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2433 "superblock");
2434 clear_buffer_write_io_error(sbh);
2435 set_buffer_uptodate(sbh);
2436 }
2437 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002438 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002439}
2440
2441
2442/*
2443 * Have we just finished recovery? If so, and if we are mounting (or
2444 * remounting) the filesystem readonly, then we will end up with a
2445 * consistent fs on disk. Record that fact.
2446 */
2447static void ext3_mark_recovery_complete(struct super_block * sb,
2448 struct ext3_super_block * es)
2449{
2450 journal_t *journal = EXT3_SB(sb)->s_journal;
2451
2452 journal_lock_updates(journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002453 if (journal_flush(journal) < 0)
2454 goto out;
2455
Linus Torvalds1da177e2005-04-16 15:20:36 -07002456 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2457 sb->s_flags & MS_RDONLY) {
2458 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002459 ext3_commit_super(sb, es, 1);
2460 }
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002461
2462out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 journal_unlock_updates(journal);
2464}
2465
2466/*
2467 * If we are mounting (or read-write remounting) a filesystem whose journal
2468 * has recorded an error from a previous lifetime, move that error to the
2469 * main filesystem now.
2470 */
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002471static void ext3_clear_journal_err(struct super_block *sb,
2472 struct ext3_super_block *es)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473{
2474 journal_t *journal;
2475 int j_errno;
2476 const char *errstr;
2477
2478 journal = EXT3_SB(sb)->s_journal;
2479
2480 /*
2481 * Now check for any error status which may have been recorded in the
2482 * journal by a prior ext3_error() or ext3_abort()
2483 */
2484
2485 j_errno = journal_errno(journal);
2486 if (j_errno) {
2487 char nbuf[16];
2488
2489 errstr = ext3_decode_error(sb, j_errno, nbuf);
Harvey Harrisone05b6b52008-04-28 02:16:15 -07002490 ext3_warning(sb, __func__, "Filesystem error recorded "
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491 "from previous mount: %s", errstr);
Harvey Harrisone05b6b52008-04-28 02:16:15 -07002492 ext3_warning(sb, __func__, "Marking fs in need of "
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493 "filesystem check.");
2494
2495 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2496 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2497 ext3_commit_super (sb, es, 1);
2498
2499 journal_clear_err(journal);
2500 }
2501}
2502
2503/*
2504 * Force the running and committing transactions to commit,
2505 * and wait on the commit.
2506 */
2507int ext3_force_commit(struct super_block *sb)
2508{
2509 journal_t *journal;
2510 int ret;
2511
2512 if (sb->s_flags & MS_RDONLY)
2513 return 0;
2514
2515 journal = EXT3_SB(sb)->s_journal;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516 ret = ext3_journal_force_commit(journal);
2517 return ret;
2518}
2519
Linus Torvalds1da177e2005-04-16 15:20:36 -07002520static int ext3_sync_fs(struct super_block *sb, int wait)
2521{
Jan Kara02ac5972009-02-11 13:04:26 -08002522 tid_t target;
Arthur Jonesc87591b2008-11-06 12:53:35 -08002523
Lukas Czerner785c4bc2011-05-23 18:33:01 +02002524 trace_ext3_sync_fs(sb, wait);
Jan Kara02ac5972009-02-11 13:04:26 -08002525 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2526 if (wait)
2527 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529 return 0;
2530}
2531
2532/*
2533 * LVM calls this function before a (read-only) snapshot is created. This
2534 * gives us a chance to flush the journal completely and mark the fs clean.
2535 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08002536static int ext3_freeze(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537{
Takashi Satoc4be0c12009-01-09 16:40:58 -08002538 int error = 0;
2539 journal_t *journal;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540
2541 if (!(sb->s_flags & MS_RDONLY)) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08002542 journal = EXT3_SB(sb)->s_journal;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543
2544 /* Now we set up the journal barrier. */
2545 journal_lock_updates(journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002546
2547 /*
2548 * We don't want to clear needs_recovery flag when we failed
2549 * to flush the journal.
2550 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08002551 error = journal_flush(journal);
2552 if (error < 0)
2553 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554
2555 /* Journal blocked and flushed, clear needs_recovery flag. */
2556 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
Takashi Satoc4be0c12009-01-09 16:40:58 -08002557 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2558 if (error)
2559 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002561 return 0;
2562
2563out:
2564 journal_unlock_updates(journal);
2565 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566}
2567
2568/*
2569 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2570 * flag here, even though the filesystem is not technically dirty yet.
2571 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08002572static int ext3_unfreeze(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573{
2574 if (!(sb->s_flags & MS_RDONLY)) {
2575 lock_super(sb);
2576 /* Reser the needs_recovery flag before the fs is unlocked. */
2577 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2578 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2579 unlock_super(sb);
2580 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2581 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002582 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583}
2584
2585static int ext3_remount (struct super_block * sb, int * flags, char * data)
2586{
2587 struct ext3_super_block * es;
2588 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07002589 ext3_fsblk_t n_blocks_count = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002590 unsigned long old_sb_flags;
2591 struct ext3_mount_options old_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002592 int enable_quota = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002593 int err;
2594#ifdef CONFIG_QUOTA
2595 int i;
2596#endif
2597
2598 /* Store the original options */
Al Virobbd68512009-05-06 10:43:07 -04002599 lock_super(sb);
Jan Kara08c6a962005-07-12 13:58:28 -07002600 old_sb_flags = sb->s_flags;
2601 old_opts.s_mount_opt = sbi->s_mount_opt;
2602 old_opts.s_resuid = sbi->s_resuid;
2603 old_opts.s_resgid = sbi->s_resgid;
2604 old_opts.s_commit_interval = sbi->s_commit_interval;
2605#ifdef CONFIG_QUOTA
2606 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2607 for (i = 0; i < MAXQUOTAS; i++)
2608 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2609#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610
2611 /*
2612 * Allow the "check" option to be passed as a remount option.
2613 */
Johann Lombardi71b96252006-01-08 01:03:20 -08002614 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002615 err = -EINVAL;
2616 goto restore_opts;
2617 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618
Dmitry Monakhove3c96432010-02-02 16:05:51 +03002619 if (test_opt(sb, ABORT))
Harvey Harrisone05b6b52008-04-28 02:16:15 -07002620 ext3_abort(sb, __func__, "Abort forced by user");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621
2622 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhove3c96432010-02-02 16:05:51 +03002623 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624
2625 es = sbi->s_es;
2626
2627 ext3_init_journal_params(sb, sbi->s_journal);
2628
2629 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2630 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03002631 if (test_opt(sb, ABORT)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002632 err = -EROFS;
2633 goto restore_opts;
2634 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635
2636 if (*flags & MS_RDONLY) {
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002637 err = dquot_suspend(sb, -1);
2638 if (err < 0)
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002639 goto restore_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002640
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 /*
2642 * First of all, the unconditional stuff we have to do
2643 * to disable replay of the journal when we next remount
2644 */
2645 sb->s_flags |= MS_RDONLY;
2646
2647 /*
2648 * OK, test if we are remounting a valid rw partition
2649 * readonly, and if so set the rdonly flag and then
2650 * mark the partition as valid again.
2651 */
2652 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2653 (sbi->s_mount_state & EXT3_VALID_FS))
2654 es->s_state = cpu_to_le16(sbi->s_mount_state);
2655
2656 ext3_mark_recovery_complete(sb, es);
2657 } else {
2658 __le32 ret;
2659 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2660 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002661 ext3_msg(sb, KERN_WARNING,
2662 "warning: couldn't remount RDWR "
2663 "because of unsupported optional "
2664 "features (%x)", le32_to_cpu(ret));
Jan Kara08c6a962005-07-12 13:58:28 -07002665 err = -EROFS;
2666 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667 }
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002668
2669 /*
2670 * If we have an unprocessed orphan list hanging
2671 * around from a previously readonly bdev mount,
Toshiyuki Okajima1cde2012011-08-02 18:16:57 +09002672 * require a full umount & mount for now.
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002673 */
2674 if (es->s_last_orphan) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002675 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002676 "remount RDWR because of unprocessed "
2677 "orphan inode list. Please "
Toshiyuki Okajima1cde2012011-08-02 18:16:57 +09002678 "umount & mount instead.");
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002679 err = -EINVAL;
2680 goto restore_opts;
2681 }
2682
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 /*
2684 * Mounting a RDONLY partition read-write, so reread
2685 * and store the current valid flag. (It may have
2686 * been changed by e2fsck since we originally mounted
2687 * the partition.)
2688 */
2689 ext3_clear_journal_err(sb, es);
2690 sbi->s_mount_state = le16_to_cpu(es->s_state);
Dave Kleikampa4e4de32006-09-27 01:49:36 -07002691 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
Jan Kara08c6a962005-07-12 13:58:28 -07002692 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693 if (!ext3_setup_super (sb, es, 0))
2694 sb->s_flags &= ~MS_RDONLY;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002695 enable_quota = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696 }
2697 }
Jan Kara08c6a962005-07-12 13:58:28 -07002698#ifdef CONFIG_QUOTA
2699 /* Release old quota file names */
2700 for (i = 0; i < MAXQUOTAS; i++)
2701 if (old_opts.s_qf_names[i] &&
2702 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2703 kfree(old_opts.s_qf_names[i]);
2704#endif
Al Virobbd68512009-05-06 10:43:07 -04002705 unlock_super(sb);
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002706
2707 if (enable_quota)
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002708 dquot_resume(sb, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 return 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002710restore_opts:
2711 sb->s_flags = old_sb_flags;
2712 sbi->s_mount_opt = old_opts.s_mount_opt;
2713 sbi->s_resuid = old_opts.s_resuid;
2714 sbi->s_resgid = old_opts.s_resgid;
2715 sbi->s_commit_interval = old_opts.s_commit_interval;
2716#ifdef CONFIG_QUOTA
2717 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2718 for (i = 0; i < MAXQUOTAS; i++) {
2719 if (sbi->s_qf_names[i] &&
2720 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2721 kfree(sbi->s_qf_names[i]);
2722 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2723 }
2724#endif
Al Virobbd68512009-05-06 10:43:07 -04002725 unlock_super(sb);
Jan Kara08c6a962005-07-12 13:58:28 -07002726 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002727}
2728
David Howells726c3342006-06-23 02:02:58 -07002729static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730{
David Howells726c3342006-06-23 02:02:58 -07002731 struct super_block *sb = dentry->d_sb;
Alex Tomas09fe3162006-03-24 03:16:16 -08002732 struct ext3_sb_info *sbi = EXT3_SB(sb);
2733 struct ext3_super_block *es = sbi->s_es;
Pekka Enberg50ee0a32006-12-06 20:35:28 -08002734 u64 fsid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002736 if (test_opt(sb, MINIX_DF)) {
2737 sbi->s_overhead_last = 0;
2738 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2739 unsigned long ngroups = sbi->s_groups_count, i;
2740 ext3_fsblk_t overhead = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741 smp_rmb();
2742
2743 /*
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002744 * Compute the overhead (FS structures). This is constant
2745 * for a given filesystem unless the number of block groups
2746 * changes so we cache the previous value until it does.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002747 */
2748
2749 /*
2750 * All of the blocks before first_data_block are
2751 * overhead
2752 */
2753 overhead = le32_to_cpu(es->s_first_data_block);
2754
2755 /*
2756 * Add the overhead attributed to the superblock and
2757 * block group descriptors. If the sparse superblocks
2758 * feature is turned on, then not all groups have this.
2759 */
2760 for (i = 0; i < ngroups; i++) {
2761 overhead += ext3_bg_has_super(sb, i) +
2762 ext3_bg_num_gdb(sb, i);
2763 cond_resched();
2764 }
2765
2766 /*
2767 * Every block group has an inode bitmap, a block
2768 * bitmap, and an inode table.
2769 */
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002770 overhead += ngroups * (2 + sbi->s_itb_per_group);
2771 sbi->s_overhead_last = overhead;
2772 smp_wmb();
2773 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 }
2775
2776 buf->f_type = EXT3_SUPER_MAGIC;
2777 buf->f_bsize = sb->s_blocksize;
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002778 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002779 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2781 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2782 buf->f_bavail = 0;
2783 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002784 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785 buf->f_namelen = EXT3_NAME_LEN;
Pekka Enberg50ee0a32006-12-06 20:35:28 -08002786 fsid = le64_to_cpup((void *)es->s_uuid) ^
2787 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2788 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2789 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790 return 0;
2791}
2792
2793/* Helper function for writing quotas on sync - we need to start transaction before quota file
2794 * is locked for write. Otherwise the are possible deadlocks:
2795 * Process 1 Process 2
2796 * ext3_create() quota_sync()
2797 * journal_start() write_dquot()
Christoph Hellwig871a2932010-03-03 09:05:07 -05002798 * dquot_initialize() down(dqio_mutex)
Ingo Molnard3be9152006-03-23 03:00:29 -08002799 * down(dqio_mutex) journal_start()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800 *
2801 */
2802
2803#ifdef CONFIG_QUOTA
2804
2805static inline struct inode *dquot_to_inode(struct dquot *dquot)
2806{
2807 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2808}
2809
Linus Torvalds1da177e2005-04-16 15:20:36 -07002810static int ext3_write_dquot(struct dquot *dquot)
2811{
2812 int ret, err;
2813 handle_t *handle;
2814 struct inode *inode;
2815
2816 inode = dquot_to_inode(dquot);
2817 handle = ext3_journal_start(inode,
Jan Kara1f545872005-06-23 22:01:04 -07002818 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819 if (IS_ERR(handle))
2820 return PTR_ERR(handle);
2821 ret = dquot_commit(dquot);
2822 err = ext3_journal_stop(handle);
2823 if (!ret)
2824 ret = err;
2825 return ret;
2826}
2827
2828static int ext3_acquire_dquot(struct dquot *dquot)
2829{
2830 int ret, err;
2831 handle_t *handle;
2832
2833 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002834 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835 if (IS_ERR(handle))
2836 return PTR_ERR(handle);
2837 ret = dquot_acquire(dquot);
2838 err = ext3_journal_stop(handle);
2839 if (!ret)
2840 ret = err;
2841 return ret;
2842}
2843
2844static int ext3_release_dquot(struct dquot *dquot)
2845{
2846 int ret, err;
2847 handle_t *handle;
2848
2849 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002850 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07002851 if (IS_ERR(handle)) {
2852 /* Release dquot anyway to avoid endless cycle in dqput() */
2853 dquot_release(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07002855 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856 ret = dquot_release(dquot);
2857 err = ext3_journal_stop(handle);
2858 if (!ret)
2859 ret = err;
2860 return ret;
2861}
2862
2863static int ext3_mark_dquot_dirty(struct dquot *dquot)
2864{
Jan Kara99aeaf62008-07-25 01:46:17 -07002865 /* Are we journaling quotas? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2867 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2868 dquot_mark_dquot_dirty(dquot);
2869 return ext3_write_dquot(dquot);
2870 } else {
2871 return dquot_mark_dquot_dirty(dquot);
2872 }
2873}
2874
2875static int ext3_write_info(struct super_block *sb, int type)
2876{
2877 int ret, err;
2878 handle_t *handle;
2879
2880 /* Data block + inode block */
2881 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2882 if (IS_ERR(handle))
2883 return PTR_ERR(handle);
2884 ret = dquot_commit_info(sb, type);
2885 err = ext3_journal_stop(handle);
2886 if (!ret)
2887 ret = err;
2888 return ret;
2889}
2890
2891/*
2892 * Turn on quotas during mount time - we need to find
2893 * the quota file and such...
2894 */
2895static int ext3_quota_on_mount(struct super_block *sb, int type)
2896{
Christoph Hellwig287a8092010-05-19 07:16:45 -04002897 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2898 EXT3_SB(sb)->s_jquota_fmt, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002899}
2900
2901/*
2902 * Standard function to be called on quota_on
2903 */
2904static int ext3_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +02002905 struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906{
2907 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002908
Jan Kara1f545872005-06-23 22:01:04 -07002909 if (!test_opt(sb, QUOTA))
2910 return -EINVAL;
Jan Kara9cfe7b92008-07-25 01:46:16 -07002911
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 /* Quotafile not on the same filesystem? */
Al Virod8c95842011-12-07 18:16:57 -05002913 if (path->dentry->d_sb != sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002914 return -EXDEV;
Jan Kara9cfe7b92008-07-25 01:46:16 -07002915 /* Journaling quota? */
2916 if (EXT3_SB(sb)->s_qf_names[type]) {
2917 /* Quotafile not of fs root? */
Jan Karaf00c9e42010-09-15 17:38:58 +02002918 if (path->dentry->d_parent != sb->s_root)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002919 ext3_msg(sb, KERN_WARNING,
2920 "warning: Quota file not on filesystem root. "
2921 "Journaled quota will not work.");
Jan Kara9cfe7b92008-07-25 01:46:16 -07002922 }
2923
2924 /*
2925 * When we journal data on quota file, we have to flush journal to see
2926 * all updates to the file when we bypass pagecache...
2927 */
Jan Karaf00c9e42010-09-15 17:38:58 +02002928 if (ext3_should_journal_data(path->dentry->d_inode)) {
Jan Kara9cfe7b92008-07-25 01:46:16 -07002929 /*
2930 * We don't need to lock updates but journal_flush() could
2931 * otherwise be livelocked...
2932 */
2933 journal_lock_updates(EXT3_SB(sb)->s_journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002934 err = journal_flush(EXT3_SB(sb)->s_journal);
Jan Kara9cfe7b92008-07-25 01:46:16 -07002935 journal_unlock_updates(EXT3_SB(sb)->s_journal);
Jan Karaf00c9e42010-09-15 17:38:58 +02002936 if (err)
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002937 return err;
Jan Kara9cfe7b92008-07-25 01:46:16 -07002938 }
2939
Jan Karaf00c9e42010-09-15 17:38:58 +02002940 return dquot_quota_on(sb, type, format_id, path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941}
2942
2943/* Read data from quotafile - avoid pagecache and such because we cannot afford
2944 * acquiring the locks... As quota files are never truncated and quota code
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002945 * itself serializes the operations (and no one else should touch the files)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946 * we don't have to be afraid of races */
2947static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2948 size_t len, loff_t off)
2949{
2950 struct inode *inode = sb_dqopt(sb)->files[type];
2951 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2952 int err = 0;
2953 int offset = off & (sb->s_blocksize - 1);
2954 int tocopy;
2955 size_t toread;
2956 struct buffer_head *bh;
2957 loff_t i_size = i_size_read(inode);
2958
2959 if (off > i_size)
2960 return 0;
2961 if (off+len > i_size)
2962 len = i_size-off;
2963 toread = len;
2964 while (toread > 0) {
2965 tocopy = sb->s_blocksize - offset < toread ?
2966 sb->s_blocksize - offset : toread;
2967 bh = ext3_bread(NULL, inode, blk, 0, &err);
2968 if (err)
2969 return err;
2970 if (!bh) /* A hole? */
2971 memset(data, 0, tocopy);
2972 else
2973 memcpy(data, bh->b_data+offset, tocopy);
2974 brelse(bh);
2975 offset = 0;
2976 toread -= tocopy;
2977 data += tocopy;
2978 blk++;
2979 }
2980 return len;
2981}
2982
2983/* Write to quotafile (we know the transaction is already started and has
2984 * enough credits) */
2985static ssize_t ext3_quota_write(struct super_block *sb, int type,
2986 const char *data, size_t len, loff_t off)
2987{
2988 struct inode *inode = sb_dqopt(sb)->files[type];
2989 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2990 int err = 0;
2991 int offset = off & (sb->s_blocksize - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002992 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 struct buffer_head *bh;
2994 handle_t *handle = journal_current_handle();
2995
Jan Kara9c3013e2007-09-11 15:23:29 -07002996 if (!handle) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002997 ext3_msg(sb, KERN_WARNING,
2998 "warning: quota write (off=%llu, len=%llu)"
2999 " cancelled because transaction is not started.",
Jan Kara9c3013e2007-09-11 15:23:29 -07003000 (unsigned long long)off, (unsigned long long)len);
3001 return -EIO;
3002 }
Dmitry Monakhove5472142010-02-16 19:33:42 +03003003
3004 /*
3005 * Since we account only one data block in transaction credits,
3006 * then it is impossible to cross a block boundary.
3007 */
3008 if (sb->s_blocksize - offset < len) {
3009 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3010 " cancelled because not block aligned",
3011 (unsigned long long)off, (unsigned long long)len);
3012 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003013 }
Dmitry Monakhove5472142010-02-16 19:33:42 +03003014 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3015 bh = ext3_bread(handle, inode, blk, 1, &err);
3016 if (!bh)
3017 goto out;
3018 if (journal_quota) {
3019 err = ext3_journal_get_write_access(handle, bh);
3020 if (err) {
3021 brelse(bh);
3022 goto out;
3023 }
3024 }
3025 lock_buffer(bh);
3026 memcpy(bh->b_data+offset, data, len);
3027 flush_dcache_page(bh->b_page);
3028 unlock_buffer(bh);
3029 if (journal_quota)
3030 err = ext3_journal_dirty_metadata(handle, bh);
3031 else {
3032 /* Always do at least ordered writes for quotas */
3033 err = ext3_journal_dirty_data(handle, bh);
3034 mark_buffer_dirty(bh);
3035 }
3036 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037out:
Dmitry Monakhove5472142010-02-16 19:33:42 +03003038 if (err) {
Jan Karaf5c8f7d2008-07-04 09:59:33 -07003039 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040 return err;
Jan Karaf5c8f7d2008-07-04 09:59:33 -07003041 }
Dmitry Monakhove5472142010-02-16 19:33:42 +03003042 if (inode->i_size < off + len) {
3043 i_size_write(inode, off + len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044 EXT3_I(inode)->i_disksize = inode->i_size;
3045 }
3046 inode->i_version++;
3047 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3048 ext3_mark_inode_dirty(handle, inode);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08003049 mutex_unlock(&inode->i_mutex);
Dmitry Monakhove5472142010-02-16 19:33:42 +03003050 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003051}
3052
3053#endif
3054
Al Viro152a0832010-07-25 00:46:55 +04003055static struct dentry *ext3_mount(struct file_system_type *fs_type,
3056 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057{
Al Viro152a0832010-07-25 00:46:55 +04003058 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059}
3060
3061static struct file_system_type ext3_fs_type = {
3062 .owner = THIS_MODULE,
3063 .name = "ext3",
Al Viro152a0832010-07-25 00:46:55 +04003064 .mount = ext3_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065 .kill_sb = kill_block_super,
3066 .fs_flags = FS_REQUIRES_DEV,
3067};
3068
3069static int __init init_ext3_fs(void)
3070{
3071 int err = init_ext3_xattr();
3072 if (err)
3073 return err;
3074 err = init_inodecache();
3075 if (err)
3076 goto out1;
3077 err = register_filesystem(&ext3_fs_type);
3078 if (err)
3079 goto out;
3080 return 0;
3081out:
3082 destroy_inodecache();
3083out1:
Dave Kleikampe9ad5622006-09-27 01:49:35 -07003084 exit_ext3_xattr();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 return err;
3086}
3087
3088static void __exit exit_ext3_fs(void)
3089{
3090 unregister_filesystem(&ext3_fs_type);
3091 destroy_inodecache();
3092 exit_ext3_xattr();
3093}
3094
3095MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3096MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3097MODULE_LICENSE("GPL");
3098module_init(init_ext3_fs)
3099module_exit(exit_ext3_fs)