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ext4: add debugging /proc file showing file system options
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
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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
90c7201b
TT		 379 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
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
TT		 518 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
519 inode->i_sb->s_id, function, line, inode->i_ino);
520 if (block)
f7c21177
TT		 521 printk(KERN_CONT "block %llu: ", block);
522 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
273df556
FM		 523 va_end(args);
524
525 ext4_handle_error(inode->i_sb);
526}
527
c398eda0 528void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 529 unsigned int line, ext4_fsblk_t block,
530 const char *fmt, ...)
273df556
FM		 531{
532 va_list args;
f7c21177 533 struct va_format vaf;
1c13d5c0 534 struct ext4_super_block *es;
273df556
FM		 535 struct inode *inode = file->f_dentry->d_inode;
536 char pathname[80], *path;
537
1c13d5c0
TT		 538 es = EXT4_SB(inode->i_sb)->s_es;
539 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
540 save_error_info(inode->i_sb, function, line);
273df556 541 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 542 if (IS_ERR(path))
273df556
FM		 543 path = "(unknown)";
544 printk(KERN_CRIT
f7c21177
TT		 545 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
546 inode->i_sb->s_id, function, line, inode->i_ino);
547 if (block)
548 printk(KERN_CONT "block %llu: ", block);
549 va_start(args, fmt);
550 vaf.fmt = fmt;
551 vaf.va = &args;
552 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
273df556
FM		 553 va_end(args);
554
555 ext4_handle_error(inode->i_sb);
556}
557
2b2d6d01 558static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 559 char nbuf[16])
560{
561 char *errstr = NULL;
562
563 switch (errno) {
564 case -EIO:
565 errstr = "IO failure";
566 break;
567 case -ENOMEM:
568 errstr = "Out of memory";
569 break;
570 case -EROFS:
78f1ddbb
TT		 571 if (!sb || (EXT4_SB(sb)->s_journal &&
572 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 573 errstr = "Journal has aborted";
574 else
575 errstr = "Readonly filesystem";
576 break;
577 default:
578 /* If the caller passed in an extra buffer for unknown
579 * errors, textualise them now. Else we just return
580 * NULL. */
581 if (nbuf) {
582 /* Check for truncated error codes... */
583 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
584 errstr = nbuf;
585 }
586 break;
587 }
588
589 return errstr;
590}
591
617ba13b 592/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 593 * automatically and invokes the appropriate error response. */
594
c398eda0
TT		 595void __ext4_std_error(struct super_block *sb, const char *function,
596 unsigned int line, int errno)
ac27a0ec
DK		 597{
598 char nbuf[16];
599 const char *errstr;
600
601 /* Special case: if the error is EROFS, and we're not already
602 * inside a transaction, then there's really no point in logging
603 * an error. */
604 if (errno == -EROFS && journal_current_handle() == NULL &&
605 (sb->s_flags & MS_RDONLY))
606 return;
607
617ba13b 608 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 609 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
610 sb->s_id, function, line, errstr);
1c13d5c0 611 save_error_info(sb, function, line);
ac27a0ec 612
617ba13b 613 ext4_handle_error(sb);
ac27a0ec
DK		 614}
615
616/*
617ba13b 617 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 618 * abort function may be used to deal with unrecoverable failures such
619 * as journal IO errors or ENOMEM at a critical moment in log management.
620 *
621 * We unconditionally force the filesystem into an ABORT|READONLY state,
622 * unless the error response on the fs has been set to panic in which
623 * case we take the easy way out and panic immediately.
624 */
625
c67d859e 626void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 627 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 628{
629 va_list args;
630
1c13d5c0 631 save_error_info(sb, function, line);
ac27a0ec 632 va_start(args, fmt);
c398eda0
TT		 633 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
634 function, line);
ac27a0ec
DK		 635 vprintk(fmt, args);
636 printk("\n");
637 va_end(args);
638
1c13d5c0
TT		 639 if ((sb->s_flags & MS_RDONLY) == 0) {
640 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
641 sb->s_flags |= MS_RDONLY;
642 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
643 if (EXT4_SB(sb)->s_journal)
644 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
645 save_error_info(sb, function, line);
646 }
ac27a0ec 647 if (test_opt(sb, ERRORS_PANIC))
617ba13b 648 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 649}
650
0ff2ea7d 651void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 652{
0ff2ea7d 653 struct va_format vaf;
b31e1552
ES		 654 va_list args;
655
656 va_start(args, fmt);
0ff2ea7d
JP		 657 vaf.fmt = fmt;
658 vaf.va = &args;
659 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 660 va_end(args);
661}
662
12062ddd 663void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 664 unsigned int line, const char *fmt, ...)
ac27a0ec 665{
0ff2ea7d 666 struct va_format vaf;
ac27a0ec
DK		 667 va_list args;
668
669 va_start(args, fmt);
0ff2ea7d
JP		 670 vaf.fmt = fmt;
671 vaf.va = &args;
672 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
673 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 674 va_end(args);
675}
676
e29136f8
TT		 677void __ext4_grp_locked_error(const char *function, unsigned int line,
678 struct super_block *sb, ext4_group_t grp,
679 unsigned long ino, ext4_fsblk_t block,
680 const char *fmt, ...)
5d1b1b3f
AK		 681__releases(bitlock)
682__acquires(bitlock)
683{
0ff2ea7d 684 struct va_format vaf;
5d1b1b3f
AK		 685 va_list args;
686 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
687
1c13d5c0
TT		 688 es->s_last_error_ino = cpu_to_le32(ino);
689 es->s_last_error_block = cpu_to_le64(block);
690 __save_error_info(sb, function, line);
0ff2ea7d 691
5d1b1b3f 692 va_start(args, fmt);
0ff2ea7d
JP		 693
694 vaf.fmt = fmt;
695 vaf.va = &args;
21149d61 696 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 697 sb->s_id, function, line, grp);
698 if (ino)
0ff2ea7d 699 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 700 if (block)
0ff2ea7d
JP		 701 printk(KERN_CONT "block %llu:", (unsigned long long) block);
702 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 703 va_end(args);
704
705 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 706 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 707 return;
708 }
1c13d5c0 709
5d1b1b3f
AK		 710 ext4_unlock_group(sb, grp);
711 ext4_handle_error(sb);
712 /*
713 * We only get here in the ERRORS_RO case; relocking the group
714 * may be dangerous, but nothing bad will happen since the
715 * filesystem will have already been marked read/only and the
716 * journal has been aborted. We return 1 as a hint to callers
717 * who might what to use the return value from
25985edc 718 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 719 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
720 * aggressively from the ext4 function in question, with a
721 * more appropriate error code.
722 */
723 ext4_lock_group(sb, grp);
724 return;
725}
726
617ba13b 727void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 728{
617ba13b 729 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 730
617ba13b 731 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 732 return;
733
12062ddd 734 ext4_warning(sb,
ac27a0ec
DK		 735 "updating to rev %d because of new feature flag, "
736 "running e2fsck is recommended",
617ba13b 737 EXT4_DYNAMIC_REV);
ac27a0ec 738
617ba13b
MC		 739 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
740 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
741 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 742 /* leave es->s_feature_*compat flags alone */
743 /* es->s_uuid will be set by e2fsck if empty */
744
745 /*
746 * The rest of the superblock fields should be zero, and if not it
747 * means they are likely already in use, so leave them alone. We
748 * can leave it up to e2fsck to clean up any inconsistencies there.
749 */
750}
751
752/*
753 * Open the external journal device
754 */
b31e1552 755static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 756{
757 struct block_device *bdev;
758 char b[BDEVNAME_SIZE];
759
d4d77629 760 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 761 if (IS_ERR(bdev))
762 goto fail;
763 return bdev;
764
765fail:
b31e1552 766 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 767 __bdevname(dev, b), PTR_ERR(bdev));
768 return NULL;
769}
770
771/*
772 * Release the journal device
773 */
617ba13b 774static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 775{
e525fd89 776 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 777}
778
617ba13b 779static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 780{
781 struct block_device *bdev;
782 int ret = -ENODEV;
783
784 bdev = sbi->journal_bdev;
785 if (bdev) {
617ba13b 786 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 787 sbi->journal_bdev = NULL;
788 }
789 return ret;
790}
791
792static inline struct inode *orphan_list_entry(struct list_head *l)
793{
617ba13b 794 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 795}
796
617ba13b 797static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 798{
799 struct list_head *l;
800
b31e1552
ES		 801 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
802 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 803
804 printk(KERN_ERR "sb_info orphan list:\n");
805 list_for_each(l, &sbi->s_orphan) {
806 struct inode *inode = orphan_list_entry(l);
807 printk(KERN_ERR " "
808 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
809 inode->i_sb->s_id, inode->i_ino, inode,
810 inode->i_mode, inode->i_nlink,
811 NEXT_ORPHAN(inode));
812 }
813}
814
2b2d6d01 815static void ext4_put_super(struct super_block *sb)
ac27a0ec 816{
617ba13b
MC		 817 struct ext4_sb_info *sbi = EXT4_SB(sb);
818 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 819 int i, err;
ac27a0ec 820
857ac889 821 ext4_unregister_li_request(sb);
e0ccfd95
CH		 822 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
823
4c0425ff
MC		 824 flush_workqueue(sbi->dio_unwritten_wq);
825 destroy_workqueue(sbi->dio_unwritten_wq);
826
a9e220f8 827 lock_super(sb);
8c85e125 828 if (sb->s_dirt)
ebc1ac16 829 ext4_commit_super(sb, 1);
8c85e125 830
0390131b
FM		 831 if (sbi->s_journal) {
832 err = jbd2_journal_destroy(sbi->s_journal);
833 sbi->s_journal = NULL;
834 if (err < 0)
c67d859e 835 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 836 }
d4edac31 837
a1c6c569 838 del_timer(&sbi->s_err_report);
d4edac31
JB		 839 ext4_release_system_zone(sb);
840 ext4_mb_release(sb);
841 ext4_ext_release(sb);
842 ext4_xattr_put_super(sb);
843
ac27a0ec 844 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 845 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 846 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 847 ext4_commit_super(sb, 1);
ac27a0ec 848 }
240799cd 849 if (sbi->s_proc) {
66acdcf4 850 remove_proc_entry("options", sbi->s_proc);
9f6200bb 851 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 852 }
3197ebdb 853 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 854
855 for (i = 0; i < sbi->s_gdb_count; i++)
856 brelse(sbi->s_group_desc[i]);
f18a5f21 857 ext4_kvfree(sbi->s_group_desc);
9933fc0a 858 ext4_kvfree(sbi->s_flex_groups);
57042651 859 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 860 percpu_counter_destroy(&sbi->s_freeinodes_counter);
861 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 862 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 863 brelse(sbi->s_sbh);
864#ifdef CONFIG_QUOTA
865 for (i = 0; i < MAXQUOTAS; i++)
866 kfree(sbi->s_qf_names[i]);
867#endif
868
869 /* Debugging code just in case the in-memory inode orphan list
870 * isn't empty. The on-disk one can be non-empty if we've
871 * detected an error and taken the fs readonly, but the
872 * in-memory list had better be clean by this point. */
873 if (!list_empty(&sbi->s_orphan))
874 dump_orphan_list(sb, sbi);
875 J_ASSERT(list_empty(&sbi->s_orphan));
876
f98393a6 877 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 878 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
879 /*
880 * Invalidate the journal device's buffers. We don't want them
881 * floating about in memory - the physical journal device may
882 * hotswapped, and it breaks the `ro-after' testing code.
883 */
884 sync_blockdev(sbi->journal_bdev);
f98393a6 885 invalidate_bdev(sbi->journal_bdev);
617ba13b 886 ext4_blkdev_remove(sbi);
ac27a0ec 887 }
c5e06d10
JL		 888 if (sbi->s_mmp_tsk)
889 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 890 sb->s_fs_info = NULL;
3197ebdb
TT		 891 /*
892 * Now that we are completely done shutting down the
893 * superblock, we need to actually destroy the kobject.
894 */
3197ebdb
TT		 895 unlock_super(sb);
896 kobject_put(&sbi->s_kobj);
897 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 898 kfree(sbi->s_blockgroup_lock);
ac27a0ec 899 kfree(sbi);
ac27a0ec
DK		 900}
901
e18b890b 902static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 903
904/*
905 * Called inside transaction, so use GFP_NOFS
906 */
617ba13b 907static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 908{
617ba13b 909 struct ext4_inode_info *ei;
ac27a0ec 910
e6b4f8da 911 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 912 if (!ei)
913 return NULL;
0b8e58a1 914
ac27a0ec 915 ei->vfs_inode.i_version = 1;
91246c00 916 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 917 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 918 INIT_LIST_HEAD(&ei->i_prealloc_list);
919 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 920 ei->i_reserved_data_blocks = 0;
921 ei->i_reserved_meta_blocks = 0;
922 ei->i_allocated_meta_blocks = 0;
9d0be502 923 ei->i_da_metadata_calc_len = 0;
d2a17637 924 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 925#ifdef CONFIG_QUOTA
926 ei->i_reserved_quota = 0;
927#endif
8aefcd55 928 ei->jinode = NULL;
c7064ef1 929 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 930 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 931 ei->cur_aio_dio = NULL;
b436b9be
JK		 932 ei->i_sync_tid = 0;
933 ei->i_datasync_tid = 0;
f7ad6d2e 934 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 935 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 936
ac27a0ec
DK		 937 return &ei->vfs_inode;
938}
939
7ff9c073
TT		 940static int ext4_drop_inode(struct inode *inode)
941{
942 int drop = generic_drop_inode(inode);
943
944 trace_ext4_drop_inode(inode, drop);
945 return drop;
946}
947
fa0d7e3d
NP		 948static void ext4_i_callback(struct rcu_head *head)
949{
950 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 951 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
952}
953
617ba13b 954static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 955{
9f7dd93d 956 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 957 ext4_msg(inode->i_sb, KERN_ERR,
958 "Inode %lu (%p): orphan list check failed!",
959 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 960 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
961 EXT4_I(inode), sizeof(struct ext4_inode_info),
962 true);
963 dump_stack();
964 }
fa0d7e3d 965 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 966}
967
51cc5068 968static void init_once(void *foo)
ac27a0ec 969{
617ba13b 970 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 971
a35afb83 972 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 973#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 974 init_rwsem(&ei->xattr_sem);
ac27a0ec 975#endif
0e855ac8 976 init_rwsem(&ei->i_data_sem);
a35afb83 977 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 978}
979
980static int init_inodecache(void)
981{
617ba13b
MC		 982 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
983 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 984 0, (SLAB_RECLAIM_ACCOUNT|
985 SLAB_MEM_SPREAD),
20c2df83 986 init_once);
617ba13b 987 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 988 return -ENOMEM;
989 return 0;
990}
991
992static void destroy_inodecache(void)
993{
617ba13b 994 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 995}
996
0930fcc1 997void ext4_clear_inode(struct inode *inode)
ac27a0ec 998{
0930fcc1
AV		 999 invalidate_inode_buffers(inode);
1000 end_writeback(inode);
9f754758 1001 dquot_drop(inode);
c2ea3fde 1002 ext4_discard_preallocations(inode);
8aefcd55
TT		 1003 if (EXT4_I(inode)->jinode) {
1004 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1005 EXT4_I(inode)->jinode);
1006 jbd2_free_inode(EXT4_I(inode)->jinode);
1007 EXT4_I(inode)->jinode = NULL;
1008 }
ac27a0ec
DK		 1009}
1010
1b961ac0 1011static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1012 u64 ino, u32 generation)
ac27a0ec 1013{
ac27a0ec 1014 struct inode *inode;
ac27a0ec 1015
617ba13b 1016 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1017 return ERR_PTR(-ESTALE);
617ba13b 1018 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1019 return ERR_PTR(-ESTALE);
1020
1021 /* iget isn't really right if the inode is currently unallocated!!
1022 *
617ba13b 1023 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1024 * deleted, so we should be safe.
1025 *
1026 * Currently we don't know the generation for parent directory, so
1027 * a generation of 0 means "accept any"
1028 */
1d1fe1ee
DH		 1029 inode = ext4_iget(sb, ino);
1030 if (IS_ERR(inode))
1031 return ERR_CAST(inode);
1032 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1033 iput(inode);
1034 return ERR_PTR(-ESTALE);
1035 }
1b961ac0
CH		 1036
1037 return inode;
1038}
1039
1040static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1041 int fh_len, int fh_type)
1b961ac0
CH		 1042{
1043 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1044 ext4_nfs_get_inode);
1045}
1046
1047static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1048 int fh_len, int fh_type)
1b961ac0
CH		 1049{
1050 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1051 ext4_nfs_get_inode);
ac27a0ec
DK		 1052}
1053
c39a7f84
TO		 1054/*
1055 * Try to release metadata pages (indirect blocks, directories) which are
1056 * mapped via the block device. Since these pages could have journal heads
1057 * which would prevent try_to_free_buffers() from freeing them, we must use
1058 * jbd2 layer's try_to_free_buffers() function to release them.
1059 */
0b8e58a1
AD		 1060static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1061 gfp_t wait)
c39a7f84
TO		 1062{
1063 journal_t *journal = EXT4_SB(sb)->s_journal;
1064
1065 WARN_ON(PageChecked(page));
1066 if (!page_has_buffers(page))
1067 return 0;
1068 if (journal)
1069 return jbd2_journal_try_to_free_buffers(journal, page,
1070 wait & ~__GFP_WAIT);
1071 return try_to_free_buffers(page);
1072}
1073
ac27a0ec 1074#ifdef CONFIG_QUOTA
af5bc92d 1075#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1076#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1077
617ba13b
MC		 1078static int ext4_write_dquot(struct dquot *dquot);
1079static int ext4_acquire_dquot(struct dquot *dquot);
1080static int ext4_release_dquot(struct dquot *dquot);
1081static int ext4_mark_dquot_dirty(struct dquot *dquot);
1082static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1083static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1084 struct path *path);
ca0e05e4 1085static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1086static int ext4_quota_on_mount(struct super_block *sb, int type);
1087static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1088 size_t len, loff_t off);
617ba13b 1089static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1090 const char *data, size_t len, loff_t off);
1091
61e225dc 1092static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1093 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1094 .write_dquot = ext4_write_dquot,
1095 .acquire_dquot = ext4_acquire_dquot,
1096 .release_dquot = ext4_release_dquot,
1097 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1098 .write_info = ext4_write_info,
1099 .alloc_dquot = dquot_alloc,
1100 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1101};
1102
0d54b217 1103static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1104 .quota_on = ext4_quota_on,
ca0e05e4 1105 .quota_off = ext4_quota_off,
287a8095
CH		 1106 .quota_sync = dquot_quota_sync,
1107 .get_info = dquot_get_dqinfo,
1108 .set_info = dquot_set_dqinfo,
1109 .get_dqblk = dquot_get_dqblk,
1110 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1111};
1112#endif
1113
ee9b6d61 1114static const struct super_operations ext4_sops = {
617ba13b
MC		 1115 .alloc_inode = ext4_alloc_inode,
1116 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1117 .write_inode = ext4_write_inode,
1118 .dirty_inode = ext4_dirty_inode,
7ff9c073 1119 .drop_inode = ext4_drop_inode,
0930fcc1 1120 .evict_inode = ext4_evict_inode,
617ba13b 1121 .put_super = ext4_put_super,
617ba13b 1122 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1123 .freeze_fs = ext4_freeze,
1124 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1125 .statfs = ext4_statfs,
1126 .remount_fs = ext4_remount,
617ba13b 1127 .show_options = ext4_show_options,
ac27a0ec 1128#ifdef CONFIG_QUOTA
617ba13b
MC		 1129 .quota_read = ext4_quota_read,
1130 .quota_write = ext4_quota_write,
ac27a0ec 1131#endif
c39a7f84 1132 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1133};
1134
9ca92389
TT		 1135static const struct super_operations ext4_nojournal_sops = {
1136 .alloc_inode = ext4_alloc_inode,
1137 .destroy_inode = ext4_destroy_inode,
1138 .write_inode = ext4_write_inode,
1139 .dirty_inode = ext4_dirty_inode,
7ff9c073 1140 .drop_inode = ext4_drop_inode,
0930fcc1 1141 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1142 .write_super = ext4_write_super,
1143 .put_super = ext4_put_super,
1144 .statfs = ext4_statfs,
1145 .remount_fs = ext4_remount,
9ca92389
TT		 1146 .show_options = ext4_show_options,
1147#ifdef CONFIG_QUOTA
1148 .quota_read = ext4_quota_read,
1149 .quota_write = ext4_quota_write,
1150#endif
1151 .bdev_try_to_free_page = bdev_try_to_free_page,
1152};
1153
39655164 1154static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1155 .fh_to_dentry = ext4_fh_to_dentry,
1156 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1157 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1158};
1159
1160enum {
1161 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1162 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1163 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1164 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1165 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1166 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1167 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1168 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1169 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1170 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1171 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1172 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1173 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1174 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1175 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1176 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1177 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1178 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1179};
1180
a447c093 1181static const match_table_t tokens = {
ac27a0ec
DK		 1182 {Opt_bsd_df, "bsddf"},
1183 {Opt_minix_df, "minixdf"},
1184 {Opt_grpid, "grpid"},
1185 {Opt_grpid, "bsdgroups"},
1186 {Opt_nogrpid, "nogrpid"},
1187 {Opt_nogrpid, "sysvgroups"},
1188 {Opt_resgid, "resgid=%u"},
1189 {Opt_resuid, "resuid=%u"},
1190 {Opt_sb, "sb=%u"},
1191 {Opt_err_cont, "errors=continue"},
1192 {Opt_err_panic, "errors=panic"},
1193 {Opt_err_ro, "errors=remount-ro"},
1194 {Opt_nouid32, "nouid32"},
ac27a0ec 1195 {Opt_debug, "debug"},
72578c33
TT		 1196 {Opt_removed, "oldalloc"},
1197 {Opt_removed, "orlov"},
ac27a0ec
DK		 1198 {Opt_user_xattr, "user_xattr"},
1199 {Opt_nouser_xattr, "nouser_xattr"},
1200 {Opt_acl, "acl"},
1201 {Opt_noacl, "noacl"},
e3bb52ae 1202 {Opt_noload, "norecovery"},
5a916be1 1203 {Opt_noload, "noload"},
72578c33
TT		 1204 {Opt_removed, "nobh"},
1205 {Opt_removed, "bh"},
ac27a0ec 1206 {Opt_commit, "commit=%u"},
30773840
TT		 1207 {Opt_min_batch_time, "min_batch_time=%u"},
1208 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1209 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1210 {Opt_journal_checksum, "journal_checksum"},
1211 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1212 {Opt_abort, "abort"},
1213 {Opt_data_journal, "data=journal"},
1214 {Opt_data_ordered, "data=ordered"},
1215 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1216 {Opt_data_err_abort, "data_err=abort"},
1217 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1218 {Opt_offusrjquota, "usrjquota="},
1219 {Opt_usrjquota, "usrjquota=%s"},
1220 {Opt_offgrpjquota, "grpjquota="},
1221 {Opt_grpjquota, "grpjquota=%s"},
1222 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1223 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1224 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1225 {Opt_grpquota, "grpquota"},
1226 {Opt_noquota, "noquota"},
1227 {Opt_quota, "quota"},
1228 {Opt_usrquota, "usrquota"},
1229 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1230 {Opt_barrier, "barrier"},
1231 {Opt_nobarrier, "nobarrier"},
25ec56b5 1232 {Opt_i_version, "i_version"},
c9de560d 1233 {Opt_stripe, "stripe=%u"},
64769240 1234 {Opt_delalloc, "delalloc"},
dd919b98 1235 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1236 {Opt_mblk_io_submit, "mblk_io_submit"},
1237 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1238 {Opt_block_validity, "block_validity"},
1239 {Opt_noblock_validity, "noblock_validity"},
240799cd 1240 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1241 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1242 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1243 {Opt_auto_da_alloc, "auto_da_alloc"},
1244 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1245 {Opt_dioread_nolock, "dioread_nolock"},
1246 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1247 {Opt_discard, "discard"},
1248 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1249 {Opt_init_itable, "init_itable=%u"},
1250 {Opt_init_itable, "init_itable"},
1251 {Opt_noinit_itable, "noinit_itable"},
f3f12faa 1252 {Opt_err, NULL},
ac27a0ec
DK		 1253};
1254
617ba13b 1255static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1256{
617ba13b 1257 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1258 char *options = (char *) *data;
1259
1260 if (!options || strncmp(options, "sb=", 3) != 0)
1261 return 1; /* Default location */
0b8e58a1 1262
ac27a0ec 1263 options += 3;
0b8e58a1 1264 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1265 sb_block = simple_strtoul(options, &options, 0);
1266 if (*options && *options != ',') {
4776004f 1267 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1268 (char *) *data);
1269 return 1;
1270 }
1271 if (*options == ',')
1272 options++;
1273 *data = (void *) options;
0b8e58a1 1274
ac27a0ec
DK		 1275 return sb_block;
1276}
1277
b3881f74 1278#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1279static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1280 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1281
56c50f11
DM		 1282#ifdef CONFIG_QUOTA
1283static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1284{
1285 struct ext4_sb_info *sbi = EXT4_SB(sb);
1286 char *qname;
1287
1288 if (sb_any_quota_loaded(sb) &&
1289 !sbi->s_qf_names[qtype]) {
1290 ext4_msg(sb, KERN_ERR,
1291 "Cannot change journaled "
1292 "quota options when quota turned on");
1293 return 0;
1294 }
1295 qname = match_strdup(args);
1296 if (!qname) {
1297 ext4_msg(sb, KERN_ERR,
1298 "Not enough memory for storing quotafile name");
1299 return 0;
1300 }
1301 if (sbi->s_qf_names[qtype] &&
1302 strcmp(sbi->s_qf_names[qtype], qname)) {
1303 ext4_msg(sb, KERN_ERR,
1304 "%s quota file already specified", QTYPE2NAME(qtype));
1305 kfree(qname);
1306 return 0;
1307 }
1308 sbi->s_qf_names[qtype] = qname;
1309 if (strchr(sbi->s_qf_names[qtype], '/')) {
1310 ext4_msg(sb, KERN_ERR,
1311 "quotafile must be on filesystem root");
1312 kfree(sbi->s_qf_names[qtype]);
1313 sbi->s_qf_names[qtype] = NULL;
1314 return 0;
1315 }
fd8c37ec 1316 set_opt(sb, QUOTA);
56c50f11
DM		 1317 return 1;
1318}
1319
1320static int clear_qf_name(struct super_block *sb, int qtype)
1321{
1322
1323 struct ext4_sb_info *sbi = EXT4_SB(sb);
1324
1325 if (sb_any_quota_loaded(sb) &&
1326 sbi->s_qf_names[qtype]) {
1327 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1328 " when quota turned on");
1329 return 0;
1330 }
1331 /*
1332 * The space will be released later when all options are confirmed
1333 * to be correct
1334 */
1335 sbi->s_qf_names[qtype] = NULL;
1336 return 1;
1337}
1338#endif
1339
26092bf5
TT		 1340#define MOPT_SET 0x0001
1341#define MOPT_CLEAR 0x0002
1342#define MOPT_NOSUPPORT 0x0004
1343#define MOPT_EXPLICIT 0x0008
1344#define MOPT_CLEAR_ERR 0x0010
1345#define MOPT_GTE0 0x0020
ac27a0ec 1346#ifdef CONFIG_QUOTA
26092bf5
TT		 1347#define MOPT_Q 0
1348#define MOPT_QFMT 0x0040
1349#else
1350#define MOPT_Q MOPT_NOSUPPORT
1351#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1352#endif
26092bf5
TT		 1353#define MOPT_DATAJ 0x0080
1354
1355static const struct mount_opts {
1356 int token;
1357 int mount_opt;
1358 int flags;
1359} ext4_mount_opts[] = {
1360 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1361 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1362 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1363 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1364 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1365 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1366 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1367 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1368 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1369 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1370 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1371 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1372 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1373 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1374 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1375 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1376 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1377 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1378 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1379 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1380 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1381 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1382 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1383 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1384 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1385 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1386 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1387 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1388 {Opt_commit, 0, MOPT_GTE0},
1389 {Opt_max_batch_time, 0, MOPT_GTE0},
1390 {Opt_min_batch_time, 0, MOPT_GTE0},
1391 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1392 {Opt_init_itable, 0, MOPT_GTE0},
1393 {Opt_stripe, 0, MOPT_GTE0},
1394 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1395 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1396 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1397#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1398 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1399 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1400#else
26092bf5
TT		 1401 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1402 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1403#endif
03010a33 1404#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1405 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1406 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1407#else
26092bf5
TT		 1408 {Opt_acl, 0, MOPT_NOSUPPORT},
1409 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1410#endif
26092bf5
TT		 1411 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1412 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1413 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1414 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1415 MOPT_SET | MOPT_Q},
1416 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1417 MOPT_SET | MOPT_Q},
1418 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1419 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1420 {Opt_usrjquota, 0, MOPT_Q},
1421 {Opt_grpjquota, 0, MOPT_Q},
1422 {Opt_offusrjquota, 0, MOPT_Q},
1423 {Opt_offgrpjquota, 0, MOPT_Q},
1424 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1425 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1426 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1427 {Opt_err, 0, 0}
1428};
1429
1430static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1431 substring_t *args, unsigned long *journal_devnum,
1432 unsigned int *journal_ioprio, int is_remount)
1433{
1434 struct ext4_sb_info *sbi = EXT4_SB(sb);
1435 const struct mount_opts *m;
1436 int arg = 0;
1437
1438 if (args->from && match_int(args, &arg))
1439 return -1;
1440 switch (token) {
1441 case Opt_sb:
1442 return 1; /* handled by get_sb_block() */
1443 case Opt_removed:
1444 ext4_msg(sb, KERN_WARNING,
1445 "Ignoring removed %s option", opt);
1446 return 1;
1447 case Opt_resuid:
1448 sbi->s_resuid = arg;
1449 return 1;
1450 case Opt_resgid:
1451 sbi->s_resgid = arg;
1452 return 1;
1453 case Opt_abort:
1454 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1455 return 1;
1456 case Opt_i_version:
1457 sb->s_flags |= MS_I_VERSION;
1458 return 1;
1459 case Opt_journal_dev:
1460 if (is_remount) {
1461 ext4_msg(sb, KERN_ERR,
1462 "Cannot specify journal on remount");
1463 return -1;
1464 }
1465 *journal_devnum = arg;
1466 return 1;
1467 case Opt_journal_ioprio:
1468 if (arg < 0 || arg > 7)
1469 return -1;
1470 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1471 return 1;
1472 }
1473
1474 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1475 if (token != m->token)
1476 continue;
1477 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1478 return -1;
1479 if (m->flags & MOPT_EXPLICIT)
1480 set_opt2(sb, EXPLICIT_DELALLOC);
1481 if (m->flags & MOPT_CLEAR_ERR)
1482 clear_opt(sb, ERRORS_MASK);
1483 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1484 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1485 "options when quota turned on");
1486 return -1;
1487 }
1488
1489 if (m->flags & MOPT_NOSUPPORT) {
1490 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1491 } else if (token == Opt_commit) {
1492 if (arg == 0)
1493 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1494 sbi->s_commit_interval = HZ * arg;
1495 } else if (token == Opt_max_batch_time) {
1496 if (arg == 0)
1497 arg = EXT4_DEF_MAX_BATCH_TIME;
1498 sbi->s_max_batch_time = arg;
1499 } else if (token == Opt_min_batch_time) {
1500 sbi->s_min_batch_time = arg;
1501 } else if (token == Opt_inode_readahead_blks) {
1502 if (arg > (1 << 30))
1503 return -1;
1504 if (arg && !is_power_of_2(arg)) {
b31e1552 1505 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1506 "EXT4-fs: inode_readahead_blks"
1507 " must be a power of 2");
1508 return -1;
ac27a0ec 1509 }
26092bf5
TT		 1510 sbi->s_inode_readahead_blks = arg;
1511 } else if (token == Opt_init_itable) {
1512 set_opt(sb, INIT_INODE_TABLE);
1513 if (!args->from)
1514 arg = EXT4_DEF_LI_WAIT_MULT;
1515 sbi->s_li_wait_mult = arg;
1516 } else if (token == Opt_stripe) {
1517 sbi->s_stripe = arg;
1518 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1519 if (is_remount) {
eb513689
TT		 1520 if (!sbi->s_journal)
1521 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1522 else if (test_opt(sb, DATA_FLAGS) !=
1523 m->mount_opt) {
b31e1552 1524 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1525 "Cannot change data mode on remount");
1526 return -1;
ac27a0ec
DK		 1527 }
1528 } else {
fd8c37ec 1529 clear_opt(sb, DATA_FLAGS);
26092bf5 1530 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1531 }
ac27a0ec 1532#ifdef CONFIG_QUOTA
26092bf5 1533 } else if (token == Opt_usrjquota) {
56c50f11 1534 if (!set_qf_name(sb, USRQUOTA, &args[0]))
26092bf5
TT		 1535 return -1;
1536 } else if (token == Opt_grpjquota) {
56c50f11 1537 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
26092bf5
TT		 1538 return -1;
1539 } else if (token == Opt_offusrjquota) {
56c50f11 1540 if (!clear_qf_name(sb, USRQUOTA))
26092bf5
TT		 1541 return -1;
1542 } else if (token == Opt_offgrpjquota) {
56c50f11 1543 if (!clear_qf_name(sb, GRPQUOTA))
26092bf5
TT		 1544 return -1;
1545 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1546 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1547 sbi->s_jquota_fmt != m->mount_opt) {
1548 ext4_msg(sb, KERN_ERR, "Cannot "
1549 "change journaled quota options "
1550 "when quota turned on");
1551 return -1;
dfc5d03f 1552 }
26092bf5 1553 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1554#endif
26092bf5
TT		 1555 } else {
1556 if (!args->from)
1557 arg = 1;
1558 if (m->flags & MOPT_CLEAR)
1559 arg = !arg;
1560 else if (unlikely(!(m->flags & MOPT_SET))) {
1561 ext4_msg(sb, KERN_WARNING,
1562 "buggy handling of option %s", opt);
1563 WARN_ON(1);
1564 return -1;
3197ebdb 1565 }
26092bf5
TT		 1566 if (arg != 0)
1567 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1568 else
26092bf5 1569 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1570 }
26092bf5
TT		 1571 return 1;
1572 }
1573 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1574 "or missing value", opt);
1575 return -1;
1576}
1577
1578static int parse_options(char *options, struct super_block *sb,
1579 unsigned long *journal_devnum,
1580 unsigned int *journal_ioprio,
1581 int is_remount)
1582{
1583 struct ext4_sb_info *sbi = EXT4_SB(sb);
1584 char *p;
1585 substring_t args[MAX_OPT_ARGS];
1586 int token;
1587
1588 if (!options)
1589 return 1;
1590
1591 while ((p = strsep(&options, ",")) != NULL) {
1592 if (!*p)
1593 continue;
1594 /*
1595 * Initialize args struct so we know whether arg was
1596 * found; some options take optional arguments.
1597 */
1598 args[0].to = args[0].from = 0;
1599 token = match_token(p, tokens, args);
1600 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1601 journal_ioprio, is_remount) < 0)
1602 return 0;
ac27a0ec
DK		 1603 }
1604#ifdef CONFIG_QUOTA
1605 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1606 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1607 clear_opt(sb, USRQUOTA);
ac27a0ec 1608
482a7425 1609 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1610 clear_opt(sb, GRPQUOTA);
ac27a0ec 1611
56c50f11 1612 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1613 ext4_msg(sb, KERN_ERR, "old and new quota "
1614 "format mixing");
ac27a0ec
DK		 1615 return 0;
1616 }
1617
1618 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1619 ext4_msg(sb, KERN_ERR, "journaled quota format "
1620 "not specified");
ac27a0ec
DK		 1621 return 0;
1622 }
1623 } else {
1624 if (sbi->s_jquota_fmt) {
b31e1552 1625 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1626 "specified with no journaling "
b31e1552 1627 "enabled");
ac27a0ec
DK		 1628 return 0;
1629 }
1630 }
1631#endif
1632 return 1;
1633}
1634
2adf6da8
TT		 1635static inline void ext4_show_quota_options(struct seq_file *seq,
1636 struct super_block *sb)
1637{
1638#if defined(CONFIG_QUOTA)
1639 struct ext4_sb_info *sbi = EXT4_SB(sb);
1640
1641 if (sbi->s_jquota_fmt) {
1642 char *fmtname = "";
1643
1644 switch (sbi->s_jquota_fmt) {
1645 case QFMT_VFS_OLD:
1646 fmtname = "vfsold";
1647 break;
1648 case QFMT_VFS_V0:
1649 fmtname = "vfsv0";
1650 break;
1651 case QFMT_VFS_V1:
1652 fmtname = "vfsv1";
1653 break;
1654 }
1655 seq_printf(seq, ",jqfmt=%s", fmtname);
1656 }
1657
1658 if (sbi->s_qf_names[USRQUOTA])
1659 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1660
1661 if (sbi->s_qf_names[GRPQUOTA])
1662 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1663
1664 if (test_opt(sb, USRQUOTA))
1665 seq_puts(seq, ",usrquota");
1666
1667 if (test_opt(sb, GRPQUOTA))
1668 seq_puts(seq, ",grpquota");
1669#endif
1670}
1671
5a916be1
TT		 1672static const char *token2str(int token)
1673{
1674 static const struct match_token *t;
1675
1676 for (t = tokens; t->token != Opt_err; t++)
1677 if (t->token == token && !strchr(t->pattern, '='))
1678 break;
1679 return t->pattern;
1680}
1681
2adf6da8
TT		 1682/*
1683 * Show an option if
1684 * - it's set to a non-default value OR
1685 * - if the per-sb default is different from the global default
1686 */
66acdcf4
TT		 1687static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1688 int nodefs)
2adf6da8 1689{
2adf6da8
TT		 1690 struct ext4_sb_info *sbi = EXT4_SB(sb);
1691 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1692 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1693 const struct mount_opts *m;
66acdcf4 1694 char sep = nodefs ? '\n' : ',';
2adf6da8 1695
66acdcf4
TT		 1696#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1697#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1698
1699 if (sbi->s_sb_block != 1)
5a916be1
TT		 1700 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1701
1702 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1703 int want_set = m->flags & MOPT_SET;
1704 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1705 (m->flags & MOPT_CLEAR_ERR))
1706 continue;
66acdcf4 1707 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1708 continue; /* skip if same as the default */
1709 if ((want_set &&
1710 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1711 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1712 continue; /* select Opt_noFoo vs Opt_Foo */
1713 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1714 }
5a916be1 1715
66acdcf4 1716 if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
5a916be1
TT		 1717 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1718 SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
66acdcf4 1719 if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
5a916be1
TT		 1720 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1721 SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
66acdcf4 1722 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1723 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1724 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1725 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1726 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1727 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1728 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1729 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1730 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1731 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1732 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1733 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1734 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1735 if (sb->s_flags & MS_I_VERSION)
5a916be1 1736 SEQ_OPTS_PUTS("i_version");
66acdcf4 1737 if (nodefs || sbi->s_stripe)
5a916be1 1738 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1739 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1740 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1741 SEQ_OPTS_PUTS("data=journal");
1742 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1743 SEQ_OPTS_PUTS("data=ordered");
1744 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1745 SEQ_OPTS_PUTS("data=writeback");
1746 }
66acdcf4
TT		 1747 if (nodefs ||
1748 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1749 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1750 sbi->s_inode_readahead_blks);
2adf6da8 1751
66acdcf4
TT		 1752 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1753 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1754 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2adf6da8
TT		 1755
1756 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1757 return 0;
1758}
1759
66acdcf4
TT		 1760static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1761{
1762 return _ext4_show_options(seq, root->d_sb, 0);
1763}
1764
1765static int options_seq_show(struct seq_file *seq, void *offset)
1766{
1767 struct super_block *sb = seq->private;
1768 int rc;
1769
1770 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1771 rc = _ext4_show_options(seq, sb, 1);
1772 seq_puts(seq, "\n");
1773 return rc;
1774}
1775
1776static int options_open_fs(struct inode *inode, struct file *file)
1777{
1778 return single_open(file, options_seq_show, PDE(inode)->data);
1779}
1780
1781static const struct file_operations ext4_seq_options_fops = {
1782 .owner = THIS_MODULE,
1783 .open = options_open_fs,
1784 .read = seq_read,
1785 .llseek = seq_lseek,
1786 .release = single_release,
1787};
1788
617ba13b 1789static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1790 int read_only)
1791{
617ba13b 1792 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1793 int res = 0;
1794
617ba13b 1795 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1796 ext4_msg(sb, KERN_ERR, "revision level too high, "
1797 "forcing read-only mode");
ac27a0ec
DK		 1798 res = MS_RDONLY;
1799 }
1800 if (read_only)
281b5995 1801 goto done;
617ba13b 1802 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1803 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1804 "running e2fsck is recommended");
617ba13b 1805 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1806 ext4_msg(sb, KERN_WARNING,
1807 "warning: mounting fs with errors, "
1808 "running e2fsck is recommended");
ed3ce80a 1809 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1810 le16_to_cpu(es->s_mnt_count) >=
1811 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1812 ext4_msg(sb, KERN_WARNING,
1813 "warning: maximal mount count reached, "
1814 "running e2fsck is recommended");
ac27a0ec
DK		 1815 else if (le32_to_cpu(es->s_checkinterval) &&
1816 (le32_to_cpu(es->s_lastcheck) +
1817 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1818 ext4_msg(sb, KERN_WARNING,
1819 "warning: checktime reached, "
1820 "running e2fsck is recommended");
0b8e58a1 1821 if (!sbi->s_journal)
0390131b 1822 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1823 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1824 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1825 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1826 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1827 ext4_update_dynamic_rev(sb);
0390131b
FM		 1828 if (sbi->s_journal)
1829 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1830
e2d67052 1831 ext4_commit_super(sb, 1);
281b5995 1832done:
ac27a0ec 1833 if (test_opt(sb, DEBUG))
a9df9a49 1834 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1835 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1836 sb->s_blocksize,
1837 sbi->s_groups_count,
617ba13b
MC		 1838 EXT4_BLOCKS_PER_GROUP(sb),
1839 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1840 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1841
7abc52c2 1842 cleancache_init_fs(sb);
ac27a0ec
DK		 1843 return res;
1844}
1845
772cb7c8
JS		 1846static int ext4_fill_flex_info(struct super_block *sb)
1847{
1848 struct ext4_sb_info *sbi = EXT4_SB(sb);
1849 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1850 ext4_group_t flex_group_count;
1851 ext4_group_t flex_group;
d50f2ab6 1852 unsigned int groups_per_flex = 0;
c5ca7c76 1853 size_t size;
772cb7c8
JS		 1854 int i;
1855
503358ae 1856 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1857 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1858 sbi->s_log_groups_per_flex = 0;
1859 return 1;
1860 }
d50f2ab6 1861 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1862
c62a11fd
FB		 1863 /* We allocate both existing and potentially added groups */
1864 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1865 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1866 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1867 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1868 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1869 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1870 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1871 flex_group_count);
1872 goto failed;
772cb7c8 1873 }
772cb7c8 1874
772cb7c8 1875 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1876 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1877
1878 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1879 atomic_add(ext4_free_inodes_count(sb, gdp),
1880 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1881 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1882 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1883 atomic_add(ext4_used_dirs_count(sb, gdp),
1884 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1885 }
1886
1887 return 1;
1888failed:
1889 return 0;
1890}
1891
717d50e4
AD		 1892__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1893 struct ext4_group_desc *gdp)
1894{
1895 __u16 crc = 0;
1896
1897 if (sbi->s_es->s_feature_ro_compat &
1898 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1899 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1900 __le32 le_group = cpu_to_le32(block_group);
1901
1902 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1903 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1904 crc = crc16(crc, (__u8 *)gdp, offset);
1905 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1906 /* for checksum of struct ext4_group_desc do the rest...*/
1907 if ((sbi->s_es->s_feature_incompat &
1908 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1909 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1910 crc = crc16(crc, (__u8 *)gdp + offset,
1911 le16_to_cpu(sbi->s_es->s_desc_size) -
1912 offset);
1913 }
1914
1915 return cpu_to_le16(crc);
1916}
1917
1918int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1919 struct ext4_group_desc *gdp)
1920{
1921 if ((sbi->s_es->s_feature_ro_compat &
1922 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1923 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1924 return 0;
1925
1926 return 1;
1927}
1928
ac27a0ec 1929/* Called at mount-time, super-block is locked */
bfff6873
LC		 1930static int ext4_check_descriptors(struct super_block *sb,
1931 ext4_group_t *first_not_zeroed)
ac27a0ec 1932{
617ba13b
MC		 1933 struct ext4_sb_info *sbi = EXT4_SB(sb);
1934 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1935 ext4_fsblk_t last_block;
bd81d8ee
LV		 1936 ext4_fsblk_t block_bitmap;
1937 ext4_fsblk_t inode_bitmap;
1938 ext4_fsblk_t inode_table;
ce421581 1939 int flexbg_flag = 0;
bfff6873 1940 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 1941
ce421581
JS		 1942 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1943 flexbg_flag = 1;
1944
af5bc92d 1945 ext4_debug("Checking group descriptors");
ac27a0ec 1946
197cd65a
AM		 1947 for (i = 0; i < sbi->s_groups_count; i++) {
1948 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1949
ce421581 1950 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1951 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1952 else
1953 last_block = first_block +
617ba13b 1954 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1955
bfff6873
LC		 1956 if ((grp == sbi->s_groups_count) &&
1957 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
1958 grp = i;
1959
8fadc143 1960 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1961 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1962 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1963 "Block bitmap for group %u not in group "
b31e1552 1964 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1965 return 0;
1966 }
8fadc143 1967 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1968 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1969 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1970 "Inode bitmap for group %u not in group "
b31e1552 1971 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1972 return 0;
1973 }
8fadc143 1974 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1975 if (inode_table < first_block ||
2b2d6d01 1976 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1977 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1978 "Inode table for group %u not in group "
b31e1552 1979 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1980 return 0;
1981 }
955ce5f5 1982 ext4_lock_group(sb, i);
717d50e4 1983 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1984 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1985 "Checksum for group %u failed (%u!=%u)",
1986 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1987 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1988 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1989 ext4_unlock_group(sb, i);
8a266467 1990 return 0;
7ee1ec4c 1991 }
717d50e4 1992 }
955ce5f5 1993 ext4_unlock_group(sb, i);
ce421581
JS		 1994 if (!flexbg_flag)
1995 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 1996 }
bfff6873
LC		 1997 if (NULL != first_not_zeroed)
1998 *first_not_zeroed = grp;
ac27a0ec 1999
5dee5437
TT		 2000 ext4_free_blocks_count_set(sbi->s_es,
2001 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2002 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2003 return 1;
2004}
2005
617ba13b 2006/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2007 * the superblock) which were deleted from all directories, but held open by
2008 * a process at the time of a crash. We walk the list and try to delete these
2009 * inodes at recovery time (only with a read-write filesystem).
2010 *
2011 * In order to keep the orphan inode chain consistent during traversal (in
2012 * case of crash during recovery), we link each inode into the superblock
2013 * orphan list_head and handle it the same way as an inode deletion during
2014 * normal operation (which journals the operations for us).
2015 *
2016 * We only do an iget() and an iput() on each inode, which is very safe if we
2017 * accidentally point at an in-use or already deleted inode. The worst that
2018 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2019 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2020 * e2fsck was run on this filesystem, and it must have already done the orphan
2021 * inode cleanup for us, so we can safely abort without any further action.
2022 */
2b2d6d01
TT		 2023static void ext4_orphan_cleanup(struct super_block *sb,
2024 struct ext4_super_block *es)
ac27a0ec
DK		 2025{
2026 unsigned int s_flags = sb->s_flags;
2027 int nr_orphans = 0, nr_truncates = 0;
2028#ifdef CONFIG_QUOTA
2029 int i;
2030#endif
2031 if (!es->s_last_orphan) {
2032 jbd_debug(4, "no orphan inodes to clean up\n");
2033 return;
2034 }
2035
a8f48a95 2036 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2037 ext4_msg(sb, KERN_ERR, "write access "
2038 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2039 return;
2040 }
2041
d39195c3
AG		 2042 /* Check if feature set would not allow a r/w mount */
2043 if (!ext4_feature_set_ok(sb, 0)) {
2044 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2045 "unknown ROCOMPAT features");
2046 return;
2047 }
2048
617ba13b 2049 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2050 if (es->s_last_orphan)
2051 jbd_debug(1, "Errors on filesystem, "
2052 "clearing orphan list.\n");
2053 es->s_last_orphan = 0;
2054 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2055 return;
2056 }
2057
2058 if (s_flags & MS_RDONLY) {
b31e1552 2059 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2060 sb->s_flags &= ~MS_RDONLY;
2061 }
2062#ifdef CONFIG_QUOTA
2063 /* Needed for iput() to work correctly and not trash data */
2064 sb->s_flags |= MS_ACTIVE;
2065 /* Turn on quotas so that they are updated correctly */
2066 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2067 if (EXT4_SB(sb)->s_qf_names[i]) {
2068 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2069 if (ret < 0)
b31e1552
ES		 2070 ext4_msg(sb, KERN_ERR,
2071 "Cannot turn on journaled "
2072 "quota: error %d", ret);
ac27a0ec
DK		 2073 }
2074 }
2075#endif
2076
2077 while (es->s_last_orphan) {
2078 struct inode *inode;
2079
97bd42b9
JB		 2080 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2081 if (IS_ERR(inode)) {
ac27a0ec
DK		 2082 es->s_last_orphan = 0;
2083 break;
2084 }
2085
617ba13b 2086 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2087 dquot_initialize(inode);
ac27a0ec 2088 if (inode->i_nlink) {
b31e1552
ES		 2089 ext4_msg(sb, KERN_DEBUG,
2090 "%s: truncating inode %lu to %lld bytes",
46e665e9 2091 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2092 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2093 inode->i_ino, inode->i_size);
617ba13b 2094 ext4_truncate(inode);
ac27a0ec
DK		 2095 nr_truncates++;
2096 } else {
b31e1552
ES		 2097 ext4_msg(sb, KERN_DEBUG,
2098 "%s: deleting unreferenced inode %lu",
46e665e9 2099 __func__, inode->i_ino);
ac27a0ec
DK		 2100 jbd_debug(2, "deleting unreferenced inode %lu\n",
2101 inode->i_ino);
2102 nr_orphans++;
2103 }
2104 iput(inode); /* The delete magic happens here! */
2105 }
2106
2b2d6d01 2107#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2108
2109 if (nr_orphans)
b31e1552
ES		 2110 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2111 PLURAL(nr_orphans));
ac27a0ec 2112 if (nr_truncates)
b31e1552
ES		 2113 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2114 PLURAL(nr_truncates));
ac27a0ec
DK		 2115#ifdef CONFIG_QUOTA
2116 /* Turn quotas off */
2117 for (i = 0; i < MAXQUOTAS; i++) {
2118 if (sb_dqopt(sb)->files[i])
287a8095 2119 dquot_quota_off(sb, i);
ac27a0ec
DK		 2120 }
2121#endif
2122 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2123}
0b8e58a1 2124
cd2291a4
ES		 2125/*
2126 * Maximal extent format file size.
2127 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2128 * extent format containers, within a sector_t, and within i_blocks
2129 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2130 * so that won't be a limiting factor.
2131 *
f17722f9
LC		 2132 * However there is other limiting factor. We do store extents in the form
2133 * of starting block and length, hence the resulting length of the extent
2134 * covering maximum file size must fit into on-disk format containers as
2135 * well. Given that length is always by 1 unit bigger than max unit (because
2136 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2137 *
cd2291a4
ES		 2138 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2139 */
f287a1a5 2140static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2141{
2142 loff_t res;
2143 loff_t upper_limit = MAX_LFS_FILESIZE;
2144
2145 /* small i_blocks in vfs inode? */
f287a1a5 2146 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2147 /*
90c699a9 2148 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2149 * i_block represent total blocks in 512 bytes
2150 * 32 == size of vfs inode i_blocks * 8
2151 */
2152 upper_limit = (1LL << 32) - 1;
2153
2154 /* total blocks in file system block size */
2155 upper_limit >>= (blkbits - 9);
2156 upper_limit <<= blkbits;
2157 }
2158
f17722f9
LC		 2159 /*
2160 * 32-bit extent-start container, ee_block. We lower the maxbytes
2161 * by one fs block, so ee_len can cover the extent of maximum file
2162 * size
2163 */
2164 res = (1LL << 32) - 1;
cd2291a4 2165 res <<= blkbits;
cd2291a4
ES		 2166
2167 /* Sanity check against vm- & vfs- imposed limits */
2168 if (res > upper_limit)
2169 res = upper_limit;
2170
2171 return res;
2172}
ac27a0ec 2173
ac27a0ec 2174/*
cd2291a4 2175 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2176 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2177 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2178 */
f287a1a5 2179static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2180{
617ba13b 2181 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2182 int meta_blocks;
2183 loff_t upper_limit;
0b8e58a1
AD		 2184 /* This is calculated to be the largest file size for a dense, block
2185 * mapped file such that the file's total number of 512-byte sectors,
2186 * including data and all indirect blocks, does not exceed (2^48 - 1).
2187 *
2188 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2189 * number of 512-byte sectors of the file.
0fc1b451
AK		 2190 */
2191
f287a1a5 2192 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2193 /*
90c699a9 2194 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2195 * the inode i_block field represents total file blocks in
2196 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2197 */
2198 upper_limit = (1LL << 32) - 1;
2199
2200 /* total blocks in file system block size */
2201 upper_limit >>= (bits - 9);
2202
2203 } else {
8180a562
AK		 2204 /*
2205 * We use 48 bit ext4_inode i_blocks
2206 * With EXT4_HUGE_FILE_FL set the i_blocks
2207 * represent total number of blocks in
2208 * file system block size
2209 */
0fc1b451
AK		 2210 upper_limit = (1LL << 48) - 1;
2211
0fc1b451
AK		 2212 }
2213
2214 /* indirect blocks */
2215 meta_blocks = 1;
2216 /* double indirect blocks */
2217 meta_blocks += 1 + (1LL << (bits-2));
2218 /* tripple indirect blocks */
2219 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2220
2221 upper_limit -= meta_blocks;
2222 upper_limit <<= bits;
ac27a0ec
DK		 2223
2224 res += 1LL << (bits-2);
2225 res += 1LL << (2*(bits-2));
2226 res += 1LL << (3*(bits-2));
2227 res <<= bits;
2228 if (res > upper_limit)
2229 res = upper_limit;
0fc1b451
AK		 2230
2231 if (res > MAX_LFS_FILESIZE)
2232 res = MAX_LFS_FILESIZE;
2233
ac27a0ec
DK		 2234 return res;
2235}
2236
617ba13b 2237static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2238 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2239{
617ba13b 2240 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2241 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2242 int has_super = 0;
2243
2244 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2245
617ba13b 2246 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2247 nr < first_meta_bg)
70bbb3e0 2248 return logical_sb_block + nr + 1;
ac27a0ec 2249 bg = sbi->s_desc_per_block * nr;
617ba13b 2250 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2251 has_super = 1;
0b8e58a1 2252
617ba13b 2253 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2254}
2255
c9de560d
AT		 2256/**
2257 * ext4_get_stripe_size: Get the stripe size.
2258 * @sbi: In memory super block info
2259 *
2260 * If we have specified it via mount option, then
2261 * use the mount option value. If the value specified at mount time is
2262 * greater than the blocks per group use the super block value.
2263 * If the super block value is greater than blocks per group return 0.
2264 * Allocator needs it be less than blocks per group.
2265 *
2266 */
2267static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2268{
2269 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2270 unsigned long stripe_width =
2271 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2272 int ret;
c9de560d
AT		 2273
2274 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2275 ret = sbi->s_stripe;
2276 else if (stripe_width <= sbi->s_blocks_per_group)
2277 ret = stripe_width;
2278 else if (stride <= sbi->s_blocks_per_group)
2279 ret = stride;
2280 else
2281 ret = 0;
c9de560d 2282
3eb08658
DE		 2283 /*
2284 * If the stripe width is 1, this makes no sense and
2285 * we set it to 0 to turn off stripe handling code.
2286 */
2287 if (ret <= 1)
2288 ret = 0;
c9de560d 2289
3eb08658 2290 return ret;
c9de560d 2291}
ac27a0ec 2292
3197ebdb
TT		 2293/* sysfs supprt */
2294
2295struct ext4_attr {
2296 struct attribute attr;
2297 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2298 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2299 const char *, size_t);
2300 int offset;
2301};
2302
2303static int parse_strtoul(const char *buf,
2304 unsigned long max, unsigned long *value)
2305{
2306 char *endp;
2307
e7d2860b
AGR		 2308 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2309 endp = skip_spaces(endp);
3197ebdb
TT		 2310 if (*endp || *value > max)
2311 return -EINVAL;
2312
2313 return 0;
2314}
2315
2316static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2317 struct ext4_sb_info *sbi,
2318 char *buf)
2319{
2320 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2321 (s64) EXT4_C2B(sbi,
2322 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2323}
2324
2325static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2326 struct ext4_sb_info *sbi, char *buf)
2327{
2328 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2329
f613dfcb
TT		 2330 if (!sb->s_bdev->bd_part)
2331 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2332 return snprintf(buf, PAGE_SIZE, "%lu\n",
2333 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2334 sbi->s_sectors_written_start) >> 1);
2335}
2336
2337static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2338 struct ext4_sb_info *sbi, char *buf)
2339{
2340 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2341
f613dfcb
TT		 2342 if (!sb->s_bdev->bd_part)
2343 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2344 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2345 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2346 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2347 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2348}
2349
77f4135f
VH		 2350static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2351 struct ext4_sb_info *sbi, char *buf)
2352{
2353 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2354}
2355
2356static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2357 struct ext4_sb_info *sbi, char *buf)
2358{
2359 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2360}
2361
3197ebdb
TT		 2362static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2363 struct ext4_sb_info *sbi,
2364 const char *buf, size_t count)
2365{
2366 unsigned long t;
2367
2368 if (parse_strtoul(buf, 0x40000000, &t))
2369 return -EINVAL;
2370
5dbd571d 2371 if (t && !is_power_of_2(t))
3197ebdb
TT		 2372 return -EINVAL;
2373
2374 sbi->s_inode_readahead_blks = t;
2375 return count;
2376}
2377
2378static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2379 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2380{
2381 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2382
2383 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2384}
2385
2386static ssize_t sbi_ui_store(struct ext4_attr *a,
2387 struct ext4_sb_info *sbi,
2388 const char *buf, size_t count)
2389{
2390 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2391 unsigned long t;
2392
2393 if (parse_strtoul(buf, 0xffffffff, &t))
2394 return -EINVAL;
2395 *ui = t;
2396 return count;
2397}
2398
2399#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2400static struct ext4_attr ext4_attr_##_name = { \
2401 .attr = {.name = __stringify(_name), .mode = _mode }, \
2402 .show = _show, \
2403 .store = _store, \
2404 .offset = offsetof(struct ext4_sb_info, _elname), \
2405}
2406#define EXT4_ATTR(name, mode, show, store) \
2407static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2408
857ac889 2409#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2410#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2411#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2412#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2413 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2414#define ATTR_LIST(name) &ext4_attr_##name.attr
2415
2416EXT4_RO_ATTR(delayed_allocation_blocks);
2417EXT4_RO_ATTR(session_write_kbytes);
2418EXT4_RO_ATTR(lifetime_write_kbytes);
77f4135f
VH		 2419EXT4_RO_ATTR(extent_cache_hits);
2420EXT4_RO_ATTR(extent_cache_misses);
3197ebdb
TT		 2421EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2422 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2423EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2424EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2425EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2426EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2427EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2428EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2429EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2430EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2431
2432static struct attribute *ext4_attrs[] = {
2433 ATTR_LIST(delayed_allocation_blocks),
2434 ATTR_LIST(session_write_kbytes),
2435 ATTR_LIST(lifetime_write_kbytes),
77f4135f
VH		 2436 ATTR_LIST(extent_cache_hits),
2437 ATTR_LIST(extent_cache_misses),
3197ebdb 2438 ATTR_LIST(inode_readahead_blks),
11013911 2439 ATTR_LIST(inode_goal),
3197ebdb
TT		 2440 ATTR_LIST(mb_stats),
2441 ATTR_LIST(mb_max_to_scan),
2442 ATTR_LIST(mb_min_to_scan),
2443 ATTR_LIST(mb_order2_req),
2444 ATTR_LIST(mb_stream_req),
2445 ATTR_LIST(mb_group_prealloc),
55138e0b 2446 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2447 NULL,
2448};
2449
857ac889
LC		 2450/* Features this copy of ext4 supports */
2451EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2452EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2453
2454static struct attribute *ext4_feat_attrs[] = {
2455 ATTR_LIST(lazy_itable_init),
27ee40df 2456 ATTR_LIST(batched_discard),
857ac889
LC		 2457 NULL,
2458};
2459
3197ebdb
TT		 2460static ssize_t ext4_attr_show(struct kobject *kobj,
2461 struct attribute *attr, char *buf)
2462{
2463 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2464 s_kobj);
2465 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2466
2467 return a->show ? a->show(a, sbi, buf) : 0;
2468}
2469
2470static ssize_t ext4_attr_store(struct kobject *kobj,
2471 struct attribute *attr,
2472 const char *buf, size_t len)
2473{
2474 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2475 s_kobj);
2476 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2477
2478 return a->store ? a->store(a, sbi, buf, len) : 0;
2479}
2480
2481static void ext4_sb_release(struct kobject *kobj)
2482{
2483 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2484 s_kobj);
2485 complete(&sbi->s_kobj_unregister);
2486}
2487
52cf25d0 2488static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2489 .show = ext4_attr_show,
2490 .store = ext4_attr_store,
2491};
2492
2493static struct kobj_type ext4_ktype = {
2494 .default_attrs = ext4_attrs,
2495 .sysfs_ops = &ext4_attr_ops,
2496 .release = ext4_sb_release,
2497};
2498
857ac889
LC		 2499static void ext4_feat_release(struct kobject *kobj)
2500{
2501 complete(&ext4_feat->f_kobj_unregister);
2502}
2503
2504static struct kobj_type ext4_feat_ktype = {
2505 .default_attrs = ext4_feat_attrs,
2506 .sysfs_ops = &ext4_attr_ops,
2507 .release = ext4_feat_release,
2508};
2509
a13fb1a4
ES		 2510/*
2511 * Check whether this filesystem can be mounted based on
2512 * the features present and the RDONLY/RDWR mount requested.
2513 * Returns 1 if this filesystem can be mounted as requested,
2514 * 0 if it cannot be.
2515 */
2516static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2517{
2518 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2519 ext4_msg(sb, KERN_ERR,
2520 "Couldn't mount because of "
2521 "unsupported optional features (%x)",
2522 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2523 ~EXT4_FEATURE_INCOMPAT_SUPP));
2524 return 0;
2525 }
2526
2527 if (readonly)
2528 return 1;
2529
2530 /* Check that feature set is OK for a read-write mount */
2531 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2532 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2533 "unsupported optional features (%x)",
2534 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2535 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2536 return 0;
2537 }
2538 /*
2539 * Large file size enabled file system can only be mounted
2540 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2541 */
2542 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2543 if (sizeof(blkcnt_t) < sizeof(u64)) {
2544 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2545 "cannot be mounted RDWR without "
2546 "CONFIG_LBDAF");
2547 return 0;
2548 }
2549 }
bab08ab9
TT		 2550 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2551 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2552 ext4_msg(sb, KERN_ERR,
2553 "Can't support bigalloc feature without "
2554 "extents feature\n");
2555 return 0;
2556 }
a13fb1a4
ES		 2557 return 1;
2558}
2559
66e61a9e
TT		 2560/*
2561 * This function is called once a day if we have errors logged
2562 * on the file system
2563 */
2564static void print_daily_error_info(unsigned long arg)
2565{
2566 struct super_block *sb = (struct super_block *) arg;
2567 struct ext4_sb_info *sbi;
2568 struct ext4_super_block *es;
2569
2570 sbi = EXT4_SB(sb);
2571 es = sbi->s_es;
2572
2573 if (es->s_error_count)
2574 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2575 le32_to_cpu(es->s_error_count));
2576 if (es->s_first_error_time) {
2577 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2578 sb->s_id, le32_to_cpu(es->s_first_error_time),
2579 (int) sizeof(es->s_first_error_func),
2580 es->s_first_error_func,
2581 le32_to_cpu(es->s_first_error_line));
2582 if (es->s_first_error_ino)
2583 printk(": inode %u",
2584 le32_to_cpu(es->s_first_error_ino));
2585 if (es->s_first_error_block)
2586 printk(": block %llu", (unsigned long long)
2587 le64_to_cpu(es->s_first_error_block));
2588 printk("\n");
2589 }
2590 if (es->s_last_error_time) {
2591 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2592 sb->s_id, le32_to_cpu(es->s_last_error_time),
2593 (int) sizeof(es->s_last_error_func),
2594 es->s_last_error_func,
2595 le32_to_cpu(es->s_last_error_line));
2596 if (es->s_last_error_ino)
2597 printk(": inode %u",
2598 le32_to_cpu(es->s_last_error_ino));
2599 if (es->s_last_error_block)
2600 printk(": block %llu", (unsigned long long)
2601 le64_to_cpu(es->s_last_error_block));
2602 printk("\n");
2603 }
2604 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2605}
2606
bfff6873
LC		 2607/* Find next suitable group and run ext4_init_inode_table */
2608static int ext4_run_li_request(struct ext4_li_request *elr)
2609{
2610 struct ext4_group_desc *gdp = NULL;
2611 ext4_group_t group, ngroups;
2612 struct super_block *sb;
2613 unsigned long timeout = 0;
2614 int ret = 0;
2615
2616 sb = elr->lr_super;
2617 ngroups = EXT4_SB(sb)->s_groups_count;
2618
2619 for (group = elr->lr_next_group; group < ngroups; group++) {
2620 gdp = ext4_get_group_desc(sb, group, NULL);
2621 if (!gdp) {
2622 ret = 1;
2623 break;
2624 }
2625
2626 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2627 break;
2628 }
2629
2630 if (group == ngroups)
2631 ret = 1;
2632
2633 if (!ret) {
2634 timeout = jiffies;
2635 ret = ext4_init_inode_table(sb, group,
2636 elr->lr_timeout ? 0 : 1);
2637 if (elr->lr_timeout == 0) {
51ce6511
LC		 2638 timeout = (jiffies - timeout) *
2639 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2640 elr->lr_timeout = timeout;
2641 }
2642 elr->lr_next_sched = jiffies + elr->lr_timeout;
2643 elr->lr_next_group = group + 1;
2644 }
2645
2646 return ret;
2647}
2648
2649/*
2650 * Remove lr_request from the list_request and free the
4ed5c033 2651 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2652 */
2653static void ext4_remove_li_request(struct ext4_li_request *elr)
2654{
2655 struct ext4_sb_info *sbi;
2656
2657 if (!elr)
2658 return;
2659
2660 sbi = elr->lr_sbi;
2661
2662 list_del(&elr->lr_request);
2663 sbi->s_li_request = NULL;
2664 kfree(elr);
2665}
2666
2667static void ext4_unregister_li_request(struct super_block *sb)
2668{
1bb933fb
LC		 2669 mutex_lock(&ext4_li_mtx);
2670 if (!ext4_li_info) {
2671 mutex_unlock(&ext4_li_mtx);
bfff6873 2672 return;
1bb933fb 2673 }
bfff6873
LC		 2674
2675 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2676 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2677 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2678 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2679}
2680
8f1f7453
ES		 2681static struct task_struct *ext4_lazyinit_task;
2682
bfff6873
LC		 2683/*
2684 * This is the function where ext4lazyinit thread lives. It walks
2685 * through the request list searching for next scheduled filesystem.
2686 * When such a fs is found, run the lazy initialization request
2687 * (ext4_rn_li_request) and keep track of the time spend in this
2688 * function. Based on that time we compute next schedule time of
2689 * the request. When walking through the list is complete, compute
2690 * next waking time and put itself into sleep.
2691 */
2692static int ext4_lazyinit_thread(void *arg)
2693{
2694 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2695 struct list_head *pos, *n;
2696 struct ext4_li_request *elr;
4ed5c033 2697 unsigned long next_wakeup, cur;
bfff6873
LC		 2698
2699 BUG_ON(NULL == eli);
2700
bfff6873
LC		 2701cont_thread:
2702 while (true) {
2703 next_wakeup = MAX_JIFFY_OFFSET;
2704
2705 mutex_lock(&eli->li_list_mtx);
2706 if (list_empty(&eli->li_request_list)) {
2707 mutex_unlock(&eli->li_list_mtx);
2708 goto exit_thread;
2709 }
2710
2711 list_for_each_safe(pos, n, &eli->li_request_list) {
2712 elr = list_entry(pos, struct ext4_li_request,
2713 lr_request);
2714
b2c78cd0
TT		 2715 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2716 if (ext4_run_li_request(elr) != 0) {
2717 /* error, remove the lazy_init job */
2718 ext4_remove_li_request(elr);
2719 continue;
2720 }
bfff6873
LC		 2721 }
2722
2723 if (time_before(elr->lr_next_sched, next_wakeup))
2724 next_wakeup = elr->lr_next_sched;
2725 }
2726 mutex_unlock(&eli->li_list_mtx);
2727
a0acae0e 2728 try_to_freeze();
bfff6873 2729
4ed5c033
LC		 2730 cur = jiffies;
2731 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2732 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2733 cond_resched();
2734 continue;
2735 }
2736
4ed5c033
LC		 2737 schedule_timeout_interruptible(next_wakeup - cur);
2738
8f1f7453
ES		 2739 if (kthread_should_stop()) {
2740 ext4_clear_request_list();
2741 goto exit_thread;
2742 }
bfff6873
LC		 2743 }
2744
2745exit_thread:
2746 /*
2747 * It looks like the request list is empty, but we need
2748 * to check it under the li_list_mtx lock, to prevent any
2749 * additions into it, and of course we should lock ext4_li_mtx
2750 * to atomically free the list and ext4_li_info, because at
2751 * this point another ext4 filesystem could be registering
2752 * new one.
2753 */
2754 mutex_lock(&ext4_li_mtx);
2755 mutex_lock(&eli->li_list_mtx);
2756 if (!list_empty(&eli->li_request_list)) {
2757 mutex_unlock(&eli->li_list_mtx);
2758 mutex_unlock(&ext4_li_mtx);
2759 goto cont_thread;
2760 }
2761 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2762 kfree(ext4_li_info);
2763 ext4_li_info = NULL;
2764 mutex_unlock(&ext4_li_mtx);
2765
2766 return 0;
2767}
2768
2769static void ext4_clear_request_list(void)
2770{
2771 struct list_head *pos, *n;
2772 struct ext4_li_request *elr;
2773
2774 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2775 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2776 elr = list_entry(pos, struct ext4_li_request,
2777 lr_request);
2778 ext4_remove_li_request(elr);
2779 }
2780 mutex_unlock(&ext4_li_info->li_list_mtx);
2781}
2782
2783static int ext4_run_lazyinit_thread(void)
2784{
8f1f7453
ES		 2785 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2786 ext4_li_info, "ext4lazyinit");
2787 if (IS_ERR(ext4_lazyinit_task)) {
2788 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2789 ext4_clear_request_list();
bfff6873
LC		 2790 kfree(ext4_li_info);
2791 ext4_li_info = NULL;
2792 printk(KERN_CRIT "EXT4: error %d creating inode table "
2793 "initialization thread\n",
2794 err);
2795 return err;
2796 }
2797 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2798 return 0;
2799}
2800
2801/*
2802 * Check whether it make sense to run itable init. thread or not.
2803 * If there is at least one uninitialized inode table, return
2804 * corresponding group number, else the loop goes through all
2805 * groups and return total number of groups.
2806 */
2807static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2808{
2809 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2810 struct ext4_group_desc *gdp = NULL;
2811
2812 for (group = 0; group < ngroups; group++) {
2813 gdp = ext4_get_group_desc(sb, group, NULL);
2814 if (!gdp)
2815 continue;
2816
2817 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2818 break;
2819 }
2820
2821 return group;
2822}
2823
2824static int ext4_li_info_new(void)
2825{
2826 struct ext4_lazy_init *eli = NULL;
2827
2828 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2829 if (!eli)
2830 return -ENOMEM;
2831
bfff6873
LC		 2832 INIT_LIST_HEAD(&eli->li_request_list);
2833 mutex_init(&eli->li_list_mtx);
2834
bfff6873
LC		 2835 eli->li_state |= EXT4_LAZYINIT_QUIT;
2836
2837 ext4_li_info = eli;
2838
2839 return 0;
2840}
2841
2842static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2843 ext4_group_t start)
2844{
2845 struct ext4_sb_info *sbi = EXT4_SB(sb);
2846 struct ext4_li_request *elr;
2847 unsigned long rnd;
2848
2849 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2850 if (!elr)
2851 return NULL;
2852
2853 elr->lr_super = sb;
2854 elr->lr_sbi = sbi;
2855 elr->lr_next_group = start;
2856
2857 /*
2858 * Randomize first schedule time of the request to
2859 * spread the inode table initialization requests
2860 * better.
2861 */
2862 get_random_bytes(&rnd, sizeof(rnd));
2863 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2864 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2865
2866 return elr;
2867}
2868
2869static int ext4_register_li_request(struct super_block *sb,
2870 ext4_group_t first_not_zeroed)
2871{
2872 struct ext4_sb_info *sbi = EXT4_SB(sb);
2873 struct ext4_li_request *elr;
2874 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2875 int ret = 0;
bfff6873 2876
51ce6511
LC		 2877 if (sbi->s_li_request != NULL) {
2878 /*
2879 * Reset timeout so it can be computed again, because
2880 * s_li_wait_mult might have changed.
2881 */
2882 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2883 return 0;
51ce6511 2884 }
bfff6873
LC		 2885
2886 if (first_not_zeroed == ngroups ||
2887 (sb->s_flags & MS_RDONLY) ||
55ff3840 2888 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 2889 return 0;
bfff6873
LC		 2890
2891 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 2892 if (!elr)
2893 return -ENOMEM;
bfff6873
LC		 2894
2895 mutex_lock(&ext4_li_mtx);
2896
2897 if (NULL == ext4_li_info) {
2898 ret = ext4_li_info_new();
2899 if (ret)
2900 goto out;
2901 }
2902
2903 mutex_lock(&ext4_li_info->li_list_mtx);
2904 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2905 mutex_unlock(&ext4_li_info->li_list_mtx);
2906
2907 sbi->s_li_request = elr;
46e4690b
TM		 2908 /*
2909 * set elr to NULL here since it has been inserted to
2910 * the request_list and the removal and free of it is
2911 * handled by ext4_clear_request_list from now on.
2912 */
2913 elr = NULL;
bfff6873
LC		 2914
2915 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2916 ret = ext4_run_lazyinit_thread();
2917 if (ret)
2918 goto out;
2919 }
bfff6873 2920out:
beed5ecb
NK		 2921 mutex_unlock(&ext4_li_mtx);
2922 if (ret)
bfff6873 2923 kfree(elr);
bfff6873
LC		 2924 return ret;
2925}
2926
2927/*
2928 * We do not need to lock anything since this is called on
2929 * module unload.
2930 */
2931static void ext4_destroy_lazyinit_thread(void)
2932{
2933 /*
2934 * If thread exited earlier
2935 * there's nothing to be done.
2936 */
8f1f7453 2937 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2938 return;
2939
8f1f7453 2940 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2941}
2942
2b2d6d01 2943static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 2944{
d4c402d9 2945 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 2946 struct buffer_head *bh;
617ba13b
MC		 2947 struct ext4_super_block *es = NULL;
2948 struct ext4_sb_info *sbi;
2949 ext4_fsblk_t block;
2950 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2951 ext4_fsblk_t logical_sb_block;
ac27a0ec 2952 unsigned long offset = 0;
ac27a0ec
DK		 2953 unsigned long journal_devnum = 0;
2954 unsigned long def_mount_opts;
2955 struct inode *root;
9f6200bb 2956 char *cp;
0390131b 2957 const char *descr;
dcc7dae3 2958 int ret = -ENOMEM;
281b5995 2959 int blocksize, clustersize;
4ec11028
TT		 2960 unsigned int db_count;
2961 unsigned int i;
281b5995 2962 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 2963 __u64 blocks_count;
833f4077 2964 int err;
b3881f74 2965 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 2966 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 2967
2968 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2969 if (!sbi)
dcc7dae3 2970 goto out_free_orig;
705895b6
PE		 2971
2972 sbi->s_blockgroup_lock =
2973 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2974 if (!sbi->s_blockgroup_lock) {
2975 kfree(sbi);
dcc7dae3 2976 goto out_free_orig;
705895b6 2977 }
ac27a0ec
DK		 2978 sb->s_fs_info = sbi;
2979 sbi->s_mount_opt = 0;
617ba13b
MC		 2980 sbi->s_resuid = EXT4_DEF_RESUID;
2981 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2982 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2983 sbi->s_sb_block = sb_block;
f613dfcb
TT		 2984 if (sb->s_bdev->bd_part)
2985 sbi->s_sectors_written_start =
2986 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 2987
9f6200bb
TT		 2988 /* Cleanup superblock name */
2989 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2990 *cp = '!';
2991
dcc7dae3 2992 ret = -EINVAL;
617ba13b 2993 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2994 if (!blocksize) {
b31e1552 2995 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2996 goto out_fail;
2997 }
2998
2999 /*
617ba13b 3000 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3001 * block sizes. We need to calculate the offset from buffer start.
3002 */
617ba13b 3003 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3004 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3005 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3006 } else {
70bbb3e0 3007 logical_sb_block = sb_block;
ac27a0ec
DK		 3008 }
3009
70bbb3e0 3010 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3011 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3012 goto out_fail;
3013 }
3014 /*
3015 * Note: s_es must be initialized as soon as possible because
617ba13b 3016 * some ext4 macro-instructions depend on its value
ac27a0ec 3017 */
617ba13b 3018 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3019 sbi->s_es = es;
3020 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3021 if (sb->s_magic != EXT4_SUPER_MAGIC)
3022 goto cantfind_ext4;
afc32f7e 3023 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3024
3025 /* Set defaults before we parse the mount options */
3026 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3027 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3028 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3029 set_opt(sb, DEBUG);
87f26807 3030 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3031 set_opt(sb, GRPID);
617ba13b 3032 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3033 set_opt(sb, NO_UID32);
ea663336 3034 /* xattr user namespace & acls are now defaulted on */
03010a33 3035#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3036 set_opt(sb, XATTR_USER);
2e7842b8 3037#endif
03010a33 3038#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3039 set_opt(sb, POSIX_ACL);
2e7842b8 3040#endif
6fd7a467 3041 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3042 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3043 set_opt(sb, JOURNAL_DATA);
617ba13b 3044 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3045 set_opt(sb, ORDERED_DATA);
617ba13b 3046 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3047 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3048
3049 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3050 set_opt(sb, ERRORS_PANIC);
bb4f397a 3051 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3052 set_opt(sb, ERRORS_CONT);
bb4f397a 3053 else
fd8c37ec 3054 set_opt(sb, ERRORS_RO);
8b67f04a 3055 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3056 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3057 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3058 set_opt(sb, DISCARD);
ac27a0ec
DK		 3059
3060 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3061 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3062 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3063 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3064 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3065
8b67f04a 3066 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3067 set_opt(sb, BARRIER);
ac27a0ec 3068
dd919b98
AK		 3069 /*
3070 * enable delayed allocation by default
3071 * Use -o nodelalloc to turn it off
3072 */
8b67f04a
TT		 3073 if (!IS_EXT3_SB(sb) &&
3074 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3075 set_opt(sb, DELALLOC);
dd919b98 3076
51ce6511
LC		 3077 /*
3078 * set default s_li_wait_mult for lazyinit, for the case there is
3079 * no mount option specified.
3080 */
3081 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3082
8b67f04a 3083 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3084 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3085 ext4_msg(sb, KERN_WARNING,
3086 "failed to parse options in superblock: %s",
3087 sbi->s_es->s_mount_opts);
3088 }
5a916be1 3089 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3090 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3091 &journal_ioprio, 0))
ac27a0ec
DK		 3092 goto failed_mount;
3093
56889787
TT		 3094 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3095 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3096 "with data=journal disables delayed "
3097 "allocation and O_DIRECT support!\n");
3098 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3099 ext4_msg(sb, KERN_ERR, "can't mount with "
3100 "both data=journal and delalloc");
3101 goto failed_mount;
3102 }
3103 if (test_opt(sb, DIOREAD_NOLOCK)) {
3104 ext4_msg(sb, KERN_ERR, "can't mount with "
3105 "both data=journal and delalloc");
3106 goto failed_mount;
3107 }
3108 if (test_opt(sb, DELALLOC))
3109 clear_opt(sb, DELALLOC);
3110 }
3111
3112 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3113 if (test_opt(sb, DIOREAD_NOLOCK)) {
3114 if (blocksize < PAGE_SIZE) {
3115 ext4_msg(sb, KERN_ERR, "can't mount with "
3116 "dioread_nolock if block size != PAGE_SIZE");
3117 goto failed_mount;
3118 }
3119 }
3120
ac27a0ec 3121 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3122 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3123
617ba13b
MC		 3124 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3125 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3126 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3127 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3128 ext4_msg(sb, KERN_WARNING,
3129 "feature flags set on rev 0 fs, "
3130 "running e2fsck is recommended");
469108ff 3131
2035e776
TT		 3132 if (IS_EXT2_SB(sb)) {
3133 if (ext2_feature_set_ok(sb))
3134 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3135 "using the ext4 subsystem");
3136 else {
3137 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3138 "to feature incompatibilities");
3139 goto failed_mount;
3140 }
3141 }
3142
3143 if (IS_EXT3_SB(sb)) {
3144 if (ext3_feature_set_ok(sb))
3145 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3146 "using the ext4 subsystem");
3147 else {
3148 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3149 "to feature incompatibilities");
3150 goto failed_mount;
3151 }
3152 }
3153
ac27a0ec
DK		 3154 /*
3155 * Check feature flags regardless of the revision level, since we
3156 * previously didn't change the revision level when setting the flags,
3157 * so there is a chance incompat flags are set on a rev 0 filesystem.
3158 */
a13fb1a4 3159 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3160 goto failed_mount;
a13fb1a4 3161
617ba13b
MC		 3162 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3163 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3164 ext4_msg(sb, KERN_ERR,
3165 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3166 goto failed_mount;
3167 }
3168
ac27a0ec 3169 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3170 /* Validate the filesystem blocksize */
3171 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3172 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3173 blocksize);
ac27a0ec
DK		 3174 goto failed_mount;
3175 }
3176
2b2d6d01 3177 brelse(bh);
70bbb3e0
AM		 3178 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3179 offset = do_div(logical_sb_block, blocksize);
3180 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3181 if (!bh) {
b31e1552
ES		 3182 ext4_msg(sb, KERN_ERR,
3183 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3184 goto failed_mount;
3185 }
617ba13b 3186 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3187 sbi->s_es = es;
617ba13b 3188 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3189 ext4_msg(sb, KERN_ERR,
3190 "Magic mismatch, very weird!");
ac27a0ec
DK		 3191 goto failed_mount;
3192 }
3193 }
3194
a13fb1a4
ES		 3195 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3196 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3197 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3198 has_huge_files);
3199 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3200
617ba13b
MC		 3201 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3202 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3203 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3204 } else {
3205 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3206 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3207 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3208 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3209 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3210 ext4_msg(sb, KERN_ERR,
3211 "unsupported inode size: %d",
2b2d6d01 3212 sbi->s_inode_size);
ac27a0ec
DK		 3213 goto failed_mount;
3214 }
ef7f3835
KS		 3215 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3216 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3217 }
0b8e58a1 3218
0d1ee42f
AR		 3219 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3220 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3221 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3222 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3223 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3224 ext4_msg(sb, KERN_ERR,
3225 "unsupported descriptor size %lu",
0d1ee42f
AR		 3226 sbi->s_desc_size);
3227 goto failed_mount;
3228 }
3229 } else
3230 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3231
ac27a0ec 3232 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3233 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3234 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3235 goto cantfind_ext4;
0b8e58a1 3236
617ba13b 3237 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3238 if (sbi->s_inodes_per_block == 0)
617ba13b 3239 goto cantfind_ext4;
ac27a0ec
DK		 3240 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3241 sbi->s_inodes_per_block;
0d1ee42f 3242 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3243 sbi->s_sbh = bh;
3244 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3245 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3246 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3247
2b2d6d01 3248 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3249 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3250 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3251 i = le32_to_cpu(es->s_flags);
3252 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3253 sbi->s_hash_unsigned = 3;
3254 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3255#ifdef __CHAR_UNSIGNED__
3256 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3257 sbi->s_hash_unsigned = 3;
3258#else
3259 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3260#endif
3261 sb->s_dirt = 1;
3262 }
ac27a0ec 3263
281b5995
TT		 3264 /* Handle clustersize */
3265 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3266 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3267 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3268 if (has_bigalloc) {
3269 if (clustersize < blocksize) {
3270 ext4_msg(sb, KERN_ERR,
3271 "cluster size (%d) smaller than "
3272 "block size (%d)", clustersize, blocksize);
3273 goto failed_mount;
3274 }
3275 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3276 le32_to_cpu(es->s_log_block_size);
3277 sbi->s_clusters_per_group =
3278 le32_to_cpu(es->s_clusters_per_group);
3279 if (sbi->s_clusters_per_group > blocksize * 8) {
3280 ext4_msg(sb, KERN_ERR,
3281 "#clusters per group too big: %lu",
3282 sbi->s_clusters_per_group);
3283 goto failed_mount;
3284 }
3285 if (sbi->s_blocks_per_group !=
3286 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3287 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3288 "clusters per group (%lu) inconsistent",
3289 sbi->s_blocks_per_group,
3290 sbi->s_clusters_per_group);
3291 goto failed_mount;
3292 }
3293 } else {
3294 if (clustersize != blocksize) {
3295 ext4_warning(sb, "fragment/cluster size (%d) != "
3296 "block size (%d)", clustersize,
3297 blocksize);
3298 clustersize = blocksize;
3299 }
3300 if (sbi->s_blocks_per_group > blocksize * 8) {
3301 ext4_msg(sb, KERN_ERR,
3302 "#blocks per group too big: %lu",
3303 sbi->s_blocks_per_group);
3304 goto failed_mount;
3305 }
3306 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3307 sbi->s_cluster_bits = 0;
ac27a0ec 3308 }
281b5995
TT		 3309 sbi->s_cluster_ratio = clustersize / blocksize;
3310
ac27a0ec 3311 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3312 ext4_msg(sb, KERN_ERR,
3313 "#inodes per group too big: %lu",
2b2d6d01 3314 sbi->s_inodes_per_group);
ac27a0ec
DK		 3315 goto failed_mount;
3316 }
3317
bf43d84b
ES		 3318 /*
3319 * Test whether we have more sectors than will fit in sector_t,
3320 * and whether the max offset is addressable by the page cache.
3321 */
5a9ae68a 3322 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3323 ext4_blocks_count(es));
5a9ae68a 3324 if (err) {
b31e1552 3325 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3326 " too large to mount safely on this system");
ac27a0ec 3327 if (sizeof(sector_t) < 8)
90c699a9 3328 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3329 ret = err;
ac27a0ec
DK		 3330 goto failed_mount;
3331 }
3332
617ba13b
MC		 3333 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3334 goto cantfind_ext4;
e7c95593 3335
0f2ddca6
FTN		 3336 /* check blocks count against device size */
3337 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3338 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3339 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3340 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3341 ext4_blocks_count(es), blocks_count);
3342 goto failed_mount;
3343 }
3344
0b8e58a1
AD		 3345 /*
3346 * It makes no sense for the first data block to be beyond the end
3347 * of the filesystem.
3348 */
3349 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3350 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3351 "block %u is beyond end of filesystem (%llu)",
3352 le32_to_cpu(es->s_first_data_block),
3353 ext4_blocks_count(es));
e7c95593
ES		 3354 goto failed_mount;
3355 }
bd81d8ee
LV		 3356 blocks_count = (ext4_blocks_count(es) -
3357 le32_to_cpu(es->s_first_data_block) +
3358 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3359 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3360 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3361 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3362 "(block count %llu, first data block %u, "
b31e1552 3363 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3364 ext4_blocks_count(es),
3365 le32_to_cpu(es->s_first_data_block),
3366 EXT4_BLOCKS_PER_GROUP(sb));
3367 goto failed_mount;
3368 }
bd81d8ee 3369 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3370 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3371 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3372 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3373 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3374 sbi->s_group_desc = ext4_kvmalloc(db_count *
3375 sizeof(struct buffer_head *),
3376 GFP_KERNEL);
ac27a0ec 3377 if (sbi->s_group_desc == NULL) {
b31e1552 3378 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3379 goto failed_mount;
3380 }
3381
9f6200bb
TT		 3382 if (ext4_proc_root)
3383 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3384
66acdcf4
TT		 3385 if (sbi->s_proc)
3386 proc_create_data("options", S_IRUGO, sbi->s_proc,
3387 &ext4_seq_options_fops, sb);
3388
705895b6 3389 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3390
3391 for (i = 0; i < db_count; i++) {
70bbb3e0 3392 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3393 sbi->s_group_desc[i] = sb_bread(sb, block);
3394 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3395 ext4_msg(sb, KERN_ERR,
3396 "can't read group descriptor %d", i);
ac27a0ec
DK		 3397 db_count = i;
3398 goto failed_mount2;
3399 }
3400 }
bfff6873 3401 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3402 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3403 goto failed_mount2;
3404 }
772cb7c8
JS		 3405 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3406 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3407 ext4_msg(sb, KERN_ERR,
3408 "unable to initialize "
3409 "flex_bg meta info!");
772cb7c8
JS		 3410 goto failed_mount2;
3411 }
3412
ac27a0ec
DK		 3413 sbi->s_gdb_count = db_count;
3414 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3415 spin_lock_init(&sbi->s_next_gen_lock);
3416
04496411
TM		 3417 init_timer(&sbi->s_err_report);
3418 sbi->s_err_report.function = print_daily_error_info;
3419 sbi->s_err_report.data = (unsigned long) sb;
3420
57042651 3421 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3422 ext4_count_free_clusters(sb));
ce7e010a
TT		 3423 if (!err) {
3424 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3425 ext4_count_free_inodes(sb));
3426 }
3427 if (!err) {
3428 err = percpu_counter_init(&sbi->s_dirs_counter,
3429 ext4_count_dirs(sb));
3430 }
3431 if (!err) {
57042651 3432 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3433 }
3434 if (err) {
3435 ext4_msg(sb, KERN_ERR, "insufficient memory");
3436 goto failed_mount3;
3437 }
3438
c9de560d 3439 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3440 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3441
ac27a0ec
DK		 3442 /*
3443 * set up enough so that it can read an inode
3444 */
9ca92389
TT		 3445 if (!test_opt(sb, NOLOAD) &&
3446 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3447 sb->s_op = &ext4_sops;
3448 else
3449 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3450 sb->s_export_op = &ext4_export_ops;
3451 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3452#ifdef CONFIG_QUOTA
617ba13b
MC		 3453 sb->s_qcop = &ext4_qctl_operations;
3454 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3455#endif
f2fa2ffc
AK		 3456 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3457
ac27a0ec 3458 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3459 mutex_init(&sbi->s_orphan_lock);
8f82f840 3460 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3461
3462 sb->s_root = NULL;
3463
3464 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3465 EXT4_HAS_INCOMPAT_FEATURE(sb,
3466 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3467
c5e06d10
JL		 3468 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3469 !(sb->s_flags & MS_RDONLY))
3470 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3471 goto failed_mount3;
3472
ac27a0ec
DK		 3473 /*
3474 * The first inode we look at is the journal inode. Don't try
3475 * root first: it may be modified in the journal!
3476 */
3477 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3478 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3479 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3480 goto failed_mount3;
0390131b
FM		 3481 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3482 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3483 ext4_msg(sb, KERN_ERR, "required journal recovery "
3484 "suppressed and not mounted read-only");
744692dc 3485 goto failed_mount_wq;
ac27a0ec 3486 } else {
fd8c37ec 3487 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3488 sbi->s_journal = NULL;
3489 needs_recovery = 0;
3490 goto no_journal;
ac27a0ec
DK		 3491 }
3492
eb40a09c
JS		 3493 if (ext4_blocks_count(es) > 0xffffffffULL &&
3494 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3495 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3496 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3497 goto failed_mount_wq;
eb40a09c
JS		 3498 }
3499
d4da6c9c
LT		 3500 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3501 jbd2_journal_set_features(sbi->s_journal,
3502 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3503 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3504 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3505 jbd2_journal_set_features(sbi->s_journal,
3506 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3507 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3508 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3509 } else {
3510 jbd2_journal_clear_features(sbi->s_journal,
3511 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3512 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3513 }
818d276c 3514
ac27a0ec
DK		 3515 /* We have now updated the journal if required, so we can
3516 * validate the data journaling mode. */
3517 switch (test_opt(sb, DATA_FLAGS)) {
3518 case 0:
3519 /* No mode set, assume a default based on the journal
63f57933
AM		 3520 * capabilities: ORDERED_DATA if the journal can
3521 * cope, else JOURNAL_DATA
3522 */
dab291af
MC		 3523 if (jbd2_journal_check_available_features
3524 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3525 set_opt(sb, ORDERED_DATA);
ac27a0ec 3526 else
fd8c37ec 3527 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3528 break;
3529
617ba13b
MC		 3530 case EXT4_MOUNT_ORDERED_DATA:
3531 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3532 if (!jbd2_journal_check_available_features
3533 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3534 ext4_msg(sb, KERN_ERR, "Journal does not support "
3535 "requested data journaling mode");
744692dc 3536 goto failed_mount_wq;
ac27a0ec
DK		 3537 }
3538 default:
3539 break;
3540 }
b3881f74 3541 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3542
18aadd47
BJ		 3543 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3544
ce7e010a
TT		 3545 /*
3546 * The journal may have updated the bg summary counts, so we
3547 * need to update the global counters.
3548 */
57042651 3549 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3550 ext4_count_free_clusters(sb));
ce7e010a
TT		 3551 percpu_counter_set(&sbi->s_freeinodes_counter,
3552 ext4_count_free_inodes(sb));
3553 percpu_counter_set(&sbi->s_dirs_counter,
3554 ext4_count_dirs(sb));
57042651 3555 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3556
ce7e010a 3557no_journal:
fd89d5f2
TH		 3558 /*
3559 * The maximum number of concurrent works can be high and
3560 * concurrency isn't really necessary. Limit it to 1.
3561 */
3562 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3563 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3564 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3565 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3566 goto failed_mount_wq;
3567 }
3568
ac27a0ec 3569 /*
dab291af 3570 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3571 * so we can safely mount the rest of the filesystem now.
3572 */
3573
1d1fe1ee
DH		 3574 root = ext4_iget(sb, EXT4_ROOT_INO);
3575 if (IS_ERR(root)) {
b31e1552 3576 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3577 ret = PTR_ERR(root);
32a9bb57 3578 root = NULL;
ac27a0ec
DK		 3579 goto failed_mount4;
3580 }
3581 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3582 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3583 iput(root);
ac27a0ec
DK		 3584 goto failed_mount4;
3585 }
1d1fe1ee
DH		 3586 sb->s_root = d_alloc_root(root);
3587 if (!sb->s_root) {
94bf608a 3588 iput(root);
b31e1552 3589 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3590 ret = -ENOMEM;
3591 goto failed_mount4;
3592 }
ac27a0ec 3593
2b2d6d01 3594 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3595
3596 /* determine the minimum size of new large inodes, if present */
3597 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3598 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3599 EXT4_GOOD_OLD_INODE_SIZE;
3600 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3601 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3602 if (sbi->s_want_extra_isize <
3603 le16_to_cpu(es->s_want_extra_isize))
3604 sbi->s_want_extra_isize =
3605 le16_to_cpu(es->s_want_extra_isize);
3606 if (sbi->s_want_extra_isize <
3607 le16_to_cpu(es->s_min_extra_isize))
3608 sbi->s_want_extra_isize =
3609 le16_to_cpu(es->s_min_extra_isize);
3610 }
3611 }
3612 /* Check if enough inode space is available */
3613 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3614 sbi->s_inode_size) {
3615 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3616 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3617 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3618 "available");
ef7f3835
KS		 3619 }
3620
6fd058f7
TT		 3621 err = ext4_setup_system_zone(sb);
3622 if (err) {
b31e1552 3623 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3624 "zone (%d)", err);
94bf608a 3625 goto failed_mount4a;
6fd058f7
TT		 3626 }
3627
c2774d84
AK		 3628 ext4_ext_init(sb);
3629 err = ext4_mb_init(sb, needs_recovery);
3630 if (err) {
421f91d2 3631 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3632 err);
dcf2d804 3633 goto failed_mount5;
c2774d84
AK		 3634 }
3635
bfff6873
LC		 3636 err = ext4_register_li_request(sb, first_not_zeroed);
3637 if (err)
dcf2d804 3638 goto failed_mount6;
bfff6873 3639
3197ebdb
TT		 3640 sbi->s_kobj.kset = ext4_kset;
3641 init_completion(&sbi->s_kobj_unregister);
3642 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3643 "%s", sb->s_id);
dcf2d804
TM		 3644 if (err)
3645 goto failed_mount7;
3197ebdb 3646
617ba13b
MC		 3647 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3648 ext4_orphan_cleanup(sb, es);
3649 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3650 if (needs_recovery) {
b31e1552 3651 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3652 ext4_mark_recovery_complete(sb, es);
3653 }
3654 if (EXT4_SB(sb)->s_journal) {
3655 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3656 descr = " journalled data mode";
3657 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3658 descr = " ordered data mode";
3659 else
3660 descr = " writeback data mode";
3661 } else
3662 descr = "out journal";
3663
d4c402d9 3664 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3665 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3666 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3667
66e61a9e
TT		 3668 if (es->s_error_count)
3669 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3670
d4c402d9 3671 kfree(orig_data);
ac27a0ec
DK		 3672 return 0;
3673
617ba13b 3674cantfind_ext4:
ac27a0ec 3675 if (!silent)
b31e1552 3676 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3677 goto failed_mount;
3678
dcf2d804
TM		 3679failed_mount7:
3680 ext4_unregister_li_request(sb);
3681failed_mount6:
dcf2d804 3682 ext4_mb_release(sb);
94bf608a
AV		 3683failed_mount5:
3684 ext4_ext_release(sb);
dcf2d804 3685 ext4_release_system_zone(sb);
94bf608a
AV		 3686failed_mount4a:
3687 dput(sb->s_root);
32a9bb57 3688 sb->s_root = NULL;
94bf608a 3689failed_mount4:
b31e1552 3690 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3691 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3692failed_mount_wq:
0390131b
FM		 3693 if (sbi->s_journal) {
3694 jbd2_journal_destroy(sbi->s_journal);
3695 sbi->s_journal = NULL;
3696 }
ac27a0ec 3697failed_mount3:
04496411 3698 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3699 if (sbi->s_flex_groups)
3700 ext4_kvfree(sbi->s_flex_groups);
57042651 3701 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3702 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3703 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3704 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3705 if (sbi->s_mmp_tsk)
3706 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3707failed_mount2:
3708 for (i = 0; i < db_count; i++)
3709 brelse(sbi->s_group_desc[i]);
f18a5f21 3710 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3711failed_mount:
240799cd 3712 if (sbi->s_proc) {
66acdcf4 3713 remove_proc_entry("options", sbi->s_proc);
9f6200bb 3714 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3715 }
ac27a0ec
DK		 3716#ifdef CONFIG_QUOTA
3717 for (i = 0; i < MAXQUOTAS; i++)
3718 kfree(sbi->s_qf_names[i]);
3719#endif
617ba13b 3720 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3721 brelse(bh);
3722out_fail:
3723 sb->s_fs_info = NULL;
f6830165 3724 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3725 kfree(sbi);
dcc7dae3 3726out_free_orig:
d4c402d9 3727 kfree(orig_data);
1d1fe1ee 3728 return ret;
ac27a0ec
DK		 3729}
3730
3731/*
3732 * Setup any per-fs journal parameters now. We'll do this both on
3733 * initial mount, once the journal has been initialised but before we've
3734 * done any recovery; and again on any subsequent remount.
3735 */
617ba13b 3736static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3737{
617ba13b 3738 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3739
30773840
TT		 3740 journal->j_commit_interval = sbi->s_commit_interval;
3741 journal->j_min_batch_time = sbi->s_min_batch_time;
3742 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3743
a931da6a 3744 write_lock(&journal->j_state_lock);
ac27a0ec 3745 if (test_opt(sb, BARRIER))
dab291af 3746 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3747 else
dab291af 3748 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3749 if (test_opt(sb, DATA_ERR_ABORT))
3750 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3751 else
3752 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3753 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3754}
3755
617ba13b 3756static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3757 unsigned int journal_inum)
3758{
3759 struct inode *journal_inode;
3760 journal_t *journal;
3761
0390131b
FM		 3762 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3763
ac27a0ec
DK		 3764 /* First, test for the existence of a valid inode on disk. Bad
3765 * things happen if we iget() an unused inode, as the subsequent
3766 * iput() will try to delete it. */
3767
1d1fe1ee
DH		 3768 journal_inode = ext4_iget(sb, journal_inum);
3769 if (IS_ERR(journal_inode)) {
b31e1552 3770 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3771 return NULL;
3772 }
3773 if (!journal_inode->i_nlink) {
3774 make_bad_inode(journal_inode);
3775 iput(journal_inode);
b31e1552 3776 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3777 return NULL;
3778 }
3779
e5f8eab8 3780 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3781 journal_inode, journal_inode->i_size);
1d1fe1ee 3782 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3783 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3784 iput(journal_inode);
3785 return NULL;
3786 }
3787
dab291af 3788 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3789 if (!journal) {
b31e1552 3790 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3791 iput(journal_inode);
3792 return NULL;
3793 }
3794 journal->j_private = sb;
617ba13b 3795 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3796 return journal;
3797}
3798
617ba13b 3799static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3800 dev_t j_dev)
3801{
2b2d6d01 3802 struct buffer_head *bh;
ac27a0ec 3803 journal_t *journal;
617ba13b
MC		 3804 ext4_fsblk_t start;
3805 ext4_fsblk_t len;
ac27a0ec 3806 int hblock, blocksize;
617ba13b 3807 ext4_fsblk_t sb_block;
ac27a0ec 3808 unsigned long offset;
2b2d6d01 3809 struct ext4_super_block *es;
ac27a0ec
DK		 3810 struct block_device *bdev;
3811
0390131b
FM		 3812 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3813
b31e1552 3814 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3815 if (bdev == NULL)
3816 return NULL;
3817
ac27a0ec 3818 blocksize = sb->s_blocksize;
e1defc4f 3819 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3820 if (blocksize < hblock) {
b31e1552
ES		 3821 ext4_msg(sb, KERN_ERR,
3822 "blocksize too small for journal device");
ac27a0ec
DK		 3823 goto out_bdev;
3824 }
3825
617ba13b
MC		 3826 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3827 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3828 set_blocksize(bdev, blocksize);
3829 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3830 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3831 "external journal");
ac27a0ec
DK		 3832 goto out_bdev;
3833 }
3834
617ba13b
MC		 3835 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3836 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3837 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3838 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3839 ext4_msg(sb, KERN_ERR, "external journal has "
3840 "bad superblock");
ac27a0ec
DK		 3841 brelse(bh);
3842 goto out_bdev;
3843 }
3844
617ba13b 3845 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3846 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3847 brelse(bh);
3848 goto out_bdev;
3849 }
3850
bd81d8ee 3851 len = ext4_blocks_count(es);
ac27a0ec
DK		 3852 start = sb_block + 1;
3853 brelse(bh); /* we're done with the superblock */
3854
dab291af 3855 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3856 start, len, blocksize);
3857 if (!journal) {
b31e1552 3858 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3859 goto out_bdev;
3860 }
3861 journal->j_private = sb;
3862 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3863 wait_on_buffer(journal->j_sb_buffer);
3864 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3865 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3866 goto out_journal;
3867 }
3868 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3869 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3870 "user (unsupported) - %d",
ac27a0ec
DK		 3871 be32_to_cpu(journal->j_superblock->s_nr_users));
3872 goto out_journal;
3873 }
617ba13b
MC		 3874 EXT4_SB(sb)->journal_bdev = bdev;
3875 ext4_init_journal_params(sb, journal);
ac27a0ec 3876 return journal;
0b8e58a1 3877
ac27a0ec 3878out_journal:
dab291af 3879 jbd2_journal_destroy(journal);
ac27a0ec 3880out_bdev:
617ba13b 3881 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3882 return NULL;
3883}
3884
617ba13b
MC		 3885static int ext4_load_journal(struct super_block *sb,
3886 struct ext4_super_block *es,
ac27a0ec
DK		 3887 unsigned long journal_devnum)
3888{
3889 journal_t *journal;
3890 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3891 dev_t journal_dev;
3892 int err = 0;
3893 int really_read_only;
3894
0390131b
FM		 3895 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3896
ac27a0ec
DK		 3897 if (journal_devnum &&
3898 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3899 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3900 "numbers have changed");
ac27a0ec
DK		 3901 journal_dev = new_decode_dev(journal_devnum);
3902 } else
3903 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3904
3905 really_read_only = bdev_read_only(sb->s_bdev);
3906
3907 /*
3908 * Are we loading a blank journal or performing recovery after a
3909 * crash? For recovery, we need to check in advance whether we
3910 * can get read-write access to the device.
3911 */
617ba13b 3912 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3913 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3914 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3915 "required on readonly filesystem");
ac27a0ec 3916 if (really_read_only) {
b31e1552
ES		 3917 ext4_msg(sb, KERN_ERR, "write access "
3918 "unavailable, cannot proceed");
ac27a0ec
DK		 3919 return -EROFS;
3920 }
b31e1552
ES		 3921 ext4_msg(sb, KERN_INFO, "write access will "
3922 "be enabled during recovery");
ac27a0ec
DK		 3923 }
3924 }
3925
3926 if (journal_inum && journal_dev) {
b31e1552
ES		 3927 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3928 "and inode journals!");
ac27a0ec
DK		 3929 return -EINVAL;
3930 }
3931
3932 if (journal_inum) {
617ba13b 3933 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3934 return -EINVAL;
3935 } else {
617ba13b 3936 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3937 return -EINVAL;
3938 }
3939
90576c0b 3940 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3941 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3942
617ba13b 3943 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3944 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 3945 if (!err) {
3946 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3947 if (save)
3948 memcpy(save, ((char *) es) +
3949 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 3950 err = jbd2_journal_load(journal);
1c13d5c0
TT		 3951 if (save)
3952 memcpy(((char *) es) + EXT4_S_ERR_START,
3953 save, EXT4_S_ERR_LEN);
3954 kfree(save);
3955 }
ac27a0ec
DK		 3956
3957 if (err) {
b31e1552 3958 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3959 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3960 return err;
3961 }
3962
617ba13b
MC		 3963 EXT4_SB(sb)->s_journal = journal;
3964 ext4_clear_journal_err(sb, es);
ac27a0ec 3965
c41303ce 3966 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 3967 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3968 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3969
3970 /* Make sure we flush the recovery flag to disk. */
e2d67052 3971 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3972 }
3973
3974 return 0;
3975}
3976
e2d67052 3977static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3978{
e2d67052 3979 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3980 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3981 int error = 0;
ac27a0ec 3982
7c2e7087 3983 if (!sbh || block_device_ejected(sb))
c4be0c1d 3984 return error;
914258bf
TT		 3985 if (buffer_write_io_error(sbh)) {
3986 /*
3987 * Oh, dear. A previous attempt to write the
3988 * superblock failed. This could happen because the
3989 * USB device was yanked out. Or it could happen to
3990 * be a transient write error and maybe the block will
3991 * be remapped. Nothing we can do but to retry the
3992 * write and hope for the best.
3993 */
b31e1552
ES		 3994 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3995 "superblock detected");
914258bf
TT		 3996 clear_buffer_write_io_error(sbh);
3997 set_buffer_uptodate(sbh);
3998 }
71290b36
TT		 3999 /*
4000 * If the file system is mounted read-only, don't update the
4001 * superblock write time. This avoids updating the superblock
4002 * write time when we are mounting the root file system
4003 * read/only but we need to replay the journal; at that point,
4004 * for people who are east of GMT and who make their clock
4005 * tick in localtime for Windows bug-for-bug compatibility,
4006 * the clock is set in the future, and this will cause e2fsck
4007 * to complain and force a full file system check.
4008 */
4009 if (!(sb->s_flags & MS_RDONLY))
4010 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4011 if (sb->s_bdev->bd_part)
4012 es->s_kbytes_written =
4013 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4014 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4015 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4016 else
4017 es->s_kbytes_written =
4018 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4019 ext4_free_blocks_count_set(es,
4020 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4021 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4022 es->s_free_inodes_count =
4023 cpu_to_le32(percpu_counter_sum_positive(
4024 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4025 sb->s_dirt = 0;
ac27a0ec
DK		 4026 BUFFER_TRACE(sbh, "marking dirty");
4027 mark_buffer_dirty(sbh);
914258bf 4028 if (sync) {
c4be0c1d
TS		 4029 error = sync_dirty_buffer(sbh);
4030 if (error)
4031 return error;
4032
4033 error = buffer_write_io_error(sbh);
4034 if (error) {
b31e1552
ES		 4035 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4036 "superblock");
914258bf
TT		 4037 clear_buffer_write_io_error(sbh);
4038 set_buffer_uptodate(sbh);
4039 }
4040 }
c4be0c1d 4041 return error;
ac27a0ec
DK		 4042}
4043
ac27a0ec
DK		 4044/*
4045 * Have we just finished recovery? If so, and if we are mounting (or
4046 * remounting) the filesystem readonly, then we will end up with a
4047 * consistent fs on disk. Record that fact.
4048 */
2b2d6d01
TT		 4049static void ext4_mark_recovery_complete(struct super_block *sb,
4050 struct ext4_super_block *es)
ac27a0ec 4051{
617ba13b 4052 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4053
0390131b
FM		 4054 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4055 BUG_ON(journal != NULL);
4056 return;
4057 }
dab291af 4058 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4059 if (jbd2_journal_flush(journal) < 0)
4060 goto out;
4061
617ba13b 4062 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4063 sb->s_flags & MS_RDONLY) {
617ba13b 4064 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4065 ext4_commit_super(sb, 1);
ac27a0ec 4066 }
7ffe1ea8
HK		 4067
4068out:
dab291af 4069 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4070}
4071
4072/*
4073 * If we are mounting (or read-write remounting) a filesystem whose journal
4074 * has recorded an error from a previous lifetime, move that error to the
4075 * main filesystem now.
4076 */
2b2d6d01
TT		 4077static void ext4_clear_journal_err(struct super_block *sb,
4078 struct ext4_super_block *es)
ac27a0ec
DK		 4079{
4080 journal_t *journal;
4081 int j_errno;
4082 const char *errstr;
4083
0390131b
FM		 4084 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4085
617ba13b 4086 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4087
4088 /*
4089 * Now check for any error status which may have been recorded in the
617ba13b 4090 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4091 */
4092
dab291af 4093 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4094 if (j_errno) {
4095 char nbuf[16];
4096
617ba13b 4097 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4098 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4099 "from previous mount: %s", errstr);
12062ddd 4100 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4101
617ba13b
MC		 4102 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4103 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4104 ext4_commit_super(sb, 1);
ac27a0ec 4105
dab291af 4106 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4107 }
4108}
4109
4110/*
4111 * Force the running and committing transactions to commit,
4112 * and wait on the commit.
4113 */
617ba13b 4114int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4115{
4116 journal_t *journal;
0390131b 4117 int ret = 0;
ac27a0ec
DK		 4118
4119 if (sb->s_flags & MS_RDONLY)
4120 return 0;
4121
617ba13b 4122 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4123 if (journal) {
437f88cc 4124 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4125 ret = ext4_journal_force_commit(journal);
6b0310fb 4126 }
0390131b 4127
ac27a0ec
DK		 4128 return ret;
4129}
4130
2b2d6d01 4131static void ext4_write_super(struct super_block *sb)
ac27a0ec 4132{
ebc1ac16 4133 lock_super(sb);
9ca92389 4134 ext4_commit_super(sb, 1);
ebc1ac16 4135 unlock_super(sb);
ac27a0ec
DK		 4136}
4137
617ba13b 4138static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4139{
14ce0cb4 4140 int ret = 0;
9eddacf9 4141 tid_t target;
8d5d02e6 4142 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4143
9bffad1e 4144 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4145 flush_workqueue(sbi->dio_unwritten_wq);
4146 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4147 if (wait)
8d5d02e6 4148 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4149 }
14ce0cb4 4150 return ret;
ac27a0ec
DK		 4151}
4152
4153/*
4154 * LVM calls this function before a (read-only) snapshot is created. This
4155 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4156 *
4157 * Note that only this function cannot bring a filesystem to be in a clean
4158 * state independently, because ext4 prevents a new handle from being started
4159 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4160 * the upper layer.
ac27a0ec 4161 */
c4be0c1d 4162static int ext4_freeze(struct super_block *sb)
ac27a0ec 4163{
c4be0c1d
TS		 4164 int error = 0;
4165 journal_t *journal;
ac27a0ec 4166
9ca92389
TT		 4167 if (sb->s_flags & MS_RDONLY)
4168 return 0;
ac27a0ec 4169
9ca92389 4170 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4171
9ca92389
TT		 4172 /* Now we set up the journal barrier. */
4173 jbd2_journal_lock_updates(journal);
ac27a0ec 4174
9ca92389
TT		 4175 /*
4176 * Don't clear the needs_recovery flag if we failed to flush
4177 * the journal.
4178 */
4179 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4180 if (error < 0)
4181 goto out;
9ca92389
TT		 4182
4183 /* Journal blocked and flushed, clear needs_recovery flag. */
4184 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4185 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4186out:
4187 /* we rely on s_frozen to stop further updates */
4188 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4189 return error;
ac27a0ec
DK		 4190}
4191
4192/*
4193 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4194 * flag here, even though the filesystem is not technically dirty yet.
4195 */
c4be0c1d 4196static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4197{
9ca92389
TT		 4198 if (sb->s_flags & MS_RDONLY)
4199 return 0;
4200
4201 lock_super(sb);
4202 /* Reset the needs_recovery flag before the fs is unlocked. */
4203 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4204 ext4_commit_super(sb, 1);
4205 unlock_super(sb);
c4be0c1d 4206 return 0;
ac27a0ec
DK		 4207}
4208
673c6100
TT		 4209/*
4210 * Structure to save mount options for ext4_remount's benefit
4211 */
4212struct ext4_mount_options {
4213 unsigned long s_mount_opt;
a2595b8a 4214 unsigned long s_mount_opt2;
673c6100
TT		 4215 uid_t s_resuid;
4216 gid_t s_resgid;
4217 unsigned long s_commit_interval;
4218 u32 s_min_batch_time, s_max_batch_time;
4219#ifdef CONFIG_QUOTA
4220 int s_jquota_fmt;
4221 char *s_qf_names[MAXQUOTAS];
4222#endif
4223};
4224
2b2d6d01 4225static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4226{
2b2d6d01 4227 struct ext4_super_block *es;
617ba13b 4228 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4229 unsigned long old_sb_flags;
617ba13b 4230 struct ext4_mount_options old_opts;
c79d967d 4231 int enable_quota = 0;
8a266467 4232 ext4_group_t g;
b3881f74 4233 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4234 int err = 0;
ac27a0ec
DK		 4235#ifdef CONFIG_QUOTA
4236 int i;
4237#endif
d4c402d9 4238 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4239
4240 /* Store the original options */
bbd6851a 4241 lock_super(sb);
ac27a0ec
DK		 4242 old_sb_flags = sb->s_flags;
4243 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4244 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4245 old_opts.s_resuid = sbi->s_resuid;
4246 old_opts.s_resgid = sbi->s_resgid;
4247 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4248 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4249 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4250#ifdef CONFIG_QUOTA
4251 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4252 for (i = 0; i < MAXQUOTAS; i++)
4253 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4254#endif
b3881f74
TT		 4255 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4256 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4257
4258 /*
4259 * Allow the "check" option to be passed as a remount option.
4260 */
661aa520 4261 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4262 err = -EINVAL;
4263 goto restore_opts;
4264 }
4265
4ab2f15b 4266 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4267 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4268
4269 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4270 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4271
4272 es = sbi->s_es;
4273
b3881f74 4274 if (sbi->s_journal) {
0390131b 4275 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4276 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4277 }
ac27a0ec 4278
661aa520 4279 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4280 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4281 err = -EROFS;
4282 goto restore_opts;
4283 }
4284
4285 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4286 err = dquot_suspend(sb, -1);
4287 if (err < 0)
c79d967d 4288 goto restore_opts;
c79d967d 4289
ac27a0ec
DK		 4290 /*
4291 * First of all, the unconditional stuff we have to do
4292 * to disable replay of the journal when we next remount
4293 */
4294 sb->s_flags |= MS_RDONLY;
4295
4296 /*
4297 * OK, test if we are remounting a valid rw partition
4298 * readonly, and if so set the rdonly flag and then
4299 * mark the partition as valid again.
4300 */
617ba13b
MC		 4301 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4302 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4303 es->s_state = cpu_to_le16(sbi->s_mount_state);
4304
a63c9eb2 4305 if (sbi->s_journal)
0390131b 4306 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4307 } else {
a13fb1a4
ES		 4308 /* Make sure we can mount this feature set readwrite */
4309 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4310 err = -EROFS;
4311 goto restore_opts;
4312 }
8a266467
TT		 4313 /*
4314 * Make sure the group descriptor checksums
0b8e58a1 4315 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4316 */
4317 for (g = 0; g < sbi->s_groups_count; g++) {
4318 struct ext4_group_desc *gdp =
4319 ext4_get_group_desc(sb, g, NULL);
4320
4321 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4322 ext4_msg(sb, KERN_ERR,
4323 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4324 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4325 le16_to_cpu(gdp->bg_checksum));
4326 err = -EINVAL;
4327 goto restore_opts;
4328 }
4329 }
4330
ead6596b
ES		 4331 /*
4332 * If we have an unprocessed orphan list hanging
4333 * around from a previously readonly bdev mount,
4334 * require a full umount/remount for now.
4335 */
4336 if (es->s_last_orphan) {
b31e1552 4337 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4338 "remount RDWR because of unprocessed "
4339 "orphan inode list. Please "
b31e1552 4340 "umount/remount instead");
ead6596b
ES		 4341 err = -EINVAL;
4342 goto restore_opts;
4343 }
4344
ac27a0ec
DK		 4345 /*
4346 * Mounting a RDONLY partition read-write, so reread
4347 * and store the current valid flag. (It may have
4348 * been changed by e2fsck since we originally mounted
4349 * the partition.)
4350 */
0390131b
FM		 4351 if (sbi->s_journal)
4352 ext4_clear_journal_err(sb, es);
ac27a0ec 4353 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4354 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4355 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4356 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4357 EXT4_FEATURE_INCOMPAT_MMP))
4358 if (ext4_multi_mount_protect(sb,
4359 le64_to_cpu(es->s_mmp_block))) {
4360 err = -EROFS;
4361 goto restore_opts;
4362 }
c79d967d 4363 enable_quota = 1;
ac27a0ec
DK		 4364 }
4365 }
bfff6873
LC		 4366
4367 /*
4368 * Reinitialize lazy itable initialization thread based on
4369 * current settings
4370 */
4371 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4372 ext4_unregister_li_request(sb);
4373 else {
4374 ext4_group_t first_not_zeroed;
4375 first_not_zeroed = ext4_has_uninit_itable(sb);
4376 ext4_register_li_request(sb, first_not_zeroed);
4377 }
4378
6fd058f7 4379 ext4_setup_system_zone(sb);
0390131b 4380 if (sbi->s_journal == NULL)
e2d67052 4381 ext4_commit_super(sb, 1);
0390131b 4382
ac27a0ec
DK		 4383#ifdef CONFIG_QUOTA
4384 /* Release old quota file names */
4385 for (i = 0; i < MAXQUOTAS; i++)
4386 if (old_opts.s_qf_names[i] &&
4387 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4388 kfree(old_opts.s_qf_names[i]);
4389#endif
bbd6851a 4390 unlock_super(sb);
c79d967d 4391 if (enable_quota)
0f0dd62f 4392 dquot_resume(sb, -1);
d4c402d9
CW		 4393
4394 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4395 kfree(orig_data);
ac27a0ec 4396 return 0;
0b8e58a1 4397
ac27a0ec
DK		 4398restore_opts:
4399 sb->s_flags = old_sb_flags;
4400 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4401 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4402 sbi->s_resuid = old_opts.s_resuid;
4403 sbi->s_resgid = old_opts.s_resgid;
4404 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4405 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4406 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4407#ifdef CONFIG_QUOTA
4408 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4409 for (i = 0; i < MAXQUOTAS; i++) {
4410 if (sbi->s_qf_names[i] &&
4411 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4412 kfree(sbi->s_qf_names[i]);
4413 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4414 }
4415#endif
bbd6851a 4416 unlock_super(sb);
d4c402d9 4417 kfree(orig_data);
ac27a0ec
DK		 4418 return err;
4419}
4420
f975d6bc
TT		 4421/*
4422 * Note: calculating the overhead so we can be compatible with
4423 * historical BSD practice is quite difficult in the face of
4424 * clusters/bigalloc. This is because multiple metadata blocks from
4425 * different block group can end up in the same allocation cluster.
4426 * Calculating the exact overhead in the face of clustered allocation
4427 * requires either O(all block bitmaps) in memory or O(number of block
4428 * groups**2) in time. We will still calculate the superblock for
4429 * older file systems --- and if we come across with a bigalloc file
4430 * system with zero in s_overhead_clusters the estimate will be close to
4431 * correct especially for very large cluster sizes --- but for newer
4432 * file systems, it's better to calculate this figure once at mkfs
4433 * time, and store it in the superblock. If the superblock value is
4434 * present (even for non-bigalloc file systems), we will use it.
4435 */
2b2d6d01 4436static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4437{
4438 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4439 struct ext4_sb_info *sbi = EXT4_SB(sb);
4440 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4441 struct ext4_group_desc *gdp;
960cc398 4442 u64 fsid;
d02a9391 4443 s64 bfree;
ac27a0ec 4444
5e70030d
BP		 4445 if (test_opt(sb, MINIX_DF)) {
4446 sbi->s_overhead_last = 0;
f975d6bc
TT		 4447 } else if (es->s_overhead_clusters) {
4448 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4449 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4450 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4451 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4452
4453 /*
5e70030d
BP		 4454 * Compute the overhead (FS structures). This is constant
4455 * for a given filesystem unless the number of block groups
4456 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4457 */
4458
4459 /*
4460 * All of the blocks before first_data_block are
4461 * overhead
4462 */
f975d6bc 4463 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4464
4465 /*
f975d6bc 4466 * Add the overhead found in each block group
ac27a0ec
DK		 4467 */
4468 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4469 gdp = ext4_get_group_desc(sb, i, NULL);
4470 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4471 cond_resched();
4472 }
5e70030d
BP		 4473 sbi->s_overhead_last = overhead;
4474 smp_wmb();
6bc9feff 4475 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4476 }
4477
617ba13b 4478 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4479 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4480 buf->f_blocks = (ext4_blocks_count(es) -
4481 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4482 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4483 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4484 /* prevent underflow in case that few free space is available */
57042651 4485 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4486 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4487 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4488 buf->f_bavail = 0;
4489 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4490 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4491 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4492 fsid = le64_to_cpup((void *)es->s_uuid) ^
4493 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4494 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4495 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4496
ac27a0ec
DK		 4497 return 0;
4498}
4499
0b8e58a1
AD		 4500/* Helper function for writing quotas on sync - we need to start transaction
4501 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4502 * Process 1 Process 2
617ba13b 4503 * ext4_create() quota_sync()
a269eb18 4504 * jbd2_journal_start() write_dquot()
871a2931 4505 * dquot_initialize() down(dqio_mutex)
dab291af 4506 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4507 *
4508 */
4509
4510#ifdef CONFIG_QUOTA
4511
4512static inline struct inode *dquot_to_inode(struct dquot *dquot)
4513{
4514 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4515}
4516
617ba13b 4517static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4518{
4519 int ret, err;
4520 handle_t *handle;
4521 struct inode *inode;
4522
4523 inode = dquot_to_inode(dquot);
617ba13b 4524 handle = ext4_journal_start(inode,
0b8e58a1 4525 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4526 if (IS_ERR(handle))
4527 return PTR_ERR(handle);
4528 ret = dquot_commit(dquot);
617ba13b 4529 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4530 if (!ret)
4531 ret = err;
4532 return ret;
4533}
4534
617ba13b 4535static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4536{
4537 int ret, err;
4538 handle_t *handle;
4539
617ba13b 4540 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4541 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4542 if (IS_ERR(handle))
4543 return PTR_ERR(handle);
4544 ret = dquot_acquire(dquot);
617ba13b 4545 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4546 if (!ret)
4547 ret = err;
4548 return ret;
4549}
4550
617ba13b 4551static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4552{
4553 int ret, err;
4554 handle_t *handle;
4555
617ba13b 4556 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4557 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4558 if (IS_ERR(handle)) {
4559 /* Release dquot anyway to avoid endless cycle in dqput() */
4560 dquot_release(dquot);
ac27a0ec 4561 return PTR_ERR(handle);
9c3013e9 4562 }
ac27a0ec 4563 ret = dquot_release(dquot);
617ba13b 4564 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4565 if (!ret)
4566 ret = err;
4567 return ret;
4568}
4569
617ba13b 4570static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4571{
2c8be6b2 4572 /* Are we journaling quotas? */
617ba13b
MC		 4573 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4574 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4575 dquot_mark_dquot_dirty(dquot);
617ba13b 4576 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4577 } else {
4578 return dquot_mark_dquot_dirty(dquot);
4579 }
4580}
4581
617ba13b 4582static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4583{
4584 int ret, err;
4585 handle_t *handle;
4586
4587 /* Data block + inode block */
617ba13b 4588 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4589 if (IS_ERR(handle))
4590 return PTR_ERR(handle);
4591 ret = dquot_commit_info(sb, type);
617ba13b 4592 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4593 if (!ret)
4594 ret = err;
4595 return ret;
4596}
4597
4598/*
4599 * Turn on quotas during mount time - we need to find
4600 * the quota file and such...
4601 */
617ba13b 4602static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4603{
287a8095
CH		 4604 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4605 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4606}
4607
4608/*
4609 * Standard function to be called on quota_on
4610 */
617ba13b 4611static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4612 struct path *path)
ac27a0ec
DK		 4613{
4614 int err;
ac27a0ec
DK		 4615
4616 if (!test_opt(sb, QUOTA))
4617 return -EINVAL;
0623543b 4618
ac27a0ec 4619 /* Quotafile not on the same filesystem? */
d8c9584e 4620 if (path->dentry->d_sb != sb)
ac27a0ec 4621 return -EXDEV;
0623543b
JK		 4622 /* Journaling quota? */
4623 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4624 /* Quotafile not in fs root? */
f00c9e44 4625 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4626 ext4_msg(sb, KERN_WARNING,
4627 "Quota file not on filesystem root. "
4628 "Journaled quota will not work");
2b2d6d01 4629 }
0623543b
JK		 4630
4631 /*
4632 * When we journal data on quota file, we have to flush journal to see
4633 * all updates to the file when we bypass pagecache...
4634 */
0390131b 4635 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4636 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4637 /*
4638 * We don't need to lock updates but journal_flush() could
4639 * otherwise be livelocked...
4640 */
4641 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4642 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4643 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4644 if (err)
7ffe1ea8 4645 return err;
0623543b
JK		 4646 }
4647
f00c9e44 4648 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4649}
4650
ca0e05e4
DM		 4651static int ext4_quota_off(struct super_block *sb, int type)
4652{
21f97697
JK		 4653 struct inode *inode = sb_dqopt(sb)->files[type];
4654 handle_t *handle;
4655
87009d86
DM		 4656 /* Force all delayed allocation blocks to be allocated.
4657 * Caller already holds s_umount sem */
4658 if (test_opt(sb, DELALLOC))
ca0e05e4 4659 sync_filesystem(sb);
ca0e05e4 4660
0b268590
AG		 4661 if (!inode)
4662 goto out;
4663
21f97697
JK		 4664 /* Update modification times of quota files when userspace can
4665 * start looking at them */
4666 handle = ext4_journal_start(inode, 1);
4667 if (IS_ERR(handle))
4668 goto out;
4669 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4670 ext4_mark_inode_dirty(handle, inode);
4671 ext4_journal_stop(handle);
4672
4673out:
ca0e05e4
DM		 4674 return dquot_quota_off(sb, type);
4675}
4676
ac27a0ec
DK		 4677/* Read data from quotafile - avoid pagecache and such because we cannot afford
4678 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4679 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4680 * we don't have to be afraid of races */
617ba13b 4681static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4682 size_t len, loff_t off)
4683{
4684 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4685 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4686 int err = 0;
4687 int offset = off & (sb->s_blocksize - 1);
4688 int tocopy;
4689 size_t toread;
4690 struct buffer_head *bh;
4691 loff_t i_size = i_size_read(inode);
4692
4693 if (off > i_size)
4694 return 0;
4695 if (off+len > i_size)
4696 len = i_size-off;
4697 toread = len;
4698 while (toread > 0) {
4699 tocopy = sb->s_blocksize - offset < toread ?
4700 sb->s_blocksize - offset : toread;
617ba13b 4701 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4702 if (err)
4703 return err;
4704 if (!bh) /* A hole? */
4705 memset(data, 0, tocopy);
4706 else
4707 memcpy(data, bh->b_data+offset, tocopy);
4708 brelse(bh);
4709 offset = 0;
4710 toread -= tocopy;
4711 data += tocopy;
4712 blk++;
4713 }
4714 return len;
4715}
4716
4717/* Write to quotafile (we know the transaction is already started and has
4718 * enough credits) */
617ba13b 4719static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4720 const char *data, size_t len, loff_t off)
4721{
4722 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4723 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4724 int err = 0;
4725 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4726 struct buffer_head *bh;
4727 handle_t *handle = journal_current_handle();
4728
0390131b 4729 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4730 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4731 " cancelled because transaction is not started",
9c3013e9
JK		 4732 (unsigned long long)off, (unsigned long long)len);
4733 return -EIO;
4734 }
67eeb568
DM		 4735 /*
4736 * Since we account only one data block in transaction credits,
4737 * then it is impossible to cross a block boundary.
4738 */
4739 if (sb->s_blocksize - offset < len) {
4740 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4741 " cancelled because not block aligned",
4742 (unsigned long long)off, (unsigned long long)len);
4743 return -EIO;
4744 }
4745
ac27a0ec 4746 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4747 bh = ext4_bread(handle, inode, blk, 1, &err);
4748 if (!bh)
4749 goto out;
62d2b5f2
JK		 4750 err = ext4_journal_get_write_access(handle, bh);
4751 if (err) {
4752 brelse(bh);
4753 goto out;
ac27a0ec 4754 }
67eeb568
DM		 4755 lock_buffer(bh);
4756 memcpy(bh->b_data+offset, data, len);
4757 flush_dcache_page(bh->b_page);
4758 unlock_buffer(bh);
62d2b5f2 4759 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4760 brelse(bh);
ac27a0ec 4761out:
67eeb568 4762 if (err) {
4d04e4fb 4763 mutex_unlock(&inode->i_mutex);
ac27a0ec 4764 return err;
4d04e4fb 4765 }
67eeb568
DM		 4766 if (inode->i_size < off + len) {
4767 i_size_write(inode, off + len);
617ba13b 4768 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4769 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4770 }
ac27a0ec 4771 mutex_unlock(&inode->i_mutex);
67eeb568 4772 return len;
ac27a0ec
DK		 4773}
4774
4775#endif
4776
152a0836
AV		 4777static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4778 const char *dev_name, void *data)
ac27a0ec 4779{
152a0836 4780 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4781}
4782
37f328eb 4783#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4784static inline void register_as_ext2(void)
4785{
4786 int err = register_filesystem(&ext2_fs_type);
4787 if (err)
4788 printk(KERN_WARNING
4789 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4790}
4791
4792static inline void unregister_as_ext2(void)
4793{
4794 unregister_filesystem(&ext2_fs_type);
4795}
2035e776
TT		 4796
4797static inline int ext2_feature_set_ok(struct super_block *sb)
4798{
4799 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4800 return 0;
4801 if (sb->s_flags & MS_RDONLY)
4802 return 1;
4803 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4804 return 0;
4805 return 1;
4806}
51b7e3c9 4807MODULE_ALIAS("ext2");
24b58424
TT		 4808#else
4809static inline void register_as_ext2(void) { }
4810static inline void unregister_as_ext2(void) { }
2035e776 4811static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4812#endif
4813
37f328eb 4814#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4815static inline void register_as_ext3(void)
4816{
4817 int err = register_filesystem(&ext3_fs_type);
4818 if (err)
4819 printk(KERN_WARNING
4820 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4821}
4822
4823static inline void unregister_as_ext3(void)
4824{
4825 unregister_filesystem(&ext3_fs_type);
4826}
2035e776
TT		 4827
4828static inline int ext3_feature_set_ok(struct super_block *sb)
4829{
4830 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4831 return 0;
4832 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4833 return 0;
4834 if (sb->s_flags & MS_RDONLY)
4835 return 1;
4836 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4837 return 0;
4838 return 1;
4839}
51b7e3c9 4840MODULE_ALIAS("ext3");
24b58424
TT		 4841#else
4842static inline void register_as_ext3(void) { }
4843static inline void unregister_as_ext3(void) { }
2035e776 4844static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4845#endif
4846
03010a33
TT		 4847static struct file_system_type ext4_fs_type = {
4848 .owner = THIS_MODULE,
4849 .name = "ext4",
152a0836 4850 .mount = ext4_mount,
03010a33
TT		 4851 .kill_sb = kill_block_super,
4852 .fs_flags = FS_REQUIRES_DEV,
4853};
4854
8f021222 4855static int __init ext4_init_feat_adverts(void)
857ac889
LC		 4856{
4857 struct ext4_features *ef;
4858 int ret = -ENOMEM;
4859
4860 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4861 if (!ef)
4862 goto out;
4863
4864 ef->f_kobj.kset = ext4_kset;
4865 init_completion(&ef->f_kobj_unregister);
4866 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4867 "features");
4868 if (ret) {
4869 kfree(ef);
4870 goto out;
4871 }
4872
4873 ext4_feat = ef;
4874 ret = 0;
4875out:
4876 return ret;
4877}
4878
8f021222
LC		 4879static void ext4_exit_feat_adverts(void)
4880{
4881 kobject_put(&ext4_feat->f_kobj);
4882 wait_for_completion(&ext4_feat->f_kobj_unregister);
4883 kfree(ext4_feat);
4884}
4885
e9e3bcec
ES		 4886/* Shared across all ext4 file systems */
4887wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4888struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4889
5dabfc78 4890static int __init ext4_init_fs(void)
ac27a0ec 4891{
e9e3bcec 4892 int i, err;
c9de560d 4893
12e9b892 4894 ext4_check_flag_values();
e9e3bcec
ES		 4895
4896 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4897 mutex_init(&ext4__aio_mutex[i]);
4898 init_waitqueue_head(&ext4__ioend_wq[i]);
4899 }
4900
5dabfc78 4901 err = ext4_init_pageio();
6fd058f7
TT		 4902 if (err)
4903 return err;
5dabfc78 4904 err = ext4_init_system_zone();
bd2d0210 4905 if (err)
d44651d0 4906 goto out6;
3197ebdb
TT		 4907 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4908 if (!ext4_kset)
dd68314c 4909 goto out5;
d44651d0 4910 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 4911
4912 err = ext4_init_feat_adverts();
dd68314c
TT		 4913 if (err)
4914 goto out4;
857ac889 4915
5dabfc78 4916 err = ext4_init_mballoc();
ac27a0ec 4917 if (err)
6fd058f7 4918 goto out3;
c9de560d 4919
5dabfc78 4920 err = ext4_init_xattr();
c9de560d
AT		 4921 if (err)
4922 goto out2;
ac27a0ec
DK		 4923 err = init_inodecache();
4924 if (err)
4925 goto out1;
24b58424 4926 register_as_ext3();
2035e776 4927 register_as_ext2();
03010a33 4928 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4929 if (err)
4930 goto out;
bfff6873
LC		 4931
4932 ext4_li_info = NULL;
4933 mutex_init(&ext4_li_mtx);
ac27a0ec
DK		 4934 return 0;
4935out:
24b58424
TT		 4936 unregister_as_ext2();
4937 unregister_as_ext3();
ac27a0ec
DK		 4938 destroy_inodecache();
4939out1:
5dabfc78 4940 ext4_exit_xattr();
c9de560d 4941out2:
5dabfc78 4942 ext4_exit_mballoc();
6fd058f7 4943out3:
8f021222 4944 ext4_exit_feat_adverts();
dd68314c 4945out4:
d44651d0
FJ		 4946 if (ext4_proc_root)
4947 remove_proc_entry("fs/ext4", NULL);
6fd058f7 4948 kset_unregister(ext4_kset);
d44651d0 4949out5:
5dabfc78 4950 ext4_exit_system_zone();
d44651d0 4951out6:
5dabfc78 4952 ext4_exit_pageio();
ac27a0ec
DK		 4953 return err;
4954}
4955
5dabfc78 4956static void __exit ext4_exit_fs(void)
ac27a0ec 4957{
bfff6873 4958 ext4_destroy_lazyinit_thread();
24b58424
TT		 4959 unregister_as_ext2();
4960 unregister_as_ext3();
03010a33 4961 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4962 destroy_inodecache();
5dabfc78
TT		 4963 ext4_exit_xattr();
4964 ext4_exit_mballoc();
8f021222 4965 ext4_exit_feat_adverts();
9f6200bb 4966 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4967 kset_unregister(ext4_kset);
5dabfc78
TT		 4968 ext4_exit_system_zone();
4969 ext4_exit_pageio();
ac27a0ec
DK		 4970}
4971
4972MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4973MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4974MODULE_LICENSE("GPL");
5dabfc78
TT		 4975module_init(ext4_init_fs)
4976module_exit(ext4_exit_fs)
kernel source for telekom puls (alcatel/mediatek)