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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
dab291af 23#include <linux/jbd2.h>
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
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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
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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
99e6f829
AK
376int ext4_update_compat_feature(handle_t *handle,
377 struct super_block *sb, __u32 compat)
378{
379 int err = 0;
380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
381 err = ext4_journal_get_write_access(handle,
382 EXT4_SB(sb)->s_sbh);
383 if (err)
384 return err;
385 EXT4_SET_COMPAT_FEATURE(sb, compat);
386 sb->s_dirt = 1;
387 handle->h_sync = 1;
388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
389 "call ext4_journal_dirty_met adata");
390 err = ext4_journal_dirty_metadata(handle,
391 EXT4_SB(sb)->s_sbh);
392 }
393 return err;
394}
395
396int ext4_update_rocompat_feature(handle_t *handle,
397 struct super_block *sb, __u32 rocompat)
398{
399 int err = 0;
400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
401 err = ext4_journal_get_write_access(handle,
402 EXT4_SB(sb)->s_sbh);
403 if (err)
404 return err;
405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
406 sb->s_dirt = 1;
407 handle->h_sync = 1;
408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
409 "call ext4_journal_dirty_met adata");
410 err = ext4_journal_dirty_metadata(handle,
411 EXT4_SB(sb)->s_sbh);
412 }
413 return err;
414}
415
416int ext4_update_incompat_feature(handle_t *handle,
417 struct super_block *sb, __u32 incompat)
418{
419 int err = 0;
420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
421 err = ext4_journal_get_write_access(handle,
422 EXT4_SB(sb)->s_sbh);
423 if (err)
424 return err;
425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
426 sb->s_dirt = 1;
427 handle->h_sync = 1;
428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
429 "call ext4_journal_dirty_met adata");
430 err = ext4_journal_dirty_metadata(handle,
431 EXT4_SB(sb)->s_sbh);
432 }
433 return err;
434}
435
ac27a0ec
DK
436/*
437 * Open the external journal device
438 */
617ba13b 439static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK
440{
441 struct block_device *bdev;
442 char b[BDEVNAME_SIZE];
443
444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
445 if (IS_ERR(bdev))
446 goto fail;
447 return bdev;
448
449fail:
617ba13b 450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK
451 __bdevname(dev, b), PTR_ERR(bdev));
452 return NULL;
453}
454
455/*
456 * Release the journal device
457 */
617ba13b 458static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK
459{
460 bd_release(bdev);
461 return blkdev_put(bdev);
462}
463
617ba13b 464static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK
465{
466 struct block_device *bdev;
467 int ret = -ENODEV;
468
469 bdev = sbi->journal_bdev;
470 if (bdev) {
617ba13b 471 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK
472 sbi->journal_bdev = NULL;
473 }
474 return ret;
475}
476
477static inline struct inode *orphan_list_entry(struct list_head *l)
478{
617ba13b 479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK
480}
481
617ba13b 482static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK
483{
484 struct list_head *l;
485
486 printk(KERN_ERR "sb orphan head is %d\n",
487 le32_to_cpu(sbi->s_es->s_last_orphan));
488
489 printk(KERN_ERR "sb_info orphan list:\n");
490 list_for_each(l, &sbi->s_orphan) {
491 struct inode *inode = orphan_list_entry(l);
492 printk(KERN_ERR " "
493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
494 inode->i_sb->s_id, inode->i_ino, inode,
495 inode->i_mode, inode->i_nlink,
496 NEXT_ORPHAN(inode));
497 }
498}
499
617ba13b 500static void ext4_put_super (struct super_block * sb)
ac27a0ec 501{
617ba13b
MC
502 struct ext4_sb_info *sbi = EXT4_SB(sb);
503 struct ext4_super_block *es = sbi->s_es;
ac27a0ec
DK
504 int i;
505
c9de560d 506 ext4_mb_release(sb);
a86c6181 507 ext4_ext_release(sb);
617ba13b 508 ext4_xattr_put_super(sb);
dab291af 509 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec 510 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 511 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK
512 es->s_state = cpu_to_le16(sbi->s_mount_state);
513 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
514 mark_buffer_dirty(sbi->s_sbh);
617ba13b 515 ext4_commit_super(sb, es, 1);
ac27a0ec
DK
516 }
517
518 for (i = 0; i < sbi->s_gdb_count; i++)
519 brelse(sbi->s_group_desc[i]);
520 kfree(sbi->s_group_desc);
521 percpu_counter_destroy(&sbi->s_freeblocks_counter);
522 percpu_counter_destroy(&sbi->s_freeinodes_counter);
523 percpu_counter_destroy(&sbi->s_dirs_counter);
524 brelse(sbi->s_sbh);
525#ifdef CONFIG_QUOTA
526 for (i = 0; i < MAXQUOTAS; i++)
527 kfree(sbi->s_qf_names[i]);
528#endif
529
530 /* Debugging code just in case the in-memory inode orphan list
531 * isn't empty. The on-disk one can be non-empty if we've
532 * detected an error and taken the fs readonly, but the
533 * in-memory list had better be clean by this point. */
534 if (!list_empty(&sbi->s_orphan))
535 dump_orphan_list(sb, sbi);
536 J_ASSERT(list_empty(&sbi->s_orphan));
537
f98393a6 538 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK
539 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
540 /*
541 * Invalidate the journal device's buffers. We don't want them
542 * floating about in memory - the physical journal device may
543 * hotswapped, and it breaks the `ro-after' testing code.
544 */
545 sync_blockdev(sbi->journal_bdev);
f98393a6 546 invalidate_bdev(sbi->journal_bdev);
617ba13b 547 ext4_blkdev_remove(sbi);
ac27a0ec
DK
548 }
549 sb->s_fs_info = NULL;
550 kfree(sbi);
551 return;
552}
553
e18b890b 554static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK
555
556/*
557 * Called inside transaction, so use GFP_NOFS
558 */
617ba13b 559static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 560{
617ba13b 561 struct ext4_inode_info *ei;
ac27a0ec 562
e6b4f8da 563 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK
564 if (!ei)
565 return NULL;
617ba13b
MC
566#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
567 ei->i_acl = EXT4_ACL_NOT_CACHED;
568 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK
569#endif
570 ei->i_block_alloc_info = NULL;
571 ei->vfs_inode.i_version = 1;
a86c6181 572 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT
573 INIT_LIST_HEAD(&ei->i_prealloc_list);
574 spin_lock_init(&ei->i_prealloc_lock);
ac27a0ec
DK
575 return &ei->vfs_inode;
576}
577
617ba13b 578static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 579{
9f7dd93d
VA
580 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
581 printk("EXT4 Inode %p: orphan list check failed!\n",
582 EXT4_I(inode));
583 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
584 EXT4_I(inode), sizeof(struct ext4_inode_info),
585 true);
586 dump_stack();
587 }
617ba13b 588 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK
589}
590
4ba9b9d0 591static void init_once(struct kmem_cache *cachep, void *foo)
ac27a0ec 592{
617ba13b 593 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 594
a35afb83 595 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 596#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 597 init_rwsem(&ei->xattr_sem);
ac27a0ec 598#endif
0e855ac8 599 init_rwsem(&ei->i_data_sem);
a35afb83 600 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK
601}
602
603static int init_inodecache(void)
604{
617ba13b
MC
605 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
606 sizeof(struct ext4_inode_info),
ac27a0ec
DK
607 0, (SLAB_RECLAIM_ACCOUNT|
608 SLAB_MEM_SPREAD),
20c2df83 609 init_once);
617ba13b 610 if (ext4_inode_cachep == NULL)
ac27a0ec
DK
611 return -ENOMEM;
612 return 0;
613}
614
615static void destroy_inodecache(void)
616{
617ba13b 617 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK
618}
619
617ba13b 620static void ext4_clear_inode(struct inode *inode)
ac27a0ec 621{
617ba13b
MC
622 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
623#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
624 if (EXT4_I(inode)->i_acl &&
625 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
626 posix_acl_release(EXT4_I(inode)->i_acl);
627 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
628 }
629 if (EXT4_I(inode)->i_default_acl &&
630 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
631 posix_acl_release(EXT4_I(inode)->i_default_acl);
632 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK
633 }
634#endif
617ba13b
MC
635 ext4_discard_reservation(inode);
636 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK
637 if (unlikely(rsv))
638 kfree(rsv);
639}
640
617ba13b 641static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
ac27a0ec
DK
642{
643#if defined(CONFIG_QUOTA)
617ba13b 644 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK
645
646 if (sbi->s_jquota_fmt)
647 seq_printf(seq, ",jqfmt=%s",
648 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
649
650 if (sbi->s_qf_names[USRQUOTA])
651 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
652
653 if (sbi->s_qf_names[GRPQUOTA])
654 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
655
617ba13b 656 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK
657 seq_puts(seq, ",usrquota");
658
617ba13b 659 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK
660 seq_puts(seq, ",grpquota");
661#endif
662}
663
d9c9bef1
MS
664/*
665 * Show an option if
666 * - it's set to a non-default value OR
667 * - if the per-sb default is different from the global default
668 */
617ba13b 669static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 670{
aa22df2c
AK
671 int def_errors;
672 unsigned long def_mount_opts;
ac27a0ec 673 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS
674 struct ext4_sb_info *sbi = EXT4_SB(sb);
675 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS
676
677 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 678 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS
679
680 if (sbi->s_sb_block != 1)
681 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
682 if (test_opt(sb, MINIX_DF))
683 seq_puts(seq, ",minixdf");
aa22df2c 684 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS
685 seq_puts(seq, ",grpid");
686 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
687 seq_puts(seq, ",nogrpid");
688 if (sbi->s_resuid != EXT4_DEF_RESUID ||
689 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
690 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
691 }
692 if (sbi->s_resgid != EXT4_DEF_RESGID ||
693 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
694 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
695 }
bb4f397a 696 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 697 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK
698 def_errors == EXT4_ERRORS_CONTINUE) {
699 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS
700 }
701 }
aa22df2c 702 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 703 seq_puts(seq, ",errors=continue");
aa22df2c 704 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 705 seq_puts(seq, ",errors=panic");
aa22df2c 706 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 707 seq_puts(seq, ",nouid32");
aa22df2c 708 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS
709 seq_puts(seq, ",debug");
710 if (test_opt(sb, OLDALLOC))
711 seq_puts(seq, ",oldalloc");
07620f69 712#ifdef CONFIG_EXT4DEV_FS_XATTR
aa22df2c
AK
713 if (test_opt(sb, XATTR_USER) &&
714 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS
715 seq_puts(seq, ",user_xattr");
716 if (!test_opt(sb, XATTR_USER) &&
717 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
718 seq_puts(seq, ",nouser_xattr");
719 }
720#endif
07620f69 721#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
aa22df2c 722 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS
723 seq_puts(seq, ",acl");
724 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
725 seq_puts(seq, ",noacl");
726#endif
727 if (!test_opt(sb, RESERVATION))
728 seq_puts(seq, ",noreservation");
729 if (sbi->s_commit_interval) {
730 seq_printf(seq, ",commit=%u",
731 (unsigned) (sbi->s_commit_interval / HZ));
732 }
733 if (test_opt(sb, BARRIER))
734 seq_puts(seq, ",barrier=1");
735 if (test_opt(sb, NOBH))
736 seq_puts(seq, ",nobh");
737 if (!test_opt(sb, EXTENTS))
738 seq_puts(seq, ",noextents");
3dbd0ede
AK
739 if (!test_opt(sb, MBALLOC))
740 seq_puts(seq, ",nomballoc");
25ec56b5
JNC
741 if (test_opt(sb, I_VERSION))
742 seq_puts(seq, ",i_version");
ac27a0ec 743
cb45bbe4
MS
744 if (sbi->s_stripe)
745 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK
746 /*
747 * journal mode get enabled in different ways
748 * So just print the value even if we didn't specify it
749 */
617ba13b 750 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 751 seq_puts(seq, ",data=journal");
617ba13b 752 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 753 seq_puts(seq, ",data=ordered");
617ba13b 754 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK
755 seq_puts(seq, ",data=writeback");
756
617ba13b 757 ext4_show_quota_options(seq, sb);
ac27a0ec
DK
758 return 0;
759}
760
761
1b961ac0
CH
762static struct inode *ext4_nfs_get_inode(struct super_block *sb,
763 u64 ino, u32 generation)
ac27a0ec 764{
ac27a0ec 765 struct inode *inode;
ac27a0ec 766
617ba13b 767 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 768 return ERR_PTR(-ESTALE);
617ba13b 769 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK
770 return ERR_PTR(-ESTALE);
771
772 /* iget isn't really right if the inode is currently unallocated!!
773 *
617ba13b 774 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK
775 * deleted, so we should be safe.
776 *
777 * Currently we don't know the generation for parent directory, so
778 * a generation of 0 means "accept any"
779 */
1d1fe1ee
DH
780 inode = ext4_iget(sb, ino);
781 if (IS_ERR(inode))
782 return ERR_CAST(inode);
783 if (generation && inode->i_generation != generation) {
ac27a0ec
DK
784 iput(inode);
785 return ERR_PTR(-ESTALE);
786 }
1b961ac0
CH
787
788 return inode;
789}
790
791static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
792 int fh_len, int fh_type)
793{
794 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
795 ext4_nfs_get_inode);
796}
797
798static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
799 int fh_len, int fh_type)
800{
801 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
802 ext4_nfs_get_inode);
ac27a0ec
DK
803}
804
805#ifdef CONFIG_QUOTA
806#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
807#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
808
617ba13b
MC
809static int ext4_dquot_initialize(struct inode *inode, int type);
810static int ext4_dquot_drop(struct inode *inode);
811static int ext4_write_dquot(struct dquot *dquot);
812static int ext4_acquire_dquot(struct dquot *dquot);
813static int ext4_release_dquot(struct dquot *dquot);
814static int ext4_mark_dquot_dirty(struct dquot *dquot);
815static int ext4_write_info(struct super_block *sb, int type);
816static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
817static int ext4_quota_on_mount(struct super_block *sb, int type);
818static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 819 size_t len, loff_t off);
617ba13b 820static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK
821 const char *data, size_t len, loff_t off);
822
617ba13b
MC
823static struct dquot_operations ext4_quota_operations = {
824 .initialize = ext4_dquot_initialize,
825 .drop = ext4_dquot_drop,
ac27a0ec
DK
826 .alloc_space = dquot_alloc_space,
827 .alloc_inode = dquot_alloc_inode,
828 .free_space = dquot_free_space,
829 .free_inode = dquot_free_inode,
830 .transfer = dquot_transfer,
617ba13b
MC
831 .write_dquot = ext4_write_dquot,
832 .acquire_dquot = ext4_acquire_dquot,
833 .release_dquot = ext4_release_dquot,
834 .mark_dirty = ext4_mark_dquot_dirty,
835 .write_info = ext4_write_info
ac27a0ec
DK
836};
837
617ba13b
MC
838static struct quotactl_ops ext4_qctl_operations = {
839 .quota_on = ext4_quota_on,
ac27a0ec
DK
840 .quota_off = vfs_quota_off,
841 .quota_sync = vfs_quota_sync,
842 .get_info = vfs_get_dqinfo,
843 .set_info = vfs_set_dqinfo,
844 .get_dqblk = vfs_get_dqblk,
845 .set_dqblk = vfs_set_dqblk
846};
847#endif
848
ee9b6d61 849static const struct super_operations ext4_sops = {
617ba13b
MC
850 .alloc_inode = ext4_alloc_inode,
851 .destroy_inode = ext4_destroy_inode,
617ba13b
MC
852 .write_inode = ext4_write_inode,
853 .dirty_inode = ext4_dirty_inode,
854 .delete_inode = ext4_delete_inode,
855 .put_super = ext4_put_super,
856 .write_super = ext4_write_super,
857 .sync_fs = ext4_sync_fs,
858 .write_super_lockfs = ext4_write_super_lockfs,
859 .unlockfs = ext4_unlockfs,
860 .statfs = ext4_statfs,
861 .remount_fs = ext4_remount,
862 .clear_inode = ext4_clear_inode,
863 .show_options = ext4_show_options,
ac27a0ec 864#ifdef CONFIG_QUOTA
617ba13b
MC
865 .quota_read = ext4_quota_read,
866 .quota_write = ext4_quota_write,
ac27a0ec
DK
867#endif
868};
869
39655164 870static const struct export_operations ext4_export_ops = {
1b961ac0
CH
871 .fh_to_dentry = ext4_fh_to_dentry,
872 .fh_to_parent = ext4_fh_to_parent,
617ba13b 873 .get_parent = ext4_get_parent,
ac27a0ec
DK
874};
875
876enum {
877 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
878 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
879 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
880 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
881 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
882 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 883 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK
884 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
885 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
886 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
887 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 888 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
c9de560d 889 Opt_mballoc, Opt_nomballoc, Opt_stripe,
ac27a0ec
DK
890};
891
892static match_table_t tokens = {
893 {Opt_bsd_df, "bsddf"},
894 {Opt_minix_df, "minixdf"},
895 {Opt_grpid, "grpid"},
896 {Opt_grpid, "bsdgroups"},
897 {Opt_nogrpid, "nogrpid"},
898 {Opt_nogrpid, "sysvgroups"},
899 {Opt_resgid, "resgid=%u"},
900 {Opt_resuid, "resuid=%u"},
901 {Opt_sb, "sb=%u"},
902 {Opt_err_cont, "errors=continue"},
903 {Opt_err_panic, "errors=panic"},
904 {Opt_err_ro, "errors=remount-ro"},
905 {Opt_nouid32, "nouid32"},
906 {Opt_nocheck, "nocheck"},
907 {Opt_nocheck, "check=none"},
908 {Opt_debug, "debug"},
909 {Opt_oldalloc, "oldalloc"},
910 {Opt_orlov, "orlov"},
911 {Opt_user_xattr, "user_xattr"},
912 {Opt_nouser_xattr, "nouser_xattr"},
913 {Opt_acl, "acl"},
914 {Opt_noacl, "noacl"},
915 {Opt_reservation, "reservation"},
916 {Opt_noreservation, "noreservation"},
917 {Opt_noload, "noload"},
918 {Opt_nobh, "nobh"},
919 {Opt_bh, "bh"},
920 {Opt_commit, "commit=%u"},
921 {Opt_journal_update, "journal=update"},
922 {Opt_journal_inum, "journal=%u"},
923 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS
924 {Opt_journal_checksum, "journal_checksum"},
925 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK
926 {Opt_abort, "abort"},
927 {Opt_data_journal, "data=journal"},
928 {Opt_data_ordered, "data=ordered"},
929 {Opt_data_writeback, "data=writeback"},
930 {Opt_offusrjquota, "usrjquota="},
931 {Opt_usrjquota, "usrjquota=%s"},
932 {Opt_offgrpjquota, "grpjquota="},
933 {Opt_grpjquota, "grpjquota=%s"},
934 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
935 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
936 {Opt_grpquota, "grpquota"},
937 {Opt_noquota, "noquota"},
938 {Opt_quota, "quota"},
939 {Opt_usrquota, "usrquota"},
940 {Opt_barrier, "barrier=%u"},
a86c6181 941 {Opt_extents, "extents"},
1e2462f9 942 {Opt_noextents, "noextents"},
25ec56b5 943 {Opt_i_version, "i_version"},
c9de560d
AT
944 {Opt_mballoc, "mballoc"},
945 {Opt_nomballoc, "nomballoc"},
946 {Opt_stripe, "stripe=%u"},
ac27a0ec
DK
947 {Opt_err, NULL},
948 {Opt_resize, "resize"},
949};
950
617ba13b 951static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 952{
617ba13b 953 ext4_fsblk_t sb_block;
ac27a0ec
DK
954 char *options = (char *) *data;
955
956 if (!options || strncmp(options, "sb=", 3) != 0)
957 return 1; /* Default location */
958 options += 3;
617ba13b 959 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK
960 sb_block = simple_strtoul(options, &options, 0);
961 if (*options && *options != ',') {
617ba13b 962 printk("EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK
963 (char *) *data);
964 return 1;
965 }
966 if (*options == ',')
967 options++;
968 *data = (void *) options;
969 return sb_block;
970}
971
972static int parse_options (char *options, struct super_block *sb,
973 unsigned int *inum, unsigned long *journal_devnum,
617ba13b 974 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 975{
617ba13b 976 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK
977 char * p;
978 substring_t args[MAX_OPT_ARGS];
979 int data_opt = 0;
980 int option;
981#ifdef CONFIG_QUOTA
982 int qtype;
983 char *qname;
984#endif
985
986 if (!options)
987 return 1;
988
989 while ((p = strsep (&options, ",")) != NULL) {
990 int token;
991 if (!*p)
992 continue;
993
994 token = match_token(p, tokens, args);
995 switch (token) {
996 case Opt_bsd_df:
997 clear_opt (sbi->s_mount_opt, MINIX_DF);
998 break;
999 case Opt_minix_df:
1000 set_opt (sbi->s_mount_opt, MINIX_DF);
1001 break;
1002 case Opt_grpid:
1003 set_opt (sbi->s_mount_opt, GRPID);
1004 break;
1005 case Opt_nogrpid:
1006 clear_opt (sbi->s_mount_opt, GRPID);
1007 break;
1008 case Opt_resuid:
1009 if (match_int(&args[0], &option))
1010 return 0;
1011 sbi->s_resuid = option;
1012 break;
1013 case Opt_resgid:
1014 if (match_int(&args[0], &option))
1015 return 0;
1016 sbi->s_resgid = option;
1017 break;
1018 case Opt_sb:
1019 /* handled by get_sb_block() instead of here */
1020 /* *sb_block = match_int(&args[0]); */
1021 break;
1022 case Opt_err_panic:
1023 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1024 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1025 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1026 break;
1027 case Opt_err_ro:
1028 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1029 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1030 set_opt (sbi->s_mount_opt, ERRORS_RO);
1031 break;
1032 case Opt_err_cont:
1033 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1034 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1035 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1036 break;
1037 case Opt_nouid32:
1038 set_opt (sbi->s_mount_opt, NO_UID32);
1039 break;
1040 case Opt_nocheck:
1041 clear_opt (sbi->s_mount_opt, CHECK);
1042 break;
1043 case Opt_debug:
1044 set_opt (sbi->s_mount_opt, DEBUG);
1045 break;
1046 case Opt_oldalloc:
1047 set_opt (sbi->s_mount_opt, OLDALLOC);
1048 break;
1049 case Opt_orlov:
1050 clear_opt (sbi->s_mount_opt, OLDALLOC);
1051 break;
617ba13b 1052#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec
DK
1053 case Opt_user_xattr:
1054 set_opt (sbi->s_mount_opt, XATTR_USER);
1055 break;
1056 case Opt_nouser_xattr:
1057 clear_opt (sbi->s_mount_opt, XATTR_USER);
1058 break;
1059#else
1060 case Opt_user_xattr:
1061 case Opt_nouser_xattr:
617ba13b 1062 printk("EXT4 (no)user_xattr options not supported\n");
ac27a0ec
DK
1063 break;
1064#endif
617ba13b 1065#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK
1066 case Opt_acl:
1067 set_opt(sbi->s_mount_opt, POSIX_ACL);
1068 break;
1069 case Opt_noacl:
1070 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1071 break;
1072#else
1073 case Opt_acl:
1074 case Opt_noacl:
617ba13b 1075 printk("EXT4 (no)acl options not supported\n");
ac27a0ec
DK
1076 break;
1077#endif
1078 case Opt_reservation:
1079 set_opt(sbi->s_mount_opt, RESERVATION);
1080 break;
1081 case Opt_noreservation:
1082 clear_opt(sbi->s_mount_opt, RESERVATION);
1083 break;
1084 case Opt_journal_update:
1085 /* @@@ FIXME */
1086 /* Eventually we will want to be able to create
1087 a journal file here. For now, only allow the
1088 user to specify an existing inode to be the
1089 journal file. */
1090 if (is_remount) {
617ba13b 1091 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK
1092 "journal on remount\n");
1093 return 0;
1094 }
1095 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1096 break;
1097 case Opt_journal_inum:
1098 if (is_remount) {
617ba13b 1099 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK
1100 "journal on remount\n");
1101 return 0;
1102 }
1103 if (match_int(&args[0], &option))
1104 return 0;
1105 *inum = option;
1106 break;
1107 case Opt_journal_dev:
1108 if (is_remount) {
617ba13b 1109 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK
1110 "journal on remount\n");
1111 return 0;
1112 }
1113 if (match_int(&args[0], &option))
1114 return 0;
1115 *journal_devnum = option;
1116 break;
818d276c
GS
1117 case Opt_journal_checksum:
1118 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1119 break;
1120 case Opt_journal_async_commit:
1121 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1122 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1123 break;
ac27a0ec
DK
1124 case Opt_noload:
1125 set_opt (sbi->s_mount_opt, NOLOAD);
1126 break;
1127 case Opt_commit:
1128 if (match_int(&args[0], &option))
1129 return 0;
1130 if (option < 0)
1131 return 0;
1132 if (option == 0)
cd02ff0b 1133 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK
1134 sbi->s_commit_interval = HZ * option;
1135 break;
1136 case Opt_data_journal:
617ba13b 1137 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK
1138 goto datacheck;
1139 case Opt_data_ordered:
617ba13b 1140 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK
1141 goto datacheck;
1142 case Opt_data_writeback:
617ba13b 1143 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK
1144 datacheck:
1145 if (is_remount) {
617ba13b 1146 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK
1147 != data_opt) {
1148 printk(KERN_ERR
617ba13b 1149 "EXT4-fs: cannot change data "
ac27a0ec
DK
1150 "mode on remount\n");
1151 return 0;
1152 }
1153 } else {
617ba13b 1154 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK
1155 sbi->s_mount_opt |= data_opt;
1156 }
1157 break;
1158#ifdef CONFIG_QUOTA
1159 case Opt_usrjquota:
1160 qtype = USRQUOTA;
1161 goto set_qf_name;
1162 case Opt_grpjquota:
1163 qtype = GRPQUOTA;
1164set_qf_name:
1165 if (sb_any_quota_enabled(sb)) {
1166 printk(KERN_ERR
617ba13b 1167 "EXT4-fs: Cannot change journalled "
ac27a0ec
DK
1168 "quota options when quota turned on.\n");
1169 return 0;
1170 }
1171 qname = match_strdup(&args[0]);
1172 if (!qname) {
1173 printk(KERN_ERR
617ba13b 1174 "EXT4-fs: not enough memory for "
ac27a0ec
DK
1175 "storing quotafile name.\n");
1176 return 0;
1177 }
1178 if (sbi->s_qf_names[qtype] &&
1179 strcmp(sbi->s_qf_names[qtype], qname)) {
1180 printk(KERN_ERR
617ba13b 1181 "EXT4-fs: %s quota file already "
ac27a0ec
DK
1182 "specified.\n", QTYPE2NAME(qtype));
1183 kfree(qname);
1184 return 0;
1185 }
1186 sbi->s_qf_names[qtype] = qname;
1187 if (strchr(sbi->s_qf_names[qtype], '/')) {
1188 printk(KERN_ERR
617ba13b 1189 "EXT4-fs: quotafile must be on "
ac27a0ec
DK
1190 "filesystem root.\n");
1191 kfree(sbi->s_qf_names[qtype]);
1192 sbi->s_qf_names[qtype] = NULL;
1193 return 0;
1194 }
1195 set_opt(sbi->s_mount_opt, QUOTA);
1196 break;
1197 case Opt_offusrjquota:
1198 qtype = USRQUOTA;
1199 goto clear_qf_name;
1200 case Opt_offgrpjquota:
1201 qtype = GRPQUOTA;
1202clear_qf_name:
1203 if (sb_any_quota_enabled(sb)) {
617ba13b 1204 printk(KERN_ERR "EXT4-fs: Cannot change "
ac27a0ec
DK
1205 "journalled quota options when "
1206 "quota turned on.\n");
1207 return 0;
1208 }
1209 /*
1210 * The space will be released later when all options
1211 * are confirmed to be correct
1212 */
1213 sbi->s_qf_names[qtype] = NULL;
1214 break;
1215 case Opt_jqfmt_vfsold:
1216 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1217 break;
1218 case Opt_jqfmt_vfsv0:
1219 sbi->s_jquota_fmt = QFMT_VFS_V0;
1220 break;
1221 case Opt_quota:
1222 case Opt_usrquota:
1223 set_opt(sbi->s_mount_opt, QUOTA);
1224 set_opt(sbi->s_mount_opt, USRQUOTA);
1225 break;
1226 case Opt_grpquota:
1227 set_opt(sbi->s_mount_opt, QUOTA);
1228 set_opt(sbi->s_mount_opt, GRPQUOTA);
1229 break;
1230 case Opt_noquota:
1231 if (sb_any_quota_enabled(sb)) {
617ba13b 1232 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK
1233 "options when quota turned on.\n");
1234 return 0;
1235 }
1236 clear_opt(sbi->s_mount_opt, QUOTA);
1237 clear_opt(sbi->s_mount_opt, USRQUOTA);
1238 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1239 break;
1240#else
1241 case Opt_quota:
1242 case Opt_usrquota:
1243 case Opt_grpquota:
1244 case Opt_usrjquota:
1245 case Opt_grpjquota:
1246 case Opt_offusrjquota:
1247 case Opt_offgrpjquota:
1248 case Opt_jqfmt_vfsold:
1249 case Opt_jqfmt_vfsv0:
1250 printk(KERN_ERR
617ba13b 1251 "EXT4-fs: journalled quota options not "
ac27a0ec
DK
1252 "supported.\n");
1253 break;
1254 case Opt_noquota:
1255 break;
1256#endif
1257 case Opt_abort:
1258 set_opt(sbi->s_mount_opt, ABORT);
1259 break;
1260 case Opt_barrier:
1261 if (match_int(&args[0], &option))
1262 return 0;
1263 if (option)
1264 set_opt(sbi->s_mount_opt, BARRIER);
1265 else
1266 clear_opt(sbi->s_mount_opt, BARRIER);
1267 break;
1268 case Opt_ignore:
1269 break;
1270 case Opt_resize:
1271 if (!is_remount) {
617ba13b 1272 printk("EXT4-fs: resize option only available "
ac27a0ec
DK
1273 "for remount\n");
1274 return 0;
1275 }
1276 if (match_int(&args[0], &option) != 0)
1277 return 0;
1278 *n_blocks_count = option;
1279 break;
1280 case Opt_nobh:
1281 set_opt(sbi->s_mount_opt, NOBH);
1282 break;
1283 case Opt_bh:
1284 clear_opt(sbi->s_mount_opt, NOBH);
1285 break;
a86c6181
AT
1286 case Opt_extents:
1287 set_opt (sbi->s_mount_opt, EXTENTS);
1288 break;
1e2462f9
MC
1289 case Opt_noextents:
1290 clear_opt (sbi->s_mount_opt, EXTENTS);
1291 break;
25ec56b5
JNC
1292 case Opt_i_version:
1293 set_opt(sbi->s_mount_opt, I_VERSION);
1294 sb->s_flags |= MS_I_VERSION;
1295 break;
c9de560d
AT
1296 case Opt_mballoc:
1297 set_opt(sbi->s_mount_opt, MBALLOC);
1298 break;
1299 case Opt_nomballoc:
1300 clear_opt(sbi->s_mount_opt, MBALLOC);
1301 break;
1302 case Opt_stripe:
1303 if (match_int(&args[0], &option))
1304 return 0;
1305 if (option < 0)
1306 return 0;
1307 sbi->s_stripe = option;
1308 break;
ac27a0ec
DK
1309 default:
1310 printk (KERN_ERR
617ba13b 1311 "EXT4-fs: Unrecognized mount option \"%s\" "
ac27a0ec
DK
1312 "or missing value\n", p);
1313 return 0;
1314 }
1315 }
1316#ifdef CONFIG_QUOTA
1317 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1318 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK
1319 sbi->s_qf_names[USRQUOTA])
1320 clear_opt(sbi->s_mount_opt, USRQUOTA);
1321
617ba13b 1322 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK
1323 sbi->s_qf_names[GRPQUOTA])
1324 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1325
1326 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1327 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1328 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC
1329 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1330 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK
1331 "format mixing.\n");
1332 return 0;
1333 }
1334
1335 if (!sbi->s_jquota_fmt) {
617ba13b 1336 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK
1337 "not specified.\n");
1338 return 0;
1339 }
1340 } else {
1341 if (sbi->s_jquota_fmt) {
617ba13b 1342 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK
1343 "specified with no journalling "
1344 "enabled.\n");
1345 return 0;
1346 }
1347 }
1348#endif
1349 return 1;
1350}
1351
617ba13b 1352static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK
1353 int read_only)
1354{
617ba13b 1355 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK
1356 int res = 0;
1357
617ba13b
MC
1358 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1359 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
ac27a0ec
DK
1360 "forcing read-only mode\n");
1361 res = MS_RDONLY;
1362 }
1363 if (read_only)
1364 return res;
617ba13b
MC
1365 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1366 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
ac27a0ec 1367 "running e2fsck is recommended\n");
617ba13b 1368 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
ac27a0ec 1369 printk (KERN_WARNING
617ba13b 1370 "EXT4-fs warning: mounting fs with errors, "
ac27a0ec
DK
1371 "running e2fsck is recommended\n");
1372 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1373 le16_to_cpu(es->s_mnt_count) >=
1374 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1375 printk (KERN_WARNING
617ba13b 1376 "EXT4-fs warning: maximal mount count reached, "
ac27a0ec
DK
1377 "running e2fsck is recommended\n");
1378 else if (le32_to_cpu(es->s_checkinterval) &&
1379 (le32_to_cpu(es->s_lastcheck) +
1380 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1381 printk (KERN_WARNING
617ba13b 1382 "EXT4-fs warning: checktime reached, "
ac27a0ec
DK
1383 "running e2fsck is recommended\n");
1384#if 0
1385 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM
1386 * inconsistencies, to force a fsck at reboot. But for
1387 * a plain journaled filesystem we can keep it set as
1388 * valid forever! :)
1389 */
617ba13b 1390 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
ac27a0ec
DK
1391#endif
1392 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1393 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
ac27a0ec
DK
1394 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1395 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC
1396 ext4_update_dynamic_rev(sb);
1397 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1398
617ba13b 1399 ext4_commit_super(sb, es, 1);
ac27a0ec 1400 if (test_opt(sb, DEBUG))
617ba13b 1401 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK
1402 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1403 sb->s_blocksize,
1404 sbi->s_groups_count,
617ba13b
MC
1405 EXT4_BLOCKS_PER_GROUP(sb),
1406 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK
1407 sbi->s_mount_opt);
1408
617ba13b
MC
1409 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1410 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK
1411 char b[BDEVNAME_SIZE];
1412
1413 printk("external journal on %s\n",
617ba13b 1414 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec
DK
1415 } else {
1416 printk("internal journal\n");
1417 }
1418 return res;
1419}
1420
717d50e4
AD
1421__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1422 struct ext4_group_desc *gdp)
1423{
1424 __u16 crc = 0;
1425
1426 if (sbi->s_es->s_feature_ro_compat &
1427 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1428 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1429 __le32 le_group = cpu_to_le32(block_group);
1430
1431 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1432 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1433 crc = crc16(crc, (__u8 *)gdp, offset);
1434 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1435 /* for checksum of struct ext4_group_desc do the rest...*/
1436 if ((sbi->s_es->s_feature_incompat &
1437 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1438 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1439 crc = crc16(crc, (__u8 *)gdp + offset,
1440 le16_to_cpu(sbi->s_es->s_desc_size) -
1441 offset);
1442 }
1443
1444 return cpu_to_le16(crc);
1445}
1446
1447int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1448 struct ext4_group_desc *gdp)
1449{
1450 if ((sbi->s_es->s_feature_ro_compat &
1451 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1452 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1453 return 0;
1454
1455 return 1;
1456}
1457
ac27a0ec 1458/* Called at mount-time, super-block is locked */
197cd65a 1459static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1460{
617ba13b
MC
1461 struct ext4_sb_info *sbi = EXT4_SB(sb);
1462 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1463 ext4_fsblk_t last_block;
bd81d8ee
LV
1464 ext4_fsblk_t block_bitmap;
1465 ext4_fsblk_t inode_bitmap;
1466 ext4_fsblk_t inode_table;
ce421581 1467 int flexbg_flag = 0;
fd2d4291 1468 ext4_group_t i;
ac27a0ec 1469
ce421581
JS
1470 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1471 flexbg_flag = 1;
1472
617ba13b 1473 ext4_debug ("Checking group descriptors");
ac27a0ec 1474
197cd65a
AM
1475 for (i = 0; i < sbi->s_groups_count; i++) {
1476 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1477
ce421581 1478 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1479 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK
1480 else
1481 last_block = first_block +
617ba13b 1482 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1483
8fadc143 1484 block_bitmap = ext4_block_bitmap(sb, gdp);
bd81d8ee 1485 if (block_bitmap < first_block || block_bitmap > last_block)
ac27a0ec 1486 {
617ba13b 1487 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1488 "Block bitmap for group %lu"
2ae02107 1489 " not in group (block %llu)!",
bd81d8ee 1490 i, block_bitmap);
ac27a0ec
DK
1491 return 0;
1492 }
8fadc143 1493 inode_bitmap = ext4_inode_bitmap(sb, gdp);
bd81d8ee 1494 if (inode_bitmap < first_block || inode_bitmap > last_block)
ac27a0ec 1495 {
617ba13b 1496 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1497 "Inode bitmap for group %lu"
2ae02107 1498 " not in group (block %llu)!",
bd81d8ee 1499 i, inode_bitmap);
ac27a0ec
DK
1500 return 0;
1501 }
8fadc143 1502 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1503 if (inode_table < first_block ||
780dcdb2 1504 inode_table + sbi->s_itb_per_group - 1 > last_block)
ac27a0ec 1505 {
617ba13b 1506 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1507 "Inode table for group %lu"
2ae02107 1508 " not in group (block %llu)!",
bd81d8ee 1509 i, inode_table);
ac27a0ec
DK
1510 return 0;
1511 }
717d50e4
AD
1512 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1513 ext4_error(sb, __FUNCTION__,
fd2d4291
AM
1514 "Checksum for group %lu failed (%u!=%u)\n",
1515 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1516 gdp)), le16_to_cpu(gdp->bg_checksum));
717d50e4
AD
1517 return 0;
1518 }
ce421581
JS
1519 if (!flexbg_flag)
1520 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK
1521 }
1522
bd81d8ee 1523 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
617ba13b 1524 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK
1525 return 1;
1526}
1527
617ba13b 1528/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK
1529 * the superblock) which were deleted from all directories, but held open by
1530 * a process at the time of a crash. We walk the list and try to delete these
1531 * inodes at recovery time (only with a read-write filesystem).
1532 *
1533 * In order to keep the orphan inode chain consistent during traversal (in
1534 * case of crash during recovery), we link each inode into the superblock
1535 * orphan list_head and handle it the same way as an inode deletion during
1536 * normal operation (which journals the operations for us).
1537 *
1538 * We only do an iget() and an iput() on each inode, which is very safe if we
1539 * accidentally point at an in-use or already deleted inode. The worst that
1540 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1541 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK
1542 * e2fsck was run on this filesystem, and it must have already done the orphan
1543 * inode cleanup for us, so we can safely abort without any further action.
1544 */
617ba13b
MC
1545static void ext4_orphan_cleanup (struct super_block * sb,
1546 struct ext4_super_block * es)
ac27a0ec
DK
1547{
1548 unsigned int s_flags = sb->s_flags;
1549 int nr_orphans = 0, nr_truncates = 0;
1550#ifdef CONFIG_QUOTA
1551 int i;
1552#endif
1553 if (!es->s_last_orphan) {
1554 jbd_debug(4, "no orphan inodes to clean up\n");
1555 return;
1556 }
1557
a8f48a95
ES
1558 if (bdev_read_only(sb->s_bdev)) {
1559 printk(KERN_ERR "EXT4-fs: write access "
1560 "unavailable, skipping orphan cleanup.\n");
1561 return;
1562 }
1563
617ba13b 1564 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK
1565 if (es->s_last_orphan)
1566 jbd_debug(1, "Errors on filesystem, "
1567 "clearing orphan list.\n");
1568 es->s_last_orphan = 0;
1569 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1570 return;
1571 }
1572
1573 if (s_flags & MS_RDONLY) {
617ba13b 1574 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK
1575 sb->s_id);
1576 sb->s_flags &= ~MS_RDONLY;
1577 }
1578#ifdef CONFIG_QUOTA
1579 /* Needed for iput() to work correctly and not trash data */
1580 sb->s_flags |= MS_ACTIVE;
1581 /* Turn on quotas so that they are updated correctly */
1582 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC
1583 if (EXT4_SB(sb)->s_qf_names[i]) {
1584 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK
1585 if (ret < 0)
1586 printk(KERN_ERR
617ba13b 1587 "EXT4-fs: Cannot turn on journalled "
ac27a0ec
DK
1588 "quota: error %d\n", ret);
1589 }
1590 }
1591#endif
1592
1593 while (es->s_last_orphan) {
1594 struct inode *inode;
1595
1596 if (!(inode =
617ba13b 1597 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
ac27a0ec
DK
1598 es->s_last_orphan = 0;
1599 break;
1600 }
1601
617ba13b 1602 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK
1603 DQUOT_INIT(inode);
1604 if (inode->i_nlink) {
1605 printk(KERN_DEBUG
1606 "%s: truncating inode %lu to %Ld bytes\n",
1607 __FUNCTION__, inode->i_ino, inode->i_size);
1608 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1609 inode->i_ino, inode->i_size);
617ba13b 1610 ext4_truncate(inode);
ac27a0ec
DK
1611 nr_truncates++;
1612 } else {
1613 printk(KERN_DEBUG
1614 "%s: deleting unreferenced inode %lu\n",
1615 __FUNCTION__, inode->i_ino);
1616 jbd_debug(2, "deleting unreferenced inode %lu\n",
1617 inode->i_ino);
1618 nr_orphans++;
1619 }
1620 iput(inode); /* The delete magic happens here! */
1621 }
1622
1623#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1624
1625 if (nr_orphans)
617ba13b 1626 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK
1627 sb->s_id, PLURAL(nr_orphans));
1628 if (nr_truncates)
617ba13b 1629 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK
1630 sb->s_id, PLURAL(nr_truncates));
1631#ifdef CONFIG_QUOTA
1632 /* Turn quotas off */
1633 for (i = 0; i < MAXQUOTAS; i++) {
1634 if (sb_dqopt(sb)->files[i])
1635 vfs_quota_off(sb, i);
1636 }
1637#endif
1638 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1639}
cd2291a4
ES
1640/*
1641 * Maximal extent format file size.
1642 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1643 * extent format containers, within a sector_t, and within i_blocks
1644 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1645 * so that won't be a limiting factor.
1646 *
1647 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1648 */
1649static loff_t ext4_max_size(int blkbits)
1650{
1651 loff_t res;
1652 loff_t upper_limit = MAX_LFS_FILESIZE;
1653
1654 /* small i_blocks in vfs inode? */
1655 if (sizeof(blkcnt_t) < sizeof(u64)) {
1656 /*
1657 * CONFIG_LSF is not enabled implies the inode
1658 * i_block represent total blocks in 512 bytes
1659 * 32 == size of vfs inode i_blocks * 8
1660 */
1661 upper_limit = (1LL << 32) - 1;
1662
1663 /* total blocks in file system block size */
1664 upper_limit >>= (blkbits - 9);
1665 upper_limit <<= blkbits;
1666 }
1667
1668 /* 32-bit extent-start container, ee_block */
1669 res = 1LL << 32;
1670 res <<= blkbits;
1671 res -= 1;
1672
1673 /* Sanity check against vm- & vfs- imposed limits */
1674 if (res > upper_limit)
1675 res = upper_limit;
1676
1677 return res;
1678}
ac27a0ec 1679
ac27a0ec 1680/*
cd2291a4 1681 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK
1682 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1683 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1684 */
cd2291a4 1685static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1686{
617ba13b 1687 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK
1688 int meta_blocks;
1689 loff_t upper_limit;
1690 /* This is calculated to be the largest file size for a
cd2291a4 1691 * dense, bitmapped file such that the total number of
ac27a0ec 1692 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK
1693 * does not exceed 2^48 -1
1694 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1695 * total number of 512 bytes blocks of the file
1696 */
1697
1698 if (sizeof(blkcnt_t) < sizeof(u64)) {
1699 /*
1700 * CONFIG_LSF is not enabled implies the inode
1701 * i_block represent total blocks in 512 bytes
1702 * 32 == size of vfs inode i_blocks * 8
1703 */
1704 upper_limit = (1LL << 32) - 1;
1705
1706 /* total blocks in file system block size */
1707 upper_limit >>= (bits - 9);
1708
1709 } else {
8180a562
AK
1710 /*
1711 * We use 48 bit ext4_inode i_blocks
1712 * With EXT4_HUGE_FILE_FL set the i_blocks
1713 * represent total number of blocks in
1714 * file system block size
1715 */
0fc1b451
AK
1716 upper_limit = (1LL << 48) - 1;
1717
0fc1b451
AK
1718 }
1719
1720 /* indirect blocks */
1721 meta_blocks = 1;
1722 /* double indirect blocks */
1723 meta_blocks += 1 + (1LL << (bits-2));
1724 /* tripple indirect blocks */
1725 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1726
1727 upper_limit -= meta_blocks;
1728 upper_limit <<= bits;
ac27a0ec
DK
1729
1730 res += 1LL << (bits-2);
1731 res += 1LL << (2*(bits-2));
1732 res += 1LL << (3*(bits-2));
1733 res <<= bits;
1734 if (res > upper_limit)
1735 res = upper_limit;
0fc1b451
AK
1736
1737 if (res > MAX_LFS_FILESIZE)
1738 res = MAX_LFS_FILESIZE;
1739
ac27a0ec
DK
1740 return res;
1741}
1742
617ba13b 1743static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1744 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1745{
617ba13b 1746 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1747 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK
1748 int has_super = 0;
1749
1750 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1751
617ba13b 1752 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1753 nr < first_meta_bg)
70bbb3e0 1754 return logical_sb_block + nr + 1;
ac27a0ec 1755 bg = sbi->s_desc_per_block * nr;
617ba13b 1756 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1757 has_super = 1;
617ba13b 1758 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK
1759}
1760
c9de560d
AT
1761/**
1762 * ext4_get_stripe_size: Get the stripe size.
1763 * @sbi: In memory super block info
1764 *
1765 * If we have specified it via mount option, then
1766 * use the mount option value. If the value specified at mount time is
1767 * greater than the blocks per group use the super block value.
1768 * If the super block value is greater than blocks per group return 0.
1769 * Allocator needs it be less than blocks per group.
1770 *
1771 */
1772static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1773{
1774 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1775 unsigned long stripe_width =
1776 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1777
1778 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1779 return sbi->s_stripe;
1780
1781 if (stripe_width <= sbi->s_blocks_per_group)
1782 return stripe_width;
1783
1784 if (stride <= sbi->s_blocks_per_group)
1785 return stride;
1786
1787 return 0;
1788}
ac27a0ec 1789
617ba13b 1790static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1d03ec98
AK
1791 __releases(kernel_sem)
1792 __acquires(kernel_sem)
1793
ac27a0ec
DK
1794{
1795 struct buffer_head * bh;
617ba13b
MC
1796 struct ext4_super_block *es = NULL;
1797 struct ext4_sb_info *sbi;
1798 ext4_fsblk_t block;
1799 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1800 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK
1801 unsigned long offset = 0;
1802 unsigned int journal_inum = 0;
1803 unsigned long journal_devnum = 0;
1804 unsigned long def_mount_opts;
1805 struct inode *root;
1d1fe1ee 1806 int ret = -EINVAL;
ac27a0ec 1807 int blocksize;
ac27a0ec
DK
1808 int db_count;
1809 int i;
1810 int needs_recovery;
1811 __le32 features;
bd81d8ee 1812 __u64 blocks_count;
833f4077 1813 int err;
ac27a0ec
DK
1814
1815 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1816 if (!sbi)
1817 return -ENOMEM;
1818 sb->s_fs_info = sbi;
1819 sbi->s_mount_opt = 0;
617ba13b
MC
1820 sbi->s_resuid = EXT4_DEF_RESUID;
1821 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1822 sbi->s_sb_block = sb_block;
ac27a0ec
DK
1823
1824 unlock_kernel();
1825
617ba13b 1826 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1827 if (!blocksize) {
617ba13b 1828 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK
1829 goto out_fail;
1830 }
1831
afc7cbca
TS
1832 if (!sb_set_blocksize(sb, blocksize)) {
1833 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1834 goto out_fail;
1835 }
1836
ac27a0ec 1837 /*
617ba13b 1838 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK
1839 * block sizes. We need to calculate the offset from buffer start.
1840 */
617ba13b 1841 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM
1842 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1843 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1844 } else {
70bbb3e0 1845 logical_sb_block = sb_block;
ac27a0ec
DK
1846 }
1847
70bbb3e0 1848 if (!(bh = sb_bread(sb, logical_sb_block))) {
617ba13b 1849 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK
1850 goto out_fail;
1851 }
1852 /*
1853 * Note: s_es must be initialized as soon as possible because
617ba13b 1854 * some ext4 macro-instructions depend on its value
ac27a0ec 1855 */
617ba13b 1856 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK
1857 sbi->s_es = es;
1858 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC
1859 if (sb->s_magic != EXT4_SUPER_MAGIC)
1860 goto cantfind_ext4;
ac27a0ec
DK
1861
1862 /* Set defaults before we parse the mount options */
1863 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1864 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1865 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1866 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1867 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1868 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1869 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1870#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1871 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1872 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD
1873#endif
1874#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1875 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1876 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1877#endif
617ba13b
MC
1878 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1879 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1880 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1881 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1882 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1883 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1884
1885 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1886 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1887 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1888 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK
1889 else
1890 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK
1891
1892 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1893 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1894
1895 set_opt(sbi->s_mount_opt, RESERVATION);
1896
1e2462f9
MC
1897 /*
1898 * turn on extents feature by default in ext4 filesystem
1899 * User -o noextents to turn it off
1900 */
1901 set_opt(sbi->s_mount_opt, EXTENTS);
3dbd0ede
AK
1902 /*
1903 * turn on mballoc feature by default in ext4 filesystem
1904 * User -o nomballoc to turn it off
1905 */
1906 set_opt(sbi->s_mount_opt, MBALLOC);
1e2462f9 1907
ac27a0ec
DK
1908 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1909 NULL, 0))
1910 goto failed_mount;
1911
1912 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 1913 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 1914
617ba13b
MC
1915 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1916 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1917 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1918 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 1919 printk(KERN_WARNING
617ba13b 1920 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec
DK
1921 "running e2fsck is recommended\n");
1922 /*
1923 * Check feature flags regardless of the revision level, since we
1924 * previously didn't change the revision level when setting the flags,
1925 * so there is a chance incompat flags are set on a rev 0 filesystem.
1926 */
617ba13b 1927 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 1928 if (features) {
617ba13b 1929 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK
1930 "unsupported optional features (%x).\n",
1931 sb->s_id, le32_to_cpu(features));
1932 goto failed_mount;
1933 }
617ba13b 1934 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 1935 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 1936 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK
1937 "unsupported optional features (%x).\n",
1938 sb->s_id, le32_to_cpu(features));
1939 goto failed_mount;
1940 }
0fc1b451
AK
1941 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1942 /*
1943 * Large file size enabled file system can only be
1944 * mount if kernel is build with CONFIG_LSF
1945 */
1946 if (sizeof(root->i_blocks) < sizeof(u64) &&
1947 !(sb->s_flags & MS_RDONLY)) {
1948 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1949 "files cannot be mounted read-write "
1950 "without CONFIG_LSF.\n", sb->s_id);
1951 goto failed_mount;
1952 }
1953 }
ac27a0ec
DK
1954 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1955
617ba13b
MC
1956 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1957 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 1958 printk(KERN_ERR
617ba13b 1959 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK
1960 blocksize, sb->s_id);
1961 goto failed_mount;
1962 }
1963
ac27a0ec 1964 if (sb->s_blocksize != blocksize) {
ce40733c
AK
1965
1966 /* Validate the filesystem blocksize */
1967 if (!sb_set_blocksize(sb, blocksize)) {
1968 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
1969 blocksize);
ac27a0ec
DK
1970 goto failed_mount;
1971 }
1972
1973 brelse (bh);
70bbb3e0
AM
1974 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1975 offset = do_div(logical_sb_block, blocksize);
1976 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK
1977 if (!bh) {
1978 printk(KERN_ERR
617ba13b 1979 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK
1980 goto failed_mount;
1981 }
617ba13b 1982 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 1983 sbi->s_es = es;
617ba13b 1984 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
ac27a0ec 1985 printk (KERN_ERR
617ba13b 1986 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK
1987 goto failed_mount;
1988 }
1989 }
1990
e2b46574 1991 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 1992 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 1993
617ba13b
MC
1994 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1995 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1996 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK
1997 } else {
1998 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1999 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2000 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2001 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec
DK
2002 (sbi->s_inode_size > blocksize)) {
2003 printk (KERN_ERR
617ba13b 2004 "EXT4-fs: unsupported inode size: %d\n",
ac27a0ec
DK
2005 sbi->s_inode_size);
2006 goto failed_mount;
2007 }
ef7f3835
KS
2008 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2009 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2010 }
0d1ee42f
AR
2011 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2012 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2013 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2014 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2015 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2016 printk(KERN_ERR
8fadc143 2017 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR
2018 sbi->s_desc_size);
2019 goto failed_mount;
2020 }
2021 } else
2022 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2023 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2024 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2025 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC
2026 goto cantfind_ext4;
2027 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2028 if (sbi->s_inodes_per_block == 0)
617ba13b 2029 goto cantfind_ext4;
ac27a0ec
DK
2030 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2031 sbi->s_inodes_per_block;
0d1ee42f 2032 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK
2033 sbi->s_sbh = bh;
2034 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW
2035 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2036 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
ac27a0ec
DK
2037 for (i=0; i < 4; i++)
2038 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2039 sbi->s_def_hash_version = es->s_def_hash_version;
2040
2041 if (sbi->s_blocks_per_group > blocksize * 8) {
2042 printk (KERN_ERR
617ba13b 2043 "EXT4-fs: #blocks per group too big: %lu\n",
ac27a0ec
DK
2044 sbi->s_blocks_per_group);
2045 goto failed_mount;
2046 }
ac27a0ec
DK
2047 if (sbi->s_inodes_per_group > blocksize * 8) {
2048 printk (KERN_ERR
617ba13b 2049 "EXT4-fs: #inodes per group too big: %lu\n",
ac27a0ec
DK
2050 sbi->s_inodes_per_group);
2051 goto failed_mount;
2052 }
2053
bd81d8ee 2054 if (ext4_blocks_count(es) >
ac27a0ec 2055 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2056 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK
2057 " too large to mount safely\n", sb->s_id);
2058 if (sizeof(sector_t) < 8)
617ba13b 2059 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK
2060 "enabled\n");
2061 goto failed_mount;
2062 }
2063
617ba13b
MC
2064 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2065 goto cantfind_ext4;
e7c95593
ES
2066
2067 /* ensure blocks_count calculation below doesn't sign-extend */
2068 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2069 le32_to_cpu(es->s_first_data_block) + 1) {
2070 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2071 "first data block %u, blocks per group %lu\n",
2072 ext4_blocks_count(es),
2073 le32_to_cpu(es->s_first_data_block),
2074 EXT4_BLOCKS_PER_GROUP(sb));
2075 goto failed_mount;
2076 }
bd81d8ee
LV
2077 blocks_count = (ext4_blocks_count(es) -
2078 le32_to_cpu(es->s_first_data_block) +
2079 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2080 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2081 sbi->s_groups_count = blocks_count;
617ba13b
MC
2082 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2083 EXT4_DESC_PER_BLOCK(sb);
ac27a0ec
DK
2084 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2085 GFP_KERNEL);
2086 if (sbi->s_group_desc == NULL) {
617ba13b 2087 printk (KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK
2088 goto failed_mount;
2089 }
2090
2091 bgl_lock_init(&sbi->s_blockgroup_lock);
2092
2093 for (i = 0; i < db_count; i++) {
70bbb3e0 2094 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK
2095 sbi->s_group_desc[i] = sb_bread(sb, block);
2096 if (!sbi->s_group_desc[i]) {
617ba13b 2097 printk (KERN_ERR "EXT4-fs: "
ac27a0ec
DK
2098 "can't read group descriptor %d\n", i);
2099 db_count = i;
2100 goto failed_mount2;
2101 }
2102 }
617ba13b
MC
2103 if (!ext4_check_descriptors (sb)) {
2104 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK
2105 goto failed_mount2;
2106 }
2107 sbi->s_gdb_count = db_count;
2108 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2109 spin_lock_init(&sbi->s_next_gen_lock);
2110
833f4077
PZ
2111 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2112 ext4_count_free_blocks(sb));
2113 if (!err) {
2114 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2115 ext4_count_free_inodes(sb));
2116 }
2117 if (!err) {
2118 err = percpu_counter_init(&sbi->s_dirs_counter,
2119 ext4_count_dirs(sb));
2120 }
2121 if (err) {
2122 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2123 goto failed_mount3;
2124 }
ac27a0ec
DK
2125
2126 /* per fileystem reservation list head & lock */
2127 spin_lock_init(&sbi->s_rsv_window_lock);
2128 sbi->s_rsv_window_root = RB_ROOT;
2129 /* Add a single, static dummy reservation to the start of the
2130 * reservation window list --- it gives us a placeholder for
2131 * append-at-start-of-list which makes the allocation logic
2132 * _much_ simpler. */
617ba13b
MC
2133 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2134 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK
2135 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2136 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2137 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2138
c9de560d
AT
2139 sbi->s_stripe = ext4_get_stripe_size(sbi);
2140
ac27a0ec
DK
2141 /*
2142 * set up enough so that it can read an inode
2143 */
617ba13b
MC
2144 sb->s_op = &ext4_sops;
2145 sb->s_export_op = &ext4_export_ops;
2146 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2147#ifdef CONFIG_QUOTA
617ba13b
MC
2148 sb->s_qcop = &ext4_qctl_operations;
2149 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK
2150#endif
2151 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2152
2153 sb->s_root = NULL;
2154
2155 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC
2156 EXT4_HAS_INCOMPAT_FEATURE(sb,
2157 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK
2158
2159 /*
2160 * The first inode we look at is the journal inode. Don't try
2161 * root first: it may be modified in the journal!
2162 */
2163 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC
2164 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2165 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec
DK
2166 goto failed_mount3;
2167 } else if (journal_inum) {
617ba13b 2168 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK
2169 goto failed_mount3;
2170 } else {
2171 if (!silent)
2172 printk (KERN_ERR
617ba13b 2173 "ext4: No journal on filesystem on %s\n",
ac27a0ec
DK
2174 sb->s_id);
2175 goto failed_mount3;
2176 }
2177
eb40a09c
JS
2178 if (ext4_blocks_count(es) > 0xffffffffULL &&
2179 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2180 JBD2_FEATURE_INCOMPAT_64BIT)) {
2181 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2182 goto failed_mount4;
2183 }
2184
818d276c
GS
2185 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2186 jbd2_journal_set_features(sbi->s_journal,
2187 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2188 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2189 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2190 jbd2_journal_set_features(sbi->s_journal,
2191 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2192 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2193 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2194 } else {
2195 jbd2_journal_clear_features(sbi->s_journal,
2196 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2197 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2198 }
2199
ac27a0ec
DK
2200 /* We have now updated the journal if required, so we can
2201 * validate the data journaling mode. */
2202 switch (test_opt(sb, DATA_FLAGS)) {
2203 case 0:
2204 /* No mode set, assume a default based on the journal
63f57933
AM
2205 * capabilities: ORDERED_DATA if the journal can
2206 * cope, else JOURNAL_DATA
2207 */
dab291af
MC
2208 if (jbd2_journal_check_available_features
2209 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK
2210 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2211 else
2212 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2213 break;
2214
617ba13b
MC
2215 case EXT4_MOUNT_ORDERED_DATA:
2216 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC
2217 if (!jbd2_journal_check_available_features
2218 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2219 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK
2220 "requested data journaling mode\n");
2221 goto failed_mount4;
2222 }
2223 default:
2224 break;
2225 }
2226
2227 if (test_opt(sb, NOBH)) {
617ba13b
MC
2228 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2229 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK
2230 "its supported only with writeback mode\n");
2231 clear_opt(sbi->s_mount_opt, NOBH);
2232 }
2233 }
2234 /*
dab291af 2235 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK
2236 * so we can safely mount the rest of the filesystem now.
2237 */
2238
1d1fe1ee
DH
2239 root = ext4_iget(sb, EXT4_ROOT_INO);
2240 if (IS_ERR(root)) {
617ba13b 2241 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2242 ret = PTR_ERR(root);
ac27a0ec
DK
2243 goto failed_mount4;
2244 }
2245 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2246 iput(root);
617ba13b 2247 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK
2248 goto failed_mount4;
2249 }
1d1fe1ee
DH
2250 sb->s_root = d_alloc_root(root);
2251 if (!sb->s_root) {
2252 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2253 iput(root);
2254 ret = -ENOMEM;
2255 goto failed_mount4;
2256 }
ac27a0ec 2257
617ba13b 2258 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS
2259
2260 /* determine the minimum size of new large inodes, if present */
2261 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2262 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2263 EXT4_GOOD_OLD_INODE_SIZE;
2264 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2265 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2266 if (sbi->s_want_extra_isize <
2267 le16_to_cpu(es->s_want_extra_isize))
2268 sbi->s_want_extra_isize =
2269 le16_to_cpu(es->s_want_extra_isize);
2270 if (sbi->s_want_extra_isize <
2271 le16_to_cpu(es->s_min_extra_isize))
2272 sbi->s_want_extra_isize =
2273 le16_to_cpu(es->s_min_extra_isize);
2274 }
2275 }
2276 /* Check if enough inode space is available */
2277 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2278 sbi->s_inode_size) {
2279 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2280 EXT4_GOOD_OLD_INODE_SIZE;
2281 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2282 "available.\n");
2283 }
2284
ac27a0ec
DK
2285 /*
2286 * akpm: core read_super() calls in here with the superblock locked.
2287 * That deadlocks, because orphan cleanup needs to lock the superblock
2288 * in numerous places. Here we just pop the lock - it's relatively
2289 * harmless, because we are now ready to accept write_super() requests,
2290 * and aviro says that's the only reason for hanging onto the
2291 * superblock lock.
2292 */
617ba13b
MC
2293 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2294 ext4_orphan_cleanup(sb, es);
2295 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2296 if (needs_recovery)
617ba13b
MC
2297 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2298 ext4_mark_recovery_complete(sb, es);
2299 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2300 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2301 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
ac27a0ec
DK
2302 "writeback");
2303
a86c6181 2304 ext4_ext_init(sb);
c9de560d 2305 ext4_mb_init(sb, needs_recovery);
a86c6181 2306
ac27a0ec
DK
2307 lock_kernel();
2308 return 0;
2309
617ba13b 2310cantfind_ext4:
ac27a0ec 2311 if (!silent)
617ba13b 2312 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK
2313 sb->s_id);
2314 goto failed_mount;
2315
2316failed_mount4:
dab291af 2317 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec
DK
2318failed_mount3:
2319 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2320 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2321 percpu_counter_destroy(&sbi->s_dirs_counter);
2322failed_mount2:
2323 for (i = 0; i < db_count; i++)
2324 brelse(sbi->s_group_desc[i]);
2325 kfree(sbi->s_group_desc);
2326failed_mount:
2327#ifdef CONFIG_QUOTA
2328 for (i = 0; i < MAXQUOTAS; i++)
2329 kfree(sbi->s_qf_names[i]);
2330#endif
617ba13b 2331 ext4_blkdev_remove(sbi);
ac27a0ec
DK
2332 brelse(bh);
2333out_fail:
2334 sb->s_fs_info = NULL;
2335 kfree(sbi);
2336 lock_kernel();
1d1fe1ee 2337 return ret;
ac27a0ec
DK
2338}
2339
2340/*
2341 * Setup any per-fs journal parameters now. We'll do this both on
2342 * initial mount, once the journal has been initialised but before we've
2343 * done any recovery; and again on any subsequent remount.
2344 */
617ba13b 2345static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2346{
617ba13b 2347 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK
2348
2349 if (sbi->s_commit_interval)
2350 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2351 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK
2352 * interval here, but for now we'll just fall back to the jbd
2353 * default. */
2354
2355 spin_lock(&journal->j_state_lock);
2356 if (test_opt(sb, BARRIER))
dab291af 2357 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2358 else
dab291af 2359 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK
2360 spin_unlock(&journal->j_state_lock);
2361}
2362
617ba13b 2363static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK
2364 unsigned int journal_inum)
2365{
2366 struct inode *journal_inode;
2367 journal_t *journal;
2368
2369 /* First, test for the existence of a valid inode on disk. Bad
2370 * things happen if we iget() an unused inode, as the subsequent
2371 * iput() will try to delete it. */
2372
1d1fe1ee
DH
2373 journal_inode = ext4_iget(sb, journal_inum);
2374 if (IS_ERR(journal_inode)) {
617ba13b 2375 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK
2376 return NULL;
2377 }
2378 if (!journal_inode->i_nlink) {
2379 make_bad_inode(journal_inode);
2380 iput(journal_inode);
617ba13b 2381 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK
2382 return NULL;
2383 }
2384
2385 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2386 journal_inode, journal_inode->i_size);
1d1fe1ee 2387 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2388 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK
2389 iput(journal_inode);
2390 return NULL;
2391 }
2392
dab291af 2393 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2394 if (!journal) {
617ba13b 2395 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK
2396 iput(journal_inode);
2397 return NULL;
2398 }
2399 journal->j_private = sb;
617ba13b 2400 ext4_init_journal_params(sb, journal);
ac27a0ec
DK
2401 return journal;
2402}
2403
617ba13b 2404static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK
2405 dev_t j_dev)
2406{
2407 struct buffer_head * bh;
2408 journal_t *journal;
617ba13b
MC
2409 ext4_fsblk_t start;
2410 ext4_fsblk_t len;
ac27a0ec 2411 int hblock, blocksize;
617ba13b 2412 ext4_fsblk_t sb_block;
ac27a0ec 2413 unsigned long offset;
617ba13b 2414 struct ext4_super_block * es;
ac27a0ec
DK
2415 struct block_device *bdev;
2416
617ba13b 2417 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK
2418 if (bdev == NULL)
2419 return NULL;
2420
2421 if (bd_claim(bdev, sb)) {
2422 printk(KERN_ERR
8c55e204 2423 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK
2424 blkdev_put(bdev);
2425 return NULL;
2426 }
2427
2428 blocksize = sb->s_blocksize;
2429 hblock = bdev_hardsect_size(bdev);
2430 if (blocksize < hblock) {
2431 printk(KERN_ERR
617ba13b 2432 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK
2433 goto out_bdev;
2434 }
2435
617ba13b
MC
2436 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2437 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK
2438 set_blocksize(bdev, blocksize);
2439 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2440 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK
2441 "external journal\n");
2442 goto out_bdev;
2443 }
2444
617ba13b
MC
2445 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2446 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2447 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC
2448 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2449 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK
2450 "bad superblock\n");
2451 brelse(bh);
2452 goto out_bdev;
2453 }
2454
617ba13b
MC
2455 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2456 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK
2457 brelse(bh);
2458 goto out_bdev;
2459 }
2460
bd81d8ee 2461 len = ext4_blocks_count(es);
ac27a0ec
DK
2462 start = sb_block + 1;
2463 brelse(bh); /* we're done with the superblock */
2464
dab291af 2465 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK
2466 start, len, blocksize);
2467 if (!journal) {
617ba13b 2468 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK
2469 goto out_bdev;
2470 }
2471 journal->j_private = sb;
2472 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2473 wait_on_buffer(journal->j_sb_buffer);
2474 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2475 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK
2476 goto out_journal;
2477 }
2478 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2479 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK
2480 "user (unsupported) - %d\n",
2481 be32_to_cpu(journal->j_superblock->s_nr_users));
2482 goto out_journal;
2483 }
617ba13b
MC
2484 EXT4_SB(sb)->journal_bdev = bdev;
2485 ext4_init_journal_params(sb, journal);
ac27a0ec
DK
2486 return journal;
2487out_journal:
dab291af 2488 jbd2_journal_destroy(journal);
ac27a0ec 2489out_bdev:
617ba13b 2490 ext4_blkdev_put(bdev);
ac27a0ec
DK
2491 return NULL;
2492}
2493
617ba13b
MC
2494static int ext4_load_journal(struct super_block *sb,
2495 struct ext4_super_block *es,
ac27a0ec
DK
2496 unsigned long journal_devnum)
2497{
2498 journal_t *journal;
2499 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2500 dev_t journal_dev;
2501 int err = 0;
2502 int really_read_only;
2503
2504 if (journal_devnum &&
2505 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2506 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK
2507 "numbers have changed\n");
2508 journal_dev = new_decode_dev(journal_devnum);
2509 } else
2510 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2511
2512 really_read_only = bdev_read_only(sb->s_bdev);
2513
2514 /*
2515 * Are we loading a blank journal or performing recovery after a
2516 * crash? For recovery, we need to check in advance whether we
2517 * can get read-write access to the device.
2518 */
2519
617ba13b 2520 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2521 if (sb->s_flags & MS_RDONLY) {
617ba13b 2522 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK
2523 "required on readonly filesystem.\n");
2524 if (really_read_only) {
617ba13b 2525 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK
2526 "unavailable, cannot proceed.\n");
2527 return -EROFS;
2528 }
617ba13b 2529 printk (KERN_INFO "EXT4-fs: write access will "
ac27a0ec
DK
2530 "be enabled during recovery.\n");
2531 }
2532 }
2533
2534 if (journal_inum && journal_dev) {
617ba13b 2535 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK
2536 "and inode journals!\n");
2537 return -EINVAL;
2538 }
2539
2540 if (journal_inum) {
617ba13b 2541 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK
2542 return -EINVAL;
2543 } else {
617ba13b 2544 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK
2545 return -EINVAL;
2546 }
2547
2548 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2549 err = jbd2_journal_update_format(journal);
ac27a0ec 2550 if (err) {
617ba13b 2551 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2552 jbd2_journal_destroy(journal);
ac27a0ec
DK
2553 return err;
2554 }
2555 }
2556
617ba13b 2557 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2558 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2559 if (!err)
dab291af 2560 err = jbd2_journal_load(journal);
ac27a0ec
DK
2561
2562 if (err) {
617ba13b 2563 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2564 jbd2_journal_destroy(journal);
ac27a0ec
DK
2565 return err;
2566 }
2567
617ba13b
MC
2568 EXT4_SB(sb)->s_journal = journal;
2569 ext4_clear_journal_err(sb, es);
ac27a0ec
DK
2570
2571 if (journal_devnum &&
2572 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2573 es->s_journal_dev = cpu_to_le32(journal_devnum);
2574 sb->s_dirt = 1;
2575
2576 /* Make sure we flush the recovery flag to disk. */
617ba13b 2577 ext4_commit_super(sb, es, 1);
ac27a0ec
DK
2578 }
2579
2580 return 0;
2581}
2582
617ba13b
MC
2583static int ext4_create_journal(struct super_block * sb,
2584 struct ext4_super_block * es,
ac27a0ec
DK
2585 unsigned int journal_inum)
2586{
2587 journal_t *journal;
6c675bd4 2588 int err;
ac27a0ec
DK
2589
2590 if (sb->s_flags & MS_RDONLY) {
617ba13b 2591 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK
2592 "create journal.\n");
2593 return -EROFS;
2594 }
2595
6c675bd4
BP
2596 journal = ext4_get_journal(sb, journal_inum);
2597 if (!journal)
ac27a0ec
DK
2598 return -EINVAL;
2599
617ba13b 2600 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK
2601 journal_inum);
2602
6c675bd4
BP
2603 err = jbd2_journal_create(journal);
2604 if (err) {
617ba13b 2605 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2606 jbd2_journal_destroy(journal);
ac27a0ec
DK
2607 return -EIO;
2608 }
2609
617ba13b 2610 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2611
617ba13b
MC
2612 ext4_update_dynamic_rev(sb);
2613 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2614 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK
2615
2616 es->s_journal_inum = cpu_to_le32(journal_inum);
2617 sb->s_dirt = 1;
2618
2619 /* Make sure we flush the recovery flag to disk. */
617ba13b 2620 ext4_commit_super(sb, es, 1);
ac27a0ec
DK
2621
2622 return 0;
2623}
2624
617ba13b
MC
2625static void ext4_commit_super (struct super_block * sb,
2626 struct ext4_super_block * es,
ac27a0ec
DK
2627 int sync)
2628{
617ba13b 2629 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK
2630
2631 if (!sbh)
2632 return;
2633 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2634 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2635 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK
2636 BUFFER_TRACE(sbh, "marking dirty");
2637 mark_buffer_dirty(sbh);
2638 if (sync)
2639 sync_dirty_buffer(sbh);
2640}
2641
2642
2643/*
2644 * Have we just finished recovery? If so, and if we are mounting (or
2645 * remounting) the filesystem readonly, then we will end up with a
2646 * consistent fs on disk. Record that fact.
2647 */
617ba13b
MC
2648static void ext4_mark_recovery_complete(struct super_block * sb,
2649 struct ext4_super_block * es)
ac27a0ec 2650{
617ba13b 2651 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2652
dab291af
MC
2653 jbd2_journal_lock_updates(journal);
2654 jbd2_journal_flush(journal);
32c37730 2655 lock_super(sb);
617ba13b 2656 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2657 sb->s_flags & MS_RDONLY) {
617ba13b 2658 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2659 sb->s_dirt = 0;
617ba13b 2660 ext4_commit_super(sb, es, 1);
ac27a0ec 2661 }
32c37730 2662 unlock_super(sb);
dab291af 2663 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK
2664}
2665
2666/*
2667 * If we are mounting (or read-write remounting) a filesystem whose journal
2668 * has recorded an error from a previous lifetime, move that error to the
2669 * main filesystem now.
2670 */
617ba13b
MC
2671static void ext4_clear_journal_err(struct super_block * sb,
2672 struct ext4_super_block * es)
ac27a0ec
DK
2673{
2674 journal_t *journal;
2675 int j_errno;
2676 const char *errstr;
2677
617ba13b 2678 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK
2679
2680 /*
2681 * Now check for any error status which may have been recorded in the
617ba13b 2682 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK
2683 */
2684
dab291af 2685 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK
2686 if (j_errno) {
2687 char nbuf[16];
2688
617ba13b
MC
2689 errstr = ext4_decode_error(sb, j_errno, nbuf);
2690 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
ac27a0ec 2691 "from previous mount: %s", errstr);
617ba13b 2692 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
ac27a0ec
DK
2693 "filesystem check.");
2694
617ba13b
MC
2695 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2696 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2697 ext4_commit_super (sb, es, 1);
ac27a0ec 2698
dab291af 2699 jbd2_journal_clear_err(journal);
ac27a0ec
DK
2700 }
2701}
2702
2703/*
2704 * Force the running and committing transactions to commit,
2705 * and wait on the commit.
2706 */
617ba13b 2707int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK
2708{
2709 journal_t *journal;
2710 int ret;
2711
2712 if (sb->s_flags & MS_RDONLY)
2713 return 0;
2714
617ba13b 2715 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2716 sb->s_dirt = 0;
617ba13b 2717 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK
2718 return ret;
2719}
2720
2721/*
617ba13b 2722 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK
2723 * have to propagate any other updates to the superblock on disk at this
2724 * point. Just start an async writeback to get the buffers on their way
2725 * to the disk.
2726 *
2727 * This implicitly triggers the writebehind on sync().
2728 */
2729
617ba13b 2730static void ext4_write_super (struct super_block * sb)
ac27a0ec
DK
2731{
2732 if (mutex_trylock(&sb->s_lock) != 0)
2733 BUG();
2734 sb->s_dirt = 0;
2735}
2736
617ba13b 2737static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK
2738{
2739 tid_t target;
2740
2741 sb->s_dirt = 0;
dab291af 2742 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2743 if (wait)
dab291af 2744 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK
2745 }
2746 return 0;
2747}
2748
2749/*
2750 * LVM calls this function before a (read-only) snapshot is created. This
2751 * gives us a chance to flush the journal completely and mark the fs clean.
2752 */
617ba13b 2753static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK
2754{
2755 sb->s_dirt = 0;
2756
2757 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2758 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK
2759
2760 /* Now we set up the journal barrier. */
dab291af
MC
2761 jbd2_journal_lock_updates(journal);
2762 jbd2_journal_flush(journal);
ac27a0ec
DK
2763
2764 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC
2765 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2766 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK
2767 }
2768}
2769
2770/*
2771 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2772 * flag here, even though the filesystem is not technically dirty yet.
2773 */
617ba13b 2774static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK
2775{
2776 if (!(sb->s_flags & MS_RDONLY)) {
2777 lock_super(sb);
2778 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC
2779 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2780 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2781 unlock_super(sb);
dab291af 2782 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK
2783 }
2784}
2785
617ba13b 2786static int ext4_remount (struct super_block * sb, int * flags, char * data)
ac27a0ec 2787{
617ba13b
MC
2788 struct ext4_super_block * es;
2789 struct ext4_sb_info *sbi = EXT4_SB(sb);
2790 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2791 unsigned long old_sb_flags;
617ba13b 2792 struct ext4_mount_options old_opts;
ac27a0ec
DK
2793 int err;
2794#ifdef CONFIG_QUOTA
2795 int i;
2796#endif
2797
2798 /* Store the original options */
2799 old_sb_flags = sb->s_flags;
2800 old_opts.s_mount_opt = sbi->s_mount_opt;
2801 old_opts.s_resuid = sbi->s_resuid;
2802 old_opts.s_resgid = sbi->s_resgid;
2803 old_opts.s_commit_interval = sbi->s_commit_interval;
2804#ifdef CONFIG_QUOTA
2805 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2806 for (i = 0; i < MAXQUOTAS; i++)
2807 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2808#endif
2809
2810 /*
2811 * Allow the "check" option to be passed as a remount option.
2812 */
2813 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2814 err = -EINVAL;
2815 goto restore_opts;
2816 }
2817
617ba13b
MC
2818 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2819 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
ac27a0ec
DK
2820
2821 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2822 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK
2823
2824 es = sbi->s_es;
2825
617ba13b 2826 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK
2827
2828 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 2829 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 2830 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK
2831 err = -EROFS;
2832 goto restore_opts;
2833 }
2834
2835 if (*flags & MS_RDONLY) {
2836 /*
2837 * First of all, the unconditional stuff we have to do
2838 * to disable replay of the journal when we next remount
2839 */
2840 sb->s_flags |= MS_RDONLY;
2841
2842 /*
2843 * OK, test if we are remounting a valid rw partition
2844 * readonly, and if so set the rdonly flag and then
2845 * mark the partition as valid again.
2846 */
617ba13b
MC
2847 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2848 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK
2849 es->s_state = cpu_to_le16(sbi->s_mount_state);
2850
32c37730
JK
2851 /*
2852 * We have to unlock super so that we can wait for
2853 * transactions.
2854 */
2855 unlock_super(sb);
617ba13b 2856 ext4_mark_recovery_complete(sb, es);
32c37730 2857 lock_super(sb);
ac27a0ec
DK
2858 } else {
2859 __le32 ret;
617ba13b
MC
2860 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2861 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2862 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK
2863 "remount RDWR because of unsupported "
2864 "optional features (%x).\n",
2865 sb->s_id, le32_to_cpu(ret));
2866 err = -EROFS;
2867 goto restore_opts;
2868 }
ead6596b
ES
2869
2870 /*
2871 * If we have an unprocessed orphan list hanging
2872 * around from a previously readonly bdev mount,
2873 * require a full umount/remount for now.
2874 */
2875 if (es->s_last_orphan) {
2876 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2877 "remount RDWR because of unprocessed "
2878 "orphan inode list. Please "
2879 "umount/remount instead.\n",
2880 sb->s_id);
2881 err = -EINVAL;
2882 goto restore_opts;
2883 }
2884
ac27a0ec
DK
2885 /*
2886 * Mounting a RDONLY partition read-write, so reread
2887 * and store the current valid flag. (It may have
2888 * been changed by e2fsck since we originally mounted
2889 * the partition.)
2890 */
617ba13b 2891 ext4_clear_journal_err(sb, es);
ac27a0ec 2892 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 2893 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 2894 goto restore_opts;
617ba13b 2895 if (!ext4_setup_super (sb, es, 0))
ac27a0ec
DK
2896 sb->s_flags &= ~MS_RDONLY;
2897 }
2898 }
2899#ifdef CONFIG_QUOTA
2900 /* Release old quota file names */
2901 for (i = 0; i < MAXQUOTAS; i++)
2902 if (old_opts.s_qf_names[i] &&
2903 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2904 kfree(old_opts.s_qf_names[i]);
2905#endif
2906 return 0;
2907restore_opts:
2908 sb->s_flags = old_sb_flags;
2909 sbi->s_mount_opt = old_opts.s_mount_opt;
2910 sbi->s_resuid = old_opts.s_resuid;
2911 sbi->s_resgid = old_opts.s_resgid;
2912 sbi->s_commit_interval = old_opts.s_commit_interval;
2913#ifdef CONFIG_QUOTA
2914 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2915 for (i = 0; i < MAXQUOTAS; i++) {
2916 if (sbi->s_qf_names[i] &&
2917 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2918 kfree(sbi->s_qf_names[i]);
2919 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2920 }
2921#endif
2922 return err;
2923}
2924
617ba13b 2925static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
ac27a0ec
DK
2926{
2927 struct super_block *sb = dentry->d_sb;
617ba13b
MC
2928 struct ext4_sb_info *sbi = EXT4_SB(sb);
2929 struct ext4_super_block *es = sbi->s_es;
960cc398 2930 u64 fsid;
ac27a0ec 2931
5e70030d
BP
2932 if (test_opt(sb, MINIX_DF)) {
2933 sbi->s_overhead_last = 0;
6bc9feff 2934 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 2935 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 2936 ext4_fsblk_t overhead = 0;
ac27a0ec
DK
2937 smp_rmb();
2938
2939 /*
5e70030d
BP
2940 * Compute the overhead (FS structures). This is constant
2941 * for a given filesystem unless the number of block groups
2942 * changes so we cache the previous value until it does.
ac27a0ec
DK
2943 */
2944
2945 /*
2946 * All of the blocks before first_data_block are
2947 * overhead
2948 */
2949 overhead = le32_to_cpu(es->s_first_data_block);
2950
2951 /*
2952 * Add the overhead attributed to the superblock and
2953 * block group descriptors. If the sparse superblocks
2954 * feature is turned on, then not all groups have this.
2955 */
2956 for (i = 0; i < ngroups; i++) {
617ba13b
MC
2957 overhead += ext4_bg_has_super(sb, i) +
2958 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK
2959 cond_resched();
2960 }
2961
2962 /*
2963 * Every block group has an inode bitmap, a block
2964 * bitmap, and an inode table.
2965 */
5e70030d
BP
2966 overhead += ngroups * (2 + sbi->s_itb_per_group);
2967 sbi->s_overhead_last = overhead;
2968 smp_wmb();
6bc9feff 2969 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK
2970 }
2971
617ba13b 2972 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 2973 buf->f_bsize = sb->s_blocksize;
5e70030d 2974 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
52d9f3b4 2975 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
308ba3ec 2976 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV
2977 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2978 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK
2979 buf->f_bavail = 0;
2980 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2981 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 2982 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 2983 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE
2984 fsid = le64_to_cpup((void *)es->s_uuid) ^
2985 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2986 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2987 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK
2988 return 0;
2989}
2990
2991/* Helper function for writing quotas on sync - we need to start transaction before quota file
2992 * is locked for write. Otherwise the are possible deadlocks:
2993 * Process 1 Process 2
617ba13b 2994 * ext4_create() quota_sync()
dab291af 2995 * jbd2_journal_start() write_dquot()
ac27a0ec 2996 * DQUOT_INIT() down(dqio_mutex)
dab291af 2997 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK
2998 *
2999 */
3000
3001#ifdef CONFIG_QUOTA
3002
3003static inline struct inode *dquot_to_inode(struct dquot *dquot)
3004{
3005 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3006}
3007
617ba13b 3008static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK
3009{
3010 handle_t *handle;
3011 int ret, err;
3012
3013 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3014 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK
3015 if (IS_ERR(handle))
3016 return PTR_ERR(handle);
3017 ret = dquot_initialize(inode, type);
617ba13b 3018 err = ext4_journal_stop(handle);
ac27a0ec
DK
3019 if (!ret)
3020 ret = err;
3021 return ret;
3022}
3023
617ba13b 3024static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK
3025{
3026 handle_t *handle;
3027 int ret, err;
3028
3029 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3030 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
ac27a0ec
DK
3031 if (IS_ERR(handle))
3032 return PTR_ERR(handle);
3033 ret = dquot_drop(inode);
617ba13b 3034 err = ext4_journal_stop(handle);
ac27a0ec
DK
3035 if (!ret)
3036 ret = err;
3037 return ret;
3038}
3039
617ba13b 3040static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK
3041{
3042 int ret, err;
3043 handle_t *handle;
3044 struct inode *inode;
3045
3046 inode = dquot_to_inode(dquot);
617ba13b
MC
3047 handle = ext4_journal_start(inode,
3048 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK
3049 if (IS_ERR(handle))
3050 return PTR_ERR(handle);
3051 ret = dquot_commit(dquot);
617ba13b 3052 err = ext4_journal_stop(handle);
ac27a0ec
DK
3053 if (!ret)
3054 ret = err;
3055 return ret;
3056}
3057
617ba13b 3058static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK
3059{
3060 int ret, err;
3061 handle_t *handle;
3062
617ba13b
MC
3063 handle = ext4_journal_start(dquot_to_inode(dquot),
3064 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK
3065 if (IS_ERR(handle))
3066 return PTR_ERR(handle);
3067 ret = dquot_acquire(dquot);
617ba13b 3068 err = ext4_journal_stop(handle);
ac27a0ec
DK
3069 if (!ret)
3070 ret = err;
3071 return ret;
3072}
3073
617ba13b 3074static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK
3075{
3076 int ret, err;
3077 handle_t *handle;
3078
617ba13b
MC
3079 handle = ext4_journal_start(dquot_to_inode(dquot),
3080 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK
3081 if (IS_ERR(handle)) {
3082 /* Release dquot anyway to avoid endless cycle in dqput() */
3083 dquot_release(dquot);
ac27a0ec 3084 return PTR_ERR(handle);
9c3013e9 3085 }
ac27a0ec 3086 ret = dquot_release(dquot);
617ba13b 3087 err = ext4_journal_stop(handle);
ac27a0ec
DK
3088 if (!ret)
3089 ret = err;
3090 return ret;
3091}
3092
617ba13b 3093static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec
DK
3094{
3095 /* Are we journalling quotas? */
617ba13b
MC
3096 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3097 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3098 dquot_mark_dquot_dirty(dquot);
617ba13b 3099 return ext4_write_dquot(dquot);
ac27a0ec
DK
3100 } else {
3101 return dquot_mark_dquot_dirty(dquot);
3102 }
3103}
3104
617ba13b 3105static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK
3106{
3107 int ret, err;
3108 handle_t *handle;
3109
3110 /* Data block + inode block */
617ba13b 3111 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK
3112 if (IS_ERR(handle))
3113 return PTR_ERR(handle);
3114 ret = dquot_commit_info(sb, type);
617ba13b 3115 err = ext4_journal_stop(handle);
ac27a0ec
DK
3116 if (!ret)
3117 ret = err;
3118 return ret;
3119}
3120
3121/*
3122 * Turn on quotas during mount time - we need to find
3123 * the quota file and such...
3124 */
617ba13b 3125static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3126{
617ba13b
MC
3127 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3128 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK
3129}
3130
3131/*
3132 * Standard function to be called on quota_on
3133 */
617ba13b 3134static int ext4_quota_on(struct super_block *sb, int type, int format_id,
ac27a0ec
DK
3135 char *path)
3136{
3137 int err;
3138 struct nameidata nd;
3139
3140 if (!test_opt(sb, QUOTA))
3141 return -EINVAL;
3142 /* Not journalling quota? */
617ba13b
MC
3143 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3144 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
ac27a0ec
DK
3145 return vfs_quota_on(sb, type, format_id, path);
3146 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3147 if (err)
3148 return err;
3149 /* Quotafile not on the same filesystem? */
3150 if (nd.mnt->mnt_sb != sb) {
3151 path_release(&nd);
3152 return -EXDEV;
3153 }
3154 /* Quotafile not of fs root? */
3155 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
3156 printk(KERN_WARNING
617ba13b 3157 "EXT4-fs: Quota file not on filesystem root. "
ac27a0ec
DK
3158 "Journalled quota will not work.\n");
3159 path_release(&nd);
3160 return vfs_quota_on(sb, type, format_id, path);
3161}
3162
3163/* Read data from quotafile - avoid pagecache and such because we cannot afford
3164 * acquiring the locks... As quota files are never truncated and quota code
3165 * itself serializes the operations (and noone else should touch the files)
3166 * we don't have to be afraid of races */
617ba13b 3167static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK
3168 size_t len, loff_t off)
3169{
3170 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3171 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK
3172 int err = 0;
3173 int offset = off & (sb->s_blocksize - 1);
3174 int tocopy;
3175 size_t toread;
3176 struct buffer_head *bh;
3177 loff_t i_size = i_size_read(inode);
3178
3179 if (off > i_size)
3180 return 0;
3181 if (off+len > i_size)
3182 len = i_size-off;
3183 toread = len;
3184 while (toread > 0) {
3185 tocopy = sb->s_blocksize - offset < toread ?
3186 sb->s_blocksize - offset : toread;
617ba13b 3187 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK
3188 if (err)
3189 return err;
3190 if (!bh) /* A hole? */
3191 memset(data, 0, tocopy);
3192 else
3193 memcpy(data, bh->b_data+offset, tocopy);
3194 brelse(bh);
3195 offset = 0;
3196 toread -= tocopy;
3197 data += tocopy;
3198 blk++;
3199 }
3200 return len;
3201}
3202
3203/* Write to quotafile (we know the transaction is already started and has
3204 * enough credits) */
617ba13b 3205static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK
3206 const char *data, size_t len, loff_t off)
3207{
3208 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3209 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK
3210 int err = 0;
3211 int offset = off & (sb->s_blocksize - 1);
3212 int tocopy;
617ba13b 3213 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK
3214 size_t towrite = len;
3215 struct buffer_head *bh;
3216 handle_t *handle = journal_current_handle();
3217
9c3013e9
JK
3218 if (!handle) {
3219 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3220 " cancelled because transaction is not started.\n",
3221 (unsigned long long)off, (unsigned long long)len);
3222 return -EIO;
3223 }
ac27a0ec
DK
3224 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3225 while (towrite > 0) {
3226 tocopy = sb->s_blocksize - offset < towrite ?
3227 sb->s_blocksize - offset : towrite;
617ba13b 3228 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK
3229 if (!bh)
3230 goto out;
3231 if (journal_quota) {
617ba13b 3232 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK
3233 if (err) {
3234 brelse(bh);
3235 goto out;
3236 }
3237 }
3238 lock_buffer(bh);
3239 memcpy(bh->b_data+offset, data, tocopy);
3240 flush_dcache_page(bh->b_page);
3241 unlock_buffer(bh);
3242 if (journal_quota)
617ba13b 3243 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK
3244 else {
3245 /* Always do at least ordered writes for quotas */
617ba13b 3246 err = ext4_journal_dirty_data(handle, bh);
ac27a0ec
DK
3247 mark_buffer_dirty(bh);
3248 }
3249 brelse(bh);
3250 if (err)
3251 goto out;
3252 offset = 0;
3253 towrite -= tocopy;
3254 data += tocopy;
3255 blk++;
3256 }
3257out:
3258 if (len == towrite)
3259 return err;
3260 if (inode->i_size < off+len-towrite) {
3261 i_size_write(inode, off+len-towrite);
617ba13b 3262 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3263 }
ac27a0ec 3264 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3265 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK
3266 mutex_unlock(&inode->i_mutex);
3267 return len - towrite;
3268}
3269
3270#endif
3271
617ba13b 3272static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK
3273 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3274{
617ba13b 3275 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK
3276}
3277
617ba13b 3278static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3279 .owner = THIS_MODULE,
617ba13b
MC
3280 .name = "ext4dev",
3281 .get_sb = ext4_get_sb,
ac27a0ec
DK
3282 .kill_sb = kill_block_super,
3283 .fs_flags = FS_REQUIRES_DEV,
3284};
3285
617ba13b 3286static int __init init_ext4_fs(void)
ac27a0ec 3287{
c9de560d
AT
3288 int err;
3289
3290 err = init_ext4_mballoc();
ac27a0ec
DK
3291 if (err)
3292 return err;
c9de560d
AT
3293
3294 err = init_ext4_xattr();
3295 if (err)
3296 goto out2;
ac27a0ec
DK
3297 err = init_inodecache();
3298 if (err)
3299 goto out1;
63f57933 3300 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK
3301 if (err)
3302 goto out;
3303 return 0;
3304out:
3305 destroy_inodecache();
3306out1:
617ba13b 3307 exit_ext4_xattr();
c9de560d
AT
3308out2:
3309 exit_ext4_mballoc();
ac27a0ec
DK
3310 return err;
3311}
3312
617ba13b 3313static void __exit exit_ext4_fs(void)
ac27a0ec 3314{
617ba13b 3315 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3316 destroy_inodecache();
617ba13b 3317 exit_ext4_xattr();
c9de560d 3318 exit_ext4_mballoc();
ac27a0ec
DK
3319}
3320
3321MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3322MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3323MODULE_LICENSE("GPL");
617ba13b
MC
3324module_init(init_ext4_fs)
3325module_exit(exit_ext4_fs)