projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
dquot: move dquot drop responsibility into the filesystem
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
29#include <linux/smp_lock.h>
30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
9f6200bb 38#include <linux/proc_fs.h>
3197ebdb 39#include <linux/ctype.h>
1330593e 40#include <linux/log2.h>
717d50e4 41#include <linux/crc16.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
3dcf5451
CH		 44#include "ext4.h"
45#include "ext4_jbd2.h"
ac27a0ec
DK		 46#include "xattr.h"
47#include "acl.h"
3661d286 48#include "mballoc.h"
ac27a0ec 49
9bffad1e
TT		 50#define CREATE_TRACE_POINTS
51#include <trace/events/ext4.h>
52
9f6200bb 53struct proc_dir_entry *ext4_proc_root;
3197ebdb 54static struct kset *ext4_kset;
9f6200bb 55
617ba13b 56static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 57 unsigned long journal_devnum);
e2d67052 58static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 59static void ext4_mark_recovery_complete(struct super_block *sb,
60 struct ext4_super_block *es);
61static void ext4_clear_journal_err(struct super_block *sb,
62 struct ext4_super_block *es);
617ba13b 63static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 64static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 65 char nbuf[16]);
2b2d6d01
TT		 66static int ext4_remount(struct super_block *sb, int *flags, char *data);
67static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 68static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 69static void ext4_write_super(struct super_block *sb);
c4be0c1d 70static int ext4_freeze(struct super_block *sb);
ac27a0ec 71
bd81d8ee 72
8fadc143
AR		 73ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
74 struct ext4_group_desc *bg)
bd81d8ee 75{
3a14589c 76 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 77 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 78 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 79}
80
8fadc143
AR		 81ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
82 struct ext4_group_desc *bg)
bd81d8ee 83{
5272f837 84 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 85 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 86 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 87}
88
8fadc143
AR		 89ext4_fsblk_t ext4_inode_table(struct super_block *sb,
90 struct ext4_group_desc *bg)
bd81d8ee 91{
5272f837 92 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 93 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 94 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 95}
96
560671a0
AK		 97__u32 ext4_free_blks_count(struct super_block *sb,
98 struct ext4_group_desc *bg)
99{
100 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
101 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 102 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 103}
104
105__u32 ext4_free_inodes_count(struct super_block *sb,
106 struct ext4_group_desc *bg)
107{
108 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
109 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 110 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 111}
112
113__u32 ext4_used_dirs_count(struct super_block *sb,
114 struct ext4_group_desc *bg)
115{
116 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
117 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 118 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 119}
120
121__u32 ext4_itable_unused_count(struct super_block *sb,
122 struct ext4_group_desc *bg)
123{
124 return le16_to_cpu(bg->bg_itable_unused_lo) |
125 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 126 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 127}
128
8fadc143
AR		 129void ext4_block_bitmap_set(struct super_block *sb,
130 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 131{
3a14589c 132 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 133 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
134 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 135}
136
8fadc143
AR		 137void ext4_inode_bitmap_set(struct super_block *sb,
138 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 139{
5272f837 140 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 141 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
142 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 143}
144
8fadc143
AR		 145void ext4_inode_table_set(struct super_block *sb,
146 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 147{
5272f837 148 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 149 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
150 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 151}
152
560671a0
AK		 153void ext4_free_blks_set(struct super_block *sb,
154 struct ext4_group_desc *bg, __u32 count)
155{
156 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
157 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
158 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
159}
160
161void ext4_free_inodes_set(struct super_block *sb,
162 struct ext4_group_desc *bg, __u32 count)
163{
164 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
165 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
166 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
167}
168
169void ext4_used_dirs_set(struct super_block *sb,
170 struct ext4_group_desc *bg, __u32 count)
171{
172 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
173 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
174 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
175}
176
177void ext4_itable_unused_set(struct super_block *sb,
178 struct ext4_group_desc *bg, __u32 count)
179{
180 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
181 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
182 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
183}
184
d3d1faf6
CW		 185
186/* Just increment the non-pointer handle value */
187static handle_t *ext4_get_nojournal(void)
188{
189 handle_t *handle = current->journal_info;
190 unsigned long ref_cnt = (unsigned long)handle;
191
192 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
193
194 ref_cnt++;
195 handle = (handle_t *)ref_cnt;
196
197 current->journal_info = handle;
198 return handle;
199}
200
201
202/* Decrement the non-pointer handle value */
203static void ext4_put_nojournal(handle_t *handle)
204{
205 unsigned long ref_cnt = (unsigned long)handle;
206
207 BUG_ON(ref_cnt == 0);
208
209 ref_cnt--;
210 handle = (handle_t *)ref_cnt;
211
212 current->journal_info = handle;
213}
214
ac27a0ec 215/*
dab291af 216 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 217 *
218 * The only special thing we need to do here is to make sure that all
219 * journal_end calls result in the superblock being marked dirty, so
220 * that sync() will call the filesystem's write_super callback if
221 * appropriate.
222 */
617ba13b 223handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 224{
225 journal_t *journal;
226
227 if (sb->s_flags & MS_RDONLY)
228 return ERR_PTR(-EROFS);
229
230 /* Special case here: if the journal has aborted behind our
231 * backs (eg. EIO in the commit thread), then we still need to
232 * take the FS itself readonly cleanly. */
617ba13b 233 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 234 if (journal) {
235 if (is_journal_aborted(journal)) {
0b8e58a1 236 ext4_abort(sb, __func__, "Detected aborted journal");
0390131b
FM		 237 return ERR_PTR(-EROFS);
238 }
239 return jbd2_journal_start(journal, nblocks);
ac27a0ec 240 }
d3d1faf6 241 return ext4_get_nojournal();
ac27a0ec
DK		 242}
243
244/*
245 * The only special thing we need to do here is to make sure that all
dab291af 246 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 247 * that sync() will call the filesystem's write_super callback if
248 * appropriate.
249 */
617ba13b 250int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 251{
252 struct super_block *sb;
253 int err;
254 int rc;
255
0390131b 256 if (!ext4_handle_valid(handle)) {
d3d1faf6 257 ext4_put_nojournal(handle);
0390131b
FM		 258 return 0;
259 }
ac27a0ec
DK		 260 sb = handle->h_transaction->t_journal->j_private;
261 err = handle->h_err;
dab291af 262 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 263
264 if (!err)
265 err = rc;
266 if (err)
617ba13b 267 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 268 return err;
269}
270
617ba13b 271void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 272 struct buffer_head *bh, handle_t *handle, int err)
273{
274 char nbuf[16];
617ba13b 275 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 276
0390131b
FM		 277 BUG_ON(!ext4_handle_valid(handle));
278
ac27a0ec
DK		 279 if (bh)
280 BUFFER_TRACE(bh, "abort");
281
282 if (!handle->h_err)
283 handle->h_err = err;
284
285 if (is_handle_aborted(handle))
286 return;
287
288 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
289 caller, errstr, err_fn);
290
dab291af 291 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 292}
293
294/* Deal with the reporting of failure conditions on a filesystem such as
295 * inconsistencies detected or read IO failures.
296 *
297 * On ext2, we can store the error state of the filesystem in the
617ba13b 298 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 299 * write ordering constraints on the superblock which prevent us from
300 * writing it out straight away; and given that the journal is about to
301 * be aborted, we can't rely on the current, or future, transactions to
302 * write out the superblock safely.
303 *
dab291af 304 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 305 * the journal instead. On recovery, the journal will compain about
306 * that error until we've noted it down and cleared it.
307 */
308
617ba13b 309static void ext4_handle_error(struct super_block *sb)
ac27a0ec 310{
617ba13b 311 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 312
617ba13b
MC		 313 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
314 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 315
316 if (sb->s_flags & MS_RDONLY)
317 return;
318
2b2d6d01 319 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 320 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 321
4ab2f15b 322 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 323 if (journal)
dab291af 324 jbd2_journal_abort(journal, -EIO);
ac27a0ec 325 }
2b2d6d01 326 if (test_opt(sb, ERRORS_RO)) {
b31e1552 327 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 328 sb->s_flags |= MS_RDONLY;
329 }
e2d67052 330 ext4_commit_super(sb, 1);
ac27a0ec 331 if (test_opt(sb, ERRORS_PANIC))
617ba13b 332 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 333 sb->s_id);
334}
335
2b2d6d01
TT		 336void ext4_error(struct super_block *sb, const char *function,
337 const char *fmt, ...)
ac27a0ec
DK		 338{
339 va_list args;
340
341 va_start(args, fmt);
2b2d6d01 342 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 343 vprintk(fmt, args);
344 printk("\n");
345 va_end(args);
346
617ba13b 347 ext4_handle_error(sb);
ac27a0ec
DK		 348}
349
2b2d6d01 350static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 351 char nbuf[16])
352{
353 char *errstr = NULL;
354
355 switch (errno) {
356 case -EIO:
357 errstr = "IO failure";
358 break;
359 case -ENOMEM:
360 errstr = "Out of memory";
361 break;
362 case -EROFS:
78f1ddbb
TT		 363 if (!sb || (EXT4_SB(sb)->s_journal &&
364 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 365 errstr = "Journal has aborted";
366 else
367 errstr = "Readonly filesystem";
368 break;
369 default:
370 /* If the caller passed in an extra buffer for unknown
371 * errors, textualise them now. Else we just return
372 * NULL. */
373 if (nbuf) {
374 /* Check for truncated error codes... */
375 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
376 errstr = nbuf;
377 }
378 break;
379 }
380
381 return errstr;
382}
383
617ba13b 384/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 385 * automatically and invokes the appropriate error response. */
386
2b2d6d01 387void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 388{
389 char nbuf[16];
390 const char *errstr;
391
392 /* Special case: if the error is EROFS, and we're not already
393 * inside a transaction, then there's really no point in logging
394 * an error. */
395 if (errno == -EROFS && journal_current_handle() == NULL &&
396 (sb->s_flags & MS_RDONLY))
397 return;
398
617ba13b 399 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 400 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
401 sb->s_id, function, errstr);
ac27a0ec 402
617ba13b 403 ext4_handle_error(sb);
ac27a0ec
DK		 404}
405
406/*
617ba13b 407 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 408 * abort function may be used to deal with unrecoverable failures such
409 * as journal IO errors or ENOMEM at a critical moment in log management.
410 *
411 * We unconditionally force the filesystem into an ABORT|READONLY state,
412 * unless the error response on the fs has been set to panic in which
413 * case we take the easy way out and panic immediately.
414 */
415
2b2d6d01
TT		 416void ext4_abort(struct super_block *sb, const char *function,
417 const char *fmt, ...)
ac27a0ec
DK		 418{
419 va_list args;
420
ac27a0ec 421 va_start(args, fmt);
2b2d6d01 422 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 423 vprintk(fmt, args);
424 printk("\n");
425 va_end(args);
426
427 if (test_opt(sb, ERRORS_PANIC))
617ba13b 428 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 429
430 if (sb->s_flags & MS_RDONLY)
431 return;
432
b31e1552 433 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
617ba13b 434 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 435 sb->s_flags |= MS_RDONLY;
4ab2f15b 436 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ef2cabf7
HK		 437 if (EXT4_SB(sb)->s_journal)
438 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 439}
440
b31e1552
ES		 441void ext4_msg (struct super_block * sb, const char *prefix,
442 const char *fmt, ...)
443{
444 va_list args;
445
446 va_start(args, fmt);
447 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
448 vprintk(fmt, args);
449 printk("\n");
450 va_end(args);
451}
452
2b2d6d01
TT		 453void ext4_warning(struct super_block *sb, const char *function,
454 const char *fmt, ...)
ac27a0ec
DK		 455{
456 va_list args;
457
458 va_start(args, fmt);
617ba13b 459 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 460 sb->s_id, function);
461 vprintk(fmt, args);
462 printk("\n");
463 va_end(args);
464}
465
5d1b1b3f 466void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
0b8e58a1 467 const char *function, const char *fmt, ...)
5d1b1b3f
AK		 468__releases(bitlock)
469__acquires(bitlock)
470{
471 va_list args;
472 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
473
474 va_start(args, fmt);
475 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
476 vprintk(fmt, args);
477 printk("\n");
478 va_end(args);
479
480 if (test_opt(sb, ERRORS_CONT)) {
481 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
482 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 483 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 484 return;
485 }
486 ext4_unlock_group(sb, grp);
487 ext4_handle_error(sb);
488 /*
489 * We only get here in the ERRORS_RO case; relocking the group
490 * may be dangerous, but nothing bad will happen since the
491 * filesystem will have already been marked read/only and the
492 * journal has been aborted. We return 1 as a hint to callers
493 * who might what to use the return value from
494 * ext4_grp_locked_error() to distinguish beween the
495 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
496 * aggressively from the ext4 function in question, with a
497 * more appropriate error code.
498 */
499 ext4_lock_group(sb, grp);
500 return;
501}
502
617ba13b 503void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 504{
617ba13b 505 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 506
617ba13b 507 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 508 return;
509
46e665e9 510 ext4_warning(sb, __func__,
ac27a0ec
DK		 511 "updating to rev %d because of new feature flag, "
512 "running e2fsck is recommended",
617ba13b 513 EXT4_DYNAMIC_REV);
ac27a0ec 514
617ba13b
MC		 515 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
516 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
517 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 518 /* leave es->s_feature_*compat flags alone */
519 /* es->s_uuid will be set by e2fsck if empty */
520
521 /*
522 * The rest of the superblock fields should be zero, and if not it
523 * means they are likely already in use, so leave them alone. We
524 * can leave it up to e2fsck to clean up any inconsistencies there.
525 */
526}
527
528/*
529 * Open the external journal device
530 */
b31e1552 531static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 532{
533 struct block_device *bdev;
534 char b[BDEVNAME_SIZE];
535
536 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
537 if (IS_ERR(bdev))
538 goto fail;
539 return bdev;
540
541fail:
b31e1552 542 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 543 __bdevname(dev, b), PTR_ERR(bdev));
544 return NULL;
545}
546
547/*
548 * Release the journal device
549 */
617ba13b 550static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 551{
552 bd_release(bdev);
9a1c3542 553 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 554}
555
617ba13b 556static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 557{
558 struct block_device *bdev;
559 int ret = -ENODEV;
560
561 bdev = sbi->journal_bdev;
562 if (bdev) {
617ba13b 563 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 564 sbi->journal_bdev = NULL;
565 }
566 return ret;
567}
568
569static inline struct inode *orphan_list_entry(struct list_head *l)
570{
617ba13b 571 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 572}
573
617ba13b 574static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 575{
576 struct list_head *l;
577
b31e1552
ES		 578 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
579 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 580
581 printk(KERN_ERR "sb_info orphan list:\n");
582 list_for_each(l, &sbi->s_orphan) {
583 struct inode *inode = orphan_list_entry(l);
584 printk(KERN_ERR " "
585 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
586 inode->i_sb->s_id, inode->i_ino, inode,
587 inode->i_mode, inode->i_nlink,
588 NEXT_ORPHAN(inode));
589 }
590}
591
2b2d6d01 592static void ext4_put_super(struct super_block *sb)
ac27a0ec 593{
617ba13b
MC		 594 struct ext4_sb_info *sbi = EXT4_SB(sb);
595 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 596 int i, err;
ac27a0ec 597
4c0425ff
MC		 598 flush_workqueue(sbi->dio_unwritten_wq);
599 destroy_workqueue(sbi->dio_unwritten_wq);
600
a9e220f8 601 lock_super(sb);
6cfd0148 602 lock_kernel();
8c85e125 603 if (sb->s_dirt)
ebc1ac16 604 ext4_commit_super(sb, 1);
8c85e125 605
0390131b
FM		 606 if (sbi->s_journal) {
607 err = jbd2_journal_destroy(sbi->s_journal);
608 sbi->s_journal = NULL;
609 if (err < 0)
610 ext4_abort(sb, __func__,
611 "Couldn't clean up the journal");
612 }
d4edac31
JB		 613
614 ext4_release_system_zone(sb);
615 ext4_mb_release(sb);
616 ext4_ext_release(sb);
617 ext4_xattr_put_super(sb);
618
ac27a0ec 619 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 620 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 621 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 622 ext4_commit_super(sb, 1);
ac27a0ec 623 }
240799cd 624 if (sbi->s_proc) {
9f6200bb 625 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 626 }
3197ebdb 627 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 628
629 for (i = 0; i < sbi->s_gdb_count; i++)
630 brelse(sbi->s_group_desc[i]);
631 kfree(sbi->s_group_desc);
c5ca7c76
TT		 632 if (is_vmalloc_addr(sbi->s_flex_groups))
633 vfree(sbi->s_flex_groups);
634 else
635 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 636 percpu_counter_destroy(&sbi->s_freeblocks_counter);
637 percpu_counter_destroy(&sbi->s_freeinodes_counter);
638 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 639 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 640 brelse(sbi->s_sbh);
641#ifdef CONFIG_QUOTA
642 for (i = 0; i < MAXQUOTAS; i++)
643 kfree(sbi->s_qf_names[i]);
644#endif
645
646 /* Debugging code just in case the in-memory inode orphan list
647 * isn't empty. The on-disk one can be non-empty if we've
648 * detected an error and taken the fs readonly, but the
649 * in-memory list had better be clean by this point. */
650 if (!list_empty(&sbi->s_orphan))
651 dump_orphan_list(sb, sbi);
652 J_ASSERT(list_empty(&sbi->s_orphan));
653
f98393a6 654 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 655 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
656 /*
657 * Invalidate the journal device's buffers. We don't want them
658 * floating about in memory - the physical journal device may
659 * hotswapped, and it breaks the `ro-after' testing code.
660 */
661 sync_blockdev(sbi->journal_bdev);
f98393a6 662 invalidate_bdev(sbi->journal_bdev);
617ba13b 663 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 664 }
665 sb->s_fs_info = NULL;
3197ebdb
TT		 666 /*
667 * Now that we are completely done shutting down the
668 * superblock, we need to actually destroy the kobject.
669 */
670 unlock_kernel();
671 unlock_super(sb);
672 kobject_put(&sbi->s_kobj);
673 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 674 kfree(sbi->s_blockgroup_lock);
ac27a0ec 675 kfree(sbi);
ac27a0ec
DK		 676}
677
e18b890b 678static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 679
680/*
681 * Called inside transaction, so use GFP_NOFS
682 */
617ba13b 683static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 684{
617ba13b 685 struct ext4_inode_info *ei;
ac27a0ec 686
e6b4f8da 687 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 688 if (!ei)
689 return NULL;
0b8e58a1 690
ac27a0ec 691 ei->vfs_inode.i_version = 1;
91246c00 692 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 693 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 694 INIT_LIST_HEAD(&ei->i_prealloc_list);
695 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 696 /*
697 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
698 * therefore it can be null here. Don't check it, just initialize
699 * jinode.
700 */
678aaf48 701 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 702 ei->i_reserved_data_blocks = 0;
703 ei->i_reserved_meta_blocks = 0;
704 ei->i_allocated_meta_blocks = 0;
9d0be502 705 ei->i_da_metadata_calc_len = 0;
d2a17637
MC		 706 ei->i_delalloc_reserved_flag = 0;
707 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 708#ifdef CONFIG_QUOTA
709 ei->i_reserved_quota = 0;
710#endif
8d5d02e6
MC		 711 INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
712 ei->cur_aio_dio = NULL;
b436b9be
JK		 713 ei->i_sync_tid = 0;
714 ei->i_datasync_tid = 0;
0b8e58a1 715
ac27a0ec
DK		 716 return &ei->vfs_inode;
717}
718
617ba13b 719static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 720{
9f7dd93d 721 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 722 ext4_msg(inode->i_sb, KERN_ERR,
723 "Inode %lu (%p): orphan list check failed!",
724 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 725 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
726 EXT4_I(inode), sizeof(struct ext4_inode_info),
727 true);
728 dump_stack();
729 }
617ba13b 730 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 731}
732
51cc5068 733static void init_once(void *foo)
ac27a0ec 734{
617ba13b 735 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 736
a35afb83 737 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 738#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 739 init_rwsem(&ei->xattr_sem);
ac27a0ec 740#endif
0e855ac8 741 init_rwsem(&ei->i_data_sem);
a35afb83 742 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 743}
744
745static int init_inodecache(void)
746{
617ba13b
MC		 747 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
748 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 749 0, (SLAB_RECLAIM_ACCOUNT|
750 SLAB_MEM_SPREAD),
20c2df83 751 init_once);
617ba13b 752 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 753 return -ENOMEM;
754 return 0;
755}
756
757static void destroy_inodecache(void)
758{
617ba13b 759 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 760}
761
617ba13b 762static void ext4_clear_inode(struct inode *inode)
ac27a0ec 763{
257ba15c 764 vfs_dq_drop(inode);
c2ea3fde 765 ext4_discard_preallocations(inode);
0390131b
FM		 766 if (EXT4_JOURNAL(inode))
767 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 768 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 769}
770
2b2d6d01
TT		 771static inline void ext4_show_quota_options(struct seq_file *seq,
772 struct super_block *sb)
ac27a0ec
DK		 773{
774#if defined(CONFIG_QUOTA)
617ba13b 775 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 776
5a20bdfc
JK		 777 if (sbi->s_jquota_fmt) {
778 char *fmtname = "";
779
780 switch (sbi->s_jquota_fmt) {
781 case QFMT_VFS_OLD:
782 fmtname = "vfsold";
783 break;
784 case QFMT_VFS_V0:
785 fmtname = "vfsv0";
786 break;
787 case QFMT_VFS_V1:
788 fmtname = "vfsv1";
789 break;
790 }
791 seq_printf(seq, ",jqfmt=%s", fmtname);
792 }
ac27a0ec
DK		 793
794 if (sbi->s_qf_names[USRQUOTA])
795 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
796
797 if (sbi->s_qf_names[GRPQUOTA])
798 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
799
617ba13b 800 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 801 seq_puts(seq, ",usrquota");
802
617ba13b 803 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 804 seq_puts(seq, ",grpquota");
805#endif
806}
807
d9c9bef1
MS		 808/*
809 * Show an option if
810 * - it's set to a non-default value OR
811 * - if the per-sb default is different from the global default
812 */
617ba13b 813static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 814{
aa22df2c
AK		 815 int def_errors;
816 unsigned long def_mount_opts;
ac27a0ec 817 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 818 struct ext4_sb_info *sbi = EXT4_SB(sb);
819 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 820
821 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 822 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 823
824 if (sbi->s_sb_block != 1)
825 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
826 if (test_opt(sb, MINIX_DF))
827 seq_puts(seq, ",minixdf");
aa22df2c 828 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 829 seq_puts(seq, ",grpid");
830 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
831 seq_puts(seq, ",nogrpid");
832 if (sbi->s_resuid != EXT4_DEF_RESUID ||
833 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
834 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
835 }
836 if (sbi->s_resgid != EXT4_DEF_RESGID ||
837 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
838 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
839 }
bb4f397a 840 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 841 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 842 def_errors == EXT4_ERRORS_CONTINUE) {
843 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 844 }
845 }
aa22df2c 846 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 847 seq_puts(seq, ",errors=continue");
aa22df2c 848 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 849 seq_puts(seq, ",errors=panic");
aa22df2c 850 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 851 seq_puts(seq, ",nouid32");
aa22df2c 852 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 853 seq_puts(seq, ",debug");
854 if (test_opt(sb, OLDALLOC))
855 seq_puts(seq, ",oldalloc");
03010a33 856#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 857 if (test_opt(sb, XATTR_USER) &&
858 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 859 seq_puts(seq, ",user_xattr");
860 if (!test_opt(sb, XATTR_USER) &&
861 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
862 seq_puts(seq, ",nouser_xattr");
863 }
864#endif
03010a33 865#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 866 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 867 seq_puts(seq, ",acl");
868 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
869 seq_puts(seq, ",noacl");
870#endif
30773840 871 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 872 seq_printf(seq, ",commit=%u",
873 (unsigned) (sbi->s_commit_interval / HZ));
874 }
30773840
TT		 875 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
876 seq_printf(seq, ",min_batch_time=%u",
877 (unsigned) sbi->s_min_batch_time);
878 }
879 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
880 seq_printf(seq, ",max_batch_time=%u",
881 (unsigned) sbi->s_min_batch_time);
882 }
883
571640ca
ES		 884 /*
885 * We're changing the default of barrier mount option, so
886 * let's always display its mount state so it's clear what its
887 * status is.
888 */
889 seq_puts(seq, ",barrier=");
890 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 891 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
892 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 893 if (test_opt(sb, NOBH))
894 seq_puts(seq, ",nobh");
25ec56b5
JNC		 895 if (test_opt(sb, I_VERSION))
896 seq_puts(seq, ",i_version");
dd919b98
AK		 897 if (!test_opt(sb, DELALLOC))
898 seq_puts(seq, ",nodelalloc");
899
ac27a0ec 900
cb45bbe4
MS		 901 if (sbi->s_stripe)
902 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 903 /*
904 * journal mode get enabled in different ways
905 * So just print the value even if we didn't specify it
906 */
617ba13b 907 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 908 seq_puts(seq, ",data=journal");
617ba13b 909 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 910 seq_puts(seq, ",data=ordered");
617ba13b 911 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 912 seq_puts(seq, ",data=writeback");
913
240799cd
TT		 914 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
915 seq_printf(seq, ",inode_readahead_blks=%u",
916 sbi->s_inode_readahead_blks);
917
5bf5683a
HK		 918 if (test_opt(sb, DATA_ERR_ABORT))
919 seq_puts(seq, ",data_err=abort");
920
afd4672d 921 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 922 seq_puts(seq, ",noauto_da_alloc");
afd4672d 923
5328e635
ES		 924 if (test_opt(sb, DISCARD))
925 seq_puts(seq, ",discard");
926
e3bb52ae
ES		 927 if (test_opt(sb, NOLOAD))
928 seq_puts(seq, ",norecovery");
929
617ba13b 930 ext4_show_quota_options(seq, sb);
0b8e58a1 931
ac27a0ec
DK		 932 return 0;
933}
934
1b961ac0 935static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 936 u64 ino, u32 generation)
ac27a0ec 937{
ac27a0ec 938 struct inode *inode;
ac27a0ec 939
617ba13b 940 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 941 return ERR_PTR(-ESTALE);
617ba13b 942 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 943 return ERR_PTR(-ESTALE);
944
945 /* iget isn't really right if the inode is currently unallocated!!
946 *
617ba13b 947 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 948 * deleted, so we should be safe.
949 *
950 * Currently we don't know the generation for parent directory, so
951 * a generation of 0 means "accept any"
952 */
1d1fe1ee
DH		 953 inode = ext4_iget(sb, ino);
954 if (IS_ERR(inode))
955 return ERR_CAST(inode);
956 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 957 iput(inode);
958 return ERR_PTR(-ESTALE);
959 }
1b961ac0
CH		 960
961 return inode;
962}
963
964static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 965 int fh_len, int fh_type)
1b961ac0
CH		 966{
967 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
968 ext4_nfs_get_inode);
969}
970
971static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 972 int fh_len, int fh_type)
1b961ac0
CH		 973{
974 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
975 ext4_nfs_get_inode);
ac27a0ec
DK		 976}
977
c39a7f84
TO		 978/*
979 * Try to release metadata pages (indirect blocks, directories) which are
980 * mapped via the block device. Since these pages could have journal heads
981 * which would prevent try_to_free_buffers() from freeing them, we must use
982 * jbd2 layer's try_to_free_buffers() function to release them.
983 */
0b8e58a1
AD		 984static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
985 gfp_t wait)
c39a7f84
TO		 986{
987 journal_t *journal = EXT4_SB(sb)->s_journal;
988
989 WARN_ON(PageChecked(page));
990 if (!page_has_buffers(page))
991 return 0;
992 if (journal)
993 return jbd2_journal_try_to_free_buffers(journal, page,
994 wait & ~__GFP_WAIT);
995 return try_to_free_buffers(page);
996}
997
ac27a0ec 998#ifdef CONFIG_QUOTA
af5bc92d 999#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1000#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1001
617ba13b
MC		 1002static int ext4_write_dquot(struct dquot *dquot);
1003static int ext4_acquire_dquot(struct dquot *dquot);
1004static int ext4_release_dquot(struct dquot *dquot);
1005static int ext4_mark_dquot_dirty(struct dquot *dquot);
1006static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 1007static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1008 char *path, int remount);
617ba13b
MC		 1009static int ext4_quota_on_mount(struct super_block *sb, int type);
1010static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1011 size_t len, loff_t off);
617ba13b 1012static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1013 const char *data, size_t len, loff_t off);
1014
61e225dc 1015static const struct dquot_operations ext4_quota_operations = {
edf72453
JK		 1016 .initialize = dquot_initialize,
1017 .drop = dquot_drop,
a9e7f447 1018#ifdef CONFIG_QUOTA
60e58e0f 1019 .get_reserved_space = ext4_get_reserved_space,
a9e7f447 1020#endif
617ba13b
MC		 1021 .write_dquot = ext4_write_dquot,
1022 .acquire_dquot = ext4_acquire_dquot,
1023 .release_dquot = ext4_release_dquot,
1024 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1025 .write_info = ext4_write_info,
1026 .alloc_dquot = dquot_alloc,
1027 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1028};
1029
0d54b217 1030static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1031 .quota_on = ext4_quota_on,
ac27a0ec
DK		 1032 .quota_off = vfs_quota_off,
1033 .quota_sync = vfs_quota_sync,
1034 .get_info = vfs_get_dqinfo,
1035 .set_info = vfs_set_dqinfo,
1036 .get_dqblk = vfs_get_dqblk,
1037 .set_dqblk = vfs_set_dqblk
1038};
1039#endif
1040
ee9b6d61 1041static const struct super_operations ext4_sops = {
617ba13b
MC		 1042 .alloc_inode = ext4_alloc_inode,
1043 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1044 .write_inode = ext4_write_inode,
1045 .dirty_inode = ext4_dirty_inode,
1046 .delete_inode = ext4_delete_inode,
1047 .put_super = ext4_put_super,
617ba13b 1048 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1049 .freeze_fs = ext4_freeze,
1050 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1051 .statfs = ext4_statfs,
1052 .remount_fs = ext4_remount,
1053 .clear_inode = ext4_clear_inode,
1054 .show_options = ext4_show_options,
ac27a0ec 1055#ifdef CONFIG_QUOTA
617ba13b
MC		 1056 .quota_read = ext4_quota_read,
1057 .quota_write = ext4_quota_write,
ac27a0ec 1058#endif
c39a7f84 1059 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1060};
1061
9ca92389
TT		 1062static const struct super_operations ext4_nojournal_sops = {
1063 .alloc_inode = ext4_alloc_inode,
1064 .destroy_inode = ext4_destroy_inode,
1065 .write_inode = ext4_write_inode,
1066 .dirty_inode = ext4_dirty_inode,
1067 .delete_inode = ext4_delete_inode,
1068 .write_super = ext4_write_super,
1069 .put_super = ext4_put_super,
1070 .statfs = ext4_statfs,
1071 .remount_fs = ext4_remount,
1072 .clear_inode = ext4_clear_inode,
1073 .show_options = ext4_show_options,
1074#ifdef CONFIG_QUOTA
1075 .quota_read = ext4_quota_read,
1076 .quota_write = ext4_quota_write,
1077#endif
1078 .bdev_try_to_free_page = bdev_try_to_free_page,
1079};
1080
39655164 1081static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1082 .fh_to_dentry = ext4_fh_to_dentry,
1083 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1084 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1085};
1086
1087enum {
1088 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1089 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1090 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1091 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1092 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1093 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1094 Opt_journal_update, Opt_journal_dev,
818d276c 1095 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1096 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1097 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1098 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1099 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1100 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1101 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1102 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
6fd058f7 1103 Opt_block_validity, Opt_noblock_validity,
5328e635
ES		 1104 Opt_inode_readahead_blks, Opt_journal_ioprio,
1105 Opt_discard, Opt_nodiscard,
ac27a0ec
DK		 1106};
1107
a447c093 1108static const match_table_t tokens = {
ac27a0ec
DK		 1109 {Opt_bsd_df, "bsddf"},
1110 {Opt_minix_df, "minixdf"},
1111 {Opt_grpid, "grpid"},
1112 {Opt_grpid, "bsdgroups"},
1113 {Opt_nogrpid, "nogrpid"},
1114 {Opt_nogrpid, "sysvgroups"},
1115 {Opt_resgid, "resgid=%u"},
1116 {Opt_resuid, "resuid=%u"},
1117 {Opt_sb, "sb=%u"},
1118 {Opt_err_cont, "errors=continue"},
1119 {Opt_err_panic, "errors=panic"},
1120 {Opt_err_ro, "errors=remount-ro"},
1121 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1122 {Opt_debug, "debug"},
1123 {Opt_oldalloc, "oldalloc"},
1124 {Opt_orlov, "orlov"},
1125 {Opt_user_xattr, "user_xattr"},
1126 {Opt_nouser_xattr, "nouser_xattr"},
1127 {Opt_acl, "acl"},
1128 {Opt_noacl, "noacl"},
ac27a0ec 1129 {Opt_noload, "noload"},
e3bb52ae 1130 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1131 {Opt_nobh, "nobh"},
1132 {Opt_bh, "bh"},
1133 {Opt_commit, "commit=%u"},
30773840
TT		 1134 {Opt_min_batch_time, "min_batch_time=%u"},
1135 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1136 {Opt_journal_update, "journal=update"},
ac27a0ec 1137 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1138 {Opt_journal_checksum, "journal_checksum"},
1139 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1140 {Opt_abort, "abort"},
1141 {Opt_data_journal, "data=journal"},
1142 {Opt_data_ordered, "data=ordered"},
1143 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1144 {Opt_data_err_abort, "data_err=abort"},
1145 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1146 {Opt_offusrjquota, "usrjquota="},
1147 {Opt_usrjquota, "usrjquota=%s"},
1148 {Opt_offgrpjquota, "grpjquota="},
1149 {Opt_grpjquota, "grpjquota=%s"},
1150 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1151 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1152 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1153 {Opt_grpquota, "grpquota"},
1154 {Opt_noquota, "noquota"},
1155 {Opt_quota, "quota"},
1156 {Opt_usrquota, "usrquota"},
1157 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1158 {Opt_barrier, "barrier"},
1159 {Opt_nobarrier, "nobarrier"},
25ec56b5 1160 {Opt_i_version, "i_version"},
c9de560d 1161 {Opt_stripe, "stripe=%u"},
ac27a0ec 1162 {Opt_resize, "resize"},
64769240 1163 {Opt_delalloc, "delalloc"},
dd919b98 1164 {Opt_nodelalloc, "nodelalloc"},
6fd058f7
TT		 1165 {Opt_block_validity, "block_validity"},
1166 {Opt_noblock_validity, "noblock_validity"},
240799cd 1167 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1168 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1169 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1170 {Opt_auto_da_alloc, "auto_da_alloc"},
1171 {Opt_noauto_da_alloc, "noauto_da_alloc"},
5328e635
ES		 1172 {Opt_discard, "discard"},
1173 {Opt_nodiscard, "nodiscard"},
f3f12faa 1174 {Opt_err, NULL},
ac27a0ec
DK		 1175};
1176
617ba13b 1177static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1178{
617ba13b 1179 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1180 char *options = (char *) *data;
1181
1182 if (!options || strncmp(options, "sb=", 3) != 0)
1183 return 1; /* Default location */
0b8e58a1 1184
ac27a0ec 1185 options += 3;
0b8e58a1 1186 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1187 sb_block = simple_strtoul(options, &options, 0);
1188 if (*options && *options != ',') {
4776004f 1189 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1190 (char *) *data);
1191 return 1;
1192 }
1193 if (*options == ',')
1194 options++;
1195 *data = (void *) options;
0b8e58a1 1196
ac27a0ec
DK		 1197 return sb_block;
1198}
1199
b3881f74
TT		 1200#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1201
2b2d6d01 1202static int parse_options(char *options, struct super_block *sb,
c3191067 1203 unsigned long *journal_devnum,
b3881f74 1204 unsigned int *journal_ioprio,
2b2d6d01 1205 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1206{
617ba13b 1207 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1208 char *p;
ac27a0ec
DK		 1209 substring_t args[MAX_OPT_ARGS];
1210 int data_opt = 0;
1211 int option;
1212#ifdef CONFIG_QUOTA
dfc5d03f 1213 int qtype, qfmt;
ac27a0ec
DK		 1214 char *qname;
1215#endif
1216
1217 if (!options)
1218 return 1;
1219
2b2d6d01 1220 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1221 int token;
1222 if (!*p)
1223 continue;
1224
1225 token = match_token(p, tokens, args);
1226 switch (token) {
1227 case Opt_bsd_df:
2b2d6d01 1228 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1229 break;
1230 case Opt_minix_df:
2b2d6d01 1231 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1232 break;
1233 case Opt_grpid:
2b2d6d01 1234 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1235 break;
1236 case Opt_nogrpid:
2b2d6d01 1237 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1238 break;
1239 case Opt_resuid:
1240 if (match_int(&args[0], &option))
1241 return 0;
1242 sbi->s_resuid = option;
1243 break;
1244 case Opt_resgid:
1245 if (match_int(&args[0], &option))
1246 return 0;
1247 sbi->s_resgid = option;
1248 break;
1249 case Opt_sb:
1250 /* handled by get_sb_block() instead of here */
1251 /* *sb_block = match_int(&args[0]); */
1252 break;
1253 case Opt_err_panic:
2b2d6d01
TT		 1254 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1255 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1256 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1257 break;
1258 case Opt_err_ro:
2b2d6d01
TT		 1259 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1260 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1261 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1262 break;
1263 case Opt_err_cont:
2b2d6d01
TT		 1264 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1265 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1266 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1267 break;
1268 case Opt_nouid32:
2b2d6d01 1269 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1270 break;
ac27a0ec 1271 case Opt_debug:
2b2d6d01 1272 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1273 break;
1274 case Opt_oldalloc:
2b2d6d01 1275 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1276 break;
1277 case Opt_orlov:
2b2d6d01 1278 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1279 break;
03010a33 1280#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1281 case Opt_user_xattr:
2b2d6d01 1282 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1283 break;
1284 case Opt_nouser_xattr:
2b2d6d01 1285 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1286 break;
1287#else
1288 case Opt_user_xattr:
1289 case Opt_nouser_xattr:
b31e1552 1290 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1291 break;
1292#endif
03010a33 1293#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1294 case Opt_acl:
1295 set_opt(sbi->s_mount_opt, POSIX_ACL);
1296 break;
1297 case Opt_noacl:
1298 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1299 break;
1300#else
1301 case Opt_acl:
1302 case Opt_noacl:
b31e1552 1303 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1304 break;
1305#endif
ac27a0ec
DK		 1306 case Opt_journal_update:
1307 /* @@@ FIXME */
1308 /* Eventually we will want to be able to create
1309 a journal file here. For now, only allow the
1310 user to specify an existing inode to be the
1311 journal file. */
1312 if (is_remount) {
b31e1552
ES		 1313 ext4_msg(sb, KERN_ERR,
1314 "Cannot specify journal on remount");
ac27a0ec
DK		 1315 return 0;
1316 }
2b2d6d01 1317 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1318 break;
ac27a0ec
DK		 1319 case Opt_journal_dev:
1320 if (is_remount) {
b31e1552
ES		 1321 ext4_msg(sb, KERN_ERR,
1322 "Cannot specify journal on remount");
ac27a0ec
DK		 1323 return 0;
1324 }
1325 if (match_int(&args[0], &option))
1326 return 0;
1327 *journal_devnum = option;
1328 break;
818d276c 1329 case Opt_journal_checksum:
d4da6c9c
LT		 1330 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1331 break;
818d276c
GS		 1332 case Opt_journal_async_commit:
1333 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
d4da6c9c 1334 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
818d276c 1335 break;
ac27a0ec 1336 case Opt_noload:
2b2d6d01 1337 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1338 break;
1339 case Opt_commit:
1340 if (match_int(&args[0], &option))
1341 return 0;
1342 if (option < 0)
1343 return 0;
1344 if (option == 0)
cd02ff0b 1345 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1346 sbi->s_commit_interval = HZ * option;
1347 break;
30773840
TT		 1348 case Opt_max_batch_time:
1349 if (match_int(&args[0], &option))
1350 return 0;
1351 if (option < 0)
1352 return 0;
1353 if (option == 0)
1354 option = EXT4_DEF_MAX_BATCH_TIME;
1355 sbi->s_max_batch_time = option;
1356 break;
1357 case Opt_min_batch_time:
1358 if (match_int(&args[0], &option))
1359 return 0;
1360 if (option < 0)
1361 return 0;
1362 sbi->s_min_batch_time = option;
1363 break;
ac27a0ec 1364 case Opt_data_journal:
617ba13b 1365 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1366 goto datacheck;
1367 case Opt_data_ordered:
617ba13b 1368 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1369 goto datacheck;
1370 case Opt_data_writeback:
617ba13b 1371 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1372 datacheck:
1373 if (is_remount) {
617ba13b 1374 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec 1375 != data_opt) {
b31e1552
ES		 1376 ext4_msg(sb, KERN_ERR,
1377 "Cannot change data mode on remount");
ac27a0ec
DK		 1378 return 0;
1379 }
1380 } else {
617ba13b 1381 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1382 sbi->s_mount_opt |= data_opt;
1383 }
1384 break;
5bf5683a
HK		 1385 case Opt_data_err_abort:
1386 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1387 break;
1388 case Opt_data_err_ignore:
1389 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1390 break;
ac27a0ec
DK		 1391#ifdef CONFIG_QUOTA
1392 case Opt_usrjquota:
1393 qtype = USRQUOTA;
1394 goto set_qf_name;
1395 case Opt_grpjquota:
1396 qtype = GRPQUOTA;
1397set_qf_name:
17bd13b3 1398 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1399 !sbi->s_qf_names[qtype]) {
b31e1552
ES		 1400 ext4_msg(sb, KERN_ERR,
1401 "Cannot change journaled "
1402 "quota options when quota turned on");
ac27a0ec
DK		 1403 return 0;
1404 }
1405 qname = match_strdup(&args[0]);
1406 if (!qname) {
b31e1552
ES		 1407 ext4_msg(sb, KERN_ERR,
1408 "Not enough memory for "
1409 "storing quotafile name");
ac27a0ec
DK		 1410 return 0;
1411 }
1412 if (sbi->s_qf_names[qtype] &&
1413 strcmp(sbi->s_qf_names[qtype], qname)) {
b31e1552
ES		 1414 ext4_msg(sb, KERN_ERR,
1415 "%s quota file already "
1416 "specified", QTYPE2NAME(qtype));
ac27a0ec
DK		 1417 kfree(qname);
1418 return 0;
1419 }
1420 sbi->s_qf_names[qtype] = qname;
1421 if (strchr(sbi->s_qf_names[qtype], '/')) {
b31e1552
ES		 1422 ext4_msg(sb, KERN_ERR,
1423 "quotafile must be on "
1424 "filesystem root");
ac27a0ec
DK		 1425 kfree(sbi->s_qf_names[qtype]);
1426 sbi->s_qf_names[qtype] = NULL;
1427 return 0;
1428 }
1429 set_opt(sbi->s_mount_opt, QUOTA);
1430 break;
1431 case Opt_offusrjquota:
1432 qtype = USRQUOTA;
1433 goto clear_qf_name;
1434 case Opt_offgrpjquota:
1435 qtype = GRPQUOTA;
1436clear_qf_name:
17bd13b3 1437 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1438 sbi->s_qf_names[qtype]) {
b31e1552 1439 ext4_msg(sb, KERN_ERR, "Cannot change "
2c8be6b2 1440 "journaled quota options when "
b31e1552 1441 "quota turned on");
ac27a0ec
DK		 1442 return 0;
1443 }
1444 /*
1445 * The space will be released later when all options
1446 * are confirmed to be correct
1447 */
1448 sbi->s_qf_names[qtype] = NULL;
1449 break;
1450 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1451 qfmt = QFMT_VFS_OLD;
1452 goto set_qf_format;
ac27a0ec 1453 case Opt_jqfmt_vfsv0:
dfc5d03f 1454 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1455 goto set_qf_format;
1456 case Opt_jqfmt_vfsv1:
1457 qfmt = QFMT_VFS_V1;
dfc5d03f 1458set_qf_format:
17bd13b3 1459 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1460 sbi->s_jquota_fmt != qfmt) {
b31e1552 1461 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1462 "journaled quota options when "
b31e1552 1463 "quota turned on");
dfc5d03f
JK		 1464 return 0;
1465 }
1466 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1467 break;
1468 case Opt_quota:
1469 case Opt_usrquota:
1470 set_opt(sbi->s_mount_opt, QUOTA);
1471 set_opt(sbi->s_mount_opt, USRQUOTA);
1472 break;
1473 case Opt_grpquota:
1474 set_opt(sbi->s_mount_opt, QUOTA);
1475 set_opt(sbi->s_mount_opt, GRPQUOTA);
1476 break;
1477 case Opt_noquota:
17bd13b3 1478 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1479 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1480 "options when quota turned on");
ac27a0ec
DK		 1481 return 0;
1482 }
1483 clear_opt(sbi->s_mount_opt, QUOTA);
1484 clear_opt(sbi->s_mount_opt, USRQUOTA);
1485 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1486 break;
1487#else
1488 case Opt_quota:
1489 case Opt_usrquota:
1490 case Opt_grpquota:
b31e1552
ES		 1491 ext4_msg(sb, KERN_ERR,
1492 "quota options not supported");
cd59e7b9 1493 break;
ac27a0ec
DK		 1494 case Opt_usrjquota:
1495 case Opt_grpjquota:
1496 case Opt_offusrjquota:
1497 case Opt_offgrpjquota:
1498 case Opt_jqfmt_vfsold:
1499 case Opt_jqfmt_vfsv0:
5a20bdfc 1500 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1501 ext4_msg(sb, KERN_ERR,
1502 "journaled quota options not supported");
ac27a0ec
DK		 1503 break;
1504 case Opt_noquota:
1505 break;
1506#endif
1507 case Opt_abort:
4ab2f15b 1508 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1509 break;
06705bff
TT		 1510 case Opt_nobarrier:
1511 clear_opt(sbi->s_mount_opt, BARRIER);
1512 break;
ac27a0ec 1513 case Opt_barrier:
06705bff
TT		 1514 if (match_int(&args[0], &option)) {
1515 set_opt(sbi->s_mount_opt, BARRIER);
1516 break;
1517 }
ac27a0ec
DK		 1518 if (option)
1519 set_opt(sbi->s_mount_opt, BARRIER);
1520 else
1521 clear_opt(sbi->s_mount_opt, BARRIER);
1522 break;
1523 case Opt_ignore:
1524 break;
1525 case Opt_resize:
1526 if (!is_remount) {
b31e1552
ES		 1527 ext4_msg(sb, KERN_ERR,
1528 "resize option only available "
1529 "for remount");
ac27a0ec
DK		 1530 return 0;
1531 }
1532 if (match_int(&args[0], &option) != 0)
1533 return 0;
1534 *n_blocks_count = option;
1535 break;
1536 case Opt_nobh:
1537 set_opt(sbi->s_mount_opt, NOBH);
1538 break;
1539 case Opt_bh:
1540 clear_opt(sbi->s_mount_opt, NOBH);
1541 break;
25ec56b5
JNC		 1542 case Opt_i_version:
1543 set_opt(sbi->s_mount_opt, I_VERSION);
1544 sb->s_flags |= MS_I_VERSION;
1545 break;
dd919b98
AK		 1546 case Opt_nodelalloc:
1547 clear_opt(sbi->s_mount_opt, DELALLOC);
1548 break;
c9de560d
AT		 1549 case Opt_stripe:
1550 if (match_int(&args[0], &option))
1551 return 0;
1552 if (option < 0)
1553 return 0;
1554 sbi->s_stripe = option;
1555 break;
64769240
AT		 1556 case Opt_delalloc:
1557 set_opt(sbi->s_mount_opt, DELALLOC);
1558 break;
6fd058f7
TT		 1559 case Opt_block_validity:
1560 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1561 break;
1562 case Opt_noblock_validity:
1563 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1564 break;
240799cd
TT		 1565 case Opt_inode_readahead_blks:
1566 if (match_int(&args[0], &option))
1567 return 0;
1568 if (option < 0 || option > (1 << 30))
1569 return 0;
f7c43950 1570 if (!is_power_of_2(option)) {
b31e1552
ES		 1571 ext4_msg(sb, KERN_ERR,
1572 "EXT4-fs: inode_readahead_blks"
1573 " must be a power of 2");
3197ebdb
TT		 1574 return 0;
1575 }
240799cd
TT		 1576 sbi->s_inode_readahead_blks = option;
1577 break;
b3881f74
TT		 1578 case Opt_journal_ioprio:
1579 if (match_int(&args[0], &option))
1580 return 0;
1581 if (option < 0 || option > 7)
1582 break;
1583 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1584 option);
1585 break;
06705bff
TT		 1586 case Opt_noauto_da_alloc:
1587 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1588 break;
afd4672d 1589 case Opt_auto_da_alloc:
06705bff
TT		 1590 if (match_int(&args[0], &option)) {
1591 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1592 break;
1593 }
afd4672d
TT		 1594 if (option)
1595 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1596 else
1597 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1598 break;
5328e635
ES		 1599 case Opt_discard:
1600 set_opt(sbi->s_mount_opt, DISCARD);
1601 break;
1602 case Opt_nodiscard:
1603 clear_opt(sbi->s_mount_opt, DISCARD);
1604 break;
ac27a0ec 1605 default:
b31e1552
ES		 1606 ext4_msg(sb, KERN_ERR,
1607 "Unrecognized mount option \"%s\" "
1608 "or missing value", p);
ac27a0ec
DK		 1609 return 0;
1610 }
1611 }
1612#ifdef CONFIG_QUOTA
1613 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1614 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1615 sbi->s_qf_names[USRQUOTA])
1616 clear_opt(sbi->s_mount_opt, USRQUOTA);
1617
617ba13b 1618 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1619 sbi->s_qf_names[GRPQUOTA])
1620 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1621
1622 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1623 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1624 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b 1625 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
b31e1552
ES		 1626 ext4_msg(sb, KERN_ERR, "old and new quota "
1627 "format mixing");
ac27a0ec
DK		 1628 return 0;
1629 }
1630
1631 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1632 ext4_msg(sb, KERN_ERR, "journaled quota format "
1633 "not specified");
ac27a0ec
DK		 1634 return 0;
1635 }
1636 } else {
1637 if (sbi->s_jquota_fmt) {
b31e1552 1638 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1639 "specified with no journaling "
b31e1552 1640 "enabled");
ac27a0ec
DK		 1641 return 0;
1642 }
1643 }
1644#endif
1645 return 1;
1646}
1647
617ba13b 1648static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1649 int read_only)
1650{
617ba13b 1651 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1652 int res = 0;
1653
617ba13b 1654 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1655 ext4_msg(sb, KERN_ERR, "revision level too high, "
1656 "forcing read-only mode");
ac27a0ec
DK		 1657 res = MS_RDONLY;
1658 }
1659 if (read_only)
1660 return res;
617ba13b 1661 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1662 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1663 "running e2fsck is recommended");
617ba13b 1664 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1665 ext4_msg(sb, KERN_WARNING,
1666 "warning: mounting fs with errors, "
1667 "running e2fsck is recommended");
ac27a0ec
DK		 1668 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1669 le16_to_cpu(es->s_mnt_count) >=
1670 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1671 ext4_msg(sb, KERN_WARNING,
1672 "warning: maximal mount count reached, "
1673 "running e2fsck is recommended");
ac27a0ec
DK		 1674 else if (le32_to_cpu(es->s_checkinterval) &&
1675 (le32_to_cpu(es->s_lastcheck) +
1676 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1677 ext4_msg(sb, KERN_WARNING,
1678 "warning: checktime reached, "
1679 "running e2fsck is recommended");
0b8e58a1 1680 if (!sbi->s_journal)
0390131b 1681 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1682 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1683 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1684 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1685 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1686 ext4_update_dynamic_rev(sb);
0390131b
FM		 1687 if (sbi->s_journal)
1688 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1689
e2d67052 1690 ext4_commit_super(sb, 1);
ac27a0ec 1691 if (test_opt(sb, DEBUG))
a9df9a49 1692 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
7f4520cc 1693 "bpg=%lu, ipg=%lu, mo=%04x]\n",
ac27a0ec
DK		 1694 sb->s_blocksize,
1695 sbi->s_groups_count,
617ba13b
MC		 1696 EXT4_BLOCKS_PER_GROUP(sb),
1697 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1698 sbi->s_mount_opt);
1699
ac27a0ec
DK		 1700 return res;
1701}
1702
772cb7c8
JS		 1703static int ext4_fill_flex_info(struct super_block *sb)
1704{
1705 struct ext4_sb_info *sbi = EXT4_SB(sb);
1706 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1707 ext4_group_t flex_group_count;
1708 ext4_group_t flex_group;
1709 int groups_per_flex = 0;
c5ca7c76 1710 size_t size;
772cb7c8
JS		 1711 int i;
1712
503358ae
TT		 1713 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1714 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1715
1716 if (groups_per_flex < 2) {
772cb7c8
JS		 1717 sbi->s_log_groups_per_flex = 0;
1718 return 1;
1719 }
1720
c62a11fd
FB		 1721 /* We allocate both existing and potentially added groups */
1722 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1723 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1724 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1725 size = flex_group_count * sizeof(struct flex_groups);
1726 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1727 if (sbi->s_flex_groups == NULL) {
1728 sbi->s_flex_groups = vmalloc(size);
1729 if (sbi->s_flex_groups)
1730 memset(sbi->s_flex_groups, 0, size);
1731 }
772cb7c8 1732 if (sbi->s_flex_groups == NULL) {
b31e1552
ES		 1733 ext4_msg(sb, KERN_ERR, "not enough memory for "
1734 "%u flex groups", flex_group_count);
772cb7c8
JS		 1735 goto failed;
1736 }
772cb7c8 1737
772cb7c8 1738 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1739 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1740
1741 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1742 atomic_add(ext4_free_inodes_count(sb, gdp),
1743 &sbi->s_flex_groups[flex_group].free_inodes);
1744 atomic_add(ext4_free_blks_count(sb, gdp),
1745 &sbi->s_flex_groups[flex_group].free_blocks);
1746 atomic_add(ext4_used_dirs_count(sb, gdp),
1747 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1748 }
1749
1750 return 1;
1751failed:
1752 return 0;
1753}
1754
717d50e4
AD		 1755__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1756 struct ext4_group_desc *gdp)
1757{
1758 __u16 crc = 0;
1759
1760 if (sbi->s_es->s_feature_ro_compat &
1761 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1762 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1763 __le32 le_group = cpu_to_le32(block_group);
1764
1765 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1766 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1767 crc = crc16(crc, (__u8 *)gdp, offset);
1768 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1769 /* for checksum of struct ext4_group_desc do the rest...*/
1770 if ((sbi->s_es->s_feature_incompat &
1771 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1772 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1773 crc = crc16(crc, (__u8 *)gdp + offset,
1774 le16_to_cpu(sbi->s_es->s_desc_size) -
1775 offset);
1776 }
1777
1778 return cpu_to_le16(crc);
1779}
1780
1781int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1782 struct ext4_group_desc *gdp)
1783{
1784 if ((sbi->s_es->s_feature_ro_compat &
1785 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1786 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1787 return 0;
1788
1789 return 1;
1790}
1791
ac27a0ec 1792/* Called at mount-time, super-block is locked */
197cd65a 1793static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1794{
617ba13b
MC		 1795 struct ext4_sb_info *sbi = EXT4_SB(sb);
1796 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1797 ext4_fsblk_t last_block;
bd81d8ee
LV		 1798 ext4_fsblk_t block_bitmap;
1799 ext4_fsblk_t inode_bitmap;
1800 ext4_fsblk_t inode_table;
ce421581 1801 int flexbg_flag = 0;
fd2d4291 1802 ext4_group_t i;
ac27a0ec 1803
ce421581
JS		 1804 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1805 flexbg_flag = 1;
1806
af5bc92d 1807 ext4_debug("Checking group descriptors");
ac27a0ec 1808
197cd65a
AM		 1809 for (i = 0; i < sbi->s_groups_count; i++) {
1810 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1811
ce421581 1812 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1813 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1814 else
1815 last_block = first_block +
617ba13b 1816 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1817
8fadc143 1818 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1819 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1820 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1821 "Block bitmap for group %u not in group "
b31e1552 1822 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1823 return 0;
1824 }
8fadc143 1825 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1826 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1827 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1828 "Inode bitmap for group %u not in group "
b31e1552 1829 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1830 return 0;
1831 }
8fadc143 1832 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1833 if (inode_table < first_block ||
2b2d6d01 1834 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1835 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1836 "Inode table for group %u not in group "
b31e1552 1837 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1838 return 0;
1839 }
955ce5f5 1840 ext4_lock_group(sb, i);
717d50e4 1841 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1842 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1843 "Checksum for group %u failed (%u!=%u)",
1844 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1845 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1846 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1847 ext4_unlock_group(sb, i);
8a266467 1848 return 0;
7ee1ec4c 1849 }
717d50e4 1850 }
955ce5f5 1851 ext4_unlock_group(sb, i);
ce421581
JS		 1852 if (!flexbg_flag)
1853 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1854 }
1855
bd81d8ee 1856 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 1857 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1858 return 1;
1859}
1860
617ba13b 1861/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1862 * the superblock) which were deleted from all directories, but held open by
1863 * a process at the time of a crash. We walk the list and try to delete these
1864 * inodes at recovery time (only with a read-write filesystem).
1865 *
1866 * In order to keep the orphan inode chain consistent during traversal (in
1867 * case of crash during recovery), we link each inode into the superblock
1868 * orphan list_head and handle it the same way as an inode deletion during
1869 * normal operation (which journals the operations for us).
1870 *
1871 * We only do an iget() and an iput() on each inode, which is very safe if we
1872 * accidentally point at an in-use or already deleted inode. The worst that
1873 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1874 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1875 * e2fsck was run on this filesystem, and it must have already done the orphan
1876 * inode cleanup for us, so we can safely abort without any further action.
1877 */
2b2d6d01
TT		 1878static void ext4_orphan_cleanup(struct super_block *sb,
1879 struct ext4_super_block *es)
ac27a0ec
DK		 1880{
1881 unsigned int s_flags = sb->s_flags;
1882 int nr_orphans = 0, nr_truncates = 0;
1883#ifdef CONFIG_QUOTA
1884 int i;
1885#endif
1886 if (!es->s_last_orphan) {
1887 jbd_debug(4, "no orphan inodes to clean up\n");
1888 return;
1889 }
1890
a8f48a95 1891 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 1892 ext4_msg(sb, KERN_ERR, "write access "
1893 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 1894 return;
1895 }
1896
617ba13b 1897 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1898 if (es->s_last_orphan)
1899 jbd_debug(1, "Errors on filesystem, "
1900 "clearing orphan list.\n");
1901 es->s_last_orphan = 0;
1902 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1903 return;
1904 }
1905
1906 if (s_flags & MS_RDONLY) {
b31e1552 1907 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 1908 sb->s_flags &= ~MS_RDONLY;
1909 }
1910#ifdef CONFIG_QUOTA
1911 /* Needed for iput() to work correctly and not trash data */
1912 sb->s_flags |= MS_ACTIVE;
1913 /* Turn on quotas so that they are updated correctly */
1914 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1915 if (EXT4_SB(sb)->s_qf_names[i]) {
1916 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 1917 if (ret < 0)
b31e1552
ES		 1918 ext4_msg(sb, KERN_ERR,
1919 "Cannot turn on journaled "
1920 "quota: error %d", ret);
ac27a0ec
DK		 1921 }
1922 }
1923#endif
1924
1925 while (es->s_last_orphan) {
1926 struct inode *inode;
1927
97bd42b9
JB		 1928 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1929 if (IS_ERR(inode)) {
ac27a0ec
DK		 1930 es->s_last_orphan = 0;
1931 break;
1932 }
1933
617ba13b 1934 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
a269eb18 1935 vfs_dq_init(inode);
ac27a0ec 1936 if (inode->i_nlink) {
b31e1552
ES		 1937 ext4_msg(sb, KERN_DEBUG,
1938 "%s: truncating inode %lu to %lld bytes",
46e665e9 1939 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1940 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1941 inode->i_ino, inode->i_size);
617ba13b 1942 ext4_truncate(inode);
ac27a0ec
DK		 1943 nr_truncates++;
1944 } else {
b31e1552
ES		 1945 ext4_msg(sb, KERN_DEBUG,
1946 "%s: deleting unreferenced inode %lu",
46e665e9 1947 __func__, inode->i_ino);
ac27a0ec
DK		 1948 jbd_debug(2, "deleting unreferenced inode %lu\n",
1949 inode->i_ino);
1950 nr_orphans++;
1951 }
1952 iput(inode); /* The delete magic happens here! */
1953 }
1954
2b2d6d01 1955#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1956
1957 if (nr_orphans)
b31e1552
ES		 1958 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1959 PLURAL(nr_orphans));
ac27a0ec 1960 if (nr_truncates)
b31e1552
ES		 1961 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1962 PLURAL(nr_truncates));
ac27a0ec
DK		 1963#ifdef CONFIG_QUOTA
1964 /* Turn quotas off */
1965 for (i = 0; i < MAXQUOTAS; i++) {
1966 if (sb_dqopt(sb)->files[i])
6f28e087 1967 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1968 }
1969#endif
1970 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1971}
0b8e58a1 1972
cd2291a4
ES		 1973/*
1974 * Maximal extent format file size.
1975 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1976 * extent format containers, within a sector_t, and within i_blocks
1977 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1978 * so that won't be a limiting factor.
1979 *
1980 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1981 */
f287a1a5 1982static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1983{
1984 loff_t res;
1985 loff_t upper_limit = MAX_LFS_FILESIZE;
1986
1987 /* small i_blocks in vfs inode? */
f287a1a5 1988 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 1989 /*
90c699a9 1990 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 1991 * i_block represent total blocks in 512 bytes
1992 * 32 == size of vfs inode i_blocks * 8
1993 */
1994 upper_limit = (1LL << 32) - 1;
1995
1996 /* total blocks in file system block size */
1997 upper_limit >>= (blkbits - 9);
1998 upper_limit <<= blkbits;
1999 }
2000
2001 /* 32-bit extent-start container, ee_block */
2002 res = 1LL << 32;
2003 res <<= blkbits;
2004 res -= 1;
2005
2006 /* Sanity check against vm- & vfs- imposed limits */
2007 if (res > upper_limit)
2008 res = upper_limit;
2009
2010 return res;
2011}
ac27a0ec 2012
ac27a0ec 2013/*
cd2291a4 2014 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2015 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2016 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2017 */
f287a1a5 2018static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2019{
617ba13b 2020 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2021 int meta_blocks;
2022 loff_t upper_limit;
0b8e58a1
AD		 2023 /* This is calculated to be the largest file size for a dense, block
2024 * mapped file such that the file's total number of 512-byte sectors,
2025 * including data and all indirect blocks, does not exceed (2^48 - 1).
2026 *
2027 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2028 * number of 512-byte sectors of the file.
0fc1b451
AK		 2029 */
2030
f287a1a5 2031 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2032 /*
90c699a9 2033 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2034 * the inode i_block field represents total file blocks in
2035 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2036 */
2037 upper_limit = (1LL << 32) - 1;
2038
2039 /* total blocks in file system block size */
2040 upper_limit >>= (bits - 9);
2041
2042 } else {
8180a562
AK		 2043 /*
2044 * We use 48 bit ext4_inode i_blocks
2045 * With EXT4_HUGE_FILE_FL set the i_blocks
2046 * represent total number of blocks in
2047 * file system block size
2048 */
0fc1b451
AK		 2049 upper_limit = (1LL << 48) - 1;
2050
0fc1b451
AK		 2051 }
2052
2053 /* indirect blocks */
2054 meta_blocks = 1;
2055 /* double indirect blocks */
2056 meta_blocks += 1 + (1LL << (bits-2));
2057 /* tripple indirect blocks */
2058 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2059
2060 upper_limit -= meta_blocks;
2061 upper_limit <<= bits;
ac27a0ec
DK		 2062
2063 res += 1LL << (bits-2);
2064 res += 1LL << (2*(bits-2));
2065 res += 1LL << (3*(bits-2));
2066 res <<= bits;
2067 if (res > upper_limit)
2068 res = upper_limit;
0fc1b451
AK		 2069
2070 if (res > MAX_LFS_FILESIZE)
2071 res = MAX_LFS_FILESIZE;
2072
ac27a0ec
DK		 2073 return res;
2074}
2075
617ba13b 2076static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2077 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2078{
617ba13b 2079 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2080 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2081 int has_super = 0;
2082
2083 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2084
617ba13b 2085 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2086 nr < first_meta_bg)
70bbb3e0 2087 return logical_sb_block + nr + 1;
ac27a0ec 2088 bg = sbi->s_desc_per_block * nr;
617ba13b 2089 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2090 has_super = 1;
0b8e58a1 2091
617ba13b 2092 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2093}
2094
c9de560d
AT		 2095/**
2096 * ext4_get_stripe_size: Get the stripe size.
2097 * @sbi: In memory super block info
2098 *
2099 * If we have specified it via mount option, then
2100 * use the mount option value. If the value specified at mount time is
2101 * greater than the blocks per group use the super block value.
2102 * If the super block value is greater than blocks per group return 0.
2103 * Allocator needs it be less than blocks per group.
2104 *
2105 */
2106static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2107{
2108 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2109 unsigned long stripe_width =
2110 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2111
2112 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2113 return sbi->s_stripe;
2114
2115 if (stripe_width <= sbi->s_blocks_per_group)
2116 return stripe_width;
2117
2118 if (stride <= sbi->s_blocks_per_group)
2119 return stride;
2120
2121 return 0;
2122}
ac27a0ec 2123
3197ebdb
TT		 2124/* sysfs supprt */
2125
2126struct ext4_attr {
2127 struct attribute attr;
2128 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2129 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2130 const char *, size_t);
2131 int offset;
2132};
2133
2134static int parse_strtoul(const char *buf,
2135 unsigned long max, unsigned long *value)
2136{
2137 char *endp;
2138
e7d2860b
AGR		 2139 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2140 endp = skip_spaces(endp);
3197ebdb
TT		 2141 if (*endp || *value > max)
2142 return -EINVAL;
2143
2144 return 0;
2145}
2146
2147static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2148 struct ext4_sb_info *sbi,
2149 char *buf)
2150{
2151 return snprintf(buf, PAGE_SIZE, "%llu\n",
2152 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2153}
2154
2155static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2156 struct ext4_sb_info *sbi, char *buf)
2157{
2158 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2159
2160 return snprintf(buf, PAGE_SIZE, "%lu\n",
2161 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2162 sbi->s_sectors_written_start) >> 1);
2163}
2164
2165static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2166 struct ext4_sb_info *sbi, char *buf)
2167{
2168 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2169
2170 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2171 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2172 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2173 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2174}
2175
2176static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2177 struct ext4_sb_info *sbi,
2178 const char *buf, size_t count)
2179{
2180 unsigned long t;
2181
2182 if (parse_strtoul(buf, 0x40000000, &t))
2183 return -EINVAL;
2184
f7c43950 2185 if (!is_power_of_2(t))
3197ebdb
TT		 2186 return -EINVAL;
2187
2188 sbi->s_inode_readahead_blks = t;
2189 return count;
2190}
2191
2192static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2193 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2194{
2195 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2196
2197 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2198}
2199
2200static ssize_t sbi_ui_store(struct ext4_attr *a,
2201 struct ext4_sb_info *sbi,
2202 const char *buf, size_t count)
2203{
2204 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2205 unsigned long t;
2206
2207 if (parse_strtoul(buf, 0xffffffff, &t))
2208 return -EINVAL;
2209 *ui = t;
2210 return count;
2211}
2212
2213#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2214static struct ext4_attr ext4_attr_##_name = { \
2215 .attr = {.name = __stringify(_name), .mode = _mode }, \
2216 .show = _show, \
2217 .store = _store, \
2218 .offset = offsetof(struct ext4_sb_info, _elname), \
2219}
2220#define EXT4_ATTR(name, mode, show, store) \
2221static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2222
2223#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2224#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2225#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2226 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2227#define ATTR_LIST(name) &ext4_attr_##name.attr
2228
2229EXT4_RO_ATTR(delayed_allocation_blocks);
2230EXT4_RO_ATTR(session_write_kbytes);
2231EXT4_RO_ATTR(lifetime_write_kbytes);
2232EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2233 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2234EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2235EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2236EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2237EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2238EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2239EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2240EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2241EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2242
2243static struct attribute *ext4_attrs[] = {
2244 ATTR_LIST(delayed_allocation_blocks),
2245 ATTR_LIST(session_write_kbytes),
2246 ATTR_LIST(lifetime_write_kbytes),
2247 ATTR_LIST(inode_readahead_blks),
11013911 2248 ATTR_LIST(inode_goal),
3197ebdb
TT		 2249 ATTR_LIST(mb_stats),
2250 ATTR_LIST(mb_max_to_scan),
2251 ATTR_LIST(mb_min_to_scan),
2252 ATTR_LIST(mb_order2_req),
2253 ATTR_LIST(mb_stream_req),
2254 ATTR_LIST(mb_group_prealloc),
55138e0b 2255 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2256 NULL,
2257};
2258
2259static ssize_t ext4_attr_show(struct kobject *kobj,
2260 struct attribute *attr, char *buf)
2261{
2262 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2263 s_kobj);
2264 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2265
2266 return a->show ? a->show(a, sbi, buf) : 0;
2267}
2268
2269static ssize_t ext4_attr_store(struct kobject *kobj,
2270 struct attribute *attr,
2271 const char *buf, size_t len)
2272{
2273 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2274 s_kobj);
2275 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2276
2277 return a->store ? a->store(a, sbi, buf, len) : 0;
2278}
2279
2280static void ext4_sb_release(struct kobject *kobj)
2281{
2282 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2283 s_kobj);
2284 complete(&sbi->s_kobj_unregister);
2285}
2286
2287
2288static struct sysfs_ops ext4_attr_ops = {
2289 .show = ext4_attr_show,
2290 .store = ext4_attr_store,
2291};
2292
2293static struct kobj_type ext4_ktype = {
2294 .default_attrs = ext4_attrs,
2295 .sysfs_ops = &ext4_attr_ops,
2296 .release = ext4_sb_release,
2297};
2298
a13fb1a4
ES		 2299/*
2300 * Check whether this filesystem can be mounted based on
2301 * the features present and the RDONLY/RDWR mount requested.
2302 * Returns 1 if this filesystem can be mounted as requested,
2303 * 0 if it cannot be.
2304 */
2305static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2306{
2307 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2308 ext4_msg(sb, KERN_ERR,
2309 "Couldn't mount because of "
2310 "unsupported optional features (%x)",
2311 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2312 ~EXT4_FEATURE_INCOMPAT_SUPP));
2313 return 0;
2314 }
2315
2316 if (readonly)
2317 return 1;
2318
2319 /* Check that feature set is OK for a read-write mount */
2320 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2321 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2322 "unsupported optional features (%x)",
2323 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2324 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2325 return 0;
2326 }
2327 /*
2328 * Large file size enabled file system can only be mounted
2329 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2330 */
2331 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2332 if (sizeof(blkcnt_t) < sizeof(u64)) {
2333 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2334 "cannot be mounted RDWR without "
2335 "CONFIG_LBDAF");
2336 return 0;
2337 }
2338 }
2339 return 1;
2340}
2341
2b2d6d01 2342static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2343 __releases(kernel_lock)
2344 __acquires(kernel_lock)
ac27a0ec 2345{
2b2d6d01 2346 struct buffer_head *bh;
617ba13b
MC		 2347 struct ext4_super_block *es = NULL;
2348 struct ext4_sb_info *sbi;
2349 ext4_fsblk_t block;
2350 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2351 ext4_fsblk_t logical_sb_block;
ac27a0ec 2352 unsigned long offset = 0;
ac27a0ec
DK		 2353 unsigned long journal_devnum = 0;
2354 unsigned long def_mount_opts;
2355 struct inode *root;
9f6200bb 2356 char *cp;
0390131b 2357 const char *descr;
1d1fe1ee 2358 int ret = -EINVAL;
ac27a0ec 2359 int blocksize;
4ec11028
TT		 2360 unsigned int db_count;
2361 unsigned int i;
f287a1a5 2362 int needs_recovery, has_huge_files;
bd81d8ee 2363 __u64 blocks_count;
833f4077 2364 int err;
b3881f74 2365 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2366
2367 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2368 if (!sbi)
2369 return -ENOMEM;
705895b6
PE		 2370
2371 sbi->s_blockgroup_lock =
2372 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2373 if (!sbi->s_blockgroup_lock) {
2374 kfree(sbi);
2375 return -ENOMEM;
2376 }
ac27a0ec
DK		 2377 sb->s_fs_info = sbi;
2378 sbi->s_mount_opt = 0;
617ba13b
MC		 2379 sbi->s_resuid = EXT4_DEF_RESUID;
2380 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2381 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2382 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2383 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2384 sectors[1]);
ac27a0ec
DK		 2385
2386 unlock_kernel();
2387
9f6200bb
TT		 2388 /* Cleanup superblock name */
2389 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2390 *cp = '!';
2391
617ba13b 2392 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2393 if (!blocksize) {
b31e1552 2394 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2395 goto out_fail;
2396 }
2397
2398 /*
617ba13b 2399 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2400 * block sizes. We need to calculate the offset from buffer start.
2401 */
617ba13b 2402 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2403 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2404 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2405 } else {
70bbb3e0 2406 logical_sb_block = sb_block;
ac27a0ec
DK		 2407 }
2408
70bbb3e0 2409 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 2410 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 2411 goto out_fail;
2412 }
2413 /*
2414 * Note: s_es must be initialized as soon as possible because
617ba13b 2415 * some ext4 macro-instructions depend on its value
ac27a0ec 2416 */
617ba13b 2417 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2418 sbi->s_es = es;
2419 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2420 if (sb->s_magic != EXT4_SUPER_MAGIC)
2421 goto cantfind_ext4;
afc32f7e 2422 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2423
2424 /* Set defaults before we parse the mount options */
2425 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2426 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2427 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2428 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2429 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2430 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2431 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2432#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2433 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2434 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2435#endif
03010a33 2436#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2437 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2438 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2439#endif
617ba13b
MC		 2440 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2441 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2442 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2443 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2444 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2445 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2446
2447 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2448 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2449 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2450 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2451 else
2452 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2453
2454 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2455 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2456 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2457 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2458 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2459
571640ca 2460 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2461
dd919b98
AK		 2462 /*
2463 * enable delayed allocation by default
2464 * Use -o nodelalloc to turn it off
2465 */
2466 set_opt(sbi->s_mount_opt, DELALLOC);
2467
b3881f74
TT		 2468 if (!parse_options((char *) data, sb, &journal_devnum,
2469 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2470 goto failed_mount;
2471
2472 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2473 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2474
617ba13b
MC		 2475 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2476 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2477 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2478 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 2479 ext4_msg(sb, KERN_WARNING,
2480 "feature flags set on rev 0 fs, "
2481 "running e2fsck is recommended");
469108ff 2482
ac27a0ec
DK		 2483 /*
2484 * Check feature flags regardless of the revision level, since we
2485 * previously didn't change the revision level when setting the flags,
2486 * so there is a chance incompat flags are set on a rev 0 filesystem.
2487 */
a13fb1a4 2488 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 2489 goto failed_mount;
a13fb1a4 2490
ac27a0ec
DK		 2491 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2492
617ba13b
MC		 2493 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2494 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 2495 ext4_msg(sb, KERN_ERR,
2496 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 2497 goto failed_mount;
2498 }
2499
ac27a0ec 2500 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2501 /* Validate the filesystem blocksize */
2502 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 2503 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 2504 blocksize);
ac27a0ec
DK		 2505 goto failed_mount;
2506 }
2507
2b2d6d01 2508 brelse(bh);
70bbb3e0
AM		 2509 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2510 offset = do_div(logical_sb_block, blocksize);
2511 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 2512 if (!bh) {
b31e1552
ES		 2513 ext4_msg(sb, KERN_ERR,
2514 "Can't read superblock on 2nd try");
ac27a0ec
DK		 2515 goto failed_mount;
2516 }
617ba13b 2517 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2518 sbi->s_es = es;
617ba13b 2519 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 2520 ext4_msg(sb, KERN_ERR,
2521 "Magic mismatch, very weird!");
ac27a0ec
DK		 2522 goto failed_mount;
2523 }
2524 }
2525
a13fb1a4
ES		 2526 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2527 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 2528 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2529 has_huge_files);
2530 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2531
617ba13b
MC		 2532 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2533 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2534 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2535 } else {
2536 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2537 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2538 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2539 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2540 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 2541 ext4_msg(sb, KERN_ERR,
2542 "unsupported inode size: %d",
2b2d6d01 2543 sbi->s_inode_size);
ac27a0ec
DK		 2544 goto failed_mount;
2545 }
ef7f3835
KS		 2546 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2547 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2548 }
0b8e58a1 2549
0d1ee42f
AR		 2550 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2551 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2552 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2553 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2554 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 2555 ext4_msg(sb, KERN_ERR,
2556 "unsupported descriptor size %lu",
0d1ee42f
AR		 2557 sbi->s_desc_size);
2558 goto failed_mount;
2559 }
2560 } else
2561 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 2562
ac27a0ec 2563 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2564 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2565 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 2566 goto cantfind_ext4;
0b8e58a1 2567
617ba13b 2568 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2569 if (sbi->s_inodes_per_block == 0)
617ba13b 2570 goto cantfind_ext4;
ac27a0ec
DK		 2571 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2572 sbi->s_inodes_per_block;
0d1ee42f 2573 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2574 sbi->s_sbh = bh;
2575 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2576 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2577 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 2578
2b2d6d01 2579 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2580 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2581 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2582 i = le32_to_cpu(es->s_flags);
2583 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2584 sbi->s_hash_unsigned = 3;
2585 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2586#ifdef __CHAR_UNSIGNED__
2587 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2588 sbi->s_hash_unsigned = 3;
2589#else
2590 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2591#endif
2592 sb->s_dirt = 1;
2593 }
ac27a0ec
DK		 2594
2595 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 2596 ext4_msg(sb, KERN_ERR,
2597 "#blocks per group too big: %lu",
2b2d6d01 2598 sbi->s_blocks_per_group);
ac27a0ec
DK		 2599 goto failed_mount;
2600 }
ac27a0ec 2601 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 2602 ext4_msg(sb, KERN_ERR,
2603 "#inodes per group too big: %lu",
2b2d6d01 2604 sbi->s_inodes_per_group);
ac27a0ec
DK		 2605 goto failed_mount;
2606 }
2607
bf43d84b
ES		 2608 /*
2609 * Test whether we have more sectors than will fit in sector_t,
2610 * and whether the max offset is addressable by the page cache.
2611 */
2612 if ((ext4_blocks_count(es) >
2613 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2614 (ext4_blocks_count(es) >
2615 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
b31e1552 2616 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 2617 " too large to mount safely on this system");
ac27a0ec 2618 if (sizeof(sector_t) < 8)
90c699a9 2619 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
bf43d84b 2620 ret = -EFBIG;
ac27a0ec
DK		 2621 goto failed_mount;
2622 }
2623
617ba13b
MC		 2624 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2625 goto cantfind_ext4;
e7c95593 2626
0f2ddca6
FTN		 2627 /* check blocks count against device size */
2628 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2629 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 2630 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2631 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 2632 ext4_blocks_count(es), blocks_count);
2633 goto failed_mount;
2634 }
2635
0b8e58a1
AD		 2636 /*
2637 * It makes no sense for the first data block to be beyond the end
2638 * of the filesystem.
2639 */
2640 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 2641 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2642 "block %u is beyond end of filesystem (%llu)",
2643 le32_to_cpu(es->s_first_data_block),
2644 ext4_blocks_count(es));
e7c95593
ES		 2645 goto failed_mount;
2646 }
bd81d8ee
LV		 2647 blocks_count = (ext4_blocks_count(es) -
2648 le32_to_cpu(es->s_first_data_block) +
2649 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2650 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 2651 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 2652 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 2653 "(block count %llu, first data block %u, "
b31e1552 2654 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 2655 ext4_blocks_count(es),
2656 le32_to_cpu(es->s_first_data_block),
2657 EXT4_BLOCKS_PER_GROUP(sb));
2658 goto failed_mount;
2659 }
bd81d8ee 2660 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 2661 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2662 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 2663 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2664 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2665 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2666 GFP_KERNEL);
2667 if (sbi->s_group_desc == NULL) {
b31e1552 2668 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 2669 goto failed_mount;
2670 }
2671
3244fcb1 2672#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2673 if (ext4_proc_root)
2674 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2675#endif
240799cd 2676
705895b6 2677 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2678
2679 for (i = 0; i < db_count; i++) {
70bbb3e0 2680 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2681 sbi->s_group_desc[i] = sb_bread(sb, block);
2682 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 2683 ext4_msg(sb, KERN_ERR,
2684 "can't read group descriptor %d", i);
ac27a0ec
DK		 2685 db_count = i;
2686 goto failed_mount2;
2687 }
2688 }
2b2d6d01 2689 if (!ext4_check_descriptors(sb)) {
b31e1552 2690 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 2691 goto failed_mount2;
2692 }
772cb7c8
JS		 2693 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2694 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 2695 ext4_msg(sb, KERN_ERR,
2696 "unable to initialize "
2697 "flex_bg meta info!");
772cb7c8
JS		 2698 goto failed_mount2;
2699 }
2700
ac27a0ec
DK		 2701 sbi->s_gdb_count = db_count;
2702 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2703 spin_lock_init(&sbi->s_next_gen_lock);
2704
833f4077
PZ		 2705 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2706 ext4_count_free_blocks(sb));
2707 if (!err) {
2708 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2709 ext4_count_free_inodes(sb));
2710 }
2711 if (!err) {
2712 err = percpu_counter_init(&sbi->s_dirs_counter,
2713 ext4_count_dirs(sb));
2714 }
6bc6e63f
AK		 2715 if (!err) {
2716 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2717 }
833f4077 2718 if (err) {
b31e1552 2719 ext4_msg(sb, KERN_ERR, "insufficient memory");
833f4077
PZ		 2720 goto failed_mount3;
2721 }
ac27a0ec 2722
c9de560d 2723 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 2724 sbi->s_max_writeback_mb_bump = 128;
c9de560d 2725
ac27a0ec
DK		 2726 /*
2727 * set up enough so that it can read an inode
2728 */
9ca92389
TT		 2729 if (!test_opt(sb, NOLOAD) &&
2730 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2731 sb->s_op = &ext4_sops;
2732 else
2733 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2734 sb->s_export_op = &ext4_export_ops;
2735 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2736#ifdef CONFIG_QUOTA
617ba13b
MC		 2737 sb->s_qcop = &ext4_qctl_operations;
2738 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2739#endif
2740 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2741 mutex_init(&sbi->s_orphan_lock);
32ed5058 2742 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2743
2744 sb->s_root = NULL;
2745
2746 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2747 EXT4_HAS_INCOMPAT_FEATURE(sb,
2748 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2749
2750 /*
2751 * The first inode we look at is the journal inode. Don't try
2752 * root first: it may be modified in the journal!
2753 */
2754 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2755 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2756 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2757 goto failed_mount3;
0390131b
FM		 2758 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2759 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 2760 ext4_msg(sb, KERN_ERR, "required journal recovery "
2761 "suppressed and not mounted read-only");
0390131b 2762 goto failed_mount4;
ac27a0ec 2763 } else {
0390131b
FM		 2764 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2765 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2766 sbi->s_journal = NULL;
2767 needs_recovery = 0;
2768 goto no_journal;
ac27a0ec
DK		 2769 }
2770
eb40a09c
JS		 2771 if (ext4_blocks_count(es) > 0xffffffffULL &&
2772 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2773 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 2774 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
eb40a09c
JS		 2775 goto failed_mount4;
2776 }
2777
d4da6c9c
LT		 2778 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2779 jbd2_journal_set_features(sbi->s_journal,
2780 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 2781 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2782 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2783 jbd2_journal_set_features(sbi->s_journal,
2784 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 2785 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2786 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2787 } else {
2788 jbd2_journal_clear_features(sbi->s_journal,
2789 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2790 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2791 }
818d276c 2792
ac27a0ec
DK		 2793 /* We have now updated the journal if required, so we can
2794 * validate the data journaling mode. */
2795 switch (test_opt(sb, DATA_FLAGS)) {
2796 case 0:
2797 /* No mode set, assume a default based on the journal
63f57933
AM		 2798 * capabilities: ORDERED_DATA if the journal can
2799 * cope, else JOURNAL_DATA
2800 */
dab291af
MC		 2801 if (jbd2_journal_check_available_features
2802 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2803 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2804 else
2805 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2806 break;
2807
617ba13b
MC		 2808 case EXT4_MOUNT_ORDERED_DATA:
2809 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2810 if (!jbd2_journal_check_available_features
2811 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 2812 ext4_msg(sb, KERN_ERR, "Journal does not support "
2813 "requested data journaling mode");
ac27a0ec
DK		 2814 goto failed_mount4;
2815 }
2816 default:
2817 break;
2818 }
b3881f74 2819 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2820
0390131b 2821no_journal:
ac27a0ec
DK		 2822
2823 if (test_opt(sb, NOBH)) {
617ba13b 2824 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
b31e1552
ES		 2825 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2826 "its supported only with writeback mode");
ac27a0ec
DK		 2827 clear_opt(sbi->s_mount_opt, NOBH);
2828 }
2829 }
4c0425ff
MC		 2830 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2831 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2832 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2833 goto failed_mount_wq;
2834 }
2835
ac27a0ec 2836 /*
dab291af 2837 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2838 * so we can safely mount the rest of the filesystem now.
2839 */
2840
1d1fe1ee
DH		 2841 root = ext4_iget(sb, EXT4_ROOT_INO);
2842 if (IS_ERR(root)) {
b31e1552 2843 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 2844 ret = PTR_ERR(root);
ac27a0ec
DK		 2845 goto failed_mount4;
2846 }
2847 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2848 iput(root);
b31e1552 2849 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 2850 goto failed_mount4;
2851 }
1d1fe1ee
DH		 2852 sb->s_root = d_alloc_root(root);
2853 if (!sb->s_root) {
b31e1552 2854 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 2855 iput(root);
2856 ret = -ENOMEM;
2857 goto failed_mount4;
2858 }
ac27a0ec 2859
2b2d6d01 2860 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2861
2862 /* determine the minimum size of new large inodes, if present */
2863 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2864 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2865 EXT4_GOOD_OLD_INODE_SIZE;
2866 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2867 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2868 if (sbi->s_want_extra_isize <
2869 le16_to_cpu(es->s_want_extra_isize))
2870 sbi->s_want_extra_isize =
2871 le16_to_cpu(es->s_want_extra_isize);
2872 if (sbi->s_want_extra_isize <
2873 le16_to_cpu(es->s_min_extra_isize))
2874 sbi->s_want_extra_isize =
2875 le16_to_cpu(es->s_min_extra_isize);
2876 }
2877 }
2878 /* Check if enough inode space is available */
2879 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2880 sbi->s_inode_size) {
2881 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2882 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 2883 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2884 "available");
ef7f3835
KS		 2885 }
2886
90576c0b
TT		 2887 if (test_opt(sb, DELALLOC) &&
2888 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 2889 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2890 "requested data journaling mode");
c2774d84 2891 clear_opt(sbi->s_mount_opt, DELALLOC);
90576c0b 2892 }
c2774d84 2893
6fd058f7
TT		 2894 err = ext4_setup_system_zone(sb);
2895 if (err) {
b31e1552
ES		 2896 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2897 "zone (%d)\n", err);
6fd058f7
TT		 2898 goto failed_mount4;
2899 }
2900
c2774d84
AK		 2901 ext4_ext_init(sb);
2902 err = ext4_mb_init(sb, needs_recovery);
2903 if (err) {
b31e1552
ES		 2904 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2905 err);
c2774d84
AK		 2906 goto failed_mount4;
2907 }
2908
3197ebdb
TT		 2909 sbi->s_kobj.kset = ext4_kset;
2910 init_completion(&sbi->s_kobj_unregister);
2911 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2912 "%s", sb->s_id);
2913 if (err) {
2914 ext4_mb_release(sb);
2915 ext4_ext_release(sb);
2916 goto failed_mount4;
2917 };
2918
617ba13b
MC		 2919 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2920 ext4_orphan_cleanup(sb, es);
2921 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2922 if (needs_recovery) {
b31e1552 2923 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 2924 ext4_mark_recovery_complete(sb, es);
2925 }
2926 if (EXT4_SB(sb)->s_journal) {
2927 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2928 descr = " journalled data mode";
2929 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2930 descr = " ordered data mode";
2931 else
2932 descr = " writeback data mode";
2933 } else
2934 descr = "out journal";
2935
b31e1552 2936 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
ac27a0ec
DK		 2937
2938 lock_kernel();
2939 return 0;
2940
617ba13b 2941cantfind_ext4:
ac27a0ec 2942 if (!silent)
b31e1552 2943 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 2944 goto failed_mount;
2945
2946failed_mount4:
b31e1552 2947 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 2948 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2949failed_mount_wq:
6fd058f7 2950 ext4_release_system_zone(sb);
0390131b
FM		 2951 if (sbi->s_journal) {
2952 jbd2_journal_destroy(sbi->s_journal);
2953 sbi->s_journal = NULL;
2954 }
ac27a0ec 2955failed_mount3:
c5ca7c76
TT		 2956 if (sbi->s_flex_groups) {
2957 if (is_vmalloc_addr(sbi->s_flex_groups))
2958 vfree(sbi->s_flex_groups);
2959 else
2960 kfree(sbi->s_flex_groups);
2961 }
ac27a0ec
DK		 2962 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2963 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2964 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2965 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2966failed_mount2:
2967 for (i = 0; i < db_count; i++)
2968 brelse(sbi->s_group_desc[i]);
2969 kfree(sbi->s_group_desc);
2970failed_mount:
240799cd 2971 if (sbi->s_proc) {
9f6200bb 2972 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2973 }
ac27a0ec
DK		 2974#ifdef CONFIG_QUOTA
2975 for (i = 0; i < MAXQUOTAS; i++)
2976 kfree(sbi->s_qf_names[i]);
2977#endif
617ba13b 2978 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2979 brelse(bh);
2980out_fail:
2981 sb->s_fs_info = NULL;
f6830165 2982 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2983 kfree(sbi);
2984 lock_kernel();
1d1fe1ee 2985 return ret;
ac27a0ec
DK		 2986}
2987
2988/*
2989 * Setup any per-fs journal parameters now. We'll do this both on
2990 * initial mount, once the journal has been initialised but before we've
2991 * done any recovery; and again on any subsequent remount.
2992 */
617ba13b 2993static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2994{
617ba13b 2995 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 2996
30773840
TT		 2997 journal->j_commit_interval = sbi->s_commit_interval;
2998 journal->j_min_batch_time = sbi->s_min_batch_time;
2999 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3000
3001 spin_lock(&journal->j_state_lock);
3002 if (test_opt(sb, BARRIER))
dab291af 3003 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3004 else
dab291af 3005 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3006 if (test_opt(sb, DATA_ERR_ABORT))
3007 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3008 else
3009 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 3010 spin_unlock(&journal->j_state_lock);
3011}
3012
617ba13b 3013static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3014 unsigned int journal_inum)
3015{
3016 struct inode *journal_inode;
3017 journal_t *journal;
3018
0390131b
FM		 3019 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3020
ac27a0ec
DK		 3021 /* First, test for the existence of a valid inode on disk. Bad
3022 * things happen if we iget() an unused inode, as the subsequent
3023 * iput() will try to delete it. */
3024
1d1fe1ee
DH		 3025 journal_inode = ext4_iget(sb, journal_inum);
3026 if (IS_ERR(journal_inode)) {
b31e1552 3027 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3028 return NULL;
3029 }
3030 if (!journal_inode->i_nlink) {
3031 make_bad_inode(journal_inode);
3032 iput(journal_inode);
b31e1552 3033 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3034 return NULL;
3035 }
3036
e5f8eab8 3037 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3038 journal_inode, journal_inode->i_size);
1d1fe1ee 3039 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3040 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3041 iput(journal_inode);
3042 return NULL;
3043 }
3044
dab291af 3045 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3046 if (!journal) {
b31e1552 3047 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3048 iput(journal_inode);
3049 return NULL;
3050 }
3051 journal->j_private = sb;
617ba13b 3052 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3053 return journal;
3054}
3055
617ba13b 3056static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3057 dev_t j_dev)
3058{
2b2d6d01 3059 struct buffer_head *bh;
ac27a0ec 3060 journal_t *journal;
617ba13b
MC		 3061 ext4_fsblk_t start;
3062 ext4_fsblk_t len;
ac27a0ec 3063 int hblock, blocksize;
617ba13b 3064 ext4_fsblk_t sb_block;
ac27a0ec 3065 unsigned long offset;
2b2d6d01 3066 struct ext4_super_block *es;
ac27a0ec
DK		 3067 struct block_device *bdev;
3068
0390131b
FM		 3069 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3070
b31e1552 3071 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3072 if (bdev == NULL)
3073 return NULL;
3074
3075 if (bd_claim(bdev, sb)) {
b31e1552
ES		 3076 ext4_msg(sb, KERN_ERR,
3077 "failed to claim external journal device");
9a1c3542 3078 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3079 return NULL;
3080 }
3081
3082 blocksize = sb->s_blocksize;
e1defc4f 3083 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3084 if (blocksize < hblock) {
b31e1552
ES		 3085 ext4_msg(sb, KERN_ERR,
3086 "blocksize too small for journal device");
ac27a0ec
DK		 3087 goto out_bdev;
3088 }
3089
617ba13b
MC		 3090 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3091 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3092 set_blocksize(bdev, blocksize);
3093 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3094 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3095 "external journal");
ac27a0ec
DK		 3096 goto out_bdev;
3097 }
3098
617ba13b
MC		 3099 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3100 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3101 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3102 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3103 ext4_msg(sb, KERN_ERR, "external journal has "
3104 "bad superblock");
ac27a0ec
DK		 3105 brelse(bh);
3106 goto out_bdev;
3107 }
3108
617ba13b 3109 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3110 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3111 brelse(bh);
3112 goto out_bdev;
3113 }
3114
bd81d8ee 3115 len = ext4_blocks_count(es);
ac27a0ec
DK		 3116 start = sb_block + 1;
3117 brelse(bh); /* we're done with the superblock */
3118
dab291af 3119 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3120 start, len, blocksize);
3121 if (!journal) {
b31e1552 3122 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3123 goto out_bdev;
3124 }
3125 journal->j_private = sb;
3126 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3127 wait_on_buffer(journal->j_sb_buffer);
3128 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3129 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3130 goto out_journal;
3131 }
3132 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3133 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3134 "user (unsupported) - %d",
ac27a0ec
DK		 3135 be32_to_cpu(journal->j_superblock->s_nr_users));
3136 goto out_journal;
3137 }
617ba13b
MC		 3138 EXT4_SB(sb)->journal_bdev = bdev;
3139 ext4_init_journal_params(sb, journal);
ac27a0ec 3140 return journal;
0b8e58a1 3141
ac27a0ec 3142out_journal:
dab291af 3143 jbd2_journal_destroy(journal);
ac27a0ec 3144out_bdev:
617ba13b 3145 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3146 return NULL;
3147}
3148
617ba13b
MC		 3149static int ext4_load_journal(struct super_block *sb,
3150 struct ext4_super_block *es,
ac27a0ec
DK		 3151 unsigned long journal_devnum)
3152{
3153 journal_t *journal;
3154 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3155 dev_t journal_dev;
3156 int err = 0;
3157 int really_read_only;
3158
0390131b
FM		 3159 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3160
ac27a0ec
DK		 3161 if (journal_devnum &&
3162 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3163 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3164 "numbers have changed");
ac27a0ec
DK		 3165 journal_dev = new_decode_dev(journal_devnum);
3166 } else
3167 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3168
3169 really_read_only = bdev_read_only(sb->s_bdev);
3170
3171 /*
3172 * Are we loading a blank journal or performing recovery after a
3173 * crash? For recovery, we need to check in advance whether we
3174 * can get read-write access to the device.
3175 */
617ba13b 3176 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3177 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3178 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3179 "required on readonly filesystem");
ac27a0ec 3180 if (really_read_only) {
b31e1552
ES		 3181 ext4_msg(sb, KERN_ERR, "write access "
3182 "unavailable, cannot proceed");
ac27a0ec
DK		 3183 return -EROFS;
3184 }
b31e1552
ES		 3185 ext4_msg(sb, KERN_INFO, "write access will "
3186 "be enabled during recovery");
ac27a0ec
DK		 3187 }
3188 }
3189
3190 if (journal_inum && journal_dev) {
b31e1552
ES		 3191 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3192 "and inode journals!");
ac27a0ec
DK		 3193 return -EINVAL;
3194 }
3195
3196 if (journal_inum) {
617ba13b 3197 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3198 return -EINVAL;
3199 } else {
617ba13b 3200 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3201 return -EINVAL;
3202 }
3203
90576c0b 3204 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3205 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3206
ac27a0ec 3207 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3208 err = jbd2_journal_update_format(journal);
ac27a0ec 3209 if (err) {
b31e1552 3210 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3211 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3212 return err;
3213 }
3214 }
3215
617ba13b 3216 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3217 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3218 if (!err)
dab291af 3219 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3220
3221 if (err) {
b31e1552 3222 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3223 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3224 return err;
3225 }
3226
617ba13b
MC		 3227 EXT4_SB(sb)->s_journal = journal;
3228 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3229
3230 if (journal_devnum &&
3231 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3232 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3233
3234 /* Make sure we flush the recovery flag to disk. */
e2d67052 3235 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3236 }
3237
3238 return 0;
3239}
3240
e2d67052 3241static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3242{
e2d67052 3243 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3244 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3245 int error = 0;
ac27a0ec
DK		 3246
3247 if (!sbh)
c4be0c1d 3248 return error;
914258bf
TT		 3249 if (buffer_write_io_error(sbh)) {
3250 /*
3251 * Oh, dear. A previous attempt to write the
3252 * superblock failed. This could happen because the
3253 * USB device was yanked out. Or it could happen to
3254 * be a transient write error and maybe the block will
3255 * be remapped. Nothing we can do but to retry the
3256 * write and hope for the best.
3257 */
b31e1552
ES		 3258 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3259 "superblock detected");
914258bf
TT		 3260 clear_buffer_write_io_error(sbh);
3261 set_buffer_uptodate(sbh);
3262 }
71290b36
TT		 3263 /*
3264 * If the file system is mounted read-only, don't update the
3265 * superblock write time. This avoids updating the superblock
3266 * write time when we are mounting the root file system
3267 * read/only but we need to replay the journal; at that point,
3268 * for people who are east of GMT and who make their clock
3269 * tick in localtime for Windows bug-for-bug compatibility,
3270 * the clock is set in the future, and this will cause e2fsck
3271 * to complain and force a full file system check.
3272 */
3273 if (!(sb->s_flags & MS_RDONLY))
3274 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3275 es->s_kbytes_written =
3276 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3277 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3278 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3279 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3280 &EXT4_SB(sb)->s_freeblocks_counter));
3281 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3282 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3283 sb->s_dirt = 0;
ac27a0ec
DK		 3284 BUFFER_TRACE(sbh, "marking dirty");
3285 mark_buffer_dirty(sbh);
914258bf 3286 if (sync) {
c4be0c1d
TS		 3287 error = sync_dirty_buffer(sbh);
3288 if (error)
3289 return error;
3290
3291 error = buffer_write_io_error(sbh);
3292 if (error) {
b31e1552
ES		 3293 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3294 "superblock");
914258bf
TT		 3295 clear_buffer_write_io_error(sbh);
3296 set_buffer_uptodate(sbh);
3297 }
3298 }
c4be0c1d 3299 return error;
ac27a0ec
DK		 3300}
3301
ac27a0ec
DK		 3302/*
3303 * Have we just finished recovery? If so, and if we are mounting (or
3304 * remounting) the filesystem readonly, then we will end up with a
3305 * consistent fs on disk. Record that fact.
3306 */
2b2d6d01
TT		 3307static void ext4_mark_recovery_complete(struct super_block *sb,
3308 struct ext4_super_block *es)
ac27a0ec 3309{
617ba13b 3310 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3311
0390131b
FM		 3312 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3313 BUG_ON(journal != NULL);
3314 return;
3315 }
dab291af 3316 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3317 if (jbd2_journal_flush(journal) < 0)
3318 goto out;
3319
617ba13b 3320 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3321 sb->s_flags & MS_RDONLY) {
617ba13b 3322 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3323 ext4_commit_super(sb, 1);
ac27a0ec 3324 }
7ffe1ea8
HK		 3325
3326out:
dab291af 3327 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3328}
3329
3330/*
3331 * If we are mounting (or read-write remounting) a filesystem whose journal
3332 * has recorded an error from a previous lifetime, move that error to the
3333 * main filesystem now.
3334 */
2b2d6d01
TT		 3335static void ext4_clear_journal_err(struct super_block *sb,
3336 struct ext4_super_block *es)
ac27a0ec
DK		 3337{
3338 journal_t *journal;
3339 int j_errno;
3340 const char *errstr;
3341
0390131b
FM		 3342 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3343
617ba13b 3344 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3345
3346 /*
3347 * Now check for any error status which may have been recorded in the
617ba13b 3348 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3349 */
3350
dab291af 3351 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3352 if (j_errno) {
3353 char nbuf[16];
3354
617ba13b 3355 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3356 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3357 "from previous mount: %s", errstr);
46e665e9 3358 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3359 "filesystem check.");
3360
617ba13b
MC		 3361 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3362 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3363 ext4_commit_super(sb, 1);
ac27a0ec 3364
dab291af 3365 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3366 }
3367}
3368
3369/*
3370 * Force the running and committing transactions to commit,
3371 * and wait on the commit.
3372 */
617ba13b 3373int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3374{
3375 journal_t *journal;
0390131b 3376 int ret = 0;
ac27a0ec
DK		 3377
3378 if (sb->s_flags & MS_RDONLY)
3379 return 0;
3380
617ba13b 3381 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3382 if (journal)
0390131b 3383 ret = ext4_journal_force_commit(journal);
0390131b 3384
ac27a0ec
DK		 3385 return ret;
3386}
3387
2b2d6d01 3388static void ext4_write_super(struct super_block *sb)
ac27a0ec 3389{
ebc1ac16 3390 lock_super(sb);
9ca92389 3391 ext4_commit_super(sb, 1);
ebc1ac16 3392 unlock_super(sb);
ac27a0ec
DK		 3393}
3394
617ba13b 3395static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3396{
14ce0cb4 3397 int ret = 0;
9eddacf9 3398 tid_t target;
8d5d02e6 3399 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3400
9bffad1e 3401 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 3402 flush_workqueue(sbi->dio_unwritten_wq);
3403 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 3404 if (wait)
8d5d02e6 3405 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 3406 }
14ce0cb4 3407 return ret;
ac27a0ec
DK		 3408}
3409
3410/*
3411 * LVM calls this function before a (read-only) snapshot is created. This
3412 * gives us a chance to flush the journal completely and mark the fs clean.
3413 */
c4be0c1d 3414static int ext4_freeze(struct super_block *sb)
ac27a0ec 3415{
c4be0c1d
TS		 3416 int error = 0;
3417 journal_t *journal;
ac27a0ec 3418
9ca92389
TT		 3419 if (sb->s_flags & MS_RDONLY)
3420 return 0;
ac27a0ec 3421
9ca92389 3422 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3423
9ca92389
TT		 3424 /* Now we set up the journal barrier. */
3425 jbd2_journal_lock_updates(journal);
ac27a0ec 3426
9ca92389
TT		 3427 /*
3428 * Don't clear the needs_recovery flag if we failed to flush
3429 * the journal.
3430 */
3431 error = jbd2_journal_flush(journal);
3432 if (error < 0) {
3433 out:
3434 jbd2_journal_unlock_updates(journal);
3435 return error;
ac27a0ec 3436 }
9ca92389
TT		 3437
3438 /* Journal blocked and flushed, clear needs_recovery flag. */
3439 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3440 error = ext4_commit_super(sb, 1);
3441 if (error)
3442 goto out;
c4be0c1d 3443 return 0;
ac27a0ec
DK		 3444}
3445
3446/*
3447 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3448 * flag here, even though the filesystem is not technically dirty yet.
3449 */
c4be0c1d 3450static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3451{
9ca92389
TT		 3452 if (sb->s_flags & MS_RDONLY)
3453 return 0;
3454
3455 lock_super(sb);
3456 /* Reset the needs_recovery flag before the fs is unlocked. */
3457 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3458 ext4_commit_super(sb, 1);
3459 unlock_super(sb);
3460 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3461 return 0;
ac27a0ec
DK		 3462}
3463
2b2d6d01 3464static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3465{
2b2d6d01 3466 struct ext4_super_block *es;
617ba13b
MC		 3467 struct ext4_sb_info *sbi = EXT4_SB(sb);
3468 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3469 unsigned long old_sb_flags;
617ba13b 3470 struct ext4_mount_options old_opts;
8a266467 3471 ext4_group_t g;
b3881f74 3472 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3473 int err;
3474#ifdef CONFIG_QUOTA
3475 int i;
3476#endif
3477
337eb00a
AIB		 3478 lock_kernel();
3479
ac27a0ec 3480 /* Store the original options */
bbd6851a 3481 lock_super(sb);
ac27a0ec
DK		 3482 old_sb_flags = sb->s_flags;
3483 old_opts.s_mount_opt = sbi->s_mount_opt;
3484 old_opts.s_resuid = sbi->s_resuid;
3485 old_opts.s_resgid = sbi->s_resgid;
3486 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3487 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3488 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3489#ifdef CONFIG_QUOTA
3490 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3491 for (i = 0; i < MAXQUOTAS; i++)
3492 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3493#endif
b3881f74
TT		 3494 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3495 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3496
3497 /*
3498 * Allow the "check" option to be passed as a remount option.
3499 */
b3881f74
TT		 3500 if (!parse_options(data, sb, NULL, &journal_ioprio,
3501 &n_blocks_count, 1)) {
ac27a0ec
DK		 3502 err = -EINVAL;
3503 goto restore_opts;
3504 }
3505
4ab2f15b 3506 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
46e665e9 3507 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3508
3509 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3510 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3511
3512 es = sbi->s_es;
3513
b3881f74 3514 if (sbi->s_journal) {
0390131b 3515 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3516 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3517 }
ac27a0ec
DK		 3518
3519 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3520 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 3521 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 3522 err = -EROFS;
3523 goto restore_opts;
3524 }
3525
3526 if (*flags & MS_RDONLY) {
3527 /*
3528 * First of all, the unconditional stuff we have to do
3529 * to disable replay of the journal when we next remount
3530 */
3531 sb->s_flags |= MS_RDONLY;
3532
3533 /*
3534 * OK, test if we are remounting a valid rw partition
3535 * readonly, and if so set the rdonly flag and then
3536 * mark the partition as valid again.
3537 */
617ba13b
MC		 3538 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3539 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3540 es->s_state = cpu_to_le16(sbi->s_mount_state);
3541
a63c9eb2 3542 if (sbi->s_journal)
0390131b 3543 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3544 } else {
a13fb1a4
ES		 3545 /* Make sure we can mount this feature set readwrite */
3546 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 3547 err = -EROFS;
3548 goto restore_opts;
3549 }
8a266467
TT		 3550 /*
3551 * Make sure the group descriptor checksums
0b8e58a1 3552 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 3553 */
3554 for (g = 0; g < sbi->s_groups_count; g++) {
3555 struct ext4_group_desc *gdp =
3556 ext4_get_group_desc(sb, g, NULL);
3557
3558 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 3559 ext4_msg(sb, KERN_ERR,
3560 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 3561 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3562 le16_to_cpu(gdp->bg_checksum));
3563 err = -EINVAL;
3564 goto restore_opts;
3565 }
3566 }
3567
ead6596b
ES		 3568 /*
3569 * If we have an unprocessed orphan list hanging
3570 * around from a previously readonly bdev mount,
3571 * require a full umount/remount for now.
3572 */
3573 if (es->s_last_orphan) {
b31e1552 3574 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 3575 "remount RDWR because of unprocessed "
3576 "orphan inode list. Please "
b31e1552 3577 "umount/remount instead");
ead6596b
ES		 3578 err = -EINVAL;
3579 goto restore_opts;
3580 }
3581
ac27a0ec
DK		 3582 /*
3583 * Mounting a RDONLY partition read-write, so reread
3584 * and store the current valid flag. (It may have
3585 * been changed by e2fsck since we originally mounted
3586 * the partition.)
3587 */
0390131b
FM		 3588 if (sbi->s_journal)
3589 ext4_clear_journal_err(sb, es);
ac27a0ec 3590 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3591 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3592 goto restore_opts;
2b2d6d01 3593 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3594 sb->s_flags &= ~MS_RDONLY;
3595 }
3596 }
6fd058f7 3597 ext4_setup_system_zone(sb);
0390131b 3598 if (sbi->s_journal == NULL)
e2d67052 3599 ext4_commit_super(sb, 1);
0390131b 3600
ac27a0ec
DK		 3601#ifdef CONFIG_QUOTA
3602 /* Release old quota file names */
3603 for (i = 0; i < MAXQUOTAS; i++)
3604 if (old_opts.s_qf_names[i] &&
3605 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3606 kfree(old_opts.s_qf_names[i]);
3607#endif
bbd6851a 3608 unlock_super(sb);
337eb00a 3609 unlock_kernel();
ac27a0ec 3610 return 0;
0b8e58a1 3611
ac27a0ec
DK		 3612restore_opts:
3613 sb->s_flags = old_sb_flags;
3614 sbi->s_mount_opt = old_opts.s_mount_opt;
3615 sbi->s_resuid = old_opts.s_resuid;
3616 sbi->s_resgid = old_opts.s_resgid;
3617 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3618 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3619 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3620#ifdef CONFIG_QUOTA
3621 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3622 for (i = 0; i < MAXQUOTAS; i++) {
3623 if (sbi->s_qf_names[i] &&
3624 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3625 kfree(sbi->s_qf_names[i]);
3626 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3627 }
3628#endif
bbd6851a 3629 unlock_super(sb);
337eb00a 3630 unlock_kernel();
ac27a0ec
DK		 3631 return err;
3632}
3633
2b2d6d01 3634static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3635{
3636 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3637 struct ext4_sb_info *sbi = EXT4_SB(sb);
3638 struct ext4_super_block *es = sbi->s_es;
960cc398 3639 u64 fsid;
ac27a0ec 3640
5e70030d
BP		 3641 if (test_opt(sb, MINIX_DF)) {
3642 sbi->s_overhead_last = 0;
6bc9feff 3643 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3644 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3645 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3646
3647 /*
5e70030d
BP		 3648 * Compute the overhead (FS structures). This is constant
3649 * for a given filesystem unless the number of block groups
3650 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3651 */
3652
3653 /*
3654 * All of the blocks before first_data_block are
3655 * overhead
3656 */
3657 overhead = le32_to_cpu(es->s_first_data_block);
3658
3659 /*
3660 * Add the overhead attributed to the superblock and
3661 * block group descriptors. If the sparse superblocks
3662 * feature is turned on, then not all groups have this.
3663 */
3664 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3665 overhead += ext4_bg_has_super(sb, i) +
3666 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3667 cond_resched();
3668 }
3669
3670 /*
3671 * Every block group has an inode bitmap, a block
3672 * bitmap, and an inode table.
3673 */
5e70030d
BP		 3674 overhead += ngroups * (2 + sbi->s_itb_per_group);
3675 sbi->s_overhead_last = overhead;
3676 smp_wmb();
6bc9feff 3677 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3678 }
3679
617ba13b 3680 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3681 buf->f_bsize = sb->s_blocksize;
5e70030d 3682 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3683 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3684 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
bd81d8ee
LV		 3685 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3686 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3687 buf->f_bavail = 0;
3688 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3689 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 3690 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3691 fsid = le64_to_cpup((void *)es->s_uuid) ^
3692 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3693 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3694 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 3695
ac27a0ec
DK		 3696 return 0;
3697}
3698
0b8e58a1
AD		 3699/* Helper function for writing quotas on sync - we need to start transaction
3700 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 3701 * Process 1 Process 2
617ba13b 3702 * ext4_create() quota_sync()
a269eb18
JK		 3703 * jbd2_journal_start() write_dquot()
3704 * vfs_dq_init() down(dqio_mutex)
dab291af 3705 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3706 *
3707 */
3708
3709#ifdef CONFIG_QUOTA
3710
3711static inline struct inode *dquot_to_inode(struct dquot *dquot)
3712{
3713 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3714}
3715
617ba13b 3716static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3717{
3718 int ret, err;
3719 handle_t *handle;
3720 struct inode *inode;
3721
3722 inode = dquot_to_inode(dquot);
617ba13b 3723 handle = ext4_journal_start(inode,
0b8e58a1 3724 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3725 if (IS_ERR(handle))
3726 return PTR_ERR(handle);
3727 ret = dquot_commit(dquot);
617ba13b 3728 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3729 if (!ret)
3730 ret = err;
3731 return ret;
3732}
3733
617ba13b 3734static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3735{
3736 int ret, err;
3737 handle_t *handle;
3738
617ba13b 3739 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3740 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3741 if (IS_ERR(handle))
3742 return PTR_ERR(handle);
3743 ret = dquot_acquire(dquot);
617ba13b 3744 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3745 if (!ret)
3746 ret = err;
3747 return ret;
3748}
3749
617ba13b 3750static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3751{
3752 int ret, err;
3753 handle_t *handle;
3754
617ba13b 3755 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3756 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3757 if (IS_ERR(handle)) {
3758 /* Release dquot anyway to avoid endless cycle in dqput() */
3759 dquot_release(dquot);
ac27a0ec 3760 return PTR_ERR(handle);
9c3013e9 3761 }
ac27a0ec 3762 ret = dquot_release(dquot);
617ba13b 3763 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3764 if (!ret)
3765 ret = err;
3766 return ret;
3767}
3768
617ba13b 3769static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3770{
2c8be6b2 3771 /* Are we journaling quotas? */
617ba13b
MC		 3772 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3773 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3774 dquot_mark_dquot_dirty(dquot);
617ba13b 3775 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3776 } else {
3777 return dquot_mark_dquot_dirty(dquot);
3778 }
3779}
3780
617ba13b 3781static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3782{
3783 int ret, err;
3784 handle_t *handle;
3785
3786 /* Data block + inode block */
617ba13b 3787 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3788 if (IS_ERR(handle))
3789 return PTR_ERR(handle);
3790 ret = dquot_commit_info(sb, type);
617ba13b 3791 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3792 if (!ret)
3793 ret = err;
3794 return ret;
3795}
3796
3797/*
3798 * Turn on quotas during mount time - we need to find
3799 * the quota file and such...
3800 */
617ba13b 3801static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3802{
617ba13b 3803 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
0b8e58a1 3804 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3805}
3806
3807/*
3808 * Standard function to be called on quota_on
3809 */
617ba13b 3810static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3811 char *name, int remount)
ac27a0ec
DK		 3812{
3813 int err;
8264613d 3814 struct path path;
ac27a0ec
DK		 3815
3816 if (!test_opt(sb, QUOTA))
3817 return -EINVAL;
8264613d 3818 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3819 if (remount)
8264613d 3820 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3821
8264613d 3822 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3823 if (err)
3824 return err;
0623543b 3825
ac27a0ec 3826 /* Quotafile not on the same filesystem? */
8264613d
AV		 3827 if (path.mnt->mnt_sb != sb) {
3828 path_put(&path);
ac27a0ec
DK		 3829 return -EXDEV;
3830 }
0623543b
JK		 3831 /* Journaling quota? */
3832 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3833 /* Quotafile not in fs root? */
8264613d 3834 if (path.dentry->d_parent != sb->s_root)
b31e1552
ES		 3835 ext4_msg(sb, KERN_WARNING,
3836 "Quota file not on filesystem root. "
3837 "Journaled quota will not work");
2b2d6d01 3838 }
0623543b
JK		 3839
3840 /*
3841 * When we journal data on quota file, we have to flush journal to see
3842 * all updates to the file when we bypass pagecache...
3843 */
0390131b
FM		 3844 if (EXT4_SB(sb)->s_journal &&
3845 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3846 /*
3847 * We don't need to lock updates but journal_flush() could
3848 * otherwise be livelocked...
3849 */
3850 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3851 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3852 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3853 if (err) {
8264613d 3854 path_put(&path);
7ffe1ea8
HK		 3855 return err;
3856 }
0623543b
JK		 3857 }
3858
8264613d
AV		 3859 err = vfs_quota_on_path(sb, type, format_id, &path);
3860 path_put(&path);
77e69dac 3861 return err;
ac27a0ec
DK		 3862}
3863
3864/* Read data from quotafile - avoid pagecache and such because we cannot afford
3865 * acquiring the locks... As quota files are never truncated and quota code
3866 * itself serializes the operations (and noone else should touch the files)
3867 * we don't have to be afraid of races */
617ba13b 3868static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3869 size_t len, loff_t off)
3870{
3871 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3872 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3873 int err = 0;
3874 int offset = off & (sb->s_blocksize - 1);
3875 int tocopy;
3876 size_t toread;
3877 struct buffer_head *bh;
3878 loff_t i_size = i_size_read(inode);
3879
3880 if (off > i_size)
3881 return 0;
3882 if (off+len > i_size)
3883 len = i_size-off;
3884 toread = len;
3885 while (toread > 0) {
3886 tocopy = sb->s_blocksize - offset < toread ?
3887 sb->s_blocksize - offset : toread;
617ba13b 3888 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3889 if (err)
3890 return err;
3891 if (!bh) /* A hole? */
3892 memset(data, 0, tocopy);
3893 else
3894 memcpy(data, bh->b_data+offset, tocopy);
3895 brelse(bh);
3896 offset = 0;
3897 toread -= tocopy;
3898 data += tocopy;
3899 blk++;
3900 }
3901 return len;
3902}
3903
3904/* Write to quotafile (we know the transaction is already started and has
3905 * enough credits) */
617ba13b 3906static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3907 const char *data, size_t len, loff_t off)
3908{
3909 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3910 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3911 int err = 0;
3912 int offset = off & (sb->s_blocksize - 1);
3913 int tocopy;
617ba13b 3914 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3915 size_t towrite = len;
3916 struct buffer_head *bh;
3917 handle_t *handle = journal_current_handle();
3918
0390131b 3919 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 3920 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3921 " cancelled because transaction is not started",
9c3013e9
JK		 3922 (unsigned long long)off, (unsigned long long)len);
3923 return -EIO;
3924 }
ac27a0ec
DK		 3925 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3926 while (towrite > 0) {
3927 tocopy = sb->s_blocksize - offset < towrite ?
3928 sb->s_blocksize - offset : towrite;
617ba13b 3929 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3930 if (!bh)
3931 goto out;
3932 if (journal_quota) {
617ba13b 3933 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3934 if (err) {
3935 brelse(bh);
3936 goto out;
3937 }
3938 }
3939 lock_buffer(bh);
3940 memcpy(bh->b_data+offset, data, tocopy);
3941 flush_dcache_page(bh->b_page);
3942 unlock_buffer(bh);
3943 if (journal_quota)
0390131b 3944 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3945 else {
3946 /* Always do at least ordered writes for quotas */
678aaf48 3947 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3948 mark_buffer_dirty(bh);
3949 }
3950 brelse(bh);
3951 if (err)
3952 goto out;
3953 offset = 0;
3954 towrite -= tocopy;
3955 data += tocopy;
3956 blk++;
3957 }
3958out:
4d04e4fb
JK		 3959 if (len == towrite) {
3960 mutex_unlock(&inode->i_mutex);
ac27a0ec 3961 return err;
4d04e4fb 3962 }
ac27a0ec
DK		 3963 if (inode->i_size < off+len-towrite) {
3964 i_size_write(inode, off+len-towrite);
617ba13b 3965 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3966 }
ac27a0ec 3967 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3968 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3969 mutex_unlock(&inode->i_mutex);
3970 return len - towrite;
3971}
3972
3973#endif
3974
0b8e58a1
AD		 3975static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3976 const char *dev_name, void *data, struct vfsmount *mnt)
ac27a0ec 3977{
0b8e58a1 3978 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
ac27a0ec
DK		 3979}
3980
a214238d 3981#if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 3982static struct file_system_type ext2_fs_type = {
3983 .owner = THIS_MODULE,
3984 .name = "ext2",
3985 .get_sb = ext4_get_sb,
3986 .kill_sb = kill_block_super,
3987 .fs_flags = FS_REQUIRES_DEV,
3988};
3989
3990static inline void register_as_ext2(void)
3991{
3992 int err = register_filesystem(&ext2_fs_type);
3993 if (err)
3994 printk(KERN_WARNING
3995 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
3996}
3997
3998static inline void unregister_as_ext2(void)
3999{
4000 unregister_filesystem(&ext2_fs_type);
4001}
51b7e3c9 4002MODULE_ALIAS("ext2");
24b58424
TT		 4003#else
4004static inline void register_as_ext2(void) { }
4005static inline void unregister_as_ext2(void) { }
4006#endif
4007
a214238d 4008#if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4009static struct file_system_type ext3_fs_type = {
4010 .owner = THIS_MODULE,
4011 .name = "ext3",
4012 .get_sb = ext4_get_sb,
4013 .kill_sb = kill_block_super,
4014 .fs_flags = FS_REQUIRES_DEV,
4015};
4016
4017static inline void register_as_ext3(void)
4018{
4019 int err = register_filesystem(&ext3_fs_type);
4020 if (err)
4021 printk(KERN_WARNING
4022 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4023}
4024
4025static inline void unregister_as_ext3(void)
4026{
4027 unregister_filesystem(&ext3_fs_type);
4028}
51b7e3c9 4029MODULE_ALIAS("ext3");
24b58424
TT		 4030#else
4031static inline void register_as_ext3(void) { }
4032static inline void unregister_as_ext3(void) { }
4033#endif
4034
03010a33
TT		 4035static struct file_system_type ext4_fs_type = {
4036 .owner = THIS_MODULE,
4037 .name = "ext4",
4038 .get_sb = ext4_get_sb,
4039 .kill_sb = kill_block_super,
4040 .fs_flags = FS_REQUIRES_DEV,
4041};
4042
617ba13b 4043static int __init init_ext4_fs(void)
ac27a0ec 4044{
c9de560d
AT		 4045 int err;
4046
6fd058f7
TT		 4047 err = init_ext4_system_zone();
4048 if (err)
4049 return err;
3197ebdb
TT		 4050 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4051 if (!ext4_kset)
6fd058f7 4052 goto out4;
9f6200bb 4053 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 4054 err = init_ext4_mballoc();
ac27a0ec 4055 if (err)
6fd058f7 4056 goto out3;
c9de560d
AT		 4057
4058 err = init_ext4_xattr();
4059 if (err)
4060 goto out2;
ac27a0ec
DK		 4061 err = init_inodecache();
4062 if (err)
4063 goto out1;
24b58424
TT		 4064 register_as_ext2();
4065 register_as_ext3();
03010a33 4066 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4067 if (err)
4068 goto out;
4069 return 0;
4070out:
24b58424
TT		 4071 unregister_as_ext2();
4072 unregister_as_ext3();
ac27a0ec
DK		 4073 destroy_inodecache();
4074out1:
617ba13b 4075 exit_ext4_xattr();
c9de560d
AT		 4076out2:
4077 exit_ext4_mballoc();
6fd058f7
TT		 4078out3:
4079 remove_proc_entry("fs/ext4", NULL);
4080 kset_unregister(ext4_kset);
4081out4:
4082 exit_ext4_system_zone();
ac27a0ec
DK		 4083 return err;
4084}
4085
617ba13b 4086static void __exit exit_ext4_fs(void)
ac27a0ec 4087{
24b58424
TT		 4088 unregister_as_ext2();
4089 unregister_as_ext3();
03010a33 4090 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4091 destroy_inodecache();
617ba13b 4092 exit_ext4_xattr();
c9de560d 4093 exit_ext4_mballoc();
9f6200bb 4094 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4095 kset_unregister(ext4_kset);
6fd058f7 4096 exit_ext4_system_zone();
ac27a0ec
DK		 4097}
4098
4099MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4100MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4101MODULE_LICENSE("GPL");
617ba13b
MC		 4102module_init(init_ext4_fs)
4103module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)