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ext4: fix overhead calculation used by ext4_statfs()
[linux.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card ([email protected])
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 ([email protected]), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 77static void ext4_write_super(struct super_block *sb);
c4be0c1d 78static int ext4_freeze(struct super_block *sb);
152a0836
AV		 79static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
2035e776
TT		 81static inline int ext2_feature_set_ok(struct super_block *sb);
82static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 83static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 84static void ext4_destroy_lazyinit_thread(void);
85static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 86static void ext4_clear_request_list(void);
ac27a0ec 87
2035e776
TT		 88#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95};
96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
110#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111#else
112#define IS_EXT3_SB(sb) (0)
113#endif
bd81d8ee 114
d25425f8
DW		 115static int ext4_verify_csum_type(struct super_block *sb,
116 struct ext4_super_block *es)
117{
118 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
119 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
120 return 1;
121
122 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
123}
124
a9c47317
DW		 125static __le32 ext4_superblock_csum(struct super_block *sb,
126 struct ext4_super_block *es)
127{
128 struct ext4_sb_info *sbi = EXT4_SB(sb);
129 int offset = offsetof(struct ext4_super_block, s_checksum);
130 __u32 csum;
131
132 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
133
134 return cpu_to_le32(csum);
135}
136
137int ext4_superblock_csum_verify(struct super_block *sb,
138 struct ext4_super_block *es)
139{
140 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
141 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
142 return 1;
143
144 return es->s_checksum == ext4_superblock_csum(sb, es);
145}
146
147void ext4_superblock_csum_set(struct super_block *sb,
148 struct ext4_super_block *es)
149{
150 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
151 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
152 return;
153
154 es->s_checksum = ext4_superblock_csum(sb, es);
155}
156
9933fc0a
TT		 157void *ext4_kvmalloc(size_t size, gfp_t flags)
158{
159 void *ret;
160
161 ret = kmalloc(size, flags);
162 if (!ret)
163 ret = __vmalloc(size, flags, PAGE_KERNEL);
164 return ret;
165}
166
167void *ext4_kvzalloc(size_t size, gfp_t flags)
168{
169 void *ret;
170
db9481c0 171 ret = kzalloc(size, flags);
9933fc0a
TT		 172 if (!ret)
173 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
174 return ret;
175}
176
177void ext4_kvfree(void *ptr)
178{
179 if (is_vmalloc_addr(ptr))
180 vfree(ptr);
181 else
182 kfree(ptr);
183
184}
185
8fadc143
AR		 186ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
187 struct ext4_group_desc *bg)
bd81d8ee 188{
3a14589c 189 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 191 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 192}
193
8fadc143
AR		 194ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
195 struct ext4_group_desc *bg)
bd81d8ee 196{
5272f837 197 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 200}
201
8fadc143
AR		 202ext4_fsblk_t ext4_inode_table(struct super_block *sb,
203 struct ext4_group_desc *bg)
bd81d8ee 204{
5272f837 205 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 207 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 208}
209
021b65bb
TT		 210__u32 ext4_free_group_clusters(struct super_block *sb,
211 struct ext4_group_desc *bg)
560671a0
AK		 212{
213 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 215 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 216}
217
218__u32 ext4_free_inodes_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
220{
221 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 223 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 224}
225
226__u32 ext4_used_dirs_count(struct super_block *sb,
227 struct ext4_group_desc *bg)
228{
229 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 231 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 232}
233
234__u32 ext4_itable_unused_count(struct super_block *sb,
235 struct ext4_group_desc *bg)
236{
237 return le16_to_cpu(bg->bg_itable_unused_lo) |
238 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 239 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 240}
241
8fadc143
AR		 242void ext4_block_bitmap_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 244{
3a14589c 245 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 248}
249
8fadc143
AR		 250void ext4_inode_bitmap_set(struct super_block *sb,
251 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 252{
5272f837 253 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 256}
257
8fadc143
AR		 258void ext4_inode_table_set(struct super_block *sb,
259 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 260{
5272f837 261 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 264}
265
021b65bb
TT		 266void ext4_free_group_clusters_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 268{
269 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
272}
273
274void ext4_free_inodes_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
276{
277 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
280}
281
282void ext4_used_dirs_set(struct super_block *sb,
283 struct ext4_group_desc *bg, __u32 count)
284{
285 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
288}
289
290void ext4_itable_unused_set(struct super_block *sb,
291 struct ext4_group_desc *bg, __u32 count)
292{
293 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
294 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
295 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
296}
297
d3d1faf6
CW		 298
299/* Just increment the non-pointer handle value */
300static handle_t *ext4_get_nojournal(void)
301{
302 handle_t *handle = current->journal_info;
303 unsigned long ref_cnt = (unsigned long)handle;
304
305 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
306
307 ref_cnt++;
308 handle = (handle_t *)ref_cnt;
309
310 current->journal_info = handle;
311 return handle;
312}
313
314
315/* Decrement the non-pointer handle value */
316static void ext4_put_nojournal(handle_t *handle)
317{
318 unsigned long ref_cnt = (unsigned long)handle;
319
320 BUG_ON(ref_cnt == 0);
321
322 ref_cnt--;
323 handle = (handle_t *)ref_cnt;
324
325 current->journal_info = handle;
326}
327
ac27a0ec 328/*
dab291af 329 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 330 *
331 * The only special thing we need to do here is to make sure that all
332 * journal_end calls result in the superblock being marked dirty, so
333 * that sync() will call the filesystem's write_super callback if
334 * appropriate.
be4f27d3
YY		 335 *
336 * To avoid j_barrier hold in userspace when a user calls freeze(),
337 * ext4 prevents a new handle from being started by s_frozen, which
338 * is in an upper layer.
ac27a0ec 339 */
617ba13b 340handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 341{
342 journal_t *journal;
be4f27d3 343 handle_t *handle;
ac27a0ec 344
12706394 345 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 346 if (sb->s_flags & MS_RDONLY)
347 return ERR_PTR(-EROFS);
348
617ba13b 349 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 350 handle = ext4_journal_current_handle();
351
352 /*
353 * If a handle has been started, it should be allowed to
354 * finish, otherwise deadlock could happen between freeze
355 * and others(e.g. truncate) due to the restart of the
356 * journal handle if the filesystem is forzen and active
357 * handles are not stopped.
358 */
359 if (!handle)
360 vfs_check_frozen(sb, SB_FREEZE_TRANS);
361
362 if (!journal)
363 return ext4_get_nojournal();
364 /*
365 * Special case here: if the journal has aborted behind our
366 * backs (eg. EIO in the commit thread), then we still need to
367 * take the FS itself readonly cleanly.
368 */
369 if (is_journal_aborted(journal)) {
370 ext4_abort(sb, "Detected aborted journal");
371 return ERR_PTR(-EROFS);
ac27a0ec 372 }
be4f27d3 373 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 374}
375
376/*
377 * The only special thing we need to do here is to make sure that all
dab291af 378 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 379 * that sync() will call the filesystem's write_super callback if
380 * appropriate.
381 */
c398eda0 382int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 383{
384 struct super_block *sb;
385 int err;
386 int rc;
387
0390131b 388 if (!ext4_handle_valid(handle)) {
d3d1faf6 389 ext4_put_nojournal(handle);
0390131b
FM		 390 return 0;
391 }
ac27a0ec
DK		 392 sb = handle->h_transaction->t_journal->j_private;
393 err = handle->h_err;
dab291af 394 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 395
396 if (!err)
397 err = rc;
398 if (err)
c398eda0 399 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 400 return err;
401}
402
90c7201b
TT		 403void ext4_journal_abort_handle(const char *caller, unsigned int line,
404 const char *err_fn, struct buffer_head *bh,
405 handle_t *handle, int err)
ac27a0ec
DK		 406{
407 char nbuf[16];
617ba13b 408 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 409
0390131b
FM		 410 BUG_ON(!ext4_handle_valid(handle));
411
ac27a0ec
DK		 412 if (bh)
413 BUFFER_TRACE(bh, "abort");
414
415 if (!handle->h_err)
416 handle->h_err = err;
417
418 if (is_handle_aborted(handle))
419 return;
420
92b97816 421 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 422 caller, line, errstr, err_fn);
ac27a0ec 423
dab291af 424 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 425}
426
1c13d5c0
TT		 427static void __save_error_info(struct super_block *sb, const char *func,
428 unsigned int line)
429{
430 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
431
432 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
433 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
434 es->s_last_error_time = cpu_to_le32(get_seconds());
435 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
436 es->s_last_error_line = cpu_to_le32(line);
437 if (!es->s_first_error_time) {
438 es->s_first_error_time = es->s_last_error_time;
439 strncpy(es->s_first_error_func, func,
440 sizeof(es->s_first_error_func));
441 es->s_first_error_line = cpu_to_le32(line);
442 es->s_first_error_ino = es->s_last_error_ino;
443 es->s_first_error_block = es->s_last_error_block;
444 }
66e61a9e
TT		 445 /*
446 * Start the daily error reporting function if it hasn't been
447 * started already
448 */
449 if (!es->s_error_count)
450 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 451 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
452}
453
454static void save_error_info(struct super_block *sb, const char *func,
455 unsigned int line)
456{
457 __save_error_info(sb, func, line);
458 ext4_commit_super(sb, 1);
459}
460
7c2e7087
TT		 461/*
462 * The del_gendisk() function uninitializes the disk-specific data
463 * structures, including the bdi structure, without telling anyone
464 * else. Once this happens, any attempt to call mark_buffer_dirty()
465 * (for example, by ext4_commit_super), will cause a kernel OOPS.
466 * This is a kludge to prevent these oops until we can put in a proper
467 * hook in del_gendisk() to inform the VFS and file system layers.
468 */
469static int block_device_ejected(struct super_block *sb)
470{
471 struct inode *bd_inode = sb->s_bdev->bd_inode;
472 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
473
474 return bdi->dev == NULL;
475}
476
18aadd47
BJ		 477static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
478{
479 struct super_block *sb = journal->j_private;
480 struct ext4_sb_info *sbi = EXT4_SB(sb);
481 int error = is_journal_aborted(journal);
482 struct ext4_journal_cb_entry *jce, *tmp;
483
484 spin_lock(&sbi->s_md_lock);
485 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
486 list_del_init(&jce->jce_list);
487 spin_unlock(&sbi->s_md_lock);
488 jce->jce_func(sb, jce, error);
489 spin_lock(&sbi->s_md_lock);
490 }
491 spin_unlock(&sbi->s_md_lock);
492}
1c13d5c0 493
ac27a0ec
DK		 494/* Deal with the reporting of failure conditions on a filesystem such as
495 * inconsistencies detected or read IO failures.
496 *
497 * On ext2, we can store the error state of the filesystem in the
617ba13b 498 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 499 * write ordering constraints on the superblock which prevent us from
500 * writing it out straight away; and given that the journal is about to
501 * be aborted, we can't rely on the current, or future, transactions to
502 * write out the superblock safely.
503 *
dab291af 504 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 505 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 506 * that error until we've noted it down and cleared it.
507 */
508
617ba13b 509static void ext4_handle_error(struct super_block *sb)
ac27a0ec 510{
ac27a0ec
DK		 511 if (sb->s_flags & MS_RDONLY)
512 return;
513
2b2d6d01 514 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 515 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 516
4ab2f15b 517 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 518 if (journal)
dab291af 519 jbd2_journal_abort(journal, -EIO);
ac27a0ec 520 }
2b2d6d01 521 if (test_opt(sb, ERRORS_RO)) {
b31e1552 522 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 523 sb->s_flags |= MS_RDONLY;
524 }
ac27a0ec 525 if (test_opt(sb, ERRORS_PANIC))
617ba13b 526 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 527 sb->s_id);
528}
529
12062ddd 530void __ext4_error(struct super_block *sb, const char *function,
c398eda0 531 unsigned int line, const char *fmt, ...)
ac27a0ec 532{
0ff2ea7d 533 struct va_format vaf;
ac27a0ec
DK		 534 va_list args;
535
536 va_start(args, fmt);
0ff2ea7d
JP		 537 vaf.fmt = fmt;
538 vaf.va = &args;
539 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
540 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 541 va_end(args);
f3fc0210 542 save_error_info(sb, function, line);
ac27a0ec 543
617ba13b 544 ext4_handle_error(sb);
ac27a0ec
DK		 545}
546
c398eda0
TT		 547void ext4_error_inode(struct inode *inode, const char *function,
548 unsigned int line, ext4_fsblk_t block,
273df556
FM		 549 const char *fmt, ...)
550{
551 va_list args;
f7c21177 552 struct va_format vaf;
1c13d5c0 553 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 554
1c13d5c0
TT		 555 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
556 es->s_last_error_block = cpu_to_le64(block);
557 save_error_info(inode->i_sb, function, line);
273df556 558 va_start(args, fmt);
f7c21177
TT		 559 vaf.fmt = fmt;
560 vaf.va = &args;
c398eda0 561 if (block)
d9ee81da
JP		 562 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
563 "inode #%lu: block %llu: comm %s: %pV\n",
564 inode->i_sb->s_id, function, line, inode->i_ino,
565 block, current->comm, &vaf);
566 else
567 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
568 "inode #%lu: comm %s: %pV\n",
569 inode->i_sb->s_id, function, line, inode->i_ino,
570 current->comm, &vaf);
273df556
FM		 571 va_end(args);
572
573 ext4_handle_error(inode->i_sb);
574}
575
c398eda0 576void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 577 unsigned int line, ext4_fsblk_t block,
578 const char *fmt, ...)
273df556
FM		 579{
580 va_list args;
f7c21177 581 struct va_format vaf;
1c13d5c0 582 struct ext4_super_block *es;
273df556
FM		 583 struct inode *inode = file->f_dentry->d_inode;
584 char pathname[80], *path;
585
1c13d5c0
TT		 586 es = EXT4_SB(inode->i_sb)->s_es;
587 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
588 save_error_info(inode->i_sb, function, line);
273df556 589 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 590 if (IS_ERR(path))
273df556 591 path = "(unknown)";
f7c21177
TT		 592 va_start(args, fmt);
593 vaf.fmt = fmt;
594 vaf.va = &args;
d9ee81da
JP		 595 if (block)
596 printk(KERN_CRIT
597 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
598 "block %llu: comm %s: path %s: %pV\n",
599 inode->i_sb->s_id, function, line, inode->i_ino,
600 block, current->comm, path, &vaf);
601 else
602 printk(KERN_CRIT
603 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
604 "comm %s: path %s: %pV\n",
605 inode->i_sb->s_id, function, line, inode->i_ino,
606 current->comm, path, &vaf);
273df556
FM		 607 va_end(args);
608
609 ext4_handle_error(inode->i_sb);
610}
611
2b2d6d01 612static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 613 char nbuf[16])
614{
615 char *errstr = NULL;
616
617 switch (errno) {
618 case -EIO:
619 errstr = "IO failure";
620 break;
621 case -ENOMEM:
622 errstr = "Out of memory";
623 break;
624 case -EROFS:
78f1ddbb
TT		 625 if (!sb || (EXT4_SB(sb)->s_journal &&
626 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 627 errstr = "Journal has aborted";
628 else
629 errstr = "Readonly filesystem";
630 break;
631 default:
632 /* If the caller passed in an extra buffer for unknown
633 * errors, textualise them now. Else we just return
634 * NULL. */
635 if (nbuf) {
636 /* Check for truncated error codes... */
637 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
638 errstr = nbuf;
639 }
640 break;
641 }
642
643 return errstr;
644}
645
617ba13b 646/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 647 * automatically and invokes the appropriate error response. */
648
c398eda0
TT		 649void __ext4_std_error(struct super_block *sb, const char *function,
650 unsigned int line, int errno)
ac27a0ec
DK		 651{
652 char nbuf[16];
653 const char *errstr;
654
655 /* Special case: if the error is EROFS, and we're not already
656 * inside a transaction, then there's really no point in logging
657 * an error. */
658 if (errno == -EROFS && journal_current_handle() == NULL &&
659 (sb->s_flags & MS_RDONLY))
660 return;
661
617ba13b 662 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 663 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
664 sb->s_id, function, line, errstr);
1c13d5c0 665 save_error_info(sb, function, line);
ac27a0ec 666
617ba13b 667 ext4_handle_error(sb);
ac27a0ec
DK		 668}
669
670/*
617ba13b 671 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 672 * abort function may be used to deal with unrecoverable failures such
673 * as journal IO errors or ENOMEM at a critical moment in log management.
674 *
675 * We unconditionally force the filesystem into an ABORT|READONLY state,
676 * unless the error response on the fs has been set to panic in which
677 * case we take the easy way out and panic immediately.
678 */
679
c67d859e 680void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 681 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 682{
683 va_list args;
684
1c13d5c0 685 save_error_info(sb, function, line);
ac27a0ec 686 va_start(args, fmt);
c398eda0
TT		 687 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
688 function, line);
ac27a0ec
DK		 689 vprintk(fmt, args);
690 printk("\n");
691 va_end(args);
692
1c13d5c0
TT		 693 if ((sb->s_flags & MS_RDONLY) == 0) {
694 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
695 sb->s_flags |= MS_RDONLY;
696 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
697 if (EXT4_SB(sb)->s_journal)
698 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
699 save_error_info(sb, function, line);
700 }
ac27a0ec 701 if (test_opt(sb, ERRORS_PANIC))
617ba13b 702 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 703}
704
0ff2ea7d 705void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 706{
0ff2ea7d 707 struct va_format vaf;
b31e1552
ES		 708 va_list args;
709
710 va_start(args, fmt);
0ff2ea7d
JP		 711 vaf.fmt = fmt;
712 vaf.va = &args;
713 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 714 va_end(args);
715}
716
12062ddd 717void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 718 unsigned int line, const char *fmt, ...)
ac27a0ec 719{
0ff2ea7d 720 struct va_format vaf;
ac27a0ec
DK		 721 va_list args;
722
723 va_start(args, fmt);
0ff2ea7d
JP		 724 vaf.fmt = fmt;
725 vaf.va = &args;
726 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
727 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 728 va_end(args);
729}
730
e29136f8
TT		 731void __ext4_grp_locked_error(const char *function, unsigned int line,
732 struct super_block *sb, ext4_group_t grp,
733 unsigned long ino, ext4_fsblk_t block,
734 const char *fmt, ...)
5d1b1b3f
AK		 735__releases(bitlock)
736__acquires(bitlock)
737{
0ff2ea7d 738 struct va_format vaf;
5d1b1b3f
AK		 739 va_list args;
740 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
741
1c13d5c0
TT		 742 es->s_last_error_ino = cpu_to_le32(ino);
743 es->s_last_error_block = cpu_to_le64(block);
744 __save_error_info(sb, function, line);
0ff2ea7d 745
5d1b1b3f 746 va_start(args, fmt);
0ff2ea7d
JP		 747
748 vaf.fmt = fmt;
749 vaf.va = &args;
21149d61 750 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 751 sb->s_id, function, line, grp);
752 if (ino)
0ff2ea7d 753 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 754 if (block)
0ff2ea7d
JP		 755 printk(KERN_CONT "block %llu:", (unsigned long long) block);
756 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 757 va_end(args);
758
759 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 760 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 761 return;
762 }
1c13d5c0 763
5d1b1b3f
AK		 764 ext4_unlock_group(sb, grp);
765 ext4_handle_error(sb);
766 /*
767 * We only get here in the ERRORS_RO case; relocking the group
768 * may be dangerous, but nothing bad will happen since the
769 * filesystem will have already been marked read/only and the
770 * journal has been aborted. We return 1 as a hint to callers
771 * who might what to use the return value from
25985edc 772 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 773 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
774 * aggressively from the ext4 function in question, with a
775 * more appropriate error code.
776 */
777 ext4_lock_group(sb, grp);
778 return;
779}
780
617ba13b 781void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 782{
617ba13b 783 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 784
617ba13b 785 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 786 return;
787
12062ddd 788 ext4_warning(sb,
ac27a0ec
DK		 789 "updating to rev %d because of new feature flag, "
790 "running e2fsck is recommended",
617ba13b 791 EXT4_DYNAMIC_REV);
ac27a0ec 792
617ba13b
MC		 793 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
794 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
795 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 796 /* leave es->s_feature_*compat flags alone */
797 /* es->s_uuid will be set by e2fsck if empty */
798
799 /*
800 * The rest of the superblock fields should be zero, and if not it
801 * means they are likely already in use, so leave them alone. We
802 * can leave it up to e2fsck to clean up any inconsistencies there.
803 */
804}
805
806/*
807 * Open the external journal device
808 */
b31e1552 809static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 810{
811 struct block_device *bdev;
812 char b[BDEVNAME_SIZE];
813
d4d77629 814 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 815 if (IS_ERR(bdev))
816 goto fail;
817 return bdev;
818
819fail:
b31e1552 820 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 821 __bdevname(dev, b), PTR_ERR(bdev));
822 return NULL;
823}
824
825/*
826 * Release the journal device
827 */
617ba13b 828static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 829{
e525fd89 830 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 831}
832
617ba13b 833static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 834{
835 struct block_device *bdev;
836 int ret = -ENODEV;
837
838 bdev = sbi->journal_bdev;
839 if (bdev) {
617ba13b 840 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 841 sbi->journal_bdev = NULL;
842 }
843 return ret;
844}
845
846static inline struct inode *orphan_list_entry(struct list_head *l)
847{
617ba13b 848 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 849}
850
617ba13b 851static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 852{
853 struct list_head *l;
854
b31e1552
ES		 855 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
856 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 857
858 printk(KERN_ERR "sb_info orphan list:\n");
859 list_for_each(l, &sbi->s_orphan) {
860 struct inode *inode = orphan_list_entry(l);
861 printk(KERN_ERR " "
862 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
863 inode->i_sb->s_id, inode->i_ino, inode,
864 inode->i_mode, inode->i_nlink,
865 NEXT_ORPHAN(inode));
866 }
867}
868
2b2d6d01 869static void ext4_put_super(struct super_block *sb)
ac27a0ec 870{
617ba13b
MC		 871 struct ext4_sb_info *sbi = EXT4_SB(sb);
872 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 873 int i, err;
ac27a0ec 874
857ac889 875 ext4_unregister_li_request(sb);
e0ccfd95
CH		 876 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
877
4c0425ff
MC		 878 flush_workqueue(sbi->dio_unwritten_wq);
879 destroy_workqueue(sbi->dio_unwritten_wq);
880
a9e220f8 881 lock_super(sb);
0390131b
FM		 882 if (sbi->s_journal) {
883 err = jbd2_journal_destroy(sbi->s_journal);
884 sbi->s_journal = NULL;
885 if (err < 0)
c67d859e 886 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 887 }
d4edac31 888
a1c6c569 889 del_timer(&sbi->s_err_report);
d4edac31
JB		 890 ext4_release_system_zone(sb);
891 ext4_mb_release(sb);
892 ext4_ext_release(sb);
893 ext4_xattr_put_super(sb);
894
ac27a0ec 895 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 896 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 897 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 898 }
a8e25a83
AB		 899 if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
900 ext4_commit_super(sb, 1);
901
240799cd 902 if (sbi->s_proc) {
66acdcf4 903 remove_proc_entry("options", sbi->s_proc);
9f6200bb 904 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 905 }
3197ebdb 906 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 907
908 for (i = 0; i < sbi->s_gdb_count; i++)
909 brelse(sbi->s_group_desc[i]);
f18a5f21 910 ext4_kvfree(sbi->s_group_desc);
9933fc0a 911 ext4_kvfree(sbi->s_flex_groups);
57042651 912 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 913 percpu_counter_destroy(&sbi->s_freeinodes_counter);
914 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 915 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 916 brelse(sbi->s_sbh);
917#ifdef CONFIG_QUOTA
918 for (i = 0; i < MAXQUOTAS; i++)
919 kfree(sbi->s_qf_names[i]);
920#endif
921
922 /* Debugging code just in case the in-memory inode orphan list
923 * isn't empty. The on-disk one can be non-empty if we've
924 * detected an error and taken the fs readonly, but the
925 * in-memory list had better be clean by this point. */
926 if (!list_empty(&sbi->s_orphan))
927 dump_orphan_list(sb, sbi);
928 J_ASSERT(list_empty(&sbi->s_orphan));
929
f98393a6 930 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 931 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
932 /*
933 * Invalidate the journal device's buffers. We don't want them
934 * floating about in memory - the physical journal device may
935 * hotswapped, and it breaks the `ro-after' testing code.
936 */
937 sync_blockdev(sbi->journal_bdev);
f98393a6 938 invalidate_bdev(sbi->journal_bdev);
617ba13b 939 ext4_blkdev_remove(sbi);
ac27a0ec 940 }
c5e06d10
JL		 941 if (sbi->s_mmp_tsk)
942 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 943 sb->s_fs_info = NULL;
3197ebdb
TT		 944 /*
945 * Now that we are completely done shutting down the
946 * superblock, we need to actually destroy the kobject.
947 */
3197ebdb
TT		 948 unlock_super(sb);
949 kobject_put(&sbi->s_kobj);
950 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 951 if (sbi->s_chksum_driver)
952 crypto_free_shash(sbi->s_chksum_driver);
705895b6 953 kfree(sbi->s_blockgroup_lock);
ac27a0ec 954 kfree(sbi);
ac27a0ec
DK		 955}
956
e18b890b 957static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 958
959/*
960 * Called inside transaction, so use GFP_NOFS
961 */
617ba13b 962static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 963{
617ba13b 964 struct ext4_inode_info *ei;
ac27a0ec 965
e6b4f8da 966 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 967 if (!ei)
968 return NULL;
0b8e58a1 969
ac27a0ec 970 ei->vfs_inode.i_version = 1;
91246c00 971 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 972 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 973 INIT_LIST_HEAD(&ei->i_prealloc_list);
974 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 975 ei->i_reserved_data_blocks = 0;
976 ei->i_reserved_meta_blocks = 0;
977 ei->i_allocated_meta_blocks = 0;
9d0be502 978 ei->i_da_metadata_calc_len = 0;
d2a17637 979 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 980#ifdef CONFIG_QUOTA
981 ei->i_reserved_quota = 0;
982#endif
8aefcd55 983 ei->jinode = NULL;
c7064ef1 984 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 985 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 986 ei->cur_aio_dio = NULL;
b436b9be
JK		 987 ei->i_sync_tid = 0;
988 ei->i_datasync_tid = 0;
f7ad6d2e 989 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 990 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 991
ac27a0ec
DK		 992 return &ei->vfs_inode;
993}
994
7ff9c073
TT		 995static int ext4_drop_inode(struct inode *inode)
996{
997 int drop = generic_drop_inode(inode);
998
999 trace_ext4_drop_inode(inode, drop);
1000 return drop;
1001}
1002
fa0d7e3d
NP		 1003static void ext4_i_callback(struct rcu_head *head)
1004{
1005 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 1006 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1007}
1008
617ba13b 1009static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1010{
9f7dd93d 1011 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1012 ext4_msg(inode->i_sb, KERN_ERR,
1013 "Inode %lu (%p): orphan list check failed!",
1014 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1015 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1016 EXT4_I(inode), sizeof(struct ext4_inode_info),
1017 true);
1018 dump_stack();
1019 }
fa0d7e3d 1020 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1021}
1022
51cc5068 1023static void init_once(void *foo)
ac27a0ec 1024{
617ba13b 1025 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1026
a35afb83 1027 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 1028#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 1029 init_rwsem(&ei->xattr_sem);
ac27a0ec 1030#endif
0e855ac8 1031 init_rwsem(&ei->i_data_sem);
a35afb83 1032 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1033}
1034
1035static int init_inodecache(void)
1036{
617ba13b
MC		 1037 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1038 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 1039 0, (SLAB_RECLAIM_ACCOUNT|
1040 SLAB_MEM_SPREAD),
20c2df83 1041 init_once);
617ba13b 1042 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1043 return -ENOMEM;
1044 return 0;
1045}
1046
1047static void destroy_inodecache(void)
1048{
617ba13b 1049 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1050}
1051
0930fcc1 1052void ext4_clear_inode(struct inode *inode)
ac27a0ec 1053{
0930fcc1 1054 invalidate_inode_buffers(inode);
dbd5768f 1055 clear_inode(inode);
9f754758 1056 dquot_drop(inode);
c2ea3fde 1057 ext4_discard_preallocations(inode);
8aefcd55
TT		 1058 if (EXT4_I(inode)->jinode) {
1059 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1060 EXT4_I(inode)->jinode);
1061 jbd2_free_inode(EXT4_I(inode)->jinode);
1062 EXT4_I(inode)->jinode = NULL;
1063 }
ac27a0ec
DK		 1064}
1065
1b961ac0 1066static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1067 u64 ino, u32 generation)
ac27a0ec 1068{
ac27a0ec 1069 struct inode *inode;
ac27a0ec 1070
617ba13b 1071 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1072 return ERR_PTR(-ESTALE);
617ba13b 1073 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1074 return ERR_PTR(-ESTALE);
1075
1076 /* iget isn't really right if the inode is currently unallocated!!
1077 *
617ba13b 1078 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1079 * deleted, so we should be safe.
1080 *
1081 * Currently we don't know the generation for parent directory, so
1082 * a generation of 0 means "accept any"
1083 */
1d1fe1ee
DH		 1084 inode = ext4_iget(sb, ino);
1085 if (IS_ERR(inode))
1086 return ERR_CAST(inode);
1087 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1088 iput(inode);
1089 return ERR_PTR(-ESTALE);
1090 }
1b961ac0
CH		 1091
1092 return inode;
1093}
1094
1095static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1096 int fh_len, int fh_type)
1b961ac0
CH		 1097{
1098 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1099 ext4_nfs_get_inode);
1100}
1101
1102static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1103 int fh_len, int fh_type)
1b961ac0
CH		 1104{
1105 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1106 ext4_nfs_get_inode);
ac27a0ec
DK		 1107}
1108
c39a7f84
TO		 1109/*
1110 * Try to release metadata pages (indirect blocks, directories) which are
1111 * mapped via the block device. Since these pages could have journal heads
1112 * which would prevent try_to_free_buffers() from freeing them, we must use
1113 * jbd2 layer's try_to_free_buffers() function to release them.
1114 */
0b8e58a1
AD		 1115static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1116 gfp_t wait)
c39a7f84
TO		 1117{
1118 journal_t *journal = EXT4_SB(sb)->s_journal;
1119
1120 WARN_ON(PageChecked(page));
1121 if (!page_has_buffers(page))
1122 return 0;
1123 if (journal)
1124 return jbd2_journal_try_to_free_buffers(journal, page,
1125 wait & ~__GFP_WAIT);
1126 return try_to_free_buffers(page);
1127}
1128
ac27a0ec 1129#ifdef CONFIG_QUOTA
af5bc92d 1130#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1131#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1132
617ba13b
MC		 1133static int ext4_write_dquot(struct dquot *dquot);
1134static int ext4_acquire_dquot(struct dquot *dquot);
1135static int ext4_release_dquot(struct dquot *dquot);
1136static int ext4_mark_dquot_dirty(struct dquot *dquot);
1137static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1138static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1139 struct path *path);
ca0e05e4 1140static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1141static int ext4_quota_on_mount(struct super_block *sb, int type);
1142static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1143 size_t len, loff_t off);
617ba13b 1144static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1145 const char *data, size_t len, loff_t off);
1146
61e225dc 1147static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1148 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1149 .write_dquot = ext4_write_dquot,
1150 .acquire_dquot = ext4_acquire_dquot,
1151 .release_dquot = ext4_release_dquot,
1152 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1153 .write_info = ext4_write_info,
1154 .alloc_dquot = dquot_alloc,
1155 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1156};
1157
0d54b217 1158static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1159 .quota_on = ext4_quota_on,
ca0e05e4 1160 .quota_off = ext4_quota_off,
287a8095
CH		 1161 .quota_sync = dquot_quota_sync,
1162 .get_info = dquot_get_dqinfo,
1163 .set_info = dquot_set_dqinfo,
1164 .get_dqblk = dquot_get_dqblk,
1165 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1166};
1167#endif
1168
ee9b6d61 1169static const struct super_operations ext4_sops = {
617ba13b
MC		 1170 .alloc_inode = ext4_alloc_inode,
1171 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1172 .write_inode = ext4_write_inode,
1173 .dirty_inode = ext4_dirty_inode,
7ff9c073 1174 .drop_inode = ext4_drop_inode,
0930fcc1 1175 .evict_inode = ext4_evict_inode,
617ba13b 1176 .put_super = ext4_put_super,
617ba13b 1177 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1178 .freeze_fs = ext4_freeze,
1179 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1180 .statfs = ext4_statfs,
1181 .remount_fs = ext4_remount,
617ba13b 1182 .show_options = ext4_show_options,
ac27a0ec 1183#ifdef CONFIG_QUOTA
617ba13b
MC		 1184 .quota_read = ext4_quota_read,
1185 .quota_write = ext4_quota_write,
ac27a0ec 1186#endif
c39a7f84 1187 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1188};
1189
9ca92389
TT		 1190static const struct super_operations ext4_nojournal_sops = {
1191 .alloc_inode = ext4_alloc_inode,
1192 .destroy_inode = ext4_destroy_inode,
1193 .write_inode = ext4_write_inode,
1194 .dirty_inode = ext4_dirty_inode,
7ff9c073 1195 .drop_inode = ext4_drop_inode,
0930fcc1 1196 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1197 .write_super = ext4_write_super,
1198 .put_super = ext4_put_super,
1199 .statfs = ext4_statfs,
1200 .remount_fs = ext4_remount,
9ca92389
TT		 1201 .show_options = ext4_show_options,
1202#ifdef CONFIG_QUOTA
1203 .quota_read = ext4_quota_read,
1204 .quota_write = ext4_quota_write,
1205#endif
1206 .bdev_try_to_free_page = bdev_try_to_free_page,
1207};
1208
39655164 1209static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1210 .fh_to_dentry = ext4_fh_to_dentry,
1211 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1212 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1213};
1214
1215enum {
1216 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1217 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1218 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1219 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1220 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1221 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1222 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1223 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1224 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1225 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1226 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1227 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1228 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1229 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1230 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1231 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1232 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1233 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1234};
1235
a447c093 1236static const match_table_t tokens = {
ac27a0ec
DK		 1237 {Opt_bsd_df, "bsddf"},
1238 {Opt_minix_df, "minixdf"},
1239 {Opt_grpid, "grpid"},
1240 {Opt_grpid, "bsdgroups"},
1241 {Opt_nogrpid, "nogrpid"},
1242 {Opt_nogrpid, "sysvgroups"},
1243 {Opt_resgid, "resgid=%u"},
1244 {Opt_resuid, "resuid=%u"},
1245 {Opt_sb, "sb=%u"},
1246 {Opt_err_cont, "errors=continue"},
1247 {Opt_err_panic, "errors=panic"},
1248 {Opt_err_ro, "errors=remount-ro"},
1249 {Opt_nouid32, "nouid32"},
ac27a0ec 1250 {Opt_debug, "debug"},
72578c33
TT		 1251 {Opt_removed, "oldalloc"},
1252 {Opt_removed, "orlov"},
ac27a0ec
DK		 1253 {Opt_user_xattr, "user_xattr"},
1254 {Opt_nouser_xattr, "nouser_xattr"},
1255 {Opt_acl, "acl"},
1256 {Opt_noacl, "noacl"},
e3bb52ae 1257 {Opt_noload, "norecovery"},
5a916be1 1258 {Opt_noload, "noload"},
72578c33
TT		 1259 {Opt_removed, "nobh"},
1260 {Opt_removed, "bh"},
ac27a0ec 1261 {Opt_commit, "commit=%u"},
30773840
TT		 1262 {Opt_min_batch_time, "min_batch_time=%u"},
1263 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1264 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1265 {Opt_journal_checksum, "journal_checksum"},
1266 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1267 {Opt_abort, "abort"},
1268 {Opt_data_journal, "data=journal"},
1269 {Opt_data_ordered, "data=ordered"},
1270 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1271 {Opt_data_err_abort, "data_err=abort"},
1272 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1273 {Opt_offusrjquota, "usrjquota="},
1274 {Opt_usrjquota, "usrjquota=%s"},
1275 {Opt_offgrpjquota, "grpjquota="},
1276 {Opt_grpjquota, "grpjquota=%s"},
1277 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1278 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1279 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1280 {Opt_grpquota, "grpquota"},
1281 {Opt_noquota, "noquota"},
1282 {Opt_quota, "quota"},
1283 {Opt_usrquota, "usrquota"},
1284 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1285 {Opt_barrier, "barrier"},
1286 {Opt_nobarrier, "nobarrier"},
25ec56b5 1287 {Opt_i_version, "i_version"},
c9de560d 1288 {Opt_stripe, "stripe=%u"},
64769240 1289 {Opt_delalloc, "delalloc"},
dd919b98 1290 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1291 {Opt_mblk_io_submit, "mblk_io_submit"},
1292 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1293 {Opt_block_validity, "block_validity"},
1294 {Opt_noblock_validity, "noblock_validity"},
240799cd 1295 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1296 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1297 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1298 {Opt_auto_da_alloc, "auto_da_alloc"},
1299 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1300 {Opt_dioread_nolock, "dioread_nolock"},
1301 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1302 {Opt_discard, "discard"},
1303 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1304 {Opt_init_itable, "init_itable=%u"},
1305 {Opt_init_itable, "init_itable"},
1306 {Opt_noinit_itable, "noinit_itable"},
c7198b9c
TT		 1307 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1308 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1309 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1310 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1311 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1312 {Opt_err, NULL},
ac27a0ec
DK		 1313};
1314
617ba13b 1315static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1316{
617ba13b 1317 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1318 char *options = (char *) *data;
1319
1320 if (!options || strncmp(options, "sb=", 3) != 0)
1321 return 1; /* Default location */
0b8e58a1 1322
ac27a0ec 1323 options += 3;
0b8e58a1 1324 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1325 sb_block = simple_strtoul(options, &options, 0);
1326 if (*options && *options != ',') {
4776004f 1327 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1328 (char *) *data);
1329 return 1;
1330 }
1331 if (*options == ',')
1332 options++;
1333 *data = (void *) options;
0b8e58a1 1334
ac27a0ec
DK		 1335 return sb_block;
1336}
1337
b3881f74 1338#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1339static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1340 "Contact [email protected] if you think we should keep it.\n";
b3881f74 1341
56c50f11
DM		 1342#ifdef CONFIG_QUOTA
1343static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1344{
1345 struct ext4_sb_info *sbi = EXT4_SB(sb);
1346 char *qname;
1347
1348 if (sb_any_quota_loaded(sb) &&
1349 !sbi->s_qf_names[qtype]) {
1350 ext4_msg(sb, KERN_ERR,
1351 "Cannot change journaled "
1352 "quota options when quota turned on");
57f73c2c 1353 return -1;
56c50f11
DM		 1354 }
1355 qname = match_strdup(args);
1356 if (!qname) {
1357 ext4_msg(sb, KERN_ERR,
1358 "Not enough memory for storing quotafile name");
57f73c2c 1359 return -1;
56c50f11
DM		 1360 }
1361 if (sbi->s_qf_names[qtype] &&
1362 strcmp(sbi->s_qf_names[qtype], qname)) {
1363 ext4_msg(sb, KERN_ERR,
1364 "%s quota file already specified", QTYPE2NAME(qtype));
1365 kfree(qname);
57f73c2c 1366 return -1;
56c50f11
DM		 1367 }
1368 sbi->s_qf_names[qtype] = qname;
1369 if (strchr(sbi->s_qf_names[qtype], '/')) {
1370 ext4_msg(sb, KERN_ERR,
1371 "quotafile must be on filesystem root");
1372 kfree(sbi->s_qf_names[qtype]);
1373 sbi->s_qf_names[qtype] = NULL;
57f73c2c 1374 return -1;
56c50f11 1375 }
fd8c37ec 1376 set_opt(sb, QUOTA);
56c50f11
DM		 1377 return 1;
1378}
1379
1380static int clear_qf_name(struct super_block *sb, int qtype)
1381{
1382
1383 struct ext4_sb_info *sbi = EXT4_SB(sb);
1384
1385 if (sb_any_quota_loaded(sb) &&
1386 sbi->s_qf_names[qtype]) {
1387 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1388 " when quota turned on");
57f73c2c 1389 return -1;
56c50f11
DM		 1390 }
1391 /*
1392 * The space will be released later when all options are confirmed
1393 * to be correct
1394 */
1395 sbi->s_qf_names[qtype] = NULL;
1396 return 1;
1397}
1398#endif
1399
26092bf5
TT		 1400#define MOPT_SET 0x0001
1401#define MOPT_CLEAR 0x0002
1402#define MOPT_NOSUPPORT 0x0004
1403#define MOPT_EXPLICIT 0x0008
1404#define MOPT_CLEAR_ERR 0x0010
1405#define MOPT_GTE0 0x0020
ac27a0ec 1406#ifdef CONFIG_QUOTA
26092bf5
TT		 1407#define MOPT_Q 0
1408#define MOPT_QFMT 0x0040
1409#else
1410#define MOPT_Q MOPT_NOSUPPORT
1411#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1412#endif
26092bf5
TT		 1413#define MOPT_DATAJ 0x0080
1414
1415static const struct mount_opts {
1416 int token;
1417 int mount_opt;
1418 int flags;
1419} ext4_mount_opts[] = {
1420 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1421 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1422 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1423 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1424 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1425 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1426 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1427 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1428 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1429 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1430 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1431 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1432 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1433 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1434 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1435 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1436 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1437 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1438 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1439 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1440 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1441 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1442 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1443 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1444 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1445 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1446 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1447 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1448 {Opt_commit, 0, MOPT_GTE0},
1449 {Opt_max_batch_time, 0, MOPT_GTE0},
1450 {Opt_min_batch_time, 0, MOPT_GTE0},
1451 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1452 {Opt_init_itable, 0, MOPT_GTE0},
1453 {Opt_stripe, 0, MOPT_GTE0},
1454 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1455 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1456 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1457#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1458 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1459 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1460#else
26092bf5
TT		 1461 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1462 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1463#endif
03010a33 1464#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1465 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1466 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1467#else
26092bf5
TT		 1468 {Opt_acl, 0, MOPT_NOSUPPORT},
1469 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1470#endif
26092bf5
TT		 1471 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1472 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1473 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1474 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1475 MOPT_SET | MOPT_Q},
1476 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1477 MOPT_SET | MOPT_Q},
1478 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1479 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1480 {Opt_usrjquota, 0, MOPT_Q},
1481 {Opt_grpjquota, 0, MOPT_Q},
1482 {Opt_offusrjquota, 0, MOPT_Q},
1483 {Opt_offgrpjquota, 0, MOPT_Q},
1484 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1485 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1486 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
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;
1602 } else if (token == Opt_stripe) {
1603 sbi->s_stripe = arg;
1604 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1605 if (is_remount) {
eb513689
TT		 1606 if (!sbi->s_journal)
1607 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1608 else if (test_opt(sb, DATA_FLAGS) !=
1609 m->mount_opt) {
b31e1552 1610 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1611 "Cannot change data mode on remount");
1612 return -1;
ac27a0ec
DK		 1613 }
1614 } else {
fd8c37ec 1615 clear_opt(sb, DATA_FLAGS);
26092bf5 1616 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1617 }
ac27a0ec 1618#ifdef CONFIG_QUOTA
26092bf5 1619 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1620 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1621 sbi->s_jquota_fmt != m->mount_opt) {
1622 ext4_msg(sb, KERN_ERR, "Cannot "
1623 "change journaled quota options "
1624 "when quota turned on");
1625 return -1;
ac27a0ec 1626 }
26092bf5 1627 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1628#endif
26092bf5
TT		 1629 } else {
1630 if (!args->from)
1631 arg = 1;
1632 if (m->flags & MOPT_CLEAR)
1633 arg = !arg;
1634 else if (unlikely(!(m->flags & MOPT_SET))) {
1635 ext4_msg(sb, KERN_WARNING,
1636 "buggy handling of option %s", opt);
1637 WARN_ON(1);
1638 return -1;
3197ebdb 1639 }
26092bf5
TT		 1640 if (arg != 0)
1641 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1642 else
26092bf5 1643 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1644 }
26092bf5
TT		 1645 return 1;
1646 }
1647 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1648 "or missing value", opt);
1649 return -1;
1650}
1651
1652static int parse_options(char *options, struct super_block *sb,
1653 unsigned long *journal_devnum,
1654 unsigned int *journal_ioprio,
1655 int is_remount)
1656{
db7e5c66 1657#ifdef CONFIG_QUOTA
26092bf5 1658 struct ext4_sb_info *sbi = EXT4_SB(sb);
db7e5c66 1659#endif
26092bf5
TT		 1660 char *p;
1661 substring_t args[MAX_OPT_ARGS];
1662 int token;
1663
1664 if (!options)
1665 return 1;
1666
1667 while ((p = strsep(&options, ",")) != NULL) {
1668 if (!*p)
1669 continue;
1670 /*
1671 * Initialize args struct so we know whether arg was
1672 * found; some options take optional arguments.
1673 */
1674 args[0].to = args[0].from = 0;
1675 token = match_token(p, tokens, args);
1676 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1677 journal_ioprio, is_remount) < 0)
1678 return 0;
ac27a0ec
DK		 1679 }
1680#ifdef CONFIG_QUOTA
1681 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1682 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1683 clear_opt(sb, USRQUOTA);
ac27a0ec 1684
482a7425 1685 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1686 clear_opt(sb, GRPQUOTA);
ac27a0ec 1687
56c50f11 1688 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1689 ext4_msg(sb, KERN_ERR, "old and new quota "
1690 "format mixing");
ac27a0ec
DK		 1691 return 0;
1692 }
1693
1694 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1695 ext4_msg(sb, KERN_ERR, "journaled quota format "
1696 "not specified");
ac27a0ec
DK		 1697 return 0;
1698 }
1699 } else {
1700 if (sbi->s_jquota_fmt) {
b31e1552 1701 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1702 "specified with no journaling "
b31e1552 1703 "enabled");
ac27a0ec
DK		 1704 return 0;
1705 }
1706 }
1707#endif
1708 return 1;
1709}
1710
2adf6da8
TT		 1711static inline void ext4_show_quota_options(struct seq_file *seq,
1712 struct super_block *sb)
1713{
1714#if defined(CONFIG_QUOTA)
1715 struct ext4_sb_info *sbi = EXT4_SB(sb);
1716
1717 if (sbi->s_jquota_fmt) {
1718 char *fmtname = "";
1719
1720 switch (sbi->s_jquota_fmt) {
1721 case QFMT_VFS_OLD:
1722 fmtname = "vfsold";
1723 break;
1724 case QFMT_VFS_V0:
1725 fmtname = "vfsv0";
1726 break;
1727 case QFMT_VFS_V1:
1728 fmtname = "vfsv1";
1729 break;
1730 }
1731 seq_printf(seq, ",jqfmt=%s", fmtname);
1732 }
1733
1734 if (sbi->s_qf_names[USRQUOTA])
1735 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1736
1737 if (sbi->s_qf_names[GRPQUOTA])
1738 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1739
1740 if (test_opt(sb, USRQUOTA))
1741 seq_puts(seq, ",usrquota");
1742
1743 if (test_opt(sb, GRPQUOTA))
1744 seq_puts(seq, ",grpquota");
1745#endif
1746}
1747
5a916be1
TT		 1748static const char *token2str(int token)
1749{
1750 static const struct match_token *t;
1751
1752 for (t = tokens; t->token != Opt_err; t++)
1753 if (t->token == token && !strchr(t->pattern, '='))
1754 break;
1755 return t->pattern;
1756}
1757
2adf6da8
TT		 1758/*
1759 * Show an option if
1760 * - it's set to a non-default value OR
1761 * - if the per-sb default is different from the global default
1762 */
66acdcf4
TT		 1763static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1764 int nodefs)
2adf6da8 1765{
2adf6da8
TT		 1766 struct ext4_sb_info *sbi = EXT4_SB(sb);
1767 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1768 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1769 const struct mount_opts *m;
66acdcf4 1770 char sep = nodefs ? '\n' : ',';
2adf6da8 1771
66acdcf4
TT		 1772#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1773#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1774
1775 if (sbi->s_sb_block != 1)
5a916be1
TT		 1776 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1777
1778 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1779 int want_set = m->flags & MOPT_SET;
1780 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1781 (m->flags & MOPT_CLEAR_ERR))
1782 continue;
66acdcf4 1783 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1784 continue; /* skip if same as the default */
1785 if ((want_set &&
1786 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1787 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1788 continue; /* select Opt_noFoo vs Opt_Foo */
1789 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1790 }
5a916be1 1791
08cefc7a 1792 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1793 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1794 SEQ_OPTS_PRINT("resuid=%u",
1795 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1796 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1797 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1798 SEQ_OPTS_PRINT("resgid=%u",
1799 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1800 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1801 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1802 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1803 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1804 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1805 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1806 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1807 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1808 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1809 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1810 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1811 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1812 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1813 if (sb->s_flags & MS_I_VERSION)
5a916be1 1814 SEQ_OPTS_PUTS("i_version");
66acdcf4 1815 if (nodefs || sbi->s_stripe)
5a916be1 1816 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1817 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1818 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1819 SEQ_OPTS_PUTS("data=journal");
1820 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1821 SEQ_OPTS_PUTS("data=ordered");
1822 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1823 SEQ_OPTS_PUTS("data=writeback");
1824 }
66acdcf4
TT		 1825 if (nodefs ||
1826 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1827 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1828 sbi->s_inode_readahead_blks);
2adf6da8 1829
66acdcf4
TT		 1830 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1831 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1832 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2adf6da8
TT		 1833
1834 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1835 return 0;
1836}
1837
66acdcf4
TT		 1838static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1839{
1840 return _ext4_show_options(seq, root->d_sb, 0);
1841}
1842
1843static int options_seq_show(struct seq_file *seq, void *offset)
1844{
1845 struct super_block *sb = seq->private;
1846 int rc;
1847
1848 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1849 rc = _ext4_show_options(seq, sb, 1);
1850 seq_puts(seq, "\n");
1851 return rc;
1852}
1853
1854static int options_open_fs(struct inode *inode, struct file *file)
1855{
1856 return single_open(file, options_seq_show, PDE(inode)->data);
1857}
1858
1859static const struct file_operations ext4_seq_options_fops = {
1860 .owner = THIS_MODULE,
1861 .open = options_open_fs,
1862 .read = seq_read,
1863 .llseek = seq_lseek,
1864 .release = single_release,
1865};
1866
617ba13b 1867static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1868 int read_only)
1869{
617ba13b 1870 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1871 int res = 0;
1872
617ba13b 1873 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1874 ext4_msg(sb, KERN_ERR, "revision level too high, "
1875 "forcing read-only mode");
ac27a0ec
DK		 1876 res = MS_RDONLY;
1877 }
1878 if (read_only)
281b5995 1879 goto done;
617ba13b 1880 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1881 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1882 "running e2fsck is recommended");
617ba13b 1883 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1884 ext4_msg(sb, KERN_WARNING,
1885 "warning: mounting fs with errors, "
1886 "running e2fsck is recommended");
ed3ce80a 1887 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1888 le16_to_cpu(es->s_mnt_count) >=
1889 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1890 ext4_msg(sb, KERN_WARNING,
1891 "warning: maximal mount count reached, "
1892 "running e2fsck is recommended");
ac27a0ec
DK		 1893 else if (le32_to_cpu(es->s_checkinterval) &&
1894 (le32_to_cpu(es->s_lastcheck) +
1895 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1896 ext4_msg(sb, KERN_WARNING,
1897 "warning: checktime reached, "
1898 "running e2fsck is recommended");
0b8e58a1 1899 if (!sbi->s_journal)
0390131b 1900 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1901 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1902 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1903 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1904 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1905 ext4_update_dynamic_rev(sb);
0390131b
FM		 1906 if (sbi->s_journal)
1907 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1908
e2d67052 1909 ext4_commit_super(sb, 1);
281b5995 1910done:
ac27a0ec 1911 if (test_opt(sb, DEBUG))
a9df9a49 1912 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1913 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1914 sb->s_blocksize,
1915 sbi->s_groups_count,
617ba13b
MC		 1916 EXT4_BLOCKS_PER_GROUP(sb),
1917 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1918 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1919
7abc52c2 1920 cleancache_init_fs(sb);
ac27a0ec
DK		 1921 return res;
1922}
1923
772cb7c8
JS		 1924static int ext4_fill_flex_info(struct super_block *sb)
1925{
1926 struct ext4_sb_info *sbi = EXT4_SB(sb);
1927 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1928 ext4_group_t flex_group_count;
1929 ext4_group_t flex_group;
d50f2ab6 1930 unsigned int groups_per_flex = 0;
c5ca7c76 1931 size_t size;
772cb7c8
JS		 1932 int i;
1933
503358ae 1934 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1935 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1936 sbi->s_log_groups_per_flex = 0;
1937 return 1;
1938 }
d50f2ab6 1939 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1940
c62a11fd
FB		 1941 /* We allocate both existing and potentially added groups */
1942 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1943 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1944 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1945 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1946 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1947 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1948 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1949 flex_group_count);
1950 goto failed;
772cb7c8 1951 }
772cb7c8 1952
772cb7c8 1953 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1954 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1955
1956 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1957 atomic_add(ext4_free_inodes_count(sb, gdp),
1958 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1959 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1960 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1961 atomic_add(ext4_used_dirs_count(sb, gdp),
1962 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1963 }
1964
1965 return 1;
1966failed:
1967 return 0;
1968}
1969
feb0ab32
DW		 1970static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1971 struct ext4_group_desc *gdp)
717d50e4 1972{
feb0ab32 1973 int offset;
717d50e4 1974 __u16 crc = 0;
feb0ab32 1975 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1976
feb0ab32
DW		 1977 if ((sbi->s_es->s_feature_ro_compat &
1978 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1979 /* Use new metadata_csum algorithm */
1980 __u16 old_csum;
1981 __u32 csum32;
1982
1983 old_csum = gdp->bg_checksum;
1984 gdp->bg_checksum = 0;
1985 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1986 sizeof(le_group));
1987 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1988 sbi->s_desc_size);
1989 gdp->bg_checksum = old_csum;
1990
1991 crc = csum32 & 0xFFFF;
1992 goto out;
717d50e4
AD		 1993 }
1994
feb0ab32
DW		 1995 /* old crc16 code */
1996 offset = offsetof(struct ext4_group_desc, bg_checksum);
1997
1998 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1999 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2000 crc = crc16(crc, (__u8 *)gdp, offset);
2001 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2002 /* for checksum of struct ext4_group_desc do the rest...*/
2003 if ((sbi->s_es->s_feature_incompat &
2004 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2005 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2006 crc = crc16(crc, (__u8 *)gdp + offset,
2007 le16_to_cpu(sbi->s_es->s_desc_size) -
2008 offset);
2009
2010out:
717d50e4
AD		 2011 return cpu_to_le16(crc);
2012}
2013
feb0ab32 2014int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2015 struct ext4_group_desc *gdp)
2016{
feb0ab32
DW		 2017 if (ext4_has_group_desc_csum(sb) &&
2018 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2019 block_group, gdp)))
717d50e4
AD		 2020 return 0;
2021
2022 return 1;
2023}
2024
feb0ab32
DW		 2025void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2026 struct ext4_group_desc *gdp)
2027{
2028 if (!ext4_has_group_desc_csum(sb))
2029 return;
2030 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2031}
2032
ac27a0ec 2033/* Called at mount-time, super-block is locked */
bfff6873
LC		 2034static int ext4_check_descriptors(struct super_block *sb,
2035 ext4_group_t *first_not_zeroed)
ac27a0ec 2036{
617ba13b
MC		 2037 struct ext4_sb_info *sbi = EXT4_SB(sb);
2038 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2039 ext4_fsblk_t last_block;
bd81d8ee
LV		 2040 ext4_fsblk_t block_bitmap;
2041 ext4_fsblk_t inode_bitmap;
2042 ext4_fsblk_t inode_table;
ce421581 2043 int flexbg_flag = 0;
bfff6873 2044 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2045
ce421581
JS		 2046 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2047 flexbg_flag = 1;
2048
af5bc92d 2049 ext4_debug("Checking group descriptors");
ac27a0ec 2050
197cd65a
AM		 2051 for (i = 0; i < sbi->s_groups_count; i++) {
2052 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2053
ce421581 2054 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2055 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2056 else
2057 last_block = first_block +
617ba13b 2058 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2059
bfff6873
LC		 2060 if ((grp == sbi->s_groups_count) &&
2061 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2062 grp = i;
2063
8fadc143 2064 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2065 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2066 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2067 "Block bitmap for group %u not in group "
b31e1552 2068 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2069 return 0;
2070 }
8fadc143 2071 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2072 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2073 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2074 "Inode bitmap for group %u not in group "
b31e1552 2075 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2076 return 0;
2077 }
8fadc143 2078 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2079 if (inode_table < first_block ||
2b2d6d01 2080 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2081 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2082 "Inode table for group %u not in group "
b31e1552 2083 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2084 return 0;
2085 }
955ce5f5 2086 ext4_lock_group(sb, i);
feb0ab32 2087 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2088 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2089 "Checksum for group %u failed (%u!=%u)",
2090 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2091 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2092 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2093 ext4_unlock_group(sb, i);
8a266467 2094 return 0;
7ee1ec4c 2095 }
717d50e4 2096 }
955ce5f5 2097 ext4_unlock_group(sb, i);
ce421581
JS		 2098 if (!flexbg_flag)
2099 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2100 }
bfff6873
LC		 2101 if (NULL != first_not_zeroed)
2102 *first_not_zeroed = grp;
ac27a0ec 2103
5dee5437
TT		 2104 ext4_free_blocks_count_set(sbi->s_es,
2105 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2106 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2107 return 1;
2108}
2109
617ba13b 2110/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2111 * the superblock) which were deleted from all directories, but held open by
2112 * a process at the time of a crash. We walk the list and try to delete these
2113 * inodes at recovery time (only with a read-write filesystem).
2114 *
2115 * In order to keep the orphan inode chain consistent during traversal (in
2116 * case of crash during recovery), we link each inode into the superblock
2117 * orphan list_head and handle it the same way as an inode deletion during
2118 * normal operation (which journals the operations for us).
2119 *
2120 * We only do an iget() and an iput() on each inode, which is very safe if we
2121 * accidentally point at an in-use or already deleted inode. The worst that
2122 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2123 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2124 * e2fsck was run on this filesystem, and it must have already done the orphan
2125 * inode cleanup for us, so we can safely abort without any further action.
2126 */
2b2d6d01
TT		 2127static void ext4_orphan_cleanup(struct super_block *sb,
2128 struct ext4_super_block *es)
ac27a0ec
DK		 2129{
2130 unsigned int s_flags = sb->s_flags;
2131 int nr_orphans = 0, nr_truncates = 0;
2132#ifdef CONFIG_QUOTA
2133 int i;
2134#endif
2135 if (!es->s_last_orphan) {
2136 jbd_debug(4, "no orphan inodes to clean up\n");
2137 return;
2138 }
2139
a8f48a95 2140 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2141 ext4_msg(sb, KERN_ERR, "write access "
2142 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2143 return;
2144 }
2145
d39195c3
AG		 2146 /* Check if feature set would not allow a r/w mount */
2147 if (!ext4_feature_set_ok(sb, 0)) {
2148 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2149 "unknown ROCOMPAT features");
2150 return;
2151 }
2152
617ba13b 2153 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2154 if (es->s_last_orphan)
2155 jbd_debug(1, "Errors on filesystem, "
2156 "clearing orphan list.\n");
2157 es->s_last_orphan = 0;
2158 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2159 return;
2160 }
2161
2162 if (s_flags & MS_RDONLY) {
b31e1552 2163 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2164 sb->s_flags &= ~MS_RDONLY;
2165 }
2166#ifdef CONFIG_QUOTA
2167 /* Needed for iput() to work correctly and not trash data */
2168 sb->s_flags |= MS_ACTIVE;
2169 /* Turn on quotas so that they are updated correctly */
2170 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2171 if (EXT4_SB(sb)->s_qf_names[i]) {
2172 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2173 if (ret < 0)
b31e1552
ES		 2174 ext4_msg(sb, KERN_ERR,
2175 "Cannot turn on journaled "
2176 "quota: error %d", ret);
ac27a0ec
DK		 2177 }
2178 }
2179#endif
2180
2181 while (es->s_last_orphan) {
2182 struct inode *inode;
2183
97bd42b9
JB		 2184 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2185 if (IS_ERR(inode)) {
ac27a0ec
DK		 2186 es->s_last_orphan = 0;
2187 break;
2188 }
2189
617ba13b 2190 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2191 dquot_initialize(inode);
ac27a0ec 2192 if (inode->i_nlink) {
b31e1552
ES		 2193 ext4_msg(sb, KERN_DEBUG,
2194 "%s: truncating inode %lu to %lld bytes",
46e665e9 2195 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2196 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2197 inode->i_ino, inode->i_size);
617ba13b 2198 ext4_truncate(inode);
ac27a0ec
DK		 2199 nr_truncates++;
2200 } else {
b31e1552
ES		 2201 ext4_msg(sb, KERN_DEBUG,
2202 "%s: deleting unreferenced inode %lu",
46e665e9 2203 __func__, inode->i_ino);
ac27a0ec
DK		 2204 jbd_debug(2, "deleting unreferenced inode %lu\n",
2205 inode->i_ino);
2206 nr_orphans++;
2207 }
2208 iput(inode); /* The delete magic happens here! */
2209 }
2210
2b2d6d01 2211#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2212
2213 if (nr_orphans)
b31e1552
ES		 2214 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2215 PLURAL(nr_orphans));
ac27a0ec 2216 if (nr_truncates)
b31e1552
ES		 2217 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2218 PLURAL(nr_truncates));
ac27a0ec
DK		 2219#ifdef CONFIG_QUOTA
2220 /* Turn quotas off */
2221 for (i = 0; i < MAXQUOTAS; i++) {
2222 if (sb_dqopt(sb)->files[i])
287a8095 2223 dquot_quota_off(sb, i);
ac27a0ec
DK		 2224 }
2225#endif
2226 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2227}
0b8e58a1 2228
cd2291a4
ES		 2229/*
2230 * Maximal extent format file size.
2231 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2232 * extent format containers, within a sector_t, and within i_blocks
2233 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2234 * so that won't be a limiting factor.
2235 *
f17722f9
LC		 2236 * However there is other limiting factor. We do store extents in the form
2237 * of starting block and length, hence the resulting length of the extent
2238 * covering maximum file size must fit into on-disk format containers as
2239 * well. Given that length is always by 1 unit bigger than max unit (because
2240 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2241 *
cd2291a4
ES		 2242 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2243 */
f287a1a5 2244static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2245{
2246 loff_t res;
2247 loff_t upper_limit = MAX_LFS_FILESIZE;
2248
2249 /* small i_blocks in vfs inode? */
f287a1a5 2250 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2251 /*
90c699a9 2252 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2253 * i_block represent total blocks in 512 bytes
2254 * 32 == size of vfs inode i_blocks * 8
2255 */
2256 upper_limit = (1LL << 32) - 1;
2257
2258 /* total blocks in file system block size */
2259 upper_limit >>= (blkbits - 9);
2260 upper_limit <<= blkbits;
2261 }
2262
f17722f9
LC		 2263 /*
2264 * 32-bit extent-start container, ee_block. We lower the maxbytes
2265 * by one fs block, so ee_len can cover the extent of maximum file
2266 * size
2267 */
2268 res = (1LL << 32) - 1;
cd2291a4 2269 res <<= blkbits;
cd2291a4
ES		 2270
2271 /* Sanity check against vm- & vfs- imposed limits */
2272 if (res > upper_limit)
2273 res = upper_limit;
2274
2275 return res;
2276}
ac27a0ec 2277
ac27a0ec 2278/*
cd2291a4 2279 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2280 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2281 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2282 */
f287a1a5 2283static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2284{
617ba13b 2285 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2286 int meta_blocks;
2287 loff_t upper_limit;
0b8e58a1
AD		 2288 /* This is calculated to be the largest file size for a dense, block
2289 * mapped file such that the file's total number of 512-byte sectors,
2290 * including data and all indirect blocks, does not exceed (2^48 - 1).
2291 *
2292 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2293 * number of 512-byte sectors of the file.
0fc1b451
AK		 2294 */
2295
f287a1a5 2296 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2297 /*
90c699a9 2298 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2299 * the inode i_block field represents total file blocks in
2300 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2301 */
2302 upper_limit = (1LL << 32) - 1;
2303
2304 /* total blocks in file system block size */
2305 upper_limit >>= (bits - 9);
2306
2307 } else {
8180a562
AK		 2308 /*
2309 * We use 48 bit ext4_inode i_blocks
2310 * With EXT4_HUGE_FILE_FL set the i_blocks
2311 * represent total number of blocks in
2312 * file system block size
2313 */
0fc1b451
AK		 2314 upper_limit = (1LL << 48) - 1;
2315
0fc1b451
AK		 2316 }
2317
2318 /* indirect blocks */
2319 meta_blocks = 1;
2320 /* double indirect blocks */
2321 meta_blocks += 1 + (1LL << (bits-2));
2322 /* tripple indirect blocks */
2323 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2324
2325 upper_limit -= meta_blocks;
2326 upper_limit <<= bits;
ac27a0ec
DK		 2327
2328 res += 1LL << (bits-2);
2329 res += 1LL << (2*(bits-2));
2330 res += 1LL << (3*(bits-2));
2331 res <<= bits;
2332 if (res > upper_limit)
2333 res = upper_limit;
0fc1b451
AK		 2334
2335 if (res > MAX_LFS_FILESIZE)
2336 res = MAX_LFS_FILESIZE;
2337
ac27a0ec
DK		 2338 return res;
2339}
2340
617ba13b 2341static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2342 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2343{
617ba13b 2344 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2345 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2346 int has_super = 0;
2347
2348 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2349
617ba13b 2350 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2351 nr < first_meta_bg)
70bbb3e0 2352 return logical_sb_block + nr + 1;
ac27a0ec 2353 bg = sbi->s_desc_per_block * nr;
617ba13b 2354 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2355 has_super = 1;
0b8e58a1 2356
617ba13b 2357 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2358}
2359
c9de560d
AT		 2360/**
2361 * ext4_get_stripe_size: Get the stripe size.
2362 * @sbi: In memory super block info
2363 *
2364 * If we have specified it via mount option, then
2365 * use the mount option value. If the value specified at mount time is
2366 * greater than the blocks per group use the super block value.
2367 * If the super block value is greater than blocks per group return 0.
2368 * Allocator needs it be less than blocks per group.
2369 *
2370 */
2371static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2372{
2373 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2374 unsigned long stripe_width =
2375 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2376 int ret;
c9de560d
AT		 2377
2378 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2379 ret = sbi->s_stripe;
2380 else if (stripe_width <= sbi->s_blocks_per_group)
2381 ret = stripe_width;
2382 else if (stride <= sbi->s_blocks_per_group)
2383 ret = stride;
2384 else
2385 ret = 0;
c9de560d 2386
3eb08658
DE		 2387 /*
2388 * If the stripe width is 1, this makes no sense and
2389 * we set it to 0 to turn off stripe handling code.
2390 */
2391 if (ret <= 1)
2392 ret = 0;
c9de560d 2393
3eb08658 2394 return ret;
c9de560d 2395}
ac27a0ec 2396
3197ebdb
TT		 2397/* sysfs supprt */
2398
2399struct ext4_attr {
2400 struct attribute attr;
2401 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2402 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2403 const char *, size_t);
2404 int offset;
2405};
2406
2407static int parse_strtoul(const char *buf,
2408 unsigned long max, unsigned long *value)
2409{
2410 char *endp;
2411
e7d2860b
AGR		 2412 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2413 endp = skip_spaces(endp);
3197ebdb
TT		 2414 if (*endp || *value > max)
2415 return -EINVAL;
2416
2417 return 0;
2418}
2419
2420static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2421 struct ext4_sb_info *sbi,
2422 char *buf)
2423{
2424 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2425 (s64) EXT4_C2B(sbi,
2426 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2427}
2428
2429static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2430 struct ext4_sb_info *sbi, char *buf)
2431{
2432 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2433
f613dfcb
TT		 2434 if (!sb->s_bdev->bd_part)
2435 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2436 return snprintf(buf, PAGE_SIZE, "%lu\n",
2437 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2438 sbi->s_sectors_written_start) >> 1);
2439}
2440
2441static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2442 struct ext4_sb_info *sbi, char *buf)
2443{
2444 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2445
f613dfcb
TT		 2446 if (!sb->s_bdev->bd_part)
2447 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2448 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2449 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2450 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2451 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2452}
2453
2454static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2455 struct ext4_sb_info *sbi,
2456 const char *buf, size_t count)
2457{
2458 unsigned long t;
2459
2460 if (parse_strtoul(buf, 0x40000000, &t))
2461 return -EINVAL;
2462
5dbd571d 2463 if (t && !is_power_of_2(t))
3197ebdb
TT		 2464 return -EINVAL;
2465
2466 sbi->s_inode_readahead_blks = t;
2467 return count;
2468}
2469
2470static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2471 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2472{
2473 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2474
2475 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2476}
2477
2478static ssize_t sbi_ui_store(struct ext4_attr *a,
2479 struct ext4_sb_info *sbi,
2480 const char *buf, size_t count)
2481{
2482 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2483 unsigned long t;
2484
2485 if (parse_strtoul(buf, 0xffffffff, &t))
2486 return -EINVAL;
2487 *ui = t;
2488 return count;
2489}
2490
2c0544b2
TT		 2491static ssize_t trigger_test_error(struct ext4_attr *a,
2492 struct ext4_sb_info *sbi,
2493 const char *buf, size_t count)
2494{
2495 int len = count;
2496
2497 if (!capable(CAP_SYS_ADMIN))
2498 return -EPERM;
2499
2500 if (len && buf[len-1] == '\n')
2501 len--;
2502
2503 if (len)
2504 ext4_error(sbi->s_sb, "%.*s", len, buf);
2505 return count;
2506}
2507
3197ebdb
TT		 2508#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2509static struct ext4_attr ext4_attr_##_name = { \
2510 .attr = {.name = __stringify(_name), .mode = _mode }, \
2511 .show = _show, \
2512 .store = _store, \
2513 .offset = offsetof(struct ext4_sb_info, _elname), \
2514}
2515#define EXT4_ATTR(name, mode, show, store) \
2516static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2517
857ac889 2518#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2519#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2520#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2521#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2522 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2523#define ATTR_LIST(name) &ext4_attr_##name.attr
2524
2525EXT4_RO_ATTR(delayed_allocation_blocks);
2526EXT4_RO_ATTR(session_write_kbytes);
2527EXT4_RO_ATTR(lifetime_write_kbytes);
2528EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2529 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2530EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2531EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2532EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2533EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2534EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2535EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2536EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2537EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2c0544b2 2538EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2539
2540static struct attribute *ext4_attrs[] = {
2541 ATTR_LIST(delayed_allocation_blocks),
2542 ATTR_LIST(session_write_kbytes),
2543 ATTR_LIST(lifetime_write_kbytes),
2544 ATTR_LIST(inode_readahead_blks),
11013911 2545 ATTR_LIST(inode_goal),
3197ebdb
TT		 2546 ATTR_LIST(mb_stats),
2547 ATTR_LIST(mb_max_to_scan),
2548 ATTR_LIST(mb_min_to_scan),
2549 ATTR_LIST(mb_order2_req),
2550 ATTR_LIST(mb_stream_req),
2551 ATTR_LIST(mb_group_prealloc),
55138e0b 2552 ATTR_LIST(max_writeback_mb_bump),
2c0544b2 2553 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2554 NULL,
2555};
2556
857ac889
LC		 2557/* Features this copy of ext4 supports */
2558EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2559EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2560
2561static struct attribute *ext4_feat_attrs[] = {
2562 ATTR_LIST(lazy_itable_init),
27ee40df 2563 ATTR_LIST(batched_discard),
857ac889
LC		 2564 NULL,
2565};
2566
3197ebdb
TT		 2567static ssize_t ext4_attr_show(struct kobject *kobj,
2568 struct attribute *attr, char *buf)
2569{
2570 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2571 s_kobj);
2572 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2573
2574 return a->show ? a->show(a, sbi, buf) : 0;
2575}
2576
2577static ssize_t ext4_attr_store(struct kobject *kobj,
2578 struct attribute *attr,
2579 const char *buf, size_t len)
2580{
2581 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2582 s_kobj);
2583 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2584
2585 return a->store ? a->store(a, sbi, buf, len) : 0;
2586}
2587
2588static void ext4_sb_release(struct kobject *kobj)
2589{
2590 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2591 s_kobj);
2592 complete(&sbi->s_kobj_unregister);
2593}
2594
52cf25d0 2595static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2596 .show = ext4_attr_show,
2597 .store = ext4_attr_store,
2598};
2599
2600static struct kobj_type ext4_ktype = {
2601 .default_attrs = ext4_attrs,
2602 .sysfs_ops = &ext4_attr_ops,
2603 .release = ext4_sb_release,
2604};
2605
857ac889
LC		 2606static void ext4_feat_release(struct kobject *kobj)
2607{
2608 complete(&ext4_feat->f_kobj_unregister);
2609}
2610
2611static struct kobj_type ext4_feat_ktype = {
2612 .default_attrs = ext4_feat_attrs,
2613 .sysfs_ops = &ext4_attr_ops,
2614 .release = ext4_feat_release,
2615};
2616
a13fb1a4
ES		 2617/*
2618 * Check whether this filesystem can be mounted based on
2619 * the features present and the RDONLY/RDWR mount requested.
2620 * Returns 1 if this filesystem can be mounted as requested,
2621 * 0 if it cannot be.
2622 */
2623static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2624{
2625 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2626 ext4_msg(sb, KERN_ERR,
2627 "Couldn't mount because of "
2628 "unsupported optional features (%x)",
2629 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2630 ~EXT4_FEATURE_INCOMPAT_SUPP));
2631 return 0;
2632 }
2633
2634 if (readonly)
2635 return 1;
2636
2637 /* Check that feature set is OK for a read-write mount */
2638 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2639 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2640 "unsupported optional features (%x)",
2641 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2642 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2643 return 0;
2644 }
2645 /*
2646 * Large file size enabled file system can only be mounted
2647 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2648 */
2649 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2650 if (sizeof(blkcnt_t) < sizeof(u64)) {
2651 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2652 "cannot be mounted RDWR without "
2653 "CONFIG_LBDAF");
2654 return 0;
2655 }
2656 }
bab08ab9
TT		 2657 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2658 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2659 ext4_msg(sb, KERN_ERR,
2660 "Can't support bigalloc feature without "
2661 "extents feature\n");
2662 return 0;
2663 }
a13fb1a4
ES		 2664 return 1;
2665}
2666
66e61a9e
TT		 2667/*
2668 * This function is called once a day if we have errors logged
2669 * on the file system
2670 */
2671static void print_daily_error_info(unsigned long arg)
2672{
2673 struct super_block *sb = (struct super_block *) arg;
2674 struct ext4_sb_info *sbi;
2675 struct ext4_super_block *es;
2676
2677 sbi = EXT4_SB(sb);
2678 es = sbi->s_es;
2679
2680 if (es->s_error_count)
2681 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2682 le32_to_cpu(es->s_error_count));
2683 if (es->s_first_error_time) {
2684 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2685 sb->s_id, le32_to_cpu(es->s_first_error_time),
2686 (int) sizeof(es->s_first_error_func),
2687 es->s_first_error_func,
2688 le32_to_cpu(es->s_first_error_line));
2689 if (es->s_first_error_ino)
2690 printk(": inode %u",
2691 le32_to_cpu(es->s_first_error_ino));
2692 if (es->s_first_error_block)
2693 printk(": block %llu", (unsigned long long)
2694 le64_to_cpu(es->s_first_error_block));
2695 printk("\n");
2696 }
2697 if (es->s_last_error_time) {
2698 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2699 sb->s_id, le32_to_cpu(es->s_last_error_time),
2700 (int) sizeof(es->s_last_error_func),
2701 es->s_last_error_func,
2702 le32_to_cpu(es->s_last_error_line));
2703 if (es->s_last_error_ino)
2704 printk(": inode %u",
2705 le32_to_cpu(es->s_last_error_ino));
2706 if (es->s_last_error_block)
2707 printk(": block %llu", (unsigned long long)
2708 le64_to_cpu(es->s_last_error_block));
2709 printk("\n");
2710 }
2711 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2712}
2713
bfff6873
LC		 2714/* Find next suitable group and run ext4_init_inode_table */
2715static int ext4_run_li_request(struct ext4_li_request *elr)
2716{
2717 struct ext4_group_desc *gdp = NULL;
2718 ext4_group_t group, ngroups;
2719 struct super_block *sb;
2720 unsigned long timeout = 0;
2721 int ret = 0;
2722
2723 sb = elr->lr_super;
2724 ngroups = EXT4_SB(sb)->s_groups_count;
2725
2726 for (group = elr->lr_next_group; group < ngroups; group++) {
2727 gdp = ext4_get_group_desc(sb, group, NULL);
2728 if (!gdp) {
2729 ret = 1;
2730 break;
2731 }
2732
2733 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2734 break;
2735 }
2736
2737 if (group == ngroups)
2738 ret = 1;
2739
2740 if (!ret) {
2741 timeout = jiffies;
2742 ret = ext4_init_inode_table(sb, group,
2743 elr->lr_timeout ? 0 : 1);
2744 if (elr->lr_timeout == 0) {
51ce6511
LC		 2745 timeout = (jiffies - timeout) *
2746 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2747 elr->lr_timeout = timeout;
2748 }
2749 elr->lr_next_sched = jiffies + elr->lr_timeout;
2750 elr->lr_next_group = group + 1;
2751 }
2752
2753 return ret;
2754}
2755
2756/*
2757 * Remove lr_request from the list_request and free the
4ed5c033 2758 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2759 */
2760static void ext4_remove_li_request(struct ext4_li_request *elr)
2761{
2762 struct ext4_sb_info *sbi;
2763
2764 if (!elr)
2765 return;
2766
2767 sbi = elr->lr_sbi;
2768
2769 list_del(&elr->lr_request);
2770 sbi->s_li_request = NULL;
2771 kfree(elr);
2772}
2773
2774static void ext4_unregister_li_request(struct super_block *sb)
2775{
1bb933fb
LC		 2776 mutex_lock(&ext4_li_mtx);
2777 if (!ext4_li_info) {
2778 mutex_unlock(&ext4_li_mtx);
bfff6873 2779 return;
1bb933fb 2780 }
bfff6873
LC		 2781
2782 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2783 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2784 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2785 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2786}
2787
8f1f7453
ES		 2788static struct task_struct *ext4_lazyinit_task;
2789
bfff6873
LC		 2790/*
2791 * This is the function where ext4lazyinit thread lives. It walks
2792 * through the request list searching for next scheduled filesystem.
2793 * When such a fs is found, run the lazy initialization request
2794 * (ext4_rn_li_request) and keep track of the time spend in this
2795 * function. Based on that time we compute next schedule time of
2796 * the request. When walking through the list is complete, compute
2797 * next waking time and put itself into sleep.
2798 */
2799static int ext4_lazyinit_thread(void *arg)
2800{
2801 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2802 struct list_head *pos, *n;
2803 struct ext4_li_request *elr;
4ed5c033 2804 unsigned long next_wakeup, cur;
bfff6873
LC		 2805
2806 BUG_ON(NULL == eli);
2807
bfff6873
LC		 2808cont_thread:
2809 while (true) {
2810 next_wakeup = MAX_JIFFY_OFFSET;
2811
2812 mutex_lock(&eli->li_list_mtx);
2813 if (list_empty(&eli->li_request_list)) {
2814 mutex_unlock(&eli->li_list_mtx);
2815 goto exit_thread;
2816 }
2817
2818 list_for_each_safe(pos, n, &eli->li_request_list) {
2819 elr = list_entry(pos, struct ext4_li_request,
2820 lr_request);
2821
b2c78cd0
TT		 2822 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2823 if (ext4_run_li_request(elr) != 0) {
2824 /* error, remove the lazy_init job */
2825 ext4_remove_li_request(elr);
2826 continue;
2827 }
bfff6873
LC		 2828 }
2829
2830 if (time_before(elr->lr_next_sched, next_wakeup))
2831 next_wakeup = elr->lr_next_sched;
2832 }
2833 mutex_unlock(&eli->li_list_mtx);
2834
a0acae0e 2835 try_to_freeze();
bfff6873 2836
4ed5c033
LC		 2837 cur = jiffies;
2838 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2839 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2840 cond_resched();
2841 continue;
2842 }
2843
4ed5c033
LC		 2844 schedule_timeout_interruptible(next_wakeup - cur);
2845
8f1f7453
ES		 2846 if (kthread_should_stop()) {
2847 ext4_clear_request_list();
2848 goto exit_thread;
2849 }
bfff6873
LC		 2850 }
2851
2852exit_thread:
2853 /*
2854 * It looks like the request list is empty, but we need
2855 * to check it under the li_list_mtx lock, to prevent any
2856 * additions into it, and of course we should lock ext4_li_mtx
2857 * to atomically free the list and ext4_li_info, because at
2858 * this point another ext4 filesystem could be registering
2859 * new one.
2860 */
2861 mutex_lock(&ext4_li_mtx);
2862 mutex_lock(&eli->li_list_mtx);
2863 if (!list_empty(&eli->li_request_list)) {
2864 mutex_unlock(&eli->li_list_mtx);
2865 mutex_unlock(&ext4_li_mtx);
2866 goto cont_thread;
2867 }
2868 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2869 kfree(ext4_li_info);
2870 ext4_li_info = NULL;
2871 mutex_unlock(&ext4_li_mtx);
2872
2873 return 0;
2874}
2875
2876static void ext4_clear_request_list(void)
2877{
2878 struct list_head *pos, *n;
2879 struct ext4_li_request *elr;
2880
2881 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2882 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2883 elr = list_entry(pos, struct ext4_li_request,
2884 lr_request);
2885 ext4_remove_li_request(elr);
2886 }
2887 mutex_unlock(&ext4_li_info->li_list_mtx);
2888}
2889
2890static int ext4_run_lazyinit_thread(void)
2891{
8f1f7453
ES		 2892 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2893 ext4_li_info, "ext4lazyinit");
2894 if (IS_ERR(ext4_lazyinit_task)) {
2895 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2896 ext4_clear_request_list();
bfff6873
LC		 2897 kfree(ext4_li_info);
2898 ext4_li_info = NULL;
92b97816 2899 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2900 "initialization thread\n",
2901 err);
2902 return err;
2903 }
2904 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2905 return 0;
2906}
2907
2908/*
2909 * Check whether it make sense to run itable init. thread or not.
2910 * If there is at least one uninitialized inode table, return
2911 * corresponding group number, else the loop goes through all
2912 * groups and return total number of groups.
2913 */
2914static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2915{
2916 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2917 struct ext4_group_desc *gdp = NULL;
2918
2919 for (group = 0; group < ngroups; group++) {
2920 gdp = ext4_get_group_desc(sb, group, NULL);
2921 if (!gdp)
2922 continue;
2923
2924 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2925 break;
2926 }
2927
2928 return group;
2929}
2930
2931static int ext4_li_info_new(void)
2932{
2933 struct ext4_lazy_init *eli = NULL;
2934
2935 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2936 if (!eli)
2937 return -ENOMEM;
2938
bfff6873
LC		 2939 INIT_LIST_HEAD(&eli->li_request_list);
2940 mutex_init(&eli->li_list_mtx);
2941
bfff6873
LC		 2942 eli->li_state |= EXT4_LAZYINIT_QUIT;
2943
2944 ext4_li_info = eli;
2945
2946 return 0;
2947}
2948
2949static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2950 ext4_group_t start)
2951{
2952 struct ext4_sb_info *sbi = EXT4_SB(sb);
2953 struct ext4_li_request *elr;
2954 unsigned long rnd;
2955
2956 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2957 if (!elr)
2958 return NULL;
2959
2960 elr->lr_super = sb;
2961 elr->lr_sbi = sbi;
2962 elr->lr_next_group = start;
2963
2964 /*
2965 * Randomize first schedule time of the request to
2966 * spread the inode table initialization requests
2967 * better.
2968 */
2969 get_random_bytes(&rnd, sizeof(rnd));
2970 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2971 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2972
2973 return elr;
2974}
2975
2976static int ext4_register_li_request(struct super_block *sb,
2977 ext4_group_t first_not_zeroed)
2978{
2979 struct ext4_sb_info *sbi = EXT4_SB(sb);
2980 struct ext4_li_request *elr;
2981 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2982 int ret = 0;
bfff6873 2983
51ce6511
LC		 2984 if (sbi->s_li_request != NULL) {
2985 /*
2986 * Reset timeout so it can be computed again, because
2987 * s_li_wait_mult might have changed.
2988 */
2989 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2990 return 0;
51ce6511 2991 }
bfff6873
LC		 2992
2993 if (first_not_zeroed == ngroups ||
2994 (sb->s_flags & MS_RDONLY) ||
55ff3840 2995 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 2996 return 0;
bfff6873
LC		 2997
2998 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 2999 if (!elr)
3000 return -ENOMEM;
bfff6873
LC		 3001
3002 mutex_lock(&ext4_li_mtx);
3003
3004 if (NULL == ext4_li_info) {
3005 ret = ext4_li_info_new();
3006 if (ret)
3007 goto out;
3008 }
3009
3010 mutex_lock(&ext4_li_info->li_list_mtx);
3011 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3012 mutex_unlock(&ext4_li_info->li_list_mtx);
3013
3014 sbi->s_li_request = elr;
46e4690b
TM		 3015 /*
3016 * set elr to NULL here since it has been inserted to
3017 * the request_list and the removal and free of it is
3018 * handled by ext4_clear_request_list from now on.
3019 */
3020 elr = NULL;
bfff6873
LC		 3021
3022 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3023 ret = ext4_run_lazyinit_thread();
3024 if (ret)
3025 goto out;
3026 }
bfff6873 3027out:
beed5ecb
NK		 3028 mutex_unlock(&ext4_li_mtx);
3029 if (ret)
bfff6873 3030 kfree(elr);
bfff6873
LC		 3031 return ret;
3032}
3033
3034/*
3035 * We do not need to lock anything since this is called on
3036 * module unload.
3037 */
3038static void ext4_destroy_lazyinit_thread(void)
3039{
3040 /*
3041 * If thread exited earlier
3042 * there's nothing to be done.
3043 */
8f1f7453 3044 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3045 return;
3046
8f1f7453 3047 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3048}
3049
25ed6e8a
DW		 3050static int set_journal_csum_feature_set(struct super_block *sb)
3051{
3052 int ret = 1;
3053 int compat, incompat;
3054 struct ext4_sb_info *sbi = EXT4_SB(sb);
3055
3056 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3057 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3058 /* journal checksum v2 */
3059 compat = 0;
3060 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3061 } else {
3062 /* journal checksum v1 */
3063 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3064 incompat = 0;
3065 }
3066
3067 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3068 ret = jbd2_journal_set_features(sbi->s_journal,
3069 compat, 0,
3070 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3071 incompat);
3072 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3073 ret = jbd2_journal_set_features(sbi->s_journal,
3074 compat, 0,
3075 incompat);
3076 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3077 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3078 } else {
3079 jbd2_journal_clear_features(sbi->s_journal,
3080 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3081 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3082 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3083 }
3084
3085 return ret;
3086}
3087
952fc18e
TT		 3088/*
3089 * Note: calculating the overhead so we can be compatible with
3090 * historical BSD practice is quite difficult in the face of
3091 * clusters/bigalloc. This is because multiple metadata blocks from
3092 * different block group can end up in the same allocation cluster.
3093 * Calculating the exact overhead in the face of clustered allocation
3094 * requires either O(all block bitmaps) in memory or O(number of block
3095 * groups**2) in time. We will still calculate the superblock for
3096 * older file systems --- and if we come across with a bigalloc file
3097 * system with zero in s_overhead_clusters the estimate will be close to
3098 * correct especially for very large cluster sizes --- but for newer
3099 * file systems, it's better to calculate this figure once at mkfs
3100 * time, and store it in the superblock. If the superblock value is
3101 * present (even for non-bigalloc file systems), we will use it.
3102 */
3103static int count_overhead(struct super_block *sb, ext4_group_t grp,
3104 char *buf)
3105{
3106 struct ext4_sb_info *sbi = EXT4_SB(sb);
3107 struct ext4_group_desc *gdp;
3108 ext4_fsblk_t first_block, last_block, b;
3109 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3110 int s, j, count = 0;
3111
3112 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3113 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3114 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3115 for (i = 0; i < ngroups; i++) {
3116 gdp = ext4_get_group_desc(sb, i, NULL);
3117 b = ext4_block_bitmap(sb, gdp);
3118 if (b >= first_block && b <= last_block) {
3119 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3120 count++;
3121 }
3122 b = ext4_inode_bitmap(sb, gdp);
3123 if (b >= first_block && b <= last_block) {
3124 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3125 count++;
3126 }
3127 b = ext4_inode_table(sb, gdp);
3128 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3129 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3130 int c = EXT4_B2C(sbi, b - first_block);
3131 ext4_set_bit(c, buf);
3132 count++;
3133 }
3134 if (i != grp)
3135 continue;
3136 s = 0;
3137 if (ext4_bg_has_super(sb, grp)) {
3138 ext4_set_bit(s++, buf);
3139 count++;
3140 }
3141 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3142 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3143 count++;
3144 }
3145 }
3146 if (!count)
3147 return 0;
3148 return EXT4_CLUSTERS_PER_GROUP(sb) -
3149 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3150}
3151
3152/*
3153 * Compute the overhead and stash it in sbi->s_overhead
3154 */
3155int ext4_calculate_overhead(struct super_block *sb)
3156{
3157 struct ext4_sb_info *sbi = EXT4_SB(sb);
3158 struct ext4_super_block *es = sbi->s_es;
3159 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3160 ext4_fsblk_t overhead = 0;
3161 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3162
3163 memset(buf, 0, PAGE_SIZE);
3164 if (!buf)
3165 return -ENOMEM;
3166
3167 /*
3168 * Compute the overhead (FS structures). This is constant
3169 * for a given filesystem unless the number of block groups
3170 * changes so we cache the previous value until it does.
3171 */
3172
3173 /*
3174 * All of the blocks before first_data_block are overhead
3175 */
3176 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3177
3178 /*
3179 * Add the overhead found in each block group
3180 */
3181 for (i = 0; i < ngroups; i++) {
3182 int blks;
3183
3184 blks = count_overhead(sb, i, buf);
3185 overhead += blks;
3186 if (blks)
3187 memset(buf, 0, PAGE_SIZE);
3188 cond_resched();
3189 }
3190 sbi->s_overhead = overhead;
3191 smp_wmb();
3192 free_page((unsigned long) buf);
3193 return 0;
3194}
3195
2b2d6d01 3196static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3197{
d4c402d9 3198 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3199 struct buffer_head *bh;
617ba13b
MC		 3200 struct ext4_super_block *es = NULL;
3201 struct ext4_sb_info *sbi;
3202 ext4_fsblk_t block;
3203 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3204 ext4_fsblk_t logical_sb_block;
ac27a0ec 3205 unsigned long offset = 0;
ac27a0ec
DK		 3206 unsigned long journal_devnum = 0;
3207 unsigned long def_mount_opts;
3208 struct inode *root;
9f6200bb 3209 char *cp;
0390131b 3210 const char *descr;
dcc7dae3 3211 int ret = -ENOMEM;
281b5995 3212 int blocksize, clustersize;
4ec11028
TT		 3213 unsigned int db_count;
3214 unsigned int i;
281b5995 3215 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3216 __u64 blocks_count;
833f4077 3217 int err;
b3881f74 3218 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3219 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3220
3221 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3222 if (!sbi)
dcc7dae3 3223 goto out_free_orig;
705895b6
PE		 3224
3225 sbi->s_blockgroup_lock =
3226 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3227 if (!sbi->s_blockgroup_lock) {
3228 kfree(sbi);
dcc7dae3 3229 goto out_free_orig;
705895b6 3230 }
ac27a0ec 3231 sb->s_fs_info = sbi;
2c0544b2 3232 sbi->s_sb = sb;
ac27a0ec 3233 sbi->s_mount_opt = 0;
08cefc7a
EB		 3234 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3235 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
240799cd 3236 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3237 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3238 if (sb->s_bdev->bd_part)
3239 sbi->s_sectors_written_start =
3240 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3241
9f6200bb
TT		 3242 /* Cleanup superblock name */
3243 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3244 *cp = '!';
3245
dcc7dae3 3246 ret = -EINVAL;
617ba13b 3247 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3248 if (!blocksize) {
b31e1552 3249 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3250 goto out_fail;
3251 }
3252
3253 /*
617ba13b 3254 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3255 * block sizes. We need to calculate the offset from buffer start.
3256 */
617ba13b 3257 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3258 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3259 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3260 } else {
70bbb3e0 3261 logical_sb_block = sb_block;
ac27a0ec
DK		 3262 }
3263
70bbb3e0 3264 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3265 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3266 goto out_fail;
3267 }
3268 /*
3269 * Note: s_es must be initialized as soon as possible because
617ba13b 3270 * some ext4 macro-instructions depend on its value
ac27a0ec 3271 */
2716b802 3272 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3273 sbi->s_es = es;
3274 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3275 if (sb->s_magic != EXT4_SUPER_MAGIC)
3276 goto cantfind_ext4;
afc32f7e 3277 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3278
feb0ab32
DW		 3279 /* Warn if metadata_csum and gdt_csum are both set. */
3280 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3281 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3282 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3283 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3284 "redundant flags; please run fsck.");
3285
d25425f8
DW		 3286 /* Check for a known checksum algorithm */
3287 if (!ext4_verify_csum_type(sb, es)) {
3288 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3289 "unknown checksum algorithm.");
3290 silent = 1;
3291 goto cantfind_ext4;
3292 }
3293
0441984a
DW		 3294 /* Load the checksum driver */
3295 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3296 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3297 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3298 if (IS_ERR(sbi->s_chksum_driver)) {
3299 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3300 ret = PTR_ERR(sbi->s_chksum_driver);
3301 sbi->s_chksum_driver = NULL;
3302 goto failed_mount;
3303 }
3304 }
3305
a9c47317
DW		 3306 /* Check superblock checksum */
3307 if (!ext4_superblock_csum_verify(sb, es)) {
3308 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3309 "invalid superblock checksum. Run e2fsck?");
3310 silent = 1;
3311 goto cantfind_ext4;
3312 }
3313
3314 /* Precompute checksum seed for all metadata */
3315 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3316 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3317 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3318 sizeof(es->s_uuid));
3319
ac27a0ec
DK		 3320 /* Set defaults before we parse the mount options */
3321 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3322 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3323 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3324 set_opt(sb, DEBUG);
87f26807 3325 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3326 set_opt(sb, GRPID);
617ba13b 3327 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3328 set_opt(sb, NO_UID32);
ea663336 3329 /* xattr user namespace & acls are now defaulted on */
03010a33 3330#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3331 set_opt(sb, XATTR_USER);
2e7842b8 3332#endif
03010a33 3333#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3334 set_opt(sb, POSIX_ACL);
2e7842b8 3335#endif
6fd7a467 3336 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3337 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3338 set_opt(sb, JOURNAL_DATA);
617ba13b 3339 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3340 set_opt(sb, ORDERED_DATA);
617ba13b 3341 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3342 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3343
3344 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3345 set_opt(sb, ERRORS_PANIC);
bb4f397a 3346 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3347 set_opt(sb, ERRORS_CONT);
bb4f397a 3348 else
fd8c37ec 3349 set_opt(sb, ERRORS_RO);
8b67f04a 3350 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3351 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3352 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3353 set_opt(sb, DISCARD);
ac27a0ec 3354
08cefc7a
EB		 3355 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3356 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3357 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3358 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3359 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3360
8b67f04a 3361 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3362 set_opt(sb, BARRIER);
ac27a0ec 3363
dd919b98
AK		 3364 /*
3365 * enable delayed allocation by default
3366 * Use -o nodelalloc to turn it off
3367 */
8b67f04a
TT		 3368 if (!IS_EXT3_SB(sb) &&
3369 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3370 set_opt(sb, DELALLOC);
dd919b98 3371
51ce6511
LC		 3372 /*
3373 * set default s_li_wait_mult for lazyinit, for the case there is
3374 * no mount option specified.
3375 */
3376 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3377
8b67f04a 3378 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3379 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3380 ext4_msg(sb, KERN_WARNING,
3381 "failed to parse options in superblock: %s",
3382 sbi->s_es->s_mount_opts);
3383 }
5a916be1 3384 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3385 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3386 &journal_ioprio, 0))
ac27a0ec
DK		 3387 goto failed_mount;
3388
56889787
TT		 3389 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3390 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3391 "with data=journal disables delayed "
3392 "allocation and O_DIRECT support!\n");
3393 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3394 ext4_msg(sb, KERN_ERR, "can't mount with "
3395 "both data=journal and delalloc");
3396 goto failed_mount;
3397 }
3398 if (test_opt(sb, DIOREAD_NOLOCK)) {
3399 ext4_msg(sb, KERN_ERR, "can't mount with "
3400 "both data=journal and delalloc");
3401 goto failed_mount;
3402 }
3403 if (test_opt(sb, DELALLOC))
3404 clear_opt(sb, DELALLOC);
3405 }
3406
3407 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3408 if (test_opt(sb, DIOREAD_NOLOCK)) {
3409 if (blocksize < PAGE_SIZE) {
3410 ext4_msg(sb, KERN_ERR, "can't mount with "
3411 "dioread_nolock if block size != PAGE_SIZE");
3412 goto failed_mount;
3413 }
3414 }
3415
ac27a0ec 3416 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3417 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3418
617ba13b
MC		 3419 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3420 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3421 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3422 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3423 ext4_msg(sb, KERN_WARNING,
3424 "feature flags set on rev 0 fs, "
3425 "running e2fsck is recommended");
469108ff 3426
2035e776
TT		 3427 if (IS_EXT2_SB(sb)) {
3428 if (ext2_feature_set_ok(sb))
3429 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3430 "using the ext4 subsystem");
3431 else {
3432 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3433 "to feature incompatibilities");
3434 goto failed_mount;
3435 }
3436 }
3437
3438 if (IS_EXT3_SB(sb)) {
3439 if (ext3_feature_set_ok(sb))
3440 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3441 "using the ext4 subsystem");
3442 else {
3443 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3444 "to feature incompatibilities");
3445 goto failed_mount;
3446 }
3447 }
3448
ac27a0ec
DK		 3449 /*
3450 * Check feature flags regardless of the revision level, since we
3451 * previously didn't change the revision level when setting the flags,
3452 * so there is a chance incompat flags are set on a rev 0 filesystem.
3453 */
a13fb1a4 3454 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3455 goto failed_mount;
a13fb1a4 3456
617ba13b
MC		 3457 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3458 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3459 ext4_msg(sb, KERN_ERR,
3460 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3461 goto failed_mount;
3462 }
3463
ac27a0ec 3464 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3465 /* Validate the filesystem blocksize */
3466 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3467 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3468 blocksize);
ac27a0ec
DK		 3469 goto failed_mount;
3470 }
3471
2b2d6d01 3472 brelse(bh);
70bbb3e0
AM		 3473 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3474 offset = do_div(logical_sb_block, blocksize);
3475 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3476 if (!bh) {
b31e1552
ES		 3477 ext4_msg(sb, KERN_ERR,
3478 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3479 goto failed_mount;
3480 }
2716b802 3481 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3482 sbi->s_es = es;
617ba13b 3483 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3484 ext4_msg(sb, KERN_ERR,
3485 "Magic mismatch, very weird!");
ac27a0ec
DK		 3486 goto failed_mount;
3487 }
3488 }
3489
a13fb1a4
ES		 3490 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3491 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3492 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3493 has_huge_files);
3494 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3495
617ba13b
MC		 3496 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3497 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3498 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3499 } else {
3500 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3501 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3502 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3503 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3504 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3505 ext4_msg(sb, KERN_ERR,
3506 "unsupported inode size: %d",
2b2d6d01 3507 sbi->s_inode_size);
ac27a0ec
DK		 3508 goto failed_mount;
3509 }
ef7f3835
KS		 3510 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3511 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3512 }
0b8e58a1 3513
0d1ee42f
AR		 3514 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3515 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3516 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3517 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3518 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3519 ext4_msg(sb, KERN_ERR,
3520 "unsupported descriptor size %lu",
0d1ee42f
AR		 3521 sbi->s_desc_size);
3522 goto failed_mount;
3523 }
3524 } else
3525 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3526
ac27a0ec 3527 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3528 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3529 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3530 goto cantfind_ext4;
0b8e58a1 3531
617ba13b 3532 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3533 if (sbi->s_inodes_per_block == 0)
617ba13b 3534 goto cantfind_ext4;
ac27a0ec
DK		 3535 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3536 sbi->s_inodes_per_block;
0d1ee42f 3537 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3538 sbi->s_sbh = bh;
3539 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3540 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3541 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3542
2b2d6d01 3543 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3544 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3545 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3546 i = le32_to_cpu(es->s_flags);
3547 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3548 sbi->s_hash_unsigned = 3;
3549 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3550#ifdef __CHAR_UNSIGNED__
3551 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3552 sbi->s_hash_unsigned = 3;
3553#else
3554 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3555#endif
f99b2589 3556 }
ac27a0ec 3557
281b5995
TT		 3558 /* Handle clustersize */
3559 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3560 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3561 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3562 if (has_bigalloc) {
3563 if (clustersize < blocksize) {
3564 ext4_msg(sb, KERN_ERR,
3565 "cluster size (%d) smaller than "
3566 "block size (%d)", clustersize, blocksize);
3567 goto failed_mount;
3568 }
3569 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3570 le32_to_cpu(es->s_log_block_size);
3571 sbi->s_clusters_per_group =
3572 le32_to_cpu(es->s_clusters_per_group);
3573 if (sbi->s_clusters_per_group > blocksize * 8) {
3574 ext4_msg(sb, KERN_ERR,
3575 "#clusters per group too big: %lu",
3576 sbi->s_clusters_per_group);
3577 goto failed_mount;
3578 }
3579 if (sbi->s_blocks_per_group !=
3580 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3581 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3582 "clusters per group (%lu) inconsistent",
3583 sbi->s_blocks_per_group,
3584 sbi->s_clusters_per_group);
3585 goto failed_mount;
3586 }
3587 } else {
3588 if (clustersize != blocksize) {
3589 ext4_warning(sb, "fragment/cluster size (%d) != "
3590 "block size (%d)", clustersize,
3591 blocksize);
3592 clustersize = blocksize;
3593 }
3594 if (sbi->s_blocks_per_group > blocksize * 8) {
3595 ext4_msg(sb, KERN_ERR,
3596 "#blocks per group too big: %lu",
3597 sbi->s_blocks_per_group);
3598 goto failed_mount;
3599 }
3600 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3601 sbi->s_cluster_bits = 0;
ac27a0ec 3602 }
281b5995
TT		 3603 sbi->s_cluster_ratio = clustersize / blocksize;
3604
ac27a0ec 3605 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3606 ext4_msg(sb, KERN_ERR,
3607 "#inodes per group too big: %lu",
2b2d6d01 3608 sbi->s_inodes_per_group);
ac27a0ec
DK		 3609 goto failed_mount;
3610 }
3611
bf43d84b
ES		 3612 /*
3613 * Test whether we have more sectors than will fit in sector_t,
3614 * and whether the max offset is addressable by the page cache.
3615 */
5a9ae68a 3616 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3617 ext4_blocks_count(es));
5a9ae68a 3618 if (err) {
b31e1552 3619 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3620 " too large to mount safely on this system");
ac27a0ec 3621 if (sizeof(sector_t) < 8)
90c699a9 3622 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3623 ret = err;
ac27a0ec
DK		 3624 goto failed_mount;
3625 }
3626
617ba13b
MC		 3627 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3628 goto cantfind_ext4;
e7c95593 3629
0f2ddca6
FTN		 3630 /* check blocks count against device size */
3631 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3632 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3633 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3634 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3635 ext4_blocks_count(es), blocks_count);
3636 goto failed_mount;
3637 }
3638
0b8e58a1
AD		 3639 /*
3640 * It makes no sense for the first data block to be beyond the end
3641 * of the filesystem.
3642 */
3643 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3644 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3645 "block %u is beyond end of filesystem (%llu)",
3646 le32_to_cpu(es->s_first_data_block),
3647 ext4_blocks_count(es));
e7c95593
ES		 3648 goto failed_mount;
3649 }
bd81d8ee
LV		 3650 blocks_count = (ext4_blocks_count(es) -
3651 le32_to_cpu(es->s_first_data_block) +
3652 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3653 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3654 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3655 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3656 "(block count %llu, first data block %u, "
b31e1552 3657 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3658 ext4_blocks_count(es),
3659 le32_to_cpu(es->s_first_data_block),
3660 EXT4_BLOCKS_PER_GROUP(sb));
3661 goto failed_mount;
3662 }
bd81d8ee 3663 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3664 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3665 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3666 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3667 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3668 sbi->s_group_desc = ext4_kvmalloc(db_count *
3669 sizeof(struct buffer_head *),
3670 GFP_KERNEL);
ac27a0ec 3671 if (sbi->s_group_desc == NULL) {
b31e1552 3672 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3673 ret = -ENOMEM;
ac27a0ec
DK		 3674 goto failed_mount;
3675 }
3676
9f6200bb
TT		 3677 if (ext4_proc_root)
3678 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3679
66acdcf4
TT		 3680 if (sbi->s_proc)
3681 proc_create_data("options", S_IRUGO, sbi->s_proc,
3682 &ext4_seq_options_fops, sb);
3683
705895b6 3684 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3685
3686 for (i = 0; i < db_count; i++) {
70bbb3e0 3687 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3688 sbi->s_group_desc[i] = sb_bread(sb, block);
3689 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3690 ext4_msg(sb, KERN_ERR,
3691 "can't read group descriptor %d", i);
ac27a0ec
DK		 3692 db_count = i;
3693 goto failed_mount2;
3694 }
3695 }
bfff6873 3696 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3697 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3698 goto failed_mount2;
3699 }
772cb7c8
JS		 3700 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3701 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3702 ext4_msg(sb, KERN_ERR,
3703 "unable to initialize "
3704 "flex_bg meta info!");
772cb7c8
JS		 3705 goto failed_mount2;
3706 }
3707
ac27a0ec
DK		 3708 sbi->s_gdb_count = db_count;
3709 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3710 spin_lock_init(&sbi->s_next_gen_lock);
3711
04496411
TM		 3712 init_timer(&sbi->s_err_report);
3713 sbi->s_err_report.function = print_daily_error_info;
3714 sbi->s_err_report.data = (unsigned long) sb;
3715
57042651 3716 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3717 ext4_count_free_clusters(sb));
ce7e010a
TT		 3718 if (!err) {
3719 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3720 ext4_count_free_inodes(sb));
3721 }
3722 if (!err) {
3723 err = percpu_counter_init(&sbi->s_dirs_counter,
3724 ext4_count_dirs(sb));
3725 }
3726 if (!err) {
57042651 3727 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3728 }
3729 if (err) {
3730 ext4_msg(sb, KERN_ERR, "insufficient memory");
2cde417d 3731 ret = err;
ce7e010a
TT		 3732 goto failed_mount3;
3733 }
3734
c9de560d 3735 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3736 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3737
ac27a0ec
DK		 3738 /*
3739 * set up enough so that it can read an inode
3740 */
9ca92389
TT		 3741 if (!test_opt(sb, NOLOAD) &&
3742 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3743 sb->s_op = &ext4_sops;
3744 else
3745 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3746 sb->s_export_op = &ext4_export_ops;
3747 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3748#ifdef CONFIG_QUOTA
617ba13b
MC		 3749 sb->s_qcop = &ext4_qctl_operations;
3750 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3751#endif
f2fa2ffc
AK		 3752 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3753
ac27a0ec 3754 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3755 mutex_init(&sbi->s_orphan_lock);
8f82f840 3756 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3757
3758 sb->s_root = NULL;
3759
3760 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3761 EXT4_HAS_INCOMPAT_FEATURE(sb,
3762 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3763
c5e06d10
JL		 3764 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3765 !(sb->s_flags & MS_RDONLY))
3766 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3767 goto failed_mount3;
3768
ac27a0ec
DK		 3769 /*
3770 * The first inode we look at is the journal inode. Don't try
3771 * root first: it may be modified in the journal!
3772 */
3773 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3774 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3775 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3776 goto failed_mount3;
0390131b
FM		 3777 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3778 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3779 ext4_msg(sb, KERN_ERR, "required journal recovery "
3780 "suppressed and not mounted read-only");
744692dc 3781 goto failed_mount_wq;
ac27a0ec 3782 } else {
fd8c37ec 3783 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3784 sbi->s_journal = NULL;
3785 needs_recovery = 0;
3786 goto no_journal;
ac27a0ec
DK		 3787 }
3788
f32aaf2d 3789 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3790 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3791 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3792 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3793 goto failed_mount_wq;
eb40a09c
JS		 3794 }
3795
25ed6e8a
DW		 3796 if (!set_journal_csum_feature_set(sb)) {
3797 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3798 "feature set");
3799 goto failed_mount_wq;
d4da6c9c 3800 }
818d276c 3801
ac27a0ec
DK		 3802 /* We have now updated the journal if required, so we can
3803 * validate the data journaling mode. */
3804 switch (test_opt(sb, DATA_FLAGS)) {
3805 case 0:
3806 /* No mode set, assume a default based on the journal
63f57933
AM		 3807 * capabilities: ORDERED_DATA if the journal can
3808 * cope, else JOURNAL_DATA
3809 */
dab291af
MC		 3810 if (jbd2_journal_check_available_features
3811 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3812 set_opt(sb, ORDERED_DATA);
ac27a0ec 3813 else
fd8c37ec 3814 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3815 break;
3816
617ba13b
MC		 3817 case EXT4_MOUNT_ORDERED_DATA:
3818 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3819 if (!jbd2_journal_check_available_features
3820 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3821 ext4_msg(sb, KERN_ERR, "Journal does not support "
3822 "requested data journaling mode");
744692dc 3823 goto failed_mount_wq;
ac27a0ec
DK		 3824 }
3825 default:
3826 break;
3827 }
b3881f74 3828 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3829
18aadd47
BJ		 3830 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3831
ce7e010a
TT		 3832 /*
3833 * The journal may have updated the bg summary counts, so we
3834 * need to update the global counters.
3835 */
57042651 3836 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3837 ext4_count_free_clusters(sb));
ce7e010a
TT		 3838 percpu_counter_set(&sbi->s_freeinodes_counter,
3839 ext4_count_free_inodes(sb));
3840 percpu_counter_set(&sbi->s_dirs_counter,
3841 ext4_count_dirs(sb));
57042651 3842 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3843
ce7e010a 3844no_journal:
952fc18e
TT		 3845 /*
3846 * Get the # of file system overhead blocks from the
3847 * superblock if present.
3848 */
3849 if (es->s_overhead_clusters)
3850 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3851 else {
3852 ret = ext4_calculate_overhead(sb);
3853 if (ret)
3854 goto failed_mount_wq;
3855 }
3856
fd89d5f2
TH		 3857 /*
3858 * The maximum number of concurrent works can be high and
3859 * concurrency isn't really necessary. Limit it to 1.
3860 */
3861 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3862 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3863 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3864 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3865 goto failed_mount_wq;
3866 }
3867
ac27a0ec 3868 /*
dab291af 3869 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3870 * so we can safely mount the rest of the filesystem now.
3871 */
3872
1d1fe1ee
DH		 3873 root = ext4_iget(sb, EXT4_ROOT_INO);
3874 if (IS_ERR(root)) {
b31e1552 3875 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3876 ret = PTR_ERR(root);
32a9bb57 3877 root = NULL;
ac27a0ec
DK		 3878 goto failed_mount4;
3879 }
3880 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3881 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3882 iput(root);
ac27a0ec
DK		 3883 goto failed_mount4;
3884 }
48fde701 3885 sb->s_root = d_make_root(root);
1d1fe1ee 3886 if (!sb->s_root) {
b31e1552 3887 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3888 ret = -ENOMEM;
3889 goto failed_mount4;
3890 }
ac27a0ec 3891
7e84b621
ES		 3892 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3893 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3894
3895 /* determine the minimum size of new large inodes, if present */
3896 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3897 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3898 EXT4_GOOD_OLD_INODE_SIZE;
3899 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3900 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3901 if (sbi->s_want_extra_isize <
3902 le16_to_cpu(es->s_want_extra_isize))
3903 sbi->s_want_extra_isize =
3904 le16_to_cpu(es->s_want_extra_isize);
3905 if (sbi->s_want_extra_isize <
3906 le16_to_cpu(es->s_min_extra_isize))
3907 sbi->s_want_extra_isize =
3908 le16_to_cpu(es->s_min_extra_isize);
3909 }
3910 }
3911 /* Check if enough inode space is available */
3912 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3913 sbi->s_inode_size) {
3914 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3915 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3916 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3917 "available");
ef7f3835
KS		 3918 }
3919
6fd058f7
TT		 3920 err = ext4_setup_system_zone(sb);
3921 if (err) {
b31e1552 3922 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3923 "zone (%d)", err);
94bf608a 3924 goto failed_mount4a;
6fd058f7
TT		 3925 }
3926
c2774d84 3927 ext4_ext_init(sb);
9d99012f 3928 err = ext4_mb_init(sb);
c2774d84 3929 if (err) {
421f91d2 3930 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3931 err);
dcf2d804 3932 goto failed_mount5;
c2774d84
AK		 3933 }
3934
bfff6873
LC		 3935 err = ext4_register_li_request(sb, first_not_zeroed);
3936 if (err)
dcf2d804 3937 goto failed_mount6;
bfff6873 3938
3197ebdb
TT		 3939 sbi->s_kobj.kset = ext4_kset;
3940 init_completion(&sbi->s_kobj_unregister);
3941 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3942 "%s", sb->s_id);
dcf2d804
TM		 3943 if (err)
3944 goto failed_mount7;
3197ebdb 3945
617ba13b
MC		 3946 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3947 ext4_orphan_cleanup(sb, es);
3948 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3949 if (needs_recovery) {
b31e1552 3950 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3951 ext4_mark_recovery_complete(sb, es);
3952 }
3953 if (EXT4_SB(sb)->s_journal) {
3954 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3955 descr = " journalled data mode";
3956 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3957 descr = " ordered data mode";
3958 else
3959 descr = " writeback data mode";
3960 } else
3961 descr = "out journal";
3962
d4c402d9 3963 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3964 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3965 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3966
66e61a9e
TT		 3967 if (es->s_error_count)
3968 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3969
d4c402d9 3970 kfree(orig_data);
ac27a0ec
DK		 3971 return 0;
3972
617ba13b 3973cantfind_ext4:
ac27a0ec 3974 if (!silent)
b31e1552 3975 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3976 goto failed_mount;
3977
dcf2d804
TM		 3978failed_mount7:
3979 ext4_unregister_li_request(sb);
3980failed_mount6:
dcf2d804 3981 ext4_mb_release(sb);
94bf608a
AV		 3982failed_mount5:
3983 ext4_ext_release(sb);
dcf2d804 3984 ext4_release_system_zone(sb);
94bf608a
AV		 3985failed_mount4a:
3986 dput(sb->s_root);
32a9bb57 3987 sb->s_root = NULL;
94bf608a 3988failed_mount4:
b31e1552 3989 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3990 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3991failed_mount_wq:
0390131b
FM		 3992 if (sbi->s_journal) {
3993 jbd2_journal_destroy(sbi->s_journal);
3994 sbi->s_journal = NULL;
3995 }
ac27a0ec 3996failed_mount3:
04496411 3997 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3998 if (sbi->s_flex_groups)
3999 ext4_kvfree(sbi->s_flex_groups);
57042651 4000 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4001 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4002 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4003 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 4004 if (sbi->s_mmp_tsk)
4005 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4006failed_mount2:
4007 for (i = 0; i < db_count; i++)
4008 brelse(sbi->s_group_desc[i]);
f18a5f21 4009 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4010failed_mount:
0441984a
DW		 4011 if (sbi->s_chksum_driver)
4012 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4013 if (sbi->s_proc) {
66acdcf4 4014 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4015 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4016 }
ac27a0ec
DK		 4017#ifdef CONFIG_QUOTA
4018 for (i = 0; i < MAXQUOTAS; i++)
4019 kfree(sbi->s_qf_names[i]);
4020#endif
617ba13b 4021 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4022 brelse(bh);
4023out_fail:
4024 sb->s_fs_info = NULL;
f6830165 4025 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4026 kfree(sbi);
dcc7dae3 4027out_free_orig:
d4c402d9 4028 kfree(orig_data);
1d1fe1ee 4029 return ret;
ac27a0ec
DK		 4030}
4031
4032/*
4033 * Setup any per-fs journal parameters now. We'll do this both on
4034 * initial mount, once the journal has been initialised but before we've
4035 * done any recovery; and again on any subsequent remount.
4036 */
617ba13b 4037static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4038{
617ba13b 4039 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4040
30773840
TT		 4041 journal->j_commit_interval = sbi->s_commit_interval;
4042 journal->j_min_batch_time = sbi->s_min_batch_time;
4043 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4044
a931da6a 4045 write_lock(&journal->j_state_lock);
ac27a0ec 4046 if (test_opt(sb, BARRIER))
dab291af 4047 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4048 else
dab291af 4049 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4050 if (test_opt(sb, DATA_ERR_ABORT))
4051 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4052 else
4053 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4054 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4055}
4056
617ba13b 4057static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4058 unsigned int journal_inum)
4059{
4060 struct inode *journal_inode;
4061 journal_t *journal;
4062
0390131b
FM		 4063 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4064
ac27a0ec
DK		 4065 /* First, test for the existence of a valid inode on disk. Bad
4066 * things happen if we iget() an unused inode, as the subsequent
4067 * iput() will try to delete it. */
4068
1d1fe1ee
DH		 4069 journal_inode = ext4_iget(sb, journal_inum);
4070 if (IS_ERR(journal_inode)) {
b31e1552 4071 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4072 return NULL;
4073 }
4074 if (!journal_inode->i_nlink) {
4075 make_bad_inode(journal_inode);
4076 iput(journal_inode);
b31e1552 4077 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4078 return NULL;
4079 }
4080
e5f8eab8 4081 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4082 journal_inode, journal_inode->i_size);
1d1fe1ee 4083 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4084 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4085 iput(journal_inode);
4086 return NULL;
4087 }
4088
dab291af 4089 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4090 if (!journal) {
b31e1552 4091 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4092 iput(journal_inode);
4093 return NULL;
4094 }
4095 journal->j_private = sb;
617ba13b 4096 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4097 return journal;
4098}
4099
617ba13b 4100static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4101 dev_t j_dev)
4102{
2b2d6d01 4103 struct buffer_head *bh;
ac27a0ec 4104 journal_t *journal;
617ba13b
MC		 4105 ext4_fsblk_t start;
4106 ext4_fsblk_t len;
ac27a0ec 4107 int hblock, blocksize;
617ba13b 4108 ext4_fsblk_t sb_block;
ac27a0ec 4109 unsigned long offset;
2b2d6d01 4110 struct ext4_super_block *es;
ac27a0ec
DK		 4111 struct block_device *bdev;
4112
0390131b
FM		 4113 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4114
b31e1552 4115 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4116 if (bdev == NULL)
4117 return NULL;
4118
ac27a0ec 4119 blocksize = sb->s_blocksize;
e1defc4f 4120 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4121 if (blocksize < hblock) {
b31e1552
ES		 4122 ext4_msg(sb, KERN_ERR,
4123 "blocksize too small for journal device");
ac27a0ec
DK		 4124 goto out_bdev;
4125 }
4126
617ba13b
MC		 4127 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4128 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4129 set_blocksize(bdev, blocksize);
4130 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4131 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4132 "external journal");
ac27a0ec
DK		 4133 goto out_bdev;
4134 }
4135
2716b802 4136 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4137 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4138 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4139 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4140 ext4_msg(sb, KERN_ERR, "external journal has "
4141 "bad superblock");
ac27a0ec
DK		 4142 brelse(bh);
4143 goto out_bdev;
4144 }
4145
617ba13b 4146 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4147 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4148 brelse(bh);
4149 goto out_bdev;
4150 }
4151
bd81d8ee 4152 len = ext4_blocks_count(es);
ac27a0ec
DK		 4153 start = sb_block + 1;
4154 brelse(bh); /* we're done with the superblock */
4155
dab291af 4156 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4157 start, len, blocksize);
4158 if (!journal) {
b31e1552 4159 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4160 goto out_bdev;
4161 }
4162 journal->j_private = sb;
4163 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4164 wait_on_buffer(journal->j_sb_buffer);
4165 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4166 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4167 goto out_journal;
4168 }
4169 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4170 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4171 "user (unsupported) - %d",
ac27a0ec
DK		 4172 be32_to_cpu(journal->j_superblock->s_nr_users));
4173 goto out_journal;
4174 }
617ba13b
MC		 4175 EXT4_SB(sb)->journal_bdev = bdev;
4176 ext4_init_journal_params(sb, journal);
ac27a0ec 4177 return journal;
0b8e58a1 4178
ac27a0ec 4179out_journal:
dab291af 4180 jbd2_journal_destroy(journal);
ac27a0ec 4181out_bdev:
617ba13b 4182 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4183 return NULL;
4184}
4185
617ba13b
MC		 4186static int ext4_load_journal(struct super_block *sb,
4187 struct ext4_super_block *es,
ac27a0ec
DK		 4188 unsigned long journal_devnum)
4189{
4190 journal_t *journal;
4191 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4192 dev_t journal_dev;
4193 int err = 0;
4194 int really_read_only;
4195
0390131b
FM		 4196 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4197
ac27a0ec
DK		 4198 if (journal_devnum &&
4199 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4200 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4201 "numbers have changed");
ac27a0ec
DK		 4202 journal_dev = new_decode_dev(journal_devnum);
4203 } else
4204 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4205
4206 really_read_only = bdev_read_only(sb->s_bdev);
4207
4208 /*
4209 * Are we loading a blank journal or performing recovery after a
4210 * crash? For recovery, we need to check in advance whether we
4211 * can get read-write access to the device.
4212 */
617ba13b 4213 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4214 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4215 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4216 "required on readonly filesystem");
ac27a0ec 4217 if (really_read_only) {
b31e1552
ES		 4218 ext4_msg(sb, KERN_ERR, "write access "
4219 "unavailable, cannot proceed");
ac27a0ec
DK		 4220 return -EROFS;
4221 }
b31e1552
ES		 4222 ext4_msg(sb, KERN_INFO, "write access will "
4223 "be enabled during recovery");
ac27a0ec
DK		 4224 }
4225 }
4226
4227 if (journal_inum && journal_dev) {
b31e1552
ES		 4228 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4229 "and inode journals!");
ac27a0ec
DK		 4230 return -EINVAL;
4231 }
4232
4233 if (journal_inum) {
617ba13b 4234 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4235 return -EINVAL;
4236 } else {
617ba13b 4237 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4238 return -EINVAL;
4239 }
4240
90576c0b 4241 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4242 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4243
617ba13b 4244 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4245 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4246 if (!err) {
4247 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4248 if (save)
4249 memcpy(save, ((char *) es) +
4250 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4251 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4252 if (save)
4253 memcpy(((char *) es) + EXT4_S_ERR_START,
4254 save, EXT4_S_ERR_LEN);
4255 kfree(save);
4256 }
ac27a0ec
DK		 4257
4258 if (err) {
b31e1552 4259 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4260 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4261 return err;
4262 }
4263
617ba13b
MC		 4264 EXT4_SB(sb)->s_journal = journal;
4265 ext4_clear_journal_err(sb, es);
ac27a0ec 4266
c41303ce 4267 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4268 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4269 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4270
4271 /* Make sure we flush the recovery flag to disk. */
e2d67052 4272 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4273 }
4274
4275 return 0;
4276}
4277
e2d67052 4278static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4279{
e2d67052 4280 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4281 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4282 int error = 0;
ac27a0ec 4283
7c2e7087 4284 if (!sbh || block_device_ejected(sb))
c4be0c1d 4285 return error;
914258bf
TT		 4286 if (buffer_write_io_error(sbh)) {
4287 /*
4288 * Oh, dear. A previous attempt to write the
4289 * superblock failed. This could happen because the
4290 * USB device was yanked out. Or it could happen to
4291 * be a transient write error and maybe the block will
4292 * be remapped. Nothing we can do but to retry the
4293 * write and hope for the best.
4294 */
b31e1552
ES		 4295 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4296 "superblock detected");
914258bf
TT		 4297 clear_buffer_write_io_error(sbh);
4298 set_buffer_uptodate(sbh);
4299 }
71290b36
TT		 4300 /*
4301 * If the file system is mounted read-only, don't update the
4302 * superblock write time. This avoids updating the superblock
4303 * write time when we are mounting the root file system
4304 * read/only but we need to replay the journal; at that point,
4305 * for people who are east of GMT and who make their clock
4306 * tick in localtime for Windows bug-for-bug compatibility,
4307 * the clock is set in the future, and this will cause e2fsck
4308 * to complain and force a full file system check.
4309 */
4310 if (!(sb->s_flags & MS_RDONLY))
4311 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4312 if (sb->s_bdev->bd_part)
4313 es->s_kbytes_written =
4314 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4315 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4316 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4317 else
4318 es->s_kbytes_written =
4319 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4320 ext4_free_blocks_count_set(es,
4321 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4322 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4323 es->s_free_inodes_count =
4324 cpu_to_le32(percpu_counter_sum_positive(
4325 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4326 sb->s_dirt = 0;
ac27a0ec 4327 BUFFER_TRACE(sbh, "marking dirty");
a9c47317 4328 ext4_superblock_csum_set(sb, es);
ac27a0ec 4329 mark_buffer_dirty(sbh);
914258bf 4330 if (sync) {
c4be0c1d
TS		 4331 error = sync_dirty_buffer(sbh);
4332 if (error)
4333 return error;
4334
4335 error = buffer_write_io_error(sbh);
4336 if (error) {
b31e1552
ES		 4337 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4338 "superblock");
914258bf
TT		 4339 clear_buffer_write_io_error(sbh);
4340 set_buffer_uptodate(sbh);
4341 }
4342 }
c4be0c1d 4343 return error;
ac27a0ec
DK		 4344}
4345
ac27a0ec
DK		 4346/*
4347 * Have we just finished recovery? If so, and if we are mounting (or
4348 * remounting) the filesystem readonly, then we will end up with a
4349 * consistent fs on disk. Record that fact.
4350 */
2b2d6d01
TT		 4351static void ext4_mark_recovery_complete(struct super_block *sb,
4352 struct ext4_super_block *es)
ac27a0ec 4353{
617ba13b 4354 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4355
0390131b
FM		 4356 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4357 BUG_ON(journal != NULL);
4358 return;
4359 }
dab291af 4360 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4361 if (jbd2_journal_flush(journal) < 0)
4362 goto out;
4363
617ba13b 4364 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4365 sb->s_flags & MS_RDONLY) {
617ba13b 4366 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4367 ext4_commit_super(sb, 1);
ac27a0ec 4368 }
7ffe1ea8
HK		 4369
4370out:
dab291af 4371 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4372}
4373
4374/*
4375 * If we are mounting (or read-write remounting) a filesystem whose journal
4376 * has recorded an error from a previous lifetime, move that error to the
4377 * main filesystem now.
4378 */
2b2d6d01
TT		 4379static void ext4_clear_journal_err(struct super_block *sb,
4380 struct ext4_super_block *es)
ac27a0ec
DK		 4381{
4382 journal_t *journal;
4383 int j_errno;
4384 const char *errstr;
4385
0390131b
FM		 4386 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4387
617ba13b 4388 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4389
4390 /*
4391 * Now check for any error status which may have been recorded in the
617ba13b 4392 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4393 */
4394
dab291af 4395 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4396 if (j_errno) {
4397 char nbuf[16];
4398
617ba13b 4399 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4400 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4401 "from previous mount: %s", errstr);
12062ddd 4402 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4403
617ba13b
MC		 4404 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4405 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4406 ext4_commit_super(sb, 1);
ac27a0ec 4407
dab291af 4408 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4409 }
4410}
4411
4412/*
4413 * Force the running and committing transactions to commit,
4414 * and wait on the commit.
4415 */
617ba13b 4416int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4417{
4418 journal_t *journal;
0390131b 4419 int ret = 0;
ac27a0ec
DK		 4420
4421 if (sb->s_flags & MS_RDONLY)
4422 return 0;
4423
617ba13b 4424 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4425 if (journal) {
437f88cc 4426 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4427 ret = ext4_journal_force_commit(journal);
6b0310fb 4428 }
0390131b 4429
ac27a0ec
DK		 4430 return ret;
4431}
4432
2b2d6d01 4433static void ext4_write_super(struct super_block *sb)
ac27a0ec 4434{
ebc1ac16 4435 lock_super(sb);
9ca92389 4436 ext4_commit_super(sb, 1);
ebc1ac16 4437 unlock_super(sb);
ac27a0ec
DK		 4438}
4439
617ba13b 4440static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4441{
14ce0cb4 4442 int ret = 0;
9eddacf9 4443 tid_t target;
8d5d02e6 4444 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4445
9bffad1e 4446 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4447 flush_workqueue(sbi->dio_unwritten_wq);
4448 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4449 if (wait)
8d5d02e6 4450 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4451 }
14ce0cb4 4452 return ret;
ac27a0ec
DK		 4453}
4454
4455/*
4456 * LVM calls this function before a (read-only) snapshot is created. This
4457 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4458 *
4459 * Note that only this function cannot bring a filesystem to be in a clean
4460 * state independently, because ext4 prevents a new handle from being started
4461 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4462 * the upper layer.
ac27a0ec 4463 */
c4be0c1d 4464static int ext4_freeze(struct super_block *sb)
ac27a0ec 4465{
c4be0c1d
TS		 4466 int error = 0;
4467 journal_t *journal;
ac27a0ec 4468
9ca92389
TT		 4469 if (sb->s_flags & MS_RDONLY)
4470 return 0;
ac27a0ec 4471
9ca92389 4472 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4473
9ca92389
TT		 4474 /* Now we set up the journal barrier. */
4475 jbd2_journal_lock_updates(journal);
ac27a0ec 4476
9ca92389
TT		 4477 /*
4478 * Don't clear the needs_recovery flag if we failed to flush
4479 * the journal.
4480 */
4481 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4482 if (error < 0)
4483 goto out;
9ca92389
TT		 4484
4485 /* Journal blocked and flushed, clear needs_recovery flag. */
4486 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4487 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4488out:
4489 /* we rely on s_frozen to stop further updates */
4490 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4491 return error;
ac27a0ec
DK		 4492}
4493
4494/*
4495 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4496 * flag here, even though the filesystem is not technically dirty yet.
4497 */
c4be0c1d 4498static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4499{
9ca92389
TT		 4500 if (sb->s_flags & MS_RDONLY)
4501 return 0;
4502
4503 lock_super(sb);
4504 /* Reset the needs_recovery flag before the fs is unlocked. */
4505 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4506 ext4_commit_super(sb, 1);
4507 unlock_super(sb);
c4be0c1d 4508 return 0;
ac27a0ec
DK		 4509}
4510
673c6100
TT		 4511/*
4512 * Structure to save mount options for ext4_remount's benefit
4513 */
4514struct ext4_mount_options {
4515 unsigned long s_mount_opt;
a2595b8a 4516 unsigned long s_mount_opt2;
08cefc7a
EB		 4517 kuid_t s_resuid;
4518 kgid_t s_resgid;
673c6100
TT		 4519 unsigned long s_commit_interval;
4520 u32 s_min_batch_time, s_max_batch_time;
4521#ifdef CONFIG_QUOTA
4522 int s_jquota_fmt;
4523 char *s_qf_names[MAXQUOTAS];
4524#endif
4525};
4526
2b2d6d01 4527static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4528{
2b2d6d01 4529 struct ext4_super_block *es;
617ba13b 4530 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4531 unsigned long old_sb_flags;
617ba13b 4532 struct ext4_mount_options old_opts;
c79d967d 4533 int enable_quota = 0;
8a266467 4534 ext4_group_t g;
b3881f74 4535 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4536 int err = 0;
ac27a0ec
DK		 4537#ifdef CONFIG_QUOTA
4538 int i;
4539#endif
d4c402d9 4540 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4541
4542 /* Store the original options */
bbd6851a 4543 lock_super(sb);
ac27a0ec
DK		 4544 old_sb_flags = sb->s_flags;
4545 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4546 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4547 old_opts.s_resuid = sbi->s_resuid;
4548 old_opts.s_resgid = sbi->s_resgid;
4549 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4550 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4551 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4552#ifdef CONFIG_QUOTA
4553 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4554 for (i = 0; i < MAXQUOTAS; i++)
4555 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4556#endif
b3881f74
TT		 4557 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4558 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4559
4560 /*
4561 * Allow the "check" option to be passed as a remount option.
4562 */
661aa520 4563 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4564 err = -EINVAL;
4565 goto restore_opts;
4566 }
4567
4ab2f15b 4568 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4569 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4570
4571 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4572 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4573
4574 es = sbi->s_es;
4575
b3881f74 4576 if (sbi->s_journal) {
0390131b 4577 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4578 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4579 }
ac27a0ec 4580
661aa520 4581 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4582 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4583 err = -EROFS;
4584 goto restore_opts;
4585 }
4586
4587 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4588 err = dquot_suspend(sb, -1);
4589 if (err < 0)
c79d967d 4590 goto restore_opts;
c79d967d 4591
ac27a0ec
DK		 4592 /*
4593 * First of all, the unconditional stuff we have to do
4594 * to disable replay of the journal when we next remount
4595 */
4596 sb->s_flags |= MS_RDONLY;
4597
4598 /*
4599 * OK, test if we are remounting a valid rw partition
4600 * readonly, and if so set the rdonly flag and then
4601 * mark the partition as valid again.
4602 */
617ba13b
MC		 4603 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4604 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4605 es->s_state = cpu_to_le16(sbi->s_mount_state);
4606
a63c9eb2 4607 if (sbi->s_journal)
0390131b 4608 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4609 } else {
a13fb1a4
ES		 4610 /* Make sure we can mount this feature set readwrite */
4611 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4612 err = -EROFS;
4613 goto restore_opts;
4614 }
8a266467
TT		 4615 /*
4616 * Make sure the group descriptor checksums
0b8e58a1 4617 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4618 */
4619 for (g = 0; g < sbi->s_groups_count; g++) {
4620 struct ext4_group_desc *gdp =
4621 ext4_get_group_desc(sb, g, NULL);
4622
feb0ab32 4623 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4624 ext4_msg(sb, KERN_ERR,
4625 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4626 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4627 le16_to_cpu(gdp->bg_checksum));
4628 err = -EINVAL;
4629 goto restore_opts;
4630 }
4631 }
4632
ead6596b
ES		 4633 /*
4634 * If we have an unprocessed orphan list hanging
4635 * around from a previously readonly bdev mount,
4636 * require a full umount/remount for now.
4637 */
4638 if (es->s_last_orphan) {
b31e1552 4639 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4640 "remount RDWR because of unprocessed "
4641 "orphan inode list. Please "
b31e1552 4642 "umount/remount instead");
ead6596b
ES		 4643 err = -EINVAL;
4644 goto restore_opts;
4645 }
4646
ac27a0ec
DK		 4647 /*
4648 * Mounting a RDONLY partition read-write, so reread
4649 * and store the current valid flag. (It may have
4650 * been changed by e2fsck since we originally mounted
4651 * the partition.)
4652 */
0390131b
FM		 4653 if (sbi->s_journal)
4654 ext4_clear_journal_err(sb, es);
ac27a0ec 4655 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4656 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4657 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4658 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4659 EXT4_FEATURE_INCOMPAT_MMP))
4660 if (ext4_multi_mount_protect(sb,
4661 le64_to_cpu(es->s_mmp_block))) {
4662 err = -EROFS;
4663 goto restore_opts;
4664 }
c79d967d 4665 enable_quota = 1;
ac27a0ec
DK		 4666 }
4667 }
bfff6873
LC		 4668
4669 /*
4670 * Reinitialize lazy itable initialization thread based on
4671 * current settings
4672 */
4673 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4674 ext4_unregister_li_request(sb);
4675 else {
4676 ext4_group_t first_not_zeroed;
4677 first_not_zeroed = ext4_has_uninit_itable(sb);
4678 ext4_register_li_request(sb, first_not_zeroed);
4679 }
4680
6fd058f7 4681 ext4_setup_system_zone(sb);
0390131b 4682 if (sbi->s_journal == NULL)
e2d67052 4683 ext4_commit_super(sb, 1);
0390131b 4684
ac27a0ec
DK		 4685#ifdef CONFIG_QUOTA
4686 /* Release old quota file names */
4687 for (i = 0; i < MAXQUOTAS; i++)
4688 if (old_opts.s_qf_names[i] &&
4689 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4690 kfree(old_opts.s_qf_names[i]);
4691#endif
bbd6851a 4692 unlock_super(sb);
c79d967d 4693 if (enable_quota)
0f0dd62f 4694 dquot_resume(sb, -1);
d4c402d9
CW		 4695
4696 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4697 kfree(orig_data);
ac27a0ec 4698 return 0;
0b8e58a1 4699
ac27a0ec
DK		 4700restore_opts:
4701 sb->s_flags = old_sb_flags;
4702 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4703 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4704 sbi->s_resuid = old_opts.s_resuid;
4705 sbi->s_resgid = old_opts.s_resgid;
4706 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4707 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4708 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4709#ifdef CONFIG_QUOTA
4710 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4711 for (i = 0; i < MAXQUOTAS; i++) {
4712 if (sbi->s_qf_names[i] &&
4713 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4714 kfree(sbi->s_qf_names[i]);
4715 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4716 }
4717#endif
bbd6851a 4718 unlock_super(sb);
d4c402d9 4719 kfree(orig_data);
ac27a0ec
DK		 4720 return err;
4721}
4722
2b2d6d01 4723static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4724{
4725 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4726 struct ext4_sb_info *sbi = EXT4_SB(sb);
4727 struct ext4_super_block *es = sbi->s_es;
952fc18e 4728 ext4_fsblk_t overhead = 0;
960cc398 4729 u64 fsid;
d02a9391 4730 s64 bfree;
ac27a0ec 4731
952fc18e
TT		 4732 if (!test_opt(sb, MINIX_DF))
4733 overhead = sbi->s_overhead;
ac27a0ec 4734
617ba13b 4735 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4736 buf->f_bsize = sb->s_blocksize;
952fc18e 4737 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
57042651
TT		 4738 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4739 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4740 /* prevent underflow in case that few free space is available */
57042651 4741 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4742 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4743 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4744 buf->f_bavail = 0;
4745 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4746 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4747 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4748 fsid = le64_to_cpup((void *)es->s_uuid) ^
4749 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4750 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4751 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4752
ac27a0ec
DK		 4753 return 0;
4754}
4755
0b8e58a1
AD		 4756/* Helper function for writing quotas on sync - we need to start transaction
4757 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4758 * Process 1 Process 2
617ba13b 4759 * ext4_create() quota_sync()
a269eb18 4760 * jbd2_journal_start() write_dquot()
871a2931 4761 * dquot_initialize() down(dqio_mutex)
dab291af 4762 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4763 *
4764 */
4765
4766#ifdef CONFIG_QUOTA
4767
4768static inline struct inode *dquot_to_inode(struct dquot *dquot)
4769{
4770 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4771}
4772
617ba13b 4773static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4774{
4775 int ret, err;
4776 handle_t *handle;
4777 struct inode *inode;
4778
4779 inode = dquot_to_inode(dquot);
617ba13b 4780 handle = ext4_journal_start(inode,
0b8e58a1 4781 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4782 if (IS_ERR(handle))
4783 return PTR_ERR(handle);
4784 ret = dquot_commit(dquot);
617ba13b 4785 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4786 if (!ret)
4787 ret = err;
4788 return ret;
4789}
4790
617ba13b 4791static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4792{
4793 int ret, err;
4794 handle_t *handle;
4795
617ba13b 4796 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4797 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4798 if (IS_ERR(handle))
4799 return PTR_ERR(handle);
4800 ret = dquot_acquire(dquot);
617ba13b 4801 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4802 if (!ret)
4803 ret = err;
4804 return ret;
4805}
4806
617ba13b 4807static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4808{
4809 int ret, err;
4810 handle_t *handle;
4811
617ba13b 4812 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4813 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4814 if (IS_ERR(handle)) {
4815 /* Release dquot anyway to avoid endless cycle in dqput() */
4816 dquot_release(dquot);
ac27a0ec 4817 return PTR_ERR(handle);
9c3013e9 4818 }
ac27a0ec 4819 ret = dquot_release(dquot);
617ba13b 4820 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4821 if (!ret)
4822 ret = err;
4823 return ret;
4824}
4825
617ba13b 4826static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4827{
2c8be6b2 4828 /* Are we journaling quotas? */
617ba13b
MC		 4829 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4830 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4831 dquot_mark_dquot_dirty(dquot);
617ba13b 4832 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4833 } else {
4834 return dquot_mark_dquot_dirty(dquot);
4835 }
4836}
4837
617ba13b 4838static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4839{
4840 int ret, err;
4841 handle_t *handle;
4842
4843 /* Data block + inode block */
617ba13b 4844 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4845 if (IS_ERR(handle))
4846 return PTR_ERR(handle);
4847 ret = dquot_commit_info(sb, type);
617ba13b 4848 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4849 if (!ret)
4850 ret = err;
4851 return ret;
4852}
4853
4854/*
4855 * Turn on quotas during mount time - we need to find
4856 * the quota file and such...
4857 */
617ba13b 4858static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4859{
287a8095
CH		 4860 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4861 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4862}
4863
4864/*
4865 * Standard function to be called on quota_on
4866 */
617ba13b 4867static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4868 struct path *path)
ac27a0ec
DK		 4869{
4870 int err;
ac27a0ec
DK		 4871
4872 if (!test_opt(sb, QUOTA))
4873 return -EINVAL;
0623543b 4874
ac27a0ec 4875 /* Quotafile not on the same filesystem? */
d8c9584e 4876 if (path->dentry->d_sb != sb)
ac27a0ec 4877 return -EXDEV;
0623543b
JK		 4878 /* Journaling quota? */
4879 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4880 /* Quotafile not in fs root? */
f00c9e44 4881 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4882 ext4_msg(sb, KERN_WARNING,
4883 "Quota file not on filesystem root. "
4884 "Journaled quota will not work");
2b2d6d01 4885 }
0623543b
JK		 4886
4887 /*
4888 * When we journal data on quota file, we have to flush journal to see
4889 * all updates to the file when we bypass pagecache...
4890 */
0390131b 4891 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4892 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4893 /*
4894 * We don't need to lock updates but journal_flush() could
4895 * otherwise be livelocked...
4896 */
4897 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4898 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4899 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4900 if (err)
7ffe1ea8 4901 return err;
0623543b
JK		 4902 }
4903
f00c9e44 4904 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4905}
4906
ca0e05e4
DM		 4907static int ext4_quota_off(struct super_block *sb, int type)
4908{
21f97697
JK		 4909 struct inode *inode = sb_dqopt(sb)->files[type];
4910 handle_t *handle;
4911
87009d86
DM		 4912 /* Force all delayed allocation blocks to be allocated.
4913 * Caller already holds s_umount sem */
4914 if (test_opt(sb, DELALLOC))
ca0e05e4 4915 sync_filesystem(sb);
ca0e05e4 4916
0b268590
AG		 4917 if (!inode)
4918 goto out;
4919
21f97697
JK		 4920 /* Update modification times of quota files when userspace can
4921 * start looking at them */
4922 handle = ext4_journal_start(inode, 1);
4923 if (IS_ERR(handle))
4924 goto out;
4925 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4926 ext4_mark_inode_dirty(handle, inode);
4927 ext4_journal_stop(handle);
4928
4929out:
ca0e05e4
DM		 4930 return dquot_quota_off(sb, type);
4931}
4932
ac27a0ec
DK		 4933/* Read data from quotafile - avoid pagecache and such because we cannot afford
4934 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4935 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4936 * we don't have to be afraid of races */
617ba13b 4937static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4938 size_t len, loff_t off)
4939{
4940 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4941 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4942 int err = 0;
4943 int offset = off & (sb->s_blocksize - 1);
4944 int tocopy;
4945 size_t toread;
4946 struct buffer_head *bh;
4947 loff_t i_size = i_size_read(inode);
4948
4949 if (off > i_size)
4950 return 0;
4951 if (off+len > i_size)
4952 len = i_size-off;
4953 toread = len;
4954 while (toread > 0) {
4955 tocopy = sb->s_blocksize - offset < toread ?
4956 sb->s_blocksize - offset : toread;
617ba13b 4957 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4958 if (err)
4959 return err;
4960 if (!bh) /* A hole? */
4961 memset(data, 0, tocopy);
4962 else
4963 memcpy(data, bh->b_data+offset, tocopy);
4964 brelse(bh);
4965 offset = 0;
4966 toread -= tocopy;
4967 data += tocopy;
4968 blk++;
4969 }
4970 return len;
4971}
4972
4973/* Write to quotafile (we know the transaction is already started and has
4974 * enough credits) */
617ba13b 4975static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4976 const char *data, size_t len, loff_t off)
4977{
4978 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4979 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4980 int err = 0;
4981 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4982 struct buffer_head *bh;
4983 handle_t *handle = journal_current_handle();
4984
0390131b 4985 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4986 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4987 " cancelled because transaction is not started",
9c3013e9
JK		 4988 (unsigned long long)off, (unsigned long long)len);
4989 return -EIO;
4990 }
67eeb568
DM		 4991 /*
4992 * Since we account only one data block in transaction credits,
4993 * then it is impossible to cross a block boundary.
4994 */
4995 if (sb->s_blocksize - offset < len) {
4996 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4997 " cancelled because not block aligned",
4998 (unsigned long long)off, (unsigned long long)len);
4999 return -EIO;
5000 }
5001
67eeb568
DM		 5002 bh = ext4_bread(handle, inode, blk, 1, &err);
5003 if (!bh)
5004 goto out;
62d2b5f2
JK		 5005 err = ext4_journal_get_write_access(handle, bh);
5006 if (err) {
5007 brelse(bh);
5008 goto out;
ac27a0ec 5009 }
67eeb568
DM		 5010 lock_buffer(bh);
5011 memcpy(bh->b_data+offset, data, len);
5012 flush_dcache_page(bh->b_page);
5013 unlock_buffer(bh);
62d2b5f2 5014 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5015 brelse(bh);
ac27a0ec 5016out:
0b7f7cef 5017 if (err)
ac27a0ec 5018 return err;
67eeb568
DM		 5019 if (inode->i_size < off + len) {
5020 i_size_write(inode, off + len);
617ba13b 5021 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5022 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5023 }
67eeb568 5024 return len;
ac27a0ec
DK		 5025}
5026
5027#endif
5028
152a0836
AV		 5029static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5030 const char *dev_name, void *data)
ac27a0ec 5031{
152a0836 5032 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5033}
5034
37f328eb 5035#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5036static inline void register_as_ext2(void)
5037{
5038 int err = register_filesystem(&ext2_fs_type);
5039 if (err)
5040 printk(KERN_WARNING
5041 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5042}
5043
5044static inline void unregister_as_ext2(void)
5045{
5046 unregister_filesystem(&ext2_fs_type);
5047}
2035e776
TT		 5048
5049static inline int ext2_feature_set_ok(struct super_block *sb)
5050{
5051 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5052 return 0;
5053 if (sb->s_flags & MS_RDONLY)
5054 return 1;
5055 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5056 return 0;
5057 return 1;
5058}
51b7e3c9 5059MODULE_ALIAS("ext2");
24b58424
TT		 5060#else
5061static inline void register_as_ext2(void) { }
5062static inline void unregister_as_ext2(void) { }
2035e776 5063static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5064#endif
5065
37f328eb 5066#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5067static inline void register_as_ext3(void)
5068{
5069 int err = register_filesystem(&ext3_fs_type);
5070 if (err)
5071 printk(KERN_WARNING
5072 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5073}
5074
5075static inline void unregister_as_ext3(void)
5076{
5077 unregister_filesystem(&ext3_fs_type);
5078}
2035e776
TT		 5079
5080static inline int ext3_feature_set_ok(struct super_block *sb)
5081{
5082 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5083 return 0;
5084 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5085 return 0;
5086 if (sb->s_flags & MS_RDONLY)
5087 return 1;
5088 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5089 return 0;
5090 return 1;
5091}
51b7e3c9 5092MODULE_ALIAS("ext3");
24b58424
TT		 5093#else
5094static inline void register_as_ext3(void) { }
5095static inline void unregister_as_ext3(void) { }
2035e776 5096static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5097#endif
5098
03010a33
TT		 5099static struct file_system_type ext4_fs_type = {
5100 .owner = THIS_MODULE,
5101 .name = "ext4",
152a0836 5102 .mount = ext4_mount,
03010a33
TT		 5103 .kill_sb = kill_block_super,
5104 .fs_flags = FS_REQUIRES_DEV,
5105};
5106
8f021222 5107static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5108{
5109 struct ext4_features *ef;
5110 int ret = -ENOMEM;
5111
5112 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5113 if (!ef)
5114 goto out;
5115
5116 ef->f_kobj.kset = ext4_kset;
5117 init_completion(&ef->f_kobj_unregister);
5118 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5119 "features");
5120 if (ret) {
5121 kfree(ef);
5122 goto out;
5123 }
5124
5125 ext4_feat = ef;
5126 ret = 0;
5127out:
5128 return ret;
5129}
5130
8f021222
LC		 5131static void ext4_exit_feat_adverts(void)
5132{
5133 kobject_put(&ext4_feat->f_kobj);
5134 wait_for_completion(&ext4_feat->f_kobj_unregister);
5135 kfree(ext4_feat);
5136}
5137
e9e3bcec
ES		 5138/* Shared across all ext4 file systems */
5139wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5140struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5141
5dabfc78 5142static int __init ext4_init_fs(void)
ac27a0ec 5143{
e9e3bcec 5144 int i, err;
c9de560d 5145
07c0c5d8
AV		 5146 ext4_li_info = NULL;
5147 mutex_init(&ext4_li_mtx);
5148
12e9b892 5149 ext4_check_flag_values();
e9e3bcec
ES		 5150
5151 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5152 mutex_init(&ext4__aio_mutex[i]);
5153 init_waitqueue_head(&ext4__ioend_wq[i]);
5154 }
5155
5dabfc78 5156 err = ext4_init_pageio();
6fd058f7
TT		 5157 if (err)
5158 return err;
5dabfc78 5159 err = ext4_init_system_zone();
bd2d0210 5160 if (err)
d44651d0 5161 goto out6;
3197ebdb
TT		 5162 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5163 if (!ext4_kset)
dd68314c 5164 goto out5;
d44651d0 5165 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5166
5167 err = ext4_init_feat_adverts();
dd68314c
TT		 5168 if (err)
5169 goto out4;
857ac889 5170
5dabfc78 5171 err = ext4_init_mballoc();
ac27a0ec 5172 if (err)
6fd058f7 5173 goto out3;
c9de560d 5174
5dabfc78 5175 err = ext4_init_xattr();
c9de560d
AT		 5176 if (err)
5177 goto out2;
ac27a0ec
DK		 5178 err = init_inodecache();
5179 if (err)
5180 goto out1;
24b58424 5181 register_as_ext3();
2035e776 5182 register_as_ext2();
03010a33 5183 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5184 if (err)
5185 goto out;
bfff6873 5186
ac27a0ec
DK		 5187 return 0;
5188out:
24b58424
TT		 5189 unregister_as_ext2();
5190 unregister_as_ext3();
ac27a0ec
DK		 5191 destroy_inodecache();
5192out1:
5dabfc78 5193 ext4_exit_xattr();
c9de560d 5194out2:
5dabfc78 5195 ext4_exit_mballoc();
6fd058f7 5196out3:
8f021222 5197 ext4_exit_feat_adverts();
dd68314c 5198out4:
d44651d0
FJ		 5199 if (ext4_proc_root)
5200 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5201 kset_unregister(ext4_kset);
d44651d0 5202out5:
5dabfc78 5203 ext4_exit_system_zone();
d44651d0 5204out6:
5dabfc78 5205 ext4_exit_pageio();
ac27a0ec
DK		 5206 return err;
5207}
5208
5dabfc78 5209static void __exit ext4_exit_fs(void)
ac27a0ec 5210{
bfff6873 5211 ext4_destroy_lazyinit_thread();
24b58424
TT		 5212 unregister_as_ext2();
5213 unregister_as_ext3();
03010a33 5214 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5215 destroy_inodecache();
5dabfc78
TT		 5216 ext4_exit_xattr();
5217 ext4_exit_mballoc();
8f021222 5218 ext4_exit_feat_adverts();
9f6200bb 5219 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5220 kset_unregister(ext4_kset);
5dabfc78
TT		 5221 ext4_exit_system_zone();
5222 ext4_exit_pageio();
ac27a0ec
DK		 5223}
5224
5225MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5226MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5227MODULE_LICENSE("GPL");
5dabfc78
TT		 5228module_init(ext4_init_fs)
5229module_exit(ext4_exit_fs)
Empty description
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