projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ext4: simplify handling of the errors=* mount options
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
e2d67052 65static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 66static void ext4_mark_recovery_complete(struct super_block *sb,
67 struct ext4_super_block *es);
68static void ext4_clear_journal_err(struct super_block *sb,
69 struct ext4_super_block *es);
617ba13b 70static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 71static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 72 char nbuf[16]);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 76static void ext4_write_super(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
109#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110#else
111#define IS_EXT3_SB(sb) (0)
112#endif
bd81d8ee 113
9933fc0a
TT		 114void *ext4_kvmalloc(size_t size, gfp_t flags)
115{
116 void *ret;
117
118 ret = kmalloc(size, flags);
119 if (!ret)
120 ret = __vmalloc(size, flags, PAGE_KERNEL);
121 return ret;
122}
123
124void *ext4_kvzalloc(size_t size, gfp_t flags)
125{
126 void *ret;
127
db9481c0 128 ret = kzalloc(size, flags);
9933fc0a
TT		 129 if (!ret)
130 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
131 return ret;
132}
133
134void ext4_kvfree(void *ptr)
135{
136 if (is_vmalloc_addr(ptr))
137 vfree(ptr);
138 else
139 kfree(ptr);
140
141}
142
8fadc143
AR		 143ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
144 struct ext4_group_desc *bg)
bd81d8ee 145{
3a14589c 146 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 147 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 148 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 149}
150
8fadc143
AR		 151ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
152 struct ext4_group_desc *bg)
bd81d8ee 153{
5272f837 154 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 155 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 156 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 157}
158
8fadc143
AR		 159ext4_fsblk_t ext4_inode_table(struct super_block *sb,
160 struct ext4_group_desc *bg)
bd81d8ee 161{
5272f837 162 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 163 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 164 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 165}
166
021b65bb
TT		 167__u32 ext4_free_group_clusters(struct super_block *sb,
168 struct ext4_group_desc *bg)
560671a0
AK		 169{
170 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
171 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 172 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 173}
174
175__u32 ext4_free_inodes_count(struct super_block *sb,
176 struct ext4_group_desc *bg)
177{
178 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
179 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 180 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 181}
182
183__u32 ext4_used_dirs_count(struct super_block *sb,
184 struct ext4_group_desc *bg)
185{
186 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
187 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 188 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 189}
190
191__u32 ext4_itable_unused_count(struct super_block *sb,
192 struct ext4_group_desc *bg)
193{
194 return le16_to_cpu(bg->bg_itable_unused_lo) |
195 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 196 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 197}
198
8fadc143
AR		 199void ext4_block_bitmap_set(struct super_block *sb,
200 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 201{
3a14589c 202 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 203 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
204 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 205}
206
8fadc143
AR		 207void ext4_inode_bitmap_set(struct super_block *sb,
208 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 209{
5272f837 210 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 211 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
212 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 213}
214
8fadc143
AR		 215void ext4_inode_table_set(struct super_block *sb,
216 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 217{
5272f837 218 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 219 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
220 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 221}
222
021b65bb
TT		 223void ext4_free_group_clusters_set(struct super_block *sb,
224 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 225{
226 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
227 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
228 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
229}
230
231void ext4_free_inodes_set(struct super_block *sb,
232 struct ext4_group_desc *bg, __u32 count)
233{
234 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
235 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
236 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
237}
238
239void ext4_used_dirs_set(struct super_block *sb,
240 struct ext4_group_desc *bg, __u32 count)
241{
242 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
243 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
244 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
245}
246
247void ext4_itable_unused_set(struct super_block *sb,
248 struct ext4_group_desc *bg, __u32 count)
249{
250 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
251 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
252 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
253}
254
d3d1faf6
CW		 255
256/* Just increment the non-pointer handle value */
257static handle_t *ext4_get_nojournal(void)
258{
259 handle_t *handle = current->journal_info;
260 unsigned long ref_cnt = (unsigned long)handle;
261
262 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
263
264 ref_cnt++;
265 handle = (handle_t *)ref_cnt;
266
267 current->journal_info = handle;
268 return handle;
269}
270
271
272/* Decrement the non-pointer handle value */
273static void ext4_put_nojournal(handle_t *handle)
274{
275 unsigned long ref_cnt = (unsigned long)handle;
276
277 BUG_ON(ref_cnt == 0);
278
279 ref_cnt--;
280 handle = (handle_t *)ref_cnt;
281
282 current->journal_info = handle;
283}
284
ac27a0ec 285/*
dab291af 286 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 287 *
288 * The only special thing we need to do here is to make sure that all
289 * journal_end calls result in the superblock being marked dirty, so
290 * that sync() will call the filesystem's write_super callback if
291 * appropriate.
be4f27d3
YY		 292 *
293 * To avoid j_barrier hold in userspace when a user calls freeze(),
294 * ext4 prevents a new handle from being started by s_frozen, which
295 * is in an upper layer.
ac27a0ec 296 */
617ba13b 297handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 298{
299 journal_t *journal;
be4f27d3 300 handle_t *handle;
ac27a0ec 301
12706394 302 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 303 if (sb->s_flags & MS_RDONLY)
304 return ERR_PTR(-EROFS);
305
617ba13b 306 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 307 handle = ext4_journal_current_handle();
308
309 /*
310 * If a handle has been started, it should be allowed to
311 * finish, otherwise deadlock could happen between freeze
312 * and others(e.g. truncate) due to the restart of the
313 * journal handle if the filesystem is forzen and active
314 * handles are not stopped.
315 */
316 if (!handle)
317 vfs_check_frozen(sb, SB_FREEZE_TRANS);
318
319 if (!journal)
320 return ext4_get_nojournal();
321 /*
322 * Special case here: if the journal has aborted behind our
323 * backs (eg. EIO in the commit thread), then we still need to
324 * take the FS itself readonly cleanly.
325 */
326 if (is_journal_aborted(journal)) {
327 ext4_abort(sb, "Detected aborted journal");
328 return ERR_PTR(-EROFS);
ac27a0ec 329 }
be4f27d3 330 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 331}
332
333/*
334 * The only special thing we need to do here is to make sure that all
dab291af 335 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 336 * that sync() will call the filesystem's write_super callback if
337 * appropriate.
338 */
c398eda0 339int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 340{
341 struct super_block *sb;
342 int err;
343 int rc;
344
0390131b 345 if (!ext4_handle_valid(handle)) {
d3d1faf6 346 ext4_put_nojournal(handle);
0390131b
FM		 347 return 0;
348 }
ac27a0ec
DK		 349 sb = handle->h_transaction->t_journal->j_private;
350 err = handle->h_err;
dab291af 351 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 352
353 if (!err)
354 err = rc;
355 if (err)
c398eda0 356 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 357 return err;
358}
359
90c7201b
TT		 360void ext4_journal_abort_handle(const char *caller, unsigned int line,
361 const char *err_fn, struct buffer_head *bh,
362 handle_t *handle, int err)
ac27a0ec
DK		 363{
364 char nbuf[16];
617ba13b 365 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 366
0390131b
FM		 367 BUG_ON(!ext4_handle_valid(handle));
368
ac27a0ec
DK		 369 if (bh)
370 BUFFER_TRACE(bh, "abort");
371
372 if (!handle->h_err)
373 handle->h_err = err;
374
375 if (is_handle_aborted(handle))
376 return;
377
90c7201b
TT		 378 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
379 caller, line, errstr, err_fn);
ac27a0ec 380
dab291af 381 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 382}
383
1c13d5c0
TT		 384static void __save_error_info(struct super_block *sb, const char *func,
385 unsigned int line)
386{
387 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
388
389 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
390 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
391 es->s_last_error_time = cpu_to_le32(get_seconds());
392 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
393 es->s_last_error_line = cpu_to_le32(line);
394 if (!es->s_first_error_time) {
395 es->s_first_error_time = es->s_last_error_time;
396 strncpy(es->s_first_error_func, func,
397 sizeof(es->s_first_error_func));
398 es->s_first_error_line = cpu_to_le32(line);
399 es->s_first_error_ino = es->s_last_error_ino;
400 es->s_first_error_block = es->s_last_error_block;
401 }
66e61a9e
TT		 402 /*
403 * Start the daily error reporting function if it hasn't been
404 * started already
405 */
406 if (!es->s_error_count)
407 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 408 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
409}
410
411static void save_error_info(struct super_block *sb, const char *func,
412 unsigned int line)
413{
414 __save_error_info(sb, func, line);
415 ext4_commit_super(sb, 1);
416}
417
7c2e7087
TT		 418/*
419 * The del_gendisk() function uninitializes the disk-specific data
420 * structures, including the bdi structure, without telling anyone
421 * else. Once this happens, any attempt to call mark_buffer_dirty()
422 * (for example, by ext4_commit_super), will cause a kernel OOPS.
423 * This is a kludge to prevent these oops until we can put in a proper
424 * hook in del_gendisk() to inform the VFS and file system layers.
425 */
426static int block_device_ejected(struct super_block *sb)
427{
428 struct inode *bd_inode = sb->s_bdev->bd_inode;
429 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
430
431 return bdi->dev == NULL;
432}
433
18aadd47
BJ		 434static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
435{
436 struct super_block *sb = journal->j_private;
437 struct ext4_sb_info *sbi = EXT4_SB(sb);
438 int error = is_journal_aborted(journal);
439 struct ext4_journal_cb_entry *jce, *tmp;
440
441 spin_lock(&sbi->s_md_lock);
442 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
443 list_del_init(&jce->jce_list);
444 spin_unlock(&sbi->s_md_lock);
445 jce->jce_func(sb, jce, error);
446 spin_lock(&sbi->s_md_lock);
447 }
448 spin_unlock(&sbi->s_md_lock);
449}
1c13d5c0 450
ac27a0ec
DK		 451/* Deal with the reporting of failure conditions on a filesystem such as
452 * inconsistencies detected or read IO failures.
453 *
454 * On ext2, we can store the error state of the filesystem in the
617ba13b 455 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 456 * write ordering constraints on the superblock which prevent us from
457 * writing it out straight away; and given that the journal is about to
458 * be aborted, we can't rely on the current, or future, transactions to
459 * write out the superblock safely.
460 *
dab291af 461 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 462 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 463 * that error until we've noted it down and cleared it.
464 */
465
617ba13b 466static void ext4_handle_error(struct super_block *sb)
ac27a0ec 467{
ac27a0ec
DK		 468 if (sb->s_flags & MS_RDONLY)
469 return;
470
2b2d6d01 471 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 472 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 473
4ab2f15b 474 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 475 if (journal)
dab291af 476 jbd2_journal_abort(journal, -EIO);
ac27a0ec 477 }
2b2d6d01 478 if (test_opt(sb, ERRORS_RO)) {
b31e1552 479 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 480 sb->s_flags |= MS_RDONLY;
481 }
ac27a0ec 482 if (test_opt(sb, ERRORS_PANIC))
617ba13b 483 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 484 sb->s_id);
485}
486
12062ddd 487void __ext4_error(struct super_block *sb, const char *function,
c398eda0 488 unsigned int line, const char *fmt, ...)
ac27a0ec 489{
0ff2ea7d 490 struct va_format vaf;
ac27a0ec
DK		 491 va_list args;
492
493 va_start(args, fmt);
0ff2ea7d
JP		 494 vaf.fmt = fmt;
495 vaf.va = &args;
496 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
497 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 498 va_end(args);
499
617ba13b 500 ext4_handle_error(sb);
ac27a0ec
DK		 501}
502
c398eda0
TT		 503void ext4_error_inode(struct inode *inode, const char *function,
504 unsigned int line, ext4_fsblk_t block,
273df556
FM		 505 const char *fmt, ...)
506{
507 va_list args;
f7c21177 508 struct va_format vaf;
1c13d5c0 509 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 510
1c13d5c0
TT		 511 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
512 es->s_last_error_block = cpu_to_le64(block);
513 save_error_info(inode->i_sb, function, line);
273df556 514 va_start(args, fmt);
f7c21177
TT		 515 vaf.fmt = fmt;
516 vaf.va = &args;
c398eda0
TT		 517 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
518 inode->i_sb->s_id, function, line, inode->i_ino);
519 if (block)
f7c21177
TT		 520 printk(KERN_CONT "block %llu: ", block);
521 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
273df556
FM		 522 va_end(args);
523
524 ext4_handle_error(inode->i_sb);
525}
526
c398eda0 527void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 528 unsigned int line, ext4_fsblk_t block,
529 const char *fmt, ...)
273df556
FM		 530{
531 va_list args;
f7c21177 532 struct va_format vaf;
1c13d5c0 533 struct ext4_super_block *es;
273df556
FM		 534 struct inode *inode = file->f_dentry->d_inode;
535 char pathname[80], *path;
536
1c13d5c0
TT		 537 es = EXT4_SB(inode->i_sb)->s_es;
538 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
539 save_error_info(inode->i_sb, function, line);
273df556 540 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 541 if (IS_ERR(path))
273df556
FM		 542 path = "(unknown)";
543 printk(KERN_CRIT
f7c21177
TT		 544 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
545 inode->i_sb->s_id, function, line, inode->i_ino);
546 if (block)
547 printk(KERN_CONT "block %llu: ", block);
548 va_start(args, fmt);
549 vaf.fmt = fmt;
550 vaf.va = &args;
551 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
273df556
FM		 552 va_end(args);
553
554 ext4_handle_error(inode->i_sb);
555}
556
2b2d6d01 557static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 558 char nbuf[16])
559{
560 char *errstr = NULL;
561
562 switch (errno) {
563 case -EIO:
564 errstr = "IO failure";
565 break;
566 case -ENOMEM:
567 errstr = "Out of memory";
568 break;
569 case -EROFS:
78f1ddbb
TT		 570 if (!sb || (EXT4_SB(sb)->s_journal &&
571 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 572 errstr = "Journal has aborted";
573 else
574 errstr = "Readonly filesystem";
575 break;
576 default:
577 /* If the caller passed in an extra buffer for unknown
578 * errors, textualise them now. Else we just return
579 * NULL. */
580 if (nbuf) {
581 /* Check for truncated error codes... */
582 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
583 errstr = nbuf;
584 }
585 break;
586 }
587
588 return errstr;
589}
590
617ba13b 591/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 592 * automatically and invokes the appropriate error response. */
593
c398eda0
TT		 594void __ext4_std_error(struct super_block *sb, const char *function,
595 unsigned int line, int errno)
ac27a0ec
DK		 596{
597 char nbuf[16];
598 const char *errstr;
599
600 /* Special case: if the error is EROFS, and we're not already
601 * inside a transaction, then there's really no point in logging
602 * an error. */
603 if (errno == -EROFS && journal_current_handle() == NULL &&
604 (sb->s_flags & MS_RDONLY))
605 return;
606
617ba13b 607 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 608 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
609 sb->s_id, function, line, errstr);
1c13d5c0 610 save_error_info(sb, function, line);
ac27a0ec 611
617ba13b 612 ext4_handle_error(sb);
ac27a0ec
DK		 613}
614
615/*
617ba13b 616 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 617 * abort function may be used to deal with unrecoverable failures such
618 * as journal IO errors or ENOMEM at a critical moment in log management.
619 *
620 * We unconditionally force the filesystem into an ABORT|READONLY state,
621 * unless the error response on the fs has been set to panic in which
622 * case we take the easy way out and panic immediately.
623 */
624
c67d859e 625void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 626 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 627{
628 va_list args;
629
1c13d5c0 630 save_error_info(sb, function, line);
ac27a0ec 631 va_start(args, fmt);
c398eda0
TT		 632 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
633 function, line);
ac27a0ec
DK		 634 vprintk(fmt, args);
635 printk("\n");
636 va_end(args);
637
1c13d5c0
TT		 638 if ((sb->s_flags & MS_RDONLY) == 0) {
639 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
640 sb->s_flags |= MS_RDONLY;
641 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
642 if (EXT4_SB(sb)->s_journal)
643 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
644 save_error_info(sb, function, line);
645 }
ac27a0ec 646 if (test_opt(sb, ERRORS_PANIC))
617ba13b 647 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 648}
649
0ff2ea7d 650void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 651{
0ff2ea7d 652 struct va_format vaf;
b31e1552
ES		 653 va_list args;
654
655 va_start(args, fmt);
0ff2ea7d
JP		 656 vaf.fmt = fmt;
657 vaf.va = &args;
658 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 659 va_end(args);
660}
661
12062ddd 662void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 663 unsigned int line, const char *fmt, ...)
ac27a0ec 664{
0ff2ea7d 665 struct va_format vaf;
ac27a0ec
DK		 666 va_list args;
667
668 va_start(args, fmt);
0ff2ea7d
JP		 669 vaf.fmt = fmt;
670 vaf.va = &args;
671 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
672 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 673 va_end(args);
674}
675
e29136f8
TT		 676void __ext4_grp_locked_error(const char *function, unsigned int line,
677 struct super_block *sb, ext4_group_t grp,
678 unsigned long ino, ext4_fsblk_t block,
679 const char *fmt, ...)
5d1b1b3f
AK		 680__releases(bitlock)
681__acquires(bitlock)
682{
0ff2ea7d 683 struct va_format vaf;
5d1b1b3f
AK		 684 va_list args;
685 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
686
1c13d5c0
TT		 687 es->s_last_error_ino = cpu_to_le32(ino);
688 es->s_last_error_block = cpu_to_le64(block);
689 __save_error_info(sb, function, line);
0ff2ea7d 690
5d1b1b3f 691 va_start(args, fmt);
0ff2ea7d
JP		 692
693 vaf.fmt = fmt;
694 vaf.va = &args;
21149d61 695 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 696 sb->s_id, function, line, grp);
697 if (ino)
0ff2ea7d 698 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 699 if (block)
0ff2ea7d
JP		 700 printk(KERN_CONT "block %llu:", (unsigned long long) block);
701 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 702 va_end(args);
703
704 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 705 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 706 return;
707 }
1c13d5c0 708
5d1b1b3f
AK		 709 ext4_unlock_group(sb, grp);
710 ext4_handle_error(sb);
711 /*
712 * We only get here in the ERRORS_RO case; relocking the group
713 * may be dangerous, but nothing bad will happen since the
714 * filesystem will have already been marked read/only and the
715 * journal has been aborted. We return 1 as a hint to callers
716 * who might what to use the return value from
25985edc 717 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 718 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
719 * aggressively from the ext4 function in question, with a
720 * more appropriate error code.
721 */
722 ext4_lock_group(sb, grp);
723 return;
724}
725
617ba13b 726void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 727{
617ba13b 728 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 729
617ba13b 730 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 731 return;
732
12062ddd 733 ext4_warning(sb,
ac27a0ec
DK		 734 "updating to rev %d because of new feature flag, "
735 "running e2fsck is recommended",
617ba13b 736 EXT4_DYNAMIC_REV);
ac27a0ec 737
617ba13b
MC		 738 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
739 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
740 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 741 /* leave es->s_feature_*compat flags alone */
742 /* es->s_uuid will be set by e2fsck if empty */
743
744 /*
745 * The rest of the superblock fields should be zero, and if not it
746 * means they are likely already in use, so leave them alone. We
747 * can leave it up to e2fsck to clean up any inconsistencies there.
748 */
749}
750
751/*
752 * Open the external journal device
753 */
b31e1552 754static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 755{
756 struct block_device *bdev;
757 char b[BDEVNAME_SIZE];
758
d4d77629 759 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 760 if (IS_ERR(bdev))
761 goto fail;
762 return bdev;
763
764fail:
b31e1552 765 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 766 __bdevname(dev, b), PTR_ERR(bdev));
767 return NULL;
768}
769
770/*
771 * Release the journal device
772 */
617ba13b 773static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 774{
e525fd89 775 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 776}
777
617ba13b 778static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 779{
780 struct block_device *bdev;
781 int ret = -ENODEV;
782
783 bdev = sbi->journal_bdev;
784 if (bdev) {
617ba13b 785 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 786 sbi->journal_bdev = NULL;
787 }
788 return ret;
789}
790
791static inline struct inode *orphan_list_entry(struct list_head *l)
792{
617ba13b 793 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 794}
795
617ba13b 796static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 797{
798 struct list_head *l;
799
b31e1552
ES		 800 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
801 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 802
803 printk(KERN_ERR "sb_info orphan list:\n");
804 list_for_each(l, &sbi->s_orphan) {
805 struct inode *inode = orphan_list_entry(l);
806 printk(KERN_ERR " "
807 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
808 inode->i_sb->s_id, inode->i_ino, inode,
809 inode->i_mode, inode->i_nlink,
810 NEXT_ORPHAN(inode));
811 }
812}
813
2b2d6d01 814static void ext4_put_super(struct super_block *sb)
ac27a0ec 815{
617ba13b
MC		 816 struct ext4_sb_info *sbi = EXT4_SB(sb);
817 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 818 int i, err;
ac27a0ec 819
857ac889 820 ext4_unregister_li_request(sb);
e0ccfd95
CH		 821 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
822
4c0425ff
MC		 823 flush_workqueue(sbi->dio_unwritten_wq);
824 destroy_workqueue(sbi->dio_unwritten_wq);
825
a9e220f8 826 lock_super(sb);
8c85e125 827 if (sb->s_dirt)
ebc1ac16 828 ext4_commit_super(sb, 1);
8c85e125 829
0390131b
FM		 830 if (sbi->s_journal) {
831 err = jbd2_journal_destroy(sbi->s_journal);
832 sbi->s_journal = NULL;
833 if (err < 0)
c67d859e 834 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 835 }
d4edac31 836
a1c6c569 837 del_timer(&sbi->s_err_report);
d4edac31
JB		 838 ext4_release_system_zone(sb);
839 ext4_mb_release(sb);
840 ext4_ext_release(sb);
841 ext4_xattr_put_super(sb);
842
ac27a0ec 843 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 844 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 845 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 846 ext4_commit_super(sb, 1);
ac27a0ec 847 }
240799cd 848 if (sbi->s_proc) {
9f6200bb 849 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 850 }
3197ebdb 851 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 852
853 for (i = 0; i < sbi->s_gdb_count; i++)
854 brelse(sbi->s_group_desc[i]);
f18a5f21 855 ext4_kvfree(sbi->s_group_desc);
9933fc0a 856 ext4_kvfree(sbi->s_flex_groups);
57042651 857 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 858 percpu_counter_destroy(&sbi->s_freeinodes_counter);
859 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 860 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 861 brelse(sbi->s_sbh);
862#ifdef CONFIG_QUOTA
863 for (i = 0; i < MAXQUOTAS; i++)
864 kfree(sbi->s_qf_names[i]);
865#endif
866
867 /* Debugging code just in case the in-memory inode orphan list
868 * isn't empty. The on-disk one can be non-empty if we've
869 * detected an error and taken the fs readonly, but the
870 * in-memory list had better be clean by this point. */
871 if (!list_empty(&sbi->s_orphan))
872 dump_orphan_list(sb, sbi);
873 J_ASSERT(list_empty(&sbi->s_orphan));
874
f98393a6 875 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 876 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
877 /*
878 * Invalidate the journal device's buffers. We don't want them
879 * floating about in memory - the physical journal device may
880 * hotswapped, and it breaks the `ro-after' testing code.
881 */
882 sync_blockdev(sbi->journal_bdev);
f98393a6 883 invalidate_bdev(sbi->journal_bdev);
617ba13b 884 ext4_blkdev_remove(sbi);
ac27a0ec 885 }
c5e06d10
JL		 886 if (sbi->s_mmp_tsk)
887 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 888 sb->s_fs_info = NULL;
3197ebdb
TT		 889 /*
890 * Now that we are completely done shutting down the
891 * superblock, we need to actually destroy the kobject.
892 */
3197ebdb
TT		 893 unlock_super(sb);
894 kobject_put(&sbi->s_kobj);
895 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 896 kfree(sbi->s_blockgroup_lock);
ac27a0ec 897 kfree(sbi);
ac27a0ec
DK		 898}
899
e18b890b 900static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 901
902/*
903 * Called inside transaction, so use GFP_NOFS
904 */
617ba13b 905static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 906{
617ba13b 907 struct ext4_inode_info *ei;
ac27a0ec 908
e6b4f8da 909 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 910 if (!ei)
911 return NULL;
0b8e58a1 912
ac27a0ec 913 ei->vfs_inode.i_version = 1;
91246c00 914 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 915 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 916 INIT_LIST_HEAD(&ei->i_prealloc_list);
917 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 918 ei->i_reserved_data_blocks = 0;
919 ei->i_reserved_meta_blocks = 0;
920 ei->i_allocated_meta_blocks = 0;
9d0be502 921 ei->i_da_metadata_calc_len = 0;
d2a17637 922 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 923#ifdef CONFIG_QUOTA
924 ei->i_reserved_quota = 0;
925#endif
8aefcd55 926 ei->jinode = NULL;
c7064ef1 927 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 928 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 929 ei->cur_aio_dio = NULL;
b436b9be
JK		 930 ei->i_sync_tid = 0;
931 ei->i_datasync_tid = 0;
f7ad6d2e 932 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 933 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 934
ac27a0ec
DK		 935 return &ei->vfs_inode;
936}
937
7ff9c073
TT		 938static int ext4_drop_inode(struct inode *inode)
939{
940 int drop = generic_drop_inode(inode);
941
942 trace_ext4_drop_inode(inode, drop);
943 return drop;
944}
945
fa0d7e3d
NP		 946static void ext4_i_callback(struct rcu_head *head)
947{
948 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 949 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
950}
951
617ba13b 952static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 953{
9f7dd93d 954 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 955 ext4_msg(inode->i_sb, KERN_ERR,
956 "Inode %lu (%p): orphan list check failed!",
957 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 958 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
959 EXT4_I(inode), sizeof(struct ext4_inode_info),
960 true);
961 dump_stack();
962 }
fa0d7e3d 963 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 964}
965
51cc5068 966static void init_once(void *foo)
ac27a0ec 967{
617ba13b 968 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 969
a35afb83 970 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 971#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 972 init_rwsem(&ei->xattr_sem);
ac27a0ec 973#endif
0e855ac8 974 init_rwsem(&ei->i_data_sem);
a35afb83 975 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 976}
977
978static int init_inodecache(void)
979{
617ba13b
MC		 980 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
981 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 982 0, (SLAB_RECLAIM_ACCOUNT|
983 SLAB_MEM_SPREAD),
20c2df83 984 init_once);
617ba13b 985 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 986 return -ENOMEM;
987 return 0;
988}
989
990static void destroy_inodecache(void)
991{
617ba13b 992 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 993}
994
0930fcc1 995void ext4_clear_inode(struct inode *inode)
ac27a0ec 996{
0930fcc1
AV		 997 invalidate_inode_buffers(inode);
998 end_writeback(inode);
9f754758 999 dquot_drop(inode);
c2ea3fde 1000 ext4_discard_preallocations(inode);
8aefcd55
TT		 1001 if (EXT4_I(inode)->jinode) {
1002 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1003 EXT4_I(inode)->jinode);
1004 jbd2_free_inode(EXT4_I(inode)->jinode);
1005 EXT4_I(inode)->jinode = NULL;
1006 }
ac27a0ec
DK		 1007}
1008
2b2d6d01
TT		 1009static inline void ext4_show_quota_options(struct seq_file *seq,
1010 struct super_block *sb)
ac27a0ec
DK		 1011{
1012#if defined(CONFIG_QUOTA)
617ba13b 1013 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 1014
5a20bdfc
JK		 1015 if (sbi->s_jquota_fmt) {
1016 char *fmtname = "";
1017
1018 switch (sbi->s_jquota_fmt) {
1019 case QFMT_VFS_OLD:
1020 fmtname = "vfsold";
1021 break;
1022 case QFMT_VFS_V0:
1023 fmtname = "vfsv0";
1024 break;
1025 case QFMT_VFS_V1:
1026 fmtname = "vfsv1";
1027 break;
1028 }
1029 seq_printf(seq, ",jqfmt=%s", fmtname);
1030 }
ac27a0ec
DK		 1031
1032 if (sbi->s_qf_names[USRQUOTA])
1033 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1034
1035 if (sbi->s_qf_names[GRPQUOTA])
1036 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1037
482a7425 1038 if (test_opt(sb, USRQUOTA))
ac27a0ec
DK		 1039 seq_puts(seq, ",usrquota");
1040
482a7425 1041 if (test_opt(sb, GRPQUOTA))
ac27a0ec
DK		 1042 seq_puts(seq, ",grpquota");
1043#endif
1044}
1045
d9c9bef1
MS		 1046/*
1047 * Show an option if
1048 * - it's set to a non-default value OR
1049 * - if the per-sb default is different from the global default
1050 */
34c80b1d 1051static int ext4_show_options(struct seq_file *seq, struct dentry *root)
ac27a0ec 1052{
aa22df2c
AK		 1053 int def_errors;
1054 unsigned long def_mount_opts;
34c80b1d 1055 struct super_block *sb = root->d_sb;
d9c9bef1
MS		 1056 struct ext4_sb_info *sbi = EXT4_SB(sb);
1057 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 1058
1059 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 1060 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 1061
1062 if (sbi->s_sb_block != 1)
1063 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1064 if (test_opt(sb, MINIX_DF))
1065 seq_puts(seq, ",minixdf");
aa22df2c 1066 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 1067 seq_puts(seq, ",grpid");
1068 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1069 seq_puts(seq, ",nogrpid");
1070 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1071 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1072 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1073 }
1074 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1075 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1076 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1077 }
bb4f397a 1078 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 1079 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 1080 def_errors == EXT4_ERRORS_CONTINUE) {
1081 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 1082 }
1083 }
aa22df2c 1084 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 1085 seq_puts(seq, ",errors=continue");
aa22df2c 1086 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 1087 seq_puts(seq, ",errors=panic");
aa22df2c 1088 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 1089 seq_puts(seq, ",nouid32");
aa22df2c 1090 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1 1091 seq_puts(seq, ",debug");
03010a33 1092#ifdef CONFIG_EXT4_FS_XATTR
ea663336 1093 if (test_opt(sb, XATTR_USER))
d9c9bef1 1094 seq_puts(seq, ",user_xattr");
ea663336 1095 if (!test_opt(sb, XATTR_USER))
d9c9bef1 1096 seq_puts(seq, ",nouser_xattr");
d9c9bef1 1097#endif
03010a33 1098#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 1099 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 1100 seq_puts(seq, ",acl");
1101 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1102 seq_puts(seq, ",noacl");
1103#endif
30773840 1104 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 1105 seq_printf(seq, ",commit=%u",
1106 (unsigned) (sbi->s_commit_interval / HZ));
1107 }
30773840
TT		 1108 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1109 seq_printf(seq, ",min_batch_time=%u",
1110 (unsigned) sbi->s_min_batch_time);
1111 }
1112 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1113 seq_printf(seq, ",max_batch_time=%u",
1d526fc9 1114 (unsigned) sbi->s_max_batch_time);
30773840
TT		 1115 }
1116
571640ca
ES		 1117 /*
1118 * We're changing the default of barrier mount option, so
1119 * let's always display its mount state so it's clear what its
1120 * status is.
1121 */
1122 seq_puts(seq, ",barrier=");
1123 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 1124 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1125 seq_puts(seq, ",journal_async_commit");
39a4bade
JK		 1126 else if (test_opt(sb, JOURNAL_CHECKSUM))
1127 seq_puts(seq, ",journal_checksum");
c64db50e 1128 if (sb->s_flags & MS_I_VERSION)
25ec56b5 1129 seq_puts(seq, ",i_version");
8b67f04a
TT		 1130 if (!test_opt(sb, DELALLOC) &&
1131 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
dd919b98
AK		 1132 seq_puts(seq, ",nodelalloc");
1133
6fd7a467
TT		 1134 if (!test_opt(sb, MBLK_IO_SUBMIT))
1135 seq_puts(seq, ",nomblk_io_submit");
cb45bbe4
MS		 1136 if (sbi->s_stripe)
1137 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 1138 /*
1139 * journal mode get enabled in different ways
1140 * So just print the value even if we didn't specify it
1141 */
617ba13b 1142 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 1143 seq_puts(seq, ",data=journal");
617ba13b 1144 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 1145 seq_puts(seq, ",data=ordered");
617ba13b 1146 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 1147 seq_puts(seq, ",data=writeback");
1148
240799cd
TT		 1149 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1150 seq_printf(seq, ",inode_readahead_blks=%u",
1151 sbi->s_inode_readahead_blks);
1152
5bf5683a
HK		 1153 if (test_opt(sb, DATA_ERR_ABORT))
1154 seq_puts(seq, ",data_err=abort");
1155
afd4672d 1156 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 1157 seq_puts(seq, ",noauto_da_alloc");
afd4672d 1158
8b67f04a 1159 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
5328e635
ES		 1160 seq_puts(seq, ",discard");
1161
e3bb52ae
ES		 1162 if (test_opt(sb, NOLOAD))
1163 seq_puts(seq, ",norecovery");
1164
744692dc
JZ		 1165 if (test_opt(sb, DIOREAD_NOLOCK))
1166 seq_puts(seq, ",dioread_nolock");
1167
8b67f04a
TT		 1168 if (test_opt(sb, BLOCK_VALIDITY) &&
1169 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1170 seq_puts(seq, ",block_validity");
1171
bfff6873 1172 if (!test_opt(sb, INIT_INODE_TABLE))
fc6cb1cd 1173 seq_puts(seq, ",noinit_itable");
51ce6511 1174 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
fc6cb1cd 1175 seq_printf(seq, ",init_itable=%u",
bfff6873
LC		 1176 (unsigned) sbi->s_li_wait_mult);
1177
617ba13b 1178 ext4_show_quota_options(seq, sb);
0b8e58a1 1179
ac27a0ec
DK		 1180 return 0;
1181}
1182
1b961ac0 1183static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1184 u64 ino, u32 generation)
ac27a0ec 1185{
ac27a0ec 1186 struct inode *inode;
ac27a0ec 1187
617ba13b 1188 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1189 return ERR_PTR(-ESTALE);
617ba13b 1190 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1191 return ERR_PTR(-ESTALE);
1192
1193 /* iget isn't really right if the inode is currently unallocated!!
1194 *
617ba13b 1195 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1196 * deleted, so we should be safe.
1197 *
1198 * Currently we don't know the generation for parent directory, so
1199 * a generation of 0 means "accept any"
1200 */
1d1fe1ee
DH		 1201 inode = ext4_iget(sb, ino);
1202 if (IS_ERR(inode))
1203 return ERR_CAST(inode);
1204 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1205 iput(inode);
1206 return ERR_PTR(-ESTALE);
1207 }
1b961ac0
CH		 1208
1209 return inode;
1210}
1211
1212static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1213 int fh_len, int fh_type)
1b961ac0
CH		 1214{
1215 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1216 ext4_nfs_get_inode);
1217}
1218
1219static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1220 int fh_len, int fh_type)
1b961ac0
CH		 1221{
1222 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1223 ext4_nfs_get_inode);
ac27a0ec
DK		 1224}
1225
c39a7f84
TO		 1226/*
1227 * Try to release metadata pages (indirect blocks, directories) which are
1228 * mapped via the block device. Since these pages could have journal heads
1229 * which would prevent try_to_free_buffers() from freeing them, we must use
1230 * jbd2 layer's try_to_free_buffers() function to release them.
1231 */
0b8e58a1
AD		 1232static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1233 gfp_t wait)
c39a7f84
TO		 1234{
1235 journal_t *journal = EXT4_SB(sb)->s_journal;
1236
1237 WARN_ON(PageChecked(page));
1238 if (!page_has_buffers(page))
1239 return 0;
1240 if (journal)
1241 return jbd2_journal_try_to_free_buffers(journal, page,
1242 wait & ~__GFP_WAIT);
1243 return try_to_free_buffers(page);
1244}
1245
ac27a0ec 1246#ifdef CONFIG_QUOTA
af5bc92d 1247#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1248#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1249
617ba13b
MC		 1250static int ext4_write_dquot(struct dquot *dquot);
1251static int ext4_acquire_dquot(struct dquot *dquot);
1252static int ext4_release_dquot(struct dquot *dquot);
1253static int ext4_mark_dquot_dirty(struct dquot *dquot);
1254static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1255static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1256 struct path *path);
ca0e05e4 1257static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1258static int ext4_quota_on_mount(struct super_block *sb, int type);
1259static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1260 size_t len, loff_t off);
617ba13b 1261static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1262 const char *data, size_t len, loff_t off);
1263
61e225dc 1264static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1265 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1266 .write_dquot = ext4_write_dquot,
1267 .acquire_dquot = ext4_acquire_dquot,
1268 .release_dquot = ext4_release_dquot,
1269 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1270 .write_info = ext4_write_info,
1271 .alloc_dquot = dquot_alloc,
1272 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1273};
1274
0d54b217 1275static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1276 .quota_on = ext4_quota_on,
ca0e05e4 1277 .quota_off = ext4_quota_off,
287a8095
CH		 1278 .quota_sync = dquot_quota_sync,
1279 .get_info = dquot_get_dqinfo,
1280 .set_info = dquot_set_dqinfo,
1281 .get_dqblk = dquot_get_dqblk,
1282 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1283};
1284#endif
1285
ee9b6d61 1286static const struct super_operations ext4_sops = {
617ba13b
MC		 1287 .alloc_inode = ext4_alloc_inode,
1288 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1289 .write_inode = ext4_write_inode,
1290 .dirty_inode = ext4_dirty_inode,
7ff9c073 1291 .drop_inode = ext4_drop_inode,
0930fcc1 1292 .evict_inode = ext4_evict_inode,
617ba13b 1293 .put_super = ext4_put_super,
617ba13b 1294 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1295 .freeze_fs = ext4_freeze,
1296 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1297 .statfs = ext4_statfs,
1298 .remount_fs = ext4_remount,
617ba13b 1299 .show_options = ext4_show_options,
ac27a0ec 1300#ifdef CONFIG_QUOTA
617ba13b
MC		 1301 .quota_read = ext4_quota_read,
1302 .quota_write = ext4_quota_write,
ac27a0ec 1303#endif
c39a7f84 1304 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1305};
1306
9ca92389
TT		 1307static const struct super_operations ext4_nojournal_sops = {
1308 .alloc_inode = ext4_alloc_inode,
1309 .destroy_inode = ext4_destroy_inode,
1310 .write_inode = ext4_write_inode,
1311 .dirty_inode = ext4_dirty_inode,
7ff9c073 1312 .drop_inode = ext4_drop_inode,
0930fcc1 1313 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1314 .write_super = ext4_write_super,
1315 .put_super = ext4_put_super,
1316 .statfs = ext4_statfs,
1317 .remount_fs = ext4_remount,
9ca92389
TT		 1318 .show_options = ext4_show_options,
1319#ifdef CONFIG_QUOTA
1320 .quota_read = ext4_quota_read,
1321 .quota_write = ext4_quota_write,
1322#endif
1323 .bdev_try_to_free_page = bdev_try_to_free_page,
1324};
1325
39655164 1326static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1327 .fh_to_dentry = ext4_fh_to_dentry,
1328 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1329 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1330};
1331
1332enum {
1333 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1334 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1335 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1336 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1337 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1338 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1339 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1340 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1341 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1342 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1343 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1344 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1345 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1346 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1347 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1348 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1349 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1350 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1351};
1352
a447c093 1353static const match_table_t tokens = {
ac27a0ec
DK		 1354 {Opt_bsd_df, "bsddf"},
1355 {Opt_minix_df, "minixdf"},
1356 {Opt_grpid, "grpid"},
1357 {Opt_grpid, "bsdgroups"},
1358 {Opt_nogrpid, "nogrpid"},
1359 {Opt_nogrpid, "sysvgroups"},
1360 {Opt_resgid, "resgid=%u"},
1361 {Opt_resuid, "resuid=%u"},
1362 {Opt_sb, "sb=%u"},
1363 {Opt_err_cont, "errors=continue"},
1364 {Opt_err_panic, "errors=panic"},
1365 {Opt_err_ro, "errors=remount-ro"},
1366 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1367 {Opt_debug, "debug"},
1368 {Opt_oldalloc, "oldalloc"},
1369 {Opt_orlov, "orlov"},
1370 {Opt_user_xattr, "user_xattr"},
1371 {Opt_nouser_xattr, "nouser_xattr"},
1372 {Opt_acl, "acl"},
1373 {Opt_noacl, "noacl"},
ac27a0ec 1374 {Opt_noload, "noload"},
e3bb52ae 1375 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1376 {Opt_nobh, "nobh"},
1377 {Opt_bh, "bh"},
1378 {Opt_commit, "commit=%u"},
30773840
TT		 1379 {Opt_min_batch_time, "min_batch_time=%u"},
1380 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1381 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1382 {Opt_journal_checksum, "journal_checksum"},
1383 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1384 {Opt_abort, "abort"},
1385 {Opt_data_journal, "data=journal"},
1386 {Opt_data_ordered, "data=ordered"},
1387 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1388 {Opt_data_err_abort, "data_err=abort"},
1389 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1390 {Opt_offusrjquota, "usrjquota="},
1391 {Opt_usrjquota, "usrjquota=%s"},
1392 {Opt_offgrpjquota, "grpjquota="},
1393 {Opt_grpjquota, "grpjquota=%s"},
1394 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1395 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1396 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1397 {Opt_grpquota, "grpquota"},
1398 {Opt_noquota, "noquota"},
1399 {Opt_quota, "quota"},
1400 {Opt_usrquota, "usrquota"},
1401 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1402 {Opt_barrier, "barrier"},
1403 {Opt_nobarrier, "nobarrier"},
25ec56b5 1404 {Opt_i_version, "i_version"},
c9de560d 1405 {Opt_stripe, "stripe=%u"},
64769240 1406 {Opt_delalloc, "delalloc"},
dd919b98 1407 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1408 {Opt_mblk_io_submit, "mblk_io_submit"},
1409 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1410 {Opt_block_validity, "block_validity"},
1411 {Opt_noblock_validity, "noblock_validity"},
240799cd 1412 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1413 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1414 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1415 {Opt_auto_da_alloc, "auto_da_alloc"},
1416 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1417 {Opt_dioread_nolock, "dioread_nolock"},
1418 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1419 {Opt_discard, "discard"},
1420 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1421 {Opt_init_itable, "init_itable=%u"},
1422 {Opt_init_itable, "init_itable"},
1423 {Opt_noinit_itable, "noinit_itable"},
f3f12faa 1424 {Opt_err, NULL},
ac27a0ec
DK		 1425};
1426
617ba13b 1427static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1428{
617ba13b 1429 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1430 char *options = (char *) *data;
1431
1432 if (!options || strncmp(options, "sb=", 3) != 0)
1433 return 1; /* Default location */
0b8e58a1 1434
ac27a0ec 1435 options += 3;
0b8e58a1 1436 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1437 sb_block = simple_strtoul(options, &options, 0);
1438 if (*options && *options != ',') {
4776004f 1439 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1440 (char *) *data);
1441 return 1;
1442 }
1443 if (*options == ',')
1444 options++;
1445 *data = (void *) options;
0b8e58a1 1446
ac27a0ec
DK		 1447 return sb_block;
1448}
1449
b3881f74 1450#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1451static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1452 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1453
56c50f11
DM		 1454#ifdef CONFIG_QUOTA
1455static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1456{
1457 struct ext4_sb_info *sbi = EXT4_SB(sb);
1458 char *qname;
1459
1460 if (sb_any_quota_loaded(sb) &&
1461 !sbi->s_qf_names[qtype]) {
1462 ext4_msg(sb, KERN_ERR,
1463 "Cannot change journaled "
1464 "quota options when quota turned on");
1465 return 0;
1466 }
1467 qname = match_strdup(args);
1468 if (!qname) {
1469 ext4_msg(sb, KERN_ERR,
1470 "Not enough memory for storing quotafile name");
1471 return 0;
1472 }
1473 if (sbi->s_qf_names[qtype] &&
1474 strcmp(sbi->s_qf_names[qtype], qname)) {
1475 ext4_msg(sb, KERN_ERR,
1476 "%s quota file already specified", QTYPE2NAME(qtype));
1477 kfree(qname);
1478 return 0;
1479 }
1480 sbi->s_qf_names[qtype] = qname;
1481 if (strchr(sbi->s_qf_names[qtype], '/')) {
1482 ext4_msg(sb, KERN_ERR,
1483 "quotafile must be on filesystem root");
1484 kfree(sbi->s_qf_names[qtype]);
1485 sbi->s_qf_names[qtype] = NULL;
1486 return 0;
1487 }
fd8c37ec 1488 set_opt(sb, QUOTA);
56c50f11
DM		 1489 return 1;
1490}
1491
1492static int clear_qf_name(struct super_block *sb, int qtype)
1493{
1494
1495 struct ext4_sb_info *sbi = EXT4_SB(sb);
1496
1497 if (sb_any_quota_loaded(sb) &&
1498 sbi->s_qf_names[qtype]) {
1499 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1500 " when quota turned on");
1501 return 0;
1502 }
1503 /*
1504 * The space will be released later when all options are confirmed
1505 * to be correct
1506 */
1507 sbi->s_qf_names[qtype] = NULL;
1508 return 1;
1509}
1510#endif
1511
2b2d6d01 1512static int parse_options(char *options, struct super_block *sb,
c3191067 1513 unsigned long *journal_devnum,
b3881f74 1514 unsigned int *journal_ioprio,
661aa520 1515 int is_remount)
ac27a0ec 1516{
617ba13b 1517 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1518 char *p;
ac27a0ec
DK		 1519 substring_t args[MAX_OPT_ARGS];
1520 int data_opt = 0;
1521 int option;
1522#ifdef CONFIG_QUOTA
56c50f11 1523 int qfmt;
ac27a0ec
DK		 1524#endif
1525
1526 if (!options)
1527 return 1;
1528
2b2d6d01 1529 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1530 int token;
1531 if (!*p)
1532 continue;
1533
15121c18
ES		 1534 /*
1535 * Initialize args struct so we know whether arg was
1536 * found; some options take optional arguments.
1537 */
7dc57615 1538 args[0].to = args[0].from = NULL;
ac27a0ec
DK		 1539 token = match_token(p, tokens, args);
1540 switch (token) {
1541 case Opt_bsd_df:
fd8c37ec 1542 clear_opt(sb, MINIX_DF);
ac27a0ec
DK		 1543 break;
1544 case Opt_minix_df:
fd8c37ec 1545 set_opt(sb, MINIX_DF);
ac27a0ec
DK		 1546 break;
1547 case Opt_grpid:
fd8c37ec 1548 set_opt(sb, GRPID);
ac27a0ec
DK		 1549 break;
1550 case Opt_nogrpid:
fd8c37ec 1551 clear_opt(sb, GRPID);
ac27a0ec
DK		 1552 break;
1553 case Opt_resuid:
1554 if (match_int(&args[0], &option))
1555 return 0;
1556 sbi->s_resuid = option;
1557 break;
1558 case Opt_resgid:
1559 if (match_int(&args[0], &option))
1560 return 0;
1561 sbi->s_resgid = option;
1562 break;
1563 case Opt_sb:
1564 /* handled by get_sb_block() instead of here */
1565 /* *sb_block = match_int(&args[0]); */
1566 break;
1567 case Opt_err_panic:
39ef17f1 1568 clear_opt(sb, ERRORS_MASK);
fd8c37ec 1569 set_opt(sb, ERRORS_PANIC);
ac27a0ec
DK		 1570 break;
1571 case Opt_err_ro:
39ef17f1 1572 clear_opt(sb, ERRORS_MASK);
fd8c37ec 1573 set_opt(sb, ERRORS_RO);
ac27a0ec
DK		 1574 break;
1575 case Opt_err_cont:
39ef17f1 1576 clear_opt(sb, ERRORS_MASK);
fd8c37ec 1577 set_opt(sb, ERRORS_CONT);
ac27a0ec
DK		 1578 break;
1579 case Opt_nouid32:
fd8c37ec 1580 set_opt(sb, NO_UID32);
ac27a0ec 1581 break;
ac27a0ec 1582 case Opt_debug:
fd8c37ec 1583 set_opt(sb, DEBUG);
ac27a0ec
DK		 1584 break;
1585 case Opt_oldalloc:
4113c4ca
LC		 1586 ext4_msg(sb, KERN_WARNING,
1587 "Ignoring deprecated oldalloc option");
ac27a0ec
DK		 1588 break;
1589 case Opt_orlov:
4113c4ca
LC		 1590 ext4_msg(sb, KERN_WARNING,
1591 "Ignoring deprecated orlov option");
ac27a0ec 1592 break;
03010a33 1593#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1594 case Opt_user_xattr:
fd8c37ec 1595 set_opt(sb, XATTR_USER);
ac27a0ec
DK		 1596 break;
1597 case Opt_nouser_xattr:
fd8c37ec 1598 clear_opt(sb, XATTR_USER);
ac27a0ec
DK		 1599 break;
1600#else
1601 case Opt_user_xattr:
1602 case Opt_nouser_xattr:
b31e1552 1603 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1604 break;
1605#endif
03010a33 1606#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec 1607 case Opt_acl:
fd8c37ec 1608 set_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1609 break;
1610 case Opt_noacl:
fd8c37ec 1611 clear_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1612 break;
1613#else
1614 case Opt_acl:
1615 case Opt_noacl:
b31e1552 1616 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1617 break;
1618#endif
ac27a0ec
DK		 1619 case Opt_journal_dev:
1620 if (is_remount) {
b31e1552
ES		 1621 ext4_msg(sb, KERN_ERR,
1622 "Cannot specify journal on remount");
ac27a0ec
DK		 1623 return 0;
1624 }
1625 if (match_int(&args[0], &option))
1626 return 0;
1627 *journal_devnum = option;
1628 break;
818d276c 1629 case Opt_journal_checksum:
fd8c37ec 1630 set_opt(sb, JOURNAL_CHECKSUM);
d4da6c9c 1631 break;
818d276c 1632 case Opt_journal_async_commit:
fd8c37ec
TT		 1633 set_opt(sb, JOURNAL_ASYNC_COMMIT);
1634 set_opt(sb, JOURNAL_CHECKSUM);
818d276c 1635 break;
ac27a0ec 1636 case Opt_noload:
fd8c37ec 1637 set_opt(sb, NOLOAD);
ac27a0ec
DK		 1638 break;
1639 case Opt_commit:
1640 if (match_int(&args[0], &option))
1641 return 0;
1642 if (option < 0)
1643 return 0;
1644 if (option == 0)
cd02ff0b 1645 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1646 sbi->s_commit_interval = HZ * option;
1647 break;
30773840
TT		 1648 case Opt_max_batch_time:
1649 if (match_int(&args[0], &option))
1650 return 0;
1651 if (option < 0)
1652 return 0;
1653 if (option == 0)
1654 option = EXT4_DEF_MAX_BATCH_TIME;
1655 sbi->s_max_batch_time = option;
1656 break;
1657 case Opt_min_batch_time:
1658 if (match_int(&args[0], &option))
1659 return 0;
1660 if (option < 0)
1661 return 0;
1662 sbi->s_min_batch_time = option;
1663 break;
ac27a0ec 1664 case Opt_data_journal:
617ba13b 1665 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1666 goto datacheck;
1667 case Opt_data_ordered:
617ba13b 1668 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1669 goto datacheck;
1670 case Opt_data_writeback:
617ba13b 1671 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1672 datacheck:
1673 if (is_remount) {
eb513689
TT		 1674 if (!sbi->s_journal)
1675 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1676 else if (test_opt(sb, DATA_FLAGS) != data_opt) {
b31e1552
ES		 1677 ext4_msg(sb, KERN_ERR,
1678 "Cannot change data mode on remount");
ac27a0ec
DK		 1679 return 0;
1680 }
1681 } else {
fd8c37ec 1682 clear_opt(sb, DATA_FLAGS);
ac27a0ec
DK		 1683 sbi->s_mount_opt |= data_opt;
1684 }
1685 break;
5bf5683a 1686 case Opt_data_err_abort:
fd8c37ec 1687 set_opt(sb, DATA_ERR_ABORT);
5bf5683a
HK		 1688 break;
1689 case Opt_data_err_ignore:
fd8c37ec 1690 clear_opt(sb, DATA_ERR_ABORT);
5bf5683a 1691 break;
ac27a0ec
DK		 1692#ifdef CONFIG_QUOTA
1693 case Opt_usrjquota:
56c50f11 1694 if (!set_qf_name(sb, USRQUOTA, &args[0]))
ac27a0ec 1695 return 0;
56c50f11
DM		 1696 break;
1697 case Opt_grpjquota:
1698 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
ac27a0ec 1699 return 0;
ac27a0ec
DK		 1700 break;
1701 case Opt_offusrjquota:
56c50f11
DM		 1702 if (!clear_qf_name(sb, USRQUOTA))
1703 return 0;
1704 break;
ac27a0ec 1705 case Opt_offgrpjquota:
56c50f11 1706 if (!clear_qf_name(sb, GRPQUOTA))
ac27a0ec 1707 return 0;
ac27a0ec 1708 break;
56c50f11 1709
ac27a0ec 1710 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1711 qfmt = QFMT_VFS_OLD;
1712 goto set_qf_format;
ac27a0ec 1713 case Opt_jqfmt_vfsv0:
dfc5d03f 1714 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1715 goto set_qf_format;
1716 case Opt_jqfmt_vfsv1:
1717 qfmt = QFMT_VFS_V1;
dfc5d03f 1718set_qf_format:
17bd13b3 1719 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1720 sbi->s_jquota_fmt != qfmt) {
b31e1552 1721 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1722 "journaled quota options when "
b31e1552 1723 "quota turned on");
dfc5d03f
JK		 1724 return 0;
1725 }
1726 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1727 break;
1728 case Opt_quota:
1729 case Opt_usrquota:
fd8c37ec
TT		 1730 set_opt(sb, QUOTA);
1731 set_opt(sb, USRQUOTA);
ac27a0ec
DK		 1732 break;
1733 case Opt_grpquota:
fd8c37ec
TT		 1734 set_opt(sb, QUOTA);
1735 set_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1736 break;
1737 case Opt_noquota:
17bd13b3 1738 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1739 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1740 "options when quota turned on");
ac27a0ec
DK		 1741 return 0;
1742 }
fd8c37ec
TT		 1743 clear_opt(sb, QUOTA);
1744 clear_opt(sb, USRQUOTA);
1745 clear_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1746 break;
1747#else
1748 case Opt_quota:
1749 case Opt_usrquota:
1750 case Opt_grpquota:
b31e1552
ES		 1751 ext4_msg(sb, KERN_ERR,
1752 "quota options not supported");
cd59e7b9 1753 break;
ac27a0ec
DK		 1754 case Opt_usrjquota:
1755 case Opt_grpjquota:
1756 case Opt_offusrjquota:
1757 case Opt_offgrpjquota:
1758 case Opt_jqfmt_vfsold:
1759 case Opt_jqfmt_vfsv0:
5a20bdfc 1760 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1761 ext4_msg(sb, KERN_ERR,
1762 "journaled quota options not supported");
ac27a0ec
DK		 1763 break;
1764 case Opt_noquota:
1765 break;
1766#endif
1767 case Opt_abort:
4ab2f15b 1768 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1769 break;
06705bff 1770 case Opt_nobarrier:
fd8c37ec 1771 clear_opt(sb, BARRIER);
06705bff 1772 break;
ac27a0ec 1773 case Opt_barrier:
15121c18
ES		 1774 if (args[0].from) {
1775 if (match_int(&args[0], &option))
1776 return 0;
1777 } else
1778 option = 1; /* No argument, default to 1 */
ac27a0ec 1779 if (option)
fd8c37ec 1780 set_opt(sb, BARRIER);
ac27a0ec 1781 else
fd8c37ec 1782 clear_opt(sb, BARRIER);
ac27a0ec 1783 break;
ac27a0ec 1784 case Opt_nobh:
206f7ab4
CH		 1785 ext4_msg(sb, KERN_WARNING,
1786 "Ignoring deprecated nobh option");
ac27a0ec
DK		 1787 break;
1788 case Opt_bh:
206f7ab4
CH		 1789 ext4_msg(sb, KERN_WARNING,
1790 "Ignoring deprecated bh option");
ac27a0ec 1791 break;
25ec56b5 1792 case Opt_i_version:
25ec56b5
JNC		 1793 sb->s_flags |= MS_I_VERSION;
1794 break;
dd919b98 1795 case Opt_nodelalloc:
fd8c37ec 1796 clear_opt(sb, DELALLOC);
56889787 1797 clear_opt2(sb, EXPLICIT_DELALLOC);
dd919b98 1798 break;
1449032b 1799 case Opt_mblk_io_submit:
fd8c37ec 1800 set_opt(sb, MBLK_IO_SUBMIT);
1449032b
TT		 1801 break;
1802 case Opt_nomblk_io_submit:
fd8c37ec 1803 clear_opt(sb, MBLK_IO_SUBMIT);
1449032b 1804 break;
c9de560d
AT		 1805 case Opt_stripe:
1806 if (match_int(&args[0], &option))
1807 return 0;
1808 if (option < 0)
1809 return 0;
1810 sbi->s_stripe = option;
1811 break;
64769240 1812 case Opt_delalloc:
fd8c37ec 1813 set_opt(sb, DELALLOC);
56889787 1814 set_opt2(sb, EXPLICIT_DELALLOC);
64769240 1815 break;
6fd058f7 1816 case Opt_block_validity:
fd8c37ec 1817 set_opt(sb, BLOCK_VALIDITY);
6fd058f7
TT		 1818 break;
1819 case Opt_noblock_validity:
fd8c37ec 1820 clear_opt(sb, BLOCK_VALIDITY);
6fd058f7 1821 break;
240799cd
TT		 1822 case Opt_inode_readahead_blks:
1823 if (match_int(&args[0], &option))
1824 return 0;
1825 if (option < 0 || option > (1 << 30))
1826 return 0;
5dbd571d 1827 if (option && !is_power_of_2(option)) {
b31e1552
ES		 1828 ext4_msg(sb, KERN_ERR,
1829 "EXT4-fs: inode_readahead_blks"
1830 " must be a power of 2");
3197ebdb
TT		 1831 return 0;
1832 }
240799cd
TT		 1833 sbi->s_inode_readahead_blks = option;
1834 break;
b3881f74
TT		 1835 case Opt_journal_ioprio:
1836 if (match_int(&args[0], &option))
1837 return 0;
1838 if (option < 0 || option > 7)
1839 break;
1840 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1841 option);
1842 break;
06705bff 1843 case Opt_noauto_da_alloc:
fd8c37ec 1844 set_opt(sb, NO_AUTO_DA_ALLOC);
06705bff 1845 break;
afd4672d 1846 case Opt_auto_da_alloc:
15121c18
ES		 1847 if (args[0].from) {
1848 if (match_int(&args[0], &option))
1849 return 0;
1850 } else
1851 option = 1; /* No argument, default to 1 */
afd4672d 1852 if (option)
fd8c37ec 1853 clear_opt(sb, NO_AUTO_DA_ALLOC);
afd4672d 1854 else
fd8c37ec 1855 set_opt(sb,NO_AUTO_DA_ALLOC);
afd4672d 1856 break;
5328e635 1857 case Opt_discard:
fd8c37ec 1858 set_opt(sb, DISCARD);
5328e635
ES		 1859 break;
1860 case Opt_nodiscard:
fd8c37ec 1861 clear_opt(sb, DISCARD);
5328e635 1862 break;
744692dc 1863 case Opt_dioread_nolock:
fd8c37ec 1864 set_opt(sb, DIOREAD_NOLOCK);
744692dc
JZ		 1865 break;
1866 case Opt_dioread_lock:
fd8c37ec 1867 clear_opt(sb, DIOREAD_NOLOCK);
744692dc 1868 break;
fc6cb1cd 1869 case Opt_init_itable:
fd8c37ec 1870 set_opt(sb, INIT_INODE_TABLE);
bfff6873
LC		 1871 if (args[0].from) {
1872 if (match_int(&args[0], &option))
1873 return 0;
1874 } else
1875 option = EXT4_DEF_LI_WAIT_MULT;
1876 if (option < 0)
1877 return 0;
1878 sbi->s_li_wait_mult = option;
1879 break;
fc6cb1cd 1880 case Opt_noinit_itable:
fd8c37ec 1881 clear_opt(sb, INIT_INODE_TABLE);
bfff6873 1882 break;
ac27a0ec 1883 default:
b31e1552
ES		 1884 ext4_msg(sb, KERN_ERR,
1885 "Unrecognized mount option \"%s\" "
1886 "or missing value", p);
ac27a0ec
DK		 1887 return 0;
1888 }
1889 }
1890#ifdef CONFIG_QUOTA
1891 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1892 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1893 clear_opt(sb, USRQUOTA);
ac27a0ec 1894
482a7425 1895 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1896 clear_opt(sb, GRPQUOTA);
ac27a0ec 1897
56c50f11 1898 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1899 ext4_msg(sb, KERN_ERR, "old and new quota "
1900 "format mixing");
ac27a0ec
DK		 1901 return 0;
1902 }
1903
1904 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1905 ext4_msg(sb, KERN_ERR, "journaled quota format "
1906 "not specified");
ac27a0ec
DK		 1907 return 0;
1908 }
1909 } else {
1910 if (sbi->s_jquota_fmt) {
b31e1552 1911 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1912 "specified with no journaling "
b31e1552 1913 "enabled");
ac27a0ec
DK		 1914 return 0;
1915 }
1916 }
1917#endif
1918 return 1;
1919}
1920
617ba13b 1921static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1922 int read_only)
1923{
617ba13b 1924 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1925 int res = 0;
1926
617ba13b 1927 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1928 ext4_msg(sb, KERN_ERR, "revision level too high, "
1929 "forcing read-only mode");
ac27a0ec
DK		 1930 res = MS_RDONLY;
1931 }
1932 if (read_only)
281b5995 1933 goto done;
617ba13b 1934 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1935 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1936 "running e2fsck is recommended");
617ba13b 1937 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1938 ext4_msg(sb, KERN_WARNING,
1939 "warning: mounting fs with errors, "
1940 "running e2fsck is recommended");
ed3ce80a 1941 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1942 le16_to_cpu(es->s_mnt_count) >=
1943 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1944 ext4_msg(sb, KERN_WARNING,
1945 "warning: maximal mount count reached, "
1946 "running e2fsck is recommended");
ac27a0ec
DK		 1947 else if (le32_to_cpu(es->s_checkinterval) &&
1948 (le32_to_cpu(es->s_lastcheck) +
1949 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1950 ext4_msg(sb, KERN_WARNING,
1951 "warning: checktime reached, "
1952 "running e2fsck is recommended");
0b8e58a1 1953 if (!sbi->s_journal)
0390131b 1954 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1955 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1956 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1957 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1958 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1959 ext4_update_dynamic_rev(sb);
0390131b
FM		 1960 if (sbi->s_journal)
1961 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1962
e2d67052 1963 ext4_commit_super(sb, 1);
281b5995 1964done:
ac27a0ec 1965 if (test_opt(sb, DEBUG))
a9df9a49 1966 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1967 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1968 sb->s_blocksize,
1969 sbi->s_groups_count,
617ba13b
MC		 1970 EXT4_BLOCKS_PER_GROUP(sb),
1971 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1972 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1973
7abc52c2 1974 cleancache_init_fs(sb);
ac27a0ec
DK		 1975 return res;
1976}
1977
772cb7c8
JS		 1978static int ext4_fill_flex_info(struct super_block *sb)
1979{
1980 struct ext4_sb_info *sbi = EXT4_SB(sb);
1981 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1982 ext4_group_t flex_group_count;
1983 ext4_group_t flex_group;
d50f2ab6 1984 unsigned int groups_per_flex = 0;
c5ca7c76 1985 size_t size;
772cb7c8
JS		 1986 int i;
1987
503358ae 1988 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1989 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1990 sbi->s_log_groups_per_flex = 0;
1991 return 1;
1992 }
d50f2ab6 1993 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1994
c62a11fd
FB		 1995 /* We allocate both existing and potentially added groups */
1996 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1997 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1998 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1999 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 2000 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 2001 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 2002 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
2003 flex_group_count);
2004 goto failed;
772cb7c8 2005 }
772cb7c8 2006
772cb7c8 2007 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2008 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2009
2010 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2011 atomic_add(ext4_free_inodes_count(sb, gdp),
2012 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 2013 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 2014 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2015 atomic_add(ext4_used_dirs_count(sb, gdp),
2016 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2017 }
2018
2019 return 1;
2020failed:
2021 return 0;
2022}
2023
717d50e4
AD		 2024__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2025 struct ext4_group_desc *gdp)
2026{
2027 __u16 crc = 0;
2028
2029 if (sbi->s_es->s_feature_ro_compat &
2030 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
2031 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2032 __le32 le_group = cpu_to_le32(block_group);
2033
2034 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2035 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2036 crc = crc16(crc, (__u8 *)gdp, offset);
2037 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2038 /* for checksum of struct ext4_group_desc do the rest...*/
2039 if ((sbi->s_es->s_feature_incompat &
2040 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2041 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2042 crc = crc16(crc, (__u8 *)gdp + offset,
2043 le16_to_cpu(sbi->s_es->s_desc_size) -
2044 offset);
2045 }
2046
2047 return cpu_to_le16(crc);
2048}
2049
2050int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
2051 struct ext4_group_desc *gdp)
2052{
2053 if ((sbi->s_es->s_feature_ro_compat &
2054 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
2055 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
2056 return 0;
2057
2058 return 1;
2059}
2060
ac27a0ec 2061/* Called at mount-time, super-block is locked */
bfff6873
LC		 2062static int ext4_check_descriptors(struct super_block *sb,
2063 ext4_group_t *first_not_zeroed)
ac27a0ec 2064{
617ba13b
MC		 2065 struct ext4_sb_info *sbi = EXT4_SB(sb);
2066 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2067 ext4_fsblk_t last_block;
bd81d8ee
LV		 2068 ext4_fsblk_t block_bitmap;
2069 ext4_fsblk_t inode_bitmap;
2070 ext4_fsblk_t inode_table;
ce421581 2071 int flexbg_flag = 0;
bfff6873 2072 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2073
ce421581
JS		 2074 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2075 flexbg_flag = 1;
2076
af5bc92d 2077 ext4_debug("Checking group descriptors");
ac27a0ec 2078
197cd65a
AM		 2079 for (i = 0; i < sbi->s_groups_count; i++) {
2080 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2081
ce421581 2082 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2083 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2084 else
2085 last_block = first_block +
617ba13b 2086 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2087
bfff6873
LC		 2088 if ((grp == sbi->s_groups_count) &&
2089 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2090 grp = i;
2091
8fadc143 2092 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2093 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2094 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2095 "Block bitmap for group %u not in group "
b31e1552 2096 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2097 return 0;
2098 }
8fadc143 2099 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2100 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2101 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2102 "Inode bitmap for group %u not in group "
b31e1552 2103 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2104 return 0;
2105 }
8fadc143 2106 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2107 if (inode_table < first_block ||
2b2d6d01 2108 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2109 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2110 "Inode table for group %u not in group "
b31e1552 2111 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2112 return 0;
2113 }
955ce5f5 2114 ext4_lock_group(sb, i);
717d50e4 2115 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2116 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2117 "Checksum for group %u failed (%u!=%u)",
2118 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2119 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2120 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2121 ext4_unlock_group(sb, i);
8a266467 2122 return 0;
7ee1ec4c 2123 }
717d50e4 2124 }
955ce5f5 2125 ext4_unlock_group(sb, i);
ce421581
JS		 2126 if (!flexbg_flag)
2127 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2128 }
bfff6873
LC		 2129 if (NULL != first_not_zeroed)
2130 *first_not_zeroed = grp;
ac27a0ec 2131
5dee5437
TT		 2132 ext4_free_blocks_count_set(sbi->s_es,
2133 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2134 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2135 return 1;
2136}
2137
617ba13b 2138/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2139 * the superblock) which were deleted from all directories, but held open by
2140 * a process at the time of a crash. We walk the list and try to delete these
2141 * inodes at recovery time (only with a read-write filesystem).
2142 *
2143 * In order to keep the orphan inode chain consistent during traversal (in
2144 * case of crash during recovery), we link each inode into the superblock
2145 * orphan list_head and handle it the same way as an inode deletion during
2146 * normal operation (which journals the operations for us).
2147 *
2148 * We only do an iget() and an iput() on each inode, which is very safe if we
2149 * accidentally point at an in-use or already deleted inode. The worst that
2150 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2151 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2152 * e2fsck was run on this filesystem, and it must have already done the orphan
2153 * inode cleanup for us, so we can safely abort without any further action.
2154 */
2b2d6d01
TT		 2155static void ext4_orphan_cleanup(struct super_block *sb,
2156 struct ext4_super_block *es)
ac27a0ec
DK		 2157{
2158 unsigned int s_flags = sb->s_flags;
2159 int nr_orphans = 0, nr_truncates = 0;
2160#ifdef CONFIG_QUOTA
2161 int i;
2162#endif
2163 if (!es->s_last_orphan) {
2164 jbd_debug(4, "no orphan inodes to clean up\n");
2165 return;
2166 }
2167
a8f48a95 2168 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2169 ext4_msg(sb, KERN_ERR, "write access "
2170 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2171 return;
2172 }
2173
d39195c3
AG		 2174 /* Check if feature set would not allow a r/w mount */
2175 if (!ext4_feature_set_ok(sb, 0)) {
2176 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2177 "unknown ROCOMPAT features");
2178 return;
2179 }
2180
617ba13b 2181 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2182 if (es->s_last_orphan)
2183 jbd_debug(1, "Errors on filesystem, "
2184 "clearing orphan list.\n");
2185 es->s_last_orphan = 0;
2186 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2187 return;
2188 }
2189
2190 if (s_flags & MS_RDONLY) {
b31e1552 2191 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2192 sb->s_flags &= ~MS_RDONLY;
2193 }
2194#ifdef CONFIG_QUOTA
2195 /* Needed for iput() to work correctly and not trash data */
2196 sb->s_flags |= MS_ACTIVE;
2197 /* Turn on quotas so that they are updated correctly */
2198 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2199 if (EXT4_SB(sb)->s_qf_names[i]) {
2200 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2201 if (ret < 0)
b31e1552
ES		 2202 ext4_msg(sb, KERN_ERR,
2203 "Cannot turn on journaled "
2204 "quota: error %d", ret);
ac27a0ec
DK		 2205 }
2206 }
2207#endif
2208
2209 while (es->s_last_orphan) {
2210 struct inode *inode;
2211
97bd42b9
JB		 2212 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2213 if (IS_ERR(inode)) {
ac27a0ec
DK		 2214 es->s_last_orphan = 0;
2215 break;
2216 }
2217
617ba13b 2218 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2219 dquot_initialize(inode);
ac27a0ec 2220 if (inode->i_nlink) {
b31e1552
ES		 2221 ext4_msg(sb, KERN_DEBUG,
2222 "%s: truncating inode %lu to %lld bytes",
46e665e9 2223 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2224 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2225 inode->i_ino, inode->i_size);
617ba13b 2226 ext4_truncate(inode);
ac27a0ec
DK		 2227 nr_truncates++;
2228 } else {
b31e1552
ES		 2229 ext4_msg(sb, KERN_DEBUG,
2230 "%s: deleting unreferenced inode %lu",
46e665e9 2231 __func__, inode->i_ino);
ac27a0ec
DK		 2232 jbd_debug(2, "deleting unreferenced inode %lu\n",
2233 inode->i_ino);
2234 nr_orphans++;
2235 }
2236 iput(inode); /* The delete magic happens here! */
2237 }
2238
2b2d6d01 2239#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2240
2241 if (nr_orphans)
b31e1552
ES		 2242 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2243 PLURAL(nr_orphans));
ac27a0ec 2244 if (nr_truncates)
b31e1552
ES		 2245 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2246 PLURAL(nr_truncates));
ac27a0ec
DK		 2247#ifdef CONFIG_QUOTA
2248 /* Turn quotas off */
2249 for (i = 0; i < MAXQUOTAS; i++) {
2250 if (sb_dqopt(sb)->files[i])
287a8095 2251 dquot_quota_off(sb, i);
ac27a0ec
DK		 2252 }
2253#endif
2254 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2255}
0b8e58a1 2256
cd2291a4
ES		 2257/*
2258 * Maximal extent format file size.
2259 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2260 * extent format containers, within a sector_t, and within i_blocks
2261 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2262 * so that won't be a limiting factor.
2263 *
f17722f9
LC		 2264 * However there is other limiting factor. We do store extents in the form
2265 * of starting block and length, hence the resulting length of the extent
2266 * covering maximum file size must fit into on-disk format containers as
2267 * well. Given that length is always by 1 unit bigger than max unit (because
2268 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2269 *
cd2291a4
ES		 2270 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2271 */
f287a1a5 2272static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2273{
2274 loff_t res;
2275 loff_t upper_limit = MAX_LFS_FILESIZE;
2276
2277 /* small i_blocks in vfs inode? */
f287a1a5 2278 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2279 /*
90c699a9 2280 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2281 * i_block represent total blocks in 512 bytes
2282 * 32 == size of vfs inode i_blocks * 8
2283 */
2284 upper_limit = (1LL << 32) - 1;
2285
2286 /* total blocks in file system block size */
2287 upper_limit >>= (blkbits - 9);
2288 upper_limit <<= blkbits;
2289 }
2290
f17722f9
LC		 2291 /*
2292 * 32-bit extent-start container, ee_block. We lower the maxbytes
2293 * by one fs block, so ee_len can cover the extent of maximum file
2294 * size
2295 */
2296 res = (1LL << 32) - 1;
cd2291a4 2297 res <<= blkbits;
cd2291a4
ES		 2298
2299 /* Sanity check against vm- & vfs- imposed limits */
2300 if (res > upper_limit)
2301 res = upper_limit;
2302
2303 return res;
2304}
ac27a0ec 2305
ac27a0ec 2306/*
cd2291a4 2307 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2308 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2309 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2310 */
f287a1a5 2311static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2312{
617ba13b 2313 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2314 int meta_blocks;
2315 loff_t upper_limit;
0b8e58a1
AD		 2316 /* This is calculated to be the largest file size for a dense, block
2317 * mapped file such that the file's total number of 512-byte sectors,
2318 * including data and all indirect blocks, does not exceed (2^48 - 1).
2319 *
2320 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2321 * number of 512-byte sectors of the file.
0fc1b451
AK		 2322 */
2323
f287a1a5 2324 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2325 /*
90c699a9 2326 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2327 * the inode i_block field represents total file blocks in
2328 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2329 */
2330 upper_limit = (1LL << 32) - 1;
2331
2332 /* total blocks in file system block size */
2333 upper_limit >>= (bits - 9);
2334
2335 } else {
8180a562
AK		 2336 /*
2337 * We use 48 bit ext4_inode i_blocks
2338 * With EXT4_HUGE_FILE_FL set the i_blocks
2339 * represent total number of blocks in
2340 * file system block size
2341 */
0fc1b451
AK		 2342 upper_limit = (1LL << 48) - 1;
2343
0fc1b451
AK		 2344 }
2345
2346 /* indirect blocks */
2347 meta_blocks = 1;
2348 /* double indirect blocks */
2349 meta_blocks += 1 + (1LL << (bits-2));
2350 /* tripple indirect blocks */
2351 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2352
2353 upper_limit -= meta_blocks;
2354 upper_limit <<= bits;
ac27a0ec
DK		 2355
2356 res += 1LL << (bits-2);
2357 res += 1LL << (2*(bits-2));
2358 res += 1LL << (3*(bits-2));
2359 res <<= bits;
2360 if (res > upper_limit)
2361 res = upper_limit;
0fc1b451
AK		 2362
2363 if (res > MAX_LFS_FILESIZE)
2364 res = MAX_LFS_FILESIZE;
2365
ac27a0ec
DK		 2366 return res;
2367}
2368
617ba13b 2369static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2370 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2371{
617ba13b 2372 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2373 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2374 int has_super = 0;
2375
2376 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2377
617ba13b 2378 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2379 nr < first_meta_bg)
70bbb3e0 2380 return logical_sb_block + nr + 1;
ac27a0ec 2381 bg = sbi->s_desc_per_block * nr;
617ba13b 2382 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2383 has_super = 1;
0b8e58a1 2384
617ba13b 2385 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2386}
2387
c9de560d
AT		 2388/**
2389 * ext4_get_stripe_size: Get the stripe size.
2390 * @sbi: In memory super block info
2391 *
2392 * If we have specified it via mount option, then
2393 * use the mount option value. If the value specified at mount time is
2394 * greater than the blocks per group use the super block value.
2395 * If the super block value is greater than blocks per group return 0.
2396 * Allocator needs it be less than blocks per group.
2397 *
2398 */
2399static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2400{
2401 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2402 unsigned long stripe_width =
2403 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2404 int ret;
c9de560d
AT		 2405
2406 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2407 ret = sbi->s_stripe;
2408 else if (stripe_width <= sbi->s_blocks_per_group)
2409 ret = stripe_width;
2410 else if (stride <= sbi->s_blocks_per_group)
2411 ret = stride;
2412 else
2413 ret = 0;
c9de560d 2414
3eb08658
DE		 2415 /*
2416 * If the stripe width is 1, this makes no sense and
2417 * we set it to 0 to turn off stripe handling code.
2418 */
2419 if (ret <= 1)
2420 ret = 0;
c9de560d 2421
3eb08658 2422 return ret;
c9de560d 2423}
ac27a0ec 2424
3197ebdb
TT		 2425/* sysfs supprt */
2426
2427struct ext4_attr {
2428 struct attribute attr;
2429 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2430 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2431 const char *, size_t);
2432 int offset;
2433};
2434
2435static int parse_strtoul(const char *buf,
2436 unsigned long max, unsigned long *value)
2437{
2438 char *endp;
2439
e7d2860b
AGR		 2440 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2441 endp = skip_spaces(endp);
3197ebdb
TT		 2442 if (*endp || *value > max)
2443 return -EINVAL;
2444
2445 return 0;
2446}
2447
2448static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2449 struct ext4_sb_info *sbi,
2450 char *buf)
2451{
2452 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2453 (s64) EXT4_C2B(sbi,
2454 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2455}
2456
2457static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2458 struct ext4_sb_info *sbi, char *buf)
2459{
2460 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2461
f613dfcb
TT		 2462 if (!sb->s_bdev->bd_part)
2463 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2464 return snprintf(buf, PAGE_SIZE, "%lu\n",
2465 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2466 sbi->s_sectors_written_start) >> 1);
2467}
2468
2469static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2470 struct ext4_sb_info *sbi, char *buf)
2471{
2472 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2473
f613dfcb
TT		 2474 if (!sb->s_bdev->bd_part)
2475 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2476 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2477 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2478 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2479 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2480}
2481
77f4135f
VH		 2482static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2483 struct ext4_sb_info *sbi, char *buf)
2484{
2485 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2486}
2487
2488static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2489 struct ext4_sb_info *sbi, char *buf)
2490{
2491 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2492}
2493
3197ebdb
TT		 2494static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2495 struct ext4_sb_info *sbi,
2496 const char *buf, size_t count)
2497{
2498 unsigned long t;
2499
2500 if (parse_strtoul(buf, 0x40000000, &t))
2501 return -EINVAL;
2502
5dbd571d 2503 if (t && !is_power_of_2(t))
3197ebdb
TT		 2504 return -EINVAL;
2505
2506 sbi->s_inode_readahead_blks = t;
2507 return count;
2508}
2509
2510static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2511 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2512{
2513 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2514
2515 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2516}
2517
2518static ssize_t sbi_ui_store(struct ext4_attr *a,
2519 struct ext4_sb_info *sbi,
2520 const char *buf, size_t count)
2521{
2522 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2523 unsigned long t;
2524
2525 if (parse_strtoul(buf, 0xffffffff, &t))
2526 return -EINVAL;
2527 *ui = t;
2528 return count;
2529}
2530
2531#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2532static struct ext4_attr ext4_attr_##_name = { \
2533 .attr = {.name = __stringify(_name), .mode = _mode }, \
2534 .show = _show, \
2535 .store = _store, \
2536 .offset = offsetof(struct ext4_sb_info, _elname), \
2537}
2538#define EXT4_ATTR(name, mode, show, store) \
2539static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2540
857ac889 2541#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2542#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2543#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2544#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2545 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2546#define ATTR_LIST(name) &ext4_attr_##name.attr
2547
2548EXT4_RO_ATTR(delayed_allocation_blocks);
2549EXT4_RO_ATTR(session_write_kbytes);
2550EXT4_RO_ATTR(lifetime_write_kbytes);
77f4135f
VH		 2551EXT4_RO_ATTR(extent_cache_hits);
2552EXT4_RO_ATTR(extent_cache_misses);
3197ebdb
TT		 2553EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2554 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2555EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2556EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2557EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2558EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2559EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2560EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2561EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2562EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2563
2564static struct attribute *ext4_attrs[] = {
2565 ATTR_LIST(delayed_allocation_blocks),
2566 ATTR_LIST(session_write_kbytes),
2567 ATTR_LIST(lifetime_write_kbytes),
77f4135f
VH		 2568 ATTR_LIST(extent_cache_hits),
2569 ATTR_LIST(extent_cache_misses),
3197ebdb 2570 ATTR_LIST(inode_readahead_blks),
11013911 2571 ATTR_LIST(inode_goal),
3197ebdb
TT		 2572 ATTR_LIST(mb_stats),
2573 ATTR_LIST(mb_max_to_scan),
2574 ATTR_LIST(mb_min_to_scan),
2575 ATTR_LIST(mb_order2_req),
2576 ATTR_LIST(mb_stream_req),
2577 ATTR_LIST(mb_group_prealloc),
55138e0b 2578 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2579 NULL,
2580};
2581
857ac889
LC		 2582/* Features this copy of ext4 supports */
2583EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2584EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2585
2586static struct attribute *ext4_feat_attrs[] = {
2587 ATTR_LIST(lazy_itable_init),
27ee40df 2588 ATTR_LIST(batched_discard),
857ac889
LC		 2589 NULL,
2590};
2591
3197ebdb
TT		 2592static ssize_t ext4_attr_show(struct kobject *kobj,
2593 struct attribute *attr, char *buf)
2594{
2595 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2596 s_kobj);
2597 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2598
2599 return a->show ? a->show(a, sbi, buf) : 0;
2600}
2601
2602static ssize_t ext4_attr_store(struct kobject *kobj,
2603 struct attribute *attr,
2604 const char *buf, size_t len)
2605{
2606 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2607 s_kobj);
2608 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2609
2610 return a->store ? a->store(a, sbi, buf, len) : 0;
2611}
2612
2613static void ext4_sb_release(struct kobject *kobj)
2614{
2615 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2616 s_kobj);
2617 complete(&sbi->s_kobj_unregister);
2618}
2619
52cf25d0 2620static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2621 .show = ext4_attr_show,
2622 .store = ext4_attr_store,
2623};
2624
2625static struct kobj_type ext4_ktype = {
2626 .default_attrs = ext4_attrs,
2627 .sysfs_ops = &ext4_attr_ops,
2628 .release = ext4_sb_release,
2629};
2630
857ac889
LC		 2631static void ext4_feat_release(struct kobject *kobj)
2632{
2633 complete(&ext4_feat->f_kobj_unregister);
2634}
2635
2636static struct kobj_type ext4_feat_ktype = {
2637 .default_attrs = ext4_feat_attrs,
2638 .sysfs_ops = &ext4_attr_ops,
2639 .release = ext4_feat_release,
2640};
2641
a13fb1a4
ES		 2642/*
2643 * Check whether this filesystem can be mounted based on
2644 * the features present and the RDONLY/RDWR mount requested.
2645 * Returns 1 if this filesystem can be mounted as requested,
2646 * 0 if it cannot be.
2647 */
2648static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2649{
2650 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2651 ext4_msg(sb, KERN_ERR,
2652 "Couldn't mount because of "
2653 "unsupported optional features (%x)",
2654 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2655 ~EXT4_FEATURE_INCOMPAT_SUPP));
2656 return 0;
2657 }
2658
2659 if (readonly)
2660 return 1;
2661
2662 /* Check that feature set is OK for a read-write mount */
2663 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2664 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2665 "unsupported optional features (%x)",
2666 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2667 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2668 return 0;
2669 }
2670 /*
2671 * Large file size enabled file system can only be mounted
2672 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2673 */
2674 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2675 if (sizeof(blkcnt_t) < sizeof(u64)) {
2676 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2677 "cannot be mounted RDWR without "
2678 "CONFIG_LBDAF");
2679 return 0;
2680 }
2681 }
bab08ab9
TT		 2682 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2683 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2684 ext4_msg(sb, KERN_ERR,
2685 "Can't support bigalloc feature without "
2686 "extents feature\n");
2687 return 0;
2688 }
a13fb1a4
ES		 2689 return 1;
2690}
2691
66e61a9e
TT		 2692/*
2693 * This function is called once a day if we have errors logged
2694 * on the file system
2695 */
2696static void print_daily_error_info(unsigned long arg)
2697{
2698 struct super_block *sb = (struct super_block *) arg;
2699 struct ext4_sb_info *sbi;
2700 struct ext4_super_block *es;
2701
2702 sbi = EXT4_SB(sb);
2703 es = sbi->s_es;
2704
2705 if (es->s_error_count)
2706 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2707 le32_to_cpu(es->s_error_count));
2708 if (es->s_first_error_time) {
2709 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2710 sb->s_id, le32_to_cpu(es->s_first_error_time),
2711 (int) sizeof(es->s_first_error_func),
2712 es->s_first_error_func,
2713 le32_to_cpu(es->s_first_error_line));
2714 if (es->s_first_error_ino)
2715 printk(": inode %u",
2716 le32_to_cpu(es->s_first_error_ino));
2717 if (es->s_first_error_block)
2718 printk(": block %llu", (unsigned long long)
2719 le64_to_cpu(es->s_first_error_block));
2720 printk("\n");
2721 }
2722 if (es->s_last_error_time) {
2723 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2724 sb->s_id, le32_to_cpu(es->s_last_error_time),
2725 (int) sizeof(es->s_last_error_func),
2726 es->s_last_error_func,
2727 le32_to_cpu(es->s_last_error_line));
2728 if (es->s_last_error_ino)
2729 printk(": inode %u",
2730 le32_to_cpu(es->s_last_error_ino));
2731 if (es->s_last_error_block)
2732 printk(": block %llu", (unsigned long long)
2733 le64_to_cpu(es->s_last_error_block));
2734 printk("\n");
2735 }
2736 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2737}
2738
bfff6873
LC		 2739/* Find next suitable group and run ext4_init_inode_table */
2740static int ext4_run_li_request(struct ext4_li_request *elr)
2741{
2742 struct ext4_group_desc *gdp = NULL;
2743 ext4_group_t group, ngroups;
2744 struct super_block *sb;
2745 unsigned long timeout = 0;
2746 int ret = 0;
2747
2748 sb = elr->lr_super;
2749 ngroups = EXT4_SB(sb)->s_groups_count;
2750
2751 for (group = elr->lr_next_group; group < ngroups; group++) {
2752 gdp = ext4_get_group_desc(sb, group, NULL);
2753 if (!gdp) {
2754 ret = 1;
2755 break;
2756 }
2757
2758 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2759 break;
2760 }
2761
2762 if (group == ngroups)
2763 ret = 1;
2764
2765 if (!ret) {
2766 timeout = jiffies;
2767 ret = ext4_init_inode_table(sb, group,
2768 elr->lr_timeout ? 0 : 1);
2769 if (elr->lr_timeout == 0) {
51ce6511
LC		 2770 timeout = (jiffies - timeout) *
2771 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2772 elr->lr_timeout = timeout;
2773 }
2774 elr->lr_next_sched = jiffies + elr->lr_timeout;
2775 elr->lr_next_group = group + 1;
2776 }
2777
2778 return ret;
2779}
2780
2781/*
2782 * Remove lr_request from the list_request and free the
4ed5c033 2783 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2784 */
2785static void ext4_remove_li_request(struct ext4_li_request *elr)
2786{
2787 struct ext4_sb_info *sbi;
2788
2789 if (!elr)
2790 return;
2791
2792 sbi = elr->lr_sbi;
2793
2794 list_del(&elr->lr_request);
2795 sbi->s_li_request = NULL;
2796 kfree(elr);
2797}
2798
2799static void ext4_unregister_li_request(struct super_block *sb)
2800{
1bb933fb
LC		 2801 mutex_lock(&ext4_li_mtx);
2802 if (!ext4_li_info) {
2803 mutex_unlock(&ext4_li_mtx);
bfff6873 2804 return;
1bb933fb 2805 }
bfff6873
LC		 2806
2807 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2808 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2809 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2810 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2811}
2812
8f1f7453
ES		 2813static struct task_struct *ext4_lazyinit_task;
2814
bfff6873
LC		 2815/*
2816 * This is the function where ext4lazyinit thread lives. It walks
2817 * through the request list searching for next scheduled filesystem.
2818 * When such a fs is found, run the lazy initialization request
2819 * (ext4_rn_li_request) and keep track of the time spend in this
2820 * function. Based on that time we compute next schedule time of
2821 * the request. When walking through the list is complete, compute
2822 * next waking time and put itself into sleep.
2823 */
2824static int ext4_lazyinit_thread(void *arg)
2825{
2826 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2827 struct list_head *pos, *n;
2828 struct ext4_li_request *elr;
4ed5c033 2829 unsigned long next_wakeup, cur;
bfff6873
LC		 2830
2831 BUG_ON(NULL == eli);
2832
bfff6873
LC		 2833cont_thread:
2834 while (true) {
2835 next_wakeup = MAX_JIFFY_OFFSET;
2836
2837 mutex_lock(&eli->li_list_mtx);
2838 if (list_empty(&eli->li_request_list)) {
2839 mutex_unlock(&eli->li_list_mtx);
2840 goto exit_thread;
2841 }
2842
2843 list_for_each_safe(pos, n, &eli->li_request_list) {
2844 elr = list_entry(pos, struct ext4_li_request,
2845 lr_request);
2846
b2c78cd0
TT		 2847 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2848 if (ext4_run_li_request(elr) != 0) {
2849 /* error, remove the lazy_init job */
2850 ext4_remove_li_request(elr);
2851 continue;
2852 }
bfff6873
LC		 2853 }
2854
2855 if (time_before(elr->lr_next_sched, next_wakeup))
2856 next_wakeup = elr->lr_next_sched;
2857 }
2858 mutex_unlock(&eli->li_list_mtx);
2859
a0acae0e 2860 try_to_freeze();
bfff6873 2861
4ed5c033
LC		 2862 cur = jiffies;
2863 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2864 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2865 cond_resched();
2866 continue;
2867 }
2868
4ed5c033
LC		 2869 schedule_timeout_interruptible(next_wakeup - cur);
2870
8f1f7453
ES		 2871 if (kthread_should_stop()) {
2872 ext4_clear_request_list();
2873 goto exit_thread;
2874 }
bfff6873
LC		 2875 }
2876
2877exit_thread:
2878 /*
2879 * It looks like the request list is empty, but we need
2880 * to check it under the li_list_mtx lock, to prevent any
2881 * additions into it, and of course we should lock ext4_li_mtx
2882 * to atomically free the list and ext4_li_info, because at
2883 * this point another ext4 filesystem could be registering
2884 * new one.
2885 */
2886 mutex_lock(&ext4_li_mtx);
2887 mutex_lock(&eli->li_list_mtx);
2888 if (!list_empty(&eli->li_request_list)) {
2889 mutex_unlock(&eli->li_list_mtx);
2890 mutex_unlock(&ext4_li_mtx);
2891 goto cont_thread;
2892 }
2893 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2894 kfree(ext4_li_info);
2895 ext4_li_info = NULL;
2896 mutex_unlock(&ext4_li_mtx);
2897
2898 return 0;
2899}
2900
2901static void ext4_clear_request_list(void)
2902{
2903 struct list_head *pos, *n;
2904 struct ext4_li_request *elr;
2905
2906 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2907 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2908 elr = list_entry(pos, struct ext4_li_request,
2909 lr_request);
2910 ext4_remove_li_request(elr);
2911 }
2912 mutex_unlock(&ext4_li_info->li_list_mtx);
2913}
2914
2915static int ext4_run_lazyinit_thread(void)
2916{
8f1f7453
ES		 2917 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2918 ext4_li_info, "ext4lazyinit");
2919 if (IS_ERR(ext4_lazyinit_task)) {
2920 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2921 ext4_clear_request_list();
bfff6873
LC		 2922 kfree(ext4_li_info);
2923 ext4_li_info = NULL;
2924 printk(KERN_CRIT "EXT4: error %d creating inode table "
2925 "initialization thread\n",
2926 err);
2927 return err;
2928 }
2929 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2930 return 0;
2931}
2932
2933/*
2934 * Check whether it make sense to run itable init. thread or not.
2935 * If there is at least one uninitialized inode table, return
2936 * corresponding group number, else the loop goes through all
2937 * groups and return total number of groups.
2938 */
2939static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2940{
2941 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2942 struct ext4_group_desc *gdp = NULL;
2943
2944 for (group = 0; group < ngroups; group++) {
2945 gdp = ext4_get_group_desc(sb, group, NULL);
2946 if (!gdp)
2947 continue;
2948
2949 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2950 break;
2951 }
2952
2953 return group;
2954}
2955
2956static int ext4_li_info_new(void)
2957{
2958 struct ext4_lazy_init *eli = NULL;
2959
2960 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2961 if (!eli)
2962 return -ENOMEM;
2963
bfff6873
LC		 2964 INIT_LIST_HEAD(&eli->li_request_list);
2965 mutex_init(&eli->li_list_mtx);
2966
bfff6873
LC		 2967 eli->li_state |= EXT4_LAZYINIT_QUIT;
2968
2969 ext4_li_info = eli;
2970
2971 return 0;
2972}
2973
2974static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2975 ext4_group_t start)
2976{
2977 struct ext4_sb_info *sbi = EXT4_SB(sb);
2978 struct ext4_li_request *elr;
2979 unsigned long rnd;
2980
2981 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2982 if (!elr)
2983 return NULL;
2984
2985 elr->lr_super = sb;
2986 elr->lr_sbi = sbi;
2987 elr->lr_next_group = start;
2988
2989 /*
2990 * Randomize first schedule time of the request to
2991 * spread the inode table initialization requests
2992 * better.
2993 */
2994 get_random_bytes(&rnd, sizeof(rnd));
2995 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2996 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2997
2998 return elr;
2999}
3000
3001static int ext4_register_li_request(struct super_block *sb,
3002 ext4_group_t first_not_zeroed)
3003{
3004 struct ext4_sb_info *sbi = EXT4_SB(sb);
3005 struct ext4_li_request *elr;
3006 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3007 int ret = 0;
bfff6873 3008
51ce6511
LC		 3009 if (sbi->s_li_request != NULL) {
3010 /*
3011 * Reset timeout so it can be computed again, because
3012 * s_li_wait_mult might have changed.
3013 */
3014 sbi->s_li_request->lr_timeout = 0;
beed5ecb 3015 return 0;
51ce6511 3016 }
bfff6873
LC		 3017
3018 if (first_not_zeroed == ngroups ||
3019 (sb->s_flags & MS_RDONLY) ||
55ff3840 3020 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 3021 return 0;
bfff6873
LC		 3022
3023 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 3024 if (!elr)
3025 return -ENOMEM;
bfff6873
LC		 3026
3027 mutex_lock(&ext4_li_mtx);
3028
3029 if (NULL == ext4_li_info) {
3030 ret = ext4_li_info_new();
3031 if (ret)
3032 goto out;
3033 }
3034
3035 mutex_lock(&ext4_li_info->li_list_mtx);
3036 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3037 mutex_unlock(&ext4_li_info->li_list_mtx);
3038
3039 sbi->s_li_request = elr;
46e4690b
TM		 3040 /*
3041 * set elr to NULL here since it has been inserted to
3042 * the request_list and the removal and free of it is
3043 * handled by ext4_clear_request_list from now on.
3044 */
3045 elr = NULL;
bfff6873
LC		 3046
3047 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3048 ret = ext4_run_lazyinit_thread();
3049 if (ret)
3050 goto out;
3051 }
bfff6873 3052out:
beed5ecb
NK		 3053 mutex_unlock(&ext4_li_mtx);
3054 if (ret)
bfff6873 3055 kfree(elr);
bfff6873
LC		 3056 return ret;
3057}
3058
3059/*
3060 * We do not need to lock anything since this is called on
3061 * module unload.
3062 */
3063static void ext4_destroy_lazyinit_thread(void)
3064{
3065 /*
3066 * If thread exited earlier
3067 * there's nothing to be done.
3068 */
8f1f7453 3069 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3070 return;
3071
8f1f7453 3072 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3073}
3074
2b2d6d01 3075static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3076{
d4c402d9 3077 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3078 struct buffer_head *bh;
617ba13b
MC		 3079 struct ext4_super_block *es = NULL;
3080 struct ext4_sb_info *sbi;
3081 ext4_fsblk_t block;
3082 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3083 ext4_fsblk_t logical_sb_block;
ac27a0ec 3084 unsigned long offset = 0;
ac27a0ec
DK		 3085 unsigned long journal_devnum = 0;
3086 unsigned long def_mount_opts;
3087 struct inode *root;
9f6200bb 3088 char *cp;
0390131b 3089 const char *descr;
dcc7dae3 3090 int ret = -ENOMEM;
281b5995 3091 int blocksize, clustersize;
4ec11028
TT		 3092 unsigned int db_count;
3093 unsigned int i;
281b5995 3094 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3095 __u64 blocks_count;
833f4077 3096 int err;
b3881f74 3097 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3098 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3099
3100 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3101 if (!sbi)
dcc7dae3 3102 goto out_free_orig;
705895b6
PE		 3103
3104 sbi->s_blockgroup_lock =
3105 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3106 if (!sbi->s_blockgroup_lock) {
3107 kfree(sbi);
dcc7dae3 3108 goto out_free_orig;
705895b6 3109 }
ac27a0ec
DK		 3110 sb->s_fs_info = sbi;
3111 sbi->s_mount_opt = 0;
617ba13b
MC		 3112 sbi->s_resuid = EXT4_DEF_RESUID;
3113 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 3114 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3115 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3116 if (sb->s_bdev->bd_part)
3117 sbi->s_sectors_written_start =
3118 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3119
9f6200bb
TT		 3120 /* Cleanup superblock name */
3121 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3122 *cp = '!';
3123
dcc7dae3 3124 ret = -EINVAL;
617ba13b 3125 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3126 if (!blocksize) {
b31e1552 3127 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3128 goto out_fail;
3129 }
3130
3131 /*
617ba13b 3132 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3133 * block sizes. We need to calculate the offset from buffer start.
3134 */
617ba13b 3135 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3136 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3137 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3138 } else {
70bbb3e0 3139 logical_sb_block = sb_block;
ac27a0ec
DK		 3140 }
3141
70bbb3e0 3142 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3143 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3144 goto out_fail;
3145 }
3146 /*
3147 * Note: s_es must be initialized as soon as possible because
617ba13b 3148 * some ext4 macro-instructions depend on its value
ac27a0ec 3149 */
617ba13b 3150 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3151 sbi->s_es = es;
3152 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3153 if (sb->s_magic != EXT4_SUPER_MAGIC)
3154 goto cantfind_ext4;
afc32f7e 3155 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3156
3157 /* Set defaults before we parse the mount options */
3158 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3159 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3160 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3161 set_opt(sb, DEBUG);
87f26807 3162 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3163 set_opt(sb, GRPID);
617ba13b 3164 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3165 set_opt(sb, NO_UID32);
ea663336 3166 /* xattr user namespace & acls are now defaulted on */
03010a33 3167#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3168 set_opt(sb, XATTR_USER);
2e7842b8 3169#endif
03010a33 3170#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3171 set_opt(sb, POSIX_ACL);
2e7842b8 3172#endif
6fd7a467 3173 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3174 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3175 set_opt(sb, JOURNAL_DATA);
617ba13b 3176 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3177 set_opt(sb, ORDERED_DATA);
617ba13b 3178 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3179 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3180
3181 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3182 set_opt(sb, ERRORS_PANIC);
bb4f397a 3183 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3184 set_opt(sb, ERRORS_CONT);
bb4f397a 3185 else
fd8c37ec 3186 set_opt(sb, ERRORS_RO);
8b67f04a 3187 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3188 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3189 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3190 set_opt(sb, DISCARD);
ac27a0ec
DK		 3191
3192 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3193 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3194 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3195 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3196 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3197
8b67f04a 3198 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3199 set_opt(sb, BARRIER);
ac27a0ec 3200
dd919b98
AK		 3201 /*
3202 * enable delayed allocation by default
3203 * Use -o nodelalloc to turn it off
3204 */
8b67f04a
TT		 3205 if (!IS_EXT3_SB(sb) &&
3206 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3207 set_opt(sb, DELALLOC);
dd919b98 3208
51ce6511
LC		 3209 /*
3210 * set default s_li_wait_mult for lazyinit, for the case there is
3211 * no mount option specified.
3212 */
3213 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3214
8b67f04a 3215 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3216 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3217 ext4_msg(sb, KERN_WARNING,
3218 "failed to parse options in superblock: %s",
3219 sbi->s_es->s_mount_opts);
3220 }
b3881f74 3221 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3222 &journal_ioprio, 0))
ac27a0ec
DK		 3223 goto failed_mount;
3224
56889787
TT		 3225 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3226 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3227 "with data=journal disables delayed "
3228 "allocation and O_DIRECT support!\n");
3229 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3230 ext4_msg(sb, KERN_ERR, "can't mount with "
3231 "both data=journal and delalloc");
3232 goto failed_mount;
3233 }
3234 if (test_opt(sb, DIOREAD_NOLOCK)) {
3235 ext4_msg(sb, KERN_ERR, "can't mount with "
3236 "both data=journal and delalloc");
3237 goto failed_mount;
3238 }
3239 if (test_opt(sb, DELALLOC))
3240 clear_opt(sb, DELALLOC);
3241 }
3242
3243 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3244 if (test_opt(sb, DIOREAD_NOLOCK)) {
3245 if (blocksize < PAGE_SIZE) {
3246 ext4_msg(sb, KERN_ERR, "can't mount with "
3247 "dioread_nolock if block size != PAGE_SIZE");
3248 goto failed_mount;
3249 }
3250 }
3251
ac27a0ec 3252 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3253 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3254
617ba13b
MC		 3255 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3256 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3257 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3258 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3259 ext4_msg(sb, KERN_WARNING,
3260 "feature flags set on rev 0 fs, "
3261 "running e2fsck is recommended");
469108ff 3262
2035e776
TT		 3263 if (IS_EXT2_SB(sb)) {
3264 if (ext2_feature_set_ok(sb))
3265 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3266 "using the ext4 subsystem");
3267 else {
3268 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3269 "to feature incompatibilities");
3270 goto failed_mount;
3271 }
3272 }
3273
3274 if (IS_EXT3_SB(sb)) {
3275 if (ext3_feature_set_ok(sb))
3276 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3277 "using the ext4 subsystem");
3278 else {
3279 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3280 "to feature incompatibilities");
3281 goto failed_mount;
3282 }
3283 }
3284
ac27a0ec
DK		 3285 /*
3286 * Check feature flags regardless of the revision level, since we
3287 * previously didn't change the revision level when setting the flags,
3288 * so there is a chance incompat flags are set on a rev 0 filesystem.
3289 */
a13fb1a4 3290 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3291 goto failed_mount;
a13fb1a4 3292
617ba13b
MC		 3293 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3294 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3295 ext4_msg(sb, KERN_ERR,
3296 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3297 goto failed_mount;
3298 }
3299
ac27a0ec 3300 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3301 /* Validate the filesystem blocksize */
3302 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3303 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3304 blocksize);
ac27a0ec
DK		 3305 goto failed_mount;
3306 }
3307
2b2d6d01 3308 brelse(bh);
70bbb3e0
AM		 3309 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3310 offset = do_div(logical_sb_block, blocksize);
3311 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3312 if (!bh) {
b31e1552
ES		 3313 ext4_msg(sb, KERN_ERR,
3314 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3315 goto failed_mount;
3316 }
617ba13b 3317 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3318 sbi->s_es = es;
617ba13b 3319 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3320 ext4_msg(sb, KERN_ERR,
3321 "Magic mismatch, very weird!");
ac27a0ec
DK		 3322 goto failed_mount;
3323 }
3324 }
3325
a13fb1a4
ES		 3326 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3327 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3328 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3329 has_huge_files);
3330 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3331
617ba13b
MC		 3332 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3333 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3334 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3335 } else {
3336 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3337 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3338 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3339 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3340 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3341 ext4_msg(sb, KERN_ERR,
3342 "unsupported inode size: %d",
2b2d6d01 3343 sbi->s_inode_size);
ac27a0ec
DK		 3344 goto failed_mount;
3345 }
ef7f3835
KS		 3346 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3347 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3348 }
0b8e58a1 3349
0d1ee42f
AR		 3350 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3351 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3352 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3353 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3354 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3355 ext4_msg(sb, KERN_ERR,
3356 "unsupported descriptor size %lu",
0d1ee42f
AR		 3357 sbi->s_desc_size);
3358 goto failed_mount;
3359 }
3360 } else
3361 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3362
ac27a0ec 3363 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3364 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3365 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3366 goto cantfind_ext4;
0b8e58a1 3367
617ba13b 3368 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3369 if (sbi->s_inodes_per_block == 0)
617ba13b 3370 goto cantfind_ext4;
ac27a0ec
DK		 3371 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3372 sbi->s_inodes_per_block;
0d1ee42f 3373 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3374 sbi->s_sbh = bh;
3375 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3376 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3377 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3378
2b2d6d01 3379 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3380 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3381 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3382 i = le32_to_cpu(es->s_flags);
3383 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3384 sbi->s_hash_unsigned = 3;
3385 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3386#ifdef __CHAR_UNSIGNED__
3387 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3388 sbi->s_hash_unsigned = 3;
3389#else
3390 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3391#endif
3392 sb->s_dirt = 1;
3393 }
ac27a0ec 3394
281b5995
TT		 3395 /* Handle clustersize */
3396 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3397 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3398 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3399 if (has_bigalloc) {
3400 if (clustersize < blocksize) {
3401 ext4_msg(sb, KERN_ERR,
3402 "cluster size (%d) smaller than "
3403 "block size (%d)", clustersize, blocksize);
3404 goto failed_mount;
3405 }
3406 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3407 le32_to_cpu(es->s_log_block_size);
3408 sbi->s_clusters_per_group =
3409 le32_to_cpu(es->s_clusters_per_group);
3410 if (sbi->s_clusters_per_group > blocksize * 8) {
3411 ext4_msg(sb, KERN_ERR,
3412 "#clusters per group too big: %lu",
3413 sbi->s_clusters_per_group);
3414 goto failed_mount;
3415 }
3416 if (sbi->s_blocks_per_group !=
3417 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3418 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3419 "clusters per group (%lu) inconsistent",
3420 sbi->s_blocks_per_group,
3421 sbi->s_clusters_per_group);
3422 goto failed_mount;
3423 }
3424 } else {
3425 if (clustersize != blocksize) {
3426 ext4_warning(sb, "fragment/cluster size (%d) != "
3427 "block size (%d)", clustersize,
3428 blocksize);
3429 clustersize = blocksize;
3430 }
3431 if (sbi->s_blocks_per_group > blocksize * 8) {
3432 ext4_msg(sb, KERN_ERR,
3433 "#blocks per group too big: %lu",
3434 sbi->s_blocks_per_group);
3435 goto failed_mount;
3436 }
3437 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3438 sbi->s_cluster_bits = 0;
ac27a0ec 3439 }
281b5995
TT		 3440 sbi->s_cluster_ratio = clustersize / blocksize;
3441
ac27a0ec 3442 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3443 ext4_msg(sb, KERN_ERR,
3444 "#inodes per group too big: %lu",
2b2d6d01 3445 sbi->s_inodes_per_group);
ac27a0ec
DK		 3446 goto failed_mount;
3447 }
3448
bf43d84b
ES		 3449 /*
3450 * Test whether we have more sectors than will fit in sector_t,
3451 * and whether the max offset is addressable by the page cache.
3452 */
5a9ae68a 3453 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3454 ext4_blocks_count(es));
5a9ae68a 3455 if (err) {
b31e1552 3456 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3457 " too large to mount safely on this system");
ac27a0ec 3458 if (sizeof(sector_t) < 8)
90c699a9 3459 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3460 ret = err;
ac27a0ec
DK		 3461 goto failed_mount;
3462 }
3463
617ba13b
MC		 3464 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3465 goto cantfind_ext4;
e7c95593 3466
0f2ddca6
FTN		 3467 /* check blocks count against device size */
3468 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3469 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3470 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3471 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3472 ext4_blocks_count(es), blocks_count);
3473 goto failed_mount;
3474 }
3475
0b8e58a1
AD		 3476 /*
3477 * It makes no sense for the first data block to be beyond the end
3478 * of the filesystem.
3479 */
3480 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3481 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3482 "block %u is beyond end of filesystem (%llu)",
3483 le32_to_cpu(es->s_first_data_block),
3484 ext4_blocks_count(es));
e7c95593
ES		 3485 goto failed_mount;
3486 }
bd81d8ee
LV		 3487 blocks_count = (ext4_blocks_count(es) -
3488 le32_to_cpu(es->s_first_data_block) +
3489 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3490 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3491 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3492 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3493 "(block count %llu, first data block %u, "
b31e1552 3494 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3495 ext4_blocks_count(es),
3496 le32_to_cpu(es->s_first_data_block),
3497 EXT4_BLOCKS_PER_GROUP(sb));
3498 goto failed_mount;
3499 }
bd81d8ee 3500 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3501 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3502 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3503 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3504 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3505 sbi->s_group_desc = ext4_kvmalloc(db_count *
3506 sizeof(struct buffer_head *),
3507 GFP_KERNEL);
ac27a0ec 3508 if (sbi->s_group_desc == NULL) {
b31e1552 3509 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3510 goto failed_mount;
3511 }
3512
9f6200bb
TT		 3513 if (ext4_proc_root)
3514 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3515
705895b6 3516 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3517
3518 for (i = 0; i < db_count; i++) {
70bbb3e0 3519 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3520 sbi->s_group_desc[i] = sb_bread(sb, block);
3521 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3522 ext4_msg(sb, KERN_ERR,
3523 "can't read group descriptor %d", i);
ac27a0ec
DK		 3524 db_count = i;
3525 goto failed_mount2;
3526 }
3527 }
bfff6873 3528 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3529 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3530 goto failed_mount2;
3531 }
772cb7c8
JS		 3532 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3533 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3534 ext4_msg(sb, KERN_ERR,
3535 "unable to initialize "
3536 "flex_bg meta info!");
772cb7c8
JS		 3537 goto failed_mount2;
3538 }
3539
ac27a0ec
DK		 3540 sbi->s_gdb_count = db_count;
3541 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3542 spin_lock_init(&sbi->s_next_gen_lock);
3543
04496411
TM		 3544 init_timer(&sbi->s_err_report);
3545 sbi->s_err_report.function = print_daily_error_info;
3546 sbi->s_err_report.data = (unsigned long) sb;
3547
57042651 3548 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3549 ext4_count_free_clusters(sb));
ce7e010a
TT		 3550 if (!err) {
3551 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3552 ext4_count_free_inodes(sb));
3553 }
3554 if (!err) {
3555 err = percpu_counter_init(&sbi->s_dirs_counter,
3556 ext4_count_dirs(sb));
3557 }
3558 if (!err) {
57042651 3559 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3560 }
3561 if (err) {
3562 ext4_msg(sb, KERN_ERR, "insufficient memory");
3563 goto failed_mount3;
3564 }
3565
c9de560d 3566 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3567 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3568
ac27a0ec
DK		 3569 /*
3570 * set up enough so that it can read an inode
3571 */
9ca92389
TT		 3572 if (!test_opt(sb, NOLOAD) &&
3573 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3574 sb->s_op = &ext4_sops;
3575 else
3576 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3577 sb->s_export_op = &ext4_export_ops;
3578 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3579#ifdef CONFIG_QUOTA
617ba13b
MC		 3580 sb->s_qcop = &ext4_qctl_operations;
3581 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3582#endif
f2fa2ffc
AK		 3583 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3584
ac27a0ec 3585 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3586 mutex_init(&sbi->s_orphan_lock);
8f82f840 3587 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3588
3589 sb->s_root = NULL;
3590
3591 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3592 EXT4_HAS_INCOMPAT_FEATURE(sb,
3593 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3594
c5e06d10
JL		 3595 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3596 !(sb->s_flags & MS_RDONLY))
3597 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3598 goto failed_mount3;
3599
ac27a0ec
DK		 3600 /*
3601 * The first inode we look at is the journal inode. Don't try
3602 * root first: it may be modified in the journal!
3603 */
3604 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3605 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3606 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3607 goto failed_mount3;
0390131b
FM		 3608 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3609 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3610 ext4_msg(sb, KERN_ERR, "required journal recovery "
3611 "suppressed and not mounted read-only");
744692dc 3612 goto failed_mount_wq;
ac27a0ec 3613 } else {
fd8c37ec 3614 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3615 sbi->s_journal = NULL;
3616 needs_recovery = 0;
3617 goto no_journal;
ac27a0ec
DK		 3618 }
3619
eb40a09c
JS		 3620 if (ext4_blocks_count(es) > 0xffffffffULL &&
3621 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3622 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3623 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3624 goto failed_mount_wq;
eb40a09c
JS		 3625 }
3626
d4da6c9c
LT		 3627 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3628 jbd2_journal_set_features(sbi->s_journal,
3629 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3630 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3631 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3632 jbd2_journal_set_features(sbi->s_journal,
3633 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3634 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3635 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3636 } else {
3637 jbd2_journal_clear_features(sbi->s_journal,
3638 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3639 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3640 }
818d276c 3641
ac27a0ec
DK		 3642 /* We have now updated the journal if required, so we can
3643 * validate the data journaling mode. */
3644 switch (test_opt(sb, DATA_FLAGS)) {
3645 case 0:
3646 /* No mode set, assume a default based on the journal
63f57933
AM		 3647 * capabilities: ORDERED_DATA if the journal can
3648 * cope, else JOURNAL_DATA
3649 */
dab291af
MC		 3650 if (jbd2_journal_check_available_features
3651 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3652 set_opt(sb, ORDERED_DATA);
ac27a0ec 3653 else
fd8c37ec 3654 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3655 break;
3656
617ba13b
MC		 3657 case EXT4_MOUNT_ORDERED_DATA:
3658 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3659 if (!jbd2_journal_check_available_features
3660 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3661 ext4_msg(sb, KERN_ERR, "Journal does not support "
3662 "requested data journaling mode");
744692dc 3663 goto failed_mount_wq;
ac27a0ec
DK		 3664 }
3665 default:
3666 break;
3667 }
b3881f74 3668 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3669
18aadd47
BJ		 3670 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3671
ce7e010a
TT		 3672 /*
3673 * The journal may have updated the bg summary counts, so we
3674 * need to update the global counters.
3675 */
57042651 3676 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3677 ext4_count_free_clusters(sb));
ce7e010a
TT		 3678 percpu_counter_set(&sbi->s_freeinodes_counter,
3679 ext4_count_free_inodes(sb));
3680 percpu_counter_set(&sbi->s_dirs_counter,
3681 ext4_count_dirs(sb));
57042651 3682 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3683
ce7e010a 3684no_journal:
fd89d5f2
TH		 3685 /*
3686 * The maximum number of concurrent works can be high and
3687 * concurrency isn't really necessary. Limit it to 1.
3688 */
3689 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3690 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3691 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3692 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3693 goto failed_mount_wq;
3694 }
3695
ac27a0ec 3696 /*
dab291af 3697 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3698 * so we can safely mount the rest of the filesystem now.
3699 */
3700
1d1fe1ee
DH		 3701 root = ext4_iget(sb, EXT4_ROOT_INO);
3702 if (IS_ERR(root)) {
b31e1552 3703 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3704 ret = PTR_ERR(root);
32a9bb57 3705 root = NULL;
ac27a0ec
DK		 3706 goto failed_mount4;
3707 }
3708 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3709 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3710 iput(root);
ac27a0ec
DK		 3711 goto failed_mount4;
3712 }
1d1fe1ee
DH		 3713 sb->s_root = d_alloc_root(root);
3714 if (!sb->s_root) {
94bf608a 3715 iput(root);
b31e1552 3716 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3717 ret = -ENOMEM;
3718 goto failed_mount4;
3719 }
ac27a0ec 3720
2b2d6d01 3721 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3722
3723 /* determine the minimum size of new large inodes, if present */
3724 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3725 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3726 EXT4_GOOD_OLD_INODE_SIZE;
3727 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3728 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3729 if (sbi->s_want_extra_isize <
3730 le16_to_cpu(es->s_want_extra_isize))
3731 sbi->s_want_extra_isize =
3732 le16_to_cpu(es->s_want_extra_isize);
3733 if (sbi->s_want_extra_isize <
3734 le16_to_cpu(es->s_min_extra_isize))
3735 sbi->s_want_extra_isize =
3736 le16_to_cpu(es->s_min_extra_isize);
3737 }
3738 }
3739 /* Check if enough inode space is available */
3740 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3741 sbi->s_inode_size) {
3742 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3743 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3744 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3745 "available");
ef7f3835
KS		 3746 }
3747
6fd058f7
TT		 3748 err = ext4_setup_system_zone(sb);
3749 if (err) {
b31e1552 3750 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3751 "zone (%d)", err);
94bf608a 3752 goto failed_mount4a;
6fd058f7
TT		 3753 }
3754
c2774d84
AK		 3755 ext4_ext_init(sb);
3756 err = ext4_mb_init(sb, needs_recovery);
3757 if (err) {
421f91d2 3758 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3759 err);
dcf2d804 3760 goto failed_mount5;
c2774d84
AK		 3761 }
3762
bfff6873
LC		 3763 err = ext4_register_li_request(sb, first_not_zeroed);
3764 if (err)
dcf2d804 3765 goto failed_mount6;
bfff6873 3766
3197ebdb
TT		 3767 sbi->s_kobj.kset = ext4_kset;
3768 init_completion(&sbi->s_kobj_unregister);
3769 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3770 "%s", sb->s_id);
dcf2d804
TM		 3771 if (err)
3772 goto failed_mount7;
3197ebdb 3773
617ba13b
MC		 3774 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3775 ext4_orphan_cleanup(sb, es);
3776 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3777 if (needs_recovery) {
b31e1552 3778 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3779 ext4_mark_recovery_complete(sb, es);
3780 }
3781 if (EXT4_SB(sb)->s_journal) {
3782 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3783 descr = " journalled data mode";
3784 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3785 descr = " ordered data mode";
3786 else
3787 descr = " writeback data mode";
3788 } else
3789 descr = "out journal";
3790
d4c402d9 3791 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3792 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3793 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3794
66e61a9e
TT		 3795 if (es->s_error_count)
3796 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3797
d4c402d9 3798 kfree(orig_data);
ac27a0ec
DK		 3799 return 0;
3800
617ba13b 3801cantfind_ext4:
ac27a0ec 3802 if (!silent)
b31e1552 3803 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3804 goto failed_mount;
3805
dcf2d804
TM		 3806failed_mount7:
3807 ext4_unregister_li_request(sb);
3808failed_mount6:
dcf2d804 3809 ext4_mb_release(sb);
94bf608a
AV		 3810failed_mount5:
3811 ext4_ext_release(sb);
dcf2d804 3812 ext4_release_system_zone(sb);
94bf608a
AV		 3813failed_mount4a:
3814 dput(sb->s_root);
32a9bb57 3815 sb->s_root = NULL;
94bf608a 3816failed_mount4:
b31e1552 3817 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3818 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3819failed_mount_wq:
0390131b
FM		 3820 if (sbi->s_journal) {
3821 jbd2_journal_destroy(sbi->s_journal);
3822 sbi->s_journal = NULL;
3823 }
ac27a0ec 3824failed_mount3:
04496411 3825 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3826 if (sbi->s_flex_groups)
3827 ext4_kvfree(sbi->s_flex_groups);
57042651 3828 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3829 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3830 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3831 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3832 if (sbi->s_mmp_tsk)
3833 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3834failed_mount2:
3835 for (i = 0; i < db_count; i++)
3836 brelse(sbi->s_group_desc[i]);
f18a5f21 3837 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3838failed_mount:
240799cd 3839 if (sbi->s_proc) {
9f6200bb 3840 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3841 }
ac27a0ec
DK		 3842#ifdef CONFIG_QUOTA
3843 for (i = 0; i < MAXQUOTAS; i++)
3844 kfree(sbi->s_qf_names[i]);
3845#endif
617ba13b 3846 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3847 brelse(bh);
3848out_fail:
3849 sb->s_fs_info = NULL;
f6830165 3850 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3851 kfree(sbi);
dcc7dae3 3852out_free_orig:
d4c402d9 3853 kfree(orig_data);
1d1fe1ee 3854 return ret;
ac27a0ec
DK		 3855}
3856
3857/*
3858 * Setup any per-fs journal parameters now. We'll do this both on
3859 * initial mount, once the journal has been initialised but before we've
3860 * done any recovery; and again on any subsequent remount.
3861 */
617ba13b 3862static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3863{
617ba13b 3864 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3865
30773840
TT		 3866 journal->j_commit_interval = sbi->s_commit_interval;
3867 journal->j_min_batch_time = sbi->s_min_batch_time;
3868 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3869
a931da6a 3870 write_lock(&journal->j_state_lock);
ac27a0ec 3871 if (test_opt(sb, BARRIER))
dab291af 3872 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3873 else
dab291af 3874 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3875 if (test_opt(sb, DATA_ERR_ABORT))
3876 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3877 else
3878 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3879 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3880}
3881
617ba13b 3882static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3883 unsigned int journal_inum)
3884{
3885 struct inode *journal_inode;
3886 journal_t *journal;
3887
0390131b
FM		 3888 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3889
ac27a0ec
DK		 3890 /* First, test for the existence of a valid inode on disk. Bad
3891 * things happen if we iget() an unused inode, as the subsequent
3892 * iput() will try to delete it. */
3893
1d1fe1ee
DH		 3894 journal_inode = ext4_iget(sb, journal_inum);
3895 if (IS_ERR(journal_inode)) {
b31e1552 3896 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3897 return NULL;
3898 }
3899 if (!journal_inode->i_nlink) {
3900 make_bad_inode(journal_inode);
3901 iput(journal_inode);
b31e1552 3902 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3903 return NULL;
3904 }
3905
e5f8eab8 3906 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3907 journal_inode, journal_inode->i_size);
1d1fe1ee 3908 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3909 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3910 iput(journal_inode);
3911 return NULL;
3912 }
3913
dab291af 3914 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3915 if (!journal) {
b31e1552 3916 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3917 iput(journal_inode);
3918 return NULL;
3919 }
3920 journal->j_private = sb;
617ba13b 3921 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3922 return journal;
3923}
3924
617ba13b 3925static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3926 dev_t j_dev)
3927{
2b2d6d01 3928 struct buffer_head *bh;
ac27a0ec 3929 journal_t *journal;
617ba13b
MC		 3930 ext4_fsblk_t start;
3931 ext4_fsblk_t len;
ac27a0ec 3932 int hblock, blocksize;
617ba13b 3933 ext4_fsblk_t sb_block;
ac27a0ec 3934 unsigned long offset;
2b2d6d01 3935 struct ext4_super_block *es;
ac27a0ec
DK		 3936 struct block_device *bdev;
3937
0390131b
FM		 3938 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3939
b31e1552 3940 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3941 if (bdev == NULL)
3942 return NULL;
3943
ac27a0ec 3944 blocksize = sb->s_blocksize;
e1defc4f 3945 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3946 if (blocksize < hblock) {
b31e1552
ES		 3947 ext4_msg(sb, KERN_ERR,
3948 "blocksize too small for journal device");
ac27a0ec
DK		 3949 goto out_bdev;
3950 }
3951
617ba13b
MC		 3952 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3953 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3954 set_blocksize(bdev, blocksize);
3955 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3956 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3957 "external journal");
ac27a0ec
DK		 3958 goto out_bdev;
3959 }
3960
617ba13b
MC		 3961 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3962 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3963 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3964 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3965 ext4_msg(sb, KERN_ERR, "external journal has "
3966 "bad superblock");
ac27a0ec
DK		 3967 brelse(bh);
3968 goto out_bdev;
3969 }
3970
617ba13b 3971 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3972 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3973 brelse(bh);
3974 goto out_bdev;
3975 }
3976
bd81d8ee 3977 len = ext4_blocks_count(es);
ac27a0ec
DK		 3978 start = sb_block + 1;
3979 brelse(bh); /* we're done with the superblock */
3980
dab291af 3981 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3982 start, len, blocksize);
3983 if (!journal) {
b31e1552 3984 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3985 goto out_bdev;
3986 }
3987 journal->j_private = sb;
3988 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3989 wait_on_buffer(journal->j_sb_buffer);
3990 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3991 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3992 goto out_journal;
3993 }
3994 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3995 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3996 "user (unsupported) - %d",
ac27a0ec
DK		 3997 be32_to_cpu(journal->j_superblock->s_nr_users));
3998 goto out_journal;
3999 }
617ba13b
MC		 4000 EXT4_SB(sb)->journal_bdev = bdev;
4001 ext4_init_journal_params(sb, journal);
ac27a0ec 4002 return journal;
0b8e58a1 4003
ac27a0ec 4004out_journal:
dab291af 4005 jbd2_journal_destroy(journal);
ac27a0ec 4006out_bdev:
617ba13b 4007 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4008 return NULL;
4009}
4010
617ba13b
MC		 4011static int ext4_load_journal(struct super_block *sb,
4012 struct ext4_super_block *es,
ac27a0ec
DK		 4013 unsigned long journal_devnum)
4014{
4015 journal_t *journal;
4016 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4017 dev_t journal_dev;
4018 int err = 0;
4019 int really_read_only;
4020
0390131b
FM		 4021 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4022
ac27a0ec
DK		 4023 if (journal_devnum &&
4024 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4025 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4026 "numbers have changed");
ac27a0ec
DK		 4027 journal_dev = new_decode_dev(journal_devnum);
4028 } else
4029 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4030
4031 really_read_only = bdev_read_only(sb->s_bdev);
4032
4033 /*
4034 * Are we loading a blank journal or performing recovery after a
4035 * crash? For recovery, we need to check in advance whether we
4036 * can get read-write access to the device.
4037 */
617ba13b 4038 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4039 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4040 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4041 "required on readonly filesystem");
ac27a0ec 4042 if (really_read_only) {
b31e1552
ES		 4043 ext4_msg(sb, KERN_ERR, "write access "
4044 "unavailable, cannot proceed");
ac27a0ec
DK		 4045 return -EROFS;
4046 }
b31e1552
ES		 4047 ext4_msg(sb, KERN_INFO, "write access will "
4048 "be enabled during recovery");
ac27a0ec
DK		 4049 }
4050 }
4051
4052 if (journal_inum && journal_dev) {
b31e1552
ES		 4053 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4054 "and inode journals!");
ac27a0ec
DK		 4055 return -EINVAL;
4056 }
4057
4058 if (journal_inum) {
617ba13b 4059 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4060 return -EINVAL;
4061 } else {
617ba13b 4062 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4063 return -EINVAL;
4064 }
4065
90576c0b 4066 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4067 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4068
617ba13b 4069 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4070 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4071 if (!err) {
4072 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4073 if (save)
4074 memcpy(save, ((char *) es) +
4075 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4076 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4077 if (save)
4078 memcpy(((char *) es) + EXT4_S_ERR_START,
4079 save, EXT4_S_ERR_LEN);
4080 kfree(save);
4081 }
ac27a0ec
DK		 4082
4083 if (err) {
b31e1552 4084 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4085 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4086 return err;
4087 }
4088
617ba13b
MC		 4089 EXT4_SB(sb)->s_journal = journal;
4090 ext4_clear_journal_err(sb, es);
ac27a0ec 4091
c41303ce 4092 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4093 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4094 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4095
4096 /* Make sure we flush the recovery flag to disk. */
e2d67052 4097 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4098 }
4099
4100 return 0;
4101}
4102
e2d67052 4103static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4104{
e2d67052 4105 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4106 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4107 int error = 0;
ac27a0ec 4108
7c2e7087 4109 if (!sbh || block_device_ejected(sb))
c4be0c1d 4110 return error;
914258bf
TT		 4111 if (buffer_write_io_error(sbh)) {
4112 /*
4113 * Oh, dear. A previous attempt to write the
4114 * superblock failed. This could happen because the
4115 * USB device was yanked out. Or it could happen to
4116 * be a transient write error and maybe the block will
4117 * be remapped. Nothing we can do but to retry the
4118 * write and hope for the best.
4119 */
b31e1552
ES		 4120 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4121 "superblock detected");
914258bf
TT		 4122 clear_buffer_write_io_error(sbh);
4123 set_buffer_uptodate(sbh);
4124 }
71290b36
TT		 4125 /*
4126 * If the file system is mounted read-only, don't update the
4127 * superblock write time. This avoids updating the superblock
4128 * write time when we are mounting the root file system
4129 * read/only but we need to replay the journal; at that point,
4130 * for people who are east of GMT and who make their clock
4131 * tick in localtime for Windows bug-for-bug compatibility,
4132 * the clock is set in the future, and this will cause e2fsck
4133 * to complain and force a full file system check.
4134 */
4135 if (!(sb->s_flags & MS_RDONLY))
4136 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4137 if (sb->s_bdev->bd_part)
4138 es->s_kbytes_written =
4139 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4140 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4141 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4142 else
4143 es->s_kbytes_written =
4144 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4145 ext4_free_blocks_count_set(es,
4146 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4147 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4148 es->s_free_inodes_count =
4149 cpu_to_le32(percpu_counter_sum_positive(
4150 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4151 sb->s_dirt = 0;
ac27a0ec
DK		 4152 BUFFER_TRACE(sbh, "marking dirty");
4153 mark_buffer_dirty(sbh);
914258bf 4154 if (sync) {
c4be0c1d
TS		 4155 error = sync_dirty_buffer(sbh);
4156 if (error)
4157 return error;
4158
4159 error = buffer_write_io_error(sbh);
4160 if (error) {
b31e1552
ES		 4161 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4162 "superblock");
914258bf
TT		 4163 clear_buffer_write_io_error(sbh);
4164 set_buffer_uptodate(sbh);
4165 }
4166 }
c4be0c1d 4167 return error;
ac27a0ec
DK		 4168}
4169
ac27a0ec
DK		 4170/*
4171 * Have we just finished recovery? If so, and if we are mounting (or
4172 * remounting) the filesystem readonly, then we will end up with a
4173 * consistent fs on disk. Record that fact.
4174 */
2b2d6d01
TT		 4175static void ext4_mark_recovery_complete(struct super_block *sb,
4176 struct ext4_super_block *es)
ac27a0ec 4177{
617ba13b 4178 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4179
0390131b
FM		 4180 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4181 BUG_ON(journal != NULL);
4182 return;
4183 }
dab291af 4184 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4185 if (jbd2_journal_flush(journal) < 0)
4186 goto out;
4187
617ba13b 4188 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4189 sb->s_flags & MS_RDONLY) {
617ba13b 4190 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4191 ext4_commit_super(sb, 1);
ac27a0ec 4192 }
7ffe1ea8
HK		 4193
4194out:
dab291af 4195 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4196}
4197
4198/*
4199 * If we are mounting (or read-write remounting) a filesystem whose journal
4200 * has recorded an error from a previous lifetime, move that error to the
4201 * main filesystem now.
4202 */
2b2d6d01
TT		 4203static void ext4_clear_journal_err(struct super_block *sb,
4204 struct ext4_super_block *es)
ac27a0ec
DK		 4205{
4206 journal_t *journal;
4207 int j_errno;
4208 const char *errstr;
4209
0390131b
FM		 4210 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4211
617ba13b 4212 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4213
4214 /*
4215 * Now check for any error status which may have been recorded in the
617ba13b 4216 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4217 */
4218
dab291af 4219 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4220 if (j_errno) {
4221 char nbuf[16];
4222
617ba13b 4223 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4224 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4225 "from previous mount: %s", errstr);
12062ddd 4226 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4227
617ba13b
MC		 4228 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4229 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4230 ext4_commit_super(sb, 1);
ac27a0ec 4231
dab291af 4232 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4233 }
4234}
4235
4236/*
4237 * Force the running and committing transactions to commit,
4238 * and wait on the commit.
4239 */
617ba13b 4240int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4241{
4242 journal_t *journal;
0390131b 4243 int ret = 0;
ac27a0ec
DK		 4244
4245 if (sb->s_flags & MS_RDONLY)
4246 return 0;
4247
617ba13b 4248 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4249 if (journal) {
437f88cc 4250 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4251 ret = ext4_journal_force_commit(journal);
6b0310fb 4252 }
0390131b 4253
ac27a0ec
DK		 4254 return ret;
4255}
4256
2b2d6d01 4257static void ext4_write_super(struct super_block *sb)
ac27a0ec 4258{
ebc1ac16 4259 lock_super(sb);
9ca92389 4260 ext4_commit_super(sb, 1);
ebc1ac16 4261 unlock_super(sb);
ac27a0ec
DK		 4262}
4263
617ba13b 4264static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4265{
14ce0cb4 4266 int ret = 0;
9eddacf9 4267 tid_t target;
8d5d02e6 4268 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4269
9bffad1e 4270 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4271 flush_workqueue(sbi->dio_unwritten_wq);
4272 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4273 if (wait)
8d5d02e6 4274 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4275 }
14ce0cb4 4276 return ret;
ac27a0ec
DK		 4277}
4278
4279/*
4280 * LVM calls this function before a (read-only) snapshot is created. This
4281 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4282 *
4283 * Note that only this function cannot bring a filesystem to be in a clean
4284 * state independently, because ext4 prevents a new handle from being started
4285 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4286 * the upper layer.
ac27a0ec 4287 */
c4be0c1d 4288static int ext4_freeze(struct super_block *sb)
ac27a0ec 4289{
c4be0c1d
TS		 4290 int error = 0;
4291 journal_t *journal;
ac27a0ec 4292
9ca92389
TT		 4293 if (sb->s_flags & MS_RDONLY)
4294 return 0;
ac27a0ec 4295
9ca92389 4296 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4297
9ca92389
TT		 4298 /* Now we set up the journal barrier. */
4299 jbd2_journal_lock_updates(journal);
ac27a0ec 4300
9ca92389
TT		 4301 /*
4302 * Don't clear the needs_recovery flag if we failed to flush
4303 * the journal.
4304 */
4305 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4306 if (error < 0)
4307 goto out;
9ca92389
TT		 4308
4309 /* Journal blocked and flushed, clear needs_recovery flag. */
4310 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4311 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4312out:
4313 /* we rely on s_frozen to stop further updates */
4314 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4315 return error;
ac27a0ec
DK		 4316}
4317
4318/*
4319 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4320 * flag here, even though the filesystem is not technically dirty yet.
4321 */
c4be0c1d 4322static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4323{
9ca92389
TT		 4324 if (sb->s_flags & MS_RDONLY)
4325 return 0;
4326
4327 lock_super(sb);
4328 /* Reset the needs_recovery flag before the fs is unlocked. */
4329 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4330 ext4_commit_super(sb, 1);
4331 unlock_super(sb);
c4be0c1d 4332 return 0;
ac27a0ec
DK		 4333}
4334
673c6100
TT		 4335/*
4336 * Structure to save mount options for ext4_remount's benefit
4337 */
4338struct ext4_mount_options {
4339 unsigned long s_mount_opt;
a2595b8a 4340 unsigned long s_mount_opt2;
673c6100
TT		 4341 uid_t s_resuid;
4342 gid_t s_resgid;
4343 unsigned long s_commit_interval;
4344 u32 s_min_batch_time, s_max_batch_time;
4345#ifdef CONFIG_QUOTA
4346 int s_jquota_fmt;
4347 char *s_qf_names[MAXQUOTAS];
4348#endif
4349};
4350
2b2d6d01 4351static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4352{
2b2d6d01 4353 struct ext4_super_block *es;
617ba13b 4354 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4355 unsigned long old_sb_flags;
617ba13b 4356 struct ext4_mount_options old_opts;
c79d967d 4357 int enable_quota = 0;
8a266467 4358 ext4_group_t g;
b3881f74 4359 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4360 int err = 0;
ac27a0ec
DK		 4361#ifdef CONFIG_QUOTA
4362 int i;
4363#endif
d4c402d9 4364 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4365
4366 /* Store the original options */
bbd6851a 4367 lock_super(sb);
ac27a0ec
DK		 4368 old_sb_flags = sb->s_flags;
4369 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4370 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4371 old_opts.s_resuid = sbi->s_resuid;
4372 old_opts.s_resgid = sbi->s_resgid;
4373 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4374 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4375 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4376#ifdef CONFIG_QUOTA
4377 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4378 for (i = 0; i < MAXQUOTAS; i++)
4379 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4380#endif
b3881f74
TT		 4381 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4382 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4383
4384 /*
4385 * Allow the "check" option to be passed as a remount option.
4386 */
661aa520 4387 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4388 err = -EINVAL;
4389 goto restore_opts;
4390 }
4391
4ab2f15b 4392 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4393 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4394
4395 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4396 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4397
4398 es = sbi->s_es;
4399
b3881f74 4400 if (sbi->s_journal) {
0390131b 4401 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4402 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4403 }
ac27a0ec 4404
661aa520 4405 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4406 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4407 err = -EROFS;
4408 goto restore_opts;
4409 }
4410
4411 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4412 err = dquot_suspend(sb, -1);
4413 if (err < 0)
c79d967d 4414 goto restore_opts;
c79d967d 4415
ac27a0ec
DK		 4416 /*
4417 * First of all, the unconditional stuff we have to do
4418 * to disable replay of the journal when we next remount
4419 */
4420 sb->s_flags |= MS_RDONLY;
4421
4422 /*
4423 * OK, test if we are remounting a valid rw partition
4424 * readonly, and if so set the rdonly flag and then
4425 * mark the partition as valid again.
4426 */
617ba13b
MC		 4427 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4428 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4429 es->s_state = cpu_to_le16(sbi->s_mount_state);
4430
a63c9eb2 4431 if (sbi->s_journal)
0390131b 4432 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4433 } else {
a13fb1a4
ES		 4434 /* Make sure we can mount this feature set readwrite */
4435 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4436 err = -EROFS;
4437 goto restore_opts;
4438 }
8a266467
TT		 4439 /*
4440 * Make sure the group descriptor checksums
0b8e58a1 4441 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4442 */
4443 for (g = 0; g < sbi->s_groups_count; g++) {
4444 struct ext4_group_desc *gdp =
4445 ext4_get_group_desc(sb, g, NULL);
4446
4447 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4448 ext4_msg(sb, KERN_ERR,
4449 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4450 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4451 le16_to_cpu(gdp->bg_checksum));
4452 err = -EINVAL;
4453 goto restore_opts;
4454 }
4455 }
4456
ead6596b
ES		 4457 /*
4458 * If we have an unprocessed orphan list hanging
4459 * around from a previously readonly bdev mount,
4460 * require a full umount/remount for now.
4461 */
4462 if (es->s_last_orphan) {
b31e1552 4463 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4464 "remount RDWR because of unprocessed "
4465 "orphan inode list. Please "
b31e1552 4466 "umount/remount instead");
ead6596b
ES		 4467 err = -EINVAL;
4468 goto restore_opts;
4469 }
4470
ac27a0ec
DK		 4471 /*
4472 * Mounting a RDONLY partition read-write, so reread
4473 * and store the current valid flag. (It may have
4474 * been changed by e2fsck since we originally mounted
4475 * the partition.)
4476 */
0390131b
FM		 4477 if (sbi->s_journal)
4478 ext4_clear_journal_err(sb, es);
ac27a0ec 4479 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4480 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4481 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4482 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4483 EXT4_FEATURE_INCOMPAT_MMP))
4484 if (ext4_multi_mount_protect(sb,
4485 le64_to_cpu(es->s_mmp_block))) {
4486 err = -EROFS;
4487 goto restore_opts;
4488 }
c79d967d 4489 enable_quota = 1;
ac27a0ec
DK		 4490 }
4491 }
bfff6873
LC		 4492
4493 /*
4494 * Reinitialize lazy itable initialization thread based on
4495 * current settings
4496 */
4497 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4498 ext4_unregister_li_request(sb);
4499 else {
4500 ext4_group_t first_not_zeroed;
4501 first_not_zeroed = ext4_has_uninit_itable(sb);
4502 ext4_register_li_request(sb, first_not_zeroed);
4503 }
4504
6fd058f7 4505 ext4_setup_system_zone(sb);
0390131b 4506 if (sbi->s_journal == NULL)
e2d67052 4507 ext4_commit_super(sb, 1);
0390131b 4508
ac27a0ec
DK		 4509#ifdef CONFIG_QUOTA
4510 /* Release old quota file names */
4511 for (i = 0; i < MAXQUOTAS; i++)
4512 if (old_opts.s_qf_names[i] &&
4513 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4514 kfree(old_opts.s_qf_names[i]);
4515#endif
bbd6851a 4516 unlock_super(sb);
c79d967d 4517 if (enable_quota)
0f0dd62f 4518 dquot_resume(sb, -1);
d4c402d9
CW		 4519
4520 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4521 kfree(orig_data);
ac27a0ec 4522 return 0;
0b8e58a1 4523
ac27a0ec
DK		 4524restore_opts:
4525 sb->s_flags = old_sb_flags;
4526 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4527 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4528 sbi->s_resuid = old_opts.s_resuid;
4529 sbi->s_resgid = old_opts.s_resgid;
4530 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4531 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4532 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4533#ifdef CONFIG_QUOTA
4534 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4535 for (i = 0; i < MAXQUOTAS; i++) {
4536 if (sbi->s_qf_names[i] &&
4537 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4538 kfree(sbi->s_qf_names[i]);
4539 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4540 }
4541#endif
bbd6851a 4542 unlock_super(sb);
d4c402d9 4543 kfree(orig_data);
ac27a0ec
DK		 4544 return err;
4545}
4546
f975d6bc
TT		 4547/*
4548 * Note: calculating the overhead so we can be compatible with
4549 * historical BSD practice is quite difficult in the face of
4550 * clusters/bigalloc. This is because multiple metadata blocks from
4551 * different block group can end up in the same allocation cluster.
4552 * Calculating the exact overhead in the face of clustered allocation
4553 * requires either O(all block bitmaps) in memory or O(number of block
4554 * groups**2) in time. We will still calculate the superblock for
4555 * older file systems --- and if we come across with a bigalloc file
4556 * system with zero in s_overhead_clusters the estimate will be close to
4557 * correct especially for very large cluster sizes --- but for newer
4558 * file systems, it's better to calculate this figure once at mkfs
4559 * time, and store it in the superblock. If the superblock value is
4560 * present (even for non-bigalloc file systems), we will use it.
4561 */
2b2d6d01 4562static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4563{
4564 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4565 struct ext4_sb_info *sbi = EXT4_SB(sb);
4566 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4567 struct ext4_group_desc *gdp;
960cc398 4568 u64 fsid;
d02a9391 4569 s64 bfree;
ac27a0ec 4570
5e70030d
BP		 4571 if (test_opt(sb, MINIX_DF)) {
4572 sbi->s_overhead_last = 0;
f975d6bc
TT		 4573 } else if (es->s_overhead_clusters) {
4574 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4575 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4576 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4577 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4578
4579 /*
5e70030d
BP		 4580 * Compute the overhead (FS structures). This is constant
4581 * for a given filesystem unless the number of block groups
4582 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4583 */
4584
4585 /*
4586 * All of the blocks before first_data_block are
4587 * overhead
4588 */
f975d6bc 4589 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4590
4591 /*
f975d6bc 4592 * Add the overhead found in each block group
ac27a0ec
DK		 4593 */
4594 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4595 gdp = ext4_get_group_desc(sb, i, NULL);
4596 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4597 cond_resched();
4598 }
5e70030d
BP		 4599 sbi->s_overhead_last = overhead;
4600 smp_wmb();
6bc9feff 4601 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4602 }
4603
617ba13b 4604 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4605 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4606 buf->f_blocks = (ext4_blocks_count(es) -
4607 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4608 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4609 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4610 /* prevent underflow in case that few free space is available */
57042651 4611 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4612 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4613 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4614 buf->f_bavail = 0;
4615 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4616 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4617 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4618 fsid = le64_to_cpup((void *)es->s_uuid) ^
4619 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4620 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4621 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4622
ac27a0ec
DK		 4623 return 0;
4624}
4625
0b8e58a1
AD		 4626/* Helper function for writing quotas on sync - we need to start transaction
4627 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4628 * Process 1 Process 2
617ba13b 4629 * ext4_create() quota_sync()
a269eb18 4630 * jbd2_journal_start() write_dquot()
871a2931 4631 * dquot_initialize() down(dqio_mutex)
dab291af 4632 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4633 *
4634 */
4635
4636#ifdef CONFIG_QUOTA
4637
4638static inline struct inode *dquot_to_inode(struct dquot *dquot)
4639{
4640 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4641}
4642
617ba13b 4643static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4644{
4645 int ret, err;
4646 handle_t *handle;
4647 struct inode *inode;
4648
4649 inode = dquot_to_inode(dquot);
617ba13b 4650 handle = ext4_journal_start(inode,
0b8e58a1 4651 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4652 if (IS_ERR(handle))
4653 return PTR_ERR(handle);
4654 ret = dquot_commit(dquot);
617ba13b 4655 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4656 if (!ret)
4657 ret = err;
4658 return ret;
4659}
4660
617ba13b 4661static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4662{
4663 int ret, err;
4664 handle_t *handle;
4665
617ba13b 4666 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4667 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4668 if (IS_ERR(handle))
4669 return PTR_ERR(handle);
4670 ret = dquot_acquire(dquot);
617ba13b 4671 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4672 if (!ret)
4673 ret = err;
4674 return ret;
4675}
4676
617ba13b 4677static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4678{
4679 int ret, err;
4680 handle_t *handle;
4681
617ba13b 4682 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4683 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4684 if (IS_ERR(handle)) {
4685 /* Release dquot anyway to avoid endless cycle in dqput() */
4686 dquot_release(dquot);
ac27a0ec 4687 return PTR_ERR(handle);
9c3013e9 4688 }
ac27a0ec 4689 ret = dquot_release(dquot);
617ba13b 4690 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4691 if (!ret)
4692 ret = err;
4693 return ret;
4694}
4695
617ba13b 4696static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4697{
2c8be6b2 4698 /* Are we journaling quotas? */
617ba13b
MC		 4699 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4700 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4701 dquot_mark_dquot_dirty(dquot);
617ba13b 4702 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4703 } else {
4704 return dquot_mark_dquot_dirty(dquot);
4705 }
4706}
4707
617ba13b 4708static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4709{
4710 int ret, err;
4711 handle_t *handle;
4712
4713 /* Data block + inode block */
617ba13b 4714 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4715 if (IS_ERR(handle))
4716 return PTR_ERR(handle);
4717 ret = dquot_commit_info(sb, type);
617ba13b 4718 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4719 if (!ret)
4720 ret = err;
4721 return ret;
4722}
4723
4724/*
4725 * Turn on quotas during mount time - we need to find
4726 * the quota file and such...
4727 */
617ba13b 4728static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4729{
287a8095
CH		 4730 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4731 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4732}
4733
4734/*
4735 * Standard function to be called on quota_on
4736 */
617ba13b 4737static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4738 struct path *path)
ac27a0ec
DK		 4739{
4740 int err;
ac27a0ec
DK		 4741
4742 if (!test_opt(sb, QUOTA))
4743 return -EINVAL;
0623543b 4744
ac27a0ec 4745 /* Quotafile not on the same filesystem? */
d8c9584e 4746 if (path->dentry->d_sb != sb)
ac27a0ec 4747 return -EXDEV;
0623543b
JK		 4748 /* Journaling quota? */
4749 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4750 /* Quotafile not in fs root? */
f00c9e44 4751 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4752 ext4_msg(sb, KERN_WARNING,
4753 "Quota file not on filesystem root. "
4754 "Journaled quota will not work");
2b2d6d01 4755 }
0623543b
JK		 4756
4757 /*
4758 * When we journal data on quota file, we have to flush journal to see
4759 * all updates to the file when we bypass pagecache...
4760 */
0390131b 4761 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4762 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4763 /*
4764 * We don't need to lock updates but journal_flush() could
4765 * otherwise be livelocked...
4766 */
4767 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4768 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4769 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4770 if (err)
7ffe1ea8 4771 return err;
0623543b
JK		 4772 }
4773
f00c9e44 4774 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4775}
4776
ca0e05e4
DM		 4777static int ext4_quota_off(struct super_block *sb, int type)
4778{
21f97697
JK		 4779 struct inode *inode = sb_dqopt(sb)->files[type];
4780 handle_t *handle;
4781
87009d86
DM		 4782 /* Force all delayed allocation blocks to be allocated.
4783 * Caller already holds s_umount sem */
4784 if (test_opt(sb, DELALLOC))
ca0e05e4 4785 sync_filesystem(sb);
ca0e05e4 4786
0b268590
AG		 4787 if (!inode)
4788 goto out;
4789
21f97697
JK		 4790 /* Update modification times of quota files when userspace can
4791 * start looking at them */
4792 handle = ext4_journal_start(inode, 1);
4793 if (IS_ERR(handle))
4794 goto out;
4795 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4796 ext4_mark_inode_dirty(handle, inode);
4797 ext4_journal_stop(handle);
4798
4799out:
ca0e05e4
DM		 4800 return dquot_quota_off(sb, type);
4801}
4802
ac27a0ec
DK		 4803/* Read data from quotafile - avoid pagecache and such because we cannot afford
4804 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4805 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4806 * we don't have to be afraid of races */
617ba13b 4807static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4808 size_t len, loff_t off)
4809{
4810 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4811 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4812 int err = 0;
4813 int offset = off & (sb->s_blocksize - 1);
4814 int tocopy;
4815 size_t toread;
4816 struct buffer_head *bh;
4817 loff_t i_size = i_size_read(inode);
4818
4819 if (off > i_size)
4820 return 0;
4821 if (off+len > i_size)
4822 len = i_size-off;
4823 toread = len;
4824 while (toread > 0) {
4825 tocopy = sb->s_blocksize - offset < toread ?
4826 sb->s_blocksize - offset : toread;
617ba13b 4827 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4828 if (err)
4829 return err;
4830 if (!bh) /* A hole? */
4831 memset(data, 0, tocopy);
4832 else
4833 memcpy(data, bh->b_data+offset, tocopy);
4834 brelse(bh);
4835 offset = 0;
4836 toread -= tocopy;
4837 data += tocopy;
4838 blk++;
4839 }
4840 return len;
4841}
4842
4843/* Write to quotafile (we know the transaction is already started and has
4844 * enough credits) */
617ba13b 4845static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4846 const char *data, size_t len, loff_t off)
4847{
4848 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4849 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4850 int err = 0;
4851 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4852 struct buffer_head *bh;
4853 handle_t *handle = journal_current_handle();
4854
0390131b 4855 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4856 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4857 " cancelled because transaction is not started",
9c3013e9
JK		 4858 (unsigned long long)off, (unsigned long long)len);
4859 return -EIO;
4860 }
67eeb568
DM		 4861 /*
4862 * Since we account only one data block in transaction credits,
4863 * then it is impossible to cross a block boundary.
4864 */
4865 if (sb->s_blocksize - offset < len) {
4866 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4867 " cancelled because not block aligned",
4868 (unsigned long long)off, (unsigned long long)len);
4869 return -EIO;
4870 }
4871
ac27a0ec 4872 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4873 bh = ext4_bread(handle, inode, blk, 1, &err);
4874 if (!bh)
4875 goto out;
62d2b5f2
JK		 4876 err = ext4_journal_get_write_access(handle, bh);
4877 if (err) {
4878 brelse(bh);
4879 goto out;
ac27a0ec 4880 }
67eeb568
DM		 4881 lock_buffer(bh);
4882 memcpy(bh->b_data+offset, data, len);
4883 flush_dcache_page(bh->b_page);
4884 unlock_buffer(bh);
62d2b5f2 4885 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4886 brelse(bh);
ac27a0ec 4887out:
67eeb568 4888 if (err) {
4d04e4fb 4889 mutex_unlock(&inode->i_mutex);
ac27a0ec 4890 return err;
4d04e4fb 4891 }
67eeb568
DM		 4892 if (inode->i_size < off + len) {
4893 i_size_write(inode, off + len);
617ba13b 4894 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4895 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4896 }
ac27a0ec 4897 mutex_unlock(&inode->i_mutex);
67eeb568 4898 return len;
ac27a0ec
DK		 4899}
4900
4901#endif
4902
152a0836
AV		 4903static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4904 const char *dev_name, void *data)
ac27a0ec 4905{
152a0836 4906 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4907}
4908
37f328eb 4909#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4910static inline void register_as_ext2(void)
4911{
4912 int err = register_filesystem(&ext2_fs_type);
4913 if (err)
4914 printk(KERN_WARNING
4915 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4916}
4917
4918static inline void unregister_as_ext2(void)
4919{
4920 unregister_filesystem(&ext2_fs_type);
4921}
2035e776
TT		 4922
4923static inline int ext2_feature_set_ok(struct super_block *sb)
4924{
4925 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4926 return 0;
4927 if (sb->s_flags & MS_RDONLY)
4928 return 1;
4929 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4930 return 0;
4931 return 1;
4932}
51b7e3c9 4933MODULE_ALIAS("ext2");
24b58424
TT		 4934#else
4935static inline void register_as_ext2(void) { }
4936static inline void unregister_as_ext2(void) { }
2035e776 4937static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4938#endif
4939
37f328eb 4940#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4941static inline void register_as_ext3(void)
4942{
4943 int err = register_filesystem(&ext3_fs_type);
4944 if (err)
4945 printk(KERN_WARNING
4946 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4947}
4948
4949static inline void unregister_as_ext3(void)
4950{
4951 unregister_filesystem(&ext3_fs_type);
4952}
2035e776
TT		 4953
4954static inline int ext3_feature_set_ok(struct super_block *sb)
4955{
4956 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4957 return 0;
4958 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4959 return 0;
4960 if (sb->s_flags & MS_RDONLY)
4961 return 1;
4962 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4963 return 0;
4964 return 1;
4965}
51b7e3c9 4966MODULE_ALIAS("ext3");
24b58424
TT		 4967#else
4968static inline void register_as_ext3(void) { }
4969static inline void unregister_as_ext3(void) { }
2035e776 4970static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4971#endif
4972
03010a33
TT		 4973static struct file_system_type ext4_fs_type = {
4974 .owner = THIS_MODULE,
4975 .name = "ext4",
152a0836 4976 .mount = ext4_mount,
03010a33
TT		 4977 .kill_sb = kill_block_super,
4978 .fs_flags = FS_REQUIRES_DEV,
4979};
4980
8f021222 4981static int __init ext4_init_feat_adverts(void)
857ac889
LC		 4982{
4983 struct ext4_features *ef;
4984 int ret = -ENOMEM;
4985
4986 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4987 if (!ef)
4988 goto out;
4989
4990 ef->f_kobj.kset = ext4_kset;
4991 init_completion(&ef->f_kobj_unregister);
4992 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4993 "features");
4994 if (ret) {
4995 kfree(ef);
4996 goto out;
4997 }
4998
4999 ext4_feat = ef;
5000 ret = 0;
5001out:
5002 return ret;
5003}
5004
8f021222
LC		 5005static void ext4_exit_feat_adverts(void)
5006{
5007 kobject_put(&ext4_feat->f_kobj);
5008 wait_for_completion(&ext4_feat->f_kobj_unregister);
5009 kfree(ext4_feat);
5010}
5011
e9e3bcec
ES		 5012/* Shared across all ext4 file systems */
5013wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5014struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5015
5dabfc78 5016static int __init ext4_init_fs(void)
ac27a0ec 5017{
e9e3bcec 5018 int i, err;
c9de560d 5019
12e9b892 5020 ext4_check_flag_values();
e9e3bcec
ES		 5021
5022 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5023 mutex_init(&ext4__aio_mutex[i]);
5024 init_waitqueue_head(&ext4__ioend_wq[i]);
5025 }
5026
5dabfc78 5027 err = ext4_init_pageio();
6fd058f7
TT		 5028 if (err)
5029 return err;
5dabfc78 5030 err = ext4_init_system_zone();
bd2d0210 5031 if (err)
d44651d0 5032 goto out6;
3197ebdb
TT		 5033 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5034 if (!ext4_kset)
dd68314c 5035 goto out5;
d44651d0 5036 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5037
5038 err = ext4_init_feat_adverts();
dd68314c
TT		 5039 if (err)
5040 goto out4;
857ac889 5041
5dabfc78 5042 err = ext4_init_mballoc();
ac27a0ec 5043 if (err)
6fd058f7 5044 goto out3;
c9de560d 5045
5dabfc78 5046 err = ext4_init_xattr();
c9de560d
AT		 5047 if (err)
5048 goto out2;
ac27a0ec
DK		 5049 err = init_inodecache();
5050 if (err)
5051 goto out1;
24b58424 5052 register_as_ext3();
2035e776 5053 register_as_ext2();
03010a33 5054 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5055 if (err)
5056 goto out;
bfff6873
LC		 5057
5058 ext4_li_info = NULL;
5059 mutex_init(&ext4_li_mtx);
ac27a0ec
DK		 5060 return 0;
5061out:
24b58424
TT		 5062 unregister_as_ext2();
5063 unregister_as_ext3();
ac27a0ec
DK		 5064 destroy_inodecache();
5065out1:
5dabfc78 5066 ext4_exit_xattr();
c9de560d 5067out2:
5dabfc78 5068 ext4_exit_mballoc();
6fd058f7 5069out3:
8f021222 5070 ext4_exit_feat_adverts();
dd68314c 5071out4:
d44651d0
FJ		 5072 if (ext4_proc_root)
5073 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5074 kset_unregister(ext4_kset);
d44651d0 5075out5:
5dabfc78 5076 ext4_exit_system_zone();
d44651d0 5077out6:
5dabfc78 5078 ext4_exit_pageio();
ac27a0ec
DK		 5079 return err;
5080}
5081
5dabfc78 5082static void __exit ext4_exit_fs(void)
ac27a0ec 5083{
bfff6873 5084 ext4_destroy_lazyinit_thread();
24b58424
TT		 5085 unregister_as_ext2();
5086 unregister_as_ext3();
03010a33 5087 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5088 destroy_inodecache();
5dabfc78
TT		 5089 ext4_exit_xattr();
5090 ext4_exit_mballoc();
8f021222 5091 ext4_exit_feat_adverts();
9f6200bb 5092 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5093 kset_unregister(ext4_kset);
5dabfc78
TT		 5094 ext4_exit_system_zone();
5095 ext4_exit_pageio();
ac27a0ec
DK		 5096}
5097
5098MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5099MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5100MODULE_LICENSE("GPL");
5dabfc78
TT		 5101module_init(ext4_init_fs)
5102module_exit(ext4_exit_fs)