projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ext4: avoid duplicate writes of the backup bg descriptor blocks
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
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);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
109#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110#else
111#define IS_EXT3_SB(sb) (0)
112#endif
bd81d8ee 113
d25425f8
DW		 114static int ext4_verify_csum_type(struct super_block *sb,
115 struct ext4_super_block *es)
116{
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
119 return 1;
120
121 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
122}
123
a9c47317
DW		 124static __le32 ext4_superblock_csum(struct super_block *sb,
125 struct ext4_super_block *es)
126{
127 struct ext4_sb_info *sbi = EXT4_SB(sb);
128 int offset = offsetof(struct ext4_super_block, s_checksum);
129 __u32 csum;
130
131 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
132
133 return cpu_to_le32(csum);
134}
135
136int ext4_superblock_csum_verify(struct super_block *sb,
137 struct ext4_super_block *es)
138{
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
141 return 1;
142
143 return es->s_checksum == ext4_superblock_csum(sb, es);
144}
145
146void ext4_superblock_csum_set(struct super_block *sb,
147 struct ext4_super_block *es)
148{
149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
150 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
151 return;
152
153 es->s_checksum = ext4_superblock_csum(sb, es);
154}
155
9933fc0a
TT		 156void *ext4_kvmalloc(size_t size, gfp_t flags)
157{
158 void *ret;
159
160 ret = kmalloc(size, flags);
161 if (!ret)
162 ret = __vmalloc(size, flags, PAGE_KERNEL);
163 return ret;
164}
165
166void *ext4_kvzalloc(size_t size, gfp_t flags)
167{
168 void *ret;
169
db9481c0 170 ret = kzalloc(size, flags);
9933fc0a
TT		 171 if (!ret)
172 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
173 return ret;
174}
175
176void ext4_kvfree(void *ptr)
177{
178 if (is_vmalloc_addr(ptr))
179 vfree(ptr);
180 else
181 kfree(ptr);
182
183}
184
8fadc143
AR		 185ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
186 struct ext4_group_desc *bg)
bd81d8ee 187{
3a14589c 188 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 189 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 190 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 191}
192
8fadc143
AR		 193ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
194 struct ext4_group_desc *bg)
bd81d8ee 195{
5272f837 196 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 197 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 198 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 199}
200
8fadc143
AR		 201ext4_fsblk_t ext4_inode_table(struct super_block *sb,
202 struct ext4_group_desc *bg)
bd81d8ee 203{
5272f837 204 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 206 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 207}
208
021b65bb
TT		 209__u32 ext4_free_group_clusters(struct super_block *sb,
210 struct ext4_group_desc *bg)
560671a0
AK		 211{
212 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 214 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 215}
216
217__u32 ext4_free_inodes_count(struct super_block *sb,
218 struct ext4_group_desc *bg)
219{
220 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 222 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 223}
224
225__u32 ext4_used_dirs_count(struct super_block *sb,
226 struct ext4_group_desc *bg)
227{
228 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 230 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 231}
232
233__u32 ext4_itable_unused_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235{
236 return le16_to_cpu(bg->bg_itable_unused_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 238 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 239}
240
8fadc143
AR		 241void ext4_block_bitmap_set(struct super_block *sb,
242 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 243{
3a14589c 244 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 245 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
246 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 247}
248
8fadc143
AR		 249void ext4_inode_bitmap_set(struct super_block *sb,
250 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 251{
5272f837 252 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 253 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
254 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 255}
256
8fadc143
AR		 257void ext4_inode_table_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 259{
5272f837 260 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 263}
264
021b65bb
TT		 265void ext4_free_group_clusters_set(struct super_block *sb,
266 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 267{
268 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
271}
272
273void ext4_free_inodes_set(struct super_block *sb,
274 struct ext4_group_desc *bg, __u32 count)
275{
276 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
279}
280
281void ext4_used_dirs_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
283{
284 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
287}
288
289void ext4_itable_unused_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291{
292 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
295}
296
d3d1faf6
CW		 297
298/* Just increment the non-pointer handle value */
299static handle_t *ext4_get_nojournal(void)
300{
301 handle_t *handle = current->journal_info;
302 unsigned long ref_cnt = (unsigned long)handle;
303
304 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
305
306 ref_cnt++;
307 handle = (handle_t *)ref_cnt;
308
309 current->journal_info = handle;
310 return handle;
311}
312
313
314/* Decrement the non-pointer handle value */
315static void ext4_put_nojournal(handle_t *handle)
316{
317 unsigned long ref_cnt = (unsigned long)handle;
318
319 BUG_ON(ref_cnt == 0);
320
321 ref_cnt--;
322 handle = (handle_t *)ref_cnt;
323
324 current->journal_info = handle;
325}
326
ac27a0ec 327/*
dab291af 328 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 329 *
330 * The only special thing we need to do here is to make sure that all
331 * journal_end calls result in the superblock being marked dirty, so
332 * that sync() will call the filesystem's write_super callback if
333 * appropriate.
334 */
617ba13b 335handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 336{
337 journal_t *journal;
338
12706394 339 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 340 if (sb->s_flags & MS_RDONLY)
341 return ERR_PTR(-EROFS);
342
8e8ad8a5 343 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
617ba13b 344 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 345 if (!journal)
346 return ext4_get_nojournal();
347 /*
348 * Special case here: if the journal has aborted behind our
349 * backs (eg. EIO in the commit thread), then we still need to
350 * take the FS itself readonly cleanly.
351 */
352 if (is_journal_aborted(journal)) {
353 ext4_abort(sb, "Detected aborted journal");
354 return ERR_PTR(-EROFS);
ac27a0ec 355 }
be4f27d3 356 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 357}
358
359/*
360 * The only special thing we need to do here is to make sure that all
dab291af 361 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 362 * that sync() will call the filesystem's write_super callback if
363 * appropriate.
364 */
c398eda0 365int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 366{
367 struct super_block *sb;
368 int err;
369 int rc;
370
0390131b 371 if (!ext4_handle_valid(handle)) {
d3d1faf6 372 ext4_put_nojournal(handle);
0390131b
FM		 373 return 0;
374 }
ac27a0ec
DK		 375 sb = handle->h_transaction->t_journal->j_private;
376 err = handle->h_err;
dab291af 377 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 378
379 if (!err)
380 err = rc;
381 if (err)
c398eda0 382 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 383 return err;
384}
385
90c7201b
TT		 386void ext4_journal_abort_handle(const char *caller, unsigned int line,
387 const char *err_fn, struct buffer_head *bh,
388 handle_t *handle, int err)
ac27a0ec
DK		 389{
390 char nbuf[16];
617ba13b 391 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 392
0390131b
FM		 393 BUG_ON(!ext4_handle_valid(handle));
394
ac27a0ec
DK		 395 if (bh)
396 BUFFER_TRACE(bh, "abort");
397
398 if (!handle->h_err)
399 handle->h_err = err;
400
401 if (is_handle_aborted(handle))
402 return;
403
92b97816 404 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 405 caller, line, errstr, err_fn);
ac27a0ec 406
dab291af 407 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 408}
409
1c13d5c0
TT		 410static void __save_error_info(struct super_block *sb, const char *func,
411 unsigned int line)
412{
413 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
414
415 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
416 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
417 es->s_last_error_time = cpu_to_le32(get_seconds());
418 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
419 es->s_last_error_line = cpu_to_le32(line);
420 if (!es->s_first_error_time) {
421 es->s_first_error_time = es->s_last_error_time;
422 strncpy(es->s_first_error_func, func,
423 sizeof(es->s_first_error_func));
424 es->s_first_error_line = cpu_to_le32(line);
425 es->s_first_error_ino = es->s_last_error_ino;
426 es->s_first_error_block = es->s_last_error_block;
427 }
66e61a9e
TT		 428 /*
429 * Start the daily error reporting function if it hasn't been
430 * started already
431 */
432 if (!es->s_error_count)
433 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 434 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
435}
436
437static void save_error_info(struct super_block *sb, const char *func,
438 unsigned int line)
439{
440 __save_error_info(sb, func, line);
441 ext4_commit_super(sb, 1);
442}
443
7c2e7087
TT		 444/*
445 * The del_gendisk() function uninitializes the disk-specific data
446 * structures, including the bdi structure, without telling anyone
447 * else. Once this happens, any attempt to call mark_buffer_dirty()
448 * (for example, by ext4_commit_super), will cause a kernel OOPS.
449 * This is a kludge to prevent these oops until we can put in a proper
450 * hook in del_gendisk() to inform the VFS and file system layers.
451 */
452static int block_device_ejected(struct super_block *sb)
453{
454 struct inode *bd_inode = sb->s_bdev->bd_inode;
455 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
456
457 return bdi->dev == NULL;
458}
459
18aadd47
BJ		 460static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
461{
462 struct super_block *sb = journal->j_private;
463 struct ext4_sb_info *sbi = EXT4_SB(sb);
464 int error = is_journal_aborted(journal);
465 struct ext4_journal_cb_entry *jce, *tmp;
466
467 spin_lock(&sbi->s_md_lock);
468 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
469 list_del_init(&jce->jce_list);
470 spin_unlock(&sbi->s_md_lock);
471 jce->jce_func(sb, jce, error);
472 spin_lock(&sbi->s_md_lock);
473 }
474 spin_unlock(&sbi->s_md_lock);
475}
1c13d5c0 476
ac27a0ec
DK		 477/* Deal with the reporting of failure conditions on a filesystem such as
478 * inconsistencies detected or read IO failures.
479 *
480 * On ext2, we can store the error state of the filesystem in the
617ba13b 481 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 482 * write ordering constraints on the superblock which prevent us from
483 * writing it out straight away; and given that the journal is about to
484 * be aborted, we can't rely on the current, or future, transactions to
485 * write out the superblock safely.
486 *
dab291af 487 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 488 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 489 * that error until we've noted it down and cleared it.
490 */
491
617ba13b 492static void ext4_handle_error(struct super_block *sb)
ac27a0ec 493{
ac27a0ec
DK		 494 if (sb->s_flags & MS_RDONLY)
495 return;
496
2b2d6d01 497 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 498 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 499
4ab2f15b 500 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 501 if (journal)
dab291af 502 jbd2_journal_abort(journal, -EIO);
ac27a0ec 503 }
2b2d6d01 504 if (test_opt(sb, ERRORS_RO)) {
b31e1552 505 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 506 sb->s_flags |= MS_RDONLY;
507 }
ac27a0ec 508 if (test_opt(sb, ERRORS_PANIC))
617ba13b 509 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 510 sb->s_id);
511}
512
12062ddd 513void __ext4_error(struct super_block *sb, const char *function,
c398eda0 514 unsigned int line, const char *fmt, ...)
ac27a0ec 515{
0ff2ea7d 516 struct va_format vaf;
ac27a0ec
DK		 517 va_list args;
518
519 va_start(args, fmt);
0ff2ea7d
JP		 520 vaf.fmt = fmt;
521 vaf.va = &args;
522 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
523 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 524 va_end(args);
f3fc0210 525 save_error_info(sb, function, line);
ac27a0ec 526
617ba13b 527 ext4_handle_error(sb);
ac27a0ec
DK		 528}
529
c398eda0
TT		 530void ext4_error_inode(struct inode *inode, const char *function,
531 unsigned int line, ext4_fsblk_t block,
273df556
FM		 532 const char *fmt, ...)
533{
534 va_list args;
f7c21177 535 struct va_format vaf;
1c13d5c0 536 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 537
1c13d5c0
TT		 538 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
539 es->s_last_error_block = cpu_to_le64(block);
540 save_error_info(inode->i_sb, function, line);
273df556 541 va_start(args, fmt);
f7c21177
TT		 542 vaf.fmt = fmt;
543 vaf.va = &args;
c398eda0 544 if (block)
d9ee81da
JP		 545 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
546 "inode #%lu: block %llu: comm %s: %pV\n",
547 inode->i_sb->s_id, function, line, inode->i_ino,
548 block, current->comm, &vaf);
549 else
550 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
551 "inode #%lu: comm %s: %pV\n",
552 inode->i_sb->s_id, function, line, inode->i_ino,
553 current->comm, &vaf);
273df556
FM		 554 va_end(args);
555
556 ext4_handle_error(inode->i_sb);
557}
558
c398eda0 559void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 560 unsigned int line, ext4_fsblk_t block,
561 const char *fmt, ...)
273df556
FM		 562{
563 va_list args;
f7c21177 564 struct va_format vaf;
1c13d5c0 565 struct ext4_super_block *es;
273df556
FM		 566 struct inode *inode = file->f_dentry->d_inode;
567 char pathname[80], *path;
568
1c13d5c0
TT		 569 es = EXT4_SB(inode->i_sb)->s_es;
570 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
571 save_error_info(inode->i_sb, function, line);
273df556 572 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 573 if (IS_ERR(path))
273df556 574 path = "(unknown)";
f7c21177
TT		 575 va_start(args, fmt);
576 vaf.fmt = fmt;
577 vaf.va = &args;
d9ee81da
JP		 578 if (block)
579 printk(KERN_CRIT
580 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
581 "block %llu: comm %s: path %s: %pV\n",
582 inode->i_sb->s_id, function, line, inode->i_ino,
583 block, current->comm, path, &vaf);
584 else
585 printk(KERN_CRIT
586 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
587 "comm %s: path %s: %pV\n",
588 inode->i_sb->s_id, function, line, inode->i_ino,
589 current->comm, path, &vaf);
273df556
FM		 590 va_end(args);
591
592 ext4_handle_error(inode->i_sb);
593}
594
2b2d6d01 595static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 596 char nbuf[16])
597{
598 char *errstr = NULL;
599
600 switch (errno) {
601 case -EIO:
602 errstr = "IO failure";
603 break;
604 case -ENOMEM:
605 errstr = "Out of memory";
606 break;
607 case -EROFS:
78f1ddbb
TT		 608 if (!sb || (EXT4_SB(sb)->s_journal &&
609 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 610 errstr = "Journal has aborted";
611 else
612 errstr = "Readonly filesystem";
613 break;
614 default:
615 /* If the caller passed in an extra buffer for unknown
616 * errors, textualise them now. Else we just return
617 * NULL. */
618 if (nbuf) {
619 /* Check for truncated error codes... */
620 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
621 errstr = nbuf;
622 }
623 break;
624 }
625
626 return errstr;
627}
628
617ba13b 629/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 630 * automatically and invokes the appropriate error response. */
631
c398eda0
TT		 632void __ext4_std_error(struct super_block *sb, const char *function,
633 unsigned int line, int errno)
ac27a0ec
DK		 634{
635 char nbuf[16];
636 const char *errstr;
637
638 /* Special case: if the error is EROFS, and we're not already
639 * inside a transaction, then there's really no point in logging
640 * an error. */
641 if (errno == -EROFS && journal_current_handle() == NULL &&
642 (sb->s_flags & MS_RDONLY))
643 return;
644
617ba13b 645 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 646 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
647 sb->s_id, function, line, errstr);
1c13d5c0 648 save_error_info(sb, function, line);
ac27a0ec 649
617ba13b 650 ext4_handle_error(sb);
ac27a0ec
DK		 651}
652
653/*
617ba13b 654 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 655 * abort function may be used to deal with unrecoverable failures such
656 * as journal IO errors or ENOMEM at a critical moment in log management.
657 *
658 * We unconditionally force the filesystem into an ABORT|READONLY state,
659 * unless the error response on the fs has been set to panic in which
660 * case we take the easy way out and panic immediately.
661 */
662
c67d859e 663void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 664 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 665{
666 va_list args;
667
1c13d5c0 668 save_error_info(sb, function, line);
ac27a0ec 669 va_start(args, fmt);
c398eda0
TT		 670 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
671 function, line);
ac27a0ec
DK		 672 vprintk(fmt, args);
673 printk("\n");
674 va_end(args);
675
1c13d5c0
TT		 676 if ((sb->s_flags & MS_RDONLY) == 0) {
677 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
678 sb->s_flags |= MS_RDONLY;
679 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
680 if (EXT4_SB(sb)->s_journal)
681 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
682 save_error_info(sb, function, line);
683 }
ac27a0ec 684 if (test_opt(sb, ERRORS_PANIC))
617ba13b 685 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 686}
687
0ff2ea7d 688void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 689{
0ff2ea7d 690 struct va_format vaf;
b31e1552
ES		 691 va_list args;
692
693 va_start(args, fmt);
0ff2ea7d
JP		 694 vaf.fmt = fmt;
695 vaf.va = &args;
696 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 697 va_end(args);
698}
699
12062ddd 700void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 701 unsigned int line, const char *fmt, ...)
ac27a0ec 702{
0ff2ea7d 703 struct va_format vaf;
ac27a0ec
DK		 704 va_list args;
705
706 va_start(args, fmt);
0ff2ea7d
JP		 707 vaf.fmt = fmt;
708 vaf.va = &args;
709 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
710 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 711 va_end(args);
712}
713
e29136f8
TT		 714void __ext4_grp_locked_error(const char *function, unsigned int line,
715 struct super_block *sb, ext4_group_t grp,
716 unsigned long ino, ext4_fsblk_t block,
717 const char *fmt, ...)
5d1b1b3f
AK		 718__releases(bitlock)
719__acquires(bitlock)
720{
0ff2ea7d 721 struct va_format vaf;
5d1b1b3f
AK		 722 va_list args;
723 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
724
1c13d5c0
TT		 725 es->s_last_error_ino = cpu_to_le32(ino);
726 es->s_last_error_block = cpu_to_le64(block);
727 __save_error_info(sb, function, line);
0ff2ea7d 728
5d1b1b3f 729 va_start(args, fmt);
0ff2ea7d
JP		 730
731 vaf.fmt = fmt;
732 vaf.va = &args;
21149d61 733 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 734 sb->s_id, function, line, grp);
735 if (ino)
0ff2ea7d 736 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 737 if (block)
0ff2ea7d
JP		 738 printk(KERN_CONT "block %llu:", (unsigned long long) block);
739 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 740 va_end(args);
741
742 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 743 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 744 return;
745 }
1c13d5c0 746
5d1b1b3f
AK		 747 ext4_unlock_group(sb, grp);
748 ext4_handle_error(sb);
749 /*
750 * We only get here in the ERRORS_RO case; relocking the group
751 * may be dangerous, but nothing bad will happen since the
752 * filesystem will have already been marked read/only and the
753 * journal has been aborted. We return 1 as a hint to callers
754 * who might what to use the return value from
25985edc 755 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 756 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
757 * aggressively from the ext4 function in question, with a
758 * more appropriate error code.
759 */
760 ext4_lock_group(sb, grp);
761 return;
762}
763
617ba13b 764void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 765{
617ba13b 766 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 767
617ba13b 768 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 769 return;
770
12062ddd 771 ext4_warning(sb,
ac27a0ec
DK		 772 "updating to rev %d because of new feature flag, "
773 "running e2fsck is recommended",
617ba13b 774 EXT4_DYNAMIC_REV);
ac27a0ec 775
617ba13b
MC		 776 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
777 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
778 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 779 /* leave es->s_feature_*compat flags alone */
780 /* es->s_uuid will be set by e2fsck if empty */
781
782 /*
783 * The rest of the superblock fields should be zero, and if not it
784 * means they are likely already in use, so leave them alone. We
785 * can leave it up to e2fsck to clean up any inconsistencies there.
786 */
787}
788
789/*
790 * Open the external journal device
791 */
b31e1552 792static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 793{
794 struct block_device *bdev;
795 char b[BDEVNAME_SIZE];
796
d4d77629 797 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 798 if (IS_ERR(bdev))
799 goto fail;
800 return bdev;
801
802fail:
b31e1552 803 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 804 __bdevname(dev, b), PTR_ERR(bdev));
805 return NULL;
806}
807
808/*
809 * Release the journal device
810 */
617ba13b 811static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 812{
e525fd89 813 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 814}
815
617ba13b 816static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 817{
818 struct block_device *bdev;
819 int ret = -ENODEV;
820
821 bdev = sbi->journal_bdev;
822 if (bdev) {
617ba13b 823 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 824 sbi->journal_bdev = NULL;
825 }
826 return ret;
827}
828
829static inline struct inode *orphan_list_entry(struct list_head *l)
830{
617ba13b 831 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 832}
833
617ba13b 834static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 835{
836 struct list_head *l;
837
b31e1552
ES		 838 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
839 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 840
841 printk(KERN_ERR "sb_info orphan list:\n");
842 list_for_each(l, &sbi->s_orphan) {
843 struct inode *inode = orphan_list_entry(l);
844 printk(KERN_ERR " "
845 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
846 inode->i_sb->s_id, inode->i_ino, inode,
847 inode->i_mode, inode->i_nlink,
848 NEXT_ORPHAN(inode));
849 }
850}
851
2b2d6d01 852static void ext4_put_super(struct super_block *sb)
ac27a0ec 853{
617ba13b
MC		 854 struct ext4_sb_info *sbi = EXT4_SB(sb);
855 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 856 int i, err;
ac27a0ec 857
857ac889 858 ext4_unregister_li_request(sb);
e0ccfd95
CH		 859 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
860
4c0425ff
MC		 861 flush_workqueue(sbi->dio_unwritten_wq);
862 destroy_workqueue(sbi->dio_unwritten_wq);
863
0390131b
FM		 864 if (sbi->s_journal) {
865 err = jbd2_journal_destroy(sbi->s_journal);
866 sbi->s_journal = NULL;
867 if (err < 0)
c67d859e 868 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 869 }
d4edac31 870
a1c6c569 871 del_timer(&sbi->s_err_report);
d4edac31
JB		 872 ext4_release_system_zone(sb);
873 ext4_mb_release(sb);
874 ext4_ext_release(sb);
875 ext4_xattr_put_super(sb);
876
ac27a0ec 877 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 878 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 879 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 880 }
58c5873a 881 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 882 ext4_commit_super(sb, 1);
883
240799cd 884 if (sbi->s_proc) {
66acdcf4 885 remove_proc_entry("options", sbi->s_proc);
9f6200bb 886 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 887 }
3197ebdb 888 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 889
890 for (i = 0; i < sbi->s_gdb_count; i++)
891 brelse(sbi->s_group_desc[i]);
f18a5f21 892 ext4_kvfree(sbi->s_group_desc);
9933fc0a 893 ext4_kvfree(sbi->s_flex_groups);
57042651 894 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 895 percpu_counter_destroy(&sbi->s_freeinodes_counter);
896 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 897 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 898 brelse(sbi->s_sbh);
899#ifdef CONFIG_QUOTA
900 for (i = 0; i < MAXQUOTAS; i++)
901 kfree(sbi->s_qf_names[i]);
902#endif
903
904 /* Debugging code just in case the in-memory inode orphan list
905 * isn't empty. The on-disk one can be non-empty if we've
906 * detected an error and taken the fs readonly, but the
907 * in-memory list had better be clean by this point. */
908 if (!list_empty(&sbi->s_orphan))
909 dump_orphan_list(sb, sbi);
910 J_ASSERT(list_empty(&sbi->s_orphan));
911
f98393a6 912 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 913 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
914 /*
915 * Invalidate the journal device's buffers. We don't want them
916 * floating about in memory - the physical journal device may
917 * hotswapped, and it breaks the `ro-after' testing code.
918 */
919 sync_blockdev(sbi->journal_bdev);
f98393a6 920 invalidate_bdev(sbi->journal_bdev);
617ba13b 921 ext4_blkdev_remove(sbi);
ac27a0ec 922 }
c5e06d10
JL		 923 if (sbi->s_mmp_tsk)
924 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 925 sb->s_fs_info = NULL;
3197ebdb
TT		 926 /*
927 * Now that we are completely done shutting down the
928 * superblock, we need to actually destroy the kobject.
929 */
3197ebdb
TT		 930 kobject_put(&sbi->s_kobj);
931 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 932 if (sbi->s_chksum_driver)
933 crypto_free_shash(sbi->s_chksum_driver);
705895b6 934 kfree(sbi->s_blockgroup_lock);
ac27a0ec 935 kfree(sbi);
ac27a0ec
DK		 936}
937
e18b890b 938static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 939
940/*
941 * Called inside transaction, so use GFP_NOFS
942 */
617ba13b 943static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 944{
617ba13b 945 struct ext4_inode_info *ei;
ac27a0ec 946
e6b4f8da 947 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 948 if (!ei)
949 return NULL;
0b8e58a1 950
ac27a0ec 951 ei->vfs_inode.i_version = 1;
91246c00 952 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 953 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 954 INIT_LIST_HEAD(&ei->i_prealloc_list);
955 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 956 ei->i_reserved_data_blocks = 0;
957 ei->i_reserved_meta_blocks = 0;
958 ei->i_allocated_meta_blocks = 0;
9d0be502 959 ei->i_da_metadata_calc_len = 0;
7e731bc9 960 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 961 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 962#ifdef CONFIG_QUOTA
963 ei->i_reserved_quota = 0;
964#endif
8aefcd55 965 ei->jinode = NULL;
c7064ef1 966 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 967 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 968 ei->cur_aio_dio = NULL;
b436b9be
JK		 969 ei->i_sync_tid = 0;
970 ei->i_datasync_tid = 0;
f7ad6d2e 971 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 972 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 973
ac27a0ec
DK		 974 return &ei->vfs_inode;
975}
976
7ff9c073
TT		 977static int ext4_drop_inode(struct inode *inode)
978{
979 int drop = generic_drop_inode(inode);
980
981 trace_ext4_drop_inode(inode, drop);
982 return drop;
983}
984
fa0d7e3d
NP		 985static void ext4_i_callback(struct rcu_head *head)
986{
987 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 988 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
989}
990
617ba13b 991static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 992{
9f7dd93d 993 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 994 ext4_msg(inode->i_sb, KERN_ERR,
995 "Inode %lu (%p): orphan list check failed!",
996 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 997 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
998 EXT4_I(inode), sizeof(struct ext4_inode_info),
999 true);
1000 dump_stack();
1001 }
fa0d7e3d 1002 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1003}
1004
51cc5068 1005static void init_once(void *foo)
ac27a0ec 1006{
617ba13b 1007 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1008
a35afb83 1009 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 1010#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 1011 init_rwsem(&ei->xattr_sem);
ac27a0ec 1012#endif
0e855ac8 1013 init_rwsem(&ei->i_data_sem);
a35afb83 1014 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1015}
1016
1017static int init_inodecache(void)
1018{
617ba13b
MC		 1019 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1020 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 1021 0, (SLAB_RECLAIM_ACCOUNT|
1022 SLAB_MEM_SPREAD),
20c2df83 1023 init_once);
617ba13b 1024 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1025 return -ENOMEM;
1026 return 0;
1027}
1028
1029static void destroy_inodecache(void)
1030{
617ba13b 1031 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1032}
1033
0930fcc1 1034void ext4_clear_inode(struct inode *inode)
ac27a0ec 1035{
0930fcc1 1036 invalidate_inode_buffers(inode);
dbd5768f 1037 clear_inode(inode);
9f754758 1038 dquot_drop(inode);
c2ea3fde 1039 ext4_discard_preallocations(inode);
8aefcd55
TT		 1040 if (EXT4_I(inode)->jinode) {
1041 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1042 EXT4_I(inode)->jinode);
1043 jbd2_free_inode(EXT4_I(inode)->jinode);
1044 EXT4_I(inode)->jinode = NULL;
1045 }
ac27a0ec
DK		 1046}
1047
1b961ac0 1048static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1049 u64 ino, u32 generation)
ac27a0ec 1050{
ac27a0ec 1051 struct inode *inode;
ac27a0ec 1052
617ba13b 1053 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1054 return ERR_PTR(-ESTALE);
617ba13b 1055 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1056 return ERR_PTR(-ESTALE);
1057
1058 /* iget isn't really right if the inode is currently unallocated!!
1059 *
617ba13b 1060 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1061 * deleted, so we should be safe.
1062 *
1063 * Currently we don't know the generation for parent directory, so
1064 * a generation of 0 means "accept any"
1065 */
1d1fe1ee
DH		 1066 inode = ext4_iget(sb, ino);
1067 if (IS_ERR(inode))
1068 return ERR_CAST(inode);
1069 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1070 iput(inode);
1071 return ERR_PTR(-ESTALE);
1072 }
1b961ac0
CH		 1073
1074 return inode;
1075}
1076
1077static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1078 int fh_len, int fh_type)
1b961ac0
CH		 1079{
1080 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1081 ext4_nfs_get_inode);
1082}
1083
1084static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1085 int fh_len, int fh_type)
1b961ac0
CH		 1086{
1087 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1088 ext4_nfs_get_inode);
ac27a0ec
DK		 1089}
1090
c39a7f84
TO		 1091/*
1092 * Try to release metadata pages (indirect blocks, directories) which are
1093 * mapped via the block device. Since these pages could have journal heads
1094 * which would prevent try_to_free_buffers() from freeing them, we must use
1095 * jbd2 layer's try_to_free_buffers() function to release them.
1096 */
0b8e58a1
AD		 1097static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1098 gfp_t wait)
c39a7f84
TO		 1099{
1100 journal_t *journal = EXT4_SB(sb)->s_journal;
1101
1102 WARN_ON(PageChecked(page));
1103 if (!page_has_buffers(page))
1104 return 0;
1105 if (journal)
1106 return jbd2_journal_try_to_free_buffers(journal, page,
1107 wait & ~__GFP_WAIT);
1108 return try_to_free_buffers(page);
1109}
1110
ac27a0ec 1111#ifdef CONFIG_QUOTA
af5bc92d 1112#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1113#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1114
617ba13b
MC		 1115static int ext4_write_dquot(struct dquot *dquot);
1116static int ext4_acquire_dquot(struct dquot *dquot);
1117static int ext4_release_dquot(struct dquot *dquot);
1118static int ext4_mark_dquot_dirty(struct dquot *dquot);
1119static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1120static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1121 struct path *path);
7c319d32
AK		 1122static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1123 int format_id);
ca0e05e4 1124static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1125static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1126static int ext4_quota_on_mount(struct super_block *sb, int type);
1127static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1128 size_t len, loff_t off);
617ba13b 1129static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1130 const char *data, size_t len, loff_t off);
7c319d32
AK		 1131static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1132 unsigned int flags);
1133static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1134
61e225dc 1135static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1136 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1137 .write_dquot = ext4_write_dquot,
1138 .acquire_dquot = ext4_acquire_dquot,
1139 .release_dquot = ext4_release_dquot,
1140 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1141 .write_info = ext4_write_info,
1142 .alloc_dquot = dquot_alloc,
1143 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1144};
1145
0d54b217 1146static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1147 .quota_on = ext4_quota_on,
ca0e05e4 1148 .quota_off = ext4_quota_off,
287a8095
CH		 1149 .quota_sync = dquot_quota_sync,
1150 .get_info = dquot_get_dqinfo,
1151 .set_info = dquot_set_dqinfo,
1152 .get_dqblk = dquot_get_dqblk,
1153 .set_dqblk = dquot_set_dqblk
ac27a0ec 1154};
7c319d32
AK		 1155
1156static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1157 .quota_on_meta = ext4_quota_on_sysfile,
1158 .quota_off = ext4_quota_off_sysfile,
1159 .quota_sync = dquot_quota_sync,
1160 .get_info = dquot_get_dqinfo,
1161 .set_info = dquot_set_dqinfo,
1162 .get_dqblk = dquot_get_dqblk,
1163 .set_dqblk = dquot_set_dqblk
1164};
ac27a0ec
DK		 1165#endif
1166
ee9b6d61 1167static const struct super_operations ext4_sops = {
617ba13b
MC		 1168 .alloc_inode = ext4_alloc_inode,
1169 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1170 .write_inode = ext4_write_inode,
1171 .dirty_inode = ext4_dirty_inode,
7ff9c073 1172 .drop_inode = ext4_drop_inode,
0930fcc1 1173 .evict_inode = ext4_evict_inode,
617ba13b 1174 .put_super = ext4_put_super,
617ba13b 1175 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1176 .freeze_fs = ext4_freeze,
1177 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1178 .statfs = ext4_statfs,
1179 .remount_fs = ext4_remount,
617ba13b 1180 .show_options = ext4_show_options,
ac27a0ec 1181#ifdef CONFIG_QUOTA
617ba13b
MC		 1182 .quota_read = ext4_quota_read,
1183 .quota_write = ext4_quota_write,
ac27a0ec 1184#endif
c39a7f84 1185 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1186};
1187
9ca92389
TT		 1188static const struct super_operations ext4_nojournal_sops = {
1189 .alloc_inode = ext4_alloc_inode,
1190 .destroy_inode = ext4_destroy_inode,
1191 .write_inode = ext4_write_inode,
1192 .dirty_inode = ext4_dirty_inode,
7ff9c073 1193 .drop_inode = ext4_drop_inode,
0930fcc1 1194 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1195 .put_super = ext4_put_super,
1196 .statfs = ext4_statfs,
1197 .remount_fs = ext4_remount,
9ca92389
TT		 1198 .show_options = ext4_show_options,
1199#ifdef CONFIG_QUOTA
1200 .quota_read = ext4_quota_read,
1201 .quota_write = ext4_quota_write,
1202#endif
1203 .bdev_try_to_free_page = bdev_try_to_free_page,
1204};
1205
39655164 1206static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1207 .fh_to_dentry = ext4_fh_to_dentry,
1208 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1209 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1210};
1211
1212enum {
1213 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1214 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1215 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1216 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1217 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1218 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1219 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1220 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1221 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1222 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1223 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1224 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1225 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1226 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1227 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1228 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1229 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1230 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1231 Opt_max_dir_size_kb,
ac27a0ec
DK		 1232};
1233
a447c093 1234static const match_table_t tokens = {
ac27a0ec
DK		 1235 {Opt_bsd_df, "bsddf"},
1236 {Opt_minix_df, "minixdf"},
1237 {Opt_grpid, "grpid"},
1238 {Opt_grpid, "bsdgroups"},
1239 {Opt_nogrpid, "nogrpid"},
1240 {Opt_nogrpid, "sysvgroups"},
1241 {Opt_resgid, "resgid=%u"},
1242 {Opt_resuid, "resuid=%u"},
1243 {Opt_sb, "sb=%u"},
1244 {Opt_err_cont, "errors=continue"},
1245 {Opt_err_panic, "errors=panic"},
1246 {Opt_err_ro, "errors=remount-ro"},
1247 {Opt_nouid32, "nouid32"},
ac27a0ec 1248 {Opt_debug, "debug"},
72578c33
TT		 1249 {Opt_removed, "oldalloc"},
1250 {Opt_removed, "orlov"},
ac27a0ec
DK		 1251 {Opt_user_xattr, "user_xattr"},
1252 {Opt_nouser_xattr, "nouser_xattr"},
1253 {Opt_acl, "acl"},
1254 {Opt_noacl, "noacl"},
e3bb52ae 1255 {Opt_noload, "norecovery"},
5a916be1 1256 {Opt_noload, "noload"},
72578c33
TT		 1257 {Opt_removed, "nobh"},
1258 {Opt_removed, "bh"},
ac27a0ec 1259 {Opt_commit, "commit=%u"},
30773840
TT		 1260 {Opt_min_batch_time, "min_batch_time=%u"},
1261 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1262 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1263 {Opt_journal_checksum, "journal_checksum"},
1264 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1265 {Opt_abort, "abort"},
1266 {Opt_data_journal, "data=journal"},
1267 {Opt_data_ordered, "data=ordered"},
1268 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1269 {Opt_data_err_abort, "data_err=abort"},
1270 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1271 {Opt_offusrjquota, "usrjquota="},
1272 {Opt_usrjquota, "usrjquota=%s"},
1273 {Opt_offgrpjquota, "grpjquota="},
1274 {Opt_grpjquota, "grpjquota=%s"},
1275 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1276 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1277 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1278 {Opt_grpquota, "grpquota"},
1279 {Opt_noquota, "noquota"},
1280 {Opt_quota, "quota"},
1281 {Opt_usrquota, "usrquota"},
1282 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1283 {Opt_barrier, "barrier"},
1284 {Opt_nobarrier, "nobarrier"},
25ec56b5 1285 {Opt_i_version, "i_version"},
c9de560d 1286 {Opt_stripe, "stripe=%u"},
64769240 1287 {Opt_delalloc, "delalloc"},
dd919b98 1288 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1289 {Opt_mblk_io_submit, "mblk_io_submit"},
1290 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1291 {Opt_block_validity, "block_validity"},
1292 {Opt_noblock_validity, "noblock_validity"},
240799cd 1293 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1294 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1295 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1296 {Opt_auto_da_alloc, "auto_da_alloc"},
1297 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1298 {Opt_dioread_nolock, "dioread_nolock"},
1299 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1300 {Opt_discard, "discard"},
1301 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1302 {Opt_init_itable, "init_itable=%u"},
1303 {Opt_init_itable, "init_itable"},
1304 {Opt_noinit_itable, "noinit_itable"},
df981d03 1305 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1306 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1307 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1308 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1309 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1310 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1311 {Opt_err, NULL},
ac27a0ec
DK		 1312};
1313
617ba13b 1314static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1315{
617ba13b 1316 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1317 char *options = (char *) *data;
1318
1319 if (!options || strncmp(options, "sb=", 3) != 0)
1320 return 1; /* Default location */
0b8e58a1 1321
ac27a0ec 1322 options += 3;
0b8e58a1 1323 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1324 sb_block = simple_strtoul(options, &options, 0);
1325 if (*options && *options != ',') {
4776004f 1326 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1327 (char *) *data);
1328 return 1;
1329 }
1330 if (*options == ',')
1331 options++;
1332 *data = (void *) options;
0b8e58a1 1333
ac27a0ec
DK		 1334 return sb_block;
1335}
1336
b3881f74 1337#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1338static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1339 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1340
56c50f11
DM		 1341#ifdef CONFIG_QUOTA
1342static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1343{
1344 struct ext4_sb_info *sbi = EXT4_SB(sb);
1345 char *qname;
1346
1347 if (sb_any_quota_loaded(sb) &&
1348 !sbi->s_qf_names[qtype]) {
1349 ext4_msg(sb, KERN_ERR,
1350 "Cannot change journaled "
1351 "quota options when quota turned on");
57f73c2c 1352 return -1;
56c50f11
DM		 1353 }
1354 qname = match_strdup(args);
1355 if (!qname) {
1356 ext4_msg(sb, KERN_ERR,
1357 "Not enough memory for storing quotafile name");
57f73c2c 1358 return -1;
56c50f11
DM		 1359 }
1360 if (sbi->s_qf_names[qtype] &&
1361 strcmp(sbi->s_qf_names[qtype], qname)) {
1362 ext4_msg(sb, KERN_ERR,
1363 "%s quota file already specified", QTYPE2NAME(qtype));
1364 kfree(qname);
57f73c2c 1365 return -1;
56c50f11
DM		 1366 }
1367 sbi->s_qf_names[qtype] = qname;
1368 if (strchr(sbi->s_qf_names[qtype], '/')) {
1369 ext4_msg(sb, KERN_ERR,
1370 "quotafile must be on filesystem root");
1371 kfree(sbi->s_qf_names[qtype]);
1372 sbi->s_qf_names[qtype] = NULL;
57f73c2c 1373 return -1;
56c50f11 1374 }
fd8c37ec 1375 set_opt(sb, QUOTA);
56c50f11
DM		 1376 return 1;
1377}
1378
1379static int clear_qf_name(struct super_block *sb, int qtype)
1380{
1381
1382 struct ext4_sb_info *sbi = EXT4_SB(sb);
1383
1384 if (sb_any_quota_loaded(sb) &&
1385 sbi->s_qf_names[qtype]) {
1386 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1387 " when quota turned on");
57f73c2c 1388 return -1;
56c50f11
DM		 1389 }
1390 /*
1391 * The space will be released later when all options are confirmed
1392 * to be correct
1393 */
1394 sbi->s_qf_names[qtype] = NULL;
1395 return 1;
1396}
1397#endif
1398
26092bf5
TT		 1399#define MOPT_SET 0x0001
1400#define MOPT_CLEAR 0x0002
1401#define MOPT_NOSUPPORT 0x0004
1402#define MOPT_EXPLICIT 0x0008
1403#define MOPT_CLEAR_ERR 0x0010
1404#define MOPT_GTE0 0x0020
ac27a0ec 1405#ifdef CONFIG_QUOTA
26092bf5
TT		 1406#define MOPT_Q 0
1407#define MOPT_QFMT 0x0040
1408#else
1409#define MOPT_Q MOPT_NOSUPPORT
1410#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1411#endif
26092bf5
TT		 1412#define MOPT_DATAJ 0x0080
1413
1414static const struct mount_opts {
1415 int token;
1416 int mount_opt;
1417 int flags;
1418} ext4_mount_opts[] = {
1419 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1420 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1421 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1422 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1423 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1424 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1425 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1426 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1427 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1428 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1429 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1430 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1431 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1432 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1433 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1434 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1435 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1436 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1437 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1438 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1439 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1440 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1441 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1442 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1443 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1444 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1445 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1446 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1447 {Opt_commit, 0, MOPT_GTE0},
1448 {Opt_max_batch_time, 0, MOPT_GTE0},
1449 {Opt_min_batch_time, 0, MOPT_GTE0},
1450 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1451 {Opt_init_itable, 0, MOPT_GTE0},
1452 {Opt_stripe, 0, MOPT_GTE0},
1453 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1454 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1455 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1456#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1457 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1458 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1459#else
26092bf5
TT		 1460 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1461 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1462#endif
03010a33 1463#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1464 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1465 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1466#else
26092bf5
TT		 1467 {Opt_acl, 0, MOPT_NOSUPPORT},
1468 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1469#endif
26092bf5
TT		 1470 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1471 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1472 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1473 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1474 MOPT_SET | MOPT_Q},
1475 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1476 MOPT_SET | MOPT_Q},
1477 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1478 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1479 {Opt_usrjquota, 0, MOPT_Q},
1480 {Opt_grpjquota, 0, MOPT_Q},
1481 {Opt_offusrjquota, 0, MOPT_Q},
1482 {Opt_offgrpjquota, 0, MOPT_Q},
1483 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1484 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1485 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1486 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1487 {Opt_err, 0, 0}
1488};
1489
1490static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1491 substring_t *args, unsigned long *journal_devnum,
1492 unsigned int *journal_ioprio, int is_remount)
1493{
1494 struct ext4_sb_info *sbi = EXT4_SB(sb);
1495 const struct mount_opts *m;
08cefc7a
EB		 1496 kuid_t uid;
1497 kgid_t gid;
26092bf5
TT		 1498 int arg = 0;
1499
57f73c2c
TT		 1500#ifdef CONFIG_QUOTA
1501 if (token == Opt_usrjquota)
1502 return set_qf_name(sb, USRQUOTA, &args[0]);
1503 else if (token == Opt_grpjquota)
1504 return set_qf_name(sb, GRPQUOTA, &args[0]);
1505 else if (token == Opt_offusrjquota)
1506 return clear_qf_name(sb, USRQUOTA);
1507 else if (token == Opt_offgrpjquota)
1508 return clear_qf_name(sb, GRPQUOTA);
1509#endif
26092bf5
TT		 1510 if (args->from && match_int(args, &arg))
1511 return -1;
1512 switch (token) {
f7048605
TT		 1513 case Opt_noacl:
1514 case Opt_nouser_xattr:
1515 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1516 break;
26092bf5
TT		 1517 case Opt_sb:
1518 return 1; /* handled by get_sb_block() */
1519 case Opt_removed:
1520 ext4_msg(sb, KERN_WARNING,
1521 "Ignoring removed %s option", opt);
1522 return 1;
1523 case Opt_resuid:
08cefc7a
EB		 1524 uid = make_kuid(current_user_ns(), arg);
1525 if (!uid_valid(uid)) {
1526 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1527 return -1;
1528 }
1529 sbi->s_resuid = uid;
26092bf5
TT		 1530 return 1;
1531 case Opt_resgid:
08cefc7a
EB		 1532 gid = make_kgid(current_user_ns(), arg);
1533 if (!gid_valid(gid)) {
1534 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1535 return -1;
1536 }
1537 sbi->s_resgid = gid;
26092bf5
TT		 1538 return 1;
1539 case Opt_abort:
1540 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1541 return 1;
1542 case Opt_i_version:
1543 sb->s_flags |= MS_I_VERSION;
1544 return 1;
1545 case Opt_journal_dev:
1546 if (is_remount) {
1547 ext4_msg(sb, KERN_ERR,
1548 "Cannot specify journal on remount");
1549 return -1;
1550 }
1551 *journal_devnum = arg;
1552 return 1;
1553 case Opt_journal_ioprio:
1554 if (arg < 0 || arg > 7)
1555 return -1;
1556 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1557 return 1;
1558 }
1559
1560 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1561 if (token != m->token)
1562 continue;
1563 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1564 return -1;
1565 if (m->flags & MOPT_EXPLICIT)
1566 set_opt2(sb, EXPLICIT_DELALLOC);
1567 if (m->flags & MOPT_CLEAR_ERR)
1568 clear_opt(sb, ERRORS_MASK);
1569 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1570 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1571 "options when quota turned on");
1572 return -1;
1573 }
1574
1575 if (m->flags & MOPT_NOSUPPORT) {
1576 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1577 } else if (token == Opt_commit) {
1578 if (arg == 0)
1579 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1580 sbi->s_commit_interval = HZ * arg;
1581 } else if (token == Opt_max_batch_time) {
1582 if (arg == 0)
1583 arg = EXT4_DEF_MAX_BATCH_TIME;
1584 sbi->s_max_batch_time = arg;
1585 } else if (token == Opt_min_batch_time) {
1586 sbi->s_min_batch_time = arg;
1587 } else if (token == Opt_inode_readahead_blks) {
1588 if (arg > (1 << 30))
1589 return -1;
1590 if (arg && !is_power_of_2(arg)) {
b31e1552 1591 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1592 "EXT4-fs: inode_readahead_blks"
1593 " must be a power of 2");
1594 return -1;
ac27a0ec 1595 }
26092bf5
TT		 1596 sbi->s_inode_readahead_blks = arg;
1597 } else if (token == Opt_init_itable) {
1598 set_opt(sb, INIT_INODE_TABLE);
1599 if (!args->from)
1600 arg = EXT4_DEF_LI_WAIT_MULT;
1601 sbi->s_li_wait_mult = arg;
df981d03
TT		 1602 } else if (token == Opt_max_dir_size_kb) {
1603 sbi->s_max_dir_size_kb = arg;
26092bf5
TT		 1604 } else if (token == Opt_stripe) {
1605 sbi->s_stripe = arg;
1606 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1607 if (is_remount) {
eb513689
TT		 1608 if (!sbi->s_journal)
1609 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1610 else if (test_opt(sb, DATA_FLAGS) !=
1611 m->mount_opt) {
b31e1552 1612 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1613 "Cannot change data mode on remount");
1614 return -1;
ac27a0ec
DK		 1615 }
1616 } else {
fd8c37ec 1617 clear_opt(sb, DATA_FLAGS);
26092bf5 1618 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1619 }
ac27a0ec 1620#ifdef CONFIG_QUOTA
26092bf5 1621 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1622 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1623 sbi->s_jquota_fmt != m->mount_opt) {
1624 ext4_msg(sb, KERN_ERR, "Cannot "
1625 "change journaled quota options "
1626 "when quota turned on");
1627 return -1;
ac27a0ec 1628 }
26092bf5 1629 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1630#endif
26092bf5
TT		 1631 } else {
1632 if (!args->from)
1633 arg = 1;
1634 if (m->flags & MOPT_CLEAR)
1635 arg = !arg;
1636 else if (unlikely(!(m->flags & MOPT_SET))) {
1637 ext4_msg(sb, KERN_WARNING,
1638 "buggy handling of option %s", opt);
1639 WARN_ON(1);
1640 return -1;
3197ebdb 1641 }
26092bf5
TT		 1642 if (arg != 0)
1643 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1644 else
26092bf5 1645 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1646 }
26092bf5
TT		 1647 return 1;
1648 }
1649 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1650 "or missing value", opt);
1651 return -1;
1652}
1653
1654static int parse_options(char *options, struct super_block *sb,
1655 unsigned long *journal_devnum,
1656 unsigned int *journal_ioprio,
1657 int is_remount)
1658{
db7e5c66 1659#ifdef CONFIG_QUOTA
26092bf5 1660 struct ext4_sb_info *sbi = EXT4_SB(sb);
db7e5c66 1661#endif
26092bf5
TT		 1662 char *p;
1663 substring_t args[MAX_OPT_ARGS];
1664 int token;
1665
1666 if (!options)
1667 return 1;
1668
1669 while ((p = strsep(&options, ",")) != NULL) {
1670 if (!*p)
1671 continue;
1672 /*
1673 * Initialize args struct so we know whether arg was
1674 * found; some options take optional arguments.
1675 */
caecd0af 1676 args[0].to = args[0].from = NULL;
26092bf5
TT		 1677 token = match_token(p, tokens, args);
1678 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1679 journal_ioprio, is_remount) < 0)
1680 return 0;
ac27a0ec
DK		 1681 }
1682#ifdef CONFIG_QUOTA
1683 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1684 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1685 clear_opt(sb, USRQUOTA);
ac27a0ec 1686
482a7425 1687 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1688 clear_opt(sb, GRPQUOTA);
ac27a0ec 1689
56c50f11 1690 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1691 ext4_msg(sb, KERN_ERR, "old and new quota "
1692 "format mixing");
ac27a0ec
DK		 1693 return 0;
1694 }
1695
1696 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1697 ext4_msg(sb, KERN_ERR, "journaled quota format "
1698 "not specified");
ac27a0ec
DK		 1699 return 0;
1700 }
1701 } else {
1702 if (sbi->s_jquota_fmt) {
b31e1552 1703 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1704 "specified with no journaling "
b31e1552 1705 "enabled");
ac27a0ec
DK		 1706 return 0;
1707 }
1708 }
1709#endif
1710 return 1;
1711}
1712
2adf6da8
TT		 1713static inline void ext4_show_quota_options(struct seq_file *seq,
1714 struct super_block *sb)
1715{
1716#if defined(CONFIG_QUOTA)
1717 struct ext4_sb_info *sbi = EXT4_SB(sb);
1718
1719 if (sbi->s_jquota_fmt) {
1720 char *fmtname = "";
1721
1722 switch (sbi->s_jquota_fmt) {
1723 case QFMT_VFS_OLD:
1724 fmtname = "vfsold";
1725 break;
1726 case QFMT_VFS_V0:
1727 fmtname = "vfsv0";
1728 break;
1729 case QFMT_VFS_V1:
1730 fmtname = "vfsv1";
1731 break;
1732 }
1733 seq_printf(seq, ",jqfmt=%s", fmtname);
1734 }
1735
1736 if (sbi->s_qf_names[USRQUOTA])
1737 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1738
1739 if (sbi->s_qf_names[GRPQUOTA])
1740 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1741
1742 if (test_opt(sb, USRQUOTA))
1743 seq_puts(seq, ",usrquota");
1744
1745 if (test_opt(sb, GRPQUOTA))
1746 seq_puts(seq, ",grpquota");
1747#endif
1748}
1749
5a916be1
TT		 1750static const char *token2str(int token)
1751{
1752 static const struct match_token *t;
1753
1754 for (t = tokens; t->token != Opt_err; t++)
1755 if (t->token == token && !strchr(t->pattern, '='))
1756 break;
1757 return t->pattern;
1758}
1759
2adf6da8
TT		 1760/*
1761 * Show an option if
1762 * - it's set to a non-default value OR
1763 * - if the per-sb default is different from the global default
1764 */
66acdcf4
TT		 1765static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1766 int nodefs)
2adf6da8 1767{
2adf6da8
TT		 1768 struct ext4_sb_info *sbi = EXT4_SB(sb);
1769 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1770 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1771 const struct mount_opts *m;
66acdcf4 1772 char sep = nodefs ? '\n' : ',';
2adf6da8 1773
66acdcf4
TT		 1774#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1775#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1776
1777 if (sbi->s_sb_block != 1)
5a916be1
TT		 1778 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1779
1780 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1781 int want_set = m->flags & MOPT_SET;
1782 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1783 (m->flags & MOPT_CLEAR_ERR))
1784 continue;
66acdcf4 1785 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1786 continue; /* skip if same as the default */
1787 if ((want_set &&
1788 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1789 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1790 continue; /* select Opt_noFoo vs Opt_Foo */
1791 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1792 }
5a916be1 1793
08cefc7a 1794 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1795 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1796 SEQ_OPTS_PRINT("resuid=%u",
1797 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1798 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1799 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1800 SEQ_OPTS_PRINT("resgid=%u",
1801 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1802 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1803 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1804 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1805 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1806 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1807 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1808 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1809 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1810 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1811 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1812 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1813 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1814 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1815 if (sb->s_flags & MS_I_VERSION)
5a916be1 1816 SEQ_OPTS_PUTS("i_version");
66acdcf4 1817 if (nodefs || sbi->s_stripe)
5a916be1 1818 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1819 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1820 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1821 SEQ_OPTS_PUTS("data=journal");
1822 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1823 SEQ_OPTS_PUTS("data=ordered");
1824 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1825 SEQ_OPTS_PUTS("data=writeback");
1826 }
66acdcf4
TT		 1827 if (nodefs ||
1828 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1829 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1830 sbi->s_inode_readahead_blks);
2adf6da8 1831
66acdcf4
TT		 1832 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1833 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1834 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1835 if (nodefs || sbi->s_max_dir_size_kb)
1836 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1837
1838 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1839 return 0;
1840}
1841
66acdcf4
TT		 1842static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1843{
1844 return _ext4_show_options(seq, root->d_sb, 0);
1845}
1846
1847static int options_seq_show(struct seq_file *seq, void *offset)
1848{
1849 struct super_block *sb = seq->private;
1850 int rc;
1851
1852 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1853 rc = _ext4_show_options(seq, sb, 1);
1854 seq_puts(seq, "\n");
1855 return rc;
1856}
1857
1858static int options_open_fs(struct inode *inode, struct file *file)
1859{
1860 return single_open(file, options_seq_show, PDE(inode)->data);
1861}
1862
1863static const struct file_operations ext4_seq_options_fops = {
1864 .owner = THIS_MODULE,
1865 .open = options_open_fs,
1866 .read = seq_read,
1867 .llseek = seq_lseek,
1868 .release = single_release,
1869};
1870
617ba13b 1871static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1872 int read_only)
1873{
617ba13b 1874 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1875 int res = 0;
1876
617ba13b 1877 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1878 ext4_msg(sb, KERN_ERR, "revision level too high, "
1879 "forcing read-only mode");
ac27a0ec
DK		 1880 res = MS_RDONLY;
1881 }
1882 if (read_only)
281b5995 1883 goto done;
617ba13b 1884 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1885 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1886 "running e2fsck is recommended");
617ba13b 1887 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1888 ext4_msg(sb, KERN_WARNING,
1889 "warning: mounting fs with errors, "
1890 "running e2fsck is recommended");
ed3ce80a 1891 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1892 le16_to_cpu(es->s_mnt_count) >=
1893 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1894 ext4_msg(sb, KERN_WARNING,
1895 "warning: maximal mount count reached, "
1896 "running e2fsck is recommended");
ac27a0ec
DK		 1897 else if (le32_to_cpu(es->s_checkinterval) &&
1898 (le32_to_cpu(es->s_lastcheck) +
1899 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1900 ext4_msg(sb, KERN_WARNING,
1901 "warning: checktime reached, "
1902 "running e2fsck is recommended");
0b8e58a1 1903 if (!sbi->s_journal)
0390131b 1904 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1905 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1906 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1907 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1908 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1909 ext4_update_dynamic_rev(sb);
0390131b
FM		 1910 if (sbi->s_journal)
1911 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1912
e2d67052 1913 ext4_commit_super(sb, 1);
281b5995 1914done:
ac27a0ec 1915 if (test_opt(sb, DEBUG))
a9df9a49 1916 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1917 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1918 sb->s_blocksize,
1919 sbi->s_groups_count,
617ba13b
MC		 1920 EXT4_BLOCKS_PER_GROUP(sb),
1921 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1922 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1923
7abc52c2 1924 cleancache_init_fs(sb);
ac27a0ec
DK		 1925 return res;
1926}
1927
772cb7c8
JS		 1928static int ext4_fill_flex_info(struct super_block *sb)
1929{
1930 struct ext4_sb_info *sbi = EXT4_SB(sb);
1931 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1932 ext4_group_t flex_group_count;
1933 ext4_group_t flex_group;
d50f2ab6 1934 unsigned int groups_per_flex = 0;
c5ca7c76 1935 size_t size;
772cb7c8
JS		 1936 int i;
1937
503358ae 1938 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1939 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1940 sbi->s_log_groups_per_flex = 0;
1941 return 1;
1942 }
d50f2ab6 1943 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1944
c62a11fd
FB		 1945 /* We allocate both existing and potentially added groups */
1946 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1947 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1948 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1949 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1950 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1951 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1952 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1953 flex_group_count);
1954 goto failed;
772cb7c8 1955 }
772cb7c8 1956
772cb7c8 1957 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1958 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1959
1960 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1961 atomic_add(ext4_free_inodes_count(sb, gdp),
1962 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1963 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1964 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1965 atomic_add(ext4_used_dirs_count(sb, gdp),
1966 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1967 }
1968
1969 return 1;
1970failed:
1971 return 0;
1972}
1973
feb0ab32
DW		 1974static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1975 struct ext4_group_desc *gdp)
717d50e4 1976{
feb0ab32 1977 int offset;
717d50e4 1978 __u16 crc = 0;
feb0ab32 1979 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1980
feb0ab32
DW		 1981 if ((sbi->s_es->s_feature_ro_compat &
1982 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1983 /* Use new metadata_csum algorithm */
1984 __u16 old_csum;
1985 __u32 csum32;
1986
1987 old_csum = gdp->bg_checksum;
1988 gdp->bg_checksum = 0;
1989 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1990 sizeof(le_group));
1991 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1992 sbi->s_desc_size);
1993 gdp->bg_checksum = old_csum;
1994
1995 crc = csum32 & 0xFFFF;
1996 goto out;
717d50e4
AD		 1997 }
1998
feb0ab32
DW		 1999 /* old crc16 code */
2000 offset = offsetof(struct ext4_group_desc, bg_checksum);
2001
2002 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2003 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2004 crc = crc16(crc, (__u8 *)gdp, offset);
2005 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2006 /* for checksum of struct ext4_group_desc do the rest...*/
2007 if ((sbi->s_es->s_feature_incompat &
2008 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2009 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2010 crc = crc16(crc, (__u8 *)gdp + offset,
2011 le16_to_cpu(sbi->s_es->s_desc_size) -
2012 offset);
2013
2014out:
717d50e4
AD		 2015 return cpu_to_le16(crc);
2016}
2017
feb0ab32 2018int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2019 struct ext4_group_desc *gdp)
2020{
feb0ab32
DW		 2021 if (ext4_has_group_desc_csum(sb) &&
2022 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2023 block_group, gdp)))
717d50e4
AD		 2024 return 0;
2025
2026 return 1;
2027}
2028
feb0ab32
DW		 2029void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2030 struct ext4_group_desc *gdp)
2031{
2032 if (!ext4_has_group_desc_csum(sb))
2033 return;
2034 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2035}
2036
ac27a0ec 2037/* Called at mount-time, super-block is locked */
bfff6873
LC		 2038static int ext4_check_descriptors(struct super_block *sb,
2039 ext4_group_t *first_not_zeroed)
ac27a0ec 2040{
617ba13b
MC		 2041 struct ext4_sb_info *sbi = EXT4_SB(sb);
2042 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2043 ext4_fsblk_t last_block;
bd81d8ee
LV		 2044 ext4_fsblk_t block_bitmap;
2045 ext4_fsblk_t inode_bitmap;
2046 ext4_fsblk_t inode_table;
ce421581 2047 int flexbg_flag = 0;
bfff6873 2048 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2049
ce421581
JS		 2050 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2051 flexbg_flag = 1;
2052
af5bc92d 2053 ext4_debug("Checking group descriptors");
ac27a0ec 2054
197cd65a
AM		 2055 for (i = 0; i < sbi->s_groups_count; i++) {
2056 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2057
ce421581 2058 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2059 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2060 else
2061 last_block = first_block +
617ba13b 2062 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2063
bfff6873
LC		 2064 if ((grp == sbi->s_groups_count) &&
2065 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2066 grp = i;
2067
8fadc143 2068 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2069 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2070 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2071 "Block bitmap for group %u not in group "
b31e1552 2072 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2073 return 0;
2074 }
8fadc143 2075 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2076 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2077 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2078 "Inode bitmap for group %u not in group "
b31e1552 2079 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2080 return 0;
2081 }
8fadc143 2082 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2083 if (inode_table < first_block ||
2b2d6d01 2084 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2085 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2086 "Inode table for group %u not in group "
b31e1552 2087 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2088 return 0;
2089 }
955ce5f5 2090 ext4_lock_group(sb, i);
feb0ab32 2091 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2092 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2093 "Checksum for group %u failed (%u!=%u)",
2094 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2095 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2096 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2097 ext4_unlock_group(sb, i);
8a266467 2098 return 0;
7ee1ec4c 2099 }
717d50e4 2100 }
955ce5f5 2101 ext4_unlock_group(sb, i);
ce421581
JS		 2102 if (!flexbg_flag)
2103 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2104 }
bfff6873
LC		 2105 if (NULL != first_not_zeroed)
2106 *first_not_zeroed = grp;
ac27a0ec 2107
5dee5437
TT		 2108 ext4_free_blocks_count_set(sbi->s_es,
2109 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2110 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2111 return 1;
2112}
2113
617ba13b 2114/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2115 * the superblock) which were deleted from all directories, but held open by
2116 * a process at the time of a crash. We walk the list and try to delete these
2117 * inodes at recovery time (only with a read-write filesystem).
2118 *
2119 * In order to keep the orphan inode chain consistent during traversal (in
2120 * case of crash during recovery), we link each inode into the superblock
2121 * orphan list_head and handle it the same way as an inode deletion during
2122 * normal operation (which journals the operations for us).
2123 *
2124 * We only do an iget() and an iput() on each inode, which is very safe if we
2125 * accidentally point at an in-use or already deleted inode. The worst that
2126 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2127 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2128 * e2fsck was run on this filesystem, and it must have already done the orphan
2129 * inode cleanup for us, so we can safely abort without any further action.
2130 */
2b2d6d01
TT		 2131static void ext4_orphan_cleanup(struct super_block *sb,
2132 struct ext4_super_block *es)
ac27a0ec
DK		 2133{
2134 unsigned int s_flags = sb->s_flags;
2135 int nr_orphans = 0, nr_truncates = 0;
2136#ifdef CONFIG_QUOTA
2137 int i;
2138#endif
2139 if (!es->s_last_orphan) {
2140 jbd_debug(4, "no orphan inodes to clean up\n");
2141 return;
2142 }
2143
a8f48a95 2144 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2145 ext4_msg(sb, KERN_ERR, "write access "
2146 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2147 return;
2148 }
2149
d39195c3
AG		 2150 /* Check if feature set would not allow a r/w mount */
2151 if (!ext4_feature_set_ok(sb, 0)) {
2152 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2153 "unknown ROCOMPAT features");
2154 return;
2155 }
2156
617ba13b 2157 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2158 if (es->s_last_orphan)
2159 jbd_debug(1, "Errors on filesystem, "
2160 "clearing orphan list.\n");
2161 es->s_last_orphan = 0;
2162 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2163 return;
2164 }
2165
2166 if (s_flags & MS_RDONLY) {
b31e1552 2167 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2168 sb->s_flags &= ~MS_RDONLY;
2169 }
2170#ifdef CONFIG_QUOTA
2171 /* Needed for iput() to work correctly and not trash data */
2172 sb->s_flags |= MS_ACTIVE;
2173 /* Turn on quotas so that they are updated correctly */
2174 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2175 if (EXT4_SB(sb)->s_qf_names[i]) {
2176 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2177 if (ret < 0)
b31e1552
ES		 2178 ext4_msg(sb, KERN_ERR,
2179 "Cannot turn on journaled "
2180 "quota: error %d", ret);
ac27a0ec
DK		 2181 }
2182 }
2183#endif
2184
2185 while (es->s_last_orphan) {
2186 struct inode *inode;
2187
97bd42b9
JB		 2188 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2189 if (IS_ERR(inode)) {
ac27a0ec
DK		 2190 es->s_last_orphan = 0;
2191 break;
2192 }
2193
617ba13b 2194 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2195 dquot_initialize(inode);
ac27a0ec 2196 if (inode->i_nlink) {
b31e1552
ES		 2197 ext4_msg(sb, KERN_DEBUG,
2198 "%s: truncating inode %lu to %lld bytes",
46e665e9 2199 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2200 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2201 inode->i_ino, inode->i_size);
617ba13b 2202 ext4_truncate(inode);
ac27a0ec
DK		 2203 nr_truncates++;
2204 } else {
b31e1552
ES		 2205 ext4_msg(sb, KERN_DEBUG,
2206 "%s: deleting unreferenced inode %lu",
46e665e9 2207 __func__, inode->i_ino);
ac27a0ec
DK		 2208 jbd_debug(2, "deleting unreferenced inode %lu\n",
2209 inode->i_ino);
2210 nr_orphans++;
2211 }
2212 iput(inode); /* The delete magic happens here! */
2213 }
2214
2b2d6d01 2215#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2216
2217 if (nr_orphans)
b31e1552
ES		 2218 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2219 PLURAL(nr_orphans));
ac27a0ec 2220 if (nr_truncates)
b31e1552
ES		 2221 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2222 PLURAL(nr_truncates));
ac27a0ec
DK		 2223#ifdef CONFIG_QUOTA
2224 /* Turn quotas off */
2225 for (i = 0; i < MAXQUOTAS; i++) {
2226 if (sb_dqopt(sb)->files[i])
287a8095 2227 dquot_quota_off(sb, i);
ac27a0ec
DK		 2228 }
2229#endif
2230 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2231}
0b8e58a1 2232
cd2291a4
ES		 2233/*
2234 * Maximal extent format file size.
2235 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2236 * extent format containers, within a sector_t, and within i_blocks
2237 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2238 * so that won't be a limiting factor.
2239 *
f17722f9
LC		 2240 * However there is other limiting factor. We do store extents in the form
2241 * of starting block and length, hence the resulting length of the extent
2242 * covering maximum file size must fit into on-disk format containers as
2243 * well. Given that length is always by 1 unit bigger than max unit (because
2244 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2245 *
cd2291a4
ES		 2246 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2247 */
f287a1a5 2248static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2249{
2250 loff_t res;
2251 loff_t upper_limit = MAX_LFS_FILESIZE;
2252
2253 /* small i_blocks in vfs inode? */
f287a1a5 2254 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2255 /*
90c699a9 2256 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2257 * i_block represent total blocks in 512 bytes
2258 * 32 == size of vfs inode i_blocks * 8
2259 */
2260 upper_limit = (1LL << 32) - 1;
2261
2262 /* total blocks in file system block size */
2263 upper_limit >>= (blkbits - 9);
2264 upper_limit <<= blkbits;
2265 }
2266
f17722f9
LC		 2267 /*
2268 * 32-bit extent-start container, ee_block. We lower the maxbytes
2269 * by one fs block, so ee_len can cover the extent of maximum file
2270 * size
2271 */
2272 res = (1LL << 32) - 1;
cd2291a4 2273 res <<= blkbits;
cd2291a4
ES		 2274
2275 /* Sanity check against vm- & vfs- imposed limits */
2276 if (res > upper_limit)
2277 res = upper_limit;
2278
2279 return res;
2280}
ac27a0ec 2281
ac27a0ec 2282/*
cd2291a4 2283 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2284 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2285 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2286 */
f287a1a5 2287static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2288{
617ba13b 2289 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2290 int meta_blocks;
2291 loff_t upper_limit;
0b8e58a1
AD		 2292 /* This is calculated to be the largest file size for a dense, block
2293 * mapped file such that the file's total number of 512-byte sectors,
2294 * including data and all indirect blocks, does not exceed (2^48 - 1).
2295 *
2296 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2297 * number of 512-byte sectors of the file.
0fc1b451
AK		 2298 */
2299
f287a1a5 2300 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2301 /*
90c699a9 2302 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2303 * the inode i_block field represents total file blocks in
2304 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2305 */
2306 upper_limit = (1LL << 32) - 1;
2307
2308 /* total blocks in file system block size */
2309 upper_limit >>= (bits - 9);
2310
2311 } else {
8180a562
AK		 2312 /*
2313 * We use 48 bit ext4_inode i_blocks
2314 * With EXT4_HUGE_FILE_FL set the i_blocks
2315 * represent total number of blocks in
2316 * file system block size
2317 */
0fc1b451
AK		 2318 upper_limit = (1LL << 48) - 1;
2319
0fc1b451
AK		 2320 }
2321
2322 /* indirect blocks */
2323 meta_blocks = 1;
2324 /* double indirect blocks */
2325 meta_blocks += 1 + (1LL << (bits-2));
2326 /* tripple indirect blocks */
2327 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2328
2329 upper_limit -= meta_blocks;
2330 upper_limit <<= bits;
ac27a0ec
DK		 2331
2332 res += 1LL << (bits-2);
2333 res += 1LL << (2*(bits-2));
2334 res += 1LL << (3*(bits-2));
2335 res <<= bits;
2336 if (res > upper_limit)
2337 res = upper_limit;
0fc1b451
AK		 2338
2339 if (res > MAX_LFS_FILESIZE)
2340 res = MAX_LFS_FILESIZE;
2341
ac27a0ec
DK		 2342 return res;
2343}
2344
617ba13b 2345static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2346 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2347{
617ba13b 2348 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2349 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2350 int has_super = 0;
2351
2352 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2353
617ba13b 2354 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2355 nr < first_meta_bg)
70bbb3e0 2356 return logical_sb_block + nr + 1;
ac27a0ec 2357 bg = sbi->s_desc_per_block * nr;
617ba13b 2358 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2359 has_super = 1;
0b8e58a1 2360
617ba13b 2361 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2362}
2363
c9de560d
AT		 2364/**
2365 * ext4_get_stripe_size: Get the stripe size.
2366 * @sbi: In memory super block info
2367 *
2368 * If we have specified it via mount option, then
2369 * use the mount option value. If the value specified at mount time is
2370 * greater than the blocks per group use the super block value.
2371 * If the super block value is greater than blocks per group return 0.
2372 * Allocator needs it be less than blocks per group.
2373 *
2374 */
2375static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2376{
2377 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2378 unsigned long stripe_width =
2379 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2380 int ret;
c9de560d
AT		 2381
2382 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2383 ret = sbi->s_stripe;
2384 else if (stripe_width <= sbi->s_blocks_per_group)
2385 ret = stripe_width;
2386 else if (stride <= sbi->s_blocks_per_group)
2387 ret = stride;
2388 else
2389 ret = 0;
c9de560d 2390
3eb08658
DE		 2391 /*
2392 * If the stripe width is 1, this makes no sense and
2393 * we set it to 0 to turn off stripe handling code.
2394 */
2395 if (ret <= 1)
2396 ret = 0;
c9de560d 2397
3eb08658 2398 return ret;
c9de560d 2399}
ac27a0ec 2400
3197ebdb
TT		 2401/* sysfs supprt */
2402
2403struct ext4_attr {
2404 struct attribute attr;
2405 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2406 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2407 const char *, size_t);
2408 int offset;
2409};
2410
2411static int parse_strtoul(const char *buf,
2412 unsigned long max, unsigned long *value)
2413{
2414 char *endp;
2415
e7d2860b
AGR		 2416 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2417 endp = skip_spaces(endp);
3197ebdb
TT		 2418 if (*endp || *value > max)
2419 return -EINVAL;
2420
2421 return 0;
2422}
2423
2424static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2425 struct ext4_sb_info *sbi,
2426 char *buf)
2427{
2428 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2429 (s64) EXT4_C2B(sbi,
2430 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2431}
2432
2433static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2434 struct ext4_sb_info *sbi, char *buf)
2435{
2436 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2437
f613dfcb
TT		 2438 if (!sb->s_bdev->bd_part)
2439 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2440 return snprintf(buf, PAGE_SIZE, "%lu\n",
2441 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2442 sbi->s_sectors_written_start) >> 1);
2443}
2444
2445static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2446 struct ext4_sb_info *sbi, char *buf)
2447{
2448 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2449
f613dfcb
TT		 2450 if (!sb->s_bdev->bd_part)
2451 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2452 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2453 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2454 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2455 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2456}
2457
2458static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2459 struct ext4_sb_info *sbi,
2460 const char *buf, size_t count)
2461{
2462 unsigned long t;
2463
2464 if (parse_strtoul(buf, 0x40000000, &t))
2465 return -EINVAL;
2466
5dbd571d 2467 if (t && !is_power_of_2(t))
3197ebdb
TT		 2468 return -EINVAL;
2469
2470 sbi->s_inode_readahead_blks = t;
2471 return count;
2472}
2473
2474static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2475 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2476{
2477 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2478
2479 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2480}
2481
2482static ssize_t sbi_ui_store(struct ext4_attr *a,
2483 struct ext4_sb_info *sbi,
2484 const char *buf, size_t count)
2485{
2486 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2487 unsigned long t;
2488
2489 if (parse_strtoul(buf, 0xffffffff, &t))
2490 return -EINVAL;
2491 *ui = t;
2492 return count;
2493}
2494
2c0544b2
TT		 2495static ssize_t trigger_test_error(struct ext4_attr *a,
2496 struct ext4_sb_info *sbi,
2497 const char *buf, size_t count)
2498{
2499 int len = count;
2500
2501 if (!capable(CAP_SYS_ADMIN))
2502 return -EPERM;
2503
2504 if (len && buf[len-1] == '\n')
2505 len--;
2506
2507 if (len)
2508 ext4_error(sbi->s_sb, "%.*s", len, buf);
2509 return count;
2510}
2511
3197ebdb
TT		 2512#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2513static struct ext4_attr ext4_attr_##_name = { \
2514 .attr = {.name = __stringify(_name), .mode = _mode }, \
2515 .show = _show, \
2516 .store = _store, \
2517 .offset = offsetof(struct ext4_sb_info, _elname), \
2518}
2519#define EXT4_ATTR(name, mode, show, store) \
2520static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2521
857ac889 2522#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2523#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2524#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2525#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2526 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2527#define ATTR_LIST(name) &ext4_attr_##name.attr
2528
2529EXT4_RO_ATTR(delayed_allocation_blocks);
2530EXT4_RO_ATTR(session_write_kbytes);
2531EXT4_RO_ATTR(lifetime_write_kbytes);
2532EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2533 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2534EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2535EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2536EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2537EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2538EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2539EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2540EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2541EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
67a5da56 2542EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2543EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2544
2545static struct attribute *ext4_attrs[] = {
2546 ATTR_LIST(delayed_allocation_blocks),
2547 ATTR_LIST(session_write_kbytes),
2548 ATTR_LIST(lifetime_write_kbytes),
2549 ATTR_LIST(inode_readahead_blks),
11013911 2550 ATTR_LIST(inode_goal),
3197ebdb
TT		 2551 ATTR_LIST(mb_stats),
2552 ATTR_LIST(mb_max_to_scan),
2553 ATTR_LIST(mb_min_to_scan),
2554 ATTR_LIST(mb_order2_req),
2555 ATTR_LIST(mb_stream_req),
2556 ATTR_LIST(mb_group_prealloc),
55138e0b 2557 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2558 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2559 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2560 NULL,
2561};
2562
857ac889
LC		 2563/* Features this copy of ext4 supports */
2564EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2565EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2566
2567static struct attribute *ext4_feat_attrs[] = {
2568 ATTR_LIST(lazy_itable_init),
27ee40df 2569 ATTR_LIST(batched_discard),
857ac889
LC		 2570 NULL,
2571};
2572
3197ebdb
TT		 2573static ssize_t ext4_attr_show(struct kobject *kobj,
2574 struct attribute *attr, char *buf)
2575{
2576 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2577 s_kobj);
2578 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2579
2580 return a->show ? a->show(a, sbi, buf) : 0;
2581}
2582
2583static ssize_t ext4_attr_store(struct kobject *kobj,
2584 struct attribute *attr,
2585 const char *buf, size_t len)
2586{
2587 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2588 s_kobj);
2589 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2590
2591 return a->store ? a->store(a, sbi, buf, len) : 0;
2592}
2593
2594static void ext4_sb_release(struct kobject *kobj)
2595{
2596 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2597 s_kobj);
2598 complete(&sbi->s_kobj_unregister);
2599}
2600
52cf25d0 2601static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2602 .show = ext4_attr_show,
2603 .store = ext4_attr_store,
2604};
2605
2606static struct kobj_type ext4_ktype = {
2607 .default_attrs = ext4_attrs,
2608 .sysfs_ops = &ext4_attr_ops,
2609 .release = ext4_sb_release,
2610};
2611
857ac889
LC		 2612static void ext4_feat_release(struct kobject *kobj)
2613{
2614 complete(&ext4_feat->f_kobj_unregister);
2615}
2616
2617static struct kobj_type ext4_feat_ktype = {
2618 .default_attrs = ext4_feat_attrs,
2619 .sysfs_ops = &ext4_attr_ops,
2620 .release = ext4_feat_release,
2621};
2622
a13fb1a4
ES		 2623/*
2624 * Check whether this filesystem can be mounted based on
2625 * the features present and the RDONLY/RDWR mount requested.
2626 * Returns 1 if this filesystem can be mounted as requested,
2627 * 0 if it cannot be.
2628 */
2629static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2630{
2631 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2632 ext4_msg(sb, KERN_ERR,
2633 "Couldn't mount because of "
2634 "unsupported optional features (%x)",
2635 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2636 ~EXT4_FEATURE_INCOMPAT_SUPP));
2637 return 0;
2638 }
2639
2640 if (readonly)
2641 return 1;
2642
2643 /* Check that feature set is OK for a read-write mount */
2644 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2645 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2646 "unsupported optional features (%x)",
2647 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2648 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2649 return 0;
2650 }
2651 /*
2652 * Large file size enabled file system can only be mounted
2653 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2654 */
2655 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2656 if (sizeof(blkcnt_t) < sizeof(u64)) {
2657 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2658 "cannot be mounted RDWR without "
2659 "CONFIG_LBDAF");
2660 return 0;
2661 }
2662 }
bab08ab9
TT		 2663 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2664 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2665 ext4_msg(sb, KERN_ERR,
2666 "Can't support bigalloc feature without "
2667 "extents feature\n");
2668 return 0;
2669 }
7c319d32
AK		 2670
2671#ifndef CONFIG_QUOTA
2672 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2673 !readonly) {
2674 ext4_msg(sb, KERN_ERR,
2675 "Filesystem with quota feature cannot be mounted RDWR "
2676 "without CONFIG_QUOTA");
2677 return 0;
2678 }
2679#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2680 return 1;
2681}
2682
66e61a9e
TT		 2683/*
2684 * This function is called once a day if we have errors logged
2685 * on the file system
2686 */
2687static void print_daily_error_info(unsigned long arg)
2688{
2689 struct super_block *sb = (struct super_block *) arg;
2690 struct ext4_sb_info *sbi;
2691 struct ext4_super_block *es;
2692
2693 sbi = EXT4_SB(sb);
2694 es = sbi->s_es;
2695
2696 if (es->s_error_count)
2697 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2698 le32_to_cpu(es->s_error_count));
2699 if (es->s_first_error_time) {
2700 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2701 sb->s_id, le32_to_cpu(es->s_first_error_time),
2702 (int) sizeof(es->s_first_error_func),
2703 es->s_first_error_func,
2704 le32_to_cpu(es->s_first_error_line));
2705 if (es->s_first_error_ino)
2706 printk(": inode %u",
2707 le32_to_cpu(es->s_first_error_ino));
2708 if (es->s_first_error_block)
2709 printk(": block %llu", (unsigned long long)
2710 le64_to_cpu(es->s_first_error_block));
2711 printk("\n");
2712 }
2713 if (es->s_last_error_time) {
2714 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2715 sb->s_id, le32_to_cpu(es->s_last_error_time),
2716 (int) sizeof(es->s_last_error_func),
2717 es->s_last_error_func,
2718 le32_to_cpu(es->s_last_error_line));
2719 if (es->s_last_error_ino)
2720 printk(": inode %u",
2721 le32_to_cpu(es->s_last_error_ino));
2722 if (es->s_last_error_block)
2723 printk(": block %llu", (unsigned long long)
2724 le64_to_cpu(es->s_last_error_block));
2725 printk("\n");
2726 }
2727 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2728}
2729
bfff6873
LC		 2730/* Find next suitable group and run ext4_init_inode_table */
2731static int ext4_run_li_request(struct ext4_li_request *elr)
2732{
2733 struct ext4_group_desc *gdp = NULL;
2734 ext4_group_t group, ngroups;
2735 struct super_block *sb;
2736 unsigned long timeout = 0;
2737 int ret = 0;
2738
2739 sb = elr->lr_super;
2740 ngroups = EXT4_SB(sb)->s_groups_count;
2741
8e8ad8a5 2742 sb_start_write(sb);
bfff6873
LC		 2743 for (group = elr->lr_next_group; group < ngroups; group++) {
2744 gdp = ext4_get_group_desc(sb, group, NULL);
2745 if (!gdp) {
2746 ret = 1;
2747 break;
2748 }
2749
2750 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2751 break;
2752 }
2753
2754 if (group == ngroups)
2755 ret = 1;
2756
2757 if (!ret) {
2758 timeout = jiffies;
2759 ret = ext4_init_inode_table(sb, group,
2760 elr->lr_timeout ? 0 : 1);
2761 if (elr->lr_timeout == 0) {
51ce6511
LC		 2762 timeout = (jiffies - timeout) *
2763 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2764 elr->lr_timeout = timeout;
2765 }
2766 elr->lr_next_sched = jiffies + elr->lr_timeout;
2767 elr->lr_next_group = group + 1;
2768 }
8e8ad8a5 2769 sb_end_write(sb);
bfff6873
LC		 2770
2771 return ret;
2772}
2773
2774/*
2775 * Remove lr_request from the list_request and free the
4ed5c033 2776 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2777 */
2778static void ext4_remove_li_request(struct ext4_li_request *elr)
2779{
2780 struct ext4_sb_info *sbi;
2781
2782 if (!elr)
2783 return;
2784
2785 sbi = elr->lr_sbi;
2786
2787 list_del(&elr->lr_request);
2788 sbi->s_li_request = NULL;
2789 kfree(elr);
2790}
2791
2792static void ext4_unregister_li_request(struct super_block *sb)
2793{
1bb933fb
LC		 2794 mutex_lock(&ext4_li_mtx);
2795 if (!ext4_li_info) {
2796 mutex_unlock(&ext4_li_mtx);
bfff6873 2797 return;
1bb933fb 2798 }
bfff6873
LC		 2799
2800 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2801 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2802 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2803 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2804}
2805
8f1f7453
ES		 2806static struct task_struct *ext4_lazyinit_task;
2807
bfff6873
LC		 2808/*
2809 * This is the function where ext4lazyinit thread lives. It walks
2810 * through the request list searching for next scheduled filesystem.
2811 * When such a fs is found, run the lazy initialization request
2812 * (ext4_rn_li_request) and keep track of the time spend in this
2813 * function. Based on that time we compute next schedule time of
2814 * the request. When walking through the list is complete, compute
2815 * next waking time and put itself into sleep.
2816 */
2817static int ext4_lazyinit_thread(void *arg)
2818{
2819 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2820 struct list_head *pos, *n;
2821 struct ext4_li_request *elr;
4ed5c033 2822 unsigned long next_wakeup, cur;
bfff6873
LC		 2823
2824 BUG_ON(NULL == eli);
2825
bfff6873
LC		 2826cont_thread:
2827 while (true) {
2828 next_wakeup = MAX_JIFFY_OFFSET;
2829
2830 mutex_lock(&eli->li_list_mtx);
2831 if (list_empty(&eli->li_request_list)) {
2832 mutex_unlock(&eli->li_list_mtx);
2833 goto exit_thread;
2834 }
2835
2836 list_for_each_safe(pos, n, &eli->li_request_list) {
2837 elr = list_entry(pos, struct ext4_li_request,
2838 lr_request);
2839
b2c78cd0
TT		 2840 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2841 if (ext4_run_li_request(elr) != 0) {
2842 /* error, remove the lazy_init job */
2843 ext4_remove_li_request(elr);
2844 continue;
2845 }
bfff6873
LC		 2846 }
2847
2848 if (time_before(elr->lr_next_sched, next_wakeup))
2849 next_wakeup = elr->lr_next_sched;
2850 }
2851 mutex_unlock(&eli->li_list_mtx);
2852
a0acae0e 2853 try_to_freeze();
bfff6873 2854
4ed5c033
LC		 2855 cur = jiffies;
2856 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2857 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2858 cond_resched();
2859 continue;
2860 }
2861
4ed5c033
LC		 2862 schedule_timeout_interruptible(next_wakeup - cur);
2863
8f1f7453
ES		 2864 if (kthread_should_stop()) {
2865 ext4_clear_request_list();
2866 goto exit_thread;
2867 }
bfff6873
LC		 2868 }
2869
2870exit_thread:
2871 /*
2872 * It looks like the request list is empty, but we need
2873 * to check it under the li_list_mtx lock, to prevent any
2874 * additions into it, and of course we should lock ext4_li_mtx
2875 * to atomically free the list and ext4_li_info, because at
2876 * this point another ext4 filesystem could be registering
2877 * new one.
2878 */
2879 mutex_lock(&ext4_li_mtx);
2880 mutex_lock(&eli->li_list_mtx);
2881 if (!list_empty(&eli->li_request_list)) {
2882 mutex_unlock(&eli->li_list_mtx);
2883 mutex_unlock(&ext4_li_mtx);
2884 goto cont_thread;
2885 }
2886 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2887 kfree(ext4_li_info);
2888 ext4_li_info = NULL;
2889 mutex_unlock(&ext4_li_mtx);
2890
2891 return 0;
2892}
2893
2894static void ext4_clear_request_list(void)
2895{
2896 struct list_head *pos, *n;
2897 struct ext4_li_request *elr;
2898
2899 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2900 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2901 elr = list_entry(pos, struct ext4_li_request,
2902 lr_request);
2903 ext4_remove_li_request(elr);
2904 }
2905 mutex_unlock(&ext4_li_info->li_list_mtx);
2906}
2907
2908static int ext4_run_lazyinit_thread(void)
2909{
8f1f7453
ES		 2910 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2911 ext4_li_info, "ext4lazyinit");
2912 if (IS_ERR(ext4_lazyinit_task)) {
2913 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2914 ext4_clear_request_list();
bfff6873
LC		 2915 kfree(ext4_li_info);
2916 ext4_li_info = NULL;
92b97816 2917 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2918 "initialization thread\n",
2919 err);
2920 return err;
2921 }
2922 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2923 return 0;
2924}
2925
2926/*
2927 * Check whether it make sense to run itable init. thread or not.
2928 * If there is at least one uninitialized inode table, return
2929 * corresponding group number, else the loop goes through all
2930 * groups and return total number of groups.
2931 */
2932static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2933{
2934 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2935 struct ext4_group_desc *gdp = NULL;
2936
2937 for (group = 0; group < ngroups; group++) {
2938 gdp = ext4_get_group_desc(sb, group, NULL);
2939 if (!gdp)
2940 continue;
2941
2942 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2943 break;
2944 }
2945
2946 return group;
2947}
2948
2949static int ext4_li_info_new(void)
2950{
2951 struct ext4_lazy_init *eli = NULL;
2952
2953 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2954 if (!eli)
2955 return -ENOMEM;
2956
bfff6873
LC		 2957 INIT_LIST_HEAD(&eli->li_request_list);
2958 mutex_init(&eli->li_list_mtx);
2959
bfff6873
LC		 2960 eli->li_state |= EXT4_LAZYINIT_QUIT;
2961
2962 ext4_li_info = eli;
2963
2964 return 0;
2965}
2966
2967static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2968 ext4_group_t start)
2969{
2970 struct ext4_sb_info *sbi = EXT4_SB(sb);
2971 struct ext4_li_request *elr;
2972 unsigned long rnd;
2973
2974 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2975 if (!elr)
2976 return NULL;
2977
2978 elr->lr_super = sb;
2979 elr->lr_sbi = sbi;
2980 elr->lr_next_group = start;
2981
2982 /*
2983 * Randomize first schedule time of the request to
2984 * spread the inode table initialization requests
2985 * better.
2986 */
2987 get_random_bytes(&rnd, sizeof(rnd));
2988 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2989 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2990
2991 return elr;
2992}
2993
2994static int ext4_register_li_request(struct super_block *sb,
2995 ext4_group_t first_not_zeroed)
2996{
2997 struct ext4_sb_info *sbi = EXT4_SB(sb);
2998 struct ext4_li_request *elr;
2999 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3000 int ret = 0;
bfff6873 3001
51ce6511
LC		 3002 if (sbi->s_li_request != NULL) {
3003 /*
3004 * Reset timeout so it can be computed again, because
3005 * s_li_wait_mult might have changed.
3006 */
3007 sbi->s_li_request->lr_timeout = 0;
beed5ecb 3008 return 0;
51ce6511 3009 }
bfff6873
LC		 3010
3011 if (first_not_zeroed == ngroups ||
3012 (sb->s_flags & MS_RDONLY) ||
55ff3840 3013 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 3014 return 0;
bfff6873
LC		 3015
3016 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 3017 if (!elr)
3018 return -ENOMEM;
bfff6873
LC		 3019
3020 mutex_lock(&ext4_li_mtx);
3021
3022 if (NULL == ext4_li_info) {
3023 ret = ext4_li_info_new();
3024 if (ret)
3025 goto out;
3026 }
3027
3028 mutex_lock(&ext4_li_info->li_list_mtx);
3029 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3030 mutex_unlock(&ext4_li_info->li_list_mtx);
3031
3032 sbi->s_li_request = elr;
46e4690b
TM		 3033 /*
3034 * set elr to NULL here since it has been inserted to
3035 * the request_list and the removal and free of it is
3036 * handled by ext4_clear_request_list from now on.
3037 */
3038 elr = NULL;
bfff6873
LC		 3039
3040 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3041 ret = ext4_run_lazyinit_thread();
3042 if (ret)
3043 goto out;
3044 }
bfff6873 3045out:
beed5ecb
NK		 3046 mutex_unlock(&ext4_li_mtx);
3047 if (ret)
bfff6873 3048 kfree(elr);
bfff6873
LC		 3049 return ret;
3050}
3051
3052/*
3053 * We do not need to lock anything since this is called on
3054 * module unload.
3055 */
3056static void ext4_destroy_lazyinit_thread(void)
3057{
3058 /*
3059 * If thread exited earlier
3060 * there's nothing to be done.
3061 */
8f1f7453 3062 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3063 return;
3064
8f1f7453 3065 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3066}
3067
25ed6e8a
DW		 3068static int set_journal_csum_feature_set(struct super_block *sb)
3069{
3070 int ret = 1;
3071 int compat, incompat;
3072 struct ext4_sb_info *sbi = EXT4_SB(sb);
3073
3074 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3075 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3076 /* journal checksum v2 */
3077 compat = 0;
3078 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3079 } else {
3080 /* journal checksum v1 */
3081 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3082 incompat = 0;
3083 }
3084
3085 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3086 ret = jbd2_journal_set_features(sbi->s_journal,
3087 compat, 0,
3088 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3089 incompat);
3090 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3091 ret = jbd2_journal_set_features(sbi->s_journal,
3092 compat, 0,
3093 incompat);
3094 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3095 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3096 } else {
3097 jbd2_journal_clear_features(sbi->s_journal,
3098 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3099 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3100 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3101 }
3102
3103 return ret;
3104}
3105
952fc18e
TT		 3106/*
3107 * Note: calculating the overhead so we can be compatible with
3108 * historical BSD practice is quite difficult in the face of
3109 * clusters/bigalloc. This is because multiple metadata blocks from
3110 * different block group can end up in the same allocation cluster.
3111 * Calculating the exact overhead in the face of clustered allocation
3112 * requires either O(all block bitmaps) in memory or O(number of block
3113 * groups**2) in time. We will still calculate the superblock for
3114 * older file systems --- and if we come across with a bigalloc file
3115 * system with zero in s_overhead_clusters the estimate will be close to
3116 * correct especially for very large cluster sizes --- but for newer
3117 * file systems, it's better to calculate this figure once at mkfs
3118 * time, and store it in the superblock. If the superblock value is
3119 * present (even for non-bigalloc file systems), we will use it.
3120 */
3121static int count_overhead(struct super_block *sb, ext4_group_t grp,
3122 char *buf)
3123{
3124 struct ext4_sb_info *sbi = EXT4_SB(sb);
3125 struct ext4_group_desc *gdp;
3126 ext4_fsblk_t first_block, last_block, b;
3127 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3128 int s, j, count = 0;
3129
0548bbb8
TT		 3130 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3131 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3132 sbi->s_itb_per_group + 2);
3133
952fc18e
TT		 3134 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3135 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3136 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3137 for (i = 0; i < ngroups; i++) {
3138 gdp = ext4_get_group_desc(sb, i, NULL);
3139 b = ext4_block_bitmap(sb, gdp);
3140 if (b >= first_block && b <= last_block) {
3141 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3142 count++;
3143 }
3144 b = ext4_inode_bitmap(sb, gdp);
3145 if (b >= first_block && b <= last_block) {
3146 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3147 count++;
3148 }
3149 b = ext4_inode_table(sb, gdp);
3150 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3151 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3152 int c = EXT4_B2C(sbi, b - first_block);
3153 ext4_set_bit(c, buf);
3154 count++;
3155 }
3156 if (i != grp)
3157 continue;
3158 s = 0;
3159 if (ext4_bg_has_super(sb, grp)) {
3160 ext4_set_bit(s++, buf);
3161 count++;
3162 }
3163 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3164 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3165 count++;
3166 }
3167 }
3168 if (!count)
3169 return 0;
3170 return EXT4_CLUSTERS_PER_GROUP(sb) -
3171 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3172}
3173
3174/*
3175 * Compute the overhead and stash it in sbi->s_overhead
3176 */
3177int ext4_calculate_overhead(struct super_block *sb)
3178{
3179 struct ext4_sb_info *sbi = EXT4_SB(sb);
3180 struct ext4_super_block *es = sbi->s_es;
3181 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3182 ext4_fsblk_t overhead = 0;
3183 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3184
3185 memset(buf, 0, PAGE_SIZE);
3186 if (!buf)
3187 return -ENOMEM;
3188
3189 /*
3190 * Compute the overhead (FS structures). This is constant
3191 * for a given filesystem unless the number of block groups
3192 * changes so we cache the previous value until it does.
3193 */
3194
3195 /*
3196 * All of the blocks before first_data_block are overhead
3197 */
3198 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3199
3200 /*
3201 * Add the overhead found in each block group
3202 */
3203 for (i = 0; i < ngroups; i++) {
3204 int blks;
3205
3206 blks = count_overhead(sb, i, buf);
3207 overhead += blks;
3208 if (blks)
3209 memset(buf, 0, PAGE_SIZE);
3210 cond_resched();
3211 }
3212 sbi->s_overhead = overhead;
3213 smp_wmb();
3214 free_page((unsigned long) buf);
3215 return 0;
3216}
3217
2b2d6d01 3218static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3219{
d4c402d9 3220 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3221 struct buffer_head *bh;
617ba13b
MC		 3222 struct ext4_super_block *es = NULL;
3223 struct ext4_sb_info *sbi;
3224 ext4_fsblk_t block;
3225 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3226 ext4_fsblk_t logical_sb_block;
ac27a0ec 3227 unsigned long offset = 0;
ac27a0ec
DK		 3228 unsigned long journal_devnum = 0;
3229 unsigned long def_mount_opts;
3230 struct inode *root;
9f6200bb 3231 char *cp;
0390131b 3232 const char *descr;
dcc7dae3 3233 int ret = -ENOMEM;
281b5995 3234 int blocksize, clustersize;
4ec11028
TT		 3235 unsigned int db_count;
3236 unsigned int i;
281b5995 3237 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3238 __u64 blocks_count;
833f4077 3239 int err;
b3881f74 3240 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3241 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3242
3243 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3244 if (!sbi)
dcc7dae3 3245 goto out_free_orig;
705895b6
PE		 3246
3247 sbi->s_blockgroup_lock =
3248 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3249 if (!sbi->s_blockgroup_lock) {
3250 kfree(sbi);
dcc7dae3 3251 goto out_free_orig;
705895b6 3252 }
ac27a0ec 3253 sb->s_fs_info = sbi;
2c0544b2 3254 sbi->s_sb = sb;
ac27a0ec 3255 sbi->s_mount_opt = 0;
08cefc7a
EB		 3256 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3257 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
240799cd 3258 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3259 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3260 if (sb->s_bdev->bd_part)
3261 sbi->s_sectors_written_start =
3262 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3263
9f6200bb
TT		 3264 /* Cleanup superblock name */
3265 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3266 *cp = '!';
3267
dcc7dae3 3268 ret = -EINVAL;
617ba13b 3269 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3270 if (!blocksize) {
b31e1552 3271 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3272 goto out_fail;
3273 }
3274
3275 /*
617ba13b 3276 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3277 * block sizes. We need to calculate the offset from buffer start.
3278 */
617ba13b 3279 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3280 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3281 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3282 } else {
70bbb3e0 3283 logical_sb_block = sb_block;
ac27a0ec
DK		 3284 }
3285
70bbb3e0 3286 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3287 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3288 goto out_fail;
3289 }
3290 /*
3291 * Note: s_es must be initialized as soon as possible because
617ba13b 3292 * some ext4 macro-instructions depend on its value
ac27a0ec 3293 */
2716b802 3294 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3295 sbi->s_es = es;
3296 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3297 if (sb->s_magic != EXT4_SUPER_MAGIC)
3298 goto cantfind_ext4;
afc32f7e 3299 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3300
feb0ab32
DW		 3301 /* Warn if metadata_csum and gdt_csum are both set. */
3302 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3303 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3304 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3305 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3306 "redundant flags; please run fsck.");
3307
d25425f8
DW		 3308 /* Check for a known checksum algorithm */
3309 if (!ext4_verify_csum_type(sb, es)) {
3310 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3311 "unknown checksum algorithm.");
3312 silent = 1;
3313 goto cantfind_ext4;
3314 }
3315
0441984a
DW		 3316 /* Load the checksum driver */
3317 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3318 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3319 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3320 if (IS_ERR(sbi->s_chksum_driver)) {
3321 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3322 ret = PTR_ERR(sbi->s_chksum_driver);
3323 sbi->s_chksum_driver = NULL;
3324 goto failed_mount;
3325 }
3326 }
3327
a9c47317
DW		 3328 /* Check superblock checksum */
3329 if (!ext4_superblock_csum_verify(sb, es)) {
3330 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3331 "invalid superblock checksum. Run e2fsck?");
3332 silent = 1;
3333 goto cantfind_ext4;
3334 }
3335
3336 /* Precompute checksum seed for all metadata */
3337 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3338 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3339 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3340 sizeof(es->s_uuid));
3341
ac27a0ec
DK		 3342 /* Set defaults before we parse the mount options */
3343 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3344 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3345 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3346 set_opt(sb, DEBUG);
87f26807 3347 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3348 set_opt(sb, GRPID);
617ba13b 3349 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3350 set_opt(sb, NO_UID32);
ea663336 3351 /* xattr user namespace & acls are now defaulted on */
03010a33 3352#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3353 set_opt(sb, XATTR_USER);
2e7842b8 3354#endif
03010a33 3355#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3356 set_opt(sb, POSIX_ACL);
2e7842b8 3357#endif
6fd7a467 3358 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3359 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3360 set_opt(sb, JOURNAL_DATA);
617ba13b 3361 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3362 set_opt(sb, ORDERED_DATA);
617ba13b 3363 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3364 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3365
3366 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3367 set_opt(sb, ERRORS_PANIC);
bb4f397a 3368 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3369 set_opt(sb, ERRORS_CONT);
bb4f397a 3370 else
fd8c37ec 3371 set_opt(sb, ERRORS_RO);
8b67f04a 3372 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3373 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3374 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3375 set_opt(sb, DISCARD);
ac27a0ec 3376
08cefc7a
EB		 3377 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3378 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3379 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3380 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3381 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3382
8b67f04a 3383 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3384 set_opt(sb, BARRIER);
ac27a0ec 3385
dd919b98
AK		 3386 /*
3387 * enable delayed allocation by default
3388 * Use -o nodelalloc to turn it off
3389 */
8b67f04a
TT		 3390 if (!IS_EXT3_SB(sb) &&
3391 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3392 set_opt(sb, DELALLOC);
dd919b98 3393
51ce6511
LC		 3394 /*
3395 * set default s_li_wait_mult for lazyinit, for the case there is
3396 * no mount option specified.
3397 */
3398 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3399
8b67f04a 3400 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3401 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3402 ext4_msg(sb, KERN_WARNING,
3403 "failed to parse options in superblock: %s",
3404 sbi->s_es->s_mount_opts);
3405 }
5a916be1 3406 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3407 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3408 &journal_ioprio, 0))
ac27a0ec
DK		 3409 goto failed_mount;
3410
56889787
TT		 3411 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3412 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3413 "with data=journal disables delayed "
3414 "allocation and O_DIRECT support!\n");
3415 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3416 ext4_msg(sb, KERN_ERR, "can't mount with "
3417 "both data=journal and delalloc");
3418 goto failed_mount;
3419 }
3420 if (test_opt(sb, DIOREAD_NOLOCK)) {
3421 ext4_msg(sb, KERN_ERR, "can't mount with "
3422 "both data=journal and delalloc");
3423 goto failed_mount;
3424 }
3425 if (test_opt(sb, DELALLOC))
3426 clear_opt(sb, DELALLOC);
3427 }
3428
3429 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3430 if (test_opt(sb, DIOREAD_NOLOCK)) {
3431 if (blocksize < PAGE_SIZE) {
3432 ext4_msg(sb, KERN_ERR, "can't mount with "
3433 "dioread_nolock if block size != PAGE_SIZE");
3434 goto failed_mount;
3435 }
3436 }
3437
ac27a0ec 3438 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3439 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3440
617ba13b
MC		 3441 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3442 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3443 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3444 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3445 ext4_msg(sb, KERN_WARNING,
3446 "feature flags set on rev 0 fs, "
3447 "running e2fsck is recommended");
469108ff 3448
2035e776
TT		 3449 if (IS_EXT2_SB(sb)) {
3450 if (ext2_feature_set_ok(sb))
3451 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3452 "using the ext4 subsystem");
3453 else {
3454 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3455 "to feature incompatibilities");
3456 goto failed_mount;
3457 }
3458 }
3459
3460 if (IS_EXT3_SB(sb)) {
3461 if (ext3_feature_set_ok(sb))
3462 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3463 "using the ext4 subsystem");
3464 else {
3465 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3466 "to feature incompatibilities");
3467 goto failed_mount;
3468 }
3469 }
3470
ac27a0ec
DK		 3471 /*
3472 * Check feature flags regardless of the revision level, since we
3473 * previously didn't change the revision level when setting the flags,
3474 * so there is a chance incompat flags are set on a rev 0 filesystem.
3475 */
a13fb1a4 3476 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3477 goto failed_mount;
a13fb1a4 3478
617ba13b
MC		 3479 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3480 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3481 ext4_msg(sb, KERN_ERR,
3482 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3483 goto failed_mount;
3484 }
3485
ac27a0ec 3486 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3487 /* Validate the filesystem blocksize */
3488 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3489 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3490 blocksize);
ac27a0ec
DK		 3491 goto failed_mount;
3492 }
3493
2b2d6d01 3494 brelse(bh);
70bbb3e0
AM		 3495 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3496 offset = do_div(logical_sb_block, blocksize);
3497 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3498 if (!bh) {
b31e1552
ES		 3499 ext4_msg(sb, KERN_ERR,
3500 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3501 goto failed_mount;
3502 }
2716b802 3503 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3504 sbi->s_es = es;
617ba13b 3505 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3506 ext4_msg(sb, KERN_ERR,
3507 "Magic mismatch, very weird!");
ac27a0ec
DK		 3508 goto failed_mount;
3509 }
3510 }
3511
a13fb1a4
ES		 3512 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3513 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3514 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3515 has_huge_files);
3516 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3517
617ba13b
MC		 3518 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3519 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3520 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3521 } else {
3522 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3523 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3524 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3525 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3526 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3527 ext4_msg(sb, KERN_ERR,
3528 "unsupported inode size: %d",
2b2d6d01 3529 sbi->s_inode_size);
ac27a0ec
DK		 3530 goto failed_mount;
3531 }
ef7f3835
KS		 3532 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3533 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3534 }
0b8e58a1 3535
0d1ee42f
AR		 3536 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3537 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3538 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3539 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3540 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3541 ext4_msg(sb, KERN_ERR,
3542 "unsupported descriptor size %lu",
0d1ee42f
AR		 3543 sbi->s_desc_size);
3544 goto failed_mount;
3545 }
3546 } else
3547 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3548
ac27a0ec 3549 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3550 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3551 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3552 goto cantfind_ext4;
0b8e58a1 3553
617ba13b 3554 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3555 if (sbi->s_inodes_per_block == 0)
617ba13b 3556 goto cantfind_ext4;
ac27a0ec
DK		 3557 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3558 sbi->s_inodes_per_block;
0d1ee42f 3559 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3560 sbi->s_sbh = bh;
3561 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3562 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3563 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3564
2b2d6d01 3565 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3566 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3567 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3568 i = le32_to_cpu(es->s_flags);
3569 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3570 sbi->s_hash_unsigned = 3;
3571 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3572#ifdef __CHAR_UNSIGNED__
3573 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3574 sbi->s_hash_unsigned = 3;
3575#else
3576 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3577#endif
f99b2589 3578 }
ac27a0ec 3579
281b5995
TT		 3580 /* Handle clustersize */
3581 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3582 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3583 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3584 if (has_bigalloc) {
3585 if (clustersize < blocksize) {
3586 ext4_msg(sb, KERN_ERR,
3587 "cluster size (%d) smaller than "
3588 "block size (%d)", clustersize, blocksize);
3589 goto failed_mount;
3590 }
3591 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3592 le32_to_cpu(es->s_log_block_size);
3593 sbi->s_clusters_per_group =
3594 le32_to_cpu(es->s_clusters_per_group);
3595 if (sbi->s_clusters_per_group > blocksize * 8) {
3596 ext4_msg(sb, KERN_ERR,
3597 "#clusters per group too big: %lu",
3598 sbi->s_clusters_per_group);
3599 goto failed_mount;
3600 }
3601 if (sbi->s_blocks_per_group !=
3602 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3603 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3604 "clusters per group (%lu) inconsistent",
3605 sbi->s_blocks_per_group,
3606 sbi->s_clusters_per_group);
3607 goto failed_mount;
3608 }
3609 } else {
3610 if (clustersize != blocksize) {
3611 ext4_warning(sb, "fragment/cluster size (%d) != "
3612 "block size (%d)", clustersize,
3613 blocksize);
3614 clustersize = blocksize;
3615 }
3616 if (sbi->s_blocks_per_group > blocksize * 8) {
3617 ext4_msg(sb, KERN_ERR,
3618 "#blocks per group too big: %lu",
3619 sbi->s_blocks_per_group);
3620 goto failed_mount;
3621 }
3622 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3623 sbi->s_cluster_bits = 0;
ac27a0ec 3624 }
281b5995
TT		 3625 sbi->s_cluster_ratio = clustersize / blocksize;
3626
ac27a0ec 3627 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3628 ext4_msg(sb, KERN_ERR,
3629 "#inodes per group too big: %lu",
2b2d6d01 3630 sbi->s_inodes_per_group);
ac27a0ec
DK		 3631 goto failed_mount;
3632 }
3633
bf43d84b
ES		 3634 /*
3635 * Test whether we have more sectors than will fit in sector_t,
3636 * and whether the max offset is addressable by the page cache.
3637 */
5a9ae68a 3638 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3639 ext4_blocks_count(es));
5a9ae68a 3640 if (err) {
b31e1552 3641 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3642 " too large to mount safely on this system");
ac27a0ec 3643 if (sizeof(sector_t) < 8)
90c699a9 3644 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3645 ret = err;
ac27a0ec
DK		 3646 goto failed_mount;
3647 }
3648
617ba13b
MC		 3649 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3650 goto cantfind_ext4;
e7c95593 3651
0f2ddca6
FTN		 3652 /* check blocks count against device size */
3653 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3654 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3655 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3656 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3657 ext4_blocks_count(es), blocks_count);
3658 goto failed_mount;
3659 }
3660
0b8e58a1
AD		 3661 /*
3662 * It makes no sense for the first data block to be beyond the end
3663 * of the filesystem.
3664 */
3665 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3666 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3667 "block %u is beyond end of filesystem (%llu)",
3668 le32_to_cpu(es->s_first_data_block),
3669 ext4_blocks_count(es));
e7c95593
ES		 3670 goto failed_mount;
3671 }
bd81d8ee
LV		 3672 blocks_count = (ext4_blocks_count(es) -
3673 le32_to_cpu(es->s_first_data_block) +
3674 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3675 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3676 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3677 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3678 "(block count %llu, first data block %u, "
b31e1552 3679 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3680 ext4_blocks_count(es),
3681 le32_to_cpu(es->s_first_data_block),
3682 EXT4_BLOCKS_PER_GROUP(sb));
3683 goto failed_mount;
3684 }
bd81d8ee 3685 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3686 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3687 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3688 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3689 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3690 sbi->s_group_desc = ext4_kvmalloc(db_count *
3691 sizeof(struct buffer_head *),
3692 GFP_KERNEL);
ac27a0ec 3693 if (sbi->s_group_desc == NULL) {
b31e1552 3694 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3695 ret = -ENOMEM;
ac27a0ec
DK		 3696 goto failed_mount;
3697 }
3698
9f6200bb
TT		 3699 if (ext4_proc_root)
3700 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3701
66acdcf4
TT		 3702 if (sbi->s_proc)
3703 proc_create_data("options", S_IRUGO, sbi->s_proc,
3704 &ext4_seq_options_fops, sb);
3705
705895b6 3706 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3707
3708 for (i = 0; i < db_count; i++) {
70bbb3e0 3709 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3710 sbi->s_group_desc[i] = sb_bread(sb, block);
3711 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3712 ext4_msg(sb, KERN_ERR,
3713 "can't read group descriptor %d", i);
ac27a0ec
DK		 3714 db_count = i;
3715 goto failed_mount2;
3716 }
3717 }
bfff6873 3718 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3719 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3720 goto failed_mount2;
3721 }
772cb7c8
JS		 3722 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3723 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3724 ext4_msg(sb, KERN_ERR,
3725 "unable to initialize "
3726 "flex_bg meta info!");
772cb7c8
JS		 3727 goto failed_mount2;
3728 }
3729
ac27a0ec
DK		 3730 sbi->s_gdb_count = db_count;
3731 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3732 spin_lock_init(&sbi->s_next_gen_lock);
3733
04496411
TM		 3734 init_timer(&sbi->s_err_report);
3735 sbi->s_err_report.function = print_daily_error_info;
3736 sbi->s_err_report.data = (unsigned long) sb;
3737
57042651 3738 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3739 ext4_count_free_clusters(sb));
ce7e010a
TT		 3740 if (!err) {
3741 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3742 ext4_count_free_inodes(sb));
3743 }
3744 if (!err) {
3745 err = percpu_counter_init(&sbi->s_dirs_counter,
3746 ext4_count_dirs(sb));
3747 }
3748 if (!err) {
57042651 3749 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3750 }
3751 if (err) {
3752 ext4_msg(sb, KERN_ERR, "insufficient memory");
2cde417d 3753 ret = err;
ce7e010a
TT		 3754 goto failed_mount3;
3755 }
3756
c9de560d 3757 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3758 sbi->s_max_writeback_mb_bump = 128;
67a5da56 3759 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3760
ac27a0ec
DK		 3761 /*
3762 * set up enough so that it can read an inode
3763 */
9ca92389
TT		 3764 if (!test_opt(sb, NOLOAD) &&
3765 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3766 sb->s_op = &ext4_sops;
3767 else
3768 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3769 sb->s_export_op = &ext4_export_ops;
3770 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3771#ifdef CONFIG_QUOTA
617ba13b
MC		 3772 sb->s_qcop = &ext4_qctl_operations;
3773 sb->dq_op = &ext4_quota_operations;
7c319d32
AK		 3774
3775 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
3776 /* Use qctl operations for hidden quota files. */
3777 sb->s_qcop = &ext4_qctl_sysfile_operations;
3778 }
ac27a0ec 3779#endif
f2fa2ffc
AK		 3780 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3781
ac27a0ec 3782 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3783 mutex_init(&sbi->s_orphan_lock);
8f82f840 3784 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3785
3786 sb->s_root = NULL;
3787
3788 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3789 EXT4_HAS_INCOMPAT_FEATURE(sb,
3790 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3791
c5e06d10
JL		 3792 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3793 !(sb->s_flags & MS_RDONLY))
3794 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3795 goto failed_mount3;
3796
ac27a0ec
DK		 3797 /*
3798 * The first inode we look at is the journal inode. Don't try
3799 * root first: it may be modified in the journal!
3800 */
3801 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3802 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3803 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3804 goto failed_mount3;
0390131b
FM		 3805 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3806 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3807 ext4_msg(sb, KERN_ERR, "required journal recovery "
3808 "suppressed and not mounted read-only");
744692dc 3809 goto failed_mount_wq;
ac27a0ec 3810 } else {
fd8c37ec 3811 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3812 sbi->s_journal = NULL;
3813 needs_recovery = 0;
3814 goto no_journal;
ac27a0ec
DK		 3815 }
3816
f32aaf2d 3817 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3818 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3819 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3820 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3821 goto failed_mount_wq;
eb40a09c
JS		 3822 }
3823
25ed6e8a
DW		 3824 if (!set_journal_csum_feature_set(sb)) {
3825 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3826 "feature set");
3827 goto failed_mount_wq;
d4da6c9c 3828 }
818d276c 3829
ac27a0ec
DK		 3830 /* We have now updated the journal if required, so we can
3831 * validate the data journaling mode. */
3832 switch (test_opt(sb, DATA_FLAGS)) {
3833 case 0:
3834 /* No mode set, assume a default based on the journal
63f57933
AM		 3835 * capabilities: ORDERED_DATA if the journal can
3836 * cope, else JOURNAL_DATA
3837 */
dab291af
MC		 3838 if (jbd2_journal_check_available_features
3839 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3840 set_opt(sb, ORDERED_DATA);
ac27a0ec 3841 else
fd8c37ec 3842 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3843 break;
3844
617ba13b
MC		 3845 case EXT4_MOUNT_ORDERED_DATA:
3846 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3847 if (!jbd2_journal_check_available_features
3848 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3849 ext4_msg(sb, KERN_ERR, "Journal does not support "
3850 "requested data journaling mode");
744692dc 3851 goto failed_mount_wq;
ac27a0ec
DK		 3852 }
3853 default:
3854 break;
3855 }
b3881f74 3856 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3857
18aadd47
BJ		 3858 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3859
ce7e010a
TT		 3860 /*
3861 * The journal may have updated the bg summary counts, so we
3862 * need to update the global counters.
3863 */
57042651 3864 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3865 ext4_count_free_clusters(sb));
ce7e010a
TT		 3866 percpu_counter_set(&sbi->s_freeinodes_counter,
3867 ext4_count_free_inodes(sb));
3868 percpu_counter_set(&sbi->s_dirs_counter,
3869 ext4_count_dirs(sb));
57042651 3870 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3871
ce7e010a 3872no_journal:
952fc18e
TT		 3873 /*
3874 * Get the # of file system overhead blocks from the
3875 * superblock if present.
3876 */
3877 if (es->s_overhead_clusters)
3878 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3879 else {
3880 ret = ext4_calculate_overhead(sb);
3881 if (ret)
3882 goto failed_mount_wq;
3883 }
3884
fd89d5f2
TH		 3885 /*
3886 * The maximum number of concurrent works can be high and
3887 * concurrency isn't really necessary. Limit it to 1.
3888 */
3889 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3890 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3891 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3892 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3893 goto failed_mount_wq;
3894 }
3895
ac27a0ec 3896 /*
dab291af 3897 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3898 * so we can safely mount the rest of the filesystem now.
3899 */
3900
1d1fe1ee
DH		 3901 root = ext4_iget(sb, EXT4_ROOT_INO);
3902 if (IS_ERR(root)) {
b31e1552 3903 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3904 ret = PTR_ERR(root);
32a9bb57 3905 root = NULL;
ac27a0ec
DK		 3906 goto failed_mount4;
3907 }
3908 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3909 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3910 iput(root);
ac27a0ec
DK		 3911 goto failed_mount4;
3912 }
48fde701 3913 sb->s_root = d_make_root(root);
1d1fe1ee 3914 if (!sb->s_root) {
b31e1552 3915 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3916 ret = -ENOMEM;
3917 goto failed_mount4;
3918 }
ac27a0ec 3919
7e84b621
ES		 3920 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3921 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3922
3923 /* determine the minimum size of new large inodes, if present */
3924 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3925 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3926 EXT4_GOOD_OLD_INODE_SIZE;
3927 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3928 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3929 if (sbi->s_want_extra_isize <
3930 le16_to_cpu(es->s_want_extra_isize))
3931 sbi->s_want_extra_isize =
3932 le16_to_cpu(es->s_want_extra_isize);
3933 if (sbi->s_want_extra_isize <
3934 le16_to_cpu(es->s_min_extra_isize))
3935 sbi->s_want_extra_isize =
3936 le16_to_cpu(es->s_min_extra_isize);
3937 }
3938 }
3939 /* Check if enough inode space is available */
3940 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3941 sbi->s_inode_size) {
3942 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3943 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3944 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3945 "available");
ef7f3835
KS		 3946 }
3947
6fd058f7
TT		 3948 err = ext4_setup_system_zone(sb);
3949 if (err) {
b31e1552 3950 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3951 "zone (%d)", err);
94bf608a 3952 goto failed_mount4a;
6fd058f7
TT		 3953 }
3954
c2774d84 3955 ext4_ext_init(sb);
9d99012f 3956 err = ext4_mb_init(sb);
c2774d84 3957 if (err) {
421f91d2 3958 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3959 err);
dcf2d804 3960 goto failed_mount5;
c2774d84
AK		 3961 }
3962
bfff6873
LC		 3963 err = ext4_register_li_request(sb, first_not_zeroed);
3964 if (err)
dcf2d804 3965 goto failed_mount6;
bfff6873 3966
3197ebdb
TT		 3967 sbi->s_kobj.kset = ext4_kset;
3968 init_completion(&sbi->s_kobj_unregister);
3969 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3970 "%s", sb->s_id);
dcf2d804
TM		 3971 if (err)
3972 goto failed_mount7;
3197ebdb 3973
617ba13b
MC		 3974 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3975 ext4_orphan_cleanup(sb, es);
3976 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3977 if (needs_recovery) {
b31e1552 3978 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3979 ext4_mark_recovery_complete(sb, es);
3980 }
3981 if (EXT4_SB(sb)->s_journal) {
3982 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3983 descr = " journalled data mode";
3984 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3985 descr = " ordered data mode";
3986 else
3987 descr = " writeback data mode";
3988 } else
3989 descr = "out journal";
3990
7c319d32
AK		 3991#ifdef CONFIG_QUOTA
3992 /* Enable quota usage during mount. */
3993 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
3994 !(sb->s_flags & MS_RDONLY)) {
3995 ret = ext4_enable_quotas(sb);
3996 if (ret)
3997 goto failed_mount7;
3998 }
3999#endif /* CONFIG_QUOTA */
4000
d4c402d9 4001 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4002 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4003 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4004
66e61a9e
TT		 4005 if (es->s_error_count)
4006 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4007
d4c402d9 4008 kfree(orig_data);
ac27a0ec
DK		 4009 return 0;
4010
617ba13b 4011cantfind_ext4:
ac27a0ec 4012 if (!silent)
b31e1552 4013 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4014 goto failed_mount;
4015
dcf2d804
TM		 4016failed_mount7:
4017 ext4_unregister_li_request(sb);
4018failed_mount6:
dcf2d804 4019 ext4_mb_release(sb);
94bf608a
AV		 4020failed_mount5:
4021 ext4_ext_release(sb);
dcf2d804 4022 ext4_release_system_zone(sb);
94bf608a
AV		 4023failed_mount4a:
4024 dput(sb->s_root);
32a9bb57 4025 sb->s_root = NULL;
94bf608a 4026failed_mount4:
b31e1552 4027 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4028 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4029failed_mount_wq:
0390131b
FM		 4030 if (sbi->s_journal) {
4031 jbd2_journal_destroy(sbi->s_journal);
4032 sbi->s_journal = NULL;
4033 }
ac27a0ec 4034failed_mount3:
04496411 4035 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4036 if (sbi->s_flex_groups)
4037 ext4_kvfree(sbi->s_flex_groups);
57042651 4038 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4039 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4040 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4041 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 4042 if (sbi->s_mmp_tsk)
4043 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4044failed_mount2:
4045 for (i = 0; i < db_count; i++)
4046 brelse(sbi->s_group_desc[i]);
f18a5f21 4047 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4048failed_mount:
0441984a
DW		 4049 if (sbi->s_chksum_driver)
4050 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4051 if (sbi->s_proc) {
66acdcf4 4052 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4053 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4054 }
ac27a0ec
DK		 4055#ifdef CONFIG_QUOTA
4056 for (i = 0; i < MAXQUOTAS; i++)
4057 kfree(sbi->s_qf_names[i]);
4058#endif
617ba13b 4059 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4060 brelse(bh);
4061out_fail:
4062 sb->s_fs_info = NULL;
f6830165 4063 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4064 kfree(sbi);
dcc7dae3 4065out_free_orig:
d4c402d9 4066 kfree(orig_data);
1d1fe1ee 4067 return ret;
ac27a0ec
DK		 4068}
4069
4070/*
4071 * Setup any per-fs journal parameters now. We'll do this both on
4072 * initial mount, once the journal has been initialised but before we've
4073 * done any recovery; and again on any subsequent remount.
4074 */
617ba13b 4075static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4076{
617ba13b 4077 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4078
30773840
TT		 4079 journal->j_commit_interval = sbi->s_commit_interval;
4080 journal->j_min_batch_time = sbi->s_min_batch_time;
4081 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4082
a931da6a 4083 write_lock(&journal->j_state_lock);
ac27a0ec 4084 if (test_opt(sb, BARRIER))
dab291af 4085 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4086 else
dab291af 4087 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4088 if (test_opt(sb, DATA_ERR_ABORT))
4089 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4090 else
4091 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4092 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4093}
4094
617ba13b 4095static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4096 unsigned int journal_inum)
4097{
4098 struct inode *journal_inode;
4099 journal_t *journal;
4100
0390131b
FM		 4101 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4102
ac27a0ec
DK		 4103 /* First, test for the existence of a valid inode on disk. Bad
4104 * things happen if we iget() an unused inode, as the subsequent
4105 * iput() will try to delete it. */
4106
1d1fe1ee
DH		 4107 journal_inode = ext4_iget(sb, journal_inum);
4108 if (IS_ERR(journal_inode)) {
b31e1552 4109 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4110 return NULL;
4111 }
4112 if (!journal_inode->i_nlink) {
4113 make_bad_inode(journal_inode);
4114 iput(journal_inode);
b31e1552 4115 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4116 return NULL;
4117 }
4118
e5f8eab8 4119 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4120 journal_inode, journal_inode->i_size);
1d1fe1ee 4121 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4122 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4123 iput(journal_inode);
4124 return NULL;
4125 }
4126
dab291af 4127 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4128 if (!journal) {
b31e1552 4129 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4130 iput(journal_inode);
4131 return NULL;
4132 }
4133 journal->j_private = sb;
617ba13b 4134 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4135 return journal;
4136}
4137
617ba13b 4138static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4139 dev_t j_dev)
4140{
2b2d6d01 4141 struct buffer_head *bh;
ac27a0ec 4142 journal_t *journal;
617ba13b
MC		 4143 ext4_fsblk_t start;
4144 ext4_fsblk_t len;
ac27a0ec 4145 int hblock, blocksize;
617ba13b 4146 ext4_fsblk_t sb_block;
ac27a0ec 4147 unsigned long offset;
2b2d6d01 4148 struct ext4_super_block *es;
ac27a0ec
DK		 4149 struct block_device *bdev;
4150
0390131b
FM		 4151 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4152
b31e1552 4153 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4154 if (bdev == NULL)
4155 return NULL;
4156
ac27a0ec 4157 blocksize = sb->s_blocksize;
e1defc4f 4158 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4159 if (blocksize < hblock) {
b31e1552
ES		 4160 ext4_msg(sb, KERN_ERR,
4161 "blocksize too small for journal device");
ac27a0ec
DK		 4162 goto out_bdev;
4163 }
4164
617ba13b
MC		 4165 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4166 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4167 set_blocksize(bdev, blocksize);
4168 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4169 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4170 "external journal");
ac27a0ec
DK		 4171 goto out_bdev;
4172 }
4173
2716b802 4174 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4175 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4176 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4177 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4178 ext4_msg(sb, KERN_ERR, "external journal has "
4179 "bad superblock");
ac27a0ec
DK		 4180 brelse(bh);
4181 goto out_bdev;
4182 }
4183
617ba13b 4184 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4185 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4186 brelse(bh);
4187 goto out_bdev;
4188 }
4189
bd81d8ee 4190 len = ext4_blocks_count(es);
ac27a0ec
DK		 4191 start = sb_block + 1;
4192 brelse(bh); /* we're done with the superblock */
4193
dab291af 4194 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4195 start, len, blocksize);
4196 if (!journal) {
b31e1552 4197 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4198 goto out_bdev;
4199 }
4200 journal->j_private = sb;
4201 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4202 wait_on_buffer(journal->j_sb_buffer);
4203 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4204 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4205 goto out_journal;
4206 }
4207 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4208 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4209 "user (unsupported) - %d",
ac27a0ec
DK		 4210 be32_to_cpu(journal->j_superblock->s_nr_users));
4211 goto out_journal;
4212 }
617ba13b
MC		 4213 EXT4_SB(sb)->journal_bdev = bdev;
4214 ext4_init_journal_params(sb, journal);
ac27a0ec 4215 return journal;
0b8e58a1 4216
ac27a0ec 4217out_journal:
dab291af 4218 jbd2_journal_destroy(journal);
ac27a0ec 4219out_bdev:
617ba13b 4220 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4221 return NULL;
4222}
4223
617ba13b
MC		 4224static int ext4_load_journal(struct super_block *sb,
4225 struct ext4_super_block *es,
ac27a0ec
DK		 4226 unsigned long journal_devnum)
4227{
4228 journal_t *journal;
4229 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4230 dev_t journal_dev;
4231 int err = 0;
4232 int really_read_only;
4233
0390131b
FM		 4234 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4235
ac27a0ec
DK		 4236 if (journal_devnum &&
4237 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4238 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4239 "numbers have changed");
ac27a0ec
DK		 4240 journal_dev = new_decode_dev(journal_devnum);
4241 } else
4242 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4243
4244 really_read_only = bdev_read_only(sb->s_bdev);
4245
4246 /*
4247 * Are we loading a blank journal or performing recovery after a
4248 * crash? For recovery, we need to check in advance whether we
4249 * can get read-write access to the device.
4250 */
617ba13b 4251 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4252 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4253 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4254 "required on readonly filesystem");
ac27a0ec 4255 if (really_read_only) {
b31e1552
ES		 4256 ext4_msg(sb, KERN_ERR, "write access "
4257 "unavailable, cannot proceed");
ac27a0ec
DK		 4258 return -EROFS;
4259 }
b31e1552
ES		 4260 ext4_msg(sb, KERN_INFO, "write access will "
4261 "be enabled during recovery");
ac27a0ec
DK		 4262 }
4263 }
4264
4265 if (journal_inum && journal_dev) {
b31e1552
ES		 4266 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4267 "and inode journals!");
ac27a0ec
DK		 4268 return -EINVAL;
4269 }
4270
4271 if (journal_inum) {
617ba13b 4272 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4273 return -EINVAL;
4274 } else {
617ba13b 4275 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4276 return -EINVAL;
4277 }
4278
90576c0b 4279 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4280 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4281
617ba13b 4282 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4283 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4284 if (!err) {
4285 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4286 if (save)
4287 memcpy(save, ((char *) es) +
4288 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4289 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4290 if (save)
4291 memcpy(((char *) es) + EXT4_S_ERR_START,
4292 save, EXT4_S_ERR_LEN);
4293 kfree(save);
4294 }
ac27a0ec
DK		 4295
4296 if (err) {
b31e1552 4297 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4298 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4299 return err;
4300 }
4301
617ba13b
MC		 4302 EXT4_SB(sb)->s_journal = journal;
4303 ext4_clear_journal_err(sb, es);
ac27a0ec 4304
c41303ce 4305 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4306 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4307 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4308
4309 /* Make sure we flush the recovery flag to disk. */
e2d67052 4310 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4311 }
4312
4313 return 0;
4314}
4315
e2d67052 4316static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4317{
e2d67052 4318 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4319 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4320 int error = 0;
ac27a0ec 4321
7c2e7087 4322 if (!sbh || block_device_ejected(sb))
c4be0c1d 4323 return error;
914258bf
TT		 4324 if (buffer_write_io_error(sbh)) {
4325 /*
4326 * Oh, dear. A previous attempt to write the
4327 * superblock failed. This could happen because the
4328 * USB device was yanked out. Or it could happen to
4329 * be a transient write error and maybe the block will
4330 * be remapped. Nothing we can do but to retry the
4331 * write and hope for the best.
4332 */
b31e1552
ES		 4333 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4334 "superblock detected");
914258bf
TT		 4335 clear_buffer_write_io_error(sbh);
4336 set_buffer_uptodate(sbh);
4337 }
71290b36
TT		 4338 /*
4339 * If the file system is mounted read-only, don't update the
4340 * superblock write time. This avoids updating the superblock
4341 * write time when we are mounting the root file system
4342 * read/only but we need to replay the journal; at that point,
4343 * for people who are east of GMT and who make their clock
4344 * tick in localtime for Windows bug-for-bug compatibility,
4345 * the clock is set in the future, and this will cause e2fsck
4346 * to complain and force a full file system check.
4347 */
4348 if (!(sb->s_flags & MS_RDONLY))
4349 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4350 if (sb->s_bdev->bd_part)
4351 es->s_kbytes_written =
4352 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4353 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4354 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4355 else
4356 es->s_kbytes_written =
4357 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4358 ext4_free_blocks_count_set(es,
4359 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4360 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4361 es->s_free_inodes_count =
4362 cpu_to_le32(percpu_counter_sum_positive(
4363 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4364 BUFFER_TRACE(sbh, "marking dirty");
a9c47317 4365 ext4_superblock_csum_set(sb, es);
ac27a0ec 4366 mark_buffer_dirty(sbh);
914258bf 4367 if (sync) {
c4be0c1d
TS		 4368 error = sync_dirty_buffer(sbh);
4369 if (error)
4370 return error;
4371
4372 error = buffer_write_io_error(sbh);
4373 if (error) {
b31e1552
ES		 4374 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4375 "superblock");
914258bf
TT		 4376 clear_buffer_write_io_error(sbh);
4377 set_buffer_uptodate(sbh);
4378 }
4379 }
c4be0c1d 4380 return error;
ac27a0ec
DK		 4381}
4382
ac27a0ec
DK		 4383/*
4384 * Have we just finished recovery? If so, and if we are mounting (or
4385 * remounting) the filesystem readonly, then we will end up with a
4386 * consistent fs on disk. Record that fact.
4387 */
2b2d6d01
TT		 4388static void ext4_mark_recovery_complete(struct super_block *sb,
4389 struct ext4_super_block *es)
ac27a0ec 4390{
617ba13b 4391 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4392
0390131b
FM		 4393 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4394 BUG_ON(journal != NULL);
4395 return;
4396 }
dab291af 4397 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4398 if (jbd2_journal_flush(journal) < 0)
4399 goto out;
4400
617ba13b 4401 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4402 sb->s_flags & MS_RDONLY) {
617ba13b 4403 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4404 ext4_commit_super(sb, 1);
ac27a0ec 4405 }
7ffe1ea8
HK		 4406
4407out:
dab291af 4408 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4409}
4410
4411/*
4412 * If we are mounting (or read-write remounting) a filesystem whose journal
4413 * has recorded an error from a previous lifetime, move that error to the
4414 * main filesystem now.
4415 */
2b2d6d01
TT		 4416static void ext4_clear_journal_err(struct super_block *sb,
4417 struct ext4_super_block *es)
ac27a0ec
DK		 4418{
4419 journal_t *journal;
4420 int j_errno;
4421 const char *errstr;
4422
0390131b
FM		 4423 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4424
617ba13b 4425 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4426
4427 /*
4428 * Now check for any error status which may have been recorded in the
617ba13b 4429 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4430 */
4431
dab291af 4432 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4433 if (j_errno) {
4434 char nbuf[16];
4435
617ba13b 4436 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4437 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4438 "from previous mount: %s", errstr);
12062ddd 4439 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4440
617ba13b
MC		 4441 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4442 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4443 ext4_commit_super(sb, 1);
ac27a0ec 4444
dab291af 4445 jbd2_journal_clear_err(journal);
d796c52e 4446 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4447 }
4448}
4449
4450/*
4451 * Force the running and committing transactions to commit,
4452 * and wait on the commit.
4453 */
617ba13b 4454int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4455{
4456 journal_t *journal;
0390131b 4457 int ret = 0;
ac27a0ec
DK		 4458
4459 if (sb->s_flags & MS_RDONLY)
4460 return 0;
4461
617ba13b 4462 journal = EXT4_SB(sb)->s_journal;
8e8ad8a5 4463 if (journal)
0390131b 4464 ret = ext4_journal_force_commit(journal);
0390131b 4465
ac27a0ec
DK		 4466 return ret;
4467}
4468
617ba13b 4469static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4470{
14ce0cb4 4471 int ret = 0;
9eddacf9 4472 tid_t target;
8d5d02e6 4473 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4474
9bffad1e 4475 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4476 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4477 /*
4478 * Writeback quota in non-journalled quota case - journalled quota has
4479 * no dirty dquots
4480 */
4481 dquot_writeback_dquots(sb, -1);
8d5d02e6 4482 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4483 if (wait)
8d5d02e6 4484 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4485 }
14ce0cb4 4486 return ret;
ac27a0ec
DK		 4487}
4488
4489/*
4490 * LVM calls this function before a (read-only) snapshot is created. This
4491 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4492 *
4493 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4494 * state independently. It relies on upper layer to stop all data & metadata
4495 * modifications.
ac27a0ec 4496 */
c4be0c1d 4497static int ext4_freeze(struct super_block *sb)
ac27a0ec 4498{
c4be0c1d
TS		 4499 int error = 0;
4500 journal_t *journal;
ac27a0ec 4501
9ca92389
TT		 4502 if (sb->s_flags & MS_RDONLY)
4503 return 0;
ac27a0ec 4504
9ca92389 4505 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4506
9ca92389
TT		 4507 /* Now we set up the journal barrier. */
4508 jbd2_journal_lock_updates(journal);
ac27a0ec 4509
9ca92389
TT		 4510 /*
4511 * Don't clear the needs_recovery flag if we failed to flush
4512 * the journal.
4513 */
4514 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4515 if (error < 0)
4516 goto out;
9ca92389
TT		 4517
4518 /* Journal blocked and flushed, clear needs_recovery flag. */
4519 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4520 error = ext4_commit_super(sb, 1);
6b0310fb 4521out:
8e8ad8a5 4522 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4523 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4524 return error;
ac27a0ec
DK		 4525}
4526
4527/*
4528 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4529 * flag here, even though the filesystem is not technically dirty yet.
4530 */
c4be0c1d 4531static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4532{
9ca92389
TT		 4533 if (sb->s_flags & MS_RDONLY)
4534 return 0;
4535
9ca92389
TT		 4536 /* Reset the needs_recovery flag before the fs is unlocked. */
4537 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4538 ext4_commit_super(sb, 1);
c4be0c1d 4539 return 0;
ac27a0ec
DK		 4540}
4541
673c6100
TT		 4542/*
4543 * Structure to save mount options for ext4_remount's benefit
4544 */
4545struct ext4_mount_options {
4546 unsigned long s_mount_opt;
a2595b8a 4547 unsigned long s_mount_opt2;
08cefc7a
EB		 4548 kuid_t s_resuid;
4549 kgid_t s_resgid;
673c6100
TT		 4550 unsigned long s_commit_interval;
4551 u32 s_min_batch_time, s_max_batch_time;
4552#ifdef CONFIG_QUOTA
4553 int s_jquota_fmt;
4554 char *s_qf_names[MAXQUOTAS];
4555#endif
4556};
4557
2b2d6d01 4558static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4559{
2b2d6d01 4560 struct ext4_super_block *es;
617ba13b 4561 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4562 unsigned long old_sb_flags;
617ba13b 4563 struct ext4_mount_options old_opts;
c79d967d 4564 int enable_quota = 0;
8a266467 4565 ext4_group_t g;
b3881f74 4566 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4567 int err = 0;
ac27a0ec
DK		 4568#ifdef CONFIG_QUOTA
4569 int i;
4570#endif
d4c402d9 4571 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4572
4573 /* Store the original options */
4574 old_sb_flags = sb->s_flags;
4575 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4576 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4577 old_opts.s_resuid = sbi->s_resuid;
4578 old_opts.s_resgid = sbi->s_resgid;
4579 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4580 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4581 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4582#ifdef CONFIG_QUOTA
4583 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4584 for (i = 0; i < MAXQUOTAS; i++)
4585 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4586#endif
b3881f74
TT		 4587 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4588 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4589
4590 /*
4591 * Allow the "check" option to be passed as a remount option.
4592 */
661aa520 4593 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4594 err = -EINVAL;
4595 goto restore_opts;
4596 }
4597
4ab2f15b 4598 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4599 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4600
4601 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4602 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4603
4604 es = sbi->s_es;
4605
b3881f74 4606 if (sbi->s_journal) {
0390131b 4607 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4608 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4609 }
ac27a0ec 4610
661aa520 4611 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4612 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4613 err = -EROFS;
4614 goto restore_opts;
4615 }
4616
4617 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4618 err = dquot_suspend(sb, -1);
4619 if (err < 0)
c79d967d 4620 goto restore_opts;
c79d967d 4621
ac27a0ec
DK		 4622 /*
4623 * First of all, the unconditional stuff we have to do
4624 * to disable replay of the journal when we next remount
4625 */
4626 sb->s_flags |= MS_RDONLY;
4627
4628 /*
4629 * OK, test if we are remounting a valid rw partition
4630 * readonly, and if so set the rdonly flag and then
4631 * mark the partition as valid again.
4632 */
617ba13b
MC		 4633 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4634 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4635 es->s_state = cpu_to_le16(sbi->s_mount_state);
4636
a63c9eb2 4637 if (sbi->s_journal)
0390131b 4638 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4639 } else {
a13fb1a4
ES		 4640 /* Make sure we can mount this feature set readwrite */
4641 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4642 err = -EROFS;
4643 goto restore_opts;
4644 }
8a266467
TT		 4645 /*
4646 * Make sure the group descriptor checksums
0b8e58a1 4647 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4648 */
4649 for (g = 0; g < sbi->s_groups_count; g++) {
4650 struct ext4_group_desc *gdp =
4651 ext4_get_group_desc(sb, g, NULL);
4652
feb0ab32 4653 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4654 ext4_msg(sb, KERN_ERR,
4655 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4656 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4657 le16_to_cpu(gdp->bg_checksum));
4658 err = -EINVAL;
4659 goto restore_opts;
4660 }
4661 }
4662
ead6596b
ES		 4663 /*
4664 * If we have an unprocessed orphan list hanging
4665 * around from a previously readonly bdev mount,
4666 * require a full umount/remount for now.
4667 */
4668 if (es->s_last_orphan) {
b31e1552 4669 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4670 "remount RDWR because of unprocessed "
4671 "orphan inode list. Please "
b31e1552 4672 "umount/remount instead");
ead6596b
ES		 4673 err = -EINVAL;
4674 goto restore_opts;
4675 }
4676
ac27a0ec
DK		 4677 /*
4678 * Mounting a RDONLY partition read-write, so reread
4679 * and store the current valid flag. (It may have
4680 * been changed by e2fsck since we originally mounted
4681 * the partition.)
4682 */
0390131b
FM		 4683 if (sbi->s_journal)
4684 ext4_clear_journal_err(sb, es);
ac27a0ec 4685 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4686 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4687 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4688 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4689 EXT4_FEATURE_INCOMPAT_MMP))
4690 if (ext4_multi_mount_protect(sb,
4691 le64_to_cpu(es->s_mmp_block))) {
4692 err = -EROFS;
4693 goto restore_opts;
4694 }
c79d967d 4695 enable_quota = 1;
ac27a0ec
DK		 4696 }
4697 }
bfff6873
LC		 4698
4699 /*
4700 * Reinitialize lazy itable initialization thread based on
4701 * current settings
4702 */
4703 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4704 ext4_unregister_li_request(sb);
4705 else {
4706 ext4_group_t first_not_zeroed;
4707 first_not_zeroed = ext4_has_uninit_itable(sb);
4708 ext4_register_li_request(sb, first_not_zeroed);
4709 }
4710
6fd058f7 4711 ext4_setup_system_zone(sb);
0390131b 4712 if (sbi->s_journal == NULL)
e2d67052 4713 ext4_commit_super(sb, 1);
0390131b 4714
ac27a0ec
DK		 4715#ifdef CONFIG_QUOTA
4716 /* Release old quota file names */
4717 for (i = 0; i < MAXQUOTAS; i++)
4718 if (old_opts.s_qf_names[i] &&
4719 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4720 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4721 if (enable_quota) {
4722 if (sb_any_quota_suspended(sb))
4723 dquot_resume(sb, -1);
4724 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4725 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4726 err = ext4_enable_quotas(sb);
07724f98 4727 if (err)
7c319d32 4728 goto restore_opts;
7c319d32
AK		 4729 }
4730 }
ac27a0ec 4731#endif
d4c402d9
CW		 4732
4733 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4734 kfree(orig_data);
ac27a0ec 4735 return 0;
0b8e58a1 4736
ac27a0ec
DK		 4737restore_opts:
4738 sb->s_flags = old_sb_flags;
4739 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4740 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4741 sbi->s_resuid = old_opts.s_resuid;
4742 sbi->s_resgid = old_opts.s_resgid;
4743 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4744 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4745 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4746#ifdef CONFIG_QUOTA
4747 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4748 for (i = 0; i < MAXQUOTAS; i++) {
4749 if (sbi->s_qf_names[i] &&
4750 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4751 kfree(sbi->s_qf_names[i]);
4752 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4753 }
4754#endif
d4c402d9 4755 kfree(orig_data);
ac27a0ec
DK		 4756 return err;
4757}
4758
2b2d6d01 4759static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4760{
4761 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4762 struct ext4_sb_info *sbi = EXT4_SB(sb);
4763 struct ext4_super_block *es = sbi->s_es;
952fc18e 4764 ext4_fsblk_t overhead = 0;
960cc398 4765 u64 fsid;
d02a9391 4766 s64 bfree;
ac27a0ec 4767
952fc18e
TT		 4768 if (!test_opt(sb, MINIX_DF))
4769 overhead = sbi->s_overhead;
ac27a0ec 4770
617ba13b 4771 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4772 buf->f_bsize = sb->s_blocksize;
952fc18e 4773 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
57042651
TT		 4774 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4775 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4776 /* prevent underflow in case that few free space is available */
57042651 4777 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4778 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4779 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4780 buf->f_bavail = 0;
4781 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4782 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4783 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4784 fsid = le64_to_cpup((void *)es->s_uuid) ^
4785 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4786 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4787 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4788
ac27a0ec
DK		 4789 return 0;
4790}
4791
0b8e58a1
AD		 4792/* Helper function for writing quotas on sync - we need to start transaction
4793 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4794 * Process 1 Process 2
617ba13b 4795 * ext4_create() quota_sync()
a269eb18 4796 * jbd2_journal_start() write_dquot()
871a2931 4797 * dquot_initialize() down(dqio_mutex)
dab291af 4798 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4799 *
4800 */
4801
4802#ifdef CONFIG_QUOTA
4803
4804static inline struct inode *dquot_to_inode(struct dquot *dquot)
4805{
4806 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4807}
4808
617ba13b 4809static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4810{
4811 int ret, err;
4812 handle_t *handle;
4813 struct inode *inode;
4814
4815 inode = dquot_to_inode(dquot);
617ba13b 4816 handle = ext4_journal_start(inode,
0b8e58a1 4817 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4818 if (IS_ERR(handle))
4819 return PTR_ERR(handle);
4820 ret = dquot_commit(dquot);
617ba13b 4821 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4822 if (!ret)
4823 ret = err;
4824 return ret;
4825}
4826
617ba13b 4827static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4828{
4829 int ret, err;
4830 handle_t *handle;
4831
617ba13b 4832 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4833 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4834 if (IS_ERR(handle))
4835 return PTR_ERR(handle);
4836 ret = dquot_acquire(dquot);
617ba13b 4837 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4838 if (!ret)
4839 ret = err;
4840 return ret;
4841}
4842
617ba13b 4843static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4844{
4845 int ret, err;
4846 handle_t *handle;
4847
617ba13b 4848 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4849 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4850 if (IS_ERR(handle)) {
4851 /* Release dquot anyway to avoid endless cycle in dqput() */
4852 dquot_release(dquot);
ac27a0ec 4853 return PTR_ERR(handle);
9c3013e9 4854 }
ac27a0ec 4855 ret = dquot_release(dquot);
617ba13b 4856 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4857 if (!ret)
4858 ret = err;
4859 return ret;
4860}
4861
617ba13b 4862static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4863{
2c8be6b2 4864 /* Are we journaling quotas? */
617ba13b
MC		 4865 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4866 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4867 dquot_mark_dquot_dirty(dquot);
617ba13b 4868 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4869 } else {
4870 return dquot_mark_dquot_dirty(dquot);
4871 }
4872}
4873
617ba13b 4874static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4875{
4876 int ret, err;
4877 handle_t *handle;
4878
4879 /* Data block + inode block */
617ba13b 4880 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4881 if (IS_ERR(handle))
4882 return PTR_ERR(handle);
4883 ret = dquot_commit_info(sb, type);
617ba13b 4884 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4885 if (!ret)
4886 ret = err;
4887 return ret;
4888}
4889
4890/*
4891 * Turn on quotas during mount time - we need to find
4892 * the quota file and such...
4893 */
617ba13b 4894static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4895{
287a8095
CH		 4896 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4897 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4898}
4899
4900/*
4901 * Standard function to be called on quota_on
4902 */
617ba13b 4903static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4904 struct path *path)
ac27a0ec
DK		 4905{
4906 int err;
ac27a0ec
DK		 4907
4908 if (!test_opt(sb, QUOTA))
4909 return -EINVAL;
0623543b 4910
ac27a0ec 4911 /* Quotafile not on the same filesystem? */
d8c9584e 4912 if (path->dentry->d_sb != sb)
ac27a0ec 4913 return -EXDEV;
0623543b
JK		 4914 /* Journaling quota? */
4915 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4916 /* Quotafile not in fs root? */
f00c9e44 4917 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4918 ext4_msg(sb, KERN_WARNING,
4919 "Quota file not on filesystem root. "
4920 "Journaled quota will not work");
2b2d6d01 4921 }
0623543b
JK		 4922
4923 /*
4924 * When we journal data on quota file, we have to flush journal to see
4925 * all updates to the file when we bypass pagecache...
4926 */
0390131b 4927 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4928 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4929 /*
4930 * We don't need to lock updates but journal_flush() could
4931 * otherwise be livelocked...
4932 */
4933 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4934 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4935 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4936 if (err)
7ffe1ea8 4937 return err;
0623543b
JK		 4938 }
4939
f00c9e44 4940 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4941}
4942
7c319d32
AK		 4943static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4944 unsigned int flags)
4945{
4946 int err;
4947 struct inode *qf_inode;
4948 unsigned long qf_inums[MAXQUOTAS] = {
4949 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4950 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4951 };
4952
4953 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4954
4955 if (!qf_inums[type])
4956 return -EPERM;
4957
4958 qf_inode = ext4_iget(sb, qf_inums[type]);
4959 if (IS_ERR(qf_inode)) {
4960 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4961 return PTR_ERR(qf_inode);
4962 }
4963
4964 err = dquot_enable(qf_inode, type, format_id, flags);
4965 iput(qf_inode);
4966
4967 return err;
4968}
4969
4970/* Enable usage tracking for all quota types. */
4971static int ext4_enable_quotas(struct super_block *sb)
4972{
4973 int type, err = 0;
4974 unsigned long qf_inums[MAXQUOTAS] = {
4975 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4976 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4977 };
4978
4979 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
4980 for (type = 0; type < MAXQUOTAS; type++) {
4981 if (qf_inums[type]) {
4982 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
4983 DQUOT_USAGE_ENABLED);
4984 if (err) {
4985 ext4_warning(sb,
4986 "Failed to enable quota (type=%d) "
4987 "tracking. Please run e2fsck to fix.",
4988 type);
4989 return err;
4990 }
4991 }
4992 }
4993 return 0;
4994}
4995
4996/*
4997 * quota_on function that is used when QUOTA feature is set.
4998 */
4999static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5000 int format_id)
5001{
5002 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5003 return -EINVAL;
5004
5005 /*
5006 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5007 */
5008 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5009}
5010
ca0e05e4
DM		 5011static int ext4_quota_off(struct super_block *sb, int type)
5012{
21f97697
JK		 5013 struct inode *inode = sb_dqopt(sb)->files[type];
5014 handle_t *handle;
5015
87009d86
DM		 5016 /* Force all delayed allocation blocks to be allocated.
5017 * Caller already holds s_umount sem */
5018 if (test_opt(sb, DELALLOC))
ca0e05e4 5019 sync_filesystem(sb);
ca0e05e4 5020
0b268590
AG		 5021 if (!inode)
5022 goto out;
5023
21f97697
JK		 5024 /* Update modification times of quota files when userspace can
5025 * start looking at them */
5026 handle = ext4_journal_start(inode, 1);
5027 if (IS_ERR(handle))
5028 goto out;
5029 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5030 ext4_mark_inode_dirty(handle, inode);
5031 ext4_journal_stop(handle);
5032
5033out:
ca0e05e4
DM		 5034 return dquot_quota_off(sb, type);
5035}
5036
7c319d32
AK		 5037/*
5038 * quota_off function that is used when QUOTA feature is set.
5039 */
5040static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5041{
5042 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5043 return -EINVAL;
5044
5045 /* Disable only the limits. */
5046 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5047}
5048
ac27a0ec
DK		 5049/* Read data from quotafile - avoid pagecache and such because we cannot afford
5050 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5051 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5052 * we don't have to be afraid of races */
617ba13b 5053static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5054 size_t len, loff_t off)
5055{
5056 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5057 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5058 int err = 0;
5059 int offset = off & (sb->s_blocksize - 1);
5060 int tocopy;
5061 size_t toread;
5062 struct buffer_head *bh;
5063 loff_t i_size = i_size_read(inode);
5064
5065 if (off > i_size)
5066 return 0;
5067 if (off+len > i_size)
5068 len = i_size-off;
5069 toread = len;
5070 while (toread > 0) {
5071 tocopy = sb->s_blocksize - offset < toread ?
5072 sb->s_blocksize - offset : toread;
617ba13b 5073 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5074 if (err)
5075 return err;
5076 if (!bh) /* A hole? */
5077 memset(data, 0, tocopy);
5078 else
5079 memcpy(data, bh->b_data+offset, tocopy);
5080 brelse(bh);
5081 offset = 0;
5082 toread -= tocopy;
5083 data += tocopy;
5084 blk++;
5085 }
5086 return len;
5087}
5088
5089/* Write to quotafile (we know the transaction is already started and has
5090 * enough credits) */
617ba13b 5091static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5092 const char *data, size_t len, loff_t off)
5093{
5094 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5095 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5096 int err = 0;
5097 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5098 struct buffer_head *bh;
5099 handle_t *handle = journal_current_handle();
5100
0390131b 5101 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5102 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5103 " cancelled because transaction is not started",
9c3013e9
JK		 5104 (unsigned long long)off, (unsigned long long)len);
5105 return -EIO;
5106 }
67eeb568
DM		 5107 /*
5108 * Since we account only one data block in transaction credits,
5109 * then it is impossible to cross a block boundary.
5110 */
5111 if (sb->s_blocksize - offset < len) {
5112 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5113 " cancelled because not block aligned",
5114 (unsigned long long)off, (unsigned long long)len);
5115 return -EIO;
5116 }
5117
67eeb568
DM		 5118 bh = ext4_bread(handle, inode, blk, 1, &err);
5119 if (!bh)
5120 goto out;
62d2b5f2
JK		 5121 err = ext4_journal_get_write_access(handle, bh);
5122 if (err) {
5123 brelse(bh);
5124 goto out;
ac27a0ec 5125 }
67eeb568
DM		 5126 lock_buffer(bh);
5127 memcpy(bh->b_data+offset, data, len);
5128 flush_dcache_page(bh->b_page);
5129 unlock_buffer(bh);
62d2b5f2 5130 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5131 brelse(bh);
ac27a0ec 5132out:
0b7f7cef 5133 if (err)
ac27a0ec 5134 return err;
67eeb568
DM		 5135 if (inode->i_size < off + len) {
5136 i_size_write(inode, off + len);
617ba13b 5137 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5138 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5139 }
67eeb568 5140 return len;
ac27a0ec
DK		 5141}
5142
5143#endif
5144
152a0836
AV		 5145static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5146 const char *dev_name, void *data)
ac27a0ec 5147{
152a0836 5148 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5149}
5150
37f328eb 5151#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5152static inline void register_as_ext2(void)
5153{
5154 int err = register_filesystem(&ext2_fs_type);
5155 if (err)
5156 printk(KERN_WARNING
5157 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5158}
5159
5160static inline void unregister_as_ext2(void)
5161{
5162 unregister_filesystem(&ext2_fs_type);
5163}
2035e776
TT		 5164
5165static inline int ext2_feature_set_ok(struct super_block *sb)
5166{
5167 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5168 return 0;
5169 if (sb->s_flags & MS_RDONLY)
5170 return 1;
5171 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5172 return 0;
5173 return 1;
5174}
51b7e3c9 5175MODULE_ALIAS("ext2");
24b58424
TT		 5176#else
5177static inline void register_as_ext2(void) { }
5178static inline void unregister_as_ext2(void) { }
2035e776 5179static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5180#endif
5181
37f328eb 5182#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5183static inline void register_as_ext3(void)
5184{
5185 int err = register_filesystem(&ext3_fs_type);
5186 if (err)
5187 printk(KERN_WARNING
5188 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5189}
5190
5191static inline void unregister_as_ext3(void)
5192{
5193 unregister_filesystem(&ext3_fs_type);
5194}
2035e776
TT		 5195
5196static inline int ext3_feature_set_ok(struct super_block *sb)
5197{
5198 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5199 return 0;
5200 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5201 return 0;
5202 if (sb->s_flags & MS_RDONLY)
5203 return 1;
5204 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5205 return 0;
5206 return 1;
5207}
51b7e3c9 5208MODULE_ALIAS("ext3");
24b58424
TT		 5209#else
5210static inline void register_as_ext3(void) { }
5211static inline void unregister_as_ext3(void) { }
2035e776 5212static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5213#endif
5214
03010a33
TT		 5215static struct file_system_type ext4_fs_type = {
5216 .owner = THIS_MODULE,
5217 .name = "ext4",
152a0836 5218 .mount = ext4_mount,
03010a33
TT		 5219 .kill_sb = kill_block_super,
5220 .fs_flags = FS_REQUIRES_DEV,
5221};
5222
8f021222 5223static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5224{
5225 struct ext4_features *ef;
5226 int ret = -ENOMEM;
5227
5228 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5229 if (!ef)
5230 goto out;
5231
5232 ef->f_kobj.kset = ext4_kset;
5233 init_completion(&ef->f_kobj_unregister);
5234 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5235 "features");
5236 if (ret) {
5237 kfree(ef);
5238 goto out;
5239 }
5240
5241 ext4_feat = ef;
5242 ret = 0;
5243out:
5244 return ret;
5245}
5246
8f021222
LC		 5247static void ext4_exit_feat_adverts(void)
5248{
5249 kobject_put(&ext4_feat->f_kobj);
5250 wait_for_completion(&ext4_feat->f_kobj_unregister);
5251 kfree(ext4_feat);
5252}
5253
e9e3bcec
ES		 5254/* Shared across all ext4 file systems */
5255wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5256struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5257
5dabfc78 5258static int __init ext4_init_fs(void)
ac27a0ec 5259{
e9e3bcec 5260 int i, err;
c9de560d 5261
07c0c5d8
AV		 5262 ext4_li_info = NULL;
5263 mutex_init(&ext4_li_mtx);
5264
12e9b892 5265 ext4_check_flag_values();
e9e3bcec
ES		 5266
5267 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5268 mutex_init(&ext4__aio_mutex[i]);
5269 init_waitqueue_head(&ext4__ioend_wq[i]);
5270 }
5271
5dabfc78 5272 err = ext4_init_pageio();
6fd058f7
TT		 5273 if (err)
5274 return err;
5dabfc78 5275 err = ext4_init_system_zone();
bd2d0210 5276 if (err)
d44651d0 5277 goto out6;
3197ebdb 5278 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5279 if (!ext4_kset) {
5280 err = -ENOMEM;
dd68314c 5281 goto out5;
0e376b1e 5282 }
d44651d0 5283 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5284
5285 err = ext4_init_feat_adverts();
dd68314c
TT		 5286 if (err)
5287 goto out4;
857ac889 5288
5dabfc78 5289 err = ext4_init_mballoc();
ac27a0ec 5290 if (err)
6fd058f7 5291 goto out3;
c9de560d 5292
5dabfc78 5293 err = ext4_init_xattr();
c9de560d
AT		 5294 if (err)
5295 goto out2;
ac27a0ec
DK		 5296 err = init_inodecache();
5297 if (err)
5298 goto out1;
24b58424 5299 register_as_ext3();
2035e776 5300 register_as_ext2();
03010a33 5301 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5302 if (err)
5303 goto out;
bfff6873 5304
ac27a0ec
DK		 5305 return 0;
5306out:
24b58424
TT		 5307 unregister_as_ext2();
5308 unregister_as_ext3();
ac27a0ec
DK		 5309 destroy_inodecache();
5310out1:
5dabfc78 5311 ext4_exit_xattr();
c9de560d 5312out2:
5dabfc78 5313 ext4_exit_mballoc();
6fd058f7 5314out3:
8f021222 5315 ext4_exit_feat_adverts();
dd68314c 5316out4:
d44651d0
FJ		 5317 if (ext4_proc_root)
5318 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5319 kset_unregister(ext4_kset);
d44651d0 5320out5:
5dabfc78 5321 ext4_exit_system_zone();
d44651d0 5322out6:
5dabfc78 5323 ext4_exit_pageio();
ac27a0ec
DK		 5324 return err;
5325}
5326
5dabfc78 5327static void __exit ext4_exit_fs(void)
ac27a0ec 5328{
bfff6873 5329 ext4_destroy_lazyinit_thread();
24b58424
TT		 5330 unregister_as_ext2();
5331 unregister_as_ext3();
03010a33 5332 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5333 destroy_inodecache();
5dabfc78
TT		 5334 ext4_exit_xattr();
5335 ext4_exit_mballoc();
8f021222 5336 ext4_exit_feat_adverts();
9f6200bb 5337 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5338 kset_unregister(ext4_kset);
5dabfc78
TT		 5339 ext4_exit_system_zone();
5340 ext4_exit_pageio();
ac27a0ec
DK		 5341}
5342
5343MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5344MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5345MODULE_LICENSE("GPL");
5dabfc78
TT		 5346module_init(ext4_init_fs)
5347module_exit(ext4_exit_fs)
kernel source for telekom puls (alcatel/mediatek)