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ext4: Reserve INCOMPAT_EA_INODE and INCOMPAT_DIRDATA feature codepoints
[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{
c2ea3fde 764 ext4_discard_preallocations(inode);
0390131b
FM		 765 if (EXT4_JOURNAL(inode))
766 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 767 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 768}
769
2b2d6d01
TT		 770static inline void ext4_show_quota_options(struct seq_file *seq,
771 struct super_block *sb)
ac27a0ec
DK		 772{
773#if defined(CONFIG_QUOTA)
617ba13b 774 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 775
5a20bdfc
JK		 776 if (sbi->s_jquota_fmt) {
777 char *fmtname = "";
778
779 switch (sbi->s_jquota_fmt) {
780 case QFMT_VFS_OLD:
781 fmtname = "vfsold";
782 break;
783 case QFMT_VFS_V0:
784 fmtname = "vfsv0";
785 break;
786 case QFMT_VFS_V1:
787 fmtname = "vfsv1";
788 break;
789 }
790 seq_printf(seq, ",jqfmt=%s", fmtname);
791 }
ac27a0ec
DK		 792
793 if (sbi->s_qf_names[USRQUOTA])
794 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
795
796 if (sbi->s_qf_names[GRPQUOTA])
797 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
798
617ba13b 799 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 800 seq_puts(seq, ",usrquota");
801
617ba13b 802 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 803 seq_puts(seq, ",grpquota");
804#endif
805}
806
d9c9bef1
MS		 807/*
808 * Show an option if
809 * - it's set to a non-default value OR
810 * - if the per-sb default is different from the global default
811 */
617ba13b 812static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 813{
aa22df2c
AK		 814 int def_errors;
815 unsigned long def_mount_opts;
ac27a0ec 816 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 817 struct ext4_sb_info *sbi = EXT4_SB(sb);
818 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 819
820 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 821 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 822
823 if (sbi->s_sb_block != 1)
824 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
825 if (test_opt(sb, MINIX_DF))
826 seq_puts(seq, ",minixdf");
aa22df2c 827 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 828 seq_puts(seq, ",grpid");
829 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
830 seq_puts(seq, ",nogrpid");
831 if (sbi->s_resuid != EXT4_DEF_RESUID ||
832 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
833 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
834 }
835 if (sbi->s_resgid != EXT4_DEF_RESGID ||
836 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
837 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
838 }
bb4f397a 839 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 840 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 841 def_errors == EXT4_ERRORS_CONTINUE) {
842 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 843 }
844 }
aa22df2c 845 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 846 seq_puts(seq, ",errors=continue");
aa22df2c 847 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 848 seq_puts(seq, ",errors=panic");
aa22df2c 849 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 850 seq_puts(seq, ",nouid32");
aa22df2c 851 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 852 seq_puts(seq, ",debug");
853 if (test_opt(sb, OLDALLOC))
854 seq_puts(seq, ",oldalloc");
03010a33 855#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 856 if (test_opt(sb, XATTR_USER) &&
857 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 858 seq_puts(seq, ",user_xattr");
859 if (!test_opt(sb, XATTR_USER) &&
860 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
861 seq_puts(seq, ",nouser_xattr");
862 }
863#endif
03010a33 864#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 865 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 866 seq_puts(seq, ",acl");
867 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
868 seq_puts(seq, ",noacl");
869#endif
30773840 870 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 871 seq_printf(seq, ",commit=%u",
872 (unsigned) (sbi->s_commit_interval / HZ));
873 }
30773840
TT		 874 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
875 seq_printf(seq, ",min_batch_time=%u",
876 (unsigned) sbi->s_min_batch_time);
877 }
878 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
879 seq_printf(seq, ",max_batch_time=%u",
880 (unsigned) sbi->s_min_batch_time);
881 }
882
571640ca
ES		 883 /*
884 * We're changing the default of barrier mount option, so
885 * let's always display its mount state so it's clear what its
886 * status is.
887 */
888 seq_puts(seq, ",barrier=");
889 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 890 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
891 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 892 if (test_opt(sb, NOBH))
893 seq_puts(seq, ",nobh");
25ec56b5
JNC		 894 if (test_opt(sb, I_VERSION))
895 seq_puts(seq, ",i_version");
dd919b98
AK		 896 if (!test_opt(sb, DELALLOC))
897 seq_puts(seq, ",nodelalloc");
898
ac27a0ec 899
cb45bbe4
MS		 900 if (sbi->s_stripe)
901 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 902 /*
903 * journal mode get enabled in different ways
904 * So just print the value even if we didn't specify it
905 */
617ba13b 906 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 907 seq_puts(seq, ",data=journal");
617ba13b 908 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 909 seq_puts(seq, ",data=ordered");
617ba13b 910 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 911 seq_puts(seq, ",data=writeback");
912
240799cd
TT		 913 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
914 seq_printf(seq, ",inode_readahead_blks=%u",
915 sbi->s_inode_readahead_blks);
916
5bf5683a
HK		 917 if (test_opt(sb, DATA_ERR_ABORT))
918 seq_puts(seq, ",data_err=abort");
919
afd4672d 920 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 921 seq_puts(seq, ",noauto_da_alloc");
afd4672d 922
5328e635
ES		 923 if (test_opt(sb, DISCARD))
924 seq_puts(seq, ",discard");
925
e3bb52ae
ES		 926 if (test_opt(sb, NOLOAD))
927 seq_puts(seq, ",norecovery");
928
617ba13b 929 ext4_show_quota_options(seq, sb);
0b8e58a1 930
ac27a0ec
DK		 931 return 0;
932}
933
1b961ac0 934static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 935 u64 ino, u32 generation)
ac27a0ec 936{
ac27a0ec 937 struct inode *inode;
ac27a0ec 938
617ba13b 939 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 940 return ERR_PTR(-ESTALE);
617ba13b 941 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 942 return ERR_PTR(-ESTALE);
943
944 /* iget isn't really right if the inode is currently unallocated!!
945 *
617ba13b 946 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 947 * deleted, so we should be safe.
948 *
949 * Currently we don't know the generation for parent directory, so
950 * a generation of 0 means "accept any"
951 */
1d1fe1ee
DH		 952 inode = ext4_iget(sb, ino);
953 if (IS_ERR(inode))
954 return ERR_CAST(inode);
955 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 956 iput(inode);
957 return ERR_PTR(-ESTALE);
958 }
1b961ac0
CH		 959
960 return inode;
961}
962
963static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 964 int fh_len, int fh_type)
1b961ac0
CH		 965{
966 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
967 ext4_nfs_get_inode);
968}
969
970static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 971 int fh_len, int fh_type)
1b961ac0
CH		 972{
973 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
974 ext4_nfs_get_inode);
ac27a0ec
DK		 975}
976
c39a7f84
TO		 977/*
978 * Try to release metadata pages (indirect blocks, directories) which are
979 * mapped via the block device. Since these pages could have journal heads
980 * which would prevent try_to_free_buffers() from freeing them, we must use
981 * jbd2 layer's try_to_free_buffers() function to release them.
982 */
0b8e58a1
AD		 983static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
984 gfp_t wait)
c39a7f84
TO		 985{
986 journal_t *journal = EXT4_SB(sb)->s_journal;
987
988 WARN_ON(PageChecked(page));
989 if (!page_has_buffers(page))
990 return 0;
991 if (journal)
992 return jbd2_journal_try_to_free_buffers(journal, page,
993 wait & ~__GFP_WAIT);
994 return try_to_free_buffers(page);
995}
996
ac27a0ec 997#ifdef CONFIG_QUOTA
af5bc92d 998#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 999#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1000
617ba13b
MC		 1001static int ext4_write_dquot(struct dquot *dquot);
1002static int ext4_acquire_dquot(struct dquot *dquot);
1003static int ext4_release_dquot(struct dquot *dquot);
1004static int ext4_mark_dquot_dirty(struct dquot *dquot);
1005static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 1006static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1007 char *path, int remount);
617ba13b
MC		 1008static int ext4_quota_on_mount(struct super_block *sb, int type);
1009static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1010 size_t len, loff_t off);
617ba13b 1011static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1012 const char *data, size_t len, loff_t off);
1013
61e225dc 1014static const struct dquot_operations ext4_quota_operations = {
edf72453
JK		 1015 .initialize = dquot_initialize,
1016 .drop = dquot_drop,
ac27a0ec 1017 .alloc_space = dquot_alloc_space,
60e58e0f
MC		 1018 .reserve_space = dquot_reserve_space,
1019 .claim_space = dquot_claim_space,
1020 .release_rsv = dquot_release_reserved_space,
a9e7f447 1021#ifdef CONFIG_QUOTA
60e58e0f 1022 .get_reserved_space = ext4_get_reserved_space,
a9e7f447 1023#endif
ac27a0ec
DK		 1024 .alloc_inode = dquot_alloc_inode,
1025 .free_space = dquot_free_space,
1026 .free_inode = dquot_free_inode,
1027 .transfer = dquot_transfer,
617ba13b
MC		 1028 .write_dquot = ext4_write_dquot,
1029 .acquire_dquot = ext4_acquire_dquot,
1030 .release_dquot = ext4_release_dquot,
1031 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1032 .write_info = ext4_write_info,
1033 .alloc_dquot = dquot_alloc,
1034 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1035};
1036
0d54b217 1037static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1038 .quota_on = ext4_quota_on,
ac27a0ec
DK		 1039 .quota_off = vfs_quota_off,
1040 .quota_sync = vfs_quota_sync,
1041 .get_info = vfs_get_dqinfo,
1042 .set_info = vfs_set_dqinfo,
1043 .get_dqblk = vfs_get_dqblk,
1044 .set_dqblk = vfs_set_dqblk
1045};
1046#endif
1047
ee9b6d61 1048static const struct super_operations ext4_sops = {
617ba13b
MC		 1049 .alloc_inode = ext4_alloc_inode,
1050 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1051 .write_inode = ext4_write_inode,
1052 .dirty_inode = ext4_dirty_inode,
1053 .delete_inode = ext4_delete_inode,
1054 .put_super = ext4_put_super,
617ba13b 1055 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1056 .freeze_fs = ext4_freeze,
1057 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1058 .statfs = ext4_statfs,
1059 .remount_fs = ext4_remount,
1060 .clear_inode = ext4_clear_inode,
1061 .show_options = ext4_show_options,
ac27a0ec 1062#ifdef CONFIG_QUOTA
617ba13b
MC		 1063 .quota_read = ext4_quota_read,
1064 .quota_write = ext4_quota_write,
ac27a0ec 1065#endif
c39a7f84 1066 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1067};
1068
9ca92389
TT		 1069static const struct super_operations ext4_nojournal_sops = {
1070 .alloc_inode = ext4_alloc_inode,
1071 .destroy_inode = ext4_destroy_inode,
1072 .write_inode = ext4_write_inode,
1073 .dirty_inode = ext4_dirty_inode,
1074 .delete_inode = ext4_delete_inode,
1075 .write_super = ext4_write_super,
1076 .put_super = ext4_put_super,
1077 .statfs = ext4_statfs,
1078 .remount_fs = ext4_remount,
1079 .clear_inode = ext4_clear_inode,
1080 .show_options = ext4_show_options,
1081#ifdef CONFIG_QUOTA
1082 .quota_read = ext4_quota_read,
1083 .quota_write = ext4_quota_write,
1084#endif
1085 .bdev_try_to_free_page = bdev_try_to_free_page,
1086};
1087
39655164 1088static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1089 .fh_to_dentry = ext4_fh_to_dentry,
1090 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1091 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1092};
1093
1094enum {
1095 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1096 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1097 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1098 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1099 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1100 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1101 Opt_journal_update, Opt_journal_dev,
818d276c 1102 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1103 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1104 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1105 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1106 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1107 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1108 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1109 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
6fd058f7 1110 Opt_block_validity, Opt_noblock_validity,
5328e635
ES		 1111 Opt_inode_readahead_blks, Opt_journal_ioprio,
1112 Opt_discard, Opt_nodiscard,
ac27a0ec
DK		 1113};
1114
a447c093 1115static const match_table_t tokens = {
ac27a0ec
DK		 1116 {Opt_bsd_df, "bsddf"},
1117 {Opt_minix_df, "minixdf"},
1118 {Opt_grpid, "grpid"},
1119 {Opt_grpid, "bsdgroups"},
1120 {Opt_nogrpid, "nogrpid"},
1121 {Opt_nogrpid, "sysvgroups"},
1122 {Opt_resgid, "resgid=%u"},
1123 {Opt_resuid, "resuid=%u"},
1124 {Opt_sb, "sb=%u"},
1125 {Opt_err_cont, "errors=continue"},
1126 {Opt_err_panic, "errors=panic"},
1127 {Opt_err_ro, "errors=remount-ro"},
1128 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1129 {Opt_debug, "debug"},
1130 {Opt_oldalloc, "oldalloc"},
1131 {Opt_orlov, "orlov"},
1132 {Opt_user_xattr, "user_xattr"},
1133 {Opt_nouser_xattr, "nouser_xattr"},
1134 {Opt_acl, "acl"},
1135 {Opt_noacl, "noacl"},
ac27a0ec 1136 {Opt_noload, "noload"},
e3bb52ae 1137 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1138 {Opt_nobh, "nobh"},
1139 {Opt_bh, "bh"},
1140 {Opt_commit, "commit=%u"},
30773840
TT		 1141 {Opt_min_batch_time, "min_batch_time=%u"},
1142 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1143 {Opt_journal_update, "journal=update"},
ac27a0ec 1144 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1145 {Opt_journal_checksum, "journal_checksum"},
1146 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1147 {Opt_abort, "abort"},
1148 {Opt_data_journal, "data=journal"},
1149 {Opt_data_ordered, "data=ordered"},
1150 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1151 {Opt_data_err_abort, "data_err=abort"},
1152 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1153 {Opt_offusrjquota, "usrjquota="},
1154 {Opt_usrjquota, "usrjquota=%s"},
1155 {Opt_offgrpjquota, "grpjquota="},
1156 {Opt_grpjquota, "grpjquota=%s"},
1157 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1158 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1159 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1160 {Opt_grpquota, "grpquota"},
1161 {Opt_noquota, "noquota"},
1162 {Opt_quota, "quota"},
1163 {Opt_usrquota, "usrquota"},
1164 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1165 {Opt_barrier, "barrier"},
1166 {Opt_nobarrier, "nobarrier"},
25ec56b5 1167 {Opt_i_version, "i_version"},
c9de560d 1168 {Opt_stripe, "stripe=%u"},
ac27a0ec 1169 {Opt_resize, "resize"},
64769240 1170 {Opt_delalloc, "delalloc"},
dd919b98 1171 {Opt_nodelalloc, "nodelalloc"},
6fd058f7
TT		 1172 {Opt_block_validity, "block_validity"},
1173 {Opt_noblock_validity, "noblock_validity"},
240799cd 1174 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1175 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1176 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1177 {Opt_auto_da_alloc, "auto_da_alloc"},
1178 {Opt_noauto_da_alloc, "noauto_da_alloc"},
5328e635
ES		 1179 {Opt_discard, "discard"},
1180 {Opt_nodiscard, "nodiscard"},
f3f12faa 1181 {Opt_err, NULL},
ac27a0ec
DK		 1182};
1183
617ba13b 1184static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1185{
617ba13b 1186 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1187 char *options = (char *) *data;
1188
1189 if (!options || strncmp(options, "sb=", 3) != 0)
1190 return 1; /* Default location */
0b8e58a1 1191
ac27a0ec 1192 options += 3;
0b8e58a1 1193 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1194 sb_block = simple_strtoul(options, &options, 0);
1195 if (*options && *options != ',') {
4776004f 1196 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1197 (char *) *data);
1198 return 1;
1199 }
1200 if (*options == ',')
1201 options++;
1202 *data = (void *) options;
0b8e58a1 1203
ac27a0ec
DK		 1204 return sb_block;
1205}
1206
b3881f74
TT		 1207#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1208
2b2d6d01 1209static int parse_options(char *options, struct super_block *sb,
c3191067 1210 unsigned long *journal_devnum,
b3881f74 1211 unsigned int *journal_ioprio,
2b2d6d01 1212 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1213{
617ba13b 1214 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1215 char *p;
ac27a0ec
DK		 1216 substring_t args[MAX_OPT_ARGS];
1217 int data_opt = 0;
1218 int option;
1219#ifdef CONFIG_QUOTA
dfc5d03f 1220 int qtype, qfmt;
ac27a0ec
DK		 1221 char *qname;
1222#endif
1223
1224 if (!options)
1225 return 1;
1226
2b2d6d01 1227 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1228 int token;
1229 if (!*p)
1230 continue;
1231
15121c18
ES		 1232 /*
1233 * Initialize args struct so we know whether arg was
1234 * found; some options take optional arguments.
1235 */
1236 args[0].to = args[0].from = 0;
ac27a0ec
DK		 1237 token = match_token(p, tokens, args);
1238 switch (token) {
1239 case Opt_bsd_df:
2b2d6d01 1240 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1241 break;
1242 case Opt_minix_df:
2b2d6d01 1243 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1244 break;
1245 case Opt_grpid:
2b2d6d01 1246 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1247 break;
1248 case Opt_nogrpid:
2b2d6d01 1249 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1250 break;
1251 case Opt_resuid:
1252 if (match_int(&args[0], &option))
1253 return 0;
1254 sbi->s_resuid = option;
1255 break;
1256 case Opt_resgid:
1257 if (match_int(&args[0], &option))
1258 return 0;
1259 sbi->s_resgid = option;
1260 break;
1261 case Opt_sb:
1262 /* handled by get_sb_block() instead of here */
1263 /* *sb_block = match_int(&args[0]); */
1264 break;
1265 case Opt_err_panic:
2b2d6d01
TT		 1266 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1267 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1268 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1269 break;
1270 case Opt_err_ro:
2b2d6d01
TT		 1271 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1272 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1273 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1274 break;
1275 case Opt_err_cont:
2b2d6d01
TT		 1276 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1277 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1278 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1279 break;
1280 case Opt_nouid32:
2b2d6d01 1281 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1282 break;
ac27a0ec 1283 case Opt_debug:
2b2d6d01 1284 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1285 break;
1286 case Opt_oldalloc:
2b2d6d01 1287 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1288 break;
1289 case Opt_orlov:
2b2d6d01 1290 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1291 break;
03010a33 1292#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1293 case Opt_user_xattr:
2b2d6d01 1294 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1295 break;
1296 case Opt_nouser_xattr:
2b2d6d01 1297 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1298 break;
1299#else
1300 case Opt_user_xattr:
1301 case Opt_nouser_xattr:
b31e1552 1302 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1303 break;
1304#endif
03010a33 1305#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1306 case Opt_acl:
1307 set_opt(sbi->s_mount_opt, POSIX_ACL);
1308 break;
1309 case Opt_noacl:
1310 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1311 break;
1312#else
1313 case Opt_acl:
1314 case Opt_noacl:
b31e1552 1315 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1316 break;
1317#endif
ac27a0ec
DK		 1318 case Opt_journal_update:
1319 /* @@@ FIXME */
1320 /* Eventually we will want to be able to create
1321 a journal file here. For now, only allow the
1322 user to specify an existing inode to be the
1323 journal file. */
1324 if (is_remount) {
b31e1552
ES		 1325 ext4_msg(sb, KERN_ERR,
1326 "Cannot specify journal on remount");
ac27a0ec
DK		 1327 return 0;
1328 }
2b2d6d01 1329 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1330 break;
ac27a0ec
DK		 1331 case Opt_journal_dev:
1332 if (is_remount) {
b31e1552
ES		 1333 ext4_msg(sb, KERN_ERR,
1334 "Cannot specify journal on remount");
ac27a0ec
DK		 1335 return 0;
1336 }
1337 if (match_int(&args[0], &option))
1338 return 0;
1339 *journal_devnum = option;
1340 break;
818d276c 1341 case Opt_journal_checksum:
d4da6c9c
LT		 1342 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1343 break;
818d276c
GS		 1344 case Opt_journal_async_commit:
1345 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
d4da6c9c 1346 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
818d276c 1347 break;
ac27a0ec 1348 case Opt_noload:
2b2d6d01 1349 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1350 break;
1351 case Opt_commit:
1352 if (match_int(&args[0], &option))
1353 return 0;
1354 if (option < 0)
1355 return 0;
1356 if (option == 0)
cd02ff0b 1357 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1358 sbi->s_commit_interval = HZ * option;
1359 break;
30773840
TT		 1360 case Opt_max_batch_time:
1361 if (match_int(&args[0], &option))
1362 return 0;
1363 if (option < 0)
1364 return 0;
1365 if (option == 0)
1366 option = EXT4_DEF_MAX_BATCH_TIME;
1367 sbi->s_max_batch_time = option;
1368 break;
1369 case Opt_min_batch_time:
1370 if (match_int(&args[0], &option))
1371 return 0;
1372 if (option < 0)
1373 return 0;
1374 sbi->s_min_batch_time = option;
1375 break;
ac27a0ec 1376 case Opt_data_journal:
617ba13b 1377 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1378 goto datacheck;
1379 case Opt_data_ordered:
617ba13b 1380 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1381 goto datacheck;
1382 case Opt_data_writeback:
617ba13b 1383 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1384 datacheck:
1385 if (is_remount) {
617ba13b 1386 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec 1387 != data_opt) {
b31e1552
ES		 1388 ext4_msg(sb, KERN_ERR,
1389 "Cannot change data mode on remount");
ac27a0ec
DK		 1390 return 0;
1391 }
1392 } else {
617ba13b 1393 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1394 sbi->s_mount_opt |= data_opt;
1395 }
1396 break;
5bf5683a
HK		 1397 case Opt_data_err_abort:
1398 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1399 break;
1400 case Opt_data_err_ignore:
1401 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1402 break;
ac27a0ec
DK		 1403#ifdef CONFIG_QUOTA
1404 case Opt_usrjquota:
1405 qtype = USRQUOTA;
1406 goto set_qf_name;
1407 case Opt_grpjquota:
1408 qtype = GRPQUOTA;
1409set_qf_name:
17bd13b3 1410 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1411 !sbi->s_qf_names[qtype]) {
b31e1552
ES		 1412 ext4_msg(sb, KERN_ERR,
1413 "Cannot change journaled "
1414 "quota options when quota turned on");
ac27a0ec
DK		 1415 return 0;
1416 }
1417 qname = match_strdup(&args[0]);
1418 if (!qname) {
b31e1552
ES		 1419 ext4_msg(sb, KERN_ERR,
1420 "Not enough memory for "
1421 "storing quotafile name");
ac27a0ec
DK		 1422 return 0;
1423 }
1424 if (sbi->s_qf_names[qtype] &&
1425 strcmp(sbi->s_qf_names[qtype], qname)) {
b31e1552
ES		 1426 ext4_msg(sb, KERN_ERR,
1427 "%s quota file already "
1428 "specified", QTYPE2NAME(qtype));
ac27a0ec
DK		 1429 kfree(qname);
1430 return 0;
1431 }
1432 sbi->s_qf_names[qtype] = qname;
1433 if (strchr(sbi->s_qf_names[qtype], '/')) {
b31e1552
ES		 1434 ext4_msg(sb, KERN_ERR,
1435 "quotafile must be on "
1436 "filesystem root");
ac27a0ec
DK		 1437 kfree(sbi->s_qf_names[qtype]);
1438 sbi->s_qf_names[qtype] = NULL;
1439 return 0;
1440 }
1441 set_opt(sbi->s_mount_opt, QUOTA);
1442 break;
1443 case Opt_offusrjquota:
1444 qtype = USRQUOTA;
1445 goto clear_qf_name;
1446 case Opt_offgrpjquota:
1447 qtype = GRPQUOTA;
1448clear_qf_name:
17bd13b3 1449 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1450 sbi->s_qf_names[qtype]) {
b31e1552 1451 ext4_msg(sb, KERN_ERR, "Cannot change "
2c8be6b2 1452 "journaled quota options when "
b31e1552 1453 "quota turned on");
ac27a0ec
DK		 1454 return 0;
1455 }
1456 /*
1457 * The space will be released later when all options
1458 * are confirmed to be correct
1459 */
1460 sbi->s_qf_names[qtype] = NULL;
1461 break;
1462 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1463 qfmt = QFMT_VFS_OLD;
1464 goto set_qf_format;
ac27a0ec 1465 case Opt_jqfmt_vfsv0:
dfc5d03f 1466 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1467 goto set_qf_format;
1468 case Opt_jqfmt_vfsv1:
1469 qfmt = QFMT_VFS_V1;
dfc5d03f 1470set_qf_format:
17bd13b3 1471 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1472 sbi->s_jquota_fmt != qfmt) {
b31e1552 1473 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1474 "journaled quota options when "
b31e1552 1475 "quota turned on");
dfc5d03f
JK		 1476 return 0;
1477 }
1478 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1479 break;
1480 case Opt_quota:
1481 case Opt_usrquota:
1482 set_opt(sbi->s_mount_opt, QUOTA);
1483 set_opt(sbi->s_mount_opt, USRQUOTA);
1484 break;
1485 case Opt_grpquota:
1486 set_opt(sbi->s_mount_opt, QUOTA);
1487 set_opt(sbi->s_mount_opt, GRPQUOTA);
1488 break;
1489 case Opt_noquota:
17bd13b3 1490 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1491 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1492 "options when quota turned on");
ac27a0ec
DK		 1493 return 0;
1494 }
1495 clear_opt(sbi->s_mount_opt, QUOTA);
1496 clear_opt(sbi->s_mount_opt, USRQUOTA);
1497 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1498 break;
1499#else
1500 case Opt_quota:
1501 case Opt_usrquota:
1502 case Opt_grpquota:
b31e1552
ES		 1503 ext4_msg(sb, KERN_ERR,
1504 "quota options not supported");
cd59e7b9 1505 break;
ac27a0ec
DK		 1506 case Opt_usrjquota:
1507 case Opt_grpjquota:
1508 case Opt_offusrjquota:
1509 case Opt_offgrpjquota:
1510 case Opt_jqfmt_vfsold:
1511 case Opt_jqfmt_vfsv0:
5a20bdfc 1512 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1513 ext4_msg(sb, KERN_ERR,
1514 "journaled quota options not supported");
ac27a0ec
DK		 1515 break;
1516 case Opt_noquota:
1517 break;
1518#endif
1519 case Opt_abort:
4ab2f15b 1520 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1521 break;
06705bff
TT		 1522 case Opt_nobarrier:
1523 clear_opt(sbi->s_mount_opt, BARRIER);
1524 break;
ac27a0ec 1525 case Opt_barrier:
15121c18
ES		 1526 if (args[0].from) {
1527 if (match_int(&args[0], &option))
1528 return 0;
1529 } else
1530 option = 1; /* No argument, default to 1 */
ac27a0ec
DK		 1531 if (option)
1532 set_opt(sbi->s_mount_opt, BARRIER);
1533 else
1534 clear_opt(sbi->s_mount_opt, BARRIER);
1535 break;
1536 case Opt_ignore:
1537 break;
1538 case Opt_resize:
1539 if (!is_remount) {
b31e1552
ES		 1540 ext4_msg(sb, KERN_ERR,
1541 "resize option only available "
1542 "for remount");
ac27a0ec
DK		 1543 return 0;
1544 }
1545 if (match_int(&args[0], &option) != 0)
1546 return 0;
1547 *n_blocks_count = option;
1548 break;
1549 case Opt_nobh:
1550 set_opt(sbi->s_mount_opt, NOBH);
1551 break;
1552 case Opt_bh:
1553 clear_opt(sbi->s_mount_opt, NOBH);
1554 break;
25ec56b5
JNC		 1555 case Opt_i_version:
1556 set_opt(sbi->s_mount_opt, I_VERSION);
1557 sb->s_flags |= MS_I_VERSION;
1558 break;
dd919b98
AK		 1559 case Opt_nodelalloc:
1560 clear_opt(sbi->s_mount_opt, DELALLOC);
1561 break;
c9de560d
AT		 1562 case Opt_stripe:
1563 if (match_int(&args[0], &option))
1564 return 0;
1565 if (option < 0)
1566 return 0;
1567 sbi->s_stripe = option;
1568 break;
64769240
AT		 1569 case Opt_delalloc:
1570 set_opt(sbi->s_mount_opt, DELALLOC);
1571 break;
6fd058f7
TT		 1572 case Opt_block_validity:
1573 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1574 break;
1575 case Opt_noblock_validity:
1576 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1577 break;
240799cd
TT		 1578 case Opt_inode_readahead_blks:
1579 if (match_int(&args[0], &option))
1580 return 0;
1581 if (option < 0 || option > (1 << 30))
1582 return 0;
f7c43950 1583 if (!is_power_of_2(option)) {
b31e1552
ES		 1584 ext4_msg(sb, KERN_ERR,
1585 "EXT4-fs: inode_readahead_blks"
1586 " must be a power of 2");
3197ebdb
TT		 1587 return 0;
1588 }
240799cd
TT		 1589 sbi->s_inode_readahead_blks = option;
1590 break;
b3881f74
TT		 1591 case Opt_journal_ioprio:
1592 if (match_int(&args[0], &option))
1593 return 0;
1594 if (option < 0 || option > 7)
1595 break;
1596 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1597 option);
1598 break;
06705bff
TT		 1599 case Opt_noauto_da_alloc:
1600 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1601 break;
afd4672d 1602 case Opt_auto_da_alloc:
15121c18
ES		 1603 if (args[0].from) {
1604 if (match_int(&args[0], &option))
1605 return 0;
1606 } else
1607 option = 1; /* No argument, default to 1 */
afd4672d
TT		 1608 if (option)
1609 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1610 else
1611 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1612 break;
5328e635
ES		 1613 case Opt_discard:
1614 set_opt(sbi->s_mount_opt, DISCARD);
1615 break;
1616 case Opt_nodiscard:
1617 clear_opt(sbi->s_mount_opt, DISCARD);
1618 break;
ac27a0ec 1619 default:
b31e1552
ES		 1620 ext4_msg(sb, KERN_ERR,
1621 "Unrecognized mount option \"%s\" "
1622 "or missing value", p);
ac27a0ec
DK		 1623 return 0;
1624 }
1625 }
1626#ifdef CONFIG_QUOTA
1627 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1628 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1629 sbi->s_qf_names[USRQUOTA])
1630 clear_opt(sbi->s_mount_opt, USRQUOTA);
1631
617ba13b 1632 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1633 sbi->s_qf_names[GRPQUOTA])
1634 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1635
1636 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1637 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1638 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b 1639 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
b31e1552
ES		 1640 ext4_msg(sb, KERN_ERR, "old and new quota "
1641 "format mixing");
ac27a0ec
DK		 1642 return 0;
1643 }
1644
1645 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1646 ext4_msg(sb, KERN_ERR, "journaled quota format "
1647 "not specified");
ac27a0ec
DK		 1648 return 0;
1649 }
1650 } else {
1651 if (sbi->s_jquota_fmt) {
b31e1552 1652 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1653 "specified with no journaling "
b31e1552 1654 "enabled");
ac27a0ec
DK		 1655 return 0;
1656 }
1657 }
1658#endif
1659 return 1;
1660}
1661
617ba13b 1662static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1663 int read_only)
1664{
617ba13b 1665 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1666 int res = 0;
1667
617ba13b 1668 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1669 ext4_msg(sb, KERN_ERR, "revision level too high, "
1670 "forcing read-only mode");
ac27a0ec
DK		 1671 res = MS_RDONLY;
1672 }
1673 if (read_only)
1674 return res;
617ba13b 1675 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1676 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1677 "running e2fsck is recommended");
617ba13b 1678 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1679 ext4_msg(sb, KERN_WARNING,
1680 "warning: mounting fs with errors, "
1681 "running e2fsck is recommended");
ac27a0ec
DK		 1682 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1683 le16_to_cpu(es->s_mnt_count) >=
1684 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1685 ext4_msg(sb, KERN_WARNING,
1686 "warning: maximal mount count reached, "
1687 "running e2fsck is recommended");
ac27a0ec
DK		 1688 else if (le32_to_cpu(es->s_checkinterval) &&
1689 (le32_to_cpu(es->s_lastcheck) +
1690 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1691 ext4_msg(sb, KERN_WARNING,
1692 "warning: checktime reached, "
1693 "running e2fsck is recommended");
0b8e58a1 1694 if (!sbi->s_journal)
0390131b 1695 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1696 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1697 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1698 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1699 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1700 ext4_update_dynamic_rev(sb);
0390131b
FM		 1701 if (sbi->s_journal)
1702 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1703
e2d67052 1704 ext4_commit_super(sb, 1);
ac27a0ec 1705 if (test_opt(sb, DEBUG))
a9df9a49 1706 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
7f4520cc 1707 "bpg=%lu, ipg=%lu, mo=%04x]\n",
ac27a0ec
DK		 1708 sb->s_blocksize,
1709 sbi->s_groups_count,
617ba13b
MC		 1710 EXT4_BLOCKS_PER_GROUP(sb),
1711 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1712 sbi->s_mount_opt);
1713
ac27a0ec
DK		 1714 return res;
1715}
1716
772cb7c8
JS		 1717static int ext4_fill_flex_info(struct super_block *sb)
1718{
1719 struct ext4_sb_info *sbi = EXT4_SB(sb);
1720 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1721 ext4_group_t flex_group_count;
1722 ext4_group_t flex_group;
1723 int groups_per_flex = 0;
c5ca7c76 1724 size_t size;
772cb7c8
JS		 1725 int i;
1726
503358ae
TT		 1727 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1728 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1729
1730 if (groups_per_flex < 2) {
772cb7c8
JS		 1731 sbi->s_log_groups_per_flex = 0;
1732 return 1;
1733 }
1734
c62a11fd
FB		 1735 /* We allocate both existing and potentially added groups */
1736 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1737 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1738 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1739 size = flex_group_count * sizeof(struct flex_groups);
1740 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1741 if (sbi->s_flex_groups == NULL) {
1742 sbi->s_flex_groups = vmalloc(size);
1743 if (sbi->s_flex_groups)
1744 memset(sbi->s_flex_groups, 0, size);
1745 }
772cb7c8 1746 if (sbi->s_flex_groups == NULL) {
b31e1552
ES		 1747 ext4_msg(sb, KERN_ERR, "not enough memory for "
1748 "%u flex groups", flex_group_count);
772cb7c8
JS		 1749 goto failed;
1750 }
772cb7c8 1751
772cb7c8 1752 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1753 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1754
1755 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1756 atomic_add(ext4_free_inodes_count(sb, gdp),
1757 &sbi->s_flex_groups[flex_group].free_inodes);
1758 atomic_add(ext4_free_blks_count(sb, gdp),
1759 &sbi->s_flex_groups[flex_group].free_blocks);
1760 atomic_add(ext4_used_dirs_count(sb, gdp),
1761 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1762 }
1763
1764 return 1;
1765failed:
1766 return 0;
1767}
1768
717d50e4
AD		 1769__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1770 struct ext4_group_desc *gdp)
1771{
1772 __u16 crc = 0;
1773
1774 if (sbi->s_es->s_feature_ro_compat &
1775 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1776 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1777 __le32 le_group = cpu_to_le32(block_group);
1778
1779 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1780 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1781 crc = crc16(crc, (__u8 *)gdp, offset);
1782 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1783 /* for checksum of struct ext4_group_desc do the rest...*/
1784 if ((sbi->s_es->s_feature_incompat &
1785 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1786 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1787 crc = crc16(crc, (__u8 *)gdp + offset,
1788 le16_to_cpu(sbi->s_es->s_desc_size) -
1789 offset);
1790 }
1791
1792 return cpu_to_le16(crc);
1793}
1794
1795int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1796 struct ext4_group_desc *gdp)
1797{
1798 if ((sbi->s_es->s_feature_ro_compat &
1799 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1800 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1801 return 0;
1802
1803 return 1;
1804}
1805
ac27a0ec 1806/* Called at mount-time, super-block is locked */
197cd65a 1807static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1808{
617ba13b
MC		 1809 struct ext4_sb_info *sbi = EXT4_SB(sb);
1810 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1811 ext4_fsblk_t last_block;
bd81d8ee
LV		 1812 ext4_fsblk_t block_bitmap;
1813 ext4_fsblk_t inode_bitmap;
1814 ext4_fsblk_t inode_table;
ce421581 1815 int flexbg_flag = 0;
fd2d4291 1816 ext4_group_t i;
ac27a0ec 1817
ce421581
JS		 1818 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1819 flexbg_flag = 1;
1820
af5bc92d 1821 ext4_debug("Checking group descriptors");
ac27a0ec 1822
197cd65a
AM		 1823 for (i = 0; i < sbi->s_groups_count; i++) {
1824 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1825
ce421581 1826 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1827 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1828 else
1829 last_block = first_block +
617ba13b 1830 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1831
8fadc143 1832 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1833 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1834 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1835 "Block bitmap for group %u not in group "
b31e1552 1836 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1837 return 0;
1838 }
8fadc143 1839 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1840 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1841 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1842 "Inode bitmap for group %u not in group "
b31e1552 1843 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1844 return 0;
1845 }
8fadc143 1846 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1847 if (inode_table < first_block ||
2b2d6d01 1848 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1849 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1850 "Inode table for group %u not in group "
b31e1552 1851 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1852 return 0;
1853 }
955ce5f5 1854 ext4_lock_group(sb, i);
717d50e4 1855 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1856 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1857 "Checksum for group %u failed (%u!=%u)",
1858 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1859 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1860 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1861 ext4_unlock_group(sb, i);
8a266467 1862 return 0;
7ee1ec4c 1863 }
717d50e4 1864 }
955ce5f5 1865 ext4_unlock_group(sb, i);
ce421581
JS		 1866 if (!flexbg_flag)
1867 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1868 }
1869
bd81d8ee 1870 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 1871 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1872 return 1;
1873}
1874
617ba13b 1875/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1876 * the superblock) which were deleted from all directories, but held open by
1877 * a process at the time of a crash. We walk the list and try to delete these
1878 * inodes at recovery time (only with a read-write filesystem).
1879 *
1880 * In order to keep the orphan inode chain consistent during traversal (in
1881 * case of crash during recovery), we link each inode into the superblock
1882 * orphan list_head and handle it the same way as an inode deletion during
1883 * normal operation (which journals the operations for us).
1884 *
1885 * We only do an iget() and an iput() on each inode, which is very safe if we
1886 * accidentally point at an in-use or already deleted inode. The worst that
1887 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1888 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1889 * e2fsck was run on this filesystem, and it must have already done the orphan
1890 * inode cleanup for us, so we can safely abort without any further action.
1891 */
2b2d6d01
TT		 1892static void ext4_orphan_cleanup(struct super_block *sb,
1893 struct ext4_super_block *es)
ac27a0ec
DK		 1894{
1895 unsigned int s_flags = sb->s_flags;
1896 int nr_orphans = 0, nr_truncates = 0;
1897#ifdef CONFIG_QUOTA
1898 int i;
1899#endif
1900 if (!es->s_last_orphan) {
1901 jbd_debug(4, "no orphan inodes to clean up\n");
1902 return;
1903 }
1904
a8f48a95 1905 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 1906 ext4_msg(sb, KERN_ERR, "write access "
1907 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 1908 return;
1909 }
1910
617ba13b 1911 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1912 if (es->s_last_orphan)
1913 jbd_debug(1, "Errors on filesystem, "
1914 "clearing orphan list.\n");
1915 es->s_last_orphan = 0;
1916 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1917 return;
1918 }
1919
1920 if (s_flags & MS_RDONLY) {
b31e1552 1921 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 1922 sb->s_flags &= ~MS_RDONLY;
1923 }
1924#ifdef CONFIG_QUOTA
1925 /* Needed for iput() to work correctly and not trash data */
1926 sb->s_flags |= MS_ACTIVE;
1927 /* Turn on quotas so that they are updated correctly */
1928 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1929 if (EXT4_SB(sb)->s_qf_names[i]) {
1930 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 1931 if (ret < 0)
b31e1552
ES		 1932 ext4_msg(sb, KERN_ERR,
1933 "Cannot turn on journaled "
1934 "quota: error %d", ret);
ac27a0ec
DK		 1935 }
1936 }
1937#endif
1938
1939 while (es->s_last_orphan) {
1940 struct inode *inode;
1941
97bd42b9
JB		 1942 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1943 if (IS_ERR(inode)) {
ac27a0ec
DK		 1944 es->s_last_orphan = 0;
1945 break;
1946 }
1947
617ba13b 1948 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
a269eb18 1949 vfs_dq_init(inode);
ac27a0ec 1950 if (inode->i_nlink) {
b31e1552
ES		 1951 ext4_msg(sb, KERN_DEBUG,
1952 "%s: truncating inode %lu to %lld bytes",
46e665e9 1953 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1954 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1955 inode->i_ino, inode->i_size);
617ba13b 1956 ext4_truncate(inode);
ac27a0ec
DK		 1957 nr_truncates++;
1958 } else {
b31e1552
ES		 1959 ext4_msg(sb, KERN_DEBUG,
1960 "%s: deleting unreferenced inode %lu",
46e665e9 1961 __func__, inode->i_ino);
ac27a0ec
DK		 1962 jbd_debug(2, "deleting unreferenced inode %lu\n",
1963 inode->i_ino);
1964 nr_orphans++;
1965 }
1966 iput(inode); /* The delete magic happens here! */
1967 }
1968
2b2d6d01 1969#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1970
1971 if (nr_orphans)
b31e1552
ES		 1972 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1973 PLURAL(nr_orphans));
ac27a0ec 1974 if (nr_truncates)
b31e1552
ES		 1975 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1976 PLURAL(nr_truncates));
ac27a0ec
DK		 1977#ifdef CONFIG_QUOTA
1978 /* Turn quotas off */
1979 for (i = 0; i < MAXQUOTAS; i++) {
1980 if (sb_dqopt(sb)->files[i])
6f28e087 1981 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1982 }
1983#endif
1984 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1985}
0b8e58a1 1986
cd2291a4
ES		 1987/*
1988 * Maximal extent format file size.
1989 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1990 * extent format containers, within a sector_t, and within i_blocks
1991 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1992 * so that won't be a limiting factor.
1993 *
1994 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1995 */
f287a1a5 1996static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1997{
1998 loff_t res;
1999 loff_t upper_limit = MAX_LFS_FILESIZE;
2000
2001 /* small i_blocks in vfs inode? */
f287a1a5 2002 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2003 /*
90c699a9 2004 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2005 * i_block represent total blocks in 512 bytes
2006 * 32 == size of vfs inode i_blocks * 8
2007 */
2008 upper_limit = (1LL << 32) - 1;
2009
2010 /* total blocks in file system block size */
2011 upper_limit >>= (blkbits - 9);
2012 upper_limit <<= blkbits;
2013 }
2014
2015 /* 32-bit extent-start container, ee_block */
2016 res = 1LL << 32;
2017 res <<= blkbits;
2018 res -= 1;
2019
2020 /* Sanity check against vm- & vfs- imposed limits */
2021 if (res > upper_limit)
2022 res = upper_limit;
2023
2024 return res;
2025}
ac27a0ec 2026
ac27a0ec 2027/*
cd2291a4 2028 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2029 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2030 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2031 */
f287a1a5 2032static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2033{
617ba13b 2034 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2035 int meta_blocks;
2036 loff_t upper_limit;
0b8e58a1
AD		 2037 /* This is calculated to be the largest file size for a dense, block
2038 * mapped file such that the file's total number of 512-byte sectors,
2039 * including data and all indirect blocks, does not exceed (2^48 - 1).
2040 *
2041 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2042 * number of 512-byte sectors of the file.
0fc1b451
AK		 2043 */
2044
f287a1a5 2045 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2046 /*
90c699a9 2047 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2048 * the inode i_block field represents total file blocks in
2049 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2050 */
2051 upper_limit = (1LL << 32) - 1;
2052
2053 /* total blocks in file system block size */
2054 upper_limit >>= (bits - 9);
2055
2056 } else {
8180a562
AK		 2057 /*
2058 * We use 48 bit ext4_inode i_blocks
2059 * With EXT4_HUGE_FILE_FL set the i_blocks
2060 * represent total number of blocks in
2061 * file system block size
2062 */
0fc1b451
AK		 2063 upper_limit = (1LL << 48) - 1;
2064
0fc1b451
AK		 2065 }
2066
2067 /* indirect blocks */
2068 meta_blocks = 1;
2069 /* double indirect blocks */
2070 meta_blocks += 1 + (1LL << (bits-2));
2071 /* tripple indirect blocks */
2072 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2073
2074 upper_limit -= meta_blocks;
2075 upper_limit <<= bits;
ac27a0ec
DK		 2076
2077 res += 1LL << (bits-2);
2078 res += 1LL << (2*(bits-2));
2079 res += 1LL << (3*(bits-2));
2080 res <<= bits;
2081 if (res > upper_limit)
2082 res = upper_limit;
0fc1b451
AK		 2083
2084 if (res > MAX_LFS_FILESIZE)
2085 res = MAX_LFS_FILESIZE;
2086
ac27a0ec
DK		 2087 return res;
2088}
2089
617ba13b 2090static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2091 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2092{
617ba13b 2093 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2094 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2095 int has_super = 0;
2096
2097 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2098
617ba13b 2099 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2100 nr < first_meta_bg)
70bbb3e0 2101 return logical_sb_block + nr + 1;
ac27a0ec 2102 bg = sbi->s_desc_per_block * nr;
617ba13b 2103 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2104 has_super = 1;
0b8e58a1 2105
617ba13b 2106 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2107}
2108
c9de560d
AT		 2109/**
2110 * ext4_get_stripe_size: Get the stripe size.
2111 * @sbi: In memory super block info
2112 *
2113 * If we have specified it via mount option, then
2114 * use the mount option value. If the value specified at mount time is
2115 * greater than the blocks per group use the super block value.
2116 * If the super block value is greater than blocks per group return 0.
2117 * Allocator needs it be less than blocks per group.
2118 *
2119 */
2120static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2121{
2122 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2123 unsigned long stripe_width =
2124 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2125
2126 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2127 return sbi->s_stripe;
2128
2129 if (stripe_width <= sbi->s_blocks_per_group)
2130 return stripe_width;
2131
2132 if (stride <= sbi->s_blocks_per_group)
2133 return stride;
2134
2135 return 0;
2136}
ac27a0ec 2137
3197ebdb
TT		 2138/* sysfs supprt */
2139
2140struct ext4_attr {
2141 struct attribute attr;
2142 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2143 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2144 const char *, size_t);
2145 int offset;
2146};
2147
2148static int parse_strtoul(const char *buf,
2149 unsigned long max, unsigned long *value)
2150{
2151 char *endp;
2152
e7d2860b
AGR		 2153 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2154 endp = skip_spaces(endp);
3197ebdb
TT		 2155 if (*endp || *value > max)
2156 return -EINVAL;
2157
2158 return 0;
2159}
2160
2161static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2162 struct ext4_sb_info *sbi,
2163 char *buf)
2164{
2165 return snprintf(buf, PAGE_SIZE, "%llu\n",
2166 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2167}
2168
2169static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2170 struct ext4_sb_info *sbi, char *buf)
2171{
2172 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2173
2174 return snprintf(buf, PAGE_SIZE, "%lu\n",
2175 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2176 sbi->s_sectors_written_start) >> 1);
2177}
2178
2179static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2180 struct ext4_sb_info *sbi, char *buf)
2181{
2182 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2183
2184 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2185 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2186 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2187 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2188}
2189
2190static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2191 struct ext4_sb_info *sbi,
2192 const char *buf, size_t count)
2193{
2194 unsigned long t;
2195
2196 if (parse_strtoul(buf, 0x40000000, &t))
2197 return -EINVAL;
2198
f7c43950 2199 if (!is_power_of_2(t))
3197ebdb
TT		 2200 return -EINVAL;
2201
2202 sbi->s_inode_readahead_blks = t;
2203 return count;
2204}
2205
2206static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2207 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2208{
2209 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2210
2211 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2212}
2213
2214static ssize_t sbi_ui_store(struct ext4_attr *a,
2215 struct ext4_sb_info *sbi,
2216 const char *buf, size_t count)
2217{
2218 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2219 unsigned long t;
2220
2221 if (parse_strtoul(buf, 0xffffffff, &t))
2222 return -EINVAL;
2223 *ui = t;
2224 return count;
2225}
2226
2227#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2228static struct ext4_attr ext4_attr_##_name = { \
2229 .attr = {.name = __stringify(_name), .mode = _mode }, \
2230 .show = _show, \
2231 .store = _store, \
2232 .offset = offsetof(struct ext4_sb_info, _elname), \
2233}
2234#define EXT4_ATTR(name, mode, show, store) \
2235static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2236
2237#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2238#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2239#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2240 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2241#define ATTR_LIST(name) &ext4_attr_##name.attr
2242
2243EXT4_RO_ATTR(delayed_allocation_blocks);
2244EXT4_RO_ATTR(session_write_kbytes);
2245EXT4_RO_ATTR(lifetime_write_kbytes);
2246EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2247 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2248EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2249EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2250EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2251EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2252EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2253EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2254EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2255EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2256
2257static struct attribute *ext4_attrs[] = {
2258 ATTR_LIST(delayed_allocation_blocks),
2259 ATTR_LIST(session_write_kbytes),
2260 ATTR_LIST(lifetime_write_kbytes),
2261 ATTR_LIST(inode_readahead_blks),
11013911 2262 ATTR_LIST(inode_goal),
3197ebdb
TT		 2263 ATTR_LIST(mb_stats),
2264 ATTR_LIST(mb_max_to_scan),
2265 ATTR_LIST(mb_min_to_scan),
2266 ATTR_LIST(mb_order2_req),
2267 ATTR_LIST(mb_stream_req),
2268 ATTR_LIST(mb_group_prealloc),
55138e0b 2269 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2270 NULL,
2271};
2272
2273static ssize_t ext4_attr_show(struct kobject *kobj,
2274 struct attribute *attr, char *buf)
2275{
2276 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2277 s_kobj);
2278 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2279
2280 return a->show ? a->show(a, sbi, buf) : 0;
2281}
2282
2283static ssize_t ext4_attr_store(struct kobject *kobj,
2284 struct attribute *attr,
2285 const char *buf, size_t len)
2286{
2287 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2288 s_kobj);
2289 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2290
2291 return a->store ? a->store(a, sbi, buf, len) : 0;
2292}
2293
2294static void ext4_sb_release(struct kobject *kobj)
2295{
2296 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2297 s_kobj);
2298 complete(&sbi->s_kobj_unregister);
2299}
2300
2301
2302static struct sysfs_ops ext4_attr_ops = {
2303 .show = ext4_attr_show,
2304 .store = ext4_attr_store,
2305};
2306
2307static struct kobj_type ext4_ktype = {
2308 .default_attrs = ext4_attrs,
2309 .sysfs_ops = &ext4_attr_ops,
2310 .release = ext4_sb_release,
2311};
2312
a13fb1a4
ES		 2313/*
2314 * Check whether this filesystem can be mounted based on
2315 * the features present and the RDONLY/RDWR mount requested.
2316 * Returns 1 if this filesystem can be mounted as requested,
2317 * 0 if it cannot be.
2318 */
2319static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2320{
2321 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2322 ext4_msg(sb, KERN_ERR,
2323 "Couldn't mount because of "
2324 "unsupported optional features (%x)",
2325 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2326 ~EXT4_FEATURE_INCOMPAT_SUPP));
2327 return 0;
2328 }
2329
2330 if (readonly)
2331 return 1;
2332
2333 /* Check that feature set is OK for a read-write mount */
2334 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2335 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2336 "unsupported optional features (%x)",
2337 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2338 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2339 return 0;
2340 }
2341 /*
2342 * Large file size enabled file system can only be mounted
2343 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2344 */
2345 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2346 if (sizeof(blkcnt_t) < sizeof(u64)) {
2347 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2348 "cannot be mounted RDWR without "
2349 "CONFIG_LBDAF");
2350 return 0;
2351 }
2352 }
2353 return 1;
2354}
2355
2b2d6d01 2356static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2357 __releases(kernel_lock)
2358 __acquires(kernel_lock)
ac27a0ec 2359{
2b2d6d01 2360 struct buffer_head *bh;
617ba13b
MC		 2361 struct ext4_super_block *es = NULL;
2362 struct ext4_sb_info *sbi;
2363 ext4_fsblk_t block;
2364 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2365 ext4_fsblk_t logical_sb_block;
ac27a0ec 2366 unsigned long offset = 0;
ac27a0ec
DK		 2367 unsigned long journal_devnum = 0;
2368 unsigned long def_mount_opts;
2369 struct inode *root;
9f6200bb 2370 char *cp;
0390131b 2371 const char *descr;
1d1fe1ee 2372 int ret = -EINVAL;
ac27a0ec 2373 int blocksize;
4ec11028
TT		 2374 unsigned int db_count;
2375 unsigned int i;
f287a1a5 2376 int needs_recovery, has_huge_files;
bd81d8ee 2377 __u64 blocks_count;
833f4077 2378 int err;
b3881f74 2379 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2380
2381 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2382 if (!sbi)
2383 return -ENOMEM;
705895b6
PE		 2384
2385 sbi->s_blockgroup_lock =
2386 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2387 if (!sbi->s_blockgroup_lock) {
2388 kfree(sbi);
2389 return -ENOMEM;
2390 }
ac27a0ec
DK		 2391 sb->s_fs_info = sbi;
2392 sbi->s_mount_opt = 0;
617ba13b
MC		 2393 sbi->s_resuid = EXT4_DEF_RESUID;
2394 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2395 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2396 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2397 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2398 sectors[1]);
ac27a0ec
DK		 2399
2400 unlock_kernel();
2401
9f6200bb
TT		 2402 /* Cleanup superblock name */
2403 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2404 *cp = '!';
2405
617ba13b 2406 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2407 if (!blocksize) {
b31e1552 2408 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2409 goto out_fail;
2410 }
2411
2412 /*
617ba13b 2413 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2414 * block sizes. We need to calculate the offset from buffer start.
2415 */
617ba13b 2416 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2417 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2418 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2419 } else {
70bbb3e0 2420 logical_sb_block = sb_block;
ac27a0ec
DK		 2421 }
2422
70bbb3e0 2423 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 2424 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 2425 goto out_fail;
2426 }
2427 /*
2428 * Note: s_es must be initialized as soon as possible because
617ba13b 2429 * some ext4 macro-instructions depend on its value
ac27a0ec 2430 */
617ba13b 2431 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2432 sbi->s_es = es;
2433 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2434 if (sb->s_magic != EXT4_SUPER_MAGIC)
2435 goto cantfind_ext4;
afc32f7e 2436 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2437
2438 /* Set defaults before we parse the mount options */
2439 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2440 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2441 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2442 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2443 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2444 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2445 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2446#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2447 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2448 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2449#endif
03010a33 2450#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2451 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2452 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2453#endif
617ba13b
MC		 2454 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2455 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2456 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2457 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2458 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2459 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2460
2461 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2462 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2463 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2464 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2465 else
2466 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2467
2468 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2469 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2470 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2471 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2472 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2473
571640ca 2474 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2475
dd919b98
AK		 2476 /*
2477 * enable delayed allocation by default
2478 * Use -o nodelalloc to turn it off
2479 */
2480 set_opt(sbi->s_mount_opt, DELALLOC);
2481
b3881f74
TT		 2482 if (!parse_options((char *) data, sb, &journal_devnum,
2483 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2484 goto failed_mount;
2485
2486 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2487 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2488
617ba13b
MC		 2489 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2490 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2491 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2492 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 2493 ext4_msg(sb, KERN_WARNING,
2494 "feature flags set on rev 0 fs, "
2495 "running e2fsck is recommended");
469108ff 2496
ac27a0ec
DK		 2497 /*
2498 * Check feature flags regardless of the revision level, since we
2499 * previously didn't change the revision level when setting the flags,
2500 * so there is a chance incompat flags are set on a rev 0 filesystem.
2501 */
a13fb1a4 2502 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 2503 goto failed_mount;
a13fb1a4 2504
ac27a0ec
DK		 2505 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2506
617ba13b
MC		 2507 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2508 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 2509 ext4_msg(sb, KERN_ERR,
2510 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 2511 goto failed_mount;
2512 }
2513
ac27a0ec 2514 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2515 /* Validate the filesystem blocksize */
2516 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 2517 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 2518 blocksize);
ac27a0ec
DK		 2519 goto failed_mount;
2520 }
2521
2b2d6d01 2522 brelse(bh);
70bbb3e0
AM		 2523 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2524 offset = do_div(logical_sb_block, blocksize);
2525 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 2526 if (!bh) {
b31e1552
ES		 2527 ext4_msg(sb, KERN_ERR,
2528 "Can't read superblock on 2nd try");
ac27a0ec
DK		 2529 goto failed_mount;
2530 }
617ba13b 2531 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2532 sbi->s_es = es;
617ba13b 2533 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 2534 ext4_msg(sb, KERN_ERR,
2535 "Magic mismatch, very weird!");
ac27a0ec
DK		 2536 goto failed_mount;
2537 }
2538 }
2539
a13fb1a4
ES		 2540 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2541 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 2542 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2543 has_huge_files);
2544 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2545
617ba13b
MC		 2546 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2547 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2548 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2549 } else {
2550 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2551 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2552 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2553 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2554 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 2555 ext4_msg(sb, KERN_ERR,
2556 "unsupported inode size: %d",
2b2d6d01 2557 sbi->s_inode_size);
ac27a0ec
DK		 2558 goto failed_mount;
2559 }
ef7f3835
KS		 2560 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2561 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2562 }
0b8e58a1 2563
0d1ee42f
AR		 2564 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2565 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2566 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2567 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2568 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 2569 ext4_msg(sb, KERN_ERR,
2570 "unsupported descriptor size %lu",
0d1ee42f
AR		 2571 sbi->s_desc_size);
2572 goto failed_mount;
2573 }
2574 } else
2575 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 2576
ac27a0ec 2577 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2578 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2579 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 2580 goto cantfind_ext4;
0b8e58a1 2581
617ba13b 2582 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2583 if (sbi->s_inodes_per_block == 0)
617ba13b 2584 goto cantfind_ext4;
ac27a0ec
DK		 2585 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2586 sbi->s_inodes_per_block;
0d1ee42f 2587 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2588 sbi->s_sbh = bh;
2589 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2590 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2591 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 2592
2b2d6d01 2593 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2594 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2595 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2596 i = le32_to_cpu(es->s_flags);
2597 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2598 sbi->s_hash_unsigned = 3;
2599 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2600#ifdef __CHAR_UNSIGNED__
2601 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2602 sbi->s_hash_unsigned = 3;
2603#else
2604 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2605#endif
2606 sb->s_dirt = 1;
2607 }
ac27a0ec
DK		 2608
2609 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 2610 ext4_msg(sb, KERN_ERR,
2611 "#blocks per group too big: %lu",
2b2d6d01 2612 sbi->s_blocks_per_group);
ac27a0ec
DK		 2613 goto failed_mount;
2614 }
ac27a0ec 2615 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 2616 ext4_msg(sb, KERN_ERR,
2617 "#inodes per group too big: %lu",
2b2d6d01 2618 sbi->s_inodes_per_group);
ac27a0ec
DK		 2619 goto failed_mount;
2620 }
2621
bf43d84b
ES		 2622 /*
2623 * Test whether we have more sectors than will fit in sector_t,
2624 * and whether the max offset is addressable by the page cache.
2625 */
2626 if ((ext4_blocks_count(es) >
2627 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2628 (ext4_blocks_count(es) >
2629 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
b31e1552 2630 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 2631 " too large to mount safely on this system");
ac27a0ec 2632 if (sizeof(sector_t) < 8)
90c699a9 2633 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
bf43d84b 2634 ret = -EFBIG;
ac27a0ec
DK		 2635 goto failed_mount;
2636 }
2637
617ba13b
MC		 2638 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2639 goto cantfind_ext4;
e7c95593 2640
0f2ddca6
FTN		 2641 /* check blocks count against device size */
2642 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2643 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 2644 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2645 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 2646 ext4_blocks_count(es), blocks_count);
2647 goto failed_mount;
2648 }
2649
0b8e58a1
AD		 2650 /*
2651 * It makes no sense for the first data block to be beyond the end
2652 * of the filesystem.
2653 */
2654 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 2655 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2656 "block %u is beyond end of filesystem (%llu)",
2657 le32_to_cpu(es->s_first_data_block),
2658 ext4_blocks_count(es));
e7c95593
ES		 2659 goto failed_mount;
2660 }
bd81d8ee
LV		 2661 blocks_count = (ext4_blocks_count(es) -
2662 le32_to_cpu(es->s_first_data_block) +
2663 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2664 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 2665 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 2666 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 2667 "(block count %llu, first data block %u, "
b31e1552 2668 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 2669 ext4_blocks_count(es),
2670 le32_to_cpu(es->s_first_data_block),
2671 EXT4_BLOCKS_PER_GROUP(sb));
2672 goto failed_mount;
2673 }
bd81d8ee 2674 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 2675 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2676 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 2677 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2678 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2679 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2680 GFP_KERNEL);
2681 if (sbi->s_group_desc == NULL) {
b31e1552 2682 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 2683 goto failed_mount;
2684 }
2685
3244fcb1 2686#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2687 if (ext4_proc_root)
2688 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2689#endif
240799cd 2690
705895b6 2691 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2692
2693 for (i = 0; i < db_count; i++) {
70bbb3e0 2694 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2695 sbi->s_group_desc[i] = sb_bread(sb, block);
2696 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 2697 ext4_msg(sb, KERN_ERR,
2698 "can't read group descriptor %d", i);
ac27a0ec
DK		 2699 db_count = i;
2700 goto failed_mount2;
2701 }
2702 }
2b2d6d01 2703 if (!ext4_check_descriptors(sb)) {
b31e1552 2704 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 2705 goto failed_mount2;
2706 }
772cb7c8
JS		 2707 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2708 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 2709 ext4_msg(sb, KERN_ERR,
2710 "unable to initialize "
2711 "flex_bg meta info!");
772cb7c8
JS		 2712 goto failed_mount2;
2713 }
2714
ac27a0ec
DK		 2715 sbi->s_gdb_count = db_count;
2716 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2717 spin_lock_init(&sbi->s_next_gen_lock);
2718
833f4077
PZ		 2719 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2720 ext4_count_free_blocks(sb));
2721 if (!err) {
2722 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2723 ext4_count_free_inodes(sb));
2724 }
2725 if (!err) {
2726 err = percpu_counter_init(&sbi->s_dirs_counter,
2727 ext4_count_dirs(sb));
2728 }
6bc6e63f
AK		 2729 if (!err) {
2730 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2731 }
833f4077 2732 if (err) {
b31e1552 2733 ext4_msg(sb, KERN_ERR, "insufficient memory");
833f4077
PZ		 2734 goto failed_mount3;
2735 }
ac27a0ec 2736
c9de560d 2737 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 2738 sbi->s_max_writeback_mb_bump = 128;
c9de560d 2739
ac27a0ec
DK		 2740 /*
2741 * set up enough so that it can read an inode
2742 */
9ca92389
TT		 2743 if (!test_opt(sb, NOLOAD) &&
2744 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2745 sb->s_op = &ext4_sops;
2746 else
2747 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2748 sb->s_export_op = &ext4_export_ops;
2749 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2750#ifdef CONFIG_QUOTA
617ba13b
MC		 2751 sb->s_qcop = &ext4_qctl_operations;
2752 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2753#endif
2754 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2755 mutex_init(&sbi->s_orphan_lock);
32ed5058 2756 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2757
2758 sb->s_root = NULL;
2759
2760 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2761 EXT4_HAS_INCOMPAT_FEATURE(sb,
2762 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2763
2764 /*
2765 * The first inode we look at is the journal inode. Don't try
2766 * root first: it may be modified in the journal!
2767 */
2768 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2769 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2770 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2771 goto failed_mount3;
0390131b
FM		 2772 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2773 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 2774 ext4_msg(sb, KERN_ERR, "required journal recovery "
2775 "suppressed and not mounted read-only");
0390131b 2776 goto failed_mount4;
ac27a0ec 2777 } else {
0390131b
FM		 2778 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2779 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2780 sbi->s_journal = NULL;
2781 needs_recovery = 0;
2782 goto no_journal;
ac27a0ec
DK		 2783 }
2784
eb40a09c
JS		 2785 if (ext4_blocks_count(es) > 0xffffffffULL &&
2786 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2787 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 2788 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
eb40a09c
JS		 2789 goto failed_mount4;
2790 }
2791
d4da6c9c
LT		 2792 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2793 jbd2_journal_set_features(sbi->s_journal,
2794 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 2795 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2796 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2797 jbd2_journal_set_features(sbi->s_journal,
2798 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 2799 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2800 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2801 } else {
2802 jbd2_journal_clear_features(sbi->s_journal,
2803 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2804 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2805 }
818d276c 2806
ac27a0ec
DK		 2807 /* We have now updated the journal if required, so we can
2808 * validate the data journaling mode. */
2809 switch (test_opt(sb, DATA_FLAGS)) {
2810 case 0:
2811 /* No mode set, assume a default based on the journal
63f57933
AM		 2812 * capabilities: ORDERED_DATA if the journal can
2813 * cope, else JOURNAL_DATA
2814 */
dab291af
MC		 2815 if (jbd2_journal_check_available_features
2816 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2817 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2818 else
2819 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2820 break;
2821
617ba13b
MC		 2822 case EXT4_MOUNT_ORDERED_DATA:
2823 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2824 if (!jbd2_journal_check_available_features
2825 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 2826 ext4_msg(sb, KERN_ERR, "Journal does not support "
2827 "requested data journaling mode");
ac27a0ec
DK		 2828 goto failed_mount4;
2829 }
2830 default:
2831 break;
2832 }
b3881f74 2833 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2834
0390131b 2835no_journal:
ac27a0ec
DK		 2836
2837 if (test_opt(sb, NOBH)) {
617ba13b 2838 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
b31e1552
ES		 2839 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2840 "its supported only with writeback mode");
ac27a0ec
DK		 2841 clear_opt(sbi->s_mount_opt, NOBH);
2842 }
2843 }
4c0425ff
MC		 2844 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2845 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2846 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2847 goto failed_mount_wq;
2848 }
2849
ac27a0ec 2850 /*
dab291af 2851 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2852 * so we can safely mount the rest of the filesystem now.
2853 */
2854
1d1fe1ee
DH		 2855 root = ext4_iget(sb, EXT4_ROOT_INO);
2856 if (IS_ERR(root)) {
b31e1552 2857 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 2858 ret = PTR_ERR(root);
ac27a0ec
DK		 2859 goto failed_mount4;
2860 }
2861 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2862 iput(root);
b31e1552 2863 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 2864 goto failed_mount4;
2865 }
1d1fe1ee
DH		 2866 sb->s_root = d_alloc_root(root);
2867 if (!sb->s_root) {
b31e1552 2868 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 2869 iput(root);
2870 ret = -ENOMEM;
2871 goto failed_mount4;
2872 }
ac27a0ec 2873
2b2d6d01 2874 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2875
2876 /* determine the minimum size of new large inodes, if present */
2877 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2878 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2879 EXT4_GOOD_OLD_INODE_SIZE;
2880 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2881 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2882 if (sbi->s_want_extra_isize <
2883 le16_to_cpu(es->s_want_extra_isize))
2884 sbi->s_want_extra_isize =
2885 le16_to_cpu(es->s_want_extra_isize);
2886 if (sbi->s_want_extra_isize <
2887 le16_to_cpu(es->s_min_extra_isize))
2888 sbi->s_want_extra_isize =
2889 le16_to_cpu(es->s_min_extra_isize);
2890 }
2891 }
2892 /* Check if enough inode space is available */
2893 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2894 sbi->s_inode_size) {
2895 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2896 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 2897 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2898 "available");
ef7f3835
KS		 2899 }
2900
90576c0b
TT		 2901 if (test_opt(sb, DELALLOC) &&
2902 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 2903 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2904 "requested data journaling mode");
c2774d84 2905 clear_opt(sbi->s_mount_opt, DELALLOC);
90576c0b 2906 }
c2774d84 2907
6fd058f7
TT		 2908 err = ext4_setup_system_zone(sb);
2909 if (err) {
b31e1552
ES		 2910 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2911 "zone (%d)\n", err);
6fd058f7
TT		 2912 goto failed_mount4;
2913 }
2914
c2774d84
AK		 2915 ext4_ext_init(sb);
2916 err = ext4_mb_init(sb, needs_recovery);
2917 if (err) {
b31e1552
ES		 2918 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2919 err);
c2774d84
AK		 2920 goto failed_mount4;
2921 }
2922
3197ebdb
TT		 2923 sbi->s_kobj.kset = ext4_kset;
2924 init_completion(&sbi->s_kobj_unregister);
2925 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2926 "%s", sb->s_id);
2927 if (err) {
2928 ext4_mb_release(sb);
2929 ext4_ext_release(sb);
2930 goto failed_mount4;
2931 };
2932
617ba13b
MC		 2933 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2934 ext4_orphan_cleanup(sb, es);
2935 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2936 if (needs_recovery) {
b31e1552 2937 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 2938 ext4_mark_recovery_complete(sb, es);
2939 }
2940 if (EXT4_SB(sb)->s_journal) {
2941 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2942 descr = " journalled data mode";
2943 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2944 descr = " ordered data mode";
2945 else
2946 descr = " writeback data mode";
2947 } else
2948 descr = "out journal";
2949
b31e1552 2950 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
ac27a0ec
DK		 2951
2952 lock_kernel();
2953 return 0;
2954
617ba13b 2955cantfind_ext4:
ac27a0ec 2956 if (!silent)
b31e1552 2957 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 2958 goto failed_mount;
2959
2960failed_mount4:
b31e1552 2961 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 2962 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2963failed_mount_wq:
6fd058f7 2964 ext4_release_system_zone(sb);
0390131b
FM		 2965 if (sbi->s_journal) {
2966 jbd2_journal_destroy(sbi->s_journal);
2967 sbi->s_journal = NULL;
2968 }
ac27a0ec 2969failed_mount3:
c5ca7c76
TT		 2970 if (sbi->s_flex_groups) {
2971 if (is_vmalloc_addr(sbi->s_flex_groups))
2972 vfree(sbi->s_flex_groups);
2973 else
2974 kfree(sbi->s_flex_groups);
2975 }
ac27a0ec
DK		 2976 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2977 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2978 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2979 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2980failed_mount2:
2981 for (i = 0; i < db_count; i++)
2982 brelse(sbi->s_group_desc[i]);
2983 kfree(sbi->s_group_desc);
2984failed_mount:
240799cd 2985 if (sbi->s_proc) {
9f6200bb 2986 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2987 }
ac27a0ec
DK		 2988#ifdef CONFIG_QUOTA
2989 for (i = 0; i < MAXQUOTAS; i++)
2990 kfree(sbi->s_qf_names[i]);
2991#endif
617ba13b 2992 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2993 brelse(bh);
2994out_fail:
2995 sb->s_fs_info = NULL;
f6830165 2996 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2997 kfree(sbi);
2998 lock_kernel();
1d1fe1ee 2999 return ret;
ac27a0ec
DK		 3000}
3001
3002/*
3003 * Setup any per-fs journal parameters now. We'll do this both on
3004 * initial mount, once the journal has been initialised but before we've
3005 * done any recovery; and again on any subsequent remount.
3006 */
617ba13b 3007static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3008{
617ba13b 3009 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3010
30773840
TT		 3011 journal->j_commit_interval = sbi->s_commit_interval;
3012 journal->j_min_batch_time = sbi->s_min_batch_time;
3013 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3014
3015 spin_lock(&journal->j_state_lock);
3016 if (test_opt(sb, BARRIER))
dab291af 3017 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3018 else
dab291af 3019 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3020 if (test_opt(sb, DATA_ERR_ABORT))
3021 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3022 else
3023 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 3024 spin_unlock(&journal->j_state_lock);
3025}
3026
617ba13b 3027static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3028 unsigned int journal_inum)
3029{
3030 struct inode *journal_inode;
3031 journal_t *journal;
3032
0390131b
FM		 3033 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3034
ac27a0ec
DK		 3035 /* First, test for the existence of a valid inode on disk. Bad
3036 * things happen if we iget() an unused inode, as the subsequent
3037 * iput() will try to delete it. */
3038
1d1fe1ee
DH		 3039 journal_inode = ext4_iget(sb, journal_inum);
3040 if (IS_ERR(journal_inode)) {
b31e1552 3041 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3042 return NULL;
3043 }
3044 if (!journal_inode->i_nlink) {
3045 make_bad_inode(journal_inode);
3046 iput(journal_inode);
b31e1552 3047 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3048 return NULL;
3049 }
3050
e5f8eab8 3051 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3052 journal_inode, journal_inode->i_size);
1d1fe1ee 3053 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3054 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3055 iput(journal_inode);
3056 return NULL;
3057 }
3058
dab291af 3059 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3060 if (!journal) {
b31e1552 3061 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3062 iput(journal_inode);
3063 return NULL;
3064 }
3065 journal->j_private = sb;
617ba13b 3066 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3067 return journal;
3068}
3069
617ba13b 3070static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3071 dev_t j_dev)
3072{
2b2d6d01 3073 struct buffer_head *bh;
ac27a0ec 3074 journal_t *journal;
617ba13b
MC		 3075 ext4_fsblk_t start;
3076 ext4_fsblk_t len;
ac27a0ec 3077 int hblock, blocksize;
617ba13b 3078 ext4_fsblk_t sb_block;
ac27a0ec 3079 unsigned long offset;
2b2d6d01 3080 struct ext4_super_block *es;
ac27a0ec
DK		 3081 struct block_device *bdev;
3082
0390131b
FM		 3083 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3084
b31e1552 3085 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3086 if (bdev == NULL)
3087 return NULL;
3088
3089 if (bd_claim(bdev, sb)) {
b31e1552
ES		 3090 ext4_msg(sb, KERN_ERR,
3091 "failed to claim external journal device");
9a1c3542 3092 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3093 return NULL;
3094 }
3095
3096 blocksize = sb->s_blocksize;
e1defc4f 3097 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3098 if (blocksize < hblock) {
b31e1552
ES		 3099 ext4_msg(sb, KERN_ERR,
3100 "blocksize too small for journal device");
ac27a0ec
DK		 3101 goto out_bdev;
3102 }
3103
617ba13b
MC		 3104 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3105 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3106 set_blocksize(bdev, blocksize);
3107 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3108 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3109 "external journal");
ac27a0ec
DK		 3110 goto out_bdev;
3111 }
3112
617ba13b
MC		 3113 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3114 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3115 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3116 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3117 ext4_msg(sb, KERN_ERR, "external journal has "
3118 "bad superblock");
ac27a0ec
DK		 3119 brelse(bh);
3120 goto out_bdev;
3121 }
3122
617ba13b 3123 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3124 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3125 brelse(bh);
3126 goto out_bdev;
3127 }
3128
bd81d8ee 3129 len = ext4_blocks_count(es);
ac27a0ec
DK		 3130 start = sb_block + 1;
3131 brelse(bh); /* we're done with the superblock */
3132
dab291af 3133 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3134 start, len, blocksize);
3135 if (!journal) {
b31e1552 3136 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3137 goto out_bdev;
3138 }
3139 journal->j_private = sb;
3140 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3141 wait_on_buffer(journal->j_sb_buffer);
3142 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3143 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3144 goto out_journal;
3145 }
3146 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3147 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3148 "user (unsupported) - %d",
ac27a0ec
DK		 3149 be32_to_cpu(journal->j_superblock->s_nr_users));
3150 goto out_journal;
3151 }
617ba13b
MC		 3152 EXT4_SB(sb)->journal_bdev = bdev;
3153 ext4_init_journal_params(sb, journal);
ac27a0ec 3154 return journal;
0b8e58a1 3155
ac27a0ec 3156out_journal:
dab291af 3157 jbd2_journal_destroy(journal);
ac27a0ec 3158out_bdev:
617ba13b 3159 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3160 return NULL;
3161}
3162
617ba13b
MC		 3163static int ext4_load_journal(struct super_block *sb,
3164 struct ext4_super_block *es,
ac27a0ec
DK		 3165 unsigned long journal_devnum)
3166{
3167 journal_t *journal;
3168 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3169 dev_t journal_dev;
3170 int err = 0;
3171 int really_read_only;
3172
0390131b
FM		 3173 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3174
ac27a0ec
DK		 3175 if (journal_devnum &&
3176 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3177 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3178 "numbers have changed");
ac27a0ec
DK		 3179 journal_dev = new_decode_dev(journal_devnum);
3180 } else
3181 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3182
3183 really_read_only = bdev_read_only(sb->s_bdev);
3184
3185 /*
3186 * Are we loading a blank journal or performing recovery after a
3187 * crash? For recovery, we need to check in advance whether we
3188 * can get read-write access to the device.
3189 */
617ba13b 3190 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3191 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3192 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3193 "required on readonly filesystem");
ac27a0ec 3194 if (really_read_only) {
b31e1552
ES		 3195 ext4_msg(sb, KERN_ERR, "write access "
3196 "unavailable, cannot proceed");
ac27a0ec
DK		 3197 return -EROFS;
3198 }
b31e1552
ES		 3199 ext4_msg(sb, KERN_INFO, "write access will "
3200 "be enabled during recovery");
ac27a0ec
DK		 3201 }
3202 }
3203
3204 if (journal_inum && journal_dev) {
b31e1552
ES		 3205 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3206 "and inode journals!");
ac27a0ec
DK		 3207 return -EINVAL;
3208 }
3209
3210 if (journal_inum) {
617ba13b 3211 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3212 return -EINVAL;
3213 } else {
617ba13b 3214 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3215 return -EINVAL;
3216 }
3217
90576c0b 3218 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3219 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3220
ac27a0ec 3221 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3222 err = jbd2_journal_update_format(journal);
ac27a0ec 3223 if (err) {
b31e1552 3224 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3225 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3226 return err;
3227 }
3228 }
3229
617ba13b 3230 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3231 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3232 if (!err)
dab291af 3233 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3234
3235 if (err) {
b31e1552 3236 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3237 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3238 return err;
3239 }
3240
617ba13b
MC		 3241 EXT4_SB(sb)->s_journal = journal;
3242 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3243
3244 if (journal_devnum &&
3245 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3246 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3247
3248 /* Make sure we flush the recovery flag to disk. */
e2d67052 3249 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3250 }
3251
3252 return 0;
3253}
3254
e2d67052 3255static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3256{
e2d67052 3257 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3258 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3259 int error = 0;
ac27a0ec
DK		 3260
3261 if (!sbh)
c4be0c1d 3262 return error;
914258bf
TT		 3263 if (buffer_write_io_error(sbh)) {
3264 /*
3265 * Oh, dear. A previous attempt to write the
3266 * superblock failed. This could happen because the
3267 * USB device was yanked out. Or it could happen to
3268 * be a transient write error and maybe the block will
3269 * be remapped. Nothing we can do but to retry the
3270 * write and hope for the best.
3271 */
b31e1552
ES		 3272 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3273 "superblock detected");
914258bf
TT		 3274 clear_buffer_write_io_error(sbh);
3275 set_buffer_uptodate(sbh);
3276 }
71290b36
TT		 3277 /*
3278 * If the file system is mounted read-only, don't update the
3279 * superblock write time. This avoids updating the superblock
3280 * write time when we are mounting the root file system
3281 * read/only but we need to replay the journal; at that point,
3282 * for people who are east of GMT and who make their clock
3283 * tick in localtime for Windows bug-for-bug compatibility,
3284 * the clock is set in the future, and this will cause e2fsck
3285 * to complain and force a full file system check.
3286 */
3287 if (!(sb->s_flags & MS_RDONLY))
3288 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3289 es->s_kbytes_written =
3290 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3291 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3292 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3293 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3294 &EXT4_SB(sb)->s_freeblocks_counter));
3295 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3296 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3297 sb->s_dirt = 0;
ac27a0ec
DK		 3298 BUFFER_TRACE(sbh, "marking dirty");
3299 mark_buffer_dirty(sbh);
914258bf 3300 if (sync) {
c4be0c1d
TS		 3301 error = sync_dirty_buffer(sbh);
3302 if (error)
3303 return error;
3304
3305 error = buffer_write_io_error(sbh);
3306 if (error) {
b31e1552
ES		 3307 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3308 "superblock");
914258bf
TT		 3309 clear_buffer_write_io_error(sbh);
3310 set_buffer_uptodate(sbh);
3311 }
3312 }
c4be0c1d 3313 return error;
ac27a0ec
DK		 3314}
3315
ac27a0ec
DK		 3316/*
3317 * Have we just finished recovery? If so, and if we are mounting (or
3318 * remounting) the filesystem readonly, then we will end up with a
3319 * consistent fs on disk. Record that fact.
3320 */
2b2d6d01
TT		 3321static void ext4_mark_recovery_complete(struct super_block *sb,
3322 struct ext4_super_block *es)
ac27a0ec 3323{
617ba13b 3324 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3325
0390131b
FM		 3326 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3327 BUG_ON(journal != NULL);
3328 return;
3329 }
dab291af 3330 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3331 if (jbd2_journal_flush(journal) < 0)
3332 goto out;
3333
617ba13b 3334 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3335 sb->s_flags & MS_RDONLY) {
617ba13b 3336 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3337 ext4_commit_super(sb, 1);
ac27a0ec 3338 }
7ffe1ea8
HK		 3339
3340out:
dab291af 3341 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3342}
3343
3344/*
3345 * If we are mounting (or read-write remounting) a filesystem whose journal
3346 * has recorded an error from a previous lifetime, move that error to the
3347 * main filesystem now.
3348 */
2b2d6d01
TT		 3349static void ext4_clear_journal_err(struct super_block *sb,
3350 struct ext4_super_block *es)
ac27a0ec
DK		 3351{
3352 journal_t *journal;
3353 int j_errno;
3354 const char *errstr;
3355
0390131b
FM		 3356 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3357
617ba13b 3358 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3359
3360 /*
3361 * Now check for any error status which may have been recorded in the
617ba13b 3362 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3363 */
3364
dab291af 3365 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3366 if (j_errno) {
3367 char nbuf[16];
3368
617ba13b 3369 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3370 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3371 "from previous mount: %s", errstr);
46e665e9 3372 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3373 "filesystem check.");
3374
617ba13b
MC		 3375 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3376 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3377 ext4_commit_super(sb, 1);
ac27a0ec 3378
dab291af 3379 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3380 }
3381}
3382
3383/*
3384 * Force the running and committing transactions to commit,
3385 * and wait on the commit.
3386 */
617ba13b 3387int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3388{
3389 journal_t *journal;
0390131b 3390 int ret = 0;
ac27a0ec
DK		 3391
3392 if (sb->s_flags & MS_RDONLY)
3393 return 0;
3394
617ba13b 3395 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3396 if (journal)
0390131b 3397 ret = ext4_journal_force_commit(journal);
0390131b 3398
ac27a0ec
DK		 3399 return ret;
3400}
3401
2b2d6d01 3402static void ext4_write_super(struct super_block *sb)
ac27a0ec 3403{
ebc1ac16 3404 lock_super(sb);
9ca92389 3405 ext4_commit_super(sb, 1);
ebc1ac16 3406 unlock_super(sb);
ac27a0ec
DK		 3407}
3408
617ba13b 3409static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3410{
14ce0cb4 3411 int ret = 0;
9eddacf9 3412 tid_t target;
8d5d02e6 3413 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3414
9bffad1e 3415 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 3416 flush_workqueue(sbi->dio_unwritten_wq);
3417 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 3418 if (wait)
8d5d02e6 3419 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 3420 }
14ce0cb4 3421 return ret;
ac27a0ec
DK		 3422}
3423
3424/*
3425 * LVM calls this function before a (read-only) snapshot is created. This
3426 * gives us a chance to flush the journal completely and mark the fs clean.
3427 */
c4be0c1d 3428static int ext4_freeze(struct super_block *sb)
ac27a0ec 3429{
c4be0c1d
TS		 3430 int error = 0;
3431 journal_t *journal;
ac27a0ec 3432
9ca92389
TT		 3433 if (sb->s_flags & MS_RDONLY)
3434 return 0;
ac27a0ec 3435
9ca92389 3436 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3437
9ca92389
TT		 3438 /* Now we set up the journal barrier. */
3439 jbd2_journal_lock_updates(journal);
ac27a0ec 3440
9ca92389
TT		 3441 /*
3442 * Don't clear the needs_recovery flag if we failed to flush
3443 * the journal.
3444 */
3445 error = jbd2_journal_flush(journal);
3446 if (error < 0) {
3447 out:
3448 jbd2_journal_unlock_updates(journal);
3449 return error;
ac27a0ec 3450 }
9ca92389
TT		 3451
3452 /* Journal blocked and flushed, clear needs_recovery flag. */
3453 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3454 error = ext4_commit_super(sb, 1);
3455 if (error)
3456 goto out;
c4be0c1d 3457 return 0;
ac27a0ec
DK		 3458}
3459
3460/*
3461 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3462 * flag here, even though the filesystem is not technically dirty yet.
3463 */
c4be0c1d 3464static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3465{
9ca92389
TT		 3466 if (sb->s_flags & MS_RDONLY)
3467 return 0;
3468
3469 lock_super(sb);
3470 /* Reset the needs_recovery flag before the fs is unlocked. */
3471 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3472 ext4_commit_super(sb, 1);
3473 unlock_super(sb);
3474 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3475 return 0;
ac27a0ec
DK		 3476}
3477
2b2d6d01 3478static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3479{
2b2d6d01 3480 struct ext4_super_block *es;
617ba13b
MC		 3481 struct ext4_sb_info *sbi = EXT4_SB(sb);
3482 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3483 unsigned long old_sb_flags;
617ba13b 3484 struct ext4_mount_options old_opts;
8a266467 3485 ext4_group_t g;
b3881f74 3486 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3487 int err;
3488#ifdef CONFIG_QUOTA
3489 int i;
3490#endif
3491
337eb00a
AIB		 3492 lock_kernel();
3493
ac27a0ec 3494 /* Store the original options */
bbd6851a 3495 lock_super(sb);
ac27a0ec
DK		 3496 old_sb_flags = sb->s_flags;
3497 old_opts.s_mount_opt = sbi->s_mount_opt;
3498 old_opts.s_resuid = sbi->s_resuid;
3499 old_opts.s_resgid = sbi->s_resgid;
3500 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3501 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3502 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3503#ifdef CONFIG_QUOTA
3504 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3505 for (i = 0; i < MAXQUOTAS; i++)
3506 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3507#endif
b3881f74
TT		 3508 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3509 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3510
3511 /*
3512 * Allow the "check" option to be passed as a remount option.
3513 */
b3881f74
TT		 3514 if (!parse_options(data, sb, NULL, &journal_ioprio,
3515 &n_blocks_count, 1)) {
ac27a0ec
DK		 3516 err = -EINVAL;
3517 goto restore_opts;
3518 }
3519
4ab2f15b 3520 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
46e665e9 3521 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3522
3523 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3524 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3525
3526 es = sbi->s_es;
3527
b3881f74 3528 if (sbi->s_journal) {
0390131b 3529 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3530 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3531 }
ac27a0ec
DK		 3532
3533 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3534 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 3535 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 3536 err = -EROFS;
3537 goto restore_opts;
3538 }
3539
3540 if (*flags & MS_RDONLY) {
3541 /*
3542 * First of all, the unconditional stuff we have to do
3543 * to disable replay of the journal when we next remount
3544 */
3545 sb->s_flags |= MS_RDONLY;
3546
3547 /*
3548 * OK, test if we are remounting a valid rw partition
3549 * readonly, and if so set the rdonly flag and then
3550 * mark the partition as valid again.
3551 */
617ba13b
MC		 3552 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3553 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3554 es->s_state = cpu_to_le16(sbi->s_mount_state);
3555
a63c9eb2 3556 if (sbi->s_journal)
0390131b 3557 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3558 } else {
a13fb1a4
ES		 3559 /* Make sure we can mount this feature set readwrite */
3560 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 3561 err = -EROFS;
3562 goto restore_opts;
3563 }
8a266467
TT		 3564 /*
3565 * Make sure the group descriptor checksums
0b8e58a1 3566 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 3567 */
3568 for (g = 0; g < sbi->s_groups_count; g++) {
3569 struct ext4_group_desc *gdp =
3570 ext4_get_group_desc(sb, g, NULL);
3571
3572 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 3573 ext4_msg(sb, KERN_ERR,
3574 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 3575 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3576 le16_to_cpu(gdp->bg_checksum));
3577 err = -EINVAL;
3578 goto restore_opts;
3579 }
3580 }
3581
ead6596b
ES		 3582 /*
3583 * If we have an unprocessed orphan list hanging
3584 * around from a previously readonly bdev mount,
3585 * require a full umount/remount for now.
3586 */
3587 if (es->s_last_orphan) {
b31e1552 3588 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 3589 "remount RDWR because of unprocessed "
3590 "orphan inode list. Please "
b31e1552 3591 "umount/remount instead");
ead6596b
ES		 3592 err = -EINVAL;
3593 goto restore_opts;
3594 }
3595
ac27a0ec
DK		 3596 /*
3597 * Mounting a RDONLY partition read-write, so reread
3598 * and store the current valid flag. (It may have
3599 * been changed by e2fsck since we originally mounted
3600 * the partition.)
3601 */
0390131b
FM		 3602 if (sbi->s_journal)
3603 ext4_clear_journal_err(sb, es);
ac27a0ec 3604 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3605 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3606 goto restore_opts;
2b2d6d01 3607 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3608 sb->s_flags &= ~MS_RDONLY;
3609 }
3610 }
6fd058f7 3611 ext4_setup_system_zone(sb);
0390131b 3612 if (sbi->s_journal == NULL)
e2d67052 3613 ext4_commit_super(sb, 1);
0390131b 3614
ac27a0ec
DK		 3615#ifdef CONFIG_QUOTA
3616 /* Release old quota file names */
3617 for (i = 0; i < MAXQUOTAS; i++)
3618 if (old_opts.s_qf_names[i] &&
3619 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3620 kfree(old_opts.s_qf_names[i]);
3621#endif
bbd6851a 3622 unlock_super(sb);
337eb00a 3623 unlock_kernel();
ac27a0ec 3624 return 0;
0b8e58a1 3625
ac27a0ec
DK		 3626restore_opts:
3627 sb->s_flags = old_sb_flags;
3628 sbi->s_mount_opt = old_opts.s_mount_opt;
3629 sbi->s_resuid = old_opts.s_resuid;
3630 sbi->s_resgid = old_opts.s_resgid;
3631 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3632 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3633 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3634#ifdef CONFIG_QUOTA
3635 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3636 for (i = 0; i < MAXQUOTAS; i++) {
3637 if (sbi->s_qf_names[i] &&
3638 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3639 kfree(sbi->s_qf_names[i]);
3640 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3641 }
3642#endif
bbd6851a 3643 unlock_super(sb);
337eb00a 3644 unlock_kernel();
ac27a0ec
DK		 3645 return err;
3646}
3647
2b2d6d01 3648static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3649{
3650 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3651 struct ext4_sb_info *sbi = EXT4_SB(sb);
3652 struct ext4_super_block *es = sbi->s_es;
960cc398 3653 u64 fsid;
ac27a0ec 3654
5e70030d
BP		 3655 if (test_opt(sb, MINIX_DF)) {
3656 sbi->s_overhead_last = 0;
6bc9feff 3657 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3658 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3659 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3660
3661 /*
5e70030d
BP		 3662 * Compute the overhead (FS structures). This is constant
3663 * for a given filesystem unless the number of block groups
3664 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3665 */
3666
3667 /*
3668 * All of the blocks before first_data_block are
3669 * overhead
3670 */
3671 overhead = le32_to_cpu(es->s_first_data_block);
3672
3673 /*
3674 * Add the overhead attributed to the superblock and
3675 * block group descriptors. If the sparse superblocks
3676 * feature is turned on, then not all groups have this.
3677 */
3678 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3679 overhead += ext4_bg_has_super(sb, i) +
3680 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3681 cond_resched();
3682 }
3683
3684 /*
3685 * Every block group has an inode bitmap, a block
3686 * bitmap, and an inode table.
3687 */
5e70030d
BP		 3688 overhead += ngroups * (2 + sbi->s_itb_per_group);
3689 sbi->s_overhead_last = overhead;
3690 smp_wmb();
6bc9feff 3691 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3692 }
3693
617ba13b 3694 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3695 buf->f_bsize = sb->s_blocksize;
5e70030d 3696 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3697 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3698 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
bd81d8ee
LV		 3699 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3700 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3701 buf->f_bavail = 0;
3702 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3703 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 3704 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3705 fsid = le64_to_cpup((void *)es->s_uuid) ^
3706 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3707 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3708 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 3709
ac27a0ec
DK		 3710 return 0;
3711}
3712
0b8e58a1
AD		 3713/* Helper function for writing quotas on sync - we need to start transaction
3714 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 3715 * Process 1 Process 2
617ba13b 3716 * ext4_create() quota_sync()
a269eb18
JK		 3717 * jbd2_journal_start() write_dquot()
3718 * vfs_dq_init() down(dqio_mutex)
dab291af 3719 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3720 *
3721 */
3722
3723#ifdef CONFIG_QUOTA
3724
3725static inline struct inode *dquot_to_inode(struct dquot *dquot)
3726{
3727 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3728}
3729
617ba13b 3730static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3731{
3732 int ret, err;
3733 handle_t *handle;
3734 struct inode *inode;
3735
3736 inode = dquot_to_inode(dquot);
617ba13b 3737 handle = ext4_journal_start(inode,
0b8e58a1 3738 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3739 if (IS_ERR(handle))
3740 return PTR_ERR(handle);
3741 ret = dquot_commit(dquot);
617ba13b 3742 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3743 if (!ret)
3744 ret = err;
3745 return ret;
3746}
3747
617ba13b 3748static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3749{
3750 int ret, err;
3751 handle_t *handle;
3752
617ba13b 3753 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3754 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3755 if (IS_ERR(handle))
3756 return PTR_ERR(handle);
3757 ret = dquot_acquire(dquot);
617ba13b 3758 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3759 if (!ret)
3760 ret = err;
3761 return ret;
3762}
3763
617ba13b 3764static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3765{
3766 int ret, err;
3767 handle_t *handle;
3768
617ba13b 3769 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3770 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3771 if (IS_ERR(handle)) {
3772 /* Release dquot anyway to avoid endless cycle in dqput() */
3773 dquot_release(dquot);
ac27a0ec 3774 return PTR_ERR(handle);
9c3013e9 3775 }
ac27a0ec 3776 ret = dquot_release(dquot);
617ba13b 3777 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3778 if (!ret)
3779 ret = err;
3780 return ret;
3781}
3782
617ba13b 3783static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3784{
2c8be6b2 3785 /* Are we journaling quotas? */
617ba13b
MC		 3786 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3787 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3788 dquot_mark_dquot_dirty(dquot);
617ba13b 3789 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3790 } else {
3791 return dquot_mark_dquot_dirty(dquot);
3792 }
3793}
3794
617ba13b 3795static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3796{
3797 int ret, err;
3798 handle_t *handle;
3799
3800 /* Data block + inode block */
617ba13b 3801 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3802 if (IS_ERR(handle))
3803 return PTR_ERR(handle);
3804 ret = dquot_commit_info(sb, type);
617ba13b 3805 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3806 if (!ret)
3807 ret = err;
3808 return ret;
3809}
3810
3811/*
3812 * Turn on quotas during mount time - we need to find
3813 * the quota file and such...
3814 */
617ba13b 3815static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3816{
617ba13b 3817 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
0b8e58a1 3818 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3819}
3820
3821/*
3822 * Standard function to be called on quota_on
3823 */
617ba13b 3824static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3825 char *name, int remount)
ac27a0ec
DK		 3826{
3827 int err;
8264613d 3828 struct path path;
ac27a0ec
DK		 3829
3830 if (!test_opt(sb, QUOTA))
3831 return -EINVAL;
8264613d 3832 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3833 if (remount)
8264613d 3834 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3835
8264613d 3836 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3837 if (err)
3838 return err;
0623543b 3839
ac27a0ec 3840 /* Quotafile not on the same filesystem? */
8264613d
AV		 3841 if (path.mnt->mnt_sb != sb) {
3842 path_put(&path);
ac27a0ec
DK		 3843 return -EXDEV;
3844 }
0623543b
JK		 3845 /* Journaling quota? */
3846 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3847 /* Quotafile not in fs root? */
8264613d 3848 if (path.dentry->d_parent != sb->s_root)
b31e1552
ES		 3849 ext4_msg(sb, KERN_WARNING,
3850 "Quota file not on filesystem root. "
3851 "Journaled quota will not work");
2b2d6d01 3852 }
0623543b
JK		 3853
3854 /*
3855 * When we journal data on quota file, we have to flush journal to see
3856 * all updates to the file when we bypass pagecache...
3857 */
0390131b
FM		 3858 if (EXT4_SB(sb)->s_journal &&
3859 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3860 /*
3861 * We don't need to lock updates but journal_flush() could
3862 * otherwise be livelocked...
3863 */
3864 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3865 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3866 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3867 if (err) {
8264613d 3868 path_put(&path);
7ffe1ea8
HK		 3869 return err;
3870 }
0623543b
JK		 3871 }
3872
8264613d
AV		 3873 err = vfs_quota_on_path(sb, type, format_id, &path);
3874 path_put(&path);
77e69dac 3875 return err;
ac27a0ec
DK		 3876}
3877
3878/* Read data from quotafile - avoid pagecache and such because we cannot afford
3879 * acquiring the locks... As quota files are never truncated and quota code
3880 * itself serializes the operations (and noone else should touch the files)
3881 * we don't have to be afraid of races */
617ba13b 3882static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3883 size_t len, loff_t off)
3884{
3885 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3886 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3887 int err = 0;
3888 int offset = off & (sb->s_blocksize - 1);
3889 int tocopy;
3890 size_t toread;
3891 struct buffer_head *bh;
3892 loff_t i_size = i_size_read(inode);
3893
3894 if (off > i_size)
3895 return 0;
3896 if (off+len > i_size)
3897 len = i_size-off;
3898 toread = len;
3899 while (toread > 0) {
3900 tocopy = sb->s_blocksize - offset < toread ?
3901 sb->s_blocksize - offset : toread;
617ba13b 3902 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3903 if (err)
3904 return err;
3905 if (!bh) /* A hole? */
3906 memset(data, 0, tocopy);
3907 else
3908 memcpy(data, bh->b_data+offset, tocopy);
3909 brelse(bh);
3910 offset = 0;
3911 toread -= tocopy;
3912 data += tocopy;
3913 blk++;
3914 }
3915 return len;
3916}
3917
3918/* Write to quotafile (we know the transaction is already started and has
3919 * enough credits) */
617ba13b 3920static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3921 const char *data, size_t len, loff_t off)
3922{
3923 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3924 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3925 int err = 0;
3926 int offset = off & (sb->s_blocksize - 1);
3927 int tocopy;
617ba13b 3928 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3929 size_t towrite = len;
3930 struct buffer_head *bh;
3931 handle_t *handle = journal_current_handle();
3932
0390131b 3933 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 3934 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3935 " cancelled because transaction is not started",
9c3013e9
JK		 3936 (unsigned long long)off, (unsigned long long)len);
3937 return -EIO;
3938 }
ac27a0ec
DK		 3939 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3940 while (towrite > 0) {
3941 tocopy = sb->s_blocksize - offset < towrite ?
3942 sb->s_blocksize - offset : towrite;
617ba13b 3943 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3944 if (!bh)
3945 goto out;
3946 if (journal_quota) {
617ba13b 3947 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3948 if (err) {
3949 brelse(bh);
3950 goto out;
3951 }
3952 }
3953 lock_buffer(bh);
3954 memcpy(bh->b_data+offset, data, tocopy);
3955 flush_dcache_page(bh->b_page);
3956 unlock_buffer(bh);
3957 if (journal_quota)
0390131b 3958 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3959 else {
3960 /* Always do at least ordered writes for quotas */
678aaf48 3961 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3962 mark_buffer_dirty(bh);
3963 }
3964 brelse(bh);
3965 if (err)
3966 goto out;
3967 offset = 0;
3968 towrite -= tocopy;
3969 data += tocopy;
3970 blk++;
3971 }
3972out:
4d04e4fb
JK		 3973 if (len == towrite) {
3974 mutex_unlock(&inode->i_mutex);
ac27a0ec 3975 return err;
4d04e4fb 3976 }
ac27a0ec
DK		 3977 if (inode->i_size < off+len-towrite) {
3978 i_size_write(inode, off+len-towrite);
617ba13b 3979 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3980 }
ac27a0ec 3981 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3982 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3983 mutex_unlock(&inode->i_mutex);
3984 return len - towrite;
3985}
3986
3987#endif
3988
0b8e58a1
AD		 3989static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3990 const char *dev_name, void *data, struct vfsmount *mnt)
ac27a0ec 3991{
0b8e58a1 3992 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
ac27a0ec
DK		 3993}
3994
a214238d 3995#if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 3996static struct file_system_type ext2_fs_type = {
3997 .owner = THIS_MODULE,
3998 .name = "ext2",
3999 .get_sb = ext4_get_sb,
4000 .kill_sb = kill_block_super,
4001 .fs_flags = FS_REQUIRES_DEV,
4002};
4003
4004static inline void register_as_ext2(void)
4005{
4006 int err = register_filesystem(&ext2_fs_type);
4007 if (err)
4008 printk(KERN_WARNING
4009 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4010}
4011
4012static inline void unregister_as_ext2(void)
4013{
4014 unregister_filesystem(&ext2_fs_type);
4015}
51b7e3c9 4016MODULE_ALIAS("ext2");
24b58424
TT		 4017#else
4018static inline void register_as_ext2(void) { }
4019static inline void unregister_as_ext2(void) { }
4020#endif
4021
a214238d 4022#if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4023static struct file_system_type ext3_fs_type = {
4024 .owner = THIS_MODULE,
4025 .name = "ext3",
4026 .get_sb = ext4_get_sb,
4027 .kill_sb = kill_block_super,
4028 .fs_flags = FS_REQUIRES_DEV,
4029};
4030
4031static inline void register_as_ext3(void)
4032{
4033 int err = register_filesystem(&ext3_fs_type);
4034 if (err)
4035 printk(KERN_WARNING
4036 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4037}
4038
4039static inline void unregister_as_ext3(void)
4040{
4041 unregister_filesystem(&ext3_fs_type);
4042}
51b7e3c9 4043MODULE_ALIAS("ext3");
24b58424
TT		 4044#else
4045static inline void register_as_ext3(void) { }
4046static inline void unregister_as_ext3(void) { }
4047#endif
4048
03010a33
TT		 4049static struct file_system_type ext4_fs_type = {
4050 .owner = THIS_MODULE,
4051 .name = "ext4",
4052 .get_sb = ext4_get_sb,
4053 .kill_sb = kill_block_super,
4054 .fs_flags = FS_REQUIRES_DEV,
4055};
4056
617ba13b 4057static int __init init_ext4_fs(void)
ac27a0ec 4058{
c9de560d
AT		 4059 int err;
4060
6fd058f7
TT		 4061 err = init_ext4_system_zone();
4062 if (err)
4063 return err;
3197ebdb
TT		 4064 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4065 if (!ext4_kset)
6fd058f7 4066 goto out4;
9f6200bb 4067 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 4068 err = init_ext4_mballoc();
ac27a0ec 4069 if (err)
6fd058f7 4070 goto out3;
c9de560d
AT		 4071
4072 err = init_ext4_xattr();
4073 if (err)
4074 goto out2;
ac27a0ec
DK		 4075 err = init_inodecache();
4076 if (err)
4077 goto out1;
24b58424
TT		 4078 register_as_ext2();
4079 register_as_ext3();
03010a33 4080 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4081 if (err)
4082 goto out;
4083 return 0;
4084out:
24b58424
TT		 4085 unregister_as_ext2();
4086 unregister_as_ext3();
ac27a0ec
DK		 4087 destroy_inodecache();
4088out1:
617ba13b 4089 exit_ext4_xattr();
c9de560d
AT		 4090out2:
4091 exit_ext4_mballoc();
6fd058f7
TT		 4092out3:
4093 remove_proc_entry("fs/ext4", NULL);
4094 kset_unregister(ext4_kset);
4095out4:
4096 exit_ext4_system_zone();
ac27a0ec
DK		 4097 return err;
4098}
4099
617ba13b 4100static void __exit exit_ext4_fs(void)
ac27a0ec 4101{
24b58424
TT		 4102 unregister_as_ext2();
4103 unregister_as_ext3();
03010a33 4104 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4105 destroy_inodecache();
617ba13b 4106 exit_ext4_xattr();
c9de560d 4107 exit_ext4_mballoc();
9f6200bb 4108 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4109 kset_unregister(ext4_kset);
6fd058f7 4110 exit_ext4_system_zone();
ac27a0ec
DK		 4111}
4112
4113MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4114MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4115MODULE_LICENSE("GPL");
617ba13b
MC		 4116module_init(init_ext4_fs)
4117module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)