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ext4: load the crc32c driver if necessary
[mirror_ubuntu-artful-kernel.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 77static void ext4_write_super(struct super_block *sb);
c4be0c1d 78static int ext4_freeze(struct super_block *sb);
152a0836
AV		 79static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
2035e776
TT		 81static inline int ext2_feature_set_ok(struct super_block *sb);
82static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 83static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 84static void ext4_destroy_lazyinit_thread(void);
85static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 86static void ext4_clear_request_list(void);
ac27a0ec 87
2035e776
TT		 88#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95};
96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
110#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111#else
112#define IS_EXT3_SB(sb) (0)
113#endif
bd81d8ee 114
d25425f8
DW		 115static int ext4_verify_csum_type(struct super_block *sb,
116 struct ext4_super_block *es)
117{
118 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
119 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
120 return 1;
121
122 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
123}
124
9933fc0a
TT		 125void *ext4_kvmalloc(size_t size, gfp_t flags)
126{
127 void *ret;
128
129 ret = kmalloc(size, flags);
130 if (!ret)
131 ret = __vmalloc(size, flags, PAGE_KERNEL);
132 return ret;
133}
134
135void *ext4_kvzalloc(size_t size, gfp_t flags)
136{
137 void *ret;
138
db9481c0 139 ret = kzalloc(size, flags);
9933fc0a
TT		 140 if (!ret)
141 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
142 return ret;
143}
144
145void ext4_kvfree(void *ptr)
146{
147 if (is_vmalloc_addr(ptr))
148 vfree(ptr);
149 else
150 kfree(ptr);
151
152}
153
8fadc143
AR		 154ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
155 struct ext4_group_desc *bg)
bd81d8ee 156{
3a14589c 157 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 158 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 159 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 160}
161
8fadc143
AR		 162ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
163 struct ext4_group_desc *bg)
bd81d8ee 164{
5272f837 165 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 166 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 167 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 168}
169
8fadc143
AR		 170ext4_fsblk_t ext4_inode_table(struct super_block *sb,
171 struct ext4_group_desc *bg)
bd81d8ee 172{
5272f837 173 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 174 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 175 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 176}
177
021b65bb
TT		 178__u32 ext4_free_group_clusters(struct super_block *sb,
179 struct ext4_group_desc *bg)
560671a0
AK		 180{
181 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
182 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 183 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 184}
185
186__u32 ext4_free_inodes_count(struct super_block *sb,
187 struct ext4_group_desc *bg)
188{
189 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 191 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 192}
193
194__u32 ext4_used_dirs_count(struct super_block *sb,
195 struct ext4_group_desc *bg)
196{
197 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 199 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 200}
201
202__u32 ext4_itable_unused_count(struct super_block *sb,
203 struct ext4_group_desc *bg)
204{
205 return le16_to_cpu(bg->bg_itable_unused_lo) |
206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 207 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 208}
209
8fadc143
AR		 210void ext4_block_bitmap_set(struct super_block *sb,
211 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 212{
3a14589c 213 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 214 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
215 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 216}
217
8fadc143
AR		 218void ext4_inode_bitmap_set(struct super_block *sb,
219 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 220{
5272f837 221 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 222 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
223 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 224}
225
8fadc143
AR		 226void ext4_inode_table_set(struct super_block *sb,
227 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 228{
5272f837 229 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 230 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
231 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 232}
233
021b65bb
TT		 234void ext4_free_group_clusters_set(struct super_block *sb,
235 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 236{
237 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
238 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
239 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
240}
241
242void ext4_free_inodes_set(struct super_block *sb,
243 struct ext4_group_desc *bg, __u32 count)
244{
245 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
248}
249
250void ext4_used_dirs_set(struct super_block *sb,
251 struct ext4_group_desc *bg, __u32 count)
252{
253 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
256}
257
258void ext4_itable_unused_set(struct super_block *sb,
259 struct ext4_group_desc *bg, __u32 count)
260{
261 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
264}
265
d3d1faf6
CW		 266
267/* Just increment the non-pointer handle value */
268static handle_t *ext4_get_nojournal(void)
269{
270 handle_t *handle = current->journal_info;
271 unsigned long ref_cnt = (unsigned long)handle;
272
273 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
274
275 ref_cnt++;
276 handle = (handle_t *)ref_cnt;
277
278 current->journal_info = handle;
279 return handle;
280}
281
282
283/* Decrement the non-pointer handle value */
284static void ext4_put_nojournal(handle_t *handle)
285{
286 unsigned long ref_cnt = (unsigned long)handle;
287
288 BUG_ON(ref_cnt == 0);
289
290 ref_cnt--;
291 handle = (handle_t *)ref_cnt;
292
293 current->journal_info = handle;
294}
295
ac27a0ec 296/*
dab291af 297 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 298 *
299 * The only special thing we need to do here is to make sure that all
300 * journal_end calls result in the superblock being marked dirty, so
301 * that sync() will call the filesystem's write_super callback if
302 * appropriate.
be4f27d3
YY		 303 *
304 * To avoid j_barrier hold in userspace when a user calls freeze(),
305 * ext4 prevents a new handle from being started by s_frozen, which
306 * is in an upper layer.
ac27a0ec 307 */
617ba13b 308handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 309{
310 journal_t *journal;
be4f27d3 311 handle_t *handle;
ac27a0ec 312
12706394 313 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 314 if (sb->s_flags & MS_RDONLY)
315 return ERR_PTR(-EROFS);
316
617ba13b 317 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 318 handle = ext4_journal_current_handle();
319
320 /*
321 * If a handle has been started, it should be allowed to
322 * finish, otherwise deadlock could happen between freeze
323 * and others(e.g. truncate) due to the restart of the
324 * journal handle if the filesystem is forzen and active
325 * handles are not stopped.
326 */
327 if (!handle)
328 vfs_check_frozen(sb, SB_FREEZE_TRANS);
329
330 if (!journal)
331 return ext4_get_nojournal();
332 /*
333 * Special case here: if the journal has aborted behind our
334 * backs (eg. EIO in the commit thread), then we still need to
335 * take the FS itself readonly cleanly.
336 */
337 if (is_journal_aborted(journal)) {
338 ext4_abort(sb, "Detected aborted journal");
339 return ERR_PTR(-EROFS);
ac27a0ec 340 }
be4f27d3 341 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 342}
343
344/*
345 * The only special thing we need to do here is to make sure that all
dab291af 346 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 347 * that sync() will call the filesystem's write_super callback if
348 * appropriate.
349 */
c398eda0 350int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 351{
352 struct super_block *sb;
353 int err;
354 int rc;
355
0390131b 356 if (!ext4_handle_valid(handle)) {
d3d1faf6 357 ext4_put_nojournal(handle);
0390131b
FM		 358 return 0;
359 }
ac27a0ec
DK		 360 sb = handle->h_transaction->t_journal->j_private;
361 err = handle->h_err;
dab291af 362 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 363
364 if (!err)
365 err = rc;
366 if (err)
c398eda0 367 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 368 return err;
369}
370
90c7201b
TT		 371void ext4_journal_abort_handle(const char *caller, unsigned int line,
372 const char *err_fn, struct buffer_head *bh,
373 handle_t *handle, int err)
ac27a0ec
DK		 374{
375 char nbuf[16];
617ba13b 376 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 377
0390131b
FM		 378 BUG_ON(!ext4_handle_valid(handle));
379
ac27a0ec
DK		 380 if (bh)
381 BUFFER_TRACE(bh, "abort");
382
383 if (!handle->h_err)
384 handle->h_err = err;
385
386 if (is_handle_aborted(handle))
387 return;
388
92b97816 389 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 390 caller, line, errstr, err_fn);
ac27a0ec 391
dab291af 392 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 393}
394
1c13d5c0
TT		 395static void __save_error_info(struct super_block *sb, const char *func,
396 unsigned int line)
397{
398 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
399
400 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
401 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
402 es->s_last_error_time = cpu_to_le32(get_seconds());
403 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
404 es->s_last_error_line = cpu_to_le32(line);
405 if (!es->s_first_error_time) {
406 es->s_first_error_time = es->s_last_error_time;
407 strncpy(es->s_first_error_func, func,
408 sizeof(es->s_first_error_func));
409 es->s_first_error_line = cpu_to_le32(line);
410 es->s_first_error_ino = es->s_last_error_ino;
411 es->s_first_error_block = es->s_last_error_block;
412 }
66e61a9e
TT		 413 /*
414 * Start the daily error reporting function if it hasn't been
415 * started already
416 */
417 if (!es->s_error_count)
418 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 419 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
420}
421
422static void save_error_info(struct super_block *sb, const char *func,
423 unsigned int line)
424{
425 __save_error_info(sb, func, line);
426 ext4_commit_super(sb, 1);
427}
428
7c2e7087
TT		 429/*
430 * The del_gendisk() function uninitializes the disk-specific data
431 * structures, including the bdi structure, without telling anyone
432 * else. Once this happens, any attempt to call mark_buffer_dirty()
433 * (for example, by ext4_commit_super), will cause a kernel OOPS.
434 * This is a kludge to prevent these oops until we can put in a proper
435 * hook in del_gendisk() to inform the VFS and file system layers.
436 */
437static int block_device_ejected(struct super_block *sb)
438{
439 struct inode *bd_inode = sb->s_bdev->bd_inode;
440 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
441
442 return bdi->dev == NULL;
443}
444
18aadd47
BJ		 445static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
446{
447 struct super_block *sb = journal->j_private;
448 struct ext4_sb_info *sbi = EXT4_SB(sb);
449 int error = is_journal_aborted(journal);
450 struct ext4_journal_cb_entry *jce, *tmp;
451
452 spin_lock(&sbi->s_md_lock);
453 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
454 list_del_init(&jce->jce_list);
455 spin_unlock(&sbi->s_md_lock);
456 jce->jce_func(sb, jce, error);
457 spin_lock(&sbi->s_md_lock);
458 }
459 spin_unlock(&sbi->s_md_lock);
460}
1c13d5c0 461
ac27a0ec
DK		 462/* Deal with the reporting of failure conditions on a filesystem such as
463 * inconsistencies detected or read IO failures.
464 *
465 * On ext2, we can store the error state of the filesystem in the
617ba13b 466 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 467 * write ordering constraints on the superblock which prevent us from
468 * writing it out straight away; and given that the journal is about to
469 * be aborted, we can't rely on the current, or future, transactions to
470 * write out the superblock safely.
471 *
dab291af 472 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 473 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 474 * that error until we've noted it down and cleared it.
475 */
476
617ba13b 477static void ext4_handle_error(struct super_block *sb)
ac27a0ec 478{
ac27a0ec
DK		 479 if (sb->s_flags & MS_RDONLY)
480 return;
481
2b2d6d01 482 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 483 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 484
4ab2f15b 485 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 486 if (journal)
dab291af 487 jbd2_journal_abort(journal, -EIO);
ac27a0ec 488 }
2b2d6d01 489 if (test_opt(sb, ERRORS_RO)) {
b31e1552 490 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 491 sb->s_flags |= MS_RDONLY;
492 }
ac27a0ec 493 if (test_opt(sb, ERRORS_PANIC))
617ba13b 494 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 495 sb->s_id);
496}
497
12062ddd 498void __ext4_error(struct super_block *sb, const char *function,
c398eda0 499 unsigned int line, const char *fmt, ...)
ac27a0ec 500{
0ff2ea7d 501 struct va_format vaf;
ac27a0ec
DK		 502 va_list args;
503
504 va_start(args, fmt);
0ff2ea7d
JP		 505 vaf.fmt = fmt;
506 vaf.va = &args;
507 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
508 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 509 va_end(args);
510
617ba13b 511 ext4_handle_error(sb);
ac27a0ec
DK		 512}
513
c398eda0
TT		 514void ext4_error_inode(struct inode *inode, const char *function,
515 unsigned int line, ext4_fsblk_t block,
273df556
FM		 516 const char *fmt, ...)
517{
518 va_list args;
f7c21177 519 struct va_format vaf;
1c13d5c0 520 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 521
1c13d5c0
TT		 522 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
523 es->s_last_error_block = cpu_to_le64(block);
524 save_error_info(inode->i_sb, function, line);
273df556 525 va_start(args, fmt);
f7c21177
TT		 526 vaf.fmt = fmt;
527 vaf.va = &args;
c398eda0 528 if (block)
d9ee81da
JP		 529 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
530 "inode #%lu: block %llu: comm %s: %pV\n",
531 inode->i_sb->s_id, function, line, inode->i_ino,
532 block, current->comm, &vaf);
533 else
534 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
535 "inode #%lu: comm %s: %pV\n",
536 inode->i_sb->s_id, function, line, inode->i_ino,
537 current->comm, &vaf);
273df556
FM		 538 va_end(args);
539
540 ext4_handle_error(inode->i_sb);
541}
542
c398eda0 543void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 544 unsigned int line, ext4_fsblk_t block,
545 const char *fmt, ...)
273df556
FM		 546{
547 va_list args;
f7c21177 548 struct va_format vaf;
1c13d5c0 549 struct ext4_super_block *es;
273df556
FM		 550 struct inode *inode = file->f_dentry->d_inode;
551 char pathname[80], *path;
552
1c13d5c0
TT		 553 es = EXT4_SB(inode->i_sb)->s_es;
554 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
555 save_error_info(inode->i_sb, function, line);
273df556 556 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 557 if (IS_ERR(path))
273df556 558 path = "(unknown)";
f7c21177
TT		 559 va_start(args, fmt);
560 vaf.fmt = fmt;
561 vaf.va = &args;
d9ee81da
JP		 562 if (block)
563 printk(KERN_CRIT
564 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
565 "block %llu: comm %s: path %s: %pV\n",
566 inode->i_sb->s_id, function, line, inode->i_ino,
567 block, current->comm, path, &vaf);
568 else
569 printk(KERN_CRIT
570 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
571 "comm %s: path %s: %pV\n",
572 inode->i_sb->s_id, function, line, inode->i_ino,
573 current->comm, path, &vaf);
273df556
FM		 574 va_end(args);
575
576 ext4_handle_error(inode->i_sb);
577}
578
2b2d6d01 579static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 580 char nbuf[16])
581{
582 char *errstr = NULL;
583
584 switch (errno) {
585 case -EIO:
586 errstr = "IO failure";
587 break;
588 case -ENOMEM:
589 errstr = "Out of memory";
590 break;
591 case -EROFS:
78f1ddbb
TT		 592 if (!sb || (EXT4_SB(sb)->s_journal &&
593 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 594 errstr = "Journal has aborted";
595 else
596 errstr = "Readonly filesystem";
597 break;
598 default:
599 /* If the caller passed in an extra buffer for unknown
600 * errors, textualise them now. Else we just return
601 * NULL. */
602 if (nbuf) {
603 /* Check for truncated error codes... */
604 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
605 errstr = nbuf;
606 }
607 break;
608 }
609
610 return errstr;
611}
612
617ba13b 613/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 614 * automatically and invokes the appropriate error response. */
615
c398eda0
TT		 616void __ext4_std_error(struct super_block *sb, const char *function,
617 unsigned int line, int errno)
ac27a0ec
DK		 618{
619 char nbuf[16];
620 const char *errstr;
621
622 /* Special case: if the error is EROFS, and we're not already
623 * inside a transaction, then there's really no point in logging
624 * an error. */
625 if (errno == -EROFS && journal_current_handle() == NULL &&
626 (sb->s_flags & MS_RDONLY))
627 return;
628
617ba13b 629 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 630 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
631 sb->s_id, function, line, errstr);
1c13d5c0 632 save_error_info(sb, function, line);
ac27a0ec 633
617ba13b 634 ext4_handle_error(sb);
ac27a0ec
DK		 635}
636
637/*
617ba13b 638 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 639 * abort function may be used to deal with unrecoverable failures such
640 * as journal IO errors or ENOMEM at a critical moment in log management.
641 *
642 * We unconditionally force the filesystem into an ABORT|READONLY state,
643 * unless the error response on the fs has been set to panic in which
644 * case we take the easy way out and panic immediately.
645 */
646
c67d859e 647void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 648 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 649{
650 va_list args;
651
1c13d5c0 652 save_error_info(sb, function, line);
ac27a0ec 653 va_start(args, fmt);
c398eda0
TT		 654 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
655 function, line);
ac27a0ec
DK		 656 vprintk(fmt, args);
657 printk("\n");
658 va_end(args);
659
1c13d5c0
TT		 660 if ((sb->s_flags & MS_RDONLY) == 0) {
661 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
662 sb->s_flags |= MS_RDONLY;
663 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
664 if (EXT4_SB(sb)->s_journal)
665 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
666 save_error_info(sb, function, line);
667 }
ac27a0ec 668 if (test_opt(sb, ERRORS_PANIC))
617ba13b 669 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 670}
671
0ff2ea7d 672void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 673{
0ff2ea7d 674 struct va_format vaf;
b31e1552
ES		 675 va_list args;
676
677 va_start(args, fmt);
0ff2ea7d
JP		 678 vaf.fmt = fmt;
679 vaf.va = &args;
680 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 681 va_end(args);
682}
683
12062ddd 684void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 685 unsigned int line, const char *fmt, ...)
ac27a0ec 686{
0ff2ea7d 687 struct va_format vaf;
ac27a0ec
DK		 688 va_list args;
689
690 va_start(args, fmt);
0ff2ea7d
JP		 691 vaf.fmt = fmt;
692 vaf.va = &args;
693 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
694 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 695 va_end(args);
696}
697
e29136f8
TT		 698void __ext4_grp_locked_error(const char *function, unsigned int line,
699 struct super_block *sb, ext4_group_t grp,
700 unsigned long ino, ext4_fsblk_t block,
701 const char *fmt, ...)
5d1b1b3f
AK		 702__releases(bitlock)
703__acquires(bitlock)
704{
0ff2ea7d 705 struct va_format vaf;
5d1b1b3f
AK		 706 va_list args;
707 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
708
1c13d5c0
TT		 709 es->s_last_error_ino = cpu_to_le32(ino);
710 es->s_last_error_block = cpu_to_le64(block);
711 __save_error_info(sb, function, line);
0ff2ea7d 712
5d1b1b3f 713 va_start(args, fmt);
0ff2ea7d
JP		 714
715 vaf.fmt = fmt;
716 vaf.va = &args;
21149d61 717 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 718 sb->s_id, function, line, grp);
719 if (ino)
0ff2ea7d 720 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 721 if (block)
0ff2ea7d
JP		 722 printk(KERN_CONT "block %llu:", (unsigned long long) block);
723 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 724 va_end(args);
725
726 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 727 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 728 return;
729 }
1c13d5c0 730
5d1b1b3f
AK		 731 ext4_unlock_group(sb, grp);
732 ext4_handle_error(sb);
733 /*
734 * We only get here in the ERRORS_RO case; relocking the group
735 * may be dangerous, but nothing bad will happen since the
736 * filesystem will have already been marked read/only and the
737 * journal has been aborted. We return 1 as a hint to callers
738 * who might what to use the return value from
25985edc 739 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 740 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
741 * aggressively from the ext4 function in question, with a
742 * more appropriate error code.
743 */
744 ext4_lock_group(sb, grp);
745 return;
746}
747
617ba13b 748void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 749{
617ba13b 750 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 751
617ba13b 752 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 753 return;
754
12062ddd 755 ext4_warning(sb,
ac27a0ec
DK		 756 "updating to rev %d because of new feature flag, "
757 "running e2fsck is recommended",
617ba13b 758 EXT4_DYNAMIC_REV);
ac27a0ec 759
617ba13b
MC		 760 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
761 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
762 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 763 /* leave es->s_feature_*compat flags alone */
764 /* es->s_uuid will be set by e2fsck if empty */
765
766 /*
767 * The rest of the superblock fields should be zero, and if not it
768 * means they are likely already in use, so leave them alone. We
769 * can leave it up to e2fsck to clean up any inconsistencies there.
770 */
771}
772
773/*
774 * Open the external journal device
775 */
b31e1552 776static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 777{
778 struct block_device *bdev;
779 char b[BDEVNAME_SIZE];
780
d4d77629 781 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 782 if (IS_ERR(bdev))
783 goto fail;
784 return bdev;
785
786fail:
b31e1552 787 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 788 __bdevname(dev, b), PTR_ERR(bdev));
789 return NULL;
790}
791
792/*
793 * Release the journal device
794 */
617ba13b 795static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 796{
e525fd89 797 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 798}
799
617ba13b 800static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 801{
802 struct block_device *bdev;
803 int ret = -ENODEV;
804
805 bdev = sbi->journal_bdev;
806 if (bdev) {
617ba13b 807 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 808 sbi->journal_bdev = NULL;
809 }
810 return ret;
811}
812
813static inline struct inode *orphan_list_entry(struct list_head *l)
814{
617ba13b 815 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 816}
817
617ba13b 818static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 819{
820 struct list_head *l;
821
b31e1552
ES		 822 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
823 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 824
825 printk(KERN_ERR "sb_info orphan list:\n");
826 list_for_each(l, &sbi->s_orphan) {
827 struct inode *inode = orphan_list_entry(l);
828 printk(KERN_ERR " "
829 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
830 inode->i_sb->s_id, inode->i_ino, inode,
831 inode->i_mode, inode->i_nlink,
832 NEXT_ORPHAN(inode));
833 }
834}
835
2b2d6d01 836static void ext4_put_super(struct super_block *sb)
ac27a0ec 837{
617ba13b
MC		 838 struct ext4_sb_info *sbi = EXT4_SB(sb);
839 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 840 int i, err;
ac27a0ec 841
857ac889 842 ext4_unregister_li_request(sb);
e0ccfd95
CH		 843 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
844
4c0425ff
MC		 845 flush_workqueue(sbi->dio_unwritten_wq);
846 destroy_workqueue(sbi->dio_unwritten_wq);
847
a9e220f8 848 lock_super(sb);
0390131b
FM		 849 if (sbi->s_journal) {
850 err = jbd2_journal_destroy(sbi->s_journal);
851 sbi->s_journal = NULL;
852 if (err < 0)
c67d859e 853 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 854 }
d4edac31 855
a1c6c569 856 del_timer(&sbi->s_err_report);
d4edac31
JB		 857 ext4_release_system_zone(sb);
858 ext4_mb_release(sb);
859 ext4_ext_release(sb);
860 ext4_xattr_put_super(sb);
861
ac27a0ec 862 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 863 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 864 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 865 }
a8e25a83
AB		 866 if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
867 ext4_commit_super(sb, 1);
868
240799cd 869 if (sbi->s_proc) {
66acdcf4 870 remove_proc_entry("options", sbi->s_proc);
9f6200bb 871 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 872 }
3197ebdb 873 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 874
875 for (i = 0; i < sbi->s_gdb_count; i++)
876 brelse(sbi->s_group_desc[i]);
f18a5f21 877 ext4_kvfree(sbi->s_group_desc);
9933fc0a 878 ext4_kvfree(sbi->s_flex_groups);
57042651 879 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 880 percpu_counter_destroy(&sbi->s_freeinodes_counter);
881 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 882 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 883 brelse(sbi->s_sbh);
884#ifdef CONFIG_QUOTA
885 for (i = 0; i < MAXQUOTAS; i++)
886 kfree(sbi->s_qf_names[i]);
887#endif
888
889 /* Debugging code just in case the in-memory inode orphan list
890 * isn't empty. The on-disk one can be non-empty if we've
891 * detected an error and taken the fs readonly, but the
892 * in-memory list had better be clean by this point. */
893 if (!list_empty(&sbi->s_orphan))
894 dump_orphan_list(sb, sbi);
895 J_ASSERT(list_empty(&sbi->s_orphan));
896
f98393a6 897 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 898 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
899 /*
900 * Invalidate the journal device's buffers. We don't want them
901 * floating about in memory - the physical journal device may
902 * hotswapped, and it breaks the `ro-after' testing code.
903 */
904 sync_blockdev(sbi->journal_bdev);
f98393a6 905 invalidate_bdev(sbi->journal_bdev);
617ba13b 906 ext4_blkdev_remove(sbi);
ac27a0ec 907 }
c5e06d10
JL		 908 if (sbi->s_mmp_tsk)
909 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 910 sb->s_fs_info = NULL;
3197ebdb
TT		 911 /*
912 * Now that we are completely done shutting down the
913 * superblock, we need to actually destroy the kobject.
914 */
3197ebdb
TT		 915 unlock_super(sb);
916 kobject_put(&sbi->s_kobj);
917 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 918 if (sbi->s_chksum_driver)
919 crypto_free_shash(sbi->s_chksum_driver);
705895b6 920 kfree(sbi->s_blockgroup_lock);
ac27a0ec 921 kfree(sbi);
ac27a0ec
DK		 922}
923
e18b890b 924static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 925
926/*
927 * Called inside transaction, so use GFP_NOFS
928 */
617ba13b 929static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 930{
617ba13b 931 struct ext4_inode_info *ei;
ac27a0ec 932
e6b4f8da 933 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 934 if (!ei)
935 return NULL;
0b8e58a1 936
ac27a0ec 937 ei->vfs_inode.i_version = 1;
91246c00 938 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 939 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 940 INIT_LIST_HEAD(&ei->i_prealloc_list);
941 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 942 ei->i_reserved_data_blocks = 0;
943 ei->i_reserved_meta_blocks = 0;
944 ei->i_allocated_meta_blocks = 0;
9d0be502 945 ei->i_da_metadata_calc_len = 0;
d2a17637 946 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 947#ifdef CONFIG_QUOTA
948 ei->i_reserved_quota = 0;
949#endif
8aefcd55 950 ei->jinode = NULL;
c7064ef1 951 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 952 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 953 ei->cur_aio_dio = NULL;
b436b9be
JK		 954 ei->i_sync_tid = 0;
955 ei->i_datasync_tid = 0;
f7ad6d2e 956 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 957 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 958
ac27a0ec
DK		 959 return &ei->vfs_inode;
960}
961
7ff9c073
TT		 962static int ext4_drop_inode(struct inode *inode)
963{
964 int drop = generic_drop_inode(inode);
965
966 trace_ext4_drop_inode(inode, drop);
967 return drop;
968}
969
fa0d7e3d
NP		 970static void ext4_i_callback(struct rcu_head *head)
971{
972 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 973 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
974}
975
617ba13b 976static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 977{
9f7dd93d 978 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 979 ext4_msg(inode->i_sb, KERN_ERR,
980 "Inode %lu (%p): orphan list check failed!",
981 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 982 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
983 EXT4_I(inode), sizeof(struct ext4_inode_info),
984 true);
985 dump_stack();
986 }
fa0d7e3d 987 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 988}
989
51cc5068 990static void init_once(void *foo)
ac27a0ec 991{
617ba13b 992 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 993
a35afb83 994 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 995#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 996 init_rwsem(&ei->xattr_sem);
ac27a0ec 997#endif
0e855ac8 998 init_rwsem(&ei->i_data_sem);
a35afb83 999 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1000}
1001
1002static int init_inodecache(void)
1003{
617ba13b
MC		 1004 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1005 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 1006 0, (SLAB_RECLAIM_ACCOUNT|
1007 SLAB_MEM_SPREAD),
20c2df83 1008 init_once);
617ba13b 1009 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1010 return -ENOMEM;
1011 return 0;
1012}
1013
1014static void destroy_inodecache(void)
1015{
617ba13b 1016 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1017}
1018
0930fcc1 1019void ext4_clear_inode(struct inode *inode)
ac27a0ec 1020{
0930fcc1
AV		 1021 invalidate_inode_buffers(inode);
1022 end_writeback(inode);
9f754758 1023 dquot_drop(inode);
c2ea3fde 1024 ext4_discard_preallocations(inode);
8aefcd55
TT		 1025 if (EXT4_I(inode)->jinode) {
1026 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1027 EXT4_I(inode)->jinode);
1028 jbd2_free_inode(EXT4_I(inode)->jinode);
1029 EXT4_I(inode)->jinode = NULL;
1030 }
ac27a0ec
DK		 1031}
1032
1b961ac0 1033static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1034 u64 ino, u32 generation)
ac27a0ec 1035{
ac27a0ec 1036 struct inode *inode;
ac27a0ec 1037
617ba13b 1038 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1039 return ERR_PTR(-ESTALE);
617ba13b 1040 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1041 return ERR_PTR(-ESTALE);
1042
1043 /* iget isn't really right if the inode is currently unallocated!!
1044 *
617ba13b 1045 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1046 * deleted, so we should be safe.
1047 *
1048 * Currently we don't know the generation for parent directory, so
1049 * a generation of 0 means "accept any"
1050 */
1d1fe1ee
DH		 1051 inode = ext4_iget(sb, ino);
1052 if (IS_ERR(inode))
1053 return ERR_CAST(inode);
1054 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1055 iput(inode);
1056 return ERR_PTR(-ESTALE);
1057 }
1b961ac0
CH		 1058
1059 return inode;
1060}
1061
1062static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1063 int fh_len, int fh_type)
1b961ac0
CH		 1064{
1065 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1066 ext4_nfs_get_inode);
1067}
1068
1069static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1070 int fh_len, int fh_type)
1b961ac0
CH		 1071{
1072 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1073 ext4_nfs_get_inode);
ac27a0ec
DK		 1074}
1075
c39a7f84
TO		 1076/*
1077 * Try to release metadata pages (indirect blocks, directories) which are
1078 * mapped via the block device. Since these pages could have journal heads
1079 * which would prevent try_to_free_buffers() from freeing them, we must use
1080 * jbd2 layer's try_to_free_buffers() function to release them.
1081 */
0b8e58a1
AD		 1082static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1083 gfp_t wait)
c39a7f84
TO		 1084{
1085 journal_t *journal = EXT4_SB(sb)->s_journal;
1086
1087 WARN_ON(PageChecked(page));
1088 if (!page_has_buffers(page))
1089 return 0;
1090 if (journal)
1091 return jbd2_journal_try_to_free_buffers(journal, page,
1092 wait & ~__GFP_WAIT);
1093 return try_to_free_buffers(page);
1094}
1095
ac27a0ec 1096#ifdef CONFIG_QUOTA
af5bc92d 1097#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1098#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1099
617ba13b
MC		 1100static int ext4_write_dquot(struct dquot *dquot);
1101static int ext4_acquire_dquot(struct dquot *dquot);
1102static int ext4_release_dquot(struct dquot *dquot);
1103static int ext4_mark_dquot_dirty(struct dquot *dquot);
1104static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1105static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1106 struct path *path);
ca0e05e4 1107static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1108static int ext4_quota_on_mount(struct super_block *sb, int type);
1109static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1110 size_t len, loff_t off);
617ba13b 1111static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1112 const char *data, size_t len, loff_t off);
1113
61e225dc 1114static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1115 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1116 .write_dquot = ext4_write_dquot,
1117 .acquire_dquot = ext4_acquire_dquot,
1118 .release_dquot = ext4_release_dquot,
1119 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1120 .write_info = ext4_write_info,
1121 .alloc_dquot = dquot_alloc,
1122 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1123};
1124
0d54b217 1125static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1126 .quota_on = ext4_quota_on,
ca0e05e4 1127 .quota_off = ext4_quota_off,
287a8095
CH		 1128 .quota_sync = dquot_quota_sync,
1129 .get_info = dquot_get_dqinfo,
1130 .set_info = dquot_set_dqinfo,
1131 .get_dqblk = dquot_get_dqblk,
1132 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1133};
1134#endif
1135
ee9b6d61 1136static const struct super_operations ext4_sops = {
617ba13b
MC		 1137 .alloc_inode = ext4_alloc_inode,
1138 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1139 .write_inode = ext4_write_inode,
1140 .dirty_inode = ext4_dirty_inode,
7ff9c073 1141 .drop_inode = ext4_drop_inode,
0930fcc1 1142 .evict_inode = ext4_evict_inode,
617ba13b 1143 .put_super = ext4_put_super,
617ba13b 1144 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1145 .freeze_fs = ext4_freeze,
1146 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1147 .statfs = ext4_statfs,
1148 .remount_fs = ext4_remount,
617ba13b 1149 .show_options = ext4_show_options,
ac27a0ec 1150#ifdef CONFIG_QUOTA
617ba13b
MC		 1151 .quota_read = ext4_quota_read,
1152 .quota_write = ext4_quota_write,
ac27a0ec 1153#endif
c39a7f84 1154 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1155};
1156
9ca92389
TT		 1157static const struct super_operations ext4_nojournal_sops = {
1158 .alloc_inode = ext4_alloc_inode,
1159 .destroy_inode = ext4_destroy_inode,
1160 .write_inode = ext4_write_inode,
1161 .dirty_inode = ext4_dirty_inode,
7ff9c073 1162 .drop_inode = ext4_drop_inode,
0930fcc1 1163 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1164 .write_super = ext4_write_super,
1165 .put_super = ext4_put_super,
1166 .statfs = ext4_statfs,
1167 .remount_fs = ext4_remount,
9ca92389
TT		 1168 .show_options = ext4_show_options,
1169#ifdef CONFIG_QUOTA
1170 .quota_read = ext4_quota_read,
1171 .quota_write = ext4_quota_write,
1172#endif
1173 .bdev_try_to_free_page = bdev_try_to_free_page,
1174};
1175
39655164 1176static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1177 .fh_to_dentry = ext4_fh_to_dentry,
1178 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1179 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1180};
1181
1182enum {
1183 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1184 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1185 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1186 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1187 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1188 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1189 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1190 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1191 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1192 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1193 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1194 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1195 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1196 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1197 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1198 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1199 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1200 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1201};
1202
a447c093 1203static const match_table_t tokens = {
ac27a0ec
DK		 1204 {Opt_bsd_df, "bsddf"},
1205 {Opt_minix_df, "minixdf"},
1206 {Opt_grpid, "grpid"},
1207 {Opt_grpid, "bsdgroups"},
1208 {Opt_nogrpid, "nogrpid"},
1209 {Opt_nogrpid, "sysvgroups"},
1210 {Opt_resgid, "resgid=%u"},
1211 {Opt_resuid, "resuid=%u"},
1212 {Opt_sb, "sb=%u"},
1213 {Opt_err_cont, "errors=continue"},
1214 {Opt_err_panic, "errors=panic"},
1215 {Opt_err_ro, "errors=remount-ro"},
1216 {Opt_nouid32, "nouid32"},
ac27a0ec 1217 {Opt_debug, "debug"},
72578c33
TT		 1218 {Opt_removed, "oldalloc"},
1219 {Opt_removed, "orlov"},
ac27a0ec
DK		 1220 {Opt_user_xattr, "user_xattr"},
1221 {Opt_nouser_xattr, "nouser_xattr"},
1222 {Opt_acl, "acl"},
1223 {Opt_noacl, "noacl"},
e3bb52ae 1224 {Opt_noload, "norecovery"},
5a916be1 1225 {Opt_noload, "noload"},
72578c33
TT		 1226 {Opt_removed, "nobh"},
1227 {Opt_removed, "bh"},
ac27a0ec 1228 {Opt_commit, "commit=%u"},
30773840
TT		 1229 {Opt_min_batch_time, "min_batch_time=%u"},
1230 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1231 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1232 {Opt_journal_checksum, "journal_checksum"},
1233 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1234 {Opt_abort, "abort"},
1235 {Opt_data_journal, "data=journal"},
1236 {Opt_data_ordered, "data=ordered"},
1237 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1238 {Opt_data_err_abort, "data_err=abort"},
1239 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1240 {Opt_offusrjquota, "usrjquota="},
1241 {Opt_usrjquota, "usrjquota=%s"},
1242 {Opt_offgrpjquota, "grpjquota="},
1243 {Opt_grpjquota, "grpjquota=%s"},
1244 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1245 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1246 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1247 {Opt_grpquota, "grpquota"},
1248 {Opt_noquota, "noquota"},
1249 {Opt_quota, "quota"},
1250 {Opt_usrquota, "usrquota"},
1251 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1252 {Opt_barrier, "barrier"},
1253 {Opt_nobarrier, "nobarrier"},
25ec56b5 1254 {Opt_i_version, "i_version"},
c9de560d 1255 {Opt_stripe, "stripe=%u"},
64769240 1256 {Opt_delalloc, "delalloc"},
dd919b98 1257 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1258 {Opt_mblk_io_submit, "mblk_io_submit"},
1259 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1260 {Opt_block_validity, "block_validity"},
1261 {Opt_noblock_validity, "noblock_validity"},
240799cd 1262 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1263 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1264 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1265 {Opt_auto_da_alloc, "auto_da_alloc"},
1266 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1267 {Opt_dioread_nolock, "dioread_nolock"},
1268 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1269 {Opt_discard, "discard"},
1270 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1271 {Opt_init_itable, "init_itable=%u"},
1272 {Opt_init_itable, "init_itable"},
1273 {Opt_noinit_itable, "noinit_itable"},
c7198b9c
TT		 1274 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1275 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1276 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1277 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1278 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1279 {Opt_err, NULL},
ac27a0ec
DK		 1280};
1281
617ba13b 1282static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1283{
617ba13b 1284 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1285 char *options = (char *) *data;
1286
1287 if (!options || strncmp(options, "sb=", 3) != 0)
1288 return 1; /* Default location */
0b8e58a1 1289
ac27a0ec 1290 options += 3;
0b8e58a1 1291 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1292 sb_block = simple_strtoul(options, &options, 0);
1293 if (*options && *options != ',') {
4776004f 1294 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1295 (char *) *data);
1296 return 1;
1297 }
1298 if (*options == ',')
1299 options++;
1300 *data = (void *) options;
0b8e58a1 1301
ac27a0ec
DK		 1302 return sb_block;
1303}
1304
b3881f74 1305#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1306static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1307 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1308
56c50f11
DM		 1309#ifdef CONFIG_QUOTA
1310static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1311{
1312 struct ext4_sb_info *sbi = EXT4_SB(sb);
1313 char *qname;
1314
1315 if (sb_any_quota_loaded(sb) &&
1316 !sbi->s_qf_names[qtype]) {
1317 ext4_msg(sb, KERN_ERR,
1318 "Cannot change journaled "
1319 "quota options when quota turned on");
57f73c2c 1320 return -1;
56c50f11
DM		 1321 }
1322 qname = match_strdup(args);
1323 if (!qname) {
1324 ext4_msg(sb, KERN_ERR,
1325 "Not enough memory for storing quotafile name");
57f73c2c 1326 return -1;
56c50f11
DM		 1327 }
1328 if (sbi->s_qf_names[qtype] &&
1329 strcmp(sbi->s_qf_names[qtype], qname)) {
1330 ext4_msg(sb, KERN_ERR,
1331 "%s quota file already specified", QTYPE2NAME(qtype));
1332 kfree(qname);
57f73c2c 1333 return -1;
56c50f11
DM		 1334 }
1335 sbi->s_qf_names[qtype] = qname;
1336 if (strchr(sbi->s_qf_names[qtype], '/')) {
1337 ext4_msg(sb, KERN_ERR,
1338 "quotafile must be on filesystem root");
1339 kfree(sbi->s_qf_names[qtype]);
1340 sbi->s_qf_names[qtype] = NULL;
57f73c2c 1341 return -1;
56c50f11 1342 }
fd8c37ec 1343 set_opt(sb, QUOTA);
56c50f11
DM		 1344 return 1;
1345}
1346
1347static int clear_qf_name(struct super_block *sb, int qtype)
1348{
1349
1350 struct ext4_sb_info *sbi = EXT4_SB(sb);
1351
1352 if (sb_any_quota_loaded(sb) &&
1353 sbi->s_qf_names[qtype]) {
1354 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1355 " when quota turned on");
57f73c2c 1356 return -1;
56c50f11
DM		 1357 }
1358 /*
1359 * The space will be released later when all options are confirmed
1360 * to be correct
1361 */
1362 sbi->s_qf_names[qtype] = NULL;
1363 return 1;
1364}
1365#endif
1366
26092bf5
TT		 1367#define MOPT_SET 0x0001
1368#define MOPT_CLEAR 0x0002
1369#define MOPT_NOSUPPORT 0x0004
1370#define MOPT_EXPLICIT 0x0008
1371#define MOPT_CLEAR_ERR 0x0010
1372#define MOPT_GTE0 0x0020
ac27a0ec 1373#ifdef CONFIG_QUOTA
26092bf5
TT		 1374#define MOPT_Q 0
1375#define MOPT_QFMT 0x0040
1376#else
1377#define MOPT_Q MOPT_NOSUPPORT
1378#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1379#endif
26092bf5
TT		 1380#define MOPT_DATAJ 0x0080
1381
1382static const struct mount_opts {
1383 int token;
1384 int mount_opt;
1385 int flags;
1386} ext4_mount_opts[] = {
1387 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1388 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1389 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1390 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1391 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1392 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1393 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1394 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1395 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1396 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1397 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1398 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1399 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1400 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1401 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1402 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1403 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1404 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1405 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1406 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1407 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1408 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1409 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1410 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1411 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1412 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1413 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1414 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1415 {Opt_commit, 0, MOPT_GTE0},
1416 {Opt_max_batch_time, 0, MOPT_GTE0},
1417 {Opt_min_batch_time, 0, MOPT_GTE0},
1418 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1419 {Opt_init_itable, 0, MOPT_GTE0},
1420 {Opt_stripe, 0, MOPT_GTE0},
1421 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1422 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1423 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1424#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1425 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1426 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1427#else
26092bf5
TT		 1428 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1429 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1430#endif
03010a33 1431#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1432 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1433 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1434#else
26092bf5
TT		 1435 {Opt_acl, 0, MOPT_NOSUPPORT},
1436 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1437#endif
26092bf5
TT		 1438 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1439 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1440 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1441 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1442 MOPT_SET | MOPT_Q},
1443 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1444 MOPT_SET | MOPT_Q},
1445 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1446 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1447 {Opt_usrjquota, 0, MOPT_Q},
1448 {Opt_grpjquota, 0, MOPT_Q},
1449 {Opt_offusrjquota, 0, MOPT_Q},
1450 {Opt_offgrpjquota, 0, MOPT_Q},
1451 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1452 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1453 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1454 {Opt_err, 0, 0}
1455};
1456
1457static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1458 substring_t *args, unsigned long *journal_devnum,
1459 unsigned int *journal_ioprio, int is_remount)
1460{
1461 struct ext4_sb_info *sbi = EXT4_SB(sb);
1462 const struct mount_opts *m;
1463 int arg = 0;
1464
57f73c2c
TT		 1465#ifdef CONFIG_QUOTA
1466 if (token == Opt_usrjquota)
1467 return set_qf_name(sb, USRQUOTA, &args[0]);
1468 else if (token == Opt_grpjquota)
1469 return set_qf_name(sb, GRPQUOTA, &args[0]);
1470 else if (token == Opt_offusrjquota)
1471 return clear_qf_name(sb, USRQUOTA);
1472 else if (token == Opt_offgrpjquota)
1473 return clear_qf_name(sb, GRPQUOTA);
1474#endif
26092bf5
TT		 1475 if (args->from && match_int(args, &arg))
1476 return -1;
1477 switch (token) {
f7048605
TT		 1478 case Opt_noacl:
1479 case Opt_nouser_xattr:
1480 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1481 break;
26092bf5
TT		 1482 case Opt_sb:
1483 return 1; /* handled by get_sb_block() */
1484 case Opt_removed:
1485 ext4_msg(sb, KERN_WARNING,
1486 "Ignoring removed %s option", opt);
1487 return 1;
1488 case Opt_resuid:
1489 sbi->s_resuid = arg;
1490 return 1;
1491 case Opt_resgid:
1492 sbi->s_resgid = arg;
1493 return 1;
1494 case Opt_abort:
1495 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1496 return 1;
1497 case Opt_i_version:
1498 sb->s_flags |= MS_I_VERSION;
1499 return 1;
1500 case Opt_journal_dev:
1501 if (is_remount) {
1502 ext4_msg(sb, KERN_ERR,
1503 "Cannot specify journal on remount");
1504 return -1;
1505 }
1506 *journal_devnum = arg;
1507 return 1;
1508 case Opt_journal_ioprio:
1509 if (arg < 0 || arg > 7)
1510 return -1;
1511 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1512 return 1;
1513 }
1514
1515 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1516 if (token != m->token)
1517 continue;
1518 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1519 return -1;
1520 if (m->flags & MOPT_EXPLICIT)
1521 set_opt2(sb, EXPLICIT_DELALLOC);
1522 if (m->flags & MOPT_CLEAR_ERR)
1523 clear_opt(sb, ERRORS_MASK);
1524 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1525 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1526 "options when quota turned on");
1527 return -1;
1528 }
1529
1530 if (m->flags & MOPT_NOSUPPORT) {
1531 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1532 } else if (token == Opt_commit) {
1533 if (arg == 0)
1534 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1535 sbi->s_commit_interval = HZ * arg;
1536 } else if (token == Opt_max_batch_time) {
1537 if (arg == 0)
1538 arg = EXT4_DEF_MAX_BATCH_TIME;
1539 sbi->s_max_batch_time = arg;
1540 } else if (token == Opt_min_batch_time) {
1541 sbi->s_min_batch_time = arg;
1542 } else if (token == Opt_inode_readahead_blks) {
1543 if (arg > (1 << 30))
1544 return -1;
1545 if (arg && !is_power_of_2(arg)) {
b31e1552 1546 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1547 "EXT4-fs: inode_readahead_blks"
1548 " must be a power of 2");
1549 return -1;
ac27a0ec 1550 }
26092bf5
TT		 1551 sbi->s_inode_readahead_blks = arg;
1552 } else if (token == Opt_init_itable) {
1553 set_opt(sb, INIT_INODE_TABLE);
1554 if (!args->from)
1555 arg = EXT4_DEF_LI_WAIT_MULT;
1556 sbi->s_li_wait_mult = arg;
1557 } else if (token == Opt_stripe) {
1558 sbi->s_stripe = arg;
1559 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1560 if (is_remount) {
eb513689
TT		 1561 if (!sbi->s_journal)
1562 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1563 else if (test_opt(sb, DATA_FLAGS) !=
1564 m->mount_opt) {
b31e1552 1565 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1566 "Cannot change data mode on remount");
1567 return -1;
ac27a0ec
DK		 1568 }
1569 } else {
fd8c37ec 1570 clear_opt(sb, DATA_FLAGS);
26092bf5 1571 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1572 }
ac27a0ec 1573#ifdef CONFIG_QUOTA
26092bf5 1574 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1575 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1576 sbi->s_jquota_fmt != m->mount_opt) {
1577 ext4_msg(sb, KERN_ERR, "Cannot "
1578 "change journaled quota options "
1579 "when quota turned on");
1580 return -1;
ac27a0ec 1581 }
26092bf5 1582 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1583#endif
26092bf5
TT		 1584 } else {
1585 if (!args->from)
1586 arg = 1;
1587 if (m->flags & MOPT_CLEAR)
1588 arg = !arg;
1589 else if (unlikely(!(m->flags & MOPT_SET))) {
1590 ext4_msg(sb, KERN_WARNING,
1591 "buggy handling of option %s", opt);
1592 WARN_ON(1);
1593 return -1;
3197ebdb 1594 }
26092bf5
TT		 1595 if (arg != 0)
1596 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1597 else
26092bf5 1598 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1599 }
26092bf5
TT		 1600 return 1;
1601 }
1602 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1603 "or missing value", opt);
1604 return -1;
1605}
1606
1607static int parse_options(char *options, struct super_block *sb,
1608 unsigned long *journal_devnum,
1609 unsigned int *journal_ioprio,
1610 int is_remount)
1611{
db7e5c66 1612#ifdef CONFIG_QUOTA
26092bf5 1613 struct ext4_sb_info *sbi = EXT4_SB(sb);
db7e5c66 1614#endif
26092bf5
TT		 1615 char *p;
1616 substring_t args[MAX_OPT_ARGS];
1617 int token;
1618
1619 if (!options)
1620 return 1;
1621
1622 while ((p = strsep(&options, ",")) != NULL) {
1623 if (!*p)
1624 continue;
1625 /*
1626 * Initialize args struct so we know whether arg was
1627 * found; some options take optional arguments.
1628 */
1629 args[0].to = args[0].from = 0;
1630 token = match_token(p, tokens, args);
1631 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1632 journal_ioprio, is_remount) < 0)
1633 return 0;
ac27a0ec
DK		 1634 }
1635#ifdef CONFIG_QUOTA
1636 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1637 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1638 clear_opt(sb, USRQUOTA);
ac27a0ec 1639
482a7425 1640 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1641 clear_opt(sb, GRPQUOTA);
ac27a0ec 1642
56c50f11 1643 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1644 ext4_msg(sb, KERN_ERR, "old and new quota "
1645 "format mixing");
ac27a0ec
DK		 1646 return 0;
1647 }
1648
1649 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1650 ext4_msg(sb, KERN_ERR, "journaled quota format "
1651 "not specified");
ac27a0ec
DK		 1652 return 0;
1653 }
1654 } else {
1655 if (sbi->s_jquota_fmt) {
b31e1552 1656 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1657 "specified with no journaling "
b31e1552 1658 "enabled");
ac27a0ec
DK		 1659 return 0;
1660 }
1661 }
1662#endif
1663 return 1;
1664}
1665
2adf6da8
TT		 1666static inline void ext4_show_quota_options(struct seq_file *seq,
1667 struct super_block *sb)
1668{
1669#if defined(CONFIG_QUOTA)
1670 struct ext4_sb_info *sbi = EXT4_SB(sb);
1671
1672 if (sbi->s_jquota_fmt) {
1673 char *fmtname = "";
1674
1675 switch (sbi->s_jquota_fmt) {
1676 case QFMT_VFS_OLD:
1677 fmtname = "vfsold";
1678 break;
1679 case QFMT_VFS_V0:
1680 fmtname = "vfsv0";
1681 break;
1682 case QFMT_VFS_V1:
1683 fmtname = "vfsv1";
1684 break;
1685 }
1686 seq_printf(seq, ",jqfmt=%s", fmtname);
1687 }
1688
1689 if (sbi->s_qf_names[USRQUOTA])
1690 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1691
1692 if (sbi->s_qf_names[GRPQUOTA])
1693 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1694
1695 if (test_opt(sb, USRQUOTA))
1696 seq_puts(seq, ",usrquota");
1697
1698 if (test_opt(sb, GRPQUOTA))
1699 seq_puts(seq, ",grpquota");
1700#endif
1701}
1702
5a916be1
TT		 1703static const char *token2str(int token)
1704{
1705 static const struct match_token *t;
1706
1707 for (t = tokens; t->token != Opt_err; t++)
1708 if (t->token == token && !strchr(t->pattern, '='))
1709 break;
1710 return t->pattern;
1711}
1712
2adf6da8
TT		 1713/*
1714 * Show an option if
1715 * - it's set to a non-default value OR
1716 * - if the per-sb default is different from the global default
1717 */
66acdcf4
TT		 1718static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1719 int nodefs)
2adf6da8 1720{
2adf6da8
TT		 1721 struct ext4_sb_info *sbi = EXT4_SB(sb);
1722 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1723 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1724 const struct mount_opts *m;
66acdcf4 1725 char sep = nodefs ? '\n' : ',';
2adf6da8 1726
66acdcf4
TT		 1727#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1728#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1729
1730 if (sbi->s_sb_block != 1)
5a916be1
TT		 1731 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1732
1733 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1734 int want_set = m->flags & MOPT_SET;
1735 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1736 (m->flags & MOPT_CLEAR_ERR))
1737 continue;
66acdcf4 1738 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1739 continue; /* skip if same as the default */
1740 if ((want_set &&
1741 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1742 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1743 continue; /* select Opt_noFoo vs Opt_Foo */
1744 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1745 }
5a916be1 1746
66acdcf4 1747 if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
5a916be1
TT		 1748 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1749 SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
66acdcf4 1750 if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
5a916be1
TT		 1751 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1752 SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
66acdcf4 1753 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1754 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1755 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1756 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1757 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1758 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1759 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1760 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1761 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1762 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1763 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1764 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1765 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1766 if (sb->s_flags & MS_I_VERSION)
5a916be1 1767 SEQ_OPTS_PUTS("i_version");
66acdcf4 1768 if (nodefs || sbi->s_stripe)
5a916be1 1769 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1770 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1771 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1772 SEQ_OPTS_PUTS("data=journal");
1773 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1774 SEQ_OPTS_PUTS("data=ordered");
1775 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1776 SEQ_OPTS_PUTS("data=writeback");
1777 }
66acdcf4
TT		 1778 if (nodefs ||
1779 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1780 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1781 sbi->s_inode_readahead_blks);
2adf6da8 1782
66acdcf4
TT		 1783 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1784 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1785 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2adf6da8
TT		 1786
1787 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1788 return 0;
1789}
1790
66acdcf4
TT		 1791static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1792{
1793 return _ext4_show_options(seq, root->d_sb, 0);
1794}
1795
1796static int options_seq_show(struct seq_file *seq, void *offset)
1797{
1798 struct super_block *sb = seq->private;
1799 int rc;
1800
1801 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1802 rc = _ext4_show_options(seq, sb, 1);
1803 seq_puts(seq, "\n");
1804 return rc;
1805}
1806
1807static int options_open_fs(struct inode *inode, struct file *file)
1808{
1809 return single_open(file, options_seq_show, PDE(inode)->data);
1810}
1811
1812static const struct file_operations ext4_seq_options_fops = {
1813 .owner = THIS_MODULE,
1814 .open = options_open_fs,
1815 .read = seq_read,
1816 .llseek = seq_lseek,
1817 .release = single_release,
1818};
1819
617ba13b 1820static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1821 int read_only)
1822{
617ba13b 1823 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1824 int res = 0;
1825
617ba13b 1826 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1827 ext4_msg(sb, KERN_ERR, "revision level too high, "
1828 "forcing read-only mode");
ac27a0ec
DK		 1829 res = MS_RDONLY;
1830 }
1831 if (read_only)
281b5995 1832 goto done;
617ba13b 1833 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1834 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1835 "running e2fsck is recommended");
617ba13b 1836 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1837 ext4_msg(sb, KERN_WARNING,
1838 "warning: mounting fs with errors, "
1839 "running e2fsck is recommended");
ed3ce80a 1840 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1841 le16_to_cpu(es->s_mnt_count) >=
1842 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1843 ext4_msg(sb, KERN_WARNING,
1844 "warning: maximal mount count reached, "
1845 "running e2fsck is recommended");
ac27a0ec
DK		 1846 else if (le32_to_cpu(es->s_checkinterval) &&
1847 (le32_to_cpu(es->s_lastcheck) +
1848 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1849 ext4_msg(sb, KERN_WARNING,
1850 "warning: checktime reached, "
1851 "running e2fsck is recommended");
0b8e58a1 1852 if (!sbi->s_journal)
0390131b 1853 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1854 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1855 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1856 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1857 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1858 ext4_update_dynamic_rev(sb);
0390131b
FM		 1859 if (sbi->s_journal)
1860 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1861
e2d67052 1862 ext4_commit_super(sb, 1);
281b5995 1863done:
ac27a0ec 1864 if (test_opt(sb, DEBUG))
a9df9a49 1865 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1866 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1867 sb->s_blocksize,
1868 sbi->s_groups_count,
617ba13b
MC		 1869 EXT4_BLOCKS_PER_GROUP(sb),
1870 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1871 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1872
7abc52c2 1873 cleancache_init_fs(sb);
ac27a0ec
DK		 1874 return res;
1875}
1876
772cb7c8
JS		 1877static int ext4_fill_flex_info(struct super_block *sb)
1878{
1879 struct ext4_sb_info *sbi = EXT4_SB(sb);
1880 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1881 ext4_group_t flex_group_count;
1882 ext4_group_t flex_group;
d50f2ab6 1883 unsigned int groups_per_flex = 0;
c5ca7c76 1884 size_t size;
772cb7c8
JS		 1885 int i;
1886
503358ae 1887 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1888 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1889 sbi->s_log_groups_per_flex = 0;
1890 return 1;
1891 }
d50f2ab6 1892 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1893
c62a11fd
FB		 1894 /* We allocate both existing and potentially added groups */
1895 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1896 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1897 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1898 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1899 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1900 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1901 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1902 flex_group_count);
1903 goto failed;
772cb7c8 1904 }
772cb7c8 1905
772cb7c8 1906 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1907 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1908
1909 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1910 atomic_add(ext4_free_inodes_count(sb, gdp),
1911 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1912 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1913 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1914 atomic_add(ext4_used_dirs_count(sb, gdp),
1915 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1916 }
1917
1918 return 1;
1919failed:
1920 return 0;
1921}
1922
717d50e4
AD		 1923__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1924 struct ext4_group_desc *gdp)
1925{
1926 __u16 crc = 0;
1927
1928 if (sbi->s_es->s_feature_ro_compat &
1929 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1930 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1931 __le32 le_group = cpu_to_le32(block_group);
1932
1933 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1934 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1935 crc = crc16(crc, (__u8 *)gdp, offset);
1936 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1937 /* for checksum of struct ext4_group_desc do the rest...*/
1938 if ((sbi->s_es->s_feature_incompat &
1939 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1940 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1941 crc = crc16(crc, (__u8 *)gdp + offset,
1942 le16_to_cpu(sbi->s_es->s_desc_size) -
1943 offset);
1944 }
1945
1946 return cpu_to_le16(crc);
1947}
1948
1949int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1950 struct ext4_group_desc *gdp)
1951{
1952 if ((sbi->s_es->s_feature_ro_compat &
1953 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1954 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1955 return 0;
1956
1957 return 1;
1958}
1959
ac27a0ec 1960/* Called at mount-time, super-block is locked */
bfff6873
LC		 1961static int ext4_check_descriptors(struct super_block *sb,
1962 ext4_group_t *first_not_zeroed)
ac27a0ec 1963{
617ba13b
MC		 1964 struct ext4_sb_info *sbi = EXT4_SB(sb);
1965 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1966 ext4_fsblk_t last_block;
bd81d8ee
LV		 1967 ext4_fsblk_t block_bitmap;
1968 ext4_fsblk_t inode_bitmap;
1969 ext4_fsblk_t inode_table;
ce421581 1970 int flexbg_flag = 0;
bfff6873 1971 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 1972
ce421581
JS		 1973 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1974 flexbg_flag = 1;
1975
af5bc92d 1976 ext4_debug("Checking group descriptors");
ac27a0ec 1977
197cd65a
AM		 1978 for (i = 0; i < sbi->s_groups_count; i++) {
1979 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1980
ce421581 1981 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1982 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1983 else
1984 last_block = first_block +
617ba13b 1985 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1986
bfff6873
LC		 1987 if ((grp == sbi->s_groups_count) &&
1988 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
1989 grp = i;
1990
8fadc143 1991 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1992 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1993 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1994 "Block bitmap for group %u not in group "
b31e1552 1995 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1996 return 0;
1997 }
8fadc143 1998 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1999 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2000 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2001 "Inode bitmap for group %u not in group "
b31e1552 2002 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2003 return 0;
2004 }
8fadc143 2005 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2006 if (inode_table < first_block ||
2b2d6d01 2007 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2008 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2009 "Inode table for group %u not in group "
b31e1552 2010 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2011 return 0;
2012 }
955ce5f5 2013 ext4_lock_group(sb, i);
717d50e4 2014 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2015 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2016 "Checksum for group %u failed (%u!=%u)",
2017 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2018 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2019 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2020 ext4_unlock_group(sb, i);
8a266467 2021 return 0;
7ee1ec4c 2022 }
717d50e4 2023 }
955ce5f5 2024 ext4_unlock_group(sb, i);
ce421581
JS		 2025 if (!flexbg_flag)
2026 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2027 }
bfff6873
LC		 2028 if (NULL != first_not_zeroed)
2029 *first_not_zeroed = grp;
ac27a0ec 2030
5dee5437
TT		 2031 ext4_free_blocks_count_set(sbi->s_es,
2032 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2033 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2034 return 1;
2035}
2036
617ba13b 2037/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2038 * the superblock) which were deleted from all directories, but held open by
2039 * a process at the time of a crash. We walk the list and try to delete these
2040 * inodes at recovery time (only with a read-write filesystem).
2041 *
2042 * In order to keep the orphan inode chain consistent during traversal (in
2043 * case of crash during recovery), we link each inode into the superblock
2044 * orphan list_head and handle it the same way as an inode deletion during
2045 * normal operation (which journals the operations for us).
2046 *
2047 * We only do an iget() and an iput() on each inode, which is very safe if we
2048 * accidentally point at an in-use or already deleted inode. The worst that
2049 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2050 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2051 * e2fsck was run on this filesystem, and it must have already done the orphan
2052 * inode cleanup for us, so we can safely abort without any further action.
2053 */
2b2d6d01
TT		 2054static void ext4_orphan_cleanup(struct super_block *sb,
2055 struct ext4_super_block *es)
ac27a0ec
DK		 2056{
2057 unsigned int s_flags = sb->s_flags;
2058 int nr_orphans = 0, nr_truncates = 0;
2059#ifdef CONFIG_QUOTA
2060 int i;
2061#endif
2062 if (!es->s_last_orphan) {
2063 jbd_debug(4, "no orphan inodes to clean up\n");
2064 return;
2065 }
2066
a8f48a95 2067 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2068 ext4_msg(sb, KERN_ERR, "write access "
2069 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2070 return;
2071 }
2072
d39195c3
AG		 2073 /* Check if feature set would not allow a r/w mount */
2074 if (!ext4_feature_set_ok(sb, 0)) {
2075 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2076 "unknown ROCOMPAT features");
2077 return;
2078 }
2079
617ba13b 2080 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2081 if (es->s_last_orphan)
2082 jbd_debug(1, "Errors on filesystem, "
2083 "clearing orphan list.\n");
2084 es->s_last_orphan = 0;
2085 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2086 return;
2087 }
2088
2089 if (s_flags & MS_RDONLY) {
b31e1552 2090 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2091 sb->s_flags &= ~MS_RDONLY;
2092 }
2093#ifdef CONFIG_QUOTA
2094 /* Needed for iput() to work correctly and not trash data */
2095 sb->s_flags |= MS_ACTIVE;
2096 /* Turn on quotas so that they are updated correctly */
2097 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2098 if (EXT4_SB(sb)->s_qf_names[i]) {
2099 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2100 if (ret < 0)
b31e1552
ES		 2101 ext4_msg(sb, KERN_ERR,
2102 "Cannot turn on journaled "
2103 "quota: error %d", ret);
ac27a0ec
DK		 2104 }
2105 }
2106#endif
2107
2108 while (es->s_last_orphan) {
2109 struct inode *inode;
2110
97bd42b9
JB		 2111 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2112 if (IS_ERR(inode)) {
ac27a0ec
DK		 2113 es->s_last_orphan = 0;
2114 break;
2115 }
2116
617ba13b 2117 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2118 dquot_initialize(inode);
ac27a0ec 2119 if (inode->i_nlink) {
b31e1552
ES		 2120 ext4_msg(sb, KERN_DEBUG,
2121 "%s: truncating inode %lu to %lld bytes",
46e665e9 2122 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2123 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2124 inode->i_ino, inode->i_size);
617ba13b 2125 ext4_truncate(inode);
ac27a0ec
DK		 2126 nr_truncates++;
2127 } else {
b31e1552
ES		 2128 ext4_msg(sb, KERN_DEBUG,
2129 "%s: deleting unreferenced inode %lu",
46e665e9 2130 __func__, inode->i_ino);
ac27a0ec
DK		 2131 jbd_debug(2, "deleting unreferenced inode %lu\n",
2132 inode->i_ino);
2133 nr_orphans++;
2134 }
2135 iput(inode); /* The delete magic happens here! */
2136 }
2137
2b2d6d01 2138#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2139
2140 if (nr_orphans)
b31e1552
ES		 2141 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2142 PLURAL(nr_orphans));
ac27a0ec 2143 if (nr_truncates)
b31e1552
ES		 2144 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2145 PLURAL(nr_truncates));
ac27a0ec
DK		 2146#ifdef CONFIG_QUOTA
2147 /* Turn quotas off */
2148 for (i = 0; i < MAXQUOTAS; i++) {
2149 if (sb_dqopt(sb)->files[i])
287a8095 2150 dquot_quota_off(sb, i);
ac27a0ec
DK		 2151 }
2152#endif
2153 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2154}
0b8e58a1 2155
cd2291a4
ES		 2156/*
2157 * Maximal extent format file size.
2158 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2159 * extent format containers, within a sector_t, and within i_blocks
2160 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2161 * so that won't be a limiting factor.
2162 *
f17722f9
LC		 2163 * However there is other limiting factor. We do store extents in the form
2164 * of starting block and length, hence the resulting length of the extent
2165 * covering maximum file size must fit into on-disk format containers as
2166 * well. Given that length is always by 1 unit bigger than max unit (because
2167 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2168 *
cd2291a4
ES		 2169 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2170 */
f287a1a5 2171static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2172{
2173 loff_t res;
2174 loff_t upper_limit = MAX_LFS_FILESIZE;
2175
2176 /* small i_blocks in vfs inode? */
f287a1a5 2177 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2178 /*
90c699a9 2179 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2180 * i_block represent total blocks in 512 bytes
2181 * 32 == size of vfs inode i_blocks * 8
2182 */
2183 upper_limit = (1LL << 32) - 1;
2184
2185 /* total blocks in file system block size */
2186 upper_limit >>= (blkbits - 9);
2187 upper_limit <<= blkbits;
2188 }
2189
f17722f9
LC		 2190 /*
2191 * 32-bit extent-start container, ee_block. We lower the maxbytes
2192 * by one fs block, so ee_len can cover the extent of maximum file
2193 * size
2194 */
2195 res = (1LL << 32) - 1;
cd2291a4 2196 res <<= blkbits;
cd2291a4
ES		 2197
2198 /* Sanity check against vm- & vfs- imposed limits */
2199 if (res > upper_limit)
2200 res = upper_limit;
2201
2202 return res;
2203}
ac27a0ec 2204
ac27a0ec 2205/*
cd2291a4 2206 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2207 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2208 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2209 */
f287a1a5 2210static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2211{
617ba13b 2212 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2213 int meta_blocks;
2214 loff_t upper_limit;
0b8e58a1
AD		 2215 /* This is calculated to be the largest file size for a dense, block
2216 * mapped file such that the file's total number of 512-byte sectors,
2217 * including data and all indirect blocks, does not exceed (2^48 - 1).
2218 *
2219 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2220 * number of 512-byte sectors of the file.
0fc1b451
AK		 2221 */
2222
f287a1a5 2223 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2224 /*
90c699a9 2225 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2226 * the inode i_block field represents total file blocks in
2227 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2228 */
2229 upper_limit = (1LL << 32) - 1;
2230
2231 /* total blocks in file system block size */
2232 upper_limit >>= (bits - 9);
2233
2234 } else {
8180a562
AK		 2235 /*
2236 * We use 48 bit ext4_inode i_blocks
2237 * With EXT4_HUGE_FILE_FL set the i_blocks
2238 * represent total number of blocks in
2239 * file system block size
2240 */
0fc1b451
AK		 2241 upper_limit = (1LL << 48) - 1;
2242
0fc1b451
AK		 2243 }
2244
2245 /* indirect blocks */
2246 meta_blocks = 1;
2247 /* double indirect blocks */
2248 meta_blocks += 1 + (1LL << (bits-2));
2249 /* tripple indirect blocks */
2250 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2251
2252 upper_limit -= meta_blocks;
2253 upper_limit <<= bits;
ac27a0ec
DK		 2254
2255 res += 1LL << (bits-2);
2256 res += 1LL << (2*(bits-2));
2257 res += 1LL << (3*(bits-2));
2258 res <<= bits;
2259 if (res > upper_limit)
2260 res = upper_limit;
0fc1b451
AK		 2261
2262 if (res > MAX_LFS_FILESIZE)
2263 res = MAX_LFS_FILESIZE;
2264
ac27a0ec
DK		 2265 return res;
2266}
2267
617ba13b 2268static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2269 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2270{
617ba13b 2271 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2272 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2273 int has_super = 0;
2274
2275 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2276
617ba13b 2277 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2278 nr < first_meta_bg)
70bbb3e0 2279 return logical_sb_block + nr + 1;
ac27a0ec 2280 bg = sbi->s_desc_per_block * nr;
617ba13b 2281 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2282 has_super = 1;
0b8e58a1 2283
617ba13b 2284 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2285}
2286
c9de560d
AT		 2287/**
2288 * ext4_get_stripe_size: Get the stripe size.
2289 * @sbi: In memory super block info
2290 *
2291 * If we have specified it via mount option, then
2292 * use the mount option value. If the value specified at mount time is
2293 * greater than the blocks per group use the super block value.
2294 * If the super block value is greater than blocks per group return 0.
2295 * Allocator needs it be less than blocks per group.
2296 *
2297 */
2298static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2299{
2300 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2301 unsigned long stripe_width =
2302 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2303 int ret;
c9de560d
AT		 2304
2305 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2306 ret = sbi->s_stripe;
2307 else if (stripe_width <= sbi->s_blocks_per_group)
2308 ret = stripe_width;
2309 else if (stride <= sbi->s_blocks_per_group)
2310 ret = stride;
2311 else
2312 ret = 0;
c9de560d 2313
3eb08658
DE		 2314 /*
2315 * If the stripe width is 1, this makes no sense and
2316 * we set it to 0 to turn off stripe handling code.
2317 */
2318 if (ret <= 1)
2319 ret = 0;
c9de560d 2320
3eb08658 2321 return ret;
c9de560d 2322}
ac27a0ec 2323
3197ebdb
TT		 2324/* sysfs supprt */
2325
2326struct ext4_attr {
2327 struct attribute attr;
2328 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2329 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2330 const char *, size_t);
2331 int offset;
2332};
2333
2334static int parse_strtoul(const char *buf,
2335 unsigned long max, unsigned long *value)
2336{
2337 char *endp;
2338
e7d2860b
AGR		 2339 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2340 endp = skip_spaces(endp);
3197ebdb
TT		 2341 if (*endp || *value > max)
2342 return -EINVAL;
2343
2344 return 0;
2345}
2346
2347static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2348 struct ext4_sb_info *sbi,
2349 char *buf)
2350{
2351 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2352 (s64) EXT4_C2B(sbi,
2353 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2354}
2355
2356static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2357 struct ext4_sb_info *sbi, char *buf)
2358{
2359 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2360
f613dfcb
TT		 2361 if (!sb->s_bdev->bd_part)
2362 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2363 return snprintf(buf, PAGE_SIZE, "%lu\n",
2364 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2365 sbi->s_sectors_written_start) >> 1);
2366}
2367
2368static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2369 struct ext4_sb_info *sbi, char *buf)
2370{
2371 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2372
f613dfcb
TT		 2373 if (!sb->s_bdev->bd_part)
2374 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2375 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2376 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2377 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2378 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2379}
2380
2381static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2382 struct ext4_sb_info *sbi,
2383 const char *buf, size_t count)
2384{
2385 unsigned long t;
2386
2387 if (parse_strtoul(buf, 0x40000000, &t))
2388 return -EINVAL;
2389
5dbd571d 2390 if (t && !is_power_of_2(t))
3197ebdb
TT		 2391 return -EINVAL;
2392
2393 sbi->s_inode_readahead_blks = t;
2394 return count;
2395}
2396
2397static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2398 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2399{
2400 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2401
2402 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2403}
2404
2405static ssize_t sbi_ui_store(struct ext4_attr *a,
2406 struct ext4_sb_info *sbi,
2407 const char *buf, size_t count)
2408{
2409 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2410 unsigned long t;
2411
2412 if (parse_strtoul(buf, 0xffffffff, &t))
2413 return -EINVAL;
2414 *ui = t;
2415 return count;
2416}
2417
2418#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2419static struct ext4_attr ext4_attr_##_name = { \
2420 .attr = {.name = __stringify(_name), .mode = _mode }, \
2421 .show = _show, \
2422 .store = _store, \
2423 .offset = offsetof(struct ext4_sb_info, _elname), \
2424}
2425#define EXT4_ATTR(name, mode, show, store) \
2426static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2427
857ac889 2428#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2429#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2430#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2431#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2432 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2433#define ATTR_LIST(name) &ext4_attr_##name.attr
2434
2435EXT4_RO_ATTR(delayed_allocation_blocks);
2436EXT4_RO_ATTR(session_write_kbytes);
2437EXT4_RO_ATTR(lifetime_write_kbytes);
2438EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2439 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2440EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2441EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2442EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2443EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2444EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2445EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2446EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2447EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2448
2449static struct attribute *ext4_attrs[] = {
2450 ATTR_LIST(delayed_allocation_blocks),
2451 ATTR_LIST(session_write_kbytes),
2452 ATTR_LIST(lifetime_write_kbytes),
2453 ATTR_LIST(inode_readahead_blks),
11013911 2454 ATTR_LIST(inode_goal),
3197ebdb
TT		 2455 ATTR_LIST(mb_stats),
2456 ATTR_LIST(mb_max_to_scan),
2457 ATTR_LIST(mb_min_to_scan),
2458 ATTR_LIST(mb_order2_req),
2459 ATTR_LIST(mb_stream_req),
2460 ATTR_LIST(mb_group_prealloc),
55138e0b 2461 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2462 NULL,
2463};
2464
857ac889
LC		 2465/* Features this copy of ext4 supports */
2466EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2467EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2468
2469static struct attribute *ext4_feat_attrs[] = {
2470 ATTR_LIST(lazy_itable_init),
27ee40df 2471 ATTR_LIST(batched_discard),
857ac889
LC		 2472 NULL,
2473};
2474
3197ebdb
TT		 2475static ssize_t ext4_attr_show(struct kobject *kobj,
2476 struct attribute *attr, char *buf)
2477{
2478 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2479 s_kobj);
2480 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2481
2482 return a->show ? a->show(a, sbi, buf) : 0;
2483}
2484
2485static ssize_t ext4_attr_store(struct kobject *kobj,
2486 struct attribute *attr,
2487 const char *buf, size_t len)
2488{
2489 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2490 s_kobj);
2491 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2492
2493 return a->store ? a->store(a, sbi, buf, len) : 0;
2494}
2495
2496static void ext4_sb_release(struct kobject *kobj)
2497{
2498 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2499 s_kobj);
2500 complete(&sbi->s_kobj_unregister);
2501}
2502
52cf25d0 2503static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2504 .show = ext4_attr_show,
2505 .store = ext4_attr_store,
2506};
2507
2508static struct kobj_type ext4_ktype = {
2509 .default_attrs = ext4_attrs,
2510 .sysfs_ops = &ext4_attr_ops,
2511 .release = ext4_sb_release,
2512};
2513
857ac889
LC		 2514static void ext4_feat_release(struct kobject *kobj)
2515{
2516 complete(&ext4_feat->f_kobj_unregister);
2517}
2518
2519static struct kobj_type ext4_feat_ktype = {
2520 .default_attrs = ext4_feat_attrs,
2521 .sysfs_ops = &ext4_attr_ops,
2522 .release = ext4_feat_release,
2523};
2524
a13fb1a4
ES		 2525/*
2526 * Check whether this filesystem can be mounted based on
2527 * the features present and the RDONLY/RDWR mount requested.
2528 * Returns 1 if this filesystem can be mounted as requested,
2529 * 0 if it cannot be.
2530 */
2531static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2532{
2533 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2534 ext4_msg(sb, KERN_ERR,
2535 "Couldn't mount because of "
2536 "unsupported optional features (%x)",
2537 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2538 ~EXT4_FEATURE_INCOMPAT_SUPP));
2539 return 0;
2540 }
2541
2542 if (readonly)
2543 return 1;
2544
2545 /* Check that feature set is OK for a read-write mount */
2546 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2547 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2548 "unsupported optional features (%x)",
2549 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2550 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2551 return 0;
2552 }
2553 /*
2554 * Large file size enabled file system can only be mounted
2555 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2556 */
2557 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2558 if (sizeof(blkcnt_t) < sizeof(u64)) {
2559 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2560 "cannot be mounted RDWR without "
2561 "CONFIG_LBDAF");
2562 return 0;
2563 }
2564 }
bab08ab9
TT		 2565 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2566 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2567 ext4_msg(sb, KERN_ERR,
2568 "Can't support bigalloc feature without "
2569 "extents feature\n");
2570 return 0;
2571 }
a13fb1a4
ES		 2572 return 1;
2573}
2574
66e61a9e
TT		 2575/*
2576 * This function is called once a day if we have errors logged
2577 * on the file system
2578 */
2579static void print_daily_error_info(unsigned long arg)
2580{
2581 struct super_block *sb = (struct super_block *) arg;
2582 struct ext4_sb_info *sbi;
2583 struct ext4_super_block *es;
2584
2585 sbi = EXT4_SB(sb);
2586 es = sbi->s_es;
2587
2588 if (es->s_error_count)
2589 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2590 le32_to_cpu(es->s_error_count));
2591 if (es->s_first_error_time) {
2592 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2593 sb->s_id, le32_to_cpu(es->s_first_error_time),
2594 (int) sizeof(es->s_first_error_func),
2595 es->s_first_error_func,
2596 le32_to_cpu(es->s_first_error_line));
2597 if (es->s_first_error_ino)
2598 printk(": inode %u",
2599 le32_to_cpu(es->s_first_error_ino));
2600 if (es->s_first_error_block)
2601 printk(": block %llu", (unsigned long long)
2602 le64_to_cpu(es->s_first_error_block));
2603 printk("\n");
2604 }
2605 if (es->s_last_error_time) {
2606 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2607 sb->s_id, le32_to_cpu(es->s_last_error_time),
2608 (int) sizeof(es->s_last_error_func),
2609 es->s_last_error_func,
2610 le32_to_cpu(es->s_last_error_line));
2611 if (es->s_last_error_ino)
2612 printk(": inode %u",
2613 le32_to_cpu(es->s_last_error_ino));
2614 if (es->s_last_error_block)
2615 printk(": block %llu", (unsigned long long)
2616 le64_to_cpu(es->s_last_error_block));
2617 printk("\n");
2618 }
2619 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2620}
2621
bfff6873
LC		 2622/* Find next suitable group and run ext4_init_inode_table */
2623static int ext4_run_li_request(struct ext4_li_request *elr)
2624{
2625 struct ext4_group_desc *gdp = NULL;
2626 ext4_group_t group, ngroups;
2627 struct super_block *sb;
2628 unsigned long timeout = 0;
2629 int ret = 0;
2630
2631 sb = elr->lr_super;
2632 ngroups = EXT4_SB(sb)->s_groups_count;
2633
2634 for (group = elr->lr_next_group; group < ngroups; group++) {
2635 gdp = ext4_get_group_desc(sb, group, NULL);
2636 if (!gdp) {
2637 ret = 1;
2638 break;
2639 }
2640
2641 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2642 break;
2643 }
2644
2645 if (group == ngroups)
2646 ret = 1;
2647
2648 if (!ret) {
2649 timeout = jiffies;
2650 ret = ext4_init_inode_table(sb, group,
2651 elr->lr_timeout ? 0 : 1);
2652 if (elr->lr_timeout == 0) {
51ce6511
LC		 2653 timeout = (jiffies - timeout) *
2654 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2655 elr->lr_timeout = timeout;
2656 }
2657 elr->lr_next_sched = jiffies + elr->lr_timeout;
2658 elr->lr_next_group = group + 1;
2659 }
2660
2661 return ret;
2662}
2663
2664/*
2665 * Remove lr_request from the list_request and free the
4ed5c033 2666 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2667 */
2668static void ext4_remove_li_request(struct ext4_li_request *elr)
2669{
2670 struct ext4_sb_info *sbi;
2671
2672 if (!elr)
2673 return;
2674
2675 sbi = elr->lr_sbi;
2676
2677 list_del(&elr->lr_request);
2678 sbi->s_li_request = NULL;
2679 kfree(elr);
2680}
2681
2682static void ext4_unregister_li_request(struct super_block *sb)
2683{
1bb933fb
LC		 2684 mutex_lock(&ext4_li_mtx);
2685 if (!ext4_li_info) {
2686 mutex_unlock(&ext4_li_mtx);
bfff6873 2687 return;
1bb933fb 2688 }
bfff6873
LC		 2689
2690 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2691 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2692 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2693 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2694}
2695
8f1f7453
ES		 2696static struct task_struct *ext4_lazyinit_task;
2697
bfff6873
LC		 2698/*
2699 * This is the function where ext4lazyinit thread lives. It walks
2700 * through the request list searching for next scheduled filesystem.
2701 * When such a fs is found, run the lazy initialization request
2702 * (ext4_rn_li_request) and keep track of the time spend in this
2703 * function. Based on that time we compute next schedule time of
2704 * the request. When walking through the list is complete, compute
2705 * next waking time and put itself into sleep.
2706 */
2707static int ext4_lazyinit_thread(void *arg)
2708{
2709 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2710 struct list_head *pos, *n;
2711 struct ext4_li_request *elr;
4ed5c033 2712 unsigned long next_wakeup, cur;
bfff6873
LC		 2713
2714 BUG_ON(NULL == eli);
2715
bfff6873
LC		 2716cont_thread:
2717 while (true) {
2718 next_wakeup = MAX_JIFFY_OFFSET;
2719
2720 mutex_lock(&eli->li_list_mtx);
2721 if (list_empty(&eli->li_request_list)) {
2722 mutex_unlock(&eli->li_list_mtx);
2723 goto exit_thread;
2724 }
2725
2726 list_for_each_safe(pos, n, &eli->li_request_list) {
2727 elr = list_entry(pos, struct ext4_li_request,
2728 lr_request);
2729
b2c78cd0
TT		 2730 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2731 if (ext4_run_li_request(elr) != 0) {
2732 /* error, remove the lazy_init job */
2733 ext4_remove_li_request(elr);
2734 continue;
2735 }
bfff6873
LC		 2736 }
2737
2738 if (time_before(elr->lr_next_sched, next_wakeup))
2739 next_wakeup = elr->lr_next_sched;
2740 }
2741 mutex_unlock(&eli->li_list_mtx);
2742
a0acae0e 2743 try_to_freeze();
bfff6873 2744
4ed5c033
LC		 2745 cur = jiffies;
2746 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2747 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2748 cond_resched();
2749 continue;
2750 }
2751
4ed5c033
LC		 2752 schedule_timeout_interruptible(next_wakeup - cur);
2753
8f1f7453
ES		 2754 if (kthread_should_stop()) {
2755 ext4_clear_request_list();
2756 goto exit_thread;
2757 }
bfff6873
LC		 2758 }
2759
2760exit_thread:
2761 /*
2762 * It looks like the request list is empty, but we need
2763 * to check it under the li_list_mtx lock, to prevent any
2764 * additions into it, and of course we should lock ext4_li_mtx
2765 * to atomically free the list and ext4_li_info, because at
2766 * this point another ext4 filesystem could be registering
2767 * new one.
2768 */
2769 mutex_lock(&ext4_li_mtx);
2770 mutex_lock(&eli->li_list_mtx);
2771 if (!list_empty(&eli->li_request_list)) {
2772 mutex_unlock(&eli->li_list_mtx);
2773 mutex_unlock(&ext4_li_mtx);
2774 goto cont_thread;
2775 }
2776 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2777 kfree(ext4_li_info);
2778 ext4_li_info = NULL;
2779 mutex_unlock(&ext4_li_mtx);
2780
2781 return 0;
2782}
2783
2784static void ext4_clear_request_list(void)
2785{
2786 struct list_head *pos, *n;
2787 struct ext4_li_request *elr;
2788
2789 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2790 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2791 elr = list_entry(pos, struct ext4_li_request,
2792 lr_request);
2793 ext4_remove_li_request(elr);
2794 }
2795 mutex_unlock(&ext4_li_info->li_list_mtx);
2796}
2797
2798static int ext4_run_lazyinit_thread(void)
2799{
8f1f7453
ES		 2800 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2801 ext4_li_info, "ext4lazyinit");
2802 if (IS_ERR(ext4_lazyinit_task)) {
2803 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2804 ext4_clear_request_list();
bfff6873
LC		 2805 kfree(ext4_li_info);
2806 ext4_li_info = NULL;
92b97816 2807 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2808 "initialization thread\n",
2809 err);
2810 return err;
2811 }
2812 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2813 return 0;
2814}
2815
2816/*
2817 * Check whether it make sense to run itable init. thread or not.
2818 * If there is at least one uninitialized inode table, return
2819 * corresponding group number, else the loop goes through all
2820 * groups and return total number of groups.
2821 */
2822static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2823{
2824 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2825 struct ext4_group_desc *gdp = NULL;
2826
2827 for (group = 0; group < ngroups; group++) {
2828 gdp = ext4_get_group_desc(sb, group, NULL);
2829 if (!gdp)
2830 continue;
2831
2832 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2833 break;
2834 }
2835
2836 return group;
2837}
2838
2839static int ext4_li_info_new(void)
2840{
2841 struct ext4_lazy_init *eli = NULL;
2842
2843 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2844 if (!eli)
2845 return -ENOMEM;
2846
bfff6873
LC		 2847 INIT_LIST_HEAD(&eli->li_request_list);
2848 mutex_init(&eli->li_list_mtx);
2849
bfff6873
LC		 2850 eli->li_state |= EXT4_LAZYINIT_QUIT;
2851
2852 ext4_li_info = eli;
2853
2854 return 0;
2855}
2856
2857static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2858 ext4_group_t start)
2859{
2860 struct ext4_sb_info *sbi = EXT4_SB(sb);
2861 struct ext4_li_request *elr;
2862 unsigned long rnd;
2863
2864 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2865 if (!elr)
2866 return NULL;
2867
2868 elr->lr_super = sb;
2869 elr->lr_sbi = sbi;
2870 elr->lr_next_group = start;
2871
2872 /*
2873 * Randomize first schedule time of the request to
2874 * spread the inode table initialization requests
2875 * better.
2876 */
2877 get_random_bytes(&rnd, sizeof(rnd));
2878 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2879 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2880
2881 return elr;
2882}
2883
2884static int ext4_register_li_request(struct super_block *sb,
2885 ext4_group_t first_not_zeroed)
2886{
2887 struct ext4_sb_info *sbi = EXT4_SB(sb);
2888 struct ext4_li_request *elr;
2889 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2890 int ret = 0;
bfff6873 2891
51ce6511
LC		 2892 if (sbi->s_li_request != NULL) {
2893 /*
2894 * Reset timeout so it can be computed again, because
2895 * s_li_wait_mult might have changed.
2896 */
2897 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2898 return 0;
51ce6511 2899 }
bfff6873
LC		 2900
2901 if (first_not_zeroed == ngroups ||
2902 (sb->s_flags & MS_RDONLY) ||
55ff3840 2903 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 2904 return 0;
bfff6873
LC		 2905
2906 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 2907 if (!elr)
2908 return -ENOMEM;
bfff6873
LC		 2909
2910 mutex_lock(&ext4_li_mtx);
2911
2912 if (NULL == ext4_li_info) {
2913 ret = ext4_li_info_new();
2914 if (ret)
2915 goto out;
2916 }
2917
2918 mutex_lock(&ext4_li_info->li_list_mtx);
2919 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2920 mutex_unlock(&ext4_li_info->li_list_mtx);
2921
2922 sbi->s_li_request = elr;
46e4690b
TM		 2923 /*
2924 * set elr to NULL here since it has been inserted to
2925 * the request_list and the removal and free of it is
2926 * handled by ext4_clear_request_list from now on.
2927 */
2928 elr = NULL;
bfff6873
LC		 2929
2930 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2931 ret = ext4_run_lazyinit_thread();
2932 if (ret)
2933 goto out;
2934 }
bfff6873 2935out:
beed5ecb
NK		 2936 mutex_unlock(&ext4_li_mtx);
2937 if (ret)
bfff6873 2938 kfree(elr);
bfff6873
LC		 2939 return ret;
2940}
2941
2942/*
2943 * We do not need to lock anything since this is called on
2944 * module unload.
2945 */
2946static void ext4_destroy_lazyinit_thread(void)
2947{
2948 /*
2949 * If thread exited earlier
2950 * there's nothing to be done.
2951 */
8f1f7453 2952 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2953 return;
2954
8f1f7453 2955 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2956}
2957
2b2d6d01 2958static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 2959{
d4c402d9 2960 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 2961 struct buffer_head *bh;
617ba13b
MC		 2962 struct ext4_super_block *es = NULL;
2963 struct ext4_sb_info *sbi;
2964 ext4_fsblk_t block;
2965 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2966 ext4_fsblk_t logical_sb_block;
ac27a0ec 2967 unsigned long offset = 0;
ac27a0ec
DK		 2968 unsigned long journal_devnum = 0;
2969 unsigned long def_mount_opts;
2970 struct inode *root;
9f6200bb 2971 char *cp;
0390131b 2972 const char *descr;
dcc7dae3 2973 int ret = -ENOMEM;
281b5995 2974 int blocksize, clustersize;
4ec11028
TT		 2975 unsigned int db_count;
2976 unsigned int i;
281b5995 2977 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 2978 __u64 blocks_count;
833f4077 2979 int err;
b3881f74 2980 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 2981 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 2982
2983 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2984 if (!sbi)
dcc7dae3 2985 goto out_free_orig;
705895b6
PE		 2986
2987 sbi->s_blockgroup_lock =
2988 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2989 if (!sbi->s_blockgroup_lock) {
2990 kfree(sbi);
dcc7dae3 2991 goto out_free_orig;
705895b6 2992 }
ac27a0ec
DK		 2993 sb->s_fs_info = sbi;
2994 sbi->s_mount_opt = 0;
617ba13b
MC		 2995 sbi->s_resuid = EXT4_DEF_RESUID;
2996 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2997 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2998 sbi->s_sb_block = sb_block;
f613dfcb
TT		 2999 if (sb->s_bdev->bd_part)
3000 sbi->s_sectors_written_start =
3001 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3002
9f6200bb
TT		 3003 /* Cleanup superblock name */
3004 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3005 *cp = '!';
3006
dcc7dae3 3007 ret = -EINVAL;
617ba13b 3008 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3009 if (!blocksize) {
b31e1552 3010 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3011 goto out_fail;
3012 }
3013
3014 /*
617ba13b 3015 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3016 * block sizes. We need to calculate the offset from buffer start.
3017 */
617ba13b 3018 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3019 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3020 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3021 } else {
70bbb3e0 3022 logical_sb_block = sb_block;
ac27a0ec
DK		 3023 }
3024
70bbb3e0 3025 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3026 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3027 goto out_fail;
3028 }
3029 /*
3030 * Note: s_es must be initialized as soon as possible because
617ba13b 3031 * some ext4 macro-instructions depend on its value
ac27a0ec 3032 */
617ba13b 3033 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3034 sbi->s_es = es;
3035 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3036 if (sb->s_magic != EXT4_SUPER_MAGIC)
3037 goto cantfind_ext4;
afc32f7e 3038 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3039
d25425f8
DW		 3040 /* Check for a known checksum algorithm */
3041 if (!ext4_verify_csum_type(sb, es)) {
3042 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3043 "unknown checksum algorithm.");
3044 silent = 1;
3045 goto cantfind_ext4;
3046 }
3047
0441984a
DW		 3048 /* Load the checksum driver */
3049 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3050 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3051 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3052 if (IS_ERR(sbi->s_chksum_driver)) {
3053 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3054 ret = PTR_ERR(sbi->s_chksum_driver);
3055 sbi->s_chksum_driver = NULL;
3056 goto failed_mount;
3057 }
3058 }
3059
ac27a0ec
DK		 3060 /* Set defaults before we parse the mount options */
3061 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3062 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3063 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3064 set_opt(sb, DEBUG);
87f26807 3065 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3066 set_opt(sb, GRPID);
617ba13b 3067 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3068 set_opt(sb, NO_UID32);
ea663336 3069 /* xattr user namespace & acls are now defaulted on */
03010a33 3070#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3071 set_opt(sb, XATTR_USER);
2e7842b8 3072#endif
03010a33 3073#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3074 set_opt(sb, POSIX_ACL);
2e7842b8 3075#endif
6fd7a467 3076 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3077 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3078 set_opt(sb, JOURNAL_DATA);
617ba13b 3079 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3080 set_opt(sb, ORDERED_DATA);
617ba13b 3081 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3082 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3083
3084 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3085 set_opt(sb, ERRORS_PANIC);
bb4f397a 3086 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3087 set_opt(sb, ERRORS_CONT);
bb4f397a 3088 else
fd8c37ec 3089 set_opt(sb, ERRORS_RO);
8b67f04a 3090 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3091 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3092 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3093 set_opt(sb, DISCARD);
ac27a0ec
DK		 3094
3095 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3096 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3097 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3098 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3099 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3100
8b67f04a 3101 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3102 set_opt(sb, BARRIER);
ac27a0ec 3103
dd919b98
AK		 3104 /*
3105 * enable delayed allocation by default
3106 * Use -o nodelalloc to turn it off
3107 */
8b67f04a
TT		 3108 if (!IS_EXT3_SB(sb) &&
3109 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3110 set_opt(sb, DELALLOC);
dd919b98 3111
51ce6511
LC		 3112 /*
3113 * set default s_li_wait_mult for lazyinit, for the case there is
3114 * no mount option specified.
3115 */
3116 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3117
8b67f04a 3118 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3119 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3120 ext4_msg(sb, KERN_WARNING,
3121 "failed to parse options in superblock: %s",
3122 sbi->s_es->s_mount_opts);
3123 }
5a916be1 3124 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3125 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3126 &journal_ioprio, 0))
ac27a0ec
DK		 3127 goto failed_mount;
3128
56889787
TT		 3129 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3130 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3131 "with data=journal disables delayed "
3132 "allocation and O_DIRECT support!\n");
3133 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3134 ext4_msg(sb, KERN_ERR, "can't mount with "
3135 "both data=journal and delalloc");
3136 goto failed_mount;
3137 }
3138 if (test_opt(sb, DIOREAD_NOLOCK)) {
3139 ext4_msg(sb, KERN_ERR, "can't mount with "
3140 "both data=journal and delalloc");
3141 goto failed_mount;
3142 }
3143 if (test_opt(sb, DELALLOC))
3144 clear_opt(sb, DELALLOC);
3145 }
3146
3147 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3148 if (test_opt(sb, DIOREAD_NOLOCK)) {
3149 if (blocksize < PAGE_SIZE) {
3150 ext4_msg(sb, KERN_ERR, "can't mount with "
3151 "dioread_nolock if block size != PAGE_SIZE");
3152 goto failed_mount;
3153 }
3154 }
3155
ac27a0ec 3156 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3157 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3158
617ba13b
MC		 3159 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3160 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3161 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3162 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3163 ext4_msg(sb, KERN_WARNING,
3164 "feature flags set on rev 0 fs, "
3165 "running e2fsck is recommended");
469108ff 3166
2035e776
TT		 3167 if (IS_EXT2_SB(sb)) {
3168 if (ext2_feature_set_ok(sb))
3169 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3170 "using the ext4 subsystem");
3171 else {
3172 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3173 "to feature incompatibilities");
3174 goto failed_mount;
3175 }
3176 }
3177
3178 if (IS_EXT3_SB(sb)) {
3179 if (ext3_feature_set_ok(sb))
3180 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3181 "using the ext4 subsystem");
3182 else {
3183 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3184 "to feature incompatibilities");
3185 goto failed_mount;
3186 }
3187 }
3188
ac27a0ec
DK		 3189 /*
3190 * Check feature flags regardless of the revision level, since we
3191 * previously didn't change the revision level when setting the flags,
3192 * so there is a chance incompat flags are set on a rev 0 filesystem.
3193 */
a13fb1a4 3194 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3195 goto failed_mount;
a13fb1a4 3196
617ba13b
MC		 3197 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3198 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3199 ext4_msg(sb, KERN_ERR,
3200 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3201 goto failed_mount;
3202 }
3203
ac27a0ec 3204 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3205 /* Validate the filesystem blocksize */
3206 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3207 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3208 blocksize);
ac27a0ec
DK		 3209 goto failed_mount;
3210 }
3211
2b2d6d01 3212 brelse(bh);
70bbb3e0
AM		 3213 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3214 offset = do_div(logical_sb_block, blocksize);
3215 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3216 if (!bh) {
b31e1552
ES		 3217 ext4_msg(sb, KERN_ERR,
3218 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3219 goto failed_mount;
3220 }
617ba13b 3221 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3222 sbi->s_es = es;
617ba13b 3223 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3224 ext4_msg(sb, KERN_ERR,
3225 "Magic mismatch, very weird!");
ac27a0ec
DK		 3226 goto failed_mount;
3227 }
3228 }
3229
a13fb1a4
ES		 3230 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3231 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3232 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3233 has_huge_files);
3234 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3235
617ba13b
MC		 3236 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3237 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3238 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3239 } else {
3240 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3241 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3242 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3243 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3244 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3245 ext4_msg(sb, KERN_ERR,
3246 "unsupported inode size: %d",
2b2d6d01 3247 sbi->s_inode_size);
ac27a0ec
DK		 3248 goto failed_mount;
3249 }
ef7f3835
KS		 3250 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3251 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3252 }
0b8e58a1 3253
0d1ee42f
AR		 3254 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3255 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3256 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3257 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3258 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3259 ext4_msg(sb, KERN_ERR,
3260 "unsupported descriptor size %lu",
0d1ee42f
AR		 3261 sbi->s_desc_size);
3262 goto failed_mount;
3263 }
3264 } else
3265 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3266
ac27a0ec 3267 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3268 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3269 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3270 goto cantfind_ext4;
0b8e58a1 3271
617ba13b 3272 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3273 if (sbi->s_inodes_per_block == 0)
617ba13b 3274 goto cantfind_ext4;
ac27a0ec
DK		 3275 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3276 sbi->s_inodes_per_block;
0d1ee42f 3277 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3278 sbi->s_sbh = bh;
3279 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3280 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3281 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3282
2b2d6d01 3283 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3284 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3285 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3286 i = le32_to_cpu(es->s_flags);
3287 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3288 sbi->s_hash_unsigned = 3;
3289 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3290#ifdef __CHAR_UNSIGNED__
3291 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3292 sbi->s_hash_unsigned = 3;
3293#else
3294 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3295#endif
f99b2589 3296 }
ac27a0ec 3297
281b5995
TT		 3298 /* Handle clustersize */
3299 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3300 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3301 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3302 if (has_bigalloc) {
3303 if (clustersize < blocksize) {
3304 ext4_msg(sb, KERN_ERR,
3305 "cluster size (%d) smaller than "
3306 "block size (%d)", clustersize, blocksize);
3307 goto failed_mount;
3308 }
3309 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3310 le32_to_cpu(es->s_log_block_size);
3311 sbi->s_clusters_per_group =
3312 le32_to_cpu(es->s_clusters_per_group);
3313 if (sbi->s_clusters_per_group > blocksize * 8) {
3314 ext4_msg(sb, KERN_ERR,
3315 "#clusters per group too big: %lu",
3316 sbi->s_clusters_per_group);
3317 goto failed_mount;
3318 }
3319 if (sbi->s_blocks_per_group !=
3320 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3321 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3322 "clusters per group (%lu) inconsistent",
3323 sbi->s_blocks_per_group,
3324 sbi->s_clusters_per_group);
3325 goto failed_mount;
3326 }
3327 } else {
3328 if (clustersize != blocksize) {
3329 ext4_warning(sb, "fragment/cluster size (%d) != "
3330 "block size (%d)", clustersize,
3331 blocksize);
3332 clustersize = blocksize;
3333 }
3334 if (sbi->s_blocks_per_group > blocksize * 8) {
3335 ext4_msg(sb, KERN_ERR,
3336 "#blocks per group too big: %lu",
3337 sbi->s_blocks_per_group);
3338 goto failed_mount;
3339 }
3340 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3341 sbi->s_cluster_bits = 0;
ac27a0ec 3342 }
281b5995
TT		 3343 sbi->s_cluster_ratio = clustersize / blocksize;
3344
ac27a0ec 3345 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3346 ext4_msg(sb, KERN_ERR,
3347 "#inodes per group too big: %lu",
2b2d6d01 3348 sbi->s_inodes_per_group);
ac27a0ec
DK		 3349 goto failed_mount;
3350 }
3351
bf43d84b
ES		 3352 /*
3353 * Test whether we have more sectors than will fit in sector_t,
3354 * and whether the max offset is addressable by the page cache.
3355 */
5a9ae68a 3356 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3357 ext4_blocks_count(es));
5a9ae68a 3358 if (err) {
b31e1552 3359 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3360 " too large to mount safely on this system");
ac27a0ec 3361 if (sizeof(sector_t) < 8)
90c699a9 3362 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3363 ret = err;
ac27a0ec
DK		 3364 goto failed_mount;
3365 }
3366
617ba13b
MC		 3367 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3368 goto cantfind_ext4;
e7c95593 3369
0f2ddca6
FTN		 3370 /* check blocks count against device size */
3371 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3372 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3373 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3374 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3375 ext4_blocks_count(es), blocks_count);
3376 goto failed_mount;
3377 }
3378
0b8e58a1
AD		 3379 /*
3380 * It makes no sense for the first data block to be beyond the end
3381 * of the filesystem.
3382 */
3383 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3384 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3385 "block %u is beyond end of filesystem (%llu)",
3386 le32_to_cpu(es->s_first_data_block),
3387 ext4_blocks_count(es));
e7c95593
ES		 3388 goto failed_mount;
3389 }
bd81d8ee
LV		 3390 blocks_count = (ext4_blocks_count(es) -
3391 le32_to_cpu(es->s_first_data_block) +
3392 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3393 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3394 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3395 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3396 "(block count %llu, first data block %u, "
b31e1552 3397 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3398 ext4_blocks_count(es),
3399 le32_to_cpu(es->s_first_data_block),
3400 EXT4_BLOCKS_PER_GROUP(sb));
3401 goto failed_mount;
3402 }
bd81d8ee 3403 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3404 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3405 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3406 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3407 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3408 sbi->s_group_desc = ext4_kvmalloc(db_count *
3409 sizeof(struct buffer_head *),
3410 GFP_KERNEL);
ac27a0ec 3411 if (sbi->s_group_desc == NULL) {
b31e1552 3412 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3413 goto failed_mount;
3414 }
3415
9f6200bb
TT		 3416 if (ext4_proc_root)
3417 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3418
66acdcf4
TT		 3419 if (sbi->s_proc)
3420 proc_create_data("options", S_IRUGO, sbi->s_proc,
3421 &ext4_seq_options_fops, sb);
3422
705895b6 3423 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3424
3425 for (i = 0; i < db_count; i++) {
70bbb3e0 3426 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3427 sbi->s_group_desc[i] = sb_bread(sb, block);
3428 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3429 ext4_msg(sb, KERN_ERR,
3430 "can't read group descriptor %d", i);
ac27a0ec
DK		 3431 db_count = i;
3432 goto failed_mount2;
3433 }
3434 }
bfff6873 3435 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3436 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3437 goto failed_mount2;
3438 }
772cb7c8
JS		 3439 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3440 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3441 ext4_msg(sb, KERN_ERR,
3442 "unable to initialize "
3443 "flex_bg meta info!");
772cb7c8
JS		 3444 goto failed_mount2;
3445 }
3446
ac27a0ec
DK		 3447 sbi->s_gdb_count = db_count;
3448 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3449 spin_lock_init(&sbi->s_next_gen_lock);
3450
04496411
TM		 3451 init_timer(&sbi->s_err_report);
3452 sbi->s_err_report.function = print_daily_error_info;
3453 sbi->s_err_report.data = (unsigned long) sb;
3454
57042651 3455 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3456 ext4_count_free_clusters(sb));
ce7e010a
TT		 3457 if (!err) {
3458 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3459 ext4_count_free_inodes(sb));
3460 }
3461 if (!err) {
3462 err = percpu_counter_init(&sbi->s_dirs_counter,
3463 ext4_count_dirs(sb));
3464 }
3465 if (!err) {
57042651 3466 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3467 }
3468 if (err) {
3469 ext4_msg(sb, KERN_ERR, "insufficient memory");
3470 goto failed_mount3;
3471 }
3472
c9de560d 3473 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3474 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3475
ac27a0ec
DK		 3476 /*
3477 * set up enough so that it can read an inode
3478 */
9ca92389
TT		 3479 if (!test_opt(sb, NOLOAD) &&
3480 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3481 sb->s_op = &ext4_sops;
3482 else
3483 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3484 sb->s_export_op = &ext4_export_ops;
3485 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3486#ifdef CONFIG_QUOTA
617ba13b
MC		 3487 sb->s_qcop = &ext4_qctl_operations;
3488 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3489#endif
f2fa2ffc
AK		 3490 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3491
ac27a0ec 3492 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3493 mutex_init(&sbi->s_orphan_lock);
8f82f840 3494 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3495
3496 sb->s_root = NULL;
3497
3498 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3499 EXT4_HAS_INCOMPAT_FEATURE(sb,
3500 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3501
c5e06d10
JL		 3502 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3503 !(sb->s_flags & MS_RDONLY))
3504 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3505 goto failed_mount3;
3506
ac27a0ec
DK		 3507 /*
3508 * The first inode we look at is the journal inode. Don't try
3509 * root first: it may be modified in the journal!
3510 */
3511 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3512 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3513 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3514 goto failed_mount3;
0390131b
FM		 3515 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3516 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3517 ext4_msg(sb, KERN_ERR, "required journal recovery "
3518 "suppressed and not mounted read-only");
744692dc 3519 goto failed_mount_wq;
ac27a0ec 3520 } else {
fd8c37ec 3521 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3522 sbi->s_journal = NULL;
3523 needs_recovery = 0;
3524 goto no_journal;
ac27a0ec
DK		 3525 }
3526
eb40a09c
JS		 3527 if (ext4_blocks_count(es) > 0xffffffffULL &&
3528 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3529 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3530 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3531 goto failed_mount_wq;
eb40a09c
JS		 3532 }
3533
d4da6c9c
LT		 3534 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3535 jbd2_journal_set_features(sbi->s_journal,
3536 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3537 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3538 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3539 jbd2_journal_set_features(sbi->s_journal,
3540 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3541 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3542 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3543 } else {
3544 jbd2_journal_clear_features(sbi->s_journal,
3545 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3546 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3547 }
818d276c 3548
ac27a0ec
DK		 3549 /* We have now updated the journal if required, so we can
3550 * validate the data journaling mode. */
3551 switch (test_opt(sb, DATA_FLAGS)) {
3552 case 0:
3553 /* No mode set, assume a default based on the journal
63f57933
AM		 3554 * capabilities: ORDERED_DATA if the journal can
3555 * cope, else JOURNAL_DATA
3556 */
dab291af
MC		 3557 if (jbd2_journal_check_available_features
3558 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3559 set_opt(sb, ORDERED_DATA);
ac27a0ec 3560 else
fd8c37ec 3561 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3562 break;
3563
617ba13b
MC		 3564 case EXT4_MOUNT_ORDERED_DATA:
3565 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3566 if (!jbd2_journal_check_available_features
3567 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3568 ext4_msg(sb, KERN_ERR, "Journal does not support "
3569 "requested data journaling mode");
744692dc 3570 goto failed_mount_wq;
ac27a0ec
DK		 3571 }
3572 default:
3573 break;
3574 }
b3881f74 3575 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3576
18aadd47
BJ		 3577 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3578
ce7e010a
TT		 3579 /*
3580 * The journal may have updated the bg summary counts, so we
3581 * need to update the global counters.
3582 */
57042651 3583 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3584 ext4_count_free_clusters(sb));
ce7e010a
TT		 3585 percpu_counter_set(&sbi->s_freeinodes_counter,
3586 ext4_count_free_inodes(sb));
3587 percpu_counter_set(&sbi->s_dirs_counter,
3588 ext4_count_dirs(sb));
57042651 3589 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3590
ce7e010a 3591no_journal:
fd89d5f2
TH		 3592 /*
3593 * The maximum number of concurrent works can be high and
3594 * concurrency isn't really necessary. Limit it to 1.
3595 */
3596 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3597 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3598 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3599 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3600 goto failed_mount_wq;
3601 }
3602
ac27a0ec 3603 /*
dab291af 3604 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3605 * so we can safely mount the rest of the filesystem now.
3606 */
3607
1d1fe1ee
DH		 3608 root = ext4_iget(sb, EXT4_ROOT_INO);
3609 if (IS_ERR(root)) {
b31e1552 3610 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3611 ret = PTR_ERR(root);
32a9bb57 3612 root = NULL;
ac27a0ec
DK		 3613 goto failed_mount4;
3614 }
3615 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3616 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3617 iput(root);
ac27a0ec
DK		 3618 goto failed_mount4;
3619 }
48fde701 3620 sb->s_root = d_make_root(root);
1d1fe1ee 3621 if (!sb->s_root) {
b31e1552 3622 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3623 ret = -ENOMEM;
3624 goto failed_mount4;
3625 }
ac27a0ec 3626
2b2d6d01 3627 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3628
3629 /* determine the minimum size of new large inodes, if present */
3630 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3631 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3632 EXT4_GOOD_OLD_INODE_SIZE;
3633 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3634 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3635 if (sbi->s_want_extra_isize <
3636 le16_to_cpu(es->s_want_extra_isize))
3637 sbi->s_want_extra_isize =
3638 le16_to_cpu(es->s_want_extra_isize);
3639 if (sbi->s_want_extra_isize <
3640 le16_to_cpu(es->s_min_extra_isize))
3641 sbi->s_want_extra_isize =
3642 le16_to_cpu(es->s_min_extra_isize);
3643 }
3644 }
3645 /* Check if enough inode space is available */
3646 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3647 sbi->s_inode_size) {
3648 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3649 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3650 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3651 "available");
ef7f3835
KS		 3652 }
3653
6fd058f7
TT		 3654 err = ext4_setup_system_zone(sb);
3655 if (err) {
b31e1552 3656 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3657 "zone (%d)", err);
94bf608a 3658 goto failed_mount4a;
6fd058f7
TT		 3659 }
3660
c2774d84
AK		 3661 ext4_ext_init(sb);
3662 err = ext4_mb_init(sb, needs_recovery);
3663 if (err) {
421f91d2 3664 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3665 err);
dcf2d804 3666 goto failed_mount5;
c2774d84
AK		 3667 }
3668
bfff6873
LC		 3669 err = ext4_register_li_request(sb, first_not_zeroed);
3670 if (err)
dcf2d804 3671 goto failed_mount6;
bfff6873 3672
3197ebdb
TT		 3673 sbi->s_kobj.kset = ext4_kset;
3674 init_completion(&sbi->s_kobj_unregister);
3675 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3676 "%s", sb->s_id);
dcf2d804
TM		 3677 if (err)
3678 goto failed_mount7;
3197ebdb 3679
617ba13b
MC		 3680 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3681 ext4_orphan_cleanup(sb, es);
3682 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3683 if (needs_recovery) {
b31e1552 3684 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3685 ext4_mark_recovery_complete(sb, es);
3686 }
3687 if (EXT4_SB(sb)->s_journal) {
3688 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3689 descr = " journalled data mode";
3690 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3691 descr = " ordered data mode";
3692 else
3693 descr = " writeback data mode";
3694 } else
3695 descr = "out journal";
3696
d4c402d9 3697 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3698 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3699 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3700
66e61a9e
TT		 3701 if (es->s_error_count)
3702 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3703
d4c402d9 3704 kfree(orig_data);
ac27a0ec
DK		 3705 return 0;
3706
617ba13b 3707cantfind_ext4:
ac27a0ec 3708 if (!silent)
b31e1552 3709 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3710 goto failed_mount;
3711
dcf2d804
TM		 3712failed_mount7:
3713 ext4_unregister_li_request(sb);
3714failed_mount6:
dcf2d804 3715 ext4_mb_release(sb);
94bf608a
AV		 3716failed_mount5:
3717 ext4_ext_release(sb);
dcf2d804 3718 ext4_release_system_zone(sb);
94bf608a
AV		 3719failed_mount4a:
3720 dput(sb->s_root);
32a9bb57 3721 sb->s_root = NULL;
94bf608a 3722failed_mount4:
b31e1552 3723 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3724 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3725failed_mount_wq:
0390131b
FM		 3726 if (sbi->s_journal) {
3727 jbd2_journal_destroy(sbi->s_journal);
3728 sbi->s_journal = NULL;
3729 }
ac27a0ec 3730failed_mount3:
04496411 3731 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3732 if (sbi->s_flex_groups)
3733 ext4_kvfree(sbi->s_flex_groups);
57042651 3734 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3735 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3736 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3737 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3738 if (sbi->s_mmp_tsk)
3739 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3740failed_mount2:
3741 for (i = 0; i < db_count; i++)
3742 brelse(sbi->s_group_desc[i]);
f18a5f21 3743 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3744failed_mount:
0441984a
DW		 3745 if (sbi->s_chksum_driver)
3746 crypto_free_shash(sbi->s_chksum_driver);
240799cd 3747 if (sbi->s_proc) {
66acdcf4 3748 remove_proc_entry("options", sbi->s_proc);
9f6200bb 3749 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3750 }
ac27a0ec
DK		 3751#ifdef CONFIG_QUOTA
3752 for (i = 0; i < MAXQUOTAS; i++)
3753 kfree(sbi->s_qf_names[i]);
3754#endif
617ba13b 3755 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3756 brelse(bh);
3757out_fail:
3758 sb->s_fs_info = NULL;
f6830165 3759 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3760 kfree(sbi);
dcc7dae3 3761out_free_orig:
d4c402d9 3762 kfree(orig_data);
1d1fe1ee 3763 return ret;
ac27a0ec
DK		 3764}
3765
3766/*
3767 * Setup any per-fs journal parameters now. We'll do this both on
3768 * initial mount, once the journal has been initialised but before we've
3769 * done any recovery; and again on any subsequent remount.
3770 */
617ba13b 3771static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3772{
617ba13b 3773 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3774
30773840
TT		 3775 journal->j_commit_interval = sbi->s_commit_interval;
3776 journal->j_min_batch_time = sbi->s_min_batch_time;
3777 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3778
a931da6a 3779 write_lock(&journal->j_state_lock);
ac27a0ec 3780 if (test_opt(sb, BARRIER))
dab291af 3781 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3782 else
dab291af 3783 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3784 if (test_opt(sb, DATA_ERR_ABORT))
3785 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3786 else
3787 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3788 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3789}
3790
617ba13b 3791static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3792 unsigned int journal_inum)
3793{
3794 struct inode *journal_inode;
3795 journal_t *journal;
3796
0390131b
FM		 3797 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3798
ac27a0ec
DK		 3799 /* First, test for the existence of a valid inode on disk. Bad
3800 * things happen if we iget() an unused inode, as the subsequent
3801 * iput() will try to delete it. */
3802
1d1fe1ee
DH		 3803 journal_inode = ext4_iget(sb, journal_inum);
3804 if (IS_ERR(journal_inode)) {
b31e1552 3805 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3806 return NULL;
3807 }
3808 if (!journal_inode->i_nlink) {
3809 make_bad_inode(journal_inode);
3810 iput(journal_inode);
b31e1552 3811 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3812 return NULL;
3813 }
3814
e5f8eab8 3815 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3816 journal_inode, journal_inode->i_size);
1d1fe1ee 3817 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3818 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3819 iput(journal_inode);
3820 return NULL;
3821 }
3822
dab291af 3823 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3824 if (!journal) {
b31e1552 3825 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3826 iput(journal_inode);
3827 return NULL;
3828 }
3829 journal->j_private = sb;
617ba13b 3830 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3831 return journal;
3832}
3833
617ba13b 3834static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3835 dev_t j_dev)
3836{
2b2d6d01 3837 struct buffer_head *bh;
ac27a0ec 3838 journal_t *journal;
617ba13b
MC		 3839 ext4_fsblk_t start;
3840 ext4_fsblk_t len;
ac27a0ec 3841 int hblock, blocksize;
617ba13b 3842 ext4_fsblk_t sb_block;
ac27a0ec 3843 unsigned long offset;
2b2d6d01 3844 struct ext4_super_block *es;
ac27a0ec
DK		 3845 struct block_device *bdev;
3846
0390131b
FM		 3847 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3848
b31e1552 3849 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3850 if (bdev == NULL)
3851 return NULL;
3852
ac27a0ec 3853 blocksize = sb->s_blocksize;
e1defc4f 3854 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3855 if (blocksize < hblock) {
b31e1552
ES		 3856 ext4_msg(sb, KERN_ERR,
3857 "blocksize too small for journal device");
ac27a0ec
DK		 3858 goto out_bdev;
3859 }
3860
617ba13b
MC		 3861 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3862 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3863 set_blocksize(bdev, blocksize);
3864 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3865 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3866 "external journal");
ac27a0ec
DK		 3867 goto out_bdev;
3868 }
3869
617ba13b
MC		 3870 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3871 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3872 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3873 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3874 ext4_msg(sb, KERN_ERR, "external journal has "
3875 "bad superblock");
ac27a0ec
DK		 3876 brelse(bh);
3877 goto out_bdev;
3878 }
3879
617ba13b 3880 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3881 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3882 brelse(bh);
3883 goto out_bdev;
3884 }
3885
bd81d8ee 3886 len = ext4_blocks_count(es);
ac27a0ec
DK		 3887 start = sb_block + 1;
3888 brelse(bh); /* we're done with the superblock */
3889
dab291af 3890 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3891 start, len, blocksize);
3892 if (!journal) {
b31e1552 3893 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3894 goto out_bdev;
3895 }
3896 journal->j_private = sb;
3897 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3898 wait_on_buffer(journal->j_sb_buffer);
3899 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3900 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3901 goto out_journal;
3902 }
3903 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3904 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3905 "user (unsupported) - %d",
ac27a0ec
DK		 3906 be32_to_cpu(journal->j_superblock->s_nr_users));
3907 goto out_journal;
3908 }
617ba13b
MC		 3909 EXT4_SB(sb)->journal_bdev = bdev;
3910 ext4_init_journal_params(sb, journal);
ac27a0ec 3911 return journal;
0b8e58a1 3912
ac27a0ec 3913out_journal:
dab291af 3914 jbd2_journal_destroy(journal);
ac27a0ec 3915out_bdev:
617ba13b 3916 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3917 return NULL;
3918}
3919
617ba13b
MC		 3920static int ext4_load_journal(struct super_block *sb,
3921 struct ext4_super_block *es,
ac27a0ec
DK		 3922 unsigned long journal_devnum)
3923{
3924 journal_t *journal;
3925 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3926 dev_t journal_dev;
3927 int err = 0;
3928 int really_read_only;
3929
0390131b
FM		 3930 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3931
ac27a0ec
DK		 3932 if (journal_devnum &&
3933 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3934 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3935 "numbers have changed");
ac27a0ec
DK		 3936 journal_dev = new_decode_dev(journal_devnum);
3937 } else
3938 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3939
3940 really_read_only = bdev_read_only(sb->s_bdev);
3941
3942 /*
3943 * Are we loading a blank journal or performing recovery after a
3944 * crash? For recovery, we need to check in advance whether we
3945 * can get read-write access to the device.
3946 */
617ba13b 3947 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3948 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3949 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3950 "required on readonly filesystem");
ac27a0ec 3951 if (really_read_only) {
b31e1552
ES		 3952 ext4_msg(sb, KERN_ERR, "write access "
3953 "unavailable, cannot proceed");
ac27a0ec
DK		 3954 return -EROFS;
3955 }
b31e1552
ES		 3956 ext4_msg(sb, KERN_INFO, "write access will "
3957 "be enabled during recovery");
ac27a0ec
DK		 3958 }
3959 }
3960
3961 if (journal_inum && journal_dev) {
b31e1552
ES		 3962 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3963 "and inode journals!");
ac27a0ec
DK		 3964 return -EINVAL;
3965 }
3966
3967 if (journal_inum) {
617ba13b 3968 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3969 return -EINVAL;
3970 } else {
617ba13b 3971 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3972 return -EINVAL;
3973 }
3974
90576c0b 3975 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3976 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3977
617ba13b 3978 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3979 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 3980 if (!err) {
3981 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3982 if (save)
3983 memcpy(save, ((char *) es) +
3984 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 3985 err = jbd2_journal_load(journal);
1c13d5c0
TT		 3986 if (save)
3987 memcpy(((char *) es) + EXT4_S_ERR_START,
3988 save, EXT4_S_ERR_LEN);
3989 kfree(save);
3990 }
ac27a0ec
DK		 3991
3992 if (err) {
b31e1552 3993 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3994 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3995 return err;
3996 }
3997
617ba13b
MC		 3998 EXT4_SB(sb)->s_journal = journal;
3999 ext4_clear_journal_err(sb, es);
ac27a0ec 4000
c41303ce 4001 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4002 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4003 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4004
4005 /* Make sure we flush the recovery flag to disk. */
e2d67052 4006 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4007 }
4008
4009 return 0;
4010}
4011
e2d67052 4012static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4013{
e2d67052 4014 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4015 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4016 int error = 0;
ac27a0ec 4017
7c2e7087 4018 if (!sbh || block_device_ejected(sb))
c4be0c1d 4019 return error;
914258bf
TT		 4020 if (buffer_write_io_error(sbh)) {
4021 /*
4022 * Oh, dear. A previous attempt to write the
4023 * superblock failed. This could happen because the
4024 * USB device was yanked out. Or it could happen to
4025 * be a transient write error and maybe the block will
4026 * be remapped. Nothing we can do but to retry the
4027 * write and hope for the best.
4028 */
b31e1552
ES		 4029 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4030 "superblock detected");
914258bf
TT		 4031 clear_buffer_write_io_error(sbh);
4032 set_buffer_uptodate(sbh);
4033 }
71290b36
TT		 4034 /*
4035 * If the file system is mounted read-only, don't update the
4036 * superblock write time. This avoids updating the superblock
4037 * write time when we are mounting the root file system
4038 * read/only but we need to replay the journal; at that point,
4039 * for people who are east of GMT and who make their clock
4040 * tick in localtime for Windows bug-for-bug compatibility,
4041 * the clock is set in the future, and this will cause e2fsck
4042 * to complain and force a full file system check.
4043 */
4044 if (!(sb->s_flags & MS_RDONLY))
4045 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4046 if (sb->s_bdev->bd_part)
4047 es->s_kbytes_written =
4048 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4049 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4050 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4051 else
4052 es->s_kbytes_written =
4053 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4054 ext4_free_blocks_count_set(es,
4055 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4056 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4057 es->s_free_inodes_count =
4058 cpu_to_le32(percpu_counter_sum_positive(
4059 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4060 sb->s_dirt = 0;
ac27a0ec
DK		 4061 BUFFER_TRACE(sbh, "marking dirty");
4062 mark_buffer_dirty(sbh);
914258bf 4063 if (sync) {
c4be0c1d
TS		 4064 error = sync_dirty_buffer(sbh);
4065 if (error)
4066 return error;
4067
4068 error = buffer_write_io_error(sbh);
4069 if (error) {
b31e1552
ES		 4070 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4071 "superblock");
914258bf
TT		 4072 clear_buffer_write_io_error(sbh);
4073 set_buffer_uptodate(sbh);
4074 }
4075 }
c4be0c1d 4076 return error;
ac27a0ec
DK		 4077}
4078
ac27a0ec
DK		 4079/*
4080 * Have we just finished recovery? If so, and if we are mounting (or
4081 * remounting) the filesystem readonly, then we will end up with a
4082 * consistent fs on disk. Record that fact.
4083 */
2b2d6d01
TT		 4084static void ext4_mark_recovery_complete(struct super_block *sb,
4085 struct ext4_super_block *es)
ac27a0ec 4086{
617ba13b 4087 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4088
0390131b
FM		 4089 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4090 BUG_ON(journal != NULL);
4091 return;
4092 }
dab291af 4093 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4094 if (jbd2_journal_flush(journal) < 0)
4095 goto out;
4096
617ba13b 4097 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4098 sb->s_flags & MS_RDONLY) {
617ba13b 4099 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4100 ext4_commit_super(sb, 1);
ac27a0ec 4101 }
7ffe1ea8
HK		 4102
4103out:
dab291af 4104 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4105}
4106
4107/*
4108 * If we are mounting (or read-write remounting) a filesystem whose journal
4109 * has recorded an error from a previous lifetime, move that error to the
4110 * main filesystem now.
4111 */
2b2d6d01
TT		 4112static void ext4_clear_journal_err(struct super_block *sb,
4113 struct ext4_super_block *es)
ac27a0ec
DK		 4114{
4115 journal_t *journal;
4116 int j_errno;
4117 const char *errstr;
4118
0390131b
FM		 4119 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4120
617ba13b 4121 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4122
4123 /*
4124 * Now check for any error status which may have been recorded in the
617ba13b 4125 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4126 */
4127
dab291af 4128 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4129 if (j_errno) {
4130 char nbuf[16];
4131
617ba13b 4132 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4133 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4134 "from previous mount: %s", errstr);
12062ddd 4135 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4136
617ba13b
MC		 4137 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4138 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4139 ext4_commit_super(sb, 1);
ac27a0ec 4140
dab291af 4141 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4142 }
4143}
4144
4145/*
4146 * Force the running and committing transactions to commit,
4147 * and wait on the commit.
4148 */
617ba13b 4149int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4150{
4151 journal_t *journal;
0390131b 4152 int ret = 0;
ac27a0ec
DK		 4153
4154 if (sb->s_flags & MS_RDONLY)
4155 return 0;
4156
617ba13b 4157 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4158 if (journal) {
437f88cc 4159 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4160 ret = ext4_journal_force_commit(journal);
6b0310fb 4161 }
0390131b 4162
ac27a0ec
DK		 4163 return ret;
4164}
4165
2b2d6d01 4166static void ext4_write_super(struct super_block *sb)
ac27a0ec 4167{
ebc1ac16 4168 lock_super(sb);
9ca92389 4169 ext4_commit_super(sb, 1);
ebc1ac16 4170 unlock_super(sb);
ac27a0ec
DK		 4171}
4172
617ba13b 4173static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4174{
14ce0cb4 4175 int ret = 0;
9eddacf9 4176 tid_t target;
8d5d02e6 4177 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4178
9bffad1e 4179 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4180 flush_workqueue(sbi->dio_unwritten_wq);
4181 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4182 if (wait)
8d5d02e6 4183 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4184 }
14ce0cb4 4185 return ret;
ac27a0ec
DK		 4186}
4187
4188/*
4189 * LVM calls this function before a (read-only) snapshot is created. This
4190 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4191 *
4192 * Note that only this function cannot bring a filesystem to be in a clean
4193 * state independently, because ext4 prevents a new handle from being started
4194 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4195 * the upper layer.
ac27a0ec 4196 */
c4be0c1d 4197static int ext4_freeze(struct super_block *sb)
ac27a0ec 4198{
c4be0c1d
TS		 4199 int error = 0;
4200 journal_t *journal;
ac27a0ec 4201
9ca92389
TT		 4202 if (sb->s_flags & MS_RDONLY)
4203 return 0;
ac27a0ec 4204
9ca92389 4205 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4206
9ca92389
TT		 4207 /* Now we set up the journal barrier. */
4208 jbd2_journal_lock_updates(journal);
ac27a0ec 4209
9ca92389
TT		 4210 /*
4211 * Don't clear the needs_recovery flag if we failed to flush
4212 * the journal.
4213 */
4214 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4215 if (error < 0)
4216 goto out;
9ca92389
TT		 4217
4218 /* Journal blocked and flushed, clear needs_recovery flag. */
4219 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4220 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4221out:
4222 /* we rely on s_frozen to stop further updates */
4223 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4224 return error;
ac27a0ec
DK		 4225}
4226
4227/*
4228 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4229 * flag here, even though the filesystem is not technically dirty yet.
4230 */
c4be0c1d 4231static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4232{
9ca92389
TT		 4233 if (sb->s_flags & MS_RDONLY)
4234 return 0;
4235
4236 lock_super(sb);
4237 /* Reset the needs_recovery flag before the fs is unlocked. */
4238 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4239 ext4_commit_super(sb, 1);
4240 unlock_super(sb);
c4be0c1d 4241 return 0;
ac27a0ec
DK		 4242}
4243
673c6100
TT		 4244/*
4245 * Structure to save mount options for ext4_remount's benefit
4246 */
4247struct ext4_mount_options {
4248 unsigned long s_mount_opt;
a2595b8a 4249 unsigned long s_mount_opt2;
673c6100
TT		 4250 uid_t s_resuid;
4251 gid_t s_resgid;
4252 unsigned long s_commit_interval;
4253 u32 s_min_batch_time, s_max_batch_time;
4254#ifdef CONFIG_QUOTA
4255 int s_jquota_fmt;
4256 char *s_qf_names[MAXQUOTAS];
4257#endif
4258};
4259
2b2d6d01 4260static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4261{
2b2d6d01 4262 struct ext4_super_block *es;
617ba13b 4263 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4264 unsigned long old_sb_flags;
617ba13b 4265 struct ext4_mount_options old_opts;
c79d967d 4266 int enable_quota = 0;
8a266467 4267 ext4_group_t g;
b3881f74 4268 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4269 int err = 0;
ac27a0ec
DK		 4270#ifdef CONFIG_QUOTA
4271 int i;
4272#endif
d4c402d9 4273 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4274
4275 /* Store the original options */
bbd6851a 4276 lock_super(sb);
ac27a0ec
DK		 4277 old_sb_flags = sb->s_flags;
4278 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4279 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4280 old_opts.s_resuid = sbi->s_resuid;
4281 old_opts.s_resgid = sbi->s_resgid;
4282 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4283 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4284 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4285#ifdef CONFIG_QUOTA
4286 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4287 for (i = 0; i < MAXQUOTAS; i++)
4288 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4289#endif
b3881f74
TT		 4290 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4291 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4292
4293 /*
4294 * Allow the "check" option to be passed as a remount option.
4295 */
661aa520 4296 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4297 err = -EINVAL;
4298 goto restore_opts;
4299 }
4300
4ab2f15b 4301 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4302 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4303
4304 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4305 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4306
4307 es = sbi->s_es;
4308
b3881f74 4309 if (sbi->s_journal) {
0390131b 4310 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4311 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4312 }
ac27a0ec 4313
661aa520 4314 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4315 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4316 err = -EROFS;
4317 goto restore_opts;
4318 }
4319
4320 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4321 err = dquot_suspend(sb, -1);
4322 if (err < 0)
c79d967d 4323 goto restore_opts;
c79d967d 4324
ac27a0ec
DK		 4325 /*
4326 * First of all, the unconditional stuff we have to do
4327 * to disable replay of the journal when we next remount
4328 */
4329 sb->s_flags |= MS_RDONLY;
4330
4331 /*
4332 * OK, test if we are remounting a valid rw partition
4333 * readonly, and if so set the rdonly flag and then
4334 * mark the partition as valid again.
4335 */
617ba13b
MC		 4336 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4337 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4338 es->s_state = cpu_to_le16(sbi->s_mount_state);
4339
a63c9eb2 4340 if (sbi->s_journal)
0390131b 4341 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4342 } else {
a13fb1a4
ES		 4343 /* Make sure we can mount this feature set readwrite */
4344 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4345 err = -EROFS;
4346 goto restore_opts;
4347 }
8a266467
TT		 4348 /*
4349 * Make sure the group descriptor checksums
0b8e58a1 4350 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4351 */
4352 for (g = 0; g < sbi->s_groups_count; g++) {
4353 struct ext4_group_desc *gdp =
4354 ext4_get_group_desc(sb, g, NULL);
4355
4356 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4357 ext4_msg(sb, KERN_ERR,
4358 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4359 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4360 le16_to_cpu(gdp->bg_checksum));
4361 err = -EINVAL;
4362 goto restore_opts;
4363 }
4364 }
4365
ead6596b
ES		 4366 /*
4367 * If we have an unprocessed orphan list hanging
4368 * around from a previously readonly bdev mount,
4369 * require a full umount/remount for now.
4370 */
4371 if (es->s_last_orphan) {
b31e1552 4372 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4373 "remount RDWR because of unprocessed "
4374 "orphan inode list. Please "
b31e1552 4375 "umount/remount instead");
ead6596b
ES		 4376 err = -EINVAL;
4377 goto restore_opts;
4378 }
4379
ac27a0ec
DK		 4380 /*
4381 * Mounting a RDONLY partition read-write, so reread
4382 * and store the current valid flag. (It may have
4383 * been changed by e2fsck since we originally mounted
4384 * the partition.)
4385 */
0390131b
FM		 4386 if (sbi->s_journal)
4387 ext4_clear_journal_err(sb, es);
ac27a0ec 4388 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4389 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4390 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4391 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4392 EXT4_FEATURE_INCOMPAT_MMP))
4393 if (ext4_multi_mount_protect(sb,
4394 le64_to_cpu(es->s_mmp_block))) {
4395 err = -EROFS;
4396 goto restore_opts;
4397 }
c79d967d 4398 enable_quota = 1;
ac27a0ec
DK		 4399 }
4400 }
bfff6873
LC		 4401
4402 /*
4403 * Reinitialize lazy itable initialization thread based on
4404 * current settings
4405 */
4406 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4407 ext4_unregister_li_request(sb);
4408 else {
4409 ext4_group_t first_not_zeroed;
4410 first_not_zeroed = ext4_has_uninit_itable(sb);
4411 ext4_register_li_request(sb, first_not_zeroed);
4412 }
4413
6fd058f7 4414 ext4_setup_system_zone(sb);
0390131b 4415 if (sbi->s_journal == NULL)
e2d67052 4416 ext4_commit_super(sb, 1);
0390131b 4417
ac27a0ec
DK		 4418#ifdef CONFIG_QUOTA
4419 /* Release old quota file names */
4420 for (i = 0; i < MAXQUOTAS; i++)
4421 if (old_opts.s_qf_names[i] &&
4422 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4423 kfree(old_opts.s_qf_names[i]);
4424#endif
bbd6851a 4425 unlock_super(sb);
c79d967d 4426 if (enable_quota)
0f0dd62f 4427 dquot_resume(sb, -1);
d4c402d9
CW		 4428
4429 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4430 kfree(orig_data);
ac27a0ec 4431 return 0;
0b8e58a1 4432
ac27a0ec
DK		 4433restore_opts:
4434 sb->s_flags = old_sb_flags;
4435 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4436 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4437 sbi->s_resuid = old_opts.s_resuid;
4438 sbi->s_resgid = old_opts.s_resgid;
4439 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4440 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4441 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4442#ifdef CONFIG_QUOTA
4443 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4444 for (i = 0; i < MAXQUOTAS; i++) {
4445 if (sbi->s_qf_names[i] &&
4446 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4447 kfree(sbi->s_qf_names[i]);
4448 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4449 }
4450#endif
bbd6851a 4451 unlock_super(sb);
d4c402d9 4452 kfree(orig_data);
ac27a0ec
DK		 4453 return err;
4454}
4455
f975d6bc
TT		 4456/*
4457 * Note: calculating the overhead so we can be compatible with
4458 * historical BSD practice is quite difficult in the face of
4459 * clusters/bigalloc. This is because multiple metadata blocks from
4460 * different block group can end up in the same allocation cluster.
4461 * Calculating the exact overhead in the face of clustered allocation
4462 * requires either O(all block bitmaps) in memory or O(number of block
4463 * groups**2) in time. We will still calculate the superblock for
4464 * older file systems --- and if we come across with a bigalloc file
4465 * system with zero in s_overhead_clusters the estimate will be close to
4466 * correct especially for very large cluster sizes --- but for newer
4467 * file systems, it's better to calculate this figure once at mkfs
4468 * time, and store it in the superblock. If the superblock value is
4469 * present (even for non-bigalloc file systems), we will use it.
4470 */
2b2d6d01 4471static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4472{
4473 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4474 struct ext4_sb_info *sbi = EXT4_SB(sb);
4475 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4476 struct ext4_group_desc *gdp;
960cc398 4477 u64 fsid;
d02a9391 4478 s64 bfree;
ac27a0ec 4479
5e70030d
BP		 4480 if (test_opt(sb, MINIX_DF)) {
4481 sbi->s_overhead_last = 0;
f975d6bc
TT		 4482 } else if (es->s_overhead_clusters) {
4483 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4484 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4485 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4486 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4487
4488 /*
5e70030d
BP		 4489 * Compute the overhead (FS structures). This is constant
4490 * for a given filesystem unless the number of block groups
4491 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4492 */
4493
4494 /*
4495 * All of the blocks before first_data_block are
4496 * overhead
4497 */
f975d6bc 4498 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4499
4500 /*
f975d6bc 4501 * Add the overhead found in each block group
ac27a0ec
DK		 4502 */
4503 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4504 gdp = ext4_get_group_desc(sb, i, NULL);
4505 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4506 cond_resched();
4507 }
5e70030d
BP		 4508 sbi->s_overhead_last = overhead;
4509 smp_wmb();
6bc9feff 4510 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4511 }
4512
617ba13b 4513 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4514 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4515 buf->f_blocks = (ext4_blocks_count(es) -
4516 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4517 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4518 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4519 /* prevent underflow in case that few free space is available */
57042651 4520 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4521 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4522 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4523 buf->f_bavail = 0;
4524 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4525 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4526 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4527 fsid = le64_to_cpup((void *)es->s_uuid) ^
4528 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4529 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4530 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4531
ac27a0ec
DK		 4532 return 0;
4533}
4534
0b8e58a1
AD		 4535/* Helper function for writing quotas on sync - we need to start transaction
4536 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4537 * Process 1 Process 2
617ba13b 4538 * ext4_create() quota_sync()
a269eb18 4539 * jbd2_journal_start() write_dquot()
871a2931 4540 * dquot_initialize() down(dqio_mutex)
dab291af 4541 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4542 *
4543 */
4544
4545#ifdef CONFIG_QUOTA
4546
4547static inline struct inode *dquot_to_inode(struct dquot *dquot)
4548{
4549 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4550}
4551
617ba13b 4552static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4553{
4554 int ret, err;
4555 handle_t *handle;
4556 struct inode *inode;
4557
4558 inode = dquot_to_inode(dquot);
617ba13b 4559 handle = ext4_journal_start(inode,
0b8e58a1 4560 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4561 if (IS_ERR(handle))
4562 return PTR_ERR(handle);
4563 ret = dquot_commit(dquot);
617ba13b 4564 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4565 if (!ret)
4566 ret = err;
4567 return ret;
4568}
4569
617ba13b 4570static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4571{
4572 int ret, err;
4573 handle_t *handle;
4574
617ba13b 4575 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4576 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4577 if (IS_ERR(handle))
4578 return PTR_ERR(handle);
4579 ret = dquot_acquire(dquot);
617ba13b 4580 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4581 if (!ret)
4582 ret = err;
4583 return ret;
4584}
4585
617ba13b 4586static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4587{
4588 int ret, err;
4589 handle_t *handle;
4590
617ba13b 4591 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4592 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4593 if (IS_ERR(handle)) {
4594 /* Release dquot anyway to avoid endless cycle in dqput() */
4595 dquot_release(dquot);
ac27a0ec 4596 return PTR_ERR(handle);
9c3013e9 4597 }
ac27a0ec 4598 ret = dquot_release(dquot);
617ba13b 4599 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4600 if (!ret)
4601 ret = err;
4602 return ret;
4603}
4604
617ba13b 4605static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4606{
2c8be6b2 4607 /* Are we journaling quotas? */
617ba13b
MC		 4608 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4609 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4610 dquot_mark_dquot_dirty(dquot);
617ba13b 4611 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4612 } else {
4613 return dquot_mark_dquot_dirty(dquot);
4614 }
4615}
4616
617ba13b 4617static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4618{
4619 int ret, err;
4620 handle_t *handle;
4621
4622 /* Data block + inode block */
617ba13b 4623 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4624 if (IS_ERR(handle))
4625 return PTR_ERR(handle);
4626 ret = dquot_commit_info(sb, type);
617ba13b 4627 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4628 if (!ret)
4629 ret = err;
4630 return ret;
4631}
4632
4633/*
4634 * Turn on quotas during mount time - we need to find
4635 * the quota file and such...
4636 */
617ba13b 4637static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4638{
287a8095
CH		 4639 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4640 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4641}
4642
4643/*
4644 * Standard function to be called on quota_on
4645 */
617ba13b 4646static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4647 struct path *path)
ac27a0ec
DK		 4648{
4649 int err;
ac27a0ec
DK		 4650
4651 if (!test_opt(sb, QUOTA))
4652 return -EINVAL;
0623543b 4653
ac27a0ec 4654 /* Quotafile not on the same filesystem? */
d8c9584e 4655 if (path->dentry->d_sb != sb)
ac27a0ec 4656 return -EXDEV;
0623543b
JK		 4657 /* Journaling quota? */
4658 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4659 /* Quotafile not in fs root? */
f00c9e44 4660 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4661 ext4_msg(sb, KERN_WARNING,
4662 "Quota file not on filesystem root. "
4663 "Journaled quota will not work");
2b2d6d01 4664 }
0623543b
JK		 4665
4666 /*
4667 * When we journal data on quota file, we have to flush journal to see
4668 * all updates to the file when we bypass pagecache...
4669 */
0390131b 4670 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4671 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4672 /*
4673 * We don't need to lock updates but journal_flush() could
4674 * otherwise be livelocked...
4675 */
4676 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4677 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4678 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4679 if (err)
7ffe1ea8 4680 return err;
0623543b
JK		 4681 }
4682
f00c9e44 4683 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4684}
4685
ca0e05e4
DM		 4686static int ext4_quota_off(struct super_block *sb, int type)
4687{
21f97697
JK		 4688 struct inode *inode = sb_dqopt(sb)->files[type];
4689 handle_t *handle;
4690
87009d86
DM		 4691 /* Force all delayed allocation blocks to be allocated.
4692 * Caller already holds s_umount sem */
4693 if (test_opt(sb, DELALLOC))
ca0e05e4 4694 sync_filesystem(sb);
ca0e05e4 4695
0b268590
AG		 4696 if (!inode)
4697 goto out;
4698
21f97697
JK		 4699 /* Update modification times of quota files when userspace can
4700 * start looking at them */
4701 handle = ext4_journal_start(inode, 1);
4702 if (IS_ERR(handle))
4703 goto out;
4704 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4705 ext4_mark_inode_dirty(handle, inode);
4706 ext4_journal_stop(handle);
4707
4708out:
ca0e05e4
DM		 4709 return dquot_quota_off(sb, type);
4710}
4711
ac27a0ec
DK		 4712/* Read data from quotafile - avoid pagecache and such because we cannot afford
4713 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4714 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4715 * we don't have to be afraid of races */
617ba13b 4716static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4717 size_t len, loff_t off)
4718{
4719 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4720 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4721 int err = 0;
4722 int offset = off & (sb->s_blocksize - 1);
4723 int tocopy;
4724 size_t toread;
4725 struct buffer_head *bh;
4726 loff_t i_size = i_size_read(inode);
4727
4728 if (off > i_size)
4729 return 0;
4730 if (off+len > i_size)
4731 len = i_size-off;
4732 toread = len;
4733 while (toread > 0) {
4734 tocopy = sb->s_blocksize - offset < toread ?
4735 sb->s_blocksize - offset : toread;
617ba13b 4736 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4737 if (err)
4738 return err;
4739 if (!bh) /* A hole? */
4740 memset(data, 0, tocopy);
4741 else
4742 memcpy(data, bh->b_data+offset, tocopy);
4743 brelse(bh);
4744 offset = 0;
4745 toread -= tocopy;
4746 data += tocopy;
4747 blk++;
4748 }
4749 return len;
4750}
4751
4752/* Write to quotafile (we know the transaction is already started and has
4753 * enough credits) */
617ba13b 4754static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4755 const char *data, size_t len, loff_t off)
4756{
4757 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4758 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4759 int err = 0;
4760 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4761 struct buffer_head *bh;
4762 handle_t *handle = journal_current_handle();
4763
0390131b 4764 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4765 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4766 " cancelled because transaction is not started",
9c3013e9
JK		 4767 (unsigned long long)off, (unsigned long long)len);
4768 return -EIO;
4769 }
67eeb568
DM		 4770 /*
4771 * Since we account only one data block in transaction credits,
4772 * then it is impossible to cross a block boundary.
4773 */
4774 if (sb->s_blocksize - offset < len) {
4775 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4776 " cancelled because not block aligned",
4777 (unsigned long long)off, (unsigned long long)len);
4778 return -EIO;
4779 }
4780
ac27a0ec 4781 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4782 bh = ext4_bread(handle, inode, blk, 1, &err);
4783 if (!bh)
4784 goto out;
62d2b5f2
JK		 4785 err = ext4_journal_get_write_access(handle, bh);
4786 if (err) {
4787 brelse(bh);
4788 goto out;
ac27a0ec 4789 }
67eeb568
DM		 4790 lock_buffer(bh);
4791 memcpy(bh->b_data+offset, data, len);
4792 flush_dcache_page(bh->b_page);
4793 unlock_buffer(bh);
62d2b5f2 4794 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4795 brelse(bh);
ac27a0ec 4796out:
67eeb568 4797 if (err) {
4d04e4fb 4798 mutex_unlock(&inode->i_mutex);
ac27a0ec 4799 return err;
4d04e4fb 4800 }
67eeb568
DM		 4801 if (inode->i_size < off + len) {
4802 i_size_write(inode, off + len);
617ba13b 4803 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4804 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4805 }
ac27a0ec 4806 mutex_unlock(&inode->i_mutex);
67eeb568 4807 return len;
ac27a0ec
DK		 4808}
4809
4810#endif
4811
152a0836
AV		 4812static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4813 const char *dev_name, void *data)
ac27a0ec 4814{
152a0836 4815 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4816}
4817
37f328eb 4818#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4819static inline void register_as_ext2(void)
4820{
4821 int err = register_filesystem(&ext2_fs_type);
4822 if (err)
4823 printk(KERN_WARNING
4824 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4825}
4826
4827static inline void unregister_as_ext2(void)
4828{
4829 unregister_filesystem(&ext2_fs_type);
4830}
2035e776
TT		 4831
4832static inline int ext2_feature_set_ok(struct super_block *sb)
4833{
4834 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4835 return 0;
4836 if (sb->s_flags & MS_RDONLY)
4837 return 1;
4838 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4839 return 0;
4840 return 1;
4841}
51b7e3c9 4842MODULE_ALIAS("ext2");
24b58424
TT		 4843#else
4844static inline void register_as_ext2(void) { }
4845static inline void unregister_as_ext2(void) { }
2035e776 4846static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4847#endif
4848
37f328eb 4849#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4850static inline void register_as_ext3(void)
4851{
4852 int err = register_filesystem(&ext3_fs_type);
4853 if (err)
4854 printk(KERN_WARNING
4855 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4856}
4857
4858static inline void unregister_as_ext3(void)
4859{
4860 unregister_filesystem(&ext3_fs_type);
4861}
2035e776
TT		 4862
4863static inline int ext3_feature_set_ok(struct super_block *sb)
4864{
4865 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4866 return 0;
4867 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4868 return 0;
4869 if (sb->s_flags & MS_RDONLY)
4870 return 1;
4871 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4872 return 0;
4873 return 1;
4874}
51b7e3c9 4875MODULE_ALIAS("ext3");
24b58424
TT		 4876#else
4877static inline void register_as_ext3(void) { }
4878static inline void unregister_as_ext3(void) { }
2035e776 4879static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4880#endif
4881
03010a33
TT		 4882static struct file_system_type ext4_fs_type = {
4883 .owner = THIS_MODULE,
4884 .name = "ext4",
152a0836 4885 .mount = ext4_mount,
03010a33
TT		 4886 .kill_sb = kill_block_super,
4887 .fs_flags = FS_REQUIRES_DEV,
4888};
4889
8f021222 4890static int __init ext4_init_feat_adverts(void)
857ac889
LC		 4891{
4892 struct ext4_features *ef;
4893 int ret = -ENOMEM;
4894
4895 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4896 if (!ef)
4897 goto out;
4898
4899 ef->f_kobj.kset = ext4_kset;
4900 init_completion(&ef->f_kobj_unregister);
4901 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4902 "features");
4903 if (ret) {
4904 kfree(ef);
4905 goto out;
4906 }
4907
4908 ext4_feat = ef;
4909 ret = 0;
4910out:
4911 return ret;
4912}
4913
8f021222
LC		 4914static void ext4_exit_feat_adverts(void)
4915{
4916 kobject_put(&ext4_feat->f_kobj);
4917 wait_for_completion(&ext4_feat->f_kobj_unregister);
4918 kfree(ext4_feat);
4919}
4920
e9e3bcec
ES		 4921/* Shared across all ext4 file systems */
4922wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4923struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4924
5dabfc78 4925static int __init ext4_init_fs(void)
ac27a0ec 4926{
e9e3bcec 4927 int i, err;
c9de560d 4928
07c0c5d8
AV		 4929 ext4_li_info = NULL;
4930 mutex_init(&ext4_li_mtx);
4931
12e9b892 4932 ext4_check_flag_values();
e9e3bcec
ES		 4933
4934 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4935 mutex_init(&ext4__aio_mutex[i]);
4936 init_waitqueue_head(&ext4__ioend_wq[i]);
4937 }
4938
5dabfc78 4939 err = ext4_init_pageio();
6fd058f7
TT		 4940 if (err)
4941 return err;
5dabfc78 4942 err = ext4_init_system_zone();
bd2d0210 4943 if (err)
d44651d0 4944 goto out6;
3197ebdb
TT		 4945 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4946 if (!ext4_kset)
dd68314c 4947 goto out5;
d44651d0 4948 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 4949
4950 err = ext4_init_feat_adverts();
dd68314c
TT		 4951 if (err)
4952 goto out4;
857ac889 4953
5dabfc78 4954 err = ext4_init_mballoc();
ac27a0ec 4955 if (err)
6fd058f7 4956 goto out3;
c9de560d 4957
5dabfc78 4958 err = ext4_init_xattr();
c9de560d
AT		 4959 if (err)
4960 goto out2;
ac27a0ec
DK		 4961 err = init_inodecache();
4962 if (err)
4963 goto out1;
24b58424 4964 register_as_ext3();
2035e776 4965 register_as_ext2();
03010a33 4966 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4967 if (err)
4968 goto out;
bfff6873 4969
ac27a0ec
DK		 4970 return 0;
4971out:
24b58424
TT		 4972 unregister_as_ext2();
4973 unregister_as_ext3();
ac27a0ec
DK		 4974 destroy_inodecache();
4975out1:
5dabfc78 4976 ext4_exit_xattr();
c9de560d 4977out2:
5dabfc78 4978 ext4_exit_mballoc();
6fd058f7 4979out3:
8f021222 4980 ext4_exit_feat_adverts();
dd68314c 4981out4:
d44651d0
FJ		 4982 if (ext4_proc_root)
4983 remove_proc_entry("fs/ext4", NULL);
6fd058f7 4984 kset_unregister(ext4_kset);
d44651d0 4985out5:
5dabfc78 4986 ext4_exit_system_zone();
d44651d0 4987out6:
5dabfc78 4988 ext4_exit_pageio();
ac27a0ec
DK		 4989 return err;
4990}
4991
5dabfc78 4992static void __exit ext4_exit_fs(void)
ac27a0ec 4993{
bfff6873 4994 ext4_destroy_lazyinit_thread();
24b58424
TT		 4995 unregister_as_ext2();
4996 unregister_as_ext3();
03010a33 4997 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4998 destroy_inodecache();
5dabfc78
TT		 4999 ext4_exit_xattr();
5000 ext4_exit_mballoc();
8f021222 5001 ext4_exit_feat_adverts();
9f6200bb 5002 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5003 kset_unregister(ext4_kset);
5dabfc78
TT		 5004 ext4_exit_system_zone();
5005 ext4_exit_pageio();
ac27a0ec
DK		 5006}
5007
5008MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5009MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5010MODULE_LICENSE("GPL");
5dabfc78
TT		 5011module_init(ext4_init_fs)
5012module_exit(ext4_exit_fs)
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