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Merge tag 'char-misc-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[deliverable/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 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 77static void ext4_write_super(struct super_block *sb);
c4be0c1d 78static int ext4_freeze(struct super_block *sb);
152a0836
AV		 79static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
2035e776
TT		 81static inline int ext2_feature_set_ok(struct super_block *sb);
82static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 83static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 84static void ext4_destroy_lazyinit_thread(void);
85static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 86static void ext4_clear_request_list(void);
ac27a0ec 87
2035e776
TT		 88#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95};
96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
110#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111#else
112#define IS_EXT3_SB(sb) (0)
113#endif
bd81d8ee 114
9933fc0a
TT		 115void *ext4_kvmalloc(size_t size, gfp_t flags)
116{
117 void *ret;
118
119 ret = kmalloc(size, flags);
120 if (!ret)
121 ret = __vmalloc(size, flags, PAGE_KERNEL);
122 return ret;
123}
124
125void *ext4_kvzalloc(size_t size, gfp_t flags)
126{
127 void *ret;
128
db9481c0 129 ret = kzalloc(size, flags);
9933fc0a
TT		 130 if (!ret)
131 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
132 return ret;
133}
134
135void ext4_kvfree(void *ptr)
136{
137 if (is_vmalloc_addr(ptr))
138 vfree(ptr);
139 else
140 kfree(ptr);
141
142}
143
8fadc143
AR		 144ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
145 struct ext4_group_desc *bg)
bd81d8ee 146{
3a14589c 147 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 148 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 149 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 150}
151
8fadc143
AR		 152ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
153 struct ext4_group_desc *bg)
bd81d8ee 154{
5272f837 155 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 156 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 157 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 158}
159
8fadc143
AR		 160ext4_fsblk_t ext4_inode_table(struct super_block *sb,
161 struct ext4_group_desc *bg)
bd81d8ee 162{
5272f837 163 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 164 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 165 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 166}
167
021b65bb
TT		 168__u32 ext4_free_group_clusters(struct super_block *sb,
169 struct ext4_group_desc *bg)
560671a0
AK		 170{
171 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
172 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 173 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 174}
175
176__u32 ext4_free_inodes_count(struct super_block *sb,
177 struct ext4_group_desc *bg)
178{
179 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
180 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 181 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 182}
183
184__u32 ext4_used_dirs_count(struct super_block *sb,
185 struct ext4_group_desc *bg)
186{
187 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
188 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 189 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 190}
191
192__u32 ext4_itable_unused_count(struct super_block *sb,
193 struct ext4_group_desc *bg)
194{
195 return le16_to_cpu(bg->bg_itable_unused_lo) |
196 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 197 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 198}
199
8fadc143
AR		 200void ext4_block_bitmap_set(struct super_block *sb,
201 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 202{
3a14589c 203 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 204 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
205 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 206}
207
8fadc143
AR		 208void ext4_inode_bitmap_set(struct super_block *sb,
209 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 210{
5272f837 211 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 212 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
213 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 214}
215
8fadc143
AR		 216void ext4_inode_table_set(struct super_block *sb,
217 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 218{
5272f837 219 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 220 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
221 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 222}
223
021b65bb
TT		 224void ext4_free_group_clusters_set(struct super_block *sb,
225 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 226{
227 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
228 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
229 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
230}
231
232void ext4_free_inodes_set(struct super_block *sb,
233 struct ext4_group_desc *bg, __u32 count)
234{
235 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
236 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
237 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
238}
239
240void ext4_used_dirs_set(struct super_block *sb,
241 struct ext4_group_desc *bg, __u32 count)
242{
243 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
244 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
245 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
246}
247
248void ext4_itable_unused_set(struct super_block *sb,
249 struct ext4_group_desc *bg, __u32 count)
250{
251 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
252 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
253 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
254}
255
d3d1faf6
CW		 256
257/* Just increment the non-pointer handle value */
258static handle_t *ext4_get_nojournal(void)
259{
260 handle_t *handle = current->journal_info;
261 unsigned long ref_cnt = (unsigned long)handle;
262
263 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
264
265 ref_cnt++;
266 handle = (handle_t *)ref_cnt;
267
268 current->journal_info = handle;
269 return handle;
270}
271
272
273/* Decrement the non-pointer handle value */
274static void ext4_put_nojournal(handle_t *handle)
275{
276 unsigned long ref_cnt = (unsigned long)handle;
277
278 BUG_ON(ref_cnt == 0);
279
280 ref_cnt--;
281 handle = (handle_t *)ref_cnt;
282
283 current->journal_info = handle;
284}
285
ac27a0ec 286/*
dab291af 287 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 288 *
289 * The only special thing we need to do here is to make sure that all
290 * journal_end calls result in the superblock being marked dirty, so
291 * that sync() will call the filesystem's write_super callback if
292 * appropriate.
be4f27d3
YY		 293 *
294 * To avoid j_barrier hold in userspace when a user calls freeze(),
295 * ext4 prevents a new handle from being started by s_frozen, which
296 * is in an upper layer.
ac27a0ec 297 */
617ba13b 298handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 299{
300 journal_t *journal;
be4f27d3 301 handle_t *handle;
ac27a0ec 302
12706394 303 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 304 if (sb->s_flags & MS_RDONLY)
305 return ERR_PTR(-EROFS);
306
617ba13b 307 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 308 handle = ext4_journal_current_handle();
309
310 /*
311 * If a handle has been started, it should be allowed to
312 * finish, otherwise deadlock could happen between freeze
313 * and others(e.g. truncate) due to the restart of the
314 * journal handle if the filesystem is forzen and active
315 * handles are not stopped.
316 */
317 if (!handle)
318 vfs_check_frozen(sb, SB_FREEZE_TRANS);
319
320 if (!journal)
321 return ext4_get_nojournal();
322 /*
323 * Special case here: if the journal has aborted behind our
324 * backs (eg. EIO in the commit thread), then we still need to
325 * take the FS itself readonly cleanly.
326 */
327 if (is_journal_aborted(journal)) {
328 ext4_abort(sb, "Detected aborted journal");
329 return ERR_PTR(-EROFS);
ac27a0ec 330 }
be4f27d3 331 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 332}
333
334/*
335 * The only special thing we need to do here is to make sure that all
dab291af 336 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 337 * that sync() will call the filesystem's write_super callback if
338 * appropriate.
339 */
c398eda0 340int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 341{
342 struct super_block *sb;
343 int err;
344 int rc;
345
0390131b 346 if (!ext4_handle_valid(handle)) {
d3d1faf6 347 ext4_put_nojournal(handle);
0390131b
FM		 348 return 0;
349 }
ac27a0ec
DK		 350 sb = handle->h_transaction->t_journal->j_private;
351 err = handle->h_err;
dab291af 352 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 353
354 if (!err)
355 err = rc;
356 if (err)
c398eda0 357 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 358 return err;
359}
360
90c7201b
TT		 361void ext4_journal_abort_handle(const char *caller, unsigned int line,
362 const char *err_fn, struct buffer_head *bh,
363 handle_t *handle, int err)
ac27a0ec
DK		 364{
365 char nbuf[16];
617ba13b 366 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 367
0390131b
FM		 368 BUG_ON(!ext4_handle_valid(handle));
369
ac27a0ec
DK		 370 if (bh)
371 BUFFER_TRACE(bh, "abort");
372
373 if (!handle->h_err)
374 handle->h_err = err;
375
376 if (is_handle_aborted(handle))
377 return;
378
92b97816 379 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 380 caller, line, errstr, err_fn);
ac27a0ec 381
dab291af 382 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 383}
384
1c13d5c0
TT		 385static void __save_error_info(struct super_block *sb, const char *func,
386 unsigned int line)
387{
388 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
389
390 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
391 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
392 es->s_last_error_time = cpu_to_le32(get_seconds());
393 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
394 es->s_last_error_line = cpu_to_le32(line);
395 if (!es->s_first_error_time) {
396 es->s_first_error_time = es->s_last_error_time;
397 strncpy(es->s_first_error_func, func,
398 sizeof(es->s_first_error_func));
399 es->s_first_error_line = cpu_to_le32(line);
400 es->s_first_error_ino = es->s_last_error_ino;
401 es->s_first_error_block = es->s_last_error_block;
402 }
66e61a9e
TT		 403 /*
404 * Start the daily error reporting function if it hasn't been
405 * started already
406 */
407 if (!es->s_error_count)
408 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 409 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
410}
411
412static void save_error_info(struct super_block *sb, const char *func,
413 unsigned int line)
414{
415 __save_error_info(sb, func, line);
416 ext4_commit_super(sb, 1);
417}
418
7c2e7087
TT		 419/*
420 * The del_gendisk() function uninitializes the disk-specific data
421 * structures, including the bdi structure, without telling anyone
422 * else. Once this happens, any attempt to call mark_buffer_dirty()
423 * (for example, by ext4_commit_super), will cause a kernel OOPS.
424 * This is a kludge to prevent these oops until we can put in a proper
425 * hook in del_gendisk() to inform the VFS and file system layers.
426 */
427static int block_device_ejected(struct super_block *sb)
428{
429 struct inode *bd_inode = sb->s_bdev->bd_inode;
430 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
431
432 return bdi->dev == NULL;
433}
434
18aadd47
BJ		 435static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
436{
437 struct super_block *sb = journal->j_private;
438 struct ext4_sb_info *sbi = EXT4_SB(sb);
439 int error = is_journal_aborted(journal);
440 struct ext4_journal_cb_entry *jce, *tmp;
441
442 spin_lock(&sbi->s_md_lock);
443 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
444 list_del_init(&jce->jce_list);
445 spin_unlock(&sbi->s_md_lock);
446 jce->jce_func(sb, jce, error);
447 spin_lock(&sbi->s_md_lock);
448 }
449 spin_unlock(&sbi->s_md_lock);
450}
1c13d5c0 451
ac27a0ec
DK		 452/* Deal with the reporting of failure conditions on a filesystem such as
453 * inconsistencies detected or read IO failures.
454 *
455 * On ext2, we can store the error state of the filesystem in the
617ba13b 456 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 457 * write ordering constraints on the superblock which prevent us from
458 * writing it out straight away; and given that the journal is about to
459 * be aborted, we can't rely on the current, or future, transactions to
460 * write out the superblock safely.
461 *
dab291af 462 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 463 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 464 * that error until we've noted it down and cleared it.
465 */
466
617ba13b 467static void ext4_handle_error(struct super_block *sb)
ac27a0ec 468{
ac27a0ec
DK		 469 if (sb->s_flags & MS_RDONLY)
470 return;
471
2b2d6d01 472 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 473 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 474
4ab2f15b 475 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 476 if (journal)
dab291af 477 jbd2_journal_abort(journal, -EIO);
ac27a0ec 478 }
2b2d6d01 479 if (test_opt(sb, ERRORS_RO)) {
b31e1552 480 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 481 sb->s_flags |= MS_RDONLY;
482 }
ac27a0ec 483 if (test_opt(sb, ERRORS_PANIC))
617ba13b 484 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 485 sb->s_id);
486}
487
12062ddd 488void __ext4_error(struct super_block *sb, const char *function,
c398eda0 489 unsigned int line, const char *fmt, ...)
ac27a0ec 490{
0ff2ea7d 491 struct va_format vaf;
ac27a0ec
DK		 492 va_list args;
493
494 va_start(args, fmt);
0ff2ea7d
JP		 495 vaf.fmt = fmt;
496 vaf.va = &args;
497 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
498 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 499 va_end(args);
500
617ba13b 501 ext4_handle_error(sb);
ac27a0ec
DK		 502}
503
c398eda0
TT		 504void ext4_error_inode(struct inode *inode, const char *function,
505 unsigned int line, ext4_fsblk_t block,
273df556
FM		 506 const char *fmt, ...)
507{
508 va_list args;
f7c21177 509 struct va_format vaf;
1c13d5c0 510 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 511
1c13d5c0
TT		 512 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
513 es->s_last_error_block = cpu_to_le64(block);
514 save_error_info(inode->i_sb, function, line);
273df556 515 va_start(args, fmt);
f7c21177
TT		 516 vaf.fmt = fmt;
517 vaf.va = &args;
c398eda0 518 if (block)
d9ee81da
JP		 519 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
520 "inode #%lu: block %llu: comm %s: %pV\n",
521 inode->i_sb->s_id, function, line, inode->i_ino,
522 block, current->comm, &vaf);
523 else
524 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
525 "inode #%lu: comm %s: %pV\n",
526 inode->i_sb->s_id, function, line, inode->i_ino,
527 current->comm, &vaf);
273df556
FM		 528 va_end(args);
529
530 ext4_handle_error(inode->i_sb);
531}
532
c398eda0 533void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 534 unsigned int line, ext4_fsblk_t block,
535 const char *fmt, ...)
273df556
FM		 536{
537 va_list args;
f7c21177 538 struct va_format vaf;
1c13d5c0 539 struct ext4_super_block *es;
273df556
FM		 540 struct inode *inode = file->f_dentry->d_inode;
541 char pathname[80], *path;
542
1c13d5c0
TT		 543 es = EXT4_SB(inode->i_sb)->s_es;
544 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
545 save_error_info(inode->i_sb, function, line);
273df556 546 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 547 if (IS_ERR(path))
273df556 548 path = "(unknown)";
f7c21177
TT		 549 va_start(args, fmt);
550 vaf.fmt = fmt;
551 vaf.va = &args;
d9ee81da
JP		 552 if (block)
553 printk(KERN_CRIT
554 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
555 "block %llu: comm %s: path %s: %pV\n",
556 inode->i_sb->s_id, function, line, inode->i_ino,
557 block, current->comm, path, &vaf);
558 else
559 printk(KERN_CRIT
560 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
561 "comm %s: path %s: %pV\n",
562 inode->i_sb->s_id, function, line, inode->i_ino,
563 current->comm, path, &vaf);
273df556
FM		 564 va_end(args);
565
566 ext4_handle_error(inode->i_sb);
567}
568
2b2d6d01 569static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 570 char nbuf[16])
571{
572 char *errstr = NULL;
573
574 switch (errno) {
575 case -EIO:
576 errstr = "IO failure";
577 break;
578 case -ENOMEM:
579 errstr = "Out of memory";
580 break;
581 case -EROFS:
78f1ddbb
TT		 582 if (!sb || (EXT4_SB(sb)->s_journal &&
583 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 584 errstr = "Journal has aborted";
585 else
586 errstr = "Readonly filesystem";
587 break;
588 default:
589 /* If the caller passed in an extra buffer for unknown
590 * errors, textualise them now. Else we just return
591 * NULL. */
592 if (nbuf) {
593 /* Check for truncated error codes... */
594 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
595 errstr = nbuf;
596 }
597 break;
598 }
599
600 return errstr;
601}
602
617ba13b 603/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 604 * automatically and invokes the appropriate error response. */
605
c398eda0
TT		 606void __ext4_std_error(struct super_block *sb, const char *function,
607 unsigned int line, int errno)
ac27a0ec
DK		 608{
609 char nbuf[16];
610 const char *errstr;
611
612 /* Special case: if the error is EROFS, and we're not already
613 * inside a transaction, then there's really no point in logging
614 * an error. */
615 if (errno == -EROFS && journal_current_handle() == NULL &&
616 (sb->s_flags & MS_RDONLY))
617 return;
618
617ba13b 619 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 620 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
621 sb->s_id, function, line, errstr);
1c13d5c0 622 save_error_info(sb, function, line);
ac27a0ec 623
617ba13b 624 ext4_handle_error(sb);
ac27a0ec
DK		 625}
626
627/*
617ba13b 628 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 629 * abort function may be used to deal with unrecoverable failures such
630 * as journal IO errors or ENOMEM at a critical moment in log management.
631 *
632 * We unconditionally force the filesystem into an ABORT|READONLY state,
633 * unless the error response on the fs has been set to panic in which
634 * case we take the easy way out and panic immediately.
635 */
636
c67d859e 637void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 638 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 639{
640 va_list args;
641
1c13d5c0 642 save_error_info(sb, function, line);
ac27a0ec 643 va_start(args, fmt);
c398eda0
TT		 644 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
645 function, line);
ac27a0ec
DK		 646 vprintk(fmt, args);
647 printk("\n");
648 va_end(args);
649
1c13d5c0
TT		 650 if ((sb->s_flags & MS_RDONLY) == 0) {
651 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
652 sb->s_flags |= MS_RDONLY;
653 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
654 if (EXT4_SB(sb)->s_journal)
655 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
656 save_error_info(sb, function, line);
657 }
ac27a0ec 658 if (test_opt(sb, ERRORS_PANIC))
617ba13b 659 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 660}
661
0ff2ea7d 662void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 663{
0ff2ea7d 664 struct va_format vaf;
b31e1552
ES		 665 va_list args;
666
667 va_start(args, fmt);
0ff2ea7d
JP		 668 vaf.fmt = fmt;
669 vaf.va = &args;
670 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 671 va_end(args);
672}
673
12062ddd 674void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 675 unsigned int line, const char *fmt, ...)
ac27a0ec 676{
0ff2ea7d 677 struct va_format vaf;
ac27a0ec
DK		 678 va_list args;
679
680 va_start(args, fmt);
0ff2ea7d
JP		 681 vaf.fmt = fmt;
682 vaf.va = &args;
683 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
684 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 685 va_end(args);
686}
687
e29136f8
TT		 688void __ext4_grp_locked_error(const char *function, unsigned int line,
689 struct super_block *sb, ext4_group_t grp,
690 unsigned long ino, ext4_fsblk_t block,
691 const char *fmt, ...)
5d1b1b3f
AK		 692__releases(bitlock)
693__acquires(bitlock)
694{
0ff2ea7d 695 struct va_format vaf;
5d1b1b3f
AK		 696 va_list args;
697 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
698
1c13d5c0
TT		 699 es->s_last_error_ino = cpu_to_le32(ino);
700 es->s_last_error_block = cpu_to_le64(block);
701 __save_error_info(sb, function, line);
0ff2ea7d 702
5d1b1b3f 703 va_start(args, fmt);
0ff2ea7d
JP		 704
705 vaf.fmt = fmt;
706 vaf.va = &args;
21149d61 707 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 708 sb->s_id, function, line, grp);
709 if (ino)
0ff2ea7d 710 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 711 if (block)
0ff2ea7d
JP		 712 printk(KERN_CONT "block %llu:", (unsigned long long) block);
713 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 714 va_end(args);
715
716 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 717 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 718 return;
719 }
1c13d5c0 720
5d1b1b3f
AK		 721 ext4_unlock_group(sb, grp);
722 ext4_handle_error(sb);
723 /*
724 * We only get here in the ERRORS_RO case; relocking the group
725 * may be dangerous, but nothing bad will happen since the
726 * filesystem will have already been marked read/only and the
727 * journal has been aborted. We return 1 as a hint to callers
728 * who might what to use the return value from
25985edc 729 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 730 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
731 * aggressively from the ext4 function in question, with a
732 * more appropriate error code.
733 */
734 ext4_lock_group(sb, grp);
735 return;
736}
737
617ba13b 738void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 739{
617ba13b 740 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 741
617ba13b 742 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 743 return;
744
12062ddd 745 ext4_warning(sb,
ac27a0ec
DK		 746 "updating to rev %d because of new feature flag, "
747 "running e2fsck is recommended",
617ba13b 748 EXT4_DYNAMIC_REV);
ac27a0ec 749
617ba13b
MC		 750 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
751 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
752 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 753 /* leave es->s_feature_*compat flags alone */
754 /* es->s_uuid will be set by e2fsck if empty */
755
756 /*
757 * The rest of the superblock fields should be zero, and if not it
758 * means they are likely already in use, so leave them alone. We
759 * can leave it up to e2fsck to clean up any inconsistencies there.
760 */
761}
762
763/*
764 * Open the external journal device
765 */
b31e1552 766static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 767{
768 struct block_device *bdev;
769 char b[BDEVNAME_SIZE];
770
d4d77629 771 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 772 if (IS_ERR(bdev))
773 goto fail;
774 return bdev;
775
776fail:
b31e1552 777 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 778 __bdevname(dev, b), PTR_ERR(bdev));
779 return NULL;
780}
781
782/*
783 * Release the journal device
784 */
617ba13b 785static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 786{
e525fd89 787 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 788}
789
617ba13b 790static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 791{
792 struct block_device *bdev;
793 int ret = -ENODEV;
794
795 bdev = sbi->journal_bdev;
796 if (bdev) {
617ba13b 797 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 798 sbi->journal_bdev = NULL;
799 }
800 return ret;
801}
802
803static inline struct inode *orphan_list_entry(struct list_head *l)
804{
617ba13b 805 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 806}
807
617ba13b 808static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 809{
810 struct list_head *l;
811
b31e1552
ES		 812 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
813 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 814
815 printk(KERN_ERR "sb_info orphan list:\n");
816 list_for_each(l, &sbi->s_orphan) {
817 struct inode *inode = orphan_list_entry(l);
818 printk(KERN_ERR " "
819 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
820 inode->i_sb->s_id, inode->i_ino, inode,
821 inode->i_mode, inode->i_nlink,
822 NEXT_ORPHAN(inode));
823 }
824}
825
2b2d6d01 826static void ext4_put_super(struct super_block *sb)
ac27a0ec 827{
617ba13b
MC		 828 struct ext4_sb_info *sbi = EXT4_SB(sb);
829 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 830 int i, err;
ac27a0ec 831
857ac889 832 ext4_unregister_li_request(sb);
e0ccfd95
CH		 833 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
834
4c0425ff
MC		 835 flush_workqueue(sbi->dio_unwritten_wq);
836 destroy_workqueue(sbi->dio_unwritten_wq);
837
a9e220f8 838 lock_super(sb);
0390131b
FM		 839 if (sbi->s_journal) {
840 err = jbd2_journal_destroy(sbi->s_journal);
841 sbi->s_journal = NULL;
842 if (err < 0)
c67d859e 843 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 844 }
d4edac31 845
a1c6c569 846 del_timer(&sbi->s_err_report);
d4edac31
JB		 847 ext4_release_system_zone(sb);
848 ext4_mb_release(sb);
849 ext4_ext_release(sb);
850 ext4_xattr_put_super(sb);
851
ac27a0ec 852 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 853 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 854 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 855 }
a8e25a83
AB		 856 if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
857 ext4_commit_super(sb, 1);
858
240799cd 859 if (sbi->s_proc) {
66acdcf4 860 remove_proc_entry("options", sbi->s_proc);
9f6200bb 861 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 862 }
3197ebdb 863 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 864
865 for (i = 0; i < sbi->s_gdb_count; i++)
866 brelse(sbi->s_group_desc[i]);
f18a5f21 867 ext4_kvfree(sbi->s_group_desc);
9933fc0a 868 ext4_kvfree(sbi->s_flex_groups);
57042651 869 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 870 percpu_counter_destroy(&sbi->s_freeinodes_counter);
871 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 872 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 873 brelse(sbi->s_sbh);
874#ifdef CONFIG_QUOTA
875 for (i = 0; i < MAXQUOTAS; i++)
876 kfree(sbi->s_qf_names[i]);
877#endif
878
879 /* Debugging code just in case the in-memory inode orphan list
880 * isn't empty. The on-disk one can be non-empty if we've
881 * detected an error and taken the fs readonly, but the
882 * in-memory list had better be clean by this point. */
883 if (!list_empty(&sbi->s_orphan))
884 dump_orphan_list(sb, sbi);
885 J_ASSERT(list_empty(&sbi->s_orphan));
886
f98393a6 887 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 888 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
889 /*
890 * Invalidate the journal device's buffers. We don't want them
891 * floating about in memory - the physical journal device may
892 * hotswapped, and it breaks the `ro-after' testing code.
893 */
894 sync_blockdev(sbi->journal_bdev);
f98393a6 895 invalidate_bdev(sbi->journal_bdev);
617ba13b 896 ext4_blkdev_remove(sbi);
ac27a0ec 897 }
c5e06d10
JL		 898 if (sbi->s_mmp_tsk)
899 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 900 sb->s_fs_info = NULL;
3197ebdb
TT		 901 /*
902 * Now that we are completely done shutting down the
903 * superblock, we need to actually destroy the kobject.
904 */
3197ebdb
TT		 905 unlock_super(sb);
906 kobject_put(&sbi->s_kobj);
907 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 908 kfree(sbi->s_blockgroup_lock);
ac27a0ec 909 kfree(sbi);
ac27a0ec
DK		 910}
911
e18b890b 912static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 913
914/*
915 * Called inside transaction, so use GFP_NOFS
916 */
617ba13b 917static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 918{
617ba13b 919 struct ext4_inode_info *ei;
ac27a0ec 920
e6b4f8da 921 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 922 if (!ei)
923 return NULL;
0b8e58a1 924
ac27a0ec 925 ei->vfs_inode.i_version = 1;
91246c00 926 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 927 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 928 INIT_LIST_HEAD(&ei->i_prealloc_list);
929 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 930 ei->i_reserved_data_blocks = 0;
931 ei->i_reserved_meta_blocks = 0;
932 ei->i_allocated_meta_blocks = 0;
9d0be502 933 ei->i_da_metadata_calc_len = 0;
d2a17637 934 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 935#ifdef CONFIG_QUOTA
936 ei->i_reserved_quota = 0;
937#endif
8aefcd55 938 ei->jinode = NULL;
c7064ef1 939 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 940 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 941 ei->cur_aio_dio = NULL;
b436b9be
JK		 942 ei->i_sync_tid = 0;
943 ei->i_datasync_tid = 0;
f7ad6d2e 944 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 945 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 946
ac27a0ec
DK		 947 return &ei->vfs_inode;
948}
949
7ff9c073
TT		 950static int ext4_drop_inode(struct inode *inode)
951{
952 int drop = generic_drop_inode(inode);
953
954 trace_ext4_drop_inode(inode, drop);
955 return drop;
956}
957
fa0d7e3d
NP		 958static void ext4_i_callback(struct rcu_head *head)
959{
960 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 961 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
962}
963
617ba13b 964static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 965{
9f7dd93d 966 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 967 ext4_msg(inode->i_sb, KERN_ERR,
968 "Inode %lu (%p): orphan list check failed!",
969 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 970 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
971 EXT4_I(inode), sizeof(struct ext4_inode_info),
972 true);
973 dump_stack();
974 }
fa0d7e3d 975 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 976}
977
51cc5068 978static void init_once(void *foo)
ac27a0ec 979{
617ba13b 980 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 981
a35afb83 982 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 983#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 984 init_rwsem(&ei->xattr_sem);
ac27a0ec 985#endif
0e855ac8 986 init_rwsem(&ei->i_data_sem);
a35afb83 987 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 988}
989
990static int init_inodecache(void)
991{
617ba13b
MC		 992 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
993 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 994 0, (SLAB_RECLAIM_ACCOUNT|
995 SLAB_MEM_SPREAD),
20c2df83 996 init_once);
617ba13b 997 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 998 return -ENOMEM;
999 return 0;
1000}
1001
1002static void destroy_inodecache(void)
1003{
617ba13b 1004 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1005}
1006
0930fcc1 1007void ext4_clear_inode(struct inode *inode)
ac27a0ec 1008{
0930fcc1
AV		 1009 invalidate_inode_buffers(inode);
1010 end_writeback(inode);
9f754758 1011 dquot_drop(inode);
c2ea3fde 1012 ext4_discard_preallocations(inode);
8aefcd55
TT		 1013 if (EXT4_I(inode)->jinode) {
1014 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1015 EXT4_I(inode)->jinode);
1016 jbd2_free_inode(EXT4_I(inode)->jinode);
1017 EXT4_I(inode)->jinode = NULL;
1018 }
ac27a0ec
DK		 1019}
1020
1b961ac0 1021static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1022 u64 ino, u32 generation)
ac27a0ec 1023{
ac27a0ec 1024 struct inode *inode;
ac27a0ec 1025
617ba13b 1026 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1027 return ERR_PTR(-ESTALE);
617ba13b 1028 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1029 return ERR_PTR(-ESTALE);
1030
1031 /* iget isn't really right if the inode is currently unallocated!!
1032 *
617ba13b 1033 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1034 * deleted, so we should be safe.
1035 *
1036 * Currently we don't know the generation for parent directory, so
1037 * a generation of 0 means "accept any"
1038 */
1d1fe1ee
DH		 1039 inode = ext4_iget(sb, ino);
1040 if (IS_ERR(inode))
1041 return ERR_CAST(inode);
1042 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1043 iput(inode);
1044 return ERR_PTR(-ESTALE);
1045 }
1b961ac0
CH		 1046
1047 return inode;
1048}
1049
1050static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1051 int fh_len, int fh_type)
1b961ac0
CH		 1052{
1053 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1054 ext4_nfs_get_inode);
1055}
1056
1057static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1058 int fh_len, int fh_type)
1b961ac0
CH		 1059{
1060 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1061 ext4_nfs_get_inode);
ac27a0ec
DK		 1062}
1063
c39a7f84
TO		 1064/*
1065 * Try to release metadata pages (indirect blocks, directories) which are
1066 * mapped via the block device. Since these pages could have journal heads
1067 * which would prevent try_to_free_buffers() from freeing them, we must use
1068 * jbd2 layer's try_to_free_buffers() function to release them.
1069 */
0b8e58a1
AD		 1070static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1071 gfp_t wait)
c39a7f84
TO		 1072{
1073 journal_t *journal = EXT4_SB(sb)->s_journal;
1074
1075 WARN_ON(PageChecked(page));
1076 if (!page_has_buffers(page))
1077 return 0;
1078 if (journal)
1079 return jbd2_journal_try_to_free_buffers(journal, page,
1080 wait & ~__GFP_WAIT);
1081 return try_to_free_buffers(page);
1082}
1083
ac27a0ec 1084#ifdef CONFIG_QUOTA
af5bc92d 1085#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1086#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1087
617ba13b
MC		 1088static int ext4_write_dquot(struct dquot *dquot);
1089static int ext4_acquire_dquot(struct dquot *dquot);
1090static int ext4_release_dquot(struct dquot *dquot);
1091static int ext4_mark_dquot_dirty(struct dquot *dquot);
1092static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1093static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1094 struct path *path);
ca0e05e4 1095static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1096static int ext4_quota_on_mount(struct super_block *sb, int type);
1097static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1098 size_t len, loff_t off);
617ba13b 1099static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1100 const char *data, size_t len, loff_t off);
1101
61e225dc 1102static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1103 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1104 .write_dquot = ext4_write_dquot,
1105 .acquire_dquot = ext4_acquire_dquot,
1106 .release_dquot = ext4_release_dquot,
1107 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1108 .write_info = ext4_write_info,
1109 .alloc_dquot = dquot_alloc,
1110 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1111};
1112
0d54b217 1113static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1114 .quota_on = ext4_quota_on,
ca0e05e4 1115 .quota_off = ext4_quota_off,
287a8095
CH		 1116 .quota_sync = dquot_quota_sync,
1117 .get_info = dquot_get_dqinfo,
1118 .set_info = dquot_set_dqinfo,
1119 .get_dqblk = dquot_get_dqblk,
1120 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1121};
1122#endif
1123
ee9b6d61 1124static const struct super_operations ext4_sops = {
617ba13b
MC		 1125 .alloc_inode = ext4_alloc_inode,
1126 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1127 .write_inode = ext4_write_inode,
1128 .dirty_inode = ext4_dirty_inode,
7ff9c073 1129 .drop_inode = ext4_drop_inode,
0930fcc1 1130 .evict_inode = ext4_evict_inode,
617ba13b 1131 .put_super = ext4_put_super,
617ba13b 1132 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1133 .freeze_fs = ext4_freeze,
1134 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1135 .statfs = ext4_statfs,
1136 .remount_fs = ext4_remount,
617ba13b 1137 .show_options = ext4_show_options,
ac27a0ec 1138#ifdef CONFIG_QUOTA
617ba13b
MC		 1139 .quota_read = ext4_quota_read,
1140 .quota_write = ext4_quota_write,
ac27a0ec 1141#endif
c39a7f84 1142 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1143};
1144
9ca92389
TT		 1145static const struct super_operations ext4_nojournal_sops = {
1146 .alloc_inode = ext4_alloc_inode,
1147 .destroy_inode = ext4_destroy_inode,
1148 .write_inode = ext4_write_inode,
1149 .dirty_inode = ext4_dirty_inode,
7ff9c073 1150 .drop_inode = ext4_drop_inode,
0930fcc1 1151 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1152 .write_super = ext4_write_super,
1153 .put_super = ext4_put_super,
1154 .statfs = ext4_statfs,
1155 .remount_fs = ext4_remount,
9ca92389
TT		 1156 .show_options = ext4_show_options,
1157#ifdef CONFIG_QUOTA
1158 .quota_read = ext4_quota_read,
1159 .quota_write = ext4_quota_write,
1160#endif
1161 .bdev_try_to_free_page = bdev_try_to_free_page,
1162};
1163
39655164 1164static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1165 .fh_to_dentry = ext4_fh_to_dentry,
1166 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1167 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1168};
1169
1170enum {
1171 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1172 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1173 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1174 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1175 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1176 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1177 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1178 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1179 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1180 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1181 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1182 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1183 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1184 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1185 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1186 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1187 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1188 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1189};
1190
a447c093 1191static const match_table_t tokens = {
ac27a0ec
DK		 1192 {Opt_bsd_df, "bsddf"},
1193 {Opt_minix_df, "minixdf"},
1194 {Opt_grpid, "grpid"},
1195 {Opt_grpid, "bsdgroups"},
1196 {Opt_nogrpid, "nogrpid"},
1197 {Opt_nogrpid, "sysvgroups"},
1198 {Opt_resgid, "resgid=%u"},
1199 {Opt_resuid, "resuid=%u"},
1200 {Opt_sb, "sb=%u"},
1201 {Opt_err_cont, "errors=continue"},
1202 {Opt_err_panic, "errors=panic"},
1203 {Opt_err_ro, "errors=remount-ro"},
1204 {Opt_nouid32, "nouid32"},
ac27a0ec 1205 {Opt_debug, "debug"},
72578c33
TT		 1206 {Opt_removed, "oldalloc"},
1207 {Opt_removed, "orlov"},
ac27a0ec
DK		 1208 {Opt_user_xattr, "user_xattr"},
1209 {Opt_nouser_xattr, "nouser_xattr"},
1210 {Opt_acl, "acl"},
1211 {Opt_noacl, "noacl"},
e3bb52ae 1212 {Opt_noload, "norecovery"},
5a916be1 1213 {Opt_noload, "noload"},
72578c33
TT		 1214 {Opt_removed, "nobh"},
1215 {Opt_removed, "bh"},
ac27a0ec 1216 {Opt_commit, "commit=%u"},
30773840
TT		 1217 {Opt_min_batch_time, "min_batch_time=%u"},
1218 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1219 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1220 {Opt_journal_checksum, "journal_checksum"},
1221 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1222 {Opt_abort, "abort"},
1223 {Opt_data_journal, "data=journal"},
1224 {Opt_data_ordered, "data=ordered"},
1225 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1226 {Opt_data_err_abort, "data_err=abort"},
1227 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1228 {Opt_offusrjquota, "usrjquota="},
1229 {Opt_usrjquota, "usrjquota=%s"},
1230 {Opt_offgrpjquota, "grpjquota="},
1231 {Opt_grpjquota, "grpjquota=%s"},
1232 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1233 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1234 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1235 {Opt_grpquota, "grpquota"},
1236 {Opt_noquota, "noquota"},
1237 {Opt_quota, "quota"},
1238 {Opt_usrquota, "usrquota"},
1239 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1240 {Opt_barrier, "barrier"},
1241 {Opt_nobarrier, "nobarrier"},
25ec56b5 1242 {Opt_i_version, "i_version"},
c9de560d 1243 {Opt_stripe, "stripe=%u"},
64769240 1244 {Opt_delalloc, "delalloc"},
dd919b98 1245 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1246 {Opt_mblk_io_submit, "mblk_io_submit"},
1247 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1248 {Opt_block_validity, "block_validity"},
1249 {Opt_noblock_validity, "noblock_validity"},
240799cd 1250 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1251 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1252 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1253 {Opt_auto_da_alloc, "auto_da_alloc"},
1254 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1255 {Opt_dioread_nolock, "dioread_nolock"},
1256 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1257 {Opt_discard, "discard"},
1258 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1259 {Opt_init_itable, "init_itable=%u"},
1260 {Opt_init_itable, "init_itable"},
1261 {Opt_noinit_itable, "noinit_itable"},
c7198b9c
TT		 1262 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1263 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1264 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1265 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1266 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1267 {Opt_err, NULL},
ac27a0ec
DK		 1268};
1269
617ba13b 1270static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1271{
617ba13b 1272 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1273 char *options = (char *) *data;
1274
1275 if (!options || strncmp(options, "sb=", 3) != 0)
1276 return 1; /* Default location */
0b8e58a1 1277
ac27a0ec 1278 options += 3;
0b8e58a1 1279 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1280 sb_block = simple_strtoul(options, &options, 0);
1281 if (*options && *options != ',') {
4776004f 1282 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1283 (char *) *data);
1284 return 1;
1285 }
1286 if (*options == ',')
1287 options++;
1288 *data = (void *) options;
0b8e58a1 1289
ac27a0ec
DK		 1290 return sb_block;
1291}
1292
b3881f74 1293#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1294static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1295 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1296
56c50f11
DM		 1297#ifdef CONFIG_QUOTA
1298static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1299{
1300 struct ext4_sb_info *sbi = EXT4_SB(sb);
1301 char *qname;
1302
1303 if (sb_any_quota_loaded(sb) &&
1304 !sbi->s_qf_names[qtype]) {
1305 ext4_msg(sb, KERN_ERR,
1306 "Cannot change journaled "
1307 "quota options when quota turned on");
57f73c2c 1308 return -1;
56c50f11
DM		 1309 }
1310 qname = match_strdup(args);
1311 if (!qname) {
1312 ext4_msg(sb, KERN_ERR,
1313 "Not enough memory for storing quotafile name");
57f73c2c 1314 return -1;
56c50f11
DM		 1315 }
1316 if (sbi->s_qf_names[qtype] &&
1317 strcmp(sbi->s_qf_names[qtype], qname)) {
1318 ext4_msg(sb, KERN_ERR,
1319 "%s quota file already specified", QTYPE2NAME(qtype));
1320 kfree(qname);
57f73c2c 1321 return -1;
56c50f11
DM		 1322 }
1323 sbi->s_qf_names[qtype] = qname;
1324 if (strchr(sbi->s_qf_names[qtype], '/')) {
1325 ext4_msg(sb, KERN_ERR,
1326 "quotafile must be on filesystem root");
1327 kfree(sbi->s_qf_names[qtype]);
1328 sbi->s_qf_names[qtype] = NULL;
57f73c2c 1329 return -1;
56c50f11 1330 }
fd8c37ec 1331 set_opt(sb, QUOTA);
56c50f11
DM		 1332 return 1;
1333}
1334
1335static int clear_qf_name(struct super_block *sb, int qtype)
1336{
1337
1338 struct ext4_sb_info *sbi = EXT4_SB(sb);
1339
1340 if (sb_any_quota_loaded(sb) &&
1341 sbi->s_qf_names[qtype]) {
1342 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1343 " when quota turned on");
57f73c2c 1344 return -1;
56c50f11
DM		 1345 }
1346 /*
1347 * The space will be released later when all options are confirmed
1348 * to be correct
1349 */
1350 sbi->s_qf_names[qtype] = NULL;
1351 return 1;
1352}
1353#endif
1354
26092bf5
TT		 1355#define MOPT_SET 0x0001
1356#define MOPT_CLEAR 0x0002
1357#define MOPT_NOSUPPORT 0x0004
1358#define MOPT_EXPLICIT 0x0008
1359#define MOPT_CLEAR_ERR 0x0010
1360#define MOPT_GTE0 0x0020
ac27a0ec 1361#ifdef CONFIG_QUOTA
26092bf5
TT		 1362#define MOPT_Q 0
1363#define MOPT_QFMT 0x0040
1364#else
1365#define MOPT_Q MOPT_NOSUPPORT
1366#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1367#endif
26092bf5
TT		 1368#define MOPT_DATAJ 0x0080
1369
1370static const struct mount_opts {
1371 int token;
1372 int mount_opt;
1373 int flags;
1374} ext4_mount_opts[] = {
1375 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1376 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1377 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1378 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1379 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1380 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1381 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1382 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1383 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1384 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1385 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1386 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1387 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1388 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1389 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1390 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1391 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1392 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1393 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1394 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1395 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1396 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1397 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1398 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1399 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1400 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1401 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1402 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1403 {Opt_commit, 0, MOPT_GTE0},
1404 {Opt_max_batch_time, 0, MOPT_GTE0},
1405 {Opt_min_batch_time, 0, MOPT_GTE0},
1406 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1407 {Opt_init_itable, 0, MOPT_GTE0},
1408 {Opt_stripe, 0, MOPT_GTE0},
1409 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1410 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1411 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1412#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1413 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1414 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1415#else
26092bf5
TT		 1416 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1417 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1418#endif
03010a33 1419#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1420 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1421 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1422#else
26092bf5
TT		 1423 {Opt_acl, 0, MOPT_NOSUPPORT},
1424 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1425#endif
26092bf5
TT		 1426 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1427 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1428 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1429 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1430 MOPT_SET | MOPT_Q},
1431 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1432 MOPT_SET | MOPT_Q},
1433 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1434 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1435 {Opt_usrjquota, 0, MOPT_Q},
1436 {Opt_grpjquota, 0, MOPT_Q},
1437 {Opt_offusrjquota, 0, MOPT_Q},
1438 {Opt_offgrpjquota, 0, MOPT_Q},
1439 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1440 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1441 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1442 {Opt_err, 0, 0}
1443};
1444
1445static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1446 substring_t *args, unsigned long *journal_devnum,
1447 unsigned int *journal_ioprio, int is_remount)
1448{
1449 struct ext4_sb_info *sbi = EXT4_SB(sb);
1450 const struct mount_opts *m;
1451 int arg = 0;
1452
57f73c2c
TT		 1453#ifdef CONFIG_QUOTA
1454 if (token == Opt_usrjquota)
1455 return set_qf_name(sb, USRQUOTA, &args[0]);
1456 else if (token == Opt_grpjquota)
1457 return set_qf_name(sb, GRPQUOTA, &args[0]);
1458 else if (token == Opt_offusrjquota)
1459 return clear_qf_name(sb, USRQUOTA);
1460 else if (token == Opt_offgrpjquota)
1461 return clear_qf_name(sb, GRPQUOTA);
1462#endif
26092bf5
TT		 1463 if (args->from && match_int(args, &arg))
1464 return -1;
1465 switch (token) {
f7048605
TT		 1466 case Opt_noacl:
1467 case Opt_nouser_xattr:
1468 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1469 break;
26092bf5
TT		 1470 case Opt_sb:
1471 return 1; /* handled by get_sb_block() */
1472 case Opt_removed:
1473 ext4_msg(sb, KERN_WARNING,
1474 "Ignoring removed %s option", opt);
1475 return 1;
1476 case Opt_resuid:
1477 sbi->s_resuid = arg;
1478 return 1;
1479 case Opt_resgid:
1480 sbi->s_resgid = arg;
1481 return 1;
1482 case Opt_abort:
1483 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1484 return 1;
1485 case Opt_i_version:
1486 sb->s_flags |= MS_I_VERSION;
1487 return 1;
1488 case Opt_journal_dev:
1489 if (is_remount) {
1490 ext4_msg(sb, KERN_ERR,
1491 "Cannot specify journal on remount");
1492 return -1;
1493 }
1494 *journal_devnum = arg;
1495 return 1;
1496 case Opt_journal_ioprio:
1497 if (arg < 0 || arg > 7)
1498 return -1;
1499 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1500 return 1;
1501 }
1502
1503 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1504 if (token != m->token)
1505 continue;
1506 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1507 return -1;
1508 if (m->flags & MOPT_EXPLICIT)
1509 set_opt2(sb, EXPLICIT_DELALLOC);
1510 if (m->flags & MOPT_CLEAR_ERR)
1511 clear_opt(sb, ERRORS_MASK);
1512 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1513 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1514 "options when quota turned on");
1515 return -1;
1516 }
1517
1518 if (m->flags & MOPT_NOSUPPORT) {
1519 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1520 } else if (token == Opt_commit) {
1521 if (arg == 0)
1522 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1523 sbi->s_commit_interval = HZ * arg;
1524 } else if (token == Opt_max_batch_time) {
1525 if (arg == 0)
1526 arg = EXT4_DEF_MAX_BATCH_TIME;
1527 sbi->s_max_batch_time = arg;
1528 } else if (token == Opt_min_batch_time) {
1529 sbi->s_min_batch_time = arg;
1530 } else if (token == Opt_inode_readahead_blks) {
1531 if (arg > (1 << 30))
1532 return -1;
1533 if (arg && !is_power_of_2(arg)) {
b31e1552 1534 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1535 "EXT4-fs: inode_readahead_blks"
1536 " must be a power of 2");
1537 return -1;
ac27a0ec 1538 }
26092bf5
TT		 1539 sbi->s_inode_readahead_blks = arg;
1540 } else if (token == Opt_init_itable) {
1541 set_opt(sb, INIT_INODE_TABLE);
1542 if (!args->from)
1543 arg = EXT4_DEF_LI_WAIT_MULT;
1544 sbi->s_li_wait_mult = arg;
1545 } else if (token == Opt_stripe) {
1546 sbi->s_stripe = arg;
1547 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1548 if (is_remount) {
eb513689
TT		 1549 if (!sbi->s_journal)
1550 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1551 else if (test_opt(sb, DATA_FLAGS) !=
1552 m->mount_opt) {
b31e1552 1553 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1554 "Cannot change data mode on remount");
1555 return -1;
ac27a0ec
DK		 1556 }
1557 } else {
fd8c37ec 1558 clear_opt(sb, DATA_FLAGS);
26092bf5 1559 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1560 }
ac27a0ec 1561#ifdef CONFIG_QUOTA
26092bf5 1562 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1563 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1564 sbi->s_jquota_fmt != m->mount_opt) {
1565 ext4_msg(sb, KERN_ERR, "Cannot "
1566 "change journaled quota options "
1567 "when quota turned on");
1568 return -1;
ac27a0ec 1569 }
26092bf5 1570 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1571#endif
26092bf5
TT		 1572 } else {
1573 if (!args->from)
1574 arg = 1;
1575 if (m->flags & MOPT_CLEAR)
1576 arg = !arg;
1577 else if (unlikely(!(m->flags & MOPT_SET))) {
1578 ext4_msg(sb, KERN_WARNING,
1579 "buggy handling of option %s", opt);
1580 WARN_ON(1);
1581 return -1;
3197ebdb 1582 }
26092bf5
TT		 1583 if (arg != 0)
1584 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1585 else
26092bf5 1586 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1587 }
26092bf5
TT		 1588 return 1;
1589 }
1590 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1591 "or missing value", opt);
1592 return -1;
1593}
1594
1595static int parse_options(char *options, struct super_block *sb,
1596 unsigned long *journal_devnum,
1597 unsigned int *journal_ioprio,
1598 int is_remount)
1599{
db7e5c66 1600#ifdef CONFIG_QUOTA
26092bf5 1601 struct ext4_sb_info *sbi = EXT4_SB(sb);
db7e5c66 1602#endif
26092bf5
TT		 1603 char *p;
1604 substring_t args[MAX_OPT_ARGS];
1605 int token;
1606
1607 if (!options)
1608 return 1;
1609
1610 while ((p = strsep(&options, ",")) != NULL) {
1611 if (!*p)
1612 continue;
1613 /*
1614 * Initialize args struct so we know whether arg was
1615 * found; some options take optional arguments.
1616 */
1617 args[0].to = args[0].from = 0;
1618 token = match_token(p, tokens, args);
1619 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1620 journal_ioprio, is_remount) < 0)
1621 return 0;
ac27a0ec
DK		 1622 }
1623#ifdef CONFIG_QUOTA
1624 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1625 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1626 clear_opt(sb, USRQUOTA);
ac27a0ec 1627
482a7425 1628 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1629 clear_opt(sb, GRPQUOTA);
ac27a0ec 1630
56c50f11 1631 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1632 ext4_msg(sb, KERN_ERR, "old and new quota "
1633 "format mixing");
ac27a0ec
DK		 1634 return 0;
1635 }
1636
1637 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1638 ext4_msg(sb, KERN_ERR, "journaled quota format "
1639 "not specified");
ac27a0ec
DK		 1640 return 0;
1641 }
1642 } else {
1643 if (sbi->s_jquota_fmt) {
b31e1552 1644 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1645 "specified with no journaling "
b31e1552 1646 "enabled");
ac27a0ec
DK		 1647 return 0;
1648 }
1649 }
1650#endif
1651 return 1;
1652}
1653
2adf6da8
TT		 1654static inline void ext4_show_quota_options(struct seq_file *seq,
1655 struct super_block *sb)
1656{
1657#if defined(CONFIG_QUOTA)
1658 struct ext4_sb_info *sbi = EXT4_SB(sb);
1659
1660 if (sbi->s_jquota_fmt) {
1661 char *fmtname = "";
1662
1663 switch (sbi->s_jquota_fmt) {
1664 case QFMT_VFS_OLD:
1665 fmtname = "vfsold";
1666 break;
1667 case QFMT_VFS_V0:
1668 fmtname = "vfsv0";
1669 break;
1670 case QFMT_VFS_V1:
1671 fmtname = "vfsv1";
1672 break;
1673 }
1674 seq_printf(seq, ",jqfmt=%s", fmtname);
1675 }
1676
1677 if (sbi->s_qf_names[USRQUOTA])
1678 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1679
1680 if (sbi->s_qf_names[GRPQUOTA])
1681 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1682
1683 if (test_opt(sb, USRQUOTA))
1684 seq_puts(seq, ",usrquota");
1685
1686 if (test_opt(sb, GRPQUOTA))
1687 seq_puts(seq, ",grpquota");
1688#endif
1689}
1690
5a916be1
TT		 1691static const char *token2str(int token)
1692{
1693 static const struct match_token *t;
1694
1695 for (t = tokens; t->token != Opt_err; t++)
1696 if (t->token == token && !strchr(t->pattern, '='))
1697 break;
1698 return t->pattern;
1699}
1700
2adf6da8
TT		 1701/*
1702 * Show an option if
1703 * - it's set to a non-default value OR
1704 * - if the per-sb default is different from the global default
1705 */
66acdcf4
TT		 1706static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1707 int nodefs)
2adf6da8 1708{
2adf6da8
TT		 1709 struct ext4_sb_info *sbi = EXT4_SB(sb);
1710 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1711 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1712 const struct mount_opts *m;
66acdcf4 1713 char sep = nodefs ? '\n' : ',';
2adf6da8 1714
66acdcf4
TT		 1715#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1716#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1717
1718 if (sbi->s_sb_block != 1)
5a916be1
TT		 1719 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1720
1721 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1722 int want_set = m->flags & MOPT_SET;
1723 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1724 (m->flags & MOPT_CLEAR_ERR))
1725 continue;
66acdcf4 1726 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1727 continue; /* skip if same as the default */
1728 if ((want_set &&
1729 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1730 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1731 continue; /* select Opt_noFoo vs Opt_Foo */
1732 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1733 }
5a916be1 1734
66acdcf4 1735 if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
5a916be1
TT		 1736 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1737 SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
66acdcf4 1738 if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
5a916be1
TT		 1739 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1740 SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
66acdcf4 1741 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1742 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1743 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1744 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1745 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1746 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1747 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1748 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1749 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1750 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1751 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1752 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1753 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1754 if (sb->s_flags & MS_I_VERSION)
5a916be1 1755 SEQ_OPTS_PUTS("i_version");
66acdcf4 1756 if (nodefs || sbi->s_stripe)
5a916be1 1757 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1758 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1759 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1760 SEQ_OPTS_PUTS("data=journal");
1761 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1762 SEQ_OPTS_PUTS("data=ordered");
1763 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1764 SEQ_OPTS_PUTS("data=writeback");
1765 }
66acdcf4
TT		 1766 if (nodefs ||
1767 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1768 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1769 sbi->s_inode_readahead_blks);
2adf6da8 1770
66acdcf4
TT		 1771 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1772 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1773 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2adf6da8
TT		 1774
1775 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1776 return 0;
1777}
1778
66acdcf4
TT		 1779static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1780{
1781 return _ext4_show_options(seq, root->d_sb, 0);
1782}
1783
1784static int options_seq_show(struct seq_file *seq, void *offset)
1785{
1786 struct super_block *sb = seq->private;
1787 int rc;
1788
1789 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1790 rc = _ext4_show_options(seq, sb, 1);
1791 seq_puts(seq, "\n");
1792 return rc;
1793}
1794
1795static int options_open_fs(struct inode *inode, struct file *file)
1796{
1797 return single_open(file, options_seq_show, PDE(inode)->data);
1798}
1799
1800static const struct file_operations ext4_seq_options_fops = {
1801 .owner = THIS_MODULE,
1802 .open = options_open_fs,
1803 .read = seq_read,
1804 .llseek = seq_lseek,
1805 .release = single_release,
1806};
1807
617ba13b 1808static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1809 int read_only)
1810{
617ba13b 1811 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1812 int res = 0;
1813
617ba13b 1814 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1815 ext4_msg(sb, KERN_ERR, "revision level too high, "
1816 "forcing read-only mode");
ac27a0ec
DK		 1817 res = MS_RDONLY;
1818 }
1819 if (read_only)
281b5995 1820 goto done;
617ba13b 1821 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1822 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1823 "running e2fsck is recommended");
617ba13b 1824 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1825 ext4_msg(sb, KERN_WARNING,
1826 "warning: mounting fs with errors, "
1827 "running e2fsck is recommended");
ed3ce80a 1828 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1829 le16_to_cpu(es->s_mnt_count) >=
1830 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1831 ext4_msg(sb, KERN_WARNING,
1832 "warning: maximal mount count reached, "
1833 "running e2fsck is recommended");
ac27a0ec
DK		 1834 else if (le32_to_cpu(es->s_checkinterval) &&
1835 (le32_to_cpu(es->s_lastcheck) +
1836 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1837 ext4_msg(sb, KERN_WARNING,
1838 "warning: checktime reached, "
1839 "running e2fsck is recommended");
0b8e58a1 1840 if (!sbi->s_journal)
0390131b 1841 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1842 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1843 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1844 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1845 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1846 ext4_update_dynamic_rev(sb);
0390131b
FM		 1847 if (sbi->s_journal)
1848 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1849
e2d67052 1850 ext4_commit_super(sb, 1);
281b5995 1851done:
ac27a0ec 1852 if (test_opt(sb, DEBUG))
a9df9a49 1853 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1854 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1855 sb->s_blocksize,
1856 sbi->s_groups_count,
617ba13b
MC		 1857 EXT4_BLOCKS_PER_GROUP(sb),
1858 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1859 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1860
7abc52c2 1861 cleancache_init_fs(sb);
ac27a0ec
DK		 1862 return res;
1863}
1864
772cb7c8
JS		 1865static int ext4_fill_flex_info(struct super_block *sb)
1866{
1867 struct ext4_sb_info *sbi = EXT4_SB(sb);
1868 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1869 ext4_group_t flex_group_count;
1870 ext4_group_t flex_group;
d50f2ab6 1871 unsigned int groups_per_flex = 0;
c5ca7c76 1872 size_t size;
772cb7c8
JS		 1873 int i;
1874
503358ae 1875 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1876 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1877 sbi->s_log_groups_per_flex = 0;
1878 return 1;
1879 }
d50f2ab6 1880 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1881
c62a11fd
FB		 1882 /* We allocate both existing and potentially added groups */
1883 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1884 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1885 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1886 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1887 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1888 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1889 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1890 flex_group_count);
1891 goto failed;
772cb7c8 1892 }
772cb7c8 1893
772cb7c8 1894 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1895 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1896
1897 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1898 atomic_add(ext4_free_inodes_count(sb, gdp),
1899 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1900 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1901 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1902 atomic_add(ext4_used_dirs_count(sb, gdp),
1903 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1904 }
1905
1906 return 1;
1907failed:
1908 return 0;
1909}
1910
717d50e4
AD		 1911__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1912 struct ext4_group_desc *gdp)
1913{
1914 __u16 crc = 0;
1915
1916 if (sbi->s_es->s_feature_ro_compat &
1917 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1918 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1919 __le32 le_group = cpu_to_le32(block_group);
1920
1921 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1922 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1923 crc = crc16(crc, (__u8 *)gdp, offset);
1924 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1925 /* for checksum of struct ext4_group_desc do the rest...*/
1926 if ((sbi->s_es->s_feature_incompat &
1927 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1928 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1929 crc = crc16(crc, (__u8 *)gdp + offset,
1930 le16_to_cpu(sbi->s_es->s_desc_size) -
1931 offset);
1932 }
1933
1934 return cpu_to_le16(crc);
1935}
1936
1937int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1938 struct ext4_group_desc *gdp)
1939{
1940 if ((sbi->s_es->s_feature_ro_compat &
1941 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1942 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1943 return 0;
1944
1945 return 1;
1946}
1947
ac27a0ec 1948/* Called at mount-time, super-block is locked */
bfff6873
LC		 1949static int ext4_check_descriptors(struct super_block *sb,
1950 ext4_group_t *first_not_zeroed)
ac27a0ec 1951{
617ba13b
MC		 1952 struct ext4_sb_info *sbi = EXT4_SB(sb);
1953 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1954 ext4_fsblk_t last_block;
bd81d8ee
LV		 1955 ext4_fsblk_t block_bitmap;
1956 ext4_fsblk_t inode_bitmap;
1957 ext4_fsblk_t inode_table;
ce421581 1958 int flexbg_flag = 0;
bfff6873 1959 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 1960
ce421581
JS		 1961 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1962 flexbg_flag = 1;
1963
af5bc92d 1964 ext4_debug("Checking group descriptors");
ac27a0ec 1965
197cd65a
AM		 1966 for (i = 0; i < sbi->s_groups_count; i++) {
1967 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1968
ce421581 1969 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1970 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1971 else
1972 last_block = first_block +
617ba13b 1973 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1974
bfff6873
LC		 1975 if ((grp == sbi->s_groups_count) &&
1976 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
1977 grp = i;
1978
8fadc143 1979 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1980 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1981 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1982 "Block bitmap for group %u not in group "
b31e1552 1983 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1984 return 0;
1985 }
8fadc143 1986 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1987 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1988 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1989 "Inode bitmap for group %u not in group "
b31e1552 1990 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1991 return 0;
1992 }
8fadc143 1993 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1994 if (inode_table < first_block ||
2b2d6d01 1995 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1996 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1997 "Inode table for group %u not in group "
b31e1552 1998 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1999 return 0;
2000 }
955ce5f5 2001 ext4_lock_group(sb, i);
717d50e4 2002 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2003 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2004 "Checksum for group %u failed (%u!=%u)",
2005 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2006 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2007 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2008 ext4_unlock_group(sb, i);
8a266467 2009 return 0;
7ee1ec4c 2010 }
717d50e4 2011 }
955ce5f5 2012 ext4_unlock_group(sb, i);
ce421581
JS		 2013 if (!flexbg_flag)
2014 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2015 }
bfff6873
LC		 2016 if (NULL != first_not_zeroed)
2017 *first_not_zeroed = grp;
ac27a0ec 2018
5dee5437
TT		 2019 ext4_free_blocks_count_set(sbi->s_es,
2020 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2021 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2022 return 1;
2023}
2024
617ba13b 2025/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2026 * the superblock) which were deleted from all directories, but held open by
2027 * a process at the time of a crash. We walk the list and try to delete these
2028 * inodes at recovery time (only with a read-write filesystem).
2029 *
2030 * In order to keep the orphan inode chain consistent during traversal (in
2031 * case of crash during recovery), we link each inode into the superblock
2032 * orphan list_head and handle it the same way as an inode deletion during
2033 * normal operation (which journals the operations for us).
2034 *
2035 * We only do an iget() and an iput() on each inode, which is very safe if we
2036 * accidentally point at an in-use or already deleted inode. The worst that
2037 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2038 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2039 * e2fsck was run on this filesystem, and it must have already done the orphan
2040 * inode cleanup for us, so we can safely abort without any further action.
2041 */
2b2d6d01
TT		 2042static void ext4_orphan_cleanup(struct super_block *sb,
2043 struct ext4_super_block *es)
ac27a0ec
DK		 2044{
2045 unsigned int s_flags = sb->s_flags;
2046 int nr_orphans = 0, nr_truncates = 0;
2047#ifdef CONFIG_QUOTA
2048 int i;
2049#endif
2050 if (!es->s_last_orphan) {
2051 jbd_debug(4, "no orphan inodes to clean up\n");
2052 return;
2053 }
2054
a8f48a95 2055 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2056 ext4_msg(sb, KERN_ERR, "write access "
2057 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2058 return;
2059 }
2060
d39195c3
AG		 2061 /* Check if feature set would not allow a r/w mount */
2062 if (!ext4_feature_set_ok(sb, 0)) {
2063 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2064 "unknown ROCOMPAT features");
2065 return;
2066 }
2067
617ba13b 2068 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2069 if (es->s_last_orphan)
2070 jbd_debug(1, "Errors on filesystem, "
2071 "clearing orphan list.\n");
2072 es->s_last_orphan = 0;
2073 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2074 return;
2075 }
2076
2077 if (s_flags & MS_RDONLY) {
b31e1552 2078 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2079 sb->s_flags &= ~MS_RDONLY;
2080 }
2081#ifdef CONFIG_QUOTA
2082 /* Needed for iput() to work correctly and not trash data */
2083 sb->s_flags |= MS_ACTIVE;
2084 /* Turn on quotas so that they are updated correctly */
2085 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2086 if (EXT4_SB(sb)->s_qf_names[i]) {
2087 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2088 if (ret < 0)
b31e1552
ES		 2089 ext4_msg(sb, KERN_ERR,
2090 "Cannot turn on journaled "
2091 "quota: error %d", ret);
ac27a0ec
DK		 2092 }
2093 }
2094#endif
2095
2096 while (es->s_last_orphan) {
2097 struct inode *inode;
2098
97bd42b9
JB		 2099 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2100 if (IS_ERR(inode)) {
ac27a0ec
DK		 2101 es->s_last_orphan = 0;
2102 break;
2103 }
2104
617ba13b 2105 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2106 dquot_initialize(inode);
ac27a0ec 2107 if (inode->i_nlink) {
b31e1552
ES		 2108 ext4_msg(sb, KERN_DEBUG,
2109 "%s: truncating inode %lu to %lld bytes",
46e665e9 2110 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2111 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2112 inode->i_ino, inode->i_size);
617ba13b 2113 ext4_truncate(inode);
ac27a0ec
DK		 2114 nr_truncates++;
2115 } else {
b31e1552
ES		 2116 ext4_msg(sb, KERN_DEBUG,
2117 "%s: deleting unreferenced inode %lu",
46e665e9 2118 __func__, inode->i_ino);
ac27a0ec
DK		 2119 jbd_debug(2, "deleting unreferenced inode %lu\n",
2120 inode->i_ino);
2121 nr_orphans++;
2122 }
2123 iput(inode); /* The delete magic happens here! */
2124 }
2125
2b2d6d01 2126#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2127
2128 if (nr_orphans)
b31e1552
ES		 2129 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2130 PLURAL(nr_orphans));
ac27a0ec 2131 if (nr_truncates)
b31e1552
ES		 2132 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2133 PLURAL(nr_truncates));
ac27a0ec
DK		 2134#ifdef CONFIG_QUOTA
2135 /* Turn quotas off */
2136 for (i = 0; i < MAXQUOTAS; i++) {
2137 if (sb_dqopt(sb)->files[i])
287a8095 2138 dquot_quota_off(sb, i);
ac27a0ec
DK		 2139 }
2140#endif
2141 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2142}
0b8e58a1 2143
cd2291a4
ES		 2144/*
2145 * Maximal extent format file size.
2146 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2147 * extent format containers, within a sector_t, and within i_blocks
2148 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2149 * so that won't be a limiting factor.
2150 *
f17722f9
LC		 2151 * However there is other limiting factor. We do store extents in the form
2152 * of starting block and length, hence the resulting length of the extent
2153 * covering maximum file size must fit into on-disk format containers as
2154 * well. Given that length is always by 1 unit bigger than max unit (because
2155 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2156 *
cd2291a4
ES		 2157 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2158 */
f287a1a5 2159static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2160{
2161 loff_t res;
2162 loff_t upper_limit = MAX_LFS_FILESIZE;
2163
2164 /* small i_blocks in vfs inode? */
f287a1a5 2165 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2166 /*
90c699a9 2167 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2168 * i_block represent total blocks in 512 bytes
2169 * 32 == size of vfs inode i_blocks * 8
2170 */
2171 upper_limit = (1LL << 32) - 1;
2172
2173 /* total blocks in file system block size */
2174 upper_limit >>= (blkbits - 9);
2175 upper_limit <<= blkbits;
2176 }
2177
f17722f9
LC		 2178 /*
2179 * 32-bit extent-start container, ee_block. We lower the maxbytes
2180 * by one fs block, so ee_len can cover the extent of maximum file
2181 * size
2182 */
2183 res = (1LL << 32) - 1;
cd2291a4 2184 res <<= blkbits;
cd2291a4
ES		 2185
2186 /* Sanity check against vm- & vfs- imposed limits */
2187 if (res > upper_limit)
2188 res = upper_limit;
2189
2190 return res;
2191}
ac27a0ec 2192
ac27a0ec 2193/*
cd2291a4 2194 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2195 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2196 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2197 */
f287a1a5 2198static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2199{
617ba13b 2200 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2201 int meta_blocks;
2202 loff_t upper_limit;
0b8e58a1
AD		 2203 /* This is calculated to be the largest file size for a dense, block
2204 * mapped file such that the file's total number of 512-byte sectors,
2205 * including data and all indirect blocks, does not exceed (2^48 - 1).
2206 *
2207 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2208 * number of 512-byte sectors of the file.
0fc1b451
AK		 2209 */
2210
f287a1a5 2211 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2212 /*
90c699a9 2213 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2214 * the inode i_block field represents total file blocks in
2215 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2216 */
2217 upper_limit = (1LL << 32) - 1;
2218
2219 /* total blocks in file system block size */
2220 upper_limit >>= (bits - 9);
2221
2222 } else {
8180a562
AK		 2223 /*
2224 * We use 48 bit ext4_inode i_blocks
2225 * With EXT4_HUGE_FILE_FL set the i_blocks
2226 * represent total number of blocks in
2227 * file system block size
2228 */
0fc1b451
AK		 2229 upper_limit = (1LL << 48) - 1;
2230
0fc1b451
AK		 2231 }
2232
2233 /* indirect blocks */
2234 meta_blocks = 1;
2235 /* double indirect blocks */
2236 meta_blocks += 1 + (1LL << (bits-2));
2237 /* tripple indirect blocks */
2238 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2239
2240 upper_limit -= meta_blocks;
2241 upper_limit <<= bits;
ac27a0ec
DK		 2242
2243 res += 1LL << (bits-2);
2244 res += 1LL << (2*(bits-2));
2245 res += 1LL << (3*(bits-2));
2246 res <<= bits;
2247 if (res > upper_limit)
2248 res = upper_limit;
0fc1b451
AK		 2249
2250 if (res > MAX_LFS_FILESIZE)
2251 res = MAX_LFS_FILESIZE;
2252
ac27a0ec
DK		 2253 return res;
2254}
2255
617ba13b 2256static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2257 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2258{
617ba13b 2259 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2260 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2261 int has_super = 0;
2262
2263 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2264
617ba13b 2265 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2266 nr < first_meta_bg)
70bbb3e0 2267 return logical_sb_block + nr + 1;
ac27a0ec 2268 bg = sbi->s_desc_per_block * nr;
617ba13b 2269 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2270 has_super = 1;
0b8e58a1 2271
617ba13b 2272 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2273}
2274
c9de560d
AT		 2275/**
2276 * ext4_get_stripe_size: Get the stripe size.
2277 * @sbi: In memory super block info
2278 *
2279 * If we have specified it via mount option, then
2280 * use the mount option value. If the value specified at mount time is
2281 * greater than the blocks per group use the super block value.
2282 * If the super block value is greater than blocks per group return 0.
2283 * Allocator needs it be less than blocks per group.
2284 *
2285 */
2286static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2287{
2288 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2289 unsigned long stripe_width =
2290 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2291 int ret;
c9de560d
AT		 2292
2293 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2294 ret = sbi->s_stripe;
2295 else if (stripe_width <= sbi->s_blocks_per_group)
2296 ret = stripe_width;
2297 else if (stride <= sbi->s_blocks_per_group)
2298 ret = stride;
2299 else
2300 ret = 0;
c9de560d 2301
3eb08658
DE		 2302 /*
2303 * If the stripe width is 1, this makes no sense and
2304 * we set it to 0 to turn off stripe handling code.
2305 */
2306 if (ret <= 1)
2307 ret = 0;
c9de560d 2308
3eb08658 2309 return ret;
c9de560d 2310}
ac27a0ec 2311
3197ebdb
TT		 2312/* sysfs supprt */
2313
2314struct ext4_attr {
2315 struct attribute attr;
2316 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2317 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2318 const char *, size_t);
2319 int offset;
2320};
2321
2322static int parse_strtoul(const char *buf,
2323 unsigned long max, unsigned long *value)
2324{
2325 char *endp;
2326
e7d2860b
AGR		 2327 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2328 endp = skip_spaces(endp);
3197ebdb
TT		 2329 if (*endp || *value > max)
2330 return -EINVAL;
2331
2332 return 0;
2333}
2334
2335static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2336 struct ext4_sb_info *sbi,
2337 char *buf)
2338{
2339 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2340 (s64) EXT4_C2B(sbi,
2341 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2342}
2343
2344static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2345 struct ext4_sb_info *sbi, char *buf)
2346{
2347 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2348
f613dfcb
TT		 2349 if (!sb->s_bdev->bd_part)
2350 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2351 return snprintf(buf, PAGE_SIZE, "%lu\n",
2352 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2353 sbi->s_sectors_written_start) >> 1);
2354}
2355
2356static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2357 struct ext4_sb_info *sbi, char *buf)
2358{
2359 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2360
f613dfcb
TT		 2361 if (!sb->s_bdev->bd_part)
2362 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2363 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2364 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2365 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2366 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2367}
2368
2369static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2370 struct ext4_sb_info *sbi,
2371 const char *buf, size_t count)
2372{
2373 unsigned long t;
2374
2375 if (parse_strtoul(buf, 0x40000000, &t))
2376 return -EINVAL;
2377
5dbd571d 2378 if (t && !is_power_of_2(t))
3197ebdb
TT		 2379 return -EINVAL;
2380
2381 sbi->s_inode_readahead_blks = t;
2382 return count;
2383}
2384
2385static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2386 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2387{
2388 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2389
2390 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2391}
2392
2393static ssize_t sbi_ui_store(struct ext4_attr *a,
2394 struct ext4_sb_info *sbi,
2395 const char *buf, size_t count)
2396{
2397 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2398 unsigned long t;
2399
2400 if (parse_strtoul(buf, 0xffffffff, &t))
2401 return -EINVAL;
2402 *ui = t;
2403 return count;
2404}
2405
2406#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2407static struct ext4_attr ext4_attr_##_name = { \
2408 .attr = {.name = __stringify(_name), .mode = _mode }, \
2409 .show = _show, \
2410 .store = _store, \
2411 .offset = offsetof(struct ext4_sb_info, _elname), \
2412}
2413#define EXT4_ATTR(name, mode, show, store) \
2414static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2415
857ac889 2416#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2417#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2418#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2419#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2420 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2421#define ATTR_LIST(name) &ext4_attr_##name.attr
2422
2423EXT4_RO_ATTR(delayed_allocation_blocks);
2424EXT4_RO_ATTR(session_write_kbytes);
2425EXT4_RO_ATTR(lifetime_write_kbytes);
2426EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2427 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2428EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2429EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2430EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2431EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2432EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2433EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2434EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2435EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2436
2437static struct attribute *ext4_attrs[] = {
2438 ATTR_LIST(delayed_allocation_blocks),
2439 ATTR_LIST(session_write_kbytes),
2440 ATTR_LIST(lifetime_write_kbytes),
2441 ATTR_LIST(inode_readahead_blks),
11013911 2442 ATTR_LIST(inode_goal),
3197ebdb
TT		 2443 ATTR_LIST(mb_stats),
2444 ATTR_LIST(mb_max_to_scan),
2445 ATTR_LIST(mb_min_to_scan),
2446 ATTR_LIST(mb_order2_req),
2447 ATTR_LIST(mb_stream_req),
2448 ATTR_LIST(mb_group_prealloc),
55138e0b 2449 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2450 NULL,
2451};
2452
857ac889
LC		 2453/* Features this copy of ext4 supports */
2454EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2455EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2456
2457static struct attribute *ext4_feat_attrs[] = {
2458 ATTR_LIST(lazy_itable_init),
27ee40df 2459 ATTR_LIST(batched_discard),
857ac889
LC		 2460 NULL,
2461};
2462
3197ebdb
TT		 2463static ssize_t ext4_attr_show(struct kobject *kobj,
2464 struct attribute *attr, char *buf)
2465{
2466 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2467 s_kobj);
2468 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2469
2470 return a->show ? a->show(a, sbi, buf) : 0;
2471}
2472
2473static ssize_t ext4_attr_store(struct kobject *kobj,
2474 struct attribute *attr,
2475 const char *buf, size_t len)
2476{
2477 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2478 s_kobj);
2479 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2480
2481 return a->store ? a->store(a, sbi, buf, len) : 0;
2482}
2483
2484static void ext4_sb_release(struct kobject *kobj)
2485{
2486 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2487 s_kobj);
2488 complete(&sbi->s_kobj_unregister);
2489}
2490
52cf25d0 2491static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2492 .show = ext4_attr_show,
2493 .store = ext4_attr_store,
2494};
2495
2496static struct kobj_type ext4_ktype = {
2497 .default_attrs = ext4_attrs,
2498 .sysfs_ops = &ext4_attr_ops,
2499 .release = ext4_sb_release,
2500};
2501
857ac889
LC		 2502static void ext4_feat_release(struct kobject *kobj)
2503{
2504 complete(&ext4_feat->f_kobj_unregister);
2505}
2506
2507static struct kobj_type ext4_feat_ktype = {
2508 .default_attrs = ext4_feat_attrs,
2509 .sysfs_ops = &ext4_attr_ops,
2510 .release = ext4_feat_release,
2511};
2512
a13fb1a4
ES		 2513/*
2514 * Check whether this filesystem can be mounted based on
2515 * the features present and the RDONLY/RDWR mount requested.
2516 * Returns 1 if this filesystem can be mounted as requested,
2517 * 0 if it cannot be.
2518 */
2519static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2520{
2521 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2522 ext4_msg(sb, KERN_ERR,
2523 "Couldn't mount because of "
2524 "unsupported optional features (%x)",
2525 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2526 ~EXT4_FEATURE_INCOMPAT_SUPP));
2527 return 0;
2528 }
2529
2530 if (readonly)
2531 return 1;
2532
2533 /* Check that feature set is OK for a read-write mount */
2534 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2535 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2536 "unsupported optional features (%x)",
2537 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2538 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2539 return 0;
2540 }
2541 /*
2542 * Large file size enabled file system can only be mounted
2543 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2544 */
2545 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2546 if (sizeof(blkcnt_t) < sizeof(u64)) {
2547 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2548 "cannot be mounted RDWR without "
2549 "CONFIG_LBDAF");
2550 return 0;
2551 }
2552 }
bab08ab9
TT		 2553 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2554 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2555 ext4_msg(sb, KERN_ERR,
2556 "Can't support bigalloc feature without "
2557 "extents feature\n");
2558 return 0;
2559 }
a13fb1a4
ES		 2560 return 1;
2561}
2562
66e61a9e
TT		 2563/*
2564 * This function is called once a day if we have errors logged
2565 * on the file system
2566 */
2567static void print_daily_error_info(unsigned long arg)
2568{
2569 struct super_block *sb = (struct super_block *) arg;
2570 struct ext4_sb_info *sbi;
2571 struct ext4_super_block *es;
2572
2573 sbi = EXT4_SB(sb);
2574 es = sbi->s_es;
2575
2576 if (es->s_error_count)
2577 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2578 le32_to_cpu(es->s_error_count));
2579 if (es->s_first_error_time) {
2580 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2581 sb->s_id, le32_to_cpu(es->s_first_error_time),
2582 (int) sizeof(es->s_first_error_func),
2583 es->s_first_error_func,
2584 le32_to_cpu(es->s_first_error_line));
2585 if (es->s_first_error_ino)
2586 printk(": inode %u",
2587 le32_to_cpu(es->s_first_error_ino));
2588 if (es->s_first_error_block)
2589 printk(": block %llu", (unsigned long long)
2590 le64_to_cpu(es->s_first_error_block));
2591 printk("\n");
2592 }
2593 if (es->s_last_error_time) {
2594 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2595 sb->s_id, le32_to_cpu(es->s_last_error_time),
2596 (int) sizeof(es->s_last_error_func),
2597 es->s_last_error_func,
2598 le32_to_cpu(es->s_last_error_line));
2599 if (es->s_last_error_ino)
2600 printk(": inode %u",
2601 le32_to_cpu(es->s_last_error_ino));
2602 if (es->s_last_error_block)
2603 printk(": block %llu", (unsigned long long)
2604 le64_to_cpu(es->s_last_error_block));
2605 printk("\n");
2606 }
2607 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2608}
2609
bfff6873
LC		 2610/* Find next suitable group and run ext4_init_inode_table */
2611static int ext4_run_li_request(struct ext4_li_request *elr)
2612{
2613 struct ext4_group_desc *gdp = NULL;
2614 ext4_group_t group, ngroups;
2615 struct super_block *sb;
2616 unsigned long timeout = 0;
2617 int ret = 0;
2618
2619 sb = elr->lr_super;
2620 ngroups = EXT4_SB(sb)->s_groups_count;
2621
2622 for (group = elr->lr_next_group; group < ngroups; group++) {
2623 gdp = ext4_get_group_desc(sb, group, NULL);
2624 if (!gdp) {
2625 ret = 1;
2626 break;
2627 }
2628
2629 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2630 break;
2631 }
2632
2633 if (group == ngroups)
2634 ret = 1;
2635
2636 if (!ret) {
2637 timeout = jiffies;
2638 ret = ext4_init_inode_table(sb, group,
2639 elr->lr_timeout ? 0 : 1);
2640 if (elr->lr_timeout == 0) {
51ce6511
LC		 2641 timeout = (jiffies - timeout) *
2642 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2643 elr->lr_timeout = timeout;
2644 }
2645 elr->lr_next_sched = jiffies + elr->lr_timeout;
2646 elr->lr_next_group = group + 1;
2647 }
2648
2649 return ret;
2650}
2651
2652/*
2653 * Remove lr_request from the list_request and free the
4ed5c033 2654 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2655 */
2656static void ext4_remove_li_request(struct ext4_li_request *elr)
2657{
2658 struct ext4_sb_info *sbi;
2659
2660 if (!elr)
2661 return;
2662
2663 sbi = elr->lr_sbi;
2664
2665 list_del(&elr->lr_request);
2666 sbi->s_li_request = NULL;
2667 kfree(elr);
2668}
2669
2670static void ext4_unregister_li_request(struct super_block *sb)
2671{
1bb933fb
LC		 2672 mutex_lock(&ext4_li_mtx);
2673 if (!ext4_li_info) {
2674 mutex_unlock(&ext4_li_mtx);
bfff6873 2675 return;
1bb933fb 2676 }
bfff6873
LC		 2677
2678 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2679 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2680 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2681 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2682}
2683
8f1f7453
ES		 2684static struct task_struct *ext4_lazyinit_task;
2685
bfff6873
LC		 2686/*
2687 * This is the function where ext4lazyinit thread lives. It walks
2688 * through the request list searching for next scheduled filesystem.
2689 * When such a fs is found, run the lazy initialization request
2690 * (ext4_rn_li_request) and keep track of the time spend in this
2691 * function. Based on that time we compute next schedule time of
2692 * the request. When walking through the list is complete, compute
2693 * next waking time and put itself into sleep.
2694 */
2695static int ext4_lazyinit_thread(void *arg)
2696{
2697 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2698 struct list_head *pos, *n;
2699 struct ext4_li_request *elr;
4ed5c033 2700 unsigned long next_wakeup, cur;
bfff6873
LC		 2701
2702 BUG_ON(NULL == eli);
2703
bfff6873
LC		 2704cont_thread:
2705 while (true) {
2706 next_wakeup = MAX_JIFFY_OFFSET;
2707
2708 mutex_lock(&eli->li_list_mtx);
2709 if (list_empty(&eli->li_request_list)) {
2710 mutex_unlock(&eli->li_list_mtx);
2711 goto exit_thread;
2712 }
2713
2714 list_for_each_safe(pos, n, &eli->li_request_list) {
2715 elr = list_entry(pos, struct ext4_li_request,
2716 lr_request);
2717
b2c78cd0
TT		 2718 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2719 if (ext4_run_li_request(elr) != 0) {
2720 /* error, remove the lazy_init job */
2721 ext4_remove_li_request(elr);
2722 continue;
2723 }
bfff6873
LC		 2724 }
2725
2726 if (time_before(elr->lr_next_sched, next_wakeup))
2727 next_wakeup = elr->lr_next_sched;
2728 }
2729 mutex_unlock(&eli->li_list_mtx);
2730
a0acae0e 2731 try_to_freeze();
bfff6873 2732
4ed5c033
LC		 2733 cur = jiffies;
2734 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2735 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2736 cond_resched();
2737 continue;
2738 }
2739
4ed5c033
LC		 2740 schedule_timeout_interruptible(next_wakeup - cur);
2741
8f1f7453
ES		 2742 if (kthread_should_stop()) {
2743 ext4_clear_request_list();
2744 goto exit_thread;
2745 }
bfff6873
LC		 2746 }
2747
2748exit_thread:
2749 /*
2750 * It looks like the request list is empty, but we need
2751 * to check it under the li_list_mtx lock, to prevent any
2752 * additions into it, and of course we should lock ext4_li_mtx
2753 * to atomically free the list and ext4_li_info, because at
2754 * this point another ext4 filesystem could be registering
2755 * new one.
2756 */
2757 mutex_lock(&ext4_li_mtx);
2758 mutex_lock(&eli->li_list_mtx);
2759 if (!list_empty(&eli->li_request_list)) {
2760 mutex_unlock(&eli->li_list_mtx);
2761 mutex_unlock(&ext4_li_mtx);
2762 goto cont_thread;
2763 }
2764 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2765 kfree(ext4_li_info);
2766 ext4_li_info = NULL;
2767 mutex_unlock(&ext4_li_mtx);
2768
2769 return 0;
2770}
2771
2772static void ext4_clear_request_list(void)
2773{
2774 struct list_head *pos, *n;
2775 struct ext4_li_request *elr;
2776
2777 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2778 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2779 elr = list_entry(pos, struct ext4_li_request,
2780 lr_request);
2781 ext4_remove_li_request(elr);
2782 }
2783 mutex_unlock(&ext4_li_info->li_list_mtx);
2784}
2785
2786static int ext4_run_lazyinit_thread(void)
2787{
8f1f7453
ES		 2788 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2789 ext4_li_info, "ext4lazyinit");
2790 if (IS_ERR(ext4_lazyinit_task)) {
2791 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2792 ext4_clear_request_list();
bfff6873
LC		 2793 kfree(ext4_li_info);
2794 ext4_li_info = NULL;
92b97816 2795 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2796 "initialization thread\n",
2797 err);
2798 return err;
2799 }
2800 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2801 return 0;
2802}
2803
2804/*
2805 * Check whether it make sense to run itable init. thread or not.
2806 * If there is at least one uninitialized inode table, return
2807 * corresponding group number, else the loop goes through all
2808 * groups and return total number of groups.
2809 */
2810static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2811{
2812 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2813 struct ext4_group_desc *gdp = NULL;
2814
2815 for (group = 0; group < ngroups; group++) {
2816 gdp = ext4_get_group_desc(sb, group, NULL);
2817 if (!gdp)
2818 continue;
2819
2820 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2821 break;
2822 }
2823
2824 return group;
2825}
2826
2827static int ext4_li_info_new(void)
2828{
2829 struct ext4_lazy_init *eli = NULL;
2830
2831 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2832 if (!eli)
2833 return -ENOMEM;
2834
bfff6873
LC		 2835 INIT_LIST_HEAD(&eli->li_request_list);
2836 mutex_init(&eli->li_list_mtx);
2837
bfff6873
LC		 2838 eli->li_state |= EXT4_LAZYINIT_QUIT;
2839
2840 ext4_li_info = eli;
2841
2842 return 0;
2843}
2844
2845static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2846 ext4_group_t start)
2847{
2848 struct ext4_sb_info *sbi = EXT4_SB(sb);
2849 struct ext4_li_request *elr;
2850 unsigned long rnd;
2851
2852 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2853 if (!elr)
2854 return NULL;
2855
2856 elr->lr_super = sb;
2857 elr->lr_sbi = sbi;
2858 elr->lr_next_group = start;
2859
2860 /*
2861 * Randomize first schedule time of the request to
2862 * spread the inode table initialization requests
2863 * better.
2864 */
2865 get_random_bytes(&rnd, sizeof(rnd));
2866 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2867 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2868
2869 return elr;
2870}
2871
2872static int ext4_register_li_request(struct super_block *sb,
2873 ext4_group_t first_not_zeroed)
2874{
2875 struct ext4_sb_info *sbi = EXT4_SB(sb);
2876 struct ext4_li_request *elr;
2877 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2878 int ret = 0;
bfff6873 2879
51ce6511
LC		 2880 if (sbi->s_li_request != NULL) {
2881 /*
2882 * Reset timeout so it can be computed again, because
2883 * s_li_wait_mult might have changed.
2884 */
2885 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2886 return 0;
51ce6511 2887 }
bfff6873
LC		 2888
2889 if (first_not_zeroed == ngroups ||
2890 (sb->s_flags & MS_RDONLY) ||
55ff3840 2891 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 2892 return 0;
bfff6873
LC		 2893
2894 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 2895 if (!elr)
2896 return -ENOMEM;
bfff6873
LC		 2897
2898 mutex_lock(&ext4_li_mtx);
2899
2900 if (NULL == ext4_li_info) {
2901 ret = ext4_li_info_new();
2902 if (ret)
2903 goto out;
2904 }
2905
2906 mutex_lock(&ext4_li_info->li_list_mtx);
2907 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2908 mutex_unlock(&ext4_li_info->li_list_mtx);
2909
2910 sbi->s_li_request = elr;
46e4690b
TM		 2911 /*
2912 * set elr to NULL here since it has been inserted to
2913 * the request_list and the removal and free of it is
2914 * handled by ext4_clear_request_list from now on.
2915 */
2916 elr = NULL;
bfff6873
LC		 2917
2918 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2919 ret = ext4_run_lazyinit_thread();
2920 if (ret)
2921 goto out;
2922 }
bfff6873 2923out:
beed5ecb
NK		 2924 mutex_unlock(&ext4_li_mtx);
2925 if (ret)
bfff6873 2926 kfree(elr);
bfff6873
LC		 2927 return ret;
2928}
2929
2930/*
2931 * We do not need to lock anything since this is called on
2932 * module unload.
2933 */
2934static void ext4_destroy_lazyinit_thread(void)
2935{
2936 /*
2937 * If thread exited earlier
2938 * there's nothing to be done.
2939 */
8f1f7453 2940 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2941 return;
2942
8f1f7453 2943 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2944}
2945
2b2d6d01 2946static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 2947{
d4c402d9 2948 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 2949 struct buffer_head *bh;
617ba13b
MC		 2950 struct ext4_super_block *es = NULL;
2951 struct ext4_sb_info *sbi;
2952 ext4_fsblk_t block;
2953 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2954 ext4_fsblk_t logical_sb_block;
ac27a0ec 2955 unsigned long offset = 0;
ac27a0ec
DK		 2956 unsigned long journal_devnum = 0;
2957 unsigned long def_mount_opts;
2958 struct inode *root;
9f6200bb 2959 char *cp;
0390131b 2960 const char *descr;
dcc7dae3 2961 int ret = -ENOMEM;
281b5995 2962 int blocksize, clustersize;
4ec11028
TT		 2963 unsigned int db_count;
2964 unsigned int i;
281b5995 2965 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 2966 __u64 blocks_count;
833f4077 2967 int err;
b3881f74 2968 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 2969 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 2970
2971 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2972 if (!sbi)
dcc7dae3 2973 goto out_free_orig;
705895b6
PE		 2974
2975 sbi->s_blockgroup_lock =
2976 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2977 if (!sbi->s_blockgroup_lock) {
2978 kfree(sbi);
dcc7dae3 2979 goto out_free_orig;
705895b6 2980 }
ac27a0ec
DK		 2981 sb->s_fs_info = sbi;
2982 sbi->s_mount_opt = 0;
617ba13b
MC		 2983 sbi->s_resuid = EXT4_DEF_RESUID;
2984 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2985 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2986 sbi->s_sb_block = sb_block;
f613dfcb
TT		 2987 if (sb->s_bdev->bd_part)
2988 sbi->s_sectors_written_start =
2989 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 2990
9f6200bb
TT		 2991 /* Cleanup superblock name */
2992 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2993 *cp = '!';
2994
dcc7dae3 2995 ret = -EINVAL;
617ba13b 2996 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2997 if (!blocksize) {
b31e1552 2998 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2999 goto out_fail;
3000 }
3001
3002 /*
617ba13b 3003 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3004 * block sizes. We need to calculate the offset from buffer start.
3005 */
617ba13b 3006 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3007 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3008 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3009 } else {
70bbb3e0 3010 logical_sb_block = sb_block;
ac27a0ec
DK		 3011 }
3012
70bbb3e0 3013 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3014 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3015 goto out_fail;
3016 }
3017 /*
3018 * Note: s_es must be initialized as soon as possible because
617ba13b 3019 * some ext4 macro-instructions depend on its value
ac27a0ec 3020 */
617ba13b 3021 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3022 sbi->s_es = es;
3023 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3024 if (sb->s_magic != EXT4_SUPER_MAGIC)
3025 goto cantfind_ext4;
afc32f7e 3026 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3027
3028 /* Set defaults before we parse the mount options */
3029 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3030 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3031 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3032 set_opt(sb, DEBUG);
87f26807 3033 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3034 set_opt(sb, GRPID);
617ba13b 3035 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3036 set_opt(sb, NO_UID32);
ea663336 3037 /* xattr user namespace & acls are now defaulted on */
03010a33 3038#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3039 set_opt(sb, XATTR_USER);
2e7842b8 3040#endif
03010a33 3041#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3042 set_opt(sb, POSIX_ACL);
2e7842b8 3043#endif
6fd7a467 3044 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3045 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3046 set_opt(sb, JOURNAL_DATA);
617ba13b 3047 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3048 set_opt(sb, ORDERED_DATA);
617ba13b 3049 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3050 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3051
3052 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3053 set_opt(sb, ERRORS_PANIC);
bb4f397a 3054 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3055 set_opt(sb, ERRORS_CONT);
bb4f397a 3056 else
fd8c37ec 3057 set_opt(sb, ERRORS_RO);
8b67f04a 3058 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3059 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3060 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3061 set_opt(sb, DISCARD);
ac27a0ec
DK		 3062
3063 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3064 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3065 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3066 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3067 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3068
8b67f04a 3069 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3070 set_opt(sb, BARRIER);
ac27a0ec 3071
dd919b98
AK		 3072 /*
3073 * enable delayed allocation by default
3074 * Use -o nodelalloc to turn it off
3075 */
8b67f04a
TT		 3076 if (!IS_EXT3_SB(sb) &&
3077 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3078 set_opt(sb, DELALLOC);
dd919b98 3079
51ce6511
LC		 3080 /*
3081 * set default s_li_wait_mult for lazyinit, for the case there is
3082 * no mount option specified.
3083 */
3084 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3085
8b67f04a 3086 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3087 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3088 ext4_msg(sb, KERN_WARNING,
3089 "failed to parse options in superblock: %s",
3090 sbi->s_es->s_mount_opts);
3091 }
5a916be1 3092 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3093 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3094 &journal_ioprio, 0))
ac27a0ec
DK		 3095 goto failed_mount;
3096
56889787
TT		 3097 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3098 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3099 "with data=journal disables delayed "
3100 "allocation and O_DIRECT support!\n");
3101 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3102 ext4_msg(sb, KERN_ERR, "can't mount with "
3103 "both data=journal and delalloc");
3104 goto failed_mount;
3105 }
3106 if (test_opt(sb, DIOREAD_NOLOCK)) {
3107 ext4_msg(sb, KERN_ERR, "can't mount with "
3108 "both data=journal and delalloc");
3109 goto failed_mount;
3110 }
3111 if (test_opt(sb, DELALLOC))
3112 clear_opt(sb, DELALLOC);
3113 }
3114
3115 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3116 if (test_opt(sb, DIOREAD_NOLOCK)) {
3117 if (blocksize < PAGE_SIZE) {
3118 ext4_msg(sb, KERN_ERR, "can't mount with "
3119 "dioread_nolock if block size != PAGE_SIZE");
3120 goto failed_mount;
3121 }
3122 }
3123
ac27a0ec 3124 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3125 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3126
617ba13b
MC		 3127 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3128 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3129 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3130 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3131 ext4_msg(sb, KERN_WARNING,
3132 "feature flags set on rev 0 fs, "
3133 "running e2fsck is recommended");
469108ff 3134
2035e776
TT		 3135 if (IS_EXT2_SB(sb)) {
3136 if (ext2_feature_set_ok(sb))
3137 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3138 "using the ext4 subsystem");
3139 else {
3140 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3141 "to feature incompatibilities");
3142 goto failed_mount;
3143 }
3144 }
3145
3146 if (IS_EXT3_SB(sb)) {
3147 if (ext3_feature_set_ok(sb))
3148 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3149 "using the ext4 subsystem");
3150 else {
3151 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3152 "to feature incompatibilities");
3153 goto failed_mount;
3154 }
3155 }
3156
ac27a0ec
DK		 3157 /*
3158 * Check feature flags regardless of the revision level, since we
3159 * previously didn't change the revision level when setting the flags,
3160 * so there is a chance incompat flags are set on a rev 0 filesystem.
3161 */
a13fb1a4 3162 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3163 goto failed_mount;
a13fb1a4 3164
617ba13b
MC		 3165 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3166 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3167 ext4_msg(sb, KERN_ERR,
3168 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3169 goto failed_mount;
3170 }
3171
ac27a0ec 3172 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3173 /* Validate the filesystem blocksize */
3174 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3175 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3176 blocksize);
ac27a0ec
DK		 3177 goto failed_mount;
3178 }
3179
2b2d6d01 3180 brelse(bh);
70bbb3e0
AM		 3181 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3182 offset = do_div(logical_sb_block, blocksize);
3183 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3184 if (!bh) {
b31e1552
ES		 3185 ext4_msg(sb, KERN_ERR,
3186 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3187 goto failed_mount;
3188 }
617ba13b 3189 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3190 sbi->s_es = es;
617ba13b 3191 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3192 ext4_msg(sb, KERN_ERR,
3193 "Magic mismatch, very weird!");
ac27a0ec
DK		 3194 goto failed_mount;
3195 }
3196 }
3197
a13fb1a4
ES		 3198 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3199 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3200 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3201 has_huge_files);
3202 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3203
617ba13b
MC		 3204 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3205 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3206 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3207 } else {
3208 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3209 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3210 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3211 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3212 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3213 ext4_msg(sb, KERN_ERR,
3214 "unsupported inode size: %d",
2b2d6d01 3215 sbi->s_inode_size);
ac27a0ec
DK		 3216 goto failed_mount;
3217 }
ef7f3835
KS		 3218 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3219 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3220 }
0b8e58a1 3221
0d1ee42f
AR		 3222 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3223 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3224 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3225 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3226 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3227 ext4_msg(sb, KERN_ERR,
3228 "unsupported descriptor size %lu",
0d1ee42f
AR		 3229 sbi->s_desc_size);
3230 goto failed_mount;
3231 }
3232 } else
3233 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3234
ac27a0ec 3235 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3236 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3237 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3238 goto cantfind_ext4;
0b8e58a1 3239
617ba13b 3240 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3241 if (sbi->s_inodes_per_block == 0)
617ba13b 3242 goto cantfind_ext4;
ac27a0ec
DK		 3243 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3244 sbi->s_inodes_per_block;
0d1ee42f 3245 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3246 sbi->s_sbh = bh;
3247 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3248 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3249 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3250
2b2d6d01 3251 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3252 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3253 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3254 i = le32_to_cpu(es->s_flags);
3255 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3256 sbi->s_hash_unsigned = 3;
3257 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3258#ifdef __CHAR_UNSIGNED__
3259 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3260 sbi->s_hash_unsigned = 3;
3261#else
3262 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3263#endif
f99b2589 3264 }
ac27a0ec 3265
281b5995
TT		 3266 /* Handle clustersize */
3267 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3268 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3269 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3270 if (has_bigalloc) {
3271 if (clustersize < blocksize) {
3272 ext4_msg(sb, KERN_ERR,
3273 "cluster size (%d) smaller than "
3274 "block size (%d)", clustersize, blocksize);
3275 goto failed_mount;
3276 }
3277 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3278 le32_to_cpu(es->s_log_block_size);
3279 sbi->s_clusters_per_group =
3280 le32_to_cpu(es->s_clusters_per_group);
3281 if (sbi->s_clusters_per_group > blocksize * 8) {
3282 ext4_msg(sb, KERN_ERR,
3283 "#clusters per group too big: %lu",
3284 sbi->s_clusters_per_group);
3285 goto failed_mount;
3286 }
3287 if (sbi->s_blocks_per_group !=
3288 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3289 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3290 "clusters per group (%lu) inconsistent",
3291 sbi->s_blocks_per_group,
3292 sbi->s_clusters_per_group);
3293 goto failed_mount;
3294 }
3295 } else {
3296 if (clustersize != blocksize) {
3297 ext4_warning(sb, "fragment/cluster size (%d) != "
3298 "block size (%d)", clustersize,
3299 blocksize);
3300 clustersize = blocksize;
3301 }
3302 if (sbi->s_blocks_per_group > blocksize * 8) {
3303 ext4_msg(sb, KERN_ERR,
3304 "#blocks per group too big: %lu",
3305 sbi->s_blocks_per_group);
3306 goto failed_mount;
3307 }
3308 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3309 sbi->s_cluster_bits = 0;
ac27a0ec 3310 }
281b5995
TT		 3311 sbi->s_cluster_ratio = clustersize / blocksize;
3312
ac27a0ec 3313 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3314 ext4_msg(sb, KERN_ERR,
3315 "#inodes per group too big: %lu",
2b2d6d01 3316 sbi->s_inodes_per_group);
ac27a0ec
DK		 3317 goto failed_mount;
3318 }
3319
bf43d84b
ES		 3320 /*
3321 * Test whether we have more sectors than will fit in sector_t,
3322 * and whether the max offset is addressable by the page cache.
3323 */
5a9ae68a 3324 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3325 ext4_blocks_count(es));
5a9ae68a 3326 if (err) {
b31e1552 3327 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3328 " too large to mount safely on this system");
ac27a0ec 3329 if (sizeof(sector_t) < 8)
90c699a9 3330 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3331 ret = err;
ac27a0ec
DK		 3332 goto failed_mount;
3333 }
3334
617ba13b
MC		 3335 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3336 goto cantfind_ext4;
e7c95593 3337
0f2ddca6
FTN		 3338 /* check blocks count against device size */
3339 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3340 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3341 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3342 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3343 ext4_blocks_count(es), blocks_count);
3344 goto failed_mount;
3345 }
3346
0b8e58a1
AD		 3347 /*
3348 * It makes no sense for the first data block to be beyond the end
3349 * of the filesystem.
3350 */
3351 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3352 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3353 "block %u is beyond end of filesystem (%llu)",
3354 le32_to_cpu(es->s_first_data_block),
3355 ext4_blocks_count(es));
e7c95593
ES		 3356 goto failed_mount;
3357 }
bd81d8ee
LV		 3358 blocks_count = (ext4_blocks_count(es) -
3359 le32_to_cpu(es->s_first_data_block) +
3360 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3361 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3362 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3363 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3364 "(block count %llu, first data block %u, "
b31e1552 3365 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3366 ext4_blocks_count(es),
3367 le32_to_cpu(es->s_first_data_block),
3368 EXT4_BLOCKS_PER_GROUP(sb));
3369 goto failed_mount;
3370 }
bd81d8ee 3371 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3372 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3373 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3374 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3375 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3376 sbi->s_group_desc = ext4_kvmalloc(db_count *
3377 sizeof(struct buffer_head *),
3378 GFP_KERNEL);
ac27a0ec 3379 if (sbi->s_group_desc == NULL) {
b31e1552 3380 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3381 goto failed_mount;
3382 }
3383
9f6200bb
TT		 3384 if (ext4_proc_root)
3385 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3386
66acdcf4
TT		 3387 if (sbi->s_proc)
3388 proc_create_data("options", S_IRUGO, sbi->s_proc,
3389 &ext4_seq_options_fops, sb);
3390
705895b6 3391 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3392
3393 for (i = 0; i < db_count; i++) {
70bbb3e0 3394 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3395 sbi->s_group_desc[i] = sb_bread(sb, block);
3396 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3397 ext4_msg(sb, KERN_ERR,
3398 "can't read group descriptor %d", i);
ac27a0ec
DK		 3399 db_count = i;
3400 goto failed_mount2;
3401 }
3402 }
bfff6873 3403 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3404 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3405 goto failed_mount2;
3406 }
772cb7c8
JS		 3407 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3408 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3409 ext4_msg(sb, KERN_ERR,
3410 "unable to initialize "
3411 "flex_bg meta info!");
772cb7c8
JS		 3412 goto failed_mount2;
3413 }
3414
ac27a0ec
DK		 3415 sbi->s_gdb_count = db_count;
3416 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3417 spin_lock_init(&sbi->s_next_gen_lock);
3418
04496411
TM		 3419 init_timer(&sbi->s_err_report);
3420 sbi->s_err_report.function = print_daily_error_info;
3421 sbi->s_err_report.data = (unsigned long) sb;
3422
57042651 3423 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3424 ext4_count_free_clusters(sb));
ce7e010a
TT		 3425 if (!err) {
3426 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3427 ext4_count_free_inodes(sb));
3428 }
3429 if (!err) {
3430 err = percpu_counter_init(&sbi->s_dirs_counter,
3431 ext4_count_dirs(sb));
3432 }
3433 if (!err) {
57042651 3434 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3435 }
3436 if (err) {
3437 ext4_msg(sb, KERN_ERR, "insufficient memory");
3438 goto failed_mount3;
3439 }
3440
c9de560d 3441 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3442 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3443
ac27a0ec
DK		 3444 /*
3445 * set up enough so that it can read an inode
3446 */
9ca92389
TT		 3447 if (!test_opt(sb, NOLOAD) &&
3448 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3449 sb->s_op = &ext4_sops;
3450 else
3451 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3452 sb->s_export_op = &ext4_export_ops;
3453 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3454#ifdef CONFIG_QUOTA
617ba13b
MC		 3455 sb->s_qcop = &ext4_qctl_operations;
3456 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3457#endif
f2fa2ffc
AK		 3458 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3459
ac27a0ec 3460 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3461 mutex_init(&sbi->s_orphan_lock);
8f82f840 3462 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3463
3464 sb->s_root = NULL;
3465
3466 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3467 EXT4_HAS_INCOMPAT_FEATURE(sb,
3468 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3469
c5e06d10
JL		 3470 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3471 !(sb->s_flags & MS_RDONLY))
3472 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3473 goto failed_mount3;
3474
ac27a0ec
DK		 3475 /*
3476 * The first inode we look at is the journal inode. Don't try
3477 * root first: it may be modified in the journal!
3478 */
3479 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3480 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3481 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3482 goto failed_mount3;
0390131b
FM		 3483 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3484 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3485 ext4_msg(sb, KERN_ERR, "required journal recovery "
3486 "suppressed and not mounted read-only");
744692dc 3487 goto failed_mount_wq;
ac27a0ec 3488 } else {
fd8c37ec 3489 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3490 sbi->s_journal = NULL;
3491 needs_recovery = 0;
3492 goto no_journal;
ac27a0ec
DK		 3493 }
3494
eb40a09c
JS		 3495 if (ext4_blocks_count(es) > 0xffffffffULL &&
3496 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3497 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3498 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3499 goto failed_mount_wq;
eb40a09c
JS		 3500 }
3501
d4da6c9c
LT		 3502 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3503 jbd2_journal_set_features(sbi->s_journal,
3504 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3505 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3506 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3507 jbd2_journal_set_features(sbi->s_journal,
3508 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3509 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3510 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3511 } else {
3512 jbd2_journal_clear_features(sbi->s_journal,
3513 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3514 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3515 }
818d276c 3516
ac27a0ec
DK		 3517 /* We have now updated the journal if required, so we can
3518 * validate the data journaling mode. */
3519 switch (test_opt(sb, DATA_FLAGS)) {
3520 case 0:
3521 /* No mode set, assume a default based on the journal
63f57933
AM		 3522 * capabilities: ORDERED_DATA if the journal can
3523 * cope, else JOURNAL_DATA
3524 */
dab291af
MC		 3525 if (jbd2_journal_check_available_features
3526 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3527 set_opt(sb, ORDERED_DATA);
ac27a0ec 3528 else
fd8c37ec 3529 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3530 break;
3531
617ba13b
MC		 3532 case EXT4_MOUNT_ORDERED_DATA:
3533 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3534 if (!jbd2_journal_check_available_features
3535 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3536 ext4_msg(sb, KERN_ERR, "Journal does not support "
3537 "requested data journaling mode");
744692dc 3538 goto failed_mount_wq;
ac27a0ec
DK		 3539 }
3540 default:
3541 break;
3542 }
b3881f74 3543 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3544
18aadd47
BJ		 3545 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3546
ce7e010a
TT		 3547 /*
3548 * The journal may have updated the bg summary counts, so we
3549 * need to update the global counters.
3550 */
57042651 3551 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3552 ext4_count_free_clusters(sb));
ce7e010a
TT		 3553 percpu_counter_set(&sbi->s_freeinodes_counter,
3554 ext4_count_free_inodes(sb));
3555 percpu_counter_set(&sbi->s_dirs_counter,
3556 ext4_count_dirs(sb));
57042651 3557 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3558
ce7e010a 3559no_journal:
fd89d5f2
TH		 3560 /*
3561 * The maximum number of concurrent works can be high and
3562 * concurrency isn't really necessary. Limit it to 1.
3563 */
3564 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3565 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3566 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3567 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3568 goto failed_mount_wq;
3569 }
3570
ac27a0ec 3571 /*
dab291af 3572 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3573 * so we can safely mount the rest of the filesystem now.
3574 */
3575
1d1fe1ee
DH		 3576 root = ext4_iget(sb, EXT4_ROOT_INO);
3577 if (IS_ERR(root)) {
b31e1552 3578 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3579 ret = PTR_ERR(root);
32a9bb57 3580 root = NULL;
ac27a0ec
DK		 3581 goto failed_mount4;
3582 }
3583 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3584 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3585 iput(root);
ac27a0ec
DK		 3586 goto failed_mount4;
3587 }
48fde701 3588 sb->s_root = d_make_root(root);
1d1fe1ee 3589 if (!sb->s_root) {
b31e1552 3590 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3591 ret = -ENOMEM;
3592 goto failed_mount4;
3593 }
ac27a0ec 3594
2b2d6d01 3595 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3596
3597 /* determine the minimum size of new large inodes, if present */
3598 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3599 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3600 EXT4_GOOD_OLD_INODE_SIZE;
3601 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3602 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3603 if (sbi->s_want_extra_isize <
3604 le16_to_cpu(es->s_want_extra_isize))
3605 sbi->s_want_extra_isize =
3606 le16_to_cpu(es->s_want_extra_isize);
3607 if (sbi->s_want_extra_isize <
3608 le16_to_cpu(es->s_min_extra_isize))
3609 sbi->s_want_extra_isize =
3610 le16_to_cpu(es->s_min_extra_isize);
3611 }
3612 }
3613 /* Check if enough inode space is available */
3614 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3615 sbi->s_inode_size) {
3616 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3617 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3618 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3619 "available");
ef7f3835
KS		 3620 }
3621
6fd058f7
TT		 3622 err = ext4_setup_system_zone(sb);
3623 if (err) {
b31e1552 3624 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3625 "zone (%d)", err);
94bf608a 3626 goto failed_mount4a;
6fd058f7
TT		 3627 }
3628
c2774d84
AK		 3629 ext4_ext_init(sb);
3630 err = ext4_mb_init(sb, needs_recovery);
3631 if (err) {
421f91d2 3632 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3633 err);
dcf2d804 3634 goto failed_mount5;
c2774d84
AK		 3635 }
3636
bfff6873
LC		 3637 err = ext4_register_li_request(sb, first_not_zeroed);
3638 if (err)
dcf2d804 3639 goto failed_mount6;
bfff6873 3640
3197ebdb
TT		 3641 sbi->s_kobj.kset = ext4_kset;
3642 init_completion(&sbi->s_kobj_unregister);
3643 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3644 "%s", sb->s_id);
dcf2d804
TM		 3645 if (err)
3646 goto failed_mount7;
3197ebdb 3647
617ba13b
MC		 3648 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3649 ext4_orphan_cleanup(sb, es);
3650 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3651 if (needs_recovery) {
b31e1552 3652 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3653 ext4_mark_recovery_complete(sb, es);
3654 }
3655 if (EXT4_SB(sb)->s_journal) {
3656 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3657 descr = " journalled data mode";
3658 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3659 descr = " ordered data mode";
3660 else
3661 descr = " writeback data mode";
3662 } else
3663 descr = "out journal";
3664
d4c402d9 3665 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3666 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3667 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3668
66e61a9e
TT		 3669 if (es->s_error_count)
3670 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3671
d4c402d9 3672 kfree(orig_data);
ac27a0ec
DK		 3673 return 0;
3674
617ba13b 3675cantfind_ext4:
ac27a0ec 3676 if (!silent)
b31e1552 3677 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3678 goto failed_mount;
3679
dcf2d804
TM		 3680failed_mount7:
3681 ext4_unregister_li_request(sb);
3682failed_mount6:
dcf2d804 3683 ext4_mb_release(sb);
94bf608a
AV		 3684failed_mount5:
3685 ext4_ext_release(sb);
dcf2d804 3686 ext4_release_system_zone(sb);
94bf608a
AV		 3687failed_mount4a:
3688 dput(sb->s_root);
32a9bb57 3689 sb->s_root = NULL;
94bf608a 3690failed_mount4:
b31e1552 3691 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3692 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3693failed_mount_wq:
0390131b
FM		 3694 if (sbi->s_journal) {
3695 jbd2_journal_destroy(sbi->s_journal);
3696 sbi->s_journal = NULL;
3697 }
ac27a0ec 3698failed_mount3:
04496411 3699 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3700 if (sbi->s_flex_groups)
3701 ext4_kvfree(sbi->s_flex_groups);
57042651 3702 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3703 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3704 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3705 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3706 if (sbi->s_mmp_tsk)
3707 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3708failed_mount2:
3709 for (i = 0; i < db_count; i++)
3710 brelse(sbi->s_group_desc[i]);
f18a5f21 3711 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3712failed_mount:
240799cd 3713 if (sbi->s_proc) {
66acdcf4 3714 remove_proc_entry("options", sbi->s_proc);
9f6200bb 3715 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3716 }
ac27a0ec
DK		 3717#ifdef CONFIG_QUOTA
3718 for (i = 0; i < MAXQUOTAS; i++)
3719 kfree(sbi->s_qf_names[i]);
3720#endif
617ba13b 3721 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3722 brelse(bh);
3723out_fail:
3724 sb->s_fs_info = NULL;
f6830165 3725 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3726 kfree(sbi);
dcc7dae3 3727out_free_orig:
d4c402d9 3728 kfree(orig_data);
1d1fe1ee 3729 return ret;
ac27a0ec
DK		 3730}
3731
3732/*
3733 * Setup any per-fs journal parameters now. We'll do this both on
3734 * initial mount, once the journal has been initialised but before we've
3735 * done any recovery; and again on any subsequent remount.
3736 */
617ba13b 3737static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3738{
617ba13b 3739 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3740
30773840
TT		 3741 journal->j_commit_interval = sbi->s_commit_interval;
3742 journal->j_min_batch_time = sbi->s_min_batch_time;
3743 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3744
a931da6a 3745 write_lock(&journal->j_state_lock);
ac27a0ec 3746 if (test_opt(sb, BARRIER))
dab291af 3747 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3748 else
dab291af 3749 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3750 if (test_opt(sb, DATA_ERR_ABORT))
3751 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3752 else
3753 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3754 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3755}
3756
617ba13b 3757static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3758 unsigned int journal_inum)
3759{
3760 struct inode *journal_inode;
3761 journal_t *journal;
3762
0390131b
FM		 3763 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3764
ac27a0ec
DK		 3765 /* First, test for the existence of a valid inode on disk. Bad
3766 * things happen if we iget() an unused inode, as the subsequent
3767 * iput() will try to delete it. */
3768
1d1fe1ee
DH		 3769 journal_inode = ext4_iget(sb, journal_inum);
3770 if (IS_ERR(journal_inode)) {
b31e1552 3771 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3772 return NULL;
3773 }
3774 if (!journal_inode->i_nlink) {
3775 make_bad_inode(journal_inode);
3776 iput(journal_inode);
b31e1552 3777 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3778 return NULL;
3779 }
3780
e5f8eab8 3781 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3782 journal_inode, journal_inode->i_size);
1d1fe1ee 3783 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3784 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3785 iput(journal_inode);
3786 return NULL;
3787 }
3788
dab291af 3789 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3790 if (!journal) {
b31e1552 3791 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3792 iput(journal_inode);
3793 return NULL;
3794 }
3795 journal->j_private = sb;
617ba13b 3796 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3797 return journal;
3798}
3799
617ba13b 3800static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3801 dev_t j_dev)
3802{
2b2d6d01 3803 struct buffer_head *bh;
ac27a0ec 3804 journal_t *journal;
617ba13b
MC		 3805 ext4_fsblk_t start;
3806 ext4_fsblk_t len;
ac27a0ec 3807 int hblock, blocksize;
617ba13b 3808 ext4_fsblk_t sb_block;
ac27a0ec 3809 unsigned long offset;
2b2d6d01 3810 struct ext4_super_block *es;
ac27a0ec
DK		 3811 struct block_device *bdev;
3812
0390131b
FM		 3813 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3814
b31e1552 3815 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3816 if (bdev == NULL)
3817 return NULL;
3818
ac27a0ec 3819 blocksize = sb->s_blocksize;
e1defc4f 3820 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3821 if (blocksize < hblock) {
b31e1552
ES		 3822 ext4_msg(sb, KERN_ERR,
3823 "blocksize too small for journal device");
ac27a0ec
DK		 3824 goto out_bdev;
3825 }
3826
617ba13b
MC		 3827 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3828 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3829 set_blocksize(bdev, blocksize);
3830 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3831 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3832 "external journal");
ac27a0ec
DK		 3833 goto out_bdev;
3834 }
3835
617ba13b
MC		 3836 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3837 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3838 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3839 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3840 ext4_msg(sb, KERN_ERR, "external journal has "
3841 "bad superblock");
ac27a0ec
DK		 3842 brelse(bh);
3843 goto out_bdev;
3844 }
3845
617ba13b 3846 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3847 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3848 brelse(bh);
3849 goto out_bdev;
3850 }
3851
bd81d8ee 3852 len = ext4_blocks_count(es);
ac27a0ec
DK		 3853 start = sb_block + 1;
3854 brelse(bh); /* we're done with the superblock */
3855
dab291af 3856 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3857 start, len, blocksize);
3858 if (!journal) {
b31e1552 3859 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3860 goto out_bdev;
3861 }
3862 journal->j_private = sb;
3863 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3864 wait_on_buffer(journal->j_sb_buffer);
3865 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3866 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3867 goto out_journal;
3868 }
3869 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3870 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3871 "user (unsupported) - %d",
ac27a0ec
DK		 3872 be32_to_cpu(journal->j_superblock->s_nr_users));
3873 goto out_journal;
3874 }
617ba13b
MC		 3875 EXT4_SB(sb)->journal_bdev = bdev;
3876 ext4_init_journal_params(sb, journal);
ac27a0ec 3877 return journal;
0b8e58a1 3878
ac27a0ec 3879out_journal:
dab291af 3880 jbd2_journal_destroy(journal);
ac27a0ec 3881out_bdev:
617ba13b 3882 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3883 return NULL;
3884}
3885
617ba13b
MC		 3886static int ext4_load_journal(struct super_block *sb,
3887 struct ext4_super_block *es,
ac27a0ec
DK		 3888 unsigned long journal_devnum)
3889{
3890 journal_t *journal;
3891 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3892 dev_t journal_dev;
3893 int err = 0;
3894 int really_read_only;
3895
0390131b
FM		 3896 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3897
ac27a0ec
DK		 3898 if (journal_devnum &&
3899 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3900 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3901 "numbers have changed");
ac27a0ec
DK		 3902 journal_dev = new_decode_dev(journal_devnum);
3903 } else
3904 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3905
3906 really_read_only = bdev_read_only(sb->s_bdev);
3907
3908 /*
3909 * Are we loading a blank journal or performing recovery after a
3910 * crash? For recovery, we need to check in advance whether we
3911 * can get read-write access to the device.
3912 */
617ba13b 3913 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3914 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3915 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3916 "required on readonly filesystem");
ac27a0ec 3917 if (really_read_only) {
b31e1552
ES		 3918 ext4_msg(sb, KERN_ERR, "write access "
3919 "unavailable, cannot proceed");
ac27a0ec
DK		 3920 return -EROFS;
3921 }
b31e1552
ES		 3922 ext4_msg(sb, KERN_INFO, "write access will "
3923 "be enabled during recovery");
ac27a0ec
DK		 3924 }
3925 }
3926
3927 if (journal_inum && journal_dev) {
b31e1552
ES		 3928 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3929 "and inode journals!");
ac27a0ec
DK		 3930 return -EINVAL;
3931 }
3932
3933 if (journal_inum) {
617ba13b 3934 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3935 return -EINVAL;
3936 } else {
617ba13b 3937 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3938 return -EINVAL;
3939 }
3940
90576c0b 3941 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3942 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3943
617ba13b 3944 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3945 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 3946 if (!err) {
3947 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3948 if (save)
3949 memcpy(save, ((char *) es) +
3950 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 3951 err = jbd2_journal_load(journal);
1c13d5c0
TT		 3952 if (save)
3953 memcpy(((char *) es) + EXT4_S_ERR_START,
3954 save, EXT4_S_ERR_LEN);
3955 kfree(save);
3956 }
ac27a0ec
DK		 3957
3958 if (err) {
b31e1552 3959 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3960 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3961 return err;
3962 }
3963
617ba13b
MC		 3964 EXT4_SB(sb)->s_journal = journal;
3965 ext4_clear_journal_err(sb, es);
ac27a0ec 3966
c41303ce 3967 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 3968 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3969 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3970
3971 /* Make sure we flush the recovery flag to disk. */
e2d67052 3972 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3973 }
3974
3975 return 0;
3976}
3977
e2d67052 3978static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3979{
e2d67052 3980 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3981 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3982 int error = 0;
ac27a0ec 3983
7c2e7087 3984 if (!sbh || block_device_ejected(sb))
c4be0c1d 3985 return error;
914258bf
TT		 3986 if (buffer_write_io_error(sbh)) {
3987 /*
3988 * Oh, dear. A previous attempt to write the
3989 * superblock failed. This could happen because the
3990 * USB device was yanked out. Or it could happen to
3991 * be a transient write error and maybe the block will
3992 * be remapped. Nothing we can do but to retry the
3993 * write and hope for the best.
3994 */
b31e1552
ES		 3995 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3996 "superblock detected");
914258bf
TT		 3997 clear_buffer_write_io_error(sbh);
3998 set_buffer_uptodate(sbh);
3999 }
71290b36
TT		 4000 /*
4001 * If the file system is mounted read-only, don't update the
4002 * superblock write time. This avoids updating the superblock
4003 * write time when we are mounting the root file system
4004 * read/only but we need to replay the journal; at that point,
4005 * for people who are east of GMT and who make their clock
4006 * tick in localtime for Windows bug-for-bug compatibility,
4007 * the clock is set in the future, and this will cause e2fsck
4008 * to complain and force a full file system check.
4009 */
4010 if (!(sb->s_flags & MS_RDONLY))
4011 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4012 if (sb->s_bdev->bd_part)
4013 es->s_kbytes_written =
4014 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4015 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4016 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4017 else
4018 es->s_kbytes_written =
4019 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4020 ext4_free_blocks_count_set(es,
4021 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4022 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4023 es->s_free_inodes_count =
4024 cpu_to_le32(percpu_counter_sum_positive(
4025 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4026 sb->s_dirt = 0;
ac27a0ec
DK		 4027 BUFFER_TRACE(sbh, "marking dirty");
4028 mark_buffer_dirty(sbh);
914258bf 4029 if (sync) {
c4be0c1d
TS		 4030 error = sync_dirty_buffer(sbh);
4031 if (error)
4032 return error;
4033
4034 error = buffer_write_io_error(sbh);
4035 if (error) {
b31e1552
ES		 4036 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4037 "superblock");
914258bf
TT		 4038 clear_buffer_write_io_error(sbh);
4039 set_buffer_uptodate(sbh);
4040 }
4041 }
c4be0c1d 4042 return error;
ac27a0ec
DK		 4043}
4044
ac27a0ec
DK		 4045/*
4046 * Have we just finished recovery? If so, and if we are mounting (or
4047 * remounting) the filesystem readonly, then we will end up with a
4048 * consistent fs on disk. Record that fact.
4049 */
2b2d6d01
TT		 4050static void ext4_mark_recovery_complete(struct super_block *sb,
4051 struct ext4_super_block *es)
ac27a0ec 4052{
617ba13b 4053 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4054
0390131b
FM		 4055 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4056 BUG_ON(journal != NULL);
4057 return;
4058 }
dab291af 4059 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4060 if (jbd2_journal_flush(journal) < 0)
4061 goto out;
4062
617ba13b 4063 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4064 sb->s_flags & MS_RDONLY) {
617ba13b 4065 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4066 ext4_commit_super(sb, 1);
ac27a0ec 4067 }
7ffe1ea8
HK		 4068
4069out:
dab291af 4070 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4071}
4072
4073/*
4074 * If we are mounting (or read-write remounting) a filesystem whose journal
4075 * has recorded an error from a previous lifetime, move that error to the
4076 * main filesystem now.
4077 */
2b2d6d01
TT		 4078static void ext4_clear_journal_err(struct super_block *sb,
4079 struct ext4_super_block *es)
ac27a0ec
DK		 4080{
4081 journal_t *journal;
4082 int j_errno;
4083 const char *errstr;
4084
0390131b
FM		 4085 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4086
617ba13b 4087 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4088
4089 /*
4090 * Now check for any error status which may have been recorded in the
617ba13b 4091 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4092 */
4093
dab291af 4094 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4095 if (j_errno) {
4096 char nbuf[16];
4097
617ba13b 4098 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4099 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4100 "from previous mount: %s", errstr);
12062ddd 4101 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4102
617ba13b
MC		 4103 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4104 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4105 ext4_commit_super(sb, 1);
ac27a0ec 4106
dab291af 4107 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4108 }
4109}
4110
4111/*
4112 * Force the running and committing transactions to commit,
4113 * and wait on the commit.
4114 */
617ba13b 4115int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4116{
4117 journal_t *journal;
0390131b 4118 int ret = 0;
ac27a0ec
DK		 4119
4120 if (sb->s_flags & MS_RDONLY)
4121 return 0;
4122
617ba13b 4123 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4124 if (journal) {
437f88cc 4125 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4126 ret = ext4_journal_force_commit(journal);
6b0310fb 4127 }
0390131b 4128
ac27a0ec
DK		 4129 return ret;
4130}
4131
2b2d6d01 4132static void ext4_write_super(struct super_block *sb)
ac27a0ec 4133{
ebc1ac16 4134 lock_super(sb);
9ca92389 4135 ext4_commit_super(sb, 1);
ebc1ac16 4136 unlock_super(sb);
ac27a0ec
DK		 4137}
4138
617ba13b 4139static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4140{
14ce0cb4 4141 int ret = 0;
9eddacf9 4142 tid_t target;
8d5d02e6 4143 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4144
9bffad1e 4145 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4146 flush_workqueue(sbi->dio_unwritten_wq);
4147 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4148 if (wait)
8d5d02e6 4149 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4150 }
14ce0cb4 4151 return ret;
ac27a0ec
DK		 4152}
4153
4154/*
4155 * LVM calls this function before a (read-only) snapshot is created. This
4156 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4157 *
4158 * Note that only this function cannot bring a filesystem to be in a clean
4159 * state independently, because ext4 prevents a new handle from being started
4160 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4161 * the upper layer.
ac27a0ec 4162 */
c4be0c1d 4163static int ext4_freeze(struct super_block *sb)
ac27a0ec 4164{
c4be0c1d
TS		 4165 int error = 0;
4166 journal_t *journal;
ac27a0ec 4167
9ca92389
TT		 4168 if (sb->s_flags & MS_RDONLY)
4169 return 0;
ac27a0ec 4170
9ca92389 4171 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4172
9ca92389
TT		 4173 /* Now we set up the journal barrier. */
4174 jbd2_journal_lock_updates(journal);
ac27a0ec 4175
9ca92389
TT		 4176 /*
4177 * Don't clear the needs_recovery flag if we failed to flush
4178 * the journal.
4179 */
4180 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4181 if (error < 0)
4182 goto out;
9ca92389
TT		 4183
4184 /* Journal blocked and flushed, clear needs_recovery flag. */
4185 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4186 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4187out:
4188 /* we rely on s_frozen to stop further updates */
4189 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4190 return error;
ac27a0ec
DK		 4191}
4192
4193/*
4194 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4195 * flag here, even though the filesystem is not technically dirty yet.
4196 */
c4be0c1d 4197static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4198{
9ca92389
TT		 4199 if (sb->s_flags & MS_RDONLY)
4200 return 0;
4201
4202 lock_super(sb);
4203 /* Reset the needs_recovery flag before the fs is unlocked. */
4204 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4205 ext4_commit_super(sb, 1);
4206 unlock_super(sb);
c4be0c1d 4207 return 0;
ac27a0ec
DK		 4208}
4209
673c6100
TT		 4210/*
4211 * Structure to save mount options for ext4_remount's benefit
4212 */
4213struct ext4_mount_options {
4214 unsigned long s_mount_opt;
a2595b8a 4215 unsigned long s_mount_opt2;
673c6100
TT		 4216 uid_t s_resuid;
4217 gid_t s_resgid;
4218 unsigned long s_commit_interval;
4219 u32 s_min_batch_time, s_max_batch_time;
4220#ifdef CONFIG_QUOTA
4221 int s_jquota_fmt;
4222 char *s_qf_names[MAXQUOTAS];
4223#endif
4224};
4225
2b2d6d01 4226static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4227{
2b2d6d01 4228 struct ext4_super_block *es;
617ba13b 4229 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4230 unsigned long old_sb_flags;
617ba13b 4231 struct ext4_mount_options old_opts;
c79d967d 4232 int enable_quota = 0;
8a266467 4233 ext4_group_t g;
b3881f74 4234 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4235 int err = 0;
ac27a0ec
DK		 4236#ifdef CONFIG_QUOTA
4237 int i;
4238#endif
d4c402d9 4239 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4240
4241 /* Store the original options */
bbd6851a 4242 lock_super(sb);
ac27a0ec
DK		 4243 old_sb_flags = sb->s_flags;
4244 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4245 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4246 old_opts.s_resuid = sbi->s_resuid;
4247 old_opts.s_resgid = sbi->s_resgid;
4248 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4249 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4250 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4251#ifdef CONFIG_QUOTA
4252 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4253 for (i = 0; i < MAXQUOTAS; i++)
4254 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4255#endif
b3881f74
TT		 4256 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4257 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4258
4259 /*
4260 * Allow the "check" option to be passed as a remount option.
4261 */
661aa520 4262 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4263 err = -EINVAL;
4264 goto restore_opts;
4265 }
4266
4ab2f15b 4267 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4268 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4269
4270 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4271 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4272
4273 es = sbi->s_es;
4274
b3881f74 4275 if (sbi->s_journal) {
0390131b 4276 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4277 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4278 }
ac27a0ec 4279
661aa520 4280 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4281 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4282 err = -EROFS;
4283 goto restore_opts;
4284 }
4285
4286 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4287 err = dquot_suspend(sb, -1);
4288 if (err < 0)
c79d967d 4289 goto restore_opts;
c79d967d 4290
ac27a0ec
DK		 4291 /*
4292 * First of all, the unconditional stuff we have to do
4293 * to disable replay of the journal when we next remount
4294 */
4295 sb->s_flags |= MS_RDONLY;
4296
4297 /*
4298 * OK, test if we are remounting a valid rw partition
4299 * readonly, and if so set the rdonly flag and then
4300 * mark the partition as valid again.
4301 */
617ba13b
MC		 4302 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4303 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4304 es->s_state = cpu_to_le16(sbi->s_mount_state);
4305
a63c9eb2 4306 if (sbi->s_journal)
0390131b 4307 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4308 } else {
a13fb1a4
ES		 4309 /* Make sure we can mount this feature set readwrite */
4310 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4311 err = -EROFS;
4312 goto restore_opts;
4313 }
8a266467
TT		 4314 /*
4315 * Make sure the group descriptor checksums
0b8e58a1 4316 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4317 */
4318 for (g = 0; g < sbi->s_groups_count; g++) {
4319 struct ext4_group_desc *gdp =
4320 ext4_get_group_desc(sb, g, NULL);
4321
4322 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4323 ext4_msg(sb, KERN_ERR,
4324 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4325 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4326 le16_to_cpu(gdp->bg_checksum));
4327 err = -EINVAL;
4328 goto restore_opts;
4329 }
4330 }
4331
ead6596b
ES		 4332 /*
4333 * If we have an unprocessed orphan list hanging
4334 * around from a previously readonly bdev mount,
4335 * require a full umount/remount for now.
4336 */
4337 if (es->s_last_orphan) {
b31e1552 4338 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4339 "remount RDWR because of unprocessed "
4340 "orphan inode list. Please "
b31e1552 4341 "umount/remount instead");
ead6596b
ES		 4342 err = -EINVAL;
4343 goto restore_opts;
4344 }
4345
ac27a0ec
DK		 4346 /*
4347 * Mounting a RDONLY partition read-write, so reread
4348 * and store the current valid flag. (It may have
4349 * been changed by e2fsck since we originally mounted
4350 * the partition.)
4351 */
0390131b
FM		 4352 if (sbi->s_journal)
4353 ext4_clear_journal_err(sb, es);
ac27a0ec 4354 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4355 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4356 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4357 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4358 EXT4_FEATURE_INCOMPAT_MMP))
4359 if (ext4_multi_mount_protect(sb,
4360 le64_to_cpu(es->s_mmp_block))) {
4361 err = -EROFS;
4362 goto restore_opts;
4363 }
c79d967d 4364 enable_quota = 1;
ac27a0ec
DK		 4365 }
4366 }
bfff6873
LC		 4367
4368 /*
4369 * Reinitialize lazy itable initialization thread based on
4370 * current settings
4371 */
4372 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4373 ext4_unregister_li_request(sb);
4374 else {
4375 ext4_group_t first_not_zeroed;
4376 first_not_zeroed = ext4_has_uninit_itable(sb);
4377 ext4_register_li_request(sb, first_not_zeroed);
4378 }
4379
6fd058f7 4380 ext4_setup_system_zone(sb);
0390131b 4381 if (sbi->s_journal == NULL)
e2d67052 4382 ext4_commit_super(sb, 1);
0390131b 4383
ac27a0ec
DK		 4384#ifdef CONFIG_QUOTA
4385 /* Release old quota file names */
4386 for (i = 0; i < MAXQUOTAS; i++)
4387 if (old_opts.s_qf_names[i] &&
4388 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4389 kfree(old_opts.s_qf_names[i]);
4390#endif
bbd6851a 4391 unlock_super(sb);
c79d967d 4392 if (enable_quota)
0f0dd62f 4393 dquot_resume(sb, -1);
d4c402d9
CW		 4394
4395 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4396 kfree(orig_data);
ac27a0ec 4397 return 0;
0b8e58a1 4398
ac27a0ec
DK		 4399restore_opts:
4400 sb->s_flags = old_sb_flags;
4401 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4402 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4403 sbi->s_resuid = old_opts.s_resuid;
4404 sbi->s_resgid = old_opts.s_resgid;
4405 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4406 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4407 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4408#ifdef CONFIG_QUOTA
4409 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4410 for (i = 0; i < MAXQUOTAS; i++) {
4411 if (sbi->s_qf_names[i] &&
4412 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4413 kfree(sbi->s_qf_names[i]);
4414 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4415 }
4416#endif
bbd6851a 4417 unlock_super(sb);
d4c402d9 4418 kfree(orig_data);
ac27a0ec
DK		 4419 return err;
4420}
4421
f975d6bc
TT		 4422/*
4423 * Note: calculating the overhead so we can be compatible with
4424 * historical BSD practice is quite difficult in the face of
4425 * clusters/bigalloc. This is because multiple metadata blocks from
4426 * different block group can end up in the same allocation cluster.
4427 * Calculating the exact overhead in the face of clustered allocation
4428 * requires either O(all block bitmaps) in memory or O(number of block
4429 * groups**2) in time. We will still calculate the superblock for
4430 * older file systems --- and if we come across with a bigalloc file
4431 * system with zero in s_overhead_clusters the estimate will be close to
4432 * correct especially for very large cluster sizes --- but for newer
4433 * file systems, it's better to calculate this figure once at mkfs
4434 * time, and store it in the superblock. If the superblock value is
4435 * present (even for non-bigalloc file systems), we will use it.
4436 */
2b2d6d01 4437static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4438{
4439 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4440 struct ext4_sb_info *sbi = EXT4_SB(sb);
4441 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4442 struct ext4_group_desc *gdp;
960cc398 4443 u64 fsid;
d02a9391 4444 s64 bfree;
ac27a0ec 4445
5e70030d
BP		 4446 if (test_opt(sb, MINIX_DF)) {
4447 sbi->s_overhead_last = 0;
f975d6bc
TT		 4448 } else if (es->s_overhead_clusters) {
4449 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4450 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4451 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4452 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4453
4454 /*
5e70030d
BP		 4455 * Compute the overhead (FS structures). This is constant
4456 * for a given filesystem unless the number of block groups
4457 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4458 */
4459
4460 /*
4461 * All of the blocks before first_data_block are
4462 * overhead
4463 */
f975d6bc 4464 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4465
4466 /*
f975d6bc 4467 * Add the overhead found in each block group
ac27a0ec
DK		 4468 */
4469 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4470 gdp = ext4_get_group_desc(sb, i, NULL);
4471 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4472 cond_resched();
4473 }
5e70030d
BP		 4474 sbi->s_overhead_last = overhead;
4475 smp_wmb();
6bc9feff 4476 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4477 }
4478
617ba13b 4479 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4480 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4481 buf->f_blocks = (ext4_blocks_count(es) -
4482 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4483 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4484 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4485 /* prevent underflow in case that few free space is available */
57042651 4486 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4487 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4488 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4489 buf->f_bavail = 0;
4490 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4491 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4492 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4493 fsid = le64_to_cpup((void *)es->s_uuid) ^
4494 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4495 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4496 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4497
ac27a0ec
DK		 4498 return 0;
4499}
4500
0b8e58a1
AD		 4501/* Helper function for writing quotas on sync - we need to start transaction
4502 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4503 * Process 1 Process 2
617ba13b 4504 * ext4_create() quota_sync()
a269eb18 4505 * jbd2_journal_start() write_dquot()
871a2931 4506 * dquot_initialize() down(dqio_mutex)
dab291af 4507 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4508 *
4509 */
4510
4511#ifdef CONFIG_QUOTA
4512
4513static inline struct inode *dquot_to_inode(struct dquot *dquot)
4514{
4515 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4516}
4517
617ba13b 4518static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4519{
4520 int ret, err;
4521 handle_t *handle;
4522 struct inode *inode;
4523
4524 inode = dquot_to_inode(dquot);
617ba13b 4525 handle = ext4_journal_start(inode,
0b8e58a1 4526 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4527 if (IS_ERR(handle))
4528 return PTR_ERR(handle);
4529 ret = dquot_commit(dquot);
617ba13b 4530 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4531 if (!ret)
4532 ret = err;
4533 return ret;
4534}
4535
617ba13b 4536static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4537{
4538 int ret, err;
4539 handle_t *handle;
4540
617ba13b 4541 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4542 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4543 if (IS_ERR(handle))
4544 return PTR_ERR(handle);
4545 ret = dquot_acquire(dquot);
617ba13b 4546 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4547 if (!ret)
4548 ret = err;
4549 return ret;
4550}
4551
617ba13b 4552static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4553{
4554 int ret, err;
4555 handle_t *handle;
4556
617ba13b 4557 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4558 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4559 if (IS_ERR(handle)) {
4560 /* Release dquot anyway to avoid endless cycle in dqput() */
4561 dquot_release(dquot);
ac27a0ec 4562 return PTR_ERR(handle);
9c3013e9 4563 }
ac27a0ec 4564 ret = dquot_release(dquot);
617ba13b 4565 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4566 if (!ret)
4567 ret = err;
4568 return ret;
4569}
4570
617ba13b 4571static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4572{
2c8be6b2 4573 /* Are we journaling quotas? */
617ba13b
MC		 4574 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4575 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4576 dquot_mark_dquot_dirty(dquot);
617ba13b 4577 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4578 } else {
4579 return dquot_mark_dquot_dirty(dquot);
4580 }
4581}
4582
617ba13b 4583static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4584{
4585 int ret, err;
4586 handle_t *handle;
4587
4588 /* Data block + inode block */
617ba13b 4589 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4590 if (IS_ERR(handle))
4591 return PTR_ERR(handle);
4592 ret = dquot_commit_info(sb, type);
617ba13b 4593 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4594 if (!ret)
4595 ret = err;
4596 return ret;
4597}
4598
4599/*
4600 * Turn on quotas during mount time - we need to find
4601 * the quota file and such...
4602 */
617ba13b 4603static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4604{
287a8095
CH		 4605 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4606 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4607}
4608
4609/*
4610 * Standard function to be called on quota_on
4611 */
617ba13b 4612static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4613 struct path *path)
ac27a0ec
DK		 4614{
4615 int err;
ac27a0ec
DK		 4616
4617 if (!test_opt(sb, QUOTA))
4618 return -EINVAL;
0623543b 4619
ac27a0ec 4620 /* Quotafile not on the same filesystem? */
d8c9584e 4621 if (path->dentry->d_sb != sb)
ac27a0ec 4622 return -EXDEV;
0623543b
JK		 4623 /* Journaling quota? */
4624 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4625 /* Quotafile not in fs root? */
f00c9e44 4626 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4627 ext4_msg(sb, KERN_WARNING,
4628 "Quota file not on filesystem root. "
4629 "Journaled quota will not work");
2b2d6d01 4630 }
0623543b
JK		 4631
4632 /*
4633 * When we journal data on quota file, we have to flush journal to see
4634 * all updates to the file when we bypass pagecache...
4635 */
0390131b 4636 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4637 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4638 /*
4639 * We don't need to lock updates but journal_flush() could
4640 * otherwise be livelocked...
4641 */
4642 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4643 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4644 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4645 if (err)
7ffe1ea8 4646 return err;
0623543b
JK		 4647 }
4648
f00c9e44 4649 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4650}
4651
ca0e05e4
DM		 4652static int ext4_quota_off(struct super_block *sb, int type)
4653{
21f97697
JK		 4654 struct inode *inode = sb_dqopt(sb)->files[type];
4655 handle_t *handle;
4656
87009d86
DM		 4657 /* Force all delayed allocation blocks to be allocated.
4658 * Caller already holds s_umount sem */
4659 if (test_opt(sb, DELALLOC))
ca0e05e4 4660 sync_filesystem(sb);
ca0e05e4 4661
0b268590
AG		 4662 if (!inode)
4663 goto out;
4664
21f97697
JK		 4665 /* Update modification times of quota files when userspace can
4666 * start looking at them */
4667 handle = ext4_journal_start(inode, 1);
4668 if (IS_ERR(handle))
4669 goto out;
4670 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4671 ext4_mark_inode_dirty(handle, inode);
4672 ext4_journal_stop(handle);
4673
4674out:
ca0e05e4
DM		 4675 return dquot_quota_off(sb, type);
4676}
4677
ac27a0ec
DK		 4678/* Read data from quotafile - avoid pagecache and such because we cannot afford
4679 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4680 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4681 * we don't have to be afraid of races */
617ba13b 4682static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4683 size_t len, loff_t off)
4684{
4685 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4686 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4687 int err = 0;
4688 int offset = off & (sb->s_blocksize - 1);
4689 int tocopy;
4690 size_t toread;
4691 struct buffer_head *bh;
4692 loff_t i_size = i_size_read(inode);
4693
4694 if (off > i_size)
4695 return 0;
4696 if (off+len > i_size)
4697 len = i_size-off;
4698 toread = len;
4699 while (toread > 0) {
4700 tocopy = sb->s_blocksize - offset < toread ?
4701 sb->s_blocksize - offset : toread;
617ba13b 4702 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4703 if (err)
4704 return err;
4705 if (!bh) /* A hole? */
4706 memset(data, 0, tocopy);
4707 else
4708 memcpy(data, bh->b_data+offset, tocopy);
4709 brelse(bh);
4710 offset = 0;
4711 toread -= tocopy;
4712 data += tocopy;
4713 blk++;
4714 }
4715 return len;
4716}
4717
4718/* Write to quotafile (we know the transaction is already started and has
4719 * enough credits) */
617ba13b 4720static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4721 const char *data, size_t len, loff_t off)
4722{
4723 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4724 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4725 int err = 0;
4726 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4727 struct buffer_head *bh;
4728 handle_t *handle = journal_current_handle();
4729
0390131b 4730 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4731 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4732 " cancelled because transaction is not started",
9c3013e9
JK		 4733 (unsigned long long)off, (unsigned long long)len);
4734 return -EIO;
4735 }
67eeb568
DM		 4736 /*
4737 * Since we account only one data block in transaction credits,
4738 * then it is impossible to cross a block boundary.
4739 */
4740 if (sb->s_blocksize - offset < len) {
4741 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4742 " cancelled because not block aligned",
4743 (unsigned long long)off, (unsigned long long)len);
4744 return -EIO;
4745 }
4746
ac27a0ec 4747 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4748 bh = ext4_bread(handle, inode, blk, 1, &err);
4749 if (!bh)
4750 goto out;
62d2b5f2
JK		 4751 err = ext4_journal_get_write_access(handle, bh);
4752 if (err) {
4753 brelse(bh);
4754 goto out;
ac27a0ec 4755 }
67eeb568
DM		 4756 lock_buffer(bh);
4757 memcpy(bh->b_data+offset, data, len);
4758 flush_dcache_page(bh->b_page);
4759 unlock_buffer(bh);
62d2b5f2 4760 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4761 brelse(bh);
ac27a0ec 4762out:
67eeb568 4763 if (err) {
4d04e4fb 4764 mutex_unlock(&inode->i_mutex);
ac27a0ec 4765 return err;
4d04e4fb 4766 }
67eeb568
DM		 4767 if (inode->i_size < off + len) {
4768 i_size_write(inode, off + len);
617ba13b 4769 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4770 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4771 }
ac27a0ec 4772 mutex_unlock(&inode->i_mutex);
67eeb568 4773 return len;
ac27a0ec
DK		 4774}
4775
4776#endif
4777
152a0836
AV		 4778static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4779 const char *dev_name, void *data)
ac27a0ec 4780{
152a0836 4781 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4782}
4783
37f328eb 4784#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4785static inline void register_as_ext2(void)
4786{
4787 int err = register_filesystem(&ext2_fs_type);
4788 if (err)
4789 printk(KERN_WARNING
4790 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4791}
4792
4793static inline void unregister_as_ext2(void)
4794{
4795 unregister_filesystem(&ext2_fs_type);
4796}
2035e776
TT		 4797
4798static inline int ext2_feature_set_ok(struct super_block *sb)
4799{
4800 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4801 return 0;
4802 if (sb->s_flags & MS_RDONLY)
4803 return 1;
4804 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4805 return 0;
4806 return 1;
4807}
51b7e3c9 4808MODULE_ALIAS("ext2");
24b58424
TT		 4809#else
4810static inline void register_as_ext2(void) { }
4811static inline void unregister_as_ext2(void) { }
2035e776 4812static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4813#endif
4814
37f328eb 4815#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4816static inline void register_as_ext3(void)
4817{
4818 int err = register_filesystem(&ext3_fs_type);
4819 if (err)
4820 printk(KERN_WARNING
4821 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4822}
4823
4824static inline void unregister_as_ext3(void)
4825{
4826 unregister_filesystem(&ext3_fs_type);
4827}
2035e776
TT		 4828
4829static inline int ext3_feature_set_ok(struct super_block *sb)
4830{
4831 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4832 return 0;
4833 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4834 return 0;
4835 if (sb->s_flags & MS_RDONLY)
4836 return 1;
4837 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4838 return 0;
4839 return 1;
4840}
51b7e3c9 4841MODULE_ALIAS("ext3");
24b58424
TT		 4842#else
4843static inline void register_as_ext3(void) { }
4844static inline void unregister_as_ext3(void) { }
2035e776 4845static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4846#endif
4847
03010a33
TT		 4848static struct file_system_type ext4_fs_type = {
4849 .owner = THIS_MODULE,
4850 .name = "ext4",
152a0836 4851 .mount = ext4_mount,
03010a33
TT		 4852 .kill_sb = kill_block_super,
4853 .fs_flags = FS_REQUIRES_DEV,
4854};
4855
8f021222 4856static int __init ext4_init_feat_adverts(void)
857ac889
LC		 4857{
4858 struct ext4_features *ef;
4859 int ret = -ENOMEM;
4860
4861 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4862 if (!ef)
4863 goto out;
4864
4865 ef->f_kobj.kset = ext4_kset;
4866 init_completion(&ef->f_kobj_unregister);
4867 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4868 "features");
4869 if (ret) {
4870 kfree(ef);
4871 goto out;
4872 }
4873
4874 ext4_feat = ef;
4875 ret = 0;
4876out:
4877 return ret;
4878}
4879
8f021222
LC		 4880static void ext4_exit_feat_adverts(void)
4881{
4882 kobject_put(&ext4_feat->f_kobj);
4883 wait_for_completion(&ext4_feat->f_kobj_unregister);
4884 kfree(ext4_feat);
4885}
4886
e9e3bcec
ES		 4887/* Shared across all ext4 file systems */
4888wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4889struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4890
5dabfc78 4891static int __init ext4_init_fs(void)
ac27a0ec 4892{
e9e3bcec 4893 int i, err;
c9de560d 4894
07c0c5d8
AV		 4895 ext4_li_info = NULL;
4896 mutex_init(&ext4_li_mtx);
4897
12e9b892 4898 ext4_check_flag_values();
e9e3bcec
ES		 4899
4900 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4901 mutex_init(&ext4__aio_mutex[i]);
4902 init_waitqueue_head(&ext4__ioend_wq[i]);
4903 }
4904
5dabfc78 4905 err = ext4_init_pageio();
6fd058f7
TT		 4906 if (err)
4907 return err;
5dabfc78 4908 err = ext4_init_system_zone();
bd2d0210 4909 if (err)
d44651d0 4910 goto out6;
3197ebdb
TT		 4911 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4912 if (!ext4_kset)
dd68314c 4913 goto out5;
d44651d0 4914 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 4915
4916 err = ext4_init_feat_adverts();
dd68314c
TT		 4917 if (err)
4918 goto out4;
857ac889 4919
5dabfc78 4920 err = ext4_init_mballoc();
ac27a0ec 4921 if (err)
6fd058f7 4922 goto out3;
c9de560d 4923
5dabfc78 4924 err = ext4_init_xattr();
c9de560d
AT		 4925 if (err)
4926 goto out2;
ac27a0ec
DK		 4927 err = init_inodecache();
4928 if (err)
4929 goto out1;
24b58424 4930 register_as_ext3();
2035e776 4931 register_as_ext2();
03010a33 4932 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4933 if (err)
4934 goto out;
bfff6873 4935
ac27a0ec
DK		 4936 return 0;
4937out:
24b58424
TT		 4938 unregister_as_ext2();
4939 unregister_as_ext3();
ac27a0ec
DK		 4940 destroy_inodecache();
4941out1:
5dabfc78 4942 ext4_exit_xattr();
c9de560d 4943out2:
5dabfc78 4944 ext4_exit_mballoc();
6fd058f7 4945out3:
8f021222 4946 ext4_exit_feat_adverts();
dd68314c 4947out4:
d44651d0
FJ		 4948 if (ext4_proc_root)
4949 remove_proc_entry("fs/ext4", NULL);
6fd058f7 4950 kset_unregister(ext4_kset);
d44651d0 4951out5:
5dabfc78 4952 ext4_exit_system_zone();
d44651d0 4953out6:
5dabfc78 4954 ext4_exit_pageio();
ac27a0ec
DK		 4955 return err;
4956}
4957
5dabfc78 4958static void __exit ext4_exit_fs(void)
ac27a0ec 4959{
bfff6873 4960 ext4_destroy_lazyinit_thread();
24b58424
TT		 4961 unregister_as_ext2();
4962 unregister_as_ext3();
03010a33 4963 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4964 destroy_inodecache();
5dabfc78
TT		 4965 ext4_exit_xattr();
4966 ext4_exit_mballoc();
8f021222 4967 ext4_exit_feat_adverts();
9f6200bb 4968 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4969 kset_unregister(ext4_kset);
5dabfc78
TT		 4970 ext4_exit_system_zone();
4971 ext4_exit_pageio();
ac27a0ec
DK		 4972}
4973
4974MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4975MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4976MODULE_LICENSE("GPL");
5dabfc78
TT		 4977module_init(ext4_init_fs)
4978module_exit(ext4_exit_fs)
Linux kernel - Deliverables
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