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ocfs2: Fix use after free on remount read-only
[net-next-2.6.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
29#include <linux/smp_lock.h>
30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
9f6200bb 38#include <linux/proc_fs.h>
3197ebdb 39#include <linux/ctype.h>
1330593e 40#include <linux/log2.h>
717d50e4 41#include <linux/crc16.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
3dcf5451
CH		 44#include "ext4.h"
45#include "ext4_jbd2.h"
ac27a0ec
DK		 46#include "xattr.h"
47#include "acl.h"
3661d286 48#include "mballoc.h"
ac27a0ec 49
9bffad1e
TT		 50#define CREATE_TRACE_POINTS
51#include <trace/events/ext4.h>
52
9f6200bb 53struct proc_dir_entry *ext4_proc_root;
3197ebdb 54static struct kset *ext4_kset;
9f6200bb 55
617ba13b 56static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 57 unsigned long journal_devnum);
e2d67052 58static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 59static void ext4_mark_recovery_complete(struct super_block *sb,
60 struct ext4_super_block *es);
61static void ext4_clear_journal_err(struct super_block *sb,
62 struct ext4_super_block *es);
617ba13b 63static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 64static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 65 char nbuf[16]);
2b2d6d01
TT		 66static int ext4_remount(struct super_block *sb, int *flags, char *data);
67static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 68static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 69static void ext4_write_super(struct super_block *sb);
c4be0c1d 70static int ext4_freeze(struct super_block *sb);
ba69f9ab
JK		 71static int ext4_get_sb(struct file_system_type *fs_type, int flags,
72 const char *dev_name, void *data, struct vfsmount *mnt);
ac27a0ec 73
ba69f9ab
JK		 74#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
75static struct file_system_type ext3_fs_type = {
76 .owner = THIS_MODULE,
77 .name = "ext3",
78 .get_sb = ext4_get_sb,
79 .kill_sb = kill_block_super,
80 .fs_flags = FS_REQUIRES_DEV,
81};
82#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
83#else
84#define IS_EXT3_SB(sb) (0)
85#endif
bd81d8ee 86
8fadc143
AR		 87ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
88 struct ext4_group_desc *bg)
bd81d8ee 89{
3a14589c 90 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 91 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 92 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 93}
94
8fadc143
AR		 95ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
96 struct ext4_group_desc *bg)
bd81d8ee 97{
5272f837 98 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 99 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 100 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 101}
102
8fadc143
AR		 103ext4_fsblk_t ext4_inode_table(struct super_block *sb,
104 struct ext4_group_desc *bg)
bd81d8ee 105{
5272f837 106 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 107 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 108 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 109}
110
560671a0
AK		 111__u32 ext4_free_blks_count(struct super_block *sb,
112 struct ext4_group_desc *bg)
113{
114 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
115 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 116 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 117}
118
119__u32 ext4_free_inodes_count(struct super_block *sb,
120 struct ext4_group_desc *bg)
121{
122 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
123 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 124 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 125}
126
127__u32 ext4_used_dirs_count(struct super_block *sb,
128 struct ext4_group_desc *bg)
129{
130 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
131 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 132 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 133}
134
135__u32 ext4_itable_unused_count(struct super_block *sb,
136 struct ext4_group_desc *bg)
137{
138 return le16_to_cpu(bg->bg_itable_unused_lo) |
139 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 140 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 141}
142
8fadc143
AR		 143void ext4_block_bitmap_set(struct super_block *sb,
144 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 145{
3a14589c 146 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 147 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
148 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 149}
150
8fadc143
AR		 151void ext4_inode_bitmap_set(struct super_block *sb,
152 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 153{
5272f837 154 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 155 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
156 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 157}
158
8fadc143
AR		 159void ext4_inode_table_set(struct super_block *sb,
160 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 161{
5272f837 162 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 163 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
164 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 165}
166
560671a0
AK		 167void ext4_free_blks_set(struct super_block *sb,
168 struct ext4_group_desc *bg, __u32 count)
169{
170 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
171 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
172 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
173}
174
175void ext4_free_inodes_set(struct super_block *sb,
176 struct ext4_group_desc *bg, __u32 count)
177{
178 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
179 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
180 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
181}
182
183void ext4_used_dirs_set(struct super_block *sb,
184 struct ext4_group_desc *bg, __u32 count)
185{
186 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
187 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
188 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
189}
190
191void ext4_itable_unused_set(struct super_block *sb,
192 struct ext4_group_desc *bg, __u32 count)
193{
194 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
195 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
196 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
197}
198
d3d1faf6
CW		 199
200/* Just increment the non-pointer handle value */
201static handle_t *ext4_get_nojournal(void)
202{
203 handle_t *handle = current->journal_info;
204 unsigned long ref_cnt = (unsigned long)handle;
205
206 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
207
208 ref_cnt++;
209 handle = (handle_t *)ref_cnt;
210
211 current->journal_info = handle;
212 return handle;
213}
214
215
216/* Decrement the non-pointer handle value */
217static void ext4_put_nojournal(handle_t *handle)
218{
219 unsigned long ref_cnt = (unsigned long)handle;
220
221 BUG_ON(ref_cnt == 0);
222
223 ref_cnt--;
224 handle = (handle_t *)ref_cnt;
225
226 current->journal_info = handle;
227}
228
ac27a0ec 229/*
dab291af 230 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 231 *
232 * The only special thing we need to do here is to make sure that all
233 * journal_end calls result in the superblock being marked dirty, so
234 * that sync() will call the filesystem's write_super callback if
235 * appropriate.
236 */
617ba13b 237handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 238{
239 journal_t *journal;
240
241 if (sb->s_flags & MS_RDONLY)
242 return ERR_PTR(-EROFS);
243
244 /* Special case here: if the journal has aborted behind our
245 * backs (eg. EIO in the commit thread), then we still need to
246 * take the FS itself readonly cleanly. */
617ba13b 247 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 248 if (journal) {
249 if (is_journal_aborted(journal)) {
0b8e58a1 250 ext4_abort(sb, __func__, "Detected aborted journal");
0390131b
FM		 251 return ERR_PTR(-EROFS);
252 }
253 return jbd2_journal_start(journal, nblocks);
ac27a0ec 254 }
d3d1faf6 255 return ext4_get_nojournal();
ac27a0ec
DK		 256}
257
258/*
259 * The only special thing we need to do here is to make sure that all
dab291af 260 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 261 * that sync() will call the filesystem's write_super callback if
262 * appropriate.
263 */
617ba13b 264int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 265{
266 struct super_block *sb;
267 int err;
268 int rc;
269
0390131b 270 if (!ext4_handle_valid(handle)) {
d3d1faf6 271 ext4_put_nojournal(handle);
0390131b
FM		 272 return 0;
273 }
ac27a0ec
DK		 274 sb = handle->h_transaction->t_journal->j_private;
275 err = handle->h_err;
dab291af 276 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 277
278 if (!err)
279 err = rc;
280 if (err)
617ba13b 281 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 282 return err;
283}
284
617ba13b 285void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 286 struct buffer_head *bh, handle_t *handle, int err)
287{
288 char nbuf[16];
617ba13b 289 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 290
0390131b
FM		 291 BUG_ON(!ext4_handle_valid(handle));
292
ac27a0ec
DK		 293 if (bh)
294 BUFFER_TRACE(bh, "abort");
295
296 if (!handle->h_err)
297 handle->h_err = err;
298
299 if (is_handle_aborted(handle))
300 return;
301
302 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
303 caller, errstr, err_fn);
304
dab291af 305 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 306}
307
308/* Deal with the reporting of failure conditions on a filesystem such as
309 * inconsistencies detected or read IO failures.
310 *
311 * On ext2, we can store the error state of the filesystem in the
617ba13b 312 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 313 * write ordering constraints on the superblock which prevent us from
314 * writing it out straight away; and given that the journal is about to
315 * be aborted, we can't rely on the current, or future, transactions to
316 * write out the superblock safely.
317 *
dab291af 318 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 319 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 320 * that error until we've noted it down and cleared it.
321 */
322
617ba13b 323static void ext4_handle_error(struct super_block *sb)
ac27a0ec 324{
617ba13b 325 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 326
617ba13b
MC		 327 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
328 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 329
330 if (sb->s_flags & MS_RDONLY)
331 return;
332
2b2d6d01 333 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 334 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 335
4ab2f15b 336 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 337 if (journal)
dab291af 338 jbd2_journal_abort(journal, -EIO);
ac27a0ec 339 }
2b2d6d01 340 if (test_opt(sb, ERRORS_RO)) {
b31e1552 341 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 342 sb->s_flags |= MS_RDONLY;
343 }
e2d67052 344 ext4_commit_super(sb, 1);
ac27a0ec 345 if (test_opt(sb, ERRORS_PANIC))
617ba13b 346 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 347 sb->s_id);
348}
349
12062ddd 350void __ext4_error(struct super_block *sb, const char *function,
2b2d6d01 351 const char *fmt, ...)
ac27a0ec
DK		 352{
353 va_list args;
354
355 va_start(args, fmt);
2b2d6d01 356 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 357 vprintk(fmt, args);
358 printk("\n");
359 va_end(args);
360
617ba13b 361 ext4_handle_error(sb);
ac27a0ec
DK		 362}
363
273df556
FM		 364void ext4_error_inode(const char *function, struct inode *inode,
365 const char *fmt, ...)
366{
367 va_list args;
368
369 va_start(args, fmt);
370 printk(KERN_CRIT "EXT4-fs error (device %s): %s: inode #%lu: (comm %s) ",
371 inode->i_sb->s_id, function, inode->i_ino, current->comm);
372 vprintk(fmt, args);
373 printk("\n");
374 va_end(args);
375
376 ext4_handle_error(inode->i_sb);
377}
378
379void ext4_error_file(const char *function, struct file *file,
380 const char *fmt, ...)
381{
382 va_list args;
383 struct inode *inode = file->f_dentry->d_inode;
384 char pathname[80], *path;
385
386 va_start(args, fmt);
387 path = d_path(&(file->f_path), pathname, sizeof(pathname));
388 if (!path)
389 path = "(unknown)";
390 printk(KERN_CRIT
391 "EXT4-fs error (device %s): %s: inode #%lu (comm %s path %s): ",
392 inode->i_sb->s_id, function, inode->i_ino, current->comm, path);
393 vprintk(fmt, args);
394 printk("\n");
395 va_end(args);
396
397 ext4_handle_error(inode->i_sb);
398}
399
2b2d6d01 400static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 401 char nbuf[16])
402{
403 char *errstr = NULL;
404
405 switch (errno) {
406 case -EIO:
407 errstr = "IO failure";
408 break;
409 case -ENOMEM:
410 errstr = "Out of memory";
411 break;
412 case -EROFS:
78f1ddbb
TT		 413 if (!sb || (EXT4_SB(sb)->s_journal &&
414 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 415 errstr = "Journal has aborted";
416 else
417 errstr = "Readonly filesystem";
418 break;
419 default:
420 /* If the caller passed in an extra buffer for unknown
421 * errors, textualise them now. Else we just return
422 * NULL. */
423 if (nbuf) {
424 /* Check for truncated error codes... */
425 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
426 errstr = nbuf;
427 }
428 break;
429 }
430
431 return errstr;
432}
433
617ba13b 434/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 435 * automatically and invokes the appropriate error response. */
436
2b2d6d01 437void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 438{
439 char nbuf[16];
440 const char *errstr;
441
442 /* Special case: if the error is EROFS, and we're not already
443 * inside a transaction, then there's really no point in logging
444 * an error. */
445 if (errno == -EROFS && journal_current_handle() == NULL &&
446 (sb->s_flags & MS_RDONLY))
447 return;
448
617ba13b 449 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 450 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
451 sb->s_id, function, errstr);
ac27a0ec 452
617ba13b 453 ext4_handle_error(sb);
ac27a0ec
DK		 454}
455
456/*
617ba13b 457 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 458 * abort function may be used to deal with unrecoverable failures such
459 * as journal IO errors or ENOMEM at a critical moment in log management.
460 *
461 * We unconditionally force the filesystem into an ABORT|READONLY state,
462 * unless the error response on the fs has been set to panic in which
463 * case we take the easy way out and panic immediately.
464 */
465
2b2d6d01
TT		 466void ext4_abort(struct super_block *sb, const char *function,
467 const char *fmt, ...)
ac27a0ec
DK		 468{
469 va_list args;
470
ac27a0ec 471 va_start(args, fmt);
2b2d6d01 472 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 473 vprintk(fmt, args);
474 printk("\n");
475 va_end(args);
476
477 if (test_opt(sb, ERRORS_PANIC))
617ba13b 478 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 479
480 if (sb->s_flags & MS_RDONLY)
481 return;
482
b31e1552 483 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
617ba13b 484 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 485 sb->s_flags |= MS_RDONLY;
4ab2f15b 486 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ef2cabf7
HK		 487 if (EXT4_SB(sb)->s_journal)
488 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 489}
490
b31e1552
ES		 491void ext4_msg (struct super_block * sb, const char *prefix,
492 const char *fmt, ...)
493{
494 va_list args;
495
496 va_start(args, fmt);
497 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
498 vprintk(fmt, args);
499 printk("\n");
500 va_end(args);
501}
502
12062ddd 503void __ext4_warning(struct super_block *sb, const char *function,
2b2d6d01 504 const char *fmt, ...)
ac27a0ec
DK		 505{
506 va_list args;
507
508 va_start(args, fmt);
617ba13b 509 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 510 sb->s_id, function);
511 vprintk(fmt, args);
512 printk("\n");
513 va_end(args);
514}
515
5d1b1b3f 516void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
0b8e58a1 517 const char *function, const char *fmt, ...)
5d1b1b3f
AK		 518__releases(bitlock)
519__acquires(bitlock)
520{
521 va_list args;
522 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
523
524 va_start(args, fmt);
525 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
526 vprintk(fmt, args);
527 printk("\n");
528 va_end(args);
529
530 if (test_opt(sb, ERRORS_CONT)) {
531 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
532 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 533 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 534 return;
535 }
536 ext4_unlock_group(sb, grp);
537 ext4_handle_error(sb);
538 /*
539 * We only get here in the ERRORS_RO case; relocking the group
540 * may be dangerous, but nothing bad will happen since the
541 * filesystem will have already been marked read/only and the
542 * journal has been aborted. We return 1 as a hint to callers
543 * who might what to use the return value from
544 * ext4_grp_locked_error() to distinguish beween the
545 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
546 * aggressively from the ext4 function in question, with a
547 * more appropriate error code.
548 */
549 ext4_lock_group(sb, grp);
550 return;
551}
552
617ba13b 553void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 554{
617ba13b 555 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 556
617ba13b 557 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 558 return;
559
12062ddd 560 ext4_warning(sb,
ac27a0ec
DK		 561 "updating to rev %d because of new feature flag, "
562 "running e2fsck is recommended",
617ba13b 563 EXT4_DYNAMIC_REV);
ac27a0ec 564
617ba13b
MC		 565 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
566 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
567 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 568 /* leave es->s_feature_*compat flags alone */
569 /* es->s_uuid will be set by e2fsck if empty */
570
571 /*
572 * The rest of the superblock fields should be zero, and if not it
573 * means they are likely already in use, so leave them alone. We
574 * can leave it up to e2fsck to clean up any inconsistencies there.
575 */
576}
577
578/*
579 * Open the external journal device
580 */
b31e1552 581static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 582{
583 struct block_device *bdev;
584 char b[BDEVNAME_SIZE];
585
586 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
587 if (IS_ERR(bdev))
588 goto fail;
589 return bdev;
590
591fail:
b31e1552 592 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 593 __bdevname(dev, b), PTR_ERR(bdev));
594 return NULL;
595}
596
597/*
598 * Release the journal device
599 */
617ba13b 600static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 601{
602 bd_release(bdev);
9a1c3542 603 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 604}
605
617ba13b 606static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 607{
608 struct block_device *bdev;
609 int ret = -ENODEV;
610
611 bdev = sbi->journal_bdev;
612 if (bdev) {
617ba13b 613 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 614 sbi->journal_bdev = NULL;
615 }
616 return ret;
617}
618
619static inline struct inode *orphan_list_entry(struct list_head *l)
620{
617ba13b 621 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 622}
623
617ba13b 624static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 625{
626 struct list_head *l;
627
b31e1552
ES		 628 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
629 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 630
631 printk(KERN_ERR "sb_info orphan list:\n");
632 list_for_each(l, &sbi->s_orphan) {
633 struct inode *inode = orphan_list_entry(l);
634 printk(KERN_ERR " "
635 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
636 inode->i_sb->s_id, inode->i_ino, inode,
637 inode->i_mode, inode->i_nlink,
638 NEXT_ORPHAN(inode));
639 }
640}
641
2b2d6d01 642static void ext4_put_super(struct super_block *sb)
ac27a0ec 643{
617ba13b
MC		 644 struct ext4_sb_info *sbi = EXT4_SB(sb);
645 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 646 int i, err;
ac27a0ec 647
4c0425ff
MC		 648 flush_workqueue(sbi->dio_unwritten_wq);
649 destroy_workqueue(sbi->dio_unwritten_wq);
650
a9e220f8 651 lock_super(sb);
6cfd0148 652 lock_kernel();
8c85e125 653 if (sb->s_dirt)
ebc1ac16 654 ext4_commit_super(sb, 1);
8c85e125 655
0390131b
FM		 656 if (sbi->s_journal) {
657 err = jbd2_journal_destroy(sbi->s_journal);
658 sbi->s_journal = NULL;
659 if (err < 0)
660 ext4_abort(sb, __func__,
661 "Couldn't clean up the journal");
662 }
d4edac31
JB		 663
664 ext4_release_system_zone(sb);
665 ext4_mb_release(sb);
666 ext4_ext_release(sb);
667 ext4_xattr_put_super(sb);
668
ac27a0ec 669 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 670 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 671 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 672 ext4_commit_super(sb, 1);
ac27a0ec 673 }
240799cd 674 if (sbi->s_proc) {
9f6200bb 675 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 676 }
3197ebdb 677 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 678
679 for (i = 0; i < sbi->s_gdb_count; i++)
680 brelse(sbi->s_group_desc[i]);
681 kfree(sbi->s_group_desc);
c5ca7c76
TT		 682 if (is_vmalloc_addr(sbi->s_flex_groups))
683 vfree(sbi->s_flex_groups);
684 else
685 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 686 percpu_counter_destroy(&sbi->s_freeblocks_counter);
687 percpu_counter_destroy(&sbi->s_freeinodes_counter);
688 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 689 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 690 brelse(sbi->s_sbh);
691#ifdef CONFIG_QUOTA
692 for (i = 0; i < MAXQUOTAS; i++)
693 kfree(sbi->s_qf_names[i]);
694#endif
695
696 /* Debugging code just in case the in-memory inode orphan list
697 * isn't empty. The on-disk one can be non-empty if we've
698 * detected an error and taken the fs readonly, but the
699 * in-memory list had better be clean by this point. */
700 if (!list_empty(&sbi->s_orphan))
701 dump_orphan_list(sb, sbi);
702 J_ASSERT(list_empty(&sbi->s_orphan));
703
f98393a6 704 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 705 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
706 /*
707 * Invalidate the journal device's buffers. We don't want them
708 * floating about in memory - the physical journal device may
709 * hotswapped, and it breaks the `ro-after' testing code.
710 */
711 sync_blockdev(sbi->journal_bdev);
f98393a6 712 invalidate_bdev(sbi->journal_bdev);
617ba13b 713 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 714 }
715 sb->s_fs_info = NULL;
3197ebdb
TT		 716 /*
717 * Now that we are completely done shutting down the
718 * superblock, we need to actually destroy the kobject.
719 */
720 unlock_kernel();
721 unlock_super(sb);
722 kobject_put(&sbi->s_kobj);
723 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 724 kfree(sbi->s_blockgroup_lock);
ac27a0ec 725 kfree(sbi);
ac27a0ec
DK		 726}
727
e18b890b 728static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 729
730/*
731 * Called inside transaction, so use GFP_NOFS
732 */
617ba13b 733static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 734{
617ba13b 735 struct ext4_inode_info *ei;
ac27a0ec 736
e6b4f8da 737 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 738 if (!ei)
739 return NULL;
0b8e58a1 740
ac27a0ec 741 ei->vfs_inode.i_version = 1;
91246c00 742 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 743 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 744 INIT_LIST_HEAD(&ei->i_prealloc_list);
745 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 746 /*
747 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
748 * therefore it can be null here. Don't check it, just initialize
749 * jinode.
750 */
678aaf48 751 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 752 ei->i_reserved_data_blocks = 0;
753 ei->i_reserved_meta_blocks = 0;
754 ei->i_allocated_meta_blocks = 0;
9d0be502 755 ei->i_da_metadata_calc_len = 0;
d2a17637
MC		 756 ei->i_delalloc_reserved_flag = 0;
757 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 758#ifdef CONFIG_QUOTA
759 ei->i_reserved_quota = 0;
760#endif
c7064ef1 761 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 762 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 763 ei->cur_aio_dio = NULL;
b436b9be
JK		 764 ei->i_sync_tid = 0;
765 ei->i_datasync_tid = 0;
0b8e58a1 766
ac27a0ec
DK		 767 return &ei->vfs_inode;
768}
769
617ba13b 770static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 771{
9f7dd93d 772 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 773 ext4_msg(inode->i_sb, KERN_ERR,
774 "Inode %lu (%p): orphan list check failed!",
775 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 776 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
777 EXT4_I(inode), sizeof(struct ext4_inode_info),
778 true);
779 dump_stack();
780 }
617ba13b 781 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 782}
783
51cc5068 784static void init_once(void *foo)
ac27a0ec 785{
617ba13b 786 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 787
a35afb83 788 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 789#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 790 init_rwsem(&ei->xattr_sem);
ac27a0ec 791#endif
0e855ac8 792 init_rwsem(&ei->i_data_sem);
a35afb83 793 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 794}
795
796static int init_inodecache(void)
797{
617ba13b
MC		 798 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
799 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 800 0, (SLAB_RECLAIM_ACCOUNT|
801 SLAB_MEM_SPREAD),
20c2df83 802 init_once);
617ba13b 803 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 804 return -ENOMEM;
805 return 0;
806}
807
808static void destroy_inodecache(void)
809{
617ba13b 810 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 811}
812
617ba13b 813static void ext4_clear_inode(struct inode *inode)
ac27a0ec 814{
9f754758 815 dquot_drop(inode);
c2ea3fde 816 ext4_discard_preallocations(inode);
0390131b
FM		 817 if (EXT4_JOURNAL(inode))
818 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 819 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 820}
821
2b2d6d01
TT		 822static inline void ext4_show_quota_options(struct seq_file *seq,
823 struct super_block *sb)
ac27a0ec
DK		 824{
825#if defined(CONFIG_QUOTA)
617ba13b 826 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 827
5a20bdfc
JK		 828 if (sbi->s_jquota_fmt) {
829 char *fmtname = "";
830
831 switch (sbi->s_jquota_fmt) {
832 case QFMT_VFS_OLD:
833 fmtname = "vfsold";
834 break;
835 case QFMT_VFS_V0:
836 fmtname = "vfsv0";
837 break;
838 case QFMT_VFS_V1:
839 fmtname = "vfsv1";
840 break;
841 }
842 seq_printf(seq, ",jqfmt=%s", fmtname);
843 }
ac27a0ec
DK		 844
845 if (sbi->s_qf_names[USRQUOTA])
846 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
847
848 if (sbi->s_qf_names[GRPQUOTA])
849 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
850
482a7425 851 if (test_opt(sb, USRQUOTA))
ac27a0ec
DK		 852 seq_puts(seq, ",usrquota");
853
482a7425 854 if (test_opt(sb, GRPQUOTA))
ac27a0ec
DK		 855 seq_puts(seq, ",grpquota");
856#endif
857}
858
d9c9bef1
MS		 859/*
860 * Show an option if
861 * - it's set to a non-default value OR
862 * - if the per-sb default is different from the global default
863 */
617ba13b 864static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 865{
aa22df2c
AK		 866 int def_errors;
867 unsigned long def_mount_opts;
ac27a0ec 868 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 869 struct ext4_sb_info *sbi = EXT4_SB(sb);
870 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 871
872 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 873 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 874
875 if (sbi->s_sb_block != 1)
876 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
877 if (test_opt(sb, MINIX_DF))
878 seq_puts(seq, ",minixdf");
aa22df2c 879 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 880 seq_puts(seq, ",grpid");
881 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
882 seq_puts(seq, ",nogrpid");
883 if (sbi->s_resuid != EXT4_DEF_RESUID ||
884 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
885 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
886 }
887 if (sbi->s_resgid != EXT4_DEF_RESGID ||
888 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
889 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
890 }
bb4f397a 891 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 892 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 893 def_errors == EXT4_ERRORS_CONTINUE) {
894 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 895 }
896 }
aa22df2c 897 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 898 seq_puts(seq, ",errors=continue");
aa22df2c 899 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 900 seq_puts(seq, ",errors=panic");
aa22df2c 901 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 902 seq_puts(seq, ",nouid32");
aa22df2c 903 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 904 seq_puts(seq, ",debug");
905 if (test_opt(sb, OLDALLOC))
906 seq_puts(seq, ",oldalloc");
03010a33 907#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 908 if (test_opt(sb, XATTR_USER) &&
909 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 910 seq_puts(seq, ",user_xattr");
911 if (!test_opt(sb, XATTR_USER) &&
912 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
913 seq_puts(seq, ",nouser_xattr");
914 }
915#endif
03010a33 916#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 917 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 918 seq_puts(seq, ",acl");
919 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
920 seq_puts(seq, ",noacl");
921#endif
30773840 922 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 923 seq_printf(seq, ",commit=%u",
924 (unsigned) (sbi->s_commit_interval / HZ));
925 }
30773840
TT		 926 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
927 seq_printf(seq, ",min_batch_time=%u",
928 (unsigned) sbi->s_min_batch_time);
929 }
930 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
931 seq_printf(seq, ",max_batch_time=%u",
932 (unsigned) sbi->s_min_batch_time);
933 }
934
571640ca
ES		 935 /*
936 * We're changing the default of barrier mount option, so
937 * let's always display its mount state so it's clear what its
938 * status is.
939 */
940 seq_puts(seq, ",barrier=");
941 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 942 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
943 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 944 if (test_opt(sb, NOBH))
945 seq_puts(seq, ",nobh");
25ec56b5
JNC		 946 if (test_opt(sb, I_VERSION))
947 seq_puts(seq, ",i_version");
dd919b98
AK		 948 if (!test_opt(sb, DELALLOC))
949 seq_puts(seq, ",nodelalloc");
950
ac27a0ec 951
cb45bbe4
MS		 952 if (sbi->s_stripe)
953 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 954 /*
955 * journal mode get enabled in different ways
956 * So just print the value even if we didn't specify it
957 */
617ba13b 958 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 959 seq_puts(seq, ",data=journal");
617ba13b 960 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 961 seq_puts(seq, ",data=ordered");
617ba13b 962 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 963 seq_puts(seq, ",data=writeback");
964
240799cd
TT		 965 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
966 seq_printf(seq, ",inode_readahead_blks=%u",
967 sbi->s_inode_readahead_blks);
968
5bf5683a
HK		 969 if (test_opt(sb, DATA_ERR_ABORT))
970 seq_puts(seq, ",data_err=abort");
971
afd4672d 972 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 973 seq_puts(seq, ",noauto_da_alloc");
afd4672d 974
5328e635
ES		 975 if (test_opt(sb, DISCARD))
976 seq_puts(seq, ",discard");
977
e3bb52ae
ES		 978 if (test_opt(sb, NOLOAD))
979 seq_puts(seq, ",norecovery");
980
744692dc
JZ		 981 if (test_opt(sb, DIOREAD_NOLOCK))
982 seq_puts(seq, ",dioread_nolock");
983
617ba13b 984 ext4_show_quota_options(seq, sb);
0b8e58a1 985
ac27a0ec
DK		 986 return 0;
987}
988
1b961ac0 989static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 990 u64 ino, u32 generation)
ac27a0ec 991{
ac27a0ec 992 struct inode *inode;
ac27a0ec 993
617ba13b 994 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 995 return ERR_PTR(-ESTALE);
617ba13b 996 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 997 return ERR_PTR(-ESTALE);
998
999 /* iget isn't really right if the inode is currently unallocated!!
1000 *
617ba13b 1001 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1002 * deleted, so we should be safe.
1003 *
1004 * Currently we don't know the generation for parent directory, so
1005 * a generation of 0 means "accept any"
1006 */
1d1fe1ee
DH		 1007 inode = ext4_iget(sb, ino);
1008 if (IS_ERR(inode))
1009 return ERR_CAST(inode);
1010 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1011 iput(inode);
1012 return ERR_PTR(-ESTALE);
1013 }
1b961ac0
CH		 1014
1015 return inode;
1016}
1017
1018static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1019 int fh_len, int fh_type)
1b961ac0
CH		 1020{
1021 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1022 ext4_nfs_get_inode);
1023}
1024
1025static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1026 int fh_len, int fh_type)
1b961ac0
CH		 1027{
1028 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1029 ext4_nfs_get_inode);
ac27a0ec
DK		 1030}
1031
c39a7f84
TO		 1032/*
1033 * Try to release metadata pages (indirect blocks, directories) which are
1034 * mapped via the block device. Since these pages could have journal heads
1035 * which would prevent try_to_free_buffers() from freeing them, we must use
1036 * jbd2 layer's try_to_free_buffers() function to release them.
1037 */
0b8e58a1
AD		 1038static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1039 gfp_t wait)
c39a7f84
TO		 1040{
1041 journal_t *journal = EXT4_SB(sb)->s_journal;
1042
1043 WARN_ON(PageChecked(page));
1044 if (!page_has_buffers(page))
1045 return 0;
1046 if (journal)
1047 return jbd2_journal_try_to_free_buffers(journal, page,
1048 wait & ~__GFP_WAIT);
1049 return try_to_free_buffers(page);
1050}
1051
ac27a0ec 1052#ifdef CONFIG_QUOTA
af5bc92d 1053#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1054#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1055
617ba13b
MC		 1056static int ext4_write_dquot(struct dquot *dquot);
1057static int ext4_acquire_dquot(struct dquot *dquot);
1058static int ext4_release_dquot(struct dquot *dquot);
1059static int ext4_mark_dquot_dirty(struct dquot *dquot);
1060static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 1061static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1062 char *path, int remount);
617ba13b
MC		 1063static int ext4_quota_on_mount(struct super_block *sb, int type);
1064static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1065 size_t len, loff_t off);
617ba13b 1066static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1067 const char *data, size_t len, loff_t off);
1068
61e225dc 1069static const struct dquot_operations ext4_quota_operations = {
a9e7f447 1070#ifdef CONFIG_QUOTA
60e58e0f 1071 .get_reserved_space = ext4_get_reserved_space,
a9e7f447 1072#endif
617ba13b
MC		 1073 .write_dquot = ext4_write_dquot,
1074 .acquire_dquot = ext4_acquire_dquot,
1075 .release_dquot = ext4_release_dquot,
1076 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1077 .write_info = ext4_write_info,
1078 .alloc_dquot = dquot_alloc,
1079 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1080};
1081
0d54b217 1082static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1083 .quota_on = ext4_quota_on,
ac27a0ec
DK		 1084 .quota_off = vfs_quota_off,
1085 .quota_sync = vfs_quota_sync,
1086 .get_info = vfs_get_dqinfo,
1087 .set_info = vfs_set_dqinfo,
1088 .get_dqblk = vfs_get_dqblk,
1089 .set_dqblk = vfs_set_dqblk
1090};
1091#endif
1092
ee9b6d61 1093static const struct super_operations ext4_sops = {
617ba13b
MC		 1094 .alloc_inode = ext4_alloc_inode,
1095 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1096 .write_inode = ext4_write_inode,
1097 .dirty_inode = ext4_dirty_inode,
1098 .delete_inode = ext4_delete_inode,
1099 .put_super = ext4_put_super,
617ba13b 1100 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1101 .freeze_fs = ext4_freeze,
1102 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1103 .statfs = ext4_statfs,
1104 .remount_fs = ext4_remount,
1105 .clear_inode = ext4_clear_inode,
1106 .show_options = ext4_show_options,
ac27a0ec 1107#ifdef CONFIG_QUOTA
617ba13b
MC		 1108 .quota_read = ext4_quota_read,
1109 .quota_write = ext4_quota_write,
ac27a0ec 1110#endif
c39a7f84 1111 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1112};
1113
9ca92389
TT		 1114static const struct super_operations ext4_nojournal_sops = {
1115 .alloc_inode = ext4_alloc_inode,
1116 .destroy_inode = ext4_destroy_inode,
1117 .write_inode = ext4_write_inode,
1118 .dirty_inode = ext4_dirty_inode,
1119 .delete_inode = ext4_delete_inode,
1120 .write_super = ext4_write_super,
1121 .put_super = ext4_put_super,
1122 .statfs = ext4_statfs,
1123 .remount_fs = ext4_remount,
1124 .clear_inode = ext4_clear_inode,
1125 .show_options = ext4_show_options,
1126#ifdef CONFIG_QUOTA
1127 .quota_read = ext4_quota_read,
1128 .quota_write = ext4_quota_write,
1129#endif
1130 .bdev_try_to_free_page = bdev_try_to_free_page,
1131};
1132
39655164 1133static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1134 .fh_to_dentry = ext4_fh_to_dentry,
1135 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1136 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1137};
1138
1139enum {
1140 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1141 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1142 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1143 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1144 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1145 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1146 Opt_journal_update, Opt_journal_dev,
818d276c 1147 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1148 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1149 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1150 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1151 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1152 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1153 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1154 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
6fd058f7 1155 Opt_block_validity, Opt_noblock_validity,
5328e635 1156 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1157 Opt_dioread_nolock, Opt_dioread_lock,
5328e635 1158 Opt_discard, Opt_nodiscard,
ac27a0ec
DK		 1159};
1160
a447c093 1161static const match_table_t tokens = {
ac27a0ec
DK		 1162 {Opt_bsd_df, "bsddf"},
1163 {Opt_minix_df, "minixdf"},
1164 {Opt_grpid, "grpid"},
1165 {Opt_grpid, "bsdgroups"},
1166 {Opt_nogrpid, "nogrpid"},
1167 {Opt_nogrpid, "sysvgroups"},
1168 {Opt_resgid, "resgid=%u"},
1169 {Opt_resuid, "resuid=%u"},
1170 {Opt_sb, "sb=%u"},
1171 {Opt_err_cont, "errors=continue"},
1172 {Opt_err_panic, "errors=panic"},
1173 {Opt_err_ro, "errors=remount-ro"},
1174 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1175 {Opt_debug, "debug"},
1176 {Opt_oldalloc, "oldalloc"},
1177 {Opt_orlov, "orlov"},
1178 {Opt_user_xattr, "user_xattr"},
1179 {Opt_nouser_xattr, "nouser_xattr"},
1180 {Opt_acl, "acl"},
1181 {Opt_noacl, "noacl"},
ac27a0ec 1182 {Opt_noload, "noload"},
e3bb52ae 1183 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1184 {Opt_nobh, "nobh"},
1185 {Opt_bh, "bh"},
1186 {Opt_commit, "commit=%u"},
30773840
TT		 1187 {Opt_min_batch_time, "min_batch_time=%u"},
1188 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1189 {Opt_journal_update, "journal=update"},
ac27a0ec 1190 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1191 {Opt_journal_checksum, "journal_checksum"},
1192 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1193 {Opt_abort, "abort"},
1194 {Opt_data_journal, "data=journal"},
1195 {Opt_data_ordered, "data=ordered"},
1196 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1197 {Opt_data_err_abort, "data_err=abort"},
1198 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1199 {Opt_offusrjquota, "usrjquota="},
1200 {Opt_usrjquota, "usrjquota=%s"},
1201 {Opt_offgrpjquota, "grpjquota="},
1202 {Opt_grpjquota, "grpjquota=%s"},
1203 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1204 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1205 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1206 {Opt_grpquota, "grpquota"},
1207 {Opt_noquota, "noquota"},
1208 {Opt_quota, "quota"},
1209 {Opt_usrquota, "usrquota"},
1210 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1211 {Opt_barrier, "barrier"},
1212 {Opt_nobarrier, "nobarrier"},
25ec56b5 1213 {Opt_i_version, "i_version"},
c9de560d 1214 {Opt_stripe, "stripe=%u"},
ac27a0ec 1215 {Opt_resize, "resize"},
64769240 1216 {Opt_delalloc, "delalloc"},
dd919b98 1217 {Opt_nodelalloc, "nodelalloc"},
6fd058f7
TT		 1218 {Opt_block_validity, "block_validity"},
1219 {Opt_noblock_validity, "noblock_validity"},
240799cd 1220 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1221 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1222 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1223 {Opt_auto_da_alloc, "auto_da_alloc"},
1224 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1225 {Opt_dioread_nolock, "dioread_nolock"},
1226 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1227 {Opt_discard, "discard"},
1228 {Opt_nodiscard, "nodiscard"},
f3f12faa 1229 {Opt_err, NULL},
ac27a0ec
DK		 1230};
1231
617ba13b 1232static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1233{
617ba13b 1234 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1235 char *options = (char *) *data;
1236
1237 if (!options || strncmp(options, "sb=", 3) != 0)
1238 return 1; /* Default location */
0b8e58a1 1239
ac27a0ec 1240 options += 3;
0b8e58a1 1241 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1242 sb_block = simple_strtoul(options, &options, 0);
1243 if (*options && *options != ',') {
4776004f 1244 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1245 (char *) *data);
1246 return 1;
1247 }
1248 if (*options == ',')
1249 options++;
1250 *data = (void *) options;
0b8e58a1 1251
ac27a0ec
DK		 1252 return sb_block;
1253}
1254
b3881f74 1255#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1256static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1257 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1258
56c50f11
DM		 1259#ifdef CONFIG_QUOTA
1260static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1261{
1262 struct ext4_sb_info *sbi = EXT4_SB(sb);
1263 char *qname;
1264
1265 if (sb_any_quota_loaded(sb) &&
1266 !sbi->s_qf_names[qtype]) {
1267 ext4_msg(sb, KERN_ERR,
1268 "Cannot change journaled "
1269 "quota options when quota turned on");
1270 return 0;
1271 }
1272 qname = match_strdup(args);
1273 if (!qname) {
1274 ext4_msg(sb, KERN_ERR,
1275 "Not enough memory for storing quotafile name");
1276 return 0;
1277 }
1278 if (sbi->s_qf_names[qtype] &&
1279 strcmp(sbi->s_qf_names[qtype], qname)) {
1280 ext4_msg(sb, KERN_ERR,
1281 "%s quota file already specified", QTYPE2NAME(qtype));
1282 kfree(qname);
1283 return 0;
1284 }
1285 sbi->s_qf_names[qtype] = qname;
1286 if (strchr(sbi->s_qf_names[qtype], '/')) {
1287 ext4_msg(sb, KERN_ERR,
1288 "quotafile must be on filesystem root");
1289 kfree(sbi->s_qf_names[qtype]);
1290 sbi->s_qf_names[qtype] = NULL;
1291 return 0;
1292 }
1293 set_opt(sbi->s_mount_opt, QUOTA);
1294 return 1;
1295}
1296
1297static int clear_qf_name(struct super_block *sb, int qtype)
1298{
1299
1300 struct ext4_sb_info *sbi = EXT4_SB(sb);
1301
1302 if (sb_any_quota_loaded(sb) &&
1303 sbi->s_qf_names[qtype]) {
1304 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1305 " when quota turned on");
1306 return 0;
1307 }
1308 /*
1309 * The space will be released later when all options are confirmed
1310 * to be correct
1311 */
1312 sbi->s_qf_names[qtype] = NULL;
1313 return 1;
1314}
1315#endif
1316
2b2d6d01 1317static int parse_options(char *options, struct super_block *sb,
c3191067 1318 unsigned long *journal_devnum,
b3881f74 1319 unsigned int *journal_ioprio,
2b2d6d01 1320 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1321{
617ba13b 1322 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1323 char *p;
ac27a0ec
DK		 1324 substring_t args[MAX_OPT_ARGS];
1325 int data_opt = 0;
1326 int option;
1327#ifdef CONFIG_QUOTA
56c50f11 1328 int qfmt;
ac27a0ec
DK		 1329#endif
1330
1331 if (!options)
1332 return 1;
1333
2b2d6d01 1334 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1335 int token;
1336 if (!*p)
1337 continue;
1338
15121c18
ES		 1339 /*
1340 * Initialize args struct so we know whether arg was
1341 * found; some options take optional arguments.
1342 */
1343 args[0].to = args[0].from = 0;
ac27a0ec
DK		 1344 token = match_token(p, tokens, args);
1345 switch (token) {
1346 case Opt_bsd_df:
437ca0fd 1347 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1348 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1349 break;
1350 case Opt_minix_df:
437ca0fd 1351 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1352 set_opt(sbi->s_mount_opt, MINIX_DF);
437ca0fd 1353
ac27a0ec
DK		 1354 break;
1355 case Opt_grpid:
437ca0fd 1356 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1357 set_opt(sbi->s_mount_opt, GRPID);
437ca0fd 1358
ac27a0ec
DK		 1359 break;
1360 case Opt_nogrpid:
437ca0fd 1361 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1362 clear_opt(sbi->s_mount_opt, GRPID);
437ca0fd 1363
ac27a0ec
DK		 1364 break;
1365 case Opt_resuid:
1366 if (match_int(&args[0], &option))
1367 return 0;
1368 sbi->s_resuid = option;
1369 break;
1370 case Opt_resgid:
1371 if (match_int(&args[0], &option))
1372 return 0;
1373 sbi->s_resgid = option;
1374 break;
1375 case Opt_sb:
1376 /* handled by get_sb_block() instead of here */
1377 /* *sb_block = match_int(&args[0]); */
1378 break;
1379 case Opt_err_panic:
2b2d6d01
TT		 1380 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1381 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1382 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1383 break;
1384 case Opt_err_ro:
2b2d6d01
TT		 1385 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1386 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1387 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1388 break;
1389 case Opt_err_cont:
2b2d6d01
TT		 1390 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1391 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1392 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1393 break;
1394 case Opt_nouid32:
2b2d6d01 1395 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1396 break;
ac27a0ec 1397 case Opt_debug:
2b2d6d01 1398 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1399 break;
1400 case Opt_oldalloc:
2b2d6d01 1401 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1402 break;
1403 case Opt_orlov:
2b2d6d01 1404 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1405 break;
03010a33 1406#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1407 case Opt_user_xattr:
2b2d6d01 1408 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1409 break;
1410 case Opt_nouser_xattr:
2b2d6d01 1411 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1412 break;
1413#else
1414 case Opt_user_xattr:
1415 case Opt_nouser_xattr:
b31e1552 1416 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1417 break;
1418#endif
03010a33 1419#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1420 case Opt_acl:
1421 set_opt(sbi->s_mount_opt, POSIX_ACL);
1422 break;
1423 case Opt_noacl:
1424 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1425 break;
1426#else
1427 case Opt_acl:
1428 case Opt_noacl:
b31e1552 1429 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1430 break;
1431#endif
ac27a0ec
DK		 1432 case Opt_journal_update:
1433 /* @@@ FIXME */
1434 /* Eventually we will want to be able to create
1435 a journal file here. For now, only allow the
1436 user to specify an existing inode to be the
1437 journal file. */
1438 if (is_remount) {
b31e1552
ES		 1439 ext4_msg(sb, KERN_ERR,
1440 "Cannot specify journal on remount");
ac27a0ec
DK		 1441 return 0;
1442 }
2b2d6d01 1443 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1444 break;
ac27a0ec
DK		 1445 case Opt_journal_dev:
1446 if (is_remount) {
b31e1552
ES		 1447 ext4_msg(sb, KERN_ERR,
1448 "Cannot specify journal on remount");
ac27a0ec
DK		 1449 return 0;
1450 }
1451 if (match_int(&args[0], &option))
1452 return 0;
1453 *journal_devnum = option;
1454 break;
818d276c 1455 case Opt_journal_checksum:
d4da6c9c
LT		 1456 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1457 break;
818d276c
GS		 1458 case Opt_journal_async_commit:
1459 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
d4da6c9c 1460 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
818d276c 1461 break;
ac27a0ec 1462 case Opt_noload:
2b2d6d01 1463 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1464 break;
1465 case Opt_commit:
1466 if (match_int(&args[0], &option))
1467 return 0;
1468 if (option < 0)
1469 return 0;
1470 if (option == 0)
cd02ff0b 1471 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1472 sbi->s_commit_interval = HZ * option;
1473 break;
30773840
TT		 1474 case Opt_max_batch_time:
1475 if (match_int(&args[0], &option))
1476 return 0;
1477 if (option < 0)
1478 return 0;
1479 if (option == 0)
1480 option = EXT4_DEF_MAX_BATCH_TIME;
1481 sbi->s_max_batch_time = option;
1482 break;
1483 case Opt_min_batch_time:
1484 if (match_int(&args[0], &option))
1485 return 0;
1486 if (option < 0)
1487 return 0;
1488 sbi->s_min_batch_time = option;
1489 break;
ac27a0ec 1490 case Opt_data_journal:
617ba13b 1491 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1492 goto datacheck;
1493 case Opt_data_ordered:
617ba13b 1494 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1495 goto datacheck;
1496 case Opt_data_writeback:
617ba13b 1497 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1498 datacheck:
1499 if (is_remount) {
482a7425 1500 if (test_opt(sb, DATA_FLAGS) != data_opt) {
b31e1552
ES		 1501 ext4_msg(sb, KERN_ERR,
1502 "Cannot change data mode on remount");
ac27a0ec
DK		 1503 return 0;
1504 }
1505 } else {
482a7425 1506 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
ac27a0ec
DK		 1507 sbi->s_mount_opt |= data_opt;
1508 }
1509 break;
5bf5683a
HK		 1510 case Opt_data_err_abort:
1511 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1512 break;
1513 case Opt_data_err_ignore:
1514 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1515 break;
ac27a0ec
DK		 1516#ifdef CONFIG_QUOTA
1517 case Opt_usrjquota:
56c50f11 1518 if (!set_qf_name(sb, USRQUOTA, &args[0]))
ac27a0ec 1519 return 0;
56c50f11
DM		 1520 break;
1521 case Opt_grpjquota:
1522 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
ac27a0ec 1523 return 0;
ac27a0ec
DK		 1524 break;
1525 case Opt_offusrjquota:
56c50f11
DM		 1526 if (!clear_qf_name(sb, USRQUOTA))
1527 return 0;
1528 break;
ac27a0ec 1529 case Opt_offgrpjquota:
56c50f11 1530 if (!clear_qf_name(sb, GRPQUOTA))
ac27a0ec 1531 return 0;
ac27a0ec 1532 break;
56c50f11 1533
ac27a0ec 1534 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1535 qfmt = QFMT_VFS_OLD;
1536 goto set_qf_format;
ac27a0ec 1537 case Opt_jqfmt_vfsv0:
dfc5d03f 1538 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1539 goto set_qf_format;
1540 case Opt_jqfmt_vfsv1:
1541 qfmt = QFMT_VFS_V1;
dfc5d03f 1542set_qf_format:
17bd13b3 1543 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1544 sbi->s_jquota_fmt != qfmt) {
b31e1552 1545 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1546 "journaled quota options when "
b31e1552 1547 "quota turned on");
dfc5d03f
JK		 1548 return 0;
1549 }
1550 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1551 break;
1552 case Opt_quota:
1553 case Opt_usrquota:
1554 set_opt(sbi->s_mount_opt, QUOTA);
1555 set_opt(sbi->s_mount_opt, USRQUOTA);
1556 break;
1557 case Opt_grpquota:
1558 set_opt(sbi->s_mount_opt, QUOTA);
1559 set_opt(sbi->s_mount_opt, GRPQUOTA);
1560 break;
1561 case Opt_noquota:
17bd13b3 1562 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1563 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1564 "options when quota turned on");
ac27a0ec
DK		 1565 return 0;
1566 }
1567 clear_opt(sbi->s_mount_opt, QUOTA);
1568 clear_opt(sbi->s_mount_opt, USRQUOTA);
1569 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1570 break;
1571#else
1572 case Opt_quota:
1573 case Opt_usrquota:
1574 case Opt_grpquota:
b31e1552
ES		 1575 ext4_msg(sb, KERN_ERR,
1576 "quota options not supported");
cd59e7b9 1577 break;
ac27a0ec
DK		 1578 case Opt_usrjquota:
1579 case Opt_grpjquota:
1580 case Opt_offusrjquota:
1581 case Opt_offgrpjquota:
1582 case Opt_jqfmt_vfsold:
1583 case Opt_jqfmt_vfsv0:
5a20bdfc 1584 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1585 ext4_msg(sb, KERN_ERR,
1586 "journaled quota options not supported");
ac27a0ec
DK		 1587 break;
1588 case Opt_noquota:
1589 break;
1590#endif
1591 case Opt_abort:
4ab2f15b 1592 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1593 break;
06705bff
TT		 1594 case Opt_nobarrier:
1595 clear_opt(sbi->s_mount_opt, BARRIER);
1596 break;
ac27a0ec 1597 case Opt_barrier:
15121c18
ES		 1598 if (args[0].from) {
1599 if (match_int(&args[0], &option))
1600 return 0;
1601 } else
1602 option = 1; /* No argument, default to 1 */
ac27a0ec
DK		 1603 if (option)
1604 set_opt(sbi->s_mount_opt, BARRIER);
1605 else
1606 clear_opt(sbi->s_mount_opt, BARRIER);
1607 break;
1608 case Opt_ignore:
1609 break;
1610 case Opt_resize:
1611 if (!is_remount) {
b31e1552
ES		 1612 ext4_msg(sb, KERN_ERR,
1613 "resize option only available "
1614 "for remount");
ac27a0ec
DK		 1615 return 0;
1616 }
1617 if (match_int(&args[0], &option) != 0)
1618 return 0;
1619 *n_blocks_count = option;
1620 break;
1621 case Opt_nobh:
1622 set_opt(sbi->s_mount_opt, NOBH);
1623 break;
1624 case Opt_bh:
1625 clear_opt(sbi->s_mount_opt, NOBH);
1626 break;
25ec56b5
JNC		 1627 case Opt_i_version:
1628 set_opt(sbi->s_mount_opt, I_VERSION);
1629 sb->s_flags |= MS_I_VERSION;
1630 break;
dd919b98
AK		 1631 case Opt_nodelalloc:
1632 clear_opt(sbi->s_mount_opt, DELALLOC);
1633 break;
c9de560d
AT		 1634 case Opt_stripe:
1635 if (match_int(&args[0], &option))
1636 return 0;
1637 if (option < 0)
1638 return 0;
1639 sbi->s_stripe = option;
1640 break;
64769240
AT		 1641 case Opt_delalloc:
1642 set_opt(sbi->s_mount_opt, DELALLOC);
1643 break;
6fd058f7
TT		 1644 case Opt_block_validity:
1645 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1646 break;
1647 case Opt_noblock_validity:
1648 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1649 break;
240799cd
TT		 1650 case Opt_inode_readahead_blks:
1651 if (match_int(&args[0], &option))
1652 return 0;
1653 if (option < 0 || option > (1 << 30))
1654 return 0;
f7c43950 1655 if (!is_power_of_2(option)) {
b31e1552
ES		 1656 ext4_msg(sb, KERN_ERR,
1657 "EXT4-fs: inode_readahead_blks"
1658 " must be a power of 2");
3197ebdb
TT		 1659 return 0;
1660 }
240799cd
TT		 1661 sbi->s_inode_readahead_blks = option;
1662 break;
b3881f74
TT		 1663 case Opt_journal_ioprio:
1664 if (match_int(&args[0], &option))
1665 return 0;
1666 if (option < 0 || option > 7)
1667 break;
1668 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1669 option);
1670 break;
06705bff
TT		 1671 case Opt_noauto_da_alloc:
1672 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1673 break;
afd4672d 1674 case Opt_auto_da_alloc:
15121c18
ES		 1675 if (args[0].from) {
1676 if (match_int(&args[0], &option))
1677 return 0;
1678 } else
1679 option = 1; /* No argument, default to 1 */
afd4672d
TT		 1680 if (option)
1681 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1682 else
1683 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1684 break;
5328e635
ES		 1685 case Opt_discard:
1686 set_opt(sbi->s_mount_opt, DISCARD);
1687 break;
1688 case Opt_nodiscard:
1689 clear_opt(sbi->s_mount_opt, DISCARD);
1690 break;
744692dc
JZ		 1691 case Opt_dioread_nolock:
1692 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1693 break;
1694 case Opt_dioread_lock:
1695 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1696 break;
ac27a0ec 1697 default:
b31e1552
ES		 1698 ext4_msg(sb, KERN_ERR,
1699 "Unrecognized mount option \"%s\" "
1700 "or missing value", p);
ac27a0ec
DK		 1701 return 0;
1702 }
1703 }
1704#ifdef CONFIG_QUOTA
1705 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1706 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
ac27a0ec
DK		 1707 clear_opt(sbi->s_mount_opt, USRQUOTA);
1708
482a7425 1709 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
ac27a0ec
DK		 1710 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1711
56c50f11 1712 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1713 ext4_msg(sb, KERN_ERR, "old and new quota "
1714 "format mixing");
ac27a0ec
DK		 1715 return 0;
1716 }
1717
1718 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1719 ext4_msg(sb, KERN_ERR, "journaled quota format "
1720 "not specified");
ac27a0ec
DK		 1721 return 0;
1722 }
1723 } else {
1724 if (sbi->s_jquota_fmt) {
b31e1552 1725 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1726 "specified with no journaling "
b31e1552 1727 "enabled");
ac27a0ec
DK		 1728 return 0;
1729 }
1730 }
1731#endif
1732 return 1;
1733}
1734
617ba13b 1735static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1736 int read_only)
1737{
617ba13b 1738 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1739 int res = 0;
1740
617ba13b 1741 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1742 ext4_msg(sb, KERN_ERR, "revision level too high, "
1743 "forcing read-only mode");
ac27a0ec
DK		 1744 res = MS_RDONLY;
1745 }
1746 if (read_only)
1747 return res;
617ba13b 1748 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1749 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1750 "running e2fsck is recommended");
617ba13b 1751 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1752 ext4_msg(sb, KERN_WARNING,
1753 "warning: mounting fs with errors, "
1754 "running e2fsck is recommended");
ac27a0ec
DK		 1755 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1756 le16_to_cpu(es->s_mnt_count) >=
1757 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1758 ext4_msg(sb, KERN_WARNING,
1759 "warning: maximal mount count reached, "
1760 "running e2fsck is recommended");
ac27a0ec
DK		 1761 else if (le32_to_cpu(es->s_checkinterval) &&
1762 (le32_to_cpu(es->s_lastcheck) +
1763 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1764 ext4_msg(sb, KERN_WARNING,
1765 "warning: checktime reached, "
1766 "running e2fsck is recommended");
0b8e58a1 1767 if (!sbi->s_journal)
0390131b 1768 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1769 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1770 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1771 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1772 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1773 ext4_update_dynamic_rev(sb);
0390131b
FM		 1774 if (sbi->s_journal)
1775 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1776
e2d67052 1777 ext4_commit_super(sb, 1);
ac27a0ec 1778 if (test_opt(sb, DEBUG))
a9df9a49 1779 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
7f4520cc 1780 "bpg=%lu, ipg=%lu, mo=%04x]\n",
ac27a0ec
DK		 1781 sb->s_blocksize,
1782 sbi->s_groups_count,
617ba13b
MC		 1783 EXT4_BLOCKS_PER_GROUP(sb),
1784 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1785 sbi->s_mount_opt);
1786
ac27a0ec
DK		 1787 return res;
1788}
1789
772cb7c8
JS		 1790static int ext4_fill_flex_info(struct super_block *sb)
1791{
1792 struct ext4_sb_info *sbi = EXT4_SB(sb);
1793 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1794 ext4_group_t flex_group_count;
1795 ext4_group_t flex_group;
1796 int groups_per_flex = 0;
c5ca7c76 1797 size_t size;
772cb7c8
JS		 1798 int i;
1799
503358ae
TT		 1800 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1801 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1802
1803 if (groups_per_flex < 2) {
772cb7c8
JS		 1804 sbi->s_log_groups_per_flex = 0;
1805 return 1;
1806 }
1807
c62a11fd
FB		 1808 /* We allocate both existing and potentially added groups */
1809 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1810 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1811 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1812 size = flex_group_count * sizeof(struct flex_groups);
1813 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1814 if (sbi->s_flex_groups == NULL) {
1815 sbi->s_flex_groups = vmalloc(size);
1816 if (sbi->s_flex_groups)
1817 memset(sbi->s_flex_groups, 0, size);
1818 }
772cb7c8 1819 if (sbi->s_flex_groups == NULL) {
b31e1552
ES		 1820 ext4_msg(sb, KERN_ERR, "not enough memory for "
1821 "%u flex groups", flex_group_count);
772cb7c8
JS		 1822 goto failed;
1823 }
772cb7c8 1824
772cb7c8 1825 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1826 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1827
1828 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1829 atomic_add(ext4_free_inodes_count(sb, gdp),
1830 &sbi->s_flex_groups[flex_group].free_inodes);
1831 atomic_add(ext4_free_blks_count(sb, gdp),
1832 &sbi->s_flex_groups[flex_group].free_blocks);
1833 atomic_add(ext4_used_dirs_count(sb, gdp),
1834 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1835 }
1836
1837 return 1;
1838failed:
1839 return 0;
1840}
1841
717d50e4
AD		 1842__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1843 struct ext4_group_desc *gdp)
1844{
1845 __u16 crc = 0;
1846
1847 if (sbi->s_es->s_feature_ro_compat &
1848 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1849 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1850 __le32 le_group = cpu_to_le32(block_group);
1851
1852 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1853 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1854 crc = crc16(crc, (__u8 *)gdp, offset);
1855 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1856 /* for checksum of struct ext4_group_desc do the rest...*/
1857 if ((sbi->s_es->s_feature_incompat &
1858 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1859 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1860 crc = crc16(crc, (__u8 *)gdp + offset,
1861 le16_to_cpu(sbi->s_es->s_desc_size) -
1862 offset);
1863 }
1864
1865 return cpu_to_le16(crc);
1866}
1867
1868int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1869 struct ext4_group_desc *gdp)
1870{
1871 if ((sbi->s_es->s_feature_ro_compat &
1872 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1873 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1874 return 0;
1875
1876 return 1;
1877}
1878
ac27a0ec 1879/* Called at mount-time, super-block is locked */
197cd65a 1880static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1881{
617ba13b
MC		 1882 struct ext4_sb_info *sbi = EXT4_SB(sb);
1883 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1884 ext4_fsblk_t last_block;
bd81d8ee
LV		 1885 ext4_fsblk_t block_bitmap;
1886 ext4_fsblk_t inode_bitmap;
1887 ext4_fsblk_t inode_table;
ce421581 1888 int flexbg_flag = 0;
fd2d4291 1889 ext4_group_t i;
ac27a0ec 1890
ce421581
JS		 1891 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1892 flexbg_flag = 1;
1893
af5bc92d 1894 ext4_debug("Checking group descriptors");
ac27a0ec 1895
197cd65a
AM		 1896 for (i = 0; i < sbi->s_groups_count; i++) {
1897 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1898
ce421581 1899 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1900 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1901 else
1902 last_block = first_block +
617ba13b 1903 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1904
8fadc143 1905 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1906 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1907 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1908 "Block bitmap for group %u not in group "
b31e1552 1909 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1910 return 0;
1911 }
8fadc143 1912 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1913 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1914 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1915 "Inode bitmap for group %u not in group "
b31e1552 1916 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1917 return 0;
1918 }
8fadc143 1919 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1920 if (inode_table < first_block ||
2b2d6d01 1921 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1922 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1923 "Inode table for group %u not in group "
b31e1552 1924 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1925 return 0;
1926 }
955ce5f5 1927 ext4_lock_group(sb, i);
717d50e4 1928 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1929 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1930 "Checksum for group %u failed (%u!=%u)",
1931 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1932 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1933 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1934 ext4_unlock_group(sb, i);
8a266467 1935 return 0;
7ee1ec4c 1936 }
717d50e4 1937 }
955ce5f5 1938 ext4_unlock_group(sb, i);
ce421581
JS		 1939 if (!flexbg_flag)
1940 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1941 }
1942
bd81d8ee 1943 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 1944 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1945 return 1;
1946}
1947
617ba13b 1948/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1949 * the superblock) which were deleted from all directories, but held open by
1950 * a process at the time of a crash. We walk the list and try to delete these
1951 * inodes at recovery time (only with a read-write filesystem).
1952 *
1953 * In order to keep the orphan inode chain consistent during traversal (in
1954 * case of crash during recovery), we link each inode into the superblock
1955 * orphan list_head and handle it the same way as an inode deletion during
1956 * normal operation (which journals the operations for us).
1957 *
1958 * We only do an iget() and an iput() on each inode, which is very safe if we
1959 * accidentally point at an in-use or already deleted inode. The worst that
1960 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1961 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1962 * e2fsck was run on this filesystem, and it must have already done the orphan
1963 * inode cleanup for us, so we can safely abort without any further action.
1964 */
2b2d6d01
TT		 1965static void ext4_orphan_cleanup(struct super_block *sb,
1966 struct ext4_super_block *es)
ac27a0ec
DK		 1967{
1968 unsigned int s_flags = sb->s_flags;
1969 int nr_orphans = 0, nr_truncates = 0;
1970#ifdef CONFIG_QUOTA
1971 int i;
1972#endif
1973 if (!es->s_last_orphan) {
1974 jbd_debug(4, "no orphan inodes to clean up\n");
1975 return;
1976 }
1977
a8f48a95 1978 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 1979 ext4_msg(sb, KERN_ERR, "write access "
1980 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 1981 return;
1982 }
1983
617ba13b 1984 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1985 if (es->s_last_orphan)
1986 jbd_debug(1, "Errors on filesystem, "
1987 "clearing orphan list.\n");
1988 es->s_last_orphan = 0;
1989 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1990 return;
1991 }
1992
1993 if (s_flags & MS_RDONLY) {
b31e1552 1994 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 1995 sb->s_flags &= ~MS_RDONLY;
1996 }
1997#ifdef CONFIG_QUOTA
1998 /* Needed for iput() to work correctly and not trash data */
1999 sb->s_flags |= MS_ACTIVE;
2000 /* Turn on quotas so that they are updated correctly */
2001 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2002 if (EXT4_SB(sb)->s_qf_names[i]) {
2003 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2004 if (ret < 0)
b31e1552
ES		 2005 ext4_msg(sb, KERN_ERR,
2006 "Cannot turn on journaled "
2007 "quota: error %d", ret);
ac27a0ec
DK		 2008 }
2009 }
2010#endif
2011
2012 while (es->s_last_orphan) {
2013 struct inode *inode;
2014
97bd42b9
JB		 2015 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2016 if (IS_ERR(inode)) {
ac27a0ec
DK		 2017 es->s_last_orphan = 0;
2018 break;
2019 }
2020
617ba13b 2021 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2022 dquot_initialize(inode);
ac27a0ec 2023 if (inode->i_nlink) {
b31e1552
ES		 2024 ext4_msg(sb, KERN_DEBUG,
2025 "%s: truncating inode %lu to %lld bytes",
46e665e9 2026 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2027 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2028 inode->i_ino, inode->i_size);
617ba13b 2029 ext4_truncate(inode);
ac27a0ec
DK		 2030 nr_truncates++;
2031 } else {
b31e1552
ES		 2032 ext4_msg(sb, KERN_DEBUG,
2033 "%s: deleting unreferenced inode %lu",
46e665e9 2034 __func__, inode->i_ino);
ac27a0ec
DK		 2035 jbd_debug(2, "deleting unreferenced inode %lu\n",
2036 inode->i_ino);
2037 nr_orphans++;
2038 }
2039 iput(inode); /* The delete magic happens here! */
2040 }
2041
2b2d6d01 2042#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2043
2044 if (nr_orphans)
b31e1552
ES		 2045 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2046 PLURAL(nr_orphans));
ac27a0ec 2047 if (nr_truncates)
b31e1552
ES		 2048 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2049 PLURAL(nr_truncates));
ac27a0ec
DK		 2050#ifdef CONFIG_QUOTA
2051 /* Turn quotas off */
2052 for (i = 0; i < MAXQUOTAS; i++) {
2053 if (sb_dqopt(sb)->files[i])
6f28e087 2054 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 2055 }
2056#endif
2057 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2058}
0b8e58a1 2059
cd2291a4
ES		 2060/*
2061 * Maximal extent format file size.
2062 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2063 * extent format containers, within a sector_t, and within i_blocks
2064 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2065 * so that won't be a limiting factor.
2066 *
2067 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2068 */
f287a1a5 2069static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2070{
2071 loff_t res;
2072 loff_t upper_limit = MAX_LFS_FILESIZE;
2073
2074 /* small i_blocks in vfs inode? */
f287a1a5 2075 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2076 /*
90c699a9 2077 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2078 * i_block represent total blocks in 512 bytes
2079 * 32 == size of vfs inode i_blocks * 8
2080 */
2081 upper_limit = (1LL << 32) - 1;
2082
2083 /* total blocks in file system block size */
2084 upper_limit >>= (blkbits - 9);
2085 upper_limit <<= blkbits;
2086 }
2087
2088 /* 32-bit extent-start container, ee_block */
2089 res = 1LL << 32;
2090 res <<= blkbits;
2091 res -= 1;
2092
2093 /* Sanity check against vm- & vfs- imposed limits */
2094 if (res > upper_limit)
2095 res = upper_limit;
2096
2097 return res;
2098}
ac27a0ec 2099
ac27a0ec 2100/*
cd2291a4 2101 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2102 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2103 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2104 */
f287a1a5 2105static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2106{
617ba13b 2107 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2108 int meta_blocks;
2109 loff_t upper_limit;
0b8e58a1
AD		 2110 /* This is calculated to be the largest file size for a dense, block
2111 * mapped file such that the file's total number of 512-byte sectors,
2112 * including data and all indirect blocks, does not exceed (2^48 - 1).
2113 *
2114 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2115 * number of 512-byte sectors of the file.
0fc1b451
AK		 2116 */
2117
f287a1a5 2118 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2119 /*
90c699a9 2120 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2121 * the inode i_block field represents total file blocks in
2122 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2123 */
2124 upper_limit = (1LL << 32) - 1;
2125
2126 /* total blocks in file system block size */
2127 upper_limit >>= (bits - 9);
2128
2129 } else {
8180a562
AK		 2130 /*
2131 * We use 48 bit ext4_inode i_blocks
2132 * With EXT4_HUGE_FILE_FL set the i_blocks
2133 * represent total number of blocks in
2134 * file system block size
2135 */
0fc1b451
AK		 2136 upper_limit = (1LL << 48) - 1;
2137
0fc1b451
AK		 2138 }
2139
2140 /* indirect blocks */
2141 meta_blocks = 1;
2142 /* double indirect blocks */
2143 meta_blocks += 1 + (1LL << (bits-2));
2144 /* tripple indirect blocks */
2145 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2146
2147 upper_limit -= meta_blocks;
2148 upper_limit <<= bits;
ac27a0ec
DK		 2149
2150 res += 1LL << (bits-2);
2151 res += 1LL << (2*(bits-2));
2152 res += 1LL << (3*(bits-2));
2153 res <<= bits;
2154 if (res > upper_limit)
2155 res = upper_limit;
0fc1b451
AK		 2156
2157 if (res > MAX_LFS_FILESIZE)
2158 res = MAX_LFS_FILESIZE;
2159
ac27a0ec
DK		 2160 return res;
2161}
2162
617ba13b 2163static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2164 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2165{
617ba13b 2166 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2167 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2168 int has_super = 0;
2169
2170 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2171
617ba13b 2172 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2173 nr < first_meta_bg)
70bbb3e0 2174 return logical_sb_block + nr + 1;
ac27a0ec 2175 bg = sbi->s_desc_per_block * nr;
617ba13b 2176 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2177 has_super = 1;
0b8e58a1 2178
617ba13b 2179 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2180}
2181
c9de560d
AT		 2182/**
2183 * ext4_get_stripe_size: Get the stripe size.
2184 * @sbi: In memory super block info
2185 *
2186 * If we have specified it via mount option, then
2187 * use the mount option value. If the value specified at mount time is
2188 * greater than the blocks per group use the super block value.
2189 * If the super block value is greater than blocks per group return 0.
2190 * Allocator needs it be less than blocks per group.
2191 *
2192 */
2193static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2194{
2195 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2196 unsigned long stripe_width =
2197 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2198
2199 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2200 return sbi->s_stripe;
2201
2202 if (stripe_width <= sbi->s_blocks_per_group)
2203 return stripe_width;
2204
2205 if (stride <= sbi->s_blocks_per_group)
2206 return stride;
2207
2208 return 0;
2209}
ac27a0ec 2210
3197ebdb
TT		 2211/* sysfs supprt */
2212
2213struct ext4_attr {
2214 struct attribute attr;
2215 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2216 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2217 const char *, size_t);
2218 int offset;
2219};
2220
2221static int parse_strtoul(const char *buf,
2222 unsigned long max, unsigned long *value)
2223{
2224 char *endp;
2225
e7d2860b
AGR		 2226 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2227 endp = skip_spaces(endp);
3197ebdb
TT		 2228 if (*endp || *value > max)
2229 return -EINVAL;
2230
2231 return 0;
2232}
2233
2234static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2235 struct ext4_sb_info *sbi,
2236 char *buf)
2237{
2238 return snprintf(buf, PAGE_SIZE, "%llu\n",
2239 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2240}
2241
2242static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2243 struct ext4_sb_info *sbi, char *buf)
2244{
2245 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2246
2247 return snprintf(buf, PAGE_SIZE, "%lu\n",
2248 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2249 sbi->s_sectors_written_start) >> 1);
2250}
2251
2252static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2253 struct ext4_sb_info *sbi, char *buf)
2254{
2255 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2256
2257 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2258 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2259 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2260 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2261}
2262
2263static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2264 struct ext4_sb_info *sbi,
2265 const char *buf, size_t count)
2266{
2267 unsigned long t;
2268
2269 if (parse_strtoul(buf, 0x40000000, &t))
2270 return -EINVAL;
2271
f7c43950 2272 if (!is_power_of_2(t))
3197ebdb
TT		 2273 return -EINVAL;
2274
2275 sbi->s_inode_readahead_blks = t;
2276 return count;
2277}
2278
2279static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2280 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2281{
2282 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2283
2284 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2285}
2286
2287static ssize_t sbi_ui_store(struct ext4_attr *a,
2288 struct ext4_sb_info *sbi,
2289 const char *buf, size_t count)
2290{
2291 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2292 unsigned long t;
2293
2294 if (parse_strtoul(buf, 0xffffffff, &t))
2295 return -EINVAL;
2296 *ui = t;
2297 return count;
2298}
2299
2300#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2301static struct ext4_attr ext4_attr_##_name = { \
2302 .attr = {.name = __stringify(_name), .mode = _mode }, \
2303 .show = _show, \
2304 .store = _store, \
2305 .offset = offsetof(struct ext4_sb_info, _elname), \
2306}
2307#define EXT4_ATTR(name, mode, show, store) \
2308static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2309
2310#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2311#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2312#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2313 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2314#define ATTR_LIST(name) &ext4_attr_##name.attr
2315
2316EXT4_RO_ATTR(delayed_allocation_blocks);
2317EXT4_RO_ATTR(session_write_kbytes);
2318EXT4_RO_ATTR(lifetime_write_kbytes);
2319EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2320 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2321EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2322EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2323EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2324EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2325EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2326EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2327EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2328EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2329
2330static struct attribute *ext4_attrs[] = {
2331 ATTR_LIST(delayed_allocation_blocks),
2332 ATTR_LIST(session_write_kbytes),
2333 ATTR_LIST(lifetime_write_kbytes),
2334 ATTR_LIST(inode_readahead_blks),
11013911 2335 ATTR_LIST(inode_goal),
3197ebdb
TT		 2336 ATTR_LIST(mb_stats),
2337 ATTR_LIST(mb_max_to_scan),
2338 ATTR_LIST(mb_min_to_scan),
2339 ATTR_LIST(mb_order2_req),
2340 ATTR_LIST(mb_stream_req),
2341 ATTR_LIST(mb_group_prealloc),
55138e0b 2342 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2343 NULL,
2344};
2345
2346static ssize_t ext4_attr_show(struct kobject *kobj,
2347 struct attribute *attr, char *buf)
2348{
2349 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2350 s_kobj);
2351 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2352
2353 return a->show ? a->show(a, sbi, buf) : 0;
2354}
2355
2356static ssize_t ext4_attr_store(struct kobject *kobj,
2357 struct attribute *attr,
2358 const char *buf, size_t len)
2359{
2360 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2361 s_kobj);
2362 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2363
2364 return a->store ? a->store(a, sbi, buf, len) : 0;
2365}
2366
2367static void ext4_sb_release(struct kobject *kobj)
2368{
2369 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2370 s_kobj);
2371 complete(&sbi->s_kobj_unregister);
2372}
2373
2374
52cf25d0 2375static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2376 .show = ext4_attr_show,
2377 .store = ext4_attr_store,
2378};
2379
2380static struct kobj_type ext4_ktype = {
2381 .default_attrs = ext4_attrs,
2382 .sysfs_ops = &ext4_attr_ops,
2383 .release = ext4_sb_release,
2384};
2385
a13fb1a4
ES		 2386/*
2387 * Check whether this filesystem can be mounted based on
2388 * the features present and the RDONLY/RDWR mount requested.
2389 * Returns 1 if this filesystem can be mounted as requested,
2390 * 0 if it cannot be.
2391 */
2392static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2393{
2394 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2395 ext4_msg(sb, KERN_ERR,
2396 "Couldn't mount because of "
2397 "unsupported optional features (%x)",
2398 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2399 ~EXT4_FEATURE_INCOMPAT_SUPP));
2400 return 0;
2401 }
2402
2403 if (readonly)
2404 return 1;
2405
2406 /* Check that feature set is OK for a read-write mount */
2407 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2408 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2409 "unsupported optional features (%x)",
2410 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2411 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2412 return 0;
2413 }
2414 /*
2415 * Large file size enabled file system can only be mounted
2416 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2417 */
2418 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2419 if (sizeof(blkcnt_t) < sizeof(u64)) {
2420 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2421 "cannot be mounted RDWR without "
2422 "CONFIG_LBDAF");
2423 return 0;
2424 }
2425 }
2426 return 1;
2427}
2428
2b2d6d01 2429static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2430 __releases(kernel_lock)
2431 __acquires(kernel_lock)
ac27a0ec 2432{
2b2d6d01 2433 struct buffer_head *bh;
617ba13b
MC		 2434 struct ext4_super_block *es = NULL;
2435 struct ext4_sb_info *sbi;
2436 ext4_fsblk_t block;
2437 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2438 ext4_fsblk_t logical_sb_block;
ac27a0ec 2439 unsigned long offset = 0;
ac27a0ec
DK		 2440 unsigned long journal_devnum = 0;
2441 unsigned long def_mount_opts;
2442 struct inode *root;
9f6200bb 2443 char *cp;
0390131b 2444 const char *descr;
1d1fe1ee 2445 int ret = -EINVAL;
ac27a0ec 2446 int blocksize;
4ec11028
TT		 2447 unsigned int db_count;
2448 unsigned int i;
f287a1a5 2449 int needs_recovery, has_huge_files;
bd81d8ee 2450 __u64 blocks_count;
833f4077 2451 int err;
b3881f74 2452 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2453
2454 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2455 if (!sbi)
2456 return -ENOMEM;
705895b6
PE		 2457
2458 sbi->s_blockgroup_lock =
2459 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2460 if (!sbi->s_blockgroup_lock) {
2461 kfree(sbi);
2462 return -ENOMEM;
2463 }
ac27a0ec
DK		 2464 sb->s_fs_info = sbi;
2465 sbi->s_mount_opt = 0;
617ba13b
MC		 2466 sbi->s_resuid = EXT4_DEF_RESUID;
2467 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2468 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2469 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2470 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2471 sectors[1]);
ac27a0ec
DK		 2472
2473 unlock_kernel();
2474
9f6200bb
TT		 2475 /* Cleanup superblock name */
2476 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2477 *cp = '!';
2478
617ba13b 2479 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2480 if (!blocksize) {
b31e1552 2481 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2482 goto out_fail;
2483 }
2484
2485 /*
617ba13b 2486 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2487 * block sizes. We need to calculate the offset from buffer start.
2488 */
617ba13b 2489 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2490 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2491 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2492 } else {
70bbb3e0 2493 logical_sb_block = sb_block;
ac27a0ec
DK		 2494 }
2495
70bbb3e0 2496 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 2497 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 2498 goto out_fail;
2499 }
2500 /*
2501 * Note: s_es must be initialized as soon as possible because
617ba13b 2502 * some ext4 macro-instructions depend on its value
ac27a0ec 2503 */
617ba13b 2504 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2505 sbi->s_es = es;
2506 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2507 if (sb->s_magic != EXT4_SUPER_MAGIC)
2508 goto cantfind_ext4;
afc32f7e 2509 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2510
2511 /* Set defaults before we parse the mount options */
2512 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2513 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2514 set_opt(sbi->s_mount_opt, DEBUG);
437ca0fd
DM		 2515 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
2516 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
2517 "2.6.38");
ac27a0ec 2518 set_opt(sbi->s_mount_opt, GRPID);
437ca0fd 2519 }
617ba13b 2520 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2521 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2522#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2523 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2524 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2525#endif
03010a33 2526#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2527 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2528 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2529#endif
617ba13b 2530 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
482a7425 2531 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
617ba13b 2532 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
482a7425 2533 set_opt(sbi->s_mount_opt, ORDERED_DATA);
617ba13b 2534 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
482a7425 2535 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
617ba13b
MC		 2536
2537 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2538 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2539 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2540 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2541 else
2542 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2543
2544 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2545 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2546 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2547 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2548 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2549
571640ca 2550 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2551
dd919b98
AK		 2552 /*
2553 * enable delayed allocation by default
2554 * Use -o nodelalloc to turn it off
2555 */
ba69f9ab
JK		 2556 if (!IS_EXT3_SB(sb))
2557 set_opt(sbi->s_mount_opt, DELALLOC);
dd919b98 2558
b3881f74
TT		 2559 if (!parse_options((char *) data, sb, &journal_devnum,
2560 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2561 goto failed_mount;
2562
2563 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 2564 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2565
617ba13b
MC		 2566 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2567 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2568 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2569 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 2570 ext4_msg(sb, KERN_WARNING,
2571 "feature flags set on rev 0 fs, "
2572 "running e2fsck is recommended");
469108ff 2573
ac27a0ec
DK		 2574 /*
2575 * Check feature flags regardless of the revision level, since we
2576 * previously didn't change the revision level when setting the flags,
2577 * so there is a chance incompat flags are set on a rev 0 filesystem.
2578 */
a13fb1a4 2579 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 2580 goto failed_mount;
a13fb1a4 2581
ac27a0ec
DK		 2582 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2583
617ba13b
MC		 2584 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2585 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 2586 ext4_msg(sb, KERN_ERR,
2587 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 2588 goto failed_mount;
2589 }
2590
ac27a0ec 2591 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2592 /* Validate the filesystem blocksize */
2593 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 2594 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 2595 blocksize);
ac27a0ec
DK		 2596 goto failed_mount;
2597 }
2598
2b2d6d01 2599 brelse(bh);
70bbb3e0
AM		 2600 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2601 offset = do_div(logical_sb_block, blocksize);
2602 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 2603 if (!bh) {
b31e1552
ES		 2604 ext4_msg(sb, KERN_ERR,
2605 "Can't read superblock on 2nd try");
ac27a0ec
DK		 2606 goto failed_mount;
2607 }
617ba13b 2608 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2609 sbi->s_es = es;
617ba13b 2610 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 2611 ext4_msg(sb, KERN_ERR,
2612 "Magic mismatch, very weird!");
ac27a0ec
DK		 2613 goto failed_mount;
2614 }
2615 }
2616
a13fb1a4
ES		 2617 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2618 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 2619 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2620 has_huge_files);
2621 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2622
617ba13b
MC		 2623 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2624 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2625 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2626 } else {
2627 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2628 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2629 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2630 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2631 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 2632 ext4_msg(sb, KERN_ERR,
2633 "unsupported inode size: %d",
2b2d6d01 2634 sbi->s_inode_size);
ac27a0ec
DK		 2635 goto failed_mount;
2636 }
ef7f3835
KS		 2637 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2638 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2639 }
0b8e58a1 2640
0d1ee42f
AR		 2641 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2642 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2643 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2644 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2645 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 2646 ext4_msg(sb, KERN_ERR,
2647 "unsupported descriptor size %lu",
0d1ee42f
AR		 2648 sbi->s_desc_size);
2649 goto failed_mount;
2650 }
2651 } else
2652 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 2653
ac27a0ec 2654 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2655 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2656 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 2657 goto cantfind_ext4;
0b8e58a1 2658
617ba13b 2659 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2660 if (sbi->s_inodes_per_block == 0)
617ba13b 2661 goto cantfind_ext4;
ac27a0ec
DK		 2662 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2663 sbi->s_inodes_per_block;
0d1ee42f 2664 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2665 sbi->s_sbh = bh;
2666 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2667 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2668 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 2669
2b2d6d01 2670 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2671 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2672 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2673 i = le32_to_cpu(es->s_flags);
2674 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2675 sbi->s_hash_unsigned = 3;
2676 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2677#ifdef __CHAR_UNSIGNED__
2678 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2679 sbi->s_hash_unsigned = 3;
2680#else
2681 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2682#endif
2683 sb->s_dirt = 1;
2684 }
ac27a0ec
DK		 2685
2686 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 2687 ext4_msg(sb, KERN_ERR,
2688 "#blocks per group too big: %lu",
2b2d6d01 2689 sbi->s_blocks_per_group);
ac27a0ec
DK		 2690 goto failed_mount;
2691 }
ac27a0ec 2692 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 2693 ext4_msg(sb, KERN_ERR,
2694 "#inodes per group too big: %lu",
2b2d6d01 2695 sbi->s_inodes_per_group);
ac27a0ec
DK		 2696 goto failed_mount;
2697 }
2698
bf43d84b
ES		 2699 /*
2700 * Test whether we have more sectors than will fit in sector_t,
2701 * and whether the max offset is addressable by the page cache.
2702 */
2703 if ((ext4_blocks_count(es) >
2704 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2705 (ext4_blocks_count(es) >
2706 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
b31e1552 2707 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 2708 " too large to mount safely on this system");
ac27a0ec 2709 if (sizeof(sector_t) < 8)
90c699a9 2710 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
bf43d84b 2711 ret = -EFBIG;
ac27a0ec
DK		 2712 goto failed_mount;
2713 }
2714
617ba13b
MC		 2715 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2716 goto cantfind_ext4;
e7c95593 2717
0f2ddca6
FTN		 2718 /* check blocks count against device size */
2719 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2720 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 2721 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2722 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 2723 ext4_blocks_count(es), blocks_count);
2724 goto failed_mount;
2725 }
2726
0b8e58a1
AD		 2727 /*
2728 * It makes no sense for the first data block to be beyond the end
2729 * of the filesystem.
2730 */
2731 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 2732 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2733 "block %u is beyond end of filesystem (%llu)",
2734 le32_to_cpu(es->s_first_data_block),
2735 ext4_blocks_count(es));
e7c95593
ES		 2736 goto failed_mount;
2737 }
bd81d8ee
LV		 2738 blocks_count = (ext4_blocks_count(es) -
2739 le32_to_cpu(es->s_first_data_block) +
2740 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2741 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 2742 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 2743 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 2744 "(block count %llu, first data block %u, "
b31e1552 2745 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 2746 ext4_blocks_count(es),
2747 le32_to_cpu(es->s_first_data_block),
2748 EXT4_BLOCKS_PER_GROUP(sb));
2749 goto failed_mount;
2750 }
bd81d8ee 2751 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 2752 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2753 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 2754 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2755 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2756 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2757 GFP_KERNEL);
2758 if (sbi->s_group_desc == NULL) {
b31e1552 2759 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 2760 goto failed_mount;
2761 }
2762
3244fcb1 2763#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2764 if (ext4_proc_root)
2765 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2766#endif
240799cd 2767
705895b6 2768 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2769
2770 for (i = 0; i < db_count; i++) {
70bbb3e0 2771 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2772 sbi->s_group_desc[i] = sb_bread(sb, block);
2773 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 2774 ext4_msg(sb, KERN_ERR,
2775 "can't read group descriptor %d", i);
ac27a0ec
DK		 2776 db_count = i;
2777 goto failed_mount2;
2778 }
2779 }
2b2d6d01 2780 if (!ext4_check_descriptors(sb)) {
b31e1552 2781 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 2782 goto failed_mount2;
2783 }
772cb7c8
JS		 2784 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2785 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 2786 ext4_msg(sb, KERN_ERR,
2787 "unable to initialize "
2788 "flex_bg meta info!");
772cb7c8
JS		 2789 goto failed_mount2;
2790 }
2791
ac27a0ec
DK		 2792 sbi->s_gdb_count = db_count;
2793 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2794 spin_lock_init(&sbi->s_next_gen_lock);
2795
833f4077
PZ		 2796 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2797 ext4_count_free_blocks(sb));
2798 if (!err) {
2799 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2800 ext4_count_free_inodes(sb));
2801 }
2802 if (!err) {
2803 err = percpu_counter_init(&sbi->s_dirs_counter,
2804 ext4_count_dirs(sb));
2805 }
6bc6e63f
AK		 2806 if (!err) {
2807 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2808 }
833f4077 2809 if (err) {
b31e1552 2810 ext4_msg(sb, KERN_ERR, "insufficient memory");
833f4077
PZ		 2811 goto failed_mount3;
2812 }
ac27a0ec 2813
c9de560d 2814 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 2815 sbi->s_max_writeback_mb_bump = 128;
c9de560d 2816
ac27a0ec
DK		 2817 /*
2818 * set up enough so that it can read an inode
2819 */
9ca92389
TT		 2820 if (!test_opt(sb, NOLOAD) &&
2821 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2822 sb->s_op = &ext4_sops;
2823 else
2824 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2825 sb->s_export_op = &ext4_export_ops;
2826 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2827#ifdef CONFIG_QUOTA
617ba13b
MC		 2828 sb->s_qcop = &ext4_qctl_operations;
2829 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2830#endif
2831 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2832 mutex_init(&sbi->s_orphan_lock);
32ed5058 2833 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2834
2835 sb->s_root = NULL;
2836
2837 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2838 EXT4_HAS_INCOMPAT_FEATURE(sb,
2839 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2840
2841 /*
2842 * The first inode we look at is the journal inode. Don't try
2843 * root first: it may be modified in the journal!
2844 */
2845 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2846 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2847 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2848 goto failed_mount3;
0390131b
FM		 2849 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2850 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 2851 ext4_msg(sb, KERN_ERR, "required journal recovery "
2852 "suppressed and not mounted read-only");
744692dc 2853 goto failed_mount_wq;
ac27a0ec 2854 } else {
0390131b
FM		 2855 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2856 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2857 sbi->s_journal = NULL;
2858 needs_recovery = 0;
2859 goto no_journal;
ac27a0ec
DK		 2860 }
2861
eb40a09c
JS		 2862 if (ext4_blocks_count(es) > 0xffffffffULL &&
2863 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2864 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 2865 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 2866 goto failed_mount_wq;
eb40a09c
JS		 2867 }
2868
d4da6c9c
LT		 2869 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2870 jbd2_journal_set_features(sbi->s_journal,
2871 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 2872 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2873 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2874 jbd2_journal_set_features(sbi->s_journal,
2875 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 2876 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2877 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2878 } else {
2879 jbd2_journal_clear_features(sbi->s_journal,
2880 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2881 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2882 }
818d276c 2883
ac27a0ec
DK		 2884 /* We have now updated the journal if required, so we can
2885 * validate the data journaling mode. */
2886 switch (test_opt(sb, DATA_FLAGS)) {
2887 case 0:
2888 /* No mode set, assume a default based on the journal
63f57933
AM		 2889 * capabilities: ORDERED_DATA if the journal can
2890 * cope, else JOURNAL_DATA
2891 */
dab291af
MC		 2892 if (jbd2_journal_check_available_features
2893 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2894 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2895 else
2896 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2897 break;
2898
617ba13b
MC		 2899 case EXT4_MOUNT_ORDERED_DATA:
2900 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2901 if (!jbd2_journal_check_available_features
2902 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 2903 ext4_msg(sb, KERN_ERR, "Journal does not support "
2904 "requested data journaling mode");
744692dc 2905 goto failed_mount_wq;
ac27a0ec
DK		 2906 }
2907 default:
2908 break;
2909 }
b3881f74 2910 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2911
0390131b 2912no_journal:
ac27a0ec 2913 if (test_opt(sb, NOBH)) {
617ba13b 2914 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
b31e1552
ES		 2915 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2916 "its supported only with writeback mode");
ac27a0ec
DK		 2917 clear_opt(sbi->s_mount_opt, NOBH);
2918 }
744692dc
JZ		 2919 if (test_opt(sb, DIOREAD_NOLOCK)) {
2920 ext4_msg(sb, KERN_WARNING, "dioread_nolock option is "
2921 "not supported with nobh mode");
2922 goto failed_mount_wq;
2923 }
ac27a0ec 2924 }
4c0425ff
MC		 2925 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2926 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2927 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2928 goto failed_mount_wq;
2929 }
2930
ac27a0ec 2931 /*
dab291af 2932 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2933 * so we can safely mount the rest of the filesystem now.
2934 */
2935
1d1fe1ee
DH		 2936 root = ext4_iget(sb, EXT4_ROOT_INO);
2937 if (IS_ERR(root)) {
b31e1552 2938 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 2939 ret = PTR_ERR(root);
ac27a0ec
DK		 2940 goto failed_mount4;
2941 }
2942 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2943 iput(root);
b31e1552 2944 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 2945 goto failed_mount4;
2946 }
1d1fe1ee
DH		 2947 sb->s_root = d_alloc_root(root);
2948 if (!sb->s_root) {
b31e1552 2949 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 2950 iput(root);
2951 ret = -ENOMEM;
2952 goto failed_mount4;
2953 }
ac27a0ec 2954
2b2d6d01 2955 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2956
2957 /* determine the minimum size of new large inodes, if present */
2958 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2959 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2960 EXT4_GOOD_OLD_INODE_SIZE;
2961 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2962 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2963 if (sbi->s_want_extra_isize <
2964 le16_to_cpu(es->s_want_extra_isize))
2965 sbi->s_want_extra_isize =
2966 le16_to_cpu(es->s_want_extra_isize);
2967 if (sbi->s_want_extra_isize <
2968 le16_to_cpu(es->s_min_extra_isize))
2969 sbi->s_want_extra_isize =
2970 le16_to_cpu(es->s_min_extra_isize);
2971 }
2972 }
2973 /* Check if enough inode space is available */
2974 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2975 sbi->s_inode_size) {
2976 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2977 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 2978 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2979 "available");
ef7f3835
KS		 2980 }
2981
90576c0b
TT		 2982 if (test_opt(sb, DELALLOC) &&
2983 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 2984 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2985 "requested data journaling mode");
c2774d84 2986 clear_opt(sbi->s_mount_opt, DELALLOC);
90576c0b 2987 }
744692dc
JZ		 2988 if (test_opt(sb, DIOREAD_NOLOCK)) {
2989 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2990 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
2991 "option - requested data journaling mode");
2992 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
2993 }
2994 if (sb->s_blocksize < PAGE_SIZE) {
2995 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
2996 "option - block size is too small");
2997 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
2998 }
2999 }
c2774d84 3000
6fd058f7
TT		 3001 err = ext4_setup_system_zone(sb);
3002 if (err) {
b31e1552
ES		 3003 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3004 "zone (%d)\n", err);
6fd058f7
TT		 3005 goto failed_mount4;
3006 }
3007
c2774d84
AK		 3008 ext4_ext_init(sb);
3009 err = ext4_mb_init(sb, needs_recovery);
3010 if (err) {
b31e1552
ES		 3011 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
3012 err);
c2774d84
AK		 3013 goto failed_mount4;
3014 }
3015
3197ebdb
TT		 3016 sbi->s_kobj.kset = ext4_kset;
3017 init_completion(&sbi->s_kobj_unregister);
3018 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3019 "%s", sb->s_id);
3020 if (err) {
3021 ext4_mb_release(sb);
3022 ext4_ext_release(sb);
3023 goto failed_mount4;
3024 };
3025
617ba13b
MC		 3026 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3027 ext4_orphan_cleanup(sb, es);
3028 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3029 if (needs_recovery) {
b31e1552 3030 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3031 ext4_mark_recovery_complete(sb, es);
3032 }
3033 if (EXT4_SB(sb)->s_journal) {
3034 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3035 descr = " journalled data mode";
3036 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3037 descr = " ordered data mode";
3038 else
3039 descr = " writeback data mode";
3040 } else
3041 descr = "out journal";
3042
b31e1552 3043 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
ac27a0ec
DK		 3044
3045 lock_kernel();
3046 return 0;
3047
617ba13b 3048cantfind_ext4:
ac27a0ec 3049 if (!silent)
b31e1552 3050 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3051 goto failed_mount;
3052
3053failed_mount4:
b31e1552 3054 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3055 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3056failed_mount_wq:
6fd058f7 3057 ext4_release_system_zone(sb);
0390131b
FM		 3058 if (sbi->s_journal) {
3059 jbd2_journal_destroy(sbi->s_journal);
3060 sbi->s_journal = NULL;
3061 }
ac27a0ec 3062failed_mount3:
c5ca7c76
TT		 3063 if (sbi->s_flex_groups) {
3064 if (is_vmalloc_addr(sbi->s_flex_groups))
3065 vfree(sbi->s_flex_groups);
3066 else
3067 kfree(sbi->s_flex_groups);
3068 }
ac27a0ec
DK		 3069 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3070 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3071 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 3072 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 3073failed_mount2:
3074 for (i = 0; i < db_count; i++)
3075 brelse(sbi->s_group_desc[i]);
3076 kfree(sbi->s_group_desc);
3077failed_mount:
240799cd 3078 if (sbi->s_proc) {
9f6200bb 3079 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3080 }
ac27a0ec
DK		 3081#ifdef CONFIG_QUOTA
3082 for (i = 0; i < MAXQUOTAS; i++)
3083 kfree(sbi->s_qf_names[i]);
3084#endif
617ba13b 3085 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3086 brelse(bh);
3087out_fail:
3088 sb->s_fs_info = NULL;
f6830165 3089 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3090 kfree(sbi);
3091 lock_kernel();
1d1fe1ee 3092 return ret;
ac27a0ec
DK		 3093}
3094
3095/*
3096 * Setup any per-fs journal parameters now. We'll do this both on
3097 * initial mount, once the journal has been initialised but before we've
3098 * done any recovery; and again on any subsequent remount.
3099 */
617ba13b 3100static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3101{
617ba13b 3102 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3103
30773840
TT		 3104 journal->j_commit_interval = sbi->s_commit_interval;
3105 journal->j_min_batch_time = sbi->s_min_batch_time;
3106 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3107
3108 spin_lock(&journal->j_state_lock);
3109 if (test_opt(sb, BARRIER))
dab291af 3110 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3111 else
dab291af 3112 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3113 if (test_opt(sb, DATA_ERR_ABORT))
3114 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3115 else
3116 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 3117 spin_unlock(&journal->j_state_lock);
3118}
3119
617ba13b 3120static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3121 unsigned int journal_inum)
3122{
3123 struct inode *journal_inode;
3124 journal_t *journal;
3125
0390131b
FM		 3126 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3127
ac27a0ec
DK		 3128 /* First, test for the existence of a valid inode on disk. Bad
3129 * things happen if we iget() an unused inode, as the subsequent
3130 * iput() will try to delete it. */
3131
1d1fe1ee
DH		 3132 journal_inode = ext4_iget(sb, journal_inum);
3133 if (IS_ERR(journal_inode)) {
b31e1552 3134 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3135 return NULL;
3136 }
3137 if (!journal_inode->i_nlink) {
3138 make_bad_inode(journal_inode);
3139 iput(journal_inode);
b31e1552 3140 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3141 return NULL;
3142 }
3143
e5f8eab8 3144 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3145 journal_inode, journal_inode->i_size);
1d1fe1ee 3146 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3147 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3148 iput(journal_inode);
3149 return NULL;
3150 }
3151
dab291af 3152 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3153 if (!journal) {
b31e1552 3154 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3155 iput(journal_inode);
3156 return NULL;
3157 }
3158 journal->j_private = sb;
617ba13b 3159 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3160 return journal;
3161}
3162
617ba13b 3163static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3164 dev_t j_dev)
3165{
2b2d6d01 3166 struct buffer_head *bh;
ac27a0ec 3167 journal_t *journal;
617ba13b
MC		 3168 ext4_fsblk_t start;
3169 ext4_fsblk_t len;
ac27a0ec 3170 int hblock, blocksize;
617ba13b 3171 ext4_fsblk_t sb_block;
ac27a0ec 3172 unsigned long offset;
2b2d6d01 3173 struct ext4_super_block *es;
ac27a0ec
DK		 3174 struct block_device *bdev;
3175
0390131b
FM		 3176 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3177
b31e1552 3178 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3179 if (bdev == NULL)
3180 return NULL;
3181
3182 if (bd_claim(bdev, sb)) {
b31e1552
ES		 3183 ext4_msg(sb, KERN_ERR,
3184 "failed to claim external journal device");
9a1c3542 3185 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3186 return NULL;
3187 }
3188
3189 blocksize = sb->s_blocksize;
e1defc4f 3190 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3191 if (blocksize < hblock) {
b31e1552
ES		 3192 ext4_msg(sb, KERN_ERR,
3193 "blocksize too small for journal device");
ac27a0ec
DK		 3194 goto out_bdev;
3195 }
3196
617ba13b
MC		 3197 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3198 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3199 set_blocksize(bdev, blocksize);
3200 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3201 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3202 "external journal");
ac27a0ec
DK		 3203 goto out_bdev;
3204 }
3205
617ba13b
MC		 3206 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3207 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3208 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3209 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3210 ext4_msg(sb, KERN_ERR, "external journal has "
3211 "bad superblock");
ac27a0ec
DK		 3212 brelse(bh);
3213 goto out_bdev;
3214 }
3215
617ba13b 3216 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3217 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3218 brelse(bh);
3219 goto out_bdev;
3220 }
3221
bd81d8ee 3222 len = ext4_blocks_count(es);
ac27a0ec
DK		 3223 start = sb_block + 1;
3224 brelse(bh); /* we're done with the superblock */
3225
dab291af 3226 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3227 start, len, blocksize);
3228 if (!journal) {
b31e1552 3229 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3230 goto out_bdev;
3231 }
3232 journal->j_private = sb;
3233 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3234 wait_on_buffer(journal->j_sb_buffer);
3235 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3236 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3237 goto out_journal;
3238 }
3239 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3240 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3241 "user (unsupported) - %d",
ac27a0ec
DK		 3242 be32_to_cpu(journal->j_superblock->s_nr_users));
3243 goto out_journal;
3244 }
617ba13b
MC		 3245 EXT4_SB(sb)->journal_bdev = bdev;
3246 ext4_init_journal_params(sb, journal);
ac27a0ec 3247 return journal;
0b8e58a1 3248
ac27a0ec 3249out_journal:
dab291af 3250 jbd2_journal_destroy(journal);
ac27a0ec 3251out_bdev:
617ba13b 3252 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3253 return NULL;
3254}
3255
617ba13b
MC		 3256static int ext4_load_journal(struct super_block *sb,
3257 struct ext4_super_block *es,
ac27a0ec
DK		 3258 unsigned long journal_devnum)
3259{
3260 journal_t *journal;
3261 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3262 dev_t journal_dev;
3263 int err = 0;
3264 int really_read_only;
3265
0390131b
FM		 3266 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3267
ac27a0ec
DK		 3268 if (journal_devnum &&
3269 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3270 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3271 "numbers have changed");
ac27a0ec
DK		 3272 journal_dev = new_decode_dev(journal_devnum);
3273 } else
3274 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3275
3276 really_read_only = bdev_read_only(sb->s_bdev);
3277
3278 /*
3279 * Are we loading a blank journal or performing recovery after a
3280 * crash? For recovery, we need to check in advance whether we
3281 * can get read-write access to the device.
3282 */
617ba13b 3283 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3284 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3285 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3286 "required on readonly filesystem");
ac27a0ec 3287 if (really_read_only) {
b31e1552
ES		 3288 ext4_msg(sb, KERN_ERR, "write access "
3289 "unavailable, cannot proceed");
ac27a0ec
DK		 3290 return -EROFS;
3291 }
b31e1552
ES		 3292 ext4_msg(sb, KERN_INFO, "write access will "
3293 "be enabled during recovery");
ac27a0ec
DK		 3294 }
3295 }
3296
3297 if (journal_inum && journal_dev) {
b31e1552
ES		 3298 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3299 "and inode journals!");
ac27a0ec
DK		 3300 return -EINVAL;
3301 }
3302
3303 if (journal_inum) {
617ba13b 3304 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3305 return -EINVAL;
3306 } else {
617ba13b 3307 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3308 return -EINVAL;
3309 }
3310
90576c0b 3311 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3312 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3313
ac27a0ec 3314 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3315 err = jbd2_journal_update_format(journal);
ac27a0ec 3316 if (err) {
b31e1552 3317 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3318 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3319 return err;
3320 }
3321 }
3322
617ba13b 3323 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3324 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3325 if (!err)
dab291af 3326 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3327
3328 if (err) {
b31e1552 3329 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3330 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3331 return err;
3332 }
3333
617ba13b
MC		 3334 EXT4_SB(sb)->s_journal = journal;
3335 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3336
3337 if (journal_devnum &&
3338 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3339 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3340
3341 /* Make sure we flush the recovery flag to disk. */
e2d67052 3342 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3343 }
3344
3345 return 0;
3346}
3347
e2d67052 3348static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3349{
e2d67052 3350 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3351 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3352 int error = 0;
ac27a0ec
DK		 3353
3354 if (!sbh)
c4be0c1d 3355 return error;
914258bf
TT		 3356 if (buffer_write_io_error(sbh)) {
3357 /*
3358 * Oh, dear. A previous attempt to write the
3359 * superblock failed. This could happen because the
3360 * USB device was yanked out. Or it could happen to
3361 * be a transient write error and maybe the block will
3362 * be remapped. Nothing we can do but to retry the
3363 * write and hope for the best.
3364 */
b31e1552
ES		 3365 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3366 "superblock detected");
914258bf
TT		 3367 clear_buffer_write_io_error(sbh);
3368 set_buffer_uptodate(sbh);
3369 }
71290b36
TT		 3370 /*
3371 * If the file system is mounted read-only, don't update the
3372 * superblock write time. This avoids updating the superblock
3373 * write time when we are mounting the root file system
3374 * read/only but we need to replay the journal; at that point,
3375 * for people who are east of GMT and who make their clock
3376 * tick in localtime for Windows bug-for-bug compatibility,
3377 * the clock is set in the future, and this will cause e2fsck
3378 * to complain and force a full file system check.
3379 */
3380 if (!(sb->s_flags & MS_RDONLY))
3381 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3382 es->s_kbytes_written =
3383 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3384 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3385 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3386 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3387 &EXT4_SB(sb)->s_freeblocks_counter));
3388 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3389 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3390 sb->s_dirt = 0;
ac27a0ec
DK		 3391 BUFFER_TRACE(sbh, "marking dirty");
3392 mark_buffer_dirty(sbh);
914258bf 3393 if (sync) {
c4be0c1d
TS		 3394 error = sync_dirty_buffer(sbh);
3395 if (error)
3396 return error;
3397
3398 error = buffer_write_io_error(sbh);
3399 if (error) {
b31e1552
ES		 3400 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3401 "superblock");
914258bf
TT		 3402 clear_buffer_write_io_error(sbh);
3403 set_buffer_uptodate(sbh);
3404 }
3405 }
c4be0c1d 3406 return error;
ac27a0ec
DK		 3407}
3408
ac27a0ec
DK		 3409/*
3410 * Have we just finished recovery? If so, and if we are mounting (or
3411 * remounting) the filesystem readonly, then we will end up with a
3412 * consistent fs on disk. Record that fact.
3413 */
2b2d6d01
TT		 3414static void ext4_mark_recovery_complete(struct super_block *sb,
3415 struct ext4_super_block *es)
ac27a0ec 3416{
617ba13b 3417 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3418
0390131b
FM		 3419 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3420 BUG_ON(journal != NULL);
3421 return;
3422 }
dab291af 3423 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3424 if (jbd2_journal_flush(journal) < 0)
3425 goto out;
3426
617ba13b 3427 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3428 sb->s_flags & MS_RDONLY) {
617ba13b 3429 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3430 ext4_commit_super(sb, 1);
ac27a0ec 3431 }
7ffe1ea8
HK		 3432
3433out:
dab291af 3434 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3435}
3436
3437/*
3438 * If we are mounting (or read-write remounting) a filesystem whose journal
3439 * has recorded an error from a previous lifetime, move that error to the
3440 * main filesystem now.
3441 */
2b2d6d01
TT		 3442static void ext4_clear_journal_err(struct super_block *sb,
3443 struct ext4_super_block *es)
ac27a0ec
DK		 3444{
3445 journal_t *journal;
3446 int j_errno;
3447 const char *errstr;
3448
0390131b
FM		 3449 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3450
617ba13b 3451 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3452
3453 /*
3454 * Now check for any error status which may have been recorded in the
617ba13b 3455 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3456 */
3457
dab291af 3458 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3459 if (j_errno) {
3460 char nbuf[16];
3461
617ba13b 3462 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 3463 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 3464 "from previous mount: %s", errstr);
12062ddd 3465 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 3466
617ba13b
MC		 3467 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3468 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3469 ext4_commit_super(sb, 1);
ac27a0ec 3470
dab291af 3471 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3472 }
3473}
3474
3475/*
3476 * Force the running and committing transactions to commit,
3477 * and wait on the commit.
3478 */
617ba13b 3479int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3480{
3481 journal_t *journal;
0390131b 3482 int ret = 0;
ac27a0ec
DK		 3483
3484 if (sb->s_flags & MS_RDONLY)
3485 return 0;
3486
617ba13b 3487 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3488 if (journal)
0390131b 3489 ret = ext4_journal_force_commit(journal);
0390131b 3490
ac27a0ec
DK		 3491 return ret;
3492}
3493
2b2d6d01 3494static void ext4_write_super(struct super_block *sb)
ac27a0ec 3495{
ebc1ac16 3496 lock_super(sb);
9ca92389 3497 ext4_commit_super(sb, 1);
ebc1ac16 3498 unlock_super(sb);
ac27a0ec
DK		 3499}
3500
617ba13b 3501static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3502{
14ce0cb4 3503 int ret = 0;
9eddacf9 3504 tid_t target;
8d5d02e6 3505 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3506
9bffad1e 3507 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 3508 flush_workqueue(sbi->dio_unwritten_wq);
3509 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 3510 if (wait)
8d5d02e6 3511 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 3512 }
14ce0cb4 3513 return ret;
ac27a0ec
DK		 3514}
3515
3516/*
3517 * LVM calls this function before a (read-only) snapshot is created. This
3518 * gives us a chance to flush the journal completely and mark the fs clean.
3519 */
c4be0c1d 3520static int ext4_freeze(struct super_block *sb)
ac27a0ec 3521{
c4be0c1d
TS		 3522 int error = 0;
3523 journal_t *journal;
ac27a0ec 3524
9ca92389
TT		 3525 if (sb->s_flags & MS_RDONLY)
3526 return 0;
ac27a0ec 3527
9ca92389 3528 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3529
9ca92389
TT		 3530 /* Now we set up the journal barrier. */
3531 jbd2_journal_lock_updates(journal);
ac27a0ec 3532
9ca92389
TT		 3533 /*
3534 * Don't clear the needs_recovery flag if we failed to flush
3535 * the journal.
3536 */
3537 error = jbd2_journal_flush(journal);
3538 if (error < 0) {
3539 out:
3540 jbd2_journal_unlock_updates(journal);
3541 return error;
ac27a0ec 3542 }
9ca92389
TT		 3543
3544 /* Journal blocked and flushed, clear needs_recovery flag. */
3545 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3546 error = ext4_commit_super(sb, 1);
3547 if (error)
3548 goto out;
c4be0c1d 3549 return 0;
ac27a0ec
DK		 3550}
3551
3552/*
3553 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3554 * flag here, even though the filesystem is not technically dirty yet.
3555 */
c4be0c1d 3556static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3557{
9ca92389
TT		 3558 if (sb->s_flags & MS_RDONLY)
3559 return 0;
3560
3561 lock_super(sb);
3562 /* Reset the needs_recovery flag before the fs is unlocked. */
3563 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3564 ext4_commit_super(sb, 1);
3565 unlock_super(sb);
3566 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3567 return 0;
ac27a0ec
DK		 3568}
3569
2b2d6d01 3570static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3571{
2b2d6d01 3572 struct ext4_super_block *es;
617ba13b
MC		 3573 struct ext4_sb_info *sbi = EXT4_SB(sb);
3574 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3575 unsigned long old_sb_flags;
617ba13b 3576 struct ext4_mount_options old_opts;
8a266467 3577 ext4_group_t g;
b3881f74 3578 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3579 int err;
3580#ifdef CONFIG_QUOTA
3581 int i;
3582#endif
3583
337eb00a
AIB		 3584 lock_kernel();
3585
ac27a0ec 3586 /* Store the original options */
bbd6851a 3587 lock_super(sb);
ac27a0ec
DK		 3588 old_sb_flags = sb->s_flags;
3589 old_opts.s_mount_opt = sbi->s_mount_opt;
3590 old_opts.s_resuid = sbi->s_resuid;
3591 old_opts.s_resgid = sbi->s_resgid;
3592 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3593 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3594 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3595#ifdef CONFIG_QUOTA
3596 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3597 for (i = 0; i < MAXQUOTAS; i++)
3598 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3599#endif
b3881f74
TT		 3600 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3601 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3602
3603 /*
3604 * Allow the "check" option to be passed as a remount option.
3605 */
b3881f74
TT		 3606 if (!parse_options(data, sb, NULL, &journal_ioprio,
3607 &n_blocks_count, 1)) {
ac27a0ec
DK		 3608 err = -EINVAL;
3609 goto restore_opts;
3610 }
3611
4ab2f15b 3612 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
46e665e9 3613 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3614
3615 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3616 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3617
3618 es = sbi->s_es;
3619
b3881f74 3620 if (sbi->s_journal) {
0390131b 3621 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3622 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3623 }
ac27a0ec
DK		 3624
3625 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3626 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 3627 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 3628 err = -EROFS;
3629 goto restore_opts;
3630 }
3631
3632 if (*flags & MS_RDONLY) {
3633 /*
3634 * First of all, the unconditional stuff we have to do
3635 * to disable replay of the journal when we next remount
3636 */
3637 sb->s_flags |= MS_RDONLY;
3638
3639 /*
3640 * OK, test if we are remounting a valid rw partition
3641 * readonly, and if so set the rdonly flag and then
3642 * mark the partition as valid again.
3643 */
617ba13b
MC		 3644 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3645 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3646 es->s_state = cpu_to_le16(sbi->s_mount_state);
3647
a63c9eb2 3648 if (sbi->s_journal)
0390131b 3649 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3650 } else {
a13fb1a4
ES		 3651 /* Make sure we can mount this feature set readwrite */
3652 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 3653 err = -EROFS;
3654 goto restore_opts;
3655 }
8a266467
TT		 3656 /*
3657 * Make sure the group descriptor checksums
0b8e58a1 3658 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 3659 */
3660 for (g = 0; g < sbi->s_groups_count; g++) {
3661 struct ext4_group_desc *gdp =
3662 ext4_get_group_desc(sb, g, NULL);
3663
3664 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 3665 ext4_msg(sb, KERN_ERR,
3666 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 3667 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3668 le16_to_cpu(gdp->bg_checksum));
3669 err = -EINVAL;
3670 goto restore_opts;
3671 }
3672 }
3673
ead6596b
ES		 3674 /*
3675 * If we have an unprocessed orphan list hanging
3676 * around from a previously readonly bdev mount,
3677 * require a full umount/remount for now.
3678 */
3679 if (es->s_last_orphan) {
b31e1552 3680 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 3681 "remount RDWR because of unprocessed "
3682 "orphan inode list. Please "
b31e1552 3683 "umount/remount instead");
ead6596b
ES		 3684 err = -EINVAL;
3685 goto restore_opts;
3686 }
3687
ac27a0ec
DK		 3688 /*
3689 * Mounting a RDONLY partition read-write, so reread
3690 * and store the current valid flag. (It may have
3691 * been changed by e2fsck since we originally mounted
3692 * the partition.)
3693 */
0390131b
FM		 3694 if (sbi->s_journal)
3695 ext4_clear_journal_err(sb, es);
ac27a0ec 3696 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3697 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3698 goto restore_opts;
2b2d6d01 3699 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3700 sb->s_flags &= ~MS_RDONLY;
3701 }
3702 }
6fd058f7 3703 ext4_setup_system_zone(sb);
0390131b 3704 if (sbi->s_journal == NULL)
e2d67052 3705 ext4_commit_super(sb, 1);
0390131b 3706
ac27a0ec
DK		 3707#ifdef CONFIG_QUOTA
3708 /* Release old quota file names */
3709 for (i = 0; i < MAXQUOTAS; i++)
3710 if (old_opts.s_qf_names[i] &&
3711 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3712 kfree(old_opts.s_qf_names[i]);
3713#endif
bbd6851a 3714 unlock_super(sb);
337eb00a 3715 unlock_kernel();
ac27a0ec 3716 return 0;
0b8e58a1 3717
ac27a0ec
DK		 3718restore_opts:
3719 sb->s_flags = old_sb_flags;
3720 sbi->s_mount_opt = old_opts.s_mount_opt;
3721 sbi->s_resuid = old_opts.s_resuid;
3722 sbi->s_resgid = old_opts.s_resgid;
3723 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3724 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3725 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3726#ifdef CONFIG_QUOTA
3727 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3728 for (i = 0; i < MAXQUOTAS; i++) {
3729 if (sbi->s_qf_names[i] &&
3730 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3731 kfree(sbi->s_qf_names[i]);
3732 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3733 }
3734#endif
bbd6851a 3735 unlock_super(sb);
337eb00a 3736 unlock_kernel();
ac27a0ec
DK		 3737 return err;
3738}
3739
2b2d6d01 3740static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3741{
3742 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3743 struct ext4_sb_info *sbi = EXT4_SB(sb);
3744 struct ext4_super_block *es = sbi->s_es;
960cc398 3745 u64 fsid;
ac27a0ec 3746
5e70030d
BP		 3747 if (test_opt(sb, MINIX_DF)) {
3748 sbi->s_overhead_last = 0;
6bc9feff 3749 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3750 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3751 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3752
3753 /*
5e70030d
BP		 3754 * Compute the overhead (FS structures). This is constant
3755 * for a given filesystem unless the number of block groups
3756 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3757 */
3758
3759 /*
3760 * All of the blocks before first_data_block are
3761 * overhead
3762 */
3763 overhead = le32_to_cpu(es->s_first_data_block);
3764
3765 /*
3766 * Add the overhead attributed to the superblock and
3767 * block group descriptors. If the sparse superblocks
3768 * feature is turned on, then not all groups have this.
3769 */
3770 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3771 overhead += ext4_bg_has_super(sb, i) +
3772 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3773 cond_resched();
3774 }
3775
3776 /*
3777 * Every block group has an inode bitmap, a block
3778 * bitmap, and an inode table.
3779 */
5e70030d
BP		 3780 overhead += ngroups * (2 + sbi->s_itb_per_group);
3781 sbi->s_overhead_last = overhead;
3782 smp_wmb();
6bc9feff 3783 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3784 }
3785
617ba13b 3786 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3787 buf->f_bsize = sb->s_blocksize;
5e70030d 3788 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3789 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3790 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
bd81d8ee
LV		 3791 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3792 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3793 buf->f_bavail = 0;
3794 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3795 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 3796 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3797 fsid = le64_to_cpup((void *)es->s_uuid) ^
3798 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3799 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3800 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 3801
ac27a0ec
DK		 3802 return 0;
3803}
3804
0b8e58a1
AD		 3805/* Helper function for writing quotas on sync - we need to start transaction
3806 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 3807 * Process 1 Process 2
617ba13b 3808 * ext4_create() quota_sync()
a269eb18 3809 * jbd2_journal_start() write_dquot()
871a2931 3810 * dquot_initialize() down(dqio_mutex)
dab291af 3811 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3812 *
3813 */
3814
3815#ifdef CONFIG_QUOTA
3816
3817static inline struct inode *dquot_to_inode(struct dquot *dquot)
3818{
3819 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3820}
3821
617ba13b 3822static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3823{
3824 int ret, err;
3825 handle_t *handle;
3826 struct inode *inode;
3827
3828 inode = dquot_to_inode(dquot);
617ba13b 3829 handle = ext4_journal_start(inode,
0b8e58a1 3830 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3831 if (IS_ERR(handle))
3832 return PTR_ERR(handle);
3833 ret = dquot_commit(dquot);
617ba13b 3834 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3835 if (!ret)
3836 ret = err;
3837 return ret;
3838}
3839
617ba13b 3840static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3841{
3842 int ret, err;
3843 handle_t *handle;
3844
617ba13b 3845 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3846 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3847 if (IS_ERR(handle))
3848 return PTR_ERR(handle);
3849 ret = dquot_acquire(dquot);
617ba13b 3850 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3851 if (!ret)
3852 ret = err;
3853 return ret;
3854}
3855
617ba13b 3856static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3857{
3858 int ret, err;
3859 handle_t *handle;
3860
617ba13b 3861 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3862 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3863 if (IS_ERR(handle)) {
3864 /* Release dquot anyway to avoid endless cycle in dqput() */
3865 dquot_release(dquot);
ac27a0ec 3866 return PTR_ERR(handle);
9c3013e9 3867 }
ac27a0ec 3868 ret = dquot_release(dquot);
617ba13b 3869 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3870 if (!ret)
3871 ret = err;
3872 return ret;
3873}
3874
617ba13b 3875static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3876{
2c8be6b2 3877 /* Are we journaling quotas? */
617ba13b
MC		 3878 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3879 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3880 dquot_mark_dquot_dirty(dquot);
617ba13b 3881 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3882 } else {
3883 return dquot_mark_dquot_dirty(dquot);
3884 }
3885}
3886
617ba13b 3887static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3888{
3889 int ret, err;
3890 handle_t *handle;
3891
3892 /* Data block + inode block */
617ba13b 3893 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3894 if (IS_ERR(handle))
3895 return PTR_ERR(handle);
3896 ret = dquot_commit_info(sb, type);
617ba13b 3897 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3898 if (!ret)
3899 ret = err;
3900 return ret;
3901}
3902
3903/*
3904 * Turn on quotas during mount time - we need to find
3905 * the quota file and such...
3906 */
617ba13b 3907static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3908{
617ba13b 3909 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
0b8e58a1 3910 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3911}
3912
3913/*
3914 * Standard function to be called on quota_on
3915 */
617ba13b 3916static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3917 char *name, int remount)
ac27a0ec
DK		 3918{
3919 int err;
8264613d 3920 struct path path;
ac27a0ec
DK		 3921
3922 if (!test_opt(sb, QUOTA))
3923 return -EINVAL;
8264613d 3924 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3925 if (remount)
8264613d 3926 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3927
8264613d 3928 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3929 if (err)
3930 return err;
0623543b 3931
ac27a0ec 3932 /* Quotafile not on the same filesystem? */
8264613d
AV		 3933 if (path.mnt->mnt_sb != sb) {
3934 path_put(&path);
ac27a0ec
DK		 3935 return -EXDEV;
3936 }
0623543b
JK		 3937 /* Journaling quota? */
3938 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3939 /* Quotafile not in fs root? */
8264613d 3940 if (path.dentry->d_parent != sb->s_root)
b31e1552
ES		 3941 ext4_msg(sb, KERN_WARNING,
3942 "Quota file not on filesystem root. "
3943 "Journaled quota will not work");
2b2d6d01 3944 }
0623543b
JK		 3945
3946 /*
3947 * When we journal data on quota file, we have to flush journal to see
3948 * all updates to the file when we bypass pagecache...
3949 */
0390131b
FM		 3950 if (EXT4_SB(sb)->s_journal &&
3951 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3952 /*
3953 * We don't need to lock updates but journal_flush() could
3954 * otherwise be livelocked...
3955 */
3956 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3957 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3958 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3959 if (err) {
8264613d 3960 path_put(&path);
7ffe1ea8
HK		 3961 return err;
3962 }
0623543b
JK		 3963 }
3964
8264613d
AV		 3965 err = vfs_quota_on_path(sb, type, format_id, &path);
3966 path_put(&path);
77e69dac 3967 return err;
ac27a0ec
DK		 3968}
3969
3970/* Read data from quotafile - avoid pagecache and such because we cannot afford
3971 * acquiring the locks... As quota files are never truncated and quota code
3972 * itself serializes the operations (and noone else should touch the files)
3973 * we don't have to be afraid of races */
617ba13b 3974static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3975 size_t len, loff_t off)
3976{
3977 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3978 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3979 int err = 0;
3980 int offset = off & (sb->s_blocksize - 1);
3981 int tocopy;
3982 size_t toread;
3983 struct buffer_head *bh;
3984 loff_t i_size = i_size_read(inode);
3985
3986 if (off > i_size)
3987 return 0;
3988 if (off+len > i_size)
3989 len = i_size-off;
3990 toread = len;
3991 while (toread > 0) {
3992 tocopy = sb->s_blocksize - offset < toread ?
3993 sb->s_blocksize - offset : toread;
617ba13b 3994 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3995 if (err)
3996 return err;
3997 if (!bh) /* A hole? */
3998 memset(data, 0, tocopy);
3999 else
4000 memcpy(data, bh->b_data+offset, tocopy);
4001 brelse(bh);
4002 offset = 0;
4003 toread -= tocopy;
4004 data += tocopy;
4005 blk++;
4006 }
4007 return len;
4008}
4009
4010/* Write to quotafile (we know the transaction is already started and has
4011 * enough credits) */
617ba13b 4012static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4013 const char *data, size_t len, loff_t off)
4014{
4015 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4016 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4017 int err = 0;
4018 int offset = off & (sb->s_blocksize - 1);
617ba13b 4019 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 4020 struct buffer_head *bh;
4021 handle_t *handle = journal_current_handle();
4022
0390131b 4023 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4024 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4025 " cancelled because transaction is not started",
9c3013e9
JK		 4026 (unsigned long long)off, (unsigned long long)len);
4027 return -EIO;
4028 }
67eeb568
DM		 4029 /*
4030 * Since we account only one data block in transaction credits,
4031 * then it is impossible to cross a block boundary.
4032 */
4033 if (sb->s_blocksize - offset < len) {
4034 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4035 " cancelled because not block aligned",
4036 (unsigned long long)off, (unsigned long long)len);
4037 return -EIO;
4038 }
4039
ac27a0ec 4040 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4041 bh = ext4_bread(handle, inode, blk, 1, &err);
4042 if (!bh)
4043 goto out;
4044 if (journal_quota) {
4045 err = ext4_journal_get_write_access(handle, bh);
4046 if (err) {
4047 brelse(bh);
ac27a0ec 4048 goto out;
ac27a0ec 4049 }
ac27a0ec 4050 }
67eeb568
DM		 4051 lock_buffer(bh);
4052 memcpy(bh->b_data+offset, data, len);
4053 flush_dcache_page(bh->b_page);
4054 unlock_buffer(bh);
4055 if (journal_quota)
4056 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4057 else {
4058 /* Always do at least ordered writes for quotas */
4059 err = ext4_jbd2_file_inode(handle, inode);
4060 mark_buffer_dirty(bh);
4061 }
4062 brelse(bh);
ac27a0ec 4063out:
67eeb568 4064 if (err) {
4d04e4fb 4065 mutex_unlock(&inode->i_mutex);
ac27a0ec 4066 return err;
4d04e4fb 4067 }
67eeb568
DM		 4068 if (inode->i_size < off + len) {
4069 i_size_write(inode, off + len);
617ba13b 4070 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 4071 }
ac27a0ec 4072 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 4073 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4074 mutex_unlock(&inode->i_mutex);
67eeb568 4075 return len;
ac27a0ec
DK		 4076}
4077
4078#endif
4079
0b8e58a1
AD		 4080static int ext4_get_sb(struct file_system_type *fs_type, int flags,
4081 const char *dev_name, void *data, struct vfsmount *mnt)
ac27a0ec 4082{
0b8e58a1 4083 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
ac27a0ec
DK		 4084}
4085
37f328eb 4086#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4087static struct file_system_type ext2_fs_type = {
4088 .owner = THIS_MODULE,
4089 .name = "ext2",
4090 .get_sb = ext4_get_sb,
4091 .kill_sb = kill_block_super,
4092 .fs_flags = FS_REQUIRES_DEV,
4093};
4094
4095static inline void register_as_ext2(void)
4096{
4097 int err = register_filesystem(&ext2_fs_type);
4098 if (err)
4099 printk(KERN_WARNING
4100 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4101}
4102
4103static inline void unregister_as_ext2(void)
4104{
4105 unregister_filesystem(&ext2_fs_type);
4106}
51b7e3c9 4107MODULE_ALIAS("ext2");
24b58424
TT		 4108#else
4109static inline void register_as_ext2(void) { }
4110static inline void unregister_as_ext2(void) { }
4111#endif
4112
37f328eb 4113#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4114static inline void register_as_ext3(void)
4115{
4116 int err = register_filesystem(&ext3_fs_type);
4117 if (err)
4118 printk(KERN_WARNING
4119 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4120}
4121
4122static inline void unregister_as_ext3(void)
4123{
4124 unregister_filesystem(&ext3_fs_type);
4125}
51b7e3c9 4126MODULE_ALIAS("ext3");
24b58424
TT		 4127#else
4128static inline void register_as_ext3(void) { }
4129static inline void unregister_as_ext3(void) { }
4130#endif
4131
03010a33
TT		 4132static struct file_system_type ext4_fs_type = {
4133 .owner = THIS_MODULE,
4134 .name = "ext4",
4135 .get_sb = ext4_get_sb,
4136 .kill_sb = kill_block_super,
4137 .fs_flags = FS_REQUIRES_DEV,
4138};
4139
617ba13b 4140static int __init init_ext4_fs(void)
ac27a0ec 4141{
c9de560d
AT		 4142 int err;
4143
6fd058f7
TT		 4144 err = init_ext4_system_zone();
4145 if (err)
4146 return err;
3197ebdb
TT		 4147 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4148 if (!ext4_kset)
6fd058f7 4149 goto out4;
9f6200bb 4150 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 4151 err = init_ext4_mballoc();
ac27a0ec 4152 if (err)
6fd058f7 4153 goto out3;
c9de560d
AT		 4154
4155 err = init_ext4_xattr();
4156 if (err)
4157 goto out2;
ac27a0ec
DK		 4158 err = init_inodecache();
4159 if (err)
4160 goto out1;
24b58424
TT		 4161 register_as_ext2();
4162 register_as_ext3();
03010a33 4163 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4164 if (err)
4165 goto out;
4166 return 0;
4167out:
24b58424
TT		 4168 unregister_as_ext2();
4169 unregister_as_ext3();
ac27a0ec
DK		 4170 destroy_inodecache();
4171out1:
617ba13b 4172 exit_ext4_xattr();
c9de560d
AT		 4173out2:
4174 exit_ext4_mballoc();
6fd058f7
TT		 4175out3:
4176 remove_proc_entry("fs/ext4", NULL);
4177 kset_unregister(ext4_kset);
4178out4:
4179 exit_ext4_system_zone();
ac27a0ec
DK		 4180 return err;
4181}
4182
617ba13b 4183static void __exit exit_ext4_fs(void)
ac27a0ec 4184{
24b58424
TT		 4185 unregister_as_ext2();
4186 unregister_as_ext3();
03010a33 4187 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4188 destroy_inodecache();
617ba13b 4189 exit_ext4_xattr();
c9de560d 4190 exit_ext4_mballoc();
9f6200bb 4191 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4192 kset_unregister(ext4_kset);
6fd058f7 4193 exit_ext4_system_zone();
ac27a0ec
DK		 4194}
4195
4196MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4197MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4198MODULE_LICENSE("GPL");
617ba13b
MC		 4199module_init(init_ext4_fs)
4200module_exit(exit_ext4_fs)
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