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ext4: Clean up ext4_get_blocks() so it does not depend on bh_result->b_state
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
29#include <linux/smp_lock.h>
30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
9f6200bb 38#include <linux/proc_fs.h>
3197ebdb 39#include <linux/ctype.h>
ede86cc4 40#include <linux/marker.h>
1330593e 41#include <linux/log2.h>
717d50e4 42#include <linux/crc16.h>
ac27a0ec
DK		 43#include <asm/uaccess.h>
44
3dcf5451
CH		 45#include "ext4.h"
46#include "ext4_jbd2.h"
ac27a0ec
DK		 47#include "xattr.h"
48#include "acl.h"
ac27a0ec 49
f4033903
CW		 50static int default_mb_history_length = 1000;
51
52module_param_named(default_mb_history_length, default_mb_history_length,
53 int, 0644);
54MODULE_PARM_DESC(default_mb_history_length,
55 "Default number of entries saved for mb_history");
56
9f6200bb 57struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
9f6200bb 59
617ba13b 60static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 61 unsigned long journal_devnum);
e2d67052 62static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 63static void ext4_mark_recovery_complete(struct super_block *sb,
64 struct ext4_super_block *es);
65static void ext4_clear_journal_err(struct super_block *sb,
66 struct ext4_super_block *es);
617ba13b 67static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 68static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 69 char nbuf[16]);
2b2d6d01
TT		 70static int ext4_remount(struct super_block *sb, int *flags, char *data);
71static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 72static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 73static void ext4_write_super(struct super_block *sb);
c4be0c1d 74static int ext4_freeze(struct super_block *sb);
ac27a0ec 75
bd81d8ee 76
8fadc143
AR		 77ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
78 struct ext4_group_desc *bg)
bd81d8ee 79{
3a14589c 80 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 81 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 82 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 83}
84
8fadc143
AR		 85ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
86 struct ext4_group_desc *bg)
bd81d8ee 87{
5272f837 88 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 89 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 90 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 91}
92
8fadc143
AR		 93ext4_fsblk_t ext4_inode_table(struct super_block *sb,
94 struct ext4_group_desc *bg)
bd81d8ee 95{
5272f837 96 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 97 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 98 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 99}
100
560671a0
AK		 101__u32 ext4_free_blks_count(struct super_block *sb,
102 struct ext4_group_desc *bg)
103{
104 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
105 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
106 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
107}
108
109__u32 ext4_free_inodes_count(struct super_block *sb,
110 struct ext4_group_desc *bg)
111{
112 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
113 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
114 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
115}
116
117__u32 ext4_used_dirs_count(struct super_block *sb,
118 struct ext4_group_desc *bg)
119{
120 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
121 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
122 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
123}
124
125__u32 ext4_itable_unused_count(struct super_block *sb,
126 struct ext4_group_desc *bg)
127{
128 return le16_to_cpu(bg->bg_itable_unused_lo) |
129 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
130 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
131}
132
8fadc143
AR		 133void ext4_block_bitmap_set(struct super_block *sb,
134 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 135{
3a14589c 136 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 137 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
138 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 139}
140
8fadc143
AR		 141void ext4_inode_bitmap_set(struct super_block *sb,
142 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 143{
5272f837 144 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 145 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
146 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 147}
148
8fadc143
AR		 149void ext4_inode_table_set(struct super_block *sb,
150 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 151{
5272f837 152 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 153 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
154 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 155}
156
560671a0
AK		 157void ext4_free_blks_set(struct super_block *sb,
158 struct ext4_group_desc *bg, __u32 count)
159{
160 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
161 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
162 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
163}
164
165void ext4_free_inodes_set(struct super_block *sb,
166 struct ext4_group_desc *bg, __u32 count)
167{
168 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
169 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
170 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
171}
172
173void ext4_used_dirs_set(struct super_block *sb,
174 struct ext4_group_desc *bg, __u32 count)
175{
176 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
177 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
178 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
179}
180
181void ext4_itable_unused_set(struct super_block *sb,
182 struct ext4_group_desc *bg, __u32 count)
183{
184 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
185 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
186 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
187}
188
ac27a0ec 189/*
dab291af 190 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 191 *
192 * The only special thing we need to do here is to make sure that all
193 * journal_end calls result in the superblock being marked dirty, so
194 * that sync() will call the filesystem's write_super callback if
195 * appropriate.
196 */
617ba13b 197handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 198{
199 journal_t *journal;
200
201 if (sb->s_flags & MS_RDONLY)
202 return ERR_PTR(-EROFS);
203
204 /* Special case here: if the journal has aborted behind our
205 * backs (eg. EIO in the commit thread), then we still need to
206 * take the FS itself readonly cleanly. */
617ba13b 207 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 208 if (journal) {
209 if (is_journal_aborted(journal)) {
210 ext4_abort(sb, __func__,
211 "Detected aborted journal");
212 return ERR_PTR(-EROFS);
213 }
214 return jbd2_journal_start(journal, nblocks);
ac27a0ec 215 }
0390131b
FM		 216 /*
217 * We're not journaling, return the appropriate indication.
218 */
219 current->journal_info = EXT4_NOJOURNAL_HANDLE;
220 return current->journal_info;
ac27a0ec
DK		 221}
222
223/*
224 * The only special thing we need to do here is to make sure that all
dab291af 225 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 226 * that sync() will call the filesystem's write_super callback if
227 * appropriate.
228 */
617ba13b 229int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 230{
231 struct super_block *sb;
232 int err;
233 int rc;
234
0390131b
FM		 235 if (!ext4_handle_valid(handle)) {
236 /*
237 * Do this here since we don't call jbd2_journal_stop() in
238 * no-journal mode.
239 */
240 current->journal_info = NULL;
241 return 0;
242 }
ac27a0ec
DK		 243 sb = handle->h_transaction->t_journal->j_private;
244 err = handle->h_err;
dab291af 245 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 246
247 if (!err)
248 err = rc;
249 if (err)
617ba13b 250 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 251 return err;
252}
253
617ba13b 254void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 255 struct buffer_head *bh, handle_t *handle, int err)
256{
257 char nbuf[16];
617ba13b 258 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 259
0390131b
FM		 260 BUG_ON(!ext4_handle_valid(handle));
261
ac27a0ec
DK		 262 if (bh)
263 BUFFER_TRACE(bh, "abort");
264
265 if (!handle->h_err)
266 handle->h_err = err;
267
268 if (is_handle_aborted(handle))
269 return;
270
271 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
272 caller, errstr, err_fn);
273
dab291af 274 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 275}
276
277/* Deal with the reporting of failure conditions on a filesystem such as
278 * inconsistencies detected or read IO failures.
279 *
280 * On ext2, we can store the error state of the filesystem in the
617ba13b 281 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 282 * write ordering constraints on the superblock which prevent us from
283 * writing it out straight away; and given that the journal is about to
284 * be aborted, we can't rely on the current, or future, transactions to
285 * write out the superblock safely.
286 *
dab291af 287 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 288 * the journal instead. On recovery, the journal will compain about
289 * that error until we've noted it down and cleared it.
290 */
291
617ba13b 292static void ext4_handle_error(struct super_block *sb)
ac27a0ec 293{
617ba13b 294 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 295
617ba13b
MC		 296 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
297 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 298
299 if (sb->s_flags & MS_RDONLY)
300 return;
301
2b2d6d01 302 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 303 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 304
617ba13b 305 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 306 if (journal)
dab291af 307 jbd2_journal_abort(journal, -EIO);
ac27a0ec 308 }
2b2d6d01
TT		 309 if (test_opt(sb, ERRORS_RO)) {
310 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 311 sb->s_flags |= MS_RDONLY;
312 }
e2d67052 313 ext4_commit_super(sb, 1);
ac27a0ec 314 if (test_opt(sb, ERRORS_PANIC))
617ba13b 315 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 316 sb->s_id);
317}
318
2b2d6d01
TT		 319void ext4_error(struct super_block *sb, const char *function,
320 const char *fmt, ...)
ac27a0ec
DK		 321{
322 va_list args;
323
324 va_start(args, fmt);
2b2d6d01 325 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 326 vprintk(fmt, args);
327 printk("\n");
328 va_end(args);
329
617ba13b 330 ext4_handle_error(sb);
ac27a0ec
DK		 331}
332
2b2d6d01 333static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 334 char nbuf[16])
335{
336 char *errstr = NULL;
337
338 switch (errno) {
339 case -EIO:
340 errstr = "IO failure";
341 break;
342 case -ENOMEM:
343 errstr = "Out of memory";
344 break;
345 case -EROFS:
dab291af 346 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 347 errstr = "Journal has aborted";
348 else
349 errstr = "Readonly filesystem";
350 break;
351 default:
352 /* If the caller passed in an extra buffer for unknown
353 * errors, textualise them now. Else we just return
354 * NULL. */
355 if (nbuf) {
356 /* Check for truncated error codes... */
357 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
358 errstr = nbuf;
359 }
360 break;
361 }
362
363 return errstr;
364}
365
617ba13b 366/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 367 * automatically and invokes the appropriate error response. */
368
2b2d6d01 369void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 370{
371 char nbuf[16];
372 const char *errstr;
373
374 /* Special case: if the error is EROFS, and we're not already
375 * inside a transaction, then there's really no point in logging
376 * an error. */
377 if (errno == -EROFS && journal_current_handle() == NULL &&
378 (sb->s_flags & MS_RDONLY))
379 return;
380
617ba13b 381 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 382 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
383 sb->s_id, function, errstr);
ac27a0ec 384
617ba13b 385 ext4_handle_error(sb);
ac27a0ec
DK		 386}
387
388/*
617ba13b 389 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 390 * abort function may be used to deal with unrecoverable failures such
391 * as journal IO errors or ENOMEM at a critical moment in log management.
392 *
393 * We unconditionally force the filesystem into an ABORT|READONLY state,
394 * unless the error response on the fs has been set to panic in which
395 * case we take the easy way out and panic immediately.
396 */
397
2b2d6d01
TT		 398void ext4_abort(struct super_block *sb, const char *function,
399 const char *fmt, ...)
ac27a0ec
DK		 400{
401 va_list args;
402
2b2d6d01 403 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 404
405 va_start(args, fmt);
2b2d6d01 406 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 407 vprintk(fmt, args);
408 printk("\n");
409 va_end(args);
410
411 if (test_opt(sb, ERRORS_PANIC))
617ba13b 412 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 413
414 if (sb->s_flags & MS_RDONLY)
415 return;
416
417 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 418 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 419 sb->s_flags |= MS_RDONLY;
617ba13b 420 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ef2cabf7
HK		 421 if (EXT4_SB(sb)->s_journal)
422 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 423}
424
2b2d6d01
TT		 425void ext4_warning(struct super_block *sb, const char *function,
426 const char *fmt, ...)
ac27a0ec
DK		 427{
428 va_list args;
429
430 va_start(args, fmt);
617ba13b 431 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 432 sb->s_id, function);
433 vprintk(fmt, args);
434 printk("\n");
435 va_end(args);
436}
437
5d1b1b3f
AK		 438void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
439 const char *function, const char *fmt, ...)
440__releases(bitlock)
441__acquires(bitlock)
442{
443 va_list args;
444 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
445
446 va_start(args, fmt);
447 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
448 vprintk(fmt, args);
449 printk("\n");
450 va_end(args);
451
452 if (test_opt(sb, ERRORS_CONT)) {
453 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
454 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 455 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 456 return;
457 }
458 ext4_unlock_group(sb, grp);
459 ext4_handle_error(sb);
460 /*
461 * We only get here in the ERRORS_RO case; relocking the group
462 * may be dangerous, but nothing bad will happen since the
463 * filesystem will have already been marked read/only and the
464 * journal has been aborted. We return 1 as a hint to callers
465 * who might what to use the return value from
466 * ext4_grp_locked_error() to distinguish beween the
467 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
468 * aggressively from the ext4 function in question, with a
469 * more appropriate error code.
470 */
471 ext4_lock_group(sb, grp);
472 return;
473}
474
475
617ba13b 476void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 477{
617ba13b 478 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 479
617ba13b 480 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 481 return;
482
46e665e9 483 ext4_warning(sb, __func__,
ac27a0ec
DK		 484 "updating to rev %d because of new feature flag, "
485 "running e2fsck is recommended",
617ba13b 486 EXT4_DYNAMIC_REV);
ac27a0ec 487
617ba13b
MC		 488 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
489 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
490 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 491 /* leave es->s_feature_*compat flags alone */
492 /* es->s_uuid will be set by e2fsck if empty */
493
494 /*
495 * The rest of the superblock fields should be zero, and if not it
496 * means they are likely already in use, so leave them alone. We
497 * can leave it up to e2fsck to clean up any inconsistencies there.
498 */
499}
500
501/*
502 * Open the external journal device
503 */
617ba13b 504static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 505{
506 struct block_device *bdev;
507 char b[BDEVNAME_SIZE];
508
509 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
510 if (IS_ERR(bdev))
511 goto fail;
512 return bdev;
513
514fail:
abda1418 515 printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 516 __bdevname(dev, b), PTR_ERR(bdev));
517 return NULL;
518}
519
520/*
521 * Release the journal device
522 */
617ba13b 523static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 524{
525 bd_release(bdev);
9a1c3542 526 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 527}
528
617ba13b 529static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 530{
531 struct block_device *bdev;
532 int ret = -ENODEV;
533
534 bdev = sbi->journal_bdev;
535 if (bdev) {
617ba13b 536 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 537 sbi->journal_bdev = NULL;
538 }
539 return ret;
540}
541
542static inline struct inode *orphan_list_entry(struct list_head *l)
543{
617ba13b 544 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 545}
546
617ba13b 547static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 548{
549 struct list_head *l;
550
551 printk(KERN_ERR "sb orphan head is %d\n",
552 le32_to_cpu(sbi->s_es->s_last_orphan));
553
554 printk(KERN_ERR "sb_info orphan list:\n");
555 list_for_each(l, &sbi->s_orphan) {
556 struct inode *inode = orphan_list_entry(l);
557 printk(KERN_ERR " "
558 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
559 inode->i_sb->s_id, inode->i_ino, inode,
560 inode->i_mode, inode->i_nlink,
561 NEXT_ORPHAN(inode));
562 }
563}
564
2b2d6d01 565static void ext4_put_super(struct super_block *sb)
ac27a0ec 566{
617ba13b
MC		 567 struct ext4_sb_info *sbi = EXT4_SB(sb);
568 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 569 int i, err;
ac27a0ec 570
c9de560d 571 ext4_mb_release(sb);
a86c6181 572 ext4_ext_release(sb);
617ba13b 573 ext4_xattr_put_super(sb);
0390131b
FM		 574 if (sbi->s_journal) {
575 err = jbd2_journal_destroy(sbi->s_journal);
576 sbi->s_journal = NULL;
577 if (err < 0)
578 ext4_abort(sb, __func__,
579 "Couldn't clean up the journal");
580 }
ac27a0ec 581 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 582 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 583 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 584 ext4_commit_super(sb, 1);
ac27a0ec 585 }
240799cd 586 if (sbi->s_proc) {
9f6200bb 587 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 588 }
3197ebdb 589 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 590
591 for (i = 0; i < sbi->s_gdb_count; i++)
592 brelse(sbi->s_group_desc[i]);
593 kfree(sbi->s_group_desc);
c5ca7c76
TT		 594 if (is_vmalloc_addr(sbi->s_flex_groups))
595 vfree(sbi->s_flex_groups);
596 else
597 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 598 percpu_counter_destroy(&sbi->s_freeblocks_counter);
599 percpu_counter_destroy(&sbi->s_freeinodes_counter);
600 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 601 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 602 brelse(sbi->s_sbh);
603#ifdef CONFIG_QUOTA
604 for (i = 0; i < MAXQUOTAS; i++)
605 kfree(sbi->s_qf_names[i]);
606#endif
607
608 /* Debugging code just in case the in-memory inode orphan list
609 * isn't empty. The on-disk one can be non-empty if we've
610 * detected an error and taken the fs readonly, but the
611 * in-memory list had better be clean by this point. */
612 if (!list_empty(&sbi->s_orphan))
613 dump_orphan_list(sb, sbi);
614 J_ASSERT(list_empty(&sbi->s_orphan));
615
f98393a6 616 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 617 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
618 /*
619 * Invalidate the journal device's buffers. We don't want them
620 * floating about in memory - the physical journal device may
621 * hotswapped, and it breaks the `ro-after' testing code.
622 */
623 sync_blockdev(sbi->journal_bdev);
f98393a6 624 invalidate_bdev(sbi->journal_bdev);
617ba13b 625 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 626 }
627 sb->s_fs_info = NULL;
3197ebdb
TT		 628 /*
629 * Now that we are completely done shutting down the
630 * superblock, we need to actually destroy the kobject.
631 */
632 unlock_kernel();
633 unlock_super(sb);
634 kobject_put(&sbi->s_kobj);
635 wait_for_completion(&sbi->s_kobj_unregister);
636 lock_super(sb);
637 lock_kernel();
705895b6 638 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 639 kfree(sbi);
640 return;
641}
642
e18b890b 643static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 644
645/*
646 * Called inside transaction, so use GFP_NOFS
647 */
617ba13b 648static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 649{
617ba13b 650 struct ext4_inode_info *ei;
ac27a0ec 651
e6b4f8da 652 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 653 if (!ei)
654 return NULL;
03010a33 655#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 656 ei->i_acl = EXT4_ACL_NOT_CACHED;
657 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec 658#endif
ac27a0ec 659 ei->vfs_inode.i_version = 1;
91246c00 660 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 661 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 662 INIT_LIST_HEAD(&ei->i_prealloc_list);
663 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 664 /*
665 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
666 * therefore it can be null here. Don't check it, just initialize
667 * jinode.
668 */
678aaf48 669 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 670 ei->i_reserved_data_blocks = 0;
671 ei->i_reserved_meta_blocks = 0;
672 ei->i_allocated_meta_blocks = 0;
673 ei->i_delalloc_reserved_flag = 0;
674 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 675 return &ei->vfs_inode;
676}
677
617ba13b 678static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 679{
9f7dd93d
VA		 680 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
681 printk("EXT4 Inode %p: orphan list check failed!\n",
682 EXT4_I(inode));
683 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
684 EXT4_I(inode), sizeof(struct ext4_inode_info),
685 true);
686 dump_stack();
687 }
617ba13b 688 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 689}
690
51cc5068 691static void init_once(void *foo)
ac27a0ec 692{
617ba13b 693 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 694
a35afb83 695 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 696#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 697 init_rwsem(&ei->xattr_sem);
ac27a0ec 698#endif
0e855ac8 699 init_rwsem(&ei->i_data_sem);
a35afb83 700 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 701}
702
703static int init_inodecache(void)
704{
617ba13b
MC		 705 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
706 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 707 0, (SLAB_RECLAIM_ACCOUNT|
708 SLAB_MEM_SPREAD),
20c2df83 709 init_once);
617ba13b 710 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 711 return -ENOMEM;
712 return 0;
713}
714
715static void destroy_inodecache(void)
716{
617ba13b 717 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 718}
719
617ba13b 720static void ext4_clear_inode(struct inode *inode)
ac27a0ec 721{
03010a33 722#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 723 if (EXT4_I(inode)->i_acl &&
724 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
725 posix_acl_release(EXT4_I(inode)->i_acl);
726 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
727 }
728 if (EXT4_I(inode)->i_default_acl &&
729 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
730 posix_acl_release(EXT4_I(inode)->i_default_acl);
731 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 732 }
733#endif
c2ea3fde 734 ext4_discard_preallocations(inode);
0390131b
FM		 735 if (EXT4_JOURNAL(inode))
736 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 737 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 738}
739
2b2d6d01
TT		 740static inline void ext4_show_quota_options(struct seq_file *seq,
741 struct super_block *sb)
ac27a0ec
DK		 742{
743#if defined(CONFIG_QUOTA)
617ba13b 744 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 745
746 if (sbi->s_jquota_fmt)
747 seq_printf(seq, ",jqfmt=%s",
af5bc92d 748 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 749
750 if (sbi->s_qf_names[USRQUOTA])
751 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
752
753 if (sbi->s_qf_names[GRPQUOTA])
754 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
755
617ba13b 756 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 757 seq_puts(seq, ",usrquota");
758
617ba13b 759 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 760 seq_puts(seq, ",grpquota");
761#endif
762}
763
d9c9bef1
MS		 764/*
765 * Show an option if
766 * - it's set to a non-default value OR
767 * - if the per-sb default is different from the global default
768 */
617ba13b 769static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 770{
aa22df2c
AK		 771 int def_errors;
772 unsigned long def_mount_opts;
ac27a0ec 773 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 774 struct ext4_sb_info *sbi = EXT4_SB(sb);
775 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 776
777 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 778 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 779
780 if (sbi->s_sb_block != 1)
781 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
782 if (test_opt(sb, MINIX_DF))
783 seq_puts(seq, ",minixdf");
aa22df2c 784 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 785 seq_puts(seq, ",grpid");
786 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
787 seq_puts(seq, ",nogrpid");
788 if (sbi->s_resuid != EXT4_DEF_RESUID ||
789 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
790 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
791 }
792 if (sbi->s_resgid != EXT4_DEF_RESGID ||
793 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
794 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
795 }
bb4f397a 796 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 797 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 798 def_errors == EXT4_ERRORS_CONTINUE) {
799 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 800 }
801 }
aa22df2c 802 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 803 seq_puts(seq, ",errors=continue");
aa22df2c 804 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 805 seq_puts(seq, ",errors=panic");
aa22df2c 806 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 807 seq_puts(seq, ",nouid32");
aa22df2c 808 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 809 seq_puts(seq, ",debug");
810 if (test_opt(sb, OLDALLOC))
811 seq_puts(seq, ",oldalloc");
03010a33 812#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 813 if (test_opt(sb, XATTR_USER) &&
814 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 815 seq_puts(seq, ",user_xattr");
816 if (!test_opt(sb, XATTR_USER) &&
817 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
818 seq_puts(seq, ",nouser_xattr");
819 }
820#endif
03010a33 821#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 822 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 823 seq_puts(seq, ",acl");
824 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
825 seq_puts(seq, ",noacl");
826#endif
30773840 827 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 828 seq_printf(seq, ",commit=%u",
829 (unsigned) (sbi->s_commit_interval / HZ));
830 }
30773840
TT		 831 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
832 seq_printf(seq, ",min_batch_time=%u",
833 (unsigned) sbi->s_min_batch_time);
834 }
835 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
836 seq_printf(seq, ",max_batch_time=%u",
837 (unsigned) sbi->s_min_batch_time);
838 }
839
571640ca
ES		 840 /*
841 * We're changing the default of barrier mount option, so
842 * let's always display its mount state so it's clear what its
843 * status is.
844 */
845 seq_puts(seq, ",barrier=");
846 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 847 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
848 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 849 if (test_opt(sb, NOBH))
850 seq_puts(seq, ",nobh");
25ec56b5
JNC		 851 if (test_opt(sb, I_VERSION))
852 seq_puts(seq, ",i_version");
dd919b98
AK		 853 if (!test_opt(sb, DELALLOC))
854 seq_puts(seq, ",nodelalloc");
855
ac27a0ec 856
cb45bbe4
MS		 857 if (sbi->s_stripe)
858 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 859 /*
860 * journal mode get enabled in different ways
861 * So just print the value even if we didn't specify it
862 */
617ba13b 863 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 864 seq_puts(seq, ",data=journal");
617ba13b 865 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 866 seq_puts(seq, ",data=ordered");
617ba13b 867 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 868 seq_puts(seq, ",data=writeback");
869
240799cd
TT		 870 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
871 seq_printf(seq, ",inode_readahead_blks=%u",
872 sbi->s_inode_readahead_blks);
873
5bf5683a
HK		 874 if (test_opt(sb, DATA_ERR_ABORT))
875 seq_puts(seq, ",data_err=abort");
876
afd4672d 877 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 878 seq_puts(seq, ",noauto_da_alloc");
afd4672d 879
617ba13b 880 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 881 return 0;
882}
883
884
1b961ac0
CH		 885static struct inode *ext4_nfs_get_inode(struct super_block *sb,
886 u64 ino, u32 generation)
ac27a0ec 887{
ac27a0ec 888 struct inode *inode;
ac27a0ec 889
617ba13b 890 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 891 return ERR_PTR(-ESTALE);
617ba13b 892 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 893 return ERR_PTR(-ESTALE);
894
895 /* iget isn't really right if the inode is currently unallocated!!
896 *
617ba13b 897 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 898 * deleted, so we should be safe.
899 *
900 * Currently we don't know the generation for parent directory, so
901 * a generation of 0 means "accept any"
902 */
1d1fe1ee
DH		 903 inode = ext4_iget(sb, ino);
904 if (IS_ERR(inode))
905 return ERR_CAST(inode);
906 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 907 iput(inode);
908 return ERR_PTR(-ESTALE);
909 }
1b961ac0
CH		 910
911 return inode;
912}
913
914static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
915 int fh_len, int fh_type)
916{
917 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
918 ext4_nfs_get_inode);
919}
920
921static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
922 int fh_len, int fh_type)
923{
924 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
925 ext4_nfs_get_inode);
ac27a0ec
DK		 926}
927
c39a7f84
TO		 928/*
929 * Try to release metadata pages (indirect blocks, directories) which are
930 * mapped via the block device. Since these pages could have journal heads
931 * which would prevent try_to_free_buffers() from freeing them, we must use
932 * jbd2 layer's try_to_free_buffers() function to release them.
933 */
934static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait)
935{
936 journal_t *journal = EXT4_SB(sb)->s_journal;
937
938 WARN_ON(PageChecked(page));
939 if (!page_has_buffers(page))
940 return 0;
941 if (journal)
942 return jbd2_journal_try_to_free_buffers(journal, page,
943 wait & ~__GFP_WAIT);
944 return try_to_free_buffers(page);
945}
946
ac27a0ec 947#ifdef CONFIG_QUOTA
af5bc92d 948#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 949#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 950
617ba13b
MC		 951static int ext4_write_dquot(struct dquot *dquot);
952static int ext4_acquire_dquot(struct dquot *dquot);
953static int ext4_release_dquot(struct dquot *dquot);
954static int ext4_mark_dquot_dirty(struct dquot *dquot);
955static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 956static int ext4_quota_on(struct super_block *sb, int type, int format_id,
957 char *path, int remount);
617ba13b
MC		 958static int ext4_quota_on_mount(struct super_block *sb, int type);
959static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 960 size_t len, loff_t off);
617ba13b 961static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 962 const char *data, size_t len, loff_t off);
963
617ba13b 964static struct dquot_operations ext4_quota_operations = {
edf72453
JK		 965 .initialize = dquot_initialize,
966 .drop = dquot_drop,
ac27a0ec 967 .alloc_space = dquot_alloc_space,
60e58e0f
MC		 968 .reserve_space = dquot_reserve_space,
969 .claim_space = dquot_claim_space,
970 .release_rsv = dquot_release_reserved_space,
971 .get_reserved_space = ext4_get_reserved_space,
ac27a0ec
DK		 972 .alloc_inode = dquot_alloc_inode,
973 .free_space = dquot_free_space,
974 .free_inode = dquot_free_inode,
975 .transfer = dquot_transfer,
617ba13b
MC		 976 .write_dquot = ext4_write_dquot,
977 .acquire_dquot = ext4_acquire_dquot,
978 .release_dquot = ext4_release_dquot,
979 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 980 .write_info = ext4_write_info,
981 .alloc_dquot = dquot_alloc,
982 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 983};
984
617ba13b
MC		 985static struct quotactl_ops ext4_qctl_operations = {
986 .quota_on = ext4_quota_on,
ac27a0ec
DK		 987 .quota_off = vfs_quota_off,
988 .quota_sync = vfs_quota_sync,
989 .get_info = vfs_get_dqinfo,
990 .set_info = vfs_set_dqinfo,
991 .get_dqblk = vfs_get_dqblk,
992 .set_dqblk = vfs_set_dqblk
993};
994#endif
995
ee9b6d61 996static const struct super_operations ext4_sops = {
617ba13b
MC		 997 .alloc_inode = ext4_alloc_inode,
998 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 999 .write_inode = ext4_write_inode,
1000 .dirty_inode = ext4_dirty_inode,
1001 .delete_inode = ext4_delete_inode,
1002 .put_super = ext4_put_super,
617ba13b 1003 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1004 .freeze_fs = ext4_freeze,
1005 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1006 .statfs = ext4_statfs,
1007 .remount_fs = ext4_remount,
1008 .clear_inode = ext4_clear_inode,
1009 .show_options = ext4_show_options,
ac27a0ec 1010#ifdef CONFIG_QUOTA
617ba13b
MC		 1011 .quota_read = ext4_quota_read,
1012 .quota_write = ext4_quota_write,
ac27a0ec 1013#endif
c39a7f84 1014 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1015};
1016
9ca92389
TT		 1017static const struct super_operations ext4_nojournal_sops = {
1018 .alloc_inode = ext4_alloc_inode,
1019 .destroy_inode = ext4_destroy_inode,
1020 .write_inode = ext4_write_inode,
1021 .dirty_inode = ext4_dirty_inode,
1022 .delete_inode = ext4_delete_inode,
1023 .write_super = ext4_write_super,
1024 .put_super = ext4_put_super,
1025 .statfs = ext4_statfs,
1026 .remount_fs = ext4_remount,
1027 .clear_inode = ext4_clear_inode,
1028 .show_options = ext4_show_options,
1029#ifdef CONFIG_QUOTA
1030 .quota_read = ext4_quota_read,
1031 .quota_write = ext4_quota_write,
1032#endif
1033 .bdev_try_to_free_page = bdev_try_to_free_page,
1034};
1035
39655164 1036static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1037 .fh_to_dentry = ext4_fh_to_dentry,
1038 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1039 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1040};
1041
1042enum {
1043 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1044 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1045 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1046 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1047 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1048 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1049 Opt_journal_update, Opt_journal_dev,
818d276c 1050 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1051 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
f4033903 1052 Opt_data_err_abort, Opt_data_err_ignore, Opt_mb_history_length,
ac27a0ec
DK		 1053 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1054 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
06705bff
TT		 1055 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1056 Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1057 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
b3881f74 1058 Opt_inode_readahead_blks, Opt_journal_ioprio
ac27a0ec
DK		 1059};
1060
a447c093 1061static const match_table_t tokens = {
ac27a0ec
DK		 1062 {Opt_bsd_df, "bsddf"},
1063 {Opt_minix_df, "minixdf"},
1064 {Opt_grpid, "grpid"},
1065 {Opt_grpid, "bsdgroups"},
1066 {Opt_nogrpid, "nogrpid"},
1067 {Opt_nogrpid, "sysvgroups"},
1068 {Opt_resgid, "resgid=%u"},
1069 {Opt_resuid, "resuid=%u"},
1070 {Opt_sb, "sb=%u"},
1071 {Opt_err_cont, "errors=continue"},
1072 {Opt_err_panic, "errors=panic"},
1073 {Opt_err_ro, "errors=remount-ro"},
1074 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1075 {Opt_debug, "debug"},
1076 {Opt_oldalloc, "oldalloc"},
1077 {Opt_orlov, "orlov"},
1078 {Opt_user_xattr, "user_xattr"},
1079 {Opt_nouser_xattr, "nouser_xattr"},
1080 {Opt_acl, "acl"},
1081 {Opt_noacl, "noacl"},
ac27a0ec
DK		 1082 {Opt_noload, "noload"},
1083 {Opt_nobh, "nobh"},
1084 {Opt_bh, "bh"},
1085 {Opt_commit, "commit=%u"},
30773840
TT		 1086 {Opt_min_batch_time, "min_batch_time=%u"},
1087 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1088 {Opt_journal_update, "journal=update"},
ac27a0ec 1089 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1090 {Opt_journal_checksum, "journal_checksum"},
1091 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1092 {Opt_abort, "abort"},
1093 {Opt_data_journal, "data=journal"},
1094 {Opt_data_ordered, "data=ordered"},
1095 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1096 {Opt_data_err_abort, "data_err=abort"},
1097 {Opt_data_err_ignore, "data_err=ignore"},
f4033903 1098 {Opt_mb_history_length, "mb_history_length=%u"},
ac27a0ec
DK		 1099 {Opt_offusrjquota, "usrjquota="},
1100 {Opt_usrjquota, "usrjquota=%s"},
1101 {Opt_offgrpjquota, "grpjquota="},
1102 {Opt_grpjquota, "grpjquota=%s"},
1103 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1104 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1105 {Opt_grpquota, "grpquota"},
1106 {Opt_noquota, "noquota"},
1107 {Opt_quota, "quota"},
1108 {Opt_usrquota, "usrquota"},
1109 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1110 {Opt_barrier, "barrier"},
1111 {Opt_nobarrier, "nobarrier"},
25ec56b5 1112 {Opt_i_version, "i_version"},
c9de560d 1113 {Opt_stripe, "stripe=%u"},
ac27a0ec 1114 {Opt_resize, "resize"},
64769240 1115 {Opt_delalloc, "delalloc"},
dd919b98 1116 {Opt_nodelalloc, "nodelalloc"},
240799cd 1117 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1118 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1119 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1120 {Opt_auto_da_alloc, "auto_da_alloc"},
1121 {Opt_noauto_da_alloc, "noauto_da_alloc"},
f3f12faa 1122 {Opt_err, NULL},
ac27a0ec
DK		 1123};
1124
617ba13b 1125static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1126{
617ba13b 1127 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1128 char *options = (char *) *data;
1129
1130 if (!options || strncmp(options, "sb=", 3) != 0)
1131 return 1; /* Default location */
1132 options += 3;
617ba13b 1133 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1134 sb_block = simple_strtoul(options, &options, 0);
1135 if (*options && *options != ',') {
4776004f 1136 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1137 (char *) *data);
1138 return 1;
1139 }
1140 if (*options == ',')
1141 options++;
1142 *data = (void *) options;
1143 return sb_block;
1144}
1145
b3881f74
TT		 1146#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1147
2b2d6d01 1148static int parse_options(char *options, struct super_block *sb,
c3191067 1149 unsigned long *journal_devnum,
b3881f74 1150 unsigned int *journal_ioprio,
2b2d6d01 1151 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1152{
617ba13b 1153 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1154 char *p;
ac27a0ec
DK		 1155 substring_t args[MAX_OPT_ARGS];
1156 int data_opt = 0;
1157 int option;
1158#ifdef CONFIG_QUOTA
dfc5d03f 1159 int qtype, qfmt;
ac27a0ec
DK		 1160 char *qname;
1161#endif
1162
1163 if (!options)
1164 return 1;
1165
2b2d6d01 1166 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1167 int token;
1168 if (!*p)
1169 continue;
1170
1171 token = match_token(p, tokens, args);
1172 switch (token) {
1173 case Opt_bsd_df:
2b2d6d01 1174 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1175 break;
1176 case Opt_minix_df:
2b2d6d01 1177 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1178 break;
1179 case Opt_grpid:
2b2d6d01 1180 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1181 break;
1182 case Opt_nogrpid:
2b2d6d01 1183 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1184 break;
1185 case Opt_resuid:
1186 if (match_int(&args[0], &option))
1187 return 0;
1188 sbi->s_resuid = option;
1189 break;
1190 case Opt_resgid:
1191 if (match_int(&args[0], &option))
1192 return 0;
1193 sbi->s_resgid = option;
1194 break;
1195 case Opt_sb:
1196 /* handled by get_sb_block() instead of here */
1197 /* *sb_block = match_int(&args[0]); */
1198 break;
1199 case Opt_err_panic:
2b2d6d01
TT		 1200 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1201 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1202 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1203 break;
1204 case Opt_err_ro:
2b2d6d01
TT		 1205 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1206 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1207 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1208 break;
1209 case Opt_err_cont:
2b2d6d01
TT		 1210 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1211 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1212 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1213 break;
1214 case Opt_nouid32:
2b2d6d01 1215 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1216 break;
ac27a0ec 1217 case Opt_debug:
2b2d6d01 1218 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1219 break;
1220 case Opt_oldalloc:
2b2d6d01 1221 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1222 break;
1223 case Opt_orlov:
2b2d6d01 1224 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1225 break;
03010a33 1226#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1227 case Opt_user_xattr:
2b2d6d01 1228 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1229 break;
1230 case Opt_nouser_xattr:
2b2d6d01 1231 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1232 break;
1233#else
1234 case Opt_user_xattr:
1235 case Opt_nouser_xattr:
4776004f
TT		 1236 printk(KERN_ERR "EXT4 (no)user_xattr options "
1237 "not supported\n");
ac27a0ec
DK		 1238 break;
1239#endif
03010a33 1240#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1241 case Opt_acl:
1242 set_opt(sbi->s_mount_opt, POSIX_ACL);
1243 break;
1244 case Opt_noacl:
1245 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1246 break;
1247#else
1248 case Opt_acl:
1249 case Opt_noacl:
4776004f
TT		 1250 printk(KERN_ERR "EXT4 (no)acl options "
1251 "not supported\n");
ac27a0ec
DK		 1252 break;
1253#endif
ac27a0ec
DK		 1254 case Opt_journal_update:
1255 /* @@@ FIXME */
1256 /* Eventually we will want to be able to create
1257 a journal file here. For now, only allow the
1258 user to specify an existing inode to be the
1259 journal file. */
1260 if (is_remount) {
617ba13b 1261 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1262 "journal on remount\n");
1263 return 0;
1264 }
2b2d6d01 1265 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1266 break;
ac27a0ec
DK		 1267 case Opt_journal_dev:
1268 if (is_remount) {
617ba13b 1269 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1270 "journal on remount\n");
1271 return 0;
1272 }
1273 if (match_int(&args[0], &option))
1274 return 0;
1275 *journal_devnum = option;
1276 break;
818d276c
GS		 1277 case Opt_journal_checksum:
1278 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1279 break;
1280 case Opt_journal_async_commit:
1281 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1282 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1283 break;
ac27a0ec 1284 case Opt_noload:
2b2d6d01 1285 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1286 break;
1287 case Opt_commit:
1288 if (match_int(&args[0], &option))
1289 return 0;
1290 if (option < 0)
1291 return 0;
1292 if (option == 0)
cd02ff0b 1293 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1294 sbi->s_commit_interval = HZ * option;
1295 break;
30773840
TT		 1296 case Opt_max_batch_time:
1297 if (match_int(&args[0], &option))
1298 return 0;
1299 if (option < 0)
1300 return 0;
1301 if (option == 0)
1302 option = EXT4_DEF_MAX_BATCH_TIME;
1303 sbi->s_max_batch_time = option;
1304 break;
1305 case Opt_min_batch_time:
1306 if (match_int(&args[0], &option))
1307 return 0;
1308 if (option < 0)
1309 return 0;
1310 sbi->s_min_batch_time = option;
1311 break;
ac27a0ec 1312 case Opt_data_journal:
617ba13b 1313 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1314 goto datacheck;
1315 case Opt_data_ordered:
617ba13b 1316 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1317 goto datacheck;
1318 case Opt_data_writeback:
617ba13b 1319 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1320 datacheck:
1321 if (is_remount) {
617ba13b 1322 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1323 != data_opt) {
1324 printk(KERN_ERR
617ba13b 1325 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1326 "mode on remount\n");
1327 return 0;
1328 }
1329 } else {
617ba13b 1330 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1331 sbi->s_mount_opt |= data_opt;
1332 }
1333 break;
5bf5683a
HK		 1334 case Opt_data_err_abort:
1335 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1336 break;
1337 case Opt_data_err_ignore:
1338 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1339 break;
f4033903
CW		 1340 case Opt_mb_history_length:
1341 if (match_int(&args[0], &option))
1342 return 0;
1343 if (option < 0)
1344 return 0;
1345 sbi->s_mb_history_max = option;
1346 break;
ac27a0ec
DK		 1347#ifdef CONFIG_QUOTA
1348 case Opt_usrjquota:
1349 qtype = USRQUOTA;
1350 goto set_qf_name;
1351 case Opt_grpjquota:
1352 qtype = GRPQUOTA;
1353set_qf_name:
17bd13b3 1354 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1355 !sbi->s_qf_names[qtype]) {
ac27a0ec 1356 printk(KERN_ERR
4776004f
TT		 1357 "EXT4-fs: Cannot change journaled "
1358 "quota options when quota turned on.\n");
ac27a0ec
DK		 1359 return 0;
1360 }
1361 qname = match_strdup(&args[0]);
1362 if (!qname) {
1363 printk(KERN_ERR
617ba13b 1364 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1365 "storing quotafile name.\n");
1366 return 0;
1367 }
1368 if (sbi->s_qf_names[qtype] &&
1369 strcmp(sbi->s_qf_names[qtype], qname)) {
1370 printk(KERN_ERR
617ba13b 1371 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1372 "specified.\n", QTYPE2NAME(qtype));
1373 kfree(qname);
1374 return 0;
1375 }
1376 sbi->s_qf_names[qtype] = qname;
1377 if (strchr(sbi->s_qf_names[qtype], '/')) {
1378 printk(KERN_ERR
617ba13b 1379 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1380 "filesystem root.\n");
1381 kfree(sbi->s_qf_names[qtype]);
1382 sbi->s_qf_names[qtype] = NULL;
1383 return 0;
1384 }
1385 set_opt(sbi->s_mount_opt, QUOTA);
1386 break;
1387 case Opt_offusrjquota:
1388 qtype = USRQUOTA;
1389 goto clear_qf_name;
1390 case Opt_offgrpjquota:
1391 qtype = GRPQUOTA;
1392clear_qf_name:
17bd13b3 1393 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1394 sbi->s_qf_names[qtype]) {
617ba13b 1395 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1396 "journaled quota options when "
ac27a0ec
DK		 1397 "quota turned on.\n");
1398 return 0;
1399 }
1400 /*
1401 * The space will be released later when all options
1402 * are confirmed to be correct
1403 */
1404 sbi->s_qf_names[qtype] = NULL;
1405 break;
1406 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1407 qfmt = QFMT_VFS_OLD;
1408 goto set_qf_format;
ac27a0ec 1409 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1410 qfmt = QFMT_VFS_V0;
1411set_qf_format:
17bd13b3 1412 if (sb_any_quota_loaded(sb) &&
dfc5d03f
JK		 1413 sbi->s_jquota_fmt != qfmt) {
1414 printk(KERN_ERR "EXT4-fs: Cannot change "
1415 "journaled quota options when "
1416 "quota turned on.\n");
1417 return 0;
1418 }
1419 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1420 break;
1421 case Opt_quota:
1422 case Opt_usrquota:
1423 set_opt(sbi->s_mount_opt, QUOTA);
1424 set_opt(sbi->s_mount_opt, USRQUOTA);
1425 break;
1426 case Opt_grpquota:
1427 set_opt(sbi->s_mount_opt, QUOTA);
1428 set_opt(sbi->s_mount_opt, GRPQUOTA);
1429 break;
1430 case Opt_noquota:
17bd13b3 1431 if (sb_any_quota_loaded(sb)) {
617ba13b 1432 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1433 "options when quota turned on.\n");
1434 return 0;
1435 }
1436 clear_opt(sbi->s_mount_opt, QUOTA);
1437 clear_opt(sbi->s_mount_opt, USRQUOTA);
1438 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1439 break;
1440#else
1441 case Opt_quota:
1442 case Opt_usrquota:
1443 case Opt_grpquota:
cd59e7b9
JK		 1444 printk(KERN_ERR
1445 "EXT4-fs: quota options not supported.\n");
1446 break;
ac27a0ec
DK		 1447 case Opt_usrjquota:
1448 case Opt_grpjquota:
1449 case Opt_offusrjquota:
1450 case Opt_offgrpjquota:
1451 case Opt_jqfmt_vfsold:
1452 case Opt_jqfmt_vfsv0:
1453 printk(KERN_ERR
cd59e7b9 1454 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1455 "supported.\n");
1456 break;
1457 case Opt_noquota:
1458 break;
1459#endif
1460 case Opt_abort:
1461 set_opt(sbi->s_mount_opt, ABORT);
1462 break;
06705bff
TT		 1463 case Opt_nobarrier:
1464 clear_opt(sbi->s_mount_opt, BARRIER);
1465 break;
ac27a0ec 1466 case Opt_barrier:
06705bff
TT		 1467 if (match_int(&args[0], &option)) {
1468 set_opt(sbi->s_mount_opt, BARRIER);
1469 break;
1470 }
ac27a0ec
DK		 1471 if (option)
1472 set_opt(sbi->s_mount_opt, BARRIER);
1473 else
1474 clear_opt(sbi->s_mount_opt, BARRIER);
1475 break;
1476 case Opt_ignore:
1477 break;
1478 case Opt_resize:
1479 if (!is_remount) {
617ba13b 1480 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1481 "for remount\n");
1482 return 0;
1483 }
1484 if (match_int(&args[0], &option) != 0)
1485 return 0;
1486 *n_blocks_count = option;
1487 break;
1488 case Opt_nobh:
1489 set_opt(sbi->s_mount_opt, NOBH);
1490 break;
1491 case Opt_bh:
1492 clear_opt(sbi->s_mount_opt, NOBH);
1493 break;
25ec56b5
JNC		 1494 case Opt_i_version:
1495 set_opt(sbi->s_mount_opt, I_VERSION);
1496 sb->s_flags |= MS_I_VERSION;
1497 break;
dd919b98
AK		 1498 case Opt_nodelalloc:
1499 clear_opt(sbi->s_mount_opt, DELALLOC);
1500 break;
c9de560d
AT		 1501 case Opt_stripe:
1502 if (match_int(&args[0], &option))
1503 return 0;
1504 if (option < 0)
1505 return 0;
1506 sbi->s_stripe = option;
1507 break;
64769240
AT		 1508 case Opt_delalloc:
1509 set_opt(sbi->s_mount_opt, DELALLOC);
1510 break;
240799cd
TT		 1511 case Opt_inode_readahead_blks:
1512 if (match_int(&args[0], &option))
1513 return 0;
1514 if (option < 0 || option > (1 << 30))
1515 return 0;
f7c43950 1516 if (!is_power_of_2(option)) {
3197ebdb
TT		 1517 printk(KERN_ERR "EXT4-fs: inode_readahead_blks"
1518 " must be a power of 2\n");
1519 return 0;
1520 }
240799cd
TT		 1521 sbi->s_inode_readahead_blks = option;
1522 break;
b3881f74
TT		 1523 case Opt_journal_ioprio:
1524 if (match_int(&args[0], &option))
1525 return 0;
1526 if (option < 0 || option > 7)
1527 break;
1528 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1529 option);
1530 break;
06705bff
TT		 1531 case Opt_noauto_da_alloc:
1532 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1533 break;
afd4672d 1534 case Opt_auto_da_alloc:
06705bff
TT		 1535 if (match_int(&args[0], &option)) {
1536 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1537 break;
1538 }
afd4672d
TT		 1539 if (option)
1540 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1541 else
1542 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1543 break;
ac27a0ec 1544 default:
2b2d6d01
TT		 1545 printk(KERN_ERR
1546 "EXT4-fs: Unrecognized mount option \"%s\" "
1547 "or missing value\n", p);
ac27a0ec
DK		 1548 return 0;
1549 }
1550 }
1551#ifdef CONFIG_QUOTA
1552 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1553 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1554 sbi->s_qf_names[USRQUOTA])
1555 clear_opt(sbi->s_mount_opt, USRQUOTA);
1556
617ba13b 1557 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1558 sbi->s_qf_names[GRPQUOTA])
1559 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1560
1561 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1562 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1563 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1564 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1565 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1566 "format mixing.\n");
1567 return 0;
1568 }
1569
1570 if (!sbi->s_jquota_fmt) {
2c8be6b2 1571 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1572 "not specified.\n");
1573 return 0;
1574 }
1575 } else {
1576 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1577 printk(KERN_ERR "EXT4-fs: journaled quota format "
1578 "specified with no journaling "
ac27a0ec
DK		 1579 "enabled.\n");
1580 return 0;
1581 }
1582 }
1583#endif
1584 return 1;
1585}
1586
617ba13b 1587static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1588 int read_only)
1589{
617ba13b 1590 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1591 int res = 0;
1592
617ba13b 1593 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1594 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1595 "forcing read-only mode\n");
ac27a0ec
DK		 1596 res = MS_RDONLY;
1597 }
1598 if (read_only)
1599 return res;
617ba13b 1600 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1601 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1602 "running e2fsck is recommended\n");
617ba13b 1603 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1604 printk(KERN_WARNING
1605 "EXT4-fs warning: mounting fs with errors, "
1606 "running e2fsck is recommended\n");
ac27a0ec
DK		 1607 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1608 le16_to_cpu(es->s_mnt_count) >=
1609 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1610 printk(KERN_WARNING
1611 "EXT4-fs warning: maximal mount count reached, "
1612 "running e2fsck is recommended\n");
ac27a0ec
DK		 1613 else if (le32_to_cpu(es->s_checkinterval) &&
1614 (le32_to_cpu(es->s_lastcheck) +
1615 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1616 printk(KERN_WARNING
1617 "EXT4-fs warning: checktime reached, "
1618 "running e2fsck is recommended\n");
0390131b
FM		 1619 if (!sbi->s_journal)
1620 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1621 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1622 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1623 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1624 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1625 ext4_update_dynamic_rev(sb);
0390131b
FM		 1626 if (sbi->s_journal)
1627 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1628
e2d67052 1629 ext4_commit_super(sb, 1);
ac27a0ec 1630 if (test_opt(sb, DEBUG))
a9df9a49 1631 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
ac27a0ec
DK		 1632 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1633 sb->s_blocksize,
1634 sbi->s_groups_count,
617ba13b
MC		 1635 EXT4_BLOCKS_PER_GROUP(sb),
1636 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1637 sbi->s_mount_opt);
1638
0390131b
FM		 1639 if (EXT4_SB(sb)->s_journal) {
1640 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1641 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1642 "external", EXT4_SB(sb)->s_journal->j_devname);
1643 } else {
1644 printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
1645 }
ac27a0ec
DK		 1646 return res;
1647}
1648
772cb7c8
JS		 1649static int ext4_fill_flex_info(struct super_block *sb)
1650{
1651 struct ext4_sb_info *sbi = EXT4_SB(sb);
1652 struct ext4_group_desc *gdp = NULL;
1653 struct buffer_head *bh;
1654 ext4_group_t flex_group_count;
1655 ext4_group_t flex_group;
1656 int groups_per_flex = 0;
c5ca7c76 1657 size_t size;
772cb7c8
JS		 1658 int i;
1659
1660 if (!sbi->s_es->s_log_groups_per_flex) {
1661 sbi->s_log_groups_per_flex = 0;
1662 return 1;
1663 }
1664
1665 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1666 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1667
c62a11fd
FB		 1668 /* We allocate both existing and potentially added groups */
1669 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1670 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1671 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1672 size = flex_group_count * sizeof(struct flex_groups);
1673 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1674 if (sbi->s_flex_groups == NULL) {
1675 sbi->s_flex_groups = vmalloc(size);
1676 if (sbi->s_flex_groups)
1677 memset(sbi->s_flex_groups, 0, size);
1678 }
772cb7c8 1679 if (sbi->s_flex_groups == NULL) {
ec05e868 1680 printk(KERN_ERR "EXT4-fs: not enough memory for "
a9df9a49 1681 "%u flex groups\n", flex_group_count);
772cb7c8
JS		 1682 goto failed;
1683 }
772cb7c8 1684
772cb7c8
JS		 1685 for (i = 0; i < sbi->s_groups_count; i++) {
1686 gdp = ext4_get_group_desc(sb, i, &bh);
1687
1688 flex_group = ext4_flex_group(sbi, i);
9f24e420
TT		 1689 atomic_set(&sbi->s_flex_groups[flex_group].free_inodes,
1690 ext4_free_inodes_count(sb, gdp));
1691 atomic_set(&sbi->s_flex_groups[flex_group].free_blocks,
1692 ext4_free_blks_count(sb, gdp));
7d39db14
TT		 1693 atomic_set(&sbi->s_flex_groups[flex_group].used_dirs,
1694 ext4_used_dirs_count(sb, gdp));
772cb7c8
JS		 1695 }
1696
1697 return 1;
1698failed:
1699 return 0;
1700}
1701
717d50e4
AD		 1702__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1703 struct ext4_group_desc *gdp)
1704{
1705 __u16 crc = 0;
1706
1707 if (sbi->s_es->s_feature_ro_compat &
1708 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1709 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1710 __le32 le_group = cpu_to_le32(block_group);
1711
1712 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1713 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1714 crc = crc16(crc, (__u8 *)gdp, offset);
1715 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1716 /* for checksum of struct ext4_group_desc do the rest...*/
1717 if ((sbi->s_es->s_feature_incompat &
1718 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1719 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1720 crc = crc16(crc, (__u8 *)gdp + offset,
1721 le16_to_cpu(sbi->s_es->s_desc_size) -
1722 offset);
1723 }
1724
1725 return cpu_to_le16(crc);
1726}
1727
1728int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1729 struct ext4_group_desc *gdp)
1730{
1731 if ((sbi->s_es->s_feature_ro_compat &
1732 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1733 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1734 return 0;
1735
1736 return 1;
1737}
1738
ac27a0ec 1739/* Called at mount-time, super-block is locked */
197cd65a 1740static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1741{
617ba13b
MC		 1742 struct ext4_sb_info *sbi = EXT4_SB(sb);
1743 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1744 ext4_fsblk_t last_block;
bd81d8ee
LV		 1745 ext4_fsblk_t block_bitmap;
1746 ext4_fsblk_t inode_bitmap;
1747 ext4_fsblk_t inode_table;
ce421581 1748 int flexbg_flag = 0;
fd2d4291 1749 ext4_group_t i;
ac27a0ec 1750
ce421581
JS		 1751 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1752 flexbg_flag = 1;
1753
af5bc92d 1754 ext4_debug("Checking group descriptors");
ac27a0ec 1755
197cd65a
AM		 1756 for (i = 0; i < sbi->s_groups_count; i++) {
1757 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1758
ce421581 1759 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1760 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1761 else
1762 last_block = first_block +
617ba13b 1763 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1764
8fadc143 1765 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1766 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0 1767 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1768 "Block bitmap for group %u not in group "
5128273a 1769 "(block %llu)!\n", i, block_bitmap);
ac27a0ec
DK		 1770 return 0;
1771 }
8fadc143 1772 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1773 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0 1774 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1775 "Inode bitmap for group %u not in group "
5128273a 1776 "(block %llu)!\n", i, inode_bitmap);
ac27a0ec
DK		 1777 return 0;
1778 }
8fadc143 1779 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1780 if (inode_table < first_block ||
2b2d6d01 1781 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0 1782 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1783 "Inode table for group %u not in group "
5128273a 1784 "(block %llu)!\n", i, inode_table);
ac27a0ec
DK		 1785 return 0;
1786 }
955ce5f5 1787 ext4_lock_group(sb, i);
717d50e4 1788 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0 1789 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1790 "Checksum for group %u failed (%u!=%u)\n",
c19204b0
JB		 1791 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1792 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1793 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1794 ext4_unlock_group(sb, i);
8a266467 1795 return 0;
7ee1ec4c 1796 }
717d50e4 1797 }
955ce5f5 1798 ext4_unlock_group(sb, i);
ce421581
JS		 1799 if (!flexbg_flag)
1800 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1801 }
1802
bd81d8ee 1803 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1804 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1805 return 1;
1806}
1807
617ba13b 1808/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1809 * the superblock) which were deleted from all directories, but held open by
1810 * a process at the time of a crash. We walk the list and try to delete these
1811 * inodes at recovery time (only with a read-write filesystem).
1812 *
1813 * In order to keep the orphan inode chain consistent during traversal (in
1814 * case of crash during recovery), we link each inode into the superblock
1815 * orphan list_head and handle it the same way as an inode deletion during
1816 * normal operation (which journals the operations for us).
1817 *
1818 * We only do an iget() and an iput() on each inode, which is very safe if we
1819 * accidentally point at an in-use or already deleted inode. The worst that
1820 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1821 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1822 * e2fsck was run on this filesystem, and it must have already done the orphan
1823 * inode cleanup for us, so we can safely abort without any further action.
1824 */
2b2d6d01
TT		 1825static void ext4_orphan_cleanup(struct super_block *sb,
1826 struct ext4_super_block *es)
ac27a0ec
DK		 1827{
1828 unsigned int s_flags = sb->s_flags;
1829 int nr_orphans = 0, nr_truncates = 0;
1830#ifdef CONFIG_QUOTA
1831 int i;
1832#endif
1833 if (!es->s_last_orphan) {
1834 jbd_debug(4, "no orphan inodes to clean up\n");
1835 return;
1836 }
1837
a8f48a95
ES		 1838 if (bdev_read_only(sb->s_bdev)) {
1839 printk(KERN_ERR "EXT4-fs: write access "
1840 "unavailable, skipping orphan cleanup.\n");
1841 return;
1842 }
1843
617ba13b 1844 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1845 if (es->s_last_orphan)
1846 jbd_debug(1, "Errors on filesystem, "
1847 "clearing orphan list.\n");
1848 es->s_last_orphan = 0;
1849 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1850 return;
1851 }
1852
1853 if (s_flags & MS_RDONLY) {
617ba13b 1854 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1855 sb->s_id);
1856 sb->s_flags &= ~MS_RDONLY;
1857 }
1858#ifdef CONFIG_QUOTA
1859 /* Needed for iput() to work correctly and not trash data */
1860 sb->s_flags |= MS_ACTIVE;
1861 /* Turn on quotas so that they are updated correctly */
1862 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1863 if (EXT4_SB(sb)->s_qf_names[i]) {
1864 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1865 if (ret < 0)
1866 printk(KERN_ERR
2c8be6b2 1867 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1868 "quota: error %d\n", ret);
1869 }
1870 }
1871#endif
1872
1873 while (es->s_last_orphan) {
1874 struct inode *inode;
1875
97bd42b9
JB		 1876 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1877 if (IS_ERR(inode)) {
ac27a0ec
DK		 1878 es->s_last_orphan = 0;
1879 break;
1880 }
1881
617ba13b 1882 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
a269eb18 1883 vfs_dq_init(inode);
ac27a0ec
DK		 1884 if (inode->i_nlink) {
1885 printk(KERN_DEBUG
e5f8eab8 1886 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1887 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1888 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1889 inode->i_ino, inode->i_size);
617ba13b 1890 ext4_truncate(inode);
ac27a0ec
DK		 1891 nr_truncates++;
1892 } else {
1893 printk(KERN_DEBUG
1894 "%s: deleting unreferenced inode %lu\n",
46e665e9 1895 __func__, inode->i_ino);
ac27a0ec
DK		 1896 jbd_debug(2, "deleting unreferenced inode %lu\n",
1897 inode->i_ino);
1898 nr_orphans++;
1899 }
1900 iput(inode); /* The delete magic happens here! */
1901 }
1902
2b2d6d01 1903#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1904
1905 if (nr_orphans)
617ba13b 1906 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1907 sb->s_id, PLURAL(nr_orphans));
1908 if (nr_truncates)
617ba13b 1909 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1910 sb->s_id, PLURAL(nr_truncates));
1911#ifdef CONFIG_QUOTA
1912 /* Turn quotas off */
1913 for (i = 0; i < MAXQUOTAS; i++) {
1914 if (sb_dqopt(sb)->files[i])
6f28e087 1915 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1916 }
1917#endif
1918 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1919}
cd2291a4
ES		 1920/*
1921 * Maximal extent format file size.
1922 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1923 * extent format containers, within a sector_t, and within i_blocks
1924 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1925 * so that won't be a limiting factor.
1926 *
1927 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1928 */
f287a1a5 1929static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1930{
1931 loff_t res;
1932 loff_t upper_limit = MAX_LFS_FILESIZE;
1933
1934 /* small i_blocks in vfs inode? */
f287a1a5 1935 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 1936 /*
b3a6ffe1 1937 * CONFIG_LBD is not enabled implies the inode
cd2291a4
ES		 1938 * i_block represent total blocks in 512 bytes
1939 * 32 == size of vfs inode i_blocks * 8
1940 */
1941 upper_limit = (1LL << 32) - 1;
1942
1943 /* total blocks in file system block size */
1944 upper_limit >>= (blkbits - 9);
1945 upper_limit <<= blkbits;
1946 }
1947
1948 /* 32-bit extent-start container, ee_block */
1949 res = 1LL << 32;
1950 res <<= blkbits;
1951 res -= 1;
1952
1953 /* Sanity check against vm- & vfs- imposed limits */
1954 if (res > upper_limit)
1955 res = upper_limit;
1956
1957 return res;
1958}
ac27a0ec 1959
ac27a0ec 1960/*
cd2291a4 1961 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1962 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1963 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1964 */
f287a1a5 1965static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 1966{
617ba13b 1967 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1968 int meta_blocks;
1969 loff_t upper_limit;
1970 /* This is calculated to be the largest file size for a
cd2291a4 1971 * dense, bitmapped file such that the total number of
ac27a0ec 1972 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1973 * does not exceed 2^48 -1
1974 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1975 * total number of 512 bytes blocks of the file
1976 */
1977
f287a1a5 1978 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 1979 /*
b3a6ffe1 1980 * !has_huge_files or CONFIG_LBD is not enabled
f287a1a5
TT		 1981 * implies the inode i_block represent total blocks in
1982 * 512 bytes 32 == size of vfs inode i_blocks * 8
0fc1b451
AK		 1983 */
1984 upper_limit = (1LL << 32) - 1;
1985
1986 /* total blocks in file system block size */
1987 upper_limit >>= (bits - 9);
1988
1989 } else {
8180a562
AK		 1990 /*
1991 * We use 48 bit ext4_inode i_blocks
1992 * With EXT4_HUGE_FILE_FL set the i_blocks
1993 * represent total number of blocks in
1994 * file system block size
1995 */
0fc1b451
AK		 1996 upper_limit = (1LL << 48) - 1;
1997
0fc1b451
AK		 1998 }
1999
2000 /* indirect blocks */
2001 meta_blocks = 1;
2002 /* double indirect blocks */
2003 meta_blocks += 1 + (1LL << (bits-2));
2004 /* tripple indirect blocks */
2005 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2006
2007 upper_limit -= meta_blocks;
2008 upper_limit <<= bits;
ac27a0ec
DK		 2009
2010 res += 1LL << (bits-2);
2011 res += 1LL << (2*(bits-2));
2012 res += 1LL << (3*(bits-2));
2013 res <<= bits;
2014 if (res > upper_limit)
2015 res = upper_limit;
0fc1b451
AK		 2016
2017 if (res > MAX_LFS_FILESIZE)
2018 res = MAX_LFS_FILESIZE;
2019
ac27a0ec
DK		 2020 return res;
2021}
2022
617ba13b 2023static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 2024 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2025{
617ba13b 2026 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2027 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2028 int has_super = 0;
2029
2030 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2031
617ba13b 2032 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2033 nr < first_meta_bg)
70bbb3e0 2034 return logical_sb_block + nr + 1;
ac27a0ec 2035 bg = sbi->s_desc_per_block * nr;
617ba13b 2036 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2037 has_super = 1;
617ba13b 2038 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2039}
2040
c9de560d
AT		 2041/**
2042 * ext4_get_stripe_size: Get the stripe size.
2043 * @sbi: In memory super block info
2044 *
2045 * If we have specified it via mount option, then
2046 * use the mount option value. If the value specified at mount time is
2047 * greater than the blocks per group use the super block value.
2048 * If the super block value is greater than blocks per group return 0.
2049 * Allocator needs it be less than blocks per group.
2050 *
2051 */
2052static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2053{
2054 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2055 unsigned long stripe_width =
2056 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2057
2058 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2059 return sbi->s_stripe;
2060
2061 if (stripe_width <= sbi->s_blocks_per_group)
2062 return stripe_width;
2063
2064 if (stride <= sbi->s_blocks_per_group)
2065 return stride;
2066
2067 return 0;
2068}
ac27a0ec 2069
3197ebdb
TT		 2070/* sysfs supprt */
2071
2072struct ext4_attr {
2073 struct attribute attr;
2074 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2075 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2076 const char *, size_t);
2077 int offset;
2078};
2079
2080static int parse_strtoul(const char *buf,
2081 unsigned long max, unsigned long *value)
2082{
2083 char *endp;
2084
2085 while (*buf && isspace(*buf))
2086 buf++;
2087 *value = simple_strtoul(buf, &endp, 0);
2088 while (*endp && isspace(*endp))
2089 endp++;
2090 if (*endp || *value > max)
2091 return -EINVAL;
2092
2093 return 0;
2094}
2095
2096static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2097 struct ext4_sb_info *sbi,
2098 char *buf)
2099{
2100 return snprintf(buf, PAGE_SIZE, "%llu\n",
2101 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2102}
2103
2104static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2105 struct ext4_sb_info *sbi, char *buf)
2106{
2107 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2108
2109 return snprintf(buf, PAGE_SIZE, "%lu\n",
2110 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2111 sbi->s_sectors_written_start) >> 1);
2112}
2113
2114static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2115 struct ext4_sb_info *sbi, char *buf)
2116{
2117 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2118
2119 return snprintf(buf, PAGE_SIZE, "%llu\n",
2120 sbi->s_kbytes_written +
2121 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2122 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2123}
2124
2125static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2126 struct ext4_sb_info *sbi,
2127 const char *buf, size_t count)
2128{
2129 unsigned long t;
2130
2131 if (parse_strtoul(buf, 0x40000000, &t))
2132 return -EINVAL;
2133
f7c43950 2134 if (!is_power_of_2(t))
3197ebdb
TT		 2135 return -EINVAL;
2136
2137 sbi->s_inode_readahead_blks = t;
2138 return count;
2139}
2140
2141static ssize_t sbi_ui_show(struct ext4_attr *a,
2142 struct ext4_sb_info *sbi, char *buf)
2143{
2144 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2145
2146 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2147}
2148
2149static ssize_t sbi_ui_store(struct ext4_attr *a,
2150 struct ext4_sb_info *sbi,
2151 const char *buf, size_t count)
2152{
2153 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2154 unsigned long t;
2155
2156 if (parse_strtoul(buf, 0xffffffff, &t))
2157 return -EINVAL;
2158 *ui = t;
2159 return count;
2160}
2161
2162#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2163static struct ext4_attr ext4_attr_##_name = { \
2164 .attr = {.name = __stringify(_name), .mode = _mode }, \
2165 .show = _show, \
2166 .store = _store, \
2167 .offset = offsetof(struct ext4_sb_info, _elname), \
2168}
2169#define EXT4_ATTR(name, mode, show, store) \
2170static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2171
2172#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2173#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2174#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2175 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2176#define ATTR_LIST(name) &ext4_attr_##name.attr
2177
2178EXT4_RO_ATTR(delayed_allocation_blocks);
2179EXT4_RO_ATTR(session_write_kbytes);
2180EXT4_RO_ATTR(lifetime_write_kbytes);
2181EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2182 inode_readahead_blks_store, s_inode_readahead_blks);
2183EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2184EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2185EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2186EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2187EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2188EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2189
2190static struct attribute *ext4_attrs[] = {
2191 ATTR_LIST(delayed_allocation_blocks),
2192 ATTR_LIST(session_write_kbytes),
2193 ATTR_LIST(lifetime_write_kbytes),
2194 ATTR_LIST(inode_readahead_blks),
2195 ATTR_LIST(mb_stats),
2196 ATTR_LIST(mb_max_to_scan),
2197 ATTR_LIST(mb_min_to_scan),
2198 ATTR_LIST(mb_order2_req),
2199 ATTR_LIST(mb_stream_req),
2200 ATTR_LIST(mb_group_prealloc),
2201 NULL,
2202};
2203
2204static ssize_t ext4_attr_show(struct kobject *kobj,
2205 struct attribute *attr, char *buf)
2206{
2207 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2208 s_kobj);
2209 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2210
2211 return a->show ? a->show(a, sbi, buf) : 0;
2212}
2213
2214static ssize_t ext4_attr_store(struct kobject *kobj,
2215 struct attribute *attr,
2216 const char *buf, size_t len)
2217{
2218 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2219 s_kobj);
2220 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2221
2222 return a->store ? a->store(a, sbi, buf, len) : 0;
2223}
2224
2225static void ext4_sb_release(struct kobject *kobj)
2226{
2227 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2228 s_kobj);
2229 complete(&sbi->s_kobj_unregister);
2230}
2231
2232
2233static struct sysfs_ops ext4_attr_ops = {
2234 .show = ext4_attr_show,
2235 .store = ext4_attr_store,
2236};
2237
2238static struct kobj_type ext4_ktype = {
2239 .default_attrs = ext4_attrs,
2240 .sysfs_ops = &ext4_attr_ops,
2241 .release = ext4_sb_release,
2242};
2243
2b2d6d01 2244static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2245 __releases(kernel_lock)
2246 __acquires(kernel_lock)
1d03ec98 2247
ac27a0ec 2248{
2b2d6d01 2249 struct buffer_head *bh;
617ba13b
MC		 2250 struct ext4_super_block *es = NULL;
2251 struct ext4_sb_info *sbi;
2252 ext4_fsblk_t block;
2253 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2254 ext4_fsblk_t logical_sb_block;
ac27a0ec 2255 unsigned long offset = 0;
ac27a0ec
DK		 2256 unsigned long journal_devnum = 0;
2257 unsigned long def_mount_opts;
2258 struct inode *root;
9f6200bb 2259 char *cp;
0390131b 2260 const char *descr;
1d1fe1ee 2261 int ret = -EINVAL;
ac27a0ec 2262 int blocksize;
4ec11028
TT		 2263 unsigned int db_count;
2264 unsigned int i;
f287a1a5 2265 int needs_recovery, has_huge_files;
3a06d778 2266 int features;
bd81d8ee 2267 __u64 blocks_count;
833f4077 2268 int err;
b3881f74 2269 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2270
2271 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2272 if (!sbi)
2273 return -ENOMEM;
705895b6
PE		 2274
2275 sbi->s_blockgroup_lock =
2276 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2277 if (!sbi->s_blockgroup_lock) {
2278 kfree(sbi);
2279 return -ENOMEM;
2280 }
ac27a0ec
DK		 2281 sb->s_fs_info = sbi;
2282 sbi->s_mount_opt = 0;
617ba13b
MC		 2283 sbi->s_resuid = EXT4_DEF_RESUID;
2284 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2285 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2286 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2287 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2288 sectors[1]);
ac27a0ec
DK		 2289
2290 unlock_kernel();
2291
9f6200bb
TT		 2292 /* Cleanup superblock name */
2293 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2294 *cp = '!';
2295
617ba13b 2296 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2297 if (!blocksize) {
617ba13b 2298 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 2299 goto out_fail;
2300 }
2301
2302 /*
617ba13b 2303 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2304 * block sizes. We need to calculate the offset from buffer start.
2305 */
617ba13b 2306 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2307 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2308 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2309 } else {
70bbb3e0 2310 logical_sb_block = sb_block;
ac27a0ec
DK		 2311 }
2312
70bbb3e0 2313 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 2314 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 2315 goto out_fail;
2316 }
2317 /*
2318 * Note: s_es must be initialized as soon as possible because
617ba13b 2319 * some ext4 macro-instructions depend on its value
ac27a0ec 2320 */
617ba13b 2321 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2322 sbi->s_es = es;
2323 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2324 if (sb->s_magic != EXT4_SUPER_MAGIC)
2325 goto cantfind_ext4;
afc32f7e 2326 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2327
2328 /* Set defaults before we parse the mount options */
2329 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2330 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2331 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2332 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2333 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2334 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2335 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2336#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2337 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2338 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2339#endif
03010a33 2340#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2341 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2342 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2343#endif
617ba13b
MC		 2344 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2345 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2346 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2347 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2348 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2349 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2350
2351 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2352 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2353 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2354 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2355 else
2356 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2357
2358 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2359 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2360 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2361 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2362 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
f4033903 2363 sbi->s_mb_history_max = default_mb_history_length;
ac27a0ec 2364
571640ca 2365 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2366
dd919b98
AK		 2367 /*
2368 * enable delayed allocation by default
2369 * Use -o nodelalloc to turn it off
2370 */
2371 set_opt(sbi->s_mount_opt, DELALLOC);
2372
2373
b3881f74
TT		 2374 if (!parse_options((char *) data, sb, &journal_devnum,
2375 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2376 goto failed_mount;
2377
2378 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2379 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2380
617ba13b
MC		 2381 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2382 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2383 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2384 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2385 printk(KERN_WARNING
617ba13b 2386 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2387 "running e2fsck is recommended\n");
469108ff 2388
ac27a0ec
DK		 2389 /*
2390 * Check feature flags regardless of the revision level, since we
2391 * previously didn't change the revision level when setting the flags,
2392 * so there is a chance incompat flags are set on a rev 0 filesystem.
2393 */
617ba13b 2394 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2395 if (features) {
617ba13b 2396 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
3a06d778
AK		 2397 "unsupported optional features (%x).\n", sb->s_id,
2398 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2399 ~EXT4_FEATURE_INCOMPAT_SUPP));
ac27a0ec
DK		 2400 goto failed_mount;
2401 }
617ba13b 2402 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2403 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2404 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
3a06d778
AK		 2405 "unsupported optional features (%x).\n", sb->s_id,
2406 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2407 ~EXT4_FEATURE_RO_COMPAT_SUPP));
ac27a0ec
DK		 2408 goto failed_mount;
2409 }
f287a1a5
TT		 2410 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2411 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2412 if (has_huge_files) {
0fc1b451
AK		 2413 /*
2414 * Large file size enabled file system can only be
b3a6ffe1 2415 * mount if kernel is build with CONFIG_LBD
0fc1b451
AK		 2416 */
2417 if (sizeof(root->i_blocks) < sizeof(u64) &&
2418 !(sb->s_flags & MS_RDONLY)) {
2419 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2420 "files cannot be mounted read-write "
b3a6ffe1 2421 "without CONFIG_LBD.\n", sb->s_id);
0fc1b451
AK		 2422 goto failed_mount;
2423 }
2424 }
ac27a0ec
DK		 2425 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2426
617ba13b
MC		 2427 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2428 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2429 printk(KERN_ERR
617ba13b 2430 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2431 blocksize, sb->s_id);
2432 goto failed_mount;
2433 }
2434
ac27a0ec 2435 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2436
2437 /* Validate the filesystem blocksize */
2438 if (!sb_set_blocksize(sb, blocksize)) {
2439 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2440 blocksize);
ac27a0ec
DK		 2441 goto failed_mount;
2442 }
2443
2b2d6d01 2444 brelse(bh);
70bbb3e0
AM		 2445 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2446 offset = do_div(logical_sb_block, blocksize);
2447 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2448 if (!bh) {
2449 printk(KERN_ERR
617ba13b 2450 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2451 goto failed_mount;
2452 }
617ba13b 2453 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2454 sbi->s_es = es;
617ba13b 2455 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2456 printk(KERN_ERR
2457 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2458 goto failed_mount;
2459 }
2460 }
2461
f287a1a5
TT		 2462 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2463 has_huge_files);
2464 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2465
617ba13b
MC		 2466 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2467 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2468 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2469 } else {
2470 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2471 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2472 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2473 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2474 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2475 printk(KERN_ERR
2476 "EXT4-fs: unsupported inode size: %d\n",
2477 sbi->s_inode_size);
ac27a0ec
DK		 2478 goto failed_mount;
2479 }
ef7f3835
KS		 2480 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2481 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2482 }
0d1ee42f
AR		 2483 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2484 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2485 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2486 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2487 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2488 printk(KERN_ERR
8fadc143 2489 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2490 sbi->s_desc_size);
2491 goto failed_mount;
2492 }
2493 } else
2494 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2495 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2496 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2497 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2498 goto cantfind_ext4;
2499 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2500 if (sbi->s_inodes_per_block == 0)
617ba13b 2501 goto cantfind_ext4;
ac27a0ec
DK		 2502 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2503 sbi->s_inodes_per_block;
0d1ee42f 2504 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2505 sbi->s_sbh = bh;
2506 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2507 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2508 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2509 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2510 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2511 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2512 i = le32_to_cpu(es->s_flags);
2513 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2514 sbi->s_hash_unsigned = 3;
2515 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2516#ifdef __CHAR_UNSIGNED__
2517 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2518 sbi->s_hash_unsigned = 3;
2519#else
2520 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2521#endif
2522 sb->s_dirt = 1;
2523 }
ac27a0ec
DK		 2524
2525 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2526 printk(KERN_ERR
2527 "EXT4-fs: #blocks per group too big: %lu\n",
2528 sbi->s_blocks_per_group);
ac27a0ec
DK		 2529 goto failed_mount;
2530 }
ac27a0ec 2531 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2532 printk(KERN_ERR
2533 "EXT4-fs: #inodes per group too big: %lu\n",
2534 sbi->s_inodes_per_group);
ac27a0ec
DK		 2535 goto failed_mount;
2536 }
2537
bd81d8ee 2538 if (ext4_blocks_count(es) >
ac27a0ec 2539 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2540 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2541 " too large to mount safely\n", sb->s_id);
2542 if (sizeof(sector_t) < 8)
617ba13b 2543 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2544 "enabled\n");
2545 goto failed_mount;
2546 }
2547
617ba13b
MC		 2548 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2549 goto cantfind_ext4;
e7c95593 2550
0f2ddca6
FTN		 2551 /* check blocks count against device size */
2552 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2553 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2554 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu "
2555 "exceeds size of device (%llu blocks)\n",
2556 ext4_blocks_count(es), blocks_count);
2557 goto failed_mount;
2558 }
2559
4ec11028
TT		 2560 /*
2561 * It makes no sense for the first data block to be beyond the end
2562 * of the filesystem.
2563 */
2564 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2565 printk(KERN_WARNING "EXT4-fs: bad geometry: first data"
2566 "block %u is beyond end of filesystem (%llu)\n",
2567 le32_to_cpu(es->s_first_data_block),
2568 ext4_blocks_count(es));
e7c95593
ES		 2569 goto failed_mount;
2570 }
bd81d8ee
LV		 2571 blocks_count = (ext4_blocks_count(es) -
2572 le32_to_cpu(es->s_first_data_block) +
2573 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2574 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028
TT		 2575 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2576 printk(KERN_WARNING "EXT4-fs: groups count too large: %u "
2577 "(block count %llu, first data block %u, "
2578 "blocks per group %lu)\n", sbi->s_groups_count,
2579 ext4_blocks_count(es),
2580 le32_to_cpu(es->s_first_data_block),
2581 EXT4_BLOCKS_PER_GROUP(sb));
2582 goto failed_mount;
2583 }
bd81d8ee 2584 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2585 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2586 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2587 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2588 GFP_KERNEL);
2589 if (sbi->s_group_desc == NULL) {
2b2d6d01 2590 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2591 goto failed_mount;
2592 }
2593
3244fcb1 2594#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2595 if (ext4_proc_root)
2596 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2597#endif
240799cd 2598
705895b6 2599 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2600
2601 for (i = 0; i < db_count; i++) {
70bbb3e0 2602 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2603 sbi->s_group_desc[i] = sb_bread(sb, block);
2604 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2605 printk(KERN_ERR "EXT4-fs: "
2606 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2607 db_count = i;
2608 goto failed_mount2;
2609 }
2610 }
2b2d6d01 2611 if (!ext4_check_descriptors(sb)) {
617ba13b 2612 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2613 goto failed_mount2;
2614 }
772cb7c8
JS		 2615 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2616 if (!ext4_fill_flex_info(sb)) {
2617 printk(KERN_ERR
2618 "EXT4-fs: unable to initialize "
2619 "flex_bg meta info!\n");
2620 goto failed_mount2;
2621 }
2622
ac27a0ec
DK		 2623 sbi->s_gdb_count = db_count;
2624 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2625 spin_lock_init(&sbi->s_next_gen_lock);
2626
833f4077
PZ		 2627 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2628 ext4_count_free_blocks(sb));
2629 if (!err) {
2630 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2631 ext4_count_free_inodes(sb));
2632 }
2633 if (!err) {
2634 err = percpu_counter_init(&sbi->s_dirs_counter,
2635 ext4_count_dirs(sb));
2636 }
6bc6e63f
AK		 2637 if (!err) {
2638 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2639 }
833f4077
PZ		 2640 if (err) {
2641 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2642 goto failed_mount3;
2643 }
ac27a0ec 2644
c9de560d
AT		 2645 sbi->s_stripe = ext4_get_stripe_size(sbi);
2646
ac27a0ec
DK		 2647 /*
2648 * set up enough so that it can read an inode
2649 */
9ca92389
TT		 2650 if (!test_opt(sb, NOLOAD) &&
2651 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2652 sb->s_op = &ext4_sops;
2653 else
2654 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2655 sb->s_export_op = &ext4_export_ops;
2656 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2657#ifdef CONFIG_QUOTA
617ba13b
MC		 2658 sb->s_qcop = &ext4_qctl_operations;
2659 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2660#endif
2661 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2662 mutex_init(&sbi->s_orphan_lock);
32ed5058 2663 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2664
2665 sb->s_root = NULL;
2666
2667 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2668 EXT4_HAS_INCOMPAT_FEATURE(sb,
2669 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2670
2671 /*
2672 * The first inode we look at is the journal inode. Don't try
2673 * root first: it may be modified in the journal!
2674 */
2675 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2676 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2677 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2678 goto failed_mount3;
624080ed
TT		 2679 if (!(sb->s_flags & MS_RDONLY) &&
2680 EXT4_SB(sb)->s_journal->j_failed_commit) {
2681 printk(KERN_CRIT "EXT4-fs error (device %s): "
2682 "ext4_fill_super: Journal transaction "
2b2d6d01 2683 "%u is corrupt\n", sb->s_id,
624080ed 2684 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2685 if (test_opt(sb, ERRORS_RO)) {
2686 printk(KERN_CRIT
2687 "Mounting filesystem read-only\n");
624080ed
TT		 2688 sb->s_flags |= MS_RDONLY;
2689 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2690 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2691 }
2692 if (test_opt(sb, ERRORS_PANIC)) {
2693 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2694 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 2695 ext4_commit_super(sb, 1);
624080ed
TT		 2696 goto failed_mount4;
2697 }
2698 }
0390131b
FM		 2699 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2700 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2701 printk(KERN_ERR "EXT4-fs: required journal recovery "
2702 "suppressed and not mounted read-only\n");
2703 goto failed_mount4;
ac27a0ec 2704 } else {
0390131b
FM		 2705 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2706 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2707 sbi->s_journal = NULL;
2708 needs_recovery = 0;
2709 goto no_journal;
ac27a0ec
DK		 2710 }
2711
eb40a09c
JS		 2712 if (ext4_blocks_count(es) > 0xffffffffULL &&
2713 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2714 JBD2_FEATURE_INCOMPAT_64BIT)) {
abda1418 2715 printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n");
eb40a09c
JS		 2716 goto failed_mount4;
2717 }
2718
818d276c
GS		 2719 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2720 jbd2_journal_set_features(sbi->s_journal,
2721 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2722 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2723 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2724 jbd2_journal_set_features(sbi->s_journal,
2725 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2726 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2727 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2728 } else {
2729 jbd2_journal_clear_features(sbi->s_journal,
2730 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2731 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2732 }
2733
ac27a0ec
DK		 2734 /* We have now updated the journal if required, so we can
2735 * validate the data journaling mode. */
2736 switch (test_opt(sb, DATA_FLAGS)) {
2737 case 0:
2738 /* No mode set, assume a default based on the journal
63f57933
AM		 2739 * capabilities: ORDERED_DATA if the journal can
2740 * cope, else JOURNAL_DATA
2741 */
dab291af
MC		 2742 if (jbd2_journal_check_available_features
2743 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2744 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2745 else
2746 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2747 break;
2748
617ba13b
MC		 2749 case EXT4_MOUNT_ORDERED_DATA:
2750 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2751 if (!jbd2_journal_check_available_features
2752 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2753 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2754 "requested data journaling mode\n");
2755 goto failed_mount4;
2756 }
2757 default:
2758 break;
2759 }
b3881f74 2760 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2761
0390131b 2762no_journal:
ac27a0ec
DK		 2763
2764 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2765 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2766 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2767 "its supported only with writeback mode\n");
2768 clear_opt(sbi->s_mount_opt, NOBH);
2769 }
2770 }
2771 /*
dab291af 2772 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2773 * so we can safely mount the rest of the filesystem now.
2774 */
2775
1d1fe1ee
DH		 2776 root = ext4_iget(sb, EXT4_ROOT_INO);
2777 if (IS_ERR(root)) {
617ba13b 2778 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2779 ret = PTR_ERR(root);
ac27a0ec
DK		 2780 goto failed_mount4;
2781 }
2782 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2783 iput(root);
617ba13b 2784 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2785 goto failed_mount4;
2786 }
1d1fe1ee
DH		 2787 sb->s_root = d_alloc_root(root);
2788 if (!sb->s_root) {
2789 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2790 iput(root);
2791 ret = -ENOMEM;
2792 goto failed_mount4;
2793 }
ac27a0ec 2794
2b2d6d01 2795 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2796
2797 /* determine the minimum size of new large inodes, if present */
2798 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2799 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2800 EXT4_GOOD_OLD_INODE_SIZE;
2801 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2802 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2803 if (sbi->s_want_extra_isize <
2804 le16_to_cpu(es->s_want_extra_isize))
2805 sbi->s_want_extra_isize =
2806 le16_to_cpu(es->s_want_extra_isize);
2807 if (sbi->s_want_extra_isize <
2808 le16_to_cpu(es->s_min_extra_isize))
2809 sbi->s_want_extra_isize =
2810 le16_to_cpu(es->s_min_extra_isize);
2811 }
2812 }
2813 /* Check if enough inode space is available */
2814 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2815 sbi->s_inode_size) {
2816 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2817 EXT4_GOOD_OLD_INODE_SIZE;
2818 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2819 "available.\n");
2820 }
2821
c2774d84
AK		 2822 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2823 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2824 "requested data journaling mode\n");
2825 clear_opt(sbi->s_mount_opt, DELALLOC);
2826 } else if (test_opt(sb, DELALLOC))
2827 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2828
2829 ext4_ext_init(sb);
2830 err = ext4_mb_init(sb, needs_recovery);
2831 if (err) {
2832 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2833 err);
2834 goto failed_mount4;
2835 }
2836
3197ebdb
TT		 2837 sbi->s_kobj.kset = ext4_kset;
2838 init_completion(&sbi->s_kobj_unregister);
2839 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2840 "%s", sb->s_id);
2841 if (err) {
2842 ext4_mb_release(sb);
2843 ext4_ext_release(sb);
2844 goto failed_mount4;
2845 };
2846
617ba13b
MC		 2847 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2848 ext4_orphan_cleanup(sb, es);
2849 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2850 if (needs_recovery) {
2b2d6d01 2851 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
0390131b
FM		 2852 ext4_mark_recovery_complete(sb, es);
2853 }
2854 if (EXT4_SB(sb)->s_journal) {
2855 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2856 descr = " journalled data mode";
2857 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2858 descr = " ordered data mode";
2859 else
2860 descr = " writeback data mode";
2861 } else
2862 descr = "out journal";
2863
2864 printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
2865 sb->s_id, descr);
ac27a0ec
DK		 2866
2867 lock_kernel();
2868 return 0;
2869
617ba13b 2870cantfind_ext4:
ac27a0ec 2871 if (!silent)
617ba13b 2872 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2873 sb->s_id);
2874 goto failed_mount;
2875
2876failed_mount4:
0390131b
FM		 2877 printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
2878 if (sbi->s_journal) {
2879 jbd2_journal_destroy(sbi->s_journal);
2880 sbi->s_journal = NULL;
2881 }
ac27a0ec 2882failed_mount3:
c5ca7c76
TT		 2883 if (sbi->s_flex_groups) {
2884 if (is_vmalloc_addr(sbi->s_flex_groups))
2885 vfree(sbi->s_flex_groups);
2886 else
2887 kfree(sbi->s_flex_groups);
2888 }
ac27a0ec
DK		 2889 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2890 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2891 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2892 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2893failed_mount2:
2894 for (i = 0; i < db_count; i++)
2895 brelse(sbi->s_group_desc[i]);
2896 kfree(sbi->s_group_desc);
2897failed_mount:
240799cd 2898 if (sbi->s_proc) {
9f6200bb 2899 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2900 }
ac27a0ec
DK		 2901#ifdef CONFIG_QUOTA
2902 for (i = 0; i < MAXQUOTAS; i++)
2903 kfree(sbi->s_qf_names[i]);
2904#endif
617ba13b 2905 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2906 brelse(bh);
2907out_fail:
2908 sb->s_fs_info = NULL;
2909 kfree(sbi);
2910 lock_kernel();
1d1fe1ee 2911 return ret;
ac27a0ec
DK		 2912}
2913
2914/*
2915 * Setup any per-fs journal parameters now. We'll do this both on
2916 * initial mount, once the journal has been initialised but before we've
2917 * done any recovery; and again on any subsequent remount.
2918 */
617ba13b 2919static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2920{
617ba13b 2921 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 2922
30773840
TT		 2923 journal->j_commit_interval = sbi->s_commit_interval;
2924 journal->j_min_batch_time = sbi->s_min_batch_time;
2925 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 2926
2927 spin_lock(&journal->j_state_lock);
2928 if (test_opt(sb, BARRIER))
dab291af 2929 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2930 else
dab291af 2931 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 2932 if (test_opt(sb, DATA_ERR_ABORT))
2933 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2934 else
2935 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 2936 spin_unlock(&journal->j_state_lock);
2937}
2938
617ba13b 2939static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2940 unsigned int journal_inum)
2941{
2942 struct inode *journal_inode;
2943 journal_t *journal;
2944
0390131b
FM		 2945 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2946
ac27a0ec
DK		 2947 /* First, test for the existence of a valid inode on disk. Bad
2948 * things happen if we iget() an unused inode, as the subsequent
2949 * iput() will try to delete it. */
2950
1d1fe1ee
DH		 2951 journal_inode = ext4_iget(sb, journal_inum);
2952 if (IS_ERR(journal_inode)) {
617ba13b 2953 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2954 return NULL;
2955 }
2956 if (!journal_inode->i_nlink) {
2957 make_bad_inode(journal_inode);
2958 iput(journal_inode);
617ba13b 2959 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2960 return NULL;
2961 }
2962
e5f8eab8 2963 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2964 journal_inode, journal_inode->i_size);
1d1fe1ee 2965 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2966 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2967 iput(journal_inode);
2968 return NULL;
2969 }
2970
dab291af 2971 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2972 if (!journal) {
617ba13b 2973 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2974 iput(journal_inode);
2975 return NULL;
2976 }
2977 journal->j_private = sb;
617ba13b 2978 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2979 return journal;
2980}
2981
617ba13b 2982static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2983 dev_t j_dev)
2984{
2b2d6d01 2985 struct buffer_head *bh;
ac27a0ec 2986 journal_t *journal;
617ba13b
MC		 2987 ext4_fsblk_t start;
2988 ext4_fsblk_t len;
ac27a0ec 2989 int hblock, blocksize;
617ba13b 2990 ext4_fsblk_t sb_block;
ac27a0ec 2991 unsigned long offset;
2b2d6d01 2992 struct ext4_super_block *es;
ac27a0ec
DK		 2993 struct block_device *bdev;
2994
0390131b
FM		 2995 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2996
617ba13b 2997 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2998 if (bdev == NULL)
2999 return NULL;
3000
3001 if (bd_claim(bdev, sb)) {
3002 printk(KERN_ERR
abda1418 3003 "EXT4-fs: failed to claim external journal device.\n");
9a1c3542 3004 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3005 return NULL;
3006 }
3007
3008 blocksize = sb->s_blocksize;
3009 hblock = bdev_hardsect_size(bdev);
3010 if (blocksize < hblock) {
3011 printk(KERN_ERR
617ba13b 3012 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 3013 goto out_bdev;
3014 }
3015
617ba13b
MC		 3016 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3017 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3018 set_blocksize(bdev, blocksize);
3019 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 3020 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 3021 "external journal\n");
3022 goto out_bdev;
3023 }
3024
617ba13b
MC		 3025 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3026 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3027 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 3028 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3029 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 3030 "bad superblock\n");
3031 brelse(bh);
3032 goto out_bdev;
3033 }
3034
617ba13b
MC		 3035 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3036 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 3037 brelse(bh);
3038 goto out_bdev;
3039 }
3040
bd81d8ee 3041 len = ext4_blocks_count(es);
ac27a0ec
DK		 3042 start = sb_block + 1;
3043 brelse(bh); /* we're done with the superblock */
3044
dab291af 3045 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3046 start, len, blocksize);
3047 if (!journal) {
617ba13b 3048 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 3049 goto out_bdev;
3050 }
3051 journal->j_private = sb;
3052 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3053 wait_on_buffer(journal->j_sb_buffer);
3054 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 3055 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 3056 goto out_journal;
3057 }
3058 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 3059 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 3060 "user (unsupported) - %d\n",
3061 be32_to_cpu(journal->j_superblock->s_nr_users));
3062 goto out_journal;
3063 }
617ba13b
MC		 3064 EXT4_SB(sb)->journal_bdev = bdev;
3065 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3066 return journal;
3067out_journal:
dab291af 3068 jbd2_journal_destroy(journal);
ac27a0ec 3069out_bdev:
617ba13b 3070 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3071 return NULL;
3072}
3073
617ba13b
MC		 3074static int ext4_load_journal(struct super_block *sb,
3075 struct ext4_super_block *es,
ac27a0ec
DK		 3076 unsigned long journal_devnum)
3077{
3078 journal_t *journal;
3079 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3080 dev_t journal_dev;
3081 int err = 0;
3082 int really_read_only;
3083
0390131b
FM		 3084 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3085
ac27a0ec
DK		 3086 if (journal_devnum &&
3087 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 3088 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 3089 "numbers have changed\n");
3090 journal_dev = new_decode_dev(journal_devnum);
3091 } else
3092 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3093
3094 really_read_only = bdev_read_only(sb->s_bdev);
3095
3096 /*
3097 * Are we loading a blank journal or performing recovery after a
3098 * crash? For recovery, we need to check in advance whether we
3099 * can get read-write access to the device.
3100 */
3101
617ba13b 3102 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3103 if (sb->s_flags & MS_RDONLY) {
617ba13b 3104 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 3105 "required on readonly filesystem.\n");
3106 if (really_read_only) {
617ba13b 3107 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 3108 "unavailable, cannot proceed.\n");
3109 return -EROFS;
3110 }
2b2d6d01
TT		 3111 printk(KERN_INFO "EXT4-fs: write access will "
3112 "be enabled during recovery.\n");
ac27a0ec
DK		 3113 }
3114 }
3115
3116 if (journal_inum && journal_dev) {
617ba13b 3117 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 3118 "and inode journals!\n");
3119 return -EINVAL;
3120 }
3121
3122 if (journal_inum) {
617ba13b 3123 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3124 return -EINVAL;
3125 } else {
617ba13b 3126 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3127 return -EINVAL;
3128 }
3129
4776004f
TT		 3130 if (journal->j_flags & JBD2_BARRIER)
3131 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
3132 else
3133 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
3134
ac27a0ec 3135 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3136 err = jbd2_journal_update_format(journal);
ac27a0ec 3137 if (err) {
617ba13b 3138 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 3139 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3140 return err;
3141 }
3142 }
3143
617ba13b 3144 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3145 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3146 if (!err)
dab291af 3147 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3148
3149 if (err) {
617ba13b 3150 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 3151 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3152 return err;
3153 }
3154
617ba13b
MC		 3155 EXT4_SB(sb)->s_journal = journal;
3156 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3157
3158 if (journal_devnum &&
3159 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3160 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3161
3162 /* Make sure we flush the recovery flag to disk. */
e2d67052 3163 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3164 }
3165
3166 return 0;
3167}
3168
e2d67052 3169static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3170{
e2d67052 3171 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3172 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3173 int error = 0;
ac27a0ec
DK		 3174
3175 if (!sbh)
c4be0c1d 3176 return error;
914258bf
TT		 3177 if (buffer_write_io_error(sbh)) {
3178 /*
3179 * Oh, dear. A previous attempt to write the
3180 * superblock failed. This could happen because the
3181 * USB device was yanked out. Or it could happen to
3182 * be a transient write error and maybe the block will
3183 * be remapped. Nothing we can do but to retry the
3184 * write and hope for the best.
3185 */
abda1418 3186 printk(KERN_ERR "EXT4-fs: previous I/O error to "
914258bf
TT		 3187 "superblock detected for %s.\n", sb->s_id);
3188 clear_buffer_write_io_error(sbh);
3189 set_buffer_uptodate(sbh);
3190 }
ac27a0ec 3191 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3192 es->s_kbytes_written =
3193 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3194 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3195 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3196 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3197 &EXT4_SB(sb)->s_freeblocks_counter));
3198 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3199 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3200 sb->s_dirt = 0;
ac27a0ec
DK		 3201 BUFFER_TRACE(sbh, "marking dirty");
3202 mark_buffer_dirty(sbh);
914258bf 3203 if (sync) {
c4be0c1d
TS		 3204 error = sync_dirty_buffer(sbh);
3205 if (error)
3206 return error;
3207
3208 error = buffer_write_io_error(sbh);
3209 if (error) {
abda1418 3210 printk(KERN_ERR "EXT4-fs: I/O error while writing "
914258bf
TT		 3211 "superblock for %s.\n", sb->s_id);
3212 clear_buffer_write_io_error(sbh);
3213 set_buffer_uptodate(sbh);
3214 }
3215 }
c4be0c1d 3216 return error;
ac27a0ec
DK		 3217}
3218
3219
3220/*
3221 * Have we just finished recovery? If so, and if we are mounting (or
3222 * remounting) the filesystem readonly, then we will end up with a
3223 * consistent fs on disk. Record that fact.
3224 */
2b2d6d01
TT		 3225static void ext4_mark_recovery_complete(struct super_block *sb,
3226 struct ext4_super_block *es)
ac27a0ec 3227{
617ba13b 3228 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3229
0390131b
FM		 3230 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3231 BUG_ON(journal != NULL);
3232 return;
3233 }
dab291af 3234 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3235 if (jbd2_journal_flush(journal) < 0)
3236 goto out;
3237
617ba13b 3238 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3239 sb->s_flags & MS_RDONLY) {
617ba13b 3240 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3241 ext4_commit_super(sb, 1);
ac27a0ec 3242 }
7ffe1ea8
HK		 3243
3244out:
dab291af 3245 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3246}
3247
3248/*
3249 * If we are mounting (or read-write remounting) a filesystem whose journal
3250 * has recorded an error from a previous lifetime, move that error to the
3251 * main filesystem now.
3252 */
2b2d6d01
TT		 3253static void ext4_clear_journal_err(struct super_block *sb,
3254 struct ext4_super_block *es)
ac27a0ec
DK		 3255{
3256 journal_t *journal;
3257 int j_errno;
3258 const char *errstr;
3259
0390131b
FM		 3260 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3261
617ba13b 3262 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3263
3264 /*
3265 * Now check for any error status which may have been recorded in the
617ba13b 3266 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3267 */
3268
dab291af 3269 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3270 if (j_errno) {
3271 char nbuf[16];
3272
617ba13b 3273 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3274 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3275 "from previous mount: %s", errstr);
46e665e9 3276 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3277 "filesystem check.");
3278
617ba13b
MC		 3279 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3280 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3281 ext4_commit_super(sb, 1);
ac27a0ec 3282
dab291af 3283 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3284 }
3285}
3286
3287/*
3288 * Force the running and committing transactions to commit,
3289 * and wait on the commit.
3290 */
617ba13b 3291int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3292{
3293 journal_t *journal;
0390131b 3294 int ret = 0;
ac27a0ec
DK		 3295
3296 if (sb->s_flags & MS_RDONLY)
3297 return 0;
3298
617ba13b 3299 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3300 if (journal)
0390131b 3301 ret = ext4_journal_force_commit(journal);
0390131b 3302
ac27a0ec
DK		 3303 return ret;
3304}
3305
2b2d6d01 3306static void ext4_write_super(struct super_block *sb)
ac27a0ec 3307{
9ca92389 3308 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3309}
3310
617ba13b 3311static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3312{
14ce0cb4 3313 int ret = 0;
9eddacf9 3314 tid_t target;
ac27a0ec 3315
ede86cc4 3316 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
9ca92389
TT		 3317 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
3318 if (wait)
3319 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
0390131b 3320 }
14ce0cb4 3321 return ret;
ac27a0ec
DK		 3322}
3323
3324/*
3325 * LVM calls this function before a (read-only) snapshot is created. This
3326 * gives us a chance to flush the journal completely and mark the fs clean.
3327 */
c4be0c1d 3328static int ext4_freeze(struct super_block *sb)
ac27a0ec 3329{
c4be0c1d
TS		 3330 int error = 0;
3331 journal_t *journal;
ac27a0ec 3332
9ca92389
TT		 3333 if (sb->s_flags & MS_RDONLY)
3334 return 0;
ac27a0ec 3335
9ca92389 3336 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3337
9ca92389
TT		 3338 /* Now we set up the journal barrier. */
3339 jbd2_journal_lock_updates(journal);
ac27a0ec 3340
9ca92389
TT		 3341 /*
3342 * Don't clear the needs_recovery flag if we failed to flush
3343 * the journal.
3344 */
3345 error = jbd2_journal_flush(journal);
3346 if (error < 0) {
3347 out:
3348 jbd2_journal_unlock_updates(journal);
3349 return error;
ac27a0ec 3350 }
9ca92389
TT		 3351
3352 /* Journal blocked and flushed, clear needs_recovery flag. */
3353 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3354 error = ext4_commit_super(sb, 1);
3355 if (error)
3356 goto out;
c4be0c1d 3357 return 0;
ac27a0ec
DK		 3358}
3359
3360/*
3361 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3362 * flag here, even though the filesystem is not technically dirty yet.
3363 */
c4be0c1d 3364static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3365{
9ca92389
TT		 3366 if (sb->s_flags & MS_RDONLY)
3367 return 0;
3368
3369 lock_super(sb);
3370 /* Reset the needs_recovery flag before the fs is unlocked. */
3371 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3372 ext4_commit_super(sb, 1);
3373 unlock_super(sb);
3374 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3375 return 0;
ac27a0ec
DK		 3376}
3377
2b2d6d01 3378static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3379{
2b2d6d01 3380 struct ext4_super_block *es;
617ba13b
MC		 3381 struct ext4_sb_info *sbi = EXT4_SB(sb);
3382 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3383 unsigned long old_sb_flags;
617ba13b 3384 struct ext4_mount_options old_opts;
8a266467 3385 ext4_group_t g;
b3881f74 3386 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3387 int err;
3388#ifdef CONFIG_QUOTA
3389 int i;
3390#endif
3391
3392 /* Store the original options */
3393 old_sb_flags = sb->s_flags;
3394 old_opts.s_mount_opt = sbi->s_mount_opt;
3395 old_opts.s_resuid = sbi->s_resuid;
3396 old_opts.s_resgid = sbi->s_resgid;
3397 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3398 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3399 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3400#ifdef CONFIG_QUOTA
3401 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3402 for (i = 0; i < MAXQUOTAS; i++)
3403 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3404#endif
b3881f74
TT		 3405 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3406 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3407
3408 /*
3409 * Allow the "check" option to be passed as a remount option.
3410 */
b3881f74
TT		 3411 if (!parse_options(data, sb, NULL, &journal_ioprio,
3412 &n_blocks_count, 1)) {
ac27a0ec
DK		 3413 err = -EINVAL;
3414 goto restore_opts;
3415 }
3416
617ba13b 3417 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3418 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3419
3420 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3421 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3422
3423 es = sbi->s_es;
3424
b3881f74 3425 if (sbi->s_journal) {
0390131b 3426 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3427 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3428 }
ac27a0ec
DK		 3429
3430 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3431 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3432 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3433 err = -EROFS;
3434 goto restore_opts;
3435 }
3436
3437 if (*flags & MS_RDONLY) {
3438 /*
3439 * First of all, the unconditional stuff we have to do
3440 * to disable replay of the journal when we next remount
3441 */
3442 sb->s_flags |= MS_RDONLY;
3443
3444 /*
3445 * OK, test if we are remounting a valid rw partition
3446 * readonly, and if so set the rdonly flag and then
3447 * mark the partition as valid again.
3448 */
617ba13b
MC		 3449 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3450 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3451 es->s_state = cpu_to_le16(sbi->s_mount_state);
3452
a63c9eb2 3453 if (sbi->s_journal)
0390131b 3454 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3455 } else {
3a06d778 3456 int ret;
617ba13b
MC		 3457 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3458 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3459 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec 3460 "remount RDWR because of unsupported "
3a06d778
AK		 3461 "optional features (%x).\n", sb->s_id,
3462 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3463 ~EXT4_FEATURE_RO_COMPAT_SUPP));
ac27a0ec
DK		 3464 err = -EROFS;
3465 goto restore_opts;
3466 }
ead6596b 3467
8a266467
TT		 3468 /*
3469 * Make sure the group descriptor checksums
3470 * are sane. If they aren't, refuse to
3471 * remount r/w.
3472 */
3473 for (g = 0; g < sbi->s_groups_count; g++) {
3474 struct ext4_group_desc *gdp =
3475 ext4_get_group_desc(sb, g, NULL);
3476
3477 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3478 printk(KERN_ERR
3479 "EXT4-fs: ext4_remount: "
a9df9a49 3480 "Checksum for group %u failed (%u!=%u)\n",
8a266467
TT		 3481 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3482 le16_to_cpu(gdp->bg_checksum));
3483 err = -EINVAL;
3484 goto restore_opts;
3485 }
3486 }
3487
ead6596b
ES		 3488 /*
3489 * If we have an unprocessed orphan list hanging
3490 * around from a previously readonly bdev mount,
3491 * require a full umount/remount for now.
3492 */
3493 if (es->s_last_orphan) {
3494 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3495 "remount RDWR because of unprocessed "
3496 "orphan inode list. Please "
3497 "umount/remount instead.\n",
3498 sb->s_id);
3499 err = -EINVAL;
3500 goto restore_opts;
3501 }
3502
ac27a0ec
DK		 3503 /*
3504 * Mounting a RDONLY partition read-write, so reread
3505 * and store the current valid flag. (It may have
3506 * been changed by e2fsck since we originally mounted
3507 * the partition.)
3508 */
0390131b
FM		 3509 if (sbi->s_journal)
3510 ext4_clear_journal_err(sb, es);
ac27a0ec 3511 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3512 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3513 goto restore_opts;
2b2d6d01 3514 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3515 sb->s_flags &= ~MS_RDONLY;
3516 }
3517 }
0390131b 3518 if (sbi->s_journal == NULL)
e2d67052 3519 ext4_commit_super(sb, 1);
0390131b 3520
ac27a0ec
DK		 3521#ifdef CONFIG_QUOTA
3522 /* Release old quota file names */
3523 for (i = 0; i < MAXQUOTAS; i++)
3524 if (old_opts.s_qf_names[i] &&
3525 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3526 kfree(old_opts.s_qf_names[i]);
3527#endif
3528 return 0;
3529restore_opts:
3530 sb->s_flags = old_sb_flags;
3531 sbi->s_mount_opt = old_opts.s_mount_opt;
3532 sbi->s_resuid = old_opts.s_resuid;
3533 sbi->s_resgid = old_opts.s_resgid;
3534 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3535 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3536 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3537#ifdef CONFIG_QUOTA
3538 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3539 for (i = 0; i < MAXQUOTAS; i++) {
3540 if (sbi->s_qf_names[i] &&
3541 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3542 kfree(sbi->s_qf_names[i]);
3543 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3544 }
3545#endif
3546 return err;
3547}
3548
2b2d6d01 3549static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3550{
3551 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3552 struct ext4_sb_info *sbi = EXT4_SB(sb);
3553 struct ext4_super_block *es = sbi->s_es;
960cc398 3554 u64 fsid;
ac27a0ec 3555
5e70030d
BP		 3556 if (test_opt(sb, MINIX_DF)) {
3557 sbi->s_overhead_last = 0;
6bc9feff 3558 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3559 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3560 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3561
3562 /*
5e70030d
BP		 3563 * Compute the overhead (FS structures). This is constant
3564 * for a given filesystem unless the number of block groups
3565 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3566 */
3567
3568 /*
3569 * All of the blocks before first_data_block are
3570 * overhead
3571 */
3572 overhead = le32_to_cpu(es->s_first_data_block);
3573
3574 /*
3575 * Add the overhead attributed to the superblock and
3576 * block group descriptors. If the sparse superblocks
3577 * feature is turned on, then not all groups have this.
3578 */
3579 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3580 overhead += ext4_bg_has_super(sb, i) +
3581 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3582 cond_resched();
3583 }
3584
3585 /*
3586 * Every block group has an inode bitmap, a block
3587 * bitmap, and an inode table.
3588 */
5e70030d
BP		 3589 overhead += ngroups * (2 + sbi->s_itb_per_group);
3590 sbi->s_overhead_last = overhead;
3591 smp_wmb();
6bc9feff 3592 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3593 }
3594
617ba13b 3595 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3596 buf->f_bsize = sb->s_blocksize;
5e70030d 3597 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3598 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3599 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3600 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3601 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3602 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3603 buf->f_bavail = 0;
3604 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3605 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3606 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3607 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3608 fsid = le64_to_cpup((void *)es->s_uuid) ^
3609 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3610 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3611 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3612 return 0;
3613}
3614
3615/* Helper function for writing quotas on sync - we need to start transaction before quota file
3616 * is locked for write. Otherwise the are possible deadlocks:
3617 * Process 1 Process 2
617ba13b 3618 * ext4_create() quota_sync()
a269eb18
JK		 3619 * jbd2_journal_start() write_dquot()
3620 * vfs_dq_init() down(dqio_mutex)
dab291af 3621 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3622 *
3623 */
3624
3625#ifdef CONFIG_QUOTA
3626
3627static inline struct inode *dquot_to_inode(struct dquot *dquot)
3628{
3629 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3630}
3631
617ba13b 3632static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3633{
3634 int ret, err;
3635 handle_t *handle;
3636 struct inode *inode;
3637
3638 inode = dquot_to_inode(dquot);
617ba13b
MC		 3639 handle = ext4_journal_start(inode,
3640 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3641 if (IS_ERR(handle))
3642 return PTR_ERR(handle);
3643 ret = dquot_commit(dquot);
617ba13b 3644 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3645 if (!ret)
3646 ret = err;
3647 return ret;
3648}
3649
617ba13b 3650static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3651{
3652 int ret, err;
3653 handle_t *handle;
3654
617ba13b
MC		 3655 handle = ext4_journal_start(dquot_to_inode(dquot),
3656 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3657 if (IS_ERR(handle))
3658 return PTR_ERR(handle);
3659 ret = dquot_acquire(dquot);
617ba13b 3660 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3661 if (!ret)
3662 ret = err;
3663 return ret;
3664}
3665
617ba13b 3666static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3667{
3668 int ret, err;
3669 handle_t *handle;
3670
617ba13b
MC		 3671 handle = ext4_journal_start(dquot_to_inode(dquot),
3672 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3673 if (IS_ERR(handle)) {
3674 /* Release dquot anyway to avoid endless cycle in dqput() */
3675 dquot_release(dquot);
ac27a0ec 3676 return PTR_ERR(handle);
9c3013e9 3677 }
ac27a0ec 3678 ret = dquot_release(dquot);
617ba13b 3679 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3680 if (!ret)
3681 ret = err;
3682 return ret;
3683}
3684
617ba13b 3685static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3686{
2c8be6b2 3687 /* Are we journaling quotas? */
617ba13b
MC		 3688 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3689 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3690 dquot_mark_dquot_dirty(dquot);
617ba13b 3691 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3692 } else {
3693 return dquot_mark_dquot_dirty(dquot);
3694 }
3695}
3696
617ba13b 3697static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3698{
3699 int ret, err;
3700 handle_t *handle;
3701
3702 /* Data block + inode block */
617ba13b 3703 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3704 if (IS_ERR(handle))
3705 return PTR_ERR(handle);
3706 ret = dquot_commit_info(sb, type);
617ba13b 3707 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3708 if (!ret)
3709 ret = err;
3710 return ret;
3711}
3712
3713/*
3714 * Turn on quotas during mount time - we need to find
3715 * the quota file and such...
3716 */
617ba13b 3717static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3718{
617ba13b
MC		 3719 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3720 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3721}
3722
3723/*
3724 * Standard function to be called on quota_on
3725 */
617ba13b 3726static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3727 char *name, int remount)
ac27a0ec
DK		 3728{
3729 int err;
8264613d 3730 struct path path;
ac27a0ec
DK		 3731
3732 if (!test_opt(sb, QUOTA))
3733 return -EINVAL;
8264613d 3734 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3735 if (remount)
8264613d 3736 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3737
8264613d 3738 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3739 if (err)
3740 return err;
0623543b 3741
ac27a0ec 3742 /* Quotafile not on the same filesystem? */
8264613d
AV		 3743 if (path.mnt->mnt_sb != sb) {
3744 path_put(&path);
ac27a0ec
DK		 3745 return -EXDEV;
3746 }
0623543b
JK		 3747 /* Journaling quota? */
3748 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3749 /* Quotafile not in fs root? */
8264613d 3750 if (path.dentry->d_parent != sb->s_root)
0623543b
JK		 3751 printk(KERN_WARNING
3752 "EXT4-fs: Quota file not on filesystem root. "
3753 "Journaled quota will not work.\n");
2b2d6d01 3754 }
0623543b
JK		 3755
3756 /*
3757 * When we journal data on quota file, we have to flush journal to see
3758 * all updates to the file when we bypass pagecache...
3759 */
0390131b
FM		 3760 if (EXT4_SB(sb)->s_journal &&
3761 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3762 /*
3763 * We don't need to lock updates but journal_flush() could
3764 * otherwise be livelocked...
3765 */
3766 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3767 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3768 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3769 if (err) {
8264613d 3770 path_put(&path);
7ffe1ea8
HK		 3771 return err;
3772 }
0623543b
JK		 3773 }
3774
8264613d
AV		 3775 err = vfs_quota_on_path(sb, type, format_id, &path);
3776 path_put(&path);
77e69dac 3777 return err;
ac27a0ec
DK		 3778}
3779
3780/* Read data from quotafile - avoid pagecache and such because we cannot afford
3781 * acquiring the locks... As quota files are never truncated and quota code
3782 * itself serializes the operations (and noone else should touch the files)
3783 * we don't have to be afraid of races */
617ba13b 3784static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3785 size_t len, loff_t off)
3786{
3787 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3788 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3789 int err = 0;
3790 int offset = off & (sb->s_blocksize - 1);
3791 int tocopy;
3792 size_t toread;
3793 struct buffer_head *bh;
3794 loff_t i_size = i_size_read(inode);
3795
3796 if (off > i_size)
3797 return 0;
3798 if (off+len > i_size)
3799 len = i_size-off;
3800 toread = len;
3801 while (toread > 0) {
3802 tocopy = sb->s_blocksize - offset < toread ?
3803 sb->s_blocksize - offset : toread;
617ba13b 3804 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3805 if (err)
3806 return err;
3807 if (!bh) /* A hole? */
3808 memset(data, 0, tocopy);
3809 else
3810 memcpy(data, bh->b_data+offset, tocopy);
3811 brelse(bh);
3812 offset = 0;
3813 toread -= tocopy;
3814 data += tocopy;
3815 blk++;
3816 }
3817 return len;
3818}
3819
3820/* Write to quotafile (we know the transaction is already started and has
3821 * enough credits) */
617ba13b 3822static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3823 const char *data, size_t len, loff_t off)
3824{
3825 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3826 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3827 int err = 0;
3828 int offset = off & (sb->s_blocksize - 1);
3829 int tocopy;
617ba13b 3830 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3831 size_t towrite = len;
3832 struct buffer_head *bh;
3833 handle_t *handle = journal_current_handle();
3834
0390131b 3835 if (EXT4_SB(sb)->s_journal && !handle) {
e5f8eab8 3836 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3837 " cancelled because transaction is not started.\n",
3838 (unsigned long long)off, (unsigned long long)len);
3839 return -EIO;
3840 }
ac27a0ec
DK		 3841 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3842 while (towrite > 0) {
3843 tocopy = sb->s_blocksize - offset < towrite ?
3844 sb->s_blocksize - offset : towrite;
617ba13b 3845 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3846 if (!bh)
3847 goto out;
3848 if (journal_quota) {
617ba13b 3849 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3850 if (err) {
3851 brelse(bh);
3852 goto out;
3853 }
3854 }
3855 lock_buffer(bh);
3856 memcpy(bh->b_data+offset, data, tocopy);
3857 flush_dcache_page(bh->b_page);
3858 unlock_buffer(bh);
3859 if (journal_quota)
0390131b 3860 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3861 else {
3862 /* Always do at least ordered writes for quotas */
678aaf48 3863 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3864 mark_buffer_dirty(bh);
3865 }
3866 brelse(bh);
3867 if (err)
3868 goto out;
3869 offset = 0;
3870 towrite -= tocopy;
3871 data += tocopy;
3872 blk++;
3873 }
3874out:
4d04e4fb
JK		 3875 if (len == towrite) {
3876 mutex_unlock(&inode->i_mutex);
ac27a0ec 3877 return err;
4d04e4fb 3878 }
ac27a0ec
DK		 3879 if (inode->i_size < off+len-towrite) {
3880 i_size_write(inode, off+len-towrite);
617ba13b 3881 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3882 }
ac27a0ec 3883 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3884 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3885 mutex_unlock(&inode->i_mutex);
3886 return len - towrite;
3887}
3888
3889#endif
3890
617ba13b 3891static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3892 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3893{
617ba13b 3894 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3895}
3896
03010a33
TT		 3897static struct file_system_type ext4_fs_type = {
3898 .owner = THIS_MODULE,
3899 .name = "ext4",
3900 .get_sb = ext4_get_sb,
3901 .kill_sb = kill_block_super,
3902 .fs_flags = FS_REQUIRES_DEV,
3903};
3904
3905#ifdef CONFIG_EXT4DEV_COMPAT
3906static int ext4dev_get_sb(struct file_system_type *fs_type,
3907 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3908{
3909 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3910 "to mount using ext4\n");
3911 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3912 "will go away by 2.6.31\n");
3913 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3914}
3915
617ba13b 3916static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3917 .owner = THIS_MODULE,
617ba13b 3918 .name = "ext4dev",
03010a33 3919 .get_sb = ext4dev_get_sb,
ac27a0ec
DK		 3920 .kill_sb = kill_block_super,
3921 .fs_flags = FS_REQUIRES_DEV,
3922};
03010a33
TT		 3923MODULE_ALIAS("ext4dev");
3924#endif
ac27a0ec 3925
617ba13b 3926static int __init init_ext4_fs(void)
ac27a0ec 3927{
c9de560d
AT		 3928 int err;
3929
3197ebdb
TT		 3930 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
3931 if (!ext4_kset)
3932 return -ENOMEM;
9f6200bb 3933 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 3934 err = init_ext4_mballoc();
ac27a0ec
DK		 3935 if (err)
3936 return err;
c9de560d
AT		 3937
3938 err = init_ext4_xattr();
3939 if (err)
3940 goto out2;
ac27a0ec
DK		 3941 err = init_inodecache();
3942 if (err)
3943 goto out1;
03010a33 3944 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 3945 if (err)
3946 goto out;
03010a33
TT		 3947#ifdef CONFIG_EXT4DEV_COMPAT
3948 err = register_filesystem(&ext4dev_fs_type);
3949 if (err) {
3950 unregister_filesystem(&ext4_fs_type);
3951 goto out;
3952 }
3953#endif
ac27a0ec
DK		 3954 return 0;
3955out:
3956 destroy_inodecache();
3957out1:
617ba13b 3958 exit_ext4_xattr();
c9de560d
AT		 3959out2:
3960 exit_ext4_mballoc();
ac27a0ec
DK		 3961 return err;
3962}
3963
617ba13b 3964static void __exit exit_ext4_fs(void)
ac27a0ec 3965{
03010a33
TT		 3966 unregister_filesystem(&ext4_fs_type);
3967#ifdef CONFIG_EXT4DEV_COMPAT
617ba13b 3968 unregister_filesystem(&ext4dev_fs_type);
03010a33 3969#endif
ac27a0ec 3970 destroy_inodecache();
617ba13b 3971 exit_ext4_xattr();
c9de560d 3972 exit_ext4_mballoc();
9f6200bb 3973 remove_proc_entry("fs/ext4", NULL);
3197ebdb 3974 kset_unregister(ext4_kset);
ac27a0ec
DK		 3975}
3976
3977MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 3978MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 3979MODULE_LICENSE("GPL");
617ba13b
MC		 3980module_init(init_ext4_fs)
3981module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)