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ext4: Fix accounting of reserved metadata blocks
[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;
705 ei->i_delalloc_reserved_flag = 0;
706 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 707#ifdef CONFIG_QUOTA
708 ei->i_reserved_quota = 0;
709#endif
8d5d02e6
MC		 710 INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
711 ei->cur_aio_dio = NULL;
b436b9be
JK		 712 ei->i_sync_tid = 0;
713 ei->i_datasync_tid = 0;
0b8e58a1 714
ac27a0ec
DK		 715 return &ei->vfs_inode;
716}
717
617ba13b 718static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 719{
9f7dd93d 720 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 721 ext4_msg(inode->i_sb, KERN_ERR,
722 "Inode %lu (%p): orphan list check failed!",
723 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 724 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
725 EXT4_I(inode), sizeof(struct ext4_inode_info),
726 true);
727 dump_stack();
728 }
617ba13b 729 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 730}
731
51cc5068 732static void init_once(void *foo)
ac27a0ec 733{
617ba13b 734 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 735
a35afb83 736 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 737#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 738 init_rwsem(&ei->xattr_sem);
ac27a0ec 739#endif
0e855ac8 740 init_rwsem(&ei->i_data_sem);
a35afb83 741 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 742}
743
744static int init_inodecache(void)
745{
617ba13b
MC		 746 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
747 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 748 0, (SLAB_RECLAIM_ACCOUNT|
749 SLAB_MEM_SPREAD),
20c2df83 750 init_once);
617ba13b 751 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 752 return -ENOMEM;
753 return 0;
754}
755
756static void destroy_inodecache(void)
757{
617ba13b 758 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 759}
760
617ba13b 761static void ext4_clear_inode(struct inode *inode)
ac27a0ec 762{
c2ea3fde 763 ext4_discard_preallocations(inode);
0390131b
FM		 764 if (EXT4_JOURNAL(inode))
765 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 766 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 767}
768
2b2d6d01
TT		 769static inline void ext4_show_quota_options(struct seq_file *seq,
770 struct super_block *sb)
ac27a0ec
DK		 771{
772#if defined(CONFIG_QUOTA)
617ba13b 773 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 774
5a20bdfc
JK		 775 if (sbi->s_jquota_fmt) {
776 char *fmtname = "";
777
778 switch (sbi->s_jquota_fmt) {
779 case QFMT_VFS_OLD:
780 fmtname = "vfsold";
781 break;
782 case QFMT_VFS_V0:
783 fmtname = "vfsv0";
784 break;
785 case QFMT_VFS_V1:
786 fmtname = "vfsv1";
787 break;
788 }
789 seq_printf(seq, ",jqfmt=%s", fmtname);
790 }
ac27a0ec
DK		 791
792 if (sbi->s_qf_names[USRQUOTA])
793 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
794
795 if (sbi->s_qf_names[GRPQUOTA])
796 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
797
617ba13b 798 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 799 seq_puts(seq, ",usrquota");
800
617ba13b 801 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 802 seq_puts(seq, ",grpquota");
803#endif
804}
805
d9c9bef1
MS		 806/*
807 * Show an option if
808 * - it's set to a non-default value OR
809 * - if the per-sb default is different from the global default
810 */
617ba13b 811static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 812{
aa22df2c
AK		 813 int def_errors;
814 unsigned long def_mount_opts;
ac27a0ec 815 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 816 struct ext4_sb_info *sbi = EXT4_SB(sb);
817 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 818
819 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 820 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 821
822 if (sbi->s_sb_block != 1)
823 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
824 if (test_opt(sb, MINIX_DF))
825 seq_puts(seq, ",minixdf");
aa22df2c 826 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 827 seq_puts(seq, ",grpid");
828 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
829 seq_puts(seq, ",nogrpid");
830 if (sbi->s_resuid != EXT4_DEF_RESUID ||
831 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
832 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
833 }
834 if (sbi->s_resgid != EXT4_DEF_RESGID ||
835 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
836 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
837 }
bb4f397a 838 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 839 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 840 def_errors == EXT4_ERRORS_CONTINUE) {
841 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 842 }
843 }
aa22df2c 844 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 845 seq_puts(seq, ",errors=continue");
aa22df2c 846 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 847 seq_puts(seq, ",errors=panic");
aa22df2c 848 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 849 seq_puts(seq, ",nouid32");
aa22df2c 850 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 851 seq_puts(seq, ",debug");
852 if (test_opt(sb, OLDALLOC))
853 seq_puts(seq, ",oldalloc");
03010a33 854#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 855 if (test_opt(sb, XATTR_USER) &&
856 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 857 seq_puts(seq, ",user_xattr");
858 if (!test_opt(sb, XATTR_USER) &&
859 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
860 seq_puts(seq, ",nouser_xattr");
861 }
862#endif
03010a33 863#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 864 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 865 seq_puts(seq, ",acl");
866 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
867 seq_puts(seq, ",noacl");
868#endif
30773840 869 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 870 seq_printf(seq, ",commit=%u",
871 (unsigned) (sbi->s_commit_interval / HZ));
872 }
30773840
TT		 873 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
874 seq_printf(seq, ",min_batch_time=%u",
875 (unsigned) sbi->s_min_batch_time);
876 }
877 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
878 seq_printf(seq, ",max_batch_time=%u",
879 (unsigned) sbi->s_min_batch_time);
880 }
881
571640ca
ES		 882 /*
883 * We're changing the default of barrier mount option, so
884 * let's always display its mount state so it's clear what its
885 * status is.
886 */
887 seq_puts(seq, ",barrier=");
888 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 889 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
890 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 891 if (test_opt(sb, NOBH))
892 seq_puts(seq, ",nobh");
25ec56b5
JNC		 893 if (test_opt(sb, I_VERSION))
894 seq_puts(seq, ",i_version");
dd919b98
AK		 895 if (!test_opt(sb, DELALLOC))
896 seq_puts(seq, ",nodelalloc");
897
ac27a0ec 898
cb45bbe4
MS		 899 if (sbi->s_stripe)
900 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 901 /*
902 * journal mode get enabled in different ways
903 * So just print the value even if we didn't specify it
904 */
617ba13b 905 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 906 seq_puts(seq, ",data=journal");
617ba13b 907 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 908 seq_puts(seq, ",data=ordered");
617ba13b 909 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 910 seq_puts(seq, ",data=writeback");
911
240799cd
TT		 912 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
913 seq_printf(seq, ",inode_readahead_blks=%u",
914 sbi->s_inode_readahead_blks);
915
5bf5683a
HK		 916 if (test_opt(sb, DATA_ERR_ABORT))
917 seq_puts(seq, ",data_err=abort");
918
afd4672d 919 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 920 seq_puts(seq, ",noauto_da_alloc");
afd4672d 921
5328e635
ES		 922 if (test_opt(sb, DISCARD))
923 seq_puts(seq, ",discard");
924
e3bb52ae
ES		 925 if (test_opt(sb, NOLOAD))
926 seq_puts(seq, ",norecovery");
927
617ba13b 928 ext4_show_quota_options(seq, sb);
0b8e58a1 929
ac27a0ec
DK		 930 return 0;
931}
932
1b961ac0 933static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 934 u64 ino, u32 generation)
ac27a0ec 935{
ac27a0ec 936 struct inode *inode;
ac27a0ec 937
617ba13b 938 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 939 return ERR_PTR(-ESTALE);
617ba13b 940 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 941 return ERR_PTR(-ESTALE);
942
943 /* iget isn't really right if the inode is currently unallocated!!
944 *
617ba13b 945 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 946 * deleted, so we should be safe.
947 *
948 * Currently we don't know the generation for parent directory, so
949 * a generation of 0 means "accept any"
950 */
1d1fe1ee
DH		 951 inode = ext4_iget(sb, ino);
952 if (IS_ERR(inode))
953 return ERR_CAST(inode);
954 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 955 iput(inode);
956 return ERR_PTR(-ESTALE);
957 }
1b961ac0
CH		 958
959 return inode;
960}
961
962static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 963 int fh_len, int fh_type)
1b961ac0
CH		 964{
965 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
966 ext4_nfs_get_inode);
967}
968
969static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 970 int fh_len, int fh_type)
1b961ac0
CH		 971{
972 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
973 ext4_nfs_get_inode);
ac27a0ec
DK		 974}
975
c39a7f84
TO		 976/*
977 * Try to release metadata pages (indirect blocks, directories) which are
978 * mapped via the block device. Since these pages could have journal heads
979 * which would prevent try_to_free_buffers() from freeing them, we must use
980 * jbd2 layer's try_to_free_buffers() function to release them.
981 */
0b8e58a1
AD		 982static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
983 gfp_t wait)
c39a7f84
TO		 984{
985 journal_t *journal = EXT4_SB(sb)->s_journal;
986
987 WARN_ON(PageChecked(page));
988 if (!page_has_buffers(page))
989 return 0;
990 if (journal)
991 return jbd2_journal_try_to_free_buffers(journal, page,
992 wait & ~__GFP_WAIT);
993 return try_to_free_buffers(page);
994}
995
ac27a0ec 996#ifdef CONFIG_QUOTA
af5bc92d 997#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 998#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 999
617ba13b
MC		 1000static int ext4_write_dquot(struct dquot *dquot);
1001static int ext4_acquire_dquot(struct dquot *dquot);
1002static int ext4_release_dquot(struct dquot *dquot);
1003static int ext4_mark_dquot_dirty(struct dquot *dquot);
1004static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 1005static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1006 char *path, int remount);
617ba13b
MC		 1007static int ext4_quota_on_mount(struct super_block *sb, int type);
1008static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1009 size_t len, loff_t off);
617ba13b 1010static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1011 const char *data, size_t len, loff_t off);
1012
61e225dc 1013static const struct dquot_operations ext4_quota_operations = {
edf72453
JK		 1014 .initialize = dquot_initialize,
1015 .drop = dquot_drop,
ac27a0ec 1016 .alloc_space = dquot_alloc_space,
60e58e0f
MC		 1017 .reserve_space = dquot_reserve_space,
1018 .claim_space = dquot_claim_space,
1019 .release_rsv = dquot_release_reserved_space,
a9e7f447 1020#ifdef CONFIG_QUOTA
60e58e0f 1021 .get_reserved_space = ext4_get_reserved_space,
a9e7f447 1022#endif
ac27a0ec
DK		 1023 .alloc_inode = dquot_alloc_inode,
1024 .free_space = dquot_free_space,
1025 .free_inode = dquot_free_inode,
1026 .transfer = dquot_transfer,
617ba13b
MC		 1027 .write_dquot = ext4_write_dquot,
1028 .acquire_dquot = ext4_acquire_dquot,
1029 .release_dquot = ext4_release_dquot,
1030 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1031 .write_info = ext4_write_info,
1032 .alloc_dquot = dquot_alloc,
1033 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1034};
1035
0d54b217 1036static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1037 .quota_on = ext4_quota_on,
ac27a0ec
DK		 1038 .quota_off = vfs_quota_off,
1039 .quota_sync = vfs_quota_sync,
1040 .get_info = vfs_get_dqinfo,
1041 .set_info = vfs_set_dqinfo,
1042 .get_dqblk = vfs_get_dqblk,
1043 .set_dqblk = vfs_set_dqblk
1044};
1045#endif
1046
ee9b6d61 1047static const struct super_operations ext4_sops = {
617ba13b
MC		 1048 .alloc_inode = ext4_alloc_inode,
1049 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1050 .write_inode = ext4_write_inode,
1051 .dirty_inode = ext4_dirty_inode,
1052 .delete_inode = ext4_delete_inode,
1053 .put_super = ext4_put_super,
617ba13b 1054 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1055 .freeze_fs = ext4_freeze,
1056 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1057 .statfs = ext4_statfs,
1058 .remount_fs = ext4_remount,
1059 .clear_inode = ext4_clear_inode,
1060 .show_options = ext4_show_options,
ac27a0ec 1061#ifdef CONFIG_QUOTA
617ba13b
MC		 1062 .quota_read = ext4_quota_read,
1063 .quota_write = ext4_quota_write,
ac27a0ec 1064#endif
c39a7f84 1065 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1066};
1067
9ca92389
TT		 1068static const struct super_operations ext4_nojournal_sops = {
1069 .alloc_inode = ext4_alloc_inode,
1070 .destroy_inode = ext4_destroy_inode,
1071 .write_inode = ext4_write_inode,
1072 .dirty_inode = ext4_dirty_inode,
1073 .delete_inode = ext4_delete_inode,
1074 .write_super = ext4_write_super,
1075 .put_super = ext4_put_super,
1076 .statfs = ext4_statfs,
1077 .remount_fs = ext4_remount,
1078 .clear_inode = ext4_clear_inode,
1079 .show_options = ext4_show_options,
1080#ifdef CONFIG_QUOTA
1081 .quota_read = ext4_quota_read,
1082 .quota_write = ext4_quota_write,
1083#endif
1084 .bdev_try_to_free_page = bdev_try_to_free_page,
1085};
1086
39655164 1087static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1088 .fh_to_dentry = ext4_fh_to_dentry,
1089 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1090 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1091};
1092
1093enum {
1094 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1095 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1096 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1097 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1098 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1099 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1100 Opt_journal_update, Opt_journal_dev,
818d276c 1101 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1102 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1103 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1104 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1105 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1106 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1107 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1108 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
6fd058f7 1109 Opt_block_validity, Opt_noblock_validity,
5328e635
ES		 1110 Opt_inode_readahead_blks, Opt_journal_ioprio,
1111 Opt_discard, Opt_nodiscard,
ac27a0ec
DK		 1112};
1113
a447c093 1114static const match_table_t tokens = {
ac27a0ec
DK		 1115 {Opt_bsd_df, "bsddf"},
1116 {Opt_minix_df, "minixdf"},
1117 {Opt_grpid, "grpid"},
1118 {Opt_grpid, "bsdgroups"},
1119 {Opt_nogrpid, "nogrpid"},
1120 {Opt_nogrpid, "sysvgroups"},
1121 {Opt_resgid, "resgid=%u"},
1122 {Opt_resuid, "resuid=%u"},
1123 {Opt_sb, "sb=%u"},
1124 {Opt_err_cont, "errors=continue"},
1125 {Opt_err_panic, "errors=panic"},
1126 {Opt_err_ro, "errors=remount-ro"},
1127 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1128 {Opt_debug, "debug"},
1129 {Opt_oldalloc, "oldalloc"},
1130 {Opt_orlov, "orlov"},
1131 {Opt_user_xattr, "user_xattr"},
1132 {Opt_nouser_xattr, "nouser_xattr"},
1133 {Opt_acl, "acl"},
1134 {Opt_noacl, "noacl"},
ac27a0ec 1135 {Opt_noload, "noload"},
e3bb52ae 1136 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1137 {Opt_nobh, "nobh"},
1138 {Opt_bh, "bh"},
1139 {Opt_commit, "commit=%u"},
30773840
TT		 1140 {Opt_min_batch_time, "min_batch_time=%u"},
1141 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1142 {Opt_journal_update, "journal=update"},
ac27a0ec 1143 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1144 {Opt_journal_checksum, "journal_checksum"},
1145 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1146 {Opt_abort, "abort"},
1147 {Opt_data_journal, "data=journal"},
1148 {Opt_data_ordered, "data=ordered"},
1149 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1150 {Opt_data_err_abort, "data_err=abort"},
1151 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1152 {Opt_offusrjquota, "usrjquota="},
1153 {Opt_usrjquota, "usrjquota=%s"},
1154 {Opt_offgrpjquota, "grpjquota="},
1155 {Opt_grpjquota, "grpjquota=%s"},
1156 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1157 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1158 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1159 {Opt_grpquota, "grpquota"},
1160 {Opt_noquota, "noquota"},
1161 {Opt_quota, "quota"},
1162 {Opt_usrquota, "usrquota"},
1163 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1164 {Opt_barrier, "barrier"},
1165 {Opt_nobarrier, "nobarrier"},
25ec56b5 1166 {Opt_i_version, "i_version"},
c9de560d 1167 {Opt_stripe, "stripe=%u"},
ac27a0ec 1168 {Opt_resize, "resize"},
64769240 1169 {Opt_delalloc, "delalloc"},
dd919b98 1170 {Opt_nodelalloc, "nodelalloc"},
6fd058f7
TT		 1171 {Opt_block_validity, "block_validity"},
1172 {Opt_noblock_validity, "noblock_validity"},
240799cd 1173 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1174 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1175 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1176 {Opt_auto_da_alloc, "auto_da_alloc"},
1177 {Opt_noauto_da_alloc, "noauto_da_alloc"},
5328e635
ES		 1178 {Opt_discard, "discard"},
1179 {Opt_nodiscard, "nodiscard"},
f3f12faa 1180 {Opt_err, NULL},
ac27a0ec
DK		 1181};
1182
617ba13b 1183static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1184{
617ba13b 1185 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1186 char *options = (char *) *data;
1187
1188 if (!options || strncmp(options, "sb=", 3) != 0)
1189 return 1; /* Default location */
0b8e58a1 1190
ac27a0ec 1191 options += 3;
0b8e58a1 1192 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1193 sb_block = simple_strtoul(options, &options, 0);
1194 if (*options && *options != ',') {
4776004f 1195 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1196 (char *) *data);
1197 return 1;
1198 }
1199 if (*options == ',')
1200 options++;
1201 *data = (void *) options;
0b8e58a1 1202
ac27a0ec
DK		 1203 return sb_block;
1204}
1205
b3881f74
TT		 1206#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1207
2b2d6d01 1208static int parse_options(char *options, struct super_block *sb,
c3191067 1209 unsigned long *journal_devnum,
b3881f74 1210 unsigned int *journal_ioprio,
2b2d6d01 1211 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1212{
617ba13b 1213 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1214 char *p;
ac27a0ec
DK		 1215 substring_t args[MAX_OPT_ARGS];
1216 int data_opt = 0;
1217 int option;
1218#ifdef CONFIG_QUOTA
dfc5d03f 1219 int qtype, qfmt;
ac27a0ec
DK		 1220 char *qname;
1221#endif
1222
1223 if (!options)
1224 return 1;
1225
2b2d6d01 1226 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1227 int token;
1228 if (!*p)
1229 continue;
1230
1231 token = match_token(p, tokens, args);
1232 switch (token) {
1233 case Opt_bsd_df:
2b2d6d01 1234 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1235 break;
1236 case Opt_minix_df:
2b2d6d01 1237 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1238 break;
1239 case Opt_grpid:
2b2d6d01 1240 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1241 break;
1242 case Opt_nogrpid:
2b2d6d01 1243 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1244 break;
1245 case Opt_resuid:
1246 if (match_int(&args[0], &option))
1247 return 0;
1248 sbi->s_resuid = option;
1249 break;
1250 case Opt_resgid:
1251 if (match_int(&args[0], &option))
1252 return 0;
1253 sbi->s_resgid = option;
1254 break;
1255 case Opt_sb:
1256 /* handled by get_sb_block() instead of here */
1257 /* *sb_block = match_int(&args[0]); */
1258 break;
1259 case Opt_err_panic:
2b2d6d01
TT		 1260 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1261 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1262 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1263 break;
1264 case Opt_err_ro:
2b2d6d01
TT		 1265 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1266 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1267 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1268 break;
1269 case Opt_err_cont:
2b2d6d01
TT		 1270 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1271 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1272 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1273 break;
1274 case Opt_nouid32:
2b2d6d01 1275 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1276 break;
ac27a0ec 1277 case Opt_debug:
2b2d6d01 1278 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1279 break;
1280 case Opt_oldalloc:
2b2d6d01 1281 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1282 break;
1283 case Opt_orlov:
2b2d6d01 1284 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1285 break;
03010a33 1286#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1287 case Opt_user_xattr:
2b2d6d01 1288 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1289 break;
1290 case Opt_nouser_xattr:
2b2d6d01 1291 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1292 break;
1293#else
1294 case Opt_user_xattr:
1295 case Opt_nouser_xattr:
b31e1552 1296 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1297 break;
1298#endif
03010a33 1299#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1300 case Opt_acl:
1301 set_opt(sbi->s_mount_opt, POSIX_ACL);
1302 break;
1303 case Opt_noacl:
1304 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1305 break;
1306#else
1307 case Opt_acl:
1308 case Opt_noacl:
b31e1552 1309 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1310 break;
1311#endif
ac27a0ec
DK		 1312 case Opt_journal_update:
1313 /* @@@ FIXME */
1314 /* Eventually we will want to be able to create
1315 a journal file here. For now, only allow the
1316 user to specify an existing inode to be the
1317 journal file. */
1318 if (is_remount) {
b31e1552
ES		 1319 ext4_msg(sb, KERN_ERR,
1320 "Cannot specify journal on remount");
ac27a0ec
DK		 1321 return 0;
1322 }
2b2d6d01 1323 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1324 break;
ac27a0ec
DK		 1325 case Opt_journal_dev:
1326 if (is_remount) {
b31e1552
ES		 1327 ext4_msg(sb, KERN_ERR,
1328 "Cannot specify journal on remount");
ac27a0ec
DK		 1329 return 0;
1330 }
1331 if (match_int(&args[0], &option))
1332 return 0;
1333 *journal_devnum = option;
1334 break;
818d276c 1335 case Opt_journal_checksum:
d4da6c9c
LT		 1336 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1337 break;
818d276c
GS		 1338 case Opt_journal_async_commit:
1339 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
d4da6c9c 1340 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
818d276c 1341 break;
ac27a0ec 1342 case Opt_noload:
2b2d6d01 1343 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1344 break;
1345 case Opt_commit:
1346 if (match_int(&args[0], &option))
1347 return 0;
1348 if (option < 0)
1349 return 0;
1350 if (option == 0)
cd02ff0b 1351 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1352 sbi->s_commit_interval = HZ * option;
1353 break;
30773840
TT		 1354 case Opt_max_batch_time:
1355 if (match_int(&args[0], &option))
1356 return 0;
1357 if (option < 0)
1358 return 0;
1359 if (option == 0)
1360 option = EXT4_DEF_MAX_BATCH_TIME;
1361 sbi->s_max_batch_time = option;
1362 break;
1363 case Opt_min_batch_time:
1364 if (match_int(&args[0], &option))
1365 return 0;
1366 if (option < 0)
1367 return 0;
1368 sbi->s_min_batch_time = option;
1369 break;
ac27a0ec 1370 case Opt_data_journal:
617ba13b 1371 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1372 goto datacheck;
1373 case Opt_data_ordered:
617ba13b 1374 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1375 goto datacheck;
1376 case Opt_data_writeback:
617ba13b 1377 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1378 datacheck:
1379 if (is_remount) {
617ba13b 1380 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec 1381 != data_opt) {
b31e1552
ES		 1382 ext4_msg(sb, KERN_ERR,
1383 "Cannot change data mode on remount");
ac27a0ec
DK		 1384 return 0;
1385 }
1386 } else {
617ba13b 1387 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1388 sbi->s_mount_opt |= data_opt;
1389 }
1390 break;
5bf5683a
HK		 1391 case Opt_data_err_abort:
1392 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1393 break;
1394 case Opt_data_err_ignore:
1395 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1396 break;
ac27a0ec
DK		 1397#ifdef CONFIG_QUOTA
1398 case Opt_usrjquota:
1399 qtype = USRQUOTA;
1400 goto set_qf_name;
1401 case Opt_grpjquota:
1402 qtype = GRPQUOTA;
1403set_qf_name:
17bd13b3 1404 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1405 !sbi->s_qf_names[qtype]) {
b31e1552
ES		 1406 ext4_msg(sb, KERN_ERR,
1407 "Cannot change journaled "
1408 "quota options when quota turned on");
ac27a0ec
DK		 1409 return 0;
1410 }
1411 qname = match_strdup(&args[0]);
1412 if (!qname) {
b31e1552
ES		 1413 ext4_msg(sb, KERN_ERR,
1414 "Not enough memory for "
1415 "storing quotafile name");
ac27a0ec
DK		 1416 return 0;
1417 }
1418 if (sbi->s_qf_names[qtype] &&
1419 strcmp(sbi->s_qf_names[qtype], qname)) {
b31e1552
ES		 1420 ext4_msg(sb, KERN_ERR,
1421 "%s quota file already "
1422 "specified", QTYPE2NAME(qtype));
ac27a0ec
DK		 1423 kfree(qname);
1424 return 0;
1425 }
1426 sbi->s_qf_names[qtype] = qname;
1427 if (strchr(sbi->s_qf_names[qtype], '/')) {
b31e1552
ES		 1428 ext4_msg(sb, KERN_ERR,
1429 "quotafile must be on "
1430 "filesystem root");
ac27a0ec
DK		 1431 kfree(sbi->s_qf_names[qtype]);
1432 sbi->s_qf_names[qtype] = NULL;
1433 return 0;
1434 }
1435 set_opt(sbi->s_mount_opt, QUOTA);
1436 break;
1437 case Opt_offusrjquota:
1438 qtype = USRQUOTA;
1439 goto clear_qf_name;
1440 case Opt_offgrpjquota:
1441 qtype = GRPQUOTA;
1442clear_qf_name:
17bd13b3 1443 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1444 sbi->s_qf_names[qtype]) {
b31e1552 1445 ext4_msg(sb, KERN_ERR, "Cannot change "
2c8be6b2 1446 "journaled quota options when "
b31e1552 1447 "quota turned on");
ac27a0ec
DK		 1448 return 0;
1449 }
1450 /*
1451 * The space will be released later when all options
1452 * are confirmed to be correct
1453 */
1454 sbi->s_qf_names[qtype] = NULL;
1455 break;
1456 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1457 qfmt = QFMT_VFS_OLD;
1458 goto set_qf_format;
ac27a0ec 1459 case Opt_jqfmt_vfsv0:
dfc5d03f 1460 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1461 goto set_qf_format;
1462 case Opt_jqfmt_vfsv1:
1463 qfmt = QFMT_VFS_V1;
dfc5d03f 1464set_qf_format:
17bd13b3 1465 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1466 sbi->s_jquota_fmt != qfmt) {
b31e1552 1467 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1468 "journaled quota options when "
b31e1552 1469 "quota turned on");
dfc5d03f
JK		 1470 return 0;
1471 }
1472 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1473 break;
1474 case Opt_quota:
1475 case Opt_usrquota:
1476 set_opt(sbi->s_mount_opt, QUOTA);
1477 set_opt(sbi->s_mount_opt, USRQUOTA);
1478 break;
1479 case Opt_grpquota:
1480 set_opt(sbi->s_mount_opt, QUOTA);
1481 set_opt(sbi->s_mount_opt, GRPQUOTA);
1482 break;
1483 case Opt_noquota:
17bd13b3 1484 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1485 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1486 "options when quota turned on");
ac27a0ec
DK		 1487 return 0;
1488 }
1489 clear_opt(sbi->s_mount_opt, QUOTA);
1490 clear_opt(sbi->s_mount_opt, USRQUOTA);
1491 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1492 break;
1493#else
1494 case Opt_quota:
1495 case Opt_usrquota:
1496 case Opt_grpquota:
b31e1552
ES		 1497 ext4_msg(sb, KERN_ERR,
1498 "quota options not supported");
cd59e7b9 1499 break;
ac27a0ec
DK		 1500 case Opt_usrjquota:
1501 case Opt_grpjquota:
1502 case Opt_offusrjquota:
1503 case Opt_offgrpjquota:
1504 case Opt_jqfmt_vfsold:
1505 case Opt_jqfmt_vfsv0:
5a20bdfc 1506 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1507 ext4_msg(sb, KERN_ERR,
1508 "journaled quota options not supported");
ac27a0ec
DK		 1509 break;
1510 case Opt_noquota:
1511 break;
1512#endif
1513 case Opt_abort:
4ab2f15b 1514 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1515 break;
06705bff
TT		 1516 case Opt_nobarrier:
1517 clear_opt(sbi->s_mount_opt, BARRIER);
1518 break;
ac27a0ec 1519 case Opt_barrier:
06705bff
TT		 1520 if (match_int(&args[0], &option)) {
1521 set_opt(sbi->s_mount_opt, BARRIER);
1522 break;
1523 }
ac27a0ec
DK		 1524 if (option)
1525 set_opt(sbi->s_mount_opt, BARRIER);
1526 else
1527 clear_opt(sbi->s_mount_opt, BARRIER);
1528 break;
1529 case Opt_ignore:
1530 break;
1531 case Opt_resize:
1532 if (!is_remount) {
b31e1552
ES		 1533 ext4_msg(sb, KERN_ERR,
1534 "resize option only available "
1535 "for remount");
ac27a0ec
DK		 1536 return 0;
1537 }
1538 if (match_int(&args[0], &option) != 0)
1539 return 0;
1540 *n_blocks_count = option;
1541 break;
1542 case Opt_nobh:
1543 set_opt(sbi->s_mount_opt, NOBH);
1544 break;
1545 case Opt_bh:
1546 clear_opt(sbi->s_mount_opt, NOBH);
1547 break;
25ec56b5
JNC		 1548 case Opt_i_version:
1549 set_opt(sbi->s_mount_opt, I_VERSION);
1550 sb->s_flags |= MS_I_VERSION;
1551 break;
dd919b98
AK		 1552 case Opt_nodelalloc:
1553 clear_opt(sbi->s_mount_opt, DELALLOC);
1554 break;
c9de560d
AT		 1555 case Opt_stripe:
1556 if (match_int(&args[0], &option))
1557 return 0;
1558 if (option < 0)
1559 return 0;
1560 sbi->s_stripe = option;
1561 break;
64769240
AT		 1562 case Opt_delalloc:
1563 set_opt(sbi->s_mount_opt, DELALLOC);
1564 break;
6fd058f7
TT		 1565 case Opt_block_validity:
1566 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1567 break;
1568 case Opt_noblock_validity:
1569 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1570 break;
240799cd
TT		 1571 case Opt_inode_readahead_blks:
1572 if (match_int(&args[0], &option))
1573 return 0;
1574 if (option < 0 || option > (1 << 30))
1575 return 0;
f7c43950 1576 if (!is_power_of_2(option)) {
b31e1552
ES		 1577 ext4_msg(sb, KERN_ERR,
1578 "EXT4-fs: inode_readahead_blks"
1579 " must be a power of 2");
3197ebdb
TT		 1580 return 0;
1581 }
240799cd
TT		 1582 sbi->s_inode_readahead_blks = option;
1583 break;
b3881f74
TT		 1584 case Opt_journal_ioprio:
1585 if (match_int(&args[0], &option))
1586 return 0;
1587 if (option < 0 || option > 7)
1588 break;
1589 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1590 option);
1591 break;
06705bff
TT		 1592 case Opt_noauto_da_alloc:
1593 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1594 break;
afd4672d 1595 case Opt_auto_da_alloc:
06705bff
TT		 1596 if (match_int(&args[0], &option)) {
1597 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1598 break;
1599 }
afd4672d
TT		 1600 if (option)
1601 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1602 else
1603 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1604 break;
5328e635
ES		 1605 case Opt_discard:
1606 set_opt(sbi->s_mount_opt, DISCARD);
1607 break;
1608 case Opt_nodiscard:
1609 clear_opt(sbi->s_mount_opt, DISCARD);
1610 break;
ac27a0ec 1611 default:
b31e1552
ES		 1612 ext4_msg(sb, KERN_ERR,
1613 "Unrecognized mount option \"%s\" "
1614 "or missing value", p);
ac27a0ec
DK		 1615 return 0;
1616 }
1617 }
1618#ifdef CONFIG_QUOTA
1619 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1620 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1621 sbi->s_qf_names[USRQUOTA])
1622 clear_opt(sbi->s_mount_opt, USRQUOTA);
1623
617ba13b 1624 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1625 sbi->s_qf_names[GRPQUOTA])
1626 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1627
1628 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1629 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1630 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b 1631 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
b31e1552
ES		 1632 ext4_msg(sb, KERN_ERR, "old and new quota "
1633 "format mixing");
ac27a0ec
DK		 1634 return 0;
1635 }
1636
1637 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1638 ext4_msg(sb, KERN_ERR, "journaled quota format "
1639 "not specified");
ac27a0ec
DK		 1640 return 0;
1641 }
1642 } else {
1643 if (sbi->s_jquota_fmt) {
b31e1552 1644 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1645 "specified with no journaling "
b31e1552 1646 "enabled");
ac27a0ec
DK		 1647 return 0;
1648 }
1649 }
1650#endif
1651 return 1;
1652}
1653
617ba13b 1654static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1655 int read_only)
1656{
617ba13b 1657 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1658 int res = 0;
1659
617ba13b 1660 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1661 ext4_msg(sb, KERN_ERR, "revision level too high, "
1662 "forcing read-only mode");
ac27a0ec
DK		 1663 res = MS_RDONLY;
1664 }
1665 if (read_only)
1666 return res;
617ba13b 1667 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1668 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1669 "running e2fsck is recommended");
617ba13b 1670 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1671 ext4_msg(sb, KERN_WARNING,
1672 "warning: mounting fs with errors, "
1673 "running e2fsck is recommended");
ac27a0ec
DK		 1674 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1675 le16_to_cpu(es->s_mnt_count) >=
1676 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1677 ext4_msg(sb, KERN_WARNING,
1678 "warning: maximal mount count reached, "
1679 "running e2fsck is recommended");
ac27a0ec
DK		 1680 else if (le32_to_cpu(es->s_checkinterval) &&
1681 (le32_to_cpu(es->s_lastcheck) +
1682 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1683 ext4_msg(sb, KERN_WARNING,
1684 "warning: checktime reached, "
1685 "running e2fsck is recommended");
0b8e58a1 1686 if (!sbi->s_journal)
0390131b 1687 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1688 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1689 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1690 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1691 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1692 ext4_update_dynamic_rev(sb);
0390131b
FM		 1693 if (sbi->s_journal)
1694 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1695
e2d67052 1696 ext4_commit_super(sb, 1);
ac27a0ec 1697 if (test_opt(sb, DEBUG))
a9df9a49 1698 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
7f4520cc 1699 "bpg=%lu, ipg=%lu, mo=%04x]\n",
ac27a0ec
DK		 1700 sb->s_blocksize,
1701 sbi->s_groups_count,
617ba13b
MC		 1702 EXT4_BLOCKS_PER_GROUP(sb),
1703 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1704 sbi->s_mount_opt);
1705
ac27a0ec
DK		 1706 return res;
1707}
1708
772cb7c8
JS		 1709static int ext4_fill_flex_info(struct super_block *sb)
1710{
1711 struct ext4_sb_info *sbi = EXT4_SB(sb);
1712 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1713 ext4_group_t flex_group_count;
1714 ext4_group_t flex_group;
1715 int groups_per_flex = 0;
c5ca7c76 1716 size_t size;
772cb7c8
JS		 1717 int i;
1718
503358ae
TT		 1719 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1720 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1721
1722 if (groups_per_flex < 2) {
772cb7c8
JS		 1723 sbi->s_log_groups_per_flex = 0;
1724 return 1;
1725 }
1726
c62a11fd
FB		 1727 /* We allocate both existing and potentially added groups */
1728 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1729 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1730 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1731 size = flex_group_count * sizeof(struct flex_groups);
1732 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1733 if (sbi->s_flex_groups == NULL) {
1734 sbi->s_flex_groups = vmalloc(size);
1735 if (sbi->s_flex_groups)
1736 memset(sbi->s_flex_groups, 0, size);
1737 }
772cb7c8 1738 if (sbi->s_flex_groups == NULL) {
b31e1552
ES		 1739 ext4_msg(sb, KERN_ERR, "not enough memory for "
1740 "%u flex groups", flex_group_count);
772cb7c8
JS		 1741 goto failed;
1742 }
772cb7c8 1743
772cb7c8 1744 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1745 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1746
1747 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1748 atomic_add(ext4_free_inodes_count(sb, gdp),
1749 &sbi->s_flex_groups[flex_group].free_inodes);
1750 atomic_add(ext4_free_blks_count(sb, gdp),
1751 &sbi->s_flex_groups[flex_group].free_blocks);
1752 atomic_add(ext4_used_dirs_count(sb, gdp),
1753 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1754 }
1755
1756 return 1;
1757failed:
1758 return 0;
1759}
1760
717d50e4
AD		 1761__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1762 struct ext4_group_desc *gdp)
1763{
1764 __u16 crc = 0;
1765
1766 if (sbi->s_es->s_feature_ro_compat &
1767 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1768 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1769 __le32 le_group = cpu_to_le32(block_group);
1770
1771 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1772 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1773 crc = crc16(crc, (__u8 *)gdp, offset);
1774 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1775 /* for checksum of struct ext4_group_desc do the rest...*/
1776 if ((sbi->s_es->s_feature_incompat &
1777 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1778 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1779 crc = crc16(crc, (__u8 *)gdp + offset,
1780 le16_to_cpu(sbi->s_es->s_desc_size) -
1781 offset);
1782 }
1783
1784 return cpu_to_le16(crc);
1785}
1786
1787int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1788 struct ext4_group_desc *gdp)
1789{
1790 if ((sbi->s_es->s_feature_ro_compat &
1791 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1792 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1793 return 0;
1794
1795 return 1;
1796}
1797
ac27a0ec 1798/* Called at mount-time, super-block is locked */
197cd65a 1799static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1800{
617ba13b
MC		 1801 struct ext4_sb_info *sbi = EXT4_SB(sb);
1802 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1803 ext4_fsblk_t last_block;
bd81d8ee
LV		 1804 ext4_fsblk_t block_bitmap;
1805 ext4_fsblk_t inode_bitmap;
1806 ext4_fsblk_t inode_table;
ce421581 1807 int flexbg_flag = 0;
fd2d4291 1808 ext4_group_t i;
ac27a0ec 1809
ce421581
JS		 1810 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1811 flexbg_flag = 1;
1812
af5bc92d 1813 ext4_debug("Checking group descriptors");
ac27a0ec 1814
197cd65a
AM		 1815 for (i = 0; i < sbi->s_groups_count; i++) {
1816 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1817
ce421581 1818 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1819 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1820 else
1821 last_block = first_block +
617ba13b 1822 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1823
8fadc143 1824 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1825 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1826 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1827 "Block bitmap for group %u not in group "
b31e1552 1828 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1829 return 0;
1830 }
8fadc143 1831 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1832 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1833 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1834 "Inode bitmap for group %u not in group "
b31e1552 1835 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1836 return 0;
1837 }
8fadc143 1838 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1839 if (inode_table < first_block ||
2b2d6d01 1840 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1841 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1842 "Inode table for group %u not in group "
b31e1552 1843 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1844 return 0;
1845 }
955ce5f5 1846 ext4_lock_group(sb, i);
717d50e4 1847 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1848 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1849 "Checksum for group %u failed (%u!=%u)",
1850 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1851 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1852 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1853 ext4_unlock_group(sb, i);
8a266467 1854 return 0;
7ee1ec4c 1855 }
717d50e4 1856 }
955ce5f5 1857 ext4_unlock_group(sb, i);
ce421581
JS		 1858 if (!flexbg_flag)
1859 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1860 }
1861
bd81d8ee 1862 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 1863 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1864 return 1;
1865}
1866
617ba13b 1867/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1868 * the superblock) which were deleted from all directories, but held open by
1869 * a process at the time of a crash. We walk the list and try to delete these
1870 * inodes at recovery time (only with a read-write filesystem).
1871 *
1872 * In order to keep the orphan inode chain consistent during traversal (in
1873 * case of crash during recovery), we link each inode into the superblock
1874 * orphan list_head and handle it the same way as an inode deletion during
1875 * normal operation (which journals the operations for us).
1876 *
1877 * We only do an iget() and an iput() on each inode, which is very safe if we
1878 * accidentally point at an in-use or already deleted inode. The worst that
1879 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1880 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1881 * e2fsck was run on this filesystem, and it must have already done the orphan
1882 * inode cleanup for us, so we can safely abort without any further action.
1883 */
2b2d6d01
TT		 1884static void ext4_orphan_cleanup(struct super_block *sb,
1885 struct ext4_super_block *es)
ac27a0ec
DK		 1886{
1887 unsigned int s_flags = sb->s_flags;
1888 int nr_orphans = 0, nr_truncates = 0;
1889#ifdef CONFIG_QUOTA
1890 int i;
1891#endif
1892 if (!es->s_last_orphan) {
1893 jbd_debug(4, "no orphan inodes to clean up\n");
1894 return;
1895 }
1896
a8f48a95 1897 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 1898 ext4_msg(sb, KERN_ERR, "write access "
1899 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 1900 return;
1901 }
1902
617ba13b 1903 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1904 if (es->s_last_orphan)
1905 jbd_debug(1, "Errors on filesystem, "
1906 "clearing orphan list.\n");
1907 es->s_last_orphan = 0;
1908 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1909 return;
1910 }
1911
1912 if (s_flags & MS_RDONLY) {
b31e1552 1913 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 1914 sb->s_flags &= ~MS_RDONLY;
1915 }
1916#ifdef CONFIG_QUOTA
1917 /* Needed for iput() to work correctly and not trash data */
1918 sb->s_flags |= MS_ACTIVE;
1919 /* Turn on quotas so that they are updated correctly */
1920 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1921 if (EXT4_SB(sb)->s_qf_names[i]) {
1922 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 1923 if (ret < 0)
b31e1552
ES		 1924 ext4_msg(sb, KERN_ERR,
1925 "Cannot turn on journaled "
1926 "quota: error %d", ret);
ac27a0ec
DK		 1927 }
1928 }
1929#endif
1930
1931 while (es->s_last_orphan) {
1932 struct inode *inode;
1933
97bd42b9
JB		 1934 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1935 if (IS_ERR(inode)) {
ac27a0ec
DK		 1936 es->s_last_orphan = 0;
1937 break;
1938 }
1939
617ba13b 1940 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
a269eb18 1941 vfs_dq_init(inode);
ac27a0ec 1942 if (inode->i_nlink) {
b31e1552
ES		 1943 ext4_msg(sb, KERN_DEBUG,
1944 "%s: truncating inode %lu to %lld bytes",
46e665e9 1945 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1946 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1947 inode->i_ino, inode->i_size);
617ba13b 1948 ext4_truncate(inode);
ac27a0ec
DK		 1949 nr_truncates++;
1950 } else {
b31e1552
ES		 1951 ext4_msg(sb, KERN_DEBUG,
1952 "%s: deleting unreferenced inode %lu",
46e665e9 1953 __func__, inode->i_ino);
ac27a0ec
DK		 1954 jbd_debug(2, "deleting unreferenced inode %lu\n",
1955 inode->i_ino);
1956 nr_orphans++;
1957 }
1958 iput(inode); /* The delete magic happens here! */
1959 }
1960
2b2d6d01 1961#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1962
1963 if (nr_orphans)
b31e1552
ES		 1964 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1965 PLURAL(nr_orphans));
ac27a0ec 1966 if (nr_truncates)
b31e1552
ES		 1967 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1968 PLURAL(nr_truncates));
ac27a0ec
DK		 1969#ifdef CONFIG_QUOTA
1970 /* Turn quotas off */
1971 for (i = 0; i < MAXQUOTAS; i++) {
1972 if (sb_dqopt(sb)->files[i])
6f28e087 1973 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1974 }
1975#endif
1976 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1977}
0b8e58a1 1978
cd2291a4
ES		 1979/*
1980 * Maximal extent format file size.
1981 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1982 * extent format containers, within a sector_t, and within i_blocks
1983 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1984 * so that won't be a limiting factor.
1985 *
1986 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1987 */
f287a1a5 1988static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1989{
1990 loff_t res;
1991 loff_t upper_limit = MAX_LFS_FILESIZE;
1992
1993 /* small i_blocks in vfs inode? */
f287a1a5 1994 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 1995 /*
90c699a9 1996 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 1997 * i_block represent total blocks in 512 bytes
1998 * 32 == size of vfs inode i_blocks * 8
1999 */
2000 upper_limit = (1LL << 32) - 1;
2001
2002 /* total blocks in file system block size */
2003 upper_limit >>= (blkbits - 9);
2004 upper_limit <<= blkbits;
2005 }
2006
2007 /* 32-bit extent-start container, ee_block */
2008 res = 1LL << 32;
2009 res <<= blkbits;
2010 res -= 1;
2011
2012 /* Sanity check against vm- & vfs- imposed limits */
2013 if (res > upper_limit)
2014 res = upper_limit;
2015
2016 return res;
2017}
ac27a0ec 2018
ac27a0ec 2019/*
cd2291a4 2020 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2021 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2022 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2023 */
f287a1a5 2024static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2025{
617ba13b 2026 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2027 int meta_blocks;
2028 loff_t upper_limit;
0b8e58a1
AD		 2029 /* This is calculated to be the largest file size for a dense, block
2030 * mapped file such that the file's total number of 512-byte sectors,
2031 * including data and all indirect blocks, does not exceed (2^48 - 1).
2032 *
2033 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2034 * number of 512-byte sectors of the file.
0fc1b451
AK		 2035 */
2036
f287a1a5 2037 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2038 /*
90c699a9 2039 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2040 * the inode i_block field represents total file blocks in
2041 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2042 */
2043 upper_limit = (1LL << 32) - 1;
2044
2045 /* total blocks in file system block size */
2046 upper_limit >>= (bits - 9);
2047
2048 } else {
8180a562
AK		 2049 /*
2050 * We use 48 bit ext4_inode i_blocks
2051 * With EXT4_HUGE_FILE_FL set the i_blocks
2052 * represent total number of blocks in
2053 * file system block size
2054 */
0fc1b451
AK		 2055 upper_limit = (1LL << 48) - 1;
2056
0fc1b451
AK		 2057 }
2058
2059 /* indirect blocks */
2060 meta_blocks = 1;
2061 /* double indirect blocks */
2062 meta_blocks += 1 + (1LL << (bits-2));
2063 /* tripple indirect blocks */
2064 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2065
2066 upper_limit -= meta_blocks;
2067 upper_limit <<= bits;
ac27a0ec
DK		 2068
2069 res += 1LL << (bits-2);
2070 res += 1LL << (2*(bits-2));
2071 res += 1LL << (3*(bits-2));
2072 res <<= bits;
2073 if (res > upper_limit)
2074 res = upper_limit;
0fc1b451
AK		 2075
2076 if (res > MAX_LFS_FILESIZE)
2077 res = MAX_LFS_FILESIZE;
2078
ac27a0ec
DK		 2079 return res;
2080}
2081
617ba13b 2082static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2083 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2084{
617ba13b 2085 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2086 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2087 int has_super = 0;
2088
2089 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2090
617ba13b 2091 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2092 nr < first_meta_bg)
70bbb3e0 2093 return logical_sb_block + nr + 1;
ac27a0ec 2094 bg = sbi->s_desc_per_block * nr;
617ba13b 2095 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2096 has_super = 1;
0b8e58a1 2097
617ba13b 2098 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2099}
2100
c9de560d
AT		 2101/**
2102 * ext4_get_stripe_size: Get the stripe size.
2103 * @sbi: In memory super block info
2104 *
2105 * If we have specified it via mount option, then
2106 * use the mount option value. If the value specified at mount time is
2107 * greater than the blocks per group use the super block value.
2108 * If the super block value is greater than blocks per group return 0.
2109 * Allocator needs it be less than blocks per group.
2110 *
2111 */
2112static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2113{
2114 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2115 unsigned long stripe_width =
2116 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2117
2118 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2119 return sbi->s_stripe;
2120
2121 if (stripe_width <= sbi->s_blocks_per_group)
2122 return stripe_width;
2123
2124 if (stride <= sbi->s_blocks_per_group)
2125 return stride;
2126
2127 return 0;
2128}
ac27a0ec 2129
3197ebdb
TT		 2130/* sysfs supprt */
2131
2132struct ext4_attr {
2133 struct attribute attr;
2134 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2135 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2136 const char *, size_t);
2137 int offset;
2138};
2139
2140static int parse_strtoul(const char *buf,
2141 unsigned long max, unsigned long *value)
2142{
2143 char *endp;
2144
e7d2860b
AGR		 2145 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2146 endp = skip_spaces(endp);
3197ebdb
TT		 2147 if (*endp || *value > max)
2148 return -EINVAL;
2149
2150 return 0;
2151}
2152
2153static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2154 struct ext4_sb_info *sbi,
2155 char *buf)
2156{
2157 return snprintf(buf, PAGE_SIZE, "%llu\n",
2158 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2159}
2160
2161static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2162 struct ext4_sb_info *sbi, char *buf)
2163{
2164 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2165
2166 return snprintf(buf, PAGE_SIZE, "%lu\n",
2167 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2168 sbi->s_sectors_written_start) >> 1);
2169}
2170
2171static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2172 struct ext4_sb_info *sbi, char *buf)
2173{
2174 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2175
2176 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2177 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2178 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2179 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2180}
2181
2182static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2183 struct ext4_sb_info *sbi,
2184 const char *buf, size_t count)
2185{
2186 unsigned long t;
2187
2188 if (parse_strtoul(buf, 0x40000000, &t))
2189 return -EINVAL;
2190
f7c43950 2191 if (!is_power_of_2(t))
3197ebdb
TT		 2192 return -EINVAL;
2193
2194 sbi->s_inode_readahead_blks = t;
2195 return count;
2196}
2197
2198static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2199 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2200{
2201 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2202
2203 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2204}
2205
2206static ssize_t sbi_ui_store(struct ext4_attr *a,
2207 struct ext4_sb_info *sbi,
2208 const char *buf, size_t count)
2209{
2210 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2211 unsigned long t;
2212
2213 if (parse_strtoul(buf, 0xffffffff, &t))
2214 return -EINVAL;
2215 *ui = t;
2216 return count;
2217}
2218
2219#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2220static struct ext4_attr ext4_attr_##_name = { \
2221 .attr = {.name = __stringify(_name), .mode = _mode }, \
2222 .show = _show, \
2223 .store = _store, \
2224 .offset = offsetof(struct ext4_sb_info, _elname), \
2225}
2226#define EXT4_ATTR(name, mode, show, store) \
2227static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2228
2229#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2230#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2231#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2232 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2233#define ATTR_LIST(name) &ext4_attr_##name.attr
2234
2235EXT4_RO_ATTR(delayed_allocation_blocks);
2236EXT4_RO_ATTR(session_write_kbytes);
2237EXT4_RO_ATTR(lifetime_write_kbytes);
2238EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2239 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2240EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2241EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2242EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2243EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2244EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2245EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2246EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2247EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2248
2249static struct attribute *ext4_attrs[] = {
2250 ATTR_LIST(delayed_allocation_blocks),
2251 ATTR_LIST(session_write_kbytes),
2252 ATTR_LIST(lifetime_write_kbytes),
2253 ATTR_LIST(inode_readahead_blks),
11013911 2254 ATTR_LIST(inode_goal),
3197ebdb
TT		 2255 ATTR_LIST(mb_stats),
2256 ATTR_LIST(mb_max_to_scan),
2257 ATTR_LIST(mb_min_to_scan),
2258 ATTR_LIST(mb_order2_req),
2259 ATTR_LIST(mb_stream_req),
2260 ATTR_LIST(mb_group_prealloc),
55138e0b 2261 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2262 NULL,
2263};
2264
2265static ssize_t ext4_attr_show(struct kobject *kobj,
2266 struct attribute *attr, char *buf)
2267{
2268 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2269 s_kobj);
2270 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2271
2272 return a->show ? a->show(a, sbi, buf) : 0;
2273}
2274
2275static ssize_t ext4_attr_store(struct kobject *kobj,
2276 struct attribute *attr,
2277 const char *buf, size_t len)
2278{
2279 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2280 s_kobj);
2281 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2282
2283 return a->store ? a->store(a, sbi, buf, len) : 0;
2284}
2285
2286static void ext4_sb_release(struct kobject *kobj)
2287{
2288 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2289 s_kobj);
2290 complete(&sbi->s_kobj_unregister);
2291}
2292
2293
2294static struct sysfs_ops ext4_attr_ops = {
2295 .show = ext4_attr_show,
2296 .store = ext4_attr_store,
2297};
2298
2299static struct kobj_type ext4_ktype = {
2300 .default_attrs = ext4_attrs,
2301 .sysfs_ops = &ext4_attr_ops,
2302 .release = ext4_sb_release,
2303};
2304
a13fb1a4
ES		 2305/*
2306 * Check whether this filesystem can be mounted based on
2307 * the features present and the RDONLY/RDWR mount requested.
2308 * Returns 1 if this filesystem can be mounted as requested,
2309 * 0 if it cannot be.
2310 */
2311static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2312{
2313 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2314 ext4_msg(sb, KERN_ERR,
2315 "Couldn't mount because of "
2316 "unsupported optional features (%x)",
2317 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2318 ~EXT4_FEATURE_INCOMPAT_SUPP));
2319 return 0;
2320 }
2321
2322 if (readonly)
2323 return 1;
2324
2325 /* Check that feature set is OK for a read-write mount */
2326 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2327 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2328 "unsupported optional features (%x)",
2329 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2330 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2331 return 0;
2332 }
2333 /*
2334 * Large file size enabled file system can only be mounted
2335 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2336 */
2337 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2338 if (sizeof(blkcnt_t) < sizeof(u64)) {
2339 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2340 "cannot be mounted RDWR without "
2341 "CONFIG_LBDAF");
2342 return 0;
2343 }
2344 }
2345 return 1;
2346}
2347
2b2d6d01 2348static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2349 __releases(kernel_lock)
2350 __acquires(kernel_lock)
ac27a0ec 2351{
2b2d6d01 2352 struct buffer_head *bh;
617ba13b
MC		 2353 struct ext4_super_block *es = NULL;
2354 struct ext4_sb_info *sbi;
2355 ext4_fsblk_t block;
2356 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2357 ext4_fsblk_t logical_sb_block;
ac27a0ec 2358 unsigned long offset = 0;
ac27a0ec
DK		 2359 unsigned long journal_devnum = 0;
2360 unsigned long def_mount_opts;
2361 struct inode *root;
9f6200bb 2362 char *cp;
0390131b 2363 const char *descr;
1d1fe1ee 2364 int ret = -EINVAL;
ac27a0ec 2365 int blocksize;
4ec11028
TT		 2366 unsigned int db_count;
2367 unsigned int i;
f287a1a5 2368 int needs_recovery, has_huge_files;
bd81d8ee 2369 __u64 blocks_count;
833f4077 2370 int err;
b3881f74 2371 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2372
2373 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2374 if (!sbi)
2375 return -ENOMEM;
705895b6
PE		 2376
2377 sbi->s_blockgroup_lock =
2378 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2379 if (!sbi->s_blockgroup_lock) {
2380 kfree(sbi);
2381 return -ENOMEM;
2382 }
ac27a0ec
DK		 2383 sb->s_fs_info = sbi;
2384 sbi->s_mount_opt = 0;
617ba13b
MC		 2385 sbi->s_resuid = EXT4_DEF_RESUID;
2386 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2387 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2388 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2389 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2390 sectors[1]);
ac27a0ec
DK		 2391
2392 unlock_kernel();
2393
9f6200bb
TT		 2394 /* Cleanup superblock name */
2395 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2396 *cp = '!';
2397
617ba13b 2398 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2399 if (!blocksize) {
b31e1552 2400 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2401 goto out_fail;
2402 }
2403
2404 /*
617ba13b 2405 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2406 * block sizes. We need to calculate the offset from buffer start.
2407 */
617ba13b 2408 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2409 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2410 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2411 } else {
70bbb3e0 2412 logical_sb_block = sb_block;
ac27a0ec
DK		 2413 }
2414
70bbb3e0 2415 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 2416 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 2417 goto out_fail;
2418 }
2419 /*
2420 * Note: s_es must be initialized as soon as possible because
617ba13b 2421 * some ext4 macro-instructions depend on its value
ac27a0ec 2422 */
617ba13b 2423 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2424 sbi->s_es = es;
2425 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2426 if (sb->s_magic != EXT4_SUPER_MAGIC)
2427 goto cantfind_ext4;
afc32f7e 2428 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2429
2430 /* Set defaults before we parse the mount options */
2431 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2432 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2433 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2434 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2435 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2436 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2437 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2438#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2439 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2440 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2441#endif
03010a33 2442#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2443 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2444 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2445#endif
617ba13b
MC		 2446 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2447 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2448 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2449 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2450 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2451 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2452
2453 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2454 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2455 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2456 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2457 else
2458 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2459
2460 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2461 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2462 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2463 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2464 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2465
571640ca 2466 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2467
dd919b98
AK		 2468 /*
2469 * enable delayed allocation by default
2470 * Use -o nodelalloc to turn it off
2471 */
2472 set_opt(sbi->s_mount_opt, DELALLOC);
2473
b3881f74
TT		 2474 if (!parse_options((char *) data, sb, &journal_devnum,
2475 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2476 goto failed_mount;
2477
2478 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2479 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2480
617ba13b
MC		 2481 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2482 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2483 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2484 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 2485 ext4_msg(sb, KERN_WARNING,
2486 "feature flags set on rev 0 fs, "
2487 "running e2fsck is recommended");
469108ff 2488
ac27a0ec
DK		 2489 /*
2490 * Check feature flags regardless of the revision level, since we
2491 * previously didn't change the revision level when setting the flags,
2492 * so there is a chance incompat flags are set on a rev 0 filesystem.
2493 */
a13fb1a4 2494 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 2495 goto failed_mount;
a13fb1a4 2496
ac27a0ec
DK		 2497 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2498
617ba13b
MC		 2499 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2500 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 2501 ext4_msg(sb, KERN_ERR,
2502 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 2503 goto failed_mount;
2504 }
2505
ac27a0ec 2506 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2507 /* Validate the filesystem blocksize */
2508 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 2509 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 2510 blocksize);
ac27a0ec
DK		 2511 goto failed_mount;
2512 }
2513
2b2d6d01 2514 brelse(bh);
70bbb3e0
AM		 2515 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2516 offset = do_div(logical_sb_block, blocksize);
2517 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 2518 if (!bh) {
b31e1552
ES		 2519 ext4_msg(sb, KERN_ERR,
2520 "Can't read superblock on 2nd try");
ac27a0ec
DK		 2521 goto failed_mount;
2522 }
617ba13b 2523 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2524 sbi->s_es = es;
617ba13b 2525 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 2526 ext4_msg(sb, KERN_ERR,
2527 "Magic mismatch, very weird!");
ac27a0ec
DK		 2528 goto failed_mount;
2529 }
2530 }
2531
a13fb1a4
ES		 2532 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2533 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 2534 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2535 has_huge_files);
2536 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2537
617ba13b
MC		 2538 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2539 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2540 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2541 } else {
2542 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2543 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2544 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2545 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2546 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 2547 ext4_msg(sb, KERN_ERR,
2548 "unsupported inode size: %d",
2b2d6d01 2549 sbi->s_inode_size);
ac27a0ec
DK		 2550 goto failed_mount;
2551 }
ef7f3835
KS		 2552 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2553 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2554 }
0b8e58a1 2555
0d1ee42f
AR		 2556 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2557 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2558 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2559 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2560 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 2561 ext4_msg(sb, KERN_ERR,
2562 "unsupported descriptor size %lu",
0d1ee42f
AR		 2563 sbi->s_desc_size);
2564 goto failed_mount;
2565 }
2566 } else
2567 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 2568
ac27a0ec 2569 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2570 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2571 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 2572 goto cantfind_ext4;
0b8e58a1 2573
617ba13b 2574 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2575 if (sbi->s_inodes_per_block == 0)
617ba13b 2576 goto cantfind_ext4;
ac27a0ec
DK		 2577 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2578 sbi->s_inodes_per_block;
0d1ee42f 2579 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2580 sbi->s_sbh = bh;
2581 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2582 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2583 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 2584
2b2d6d01 2585 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2586 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2587 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2588 i = le32_to_cpu(es->s_flags);
2589 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2590 sbi->s_hash_unsigned = 3;
2591 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2592#ifdef __CHAR_UNSIGNED__
2593 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2594 sbi->s_hash_unsigned = 3;
2595#else
2596 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2597#endif
2598 sb->s_dirt = 1;
2599 }
ac27a0ec
DK		 2600
2601 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 2602 ext4_msg(sb, KERN_ERR,
2603 "#blocks per group too big: %lu",
2b2d6d01 2604 sbi->s_blocks_per_group);
ac27a0ec
DK		 2605 goto failed_mount;
2606 }
ac27a0ec 2607 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 2608 ext4_msg(sb, KERN_ERR,
2609 "#inodes per group too big: %lu",
2b2d6d01 2610 sbi->s_inodes_per_group);
ac27a0ec
DK		 2611 goto failed_mount;
2612 }
2613
bf43d84b
ES		 2614 /*
2615 * Test whether we have more sectors than will fit in sector_t,
2616 * and whether the max offset is addressable by the page cache.
2617 */
2618 if ((ext4_blocks_count(es) >
2619 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2620 (ext4_blocks_count(es) >
2621 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
b31e1552 2622 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 2623 " too large to mount safely on this system");
ac27a0ec 2624 if (sizeof(sector_t) < 8)
90c699a9 2625 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
bf43d84b 2626 ret = -EFBIG;
ac27a0ec
DK		 2627 goto failed_mount;
2628 }
2629
617ba13b
MC		 2630 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2631 goto cantfind_ext4;
e7c95593 2632
0f2ddca6
FTN		 2633 /* check blocks count against device size */
2634 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2635 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 2636 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2637 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 2638 ext4_blocks_count(es), blocks_count);
2639 goto failed_mount;
2640 }
2641
0b8e58a1
AD		 2642 /*
2643 * It makes no sense for the first data block to be beyond the end
2644 * of the filesystem.
2645 */
2646 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 2647 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2648 "block %u is beyond end of filesystem (%llu)",
2649 le32_to_cpu(es->s_first_data_block),
2650 ext4_blocks_count(es));
e7c95593
ES		 2651 goto failed_mount;
2652 }
bd81d8ee
LV		 2653 blocks_count = (ext4_blocks_count(es) -
2654 le32_to_cpu(es->s_first_data_block) +
2655 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2656 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 2657 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 2658 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 2659 "(block count %llu, first data block %u, "
b31e1552 2660 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 2661 ext4_blocks_count(es),
2662 le32_to_cpu(es->s_first_data_block),
2663 EXT4_BLOCKS_PER_GROUP(sb));
2664 goto failed_mount;
2665 }
bd81d8ee 2666 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 2667 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2668 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 2669 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2670 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2671 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2672 GFP_KERNEL);
2673 if (sbi->s_group_desc == NULL) {
b31e1552 2674 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 2675 goto failed_mount;
2676 }
2677
3244fcb1 2678#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2679 if (ext4_proc_root)
2680 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2681#endif
240799cd 2682
705895b6 2683 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2684
2685 for (i = 0; i < db_count; i++) {
70bbb3e0 2686 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2687 sbi->s_group_desc[i] = sb_bread(sb, block);
2688 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 2689 ext4_msg(sb, KERN_ERR,
2690 "can't read group descriptor %d", i);
ac27a0ec
DK		 2691 db_count = i;
2692 goto failed_mount2;
2693 }
2694 }
2b2d6d01 2695 if (!ext4_check_descriptors(sb)) {
b31e1552 2696 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 2697 goto failed_mount2;
2698 }
772cb7c8
JS		 2699 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2700 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 2701 ext4_msg(sb, KERN_ERR,
2702 "unable to initialize "
2703 "flex_bg meta info!");
772cb7c8
JS		 2704 goto failed_mount2;
2705 }
2706
ac27a0ec
DK		 2707 sbi->s_gdb_count = db_count;
2708 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2709 spin_lock_init(&sbi->s_next_gen_lock);
2710
833f4077
PZ		 2711 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2712 ext4_count_free_blocks(sb));
2713 if (!err) {
2714 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2715 ext4_count_free_inodes(sb));
2716 }
2717 if (!err) {
2718 err = percpu_counter_init(&sbi->s_dirs_counter,
2719 ext4_count_dirs(sb));
2720 }
6bc6e63f
AK		 2721 if (!err) {
2722 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2723 }
833f4077 2724 if (err) {
b31e1552 2725 ext4_msg(sb, KERN_ERR, "insufficient memory");
833f4077
PZ		 2726 goto failed_mount3;
2727 }
ac27a0ec 2728
c9de560d 2729 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 2730 sbi->s_max_writeback_mb_bump = 128;
c9de560d 2731
ac27a0ec
DK		 2732 /*
2733 * set up enough so that it can read an inode
2734 */
9ca92389
TT		 2735 if (!test_opt(sb, NOLOAD) &&
2736 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2737 sb->s_op = &ext4_sops;
2738 else
2739 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2740 sb->s_export_op = &ext4_export_ops;
2741 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2742#ifdef CONFIG_QUOTA
617ba13b
MC		 2743 sb->s_qcop = &ext4_qctl_operations;
2744 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2745#endif
2746 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2747 mutex_init(&sbi->s_orphan_lock);
32ed5058 2748 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2749
2750 sb->s_root = NULL;
2751
2752 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2753 EXT4_HAS_INCOMPAT_FEATURE(sb,
2754 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2755
2756 /*
2757 * The first inode we look at is the journal inode. Don't try
2758 * root first: it may be modified in the journal!
2759 */
2760 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2761 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2762 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2763 goto failed_mount3;
0390131b
FM		 2764 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2765 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 2766 ext4_msg(sb, KERN_ERR, "required journal recovery "
2767 "suppressed and not mounted read-only");
0390131b 2768 goto failed_mount4;
ac27a0ec 2769 } else {
0390131b
FM		 2770 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2771 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2772 sbi->s_journal = NULL;
2773 needs_recovery = 0;
2774 goto no_journal;
ac27a0ec
DK		 2775 }
2776
eb40a09c
JS		 2777 if (ext4_blocks_count(es) > 0xffffffffULL &&
2778 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2779 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 2780 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
eb40a09c
JS		 2781 goto failed_mount4;
2782 }
2783
d4da6c9c
LT		 2784 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2785 jbd2_journal_set_features(sbi->s_journal,
2786 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 2787 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2788 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2789 jbd2_journal_set_features(sbi->s_journal,
2790 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 2791 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2792 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2793 } else {
2794 jbd2_journal_clear_features(sbi->s_journal,
2795 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2796 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2797 }
818d276c 2798
ac27a0ec
DK		 2799 /* We have now updated the journal if required, so we can
2800 * validate the data journaling mode. */
2801 switch (test_opt(sb, DATA_FLAGS)) {
2802 case 0:
2803 /* No mode set, assume a default based on the journal
63f57933
AM		 2804 * capabilities: ORDERED_DATA if the journal can
2805 * cope, else JOURNAL_DATA
2806 */
dab291af
MC		 2807 if (jbd2_journal_check_available_features
2808 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2809 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2810 else
2811 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2812 break;
2813
617ba13b
MC		 2814 case EXT4_MOUNT_ORDERED_DATA:
2815 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2816 if (!jbd2_journal_check_available_features
2817 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 2818 ext4_msg(sb, KERN_ERR, "Journal does not support "
2819 "requested data journaling mode");
ac27a0ec
DK		 2820 goto failed_mount4;
2821 }
2822 default:
2823 break;
2824 }
b3881f74 2825 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2826
0390131b 2827no_journal:
ac27a0ec
DK		 2828
2829 if (test_opt(sb, NOBH)) {
617ba13b 2830 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
b31e1552
ES		 2831 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2832 "its supported only with writeback mode");
ac27a0ec
DK		 2833 clear_opt(sbi->s_mount_opt, NOBH);
2834 }
2835 }
4c0425ff
MC		 2836 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2837 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2838 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2839 goto failed_mount_wq;
2840 }
2841
ac27a0ec 2842 /*
dab291af 2843 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2844 * so we can safely mount the rest of the filesystem now.
2845 */
2846
1d1fe1ee
DH		 2847 root = ext4_iget(sb, EXT4_ROOT_INO);
2848 if (IS_ERR(root)) {
b31e1552 2849 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 2850 ret = PTR_ERR(root);
ac27a0ec
DK		 2851 goto failed_mount4;
2852 }
2853 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2854 iput(root);
b31e1552 2855 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 2856 goto failed_mount4;
2857 }
1d1fe1ee
DH		 2858 sb->s_root = d_alloc_root(root);
2859 if (!sb->s_root) {
b31e1552 2860 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 2861 iput(root);
2862 ret = -ENOMEM;
2863 goto failed_mount4;
2864 }
ac27a0ec 2865
2b2d6d01 2866 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2867
2868 /* determine the minimum size of new large inodes, if present */
2869 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2870 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2871 EXT4_GOOD_OLD_INODE_SIZE;
2872 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2873 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2874 if (sbi->s_want_extra_isize <
2875 le16_to_cpu(es->s_want_extra_isize))
2876 sbi->s_want_extra_isize =
2877 le16_to_cpu(es->s_want_extra_isize);
2878 if (sbi->s_want_extra_isize <
2879 le16_to_cpu(es->s_min_extra_isize))
2880 sbi->s_want_extra_isize =
2881 le16_to_cpu(es->s_min_extra_isize);
2882 }
2883 }
2884 /* Check if enough inode space is available */
2885 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2886 sbi->s_inode_size) {
2887 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2888 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 2889 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2890 "available");
ef7f3835
KS		 2891 }
2892
90576c0b
TT		 2893 if (test_opt(sb, DELALLOC) &&
2894 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 2895 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2896 "requested data journaling mode");
c2774d84 2897 clear_opt(sbi->s_mount_opt, DELALLOC);
90576c0b 2898 }
c2774d84 2899
6fd058f7
TT		 2900 err = ext4_setup_system_zone(sb);
2901 if (err) {
b31e1552
ES		 2902 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2903 "zone (%d)\n", err);
6fd058f7
TT		 2904 goto failed_mount4;
2905 }
2906
c2774d84
AK		 2907 ext4_ext_init(sb);
2908 err = ext4_mb_init(sb, needs_recovery);
2909 if (err) {
b31e1552
ES		 2910 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2911 err);
c2774d84
AK		 2912 goto failed_mount4;
2913 }
2914
3197ebdb
TT		 2915 sbi->s_kobj.kset = ext4_kset;
2916 init_completion(&sbi->s_kobj_unregister);
2917 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2918 "%s", sb->s_id);
2919 if (err) {
2920 ext4_mb_release(sb);
2921 ext4_ext_release(sb);
2922 goto failed_mount4;
2923 };
2924
617ba13b
MC		 2925 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2926 ext4_orphan_cleanup(sb, es);
2927 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2928 if (needs_recovery) {
b31e1552 2929 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 2930 ext4_mark_recovery_complete(sb, es);
2931 }
2932 if (EXT4_SB(sb)->s_journal) {
2933 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2934 descr = " journalled data mode";
2935 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2936 descr = " ordered data mode";
2937 else
2938 descr = " writeback data mode";
2939 } else
2940 descr = "out journal";
2941
b31e1552 2942 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
ac27a0ec
DK		 2943
2944 lock_kernel();
2945 return 0;
2946
617ba13b 2947cantfind_ext4:
ac27a0ec 2948 if (!silent)
b31e1552 2949 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 2950 goto failed_mount;
2951
2952failed_mount4:
b31e1552 2953 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 2954 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2955failed_mount_wq:
6fd058f7 2956 ext4_release_system_zone(sb);
0390131b
FM		 2957 if (sbi->s_journal) {
2958 jbd2_journal_destroy(sbi->s_journal);
2959 sbi->s_journal = NULL;
2960 }
ac27a0ec 2961failed_mount3:
c5ca7c76
TT		 2962 if (sbi->s_flex_groups) {
2963 if (is_vmalloc_addr(sbi->s_flex_groups))
2964 vfree(sbi->s_flex_groups);
2965 else
2966 kfree(sbi->s_flex_groups);
2967 }
ac27a0ec
DK		 2968 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2969 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2970 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2971 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2972failed_mount2:
2973 for (i = 0; i < db_count; i++)
2974 brelse(sbi->s_group_desc[i]);
2975 kfree(sbi->s_group_desc);
2976failed_mount:
240799cd 2977 if (sbi->s_proc) {
9f6200bb 2978 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2979 }
ac27a0ec
DK		 2980#ifdef CONFIG_QUOTA
2981 for (i = 0; i < MAXQUOTAS; i++)
2982 kfree(sbi->s_qf_names[i]);
2983#endif
617ba13b 2984 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2985 brelse(bh);
2986out_fail:
2987 sb->s_fs_info = NULL;
f6830165 2988 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2989 kfree(sbi);
2990 lock_kernel();
1d1fe1ee 2991 return ret;
ac27a0ec
DK		 2992}
2993
2994/*
2995 * Setup any per-fs journal parameters now. We'll do this both on
2996 * initial mount, once the journal has been initialised but before we've
2997 * done any recovery; and again on any subsequent remount.
2998 */
617ba13b 2999static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3000{
617ba13b 3001 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3002
30773840
TT		 3003 journal->j_commit_interval = sbi->s_commit_interval;
3004 journal->j_min_batch_time = sbi->s_min_batch_time;
3005 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3006
3007 spin_lock(&journal->j_state_lock);
3008 if (test_opt(sb, BARRIER))
dab291af 3009 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3010 else
dab291af 3011 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3012 if (test_opt(sb, DATA_ERR_ABORT))
3013 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3014 else
3015 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 3016 spin_unlock(&journal->j_state_lock);
3017}
3018
617ba13b 3019static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3020 unsigned int journal_inum)
3021{
3022 struct inode *journal_inode;
3023 journal_t *journal;
3024
0390131b
FM		 3025 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3026
ac27a0ec
DK		 3027 /* First, test for the existence of a valid inode on disk. Bad
3028 * things happen if we iget() an unused inode, as the subsequent
3029 * iput() will try to delete it. */
3030
1d1fe1ee
DH		 3031 journal_inode = ext4_iget(sb, journal_inum);
3032 if (IS_ERR(journal_inode)) {
b31e1552 3033 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3034 return NULL;
3035 }
3036 if (!journal_inode->i_nlink) {
3037 make_bad_inode(journal_inode);
3038 iput(journal_inode);
b31e1552 3039 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3040 return NULL;
3041 }
3042
e5f8eab8 3043 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3044 journal_inode, journal_inode->i_size);
1d1fe1ee 3045 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3046 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3047 iput(journal_inode);
3048 return NULL;
3049 }
3050
dab291af 3051 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3052 if (!journal) {
b31e1552 3053 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3054 iput(journal_inode);
3055 return NULL;
3056 }
3057 journal->j_private = sb;
617ba13b 3058 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3059 return journal;
3060}
3061
617ba13b 3062static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3063 dev_t j_dev)
3064{
2b2d6d01 3065 struct buffer_head *bh;
ac27a0ec 3066 journal_t *journal;
617ba13b
MC		 3067 ext4_fsblk_t start;
3068 ext4_fsblk_t len;
ac27a0ec 3069 int hblock, blocksize;
617ba13b 3070 ext4_fsblk_t sb_block;
ac27a0ec 3071 unsigned long offset;
2b2d6d01 3072 struct ext4_super_block *es;
ac27a0ec
DK		 3073 struct block_device *bdev;
3074
0390131b
FM		 3075 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3076
b31e1552 3077 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3078 if (bdev == NULL)
3079 return NULL;
3080
3081 if (bd_claim(bdev, sb)) {
b31e1552
ES		 3082 ext4_msg(sb, KERN_ERR,
3083 "failed to claim external journal device");
9a1c3542 3084 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3085 return NULL;
3086 }
3087
3088 blocksize = sb->s_blocksize;
e1defc4f 3089 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3090 if (blocksize < hblock) {
b31e1552
ES		 3091 ext4_msg(sb, KERN_ERR,
3092 "blocksize too small for journal device");
ac27a0ec
DK		 3093 goto out_bdev;
3094 }
3095
617ba13b
MC		 3096 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3097 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3098 set_blocksize(bdev, blocksize);
3099 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3100 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3101 "external journal");
ac27a0ec
DK		 3102 goto out_bdev;
3103 }
3104
617ba13b
MC		 3105 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3106 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3107 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3108 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3109 ext4_msg(sb, KERN_ERR, "external journal has "
3110 "bad superblock");
ac27a0ec
DK		 3111 brelse(bh);
3112 goto out_bdev;
3113 }
3114
617ba13b 3115 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3116 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3117 brelse(bh);
3118 goto out_bdev;
3119 }
3120
bd81d8ee 3121 len = ext4_blocks_count(es);
ac27a0ec
DK		 3122 start = sb_block + 1;
3123 brelse(bh); /* we're done with the superblock */
3124
dab291af 3125 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3126 start, len, blocksize);
3127 if (!journal) {
b31e1552 3128 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3129 goto out_bdev;
3130 }
3131 journal->j_private = sb;
3132 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3133 wait_on_buffer(journal->j_sb_buffer);
3134 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3135 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3136 goto out_journal;
3137 }
3138 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3139 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3140 "user (unsupported) - %d",
ac27a0ec
DK		 3141 be32_to_cpu(journal->j_superblock->s_nr_users));
3142 goto out_journal;
3143 }
617ba13b
MC		 3144 EXT4_SB(sb)->journal_bdev = bdev;
3145 ext4_init_journal_params(sb, journal);
ac27a0ec 3146 return journal;
0b8e58a1 3147
ac27a0ec 3148out_journal:
dab291af 3149 jbd2_journal_destroy(journal);
ac27a0ec 3150out_bdev:
617ba13b 3151 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3152 return NULL;
3153}
3154
617ba13b
MC		 3155static int ext4_load_journal(struct super_block *sb,
3156 struct ext4_super_block *es,
ac27a0ec
DK		 3157 unsigned long journal_devnum)
3158{
3159 journal_t *journal;
3160 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3161 dev_t journal_dev;
3162 int err = 0;
3163 int really_read_only;
3164
0390131b
FM		 3165 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3166
ac27a0ec
DK		 3167 if (journal_devnum &&
3168 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3169 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3170 "numbers have changed");
ac27a0ec
DK		 3171 journal_dev = new_decode_dev(journal_devnum);
3172 } else
3173 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3174
3175 really_read_only = bdev_read_only(sb->s_bdev);
3176
3177 /*
3178 * Are we loading a blank journal or performing recovery after a
3179 * crash? For recovery, we need to check in advance whether we
3180 * can get read-write access to the device.
3181 */
617ba13b 3182 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3183 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3184 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3185 "required on readonly filesystem");
ac27a0ec 3186 if (really_read_only) {
b31e1552
ES		 3187 ext4_msg(sb, KERN_ERR, "write access "
3188 "unavailable, cannot proceed");
ac27a0ec
DK		 3189 return -EROFS;
3190 }
b31e1552
ES		 3191 ext4_msg(sb, KERN_INFO, "write access will "
3192 "be enabled during recovery");
ac27a0ec
DK		 3193 }
3194 }
3195
3196 if (journal_inum && journal_dev) {
b31e1552
ES		 3197 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3198 "and inode journals!");
ac27a0ec
DK		 3199 return -EINVAL;
3200 }
3201
3202 if (journal_inum) {
617ba13b 3203 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3204 return -EINVAL;
3205 } else {
617ba13b 3206 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3207 return -EINVAL;
3208 }
3209
90576c0b 3210 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3211 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3212
ac27a0ec 3213 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3214 err = jbd2_journal_update_format(journal);
ac27a0ec 3215 if (err) {
b31e1552 3216 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3217 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3218 return err;
3219 }
3220 }
3221
617ba13b 3222 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3223 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3224 if (!err)
dab291af 3225 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3226
3227 if (err) {
b31e1552 3228 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3229 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3230 return err;
3231 }
3232
617ba13b
MC		 3233 EXT4_SB(sb)->s_journal = journal;
3234 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3235
3236 if (journal_devnum &&
3237 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3238 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3239
3240 /* Make sure we flush the recovery flag to disk. */
e2d67052 3241 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3242 }
3243
3244 return 0;
3245}
3246
e2d67052 3247static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3248{
e2d67052 3249 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3250 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3251 int error = 0;
ac27a0ec
DK		 3252
3253 if (!sbh)
c4be0c1d 3254 return error;
914258bf
TT		 3255 if (buffer_write_io_error(sbh)) {
3256 /*
3257 * Oh, dear. A previous attempt to write the
3258 * superblock failed. This could happen because the
3259 * USB device was yanked out. Or it could happen to
3260 * be a transient write error and maybe the block will
3261 * be remapped. Nothing we can do but to retry the
3262 * write and hope for the best.
3263 */
b31e1552
ES		 3264 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3265 "superblock detected");
914258bf
TT		 3266 clear_buffer_write_io_error(sbh);
3267 set_buffer_uptodate(sbh);
3268 }
71290b36
TT		 3269 /*
3270 * If the file system is mounted read-only, don't update the
3271 * superblock write time. This avoids updating the superblock
3272 * write time when we are mounting the root file system
3273 * read/only but we need to replay the journal; at that point,
3274 * for people who are east of GMT and who make their clock
3275 * tick in localtime for Windows bug-for-bug compatibility,
3276 * the clock is set in the future, and this will cause e2fsck
3277 * to complain and force a full file system check.
3278 */
3279 if (!(sb->s_flags & MS_RDONLY))
3280 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3281 es->s_kbytes_written =
3282 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3283 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3284 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3285 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3286 &EXT4_SB(sb)->s_freeblocks_counter));
3287 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3288 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3289 sb->s_dirt = 0;
ac27a0ec
DK		 3290 BUFFER_TRACE(sbh, "marking dirty");
3291 mark_buffer_dirty(sbh);
914258bf 3292 if (sync) {
c4be0c1d
TS		 3293 error = sync_dirty_buffer(sbh);
3294 if (error)
3295 return error;
3296
3297 error = buffer_write_io_error(sbh);
3298 if (error) {
b31e1552
ES		 3299 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3300 "superblock");
914258bf
TT		 3301 clear_buffer_write_io_error(sbh);
3302 set_buffer_uptodate(sbh);
3303 }
3304 }
c4be0c1d 3305 return error;
ac27a0ec
DK		 3306}
3307
ac27a0ec
DK		 3308/*
3309 * Have we just finished recovery? If so, and if we are mounting (or
3310 * remounting) the filesystem readonly, then we will end up with a
3311 * consistent fs on disk. Record that fact.
3312 */
2b2d6d01
TT		 3313static void ext4_mark_recovery_complete(struct super_block *sb,
3314 struct ext4_super_block *es)
ac27a0ec 3315{
617ba13b 3316 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3317
0390131b
FM		 3318 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3319 BUG_ON(journal != NULL);
3320 return;
3321 }
dab291af 3322 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3323 if (jbd2_journal_flush(journal) < 0)
3324 goto out;
3325
617ba13b 3326 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3327 sb->s_flags & MS_RDONLY) {
617ba13b 3328 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3329 ext4_commit_super(sb, 1);
ac27a0ec 3330 }
7ffe1ea8
HK		 3331
3332out:
dab291af 3333 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3334}
3335
3336/*
3337 * If we are mounting (or read-write remounting) a filesystem whose journal
3338 * has recorded an error from a previous lifetime, move that error to the
3339 * main filesystem now.
3340 */
2b2d6d01
TT		 3341static void ext4_clear_journal_err(struct super_block *sb,
3342 struct ext4_super_block *es)
ac27a0ec
DK		 3343{
3344 journal_t *journal;
3345 int j_errno;
3346 const char *errstr;
3347
0390131b
FM		 3348 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3349
617ba13b 3350 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3351
3352 /*
3353 * Now check for any error status which may have been recorded in the
617ba13b 3354 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3355 */
3356
dab291af 3357 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3358 if (j_errno) {
3359 char nbuf[16];
3360
617ba13b 3361 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3362 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3363 "from previous mount: %s", errstr);
46e665e9 3364 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3365 "filesystem check.");
3366
617ba13b
MC		 3367 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3368 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3369 ext4_commit_super(sb, 1);
ac27a0ec 3370
dab291af 3371 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3372 }
3373}
3374
3375/*
3376 * Force the running and committing transactions to commit,
3377 * and wait on the commit.
3378 */
617ba13b 3379int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3380{
3381 journal_t *journal;
0390131b 3382 int ret = 0;
ac27a0ec
DK		 3383
3384 if (sb->s_flags & MS_RDONLY)
3385 return 0;
3386
617ba13b 3387 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3388 if (journal)
0390131b 3389 ret = ext4_journal_force_commit(journal);
0390131b 3390
ac27a0ec
DK		 3391 return ret;
3392}
3393
2b2d6d01 3394static void ext4_write_super(struct super_block *sb)
ac27a0ec 3395{
ebc1ac16 3396 lock_super(sb);
9ca92389 3397 ext4_commit_super(sb, 1);
ebc1ac16 3398 unlock_super(sb);
ac27a0ec
DK		 3399}
3400
617ba13b 3401static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3402{
14ce0cb4 3403 int ret = 0;
9eddacf9 3404 tid_t target;
8d5d02e6 3405 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3406
9bffad1e 3407 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 3408 flush_workqueue(sbi->dio_unwritten_wq);
3409 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 3410 if (wait)
8d5d02e6 3411 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 3412 }
14ce0cb4 3413 return ret;
ac27a0ec
DK		 3414}
3415
3416/*
3417 * LVM calls this function before a (read-only) snapshot is created. This
3418 * gives us a chance to flush the journal completely and mark the fs clean.
3419 */
c4be0c1d 3420static int ext4_freeze(struct super_block *sb)
ac27a0ec 3421{
c4be0c1d
TS		 3422 int error = 0;
3423 journal_t *journal;
ac27a0ec 3424
9ca92389
TT		 3425 if (sb->s_flags & MS_RDONLY)
3426 return 0;
ac27a0ec 3427
9ca92389 3428 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3429
9ca92389
TT		 3430 /* Now we set up the journal barrier. */
3431 jbd2_journal_lock_updates(journal);
ac27a0ec 3432
9ca92389
TT		 3433 /*
3434 * Don't clear the needs_recovery flag if we failed to flush
3435 * the journal.
3436 */
3437 error = jbd2_journal_flush(journal);
3438 if (error < 0) {
3439 out:
3440 jbd2_journal_unlock_updates(journal);
3441 return error;
ac27a0ec 3442 }
9ca92389
TT		 3443
3444 /* Journal blocked and flushed, clear needs_recovery flag. */
3445 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3446 error = ext4_commit_super(sb, 1);
3447 if (error)
3448 goto out;
c4be0c1d 3449 return 0;
ac27a0ec
DK		 3450}
3451
3452/*
3453 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3454 * flag here, even though the filesystem is not technically dirty yet.
3455 */
c4be0c1d 3456static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3457{
9ca92389
TT		 3458 if (sb->s_flags & MS_RDONLY)
3459 return 0;
3460
3461 lock_super(sb);
3462 /* Reset the needs_recovery flag before the fs is unlocked. */
3463 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3464 ext4_commit_super(sb, 1);
3465 unlock_super(sb);
3466 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3467 return 0;
ac27a0ec
DK		 3468}
3469
2b2d6d01 3470static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3471{
2b2d6d01 3472 struct ext4_super_block *es;
617ba13b
MC		 3473 struct ext4_sb_info *sbi = EXT4_SB(sb);
3474 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3475 unsigned long old_sb_flags;
617ba13b 3476 struct ext4_mount_options old_opts;
8a266467 3477 ext4_group_t g;
b3881f74 3478 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3479 int err;
3480#ifdef CONFIG_QUOTA
3481 int i;
3482#endif
3483
337eb00a
AIB		 3484 lock_kernel();
3485
ac27a0ec 3486 /* Store the original options */
bbd6851a 3487 lock_super(sb);
ac27a0ec
DK		 3488 old_sb_flags = sb->s_flags;
3489 old_opts.s_mount_opt = sbi->s_mount_opt;
3490 old_opts.s_resuid = sbi->s_resuid;
3491 old_opts.s_resgid = sbi->s_resgid;
3492 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3493 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3494 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3495#ifdef CONFIG_QUOTA
3496 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3497 for (i = 0; i < MAXQUOTAS; i++)
3498 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3499#endif
b3881f74
TT		 3500 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3501 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3502
3503 /*
3504 * Allow the "check" option to be passed as a remount option.
3505 */
b3881f74
TT		 3506 if (!parse_options(data, sb, NULL, &journal_ioprio,
3507 &n_blocks_count, 1)) {
ac27a0ec
DK		 3508 err = -EINVAL;
3509 goto restore_opts;
3510 }
3511
4ab2f15b 3512 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
46e665e9 3513 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3514
3515 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3516 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3517
3518 es = sbi->s_es;
3519
b3881f74 3520 if (sbi->s_journal) {
0390131b 3521 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3522 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3523 }
ac27a0ec
DK		 3524
3525 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3526 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 3527 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 3528 err = -EROFS;
3529 goto restore_opts;
3530 }
3531
3532 if (*flags & MS_RDONLY) {
3533 /*
3534 * First of all, the unconditional stuff we have to do
3535 * to disable replay of the journal when we next remount
3536 */
3537 sb->s_flags |= MS_RDONLY;
3538
3539 /*
3540 * OK, test if we are remounting a valid rw partition
3541 * readonly, and if so set the rdonly flag and then
3542 * mark the partition as valid again.
3543 */
617ba13b
MC		 3544 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3545 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3546 es->s_state = cpu_to_le16(sbi->s_mount_state);
3547
a63c9eb2 3548 if (sbi->s_journal)
0390131b 3549 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3550 } else {
a13fb1a4
ES		 3551 /* Make sure we can mount this feature set readwrite */
3552 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 3553 err = -EROFS;
3554 goto restore_opts;
3555 }
8a266467
TT		 3556 /*
3557 * Make sure the group descriptor checksums
0b8e58a1 3558 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 3559 */
3560 for (g = 0; g < sbi->s_groups_count; g++) {
3561 struct ext4_group_desc *gdp =
3562 ext4_get_group_desc(sb, g, NULL);
3563
3564 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 3565 ext4_msg(sb, KERN_ERR,
3566 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 3567 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3568 le16_to_cpu(gdp->bg_checksum));
3569 err = -EINVAL;
3570 goto restore_opts;
3571 }
3572 }
3573
ead6596b
ES		 3574 /*
3575 * If we have an unprocessed orphan list hanging
3576 * around from a previously readonly bdev mount,
3577 * require a full umount/remount for now.
3578 */
3579 if (es->s_last_orphan) {
b31e1552 3580 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 3581 "remount RDWR because of unprocessed "
3582 "orphan inode list. Please "
b31e1552 3583 "umount/remount instead");
ead6596b
ES		 3584 err = -EINVAL;
3585 goto restore_opts;
3586 }
3587
ac27a0ec
DK		 3588 /*
3589 * Mounting a RDONLY partition read-write, so reread
3590 * and store the current valid flag. (It may have
3591 * been changed by e2fsck since we originally mounted
3592 * the partition.)
3593 */
0390131b
FM		 3594 if (sbi->s_journal)
3595 ext4_clear_journal_err(sb, es);
ac27a0ec 3596 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3597 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3598 goto restore_opts;
2b2d6d01 3599 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3600 sb->s_flags &= ~MS_RDONLY;
3601 }
3602 }
6fd058f7 3603 ext4_setup_system_zone(sb);
0390131b 3604 if (sbi->s_journal == NULL)
e2d67052 3605 ext4_commit_super(sb, 1);
0390131b 3606
ac27a0ec
DK		 3607#ifdef CONFIG_QUOTA
3608 /* Release old quota file names */
3609 for (i = 0; i < MAXQUOTAS; i++)
3610 if (old_opts.s_qf_names[i] &&
3611 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3612 kfree(old_opts.s_qf_names[i]);
3613#endif
bbd6851a 3614 unlock_super(sb);
337eb00a 3615 unlock_kernel();
ac27a0ec 3616 return 0;
0b8e58a1 3617
ac27a0ec
DK		 3618restore_opts:
3619 sb->s_flags = old_sb_flags;
3620 sbi->s_mount_opt = old_opts.s_mount_opt;
3621 sbi->s_resuid = old_opts.s_resuid;
3622 sbi->s_resgid = old_opts.s_resgid;
3623 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3624 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3625 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3626#ifdef CONFIG_QUOTA
3627 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3628 for (i = 0; i < MAXQUOTAS; i++) {
3629 if (sbi->s_qf_names[i] &&
3630 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3631 kfree(sbi->s_qf_names[i]);
3632 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3633 }
3634#endif
bbd6851a 3635 unlock_super(sb);
337eb00a 3636 unlock_kernel();
ac27a0ec
DK		 3637 return err;
3638}
3639
2b2d6d01 3640static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3641{
3642 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3643 struct ext4_sb_info *sbi = EXT4_SB(sb);
3644 struct ext4_super_block *es = sbi->s_es;
960cc398 3645 u64 fsid;
ac27a0ec 3646
5e70030d
BP		 3647 if (test_opt(sb, MINIX_DF)) {
3648 sbi->s_overhead_last = 0;
6bc9feff 3649 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3650 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3651 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3652
3653 /*
5e70030d
BP		 3654 * Compute the overhead (FS structures). This is constant
3655 * for a given filesystem unless the number of block groups
3656 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3657 */
3658
3659 /*
3660 * All of the blocks before first_data_block are
3661 * overhead
3662 */
3663 overhead = le32_to_cpu(es->s_first_data_block);
3664
3665 /*
3666 * Add the overhead attributed to the superblock and
3667 * block group descriptors. If the sparse superblocks
3668 * feature is turned on, then not all groups have this.
3669 */
3670 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3671 overhead += ext4_bg_has_super(sb, i) +
3672 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3673 cond_resched();
3674 }
3675
3676 /*
3677 * Every block group has an inode bitmap, a block
3678 * bitmap, and an inode table.
3679 */
5e70030d
BP		 3680 overhead += ngroups * (2 + sbi->s_itb_per_group);
3681 sbi->s_overhead_last = overhead;
3682 smp_wmb();
6bc9feff 3683 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3684 }
3685
617ba13b 3686 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3687 buf->f_bsize = sb->s_blocksize;
5e70030d 3688 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3689 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3690 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
bd81d8ee
LV		 3691 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3692 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3693 buf->f_bavail = 0;
3694 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3695 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 3696 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3697 fsid = le64_to_cpup((void *)es->s_uuid) ^
3698 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3699 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3700 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 3701
ac27a0ec
DK		 3702 return 0;
3703}
3704
0b8e58a1
AD		 3705/* Helper function for writing quotas on sync - we need to start transaction
3706 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 3707 * Process 1 Process 2
617ba13b 3708 * ext4_create() quota_sync()
a269eb18
JK		 3709 * jbd2_journal_start() write_dquot()
3710 * vfs_dq_init() down(dqio_mutex)
dab291af 3711 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3712 *
3713 */
3714
3715#ifdef CONFIG_QUOTA
3716
3717static inline struct inode *dquot_to_inode(struct dquot *dquot)
3718{
3719 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3720}
3721
617ba13b 3722static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3723{
3724 int ret, err;
3725 handle_t *handle;
3726 struct inode *inode;
3727
3728 inode = dquot_to_inode(dquot);
617ba13b 3729 handle = ext4_journal_start(inode,
0b8e58a1 3730 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3731 if (IS_ERR(handle))
3732 return PTR_ERR(handle);
3733 ret = dquot_commit(dquot);
617ba13b 3734 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3735 if (!ret)
3736 ret = err;
3737 return ret;
3738}
3739
617ba13b 3740static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3741{
3742 int ret, err;
3743 handle_t *handle;
3744
617ba13b 3745 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3746 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3747 if (IS_ERR(handle))
3748 return PTR_ERR(handle);
3749 ret = dquot_acquire(dquot);
617ba13b 3750 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3751 if (!ret)
3752 ret = err;
3753 return ret;
3754}
3755
617ba13b 3756static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3757{
3758 int ret, err;
3759 handle_t *handle;
3760
617ba13b 3761 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3762 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3763 if (IS_ERR(handle)) {
3764 /* Release dquot anyway to avoid endless cycle in dqput() */
3765 dquot_release(dquot);
ac27a0ec 3766 return PTR_ERR(handle);
9c3013e9 3767 }
ac27a0ec 3768 ret = dquot_release(dquot);
617ba13b 3769 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3770 if (!ret)
3771 ret = err;
3772 return ret;
3773}
3774
617ba13b 3775static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3776{
2c8be6b2 3777 /* Are we journaling quotas? */
617ba13b
MC		 3778 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3779 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3780 dquot_mark_dquot_dirty(dquot);
617ba13b 3781 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3782 } else {
3783 return dquot_mark_dquot_dirty(dquot);
3784 }
3785}
3786
617ba13b 3787static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3788{
3789 int ret, err;
3790 handle_t *handle;
3791
3792 /* Data block + inode block */
617ba13b 3793 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3794 if (IS_ERR(handle))
3795 return PTR_ERR(handle);
3796 ret = dquot_commit_info(sb, type);
617ba13b 3797 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3798 if (!ret)
3799 ret = err;
3800 return ret;
3801}
3802
3803/*
3804 * Turn on quotas during mount time - we need to find
3805 * the quota file and such...
3806 */
617ba13b 3807static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3808{
617ba13b 3809 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
0b8e58a1 3810 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3811}
3812
3813/*
3814 * Standard function to be called on quota_on
3815 */
617ba13b 3816static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3817 char *name, int remount)
ac27a0ec
DK		 3818{
3819 int err;
8264613d 3820 struct path path;
ac27a0ec
DK		 3821
3822 if (!test_opt(sb, QUOTA))
3823 return -EINVAL;
8264613d 3824 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3825 if (remount)
8264613d 3826 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3827
8264613d 3828 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3829 if (err)
3830 return err;
0623543b 3831
ac27a0ec 3832 /* Quotafile not on the same filesystem? */
8264613d
AV		 3833 if (path.mnt->mnt_sb != sb) {
3834 path_put(&path);
ac27a0ec
DK		 3835 return -EXDEV;
3836 }
0623543b
JK		 3837 /* Journaling quota? */
3838 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3839 /* Quotafile not in fs root? */
8264613d 3840 if (path.dentry->d_parent != sb->s_root)
b31e1552
ES		 3841 ext4_msg(sb, KERN_WARNING,
3842 "Quota file not on filesystem root. "
3843 "Journaled quota will not work");
2b2d6d01 3844 }
0623543b
JK		 3845
3846 /*
3847 * When we journal data on quota file, we have to flush journal to see
3848 * all updates to the file when we bypass pagecache...
3849 */
0390131b
FM		 3850 if (EXT4_SB(sb)->s_journal &&
3851 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3852 /*
3853 * We don't need to lock updates but journal_flush() could
3854 * otherwise be livelocked...
3855 */
3856 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3857 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3858 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3859 if (err) {
8264613d 3860 path_put(&path);
7ffe1ea8
HK		 3861 return err;
3862 }
0623543b
JK		 3863 }
3864
8264613d
AV		 3865 err = vfs_quota_on_path(sb, type, format_id, &path);
3866 path_put(&path);
77e69dac 3867 return err;
ac27a0ec
DK		 3868}
3869
3870/* Read data from quotafile - avoid pagecache and such because we cannot afford
3871 * acquiring the locks... As quota files are never truncated and quota code
3872 * itself serializes the operations (and noone else should touch the files)
3873 * we don't have to be afraid of races */
617ba13b 3874static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3875 size_t len, loff_t off)
3876{
3877 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3878 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3879 int err = 0;
3880 int offset = off & (sb->s_blocksize - 1);
3881 int tocopy;
3882 size_t toread;
3883 struct buffer_head *bh;
3884 loff_t i_size = i_size_read(inode);
3885
3886 if (off > i_size)
3887 return 0;
3888 if (off+len > i_size)
3889 len = i_size-off;
3890 toread = len;
3891 while (toread > 0) {
3892 tocopy = sb->s_blocksize - offset < toread ?
3893 sb->s_blocksize - offset : toread;
617ba13b 3894 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3895 if (err)
3896 return err;
3897 if (!bh) /* A hole? */
3898 memset(data, 0, tocopy);
3899 else
3900 memcpy(data, bh->b_data+offset, tocopy);
3901 brelse(bh);
3902 offset = 0;
3903 toread -= tocopy;
3904 data += tocopy;
3905 blk++;
3906 }
3907 return len;
3908}
3909
3910/* Write to quotafile (we know the transaction is already started and has
3911 * enough credits) */
617ba13b 3912static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3913 const char *data, size_t len, loff_t off)
3914{
3915 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3916 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3917 int err = 0;
3918 int offset = off & (sb->s_blocksize - 1);
3919 int tocopy;
617ba13b 3920 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3921 size_t towrite = len;
3922 struct buffer_head *bh;
3923 handle_t *handle = journal_current_handle();
3924
0390131b 3925 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 3926 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3927 " cancelled because transaction is not started",
9c3013e9
JK		 3928 (unsigned long long)off, (unsigned long long)len);
3929 return -EIO;
3930 }
ac27a0ec
DK		 3931 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3932 while (towrite > 0) {
3933 tocopy = sb->s_blocksize - offset < towrite ?
3934 sb->s_blocksize - offset : towrite;
617ba13b 3935 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3936 if (!bh)
3937 goto out;
3938 if (journal_quota) {
617ba13b 3939 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3940 if (err) {
3941 brelse(bh);
3942 goto out;
3943 }
3944 }
3945 lock_buffer(bh);
3946 memcpy(bh->b_data+offset, data, tocopy);
3947 flush_dcache_page(bh->b_page);
3948 unlock_buffer(bh);
3949 if (journal_quota)
0390131b 3950 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3951 else {
3952 /* Always do at least ordered writes for quotas */
678aaf48 3953 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3954 mark_buffer_dirty(bh);
3955 }
3956 brelse(bh);
3957 if (err)
3958 goto out;
3959 offset = 0;
3960 towrite -= tocopy;
3961 data += tocopy;
3962 blk++;
3963 }
3964out:
4d04e4fb
JK		 3965 if (len == towrite) {
3966 mutex_unlock(&inode->i_mutex);
ac27a0ec 3967 return err;
4d04e4fb 3968 }
ac27a0ec
DK		 3969 if (inode->i_size < off+len-towrite) {
3970 i_size_write(inode, off+len-towrite);
617ba13b 3971 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3972 }
ac27a0ec 3973 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3974 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3975 mutex_unlock(&inode->i_mutex);
3976 return len - towrite;
3977}
3978
3979#endif
3980
0b8e58a1
AD		 3981static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3982 const char *dev_name, void *data, struct vfsmount *mnt)
ac27a0ec 3983{
0b8e58a1 3984 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
ac27a0ec
DK		 3985}
3986
a214238d 3987#if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 3988static struct file_system_type ext2_fs_type = {
3989 .owner = THIS_MODULE,
3990 .name = "ext2",
3991 .get_sb = ext4_get_sb,
3992 .kill_sb = kill_block_super,
3993 .fs_flags = FS_REQUIRES_DEV,
3994};
3995
3996static inline void register_as_ext2(void)
3997{
3998 int err = register_filesystem(&ext2_fs_type);
3999 if (err)
4000 printk(KERN_WARNING
4001 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4002}
4003
4004static inline void unregister_as_ext2(void)
4005{
4006 unregister_filesystem(&ext2_fs_type);
4007}
51b7e3c9 4008MODULE_ALIAS("ext2");
24b58424
TT		 4009#else
4010static inline void register_as_ext2(void) { }
4011static inline void unregister_as_ext2(void) { }
4012#endif
4013
a214238d 4014#if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4015static struct file_system_type ext3_fs_type = {
4016 .owner = THIS_MODULE,
4017 .name = "ext3",
4018 .get_sb = ext4_get_sb,
4019 .kill_sb = kill_block_super,
4020 .fs_flags = FS_REQUIRES_DEV,
4021};
4022
4023static inline void register_as_ext3(void)
4024{
4025 int err = register_filesystem(&ext3_fs_type);
4026 if (err)
4027 printk(KERN_WARNING
4028 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4029}
4030
4031static inline void unregister_as_ext3(void)
4032{
4033 unregister_filesystem(&ext3_fs_type);
4034}
51b7e3c9 4035MODULE_ALIAS("ext3");
24b58424
TT		 4036#else
4037static inline void register_as_ext3(void) { }
4038static inline void unregister_as_ext3(void) { }
4039#endif
4040
03010a33
TT		 4041static struct file_system_type ext4_fs_type = {
4042 .owner = THIS_MODULE,
4043 .name = "ext4",
4044 .get_sb = ext4_get_sb,
4045 .kill_sb = kill_block_super,
4046 .fs_flags = FS_REQUIRES_DEV,
4047};
4048
617ba13b 4049static int __init init_ext4_fs(void)
ac27a0ec 4050{
c9de560d
AT		 4051 int err;
4052
6fd058f7
TT		 4053 err = init_ext4_system_zone();
4054 if (err)
4055 return err;
3197ebdb
TT		 4056 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4057 if (!ext4_kset)
6fd058f7 4058 goto out4;
9f6200bb 4059 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 4060 err = init_ext4_mballoc();
ac27a0ec 4061 if (err)
6fd058f7 4062 goto out3;
c9de560d
AT		 4063
4064 err = init_ext4_xattr();
4065 if (err)
4066 goto out2;
ac27a0ec
DK		 4067 err = init_inodecache();
4068 if (err)
4069 goto out1;
24b58424
TT		 4070 register_as_ext2();
4071 register_as_ext3();
03010a33 4072 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4073 if (err)
4074 goto out;
4075 return 0;
4076out:
24b58424
TT		 4077 unregister_as_ext2();
4078 unregister_as_ext3();
ac27a0ec
DK		 4079 destroy_inodecache();
4080out1:
617ba13b 4081 exit_ext4_xattr();
c9de560d
AT		 4082out2:
4083 exit_ext4_mballoc();
6fd058f7
TT		 4084out3:
4085 remove_proc_entry("fs/ext4", NULL);
4086 kset_unregister(ext4_kset);
4087out4:
4088 exit_ext4_system_zone();
ac27a0ec
DK		 4089 return err;
4090}
4091
617ba13b 4092static void __exit exit_ext4_fs(void)
ac27a0ec 4093{
24b58424
TT		 4094 unregister_as_ext2();
4095 unregister_as_ext3();
03010a33 4096 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4097 destroy_inodecache();
617ba13b 4098 exit_ext4_xattr();
c9de560d 4099 exit_ext4_mballoc();
9f6200bb 4100 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4101 kset_unregister(ext4_kset);
6fd058f7 4102 exit_ext4_system_zone();
ac27a0ec
DK		 4103}
4104
4105MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4106MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4107MODULE_LICENSE("GPL");
617ba13b
MC		 4108module_init(init_ext4_fs)
4109module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)