blob: 9b4e7d750d4fdf23571e4d95a816349d78530856 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/blkdev.h>
21#include <linux/parser.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070022#include <linux/exportfs.h>
Al Viro4613ad12012-03-29 22:30:07 -040023#include <linux/statfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/random.h>
25#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/quotaops.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070027#include <linux/seq_file.h>
vignesh babu3fc74262007-07-15 23:41:17 -070028#include <linux/log2.h>
Dan Magenheimerd71bc6d2011-05-26 10:01:49 -060029#include <linux/cleancache.h>
Eric Sandeencf7eff42013-07-31 14:33:00 -050030#include <linux/namei.h>
Ben Dooks381be2542005-10-30 15:02:56 -080031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/uaccess.h>
Ben Dooks381be2542005-10-30 15:02:56 -080033
Al Viro4613ad12012-03-29 22:30:07 -040034#define CREATE_TRACE_POINTS
35
36#include "ext3.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xattr.h"
38#include "acl.h"
Ben Dooks381be2542005-10-30 15:02:56 -080039#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -070041#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
42 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
43#else
44 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
45#endif
46
Johann Lombardi71b96252006-01-08 01:03:20 -080047static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
Eric Sandeeneee194e2006-09-27 01:49:30 -070050 unsigned int);
Takashi Satoc4be0c12009-01-09 16:40:58 -080051static int ext3_commit_super(struct super_block *sb,
52 struct ext3_super_block *es,
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 int sync);
54static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58static int ext3_sync_fs(struct super_block *sb, int wait);
59static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61static int ext3_remount (struct super_block * sb, int * flags, char * data);
David Howells726c3342006-06-23 02:02:58 -070062static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
Takashi Satoc4be0c12009-01-09 16:40:58 -080063static int ext3_unfreeze(struct super_block *sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -080064static int ext3_freeze(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Mingming Caoae6ddcc2006-09-27 01:49:27 -070066/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 * Wrappers for journal_start/end.
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 */
69handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
70{
71 journal_t *journal;
72
73 if (sb->s_flags & MS_RDONLY)
74 return ERR_PTR(-EROFS);
75
76 /* Special case here: if the journal has aborted behind our
77 * backs (eg. EIO in the commit thread), then we still need to
78 * take the FS itself readonly cleanly. */
79 journal = EXT3_SB(sb)->s_journal;
80 if (is_journal_aborted(journal)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -070081 ext3_abort(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 "Detected aborted journal");
83 return ERR_PTR(-EROFS);
84 }
85
86 return journal_start(journal, nblocks);
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089int __ext3_journal_stop(const char *where, handle_t *handle)
90{
91 struct super_block *sb;
92 int err;
93 int rc;
94
95 sb = handle->h_transaction->t_journal->j_private;
96 err = handle->h_err;
97 rc = journal_stop(handle);
98
99 if (!err)
100 err = rc;
101 if (err)
102 __ext3_std_error(sb, where, err);
103 return err;
104}
105
106void ext3_journal_abort_handle(const char *caller, const char *err_fn,
107 struct buffer_head *bh, handle_t *handle, int err)
108{
109 char nbuf[16];
110 const char *errstr = ext3_decode_error(NULL, err, nbuf);
111
112 if (bh)
113 BUFFER_TRACE(bh, "abort");
114
115 if (!handle->h_err)
116 handle->h_err = err;
117
118 if (is_handle_aborted(handle))
119 return;
120
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100121 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
122 caller, errstr, err_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 journal_abort_handle(handle);
125}
126
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100127void ext3_msg(struct super_block *sb, const char *prefix,
128 const char *fmt, ...)
129{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800130 struct va_format vaf;
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100131 va_list args;
132
133 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800134
135 vaf.fmt = fmt;
136 vaf.va = &args;
137
138 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
139
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100140 va_end(args);
141}
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143/* Deal with the reporting of failure conditions on a filesystem such as
144 * inconsistencies detected or read IO failures.
145 *
146 * On ext2, we can store the error state of the filesystem in the
147 * superblock. That is not possible on ext3, because we may have other
148 * write ordering constraints on the superblock which prevent us from
149 * writing it out straight away; and given that the journal is about to
150 * be aborted, we can't rely on the current, or future, transactions to
151 * write out the superblock safely.
152 *
153 * We'll just use the journal_abort() error code to record an error in
Thadeu Lima de Souza Cascardod6b198b2010-01-17 19:10:07 -0200154 * the journal instead. On recovery, the journal will complain about
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 * that error until we've noted it down and cleared it.
156 */
157
158static void ext3_handle_error(struct super_block *sb)
159{
160 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
161
162 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
163 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
164
165 if (sb->s_flags & MS_RDONLY)
166 return;
167
Vasily Averin7543fc72006-09-27 01:49:33 -0700168 if (!test_opt (sb, ERRORS_CONT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 journal_t *journal = EXT3_SB(sb)->s_journal;
170
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300171 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (journal)
173 journal_abort(journal, -EIO);
174 }
Vasily Averin7543fc72006-09-27 01:49:33 -0700175 if (test_opt (sb, ERRORS_RO)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100176 ext3_msg(sb, KERN_CRIT,
177 "error: remounting filesystem read-only");
Dmitry Monakhov3df32192013-05-28 13:19:01 +0400178 /*
179 * Make sure updated value of ->s_mount_state will be visible
180 * before ->s_flags update.
181 */
182 smp_wmb();
Vasily Averin7543fc72006-09-27 01:49:33 -0700183 sb->s_flags |= MS_RDONLY;
184 }
185 ext3_commit_super(sb, es, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 if (test_opt(sb, ERRORS_PANIC))
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100187 panic("EXT3-fs (%s): panic forced after error\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 sb->s_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189}
190
Joe Perches99fbb1e2010-11-09 10:18:05 -0800191void ext3_error(struct super_block *sb, const char *function,
192 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800194 struct va_format vaf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 va_list args;
196
197 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800198
199 vaf.fmt = fmt;
200 vaf.va = &args;
201
202 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
203 sb->s_id, function, &vaf);
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 va_end(args);
206
207 ext3_handle_error(sb);
208}
209
210static const char *ext3_decode_error(struct super_block * sb, int errno,
211 char nbuf[16])
212{
213 char *errstr = NULL;
214
215 switch (errno) {
216 case -EIO:
217 errstr = "IO failure";
218 break;
219 case -ENOMEM:
220 errstr = "Out of memory";
221 break;
222 case -EROFS:
223 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
224 errstr = "Journal has aborted";
225 else
226 errstr = "Readonly filesystem";
227 break;
228 default:
229 /* If the caller passed in an extra buffer for unknown
230 * errors, textualise them now. Else we just return
231 * NULL. */
232 if (nbuf) {
233 /* Check for truncated error codes... */
234 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
235 errstr = nbuf;
236 }
237 break;
238 }
239
240 return errstr;
241}
242
243/* __ext3_std_error decodes expected errors from journaling functions
244 * automatically and invokes the appropriate error response. */
245
246void __ext3_std_error (struct super_block * sb, const char * function,
247 int errno)
248{
249 char nbuf[16];
Stephen Tweedie30121622005-05-18 11:47:17 -0400250 const char *errstr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Stephen Tweedie30121622005-05-18 11:47:17 -0400252 /* Special case: if the error is EROFS, and we're not already
253 * inside a transaction, then there's really no point in logging
254 * an error. */
255 if (errno == -EROFS && journal_current_handle() == NULL &&
256 (sb->s_flags & MS_RDONLY))
257 return;
258
259 errstr = ext3_decode_error(sb, errno, nbuf);
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100260 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 ext3_handle_error(sb);
263}
264
265/*
266 * ext3_abort is a much stronger failure handler than ext3_error. The
267 * abort function may be used to deal with unrecoverable failures such
268 * as journal IO errors or ENOMEM at a critical moment in log management.
269 *
270 * We unconditionally force the filesystem into an ABORT|READONLY state,
271 * unless the error response on the fs has been set to panic in which
272 * case we take the easy way out and panic immediately.
273 */
274
Joe Perches99fbb1e2010-11-09 10:18:05 -0800275void ext3_abort(struct super_block *sb, const char *function,
276 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800278 struct va_format vaf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 va_list args;
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800282
283 vaf.fmt = fmt;
284 vaf.va = &args;
285
286 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
287 sb->s_id, function, &vaf);
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 va_end(args);
290
291 if (test_opt(sb, ERRORS_PANIC))
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100292 panic("EXT3-fs: panic from previous error\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 if (sb->s_flags & MS_RDONLY)
295 return;
296
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100297 ext3_msg(sb, KERN_CRIT,
298 "error: remounting filesystem read-only");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300300 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
Dmitry Monakhov3df32192013-05-28 13:19:01 +0400301 /*
302 * Make sure updated value of ->s_mount_state will be visible
303 * before ->s_flags update.
304 */
305 smp_wmb();
306 sb->s_flags |= MS_RDONLY;
307
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400308 if (EXT3_SB(sb)->s_journal)
309 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
Joe Perches99fbb1e2010-11-09 10:18:05 -0800312void ext3_warning(struct super_block *sb, const char *function,
313 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
Joe Perches99fbb1e2010-11-09 10:18:05 -0800315 struct va_format vaf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 va_list args;
317
318 va_start(args, fmt);
Joe Perches99fbb1e2010-11-09 10:18:05 -0800319
320 vaf.fmt = fmt;
321 vaf.va = &args;
322
323 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
324 sb->s_id, function, &vaf);
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 va_end(args);
327}
328
329void ext3_update_dynamic_rev(struct super_block *sb)
330{
331 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
332
333 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
334 return;
335
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100336 ext3_msg(sb, KERN_WARNING,
337 "warning: updating to rev %d because of "
338 "new feature flag, running e2fsck is recommended",
339 EXT3_DYNAMIC_REV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
342 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
343 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
344 /* leave es->s_feature_*compat flags alone */
345 /* es->s_uuid will be set by e2fsck if empty */
346
347 /*
348 * The rest of the superblock fields should be zero, and if not it
349 * means they are likely already in use, so leave them alone. We
350 * can leave it up to e2fsck to clean up any inconsistencies there.
351 */
352}
353
354/*
355 * Open the external journal device
356 */
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100357static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
359 struct block_device *bdev;
360 char b[BDEVNAME_SIZE];
361
Tejun Heod4d77622010-11-13 11:55:18 +0100362 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 if (IS_ERR(bdev))
364 goto fail;
365 return bdev;
366
367fail:
Lars-Peter Clausen8d0c2d12013-03-09 15:28:44 +0100368 ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100369 __bdevname(dev, b), PTR_ERR(bdev));
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 return NULL;
372}
373
374/*
375 * Release the journal device
376 */
Al Viro4385bab2013-05-05 22:11:03 -0400377static void ext3_blkdev_put(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
Al Viro4385bab2013-05-05 22:11:03 -0400379 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
Al Viro4385bab2013-05-05 22:11:03 -0400382static void ext3_blkdev_remove(struct ext3_sb_info *sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 struct block_device *bdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 bdev = sbi->journal_bdev;
386 if (bdev) {
Al Viro4385bab2013-05-05 22:11:03 -0400387 ext3_blkdev_put(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 sbi->journal_bdev = NULL;
389 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390}
391
392static inline struct inode *orphan_list_entry(struct list_head *l)
393{
394 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
395}
396
397static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
398{
399 struct list_head *l;
400
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100401 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 le32_to_cpu(sbi->s_es->s_last_orphan));
403
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100404 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 list_for_each(l, &sbi->s_orphan) {
406 struct inode *inode = orphan_list_entry(l);
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100407 ext3_msg(sb, KERN_ERR, " "
Eric Sandeeneee194e2006-09-27 01:49:30 -0700408 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 inode->i_sb->s_id, inode->i_ino, inode,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700410 inode->i_mode, inode->i_nlink,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 NEXT_ORPHAN(inode));
412 }
413}
414
415static void ext3_put_super (struct super_block * sb)
416{
417 struct ext3_sb_info *sbi = EXT3_SB(sb);
418 struct ext3_super_block *es = sbi->s_es;
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400419 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Christoph Hellwige0ccfd92010-05-19 07:16:42 -0400421 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 ext3_xattr_put_super(sb);
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400423 err = journal_destroy(sbi->s_journal);
424 sbi->s_journal = NULL;
425 if (err < 0)
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700426 ext3_abort(sb, __func__, "Couldn't clean up the journal");
Hidehiro Kawai44d6f782008-10-27 22:51:46 -0400427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (!(sb->s_flags & MS_RDONLY)) {
429 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
430 es->s_state = cpu_to_le16(sbi->s_mount_state);
431 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
432 mark_buffer_dirty(sbi->s_sbh);
433 ext3_commit_super(sb, es, 1);
434 }
435
436 for (i = 0; i < sbi->s_gdb_count; i++)
437 brelse(sbi->s_group_desc[i]);
438 kfree(sbi->s_group_desc);
439 percpu_counter_destroy(&sbi->s_freeblocks_counter);
440 percpu_counter_destroy(&sbi->s_freeinodes_counter);
441 percpu_counter_destroy(&sbi->s_dirs_counter);
442 brelse(sbi->s_sbh);
443#ifdef CONFIG_QUOTA
Jan Karaa93114e2014-09-10 20:48:02 +0200444 for (i = 0; i < EXT3_MAXQUOTAS; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 kfree(sbi->s_qf_names[i]);
446#endif
447
448 /* Debugging code just in case the in-memory inode orphan list
449 * isn't empty. The on-disk one can be non-empty if we've
450 * detected an error and taken the fs readonly, but the
451 * in-memory list had better be clean by this point. */
452 if (!list_empty(&sbi->s_orphan))
453 dump_orphan_list(sb, sbi);
454 J_ASSERT(list_empty(&sbi->s_orphan));
455
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700456 invalidate_bdev(sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
458 /*
459 * Invalidate the journal device's buffers. We don't want them
460 * floating about in memory - the physical journal device may
461 * hotswapped, and it breaks the `ro-after' testing code.
462 */
463 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700464 invalidate_bdev(sbi->journal_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 ext3_blkdev_remove(sbi);
466 }
467 sb->s_fs_info = NULL;
Pekka Enberg5df096d2009-01-07 18:07:25 -0800468 kfree(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 kfree(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
Christoph Lametere18b8902006-12-06 20:33:20 -0800472static struct kmem_cache *ext3_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474/*
475 * Called inside transaction, so use GFP_NOFS
476 */
477static struct inode *ext3_alloc_inode(struct super_block *sb)
478{
479 struct ext3_inode_info *ei;
480
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800481 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (!ei)
483 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 ei->i_block_alloc_info = NULL;
485 ei->vfs_inode.i_version = 1;
Jan Karafe8bc912009-10-16 19:26:15 +0200486 atomic_set(&ei->i_datasync_tid, 0);
487 atomic_set(&ei->i_sync_tid, 0);
Jan Kara4018cfb2014-09-25 16:52:38 +0200488#ifdef CONFIG_QUOTA
489 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
490#endif
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 return &ei->vfs_inode;
493}
494
Lukas Czerner785c4bc2011-05-23 18:33:01 +0200495static int ext3_drop_inode(struct inode *inode)
496{
497 int drop = generic_drop_inode(inode);
498
499 trace_ext3_drop_inode(inode, drop);
500 return drop;
501}
502
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100503static void ext3_i_callback(struct rcu_head *head)
504{
505 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100506 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
507}
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509static void ext3_destroy_inode(struct inode *inode)
510{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700511 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
512 printk("EXT3 Inode %p: orphan list check failed!\n",
513 EXT3_I(inode));
514 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
515 EXT3_I(inode), sizeof(struct ext3_inode_info),
516 false);
517 dump_stack();
518 }
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100519 call_rcu(&inode->i_rcu, ext3_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520}
521
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700522static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
524 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
525
Christoph Lametera35afb82007-05-16 22:10:57 -0700526 INIT_LIST_HEAD(&ei->i_orphan);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527#ifdef CONFIG_EXT3_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700528 init_rwsem(&ei->xattr_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529#endif
Christoph Lametera35afb82007-05-16 22:10:57 -0700530 mutex_init(&ei->truncate_mutex);
531 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700533
Fabian Frederick1da8b822014-02-01 19:13:00 +0800534static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
536 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
537 sizeof(struct ext3_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800538 0, (SLAB_RECLAIM_ACCOUNT|
539 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900540 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (ext3_inode_cachep == NULL)
542 return -ENOMEM;
543 return 0;
544}
545
546static void destroy_inodecache(void)
547{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000548 /*
549 * Make sure all delayed rcu free inodes are flushed before we
550 * destroy cache.
551 */
552 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700553 kmem_cache_destroy(ext3_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554}
555
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200556static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
Mark Bellon8fc27512005-09-06 15:16:54 -0700557{
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200558#if defined(CONFIG_QUOTA)
OGAWA Hirofumi275abf52005-09-22 21:44:03 -0700559 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Jan Kara1aeec432009-11-30 22:22:41 +0100561 if (sbi->s_jquota_fmt) {
562 char *fmtname = "";
563
564 switch (sbi->s_jquota_fmt) {
565 case QFMT_VFS_OLD:
566 fmtname = "vfsold";
567 break;
568 case QFMT_VFS_V0:
569 fmtname = "vfsv0";
570 break;
571 case QFMT_VFS_V1:
572 fmtname = "vfsv1";
573 break;
574 }
575 seq_printf(seq, ",jqfmt=%s", fmtname);
576 }
Mark Bellon8fc27512005-09-06 15:16:54 -0700577
578 if (sbi->s_qf_names[USRQUOTA])
579 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
580
581 if (sbi->s_qf_names[GRPQUOTA])
582 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
583
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300584 if (test_opt(sb, USRQUOTA))
Mark Bellon8fc27512005-09-06 15:16:54 -0700585 seq_puts(seq, ",usrquota");
586
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300587 if (test_opt(sb, GRPQUOTA))
Mark Bellon8fc27512005-09-06 15:16:54 -0700588 seq_puts(seq, ",grpquota");
589#endif
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200590}
591
Jan Kara3c4cec62009-08-24 16:38:43 +0200592static char *data_mode_string(unsigned long mode)
593{
594 switch (mode) {
595 case EXT3_MOUNT_JOURNAL_DATA:
596 return "journal";
597 case EXT3_MOUNT_ORDERED_DATA:
598 return "ordered";
599 case EXT3_MOUNT_WRITEBACK_DATA:
600 return "writeback";
601 }
602 return "unknown";
603}
604
Miklos Szeredi571beed2007-10-16 23:26:26 -0700605/*
606 * Show an option if
607 * - it's set to a non-default value OR
608 * - if the per-sb default is different from the global default
609 */
Al Viro34c80b12011-12-08 21:32:45 -0500610static int ext3_show_options(struct seq_file *seq, struct dentry *root)
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200611{
Al Viro34c80b12011-12-08 21:32:45 -0500612 struct super_block *sb = root->d_sb;
Miklos Szeredi571beed2007-10-16 23:26:26 -0700613 struct ext3_sb_info *sbi = EXT3_SB(sb);
614 struct ext3_super_block *es = sbi->s_es;
615 unsigned long def_mount_opts;
616
617 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
618
619 if (sbi->s_sb_block != 1)
620 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
621 if (test_opt(sb, MINIX_DF))
622 seq_puts(seq, ",minixdf");
623 if (test_opt(sb, GRPID))
624 seq_puts(seq, ",grpid");
625 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
626 seq_puts(seq, ",nogrpid");
Eric W. Biederman15232992012-02-07 15:41:24 -0800627 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
Miklos Szeredi571beed2007-10-16 23:26:26 -0700628 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
Eric W. Biederman15232992012-02-07 15:41:24 -0800629 seq_printf(seq, ",resuid=%u",
630 from_kuid_munged(&init_user_ns, sbi->s_resuid));
Miklos Szeredi571beed2007-10-16 23:26:26 -0700631 }
Eric W. Biederman15232992012-02-07 15:41:24 -0800632 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
Miklos Szeredi571beed2007-10-16 23:26:26 -0700633 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
Eric W. Biederman15232992012-02-07 15:41:24 -0800634 seq_printf(seq, ",resgid=%u",
635 from_kgid_munged(&init_user_ns, sbi->s_resgid));
Miklos Szeredi571beed2007-10-16 23:26:26 -0700636 }
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -0800637 if (test_opt(sb, ERRORS_RO)) {
Miklos Szeredi571beed2007-10-16 23:26:26 -0700638 int def_errors = le16_to_cpu(es->s_errors);
639
640 if (def_errors == EXT3_ERRORS_PANIC ||
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -0800641 def_errors == EXT3_ERRORS_CONTINUE) {
642 seq_puts(seq, ",errors=remount-ro");
Miklos Szeredi571beed2007-10-16 23:26:26 -0700643 }
644 }
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -0800645 if (test_opt(sb, ERRORS_CONT))
646 seq_puts(seq, ",errors=continue");
Miklos Szeredi571beed2007-10-16 23:26:26 -0700647 if (test_opt(sb, ERRORS_PANIC))
648 seq_puts(seq, ",errors=panic");
649 if (test_opt(sb, NO_UID32))
650 seq_puts(seq, ",nouid32");
651 if (test_opt(sb, DEBUG))
652 seq_puts(seq, ",debug");
Miklos Szeredi571beed2007-10-16 23:26:26 -0700653#ifdef CONFIG_EXT3_FS_XATTR
654 if (test_opt(sb, XATTR_USER))
655 seq_puts(seq, ",user_xattr");
656 if (!test_opt(sb, XATTR_USER) &&
657 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
658 seq_puts(seq, ",nouser_xattr");
659 }
660#endif
661#ifdef CONFIG_EXT3_FS_POSIX_ACL
662 if (test_opt(sb, POSIX_ACL))
663 seq_puts(seq, ",acl");
664 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
665 seq_puts(seq, ",noacl");
666#endif
667 if (!test_opt(sb, RESERVATION))
668 seq_puts(seq, ",noreservation");
669 if (sbi->s_commit_interval) {
670 seq_printf(seq, ",commit=%u",
671 (unsigned) (sbi->s_commit_interval / HZ));
672 }
Eric Sandeen0636c732010-04-30 11:09:34 -0500673
674 /*
675 * Always display barrier state so it's clear what the status is.
676 */
677 seq_puts(seq, ",barrier=");
678 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
Dmitry Monakhove3c96432010-02-02 16:05:51 +0300679 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -0700680 if (test_opt(sb, DATA_ERR_ABORT))
681 seq_puts(seq, ",data_err=abort");
682
Eric Sandeendee1d3b2009-11-16 16:50:49 -0600683 if (test_opt(sb, NOLOAD))
684 seq_puts(seq, ",norecovery");
685
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200686 ext3_show_quota_options(seq, sb);
Mark Bellon8fc27512005-09-06 15:16:54 -0700687
688 return 0;
689}
690
NeilBrownfdb36672006-09-16 12:15:38 -0700691
Christoph Hellwig74af0ba2007-10-21 16:42:07 -0700692static struct inode *ext3_nfs_get_inode(struct super_block *sb,
693 u64 ino, u32 generation)
NeilBrownfdb36672006-09-16 12:15:38 -0700694{
NeilBrownfdb36672006-09-16 12:15:38 -0700695 struct inode *inode;
NeilBrownfdb36672006-09-16 12:15:38 -0700696
697 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
698 return ERR_PTR(-ESTALE);
699 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
700 return ERR_PTR(-ESTALE);
701
702 /* iget isn't really right if the inode is currently unallocated!!
703 *
704 * ext3_read_inode will return a bad_inode if the inode had been
705 * deleted, so we should be safe.
706 *
707 * Currently we don't know the generation for parent directory, so
708 * a generation of 0 means "accept any"
709 */
David Howells473043d2008-02-07 00:15:36 -0800710 inode = ext3_iget(sb, ino);
711 if (IS_ERR(inode))
712 return ERR_CAST(inode);
713 if (generation && inode->i_generation != generation) {
NeilBrownfdb36672006-09-16 12:15:38 -0700714 iput(inode);
715 return ERR_PTR(-ESTALE);
716 }
Christoph Hellwig74af0ba2007-10-21 16:42:07 -0700717
718 return inode;
719}
720
721static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
722 int fh_len, int fh_type)
723{
724 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
725 ext3_nfs_get_inode);
726}
727
728static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
729 int fh_len, int fh_type)
730{
731 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
732 ext3_nfs_get_inode);
NeilBrownfdb36672006-09-16 12:15:38 -0700733}
734
Toshiyuki Okajima6b082b52009-01-05 22:38:14 -0500735/*
736 * Try to release metadata pages (indirect blocks, directories) which are
737 * mapped via the block device. Since these pages could have journal heads
738 * which would prevent try_to_free_buffers() from freeing them, we must use
739 * jbd layer's try_to_free_buffers() function to release them.
740 */
741static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
742 gfp_t wait)
743{
744 journal_t *journal = EXT3_SB(sb)->s_journal;
745
746 WARN_ON(PageChecked(page));
747 if (!page_has_buffers(page))
748 return 0;
749 if (journal)
750 return journal_try_to_free_buffers(journal, page,
751 wait & ~__GFP_WAIT);
752 return try_to_free_buffers(page);
753}
754
Mark Bellon8fc27512005-09-06 15:16:54 -0700755#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
757#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759static int ext3_write_dquot(struct dquot *dquot);
760static int ext3_acquire_dquot(struct dquot *dquot);
761static int ext3_release_dquot(struct dquot *dquot);
762static int ext3_mark_dquot_dirty(struct dquot *dquot);
763static int ext3_write_info(struct super_block *sb, int type);
Jan Kara2fd83a42008-04-28 02:14:34 -0700764static int ext3_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +0200765 struct path *path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766static int ext3_quota_on_mount(struct super_block *sb, int type);
767static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
768 size_t len, loff_t off);
769static ssize_t ext3_quota_write(struct super_block *sb, int type,
770 const char *data, size_t len, loff_t off);
Jan Kara4018cfb2014-09-25 16:52:38 +0200771static struct dquot **ext3_get_dquots(struct inode *inode)
772{
773 return EXT3_I(inode)->i_dquot;
774}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Alexey Dobriyan61e225d2009-09-21 17:01:08 -0700776static const struct dquot_operations ext3_quota_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 .write_dquot = ext3_write_dquot,
778 .acquire_dquot = ext3_acquire_dquot,
779 .release_dquot = ext3_release_dquot,
780 .mark_dirty = ext3_mark_dquot_dirty,
Jan Kara157091a2008-11-25 15:31:34 +0100781 .write_info = ext3_write_info,
782 .alloc_dquot = dquot_alloc,
783 .destroy_dquot = dquot_destroy,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784};
785
Alexey Dobriyan0d54b212009-09-21 17:01:09 -0700786static const struct quotactl_ops ext3_qctl_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 .quota_on = ext3_quota_on,
Christoph Hellwig287a8092010-05-19 07:16:45 -0400788 .quota_off = dquot_quota_off,
789 .quota_sync = dquot_quota_sync,
790 .get_info = dquot_get_dqinfo,
791 .set_info = dquot_set_dqinfo,
792 .get_dqblk = dquot_get_dqblk,
793 .set_dqblk = dquot_set_dqblk
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794};
795#endif
796
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800797static const struct super_operations ext3_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 .alloc_inode = ext3_alloc_inode,
799 .destroy_inode = ext3_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 .write_inode = ext3_write_inode,
801 .dirty_inode = ext3_dirty_inode,
Lukas Czerner785c4bc2011-05-23 18:33:01 +0200802 .drop_inode = ext3_drop_inode,
Al Viroac14a952010-06-06 07:08:19 -0400803 .evict_inode = ext3_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 .put_super = ext3_put_super,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 .sync_fs = ext3_sync_fs,
Takashi Satoc4be0c12009-01-09 16:40:58 -0800806 .freeze_fs = ext3_freeze,
807 .unfreeze_fs = ext3_unfreeze,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 .statfs = ext3_statfs,
809 .remount_fs = ext3_remount,
Mark Bellon8fc27512005-09-06 15:16:54 -0700810 .show_options = ext3_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811#ifdef CONFIG_QUOTA
812 .quota_read = ext3_quota_read,
813 .quota_write = ext3_quota_write,
Jan Kara4018cfb2014-09-25 16:52:38 +0200814 .get_dquots = ext3_get_dquots,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815#endif
Toshiyuki Okajima6b082b52009-01-05 22:38:14 -0500816 .bdev_try_to_free_page = bdev_try_to_free_page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817};
818
Christoph Hellwig39655162007-10-21 16:42:17 -0700819static const struct export_operations ext3_export_ops = {
Christoph Hellwig74af0ba2007-10-21 16:42:07 -0700820 .fh_to_dentry = ext3_fh_to_dentry,
821 .fh_to_parent = ext3_fh_to_parent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 .get_parent = ext3_get_parent,
823};
824
825enum {
826 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
827 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Adrian Bunk2860b732005-11-08 21:34:59 -0800828 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Badari Pulavartyade1a292006-06-26 00:25:04 -0700830 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
Johann Lombardi71b96252006-01-08 01:03:20 -0800831 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
Eric Sandeencf7eff42013-07-31 14:33:00 -0500832 Opt_journal_path,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -0700834 Opt_data_err_abort, Opt_data_err_ignore,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara1aeec432009-11-30 22:22:41 +0100836 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Eric Sandeen0636c732010-04-30 11:09:34 -0500837 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
838 Opt_resize, Opt_usrquota, Opt_grpquota
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839};
840
Steven Whitehousea447c092008-10-13 10:46:57 +0100841static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 {Opt_bsd_df, "bsddf"},
843 {Opt_minix_df, "minixdf"},
844 {Opt_grpid, "grpid"},
845 {Opt_grpid, "bsdgroups"},
846 {Opt_nogrpid, "nogrpid"},
847 {Opt_nogrpid, "sysvgroups"},
848 {Opt_resgid, "resgid=%u"},
849 {Opt_resuid, "resuid=%u"},
850 {Opt_sb, "sb=%u"},
851 {Opt_err_cont, "errors=continue"},
852 {Opt_err_panic, "errors=panic"},
853 {Opt_err_ro, "errors=remount-ro"},
854 {Opt_nouid32, "nouid32"},
855 {Opt_nocheck, "nocheck"},
856 {Opt_nocheck, "check=none"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 {Opt_debug, "debug"},
858 {Opt_oldalloc, "oldalloc"},
859 {Opt_orlov, "orlov"},
860 {Opt_user_xattr, "user_xattr"},
861 {Opt_nouser_xattr, "nouser_xattr"},
862 {Opt_acl, "acl"},
863 {Opt_noacl, "noacl"},
864 {Opt_reservation, "reservation"},
865 {Opt_noreservation, "noreservation"},
866 {Opt_noload, "noload"},
Eric Sandeendee1d3b2009-11-16 16:50:49 -0600867 {Opt_noload, "norecovery"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 {Opt_nobh, "nobh"},
Badari Pulavartyade1a292006-06-26 00:25:04 -0700869 {Opt_bh, "bh"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 {Opt_commit, "commit=%u"},
871 {Opt_journal_update, "journal=update"},
872 {Opt_journal_inum, "journal=%u"},
Johann Lombardi71b96252006-01-08 01:03:20 -0800873 {Opt_journal_dev, "journal_dev=%u"},
Eric Sandeencf7eff42013-07-31 14:33:00 -0500874 {Opt_journal_path, "journal_path=%s"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 {Opt_abort, "abort"},
876 {Opt_data_journal, "data=journal"},
877 {Opt_data_ordered, "data=ordered"},
878 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -0700879 {Opt_data_err_abort, "data_err=abort"},
880 {Opt_data_err_ignore, "data_err=ignore"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 {Opt_offusrjquota, "usrjquota="},
882 {Opt_usrjquota, "usrjquota=%s"},
883 {Opt_offgrpjquota, "grpjquota="},
884 {Opt_grpjquota, "grpjquota=%s"},
885 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
886 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Jan Kara1aeec432009-11-30 22:22:41 +0100887 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700888 {Opt_grpquota, "grpquota"},
Jan Kara1f545872005-06-23 22:01:04 -0700889 {Opt_noquota, "noquota"},
890 {Opt_quota, "quota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700891 {Opt_usrquota, "usrquota"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 {Opt_barrier, "barrier=%u"},
Eric Sandeen0636c732010-04-30 11:09:34 -0500893 {Opt_barrier, "barrier"},
894 {Opt_nobarrier, "nobarrier"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 {Opt_resize, "resize"},
Josef Bacik925872162008-03-04 14:29:43 -0800896 {Opt_err, NULL},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897};
898
Alexey Fisher4cf46b62009-11-22 20:38:55 +0100899static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
Dave Kleikampe9ad5622006-09-27 01:49:35 -0700901 ext3_fsblk_t sb_block;
902 char *options = (char *) *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 if (!options || strncmp(options, "sb=", 3) != 0)
905 return 1; /* Default location */
906 options += 3;
Mingming Cao43d23f92006-06-25 05:48:07 -0700907 /*todo: use simple_strtoll with >32bit ext3 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 sb_block = simple_strtoul(options, &options, 0);
909 if (*options && *options != ',') {
Lars-Peter Clausen8d0c2d12013-03-09 15:28:44 +0100910 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 (char *) *data);
912 return 1;
913 }
914 if (*options == ',')
915 options++;
916 *data = (void *) options;
917 return sb_block;
918}
919
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300920#ifdef CONFIG_QUOTA
921static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
922{
923 struct ext3_sb_info *sbi = EXT3_SB(sb);
924 char *qname;
925
926 if (sb_any_quota_loaded(sb) &&
927 !sbi->s_qf_names[qtype]) {
928 ext3_msg(sb, KERN_ERR,
929 "Cannot change journaled "
930 "quota options when quota turned on");
931 return 0;
932 }
933 qname = match_strdup(args);
934 if (!qname) {
935 ext3_msg(sb, KERN_ERR,
936 "Not enough memory for storing quotafile name");
937 return 0;
938 }
Jan Karaf56426a2012-12-31 12:38:36 +0100939 if (sbi->s_qf_names[qtype]) {
940 int same = !strcmp(sbi->s_qf_names[qtype], qname);
941
942 kfree(qname);
943 if (!same) {
944 ext3_msg(sb, KERN_ERR,
945 "%s quota file already specified",
946 QTYPE2NAME(qtype));
947 }
948 return same;
949 }
950 if (strchr(qname, '/')) {
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300951 ext3_msg(sb, KERN_ERR,
Jan Karaf56426a2012-12-31 12:38:36 +0100952 "quotafile must be on filesystem root");
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300953 kfree(qname);
954 return 0;
955 }
956 sbi->s_qf_names[qtype] = qname;
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300957 set_opt(sbi->s_mount_opt, QUOTA);
958 return 1;
959}
960
961static int clear_qf_name(struct super_block *sb, int qtype) {
962
963 struct ext3_sb_info *sbi = EXT3_SB(sb);
964
965 if (sb_any_quota_loaded(sb) &&
966 sbi->s_qf_names[qtype]) {
967 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
968 " when quota turned on");
969 return 0;
970 }
Jan Karaf56426a2012-12-31 12:38:36 +0100971 if (sbi->s_qf_names[qtype]) {
972 kfree(sbi->s_qf_names[qtype]);
973 sbi->s_qf_names[qtype] = NULL;
974 }
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300975 return 1;
976}
977#endif
978
Johann Lombardi71b96252006-01-08 01:03:20 -0800979static int parse_options (char *options, struct super_block *sb,
Eric Sandeeneee194e2006-09-27 01:49:30 -0700980 unsigned int *inum, unsigned long *journal_devnum,
Mingming Cao43d23f92006-06-25 05:48:07 -0700981 ext3_fsblk_t *n_blocks_count, int is_remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982{
983 struct ext3_sb_info *sbi = EXT3_SB(sb);
984 char * p;
985 substring_t args[MAX_OPT_ARGS];
986 int data_opt = 0;
987 int option;
Eric W. Biederman15232992012-02-07 15:41:24 -0800988 kuid_t uid;
989 kgid_t gid;
Eric Sandeencf7eff42013-07-31 14:33:00 -0500990 char *journal_path;
991 struct inode *journal_inode;
992 struct path path;
993 int error;
994
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995#ifdef CONFIG_QUOTA
Dmitry Monakhove1f5c672010-02-02 16:05:53 +0300996 int qfmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997#endif
998
999 if (!options)
1000 return 1;
1001
1002 while ((p = strsep (&options, ",")) != NULL) {
1003 int token;
1004 if (!*p)
1005 continue;
Eric Sandeen0636c732010-04-30 11:09:34 -05001006 /*
1007 * Initialize args struct so we know whether arg was
1008 * found; some options take optional arguments.
1009 */
Sachin Kamat76f59b32012-09-04 13:42:00 +05301010 args[0].to = args[0].from = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 token = match_token(p, tokens, args);
1012 switch (token) {
1013 case Opt_bsd_df:
1014 clear_opt (sbi->s_mount_opt, MINIX_DF);
1015 break;
1016 case Opt_minix_df:
1017 set_opt (sbi->s_mount_opt, MINIX_DF);
1018 break;
1019 case Opt_grpid:
1020 set_opt (sbi->s_mount_opt, GRPID);
1021 break;
1022 case Opt_nogrpid:
1023 clear_opt (sbi->s_mount_opt, GRPID);
1024 break;
1025 case Opt_resuid:
1026 if (match_int(&args[0], &option))
1027 return 0;
Eric W. Biederman15232992012-02-07 15:41:24 -08001028 uid = make_kuid(current_user_ns(), option);
1029 if (!uid_valid(uid)) {
1030 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
Zhao Hongjiang66415f62012-10-09 13:48:47 +08001031 return 0;
Eric W. Biederman15232992012-02-07 15:41:24 -08001032
1033 }
1034 sbi->s_resuid = uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 break;
1036 case Opt_resgid:
1037 if (match_int(&args[0], &option))
1038 return 0;
Eric W. Biederman15232992012-02-07 15:41:24 -08001039 gid = make_kgid(current_user_ns(), option);
1040 if (!gid_valid(gid)) {
1041 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
Zhao Hongjiang66415f62012-10-09 13:48:47 +08001042 return 0;
Eric W. Biederman15232992012-02-07 15:41:24 -08001043 }
1044 sbi->s_resgid = gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 break;
1046 case Opt_sb:
1047 /* handled by get_sb_block() instead of here */
1048 /* *sb_block = match_int(&args[0]); */
1049 break;
1050 case Opt_err_panic:
1051 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1052 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1053 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1054 break;
1055 case Opt_err_ro:
1056 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1057 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1058 set_opt (sbi->s_mount_opt, ERRORS_RO);
1059 break;
1060 case Opt_err_cont:
1061 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1062 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1063 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1064 break;
1065 case Opt_nouid32:
1066 set_opt (sbi->s_mount_opt, NO_UID32);
1067 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 case Opt_nocheck:
1069 clear_opt (sbi->s_mount_opt, CHECK);
1070 break;
1071 case Opt_debug:
1072 set_opt (sbi->s_mount_opt, DEBUG);
1073 break;
1074 case Opt_oldalloc:
Lukas Czernerfbc85402011-08-16 18:08:06 +02001075 ext3_msg(sb, KERN_WARNING,
1076 "Ignoring deprecated oldalloc option");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 break;
1078 case Opt_orlov:
Lukas Czernerfbc85402011-08-16 18:08:06 +02001079 ext3_msg(sb, KERN_WARNING,
1080 "Ignoring deprecated orlov option");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 break;
1082#ifdef CONFIG_EXT3_FS_XATTR
1083 case Opt_user_xattr:
1084 set_opt (sbi->s_mount_opt, XATTR_USER);
1085 break;
1086 case Opt_nouser_xattr:
1087 clear_opt (sbi->s_mount_opt, XATTR_USER);
1088 break;
1089#else
1090 case Opt_user_xattr:
1091 case Opt_nouser_xattr:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001092 ext3_msg(sb, KERN_INFO,
1093 "(no)user_xattr options not supported");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 break;
1095#endif
1096#ifdef CONFIG_EXT3_FS_POSIX_ACL
1097 case Opt_acl:
1098 set_opt(sbi->s_mount_opt, POSIX_ACL);
1099 break;
1100 case Opt_noacl:
1101 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1102 break;
1103#else
1104 case Opt_acl:
1105 case Opt_noacl:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001106 ext3_msg(sb, KERN_INFO,
1107 "(no)acl options not supported");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 break;
1109#endif
1110 case Opt_reservation:
1111 set_opt(sbi->s_mount_opt, RESERVATION);
1112 break;
1113 case Opt_noreservation:
1114 clear_opt(sbi->s_mount_opt, RESERVATION);
1115 break;
1116 case Opt_journal_update:
1117 /* @@@ FIXME */
1118 /* Eventually we will want to be able to create
1119 a journal file here. For now, only allow the
1120 user to specify an existing inode to be the
1121 journal file. */
1122 if (is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001123 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1124 "journal on remount");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 return 0;
1126 }
1127 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1128 break;
1129 case Opt_journal_inum:
1130 if (is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001131 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1132 "journal on remount");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 return 0;
1134 }
1135 if (match_int(&args[0], &option))
1136 return 0;
1137 *inum = option;
1138 break;
Johann Lombardi71b96252006-01-08 01:03:20 -08001139 case Opt_journal_dev:
1140 if (is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001141 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1142 "journal on remount");
Johann Lombardi71b96252006-01-08 01:03:20 -08001143 return 0;
1144 }
1145 if (match_int(&args[0], &option))
1146 return 0;
1147 *journal_devnum = option;
1148 break;
Eric Sandeencf7eff42013-07-31 14:33:00 -05001149 case Opt_journal_path:
1150 if (is_remount) {
1151 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1152 "journal on remount");
1153 return 0;
1154 }
1155
1156 journal_path = match_strdup(&args[0]);
1157 if (!journal_path) {
1158 ext3_msg(sb, KERN_ERR, "error: could not dup "
1159 "journal device string");
1160 return 0;
1161 }
1162
1163 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1164 if (error) {
1165 ext3_msg(sb, KERN_ERR, "error: could not find "
1166 "journal device path: error %d", error);
1167 kfree(journal_path);
1168 return 0;
1169 }
1170
1171 journal_inode = path.dentry->d_inode;
1172 if (!S_ISBLK(journal_inode->i_mode)) {
1173 ext3_msg(sb, KERN_ERR, "error: journal path %s "
1174 "is not a block device", journal_path);
1175 path_put(&path);
1176 kfree(journal_path);
1177 return 0;
1178 }
1179
1180 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1181 path_put(&path);
1182 kfree(journal_path);
1183 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 case Opt_noload:
1185 set_opt (sbi->s_mount_opt, NOLOAD);
1186 break;
1187 case Opt_commit:
1188 if (match_int(&args[0], &option))
1189 return 0;
1190 if (option < 0)
1191 return 0;
1192 if (option == 0)
1193 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1194 sbi->s_commit_interval = HZ * option;
1195 break;
1196 case Opt_data_journal:
1197 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1198 goto datacheck;
1199 case Opt_data_ordered:
1200 data_opt = EXT3_MOUNT_ORDERED_DATA;
1201 goto datacheck;
1202 case Opt_data_writeback:
1203 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1204 datacheck:
1205 if (is_remount) {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001206 if (test_opt(sb, DATA_FLAGS) == data_opt)
Jan Kara3c4cec62009-08-24 16:38:43 +02001207 break;
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001208 ext3_msg(sb, KERN_ERR,
1209 "error: cannot change "
Jan Kara3c4cec62009-08-24 16:38:43 +02001210 "data mode on remount. The filesystem "
1211 "is mounted in data=%s mode and you "
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001212 "try to remount it in data=%s mode.",
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001213 data_mode_string(test_opt(sb,
1214 DATA_FLAGS)),
Jan Kara3c4cec62009-08-24 16:38:43 +02001215 data_mode_string(data_opt));
1216 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 } else {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001218 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 sbi->s_mount_opt |= data_opt;
1220 }
1221 break;
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -07001222 case Opt_data_err_abort:
1223 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1224 break;
1225 case Opt_data_err_ignore:
1226 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1227 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228#ifdef CONFIG_QUOTA
1229 case Opt_usrjquota:
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001230 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1231 return 0;
1232 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 case Opt_grpjquota:
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001234 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 break;
1237 case Opt_offusrjquota:
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001238 if (!clear_qf_name(sb, USRQUOTA))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 return 0;
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001240 break;
1241 case Opt_offgrpjquota:
1242 if (!clear_qf_name(sb, GRPQUOTA))
1243 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 break;
1245 case Opt_jqfmt_vfsold:
Jan Karad06bf1d2008-07-25 01:46:18 -07001246 qfmt = QFMT_VFS_OLD;
1247 goto set_qf_format;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 case Opt_jqfmt_vfsv0:
Jan Karad06bf1d2008-07-25 01:46:18 -07001249 qfmt = QFMT_VFS_V0;
Jan Kara1aeec432009-11-30 22:22:41 +01001250 goto set_qf_format;
1251 case Opt_jqfmt_vfsv1:
1252 qfmt = QFMT_VFS_V1;
Jan Karad06bf1d2008-07-25 01:46:18 -07001253set_qf_format:
Jan Karaee0d5ff2008-08-20 18:11:50 +02001254 if (sb_any_quota_loaded(sb) &&
Jan Karad06bf1d2008-07-25 01:46:18 -07001255 sbi->s_jquota_fmt != qfmt) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001256 ext3_msg(sb, KERN_ERR, "error: cannot change "
Jan Karad06bf1d2008-07-25 01:46:18 -07001257 "journaled quota options when "
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001258 "quota turned on.");
Jan Karad06bf1d2008-07-25 01:46:18 -07001259 return 0;
1260 }
1261 sbi->s_jquota_fmt = qfmt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 break;
Jan Kara1f545872005-06-23 22:01:04 -07001263 case Opt_quota:
Mark Bellon8fc27512005-09-06 15:16:54 -07001264 case Opt_usrquota:
Jan Kara1f545872005-06-23 22:01:04 -07001265 set_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -07001266 set_opt(sbi->s_mount_opt, USRQUOTA);
1267 break;
1268 case Opt_grpquota:
1269 set_opt(sbi->s_mount_opt, QUOTA);
1270 set_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -07001271 break;
1272 case Opt_noquota:
Jan Karaee0d5ff2008-08-20 18:11:50 +02001273 if (sb_any_quota_loaded(sb)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001274 ext3_msg(sb, KERN_ERR, "error: cannot change "
1275 "quota options when quota turned on.");
Jan Kara1f545872005-06-23 22:01:04 -07001276 return 0;
1277 }
1278 clear_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -07001279 clear_opt(sbi->s_mount_opt, USRQUOTA);
1280 clear_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -07001281 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282#else
Mark Bellon8fc27512005-09-06 15:16:54 -07001283 case Opt_quota:
1284 case Opt_usrquota:
1285 case Opt_grpquota:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001286 ext3_msg(sb, KERN_ERR,
1287 "error: quota options not supported.");
Jan Karafa1ff1e2008-04-28 02:16:14 -07001288 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 case Opt_usrjquota:
1290 case Opt_grpjquota:
1291 case Opt_offusrjquota:
1292 case Opt_offgrpjquota:
1293 case Opt_jqfmt_vfsold:
1294 case Opt_jqfmt_vfsv0:
Jan Kara1aeec432009-11-30 22:22:41 +01001295 case Opt_jqfmt_vfsv1:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001296 ext3_msg(sb, KERN_ERR,
1297 "error: journaled quota options not "
1298 "supported.");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 break;
Jan Kara1f545872005-06-23 22:01:04 -07001300 case Opt_noquota:
1301 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302#endif
1303 case Opt_abort:
1304 set_opt(sbi->s_mount_opt, ABORT);
1305 break;
Eric Sandeen0636c732010-04-30 11:09:34 -05001306 case Opt_nobarrier:
1307 clear_opt(sbi->s_mount_opt, BARRIER);
1308 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 case Opt_barrier:
Eric Sandeen0636c732010-04-30 11:09:34 -05001310 if (args[0].from) {
1311 if (match_int(&args[0], &option))
1312 return 0;
1313 } else
1314 option = 1; /* No argument, default to 1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 if (option)
1316 set_opt(sbi->s_mount_opt, BARRIER);
1317 else
1318 clear_opt(sbi->s_mount_opt, BARRIER);
1319 break;
1320 case Opt_ignore:
1321 break;
1322 case Opt_resize:
Jan Kara08c6a962005-07-12 13:58:28 -07001323 if (!is_remount) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001324 ext3_msg(sb, KERN_ERR,
1325 "error: resize option only available "
1326 "for remount");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 return 0;
1328 }
KAMBAROV, ZAURc7f17212005-06-28 20:45:11 -07001329 if (match_int(&args[0], &option) != 0)
1330 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 *n_blocks_count = option;
1332 break;
1333 case Opt_nobh:
Christoph Hellwig4c4d3902010-06-07 10:20:39 +02001334 ext3_msg(sb, KERN_WARNING,
1335 "warning: ignoring deprecated nobh option");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 break;
Badari Pulavartyade1a292006-06-26 00:25:04 -07001337 case Opt_bh:
Christoph Hellwig4c4d3902010-06-07 10:20:39 +02001338 ext3_msg(sb, KERN_WARNING,
1339 "warning: ignoring deprecated bh option");
Badari Pulavartyade1a292006-06-26 00:25:04 -07001340 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 default:
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001342 ext3_msg(sb, KERN_ERR,
1343 "error: unrecognized mount option \"%s\" "
1344 "or missing value", p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 return 0;
1346 }
1347 }
1348#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -07001349 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001350 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
Mark Bellon8fc27512005-09-06 15:16:54 -07001351 clear_opt(sbi->s_mount_opt, USRQUOTA);
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001352 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
Mark Bellon8fc27512005-09-06 15:16:54 -07001353 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1354
Dmitry Monakhove1f5c672010-02-02 16:05:53 +03001355 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001356 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1357 "format mixing.");
Mark Bellon8fc27512005-09-06 15:16:54 -07001358 return 0;
1359 }
1360
1361 if (!sbi->s_jquota_fmt) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001362 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1363 "not specified.");
Mark Bellon8fc27512005-09-06 15:16:54 -07001364 return 0;
1365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 }
1367#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 return 1;
1369}
1370
1371static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1372 int read_only)
1373{
1374 struct ext3_sb_info *sbi = EXT3_SB(sb);
1375 int res = 0;
1376
1377 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001378 ext3_msg(sb, KERN_ERR,
1379 "error: revision level too high, "
1380 "forcing read-only mode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 res = MS_RDONLY;
1382 }
1383 if (read_only)
1384 return res;
1385 if (!(sbi->s_mount_state & EXT3_VALID_FS))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001386 ext3_msg(sb, KERN_WARNING,
1387 "warning: mounting unchecked fs, "
1388 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001390 ext3_msg(sb, KERN_WARNING,
1391 "warning: mounting fs with errors, "
1392 "running e2fsck is recommended");
Namhyung Kimdf0d6b82010-10-10 21:36:59 +09001393 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 le16_to_cpu(es->s_mnt_count) >=
Namhyung Kimdf0d6b82010-10-10 21:36:59 +09001395 le16_to_cpu(es->s_max_mnt_count))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001396 ext3_msg(sb, KERN_WARNING,
1397 "warning: maximal mount count reached, "
1398 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 else if (le32_to_cpu(es->s_checkinterval) &&
1400 (le32_to_cpu(es->s_lastcheck) +
1401 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001402 ext3_msg(sb, KERN_WARNING,
1403 "warning: checktime reached, "
1404 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405#if 0
1406 /* @@@ We _will_ want to clear the valid bit if we find
1407 inconsistencies, to force a fsck at reboot. But for
1408 a plain journaled filesystem we can keep it set as
1409 valid forever! :) */
Marcin Slusarze7f23eb2008-04-28 02:16:06 -07001410 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411#endif
Namhyung Kimdf0d6b82010-10-10 21:36:59 +09001412 if (!le16_to_cpu(es->s_max_mnt_count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
Marcin Slusarz50e8a282008-02-08 04:20:13 -08001414 le16_add_cpu(&es->s_mnt_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 es->s_mtime = cpu_to_le32(get_seconds());
1416 ext3_update_dynamic_rev(sb);
1417 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1418
1419 ext3_commit_super(sb, es, 1);
1420 if (test_opt(sb, DEBUG))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001421 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1422 "bpg=%lu, ipg=%lu, mo=%04lx]",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 sb->s_blocksize,
1424 sbi->s_groups_count,
1425 EXT3_BLOCKS_PER_GROUP(sb),
1426 EXT3_INODES_PER_GROUP(sb),
1427 sbi->s_mount_opt);
1428
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1430 char b[BDEVNAME_SIZE];
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001431 ext3_msg(sb, KERN_INFO, "using external journal on %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1433 } else {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001434 ext3_msg(sb, KERN_INFO, "using internal journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 }
Dan Magenheimerd71bc6d2011-05-26 10:01:49 -06001436 cleancache_init_fs(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 return res;
1438}
1439
1440/* Called at mount-time, super-block is locked */
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001441static int ext3_check_descriptors(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442{
1443 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 int i;
1445
1446 ext3_debug ("Checking group descriptors");
1447
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001448 for (i = 0; i < sbi->s_groups_count; i++) {
1449 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
Akinobu Mita1eaafea2008-04-28 02:16:07 -07001450 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1451 ext3_fsblk_t last_block;
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001452
Eric Sandeen855565e2006-09-27 01:49:29 -07001453 if (i == sbi->s_groups_count - 1)
1454 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1455 else
1456 last_block = first_block +
1457 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1458
Eric Sandeen855565e2006-09-27 01:49:29 -07001459 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1460 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 {
1462 ext3_error (sb, "ext3_check_descriptors",
1463 "Block bitmap for group %d"
1464 " not in group (block %lu)!",
1465 i, (unsigned long)
1466 le32_to_cpu(gdp->bg_block_bitmap));
1467 return 0;
1468 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001469 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1470 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 {
1472 ext3_error (sb, "ext3_check_descriptors",
1473 "Inode bitmap for group %d"
1474 " not in group (block %lu)!",
1475 i, (unsigned long)
1476 le32_to_cpu(gdp->bg_inode_bitmap));
1477 return 0;
1478 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001479 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
Eric Sandeen780dcdb2007-07-26 10:41:11 -07001480 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
Eric Sandeen855565e2006-09-27 01:49:29 -07001481 last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 {
1483 ext3_error (sb, "ext3_check_descriptors",
1484 "Inode table for group %d"
1485 " not in group (block %lu)!",
1486 i, (unsigned long)
1487 le32_to_cpu(gdp->bg_inode_table));
1488 return 0;
1489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 }
1491
1492 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1493 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1494 return 1;
1495}
1496
1497
1498/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1499 * the superblock) which were deleted from all directories, but held open by
1500 * a process at the time of a crash. We walk the list and try to delete these
1501 * inodes at recovery time (only with a read-write filesystem).
1502 *
1503 * In order to keep the orphan inode chain consistent during traversal (in
1504 * case of crash during recovery), we link each inode into the superblock
1505 * orphan list_head and handle it the same way as an inode deletion during
1506 * normal operation (which journals the operations for us).
1507 *
1508 * We only do an iget() and an iput() on each inode, which is very safe if we
1509 * accidentally point at an in-use or already deleted inode. The worst that
1510 * can happen in this case is that we get a "bit already cleared" message from
1511 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1512 * e2fsck was run on this filesystem, and it must have already done the orphan
1513 * inode cleanup for us, so we can safely abort without any further action.
1514 */
1515static void ext3_orphan_cleanup (struct super_block * sb,
1516 struct ext3_super_block * es)
1517{
1518 unsigned int s_flags = sb->s_flags;
1519 int nr_orphans = 0, nr_truncates = 0;
1520#ifdef CONFIG_QUOTA
1521 int i;
1522#endif
1523 if (!es->s_last_orphan) {
1524 jbd_debug(4, "no orphan inodes to clean up\n");
1525 return;
1526 }
1527
Eric Sandeena8f48a92006-12-06 20:40:13 -08001528 if (bdev_read_only(sb->s_bdev)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001529 ext3_msg(sb, KERN_ERR, "error: write access "
1530 "unavailable, skipping orphan cleanup.");
Eric Sandeena8f48a92006-12-06 20:40:13 -08001531 return;
1532 }
1533
Amir Goldsteince654b32011-02-26 22:40:19 +02001534 /* Check if feature set allows readwrite operations */
1535 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1536 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1537 "unknown ROCOMPAT features");
1538 return;
1539 }
1540
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
Eric Sandeene4230102012-08-27 14:30:40 -05001542 /* don't clear list on RO mount w/ errors */
1543 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 jbd_debug(1, "Errors on filesystem, "
1545 "clearing orphan list.\n");
Eric Sandeene4230102012-08-27 14:30:40 -05001546 es->s_last_orphan = 0;
1547 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1549 return;
1550 }
1551
1552 if (s_flags & MS_RDONLY) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001553 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 sb->s_flags &= ~MS_RDONLY;
1555 }
1556#ifdef CONFIG_QUOTA
1557 /* Needed for iput() to work correctly and not trash data */
1558 sb->s_flags |= MS_ACTIVE;
1559 /* Turn on quotas so that they are updated correctly */
Jan Karaa93114e2014-09-10 20:48:02 +02001560 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 if (EXT3_SB(sb)->s_qf_names[i]) {
1562 int ret = ext3_quota_on_mount(sb, i);
1563 if (ret < 0)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001564 ext3_msg(sb, KERN_ERR,
1565 "error: cannot turn on journaled "
1566 "quota: %d", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 }
1568 }
1569#endif
1570
1571 while (es->s_last_orphan) {
1572 struct inode *inode;
1573
David Howells473043d2008-02-07 00:15:36 -08001574 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1575 if (IS_ERR(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 es->s_last_orphan = 0;
1577 break;
1578 }
1579
1580 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
Christoph Hellwig871a2932010-03-03 09:05:07 -05001581 dquot_initialize(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 if (inode->i_nlink) {
1583 printk(KERN_DEBUG
Eric Sandeeneee194e2006-09-27 01:49:30 -07001584 "%s: truncating inode %lu to %Ld bytes\n",
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001585 __func__, inode->i_ino, inode->i_size);
Eric Sandeeneee194e2006-09-27 01:49:30 -07001586 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 inode->i_ino, inode->i_size);
1588 ext3_truncate(inode);
1589 nr_truncates++;
1590 } else {
1591 printk(KERN_DEBUG
Eric Sandeeneee194e2006-09-27 01:49:30 -07001592 "%s: deleting unreferenced inode %lu\n",
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001593 __func__, inode->i_ino);
Eric Sandeeneee194e2006-09-27 01:49:30 -07001594 jbd_debug(2, "deleting unreferenced inode %lu\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 inode->i_ino);
1596 nr_orphans++;
1597 }
1598 iput(inode); /* The delete magic happens here! */
1599 }
1600
1601#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1602
1603 if (nr_orphans)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001604 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1605 PLURAL(nr_orphans));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 if (nr_truncates)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001607 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1608 PLURAL(nr_truncates));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609#ifdef CONFIG_QUOTA
1610 /* Turn quotas off */
Jan Karaa93114e2014-09-10 20:48:02 +02001611 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 if (sb_dqopt(sb)->files[i])
Christoph Hellwig287a8092010-05-19 07:16:45 -04001613 dquot_quota_off(sb, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 }
1615#endif
1616 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1617}
1618
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619/*
1620 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1621 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1622 * We need to be 1 filesystem block less than the 2^32 sector limit.
1623 */
1624static loff_t ext3_max_size(int bits)
1625{
1626 loff_t res = EXT3_NDIR_BLOCKS;
Aneesh Kumar K.Vfe7fdc32008-01-28 23:58:26 -05001627 int meta_blocks;
1628 loff_t upper_limit;
1629
1630 /* This is calculated to be the largest file size for a
1631 * dense, file such that the total number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 * sectors in the file, including data and all indirect blocks,
Aneesh Kumar K.Vfe7fdc32008-01-28 23:58:26 -05001633 * does not exceed 2^32 -1
1634 * __u32 i_blocks representing the total number of
1635 * 512 bytes blocks of the file
1636 */
1637 upper_limit = (1LL << 32) - 1;
1638
1639 /* total blocks in file system block size */
1640 upper_limit >>= (bits - 9);
1641
1642
1643 /* indirect blocks */
1644 meta_blocks = 1;
1645 /* double indirect blocks */
1646 meta_blocks += 1 + (1LL << (bits-2));
1647 /* tripple indirect blocks */
1648 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1649
1650 upper_limit -= meta_blocks;
1651 upper_limit <<= bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652
1653 res += 1LL << (bits-2);
1654 res += 1LL << (2*(bits-2));
1655 res += 1LL << (3*(bits-2));
1656 res <<= bits;
1657 if (res > upper_limit)
1658 res = upper_limit;
Aneesh Kumar K.Vfe7fdc32008-01-28 23:58:26 -05001659
1660 if (res > MAX_LFS_FILESIZE)
1661 res = MAX_LFS_FILESIZE;
1662
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 return res;
1664}
1665
Mingming Cao43d23f92006-06-25 05:48:07 -07001666static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1667 ext3_fsblk_t logic_sb_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 int nr)
1669{
1670 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001671 unsigned long bg, first_meta_bg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 int has_super = 0;
1673
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1675
1676 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1677 nr < first_meta_bg)
1678 return (logic_sb_block + nr + 1);
1679 bg = sbi->s_desc_per_block * nr;
1680 if (ext3_bg_has_super(sb, bg))
1681 has_super = 1;
Mingming Cao43d23f92006-06-25 05:48:07 -07001682 return (has_super + ext3_group_first_block_no(sb, bg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683}
1684
1685
1686static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1687{
1688 struct buffer_head * bh;
1689 struct ext3_super_block *es = NULL;
1690 struct ext3_sb_info *sbi;
Mingming Cao43d23f92006-06-25 05:48:07 -07001691 ext3_fsblk_t block;
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001692 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001693 ext3_fsblk_t logic_sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 unsigned long offset = 0;
Eric Sandeeneee194e2006-09-27 01:49:30 -07001695 unsigned int journal_inum = 0;
Johann Lombardi71b96252006-01-08 01:03:20 -08001696 unsigned long journal_devnum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 unsigned long def_mount_opts;
1698 struct inode *root;
1699 int blocksize;
1700 int hblock;
1701 int db_count;
1702 int i;
1703 int needs_recovery;
David Howells473043d2008-02-07 00:15:36 -08001704 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 __le32 features;
Peter Zijlstra833f4072007-10-16 23:25:45 -07001706 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -07001708 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 if (!sbi)
1710 return -ENOMEM;
Pekka Enberg5df096d2009-01-07 18:07:25 -08001711
1712 sbi->s_blockgroup_lock =
1713 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1714 if (!sbi->s_blockgroup_lock) {
1715 kfree(sbi);
1716 return -ENOMEM;
1717 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 sb->s_fs_info = sbi;
Miklos Szeredi571beed2007-10-16 23:26:26 -07001719 sbi->s_sb_block = sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1722 if (!blocksize) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001723 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 goto out_fail;
1725 }
1726
1727 /*
1728 * The ext3 superblock will not be buffer aligned for other than 1kB
1729 * block sizes. We need to calculate the offset from buffer start.
1730 */
1731 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1732 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1733 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1734 } else {
1735 logic_sb_block = sb_block;
1736 }
1737
1738 if (!(bh = sb_bread(sb, logic_sb_block))) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001739 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 goto out_fail;
1741 }
1742 /*
1743 * Note: s_es must be initialized as soon as possible because
1744 * some ext3 macro-instructions depend on its value
1745 */
Namhyung Kim57e94d82010-10-11 02:10:45 +09001746 es = (struct ext3_super_block *) (bh->b_data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 sbi->s_es = es;
1748 sb->s_magic = le16_to_cpu(es->s_magic);
1749 if (sb->s_magic != EXT3_SUPER_MAGIC)
1750 goto cantfind_ext3;
1751
1752 /* Set defaults before we parse the mount options */
1753 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1754 if (def_mount_opts & EXT3_DEFM_DEBUG)
1755 set_opt(sbi->s_mount_opt, DEBUG);
1756 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1757 set_opt(sbi->s_mount_opt, GRPID);
1758 if (def_mount_opts & EXT3_DEFM_UID16)
1759 set_opt(sbi->s_mount_opt, NO_UID32);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001760#ifdef CONFIG_EXT3_FS_XATTR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1762 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001763#endif
1764#ifdef CONFIG_EXT3_FS_POSIX_ACL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765 if (def_mount_opts & EXT3_DEFM_ACL)
1766 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001767#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001769 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001771 set_opt(sbi->s_mount_opt, ORDERED_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001773 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774
1775 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1776 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -08001777 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
Dmitry Mishin2245d7c2006-10-11 01:21:49 -07001778 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Aneesh Kumar K.V1eca93f2008-02-06 01:40:14 -08001779 else
1780 set_opt(sbi->s_mount_opt, ERRORS_RO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
Eric W. Biederman15232992012-02-07 15:41:24 -08001782 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1783 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784
Christoph Hellwig00eacd62011-07-16 16:46:50 -04001785 /* enable barriers by default */
1786 set_opt(sbi->s_mount_opt, BARRIER);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 set_opt(sbi->s_mount_opt, RESERVATION);
1788
Johann Lombardi71b96252006-01-08 01:03:20 -08001789 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1790 NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 goto failed_mount;
1792
1793 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhove3c96432010-02-02 16:05:51 +03001794 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795
1796 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1797 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1798 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1799 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001800 ext3_msg(sb, KERN_WARNING,
1801 "warning: feature flags set on rev 0 fs, "
1802 "running e2fsck is recommended");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 /*
1804 * Check feature flags regardless of the revision level, since we
1805 * previously didn't change the revision level when setting the flags,
1806 * so there is a chance incompat flags are set on a rev 0 filesystem.
1807 */
1808 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1809 if (features) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001810 ext3_msg(sb, KERN_ERR,
1811 "error: couldn't mount because of unsupported "
1812 "optional features (%x)", le32_to_cpu(features));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 goto failed_mount;
1814 }
1815 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1816 if (!(sb->s_flags & MS_RDONLY) && features) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001817 ext3_msg(sb, KERN_ERR,
1818 "error: couldn't mount RDWR because of unsupported "
1819 "optional features (%x)", le32_to_cpu(features));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 goto failed_mount;
1821 }
1822 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1823
1824 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1825 blocksize > EXT3_MAX_BLOCK_SIZE) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001826 ext3_msg(sb, KERN_ERR,
1827 "error: couldn't mount because of unsupported "
1828 "filesystem blocksize %d", blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 goto failed_mount;
1830 }
1831
Martin K. Petersene1defc42009-05-22 17:17:49 -04001832 hblock = bdev_logical_block_size(sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 if (sb->s_blocksize != blocksize) {
1834 /*
1835 * Make sure the blocksize for the filesystem is larger
1836 * than the hardware sectorsize for the machine.
1837 */
1838 if (blocksize < hblock) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001839 ext3_msg(sb, KERN_ERR,
1840 "error: fsblocksize %d too small for "
1841 "hardware sectorsize %d", blocksize, hblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 goto failed_mount;
1843 }
1844
1845 brelse (bh);
Takashi Sato0f0a89e2007-10-18 03:06:56 -07001846 if (!sb_set_blocksize(sb, blocksize)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001847 ext3_msg(sb, KERN_ERR,
1848 "error: bad blocksize %d", blocksize);
Takashi Sato0f0a89e2007-10-18 03:06:56 -07001849 goto out_fail;
1850 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1852 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1853 bh = sb_bread(sb, logic_sb_block);
1854 if (!bh) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001855 ext3_msg(sb, KERN_ERR,
1856 "error: can't read superblock on 2nd try");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 goto failed_mount;
1858 }
Namhyung Kim57e94d82010-10-11 02:10:45 +09001859 es = (struct ext3_super_block *)(bh->b_data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 sbi->s_es = es;
1861 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001862 ext3_msg(sb, KERN_ERR,
1863 "error: magic mismatch");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 goto failed_mount;
1865 }
1866 }
1867
1868 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1869
1870 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1871 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1872 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1873 } else {
1874 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1875 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1876 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
vignesh babu3fc74262007-07-15 23:41:17 -07001877 (!is_power_of_2(sbi->s_inode_size)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 (sbi->s_inode_size > blocksize)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001879 ext3_msg(sb, KERN_ERR,
1880 "error: unsupported inode size: %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 sbi->s_inode_size);
1882 goto failed_mount;
1883 }
1884 }
1885 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1886 le32_to_cpu(es->s_log_frag_size);
1887 if (blocksize != sbi->s_frag_size) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001888 ext3_msg(sb, KERN_ERR,
1889 "error: fragsize %lu != blocksize %u (unsupported)",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 sbi->s_frag_size, blocksize);
1891 goto failed_mount;
1892 }
1893 sbi->s_frags_per_block = 1;
1894 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1895 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1896 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andries E. Brouwerb47b6f32007-12-17 16:19:55 -08001897 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 goto cantfind_ext3;
1899 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1900 if (sbi->s_inodes_per_block == 0)
1901 goto cantfind_ext3;
1902 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1903 sbi->s_inodes_per_block;
1904 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1905 sbi->s_sbh = bh;
1906 sbi->s_mount_state = le16_to_cpu(es->s_state);
David Howellsf0d1b0b2006-12-08 02:37:49 -08001907 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1908 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 for (i=0; i < 4; i++)
1910 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1911 sbi->s_def_hash_version = es->s_def_hash_version;
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -04001912 i = le32_to_cpu(es->s_flags);
1913 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1914 sbi->s_hash_unsigned = 3;
1915 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1916#ifdef __CHAR_UNSIGNED__
1917 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1918 sbi->s_hash_unsigned = 3;
1919#else
1920 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1921#endif
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -04001922 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923
1924 if (sbi->s_blocks_per_group > blocksize * 8) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001925 ext3_msg(sb, KERN_ERR,
1926 "#blocks per group too big: %lu",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 sbi->s_blocks_per_group);
1928 goto failed_mount;
1929 }
1930 if (sbi->s_frags_per_group > blocksize * 8) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001931 ext3_msg(sb, KERN_ERR,
1932 "error: #fragments per group too big: %lu",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 sbi->s_frags_per_group);
1934 goto failed_mount;
1935 }
1936 if (sbi->s_inodes_per_group > blocksize * 8) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001937 ext3_msg(sb, KERN_ERR,
1938 "error: #inodes per group too big: %lu",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 sbi->s_inodes_per_group);
1940 goto failed_mount;
1941 }
1942
Darrick J. Wongad692bf2010-11-16 22:57:44 +00001943 err = generic_check_addressable(sb->s_blocksize_bits,
1944 le32_to_cpu(es->s_blocks_count));
1945 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001946 ext3_msg(sb, KERN_ERR,
1947 "error: filesystem is too large to mount safely");
Mingming Caofcd5df32006-06-25 05:47:50 -07001948 if (sizeof(sector_t) < 8)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001949 ext3_msg(sb, KERN_ERR,
1950 "error: CONFIG_LBDAF not enabled");
Darrick J. Wongad692bf2010-11-16 22:57:44 +00001951 ret = err;
Mingming Caofcd5df32006-06-25 05:47:50 -07001952 goto failed_mount;
1953 }
1954
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1956 goto cantfind_ext3;
Eric Sandeen855565e2006-09-27 01:49:29 -07001957 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1958 le32_to_cpu(es->s_first_data_block) - 1)
1959 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
Namhyung Kim81a4e322010-10-11 19:38:39 +09001960 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1962 GFP_KERNEL);
1963 if (sbi->s_group_desc == NULL) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001964 ext3_msg(sb, KERN_ERR,
1965 "error: not enough memory");
Namhyung Kim4569cd12010-10-11 19:08:06 +09001966 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 goto failed_mount;
1968 }
1969
Pekka Enberg5df096d2009-01-07 18:07:25 -08001970 bgl_lock_init(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971
1972 for (i = 0; i < db_count; i++) {
1973 block = descriptor_loc(sb, logic_sb_block, i);
1974 sbi->s_group_desc[i] = sb_bread(sb, block);
1975 if (!sbi->s_group_desc[i]) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001976 ext3_msg(sb, KERN_ERR,
1977 "error: can't read group descriptor %d", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 db_count = i;
1979 goto failed_mount2;
1980 }
1981 }
1982 if (!ext3_check_descriptors (sb)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01001983 ext3_msg(sb, KERN_ERR,
1984 "error: group descriptors corrupted");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 goto failed_mount2;
1986 }
1987 sbi->s_gdb_count = db_count;
1988 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1989 spin_lock_init(&sbi->s_next_gen_lock);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001990
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 /* per fileystem reservation list head & lock */
1992 spin_lock_init(&sbi->s_rsv_window_lock);
1993 sbi->s_rsv_window_root = RB_ROOT;
1994 /* Add a single, static dummy reservation to the start of the
1995 * reservation window list --- it gives us a placeholder for
1996 * append-at-start-of-list which makes the allocation logic
1997 * _much_ simpler. */
1998 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1999 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
2000 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2001 sbi->s_rsv_window_head.rsv_goal_size = 0;
2002 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
2003
2004 /*
2005 * set up enough so that it can read an inode
2006 */
2007 sb->s_op = &ext3_sops;
2008 sb->s_export_op = &ext3_export_ops;
2009 sb->s_xattr = ext3_xattr_handlers;
2010#ifdef CONFIG_QUOTA
2011 sb->s_qcop = &ext3_qctl_operations;
2012 sb->dq_op = &ext3_quota_operations;
Jan Kara4018cfb2014-09-25 16:52:38 +02002013 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014#endif
Aneesh Kumar K.V03cb5f02011-01-29 18:43:39 +05302015 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
Eric Sandeenb8a052d2009-12-14 13:00:30 -06002017 mutex_init(&sbi->s_orphan_lock);
Eric Sandeen96d2a492009-12-14 13:01:05 -06002018 mutex_init(&sbi->s_resize_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019
2020 sb->s_root = NULL;
2021
2022 needs_recovery = (es->s_last_orphan != 0 ||
2023 EXT3_HAS_INCOMPAT_FEATURE(sb,
2024 EXT3_FEATURE_INCOMPAT_RECOVER));
2025
2026 /*
2027 * The first inode we look at is the journal inode. Don't try
2028 * root first: it may be modified in the journal!
2029 */
2030 if (!test_opt(sb, NOLOAD) &&
2031 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
Johann Lombardi71b96252006-01-08 01:03:20 -08002032 if (ext3_load_journal(sb, es, journal_devnum))
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002033 goto failed_mount2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 } else if (journal_inum) {
2035 if (ext3_create_journal(sb, es, journal_inum))
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002036 goto failed_mount2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 } else {
2038 if (!silent)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002039 ext3_msg(sb, KERN_ERR,
2040 "error: no journal found. "
2041 "mounting ext3 over ext2?");
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002042 goto failed_mount2;
2043 }
2044 err = percpu_counter_init(&sbi->s_freeblocks_counter,
Tejun Heo908c7f12014-09-08 09:51:29 +09002045 ext3_count_free_blocks(sb), GFP_KERNEL);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002046 if (!err) {
2047 err = percpu_counter_init(&sbi->s_freeinodes_counter,
Tejun Heo908c7f12014-09-08 09:51:29 +09002048 ext3_count_free_inodes(sb), GFP_KERNEL);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002049 }
2050 if (!err) {
2051 err = percpu_counter_init(&sbi->s_dirs_counter,
Tejun Heo908c7f12014-09-08 09:51:29 +09002052 ext3_count_dirs(sb), GFP_KERNEL);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002053 }
2054 if (err) {
2055 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
Namhyung Kim4569cd12010-10-11 19:08:06 +09002056 ret = err;
Mingming Cao0216bfc2006-06-23 02:05:41 -07002057 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 }
2059
2060 /* We have now updated the journal if required, so we can
2061 * validate the data journaling mode. */
2062 switch (test_opt(sb, DATA_FLAGS)) {
2063 case 0:
2064 /* No mode set, assume a default based on the journal
2065 capabilities: ORDERED_DATA if the journal can
2066 cope, else JOURNAL_DATA */
2067 if (journal_check_available_features
2068 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
Linus Torvaldsbbae8bc2009-04-06 17:16:47 -07002069 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 else
2071 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2072 break;
2073
2074 case EXT3_MOUNT_ORDERED_DATA:
2075 case EXT3_MOUNT_WRITEBACK_DATA:
2076 if (!journal_check_available_features
2077 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002078 ext3_msg(sb, KERN_ERR,
2079 "error: journal does not support "
2080 "requested data journaling mode");
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002081 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 }
2083 default:
2084 break;
2085 }
2086
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087 /*
2088 * The journal_load will have done any necessary log recovery,
2089 * so we can safely mount the rest of the filesystem now.
2090 */
2091
David Howells473043d2008-02-07 00:15:36 -08002092 root = ext3_iget(sb, EXT3_ROOT_INO);
2093 if (IS_ERR(root)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002094 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
David Howells473043d2008-02-07 00:15:36 -08002095 ret = PTR_ERR(root);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002096 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 }
2098 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
David Howells473043d2008-02-07 00:15:36 -08002099 iput(root);
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002100 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002101 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 }
Al Viro48fde702012-01-08 22:15:13 -05002103 sb->s_root = d_make_root(root);
David Howells473043d2008-02-07 00:15:36 -08002104 if (!sb->s_root) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002105 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
David Howells473043d2008-02-07 00:15:36 -08002106 ret = -ENOMEM;
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002107 goto failed_mount3;
David Howells473043d2008-02-07 00:15:36 -08002108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109
Eric Sandeenf007dbf2012-05-24 12:00:37 -05002110 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2111 sb->s_flags |= MS_RDONLY;
Eric Sandeened505ee2009-12-14 12:59:18 -06002112
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2114 ext3_orphan_cleanup(sb, es);
2115 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
Eryu Guan63894ab2011-11-01 10:06:19 +08002116 if (needs_recovery) {
2117 ext3_mark_recovery_complete(sb, es);
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002118 ext3_msg(sb, KERN_INFO, "recovery complete");
Eryu Guan63894ab2011-11-01 10:06:19 +08002119 }
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002120 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2122 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2123 "writeback");
2124
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125 return 0;
2126
2127cantfind_ext3:
2128 if (!silent)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002129 ext3_msg(sb, KERN_INFO,
2130 "error: can't find ext3 filesystem on dev %s.",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 sb->s_id);
2132 goto failed_mount;
2133
Mingming Cao0216bfc2006-06-23 02:05:41 -07002134failed_mount3:
2135 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2136 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2137 percpu_counter_destroy(&sbi->s_dirs_counter);
Dmitry Monakhov41d1a632010-04-12 23:46:00 +04002138 journal_destroy(sbi->s_journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139failed_mount2:
2140 for (i = 0; i < db_count; i++)
2141 brelse(sbi->s_group_desc[i]);
2142 kfree(sbi->s_group_desc);
2143failed_mount:
2144#ifdef CONFIG_QUOTA
Jan Karaa93114e2014-09-10 20:48:02 +02002145 for (i = 0; i < EXT3_MAXQUOTAS; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146 kfree(sbi->s_qf_names[i]);
2147#endif
2148 ext3_blkdev_remove(sbi);
2149 brelse(bh);
2150out_fail:
2151 sb->s_fs_info = NULL;
Manish Katiyarde5ce032009-05-17 23:52:47 -04002152 kfree(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 kfree(sbi);
David Howells473043d2008-02-07 00:15:36 -08002154 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155}
2156
2157/*
2158 * Setup any per-fs journal parameters now. We'll do this both on
2159 * initial mount, once the journal has been initialised but before we've
Mingming Caoae6ddcc2006-09-27 01:49:27 -07002160 * done any recovery; and again on any subsequent remount.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 */
2162static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2163{
2164 struct ext3_sb_info *sbi = EXT3_SB(sb);
2165
2166 if (sbi->s_commit_interval)
2167 journal->j_commit_interval = sbi->s_commit_interval;
2168 /* We could also set up an ext3-specific default for the commit
2169 * interval here, but for now we'll just fall back to the jbd
2170 * default. */
2171
2172 spin_lock(&journal->j_state_lock);
2173 if (test_opt(sb, BARRIER))
2174 journal->j_flags |= JFS_BARRIER;
2175 else
2176 journal->j_flags &= ~JFS_BARRIER;
Hidehiro Kawai0e4fb5e2008-10-18 20:27:57 -07002177 if (test_opt(sb, DATA_ERR_ABORT))
2178 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2179 else
2180 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 spin_unlock(&journal->j_state_lock);
2182}
2183
Eric Sandeeneee194e2006-09-27 01:49:30 -07002184static journal_t *ext3_get_journal(struct super_block *sb,
2185 unsigned int journal_inum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186{
2187 struct inode *journal_inode;
2188 journal_t *journal;
2189
2190 /* First, test for the existence of a valid inode on disk. Bad
2191 * things happen if we iget() an unused inode, as the subsequent
2192 * iput() will try to delete it. */
2193
David Howells473043d2008-02-07 00:15:36 -08002194 journal_inode = ext3_iget(sb, journal_inum);
2195 if (IS_ERR(journal_inode)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002196 ext3_msg(sb, KERN_ERR, "error: no journal found");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197 return NULL;
2198 }
2199 if (!journal_inode->i_nlink) {
2200 make_bad_inode(journal_inode);
2201 iput(journal_inode);
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002202 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 return NULL;
2204 }
2205
2206 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2207 journal_inode, journal_inode->i_size);
David Howells473043d2008-02-07 00:15:36 -08002208 if (!S_ISREG(journal_inode->i_mode)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002209 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210 iput(journal_inode);
2211 return NULL;
2212 }
2213
2214 journal = journal_init_inode(journal_inode);
2215 if (!journal) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002216 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 iput(journal_inode);
2218 return NULL;
2219 }
2220 journal->j_private = sb;
2221 ext3_init_journal_params(sb, journal);
2222 return journal;
2223}
2224
2225static journal_t *ext3_get_dev_journal(struct super_block *sb,
2226 dev_t j_dev)
2227{
2228 struct buffer_head * bh;
2229 journal_t *journal;
Mingming Cao43d23f92006-06-25 05:48:07 -07002230 ext3_fsblk_t start;
Mingming Cao1c2bf372006-06-25 05:48:06 -07002231 ext3_fsblk_t len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232 int hblock, blocksize;
Mingming Cao43d23f92006-06-25 05:48:07 -07002233 ext3_fsblk_t sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234 unsigned long offset;
2235 struct ext3_super_block * es;
2236 struct block_device *bdev;
2237
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002238 bdev = ext3_blkdev_get(j_dev, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 if (bdev == NULL)
2240 return NULL;
2241
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 blocksize = sb->s_blocksize;
Martin K. Petersene1defc42009-05-22 17:17:49 -04002243 hblock = bdev_logical_block_size(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244 if (blocksize < hblock) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002245 ext3_msg(sb, KERN_ERR,
2246 "error: blocksize too small for journal device");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247 goto out_bdev;
2248 }
2249
2250 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2251 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2252 set_blocksize(bdev, blocksize);
2253 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002254 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2255 "external journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 goto out_bdev;
2257 }
2258
Namhyung Kim57e94d82010-10-11 02:10:45 +09002259 es = (struct ext3_super_block *) (bh->b_data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2261 !(le32_to_cpu(es->s_feature_incompat) &
2262 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002263 ext3_msg(sb, KERN_ERR, "error: external journal has "
2264 "bad superblock");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 brelse(bh);
2266 goto out_bdev;
2267 }
2268
2269 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002270 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 brelse(bh);
2272 goto out_bdev;
2273 }
2274
2275 len = le32_to_cpu(es->s_blocks_count);
2276 start = sb_block + 1;
2277 brelse(bh); /* we're done with the superblock */
2278
2279 journal = journal_init_dev(bdev, sb->s_bdev,
2280 start, len, blocksize);
2281 if (!journal) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002282 ext3_msg(sb, KERN_ERR,
2283 "error: failed to create device journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284 goto out_bdev;
2285 }
2286 journal->j_private = sb;
Zheng Liud03e1292011-12-05 15:55:11 +08002287 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2288 if (bh_submit_read(journal->j_sb_buffer)) {
2289 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2290 goto out_journal;
2291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292 }
2293 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002294 ext3_msg(sb, KERN_ERR,
2295 "error: external journal has more than one "
2296 "user (unsupported) - %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 be32_to_cpu(journal->j_superblock->s_nr_users));
2298 goto out_journal;
2299 }
2300 EXT3_SB(sb)->journal_bdev = bdev;
2301 ext3_init_journal_params(sb, journal);
2302 return journal;
2303out_journal:
2304 journal_destroy(journal);
2305out_bdev:
2306 ext3_blkdev_put(bdev);
2307 return NULL;
2308}
2309
Johann Lombardi71b96252006-01-08 01:03:20 -08002310static int ext3_load_journal(struct super_block *sb,
2311 struct ext3_super_block *es,
2312 unsigned long journal_devnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313{
2314 journal_t *journal;
Eric Sandeeneee194e2006-09-27 01:49:30 -07002315 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
Johann Lombardi71b96252006-01-08 01:03:20 -08002316 dev_t journal_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317 int err = 0;
2318 int really_read_only;
2319
Johann Lombardi71b96252006-01-08 01:03:20 -08002320 if (journal_devnum &&
2321 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002322 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2323 "numbers have changed");
Johann Lombardi71b96252006-01-08 01:03:20 -08002324 journal_dev = new_decode_dev(journal_devnum);
2325 } else
2326 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2327
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 really_read_only = bdev_read_only(sb->s_bdev);
2329
2330 /*
2331 * Are we loading a blank journal or performing recovery after a
2332 * crash? For recovery, we need to check in advance whether we
2333 * can get read-write access to the device.
2334 */
2335
2336 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2337 if (sb->s_flags & MS_RDONLY) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002338 ext3_msg(sb, KERN_INFO,
2339 "recovery required on readonly filesystem");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 if (really_read_only) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002341 ext3_msg(sb, KERN_ERR, "error: write access "
2342 "unavailable, cannot proceed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 return -EROFS;
2344 }
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002345 ext3_msg(sb, KERN_INFO,
2346 "write access will be enabled during recovery");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347 }
2348 }
2349
2350 if (journal_inum && journal_dev) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002351 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2352 "and inode journals");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 return -EINVAL;
2354 }
2355
2356 if (journal_inum) {
2357 if (!(journal = ext3_get_journal(sb, journal_inum)))
2358 return -EINVAL;
2359 } else {
2360 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2361 return -EINVAL;
2362 }
2363
Eric Sandeen0636c732010-04-30 11:09:34 -05002364 if (!(journal->j_flags & JFS_BARRIER))
2365 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2366
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2368 err = journal_update_format(journal);
2369 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002370 ext3_msg(sb, KERN_ERR, "error updating journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 journal_destroy(journal);
2372 return err;
2373 }
2374 }
2375
2376 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2377 err = journal_wipe(journal, !really_read_only);
2378 if (!err)
2379 err = journal_load(journal);
2380
2381 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002382 ext3_msg(sb, KERN_ERR, "error loading journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383 journal_destroy(journal);
2384 return err;
2385 }
2386
2387 EXT3_SB(sb)->s_journal = journal;
2388 ext3_clear_journal_err(sb, es);
Johann Lombardi71b96252006-01-08 01:03:20 -08002389
Maciej Żenczykowski31d710a2010-09-26 12:38:28 +00002390 if (!really_read_only && journal_devnum &&
Johann Lombardi71b96252006-01-08 01:03:20 -08002391 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2392 es->s_journal_dev = cpu_to_le32(journal_devnum);
Johann Lombardi71b96252006-01-08 01:03:20 -08002393
2394 /* Make sure we flush the recovery flag to disk. */
2395 ext3_commit_super(sb, es, 1);
2396 }
2397
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398 return 0;
2399}
2400
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002401static int ext3_create_journal(struct super_block *sb,
2402 struct ext3_super_block *es,
Eric Sandeeneee194e2006-09-27 01:49:30 -07002403 unsigned int journal_inum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404{
2405 journal_t *journal;
Borislav Petkov952d9de2007-07-15 23:41:45 -07002406 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407
2408 if (sb->s_flags & MS_RDONLY) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002409 ext3_msg(sb, KERN_ERR,
2410 "error: readonly filesystem when trying to "
2411 "create journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002412 return -EROFS;
2413 }
2414
Borislav Petkov952d9de2007-07-15 23:41:45 -07002415 journal = ext3_get_journal(sb, journal_inum);
2416 if (!journal)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417 return -EINVAL;
2418
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002419 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 journal_inum);
2421
Borislav Petkov952d9de2007-07-15 23:41:45 -07002422 err = journal_create(journal);
2423 if (err) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002424 ext3_msg(sb, KERN_ERR, "error creating journal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002425 journal_destroy(journal);
2426 return -EIO;
2427 }
2428
2429 EXT3_SB(sb)->s_journal = journal;
2430
2431 ext3_update_dynamic_rev(sb);
2432 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2433 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2434
2435 es->s_journal_inum = cpu_to_le32(journal_inum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436
2437 /* Make sure we flush the recovery flag to disk. */
2438 ext3_commit_super(sb, es, 1);
2439
2440 return 0;
2441}
2442
Takashi Satoc4be0c12009-01-09 16:40:58 -08002443static int ext3_commit_super(struct super_block *sb,
2444 struct ext3_super_block *es,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 int sync)
2446{
2447 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
Takashi Satoc4be0c12009-01-09 16:40:58 -08002448 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449
2450 if (!sbh)
Takashi Satoc4be0c12009-01-09 16:40:58 -08002451 return error;
Darrick J. Wongdff68252010-10-04 12:35:05 -07002452
2453 if (buffer_write_io_error(sbh)) {
2454 /*
2455 * Oh, dear. A previous attempt to write the
2456 * superblock failed. This could happen because the
2457 * USB device was yanked out. Or it could happen to
2458 * be a transient write error and maybe the block will
2459 * be remapped. Nothing we can do but to retry the
2460 * write and hope for the best.
2461 */
2462 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2463 "superblock detected");
2464 clear_buffer_write_io_error(sbh);
2465 set_buffer_uptodate(sbh);
2466 }
Theodore Ts'o96ec2e02009-09-16 11:21:13 -04002467 /*
2468 * If the file system is mounted read-only, don't update the
2469 * superblock write time. This avoids updating the superblock
2470 * write time when we are mounting the root file system
2471 * read/only but we need to replay the journal; at that point,
2472 * for people who are east of GMT and who make their clock
2473 * tick in localtime for Windows bug-for-bug compatibility,
2474 * the clock is set in the future, and this will cause e2fsck
2475 * to complain and force a full file system check.
2476 */
2477 if (!(sb->s_flags & MS_RDONLY))
2478 es->s_wtime = cpu_to_le32(get_seconds());
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2480 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2481 BUFFER_TRACE(sbh, "marking dirty");
2482 mark_buffer_dirty(sbh);
Darrick J. Wongdff68252010-10-04 12:35:05 -07002483 if (sync) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08002484 error = sync_dirty_buffer(sbh);
Darrick J. Wongdff68252010-10-04 12:35:05 -07002485 if (buffer_write_io_error(sbh)) {
2486 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2487 "superblock");
2488 clear_buffer_write_io_error(sbh);
2489 set_buffer_uptodate(sbh);
2490 }
2491 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002492 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493}
2494
2495
2496/*
2497 * Have we just finished recovery? If so, and if we are mounting (or
2498 * remounting) the filesystem readonly, then we will end up with a
2499 * consistent fs on disk. Record that fact.
2500 */
2501static void ext3_mark_recovery_complete(struct super_block * sb,
2502 struct ext3_super_block * es)
2503{
2504 journal_t *journal = EXT3_SB(sb)->s_journal;
2505
2506 journal_lock_updates(journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002507 if (journal_flush(journal) < 0)
2508 goto out;
2509
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2511 sb->s_flags & MS_RDONLY) {
2512 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513 ext3_commit_super(sb, es, 1);
2514 }
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002515
2516out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517 journal_unlock_updates(journal);
2518}
2519
2520/*
2521 * If we are mounting (or read-write remounting) a filesystem whose journal
2522 * has recorded an error from a previous lifetime, move that error to the
2523 * main filesystem now.
2524 */
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002525static void ext3_clear_journal_err(struct super_block *sb,
2526 struct ext3_super_block *es)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527{
2528 journal_t *journal;
2529 int j_errno;
2530 const char *errstr;
2531
2532 journal = EXT3_SB(sb)->s_journal;
2533
2534 /*
2535 * Now check for any error status which may have been recorded in the
2536 * journal by a prior ext3_error() or ext3_abort()
2537 */
2538
2539 j_errno = journal_errno(journal);
2540 if (j_errno) {
2541 char nbuf[16];
2542
2543 errstr = ext3_decode_error(sb, j_errno, nbuf);
Harvey Harrisone05b6b52008-04-28 02:16:15 -07002544 ext3_warning(sb, __func__, "Filesystem error recorded "
Linus Torvalds1da177e2005-04-16 15:20:36 -07002545 "from previous mount: %s", errstr);
Harvey Harrisone05b6b52008-04-28 02:16:15 -07002546 ext3_warning(sb, __func__, "Marking fs in need of "
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547 "filesystem check.");
2548
2549 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2550 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2551 ext3_commit_super (sb, es, 1);
2552
2553 journal_clear_err(journal);
2554 }
2555}
2556
2557/*
2558 * Force the running and committing transactions to commit,
2559 * and wait on the commit.
2560 */
2561int ext3_force_commit(struct super_block *sb)
2562{
2563 journal_t *journal;
2564 int ret;
2565
2566 if (sb->s_flags & MS_RDONLY)
2567 return 0;
2568
2569 journal = EXT3_SB(sb)->s_journal;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570 ret = ext3_journal_force_commit(journal);
2571 return ret;
2572}
2573
Linus Torvalds1da177e2005-04-16 15:20:36 -07002574static int ext3_sync_fs(struct super_block *sb, int wait)
2575{
Jan Kara02ac5972009-02-11 13:04:26 -08002576 tid_t target;
Arthur Jonesc87591b2008-11-06 12:53:35 -08002577
Lukas Czerner785c4bc2011-05-23 18:33:01 +02002578 trace_ext3_sync_fs(sb, wait);
Jan Karaa1177822012-07-03 16:45:29 +02002579 /*
2580 * Writeback quota in non-journalled quota case - journalled quota has
2581 * no dirty dquots
2582 */
2583 dquot_writeback_dquots(sb, -1);
Jan Kara02ac5972009-02-11 13:04:26 -08002584 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2585 if (wait)
2586 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2587 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 return 0;
2589}
2590
2591/*
2592 * LVM calls this function before a (read-only) snapshot is created. This
2593 * gives us a chance to flush the journal completely and mark the fs clean.
2594 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08002595static int ext3_freeze(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596{
Takashi Satoc4be0c12009-01-09 16:40:58 -08002597 int error = 0;
2598 journal_t *journal;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599
2600 if (!(sb->s_flags & MS_RDONLY)) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08002601 journal = EXT3_SB(sb)->s_journal;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002602
2603 /* Now we set up the journal barrier. */
2604 journal_lock_updates(journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07002605
2606 /*
2607 * We don't want to clear needs_recovery flag when we failed
2608 * to flush the journal.
2609 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08002610 error = journal_flush(journal);
2611 if (error < 0)
2612 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002613
2614 /* Journal blocked and flushed, clear needs_recovery flag. */
2615 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
Takashi Satoc4be0c12009-01-09 16:40:58 -08002616 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2617 if (error)
2618 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002619 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002620 return 0;
2621
2622out:
2623 journal_unlock_updates(journal);
2624 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625}
2626
2627/*
2628 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2629 * flag here, even though the filesystem is not technically dirty yet.
2630 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08002631static int ext3_unfreeze(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632{
2633 if (!(sb->s_flags & MS_RDONLY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634 /* Reser the needs_recovery flag before the fs is unlocked. */
2635 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2636 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2638 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002639 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640}
2641
2642static int ext3_remount (struct super_block * sb, int * flags, char * data)
2643{
2644 struct ext3_super_block * es;
2645 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07002646 ext3_fsblk_t n_blocks_count = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002647 unsigned long old_sb_flags;
2648 struct ext3_mount_options old_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002649 int enable_quota = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002650 int err;
2651#ifdef CONFIG_QUOTA
2652 int i;
2653#endif
2654
Theodore Ts'o02b99842014-03-13 10:14:33 -04002655 sync_filesystem(sb);
2656
Jan Kara08c6a962005-07-12 13:58:28 -07002657 /* Store the original options */
2658 old_sb_flags = sb->s_flags;
2659 old_opts.s_mount_opt = sbi->s_mount_opt;
2660 old_opts.s_resuid = sbi->s_resuid;
2661 old_opts.s_resgid = sbi->s_resgid;
2662 old_opts.s_commit_interval = sbi->s_commit_interval;
2663#ifdef CONFIG_QUOTA
2664 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
Jan Karaa93114e2014-09-10 20:48:02 +02002665 for (i = 0; i < EXT3_MAXQUOTAS; i++)
Jan Karaf56426a2012-12-31 12:38:36 +01002666 if (sbi->s_qf_names[i]) {
2667 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2668 GFP_KERNEL);
2669 if (!old_opts.s_qf_names[i]) {
2670 int j;
2671
2672 for (j = 0; j < i; j++)
2673 kfree(old_opts.s_qf_names[j]);
2674 return -ENOMEM;
2675 }
2676 } else
2677 old_opts.s_qf_names[i] = NULL;
Jan Kara08c6a962005-07-12 13:58:28 -07002678#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679
2680 /*
2681 * Allow the "check" option to be passed as a remount option.
2682 */
Johann Lombardi71b96252006-01-08 01:03:20 -08002683 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002684 err = -EINVAL;
2685 goto restore_opts;
2686 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687
Dmitry Monakhove3c96432010-02-02 16:05:51 +03002688 if (test_opt(sb, ABORT))
Harvey Harrisone05b6b52008-04-28 02:16:15 -07002689 ext3_abort(sb, __func__, "Abort forced by user");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690
2691 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhove3c96432010-02-02 16:05:51 +03002692 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693
2694 es = sbi->s_es;
2695
2696 ext3_init_journal_params(sb, sbi->s_journal);
2697
2698 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2699 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
Dmitry Monakhove3c96432010-02-02 16:05:51 +03002700 if (test_opt(sb, ABORT)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002701 err = -EROFS;
2702 goto restore_opts;
2703 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704
2705 if (*flags & MS_RDONLY) {
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002706 err = dquot_suspend(sb, -1);
2707 if (err < 0)
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002708 goto restore_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002709
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 /*
2711 * First of all, the unconditional stuff we have to do
2712 * to disable replay of the journal when we next remount
2713 */
2714 sb->s_flags |= MS_RDONLY;
2715
2716 /*
2717 * OK, test if we are remounting a valid rw partition
2718 * readonly, and if so set the rdonly flag and then
2719 * mark the partition as valid again.
2720 */
2721 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2722 (sbi->s_mount_state & EXT3_VALID_FS))
2723 es->s_state = cpu_to_le16(sbi->s_mount_state);
2724
2725 ext3_mark_recovery_complete(sb, es);
2726 } else {
2727 __le32 ret;
2728 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2729 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002730 ext3_msg(sb, KERN_WARNING,
2731 "warning: couldn't remount RDWR "
2732 "because of unsupported optional "
2733 "features (%x)", le32_to_cpu(ret));
Jan Kara08c6a962005-07-12 13:58:28 -07002734 err = -EROFS;
2735 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 }
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002737
2738 /*
2739 * If we have an unprocessed orphan list hanging
2740 * around from a previously readonly bdev mount,
Toshiyuki Okajima1cde2012011-08-02 18:16:57 +09002741 * require a full umount & mount for now.
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002742 */
2743 if (es->s_last_orphan) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002744 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002745 "remount RDWR because of unprocessed "
2746 "orphan inode list. Please "
Toshiyuki Okajima1cde2012011-08-02 18:16:57 +09002747 "umount & mount instead.");
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002748 err = -EINVAL;
2749 goto restore_opts;
2750 }
2751
Linus Torvalds1da177e2005-04-16 15:20:36 -07002752 /*
2753 * Mounting a RDONLY partition read-write, so reread
2754 * and store the current valid flag. (It may have
2755 * been changed by e2fsck since we originally mounted
2756 * the partition.)
2757 */
2758 ext3_clear_journal_err(sb, es);
2759 sbi->s_mount_state = le16_to_cpu(es->s_state);
Dave Kleikampa4e4de32006-09-27 01:49:36 -07002760 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
Jan Kara08c6a962005-07-12 13:58:28 -07002761 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762 if (!ext3_setup_super (sb, es, 0))
2763 sb->s_flags &= ~MS_RDONLY;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002764 enable_quota = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002765 }
2766 }
Jan Kara08c6a962005-07-12 13:58:28 -07002767#ifdef CONFIG_QUOTA
2768 /* Release old quota file names */
Jan Karaa93114e2014-09-10 20:48:02 +02002769 for (i = 0; i < EXT3_MAXQUOTAS; i++)
Jan Karaf56426a2012-12-31 12:38:36 +01002770 kfree(old_opts.s_qf_names[i]);
Jan Kara08c6a962005-07-12 13:58:28 -07002771#endif
Christoph Hellwigc79d9672010-05-19 07:16:40 -04002772 if (enable_quota)
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002773 dquot_resume(sb, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 return 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002775restore_opts:
2776 sb->s_flags = old_sb_flags;
2777 sbi->s_mount_opt = old_opts.s_mount_opt;
2778 sbi->s_resuid = old_opts.s_resuid;
2779 sbi->s_resgid = old_opts.s_resgid;
2780 sbi->s_commit_interval = old_opts.s_commit_interval;
2781#ifdef CONFIG_QUOTA
2782 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
Jan Karaa93114e2014-09-10 20:48:02 +02002783 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
Jan Karaf56426a2012-12-31 12:38:36 +01002784 kfree(sbi->s_qf_names[i]);
Jan Kara08c6a962005-07-12 13:58:28 -07002785 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2786 }
2787#endif
2788 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002789}
2790
David Howells726c3342006-06-23 02:02:58 -07002791static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002792{
David Howells726c3342006-06-23 02:02:58 -07002793 struct super_block *sb = dentry->d_sb;
Alex Tomas09fe3162006-03-24 03:16:16 -08002794 struct ext3_sb_info *sbi = EXT3_SB(sb);
2795 struct ext3_super_block *es = sbi->s_es;
Pekka Enberg50ee0a32006-12-06 20:35:28 -08002796 u64 fsid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002798 if (test_opt(sb, MINIX_DF)) {
2799 sbi->s_overhead_last = 0;
2800 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2801 unsigned long ngroups = sbi->s_groups_count, i;
2802 ext3_fsblk_t overhead = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803 smp_rmb();
2804
2805 /*
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002806 * Compute the overhead (FS structures). This is constant
2807 * for a given filesystem unless the number of block groups
2808 * changes so we cache the previous value until it does.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809 */
2810
2811 /*
2812 * All of the blocks before first_data_block are
2813 * overhead
2814 */
2815 overhead = le32_to_cpu(es->s_first_data_block);
2816
2817 /*
2818 * Add the overhead attributed to the superblock and
2819 * block group descriptors. If the sparse superblocks
2820 * feature is turned on, then not all groups have this.
2821 */
2822 for (i = 0; i < ngroups; i++) {
2823 overhead += ext3_bg_has_super(sb, i) +
2824 ext3_bg_num_gdb(sb, i);
2825 cond_resched();
2826 }
2827
2828 /*
2829 * Every block group has an inode bitmap, a block
2830 * bitmap, and an inode table.
2831 */
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002832 overhead += ngroups * (2 + sbi->s_itb_per_group);
Eric Sandeen2046fd12013-10-15 18:45:17 -05002833
Chin-Tsung Chenge6d8fb32014-08-15 15:49:31 +08002834 /* Add the internal journal blocks as well */
2835 if (sbi->s_journal && !sbi->journal_bdev)
2836 overhead += sbi->s_journal->j_maxlen;
Eric Sandeen2046fd12013-10-15 18:45:17 -05002837
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002838 sbi->s_overhead_last = overhead;
2839 smp_wmb();
2840 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841 }
2842
2843 buf->f_type = EXT3_SUPER_MAGIC;
2844 buf->f_bsize = sb->s_blocksize;
Badari Pulavartya71ce8c2007-07-15 23:41:59 -07002845 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002846 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2848 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2849 buf->f_bavail = 0;
2850 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002851 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 buf->f_namelen = EXT3_NAME_LEN;
Pekka Enberg50ee0a32006-12-06 20:35:28 -08002853 fsid = le64_to_cpup((void *)es->s_uuid) ^
2854 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2855 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2856 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002857 return 0;
2858}
2859
2860/* Helper function for writing quotas on sync - we need to start transaction before quota file
2861 * is locked for write. Otherwise the are possible deadlocks:
2862 * Process 1 Process 2
2863 * ext3_create() quota_sync()
2864 * journal_start() write_dquot()
Christoph Hellwig871a2932010-03-03 09:05:07 -05002865 * dquot_initialize() down(dqio_mutex)
Ingo Molnard3be9152006-03-23 03:00:29 -08002866 * down(dqio_mutex) journal_start()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867 *
2868 */
2869
2870#ifdef CONFIG_QUOTA
2871
2872static inline struct inode *dquot_to_inode(struct dquot *dquot)
2873{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07002874 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875}
2876
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877static int ext3_write_dquot(struct dquot *dquot)
2878{
2879 int ret, err;
2880 handle_t *handle;
2881 struct inode *inode;
2882
2883 inode = dquot_to_inode(dquot);
2884 handle = ext3_journal_start(inode,
Jan Kara1f545872005-06-23 22:01:04 -07002885 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 if (IS_ERR(handle))
2887 return PTR_ERR(handle);
2888 ret = dquot_commit(dquot);
2889 err = ext3_journal_stop(handle);
2890 if (!ret)
2891 ret = err;
2892 return ret;
2893}
2894
2895static int ext3_acquire_dquot(struct dquot *dquot)
2896{
2897 int ret, err;
2898 handle_t *handle;
2899
2900 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002901 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902 if (IS_ERR(handle))
2903 return PTR_ERR(handle);
2904 ret = dquot_acquire(dquot);
2905 err = ext3_journal_stop(handle);
2906 if (!ret)
2907 ret = err;
2908 return ret;
2909}
2910
2911static int ext3_release_dquot(struct dquot *dquot)
2912{
2913 int ret, err;
2914 handle_t *handle;
2915
2916 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002917 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07002918 if (IS_ERR(handle)) {
2919 /* Release dquot anyway to avoid endless cycle in dqput() */
2920 dquot_release(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07002922 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 ret = dquot_release(dquot);
2924 err = ext3_journal_stop(handle);
2925 if (!ret)
2926 ret = err;
2927 return ret;
2928}
2929
2930static int ext3_mark_dquot_dirty(struct dquot *dquot)
2931{
Jan Kara99aeaf62008-07-25 01:46:17 -07002932 /* Are we journaling quotas? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002933 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2934 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2935 dquot_mark_dquot_dirty(dquot);
2936 return ext3_write_dquot(dquot);
2937 } else {
2938 return dquot_mark_dquot_dirty(dquot);
2939 }
2940}
2941
2942static int ext3_write_info(struct super_block *sb, int type)
2943{
2944 int ret, err;
2945 handle_t *handle;
2946
2947 /* Data block + inode block */
2948 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2949 if (IS_ERR(handle))
2950 return PTR_ERR(handle);
2951 ret = dquot_commit_info(sb, type);
2952 err = ext3_journal_stop(handle);
2953 if (!ret)
2954 ret = err;
2955 return ret;
2956}
2957
2958/*
2959 * Turn on quotas during mount time - we need to find
2960 * the quota file and such...
2961 */
2962static int ext3_quota_on_mount(struct super_block *sb, int type)
2963{
Christoph Hellwig287a8092010-05-19 07:16:45 -04002964 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2965 EXT3_SB(sb)->s_jquota_fmt, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966}
2967
2968/*
2969 * Standard function to be called on quota_on
2970 */
2971static int ext3_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +02002972 struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973{
2974 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002975
Jan Kara1f545872005-06-23 22:01:04 -07002976 if (!test_opt(sb, QUOTA))
2977 return -EINVAL;
Jan Kara9cfe7b92008-07-25 01:46:16 -07002978
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979 /* Quotafile not on the same filesystem? */
Al Virod8c95842011-12-07 18:16:57 -05002980 if (path->dentry->d_sb != sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981 return -EXDEV;
Jan Kara9cfe7b92008-07-25 01:46:16 -07002982 /* Journaling quota? */
2983 if (EXT3_SB(sb)->s_qf_names[type]) {
2984 /* Quotafile not of fs root? */
Jan Karaf00c9e42010-09-15 17:38:58 +02002985 if (path->dentry->d_parent != sb->s_root)
Alexey Fisher4cf46b62009-11-22 20:38:55 +01002986 ext3_msg(sb, KERN_WARNING,
2987 "warning: Quota file not on filesystem root. "
2988 "Journaled quota will not work.");
Jan Kara9cfe7b92008-07-25 01:46:16 -07002989 }
2990
2991 /*
2992 * When we journal data on quota file, we have to flush journal to see
2993 * all updates to the file when we bypass pagecache...
2994 */
Jan Karaf00c9e42010-09-15 17:38:58 +02002995 if (ext3_should_journal_data(path->dentry->d_inode)) {
Jan Kara9cfe7b92008-07-25 01:46:16 -07002996 /*
2997 * We don't need to lock updates but journal_flush() could
2998 * otherwise be livelocked...
2999 */
3000 journal_lock_updates(EXT3_SB(sb)->s_journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07003001 err = journal_flush(EXT3_SB(sb)->s_journal);
Jan Kara9cfe7b92008-07-25 01:46:16 -07003002 journal_unlock_updates(EXT3_SB(sb)->s_journal);
Jan Karaf00c9e42010-09-15 17:38:58 +02003003 if (err)
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -07003004 return err;
Jan Kara9cfe7b92008-07-25 01:46:16 -07003005 }
3006
Jan Karaf00c9e42010-09-15 17:38:58 +02003007 return dquot_quota_on(sb, type, format_id, path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003008}
3009
3010/* Read data from quotafile - avoid pagecache and such because we cannot afford
3011 * acquiring the locks... As quota files are never truncated and quota code
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003012 * itself serializes the operations (and no one else should touch the files)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003013 * we don't have to be afraid of races */
3014static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
3015 size_t len, loff_t off)
3016{
3017 struct inode *inode = sb_dqopt(sb)->files[type];
3018 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3019 int err = 0;
3020 int offset = off & (sb->s_blocksize - 1);
3021 int tocopy;
3022 size_t toread;
3023 struct buffer_head *bh;
3024 loff_t i_size = i_size_read(inode);
3025
3026 if (off > i_size)
3027 return 0;
3028 if (off+len > i_size)
3029 len = i_size-off;
3030 toread = len;
3031 while (toread > 0) {
3032 tocopy = sb->s_blocksize - offset < toread ?
3033 sb->s_blocksize - offset : toread;
3034 bh = ext3_bread(NULL, inode, blk, 0, &err);
3035 if (err)
3036 return err;
3037 if (!bh) /* A hole? */
3038 memset(data, 0, tocopy);
3039 else
3040 memcpy(data, bh->b_data+offset, tocopy);
3041 brelse(bh);
3042 offset = 0;
3043 toread -= tocopy;
3044 data += tocopy;
3045 blk++;
3046 }
3047 return len;
3048}
3049
3050/* Write to quotafile (we know the transaction is already started and has
3051 * enough credits) */
3052static ssize_t ext3_quota_write(struct super_block *sb, int type,
3053 const char *data, size_t len, loff_t off)
3054{
3055 struct inode *inode = sb_dqopt(sb)->files[type];
3056 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3057 int err = 0;
3058 int offset = off & (sb->s_blocksize - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003060 struct buffer_head *bh;
3061 handle_t *handle = journal_current_handle();
3062
Jan Kara9c3013e2007-09-11 15:23:29 -07003063 if (!handle) {
Alexey Fisher4cf46b62009-11-22 20:38:55 +01003064 ext3_msg(sb, KERN_WARNING,
3065 "warning: quota write (off=%llu, len=%llu)"
3066 " cancelled because transaction is not started.",
Jan Kara9c3013e2007-09-11 15:23:29 -07003067 (unsigned long long)off, (unsigned long long)len);
3068 return -EIO;
3069 }
Dmitry Monakhove5472142010-02-16 19:33:42 +03003070
3071 /*
3072 * Since we account only one data block in transaction credits,
3073 * then it is impossible to cross a block boundary.
3074 */
3075 if (sb->s_blocksize - offset < len) {
3076 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3077 " cancelled because not block aligned",
3078 (unsigned long long)off, (unsigned long long)len);
3079 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080 }
Dmitry Monakhove5472142010-02-16 19:33:42 +03003081 bh = ext3_bread(handle, inode, blk, 1, &err);
3082 if (!bh)
3083 goto out;
3084 if (journal_quota) {
3085 err = ext3_journal_get_write_access(handle, bh);
3086 if (err) {
3087 brelse(bh);
3088 goto out;
3089 }
3090 }
3091 lock_buffer(bh);
3092 memcpy(bh->b_data+offset, data, len);
3093 flush_dcache_page(bh->b_page);
3094 unlock_buffer(bh);
3095 if (journal_quota)
3096 err = ext3_journal_dirty_metadata(handle, bh);
3097 else {
3098 /* Always do at least ordered writes for quotas */
3099 err = ext3_journal_dirty_data(handle, bh);
3100 mark_buffer_dirty(bh);
3101 }
3102 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103out:
Jan Kara905c3932012-04-25 21:24:30 +02003104 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 return err;
Dmitry Monakhove5472142010-02-16 19:33:42 +03003106 if (inode->i_size < off + len) {
3107 i_size_write(inode, off + len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003108 EXT3_I(inode)->i_disksize = inode->i_size;
3109 }
3110 inode->i_version++;
3111 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3112 ext3_mark_inode_dirty(handle, inode);
Dmitry Monakhove5472142010-02-16 19:33:42 +03003113 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003114}
3115
3116#endif
3117
Al Viro152a0832010-07-25 00:46:55 +04003118static struct dentry *ext3_mount(struct file_system_type *fs_type,
3119 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003120{
Al Viro152a0832010-07-25 00:46:55 +04003121 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003122}
3123
3124static struct file_system_type ext3_fs_type = {
3125 .owner = THIS_MODULE,
3126 .name = "ext3",
Al Viro152a0832010-07-25 00:46:55 +04003127 .mount = ext3_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128 .kill_sb = kill_block_super,
3129 .fs_flags = FS_REQUIRES_DEV,
3130};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08003131MODULE_ALIAS_FS("ext3");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003132
3133static int __init init_ext3_fs(void)
3134{
3135 int err = init_ext3_xattr();
3136 if (err)
3137 return err;
3138 err = init_inodecache();
3139 if (err)
3140 goto out1;
3141 err = register_filesystem(&ext3_fs_type);
3142 if (err)
3143 goto out;
3144 return 0;
3145out:
3146 destroy_inodecache();
3147out1:
Dave Kleikampe9ad5622006-09-27 01:49:35 -07003148 exit_ext3_xattr();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003149 return err;
3150}
3151
3152static void __exit exit_ext3_fs(void)
3153{
3154 unregister_filesystem(&ext3_fs_type);
3155 destroy_inodecache();
3156 exit_ext3_xattr();
3157}
3158
3159MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3160MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3161MODULE_LICENSE("GPL");
3162module_init(init_ext3_fs)
3163module_exit(exit_ext3_fs)