projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ext4: Don't use 'struct dentry' for internal lookups
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
dab291af 23#include <linux/jbd2.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
27#include <linux/parser.h>
28#include <linux/smp_lock.h>
29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
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
05496769
TT		 1479 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1480 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1481 "external", EXT4_SB(sb)->s_journal->j_devname);
ac27a0ec
DK		 1482 return res;
1483}
1484
772cb7c8
JS		 1485static int ext4_fill_flex_info(struct super_block *sb)
1486{
1487 struct ext4_sb_info *sbi = EXT4_SB(sb);
1488 struct ext4_group_desc *gdp = NULL;
1489 struct buffer_head *bh;
1490 ext4_group_t flex_group_count;
1491 ext4_group_t flex_group;
1492 int groups_per_flex = 0;
1493 __u64 block_bitmap = 0;
1494 int i;
1495
1496 if (!sbi->s_es->s_log_groups_per_flex) {
1497 sbi->s_log_groups_per_flex = 0;
1498 return 1;
1499 }
1500
1501 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1502 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1503
c62a11fd
FB		 1504 /* We allocate both existing and potentially added groups */
1505 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1506 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1507 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1508 groups_per_flex;
ec05e868 1509 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1510 sizeof(struct flex_groups), GFP_KERNEL);
1511 if (sbi->s_flex_groups == NULL) {
ec05e868
LZ		 1512 printk(KERN_ERR "EXT4-fs: not enough memory for "
1513 "%lu flex groups\n", flex_group_count);
772cb7c8
JS		 1514 goto failed;
1515 }
772cb7c8
JS		 1516
1517 gdp = ext4_get_group_desc(sb, 1, &bh);
1518 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1519
1520 for (i = 0; i < sbi->s_groups_count; i++) {
1521 gdp = ext4_get_group_desc(sb, i, &bh);
1522
1523 flex_group = ext4_flex_group(sbi, i);
1524 sbi->s_flex_groups[flex_group].free_inodes +=
1525 le16_to_cpu(gdp->bg_free_inodes_count);
1526 sbi->s_flex_groups[flex_group].free_blocks +=
1527 le16_to_cpu(gdp->bg_free_blocks_count);
1528 }
1529
1530 return 1;
1531failed:
1532 return 0;
1533}
1534
717d50e4
AD		 1535__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1536 struct ext4_group_desc *gdp)
1537{
1538 __u16 crc = 0;
1539
1540 if (sbi->s_es->s_feature_ro_compat &
1541 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1542 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1543 __le32 le_group = cpu_to_le32(block_group);
1544
1545 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1546 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1547 crc = crc16(crc, (__u8 *)gdp, offset);
1548 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1549 /* for checksum of struct ext4_group_desc do the rest...*/
1550 if ((sbi->s_es->s_feature_incompat &
1551 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1552 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1553 crc = crc16(crc, (__u8 *)gdp + offset,
1554 le16_to_cpu(sbi->s_es->s_desc_size) -
1555 offset);
1556 }
1557
1558 return cpu_to_le16(crc);
1559}
1560
1561int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1562 struct ext4_group_desc *gdp)
1563{
1564 if ((sbi->s_es->s_feature_ro_compat &
1565 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1566 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1567 return 0;
1568
1569 return 1;
1570}
1571
ac27a0ec 1572/* Called at mount-time, super-block is locked */
197cd65a 1573static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1574{
617ba13b
MC		 1575 struct ext4_sb_info *sbi = EXT4_SB(sb);
1576 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1577 ext4_fsblk_t last_block;
bd81d8ee
LV		 1578 ext4_fsblk_t block_bitmap;
1579 ext4_fsblk_t inode_bitmap;
1580 ext4_fsblk_t inode_table;
ce421581 1581 int flexbg_flag = 0;
fd2d4291 1582 ext4_group_t i;
ac27a0ec 1583
ce421581
JS		 1584 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1585 flexbg_flag = 1;
1586
af5bc92d 1587 ext4_debug("Checking group descriptors");
ac27a0ec 1588
197cd65a
AM		 1589 for (i = 0; i < sbi->s_groups_count; i++) {
1590 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1591
ce421581 1592 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1593 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1594 else
1595 last_block = first_block +
617ba13b 1596 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1597
8fadc143 1598 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1599 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0
JB		 1600 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1601 "Block bitmap for group %lu not in group "
1602 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1603 return 0;
1604 }
8fadc143 1605 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1606 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0
JB		 1607 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1608 "Inode bitmap for group %lu not in group "
1609 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1610 return 0;
1611 }
8fadc143 1612 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1613 if (inode_table < first_block ||
2b2d6d01 1614 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0
JB		 1615 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1616 "Inode table for group %lu not in group "
1617 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1618 return 0;
1619 }
b5f10eed 1620 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1621 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0
JB		 1622 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1623 "Checksum for group %lu failed (%u!=%u)\n",
1624 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1625 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c
LZ		 1626 if (!(sb->s_flags & MS_RDONLY)) {
1627 spin_unlock(sb_bgl_lock(sbi, i));
8a266467 1628 return 0;
7ee1ec4c 1629 }
717d50e4 1630 }
b5f10eed 1631 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1632 if (!flexbg_flag)
1633 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1634 }
1635
bd81d8ee 1636 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1637 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1638 return 1;
1639}
1640
617ba13b 1641/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1642 * the superblock) which were deleted from all directories, but held open by
1643 * a process at the time of a crash. We walk the list and try to delete these
1644 * inodes at recovery time (only with a read-write filesystem).
1645 *
1646 * In order to keep the orphan inode chain consistent during traversal (in
1647 * case of crash during recovery), we link each inode into the superblock
1648 * orphan list_head and handle it the same way as an inode deletion during
1649 * normal operation (which journals the operations for us).
1650 *
1651 * We only do an iget() and an iput() on each inode, which is very safe if we
1652 * accidentally point at an in-use or already deleted inode. The worst that
1653 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1654 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1655 * e2fsck was run on this filesystem, and it must have already done the orphan
1656 * inode cleanup for us, so we can safely abort without any further action.
1657 */
2b2d6d01
TT		 1658static void ext4_orphan_cleanup(struct super_block *sb,
1659 struct ext4_super_block *es)
ac27a0ec
DK		 1660{
1661 unsigned int s_flags = sb->s_flags;
1662 int nr_orphans = 0, nr_truncates = 0;
1663#ifdef CONFIG_QUOTA
1664 int i;
1665#endif
1666 if (!es->s_last_orphan) {
1667 jbd_debug(4, "no orphan inodes to clean up\n");
1668 return;
1669 }
1670
a8f48a95
ES		 1671 if (bdev_read_only(sb->s_bdev)) {
1672 printk(KERN_ERR "EXT4-fs: write access "
1673 "unavailable, skipping orphan cleanup.\n");
1674 return;
1675 }
1676
617ba13b 1677 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1678 if (es->s_last_orphan)
1679 jbd_debug(1, "Errors on filesystem, "
1680 "clearing orphan list.\n");
1681 es->s_last_orphan = 0;
1682 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1683 return;
1684 }
1685
1686 if (s_flags & MS_RDONLY) {
617ba13b 1687 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1688 sb->s_id);
1689 sb->s_flags &= ~MS_RDONLY;
1690 }
1691#ifdef CONFIG_QUOTA
1692 /* Needed for iput() to work correctly and not trash data */
1693 sb->s_flags |= MS_ACTIVE;
1694 /* Turn on quotas so that they are updated correctly */
1695 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1696 if (EXT4_SB(sb)->s_qf_names[i]) {
1697 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1698 if (ret < 0)
1699 printk(KERN_ERR
2c8be6b2 1700 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1701 "quota: error %d\n", ret);
1702 }
1703 }
1704#endif
1705
1706 while (es->s_last_orphan) {
1707 struct inode *inode;
1708
97bd42b9
JB		 1709 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1710 if (IS_ERR(inode)) {
ac27a0ec
DK		 1711 es->s_last_orphan = 0;
1712 break;
1713 }
1714
617ba13b 1715 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1716 DQUOT_INIT(inode);
1717 if (inode->i_nlink) {
1718 printk(KERN_DEBUG
e5f8eab8 1719 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1720 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1721 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1722 inode->i_ino, inode->i_size);
617ba13b 1723 ext4_truncate(inode);
ac27a0ec
DK		 1724 nr_truncates++;
1725 } else {
1726 printk(KERN_DEBUG
1727 "%s: deleting unreferenced inode %lu\n",
46e665e9 1728 __func__, inode->i_ino);
ac27a0ec
DK		 1729 jbd_debug(2, "deleting unreferenced inode %lu\n",
1730 inode->i_ino);
1731 nr_orphans++;
1732 }
1733 iput(inode); /* The delete magic happens here! */
1734 }
1735
2b2d6d01 1736#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1737
1738 if (nr_orphans)
617ba13b 1739 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1740 sb->s_id, PLURAL(nr_orphans));
1741 if (nr_truncates)
617ba13b 1742 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1743 sb->s_id, PLURAL(nr_truncates));
1744#ifdef CONFIG_QUOTA
1745 /* Turn quotas off */
1746 for (i = 0; i < MAXQUOTAS; i++) {
1747 if (sb_dqopt(sb)->files[i])
6f28e087 1748 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1749 }
1750#endif
1751 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1752}
cd2291a4
ES		 1753/*
1754 * Maximal extent format file size.
1755 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1756 * extent format containers, within a sector_t, and within i_blocks
1757 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1758 * so that won't be a limiting factor.
1759 *
1760 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1761 */
1762static loff_t ext4_max_size(int blkbits)
1763{
1764 loff_t res;
1765 loff_t upper_limit = MAX_LFS_FILESIZE;
1766
1767 /* small i_blocks in vfs inode? */
1768 if (sizeof(blkcnt_t) < sizeof(u64)) {
1769 /*
1770 * CONFIG_LSF is not enabled implies the inode
1771 * i_block represent total blocks in 512 bytes
1772 * 32 == size of vfs inode i_blocks * 8
1773 */
1774 upper_limit = (1LL << 32) - 1;
1775
1776 /* total blocks in file system block size */
1777 upper_limit >>= (blkbits - 9);
1778 upper_limit <<= blkbits;
1779 }
1780
1781 /* 32-bit extent-start container, ee_block */
1782 res = 1LL << 32;
1783 res <<= blkbits;
1784 res -= 1;
1785
1786 /* Sanity check against vm- & vfs- imposed limits */
1787 if (res > upper_limit)
1788 res = upper_limit;
1789
1790 return res;
1791}
ac27a0ec 1792
ac27a0ec 1793/*
cd2291a4 1794 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1795 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1796 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1797 */
cd2291a4 1798static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1799{
617ba13b 1800 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1801 int meta_blocks;
1802 loff_t upper_limit;
1803 /* This is calculated to be the largest file size for a
cd2291a4 1804 * dense, bitmapped file such that the total number of
ac27a0ec 1805 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1806 * does not exceed 2^48 -1
1807 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1808 * total number of 512 bytes blocks of the file
1809 */
1810
1811 if (sizeof(blkcnt_t) < sizeof(u64)) {
1812 /*
1813 * CONFIG_LSF is not enabled implies the inode
1814 * i_block represent total blocks in 512 bytes
1815 * 32 == size of vfs inode i_blocks * 8
1816 */
1817 upper_limit = (1LL << 32) - 1;
1818
1819 /* total blocks in file system block size */
1820 upper_limit >>= (bits - 9);
1821
1822 } else {
8180a562
AK		 1823 /*
1824 * We use 48 bit ext4_inode i_blocks
1825 * With EXT4_HUGE_FILE_FL set the i_blocks
1826 * represent total number of blocks in
1827 * file system block size
1828 */
0fc1b451
AK		 1829 upper_limit = (1LL << 48) - 1;
1830
0fc1b451
AK		 1831 }
1832
1833 /* indirect blocks */
1834 meta_blocks = 1;
1835 /* double indirect blocks */
1836 meta_blocks += 1 + (1LL << (bits-2));
1837 /* tripple indirect blocks */
1838 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1839
1840 upper_limit -= meta_blocks;
1841 upper_limit <<= bits;
ac27a0ec
DK		 1842
1843 res += 1LL << (bits-2);
1844 res += 1LL << (2*(bits-2));
1845 res += 1LL << (3*(bits-2));
1846 res <<= bits;
1847 if (res > upper_limit)
1848 res = upper_limit;
0fc1b451
AK		 1849
1850 if (res > MAX_LFS_FILESIZE)
1851 res = MAX_LFS_FILESIZE;
1852
ac27a0ec
DK		 1853 return res;
1854}
1855
617ba13b 1856static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1857 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1858{
617ba13b 1859 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1860 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1861 int has_super = 0;
1862
1863 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1864
617ba13b 1865 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1866 nr < first_meta_bg)
70bbb3e0 1867 return logical_sb_block + nr + 1;
ac27a0ec 1868 bg = sbi->s_desc_per_block * nr;
617ba13b 1869 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1870 has_super = 1;
617ba13b 1871 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1872}
1873
c9de560d
AT		 1874/**
1875 * ext4_get_stripe_size: Get the stripe size.
1876 * @sbi: In memory super block info
1877 *
1878 * If we have specified it via mount option, then
1879 * use the mount option value. If the value specified at mount time is
1880 * greater than the blocks per group use the super block value.
1881 * If the super block value is greater than blocks per group return 0.
1882 * Allocator needs it be less than blocks per group.
1883 *
1884 */
1885static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1886{
1887 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1888 unsigned long stripe_width =
1889 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1890
1891 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1892 return sbi->s_stripe;
1893
1894 if (stripe_width <= sbi->s_blocks_per_group)
1895 return stripe_width;
1896
1897 if (stride <= sbi->s_blocks_per_group)
1898 return stride;
1899
1900 return 0;
1901}
ac27a0ec 1902
2b2d6d01 1903static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 1904 __releases(kernel_lock)
1905 __acquires(kernel_lock)
1d03ec98 1906
ac27a0ec 1907{
2b2d6d01 1908 struct buffer_head *bh;
617ba13b
MC		 1909 struct ext4_super_block *es = NULL;
1910 struct ext4_sb_info *sbi;
1911 ext4_fsblk_t block;
1912 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1913 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1914 unsigned long offset = 0;
1915 unsigned int journal_inum = 0;
1916 unsigned long journal_devnum = 0;
1917 unsigned long def_mount_opts;
1918 struct inode *root;
1d1fe1ee 1919 int ret = -EINVAL;
ac27a0ec 1920 int blocksize;
ac27a0ec
DK		 1921 int db_count;
1922 int i;
1923 int needs_recovery;
1924 __le32 features;
bd81d8ee 1925 __u64 blocks_count;
833f4077 1926 int err;
ac27a0ec
DK		 1927
1928 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1929 if (!sbi)
1930 return -ENOMEM;
1931 sb->s_fs_info = sbi;
1932 sbi->s_mount_opt = 0;
617ba13b
MC		 1933 sbi->s_resuid = EXT4_DEF_RESUID;
1934 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1935 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1936
1937 unlock_kernel();
1938
617ba13b 1939 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1940 if (!blocksize) {
617ba13b 1941 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1942 goto out_fail;
1943 }
1944
1945 /*
617ba13b 1946 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1947 * block sizes. We need to calculate the offset from buffer start.
1948 */
617ba13b 1949 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1950 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1951 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1952 } else {
70bbb3e0 1953 logical_sb_block = sb_block;
ac27a0ec
DK		 1954 }
1955
70bbb3e0 1956 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 1957 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1958 goto out_fail;
1959 }
1960 /*
1961 * Note: s_es must be initialized as soon as possible because
617ba13b 1962 * some ext4 macro-instructions depend on its value
ac27a0ec 1963 */
617ba13b 1964 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1965 sbi->s_es = es;
1966 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1967 if (sb->s_magic != EXT4_SUPER_MAGIC)
1968 goto cantfind_ext4;
ac27a0ec
DK		 1969
1970 /* Set defaults before we parse the mount options */
1971 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1972 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1973 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1974 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1975 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1976 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1977 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1978#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1979 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1980 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1981#endif
1982#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1983 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1984 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1985#endif
617ba13b
MC		 1986 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1987 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1988 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1989 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1990 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1991 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1992
1993 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1994 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1995 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1996 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 1997 else
1998 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1999
2000 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2001 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2002
2003 set_opt(sbi->s_mount_opt, RESERVATION);
571640ca 2004 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2005
1e2462f9
MC		 2006 /*
2007 * turn on extents feature by default in ext4 filesystem
e4079a11
ES		 2008 * only if feature flag already set by mkfs or tune2fs.
2009 * Use -o noextents to turn it off
1e2462f9 2010 */
e4079a11
ES		 2011 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2012 set_opt(sbi->s_mount_opt, EXTENTS);
2013 else
2014 ext4_warning(sb, __func__,
2015 "extents feature not enabled on this filesystem, "
2016 "use tune2fs.\n");
3dbd0ede 2017 /*
e4079a11
ES		 2018 * turn on mballoc code by default in ext4 filesystem
2019 * Use -o nomballoc to turn it off
3dbd0ede
AK		 2020 */
2021 set_opt(sbi->s_mount_opt, MBALLOC);
1e2462f9 2022
dd919b98
AK		 2023 /*
2024 * enable delayed allocation by default
2025 * Use -o nodelalloc to turn it off
2026 */
2027 set_opt(sbi->s_mount_opt, DELALLOC);
2028
2029
2b2d6d01
TT		 2030 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2031 NULL, 0))
ac27a0ec
DK		 2032 goto failed_mount;
2033
2034 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2035 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2036
617ba13b
MC		 2037 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2038 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2039 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2040 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2041 printk(KERN_WARNING
617ba13b 2042 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2043 "running e2fsck is recommended\n");
469108ff
TT		 2044
2045 /*
2046 * Since ext4 is still considered development code, we require
2047 * that the TEST_FILESYS flag in s->flags be set.
2048 */
2049 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2050 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2051 "OK to use with test code.\n", sb->s_id);
2052 goto failed_mount;
2053 }
2054
ac27a0ec
DK		 2055 /*
2056 * Check feature flags regardless of the revision level, since we
2057 * previously didn't change the revision level when setting the flags,
2058 * so there is a chance incompat flags are set on a rev 0 filesystem.
2059 */
617ba13b 2060 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2061 if (features) {
617ba13b 2062 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 2063 "unsupported optional features (%x).\n",
2064 sb->s_id, le32_to_cpu(features));
2065 goto failed_mount;
2066 }
617ba13b 2067 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2068 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2069 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 2070 "unsupported optional features (%x).\n",
2071 sb->s_id, le32_to_cpu(features));
2072 goto failed_mount;
2073 }
0fc1b451
AK		 2074 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2075 /*
2076 * Large file size enabled file system can only be
2077 * mount if kernel is build with CONFIG_LSF
2078 */
2079 if (sizeof(root->i_blocks) < sizeof(u64) &&
2080 !(sb->s_flags & MS_RDONLY)) {
2081 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2082 "files cannot be mounted read-write "
2083 "without CONFIG_LSF.\n", sb->s_id);
2084 goto failed_mount;
2085 }
2086 }
ac27a0ec
DK		 2087 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2088
617ba13b
MC		 2089 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2090 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2091 printk(KERN_ERR
617ba13b 2092 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2093 blocksize, sb->s_id);
2094 goto failed_mount;
2095 }
2096
ac27a0ec 2097 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2098
2099 /* Validate the filesystem blocksize */
2100 if (!sb_set_blocksize(sb, blocksize)) {
2101 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2102 blocksize);
ac27a0ec
DK		 2103 goto failed_mount;
2104 }
2105
2b2d6d01 2106 brelse(bh);
70bbb3e0
AM		 2107 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2108 offset = do_div(logical_sb_block, blocksize);
2109 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2110 if (!bh) {
2111 printk(KERN_ERR
617ba13b 2112 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2113 goto failed_mount;
2114 }
617ba13b 2115 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2116 sbi->s_es = es;
617ba13b 2117 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2118 printk(KERN_ERR
2119 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2120 goto failed_mount;
2121 }
2122 }
2123
e2b46574 2124 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 2125 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 2126
617ba13b
MC		 2127 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2128 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2129 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2130 } else {
2131 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2132 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2133 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2134 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2135 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2136 printk(KERN_ERR
2137 "EXT4-fs: unsupported inode size: %d\n",
2138 sbi->s_inode_size);
ac27a0ec
DK		 2139 goto failed_mount;
2140 }
ef7f3835
KS		 2141 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2142 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2143 }
0d1ee42f
AR		 2144 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2145 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2146 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2147 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2148 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2149 printk(KERN_ERR
8fadc143 2150 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2151 sbi->s_desc_size);
2152 goto failed_mount;
2153 }
2154 } else
2155 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2156 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2157 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2158 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2159 goto cantfind_ext4;
2160 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2161 if (sbi->s_inodes_per_block == 0)
617ba13b 2162 goto cantfind_ext4;
ac27a0ec
DK		 2163 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2164 sbi->s_inodes_per_block;
0d1ee42f 2165 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2166 sbi->s_sbh = bh;
2167 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2168 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2169 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2170 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2171 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2172 sbi->s_def_hash_version = es->s_def_hash_version;
2173
2174 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2175 printk(KERN_ERR
2176 "EXT4-fs: #blocks per group too big: %lu\n",
2177 sbi->s_blocks_per_group);
ac27a0ec
DK		 2178 goto failed_mount;
2179 }
ac27a0ec 2180 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2181 printk(KERN_ERR
2182 "EXT4-fs: #inodes per group too big: %lu\n",
2183 sbi->s_inodes_per_group);
ac27a0ec
DK		 2184 goto failed_mount;
2185 }
2186
bd81d8ee 2187 if (ext4_blocks_count(es) >
ac27a0ec 2188 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2189 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2190 " too large to mount safely\n", sb->s_id);
2191 if (sizeof(sector_t) < 8)
617ba13b 2192 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2193 "enabled\n");
2194 goto failed_mount;
2195 }
2196
617ba13b
MC		 2197 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2198 goto cantfind_ext4;
e7c95593
ES		 2199
2200 /* ensure blocks_count calculation below doesn't sign-extend */
2201 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2202 le32_to_cpu(es->s_first_data_block) + 1) {
2203 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2204 "first data block %u, blocks per group %lu\n",
2205 ext4_blocks_count(es),
2206 le32_to_cpu(es->s_first_data_block),
2207 EXT4_BLOCKS_PER_GROUP(sb));
2208 goto failed_mount;
2209 }
bd81d8ee
LV		 2210 blocks_count = (ext4_blocks_count(es) -
2211 le32_to_cpu(es->s_first_data_block) +
2212 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2213 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2214 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2215 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2216 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2217 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2218 GFP_KERNEL);
2219 if (sbi->s_group_desc == NULL) {
2b2d6d01 2220 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2221 goto failed_mount;
2222 }
2223
2224 bgl_lock_init(&sbi->s_blockgroup_lock);
2225
2226 for (i = 0; i < db_count; i++) {
70bbb3e0 2227 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2228 sbi->s_group_desc[i] = sb_bread(sb, block);
2229 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2230 printk(KERN_ERR "EXT4-fs: "
2231 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2232 db_count = i;
2233 goto failed_mount2;
2234 }
2235 }
2b2d6d01 2236 if (!ext4_check_descriptors(sb)) {
617ba13b 2237 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2238 goto failed_mount2;
2239 }
772cb7c8
JS		 2240 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2241 if (!ext4_fill_flex_info(sb)) {
2242 printk(KERN_ERR
2243 "EXT4-fs: unable to initialize "
2244 "flex_bg meta info!\n");
2245 goto failed_mount2;
2246 }
2247
ac27a0ec
DK		 2248 sbi->s_gdb_count = db_count;
2249 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2250 spin_lock_init(&sbi->s_next_gen_lock);
2251
833f4077
PZ		 2252 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2253 ext4_count_free_blocks(sb));
2254 if (!err) {
2255 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2256 ext4_count_free_inodes(sb));
2257 }
2258 if (!err) {
2259 err = percpu_counter_init(&sbi->s_dirs_counter,
2260 ext4_count_dirs(sb));
2261 }
6bc6e63f
AK		 2262 if (!err) {
2263 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2264 }
833f4077
PZ		 2265 if (err) {
2266 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2267 goto failed_mount3;
2268 }
ac27a0ec
DK		 2269
2270 /* per fileystem reservation list head & lock */
2271 spin_lock_init(&sbi->s_rsv_window_lock);
2272 sbi->s_rsv_window_root = RB_ROOT;
2273 /* Add a single, static dummy reservation to the start of the
2274 * reservation window list --- it gives us a placeholder for
2275 * append-at-start-of-list which makes the allocation logic
2276 * _much_ simpler. */
617ba13b
MC		 2277 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2278 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2279 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2280 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2281 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2282
c9de560d
AT		 2283 sbi->s_stripe = ext4_get_stripe_size(sbi);
2284
ac27a0ec
DK		 2285 /*
2286 * set up enough so that it can read an inode
2287 */
617ba13b
MC		 2288 sb->s_op = &ext4_sops;
2289 sb->s_export_op = &ext4_export_ops;
2290 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2291#ifdef CONFIG_QUOTA
617ba13b
MC		 2292 sb->s_qcop = &ext4_qctl_operations;
2293 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2294#endif
2295 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2296
2297 sb->s_root = NULL;
2298
2299 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2300 EXT4_HAS_INCOMPAT_FEATURE(sb,
2301 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2302
2303 /*
2304 * The first inode we look at is the journal inode. Don't try
2305 * root first: it may be modified in the journal!
2306 */
2307 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2308 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2309 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2310 goto failed_mount3;
624080ed
TT		 2311 if (!(sb->s_flags & MS_RDONLY) &&
2312 EXT4_SB(sb)->s_journal->j_failed_commit) {
2313 printk(KERN_CRIT "EXT4-fs error (device %s): "
2314 "ext4_fill_super: Journal transaction "
2b2d6d01 2315 "%u is corrupt\n", sb->s_id,
624080ed 2316 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2317 if (test_opt(sb, ERRORS_RO)) {
2318 printk(KERN_CRIT
2319 "Mounting filesystem read-only\n");
624080ed
TT		 2320 sb->s_flags |= MS_RDONLY;
2321 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2322 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2323 }
2324 if (test_opt(sb, ERRORS_PANIC)) {
2325 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2326 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2327 ext4_commit_super(sb, es, 1);
2328 printk(KERN_CRIT
2329 "EXT4-fs (device %s): mount failed\n",
2330 sb->s_id);
2331 goto failed_mount4;
2332 }
2333 }
ac27a0ec 2334 } else if (journal_inum) {
617ba13b 2335 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2336 goto failed_mount3;
2337 } else {
2338 if (!silent)
2b2d6d01
TT		 2339 printk(KERN_ERR
2340 "ext4: No journal on filesystem on %s\n",
2341 sb->s_id);
ac27a0ec
DK		 2342 goto failed_mount3;
2343 }
2344
eb40a09c
JS		 2345 if (ext4_blocks_count(es) > 0xffffffffULL &&
2346 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2347 JBD2_FEATURE_INCOMPAT_64BIT)) {
2348 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2349 goto failed_mount4;
2350 }
2351
818d276c
GS		 2352 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2353 jbd2_journal_set_features(sbi->s_journal,
2354 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2355 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2356 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2357 jbd2_journal_set_features(sbi->s_journal,
2358 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2359 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2360 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2361 } else {
2362 jbd2_journal_clear_features(sbi->s_journal,
2363 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2364 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2365 }
2366
ac27a0ec
DK		 2367 /* We have now updated the journal if required, so we can
2368 * validate the data journaling mode. */
2369 switch (test_opt(sb, DATA_FLAGS)) {
2370 case 0:
2371 /* No mode set, assume a default based on the journal
63f57933
AM		 2372 * capabilities: ORDERED_DATA if the journal can
2373 * cope, else JOURNAL_DATA
2374 */
dab291af
MC		 2375 if (jbd2_journal_check_available_features
2376 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2377 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2378 else
2379 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2380 break;
2381
617ba13b
MC		 2382 case EXT4_MOUNT_ORDERED_DATA:
2383 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2384 if (!jbd2_journal_check_available_features
2385 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2386 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2387 "requested data journaling mode\n");
2388 goto failed_mount4;
2389 }
2390 default:
2391 break;
2392 }
2393
2394 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2395 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2396 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2397 "its supported only with writeback mode\n");
2398 clear_opt(sbi->s_mount_opt, NOBH);
2399 }
2400 }
2401 /*
dab291af 2402 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2403 * so we can safely mount the rest of the filesystem now.
2404 */
2405
1d1fe1ee
DH		 2406 root = ext4_iget(sb, EXT4_ROOT_INO);
2407 if (IS_ERR(root)) {
617ba13b 2408 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2409 ret = PTR_ERR(root);
ac27a0ec
DK		 2410 goto failed_mount4;
2411 }
2412 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2413 iput(root);
617ba13b 2414 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2415 goto failed_mount4;
2416 }
1d1fe1ee
DH		 2417 sb->s_root = d_alloc_root(root);
2418 if (!sb->s_root) {
2419 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2420 iput(root);
2421 ret = -ENOMEM;
2422 goto failed_mount4;
2423 }
ac27a0ec 2424
2b2d6d01 2425 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2426
2427 /* determine the minimum size of new large inodes, if present */
2428 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2429 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2430 EXT4_GOOD_OLD_INODE_SIZE;
2431 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2432 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2433 if (sbi->s_want_extra_isize <
2434 le16_to_cpu(es->s_want_extra_isize))
2435 sbi->s_want_extra_isize =
2436 le16_to_cpu(es->s_want_extra_isize);
2437 if (sbi->s_want_extra_isize <
2438 le16_to_cpu(es->s_min_extra_isize))
2439 sbi->s_want_extra_isize =
2440 le16_to_cpu(es->s_min_extra_isize);
2441 }
2442 }
2443 /* Check if enough inode space is available */
2444 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2445 sbi->s_inode_size) {
2446 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2447 EXT4_GOOD_OLD_INODE_SIZE;
2448 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2449 "available.\n");
2450 }
2451
ac27a0ec
DK		 2452 /*
2453 * akpm: core read_super() calls in here with the superblock locked.
2454 * That deadlocks, because orphan cleanup needs to lock the superblock
2455 * in numerous places. Here we just pop the lock - it's relatively
2456 * harmless, because we are now ready to accept write_super() requests,
2457 * and aviro says that's the only reason for hanging onto the
2458 * superblock lock.
2459 */
617ba13b
MC		 2460 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2461 ext4_orphan_cleanup(sb, es);
2462 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2463 if (needs_recovery)
2b2d6d01 2464 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
617ba13b 2465 ext4_mark_recovery_complete(sb, es);
2b2d6d01
TT		 2466 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2467 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2468 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2469 "writeback");
ac27a0ec 2470
dd919b98
AK		 2471 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2472 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2473 "requested data journaling mode\n");
2474 clear_opt(sbi->s_mount_opt, DELALLOC);
2475 } else if (test_opt(sb, DELALLOC))
2476 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2477
a86c6181 2478 ext4_ext_init(sb);
c9de560d 2479 ext4_mb_init(sb, needs_recovery);
a86c6181 2480
ac27a0ec
DK		 2481 lock_kernel();
2482 return 0;
2483
617ba13b 2484cantfind_ext4:
ac27a0ec 2485 if (!silent)
617ba13b 2486 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2487 sb->s_id);
2488 goto failed_mount;
2489
2490failed_mount4:
dab291af 2491 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 2492 sbi->s_journal = NULL;
ac27a0ec
DK		 2493failed_mount3:
2494 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2495 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2496 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2497 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2498failed_mount2:
2499 for (i = 0; i < db_count; i++)
2500 brelse(sbi->s_group_desc[i]);
2501 kfree(sbi->s_group_desc);
2502failed_mount:
2503#ifdef CONFIG_QUOTA
2504 for (i = 0; i < MAXQUOTAS; i++)
2505 kfree(sbi->s_qf_names[i]);
2506#endif
617ba13b 2507 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2508 brelse(bh);
2509out_fail:
2510 sb->s_fs_info = NULL;
2511 kfree(sbi);
2512 lock_kernel();
1d1fe1ee 2513 return ret;
ac27a0ec
DK		 2514}
2515
2516/*
2517 * Setup any per-fs journal parameters now. We'll do this both on
2518 * initial mount, once the journal has been initialised but before we've
2519 * done any recovery; and again on any subsequent remount.
2520 */
617ba13b 2521static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2522{
617ba13b 2523 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2524
2525 if (sbi->s_commit_interval)
2526 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2527 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2528 * interval here, but for now we'll just fall back to the jbd
2529 * default. */
2530
2531 spin_lock(&journal->j_state_lock);
2532 if (test_opt(sb, BARRIER))
dab291af 2533 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2534 else
dab291af 2535 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2536 spin_unlock(&journal->j_state_lock);
2537}
2538
617ba13b 2539static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2540 unsigned int journal_inum)
2541{
2542 struct inode *journal_inode;
2543 journal_t *journal;
2544
2545 /* First, test for the existence of a valid inode on disk. Bad
2546 * things happen if we iget() an unused inode, as the subsequent
2547 * iput() will try to delete it. */
2548
1d1fe1ee
DH		 2549 journal_inode = ext4_iget(sb, journal_inum);
2550 if (IS_ERR(journal_inode)) {
617ba13b 2551 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2552 return NULL;
2553 }
2554 if (!journal_inode->i_nlink) {
2555 make_bad_inode(journal_inode);
2556 iput(journal_inode);
617ba13b 2557 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2558 return NULL;
2559 }
2560
e5f8eab8 2561 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2562 journal_inode, journal_inode->i_size);
1d1fe1ee 2563 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2564 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2565 iput(journal_inode);
2566 return NULL;
2567 }
2568
dab291af 2569 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2570 if (!journal) {
617ba13b 2571 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2572 iput(journal_inode);
2573 return NULL;
2574 }
2575 journal->j_private = sb;
617ba13b 2576 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2577 return journal;
2578}
2579
617ba13b 2580static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2581 dev_t j_dev)
2582{
2b2d6d01 2583 struct buffer_head *bh;
ac27a0ec 2584 journal_t *journal;
617ba13b
MC		 2585 ext4_fsblk_t start;
2586 ext4_fsblk_t len;
ac27a0ec 2587 int hblock, blocksize;
617ba13b 2588 ext4_fsblk_t sb_block;
ac27a0ec 2589 unsigned long offset;
2b2d6d01 2590 struct ext4_super_block *es;
ac27a0ec
DK		 2591 struct block_device *bdev;
2592
617ba13b 2593 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2594 if (bdev == NULL)
2595 return NULL;
2596
2597 if (bd_claim(bdev, sb)) {
2598 printk(KERN_ERR
8c55e204 2599 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2600 blkdev_put(bdev);
2601 return NULL;
2602 }
2603
2604 blocksize = sb->s_blocksize;
2605 hblock = bdev_hardsect_size(bdev);
2606 if (blocksize < hblock) {
2607 printk(KERN_ERR
617ba13b 2608 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2609 goto out_bdev;
2610 }
2611
617ba13b
MC		 2612 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2613 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2614 set_blocksize(bdev, blocksize);
2615 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2616 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2617 "external journal\n");
2618 goto out_bdev;
2619 }
2620
617ba13b
MC		 2621 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2622 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2623 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2624 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2625 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2626 "bad superblock\n");
2627 brelse(bh);
2628 goto out_bdev;
2629 }
2630
617ba13b
MC		 2631 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2632 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2633 brelse(bh);
2634 goto out_bdev;
2635 }
2636
bd81d8ee 2637 len = ext4_blocks_count(es);
ac27a0ec
DK		 2638 start = sb_block + 1;
2639 brelse(bh); /* we're done with the superblock */
2640
dab291af 2641 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2642 start, len, blocksize);
2643 if (!journal) {
617ba13b 2644 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2645 goto out_bdev;
2646 }
2647 journal->j_private = sb;
2648 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2649 wait_on_buffer(journal->j_sb_buffer);
2650 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2651 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2652 goto out_journal;
2653 }
2654 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2655 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2656 "user (unsupported) - %d\n",
2657 be32_to_cpu(journal->j_superblock->s_nr_users));
2658 goto out_journal;
2659 }
617ba13b
MC		 2660 EXT4_SB(sb)->journal_bdev = bdev;
2661 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2662 return journal;
2663out_journal:
dab291af 2664 jbd2_journal_destroy(journal);
ac27a0ec 2665out_bdev:
617ba13b 2666 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2667 return NULL;
2668}
2669
617ba13b
MC		 2670static int ext4_load_journal(struct super_block *sb,
2671 struct ext4_super_block *es,
ac27a0ec
DK		 2672 unsigned long journal_devnum)
2673{
2674 journal_t *journal;
2675 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2676 dev_t journal_dev;
2677 int err = 0;
2678 int really_read_only;
2679
2680 if (journal_devnum &&
2681 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2682 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2683 "numbers have changed\n");
2684 journal_dev = new_decode_dev(journal_devnum);
2685 } else
2686 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2687
2688 really_read_only = bdev_read_only(sb->s_bdev);
2689
2690 /*
2691 * Are we loading a blank journal or performing recovery after a
2692 * crash? For recovery, we need to check in advance whether we
2693 * can get read-write access to the device.
2694 */
2695
617ba13b 2696 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2697 if (sb->s_flags & MS_RDONLY) {
617ba13b 2698 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2699 "required on readonly filesystem.\n");
2700 if (really_read_only) {
617ba13b 2701 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2702 "unavailable, cannot proceed.\n");
2703 return -EROFS;
2704 }
2b2d6d01
TT		 2705 printk(KERN_INFO "EXT4-fs: write access will "
2706 "be enabled during recovery.\n");
ac27a0ec
DK		 2707 }
2708 }
2709
2710 if (journal_inum && journal_dev) {
617ba13b 2711 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2712 "and inode journals!\n");
2713 return -EINVAL;
2714 }
2715
2716 if (journal_inum) {
617ba13b 2717 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2718 return -EINVAL;
2719 } else {
617ba13b 2720 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2721 return -EINVAL;
2722 }
2723
4776004f
TT		 2724 if (journal->j_flags & JBD2_BARRIER)
2725 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2726 else
2727 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2728
ac27a0ec 2729 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2730 err = jbd2_journal_update_format(journal);
ac27a0ec 2731 if (err) {
617ba13b 2732 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2733 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2734 return err;
2735 }
2736 }
2737
617ba13b 2738 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2739 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2740 if (!err)
dab291af 2741 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2742
2743 if (err) {
617ba13b 2744 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2745 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2746 return err;
2747 }
2748
617ba13b
MC		 2749 EXT4_SB(sb)->s_journal = journal;
2750 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2751
2752 if (journal_devnum &&
2753 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2754 es->s_journal_dev = cpu_to_le32(journal_devnum);
2755 sb->s_dirt = 1;
2756
2757 /* Make sure we flush the recovery flag to disk. */
617ba13b 2758 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2759 }
2760
2761 return 0;
2762}
2763
2b2d6d01
TT		 2764static int ext4_create_journal(struct super_block *sb,
2765 struct ext4_super_block *es,
ac27a0ec
DK		 2766 unsigned int journal_inum)
2767{
2768 journal_t *journal;
6c675bd4 2769 int err;
ac27a0ec
DK		 2770
2771 if (sb->s_flags & MS_RDONLY) {
617ba13b 2772 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2773 "create journal.\n");
2774 return -EROFS;
2775 }
2776
6c675bd4
BP		 2777 journal = ext4_get_journal(sb, journal_inum);
2778 if (!journal)
ac27a0ec
DK		 2779 return -EINVAL;
2780
617ba13b 2781 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2782 journal_inum);
2783
6c675bd4
BP		 2784 err = jbd2_journal_create(journal);
2785 if (err) {
617ba13b 2786 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2787 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2788 return -EIO;
2789 }
2790
617ba13b 2791 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2792
617ba13b
MC		 2793 ext4_update_dynamic_rev(sb);
2794 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2795 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2796
2797 es->s_journal_inum = cpu_to_le32(journal_inum);
2798 sb->s_dirt = 1;
2799
2800 /* Make sure we flush the recovery flag to disk. */
617ba13b 2801 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2802
2803 return 0;
2804}
2805
2b2d6d01
TT		 2806static void ext4_commit_super(struct super_block *sb,
2807 struct ext4_super_block *es, int sync)
ac27a0ec 2808{
617ba13b 2809 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2810
2811 if (!sbh)
2812 return;
914258bf
TT		 2813 if (buffer_write_io_error(sbh)) {
2814 /*
2815 * Oh, dear. A previous attempt to write the
2816 * superblock failed. This could happen because the
2817 * USB device was yanked out. Or it could happen to
2818 * be a transient write error and maybe the block will
2819 * be remapped. Nothing we can do but to retry the
2820 * write and hope for the best.
2821 */
2822 printk(KERN_ERR "ext4: previous I/O error to "
2823 "superblock detected for %s.\n", sb->s_id);
2824 clear_buffer_write_io_error(sbh);
2825 set_buffer_uptodate(sbh);
2826 }
ac27a0ec 2827 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2828 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2829 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2830 BUFFER_TRACE(sbh, "marking dirty");
2831 mark_buffer_dirty(sbh);
914258bf 2832 if (sync) {
ac27a0ec 2833 sync_dirty_buffer(sbh);
914258bf
TT		 2834 if (buffer_write_io_error(sbh)) {
2835 printk(KERN_ERR "ext4: I/O error while writing "
2836 "superblock for %s.\n", sb->s_id);
2837 clear_buffer_write_io_error(sbh);
2838 set_buffer_uptodate(sbh);
2839 }
2840 }
ac27a0ec
DK		 2841}
2842
2843
2844/*
2845 * Have we just finished recovery? If so, and if we are mounting (or
2846 * remounting) the filesystem readonly, then we will end up with a
2847 * consistent fs on disk. Record that fact.
2848 */
2b2d6d01
TT		 2849static void ext4_mark_recovery_complete(struct super_block *sb,
2850 struct ext4_super_block *es)
ac27a0ec 2851{
617ba13b 2852 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2853
dab291af
MC		 2854 jbd2_journal_lock_updates(journal);
2855 jbd2_journal_flush(journal);
32c37730 2856 lock_super(sb);
617ba13b 2857 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2858 sb->s_flags & MS_RDONLY) {
617ba13b 2859 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2860 sb->s_dirt = 0;
617ba13b 2861 ext4_commit_super(sb, es, 1);
ac27a0ec 2862 }
32c37730 2863 unlock_super(sb);
dab291af 2864 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2865}
2866
2867/*
2868 * If we are mounting (or read-write remounting) a filesystem whose journal
2869 * has recorded an error from a previous lifetime, move that error to the
2870 * main filesystem now.
2871 */
2b2d6d01
TT		 2872static void ext4_clear_journal_err(struct super_block *sb,
2873 struct ext4_super_block *es)
ac27a0ec
DK		 2874{
2875 journal_t *journal;
2876 int j_errno;
2877 const char *errstr;
2878
617ba13b 2879 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2880
2881 /*
2882 * Now check for any error status which may have been recorded in the
617ba13b 2883 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2884 */
2885
dab291af 2886 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2887 if (j_errno) {
2888 char nbuf[16];
2889
617ba13b 2890 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 2891 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 2892 "from previous mount: %s", errstr);
46e665e9 2893 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 2894 "filesystem check.");
2895
617ba13b
MC		 2896 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2897 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 2898 ext4_commit_super(sb, es, 1);
ac27a0ec 2899
dab291af 2900 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2901 }
2902}
2903
2904/*
2905 * Force the running and committing transactions to commit,
2906 * and wait on the commit.
2907 */
617ba13b 2908int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2909{
2910 journal_t *journal;
2911 int ret;
2912
2913 if (sb->s_flags & MS_RDONLY)
2914 return 0;
2915
617ba13b 2916 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2917 sb->s_dirt = 0;
617ba13b 2918 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2919 return ret;
2920}
2921
2922/*
617ba13b 2923 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2924 * have to propagate any other updates to the superblock on disk at this
2925 * point. Just start an async writeback to get the buffers on their way
2926 * to the disk.
2927 *
2928 * This implicitly triggers the writebehind on sync().
2929 */
2930
2b2d6d01 2931static void ext4_write_super(struct super_block *sb)
ac27a0ec
DK		 2932{
2933 if (mutex_trylock(&sb->s_lock) != 0)
2934 BUG();
2935 sb->s_dirt = 0;
2936}
2937
617ba13b 2938static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2939{
2940 tid_t target;
2941
2942 sb->s_dirt = 0;
dab291af 2943 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2944 if (wait)
dab291af 2945 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2946 }
2947 return 0;
2948}
2949
2950/*
2951 * LVM calls this function before a (read-only) snapshot is created. This
2952 * gives us a chance to flush the journal completely and mark the fs clean.
2953 */
617ba13b 2954static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2955{
2956 sb->s_dirt = 0;
2957
2958 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2959 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2960
2961 /* Now we set up the journal barrier. */
dab291af
MC		 2962 jbd2_journal_lock_updates(journal);
2963 jbd2_journal_flush(journal);
ac27a0ec
DK		 2964
2965 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2966 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2967 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2968 }
2969}
2970
2971/*
2972 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2973 * flag here, even though the filesystem is not technically dirty yet.
2974 */
617ba13b 2975static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2976{
2977 if (!(sb->s_flags & MS_RDONLY)) {
2978 lock_super(sb);
2979 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2980 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2981 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2982 unlock_super(sb);
dab291af 2983 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2984 }
2985}
2986
2b2d6d01 2987static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 2988{
2b2d6d01 2989 struct ext4_super_block *es;
617ba13b
MC		 2990 struct ext4_sb_info *sbi = EXT4_SB(sb);
2991 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2992 unsigned long old_sb_flags;
617ba13b 2993 struct ext4_mount_options old_opts;
8a266467 2994 ext4_group_t g;
ac27a0ec
DK		 2995 int err;
2996#ifdef CONFIG_QUOTA
2997 int i;
2998#endif
2999
3000 /* Store the original options */
3001 old_sb_flags = sb->s_flags;
3002 old_opts.s_mount_opt = sbi->s_mount_opt;
3003 old_opts.s_resuid = sbi->s_resuid;
3004 old_opts.s_resgid = sbi->s_resgid;
3005 old_opts.s_commit_interval = sbi->s_commit_interval;
3006#ifdef CONFIG_QUOTA
3007 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3008 for (i = 0; i < MAXQUOTAS; i++)
3009 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3010#endif
3011
3012 /*
3013 * Allow the "check" option to be passed as a remount option.
3014 */
3015 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
3016 err = -EINVAL;
3017 goto restore_opts;
3018 }
3019
617ba13b 3020 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3021 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3022
3023 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3024 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3025
3026 es = sbi->s_es;
3027
617ba13b 3028 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 3029
3030 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3031 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3032 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3033 err = -EROFS;
3034 goto restore_opts;
3035 }
3036
3037 if (*flags & MS_RDONLY) {
3038 /*
3039 * First of all, the unconditional stuff we have to do
3040 * to disable replay of the journal when we next remount
3041 */
3042 sb->s_flags |= MS_RDONLY;
3043
3044 /*
3045 * OK, test if we are remounting a valid rw partition
3046 * readonly, and if so set the rdonly flag and then
3047 * mark the partition as valid again.
3048 */
617ba13b
MC		 3049 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3050 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3051 es->s_state = cpu_to_le16(sbi->s_mount_state);
3052
32c37730
JK		 3053 /*
3054 * We have to unlock super so that we can wait for
3055 * transactions.
3056 */
3057 unlock_super(sb);
617ba13b 3058 ext4_mark_recovery_complete(sb, es);
32c37730 3059 lock_super(sb);
ac27a0ec
DK		 3060 } else {
3061 __le32 ret;
617ba13b
MC		 3062 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3063 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3064 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 3065 "remount RDWR because of unsupported "
3066 "optional features (%x).\n",
3067 sb->s_id, le32_to_cpu(ret));
3068 err = -EROFS;
3069 goto restore_opts;
3070 }
ead6596b 3071
8a266467
TT		 3072 /*
3073 * Make sure the group descriptor checksums
3074 * are sane. If they aren't, refuse to
3075 * remount r/w.
3076 */
3077 for (g = 0; g < sbi->s_groups_count; g++) {
3078 struct ext4_group_desc *gdp =
3079 ext4_get_group_desc(sb, g, NULL);
3080
3081 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3082 printk(KERN_ERR
3083 "EXT4-fs: ext4_remount: "
3084 "Checksum for group %lu failed (%u!=%u)\n",
3085 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3086 le16_to_cpu(gdp->bg_checksum));
3087 err = -EINVAL;
3088 goto restore_opts;
3089 }
3090 }
3091
ead6596b
ES		 3092 /*
3093 * If we have an unprocessed orphan list hanging
3094 * around from a previously readonly bdev mount,
3095 * require a full umount/remount for now.
3096 */
3097 if (es->s_last_orphan) {
3098 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3099 "remount RDWR because of unprocessed "
3100 "orphan inode list. Please "
3101 "umount/remount instead.\n",
3102 sb->s_id);
3103 err = -EINVAL;
3104 goto restore_opts;
3105 }
3106
ac27a0ec
DK		 3107 /*
3108 * Mounting a RDONLY partition read-write, so reread
3109 * and store the current valid flag. (It may have
3110 * been changed by e2fsck since we originally mounted
3111 * the partition.)
3112 */
617ba13b 3113 ext4_clear_journal_err(sb, es);
ac27a0ec 3114 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3115 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3116 goto restore_opts;
2b2d6d01 3117 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3118 sb->s_flags &= ~MS_RDONLY;
3119 }
3120 }
3121#ifdef CONFIG_QUOTA
3122 /* Release old quota file names */
3123 for (i = 0; i < MAXQUOTAS; i++)
3124 if (old_opts.s_qf_names[i] &&
3125 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3126 kfree(old_opts.s_qf_names[i]);
3127#endif
3128 return 0;
3129restore_opts:
3130 sb->s_flags = old_sb_flags;
3131 sbi->s_mount_opt = old_opts.s_mount_opt;
3132 sbi->s_resuid = old_opts.s_resuid;
3133 sbi->s_resgid = old_opts.s_resgid;
3134 sbi->s_commit_interval = old_opts.s_commit_interval;
3135#ifdef CONFIG_QUOTA
3136 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3137 for (i = 0; i < MAXQUOTAS; i++) {
3138 if (sbi->s_qf_names[i] &&
3139 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3140 kfree(sbi->s_qf_names[i]);
3141 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3142 }
3143#endif
3144 return err;
3145}
3146
2b2d6d01 3147static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3148{
3149 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3150 struct ext4_sb_info *sbi = EXT4_SB(sb);
3151 struct ext4_super_block *es = sbi->s_es;
960cc398 3152 u64 fsid;
ac27a0ec 3153
5e70030d
BP		 3154 if (test_opt(sb, MINIX_DF)) {
3155 sbi->s_overhead_last = 0;
6bc9feff 3156 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3157 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3158 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3159 smp_rmb();
3160
3161 /*
5e70030d
BP		 3162 * Compute the overhead (FS structures). This is constant
3163 * for a given filesystem unless the number of block groups
3164 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3165 */
3166
3167 /*
3168 * All of the blocks before first_data_block are
3169 * overhead
3170 */
3171 overhead = le32_to_cpu(es->s_first_data_block);
3172
3173 /*
3174 * Add the overhead attributed to the superblock and
3175 * block group descriptors. If the sparse superblocks
3176 * feature is turned on, then not all groups have this.
3177 */
3178 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3179 overhead += ext4_bg_has_super(sb, i) +
3180 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3181 cond_resched();
3182 }
3183
3184 /*
3185 * Every block group has an inode bitmap, a block
3186 * bitmap, and an inode table.
3187 */
5e70030d
BP		 3188 overhead += ngroups * (2 + sbi->s_itb_per_group);
3189 sbi->s_overhead_last = overhead;
3190 smp_wmb();
6bc9feff 3191 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3192 }
3193
617ba13b 3194 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3195 buf->f_bsize = sb->s_blocksize;
5e70030d 3196 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3197 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3198 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3199 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3200 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3201 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3202 buf->f_bavail = 0;
3203 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3204 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3205 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3206 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3207 fsid = le64_to_cpup((void *)es->s_uuid) ^
3208 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3209 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3210 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3211 return 0;
3212}
3213
3214/* Helper function for writing quotas on sync - we need to start transaction before quota file
3215 * is locked for write. Otherwise the are possible deadlocks:
3216 * Process 1 Process 2
617ba13b 3217 * ext4_create() quota_sync()
dab291af 3218 * jbd2_journal_start() write_dquot()
ac27a0ec 3219 * DQUOT_INIT() down(dqio_mutex)
dab291af 3220 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3221 *
3222 */
3223
3224#ifdef CONFIG_QUOTA
3225
3226static inline struct inode *dquot_to_inode(struct dquot *dquot)
3227{
3228 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3229}
3230
617ba13b 3231static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3232{
3233 handle_t *handle;
3234 int ret, err;
3235
3236 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3237 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3238 if (IS_ERR(handle))
3239 return PTR_ERR(handle);
3240 ret = dquot_initialize(inode, type);
617ba13b 3241 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3242 if (!ret)
3243 ret = err;
3244 return ret;
3245}
3246
617ba13b 3247static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3248{
3249 handle_t *handle;
3250 int ret, err;
3251
3252 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3253 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2887df13
JK		 3254 if (IS_ERR(handle)) {
3255 /*
3256 * We call dquot_drop() anyway to at least release references
3257 * to quota structures so that umount does not hang.
3258 */
3259 dquot_drop(inode);
ac27a0ec 3260 return PTR_ERR(handle);
2887df13 3261 }
ac27a0ec 3262 ret = dquot_drop(inode);
617ba13b 3263 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3264 if (!ret)
3265 ret = err;
3266 return ret;
3267}
3268
617ba13b 3269static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3270{
3271 int ret, err;
3272 handle_t *handle;
3273 struct inode *inode;
3274
3275 inode = dquot_to_inode(dquot);
617ba13b
MC		 3276 handle = ext4_journal_start(inode,
3277 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3278 if (IS_ERR(handle))
3279 return PTR_ERR(handle);
3280 ret = dquot_commit(dquot);
617ba13b 3281 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3282 if (!ret)
3283 ret = err;
3284 return ret;
3285}
3286
617ba13b 3287static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3288{
3289 int ret, err;
3290 handle_t *handle;
3291
617ba13b
MC		 3292 handle = ext4_journal_start(dquot_to_inode(dquot),
3293 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3294 if (IS_ERR(handle))
3295 return PTR_ERR(handle);
3296 ret = dquot_acquire(dquot);
617ba13b 3297 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3298 if (!ret)
3299 ret = err;
3300 return ret;
3301}
3302
617ba13b 3303static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3304{
3305 int ret, err;
3306 handle_t *handle;
3307
617ba13b
MC		 3308 handle = ext4_journal_start(dquot_to_inode(dquot),
3309 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3310 if (IS_ERR(handle)) {
3311 /* Release dquot anyway to avoid endless cycle in dqput() */
3312 dquot_release(dquot);
ac27a0ec 3313 return PTR_ERR(handle);
9c3013e9 3314 }
ac27a0ec 3315 ret = dquot_release(dquot);
617ba13b 3316 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3317 if (!ret)
3318 ret = err;
3319 return ret;
3320}
3321
617ba13b 3322static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3323{
2c8be6b2 3324 /* Are we journaling quotas? */
617ba13b
MC		 3325 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3326 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3327 dquot_mark_dquot_dirty(dquot);
617ba13b 3328 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3329 } else {
3330 return dquot_mark_dquot_dirty(dquot);
3331 }
3332}
3333
617ba13b 3334static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3335{
3336 int ret, err;
3337 handle_t *handle;
3338
3339 /* Data block + inode block */
617ba13b 3340 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3341 if (IS_ERR(handle))
3342 return PTR_ERR(handle);
3343 ret = dquot_commit_info(sb, type);
617ba13b 3344 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3345 if (!ret)
3346 ret = err;
3347 return ret;
3348}
3349
3350/*
3351 * Turn on quotas during mount time - we need to find
3352 * the quota file and such...
3353 */
617ba13b 3354static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3355{
617ba13b
MC		 3356 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3357 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3358}
3359
3360/*
3361 * Standard function to be called on quota_on
3362 */
617ba13b 3363static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6f28e087 3364 char *path, int remount)
ac27a0ec
DK		 3365{
3366 int err;
3367 struct nameidata nd;
3368
3369 if (!test_opt(sb, QUOTA))
3370 return -EINVAL;
0623543b
JK		 3371 /* When remounting, no checks are needed and in fact, path is NULL */
3372 if (remount)
6f28e087 3373 return vfs_quota_on(sb, type, format_id, path, remount);
0623543b 3374
ac27a0ec
DK		 3375 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3376 if (err)
3377 return err;
0623543b 3378
ac27a0ec 3379 /* Quotafile not on the same filesystem? */
4ac91378 3380 if (nd.path.mnt->mnt_sb != sb) {
1d957f9b 3381 path_put(&nd.path);
ac27a0ec
DK		 3382 return -EXDEV;
3383 }
0623543b
JK		 3384 /* Journaling quota? */
3385 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3386 /* Quotafile not in fs root? */
0623543b
JK		 3387 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3388 printk(KERN_WARNING
3389 "EXT4-fs: Quota file not on filesystem root. "
3390 "Journaled quota will not work.\n");
2b2d6d01 3391 }
0623543b
JK		 3392
3393 /*
3394 * When we journal data on quota file, we have to flush journal to see
3395 * all updates to the file when we bypass pagecache...
3396 */
3397 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3398 /*
3399 * We don't need to lock updates but journal_flush() could
3400 * otherwise be livelocked...
3401 */
3402 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3403 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3404 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3405 }
3406
77e69dac 3407 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
1d957f9b 3408 path_put(&nd.path);
77e69dac 3409 return err;
ac27a0ec
DK		 3410}
3411
3412/* Read data from quotafile - avoid pagecache and such because we cannot afford
3413 * acquiring the locks... As quota files are never truncated and quota code
3414 * itself serializes the operations (and noone else should touch the files)
3415 * we don't have to be afraid of races */
617ba13b 3416static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3417 size_t len, loff_t off)
3418{
3419 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3420 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3421 int err = 0;
3422 int offset = off & (sb->s_blocksize - 1);
3423 int tocopy;
3424 size_t toread;
3425 struct buffer_head *bh;
3426 loff_t i_size = i_size_read(inode);
3427
3428 if (off > i_size)
3429 return 0;
3430 if (off+len > i_size)
3431 len = i_size-off;
3432 toread = len;
3433 while (toread > 0) {
3434 tocopy = sb->s_blocksize - offset < toread ?
3435 sb->s_blocksize - offset : toread;
617ba13b 3436 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3437 if (err)
3438 return err;
3439 if (!bh) /* A hole? */
3440 memset(data, 0, tocopy);
3441 else
3442 memcpy(data, bh->b_data+offset, tocopy);
3443 brelse(bh);
3444 offset = 0;
3445 toread -= tocopy;
3446 data += tocopy;
3447 blk++;
3448 }
3449 return len;
3450}
3451
3452/* Write to quotafile (we know the transaction is already started and has
3453 * enough credits) */
617ba13b 3454static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3455 const char *data, size_t len, loff_t off)
3456{
3457 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3458 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3459 int err = 0;
3460 int offset = off & (sb->s_blocksize - 1);
3461 int tocopy;
617ba13b 3462 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3463 size_t towrite = len;
3464 struct buffer_head *bh;
3465 handle_t *handle = journal_current_handle();
3466
9c3013e9 3467 if (!handle) {
e5f8eab8 3468 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3469 " cancelled because transaction is not started.\n",
3470 (unsigned long long)off, (unsigned long long)len);
3471 return -EIO;
3472 }
ac27a0ec
DK		 3473 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3474 while (towrite > 0) {
3475 tocopy = sb->s_blocksize - offset < towrite ?
3476 sb->s_blocksize - offset : towrite;
617ba13b 3477 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3478 if (!bh)
3479 goto out;
3480 if (journal_quota) {
617ba13b 3481 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3482 if (err) {
3483 brelse(bh);
3484 goto out;
3485 }
3486 }
3487 lock_buffer(bh);
3488 memcpy(bh->b_data+offset, data, tocopy);
3489 flush_dcache_page(bh->b_page);
3490 unlock_buffer(bh);
3491 if (journal_quota)
617ba13b 3492 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3493 else {
3494 /* Always do at least ordered writes for quotas */
678aaf48 3495 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3496 mark_buffer_dirty(bh);
3497 }
3498 brelse(bh);
3499 if (err)
3500 goto out;
3501 offset = 0;
3502 towrite -= tocopy;
3503 data += tocopy;
3504 blk++;
3505 }
3506out:
4d04e4fb
JK		 3507 if (len == towrite) {
3508 mutex_unlock(&inode->i_mutex);
ac27a0ec 3509 return err;
4d04e4fb 3510 }
ac27a0ec
DK		 3511 if (inode->i_size < off+len-towrite) {
3512 i_size_write(inode, off+len-towrite);
617ba13b 3513 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3514 }
ac27a0ec 3515 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3516 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3517 mutex_unlock(&inode->i_mutex);
3518 return len - towrite;
3519}
3520
3521#endif
3522
617ba13b 3523static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3524 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3525{
617ba13b 3526 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3527}
3528
617ba13b 3529static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3530 .owner = THIS_MODULE,
617ba13b
MC		 3531 .name = "ext4dev",
3532 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3533 .kill_sb = kill_block_super,
3534 .fs_flags = FS_REQUIRES_DEV,
3535};
3536
617ba13b 3537static int __init init_ext4_fs(void)
ac27a0ec 3538{
c9de560d
AT		 3539 int err;
3540
3541 err = init_ext4_mballoc();
ac27a0ec
DK		 3542 if (err)
3543 return err;
c9de560d
AT		 3544
3545 err = init_ext4_xattr();
3546 if (err)
3547 goto out2;
ac27a0ec
DK		 3548 err = init_inodecache();
3549 if (err)
3550 goto out1;
63f57933 3551 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3552 if (err)
3553 goto out;
3554 return 0;
3555out:
3556 destroy_inodecache();
3557out1:
617ba13b 3558 exit_ext4_xattr();
c9de560d
AT		 3559out2:
3560 exit_ext4_mballoc();
ac27a0ec
DK		 3561 return err;
3562}
3563
617ba13b 3564static void __exit exit_ext4_fs(void)
ac27a0ec 3565{
617ba13b 3566 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3567 destroy_inodecache();
617ba13b 3568 exit_ext4_xattr();
c9de560d 3569 exit_ext4_mballoc();
ac27a0ec
DK		 3570}
3571
3572MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3573MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3574MODULE_LICENSE("GPL");
617ba13b
MC		 3575module_init(init_ext4_fs)
3576module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)