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ext4: Avoid rec_len overflow with 64KB block size
[thirdparty/kernel/linux.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
dab291af 23#include <linux/jbd2.h>
617ba13b 24#include <linux/ext4_fs.h>
dab291af 25#include <linux/ext4_jbd2.h>
ac27a0ec
DK		 26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
a5694255 32#include <linux/exportfs.h>
ac27a0ec
DK		 33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
38#include <linux/seq_file.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ac27a0ec
DK		 41
42#include <asm/uaccess.h>
43
44#include "xattr.h"
45#include "acl.h"
46#include "namei.h"
717d50e4 47#include "group.h"
ac27a0ec 48
617ba13b 49static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 50 unsigned long journal_devnum);
617ba13b 51static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 52 unsigned int);
617ba13b
MC		 53static void ext4_commit_super (struct super_block * sb,
54 struct ext4_super_block * es,
ac27a0ec 55 int sync);
617ba13b
MC		 56static void ext4_mark_recovery_complete(struct super_block * sb,
57 struct ext4_super_block * es);
58static void ext4_clear_journal_err(struct super_block * sb,
59 struct ext4_super_block * es);
60static int ext4_sync_fs(struct super_block *sb, int wait);
61static const char *ext4_decode_error(struct super_block * sb, int errno,
ac27a0ec 62 char nbuf[16]);
617ba13b
MC		 63static int ext4_remount (struct super_block * sb, int * flags, char * data);
64static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
65static void ext4_unlockfs(struct super_block *sb);
66static void ext4_write_super (struct super_block * sb);
67static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 68
bd81d8ee 69
8fadc143
AR		 70ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
bd81d8ee 72{
3a14589c 73 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 76}
77
8fadc143
AR		 78ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
bd81d8ee 80{
5272f837 81 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 84}
85
8fadc143
AR		 86ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
bd81d8ee 88{
5272f837 89 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 92}
93
8fadc143
AR		 94void ext4_block_bitmap_set(struct super_block *sb,
95 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 96{
3a14589c 97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 100}
101
8fadc143
AR		 102void ext4_inode_bitmap_set(struct super_block *sb,
103 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 104{
5272f837 105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 108}
109
8fadc143
AR		 110void ext4_inode_table_set(struct super_block *sb,
111 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 112{
5272f837 113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 116}
117
ac27a0ec 118/*
dab291af 119 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 120 *
121 * The only special thing we need to do here is to make sure that all
122 * journal_end calls result in the superblock being marked dirty, so
123 * that sync() will call the filesystem's write_super callback if
124 * appropriate.
125 */
617ba13b 126handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 127{
128 journal_t *journal;
129
130 if (sb->s_flags & MS_RDONLY)
131 return ERR_PTR(-EROFS);
132
133 /* Special case here: if the journal has aborted behind our
134 * backs (eg. EIO in the commit thread), then we still need to
135 * take the FS itself readonly cleanly. */
617ba13b 136 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 137 if (is_journal_aborted(journal)) {
617ba13b 138 ext4_abort(sb, __FUNCTION__,
ac27a0ec
DK		 139 "Detected aborted journal");
140 return ERR_PTR(-EROFS);
141 }
142
dab291af 143 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 144}
145
146/*
147 * The only special thing we need to do here is to make sure that all
dab291af 148 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 149 * that sync() will call the filesystem's write_super callback if
150 * appropriate.
151 */
617ba13b 152int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 153{
154 struct super_block *sb;
155 int err;
156 int rc;
157
158 sb = handle->h_transaction->t_journal->j_private;
159 err = handle->h_err;
dab291af 160 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 161
162 if (!err)
163 err = rc;
164 if (err)
617ba13b 165 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 166 return err;
167}
168
617ba13b 169void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 170 struct buffer_head *bh, handle_t *handle, int err)
171{
172 char nbuf[16];
617ba13b 173 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec
DK		 174
175 if (bh)
176 BUFFER_TRACE(bh, "abort");
177
178 if (!handle->h_err)
179 handle->h_err = err;
180
181 if (is_handle_aborted(handle))
182 return;
183
184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
185 caller, errstr, err_fn);
186
dab291af 187 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 188}
189
190/* Deal with the reporting of failure conditions on a filesystem such as
191 * inconsistencies detected or read IO failures.
192 *
193 * On ext2, we can store the error state of the filesystem in the
617ba13b 194 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 195 * write ordering constraints on the superblock which prevent us from
196 * writing it out straight away; and given that the journal is about to
197 * be aborted, we can't rely on the current, or future, transactions to
198 * write out the superblock safely.
199 *
dab291af 200 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 201 * the journal instead. On recovery, the journal will compain about
202 * that error until we've noted it down and cleared it.
203 */
204
617ba13b 205static void ext4_handle_error(struct super_block *sb)
ac27a0ec 206{
617ba13b 207 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 208
617ba13b
MC		 209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 211
212 if (sb->s_flags & MS_RDONLY)
213 return;
214
215 if (!test_opt (sb, ERRORS_CONT)) {
617ba13b 216 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 217
617ba13b 218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 219 if (journal)
dab291af 220 jbd2_journal_abort(journal, -EIO);
ac27a0ec
DK		 221 }
222 if (test_opt (sb, ERRORS_RO)) {
223 printk (KERN_CRIT "Remounting filesystem read-only\n");
224 sb->s_flags |= MS_RDONLY;
225 }
617ba13b 226 ext4_commit_super(sb, es, 1);
ac27a0ec 227 if (test_opt(sb, ERRORS_PANIC))
617ba13b 228 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 229 sb->s_id);
230}
231
617ba13b 232void ext4_error (struct super_block * sb, const char * function,
ac27a0ec
DK		 233 const char * fmt, ...)
234{
235 va_list args;
236
237 va_start(args, fmt);
617ba13b 238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
ac27a0ec
DK		 239 vprintk(fmt, args);
240 printk("\n");
241 va_end(args);
242
617ba13b 243 ext4_handle_error(sb);
ac27a0ec
DK		 244}
245
617ba13b 246static const char *ext4_decode_error(struct super_block * sb, int errno,
ac27a0ec
DK		 247 char nbuf[16])
248{
249 char *errstr = NULL;
250
251 switch (errno) {
252 case -EIO:
253 errstr = "IO failure";
254 break;
255 case -ENOMEM:
256 errstr = "Out of memory";
257 break;
258 case -EROFS:
dab291af 259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 260 errstr = "Journal has aborted";
261 else
262 errstr = "Readonly filesystem";
263 break;
264 default:
265 /* If the caller passed in an extra buffer for unknown
266 * errors, textualise them now. Else we just return
267 * NULL. */
268 if (nbuf) {
269 /* Check for truncated error codes... */
270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
271 errstr = nbuf;
272 }
273 break;
274 }
275
276 return errstr;
277}
278
617ba13b 279/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 280 * automatically and invokes the appropriate error response. */
281
617ba13b 282void __ext4_std_error (struct super_block * sb, const char * function,
ac27a0ec
DK		 283 int errno)
284{
285 char nbuf[16];
286 const char *errstr;
287
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
290 * an error. */
291 if (errno == -EROFS && journal_current_handle() == NULL &&
292 (sb->s_flags & MS_RDONLY))
293 return;
294
617ba13b
MC		 295 errstr = ext4_decode_error(sb, errno, nbuf);
296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
ac27a0ec
DK		 297 sb->s_id, function, errstr);
298
617ba13b 299 ext4_handle_error(sb);
ac27a0ec
DK		 300}
301
302/*
617ba13b 303 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
306 *
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
310 */
311
617ba13b 312void ext4_abort (struct super_block * sb, const char * function,
ac27a0ec
DK		 313 const char * fmt, ...)
314{
315 va_list args;
316
617ba13b 317 printk (KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 318
319 va_start(args, fmt);
617ba13b 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
ac27a0ec
DK		 321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
617ba13b 326 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 333 sb->s_flags |= MS_RDONLY;
617ba13b 334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
dab291af 335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 336}
337
617ba13b 338void ext4_warning (struct super_block * sb, const char * function,
ac27a0ec
DK		 339 const char * fmt, ...)
340{
341 va_list args;
342
343 va_start(args, fmt);
617ba13b 344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349}
350
617ba13b 351void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 352{
617ba13b 353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 354
617ba13b 355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 356 return;
357
617ba13b 358 ext4_warning(sb, __FUNCTION__,
ac27a0ec
DK		 359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
617ba13b 361 EXT4_DYNAMIC_REV);
ac27a0ec 362
617ba13b
MC		 363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
368
369 /*
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
373 */
374}
375
376/*
377 * Open the external journal device
378 */
617ba13b 379static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 380{
381 struct block_device *bdev;
382 char b[BDEVNAME_SIZE];
383
384 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
385 if (IS_ERR(bdev))
386 goto fail;
387 return bdev;
388
389fail:
617ba13b 390 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 391 __bdevname(dev, b), PTR_ERR(bdev));
392 return NULL;
393}
394
395/*
396 * Release the journal device
397 */
617ba13b 398static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 399{
400 bd_release(bdev);
401 return blkdev_put(bdev);
402}
403
617ba13b 404static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 405{
406 struct block_device *bdev;
407 int ret = -ENODEV;
408
409 bdev = sbi->journal_bdev;
410 if (bdev) {
617ba13b 411 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 412 sbi->journal_bdev = NULL;
413 }
414 return ret;
415}
416
417static inline struct inode *orphan_list_entry(struct list_head *l)
418{
617ba13b 419 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 420}
421
617ba13b 422static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 423{
424 struct list_head *l;
425
426 printk(KERN_ERR "sb orphan head is %d\n",
427 le32_to_cpu(sbi->s_es->s_last_orphan));
428
429 printk(KERN_ERR "sb_info orphan list:\n");
430 list_for_each(l, &sbi->s_orphan) {
431 struct inode *inode = orphan_list_entry(l);
432 printk(KERN_ERR " "
433 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
434 inode->i_sb->s_id, inode->i_ino, inode,
435 inode->i_mode, inode->i_nlink,
436 NEXT_ORPHAN(inode));
437 }
438}
439
617ba13b 440static void ext4_put_super (struct super_block * sb)
ac27a0ec 441{
617ba13b
MC		 442 struct ext4_sb_info *sbi = EXT4_SB(sb);
443 struct ext4_super_block *es = sbi->s_es;
ac27a0ec
DK		 444 int i;
445
a86c6181 446 ext4_ext_release(sb);
617ba13b 447 ext4_xattr_put_super(sb);
dab291af 448 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec 449 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 450 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK		 451 es->s_state = cpu_to_le16(sbi->s_mount_state);
452 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
453 mark_buffer_dirty(sbi->s_sbh);
617ba13b 454 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 455 }
456
457 for (i = 0; i < sbi->s_gdb_count; i++)
458 brelse(sbi->s_group_desc[i]);
459 kfree(sbi->s_group_desc);
460 percpu_counter_destroy(&sbi->s_freeblocks_counter);
461 percpu_counter_destroy(&sbi->s_freeinodes_counter);
462 percpu_counter_destroy(&sbi->s_dirs_counter);
463 brelse(sbi->s_sbh);
464#ifdef CONFIG_QUOTA
465 for (i = 0; i < MAXQUOTAS; i++)
466 kfree(sbi->s_qf_names[i]);
467#endif
468
469 /* Debugging code just in case the in-memory inode orphan list
470 * isn't empty. The on-disk one can be non-empty if we've
471 * detected an error and taken the fs readonly, but the
472 * in-memory list had better be clean by this point. */
473 if (!list_empty(&sbi->s_orphan))
474 dump_orphan_list(sb, sbi);
475 J_ASSERT(list_empty(&sbi->s_orphan));
476
f98393a6 477 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 478 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
479 /*
480 * Invalidate the journal device's buffers. We don't want them
481 * floating about in memory - the physical journal device may
482 * hotswapped, and it breaks the `ro-after' testing code.
483 */
484 sync_blockdev(sbi->journal_bdev);
f98393a6 485 invalidate_bdev(sbi->journal_bdev);
617ba13b 486 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 487 }
488 sb->s_fs_info = NULL;
489 kfree(sbi);
490 return;
491}
492
e18b890b 493static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 494
495/*
496 * Called inside transaction, so use GFP_NOFS
497 */
617ba13b 498static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 499{
617ba13b 500 struct ext4_inode_info *ei;
ac27a0ec 501
e6b4f8da 502 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 503 if (!ei)
504 return NULL;
617ba13b
MC		 505#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
506 ei->i_acl = EXT4_ACL_NOT_CACHED;
507 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 508#endif
509 ei->i_block_alloc_info = NULL;
510 ei->vfs_inode.i_version = 1;
a86c6181 511 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
ac27a0ec
DK		 512 return &ei->vfs_inode;
513}
514
617ba13b 515static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 516{
9f7dd93d
VA		 517 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
518 printk("EXT4 Inode %p: orphan list check failed!\n",
519 EXT4_I(inode));
520 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
521 EXT4_I(inode), sizeof(struct ext4_inode_info),
522 true);
523 dump_stack();
524 }
617ba13b 525 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 526}
527
4ba9b9d0 528static void init_once(struct kmem_cache *cachep, void *foo)
ac27a0ec 529{
617ba13b 530 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 531
a35afb83 532 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 533#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 534 init_rwsem(&ei->xattr_sem);
ac27a0ec 535#endif
a35afb83
CL		 536 mutex_init(&ei->truncate_mutex);
537 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 538}
539
540static int init_inodecache(void)
541{
617ba13b
MC		 542 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
543 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 544 0, (SLAB_RECLAIM_ACCOUNT|
545 SLAB_MEM_SPREAD),
20c2df83 546 init_once);
617ba13b 547 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 548 return -ENOMEM;
549 return 0;
550}
551
552static void destroy_inodecache(void)
553{
617ba13b 554 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 555}
556
617ba13b 557static void ext4_clear_inode(struct inode *inode)
ac27a0ec 558{
617ba13b
MC		 559 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
560#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
561 if (EXT4_I(inode)->i_acl &&
562 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
563 posix_acl_release(EXT4_I(inode)->i_acl);
564 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
565 }
566 if (EXT4_I(inode)->i_default_acl &&
567 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
568 posix_acl_release(EXT4_I(inode)->i_default_acl);
569 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 570 }
571#endif
617ba13b
MC		 572 ext4_discard_reservation(inode);
573 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK		 574 if (unlikely(rsv))
575 kfree(rsv);
576}
577
617ba13b 578static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
ac27a0ec
DK		 579{
580#if defined(CONFIG_QUOTA)
617ba13b 581 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 582
583 if (sbi->s_jquota_fmt)
584 seq_printf(seq, ",jqfmt=%s",
585 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
586
587 if (sbi->s_qf_names[USRQUOTA])
588 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
589
590 if (sbi->s_qf_names[GRPQUOTA])
591 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
592
617ba13b 593 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 594 seq_puts(seq, ",usrquota");
595
617ba13b 596 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 597 seq_puts(seq, ",grpquota");
598#endif
599}
600
d9c9bef1
MS		 601/*
602 * Show an option if
603 * - it's set to a non-default value OR
604 * - if the per-sb default is different from the global default
605 */
617ba13b 606static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec
DK		 607{
608 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 609 struct ext4_sb_info *sbi = EXT4_SB(sb);
610 struct ext4_super_block *es = sbi->s_es;
611 unsigned long def_mount_opts;
612
613 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
614
615 if (sbi->s_sb_block != 1)
616 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
617 if (test_opt(sb, MINIX_DF))
618 seq_puts(seq, ",minixdf");
619 if (test_opt(sb, GRPID))
620 seq_puts(seq, ",grpid");
621 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
622 seq_puts(seq, ",nogrpid");
623 if (sbi->s_resuid != EXT4_DEF_RESUID ||
624 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
625 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
626 }
627 if (sbi->s_resgid != EXT4_DEF_RESGID ||
628 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
629 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
630 }
631 if (test_opt(sb, ERRORS_CONT)) {
632 int def_errors = le16_to_cpu(es->s_errors);
633
634 if (def_errors == EXT4_ERRORS_PANIC ||
635 def_errors == EXT4_ERRORS_RO) {
636 seq_puts(seq, ",errors=continue");
637 }
638 }
639 if (test_opt(sb, ERRORS_RO))
640 seq_puts(seq, ",errors=remount-ro");
641 if (test_opt(sb, ERRORS_PANIC))
642 seq_puts(seq, ",errors=panic");
643 if (test_opt(sb, NO_UID32))
644 seq_puts(seq, ",nouid32");
645 if (test_opt(sb, DEBUG))
646 seq_puts(seq, ",debug");
647 if (test_opt(sb, OLDALLOC))
648 seq_puts(seq, ",oldalloc");
649#ifdef CONFIG_EXT4_FS_XATTR
650 if (test_opt(sb, XATTR_USER))
651 seq_puts(seq, ",user_xattr");
652 if (!test_opt(sb, XATTR_USER) &&
653 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
654 seq_puts(seq, ",nouser_xattr");
655 }
656#endif
657#ifdef CONFIG_EXT4_FS_POSIX_ACL
658 if (test_opt(sb, POSIX_ACL))
659 seq_puts(seq, ",acl");
660 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
661 seq_puts(seq, ",noacl");
662#endif
663 if (!test_opt(sb, RESERVATION))
664 seq_puts(seq, ",noreservation");
665 if (sbi->s_commit_interval) {
666 seq_printf(seq, ",commit=%u",
667 (unsigned) (sbi->s_commit_interval / HZ));
668 }
669 if (test_opt(sb, BARRIER))
670 seq_puts(seq, ",barrier=1");
671 if (test_opt(sb, NOBH))
672 seq_puts(seq, ",nobh");
673 if (!test_opt(sb, EXTENTS))
674 seq_puts(seq, ",noextents");
ac27a0ec 675
617ba13b 676 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 677 seq_puts(seq, ",data=journal");
617ba13b 678 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 679 seq_puts(seq, ",data=ordered");
617ba13b 680 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 681 seq_puts(seq, ",data=writeback");
682
617ba13b 683 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 684
685 return 0;
686}
687
688
1b961ac0
CH		 689static struct inode *ext4_nfs_get_inode(struct super_block *sb,
690 u64 ino, u32 generation)
ac27a0ec 691{
ac27a0ec 692 struct inode *inode;
ac27a0ec 693
617ba13b 694 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 695 return ERR_PTR(-ESTALE);
617ba13b 696 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 697 return ERR_PTR(-ESTALE);
698
699 /* iget isn't really right if the inode is currently unallocated!!
700 *
617ba13b 701 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 702 * deleted, so we should be safe.
703 *
704 * Currently we don't know the generation for parent directory, so
705 * a generation of 0 means "accept any"
706 */
707 inode = iget(sb, ino);
708 if (inode == NULL)
709 return ERR_PTR(-ENOMEM);
710 if (is_bad_inode(inode) ||
711 (generation && inode->i_generation != generation)) {
712 iput(inode);
713 return ERR_PTR(-ESTALE);
714 }
1b961ac0
CH		 715
716 return inode;
717}
718
719static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
720 int fh_len, int fh_type)
721{
722 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
723 ext4_nfs_get_inode);
724}
725
726static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
727 int fh_len, int fh_type)
728{
729 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
730 ext4_nfs_get_inode);
ac27a0ec
DK		 731}
732
733#ifdef CONFIG_QUOTA
734#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
735#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
736
617ba13b
MC		 737static int ext4_dquot_initialize(struct inode *inode, int type);
738static int ext4_dquot_drop(struct inode *inode);
739static int ext4_write_dquot(struct dquot *dquot);
740static int ext4_acquire_dquot(struct dquot *dquot);
741static int ext4_release_dquot(struct dquot *dquot);
742static int ext4_mark_dquot_dirty(struct dquot *dquot);
743static int ext4_write_info(struct super_block *sb, int type);
744static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
745static int ext4_quota_on_mount(struct super_block *sb, int type);
746static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 747 size_t len, loff_t off);
617ba13b 748static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 749 const char *data, size_t len, loff_t off);
750
617ba13b
MC		 751static struct dquot_operations ext4_quota_operations = {
752 .initialize = ext4_dquot_initialize,
753 .drop = ext4_dquot_drop,
ac27a0ec
DK		 754 .alloc_space = dquot_alloc_space,
755 .alloc_inode = dquot_alloc_inode,
756 .free_space = dquot_free_space,
757 .free_inode = dquot_free_inode,
758 .transfer = dquot_transfer,
617ba13b
MC		 759 .write_dquot = ext4_write_dquot,
760 .acquire_dquot = ext4_acquire_dquot,
761 .release_dquot = ext4_release_dquot,
762 .mark_dirty = ext4_mark_dquot_dirty,
763 .write_info = ext4_write_info
ac27a0ec
DK		 764};
765
617ba13b
MC		 766static struct quotactl_ops ext4_qctl_operations = {
767 .quota_on = ext4_quota_on,
ac27a0ec
DK		 768 .quota_off = vfs_quota_off,
769 .quota_sync = vfs_quota_sync,
770 .get_info = vfs_get_dqinfo,
771 .set_info = vfs_set_dqinfo,
772 .get_dqblk = vfs_get_dqblk,
773 .set_dqblk = vfs_set_dqblk
774};
775#endif
776
ee9b6d61 777static const struct super_operations ext4_sops = {
617ba13b
MC		 778 .alloc_inode = ext4_alloc_inode,
779 .destroy_inode = ext4_destroy_inode,
780 .read_inode = ext4_read_inode,
781 .write_inode = ext4_write_inode,
782 .dirty_inode = ext4_dirty_inode,
783 .delete_inode = ext4_delete_inode,
784 .put_super = ext4_put_super,
785 .write_super = ext4_write_super,
786 .sync_fs = ext4_sync_fs,
787 .write_super_lockfs = ext4_write_super_lockfs,
788 .unlockfs = ext4_unlockfs,
789 .statfs = ext4_statfs,
790 .remount_fs = ext4_remount,
791 .clear_inode = ext4_clear_inode,
792 .show_options = ext4_show_options,
ac27a0ec 793#ifdef CONFIG_QUOTA
617ba13b
MC		 794 .quota_read = ext4_quota_read,
795 .quota_write = ext4_quota_write,
ac27a0ec
DK		 796#endif
797};
798
39655164 799static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 800 .fh_to_dentry = ext4_fh_to_dentry,
801 .fh_to_parent = ext4_fh_to_parent,
617ba13b 802 .get_parent = ext4_get_parent,
ac27a0ec
DK		 803};
804
805enum {
806 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
807 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
808 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
809 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
810 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
811 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
812 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
813 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
814 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
815 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
1e2462f9 816 Opt_grpquota, Opt_extents, Opt_noextents,
ac27a0ec
DK		 817};
818
819static match_table_t tokens = {
820 {Opt_bsd_df, "bsddf"},
821 {Opt_minix_df, "minixdf"},
822 {Opt_grpid, "grpid"},
823 {Opt_grpid, "bsdgroups"},
824 {Opt_nogrpid, "nogrpid"},
825 {Opt_nogrpid, "sysvgroups"},
826 {Opt_resgid, "resgid=%u"},
827 {Opt_resuid, "resuid=%u"},
828 {Opt_sb, "sb=%u"},
829 {Opt_err_cont, "errors=continue"},
830 {Opt_err_panic, "errors=panic"},
831 {Opt_err_ro, "errors=remount-ro"},
832 {Opt_nouid32, "nouid32"},
833 {Opt_nocheck, "nocheck"},
834 {Opt_nocheck, "check=none"},
835 {Opt_debug, "debug"},
836 {Opt_oldalloc, "oldalloc"},
837 {Opt_orlov, "orlov"},
838 {Opt_user_xattr, "user_xattr"},
839 {Opt_nouser_xattr, "nouser_xattr"},
840 {Opt_acl, "acl"},
841 {Opt_noacl, "noacl"},
842 {Opt_reservation, "reservation"},
843 {Opt_noreservation, "noreservation"},
844 {Opt_noload, "noload"},
845 {Opt_nobh, "nobh"},
846 {Opt_bh, "bh"},
847 {Opt_commit, "commit=%u"},
848 {Opt_journal_update, "journal=update"},
849 {Opt_journal_inum, "journal=%u"},
850 {Opt_journal_dev, "journal_dev=%u"},
851 {Opt_abort, "abort"},
852 {Opt_data_journal, "data=journal"},
853 {Opt_data_ordered, "data=ordered"},
854 {Opt_data_writeback, "data=writeback"},
855 {Opt_offusrjquota, "usrjquota="},
856 {Opt_usrjquota, "usrjquota=%s"},
857 {Opt_offgrpjquota, "grpjquota="},
858 {Opt_grpjquota, "grpjquota=%s"},
859 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
860 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
861 {Opt_grpquota, "grpquota"},
862 {Opt_noquota, "noquota"},
863 {Opt_quota, "quota"},
864 {Opt_usrquota, "usrquota"},
865 {Opt_barrier, "barrier=%u"},
a86c6181 866 {Opt_extents, "extents"},
1e2462f9 867 {Opt_noextents, "noextents"},
ac27a0ec
DK		 868 {Opt_err, NULL},
869 {Opt_resize, "resize"},
870};
871
617ba13b 872static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 873{
617ba13b 874 ext4_fsblk_t sb_block;
ac27a0ec
DK		 875 char *options = (char *) *data;
876
877 if (!options || strncmp(options, "sb=", 3) != 0)
878 return 1; /* Default location */
879 options += 3;
617ba13b 880 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 881 sb_block = simple_strtoul(options, &options, 0);
882 if (*options && *options != ',') {
617ba13b 883 printk("EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 884 (char *) *data);
885 return 1;
886 }
887 if (*options == ',')
888 options++;
889 *data = (void *) options;
890 return sb_block;
891}
892
893static int parse_options (char *options, struct super_block *sb,
894 unsigned int *inum, unsigned long *journal_devnum,
617ba13b 895 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 896{
617ba13b 897 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 898 char * p;
899 substring_t args[MAX_OPT_ARGS];
900 int data_opt = 0;
901 int option;
902#ifdef CONFIG_QUOTA
903 int qtype;
904 char *qname;
905#endif
906
907 if (!options)
908 return 1;
909
910 while ((p = strsep (&options, ",")) != NULL) {
911 int token;
912 if (!*p)
913 continue;
914
915 token = match_token(p, tokens, args);
916 switch (token) {
917 case Opt_bsd_df:
918 clear_opt (sbi->s_mount_opt, MINIX_DF);
919 break;
920 case Opt_minix_df:
921 set_opt (sbi->s_mount_opt, MINIX_DF);
922 break;
923 case Opt_grpid:
924 set_opt (sbi->s_mount_opt, GRPID);
925 break;
926 case Opt_nogrpid:
927 clear_opt (sbi->s_mount_opt, GRPID);
928 break;
929 case Opt_resuid:
930 if (match_int(&args[0], &option))
931 return 0;
932 sbi->s_resuid = option;
933 break;
934 case Opt_resgid:
935 if (match_int(&args[0], &option))
936 return 0;
937 sbi->s_resgid = option;
938 break;
939 case Opt_sb:
940 /* handled by get_sb_block() instead of here */
941 /* *sb_block = match_int(&args[0]); */
942 break;
943 case Opt_err_panic:
944 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
945 clear_opt (sbi->s_mount_opt, ERRORS_RO);
946 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
947 break;
948 case Opt_err_ro:
949 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
950 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
951 set_opt (sbi->s_mount_opt, ERRORS_RO);
952 break;
953 case Opt_err_cont:
954 clear_opt (sbi->s_mount_opt, ERRORS_RO);
955 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
956 set_opt (sbi->s_mount_opt, ERRORS_CONT);
957 break;
958 case Opt_nouid32:
959 set_opt (sbi->s_mount_opt, NO_UID32);
960 break;
961 case Opt_nocheck:
962 clear_opt (sbi->s_mount_opt, CHECK);
963 break;
964 case Opt_debug:
965 set_opt (sbi->s_mount_opt, DEBUG);
966 break;
967 case Opt_oldalloc:
968 set_opt (sbi->s_mount_opt, OLDALLOC);
969 break;
970 case Opt_orlov:
971 clear_opt (sbi->s_mount_opt, OLDALLOC);
972 break;
617ba13b 973#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec
DK		 974 case Opt_user_xattr:
975 set_opt (sbi->s_mount_opt, XATTR_USER);
976 break;
977 case Opt_nouser_xattr:
978 clear_opt (sbi->s_mount_opt, XATTR_USER);
979 break;
980#else
981 case Opt_user_xattr:
982 case Opt_nouser_xattr:
617ba13b 983 printk("EXT4 (no)user_xattr options not supported\n");
ac27a0ec
DK		 984 break;
985#endif
617ba13b 986#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 987 case Opt_acl:
988 set_opt(sbi->s_mount_opt, POSIX_ACL);
989 break;
990 case Opt_noacl:
991 clear_opt(sbi->s_mount_opt, POSIX_ACL);
992 break;
993#else
994 case Opt_acl:
995 case Opt_noacl:
617ba13b 996 printk("EXT4 (no)acl options not supported\n");
ac27a0ec
DK		 997 break;
998#endif
999 case Opt_reservation:
1000 set_opt(sbi->s_mount_opt, RESERVATION);
1001 break;
1002 case Opt_noreservation:
1003 clear_opt(sbi->s_mount_opt, RESERVATION);
1004 break;
1005 case Opt_journal_update:
1006 /* @@@ FIXME */
1007 /* Eventually we will want to be able to create
1008 a journal file here. For now, only allow the
1009 user to specify an existing inode to be the
1010 journal file. */
1011 if (is_remount) {
617ba13b 1012 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1013 "journal on remount\n");
1014 return 0;
1015 }
1016 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1017 break;
1018 case Opt_journal_inum:
1019 if (is_remount) {
617ba13b 1020 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1021 "journal on remount\n");
1022 return 0;
1023 }
1024 if (match_int(&args[0], &option))
1025 return 0;
1026 *inum = option;
1027 break;
1028 case Opt_journal_dev:
1029 if (is_remount) {
617ba13b 1030 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1031 "journal on remount\n");
1032 return 0;
1033 }
1034 if (match_int(&args[0], &option))
1035 return 0;
1036 *journal_devnum = option;
1037 break;
1038 case Opt_noload:
1039 set_opt (sbi->s_mount_opt, NOLOAD);
1040 break;
1041 case Opt_commit:
1042 if (match_int(&args[0], &option))
1043 return 0;
1044 if (option < 0)
1045 return 0;
1046 if (option == 0)
cd02ff0b 1047 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1048 sbi->s_commit_interval = HZ * option;
1049 break;
1050 case Opt_data_journal:
617ba13b 1051 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1052 goto datacheck;
1053 case Opt_data_ordered:
617ba13b 1054 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1055 goto datacheck;
1056 case Opt_data_writeback:
617ba13b 1057 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1058 datacheck:
1059 if (is_remount) {
617ba13b 1060 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1061 != data_opt) {
1062 printk(KERN_ERR
617ba13b 1063 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1064 "mode on remount\n");
1065 return 0;
1066 }
1067 } else {
617ba13b 1068 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1069 sbi->s_mount_opt |= data_opt;
1070 }
1071 break;
1072#ifdef CONFIG_QUOTA
1073 case Opt_usrjquota:
1074 qtype = USRQUOTA;
1075 goto set_qf_name;
1076 case Opt_grpjquota:
1077 qtype = GRPQUOTA;
1078set_qf_name:
1079 if (sb_any_quota_enabled(sb)) {
1080 printk(KERN_ERR
617ba13b 1081 "EXT4-fs: Cannot change journalled "
ac27a0ec
DK		 1082 "quota options when quota turned on.\n");
1083 return 0;
1084 }
1085 qname = match_strdup(&args[0]);
1086 if (!qname) {
1087 printk(KERN_ERR
617ba13b 1088 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1089 "storing quotafile name.\n");
1090 return 0;
1091 }
1092 if (sbi->s_qf_names[qtype] &&
1093 strcmp(sbi->s_qf_names[qtype], qname)) {
1094 printk(KERN_ERR
617ba13b 1095 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1096 "specified.\n", QTYPE2NAME(qtype));
1097 kfree(qname);
1098 return 0;
1099 }
1100 sbi->s_qf_names[qtype] = qname;
1101 if (strchr(sbi->s_qf_names[qtype], '/')) {
1102 printk(KERN_ERR
617ba13b 1103 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1104 "filesystem root.\n");
1105 kfree(sbi->s_qf_names[qtype]);
1106 sbi->s_qf_names[qtype] = NULL;
1107 return 0;
1108 }
1109 set_opt(sbi->s_mount_opt, QUOTA);
1110 break;
1111 case Opt_offusrjquota:
1112 qtype = USRQUOTA;
1113 goto clear_qf_name;
1114 case Opt_offgrpjquota:
1115 qtype = GRPQUOTA;
1116clear_qf_name:
1117 if (sb_any_quota_enabled(sb)) {
617ba13b 1118 printk(KERN_ERR "EXT4-fs: Cannot change "
ac27a0ec
DK		 1119 "journalled quota options when "
1120 "quota turned on.\n");
1121 return 0;
1122 }
1123 /*
1124 * The space will be released later when all options
1125 * are confirmed to be correct
1126 */
1127 sbi->s_qf_names[qtype] = NULL;
1128 break;
1129 case Opt_jqfmt_vfsold:
1130 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1131 break;
1132 case Opt_jqfmt_vfsv0:
1133 sbi->s_jquota_fmt = QFMT_VFS_V0;
1134 break;
1135 case Opt_quota:
1136 case Opt_usrquota:
1137 set_opt(sbi->s_mount_opt, QUOTA);
1138 set_opt(sbi->s_mount_opt, USRQUOTA);
1139 break;
1140 case Opt_grpquota:
1141 set_opt(sbi->s_mount_opt, QUOTA);
1142 set_opt(sbi->s_mount_opt, GRPQUOTA);
1143 break;
1144 case Opt_noquota:
1145 if (sb_any_quota_enabled(sb)) {
617ba13b 1146 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1147 "options when quota turned on.\n");
1148 return 0;
1149 }
1150 clear_opt(sbi->s_mount_opt, QUOTA);
1151 clear_opt(sbi->s_mount_opt, USRQUOTA);
1152 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1153 break;
1154#else
1155 case Opt_quota:
1156 case Opt_usrquota:
1157 case Opt_grpquota:
1158 case Opt_usrjquota:
1159 case Opt_grpjquota:
1160 case Opt_offusrjquota:
1161 case Opt_offgrpjquota:
1162 case Opt_jqfmt_vfsold:
1163 case Opt_jqfmt_vfsv0:
1164 printk(KERN_ERR
617ba13b 1165 "EXT4-fs: journalled quota options not "
ac27a0ec
DK		 1166 "supported.\n");
1167 break;
1168 case Opt_noquota:
1169 break;
1170#endif
1171 case Opt_abort:
1172 set_opt(sbi->s_mount_opt, ABORT);
1173 break;
1174 case Opt_barrier:
1175 if (match_int(&args[0], &option))
1176 return 0;
1177 if (option)
1178 set_opt(sbi->s_mount_opt, BARRIER);
1179 else
1180 clear_opt(sbi->s_mount_opt, BARRIER);
1181 break;
1182 case Opt_ignore:
1183 break;
1184 case Opt_resize:
1185 if (!is_remount) {
617ba13b 1186 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1187 "for remount\n");
1188 return 0;
1189 }
1190 if (match_int(&args[0], &option) != 0)
1191 return 0;
1192 *n_blocks_count = option;
1193 break;
1194 case Opt_nobh:
1195 set_opt(sbi->s_mount_opt, NOBH);
1196 break;
1197 case Opt_bh:
1198 clear_opt(sbi->s_mount_opt, NOBH);
1199 break;
a86c6181
AT		 1200 case Opt_extents:
1201 set_opt (sbi->s_mount_opt, EXTENTS);
1202 break;
1e2462f9
MC		 1203 case Opt_noextents:
1204 clear_opt (sbi->s_mount_opt, EXTENTS);
1205 break;
ac27a0ec
DK		 1206 default:
1207 printk (KERN_ERR
617ba13b 1208 "EXT4-fs: Unrecognized mount option \"%s\" "
ac27a0ec
DK		 1209 "or missing value\n", p);
1210 return 0;
1211 }
1212 }
1213#ifdef CONFIG_QUOTA
1214 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1215 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1216 sbi->s_qf_names[USRQUOTA])
1217 clear_opt(sbi->s_mount_opt, USRQUOTA);
1218
617ba13b 1219 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1220 sbi->s_qf_names[GRPQUOTA])
1221 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1222
1223 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1224 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1225 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1226 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1227 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1228 "format mixing.\n");
1229 return 0;
1230 }
1231
1232 if (!sbi->s_jquota_fmt) {
617ba13b 1233 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1234 "not specified.\n");
1235 return 0;
1236 }
1237 } else {
1238 if (sbi->s_jquota_fmt) {
617ba13b 1239 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1240 "specified with no journalling "
1241 "enabled.\n");
1242 return 0;
1243 }
1244 }
1245#endif
1246 return 1;
1247}
1248
617ba13b 1249static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1250 int read_only)
1251{
617ba13b 1252 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1253 int res = 0;
1254
617ba13b
MC		 1255 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1256 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
ac27a0ec
DK		 1257 "forcing read-only mode\n");
1258 res = MS_RDONLY;
1259 }
1260 if (read_only)
1261 return res;
617ba13b
MC		 1262 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1263 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
ac27a0ec 1264 "running e2fsck is recommended\n");
617ba13b 1265 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
ac27a0ec 1266 printk (KERN_WARNING
617ba13b 1267 "EXT4-fs warning: mounting fs with errors, "
ac27a0ec
DK		 1268 "running e2fsck is recommended\n");
1269 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1270 le16_to_cpu(es->s_mnt_count) >=
1271 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1272 printk (KERN_WARNING
617ba13b 1273 "EXT4-fs warning: maximal mount count reached, "
ac27a0ec
DK		 1274 "running e2fsck is recommended\n");
1275 else if (le32_to_cpu(es->s_checkinterval) &&
1276 (le32_to_cpu(es->s_lastcheck) +
1277 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1278 printk (KERN_WARNING
617ba13b 1279 "EXT4-fs warning: checktime reached, "
ac27a0ec
DK		 1280 "running e2fsck is recommended\n");
1281#if 0
1282 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1283 * inconsistencies, to force a fsck at reboot. But for
1284 * a plain journaled filesystem we can keep it set as
1285 * valid forever! :)
1286 */
617ba13b 1287 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
ac27a0ec
DK		 1288#endif
1289 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1290 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
ac27a0ec
DK		 1291 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1292 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1293 ext4_update_dynamic_rev(sb);
1294 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1295
617ba13b 1296 ext4_commit_super(sb, es, 1);
ac27a0ec 1297 if (test_opt(sb, DEBUG))
617ba13b 1298 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1299 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1300 sb->s_blocksize,
1301 sbi->s_groups_count,
617ba13b
MC		 1302 EXT4_BLOCKS_PER_GROUP(sb),
1303 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1304 sbi->s_mount_opt);
1305
617ba13b
MC		 1306 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1307 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK		 1308 char b[BDEVNAME_SIZE];
1309
1310 printk("external journal on %s\n",
617ba13b 1311 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec
DK		 1312 } else {
1313 printk("internal journal\n");
1314 }
1315 return res;
1316}
1317
717d50e4
AD		 1318__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1319 struct ext4_group_desc *gdp)
1320{
1321 __u16 crc = 0;
1322
1323 if (sbi->s_es->s_feature_ro_compat &
1324 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1325 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1326 __le32 le_group = cpu_to_le32(block_group);
1327
1328 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1329 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1330 crc = crc16(crc, (__u8 *)gdp, offset);
1331 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1332 /* for checksum of struct ext4_group_desc do the rest...*/
1333 if ((sbi->s_es->s_feature_incompat &
1334 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1335 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1336 crc = crc16(crc, (__u8 *)gdp + offset,
1337 le16_to_cpu(sbi->s_es->s_desc_size) -
1338 offset);
1339 }
1340
1341 return cpu_to_le16(crc);
1342}
1343
1344int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1345 struct ext4_group_desc *gdp)
1346{
1347 if ((sbi->s_es->s_feature_ro_compat &
1348 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1349 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1350 return 0;
1351
1352 return 1;
1353}
1354
ac27a0ec 1355/* Called at mount-time, super-block is locked */
617ba13b 1356static int ext4_check_descriptors (struct super_block * sb)
ac27a0ec 1357{
617ba13b
MC		 1358 struct ext4_sb_info *sbi = EXT4_SB(sb);
1359 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1360 ext4_fsblk_t last_block;
bd81d8ee
LV		 1361 ext4_fsblk_t block_bitmap;
1362 ext4_fsblk_t inode_bitmap;
1363 ext4_fsblk_t inode_table;
617ba13b 1364 struct ext4_group_desc * gdp = NULL;
ac27a0ec 1365 int desc_block = 0;
ce421581 1366 int flexbg_flag = 0;
ac27a0ec
DK		 1367 int i;
1368
ce421581
JS		 1369 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1370 flexbg_flag = 1;
1371
617ba13b 1372 ext4_debug ("Checking group descriptors");
ac27a0ec
DK		 1373
1374 for (i = 0; i < sbi->s_groups_count; i++)
1375 {
ce421581 1376 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1377 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1378 else
1379 last_block = first_block +
617ba13b 1380 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1381
617ba13b
MC		 1382 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1383 gdp = (struct ext4_group_desc *)
ac27a0ec 1384 sbi->s_group_desc[desc_block++]->b_data;
8fadc143 1385 block_bitmap = ext4_block_bitmap(sb, gdp);
bd81d8ee 1386 if (block_bitmap < first_block || block_bitmap > last_block)
ac27a0ec 1387 {
617ba13b 1388 ext4_error (sb, "ext4_check_descriptors",
ac27a0ec 1389 "Block bitmap for group %d"
2ae02107 1390 " not in group (block %llu)!",
bd81d8ee 1391 i, block_bitmap);
ac27a0ec
DK		 1392 return 0;
1393 }
8fadc143 1394 inode_bitmap = ext4_inode_bitmap(sb, gdp);
bd81d8ee 1395 if (inode_bitmap < first_block || inode_bitmap > last_block)
ac27a0ec 1396 {
617ba13b 1397 ext4_error (sb, "ext4_check_descriptors",
ac27a0ec 1398 "Inode bitmap for group %d"
2ae02107 1399 " not in group (block %llu)!",
bd81d8ee 1400 i, inode_bitmap);
ac27a0ec
DK		 1401 return 0;
1402 }
8fadc143 1403 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1404 if (inode_table < first_block ||
780dcdb2 1405 inode_table + sbi->s_itb_per_group - 1 > last_block)
ac27a0ec 1406 {
617ba13b 1407 ext4_error (sb, "ext4_check_descriptors",
ac27a0ec 1408 "Inode table for group %d"
2ae02107 1409 " not in group (block %llu)!",
bd81d8ee 1410 i, inode_table);
ac27a0ec
DK		 1411 return 0;
1412 }
717d50e4
AD		 1413 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1414 ext4_error(sb, __FUNCTION__,
1415 "Checksum for group %d failed (%u!=%u)\n", i,
1416 le16_to_cpu(ext4_group_desc_csum(sbi, i,
1417 gdp)),
1418 le16_to_cpu(gdp->bg_checksum));
1419 return 0;
1420 }
ce421581
JS		 1421 if (!flexbg_flag)
1422 first_block += EXT4_BLOCKS_PER_GROUP(sb);
0d1ee42f
AR		 1423 gdp = (struct ext4_group_desc *)
1424 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
ac27a0ec
DK		 1425 }
1426
bd81d8ee 1427 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
617ba13b 1428 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1429 return 1;
1430}
1431
1432
617ba13b 1433/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1434 * the superblock) which were deleted from all directories, but held open by
1435 * a process at the time of a crash. We walk the list and try to delete these
1436 * inodes at recovery time (only with a read-write filesystem).
1437 *
1438 * In order to keep the orphan inode chain consistent during traversal (in
1439 * case of crash during recovery), we link each inode into the superblock
1440 * orphan list_head and handle it the same way as an inode deletion during
1441 * normal operation (which journals the operations for us).
1442 *
1443 * We only do an iget() and an iput() on each inode, which is very safe if we
1444 * accidentally point at an in-use or already deleted inode. The worst that
1445 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1446 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1447 * e2fsck was run on this filesystem, and it must have already done the orphan
1448 * inode cleanup for us, so we can safely abort without any further action.
1449 */
617ba13b
MC		 1450static void ext4_orphan_cleanup (struct super_block * sb,
1451 struct ext4_super_block * es)
ac27a0ec
DK		 1452{
1453 unsigned int s_flags = sb->s_flags;
1454 int nr_orphans = 0, nr_truncates = 0;
1455#ifdef CONFIG_QUOTA
1456 int i;
1457#endif
1458 if (!es->s_last_orphan) {
1459 jbd_debug(4, "no orphan inodes to clean up\n");
1460 return;
1461 }
1462
a8f48a95
ES		 1463 if (bdev_read_only(sb->s_bdev)) {
1464 printk(KERN_ERR "EXT4-fs: write access "
1465 "unavailable, skipping orphan cleanup.\n");
1466 return;
1467 }
1468
617ba13b 1469 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1470 if (es->s_last_orphan)
1471 jbd_debug(1, "Errors on filesystem, "
1472 "clearing orphan list.\n");
1473 es->s_last_orphan = 0;
1474 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1475 return;
1476 }
1477
1478 if (s_flags & MS_RDONLY) {
617ba13b 1479 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1480 sb->s_id);
1481 sb->s_flags &= ~MS_RDONLY;
1482 }
1483#ifdef CONFIG_QUOTA
1484 /* Needed for iput() to work correctly and not trash data */
1485 sb->s_flags |= MS_ACTIVE;
1486 /* Turn on quotas so that they are updated correctly */
1487 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1488 if (EXT4_SB(sb)->s_qf_names[i]) {
1489 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1490 if (ret < 0)
1491 printk(KERN_ERR
617ba13b 1492 "EXT4-fs: Cannot turn on journalled "
ac27a0ec
DK		 1493 "quota: error %d\n", ret);
1494 }
1495 }
1496#endif
1497
1498 while (es->s_last_orphan) {
1499 struct inode *inode;
1500
1501 if (!(inode =
617ba13b 1502 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
ac27a0ec
DK		 1503 es->s_last_orphan = 0;
1504 break;
1505 }
1506
617ba13b 1507 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1508 DQUOT_INIT(inode);
1509 if (inode->i_nlink) {
1510 printk(KERN_DEBUG
1511 "%s: truncating inode %lu to %Ld bytes\n",
1512 __FUNCTION__, inode->i_ino, inode->i_size);
1513 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1514 inode->i_ino, inode->i_size);
617ba13b 1515 ext4_truncate(inode);
ac27a0ec
DK		 1516 nr_truncates++;
1517 } else {
1518 printk(KERN_DEBUG
1519 "%s: deleting unreferenced inode %lu\n",
1520 __FUNCTION__, inode->i_ino);
1521 jbd_debug(2, "deleting unreferenced inode %lu\n",
1522 inode->i_ino);
1523 nr_orphans++;
1524 }
1525 iput(inode); /* The delete magic happens here! */
1526 }
1527
1528#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1529
1530 if (nr_orphans)
617ba13b 1531 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1532 sb->s_id, PLURAL(nr_orphans));
1533 if (nr_truncates)
617ba13b 1534 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1535 sb->s_id, PLURAL(nr_truncates));
1536#ifdef CONFIG_QUOTA
1537 /* Turn quotas off */
1538 for (i = 0; i < MAXQUOTAS; i++) {
1539 if (sb_dqopt(sb)->files[i])
1540 vfs_quota_off(sb, i);
1541 }
1542#endif
1543 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1544}
1545
ac27a0ec
DK		 1546/*
1547 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1548 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1549 * We need to be 1 filesystem block less than the 2^32 sector limit.
1550 */
617ba13b 1551static loff_t ext4_max_size(int bits)
ac27a0ec 1552{
617ba13b 1553 loff_t res = EXT4_NDIR_BLOCKS;
ac27a0ec
DK		 1554 /* This constant is calculated to be the largest file size for a
1555 * dense, 4k-blocksize file such that the total number of
1556 * sectors in the file, including data and all indirect blocks,
1557 * does not exceed 2^32. */
1558 const loff_t upper_limit = 0x1ff7fffd000LL;
1559
1560 res += 1LL << (bits-2);
1561 res += 1LL << (2*(bits-2));
1562 res += 1LL << (3*(bits-2));
1563 res <<= bits;
1564 if (res > upper_limit)
1565 res = upper_limit;
1566 return res;
1567}
1568
617ba13b 1569static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1570 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1571{
617ba13b 1572 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1573 unsigned long bg, first_meta_bg;
1574 int has_super = 0;
1575
1576 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1577
617ba13b 1578 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1579 nr < first_meta_bg)
70bbb3e0 1580 return logical_sb_block + nr + 1;
ac27a0ec 1581 bg = sbi->s_desc_per_block * nr;
617ba13b 1582 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1583 has_super = 1;
617ba13b 1584 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1585}
1586
1587
617ba13b 1588static int ext4_fill_super (struct super_block *sb, void *data, int silent)
ac27a0ec
DK		 1589{
1590 struct buffer_head * bh;
617ba13b
MC		 1591 struct ext4_super_block *es = NULL;
1592 struct ext4_sb_info *sbi;
1593 ext4_fsblk_t block;
1594 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1595 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1596 unsigned long offset = 0;
1597 unsigned int journal_inum = 0;
1598 unsigned long journal_devnum = 0;
1599 unsigned long def_mount_opts;
1600 struct inode *root;
1601 int blocksize;
1602 int hblock;
1603 int db_count;
1604 int i;
1605 int needs_recovery;
1606 __le32 features;
bd81d8ee 1607 __u64 blocks_count;
833f4077 1608 int err;
ac27a0ec
DK		 1609
1610 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1611 if (!sbi)
1612 return -ENOMEM;
1613 sb->s_fs_info = sbi;
1614 sbi->s_mount_opt = 0;
617ba13b
MC		 1615 sbi->s_resuid = EXT4_DEF_RESUID;
1616 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1617 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1618
1619 unlock_kernel();
1620
617ba13b 1621 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1622 if (!blocksize) {
617ba13b 1623 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1624 goto out_fail;
1625 }
1626
afc7cbca
TS		 1627 if (!sb_set_blocksize(sb, blocksize)) {
1628 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1629 goto out_fail;
1630 }
1631
ac27a0ec 1632 /*
617ba13b 1633 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1634 * block sizes. We need to calculate the offset from buffer start.
1635 */
617ba13b 1636 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1637 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1638 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1639 } else {
70bbb3e0 1640 logical_sb_block = sb_block;
ac27a0ec
DK		 1641 }
1642
70bbb3e0 1643 if (!(bh = sb_bread(sb, logical_sb_block))) {
617ba13b 1644 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1645 goto out_fail;
1646 }
1647 /*
1648 * Note: s_es must be initialized as soon as possible because
617ba13b 1649 * some ext4 macro-instructions depend on its value
ac27a0ec 1650 */
617ba13b 1651 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1652 sbi->s_es = es;
1653 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1654 if (sb->s_magic != EXT4_SUPER_MAGIC)
1655 goto cantfind_ext4;
ac27a0ec
DK		 1656
1657 /* Set defaults before we parse the mount options */
1658 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1659 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1660 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1661 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1662 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1663 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1664 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1665#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1666 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1667 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1668#endif
1669#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1670 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1671 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1672#endif
617ba13b
MC		 1673 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1674 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1675 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1676 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1677 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1678 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1679
1680 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1681 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
617ba13b 1682 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
ac27a0ec 1683 set_opt(sbi->s_mount_opt, ERRORS_RO);
ceea16bf
DM		 1684 else
1685 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1686
1687 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1688 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1689
1690 set_opt(sbi->s_mount_opt, RESERVATION);
1691
1e2462f9
MC		 1692 /*
1693 * turn on extents feature by default in ext4 filesystem
1694 * User -o noextents to turn it off
1695 */
1696 set_opt(sbi->s_mount_opt, EXTENTS);
1697
ac27a0ec
DK		 1698 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1699 NULL, 0))
1700 goto failed_mount;
1701
1702 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 1703 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 1704
617ba13b
MC		 1705 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1706 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1707 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1708 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 1709 printk(KERN_WARNING
617ba13b 1710 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec
DK		 1711 "running e2fsck is recommended\n");
1712 /*
1713 * Check feature flags regardless of the revision level, since we
1714 * previously didn't change the revision level when setting the flags,
1715 * so there is a chance incompat flags are set on a rev 0 filesystem.
1716 */
617ba13b 1717 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 1718 if (features) {
617ba13b 1719 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 1720 "unsupported optional features (%x).\n",
1721 sb->s_id, le32_to_cpu(features));
1722 goto failed_mount;
1723 }
617ba13b 1724 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 1725 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 1726 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 1727 "unsupported optional features (%x).\n",
1728 sb->s_id, le32_to_cpu(features));
1729 goto failed_mount;
1730 }
1731 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1732
617ba13b
MC		 1733 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1734 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 1735 printk(KERN_ERR
617ba13b 1736 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 1737 blocksize, sb->s_id);
1738 goto failed_mount;
1739 }
1740
1741 hblock = bdev_hardsect_size(sb->s_bdev);
1742 if (sb->s_blocksize != blocksize) {
1743 /*
1744 * Make sure the blocksize for the filesystem is larger
1745 * than the hardware sectorsize for the machine.
1746 */
1747 if (blocksize < hblock) {
617ba13b 1748 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
ac27a0ec
DK		 1749 "device blocksize %d.\n", blocksize, hblock);
1750 goto failed_mount;
1751 }
1752
1753 brelse (bh);
1754 sb_set_blocksize(sb, blocksize);
70bbb3e0
AM		 1755 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1756 offset = do_div(logical_sb_block, blocksize);
1757 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 1758 if (!bh) {
1759 printk(KERN_ERR
617ba13b 1760 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 1761 goto failed_mount;
1762 }
617ba13b 1763 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 1764 sbi->s_es = es;
617ba13b 1765 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
ac27a0ec 1766 printk (KERN_ERR
617ba13b 1767 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 1768 goto failed_mount;
1769 }
1770 }
1771
617ba13b 1772 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 1773
617ba13b
MC		 1774 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1775 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1776 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 1777 } else {
1778 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1779 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 1780 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 1781 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec
DK		 1782 (sbi->s_inode_size > blocksize)) {
1783 printk (KERN_ERR
617ba13b 1784 "EXT4-fs: unsupported inode size: %d\n",
ac27a0ec
DK		 1785 sbi->s_inode_size);
1786 goto failed_mount;
1787 }
ef7f3835
KS		 1788 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1789 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 1790 }
0d1ee42f
AR		 1791 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1792 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 1793 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 1794 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 1795 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 1796 printk(KERN_ERR
8fadc143 1797 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 1798 sbi->s_desc_size);
1799 goto failed_mount;
1800 }
1801 } else
1802 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 1803 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 1804 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1805 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 1806 goto cantfind_ext4;
1807 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 1808 if (sbi->s_inodes_per_block == 0)
617ba13b 1809 goto cantfind_ext4;
ac27a0ec
DK		 1810 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1811 sbi->s_inodes_per_block;
0d1ee42f 1812 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 1813 sbi->s_sbh = bh;
1814 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 1815 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1816 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
ac27a0ec
DK		 1817 for (i=0; i < 4; i++)
1818 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1819 sbi->s_def_hash_version = es->s_def_hash_version;
1820
1821 if (sbi->s_blocks_per_group > blocksize * 8) {
1822 printk (KERN_ERR
617ba13b 1823 "EXT4-fs: #blocks per group too big: %lu\n",
ac27a0ec
DK		 1824 sbi->s_blocks_per_group);
1825 goto failed_mount;
1826 }
ac27a0ec
DK		 1827 if (sbi->s_inodes_per_group > blocksize * 8) {
1828 printk (KERN_ERR
617ba13b 1829 "EXT4-fs: #inodes per group too big: %lu\n",
ac27a0ec
DK		 1830 sbi->s_inodes_per_group);
1831 goto failed_mount;
1832 }
1833
bd81d8ee 1834 if (ext4_blocks_count(es) >
ac27a0ec 1835 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 1836 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 1837 " too large to mount safely\n", sb->s_id);
1838 if (sizeof(sector_t) < 8)
617ba13b 1839 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 1840 "enabled\n");
1841 goto failed_mount;
1842 }
1843
617ba13b
MC		 1844 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1845 goto cantfind_ext4;
bd81d8ee
LV		 1846 blocks_count = (ext4_blocks_count(es) -
1847 le32_to_cpu(es->s_first_data_block) +
1848 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1849 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1850 sbi->s_groups_count = blocks_count;
617ba13b
MC		 1851 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1852 EXT4_DESC_PER_BLOCK(sb);
ac27a0ec
DK		 1853 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1854 GFP_KERNEL);
1855 if (sbi->s_group_desc == NULL) {
617ba13b 1856 printk (KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 1857 goto failed_mount;
1858 }
1859
1860 bgl_lock_init(&sbi->s_blockgroup_lock);
1861
1862 for (i = 0; i < db_count; i++) {
70bbb3e0 1863 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 1864 sbi->s_group_desc[i] = sb_bread(sb, block);
1865 if (!sbi->s_group_desc[i]) {
617ba13b 1866 printk (KERN_ERR "EXT4-fs: "
ac27a0ec
DK		 1867 "can't read group descriptor %d\n", i);
1868 db_count = i;
1869 goto failed_mount2;
1870 }
1871 }
617ba13b
MC		 1872 if (!ext4_check_descriptors (sb)) {
1873 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 1874 goto failed_mount2;
1875 }
1876 sbi->s_gdb_count = db_count;
1877 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1878 spin_lock_init(&sbi->s_next_gen_lock);
1879
833f4077
PZ		 1880 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1881 ext4_count_free_blocks(sb));
1882 if (!err) {
1883 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1884 ext4_count_free_inodes(sb));
1885 }
1886 if (!err) {
1887 err = percpu_counter_init(&sbi->s_dirs_counter,
1888 ext4_count_dirs(sb));
1889 }
1890 if (err) {
1891 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
1892 goto failed_mount3;
1893 }
ac27a0ec
DK		 1894
1895 /* per fileystem reservation list head & lock */
1896 spin_lock_init(&sbi->s_rsv_window_lock);
1897 sbi->s_rsv_window_root = RB_ROOT;
1898 /* Add a single, static dummy reservation to the start of the
1899 * reservation window list --- it gives us a placeholder for
1900 * append-at-start-of-list which makes the allocation logic
1901 * _much_ simpler. */
617ba13b
MC		 1902 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1903 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 1904 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1905 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 1906 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec
DK		 1907
1908 /*
1909 * set up enough so that it can read an inode
1910 */
617ba13b
MC		 1911 sb->s_op = &ext4_sops;
1912 sb->s_export_op = &ext4_export_ops;
1913 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 1914#ifdef CONFIG_QUOTA
617ba13b
MC		 1915 sb->s_qcop = &ext4_qctl_operations;
1916 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 1917#endif
1918 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1919
1920 sb->s_root = NULL;
1921
1922 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 1923 EXT4_HAS_INCOMPAT_FEATURE(sb,
1924 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 1925
1926 /*
1927 * The first inode we look at is the journal inode. Don't try
1928 * root first: it may be modified in the journal!
1929 */
1930 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 1931 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1932 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec
DK		 1933 goto failed_mount3;
1934 } else if (journal_inum) {
617ba13b 1935 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 1936 goto failed_mount3;
1937 } else {
1938 if (!silent)
1939 printk (KERN_ERR
617ba13b 1940 "ext4: No journal on filesystem on %s\n",
ac27a0ec
DK		 1941 sb->s_id);
1942 goto failed_mount3;
1943 }
1944
eb40a09c
JS		 1945 if (ext4_blocks_count(es) > 0xffffffffULL &&
1946 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
1947 JBD2_FEATURE_INCOMPAT_64BIT)) {
1948 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
1949 goto failed_mount4;
1950 }
1951
ac27a0ec
DK		 1952 /* We have now updated the journal if required, so we can
1953 * validate the data journaling mode. */
1954 switch (test_opt(sb, DATA_FLAGS)) {
1955 case 0:
1956 /* No mode set, assume a default based on the journal
63f57933
AM		 1957 * capabilities: ORDERED_DATA if the journal can
1958 * cope, else JOURNAL_DATA
1959 */
dab291af
MC		 1960 if (jbd2_journal_check_available_features
1961 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 1962 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1963 else
1964 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1965 break;
1966
617ba13b
MC		 1967 case EXT4_MOUNT_ORDERED_DATA:
1968 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 1969 if (!jbd2_journal_check_available_features
1970 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 1971 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 1972 "requested data journaling mode\n");
1973 goto failed_mount4;
1974 }
1975 default:
1976 break;
1977 }
1978
1979 if (test_opt(sb, NOBH)) {
617ba13b
MC		 1980 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1981 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 1982 "its supported only with writeback mode\n");
1983 clear_opt(sbi->s_mount_opt, NOBH);
1984 }
1985 }
1986 /*
dab291af 1987 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 1988 * so we can safely mount the rest of the filesystem now.
1989 */
1990
617ba13b 1991 root = iget(sb, EXT4_ROOT_INO);
ac27a0ec
DK		 1992 sb->s_root = d_alloc_root(root);
1993 if (!sb->s_root) {
617ba13b 1994 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
ac27a0ec
DK		 1995 iput(root);
1996 goto failed_mount4;
1997 }
1998 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1999 dput(sb->s_root);
2000 sb->s_root = NULL;
617ba13b 2001 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2002 goto failed_mount4;
2003 }
2004
617ba13b 2005 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2006
2007 /* determine the minimum size of new large inodes, if present */
2008 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2009 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2010 EXT4_GOOD_OLD_INODE_SIZE;
2011 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2012 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2013 if (sbi->s_want_extra_isize <
2014 le16_to_cpu(es->s_want_extra_isize))
2015 sbi->s_want_extra_isize =
2016 le16_to_cpu(es->s_want_extra_isize);
2017 if (sbi->s_want_extra_isize <
2018 le16_to_cpu(es->s_min_extra_isize))
2019 sbi->s_want_extra_isize =
2020 le16_to_cpu(es->s_min_extra_isize);
2021 }
2022 }
2023 /* Check if enough inode space is available */
2024 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2025 sbi->s_inode_size) {
2026 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2027 EXT4_GOOD_OLD_INODE_SIZE;
2028 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2029 "available.\n");
2030 }
2031
ac27a0ec
DK		 2032 /*
2033 * akpm: core read_super() calls in here with the superblock locked.
2034 * That deadlocks, because orphan cleanup needs to lock the superblock
2035 * in numerous places. Here we just pop the lock - it's relatively
2036 * harmless, because we are now ready to accept write_super() requests,
2037 * and aviro says that's the only reason for hanging onto the
2038 * superblock lock.
2039 */
617ba13b
MC		 2040 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2041 ext4_orphan_cleanup(sb, es);
2042 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2043 if (needs_recovery)
617ba13b
MC		 2044 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2045 ext4_mark_recovery_complete(sb, es);
2046 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2047 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2048 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
ac27a0ec
DK		 2049 "writeback");
2050
a86c6181
AT		 2051 ext4_ext_init(sb);
2052
ac27a0ec
DK		 2053 lock_kernel();
2054 return 0;
2055
617ba13b 2056cantfind_ext4:
ac27a0ec 2057 if (!silent)
617ba13b 2058 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2059 sb->s_id);
2060 goto failed_mount;
2061
2062failed_mount4:
dab291af 2063 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec
DK		 2064failed_mount3:
2065 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2066 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2067 percpu_counter_destroy(&sbi->s_dirs_counter);
2068failed_mount2:
2069 for (i = 0; i < db_count; i++)
2070 brelse(sbi->s_group_desc[i]);
2071 kfree(sbi->s_group_desc);
2072failed_mount:
2073#ifdef CONFIG_QUOTA
2074 for (i = 0; i < MAXQUOTAS; i++)
2075 kfree(sbi->s_qf_names[i]);
2076#endif
617ba13b 2077 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2078 brelse(bh);
2079out_fail:
2080 sb->s_fs_info = NULL;
2081 kfree(sbi);
2082 lock_kernel();
2083 return -EINVAL;
2084}
2085
2086/*
2087 * Setup any per-fs journal parameters now. We'll do this both on
2088 * initial mount, once the journal has been initialised but before we've
2089 * done any recovery; and again on any subsequent remount.
2090 */
617ba13b 2091static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2092{
617ba13b 2093 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2094
2095 if (sbi->s_commit_interval)
2096 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2097 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2098 * interval here, but for now we'll just fall back to the jbd
2099 * default. */
2100
2101 spin_lock(&journal->j_state_lock);
2102 if (test_opt(sb, BARRIER))
dab291af 2103 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2104 else
dab291af 2105 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2106 spin_unlock(&journal->j_state_lock);
2107}
2108
617ba13b 2109static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2110 unsigned int journal_inum)
2111{
2112 struct inode *journal_inode;
2113 journal_t *journal;
2114
2115 /* First, test for the existence of a valid inode on disk. Bad
2116 * things happen if we iget() an unused inode, as the subsequent
2117 * iput() will try to delete it. */
2118
2119 journal_inode = iget(sb, journal_inum);
2120 if (!journal_inode) {
617ba13b 2121 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2122 return NULL;
2123 }
2124 if (!journal_inode->i_nlink) {
2125 make_bad_inode(journal_inode);
2126 iput(journal_inode);
617ba13b 2127 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2128 return NULL;
2129 }
2130
2131 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2132 journal_inode, journal_inode->i_size);
2133 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
617ba13b 2134 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2135 iput(journal_inode);
2136 return NULL;
2137 }
2138
dab291af 2139 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2140 if (!journal) {
617ba13b 2141 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2142 iput(journal_inode);
2143 return NULL;
2144 }
2145 journal->j_private = sb;
617ba13b 2146 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2147 return journal;
2148}
2149
617ba13b 2150static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2151 dev_t j_dev)
2152{
2153 struct buffer_head * bh;
2154 journal_t *journal;
617ba13b
MC		 2155 ext4_fsblk_t start;
2156 ext4_fsblk_t len;
ac27a0ec 2157 int hblock, blocksize;
617ba13b 2158 ext4_fsblk_t sb_block;
ac27a0ec 2159 unsigned long offset;
617ba13b 2160 struct ext4_super_block * es;
ac27a0ec
DK		 2161 struct block_device *bdev;
2162
617ba13b 2163 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2164 if (bdev == NULL)
2165 return NULL;
2166
2167 if (bd_claim(bdev, sb)) {
2168 printk(KERN_ERR
8c55e204 2169 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2170 blkdev_put(bdev);
2171 return NULL;
2172 }
2173
2174 blocksize = sb->s_blocksize;
2175 hblock = bdev_hardsect_size(bdev);
2176 if (blocksize < hblock) {
2177 printk(KERN_ERR
617ba13b 2178 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2179 goto out_bdev;
2180 }
2181
617ba13b
MC		 2182 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2183 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2184 set_blocksize(bdev, blocksize);
2185 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2186 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2187 "external journal\n");
2188 goto out_bdev;
2189 }
2190
617ba13b
MC		 2191 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2192 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2193 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2194 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2195 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2196 "bad superblock\n");
2197 brelse(bh);
2198 goto out_bdev;
2199 }
2200
617ba13b
MC		 2201 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2202 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2203 brelse(bh);
2204 goto out_bdev;
2205 }
2206
bd81d8ee 2207 len = ext4_blocks_count(es);
ac27a0ec
DK		 2208 start = sb_block + 1;
2209 brelse(bh); /* we're done with the superblock */
2210
dab291af 2211 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2212 start, len, blocksize);
2213 if (!journal) {
617ba13b 2214 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2215 goto out_bdev;
2216 }
2217 journal->j_private = sb;
2218 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2219 wait_on_buffer(journal->j_sb_buffer);
2220 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2221 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2222 goto out_journal;
2223 }
2224 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2225 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2226 "user (unsupported) - %d\n",
2227 be32_to_cpu(journal->j_superblock->s_nr_users));
2228 goto out_journal;
2229 }
617ba13b
MC		 2230 EXT4_SB(sb)->journal_bdev = bdev;
2231 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2232 return journal;
2233out_journal:
dab291af 2234 jbd2_journal_destroy(journal);
ac27a0ec 2235out_bdev:
617ba13b 2236 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2237 return NULL;
2238}
2239
617ba13b
MC		 2240static int ext4_load_journal(struct super_block *sb,
2241 struct ext4_super_block *es,
ac27a0ec
DK		 2242 unsigned long journal_devnum)
2243{
2244 journal_t *journal;
2245 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2246 dev_t journal_dev;
2247 int err = 0;
2248 int really_read_only;
2249
2250 if (journal_devnum &&
2251 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2252 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2253 "numbers have changed\n");
2254 journal_dev = new_decode_dev(journal_devnum);
2255 } else
2256 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2257
2258 really_read_only = bdev_read_only(sb->s_bdev);
2259
2260 /*
2261 * Are we loading a blank journal or performing recovery after a
2262 * crash? For recovery, we need to check in advance whether we
2263 * can get read-write access to the device.
2264 */
2265
617ba13b 2266 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2267 if (sb->s_flags & MS_RDONLY) {
617ba13b 2268 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2269 "required on readonly filesystem.\n");
2270 if (really_read_only) {
617ba13b 2271 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2272 "unavailable, cannot proceed.\n");
2273 return -EROFS;
2274 }
617ba13b 2275 printk (KERN_INFO "EXT4-fs: write access will "
ac27a0ec
DK		 2276 "be enabled during recovery.\n");
2277 }
2278 }
2279
2280 if (journal_inum && journal_dev) {
617ba13b 2281 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2282 "and inode journals!\n");
2283 return -EINVAL;
2284 }
2285
2286 if (journal_inum) {
617ba13b 2287 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2288 return -EINVAL;
2289 } else {
617ba13b 2290 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2291 return -EINVAL;
2292 }
2293
2294 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2295 err = jbd2_journal_update_format(journal);
ac27a0ec 2296 if (err) {
617ba13b 2297 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2298 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2299 return err;
2300 }
2301 }
2302
617ba13b 2303 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2304 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2305 if (!err)
dab291af 2306 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2307
2308 if (err) {
617ba13b 2309 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2310 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2311 return err;
2312 }
2313
617ba13b
MC		 2314 EXT4_SB(sb)->s_journal = journal;
2315 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2316
2317 if (journal_devnum &&
2318 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2319 es->s_journal_dev = cpu_to_le32(journal_devnum);
2320 sb->s_dirt = 1;
2321
2322 /* Make sure we flush the recovery flag to disk. */
617ba13b 2323 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2324 }
2325
2326 return 0;
2327}
2328
617ba13b
MC		 2329static int ext4_create_journal(struct super_block * sb,
2330 struct ext4_super_block * es,
ac27a0ec
DK		 2331 unsigned int journal_inum)
2332{
2333 journal_t *journal;
6c675bd4 2334 int err;
ac27a0ec
DK		 2335
2336 if (sb->s_flags & MS_RDONLY) {
617ba13b 2337 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2338 "create journal.\n");
2339 return -EROFS;
2340 }
2341
6c675bd4
BP		 2342 journal = ext4_get_journal(sb, journal_inum);
2343 if (!journal)
ac27a0ec
DK		 2344 return -EINVAL;
2345
617ba13b 2346 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2347 journal_inum);
2348
6c675bd4
BP		 2349 err = jbd2_journal_create(journal);
2350 if (err) {
617ba13b 2351 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2352 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2353 return -EIO;
2354 }
2355
617ba13b 2356 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2357
617ba13b
MC		 2358 ext4_update_dynamic_rev(sb);
2359 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2360 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2361
2362 es->s_journal_inum = cpu_to_le32(journal_inum);
2363 sb->s_dirt = 1;
2364
2365 /* Make sure we flush the recovery flag to disk. */
617ba13b 2366 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2367
2368 return 0;
2369}
2370
617ba13b
MC		 2371static void ext4_commit_super (struct super_block * sb,
2372 struct ext4_super_block * es,
ac27a0ec
DK		 2373 int sync)
2374{
617ba13b 2375 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2376
2377 if (!sbh)
2378 return;
2379 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2380 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2381 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2382 BUFFER_TRACE(sbh, "marking dirty");
2383 mark_buffer_dirty(sbh);
2384 if (sync)
2385 sync_dirty_buffer(sbh);
2386}
2387
2388
2389/*
2390 * Have we just finished recovery? If so, and if we are mounting (or
2391 * remounting) the filesystem readonly, then we will end up with a
2392 * consistent fs on disk. Record that fact.
2393 */
617ba13b
MC		 2394static void ext4_mark_recovery_complete(struct super_block * sb,
2395 struct ext4_super_block * es)
ac27a0ec 2396{
617ba13b 2397 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2398
dab291af
MC		 2399 jbd2_journal_lock_updates(journal);
2400 jbd2_journal_flush(journal);
32c37730 2401 lock_super(sb);
617ba13b 2402 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2403 sb->s_flags & MS_RDONLY) {
617ba13b 2404 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2405 sb->s_dirt = 0;
617ba13b 2406 ext4_commit_super(sb, es, 1);
ac27a0ec 2407 }
32c37730 2408 unlock_super(sb);
dab291af 2409 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2410}
2411
2412/*
2413 * If we are mounting (or read-write remounting) a filesystem whose journal
2414 * has recorded an error from a previous lifetime, move that error to the
2415 * main filesystem now.
2416 */
617ba13b
MC		 2417static void ext4_clear_journal_err(struct super_block * sb,
2418 struct ext4_super_block * es)
ac27a0ec
DK		 2419{
2420 journal_t *journal;
2421 int j_errno;
2422 const char *errstr;
2423
617ba13b 2424 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2425
2426 /*
2427 * Now check for any error status which may have been recorded in the
617ba13b 2428 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2429 */
2430
dab291af 2431 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2432 if (j_errno) {
2433 char nbuf[16];
2434
617ba13b
MC		 2435 errstr = ext4_decode_error(sb, j_errno, nbuf);
2436 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
ac27a0ec 2437 "from previous mount: %s", errstr);
617ba13b 2438 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
ac27a0ec
DK		 2439 "filesystem check.");
2440
617ba13b
MC		 2441 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2442 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2443 ext4_commit_super (sb, es, 1);
ac27a0ec 2444
dab291af 2445 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2446 }
2447}
2448
2449/*
2450 * Force the running and committing transactions to commit,
2451 * and wait on the commit.
2452 */
617ba13b 2453int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2454{
2455 journal_t *journal;
2456 int ret;
2457
2458 if (sb->s_flags & MS_RDONLY)
2459 return 0;
2460
617ba13b 2461 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2462 sb->s_dirt = 0;
617ba13b 2463 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2464 return ret;
2465}
2466
2467/*
617ba13b 2468 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2469 * have to propagate any other updates to the superblock on disk at this
2470 * point. Just start an async writeback to get the buffers on their way
2471 * to the disk.
2472 *
2473 * This implicitly triggers the writebehind on sync().
2474 */
2475
617ba13b 2476static void ext4_write_super (struct super_block * sb)
ac27a0ec
DK		 2477{
2478 if (mutex_trylock(&sb->s_lock) != 0)
2479 BUG();
2480 sb->s_dirt = 0;
2481}
2482
617ba13b 2483static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2484{
2485 tid_t target;
2486
2487 sb->s_dirt = 0;
dab291af 2488 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2489 if (wait)
dab291af 2490 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2491 }
2492 return 0;
2493}
2494
2495/*
2496 * LVM calls this function before a (read-only) snapshot is created. This
2497 * gives us a chance to flush the journal completely and mark the fs clean.
2498 */
617ba13b 2499static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2500{
2501 sb->s_dirt = 0;
2502
2503 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2504 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2505
2506 /* Now we set up the journal barrier. */
dab291af
MC		 2507 jbd2_journal_lock_updates(journal);
2508 jbd2_journal_flush(journal);
ac27a0ec
DK		 2509
2510 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2511 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2512 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2513 }
2514}
2515
2516/*
2517 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2518 * flag here, even though the filesystem is not technically dirty yet.
2519 */
617ba13b 2520static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2521{
2522 if (!(sb->s_flags & MS_RDONLY)) {
2523 lock_super(sb);
2524 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2525 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2526 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2527 unlock_super(sb);
dab291af 2528 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2529 }
2530}
2531
617ba13b 2532static int ext4_remount (struct super_block * sb, int * flags, char * data)
ac27a0ec 2533{
617ba13b
MC		 2534 struct ext4_super_block * es;
2535 struct ext4_sb_info *sbi = EXT4_SB(sb);
2536 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2537 unsigned long old_sb_flags;
617ba13b 2538 struct ext4_mount_options old_opts;
ac27a0ec
DK		 2539 int err;
2540#ifdef CONFIG_QUOTA
2541 int i;
2542#endif
2543
2544 /* Store the original options */
2545 old_sb_flags = sb->s_flags;
2546 old_opts.s_mount_opt = sbi->s_mount_opt;
2547 old_opts.s_resuid = sbi->s_resuid;
2548 old_opts.s_resgid = sbi->s_resgid;
2549 old_opts.s_commit_interval = sbi->s_commit_interval;
2550#ifdef CONFIG_QUOTA
2551 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2552 for (i = 0; i < MAXQUOTAS; i++)
2553 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2554#endif
2555
2556 /*
2557 * Allow the "check" option to be passed as a remount option.
2558 */
2559 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2560 err = -EINVAL;
2561 goto restore_opts;
2562 }
2563
617ba13b
MC		 2564 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2565 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
ac27a0ec
DK		 2566
2567 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2568 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 2569
2570 es = sbi->s_es;
2571
617ba13b 2572 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 2573
2574 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 2575 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 2576 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 2577 err = -EROFS;
2578 goto restore_opts;
2579 }
2580
2581 if (*flags & MS_RDONLY) {
2582 /*
2583 * First of all, the unconditional stuff we have to do
2584 * to disable replay of the journal when we next remount
2585 */
2586 sb->s_flags |= MS_RDONLY;
2587
2588 /*
2589 * OK, test if we are remounting a valid rw partition
2590 * readonly, and if so set the rdonly flag and then
2591 * mark the partition as valid again.
2592 */
617ba13b
MC		 2593 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2594 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 2595 es->s_state = cpu_to_le16(sbi->s_mount_state);
2596
32c37730
JK		 2597 /*
2598 * We have to unlock super so that we can wait for
2599 * transactions.
2600 */
2601 unlock_super(sb);
617ba13b 2602 ext4_mark_recovery_complete(sb, es);
32c37730 2603 lock_super(sb);
ac27a0ec
DK		 2604 } else {
2605 __le32 ret;
617ba13b
MC		 2606 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2607 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2608 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 2609 "remount RDWR because of unsupported "
2610 "optional features (%x).\n",
2611 sb->s_id, le32_to_cpu(ret));
2612 err = -EROFS;
2613 goto restore_opts;
2614 }
ead6596b
ES		 2615
2616 /*
2617 * If we have an unprocessed orphan list hanging
2618 * around from a previously readonly bdev mount,
2619 * require a full umount/remount for now.
2620 */
2621 if (es->s_last_orphan) {
2622 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2623 "remount RDWR because of unprocessed "
2624 "orphan inode list. Please "
2625 "umount/remount instead.\n",
2626 sb->s_id);
2627 err = -EINVAL;
2628 goto restore_opts;
2629 }
2630
ac27a0ec
DK		 2631 /*
2632 * Mounting a RDONLY partition read-write, so reread
2633 * and store the current valid flag. (It may have
2634 * been changed by e2fsck since we originally mounted
2635 * the partition.)
2636 */
617ba13b 2637 ext4_clear_journal_err(sb, es);
ac27a0ec 2638 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 2639 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 2640 goto restore_opts;
617ba13b 2641 if (!ext4_setup_super (sb, es, 0))
ac27a0ec
DK		 2642 sb->s_flags &= ~MS_RDONLY;
2643 }
2644 }
2645#ifdef CONFIG_QUOTA
2646 /* Release old quota file names */
2647 for (i = 0; i < MAXQUOTAS; i++)
2648 if (old_opts.s_qf_names[i] &&
2649 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2650 kfree(old_opts.s_qf_names[i]);
2651#endif
2652 return 0;
2653restore_opts:
2654 sb->s_flags = old_sb_flags;
2655 sbi->s_mount_opt = old_opts.s_mount_opt;
2656 sbi->s_resuid = old_opts.s_resuid;
2657 sbi->s_resgid = old_opts.s_resgid;
2658 sbi->s_commit_interval = old_opts.s_commit_interval;
2659#ifdef CONFIG_QUOTA
2660 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2661 for (i = 0; i < MAXQUOTAS; i++) {
2662 if (sbi->s_qf_names[i] &&
2663 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2664 kfree(sbi->s_qf_names[i]);
2665 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2666 }
2667#endif
2668 return err;
2669}
2670
617ba13b 2671static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
ac27a0ec
DK		 2672{
2673 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 2674 struct ext4_sb_info *sbi = EXT4_SB(sb);
2675 struct ext4_super_block *es = sbi->s_es;
960cc398 2676 u64 fsid;
ac27a0ec 2677
5e70030d
BP		 2678 if (test_opt(sb, MINIX_DF)) {
2679 sbi->s_overhead_last = 0;
6bc9feff 2680 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
5e70030d
BP		 2681 unsigned long ngroups = sbi->s_groups_count, i;
2682 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 2683 smp_rmb();
2684
2685 /*
5e70030d
BP		 2686 * Compute the overhead (FS structures). This is constant
2687 * for a given filesystem unless the number of block groups
2688 * changes so we cache the previous value until it does.
ac27a0ec
DK		 2689 */
2690
2691 /*
2692 * All of the blocks before first_data_block are
2693 * overhead
2694 */
2695 overhead = le32_to_cpu(es->s_first_data_block);
2696
2697 /*
2698 * Add the overhead attributed to the superblock and
2699 * block group descriptors. If the sparse superblocks
2700 * feature is turned on, then not all groups have this.
2701 */
2702 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 2703 overhead += ext4_bg_has_super(sb, i) +
2704 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 2705 cond_resched();
2706 }
2707
2708 /*
2709 * Every block group has an inode bitmap, a block
2710 * bitmap, and an inode table.
2711 */
5e70030d
BP		 2712 overhead += ngroups * (2 + sbi->s_itb_per_group);
2713 sbi->s_overhead_last = overhead;
2714 smp_wmb();
6bc9feff 2715 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 2716 }
2717
617ba13b 2718 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 2719 buf->f_bsize = sb->s_blocksize;
5e70030d 2720 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
52d9f3b4 2721 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
308ba3ec 2722 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 2723 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2724 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 2725 buf->f_bavail = 0;
2726 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2727 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 2728 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 2729 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 2730 fsid = le64_to_cpup((void *)es->s_uuid) ^
2731 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2732 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2733 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 2734 return 0;
2735}
2736
2737/* Helper function for writing quotas on sync - we need to start transaction before quota file
2738 * is locked for write. Otherwise the are possible deadlocks:
2739 * Process 1 Process 2
617ba13b 2740 * ext4_create() quota_sync()
dab291af 2741 * jbd2_journal_start() write_dquot()
ac27a0ec 2742 * DQUOT_INIT() down(dqio_mutex)
dab291af 2743 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 2744 *
2745 */
2746
2747#ifdef CONFIG_QUOTA
2748
2749static inline struct inode *dquot_to_inode(struct dquot *dquot)
2750{
2751 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2752}
2753
617ba13b 2754static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 2755{
2756 handle_t *handle;
2757 int ret, err;
2758
2759 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 2760 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 2761 if (IS_ERR(handle))
2762 return PTR_ERR(handle);
2763 ret = dquot_initialize(inode, type);
617ba13b 2764 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2765 if (!ret)
2766 ret = err;
2767 return ret;
2768}
2769
617ba13b 2770static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 2771{
2772 handle_t *handle;
2773 int ret, err;
2774
2775 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 2776 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
ac27a0ec
DK		 2777 if (IS_ERR(handle))
2778 return PTR_ERR(handle);
2779 ret = dquot_drop(inode);
617ba13b 2780 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2781 if (!ret)
2782 ret = err;
2783 return ret;
2784}
2785
617ba13b 2786static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 2787{
2788 int ret, err;
2789 handle_t *handle;
2790 struct inode *inode;
2791
2792 inode = dquot_to_inode(dquot);
617ba13b
MC		 2793 handle = ext4_journal_start(inode,
2794 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 2795 if (IS_ERR(handle))
2796 return PTR_ERR(handle);
2797 ret = dquot_commit(dquot);
617ba13b 2798 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2799 if (!ret)
2800 ret = err;
2801 return ret;
2802}
2803
617ba13b 2804static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 2805{
2806 int ret, err;
2807 handle_t *handle;
2808
617ba13b
MC		 2809 handle = ext4_journal_start(dquot_to_inode(dquot),
2810 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 2811 if (IS_ERR(handle))
2812 return PTR_ERR(handle);
2813 ret = dquot_acquire(dquot);
617ba13b 2814 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2815 if (!ret)
2816 ret = err;
2817 return ret;
2818}
2819
617ba13b 2820static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 2821{
2822 int ret, err;
2823 handle_t *handle;
2824
617ba13b
MC		 2825 handle = ext4_journal_start(dquot_to_inode(dquot),
2826 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2827 if (IS_ERR(handle)) {
2828 /* Release dquot anyway to avoid endless cycle in dqput() */
2829 dquot_release(dquot);
ac27a0ec 2830 return PTR_ERR(handle);
9c3013e9 2831 }
ac27a0ec 2832 ret = dquot_release(dquot);
617ba13b 2833 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2834 if (!ret)
2835 ret = err;
2836 return ret;
2837}
2838
617ba13b 2839static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec
DK		 2840{
2841 /* Are we journalling quotas? */
617ba13b
MC		 2842 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2843 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 2844 dquot_mark_dquot_dirty(dquot);
617ba13b 2845 return ext4_write_dquot(dquot);
ac27a0ec
DK		 2846 } else {
2847 return dquot_mark_dquot_dirty(dquot);
2848 }
2849}
2850
617ba13b 2851static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 2852{
2853 int ret, err;
2854 handle_t *handle;
2855
2856 /* Data block + inode block */
617ba13b 2857 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 2858 if (IS_ERR(handle))
2859 return PTR_ERR(handle);
2860 ret = dquot_commit_info(sb, type);
617ba13b 2861 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2862 if (!ret)
2863 ret = err;
2864 return ret;
2865}
2866
2867/*
2868 * Turn on quotas during mount time - we need to find
2869 * the quota file and such...
2870 */
617ba13b 2871static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 2872{
617ba13b
MC		 2873 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2874 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 2875}
2876
2877/*
2878 * Standard function to be called on quota_on
2879 */
617ba13b 2880static int ext4_quota_on(struct super_block *sb, int type, int format_id,
ac27a0ec
DK		 2881 char *path)
2882{
2883 int err;
2884 struct nameidata nd;
2885
2886 if (!test_opt(sb, QUOTA))
2887 return -EINVAL;
2888 /* Not journalling quota? */
617ba13b
MC		 2889 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2890 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
ac27a0ec
DK		 2891 return vfs_quota_on(sb, type, format_id, path);
2892 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2893 if (err)
2894 return err;
2895 /* Quotafile not on the same filesystem? */
2896 if (nd.mnt->mnt_sb != sb) {
2897 path_release(&nd);
2898 return -EXDEV;
2899 }
2900 /* Quotafile not of fs root? */
2901 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2902 printk(KERN_WARNING
617ba13b 2903 "EXT4-fs: Quota file not on filesystem root. "
ac27a0ec
DK		 2904 "Journalled quota will not work.\n");
2905 path_release(&nd);
2906 return vfs_quota_on(sb, type, format_id, path);
2907}
2908
2909/* Read data from quotafile - avoid pagecache and such because we cannot afford
2910 * acquiring the locks... As quota files are never truncated and quota code
2911 * itself serializes the operations (and noone else should touch the files)
2912 * we don't have to be afraid of races */
617ba13b 2913static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 2914 size_t len, loff_t off)
2915{
2916 struct inode *inode = sb_dqopt(sb)->files[type];
617ba13b 2917 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 2918 int err = 0;
2919 int offset = off & (sb->s_blocksize - 1);
2920 int tocopy;
2921 size_t toread;
2922 struct buffer_head *bh;
2923 loff_t i_size = i_size_read(inode);
2924
2925 if (off > i_size)
2926 return 0;
2927 if (off+len > i_size)
2928 len = i_size-off;
2929 toread = len;
2930 while (toread > 0) {
2931 tocopy = sb->s_blocksize - offset < toread ?
2932 sb->s_blocksize - offset : toread;
617ba13b 2933 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 2934 if (err)
2935 return err;
2936 if (!bh) /* A hole? */
2937 memset(data, 0, tocopy);
2938 else
2939 memcpy(data, bh->b_data+offset, tocopy);
2940 brelse(bh);
2941 offset = 0;
2942 toread -= tocopy;
2943 data += tocopy;
2944 blk++;
2945 }
2946 return len;
2947}
2948
2949/* Write to quotafile (we know the transaction is already started and has
2950 * enough credits) */
617ba13b 2951static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 2952 const char *data, size_t len, loff_t off)
2953{
2954 struct inode *inode = sb_dqopt(sb)->files[type];
617ba13b 2955 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 2956 int err = 0;
2957 int offset = off & (sb->s_blocksize - 1);
2958 int tocopy;
617ba13b 2959 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 2960 size_t towrite = len;
2961 struct buffer_head *bh;
2962 handle_t *handle = journal_current_handle();
2963
9c3013e9
JK		 2964 if (!handle) {
2965 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2966 " cancelled because transaction is not started.\n",
2967 (unsigned long long)off, (unsigned long long)len);
2968 return -EIO;
2969 }
ac27a0ec
DK		 2970 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2971 while (towrite > 0) {
2972 tocopy = sb->s_blocksize - offset < towrite ?
2973 sb->s_blocksize - offset : towrite;
617ba13b 2974 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 2975 if (!bh)
2976 goto out;
2977 if (journal_quota) {
617ba13b 2978 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 2979 if (err) {
2980 brelse(bh);
2981 goto out;
2982 }
2983 }
2984 lock_buffer(bh);
2985 memcpy(bh->b_data+offset, data, tocopy);
2986 flush_dcache_page(bh->b_page);
2987 unlock_buffer(bh);
2988 if (journal_quota)
617ba13b 2989 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 2990 else {
2991 /* Always do at least ordered writes for quotas */
617ba13b 2992 err = ext4_journal_dirty_data(handle, bh);
ac27a0ec
DK		 2993 mark_buffer_dirty(bh);
2994 }
2995 brelse(bh);
2996 if (err)
2997 goto out;
2998 offset = 0;
2999 towrite -= tocopy;
3000 data += tocopy;
3001 blk++;
3002 }
3003out:
3004 if (len == towrite)
3005 return err;
3006 if (inode->i_size < off+len-towrite) {
3007 i_size_write(inode, off+len-towrite);
617ba13b 3008 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec
DK		 3009 }
3010 inode->i_version++;
3011 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3012 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3013 mutex_unlock(&inode->i_mutex);
3014 return len - towrite;
3015}
3016
3017#endif
3018
617ba13b 3019static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3020 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3021{
617ba13b 3022 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3023}
3024
617ba13b 3025static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3026 .owner = THIS_MODULE,
617ba13b
MC		 3027 .name = "ext4dev",
3028 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3029 .kill_sb = kill_block_super,
3030 .fs_flags = FS_REQUIRES_DEV,
3031};
3032
617ba13b 3033static int __init init_ext4_fs(void)
ac27a0ec 3034{
617ba13b 3035 int err = init_ext4_xattr();
ac27a0ec
DK		 3036 if (err)
3037 return err;
3038 err = init_inodecache();
3039 if (err)
3040 goto out1;
63f57933 3041 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3042 if (err)
3043 goto out;
3044 return 0;
3045out:
3046 destroy_inodecache();
3047out1:
617ba13b 3048 exit_ext4_xattr();
ac27a0ec
DK		 3049 return err;
3050}
3051
617ba13b 3052static void __exit exit_ext4_fs(void)
ac27a0ec 3053{
617ba13b 3054 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3055 destroy_inodecache();
617ba13b 3056 exit_ext4_xattr();
ac27a0ec
DK		 3057}
3058
3059MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3060MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3061MODULE_LICENSE("GPL");
617ba13b
MC		 3062module_init(init_ext4_fs)
3063module_exit(exit_ext4_fs)
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