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ext4: fix missing ext4_unlock_group in error path
[net-next-2.6.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
dab291af 23#include <linux/jbd2.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
27#include <linux/parser.h>
28#include <linux/smp_lock.h>
29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
ede86cc4 38#include <linux/marker.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
3dcf5451
CH		 43#include "ext4.h"
44#include "ext4_jbd2.h"
ac27a0ec
DK		 45#include "xattr.h"
46#include "acl.h"
47#include "namei.h"
717d50e4 48#include "group.h"
ac27a0ec 49
9f6200bb
TT		 50struct proc_dir_entry *ext4_proc_root;
51
617ba13b 52static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 53 unsigned long journal_devnum);
617ba13b 54static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 55 unsigned int);
2b2d6d01
TT		 56static void ext4_commit_super(struct super_block *sb,
57 struct ext4_super_block *es, int sync);
58static void ext4_mark_recovery_complete(struct super_block *sb,
59 struct ext4_super_block *es);
60static void ext4_clear_journal_err(struct super_block *sb,
61 struct ext4_super_block *es);
617ba13b 62static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 63static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 64 char nbuf[16]);
2b2d6d01
TT		 65static int ext4_remount(struct super_block *sb, int *flags, char *data);
66static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
617ba13b 67static void ext4_unlockfs(struct super_block *sb);
2b2d6d01 68static void ext4_write_super(struct super_block *sb);
617ba13b 69static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 70
bd81d8ee 71
8fadc143
AR		 72ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
73 struct ext4_group_desc *bg)
bd81d8ee 74{
3a14589c 75 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 76 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 77 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 78}
79
8fadc143
AR		 80ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
bd81d8ee 82{
5272f837 83 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 85 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 86}
87
8fadc143
AR		 88ext4_fsblk_t ext4_inode_table(struct super_block *sb,
89 struct ext4_group_desc *bg)
bd81d8ee 90{
5272f837 91 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 94}
95
8fadc143
AR		 96void ext4_block_bitmap_set(struct super_block *sb,
97 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 98{
3a14589c 99 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 100 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
101 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 102}
103
8fadc143
AR		 104void ext4_inode_bitmap_set(struct super_block *sb,
105 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 106{
5272f837 107 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 108 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
109 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 110}
111
8fadc143
AR		 112void ext4_inode_table_set(struct super_block *sb,
113 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 114{
5272f837 115 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 116 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
117 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 118}
119
ac27a0ec 120/*
dab291af 121 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 122 *
123 * The only special thing we need to do here is to make sure that all
124 * journal_end calls result in the superblock being marked dirty, so
125 * that sync() will call the filesystem's write_super callback if
126 * appropriate.
127 */
617ba13b 128handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 129{
130 journal_t *journal;
131
132 if (sb->s_flags & MS_RDONLY)
133 return ERR_PTR(-EROFS);
134
135 /* Special case here: if the journal has aborted behind our
136 * backs (eg. EIO in the commit thread), then we still need to
137 * take the FS itself readonly cleanly. */
617ba13b 138 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 139 if (is_journal_aborted(journal)) {
46e665e9 140 ext4_abort(sb, __func__,
ac27a0ec
DK		 141 "Detected aborted journal");
142 return ERR_PTR(-EROFS);
143 }
144
dab291af 145 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 146}
147
148/*
149 * The only special thing we need to do here is to make sure that all
dab291af 150 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 151 * that sync() will call the filesystem's write_super callback if
152 * appropriate.
153 */
617ba13b 154int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 155{
156 struct super_block *sb;
157 int err;
158 int rc;
159
160 sb = handle->h_transaction->t_journal->j_private;
161 err = handle->h_err;
dab291af 162 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 163
164 if (!err)
165 err = rc;
166 if (err)
617ba13b 167 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 168 return err;
169}
170
617ba13b 171void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 172 struct buffer_head *bh, handle_t *handle, int err)
173{
174 char nbuf[16];
617ba13b 175 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec
DK		 176
177 if (bh)
178 BUFFER_TRACE(bh, "abort");
179
180 if (!handle->h_err)
181 handle->h_err = err;
182
183 if (is_handle_aborted(handle))
184 return;
185
186 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
187 caller, errstr, err_fn);
188
dab291af 189 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 190}
191
192/* Deal with the reporting of failure conditions on a filesystem such as
193 * inconsistencies detected or read IO failures.
194 *
195 * On ext2, we can store the error state of the filesystem in the
617ba13b 196 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 197 * write ordering constraints on the superblock which prevent us from
198 * writing it out straight away; and given that the journal is about to
199 * be aborted, we can't rely on the current, or future, transactions to
200 * write out the superblock safely.
201 *
dab291af 202 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 203 * the journal instead. On recovery, the journal will compain about
204 * that error until we've noted it down and cleared it.
205 */
206
617ba13b 207static void ext4_handle_error(struct super_block *sb)
ac27a0ec 208{
617ba13b 209 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 210
617ba13b
MC		 211 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
212 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 213
214 if (sb->s_flags & MS_RDONLY)
215 return;
216
2b2d6d01 217 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 218 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 219
617ba13b 220 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 221 if (journal)
dab291af 222 jbd2_journal_abort(journal, -EIO);
ac27a0ec 223 }
2b2d6d01
TT		 224 if (test_opt(sb, ERRORS_RO)) {
225 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 226 sb->s_flags |= MS_RDONLY;
227 }
617ba13b 228 ext4_commit_super(sb, es, 1);
ac27a0ec 229 if (test_opt(sb, ERRORS_PANIC))
617ba13b 230 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 231 sb->s_id);
232}
233
2b2d6d01
TT		 234void ext4_error(struct super_block *sb, const char *function,
235 const char *fmt, ...)
ac27a0ec
DK		 236{
237 va_list args;
238
239 va_start(args, fmt);
2b2d6d01 240 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 241 vprintk(fmt, args);
242 printk("\n");
243 va_end(args);
244
617ba13b 245 ext4_handle_error(sb);
ac27a0ec
DK		 246}
247
2b2d6d01 248static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 249 char nbuf[16])
250{
251 char *errstr = NULL;
252
253 switch (errno) {
254 case -EIO:
255 errstr = "IO failure";
256 break;
257 case -ENOMEM:
258 errstr = "Out of memory";
259 break;
260 case -EROFS:
dab291af 261 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 262 errstr = "Journal has aborted";
263 else
264 errstr = "Readonly filesystem";
265 break;
266 default:
267 /* If the caller passed in an extra buffer for unknown
268 * errors, textualise them now. Else we just return
269 * NULL. */
270 if (nbuf) {
271 /* Check for truncated error codes... */
272 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
273 errstr = nbuf;
274 }
275 break;
276 }
277
278 return errstr;
279}
280
617ba13b 281/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 282 * automatically and invokes the appropriate error response. */
283
2b2d6d01 284void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 285{
286 char nbuf[16];
287 const char *errstr;
288
289 /* Special case: if the error is EROFS, and we're not already
290 * inside a transaction, then there's really no point in logging
291 * an error. */
292 if (errno == -EROFS && journal_current_handle() == NULL &&
293 (sb->s_flags & MS_RDONLY))
294 return;
295
617ba13b 296 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 297 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
298 sb->s_id, function, errstr);
ac27a0ec 299
617ba13b 300 ext4_handle_error(sb);
ac27a0ec
DK		 301}
302
303/*
617ba13b 304 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 305 * abort function may be used to deal with unrecoverable failures such
306 * as journal IO errors or ENOMEM at a critical moment in log management.
307 *
308 * We unconditionally force the filesystem into an ABORT|READONLY state,
309 * unless the error response on the fs has been set to panic in which
310 * case we take the easy way out and panic immediately.
311 */
312
2b2d6d01
TT		 313void ext4_abort(struct super_block *sb, const char *function,
314 const char *fmt, ...)
ac27a0ec
DK		 315{
316 va_list args;
317
2b2d6d01 318 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 319
320 va_start(args, fmt);
2b2d6d01 321 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 322 vprintk(fmt, args);
323 printk("\n");
324 va_end(args);
325
326 if (test_opt(sb, ERRORS_PANIC))
617ba13b 327 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 328
329 if (sb->s_flags & MS_RDONLY)
330 return;
331
332 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 333 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 334 sb->s_flags |= MS_RDONLY;
617ba13b 335 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ef2cabf7
HK		 336 if (EXT4_SB(sb)->s_journal)
337 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 338}
339
2b2d6d01
TT		 340void ext4_warning(struct super_block *sb, const char *function,
341 const char *fmt, ...)
ac27a0ec
DK		 342{
343 va_list args;
344
345 va_start(args, fmt);
617ba13b 346 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 347 sb->s_id, function);
348 vprintk(fmt, args);
349 printk("\n");
350 va_end(args);
351}
352
617ba13b 353void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 354{
617ba13b 355 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 356
617ba13b 357 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 358 return;
359
46e665e9 360 ext4_warning(sb, __func__,
ac27a0ec
DK		 361 "updating to rev %d because of new feature flag, "
362 "running e2fsck is recommended",
617ba13b 363 EXT4_DYNAMIC_REV);
ac27a0ec 364
617ba13b
MC		 365 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
366 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
367 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 368 /* leave es->s_feature_*compat flags alone */
369 /* es->s_uuid will be set by e2fsck if empty */
370
371 /*
372 * The rest of the superblock fields should be zero, and if not it
373 * means they are likely already in use, so leave them alone. We
374 * can leave it up to e2fsck to clean up any inconsistencies there.
375 */
376}
377
378/*
379 * Open the external journal device
380 */
617ba13b 381static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 382{
383 struct block_device *bdev;
384 char b[BDEVNAME_SIZE];
385
386 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
387 if (IS_ERR(bdev))
388 goto fail;
389 return bdev;
390
391fail:
617ba13b 392 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 393 __bdevname(dev, b), PTR_ERR(bdev));
394 return NULL;
395}
396
397/*
398 * Release the journal device
399 */
617ba13b 400static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 401{
402 bd_release(bdev);
9a1c3542 403 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 404}
405
617ba13b 406static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 407{
408 struct block_device *bdev;
409 int ret = -ENODEV;
410
411 bdev = sbi->journal_bdev;
412 if (bdev) {
617ba13b 413 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 414 sbi->journal_bdev = NULL;
415 }
416 return ret;
417}
418
419static inline struct inode *orphan_list_entry(struct list_head *l)
420{
617ba13b 421 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 422}
423
617ba13b 424static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 425{
426 struct list_head *l;
427
428 printk(KERN_ERR "sb orphan head is %d\n",
429 le32_to_cpu(sbi->s_es->s_last_orphan));
430
431 printk(KERN_ERR "sb_info orphan list:\n");
432 list_for_each(l, &sbi->s_orphan) {
433 struct inode *inode = orphan_list_entry(l);
434 printk(KERN_ERR " "
435 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
436 inode->i_sb->s_id, inode->i_ino, inode,
437 inode->i_mode, inode->i_nlink,
438 NEXT_ORPHAN(inode));
439 }
440}
441
2b2d6d01 442static void ext4_put_super(struct super_block *sb)
ac27a0ec 443{
617ba13b
MC		 444 struct ext4_sb_info *sbi = EXT4_SB(sb);
445 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 446 int i, err;
ac27a0ec 447
c9de560d 448 ext4_mb_release(sb);
a86c6181 449 ext4_ext_release(sb);
617ba13b 450 ext4_xattr_put_super(sb);
ef2cabf7 451 err = jbd2_journal_destroy(sbi->s_journal);
47b4a50b 452 sbi->s_journal = NULL;
ef2cabf7
HK		 453 if (err < 0)
454 ext4_abort(sb, __func__, "Couldn't clean up the journal");
455
ac27a0ec 456 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 457 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 458 es->s_state = cpu_to_le16(sbi->s_mount_state);
617ba13b 459 ext4_commit_super(sb, es, 1);
ac27a0ec 460 }
240799cd
TT		 461 if (sbi->s_proc) {
462 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
9f6200bb 463 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 464 }
ac27a0ec
DK		 465
466 for (i = 0; i < sbi->s_gdb_count; i++)
467 brelse(sbi->s_group_desc[i]);
468 kfree(sbi->s_group_desc);
772cb7c8 469 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 470 percpu_counter_destroy(&sbi->s_freeblocks_counter);
471 percpu_counter_destroy(&sbi->s_freeinodes_counter);
472 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 473 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 474 brelse(sbi->s_sbh);
475#ifdef CONFIG_QUOTA
476 for (i = 0; i < MAXQUOTAS; i++)
477 kfree(sbi->s_qf_names[i]);
478#endif
479
480 /* Debugging code just in case the in-memory inode orphan list
481 * isn't empty. The on-disk one can be non-empty if we've
482 * detected an error and taken the fs readonly, but the
483 * in-memory list had better be clean by this point. */
484 if (!list_empty(&sbi->s_orphan))
485 dump_orphan_list(sb, sbi);
486 J_ASSERT(list_empty(&sbi->s_orphan));
487
f98393a6 488 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 489 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
490 /*
491 * Invalidate the journal device's buffers. We don't want them
492 * floating about in memory - the physical journal device may
493 * hotswapped, and it breaks the `ro-after' testing code.
494 */
495 sync_blockdev(sbi->journal_bdev);
f98393a6 496 invalidate_bdev(sbi->journal_bdev);
617ba13b 497 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 498 }
499 sb->s_fs_info = NULL;
500 kfree(sbi);
501 return;
502}
503
e18b890b 504static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 505
506/*
507 * Called inside transaction, so use GFP_NOFS
508 */
617ba13b 509static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 510{
617ba13b 511 struct ext4_inode_info *ei;
ac27a0ec 512
e6b4f8da 513 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 514 if (!ei)
515 return NULL;
03010a33 516#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 517 ei->i_acl = EXT4_ACL_NOT_CACHED;
518 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec 519#endif
ac27a0ec 520 ei->vfs_inode.i_version = 1;
91246c00 521 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 522 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 523 INIT_LIST_HEAD(&ei->i_prealloc_list);
524 spin_lock_init(&ei->i_prealloc_lock);
678aaf48 525 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 526 ei->i_reserved_data_blocks = 0;
527 ei->i_reserved_meta_blocks = 0;
528 ei->i_allocated_meta_blocks = 0;
529 ei->i_delalloc_reserved_flag = 0;
530 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 531 return &ei->vfs_inode;
532}
533
617ba13b 534static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 535{
9f7dd93d
VA		 536 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
537 printk("EXT4 Inode %p: orphan list check failed!\n",
538 EXT4_I(inode));
539 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
540 EXT4_I(inode), sizeof(struct ext4_inode_info),
541 true);
542 dump_stack();
543 }
617ba13b 544 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 545}
546
51cc5068 547static void init_once(void *foo)
ac27a0ec 548{
617ba13b 549 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 550
a35afb83 551 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 552#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 553 init_rwsem(&ei->xattr_sem);
ac27a0ec 554#endif
0e855ac8 555 init_rwsem(&ei->i_data_sem);
a35afb83 556 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 557}
558
559static int init_inodecache(void)
560{
617ba13b
MC		 561 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
562 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 563 0, (SLAB_RECLAIM_ACCOUNT|
564 SLAB_MEM_SPREAD),
20c2df83 565 init_once);
617ba13b 566 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 567 return -ENOMEM;
568 return 0;
569}
570
571static void destroy_inodecache(void)
572{
617ba13b 573 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 574}
575
617ba13b 576static void ext4_clear_inode(struct inode *inode)
ac27a0ec 577{
03010a33 578#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 579 if (EXT4_I(inode)->i_acl &&
580 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
581 posix_acl_release(EXT4_I(inode)->i_acl);
582 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
583 }
584 if (EXT4_I(inode)->i_default_acl &&
585 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
586 posix_acl_release(EXT4_I(inode)->i_default_acl);
587 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 588 }
589#endif
c2ea3fde 590 ext4_discard_preallocations(inode);
678aaf48
JK		 591 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
592 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 593}
594
2b2d6d01
TT		 595static inline void ext4_show_quota_options(struct seq_file *seq,
596 struct super_block *sb)
ac27a0ec
DK		 597{
598#if defined(CONFIG_QUOTA)
617ba13b 599 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 600
601 if (sbi->s_jquota_fmt)
602 seq_printf(seq, ",jqfmt=%s",
af5bc92d 603 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 604
605 if (sbi->s_qf_names[USRQUOTA])
606 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
607
608 if (sbi->s_qf_names[GRPQUOTA])
609 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
610
617ba13b 611 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 612 seq_puts(seq, ",usrquota");
613
617ba13b 614 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 615 seq_puts(seq, ",grpquota");
616#endif
617}
618
d9c9bef1
MS		 619/*
620 * Show an option if
621 * - it's set to a non-default value OR
622 * - if the per-sb default is different from the global default
623 */
617ba13b 624static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 625{
aa22df2c
AK		 626 int def_errors;
627 unsigned long def_mount_opts;
ac27a0ec 628 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 629 struct ext4_sb_info *sbi = EXT4_SB(sb);
630 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 631
632 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 633 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 634
635 if (sbi->s_sb_block != 1)
636 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
637 if (test_opt(sb, MINIX_DF))
638 seq_puts(seq, ",minixdf");
aa22df2c 639 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 640 seq_puts(seq, ",grpid");
641 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
642 seq_puts(seq, ",nogrpid");
643 if (sbi->s_resuid != EXT4_DEF_RESUID ||
644 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
645 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
646 }
647 if (sbi->s_resgid != EXT4_DEF_RESGID ||
648 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
649 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
650 }
bb4f397a 651 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 652 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 653 def_errors == EXT4_ERRORS_CONTINUE) {
654 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 655 }
656 }
aa22df2c 657 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 658 seq_puts(seq, ",errors=continue");
aa22df2c 659 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 660 seq_puts(seq, ",errors=panic");
aa22df2c 661 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 662 seq_puts(seq, ",nouid32");
aa22df2c 663 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 664 seq_puts(seq, ",debug");
665 if (test_opt(sb, OLDALLOC))
666 seq_puts(seq, ",oldalloc");
03010a33 667#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 668 if (test_opt(sb, XATTR_USER) &&
669 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 670 seq_puts(seq, ",user_xattr");
671 if (!test_opt(sb, XATTR_USER) &&
672 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
673 seq_puts(seq, ",nouser_xattr");
674 }
675#endif
03010a33 676#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 677 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 678 seq_puts(seq, ",acl");
679 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
680 seq_puts(seq, ",noacl");
681#endif
682 if (!test_opt(sb, RESERVATION))
683 seq_puts(seq, ",noreservation");
684 if (sbi->s_commit_interval) {
685 seq_printf(seq, ",commit=%u",
686 (unsigned) (sbi->s_commit_interval / HZ));
687 }
571640ca
ES		 688 /*
689 * We're changing the default of barrier mount option, so
690 * let's always display its mount state so it's clear what its
691 * status is.
692 */
693 seq_puts(seq, ",barrier=");
694 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 695 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
696 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 697 if (test_opt(sb, NOBH))
698 seq_puts(seq, ",nobh");
699 if (!test_opt(sb, EXTENTS))
700 seq_puts(seq, ",noextents");
25ec56b5
JNC		 701 if (test_opt(sb, I_VERSION))
702 seq_puts(seq, ",i_version");
dd919b98
AK		 703 if (!test_opt(sb, DELALLOC))
704 seq_puts(seq, ",nodelalloc");
705
ac27a0ec 706
cb45bbe4
MS		 707 if (sbi->s_stripe)
708 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 709 /*
710 * journal mode get enabled in different ways
711 * So just print the value even if we didn't specify it
712 */
617ba13b 713 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 714 seq_puts(seq, ",data=journal");
617ba13b 715 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 716 seq_puts(seq, ",data=ordered");
617ba13b 717 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 718 seq_puts(seq, ",data=writeback");
719
240799cd
TT		 720 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
721 seq_printf(seq, ",inode_readahead_blks=%u",
722 sbi->s_inode_readahead_blks);
723
5bf5683a
HK		 724 if (test_opt(sb, DATA_ERR_ABORT))
725 seq_puts(seq, ",data_err=abort");
726
617ba13b 727 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 728 return 0;
729}
730
731
1b961ac0
CH		 732static struct inode *ext4_nfs_get_inode(struct super_block *sb,
733 u64 ino, u32 generation)
ac27a0ec 734{
ac27a0ec 735 struct inode *inode;
ac27a0ec 736
617ba13b 737 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 738 return ERR_PTR(-ESTALE);
617ba13b 739 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 740 return ERR_PTR(-ESTALE);
741
742 /* iget isn't really right if the inode is currently unallocated!!
743 *
617ba13b 744 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 745 * deleted, so we should be safe.
746 *
747 * Currently we don't know the generation for parent directory, so
748 * a generation of 0 means "accept any"
749 */
1d1fe1ee
DH		 750 inode = ext4_iget(sb, ino);
751 if (IS_ERR(inode))
752 return ERR_CAST(inode);
753 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 754 iput(inode);
755 return ERR_PTR(-ESTALE);
756 }
1b961ac0
CH		 757
758 return inode;
759}
760
761static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
762 int fh_len, int fh_type)
763{
764 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
765 ext4_nfs_get_inode);
766}
767
768static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
769 int fh_len, int fh_type)
770{
771 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
772 ext4_nfs_get_inode);
ac27a0ec
DK		 773}
774
775#ifdef CONFIG_QUOTA
af5bc92d 776#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 777#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 778
617ba13b
MC		 779static int ext4_dquot_initialize(struct inode *inode, int type);
780static int ext4_dquot_drop(struct inode *inode);
781static int ext4_write_dquot(struct dquot *dquot);
782static int ext4_acquire_dquot(struct dquot *dquot);
783static int ext4_release_dquot(struct dquot *dquot);
784static int ext4_mark_dquot_dirty(struct dquot *dquot);
785static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 786static int ext4_quota_on(struct super_block *sb, int type, int format_id,
787 char *path, int remount);
617ba13b
MC		 788static int ext4_quota_on_mount(struct super_block *sb, int type);
789static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 790 size_t len, loff_t off);
617ba13b 791static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 792 const char *data, size_t len, loff_t off);
793
617ba13b
MC		 794static struct dquot_operations ext4_quota_operations = {
795 .initialize = ext4_dquot_initialize,
796 .drop = ext4_dquot_drop,
ac27a0ec
DK		 797 .alloc_space = dquot_alloc_space,
798 .alloc_inode = dquot_alloc_inode,
799 .free_space = dquot_free_space,
800 .free_inode = dquot_free_inode,
801 .transfer = dquot_transfer,
617ba13b
MC		 802 .write_dquot = ext4_write_dquot,
803 .acquire_dquot = ext4_acquire_dquot,
804 .release_dquot = ext4_release_dquot,
805 .mark_dirty = ext4_mark_dquot_dirty,
806 .write_info = ext4_write_info
ac27a0ec
DK		 807};
808
617ba13b
MC		 809static struct quotactl_ops ext4_qctl_operations = {
810 .quota_on = ext4_quota_on,
ac27a0ec
DK		 811 .quota_off = vfs_quota_off,
812 .quota_sync = vfs_quota_sync,
813 .get_info = vfs_get_dqinfo,
814 .set_info = vfs_set_dqinfo,
815 .get_dqblk = vfs_get_dqblk,
816 .set_dqblk = vfs_set_dqblk
817};
818#endif
819
ee9b6d61 820static const struct super_operations ext4_sops = {
617ba13b
MC		 821 .alloc_inode = ext4_alloc_inode,
822 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 823 .write_inode = ext4_write_inode,
824 .dirty_inode = ext4_dirty_inode,
825 .delete_inode = ext4_delete_inode,
826 .put_super = ext4_put_super,
827 .write_super = ext4_write_super,
828 .sync_fs = ext4_sync_fs,
829 .write_super_lockfs = ext4_write_super_lockfs,
830 .unlockfs = ext4_unlockfs,
831 .statfs = ext4_statfs,
832 .remount_fs = ext4_remount,
833 .clear_inode = ext4_clear_inode,
834 .show_options = ext4_show_options,
ac27a0ec 835#ifdef CONFIG_QUOTA
617ba13b
MC		 836 .quota_read = ext4_quota_read,
837 .quota_write = ext4_quota_write,
ac27a0ec
DK		 838#endif
839};
840
39655164 841static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 842 .fh_to_dentry = ext4_fh_to_dentry,
843 .fh_to_parent = ext4_fh_to_parent,
617ba13b 844 .get_parent = ext4_get_parent,
ac27a0ec
DK		 845};
846
847enum {
848 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
849 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 850 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec
DK		 851 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
852 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
853 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 854 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 855 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
5bf5683a 856 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec
DK		 857 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
858 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
859 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 860 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
01436ef2 861 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
240799cd 862 Opt_inode_readahead_blks
ac27a0ec
DK		 863};
864
a447c093 865static const match_table_t tokens = {
ac27a0ec
DK		 866 {Opt_bsd_df, "bsddf"},
867 {Opt_minix_df, "minixdf"},
868 {Opt_grpid, "grpid"},
869 {Opt_grpid, "bsdgroups"},
870 {Opt_nogrpid, "nogrpid"},
871 {Opt_nogrpid, "sysvgroups"},
872 {Opt_resgid, "resgid=%u"},
873 {Opt_resuid, "resuid=%u"},
874 {Opt_sb, "sb=%u"},
875 {Opt_err_cont, "errors=continue"},
876 {Opt_err_panic, "errors=panic"},
877 {Opt_err_ro, "errors=remount-ro"},
878 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 879 {Opt_debug, "debug"},
880 {Opt_oldalloc, "oldalloc"},
881 {Opt_orlov, "orlov"},
882 {Opt_user_xattr, "user_xattr"},
883 {Opt_nouser_xattr, "nouser_xattr"},
884 {Opt_acl, "acl"},
885 {Opt_noacl, "noacl"},
886 {Opt_reservation, "reservation"},
887 {Opt_noreservation, "noreservation"},
888 {Opt_noload, "noload"},
889 {Opt_nobh, "nobh"},
890 {Opt_bh, "bh"},
891 {Opt_commit, "commit=%u"},
892 {Opt_journal_update, "journal=update"},
893 {Opt_journal_inum, "journal=%u"},
894 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 895 {Opt_journal_checksum, "journal_checksum"},
896 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 897 {Opt_abort, "abort"},
898 {Opt_data_journal, "data=journal"},
899 {Opt_data_ordered, "data=ordered"},
900 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 901 {Opt_data_err_abort, "data_err=abort"},
902 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 903 {Opt_offusrjquota, "usrjquota="},
904 {Opt_usrjquota, "usrjquota=%s"},
905 {Opt_offgrpjquota, "grpjquota="},
906 {Opt_grpjquota, "grpjquota=%s"},
907 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
908 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
909 {Opt_grpquota, "grpquota"},
910 {Opt_noquota, "noquota"},
911 {Opt_quota, "quota"},
912 {Opt_usrquota, "usrquota"},
913 {Opt_barrier, "barrier=%u"},
a86c6181 914 {Opt_extents, "extents"},
1e2462f9 915 {Opt_noextents, "noextents"},
25ec56b5 916 {Opt_i_version, "i_version"},
c9de560d 917 {Opt_stripe, "stripe=%u"},
ac27a0ec 918 {Opt_resize, "resize"},
64769240 919 {Opt_delalloc, "delalloc"},
dd919b98 920 {Opt_nodelalloc, "nodelalloc"},
240799cd 921 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
f3f12faa 922 {Opt_err, NULL},
ac27a0ec
DK		 923};
924
617ba13b 925static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 926{
617ba13b 927 ext4_fsblk_t sb_block;
ac27a0ec
DK		 928 char *options = (char *) *data;
929
930 if (!options || strncmp(options, "sb=", 3) != 0)
931 return 1; /* Default location */
932 options += 3;
617ba13b 933 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 934 sb_block = simple_strtoul(options, &options, 0);
935 if (*options && *options != ',') {
4776004f 936 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 937 (char *) *data);
938 return 1;
939 }
940 if (*options == ',')
941 options++;
942 *data = (void *) options;
943 return sb_block;
944}
945
2b2d6d01
TT		 946static int parse_options(char *options, struct super_block *sb,
947 unsigned int *inum, unsigned long *journal_devnum,
948 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 949{
617ba13b 950 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 951 char *p;
ac27a0ec
DK		 952 substring_t args[MAX_OPT_ARGS];
953 int data_opt = 0;
954 int option;
955#ifdef CONFIG_QUOTA
dfc5d03f 956 int qtype, qfmt;
ac27a0ec
DK		 957 char *qname;
958#endif
c07651b5 959 ext4_fsblk_t last_block;
ac27a0ec
DK		 960
961 if (!options)
962 return 1;
963
2b2d6d01 964 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 965 int token;
966 if (!*p)
967 continue;
968
969 token = match_token(p, tokens, args);
970 switch (token) {
971 case Opt_bsd_df:
2b2d6d01 972 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 973 break;
974 case Opt_minix_df:
2b2d6d01 975 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 976 break;
977 case Opt_grpid:
2b2d6d01 978 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 979 break;
980 case Opt_nogrpid:
2b2d6d01 981 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 982 break;
983 case Opt_resuid:
984 if (match_int(&args[0], &option))
985 return 0;
986 sbi->s_resuid = option;
987 break;
988 case Opt_resgid:
989 if (match_int(&args[0], &option))
990 return 0;
991 sbi->s_resgid = option;
992 break;
993 case Opt_sb:
994 /* handled by get_sb_block() instead of here */
995 /* *sb_block = match_int(&args[0]); */
996 break;
997 case Opt_err_panic:
2b2d6d01
TT		 998 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
999 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1000 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1001 break;
1002 case Opt_err_ro:
2b2d6d01
TT		 1003 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1004 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1005 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1006 break;
1007 case Opt_err_cont:
2b2d6d01
TT		 1008 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1009 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1010 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1011 break;
1012 case Opt_nouid32:
2b2d6d01 1013 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1014 break;
ac27a0ec 1015 case Opt_debug:
2b2d6d01 1016 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1017 break;
1018 case Opt_oldalloc:
2b2d6d01 1019 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1020 break;
1021 case Opt_orlov:
2b2d6d01 1022 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1023 break;
03010a33 1024#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1025 case Opt_user_xattr:
2b2d6d01 1026 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1027 break;
1028 case Opt_nouser_xattr:
2b2d6d01 1029 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1030 break;
1031#else
1032 case Opt_user_xattr:
1033 case Opt_nouser_xattr:
4776004f
TT		 1034 printk(KERN_ERR "EXT4 (no)user_xattr options "
1035 "not supported\n");
ac27a0ec
DK		 1036 break;
1037#endif
03010a33 1038#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1039 case Opt_acl:
1040 set_opt(sbi->s_mount_opt, POSIX_ACL);
1041 break;
1042 case Opt_noacl:
1043 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1044 break;
1045#else
1046 case Opt_acl:
1047 case Opt_noacl:
4776004f
TT		 1048 printk(KERN_ERR "EXT4 (no)acl options "
1049 "not supported\n");
ac27a0ec
DK		 1050 break;
1051#endif
1052 case Opt_reservation:
1053 set_opt(sbi->s_mount_opt, RESERVATION);
1054 break;
1055 case Opt_noreservation:
1056 clear_opt(sbi->s_mount_opt, RESERVATION);
1057 break;
1058 case Opt_journal_update:
1059 /* @@@ FIXME */
1060 /* Eventually we will want to be able to create
1061 a journal file here. For now, only allow the
1062 user to specify an existing inode to be the
1063 journal file. */
1064 if (is_remount) {
617ba13b 1065 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1066 "journal on remount\n");
1067 return 0;
1068 }
2b2d6d01 1069 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec
DK		 1070 break;
1071 case Opt_journal_inum:
1072 if (is_remount) {
617ba13b 1073 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1074 "journal on remount\n");
1075 return 0;
1076 }
1077 if (match_int(&args[0], &option))
1078 return 0;
1079 *inum = option;
1080 break;
1081 case Opt_journal_dev:
1082 if (is_remount) {
617ba13b 1083 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1084 "journal on remount\n");
1085 return 0;
1086 }
1087 if (match_int(&args[0], &option))
1088 return 0;
1089 *journal_devnum = option;
1090 break;
818d276c
GS		 1091 case Opt_journal_checksum:
1092 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1093 break;
1094 case Opt_journal_async_commit:
1095 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1096 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1097 break;
ac27a0ec 1098 case Opt_noload:
2b2d6d01 1099 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1100 break;
1101 case Opt_commit:
1102 if (match_int(&args[0], &option))
1103 return 0;
1104 if (option < 0)
1105 return 0;
1106 if (option == 0)
cd02ff0b 1107 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1108 sbi->s_commit_interval = HZ * option;
1109 break;
1110 case Opt_data_journal:
617ba13b 1111 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1112 goto datacheck;
1113 case Opt_data_ordered:
617ba13b 1114 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1115 goto datacheck;
1116 case Opt_data_writeback:
617ba13b 1117 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1118 datacheck:
1119 if (is_remount) {
617ba13b 1120 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1121 != data_opt) {
1122 printk(KERN_ERR
617ba13b 1123 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1124 "mode on remount\n");
1125 return 0;
1126 }
1127 } else {
617ba13b 1128 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1129 sbi->s_mount_opt |= data_opt;
1130 }
1131 break;
5bf5683a
HK		 1132 case Opt_data_err_abort:
1133 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1134 break;
1135 case Opt_data_err_ignore:
1136 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1137 break;
ac27a0ec
DK		 1138#ifdef CONFIG_QUOTA
1139 case Opt_usrjquota:
1140 qtype = USRQUOTA;
1141 goto set_qf_name;
1142 case Opt_grpjquota:
1143 qtype = GRPQUOTA;
1144set_qf_name:
dfc5d03f
JK		 1145 if ((sb_any_quota_enabled(sb) ||
1146 sb_any_quota_suspended(sb)) &&
1147 !sbi->s_qf_names[qtype]) {
ac27a0ec 1148 printk(KERN_ERR
4776004f
TT		 1149 "EXT4-fs: Cannot change journaled "
1150 "quota options when quota turned on.\n");
ac27a0ec
DK		 1151 return 0;
1152 }
1153 qname = match_strdup(&args[0]);
1154 if (!qname) {
1155 printk(KERN_ERR
617ba13b 1156 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1157 "storing quotafile name.\n");
1158 return 0;
1159 }
1160 if (sbi->s_qf_names[qtype] &&
1161 strcmp(sbi->s_qf_names[qtype], qname)) {
1162 printk(KERN_ERR
617ba13b 1163 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1164 "specified.\n", QTYPE2NAME(qtype));
1165 kfree(qname);
1166 return 0;
1167 }
1168 sbi->s_qf_names[qtype] = qname;
1169 if (strchr(sbi->s_qf_names[qtype], '/')) {
1170 printk(KERN_ERR
617ba13b 1171 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1172 "filesystem root.\n");
1173 kfree(sbi->s_qf_names[qtype]);
1174 sbi->s_qf_names[qtype] = NULL;
1175 return 0;
1176 }
1177 set_opt(sbi->s_mount_opt, QUOTA);
1178 break;
1179 case Opt_offusrjquota:
1180 qtype = USRQUOTA;
1181 goto clear_qf_name;
1182 case Opt_offgrpjquota:
1183 qtype = GRPQUOTA;
1184clear_qf_name:
dfc5d03f
JK		 1185 if ((sb_any_quota_enabled(sb) ||
1186 sb_any_quota_suspended(sb)) &&
1187 sbi->s_qf_names[qtype]) {
617ba13b 1188 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1189 "journaled quota options when "
ac27a0ec
DK		 1190 "quota turned on.\n");
1191 return 0;
1192 }
1193 /*
1194 * The space will be released later when all options
1195 * are confirmed to be correct
1196 */
1197 sbi->s_qf_names[qtype] = NULL;
1198 break;
1199 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1200 qfmt = QFMT_VFS_OLD;
1201 goto set_qf_format;
ac27a0ec 1202 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1203 qfmt = QFMT_VFS_V0;
1204set_qf_format:
1205 if ((sb_any_quota_enabled(sb) ||
1206 sb_any_quota_suspended(sb)) &&
1207 sbi->s_jquota_fmt != qfmt) {
1208 printk(KERN_ERR "EXT4-fs: Cannot change "
1209 "journaled quota options when "
1210 "quota turned on.\n");
1211 return 0;
1212 }
1213 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1214 break;
1215 case Opt_quota:
1216 case Opt_usrquota:
1217 set_opt(sbi->s_mount_opt, QUOTA);
1218 set_opt(sbi->s_mount_opt, USRQUOTA);
1219 break;
1220 case Opt_grpquota:
1221 set_opt(sbi->s_mount_opt, QUOTA);
1222 set_opt(sbi->s_mount_opt, GRPQUOTA);
1223 break;
1224 case Opt_noquota:
1225 if (sb_any_quota_enabled(sb)) {
617ba13b 1226 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1227 "options when quota turned on.\n");
1228 return 0;
1229 }
1230 clear_opt(sbi->s_mount_opt, QUOTA);
1231 clear_opt(sbi->s_mount_opt, USRQUOTA);
1232 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1233 break;
1234#else
1235 case Opt_quota:
1236 case Opt_usrquota:
1237 case Opt_grpquota:
cd59e7b9
JK		 1238 printk(KERN_ERR
1239 "EXT4-fs: quota options not supported.\n");
1240 break;
ac27a0ec
DK		 1241 case Opt_usrjquota:
1242 case Opt_grpjquota:
1243 case Opt_offusrjquota:
1244 case Opt_offgrpjquota:
1245 case Opt_jqfmt_vfsold:
1246 case Opt_jqfmt_vfsv0:
1247 printk(KERN_ERR
cd59e7b9 1248 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1249 "supported.\n");
1250 break;
1251 case Opt_noquota:
1252 break;
1253#endif
1254 case Opt_abort:
1255 set_opt(sbi->s_mount_opt, ABORT);
1256 break;
1257 case Opt_barrier:
1258 if (match_int(&args[0], &option))
1259 return 0;
1260 if (option)
1261 set_opt(sbi->s_mount_opt, BARRIER);
1262 else
1263 clear_opt(sbi->s_mount_opt, BARRIER);
1264 break;
1265 case Opt_ignore:
1266 break;
1267 case Opt_resize:
1268 if (!is_remount) {
617ba13b 1269 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1270 "for remount\n");
1271 return 0;
1272 }
1273 if (match_int(&args[0], &option) != 0)
1274 return 0;
1275 *n_blocks_count = option;
1276 break;
1277 case Opt_nobh:
1278 set_opt(sbi->s_mount_opt, NOBH);
1279 break;
1280 case Opt_bh:
1281 clear_opt(sbi->s_mount_opt, NOBH);
1282 break;
a86c6181 1283 case Opt_extents:
e4079a11
ES		 1284 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1285 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1286 ext4_warning(sb, __func__,
1287 "extents feature not enabled "
1288 "on this filesystem, use tune2fs\n");
1289 return 0;
1290 }
2b2d6d01 1291 set_opt(sbi->s_mount_opt, EXTENTS);
a86c6181 1292 break;
1e2462f9 1293 case Opt_noextents:
c07651b5
AK		 1294 /*
1295 * When e2fsprogs support resizing an already existing
1296 * ext3 file system to greater than 2**32 we need to
1297 * add support to block allocator to handle growing
1298 * already existing block mapped inode so that blocks
1299 * allocated for them fall within 2**32
1300 */
1301 last_block = ext4_blocks_count(sbi->s_es) - 1;
1302 if (last_block > 0xffffffffULL) {
1303 printk(KERN_ERR "EXT4-fs: Filesystem too "
1304 "large to mount with "
1305 "-o noextents options\n");
1306 return 0;
1307 }
2b2d6d01 1308 clear_opt(sbi->s_mount_opt, EXTENTS);
1e2462f9 1309 break;
25ec56b5
JNC		 1310 case Opt_i_version:
1311 set_opt(sbi->s_mount_opt, I_VERSION);
1312 sb->s_flags |= MS_I_VERSION;
1313 break;
dd919b98
AK		 1314 case Opt_nodelalloc:
1315 clear_opt(sbi->s_mount_opt, DELALLOC);
1316 break;
c9de560d
AT		 1317 case Opt_stripe:
1318 if (match_int(&args[0], &option))
1319 return 0;
1320 if (option < 0)
1321 return 0;
1322 sbi->s_stripe = option;
1323 break;
64769240
AT		 1324 case Opt_delalloc:
1325 set_opt(sbi->s_mount_opt, DELALLOC);
1326 break;
240799cd
TT		 1327 case Opt_inode_readahead_blks:
1328 if (match_int(&args[0], &option))
1329 return 0;
1330 if (option < 0 || option > (1 << 30))
1331 return 0;
1332 sbi->s_inode_readahead_blks = option;
1333 break;
ac27a0ec 1334 default:
2b2d6d01
TT		 1335 printk(KERN_ERR
1336 "EXT4-fs: Unrecognized mount option \"%s\" "
1337 "or missing value\n", p);
ac27a0ec
DK		 1338 return 0;
1339 }
1340 }
1341#ifdef CONFIG_QUOTA
1342 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1343 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1344 sbi->s_qf_names[USRQUOTA])
1345 clear_opt(sbi->s_mount_opt, USRQUOTA);
1346
617ba13b 1347 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1348 sbi->s_qf_names[GRPQUOTA])
1349 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1350
1351 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1352 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1353 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1354 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1355 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1356 "format mixing.\n");
1357 return 0;
1358 }
1359
1360 if (!sbi->s_jquota_fmt) {
2c8be6b2 1361 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1362 "not specified.\n");
1363 return 0;
1364 }
1365 } else {
1366 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1367 printk(KERN_ERR "EXT4-fs: journaled quota format "
1368 "specified with no journaling "
ac27a0ec
DK		 1369 "enabled.\n");
1370 return 0;
1371 }
1372 }
1373#endif
1374 return 1;
1375}
1376
617ba13b 1377static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1378 int read_only)
1379{
617ba13b 1380 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1381 int res = 0;
1382
617ba13b 1383 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1384 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1385 "forcing read-only mode\n");
ac27a0ec
DK		 1386 res = MS_RDONLY;
1387 }
1388 if (read_only)
1389 return res;
617ba13b 1390 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1391 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1392 "running e2fsck is recommended\n");
617ba13b 1393 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1394 printk(KERN_WARNING
1395 "EXT4-fs warning: mounting fs with errors, "
1396 "running e2fsck is recommended\n");
ac27a0ec
DK		 1397 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1398 le16_to_cpu(es->s_mnt_count) >=
1399 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1400 printk(KERN_WARNING
1401 "EXT4-fs warning: maximal mount count reached, "
1402 "running e2fsck is recommended\n");
ac27a0ec
DK		 1403 else if (le32_to_cpu(es->s_checkinterval) &&
1404 (le32_to_cpu(es->s_lastcheck) +
1405 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1406 printk(KERN_WARNING
1407 "EXT4-fs warning: checktime reached, "
1408 "running e2fsck is recommended\n");
ac27a0ec
DK		 1409#if 0
1410 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1411 * inconsistencies, to force a fsck at reboot. But for
1412 * a plain journaled filesystem we can keep it set as
1413 * valid forever! :)
1414 */
216c34b2 1415 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec
DK		 1416#endif
1417 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1418 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1419 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1420 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1421 ext4_update_dynamic_rev(sb);
1422 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1423
617ba13b 1424 ext4_commit_super(sb, es, 1);
ac27a0ec 1425 if (test_opt(sb, DEBUG))
617ba13b 1426 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1427 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1428 sb->s_blocksize,
1429 sbi->s_groups_count,
617ba13b
MC		 1430 EXT4_BLOCKS_PER_GROUP(sb),
1431 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1432 sbi->s_mount_opt);
1433
05496769
TT		 1434 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1435 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1436 "external", EXT4_SB(sb)->s_journal->j_devname);
ac27a0ec
DK		 1437 return res;
1438}
1439
772cb7c8
JS		 1440static int ext4_fill_flex_info(struct super_block *sb)
1441{
1442 struct ext4_sb_info *sbi = EXT4_SB(sb);
1443 struct ext4_group_desc *gdp = NULL;
1444 struct buffer_head *bh;
1445 ext4_group_t flex_group_count;
1446 ext4_group_t flex_group;
1447 int groups_per_flex = 0;
1448 __u64 block_bitmap = 0;
1449 int i;
1450
1451 if (!sbi->s_es->s_log_groups_per_flex) {
1452 sbi->s_log_groups_per_flex = 0;
1453 return 1;
1454 }
1455
1456 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1457 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1458
c62a11fd
FB		 1459 /* We allocate both existing and potentially added groups */
1460 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1461 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1462 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1463 groups_per_flex;
ec05e868 1464 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1465 sizeof(struct flex_groups), GFP_KERNEL);
1466 if (sbi->s_flex_groups == NULL) {
ec05e868
LZ		 1467 printk(KERN_ERR "EXT4-fs: not enough memory for "
1468 "%lu flex groups\n", flex_group_count);
772cb7c8
JS		 1469 goto failed;
1470 }
772cb7c8
JS		 1471
1472 gdp = ext4_get_group_desc(sb, 1, &bh);
1473 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1474
1475 for (i = 0; i < sbi->s_groups_count; i++) {
1476 gdp = ext4_get_group_desc(sb, i, &bh);
1477
1478 flex_group = ext4_flex_group(sbi, i);
1479 sbi->s_flex_groups[flex_group].free_inodes +=
1480 le16_to_cpu(gdp->bg_free_inodes_count);
1481 sbi->s_flex_groups[flex_group].free_blocks +=
1482 le16_to_cpu(gdp->bg_free_blocks_count);
1483 }
1484
1485 return 1;
1486failed:
1487 return 0;
1488}
1489
717d50e4
AD		 1490__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1491 struct ext4_group_desc *gdp)
1492{
1493 __u16 crc = 0;
1494
1495 if (sbi->s_es->s_feature_ro_compat &
1496 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1497 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1498 __le32 le_group = cpu_to_le32(block_group);
1499
1500 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1501 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1502 crc = crc16(crc, (__u8 *)gdp, offset);
1503 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1504 /* for checksum of struct ext4_group_desc do the rest...*/
1505 if ((sbi->s_es->s_feature_incompat &
1506 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1507 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1508 crc = crc16(crc, (__u8 *)gdp + offset,
1509 le16_to_cpu(sbi->s_es->s_desc_size) -
1510 offset);
1511 }
1512
1513 return cpu_to_le16(crc);
1514}
1515
1516int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1517 struct ext4_group_desc *gdp)
1518{
1519 if ((sbi->s_es->s_feature_ro_compat &
1520 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1521 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1522 return 0;
1523
1524 return 1;
1525}
1526
ac27a0ec 1527/* Called at mount-time, super-block is locked */
197cd65a 1528static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1529{
617ba13b
MC		 1530 struct ext4_sb_info *sbi = EXT4_SB(sb);
1531 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1532 ext4_fsblk_t last_block;
bd81d8ee
LV		 1533 ext4_fsblk_t block_bitmap;
1534 ext4_fsblk_t inode_bitmap;
1535 ext4_fsblk_t inode_table;
ce421581 1536 int flexbg_flag = 0;
fd2d4291 1537 ext4_group_t i;
ac27a0ec 1538
ce421581
JS		 1539 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1540 flexbg_flag = 1;
1541
af5bc92d 1542 ext4_debug("Checking group descriptors");
ac27a0ec 1543
197cd65a
AM		 1544 for (i = 0; i < sbi->s_groups_count; i++) {
1545 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1546
ce421581 1547 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1548 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1549 else
1550 last_block = first_block +
617ba13b 1551 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1552
8fadc143 1553 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1554 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0
JB		 1555 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1556 "Block bitmap for group %lu not in group "
5128273a 1557 "(block %llu)!\n", i, block_bitmap);
ac27a0ec
DK		 1558 return 0;
1559 }
8fadc143 1560 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1561 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0
JB		 1562 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1563 "Inode bitmap for group %lu not in group "
5128273a 1564 "(block %llu)!\n", i, inode_bitmap);
ac27a0ec
DK		 1565 return 0;
1566 }
8fadc143 1567 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1568 if (inode_table < first_block ||
2b2d6d01 1569 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0
JB		 1570 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1571 "Inode table for group %lu not in group "
5128273a 1572 "(block %llu)!\n", i, inode_table);
ac27a0ec
DK		 1573 return 0;
1574 }
b5f10eed 1575 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1576 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0
JB		 1577 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1578 "Checksum for group %lu failed (%u!=%u)\n",
1579 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1580 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c
LZ		 1581 if (!(sb->s_flags & MS_RDONLY)) {
1582 spin_unlock(sb_bgl_lock(sbi, i));
8a266467 1583 return 0;
7ee1ec4c 1584 }
717d50e4 1585 }
b5f10eed 1586 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1587 if (!flexbg_flag)
1588 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1589 }
1590
bd81d8ee 1591 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1592 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1593 return 1;
1594}
1595
617ba13b 1596/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1597 * the superblock) which were deleted from all directories, but held open by
1598 * a process at the time of a crash. We walk the list and try to delete these
1599 * inodes at recovery time (only with a read-write filesystem).
1600 *
1601 * In order to keep the orphan inode chain consistent during traversal (in
1602 * case of crash during recovery), we link each inode into the superblock
1603 * orphan list_head and handle it the same way as an inode deletion during
1604 * normal operation (which journals the operations for us).
1605 *
1606 * We only do an iget() and an iput() on each inode, which is very safe if we
1607 * accidentally point at an in-use or already deleted inode. The worst that
1608 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1609 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1610 * e2fsck was run on this filesystem, and it must have already done the orphan
1611 * inode cleanup for us, so we can safely abort without any further action.
1612 */
2b2d6d01
TT		 1613static void ext4_orphan_cleanup(struct super_block *sb,
1614 struct ext4_super_block *es)
ac27a0ec
DK		 1615{
1616 unsigned int s_flags = sb->s_flags;
1617 int nr_orphans = 0, nr_truncates = 0;
1618#ifdef CONFIG_QUOTA
1619 int i;
1620#endif
1621 if (!es->s_last_orphan) {
1622 jbd_debug(4, "no orphan inodes to clean up\n");
1623 return;
1624 }
1625
a8f48a95
ES		 1626 if (bdev_read_only(sb->s_bdev)) {
1627 printk(KERN_ERR "EXT4-fs: write access "
1628 "unavailable, skipping orphan cleanup.\n");
1629 return;
1630 }
1631
617ba13b 1632 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1633 if (es->s_last_orphan)
1634 jbd_debug(1, "Errors on filesystem, "
1635 "clearing orphan list.\n");
1636 es->s_last_orphan = 0;
1637 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1638 return;
1639 }
1640
1641 if (s_flags & MS_RDONLY) {
617ba13b 1642 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1643 sb->s_id);
1644 sb->s_flags &= ~MS_RDONLY;
1645 }
1646#ifdef CONFIG_QUOTA
1647 /* Needed for iput() to work correctly and not trash data */
1648 sb->s_flags |= MS_ACTIVE;
1649 /* Turn on quotas so that they are updated correctly */
1650 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1651 if (EXT4_SB(sb)->s_qf_names[i]) {
1652 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1653 if (ret < 0)
1654 printk(KERN_ERR
2c8be6b2 1655 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1656 "quota: error %d\n", ret);
1657 }
1658 }
1659#endif
1660
1661 while (es->s_last_orphan) {
1662 struct inode *inode;
1663
97bd42b9
JB		 1664 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1665 if (IS_ERR(inode)) {
ac27a0ec
DK		 1666 es->s_last_orphan = 0;
1667 break;
1668 }
1669
617ba13b 1670 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1671 DQUOT_INIT(inode);
1672 if (inode->i_nlink) {
1673 printk(KERN_DEBUG
e5f8eab8 1674 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1675 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1676 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1677 inode->i_ino, inode->i_size);
617ba13b 1678 ext4_truncate(inode);
ac27a0ec
DK		 1679 nr_truncates++;
1680 } else {
1681 printk(KERN_DEBUG
1682 "%s: deleting unreferenced inode %lu\n",
46e665e9 1683 __func__, inode->i_ino);
ac27a0ec
DK		 1684 jbd_debug(2, "deleting unreferenced inode %lu\n",
1685 inode->i_ino);
1686 nr_orphans++;
1687 }
1688 iput(inode); /* The delete magic happens here! */
1689 }
1690
2b2d6d01 1691#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1692
1693 if (nr_orphans)
617ba13b 1694 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1695 sb->s_id, PLURAL(nr_orphans));
1696 if (nr_truncates)
617ba13b 1697 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1698 sb->s_id, PLURAL(nr_truncates));
1699#ifdef CONFIG_QUOTA
1700 /* Turn quotas off */
1701 for (i = 0; i < MAXQUOTAS; i++) {
1702 if (sb_dqopt(sb)->files[i])
6f28e087 1703 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1704 }
1705#endif
1706 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1707}
cd2291a4
ES		 1708/*
1709 * Maximal extent format file size.
1710 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1711 * extent format containers, within a sector_t, and within i_blocks
1712 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1713 * so that won't be a limiting factor.
1714 *
1715 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1716 */
f287a1a5 1717static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1718{
1719 loff_t res;
1720 loff_t upper_limit = MAX_LFS_FILESIZE;
1721
1722 /* small i_blocks in vfs inode? */
f287a1a5 1723 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4
ES		 1724 /*
1725 * CONFIG_LSF is not enabled implies the inode
1726 * i_block represent total blocks in 512 bytes
1727 * 32 == size of vfs inode i_blocks * 8
1728 */
1729 upper_limit = (1LL << 32) - 1;
1730
1731 /* total blocks in file system block size */
1732 upper_limit >>= (blkbits - 9);
1733 upper_limit <<= blkbits;
1734 }
1735
1736 /* 32-bit extent-start container, ee_block */
1737 res = 1LL << 32;
1738 res <<= blkbits;
1739 res -= 1;
1740
1741 /* Sanity check against vm- & vfs- imposed limits */
1742 if (res > upper_limit)
1743 res = upper_limit;
1744
1745 return res;
1746}
ac27a0ec 1747
ac27a0ec 1748/*
cd2291a4 1749 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1750 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1751 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1752 */
f287a1a5 1753static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 1754{
617ba13b 1755 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1756 int meta_blocks;
1757 loff_t upper_limit;
1758 /* This is calculated to be the largest file size for a
cd2291a4 1759 * dense, bitmapped file such that the total number of
ac27a0ec 1760 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1761 * does not exceed 2^48 -1
1762 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1763 * total number of 512 bytes blocks of the file
1764 */
1765
f287a1a5 1766 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 1767 /*
f287a1a5
TT		 1768 * !has_huge_files or CONFIG_LSF is not enabled
1769 * implies the inode i_block represent total blocks in
1770 * 512 bytes 32 == size of vfs inode i_blocks * 8
0fc1b451
AK		 1771 */
1772 upper_limit = (1LL << 32) - 1;
1773
1774 /* total blocks in file system block size */
1775 upper_limit >>= (bits - 9);
1776
1777 } else {
8180a562
AK		 1778 /*
1779 * We use 48 bit ext4_inode i_blocks
1780 * With EXT4_HUGE_FILE_FL set the i_blocks
1781 * represent total number of blocks in
1782 * file system block size
1783 */
0fc1b451
AK		 1784 upper_limit = (1LL << 48) - 1;
1785
0fc1b451
AK		 1786 }
1787
1788 /* indirect blocks */
1789 meta_blocks = 1;
1790 /* double indirect blocks */
1791 meta_blocks += 1 + (1LL << (bits-2));
1792 /* tripple indirect blocks */
1793 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1794
1795 upper_limit -= meta_blocks;
1796 upper_limit <<= bits;
ac27a0ec
DK		 1797
1798 res += 1LL << (bits-2);
1799 res += 1LL << (2*(bits-2));
1800 res += 1LL << (3*(bits-2));
1801 res <<= bits;
1802 if (res > upper_limit)
1803 res = upper_limit;
0fc1b451
AK		 1804
1805 if (res > MAX_LFS_FILESIZE)
1806 res = MAX_LFS_FILESIZE;
1807
ac27a0ec
DK		 1808 return res;
1809}
1810
617ba13b 1811static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1812 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1813{
617ba13b 1814 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1815 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1816 int has_super = 0;
1817
1818 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1819
617ba13b 1820 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1821 nr < first_meta_bg)
70bbb3e0 1822 return logical_sb_block + nr + 1;
ac27a0ec 1823 bg = sbi->s_desc_per_block * nr;
617ba13b 1824 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1825 has_super = 1;
617ba13b 1826 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1827}
1828
c9de560d
AT		 1829/**
1830 * ext4_get_stripe_size: Get the stripe size.
1831 * @sbi: In memory super block info
1832 *
1833 * If we have specified it via mount option, then
1834 * use the mount option value. If the value specified at mount time is
1835 * greater than the blocks per group use the super block value.
1836 * If the super block value is greater than blocks per group return 0.
1837 * Allocator needs it be less than blocks per group.
1838 *
1839 */
1840static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1841{
1842 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1843 unsigned long stripe_width =
1844 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1845
1846 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1847 return sbi->s_stripe;
1848
1849 if (stripe_width <= sbi->s_blocks_per_group)
1850 return stripe_width;
1851
1852 if (stride <= sbi->s_blocks_per_group)
1853 return stride;
1854
1855 return 0;
1856}
ac27a0ec 1857
2b2d6d01 1858static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 1859 __releases(kernel_lock)
1860 __acquires(kernel_lock)
1d03ec98 1861
ac27a0ec 1862{
2b2d6d01 1863 struct buffer_head *bh;
617ba13b
MC		 1864 struct ext4_super_block *es = NULL;
1865 struct ext4_sb_info *sbi;
1866 ext4_fsblk_t block;
1867 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1868 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1869 unsigned long offset = 0;
1870 unsigned int journal_inum = 0;
1871 unsigned long journal_devnum = 0;
1872 unsigned long def_mount_opts;
1873 struct inode *root;
9f6200bb 1874 char *cp;
1d1fe1ee 1875 int ret = -EINVAL;
ac27a0ec 1876 int blocksize;
ac27a0ec
DK		 1877 int db_count;
1878 int i;
f287a1a5 1879 int needs_recovery, has_huge_files;
ac27a0ec 1880 __le32 features;
bd81d8ee 1881 __u64 blocks_count;
833f4077 1882 int err;
ac27a0ec
DK		 1883
1884 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1885 if (!sbi)
1886 return -ENOMEM;
1887 sb->s_fs_info = sbi;
1888 sbi->s_mount_opt = 0;
617ba13b
MC		 1889 sbi->s_resuid = EXT4_DEF_RESUID;
1890 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 1891 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 1892 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1893
1894 unlock_kernel();
1895
9f6200bb
TT		 1896 /* Cleanup superblock name */
1897 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
1898 *cp = '!';
1899
617ba13b 1900 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1901 if (!blocksize) {
617ba13b 1902 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1903 goto out_fail;
1904 }
1905
1906 /*
617ba13b 1907 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1908 * block sizes. We need to calculate the offset from buffer start.
1909 */
617ba13b 1910 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1911 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1912 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1913 } else {
70bbb3e0 1914 logical_sb_block = sb_block;
ac27a0ec
DK		 1915 }
1916
70bbb3e0 1917 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 1918 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1919 goto out_fail;
1920 }
1921 /*
1922 * Note: s_es must be initialized as soon as possible because
617ba13b 1923 * some ext4 macro-instructions depend on its value
ac27a0ec 1924 */
617ba13b 1925 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1926 sbi->s_es = es;
1927 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1928 if (sb->s_magic != EXT4_SUPER_MAGIC)
1929 goto cantfind_ext4;
ac27a0ec
DK		 1930
1931 /* Set defaults before we parse the mount options */
1932 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1933 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1934 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1935 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1936 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1937 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1938 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 1939#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 1940 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1941 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 1942#endif
03010a33 1943#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 1944 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1945 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1946#endif
617ba13b
MC		 1947 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1948 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1949 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1950 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1951 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1952 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1953
1954 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1955 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1956 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1957 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 1958 else
1959 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1960
1961 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1962 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1963
1964 set_opt(sbi->s_mount_opt, RESERVATION);
571640ca 1965 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 1966
1e2462f9
MC		 1967 /*
1968 * turn on extents feature by default in ext4 filesystem
e4079a11
ES		 1969 * only if feature flag already set by mkfs or tune2fs.
1970 * Use -o noextents to turn it off
1e2462f9 1971 */
e4079a11
ES		 1972 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
1973 set_opt(sbi->s_mount_opt, EXTENTS);
1974 else
1975 ext4_warning(sb, __func__,
1976 "extents feature not enabled on this filesystem, "
1977 "use tune2fs.\n");
1e2462f9 1978
dd919b98
AK		 1979 /*
1980 * enable delayed allocation by default
1981 * Use -o nodelalloc to turn it off
1982 */
1983 set_opt(sbi->s_mount_opt, DELALLOC);
1984
1985
2b2d6d01
TT		 1986 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
1987 NULL, 0))
ac27a0ec
DK		 1988 goto failed_mount;
1989
1990 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 1991 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 1992
617ba13b
MC		 1993 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1994 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1995 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1996 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 1997 printk(KERN_WARNING
617ba13b 1998 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 1999 "running e2fsck is recommended\n");
469108ff 2000
ac27a0ec
DK		 2001 /*
2002 * Check feature flags regardless of the revision level, since we
2003 * previously didn't change the revision level when setting the flags,
2004 * so there is a chance incompat flags are set on a rev 0 filesystem.
2005 */
617ba13b 2006 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2007 if (features) {
617ba13b 2008 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 2009 "unsupported optional features (%x).\n",
2010 sb->s_id, le32_to_cpu(features));
2011 goto failed_mount;
2012 }
617ba13b 2013 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2014 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2015 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 2016 "unsupported optional features (%x).\n",
2017 sb->s_id, le32_to_cpu(features));
2018 goto failed_mount;
2019 }
f287a1a5
TT		 2020 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2021 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2022 if (has_huge_files) {
0fc1b451
AK		 2023 /*
2024 * Large file size enabled file system can only be
2025 * mount if kernel is build with CONFIG_LSF
2026 */
2027 if (sizeof(root->i_blocks) < sizeof(u64) &&
2028 !(sb->s_flags & MS_RDONLY)) {
2029 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2030 "files cannot be mounted read-write "
2031 "without CONFIG_LSF.\n", sb->s_id);
2032 goto failed_mount;
2033 }
2034 }
ac27a0ec
DK		 2035 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2036
617ba13b
MC		 2037 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2038 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2039 printk(KERN_ERR
617ba13b 2040 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2041 blocksize, sb->s_id);
2042 goto failed_mount;
2043 }
2044
ac27a0ec 2045 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2046
2047 /* Validate the filesystem blocksize */
2048 if (!sb_set_blocksize(sb, blocksize)) {
2049 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2050 blocksize);
ac27a0ec
DK		 2051 goto failed_mount;
2052 }
2053
2b2d6d01 2054 brelse(bh);
70bbb3e0
AM		 2055 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2056 offset = do_div(logical_sb_block, blocksize);
2057 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2058 if (!bh) {
2059 printk(KERN_ERR
617ba13b 2060 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2061 goto failed_mount;
2062 }
617ba13b 2063 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2064 sbi->s_es = es;
617ba13b 2065 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2066 printk(KERN_ERR
2067 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2068 goto failed_mount;
2069 }
2070 }
2071
f287a1a5
TT		 2072 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2073 has_huge_files);
2074 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2075
617ba13b
MC		 2076 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2077 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2078 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2079 } else {
2080 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2081 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2082 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2083 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2084 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2085 printk(KERN_ERR
2086 "EXT4-fs: unsupported inode size: %d\n",
2087 sbi->s_inode_size);
ac27a0ec
DK		 2088 goto failed_mount;
2089 }
ef7f3835
KS		 2090 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2091 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2092 }
0d1ee42f
AR		 2093 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2094 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2095 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2096 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2097 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2098 printk(KERN_ERR
8fadc143 2099 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2100 sbi->s_desc_size);
2101 goto failed_mount;
2102 }
2103 } else
2104 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2105 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2106 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2107 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2108 goto cantfind_ext4;
2109 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2110 if (sbi->s_inodes_per_block == 0)
617ba13b 2111 goto cantfind_ext4;
ac27a0ec
DK		 2112 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2113 sbi->s_inodes_per_block;
0d1ee42f 2114 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2115 sbi->s_sbh = bh;
2116 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2117 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2118 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2119 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2120 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2121 sbi->s_def_hash_version = es->s_def_hash_version;
2122
2123 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2124 printk(KERN_ERR
2125 "EXT4-fs: #blocks per group too big: %lu\n",
2126 sbi->s_blocks_per_group);
ac27a0ec
DK		 2127 goto failed_mount;
2128 }
ac27a0ec 2129 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2130 printk(KERN_ERR
2131 "EXT4-fs: #inodes per group too big: %lu\n",
2132 sbi->s_inodes_per_group);
ac27a0ec
DK		 2133 goto failed_mount;
2134 }
2135
bd81d8ee 2136 if (ext4_blocks_count(es) >
ac27a0ec 2137 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2138 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2139 " too large to mount safely\n", sb->s_id);
2140 if (sizeof(sector_t) < 8)
617ba13b 2141 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2142 "enabled\n");
2143 goto failed_mount;
2144 }
2145
617ba13b
MC		 2146 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2147 goto cantfind_ext4;
e7c95593
ES		 2148
2149 /* ensure blocks_count calculation below doesn't sign-extend */
2150 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2151 le32_to_cpu(es->s_first_data_block) + 1) {
2152 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2153 "first data block %u, blocks per group %lu\n",
2154 ext4_blocks_count(es),
2155 le32_to_cpu(es->s_first_data_block),
2156 EXT4_BLOCKS_PER_GROUP(sb));
2157 goto failed_mount;
2158 }
bd81d8ee
LV		 2159 blocks_count = (ext4_blocks_count(es) -
2160 le32_to_cpu(es->s_first_data_block) +
2161 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2162 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2163 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2164 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2165 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2166 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2167 GFP_KERNEL);
2168 if (sbi->s_group_desc == NULL) {
2b2d6d01 2169 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2170 goto failed_mount;
2171 }
2172
3244fcb1 2173#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2174 if (ext4_proc_root)
2175 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2176
240799cd
TT		 2177 if (sbi->s_proc)
2178 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2179 &ext4_ui_proc_fops,
2180 &sbi->s_inode_readahead_blks);
3244fcb1 2181#endif
240799cd 2182
ac27a0ec
DK		 2183 bgl_lock_init(&sbi->s_blockgroup_lock);
2184
2185 for (i = 0; i < db_count; i++) {
70bbb3e0 2186 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2187 sbi->s_group_desc[i] = sb_bread(sb, block);
2188 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2189 printk(KERN_ERR "EXT4-fs: "
2190 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2191 db_count = i;
2192 goto failed_mount2;
2193 }
2194 }
2b2d6d01 2195 if (!ext4_check_descriptors(sb)) {
617ba13b 2196 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2197 goto failed_mount2;
2198 }
772cb7c8
JS		 2199 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2200 if (!ext4_fill_flex_info(sb)) {
2201 printk(KERN_ERR
2202 "EXT4-fs: unable to initialize "
2203 "flex_bg meta info!\n");
2204 goto failed_mount2;
2205 }
2206
ac27a0ec
DK		 2207 sbi->s_gdb_count = db_count;
2208 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2209 spin_lock_init(&sbi->s_next_gen_lock);
2210
833f4077
PZ		 2211 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2212 ext4_count_free_blocks(sb));
2213 if (!err) {
2214 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2215 ext4_count_free_inodes(sb));
2216 }
2217 if (!err) {
2218 err = percpu_counter_init(&sbi->s_dirs_counter,
2219 ext4_count_dirs(sb));
2220 }
6bc6e63f
AK		 2221 if (!err) {
2222 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2223 }
833f4077
PZ		 2224 if (err) {
2225 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2226 goto failed_mount3;
2227 }
ac27a0ec 2228
c9de560d
AT		 2229 sbi->s_stripe = ext4_get_stripe_size(sbi);
2230
ac27a0ec
DK		 2231 /*
2232 * set up enough so that it can read an inode
2233 */
617ba13b
MC		 2234 sb->s_op = &ext4_sops;
2235 sb->s_export_op = &ext4_export_ops;
2236 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2237#ifdef CONFIG_QUOTA
617ba13b
MC		 2238 sb->s_qcop = &ext4_qctl_operations;
2239 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2240#endif
2241 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2242
2243 sb->s_root = NULL;
2244
2245 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2246 EXT4_HAS_INCOMPAT_FEATURE(sb,
2247 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2248
2249 /*
2250 * The first inode we look at is the journal inode. Don't try
2251 * root first: it may be modified in the journal!
2252 */
2253 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2254 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2255 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2256 goto failed_mount3;
624080ed
TT		 2257 if (!(sb->s_flags & MS_RDONLY) &&
2258 EXT4_SB(sb)->s_journal->j_failed_commit) {
2259 printk(KERN_CRIT "EXT4-fs error (device %s): "
2260 "ext4_fill_super: Journal transaction "
2b2d6d01 2261 "%u is corrupt\n", sb->s_id,
624080ed 2262 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2263 if (test_opt(sb, ERRORS_RO)) {
2264 printk(KERN_CRIT
2265 "Mounting filesystem read-only\n");
624080ed
TT		 2266 sb->s_flags |= MS_RDONLY;
2267 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2268 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2269 }
2270 if (test_opt(sb, ERRORS_PANIC)) {
2271 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2272 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2273 ext4_commit_super(sb, es, 1);
2274 printk(KERN_CRIT
2275 "EXT4-fs (device %s): mount failed\n",
2276 sb->s_id);
2277 goto failed_mount4;
2278 }
2279 }
ac27a0ec 2280 } else if (journal_inum) {
617ba13b 2281 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2282 goto failed_mount3;
2283 } else {
2284 if (!silent)
2b2d6d01
TT		 2285 printk(KERN_ERR
2286 "ext4: No journal on filesystem on %s\n",
2287 sb->s_id);
ac27a0ec
DK		 2288 goto failed_mount3;
2289 }
2290
eb40a09c
JS		 2291 if (ext4_blocks_count(es) > 0xffffffffULL &&
2292 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2293 JBD2_FEATURE_INCOMPAT_64BIT)) {
2294 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2295 goto failed_mount4;
2296 }
2297
818d276c
GS		 2298 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2299 jbd2_journal_set_features(sbi->s_journal,
2300 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2301 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2302 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2303 jbd2_journal_set_features(sbi->s_journal,
2304 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2305 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2306 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2307 } else {
2308 jbd2_journal_clear_features(sbi->s_journal,
2309 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2310 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2311 }
2312
ac27a0ec
DK		 2313 /* We have now updated the journal if required, so we can
2314 * validate the data journaling mode. */
2315 switch (test_opt(sb, DATA_FLAGS)) {
2316 case 0:
2317 /* No mode set, assume a default based on the journal
63f57933
AM		 2318 * capabilities: ORDERED_DATA if the journal can
2319 * cope, else JOURNAL_DATA
2320 */
dab291af
MC		 2321 if (jbd2_journal_check_available_features
2322 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2323 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2324 else
2325 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2326 break;
2327
617ba13b
MC		 2328 case EXT4_MOUNT_ORDERED_DATA:
2329 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2330 if (!jbd2_journal_check_available_features
2331 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2332 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2333 "requested data journaling mode\n");
2334 goto failed_mount4;
2335 }
2336 default:
2337 break;
2338 }
2339
2340 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2341 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2342 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2343 "its supported only with writeback mode\n");
2344 clear_opt(sbi->s_mount_opt, NOBH);
2345 }
2346 }
2347 /*
dab291af 2348 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2349 * so we can safely mount the rest of the filesystem now.
2350 */
2351
1d1fe1ee
DH		 2352 root = ext4_iget(sb, EXT4_ROOT_INO);
2353 if (IS_ERR(root)) {
617ba13b 2354 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2355 ret = PTR_ERR(root);
ac27a0ec
DK		 2356 goto failed_mount4;
2357 }
2358 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2359 iput(root);
617ba13b 2360 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2361 goto failed_mount4;
2362 }
1d1fe1ee
DH		 2363 sb->s_root = d_alloc_root(root);
2364 if (!sb->s_root) {
2365 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2366 iput(root);
2367 ret = -ENOMEM;
2368 goto failed_mount4;
2369 }
ac27a0ec 2370
2b2d6d01 2371 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2372
2373 /* determine the minimum size of new large inodes, if present */
2374 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2375 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2376 EXT4_GOOD_OLD_INODE_SIZE;
2377 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2378 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2379 if (sbi->s_want_extra_isize <
2380 le16_to_cpu(es->s_want_extra_isize))
2381 sbi->s_want_extra_isize =
2382 le16_to_cpu(es->s_want_extra_isize);
2383 if (sbi->s_want_extra_isize <
2384 le16_to_cpu(es->s_min_extra_isize))
2385 sbi->s_want_extra_isize =
2386 le16_to_cpu(es->s_min_extra_isize);
2387 }
2388 }
2389 /* Check if enough inode space is available */
2390 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2391 sbi->s_inode_size) {
2392 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2393 EXT4_GOOD_OLD_INODE_SIZE;
2394 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2395 "available.\n");
2396 }
2397
c2774d84
AK		 2398 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2399 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2400 "requested data journaling mode\n");
2401 clear_opt(sbi->s_mount_opt, DELALLOC);
2402 } else if (test_opt(sb, DELALLOC))
2403 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2404
2405 ext4_ext_init(sb);
2406 err = ext4_mb_init(sb, needs_recovery);
2407 if (err) {
2408 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2409 err);
2410 goto failed_mount4;
2411 }
2412
ac27a0ec
DK		 2413 /*
2414 * akpm: core read_super() calls in here with the superblock locked.
2415 * That deadlocks, because orphan cleanup needs to lock the superblock
2416 * in numerous places. Here we just pop the lock - it's relatively
2417 * harmless, because we are now ready to accept write_super() requests,
2418 * and aviro says that's the only reason for hanging onto the
2419 * superblock lock.
2420 */
617ba13b
MC		 2421 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2422 ext4_orphan_cleanup(sb, es);
2423 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2424 if (needs_recovery)
2b2d6d01 2425 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
617ba13b 2426 ext4_mark_recovery_complete(sb, es);
2b2d6d01
TT		 2427 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2428 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2429 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2430 "writeback");
ac27a0ec
DK		 2431
2432 lock_kernel();
2433 return 0;
2434
617ba13b 2435cantfind_ext4:
ac27a0ec 2436 if (!silent)
617ba13b 2437 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2438 sb->s_id);
2439 goto failed_mount;
2440
2441failed_mount4:
dab291af 2442 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 2443 sbi->s_journal = NULL;
ac27a0ec
DK		 2444failed_mount3:
2445 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2446 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2447 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2448 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2449failed_mount2:
2450 for (i = 0; i < db_count; i++)
2451 brelse(sbi->s_group_desc[i]);
2452 kfree(sbi->s_group_desc);
2453failed_mount:
240799cd
TT		 2454 if (sbi->s_proc) {
2455 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
9f6200bb 2456 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2457 }
ac27a0ec
DK		 2458#ifdef CONFIG_QUOTA
2459 for (i = 0; i < MAXQUOTAS; i++)
2460 kfree(sbi->s_qf_names[i]);
2461#endif
617ba13b 2462 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2463 brelse(bh);
2464out_fail:
2465 sb->s_fs_info = NULL;
2466 kfree(sbi);
2467 lock_kernel();
1d1fe1ee 2468 return ret;
ac27a0ec
DK		 2469}
2470
2471/*
2472 * Setup any per-fs journal parameters now. We'll do this both on
2473 * initial mount, once the journal has been initialised but before we've
2474 * done any recovery; and again on any subsequent remount.
2475 */
617ba13b 2476static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2477{
617ba13b 2478 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2479
2480 if (sbi->s_commit_interval)
2481 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2482 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2483 * interval here, but for now we'll just fall back to the jbd
2484 * default. */
2485
2486 spin_lock(&journal->j_state_lock);
2487 if (test_opt(sb, BARRIER))
dab291af 2488 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2489 else
dab291af 2490 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 2491 if (test_opt(sb, DATA_ERR_ABORT))
2492 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2493 else
2494 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 2495 spin_unlock(&journal->j_state_lock);
2496}
2497
617ba13b 2498static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2499 unsigned int journal_inum)
2500{
2501 struct inode *journal_inode;
2502 journal_t *journal;
2503
2504 /* First, test for the existence of a valid inode on disk. Bad
2505 * things happen if we iget() an unused inode, as the subsequent
2506 * iput() will try to delete it. */
2507
1d1fe1ee
DH		 2508 journal_inode = ext4_iget(sb, journal_inum);
2509 if (IS_ERR(journal_inode)) {
617ba13b 2510 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2511 return NULL;
2512 }
2513 if (!journal_inode->i_nlink) {
2514 make_bad_inode(journal_inode);
2515 iput(journal_inode);
617ba13b 2516 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2517 return NULL;
2518 }
2519
e5f8eab8 2520 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2521 journal_inode, journal_inode->i_size);
1d1fe1ee 2522 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2523 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2524 iput(journal_inode);
2525 return NULL;
2526 }
2527
dab291af 2528 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2529 if (!journal) {
617ba13b 2530 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2531 iput(journal_inode);
2532 return NULL;
2533 }
2534 journal->j_private = sb;
617ba13b 2535 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2536 return journal;
2537}
2538
617ba13b 2539static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2540 dev_t j_dev)
2541{
2b2d6d01 2542 struct buffer_head *bh;
ac27a0ec 2543 journal_t *journal;
617ba13b
MC		 2544 ext4_fsblk_t start;
2545 ext4_fsblk_t len;
ac27a0ec 2546 int hblock, blocksize;
617ba13b 2547 ext4_fsblk_t sb_block;
ac27a0ec 2548 unsigned long offset;
2b2d6d01 2549 struct ext4_super_block *es;
ac27a0ec
DK		 2550 struct block_device *bdev;
2551
617ba13b 2552 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2553 if (bdev == NULL)
2554 return NULL;
2555
2556 if (bd_claim(bdev, sb)) {
2557 printk(KERN_ERR
8c55e204 2558 "EXT4: failed to claim external journal device.\n");
9a1c3542 2559 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 2560 return NULL;
2561 }
2562
2563 blocksize = sb->s_blocksize;
2564 hblock = bdev_hardsect_size(bdev);
2565 if (blocksize < hblock) {
2566 printk(KERN_ERR
617ba13b 2567 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2568 goto out_bdev;
2569 }
2570
617ba13b
MC		 2571 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2572 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2573 set_blocksize(bdev, blocksize);
2574 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2575 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2576 "external journal\n");
2577 goto out_bdev;
2578 }
2579
617ba13b
MC		 2580 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2581 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2582 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2583 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2584 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2585 "bad superblock\n");
2586 brelse(bh);
2587 goto out_bdev;
2588 }
2589
617ba13b
MC		 2590 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2591 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2592 brelse(bh);
2593 goto out_bdev;
2594 }
2595
bd81d8ee 2596 len = ext4_blocks_count(es);
ac27a0ec
DK		 2597 start = sb_block + 1;
2598 brelse(bh); /* we're done with the superblock */
2599
dab291af 2600 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2601 start, len, blocksize);
2602 if (!journal) {
617ba13b 2603 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2604 goto out_bdev;
2605 }
2606 journal->j_private = sb;
2607 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2608 wait_on_buffer(journal->j_sb_buffer);
2609 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2610 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2611 goto out_journal;
2612 }
2613 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2614 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2615 "user (unsupported) - %d\n",
2616 be32_to_cpu(journal->j_superblock->s_nr_users));
2617 goto out_journal;
2618 }
617ba13b
MC		 2619 EXT4_SB(sb)->journal_bdev = bdev;
2620 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2621 return journal;
2622out_journal:
dab291af 2623 jbd2_journal_destroy(journal);
ac27a0ec 2624out_bdev:
617ba13b 2625 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2626 return NULL;
2627}
2628
617ba13b
MC		 2629static int ext4_load_journal(struct super_block *sb,
2630 struct ext4_super_block *es,
ac27a0ec
DK		 2631 unsigned long journal_devnum)
2632{
2633 journal_t *journal;
2634 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2635 dev_t journal_dev;
2636 int err = 0;
2637 int really_read_only;
2638
2639 if (journal_devnum &&
2640 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2641 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2642 "numbers have changed\n");
2643 journal_dev = new_decode_dev(journal_devnum);
2644 } else
2645 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2646
2647 really_read_only = bdev_read_only(sb->s_bdev);
2648
2649 /*
2650 * Are we loading a blank journal or performing recovery after a
2651 * crash? For recovery, we need to check in advance whether we
2652 * can get read-write access to the device.
2653 */
2654
617ba13b 2655 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2656 if (sb->s_flags & MS_RDONLY) {
617ba13b 2657 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2658 "required on readonly filesystem.\n");
2659 if (really_read_only) {
617ba13b 2660 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2661 "unavailable, cannot proceed.\n");
2662 return -EROFS;
2663 }
2b2d6d01
TT		 2664 printk(KERN_INFO "EXT4-fs: write access will "
2665 "be enabled during recovery.\n");
ac27a0ec
DK		 2666 }
2667 }
2668
2669 if (journal_inum && journal_dev) {
617ba13b 2670 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2671 "and inode journals!\n");
2672 return -EINVAL;
2673 }
2674
2675 if (journal_inum) {
617ba13b 2676 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2677 return -EINVAL;
2678 } else {
617ba13b 2679 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2680 return -EINVAL;
2681 }
2682
4776004f
TT		 2683 if (journal->j_flags & JBD2_BARRIER)
2684 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2685 else
2686 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2687
ac27a0ec 2688 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2689 err = jbd2_journal_update_format(journal);
ac27a0ec 2690 if (err) {
617ba13b 2691 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2692 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2693 return err;
2694 }
2695 }
2696
617ba13b 2697 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2698 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2699 if (!err)
dab291af 2700 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2701
2702 if (err) {
617ba13b 2703 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2704 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2705 return err;
2706 }
2707
617ba13b
MC		 2708 EXT4_SB(sb)->s_journal = journal;
2709 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2710
2711 if (journal_devnum &&
2712 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2713 es->s_journal_dev = cpu_to_le32(journal_devnum);
2714 sb->s_dirt = 1;
2715
2716 /* Make sure we flush the recovery flag to disk. */
617ba13b 2717 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2718 }
2719
2720 return 0;
2721}
2722
2b2d6d01
TT		 2723static int ext4_create_journal(struct super_block *sb,
2724 struct ext4_super_block *es,
ac27a0ec
DK		 2725 unsigned int journal_inum)
2726{
2727 journal_t *journal;
6c675bd4 2728 int err;
ac27a0ec
DK		 2729
2730 if (sb->s_flags & MS_RDONLY) {
617ba13b 2731 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2732 "create journal.\n");
2733 return -EROFS;
2734 }
2735
6c675bd4
BP		 2736 journal = ext4_get_journal(sb, journal_inum);
2737 if (!journal)
ac27a0ec
DK		 2738 return -EINVAL;
2739
617ba13b 2740 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2741 journal_inum);
2742
6c675bd4
BP		 2743 err = jbd2_journal_create(journal);
2744 if (err) {
617ba13b 2745 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2746 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2747 return -EIO;
2748 }
2749
617ba13b 2750 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2751
617ba13b
MC		 2752 ext4_update_dynamic_rev(sb);
2753 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2754 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2755
2756 es->s_journal_inum = cpu_to_le32(journal_inum);
2757 sb->s_dirt = 1;
2758
2759 /* Make sure we flush the recovery flag to disk. */
617ba13b 2760 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2761
2762 return 0;
2763}
2764
2b2d6d01
TT		 2765static void ext4_commit_super(struct super_block *sb,
2766 struct ext4_super_block *es, int sync)
ac27a0ec 2767{
617ba13b 2768 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2769
2770 if (!sbh)
2771 return;
914258bf
TT		 2772 if (buffer_write_io_error(sbh)) {
2773 /*
2774 * Oh, dear. A previous attempt to write the
2775 * superblock failed. This could happen because the
2776 * USB device was yanked out. Or it could happen to
2777 * be a transient write error and maybe the block will
2778 * be remapped. Nothing we can do but to retry the
2779 * write and hope for the best.
2780 */
2781 printk(KERN_ERR "ext4: previous I/O error to "
2782 "superblock detected for %s.\n", sb->s_id);
2783 clear_buffer_write_io_error(sbh);
2784 set_buffer_uptodate(sbh);
2785 }
ac27a0ec 2786 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2787 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2788 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2789 BUFFER_TRACE(sbh, "marking dirty");
2790 mark_buffer_dirty(sbh);
914258bf 2791 if (sync) {
ac27a0ec 2792 sync_dirty_buffer(sbh);
914258bf
TT		 2793 if (buffer_write_io_error(sbh)) {
2794 printk(KERN_ERR "ext4: I/O error while writing "
2795 "superblock for %s.\n", sb->s_id);
2796 clear_buffer_write_io_error(sbh);
2797 set_buffer_uptodate(sbh);
2798 }
2799 }
ac27a0ec
DK		 2800}
2801
2802
2803/*
2804 * Have we just finished recovery? If so, and if we are mounting (or
2805 * remounting) the filesystem readonly, then we will end up with a
2806 * consistent fs on disk. Record that fact.
2807 */
2b2d6d01
TT		 2808static void ext4_mark_recovery_complete(struct super_block *sb,
2809 struct ext4_super_block *es)
ac27a0ec 2810{
617ba13b 2811 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2812
dab291af 2813 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 2814 if (jbd2_journal_flush(journal) < 0)
2815 goto out;
2816
32c37730 2817 lock_super(sb);
617ba13b 2818 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2819 sb->s_flags & MS_RDONLY) {
617ba13b 2820 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2821 sb->s_dirt = 0;
617ba13b 2822 ext4_commit_super(sb, es, 1);
ac27a0ec 2823 }
32c37730 2824 unlock_super(sb);
7ffe1ea8
HK		 2825
2826out:
dab291af 2827 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2828}
2829
2830/*
2831 * If we are mounting (or read-write remounting) a filesystem whose journal
2832 * has recorded an error from a previous lifetime, move that error to the
2833 * main filesystem now.
2834 */
2b2d6d01
TT		 2835static void ext4_clear_journal_err(struct super_block *sb,
2836 struct ext4_super_block *es)
ac27a0ec
DK		 2837{
2838 journal_t *journal;
2839 int j_errno;
2840 const char *errstr;
2841
617ba13b 2842 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2843
2844 /*
2845 * Now check for any error status which may have been recorded in the
617ba13b 2846 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2847 */
2848
dab291af 2849 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2850 if (j_errno) {
2851 char nbuf[16];
2852
617ba13b 2853 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 2854 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 2855 "from previous mount: %s", errstr);
46e665e9 2856 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 2857 "filesystem check.");
2858
617ba13b
MC		 2859 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2860 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 2861 ext4_commit_super(sb, es, 1);
ac27a0ec 2862
dab291af 2863 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2864 }
2865}
2866
2867/*
2868 * Force the running and committing transactions to commit,
2869 * and wait on the commit.
2870 */
617ba13b 2871int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2872{
2873 journal_t *journal;
2874 int ret;
2875
2876 if (sb->s_flags & MS_RDONLY)
2877 return 0;
2878
617ba13b 2879 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2880 sb->s_dirt = 0;
617ba13b 2881 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2882 return ret;
2883}
2884
2885/*
617ba13b 2886 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2887 * have to propagate any other updates to the superblock on disk at this
2888 * point. Just start an async writeback to get the buffers on their way
2889 * to the disk.
2890 *
2891 * This implicitly triggers the writebehind on sync().
2892 */
2893
2b2d6d01 2894static void ext4_write_super(struct super_block *sb)
ac27a0ec
DK		 2895{
2896 if (mutex_trylock(&sb->s_lock) != 0)
2897 BUG();
2898 sb->s_dirt = 0;
2899}
2900
617ba13b 2901static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2902{
2903 tid_t target;
2904
ede86cc4 2905 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
ac27a0ec 2906 sb->s_dirt = 0;
dab291af 2907 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2908 if (wait)
dab291af 2909 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2910 }
2911 return 0;
2912}
2913
2914/*
2915 * LVM calls this function before a (read-only) snapshot is created. This
2916 * gives us a chance to flush the journal completely and mark the fs clean.
2917 */
617ba13b 2918static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2919{
2920 sb->s_dirt = 0;
2921
2922 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2923 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2924
2925 /* Now we set up the journal barrier. */
dab291af 2926 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 2927
2928 /*
2929 * We don't want to clear needs_recovery flag when we failed
2930 * to flush the journal.
2931 */
2932 if (jbd2_journal_flush(journal) < 0)
2933 return;
ac27a0ec
DK		 2934
2935 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2936 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2937 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2938 }
2939}
2940
2941/*
2942 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2943 * flag here, even though the filesystem is not technically dirty yet.
2944 */
617ba13b 2945static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2946{
2947 if (!(sb->s_flags & MS_RDONLY)) {
2948 lock_super(sb);
2949 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2950 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2951 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2952 unlock_super(sb);
dab291af 2953 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2954 }
2955}
2956
2b2d6d01 2957static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 2958{
2b2d6d01 2959 struct ext4_super_block *es;
617ba13b
MC		 2960 struct ext4_sb_info *sbi = EXT4_SB(sb);
2961 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2962 unsigned long old_sb_flags;
617ba13b 2963 struct ext4_mount_options old_opts;
8a266467 2964 ext4_group_t g;
ac27a0ec
DK		 2965 int err;
2966#ifdef CONFIG_QUOTA
2967 int i;
2968#endif
2969
2970 /* Store the original options */
2971 old_sb_flags = sb->s_flags;
2972 old_opts.s_mount_opt = sbi->s_mount_opt;
2973 old_opts.s_resuid = sbi->s_resuid;
2974 old_opts.s_resgid = sbi->s_resgid;
2975 old_opts.s_commit_interval = sbi->s_commit_interval;
2976#ifdef CONFIG_QUOTA
2977 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2978 for (i = 0; i < MAXQUOTAS; i++)
2979 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2980#endif
2981
2982 /*
2983 * Allow the "check" option to be passed as a remount option.
2984 */
2985 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2986 err = -EINVAL;
2987 goto restore_opts;
2988 }
2989
617ba13b 2990 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 2991 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 2992
2993 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2994 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 2995
2996 es = sbi->s_es;
2997
617ba13b 2998 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 2999
3000 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3001 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3002 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3003 err = -EROFS;
3004 goto restore_opts;
3005 }
3006
3007 if (*flags & MS_RDONLY) {
3008 /*
3009 * First of all, the unconditional stuff we have to do
3010 * to disable replay of the journal when we next remount
3011 */
3012 sb->s_flags |= MS_RDONLY;
3013
3014 /*
3015 * OK, test if we are remounting a valid rw partition
3016 * readonly, and if so set the rdonly flag and then
3017 * mark the partition as valid again.
3018 */
617ba13b
MC		 3019 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3020 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3021 es->s_state = cpu_to_le16(sbi->s_mount_state);
3022
32c37730
JK		 3023 /*
3024 * We have to unlock super so that we can wait for
3025 * transactions.
3026 */
3027 unlock_super(sb);
617ba13b 3028 ext4_mark_recovery_complete(sb, es);
32c37730 3029 lock_super(sb);
ac27a0ec
DK		 3030 } else {
3031 __le32 ret;
617ba13b
MC		 3032 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3033 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3034 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 3035 "remount RDWR because of unsupported "
3036 "optional features (%x).\n",
3037 sb->s_id, le32_to_cpu(ret));
3038 err = -EROFS;
3039 goto restore_opts;
3040 }
ead6596b 3041
8a266467
TT		 3042 /*
3043 * Make sure the group descriptor checksums
3044 * are sane. If they aren't, refuse to
3045 * remount r/w.
3046 */
3047 for (g = 0; g < sbi->s_groups_count; g++) {
3048 struct ext4_group_desc *gdp =
3049 ext4_get_group_desc(sb, g, NULL);
3050
3051 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3052 printk(KERN_ERR
3053 "EXT4-fs: ext4_remount: "
3054 "Checksum for group %lu failed (%u!=%u)\n",
3055 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3056 le16_to_cpu(gdp->bg_checksum));
3057 err = -EINVAL;
3058 goto restore_opts;
3059 }
3060 }
3061
ead6596b
ES		 3062 /*
3063 * If we have an unprocessed orphan list hanging
3064 * around from a previously readonly bdev mount,
3065 * require a full umount/remount for now.
3066 */
3067 if (es->s_last_orphan) {
3068 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3069 "remount RDWR because of unprocessed "
3070 "orphan inode list. Please "
3071 "umount/remount instead.\n",
3072 sb->s_id);
3073 err = -EINVAL;
3074 goto restore_opts;
3075 }
3076
ac27a0ec
DK		 3077 /*
3078 * Mounting a RDONLY partition read-write, so reread
3079 * and store the current valid flag. (It may have
3080 * been changed by e2fsck since we originally mounted
3081 * the partition.)
3082 */
617ba13b 3083 ext4_clear_journal_err(sb, es);
ac27a0ec 3084 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3085 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3086 goto restore_opts;
2b2d6d01 3087 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3088 sb->s_flags &= ~MS_RDONLY;
3089 }
3090 }
3091#ifdef CONFIG_QUOTA
3092 /* Release old quota file names */
3093 for (i = 0; i < MAXQUOTAS; i++)
3094 if (old_opts.s_qf_names[i] &&
3095 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3096 kfree(old_opts.s_qf_names[i]);
3097#endif
3098 return 0;
3099restore_opts:
3100 sb->s_flags = old_sb_flags;
3101 sbi->s_mount_opt = old_opts.s_mount_opt;
3102 sbi->s_resuid = old_opts.s_resuid;
3103 sbi->s_resgid = old_opts.s_resgid;
3104 sbi->s_commit_interval = old_opts.s_commit_interval;
3105#ifdef CONFIG_QUOTA
3106 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3107 for (i = 0; i < MAXQUOTAS; i++) {
3108 if (sbi->s_qf_names[i] &&
3109 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3110 kfree(sbi->s_qf_names[i]);
3111 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3112 }
3113#endif
3114 return err;
3115}
3116
2b2d6d01 3117static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3118{
3119 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3120 struct ext4_sb_info *sbi = EXT4_SB(sb);
3121 struct ext4_super_block *es = sbi->s_es;
960cc398 3122 u64 fsid;
ac27a0ec 3123
5e70030d
BP		 3124 if (test_opt(sb, MINIX_DF)) {
3125 sbi->s_overhead_last = 0;
6bc9feff 3126 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3127 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3128 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3129 smp_rmb();
3130
3131 /*
5e70030d
BP		 3132 * Compute the overhead (FS structures). This is constant
3133 * for a given filesystem unless the number of block groups
3134 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3135 */
3136
3137 /*
3138 * All of the blocks before first_data_block are
3139 * overhead
3140 */
3141 overhead = le32_to_cpu(es->s_first_data_block);
3142
3143 /*
3144 * Add the overhead attributed to the superblock and
3145 * block group descriptors. If the sparse superblocks
3146 * feature is turned on, then not all groups have this.
3147 */
3148 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3149 overhead += ext4_bg_has_super(sb, i) +
3150 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3151 cond_resched();
3152 }
3153
3154 /*
3155 * Every block group has an inode bitmap, a block
3156 * bitmap, and an inode table.
3157 */
5e70030d
BP		 3158 overhead += ngroups * (2 + sbi->s_itb_per_group);
3159 sbi->s_overhead_last = overhead;
3160 smp_wmb();
6bc9feff 3161 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3162 }
3163
617ba13b 3164 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3165 buf->f_bsize = sb->s_blocksize;
5e70030d 3166 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3167 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3168 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3169 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3170 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3171 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3172 buf->f_bavail = 0;
3173 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3174 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3175 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3176 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3177 fsid = le64_to_cpup((void *)es->s_uuid) ^
3178 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3179 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3180 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3181 return 0;
3182}
3183
3184/* Helper function for writing quotas on sync - we need to start transaction before quota file
3185 * is locked for write. Otherwise the are possible deadlocks:
3186 * Process 1 Process 2
617ba13b 3187 * ext4_create() quota_sync()
dab291af 3188 * jbd2_journal_start() write_dquot()
ac27a0ec 3189 * DQUOT_INIT() down(dqio_mutex)
dab291af 3190 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3191 *
3192 */
3193
3194#ifdef CONFIG_QUOTA
3195
3196static inline struct inode *dquot_to_inode(struct dquot *dquot)
3197{
3198 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3199}
3200
617ba13b 3201static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3202{
3203 handle_t *handle;
3204 int ret, err;
3205
3206 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3207 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3208 if (IS_ERR(handle))
3209 return PTR_ERR(handle);
3210 ret = dquot_initialize(inode, type);
617ba13b 3211 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3212 if (!ret)
3213 ret = err;
3214 return ret;
3215}
3216
617ba13b 3217static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3218{
3219 handle_t *handle;
3220 int ret, err;
3221
3222 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3223 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2887df13
JK		 3224 if (IS_ERR(handle)) {
3225 /*
3226 * We call dquot_drop() anyway to at least release references
3227 * to quota structures so that umount does not hang.
3228 */
3229 dquot_drop(inode);
ac27a0ec 3230 return PTR_ERR(handle);
2887df13 3231 }
ac27a0ec 3232 ret = dquot_drop(inode);
617ba13b 3233 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3234 if (!ret)
3235 ret = err;
3236 return ret;
3237}
3238
617ba13b 3239static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3240{
3241 int ret, err;
3242 handle_t *handle;
3243 struct inode *inode;
3244
3245 inode = dquot_to_inode(dquot);
617ba13b
MC		 3246 handle = ext4_journal_start(inode,
3247 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3248 if (IS_ERR(handle))
3249 return PTR_ERR(handle);
3250 ret = dquot_commit(dquot);
617ba13b 3251 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3252 if (!ret)
3253 ret = err;
3254 return ret;
3255}
3256
617ba13b 3257static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3258{
3259 int ret, err;
3260 handle_t *handle;
3261
617ba13b
MC		 3262 handle = ext4_journal_start(dquot_to_inode(dquot),
3263 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3264 if (IS_ERR(handle))
3265 return PTR_ERR(handle);
3266 ret = dquot_acquire(dquot);
617ba13b 3267 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3268 if (!ret)
3269 ret = err;
3270 return ret;
3271}
3272
617ba13b 3273static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3274{
3275 int ret, err;
3276 handle_t *handle;
3277
617ba13b
MC		 3278 handle = ext4_journal_start(dquot_to_inode(dquot),
3279 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3280 if (IS_ERR(handle)) {
3281 /* Release dquot anyway to avoid endless cycle in dqput() */
3282 dquot_release(dquot);
ac27a0ec 3283 return PTR_ERR(handle);
9c3013e9 3284 }
ac27a0ec 3285 ret = dquot_release(dquot);
617ba13b 3286 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3287 if (!ret)
3288 ret = err;
3289 return ret;
3290}
3291
617ba13b 3292static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3293{
2c8be6b2 3294 /* Are we journaling quotas? */
617ba13b
MC		 3295 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3296 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3297 dquot_mark_dquot_dirty(dquot);
617ba13b 3298 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3299 } else {
3300 return dquot_mark_dquot_dirty(dquot);
3301 }
3302}
3303
617ba13b 3304static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3305{
3306 int ret, err;
3307 handle_t *handle;
3308
3309 /* Data block + inode block */
617ba13b 3310 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3311 if (IS_ERR(handle))
3312 return PTR_ERR(handle);
3313 ret = dquot_commit_info(sb, type);
617ba13b 3314 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3315 if (!ret)
3316 ret = err;
3317 return ret;
3318}
3319
3320/*
3321 * Turn on quotas during mount time - we need to find
3322 * the quota file and such...
3323 */
617ba13b 3324static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3325{
617ba13b
MC		 3326 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3327 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3328}
3329
3330/*
3331 * Standard function to be called on quota_on
3332 */
617ba13b 3333static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3334 char *name, int remount)
ac27a0ec
DK		 3335{
3336 int err;
8264613d 3337 struct path path;
ac27a0ec
DK		 3338
3339 if (!test_opt(sb, QUOTA))
3340 return -EINVAL;
8264613d 3341 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3342 if (remount)
8264613d 3343 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3344
8264613d 3345 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3346 if (err)
3347 return err;
0623543b 3348
ac27a0ec 3349 /* Quotafile not on the same filesystem? */
8264613d
AV		 3350 if (path.mnt->mnt_sb != sb) {
3351 path_put(&path);
ac27a0ec
DK		 3352 return -EXDEV;
3353 }
0623543b
JK		 3354 /* Journaling quota? */
3355 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3356 /* Quotafile not in fs root? */
8264613d 3357 if (path.dentry->d_parent != sb->s_root)
0623543b
JK		 3358 printk(KERN_WARNING
3359 "EXT4-fs: Quota file not on filesystem root. "
3360 "Journaled quota will not work.\n");
2b2d6d01 3361 }
0623543b
JK		 3362
3363 /*
3364 * When we journal data on quota file, we have to flush journal to see
3365 * all updates to the file when we bypass pagecache...
3366 */
8264613d 3367 if (ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3368 /*
3369 * We don't need to lock updates but journal_flush() could
3370 * otherwise be livelocked...
3371 */
3372 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3373 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3374 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3375 if (err) {
8264613d 3376 path_put(&path);
7ffe1ea8
HK		 3377 return err;
3378 }
0623543b
JK		 3379 }
3380
8264613d
AV		 3381 err = vfs_quota_on_path(sb, type, format_id, &path);
3382 path_put(&path);
77e69dac 3383 return err;
ac27a0ec
DK		 3384}
3385
3386/* Read data from quotafile - avoid pagecache and such because we cannot afford
3387 * acquiring the locks... As quota files are never truncated and quota code
3388 * itself serializes the operations (and noone else should touch the files)
3389 * we don't have to be afraid of races */
617ba13b 3390static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3391 size_t len, loff_t off)
3392{
3393 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3394 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3395 int err = 0;
3396 int offset = off & (sb->s_blocksize - 1);
3397 int tocopy;
3398 size_t toread;
3399 struct buffer_head *bh;
3400 loff_t i_size = i_size_read(inode);
3401
3402 if (off > i_size)
3403 return 0;
3404 if (off+len > i_size)
3405 len = i_size-off;
3406 toread = len;
3407 while (toread > 0) {
3408 tocopy = sb->s_blocksize - offset < toread ?
3409 sb->s_blocksize - offset : toread;
617ba13b 3410 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3411 if (err)
3412 return err;
3413 if (!bh) /* A hole? */
3414 memset(data, 0, tocopy);
3415 else
3416 memcpy(data, bh->b_data+offset, tocopy);
3417 brelse(bh);
3418 offset = 0;
3419 toread -= tocopy;
3420 data += tocopy;
3421 blk++;
3422 }
3423 return len;
3424}
3425
3426/* Write to quotafile (we know the transaction is already started and has
3427 * enough credits) */
617ba13b 3428static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3429 const char *data, size_t len, loff_t off)
3430{
3431 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3432 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3433 int err = 0;
3434 int offset = off & (sb->s_blocksize - 1);
3435 int tocopy;
617ba13b 3436 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3437 size_t towrite = len;
3438 struct buffer_head *bh;
3439 handle_t *handle = journal_current_handle();
3440
9c3013e9 3441 if (!handle) {
e5f8eab8 3442 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3443 " cancelled because transaction is not started.\n",
3444 (unsigned long long)off, (unsigned long long)len);
3445 return -EIO;
3446 }
ac27a0ec
DK		 3447 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3448 while (towrite > 0) {
3449 tocopy = sb->s_blocksize - offset < towrite ?
3450 sb->s_blocksize - offset : towrite;
617ba13b 3451 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3452 if (!bh)
3453 goto out;
3454 if (journal_quota) {
617ba13b 3455 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3456 if (err) {
3457 brelse(bh);
3458 goto out;
3459 }
3460 }
3461 lock_buffer(bh);
3462 memcpy(bh->b_data+offset, data, tocopy);
3463 flush_dcache_page(bh->b_page);
3464 unlock_buffer(bh);
3465 if (journal_quota)
617ba13b 3466 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3467 else {
3468 /* Always do at least ordered writes for quotas */
678aaf48 3469 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3470 mark_buffer_dirty(bh);
3471 }
3472 brelse(bh);
3473 if (err)
3474 goto out;
3475 offset = 0;
3476 towrite -= tocopy;
3477 data += tocopy;
3478 blk++;
3479 }
3480out:
4d04e4fb
JK		 3481 if (len == towrite) {
3482 mutex_unlock(&inode->i_mutex);
ac27a0ec 3483 return err;
4d04e4fb 3484 }
ac27a0ec
DK		 3485 if (inode->i_size < off+len-towrite) {
3486 i_size_write(inode, off+len-towrite);
617ba13b 3487 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3488 }
ac27a0ec 3489 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3490 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3491 mutex_unlock(&inode->i_mutex);
3492 return len - towrite;
3493}
3494
3495#endif
3496
617ba13b 3497static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3498 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3499{
617ba13b 3500 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3501}
3502
5e8814f2
TT		 3503#ifdef CONFIG_PROC_FS
3504static int ext4_ui_proc_show(struct seq_file *m, void *v)
3505{
3506 unsigned int *p = m->private;
3507
3508 seq_printf(m, "%u\n", *p);
3509 return 0;
3510}
3511
3512static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3513{
3514 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3515}
3516
3517static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3518 size_t cnt, loff_t *ppos)
3519{
3520 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
3521 char str[32];
3522 unsigned long value;
3523
3524 if (cnt >= sizeof(str))
3525 return -EINVAL;
3526 if (copy_from_user(str, buf, cnt))
3527 return -EFAULT;
3528 value = simple_strtol(str, NULL, 0);
3529 if (value < 0)
3530 return -ERANGE;
3531 *p = value;
3532 return cnt;
3533}
3534
3535const struct file_operations ext4_ui_proc_fops = {
3536 .owner = THIS_MODULE,
3537 .open = ext4_ui_proc_open,
3538 .read = seq_read,
3539 .llseek = seq_lseek,
3540 .release = single_release,
3541 .write = ext4_ui_proc_write,
3542};
3543#endif
3544
03010a33
TT		 3545static struct file_system_type ext4_fs_type = {
3546 .owner = THIS_MODULE,
3547 .name = "ext4",
3548 .get_sb = ext4_get_sb,
3549 .kill_sb = kill_block_super,
3550 .fs_flags = FS_REQUIRES_DEV,
3551};
3552
3553#ifdef CONFIG_EXT4DEV_COMPAT
3554static int ext4dev_get_sb(struct file_system_type *fs_type,
3555 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3556{
3557 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3558 "to mount using ext4\n");
3559 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3560 "will go away by 2.6.31\n");
3561 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3562}
3563
617ba13b 3564static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3565 .owner = THIS_MODULE,
617ba13b 3566 .name = "ext4dev",
03010a33 3567 .get_sb = ext4dev_get_sb,
ac27a0ec
DK		 3568 .kill_sb = kill_block_super,
3569 .fs_flags = FS_REQUIRES_DEV,
3570};
03010a33
TT		 3571MODULE_ALIAS("ext4dev");
3572#endif
ac27a0ec 3573
617ba13b 3574static int __init init_ext4_fs(void)
ac27a0ec 3575{
c9de560d
AT		 3576 int err;
3577
9f6200bb 3578 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 3579 err = init_ext4_mballoc();
ac27a0ec
DK		 3580 if (err)
3581 return err;
c9de560d
AT		 3582
3583 err = init_ext4_xattr();
3584 if (err)
3585 goto out2;
ac27a0ec
DK		 3586 err = init_inodecache();
3587 if (err)
3588 goto out1;
03010a33 3589 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 3590 if (err)
3591 goto out;
03010a33
TT		 3592#ifdef CONFIG_EXT4DEV_COMPAT
3593 err = register_filesystem(&ext4dev_fs_type);
3594 if (err) {
3595 unregister_filesystem(&ext4_fs_type);
3596 goto out;
3597 }
3598#endif
ac27a0ec
DK		 3599 return 0;
3600out:
3601 destroy_inodecache();
3602out1:
617ba13b 3603 exit_ext4_xattr();
c9de560d
AT		 3604out2:
3605 exit_ext4_mballoc();
ac27a0ec
DK		 3606 return err;
3607}
3608
617ba13b 3609static void __exit exit_ext4_fs(void)
ac27a0ec 3610{
03010a33
TT		 3611 unregister_filesystem(&ext4_fs_type);
3612#ifdef CONFIG_EXT4DEV_COMPAT
617ba13b 3613 unregister_filesystem(&ext4dev_fs_type);
03010a33 3614#endif
ac27a0ec 3615 destroy_inodecache();
617ba13b 3616 exit_ext4_xattr();
c9de560d 3617 exit_ext4_mballoc();
9f6200bb 3618 remove_proc_entry("fs/ext4", NULL);
ac27a0ec
DK		 3619}
3620
3621MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3622MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3623MODULE_LICENSE("GPL");
617ba13b
MC		 3624module_init(init_ext4_fs)
3625module_exit(exit_ext4_fs)
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