projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ext3: provide function to release metadata pages under memory pressure
[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>
dab291af 23#include <linux/jbd2.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
27#include <linux/parser.h>
28#include <linux/smp_lock.h>
29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
ede86cc4 38#include <linux/marker.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
3dcf5451
CH		 43#include "ext4.h"
44#include "ext4_jbd2.h"
ac27a0ec
DK		 45#include "xattr.h"
46#include "acl.h"
47#include "namei.h"
717d50e4 48#include "group.h"
ac27a0ec 49
9f6200bb
TT		 50struct proc_dir_entry *ext4_proc_root;
51
617ba13b 52static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 53 unsigned long journal_devnum);
617ba13b 54static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 55 unsigned int);
2b2d6d01
TT		 56static void ext4_commit_super(struct super_block *sb,
57 struct ext4_super_block *es, int sync);
58static void ext4_mark_recovery_complete(struct super_block *sb,
59 struct ext4_super_block *es);
60static void ext4_clear_journal_err(struct super_block *sb,
61 struct ext4_super_block *es);
617ba13b 62static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 63static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 64 char nbuf[16]);
2b2d6d01
TT		 65static int ext4_remount(struct super_block *sb, int *flags, char *data);
66static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
617ba13b 67static void ext4_unlockfs(struct super_block *sb);
2b2d6d01 68static void ext4_write_super(struct super_block *sb);
617ba13b 69static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 70
bd81d8ee 71
8fadc143
AR		 72ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
73 struct ext4_group_desc *bg)
bd81d8ee 74{
3a14589c 75 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 76 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 77 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 78}
79
8fadc143
AR		 80ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
bd81d8ee 82{
5272f837 83 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 85 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 86}
87
8fadc143
AR		 88ext4_fsblk_t ext4_inode_table(struct super_block *sb,
89 struct ext4_group_desc *bg)
bd81d8ee 90{
5272f837 91 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 94}
95
560671a0
AK		 96__u32 ext4_free_blks_count(struct super_block *sb,
97 struct ext4_group_desc *bg)
98{
99 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
100 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
101 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
102}
103
104__u32 ext4_free_inodes_count(struct super_block *sb,
105 struct ext4_group_desc *bg)
106{
107 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
108 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
109 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
110}
111
112__u32 ext4_used_dirs_count(struct super_block *sb,
113 struct ext4_group_desc *bg)
114{
115 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
116 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
117 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
118}
119
120__u32 ext4_itable_unused_count(struct super_block *sb,
121 struct ext4_group_desc *bg)
122{
123 return le16_to_cpu(bg->bg_itable_unused_lo) |
124 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
125 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
126}
127
8fadc143
AR		 128void ext4_block_bitmap_set(struct super_block *sb,
129 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 130{
3a14589c 131 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 132 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
133 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 134}
135
8fadc143
AR		 136void ext4_inode_bitmap_set(struct super_block *sb,
137 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 138{
5272f837 139 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 140 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
141 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 142}
143
8fadc143
AR		 144void ext4_inode_table_set(struct super_block *sb,
145 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 146{
5272f837 147 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 148 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
149 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 150}
151
560671a0
AK		 152void ext4_free_blks_set(struct super_block *sb,
153 struct ext4_group_desc *bg, __u32 count)
154{
155 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
156 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
157 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
158}
159
160void ext4_free_inodes_set(struct super_block *sb,
161 struct ext4_group_desc *bg, __u32 count)
162{
163 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
164 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
165 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
166}
167
168void ext4_used_dirs_set(struct super_block *sb,
169 struct ext4_group_desc *bg, __u32 count)
170{
171 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
172 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
173 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
174}
175
176void ext4_itable_unused_set(struct super_block *sb,
177 struct ext4_group_desc *bg, __u32 count)
178{
179 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
180 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
181 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
182}
183
ac27a0ec 184/*
dab291af 185 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 186 *
187 * The only special thing we need to do here is to make sure that all
188 * journal_end calls result in the superblock being marked dirty, so
189 * that sync() will call the filesystem's write_super callback if
190 * appropriate.
191 */
617ba13b 192handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 193{
194 journal_t *journal;
195
196 if (sb->s_flags & MS_RDONLY)
197 return ERR_PTR(-EROFS);
198
199 /* Special case here: if the journal has aborted behind our
200 * backs (eg. EIO in the commit thread), then we still need to
201 * take the FS itself readonly cleanly. */
617ba13b 202 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 203 if (journal) {
204 if (is_journal_aborted(journal)) {
205 ext4_abort(sb, __func__,
206 "Detected aborted journal");
207 return ERR_PTR(-EROFS);
208 }
209 return jbd2_journal_start(journal, nblocks);
ac27a0ec 210 }
0390131b
FM		 211 /*
212 * We're not journaling, return the appropriate indication.
213 */
214 current->journal_info = EXT4_NOJOURNAL_HANDLE;
215 return current->journal_info;
ac27a0ec
DK		 216}
217
218/*
219 * The only special thing we need to do here is to make sure that all
dab291af 220 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 221 * that sync() will call the filesystem's write_super callback if
222 * appropriate.
223 */
617ba13b 224int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 225{
226 struct super_block *sb;
227 int err;
228 int rc;
229
0390131b
FM		 230 if (!ext4_handle_valid(handle)) {
231 /*
232 * Do this here since we don't call jbd2_journal_stop() in
233 * no-journal mode.
234 */
235 current->journal_info = NULL;
236 return 0;
237 }
ac27a0ec
DK		 238 sb = handle->h_transaction->t_journal->j_private;
239 err = handle->h_err;
dab291af 240 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 241
242 if (!err)
243 err = rc;
244 if (err)
617ba13b 245 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 246 return err;
247}
248
617ba13b 249void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 250 struct buffer_head *bh, handle_t *handle, int err)
251{
252 char nbuf[16];
617ba13b 253 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 254
0390131b
FM		 255 BUG_ON(!ext4_handle_valid(handle));
256
ac27a0ec
DK		 257 if (bh)
258 BUFFER_TRACE(bh, "abort");
259
260 if (!handle->h_err)
261 handle->h_err = err;
262
263 if (is_handle_aborted(handle))
264 return;
265
266 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
267 caller, errstr, err_fn);
268
dab291af 269 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 270}
271
272/* Deal with the reporting of failure conditions on a filesystem such as
273 * inconsistencies detected or read IO failures.
274 *
275 * On ext2, we can store the error state of the filesystem in the
617ba13b 276 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 277 * write ordering constraints on the superblock which prevent us from
278 * writing it out straight away; and given that the journal is about to
279 * be aborted, we can't rely on the current, or future, transactions to
280 * write out the superblock safely.
281 *
dab291af 282 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 283 * the journal instead. On recovery, the journal will compain about
284 * that error until we've noted it down and cleared it.
285 */
286
617ba13b 287static void ext4_handle_error(struct super_block *sb)
ac27a0ec 288{
617ba13b 289 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 290
617ba13b
MC		 291 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
292 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 293
294 if (sb->s_flags & MS_RDONLY)
295 return;
296
2b2d6d01 297 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 298 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 299
617ba13b 300 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 301 if (journal)
dab291af 302 jbd2_journal_abort(journal, -EIO);
ac27a0ec 303 }
2b2d6d01
TT		 304 if (test_opt(sb, ERRORS_RO)) {
305 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 306 sb->s_flags |= MS_RDONLY;
307 }
617ba13b 308 ext4_commit_super(sb, es, 1);
ac27a0ec 309 if (test_opt(sb, ERRORS_PANIC))
617ba13b 310 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 311 sb->s_id);
312}
313
2b2d6d01
TT		 314void ext4_error(struct super_block *sb, const char *function,
315 const char *fmt, ...)
ac27a0ec
DK		 316{
317 va_list args;
318
319 va_start(args, fmt);
2b2d6d01 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
617ba13b 325 ext4_handle_error(sb);
ac27a0ec
DK		 326}
327
2b2d6d01 328static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 329 char nbuf[16])
330{
331 char *errstr = NULL;
332
333 switch (errno) {
334 case -EIO:
335 errstr = "IO failure";
336 break;
337 case -ENOMEM:
338 errstr = "Out of memory";
339 break;
340 case -EROFS:
dab291af 341 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 342 errstr = "Journal has aborted";
343 else
344 errstr = "Readonly filesystem";
345 break;
346 default:
347 /* If the caller passed in an extra buffer for unknown
348 * errors, textualise them now. Else we just return
349 * NULL. */
350 if (nbuf) {
351 /* Check for truncated error codes... */
352 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
353 errstr = nbuf;
354 }
355 break;
356 }
357
358 return errstr;
359}
360
617ba13b 361/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 362 * automatically and invokes the appropriate error response. */
363
2b2d6d01 364void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 365{
366 char nbuf[16];
367 const char *errstr;
368
369 /* Special case: if the error is EROFS, and we're not already
370 * inside a transaction, then there's really no point in logging
371 * an error. */
372 if (errno == -EROFS && journal_current_handle() == NULL &&
373 (sb->s_flags & MS_RDONLY))
374 return;
375
617ba13b 376 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 377 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
378 sb->s_id, function, errstr);
ac27a0ec 379
617ba13b 380 ext4_handle_error(sb);
ac27a0ec
DK		 381}
382
383/*
617ba13b 384 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 385 * abort function may be used to deal with unrecoverable failures such
386 * as journal IO errors or ENOMEM at a critical moment in log management.
387 *
388 * We unconditionally force the filesystem into an ABORT|READONLY state,
389 * unless the error response on the fs has been set to panic in which
390 * case we take the easy way out and panic immediately.
391 */
392
2b2d6d01
TT		 393void ext4_abort(struct super_block *sb, const char *function,
394 const char *fmt, ...)
ac27a0ec
DK		 395{
396 va_list args;
397
2b2d6d01 398 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 399
400 va_start(args, fmt);
2b2d6d01 401 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 402 vprintk(fmt, args);
403 printk("\n");
404 va_end(args);
405
406 if (test_opt(sb, ERRORS_PANIC))
617ba13b 407 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 408
409 if (sb->s_flags & MS_RDONLY)
410 return;
411
412 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 413 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 414 sb->s_flags |= MS_RDONLY;
617ba13b 415 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ef2cabf7
HK		 416 if (EXT4_SB(sb)->s_journal)
417 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 418}
419
2b2d6d01
TT		 420void ext4_warning(struct super_block *sb, const char *function,
421 const char *fmt, ...)
ac27a0ec
DK		 422{
423 va_list args;
424
425 va_start(args, fmt);
617ba13b 426 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 427 sb->s_id, function);
428 vprintk(fmt, args);
429 printk("\n");
430 va_end(args);
431}
432
5d1b1b3f
AK		 433void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
434 const char *function, const char *fmt, ...)
435__releases(bitlock)
436__acquires(bitlock)
437{
438 va_list args;
439 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
440
441 va_start(args, fmt);
442 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
443 vprintk(fmt, args);
444 printk("\n");
445 va_end(args);
446
447 if (test_opt(sb, ERRORS_CONT)) {
448 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
449 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
450 ext4_commit_super(sb, es, 0);
451 return;
452 }
453 ext4_unlock_group(sb, grp);
454 ext4_handle_error(sb);
455 /*
456 * We only get here in the ERRORS_RO case; relocking the group
457 * may be dangerous, but nothing bad will happen since the
458 * filesystem will have already been marked read/only and the
459 * journal has been aborted. We return 1 as a hint to callers
460 * who might what to use the return value from
461 * ext4_grp_locked_error() to distinguish beween the
462 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
463 * aggressively from the ext4 function in question, with a
464 * more appropriate error code.
465 */
466 ext4_lock_group(sb, grp);
467 return;
468}
469
470
617ba13b 471void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 472{
617ba13b 473 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 474
617ba13b 475 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 476 return;
477
46e665e9 478 ext4_warning(sb, __func__,
ac27a0ec
DK		 479 "updating to rev %d because of new feature flag, "
480 "running e2fsck is recommended",
617ba13b 481 EXT4_DYNAMIC_REV);
ac27a0ec 482
617ba13b
MC		 483 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
484 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
485 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 486 /* leave es->s_feature_*compat flags alone */
487 /* es->s_uuid will be set by e2fsck if empty */
488
489 /*
490 * The rest of the superblock fields should be zero, and if not it
491 * means they are likely already in use, so leave them alone. We
492 * can leave it up to e2fsck to clean up any inconsistencies there.
493 */
494}
495
496/*
497 * Open the external journal device
498 */
617ba13b 499static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 500{
501 struct block_device *bdev;
502 char b[BDEVNAME_SIZE];
503
504 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
505 if (IS_ERR(bdev))
506 goto fail;
507 return bdev;
508
509fail:
617ba13b 510 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 511 __bdevname(dev, b), PTR_ERR(bdev));
512 return NULL;
513}
514
515/*
516 * Release the journal device
517 */
617ba13b 518static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 519{
520 bd_release(bdev);
9a1c3542 521 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 522}
523
617ba13b 524static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 525{
526 struct block_device *bdev;
527 int ret = -ENODEV;
528
529 bdev = sbi->journal_bdev;
530 if (bdev) {
617ba13b 531 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 532 sbi->journal_bdev = NULL;
533 }
534 return ret;
535}
536
537static inline struct inode *orphan_list_entry(struct list_head *l)
538{
617ba13b 539 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 540}
541
617ba13b 542static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 543{
544 struct list_head *l;
545
546 printk(KERN_ERR "sb orphan head is %d\n",
547 le32_to_cpu(sbi->s_es->s_last_orphan));
548
549 printk(KERN_ERR "sb_info orphan list:\n");
550 list_for_each(l, &sbi->s_orphan) {
551 struct inode *inode = orphan_list_entry(l);
552 printk(KERN_ERR " "
553 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
554 inode->i_sb->s_id, inode->i_ino, inode,
555 inode->i_mode, inode->i_nlink,
556 NEXT_ORPHAN(inode));
557 }
558}
559
2b2d6d01 560static void ext4_put_super(struct super_block *sb)
ac27a0ec 561{
617ba13b
MC		 562 struct ext4_sb_info *sbi = EXT4_SB(sb);
563 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 564 int i, err;
ac27a0ec 565
c9de560d 566 ext4_mb_release(sb);
a86c6181 567 ext4_ext_release(sb);
617ba13b 568 ext4_xattr_put_super(sb);
0390131b
FM		 569 if (sbi->s_journal) {
570 err = jbd2_journal_destroy(sbi->s_journal);
571 sbi->s_journal = NULL;
572 if (err < 0)
573 ext4_abort(sb, __func__,
574 "Couldn't clean up the journal");
575 }
ac27a0ec 576 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 577 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 578 es->s_state = cpu_to_le16(sbi->s_mount_state);
617ba13b 579 ext4_commit_super(sb, es, 1);
ac27a0ec 580 }
240799cd
TT		 581 if (sbi->s_proc) {
582 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
9f6200bb 583 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 584 }
ac27a0ec
DK		 585
586 for (i = 0; i < sbi->s_gdb_count; i++)
587 brelse(sbi->s_group_desc[i]);
588 kfree(sbi->s_group_desc);
772cb7c8 589 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 590 percpu_counter_destroy(&sbi->s_freeblocks_counter);
591 percpu_counter_destroy(&sbi->s_freeinodes_counter);
592 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 593 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 594 brelse(sbi->s_sbh);
595#ifdef CONFIG_QUOTA
596 for (i = 0; i < MAXQUOTAS; i++)
597 kfree(sbi->s_qf_names[i]);
598#endif
599
600 /* Debugging code just in case the in-memory inode orphan list
601 * isn't empty. The on-disk one can be non-empty if we've
602 * detected an error and taken the fs readonly, but the
603 * in-memory list had better be clean by this point. */
604 if (!list_empty(&sbi->s_orphan))
605 dump_orphan_list(sb, sbi);
606 J_ASSERT(list_empty(&sbi->s_orphan));
607
f98393a6 608 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 609 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
610 /*
611 * Invalidate the journal device's buffers. We don't want them
612 * floating about in memory - the physical journal device may
613 * hotswapped, and it breaks the `ro-after' testing code.
614 */
615 sync_blockdev(sbi->journal_bdev);
f98393a6 616 invalidate_bdev(sbi->journal_bdev);
617ba13b 617 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 618 }
619 sb->s_fs_info = NULL;
620 kfree(sbi);
621 return;
622}
623
e18b890b 624static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 625
626/*
627 * Called inside transaction, so use GFP_NOFS
628 */
617ba13b 629static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 630{
617ba13b 631 struct ext4_inode_info *ei;
ac27a0ec 632
e6b4f8da 633 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 634 if (!ei)
635 return NULL;
03010a33 636#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 637 ei->i_acl = EXT4_ACL_NOT_CACHED;
638 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec 639#endif
ac27a0ec 640 ei->vfs_inode.i_version = 1;
91246c00 641 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 642 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 643 INIT_LIST_HEAD(&ei->i_prealloc_list);
644 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 645 /*
646 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
647 * therefore it can be null here. Don't check it, just initialize
648 * jinode.
649 */
678aaf48 650 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 651 ei->i_reserved_data_blocks = 0;
652 ei->i_reserved_meta_blocks = 0;
653 ei->i_allocated_meta_blocks = 0;
654 ei->i_delalloc_reserved_flag = 0;
655 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 656 return &ei->vfs_inode;
657}
658
617ba13b 659static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 660{
9f7dd93d
VA		 661 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
662 printk("EXT4 Inode %p: orphan list check failed!\n",
663 EXT4_I(inode));
664 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
665 EXT4_I(inode), sizeof(struct ext4_inode_info),
666 true);
667 dump_stack();
668 }
617ba13b 669 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 670}
671
51cc5068 672static void init_once(void *foo)
ac27a0ec 673{
617ba13b 674 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 675
a35afb83 676 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 677#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 678 init_rwsem(&ei->xattr_sem);
ac27a0ec 679#endif
0e855ac8 680 init_rwsem(&ei->i_data_sem);
a35afb83 681 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 682}
683
684static int init_inodecache(void)
685{
617ba13b
MC		 686 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
687 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 688 0, (SLAB_RECLAIM_ACCOUNT|
689 SLAB_MEM_SPREAD),
20c2df83 690 init_once);
617ba13b 691 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 692 return -ENOMEM;
693 return 0;
694}
695
696static void destroy_inodecache(void)
697{
617ba13b 698 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 699}
700
617ba13b 701static void ext4_clear_inode(struct inode *inode)
ac27a0ec 702{
03010a33 703#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 704 if (EXT4_I(inode)->i_acl &&
705 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
706 posix_acl_release(EXT4_I(inode)->i_acl);
707 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
708 }
709 if (EXT4_I(inode)->i_default_acl &&
710 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
711 posix_acl_release(EXT4_I(inode)->i_default_acl);
712 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 713 }
714#endif
c2ea3fde 715 ext4_discard_preallocations(inode);
0390131b
FM		 716 if (EXT4_JOURNAL(inode))
717 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 718 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 719}
720
2b2d6d01
TT		 721static inline void ext4_show_quota_options(struct seq_file *seq,
722 struct super_block *sb)
ac27a0ec
DK		 723{
724#if defined(CONFIG_QUOTA)
617ba13b 725 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 726
727 if (sbi->s_jquota_fmt)
728 seq_printf(seq, ",jqfmt=%s",
af5bc92d 729 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 730
731 if (sbi->s_qf_names[USRQUOTA])
732 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
733
734 if (sbi->s_qf_names[GRPQUOTA])
735 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
736
617ba13b 737 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 738 seq_puts(seq, ",usrquota");
739
617ba13b 740 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 741 seq_puts(seq, ",grpquota");
742#endif
743}
744
d9c9bef1
MS		 745/*
746 * Show an option if
747 * - it's set to a non-default value OR
748 * - if the per-sb default is different from the global default
749 */
617ba13b 750static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 751{
aa22df2c
AK		 752 int def_errors;
753 unsigned long def_mount_opts;
ac27a0ec 754 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 755 struct ext4_sb_info *sbi = EXT4_SB(sb);
756 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 757
758 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 759 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 760
761 if (sbi->s_sb_block != 1)
762 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
763 if (test_opt(sb, MINIX_DF))
764 seq_puts(seq, ",minixdf");
aa22df2c 765 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 766 seq_puts(seq, ",grpid");
767 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
768 seq_puts(seq, ",nogrpid");
769 if (sbi->s_resuid != EXT4_DEF_RESUID ||
770 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
771 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
772 }
773 if (sbi->s_resgid != EXT4_DEF_RESGID ||
774 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
775 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
776 }
bb4f397a 777 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 778 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 779 def_errors == EXT4_ERRORS_CONTINUE) {
780 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 781 }
782 }
aa22df2c 783 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 784 seq_puts(seq, ",errors=continue");
aa22df2c 785 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 786 seq_puts(seq, ",errors=panic");
aa22df2c 787 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 788 seq_puts(seq, ",nouid32");
aa22df2c 789 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 790 seq_puts(seq, ",debug");
791 if (test_opt(sb, OLDALLOC))
792 seq_puts(seq, ",oldalloc");
03010a33 793#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 794 if (test_opt(sb, XATTR_USER) &&
795 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 796 seq_puts(seq, ",user_xattr");
797 if (!test_opt(sb, XATTR_USER) &&
798 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
799 seq_puts(seq, ",nouser_xattr");
800 }
801#endif
03010a33 802#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 803 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 804 seq_puts(seq, ",acl");
805 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
806 seq_puts(seq, ",noacl");
807#endif
808 if (!test_opt(sb, RESERVATION))
809 seq_puts(seq, ",noreservation");
30773840 810 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 811 seq_printf(seq, ",commit=%u",
812 (unsigned) (sbi->s_commit_interval / HZ));
813 }
30773840
TT		 814 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
815 seq_printf(seq, ",min_batch_time=%u",
816 (unsigned) sbi->s_min_batch_time);
817 }
818 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
819 seq_printf(seq, ",max_batch_time=%u",
820 (unsigned) sbi->s_min_batch_time);
821 }
822
571640ca
ES		 823 /*
824 * We're changing the default of barrier mount option, so
825 * let's always display its mount state so it's clear what its
826 * status is.
827 */
828 seq_puts(seq, ",barrier=");
829 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 830 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
831 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 832 if (test_opt(sb, NOBH))
833 seq_puts(seq, ",nobh");
834 if (!test_opt(sb, EXTENTS))
835 seq_puts(seq, ",noextents");
25ec56b5
JNC		 836 if (test_opt(sb, I_VERSION))
837 seq_puts(seq, ",i_version");
dd919b98
AK		 838 if (!test_opt(sb, DELALLOC))
839 seq_puts(seq, ",nodelalloc");
840
ac27a0ec 841
cb45bbe4
MS		 842 if (sbi->s_stripe)
843 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 844 /*
845 * journal mode get enabled in different ways
846 * So just print the value even if we didn't specify it
847 */
617ba13b 848 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 849 seq_puts(seq, ",data=journal");
617ba13b 850 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 851 seq_puts(seq, ",data=ordered");
617ba13b 852 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 853 seq_puts(seq, ",data=writeback");
854
240799cd
TT		 855 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
856 seq_printf(seq, ",inode_readahead_blks=%u",
857 sbi->s_inode_readahead_blks);
858
5bf5683a
HK		 859 if (test_opt(sb, DATA_ERR_ABORT))
860 seq_puts(seq, ",data_err=abort");
861
617ba13b 862 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 863 return 0;
864}
865
866
1b961ac0
CH		 867static struct inode *ext4_nfs_get_inode(struct super_block *sb,
868 u64 ino, u32 generation)
ac27a0ec 869{
ac27a0ec 870 struct inode *inode;
ac27a0ec 871
617ba13b 872 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 873 return ERR_PTR(-ESTALE);
617ba13b 874 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 875 return ERR_PTR(-ESTALE);
876
877 /* iget isn't really right if the inode is currently unallocated!!
878 *
617ba13b 879 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 880 * deleted, so we should be safe.
881 *
882 * Currently we don't know the generation for parent directory, so
883 * a generation of 0 means "accept any"
884 */
1d1fe1ee
DH		 885 inode = ext4_iget(sb, ino);
886 if (IS_ERR(inode))
887 return ERR_CAST(inode);
888 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 889 iput(inode);
890 return ERR_PTR(-ESTALE);
891 }
1b961ac0
CH		 892
893 return inode;
894}
895
896static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
897 int fh_len, int fh_type)
898{
899 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
900 ext4_nfs_get_inode);
901}
902
903static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
904 int fh_len, int fh_type)
905{
906 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
907 ext4_nfs_get_inode);
ac27a0ec
DK		 908}
909
910#ifdef CONFIG_QUOTA
af5bc92d 911#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 912#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 913
617ba13b
MC		 914static int ext4_dquot_initialize(struct inode *inode, int type);
915static int ext4_dquot_drop(struct inode *inode);
916static int ext4_write_dquot(struct dquot *dquot);
917static int ext4_acquire_dquot(struct dquot *dquot);
918static int ext4_release_dquot(struct dquot *dquot);
919static int ext4_mark_dquot_dirty(struct dquot *dquot);
920static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 921static int ext4_quota_on(struct super_block *sb, int type, int format_id,
922 char *path, int remount);
617ba13b
MC		 923static int ext4_quota_on_mount(struct super_block *sb, int type);
924static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 925 size_t len, loff_t off);
617ba13b 926static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 927 const char *data, size_t len, loff_t off);
928
617ba13b
MC		 929static struct dquot_operations ext4_quota_operations = {
930 .initialize = ext4_dquot_initialize,
931 .drop = ext4_dquot_drop,
ac27a0ec
DK		 932 .alloc_space = dquot_alloc_space,
933 .alloc_inode = dquot_alloc_inode,
934 .free_space = dquot_free_space,
935 .free_inode = dquot_free_inode,
936 .transfer = dquot_transfer,
617ba13b
MC		 937 .write_dquot = ext4_write_dquot,
938 .acquire_dquot = ext4_acquire_dquot,
939 .release_dquot = ext4_release_dquot,
940 .mark_dirty = ext4_mark_dquot_dirty,
941 .write_info = ext4_write_info
ac27a0ec
DK		 942};
943
617ba13b
MC		 944static struct quotactl_ops ext4_qctl_operations = {
945 .quota_on = ext4_quota_on,
ac27a0ec
DK		 946 .quota_off = vfs_quota_off,
947 .quota_sync = vfs_quota_sync,
948 .get_info = vfs_get_dqinfo,
949 .set_info = vfs_set_dqinfo,
950 .get_dqblk = vfs_get_dqblk,
951 .set_dqblk = vfs_set_dqblk
952};
953#endif
954
ee9b6d61 955static const struct super_operations ext4_sops = {
617ba13b
MC		 956 .alloc_inode = ext4_alloc_inode,
957 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 958 .write_inode = ext4_write_inode,
959 .dirty_inode = ext4_dirty_inode,
960 .delete_inode = ext4_delete_inode,
961 .put_super = ext4_put_super,
962 .write_super = ext4_write_super,
963 .sync_fs = ext4_sync_fs,
964 .write_super_lockfs = ext4_write_super_lockfs,
965 .unlockfs = ext4_unlockfs,
966 .statfs = ext4_statfs,
967 .remount_fs = ext4_remount,
968 .clear_inode = ext4_clear_inode,
969 .show_options = ext4_show_options,
ac27a0ec 970#ifdef CONFIG_QUOTA
617ba13b
MC		 971 .quota_read = ext4_quota_read,
972 .quota_write = ext4_quota_write,
ac27a0ec
DK		 973#endif
974};
975
39655164 976static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 977 .fh_to_dentry = ext4_fh_to_dentry,
978 .fh_to_parent = ext4_fh_to_parent,
617ba13b 979 .get_parent = ext4_get_parent,
ac27a0ec
DK		 980};
981
982enum {
983 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
984 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 985 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec
DK		 986 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
987 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
30773840
TT		 988 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
989 Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 990 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 991 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
5bf5683a 992 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec
DK		 993 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
994 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
995 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 996 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
01436ef2 997 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
240799cd 998 Opt_inode_readahead_blks
ac27a0ec
DK		 999};
1000
a447c093 1001static const match_table_t tokens = {
ac27a0ec
DK		 1002 {Opt_bsd_df, "bsddf"},
1003 {Opt_minix_df, "minixdf"},
1004 {Opt_grpid, "grpid"},
1005 {Opt_grpid, "bsdgroups"},
1006 {Opt_nogrpid, "nogrpid"},
1007 {Opt_nogrpid, "sysvgroups"},
1008 {Opt_resgid, "resgid=%u"},
1009 {Opt_resuid, "resuid=%u"},
1010 {Opt_sb, "sb=%u"},
1011 {Opt_err_cont, "errors=continue"},
1012 {Opt_err_panic, "errors=panic"},
1013 {Opt_err_ro, "errors=remount-ro"},
1014 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1015 {Opt_debug, "debug"},
1016 {Opt_oldalloc, "oldalloc"},
1017 {Opt_orlov, "orlov"},
1018 {Opt_user_xattr, "user_xattr"},
1019 {Opt_nouser_xattr, "nouser_xattr"},
1020 {Opt_acl, "acl"},
1021 {Opt_noacl, "noacl"},
1022 {Opt_reservation, "reservation"},
1023 {Opt_noreservation, "noreservation"},
1024 {Opt_noload, "noload"},
1025 {Opt_nobh, "nobh"},
1026 {Opt_bh, "bh"},
1027 {Opt_commit, "commit=%u"},
30773840
TT		 1028 {Opt_min_batch_time, "min_batch_time=%u"},
1029 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec
DK		 1030 {Opt_journal_update, "journal=update"},
1031 {Opt_journal_inum, "journal=%u"},
1032 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1033 {Opt_journal_checksum, "journal_checksum"},
1034 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1035 {Opt_abort, "abort"},
1036 {Opt_data_journal, "data=journal"},
1037 {Opt_data_ordered, "data=ordered"},
1038 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1039 {Opt_data_err_abort, "data_err=abort"},
1040 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1041 {Opt_offusrjquota, "usrjquota="},
1042 {Opt_usrjquota, "usrjquota=%s"},
1043 {Opt_offgrpjquota, "grpjquota="},
1044 {Opt_grpjquota, "grpjquota=%s"},
1045 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1046 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1047 {Opt_grpquota, "grpquota"},
1048 {Opt_noquota, "noquota"},
1049 {Opt_quota, "quota"},
1050 {Opt_usrquota, "usrquota"},
1051 {Opt_barrier, "barrier=%u"},
a86c6181 1052 {Opt_extents, "extents"},
1e2462f9 1053 {Opt_noextents, "noextents"},
25ec56b5 1054 {Opt_i_version, "i_version"},
c9de560d 1055 {Opt_stripe, "stripe=%u"},
ac27a0ec 1056 {Opt_resize, "resize"},
64769240 1057 {Opt_delalloc, "delalloc"},
dd919b98 1058 {Opt_nodelalloc, "nodelalloc"},
240799cd 1059 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
f3f12faa 1060 {Opt_err, NULL},
ac27a0ec
DK		 1061};
1062
617ba13b 1063static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1064{
617ba13b 1065 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1066 char *options = (char *) *data;
1067
1068 if (!options || strncmp(options, "sb=", 3) != 0)
1069 return 1; /* Default location */
1070 options += 3;
617ba13b 1071 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1072 sb_block = simple_strtoul(options, &options, 0);
1073 if (*options && *options != ',') {
4776004f 1074 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1075 (char *) *data);
1076 return 1;
1077 }
1078 if (*options == ',')
1079 options++;
1080 *data = (void *) options;
1081 return sb_block;
1082}
1083
2b2d6d01
TT		 1084static int parse_options(char *options, struct super_block *sb,
1085 unsigned int *inum, unsigned long *journal_devnum,
1086 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1087{
617ba13b 1088 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1089 char *p;
ac27a0ec
DK		 1090 substring_t args[MAX_OPT_ARGS];
1091 int data_opt = 0;
1092 int option;
1093#ifdef CONFIG_QUOTA
dfc5d03f 1094 int qtype, qfmt;
ac27a0ec
DK		 1095 char *qname;
1096#endif
c07651b5 1097 ext4_fsblk_t last_block;
ac27a0ec
DK		 1098
1099 if (!options)
1100 return 1;
1101
2b2d6d01 1102 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1103 int token;
1104 if (!*p)
1105 continue;
1106
1107 token = match_token(p, tokens, args);
1108 switch (token) {
1109 case Opt_bsd_df:
2b2d6d01 1110 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1111 break;
1112 case Opt_minix_df:
2b2d6d01 1113 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1114 break;
1115 case Opt_grpid:
2b2d6d01 1116 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1117 break;
1118 case Opt_nogrpid:
2b2d6d01 1119 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1120 break;
1121 case Opt_resuid:
1122 if (match_int(&args[0], &option))
1123 return 0;
1124 sbi->s_resuid = option;
1125 break;
1126 case Opt_resgid:
1127 if (match_int(&args[0], &option))
1128 return 0;
1129 sbi->s_resgid = option;
1130 break;
1131 case Opt_sb:
1132 /* handled by get_sb_block() instead of here */
1133 /* *sb_block = match_int(&args[0]); */
1134 break;
1135 case Opt_err_panic:
2b2d6d01
TT		 1136 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1137 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1138 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1139 break;
1140 case Opt_err_ro:
2b2d6d01
TT		 1141 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1142 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1143 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1144 break;
1145 case Opt_err_cont:
2b2d6d01
TT		 1146 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1147 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1148 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1149 break;
1150 case Opt_nouid32:
2b2d6d01 1151 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1152 break;
ac27a0ec 1153 case Opt_debug:
2b2d6d01 1154 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1155 break;
1156 case Opt_oldalloc:
2b2d6d01 1157 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1158 break;
1159 case Opt_orlov:
2b2d6d01 1160 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1161 break;
03010a33 1162#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1163 case Opt_user_xattr:
2b2d6d01 1164 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1165 break;
1166 case Opt_nouser_xattr:
2b2d6d01 1167 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1168 break;
1169#else
1170 case Opt_user_xattr:
1171 case Opt_nouser_xattr:
4776004f
TT		 1172 printk(KERN_ERR "EXT4 (no)user_xattr options "
1173 "not supported\n");
ac27a0ec
DK		 1174 break;
1175#endif
03010a33 1176#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1177 case Opt_acl:
1178 set_opt(sbi->s_mount_opt, POSIX_ACL);
1179 break;
1180 case Opt_noacl:
1181 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1182 break;
1183#else
1184 case Opt_acl:
1185 case Opt_noacl:
4776004f
TT		 1186 printk(KERN_ERR "EXT4 (no)acl options "
1187 "not supported\n");
ac27a0ec
DK		 1188 break;
1189#endif
1190 case Opt_reservation:
1191 set_opt(sbi->s_mount_opt, RESERVATION);
1192 break;
1193 case Opt_noreservation:
1194 clear_opt(sbi->s_mount_opt, RESERVATION);
1195 break;
1196 case Opt_journal_update:
1197 /* @@@ FIXME */
1198 /* Eventually we will want to be able to create
1199 a journal file here. For now, only allow the
1200 user to specify an existing inode to be the
1201 journal file. */
1202 if (is_remount) {
617ba13b 1203 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1204 "journal on remount\n");
1205 return 0;
1206 }
2b2d6d01 1207 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec
DK		 1208 break;
1209 case Opt_journal_inum:
1210 if (is_remount) {
617ba13b 1211 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1212 "journal on remount\n");
1213 return 0;
1214 }
1215 if (match_int(&args[0], &option))
1216 return 0;
1217 *inum = option;
1218 break;
1219 case Opt_journal_dev:
1220 if (is_remount) {
617ba13b 1221 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1222 "journal on remount\n");
1223 return 0;
1224 }
1225 if (match_int(&args[0], &option))
1226 return 0;
1227 *journal_devnum = option;
1228 break;
818d276c
GS		 1229 case Opt_journal_checksum:
1230 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1231 break;
1232 case Opt_journal_async_commit:
1233 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1234 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1235 break;
ac27a0ec 1236 case Opt_noload:
2b2d6d01 1237 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1238 break;
1239 case Opt_commit:
1240 if (match_int(&args[0], &option))
1241 return 0;
1242 if (option < 0)
1243 return 0;
1244 if (option == 0)
cd02ff0b 1245 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1246 sbi->s_commit_interval = HZ * option;
1247 break;
30773840
TT		 1248 case Opt_max_batch_time:
1249 if (match_int(&args[0], &option))
1250 return 0;
1251 if (option < 0)
1252 return 0;
1253 if (option == 0)
1254 option = EXT4_DEF_MAX_BATCH_TIME;
1255 sbi->s_max_batch_time = option;
1256 break;
1257 case Opt_min_batch_time:
1258 if (match_int(&args[0], &option))
1259 return 0;
1260 if (option < 0)
1261 return 0;
1262 sbi->s_min_batch_time = option;
1263 break;
ac27a0ec 1264 case Opt_data_journal:
617ba13b 1265 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1266 goto datacheck;
1267 case Opt_data_ordered:
617ba13b 1268 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1269 goto datacheck;
1270 case Opt_data_writeback:
617ba13b 1271 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1272 datacheck:
1273 if (is_remount) {
617ba13b 1274 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1275 != data_opt) {
1276 printk(KERN_ERR
617ba13b 1277 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1278 "mode on remount\n");
1279 return 0;
1280 }
1281 } else {
617ba13b 1282 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1283 sbi->s_mount_opt |= data_opt;
1284 }
1285 break;
5bf5683a
HK		 1286 case Opt_data_err_abort:
1287 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1288 break;
1289 case Opt_data_err_ignore:
1290 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1291 break;
ac27a0ec
DK		 1292#ifdef CONFIG_QUOTA
1293 case Opt_usrjquota:
1294 qtype = USRQUOTA;
1295 goto set_qf_name;
1296 case Opt_grpjquota:
1297 qtype = GRPQUOTA;
1298set_qf_name:
dfc5d03f
JK		 1299 if ((sb_any_quota_enabled(sb) ||
1300 sb_any_quota_suspended(sb)) &&
1301 !sbi->s_qf_names[qtype]) {
ac27a0ec 1302 printk(KERN_ERR
4776004f
TT		 1303 "EXT4-fs: Cannot change journaled "
1304 "quota options when quota turned on.\n");
ac27a0ec
DK		 1305 return 0;
1306 }
1307 qname = match_strdup(&args[0]);
1308 if (!qname) {
1309 printk(KERN_ERR
617ba13b 1310 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1311 "storing quotafile name.\n");
1312 return 0;
1313 }
1314 if (sbi->s_qf_names[qtype] &&
1315 strcmp(sbi->s_qf_names[qtype], qname)) {
1316 printk(KERN_ERR
617ba13b 1317 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1318 "specified.\n", QTYPE2NAME(qtype));
1319 kfree(qname);
1320 return 0;
1321 }
1322 sbi->s_qf_names[qtype] = qname;
1323 if (strchr(sbi->s_qf_names[qtype], '/')) {
1324 printk(KERN_ERR
617ba13b 1325 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1326 "filesystem root.\n");
1327 kfree(sbi->s_qf_names[qtype]);
1328 sbi->s_qf_names[qtype] = NULL;
1329 return 0;
1330 }
1331 set_opt(sbi->s_mount_opt, QUOTA);
1332 break;
1333 case Opt_offusrjquota:
1334 qtype = USRQUOTA;
1335 goto clear_qf_name;
1336 case Opt_offgrpjquota:
1337 qtype = GRPQUOTA;
1338clear_qf_name:
dfc5d03f
JK		 1339 if ((sb_any_quota_enabled(sb) ||
1340 sb_any_quota_suspended(sb)) &&
1341 sbi->s_qf_names[qtype]) {
617ba13b 1342 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1343 "journaled quota options when "
ac27a0ec
DK		 1344 "quota turned on.\n");
1345 return 0;
1346 }
1347 /*
1348 * The space will be released later when all options
1349 * are confirmed to be correct
1350 */
1351 sbi->s_qf_names[qtype] = NULL;
1352 break;
1353 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1354 qfmt = QFMT_VFS_OLD;
1355 goto set_qf_format;
ac27a0ec 1356 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1357 qfmt = QFMT_VFS_V0;
1358set_qf_format:
1359 if ((sb_any_quota_enabled(sb) ||
1360 sb_any_quota_suspended(sb)) &&
1361 sbi->s_jquota_fmt != qfmt) {
1362 printk(KERN_ERR "EXT4-fs: Cannot change "
1363 "journaled quota options when "
1364 "quota turned on.\n");
1365 return 0;
1366 }
1367 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1368 break;
1369 case Opt_quota:
1370 case Opt_usrquota:
1371 set_opt(sbi->s_mount_opt, QUOTA);
1372 set_opt(sbi->s_mount_opt, USRQUOTA);
1373 break;
1374 case Opt_grpquota:
1375 set_opt(sbi->s_mount_opt, QUOTA);
1376 set_opt(sbi->s_mount_opt, GRPQUOTA);
1377 break;
1378 case Opt_noquota:
1379 if (sb_any_quota_enabled(sb)) {
617ba13b 1380 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1381 "options when quota turned on.\n");
1382 return 0;
1383 }
1384 clear_opt(sbi->s_mount_opt, QUOTA);
1385 clear_opt(sbi->s_mount_opt, USRQUOTA);
1386 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1387 break;
1388#else
1389 case Opt_quota:
1390 case Opt_usrquota:
1391 case Opt_grpquota:
cd59e7b9
JK		 1392 printk(KERN_ERR
1393 "EXT4-fs: quota options not supported.\n");
1394 break;
ac27a0ec
DK		 1395 case Opt_usrjquota:
1396 case Opt_grpjquota:
1397 case Opt_offusrjquota:
1398 case Opt_offgrpjquota:
1399 case Opt_jqfmt_vfsold:
1400 case Opt_jqfmt_vfsv0:
1401 printk(KERN_ERR
cd59e7b9 1402 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1403 "supported.\n");
1404 break;
1405 case Opt_noquota:
1406 break;
1407#endif
1408 case Opt_abort:
1409 set_opt(sbi->s_mount_opt, ABORT);
1410 break;
1411 case Opt_barrier:
1412 if (match_int(&args[0], &option))
1413 return 0;
1414 if (option)
1415 set_opt(sbi->s_mount_opt, BARRIER);
1416 else
1417 clear_opt(sbi->s_mount_opt, BARRIER);
1418 break;
1419 case Opt_ignore:
1420 break;
1421 case Opt_resize:
1422 if (!is_remount) {
617ba13b 1423 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1424 "for remount\n");
1425 return 0;
1426 }
1427 if (match_int(&args[0], &option) != 0)
1428 return 0;
1429 *n_blocks_count = option;
1430 break;
1431 case Opt_nobh:
1432 set_opt(sbi->s_mount_opt, NOBH);
1433 break;
1434 case Opt_bh:
1435 clear_opt(sbi->s_mount_opt, NOBH);
1436 break;
a86c6181 1437 case Opt_extents:
e4079a11
ES		 1438 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1439 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1440 ext4_warning(sb, __func__,
1441 "extents feature not enabled "
fde4d95a 1442 "on this filesystem, use tune2fs");
e4079a11
ES		 1443 return 0;
1444 }
2b2d6d01 1445 set_opt(sbi->s_mount_opt, EXTENTS);
a86c6181 1446 break;
1e2462f9 1447 case Opt_noextents:
c07651b5
AK		 1448 /*
1449 * When e2fsprogs support resizing an already existing
1450 * ext3 file system to greater than 2**32 we need to
1451 * add support to block allocator to handle growing
1452 * already existing block mapped inode so that blocks
1453 * allocated for them fall within 2**32
1454 */
1455 last_block = ext4_blocks_count(sbi->s_es) - 1;
1456 if (last_block > 0xffffffffULL) {
1457 printk(KERN_ERR "EXT4-fs: Filesystem too "
1458 "large to mount with "
1459 "-o noextents options\n");
1460 return 0;
1461 }
2b2d6d01 1462 clear_opt(sbi->s_mount_opt, EXTENTS);
1e2462f9 1463 break;
25ec56b5
JNC		 1464 case Opt_i_version:
1465 set_opt(sbi->s_mount_opt, I_VERSION);
1466 sb->s_flags |= MS_I_VERSION;
1467 break;
dd919b98
AK		 1468 case Opt_nodelalloc:
1469 clear_opt(sbi->s_mount_opt, DELALLOC);
1470 break;
c9de560d
AT		 1471 case Opt_stripe:
1472 if (match_int(&args[0], &option))
1473 return 0;
1474 if (option < 0)
1475 return 0;
1476 sbi->s_stripe = option;
1477 break;
64769240
AT		 1478 case Opt_delalloc:
1479 set_opt(sbi->s_mount_opt, DELALLOC);
1480 break;
240799cd
TT		 1481 case Opt_inode_readahead_blks:
1482 if (match_int(&args[0], &option))
1483 return 0;
1484 if (option < 0 || option > (1 << 30))
1485 return 0;
1486 sbi->s_inode_readahead_blks = option;
1487 break;
ac27a0ec 1488 default:
2b2d6d01
TT		 1489 printk(KERN_ERR
1490 "EXT4-fs: Unrecognized mount option \"%s\" "
1491 "or missing value\n", p);
ac27a0ec
DK		 1492 return 0;
1493 }
1494 }
1495#ifdef CONFIG_QUOTA
1496 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1497 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1498 sbi->s_qf_names[USRQUOTA])
1499 clear_opt(sbi->s_mount_opt, USRQUOTA);
1500
617ba13b 1501 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1502 sbi->s_qf_names[GRPQUOTA])
1503 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1504
1505 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1506 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1507 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1508 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1509 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1510 "format mixing.\n");
1511 return 0;
1512 }
1513
1514 if (!sbi->s_jquota_fmt) {
2c8be6b2 1515 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1516 "not specified.\n");
1517 return 0;
1518 }
1519 } else {
1520 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1521 printk(KERN_ERR "EXT4-fs: journaled quota format "
1522 "specified with no journaling "
ac27a0ec
DK		 1523 "enabled.\n");
1524 return 0;
1525 }
1526 }
1527#endif
1528 return 1;
1529}
1530
617ba13b 1531static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1532 int read_only)
1533{
617ba13b 1534 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1535 int res = 0;
1536
617ba13b 1537 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1538 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1539 "forcing read-only mode\n");
ac27a0ec
DK		 1540 res = MS_RDONLY;
1541 }
1542 if (read_only)
1543 return res;
617ba13b 1544 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1545 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1546 "running e2fsck is recommended\n");
617ba13b 1547 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1548 printk(KERN_WARNING
1549 "EXT4-fs warning: mounting fs with errors, "
1550 "running e2fsck is recommended\n");
ac27a0ec
DK		 1551 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1552 le16_to_cpu(es->s_mnt_count) >=
1553 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1554 printk(KERN_WARNING
1555 "EXT4-fs warning: maximal mount count reached, "
1556 "running e2fsck is recommended\n");
ac27a0ec
DK		 1557 else if (le32_to_cpu(es->s_checkinterval) &&
1558 (le32_to_cpu(es->s_lastcheck) +
1559 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1560 printk(KERN_WARNING
1561 "EXT4-fs warning: checktime reached, "
1562 "running e2fsck is recommended\n");
0390131b
FM		 1563 if (!sbi->s_journal)
1564 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1565 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1566 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1567 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1568 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1569 ext4_update_dynamic_rev(sb);
0390131b
FM		 1570 if (sbi->s_journal)
1571 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1572
617ba13b 1573 ext4_commit_super(sb, es, 1);
ac27a0ec 1574 if (test_opt(sb, DEBUG))
a9df9a49 1575 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
ac27a0ec
DK		 1576 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1577 sb->s_blocksize,
1578 sbi->s_groups_count,
617ba13b
MC		 1579 EXT4_BLOCKS_PER_GROUP(sb),
1580 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1581 sbi->s_mount_opt);
1582
0390131b
FM		 1583 if (EXT4_SB(sb)->s_journal) {
1584 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1585 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1586 "external", EXT4_SB(sb)->s_journal->j_devname);
1587 } else {
1588 printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
1589 }
ac27a0ec
DK		 1590 return res;
1591}
1592
772cb7c8
JS		 1593static int ext4_fill_flex_info(struct super_block *sb)
1594{
1595 struct ext4_sb_info *sbi = EXT4_SB(sb);
1596 struct ext4_group_desc *gdp = NULL;
1597 struct buffer_head *bh;
1598 ext4_group_t flex_group_count;
1599 ext4_group_t flex_group;
1600 int groups_per_flex = 0;
772cb7c8
JS		 1601 int i;
1602
1603 if (!sbi->s_es->s_log_groups_per_flex) {
1604 sbi->s_log_groups_per_flex = 0;
1605 return 1;
1606 }
1607
1608 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1609 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1610
c62a11fd
FB		 1611 /* We allocate both existing and potentially added groups */
1612 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1613 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1614 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
ec05e868 1615 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1616 sizeof(struct flex_groups), GFP_KERNEL);
1617 if (sbi->s_flex_groups == NULL) {
ec05e868 1618 printk(KERN_ERR "EXT4-fs: not enough memory for "
a9df9a49 1619 "%u flex groups\n", flex_group_count);
772cb7c8
JS		 1620 goto failed;
1621 }
772cb7c8 1622
772cb7c8
JS		 1623 for (i = 0; i < sbi->s_groups_count; i++) {
1624 gdp = ext4_get_group_desc(sb, i, &bh);
1625
1626 flex_group = ext4_flex_group(sbi, i);
1627 sbi->s_flex_groups[flex_group].free_inodes +=
560671a0 1628 ext4_free_inodes_count(sb, gdp);
772cb7c8 1629 sbi->s_flex_groups[flex_group].free_blocks +=
560671a0 1630 ext4_free_blks_count(sb, gdp);
772cb7c8
JS		 1631 }
1632
1633 return 1;
1634failed:
1635 return 0;
1636}
1637
717d50e4
AD		 1638__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1639 struct ext4_group_desc *gdp)
1640{
1641 __u16 crc = 0;
1642
1643 if (sbi->s_es->s_feature_ro_compat &
1644 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1645 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1646 __le32 le_group = cpu_to_le32(block_group);
1647
1648 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1649 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1650 crc = crc16(crc, (__u8 *)gdp, offset);
1651 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1652 /* for checksum of struct ext4_group_desc do the rest...*/
1653 if ((sbi->s_es->s_feature_incompat &
1654 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1655 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1656 crc = crc16(crc, (__u8 *)gdp + offset,
1657 le16_to_cpu(sbi->s_es->s_desc_size) -
1658 offset);
1659 }
1660
1661 return cpu_to_le16(crc);
1662}
1663
1664int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1665 struct ext4_group_desc *gdp)
1666{
1667 if ((sbi->s_es->s_feature_ro_compat &
1668 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1669 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1670 return 0;
1671
1672 return 1;
1673}
1674
ac27a0ec 1675/* Called at mount-time, super-block is locked */
197cd65a 1676static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1677{
617ba13b
MC		 1678 struct ext4_sb_info *sbi = EXT4_SB(sb);
1679 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1680 ext4_fsblk_t last_block;
bd81d8ee
LV		 1681 ext4_fsblk_t block_bitmap;
1682 ext4_fsblk_t inode_bitmap;
1683 ext4_fsblk_t inode_table;
ce421581 1684 int flexbg_flag = 0;
fd2d4291 1685 ext4_group_t i;
ac27a0ec 1686
ce421581
JS		 1687 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1688 flexbg_flag = 1;
1689
af5bc92d 1690 ext4_debug("Checking group descriptors");
ac27a0ec 1691
197cd65a
AM		 1692 for (i = 0; i < sbi->s_groups_count; i++) {
1693 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1694
ce421581 1695 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1696 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1697 else
1698 last_block = first_block +
617ba13b 1699 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1700
8fadc143 1701 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1702 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0 1703 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1704 "Block bitmap for group %u not in group "
5128273a 1705 "(block %llu)!\n", i, block_bitmap);
ac27a0ec
DK		 1706 return 0;
1707 }
8fadc143 1708 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1709 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0 1710 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1711 "Inode bitmap for group %u not in group "
5128273a 1712 "(block %llu)!\n", i, inode_bitmap);
ac27a0ec
DK		 1713 return 0;
1714 }
8fadc143 1715 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1716 if (inode_table < first_block ||
2b2d6d01 1717 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0 1718 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1719 "Inode table for group %u not in group "
5128273a 1720 "(block %llu)!\n", i, inode_table);
ac27a0ec
DK		 1721 return 0;
1722 }
b5f10eed 1723 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1724 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0 1725 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1726 "Checksum for group %u failed (%u!=%u)\n",
c19204b0
JB		 1727 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1728 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c
LZ		 1729 if (!(sb->s_flags & MS_RDONLY)) {
1730 spin_unlock(sb_bgl_lock(sbi, i));
8a266467 1731 return 0;
7ee1ec4c 1732 }
717d50e4 1733 }
b5f10eed 1734 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1735 if (!flexbg_flag)
1736 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1737 }
1738
bd81d8ee 1739 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1740 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1741 return 1;
1742}
1743
617ba13b 1744/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1745 * the superblock) which were deleted from all directories, but held open by
1746 * a process at the time of a crash. We walk the list and try to delete these
1747 * inodes at recovery time (only with a read-write filesystem).
1748 *
1749 * In order to keep the orphan inode chain consistent during traversal (in
1750 * case of crash during recovery), we link each inode into the superblock
1751 * orphan list_head and handle it the same way as an inode deletion during
1752 * normal operation (which journals the operations for us).
1753 *
1754 * We only do an iget() and an iput() on each inode, which is very safe if we
1755 * accidentally point at an in-use or already deleted inode. The worst that
1756 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1757 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1758 * e2fsck was run on this filesystem, and it must have already done the orphan
1759 * inode cleanup for us, so we can safely abort without any further action.
1760 */
2b2d6d01
TT		 1761static void ext4_orphan_cleanup(struct super_block *sb,
1762 struct ext4_super_block *es)
ac27a0ec
DK		 1763{
1764 unsigned int s_flags = sb->s_flags;
1765 int nr_orphans = 0, nr_truncates = 0;
1766#ifdef CONFIG_QUOTA
1767 int i;
1768#endif
1769 if (!es->s_last_orphan) {
1770 jbd_debug(4, "no orphan inodes to clean up\n");
1771 return;
1772 }
1773
a8f48a95
ES		 1774 if (bdev_read_only(sb->s_bdev)) {
1775 printk(KERN_ERR "EXT4-fs: write access "
1776 "unavailable, skipping orphan cleanup.\n");
1777 return;
1778 }
1779
617ba13b 1780 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1781 if (es->s_last_orphan)
1782 jbd_debug(1, "Errors on filesystem, "
1783 "clearing orphan list.\n");
1784 es->s_last_orphan = 0;
1785 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1786 return;
1787 }
1788
1789 if (s_flags & MS_RDONLY) {
617ba13b 1790 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1791 sb->s_id);
1792 sb->s_flags &= ~MS_RDONLY;
1793 }
1794#ifdef CONFIG_QUOTA
1795 /* Needed for iput() to work correctly and not trash data */
1796 sb->s_flags |= MS_ACTIVE;
1797 /* Turn on quotas so that they are updated correctly */
1798 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1799 if (EXT4_SB(sb)->s_qf_names[i]) {
1800 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1801 if (ret < 0)
1802 printk(KERN_ERR
2c8be6b2 1803 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1804 "quota: error %d\n", ret);
1805 }
1806 }
1807#endif
1808
1809 while (es->s_last_orphan) {
1810 struct inode *inode;
1811
97bd42b9
JB		 1812 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1813 if (IS_ERR(inode)) {
ac27a0ec
DK		 1814 es->s_last_orphan = 0;
1815 break;
1816 }
1817
617ba13b 1818 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1819 DQUOT_INIT(inode);
1820 if (inode->i_nlink) {
1821 printk(KERN_DEBUG
e5f8eab8 1822 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1823 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1824 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1825 inode->i_ino, inode->i_size);
617ba13b 1826 ext4_truncate(inode);
ac27a0ec
DK		 1827 nr_truncates++;
1828 } else {
1829 printk(KERN_DEBUG
1830 "%s: deleting unreferenced inode %lu\n",
46e665e9 1831 __func__, inode->i_ino);
ac27a0ec
DK		 1832 jbd_debug(2, "deleting unreferenced inode %lu\n",
1833 inode->i_ino);
1834 nr_orphans++;
1835 }
1836 iput(inode); /* The delete magic happens here! */
1837 }
1838
2b2d6d01 1839#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1840
1841 if (nr_orphans)
617ba13b 1842 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1843 sb->s_id, PLURAL(nr_orphans));
1844 if (nr_truncates)
617ba13b 1845 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1846 sb->s_id, PLURAL(nr_truncates));
1847#ifdef CONFIG_QUOTA
1848 /* Turn quotas off */
1849 for (i = 0; i < MAXQUOTAS; i++) {
1850 if (sb_dqopt(sb)->files[i])
6f28e087 1851 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1852 }
1853#endif
1854 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1855}
cd2291a4
ES		 1856/*
1857 * Maximal extent format file size.
1858 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1859 * extent format containers, within a sector_t, and within i_blocks
1860 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1861 * so that won't be a limiting factor.
1862 *
1863 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1864 */
f287a1a5 1865static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1866{
1867 loff_t res;
1868 loff_t upper_limit = MAX_LFS_FILESIZE;
1869
1870 /* small i_blocks in vfs inode? */
f287a1a5 1871 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 1872 /*
b3a6ffe1 1873 * CONFIG_LBD is not enabled implies the inode
cd2291a4
ES		 1874 * i_block represent total blocks in 512 bytes
1875 * 32 == size of vfs inode i_blocks * 8
1876 */
1877 upper_limit = (1LL << 32) - 1;
1878
1879 /* total blocks in file system block size */
1880 upper_limit >>= (blkbits - 9);
1881 upper_limit <<= blkbits;
1882 }
1883
1884 /* 32-bit extent-start container, ee_block */
1885 res = 1LL << 32;
1886 res <<= blkbits;
1887 res -= 1;
1888
1889 /* Sanity check against vm- & vfs- imposed limits */
1890 if (res > upper_limit)
1891 res = upper_limit;
1892
1893 return res;
1894}
ac27a0ec 1895
ac27a0ec 1896/*
cd2291a4 1897 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1898 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1899 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1900 */
f287a1a5 1901static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 1902{
617ba13b 1903 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1904 int meta_blocks;
1905 loff_t upper_limit;
1906 /* This is calculated to be the largest file size for a
cd2291a4 1907 * dense, bitmapped file such that the total number of
ac27a0ec 1908 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1909 * does not exceed 2^48 -1
1910 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1911 * total number of 512 bytes blocks of the file
1912 */
1913
f287a1a5 1914 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 1915 /*
b3a6ffe1 1916 * !has_huge_files or CONFIG_LBD is not enabled
f287a1a5
TT		 1917 * implies the inode i_block represent total blocks in
1918 * 512 bytes 32 == size of vfs inode i_blocks * 8
0fc1b451
AK		 1919 */
1920 upper_limit = (1LL << 32) - 1;
1921
1922 /* total blocks in file system block size */
1923 upper_limit >>= (bits - 9);
1924
1925 } else {
8180a562
AK		 1926 /*
1927 * We use 48 bit ext4_inode i_blocks
1928 * With EXT4_HUGE_FILE_FL set the i_blocks
1929 * represent total number of blocks in
1930 * file system block size
1931 */
0fc1b451
AK		 1932 upper_limit = (1LL << 48) - 1;
1933
0fc1b451
AK		 1934 }
1935
1936 /* indirect blocks */
1937 meta_blocks = 1;
1938 /* double indirect blocks */
1939 meta_blocks += 1 + (1LL << (bits-2));
1940 /* tripple indirect blocks */
1941 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1942
1943 upper_limit -= meta_blocks;
1944 upper_limit <<= bits;
ac27a0ec
DK		 1945
1946 res += 1LL << (bits-2);
1947 res += 1LL << (2*(bits-2));
1948 res += 1LL << (3*(bits-2));
1949 res <<= bits;
1950 if (res > upper_limit)
1951 res = upper_limit;
0fc1b451
AK		 1952
1953 if (res > MAX_LFS_FILESIZE)
1954 res = MAX_LFS_FILESIZE;
1955
ac27a0ec
DK		 1956 return res;
1957}
1958
617ba13b 1959static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1960 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1961{
617ba13b 1962 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1963 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1964 int has_super = 0;
1965
1966 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1967
617ba13b 1968 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1969 nr < first_meta_bg)
70bbb3e0 1970 return logical_sb_block + nr + 1;
ac27a0ec 1971 bg = sbi->s_desc_per_block * nr;
617ba13b 1972 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1973 has_super = 1;
617ba13b 1974 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1975}
1976
c9de560d
AT		 1977/**
1978 * ext4_get_stripe_size: Get the stripe size.
1979 * @sbi: In memory super block info
1980 *
1981 * If we have specified it via mount option, then
1982 * use the mount option value. If the value specified at mount time is
1983 * greater than the blocks per group use the super block value.
1984 * If the super block value is greater than blocks per group return 0.
1985 * Allocator needs it be less than blocks per group.
1986 *
1987 */
1988static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1989{
1990 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1991 unsigned long stripe_width =
1992 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1993
1994 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1995 return sbi->s_stripe;
1996
1997 if (stripe_width <= sbi->s_blocks_per_group)
1998 return stripe_width;
1999
2000 if (stride <= sbi->s_blocks_per_group)
2001 return stride;
2002
2003 return 0;
2004}
ac27a0ec 2005
2b2d6d01 2006static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2007 __releases(kernel_lock)
2008 __acquires(kernel_lock)
1d03ec98 2009
ac27a0ec 2010{
2b2d6d01 2011 struct buffer_head *bh;
617ba13b
MC		 2012 struct ext4_super_block *es = NULL;
2013 struct ext4_sb_info *sbi;
2014 ext4_fsblk_t block;
2015 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2016 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 2017 unsigned long offset = 0;
2018 unsigned int journal_inum = 0;
2019 unsigned long journal_devnum = 0;
2020 unsigned long def_mount_opts;
2021 struct inode *root;
9f6200bb 2022 char *cp;
0390131b 2023 const char *descr;
1d1fe1ee 2024 int ret = -EINVAL;
ac27a0ec 2025 int blocksize;
ac27a0ec
DK		 2026 int db_count;
2027 int i;
f287a1a5 2028 int needs_recovery, has_huge_files;
3a06d778 2029 int features;
bd81d8ee 2030 __u64 blocks_count;
833f4077 2031 int err;
ac27a0ec
DK		 2032
2033 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2034 if (!sbi)
2035 return -ENOMEM;
2036 sb->s_fs_info = sbi;
2037 sbi->s_mount_opt = 0;
617ba13b
MC		 2038 sbi->s_resuid = EXT4_DEF_RESUID;
2039 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2040 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2041 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 2042
2043 unlock_kernel();
2044
9f6200bb
TT		 2045 /* Cleanup superblock name */
2046 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2047 *cp = '!';
2048
617ba13b 2049 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2050 if (!blocksize) {
617ba13b 2051 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 2052 goto out_fail;
2053 }
2054
2055 /*
617ba13b 2056 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2057 * block sizes. We need to calculate the offset from buffer start.
2058 */
617ba13b 2059 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2060 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2061 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2062 } else {
70bbb3e0 2063 logical_sb_block = sb_block;
ac27a0ec
DK		 2064 }
2065
70bbb3e0 2066 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 2067 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 2068 goto out_fail;
2069 }
2070 /*
2071 * Note: s_es must be initialized as soon as possible because
617ba13b 2072 * some ext4 macro-instructions depend on its value
ac27a0ec 2073 */
617ba13b 2074 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2075 sbi->s_es = es;
2076 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2077 if (sb->s_magic != EXT4_SUPER_MAGIC)
2078 goto cantfind_ext4;
ac27a0ec
DK		 2079
2080 /* Set defaults before we parse the mount options */
2081 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2082 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2083 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2084 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2085 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2086 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2087 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2088#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2089 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2090 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2091#endif
03010a33 2092#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2093 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2094 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2095#endif
617ba13b
MC		 2096 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2097 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2098 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2099 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2100 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2101 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2102
2103 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2104 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2105 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2106 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2107 else
2108 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2109
2110 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2111 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2112 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2113 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2114 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec
DK		 2115
2116 set_opt(sbi->s_mount_opt, RESERVATION);
571640ca 2117 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2118
1e2462f9
MC		 2119 /*
2120 * turn on extents feature by default in ext4 filesystem
e4079a11
ES		 2121 * only if feature flag already set by mkfs or tune2fs.
2122 * Use -o noextents to turn it off
1e2462f9 2123 */
e4079a11
ES		 2124 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2125 set_opt(sbi->s_mount_opt, EXTENTS);
2126 else
2127 ext4_warning(sb, __func__,
2128 "extents feature not enabled on this filesystem, "
fde4d95a 2129 "use tune2fs.");
1e2462f9 2130
dd919b98
AK		 2131 /*
2132 * enable delayed allocation by default
2133 * Use -o nodelalloc to turn it off
2134 */
2135 set_opt(sbi->s_mount_opt, DELALLOC);
2136
2137
2b2d6d01
TT		 2138 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2139 NULL, 0))
ac27a0ec
DK		 2140 goto failed_mount;
2141
2142 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2143 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2144
617ba13b
MC		 2145 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2146 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2147 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2148 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2149 printk(KERN_WARNING
617ba13b 2150 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2151 "running e2fsck is recommended\n");
469108ff 2152
ac27a0ec
DK		 2153 /*
2154 * Check feature flags regardless of the revision level, since we
2155 * previously didn't change the revision level when setting the flags,
2156 * so there is a chance incompat flags are set on a rev 0 filesystem.
2157 */
617ba13b 2158 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2159 if (features) {
617ba13b 2160 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
3a06d778
AK		 2161 "unsupported optional features (%x).\n", sb->s_id,
2162 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2163 ~EXT4_FEATURE_INCOMPAT_SUPP));
ac27a0ec
DK		 2164 goto failed_mount;
2165 }
617ba13b 2166 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2167 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2168 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
3a06d778
AK		 2169 "unsupported optional features (%x).\n", sb->s_id,
2170 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2171 ~EXT4_FEATURE_RO_COMPAT_SUPP));
ac27a0ec
DK		 2172 goto failed_mount;
2173 }
f287a1a5
TT		 2174 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2175 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2176 if (has_huge_files) {
0fc1b451
AK		 2177 /*
2178 * Large file size enabled file system can only be
b3a6ffe1 2179 * mount if kernel is build with CONFIG_LBD
0fc1b451
AK		 2180 */
2181 if (sizeof(root->i_blocks) < sizeof(u64) &&
2182 !(sb->s_flags & MS_RDONLY)) {
2183 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2184 "files cannot be mounted read-write "
b3a6ffe1 2185 "without CONFIG_LBD.\n", sb->s_id);
0fc1b451
AK		 2186 goto failed_mount;
2187 }
2188 }
ac27a0ec
DK		 2189 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2190
617ba13b
MC		 2191 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2192 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2193 printk(KERN_ERR
617ba13b 2194 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2195 blocksize, sb->s_id);
2196 goto failed_mount;
2197 }
2198
ac27a0ec 2199 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2200
2201 /* Validate the filesystem blocksize */
2202 if (!sb_set_blocksize(sb, blocksize)) {
2203 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2204 blocksize);
ac27a0ec
DK		 2205 goto failed_mount;
2206 }
2207
2b2d6d01 2208 brelse(bh);
70bbb3e0
AM		 2209 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2210 offset = do_div(logical_sb_block, blocksize);
2211 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2212 if (!bh) {
2213 printk(KERN_ERR
617ba13b 2214 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2215 goto failed_mount;
2216 }
617ba13b 2217 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2218 sbi->s_es = es;
617ba13b 2219 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2220 printk(KERN_ERR
2221 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2222 goto failed_mount;
2223 }
2224 }
2225
f287a1a5
TT		 2226 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2227 has_huge_files);
2228 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2229
617ba13b
MC		 2230 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2231 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2232 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2233 } else {
2234 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2235 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2236 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2237 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2238 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2239 printk(KERN_ERR
2240 "EXT4-fs: unsupported inode size: %d\n",
2241 sbi->s_inode_size);
ac27a0ec
DK		 2242 goto failed_mount;
2243 }
ef7f3835
KS		 2244 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2245 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2246 }
0d1ee42f
AR		 2247 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2248 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2249 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2250 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2251 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2252 printk(KERN_ERR
8fadc143 2253 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2254 sbi->s_desc_size);
2255 goto failed_mount;
2256 }
2257 } else
2258 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2259 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2260 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2261 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2262 goto cantfind_ext4;
2263 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2264 if (sbi->s_inodes_per_block == 0)
617ba13b 2265 goto cantfind_ext4;
ac27a0ec
DK		 2266 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2267 sbi->s_inodes_per_block;
0d1ee42f 2268 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2269 sbi->s_sbh = bh;
2270 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2271 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2272 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2273 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2274 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2275 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2276 i = le32_to_cpu(es->s_flags);
2277 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2278 sbi->s_hash_unsigned = 3;
2279 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2280#ifdef __CHAR_UNSIGNED__
2281 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2282 sbi->s_hash_unsigned = 3;
2283#else
2284 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2285#endif
2286 sb->s_dirt = 1;
2287 }
ac27a0ec
DK		 2288
2289 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2290 printk(KERN_ERR
2291 "EXT4-fs: #blocks per group too big: %lu\n",
2292 sbi->s_blocks_per_group);
ac27a0ec
DK		 2293 goto failed_mount;
2294 }
ac27a0ec 2295 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2296 printk(KERN_ERR
2297 "EXT4-fs: #inodes per group too big: %lu\n",
2298 sbi->s_inodes_per_group);
ac27a0ec
DK		 2299 goto failed_mount;
2300 }
2301
bd81d8ee 2302 if (ext4_blocks_count(es) >
ac27a0ec 2303 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2304 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2305 " too large to mount safely\n", sb->s_id);
2306 if (sizeof(sector_t) < 8)
617ba13b 2307 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2308 "enabled\n");
2309 goto failed_mount;
2310 }
2311
617ba13b
MC		 2312 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2313 goto cantfind_ext4;
e7c95593
ES		 2314
2315 /* ensure blocks_count calculation below doesn't sign-extend */
2316 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2317 le32_to_cpu(es->s_first_data_block) + 1) {
2318 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2319 "first data block %u, blocks per group %lu\n",
2320 ext4_blocks_count(es),
2321 le32_to_cpu(es->s_first_data_block),
2322 EXT4_BLOCKS_PER_GROUP(sb));
2323 goto failed_mount;
2324 }
bd81d8ee
LV		 2325 blocks_count = (ext4_blocks_count(es) -
2326 le32_to_cpu(es->s_first_data_block) +
2327 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2328 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2329 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2330 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2331 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2332 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2333 GFP_KERNEL);
2334 if (sbi->s_group_desc == NULL) {
2b2d6d01 2335 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2336 goto failed_mount;
2337 }
2338
3244fcb1 2339#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2340 if (ext4_proc_root)
2341 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2342
240799cd
TT		 2343 if (sbi->s_proc)
2344 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2345 &ext4_ui_proc_fops,
2346 &sbi->s_inode_readahead_blks);
3244fcb1 2347#endif
240799cd 2348
ac27a0ec
DK		 2349 bgl_lock_init(&sbi->s_blockgroup_lock);
2350
2351 for (i = 0; i < db_count; i++) {
70bbb3e0 2352 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2353 sbi->s_group_desc[i] = sb_bread(sb, block);
2354 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2355 printk(KERN_ERR "EXT4-fs: "
2356 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2357 db_count = i;
2358 goto failed_mount2;
2359 }
2360 }
2b2d6d01 2361 if (!ext4_check_descriptors(sb)) {
617ba13b 2362 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2363 goto failed_mount2;
2364 }
772cb7c8
JS		 2365 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2366 if (!ext4_fill_flex_info(sb)) {
2367 printk(KERN_ERR
2368 "EXT4-fs: unable to initialize "
2369 "flex_bg meta info!\n");
2370 goto failed_mount2;
2371 }
2372
ac27a0ec
DK		 2373 sbi->s_gdb_count = db_count;
2374 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2375 spin_lock_init(&sbi->s_next_gen_lock);
2376
833f4077
PZ		 2377 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2378 ext4_count_free_blocks(sb));
2379 if (!err) {
2380 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2381 ext4_count_free_inodes(sb));
2382 }
2383 if (!err) {
2384 err = percpu_counter_init(&sbi->s_dirs_counter,
2385 ext4_count_dirs(sb));
2386 }
6bc6e63f
AK		 2387 if (!err) {
2388 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2389 }
833f4077
PZ		 2390 if (err) {
2391 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2392 goto failed_mount3;
2393 }
ac27a0ec 2394
c9de560d
AT		 2395 sbi->s_stripe = ext4_get_stripe_size(sbi);
2396
ac27a0ec
DK		 2397 /*
2398 * set up enough so that it can read an inode
2399 */
617ba13b
MC		 2400 sb->s_op = &ext4_sops;
2401 sb->s_export_op = &ext4_export_ops;
2402 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2403#ifdef CONFIG_QUOTA
617ba13b
MC		 2404 sb->s_qcop = &ext4_qctl_operations;
2405 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2406#endif
2407 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2408
2409 sb->s_root = NULL;
2410
2411 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2412 EXT4_HAS_INCOMPAT_FEATURE(sb,
2413 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2414
2415 /*
2416 * The first inode we look at is the journal inode. Don't try
2417 * root first: it may be modified in the journal!
2418 */
2419 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2420 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2421 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2422 goto failed_mount3;
624080ed
TT		 2423 if (!(sb->s_flags & MS_RDONLY) &&
2424 EXT4_SB(sb)->s_journal->j_failed_commit) {
2425 printk(KERN_CRIT "EXT4-fs error (device %s): "
2426 "ext4_fill_super: Journal transaction "
2b2d6d01 2427 "%u is corrupt\n", sb->s_id,
624080ed 2428 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2429 if (test_opt(sb, ERRORS_RO)) {
2430 printk(KERN_CRIT
2431 "Mounting filesystem read-only\n");
624080ed
TT		 2432 sb->s_flags |= MS_RDONLY;
2433 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2434 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2435 }
2436 if (test_opt(sb, ERRORS_PANIC)) {
2437 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2438 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2439 ext4_commit_super(sb, es, 1);
624080ed
TT		 2440 goto failed_mount4;
2441 }
2442 }
ac27a0ec 2443 } else if (journal_inum) {
617ba13b 2444 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec 2445 goto failed_mount3;
0390131b
FM		 2446 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2447 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2448 printk(KERN_ERR "EXT4-fs: required journal recovery "
2449 "suppressed and not mounted read-only\n");
2450 goto failed_mount4;
ac27a0ec 2451 } else {
0390131b
FM		 2452 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2453 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2454 sbi->s_journal = NULL;
2455 needs_recovery = 0;
2456 goto no_journal;
ac27a0ec
DK		 2457 }
2458
eb40a09c
JS		 2459 if (ext4_blocks_count(es) > 0xffffffffULL &&
2460 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2461 JBD2_FEATURE_INCOMPAT_64BIT)) {
2462 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2463 goto failed_mount4;
2464 }
2465
818d276c
GS		 2466 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2467 jbd2_journal_set_features(sbi->s_journal,
2468 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2469 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2470 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2471 jbd2_journal_set_features(sbi->s_journal,
2472 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2473 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2474 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2475 } else {
2476 jbd2_journal_clear_features(sbi->s_journal,
2477 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2478 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2479 }
2480
ac27a0ec
DK		 2481 /* We have now updated the journal if required, so we can
2482 * validate the data journaling mode. */
2483 switch (test_opt(sb, DATA_FLAGS)) {
2484 case 0:
2485 /* No mode set, assume a default based on the journal
63f57933
AM		 2486 * capabilities: ORDERED_DATA if the journal can
2487 * cope, else JOURNAL_DATA
2488 */
dab291af
MC		 2489 if (jbd2_journal_check_available_features
2490 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2491 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2492 else
2493 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2494 break;
2495
617ba13b
MC		 2496 case EXT4_MOUNT_ORDERED_DATA:
2497 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2498 if (!jbd2_journal_check_available_features
2499 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2500 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2501 "requested data journaling mode\n");
2502 goto failed_mount4;
2503 }
2504 default:
2505 break;
2506 }
2507
0390131b
FM		 2508no_journal:
2509
ac27a0ec 2510 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2511 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2512 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2513 "its supported only with writeback mode\n");
2514 clear_opt(sbi->s_mount_opt, NOBH);
2515 }
2516 }
2517 /*
dab291af 2518 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2519 * so we can safely mount the rest of the filesystem now.
2520 */
2521
1d1fe1ee
DH		 2522 root = ext4_iget(sb, EXT4_ROOT_INO);
2523 if (IS_ERR(root)) {
617ba13b 2524 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2525 ret = PTR_ERR(root);
ac27a0ec
DK		 2526 goto failed_mount4;
2527 }
2528 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2529 iput(root);
617ba13b 2530 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2531 goto failed_mount4;
2532 }
1d1fe1ee
DH		 2533 sb->s_root = d_alloc_root(root);
2534 if (!sb->s_root) {
2535 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2536 iput(root);
2537 ret = -ENOMEM;
2538 goto failed_mount4;
2539 }
ac27a0ec 2540
2b2d6d01 2541 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2542
2543 /* determine the minimum size of new large inodes, if present */
2544 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2545 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2546 EXT4_GOOD_OLD_INODE_SIZE;
2547 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2548 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2549 if (sbi->s_want_extra_isize <
2550 le16_to_cpu(es->s_want_extra_isize))
2551 sbi->s_want_extra_isize =
2552 le16_to_cpu(es->s_want_extra_isize);
2553 if (sbi->s_want_extra_isize <
2554 le16_to_cpu(es->s_min_extra_isize))
2555 sbi->s_want_extra_isize =
2556 le16_to_cpu(es->s_min_extra_isize);
2557 }
2558 }
2559 /* Check if enough inode space is available */
2560 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2561 sbi->s_inode_size) {
2562 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2563 EXT4_GOOD_OLD_INODE_SIZE;
2564 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2565 "available.\n");
2566 }
2567
c2774d84
AK		 2568 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2569 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2570 "requested data journaling mode\n");
2571 clear_opt(sbi->s_mount_opt, DELALLOC);
2572 } else if (test_opt(sb, DELALLOC))
2573 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2574
2575 ext4_ext_init(sb);
2576 err = ext4_mb_init(sb, needs_recovery);
2577 if (err) {
2578 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2579 err);
2580 goto failed_mount4;
2581 }
2582
ac27a0ec
DK		 2583 /*
2584 * akpm: core read_super() calls in here with the superblock locked.
2585 * That deadlocks, because orphan cleanup needs to lock the superblock
2586 * in numerous places. Here we just pop the lock - it's relatively
2587 * harmless, because we are now ready to accept write_super() requests,
2588 * and aviro says that's the only reason for hanging onto the
2589 * superblock lock.
2590 */
617ba13b
MC		 2591 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2592 ext4_orphan_cleanup(sb, es);
2593 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2594 if (needs_recovery) {
2b2d6d01 2595 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
0390131b
FM		 2596 ext4_mark_recovery_complete(sb, es);
2597 }
2598 if (EXT4_SB(sb)->s_journal) {
2599 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2600 descr = " journalled data mode";
2601 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2602 descr = " ordered data mode";
2603 else
2604 descr = " writeback data mode";
2605 } else
2606 descr = "out journal";
2607
2608 printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
2609 sb->s_id, descr);
ac27a0ec
DK		 2610
2611 lock_kernel();
2612 return 0;
2613
617ba13b 2614cantfind_ext4:
ac27a0ec 2615 if (!silent)
617ba13b 2616 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2617 sb->s_id);
2618 goto failed_mount;
2619
2620failed_mount4:
0390131b
FM		 2621 printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
2622 if (sbi->s_journal) {
2623 jbd2_journal_destroy(sbi->s_journal);
2624 sbi->s_journal = NULL;
2625 }
ac27a0ec
DK		 2626failed_mount3:
2627 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2628 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2629 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2630 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2631failed_mount2:
2632 for (i = 0; i < db_count; i++)
2633 brelse(sbi->s_group_desc[i]);
2634 kfree(sbi->s_group_desc);
2635failed_mount:
240799cd
TT		 2636 if (sbi->s_proc) {
2637 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
9f6200bb 2638 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2639 }
ac27a0ec
DK		 2640#ifdef CONFIG_QUOTA
2641 for (i = 0; i < MAXQUOTAS; i++)
2642 kfree(sbi->s_qf_names[i]);
2643#endif
617ba13b 2644 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2645 brelse(bh);
2646out_fail:
2647 sb->s_fs_info = NULL;
2648 kfree(sbi);
2649 lock_kernel();
1d1fe1ee 2650 return ret;
ac27a0ec
DK		 2651}
2652
2653/*
2654 * Setup any per-fs journal parameters now. We'll do this both on
2655 * initial mount, once the journal has been initialised but before we've
2656 * done any recovery; and again on any subsequent remount.
2657 */
617ba13b 2658static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2659{
617ba13b 2660 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 2661
30773840
TT		 2662 journal->j_commit_interval = sbi->s_commit_interval;
2663 journal->j_min_batch_time = sbi->s_min_batch_time;
2664 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 2665
2666 spin_lock(&journal->j_state_lock);
2667 if (test_opt(sb, BARRIER))
dab291af 2668 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2669 else
dab291af 2670 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 2671 if (test_opt(sb, DATA_ERR_ABORT))
2672 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2673 else
2674 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 2675 spin_unlock(&journal->j_state_lock);
2676}
2677
617ba13b 2678static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2679 unsigned int journal_inum)
2680{
2681 struct inode *journal_inode;
2682 journal_t *journal;
2683
0390131b
FM		 2684 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2685
ac27a0ec
DK		 2686 /* First, test for the existence of a valid inode on disk. Bad
2687 * things happen if we iget() an unused inode, as the subsequent
2688 * iput() will try to delete it. */
2689
1d1fe1ee
DH		 2690 journal_inode = ext4_iget(sb, journal_inum);
2691 if (IS_ERR(journal_inode)) {
617ba13b 2692 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2693 return NULL;
2694 }
2695 if (!journal_inode->i_nlink) {
2696 make_bad_inode(journal_inode);
2697 iput(journal_inode);
617ba13b 2698 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2699 return NULL;
2700 }
2701
e5f8eab8 2702 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2703 journal_inode, journal_inode->i_size);
1d1fe1ee 2704 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2705 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2706 iput(journal_inode);
2707 return NULL;
2708 }
2709
dab291af 2710 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2711 if (!journal) {
617ba13b 2712 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2713 iput(journal_inode);
2714 return NULL;
2715 }
2716 journal->j_private = sb;
617ba13b 2717 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2718 return journal;
2719}
2720
617ba13b 2721static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2722 dev_t j_dev)
2723{
2b2d6d01 2724 struct buffer_head *bh;
ac27a0ec 2725 journal_t *journal;
617ba13b
MC		 2726 ext4_fsblk_t start;
2727 ext4_fsblk_t len;
ac27a0ec 2728 int hblock, blocksize;
617ba13b 2729 ext4_fsblk_t sb_block;
ac27a0ec 2730 unsigned long offset;
2b2d6d01 2731 struct ext4_super_block *es;
ac27a0ec
DK		 2732 struct block_device *bdev;
2733
0390131b
FM		 2734 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2735
617ba13b 2736 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2737 if (bdev == NULL)
2738 return NULL;
2739
2740 if (bd_claim(bdev, sb)) {
2741 printk(KERN_ERR
8c55e204 2742 "EXT4: failed to claim external journal device.\n");
9a1c3542 2743 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 2744 return NULL;
2745 }
2746
2747 blocksize = sb->s_blocksize;
2748 hblock = bdev_hardsect_size(bdev);
2749 if (blocksize < hblock) {
2750 printk(KERN_ERR
617ba13b 2751 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2752 goto out_bdev;
2753 }
2754
617ba13b
MC		 2755 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2756 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2757 set_blocksize(bdev, blocksize);
2758 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2759 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2760 "external journal\n");
2761 goto out_bdev;
2762 }
2763
617ba13b
MC		 2764 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2765 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2766 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2767 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2768 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2769 "bad superblock\n");
2770 brelse(bh);
2771 goto out_bdev;
2772 }
2773
617ba13b
MC		 2774 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2775 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2776 brelse(bh);
2777 goto out_bdev;
2778 }
2779
bd81d8ee 2780 len = ext4_blocks_count(es);
ac27a0ec
DK		 2781 start = sb_block + 1;
2782 brelse(bh); /* we're done with the superblock */
2783
dab291af 2784 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2785 start, len, blocksize);
2786 if (!journal) {
617ba13b 2787 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2788 goto out_bdev;
2789 }
2790 journal->j_private = sb;
2791 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2792 wait_on_buffer(journal->j_sb_buffer);
2793 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2794 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2795 goto out_journal;
2796 }
2797 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2798 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2799 "user (unsupported) - %d\n",
2800 be32_to_cpu(journal->j_superblock->s_nr_users));
2801 goto out_journal;
2802 }
617ba13b
MC		 2803 EXT4_SB(sb)->journal_bdev = bdev;
2804 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2805 return journal;
2806out_journal:
dab291af 2807 jbd2_journal_destroy(journal);
ac27a0ec 2808out_bdev:
617ba13b 2809 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2810 return NULL;
2811}
2812
617ba13b
MC		 2813static int ext4_load_journal(struct super_block *sb,
2814 struct ext4_super_block *es,
ac27a0ec
DK		 2815 unsigned long journal_devnum)
2816{
2817 journal_t *journal;
2818 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2819 dev_t journal_dev;
2820 int err = 0;
2821 int really_read_only;
2822
0390131b
FM		 2823 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2824
ac27a0ec
DK		 2825 if (journal_devnum &&
2826 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2827 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2828 "numbers have changed\n");
2829 journal_dev = new_decode_dev(journal_devnum);
2830 } else
2831 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2832
2833 really_read_only = bdev_read_only(sb->s_bdev);
2834
2835 /*
2836 * Are we loading a blank journal or performing recovery after a
2837 * crash? For recovery, we need to check in advance whether we
2838 * can get read-write access to the device.
2839 */
2840
617ba13b 2841 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2842 if (sb->s_flags & MS_RDONLY) {
617ba13b 2843 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2844 "required on readonly filesystem.\n");
2845 if (really_read_only) {
617ba13b 2846 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2847 "unavailable, cannot proceed.\n");
2848 return -EROFS;
2849 }
2b2d6d01
TT		 2850 printk(KERN_INFO "EXT4-fs: write access will "
2851 "be enabled during recovery.\n");
ac27a0ec
DK		 2852 }
2853 }
2854
2855 if (journal_inum && journal_dev) {
617ba13b 2856 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2857 "and inode journals!\n");
2858 return -EINVAL;
2859 }
2860
2861 if (journal_inum) {
617ba13b 2862 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2863 return -EINVAL;
2864 } else {
617ba13b 2865 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2866 return -EINVAL;
2867 }
2868
4776004f
TT		 2869 if (journal->j_flags & JBD2_BARRIER)
2870 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2871 else
2872 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2873
ac27a0ec 2874 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2875 err = jbd2_journal_update_format(journal);
ac27a0ec 2876 if (err) {
617ba13b 2877 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2878 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2879 return err;
2880 }
2881 }
2882
617ba13b 2883 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2884 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2885 if (!err)
dab291af 2886 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2887
2888 if (err) {
617ba13b 2889 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2890 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2891 return err;
2892 }
2893
617ba13b
MC		 2894 EXT4_SB(sb)->s_journal = journal;
2895 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2896
2897 if (journal_devnum &&
2898 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2899 es->s_journal_dev = cpu_to_le32(journal_devnum);
2900 sb->s_dirt = 1;
2901
2902 /* Make sure we flush the recovery flag to disk. */
617ba13b 2903 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2904 }
2905
2906 return 0;
2907}
2908
2b2d6d01
TT		 2909static int ext4_create_journal(struct super_block *sb,
2910 struct ext4_super_block *es,
ac27a0ec
DK		 2911 unsigned int journal_inum)
2912{
2913 journal_t *journal;
6c675bd4 2914 int err;
ac27a0ec
DK		 2915
2916 if (sb->s_flags & MS_RDONLY) {
617ba13b 2917 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2918 "create journal.\n");
2919 return -EROFS;
2920 }
2921
6c675bd4
BP		 2922 journal = ext4_get_journal(sb, journal_inum);
2923 if (!journal)
ac27a0ec
DK		 2924 return -EINVAL;
2925
617ba13b 2926 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2927 journal_inum);
2928
6c675bd4
BP		 2929 err = jbd2_journal_create(journal);
2930 if (err) {
617ba13b 2931 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2932 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2933 return -EIO;
2934 }
2935
617ba13b 2936 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2937
617ba13b
MC		 2938 ext4_update_dynamic_rev(sb);
2939 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2940 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2941
2942 es->s_journal_inum = cpu_to_le32(journal_inum);
2943 sb->s_dirt = 1;
2944
2945 /* Make sure we flush the recovery flag to disk. */
617ba13b 2946 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2947
2948 return 0;
2949}
2950
2b2d6d01
TT		 2951static void ext4_commit_super(struct super_block *sb,
2952 struct ext4_super_block *es, int sync)
ac27a0ec 2953{
617ba13b 2954 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2955
2956 if (!sbh)
2957 return;
914258bf
TT		 2958 if (buffer_write_io_error(sbh)) {
2959 /*
2960 * Oh, dear. A previous attempt to write the
2961 * superblock failed. This could happen because the
2962 * USB device was yanked out. Or it could happen to
2963 * be a transient write error and maybe the block will
2964 * be remapped. Nothing we can do but to retry the
2965 * write and hope for the best.
2966 */
2967 printk(KERN_ERR "ext4: previous I/O error to "
2968 "superblock detected for %s.\n", sb->s_id);
2969 clear_buffer_write_io_error(sbh);
2970 set_buffer_uptodate(sbh);
2971 }
ac27a0ec 2972 es->s_wtime = cpu_to_le32(get_seconds());
5d1b1b3f
AK		 2973 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
2974 &EXT4_SB(sb)->s_freeblocks_counter));
2975 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
2976 &EXT4_SB(sb)->s_freeinodes_counter));
2977
ac27a0ec
DK		 2978 BUFFER_TRACE(sbh, "marking dirty");
2979 mark_buffer_dirty(sbh);
914258bf 2980 if (sync) {
ac27a0ec 2981 sync_dirty_buffer(sbh);
914258bf
TT		 2982 if (buffer_write_io_error(sbh)) {
2983 printk(KERN_ERR "ext4: I/O error while writing "
2984 "superblock for %s.\n", sb->s_id);
2985 clear_buffer_write_io_error(sbh);
2986 set_buffer_uptodate(sbh);
2987 }
2988 }
ac27a0ec
DK		 2989}
2990
2991
2992/*
2993 * Have we just finished recovery? If so, and if we are mounting (or
2994 * remounting) the filesystem readonly, then we will end up with a
2995 * consistent fs on disk. Record that fact.
2996 */
2b2d6d01
TT		 2997static void ext4_mark_recovery_complete(struct super_block *sb,
2998 struct ext4_super_block *es)
ac27a0ec 2999{
617ba13b 3000 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3001
0390131b
FM		 3002 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3003 BUG_ON(journal != NULL);
3004 return;
3005 }
dab291af 3006 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3007 if (jbd2_journal_flush(journal) < 0)
3008 goto out;
3009
32c37730 3010 lock_super(sb);
617ba13b 3011 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3012 sb->s_flags & MS_RDONLY) {
617ba13b 3013 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 3014 sb->s_dirt = 0;
617ba13b 3015 ext4_commit_super(sb, es, 1);
ac27a0ec 3016 }
32c37730 3017 unlock_super(sb);
7ffe1ea8
HK		 3018
3019out:
dab291af 3020 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3021}
3022
3023/*
3024 * If we are mounting (or read-write remounting) a filesystem whose journal
3025 * has recorded an error from a previous lifetime, move that error to the
3026 * main filesystem now.
3027 */
2b2d6d01
TT		 3028static void ext4_clear_journal_err(struct super_block *sb,
3029 struct ext4_super_block *es)
ac27a0ec
DK		 3030{
3031 journal_t *journal;
3032 int j_errno;
3033 const char *errstr;
3034
0390131b
FM		 3035 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3036
617ba13b 3037 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3038
3039 /*
3040 * Now check for any error status which may have been recorded in the
617ba13b 3041 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3042 */
3043
dab291af 3044 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3045 if (j_errno) {
3046 char nbuf[16];
3047
617ba13b 3048 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3049 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3050 "from previous mount: %s", errstr);
46e665e9 3051 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3052 "filesystem check.");
3053
617ba13b
MC		 3054 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3055 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 3056 ext4_commit_super(sb, es, 1);
ac27a0ec 3057
dab291af 3058 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3059 }
3060}
3061
3062/*
3063 * Force the running and committing transactions to commit,
3064 * and wait on the commit.
3065 */
617ba13b 3066int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3067{
3068 journal_t *journal;
0390131b 3069 int ret = 0;
ac27a0ec
DK		 3070
3071 if (sb->s_flags & MS_RDONLY)
3072 return 0;
3073
617ba13b 3074 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 3075 if (journal) {
3076 sb->s_dirt = 0;
3077 ret = ext4_journal_force_commit(journal);
3078 }
3079
ac27a0ec
DK		 3080 return ret;
3081}
3082
3083/*
617ba13b 3084 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec 3085 * have to propagate any other updates to the superblock on disk at this
14ce0cb4
TT		 3086 * point. (We can probably nuke this function altogether, and remove
3087 * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...)
ac27a0ec 3088 */
2b2d6d01 3089static void ext4_write_super(struct super_block *sb)
ac27a0ec 3090{
0390131b
FM		 3091 if (EXT4_SB(sb)->s_journal) {
3092 if (mutex_trylock(&sb->s_lock) != 0)
3093 BUG();
3094 sb->s_dirt = 0;
3095 } else {
3096 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3097 }
ac27a0ec
DK		 3098}
3099
617ba13b 3100static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3101{
14ce0cb4 3102 int ret = 0;
ac27a0ec 3103
ede86cc4 3104 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
ac27a0ec 3105 sb->s_dirt = 0;
0390131b
FM		 3106 if (EXT4_SB(sb)->s_journal) {
3107 if (wait)
3108 ret = ext4_force_commit(sb);
3109 else
3110 jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL);
3111 } else {
3112 ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait);
3113 }
14ce0cb4 3114 return ret;
ac27a0ec
DK		 3115}
3116
3117/*
3118 * LVM calls this function before a (read-only) snapshot is created. This
3119 * gives us a chance to flush the journal completely and mark the fs clean.
3120 */
617ba13b 3121static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 3122{
3123 sb->s_dirt = 0;
3124
3125 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 3126 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3127
0390131b
FM		 3128 if (journal) {
3129 /* Now we set up the journal barrier. */
3130 jbd2_journal_lock_updates(journal);
7ffe1ea8 3131
0390131b
FM		 3132 /*
3133 * We don't want to clear needs_recovery flag when we
3134 * failed to flush the journal.
3135 */
3136 if (jbd2_journal_flush(journal) < 0)
3137 return;
3138 }
ac27a0ec
DK		 3139
3140 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 3141 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3142 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 3143 }
3144}
3145
3146/*
3147 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3148 * flag here, even though the filesystem is not technically dirty yet.
3149 */
617ba13b 3150static void ext4_unlockfs(struct super_block *sb)
ac27a0ec 3151{
0390131b 3152 if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) {
ac27a0ec
DK		 3153 lock_super(sb);
3154 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 3155 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3156 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 3157 unlock_super(sb);
dab291af 3158 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 3159 }
3160}
3161
2b2d6d01 3162static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3163{
2b2d6d01 3164 struct ext4_super_block *es;
617ba13b
MC		 3165 struct ext4_sb_info *sbi = EXT4_SB(sb);
3166 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3167 unsigned long old_sb_flags;
617ba13b 3168 struct ext4_mount_options old_opts;
8a266467 3169 ext4_group_t g;
ac27a0ec
DK		 3170 int err;
3171#ifdef CONFIG_QUOTA
3172 int i;
3173#endif
3174
3175 /* Store the original options */
3176 old_sb_flags = sb->s_flags;
3177 old_opts.s_mount_opt = sbi->s_mount_opt;
3178 old_opts.s_resuid = sbi->s_resuid;
3179 old_opts.s_resgid = sbi->s_resgid;
3180 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3181 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3182 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3183#ifdef CONFIG_QUOTA
3184 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3185 for (i = 0; i < MAXQUOTAS; i++)
3186 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3187#endif
3188
3189 /*
3190 * Allow the "check" option to be passed as a remount option.
3191 */
3192 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
3193 err = -EINVAL;
3194 goto restore_opts;
3195 }
3196
617ba13b 3197 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3198 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3199
3200 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3201 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3202
3203 es = sbi->s_es;
3204
0390131b
FM		 3205 if (sbi->s_journal)
3206 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 3207
3208 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3209 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3210 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3211 err = -EROFS;
3212 goto restore_opts;
3213 }
3214
3215 if (*flags & MS_RDONLY) {
3216 /*
3217 * First of all, the unconditional stuff we have to do
3218 * to disable replay of the journal when we next remount
3219 */
3220 sb->s_flags |= MS_RDONLY;
3221
3222 /*
3223 * OK, test if we are remounting a valid rw partition
3224 * readonly, and if so set the rdonly flag and then
3225 * mark the partition as valid again.
3226 */
617ba13b
MC		 3227 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3228 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3229 es->s_state = cpu_to_le16(sbi->s_mount_state);
3230
32c37730
JK		 3231 /*
3232 * We have to unlock super so that we can wait for
3233 * transactions.
3234 */
0390131b
FM		 3235 if (sbi->s_journal) {
3236 unlock_super(sb);
3237 ext4_mark_recovery_complete(sb, es);
3238 lock_super(sb);
3239 }
ac27a0ec 3240 } else {
3a06d778 3241 int ret;
617ba13b
MC		 3242 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3243 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3244 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec 3245 "remount RDWR because of unsupported "
3a06d778
AK		 3246 "optional features (%x).\n", sb->s_id,
3247 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3248 ~EXT4_FEATURE_RO_COMPAT_SUPP));
ac27a0ec
DK		 3249 err = -EROFS;
3250 goto restore_opts;
3251 }
ead6596b 3252
8a266467
TT		 3253 /*
3254 * Make sure the group descriptor checksums
3255 * are sane. If they aren't, refuse to
3256 * remount r/w.
3257 */
3258 for (g = 0; g < sbi->s_groups_count; g++) {
3259 struct ext4_group_desc *gdp =
3260 ext4_get_group_desc(sb, g, NULL);
3261
3262 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3263 printk(KERN_ERR
3264 "EXT4-fs: ext4_remount: "
a9df9a49 3265 "Checksum for group %u failed (%u!=%u)\n",
8a266467
TT		 3266 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3267 le16_to_cpu(gdp->bg_checksum));
3268 err = -EINVAL;
3269 goto restore_opts;
3270 }
3271 }
3272
ead6596b
ES		 3273 /*
3274 * If we have an unprocessed orphan list hanging
3275 * around from a previously readonly bdev mount,
3276 * require a full umount/remount for now.
3277 */
3278 if (es->s_last_orphan) {
3279 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3280 "remount RDWR because of unprocessed "
3281 "orphan inode list. Please "
3282 "umount/remount instead.\n",
3283 sb->s_id);
3284 err = -EINVAL;
3285 goto restore_opts;
3286 }
3287
ac27a0ec
DK		 3288 /*
3289 * Mounting a RDONLY partition read-write, so reread
3290 * and store the current valid flag. (It may have
3291 * been changed by e2fsck since we originally mounted
3292 * the partition.)
3293 */
0390131b
FM		 3294 if (sbi->s_journal)
3295 ext4_clear_journal_err(sb, es);
ac27a0ec 3296 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3297 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3298 goto restore_opts;
2b2d6d01 3299 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3300 sb->s_flags &= ~MS_RDONLY;
3301 }
3302 }
0390131b
FM		 3303 if (sbi->s_journal == NULL)
3304 ext4_commit_super(sb, es, 1);
3305
ac27a0ec
DK		 3306#ifdef CONFIG_QUOTA
3307 /* Release old quota file names */
3308 for (i = 0; i < MAXQUOTAS; i++)
3309 if (old_opts.s_qf_names[i] &&
3310 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3311 kfree(old_opts.s_qf_names[i]);
3312#endif
3313 return 0;
3314restore_opts:
3315 sb->s_flags = old_sb_flags;
3316 sbi->s_mount_opt = old_opts.s_mount_opt;
3317 sbi->s_resuid = old_opts.s_resuid;
3318 sbi->s_resgid = old_opts.s_resgid;
3319 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3320 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3321 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3322#ifdef CONFIG_QUOTA
3323 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3324 for (i = 0; i < MAXQUOTAS; i++) {
3325 if (sbi->s_qf_names[i] &&
3326 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3327 kfree(sbi->s_qf_names[i]);
3328 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3329 }
3330#endif
3331 return err;
3332}
3333
2b2d6d01 3334static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3335{
3336 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3337 struct ext4_sb_info *sbi = EXT4_SB(sb);
3338 struct ext4_super_block *es = sbi->s_es;
960cc398 3339 u64 fsid;
ac27a0ec 3340
5e70030d
BP		 3341 if (test_opt(sb, MINIX_DF)) {
3342 sbi->s_overhead_last = 0;
6bc9feff 3343 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3344 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3345 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3346 smp_rmb();
3347
3348 /*
5e70030d
BP		 3349 * Compute the overhead (FS structures). This is constant
3350 * for a given filesystem unless the number of block groups
3351 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3352 */
3353
3354 /*
3355 * All of the blocks before first_data_block are
3356 * overhead
3357 */
3358 overhead = le32_to_cpu(es->s_first_data_block);
3359
3360 /*
3361 * Add the overhead attributed to the superblock and
3362 * block group descriptors. If the sparse superblocks
3363 * feature is turned on, then not all groups have this.
3364 */
3365 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3366 overhead += ext4_bg_has_super(sb, i) +
3367 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3368 cond_resched();
3369 }
3370
3371 /*
3372 * Every block group has an inode bitmap, a block
3373 * bitmap, and an inode table.
3374 */
5e70030d
BP		 3375 overhead += ngroups * (2 + sbi->s_itb_per_group);
3376 sbi->s_overhead_last = overhead;
3377 smp_wmb();
6bc9feff 3378 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3379 }
3380
617ba13b 3381 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3382 buf->f_bsize = sb->s_blocksize;
5e70030d 3383 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3384 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3385 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3386 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3387 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3388 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3389 buf->f_bavail = 0;
3390 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3391 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3392 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3393 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3394 fsid = le64_to_cpup((void *)es->s_uuid) ^
3395 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3396 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3397 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3398 return 0;
3399}
3400
3401/* Helper function for writing quotas on sync - we need to start transaction before quota file
3402 * is locked for write. Otherwise the are possible deadlocks:
3403 * Process 1 Process 2
617ba13b 3404 * ext4_create() quota_sync()
dab291af 3405 * jbd2_journal_start() write_dquot()
ac27a0ec 3406 * DQUOT_INIT() down(dqio_mutex)
dab291af 3407 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3408 *
3409 */
3410
3411#ifdef CONFIG_QUOTA
3412
3413static inline struct inode *dquot_to_inode(struct dquot *dquot)
3414{
3415 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3416}
3417
617ba13b 3418static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3419{
3420 handle_t *handle;
3421 int ret, err;
3422
3423 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3424 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3425 if (IS_ERR(handle))
3426 return PTR_ERR(handle);
3427 ret = dquot_initialize(inode, type);
617ba13b 3428 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3429 if (!ret)
3430 ret = err;
3431 return ret;
3432}
3433
617ba13b 3434static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3435{
3436 handle_t *handle;
3437 int ret, err;
3438
3439 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3440 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2887df13
JK		 3441 if (IS_ERR(handle)) {
3442 /*
3443 * We call dquot_drop() anyway to at least release references
3444 * to quota structures so that umount does not hang.
3445 */
3446 dquot_drop(inode);
ac27a0ec 3447 return PTR_ERR(handle);
2887df13 3448 }
ac27a0ec 3449 ret = dquot_drop(inode);
617ba13b 3450 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3451 if (!ret)
3452 ret = err;
3453 return ret;
3454}
3455
617ba13b 3456static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3457{
3458 int ret, err;
3459 handle_t *handle;
3460 struct inode *inode;
3461
3462 inode = dquot_to_inode(dquot);
617ba13b
MC		 3463 handle = ext4_journal_start(inode,
3464 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3465 if (IS_ERR(handle))
3466 return PTR_ERR(handle);
3467 ret = dquot_commit(dquot);
617ba13b 3468 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3469 if (!ret)
3470 ret = err;
3471 return ret;
3472}
3473
617ba13b 3474static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3475{
3476 int ret, err;
3477 handle_t *handle;
3478
617ba13b
MC		 3479 handle = ext4_journal_start(dquot_to_inode(dquot),
3480 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3481 if (IS_ERR(handle))
3482 return PTR_ERR(handle);
3483 ret = dquot_acquire(dquot);
617ba13b 3484 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3485 if (!ret)
3486 ret = err;
3487 return ret;
3488}
3489
617ba13b 3490static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3491{
3492 int ret, err;
3493 handle_t *handle;
3494
617ba13b
MC		 3495 handle = ext4_journal_start(dquot_to_inode(dquot),
3496 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3497 if (IS_ERR(handle)) {
3498 /* Release dquot anyway to avoid endless cycle in dqput() */
3499 dquot_release(dquot);
ac27a0ec 3500 return PTR_ERR(handle);
9c3013e9 3501 }
ac27a0ec 3502 ret = dquot_release(dquot);
617ba13b 3503 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3504 if (!ret)
3505 ret = err;
3506 return ret;
3507}
3508
617ba13b 3509static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3510{
2c8be6b2 3511 /* Are we journaling quotas? */
617ba13b
MC		 3512 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3513 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3514 dquot_mark_dquot_dirty(dquot);
617ba13b 3515 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3516 } else {
3517 return dquot_mark_dquot_dirty(dquot);
3518 }
3519}
3520
617ba13b 3521static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3522{
3523 int ret, err;
3524 handle_t *handle;
3525
3526 /* Data block + inode block */
617ba13b 3527 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3528 if (IS_ERR(handle))
3529 return PTR_ERR(handle);
3530 ret = dquot_commit_info(sb, type);
617ba13b 3531 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3532 if (!ret)
3533 ret = err;
3534 return ret;
3535}
3536
3537/*
3538 * Turn on quotas during mount time - we need to find
3539 * the quota file and such...
3540 */
617ba13b 3541static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3542{
617ba13b
MC		 3543 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3544 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3545}
3546
3547/*
3548 * Standard function to be called on quota_on
3549 */
617ba13b 3550static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3551 char *name, int remount)
ac27a0ec
DK		 3552{
3553 int err;
8264613d 3554 struct path path;
ac27a0ec
DK		 3555
3556 if (!test_opt(sb, QUOTA))
3557 return -EINVAL;
8264613d 3558 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3559 if (remount)
8264613d 3560 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3561
8264613d 3562 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3563 if (err)
3564 return err;
0623543b 3565
ac27a0ec 3566 /* Quotafile not on the same filesystem? */
8264613d
AV		 3567 if (path.mnt->mnt_sb != sb) {
3568 path_put(&path);
ac27a0ec
DK		 3569 return -EXDEV;
3570 }
0623543b
JK		 3571 /* Journaling quota? */
3572 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3573 /* Quotafile not in fs root? */
8264613d 3574 if (path.dentry->d_parent != sb->s_root)
0623543b
JK		 3575 printk(KERN_WARNING
3576 "EXT4-fs: Quota file not on filesystem root. "
3577 "Journaled quota will not work.\n");
2b2d6d01 3578 }
0623543b
JK		 3579
3580 /*
3581 * When we journal data on quota file, we have to flush journal to see
3582 * all updates to the file when we bypass pagecache...
3583 */
0390131b
FM		 3584 if (EXT4_SB(sb)->s_journal &&
3585 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3586 /*
3587 * We don't need to lock updates but journal_flush() could
3588 * otherwise be livelocked...
3589 */
3590 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3591 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3592 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3593 if (err) {
8264613d 3594 path_put(&path);
7ffe1ea8
HK		 3595 return err;
3596 }
0623543b
JK		 3597 }
3598
8264613d
AV		 3599 err = vfs_quota_on_path(sb, type, format_id, &path);
3600 path_put(&path);
77e69dac 3601 return err;
ac27a0ec
DK		 3602}
3603
3604/* Read data from quotafile - avoid pagecache and such because we cannot afford
3605 * acquiring the locks... As quota files are never truncated and quota code
3606 * itself serializes the operations (and noone else should touch the files)
3607 * we don't have to be afraid of races */
617ba13b 3608static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3609 size_t len, loff_t off)
3610{
3611 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3612 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3613 int err = 0;
3614 int offset = off & (sb->s_blocksize - 1);
3615 int tocopy;
3616 size_t toread;
3617 struct buffer_head *bh;
3618 loff_t i_size = i_size_read(inode);
3619
3620 if (off > i_size)
3621 return 0;
3622 if (off+len > i_size)
3623 len = i_size-off;
3624 toread = len;
3625 while (toread > 0) {
3626 tocopy = sb->s_blocksize - offset < toread ?
3627 sb->s_blocksize - offset : toread;
617ba13b 3628 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3629 if (err)
3630 return err;
3631 if (!bh) /* A hole? */
3632 memset(data, 0, tocopy);
3633 else
3634 memcpy(data, bh->b_data+offset, tocopy);
3635 brelse(bh);
3636 offset = 0;
3637 toread -= tocopy;
3638 data += tocopy;
3639 blk++;
3640 }
3641 return len;
3642}
3643
3644/* Write to quotafile (we know the transaction is already started and has
3645 * enough credits) */
617ba13b 3646static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3647 const char *data, size_t len, loff_t off)
3648{
3649 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3650 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3651 int err = 0;
3652 int offset = off & (sb->s_blocksize - 1);
3653 int tocopy;
617ba13b 3654 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3655 size_t towrite = len;
3656 struct buffer_head *bh;
3657 handle_t *handle = journal_current_handle();
3658
0390131b 3659 if (EXT4_SB(sb)->s_journal && !handle) {
e5f8eab8 3660 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3661 " cancelled because transaction is not started.\n",
3662 (unsigned long long)off, (unsigned long long)len);
3663 return -EIO;
3664 }
ac27a0ec
DK		 3665 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3666 while (towrite > 0) {
3667 tocopy = sb->s_blocksize - offset < towrite ?
3668 sb->s_blocksize - offset : towrite;
617ba13b 3669 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3670 if (!bh)
3671 goto out;
3672 if (journal_quota) {
617ba13b 3673 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3674 if (err) {
3675 brelse(bh);
3676 goto out;
3677 }
3678 }
3679 lock_buffer(bh);
3680 memcpy(bh->b_data+offset, data, tocopy);
3681 flush_dcache_page(bh->b_page);
3682 unlock_buffer(bh);
3683 if (journal_quota)
0390131b 3684 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3685 else {
3686 /* Always do at least ordered writes for quotas */
678aaf48 3687 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3688 mark_buffer_dirty(bh);
3689 }
3690 brelse(bh);
3691 if (err)
3692 goto out;
3693 offset = 0;
3694 towrite -= tocopy;
3695 data += tocopy;
3696 blk++;
3697 }
3698out:
4d04e4fb
JK		 3699 if (len == towrite) {
3700 mutex_unlock(&inode->i_mutex);
ac27a0ec 3701 return err;
4d04e4fb 3702 }
ac27a0ec
DK		 3703 if (inode->i_size < off+len-towrite) {
3704 i_size_write(inode, off+len-towrite);
617ba13b 3705 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3706 }
ac27a0ec 3707 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3708 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3709 mutex_unlock(&inode->i_mutex);
3710 return len - towrite;
3711}
3712
3713#endif
3714
617ba13b 3715static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3716 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3717{
617ba13b 3718 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3719}
3720
5e8814f2
TT		 3721#ifdef CONFIG_PROC_FS
3722static int ext4_ui_proc_show(struct seq_file *m, void *v)
3723{
3724 unsigned int *p = m->private;
3725
3726 seq_printf(m, "%u\n", *p);
3727 return 0;
3728}
3729
3730static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3731{
3732 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3733}
3734
3735static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3736 size_t cnt, loff_t *ppos)
3737{
23475e26 3738 unsigned long *p = PDE(file->f_path.dentry->d_inode)->data;
5e8814f2 3739 char str[32];
5e8814f2
TT		 3740
3741 if (cnt >= sizeof(str))
3742 return -EINVAL;
3743 if (copy_from_user(str, buf, cnt))
3744 return -EFAULT;
23475e26
RK		 3745
3746 *p = simple_strtoul(str, NULL, 0);
5e8814f2
TT		 3747 return cnt;
3748}
3749
3750const struct file_operations ext4_ui_proc_fops = {
3751 .owner = THIS_MODULE,
3752 .open = ext4_ui_proc_open,
3753 .read = seq_read,
3754 .llseek = seq_lseek,
3755 .release = single_release,
3756 .write = ext4_ui_proc_write,
3757};
3758#endif
3759
03010a33
TT		 3760static struct file_system_type ext4_fs_type = {
3761 .owner = THIS_MODULE,
3762 .name = "ext4",
3763 .get_sb = ext4_get_sb,
3764 .kill_sb = kill_block_super,
3765 .fs_flags = FS_REQUIRES_DEV,
3766};
3767
3768#ifdef CONFIG_EXT4DEV_COMPAT
3769static int ext4dev_get_sb(struct file_system_type *fs_type,
3770 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3771{
3772 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3773 "to mount using ext4\n");
3774 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3775 "will go away by 2.6.31\n");
3776 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3777}
3778
617ba13b 3779static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3780 .owner = THIS_MODULE,
617ba13b 3781 .name = "ext4dev",
03010a33 3782 .get_sb = ext4dev_get_sb,
ac27a0ec
DK		 3783 .kill_sb = kill_block_super,
3784 .fs_flags = FS_REQUIRES_DEV,
3785};
03010a33
TT		 3786MODULE_ALIAS("ext4dev");
3787#endif
ac27a0ec 3788
617ba13b 3789static int __init init_ext4_fs(void)
ac27a0ec 3790{
c9de560d
AT		 3791 int err;
3792
9f6200bb 3793 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 3794 err = init_ext4_mballoc();
ac27a0ec
DK		 3795 if (err)
3796 return err;
c9de560d
AT		 3797
3798 err = init_ext4_xattr();
3799 if (err)
3800 goto out2;
ac27a0ec
DK		 3801 err = init_inodecache();
3802 if (err)
3803 goto out1;
03010a33 3804 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 3805 if (err)
3806 goto out;
03010a33
TT		 3807#ifdef CONFIG_EXT4DEV_COMPAT
3808 err = register_filesystem(&ext4dev_fs_type);
3809 if (err) {
3810 unregister_filesystem(&ext4_fs_type);
3811 goto out;
3812 }
3813#endif
ac27a0ec
DK		 3814 return 0;
3815out:
3816 destroy_inodecache();
3817out1:
617ba13b 3818 exit_ext4_xattr();
c9de560d
AT		 3819out2:
3820 exit_ext4_mballoc();
ac27a0ec
DK		 3821 return err;
3822}
3823
617ba13b 3824static void __exit exit_ext4_fs(void)
ac27a0ec 3825{
03010a33
TT		 3826 unregister_filesystem(&ext4_fs_type);
3827#ifdef CONFIG_EXT4DEV_COMPAT
617ba13b 3828 unregister_filesystem(&ext4dev_fs_type);
03010a33 3829#endif
ac27a0ec 3830 destroy_inodecache();
617ba13b 3831 exit_ext4_xattr();
c9de560d 3832 exit_ext4_mballoc();
9f6200bb 3833 remove_proc_entry("fs/ext4", NULL);
ac27a0ec
DK		 3834}
3835
3836MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3837MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3838MODULE_LICENSE("GPL");
617ba13b
MC		 3839module_init(init_ext4_fs)
3840module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)