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ext4: correct comments for ext4_free_blocks()
[thirdparty/kernel/linux.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
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>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451
CH		 47#include "ext4.h"
48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
1f109d5a 56static struct proc_dir_entry *ext4_proc_root;
3197ebdb 57static struct kset *ext4_kset;
0b75a840
LC		 58static struct ext4_lazy_init *ext4_li_info;
59static struct mutex ext4_li_mtx;
60static struct ext4_features *ext4_feat;
9f6200bb 61
617ba13b 62static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 63 unsigned long journal_devnum);
e2d67052 64static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 65static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
617ba13b 69static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 70static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 71 char nbuf[16]);
2b2d6d01
TT		 72static int ext4_remount(struct super_block *sb, int *flags, char *data);
73static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 74static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 75static void ext4_write_super(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
ac27a0ec 85
2035e776
TT		 86#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93};
94#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
95#else
96#define IS_EXT2_SB(sb) (0)
97#endif
98
99
ba69f9ab
JK		 100#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
101static struct file_system_type ext3_fs_type = {
102 .owner = THIS_MODULE,
103 .name = "ext3",
152a0836 104 .mount = ext4_mount,
ba69f9ab
JK		 105 .kill_sb = kill_block_super,
106 .fs_flags = FS_REQUIRES_DEV,
107};
108#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
109#else
110#define IS_EXT3_SB(sb) (0)
111#endif
bd81d8ee 112
8fadc143
AR		 113ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
114 struct ext4_group_desc *bg)
bd81d8ee 115{
3a14589c 116 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 117 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 118 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 119}
120
8fadc143
AR		 121ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
122 struct ext4_group_desc *bg)
bd81d8ee 123{
5272f837 124 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 125 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 126 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 127}
128
8fadc143
AR		 129ext4_fsblk_t ext4_inode_table(struct super_block *sb,
130 struct ext4_group_desc *bg)
bd81d8ee 131{
5272f837 132 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 133 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 134 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 135}
136
560671a0
AK		 137__u32 ext4_free_blks_count(struct super_block *sb,
138 struct ext4_group_desc *bg)
139{
140 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
141 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 142 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 143}
144
145__u32 ext4_free_inodes_count(struct super_block *sb,
146 struct ext4_group_desc *bg)
147{
148 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
149 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 150 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 151}
152
153__u32 ext4_used_dirs_count(struct super_block *sb,
154 struct ext4_group_desc *bg)
155{
156 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
157 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 158 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 159}
160
161__u32 ext4_itable_unused_count(struct super_block *sb,
162 struct ext4_group_desc *bg)
163{
164 return le16_to_cpu(bg->bg_itable_unused_lo) |
165 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 166 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 167}
168
8fadc143
AR		 169void ext4_block_bitmap_set(struct super_block *sb,
170 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 171{
3a14589c 172 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 173 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
174 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 175}
176
8fadc143
AR		 177void ext4_inode_bitmap_set(struct super_block *sb,
178 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 179{
5272f837 180 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 181 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
182 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 183}
184
8fadc143
AR		 185void ext4_inode_table_set(struct super_block *sb,
186 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 187{
5272f837 188 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 189 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
190 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 191}
192
560671a0
AK		 193void ext4_free_blks_set(struct super_block *sb,
194 struct ext4_group_desc *bg, __u32 count)
195{
196 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
197 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
198 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
199}
200
201void ext4_free_inodes_set(struct super_block *sb,
202 struct ext4_group_desc *bg, __u32 count)
203{
204 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
205 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
206 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
207}
208
209void ext4_used_dirs_set(struct super_block *sb,
210 struct ext4_group_desc *bg, __u32 count)
211{
212 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
213 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
214 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
215}
216
217void ext4_itable_unused_set(struct super_block *sb,
218 struct ext4_group_desc *bg, __u32 count)
219{
220 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
221 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
222 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
223}
224
d3d1faf6
CW		 225
226/* Just increment the non-pointer handle value */
227static handle_t *ext4_get_nojournal(void)
228{
229 handle_t *handle = current->journal_info;
230 unsigned long ref_cnt = (unsigned long)handle;
231
232 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
233
234 ref_cnt++;
235 handle = (handle_t *)ref_cnt;
236
237 current->journal_info = handle;
238 return handle;
239}
240
241
242/* Decrement the non-pointer handle value */
243static void ext4_put_nojournal(handle_t *handle)
244{
245 unsigned long ref_cnt = (unsigned long)handle;
246
247 BUG_ON(ref_cnt == 0);
248
249 ref_cnt--;
250 handle = (handle_t *)ref_cnt;
251
252 current->journal_info = handle;
253}
254
ac27a0ec 255/*
dab291af 256 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 257 *
258 * The only special thing we need to do here is to make sure that all
259 * journal_end calls result in the superblock being marked dirty, so
260 * that sync() will call the filesystem's write_super callback if
261 * appropriate.
be4f27d3
YY		 262 *
263 * To avoid j_barrier hold in userspace when a user calls freeze(),
264 * ext4 prevents a new handle from being started by s_frozen, which
265 * is in an upper layer.
ac27a0ec 266 */
617ba13b 267handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 268{
269 journal_t *journal;
be4f27d3 270 handle_t *handle;
ac27a0ec
DK		 271
272 if (sb->s_flags & MS_RDONLY)
273 return ERR_PTR(-EROFS);
274
617ba13b 275 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 276 handle = ext4_journal_current_handle();
277
278 /*
279 * If a handle has been started, it should be allowed to
280 * finish, otherwise deadlock could happen between freeze
281 * and others(e.g. truncate) due to the restart of the
282 * journal handle if the filesystem is forzen and active
283 * handles are not stopped.
284 */
285 if (!handle)
286 vfs_check_frozen(sb, SB_FREEZE_TRANS);
287
288 if (!journal)
289 return ext4_get_nojournal();
290 /*
291 * Special case here: if the journal has aborted behind our
292 * backs (eg. EIO in the commit thread), then we still need to
293 * take the FS itself readonly cleanly.
294 */
295 if (is_journal_aborted(journal)) {
296 ext4_abort(sb, "Detected aborted journal");
297 return ERR_PTR(-EROFS);
ac27a0ec 298 }
be4f27d3 299 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 300}
301
302/*
303 * The only special thing we need to do here is to make sure that all
dab291af 304 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 305 * that sync() will call the filesystem's write_super callback if
306 * appropriate.
307 */
c398eda0 308int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 309{
310 struct super_block *sb;
311 int err;
312 int rc;
313
0390131b 314 if (!ext4_handle_valid(handle)) {
d3d1faf6 315 ext4_put_nojournal(handle);
0390131b
FM		 316 return 0;
317 }
ac27a0ec
DK		 318 sb = handle->h_transaction->t_journal->j_private;
319 err = handle->h_err;
dab291af 320 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 321
322 if (!err)
323 err = rc;
324 if (err)
c398eda0 325 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 326 return err;
327}
328
90c7201b
TT		 329void ext4_journal_abort_handle(const char *caller, unsigned int line,
330 const char *err_fn, struct buffer_head *bh,
331 handle_t *handle, int err)
ac27a0ec
DK		 332{
333 char nbuf[16];
617ba13b 334 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 335
0390131b
FM		 336 BUG_ON(!ext4_handle_valid(handle));
337
ac27a0ec
DK		 338 if (bh)
339 BUFFER_TRACE(bh, "abort");
340
341 if (!handle->h_err)
342 handle->h_err = err;
343
344 if (is_handle_aborted(handle))
345 return;
346
90c7201b
TT		 347 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
348 caller, line, errstr, err_fn);
ac27a0ec 349
dab291af 350 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 351}
352
1c13d5c0
TT		 353static void __save_error_info(struct super_block *sb, const char *func,
354 unsigned int line)
355{
356 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
357
358 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
359 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
360 es->s_last_error_time = cpu_to_le32(get_seconds());
361 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
362 es->s_last_error_line = cpu_to_le32(line);
363 if (!es->s_first_error_time) {
364 es->s_first_error_time = es->s_last_error_time;
365 strncpy(es->s_first_error_func, func,
366 sizeof(es->s_first_error_func));
367 es->s_first_error_line = cpu_to_le32(line);
368 es->s_first_error_ino = es->s_last_error_ino;
369 es->s_first_error_block = es->s_last_error_block;
370 }
66e61a9e
TT		 371 /*
372 * Start the daily error reporting function if it hasn't been
373 * started already
374 */
375 if (!es->s_error_count)
376 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 377 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
378}
379
380static void save_error_info(struct super_block *sb, const char *func,
381 unsigned int line)
382{
383 __save_error_info(sb, func, line);
384 ext4_commit_super(sb, 1);
385}
386
387
ac27a0ec
DK		 388/* Deal with the reporting of failure conditions on a filesystem such as
389 * inconsistencies detected or read IO failures.
390 *
391 * On ext2, we can store the error state of the filesystem in the
617ba13b 392 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 393 * write ordering constraints on the superblock which prevent us from
394 * writing it out straight away; and given that the journal is about to
395 * be aborted, we can't rely on the current, or future, transactions to
396 * write out the superblock safely.
397 *
dab291af 398 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 399 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 400 * that error until we've noted it down and cleared it.
401 */
402
617ba13b 403static void ext4_handle_error(struct super_block *sb)
ac27a0ec 404{
ac27a0ec
DK		 405 if (sb->s_flags & MS_RDONLY)
406 return;
407
2b2d6d01 408 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 409 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 410
4ab2f15b 411 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 412 if (journal)
dab291af 413 jbd2_journal_abort(journal, -EIO);
ac27a0ec 414 }
2b2d6d01 415 if (test_opt(sb, ERRORS_RO)) {
b31e1552 416 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 417 sb->s_flags |= MS_RDONLY;
418 }
ac27a0ec 419 if (test_opt(sb, ERRORS_PANIC))
617ba13b 420 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 421 sb->s_id);
422}
423
12062ddd 424void __ext4_error(struct super_block *sb, const char *function,
c398eda0 425 unsigned int line, const char *fmt, ...)
ac27a0ec 426{
0ff2ea7d 427 struct va_format vaf;
ac27a0ec
DK		 428 va_list args;
429
430 va_start(args, fmt);
0ff2ea7d
JP		 431 vaf.fmt = fmt;
432 vaf.va = &args;
433 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
434 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 435 va_end(args);
436
617ba13b 437 ext4_handle_error(sb);
ac27a0ec
DK		 438}
439
c398eda0
TT		 440void ext4_error_inode(struct inode *inode, const char *function,
441 unsigned int line, ext4_fsblk_t block,
273df556
FM		 442 const char *fmt, ...)
443{
444 va_list args;
f7c21177 445 struct va_format vaf;
1c13d5c0 446 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 447
1c13d5c0
TT		 448 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
449 es->s_last_error_block = cpu_to_le64(block);
450 save_error_info(inode->i_sb, function, line);
273df556 451 va_start(args, fmt);
f7c21177
TT		 452 vaf.fmt = fmt;
453 vaf.va = &args;
c398eda0
TT		 454 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
455 inode->i_sb->s_id, function, line, inode->i_ino);
456 if (block)
f7c21177
TT		 457 printk(KERN_CONT "block %llu: ", block);
458 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
273df556
FM		 459 va_end(args);
460
461 ext4_handle_error(inode->i_sb);
462}
463
c398eda0 464void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 465 unsigned int line, ext4_fsblk_t block,
466 const char *fmt, ...)
273df556
FM		 467{
468 va_list args;
f7c21177 469 struct va_format vaf;
1c13d5c0 470 struct ext4_super_block *es;
273df556
FM		 471 struct inode *inode = file->f_dentry->d_inode;
472 char pathname[80], *path;
473
1c13d5c0
TT		 474 es = EXT4_SB(inode->i_sb)->s_es;
475 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
476 save_error_info(inode->i_sb, function, line);
273df556 477 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 478 if (IS_ERR(path))
273df556
FM		 479 path = "(unknown)";
480 printk(KERN_CRIT
f7c21177
TT		 481 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
482 inode->i_sb->s_id, function, line, inode->i_ino);
483 if (block)
484 printk(KERN_CONT "block %llu: ", block);
485 va_start(args, fmt);
486 vaf.fmt = fmt;
487 vaf.va = &args;
488 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
273df556
FM		 489 va_end(args);
490
491 ext4_handle_error(inode->i_sb);
492}
493
2b2d6d01 494static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 495 char nbuf[16])
496{
497 char *errstr = NULL;
498
499 switch (errno) {
500 case -EIO:
501 errstr = "IO failure";
502 break;
503 case -ENOMEM:
504 errstr = "Out of memory";
505 break;
506 case -EROFS:
78f1ddbb
TT		 507 if (!sb || (EXT4_SB(sb)->s_journal &&
508 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 509 errstr = "Journal has aborted";
510 else
511 errstr = "Readonly filesystem";
512 break;
513 default:
514 /* If the caller passed in an extra buffer for unknown
515 * errors, textualise them now. Else we just return
516 * NULL. */
517 if (nbuf) {
518 /* Check for truncated error codes... */
519 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
520 errstr = nbuf;
521 }
522 break;
523 }
524
525 return errstr;
526}
527
617ba13b 528/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 529 * automatically and invokes the appropriate error response. */
530
c398eda0
TT		 531void __ext4_std_error(struct super_block *sb, const char *function,
532 unsigned int line, int errno)
ac27a0ec
DK		 533{
534 char nbuf[16];
535 const char *errstr;
536
537 /* Special case: if the error is EROFS, and we're not already
538 * inside a transaction, then there's really no point in logging
539 * an error. */
540 if (errno == -EROFS && journal_current_handle() == NULL &&
541 (sb->s_flags & MS_RDONLY))
542 return;
543
617ba13b 544 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 545 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
546 sb->s_id, function, line, errstr);
1c13d5c0 547 save_error_info(sb, function, line);
ac27a0ec 548
617ba13b 549 ext4_handle_error(sb);
ac27a0ec
DK		 550}
551
552/*
617ba13b 553 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 554 * abort function may be used to deal with unrecoverable failures such
555 * as journal IO errors or ENOMEM at a critical moment in log management.
556 *
557 * We unconditionally force the filesystem into an ABORT|READONLY state,
558 * unless the error response on the fs has been set to panic in which
559 * case we take the easy way out and panic immediately.
560 */
561
c67d859e 562void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 563 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 564{
565 va_list args;
566
1c13d5c0 567 save_error_info(sb, function, line);
ac27a0ec 568 va_start(args, fmt);
c398eda0
TT		 569 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
570 function, line);
ac27a0ec
DK		 571 vprintk(fmt, args);
572 printk("\n");
573 va_end(args);
574
1c13d5c0
TT		 575 if ((sb->s_flags & MS_RDONLY) == 0) {
576 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
577 sb->s_flags |= MS_RDONLY;
578 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
579 if (EXT4_SB(sb)->s_journal)
580 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
581 save_error_info(sb, function, line);
582 }
ac27a0ec 583 if (test_opt(sb, ERRORS_PANIC))
617ba13b 584 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 585}
586
0ff2ea7d 587void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 588{
0ff2ea7d 589 struct va_format vaf;
b31e1552
ES		 590 va_list args;
591
592 va_start(args, fmt);
0ff2ea7d
JP		 593 vaf.fmt = fmt;
594 vaf.va = &args;
595 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 596 va_end(args);
597}
598
12062ddd 599void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 600 unsigned int line, const char *fmt, ...)
ac27a0ec 601{
0ff2ea7d 602 struct va_format vaf;
ac27a0ec
DK		 603 va_list args;
604
605 va_start(args, fmt);
0ff2ea7d
JP		 606 vaf.fmt = fmt;
607 vaf.va = &args;
608 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
609 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 610 va_end(args);
611}
612
e29136f8
TT		 613void __ext4_grp_locked_error(const char *function, unsigned int line,
614 struct super_block *sb, ext4_group_t grp,
615 unsigned long ino, ext4_fsblk_t block,
616 const char *fmt, ...)
5d1b1b3f
AK		 617__releases(bitlock)
618__acquires(bitlock)
619{
0ff2ea7d 620 struct va_format vaf;
5d1b1b3f
AK		 621 va_list args;
622 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
623
1c13d5c0
TT		 624 es->s_last_error_ino = cpu_to_le32(ino);
625 es->s_last_error_block = cpu_to_le64(block);
626 __save_error_info(sb, function, line);
0ff2ea7d 627
5d1b1b3f 628 va_start(args, fmt);
0ff2ea7d
JP		 629
630 vaf.fmt = fmt;
631 vaf.va = &args;
21149d61 632 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 633 sb->s_id, function, line, grp);
634 if (ino)
0ff2ea7d 635 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 636 if (block)
0ff2ea7d
JP		 637 printk(KERN_CONT "block %llu:", (unsigned long long) block);
638 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 639 va_end(args);
640
641 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 642 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 643 return;
644 }
1c13d5c0 645
5d1b1b3f
AK		 646 ext4_unlock_group(sb, grp);
647 ext4_handle_error(sb);
648 /*
649 * We only get here in the ERRORS_RO case; relocking the group
650 * may be dangerous, but nothing bad will happen since the
651 * filesystem will have already been marked read/only and the
652 * journal has been aborted. We return 1 as a hint to callers
653 * who might what to use the return value from
25985edc 654 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 655 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
656 * aggressively from the ext4 function in question, with a
657 * more appropriate error code.
658 */
659 ext4_lock_group(sb, grp);
660 return;
661}
662
617ba13b 663void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 664{
617ba13b 665 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 666
617ba13b 667 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 668 return;
669
12062ddd 670 ext4_warning(sb,
ac27a0ec
DK		 671 "updating to rev %d because of new feature flag, "
672 "running e2fsck is recommended",
617ba13b 673 EXT4_DYNAMIC_REV);
ac27a0ec 674
617ba13b
MC		 675 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
676 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
677 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 678 /* leave es->s_feature_*compat flags alone */
679 /* es->s_uuid will be set by e2fsck if empty */
680
681 /*
682 * The rest of the superblock fields should be zero, and if not it
683 * means they are likely already in use, so leave them alone. We
684 * can leave it up to e2fsck to clean up any inconsistencies there.
685 */
686}
687
688/*
689 * Open the external journal device
690 */
b31e1552 691static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 692{
693 struct block_device *bdev;
694 char b[BDEVNAME_SIZE];
695
d4d77629 696 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 697 if (IS_ERR(bdev))
698 goto fail;
699 return bdev;
700
701fail:
b31e1552 702 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 703 __bdevname(dev, b), PTR_ERR(bdev));
704 return NULL;
705}
706
707/*
708 * Release the journal device
709 */
617ba13b 710static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 711{
e525fd89 712 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 713}
714
617ba13b 715static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 716{
717 struct block_device *bdev;
718 int ret = -ENODEV;
719
720 bdev = sbi->journal_bdev;
721 if (bdev) {
617ba13b 722 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 723 sbi->journal_bdev = NULL;
724 }
725 return ret;
726}
727
728static inline struct inode *orphan_list_entry(struct list_head *l)
729{
617ba13b 730 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 731}
732
617ba13b 733static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 734{
735 struct list_head *l;
736
b31e1552
ES		 737 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
738 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 739
740 printk(KERN_ERR "sb_info orphan list:\n");
741 list_for_each(l, &sbi->s_orphan) {
742 struct inode *inode = orphan_list_entry(l);
743 printk(KERN_ERR " "
744 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
745 inode->i_sb->s_id, inode->i_ino, inode,
746 inode->i_mode, inode->i_nlink,
747 NEXT_ORPHAN(inode));
748 }
749}
750
2b2d6d01 751static void ext4_put_super(struct super_block *sb)
ac27a0ec 752{
617ba13b
MC		 753 struct ext4_sb_info *sbi = EXT4_SB(sb);
754 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 755 int i, err;
ac27a0ec 756
857ac889 757 ext4_unregister_li_request(sb);
e0ccfd95
CH		 758 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
759
4c0425ff
MC		 760 flush_workqueue(sbi->dio_unwritten_wq);
761 destroy_workqueue(sbi->dio_unwritten_wq);
762
a9e220f8 763 lock_super(sb);
8c85e125 764 if (sb->s_dirt)
ebc1ac16 765 ext4_commit_super(sb, 1);
8c85e125 766
0390131b
FM		 767 if (sbi->s_journal) {
768 err = jbd2_journal_destroy(sbi->s_journal);
769 sbi->s_journal = NULL;
770 if (err < 0)
c67d859e 771 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 772 }
d4edac31 773
a1c6c569 774 del_timer(&sbi->s_err_report);
d4edac31
JB		 775 ext4_release_system_zone(sb);
776 ext4_mb_release(sb);
777 ext4_ext_release(sb);
778 ext4_xattr_put_super(sb);
779
ac27a0ec 780 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 781 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 782 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 783 ext4_commit_super(sb, 1);
ac27a0ec 784 }
240799cd 785 if (sbi->s_proc) {
9f6200bb 786 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 787 }
3197ebdb 788 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 789
790 for (i = 0; i < sbi->s_gdb_count; i++)
791 brelse(sbi->s_group_desc[i]);
792 kfree(sbi->s_group_desc);
c5ca7c76
TT		 793 if (is_vmalloc_addr(sbi->s_flex_groups))
794 vfree(sbi->s_flex_groups);
795 else
796 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 797 percpu_counter_destroy(&sbi->s_freeblocks_counter);
798 percpu_counter_destroy(&sbi->s_freeinodes_counter);
799 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 800 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 801 brelse(sbi->s_sbh);
802#ifdef CONFIG_QUOTA
803 for (i = 0; i < MAXQUOTAS; i++)
804 kfree(sbi->s_qf_names[i]);
805#endif
806
807 /* Debugging code just in case the in-memory inode orphan list
808 * isn't empty. The on-disk one can be non-empty if we've
809 * detected an error and taken the fs readonly, but the
810 * in-memory list had better be clean by this point. */
811 if (!list_empty(&sbi->s_orphan))
812 dump_orphan_list(sb, sbi);
813 J_ASSERT(list_empty(&sbi->s_orphan));
814
f98393a6 815 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 816 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
817 /*
818 * Invalidate the journal device's buffers. We don't want them
819 * floating about in memory - the physical journal device may
820 * hotswapped, and it breaks the `ro-after' testing code.
821 */
822 sync_blockdev(sbi->journal_bdev);
f98393a6 823 invalidate_bdev(sbi->journal_bdev);
617ba13b 824 ext4_blkdev_remove(sbi);
ac27a0ec 825 }
c5e06d10
JL		 826 if (sbi->s_mmp_tsk)
827 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 828 sb->s_fs_info = NULL;
3197ebdb
TT		 829 /*
830 * Now that we are completely done shutting down the
831 * superblock, we need to actually destroy the kobject.
832 */
3197ebdb
TT		 833 unlock_super(sb);
834 kobject_put(&sbi->s_kobj);
835 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 836 kfree(sbi->s_blockgroup_lock);
ac27a0ec 837 kfree(sbi);
ac27a0ec
DK		 838}
839
e18b890b 840static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 841
842/*
843 * Called inside transaction, so use GFP_NOFS
844 */
617ba13b 845static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 846{
617ba13b 847 struct ext4_inode_info *ei;
ac27a0ec 848
e6b4f8da 849 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 850 if (!ei)
851 return NULL;
0b8e58a1 852
ac27a0ec 853 ei->vfs_inode.i_version = 1;
91246c00 854 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 855 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 856 INIT_LIST_HEAD(&ei->i_prealloc_list);
857 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 858 ei->i_reserved_data_blocks = 0;
859 ei->i_reserved_meta_blocks = 0;
860 ei->i_allocated_meta_blocks = 0;
9d0be502 861 ei->i_da_metadata_calc_len = 0;
d2a17637 862 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 863#ifdef CONFIG_QUOTA
864 ei->i_reserved_quota = 0;
865#endif
8aefcd55 866 ei->jinode = NULL;
c7064ef1 867 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 868 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 869 ei->cur_aio_dio = NULL;
b436b9be
JK		 870 ei->i_sync_tid = 0;
871 ei->i_datasync_tid = 0;
f7ad6d2e 872 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 873 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 874
ac27a0ec
DK		 875 return &ei->vfs_inode;
876}
877
7ff9c073
TT		 878static int ext4_drop_inode(struct inode *inode)
879{
880 int drop = generic_drop_inode(inode);
881
882 trace_ext4_drop_inode(inode, drop);
883 return drop;
884}
885
fa0d7e3d
NP		 886static void ext4_i_callback(struct rcu_head *head)
887{
888 struct inode *inode = container_of(head, struct inode, i_rcu);
889 INIT_LIST_HEAD(&inode->i_dentry);
890 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
891}
892
617ba13b 893static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 894{
f7ad6d2e 895 ext4_ioend_wait(inode);
9f7dd93d 896 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 897 ext4_msg(inode->i_sb, KERN_ERR,
898 "Inode %lu (%p): orphan list check failed!",
899 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 900 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
901 EXT4_I(inode), sizeof(struct ext4_inode_info),
902 true);
903 dump_stack();
904 }
fa0d7e3d 905 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 906}
907
51cc5068 908static void init_once(void *foo)
ac27a0ec 909{
617ba13b 910 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 911
a35afb83 912 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 913#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 914 init_rwsem(&ei->xattr_sem);
ac27a0ec 915#endif
0e855ac8 916 init_rwsem(&ei->i_data_sem);
a35afb83 917 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 918}
919
920static int init_inodecache(void)
921{
617ba13b
MC		 922 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
923 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 924 0, (SLAB_RECLAIM_ACCOUNT|
925 SLAB_MEM_SPREAD),
20c2df83 926 init_once);
617ba13b 927 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 928 return -ENOMEM;
929 return 0;
930}
931
932static void destroy_inodecache(void)
933{
617ba13b 934 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 935}
936
0930fcc1 937void ext4_clear_inode(struct inode *inode)
ac27a0ec 938{
0930fcc1
AV		 939 invalidate_inode_buffers(inode);
940 end_writeback(inode);
9f754758 941 dquot_drop(inode);
c2ea3fde 942 ext4_discard_preallocations(inode);
8aefcd55
TT		 943 if (EXT4_I(inode)->jinode) {
944 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
945 EXT4_I(inode)->jinode);
946 jbd2_free_inode(EXT4_I(inode)->jinode);
947 EXT4_I(inode)->jinode = NULL;
948 }
ac27a0ec
DK		 949}
950
2b2d6d01
TT		 951static inline void ext4_show_quota_options(struct seq_file *seq,
952 struct super_block *sb)
ac27a0ec
DK		 953{
954#if defined(CONFIG_QUOTA)
617ba13b 955 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 956
5a20bdfc
JK		 957 if (sbi->s_jquota_fmt) {
958 char *fmtname = "";
959
960 switch (sbi->s_jquota_fmt) {
961 case QFMT_VFS_OLD:
962 fmtname = "vfsold";
963 break;
964 case QFMT_VFS_V0:
965 fmtname = "vfsv0";
966 break;
967 case QFMT_VFS_V1:
968 fmtname = "vfsv1";
969 break;
970 }
971 seq_printf(seq, ",jqfmt=%s", fmtname);
972 }
ac27a0ec
DK		 973
974 if (sbi->s_qf_names[USRQUOTA])
975 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
976
977 if (sbi->s_qf_names[GRPQUOTA])
978 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
979
482a7425 980 if (test_opt(sb, USRQUOTA))
ac27a0ec
DK		 981 seq_puts(seq, ",usrquota");
982
482a7425 983 if (test_opt(sb, GRPQUOTA))
ac27a0ec
DK		 984 seq_puts(seq, ",grpquota");
985#endif
986}
987
d9c9bef1
MS		 988/*
989 * Show an option if
990 * - it's set to a non-default value OR
991 * - if the per-sb default is different from the global default
992 */
617ba13b 993static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 994{
aa22df2c
AK		 995 int def_errors;
996 unsigned long def_mount_opts;
ac27a0ec 997 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 998 struct ext4_sb_info *sbi = EXT4_SB(sb);
999 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 1000
1001 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 1002 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 1003
1004 if (sbi->s_sb_block != 1)
1005 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1006 if (test_opt(sb, MINIX_DF))
1007 seq_puts(seq, ",minixdf");
aa22df2c 1008 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 1009 seq_puts(seq, ",grpid");
1010 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1011 seq_puts(seq, ",nogrpid");
1012 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1013 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1014 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1015 }
1016 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1017 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1018 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1019 }
bb4f397a 1020 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 1021 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 1022 def_errors == EXT4_ERRORS_CONTINUE) {
1023 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 1024 }
1025 }
aa22df2c 1026 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 1027 seq_puts(seq, ",errors=continue");
aa22df2c 1028 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 1029 seq_puts(seq, ",errors=panic");
aa22df2c 1030 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 1031 seq_puts(seq, ",nouid32");
aa22df2c 1032 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 1033 seq_puts(seq, ",debug");
1034 if (test_opt(sb, OLDALLOC))
1035 seq_puts(seq, ",oldalloc");
03010a33 1036#ifdef CONFIG_EXT4_FS_XATTR
ea663336 1037 if (test_opt(sb, XATTR_USER))
d9c9bef1 1038 seq_puts(seq, ",user_xattr");
ea663336 1039 if (!test_opt(sb, XATTR_USER))
d9c9bef1 1040 seq_puts(seq, ",nouser_xattr");
d9c9bef1 1041#endif
03010a33 1042#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 1043 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 1044 seq_puts(seq, ",acl");
1045 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1046 seq_puts(seq, ",noacl");
1047#endif
30773840 1048 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 1049 seq_printf(seq, ",commit=%u",
1050 (unsigned) (sbi->s_commit_interval / HZ));
1051 }
30773840
TT		 1052 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1053 seq_printf(seq, ",min_batch_time=%u",
1054 (unsigned) sbi->s_min_batch_time);
1055 }
1056 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1057 seq_printf(seq, ",max_batch_time=%u",
1058 (unsigned) sbi->s_min_batch_time);
1059 }
1060
571640ca
ES		 1061 /*
1062 * We're changing the default of barrier mount option, so
1063 * let's always display its mount state so it's clear what its
1064 * status is.
1065 */
1066 seq_puts(seq, ",barrier=");
1067 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 1068 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1069 seq_puts(seq, ",journal_async_commit");
39a4bade
JK		 1070 else if (test_opt(sb, JOURNAL_CHECKSUM))
1071 seq_puts(seq, ",journal_checksum");
25ec56b5
JNC		 1072 if (test_opt(sb, I_VERSION))
1073 seq_puts(seq, ",i_version");
8b67f04a
TT		 1074 if (!test_opt(sb, DELALLOC) &&
1075 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
dd919b98
AK		 1076 seq_puts(seq, ",nodelalloc");
1077
6fd7a467
TT		 1078 if (!test_opt(sb, MBLK_IO_SUBMIT))
1079 seq_puts(seq, ",nomblk_io_submit");
cb45bbe4
MS		 1080 if (sbi->s_stripe)
1081 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 1082 /*
1083 * journal mode get enabled in different ways
1084 * So just print the value even if we didn't specify it
1085 */
617ba13b 1086 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 1087 seq_puts(seq, ",data=journal");
617ba13b 1088 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 1089 seq_puts(seq, ",data=ordered");
617ba13b 1090 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 1091 seq_puts(seq, ",data=writeback");
1092
240799cd
TT		 1093 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1094 seq_printf(seq, ",inode_readahead_blks=%u",
1095 sbi->s_inode_readahead_blks);
1096
5bf5683a
HK		 1097 if (test_opt(sb, DATA_ERR_ABORT))
1098 seq_puts(seq, ",data_err=abort");
1099
afd4672d 1100 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 1101 seq_puts(seq, ",noauto_da_alloc");
afd4672d 1102
8b67f04a 1103 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
5328e635
ES		 1104 seq_puts(seq, ",discard");
1105
e3bb52ae
ES		 1106 if (test_opt(sb, NOLOAD))
1107 seq_puts(seq, ",norecovery");
1108
744692dc
JZ		 1109 if (test_opt(sb, DIOREAD_NOLOCK))
1110 seq_puts(seq, ",dioread_nolock");
1111
8b67f04a
TT		 1112 if (test_opt(sb, BLOCK_VALIDITY) &&
1113 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1114 seq_puts(seq, ",block_validity");
1115
bfff6873
LC		 1116 if (!test_opt(sb, INIT_INODE_TABLE))
1117 seq_puts(seq, ",noinit_inode_table");
51ce6511 1118 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
bfff6873
LC		 1119 seq_printf(seq, ",init_inode_table=%u",
1120 (unsigned) sbi->s_li_wait_mult);
1121
617ba13b 1122 ext4_show_quota_options(seq, sb);
0b8e58a1 1123
ac27a0ec
DK		 1124 return 0;
1125}
1126
1b961ac0 1127static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1128 u64 ino, u32 generation)
ac27a0ec 1129{
ac27a0ec 1130 struct inode *inode;
ac27a0ec 1131
617ba13b 1132 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1133 return ERR_PTR(-ESTALE);
617ba13b 1134 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1135 return ERR_PTR(-ESTALE);
1136
1137 /* iget isn't really right if the inode is currently unallocated!!
1138 *
617ba13b 1139 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1140 * deleted, so we should be safe.
1141 *
1142 * Currently we don't know the generation for parent directory, so
1143 * a generation of 0 means "accept any"
1144 */
1d1fe1ee
DH		 1145 inode = ext4_iget(sb, ino);
1146 if (IS_ERR(inode))
1147 return ERR_CAST(inode);
1148 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1149 iput(inode);
1150 return ERR_PTR(-ESTALE);
1151 }
1b961ac0
CH		 1152
1153 return inode;
1154}
1155
1156static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1157 int fh_len, int fh_type)
1b961ac0
CH		 1158{
1159 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1160 ext4_nfs_get_inode);
1161}
1162
1163static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1164 int fh_len, int fh_type)
1b961ac0
CH		 1165{
1166 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1167 ext4_nfs_get_inode);
ac27a0ec
DK		 1168}
1169
c39a7f84
TO		 1170/*
1171 * Try to release metadata pages (indirect blocks, directories) which are
1172 * mapped via the block device. Since these pages could have journal heads
1173 * which would prevent try_to_free_buffers() from freeing them, we must use
1174 * jbd2 layer's try_to_free_buffers() function to release them.
1175 */
0b8e58a1
AD		 1176static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1177 gfp_t wait)
c39a7f84
TO		 1178{
1179 journal_t *journal = EXT4_SB(sb)->s_journal;
1180
1181 WARN_ON(PageChecked(page));
1182 if (!page_has_buffers(page))
1183 return 0;
1184 if (journal)
1185 return jbd2_journal_try_to_free_buffers(journal, page,
1186 wait & ~__GFP_WAIT);
1187 return try_to_free_buffers(page);
1188}
1189
ac27a0ec 1190#ifdef CONFIG_QUOTA
af5bc92d 1191#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1192#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1193
617ba13b
MC		 1194static int ext4_write_dquot(struct dquot *dquot);
1195static int ext4_acquire_dquot(struct dquot *dquot);
1196static int ext4_release_dquot(struct dquot *dquot);
1197static int ext4_mark_dquot_dirty(struct dquot *dquot);
1198static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1199static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1200 struct path *path);
ca0e05e4 1201static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1202static int ext4_quota_on_mount(struct super_block *sb, int type);
1203static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1204 size_t len, loff_t off);
617ba13b 1205static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1206 const char *data, size_t len, loff_t off);
1207
61e225dc 1208static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1209 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1210 .write_dquot = ext4_write_dquot,
1211 .acquire_dquot = ext4_acquire_dquot,
1212 .release_dquot = ext4_release_dquot,
1213 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1214 .write_info = ext4_write_info,
1215 .alloc_dquot = dquot_alloc,
1216 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1217};
1218
0d54b217 1219static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1220 .quota_on = ext4_quota_on,
ca0e05e4 1221 .quota_off = ext4_quota_off,
287a8095
CH		 1222 .quota_sync = dquot_quota_sync,
1223 .get_info = dquot_get_dqinfo,
1224 .set_info = dquot_set_dqinfo,
1225 .get_dqblk = dquot_get_dqblk,
1226 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1227};
1228#endif
1229
ee9b6d61 1230static const struct super_operations ext4_sops = {
617ba13b
MC		 1231 .alloc_inode = ext4_alloc_inode,
1232 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1233 .write_inode = ext4_write_inode,
1234 .dirty_inode = ext4_dirty_inode,
7ff9c073 1235 .drop_inode = ext4_drop_inode,
0930fcc1 1236 .evict_inode = ext4_evict_inode,
617ba13b 1237 .put_super = ext4_put_super,
617ba13b 1238 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1239 .freeze_fs = ext4_freeze,
1240 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1241 .statfs = ext4_statfs,
1242 .remount_fs = ext4_remount,
617ba13b 1243 .show_options = ext4_show_options,
ac27a0ec 1244#ifdef CONFIG_QUOTA
617ba13b
MC		 1245 .quota_read = ext4_quota_read,
1246 .quota_write = ext4_quota_write,
ac27a0ec 1247#endif
c39a7f84 1248 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1249};
1250
9ca92389
TT		 1251static const struct super_operations ext4_nojournal_sops = {
1252 .alloc_inode = ext4_alloc_inode,
1253 .destroy_inode = ext4_destroy_inode,
1254 .write_inode = ext4_write_inode,
1255 .dirty_inode = ext4_dirty_inode,
7ff9c073 1256 .drop_inode = ext4_drop_inode,
0930fcc1 1257 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1258 .write_super = ext4_write_super,
1259 .put_super = ext4_put_super,
1260 .statfs = ext4_statfs,
1261 .remount_fs = ext4_remount,
9ca92389
TT		 1262 .show_options = ext4_show_options,
1263#ifdef CONFIG_QUOTA
1264 .quota_read = ext4_quota_read,
1265 .quota_write = ext4_quota_write,
1266#endif
1267 .bdev_try_to_free_page = bdev_try_to_free_page,
1268};
1269
39655164 1270static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1271 .fh_to_dentry = ext4_fh_to_dentry,
1272 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1273 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1274};
1275
1276enum {
1277 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1278 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1279 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1280 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1281 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1282 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1283 Opt_journal_update, Opt_journal_dev,
818d276c 1284 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1285 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1286 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1287 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1288 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1289 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1290 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1291 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1292 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1293 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1294 Opt_dioread_nolock, Opt_dioread_lock,
5328e635 1295 Opt_discard, Opt_nodiscard,
bfff6873 1296 Opt_init_inode_table, Opt_noinit_inode_table,
ac27a0ec
DK		 1297};
1298
a447c093 1299static const match_table_t tokens = {
ac27a0ec
DK		 1300 {Opt_bsd_df, "bsddf"},
1301 {Opt_minix_df, "minixdf"},
1302 {Opt_grpid, "grpid"},
1303 {Opt_grpid, "bsdgroups"},
1304 {Opt_nogrpid, "nogrpid"},
1305 {Opt_nogrpid, "sysvgroups"},
1306 {Opt_resgid, "resgid=%u"},
1307 {Opt_resuid, "resuid=%u"},
1308 {Opt_sb, "sb=%u"},
1309 {Opt_err_cont, "errors=continue"},
1310 {Opt_err_panic, "errors=panic"},
1311 {Opt_err_ro, "errors=remount-ro"},
1312 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1313 {Opt_debug, "debug"},
1314 {Opt_oldalloc, "oldalloc"},
1315 {Opt_orlov, "orlov"},
1316 {Opt_user_xattr, "user_xattr"},
1317 {Opt_nouser_xattr, "nouser_xattr"},
1318 {Opt_acl, "acl"},
1319 {Opt_noacl, "noacl"},
ac27a0ec 1320 {Opt_noload, "noload"},
e3bb52ae 1321 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1322 {Opt_nobh, "nobh"},
1323 {Opt_bh, "bh"},
1324 {Opt_commit, "commit=%u"},
30773840
TT		 1325 {Opt_min_batch_time, "min_batch_time=%u"},
1326 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1327 {Opt_journal_update, "journal=update"},
ac27a0ec 1328 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1329 {Opt_journal_checksum, "journal_checksum"},
1330 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1331 {Opt_abort, "abort"},
1332 {Opt_data_journal, "data=journal"},
1333 {Opt_data_ordered, "data=ordered"},
1334 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1335 {Opt_data_err_abort, "data_err=abort"},
1336 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1337 {Opt_offusrjquota, "usrjquota="},
1338 {Opt_usrjquota, "usrjquota=%s"},
1339 {Opt_offgrpjquota, "grpjquota="},
1340 {Opt_grpjquota, "grpjquota=%s"},
1341 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1342 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1343 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1344 {Opt_grpquota, "grpquota"},
1345 {Opt_noquota, "noquota"},
1346 {Opt_quota, "quota"},
1347 {Opt_usrquota, "usrquota"},
1348 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1349 {Opt_barrier, "barrier"},
1350 {Opt_nobarrier, "nobarrier"},
25ec56b5 1351 {Opt_i_version, "i_version"},
c9de560d 1352 {Opt_stripe, "stripe=%u"},
ac27a0ec 1353 {Opt_resize, "resize"},
64769240 1354 {Opt_delalloc, "delalloc"},
dd919b98 1355 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1356 {Opt_mblk_io_submit, "mblk_io_submit"},
1357 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1358 {Opt_block_validity, "block_validity"},
1359 {Opt_noblock_validity, "noblock_validity"},
240799cd 1360 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1361 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1362 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1363 {Opt_auto_da_alloc, "auto_da_alloc"},
1364 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1365 {Opt_dioread_nolock, "dioread_nolock"},
1366 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1367 {Opt_discard, "discard"},
1368 {Opt_nodiscard, "nodiscard"},
bfff6873
LC		 1369 {Opt_init_inode_table, "init_itable=%u"},
1370 {Opt_init_inode_table, "init_itable"},
1371 {Opt_noinit_inode_table, "noinit_itable"},
f3f12faa 1372 {Opt_err, NULL},
ac27a0ec
DK		 1373};
1374
617ba13b 1375static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1376{
617ba13b 1377 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1378 char *options = (char *) *data;
1379
1380 if (!options || strncmp(options, "sb=", 3) != 0)
1381 return 1; /* Default location */
0b8e58a1 1382
ac27a0ec 1383 options += 3;
0b8e58a1 1384 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1385 sb_block = simple_strtoul(options, &options, 0);
1386 if (*options && *options != ',') {
4776004f 1387 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1388 (char *) *data);
1389 return 1;
1390 }
1391 if (*options == ',')
1392 options++;
1393 *data = (void *) options;
0b8e58a1 1394
ac27a0ec
DK		 1395 return sb_block;
1396}
1397
b3881f74 1398#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1399static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1400 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1401
56c50f11
DM		 1402#ifdef CONFIG_QUOTA
1403static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1404{
1405 struct ext4_sb_info *sbi = EXT4_SB(sb);
1406 char *qname;
1407
1408 if (sb_any_quota_loaded(sb) &&
1409 !sbi->s_qf_names[qtype]) {
1410 ext4_msg(sb, KERN_ERR,
1411 "Cannot change journaled "
1412 "quota options when quota turned on");
1413 return 0;
1414 }
1415 qname = match_strdup(args);
1416 if (!qname) {
1417 ext4_msg(sb, KERN_ERR,
1418 "Not enough memory for storing quotafile name");
1419 return 0;
1420 }
1421 if (sbi->s_qf_names[qtype] &&
1422 strcmp(sbi->s_qf_names[qtype], qname)) {
1423 ext4_msg(sb, KERN_ERR,
1424 "%s quota file already specified", QTYPE2NAME(qtype));
1425 kfree(qname);
1426 return 0;
1427 }
1428 sbi->s_qf_names[qtype] = qname;
1429 if (strchr(sbi->s_qf_names[qtype], '/')) {
1430 ext4_msg(sb, KERN_ERR,
1431 "quotafile must be on filesystem root");
1432 kfree(sbi->s_qf_names[qtype]);
1433 sbi->s_qf_names[qtype] = NULL;
1434 return 0;
1435 }
fd8c37ec 1436 set_opt(sb, QUOTA);
56c50f11
DM		 1437 return 1;
1438}
1439
1440static int clear_qf_name(struct super_block *sb, int qtype)
1441{
1442
1443 struct ext4_sb_info *sbi = EXT4_SB(sb);
1444
1445 if (sb_any_quota_loaded(sb) &&
1446 sbi->s_qf_names[qtype]) {
1447 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1448 " when quota turned on");
1449 return 0;
1450 }
1451 /*
1452 * The space will be released later when all options are confirmed
1453 * to be correct
1454 */
1455 sbi->s_qf_names[qtype] = NULL;
1456 return 1;
1457}
1458#endif
1459
2b2d6d01 1460static int parse_options(char *options, struct super_block *sb,
c3191067 1461 unsigned long *journal_devnum,
b3881f74 1462 unsigned int *journal_ioprio,
2b2d6d01 1463 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1464{
617ba13b 1465 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1466 char *p;
ac27a0ec
DK		 1467 substring_t args[MAX_OPT_ARGS];
1468 int data_opt = 0;
1469 int option;
1470#ifdef CONFIG_QUOTA
56c50f11 1471 int qfmt;
ac27a0ec
DK		 1472#endif
1473
1474 if (!options)
1475 return 1;
1476
2b2d6d01 1477 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1478 int token;
1479 if (!*p)
1480 continue;
1481
15121c18
ES		 1482 /*
1483 * Initialize args struct so we know whether arg was
1484 * found; some options take optional arguments.
1485 */
7dc57615 1486 args[0].to = args[0].from = NULL;
ac27a0ec
DK		 1487 token = match_token(p, tokens, args);
1488 switch (token) {
1489 case Opt_bsd_df:
437ca0fd 1490 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1491 clear_opt(sb, MINIX_DF);
ac27a0ec
DK		 1492 break;
1493 case Opt_minix_df:
437ca0fd 1494 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1495 set_opt(sb, MINIX_DF);
437ca0fd 1496
ac27a0ec
DK		 1497 break;
1498 case Opt_grpid:
437ca0fd 1499 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1500 set_opt(sb, GRPID);
437ca0fd 1501
ac27a0ec
DK		 1502 break;
1503 case Opt_nogrpid:
437ca0fd 1504 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1505 clear_opt(sb, GRPID);
437ca0fd 1506
ac27a0ec
DK		 1507 break;
1508 case Opt_resuid:
1509 if (match_int(&args[0], &option))
1510 return 0;
1511 sbi->s_resuid = option;
1512 break;
1513 case Opt_resgid:
1514 if (match_int(&args[0], &option))
1515 return 0;
1516 sbi->s_resgid = option;
1517 break;
1518 case Opt_sb:
1519 /* handled by get_sb_block() instead of here */
1520 /* *sb_block = match_int(&args[0]); */
1521 break;
1522 case Opt_err_panic:
fd8c37ec
TT		 1523 clear_opt(sb, ERRORS_CONT);
1524 clear_opt(sb, ERRORS_RO);
1525 set_opt(sb, ERRORS_PANIC);
ac27a0ec
DK		 1526 break;
1527 case Opt_err_ro:
fd8c37ec
TT		 1528 clear_opt(sb, ERRORS_CONT);
1529 clear_opt(sb, ERRORS_PANIC);
1530 set_opt(sb, ERRORS_RO);
ac27a0ec
DK		 1531 break;
1532 case Opt_err_cont:
fd8c37ec
TT		 1533 clear_opt(sb, ERRORS_RO);
1534 clear_opt(sb, ERRORS_PANIC);
1535 set_opt(sb, ERRORS_CONT);
ac27a0ec
DK		 1536 break;
1537 case Opt_nouid32:
fd8c37ec 1538 set_opt(sb, NO_UID32);
ac27a0ec 1539 break;
ac27a0ec 1540 case Opt_debug:
fd8c37ec 1541 set_opt(sb, DEBUG);
ac27a0ec
DK		 1542 break;
1543 case Opt_oldalloc:
fd8c37ec 1544 set_opt(sb, OLDALLOC);
ac27a0ec
DK		 1545 break;
1546 case Opt_orlov:
fd8c37ec 1547 clear_opt(sb, OLDALLOC);
ac27a0ec 1548 break;
03010a33 1549#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1550 case Opt_user_xattr:
fd8c37ec 1551 set_opt(sb, XATTR_USER);
ac27a0ec
DK		 1552 break;
1553 case Opt_nouser_xattr:
fd8c37ec 1554 clear_opt(sb, XATTR_USER);
ac27a0ec
DK		 1555 break;
1556#else
1557 case Opt_user_xattr:
1558 case Opt_nouser_xattr:
b31e1552 1559 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1560 break;
1561#endif
03010a33 1562#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec 1563 case Opt_acl:
fd8c37ec 1564 set_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1565 break;
1566 case Opt_noacl:
fd8c37ec 1567 clear_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1568 break;
1569#else
1570 case Opt_acl:
1571 case Opt_noacl:
b31e1552 1572 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1573 break;
1574#endif
ac27a0ec
DK		 1575 case Opt_journal_update:
1576 /* @@@ FIXME */
1577 /* Eventually we will want to be able to create
1578 a journal file here. For now, only allow the
1579 user to specify an existing inode to be the
1580 journal file. */
1581 if (is_remount) {
b31e1552
ES		 1582 ext4_msg(sb, KERN_ERR,
1583 "Cannot specify journal on remount");
ac27a0ec
DK		 1584 return 0;
1585 }
fd8c37ec 1586 set_opt(sb, UPDATE_JOURNAL);
ac27a0ec 1587 break;
ac27a0ec
DK		 1588 case Opt_journal_dev:
1589 if (is_remount) {
b31e1552
ES		 1590 ext4_msg(sb, KERN_ERR,
1591 "Cannot specify journal on remount");
ac27a0ec
DK		 1592 return 0;
1593 }
1594 if (match_int(&args[0], &option))
1595 return 0;
1596 *journal_devnum = option;
1597 break;
818d276c 1598 case Opt_journal_checksum:
fd8c37ec 1599 set_opt(sb, JOURNAL_CHECKSUM);
d4da6c9c 1600 break;
818d276c 1601 case Opt_journal_async_commit:
fd8c37ec
TT		 1602 set_opt(sb, JOURNAL_ASYNC_COMMIT);
1603 set_opt(sb, JOURNAL_CHECKSUM);
818d276c 1604 break;
ac27a0ec 1605 case Opt_noload:
fd8c37ec 1606 set_opt(sb, NOLOAD);
ac27a0ec
DK		 1607 break;
1608 case Opt_commit:
1609 if (match_int(&args[0], &option))
1610 return 0;
1611 if (option < 0)
1612 return 0;
1613 if (option == 0)
cd02ff0b 1614 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1615 sbi->s_commit_interval = HZ * option;
1616 break;
30773840
TT		 1617 case Opt_max_batch_time:
1618 if (match_int(&args[0], &option))
1619 return 0;
1620 if (option < 0)
1621 return 0;
1622 if (option == 0)
1623 option = EXT4_DEF_MAX_BATCH_TIME;
1624 sbi->s_max_batch_time = option;
1625 break;
1626 case Opt_min_batch_time:
1627 if (match_int(&args[0], &option))
1628 return 0;
1629 if (option < 0)
1630 return 0;
1631 sbi->s_min_batch_time = option;
1632 break;
ac27a0ec 1633 case Opt_data_journal:
617ba13b 1634 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1635 goto datacheck;
1636 case Opt_data_ordered:
617ba13b 1637 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1638 goto datacheck;
1639 case Opt_data_writeback:
617ba13b 1640 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1641 datacheck:
1642 if (is_remount) {
482a7425 1643 if (test_opt(sb, DATA_FLAGS) != data_opt) {
b31e1552
ES		 1644 ext4_msg(sb, KERN_ERR,
1645 "Cannot change data mode on remount");
ac27a0ec
DK		 1646 return 0;
1647 }
1648 } else {
fd8c37ec 1649 clear_opt(sb, DATA_FLAGS);
ac27a0ec
DK		 1650 sbi->s_mount_opt |= data_opt;
1651 }
1652 break;
5bf5683a 1653 case Opt_data_err_abort:
fd8c37ec 1654 set_opt(sb, DATA_ERR_ABORT);
5bf5683a
HK		 1655 break;
1656 case Opt_data_err_ignore:
fd8c37ec 1657 clear_opt(sb, DATA_ERR_ABORT);
5bf5683a 1658 break;
ac27a0ec
DK		 1659#ifdef CONFIG_QUOTA
1660 case Opt_usrjquota:
56c50f11 1661 if (!set_qf_name(sb, USRQUOTA, &args[0]))
ac27a0ec 1662 return 0;
56c50f11
DM		 1663 break;
1664 case Opt_grpjquota:
1665 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
ac27a0ec 1666 return 0;
ac27a0ec
DK		 1667 break;
1668 case Opt_offusrjquota:
56c50f11
DM		 1669 if (!clear_qf_name(sb, USRQUOTA))
1670 return 0;
1671 break;
ac27a0ec 1672 case Opt_offgrpjquota:
56c50f11 1673 if (!clear_qf_name(sb, GRPQUOTA))
ac27a0ec 1674 return 0;
ac27a0ec 1675 break;
56c50f11 1676
ac27a0ec 1677 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1678 qfmt = QFMT_VFS_OLD;
1679 goto set_qf_format;
ac27a0ec 1680 case Opt_jqfmt_vfsv0:
dfc5d03f 1681 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1682 goto set_qf_format;
1683 case Opt_jqfmt_vfsv1:
1684 qfmt = QFMT_VFS_V1;
dfc5d03f 1685set_qf_format:
17bd13b3 1686 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1687 sbi->s_jquota_fmt != qfmt) {
b31e1552 1688 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1689 "journaled quota options when "
b31e1552 1690 "quota turned on");
dfc5d03f
JK		 1691 return 0;
1692 }
1693 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1694 break;
1695 case Opt_quota:
1696 case Opt_usrquota:
fd8c37ec
TT		 1697 set_opt(sb, QUOTA);
1698 set_opt(sb, USRQUOTA);
ac27a0ec
DK		 1699 break;
1700 case Opt_grpquota:
fd8c37ec
TT		 1701 set_opt(sb, QUOTA);
1702 set_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1703 break;
1704 case Opt_noquota:
17bd13b3 1705 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1706 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1707 "options when quota turned on");
ac27a0ec
DK		 1708 return 0;
1709 }
fd8c37ec
TT		 1710 clear_opt(sb, QUOTA);
1711 clear_opt(sb, USRQUOTA);
1712 clear_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1713 break;
1714#else
1715 case Opt_quota:
1716 case Opt_usrquota:
1717 case Opt_grpquota:
b31e1552
ES		 1718 ext4_msg(sb, KERN_ERR,
1719 "quota options not supported");
cd59e7b9 1720 break;
ac27a0ec
DK		 1721 case Opt_usrjquota:
1722 case Opt_grpjquota:
1723 case Opt_offusrjquota:
1724 case Opt_offgrpjquota:
1725 case Opt_jqfmt_vfsold:
1726 case Opt_jqfmt_vfsv0:
5a20bdfc 1727 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1728 ext4_msg(sb, KERN_ERR,
1729 "journaled quota options not supported");
ac27a0ec
DK		 1730 break;
1731 case Opt_noquota:
1732 break;
1733#endif
1734 case Opt_abort:
4ab2f15b 1735 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1736 break;
06705bff 1737 case Opt_nobarrier:
fd8c37ec 1738 clear_opt(sb, BARRIER);
06705bff 1739 break;
ac27a0ec 1740 case Opt_barrier:
15121c18
ES		 1741 if (args[0].from) {
1742 if (match_int(&args[0], &option))
1743 return 0;
1744 } else
1745 option = 1; /* No argument, default to 1 */
ac27a0ec 1746 if (option)
fd8c37ec 1747 set_opt(sb, BARRIER);
ac27a0ec 1748 else
fd8c37ec 1749 clear_opt(sb, BARRIER);
ac27a0ec
DK		 1750 break;
1751 case Opt_ignore:
1752 break;
1753 case Opt_resize:
1754 if (!is_remount) {
b31e1552
ES		 1755 ext4_msg(sb, KERN_ERR,
1756 "resize option only available "
1757 "for remount");
ac27a0ec
DK		 1758 return 0;
1759 }
1760 if (match_int(&args[0], &option) != 0)
1761 return 0;
1762 *n_blocks_count = option;
1763 break;
1764 case Opt_nobh:
206f7ab4
CH		 1765 ext4_msg(sb, KERN_WARNING,
1766 "Ignoring deprecated nobh option");
ac27a0ec
DK		 1767 break;
1768 case Opt_bh:
206f7ab4
CH		 1769 ext4_msg(sb, KERN_WARNING,
1770 "Ignoring deprecated bh option");
ac27a0ec 1771 break;
25ec56b5 1772 case Opt_i_version:
fd8c37ec 1773 set_opt(sb, I_VERSION);
25ec56b5
JNC		 1774 sb->s_flags |= MS_I_VERSION;
1775 break;
dd919b98 1776 case Opt_nodelalloc:
fd8c37ec 1777 clear_opt(sb, DELALLOC);
dd919b98 1778 break;
1449032b 1779 case Opt_mblk_io_submit:
fd8c37ec 1780 set_opt(sb, MBLK_IO_SUBMIT);
1449032b
TT		 1781 break;
1782 case Opt_nomblk_io_submit:
fd8c37ec 1783 clear_opt(sb, MBLK_IO_SUBMIT);
1449032b 1784 break;
c9de560d
AT		 1785 case Opt_stripe:
1786 if (match_int(&args[0], &option))
1787 return 0;
1788 if (option < 0)
1789 return 0;
1790 sbi->s_stripe = option;
1791 break;
64769240 1792 case Opt_delalloc:
fd8c37ec 1793 set_opt(sb, DELALLOC);
64769240 1794 break;
6fd058f7 1795 case Opt_block_validity:
fd8c37ec 1796 set_opt(sb, BLOCK_VALIDITY);
6fd058f7
TT		 1797 break;
1798 case Opt_noblock_validity:
fd8c37ec 1799 clear_opt(sb, BLOCK_VALIDITY);
6fd058f7 1800 break;
240799cd
TT		 1801 case Opt_inode_readahead_blks:
1802 if (match_int(&args[0], &option))
1803 return 0;
1804 if (option < 0 || option > (1 << 30))
1805 return 0;
5dbd571d 1806 if (option && !is_power_of_2(option)) {
b31e1552
ES		 1807 ext4_msg(sb, KERN_ERR,
1808 "EXT4-fs: inode_readahead_blks"
1809 " must be a power of 2");
3197ebdb
TT		 1810 return 0;
1811 }
240799cd
TT		 1812 sbi->s_inode_readahead_blks = option;
1813 break;
b3881f74
TT		 1814 case Opt_journal_ioprio:
1815 if (match_int(&args[0], &option))
1816 return 0;
1817 if (option < 0 || option > 7)
1818 break;
1819 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1820 option);
1821 break;
06705bff 1822 case Opt_noauto_da_alloc:
fd8c37ec 1823 set_opt(sb, NO_AUTO_DA_ALLOC);
06705bff 1824 break;
afd4672d 1825 case Opt_auto_da_alloc:
15121c18
ES		 1826 if (args[0].from) {
1827 if (match_int(&args[0], &option))
1828 return 0;
1829 } else
1830 option = 1; /* No argument, default to 1 */
afd4672d 1831 if (option)
fd8c37ec 1832 clear_opt(sb, NO_AUTO_DA_ALLOC);
afd4672d 1833 else
fd8c37ec 1834 set_opt(sb,NO_AUTO_DA_ALLOC);
afd4672d 1835 break;
5328e635 1836 case Opt_discard:
fd8c37ec 1837 set_opt(sb, DISCARD);
5328e635
ES		 1838 break;
1839 case Opt_nodiscard:
fd8c37ec 1840 clear_opt(sb, DISCARD);
5328e635 1841 break;
744692dc 1842 case Opt_dioread_nolock:
fd8c37ec 1843 set_opt(sb, DIOREAD_NOLOCK);
744692dc
JZ		 1844 break;
1845 case Opt_dioread_lock:
fd8c37ec 1846 clear_opt(sb, DIOREAD_NOLOCK);
744692dc 1847 break;
bfff6873 1848 case Opt_init_inode_table:
fd8c37ec 1849 set_opt(sb, INIT_INODE_TABLE);
bfff6873
LC		 1850 if (args[0].from) {
1851 if (match_int(&args[0], &option))
1852 return 0;
1853 } else
1854 option = EXT4_DEF_LI_WAIT_MULT;
1855 if (option < 0)
1856 return 0;
1857 sbi->s_li_wait_mult = option;
1858 break;
1859 case Opt_noinit_inode_table:
fd8c37ec 1860 clear_opt(sb, INIT_INODE_TABLE);
bfff6873 1861 break;
ac27a0ec 1862 default:
b31e1552
ES		 1863 ext4_msg(sb, KERN_ERR,
1864 "Unrecognized mount option \"%s\" "
1865 "or missing value", p);
ac27a0ec
DK		 1866 return 0;
1867 }
1868 }
1869#ifdef CONFIG_QUOTA
1870 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1871 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1872 clear_opt(sb, USRQUOTA);
ac27a0ec 1873
482a7425 1874 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1875 clear_opt(sb, GRPQUOTA);
ac27a0ec 1876
56c50f11 1877 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1878 ext4_msg(sb, KERN_ERR, "old and new quota "
1879 "format mixing");
ac27a0ec
DK		 1880 return 0;
1881 }
1882
1883 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1884 ext4_msg(sb, KERN_ERR, "journaled quota format "
1885 "not specified");
ac27a0ec
DK		 1886 return 0;
1887 }
1888 } else {
1889 if (sbi->s_jquota_fmt) {
b31e1552 1890 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1891 "specified with no journaling "
b31e1552 1892 "enabled");
ac27a0ec
DK		 1893 return 0;
1894 }
1895 }
1896#endif
1897 return 1;
1898}
1899
617ba13b 1900static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1901 int read_only)
1902{
617ba13b 1903 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1904 int res = 0;
1905
617ba13b 1906 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1907 ext4_msg(sb, KERN_ERR, "revision level too high, "
1908 "forcing read-only mode");
ac27a0ec
DK		 1909 res = MS_RDONLY;
1910 }
1911 if (read_only)
1912 return res;
617ba13b 1913 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1914 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1915 "running e2fsck is recommended");
617ba13b 1916 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1917 ext4_msg(sb, KERN_WARNING,
1918 "warning: mounting fs with errors, "
1919 "running e2fsck is recommended");
ed3ce80a 1920 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1921 le16_to_cpu(es->s_mnt_count) >=
1922 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1923 ext4_msg(sb, KERN_WARNING,
1924 "warning: maximal mount count reached, "
1925 "running e2fsck is recommended");
ac27a0ec
DK		 1926 else if (le32_to_cpu(es->s_checkinterval) &&
1927 (le32_to_cpu(es->s_lastcheck) +
1928 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1929 ext4_msg(sb, KERN_WARNING,
1930 "warning: checktime reached, "
1931 "running e2fsck is recommended");
0b8e58a1 1932 if (!sbi->s_journal)
0390131b 1933 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1934 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1935 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1936 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1937 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1938 ext4_update_dynamic_rev(sb);
0390131b
FM		 1939 if (sbi->s_journal)
1940 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1941
e2d67052 1942 ext4_commit_super(sb, 1);
ac27a0ec 1943 if (test_opt(sb, DEBUG))
a9df9a49 1944 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1945 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1946 sb->s_blocksize,
1947 sbi->s_groups_count,
617ba13b
MC		 1948 EXT4_BLOCKS_PER_GROUP(sb),
1949 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1950 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1951
7abc52c2 1952 cleancache_init_fs(sb);
ac27a0ec
DK		 1953 return res;
1954}
1955
772cb7c8
JS		 1956static int ext4_fill_flex_info(struct super_block *sb)
1957{
1958 struct ext4_sb_info *sbi = EXT4_SB(sb);
1959 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1960 ext4_group_t flex_group_count;
1961 ext4_group_t flex_group;
1962 int groups_per_flex = 0;
c5ca7c76 1963 size_t size;
772cb7c8
JS		 1964 int i;
1965
503358ae
TT		 1966 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1967 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1968
1969 if (groups_per_flex < 2) {
772cb7c8
JS		 1970 sbi->s_log_groups_per_flex = 0;
1971 return 1;
1972 }
1973
c62a11fd
FB		 1974 /* We allocate both existing and potentially added groups */
1975 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1976 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1977 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1978 size = flex_group_count * sizeof(struct flex_groups);
1979 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1980 if (sbi->s_flex_groups == NULL) {
94de56ab
JP		 1981 sbi->s_flex_groups = vzalloc(size);
1982 if (sbi->s_flex_groups == NULL) {
1983 ext4_msg(sb, KERN_ERR,
1984 "not enough memory for %u flex groups",
1985 flex_group_count);
1986 goto failed;
1987 }
772cb7c8 1988 }
772cb7c8 1989
772cb7c8 1990 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1991 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1992
1993 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1994 atomic_add(ext4_free_inodes_count(sb, gdp),
1995 &sbi->s_flex_groups[flex_group].free_inodes);
1996 atomic_add(ext4_free_blks_count(sb, gdp),
1997 &sbi->s_flex_groups[flex_group].free_blocks);
1998 atomic_add(ext4_used_dirs_count(sb, gdp),
1999 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2000 }
2001
2002 return 1;
2003failed:
2004 return 0;
2005}
2006
717d50e4
AD		 2007__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2008 struct ext4_group_desc *gdp)
2009{
2010 __u16 crc = 0;
2011
2012 if (sbi->s_es->s_feature_ro_compat &
2013 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
2014 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2015 __le32 le_group = cpu_to_le32(block_group);
2016
2017 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2018 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2019 crc = crc16(crc, (__u8 *)gdp, offset);
2020 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2021 /* for checksum of struct ext4_group_desc do the rest...*/
2022 if ((sbi->s_es->s_feature_incompat &
2023 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2024 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2025 crc = crc16(crc, (__u8 *)gdp + offset,
2026 le16_to_cpu(sbi->s_es->s_desc_size) -
2027 offset);
2028 }
2029
2030 return cpu_to_le16(crc);
2031}
2032
2033int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
2034 struct ext4_group_desc *gdp)
2035{
2036 if ((sbi->s_es->s_feature_ro_compat &
2037 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
2038 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
2039 return 0;
2040
2041 return 1;
2042}
2043
ac27a0ec 2044/* Called at mount-time, super-block is locked */
bfff6873
LC		 2045static int ext4_check_descriptors(struct super_block *sb,
2046 ext4_group_t *first_not_zeroed)
ac27a0ec 2047{
617ba13b
MC		 2048 struct ext4_sb_info *sbi = EXT4_SB(sb);
2049 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2050 ext4_fsblk_t last_block;
bd81d8ee
LV		 2051 ext4_fsblk_t block_bitmap;
2052 ext4_fsblk_t inode_bitmap;
2053 ext4_fsblk_t inode_table;
ce421581 2054 int flexbg_flag = 0;
bfff6873 2055 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2056
ce421581
JS		 2057 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2058 flexbg_flag = 1;
2059
af5bc92d 2060 ext4_debug("Checking group descriptors");
ac27a0ec 2061
197cd65a
AM		 2062 for (i = 0; i < sbi->s_groups_count; i++) {
2063 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2064
ce421581 2065 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2066 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2067 else
2068 last_block = first_block +
617ba13b 2069 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2070
bfff6873
LC		 2071 if ((grp == sbi->s_groups_count) &&
2072 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2073 grp = i;
2074
8fadc143 2075 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2076 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2077 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2078 "Block bitmap for group %u not in group "
b31e1552 2079 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2080 return 0;
2081 }
8fadc143 2082 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2083 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2084 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2085 "Inode bitmap for group %u not in group "
b31e1552 2086 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2087 return 0;
2088 }
8fadc143 2089 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2090 if (inode_table < first_block ||
2b2d6d01 2091 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2092 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2093 "Inode table for group %u not in group "
b31e1552 2094 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2095 return 0;
2096 }
955ce5f5 2097 ext4_lock_group(sb, i);
717d50e4 2098 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2099 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2100 "Checksum for group %u failed (%u!=%u)",
2101 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2102 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2103 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2104 ext4_unlock_group(sb, i);
8a266467 2105 return 0;
7ee1ec4c 2106 }
717d50e4 2107 }
955ce5f5 2108 ext4_unlock_group(sb, i);
ce421581
JS		 2109 if (!flexbg_flag)
2110 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2111 }
bfff6873
LC		 2112 if (NULL != first_not_zeroed)
2113 *first_not_zeroed = grp;
ac27a0ec 2114
bd81d8ee 2115 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 2116 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2117 return 1;
2118}
2119
617ba13b 2120/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2121 * the superblock) which were deleted from all directories, but held open by
2122 * a process at the time of a crash. We walk the list and try to delete these
2123 * inodes at recovery time (only with a read-write filesystem).
2124 *
2125 * In order to keep the orphan inode chain consistent during traversal (in
2126 * case of crash during recovery), we link each inode into the superblock
2127 * orphan list_head and handle it the same way as an inode deletion during
2128 * normal operation (which journals the operations for us).
2129 *
2130 * We only do an iget() and an iput() on each inode, which is very safe if we
2131 * accidentally point at an in-use or already deleted inode. The worst that
2132 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2133 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2134 * e2fsck was run on this filesystem, and it must have already done the orphan
2135 * inode cleanup for us, so we can safely abort without any further action.
2136 */
2b2d6d01
TT		 2137static void ext4_orphan_cleanup(struct super_block *sb,
2138 struct ext4_super_block *es)
ac27a0ec
DK		 2139{
2140 unsigned int s_flags = sb->s_flags;
2141 int nr_orphans = 0, nr_truncates = 0;
2142#ifdef CONFIG_QUOTA
2143 int i;
2144#endif
2145 if (!es->s_last_orphan) {
2146 jbd_debug(4, "no orphan inodes to clean up\n");
2147 return;
2148 }
2149
a8f48a95 2150 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2151 ext4_msg(sb, KERN_ERR, "write access "
2152 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2153 return;
2154 }
2155
d39195c3
AG		 2156 /* Check if feature set would not allow a r/w mount */
2157 if (!ext4_feature_set_ok(sb, 0)) {
2158 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2159 "unknown ROCOMPAT features");
2160 return;
2161 }
2162
617ba13b 2163 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2164 if (es->s_last_orphan)
2165 jbd_debug(1, "Errors on filesystem, "
2166 "clearing orphan list.\n");
2167 es->s_last_orphan = 0;
2168 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2169 return;
2170 }
2171
2172 if (s_flags & MS_RDONLY) {
b31e1552 2173 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2174 sb->s_flags &= ~MS_RDONLY;
2175 }
2176#ifdef CONFIG_QUOTA
2177 /* Needed for iput() to work correctly and not trash data */
2178 sb->s_flags |= MS_ACTIVE;
2179 /* Turn on quotas so that they are updated correctly */
2180 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2181 if (EXT4_SB(sb)->s_qf_names[i]) {
2182 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2183 if (ret < 0)
b31e1552
ES		 2184 ext4_msg(sb, KERN_ERR,
2185 "Cannot turn on journaled "
2186 "quota: error %d", ret);
ac27a0ec
DK		 2187 }
2188 }
2189#endif
2190
2191 while (es->s_last_orphan) {
2192 struct inode *inode;
2193
97bd42b9
JB		 2194 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2195 if (IS_ERR(inode)) {
ac27a0ec
DK		 2196 es->s_last_orphan = 0;
2197 break;
2198 }
2199
617ba13b 2200 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2201 dquot_initialize(inode);
ac27a0ec 2202 if (inode->i_nlink) {
b31e1552
ES		 2203 ext4_msg(sb, KERN_DEBUG,
2204 "%s: truncating inode %lu to %lld bytes",
46e665e9 2205 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2206 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2207 inode->i_ino, inode->i_size);
617ba13b 2208 ext4_truncate(inode);
ac27a0ec
DK		 2209 nr_truncates++;
2210 } else {
b31e1552
ES		 2211 ext4_msg(sb, KERN_DEBUG,
2212 "%s: deleting unreferenced inode %lu",
46e665e9 2213 __func__, inode->i_ino);
ac27a0ec
DK		 2214 jbd_debug(2, "deleting unreferenced inode %lu\n",
2215 inode->i_ino);
2216 nr_orphans++;
2217 }
2218 iput(inode); /* The delete magic happens here! */
2219 }
2220
2b2d6d01 2221#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2222
2223 if (nr_orphans)
b31e1552
ES		 2224 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2225 PLURAL(nr_orphans));
ac27a0ec 2226 if (nr_truncates)
b31e1552
ES		 2227 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2228 PLURAL(nr_truncates));
ac27a0ec
DK		 2229#ifdef CONFIG_QUOTA
2230 /* Turn quotas off */
2231 for (i = 0; i < MAXQUOTAS; i++) {
2232 if (sb_dqopt(sb)->files[i])
287a8095 2233 dquot_quota_off(sb, i);
ac27a0ec
DK		 2234 }
2235#endif
2236 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2237}
0b8e58a1 2238
cd2291a4
ES		 2239/*
2240 * Maximal extent format file size.
2241 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2242 * extent format containers, within a sector_t, and within i_blocks
2243 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2244 * so that won't be a limiting factor.
2245 *
2246 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2247 */
f287a1a5 2248static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2249{
2250 loff_t res;
2251 loff_t upper_limit = MAX_LFS_FILESIZE;
2252
2253 /* small i_blocks in vfs inode? */
f287a1a5 2254 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2255 /*
90c699a9 2256 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2257 * i_block represent total blocks in 512 bytes
2258 * 32 == size of vfs inode i_blocks * 8
2259 */
2260 upper_limit = (1LL << 32) - 1;
2261
2262 /* total blocks in file system block size */
2263 upper_limit >>= (blkbits - 9);
2264 upper_limit <<= blkbits;
2265 }
2266
2267 /* 32-bit extent-start container, ee_block */
2268 res = 1LL << 32;
2269 res <<= blkbits;
2270 res -= 1;
2271
2272 /* Sanity check against vm- & vfs- imposed limits */
2273 if (res > upper_limit)
2274 res = upper_limit;
2275
2276 return res;
2277}
ac27a0ec 2278
ac27a0ec 2279/*
cd2291a4 2280 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2281 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2282 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2283 */
f287a1a5 2284static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2285{
617ba13b 2286 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2287 int meta_blocks;
2288 loff_t upper_limit;
0b8e58a1
AD		 2289 /* This is calculated to be the largest file size for a dense, block
2290 * mapped file such that the file's total number of 512-byte sectors,
2291 * including data and all indirect blocks, does not exceed (2^48 - 1).
2292 *
2293 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2294 * number of 512-byte sectors of the file.
0fc1b451
AK		 2295 */
2296
f287a1a5 2297 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2298 /*
90c699a9 2299 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2300 * the inode i_block field represents total file blocks in
2301 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2302 */
2303 upper_limit = (1LL << 32) - 1;
2304
2305 /* total blocks in file system block size */
2306 upper_limit >>= (bits - 9);
2307
2308 } else {
8180a562
AK		 2309 /*
2310 * We use 48 bit ext4_inode i_blocks
2311 * With EXT4_HUGE_FILE_FL set the i_blocks
2312 * represent total number of blocks in
2313 * file system block size
2314 */
0fc1b451
AK		 2315 upper_limit = (1LL << 48) - 1;
2316
0fc1b451
AK		 2317 }
2318
2319 /* indirect blocks */
2320 meta_blocks = 1;
2321 /* double indirect blocks */
2322 meta_blocks += 1 + (1LL << (bits-2));
2323 /* tripple indirect blocks */
2324 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2325
2326 upper_limit -= meta_blocks;
2327 upper_limit <<= bits;
ac27a0ec
DK		 2328
2329 res += 1LL << (bits-2);
2330 res += 1LL << (2*(bits-2));
2331 res += 1LL << (3*(bits-2));
2332 res <<= bits;
2333 if (res > upper_limit)
2334 res = upper_limit;
0fc1b451
AK		 2335
2336 if (res > MAX_LFS_FILESIZE)
2337 res = MAX_LFS_FILESIZE;
2338
ac27a0ec
DK		 2339 return res;
2340}
2341
617ba13b 2342static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2343 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2344{
617ba13b 2345 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2346 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2347 int has_super = 0;
2348
2349 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2350
617ba13b 2351 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2352 nr < first_meta_bg)
70bbb3e0 2353 return logical_sb_block + nr + 1;
ac27a0ec 2354 bg = sbi->s_desc_per_block * nr;
617ba13b 2355 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2356 has_super = 1;
0b8e58a1 2357
617ba13b 2358 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2359}
2360
c9de560d
AT		 2361/**
2362 * ext4_get_stripe_size: Get the stripe size.
2363 * @sbi: In memory super block info
2364 *
2365 * If we have specified it via mount option, then
2366 * use the mount option value. If the value specified at mount time is
2367 * greater than the blocks per group use the super block value.
2368 * If the super block value is greater than blocks per group return 0.
2369 * Allocator needs it be less than blocks per group.
2370 *
2371 */
2372static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2373{
2374 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2375 unsigned long stripe_width =
2376 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2377
2378 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2379 return sbi->s_stripe;
2380
2381 if (stripe_width <= sbi->s_blocks_per_group)
2382 return stripe_width;
2383
2384 if (stride <= sbi->s_blocks_per_group)
2385 return stride;
2386
2387 return 0;
2388}
ac27a0ec 2389
3197ebdb
TT		 2390/* sysfs supprt */
2391
2392struct ext4_attr {
2393 struct attribute attr;
2394 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2395 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2396 const char *, size_t);
2397 int offset;
2398};
2399
2400static int parse_strtoul(const char *buf,
2401 unsigned long max, unsigned long *value)
2402{
2403 char *endp;
2404
e7d2860b
AGR		 2405 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2406 endp = skip_spaces(endp);
3197ebdb
TT		 2407 if (*endp || *value > max)
2408 return -EINVAL;
2409
2410 return 0;
2411}
2412
2413static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2414 struct ext4_sb_info *sbi,
2415 char *buf)
2416{
2417 return snprintf(buf, PAGE_SIZE, "%llu\n",
2418 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2419}
2420
2421static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2422 struct ext4_sb_info *sbi, char *buf)
2423{
2424 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2425
f613dfcb
TT		 2426 if (!sb->s_bdev->bd_part)
2427 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2428 return snprintf(buf, PAGE_SIZE, "%lu\n",
2429 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2430 sbi->s_sectors_written_start) >> 1);
2431}
2432
2433static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2434 struct ext4_sb_info *sbi, char *buf)
2435{
2436 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2437
f613dfcb
TT		 2438 if (!sb->s_bdev->bd_part)
2439 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2440 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2441 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2442 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2443 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2444}
2445
77f4135f
VH		 2446static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2447 struct ext4_sb_info *sbi, char *buf)
2448{
2449 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2450}
2451
2452static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2453 struct ext4_sb_info *sbi, char *buf)
2454{
2455 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2456}
2457
3197ebdb
TT		 2458static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2459 struct ext4_sb_info *sbi,
2460 const char *buf, size_t count)
2461{
2462 unsigned long t;
2463
2464 if (parse_strtoul(buf, 0x40000000, &t))
2465 return -EINVAL;
2466
5dbd571d 2467 if (t && !is_power_of_2(t))
3197ebdb
TT		 2468 return -EINVAL;
2469
2470 sbi->s_inode_readahead_blks = t;
2471 return count;
2472}
2473
2474static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2475 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2476{
2477 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2478
2479 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2480}
2481
2482static ssize_t sbi_ui_store(struct ext4_attr *a,
2483 struct ext4_sb_info *sbi,
2484 const char *buf, size_t count)
2485{
2486 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2487 unsigned long t;
2488
2489 if (parse_strtoul(buf, 0xffffffff, &t))
2490 return -EINVAL;
2491 *ui = t;
2492 return count;
2493}
2494
2495#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2496static struct ext4_attr ext4_attr_##_name = { \
2497 .attr = {.name = __stringify(_name), .mode = _mode }, \
2498 .show = _show, \
2499 .store = _store, \
2500 .offset = offsetof(struct ext4_sb_info, _elname), \
2501}
2502#define EXT4_ATTR(name, mode, show, store) \
2503static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2504
857ac889 2505#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2506#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2507#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2508#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2509 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2510#define ATTR_LIST(name) &ext4_attr_##name.attr
2511
2512EXT4_RO_ATTR(delayed_allocation_blocks);
2513EXT4_RO_ATTR(session_write_kbytes);
2514EXT4_RO_ATTR(lifetime_write_kbytes);
77f4135f
VH		 2515EXT4_RO_ATTR(extent_cache_hits);
2516EXT4_RO_ATTR(extent_cache_misses);
3197ebdb
TT		 2517EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2518 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2519EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2520EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2521EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2522EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2523EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2524EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2525EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2526EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2527
2528static struct attribute *ext4_attrs[] = {
2529 ATTR_LIST(delayed_allocation_blocks),
2530 ATTR_LIST(session_write_kbytes),
2531 ATTR_LIST(lifetime_write_kbytes),
77f4135f
VH		 2532 ATTR_LIST(extent_cache_hits),
2533 ATTR_LIST(extent_cache_misses),
3197ebdb 2534 ATTR_LIST(inode_readahead_blks),
11013911 2535 ATTR_LIST(inode_goal),
3197ebdb
TT		 2536 ATTR_LIST(mb_stats),
2537 ATTR_LIST(mb_max_to_scan),
2538 ATTR_LIST(mb_min_to_scan),
2539 ATTR_LIST(mb_order2_req),
2540 ATTR_LIST(mb_stream_req),
2541 ATTR_LIST(mb_group_prealloc),
55138e0b 2542 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2543 NULL,
2544};
2545
857ac889
LC		 2546/* Features this copy of ext4 supports */
2547EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2548EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2549
2550static struct attribute *ext4_feat_attrs[] = {
2551 ATTR_LIST(lazy_itable_init),
27ee40df 2552 ATTR_LIST(batched_discard),
857ac889
LC		 2553 NULL,
2554};
2555
3197ebdb
TT		 2556static ssize_t ext4_attr_show(struct kobject *kobj,
2557 struct attribute *attr, char *buf)
2558{
2559 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2560 s_kobj);
2561 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2562
2563 return a->show ? a->show(a, sbi, buf) : 0;
2564}
2565
2566static ssize_t ext4_attr_store(struct kobject *kobj,
2567 struct attribute *attr,
2568 const char *buf, size_t len)
2569{
2570 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2571 s_kobj);
2572 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2573
2574 return a->store ? a->store(a, sbi, buf, len) : 0;
2575}
2576
2577static void ext4_sb_release(struct kobject *kobj)
2578{
2579 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2580 s_kobj);
2581 complete(&sbi->s_kobj_unregister);
2582}
2583
52cf25d0 2584static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2585 .show = ext4_attr_show,
2586 .store = ext4_attr_store,
2587};
2588
2589static struct kobj_type ext4_ktype = {
2590 .default_attrs = ext4_attrs,
2591 .sysfs_ops = &ext4_attr_ops,
2592 .release = ext4_sb_release,
2593};
2594
857ac889
LC		 2595static void ext4_feat_release(struct kobject *kobj)
2596{
2597 complete(&ext4_feat->f_kobj_unregister);
2598}
2599
2600static struct kobj_type ext4_feat_ktype = {
2601 .default_attrs = ext4_feat_attrs,
2602 .sysfs_ops = &ext4_attr_ops,
2603 .release = ext4_feat_release,
2604};
2605
a13fb1a4
ES		 2606/*
2607 * Check whether this filesystem can be mounted based on
2608 * the features present and the RDONLY/RDWR mount requested.
2609 * Returns 1 if this filesystem can be mounted as requested,
2610 * 0 if it cannot be.
2611 */
2612static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2613{
2614 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2615 ext4_msg(sb, KERN_ERR,
2616 "Couldn't mount because of "
2617 "unsupported optional features (%x)",
2618 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2619 ~EXT4_FEATURE_INCOMPAT_SUPP));
2620 return 0;
2621 }
2622
2623 if (readonly)
2624 return 1;
2625
2626 /* Check that feature set is OK for a read-write mount */
2627 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2628 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2629 "unsupported optional features (%x)",
2630 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2631 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2632 return 0;
2633 }
2634 /*
2635 * Large file size enabled file system can only be mounted
2636 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2637 */
2638 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2639 if (sizeof(blkcnt_t) < sizeof(u64)) {
2640 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2641 "cannot be mounted RDWR without "
2642 "CONFIG_LBDAF");
2643 return 0;
2644 }
2645 }
2646 return 1;
2647}
2648
66e61a9e
TT		 2649/*
2650 * This function is called once a day if we have errors logged
2651 * on the file system
2652 */
2653static void print_daily_error_info(unsigned long arg)
2654{
2655 struct super_block *sb = (struct super_block *) arg;
2656 struct ext4_sb_info *sbi;
2657 struct ext4_super_block *es;
2658
2659 sbi = EXT4_SB(sb);
2660 es = sbi->s_es;
2661
2662 if (es->s_error_count)
2663 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2664 le32_to_cpu(es->s_error_count));
2665 if (es->s_first_error_time) {
2666 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2667 sb->s_id, le32_to_cpu(es->s_first_error_time),
2668 (int) sizeof(es->s_first_error_func),
2669 es->s_first_error_func,
2670 le32_to_cpu(es->s_first_error_line));
2671 if (es->s_first_error_ino)
2672 printk(": inode %u",
2673 le32_to_cpu(es->s_first_error_ino));
2674 if (es->s_first_error_block)
2675 printk(": block %llu", (unsigned long long)
2676 le64_to_cpu(es->s_first_error_block));
2677 printk("\n");
2678 }
2679 if (es->s_last_error_time) {
2680 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2681 sb->s_id, le32_to_cpu(es->s_last_error_time),
2682 (int) sizeof(es->s_last_error_func),
2683 es->s_last_error_func,
2684 le32_to_cpu(es->s_last_error_line));
2685 if (es->s_last_error_ino)
2686 printk(": inode %u",
2687 le32_to_cpu(es->s_last_error_ino));
2688 if (es->s_last_error_block)
2689 printk(": block %llu", (unsigned long long)
2690 le64_to_cpu(es->s_last_error_block));
2691 printk("\n");
2692 }
2693 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2694}
2695
bfff6873
LC		 2696/* Find next suitable group and run ext4_init_inode_table */
2697static int ext4_run_li_request(struct ext4_li_request *elr)
2698{
2699 struct ext4_group_desc *gdp = NULL;
2700 ext4_group_t group, ngroups;
2701 struct super_block *sb;
2702 unsigned long timeout = 0;
2703 int ret = 0;
2704
2705 sb = elr->lr_super;
2706 ngroups = EXT4_SB(sb)->s_groups_count;
2707
2708 for (group = elr->lr_next_group; group < ngroups; group++) {
2709 gdp = ext4_get_group_desc(sb, group, NULL);
2710 if (!gdp) {
2711 ret = 1;
2712 break;
2713 }
2714
2715 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2716 break;
2717 }
2718
2719 if (group == ngroups)
2720 ret = 1;
2721
2722 if (!ret) {
2723 timeout = jiffies;
2724 ret = ext4_init_inode_table(sb, group,
2725 elr->lr_timeout ? 0 : 1);
2726 if (elr->lr_timeout == 0) {
51ce6511
LC		 2727 timeout = (jiffies - timeout) *
2728 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2729 elr->lr_timeout = timeout;
2730 }
2731 elr->lr_next_sched = jiffies + elr->lr_timeout;
2732 elr->lr_next_group = group + 1;
2733 }
2734
2735 return ret;
2736}
2737
2738/*
2739 * Remove lr_request from the list_request and free the
4ed5c033 2740 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2741 */
2742static void ext4_remove_li_request(struct ext4_li_request *elr)
2743{
2744 struct ext4_sb_info *sbi;
2745
2746 if (!elr)
2747 return;
2748
2749 sbi = elr->lr_sbi;
2750
2751 list_del(&elr->lr_request);
2752 sbi->s_li_request = NULL;
2753 kfree(elr);
2754}
2755
2756static void ext4_unregister_li_request(struct super_block *sb)
2757{
1bb933fb
LC		 2758 mutex_lock(&ext4_li_mtx);
2759 if (!ext4_li_info) {
2760 mutex_unlock(&ext4_li_mtx);
bfff6873 2761 return;
1bb933fb 2762 }
bfff6873
LC		 2763
2764 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2765 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2766 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2767 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2768}
2769
8f1f7453
ES		 2770static struct task_struct *ext4_lazyinit_task;
2771
bfff6873
LC		 2772/*
2773 * This is the function where ext4lazyinit thread lives. It walks
2774 * through the request list searching for next scheduled filesystem.
2775 * When such a fs is found, run the lazy initialization request
2776 * (ext4_rn_li_request) and keep track of the time spend in this
2777 * function. Based on that time we compute next schedule time of
2778 * the request. When walking through the list is complete, compute
2779 * next waking time and put itself into sleep.
2780 */
2781static int ext4_lazyinit_thread(void *arg)
2782{
2783 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2784 struct list_head *pos, *n;
2785 struct ext4_li_request *elr;
4ed5c033 2786 unsigned long next_wakeup, cur;
bfff6873
LC		 2787
2788 BUG_ON(NULL == eli);
2789
bfff6873
LC		 2790cont_thread:
2791 while (true) {
2792 next_wakeup = MAX_JIFFY_OFFSET;
2793
2794 mutex_lock(&eli->li_list_mtx);
2795 if (list_empty(&eli->li_request_list)) {
2796 mutex_unlock(&eli->li_list_mtx);
2797 goto exit_thread;
2798 }
2799
2800 list_for_each_safe(pos, n, &eli->li_request_list) {
2801 elr = list_entry(pos, struct ext4_li_request,
2802 lr_request);
2803
b2c78cd0
TT		 2804 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2805 if (ext4_run_li_request(elr) != 0) {
2806 /* error, remove the lazy_init job */
2807 ext4_remove_li_request(elr);
2808 continue;
2809 }
bfff6873
LC		 2810 }
2811
2812 if (time_before(elr->lr_next_sched, next_wakeup))
2813 next_wakeup = elr->lr_next_sched;
2814 }
2815 mutex_unlock(&eli->li_list_mtx);
2816
2817 if (freezing(current))
2818 refrigerator();
2819
4ed5c033
LC		 2820 cur = jiffies;
2821 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2822 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2823 cond_resched();
2824 continue;
2825 }
2826
4ed5c033
LC		 2827 schedule_timeout_interruptible(next_wakeup - cur);
2828
8f1f7453
ES		 2829 if (kthread_should_stop()) {
2830 ext4_clear_request_list();
2831 goto exit_thread;
2832 }
bfff6873
LC		 2833 }
2834
2835exit_thread:
2836 /*
2837 * It looks like the request list is empty, but we need
2838 * to check it under the li_list_mtx lock, to prevent any
2839 * additions into it, and of course we should lock ext4_li_mtx
2840 * to atomically free the list and ext4_li_info, because at
2841 * this point another ext4 filesystem could be registering
2842 * new one.
2843 */
2844 mutex_lock(&ext4_li_mtx);
2845 mutex_lock(&eli->li_list_mtx);
2846 if (!list_empty(&eli->li_request_list)) {
2847 mutex_unlock(&eli->li_list_mtx);
2848 mutex_unlock(&ext4_li_mtx);
2849 goto cont_thread;
2850 }
2851 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2852 kfree(ext4_li_info);
2853 ext4_li_info = NULL;
2854 mutex_unlock(&ext4_li_mtx);
2855
2856 return 0;
2857}
2858
2859static void ext4_clear_request_list(void)
2860{
2861 struct list_head *pos, *n;
2862 struct ext4_li_request *elr;
2863
2864 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2865 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2866 elr = list_entry(pos, struct ext4_li_request,
2867 lr_request);
2868 ext4_remove_li_request(elr);
2869 }
2870 mutex_unlock(&ext4_li_info->li_list_mtx);
2871}
2872
2873static int ext4_run_lazyinit_thread(void)
2874{
8f1f7453
ES		 2875 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2876 ext4_li_info, "ext4lazyinit");
2877 if (IS_ERR(ext4_lazyinit_task)) {
2878 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2879 ext4_clear_request_list();
bfff6873
LC		 2880 kfree(ext4_li_info);
2881 ext4_li_info = NULL;
2882 printk(KERN_CRIT "EXT4: error %d creating inode table "
2883 "initialization thread\n",
2884 err);
2885 return err;
2886 }
2887 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2888 return 0;
2889}
2890
2891/*
2892 * Check whether it make sense to run itable init. thread or not.
2893 * If there is at least one uninitialized inode table, return
2894 * corresponding group number, else the loop goes through all
2895 * groups and return total number of groups.
2896 */
2897static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2898{
2899 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2900 struct ext4_group_desc *gdp = NULL;
2901
2902 for (group = 0; group < ngroups; group++) {
2903 gdp = ext4_get_group_desc(sb, group, NULL);
2904 if (!gdp)
2905 continue;
2906
2907 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2908 break;
2909 }
2910
2911 return group;
2912}
2913
2914static int ext4_li_info_new(void)
2915{
2916 struct ext4_lazy_init *eli = NULL;
2917
2918 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2919 if (!eli)
2920 return -ENOMEM;
2921
bfff6873
LC		 2922 INIT_LIST_HEAD(&eli->li_request_list);
2923 mutex_init(&eli->li_list_mtx);
2924
bfff6873
LC		 2925 eli->li_state |= EXT4_LAZYINIT_QUIT;
2926
2927 ext4_li_info = eli;
2928
2929 return 0;
2930}
2931
2932static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2933 ext4_group_t start)
2934{
2935 struct ext4_sb_info *sbi = EXT4_SB(sb);
2936 struct ext4_li_request *elr;
2937 unsigned long rnd;
2938
2939 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2940 if (!elr)
2941 return NULL;
2942
2943 elr->lr_super = sb;
2944 elr->lr_sbi = sbi;
2945 elr->lr_next_group = start;
2946
2947 /*
2948 * Randomize first schedule time of the request to
2949 * spread the inode table initialization requests
2950 * better.
2951 */
2952 get_random_bytes(&rnd, sizeof(rnd));
2953 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2954 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2955
2956 return elr;
2957}
2958
2959static int ext4_register_li_request(struct super_block *sb,
2960 ext4_group_t first_not_zeroed)
2961{
2962 struct ext4_sb_info *sbi = EXT4_SB(sb);
2963 struct ext4_li_request *elr;
2964 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2965 int ret = 0;
bfff6873 2966
51ce6511
LC		 2967 if (sbi->s_li_request != NULL) {
2968 /*
2969 * Reset timeout so it can be computed again, because
2970 * s_li_wait_mult might have changed.
2971 */
2972 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2973 return 0;
51ce6511 2974 }
bfff6873
LC		 2975
2976 if (first_not_zeroed == ngroups ||
2977 (sb->s_flags & MS_RDONLY) ||
55ff3840 2978 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 2979 return 0;
bfff6873
LC		 2980
2981 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 2982 if (!elr)
2983 return -ENOMEM;
bfff6873
LC		 2984
2985 mutex_lock(&ext4_li_mtx);
2986
2987 if (NULL == ext4_li_info) {
2988 ret = ext4_li_info_new();
2989 if (ret)
2990 goto out;
2991 }
2992
2993 mutex_lock(&ext4_li_info->li_list_mtx);
2994 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2995 mutex_unlock(&ext4_li_info->li_list_mtx);
2996
2997 sbi->s_li_request = elr;
46e4690b
TM		 2998 /*
2999 * set elr to NULL here since it has been inserted to
3000 * the request_list and the removal and free of it is
3001 * handled by ext4_clear_request_list from now on.
3002 */
3003 elr = NULL;
bfff6873
LC		 3004
3005 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3006 ret = ext4_run_lazyinit_thread();
3007 if (ret)
3008 goto out;
3009 }
bfff6873 3010out:
beed5ecb
NK		 3011 mutex_unlock(&ext4_li_mtx);
3012 if (ret)
bfff6873 3013 kfree(elr);
bfff6873
LC		 3014 return ret;
3015}
3016
3017/*
3018 * We do not need to lock anything since this is called on
3019 * module unload.
3020 */
3021static void ext4_destroy_lazyinit_thread(void)
3022{
3023 /*
3024 * If thread exited earlier
3025 * there's nothing to be done.
3026 */
8f1f7453 3027 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3028 return;
3029
8f1f7453 3030 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3031}
3032
2b2d6d01 3033static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 3034 __releases(kernel_lock)
3035 __acquires(kernel_lock)
ac27a0ec 3036{
d4c402d9 3037 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3038 struct buffer_head *bh;
617ba13b
MC		 3039 struct ext4_super_block *es = NULL;
3040 struct ext4_sb_info *sbi;
3041 ext4_fsblk_t block;
3042 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3043 ext4_fsblk_t logical_sb_block;
ac27a0ec 3044 unsigned long offset = 0;
ac27a0ec
DK		 3045 unsigned long journal_devnum = 0;
3046 unsigned long def_mount_opts;
3047 struct inode *root;
9f6200bb 3048 char *cp;
0390131b 3049 const char *descr;
dcc7dae3 3050 int ret = -ENOMEM;
ac27a0ec 3051 int blocksize;
4ec11028
TT		 3052 unsigned int db_count;
3053 unsigned int i;
f287a1a5 3054 int needs_recovery, has_huge_files;
bd81d8ee 3055 __u64 blocks_count;
833f4077 3056 int err;
b3881f74 3057 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3058 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3059
3060 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3061 if (!sbi)
dcc7dae3 3062 goto out_free_orig;
705895b6
PE		 3063
3064 sbi->s_blockgroup_lock =
3065 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3066 if (!sbi->s_blockgroup_lock) {
3067 kfree(sbi);
dcc7dae3 3068 goto out_free_orig;
705895b6 3069 }
ac27a0ec
DK		 3070 sb->s_fs_info = sbi;
3071 sbi->s_mount_opt = 0;
617ba13b
MC		 3072 sbi->s_resuid = EXT4_DEF_RESUID;
3073 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 3074 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3075 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3076 if (sb->s_bdev->bd_part)
3077 sbi->s_sectors_written_start =
3078 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3079
9f6200bb
TT		 3080 /* Cleanup superblock name */
3081 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3082 *cp = '!';
3083
dcc7dae3 3084 ret = -EINVAL;
617ba13b 3085 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3086 if (!blocksize) {
b31e1552 3087 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3088 goto out_fail;
3089 }
3090
3091 /*
617ba13b 3092 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3093 * block sizes. We need to calculate the offset from buffer start.
3094 */
617ba13b 3095 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3096 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3097 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3098 } else {
70bbb3e0 3099 logical_sb_block = sb_block;
ac27a0ec
DK		 3100 }
3101
70bbb3e0 3102 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3103 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3104 goto out_fail;
3105 }
3106 /*
3107 * Note: s_es must be initialized as soon as possible because
617ba13b 3108 * some ext4 macro-instructions depend on its value
ac27a0ec 3109 */
617ba13b 3110 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3111 sbi->s_es = es;
3112 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3113 if (sb->s_magic != EXT4_SUPER_MAGIC)
3114 goto cantfind_ext4;
afc32f7e 3115 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3116
3117 /* Set defaults before we parse the mount options */
3118 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3119 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3120 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3121 set_opt(sb, DEBUG);
437ca0fd
DM		 3122 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3123 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3124 "2.6.38");
fd8c37ec 3125 set_opt(sb, GRPID);
437ca0fd 3126 }
617ba13b 3127 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3128 set_opt(sb, NO_UID32);
ea663336 3129 /* xattr user namespace & acls are now defaulted on */
03010a33 3130#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3131 set_opt(sb, XATTR_USER);
2e7842b8 3132#endif
03010a33 3133#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3134 set_opt(sb, POSIX_ACL);
2e7842b8 3135#endif
6fd7a467 3136 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3137 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3138 set_opt(sb, JOURNAL_DATA);
617ba13b 3139 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3140 set_opt(sb, ORDERED_DATA);
617ba13b 3141 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3142 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3143
3144 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3145 set_opt(sb, ERRORS_PANIC);
bb4f397a 3146 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3147 set_opt(sb, ERRORS_CONT);
bb4f397a 3148 else
fd8c37ec 3149 set_opt(sb, ERRORS_RO);
8b67f04a 3150 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3151 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3152 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3153 set_opt(sb, DISCARD);
ac27a0ec
DK		 3154
3155 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3156 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3157 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3158 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3159 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3160
8b67f04a 3161 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3162 set_opt(sb, BARRIER);
ac27a0ec 3163
dd919b98
AK		 3164 /*
3165 * enable delayed allocation by default
3166 * Use -o nodelalloc to turn it off
3167 */
8b67f04a
TT		 3168 if (!IS_EXT3_SB(sb) &&
3169 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3170 set_opt(sb, DELALLOC);
dd919b98 3171
51ce6511
LC		 3172 /*
3173 * set default s_li_wait_mult for lazyinit, for the case there is
3174 * no mount option specified.
3175 */
3176 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3177
8b67f04a
TT		 3178 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3179 &journal_devnum, &journal_ioprio, NULL, 0)) {
3180 ext4_msg(sb, KERN_WARNING,
3181 "failed to parse options in superblock: %s",
3182 sbi->s_es->s_mount_opts);
3183 }
b3881f74
TT		 3184 if (!parse_options((char *) data, sb, &journal_devnum,
3185 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 3186 goto failed_mount;
3187
3188 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3189 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3190
617ba13b
MC		 3191 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3192 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3193 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3194 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3195 ext4_msg(sb, KERN_WARNING,
3196 "feature flags set on rev 0 fs, "
3197 "running e2fsck is recommended");
469108ff 3198
2035e776
TT		 3199 if (IS_EXT2_SB(sb)) {
3200 if (ext2_feature_set_ok(sb))
3201 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3202 "using the ext4 subsystem");
3203 else {
3204 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3205 "to feature incompatibilities");
3206 goto failed_mount;
3207 }
3208 }
3209
3210 if (IS_EXT3_SB(sb)) {
3211 if (ext3_feature_set_ok(sb))
3212 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3213 "using the ext4 subsystem");
3214 else {
3215 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3216 "to feature incompatibilities");
3217 goto failed_mount;
3218 }
3219 }
3220
ac27a0ec
DK		 3221 /*
3222 * Check feature flags regardless of the revision level, since we
3223 * previously didn't change the revision level when setting the flags,
3224 * so there is a chance incompat flags are set on a rev 0 filesystem.
3225 */
a13fb1a4 3226 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3227 goto failed_mount;
a13fb1a4 3228
ac27a0ec
DK		 3229 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3230
617ba13b
MC		 3231 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3232 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3233 ext4_msg(sb, KERN_ERR,
3234 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3235 goto failed_mount;
3236 }
3237
ac27a0ec 3238 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3239 /* Validate the filesystem blocksize */
3240 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3241 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3242 blocksize);
ac27a0ec
DK		 3243 goto failed_mount;
3244 }
3245
2b2d6d01 3246 brelse(bh);
70bbb3e0
AM		 3247 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3248 offset = do_div(logical_sb_block, blocksize);
3249 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3250 if (!bh) {
b31e1552
ES		 3251 ext4_msg(sb, KERN_ERR,
3252 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3253 goto failed_mount;
3254 }
617ba13b 3255 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3256 sbi->s_es = es;
617ba13b 3257 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3258 ext4_msg(sb, KERN_ERR,
3259 "Magic mismatch, very weird!");
ac27a0ec
DK		 3260 goto failed_mount;
3261 }
3262 }
3263
a13fb1a4
ES		 3264 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3265 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3266 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3267 has_huge_files);
3268 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3269
617ba13b
MC		 3270 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3271 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3272 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3273 } else {
3274 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3275 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3276 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3277 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3278 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3279 ext4_msg(sb, KERN_ERR,
3280 "unsupported inode size: %d",
2b2d6d01 3281 sbi->s_inode_size);
ac27a0ec
DK		 3282 goto failed_mount;
3283 }
ef7f3835
KS		 3284 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3285 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3286 }
0b8e58a1 3287
0d1ee42f
AR		 3288 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3289 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3290 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3291 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3292 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3293 ext4_msg(sb, KERN_ERR,
3294 "unsupported descriptor size %lu",
0d1ee42f
AR		 3295 sbi->s_desc_size);
3296 goto failed_mount;
3297 }
3298 } else
3299 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3300
ac27a0ec 3301 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3302 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3303 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3304 goto cantfind_ext4;
0b8e58a1 3305
617ba13b 3306 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3307 if (sbi->s_inodes_per_block == 0)
617ba13b 3308 goto cantfind_ext4;
ac27a0ec
DK		 3309 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3310 sbi->s_inodes_per_block;
0d1ee42f 3311 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3312 sbi->s_sbh = bh;
3313 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3314 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3315 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3316
2b2d6d01 3317 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3318 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3319 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3320 i = le32_to_cpu(es->s_flags);
3321 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3322 sbi->s_hash_unsigned = 3;
3323 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3324#ifdef __CHAR_UNSIGNED__
3325 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3326 sbi->s_hash_unsigned = 3;
3327#else
3328 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3329#endif
3330 sb->s_dirt = 1;
3331 }
ac27a0ec
DK		 3332
3333 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 3334 ext4_msg(sb, KERN_ERR,
3335 "#blocks per group too big: %lu",
2b2d6d01 3336 sbi->s_blocks_per_group);
ac27a0ec
DK		 3337 goto failed_mount;
3338 }
ac27a0ec 3339 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3340 ext4_msg(sb, KERN_ERR,
3341 "#inodes per group too big: %lu",
2b2d6d01 3342 sbi->s_inodes_per_group);
ac27a0ec
DK		 3343 goto failed_mount;
3344 }
3345
bf43d84b
ES		 3346 /*
3347 * Test whether we have more sectors than will fit in sector_t,
3348 * and whether the max offset is addressable by the page cache.
3349 */
5a9ae68a 3350 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3351 ext4_blocks_count(es));
5a9ae68a 3352 if (err) {
b31e1552 3353 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3354 " too large to mount safely on this system");
ac27a0ec 3355 if (sizeof(sector_t) < 8)
90c699a9 3356 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3357 ret = err;
ac27a0ec
DK		 3358 goto failed_mount;
3359 }
3360
617ba13b
MC		 3361 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3362 goto cantfind_ext4;
e7c95593 3363
0f2ddca6
FTN		 3364 /* check blocks count against device size */
3365 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3366 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3367 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3368 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3369 ext4_blocks_count(es), blocks_count);
3370 goto failed_mount;
3371 }
3372
0b8e58a1
AD		 3373 /*
3374 * It makes no sense for the first data block to be beyond the end
3375 * of the filesystem.
3376 */
3377 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 3378 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3379 "block %u is beyond end of filesystem (%llu)",
3380 le32_to_cpu(es->s_first_data_block),
3381 ext4_blocks_count(es));
e7c95593
ES		 3382 goto failed_mount;
3383 }
bd81d8ee
LV		 3384 blocks_count = (ext4_blocks_count(es) -
3385 le32_to_cpu(es->s_first_data_block) +
3386 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3387 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3388 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3389 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3390 "(block count %llu, first data block %u, "
b31e1552 3391 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3392 ext4_blocks_count(es),
3393 le32_to_cpu(es->s_first_data_block),
3394 EXT4_BLOCKS_PER_GROUP(sb));
3395 goto failed_mount;
3396 }
bd81d8ee 3397 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3398 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3399 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3400 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3401 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 3402 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 3403 GFP_KERNEL);
3404 if (sbi->s_group_desc == NULL) {
b31e1552 3405 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3406 goto failed_mount;
3407 }
3408
3244fcb1 3409#ifdef CONFIG_PROC_FS
9f6200bb
TT		 3410 if (ext4_proc_root)
3411 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 3412#endif
240799cd 3413
705895b6 3414 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3415
3416 for (i = 0; i < db_count; i++) {
70bbb3e0 3417 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3418 sbi->s_group_desc[i] = sb_bread(sb, block);
3419 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3420 ext4_msg(sb, KERN_ERR,
3421 "can't read group descriptor %d", i);
ac27a0ec
DK		 3422 db_count = i;
3423 goto failed_mount2;
3424 }
3425 }
bfff6873 3426 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3427 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3428 goto failed_mount2;
3429 }
772cb7c8
JS		 3430 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3431 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3432 ext4_msg(sb, KERN_ERR,
3433 "unable to initialize "
3434 "flex_bg meta info!");
772cb7c8
JS		 3435 goto failed_mount2;
3436 }
3437
ac27a0ec
DK		 3438 sbi->s_gdb_count = db_count;
3439 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3440 spin_lock_init(&sbi->s_next_gen_lock);
3441
04496411
TM		 3442 init_timer(&sbi->s_err_report);
3443 sbi->s_err_report.function = print_daily_error_info;
3444 sbi->s_err_report.data = (unsigned long) sb;
3445
ce7e010a
TT		 3446 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3447 ext4_count_free_blocks(sb));
3448 if (!err) {
3449 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3450 ext4_count_free_inodes(sb));
3451 }
3452 if (!err) {
3453 err = percpu_counter_init(&sbi->s_dirs_counter,
3454 ext4_count_dirs(sb));
3455 }
3456 if (!err) {
3457 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3458 }
3459 if (err) {
3460 ext4_msg(sb, KERN_ERR, "insufficient memory");
3461 goto failed_mount3;
3462 }
3463
c9de560d 3464 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3465 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3466
ac27a0ec
DK		 3467 /*
3468 * set up enough so that it can read an inode
3469 */
9ca92389
TT		 3470 if (!test_opt(sb, NOLOAD) &&
3471 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3472 sb->s_op = &ext4_sops;
3473 else
3474 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3475 sb->s_export_op = &ext4_export_ops;
3476 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3477#ifdef CONFIG_QUOTA
617ba13b
MC		 3478 sb->s_qcop = &ext4_qctl_operations;
3479 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3480#endif
f2fa2ffc
AK		 3481 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3482
ac27a0ec 3483 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3484 mutex_init(&sbi->s_orphan_lock);
32ed5058 3485 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 3486
3487 sb->s_root = NULL;
3488
3489 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3490 EXT4_HAS_INCOMPAT_FEATURE(sb,
3491 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3492
c5e06d10
JL		 3493 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3494 !(sb->s_flags & MS_RDONLY))
3495 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3496 goto failed_mount3;
3497
ac27a0ec
DK		 3498 /*
3499 * The first inode we look at is the journal inode. Don't try
3500 * root first: it may be modified in the journal!
3501 */
3502 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3503 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3504 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3505 goto failed_mount3;
0390131b
FM		 3506 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3507 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3508 ext4_msg(sb, KERN_ERR, "required journal recovery "
3509 "suppressed and not mounted read-only");
744692dc 3510 goto failed_mount_wq;
ac27a0ec 3511 } else {
fd8c37ec 3512 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3513 sbi->s_journal = NULL;
3514 needs_recovery = 0;
3515 goto no_journal;
ac27a0ec
DK		 3516 }
3517
eb40a09c
JS		 3518 if (ext4_blocks_count(es) > 0xffffffffULL &&
3519 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3520 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3521 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3522 goto failed_mount_wq;
eb40a09c
JS		 3523 }
3524
d4da6c9c
LT		 3525 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3526 jbd2_journal_set_features(sbi->s_journal,
3527 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3528 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3529 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3530 jbd2_journal_set_features(sbi->s_journal,
3531 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3532 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3533 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3534 } else {
3535 jbd2_journal_clear_features(sbi->s_journal,
3536 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3537 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3538 }
818d276c 3539
ac27a0ec
DK		 3540 /* We have now updated the journal if required, so we can
3541 * validate the data journaling mode. */
3542 switch (test_opt(sb, DATA_FLAGS)) {
3543 case 0:
3544 /* No mode set, assume a default based on the journal
63f57933
AM		 3545 * capabilities: ORDERED_DATA if the journal can
3546 * cope, else JOURNAL_DATA
3547 */
dab291af
MC		 3548 if (jbd2_journal_check_available_features
3549 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3550 set_opt(sb, ORDERED_DATA);
ac27a0ec 3551 else
fd8c37ec 3552 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3553 break;
3554
617ba13b
MC		 3555 case EXT4_MOUNT_ORDERED_DATA:
3556 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3557 if (!jbd2_journal_check_available_features
3558 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3559 ext4_msg(sb, KERN_ERR, "Journal does not support "
3560 "requested data journaling mode");
744692dc 3561 goto failed_mount_wq;
ac27a0ec
DK		 3562 }
3563 default:
3564 break;
3565 }
b3881f74 3566 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3567
ce7e010a
TT		 3568 /*
3569 * The journal may have updated the bg summary counts, so we
3570 * need to update the global counters.
3571 */
3572 percpu_counter_set(&sbi->s_freeblocks_counter,
3573 ext4_count_free_blocks(sb));
3574 percpu_counter_set(&sbi->s_freeinodes_counter,
3575 ext4_count_free_inodes(sb));
3576 percpu_counter_set(&sbi->s_dirs_counter,
3577 ext4_count_dirs(sb));
3578 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
206f7ab4 3579
ce7e010a 3580no_journal:
fd89d5f2
TH		 3581 /*
3582 * The maximum number of concurrent works can be high and
3583 * concurrency isn't really necessary. Limit it to 1.
3584 */
3585 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3586 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3587 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3588 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3589 goto failed_mount_wq;
3590 }
3591
ac27a0ec 3592 /*
dab291af 3593 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3594 * so we can safely mount the rest of the filesystem now.
3595 */
3596
1d1fe1ee
DH		 3597 root = ext4_iget(sb, EXT4_ROOT_INO);
3598 if (IS_ERR(root)) {
b31e1552 3599 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3600 ret = PTR_ERR(root);
32a9bb57 3601 root = NULL;
ac27a0ec
DK		 3602 goto failed_mount4;
3603 }
3604 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3605 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 3606 goto failed_mount4;
3607 }
1d1fe1ee
DH		 3608 sb->s_root = d_alloc_root(root);
3609 if (!sb->s_root) {
b31e1552 3610 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3611 ret = -ENOMEM;
3612 goto failed_mount4;
3613 }
ac27a0ec 3614
2b2d6d01 3615 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3616
3617 /* determine the minimum size of new large inodes, if present */
3618 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3619 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3620 EXT4_GOOD_OLD_INODE_SIZE;
3621 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3622 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3623 if (sbi->s_want_extra_isize <
3624 le16_to_cpu(es->s_want_extra_isize))
3625 sbi->s_want_extra_isize =
3626 le16_to_cpu(es->s_want_extra_isize);
3627 if (sbi->s_want_extra_isize <
3628 le16_to_cpu(es->s_min_extra_isize))
3629 sbi->s_want_extra_isize =
3630 le16_to_cpu(es->s_min_extra_isize);
3631 }
3632 }
3633 /* Check if enough inode space is available */
3634 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3635 sbi->s_inode_size) {
3636 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3637 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3638 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3639 "available");
ef7f3835
KS		 3640 }
3641
90576c0b
TT		 3642 if (test_opt(sb, DELALLOC) &&
3643 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 3644 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3645 "requested data journaling mode");
fd8c37ec 3646 clear_opt(sb, DELALLOC);
90576c0b 3647 }
744692dc
JZ		 3648 if (test_opt(sb, DIOREAD_NOLOCK)) {
3649 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3650 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3651 "option - requested data journaling mode");
fd8c37ec 3652 clear_opt(sb, DIOREAD_NOLOCK);
744692dc
JZ		 3653 }
3654 if (sb->s_blocksize < PAGE_SIZE) {
3655 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3656 "option - block size is too small");
fd8c37ec 3657 clear_opt(sb, DIOREAD_NOLOCK);
744692dc
JZ		 3658 }
3659 }
c2774d84 3660
6fd058f7
TT		 3661 err = ext4_setup_system_zone(sb);
3662 if (err) {
b31e1552 3663 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3664 "zone (%d)", err);
6fd058f7
TT		 3665 goto failed_mount4;
3666 }
3667
c2774d84
AK		 3668 ext4_ext_init(sb);
3669 err = ext4_mb_init(sb, needs_recovery);
3670 if (err) {
421f91d2 3671 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3672 err);
c2774d84
AK		 3673 goto failed_mount4;
3674 }
3675
bfff6873
LC		 3676 err = ext4_register_li_request(sb, first_not_zeroed);
3677 if (err)
3678 goto failed_mount4;
3679
3197ebdb
TT		 3680 sbi->s_kobj.kset = ext4_kset;
3681 init_completion(&sbi->s_kobj_unregister);
3682 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3683 "%s", sb->s_id);
3684 if (err) {
3685 ext4_mb_release(sb);
3686 ext4_ext_release(sb);
3687 goto failed_mount4;
3688 };
3689
617ba13b
MC		 3690 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3691 ext4_orphan_cleanup(sb, es);
3692 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3693 if (needs_recovery) {
b31e1552 3694 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3695 ext4_mark_recovery_complete(sb, es);
3696 }
3697 if (EXT4_SB(sb)->s_journal) {
3698 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3699 descr = " journalled data mode";
3700 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3701 descr = " ordered data mode";
3702 else
3703 descr = " writeback data mode";
3704 } else
3705 descr = "out journal";
3706
d4c402d9 3707 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3708 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3709 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3710
66e61a9e
TT		 3711 if (es->s_error_count)
3712 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3713
d4c402d9 3714 kfree(orig_data);
ac27a0ec
DK		 3715 return 0;
3716
617ba13b 3717cantfind_ext4:
ac27a0ec 3718 if (!silent)
b31e1552 3719 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3720 goto failed_mount;
3721
3722failed_mount4:
32a9bb57
MK		 3723 iput(root);
3724 sb->s_root = NULL;
b31e1552 3725 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3726 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3727failed_mount_wq:
6fd058f7 3728 ext4_release_system_zone(sb);
0390131b
FM		 3729 if (sbi->s_journal) {
3730 jbd2_journal_destroy(sbi->s_journal);
3731 sbi->s_journal = NULL;
3732 }
ac27a0ec 3733failed_mount3:
04496411 3734 del_timer(&sbi->s_err_report);
c5ca7c76
TT		 3735 if (sbi->s_flex_groups) {
3736 if (is_vmalloc_addr(sbi->s_flex_groups))
3737 vfree(sbi->s_flex_groups);
3738 else
3739 kfree(sbi->s_flex_groups);
3740 }
ce7e010a
TT		 3741 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3742 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3743 percpu_counter_destroy(&sbi->s_dirs_counter);
3744 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
c5e06d10
JL		 3745 if (sbi->s_mmp_tsk)
3746 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3747failed_mount2:
3748 for (i = 0; i < db_count; i++)
3749 brelse(sbi->s_group_desc[i]);
3750 kfree(sbi->s_group_desc);
3751failed_mount:
240799cd 3752 if (sbi->s_proc) {
9f6200bb 3753 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3754 }
ac27a0ec
DK		 3755#ifdef CONFIG_QUOTA
3756 for (i = 0; i < MAXQUOTAS; i++)
3757 kfree(sbi->s_qf_names[i]);
3758#endif
617ba13b 3759 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3760 brelse(bh);
3761out_fail:
3762 sb->s_fs_info = NULL;
f6830165 3763 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3764 kfree(sbi);
dcc7dae3 3765out_free_orig:
d4c402d9 3766 kfree(orig_data);
1d1fe1ee 3767 return ret;
ac27a0ec
DK		 3768}
3769
3770/*
3771 * Setup any per-fs journal parameters now. We'll do this both on
3772 * initial mount, once the journal has been initialised but before we've
3773 * done any recovery; and again on any subsequent remount.
3774 */
617ba13b 3775static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3776{
617ba13b 3777 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3778
30773840
TT		 3779 journal->j_commit_interval = sbi->s_commit_interval;
3780 journal->j_min_batch_time = sbi->s_min_batch_time;
3781 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3782
a931da6a 3783 write_lock(&journal->j_state_lock);
ac27a0ec 3784 if (test_opt(sb, BARRIER))
dab291af 3785 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3786 else
dab291af 3787 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3788 if (test_opt(sb, DATA_ERR_ABORT))
3789 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3790 else
3791 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3792 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3793}
3794
617ba13b 3795static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3796 unsigned int journal_inum)
3797{
3798 struct inode *journal_inode;
3799 journal_t *journal;
3800
0390131b
FM		 3801 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3802
ac27a0ec
DK		 3803 /* First, test for the existence of a valid inode on disk. Bad
3804 * things happen if we iget() an unused inode, as the subsequent
3805 * iput() will try to delete it. */
3806
1d1fe1ee
DH		 3807 journal_inode = ext4_iget(sb, journal_inum);
3808 if (IS_ERR(journal_inode)) {
b31e1552 3809 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3810 return NULL;
3811 }
3812 if (!journal_inode->i_nlink) {
3813 make_bad_inode(journal_inode);
3814 iput(journal_inode);
b31e1552 3815 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3816 return NULL;
3817 }
3818
e5f8eab8 3819 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3820 journal_inode, journal_inode->i_size);
1d1fe1ee 3821 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3822 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3823 iput(journal_inode);
3824 return NULL;
3825 }
3826
dab291af 3827 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3828 if (!journal) {
b31e1552 3829 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3830 iput(journal_inode);
3831 return NULL;
3832 }
3833 journal->j_private = sb;
617ba13b 3834 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3835 return journal;
3836}
3837
617ba13b 3838static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3839 dev_t j_dev)
3840{
2b2d6d01 3841 struct buffer_head *bh;
ac27a0ec 3842 journal_t *journal;
617ba13b
MC		 3843 ext4_fsblk_t start;
3844 ext4_fsblk_t len;
ac27a0ec 3845 int hblock, blocksize;
617ba13b 3846 ext4_fsblk_t sb_block;
ac27a0ec 3847 unsigned long offset;
2b2d6d01 3848 struct ext4_super_block *es;
ac27a0ec
DK		 3849 struct block_device *bdev;
3850
0390131b
FM		 3851 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3852
b31e1552 3853 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3854 if (bdev == NULL)
3855 return NULL;
3856
ac27a0ec 3857 blocksize = sb->s_blocksize;
e1defc4f 3858 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3859 if (blocksize < hblock) {
b31e1552
ES		 3860 ext4_msg(sb, KERN_ERR,
3861 "blocksize too small for journal device");
ac27a0ec
DK		 3862 goto out_bdev;
3863 }
3864
617ba13b
MC		 3865 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3866 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3867 set_blocksize(bdev, blocksize);
3868 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3869 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3870 "external journal");
ac27a0ec
DK		 3871 goto out_bdev;
3872 }
3873
617ba13b
MC		 3874 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3875 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3876 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3877 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3878 ext4_msg(sb, KERN_ERR, "external journal has "
3879 "bad superblock");
ac27a0ec
DK		 3880 brelse(bh);
3881 goto out_bdev;
3882 }
3883
617ba13b 3884 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3885 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3886 brelse(bh);
3887 goto out_bdev;
3888 }
3889
bd81d8ee 3890 len = ext4_blocks_count(es);
ac27a0ec
DK		 3891 start = sb_block + 1;
3892 brelse(bh); /* we're done with the superblock */
3893
dab291af 3894 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3895 start, len, blocksize);
3896 if (!journal) {
b31e1552 3897 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3898 goto out_bdev;
3899 }
3900 journal->j_private = sb;
3901 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3902 wait_on_buffer(journal->j_sb_buffer);
3903 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3904 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3905 goto out_journal;
3906 }
3907 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3908 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3909 "user (unsupported) - %d",
ac27a0ec
DK		 3910 be32_to_cpu(journal->j_superblock->s_nr_users));
3911 goto out_journal;
3912 }
617ba13b
MC		 3913 EXT4_SB(sb)->journal_bdev = bdev;
3914 ext4_init_journal_params(sb, journal);
ac27a0ec 3915 return journal;
0b8e58a1 3916
ac27a0ec 3917out_journal:
dab291af 3918 jbd2_journal_destroy(journal);
ac27a0ec 3919out_bdev:
617ba13b 3920 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3921 return NULL;
3922}
3923
617ba13b
MC		 3924static int ext4_load_journal(struct super_block *sb,
3925 struct ext4_super_block *es,
ac27a0ec
DK		 3926 unsigned long journal_devnum)
3927{
3928 journal_t *journal;
3929 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3930 dev_t journal_dev;
3931 int err = 0;
3932 int really_read_only;
3933
0390131b
FM		 3934 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3935
ac27a0ec
DK		 3936 if (journal_devnum &&
3937 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3938 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3939 "numbers have changed");
ac27a0ec
DK		 3940 journal_dev = new_decode_dev(journal_devnum);
3941 } else
3942 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3943
3944 really_read_only = bdev_read_only(sb->s_bdev);
3945
3946 /*
3947 * Are we loading a blank journal or performing recovery after a
3948 * crash? For recovery, we need to check in advance whether we
3949 * can get read-write access to the device.
3950 */
617ba13b 3951 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3952 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3953 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3954 "required on readonly filesystem");
ac27a0ec 3955 if (really_read_only) {
b31e1552
ES		 3956 ext4_msg(sb, KERN_ERR, "write access "
3957 "unavailable, cannot proceed");
ac27a0ec
DK		 3958 return -EROFS;
3959 }
b31e1552
ES		 3960 ext4_msg(sb, KERN_INFO, "write access will "
3961 "be enabled during recovery");
ac27a0ec
DK		 3962 }
3963 }
3964
3965 if (journal_inum && journal_dev) {
b31e1552
ES		 3966 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3967 "and inode journals!");
ac27a0ec
DK		 3968 return -EINVAL;
3969 }
3970
3971 if (journal_inum) {
617ba13b 3972 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3973 return -EINVAL;
3974 } else {
617ba13b 3975 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3976 return -EINVAL;
3977 }
3978
90576c0b 3979 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3980 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3981
ac27a0ec 3982 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3983 err = jbd2_journal_update_format(journal);
ac27a0ec 3984 if (err) {
b31e1552 3985 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3986 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3987 return err;
3988 }
3989 }
3990
617ba13b 3991 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3992 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 3993 if (!err) {
3994 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3995 if (save)
3996 memcpy(save, ((char *) es) +
3997 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 3998 err = jbd2_journal_load(journal);
1c13d5c0
TT		 3999 if (save)
4000 memcpy(((char *) es) + EXT4_S_ERR_START,
4001 save, EXT4_S_ERR_LEN);
4002 kfree(save);
4003 }
ac27a0ec
DK		 4004
4005 if (err) {
b31e1552 4006 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4007 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4008 return err;
4009 }
4010
617ba13b
MC		 4011 EXT4_SB(sb)->s_journal = journal;
4012 ext4_clear_journal_err(sb, es);
ac27a0ec 4013
c41303ce 4014 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4015 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4016 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4017
4018 /* Make sure we flush the recovery flag to disk. */
e2d67052 4019 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4020 }
4021
4022 return 0;
4023}
4024
e2d67052 4025static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4026{
e2d67052 4027 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4028 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4029 int error = 0;
ac27a0ec
DK		 4030
4031 if (!sbh)
c4be0c1d 4032 return error;
914258bf
TT		 4033 if (buffer_write_io_error(sbh)) {
4034 /*
4035 * Oh, dear. A previous attempt to write the
4036 * superblock failed. This could happen because the
4037 * USB device was yanked out. Or it could happen to
4038 * be a transient write error and maybe the block will
4039 * be remapped. Nothing we can do but to retry the
4040 * write and hope for the best.
4041 */
b31e1552
ES		 4042 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4043 "superblock detected");
914258bf
TT		 4044 clear_buffer_write_io_error(sbh);
4045 set_buffer_uptodate(sbh);
4046 }
71290b36
TT		 4047 /*
4048 * If the file system is mounted read-only, don't update the
4049 * superblock write time. This avoids updating the superblock
4050 * write time when we are mounting the root file system
4051 * read/only but we need to replay the journal; at that point,
4052 * for people who are east of GMT and who make their clock
4053 * tick in localtime for Windows bug-for-bug compatibility,
4054 * the clock is set in the future, and this will cause e2fsck
4055 * to complain and force a full file system check.
4056 */
4057 if (!(sb->s_flags & MS_RDONLY))
4058 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4059 if (sb->s_bdev->bd_part)
4060 es->s_kbytes_written =
4061 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4062 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4063 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4064 else
4065 es->s_kbytes_written =
4066 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
ce7e010a
TT		 4067 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
4068 &EXT4_SB(sb)->s_freeblocks_counter));
4069 es->s_free_inodes_count =
4070 cpu_to_le32(percpu_counter_sum_positive(
4071 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4072 sb->s_dirt = 0;
ac27a0ec
DK		 4073 BUFFER_TRACE(sbh, "marking dirty");
4074 mark_buffer_dirty(sbh);
914258bf 4075 if (sync) {
c4be0c1d
TS		 4076 error = sync_dirty_buffer(sbh);
4077 if (error)
4078 return error;
4079
4080 error = buffer_write_io_error(sbh);
4081 if (error) {
b31e1552
ES		 4082 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4083 "superblock");
914258bf
TT		 4084 clear_buffer_write_io_error(sbh);
4085 set_buffer_uptodate(sbh);
4086 }
4087 }
c4be0c1d 4088 return error;
ac27a0ec
DK		 4089}
4090
ac27a0ec
DK		 4091/*
4092 * Have we just finished recovery? If so, and if we are mounting (or
4093 * remounting) the filesystem readonly, then we will end up with a
4094 * consistent fs on disk. Record that fact.
4095 */
2b2d6d01
TT		 4096static void ext4_mark_recovery_complete(struct super_block *sb,
4097 struct ext4_super_block *es)
ac27a0ec 4098{
617ba13b 4099 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4100
0390131b
FM		 4101 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4102 BUG_ON(journal != NULL);
4103 return;
4104 }
dab291af 4105 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4106 if (jbd2_journal_flush(journal) < 0)
4107 goto out;
4108
617ba13b 4109 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4110 sb->s_flags & MS_RDONLY) {
617ba13b 4111 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4112 ext4_commit_super(sb, 1);
ac27a0ec 4113 }
7ffe1ea8
HK		 4114
4115out:
dab291af 4116 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4117}
4118
4119/*
4120 * If we are mounting (or read-write remounting) a filesystem whose journal
4121 * has recorded an error from a previous lifetime, move that error to the
4122 * main filesystem now.
4123 */
2b2d6d01
TT		 4124static void ext4_clear_journal_err(struct super_block *sb,
4125 struct ext4_super_block *es)
ac27a0ec
DK		 4126{
4127 journal_t *journal;
4128 int j_errno;
4129 const char *errstr;
4130
0390131b
FM		 4131 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4132
617ba13b 4133 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4134
4135 /*
4136 * Now check for any error status which may have been recorded in the
617ba13b 4137 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4138 */
4139
dab291af 4140 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4141 if (j_errno) {
4142 char nbuf[16];
4143
617ba13b 4144 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4145 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4146 "from previous mount: %s", errstr);
12062ddd 4147 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4148
617ba13b
MC		 4149 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4150 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4151 ext4_commit_super(sb, 1);
ac27a0ec 4152
dab291af 4153 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4154 }
4155}
4156
4157/*
4158 * Force the running and committing transactions to commit,
4159 * and wait on the commit.
4160 */
617ba13b 4161int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4162{
4163 journal_t *journal;
0390131b 4164 int ret = 0;
ac27a0ec
DK		 4165
4166 if (sb->s_flags & MS_RDONLY)
4167 return 0;
4168
617ba13b 4169 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4170 if (journal) {
437f88cc 4171 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4172 ret = ext4_journal_force_commit(journal);
6b0310fb 4173 }
0390131b 4174
ac27a0ec
DK		 4175 return ret;
4176}
4177
2b2d6d01 4178static void ext4_write_super(struct super_block *sb)
ac27a0ec 4179{
ebc1ac16 4180 lock_super(sb);
9ca92389 4181 ext4_commit_super(sb, 1);
ebc1ac16 4182 unlock_super(sb);
ac27a0ec
DK		 4183}
4184
617ba13b 4185static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4186{
14ce0cb4 4187 int ret = 0;
9eddacf9 4188 tid_t target;
8d5d02e6 4189 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4190
9bffad1e 4191 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4192 flush_workqueue(sbi->dio_unwritten_wq);
4193 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4194 if (wait)
8d5d02e6 4195 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4196 }
14ce0cb4 4197 return ret;
ac27a0ec
DK		 4198}
4199
4200/*
4201 * LVM calls this function before a (read-only) snapshot is created. This
4202 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4203 *
4204 * Note that only this function cannot bring a filesystem to be in a clean
4205 * state independently, because ext4 prevents a new handle from being started
4206 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4207 * the upper layer.
ac27a0ec 4208 */
c4be0c1d 4209static int ext4_freeze(struct super_block *sb)
ac27a0ec 4210{
c4be0c1d
TS		 4211 int error = 0;
4212 journal_t *journal;
ac27a0ec 4213
9ca92389
TT		 4214 if (sb->s_flags & MS_RDONLY)
4215 return 0;
ac27a0ec 4216
9ca92389 4217 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4218
9ca92389
TT		 4219 /* Now we set up the journal barrier. */
4220 jbd2_journal_lock_updates(journal);
ac27a0ec 4221
9ca92389
TT		 4222 /*
4223 * Don't clear the needs_recovery flag if we failed to flush
4224 * the journal.
4225 */
4226 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4227 if (error < 0)
4228 goto out;
9ca92389
TT		 4229
4230 /* Journal blocked and flushed, clear needs_recovery flag. */
4231 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4232 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4233out:
4234 /* we rely on s_frozen to stop further updates */
4235 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4236 return error;
ac27a0ec
DK		 4237}
4238
4239/*
4240 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4241 * flag here, even though the filesystem is not technically dirty yet.
4242 */
c4be0c1d 4243static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4244{
9ca92389
TT		 4245 if (sb->s_flags & MS_RDONLY)
4246 return 0;
4247
4248 lock_super(sb);
4249 /* Reset the needs_recovery flag before the fs is unlocked. */
4250 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4251 ext4_commit_super(sb, 1);
4252 unlock_super(sb);
c4be0c1d 4253 return 0;
ac27a0ec
DK		 4254}
4255
673c6100
TT		 4256/*
4257 * Structure to save mount options for ext4_remount's benefit
4258 */
4259struct ext4_mount_options {
4260 unsigned long s_mount_opt;
a2595b8a 4261 unsigned long s_mount_opt2;
673c6100
TT		 4262 uid_t s_resuid;
4263 gid_t s_resgid;
4264 unsigned long s_commit_interval;
4265 u32 s_min_batch_time, s_max_batch_time;
4266#ifdef CONFIG_QUOTA
4267 int s_jquota_fmt;
4268 char *s_qf_names[MAXQUOTAS];
4269#endif
4270};
4271
2b2d6d01 4272static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4273{
2b2d6d01 4274 struct ext4_super_block *es;
617ba13b
MC		 4275 struct ext4_sb_info *sbi = EXT4_SB(sb);
4276 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 4277 unsigned long old_sb_flags;
617ba13b 4278 struct ext4_mount_options old_opts;
c79d967d 4279 int enable_quota = 0;
8a266467 4280 ext4_group_t g;
b3881f74 4281 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4282 int err = 0;
ac27a0ec
DK		 4283#ifdef CONFIG_QUOTA
4284 int i;
4285#endif
d4c402d9 4286 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4287
4288 /* Store the original options */
bbd6851a 4289 lock_super(sb);
ac27a0ec
DK		 4290 old_sb_flags = sb->s_flags;
4291 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4292 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4293 old_opts.s_resuid = sbi->s_resuid;
4294 old_opts.s_resgid = sbi->s_resgid;
4295 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4296 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4297 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4298#ifdef CONFIG_QUOTA
4299 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4300 for (i = 0; i < MAXQUOTAS; i++)
4301 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4302#endif
b3881f74
TT		 4303 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4304 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4305
4306 /*
4307 * Allow the "check" option to be passed as a remount option.
4308 */
b3881f74
TT		 4309 if (!parse_options(data, sb, NULL, &journal_ioprio,
4310 &n_blocks_count, 1)) {
ac27a0ec
DK		 4311 err = -EINVAL;
4312 goto restore_opts;
4313 }
4314
4ab2f15b 4315 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4316 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4317
4318 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4319 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4320
4321 es = sbi->s_es;
4322
b3881f74 4323 if (sbi->s_journal) {
0390131b 4324 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4325 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4326 }
ac27a0ec
DK		 4327
4328 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 4329 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 4330 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4331 err = -EROFS;
4332 goto restore_opts;
4333 }
4334
4335 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4336 err = dquot_suspend(sb, -1);
4337 if (err < 0)
c79d967d 4338 goto restore_opts;
c79d967d 4339
ac27a0ec
DK		 4340 /*
4341 * First of all, the unconditional stuff we have to do
4342 * to disable replay of the journal when we next remount
4343 */
4344 sb->s_flags |= MS_RDONLY;
4345
4346 /*
4347 * OK, test if we are remounting a valid rw partition
4348 * readonly, and if so set the rdonly flag and then
4349 * mark the partition as valid again.
4350 */
617ba13b
MC		 4351 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4352 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4353 es->s_state = cpu_to_le16(sbi->s_mount_state);
4354
a63c9eb2 4355 if (sbi->s_journal)
0390131b 4356 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4357 } else {
a13fb1a4
ES		 4358 /* Make sure we can mount this feature set readwrite */
4359 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4360 err = -EROFS;
4361 goto restore_opts;
4362 }
8a266467
TT		 4363 /*
4364 * Make sure the group descriptor checksums
0b8e58a1 4365 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4366 */
4367 for (g = 0; g < sbi->s_groups_count; g++) {
4368 struct ext4_group_desc *gdp =
4369 ext4_get_group_desc(sb, g, NULL);
4370
4371 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4372 ext4_msg(sb, KERN_ERR,
4373 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4374 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4375 le16_to_cpu(gdp->bg_checksum));
4376 err = -EINVAL;
4377 goto restore_opts;
4378 }
4379 }
4380
ead6596b
ES		 4381 /*
4382 * If we have an unprocessed orphan list hanging
4383 * around from a previously readonly bdev mount,
4384 * require a full umount/remount for now.
4385 */
4386 if (es->s_last_orphan) {
b31e1552 4387 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4388 "remount RDWR because of unprocessed "
4389 "orphan inode list. Please "
b31e1552 4390 "umount/remount instead");
ead6596b
ES		 4391 err = -EINVAL;
4392 goto restore_opts;
4393 }
4394
ac27a0ec
DK		 4395 /*
4396 * Mounting a RDONLY partition read-write, so reread
4397 * and store the current valid flag. (It may have
4398 * been changed by e2fsck since we originally mounted
4399 * the partition.)
4400 */
0390131b
FM		 4401 if (sbi->s_journal)
4402 ext4_clear_journal_err(sb, es);
ac27a0ec 4403 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 4404 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 4405 goto restore_opts;
2b2d6d01 4406 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4407 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4408 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4409 EXT4_FEATURE_INCOMPAT_MMP))
4410 if (ext4_multi_mount_protect(sb,
4411 le64_to_cpu(es->s_mmp_block))) {
4412 err = -EROFS;
4413 goto restore_opts;
4414 }
c79d967d 4415 enable_quota = 1;
ac27a0ec
DK		 4416 }
4417 }
bfff6873
LC		 4418
4419 /*
4420 * Reinitialize lazy itable initialization thread based on
4421 * current settings
4422 */
4423 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4424 ext4_unregister_li_request(sb);
4425 else {
4426 ext4_group_t first_not_zeroed;
4427 first_not_zeroed = ext4_has_uninit_itable(sb);
4428 ext4_register_li_request(sb, first_not_zeroed);
4429 }
4430
6fd058f7 4431 ext4_setup_system_zone(sb);
0390131b 4432 if (sbi->s_journal == NULL)
e2d67052 4433 ext4_commit_super(sb, 1);
0390131b 4434
ac27a0ec
DK		 4435#ifdef CONFIG_QUOTA
4436 /* Release old quota file names */
4437 for (i = 0; i < MAXQUOTAS; i++)
4438 if (old_opts.s_qf_names[i] &&
4439 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4440 kfree(old_opts.s_qf_names[i]);
4441#endif
bbd6851a 4442 unlock_super(sb);
c79d967d 4443 if (enable_quota)
0f0dd62f 4444 dquot_resume(sb, -1);
d4c402d9
CW		 4445
4446 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4447 kfree(orig_data);
ac27a0ec 4448 return 0;
0b8e58a1 4449
ac27a0ec
DK		 4450restore_opts:
4451 sb->s_flags = old_sb_flags;
4452 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4453 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4454 sbi->s_resuid = old_opts.s_resuid;
4455 sbi->s_resgid = old_opts.s_resgid;
4456 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4457 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4458 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4459#ifdef CONFIG_QUOTA
4460 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4461 for (i = 0; i < MAXQUOTAS; i++) {
4462 if (sbi->s_qf_names[i] &&
4463 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4464 kfree(sbi->s_qf_names[i]);
4465 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4466 }
4467#endif
bbd6851a 4468 unlock_super(sb);
d4c402d9 4469 kfree(orig_data);
ac27a0ec
DK		 4470 return err;
4471}
4472
2b2d6d01 4473static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4474{
4475 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4476 struct ext4_sb_info *sbi = EXT4_SB(sb);
4477 struct ext4_super_block *es = sbi->s_es;
960cc398 4478 u64 fsid;
d02a9391 4479 s64 bfree;
ac27a0ec 4480
5e70030d
BP		 4481 if (test_opt(sb, MINIX_DF)) {
4482 sbi->s_overhead_last = 0;
6bc9feff 4483 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4484 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4485 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4486
4487 /*
5e70030d
BP		 4488 * Compute the overhead (FS structures). This is constant
4489 * for a given filesystem unless the number of block groups
4490 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4491 */
4492
4493 /*
4494 * All of the blocks before first_data_block are
4495 * overhead
4496 */
4497 overhead = le32_to_cpu(es->s_first_data_block);
4498
4499 /*
4500 * Add the overhead attributed to the superblock and
4501 * block group descriptors. If the sparse superblocks
4502 * feature is turned on, then not all groups have this.
4503 */
4504 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 4505 overhead += ext4_bg_has_super(sb, i) +
4506 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 4507 cond_resched();
4508 }
4509
4510 /*
4511 * Every block group has an inode bitmap, a block
4512 * bitmap, and an inode table.
4513 */
5e70030d
BP		 4514 overhead += ngroups * (2 + sbi->s_itb_per_group);
4515 sbi->s_overhead_last = overhead;
4516 smp_wmb();
6bc9feff 4517 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4518 }
4519
617ba13b 4520 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4521 buf->f_bsize = sb->s_blocksize;
5e70030d 4522 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
d02a9391 4523 bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
6bc6e63f 4524 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
d02a9391
KM		 4525 /* prevent underflow in case that few free space is available */
4526 buf->f_bfree = max_t(s64, bfree, 0);
bd81d8ee
LV		 4527 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4528 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4529 buf->f_bavail = 0;
4530 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4531 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4532 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4533 fsid = le64_to_cpup((void *)es->s_uuid) ^
4534 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4535 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4536 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4537
ac27a0ec
DK		 4538 return 0;
4539}
4540
0b8e58a1
AD		 4541/* Helper function for writing quotas on sync - we need to start transaction
4542 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4543 * Process 1 Process 2
617ba13b 4544 * ext4_create() quota_sync()
a269eb18 4545 * jbd2_journal_start() write_dquot()
871a2931 4546 * dquot_initialize() down(dqio_mutex)
dab291af 4547 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4548 *
4549 */
4550
4551#ifdef CONFIG_QUOTA
4552
4553static inline struct inode *dquot_to_inode(struct dquot *dquot)
4554{
4555 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4556}
4557
617ba13b 4558static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4559{
4560 int ret, err;
4561 handle_t *handle;
4562 struct inode *inode;
4563
4564 inode = dquot_to_inode(dquot);
617ba13b 4565 handle = ext4_journal_start(inode,
0b8e58a1 4566 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4567 if (IS_ERR(handle))
4568 return PTR_ERR(handle);
4569 ret = dquot_commit(dquot);
617ba13b 4570 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4571 if (!ret)
4572 ret = err;
4573 return ret;
4574}
4575
617ba13b 4576static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4577{
4578 int ret, err;
4579 handle_t *handle;
4580
617ba13b 4581 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4582 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4583 if (IS_ERR(handle))
4584 return PTR_ERR(handle);
4585 ret = dquot_acquire(dquot);
617ba13b 4586 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4587 if (!ret)
4588 ret = err;
4589 return ret;
4590}
4591
617ba13b 4592static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4593{
4594 int ret, err;
4595 handle_t *handle;
4596
617ba13b 4597 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4598 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4599 if (IS_ERR(handle)) {
4600 /* Release dquot anyway to avoid endless cycle in dqput() */
4601 dquot_release(dquot);
ac27a0ec 4602 return PTR_ERR(handle);
9c3013e9 4603 }
ac27a0ec 4604 ret = dquot_release(dquot);
617ba13b 4605 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4606 if (!ret)
4607 ret = err;
4608 return ret;
4609}
4610
617ba13b 4611static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4612{
2c8be6b2 4613 /* Are we journaling quotas? */
617ba13b
MC		 4614 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4615 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4616 dquot_mark_dquot_dirty(dquot);
617ba13b 4617 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4618 } else {
4619 return dquot_mark_dquot_dirty(dquot);
4620 }
4621}
4622
617ba13b 4623static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4624{
4625 int ret, err;
4626 handle_t *handle;
4627
4628 /* Data block + inode block */
617ba13b 4629 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4630 if (IS_ERR(handle))
4631 return PTR_ERR(handle);
4632 ret = dquot_commit_info(sb, type);
617ba13b 4633 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4634 if (!ret)
4635 ret = err;
4636 return ret;
4637}
4638
4639/*
4640 * Turn on quotas during mount time - we need to find
4641 * the quota file and such...
4642 */
617ba13b 4643static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4644{
287a8095
CH		 4645 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4646 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4647}
4648
4649/*
4650 * Standard function to be called on quota_on
4651 */
617ba13b 4652static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4653 struct path *path)
ac27a0ec
DK		 4654{
4655 int err;
ac27a0ec
DK		 4656
4657 if (!test_opt(sb, QUOTA))
4658 return -EINVAL;
0623543b 4659
ac27a0ec 4660 /* Quotafile not on the same filesystem? */
f00c9e44 4661 if (path->mnt->mnt_sb != sb)
ac27a0ec 4662 return -EXDEV;
0623543b
JK		 4663 /* Journaling quota? */
4664 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4665 /* Quotafile not in fs root? */
f00c9e44 4666 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4667 ext4_msg(sb, KERN_WARNING,
4668 "Quota file not on filesystem root. "
4669 "Journaled quota will not work");
2b2d6d01 4670 }
0623543b
JK		 4671
4672 /*
4673 * When we journal data on quota file, we have to flush journal to see
4674 * all updates to the file when we bypass pagecache...
4675 */
0390131b 4676 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4677 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4678 /*
4679 * We don't need to lock updates but journal_flush() could
4680 * otherwise be livelocked...
4681 */
4682 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4683 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4684 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4685 if (err)
7ffe1ea8 4686 return err;
0623543b
JK		 4687 }
4688
f00c9e44 4689 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4690}
4691
ca0e05e4
DM		 4692static int ext4_quota_off(struct super_block *sb, int type)
4693{
21f97697
JK		 4694 struct inode *inode = sb_dqopt(sb)->files[type];
4695 handle_t *handle;
4696
87009d86
DM		 4697 /* Force all delayed allocation blocks to be allocated.
4698 * Caller already holds s_umount sem */
4699 if (test_opt(sb, DELALLOC))
ca0e05e4 4700 sync_filesystem(sb);
ca0e05e4 4701
0b268590
AG		 4702 if (!inode)
4703 goto out;
4704
21f97697
JK		 4705 /* Update modification times of quota files when userspace can
4706 * start looking at them */
4707 handle = ext4_journal_start(inode, 1);
4708 if (IS_ERR(handle))
4709 goto out;
4710 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4711 ext4_mark_inode_dirty(handle, inode);
4712 ext4_journal_stop(handle);
4713
4714out:
ca0e05e4
DM		 4715 return dquot_quota_off(sb, type);
4716}
4717
ac27a0ec
DK		 4718/* Read data from quotafile - avoid pagecache and such because we cannot afford
4719 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4720 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4721 * we don't have to be afraid of races */
617ba13b 4722static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4723 size_t len, loff_t off)
4724{
4725 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4726 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4727 int err = 0;
4728 int offset = off & (sb->s_blocksize - 1);
4729 int tocopy;
4730 size_t toread;
4731 struct buffer_head *bh;
4732 loff_t i_size = i_size_read(inode);
4733
4734 if (off > i_size)
4735 return 0;
4736 if (off+len > i_size)
4737 len = i_size-off;
4738 toread = len;
4739 while (toread > 0) {
4740 tocopy = sb->s_blocksize - offset < toread ?
4741 sb->s_blocksize - offset : toread;
617ba13b 4742 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4743 if (err)
4744 return err;
4745 if (!bh) /* A hole? */
4746 memset(data, 0, tocopy);
4747 else
4748 memcpy(data, bh->b_data+offset, tocopy);
4749 brelse(bh);
4750 offset = 0;
4751 toread -= tocopy;
4752 data += tocopy;
4753 blk++;
4754 }
4755 return len;
4756}
4757
4758/* Write to quotafile (we know the transaction is already started and has
4759 * enough credits) */
617ba13b 4760static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4761 const char *data, size_t len, loff_t off)
4762{
4763 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4764 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4765 int err = 0;
4766 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4767 struct buffer_head *bh;
4768 handle_t *handle = journal_current_handle();
4769
0390131b 4770 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4771 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4772 " cancelled because transaction is not started",
9c3013e9
JK		 4773 (unsigned long long)off, (unsigned long long)len);
4774 return -EIO;
4775 }
67eeb568
DM		 4776 /*
4777 * Since we account only one data block in transaction credits,
4778 * then it is impossible to cross a block boundary.
4779 */
4780 if (sb->s_blocksize - offset < len) {
4781 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4782 " cancelled because not block aligned",
4783 (unsigned long long)off, (unsigned long long)len);
4784 return -EIO;
4785 }
4786
ac27a0ec 4787 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4788 bh = ext4_bread(handle, inode, blk, 1, &err);
4789 if (!bh)
4790 goto out;
62d2b5f2
JK		 4791 err = ext4_journal_get_write_access(handle, bh);
4792 if (err) {
4793 brelse(bh);
4794 goto out;
ac27a0ec 4795 }
67eeb568
DM		 4796 lock_buffer(bh);
4797 memcpy(bh->b_data+offset, data, len);
4798 flush_dcache_page(bh->b_page);
4799 unlock_buffer(bh);
62d2b5f2 4800 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4801 brelse(bh);
ac27a0ec 4802out:
67eeb568 4803 if (err) {
4d04e4fb 4804 mutex_unlock(&inode->i_mutex);
ac27a0ec 4805 return err;
4d04e4fb 4806 }
67eeb568
DM		 4807 if (inode->i_size < off + len) {
4808 i_size_write(inode, off + len);
617ba13b 4809 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4810 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4811 }
ac27a0ec 4812 mutex_unlock(&inode->i_mutex);
67eeb568 4813 return len;
ac27a0ec
DK		 4814}
4815
4816#endif
4817
152a0836
AV		 4818static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4819 const char *dev_name, void *data)
ac27a0ec 4820{
152a0836 4821 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4822}
4823
37f328eb 4824#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4825static inline void register_as_ext2(void)
4826{
4827 int err = register_filesystem(&ext2_fs_type);
4828 if (err)
4829 printk(KERN_WARNING
4830 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4831}
4832
4833static inline void unregister_as_ext2(void)
4834{
4835 unregister_filesystem(&ext2_fs_type);
4836}
2035e776
TT		 4837
4838static inline int ext2_feature_set_ok(struct super_block *sb)
4839{
4840 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4841 return 0;
4842 if (sb->s_flags & MS_RDONLY)
4843 return 1;
4844 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4845 return 0;
4846 return 1;
4847}
51b7e3c9 4848MODULE_ALIAS("ext2");
24b58424
TT		 4849#else
4850static inline void register_as_ext2(void) { }
4851static inline void unregister_as_ext2(void) { }
2035e776 4852static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4853#endif
4854
37f328eb 4855#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4856static inline void register_as_ext3(void)
4857{
4858 int err = register_filesystem(&ext3_fs_type);
4859 if (err)
4860 printk(KERN_WARNING
4861 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4862}
4863
4864static inline void unregister_as_ext3(void)
4865{
4866 unregister_filesystem(&ext3_fs_type);
4867}
2035e776
TT		 4868
4869static inline int ext3_feature_set_ok(struct super_block *sb)
4870{
4871 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4872 return 0;
4873 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4874 return 0;
4875 if (sb->s_flags & MS_RDONLY)
4876 return 1;
4877 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4878 return 0;
4879 return 1;
4880}
51b7e3c9 4881MODULE_ALIAS("ext3");
24b58424
TT		 4882#else
4883static inline void register_as_ext3(void) { }
4884static inline void unregister_as_ext3(void) { }
2035e776 4885static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4886#endif
4887
03010a33
TT		 4888static struct file_system_type ext4_fs_type = {
4889 .owner = THIS_MODULE,
4890 .name = "ext4",
152a0836 4891 .mount = ext4_mount,
03010a33
TT		 4892 .kill_sb = kill_block_super,
4893 .fs_flags = FS_REQUIRES_DEV,
4894};
4895
8f021222 4896static int __init ext4_init_feat_adverts(void)
857ac889
LC		 4897{
4898 struct ext4_features *ef;
4899 int ret = -ENOMEM;
4900
4901 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4902 if (!ef)
4903 goto out;
4904
4905 ef->f_kobj.kset = ext4_kset;
4906 init_completion(&ef->f_kobj_unregister);
4907 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4908 "features");
4909 if (ret) {
4910 kfree(ef);
4911 goto out;
4912 }
4913
4914 ext4_feat = ef;
4915 ret = 0;
4916out:
4917 return ret;
4918}
4919
8f021222
LC		 4920static void ext4_exit_feat_adverts(void)
4921{
4922 kobject_put(&ext4_feat->f_kobj);
4923 wait_for_completion(&ext4_feat->f_kobj_unregister);
4924 kfree(ext4_feat);
4925}
4926
e9e3bcec
ES		 4927/* Shared across all ext4 file systems */
4928wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4929struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4930
5dabfc78 4931static int __init ext4_init_fs(void)
ac27a0ec 4932{
e9e3bcec 4933 int i, err;
c9de560d 4934
12e9b892 4935 ext4_check_flag_values();
e9e3bcec
ES		 4936
4937 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4938 mutex_init(&ext4__aio_mutex[i]);
4939 init_waitqueue_head(&ext4__ioend_wq[i]);
4940 }
4941
5dabfc78 4942 err = ext4_init_pageio();
6fd058f7
TT		 4943 if (err)
4944 return err;
5dabfc78 4945 err = ext4_init_system_zone();
bd2d0210 4946 if (err)
dd68314c 4947 goto out7;
3197ebdb
TT		 4948 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4949 if (!ext4_kset)
dd68314c 4950 goto out6;
9f6200bb 4951 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
dd68314c
TT		 4952 if (!ext4_proc_root)
4953 goto out5;
857ac889
LC		 4954
4955 err = ext4_init_feat_adverts();
dd68314c
TT		 4956 if (err)
4957 goto out4;
857ac889 4958
5dabfc78 4959 err = ext4_init_mballoc();
ac27a0ec 4960 if (err)
6fd058f7 4961 goto out3;
c9de560d 4962
5dabfc78 4963 err = ext4_init_xattr();
c9de560d
AT		 4964 if (err)
4965 goto out2;
ac27a0ec
DK		 4966 err = init_inodecache();
4967 if (err)
4968 goto out1;
24b58424 4969 register_as_ext3();
2035e776 4970 register_as_ext2();
03010a33 4971 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4972 if (err)
4973 goto out;
bfff6873
LC		 4974
4975 ext4_li_info = NULL;
4976 mutex_init(&ext4_li_mtx);
ac27a0ec
DK		 4977 return 0;
4978out:
24b58424
TT		 4979 unregister_as_ext2();
4980 unregister_as_ext3();
ac27a0ec
DK		 4981 destroy_inodecache();
4982out1:
5dabfc78 4983 ext4_exit_xattr();
c9de560d 4984out2:
5dabfc78 4985 ext4_exit_mballoc();
6fd058f7 4986out3:
8f021222 4987 ext4_exit_feat_adverts();
dd68314c 4988out4:
6fd058f7 4989 remove_proc_entry("fs/ext4", NULL);
dd68314c 4990out5:
6fd058f7 4991 kset_unregister(ext4_kset);
dd68314c 4992out6:
5dabfc78 4993 ext4_exit_system_zone();
dd68314c 4994out7:
5dabfc78 4995 ext4_exit_pageio();
ac27a0ec
DK		 4996 return err;
4997}
4998
5dabfc78 4999static void __exit ext4_exit_fs(void)
ac27a0ec 5000{
bfff6873 5001 ext4_destroy_lazyinit_thread();
24b58424
TT		 5002 unregister_as_ext2();
5003 unregister_as_ext3();
03010a33 5004 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5005 destroy_inodecache();
5dabfc78
TT		 5006 ext4_exit_xattr();
5007 ext4_exit_mballoc();
8f021222 5008 ext4_exit_feat_adverts();
9f6200bb 5009 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5010 kset_unregister(ext4_kset);
5dabfc78
TT		 5011 ext4_exit_system_zone();
5012 ext4_exit_pageio();
ac27a0ec
DK		 5013}
5014
5015MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5016MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5017MODULE_LICENSE("GPL");
5dabfc78
TT		 5018module_init(ext4_init_fs)
5019module_exit(ext4_exit_fs)
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