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ext4: fix #11321: create /proc/ext4/*/stats more carefully
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
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>
1330593e 37#include <linux/log2.h>
717d50e4 38#include <linux/crc16.h>
ac27a0ec
DK		 39#include <asm/uaccess.h>
40
3dcf5451
CH		 41#include "ext4.h"
42#include "ext4_jbd2.h"
ac27a0ec
DK		 43#include "xattr.h"
44#include "acl.h"
45#include "namei.h"
717d50e4 46#include "group.h"
ac27a0ec 47
617ba13b 48static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 49 unsigned long journal_devnum);
617ba13b 50static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 51 unsigned int);
2b2d6d01
TT		 52static void ext4_commit_super(struct super_block *sb,
53 struct ext4_super_block *es, int sync);
54static void ext4_mark_recovery_complete(struct super_block *sb,
55 struct ext4_super_block *es);
56static void ext4_clear_journal_err(struct super_block *sb,
57 struct ext4_super_block *es);
617ba13b 58static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 59static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 60 char nbuf[16]);
2b2d6d01
TT		 61static int ext4_remount(struct super_block *sb, int *flags, char *data);
62static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
617ba13b 63static void ext4_unlockfs(struct super_block *sb);
2b2d6d01 64static void ext4_write_super(struct super_block *sb);
617ba13b 65static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 66
bd81d8ee 67
8fadc143
AR		 68ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
69 struct ext4_group_desc *bg)
bd81d8ee 70{
3a14589c 71 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 72 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 73 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 74}
75
8fadc143
AR		 76ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
77 struct ext4_group_desc *bg)
bd81d8ee 78{
5272f837 79 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 80 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 81 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 82}
83
8fadc143
AR		 84ext4_fsblk_t ext4_inode_table(struct super_block *sb,
85 struct ext4_group_desc *bg)
bd81d8ee 86{
5272f837 87 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 88 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 89 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 90}
91
8fadc143
AR		 92void ext4_block_bitmap_set(struct super_block *sb,
93 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 94{
3a14589c 95 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 96 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
97 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 98}
99
8fadc143
AR		 100void ext4_inode_bitmap_set(struct super_block *sb,
101 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 102{
5272f837 103 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 104 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
105 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 106}
107
8fadc143
AR		 108void ext4_inode_table_set(struct super_block *sb,
109 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 110{
5272f837 111 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 112 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
113 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 114}
115
ac27a0ec 116/*
dab291af 117 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 118 *
119 * The only special thing we need to do here is to make sure that all
120 * journal_end calls result in the superblock being marked dirty, so
121 * that sync() will call the filesystem's write_super callback if
122 * appropriate.
123 */
617ba13b 124handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 125{
126 journal_t *journal;
127
128 if (sb->s_flags & MS_RDONLY)
129 return ERR_PTR(-EROFS);
130
131 /* Special case here: if the journal has aborted behind our
132 * backs (eg. EIO in the commit thread), then we still need to
133 * take the FS itself readonly cleanly. */
617ba13b 134 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 135 if (is_journal_aborted(journal)) {
46e665e9 136 ext4_abort(sb, __func__,
ac27a0ec
DK		 137 "Detected aborted journal");
138 return ERR_PTR(-EROFS);
139 }
140
dab291af 141 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 142}
143
144/*
145 * The only special thing we need to do here is to make sure that all
dab291af 146 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 147 * that sync() will call the filesystem's write_super callback if
148 * appropriate.
149 */
617ba13b 150int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 151{
152 struct super_block *sb;
153 int err;
154 int rc;
155
156 sb = handle->h_transaction->t_journal->j_private;
157 err = handle->h_err;
dab291af 158 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 159
160 if (!err)
161 err = rc;
162 if (err)
617ba13b 163 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 164 return err;
165}
166
617ba13b 167void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 168 struct buffer_head *bh, handle_t *handle, int err)
169{
170 char nbuf[16];
617ba13b 171 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec
DK		 172
173 if (bh)
174 BUFFER_TRACE(bh, "abort");
175
176 if (!handle->h_err)
177 handle->h_err = err;
178
179 if (is_handle_aborted(handle))
180 return;
181
182 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
183 caller, errstr, err_fn);
184
dab291af 185 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 186}
187
188/* Deal with the reporting of failure conditions on a filesystem such as
189 * inconsistencies detected or read IO failures.
190 *
191 * On ext2, we can store the error state of the filesystem in the
617ba13b 192 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 193 * write ordering constraints on the superblock which prevent us from
194 * writing it out straight away; and given that the journal is about to
195 * be aborted, we can't rely on the current, or future, transactions to
196 * write out the superblock safely.
197 *
dab291af 198 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 199 * the journal instead. On recovery, the journal will compain about
200 * that error until we've noted it down and cleared it.
201 */
202
617ba13b 203static void ext4_handle_error(struct super_block *sb)
ac27a0ec 204{
617ba13b 205 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 206
617ba13b
MC		 207 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
208 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 209
210 if (sb->s_flags & MS_RDONLY)
211 return;
212
2b2d6d01 213 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 214 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 215
617ba13b 216 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 217 if (journal)
dab291af 218 jbd2_journal_abort(journal, -EIO);
ac27a0ec 219 }
2b2d6d01
TT		 220 if (test_opt(sb, ERRORS_RO)) {
221 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 222 sb->s_flags |= MS_RDONLY;
223 }
617ba13b 224 ext4_commit_super(sb, es, 1);
ac27a0ec 225 if (test_opt(sb, ERRORS_PANIC))
617ba13b 226 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 227 sb->s_id);
228}
229
2b2d6d01
TT		 230void ext4_error(struct super_block *sb, const char *function,
231 const char *fmt, ...)
ac27a0ec
DK		 232{
233 va_list args;
234
235 va_start(args, fmt);
2b2d6d01 236 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 237 vprintk(fmt, args);
238 printk("\n");
239 va_end(args);
240
617ba13b 241 ext4_handle_error(sb);
ac27a0ec
DK		 242}
243
2b2d6d01 244static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 245 char nbuf[16])
246{
247 char *errstr = NULL;
248
249 switch (errno) {
250 case -EIO:
251 errstr = "IO failure";
252 break;
253 case -ENOMEM:
254 errstr = "Out of memory";
255 break;
256 case -EROFS:
dab291af 257 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 258 errstr = "Journal has aborted";
259 else
260 errstr = "Readonly filesystem";
261 break;
262 default:
263 /* If the caller passed in an extra buffer for unknown
264 * errors, textualise them now. Else we just return
265 * NULL. */
266 if (nbuf) {
267 /* Check for truncated error codes... */
268 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
269 errstr = nbuf;
270 }
271 break;
272 }
273
274 return errstr;
275}
276
617ba13b 277/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 278 * automatically and invokes the appropriate error response. */
279
2b2d6d01 280void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 281{
282 char nbuf[16];
283 const char *errstr;
284
285 /* Special case: if the error is EROFS, and we're not already
286 * inside a transaction, then there's really no point in logging
287 * an error. */
288 if (errno == -EROFS && journal_current_handle() == NULL &&
289 (sb->s_flags & MS_RDONLY))
290 return;
291
617ba13b 292 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 293 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
294 sb->s_id, function, errstr);
ac27a0ec 295
617ba13b 296 ext4_handle_error(sb);
ac27a0ec
DK		 297}
298
299/*
617ba13b 300 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 301 * abort function may be used to deal with unrecoverable failures such
302 * as journal IO errors or ENOMEM at a critical moment in log management.
303 *
304 * We unconditionally force the filesystem into an ABORT|READONLY state,
305 * unless the error response on the fs has been set to panic in which
306 * case we take the easy way out and panic immediately.
307 */
308
2b2d6d01
TT		 309void ext4_abort(struct super_block *sb, const char *function,
310 const char *fmt, ...)
ac27a0ec
DK		 311{
312 va_list args;
313
2b2d6d01 314 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 315
316 va_start(args, fmt);
2b2d6d01 317 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 318 vprintk(fmt, args);
319 printk("\n");
320 va_end(args);
321
322 if (test_opt(sb, ERRORS_PANIC))
617ba13b 323 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 324
325 if (sb->s_flags & MS_RDONLY)
326 return;
327
328 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 329 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 330 sb->s_flags |= MS_RDONLY;
617ba13b 331 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
dab291af 332 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 333}
334
2b2d6d01
TT		 335void ext4_warning(struct super_block *sb, const char *function,
336 const char *fmt, ...)
ac27a0ec
DK		 337{
338 va_list args;
339
340 va_start(args, fmt);
617ba13b 341 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 342 sb->s_id, function);
343 vprintk(fmt, args);
344 printk("\n");
345 va_end(args);
346}
347
617ba13b 348void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 349{
617ba13b 350 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 351
617ba13b 352 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 353 return;
354
46e665e9 355 ext4_warning(sb, __func__,
ac27a0ec
DK		 356 "updating to rev %d because of new feature flag, "
357 "running e2fsck is recommended",
617ba13b 358 EXT4_DYNAMIC_REV);
ac27a0ec 359
617ba13b
MC		 360 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
361 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
362 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 363 /* leave es->s_feature_*compat flags alone */
364 /* es->s_uuid will be set by e2fsck if empty */
365
366 /*
367 * The rest of the superblock fields should be zero, and if not it
368 * means they are likely already in use, so leave them alone. We
369 * can leave it up to e2fsck to clean up any inconsistencies there.
370 */
371}
372
99e6f829
AK		 373int ext4_update_compat_feature(handle_t *handle,
374 struct super_block *sb, __u32 compat)
375{
376 int err = 0;
377 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
378 err = ext4_journal_get_write_access(handle,
379 EXT4_SB(sb)->s_sbh);
380 if (err)
381 return err;
382 EXT4_SET_COMPAT_FEATURE(sb, compat);
383 sb->s_dirt = 1;
384 handle->h_sync = 1;
385 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
386 "call ext4_journal_dirty_met adata");
387 err = ext4_journal_dirty_metadata(handle,
388 EXT4_SB(sb)->s_sbh);
389 }
390 return err;
391}
392
393int ext4_update_rocompat_feature(handle_t *handle,
394 struct super_block *sb, __u32 rocompat)
395{
396 int err = 0;
397 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
398 err = ext4_journal_get_write_access(handle,
399 EXT4_SB(sb)->s_sbh);
400 if (err)
401 return err;
402 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
403 sb->s_dirt = 1;
404 handle->h_sync = 1;
405 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
406 "call ext4_journal_dirty_met adata");
407 err = ext4_journal_dirty_metadata(handle,
408 EXT4_SB(sb)->s_sbh);
409 }
410 return err;
411}
412
413int ext4_update_incompat_feature(handle_t *handle,
414 struct super_block *sb, __u32 incompat)
415{
416 int err = 0;
417 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
418 err = ext4_journal_get_write_access(handle,
419 EXT4_SB(sb)->s_sbh);
420 if (err)
421 return err;
422 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
423 sb->s_dirt = 1;
424 handle->h_sync = 1;
425 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
426 "call ext4_journal_dirty_met adata");
427 err = ext4_journal_dirty_metadata(handle,
428 EXT4_SB(sb)->s_sbh);
429 }
430 return err;
431}
432
ac27a0ec
DK		 433/*
434 * Open the external journal device
435 */
617ba13b 436static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 437{
438 struct block_device *bdev;
439 char b[BDEVNAME_SIZE];
440
441 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
442 if (IS_ERR(bdev))
443 goto fail;
444 return bdev;
445
446fail:
617ba13b 447 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 448 __bdevname(dev, b), PTR_ERR(bdev));
449 return NULL;
450}
451
452/*
453 * Release the journal device
454 */
617ba13b 455static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 456{
457 bd_release(bdev);
458 return blkdev_put(bdev);
459}
460
617ba13b 461static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 462{
463 struct block_device *bdev;
464 int ret = -ENODEV;
465
466 bdev = sbi->journal_bdev;
467 if (bdev) {
617ba13b 468 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 469 sbi->journal_bdev = NULL;
470 }
471 return ret;
472}
473
474static inline struct inode *orphan_list_entry(struct list_head *l)
475{
617ba13b 476 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 477}
478
617ba13b 479static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 480{
481 struct list_head *l;
482
483 printk(KERN_ERR "sb orphan head is %d\n",
484 le32_to_cpu(sbi->s_es->s_last_orphan));
485
486 printk(KERN_ERR "sb_info orphan list:\n");
487 list_for_each(l, &sbi->s_orphan) {
488 struct inode *inode = orphan_list_entry(l);
489 printk(KERN_ERR " "
490 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
491 inode->i_sb->s_id, inode->i_ino, inode,
492 inode->i_mode, inode->i_nlink,
493 NEXT_ORPHAN(inode));
494 }
495}
496
2b2d6d01 497static void ext4_put_super(struct super_block *sb)
ac27a0ec 498{
617ba13b
MC		 499 struct ext4_sb_info *sbi = EXT4_SB(sb);
500 struct ext4_super_block *es = sbi->s_es;
ac27a0ec
DK		 501 int i;
502
c9de560d 503 ext4_mb_release(sb);
a86c6181 504 ext4_ext_release(sb);
617ba13b 505 ext4_xattr_put_super(sb);
dab291af 506 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 507 sbi->s_journal = NULL;
ac27a0ec 508 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 509 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK		 510 es->s_state = cpu_to_le16(sbi->s_mount_state);
511 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
512 mark_buffer_dirty(sbi->s_sbh);
617ba13b 513 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 514 }
515
516 for (i = 0; i < sbi->s_gdb_count; i++)
517 brelse(sbi->s_group_desc[i]);
518 kfree(sbi->s_group_desc);
772cb7c8 519 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 520 percpu_counter_destroy(&sbi->s_freeblocks_counter);
521 percpu_counter_destroy(&sbi->s_freeinodes_counter);
522 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 523 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 524 brelse(sbi->s_sbh);
525#ifdef CONFIG_QUOTA
526 for (i = 0; i < MAXQUOTAS; i++)
527 kfree(sbi->s_qf_names[i]);
528#endif
529
530 /* Debugging code just in case the in-memory inode orphan list
531 * isn't empty. The on-disk one can be non-empty if we've
532 * detected an error and taken the fs readonly, but the
533 * in-memory list had better be clean by this point. */
534 if (!list_empty(&sbi->s_orphan))
535 dump_orphan_list(sb, sbi);
536 J_ASSERT(list_empty(&sbi->s_orphan));
537
f98393a6 538 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 539 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
540 /*
541 * Invalidate the journal device's buffers. We don't want them
542 * floating about in memory - the physical journal device may
543 * hotswapped, and it breaks the `ro-after' testing code.
544 */
545 sync_blockdev(sbi->journal_bdev);
f98393a6 546 invalidate_bdev(sbi->journal_bdev);
617ba13b 547 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 548 }
549 sb->s_fs_info = NULL;
550 kfree(sbi);
551 return;
552}
553
e18b890b 554static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 555
556/*
557 * Called inside transaction, so use GFP_NOFS
558 */
617ba13b 559static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 560{
617ba13b 561 struct ext4_inode_info *ei;
ac27a0ec 562
e6b4f8da 563 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 564 if (!ei)
565 return NULL;
617ba13b
MC		 566#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
567 ei->i_acl = EXT4_ACL_NOT_CACHED;
568 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 569#endif
570 ei->i_block_alloc_info = NULL;
571 ei->vfs_inode.i_version = 1;
91246c00 572 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 573 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 574 INIT_LIST_HEAD(&ei->i_prealloc_list);
575 spin_lock_init(&ei->i_prealloc_lock);
678aaf48 576 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 577 ei->i_reserved_data_blocks = 0;
578 ei->i_reserved_meta_blocks = 0;
579 ei->i_allocated_meta_blocks = 0;
580 ei->i_delalloc_reserved_flag = 0;
581 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 582 return &ei->vfs_inode;
583}
584
617ba13b 585static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 586{
9f7dd93d
VA		 587 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
588 printk("EXT4 Inode %p: orphan list check failed!\n",
589 EXT4_I(inode));
590 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
591 EXT4_I(inode), sizeof(struct ext4_inode_info),
592 true);
593 dump_stack();
594 }
617ba13b 595 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 596}
597
51cc5068 598static void init_once(void *foo)
ac27a0ec 599{
617ba13b 600 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 601
a35afb83 602 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 603#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 604 init_rwsem(&ei->xattr_sem);
ac27a0ec 605#endif
0e855ac8 606 init_rwsem(&ei->i_data_sem);
a35afb83 607 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 608}
609
610static int init_inodecache(void)
611{
617ba13b
MC		 612 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
613 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 614 0, (SLAB_RECLAIM_ACCOUNT|
615 SLAB_MEM_SPREAD),
20c2df83 616 init_once);
617ba13b 617 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 618 return -ENOMEM;
619 return 0;
620}
621
622static void destroy_inodecache(void)
623{
617ba13b 624 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 625}
626
617ba13b 627static void ext4_clear_inode(struct inode *inode)
ac27a0ec 628{
617ba13b
MC		 629 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
630#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
631 if (EXT4_I(inode)->i_acl &&
632 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
633 posix_acl_release(EXT4_I(inode)->i_acl);
634 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
635 }
636 if (EXT4_I(inode)->i_default_acl &&
637 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
638 posix_acl_release(EXT4_I(inode)->i_default_acl);
639 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 640 }
641#endif
617ba13b
MC		 642 ext4_discard_reservation(inode);
643 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK		 644 if (unlikely(rsv))
645 kfree(rsv);
678aaf48
JK		 646 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
647 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 648}
649
2b2d6d01
TT		 650static inline void ext4_show_quota_options(struct seq_file *seq,
651 struct super_block *sb)
ac27a0ec
DK		 652{
653#if defined(CONFIG_QUOTA)
617ba13b 654 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 655
656 if (sbi->s_jquota_fmt)
657 seq_printf(seq, ",jqfmt=%s",
af5bc92d 658 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 659
660 if (sbi->s_qf_names[USRQUOTA])
661 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
662
663 if (sbi->s_qf_names[GRPQUOTA])
664 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
665
617ba13b 666 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 667 seq_puts(seq, ",usrquota");
668
617ba13b 669 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 670 seq_puts(seq, ",grpquota");
671#endif
672}
673
d9c9bef1
MS		 674/*
675 * Show an option if
676 * - it's set to a non-default value OR
677 * - if the per-sb default is different from the global default
678 */
617ba13b 679static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 680{
aa22df2c
AK		 681 int def_errors;
682 unsigned long def_mount_opts;
ac27a0ec 683 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 684 struct ext4_sb_info *sbi = EXT4_SB(sb);
685 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 686
687 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 688 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 689
690 if (sbi->s_sb_block != 1)
691 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
692 if (test_opt(sb, MINIX_DF))
693 seq_puts(seq, ",minixdf");
aa22df2c 694 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 695 seq_puts(seq, ",grpid");
696 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
697 seq_puts(seq, ",nogrpid");
698 if (sbi->s_resuid != EXT4_DEF_RESUID ||
699 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
700 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
701 }
702 if (sbi->s_resgid != EXT4_DEF_RESGID ||
703 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
704 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
705 }
bb4f397a 706 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 707 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 708 def_errors == EXT4_ERRORS_CONTINUE) {
709 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 710 }
711 }
aa22df2c 712 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 713 seq_puts(seq, ",errors=continue");
aa22df2c 714 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 715 seq_puts(seq, ",errors=panic");
aa22df2c 716 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 717 seq_puts(seq, ",nouid32");
aa22df2c 718 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 719 seq_puts(seq, ",debug");
720 if (test_opt(sb, OLDALLOC))
721 seq_puts(seq, ",oldalloc");
07620f69 722#ifdef CONFIG_EXT4DEV_FS_XATTR
aa22df2c
AK		 723 if (test_opt(sb, XATTR_USER) &&
724 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 725 seq_puts(seq, ",user_xattr");
726 if (!test_opt(sb, XATTR_USER) &&
727 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
728 seq_puts(seq, ",nouser_xattr");
729 }
730#endif
07620f69 731#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
aa22df2c 732 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 733 seq_puts(seq, ",acl");
734 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
735 seq_puts(seq, ",noacl");
736#endif
737 if (!test_opt(sb, RESERVATION))
738 seq_puts(seq, ",noreservation");
739 if (sbi->s_commit_interval) {
740 seq_printf(seq, ",commit=%u",
741 (unsigned) (sbi->s_commit_interval / HZ));
742 }
571640ca
ES		 743 /*
744 * We're changing the default of barrier mount option, so
745 * let's always display its mount state so it's clear what its
746 * status is.
747 */
748 seq_puts(seq, ",barrier=");
749 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 750 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
751 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 752 if (test_opt(sb, NOBH))
753 seq_puts(seq, ",nobh");
754 if (!test_opt(sb, EXTENTS))
755 seq_puts(seq, ",noextents");
3dbd0ede
AK		 756 if (!test_opt(sb, MBALLOC))
757 seq_puts(seq, ",nomballoc");
25ec56b5
JNC		 758 if (test_opt(sb, I_VERSION))
759 seq_puts(seq, ",i_version");
dd919b98
AK		 760 if (!test_opt(sb, DELALLOC))
761 seq_puts(seq, ",nodelalloc");
762
ac27a0ec 763
cb45bbe4
MS		 764 if (sbi->s_stripe)
765 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 766 /*
767 * journal mode get enabled in different ways
768 * So just print the value even if we didn't specify it
769 */
617ba13b 770 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 771 seq_puts(seq, ",data=journal");
617ba13b 772 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 773 seq_puts(seq, ",data=ordered");
617ba13b 774 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 775 seq_puts(seq, ",data=writeback");
776
617ba13b 777 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 778 return 0;
779}
780
781
1b961ac0
CH		 782static struct inode *ext4_nfs_get_inode(struct super_block *sb,
783 u64 ino, u32 generation)
ac27a0ec 784{
ac27a0ec 785 struct inode *inode;
ac27a0ec 786
617ba13b 787 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 788 return ERR_PTR(-ESTALE);
617ba13b 789 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 790 return ERR_PTR(-ESTALE);
791
792 /* iget isn't really right if the inode is currently unallocated!!
793 *
617ba13b 794 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 795 * deleted, so we should be safe.
796 *
797 * Currently we don't know the generation for parent directory, so
798 * a generation of 0 means "accept any"
799 */
1d1fe1ee
DH		 800 inode = ext4_iget(sb, ino);
801 if (IS_ERR(inode))
802 return ERR_CAST(inode);
803 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 804 iput(inode);
805 return ERR_PTR(-ESTALE);
806 }
1b961ac0
CH		 807
808 return inode;
809}
810
811static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
812 int fh_len, int fh_type)
813{
814 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
815 ext4_nfs_get_inode);
816}
817
818static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
819 int fh_len, int fh_type)
820{
821 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
822 ext4_nfs_get_inode);
ac27a0ec
DK		 823}
824
825#ifdef CONFIG_QUOTA
af5bc92d 826#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 827#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 828
617ba13b
MC		 829static int ext4_dquot_initialize(struct inode *inode, int type);
830static int ext4_dquot_drop(struct inode *inode);
831static int ext4_write_dquot(struct dquot *dquot);
832static int ext4_acquire_dquot(struct dquot *dquot);
833static int ext4_release_dquot(struct dquot *dquot);
834static int ext4_mark_dquot_dirty(struct dquot *dquot);
835static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 836static int ext4_quota_on(struct super_block *sb, int type, int format_id,
837 char *path, int remount);
617ba13b
MC		 838static int ext4_quota_on_mount(struct super_block *sb, int type);
839static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 840 size_t len, loff_t off);
617ba13b 841static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 842 const char *data, size_t len, loff_t off);
843
617ba13b
MC		 844static struct dquot_operations ext4_quota_operations = {
845 .initialize = ext4_dquot_initialize,
846 .drop = ext4_dquot_drop,
ac27a0ec
DK		 847 .alloc_space = dquot_alloc_space,
848 .alloc_inode = dquot_alloc_inode,
849 .free_space = dquot_free_space,
850 .free_inode = dquot_free_inode,
851 .transfer = dquot_transfer,
617ba13b
MC		 852 .write_dquot = ext4_write_dquot,
853 .acquire_dquot = ext4_acquire_dquot,
854 .release_dquot = ext4_release_dquot,
855 .mark_dirty = ext4_mark_dquot_dirty,
856 .write_info = ext4_write_info
ac27a0ec
DK		 857};
858
617ba13b
MC		 859static struct quotactl_ops ext4_qctl_operations = {
860 .quota_on = ext4_quota_on,
ac27a0ec
DK		 861 .quota_off = vfs_quota_off,
862 .quota_sync = vfs_quota_sync,
863 .get_info = vfs_get_dqinfo,
864 .set_info = vfs_set_dqinfo,
865 .get_dqblk = vfs_get_dqblk,
866 .set_dqblk = vfs_set_dqblk
867};
868#endif
869
ee9b6d61 870static const struct super_operations ext4_sops = {
617ba13b
MC		 871 .alloc_inode = ext4_alloc_inode,
872 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 873 .write_inode = ext4_write_inode,
874 .dirty_inode = ext4_dirty_inode,
875 .delete_inode = ext4_delete_inode,
876 .put_super = ext4_put_super,
877 .write_super = ext4_write_super,
878 .sync_fs = ext4_sync_fs,
879 .write_super_lockfs = ext4_write_super_lockfs,
880 .unlockfs = ext4_unlockfs,
881 .statfs = ext4_statfs,
882 .remount_fs = ext4_remount,
883 .clear_inode = ext4_clear_inode,
884 .show_options = ext4_show_options,
ac27a0ec 885#ifdef CONFIG_QUOTA
617ba13b
MC		 886 .quota_read = ext4_quota_read,
887 .quota_write = ext4_quota_write,
ac27a0ec
DK		 888#endif
889};
890
39655164 891static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 892 .fh_to_dentry = ext4_fh_to_dentry,
893 .fh_to_parent = ext4_fh_to_parent,
617ba13b 894 .get_parent = ext4_get_parent,
ac27a0ec
DK		 895};
896
897enum {
898 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
899 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
900 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
901 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
902 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
903 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 904 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK		 905 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
906 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
907 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
908 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 909 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
dd919b98 910 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
ac27a0ec
DK		 911};
912
913static match_table_t tokens = {
914 {Opt_bsd_df, "bsddf"},
915 {Opt_minix_df, "minixdf"},
916 {Opt_grpid, "grpid"},
917 {Opt_grpid, "bsdgroups"},
918 {Opt_nogrpid, "nogrpid"},
919 {Opt_nogrpid, "sysvgroups"},
920 {Opt_resgid, "resgid=%u"},
921 {Opt_resuid, "resuid=%u"},
922 {Opt_sb, "sb=%u"},
923 {Opt_err_cont, "errors=continue"},
924 {Opt_err_panic, "errors=panic"},
925 {Opt_err_ro, "errors=remount-ro"},
926 {Opt_nouid32, "nouid32"},
927 {Opt_nocheck, "nocheck"},
928 {Opt_nocheck, "check=none"},
929 {Opt_debug, "debug"},
930 {Opt_oldalloc, "oldalloc"},
931 {Opt_orlov, "orlov"},
932 {Opt_user_xattr, "user_xattr"},
933 {Opt_nouser_xattr, "nouser_xattr"},
934 {Opt_acl, "acl"},
935 {Opt_noacl, "noacl"},
936 {Opt_reservation, "reservation"},
937 {Opt_noreservation, "noreservation"},
938 {Opt_noload, "noload"},
939 {Opt_nobh, "nobh"},
940 {Opt_bh, "bh"},
941 {Opt_commit, "commit=%u"},
942 {Opt_journal_update, "journal=update"},
943 {Opt_journal_inum, "journal=%u"},
944 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 945 {Opt_journal_checksum, "journal_checksum"},
946 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 947 {Opt_abort, "abort"},
948 {Opt_data_journal, "data=journal"},
949 {Opt_data_ordered, "data=ordered"},
950 {Opt_data_writeback, "data=writeback"},
951 {Opt_offusrjquota, "usrjquota="},
952 {Opt_usrjquota, "usrjquota=%s"},
953 {Opt_offgrpjquota, "grpjquota="},
954 {Opt_grpjquota, "grpjquota=%s"},
955 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
956 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
957 {Opt_grpquota, "grpquota"},
958 {Opt_noquota, "noquota"},
959 {Opt_quota, "quota"},
960 {Opt_usrquota, "usrquota"},
961 {Opt_barrier, "barrier=%u"},
a86c6181 962 {Opt_extents, "extents"},
1e2462f9 963 {Opt_noextents, "noextents"},
25ec56b5 964 {Opt_i_version, "i_version"},
c9de560d
AT		 965 {Opt_mballoc, "mballoc"},
966 {Opt_nomballoc, "nomballoc"},
967 {Opt_stripe, "stripe=%u"},
ac27a0ec 968 {Opt_resize, "resize"},
64769240 969 {Opt_delalloc, "delalloc"},
dd919b98 970 {Opt_nodelalloc, "nodelalloc"},
f3f12faa 971 {Opt_err, NULL},
ac27a0ec
DK		 972};
973
617ba13b 974static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 975{
617ba13b 976 ext4_fsblk_t sb_block;
ac27a0ec
DK		 977 char *options = (char *) *data;
978
979 if (!options || strncmp(options, "sb=", 3) != 0)
980 return 1; /* Default location */
981 options += 3;
617ba13b 982 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 983 sb_block = simple_strtoul(options, &options, 0);
984 if (*options && *options != ',') {
4776004f 985 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 986 (char *) *data);
987 return 1;
988 }
989 if (*options == ',')
990 options++;
991 *data = (void *) options;
992 return sb_block;
993}
994
2b2d6d01
TT		 995static int parse_options(char *options, struct super_block *sb,
996 unsigned int *inum, unsigned long *journal_devnum,
997 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 998{
617ba13b 999 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1000 char *p;
ac27a0ec
DK		 1001 substring_t args[MAX_OPT_ARGS];
1002 int data_opt = 0;
1003 int option;
1004#ifdef CONFIG_QUOTA
dfc5d03f 1005 int qtype, qfmt;
ac27a0ec
DK		 1006 char *qname;
1007#endif
c07651b5 1008 ext4_fsblk_t last_block;
ac27a0ec
DK		 1009
1010 if (!options)
1011 return 1;
1012
2b2d6d01 1013 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1014 int token;
1015 if (!*p)
1016 continue;
1017
1018 token = match_token(p, tokens, args);
1019 switch (token) {
1020 case Opt_bsd_df:
2b2d6d01 1021 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1022 break;
1023 case Opt_minix_df:
2b2d6d01 1024 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1025 break;
1026 case Opt_grpid:
2b2d6d01 1027 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1028 break;
1029 case Opt_nogrpid:
2b2d6d01 1030 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1031 break;
1032 case Opt_resuid:
1033 if (match_int(&args[0], &option))
1034 return 0;
1035 sbi->s_resuid = option;
1036 break;
1037 case Opt_resgid:
1038 if (match_int(&args[0], &option))
1039 return 0;
1040 sbi->s_resgid = option;
1041 break;
1042 case Opt_sb:
1043 /* handled by get_sb_block() instead of here */
1044 /* *sb_block = match_int(&args[0]); */
1045 break;
1046 case Opt_err_panic:
2b2d6d01
TT		 1047 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1048 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1049 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1050 break;
1051 case Opt_err_ro:
2b2d6d01
TT		 1052 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1053 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1054 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1055 break;
1056 case Opt_err_cont:
2b2d6d01
TT		 1057 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1058 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1059 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1060 break;
1061 case Opt_nouid32:
2b2d6d01 1062 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec
DK		 1063 break;
1064 case Opt_nocheck:
2b2d6d01 1065 clear_opt(sbi->s_mount_opt, CHECK);
ac27a0ec
DK		 1066 break;
1067 case Opt_debug:
2b2d6d01 1068 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1069 break;
1070 case Opt_oldalloc:
2b2d6d01 1071 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1072 break;
1073 case Opt_orlov:
2b2d6d01 1074 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1075 break;
617ba13b 1076#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec 1077 case Opt_user_xattr:
2b2d6d01 1078 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1079 break;
1080 case Opt_nouser_xattr:
2b2d6d01 1081 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1082 break;
1083#else
1084 case Opt_user_xattr:
1085 case Opt_nouser_xattr:
4776004f
TT		 1086 printk(KERN_ERR "EXT4 (no)user_xattr options "
1087 "not supported\n");
ac27a0ec
DK		 1088 break;
1089#endif
617ba13b 1090#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 1091 case Opt_acl:
1092 set_opt(sbi->s_mount_opt, POSIX_ACL);
1093 break;
1094 case Opt_noacl:
1095 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1096 break;
1097#else
1098 case Opt_acl:
1099 case Opt_noacl:
4776004f
TT		 1100 printk(KERN_ERR "EXT4 (no)acl options "
1101 "not supported\n");
ac27a0ec
DK		 1102 break;
1103#endif
1104 case Opt_reservation:
1105 set_opt(sbi->s_mount_opt, RESERVATION);
1106 break;
1107 case Opt_noreservation:
1108 clear_opt(sbi->s_mount_opt, RESERVATION);
1109 break;
1110 case Opt_journal_update:
1111 /* @@@ FIXME */
1112 /* Eventually we will want to be able to create
1113 a journal file here. For now, only allow the
1114 user to specify an existing inode to be the
1115 journal file. */
1116 if (is_remount) {
617ba13b 1117 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1118 "journal on remount\n");
1119 return 0;
1120 }
2b2d6d01 1121 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec
DK		 1122 break;
1123 case Opt_journal_inum:
1124 if (is_remount) {
617ba13b 1125 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1126 "journal on remount\n");
1127 return 0;
1128 }
1129 if (match_int(&args[0], &option))
1130 return 0;
1131 *inum = option;
1132 break;
1133 case Opt_journal_dev:
1134 if (is_remount) {
617ba13b 1135 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1136 "journal on remount\n");
1137 return 0;
1138 }
1139 if (match_int(&args[0], &option))
1140 return 0;
1141 *journal_devnum = option;
1142 break;
818d276c
GS		 1143 case Opt_journal_checksum:
1144 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1145 break;
1146 case Opt_journal_async_commit:
1147 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1148 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1149 break;
ac27a0ec 1150 case Opt_noload:
2b2d6d01 1151 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1152 break;
1153 case Opt_commit:
1154 if (match_int(&args[0], &option))
1155 return 0;
1156 if (option < 0)
1157 return 0;
1158 if (option == 0)
cd02ff0b 1159 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1160 sbi->s_commit_interval = HZ * option;
1161 break;
1162 case Opt_data_journal:
617ba13b 1163 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1164 goto datacheck;
1165 case Opt_data_ordered:
617ba13b 1166 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1167 goto datacheck;
1168 case Opt_data_writeback:
617ba13b 1169 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1170 datacheck:
1171 if (is_remount) {
617ba13b 1172 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1173 != data_opt) {
1174 printk(KERN_ERR
617ba13b 1175 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1176 "mode on remount\n");
1177 return 0;
1178 }
1179 } else {
617ba13b 1180 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1181 sbi->s_mount_opt |= data_opt;
1182 }
1183 break;
1184#ifdef CONFIG_QUOTA
1185 case Opt_usrjquota:
1186 qtype = USRQUOTA;
1187 goto set_qf_name;
1188 case Opt_grpjquota:
1189 qtype = GRPQUOTA;
1190set_qf_name:
dfc5d03f
JK		 1191 if ((sb_any_quota_enabled(sb) ||
1192 sb_any_quota_suspended(sb)) &&
1193 !sbi->s_qf_names[qtype]) {
ac27a0ec 1194 printk(KERN_ERR
4776004f
TT		 1195 "EXT4-fs: Cannot change journaled "
1196 "quota options when quota turned on.\n");
ac27a0ec
DK		 1197 return 0;
1198 }
1199 qname = match_strdup(&args[0]);
1200 if (!qname) {
1201 printk(KERN_ERR
617ba13b 1202 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1203 "storing quotafile name.\n");
1204 return 0;
1205 }
1206 if (sbi->s_qf_names[qtype] &&
1207 strcmp(sbi->s_qf_names[qtype], qname)) {
1208 printk(KERN_ERR
617ba13b 1209 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1210 "specified.\n", QTYPE2NAME(qtype));
1211 kfree(qname);
1212 return 0;
1213 }
1214 sbi->s_qf_names[qtype] = qname;
1215 if (strchr(sbi->s_qf_names[qtype], '/')) {
1216 printk(KERN_ERR
617ba13b 1217 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1218 "filesystem root.\n");
1219 kfree(sbi->s_qf_names[qtype]);
1220 sbi->s_qf_names[qtype] = NULL;
1221 return 0;
1222 }
1223 set_opt(sbi->s_mount_opt, QUOTA);
1224 break;
1225 case Opt_offusrjquota:
1226 qtype = USRQUOTA;
1227 goto clear_qf_name;
1228 case Opt_offgrpjquota:
1229 qtype = GRPQUOTA;
1230clear_qf_name:
dfc5d03f
JK		 1231 if ((sb_any_quota_enabled(sb) ||
1232 sb_any_quota_suspended(sb)) &&
1233 sbi->s_qf_names[qtype]) {
617ba13b 1234 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1235 "journaled quota options when "
ac27a0ec
DK		 1236 "quota turned on.\n");
1237 return 0;
1238 }
1239 /*
1240 * The space will be released later when all options
1241 * are confirmed to be correct
1242 */
1243 sbi->s_qf_names[qtype] = NULL;
1244 break;
1245 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1246 qfmt = QFMT_VFS_OLD;
1247 goto set_qf_format;
ac27a0ec 1248 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1249 qfmt = QFMT_VFS_V0;
1250set_qf_format:
1251 if ((sb_any_quota_enabled(sb) ||
1252 sb_any_quota_suspended(sb)) &&
1253 sbi->s_jquota_fmt != qfmt) {
1254 printk(KERN_ERR "EXT4-fs: Cannot change "
1255 "journaled quota options when "
1256 "quota turned on.\n");
1257 return 0;
1258 }
1259 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1260 break;
1261 case Opt_quota:
1262 case Opt_usrquota:
1263 set_opt(sbi->s_mount_opt, QUOTA);
1264 set_opt(sbi->s_mount_opt, USRQUOTA);
1265 break;
1266 case Opt_grpquota:
1267 set_opt(sbi->s_mount_opt, QUOTA);
1268 set_opt(sbi->s_mount_opt, GRPQUOTA);
1269 break;
1270 case Opt_noquota:
1271 if (sb_any_quota_enabled(sb)) {
617ba13b 1272 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1273 "options when quota turned on.\n");
1274 return 0;
1275 }
1276 clear_opt(sbi->s_mount_opt, QUOTA);
1277 clear_opt(sbi->s_mount_opt, USRQUOTA);
1278 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1279 break;
1280#else
1281 case Opt_quota:
1282 case Opt_usrquota:
1283 case Opt_grpquota:
cd59e7b9
JK		 1284 printk(KERN_ERR
1285 "EXT4-fs: quota options not supported.\n");
1286 break;
ac27a0ec
DK		 1287 case Opt_usrjquota:
1288 case Opt_grpjquota:
1289 case Opt_offusrjquota:
1290 case Opt_offgrpjquota:
1291 case Opt_jqfmt_vfsold:
1292 case Opt_jqfmt_vfsv0:
1293 printk(KERN_ERR
cd59e7b9 1294 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1295 "supported.\n");
1296 break;
1297 case Opt_noquota:
1298 break;
1299#endif
1300 case Opt_abort:
1301 set_opt(sbi->s_mount_opt, ABORT);
1302 break;
1303 case Opt_barrier:
1304 if (match_int(&args[0], &option))
1305 return 0;
1306 if (option)
1307 set_opt(sbi->s_mount_opt, BARRIER);
1308 else
1309 clear_opt(sbi->s_mount_opt, BARRIER);
1310 break;
1311 case Opt_ignore:
1312 break;
1313 case Opt_resize:
1314 if (!is_remount) {
617ba13b 1315 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1316 "for remount\n");
1317 return 0;
1318 }
1319 if (match_int(&args[0], &option) != 0)
1320 return 0;
1321 *n_blocks_count = option;
1322 break;
1323 case Opt_nobh:
1324 set_opt(sbi->s_mount_opt, NOBH);
1325 break;
1326 case Opt_bh:
1327 clear_opt(sbi->s_mount_opt, NOBH);
1328 break;
a86c6181 1329 case Opt_extents:
e4079a11
ES		 1330 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1331 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1332 ext4_warning(sb, __func__,
1333 "extents feature not enabled "
1334 "on this filesystem, use tune2fs\n");
1335 return 0;
1336 }
2b2d6d01 1337 set_opt(sbi->s_mount_opt, EXTENTS);
a86c6181 1338 break;
1e2462f9 1339 case Opt_noextents:
c07651b5
AK		 1340 /*
1341 * When e2fsprogs support resizing an already existing
1342 * ext3 file system to greater than 2**32 we need to
1343 * add support to block allocator to handle growing
1344 * already existing block mapped inode so that blocks
1345 * allocated for them fall within 2**32
1346 */
1347 last_block = ext4_blocks_count(sbi->s_es) - 1;
1348 if (last_block > 0xffffffffULL) {
1349 printk(KERN_ERR "EXT4-fs: Filesystem too "
1350 "large to mount with "
1351 "-o noextents options\n");
1352 return 0;
1353 }
2b2d6d01 1354 clear_opt(sbi->s_mount_opt, EXTENTS);
1e2462f9 1355 break;
25ec56b5
JNC		 1356 case Opt_i_version:
1357 set_opt(sbi->s_mount_opt, I_VERSION);
1358 sb->s_flags |= MS_I_VERSION;
1359 break;
dd919b98
AK		 1360 case Opt_nodelalloc:
1361 clear_opt(sbi->s_mount_opt, DELALLOC);
1362 break;
c9de560d
AT		 1363 case Opt_mballoc:
1364 set_opt(sbi->s_mount_opt, MBALLOC);
1365 break;
1366 case Opt_nomballoc:
1367 clear_opt(sbi->s_mount_opt, MBALLOC);
1368 break;
1369 case Opt_stripe:
1370 if (match_int(&args[0], &option))
1371 return 0;
1372 if (option < 0)
1373 return 0;
1374 sbi->s_stripe = option;
1375 break;
64769240
AT		 1376 case Opt_delalloc:
1377 set_opt(sbi->s_mount_opt, DELALLOC);
1378 break;
ac27a0ec 1379 default:
2b2d6d01
TT		 1380 printk(KERN_ERR
1381 "EXT4-fs: Unrecognized mount option \"%s\" "
1382 "or missing value\n", p);
ac27a0ec
DK		 1383 return 0;
1384 }
1385 }
1386#ifdef CONFIG_QUOTA
1387 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1388 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1389 sbi->s_qf_names[USRQUOTA])
1390 clear_opt(sbi->s_mount_opt, USRQUOTA);
1391
617ba13b 1392 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1393 sbi->s_qf_names[GRPQUOTA])
1394 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1395
1396 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1397 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1398 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1399 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1400 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1401 "format mixing.\n");
1402 return 0;
1403 }
1404
1405 if (!sbi->s_jquota_fmt) {
2c8be6b2 1406 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1407 "not specified.\n");
1408 return 0;
1409 }
1410 } else {
1411 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1412 printk(KERN_ERR "EXT4-fs: journaled quota format "
1413 "specified with no journaling "
ac27a0ec
DK		 1414 "enabled.\n");
1415 return 0;
1416 }
1417 }
1418#endif
1419 return 1;
1420}
1421
617ba13b 1422static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1423 int read_only)
1424{
617ba13b 1425 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1426 int res = 0;
1427
617ba13b 1428 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1429 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1430 "forcing read-only mode\n");
ac27a0ec
DK		 1431 res = MS_RDONLY;
1432 }
1433 if (read_only)
1434 return res;
617ba13b 1435 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1436 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1437 "running e2fsck is recommended\n");
617ba13b 1438 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1439 printk(KERN_WARNING
1440 "EXT4-fs warning: mounting fs with errors, "
1441 "running e2fsck is recommended\n");
ac27a0ec
DK		 1442 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1443 le16_to_cpu(es->s_mnt_count) >=
1444 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1445 printk(KERN_WARNING
1446 "EXT4-fs warning: maximal mount count reached, "
1447 "running e2fsck is recommended\n");
ac27a0ec
DK		 1448 else if (le32_to_cpu(es->s_checkinterval) &&
1449 (le32_to_cpu(es->s_lastcheck) +
1450 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1451 printk(KERN_WARNING
1452 "EXT4-fs warning: checktime reached, "
1453 "running e2fsck is recommended\n");
ac27a0ec
DK		 1454#if 0
1455 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1456 * inconsistencies, to force a fsck at reboot. But for
1457 * a plain journaled filesystem we can keep it set as
1458 * valid forever! :)
1459 */
216c34b2 1460 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec
DK		 1461#endif
1462 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1463 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1464 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1465 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1466 ext4_update_dynamic_rev(sb);
1467 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1468
617ba13b 1469 ext4_commit_super(sb, es, 1);
ac27a0ec 1470 if (test_opt(sb, DEBUG))
617ba13b 1471 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1472 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1473 sb->s_blocksize,
1474 sbi->s_groups_count,
617ba13b
MC		 1475 EXT4_BLOCKS_PER_GROUP(sb),
1476 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1477 sbi->s_mount_opt);
1478
617ba13b 1479 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK		 1480 char b[BDEVNAME_SIZE];
1481
4776004f
TT		 1482 printk(KERN_INFO "EXT4 FS on %s, external journal on %s\n",
1483 sb->s_id, bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec 1484 } else {
4776004f
TT		 1485 printk(KERN_INFO "EXT4 FS on %s, internal journal\n",
1486 sb->s_id);
ac27a0ec
DK		 1487 }
1488 return res;
1489}
1490
772cb7c8
JS		 1491static int ext4_fill_flex_info(struct super_block *sb)
1492{
1493 struct ext4_sb_info *sbi = EXT4_SB(sb);
1494 struct ext4_group_desc *gdp = NULL;
1495 struct buffer_head *bh;
1496 ext4_group_t flex_group_count;
1497 ext4_group_t flex_group;
1498 int groups_per_flex = 0;
1499 __u64 block_bitmap = 0;
1500 int i;
1501
1502 if (!sbi->s_es->s_log_groups_per_flex) {
1503 sbi->s_log_groups_per_flex = 0;
1504 return 1;
1505 }
1506
1507 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1508 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1509
c62a11fd
FB		 1510 /* We allocate both existing and potentially added groups */
1511 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1512 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1513 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1514 groups_per_flex;
ec05e868 1515 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1516 sizeof(struct flex_groups), GFP_KERNEL);
1517 if (sbi->s_flex_groups == NULL) {
ec05e868
LZ		 1518 printk(KERN_ERR "EXT4-fs: not enough memory for "
1519 "%lu flex groups\n", flex_group_count);
772cb7c8
JS		 1520 goto failed;
1521 }
772cb7c8
JS		 1522
1523 gdp = ext4_get_group_desc(sb, 1, &bh);
1524 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1525
1526 for (i = 0; i < sbi->s_groups_count; i++) {
1527 gdp = ext4_get_group_desc(sb, i, &bh);
1528
1529 flex_group = ext4_flex_group(sbi, i);
1530 sbi->s_flex_groups[flex_group].free_inodes +=
1531 le16_to_cpu(gdp->bg_free_inodes_count);
1532 sbi->s_flex_groups[flex_group].free_blocks +=
1533 le16_to_cpu(gdp->bg_free_blocks_count);
1534 }
1535
1536 return 1;
1537failed:
1538 return 0;
1539}
1540
717d50e4
AD		 1541__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1542 struct ext4_group_desc *gdp)
1543{
1544 __u16 crc = 0;
1545
1546 if (sbi->s_es->s_feature_ro_compat &
1547 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1548 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1549 __le32 le_group = cpu_to_le32(block_group);
1550
1551 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1552 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1553 crc = crc16(crc, (__u8 *)gdp, offset);
1554 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1555 /* for checksum of struct ext4_group_desc do the rest...*/
1556 if ((sbi->s_es->s_feature_incompat &
1557 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1558 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1559 crc = crc16(crc, (__u8 *)gdp + offset,
1560 le16_to_cpu(sbi->s_es->s_desc_size) -
1561 offset);
1562 }
1563
1564 return cpu_to_le16(crc);
1565}
1566
1567int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1568 struct ext4_group_desc *gdp)
1569{
1570 if ((sbi->s_es->s_feature_ro_compat &
1571 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1572 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1573 return 0;
1574
1575 return 1;
1576}
1577
ac27a0ec 1578/* Called at mount-time, super-block is locked */
197cd65a 1579static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1580{
617ba13b
MC		 1581 struct ext4_sb_info *sbi = EXT4_SB(sb);
1582 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1583 ext4_fsblk_t last_block;
bd81d8ee
LV		 1584 ext4_fsblk_t block_bitmap;
1585 ext4_fsblk_t inode_bitmap;
1586 ext4_fsblk_t inode_table;
ce421581 1587 int flexbg_flag = 0;
fd2d4291 1588 ext4_group_t i;
ac27a0ec 1589
ce421581
JS		 1590 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1591 flexbg_flag = 1;
1592
af5bc92d 1593 ext4_debug("Checking group descriptors");
ac27a0ec 1594
197cd65a
AM		 1595 for (i = 0; i < sbi->s_groups_count; i++) {
1596 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1597
ce421581 1598 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1599 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1600 else
1601 last_block = first_block +
617ba13b 1602 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1603
8fadc143 1604 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1605 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0
JB		 1606 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1607 "Block bitmap for group %lu not in group "
1608 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1609 return 0;
1610 }
8fadc143 1611 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1612 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0
JB		 1613 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1614 "Inode bitmap for group %lu not in group "
1615 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1616 return 0;
1617 }
8fadc143 1618 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1619 if (inode_table < first_block ||
2b2d6d01 1620 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0
JB		 1621 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1622 "Inode table for group %lu not in group "
1623 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1624 return 0;
1625 }
b5f10eed 1626 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1627 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0
JB		 1628 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1629 "Checksum for group %lu failed (%u!=%u)\n",
1630 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1631 gdp)), le16_to_cpu(gdp->bg_checksum));
8a266467
TT		 1632 if (!(sb->s_flags & MS_RDONLY))
1633 return 0;
717d50e4 1634 }
b5f10eed 1635 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1636 if (!flexbg_flag)
1637 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1638 }
1639
bd81d8ee 1640 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1641 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1642 return 1;
1643}
1644
617ba13b 1645/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1646 * the superblock) which were deleted from all directories, but held open by
1647 * a process at the time of a crash. We walk the list and try to delete these
1648 * inodes at recovery time (only with a read-write filesystem).
1649 *
1650 * In order to keep the orphan inode chain consistent during traversal (in
1651 * case of crash during recovery), we link each inode into the superblock
1652 * orphan list_head and handle it the same way as an inode deletion during
1653 * normal operation (which journals the operations for us).
1654 *
1655 * We only do an iget() and an iput() on each inode, which is very safe if we
1656 * accidentally point at an in-use or already deleted inode. The worst that
1657 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1658 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1659 * e2fsck was run on this filesystem, and it must have already done the orphan
1660 * inode cleanup for us, so we can safely abort without any further action.
1661 */
2b2d6d01
TT		 1662static void ext4_orphan_cleanup(struct super_block *sb,
1663 struct ext4_super_block *es)
ac27a0ec
DK		 1664{
1665 unsigned int s_flags = sb->s_flags;
1666 int nr_orphans = 0, nr_truncates = 0;
1667#ifdef CONFIG_QUOTA
1668 int i;
1669#endif
1670 if (!es->s_last_orphan) {
1671 jbd_debug(4, "no orphan inodes to clean up\n");
1672 return;
1673 }
1674
a8f48a95
ES		 1675 if (bdev_read_only(sb->s_bdev)) {
1676 printk(KERN_ERR "EXT4-fs: write access "
1677 "unavailable, skipping orphan cleanup.\n");
1678 return;
1679 }
1680
617ba13b 1681 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1682 if (es->s_last_orphan)
1683 jbd_debug(1, "Errors on filesystem, "
1684 "clearing orphan list.\n");
1685 es->s_last_orphan = 0;
1686 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1687 return;
1688 }
1689
1690 if (s_flags & MS_RDONLY) {
617ba13b 1691 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1692 sb->s_id);
1693 sb->s_flags &= ~MS_RDONLY;
1694 }
1695#ifdef CONFIG_QUOTA
1696 /* Needed for iput() to work correctly and not trash data */
1697 sb->s_flags |= MS_ACTIVE;
1698 /* Turn on quotas so that they are updated correctly */
1699 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1700 if (EXT4_SB(sb)->s_qf_names[i]) {
1701 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1702 if (ret < 0)
1703 printk(KERN_ERR
2c8be6b2 1704 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1705 "quota: error %d\n", ret);
1706 }
1707 }
1708#endif
1709
1710 while (es->s_last_orphan) {
1711 struct inode *inode;
1712
97bd42b9
JB		 1713 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1714 if (IS_ERR(inode)) {
ac27a0ec
DK		 1715 es->s_last_orphan = 0;
1716 break;
1717 }
1718
617ba13b 1719 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1720 DQUOT_INIT(inode);
1721 if (inode->i_nlink) {
1722 printk(KERN_DEBUG
e5f8eab8 1723 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1724 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1725 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1726 inode->i_ino, inode->i_size);
617ba13b 1727 ext4_truncate(inode);
ac27a0ec
DK		 1728 nr_truncates++;
1729 } else {
1730 printk(KERN_DEBUG
1731 "%s: deleting unreferenced inode %lu\n",
46e665e9 1732 __func__, inode->i_ino);
ac27a0ec
DK		 1733 jbd_debug(2, "deleting unreferenced inode %lu\n",
1734 inode->i_ino);
1735 nr_orphans++;
1736 }
1737 iput(inode); /* The delete magic happens here! */
1738 }
1739
2b2d6d01 1740#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1741
1742 if (nr_orphans)
617ba13b 1743 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1744 sb->s_id, PLURAL(nr_orphans));
1745 if (nr_truncates)
617ba13b 1746 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1747 sb->s_id, PLURAL(nr_truncates));
1748#ifdef CONFIG_QUOTA
1749 /* Turn quotas off */
1750 for (i = 0; i < MAXQUOTAS; i++) {
1751 if (sb_dqopt(sb)->files[i])
6f28e087 1752 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1753 }
1754#endif
1755 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1756}
cd2291a4
ES		 1757/*
1758 * Maximal extent format file size.
1759 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1760 * extent format containers, within a sector_t, and within i_blocks
1761 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1762 * so that won't be a limiting factor.
1763 *
1764 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1765 */
1766static loff_t ext4_max_size(int blkbits)
1767{
1768 loff_t res;
1769 loff_t upper_limit = MAX_LFS_FILESIZE;
1770
1771 /* small i_blocks in vfs inode? */
1772 if (sizeof(blkcnt_t) < sizeof(u64)) {
1773 /*
1774 * CONFIG_LSF is not enabled implies the inode
1775 * i_block represent total blocks in 512 bytes
1776 * 32 == size of vfs inode i_blocks * 8
1777 */
1778 upper_limit = (1LL << 32) - 1;
1779
1780 /* total blocks in file system block size */
1781 upper_limit >>= (blkbits - 9);
1782 upper_limit <<= blkbits;
1783 }
1784
1785 /* 32-bit extent-start container, ee_block */
1786 res = 1LL << 32;
1787 res <<= blkbits;
1788 res -= 1;
1789
1790 /* Sanity check against vm- & vfs- imposed limits */
1791 if (res > upper_limit)
1792 res = upper_limit;
1793
1794 return res;
1795}
ac27a0ec 1796
ac27a0ec 1797/*
cd2291a4 1798 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1799 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1800 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1801 */
cd2291a4 1802static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1803{
617ba13b 1804 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1805 int meta_blocks;
1806 loff_t upper_limit;
1807 /* This is calculated to be the largest file size for a
cd2291a4 1808 * dense, bitmapped file such that the total number of
ac27a0ec 1809 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1810 * does not exceed 2^48 -1
1811 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1812 * total number of 512 bytes blocks of the file
1813 */
1814
1815 if (sizeof(blkcnt_t) < sizeof(u64)) {
1816 /*
1817 * CONFIG_LSF is not enabled implies the inode
1818 * i_block represent total blocks in 512 bytes
1819 * 32 == size of vfs inode i_blocks * 8
1820 */
1821 upper_limit = (1LL << 32) - 1;
1822
1823 /* total blocks in file system block size */
1824 upper_limit >>= (bits - 9);
1825
1826 } else {
8180a562
AK		 1827 /*
1828 * We use 48 bit ext4_inode i_blocks
1829 * With EXT4_HUGE_FILE_FL set the i_blocks
1830 * represent total number of blocks in
1831 * file system block size
1832 */
0fc1b451
AK		 1833 upper_limit = (1LL << 48) - 1;
1834
0fc1b451
AK		 1835 }
1836
1837 /* indirect blocks */
1838 meta_blocks = 1;
1839 /* double indirect blocks */
1840 meta_blocks += 1 + (1LL << (bits-2));
1841 /* tripple indirect blocks */
1842 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1843
1844 upper_limit -= meta_blocks;
1845 upper_limit <<= bits;
ac27a0ec
DK		 1846
1847 res += 1LL << (bits-2);
1848 res += 1LL << (2*(bits-2));
1849 res += 1LL << (3*(bits-2));
1850 res <<= bits;
1851 if (res > upper_limit)
1852 res = upper_limit;
0fc1b451
AK		 1853
1854 if (res > MAX_LFS_FILESIZE)
1855 res = MAX_LFS_FILESIZE;
1856
ac27a0ec
DK		 1857 return res;
1858}
1859
617ba13b 1860static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1861 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1862{
617ba13b 1863 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1864 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1865 int has_super = 0;
1866
1867 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1868
617ba13b 1869 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1870 nr < first_meta_bg)
70bbb3e0 1871 return logical_sb_block + nr + 1;
ac27a0ec 1872 bg = sbi->s_desc_per_block * nr;
617ba13b 1873 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1874 has_super = 1;
617ba13b 1875 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1876}
1877
c9de560d
AT		 1878/**
1879 * ext4_get_stripe_size: Get the stripe size.
1880 * @sbi: In memory super block info
1881 *
1882 * If we have specified it via mount option, then
1883 * use the mount option value. If the value specified at mount time is
1884 * greater than the blocks per group use the super block value.
1885 * If the super block value is greater than blocks per group return 0.
1886 * Allocator needs it be less than blocks per group.
1887 *
1888 */
1889static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1890{
1891 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1892 unsigned long stripe_width =
1893 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1894
1895 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1896 return sbi->s_stripe;
1897
1898 if (stripe_width <= sbi->s_blocks_per_group)
1899 return stripe_width;
1900
1901 if (stride <= sbi->s_blocks_per_group)
1902 return stride;
1903
1904 return 0;
1905}
ac27a0ec 1906
2b2d6d01 1907static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 1908 __releases(kernel_lock)
1909 __acquires(kernel_lock)
1d03ec98 1910
ac27a0ec 1911{
2b2d6d01 1912 struct buffer_head *bh;
617ba13b
MC		 1913 struct ext4_super_block *es = NULL;
1914 struct ext4_sb_info *sbi;
1915 ext4_fsblk_t block;
1916 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1917 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1918 unsigned long offset = 0;
1919 unsigned int journal_inum = 0;
1920 unsigned long journal_devnum = 0;
1921 unsigned long def_mount_opts;
1922 struct inode *root;
1d1fe1ee 1923 int ret = -EINVAL;
ac27a0ec 1924 int blocksize;
ac27a0ec
DK		 1925 int db_count;
1926 int i;
1927 int needs_recovery;
1928 __le32 features;
bd81d8ee 1929 __u64 blocks_count;
833f4077 1930 int err;
ac27a0ec
DK		 1931
1932 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1933 if (!sbi)
1934 return -ENOMEM;
1935 sb->s_fs_info = sbi;
1936 sbi->s_mount_opt = 0;
617ba13b
MC		 1937 sbi->s_resuid = EXT4_DEF_RESUID;
1938 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1939 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1940
1941 unlock_kernel();
1942
617ba13b 1943 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1944 if (!blocksize) {
617ba13b 1945 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1946 goto out_fail;
1947 }
1948
1949 /*
617ba13b 1950 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1951 * block sizes. We need to calculate the offset from buffer start.
1952 */
617ba13b 1953 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1954 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1955 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1956 } else {
70bbb3e0 1957 logical_sb_block = sb_block;
ac27a0ec
DK		 1958 }
1959
70bbb3e0 1960 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 1961 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1962 goto out_fail;
1963 }
1964 /*
1965 * Note: s_es must be initialized as soon as possible because
617ba13b 1966 * some ext4 macro-instructions depend on its value
ac27a0ec 1967 */
617ba13b 1968 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1969 sbi->s_es = es;
1970 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1971 if (sb->s_magic != EXT4_SUPER_MAGIC)
1972 goto cantfind_ext4;
ac27a0ec
DK		 1973
1974 /* Set defaults before we parse the mount options */
1975 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1976 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1977 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1978 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1979 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1980 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1981 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1982#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1983 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1984 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1985#endif
1986#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1987 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1988 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1989#endif
617ba13b
MC		 1990 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1991 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1992 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1993 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1994 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1995 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1996
1997 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1998 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1999 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2000 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2001 else
2002 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2003
2004 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2005 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2006
2007 set_opt(sbi->s_mount_opt, RESERVATION);
571640ca 2008 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2009
1e2462f9
MC		 2010 /*
2011 * turn on extents feature by default in ext4 filesystem
e4079a11
ES		 2012 * only if feature flag already set by mkfs or tune2fs.
2013 * Use -o noextents to turn it off
1e2462f9 2014 */
e4079a11
ES		 2015 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2016 set_opt(sbi->s_mount_opt, EXTENTS);
2017 else
2018 ext4_warning(sb, __func__,
2019 "extents feature not enabled on this filesystem, "
2020 "use tune2fs.\n");
3dbd0ede 2021 /*
e4079a11
ES		 2022 * turn on mballoc code by default in ext4 filesystem
2023 * Use -o nomballoc to turn it off
3dbd0ede
AK		 2024 */
2025 set_opt(sbi->s_mount_opt, MBALLOC);
1e2462f9 2026
dd919b98
AK		 2027 /*
2028 * enable delayed allocation by default
2029 * Use -o nodelalloc to turn it off
2030 */
2031 set_opt(sbi->s_mount_opt, DELALLOC);
2032
2033
2b2d6d01
TT		 2034 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2035 NULL, 0))
ac27a0ec
DK		 2036 goto failed_mount;
2037
2038 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2039 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2040
617ba13b
MC		 2041 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2042 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2043 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2044 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2045 printk(KERN_WARNING
617ba13b 2046 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2047 "running e2fsck is recommended\n");
469108ff
TT		 2048
2049 /*
2050 * Since ext4 is still considered development code, we require
2051 * that the TEST_FILESYS flag in s->flags be set.
2052 */
2053 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2054 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2055 "OK to use with test code.\n", sb->s_id);
2056 goto failed_mount;
2057 }
2058
ac27a0ec
DK		 2059 /*
2060 * Check feature flags regardless of the revision level, since we
2061 * previously didn't change the revision level when setting the flags,
2062 * so there is a chance incompat flags are set on a rev 0 filesystem.
2063 */
617ba13b 2064 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2065 if (features) {
617ba13b 2066 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 2067 "unsupported optional features (%x).\n",
2068 sb->s_id, le32_to_cpu(features));
2069 goto failed_mount;
2070 }
617ba13b 2071 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2072 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2073 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 2074 "unsupported optional features (%x).\n",
2075 sb->s_id, le32_to_cpu(features));
2076 goto failed_mount;
2077 }
0fc1b451
AK		 2078 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2079 /*
2080 * Large file size enabled file system can only be
2081 * mount if kernel is build with CONFIG_LSF
2082 */
2083 if (sizeof(root->i_blocks) < sizeof(u64) &&
2084 !(sb->s_flags & MS_RDONLY)) {
2085 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2086 "files cannot be mounted read-write "
2087 "without CONFIG_LSF.\n", sb->s_id);
2088 goto failed_mount;
2089 }
2090 }
ac27a0ec
DK		 2091 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2092
617ba13b
MC		 2093 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2094 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2095 printk(KERN_ERR
617ba13b 2096 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2097 blocksize, sb->s_id);
2098 goto failed_mount;
2099 }
2100
ac27a0ec 2101 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2102
2103 /* Validate the filesystem blocksize */
2104 if (!sb_set_blocksize(sb, blocksize)) {
2105 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2106 blocksize);
ac27a0ec
DK		 2107 goto failed_mount;
2108 }
2109
2b2d6d01 2110 brelse(bh);
70bbb3e0
AM		 2111 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2112 offset = do_div(logical_sb_block, blocksize);
2113 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2114 if (!bh) {
2115 printk(KERN_ERR
617ba13b 2116 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2117 goto failed_mount;
2118 }
617ba13b 2119 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2120 sbi->s_es = es;
617ba13b 2121 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2122 printk(KERN_ERR
2123 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2124 goto failed_mount;
2125 }
2126 }
2127
e2b46574 2128 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 2129 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 2130
617ba13b
MC		 2131 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2132 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2133 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2134 } else {
2135 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2136 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2137 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2138 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2139 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2140 printk(KERN_ERR
2141 "EXT4-fs: unsupported inode size: %d\n",
2142 sbi->s_inode_size);
ac27a0ec
DK		 2143 goto failed_mount;
2144 }
ef7f3835
KS		 2145 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2146 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2147 }
0d1ee42f
AR		 2148 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2149 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2150 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2151 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2152 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2153 printk(KERN_ERR
8fadc143 2154 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2155 sbi->s_desc_size);
2156 goto failed_mount;
2157 }
2158 } else
2159 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2160 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2161 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2162 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2163 goto cantfind_ext4;
2164 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2165 if (sbi->s_inodes_per_block == 0)
617ba13b 2166 goto cantfind_ext4;
ac27a0ec
DK		 2167 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2168 sbi->s_inodes_per_block;
0d1ee42f 2169 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2170 sbi->s_sbh = bh;
2171 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2172 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2173 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2174 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2175 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2176 sbi->s_def_hash_version = es->s_def_hash_version;
2177
2178 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2179 printk(KERN_ERR
2180 "EXT4-fs: #blocks per group too big: %lu\n",
2181 sbi->s_blocks_per_group);
ac27a0ec
DK		 2182 goto failed_mount;
2183 }
ac27a0ec 2184 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2185 printk(KERN_ERR
2186 "EXT4-fs: #inodes per group too big: %lu\n",
2187 sbi->s_inodes_per_group);
ac27a0ec
DK		 2188 goto failed_mount;
2189 }
2190
bd81d8ee 2191 if (ext4_blocks_count(es) >
ac27a0ec 2192 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2193 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2194 " too large to mount safely\n", sb->s_id);
2195 if (sizeof(sector_t) < 8)
617ba13b 2196 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2197 "enabled\n");
2198 goto failed_mount;
2199 }
2200
617ba13b
MC		 2201 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2202 goto cantfind_ext4;
e7c95593
ES		 2203
2204 /* ensure blocks_count calculation below doesn't sign-extend */
2205 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2206 le32_to_cpu(es->s_first_data_block) + 1) {
2207 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2208 "first data block %u, blocks per group %lu\n",
2209 ext4_blocks_count(es),
2210 le32_to_cpu(es->s_first_data_block),
2211 EXT4_BLOCKS_PER_GROUP(sb));
2212 goto failed_mount;
2213 }
bd81d8ee
LV		 2214 blocks_count = (ext4_blocks_count(es) -
2215 le32_to_cpu(es->s_first_data_block) +
2216 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2217 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2218 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2219 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2220 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2221 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2222 GFP_KERNEL);
2223 if (sbi->s_group_desc == NULL) {
2b2d6d01 2224 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2225 goto failed_mount;
2226 }
2227
2228 bgl_lock_init(&sbi->s_blockgroup_lock);
2229
2230 for (i = 0; i < db_count; i++) {
70bbb3e0 2231 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2232 sbi->s_group_desc[i] = sb_bread(sb, block);
2233 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2234 printk(KERN_ERR "EXT4-fs: "
2235 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2236 db_count = i;
2237 goto failed_mount2;
2238 }
2239 }
2b2d6d01 2240 if (!ext4_check_descriptors(sb)) {
617ba13b 2241 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2242 goto failed_mount2;
2243 }
772cb7c8
JS		 2244 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2245 if (!ext4_fill_flex_info(sb)) {
2246 printk(KERN_ERR
2247 "EXT4-fs: unable to initialize "
2248 "flex_bg meta info!\n");
2249 goto failed_mount2;
2250 }
2251
ac27a0ec
DK		 2252 sbi->s_gdb_count = db_count;
2253 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2254 spin_lock_init(&sbi->s_next_gen_lock);
2255
833f4077
PZ		 2256 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2257 ext4_count_free_blocks(sb));
2258 if (!err) {
2259 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2260 ext4_count_free_inodes(sb));
2261 }
2262 if (!err) {
2263 err = percpu_counter_init(&sbi->s_dirs_counter,
2264 ext4_count_dirs(sb));
2265 }
6bc6e63f
AK		 2266 if (!err) {
2267 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2268 }
833f4077
PZ		 2269 if (err) {
2270 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2271 goto failed_mount3;
2272 }
ac27a0ec
DK		 2273
2274 /* per fileystem reservation list head & lock */
2275 spin_lock_init(&sbi->s_rsv_window_lock);
2276 sbi->s_rsv_window_root = RB_ROOT;
2277 /* Add a single, static dummy reservation to the start of the
2278 * reservation window list --- it gives us a placeholder for
2279 * append-at-start-of-list which makes the allocation logic
2280 * _much_ simpler. */
617ba13b
MC		 2281 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2282 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2283 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2284 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2285 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2286
c9de560d
AT		 2287 sbi->s_stripe = ext4_get_stripe_size(sbi);
2288
ac27a0ec
DK		 2289 /*
2290 * set up enough so that it can read an inode
2291 */
617ba13b
MC		 2292 sb->s_op = &ext4_sops;
2293 sb->s_export_op = &ext4_export_ops;
2294 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2295#ifdef CONFIG_QUOTA
617ba13b
MC		 2296 sb->s_qcop = &ext4_qctl_operations;
2297 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2298#endif
2299 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2300
2301 sb->s_root = NULL;
2302
2303 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2304 EXT4_HAS_INCOMPAT_FEATURE(sb,
2305 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2306
2307 /*
2308 * The first inode we look at is the journal inode. Don't try
2309 * root first: it may be modified in the journal!
2310 */
2311 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2312 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2313 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2314 goto failed_mount3;
624080ed
TT		 2315 if (!(sb->s_flags & MS_RDONLY) &&
2316 EXT4_SB(sb)->s_journal->j_failed_commit) {
2317 printk(KERN_CRIT "EXT4-fs error (device %s): "
2318 "ext4_fill_super: Journal transaction "
2b2d6d01 2319 "%u is corrupt\n", sb->s_id,
624080ed 2320 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2321 if (test_opt(sb, ERRORS_RO)) {
2322 printk(KERN_CRIT
2323 "Mounting filesystem read-only\n");
624080ed
TT		 2324 sb->s_flags |= MS_RDONLY;
2325 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2326 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2327 }
2328 if (test_opt(sb, ERRORS_PANIC)) {
2329 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2330 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2331 ext4_commit_super(sb, es, 1);
2332 printk(KERN_CRIT
2333 "EXT4-fs (device %s): mount failed\n",
2334 sb->s_id);
2335 goto failed_mount4;
2336 }
2337 }
ac27a0ec 2338 } else if (journal_inum) {
617ba13b 2339 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2340 goto failed_mount3;
2341 } else {
2342 if (!silent)
2b2d6d01
TT		 2343 printk(KERN_ERR
2344 "ext4: No journal on filesystem on %s\n",
2345 sb->s_id);
ac27a0ec
DK		 2346 goto failed_mount3;
2347 }
2348
eb40a09c
JS		 2349 if (ext4_blocks_count(es) > 0xffffffffULL &&
2350 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2351 JBD2_FEATURE_INCOMPAT_64BIT)) {
2352 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2353 goto failed_mount4;
2354 }
2355
818d276c
GS		 2356 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2357 jbd2_journal_set_features(sbi->s_journal,
2358 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2359 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2360 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2361 jbd2_journal_set_features(sbi->s_journal,
2362 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2363 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2364 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2365 } else {
2366 jbd2_journal_clear_features(sbi->s_journal,
2367 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2368 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2369 }
2370
ac27a0ec
DK		 2371 /* We have now updated the journal if required, so we can
2372 * validate the data journaling mode. */
2373 switch (test_opt(sb, DATA_FLAGS)) {
2374 case 0:
2375 /* No mode set, assume a default based on the journal
63f57933
AM		 2376 * capabilities: ORDERED_DATA if the journal can
2377 * cope, else JOURNAL_DATA
2378 */
dab291af
MC		 2379 if (jbd2_journal_check_available_features
2380 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2381 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2382 else
2383 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2384 break;
2385
617ba13b
MC		 2386 case EXT4_MOUNT_ORDERED_DATA:
2387 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2388 if (!jbd2_journal_check_available_features
2389 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2390 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2391 "requested data journaling mode\n");
2392 goto failed_mount4;
2393 }
2394 default:
2395 break;
2396 }
2397
2398 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2399 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2400 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2401 "its supported only with writeback mode\n");
2402 clear_opt(sbi->s_mount_opt, NOBH);
2403 }
2404 }
2405 /*
dab291af 2406 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2407 * so we can safely mount the rest of the filesystem now.
2408 */
2409
1d1fe1ee
DH		 2410 root = ext4_iget(sb, EXT4_ROOT_INO);
2411 if (IS_ERR(root)) {
617ba13b 2412 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2413 ret = PTR_ERR(root);
ac27a0ec
DK		 2414 goto failed_mount4;
2415 }
2416 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2417 iput(root);
617ba13b 2418 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2419 goto failed_mount4;
2420 }
1d1fe1ee
DH		 2421 sb->s_root = d_alloc_root(root);
2422 if (!sb->s_root) {
2423 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2424 iput(root);
2425 ret = -ENOMEM;
2426 goto failed_mount4;
2427 }
ac27a0ec 2428
2b2d6d01 2429 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2430
2431 /* determine the minimum size of new large inodes, if present */
2432 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2433 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2434 EXT4_GOOD_OLD_INODE_SIZE;
2435 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2436 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2437 if (sbi->s_want_extra_isize <
2438 le16_to_cpu(es->s_want_extra_isize))
2439 sbi->s_want_extra_isize =
2440 le16_to_cpu(es->s_want_extra_isize);
2441 if (sbi->s_want_extra_isize <
2442 le16_to_cpu(es->s_min_extra_isize))
2443 sbi->s_want_extra_isize =
2444 le16_to_cpu(es->s_min_extra_isize);
2445 }
2446 }
2447 /* Check if enough inode space is available */
2448 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2449 sbi->s_inode_size) {
2450 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2451 EXT4_GOOD_OLD_INODE_SIZE;
2452 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2453 "available.\n");
2454 }
2455
ac27a0ec
DK		 2456 /*
2457 * akpm: core read_super() calls in here with the superblock locked.
2458 * That deadlocks, because orphan cleanup needs to lock the superblock
2459 * in numerous places. Here we just pop the lock - it's relatively
2460 * harmless, because we are now ready to accept write_super() requests,
2461 * and aviro says that's the only reason for hanging onto the
2462 * superblock lock.
2463 */
617ba13b
MC		 2464 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2465 ext4_orphan_cleanup(sb, es);
2466 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2467 if (needs_recovery)
2b2d6d01 2468 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
617ba13b 2469 ext4_mark_recovery_complete(sb, es);
2b2d6d01
TT		 2470 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2471 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2472 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2473 "writeback");
ac27a0ec 2474
dd919b98
AK		 2475 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2476 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2477 "requested data journaling mode\n");
2478 clear_opt(sbi->s_mount_opt, DELALLOC);
2479 } else if (test_opt(sb, DELALLOC))
2480 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2481
a86c6181 2482 ext4_ext_init(sb);
c9de560d 2483 ext4_mb_init(sb, needs_recovery);
a86c6181 2484
ac27a0ec
DK		 2485 lock_kernel();
2486 return 0;
2487
617ba13b 2488cantfind_ext4:
ac27a0ec 2489 if (!silent)
617ba13b 2490 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2491 sb->s_id);
2492 goto failed_mount;
2493
2494failed_mount4:
dab291af 2495 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 2496 sbi->s_journal = NULL;
ac27a0ec
DK		 2497failed_mount3:
2498 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2499 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2500 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2501 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2502failed_mount2:
2503 for (i = 0; i < db_count; i++)
2504 brelse(sbi->s_group_desc[i]);
2505 kfree(sbi->s_group_desc);
2506failed_mount:
2507#ifdef CONFIG_QUOTA
2508 for (i = 0; i < MAXQUOTAS; i++)
2509 kfree(sbi->s_qf_names[i]);
2510#endif
617ba13b 2511 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2512 brelse(bh);
2513out_fail:
2514 sb->s_fs_info = NULL;
2515 kfree(sbi);
2516 lock_kernel();
1d1fe1ee 2517 return ret;
ac27a0ec
DK		 2518}
2519
2520/*
2521 * Setup any per-fs journal parameters now. We'll do this both on
2522 * initial mount, once the journal has been initialised but before we've
2523 * done any recovery; and again on any subsequent remount.
2524 */
617ba13b 2525static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2526{
617ba13b 2527 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2528
2529 if (sbi->s_commit_interval)
2530 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2531 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2532 * interval here, but for now we'll just fall back to the jbd
2533 * default. */
2534
2535 spin_lock(&journal->j_state_lock);
2536 if (test_opt(sb, BARRIER))
dab291af 2537 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2538 else
dab291af 2539 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2540 spin_unlock(&journal->j_state_lock);
2541}
2542
617ba13b 2543static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2544 unsigned int journal_inum)
2545{
2546 struct inode *journal_inode;
2547 journal_t *journal;
2548
2549 /* First, test for the existence of a valid inode on disk. Bad
2550 * things happen if we iget() an unused inode, as the subsequent
2551 * iput() will try to delete it. */
2552
1d1fe1ee
DH		 2553 journal_inode = ext4_iget(sb, journal_inum);
2554 if (IS_ERR(journal_inode)) {
617ba13b 2555 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2556 return NULL;
2557 }
2558 if (!journal_inode->i_nlink) {
2559 make_bad_inode(journal_inode);
2560 iput(journal_inode);
617ba13b 2561 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2562 return NULL;
2563 }
2564
e5f8eab8 2565 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2566 journal_inode, journal_inode->i_size);
1d1fe1ee 2567 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2568 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2569 iput(journal_inode);
2570 return NULL;
2571 }
2572
dab291af 2573 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2574 if (!journal) {
617ba13b 2575 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2576 iput(journal_inode);
2577 return NULL;
2578 }
2579 journal->j_private = sb;
617ba13b 2580 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2581 return journal;
2582}
2583
617ba13b 2584static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2585 dev_t j_dev)
2586{
2b2d6d01 2587 struct buffer_head *bh;
ac27a0ec 2588 journal_t *journal;
617ba13b
MC		 2589 ext4_fsblk_t start;
2590 ext4_fsblk_t len;
ac27a0ec 2591 int hblock, blocksize;
617ba13b 2592 ext4_fsblk_t sb_block;
ac27a0ec 2593 unsigned long offset;
2b2d6d01 2594 struct ext4_super_block *es;
ac27a0ec
DK		 2595 struct block_device *bdev;
2596
617ba13b 2597 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2598 if (bdev == NULL)
2599 return NULL;
2600
2601 if (bd_claim(bdev, sb)) {
2602 printk(KERN_ERR
8c55e204 2603 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2604 blkdev_put(bdev);
2605 return NULL;
2606 }
2607
2608 blocksize = sb->s_blocksize;
2609 hblock = bdev_hardsect_size(bdev);
2610 if (blocksize < hblock) {
2611 printk(KERN_ERR
617ba13b 2612 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2613 goto out_bdev;
2614 }
2615
617ba13b
MC		 2616 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2617 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2618 set_blocksize(bdev, blocksize);
2619 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2620 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2621 "external journal\n");
2622 goto out_bdev;
2623 }
2624
617ba13b
MC		 2625 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2626 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2627 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2628 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2629 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2630 "bad superblock\n");
2631 brelse(bh);
2632 goto out_bdev;
2633 }
2634
617ba13b
MC		 2635 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2636 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2637 brelse(bh);
2638 goto out_bdev;
2639 }
2640
bd81d8ee 2641 len = ext4_blocks_count(es);
ac27a0ec
DK		 2642 start = sb_block + 1;
2643 brelse(bh); /* we're done with the superblock */
2644
dab291af 2645 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2646 start, len, blocksize);
2647 if (!journal) {
617ba13b 2648 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2649 goto out_bdev;
2650 }
2651 journal->j_private = sb;
2652 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2653 wait_on_buffer(journal->j_sb_buffer);
2654 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2655 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2656 goto out_journal;
2657 }
2658 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2659 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2660 "user (unsupported) - %d\n",
2661 be32_to_cpu(journal->j_superblock->s_nr_users));
2662 goto out_journal;
2663 }
617ba13b
MC		 2664 EXT4_SB(sb)->journal_bdev = bdev;
2665 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2666 return journal;
2667out_journal:
dab291af 2668 jbd2_journal_destroy(journal);
ac27a0ec 2669out_bdev:
617ba13b 2670 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2671 return NULL;
2672}
2673
617ba13b
MC		 2674static int ext4_load_journal(struct super_block *sb,
2675 struct ext4_super_block *es,
ac27a0ec
DK		 2676 unsigned long journal_devnum)
2677{
2678 journal_t *journal;
2679 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2680 dev_t journal_dev;
2681 int err = 0;
2682 int really_read_only;
2683
2684 if (journal_devnum &&
2685 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2686 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2687 "numbers have changed\n");
2688 journal_dev = new_decode_dev(journal_devnum);
2689 } else
2690 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2691
2692 really_read_only = bdev_read_only(sb->s_bdev);
2693
2694 /*
2695 * Are we loading a blank journal or performing recovery after a
2696 * crash? For recovery, we need to check in advance whether we
2697 * can get read-write access to the device.
2698 */
2699
617ba13b 2700 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2701 if (sb->s_flags & MS_RDONLY) {
617ba13b 2702 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2703 "required on readonly filesystem.\n");
2704 if (really_read_only) {
617ba13b 2705 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2706 "unavailable, cannot proceed.\n");
2707 return -EROFS;
2708 }
2b2d6d01
TT		 2709 printk(KERN_INFO "EXT4-fs: write access will "
2710 "be enabled during recovery.\n");
ac27a0ec
DK		 2711 }
2712 }
2713
2714 if (journal_inum && journal_dev) {
617ba13b 2715 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2716 "and inode journals!\n");
2717 return -EINVAL;
2718 }
2719
2720 if (journal_inum) {
617ba13b 2721 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2722 return -EINVAL;
2723 } else {
617ba13b 2724 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2725 return -EINVAL;
2726 }
2727
4776004f
TT		 2728 if (journal->j_flags & JBD2_BARRIER)
2729 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2730 else
2731 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2732
ac27a0ec 2733 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2734 err = jbd2_journal_update_format(journal);
ac27a0ec 2735 if (err) {
617ba13b 2736 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2737 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2738 return err;
2739 }
2740 }
2741
617ba13b 2742 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2743 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2744 if (!err)
dab291af 2745 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2746
2747 if (err) {
617ba13b 2748 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2749 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2750 return err;
2751 }
2752
617ba13b
MC		 2753 EXT4_SB(sb)->s_journal = journal;
2754 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2755
2756 if (journal_devnum &&
2757 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2758 es->s_journal_dev = cpu_to_le32(journal_devnum);
2759 sb->s_dirt = 1;
2760
2761 /* Make sure we flush the recovery flag to disk. */
617ba13b 2762 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2763 }
2764
2765 return 0;
2766}
2767
2b2d6d01
TT		 2768static int ext4_create_journal(struct super_block *sb,
2769 struct ext4_super_block *es,
ac27a0ec
DK		 2770 unsigned int journal_inum)
2771{
2772 journal_t *journal;
6c675bd4 2773 int err;
ac27a0ec
DK		 2774
2775 if (sb->s_flags & MS_RDONLY) {
617ba13b 2776 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2777 "create journal.\n");
2778 return -EROFS;
2779 }
2780
6c675bd4
BP		 2781 journal = ext4_get_journal(sb, journal_inum);
2782 if (!journal)
ac27a0ec
DK		 2783 return -EINVAL;
2784
617ba13b 2785 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2786 journal_inum);
2787
6c675bd4
BP		 2788 err = jbd2_journal_create(journal);
2789 if (err) {
617ba13b 2790 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2791 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2792 return -EIO;
2793 }
2794
617ba13b 2795 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2796
617ba13b
MC		 2797 ext4_update_dynamic_rev(sb);
2798 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2799 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2800
2801 es->s_journal_inum = cpu_to_le32(journal_inum);
2802 sb->s_dirt = 1;
2803
2804 /* Make sure we flush the recovery flag to disk. */
617ba13b 2805 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2806
2807 return 0;
2808}
2809
2b2d6d01
TT		 2810static void ext4_commit_super(struct super_block *sb,
2811 struct ext4_super_block *es, int sync)
ac27a0ec 2812{
617ba13b 2813 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2814
2815 if (!sbh)
2816 return;
2817 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2818 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2819 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2820 BUFFER_TRACE(sbh, "marking dirty");
2821 mark_buffer_dirty(sbh);
2822 if (sync)
2823 sync_dirty_buffer(sbh);
2824}
2825
2826
2827/*
2828 * Have we just finished recovery? If so, and if we are mounting (or
2829 * remounting) the filesystem readonly, then we will end up with a
2830 * consistent fs on disk. Record that fact.
2831 */
2b2d6d01
TT		 2832static void ext4_mark_recovery_complete(struct super_block *sb,
2833 struct ext4_super_block *es)
ac27a0ec 2834{
617ba13b 2835 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2836
dab291af
MC		 2837 jbd2_journal_lock_updates(journal);
2838 jbd2_journal_flush(journal);
32c37730 2839 lock_super(sb);
617ba13b 2840 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2841 sb->s_flags & MS_RDONLY) {
617ba13b 2842 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2843 sb->s_dirt = 0;
617ba13b 2844 ext4_commit_super(sb, es, 1);
ac27a0ec 2845 }
32c37730 2846 unlock_super(sb);
dab291af 2847 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2848}
2849
2850/*
2851 * If we are mounting (or read-write remounting) a filesystem whose journal
2852 * has recorded an error from a previous lifetime, move that error to the
2853 * main filesystem now.
2854 */
2b2d6d01
TT		 2855static void ext4_clear_journal_err(struct super_block *sb,
2856 struct ext4_super_block *es)
ac27a0ec
DK		 2857{
2858 journal_t *journal;
2859 int j_errno;
2860 const char *errstr;
2861
617ba13b 2862 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2863
2864 /*
2865 * Now check for any error status which may have been recorded in the
617ba13b 2866 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2867 */
2868
dab291af 2869 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2870 if (j_errno) {
2871 char nbuf[16];
2872
617ba13b 2873 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 2874 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 2875 "from previous mount: %s", errstr);
46e665e9 2876 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 2877 "filesystem check.");
2878
617ba13b
MC		 2879 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2880 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 2881 ext4_commit_super(sb, es, 1);
ac27a0ec 2882
dab291af 2883 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2884 }
2885}
2886
2887/*
2888 * Force the running and committing transactions to commit,
2889 * and wait on the commit.
2890 */
617ba13b 2891int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2892{
2893 journal_t *journal;
2894 int ret;
2895
2896 if (sb->s_flags & MS_RDONLY)
2897 return 0;
2898
617ba13b 2899 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2900 sb->s_dirt = 0;
617ba13b 2901 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2902 return ret;
2903}
2904
2905/*
617ba13b 2906 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2907 * have to propagate any other updates to the superblock on disk at this
2908 * point. Just start an async writeback to get the buffers on their way
2909 * to the disk.
2910 *
2911 * This implicitly triggers the writebehind on sync().
2912 */
2913
2b2d6d01 2914static void ext4_write_super(struct super_block *sb)
ac27a0ec
DK		 2915{
2916 if (mutex_trylock(&sb->s_lock) != 0)
2917 BUG();
2918 sb->s_dirt = 0;
2919}
2920
617ba13b 2921static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2922{
2923 tid_t target;
2924
2925 sb->s_dirt = 0;
dab291af 2926 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2927 if (wait)
dab291af 2928 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2929 }
2930 return 0;
2931}
2932
2933/*
2934 * LVM calls this function before a (read-only) snapshot is created. This
2935 * gives us a chance to flush the journal completely and mark the fs clean.
2936 */
617ba13b 2937static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2938{
2939 sb->s_dirt = 0;
2940
2941 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2942 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2943
2944 /* Now we set up the journal barrier. */
dab291af
MC		 2945 jbd2_journal_lock_updates(journal);
2946 jbd2_journal_flush(journal);
ac27a0ec
DK		 2947
2948 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2949 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2950 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2951 }
2952}
2953
2954/*
2955 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2956 * flag here, even though the filesystem is not technically dirty yet.
2957 */
617ba13b 2958static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2959{
2960 if (!(sb->s_flags & MS_RDONLY)) {
2961 lock_super(sb);
2962 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2963 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2964 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2965 unlock_super(sb);
dab291af 2966 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2967 }
2968}
2969
2b2d6d01 2970static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 2971{
2b2d6d01 2972 struct ext4_super_block *es;
617ba13b
MC		 2973 struct ext4_sb_info *sbi = EXT4_SB(sb);
2974 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2975 unsigned long old_sb_flags;
617ba13b 2976 struct ext4_mount_options old_opts;
8a266467 2977 ext4_group_t g;
ac27a0ec
DK		 2978 int err;
2979#ifdef CONFIG_QUOTA
2980 int i;
2981#endif
2982
2983 /* Store the original options */
2984 old_sb_flags = sb->s_flags;
2985 old_opts.s_mount_opt = sbi->s_mount_opt;
2986 old_opts.s_resuid = sbi->s_resuid;
2987 old_opts.s_resgid = sbi->s_resgid;
2988 old_opts.s_commit_interval = sbi->s_commit_interval;
2989#ifdef CONFIG_QUOTA
2990 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2991 for (i = 0; i < MAXQUOTAS; i++)
2992 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2993#endif
2994
2995 /*
2996 * Allow the "check" option to be passed as a remount option.
2997 */
2998 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2999 err = -EINVAL;
3000 goto restore_opts;
3001 }
3002
617ba13b 3003 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3004 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3005
3006 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3007 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3008
3009 es = sbi->s_es;
3010
617ba13b 3011 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 3012
3013 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3014 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3015 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3016 err = -EROFS;
3017 goto restore_opts;
3018 }
3019
3020 if (*flags & MS_RDONLY) {
3021 /*
3022 * First of all, the unconditional stuff we have to do
3023 * to disable replay of the journal when we next remount
3024 */
3025 sb->s_flags |= MS_RDONLY;
3026
3027 /*
3028 * OK, test if we are remounting a valid rw partition
3029 * readonly, and if so set the rdonly flag and then
3030 * mark the partition as valid again.
3031 */
617ba13b
MC		 3032 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3033 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3034 es->s_state = cpu_to_le16(sbi->s_mount_state);
3035
32c37730
JK		 3036 /*
3037 * We have to unlock super so that we can wait for
3038 * transactions.
3039 */
3040 unlock_super(sb);
617ba13b 3041 ext4_mark_recovery_complete(sb, es);
32c37730 3042 lock_super(sb);
ac27a0ec
DK		 3043 } else {
3044 __le32 ret;
617ba13b
MC		 3045 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3046 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3047 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 3048 "remount RDWR because of unsupported "
3049 "optional features (%x).\n",
3050 sb->s_id, le32_to_cpu(ret));
3051 err = -EROFS;
3052 goto restore_opts;
3053 }
ead6596b 3054
8a266467
TT		 3055 /*
3056 * Make sure the group descriptor checksums
3057 * are sane. If they aren't, refuse to
3058 * remount r/w.
3059 */
3060 for (g = 0; g < sbi->s_groups_count; g++) {
3061 struct ext4_group_desc *gdp =
3062 ext4_get_group_desc(sb, g, NULL);
3063
3064 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3065 printk(KERN_ERR
3066 "EXT4-fs: ext4_remount: "
3067 "Checksum for group %lu failed (%u!=%u)\n",
3068 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3069 le16_to_cpu(gdp->bg_checksum));
3070 err = -EINVAL;
3071 goto restore_opts;
3072 }
3073 }
3074
ead6596b
ES		 3075 /*
3076 * If we have an unprocessed orphan list hanging
3077 * around from a previously readonly bdev mount,
3078 * require a full umount/remount for now.
3079 */
3080 if (es->s_last_orphan) {
3081 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3082 "remount RDWR because of unprocessed "
3083 "orphan inode list. Please "
3084 "umount/remount instead.\n",
3085 sb->s_id);
3086 err = -EINVAL;
3087 goto restore_opts;
3088 }
3089
ac27a0ec
DK		 3090 /*
3091 * Mounting a RDONLY partition read-write, so reread
3092 * and store the current valid flag. (It may have
3093 * been changed by e2fsck since we originally mounted
3094 * the partition.)
3095 */
617ba13b 3096 ext4_clear_journal_err(sb, es);
ac27a0ec 3097 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3098 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3099 goto restore_opts;
2b2d6d01 3100 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3101 sb->s_flags &= ~MS_RDONLY;
3102 }
3103 }
3104#ifdef CONFIG_QUOTA
3105 /* Release old quota file names */
3106 for (i = 0; i < MAXQUOTAS; i++)
3107 if (old_opts.s_qf_names[i] &&
3108 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3109 kfree(old_opts.s_qf_names[i]);
3110#endif
3111 return 0;
3112restore_opts:
3113 sb->s_flags = old_sb_flags;
3114 sbi->s_mount_opt = old_opts.s_mount_opt;
3115 sbi->s_resuid = old_opts.s_resuid;
3116 sbi->s_resgid = old_opts.s_resgid;
3117 sbi->s_commit_interval = old_opts.s_commit_interval;
3118#ifdef CONFIG_QUOTA
3119 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3120 for (i = 0; i < MAXQUOTAS; i++) {
3121 if (sbi->s_qf_names[i] &&
3122 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3123 kfree(sbi->s_qf_names[i]);
3124 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3125 }
3126#endif
3127 return err;
3128}
3129
2b2d6d01 3130static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3131{
3132 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3133 struct ext4_sb_info *sbi = EXT4_SB(sb);
3134 struct ext4_super_block *es = sbi->s_es;
960cc398 3135 u64 fsid;
ac27a0ec 3136
5e70030d
BP		 3137 if (test_opt(sb, MINIX_DF)) {
3138 sbi->s_overhead_last = 0;
6bc9feff 3139 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3140 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3141 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3142 smp_rmb();
3143
3144 /*
5e70030d
BP		 3145 * Compute the overhead (FS structures). This is constant
3146 * for a given filesystem unless the number of block groups
3147 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3148 */
3149
3150 /*
3151 * All of the blocks before first_data_block are
3152 * overhead
3153 */
3154 overhead = le32_to_cpu(es->s_first_data_block);
3155
3156 /*
3157 * Add the overhead attributed to the superblock and
3158 * block group descriptors. If the sparse superblocks
3159 * feature is turned on, then not all groups have this.
3160 */
3161 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3162 overhead += ext4_bg_has_super(sb, i) +
3163 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3164 cond_resched();
3165 }
3166
3167 /*
3168 * Every block group has an inode bitmap, a block
3169 * bitmap, and an inode table.
3170 */
5e70030d
BP		 3171 overhead += ngroups * (2 + sbi->s_itb_per_group);
3172 sbi->s_overhead_last = overhead;
3173 smp_wmb();
6bc9feff 3174 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3175 }
3176
617ba13b 3177 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3178 buf->f_bsize = sb->s_blocksize;
5e70030d 3179 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3180 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3181 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3182 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3183 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3184 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3185 buf->f_bavail = 0;
3186 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3187 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3188 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3189 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3190 fsid = le64_to_cpup((void *)es->s_uuid) ^
3191 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3192 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3193 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3194 return 0;
3195}
3196
3197/* Helper function for writing quotas on sync - we need to start transaction before quota file
3198 * is locked for write. Otherwise the are possible deadlocks:
3199 * Process 1 Process 2
617ba13b 3200 * ext4_create() quota_sync()
dab291af 3201 * jbd2_journal_start() write_dquot()
ac27a0ec 3202 * DQUOT_INIT() down(dqio_mutex)
dab291af 3203 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3204 *
3205 */
3206
3207#ifdef CONFIG_QUOTA
3208
3209static inline struct inode *dquot_to_inode(struct dquot *dquot)
3210{
3211 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3212}
3213
617ba13b 3214static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3215{
3216 handle_t *handle;
3217 int ret, err;
3218
3219 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3220 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3221 if (IS_ERR(handle))
3222 return PTR_ERR(handle);
3223 ret = dquot_initialize(inode, type);
617ba13b 3224 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3225 if (!ret)
3226 ret = err;
3227 return ret;
3228}
3229
617ba13b 3230static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3231{
3232 handle_t *handle;
3233 int ret, err;
3234
3235 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3236 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2887df13
JK		 3237 if (IS_ERR(handle)) {
3238 /*
3239 * We call dquot_drop() anyway to at least release references
3240 * to quota structures so that umount does not hang.
3241 */
3242 dquot_drop(inode);
ac27a0ec 3243 return PTR_ERR(handle);
2887df13 3244 }
ac27a0ec 3245 ret = dquot_drop(inode);
617ba13b 3246 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3247 if (!ret)
3248 ret = err;
3249 return ret;
3250}
3251
617ba13b 3252static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3253{
3254 int ret, err;
3255 handle_t *handle;
3256 struct inode *inode;
3257
3258 inode = dquot_to_inode(dquot);
617ba13b
MC		 3259 handle = ext4_journal_start(inode,
3260 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3261 if (IS_ERR(handle))
3262 return PTR_ERR(handle);
3263 ret = dquot_commit(dquot);
617ba13b 3264 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3265 if (!ret)
3266 ret = err;
3267 return ret;
3268}
3269
617ba13b 3270static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3271{
3272 int ret, err;
3273 handle_t *handle;
3274
617ba13b
MC		 3275 handle = ext4_journal_start(dquot_to_inode(dquot),
3276 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3277 if (IS_ERR(handle))
3278 return PTR_ERR(handle);
3279 ret = dquot_acquire(dquot);
617ba13b 3280 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3281 if (!ret)
3282 ret = err;
3283 return ret;
3284}
3285
617ba13b 3286static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3287{
3288 int ret, err;
3289 handle_t *handle;
3290
617ba13b
MC		 3291 handle = ext4_journal_start(dquot_to_inode(dquot),
3292 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3293 if (IS_ERR(handle)) {
3294 /* Release dquot anyway to avoid endless cycle in dqput() */
3295 dquot_release(dquot);
ac27a0ec 3296 return PTR_ERR(handle);
9c3013e9 3297 }
ac27a0ec 3298 ret = dquot_release(dquot);
617ba13b 3299 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3300 if (!ret)
3301 ret = err;
3302 return ret;
3303}
3304
617ba13b 3305static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3306{
2c8be6b2 3307 /* Are we journaling quotas? */
617ba13b
MC		 3308 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3309 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3310 dquot_mark_dquot_dirty(dquot);
617ba13b 3311 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3312 } else {
3313 return dquot_mark_dquot_dirty(dquot);
3314 }
3315}
3316
617ba13b 3317static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3318{
3319 int ret, err;
3320 handle_t *handle;
3321
3322 /* Data block + inode block */
617ba13b 3323 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3324 if (IS_ERR(handle))
3325 return PTR_ERR(handle);
3326 ret = dquot_commit_info(sb, type);
617ba13b 3327 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3328 if (!ret)
3329 ret = err;
3330 return ret;
3331}
3332
3333/*
3334 * Turn on quotas during mount time - we need to find
3335 * the quota file and such...
3336 */
617ba13b 3337static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3338{
617ba13b
MC		 3339 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3340 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3341}
3342
3343/*
3344 * Standard function to be called on quota_on
3345 */
617ba13b 3346static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6f28e087 3347 char *path, int remount)
ac27a0ec
DK		 3348{
3349 int err;
3350 struct nameidata nd;
3351
3352 if (!test_opt(sb, QUOTA))
3353 return -EINVAL;
0623543b
JK		 3354 /* When remounting, no checks are needed and in fact, path is NULL */
3355 if (remount)
6f28e087 3356 return vfs_quota_on(sb, type, format_id, path, remount);
0623543b 3357
ac27a0ec
DK		 3358 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3359 if (err)
3360 return err;
0623543b 3361
ac27a0ec 3362 /* Quotafile not on the same filesystem? */
4ac91378 3363 if (nd.path.mnt->mnt_sb != sb) {
1d957f9b 3364 path_put(&nd.path);
ac27a0ec
DK		 3365 return -EXDEV;
3366 }
0623543b
JK		 3367 /* Journaling quota? */
3368 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3369 /* Quotafile not in fs root? */
0623543b
JK		 3370 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3371 printk(KERN_WARNING
3372 "EXT4-fs: Quota file not on filesystem root. "
3373 "Journaled quota will not work.\n");
2b2d6d01 3374 }
0623543b
JK		 3375
3376 /*
3377 * When we journal data on quota file, we have to flush journal to see
3378 * all updates to the file when we bypass pagecache...
3379 */
3380 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3381 /*
3382 * We don't need to lock updates but journal_flush() could
3383 * otherwise be livelocked...
3384 */
3385 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3386 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3387 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3388 }
3389
77e69dac 3390 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
1d957f9b 3391 path_put(&nd.path);
77e69dac 3392 return err;
ac27a0ec
DK		 3393}
3394
3395/* Read data from quotafile - avoid pagecache and such because we cannot afford
3396 * acquiring the locks... As quota files are never truncated and quota code
3397 * itself serializes the operations (and noone else should touch the files)
3398 * we don't have to be afraid of races */
617ba13b 3399static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3400 size_t len, loff_t off)
3401{
3402 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3403 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3404 int err = 0;
3405 int offset = off & (sb->s_blocksize - 1);
3406 int tocopy;
3407 size_t toread;
3408 struct buffer_head *bh;
3409 loff_t i_size = i_size_read(inode);
3410
3411 if (off > i_size)
3412 return 0;
3413 if (off+len > i_size)
3414 len = i_size-off;
3415 toread = len;
3416 while (toread > 0) {
3417 tocopy = sb->s_blocksize - offset < toread ?
3418 sb->s_blocksize - offset : toread;
617ba13b 3419 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3420 if (err)
3421 return err;
3422 if (!bh) /* A hole? */
3423 memset(data, 0, tocopy);
3424 else
3425 memcpy(data, bh->b_data+offset, tocopy);
3426 brelse(bh);
3427 offset = 0;
3428 toread -= tocopy;
3429 data += tocopy;
3430 blk++;
3431 }
3432 return len;
3433}
3434
3435/* Write to quotafile (we know the transaction is already started and has
3436 * enough credits) */
617ba13b 3437static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3438 const char *data, size_t len, loff_t off)
3439{
3440 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3441 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3442 int err = 0;
3443 int offset = off & (sb->s_blocksize - 1);
3444 int tocopy;
617ba13b 3445 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3446 size_t towrite = len;
3447 struct buffer_head *bh;
3448 handle_t *handle = journal_current_handle();
3449
9c3013e9 3450 if (!handle) {
e5f8eab8 3451 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3452 " cancelled because transaction is not started.\n",
3453 (unsigned long long)off, (unsigned long long)len);
3454 return -EIO;
3455 }
ac27a0ec
DK		 3456 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3457 while (towrite > 0) {
3458 tocopy = sb->s_blocksize - offset < towrite ?
3459 sb->s_blocksize - offset : towrite;
617ba13b 3460 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3461 if (!bh)
3462 goto out;
3463 if (journal_quota) {
617ba13b 3464 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3465 if (err) {
3466 brelse(bh);
3467 goto out;
3468 }
3469 }
3470 lock_buffer(bh);
3471 memcpy(bh->b_data+offset, data, tocopy);
3472 flush_dcache_page(bh->b_page);
3473 unlock_buffer(bh);
3474 if (journal_quota)
617ba13b 3475 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3476 else {
3477 /* Always do at least ordered writes for quotas */
678aaf48 3478 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3479 mark_buffer_dirty(bh);
3480 }
3481 brelse(bh);
3482 if (err)
3483 goto out;
3484 offset = 0;
3485 towrite -= tocopy;
3486 data += tocopy;
3487 blk++;
3488 }
3489out:
4d04e4fb
JK		 3490 if (len == towrite) {
3491 mutex_unlock(&inode->i_mutex);
ac27a0ec 3492 return err;
4d04e4fb 3493 }
ac27a0ec
DK		 3494 if (inode->i_size < off+len-towrite) {
3495 i_size_write(inode, off+len-towrite);
617ba13b 3496 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3497 }
ac27a0ec 3498 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3499 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3500 mutex_unlock(&inode->i_mutex);
3501 return len - towrite;
3502}
3503
3504#endif
3505
617ba13b 3506static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3507 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3508{
617ba13b 3509 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3510}
3511
617ba13b 3512static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3513 .owner = THIS_MODULE,
617ba13b
MC		 3514 .name = "ext4dev",
3515 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3516 .kill_sb = kill_block_super,
3517 .fs_flags = FS_REQUIRES_DEV,
3518};
3519
617ba13b 3520static int __init init_ext4_fs(void)
ac27a0ec 3521{
c9de560d
AT		 3522 int err;
3523
3524 err = init_ext4_mballoc();
ac27a0ec
DK		 3525 if (err)
3526 return err;
c9de560d
AT		 3527
3528 err = init_ext4_xattr();
3529 if (err)
3530 goto out2;
ac27a0ec
DK		 3531 err = init_inodecache();
3532 if (err)
3533 goto out1;
63f57933 3534 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3535 if (err)
3536 goto out;
3537 return 0;
3538out:
3539 destroy_inodecache();
3540out1:
617ba13b 3541 exit_ext4_xattr();
c9de560d
AT		 3542out2:
3543 exit_ext4_mballoc();
ac27a0ec
DK		 3544 return err;
3545}
3546
617ba13b 3547static void __exit exit_ext4_fs(void)
ac27a0ec 3548{
617ba13b 3549 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3550 destroy_inodecache();
617ba13b 3551 exit_ext4_xattr();
c9de560d 3552 exit_ext4_mballoc();
ac27a0ec
DK		 3553}
3554
3555MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3556MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3557MODULE_LICENSE("GPL");
617ba13b
MC		 3558module_init(init_ext4_fs)
3559module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)