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ext4: Wait for proper transaction commit on fsync
[net-next-2.6.git] / fs / ext4 / super.c
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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);
ac27a0ec 71
bd81d8ee 72
8fadc143
AR		 73ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
74 struct ext4_group_desc *bg)
bd81d8ee 75{
3a14589c 76 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 77 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 78 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 79}
80
8fadc143
AR		 81ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
82 struct ext4_group_desc *bg)
bd81d8ee 83{
5272f837 84 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 85 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 86 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 87}
88
8fadc143
AR		 89ext4_fsblk_t ext4_inode_table(struct super_block *sb,
90 struct ext4_group_desc *bg)
bd81d8ee 91{
5272f837 92 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 93 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 94 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 95}
96
560671a0
AK		 97__u32 ext4_free_blks_count(struct super_block *sb,
98 struct ext4_group_desc *bg)
99{
100 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
101 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 102 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 103}
104
105__u32 ext4_free_inodes_count(struct super_block *sb,
106 struct ext4_group_desc *bg)
107{
108 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
109 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 110 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 111}
112
113__u32 ext4_used_dirs_count(struct super_block *sb,
114 struct ext4_group_desc *bg)
115{
116 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
117 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 118 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 119}
120
121__u32 ext4_itable_unused_count(struct super_block *sb,
122 struct ext4_group_desc *bg)
123{
124 return le16_to_cpu(bg->bg_itable_unused_lo) |
125 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 126 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 127}
128
8fadc143
AR		 129void ext4_block_bitmap_set(struct super_block *sb,
130 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 131{
3a14589c 132 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 133 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
134 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 135}
136
8fadc143
AR		 137void ext4_inode_bitmap_set(struct super_block *sb,
138 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 139{
5272f837 140 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 141 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
142 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 143}
144
8fadc143
AR		 145void ext4_inode_table_set(struct super_block *sb,
146 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 147{
5272f837 148 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 149 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
150 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 151}
152
560671a0
AK		 153void ext4_free_blks_set(struct super_block *sb,
154 struct ext4_group_desc *bg, __u32 count)
155{
156 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
157 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
158 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
159}
160
161void ext4_free_inodes_set(struct super_block *sb,
162 struct ext4_group_desc *bg, __u32 count)
163{
164 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
165 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
166 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
167}
168
169void ext4_used_dirs_set(struct super_block *sb,
170 struct ext4_group_desc *bg, __u32 count)
171{
172 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
173 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
174 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
175}
176
177void ext4_itable_unused_set(struct super_block *sb,
178 struct ext4_group_desc *bg, __u32 count)
179{
180 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
181 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
182 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
183}
184
d3d1faf6
CW		 185
186/* Just increment the non-pointer handle value */
187static handle_t *ext4_get_nojournal(void)
188{
189 handle_t *handle = current->journal_info;
190 unsigned long ref_cnt = (unsigned long)handle;
191
192 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
193
194 ref_cnt++;
195 handle = (handle_t *)ref_cnt;
196
197 current->journal_info = handle;
198 return handle;
199}
200
201
202/* Decrement the non-pointer handle value */
203static void ext4_put_nojournal(handle_t *handle)
204{
205 unsigned long ref_cnt = (unsigned long)handle;
206
207 BUG_ON(ref_cnt == 0);
208
209 ref_cnt--;
210 handle = (handle_t *)ref_cnt;
211
212 current->journal_info = handle;
213}
214
ac27a0ec 215/*
dab291af 216 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 217 *
218 * The only special thing we need to do here is to make sure that all
219 * journal_end calls result in the superblock being marked dirty, so
220 * that sync() will call the filesystem's write_super callback if
221 * appropriate.
222 */
617ba13b 223handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 224{
225 journal_t *journal;
226
227 if (sb->s_flags & MS_RDONLY)
228 return ERR_PTR(-EROFS);
229
230 /* Special case here: if the journal has aborted behind our
231 * backs (eg. EIO in the commit thread), then we still need to
232 * take the FS itself readonly cleanly. */
617ba13b 233 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 234 if (journal) {
235 if (is_journal_aborted(journal)) {
0b8e58a1 236 ext4_abort(sb, __func__, "Detected aborted journal");
0390131b
FM		 237 return ERR_PTR(-EROFS);
238 }
239 return jbd2_journal_start(journal, nblocks);
ac27a0ec 240 }
d3d1faf6 241 return ext4_get_nojournal();
ac27a0ec
DK		 242}
243
244/*
245 * The only special thing we need to do here is to make sure that all
dab291af 246 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 247 * that sync() will call the filesystem's write_super callback if
248 * appropriate.
249 */
617ba13b 250int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 251{
252 struct super_block *sb;
253 int err;
254 int rc;
255
0390131b 256 if (!ext4_handle_valid(handle)) {
d3d1faf6 257 ext4_put_nojournal(handle);
0390131b
FM		 258 return 0;
259 }
ac27a0ec
DK		 260 sb = handle->h_transaction->t_journal->j_private;
261 err = handle->h_err;
dab291af 262 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 263
264 if (!err)
265 err = rc;
266 if (err)
617ba13b 267 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 268 return err;
269}
270
617ba13b 271void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 272 struct buffer_head *bh, handle_t *handle, int err)
273{
274 char nbuf[16];
617ba13b 275 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 276
0390131b
FM		 277 BUG_ON(!ext4_handle_valid(handle));
278
ac27a0ec
DK		 279 if (bh)
280 BUFFER_TRACE(bh, "abort");
281
282 if (!handle->h_err)
283 handle->h_err = err;
284
285 if (is_handle_aborted(handle))
286 return;
287
288 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
289 caller, errstr, err_fn);
290
dab291af 291 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 292}
293
294/* Deal with the reporting of failure conditions on a filesystem such as
295 * inconsistencies detected or read IO failures.
296 *
297 * On ext2, we can store the error state of the filesystem in the
617ba13b 298 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 299 * write ordering constraints on the superblock which prevent us from
300 * writing it out straight away; and given that the journal is about to
301 * be aborted, we can't rely on the current, or future, transactions to
302 * write out the superblock safely.
303 *
dab291af 304 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 305 * the journal instead. On recovery, the journal will compain about
306 * that error until we've noted it down and cleared it.
307 */
308
617ba13b 309static void ext4_handle_error(struct super_block *sb)
ac27a0ec 310{
617ba13b 311 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 312
617ba13b
MC		 313 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
314 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 315
316 if (sb->s_flags & MS_RDONLY)
317 return;
318
2b2d6d01 319 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 320 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 321
4ab2f15b 322 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 323 if (journal)
dab291af 324 jbd2_journal_abort(journal, -EIO);
ac27a0ec 325 }
2b2d6d01 326 if (test_opt(sb, ERRORS_RO)) {
b31e1552 327 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 328 sb->s_flags |= MS_RDONLY;
329 }
e2d67052 330 ext4_commit_super(sb, 1);
ac27a0ec 331 if (test_opt(sb, ERRORS_PANIC))
617ba13b 332 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 333 sb->s_id);
334}
335
2b2d6d01
TT		 336void ext4_error(struct super_block *sb, const char *function,
337 const char *fmt, ...)
ac27a0ec
DK		 338{
339 va_list args;
340
341 va_start(args, fmt);
2b2d6d01 342 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 343 vprintk(fmt, args);
344 printk("\n");
345 va_end(args);
346
617ba13b 347 ext4_handle_error(sb);
ac27a0ec
DK		 348}
349
2b2d6d01 350static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 351 char nbuf[16])
352{
353 char *errstr = NULL;
354
355 switch (errno) {
356 case -EIO:
357 errstr = "IO failure";
358 break;
359 case -ENOMEM:
360 errstr = "Out of memory";
361 break;
362 case -EROFS:
78f1ddbb
TT		 363 if (!sb || (EXT4_SB(sb)->s_journal &&
364 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 365 errstr = "Journal has aborted";
366 else
367 errstr = "Readonly filesystem";
368 break;
369 default:
370 /* If the caller passed in an extra buffer for unknown
371 * errors, textualise them now. Else we just return
372 * NULL. */
373 if (nbuf) {
374 /* Check for truncated error codes... */
375 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
376 errstr = nbuf;
377 }
378 break;
379 }
380
381 return errstr;
382}
383
617ba13b 384/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 385 * automatically and invokes the appropriate error response. */
386
2b2d6d01 387void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 388{
389 char nbuf[16];
390 const char *errstr;
391
392 /* Special case: if the error is EROFS, and we're not already
393 * inside a transaction, then there's really no point in logging
394 * an error. */
395 if (errno == -EROFS && journal_current_handle() == NULL &&
396 (sb->s_flags & MS_RDONLY))
397 return;
398
617ba13b 399 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 400 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
401 sb->s_id, function, errstr);
ac27a0ec 402
617ba13b 403 ext4_handle_error(sb);
ac27a0ec
DK		 404}
405
406/*
617ba13b 407 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 408 * abort function may be used to deal with unrecoverable failures such
409 * as journal IO errors or ENOMEM at a critical moment in log management.
410 *
411 * We unconditionally force the filesystem into an ABORT|READONLY state,
412 * unless the error response on the fs has been set to panic in which
413 * case we take the easy way out and panic immediately.
414 */
415
2b2d6d01
TT		 416void ext4_abort(struct super_block *sb, const char *function,
417 const char *fmt, ...)
ac27a0ec
DK		 418{
419 va_list args;
420
ac27a0ec 421 va_start(args, fmt);
2b2d6d01 422 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 423 vprintk(fmt, args);
424 printk("\n");
425 va_end(args);
426
427 if (test_opt(sb, ERRORS_PANIC))
617ba13b 428 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 429
430 if (sb->s_flags & MS_RDONLY)
431 return;
432
b31e1552 433 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
617ba13b 434 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 435 sb->s_flags |= MS_RDONLY;
4ab2f15b 436 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ef2cabf7
HK		 437 if (EXT4_SB(sb)->s_journal)
438 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 439}
440
b31e1552
ES		 441void ext4_msg (struct super_block * sb, const char *prefix,
442 const char *fmt, ...)
443{
444 va_list args;
445
446 va_start(args, fmt);
447 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
448 vprintk(fmt, args);
449 printk("\n");
450 va_end(args);
451}
452
2b2d6d01
TT		 453void ext4_warning(struct super_block *sb, const char *function,
454 const char *fmt, ...)
ac27a0ec
DK		 455{
456 va_list args;
457
458 va_start(args, fmt);
617ba13b 459 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 460 sb->s_id, function);
461 vprintk(fmt, args);
462 printk("\n");
463 va_end(args);
464}
465
5d1b1b3f 466void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
0b8e58a1 467 const char *function, const char *fmt, ...)
5d1b1b3f
AK		 468__releases(bitlock)
469__acquires(bitlock)
470{
471 va_list args;
472 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
473
474 va_start(args, fmt);
475 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
476 vprintk(fmt, args);
477 printk("\n");
478 va_end(args);
479
480 if (test_opt(sb, ERRORS_CONT)) {
481 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
482 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 483 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 484 return;
485 }
486 ext4_unlock_group(sb, grp);
487 ext4_handle_error(sb);
488 /*
489 * We only get here in the ERRORS_RO case; relocking the group
490 * may be dangerous, but nothing bad will happen since the
491 * filesystem will have already been marked read/only and the
492 * journal has been aborted. We return 1 as a hint to callers
493 * who might what to use the return value from
494 * ext4_grp_locked_error() to distinguish beween the
495 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
496 * aggressively from the ext4 function in question, with a
497 * more appropriate error code.
498 */
499 ext4_lock_group(sb, grp);
500 return;
501}
502
617ba13b 503void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 504{
617ba13b 505 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 506
617ba13b 507 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 508 return;
509
46e665e9 510 ext4_warning(sb, __func__,
ac27a0ec
DK		 511 "updating to rev %d because of new feature flag, "
512 "running e2fsck is recommended",
617ba13b 513 EXT4_DYNAMIC_REV);
ac27a0ec 514
617ba13b
MC		 515 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
516 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
517 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 518 /* leave es->s_feature_*compat flags alone */
519 /* es->s_uuid will be set by e2fsck if empty */
520
521 /*
522 * The rest of the superblock fields should be zero, and if not it
523 * means they are likely already in use, so leave them alone. We
524 * can leave it up to e2fsck to clean up any inconsistencies there.
525 */
526}
527
528/*
529 * Open the external journal device
530 */
b31e1552 531static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 532{
533 struct block_device *bdev;
534 char b[BDEVNAME_SIZE];
535
536 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
537 if (IS_ERR(bdev))
538 goto fail;
539 return bdev;
540
541fail:
b31e1552 542 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 543 __bdevname(dev, b), PTR_ERR(bdev));
544 return NULL;
545}
546
547/*
548 * Release the journal device
549 */
617ba13b 550static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 551{
552 bd_release(bdev);
9a1c3542 553 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 554}
555
617ba13b 556static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 557{
558 struct block_device *bdev;
559 int ret = -ENODEV;
560
561 bdev = sbi->journal_bdev;
562 if (bdev) {
617ba13b 563 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 564 sbi->journal_bdev = NULL;
565 }
566 return ret;
567}
568
569static inline struct inode *orphan_list_entry(struct list_head *l)
570{
617ba13b 571 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 572}
573
617ba13b 574static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 575{
576 struct list_head *l;
577
b31e1552
ES		 578 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
579 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 580
581 printk(KERN_ERR "sb_info orphan list:\n");
582 list_for_each(l, &sbi->s_orphan) {
583 struct inode *inode = orphan_list_entry(l);
584 printk(KERN_ERR " "
585 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
586 inode->i_sb->s_id, inode->i_ino, inode,
587 inode->i_mode, inode->i_nlink,
588 NEXT_ORPHAN(inode));
589 }
590}
591
2b2d6d01 592static void ext4_put_super(struct super_block *sb)
ac27a0ec 593{
617ba13b
MC		 594 struct ext4_sb_info *sbi = EXT4_SB(sb);
595 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 596 int i, err;
ac27a0ec 597
4c0425ff
MC		 598 flush_workqueue(sbi->dio_unwritten_wq);
599 destroy_workqueue(sbi->dio_unwritten_wq);
600
a9e220f8 601 lock_super(sb);
6cfd0148 602 lock_kernel();
8c85e125 603 if (sb->s_dirt)
ebc1ac16 604 ext4_commit_super(sb, 1);
8c85e125 605
0390131b
FM		 606 if (sbi->s_journal) {
607 err = jbd2_journal_destroy(sbi->s_journal);
608 sbi->s_journal = NULL;
609 if (err < 0)
610 ext4_abort(sb, __func__,
611 "Couldn't clean up the journal");
612 }
d4edac31
JB		 613
614 ext4_release_system_zone(sb);
615 ext4_mb_release(sb);
616 ext4_ext_release(sb);
617 ext4_xattr_put_super(sb);
618
ac27a0ec 619 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 620 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 621 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 622 ext4_commit_super(sb, 1);
ac27a0ec 623 }
240799cd 624 if (sbi->s_proc) {
9f6200bb 625 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 626 }
3197ebdb 627 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 628
629 for (i = 0; i < sbi->s_gdb_count; i++)
630 brelse(sbi->s_group_desc[i]);
631 kfree(sbi->s_group_desc);
c5ca7c76
TT		 632 if (is_vmalloc_addr(sbi->s_flex_groups))
633 vfree(sbi->s_flex_groups);
634 else
635 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 636 percpu_counter_destroy(&sbi->s_freeblocks_counter);
637 percpu_counter_destroy(&sbi->s_freeinodes_counter);
638 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 639 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 640 brelse(sbi->s_sbh);
641#ifdef CONFIG_QUOTA
642 for (i = 0; i < MAXQUOTAS; i++)
643 kfree(sbi->s_qf_names[i]);
644#endif
645
646 /* Debugging code just in case the in-memory inode orphan list
647 * isn't empty. The on-disk one can be non-empty if we've
648 * detected an error and taken the fs readonly, but the
649 * in-memory list had better be clean by this point. */
650 if (!list_empty(&sbi->s_orphan))
651 dump_orphan_list(sb, sbi);
652 J_ASSERT(list_empty(&sbi->s_orphan));
653
f98393a6 654 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 655 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
656 /*
657 * Invalidate the journal device's buffers. We don't want them
658 * floating about in memory - the physical journal device may
659 * hotswapped, and it breaks the `ro-after' testing code.
660 */
661 sync_blockdev(sbi->journal_bdev);
f98393a6 662 invalidate_bdev(sbi->journal_bdev);
617ba13b 663 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 664 }
665 sb->s_fs_info = NULL;
3197ebdb
TT		 666 /*
667 * Now that we are completely done shutting down the
668 * superblock, we need to actually destroy the kobject.
669 */
670 unlock_kernel();
671 unlock_super(sb);
672 kobject_put(&sbi->s_kobj);
673 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 674 kfree(sbi->s_blockgroup_lock);
ac27a0ec 675 kfree(sbi);
ac27a0ec
DK		 676}
677
e18b890b 678static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 679
680/*
681 * Called inside transaction, so use GFP_NOFS
682 */
617ba13b 683static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 684{
617ba13b 685 struct ext4_inode_info *ei;
ac27a0ec 686
e6b4f8da 687 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 688 if (!ei)
689 return NULL;
0b8e58a1 690
ac27a0ec 691 ei->vfs_inode.i_version = 1;
91246c00 692 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 693 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 694 INIT_LIST_HEAD(&ei->i_prealloc_list);
695 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 696 /*
697 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
698 * therefore it can be null here. Don't check it, just initialize
699 * jinode.
700 */
678aaf48 701 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 702 ei->i_reserved_data_blocks = 0;
703 ei->i_reserved_meta_blocks = 0;
704 ei->i_allocated_meta_blocks = 0;
705 ei->i_delalloc_reserved_flag = 0;
706 spin_lock_init(&(ei->i_block_reservation_lock));
8d5d02e6
MC		 707 INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
708 ei->cur_aio_dio = NULL;
b436b9be
JK		 709 ei->i_sync_tid = 0;
710 ei->i_datasync_tid = 0;
0b8e58a1 711
ac27a0ec
DK		 712 return &ei->vfs_inode;
713}
714
617ba13b 715static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 716{
9f7dd93d 717 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 718 ext4_msg(inode->i_sb, KERN_ERR,
719 "Inode %lu (%p): orphan list check failed!",
720 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 721 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
722 EXT4_I(inode), sizeof(struct ext4_inode_info),
723 true);
724 dump_stack();
725 }
617ba13b 726 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 727}
728
51cc5068 729static void init_once(void *foo)
ac27a0ec 730{
617ba13b 731 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 732
a35afb83 733 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 734#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 735 init_rwsem(&ei->xattr_sem);
ac27a0ec 736#endif
0e855ac8 737 init_rwsem(&ei->i_data_sem);
a35afb83 738 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 739}
740
741static int init_inodecache(void)
742{
617ba13b
MC		 743 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
744 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 745 0, (SLAB_RECLAIM_ACCOUNT|
746 SLAB_MEM_SPREAD),
20c2df83 747 init_once);
617ba13b 748 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 749 return -ENOMEM;
750 return 0;
751}
752
753static void destroy_inodecache(void)
754{
617ba13b 755 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 756}
757
617ba13b 758static void ext4_clear_inode(struct inode *inode)
ac27a0ec 759{
c2ea3fde 760 ext4_discard_preallocations(inode);
0390131b
FM		 761 if (EXT4_JOURNAL(inode))
762 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 763 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 764}
765
2b2d6d01
TT		 766static inline void ext4_show_quota_options(struct seq_file *seq,
767 struct super_block *sb)
ac27a0ec
DK		 768{
769#if defined(CONFIG_QUOTA)
617ba13b 770 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 771
772 if (sbi->s_jquota_fmt)
773 seq_printf(seq, ",jqfmt=%s",
af5bc92d 774 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 775
776 if (sbi->s_qf_names[USRQUOTA])
777 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
778
779 if (sbi->s_qf_names[GRPQUOTA])
780 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
781
617ba13b 782 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 783 seq_puts(seq, ",usrquota");
784
617ba13b 785 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 786 seq_puts(seq, ",grpquota");
787#endif
788}
789
d9c9bef1
MS		 790/*
791 * Show an option if
792 * - it's set to a non-default value OR
793 * - if the per-sb default is different from the global default
794 */
617ba13b 795static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 796{
aa22df2c
AK		 797 int def_errors;
798 unsigned long def_mount_opts;
ac27a0ec 799 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 800 struct ext4_sb_info *sbi = EXT4_SB(sb);
801 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 802
803 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 804 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 805
806 if (sbi->s_sb_block != 1)
807 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
808 if (test_opt(sb, MINIX_DF))
809 seq_puts(seq, ",minixdf");
aa22df2c 810 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 811 seq_puts(seq, ",grpid");
812 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
813 seq_puts(seq, ",nogrpid");
814 if (sbi->s_resuid != EXT4_DEF_RESUID ||
815 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
816 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
817 }
818 if (sbi->s_resgid != EXT4_DEF_RESGID ||
819 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
820 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
821 }
bb4f397a 822 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 823 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 824 def_errors == EXT4_ERRORS_CONTINUE) {
825 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 826 }
827 }
aa22df2c 828 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 829 seq_puts(seq, ",errors=continue");
aa22df2c 830 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 831 seq_puts(seq, ",errors=panic");
aa22df2c 832 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 833 seq_puts(seq, ",nouid32");
aa22df2c 834 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 835 seq_puts(seq, ",debug");
836 if (test_opt(sb, OLDALLOC))
837 seq_puts(seq, ",oldalloc");
03010a33 838#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 839 if (test_opt(sb, XATTR_USER) &&
840 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 841 seq_puts(seq, ",user_xattr");
842 if (!test_opt(sb, XATTR_USER) &&
843 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
844 seq_puts(seq, ",nouser_xattr");
845 }
846#endif
03010a33 847#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 848 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 849 seq_puts(seq, ",acl");
850 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
851 seq_puts(seq, ",noacl");
852#endif
30773840 853 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 854 seq_printf(seq, ",commit=%u",
855 (unsigned) (sbi->s_commit_interval / HZ));
856 }
30773840
TT		 857 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
858 seq_printf(seq, ",min_batch_time=%u",
859 (unsigned) sbi->s_min_batch_time);
860 }
861 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
862 seq_printf(seq, ",max_batch_time=%u",
863 (unsigned) sbi->s_min_batch_time);
864 }
865
571640ca
ES		 866 /*
867 * We're changing the default of barrier mount option, so
868 * let's always display its mount state so it's clear what its
869 * status is.
870 */
871 seq_puts(seq, ",barrier=");
872 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 873 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
874 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 875 if (test_opt(sb, NOBH))
876 seq_puts(seq, ",nobh");
25ec56b5
JNC		 877 if (test_opt(sb, I_VERSION))
878 seq_puts(seq, ",i_version");
dd919b98
AK		 879 if (!test_opt(sb, DELALLOC))
880 seq_puts(seq, ",nodelalloc");
881
ac27a0ec 882
cb45bbe4
MS		 883 if (sbi->s_stripe)
884 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 885 /*
886 * journal mode get enabled in different ways
887 * So just print the value even if we didn't specify it
888 */
617ba13b 889 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 890 seq_puts(seq, ",data=journal");
617ba13b 891 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 892 seq_puts(seq, ",data=ordered");
617ba13b 893 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 894 seq_puts(seq, ",data=writeback");
895
240799cd
TT		 896 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
897 seq_printf(seq, ",inode_readahead_blks=%u",
898 sbi->s_inode_readahead_blks);
899
5bf5683a
HK		 900 if (test_opt(sb, DATA_ERR_ABORT))
901 seq_puts(seq, ",data_err=abort");
902
afd4672d 903 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 904 seq_puts(seq, ",noauto_da_alloc");
afd4672d 905
5328e635
ES		 906 if (test_opt(sb, DISCARD))
907 seq_puts(seq, ",discard");
908
e3bb52ae
ES		 909 if (test_opt(sb, NOLOAD))
910 seq_puts(seq, ",norecovery");
911
617ba13b 912 ext4_show_quota_options(seq, sb);
0b8e58a1 913
ac27a0ec
DK		 914 return 0;
915}
916
1b961ac0 917static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 918 u64 ino, u32 generation)
ac27a0ec 919{
ac27a0ec 920 struct inode *inode;
ac27a0ec 921
617ba13b 922 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 923 return ERR_PTR(-ESTALE);
617ba13b 924 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 925 return ERR_PTR(-ESTALE);
926
927 /* iget isn't really right if the inode is currently unallocated!!
928 *
617ba13b 929 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 930 * deleted, so we should be safe.
931 *
932 * Currently we don't know the generation for parent directory, so
933 * a generation of 0 means "accept any"
934 */
1d1fe1ee
DH		 935 inode = ext4_iget(sb, ino);
936 if (IS_ERR(inode))
937 return ERR_CAST(inode);
938 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 939 iput(inode);
940 return ERR_PTR(-ESTALE);
941 }
1b961ac0
CH		 942
943 return inode;
944}
945
946static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 947 int fh_len, int fh_type)
1b961ac0
CH		 948{
949 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
950 ext4_nfs_get_inode);
951}
952
953static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 954 int fh_len, int fh_type)
1b961ac0
CH		 955{
956 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
957 ext4_nfs_get_inode);
ac27a0ec
DK		 958}
959
c39a7f84
TO		 960/*
961 * Try to release metadata pages (indirect blocks, directories) which are
962 * mapped via the block device. Since these pages could have journal heads
963 * which would prevent try_to_free_buffers() from freeing them, we must use
964 * jbd2 layer's try_to_free_buffers() function to release them.
965 */
0b8e58a1
AD		 966static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
967 gfp_t wait)
c39a7f84
TO		 968{
969 journal_t *journal = EXT4_SB(sb)->s_journal;
970
971 WARN_ON(PageChecked(page));
972 if (!page_has_buffers(page))
973 return 0;
974 if (journal)
975 return jbd2_journal_try_to_free_buffers(journal, page,
976 wait & ~__GFP_WAIT);
977 return try_to_free_buffers(page);
978}
979
ac27a0ec 980#ifdef CONFIG_QUOTA
af5bc92d 981#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 982#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 983
617ba13b
MC		 984static int ext4_write_dquot(struct dquot *dquot);
985static int ext4_acquire_dquot(struct dquot *dquot);
986static int ext4_release_dquot(struct dquot *dquot);
987static int ext4_mark_dquot_dirty(struct dquot *dquot);
988static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 989static int ext4_quota_on(struct super_block *sb, int type, int format_id,
990 char *path, int remount);
617ba13b
MC		 991static int ext4_quota_on_mount(struct super_block *sb, int type);
992static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 993 size_t len, loff_t off);
617ba13b 994static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 995 const char *data, size_t len, loff_t off);
996
61e225dc 997static const struct dquot_operations ext4_quota_operations = {
edf72453
JK		 998 .initialize = dquot_initialize,
999 .drop = dquot_drop,
ac27a0ec 1000 .alloc_space = dquot_alloc_space,
60e58e0f
MC		 1001 .reserve_space = dquot_reserve_space,
1002 .claim_space = dquot_claim_space,
1003 .release_rsv = dquot_release_reserved_space,
1004 .get_reserved_space = ext4_get_reserved_space,
ac27a0ec
DK		 1005 .alloc_inode = dquot_alloc_inode,
1006 .free_space = dquot_free_space,
1007 .free_inode = dquot_free_inode,
1008 .transfer = dquot_transfer,
617ba13b
MC		 1009 .write_dquot = ext4_write_dquot,
1010 .acquire_dquot = ext4_acquire_dquot,
1011 .release_dquot = ext4_release_dquot,
1012 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1013 .write_info = ext4_write_info,
1014 .alloc_dquot = dquot_alloc,
1015 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1016};
1017
0d54b217 1018static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1019 .quota_on = ext4_quota_on,
ac27a0ec
DK		 1020 .quota_off = vfs_quota_off,
1021 .quota_sync = vfs_quota_sync,
1022 .get_info = vfs_get_dqinfo,
1023 .set_info = vfs_set_dqinfo,
1024 .get_dqblk = vfs_get_dqblk,
1025 .set_dqblk = vfs_set_dqblk
1026};
1027#endif
1028
ee9b6d61 1029static const struct super_operations ext4_sops = {
617ba13b
MC		 1030 .alloc_inode = ext4_alloc_inode,
1031 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1032 .write_inode = ext4_write_inode,
1033 .dirty_inode = ext4_dirty_inode,
1034 .delete_inode = ext4_delete_inode,
1035 .put_super = ext4_put_super,
617ba13b 1036 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1037 .freeze_fs = ext4_freeze,
1038 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1039 .statfs = ext4_statfs,
1040 .remount_fs = ext4_remount,
1041 .clear_inode = ext4_clear_inode,
1042 .show_options = ext4_show_options,
ac27a0ec 1043#ifdef CONFIG_QUOTA
617ba13b
MC		 1044 .quota_read = ext4_quota_read,
1045 .quota_write = ext4_quota_write,
ac27a0ec 1046#endif
c39a7f84 1047 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1048};
1049
9ca92389
TT		 1050static const struct super_operations ext4_nojournal_sops = {
1051 .alloc_inode = ext4_alloc_inode,
1052 .destroy_inode = ext4_destroy_inode,
1053 .write_inode = ext4_write_inode,
1054 .dirty_inode = ext4_dirty_inode,
1055 .delete_inode = ext4_delete_inode,
1056 .write_super = ext4_write_super,
1057 .put_super = ext4_put_super,
1058 .statfs = ext4_statfs,
1059 .remount_fs = ext4_remount,
1060 .clear_inode = ext4_clear_inode,
1061 .show_options = ext4_show_options,
1062#ifdef CONFIG_QUOTA
1063 .quota_read = ext4_quota_read,
1064 .quota_write = ext4_quota_write,
1065#endif
1066 .bdev_try_to_free_page = bdev_try_to_free_page,
1067};
1068
39655164 1069static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1070 .fh_to_dentry = ext4_fh_to_dentry,
1071 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1072 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1073};
1074
1075enum {
1076 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1077 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1078 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1079 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1080 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1081 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1082 Opt_journal_update, Opt_journal_dev,
818d276c 1083 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1084 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1085 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec
DK		 1086 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1087 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
06705bff
TT		 1088 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1089 Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1090 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
6fd058f7 1091 Opt_block_validity, Opt_noblock_validity,
5328e635
ES		 1092 Opt_inode_readahead_blks, Opt_journal_ioprio,
1093 Opt_discard, Opt_nodiscard,
ac27a0ec
DK		 1094};
1095
a447c093 1096static const match_table_t tokens = {
ac27a0ec
DK		 1097 {Opt_bsd_df, "bsddf"},
1098 {Opt_minix_df, "minixdf"},
1099 {Opt_grpid, "grpid"},
1100 {Opt_grpid, "bsdgroups"},
1101 {Opt_nogrpid, "nogrpid"},
1102 {Opt_nogrpid, "sysvgroups"},
1103 {Opt_resgid, "resgid=%u"},
1104 {Opt_resuid, "resuid=%u"},
1105 {Opt_sb, "sb=%u"},
1106 {Opt_err_cont, "errors=continue"},
1107 {Opt_err_panic, "errors=panic"},
1108 {Opt_err_ro, "errors=remount-ro"},
1109 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1110 {Opt_debug, "debug"},
1111 {Opt_oldalloc, "oldalloc"},
1112 {Opt_orlov, "orlov"},
1113 {Opt_user_xattr, "user_xattr"},
1114 {Opt_nouser_xattr, "nouser_xattr"},
1115 {Opt_acl, "acl"},
1116 {Opt_noacl, "noacl"},
ac27a0ec 1117 {Opt_noload, "noload"},
e3bb52ae 1118 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1119 {Opt_nobh, "nobh"},
1120 {Opt_bh, "bh"},
1121 {Opt_commit, "commit=%u"},
30773840
TT		 1122 {Opt_min_batch_time, "min_batch_time=%u"},
1123 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1124 {Opt_journal_update, "journal=update"},
ac27a0ec 1125 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1126 {Opt_journal_checksum, "journal_checksum"},
1127 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1128 {Opt_abort, "abort"},
1129 {Opt_data_journal, "data=journal"},
1130 {Opt_data_ordered, "data=ordered"},
1131 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1132 {Opt_data_err_abort, "data_err=abort"},
1133 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1134 {Opt_offusrjquota, "usrjquota="},
1135 {Opt_usrjquota, "usrjquota=%s"},
1136 {Opt_offgrpjquota, "grpjquota="},
1137 {Opt_grpjquota, "grpjquota=%s"},
1138 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1139 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1140 {Opt_grpquota, "grpquota"},
1141 {Opt_noquota, "noquota"},
1142 {Opt_quota, "quota"},
1143 {Opt_usrquota, "usrquota"},
1144 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1145 {Opt_barrier, "barrier"},
1146 {Opt_nobarrier, "nobarrier"},
25ec56b5 1147 {Opt_i_version, "i_version"},
c9de560d 1148 {Opt_stripe, "stripe=%u"},
ac27a0ec 1149 {Opt_resize, "resize"},
64769240 1150 {Opt_delalloc, "delalloc"},
dd919b98 1151 {Opt_nodelalloc, "nodelalloc"},
6fd058f7
TT		 1152 {Opt_block_validity, "block_validity"},
1153 {Opt_noblock_validity, "noblock_validity"},
240799cd 1154 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1155 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1156 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1157 {Opt_auto_da_alloc, "auto_da_alloc"},
1158 {Opt_noauto_da_alloc, "noauto_da_alloc"},
5328e635
ES		 1159 {Opt_discard, "discard"},
1160 {Opt_nodiscard, "nodiscard"},
f3f12faa 1161 {Opt_err, NULL},
ac27a0ec
DK		 1162};
1163
617ba13b 1164static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1165{
617ba13b 1166 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1167 char *options = (char *) *data;
1168
1169 if (!options || strncmp(options, "sb=", 3) != 0)
1170 return 1; /* Default location */
0b8e58a1 1171
ac27a0ec 1172 options += 3;
0b8e58a1 1173 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1174 sb_block = simple_strtoul(options, &options, 0);
1175 if (*options && *options != ',') {
4776004f 1176 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1177 (char *) *data);
1178 return 1;
1179 }
1180 if (*options == ',')
1181 options++;
1182 *data = (void *) options;
0b8e58a1 1183
ac27a0ec
DK		 1184 return sb_block;
1185}
1186
b3881f74
TT		 1187#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1188
2b2d6d01 1189static int parse_options(char *options, struct super_block *sb,
c3191067 1190 unsigned long *journal_devnum,
b3881f74 1191 unsigned int *journal_ioprio,
2b2d6d01 1192 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1193{
617ba13b 1194 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1195 char *p;
ac27a0ec
DK		 1196 substring_t args[MAX_OPT_ARGS];
1197 int data_opt = 0;
1198 int option;
1199#ifdef CONFIG_QUOTA
dfc5d03f 1200 int qtype, qfmt;
ac27a0ec
DK		 1201 char *qname;
1202#endif
1203
1204 if (!options)
1205 return 1;
1206
2b2d6d01 1207 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1208 int token;
1209 if (!*p)
1210 continue;
1211
1212 token = match_token(p, tokens, args);
1213 switch (token) {
1214 case Opt_bsd_df:
2b2d6d01 1215 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1216 break;
1217 case Opt_minix_df:
2b2d6d01 1218 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1219 break;
1220 case Opt_grpid:
2b2d6d01 1221 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1222 break;
1223 case Opt_nogrpid:
2b2d6d01 1224 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1225 break;
1226 case Opt_resuid:
1227 if (match_int(&args[0], &option))
1228 return 0;
1229 sbi->s_resuid = option;
1230 break;
1231 case Opt_resgid:
1232 if (match_int(&args[0], &option))
1233 return 0;
1234 sbi->s_resgid = option;
1235 break;
1236 case Opt_sb:
1237 /* handled by get_sb_block() instead of here */
1238 /* *sb_block = match_int(&args[0]); */
1239 break;
1240 case Opt_err_panic:
2b2d6d01
TT		 1241 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1242 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1243 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1244 break;
1245 case Opt_err_ro:
2b2d6d01
TT		 1246 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1247 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1248 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1249 break;
1250 case Opt_err_cont:
2b2d6d01
TT		 1251 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1252 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1253 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1254 break;
1255 case Opt_nouid32:
2b2d6d01 1256 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1257 break;
ac27a0ec 1258 case Opt_debug:
2b2d6d01 1259 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1260 break;
1261 case Opt_oldalloc:
2b2d6d01 1262 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1263 break;
1264 case Opt_orlov:
2b2d6d01 1265 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1266 break;
03010a33 1267#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1268 case Opt_user_xattr:
2b2d6d01 1269 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1270 break;
1271 case Opt_nouser_xattr:
2b2d6d01 1272 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1273 break;
1274#else
1275 case Opt_user_xattr:
1276 case Opt_nouser_xattr:
b31e1552 1277 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1278 break;
1279#endif
03010a33 1280#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1281 case Opt_acl:
1282 set_opt(sbi->s_mount_opt, POSIX_ACL);
1283 break;
1284 case Opt_noacl:
1285 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1286 break;
1287#else
1288 case Opt_acl:
1289 case Opt_noacl:
b31e1552 1290 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1291 break;
1292#endif
ac27a0ec
DK		 1293 case Opt_journal_update:
1294 /* @@@ FIXME */
1295 /* Eventually we will want to be able to create
1296 a journal file here. For now, only allow the
1297 user to specify an existing inode to be the
1298 journal file. */
1299 if (is_remount) {
b31e1552
ES		 1300 ext4_msg(sb, KERN_ERR,
1301 "Cannot specify journal on remount");
ac27a0ec
DK		 1302 return 0;
1303 }
2b2d6d01 1304 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1305 break;
ac27a0ec
DK		 1306 case Opt_journal_dev:
1307 if (is_remount) {
b31e1552
ES		 1308 ext4_msg(sb, KERN_ERR,
1309 "Cannot specify journal on remount");
ac27a0ec
DK		 1310 return 0;
1311 }
1312 if (match_int(&args[0], &option))
1313 return 0;
1314 *journal_devnum = option;
1315 break;
818d276c 1316 case Opt_journal_checksum:
d4da6c9c
LT		 1317 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1318 break;
818d276c
GS		 1319 case Opt_journal_async_commit:
1320 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
d4da6c9c 1321 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
818d276c 1322 break;
ac27a0ec 1323 case Opt_noload:
2b2d6d01 1324 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1325 break;
1326 case Opt_commit:
1327 if (match_int(&args[0], &option))
1328 return 0;
1329 if (option < 0)
1330 return 0;
1331 if (option == 0)
cd02ff0b 1332 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1333 sbi->s_commit_interval = HZ * option;
1334 break;
30773840
TT		 1335 case Opt_max_batch_time:
1336 if (match_int(&args[0], &option))
1337 return 0;
1338 if (option < 0)
1339 return 0;
1340 if (option == 0)
1341 option = EXT4_DEF_MAX_BATCH_TIME;
1342 sbi->s_max_batch_time = option;
1343 break;
1344 case Opt_min_batch_time:
1345 if (match_int(&args[0], &option))
1346 return 0;
1347 if (option < 0)
1348 return 0;
1349 sbi->s_min_batch_time = option;
1350 break;
ac27a0ec 1351 case Opt_data_journal:
617ba13b 1352 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1353 goto datacheck;
1354 case Opt_data_ordered:
617ba13b 1355 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1356 goto datacheck;
1357 case Opt_data_writeback:
617ba13b 1358 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1359 datacheck:
1360 if (is_remount) {
617ba13b 1361 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec 1362 != data_opt) {
b31e1552
ES		 1363 ext4_msg(sb, KERN_ERR,
1364 "Cannot change data mode on remount");
ac27a0ec
DK		 1365 return 0;
1366 }
1367 } else {
617ba13b 1368 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1369 sbi->s_mount_opt |= data_opt;
1370 }
1371 break;
5bf5683a
HK		 1372 case Opt_data_err_abort:
1373 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1374 break;
1375 case Opt_data_err_ignore:
1376 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1377 break;
ac27a0ec
DK		 1378#ifdef CONFIG_QUOTA
1379 case Opt_usrjquota:
1380 qtype = USRQUOTA;
1381 goto set_qf_name;
1382 case Opt_grpjquota:
1383 qtype = GRPQUOTA;
1384set_qf_name:
17bd13b3 1385 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1386 !sbi->s_qf_names[qtype]) {
b31e1552
ES		 1387 ext4_msg(sb, KERN_ERR,
1388 "Cannot change journaled "
1389 "quota options when quota turned on");
ac27a0ec
DK		 1390 return 0;
1391 }
1392 qname = match_strdup(&args[0]);
1393 if (!qname) {
b31e1552
ES		 1394 ext4_msg(sb, KERN_ERR,
1395 "Not enough memory for "
1396 "storing quotafile name");
ac27a0ec
DK		 1397 return 0;
1398 }
1399 if (sbi->s_qf_names[qtype] &&
1400 strcmp(sbi->s_qf_names[qtype], qname)) {
b31e1552
ES		 1401 ext4_msg(sb, KERN_ERR,
1402 "%s quota file already "
1403 "specified", QTYPE2NAME(qtype));
ac27a0ec
DK		 1404 kfree(qname);
1405 return 0;
1406 }
1407 sbi->s_qf_names[qtype] = qname;
1408 if (strchr(sbi->s_qf_names[qtype], '/')) {
b31e1552
ES		 1409 ext4_msg(sb, KERN_ERR,
1410 "quotafile must be on "
1411 "filesystem root");
ac27a0ec
DK		 1412 kfree(sbi->s_qf_names[qtype]);
1413 sbi->s_qf_names[qtype] = NULL;
1414 return 0;
1415 }
1416 set_opt(sbi->s_mount_opt, QUOTA);
1417 break;
1418 case Opt_offusrjquota:
1419 qtype = USRQUOTA;
1420 goto clear_qf_name;
1421 case Opt_offgrpjquota:
1422 qtype = GRPQUOTA;
1423clear_qf_name:
17bd13b3 1424 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1425 sbi->s_qf_names[qtype]) {
b31e1552 1426 ext4_msg(sb, KERN_ERR, "Cannot change "
2c8be6b2 1427 "journaled quota options when "
b31e1552 1428 "quota turned on");
ac27a0ec
DK		 1429 return 0;
1430 }
1431 /*
1432 * The space will be released later when all options
1433 * are confirmed to be correct
1434 */
1435 sbi->s_qf_names[qtype] = NULL;
1436 break;
1437 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1438 qfmt = QFMT_VFS_OLD;
1439 goto set_qf_format;
ac27a0ec 1440 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1441 qfmt = QFMT_VFS_V0;
1442set_qf_format:
17bd13b3 1443 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1444 sbi->s_jquota_fmt != qfmt) {
b31e1552 1445 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1446 "journaled quota options when "
b31e1552 1447 "quota turned on");
dfc5d03f
JK		 1448 return 0;
1449 }
1450 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1451 break;
1452 case Opt_quota:
1453 case Opt_usrquota:
1454 set_opt(sbi->s_mount_opt, QUOTA);
1455 set_opt(sbi->s_mount_opt, USRQUOTA);
1456 break;
1457 case Opt_grpquota:
1458 set_opt(sbi->s_mount_opt, QUOTA);
1459 set_opt(sbi->s_mount_opt, GRPQUOTA);
1460 break;
1461 case Opt_noquota:
17bd13b3 1462 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1463 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1464 "options when quota turned on");
ac27a0ec
DK		 1465 return 0;
1466 }
1467 clear_opt(sbi->s_mount_opt, QUOTA);
1468 clear_opt(sbi->s_mount_opt, USRQUOTA);
1469 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1470 break;
1471#else
1472 case Opt_quota:
1473 case Opt_usrquota:
1474 case Opt_grpquota:
b31e1552
ES		 1475 ext4_msg(sb, KERN_ERR,
1476 "quota options not supported");
cd59e7b9 1477 break;
ac27a0ec
DK		 1478 case Opt_usrjquota:
1479 case Opt_grpjquota:
1480 case Opt_offusrjquota:
1481 case Opt_offgrpjquota:
1482 case Opt_jqfmt_vfsold:
1483 case Opt_jqfmt_vfsv0:
b31e1552
ES		 1484 ext4_msg(sb, KERN_ERR,
1485 "journaled quota options not supported");
ac27a0ec
DK		 1486 break;
1487 case Opt_noquota:
1488 break;
1489#endif
1490 case Opt_abort:
4ab2f15b 1491 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1492 break;
06705bff
TT		 1493 case Opt_nobarrier:
1494 clear_opt(sbi->s_mount_opt, BARRIER);
1495 break;
ac27a0ec 1496 case Opt_barrier:
06705bff
TT		 1497 if (match_int(&args[0], &option)) {
1498 set_opt(sbi->s_mount_opt, BARRIER);
1499 break;
1500 }
ac27a0ec
DK		 1501 if (option)
1502 set_opt(sbi->s_mount_opt, BARRIER);
1503 else
1504 clear_opt(sbi->s_mount_opt, BARRIER);
1505 break;
1506 case Opt_ignore:
1507 break;
1508 case Opt_resize:
1509 if (!is_remount) {
b31e1552
ES		 1510 ext4_msg(sb, KERN_ERR,
1511 "resize option only available "
1512 "for remount");
ac27a0ec
DK		 1513 return 0;
1514 }
1515 if (match_int(&args[0], &option) != 0)
1516 return 0;
1517 *n_blocks_count = option;
1518 break;
1519 case Opt_nobh:
1520 set_opt(sbi->s_mount_opt, NOBH);
1521 break;
1522 case Opt_bh:
1523 clear_opt(sbi->s_mount_opt, NOBH);
1524 break;
25ec56b5
JNC		 1525 case Opt_i_version:
1526 set_opt(sbi->s_mount_opt, I_VERSION);
1527 sb->s_flags |= MS_I_VERSION;
1528 break;
dd919b98
AK		 1529 case Opt_nodelalloc:
1530 clear_opt(sbi->s_mount_opt, DELALLOC);
1531 break;
c9de560d
AT		 1532 case Opt_stripe:
1533 if (match_int(&args[0], &option))
1534 return 0;
1535 if (option < 0)
1536 return 0;
1537 sbi->s_stripe = option;
1538 break;
64769240
AT		 1539 case Opt_delalloc:
1540 set_opt(sbi->s_mount_opt, DELALLOC);
1541 break;
6fd058f7
TT		 1542 case Opt_block_validity:
1543 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1544 break;
1545 case Opt_noblock_validity:
1546 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1547 break;
240799cd
TT		 1548 case Opt_inode_readahead_blks:
1549 if (match_int(&args[0], &option))
1550 return 0;
1551 if (option < 0 || option > (1 << 30))
1552 return 0;
f7c43950 1553 if (!is_power_of_2(option)) {
b31e1552
ES		 1554 ext4_msg(sb, KERN_ERR,
1555 "EXT4-fs: inode_readahead_blks"
1556 " must be a power of 2");
3197ebdb
TT		 1557 return 0;
1558 }
240799cd
TT		 1559 sbi->s_inode_readahead_blks = option;
1560 break;
b3881f74
TT		 1561 case Opt_journal_ioprio:
1562 if (match_int(&args[0], &option))
1563 return 0;
1564 if (option < 0 || option > 7)
1565 break;
1566 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1567 option);
1568 break;
06705bff
TT		 1569 case Opt_noauto_da_alloc:
1570 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1571 break;
afd4672d 1572 case Opt_auto_da_alloc:
06705bff
TT		 1573 if (match_int(&args[0], &option)) {
1574 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1575 break;
1576 }
afd4672d
TT		 1577 if (option)
1578 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1579 else
1580 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1581 break;
5328e635
ES		 1582 case Opt_discard:
1583 set_opt(sbi->s_mount_opt, DISCARD);
1584 break;
1585 case Opt_nodiscard:
1586 clear_opt(sbi->s_mount_opt, DISCARD);
1587 break;
ac27a0ec 1588 default:
b31e1552
ES		 1589 ext4_msg(sb, KERN_ERR,
1590 "Unrecognized mount option \"%s\" "
1591 "or missing value", p);
ac27a0ec
DK		 1592 return 0;
1593 }
1594 }
1595#ifdef CONFIG_QUOTA
1596 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1597 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1598 sbi->s_qf_names[USRQUOTA])
1599 clear_opt(sbi->s_mount_opt, USRQUOTA);
1600
617ba13b 1601 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1602 sbi->s_qf_names[GRPQUOTA])
1603 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1604
1605 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1606 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1607 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b 1608 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
b31e1552
ES		 1609 ext4_msg(sb, KERN_ERR, "old and new quota "
1610 "format mixing");
ac27a0ec
DK		 1611 return 0;
1612 }
1613
1614 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1615 ext4_msg(sb, KERN_ERR, "journaled quota format "
1616 "not specified");
ac27a0ec
DK		 1617 return 0;
1618 }
1619 } else {
1620 if (sbi->s_jquota_fmt) {
b31e1552 1621 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1622 "specified with no journaling "
b31e1552 1623 "enabled");
ac27a0ec
DK		 1624 return 0;
1625 }
1626 }
1627#endif
1628 return 1;
1629}
1630
617ba13b 1631static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1632 int read_only)
1633{
617ba13b 1634 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1635 int res = 0;
1636
617ba13b 1637 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1638 ext4_msg(sb, KERN_ERR, "revision level too high, "
1639 "forcing read-only mode");
ac27a0ec
DK		 1640 res = MS_RDONLY;
1641 }
1642 if (read_only)
1643 return res;
617ba13b 1644 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1645 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1646 "running e2fsck is recommended");
617ba13b 1647 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1648 ext4_msg(sb, KERN_WARNING,
1649 "warning: mounting fs with errors, "
1650 "running e2fsck is recommended");
ac27a0ec
DK		 1651 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1652 le16_to_cpu(es->s_mnt_count) >=
1653 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1654 ext4_msg(sb, KERN_WARNING,
1655 "warning: maximal mount count reached, "
1656 "running e2fsck is recommended");
ac27a0ec
DK		 1657 else if (le32_to_cpu(es->s_checkinterval) &&
1658 (le32_to_cpu(es->s_lastcheck) +
1659 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1660 ext4_msg(sb, KERN_WARNING,
1661 "warning: checktime reached, "
1662 "running e2fsck is recommended");
0b8e58a1 1663 if (!sbi->s_journal)
0390131b 1664 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1665 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1666 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1667 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1668 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1669 ext4_update_dynamic_rev(sb);
0390131b
FM		 1670 if (sbi->s_journal)
1671 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1672
e2d67052 1673 ext4_commit_super(sb, 1);
ac27a0ec 1674 if (test_opt(sb, DEBUG))
a9df9a49 1675 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
7f4520cc 1676 "bpg=%lu, ipg=%lu, mo=%04x]\n",
ac27a0ec
DK		 1677 sb->s_blocksize,
1678 sbi->s_groups_count,
617ba13b
MC		 1679 EXT4_BLOCKS_PER_GROUP(sb),
1680 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1681 sbi->s_mount_opt);
1682
ac27a0ec
DK		 1683 return res;
1684}
1685
772cb7c8
JS		 1686static int ext4_fill_flex_info(struct super_block *sb)
1687{
1688 struct ext4_sb_info *sbi = EXT4_SB(sb);
1689 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1690 ext4_group_t flex_group_count;
1691 ext4_group_t flex_group;
1692 int groups_per_flex = 0;
c5ca7c76 1693 size_t size;
772cb7c8
JS		 1694 int i;
1695
503358ae
TT		 1696 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1697 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1698
1699 if (groups_per_flex < 2) {
772cb7c8
JS		 1700 sbi->s_log_groups_per_flex = 0;
1701 return 1;
1702 }
1703
c62a11fd
FB		 1704 /* We allocate both existing and potentially added groups */
1705 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1706 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1707 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1708 size = flex_group_count * sizeof(struct flex_groups);
1709 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1710 if (sbi->s_flex_groups == NULL) {
1711 sbi->s_flex_groups = vmalloc(size);
1712 if (sbi->s_flex_groups)
1713 memset(sbi->s_flex_groups, 0, size);
1714 }
772cb7c8 1715 if (sbi->s_flex_groups == NULL) {
b31e1552
ES		 1716 ext4_msg(sb, KERN_ERR, "not enough memory for "
1717 "%u flex groups", flex_group_count);
772cb7c8
JS		 1718 goto failed;
1719 }
772cb7c8 1720
772cb7c8 1721 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1722 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1723
1724 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1725 atomic_add(ext4_free_inodes_count(sb, gdp),
1726 &sbi->s_flex_groups[flex_group].free_inodes);
1727 atomic_add(ext4_free_blks_count(sb, gdp),
1728 &sbi->s_flex_groups[flex_group].free_blocks);
1729 atomic_add(ext4_used_dirs_count(sb, gdp),
1730 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1731 }
1732
1733 return 1;
1734failed:
1735 return 0;
1736}
1737
717d50e4
AD		 1738__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1739 struct ext4_group_desc *gdp)
1740{
1741 __u16 crc = 0;
1742
1743 if (sbi->s_es->s_feature_ro_compat &
1744 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1745 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1746 __le32 le_group = cpu_to_le32(block_group);
1747
1748 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1749 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1750 crc = crc16(crc, (__u8 *)gdp, offset);
1751 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1752 /* for checksum of struct ext4_group_desc do the rest...*/
1753 if ((sbi->s_es->s_feature_incompat &
1754 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1755 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1756 crc = crc16(crc, (__u8 *)gdp + offset,
1757 le16_to_cpu(sbi->s_es->s_desc_size) -
1758 offset);
1759 }
1760
1761 return cpu_to_le16(crc);
1762}
1763
1764int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1765 struct ext4_group_desc *gdp)
1766{
1767 if ((sbi->s_es->s_feature_ro_compat &
1768 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1769 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1770 return 0;
1771
1772 return 1;
1773}
1774
ac27a0ec 1775/* Called at mount-time, super-block is locked */
197cd65a 1776static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1777{
617ba13b
MC		 1778 struct ext4_sb_info *sbi = EXT4_SB(sb);
1779 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1780 ext4_fsblk_t last_block;
bd81d8ee
LV		 1781 ext4_fsblk_t block_bitmap;
1782 ext4_fsblk_t inode_bitmap;
1783 ext4_fsblk_t inode_table;
ce421581 1784 int flexbg_flag = 0;
fd2d4291 1785 ext4_group_t i;
ac27a0ec 1786
ce421581
JS		 1787 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1788 flexbg_flag = 1;
1789
af5bc92d 1790 ext4_debug("Checking group descriptors");
ac27a0ec 1791
197cd65a
AM		 1792 for (i = 0; i < sbi->s_groups_count; i++) {
1793 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1794
ce421581 1795 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1796 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1797 else
1798 last_block = first_block +
617ba13b 1799 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1800
8fadc143 1801 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1802 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1803 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1804 "Block bitmap for group %u not in group "
b31e1552 1805 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1806 return 0;
1807 }
8fadc143 1808 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1809 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1810 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1811 "Inode bitmap for group %u not in group "
b31e1552 1812 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1813 return 0;
1814 }
8fadc143 1815 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1816 if (inode_table < first_block ||
2b2d6d01 1817 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1818 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1819 "Inode table for group %u not in group "
b31e1552 1820 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1821 return 0;
1822 }
955ce5f5 1823 ext4_lock_group(sb, i);
717d50e4 1824 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1825 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1826 "Checksum for group %u failed (%u!=%u)",
1827 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1828 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1829 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1830 ext4_unlock_group(sb, i);
8a266467 1831 return 0;
7ee1ec4c 1832 }
717d50e4 1833 }
955ce5f5 1834 ext4_unlock_group(sb, i);
ce421581
JS		 1835 if (!flexbg_flag)
1836 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1837 }
1838
bd81d8ee 1839 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 1840 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1841 return 1;
1842}
1843
617ba13b 1844/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1845 * the superblock) which were deleted from all directories, but held open by
1846 * a process at the time of a crash. We walk the list and try to delete these
1847 * inodes at recovery time (only with a read-write filesystem).
1848 *
1849 * In order to keep the orphan inode chain consistent during traversal (in
1850 * case of crash during recovery), we link each inode into the superblock
1851 * orphan list_head and handle it the same way as an inode deletion during
1852 * normal operation (which journals the operations for us).
1853 *
1854 * We only do an iget() and an iput() on each inode, which is very safe if we
1855 * accidentally point at an in-use or already deleted inode. The worst that
1856 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1857 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1858 * e2fsck was run on this filesystem, and it must have already done the orphan
1859 * inode cleanup for us, so we can safely abort without any further action.
1860 */
2b2d6d01
TT		 1861static void ext4_orphan_cleanup(struct super_block *sb,
1862 struct ext4_super_block *es)
ac27a0ec
DK		 1863{
1864 unsigned int s_flags = sb->s_flags;
1865 int nr_orphans = 0, nr_truncates = 0;
1866#ifdef CONFIG_QUOTA
1867 int i;
1868#endif
1869 if (!es->s_last_orphan) {
1870 jbd_debug(4, "no orphan inodes to clean up\n");
1871 return;
1872 }
1873
a8f48a95 1874 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 1875 ext4_msg(sb, KERN_ERR, "write access "
1876 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 1877 return;
1878 }
1879
617ba13b 1880 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1881 if (es->s_last_orphan)
1882 jbd_debug(1, "Errors on filesystem, "
1883 "clearing orphan list.\n");
1884 es->s_last_orphan = 0;
1885 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1886 return;
1887 }
1888
1889 if (s_flags & MS_RDONLY) {
b31e1552 1890 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 1891 sb->s_flags &= ~MS_RDONLY;
1892 }
1893#ifdef CONFIG_QUOTA
1894 /* Needed for iput() to work correctly and not trash data */
1895 sb->s_flags |= MS_ACTIVE;
1896 /* Turn on quotas so that they are updated correctly */
1897 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1898 if (EXT4_SB(sb)->s_qf_names[i]) {
1899 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 1900 if (ret < 0)
b31e1552
ES		 1901 ext4_msg(sb, KERN_ERR,
1902 "Cannot turn on journaled "
1903 "quota: error %d", ret);
ac27a0ec
DK		 1904 }
1905 }
1906#endif
1907
1908 while (es->s_last_orphan) {
1909 struct inode *inode;
1910
97bd42b9
JB		 1911 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1912 if (IS_ERR(inode)) {
ac27a0ec
DK		 1913 es->s_last_orphan = 0;
1914 break;
1915 }
1916
617ba13b 1917 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
a269eb18 1918 vfs_dq_init(inode);
ac27a0ec 1919 if (inode->i_nlink) {
b31e1552
ES		 1920 ext4_msg(sb, KERN_DEBUG,
1921 "%s: truncating inode %lu to %lld bytes",
46e665e9 1922 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1923 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1924 inode->i_ino, inode->i_size);
617ba13b 1925 ext4_truncate(inode);
ac27a0ec
DK		 1926 nr_truncates++;
1927 } else {
b31e1552
ES		 1928 ext4_msg(sb, KERN_DEBUG,
1929 "%s: deleting unreferenced inode %lu",
46e665e9 1930 __func__, inode->i_ino);
ac27a0ec
DK		 1931 jbd_debug(2, "deleting unreferenced inode %lu\n",
1932 inode->i_ino);
1933 nr_orphans++;
1934 }
1935 iput(inode); /* The delete magic happens here! */
1936 }
1937
2b2d6d01 1938#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1939
1940 if (nr_orphans)
b31e1552
ES		 1941 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1942 PLURAL(nr_orphans));
ac27a0ec 1943 if (nr_truncates)
b31e1552
ES		 1944 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1945 PLURAL(nr_truncates));
ac27a0ec
DK		 1946#ifdef CONFIG_QUOTA
1947 /* Turn quotas off */
1948 for (i = 0; i < MAXQUOTAS; i++) {
1949 if (sb_dqopt(sb)->files[i])
6f28e087 1950 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1951 }
1952#endif
1953 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1954}
0b8e58a1 1955
cd2291a4
ES		 1956/*
1957 * Maximal extent format file size.
1958 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1959 * extent format containers, within a sector_t, and within i_blocks
1960 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1961 * so that won't be a limiting factor.
1962 *
1963 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1964 */
f287a1a5 1965static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1966{
1967 loff_t res;
1968 loff_t upper_limit = MAX_LFS_FILESIZE;
1969
1970 /* small i_blocks in vfs inode? */
f287a1a5 1971 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 1972 /*
90c699a9 1973 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 1974 * i_block represent total blocks in 512 bytes
1975 * 32 == size of vfs inode i_blocks * 8
1976 */
1977 upper_limit = (1LL << 32) - 1;
1978
1979 /* total blocks in file system block size */
1980 upper_limit >>= (blkbits - 9);
1981 upper_limit <<= blkbits;
1982 }
1983
1984 /* 32-bit extent-start container, ee_block */
1985 res = 1LL << 32;
1986 res <<= blkbits;
1987 res -= 1;
1988
1989 /* Sanity check against vm- & vfs- imposed limits */
1990 if (res > upper_limit)
1991 res = upper_limit;
1992
1993 return res;
1994}
ac27a0ec 1995
ac27a0ec 1996/*
cd2291a4 1997 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1998 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1999 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2000 */
f287a1a5 2001static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2002{
617ba13b 2003 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2004 int meta_blocks;
2005 loff_t upper_limit;
0b8e58a1
AD		 2006 /* This is calculated to be the largest file size for a dense, block
2007 * mapped file such that the file's total number of 512-byte sectors,
2008 * including data and all indirect blocks, does not exceed (2^48 - 1).
2009 *
2010 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2011 * number of 512-byte sectors of the file.
0fc1b451
AK		 2012 */
2013
f287a1a5 2014 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2015 /*
90c699a9 2016 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2017 * the inode i_block field represents total file blocks in
2018 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2019 */
2020 upper_limit = (1LL << 32) - 1;
2021
2022 /* total blocks in file system block size */
2023 upper_limit >>= (bits - 9);
2024
2025 } else {
8180a562
AK		 2026 /*
2027 * We use 48 bit ext4_inode i_blocks
2028 * With EXT4_HUGE_FILE_FL set the i_blocks
2029 * represent total number of blocks in
2030 * file system block size
2031 */
0fc1b451
AK		 2032 upper_limit = (1LL << 48) - 1;
2033
0fc1b451
AK		 2034 }
2035
2036 /* indirect blocks */
2037 meta_blocks = 1;
2038 /* double indirect blocks */
2039 meta_blocks += 1 + (1LL << (bits-2));
2040 /* tripple indirect blocks */
2041 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2042
2043 upper_limit -= meta_blocks;
2044 upper_limit <<= bits;
ac27a0ec
DK		 2045
2046 res += 1LL << (bits-2);
2047 res += 1LL << (2*(bits-2));
2048 res += 1LL << (3*(bits-2));
2049 res <<= bits;
2050 if (res > upper_limit)
2051 res = upper_limit;
0fc1b451
AK		 2052
2053 if (res > MAX_LFS_FILESIZE)
2054 res = MAX_LFS_FILESIZE;
2055
ac27a0ec
DK		 2056 return res;
2057}
2058
617ba13b 2059static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2060 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2061{
617ba13b 2062 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2063 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2064 int has_super = 0;
2065
2066 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2067
617ba13b 2068 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2069 nr < first_meta_bg)
70bbb3e0 2070 return logical_sb_block + nr + 1;
ac27a0ec 2071 bg = sbi->s_desc_per_block * nr;
617ba13b 2072 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2073 has_super = 1;
0b8e58a1 2074
617ba13b 2075 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2076}
2077
c9de560d
AT		 2078/**
2079 * ext4_get_stripe_size: Get the stripe size.
2080 * @sbi: In memory super block info
2081 *
2082 * If we have specified it via mount option, then
2083 * use the mount option value. If the value specified at mount time is
2084 * greater than the blocks per group use the super block value.
2085 * If the super block value is greater than blocks per group return 0.
2086 * Allocator needs it be less than blocks per group.
2087 *
2088 */
2089static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2090{
2091 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2092 unsigned long stripe_width =
2093 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2094
2095 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2096 return sbi->s_stripe;
2097
2098 if (stripe_width <= sbi->s_blocks_per_group)
2099 return stripe_width;
2100
2101 if (stride <= sbi->s_blocks_per_group)
2102 return stride;
2103
2104 return 0;
2105}
ac27a0ec 2106
3197ebdb
TT		 2107/* sysfs supprt */
2108
2109struct ext4_attr {
2110 struct attribute attr;
2111 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2112 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2113 const char *, size_t);
2114 int offset;
2115};
2116
2117static int parse_strtoul(const char *buf,
2118 unsigned long max, unsigned long *value)
2119{
2120 char *endp;
2121
2122 while (*buf && isspace(*buf))
2123 buf++;
2124 *value = simple_strtoul(buf, &endp, 0);
2125 while (*endp && isspace(*endp))
2126 endp++;
2127 if (*endp || *value > max)
2128 return -EINVAL;
2129
2130 return 0;
2131}
2132
2133static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2134 struct ext4_sb_info *sbi,
2135 char *buf)
2136{
2137 return snprintf(buf, PAGE_SIZE, "%llu\n",
2138 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2139}
2140
2141static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2142 struct ext4_sb_info *sbi, char *buf)
2143{
2144 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2145
2146 return snprintf(buf, PAGE_SIZE, "%lu\n",
2147 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2148 sbi->s_sectors_written_start) >> 1);
2149}
2150
2151static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2152 struct ext4_sb_info *sbi, char *buf)
2153{
2154 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2155
2156 return snprintf(buf, PAGE_SIZE, "%llu\n",
2157 sbi->s_kbytes_written +
2158 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2159 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2160}
2161
2162static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2163 struct ext4_sb_info *sbi,
2164 const char *buf, size_t count)
2165{
2166 unsigned long t;
2167
2168 if (parse_strtoul(buf, 0x40000000, &t))
2169 return -EINVAL;
2170
f7c43950 2171 if (!is_power_of_2(t))
3197ebdb
TT		 2172 return -EINVAL;
2173
2174 sbi->s_inode_readahead_blks = t;
2175 return count;
2176}
2177
2178static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2179 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2180{
2181 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2182
2183 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2184}
2185
2186static ssize_t sbi_ui_store(struct ext4_attr *a,
2187 struct ext4_sb_info *sbi,
2188 const char *buf, size_t count)
2189{
2190 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2191 unsigned long t;
2192
2193 if (parse_strtoul(buf, 0xffffffff, &t))
2194 return -EINVAL;
2195 *ui = t;
2196 return count;
2197}
2198
2199#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2200static struct ext4_attr ext4_attr_##_name = { \
2201 .attr = {.name = __stringify(_name), .mode = _mode }, \
2202 .show = _show, \
2203 .store = _store, \
2204 .offset = offsetof(struct ext4_sb_info, _elname), \
2205}
2206#define EXT4_ATTR(name, mode, show, store) \
2207static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2208
2209#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2210#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2211#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2212 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2213#define ATTR_LIST(name) &ext4_attr_##name.attr
2214
2215EXT4_RO_ATTR(delayed_allocation_blocks);
2216EXT4_RO_ATTR(session_write_kbytes);
2217EXT4_RO_ATTR(lifetime_write_kbytes);
2218EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2219 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2220EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2221EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2222EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2223EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2224EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2225EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2226EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2227EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2228
2229static struct attribute *ext4_attrs[] = {
2230 ATTR_LIST(delayed_allocation_blocks),
2231 ATTR_LIST(session_write_kbytes),
2232 ATTR_LIST(lifetime_write_kbytes),
2233 ATTR_LIST(inode_readahead_blks),
11013911 2234 ATTR_LIST(inode_goal),
3197ebdb
TT		 2235 ATTR_LIST(mb_stats),
2236 ATTR_LIST(mb_max_to_scan),
2237 ATTR_LIST(mb_min_to_scan),
2238 ATTR_LIST(mb_order2_req),
2239 ATTR_LIST(mb_stream_req),
2240 ATTR_LIST(mb_group_prealloc),
55138e0b 2241 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2242 NULL,
2243};
2244
2245static ssize_t ext4_attr_show(struct kobject *kobj,
2246 struct attribute *attr, char *buf)
2247{
2248 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2249 s_kobj);
2250 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2251
2252 return a->show ? a->show(a, sbi, buf) : 0;
2253}
2254
2255static ssize_t ext4_attr_store(struct kobject *kobj,
2256 struct attribute *attr,
2257 const char *buf, size_t len)
2258{
2259 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2260 s_kobj);
2261 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2262
2263 return a->store ? a->store(a, sbi, buf, len) : 0;
2264}
2265
2266static void ext4_sb_release(struct kobject *kobj)
2267{
2268 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2269 s_kobj);
2270 complete(&sbi->s_kobj_unregister);
2271}
2272
2273
2274static struct sysfs_ops ext4_attr_ops = {
2275 .show = ext4_attr_show,
2276 .store = ext4_attr_store,
2277};
2278
2279static struct kobj_type ext4_ktype = {
2280 .default_attrs = ext4_attrs,
2281 .sysfs_ops = &ext4_attr_ops,
2282 .release = ext4_sb_release,
2283};
2284
a13fb1a4
ES		 2285/*
2286 * Check whether this filesystem can be mounted based on
2287 * the features present and the RDONLY/RDWR mount requested.
2288 * Returns 1 if this filesystem can be mounted as requested,
2289 * 0 if it cannot be.
2290 */
2291static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2292{
2293 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2294 ext4_msg(sb, KERN_ERR,
2295 "Couldn't mount because of "
2296 "unsupported optional features (%x)",
2297 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2298 ~EXT4_FEATURE_INCOMPAT_SUPP));
2299 return 0;
2300 }
2301
2302 if (readonly)
2303 return 1;
2304
2305 /* Check that feature set is OK for a read-write mount */
2306 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2307 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2308 "unsupported optional features (%x)",
2309 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2310 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2311 return 0;
2312 }
2313 /*
2314 * Large file size enabled file system can only be mounted
2315 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2316 */
2317 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2318 if (sizeof(blkcnt_t) < sizeof(u64)) {
2319 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2320 "cannot be mounted RDWR without "
2321 "CONFIG_LBDAF");
2322 return 0;
2323 }
2324 }
2325 return 1;
2326}
2327
2b2d6d01 2328static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2329 __releases(kernel_lock)
2330 __acquires(kernel_lock)
ac27a0ec 2331{
2b2d6d01 2332 struct buffer_head *bh;
617ba13b
MC		 2333 struct ext4_super_block *es = NULL;
2334 struct ext4_sb_info *sbi;
2335 ext4_fsblk_t block;
2336 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2337 ext4_fsblk_t logical_sb_block;
ac27a0ec 2338 unsigned long offset = 0;
ac27a0ec
DK		 2339 unsigned long journal_devnum = 0;
2340 unsigned long def_mount_opts;
2341 struct inode *root;
9f6200bb 2342 char *cp;
0390131b 2343 const char *descr;
1d1fe1ee 2344 int ret = -EINVAL;
ac27a0ec 2345 int blocksize;
4ec11028
TT		 2346 unsigned int db_count;
2347 unsigned int i;
f287a1a5 2348 int needs_recovery, has_huge_files;
bd81d8ee 2349 __u64 blocks_count;
833f4077 2350 int err;
b3881f74 2351 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2352
2353 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2354 if (!sbi)
2355 return -ENOMEM;
705895b6
PE		 2356
2357 sbi->s_blockgroup_lock =
2358 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2359 if (!sbi->s_blockgroup_lock) {
2360 kfree(sbi);
2361 return -ENOMEM;
2362 }
ac27a0ec
DK		 2363 sb->s_fs_info = sbi;
2364 sbi->s_mount_opt = 0;
617ba13b
MC		 2365 sbi->s_resuid = EXT4_DEF_RESUID;
2366 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2367 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2368 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2369 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2370 sectors[1]);
ac27a0ec
DK		 2371
2372 unlock_kernel();
2373
9f6200bb
TT		 2374 /* Cleanup superblock name */
2375 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2376 *cp = '!';
2377
617ba13b 2378 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2379 if (!blocksize) {
b31e1552 2380 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2381 goto out_fail;
2382 }
2383
2384 /*
617ba13b 2385 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2386 * block sizes. We need to calculate the offset from buffer start.
2387 */
617ba13b 2388 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2389 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2390 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2391 } else {
70bbb3e0 2392 logical_sb_block = sb_block;
ac27a0ec
DK		 2393 }
2394
70bbb3e0 2395 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 2396 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 2397 goto out_fail;
2398 }
2399 /*
2400 * Note: s_es must be initialized as soon as possible because
617ba13b 2401 * some ext4 macro-instructions depend on its value
ac27a0ec 2402 */
617ba13b 2403 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2404 sbi->s_es = es;
2405 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2406 if (sb->s_magic != EXT4_SUPER_MAGIC)
2407 goto cantfind_ext4;
afc32f7e 2408 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2409
2410 /* Set defaults before we parse the mount options */
2411 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2412 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2413 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2414 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2415 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2416 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2417 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2418#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2419 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2420 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2421#endif
03010a33 2422#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2423 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2424 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2425#endif
617ba13b
MC		 2426 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2427 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2428 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2429 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2430 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2431 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2432
2433 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2434 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2435 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2436 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2437 else
2438 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2439
2440 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2441 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2442 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2443 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2444 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2445
571640ca 2446 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2447
dd919b98
AK		 2448 /*
2449 * enable delayed allocation by default
2450 * Use -o nodelalloc to turn it off
2451 */
2452 set_opt(sbi->s_mount_opt, DELALLOC);
2453
b3881f74
TT		 2454 if (!parse_options((char *) data, sb, &journal_devnum,
2455 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2456 goto failed_mount;
2457
2458 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2459 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2460
617ba13b
MC		 2461 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2462 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2463 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2464 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 2465 ext4_msg(sb, KERN_WARNING,
2466 "feature flags set on rev 0 fs, "
2467 "running e2fsck is recommended");
469108ff 2468
ac27a0ec
DK		 2469 /*
2470 * Check feature flags regardless of the revision level, since we
2471 * previously didn't change the revision level when setting the flags,
2472 * so there is a chance incompat flags are set on a rev 0 filesystem.
2473 */
a13fb1a4 2474 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 2475 goto failed_mount;
a13fb1a4 2476
ac27a0ec
DK		 2477 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2478
617ba13b
MC		 2479 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2480 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 2481 ext4_msg(sb, KERN_ERR,
2482 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 2483 goto failed_mount;
2484 }
2485
ac27a0ec 2486 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2487 /* Validate the filesystem blocksize */
2488 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 2489 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 2490 blocksize);
ac27a0ec
DK		 2491 goto failed_mount;
2492 }
2493
2b2d6d01 2494 brelse(bh);
70bbb3e0
AM		 2495 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2496 offset = do_div(logical_sb_block, blocksize);
2497 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 2498 if (!bh) {
b31e1552
ES		 2499 ext4_msg(sb, KERN_ERR,
2500 "Can't read superblock on 2nd try");
ac27a0ec
DK		 2501 goto failed_mount;
2502 }
617ba13b 2503 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2504 sbi->s_es = es;
617ba13b 2505 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 2506 ext4_msg(sb, KERN_ERR,
2507 "Magic mismatch, very weird!");
ac27a0ec
DK		 2508 goto failed_mount;
2509 }
2510 }
2511
a13fb1a4
ES		 2512 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2513 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 2514 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2515 has_huge_files);
2516 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2517
617ba13b
MC		 2518 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2519 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2520 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2521 } else {
2522 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2523 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2524 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2525 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2526 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 2527 ext4_msg(sb, KERN_ERR,
2528 "unsupported inode size: %d",
2b2d6d01 2529 sbi->s_inode_size);
ac27a0ec
DK		 2530 goto failed_mount;
2531 }
ef7f3835
KS		 2532 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2533 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2534 }
0b8e58a1 2535
0d1ee42f
AR		 2536 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2537 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2538 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2539 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2540 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 2541 ext4_msg(sb, KERN_ERR,
2542 "unsupported descriptor size %lu",
0d1ee42f
AR		 2543 sbi->s_desc_size);
2544 goto failed_mount;
2545 }
2546 } else
2547 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 2548
ac27a0ec 2549 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2550 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2551 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 2552 goto cantfind_ext4;
0b8e58a1 2553
617ba13b 2554 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2555 if (sbi->s_inodes_per_block == 0)
617ba13b 2556 goto cantfind_ext4;
ac27a0ec
DK		 2557 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2558 sbi->s_inodes_per_block;
0d1ee42f 2559 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2560 sbi->s_sbh = bh;
2561 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2562 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2563 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 2564
2b2d6d01 2565 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2566 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2567 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2568 i = le32_to_cpu(es->s_flags);
2569 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2570 sbi->s_hash_unsigned = 3;
2571 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2572#ifdef __CHAR_UNSIGNED__
2573 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2574 sbi->s_hash_unsigned = 3;
2575#else
2576 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2577#endif
2578 sb->s_dirt = 1;
2579 }
ac27a0ec
DK		 2580
2581 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 2582 ext4_msg(sb, KERN_ERR,
2583 "#blocks per group too big: %lu",
2b2d6d01 2584 sbi->s_blocks_per_group);
ac27a0ec
DK		 2585 goto failed_mount;
2586 }
ac27a0ec 2587 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 2588 ext4_msg(sb, KERN_ERR,
2589 "#inodes per group too big: %lu",
2b2d6d01 2590 sbi->s_inodes_per_group);
ac27a0ec
DK		 2591 goto failed_mount;
2592 }
2593
bf43d84b
ES		 2594 /*
2595 * Test whether we have more sectors than will fit in sector_t,
2596 * and whether the max offset is addressable by the page cache.
2597 */
2598 if ((ext4_blocks_count(es) >
2599 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2600 (ext4_blocks_count(es) >
2601 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
b31e1552 2602 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 2603 " too large to mount safely on this system");
ac27a0ec 2604 if (sizeof(sector_t) < 8)
90c699a9 2605 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
bf43d84b 2606 ret = -EFBIG;
ac27a0ec
DK		 2607 goto failed_mount;
2608 }
2609
617ba13b
MC		 2610 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2611 goto cantfind_ext4;
e7c95593 2612
0f2ddca6
FTN		 2613 /* check blocks count against device size */
2614 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2615 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 2616 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2617 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 2618 ext4_blocks_count(es), blocks_count);
2619 goto failed_mount;
2620 }
2621
0b8e58a1
AD		 2622 /*
2623 * It makes no sense for the first data block to be beyond the end
2624 * of the filesystem.
2625 */
2626 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 2627 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2628 "block %u is beyond end of filesystem (%llu)",
2629 le32_to_cpu(es->s_first_data_block),
2630 ext4_blocks_count(es));
e7c95593
ES		 2631 goto failed_mount;
2632 }
bd81d8ee
LV		 2633 blocks_count = (ext4_blocks_count(es) -
2634 le32_to_cpu(es->s_first_data_block) +
2635 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2636 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 2637 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 2638 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 2639 "(block count %llu, first data block %u, "
b31e1552 2640 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 2641 ext4_blocks_count(es),
2642 le32_to_cpu(es->s_first_data_block),
2643 EXT4_BLOCKS_PER_GROUP(sb));
2644 goto failed_mount;
2645 }
bd81d8ee 2646 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 2647 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2648 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 2649 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2650 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2651 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2652 GFP_KERNEL);
2653 if (sbi->s_group_desc == NULL) {
b31e1552 2654 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 2655 goto failed_mount;
2656 }
2657
3244fcb1 2658#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2659 if (ext4_proc_root)
2660 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2661#endif
240799cd 2662
705895b6 2663 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2664
2665 for (i = 0; i < db_count; i++) {
70bbb3e0 2666 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2667 sbi->s_group_desc[i] = sb_bread(sb, block);
2668 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 2669 ext4_msg(sb, KERN_ERR,
2670 "can't read group descriptor %d", i);
ac27a0ec
DK		 2671 db_count = i;
2672 goto failed_mount2;
2673 }
2674 }
2b2d6d01 2675 if (!ext4_check_descriptors(sb)) {
b31e1552 2676 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 2677 goto failed_mount2;
2678 }
772cb7c8
JS		 2679 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2680 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 2681 ext4_msg(sb, KERN_ERR,
2682 "unable to initialize "
2683 "flex_bg meta info!");
772cb7c8
JS		 2684 goto failed_mount2;
2685 }
2686
ac27a0ec
DK		 2687 sbi->s_gdb_count = db_count;
2688 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2689 spin_lock_init(&sbi->s_next_gen_lock);
2690
833f4077
PZ		 2691 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2692 ext4_count_free_blocks(sb));
2693 if (!err) {
2694 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2695 ext4_count_free_inodes(sb));
2696 }
2697 if (!err) {
2698 err = percpu_counter_init(&sbi->s_dirs_counter,
2699 ext4_count_dirs(sb));
2700 }
6bc6e63f
AK		 2701 if (!err) {
2702 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2703 }
833f4077 2704 if (err) {
b31e1552 2705 ext4_msg(sb, KERN_ERR, "insufficient memory");
833f4077
PZ		 2706 goto failed_mount3;
2707 }
ac27a0ec 2708
c9de560d 2709 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 2710 sbi->s_max_writeback_mb_bump = 128;
c9de560d 2711
ac27a0ec
DK		 2712 /*
2713 * set up enough so that it can read an inode
2714 */
9ca92389
TT		 2715 if (!test_opt(sb, NOLOAD) &&
2716 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2717 sb->s_op = &ext4_sops;
2718 else
2719 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2720 sb->s_export_op = &ext4_export_ops;
2721 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2722#ifdef CONFIG_QUOTA
617ba13b
MC		 2723 sb->s_qcop = &ext4_qctl_operations;
2724 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2725#endif
2726 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2727 mutex_init(&sbi->s_orphan_lock);
32ed5058 2728 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2729
2730 sb->s_root = NULL;
2731
2732 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2733 EXT4_HAS_INCOMPAT_FEATURE(sb,
2734 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2735
2736 /*
2737 * The first inode we look at is the journal inode. Don't try
2738 * root first: it may be modified in the journal!
2739 */
2740 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2741 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2742 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2743 goto failed_mount3;
0390131b
FM		 2744 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2745 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 2746 ext4_msg(sb, KERN_ERR, "required journal recovery "
2747 "suppressed and not mounted read-only");
0390131b 2748 goto failed_mount4;
ac27a0ec 2749 } else {
0390131b
FM		 2750 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2751 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2752 sbi->s_journal = NULL;
2753 needs_recovery = 0;
2754 goto no_journal;
ac27a0ec
DK		 2755 }
2756
eb40a09c
JS		 2757 if (ext4_blocks_count(es) > 0xffffffffULL &&
2758 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2759 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 2760 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
eb40a09c
JS		 2761 goto failed_mount4;
2762 }
2763
d4da6c9c
LT		 2764 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2765 jbd2_journal_set_features(sbi->s_journal,
2766 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 2767 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2768 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2769 jbd2_journal_set_features(sbi->s_journal,
2770 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 2771 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2772 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2773 } else {
2774 jbd2_journal_clear_features(sbi->s_journal,
2775 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2776 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2777 }
818d276c 2778
ac27a0ec
DK		 2779 /* We have now updated the journal if required, so we can
2780 * validate the data journaling mode. */
2781 switch (test_opt(sb, DATA_FLAGS)) {
2782 case 0:
2783 /* No mode set, assume a default based on the journal
63f57933
AM		 2784 * capabilities: ORDERED_DATA if the journal can
2785 * cope, else JOURNAL_DATA
2786 */
dab291af
MC		 2787 if (jbd2_journal_check_available_features
2788 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2789 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2790 else
2791 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2792 break;
2793
617ba13b
MC		 2794 case EXT4_MOUNT_ORDERED_DATA:
2795 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2796 if (!jbd2_journal_check_available_features
2797 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 2798 ext4_msg(sb, KERN_ERR, "Journal does not support "
2799 "requested data journaling mode");
ac27a0ec
DK		 2800 goto failed_mount4;
2801 }
2802 default:
2803 break;
2804 }
b3881f74 2805 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2806
0390131b 2807no_journal:
ac27a0ec
DK		 2808
2809 if (test_opt(sb, NOBH)) {
617ba13b 2810 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
b31e1552
ES		 2811 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2812 "its supported only with writeback mode");
ac27a0ec
DK		 2813 clear_opt(sbi->s_mount_opt, NOBH);
2814 }
2815 }
4c0425ff
MC		 2816 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2817 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2818 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2819 goto failed_mount_wq;
2820 }
2821
ac27a0ec 2822 /*
dab291af 2823 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2824 * so we can safely mount the rest of the filesystem now.
2825 */
2826
1d1fe1ee
DH		 2827 root = ext4_iget(sb, EXT4_ROOT_INO);
2828 if (IS_ERR(root)) {
b31e1552 2829 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 2830 ret = PTR_ERR(root);
ac27a0ec
DK		 2831 goto failed_mount4;
2832 }
2833 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2834 iput(root);
b31e1552 2835 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 2836 goto failed_mount4;
2837 }
1d1fe1ee
DH		 2838 sb->s_root = d_alloc_root(root);
2839 if (!sb->s_root) {
b31e1552 2840 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 2841 iput(root);
2842 ret = -ENOMEM;
2843 goto failed_mount4;
2844 }
ac27a0ec 2845
2b2d6d01 2846 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2847
2848 /* determine the minimum size of new large inodes, if present */
2849 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2850 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2851 EXT4_GOOD_OLD_INODE_SIZE;
2852 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2853 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2854 if (sbi->s_want_extra_isize <
2855 le16_to_cpu(es->s_want_extra_isize))
2856 sbi->s_want_extra_isize =
2857 le16_to_cpu(es->s_want_extra_isize);
2858 if (sbi->s_want_extra_isize <
2859 le16_to_cpu(es->s_min_extra_isize))
2860 sbi->s_want_extra_isize =
2861 le16_to_cpu(es->s_min_extra_isize);
2862 }
2863 }
2864 /* Check if enough inode space is available */
2865 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2866 sbi->s_inode_size) {
2867 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2868 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 2869 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2870 "available");
ef7f3835
KS		 2871 }
2872
90576c0b
TT		 2873 if (test_opt(sb, DELALLOC) &&
2874 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 2875 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2876 "requested data journaling mode");
c2774d84 2877 clear_opt(sbi->s_mount_opt, DELALLOC);
90576c0b 2878 }
c2774d84 2879
6fd058f7
TT		 2880 err = ext4_setup_system_zone(sb);
2881 if (err) {
b31e1552
ES		 2882 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2883 "zone (%d)\n", err);
6fd058f7
TT		 2884 goto failed_mount4;
2885 }
2886
c2774d84
AK		 2887 ext4_ext_init(sb);
2888 err = ext4_mb_init(sb, needs_recovery);
2889 if (err) {
b31e1552
ES		 2890 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2891 err);
c2774d84
AK		 2892 goto failed_mount4;
2893 }
2894
3197ebdb
TT		 2895 sbi->s_kobj.kset = ext4_kset;
2896 init_completion(&sbi->s_kobj_unregister);
2897 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2898 "%s", sb->s_id);
2899 if (err) {
2900 ext4_mb_release(sb);
2901 ext4_ext_release(sb);
2902 goto failed_mount4;
2903 };
2904
617ba13b
MC		 2905 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2906 ext4_orphan_cleanup(sb, es);
2907 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2908 if (needs_recovery) {
b31e1552 2909 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 2910 ext4_mark_recovery_complete(sb, es);
2911 }
2912 if (EXT4_SB(sb)->s_journal) {
2913 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2914 descr = " journalled data mode";
2915 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2916 descr = " ordered data mode";
2917 else
2918 descr = " writeback data mode";
2919 } else
2920 descr = "out journal";
2921
b31e1552 2922 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
ac27a0ec
DK		 2923
2924 lock_kernel();
2925 return 0;
2926
617ba13b 2927cantfind_ext4:
ac27a0ec 2928 if (!silent)
b31e1552 2929 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 2930 goto failed_mount;
2931
2932failed_mount4:
b31e1552 2933 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 2934 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2935failed_mount_wq:
6fd058f7 2936 ext4_release_system_zone(sb);
0390131b
FM		 2937 if (sbi->s_journal) {
2938 jbd2_journal_destroy(sbi->s_journal);
2939 sbi->s_journal = NULL;
2940 }
ac27a0ec 2941failed_mount3:
c5ca7c76
TT		 2942 if (sbi->s_flex_groups) {
2943 if (is_vmalloc_addr(sbi->s_flex_groups))
2944 vfree(sbi->s_flex_groups);
2945 else
2946 kfree(sbi->s_flex_groups);
2947 }
ac27a0ec
DK		 2948 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2949 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2950 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2951 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2952failed_mount2:
2953 for (i = 0; i < db_count; i++)
2954 brelse(sbi->s_group_desc[i]);
2955 kfree(sbi->s_group_desc);
2956failed_mount:
240799cd 2957 if (sbi->s_proc) {
9f6200bb 2958 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2959 }
ac27a0ec
DK		 2960#ifdef CONFIG_QUOTA
2961 for (i = 0; i < MAXQUOTAS; i++)
2962 kfree(sbi->s_qf_names[i]);
2963#endif
617ba13b 2964 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2965 brelse(bh);
2966out_fail:
2967 sb->s_fs_info = NULL;
f6830165 2968 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2969 kfree(sbi);
2970 lock_kernel();
1d1fe1ee 2971 return ret;
ac27a0ec
DK		 2972}
2973
2974/*
2975 * Setup any per-fs journal parameters now. We'll do this both on
2976 * initial mount, once the journal has been initialised but before we've
2977 * done any recovery; and again on any subsequent remount.
2978 */
617ba13b 2979static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2980{
617ba13b 2981 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 2982
30773840
TT		 2983 journal->j_commit_interval = sbi->s_commit_interval;
2984 journal->j_min_batch_time = sbi->s_min_batch_time;
2985 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 2986
2987 spin_lock(&journal->j_state_lock);
2988 if (test_opt(sb, BARRIER))
dab291af 2989 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2990 else
dab291af 2991 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 2992 if (test_opt(sb, DATA_ERR_ABORT))
2993 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2994 else
2995 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 2996 spin_unlock(&journal->j_state_lock);
2997}
2998
617ba13b 2999static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3000 unsigned int journal_inum)
3001{
3002 struct inode *journal_inode;
3003 journal_t *journal;
3004
0390131b
FM		 3005 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3006
ac27a0ec
DK		 3007 /* First, test for the existence of a valid inode on disk. Bad
3008 * things happen if we iget() an unused inode, as the subsequent
3009 * iput() will try to delete it. */
3010
1d1fe1ee
DH		 3011 journal_inode = ext4_iget(sb, journal_inum);
3012 if (IS_ERR(journal_inode)) {
b31e1552 3013 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3014 return NULL;
3015 }
3016 if (!journal_inode->i_nlink) {
3017 make_bad_inode(journal_inode);
3018 iput(journal_inode);
b31e1552 3019 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3020 return NULL;
3021 }
3022
e5f8eab8 3023 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3024 journal_inode, journal_inode->i_size);
1d1fe1ee 3025 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3026 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3027 iput(journal_inode);
3028 return NULL;
3029 }
3030
dab291af 3031 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3032 if (!journal) {
b31e1552 3033 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3034 iput(journal_inode);
3035 return NULL;
3036 }
3037 journal->j_private = sb;
617ba13b 3038 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3039 return journal;
3040}
3041
617ba13b 3042static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3043 dev_t j_dev)
3044{
2b2d6d01 3045 struct buffer_head *bh;
ac27a0ec 3046 journal_t *journal;
617ba13b
MC		 3047 ext4_fsblk_t start;
3048 ext4_fsblk_t len;
ac27a0ec 3049 int hblock, blocksize;
617ba13b 3050 ext4_fsblk_t sb_block;
ac27a0ec 3051 unsigned long offset;
2b2d6d01 3052 struct ext4_super_block *es;
ac27a0ec
DK		 3053 struct block_device *bdev;
3054
0390131b
FM		 3055 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3056
b31e1552 3057 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3058 if (bdev == NULL)
3059 return NULL;
3060
3061 if (bd_claim(bdev, sb)) {
b31e1552
ES		 3062 ext4_msg(sb, KERN_ERR,
3063 "failed to claim external journal device");
9a1c3542 3064 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3065 return NULL;
3066 }
3067
3068 blocksize = sb->s_blocksize;
e1defc4f 3069 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3070 if (blocksize < hblock) {
b31e1552
ES		 3071 ext4_msg(sb, KERN_ERR,
3072 "blocksize too small for journal device");
ac27a0ec
DK		 3073 goto out_bdev;
3074 }
3075
617ba13b
MC		 3076 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3077 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3078 set_blocksize(bdev, blocksize);
3079 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3080 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3081 "external journal");
ac27a0ec
DK		 3082 goto out_bdev;
3083 }
3084
617ba13b
MC		 3085 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3086 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3087 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3088 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3089 ext4_msg(sb, KERN_ERR, "external journal has "
3090 "bad superblock");
ac27a0ec
DK		 3091 brelse(bh);
3092 goto out_bdev;
3093 }
3094
617ba13b 3095 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3096 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3097 brelse(bh);
3098 goto out_bdev;
3099 }
3100
bd81d8ee 3101 len = ext4_blocks_count(es);
ac27a0ec
DK		 3102 start = sb_block + 1;
3103 brelse(bh); /* we're done with the superblock */
3104
dab291af 3105 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3106 start, len, blocksize);
3107 if (!journal) {
b31e1552 3108 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3109 goto out_bdev;
3110 }
3111 journal->j_private = sb;
3112 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3113 wait_on_buffer(journal->j_sb_buffer);
3114 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3115 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3116 goto out_journal;
3117 }
3118 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3119 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3120 "user (unsupported) - %d",
ac27a0ec
DK		 3121 be32_to_cpu(journal->j_superblock->s_nr_users));
3122 goto out_journal;
3123 }
617ba13b
MC		 3124 EXT4_SB(sb)->journal_bdev = bdev;
3125 ext4_init_journal_params(sb, journal);
ac27a0ec 3126 return journal;
0b8e58a1 3127
ac27a0ec 3128out_journal:
dab291af 3129 jbd2_journal_destroy(journal);
ac27a0ec 3130out_bdev:
617ba13b 3131 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3132 return NULL;
3133}
3134
617ba13b
MC		 3135static int ext4_load_journal(struct super_block *sb,
3136 struct ext4_super_block *es,
ac27a0ec
DK		 3137 unsigned long journal_devnum)
3138{
3139 journal_t *journal;
3140 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3141 dev_t journal_dev;
3142 int err = 0;
3143 int really_read_only;
3144
0390131b
FM		 3145 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3146
ac27a0ec
DK		 3147 if (journal_devnum &&
3148 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3149 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3150 "numbers have changed");
ac27a0ec
DK		 3151 journal_dev = new_decode_dev(journal_devnum);
3152 } else
3153 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3154
3155 really_read_only = bdev_read_only(sb->s_bdev);
3156
3157 /*
3158 * Are we loading a blank journal or performing recovery after a
3159 * crash? For recovery, we need to check in advance whether we
3160 * can get read-write access to the device.
3161 */
617ba13b 3162 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3163 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3164 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3165 "required on readonly filesystem");
ac27a0ec 3166 if (really_read_only) {
b31e1552
ES		 3167 ext4_msg(sb, KERN_ERR, "write access "
3168 "unavailable, cannot proceed");
ac27a0ec
DK		 3169 return -EROFS;
3170 }
b31e1552
ES		 3171 ext4_msg(sb, KERN_INFO, "write access will "
3172 "be enabled during recovery");
ac27a0ec
DK		 3173 }
3174 }
3175
3176 if (journal_inum && journal_dev) {
b31e1552
ES		 3177 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3178 "and inode journals!");
ac27a0ec
DK		 3179 return -EINVAL;
3180 }
3181
3182 if (journal_inum) {
617ba13b 3183 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3184 return -EINVAL;
3185 } else {
617ba13b 3186 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3187 return -EINVAL;
3188 }
3189
90576c0b 3190 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3191 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3192
ac27a0ec 3193 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3194 err = jbd2_journal_update_format(journal);
ac27a0ec 3195 if (err) {
b31e1552 3196 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3197 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3198 return err;
3199 }
3200 }
3201
617ba13b 3202 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3203 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3204 if (!err)
dab291af 3205 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3206
3207 if (err) {
b31e1552 3208 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3209 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3210 return err;
3211 }
3212
617ba13b
MC		 3213 EXT4_SB(sb)->s_journal = journal;
3214 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3215
3216 if (journal_devnum &&
3217 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3218 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3219
3220 /* Make sure we flush the recovery flag to disk. */
e2d67052 3221 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3222 }
3223
3224 return 0;
3225}
3226
e2d67052 3227static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3228{
e2d67052 3229 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3230 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3231 int error = 0;
ac27a0ec
DK		 3232
3233 if (!sbh)
c4be0c1d 3234 return error;
914258bf
TT		 3235 if (buffer_write_io_error(sbh)) {
3236 /*
3237 * Oh, dear. A previous attempt to write the
3238 * superblock failed. This could happen because the
3239 * USB device was yanked out. Or it could happen to
3240 * be a transient write error and maybe the block will
3241 * be remapped. Nothing we can do but to retry the
3242 * write and hope for the best.
3243 */
b31e1552
ES		 3244 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3245 "superblock detected");
914258bf
TT		 3246 clear_buffer_write_io_error(sbh);
3247 set_buffer_uptodate(sbh);
3248 }
71290b36
TT		 3249 /*
3250 * If the file system is mounted read-only, don't update the
3251 * superblock write time. This avoids updating the superblock
3252 * write time when we are mounting the root file system
3253 * read/only but we need to replay the journal; at that point,
3254 * for people who are east of GMT and who make their clock
3255 * tick in localtime for Windows bug-for-bug compatibility,
3256 * the clock is set in the future, and this will cause e2fsck
3257 * to complain and force a full file system check.
3258 */
3259 if (!(sb->s_flags & MS_RDONLY))
3260 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3261 es->s_kbytes_written =
3262 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3263 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3264 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3265 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3266 &EXT4_SB(sb)->s_freeblocks_counter));
3267 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3268 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3269 sb->s_dirt = 0;
ac27a0ec
DK		 3270 BUFFER_TRACE(sbh, "marking dirty");
3271 mark_buffer_dirty(sbh);
914258bf 3272 if (sync) {
c4be0c1d
TS		 3273 error = sync_dirty_buffer(sbh);
3274 if (error)
3275 return error;
3276
3277 error = buffer_write_io_error(sbh);
3278 if (error) {
b31e1552
ES		 3279 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3280 "superblock");
914258bf
TT		 3281 clear_buffer_write_io_error(sbh);
3282 set_buffer_uptodate(sbh);
3283 }
3284 }
c4be0c1d 3285 return error;
ac27a0ec
DK		 3286}
3287
ac27a0ec
DK		 3288/*
3289 * Have we just finished recovery? If so, and if we are mounting (or
3290 * remounting) the filesystem readonly, then we will end up with a
3291 * consistent fs on disk. Record that fact.
3292 */
2b2d6d01
TT		 3293static void ext4_mark_recovery_complete(struct super_block *sb,
3294 struct ext4_super_block *es)
ac27a0ec 3295{
617ba13b 3296 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3297
0390131b
FM		 3298 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3299 BUG_ON(journal != NULL);
3300 return;
3301 }
dab291af 3302 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3303 if (jbd2_journal_flush(journal) < 0)
3304 goto out;
3305
617ba13b 3306 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3307 sb->s_flags & MS_RDONLY) {
617ba13b 3308 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3309 ext4_commit_super(sb, 1);
ac27a0ec 3310 }
7ffe1ea8
HK		 3311
3312out:
dab291af 3313 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3314}
3315
3316/*
3317 * If we are mounting (or read-write remounting) a filesystem whose journal
3318 * has recorded an error from a previous lifetime, move that error to the
3319 * main filesystem now.
3320 */
2b2d6d01
TT		 3321static void ext4_clear_journal_err(struct super_block *sb,
3322 struct ext4_super_block *es)
ac27a0ec
DK		 3323{
3324 journal_t *journal;
3325 int j_errno;
3326 const char *errstr;
3327
0390131b
FM		 3328 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3329
617ba13b 3330 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3331
3332 /*
3333 * Now check for any error status which may have been recorded in the
617ba13b 3334 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3335 */
3336
dab291af 3337 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3338 if (j_errno) {
3339 char nbuf[16];
3340
617ba13b 3341 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3342 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3343 "from previous mount: %s", errstr);
46e665e9 3344 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3345 "filesystem check.");
3346
617ba13b
MC		 3347 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3348 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3349 ext4_commit_super(sb, 1);
ac27a0ec 3350
dab291af 3351 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3352 }
3353}
3354
3355/*
3356 * Force the running and committing transactions to commit,
3357 * and wait on the commit.
3358 */
617ba13b 3359int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3360{
3361 journal_t *journal;
0390131b 3362 int ret = 0;
ac27a0ec
DK		 3363
3364 if (sb->s_flags & MS_RDONLY)
3365 return 0;
3366
617ba13b 3367 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3368 if (journal)
0390131b 3369 ret = ext4_journal_force_commit(journal);
0390131b 3370
ac27a0ec
DK		 3371 return ret;
3372}
3373
2b2d6d01 3374static void ext4_write_super(struct super_block *sb)
ac27a0ec 3375{
ebc1ac16 3376 lock_super(sb);
9ca92389 3377 ext4_commit_super(sb, 1);
ebc1ac16 3378 unlock_super(sb);
ac27a0ec
DK		 3379}
3380
617ba13b 3381static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3382{
14ce0cb4 3383 int ret = 0;
9eddacf9 3384 tid_t target;
8d5d02e6 3385 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3386
9bffad1e 3387 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 3388 flush_workqueue(sbi->dio_unwritten_wq);
3389 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 3390 if (wait)
8d5d02e6 3391 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 3392 }
14ce0cb4 3393 return ret;
ac27a0ec
DK		 3394}
3395
3396/*
3397 * LVM calls this function before a (read-only) snapshot is created. This
3398 * gives us a chance to flush the journal completely and mark the fs clean.
3399 */
c4be0c1d 3400static int ext4_freeze(struct super_block *sb)
ac27a0ec 3401{
c4be0c1d
TS		 3402 int error = 0;
3403 journal_t *journal;
ac27a0ec 3404
9ca92389
TT		 3405 if (sb->s_flags & MS_RDONLY)
3406 return 0;
ac27a0ec 3407
9ca92389 3408 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3409
9ca92389
TT		 3410 /* Now we set up the journal barrier. */
3411 jbd2_journal_lock_updates(journal);
ac27a0ec 3412
9ca92389
TT		 3413 /*
3414 * Don't clear the needs_recovery flag if we failed to flush
3415 * the journal.
3416 */
3417 error = jbd2_journal_flush(journal);
3418 if (error < 0) {
3419 out:
3420 jbd2_journal_unlock_updates(journal);
3421 return error;
ac27a0ec 3422 }
9ca92389
TT		 3423
3424 /* Journal blocked and flushed, clear needs_recovery flag. */
3425 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3426 error = ext4_commit_super(sb, 1);
3427 if (error)
3428 goto out;
c4be0c1d 3429 return 0;
ac27a0ec
DK		 3430}
3431
3432/*
3433 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3434 * flag here, even though the filesystem is not technically dirty yet.
3435 */
c4be0c1d 3436static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3437{
9ca92389
TT		 3438 if (sb->s_flags & MS_RDONLY)
3439 return 0;
3440
3441 lock_super(sb);
3442 /* Reset the needs_recovery flag before the fs is unlocked. */
3443 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3444 ext4_commit_super(sb, 1);
3445 unlock_super(sb);
3446 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3447 return 0;
ac27a0ec
DK		 3448}
3449
2b2d6d01 3450static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3451{
2b2d6d01 3452 struct ext4_super_block *es;
617ba13b
MC		 3453 struct ext4_sb_info *sbi = EXT4_SB(sb);
3454 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3455 unsigned long old_sb_flags;
617ba13b 3456 struct ext4_mount_options old_opts;
8a266467 3457 ext4_group_t g;
b3881f74 3458 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3459 int err;
3460#ifdef CONFIG_QUOTA
3461 int i;
3462#endif
3463
337eb00a
AIB		 3464 lock_kernel();
3465
ac27a0ec 3466 /* Store the original options */
bbd6851a 3467 lock_super(sb);
ac27a0ec
DK		 3468 old_sb_flags = sb->s_flags;
3469 old_opts.s_mount_opt = sbi->s_mount_opt;
3470 old_opts.s_resuid = sbi->s_resuid;
3471 old_opts.s_resgid = sbi->s_resgid;
3472 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3473 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3474 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3475#ifdef CONFIG_QUOTA
3476 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3477 for (i = 0; i < MAXQUOTAS; i++)
3478 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3479#endif
b3881f74
TT		 3480 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3481 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3482
3483 /*
3484 * Allow the "check" option to be passed as a remount option.
3485 */
b3881f74
TT		 3486 if (!parse_options(data, sb, NULL, &journal_ioprio,
3487 &n_blocks_count, 1)) {
ac27a0ec
DK		 3488 err = -EINVAL;
3489 goto restore_opts;
3490 }
3491
4ab2f15b 3492 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
46e665e9 3493 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3494
3495 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3496 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3497
3498 es = sbi->s_es;
3499
b3881f74 3500 if (sbi->s_journal) {
0390131b 3501 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3502 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3503 }
ac27a0ec
DK		 3504
3505 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3506 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 3507 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 3508 err = -EROFS;
3509 goto restore_opts;
3510 }
3511
3512 if (*flags & MS_RDONLY) {
3513 /*
3514 * First of all, the unconditional stuff we have to do
3515 * to disable replay of the journal when we next remount
3516 */
3517 sb->s_flags |= MS_RDONLY;
3518
3519 /*
3520 * OK, test if we are remounting a valid rw partition
3521 * readonly, and if so set the rdonly flag and then
3522 * mark the partition as valid again.
3523 */
617ba13b
MC		 3524 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3525 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3526 es->s_state = cpu_to_le16(sbi->s_mount_state);
3527
a63c9eb2 3528 if (sbi->s_journal)
0390131b 3529 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3530 } else {
a13fb1a4
ES		 3531 /* Make sure we can mount this feature set readwrite */
3532 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 3533 err = -EROFS;
3534 goto restore_opts;
3535 }
8a266467
TT		 3536 /*
3537 * Make sure the group descriptor checksums
0b8e58a1 3538 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 3539 */
3540 for (g = 0; g < sbi->s_groups_count; g++) {
3541 struct ext4_group_desc *gdp =
3542 ext4_get_group_desc(sb, g, NULL);
3543
3544 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 3545 ext4_msg(sb, KERN_ERR,
3546 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 3547 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3548 le16_to_cpu(gdp->bg_checksum));
3549 err = -EINVAL;
3550 goto restore_opts;
3551 }
3552 }
3553
ead6596b
ES		 3554 /*
3555 * If we have an unprocessed orphan list hanging
3556 * around from a previously readonly bdev mount,
3557 * require a full umount/remount for now.
3558 */
3559 if (es->s_last_orphan) {
b31e1552 3560 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 3561 "remount RDWR because of unprocessed "
3562 "orphan inode list. Please "
b31e1552 3563 "umount/remount instead");
ead6596b
ES		 3564 err = -EINVAL;
3565 goto restore_opts;
3566 }
3567
ac27a0ec
DK		 3568 /*
3569 * Mounting a RDONLY partition read-write, so reread
3570 * and store the current valid flag. (It may have
3571 * been changed by e2fsck since we originally mounted
3572 * the partition.)
3573 */
0390131b
FM		 3574 if (sbi->s_journal)
3575 ext4_clear_journal_err(sb, es);
ac27a0ec 3576 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3577 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3578 goto restore_opts;
2b2d6d01 3579 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3580 sb->s_flags &= ~MS_RDONLY;
3581 }
3582 }
6fd058f7 3583 ext4_setup_system_zone(sb);
0390131b 3584 if (sbi->s_journal == NULL)
e2d67052 3585 ext4_commit_super(sb, 1);
0390131b 3586
ac27a0ec
DK		 3587#ifdef CONFIG_QUOTA
3588 /* Release old quota file names */
3589 for (i = 0; i < MAXQUOTAS; i++)
3590 if (old_opts.s_qf_names[i] &&
3591 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3592 kfree(old_opts.s_qf_names[i]);
3593#endif
bbd6851a 3594 unlock_super(sb);
337eb00a 3595 unlock_kernel();
ac27a0ec 3596 return 0;
0b8e58a1 3597
ac27a0ec
DK		 3598restore_opts:
3599 sb->s_flags = old_sb_flags;
3600 sbi->s_mount_opt = old_opts.s_mount_opt;
3601 sbi->s_resuid = old_opts.s_resuid;
3602 sbi->s_resgid = old_opts.s_resgid;
3603 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3604 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3605 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3606#ifdef CONFIG_QUOTA
3607 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3608 for (i = 0; i < MAXQUOTAS; i++) {
3609 if (sbi->s_qf_names[i] &&
3610 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3611 kfree(sbi->s_qf_names[i]);
3612 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3613 }
3614#endif
bbd6851a 3615 unlock_super(sb);
337eb00a 3616 unlock_kernel();
ac27a0ec
DK		 3617 return err;
3618}
3619
2b2d6d01 3620static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3621{
3622 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3623 struct ext4_sb_info *sbi = EXT4_SB(sb);
3624 struct ext4_super_block *es = sbi->s_es;
960cc398 3625 u64 fsid;
ac27a0ec 3626
5e70030d
BP		 3627 if (test_opt(sb, MINIX_DF)) {
3628 sbi->s_overhead_last = 0;
6bc9feff 3629 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3630 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3631 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3632
3633 /*
5e70030d
BP		 3634 * Compute the overhead (FS structures). This is constant
3635 * for a given filesystem unless the number of block groups
3636 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3637 */
3638
3639 /*
3640 * All of the blocks before first_data_block are
3641 * overhead
3642 */
3643 overhead = le32_to_cpu(es->s_first_data_block);
3644
3645 /*
3646 * Add the overhead attributed to the superblock and
3647 * block group descriptors. If the sparse superblocks
3648 * feature is turned on, then not all groups have this.
3649 */
3650 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3651 overhead += ext4_bg_has_super(sb, i) +
3652 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3653 cond_resched();
3654 }
3655
3656 /*
3657 * Every block group has an inode bitmap, a block
3658 * bitmap, and an inode table.
3659 */
5e70030d
BP		 3660 overhead += ngroups * (2 + sbi->s_itb_per_group);
3661 sbi->s_overhead_last = overhead;
3662 smp_wmb();
6bc9feff 3663 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3664 }
3665
617ba13b 3666 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3667 buf->f_bsize = sb->s_blocksize;
5e70030d 3668 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3669 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3670 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
bd81d8ee
LV		 3671 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3672 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3673 buf->f_bavail = 0;
3674 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3675 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 3676 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3677 fsid = le64_to_cpup((void *)es->s_uuid) ^
3678 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3679 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3680 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 3681
ac27a0ec
DK		 3682 return 0;
3683}
3684
0b8e58a1
AD		 3685/* Helper function for writing quotas on sync - we need to start transaction
3686 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 3687 * Process 1 Process 2
617ba13b 3688 * ext4_create() quota_sync()
a269eb18
JK		 3689 * jbd2_journal_start() write_dquot()
3690 * vfs_dq_init() down(dqio_mutex)
dab291af 3691 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3692 *
3693 */
3694
3695#ifdef CONFIG_QUOTA
3696
3697static inline struct inode *dquot_to_inode(struct dquot *dquot)
3698{
3699 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3700}
3701
617ba13b 3702static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3703{
3704 int ret, err;
3705 handle_t *handle;
3706 struct inode *inode;
3707
3708 inode = dquot_to_inode(dquot);
617ba13b 3709 handle = ext4_journal_start(inode,
0b8e58a1 3710 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3711 if (IS_ERR(handle))
3712 return PTR_ERR(handle);
3713 ret = dquot_commit(dquot);
617ba13b 3714 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3715 if (!ret)
3716 ret = err;
3717 return ret;
3718}
3719
617ba13b 3720static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3721{
3722 int ret, err;
3723 handle_t *handle;
3724
617ba13b 3725 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3726 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3727 if (IS_ERR(handle))
3728 return PTR_ERR(handle);
3729 ret = dquot_acquire(dquot);
617ba13b 3730 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3731 if (!ret)
3732 ret = err;
3733 return ret;
3734}
3735
617ba13b 3736static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3737{
3738 int ret, err;
3739 handle_t *handle;
3740
617ba13b 3741 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3742 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3743 if (IS_ERR(handle)) {
3744 /* Release dquot anyway to avoid endless cycle in dqput() */
3745 dquot_release(dquot);
ac27a0ec 3746 return PTR_ERR(handle);
9c3013e9 3747 }
ac27a0ec 3748 ret = dquot_release(dquot);
617ba13b 3749 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3750 if (!ret)
3751 ret = err;
3752 return ret;
3753}
3754
617ba13b 3755static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3756{
2c8be6b2 3757 /* Are we journaling quotas? */
617ba13b
MC		 3758 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3759 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3760 dquot_mark_dquot_dirty(dquot);
617ba13b 3761 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3762 } else {
3763 return dquot_mark_dquot_dirty(dquot);
3764 }
3765}
3766
617ba13b 3767static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3768{
3769 int ret, err;
3770 handle_t *handle;
3771
3772 /* Data block + inode block */
617ba13b 3773 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3774 if (IS_ERR(handle))
3775 return PTR_ERR(handle);
3776 ret = dquot_commit_info(sb, type);
617ba13b 3777 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3778 if (!ret)
3779 ret = err;
3780 return ret;
3781}
3782
3783/*
3784 * Turn on quotas during mount time - we need to find
3785 * the quota file and such...
3786 */
617ba13b 3787static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3788{
617ba13b 3789 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
0b8e58a1 3790 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3791}
3792
3793/*
3794 * Standard function to be called on quota_on
3795 */
617ba13b 3796static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3797 char *name, int remount)
ac27a0ec
DK		 3798{
3799 int err;
8264613d 3800 struct path path;
ac27a0ec
DK		 3801
3802 if (!test_opt(sb, QUOTA))
3803 return -EINVAL;
8264613d 3804 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3805 if (remount)
8264613d 3806 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3807
8264613d 3808 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3809 if (err)
3810 return err;
0623543b 3811
ac27a0ec 3812 /* Quotafile not on the same filesystem? */
8264613d
AV		 3813 if (path.mnt->mnt_sb != sb) {
3814 path_put(&path);
ac27a0ec
DK		 3815 return -EXDEV;
3816 }
0623543b
JK		 3817 /* Journaling quota? */
3818 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3819 /* Quotafile not in fs root? */
8264613d 3820 if (path.dentry->d_parent != sb->s_root)
b31e1552
ES		 3821 ext4_msg(sb, KERN_WARNING,
3822 "Quota file not on filesystem root. "
3823 "Journaled quota will not work");
2b2d6d01 3824 }
0623543b
JK		 3825
3826 /*
3827 * When we journal data on quota file, we have to flush journal to see
3828 * all updates to the file when we bypass pagecache...
3829 */
0390131b
FM		 3830 if (EXT4_SB(sb)->s_journal &&
3831 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3832 /*
3833 * We don't need to lock updates but journal_flush() could
3834 * otherwise be livelocked...
3835 */
3836 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3837 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3838 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3839 if (err) {
8264613d 3840 path_put(&path);
7ffe1ea8
HK		 3841 return err;
3842 }
0623543b
JK		 3843 }
3844
8264613d
AV		 3845 err = vfs_quota_on_path(sb, type, format_id, &path);
3846 path_put(&path);
77e69dac 3847 return err;
ac27a0ec
DK		 3848}
3849
3850/* Read data from quotafile - avoid pagecache and such because we cannot afford
3851 * acquiring the locks... As quota files are never truncated and quota code
3852 * itself serializes the operations (and noone else should touch the files)
3853 * we don't have to be afraid of races */
617ba13b 3854static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3855 size_t len, loff_t off)
3856{
3857 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3858 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3859 int err = 0;
3860 int offset = off & (sb->s_blocksize - 1);
3861 int tocopy;
3862 size_t toread;
3863 struct buffer_head *bh;
3864 loff_t i_size = i_size_read(inode);
3865
3866 if (off > i_size)
3867 return 0;
3868 if (off+len > i_size)
3869 len = i_size-off;
3870 toread = len;
3871 while (toread > 0) {
3872 tocopy = sb->s_blocksize - offset < toread ?
3873 sb->s_blocksize - offset : toread;
617ba13b 3874 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3875 if (err)
3876 return err;
3877 if (!bh) /* A hole? */
3878 memset(data, 0, tocopy);
3879 else
3880 memcpy(data, bh->b_data+offset, tocopy);
3881 brelse(bh);
3882 offset = 0;
3883 toread -= tocopy;
3884 data += tocopy;
3885 blk++;
3886 }
3887 return len;
3888}
3889
3890/* Write to quotafile (we know the transaction is already started and has
3891 * enough credits) */
617ba13b 3892static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3893 const char *data, size_t len, loff_t off)
3894{
3895 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3896 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3897 int err = 0;
3898 int offset = off & (sb->s_blocksize - 1);
3899 int tocopy;
617ba13b 3900 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3901 size_t towrite = len;
3902 struct buffer_head *bh;
3903 handle_t *handle = journal_current_handle();
3904
0390131b 3905 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 3906 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3907 " cancelled because transaction is not started",
9c3013e9
JK		 3908 (unsigned long long)off, (unsigned long long)len);
3909 return -EIO;
3910 }
ac27a0ec
DK		 3911 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3912 while (towrite > 0) {
3913 tocopy = sb->s_blocksize - offset < towrite ?
3914 sb->s_blocksize - offset : towrite;
617ba13b 3915 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3916 if (!bh)
3917 goto out;
3918 if (journal_quota) {
617ba13b 3919 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3920 if (err) {
3921 brelse(bh);
3922 goto out;
3923 }
3924 }
3925 lock_buffer(bh);
3926 memcpy(bh->b_data+offset, data, tocopy);
3927 flush_dcache_page(bh->b_page);
3928 unlock_buffer(bh);
3929 if (journal_quota)
0390131b 3930 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3931 else {
3932 /* Always do at least ordered writes for quotas */
678aaf48 3933 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3934 mark_buffer_dirty(bh);
3935 }
3936 brelse(bh);
3937 if (err)
3938 goto out;
3939 offset = 0;
3940 towrite -= tocopy;
3941 data += tocopy;
3942 blk++;
3943 }
3944out:
4d04e4fb
JK		 3945 if (len == towrite) {
3946 mutex_unlock(&inode->i_mutex);
ac27a0ec 3947 return err;
4d04e4fb 3948 }
ac27a0ec
DK		 3949 if (inode->i_size < off+len-towrite) {
3950 i_size_write(inode, off+len-towrite);
617ba13b 3951 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3952 }
ac27a0ec 3953 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3954 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3955 mutex_unlock(&inode->i_mutex);
3956 return len - towrite;
3957}
3958
3959#endif
3960
0b8e58a1
AD		 3961static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3962 const char *dev_name, void *data, struct vfsmount *mnt)
ac27a0ec 3963{
0b8e58a1 3964 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
ac27a0ec
DK		 3965}
3966
24b58424
TT		 3967#if !defined(CONTIG_EXT2_FS) && defined(CONFIG_EXT4_USE_FOR_EXT23)
3968static struct file_system_type ext2_fs_type = {
3969 .owner = THIS_MODULE,
3970 .name = "ext2",
3971 .get_sb = ext4_get_sb,
3972 .kill_sb = kill_block_super,
3973 .fs_flags = FS_REQUIRES_DEV,
3974};
3975
3976static inline void register_as_ext2(void)
3977{
3978 int err = register_filesystem(&ext2_fs_type);
3979 if (err)
3980 printk(KERN_WARNING
3981 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
3982}
3983
3984static inline void unregister_as_ext2(void)
3985{
3986 unregister_filesystem(&ext2_fs_type);
3987}
3988#else
3989static inline void register_as_ext2(void) { }
3990static inline void unregister_as_ext2(void) { }
3991#endif
3992
3993#if !defined(CONTIG_EXT3_FS) && defined(CONFIG_EXT4_USE_FOR_EXT23)
3994static struct file_system_type ext3_fs_type = {
3995 .owner = THIS_MODULE,
3996 .name = "ext3",
3997 .get_sb = ext4_get_sb,
3998 .kill_sb = kill_block_super,
3999 .fs_flags = FS_REQUIRES_DEV,
4000};
4001
4002static inline void register_as_ext3(void)
4003{
4004 int err = register_filesystem(&ext3_fs_type);
4005 if (err)
4006 printk(KERN_WARNING
4007 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4008}
4009
4010static inline void unregister_as_ext3(void)
4011{
4012 unregister_filesystem(&ext3_fs_type);
4013}
4014#else
4015static inline void register_as_ext3(void) { }
4016static inline void unregister_as_ext3(void) { }
4017#endif
4018
03010a33
TT		 4019static struct file_system_type ext4_fs_type = {
4020 .owner = THIS_MODULE,
4021 .name = "ext4",
4022 .get_sb = ext4_get_sb,
4023 .kill_sb = kill_block_super,
4024 .fs_flags = FS_REQUIRES_DEV,
4025};
4026
617ba13b 4027static int __init init_ext4_fs(void)
ac27a0ec 4028{
c9de560d
AT		 4029 int err;
4030
6fd058f7
TT		 4031 err = init_ext4_system_zone();
4032 if (err)
4033 return err;
3197ebdb
TT		 4034 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4035 if (!ext4_kset)
6fd058f7 4036 goto out4;
9f6200bb 4037 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 4038 err = init_ext4_mballoc();
ac27a0ec 4039 if (err)
6fd058f7 4040 goto out3;
c9de560d
AT		 4041
4042 err = init_ext4_xattr();
4043 if (err)
4044 goto out2;
ac27a0ec
DK		 4045 err = init_inodecache();
4046 if (err)
4047 goto out1;
24b58424
TT		 4048 register_as_ext2();
4049 register_as_ext3();
03010a33 4050 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4051 if (err)
4052 goto out;
4053 return 0;
4054out:
24b58424
TT		 4055 unregister_as_ext2();
4056 unregister_as_ext3();
ac27a0ec
DK		 4057 destroy_inodecache();
4058out1:
617ba13b 4059 exit_ext4_xattr();
c9de560d
AT		 4060out2:
4061 exit_ext4_mballoc();
6fd058f7
TT		 4062out3:
4063 remove_proc_entry("fs/ext4", NULL);
4064 kset_unregister(ext4_kset);
4065out4:
4066 exit_ext4_system_zone();
ac27a0ec
DK		 4067 return err;
4068}
4069
617ba13b 4070static void __exit exit_ext4_fs(void)
ac27a0ec 4071{
24b58424
TT		 4072 unregister_as_ext2();
4073 unregister_as_ext3();
03010a33 4074 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4075 destroy_inodecache();
617ba13b 4076 exit_ext4_xattr();
c9de560d 4077 exit_ext4_mballoc();
9f6200bb 4078 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4079 kset_unregister(ext4_kset);
6fd058f7 4080 exit_ext4_system_zone();
ac27a0ec
DK		 4081}
4082
4083MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4084MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4085MODULE_LICENSE("GPL");
617ba13b
MC		 4086module_init(init_ext4_fs)
4087module_exit(exit_ext4_fs)
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