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ext4: add tracepoint in punching hole
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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"
4a092d73 48#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
109#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110#else
111#define IS_EXT3_SB(sb) (0)
112#endif
bd81d8ee 113
d25425f8
DW		 114static int ext4_verify_csum_type(struct super_block *sb,
115 struct ext4_super_block *es)
116{
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
119 return 1;
120
121 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
122}
123
a9c47317
DW		 124static __le32 ext4_superblock_csum(struct super_block *sb,
125 struct ext4_super_block *es)
126{
127 struct ext4_sb_info *sbi = EXT4_SB(sb);
128 int offset = offsetof(struct ext4_super_block, s_checksum);
129 __u32 csum;
130
131 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
132
133 return cpu_to_le32(csum);
134}
135
136int ext4_superblock_csum_verify(struct super_block *sb,
137 struct ext4_super_block *es)
138{
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
141 return 1;
142
143 return es->s_checksum == ext4_superblock_csum(sb, es);
144}
145
06db49e6 146void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 147{
06db49e6
TT		 148 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
149
a9c47317
DW		 150 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
151 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
152 return;
153
154 es->s_checksum = ext4_superblock_csum(sb, es);
155}
156
9933fc0a
TT		 157void *ext4_kvmalloc(size_t size, gfp_t flags)
158{
159 void *ret;
160
161 ret = kmalloc(size, flags);
162 if (!ret)
163 ret = __vmalloc(size, flags, PAGE_KERNEL);
164 return ret;
165}
166
167void *ext4_kvzalloc(size_t size, gfp_t flags)
168{
169 void *ret;
170
db9481c0 171 ret = kzalloc(size, flags);
9933fc0a
TT		 172 if (!ret)
173 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
174 return ret;
175}
176
177void ext4_kvfree(void *ptr)
178{
179 if (is_vmalloc_addr(ptr))
180 vfree(ptr);
181 else
182 kfree(ptr);
183
184}
185
8fadc143
AR		 186ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
187 struct ext4_group_desc *bg)
bd81d8ee 188{
3a14589c 189 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 191 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 192}
193
8fadc143
AR		 194ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
195 struct ext4_group_desc *bg)
bd81d8ee 196{
5272f837 197 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 200}
201
8fadc143
AR		 202ext4_fsblk_t ext4_inode_table(struct super_block *sb,
203 struct ext4_group_desc *bg)
bd81d8ee 204{
5272f837 205 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 207 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 208}
209
021b65bb
TT		 210__u32 ext4_free_group_clusters(struct super_block *sb,
211 struct ext4_group_desc *bg)
560671a0
AK		 212{
213 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 215 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 216}
217
218__u32 ext4_free_inodes_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
220{
221 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 223 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 224}
225
226__u32 ext4_used_dirs_count(struct super_block *sb,
227 struct ext4_group_desc *bg)
228{
229 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 231 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 232}
233
234__u32 ext4_itable_unused_count(struct super_block *sb,
235 struct ext4_group_desc *bg)
236{
237 return le16_to_cpu(bg->bg_itable_unused_lo) |
238 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 239 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 240}
241
8fadc143
AR		 242void ext4_block_bitmap_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 244{
3a14589c 245 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 248}
249
8fadc143
AR		 250void ext4_inode_bitmap_set(struct super_block *sb,
251 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 252{
5272f837 253 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 256}
257
8fadc143
AR		 258void ext4_inode_table_set(struct super_block *sb,
259 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 260{
5272f837 261 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 264}
265
021b65bb
TT		 266void ext4_free_group_clusters_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 268{
269 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
272}
273
274void ext4_free_inodes_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
276{
277 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
280}
281
282void ext4_used_dirs_set(struct super_block *sb,
283 struct ext4_group_desc *bg, __u32 count)
284{
285 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
288}
289
290void ext4_itable_unused_set(struct super_block *sb,
291 struct ext4_group_desc *bg, __u32 count)
292{
293 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
294 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
295 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
296}
297
d3d1faf6
CW		 298
299/* Just increment the non-pointer handle value */
300static handle_t *ext4_get_nojournal(void)
301{
302 handle_t *handle = current->journal_info;
303 unsigned long ref_cnt = (unsigned long)handle;
304
305 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
306
307 ref_cnt++;
308 handle = (handle_t *)ref_cnt;
309
310 current->journal_info = handle;
311 return handle;
312}
313
314
315/* Decrement the non-pointer handle value */
316static void ext4_put_nojournal(handle_t *handle)
317{
318 unsigned long ref_cnt = (unsigned long)handle;
319
320 BUG_ON(ref_cnt == 0);
321
322 ref_cnt--;
323 handle = (handle_t *)ref_cnt;
324
325 current->journal_info = handle;
326}
327
ac27a0ec 328/*
dab291af 329 * Wrappers for jbd2_journal_start/end.
ac27a0ec 330 */
617ba13b 331handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 332{
333 journal_t *journal;
334
12706394 335 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 336 if (sb->s_flags & MS_RDONLY)
337 return ERR_PTR(-EROFS);
338
8e8ad8a5 339 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
617ba13b 340 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 341 if (!journal)
342 return ext4_get_nojournal();
343 /*
344 * Special case here: if the journal has aborted behind our
345 * backs (eg. EIO in the commit thread), then we still need to
346 * take the FS itself readonly cleanly.
347 */
348 if (is_journal_aborted(journal)) {
349 ext4_abort(sb, "Detected aborted journal");
350 return ERR_PTR(-EROFS);
ac27a0ec 351 }
be4f27d3 352 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 353}
354
c398eda0 355int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 356{
357 struct super_block *sb;
358 int err;
359 int rc;
360
0390131b 361 if (!ext4_handle_valid(handle)) {
d3d1faf6 362 ext4_put_nojournal(handle);
0390131b
FM		 363 return 0;
364 }
ac27a0ec
DK		 365 sb = handle->h_transaction->t_journal->j_private;
366 err = handle->h_err;
dab291af 367 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 368
369 if (!err)
370 err = rc;
371 if (err)
c398eda0 372 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 373 return err;
374}
375
90c7201b
TT		 376void ext4_journal_abort_handle(const char *caller, unsigned int line,
377 const char *err_fn, struct buffer_head *bh,
378 handle_t *handle, int err)
ac27a0ec
DK		 379{
380 char nbuf[16];
617ba13b 381 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 382
0390131b
FM		 383 BUG_ON(!ext4_handle_valid(handle));
384
ac27a0ec
DK		 385 if (bh)
386 BUFFER_TRACE(bh, "abort");
387
388 if (!handle->h_err)
389 handle->h_err = err;
390
391 if (is_handle_aborted(handle))
392 return;
393
92b97816 394 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 395 caller, line, errstr, err_fn);
ac27a0ec 396
dab291af 397 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 398}
399
1c13d5c0
TT		 400static void __save_error_info(struct super_block *sb, const char *func,
401 unsigned int line)
402{
403 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
404
405 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
406 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
407 es->s_last_error_time = cpu_to_le32(get_seconds());
408 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
409 es->s_last_error_line = cpu_to_le32(line);
410 if (!es->s_first_error_time) {
411 es->s_first_error_time = es->s_last_error_time;
412 strncpy(es->s_first_error_func, func,
413 sizeof(es->s_first_error_func));
414 es->s_first_error_line = cpu_to_le32(line);
415 es->s_first_error_ino = es->s_last_error_ino;
416 es->s_first_error_block = es->s_last_error_block;
417 }
66e61a9e
TT		 418 /*
419 * Start the daily error reporting function if it hasn't been
420 * started already
421 */
422 if (!es->s_error_count)
423 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 424 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 425}
426
427static void save_error_info(struct super_block *sb, const char *func,
428 unsigned int line)
429{
430 __save_error_info(sb, func, line);
431 ext4_commit_super(sb, 1);
432}
433
7c2e7087
TT		 434/*
435 * The del_gendisk() function uninitializes the disk-specific data
436 * structures, including the bdi structure, without telling anyone
437 * else. Once this happens, any attempt to call mark_buffer_dirty()
438 * (for example, by ext4_commit_super), will cause a kernel OOPS.
439 * This is a kludge to prevent these oops until we can put in a proper
440 * hook in del_gendisk() to inform the VFS and file system layers.
441 */
442static int block_device_ejected(struct super_block *sb)
443{
444 struct inode *bd_inode = sb->s_bdev->bd_inode;
445 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
446
447 return bdi->dev == NULL;
448}
449
18aadd47
BJ		 450static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
451{
452 struct super_block *sb = journal->j_private;
453 struct ext4_sb_info *sbi = EXT4_SB(sb);
454 int error = is_journal_aborted(journal);
455 struct ext4_journal_cb_entry *jce, *tmp;
456
457 spin_lock(&sbi->s_md_lock);
458 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
459 list_del_init(&jce->jce_list);
460 spin_unlock(&sbi->s_md_lock);
461 jce->jce_func(sb, jce, error);
462 spin_lock(&sbi->s_md_lock);
463 }
464 spin_unlock(&sbi->s_md_lock);
465}
1c13d5c0 466
ac27a0ec
DK		 467/* Deal with the reporting of failure conditions on a filesystem such as
468 * inconsistencies detected or read IO failures.
469 *
470 * On ext2, we can store the error state of the filesystem in the
617ba13b 471 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 472 * write ordering constraints on the superblock which prevent us from
473 * writing it out straight away; and given that the journal is about to
474 * be aborted, we can't rely on the current, or future, transactions to
475 * write out the superblock safely.
476 *
dab291af 477 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 478 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 479 * that error until we've noted it down and cleared it.
480 */
481
617ba13b 482static void ext4_handle_error(struct super_block *sb)
ac27a0ec 483{
ac27a0ec
DK		 484 if (sb->s_flags & MS_RDONLY)
485 return;
486
2b2d6d01 487 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 488 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 489
4ab2f15b 490 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 491 if (journal)
dab291af 492 jbd2_journal_abort(journal, -EIO);
ac27a0ec 493 }
2b2d6d01 494 if (test_opt(sb, ERRORS_RO)) {
b31e1552 495 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 496 sb->s_flags |= MS_RDONLY;
497 }
ac27a0ec 498 if (test_opt(sb, ERRORS_PANIC))
617ba13b 499 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 500 sb->s_id);
501}
502
12062ddd 503void __ext4_error(struct super_block *sb, const char *function,
c398eda0 504 unsigned int line, const char *fmt, ...)
ac27a0ec 505{
0ff2ea7d 506 struct va_format vaf;
ac27a0ec
DK		 507 va_list args;
508
509 va_start(args, fmt);
0ff2ea7d
JP		 510 vaf.fmt = fmt;
511 vaf.va = &args;
512 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
513 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 514 va_end(args);
f3fc0210 515 save_error_info(sb, function, line);
ac27a0ec 516
617ba13b 517 ext4_handle_error(sb);
ac27a0ec
DK		 518}
519
c398eda0
TT		 520void ext4_error_inode(struct inode *inode, const char *function,
521 unsigned int line, ext4_fsblk_t block,
273df556
FM		 522 const char *fmt, ...)
523{
524 va_list args;
f7c21177 525 struct va_format vaf;
1c13d5c0 526 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 527
1c13d5c0
TT		 528 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
529 es->s_last_error_block = cpu_to_le64(block);
530 save_error_info(inode->i_sb, function, line);
273df556 531 va_start(args, fmt);
f7c21177
TT		 532 vaf.fmt = fmt;
533 vaf.va = &args;
c398eda0 534 if (block)
d9ee81da
JP		 535 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
536 "inode #%lu: block %llu: comm %s: %pV\n",
537 inode->i_sb->s_id, function, line, inode->i_ino,
538 block, current->comm, &vaf);
539 else
540 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
541 "inode #%lu: comm %s: %pV\n",
542 inode->i_sb->s_id, function, line, inode->i_ino,
543 current->comm, &vaf);
273df556
FM		 544 va_end(args);
545
546 ext4_handle_error(inode->i_sb);
547}
548
c398eda0 549void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 550 unsigned int line, ext4_fsblk_t block,
551 const char *fmt, ...)
273df556
FM		 552{
553 va_list args;
f7c21177 554 struct va_format vaf;
1c13d5c0 555 struct ext4_super_block *es;
273df556
FM		 556 struct inode *inode = file->f_dentry->d_inode;
557 char pathname[80], *path;
558
1c13d5c0
TT		 559 es = EXT4_SB(inode->i_sb)->s_es;
560 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
561 save_error_info(inode->i_sb, function, line);
273df556 562 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 563 if (IS_ERR(path))
273df556 564 path = "(unknown)";
f7c21177
TT		 565 va_start(args, fmt);
566 vaf.fmt = fmt;
567 vaf.va = &args;
d9ee81da
JP		 568 if (block)
569 printk(KERN_CRIT
570 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
571 "block %llu: comm %s: path %s: %pV\n",
572 inode->i_sb->s_id, function, line, inode->i_ino,
573 block, current->comm, path, &vaf);
574 else
575 printk(KERN_CRIT
576 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
577 "comm %s: path %s: %pV\n",
578 inode->i_sb->s_id, function, line, inode->i_ino,
579 current->comm, path, &vaf);
273df556
FM		 580 va_end(args);
581
582 ext4_handle_error(inode->i_sb);
583}
584
2b2d6d01 585static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 586 char nbuf[16])
587{
588 char *errstr = NULL;
589
590 switch (errno) {
591 case -EIO:
592 errstr = "IO failure";
593 break;
594 case -ENOMEM:
595 errstr = "Out of memory";
596 break;
597 case -EROFS:
78f1ddbb
TT		 598 if (!sb || (EXT4_SB(sb)->s_journal &&
599 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 600 errstr = "Journal has aborted";
601 else
602 errstr = "Readonly filesystem";
603 break;
604 default:
605 /* If the caller passed in an extra buffer for unknown
606 * errors, textualise them now. Else we just return
607 * NULL. */
608 if (nbuf) {
609 /* Check for truncated error codes... */
610 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
611 errstr = nbuf;
612 }
613 break;
614 }
615
616 return errstr;
617}
618
617ba13b 619/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 620 * automatically and invokes the appropriate error response. */
621
c398eda0
TT		 622void __ext4_std_error(struct super_block *sb, const char *function,
623 unsigned int line, int errno)
ac27a0ec
DK		 624{
625 char nbuf[16];
626 const char *errstr;
627
628 /* Special case: if the error is EROFS, and we're not already
629 * inside a transaction, then there's really no point in logging
630 * an error. */
631 if (errno == -EROFS && journal_current_handle() == NULL &&
632 (sb->s_flags & MS_RDONLY))
633 return;
634
617ba13b 635 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 636 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
637 sb->s_id, function, line, errstr);
1c13d5c0 638 save_error_info(sb, function, line);
ac27a0ec 639
617ba13b 640 ext4_handle_error(sb);
ac27a0ec
DK		 641}
642
643/*
617ba13b 644 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 645 * abort function may be used to deal with unrecoverable failures such
646 * as journal IO errors or ENOMEM at a critical moment in log management.
647 *
648 * We unconditionally force the filesystem into an ABORT|READONLY state,
649 * unless the error response on the fs has been set to panic in which
650 * case we take the easy way out and panic immediately.
651 */
652
c67d859e 653void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 654 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 655{
656 va_list args;
657
1c13d5c0 658 save_error_info(sb, function, line);
ac27a0ec 659 va_start(args, fmt);
c398eda0
TT		 660 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
661 function, line);
ac27a0ec
DK		 662 vprintk(fmt, args);
663 printk("\n");
664 va_end(args);
665
1c13d5c0
TT		 666 if ((sb->s_flags & MS_RDONLY) == 0) {
667 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
668 sb->s_flags |= MS_RDONLY;
669 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
670 if (EXT4_SB(sb)->s_journal)
671 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
672 save_error_info(sb, function, line);
673 }
ac27a0ec 674 if (test_opt(sb, ERRORS_PANIC))
617ba13b 675 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 676}
677
0ff2ea7d 678void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 679{
0ff2ea7d 680 struct va_format vaf;
b31e1552
ES		 681 va_list args;
682
683 va_start(args, fmt);
0ff2ea7d
JP		 684 vaf.fmt = fmt;
685 vaf.va = &args;
686 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 687 va_end(args);
688}
689
12062ddd 690void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 691 unsigned int line, const char *fmt, ...)
ac27a0ec 692{
0ff2ea7d 693 struct va_format vaf;
ac27a0ec
DK		 694 va_list args;
695
696 va_start(args, fmt);
0ff2ea7d
JP		 697 vaf.fmt = fmt;
698 vaf.va = &args;
699 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
700 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 701 va_end(args);
702}
703
e29136f8
TT		 704void __ext4_grp_locked_error(const char *function, unsigned int line,
705 struct super_block *sb, ext4_group_t grp,
706 unsigned long ino, ext4_fsblk_t block,
707 const char *fmt, ...)
5d1b1b3f
AK		 708__releases(bitlock)
709__acquires(bitlock)
710{
0ff2ea7d 711 struct va_format vaf;
5d1b1b3f
AK		 712 va_list args;
713 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
714
1c13d5c0
TT		 715 es->s_last_error_ino = cpu_to_le32(ino);
716 es->s_last_error_block = cpu_to_le64(block);
717 __save_error_info(sb, function, line);
0ff2ea7d 718
5d1b1b3f 719 va_start(args, fmt);
0ff2ea7d
JP		 720
721 vaf.fmt = fmt;
722 vaf.va = &args;
21149d61 723 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 724 sb->s_id, function, line, grp);
725 if (ino)
0ff2ea7d 726 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 727 if (block)
0ff2ea7d
JP		 728 printk(KERN_CONT "block %llu:", (unsigned long long) block);
729 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 730 va_end(args);
731
732 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 733 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 734 return;
735 }
1c13d5c0 736
5d1b1b3f
AK		 737 ext4_unlock_group(sb, grp);
738 ext4_handle_error(sb);
739 /*
740 * We only get here in the ERRORS_RO case; relocking the group
741 * may be dangerous, but nothing bad will happen since the
742 * filesystem will have already been marked read/only and the
743 * journal has been aborted. We return 1 as a hint to callers
744 * who might what to use the return value from
25985edc 745 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 746 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
747 * aggressively from the ext4 function in question, with a
748 * more appropriate error code.
749 */
750 ext4_lock_group(sb, grp);
751 return;
752}
753
617ba13b 754void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 755{
617ba13b 756 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 757
617ba13b 758 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 759 return;
760
12062ddd 761 ext4_warning(sb,
ac27a0ec
DK		 762 "updating to rev %d because of new feature flag, "
763 "running e2fsck is recommended",
617ba13b 764 EXT4_DYNAMIC_REV);
ac27a0ec 765
617ba13b
MC		 766 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
767 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
768 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 769 /* leave es->s_feature_*compat flags alone */
770 /* es->s_uuid will be set by e2fsck if empty */
771
772 /*
773 * The rest of the superblock fields should be zero, and if not it
774 * means they are likely already in use, so leave them alone. We
775 * can leave it up to e2fsck to clean up any inconsistencies there.
776 */
777}
778
779/*
780 * Open the external journal device
781 */
b31e1552 782static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 783{
784 struct block_device *bdev;
785 char b[BDEVNAME_SIZE];
786
d4d77629 787 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 788 if (IS_ERR(bdev))
789 goto fail;
790 return bdev;
791
792fail:
b31e1552 793 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 794 __bdevname(dev, b), PTR_ERR(bdev));
795 return NULL;
796}
797
798/*
799 * Release the journal device
800 */
617ba13b 801static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 802{
e525fd89 803 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 804}
805
617ba13b 806static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 807{
808 struct block_device *bdev;
809 int ret = -ENODEV;
810
811 bdev = sbi->journal_bdev;
812 if (bdev) {
617ba13b 813 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 814 sbi->journal_bdev = NULL;
815 }
816 return ret;
817}
818
819static inline struct inode *orphan_list_entry(struct list_head *l)
820{
617ba13b 821 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 822}
823
617ba13b 824static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 825{
826 struct list_head *l;
827
b31e1552
ES		 828 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
829 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 830
831 printk(KERN_ERR "sb_info orphan list:\n");
832 list_for_each(l, &sbi->s_orphan) {
833 struct inode *inode = orphan_list_entry(l);
834 printk(KERN_ERR " "
835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
836 inode->i_sb->s_id, inode->i_ino, inode,
837 inode->i_mode, inode->i_nlink,
838 NEXT_ORPHAN(inode));
839 }
840}
841
2b2d6d01 842static void ext4_put_super(struct super_block *sb)
ac27a0ec 843{
617ba13b
MC		 844 struct ext4_sb_info *sbi = EXT4_SB(sb);
845 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 846 int i, err;
ac27a0ec 847
857ac889 848 ext4_unregister_li_request(sb);
e0ccfd95
CH		 849 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
850
4c0425ff
MC		 851 flush_workqueue(sbi->dio_unwritten_wq);
852 destroy_workqueue(sbi->dio_unwritten_wq);
853
0390131b
FM		 854 if (sbi->s_journal) {
855 err = jbd2_journal_destroy(sbi->s_journal);
856 sbi->s_journal = NULL;
857 if (err < 0)
c67d859e 858 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 859 }
d4edac31 860
a1c6c569 861 del_timer(&sbi->s_err_report);
d4edac31
JB		 862 ext4_release_system_zone(sb);
863 ext4_mb_release(sb);
864 ext4_ext_release(sb);
865 ext4_xattr_put_super(sb);
866
ac27a0ec 867 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 868 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 869 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 870 }
58c5873a 871 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 872 ext4_commit_super(sb, 1);
873
240799cd 874 if (sbi->s_proc) {
66acdcf4 875 remove_proc_entry("options", sbi->s_proc);
9f6200bb 876 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 877 }
3197ebdb 878 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 879
880 for (i = 0; i < sbi->s_gdb_count; i++)
881 brelse(sbi->s_group_desc[i]);
f18a5f21 882 ext4_kvfree(sbi->s_group_desc);
9933fc0a 883 ext4_kvfree(sbi->s_flex_groups);
57042651 884 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 885 percpu_counter_destroy(&sbi->s_freeinodes_counter);
886 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 887 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 888 brelse(sbi->s_sbh);
889#ifdef CONFIG_QUOTA
890 for (i = 0; i < MAXQUOTAS; i++)
891 kfree(sbi->s_qf_names[i]);
892#endif
893
894 /* Debugging code just in case the in-memory inode orphan list
895 * isn't empty. The on-disk one can be non-empty if we've
896 * detected an error and taken the fs readonly, but the
897 * in-memory list had better be clean by this point. */
898 if (!list_empty(&sbi->s_orphan))
899 dump_orphan_list(sb, sbi);
900 J_ASSERT(list_empty(&sbi->s_orphan));
901
f98393a6 902 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 903 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
904 /*
905 * Invalidate the journal device's buffers. We don't want them
906 * floating about in memory - the physical journal device may
907 * hotswapped, and it breaks the `ro-after' testing code.
908 */
909 sync_blockdev(sbi->journal_bdev);
f98393a6 910 invalidate_bdev(sbi->journal_bdev);
617ba13b 911 ext4_blkdev_remove(sbi);
ac27a0ec 912 }
c5e06d10
JL		 913 if (sbi->s_mmp_tsk)
914 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 915 sb->s_fs_info = NULL;
3197ebdb
TT		 916 /*
917 * Now that we are completely done shutting down the
918 * superblock, we need to actually destroy the kobject.
919 */
3197ebdb
TT		 920 kobject_put(&sbi->s_kobj);
921 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 922 if (sbi->s_chksum_driver)
923 crypto_free_shash(sbi->s_chksum_driver);
705895b6 924 kfree(sbi->s_blockgroup_lock);
ac27a0ec 925 kfree(sbi);
ac27a0ec
DK		 926}
927
e18b890b 928static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 929
930/*
931 * Called inside transaction, so use GFP_NOFS
932 */
617ba13b 933static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 934{
617ba13b 935 struct ext4_inode_info *ei;
ac27a0ec 936
e6b4f8da 937 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 938 if (!ei)
939 return NULL;
0b8e58a1 940
ac27a0ec 941 ei->vfs_inode.i_version = 1;
a86c6181 942 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 943 INIT_LIST_HEAD(&ei->i_prealloc_list);
944 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 945 ext4_es_init_tree(&ei->i_es_tree);
946 rwlock_init(&ei->i_es_lock);
d2a17637
MC		 947 ei->i_reserved_data_blocks = 0;
948 ei->i_reserved_meta_blocks = 0;
949 ei->i_allocated_meta_blocks = 0;
9d0be502 950 ei->i_da_metadata_calc_len = 0;
7e731bc9 951 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 952 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 953#ifdef CONFIG_QUOTA
954 ei->i_reserved_quota = 0;
955#endif
8aefcd55 956 ei->jinode = NULL;
c7064ef1 957 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 958 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 959 ei->i_sync_tid = 0;
960 ei->i_datasync_tid = 0;
f7ad6d2e 961 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 962 atomic_set(&ei->i_unwritten, 0);
0b8e58a1 963
ac27a0ec
DK		 964 return &ei->vfs_inode;
965}
966
7ff9c073
TT		 967static int ext4_drop_inode(struct inode *inode)
968{
969 int drop = generic_drop_inode(inode);
970
971 trace_ext4_drop_inode(inode, drop);
972 return drop;
973}
974
fa0d7e3d
NP		 975static void ext4_i_callback(struct rcu_head *head)
976{
977 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 978 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
979}
980
617ba13b 981static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 982{
9f7dd93d 983 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 984 ext4_msg(inode->i_sb, KERN_ERR,
985 "Inode %lu (%p): orphan list check failed!",
986 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 987 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
988 EXT4_I(inode), sizeof(struct ext4_inode_info),
989 true);
990 dump_stack();
991 }
fa0d7e3d 992 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 993}
994
51cc5068 995static void init_once(void *foo)
ac27a0ec 996{
617ba13b 997 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 998
a35afb83 999 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1000 init_rwsem(&ei->xattr_sem);
0e855ac8 1001 init_rwsem(&ei->i_data_sem);
a35afb83 1002 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1003}
1004
1005static int init_inodecache(void)
1006{
617ba13b
MC		 1007 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1008 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 1009 0, (SLAB_RECLAIM_ACCOUNT|
1010 SLAB_MEM_SPREAD),
20c2df83 1011 init_once);
617ba13b 1012 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1013 return -ENOMEM;
1014 return 0;
1015}
1016
1017static void destroy_inodecache(void)
1018{
8c0a8537
KS		 1019 /*
1020 * Make sure all delayed rcu free inodes are flushed before we
1021 * destroy cache.
1022 */
1023 rcu_barrier();
617ba13b 1024 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1025}
1026
0930fcc1 1027void ext4_clear_inode(struct inode *inode)
ac27a0ec 1028{
0930fcc1 1029 invalidate_inode_buffers(inode);
dbd5768f 1030 clear_inode(inode);
9f754758 1031 dquot_drop(inode);
c2ea3fde 1032 ext4_discard_preallocations(inode);
51865fda 1033 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1034 if (EXT4_I(inode)->jinode) {
1035 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1036 EXT4_I(inode)->jinode);
1037 jbd2_free_inode(EXT4_I(inode)->jinode);
1038 EXT4_I(inode)->jinode = NULL;
1039 }
ac27a0ec
DK		 1040}
1041
1b961ac0 1042static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1043 u64 ino, u32 generation)
ac27a0ec 1044{
ac27a0ec 1045 struct inode *inode;
ac27a0ec 1046
617ba13b 1047 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1048 return ERR_PTR(-ESTALE);
617ba13b 1049 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1050 return ERR_PTR(-ESTALE);
1051
1052 /* iget isn't really right if the inode is currently unallocated!!
1053 *
617ba13b 1054 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1055 * deleted, so we should be safe.
1056 *
1057 * Currently we don't know the generation for parent directory, so
1058 * a generation of 0 means "accept any"
1059 */
1d1fe1ee
DH		 1060 inode = ext4_iget(sb, ino);
1061 if (IS_ERR(inode))
1062 return ERR_CAST(inode);
1063 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1064 iput(inode);
1065 return ERR_PTR(-ESTALE);
1066 }
1b961ac0
CH		 1067
1068 return inode;
1069}
1070
1071static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1072 int fh_len, int fh_type)
1b961ac0
CH		 1073{
1074 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1075 ext4_nfs_get_inode);
1076}
1077
1078static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1079 int fh_len, int fh_type)
1b961ac0
CH		 1080{
1081 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1082 ext4_nfs_get_inode);
ac27a0ec
DK		 1083}
1084
c39a7f84
TO		 1085/*
1086 * Try to release metadata pages (indirect blocks, directories) which are
1087 * mapped via the block device. Since these pages could have journal heads
1088 * which would prevent try_to_free_buffers() from freeing them, we must use
1089 * jbd2 layer's try_to_free_buffers() function to release them.
1090 */
0b8e58a1
AD		 1091static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1092 gfp_t wait)
c39a7f84
TO		 1093{
1094 journal_t *journal = EXT4_SB(sb)->s_journal;
1095
1096 WARN_ON(PageChecked(page));
1097 if (!page_has_buffers(page))
1098 return 0;
1099 if (journal)
1100 return jbd2_journal_try_to_free_buffers(journal, page,
1101 wait & ~__GFP_WAIT);
1102 return try_to_free_buffers(page);
1103}
1104
ac27a0ec 1105#ifdef CONFIG_QUOTA
af5bc92d 1106#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1107#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1108
617ba13b
MC		 1109static int ext4_write_dquot(struct dquot *dquot);
1110static int ext4_acquire_dquot(struct dquot *dquot);
1111static int ext4_release_dquot(struct dquot *dquot);
1112static int ext4_mark_dquot_dirty(struct dquot *dquot);
1113static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1114static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1115 struct path *path);
7c319d32
AK		 1116static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1117 int format_id);
ca0e05e4 1118static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1119static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1120static int ext4_quota_on_mount(struct super_block *sb, int type);
1121static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1122 size_t len, loff_t off);
617ba13b 1123static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1124 const char *data, size_t len, loff_t off);
7c319d32
AK		 1125static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1126 unsigned int flags);
1127static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1128
61e225dc 1129static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1130 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1131 .write_dquot = ext4_write_dquot,
1132 .acquire_dquot = ext4_acquire_dquot,
1133 .release_dquot = ext4_release_dquot,
1134 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1135 .write_info = ext4_write_info,
1136 .alloc_dquot = dquot_alloc,
1137 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1138};
1139
0d54b217 1140static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1141 .quota_on = ext4_quota_on,
ca0e05e4 1142 .quota_off = ext4_quota_off,
287a8095
CH		 1143 .quota_sync = dquot_quota_sync,
1144 .get_info = dquot_get_dqinfo,
1145 .set_info = dquot_set_dqinfo,
1146 .get_dqblk = dquot_get_dqblk,
1147 .set_dqblk = dquot_set_dqblk
ac27a0ec 1148};
7c319d32
AK		 1149
1150static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1151 .quota_on_meta = ext4_quota_on_sysfile,
1152 .quota_off = ext4_quota_off_sysfile,
1153 .quota_sync = dquot_quota_sync,
1154 .get_info = dquot_get_dqinfo,
1155 .set_info = dquot_set_dqinfo,
1156 .get_dqblk = dquot_get_dqblk,
1157 .set_dqblk = dquot_set_dqblk
1158};
ac27a0ec
DK		 1159#endif
1160
ee9b6d61 1161static const struct super_operations ext4_sops = {
617ba13b
MC		 1162 .alloc_inode = ext4_alloc_inode,
1163 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1164 .write_inode = ext4_write_inode,
1165 .dirty_inode = ext4_dirty_inode,
7ff9c073 1166 .drop_inode = ext4_drop_inode,
0930fcc1 1167 .evict_inode = ext4_evict_inode,
617ba13b 1168 .put_super = ext4_put_super,
617ba13b 1169 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1170 .freeze_fs = ext4_freeze,
1171 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1172 .statfs = ext4_statfs,
1173 .remount_fs = ext4_remount,
617ba13b 1174 .show_options = ext4_show_options,
ac27a0ec 1175#ifdef CONFIG_QUOTA
617ba13b
MC		 1176 .quota_read = ext4_quota_read,
1177 .quota_write = ext4_quota_write,
ac27a0ec 1178#endif
c39a7f84 1179 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1180};
1181
9ca92389
TT		 1182static const struct super_operations ext4_nojournal_sops = {
1183 .alloc_inode = ext4_alloc_inode,
1184 .destroy_inode = ext4_destroy_inode,
1185 .write_inode = ext4_write_inode,
1186 .dirty_inode = ext4_dirty_inode,
7ff9c073 1187 .drop_inode = ext4_drop_inode,
0930fcc1 1188 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1189 .put_super = ext4_put_super,
1190 .statfs = ext4_statfs,
1191 .remount_fs = ext4_remount,
9ca92389
TT		 1192 .show_options = ext4_show_options,
1193#ifdef CONFIG_QUOTA
1194 .quota_read = ext4_quota_read,
1195 .quota_write = ext4_quota_write,
1196#endif
1197 .bdev_try_to_free_page = bdev_try_to_free_page,
1198};
1199
39655164 1200static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1201 .fh_to_dentry = ext4_fh_to_dentry,
1202 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1203 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1204};
1205
1206enum {
1207 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1208 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1209 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1210 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1211 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1212 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1213 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1214 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1215 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1216 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1217 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1218 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1219 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1220 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1221 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1222 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1223 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1224 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1225 Opt_max_dir_size_kb,
ac27a0ec
DK		 1226};
1227
a447c093 1228static const match_table_t tokens = {
ac27a0ec
DK		 1229 {Opt_bsd_df, "bsddf"},
1230 {Opt_minix_df, "minixdf"},
1231 {Opt_grpid, "grpid"},
1232 {Opt_grpid, "bsdgroups"},
1233 {Opt_nogrpid, "nogrpid"},
1234 {Opt_nogrpid, "sysvgroups"},
1235 {Opt_resgid, "resgid=%u"},
1236 {Opt_resuid, "resuid=%u"},
1237 {Opt_sb, "sb=%u"},
1238 {Opt_err_cont, "errors=continue"},
1239 {Opt_err_panic, "errors=panic"},
1240 {Opt_err_ro, "errors=remount-ro"},
1241 {Opt_nouid32, "nouid32"},
ac27a0ec 1242 {Opt_debug, "debug"},
72578c33
TT		 1243 {Opt_removed, "oldalloc"},
1244 {Opt_removed, "orlov"},
ac27a0ec
DK		 1245 {Opt_user_xattr, "user_xattr"},
1246 {Opt_nouser_xattr, "nouser_xattr"},
1247 {Opt_acl, "acl"},
1248 {Opt_noacl, "noacl"},
e3bb52ae 1249 {Opt_noload, "norecovery"},
5a916be1 1250 {Opt_noload, "noload"},
72578c33
TT		 1251 {Opt_removed, "nobh"},
1252 {Opt_removed, "bh"},
ac27a0ec 1253 {Opt_commit, "commit=%u"},
30773840
TT		 1254 {Opt_min_batch_time, "min_batch_time=%u"},
1255 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1256 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1257 {Opt_journal_checksum, "journal_checksum"},
1258 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1259 {Opt_abort, "abort"},
1260 {Opt_data_journal, "data=journal"},
1261 {Opt_data_ordered, "data=ordered"},
1262 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1263 {Opt_data_err_abort, "data_err=abort"},
1264 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1265 {Opt_offusrjquota, "usrjquota="},
1266 {Opt_usrjquota, "usrjquota=%s"},
1267 {Opt_offgrpjquota, "grpjquota="},
1268 {Opt_grpjquota, "grpjquota=%s"},
1269 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1270 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1271 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1272 {Opt_grpquota, "grpquota"},
1273 {Opt_noquota, "noquota"},
1274 {Opt_quota, "quota"},
1275 {Opt_usrquota, "usrquota"},
1276 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1277 {Opt_barrier, "barrier"},
1278 {Opt_nobarrier, "nobarrier"},
25ec56b5 1279 {Opt_i_version, "i_version"},
c9de560d 1280 {Opt_stripe, "stripe=%u"},
64769240 1281 {Opt_delalloc, "delalloc"},
dd919b98 1282 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1283 {Opt_mblk_io_submit, "mblk_io_submit"},
1284 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1285 {Opt_block_validity, "block_validity"},
1286 {Opt_noblock_validity, "noblock_validity"},
240799cd 1287 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1288 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1289 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1290 {Opt_auto_da_alloc, "auto_da_alloc"},
1291 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1292 {Opt_dioread_nolock, "dioread_nolock"},
1293 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1294 {Opt_discard, "discard"},
1295 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1296 {Opt_init_itable, "init_itable=%u"},
1297 {Opt_init_itable, "init_itable"},
1298 {Opt_noinit_itable, "noinit_itable"},
df981d03 1299 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1300 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1301 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1302 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1303 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1304 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1305 {Opt_err, NULL},
ac27a0ec
DK		 1306};
1307
617ba13b 1308static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1309{
617ba13b 1310 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1311 char *options = (char *) *data;
1312
1313 if (!options || strncmp(options, "sb=", 3) != 0)
1314 return 1; /* Default location */
0b8e58a1 1315
ac27a0ec 1316 options += 3;
0b8e58a1 1317 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1318 sb_block = simple_strtoul(options, &options, 0);
1319 if (*options && *options != ',') {
4776004f 1320 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1321 (char *) *data);
1322 return 1;
1323 }
1324 if (*options == ',')
1325 options++;
1326 *data = (void *) options;
0b8e58a1 1327
ac27a0ec
DK		 1328 return sb_block;
1329}
1330
b3881f74 1331#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1332static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1333 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1334
56c50f11
DM		 1335#ifdef CONFIG_QUOTA
1336static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1337{
1338 struct ext4_sb_info *sbi = EXT4_SB(sb);
1339 char *qname;
1340
1341 if (sb_any_quota_loaded(sb) &&
1342 !sbi->s_qf_names[qtype]) {
1343 ext4_msg(sb, KERN_ERR,
1344 "Cannot change journaled "
1345 "quota options when quota turned on");
57f73c2c 1346 return -1;
56c50f11
DM		 1347 }
1348 qname = match_strdup(args);
1349 if (!qname) {
1350 ext4_msg(sb, KERN_ERR,
1351 "Not enough memory for storing quotafile name");
57f73c2c 1352 return -1;
56c50f11
DM		 1353 }
1354 if (sbi->s_qf_names[qtype] &&
1355 strcmp(sbi->s_qf_names[qtype], qname)) {
1356 ext4_msg(sb, KERN_ERR,
1357 "%s quota file already specified", QTYPE2NAME(qtype));
1358 kfree(qname);
57f73c2c 1359 return -1;
56c50f11
DM		 1360 }
1361 sbi->s_qf_names[qtype] = qname;
1362 if (strchr(sbi->s_qf_names[qtype], '/')) {
1363 ext4_msg(sb, KERN_ERR,
1364 "quotafile must be on filesystem root");
1365 kfree(sbi->s_qf_names[qtype]);
1366 sbi->s_qf_names[qtype] = NULL;
57f73c2c 1367 return -1;
56c50f11 1368 }
fd8c37ec 1369 set_opt(sb, QUOTA);
56c50f11
DM		 1370 return 1;
1371}
1372
1373static int clear_qf_name(struct super_block *sb, int qtype)
1374{
1375
1376 struct ext4_sb_info *sbi = EXT4_SB(sb);
1377
1378 if (sb_any_quota_loaded(sb) &&
1379 sbi->s_qf_names[qtype]) {
1380 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1381 " when quota turned on");
57f73c2c 1382 return -1;
56c50f11
DM		 1383 }
1384 /*
1385 * The space will be released later when all options are confirmed
1386 * to be correct
1387 */
1388 sbi->s_qf_names[qtype] = NULL;
1389 return 1;
1390}
1391#endif
1392
26092bf5
TT		 1393#define MOPT_SET 0x0001
1394#define MOPT_CLEAR 0x0002
1395#define MOPT_NOSUPPORT 0x0004
1396#define MOPT_EXPLICIT 0x0008
1397#define MOPT_CLEAR_ERR 0x0010
1398#define MOPT_GTE0 0x0020
ac27a0ec 1399#ifdef CONFIG_QUOTA
26092bf5
TT		 1400#define MOPT_Q 0
1401#define MOPT_QFMT 0x0040
1402#else
1403#define MOPT_Q MOPT_NOSUPPORT
1404#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1405#endif
26092bf5
TT		 1406#define MOPT_DATAJ 0x0080
1407
1408static const struct mount_opts {
1409 int token;
1410 int mount_opt;
1411 int flags;
1412} ext4_mount_opts[] = {
1413 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1414 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1415 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1416 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1417 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1418 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1419 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1420 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1421 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1422 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1423 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1424 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1425 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1426 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1427 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1428 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1429 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1430 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1431 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1432 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1433 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1434 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1435 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1436 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1437 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1438 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1439 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1440 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1441 {Opt_commit, 0, MOPT_GTE0},
1442 {Opt_max_batch_time, 0, MOPT_GTE0},
1443 {Opt_min_batch_time, 0, MOPT_GTE0},
1444 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1445 {Opt_init_itable, 0, MOPT_GTE0},
1446 {Opt_stripe, 0, MOPT_GTE0},
1447 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1448 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1449 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
26092bf5
TT		 1450 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1451 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1452#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1453 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1454 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1455#else
26092bf5
TT		 1456 {Opt_acl, 0, MOPT_NOSUPPORT},
1457 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1458#endif
26092bf5
TT		 1459 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1460 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1461 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1462 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1463 MOPT_SET | MOPT_Q},
1464 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1465 MOPT_SET | MOPT_Q},
1466 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1467 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1468 {Opt_usrjquota, 0, MOPT_Q},
1469 {Opt_grpjquota, 0, MOPT_Q},
1470 {Opt_offusrjquota, 0, MOPT_Q},
1471 {Opt_offgrpjquota, 0, MOPT_Q},
1472 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1473 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1474 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1475 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1476 {Opt_err, 0, 0}
1477};
1478
1479static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1480 substring_t *args, unsigned long *journal_devnum,
1481 unsigned int *journal_ioprio, int is_remount)
1482{
1483 struct ext4_sb_info *sbi = EXT4_SB(sb);
1484 const struct mount_opts *m;
08cefc7a
EB		 1485 kuid_t uid;
1486 kgid_t gid;
26092bf5
TT		 1487 int arg = 0;
1488
57f73c2c
TT		 1489#ifdef CONFIG_QUOTA
1490 if (token == Opt_usrjquota)
1491 return set_qf_name(sb, USRQUOTA, &args[0]);
1492 else if (token == Opt_grpjquota)
1493 return set_qf_name(sb, GRPQUOTA, &args[0]);
1494 else if (token == Opt_offusrjquota)
1495 return clear_qf_name(sb, USRQUOTA);
1496 else if (token == Opt_offgrpjquota)
1497 return clear_qf_name(sb, GRPQUOTA);
1498#endif
26092bf5
TT		 1499 if (args->from && match_int(args, &arg))
1500 return -1;
1501 switch (token) {
f7048605
TT		 1502 case Opt_noacl:
1503 case Opt_nouser_xattr:
1504 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1505 break;
26092bf5
TT		 1506 case Opt_sb:
1507 return 1; /* handled by get_sb_block() */
1508 case Opt_removed:
1509 ext4_msg(sb, KERN_WARNING,
1510 "Ignoring removed %s option", opt);
1511 return 1;
1512 case Opt_resuid:
08cefc7a
EB		 1513 uid = make_kuid(current_user_ns(), arg);
1514 if (!uid_valid(uid)) {
1515 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1516 return -1;
1517 }
1518 sbi->s_resuid = uid;
26092bf5
TT		 1519 return 1;
1520 case Opt_resgid:
08cefc7a
EB		 1521 gid = make_kgid(current_user_ns(), arg);
1522 if (!gid_valid(gid)) {
1523 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1524 return -1;
1525 }
1526 sbi->s_resgid = gid;
26092bf5
TT		 1527 return 1;
1528 case Opt_abort:
1529 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1530 return 1;
1531 case Opt_i_version:
1532 sb->s_flags |= MS_I_VERSION;
1533 return 1;
1534 case Opt_journal_dev:
1535 if (is_remount) {
1536 ext4_msg(sb, KERN_ERR,
1537 "Cannot specify journal on remount");
1538 return -1;
1539 }
1540 *journal_devnum = arg;
1541 return 1;
1542 case Opt_journal_ioprio:
1543 if (arg < 0 || arg > 7)
1544 return -1;
1545 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1546 return 1;
1547 }
1548
1549 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1550 if (token != m->token)
1551 continue;
1552 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1553 return -1;
1554 if (m->flags & MOPT_EXPLICIT)
1555 set_opt2(sb, EXPLICIT_DELALLOC);
1556 if (m->flags & MOPT_CLEAR_ERR)
1557 clear_opt(sb, ERRORS_MASK);
1558 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1559 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1560 "options when quota turned on");
1561 return -1;
1562 }
1563
1564 if (m->flags & MOPT_NOSUPPORT) {
1565 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1566 } else if (token == Opt_commit) {
1567 if (arg == 0)
1568 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1569 sbi->s_commit_interval = HZ * arg;
1570 } else if (token == Opt_max_batch_time) {
1571 if (arg == 0)
1572 arg = EXT4_DEF_MAX_BATCH_TIME;
1573 sbi->s_max_batch_time = arg;
1574 } else if (token == Opt_min_batch_time) {
1575 sbi->s_min_batch_time = arg;
1576 } else if (token == Opt_inode_readahead_blks) {
1577 if (arg > (1 << 30))
1578 return -1;
1579 if (arg && !is_power_of_2(arg)) {
b31e1552 1580 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1581 "EXT4-fs: inode_readahead_blks"
1582 " must be a power of 2");
1583 return -1;
ac27a0ec 1584 }
26092bf5
TT		 1585 sbi->s_inode_readahead_blks = arg;
1586 } else if (token == Opt_init_itable) {
1587 set_opt(sb, INIT_INODE_TABLE);
1588 if (!args->from)
1589 arg = EXT4_DEF_LI_WAIT_MULT;
1590 sbi->s_li_wait_mult = arg;
df981d03
TT		 1591 } else if (token == Opt_max_dir_size_kb) {
1592 sbi->s_max_dir_size_kb = arg;
26092bf5
TT		 1593 } else if (token == Opt_stripe) {
1594 sbi->s_stripe = arg;
1595 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1596 if (is_remount) {
eb513689
TT		 1597 if (!sbi->s_journal)
1598 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1599 else if (test_opt(sb, DATA_FLAGS) !=
1600 m->mount_opt) {
b31e1552 1601 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1602 "Cannot change data mode on remount");
1603 return -1;
ac27a0ec
DK		 1604 }
1605 } else {
fd8c37ec 1606 clear_opt(sb, DATA_FLAGS);
26092bf5 1607 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1608 }
ac27a0ec 1609#ifdef CONFIG_QUOTA
26092bf5 1610 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1611 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1612 sbi->s_jquota_fmt != m->mount_opt) {
1613 ext4_msg(sb, KERN_ERR, "Cannot "
1614 "change journaled quota options "
1615 "when quota turned on");
1616 return -1;
ac27a0ec 1617 }
26092bf5 1618 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1619#endif
26092bf5
TT		 1620 } else {
1621 if (!args->from)
1622 arg = 1;
1623 if (m->flags & MOPT_CLEAR)
1624 arg = !arg;
1625 else if (unlikely(!(m->flags & MOPT_SET))) {
1626 ext4_msg(sb, KERN_WARNING,
1627 "buggy handling of option %s", opt);
1628 WARN_ON(1);
1629 return -1;
3197ebdb 1630 }
26092bf5
TT		 1631 if (arg != 0)
1632 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1633 else
26092bf5 1634 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1635 }
26092bf5
TT		 1636 return 1;
1637 }
1638 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1639 "or missing value", opt);
1640 return -1;
1641}
1642
1643static int parse_options(char *options, struct super_block *sb,
1644 unsigned long *journal_devnum,
1645 unsigned int *journal_ioprio,
1646 int is_remount)
1647{
1648 struct ext4_sb_info *sbi = EXT4_SB(sb);
1649 char *p;
1650 substring_t args[MAX_OPT_ARGS];
1651 int token;
1652
1653 if (!options)
1654 return 1;
1655
1656 while ((p = strsep(&options, ",")) != NULL) {
1657 if (!*p)
1658 continue;
1659 /*
1660 * Initialize args struct so we know whether arg was
1661 * found; some options take optional arguments.
1662 */
caecd0af 1663 args[0].to = args[0].from = NULL;
26092bf5
TT		 1664 token = match_token(p, tokens, args);
1665 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1666 journal_ioprio, is_remount) < 0)
1667 return 0;
ac27a0ec
DK		 1668 }
1669#ifdef CONFIG_QUOTA
1670 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1671 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1672 clear_opt(sb, USRQUOTA);
ac27a0ec 1673
482a7425 1674 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1675 clear_opt(sb, GRPQUOTA);
ac27a0ec 1676
56c50f11 1677 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1678 ext4_msg(sb, KERN_ERR, "old and new quota "
1679 "format mixing");
ac27a0ec
DK		 1680 return 0;
1681 }
1682
1683 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1684 ext4_msg(sb, KERN_ERR, "journaled quota format "
1685 "not specified");
ac27a0ec
DK		 1686 return 0;
1687 }
1688 } else {
1689 if (sbi->s_jquota_fmt) {
b31e1552 1690 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1691 "specified with no journaling "
b31e1552 1692 "enabled");
ac27a0ec
DK		 1693 return 0;
1694 }
1695 }
1696#endif
261cb20c
JK		 1697 if (test_opt(sb, DIOREAD_NOLOCK)) {
1698 int blocksize =
1699 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1700
1701 if (blocksize < PAGE_CACHE_SIZE) {
1702 ext4_msg(sb, KERN_ERR, "can't mount with "
1703 "dioread_nolock if block size != PAGE_SIZE");
1704 return 0;
1705 }
1706 }
ac27a0ec
DK		 1707 return 1;
1708}
1709
2adf6da8
TT		 1710static inline void ext4_show_quota_options(struct seq_file *seq,
1711 struct super_block *sb)
1712{
1713#if defined(CONFIG_QUOTA)
1714 struct ext4_sb_info *sbi = EXT4_SB(sb);
1715
1716 if (sbi->s_jquota_fmt) {
1717 char *fmtname = "";
1718
1719 switch (sbi->s_jquota_fmt) {
1720 case QFMT_VFS_OLD:
1721 fmtname = "vfsold";
1722 break;
1723 case QFMT_VFS_V0:
1724 fmtname = "vfsv0";
1725 break;
1726 case QFMT_VFS_V1:
1727 fmtname = "vfsv1";
1728 break;
1729 }
1730 seq_printf(seq, ",jqfmt=%s", fmtname);
1731 }
1732
1733 if (sbi->s_qf_names[USRQUOTA])
1734 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1735
1736 if (sbi->s_qf_names[GRPQUOTA])
1737 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1738
1739 if (test_opt(sb, USRQUOTA))
1740 seq_puts(seq, ",usrquota");
1741
1742 if (test_opt(sb, GRPQUOTA))
1743 seq_puts(seq, ",grpquota");
1744#endif
1745}
1746
5a916be1
TT		 1747static const char *token2str(int token)
1748{
50df9fd5 1749 const struct match_token *t;
5a916be1
TT		 1750
1751 for (t = tokens; t->token != Opt_err; t++)
1752 if (t->token == token && !strchr(t->pattern, '='))
1753 break;
1754 return t->pattern;
1755}
1756
2adf6da8
TT		 1757/*
1758 * Show an option if
1759 * - it's set to a non-default value OR
1760 * - if the per-sb default is different from the global default
1761 */
66acdcf4
TT		 1762static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1763 int nodefs)
2adf6da8 1764{
2adf6da8
TT		 1765 struct ext4_sb_info *sbi = EXT4_SB(sb);
1766 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1767 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1768 const struct mount_opts *m;
66acdcf4 1769 char sep = nodefs ? '\n' : ',';
2adf6da8 1770
66acdcf4
TT		 1771#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1772#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1773
1774 if (sbi->s_sb_block != 1)
5a916be1
TT		 1775 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1776
1777 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1778 int want_set = m->flags & MOPT_SET;
1779 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1780 (m->flags & MOPT_CLEAR_ERR))
1781 continue;
66acdcf4 1782 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1783 continue; /* skip if same as the default */
1784 if ((want_set &&
1785 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1786 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1787 continue; /* select Opt_noFoo vs Opt_Foo */
1788 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1789 }
5a916be1 1790
08cefc7a 1791 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1792 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1793 SEQ_OPTS_PRINT("resuid=%u",
1794 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1795 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1796 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1797 SEQ_OPTS_PRINT("resgid=%u",
1798 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1799 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1800 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1801 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1802 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1803 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1804 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1805 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1806 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1807 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1808 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1809 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1810 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1811 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1812 if (sb->s_flags & MS_I_VERSION)
5a916be1 1813 SEQ_OPTS_PUTS("i_version");
66acdcf4 1814 if (nodefs || sbi->s_stripe)
5a916be1 1815 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1816 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1817 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1818 SEQ_OPTS_PUTS("data=journal");
1819 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1820 SEQ_OPTS_PUTS("data=ordered");
1821 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1822 SEQ_OPTS_PUTS("data=writeback");
1823 }
66acdcf4
TT		 1824 if (nodefs ||
1825 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1826 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1827 sbi->s_inode_readahead_blks);
2adf6da8 1828
66acdcf4
TT		 1829 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1830 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1831 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1832 if (nodefs || sbi->s_max_dir_size_kb)
1833 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1834
1835 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1836 return 0;
1837}
1838
66acdcf4
TT		 1839static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1840{
1841 return _ext4_show_options(seq, root->d_sb, 0);
1842}
1843
1844static int options_seq_show(struct seq_file *seq, void *offset)
1845{
1846 struct super_block *sb = seq->private;
1847 int rc;
1848
1849 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1850 rc = _ext4_show_options(seq, sb, 1);
1851 seq_puts(seq, "\n");
1852 return rc;
1853}
1854
1855static int options_open_fs(struct inode *inode, struct file *file)
1856{
1857 return single_open(file, options_seq_show, PDE(inode)->data);
1858}
1859
1860static const struct file_operations ext4_seq_options_fops = {
1861 .owner = THIS_MODULE,
1862 .open = options_open_fs,
1863 .read = seq_read,
1864 .llseek = seq_lseek,
1865 .release = single_release,
1866};
1867
617ba13b 1868static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1869 int read_only)
1870{
617ba13b 1871 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1872 int res = 0;
1873
617ba13b 1874 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1875 ext4_msg(sb, KERN_ERR, "revision level too high, "
1876 "forcing read-only mode");
ac27a0ec
DK		 1877 res = MS_RDONLY;
1878 }
1879 if (read_only)
281b5995 1880 goto done;
617ba13b 1881 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1882 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1883 "running e2fsck is recommended");
617ba13b 1884 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1885 ext4_msg(sb, KERN_WARNING,
1886 "warning: mounting fs with errors, "
1887 "running e2fsck is recommended");
ed3ce80a 1888 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1889 le16_to_cpu(es->s_mnt_count) >=
1890 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1891 ext4_msg(sb, KERN_WARNING,
1892 "warning: maximal mount count reached, "
1893 "running e2fsck is recommended");
ac27a0ec
DK		 1894 else if (le32_to_cpu(es->s_checkinterval) &&
1895 (le32_to_cpu(es->s_lastcheck) +
1896 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1897 ext4_msg(sb, KERN_WARNING,
1898 "warning: checktime reached, "
1899 "running e2fsck is recommended");
0b8e58a1 1900 if (!sbi->s_journal)
0390131b 1901 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1902 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1903 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1904 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1905 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1906 ext4_update_dynamic_rev(sb);
0390131b
FM		 1907 if (sbi->s_journal)
1908 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1909
e2d67052 1910 ext4_commit_super(sb, 1);
281b5995 1911done:
ac27a0ec 1912 if (test_opt(sb, DEBUG))
a9df9a49 1913 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1914 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1915 sb->s_blocksize,
1916 sbi->s_groups_count,
617ba13b
MC		 1917 EXT4_BLOCKS_PER_GROUP(sb),
1918 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1919 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1920
7abc52c2 1921 cleancache_init_fs(sb);
ac27a0ec
DK		 1922 return res;
1923}
1924
117fff10
TT		 1925int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1926{
1927 struct ext4_sb_info *sbi = EXT4_SB(sb);
1928 struct flex_groups *new_groups;
1929 int size;
1930
1931 if (!sbi->s_log_groups_per_flex)
1932 return 0;
1933
1934 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1935 if (size <= sbi->s_flex_groups_allocated)
1936 return 0;
1937
1938 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1939 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1940 if (!new_groups) {
1941 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1942 size / (int) sizeof(struct flex_groups));
1943 return -ENOMEM;
1944 }
1945
1946 if (sbi->s_flex_groups) {
1947 memcpy(new_groups, sbi->s_flex_groups,
1948 (sbi->s_flex_groups_allocated *
1949 sizeof(struct flex_groups)));
1950 ext4_kvfree(sbi->s_flex_groups);
1951 }
1952 sbi->s_flex_groups = new_groups;
1953 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1954 return 0;
1955}
1956
772cb7c8
JS		 1957static int ext4_fill_flex_info(struct super_block *sb)
1958{
1959 struct ext4_sb_info *sbi = EXT4_SB(sb);
1960 struct ext4_group_desc *gdp = NULL;
772cb7c8 1961 ext4_group_t flex_group;
d50f2ab6 1962 unsigned int groups_per_flex = 0;
117fff10 1963 int i, err;
772cb7c8 1964
503358ae 1965 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1966 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1967 sbi->s_log_groups_per_flex = 0;
1968 return 1;
1969 }
76495ec1 1970 groups_per_flex = 1U << sbi->s_log_groups_per_flex;
772cb7c8 1971
117fff10
TT		 1972 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1973 if (err)
9933fc0a 1974 goto failed;
772cb7c8 1975
772cb7c8 1976 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1977 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1978
1979 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1980 atomic_add(ext4_free_inodes_count(sb, gdp),
1981 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1982 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1983 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1984 atomic_add(ext4_used_dirs_count(sb, gdp),
1985 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1986 }
1987
1988 return 1;
1989failed:
1990 return 0;
1991}
1992
feb0ab32
DW		 1993static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1994 struct ext4_group_desc *gdp)
717d50e4 1995{
feb0ab32 1996 int offset;
717d50e4 1997 __u16 crc = 0;
feb0ab32 1998 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1999
feb0ab32
DW		 2000 if ((sbi->s_es->s_feature_ro_compat &
2001 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2002 /* Use new metadata_csum algorithm */
2003 __u16 old_csum;
2004 __u32 csum32;
2005
2006 old_csum = gdp->bg_checksum;
2007 gdp->bg_checksum = 0;
2008 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2009 sizeof(le_group));
2010 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2011 sbi->s_desc_size);
2012 gdp->bg_checksum = old_csum;
2013
2014 crc = csum32 & 0xFFFF;
2015 goto out;
717d50e4
AD		 2016 }
2017
feb0ab32
DW		 2018 /* old crc16 code */
2019 offset = offsetof(struct ext4_group_desc, bg_checksum);
2020
2021 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2022 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2023 crc = crc16(crc, (__u8 *)gdp, offset);
2024 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2025 /* for checksum of struct ext4_group_desc do the rest...*/
2026 if ((sbi->s_es->s_feature_incompat &
2027 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2028 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2029 crc = crc16(crc, (__u8 *)gdp + offset,
2030 le16_to_cpu(sbi->s_es->s_desc_size) -
2031 offset);
2032
2033out:
717d50e4
AD		 2034 return cpu_to_le16(crc);
2035}
2036
feb0ab32 2037int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2038 struct ext4_group_desc *gdp)
2039{
feb0ab32
DW		 2040 if (ext4_has_group_desc_csum(sb) &&
2041 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2042 block_group, gdp)))
717d50e4
AD		 2043 return 0;
2044
2045 return 1;
2046}
2047
feb0ab32
DW		 2048void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2049 struct ext4_group_desc *gdp)
2050{
2051 if (!ext4_has_group_desc_csum(sb))
2052 return;
2053 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2054}
2055
ac27a0ec 2056/* Called at mount-time, super-block is locked */
bfff6873
LC		 2057static int ext4_check_descriptors(struct super_block *sb,
2058 ext4_group_t *first_not_zeroed)
ac27a0ec 2059{
617ba13b
MC		 2060 struct ext4_sb_info *sbi = EXT4_SB(sb);
2061 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2062 ext4_fsblk_t last_block;
bd81d8ee
LV		 2063 ext4_fsblk_t block_bitmap;
2064 ext4_fsblk_t inode_bitmap;
2065 ext4_fsblk_t inode_table;
ce421581 2066 int flexbg_flag = 0;
bfff6873 2067 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2068
ce421581
JS		 2069 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2070 flexbg_flag = 1;
2071
af5bc92d 2072 ext4_debug("Checking group descriptors");
ac27a0ec 2073
197cd65a
AM		 2074 for (i = 0; i < sbi->s_groups_count; i++) {
2075 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2076
ce421581 2077 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2078 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2079 else
2080 last_block = first_block +
617ba13b 2081 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2082
bfff6873
LC		 2083 if ((grp == sbi->s_groups_count) &&
2084 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2085 grp = i;
2086
8fadc143 2087 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2088 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2089 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2090 "Block bitmap for group %u not in group "
b31e1552 2091 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2092 return 0;
2093 }
8fadc143 2094 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2095 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2096 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2097 "Inode bitmap for group %u not in group "
b31e1552 2098 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2099 return 0;
2100 }
8fadc143 2101 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2102 if (inode_table < first_block ||
2b2d6d01 2103 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2104 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2105 "Inode table for group %u not in group "
b31e1552 2106 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2107 return 0;
2108 }
955ce5f5 2109 ext4_lock_group(sb, i);
feb0ab32 2110 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2111 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2112 "Checksum for group %u failed (%u!=%u)",
2113 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2114 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2115 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2116 ext4_unlock_group(sb, i);
8a266467 2117 return 0;
7ee1ec4c 2118 }
717d50e4 2119 }
955ce5f5 2120 ext4_unlock_group(sb, i);
ce421581
JS		 2121 if (!flexbg_flag)
2122 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2123 }
bfff6873
LC		 2124 if (NULL != first_not_zeroed)
2125 *first_not_zeroed = grp;
ac27a0ec 2126
5dee5437
TT		 2127 ext4_free_blocks_count_set(sbi->s_es,
2128 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2129 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2130 return 1;
2131}
2132
617ba13b 2133/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2134 * the superblock) which were deleted from all directories, but held open by
2135 * a process at the time of a crash. We walk the list and try to delete these
2136 * inodes at recovery time (only with a read-write filesystem).
2137 *
2138 * In order to keep the orphan inode chain consistent during traversal (in
2139 * case of crash during recovery), we link each inode into the superblock
2140 * orphan list_head and handle it the same way as an inode deletion during
2141 * normal operation (which journals the operations for us).
2142 *
2143 * We only do an iget() and an iput() on each inode, which is very safe if we
2144 * accidentally point at an in-use or already deleted inode. The worst that
2145 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2146 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2147 * e2fsck was run on this filesystem, and it must have already done the orphan
2148 * inode cleanup for us, so we can safely abort without any further action.
2149 */
2b2d6d01
TT		 2150static void ext4_orphan_cleanup(struct super_block *sb,
2151 struct ext4_super_block *es)
ac27a0ec
DK		 2152{
2153 unsigned int s_flags = sb->s_flags;
2154 int nr_orphans = 0, nr_truncates = 0;
2155#ifdef CONFIG_QUOTA
2156 int i;
2157#endif
2158 if (!es->s_last_orphan) {
2159 jbd_debug(4, "no orphan inodes to clean up\n");
2160 return;
2161 }
2162
a8f48a95 2163 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2164 ext4_msg(sb, KERN_ERR, "write access "
2165 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2166 return;
2167 }
2168
d39195c3
AG		 2169 /* Check if feature set would not allow a r/w mount */
2170 if (!ext4_feature_set_ok(sb, 0)) {
2171 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2172 "unknown ROCOMPAT features");
2173 return;
2174 }
2175
617ba13b 2176 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2177 /* don't clear list on RO mount w/ errors */
2178 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
ac27a0ec
DK		 2179 jbd_debug(1, "Errors on filesystem, "
2180 "clearing orphan list.\n");
c25f9bc6
ES		 2181 es->s_last_orphan = 0;
2182 }
ac27a0ec
DK		 2183 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2184 return;
2185 }
2186
2187 if (s_flags & MS_RDONLY) {
b31e1552 2188 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2189 sb->s_flags &= ~MS_RDONLY;
2190 }
2191#ifdef CONFIG_QUOTA
2192 /* Needed for iput() to work correctly and not trash data */
2193 sb->s_flags |= MS_ACTIVE;
2194 /* Turn on quotas so that they are updated correctly */
2195 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2196 if (EXT4_SB(sb)->s_qf_names[i]) {
2197 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2198 if (ret < 0)
b31e1552
ES		 2199 ext4_msg(sb, KERN_ERR,
2200 "Cannot turn on journaled "
2201 "quota: error %d", ret);
ac27a0ec
DK		 2202 }
2203 }
2204#endif
2205
2206 while (es->s_last_orphan) {
2207 struct inode *inode;
2208
97bd42b9
JB		 2209 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2210 if (IS_ERR(inode)) {
ac27a0ec
DK		 2211 es->s_last_orphan = 0;
2212 break;
2213 }
2214
617ba13b 2215 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2216 dquot_initialize(inode);
ac27a0ec 2217 if (inode->i_nlink) {
b31e1552
ES		 2218 ext4_msg(sb, KERN_DEBUG,
2219 "%s: truncating inode %lu to %lld bytes",
46e665e9 2220 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2221 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2222 inode->i_ino, inode->i_size);
721e3eba 2223 mutex_lock(&inode->i_mutex);
617ba13b 2224 ext4_truncate(inode);
721e3eba 2225 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2226 nr_truncates++;
2227 } else {
b31e1552
ES		 2228 ext4_msg(sb, KERN_DEBUG,
2229 "%s: deleting unreferenced inode %lu",
46e665e9 2230 __func__, inode->i_ino);
ac27a0ec
DK		 2231 jbd_debug(2, "deleting unreferenced inode %lu\n",
2232 inode->i_ino);
2233 nr_orphans++;
2234 }
2235 iput(inode); /* The delete magic happens here! */
2236 }
2237
2b2d6d01 2238#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2239
2240 if (nr_orphans)
b31e1552
ES		 2241 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2242 PLURAL(nr_orphans));
ac27a0ec 2243 if (nr_truncates)
b31e1552
ES		 2244 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2245 PLURAL(nr_truncates));
ac27a0ec
DK		 2246#ifdef CONFIG_QUOTA
2247 /* Turn quotas off */
2248 for (i = 0; i < MAXQUOTAS; i++) {
2249 if (sb_dqopt(sb)->files[i])
287a8095 2250 dquot_quota_off(sb, i);
ac27a0ec
DK		 2251 }
2252#endif
2253 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2254}
0b8e58a1 2255
cd2291a4
ES		 2256/*
2257 * Maximal extent format file size.
2258 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2259 * extent format containers, within a sector_t, and within i_blocks
2260 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2261 * so that won't be a limiting factor.
2262 *
f17722f9
LC		 2263 * However there is other limiting factor. We do store extents in the form
2264 * of starting block and length, hence the resulting length of the extent
2265 * covering maximum file size must fit into on-disk format containers as
2266 * well. Given that length is always by 1 unit bigger than max unit (because
2267 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2268 *
cd2291a4
ES		 2269 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2270 */
f287a1a5 2271static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2272{
2273 loff_t res;
2274 loff_t upper_limit = MAX_LFS_FILESIZE;
2275
2276 /* small i_blocks in vfs inode? */
f287a1a5 2277 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2278 /*
90c699a9 2279 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2280 * i_block represent total blocks in 512 bytes
2281 * 32 == size of vfs inode i_blocks * 8
2282 */
2283 upper_limit = (1LL << 32) - 1;
2284
2285 /* total blocks in file system block size */
2286 upper_limit >>= (blkbits - 9);
2287 upper_limit <<= blkbits;
2288 }
2289
f17722f9
LC		 2290 /*
2291 * 32-bit extent-start container, ee_block. We lower the maxbytes
2292 * by one fs block, so ee_len can cover the extent of maximum file
2293 * size
2294 */
2295 res = (1LL << 32) - 1;
cd2291a4 2296 res <<= blkbits;
cd2291a4
ES		 2297
2298 /* Sanity check against vm- & vfs- imposed limits */
2299 if (res > upper_limit)
2300 res = upper_limit;
2301
2302 return res;
2303}
ac27a0ec 2304
ac27a0ec 2305/*
cd2291a4 2306 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2307 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2308 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2309 */
f287a1a5 2310static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2311{
617ba13b 2312 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2313 int meta_blocks;
2314 loff_t upper_limit;
0b8e58a1
AD		 2315 /* This is calculated to be the largest file size for a dense, block
2316 * mapped file such that the file's total number of 512-byte sectors,
2317 * including data and all indirect blocks, does not exceed (2^48 - 1).
2318 *
2319 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2320 * number of 512-byte sectors of the file.
0fc1b451
AK		 2321 */
2322
f287a1a5 2323 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2324 /*
90c699a9 2325 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2326 * the inode i_block field represents total file blocks in
2327 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2328 */
2329 upper_limit = (1LL << 32) - 1;
2330
2331 /* total blocks in file system block size */
2332 upper_limit >>= (bits - 9);
2333
2334 } else {
8180a562
AK		 2335 /*
2336 * We use 48 bit ext4_inode i_blocks
2337 * With EXT4_HUGE_FILE_FL set the i_blocks
2338 * represent total number of blocks in
2339 * file system block size
2340 */
0fc1b451
AK		 2341 upper_limit = (1LL << 48) - 1;
2342
0fc1b451
AK		 2343 }
2344
2345 /* indirect blocks */
2346 meta_blocks = 1;
2347 /* double indirect blocks */
2348 meta_blocks += 1 + (1LL << (bits-2));
2349 /* tripple indirect blocks */
2350 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2351
2352 upper_limit -= meta_blocks;
2353 upper_limit <<= bits;
ac27a0ec
DK		 2354
2355 res += 1LL << (bits-2);
2356 res += 1LL << (2*(bits-2));
2357 res += 1LL << (3*(bits-2));
2358 res <<= bits;
2359 if (res > upper_limit)
2360 res = upper_limit;
0fc1b451
AK		 2361
2362 if (res > MAX_LFS_FILESIZE)
2363 res = MAX_LFS_FILESIZE;
2364
ac27a0ec
DK		 2365 return res;
2366}
2367
617ba13b 2368static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2369 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2370{
617ba13b 2371 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2372 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2373 int has_super = 0;
2374
2375 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2376
617ba13b 2377 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2378 nr < first_meta_bg)
70bbb3e0 2379 return logical_sb_block + nr + 1;
ac27a0ec 2380 bg = sbi->s_desc_per_block * nr;
617ba13b 2381 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2382 has_super = 1;
0b8e58a1 2383
617ba13b 2384 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2385}
2386
c9de560d
AT		 2387/**
2388 * ext4_get_stripe_size: Get the stripe size.
2389 * @sbi: In memory super block info
2390 *
2391 * If we have specified it via mount option, then
2392 * use the mount option value. If the value specified at mount time is
2393 * greater than the blocks per group use the super block value.
2394 * If the super block value is greater than blocks per group return 0.
2395 * Allocator needs it be less than blocks per group.
2396 *
2397 */
2398static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2399{
2400 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2401 unsigned long stripe_width =
2402 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2403 int ret;
c9de560d
AT		 2404
2405 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2406 ret = sbi->s_stripe;
2407 else if (stripe_width <= sbi->s_blocks_per_group)
2408 ret = stripe_width;
2409 else if (stride <= sbi->s_blocks_per_group)
2410 ret = stride;
2411 else
2412 ret = 0;
c9de560d 2413
3eb08658
DE		 2414 /*
2415 * If the stripe width is 1, this makes no sense and
2416 * we set it to 0 to turn off stripe handling code.
2417 */
2418 if (ret <= 1)
2419 ret = 0;
c9de560d 2420
3eb08658 2421 return ret;
c9de560d 2422}
ac27a0ec 2423
3197ebdb
TT		 2424/* sysfs supprt */
2425
2426struct ext4_attr {
2427 struct attribute attr;
2428 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2429 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2430 const char *, size_t);
2431 int offset;
2432};
2433
2434static int parse_strtoul(const char *buf,
2435 unsigned long max, unsigned long *value)
2436{
2437 char *endp;
2438
e7d2860b
AGR		 2439 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2440 endp = skip_spaces(endp);
3197ebdb
TT		 2441 if (*endp || *value > max)
2442 return -EINVAL;
2443
2444 return 0;
2445}
2446
2447static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2448 struct ext4_sb_info *sbi,
2449 char *buf)
2450{
2451 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2452 (s64) EXT4_C2B(sbi,
2453 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2454}
2455
2456static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2457 struct ext4_sb_info *sbi, char *buf)
2458{
2459 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2460
f613dfcb
TT		 2461 if (!sb->s_bdev->bd_part)
2462 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2463 return snprintf(buf, PAGE_SIZE, "%lu\n",
2464 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2465 sbi->s_sectors_written_start) >> 1);
2466}
2467
2468static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2469 struct ext4_sb_info *sbi, char *buf)
2470{
2471 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2472
f613dfcb
TT		 2473 if (!sb->s_bdev->bd_part)
2474 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2475 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2476 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2477 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2478 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2479}
2480
2481static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2482 struct ext4_sb_info *sbi,
2483 const char *buf, size_t count)
2484{
2485 unsigned long t;
2486
2487 if (parse_strtoul(buf, 0x40000000, &t))
2488 return -EINVAL;
2489
5dbd571d 2490 if (t && !is_power_of_2(t))
3197ebdb
TT		 2491 return -EINVAL;
2492
2493 sbi->s_inode_readahead_blks = t;
2494 return count;
2495}
2496
2497static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2498 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2499{
2500 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2501
2502 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2503}
2504
2505static ssize_t sbi_ui_store(struct ext4_attr *a,
2506 struct ext4_sb_info *sbi,
2507 const char *buf, size_t count)
2508{
2509 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2510 unsigned long t;
2511
2512 if (parse_strtoul(buf, 0xffffffff, &t))
2513 return -EINVAL;
2514 *ui = t;
2515 return count;
2516}
2517
2c0544b2
TT		 2518static ssize_t trigger_test_error(struct ext4_attr *a,
2519 struct ext4_sb_info *sbi,
2520 const char *buf, size_t count)
2521{
2522 int len = count;
2523
2524 if (!capable(CAP_SYS_ADMIN))
2525 return -EPERM;
2526
2527 if (len && buf[len-1] == '\n')
2528 len--;
2529
2530 if (len)
2531 ext4_error(sbi->s_sb, "%.*s", len, buf);
2532 return count;
2533}
2534
3197ebdb
TT		 2535#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2536static struct ext4_attr ext4_attr_##_name = { \
2537 .attr = {.name = __stringify(_name), .mode = _mode }, \
2538 .show = _show, \
2539 .store = _store, \
2540 .offset = offsetof(struct ext4_sb_info, _elname), \
2541}
2542#define EXT4_ATTR(name, mode, show, store) \
2543static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2544
857ac889 2545#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2546#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2547#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2548#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2549 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2550#define ATTR_LIST(name) &ext4_attr_##name.attr
2551
2552EXT4_RO_ATTR(delayed_allocation_blocks);
2553EXT4_RO_ATTR(session_write_kbytes);
2554EXT4_RO_ATTR(lifetime_write_kbytes);
2555EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2556 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2557EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2558EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2559EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2560EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2561EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2562EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2563EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2564EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
67a5da56 2565EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2566EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2567
2568static struct attribute *ext4_attrs[] = {
2569 ATTR_LIST(delayed_allocation_blocks),
2570 ATTR_LIST(session_write_kbytes),
2571 ATTR_LIST(lifetime_write_kbytes),
2572 ATTR_LIST(inode_readahead_blks),
11013911 2573 ATTR_LIST(inode_goal),
3197ebdb
TT		 2574 ATTR_LIST(mb_stats),
2575 ATTR_LIST(mb_max_to_scan),
2576 ATTR_LIST(mb_min_to_scan),
2577 ATTR_LIST(mb_order2_req),
2578 ATTR_LIST(mb_stream_req),
2579 ATTR_LIST(mb_group_prealloc),
55138e0b 2580 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2581 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2582 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2583 NULL,
2584};
2585
857ac889
LC		 2586/* Features this copy of ext4 supports */
2587EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2588EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2589EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2590
2591static struct attribute *ext4_feat_attrs[] = {
2592 ATTR_LIST(lazy_itable_init),
27ee40df 2593 ATTR_LIST(batched_discard),
5e7bbef1 2594 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2595 NULL,
2596};
2597
3197ebdb
TT		 2598static ssize_t ext4_attr_show(struct kobject *kobj,
2599 struct attribute *attr, char *buf)
2600{
2601 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2602 s_kobj);
2603 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2604
2605 return a->show ? a->show(a, sbi, buf) : 0;
2606}
2607
2608static ssize_t ext4_attr_store(struct kobject *kobj,
2609 struct attribute *attr,
2610 const char *buf, size_t len)
2611{
2612 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2613 s_kobj);
2614 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2615
2616 return a->store ? a->store(a, sbi, buf, len) : 0;
2617}
2618
2619static void ext4_sb_release(struct kobject *kobj)
2620{
2621 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2622 s_kobj);
2623 complete(&sbi->s_kobj_unregister);
2624}
2625
52cf25d0 2626static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2627 .show = ext4_attr_show,
2628 .store = ext4_attr_store,
2629};
2630
2631static struct kobj_type ext4_ktype = {
2632 .default_attrs = ext4_attrs,
2633 .sysfs_ops = &ext4_attr_ops,
2634 .release = ext4_sb_release,
2635};
2636
857ac889
LC		 2637static void ext4_feat_release(struct kobject *kobj)
2638{
2639 complete(&ext4_feat->f_kobj_unregister);
2640}
2641
2642static struct kobj_type ext4_feat_ktype = {
2643 .default_attrs = ext4_feat_attrs,
2644 .sysfs_ops = &ext4_attr_ops,
2645 .release = ext4_feat_release,
2646};
2647
a13fb1a4
ES		 2648/*
2649 * Check whether this filesystem can be mounted based on
2650 * the features present and the RDONLY/RDWR mount requested.
2651 * Returns 1 if this filesystem can be mounted as requested,
2652 * 0 if it cannot be.
2653 */
2654static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2655{
2656 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2657 ext4_msg(sb, KERN_ERR,
2658 "Couldn't mount because of "
2659 "unsupported optional features (%x)",
2660 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2661 ~EXT4_FEATURE_INCOMPAT_SUPP));
2662 return 0;
2663 }
2664
2665 if (readonly)
2666 return 1;
2667
2668 /* Check that feature set is OK for a read-write mount */
2669 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2670 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2671 "unsupported optional features (%x)",
2672 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2673 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2674 return 0;
2675 }
2676 /*
2677 * Large file size enabled file system can only be mounted
2678 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2679 */
2680 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2681 if (sizeof(blkcnt_t) < sizeof(u64)) {
2682 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2683 "cannot be mounted RDWR without "
2684 "CONFIG_LBDAF");
2685 return 0;
2686 }
2687 }
bab08ab9
TT		 2688 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2689 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2690 ext4_msg(sb, KERN_ERR,
2691 "Can't support bigalloc feature without "
2692 "extents feature\n");
2693 return 0;
2694 }
7c319d32
AK		 2695
2696#ifndef CONFIG_QUOTA
2697 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2698 !readonly) {
2699 ext4_msg(sb, KERN_ERR,
2700 "Filesystem with quota feature cannot be mounted RDWR "
2701 "without CONFIG_QUOTA");
2702 return 0;
2703 }
2704#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2705 return 1;
2706}
2707
66e61a9e
TT		 2708/*
2709 * This function is called once a day if we have errors logged
2710 * on the file system
2711 */
2712static void print_daily_error_info(unsigned long arg)
2713{
2714 struct super_block *sb = (struct super_block *) arg;
2715 struct ext4_sb_info *sbi;
2716 struct ext4_super_block *es;
2717
2718 sbi = EXT4_SB(sb);
2719 es = sbi->s_es;
2720
2721 if (es->s_error_count)
2722 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2723 le32_to_cpu(es->s_error_count));
2724 if (es->s_first_error_time) {
2725 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2726 sb->s_id, le32_to_cpu(es->s_first_error_time),
2727 (int) sizeof(es->s_first_error_func),
2728 es->s_first_error_func,
2729 le32_to_cpu(es->s_first_error_line));
2730 if (es->s_first_error_ino)
2731 printk(": inode %u",
2732 le32_to_cpu(es->s_first_error_ino));
2733 if (es->s_first_error_block)
2734 printk(": block %llu", (unsigned long long)
2735 le64_to_cpu(es->s_first_error_block));
2736 printk("\n");
2737 }
2738 if (es->s_last_error_time) {
2739 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2740 sb->s_id, le32_to_cpu(es->s_last_error_time),
2741 (int) sizeof(es->s_last_error_func),
2742 es->s_last_error_func,
2743 le32_to_cpu(es->s_last_error_line));
2744 if (es->s_last_error_ino)
2745 printk(": inode %u",
2746 le32_to_cpu(es->s_last_error_ino));
2747 if (es->s_last_error_block)
2748 printk(": block %llu", (unsigned long long)
2749 le64_to_cpu(es->s_last_error_block));
2750 printk("\n");
2751 }
2752 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2753}
2754
bfff6873
LC		 2755/* Find next suitable group and run ext4_init_inode_table */
2756static int ext4_run_li_request(struct ext4_li_request *elr)
2757{
2758 struct ext4_group_desc *gdp = NULL;
2759 ext4_group_t group, ngroups;
2760 struct super_block *sb;
2761 unsigned long timeout = 0;
2762 int ret = 0;
2763
2764 sb = elr->lr_super;
2765 ngroups = EXT4_SB(sb)->s_groups_count;
2766
8e8ad8a5 2767 sb_start_write(sb);
bfff6873
LC		 2768 for (group = elr->lr_next_group; group < ngroups; group++) {
2769 gdp = ext4_get_group_desc(sb, group, NULL);
2770 if (!gdp) {
2771 ret = 1;
2772 break;
2773 }
2774
2775 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2776 break;
2777 }
2778
7f511862 2779 if (group >= ngroups)
bfff6873
LC		 2780 ret = 1;
2781
2782 if (!ret) {
2783 timeout = jiffies;
2784 ret = ext4_init_inode_table(sb, group,
2785 elr->lr_timeout ? 0 : 1);
2786 if (elr->lr_timeout == 0) {
51ce6511
LC		 2787 timeout = (jiffies - timeout) *
2788 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2789 elr->lr_timeout = timeout;
2790 }
2791 elr->lr_next_sched = jiffies + elr->lr_timeout;
2792 elr->lr_next_group = group + 1;
2793 }
8e8ad8a5 2794 sb_end_write(sb);
bfff6873
LC		 2795
2796 return ret;
2797}
2798
2799/*
2800 * Remove lr_request from the list_request and free the
4ed5c033 2801 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2802 */
2803static void ext4_remove_li_request(struct ext4_li_request *elr)
2804{
2805 struct ext4_sb_info *sbi;
2806
2807 if (!elr)
2808 return;
2809
2810 sbi = elr->lr_sbi;
2811
2812 list_del(&elr->lr_request);
2813 sbi->s_li_request = NULL;
2814 kfree(elr);
2815}
2816
2817static void ext4_unregister_li_request(struct super_block *sb)
2818{
1bb933fb
LC		 2819 mutex_lock(&ext4_li_mtx);
2820 if (!ext4_li_info) {
2821 mutex_unlock(&ext4_li_mtx);
bfff6873 2822 return;
1bb933fb 2823 }
bfff6873
LC		 2824
2825 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2826 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2827 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2828 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2829}
2830
8f1f7453
ES		 2831static struct task_struct *ext4_lazyinit_task;
2832
bfff6873
LC		 2833/*
2834 * This is the function where ext4lazyinit thread lives. It walks
2835 * through the request list searching for next scheduled filesystem.
2836 * When such a fs is found, run the lazy initialization request
2837 * (ext4_rn_li_request) and keep track of the time spend in this
2838 * function. Based on that time we compute next schedule time of
2839 * the request. When walking through the list is complete, compute
2840 * next waking time and put itself into sleep.
2841 */
2842static int ext4_lazyinit_thread(void *arg)
2843{
2844 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2845 struct list_head *pos, *n;
2846 struct ext4_li_request *elr;
4ed5c033 2847 unsigned long next_wakeup, cur;
bfff6873
LC		 2848
2849 BUG_ON(NULL == eli);
2850
bfff6873
LC		 2851cont_thread:
2852 while (true) {
2853 next_wakeup = MAX_JIFFY_OFFSET;
2854
2855 mutex_lock(&eli->li_list_mtx);
2856 if (list_empty(&eli->li_request_list)) {
2857 mutex_unlock(&eli->li_list_mtx);
2858 goto exit_thread;
2859 }
2860
2861 list_for_each_safe(pos, n, &eli->li_request_list) {
2862 elr = list_entry(pos, struct ext4_li_request,
2863 lr_request);
2864
b2c78cd0
TT		 2865 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2866 if (ext4_run_li_request(elr) != 0) {
2867 /* error, remove the lazy_init job */
2868 ext4_remove_li_request(elr);
2869 continue;
2870 }
bfff6873
LC		 2871 }
2872
2873 if (time_before(elr->lr_next_sched, next_wakeup))
2874 next_wakeup = elr->lr_next_sched;
2875 }
2876 mutex_unlock(&eli->li_list_mtx);
2877
a0acae0e 2878 try_to_freeze();
bfff6873 2879
4ed5c033
LC		 2880 cur = jiffies;
2881 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2882 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2883 cond_resched();
2884 continue;
2885 }
2886
4ed5c033
LC		 2887 schedule_timeout_interruptible(next_wakeup - cur);
2888
8f1f7453
ES		 2889 if (kthread_should_stop()) {
2890 ext4_clear_request_list();
2891 goto exit_thread;
2892 }
bfff6873
LC		 2893 }
2894
2895exit_thread:
2896 /*
2897 * It looks like the request list is empty, but we need
2898 * to check it under the li_list_mtx lock, to prevent any
2899 * additions into it, and of course we should lock ext4_li_mtx
2900 * to atomically free the list and ext4_li_info, because at
2901 * this point another ext4 filesystem could be registering
2902 * new one.
2903 */
2904 mutex_lock(&ext4_li_mtx);
2905 mutex_lock(&eli->li_list_mtx);
2906 if (!list_empty(&eli->li_request_list)) {
2907 mutex_unlock(&eli->li_list_mtx);
2908 mutex_unlock(&ext4_li_mtx);
2909 goto cont_thread;
2910 }
2911 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2912 kfree(ext4_li_info);
2913 ext4_li_info = NULL;
2914 mutex_unlock(&ext4_li_mtx);
2915
2916 return 0;
2917}
2918
2919static void ext4_clear_request_list(void)
2920{
2921 struct list_head *pos, *n;
2922 struct ext4_li_request *elr;
2923
2924 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2925 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2926 elr = list_entry(pos, struct ext4_li_request,
2927 lr_request);
2928 ext4_remove_li_request(elr);
2929 }
2930 mutex_unlock(&ext4_li_info->li_list_mtx);
2931}
2932
2933static int ext4_run_lazyinit_thread(void)
2934{
8f1f7453
ES		 2935 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2936 ext4_li_info, "ext4lazyinit");
2937 if (IS_ERR(ext4_lazyinit_task)) {
2938 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2939 ext4_clear_request_list();
bfff6873
LC		 2940 kfree(ext4_li_info);
2941 ext4_li_info = NULL;
92b97816 2942 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2943 "initialization thread\n",
2944 err);
2945 return err;
2946 }
2947 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2948 return 0;
2949}
2950
2951/*
2952 * Check whether it make sense to run itable init. thread or not.
2953 * If there is at least one uninitialized inode table, return
2954 * corresponding group number, else the loop goes through all
2955 * groups and return total number of groups.
2956 */
2957static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2958{
2959 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2960 struct ext4_group_desc *gdp = NULL;
2961
2962 for (group = 0; group < ngroups; group++) {
2963 gdp = ext4_get_group_desc(sb, group, NULL);
2964 if (!gdp)
2965 continue;
2966
2967 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2968 break;
2969 }
2970
2971 return group;
2972}
2973
2974static int ext4_li_info_new(void)
2975{
2976 struct ext4_lazy_init *eli = NULL;
2977
2978 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2979 if (!eli)
2980 return -ENOMEM;
2981
bfff6873
LC		 2982 INIT_LIST_HEAD(&eli->li_request_list);
2983 mutex_init(&eli->li_list_mtx);
2984
bfff6873
LC		 2985 eli->li_state |= EXT4_LAZYINIT_QUIT;
2986
2987 ext4_li_info = eli;
2988
2989 return 0;
2990}
2991
2992static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2993 ext4_group_t start)
2994{
2995 struct ext4_sb_info *sbi = EXT4_SB(sb);
2996 struct ext4_li_request *elr;
2997 unsigned long rnd;
2998
2999 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3000 if (!elr)
3001 return NULL;
3002
3003 elr->lr_super = sb;
3004 elr->lr_sbi = sbi;
3005 elr->lr_next_group = start;
3006
3007 /*
3008 * Randomize first schedule time of the request to
3009 * spread the inode table initialization requests
3010 * better.
3011 */
3012 get_random_bytes(&rnd, sizeof(rnd));
3013 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3014 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3015
3016 return elr;
3017}
3018
7f511862
TT		 3019int ext4_register_li_request(struct super_block *sb,
3020 ext4_group_t first_not_zeroed)
bfff6873
LC		 3021{
3022 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3023 struct ext4_li_request *elr = NULL;
bfff6873 3024 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3025 int ret = 0;
bfff6873 3026
7f511862 3027 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3028 if (sbi->s_li_request != NULL) {
3029 /*
3030 * Reset timeout so it can be computed again, because
3031 * s_li_wait_mult might have changed.
3032 */
3033 sbi->s_li_request->lr_timeout = 0;
7f511862 3034 goto out;
51ce6511 3035 }
bfff6873
LC		 3036
3037 if (first_not_zeroed == ngroups ||
3038 (sb->s_flags & MS_RDONLY) ||
55ff3840 3039 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3040 goto out;
bfff6873
LC		 3041
3042 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3043 if (!elr) {
3044 ret = -ENOMEM;
3045 goto out;
3046 }
bfff6873
LC		 3047
3048 if (NULL == ext4_li_info) {
3049 ret = ext4_li_info_new();
3050 if (ret)
3051 goto out;
3052 }
3053
3054 mutex_lock(&ext4_li_info->li_list_mtx);
3055 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3056 mutex_unlock(&ext4_li_info->li_list_mtx);
3057
3058 sbi->s_li_request = elr;
46e4690b
TM		 3059 /*
3060 * set elr to NULL here since it has been inserted to
3061 * the request_list and the removal and free of it is
3062 * handled by ext4_clear_request_list from now on.
3063 */
3064 elr = NULL;
bfff6873
LC		 3065
3066 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3067 ret = ext4_run_lazyinit_thread();
3068 if (ret)
3069 goto out;
3070 }
bfff6873 3071out:
beed5ecb
NK		 3072 mutex_unlock(&ext4_li_mtx);
3073 if (ret)
bfff6873 3074 kfree(elr);
bfff6873
LC		 3075 return ret;
3076}
3077
3078/*
3079 * We do not need to lock anything since this is called on
3080 * module unload.
3081 */
3082static void ext4_destroy_lazyinit_thread(void)
3083{
3084 /*
3085 * If thread exited earlier
3086 * there's nothing to be done.
3087 */
8f1f7453 3088 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3089 return;
3090
8f1f7453 3091 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3092}
3093
25ed6e8a
DW		 3094static int set_journal_csum_feature_set(struct super_block *sb)
3095{
3096 int ret = 1;
3097 int compat, incompat;
3098 struct ext4_sb_info *sbi = EXT4_SB(sb);
3099
3100 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3101 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3102 /* journal checksum v2 */
3103 compat = 0;
3104 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3105 } else {
3106 /* journal checksum v1 */
3107 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3108 incompat = 0;
3109 }
3110
3111 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3112 ret = jbd2_journal_set_features(sbi->s_journal,
3113 compat, 0,
3114 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3115 incompat);
3116 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3117 ret = jbd2_journal_set_features(sbi->s_journal,
3118 compat, 0,
3119 incompat);
3120 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3121 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3122 } else {
3123 jbd2_journal_clear_features(sbi->s_journal,
3124 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3125 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3126 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3127 }
3128
3129 return ret;
3130}
3131
952fc18e
TT		 3132/*
3133 * Note: calculating the overhead so we can be compatible with
3134 * historical BSD practice is quite difficult in the face of
3135 * clusters/bigalloc. This is because multiple metadata blocks from
3136 * different block group can end up in the same allocation cluster.
3137 * Calculating the exact overhead in the face of clustered allocation
3138 * requires either O(all block bitmaps) in memory or O(number of block
3139 * groups**2) in time. We will still calculate the superblock for
3140 * older file systems --- and if we come across with a bigalloc file
3141 * system with zero in s_overhead_clusters the estimate will be close to
3142 * correct especially for very large cluster sizes --- but for newer
3143 * file systems, it's better to calculate this figure once at mkfs
3144 * time, and store it in the superblock. If the superblock value is
3145 * present (even for non-bigalloc file systems), we will use it.
3146 */
3147static int count_overhead(struct super_block *sb, ext4_group_t grp,
3148 char *buf)
3149{
3150 struct ext4_sb_info *sbi = EXT4_SB(sb);
3151 struct ext4_group_desc *gdp;
3152 ext4_fsblk_t first_block, last_block, b;
3153 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3154 int s, j, count = 0;
3155
0548bbb8
TT		 3156 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3157 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3158 sbi->s_itb_per_group + 2);
3159
952fc18e
TT		 3160 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3161 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3162 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3163 for (i = 0; i < ngroups; i++) {
3164 gdp = ext4_get_group_desc(sb, i, NULL);
3165 b = ext4_block_bitmap(sb, gdp);
3166 if (b >= first_block && b <= last_block) {
3167 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3168 count++;
3169 }
3170 b = ext4_inode_bitmap(sb, gdp);
3171 if (b >= first_block && b <= last_block) {
3172 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3173 count++;
3174 }
3175 b = ext4_inode_table(sb, gdp);
3176 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3177 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3178 int c = EXT4_B2C(sbi, b - first_block);
3179 ext4_set_bit(c, buf);
3180 count++;
3181 }
3182 if (i != grp)
3183 continue;
3184 s = 0;
3185 if (ext4_bg_has_super(sb, grp)) {
3186 ext4_set_bit(s++, buf);
3187 count++;
3188 }
3189 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3190 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3191 count++;
3192 }
3193 }
3194 if (!count)
3195 return 0;
3196 return EXT4_CLUSTERS_PER_GROUP(sb) -
3197 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3198}
3199
3200/*
3201 * Compute the overhead and stash it in sbi->s_overhead
3202 */
3203int ext4_calculate_overhead(struct super_block *sb)
3204{
3205 struct ext4_sb_info *sbi = EXT4_SB(sb);
3206 struct ext4_super_block *es = sbi->s_es;
3207 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3208 ext4_fsblk_t overhead = 0;
3209 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3210
952fc18e
TT		 3211 if (!buf)
3212 return -ENOMEM;
3213
3214 /*
3215 * Compute the overhead (FS structures). This is constant
3216 * for a given filesystem unless the number of block groups
3217 * changes so we cache the previous value until it does.
3218 */
3219
3220 /*
3221 * All of the blocks before first_data_block are overhead
3222 */
3223 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3224
3225 /*
3226 * Add the overhead found in each block group
3227 */
3228 for (i = 0; i < ngroups; i++) {
3229 int blks;
3230
3231 blks = count_overhead(sb, i, buf);
3232 overhead += blks;
3233 if (blks)
3234 memset(buf, 0, PAGE_SIZE);
3235 cond_resched();
3236 }
0875a2b4
ES		 3237 /* Add the journal blocks as well */
3238 if (sbi->s_journal)
3239 overhead += EXT4_B2C(sbi, sbi->s_journal->j_maxlen);
3240
952fc18e
TT		 3241 sbi->s_overhead = overhead;
3242 smp_wmb();
3243 free_page((unsigned long) buf);
3244 return 0;
3245}
3246
2b2d6d01 3247static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3248{
d4c402d9 3249 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3250 struct buffer_head *bh;
617ba13b
MC		 3251 struct ext4_super_block *es = NULL;
3252 struct ext4_sb_info *sbi;
3253 ext4_fsblk_t block;
3254 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3255 ext4_fsblk_t logical_sb_block;
ac27a0ec 3256 unsigned long offset = 0;
ac27a0ec
DK		 3257 unsigned long journal_devnum = 0;
3258 unsigned long def_mount_opts;
3259 struct inode *root;
9f6200bb 3260 char *cp;
0390131b 3261 const char *descr;
dcc7dae3 3262 int ret = -ENOMEM;
281b5995 3263 int blocksize, clustersize;
4ec11028
TT		 3264 unsigned int db_count;
3265 unsigned int i;
281b5995 3266 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3267 __u64 blocks_count;
07aa2ea1 3268 int err = 0;
b3881f74 3269 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3270 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3271
3272 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3273 if (!sbi)
dcc7dae3 3274 goto out_free_orig;
705895b6
PE		 3275
3276 sbi->s_blockgroup_lock =
3277 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3278 if (!sbi->s_blockgroup_lock) {
3279 kfree(sbi);
dcc7dae3 3280 goto out_free_orig;
705895b6 3281 }
ac27a0ec 3282 sb->s_fs_info = sbi;
2c0544b2 3283 sbi->s_sb = sb;
240799cd 3284 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3285 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3286 if (sb->s_bdev->bd_part)
3287 sbi->s_sectors_written_start =
3288 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3289
9f6200bb
TT		 3290 /* Cleanup superblock name */
3291 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3292 *cp = '!';
3293
07aa2ea1 3294 /* -EINVAL is default */
dcc7dae3 3295 ret = -EINVAL;
617ba13b 3296 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3297 if (!blocksize) {
b31e1552 3298 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3299 goto out_fail;
3300 }
3301
3302 /*
617ba13b 3303 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3304 * block sizes. We need to calculate the offset from buffer start.
3305 */
617ba13b 3306 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3307 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3308 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3309 } else {
70bbb3e0 3310 logical_sb_block = sb_block;
ac27a0ec
DK		 3311 }
3312
70bbb3e0 3313 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3314 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3315 goto out_fail;
3316 }
3317 /*
3318 * Note: s_es must be initialized as soon as possible because
617ba13b 3319 * some ext4 macro-instructions depend on its value
ac27a0ec 3320 */
2716b802 3321 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3322 sbi->s_es = es;
3323 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3324 if (sb->s_magic != EXT4_SUPER_MAGIC)
3325 goto cantfind_ext4;
afc32f7e 3326 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3327
feb0ab32
DW		 3328 /* Warn if metadata_csum and gdt_csum are both set. */
3329 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3330 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3331 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3332 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3333 "redundant flags; please run fsck.");
3334
d25425f8
DW		 3335 /* Check for a known checksum algorithm */
3336 if (!ext4_verify_csum_type(sb, es)) {
3337 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3338 "unknown checksum algorithm.");
3339 silent = 1;
3340 goto cantfind_ext4;
3341 }
3342
0441984a
DW		 3343 /* Load the checksum driver */
3344 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3345 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3346 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3347 if (IS_ERR(sbi->s_chksum_driver)) {
3348 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3349 ret = PTR_ERR(sbi->s_chksum_driver);
3350 sbi->s_chksum_driver = NULL;
3351 goto failed_mount;
3352 }
3353 }
3354
a9c47317
DW		 3355 /* Check superblock checksum */
3356 if (!ext4_superblock_csum_verify(sb, es)) {
3357 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3358 "invalid superblock checksum. Run e2fsck?");
3359 silent = 1;
3360 goto cantfind_ext4;
3361 }
3362
3363 /* Precompute checksum seed for all metadata */
3364 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3365 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3366 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3367 sizeof(es->s_uuid));
3368
ac27a0ec
DK		 3369 /* Set defaults before we parse the mount options */
3370 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3371 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3372 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3373 set_opt(sb, DEBUG);
87f26807 3374 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3375 set_opt(sb, GRPID);
617ba13b 3376 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3377 set_opt(sb, NO_UID32);
ea663336 3378 /* xattr user namespace & acls are now defaulted on */
ea663336 3379 set_opt(sb, XATTR_USER);
03010a33 3380#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3381 set_opt(sb, POSIX_ACL);
2e7842b8 3382#endif
6fd7a467 3383 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3384 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3385 set_opt(sb, JOURNAL_DATA);
617ba13b 3386 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3387 set_opt(sb, ORDERED_DATA);
617ba13b 3388 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3389 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3390
3391 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3392 set_opt(sb, ERRORS_PANIC);
bb4f397a 3393 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3394 set_opt(sb, ERRORS_CONT);
bb4f397a 3395 else
fd8c37ec 3396 set_opt(sb, ERRORS_RO);
8b67f04a 3397 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3398 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3399 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3400 set_opt(sb, DISCARD);
ac27a0ec 3401
08cefc7a
EB		 3402 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3403 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3404 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3405 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3406 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3407
8b67f04a 3408 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3409 set_opt(sb, BARRIER);
ac27a0ec 3410
dd919b98
AK		 3411 /*
3412 * enable delayed allocation by default
3413 * Use -o nodelalloc to turn it off
3414 */
bc0b75f7 3415 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3416 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3417 set_opt(sb, DELALLOC);
dd919b98 3418
51ce6511
LC		 3419 /*
3420 * set default s_li_wait_mult for lazyinit, for the case there is
3421 * no mount option specified.
3422 */
3423 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3424
8b67f04a 3425 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3426 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3427 ext4_msg(sb, KERN_WARNING,
3428 "failed to parse options in superblock: %s",
3429 sbi->s_es->s_mount_opts);
3430 }
5a916be1 3431 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3432 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3433 &journal_ioprio, 0))
ac27a0ec
DK		 3434 goto failed_mount;
3435
56889787
TT		 3436 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3437 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3438 "with data=journal disables delayed "
3439 "allocation and O_DIRECT support!\n");
3440 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3441 ext4_msg(sb, KERN_ERR, "can't mount with "
3442 "both data=journal and delalloc");
3443 goto failed_mount;
3444 }
3445 if (test_opt(sb, DIOREAD_NOLOCK)) {
3446 ext4_msg(sb, KERN_ERR, "can't mount with "
3447 "both data=journal and delalloc");
3448 goto failed_mount;
3449 }
3450 if (test_opt(sb, DELALLOC))
3451 clear_opt(sb, DELALLOC);
3452 }
3453
ac27a0ec 3454 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3455 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3456
617ba13b
MC		 3457 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3458 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3459 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3460 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3461 ext4_msg(sb, KERN_WARNING,
3462 "feature flags set on rev 0 fs, "
3463 "running e2fsck is recommended");
469108ff 3464
2035e776
TT		 3465 if (IS_EXT2_SB(sb)) {
3466 if (ext2_feature_set_ok(sb))
3467 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3468 "using the ext4 subsystem");
3469 else {
3470 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3471 "to feature incompatibilities");
3472 goto failed_mount;
3473 }
3474 }
3475
3476 if (IS_EXT3_SB(sb)) {
3477 if (ext3_feature_set_ok(sb))
3478 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3479 "using the ext4 subsystem");
3480 else {
3481 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3482 "to feature incompatibilities");
3483 goto failed_mount;
3484 }
3485 }
3486
ac27a0ec
DK		 3487 /*
3488 * Check feature flags regardless of the revision level, since we
3489 * previously didn't change the revision level when setting the flags,
3490 * so there is a chance incompat flags are set on a rev 0 filesystem.
3491 */
a13fb1a4 3492 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3493 goto failed_mount;
a13fb1a4 3494
261cb20c 3495 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3496 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3497 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3498 ext4_msg(sb, KERN_ERR,
3499 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3500 goto failed_mount;
3501 }
3502
ac27a0ec 3503 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3504 /* Validate the filesystem blocksize */
3505 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3506 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3507 blocksize);
ac27a0ec
DK		 3508 goto failed_mount;
3509 }
3510
2b2d6d01 3511 brelse(bh);
70bbb3e0
AM		 3512 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3513 offset = do_div(logical_sb_block, blocksize);
3514 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3515 if (!bh) {
b31e1552
ES		 3516 ext4_msg(sb, KERN_ERR,
3517 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3518 goto failed_mount;
3519 }
2716b802 3520 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3521 sbi->s_es = es;
617ba13b 3522 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3523 ext4_msg(sb, KERN_ERR,
3524 "Magic mismatch, very weird!");
ac27a0ec
DK		 3525 goto failed_mount;
3526 }
3527 }
3528
a13fb1a4
ES		 3529 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3530 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3531 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3532 has_huge_files);
3533 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3534
617ba13b
MC		 3535 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3536 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3537 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3538 } else {
3539 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3540 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3541 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3542 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3543 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3544 ext4_msg(sb, KERN_ERR,
3545 "unsupported inode size: %d",
2b2d6d01 3546 sbi->s_inode_size);
ac27a0ec
DK		 3547 goto failed_mount;
3548 }
ef7f3835
KS		 3549 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3550 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3551 }
0b8e58a1 3552
0d1ee42f
AR		 3553 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3554 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3555 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3556 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3557 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3558 ext4_msg(sb, KERN_ERR,
3559 "unsupported descriptor size %lu",
0d1ee42f
AR		 3560 sbi->s_desc_size);
3561 goto failed_mount;
3562 }
3563 } else
3564 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3565
ac27a0ec 3566 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3567 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3568 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3569 goto cantfind_ext4;
0b8e58a1 3570
617ba13b 3571 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3572 if (sbi->s_inodes_per_block == 0)
617ba13b 3573 goto cantfind_ext4;
ac27a0ec
DK		 3574 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3575 sbi->s_inodes_per_block;
0d1ee42f 3576 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3577 sbi->s_sbh = bh;
3578 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3579 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3580 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3581
2b2d6d01 3582 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3583 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3584 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3585 i = le32_to_cpu(es->s_flags);
3586 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3587 sbi->s_hash_unsigned = 3;
3588 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3589#ifdef __CHAR_UNSIGNED__
3590 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3591 sbi->s_hash_unsigned = 3;
3592#else
3593 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3594#endif
f99b2589 3595 }
ac27a0ec 3596
281b5995
TT		 3597 /* Handle clustersize */
3598 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3599 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3600 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3601 if (has_bigalloc) {
3602 if (clustersize < blocksize) {
3603 ext4_msg(sb, KERN_ERR,
3604 "cluster size (%d) smaller than "
3605 "block size (%d)", clustersize, blocksize);
3606 goto failed_mount;
3607 }
3608 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3609 le32_to_cpu(es->s_log_block_size);
3610 sbi->s_clusters_per_group =
3611 le32_to_cpu(es->s_clusters_per_group);
3612 if (sbi->s_clusters_per_group > blocksize * 8) {
3613 ext4_msg(sb, KERN_ERR,
3614 "#clusters per group too big: %lu",
3615 sbi->s_clusters_per_group);
3616 goto failed_mount;
3617 }
3618 if (sbi->s_blocks_per_group !=
3619 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3620 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3621 "clusters per group (%lu) inconsistent",
3622 sbi->s_blocks_per_group,
3623 sbi->s_clusters_per_group);
3624 goto failed_mount;
3625 }
3626 } else {
3627 if (clustersize != blocksize) {
3628 ext4_warning(sb, "fragment/cluster size (%d) != "
3629 "block size (%d)", clustersize,
3630 blocksize);
3631 clustersize = blocksize;
3632 }
3633 if (sbi->s_blocks_per_group > blocksize * 8) {
3634 ext4_msg(sb, KERN_ERR,
3635 "#blocks per group too big: %lu",
3636 sbi->s_blocks_per_group);
3637 goto failed_mount;
3638 }
3639 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3640 sbi->s_cluster_bits = 0;
ac27a0ec 3641 }
281b5995
TT		 3642 sbi->s_cluster_ratio = clustersize / blocksize;
3643
ac27a0ec 3644 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3645 ext4_msg(sb, KERN_ERR,
3646 "#inodes per group too big: %lu",
2b2d6d01 3647 sbi->s_inodes_per_group);
ac27a0ec
DK		 3648 goto failed_mount;
3649 }
3650
bf43d84b
ES		 3651 /*
3652 * Test whether we have more sectors than will fit in sector_t,
3653 * and whether the max offset is addressable by the page cache.
3654 */
5a9ae68a 3655 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3656 ext4_blocks_count(es));
5a9ae68a 3657 if (err) {
b31e1552 3658 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3659 " too large to mount safely on this system");
ac27a0ec 3660 if (sizeof(sector_t) < 8)
90c699a9 3661 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3662 goto failed_mount;
3663 }
3664
617ba13b
MC		 3665 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3666 goto cantfind_ext4;
e7c95593 3667
0f2ddca6
FTN		 3668 /* check blocks count against device size */
3669 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3670 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3671 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3672 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3673 ext4_blocks_count(es), blocks_count);
3674 goto failed_mount;
3675 }
3676
0b8e58a1
AD		 3677 /*
3678 * It makes no sense for the first data block to be beyond the end
3679 * of the filesystem.
3680 */
3681 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3682 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3683 "block %u is beyond end of filesystem (%llu)",
3684 le32_to_cpu(es->s_first_data_block),
3685 ext4_blocks_count(es));
e7c95593
ES		 3686 goto failed_mount;
3687 }
bd81d8ee
LV		 3688 blocks_count = (ext4_blocks_count(es) -
3689 le32_to_cpu(es->s_first_data_block) +
3690 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3691 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3692 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3693 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3694 "(block count %llu, first data block %u, "
b31e1552 3695 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3696 ext4_blocks_count(es),
3697 le32_to_cpu(es->s_first_data_block),
3698 EXT4_BLOCKS_PER_GROUP(sb));
3699 goto failed_mount;
3700 }
bd81d8ee 3701 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3702 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3703 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3704 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3705 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3706 sbi->s_group_desc = ext4_kvmalloc(db_count *
3707 sizeof(struct buffer_head *),
3708 GFP_KERNEL);
ac27a0ec 3709 if (sbi->s_group_desc == NULL) {
b31e1552 3710 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3711 ret = -ENOMEM;
ac27a0ec
DK		 3712 goto failed_mount;
3713 }
3714
9f6200bb
TT		 3715 if (ext4_proc_root)
3716 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3717
66acdcf4
TT		 3718 if (sbi->s_proc)
3719 proc_create_data("options", S_IRUGO, sbi->s_proc,
3720 &ext4_seq_options_fops, sb);
3721
705895b6 3722 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3723
3724 for (i = 0; i < db_count; i++) {
70bbb3e0 3725 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3726 sbi->s_group_desc[i] = sb_bread(sb, block);
3727 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3728 ext4_msg(sb, KERN_ERR,
3729 "can't read group descriptor %d", i);
ac27a0ec
DK		 3730 db_count = i;
3731 goto failed_mount2;
3732 }
3733 }
bfff6873 3734 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3735 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3736 goto failed_mount2;
3737 }
772cb7c8
JS		 3738 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3739 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3740 ext4_msg(sb, KERN_ERR,
3741 "unable to initialize "
3742 "flex_bg meta info!");
772cb7c8
JS		 3743 goto failed_mount2;
3744 }
3745
ac27a0ec
DK		 3746 sbi->s_gdb_count = db_count;
3747 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3748 spin_lock_init(&sbi->s_next_gen_lock);
3749
04496411
TM		 3750 init_timer(&sbi->s_err_report);
3751 sbi->s_err_report.function = print_daily_error_info;
3752 sbi->s_err_report.data = (unsigned long) sb;
3753
57042651 3754 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3755 ext4_count_free_clusters(sb));
ce7e010a
TT		 3756 if (!err) {
3757 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3758 ext4_count_free_inodes(sb));
3759 }
3760 if (!err) {
3761 err = percpu_counter_init(&sbi->s_dirs_counter,
3762 ext4_count_dirs(sb));
3763 }
3764 if (!err) {
57042651 3765 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3766 }
3767 if (err) {
3768 ext4_msg(sb, KERN_ERR, "insufficient memory");
3769 goto failed_mount3;
3770 }
3771
c9de560d 3772 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3773 sbi->s_max_writeback_mb_bump = 128;
67a5da56 3774 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3775
ac27a0ec
DK		 3776 /*
3777 * set up enough so that it can read an inode
3778 */
9ca92389
TT		 3779 if (!test_opt(sb, NOLOAD) &&
3780 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3781 sb->s_op = &ext4_sops;
3782 else
3783 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3784 sb->s_export_op = &ext4_export_ops;
3785 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3786#ifdef CONFIG_QUOTA
617ba13b
MC		 3787 sb->s_qcop = &ext4_qctl_operations;
3788 sb->dq_op = &ext4_quota_operations;
7c319d32
AK		 3789
3790 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
3791 /* Use qctl operations for hidden quota files. */
3792 sb->s_qcop = &ext4_qctl_sysfile_operations;
3793 }
ac27a0ec 3794#endif
f2fa2ffc
AK		 3795 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3796
ac27a0ec 3797 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3798 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3799
3800 sb->s_root = NULL;
3801
3802 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3803 EXT4_HAS_INCOMPAT_FEATURE(sb,
3804 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3805
c5e06d10
JL		 3806 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3807 !(sb->s_flags & MS_RDONLY))
3808 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3809 goto failed_mount3;
3810
ac27a0ec
DK		 3811 /*
3812 * The first inode we look at is the journal inode. Don't try
3813 * root first: it may be modified in the journal!
3814 */
3815 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3816 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3817 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3818 goto failed_mount3;
0390131b
FM		 3819 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3820 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3821 ext4_msg(sb, KERN_ERR, "required journal recovery "
3822 "suppressed and not mounted read-only");
744692dc 3823 goto failed_mount_wq;
ac27a0ec 3824 } else {
fd8c37ec 3825 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3826 sbi->s_journal = NULL;
3827 needs_recovery = 0;
3828 goto no_journal;
ac27a0ec
DK		 3829 }
3830
f32aaf2d 3831 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3832 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3833 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3834 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3835 goto failed_mount_wq;
eb40a09c
JS		 3836 }
3837
25ed6e8a
DW		 3838 if (!set_journal_csum_feature_set(sb)) {
3839 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3840 "feature set");
3841 goto failed_mount_wq;
d4da6c9c 3842 }
818d276c 3843
ac27a0ec
DK		 3844 /* We have now updated the journal if required, so we can
3845 * validate the data journaling mode. */
3846 switch (test_opt(sb, DATA_FLAGS)) {
3847 case 0:
3848 /* No mode set, assume a default based on the journal
63f57933
AM		 3849 * capabilities: ORDERED_DATA if the journal can
3850 * cope, else JOURNAL_DATA
3851 */
dab291af
MC		 3852 if (jbd2_journal_check_available_features
3853 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3854 set_opt(sb, ORDERED_DATA);
ac27a0ec 3855 else
fd8c37ec 3856 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3857 break;
3858
617ba13b
MC		 3859 case EXT4_MOUNT_ORDERED_DATA:
3860 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3861 if (!jbd2_journal_check_available_features
3862 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3863 ext4_msg(sb, KERN_ERR, "Journal does not support "
3864 "requested data journaling mode");
744692dc 3865 goto failed_mount_wq;
ac27a0ec
DK		 3866 }
3867 default:
3868 break;
3869 }
b3881f74 3870 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3871
18aadd47
BJ		 3872 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3873
ce7e010a
TT		 3874 /*
3875 * The journal may have updated the bg summary counts, so we
3876 * need to update the global counters.
3877 */
57042651 3878 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3879 ext4_count_free_clusters(sb));
ce7e010a
TT		 3880 percpu_counter_set(&sbi->s_freeinodes_counter,
3881 ext4_count_free_inodes(sb));
3882 percpu_counter_set(&sbi->s_dirs_counter,
3883 ext4_count_dirs(sb));
57042651 3884 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3885
ce7e010a 3886no_journal:
952fc18e
TT		 3887 /*
3888 * Get the # of file system overhead blocks from the
3889 * superblock if present.
3890 */
3891 if (es->s_overhead_clusters)
3892 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3893 else {
07aa2ea1
LC		 3894 err = ext4_calculate_overhead(sb);
3895 if (err)
952fc18e
TT		 3896 goto failed_mount_wq;
3897 }
3898
fd89d5f2
TH		 3899 /*
3900 * The maximum number of concurrent works can be high and
3901 * concurrency isn't really necessary. Limit it to 1.
3902 */
3903 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3904 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3905 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3906 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
07aa2ea1 3907 ret = -ENOMEM;
4c0425ff
MC		 3908 goto failed_mount_wq;
3909 }
3910
ac27a0ec 3911 /*
dab291af 3912 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3913 * so we can safely mount the rest of the filesystem now.
3914 */
3915
1d1fe1ee
DH		 3916 root = ext4_iget(sb, EXT4_ROOT_INO);
3917 if (IS_ERR(root)) {
b31e1552 3918 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3919 ret = PTR_ERR(root);
32a9bb57 3920 root = NULL;
ac27a0ec
DK		 3921 goto failed_mount4;
3922 }
3923 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3924 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3925 iput(root);
ac27a0ec
DK		 3926 goto failed_mount4;
3927 }
48fde701 3928 sb->s_root = d_make_root(root);
1d1fe1ee 3929 if (!sb->s_root) {
b31e1552 3930 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3931 ret = -ENOMEM;
3932 goto failed_mount4;
3933 }
ac27a0ec 3934
7e84b621
ES		 3935 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3936 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3937
3938 /* determine the minimum size of new large inodes, if present */
3939 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3940 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3941 EXT4_GOOD_OLD_INODE_SIZE;
3942 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3943 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3944 if (sbi->s_want_extra_isize <
3945 le16_to_cpu(es->s_want_extra_isize))
3946 sbi->s_want_extra_isize =
3947 le16_to_cpu(es->s_want_extra_isize);
3948 if (sbi->s_want_extra_isize <
3949 le16_to_cpu(es->s_min_extra_isize))
3950 sbi->s_want_extra_isize =
3951 le16_to_cpu(es->s_min_extra_isize);
3952 }
3953 }
3954 /* Check if enough inode space is available */
3955 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3956 sbi->s_inode_size) {
3957 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3958 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3959 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3960 "available");
ef7f3835
KS		 3961 }
3962
6fd058f7
TT		 3963 err = ext4_setup_system_zone(sb);
3964 if (err) {
b31e1552 3965 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3966 "zone (%d)", err);
94bf608a 3967 goto failed_mount4a;
6fd058f7
TT		 3968 }
3969
c2774d84 3970 ext4_ext_init(sb);
9d99012f 3971 err = ext4_mb_init(sb);
c2774d84 3972 if (err) {
421f91d2 3973 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3974 err);
dcf2d804 3975 goto failed_mount5;
c2774d84
AK		 3976 }
3977
bfff6873
LC		 3978 err = ext4_register_li_request(sb, first_not_zeroed);
3979 if (err)
dcf2d804 3980 goto failed_mount6;
bfff6873 3981
3197ebdb
TT		 3982 sbi->s_kobj.kset = ext4_kset;
3983 init_completion(&sbi->s_kobj_unregister);
3984 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3985 "%s", sb->s_id);
dcf2d804
TM		 3986 if (err)
3987 goto failed_mount7;
3197ebdb 3988
617ba13b
MC		 3989 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3990 ext4_orphan_cleanup(sb, es);
3991 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3992 if (needs_recovery) {
b31e1552 3993 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3994 ext4_mark_recovery_complete(sb, es);
3995 }
3996 if (EXT4_SB(sb)->s_journal) {
3997 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3998 descr = " journalled data mode";
3999 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4000 descr = " ordered data mode";
4001 else
4002 descr = " writeback data mode";
4003 } else
4004 descr = "out journal";
4005
7c319d32
AK		 4006#ifdef CONFIG_QUOTA
4007 /* Enable quota usage during mount. */
4008 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4009 !(sb->s_flags & MS_RDONLY)) {
07aa2ea1
LC		 4010 err = ext4_enable_quotas(sb);
4011 if (err)
7c319d32
AK		 4012 goto failed_mount7;
4013 }
4014#endif /* CONFIG_QUOTA */
4015
79add3a3
LC		 4016 if (test_opt(sb, DISCARD)) {
4017 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4018 if (!blk_queue_discard(q))
4019 ext4_msg(sb, KERN_WARNING,
4020 "mounting with \"discard\" option, but "
4021 "the device does not support discard");
4022 }
4023
d4c402d9 4024 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4025 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4026 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4027
66e61a9e
TT		 4028 if (es->s_error_count)
4029 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4030
d4c402d9 4031 kfree(orig_data);
ac27a0ec
DK		 4032 return 0;
4033
617ba13b 4034cantfind_ext4:
ac27a0ec 4035 if (!silent)
b31e1552 4036 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4037 goto failed_mount;
4038
dcf2d804
TM		 4039failed_mount7:
4040 ext4_unregister_li_request(sb);
4041failed_mount6:
dcf2d804 4042 ext4_mb_release(sb);
94bf608a
AV		 4043failed_mount5:
4044 ext4_ext_release(sb);
dcf2d804 4045 ext4_release_system_zone(sb);
94bf608a
AV		 4046failed_mount4a:
4047 dput(sb->s_root);
32a9bb57 4048 sb->s_root = NULL;
94bf608a 4049failed_mount4:
b31e1552 4050 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4051 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4052failed_mount_wq:
0390131b
FM		 4053 if (sbi->s_journal) {
4054 jbd2_journal_destroy(sbi->s_journal);
4055 sbi->s_journal = NULL;
4056 }
ac27a0ec 4057failed_mount3:
04496411 4058 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4059 if (sbi->s_flex_groups)
4060 ext4_kvfree(sbi->s_flex_groups);
57042651 4061 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4062 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4063 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4064 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 4065 if (sbi->s_mmp_tsk)
4066 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4067failed_mount2:
4068 for (i = 0; i < db_count; i++)
4069 brelse(sbi->s_group_desc[i]);
f18a5f21 4070 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4071failed_mount:
0441984a
DW		 4072 if (sbi->s_chksum_driver)
4073 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4074 if (sbi->s_proc) {
66acdcf4 4075 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4076 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4077 }
ac27a0ec
DK		 4078#ifdef CONFIG_QUOTA
4079 for (i = 0; i < MAXQUOTAS; i++)
4080 kfree(sbi->s_qf_names[i]);
4081#endif
617ba13b 4082 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4083 brelse(bh);
4084out_fail:
4085 sb->s_fs_info = NULL;
f6830165 4086 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4087 kfree(sbi);
dcc7dae3 4088out_free_orig:
d4c402d9 4089 kfree(orig_data);
07aa2ea1 4090 return err ? err : ret;
ac27a0ec
DK		 4091}
4092
4093/*
4094 * Setup any per-fs journal parameters now. We'll do this both on
4095 * initial mount, once the journal has been initialised but before we've
4096 * done any recovery; and again on any subsequent remount.
4097 */
617ba13b 4098static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4099{
617ba13b 4100 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4101
30773840
TT		 4102 journal->j_commit_interval = sbi->s_commit_interval;
4103 journal->j_min_batch_time = sbi->s_min_batch_time;
4104 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4105
a931da6a 4106 write_lock(&journal->j_state_lock);
ac27a0ec 4107 if (test_opt(sb, BARRIER))
dab291af 4108 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4109 else
dab291af 4110 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4111 if (test_opt(sb, DATA_ERR_ABORT))
4112 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4113 else
4114 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4115 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4116}
4117
617ba13b 4118static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4119 unsigned int journal_inum)
4120{
4121 struct inode *journal_inode;
4122 journal_t *journal;
4123
0390131b
FM		 4124 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4125
ac27a0ec
DK		 4126 /* First, test for the existence of a valid inode on disk. Bad
4127 * things happen if we iget() an unused inode, as the subsequent
4128 * iput() will try to delete it. */
4129
1d1fe1ee
DH		 4130 journal_inode = ext4_iget(sb, journal_inum);
4131 if (IS_ERR(journal_inode)) {
b31e1552 4132 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4133 return NULL;
4134 }
4135 if (!journal_inode->i_nlink) {
4136 make_bad_inode(journal_inode);
4137 iput(journal_inode);
b31e1552 4138 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4139 return NULL;
4140 }
4141
e5f8eab8 4142 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4143 journal_inode, journal_inode->i_size);
1d1fe1ee 4144 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4145 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4146 iput(journal_inode);
4147 return NULL;
4148 }
4149
dab291af 4150 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4151 if (!journal) {
b31e1552 4152 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4153 iput(journal_inode);
4154 return NULL;
4155 }
4156 journal->j_private = sb;
617ba13b 4157 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4158 return journal;
4159}
4160
617ba13b 4161static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4162 dev_t j_dev)
4163{
2b2d6d01 4164 struct buffer_head *bh;
ac27a0ec 4165 journal_t *journal;
617ba13b
MC		 4166 ext4_fsblk_t start;
4167 ext4_fsblk_t len;
ac27a0ec 4168 int hblock, blocksize;
617ba13b 4169 ext4_fsblk_t sb_block;
ac27a0ec 4170 unsigned long offset;
2b2d6d01 4171 struct ext4_super_block *es;
ac27a0ec
DK		 4172 struct block_device *bdev;
4173
0390131b
FM		 4174 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4175
b31e1552 4176 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4177 if (bdev == NULL)
4178 return NULL;
4179
ac27a0ec 4180 blocksize = sb->s_blocksize;
e1defc4f 4181 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4182 if (blocksize < hblock) {
b31e1552
ES		 4183 ext4_msg(sb, KERN_ERR,
4184 "blocksize too small for journal device");
ac27a0ec
DK		 4185 goto out_bdev;
4186 }
4187
617ba13b
MC		 4188 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4189 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4190 set_blocksize(bdev, blocksize);
4191 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4192 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4193 "external journal");
ac27a0ec
DK		 4194 goto out_bdev;
4195 }
4196
2716b802 4197 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4198 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4199 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4200 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4201 ext4_msg(sb, KERN_ERR, "external journal has "
4202 "bad superblock");
ac27a0ec
DK		 4203 brelse(bh);
4204 goto out_bdev;
4205 }
4206
617ba13b 4207 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4208 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4209 brelse(bh);
4210 goto out_bdev;
4211 }
4212
bd81d8ee 4213 len = ext4_blocks_count(es);
ac27a0ec
DK		 4214 start = sb_block + 1;
4215 brelse(bh); /* we're done with the superblock */
4216
dab291af 4217 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4218 start, len, blocksize);
4219 if (!journal) {
b31e1552 4220 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4221 goto out_bdev;
4222 }
4223 journal->j_private = sb;
4224 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4225 wait_on_buffer(journal->j_sb_buffer);
4226 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4227 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4228 goto out_journal;
4229 }
4230 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4231 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4232 "user (unsupported) - %d",
ac27a0ec
DK		 4233 be32_to_cpu(journal->j_superblock->s_nr_users));
4234 goto out_journal;
4235 }
617ba13b
MC		 4236 EXT4_SB(sb)->journal_bdev = bdev;
4237 ext4_init_journal_params(sb, journal);
ac27a0ec 4238 return journal;
0b8e58a1 4239
ac27a0ec 4240out_journal:
dab291af 4241 jbd2_journal_destroy(journal);
ac27a0ec 4242out_bdev:
617ba13b 4243 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4244 return NULL;
4245}
4246
617ba13b
MC		 4247static int ext4_load_journal(struct super_block *sb,
4248 struct ext4_super_block *es,
ac27a0ec
DK		 4249 unsigned long journal_devnum)
4250{
4251 journal_t *journal;
4252 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4253 dev_t journal_dev;
4254 int err = 0;
4255 int really_read_only;
4256
0390131b
FM		 4257 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4258
ac27a0ec
DK		 4259 if (journal_devnum &&
4260 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4261 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4262 "numbers have changed");
ac27a0ec
DK		 4263 journal_dev = new_decode_dev(journal_devnum);
4264 } else
4265 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4266
4267 really_read_only = bdev_read_only(sb->s_bdev);
4268
4269 /*
4270 * Are we loading a blank journal or performing recovery after a
4271 * crash? For recovery, we need to check in advance whether we
4272 * can get read-write access to the device.
4273 */
617ba13b 4274 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4275 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4276 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4277 "required on readonly filesystem");
ac27a0ec 4278 if (really_read_only) {
b31e1552
ES		 4279 ext4_msg(sb, KERN_ERR, "write access "
4280 "unavailable, cannot proceed");
ac27a0ec
DK		 4281 return -EROFS;
4282 }
b31e1552
ES		 4283 ext4_msg(sb, KERN_INFO, "write access will "
4284 "be enabled during recovery");
ac27a0ec
DK		 4285 }
4286 }
4287
4288 if (journal_inum && journal_dev) {
b31e1552
ES		 4289 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4290 "and inode journals!");
ac27a0ec
DK		 4291 return -EINVAL;
4292 }
4293
4294 if (journal_inum) {
617ba13b 4295 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4296 return -EINVAL;
4297 } else {
617ba13b 4298 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4299 return -EINVAL;
4300 }
4301
90576c0b 4302 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4303 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4304
617ba13b 4305 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4306 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4307 if (!err) {
4308 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4309 if (save)
4310 memcpy(save, ((char *) es) +
4311 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4312 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4313 if (save)
4314 memcpy(((char *) es) + EXT4_S_ERR_START,
4315 save, EXT4_S_ERR_LEN);
4316 kfree(save);
4317 }
ac27a0ec
DK		 4318
4319 if (err) {
b31e1552 4320 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4321 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4322 return err;
4323 }
4324
617ba13b
MC		 4325 EXT4_SB(sb)->s_journal = journal;
4326 ext4_clear_journal_err(sb, es);
ac27a0ec 4327
c41303ce 4328 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4329 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4330 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4331
4332 /* Make sure we flush the recovery flag to disk. */
e2d67052 4333 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4334 }
4335
4336 return 0;
4337}
4338
e2d67052 4339static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4340{
e2d67052 4341 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4342 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4343 int error = 0;
ac27a0ec 4344
7c2e7087 4345 if (!sbh || block_device_ejected(sb))
c4be0c1d 4346 return error;
914258bf
TT		 4347 if (buffer_write_io_error(sbh)) {
4348 /*
4349 * Oh, dear. A previous attempt to write the
4350 * superblock failed. This could happen because the
4351 * USB device was yanked out. Or it could happen to
4352 * be a transient write error and maybe the block will
4353 * be remapped. Nothing we can do but to retry the
4354 * write and hope for the best.
4355 */
b31e1552
ES		 4356 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4357 "superblock detected");
914258bf
TT		 4358 clear_buffer_write_io_error(sbh);
4359 set_buffer_uptodate(sbh);
4360 }
71290b36
TT		 4361 /*
4362 * If the file system is mounted read-only, don't update the
4363 * superblock write time. This avoids updating the superblock
4364 * write time when we are mounting the root file system
4365 * read/only but we need to replay the journal; at that point,
4366 * for people who are east of GMT and who make their clock
4367 * tick in localtime for Windows bug-for-bug compatibility,
4368 * the clock is set in the future, and this will cause e2fsck
4369 * to complain and force a full file system check.
4370 */
4371 if (!(sb->s_flags & MS_RDONLY))
4372 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4373 if (sb->s_bdev->bd_part)
4374 es->s_kbytes_written =
4375 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4376 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4377 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4378 else
4379 es->s_kbytes_written =
4380 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4381 ext4_free_blocks_count_set(es,
4382 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4383 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4384 es->s_free_inodes_count =
4385 cpu_to_le32(percpu_counter_sum_positive(
4386 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4387 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4388 ext4_superblock_csum_set(sb);
ac27a0ec 4389 mark_buffer_dirty(sbh);
914258bf 4390 if (sync) {
c4be0c1d
TS		 4391 error = sync_dirty_buffer(sbh);
4392 if (error)
4393 return error;
4394
4395 error = buffer_write_io_error(sbh);
4396 if (error) {
b31e1552
ES		 4397 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4398 "superblock");
914258bf
TT		 4399 clear_buffer_write_io_error(sbh);
4400 set_buffer_uptodate(sbh);
4401 }
4402 }
c4be0c1d 4403 return error;
ac27a0ec
DK		 4404}
4405
ac27a0ec
DK		 4406/*
4407 * Have we just finished recovery? If so, and if we are mounting (or
4408 * remounting) the filesystem readonly, then we will end up with a
4409 * consistent fs on disk. Record that fact.
4410 */
2b2d6d01
TT		 4411static void ext4_mark_recovery_complete(struct super_block *sb,
4412 struct ext4_super_block *es)
ac27a0ec 4413{
617ba13b 4414 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4415
0390131b
FM		 4416 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4417 BUG_ON(journal != NULL);
4418 return;
4419 }
dab291af 4420 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4421 if (jbd2_journal_flush(journal) < 0)
4422 goto out;
4423
617ba13b 4424 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4425 sb->s_flags & MS_RDONLY) {
617ba13b 4426 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4427 ext4_commit_super(sb, 1);
ac27a0ec 4428 }
7ffe1ea8
HK		 4429
4430out:
dab291af 4431 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4432}
4433
4434/*
4435 * If we are mounting (or read-write remounting) a filesystem whose journal
4436 * has recorded an error from a previous lifetime, move that error to the
4437 * main filesystem now.
4438 */
2b2d6d01
TT		 4439static void ext4_clear_journal_err(struct super_block *sb,
4440 struct ext4_super_block *es)
ac27a0ec
DK		 4441{
4442 journal_t *journal;
4443 int j_errno;
4444 const char *errstr;
4445
0390131b
FM		 4446 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4447
617ba13b 4448 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4449
4450 /*
4451 * Now check for any error status which may have been recorded in the
617ba13b 4452 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4453 */
4454
dab291af 4455 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4456 if (j_errno) {
4457 char nbuf[16];
4458
617ba13b 4459 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4460 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4461 "from previous mount: %s", errstr);
12062ddd 4462 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4463
617ba13b
MC		 4464 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4465 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4466 ext4_commit_super(sb, 1);
ac27a0ec 4467
dab291af 4468 jbd2_journal_clear_err(journal);
d796c52e 4469 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4470 }
4471}
4472
4473/*
4474 * Force the running and committing transactions to commit,
4475 * and wait on the commit.
4476 */
617ba13b 4477int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4478{
4479 journal_t *journal;
0390131b 4480 int ret = 0;
ac27a0ec
DK		 4481
4482 if (sb->s_flags & MS_RDONLY)
4483 return 0;
4484
617ba13b 4485 journal = EXT4_SB(sb)->s_journal;
8e8ad8a5 4486 if (journal)
0390131b 4487 ret = ext4_journal_force_commit(journal);
0390131b 4488
ac27a0ec
DK		 4489 return ret;
4490}
4491
617ba13b 4492static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4493{
14ce0cb4 4494 int ret = 0;
9eddacf9 4495 tid_t target;
8d5d02e6 4496 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4497
9bffad1e 4498 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4499 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4500 /*
4501 * Writeback quota in non-journalled quota case - journalled quota has
4502 * no dirty dquots
4503 */
4504 dquot_writeback_dquots(sb, -1);
8d5d02e6 4505 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4506 if (wait)
8d5d02e6 4507 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4508 }
14ce0cb4 4509 return ret;
ac27a0ec
DK		 4510}
4511
4512/*
4513 * LVM calls this function before a (read-only) snapshot is created. This
4514 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4515 *
4516 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4517 * state independently. It relies on upper layer to stop all data & metadata
4518 * modifications.
ac27a0ec 4519 */
c4be0c1d 4520static int ext4_freeze(struct super_block *sb)
ac27a0ec 4521{
c4be0c1d
TS		 4522 int error = 0;
4523 journal_t *journal;
ac27a0ec 4524
9ca92389
TT		 4525 if (sb->s_flags & MS_RDONLY)
4526 return 0;
ac27a0ec 4527
9ca92389 4528 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4529
9ca92389
TT		 4530 /* Now we set up the journal barrier. */
4531 jbd2_journal_lock_updates(journal);
ac27a0ec 4532
9ca92389
TT		 4533 /*
4534 * Don't clear the needs_recovery flag if we failed to flush
4535 * the journal.
4536 */
4537 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4538 if (error < 0)
4539 goto out;
9ca92389
TT		 4540
4541 /* Journal blocked and flushed, clear needs_recovery flag. */
4542 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4543 error = ext4_commit_super(sb, 1);
6b0310fb 4544out:
8e8ad8a5 4545 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4546 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4547 return error;
ac27a0ec
DK		 4548}
4549
4550/*
4551 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4552 * flag here, even though the filesystem is not technically dirty yet.
4553 */
c4be0c1d 4554static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4555{
9ca92389
TT		 4556 if (sb->s_flags & MS_RDONLY)
4557 return 0;
4558
9ca92389
TT		 4559 /* Reset the needs_recovery flag before the fs is unlocked. */
4560 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4561 ext4_commit_super(sb, 1);
c4be0c1d 4562 return 0;
ac27a0ec
DK		 4563}
4564
673c6100
TT		 4565/*
4566 * Structure to save mount options for ext4_remount's benefit
4567 */
4568struct ext4_mount_options {
4569 unsigned long s_mount_opt;
a2595b8a 4570 unsigned long s_mount_opt2;
08cefc7a
EB		 4571 kuid_t s_resuid;
4572 kgid_t s_resgid;
673c6100
TT		 4573 unsigned long s_commit_interval;
4574 u32 s_min_batch_time, s_max_batch_time;
4575#ifdef CONFIG_QUOTA
4576 int s_jquota_fmt;
4577 char *s_qf_names[MAXQUOTAS];
4578#endif
4579};
4580
2b2d6d01 4581static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4582{
2b2d6d01 4583 struct ext4_super_block *es;
617ba13b 4584 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4585 unsigned long old_sb_flags;
617ba13b 4586 struct ext4_mount_options old_opts;
c79d967d 4587 int enable_quota = 0;
8a266467 4588 ext4_group_t g;
b3881f74 4589 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4590 int err = 0;
ac27a0ec
DK		 4591#ifdef CONFIG_QUOTA
4592 int i;
4593#endif
d4c402d9 4594 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4595
4596 /* Store the original options */
4597 old_sb_flags = sb->s_flags;
4598 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4599 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4600 old_opts.s_resuid = sbi->s_resuid;
4601 old_opts.s_resgid = sbi->s_resgid;
4602 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4603 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4604 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4605#ifdef CONFIG_QUOTA
4606 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4607 for (i = 0; i < MAXQUOTAS; i++)
4608 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4609#endif
b3881f74
TT		 4610 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4611 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4612
4613 /*
4614 * Allow the "check" option to be passed as a remount option.
4615 */
661aa520 4616 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4617 err = -EINVAL;
4618 goto restore_opts;
4619 }
4620
4ab2f15b 4621 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4622 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4623
4624 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4625 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4626
4627 es = sbi->s_es;
4628
b3881f74 4629 if (sbi->s_journal) {
0390131b 4630 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4631 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4632 }
ac27a0ec 4633
661aa520 4634 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4635 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4636 err = -EROFS;
4637 goto restore_opts;
4638 }
4639
4640 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4641 err = dquot_suspend(sb, -1);
4642 if (err < 0)
c79d967d 4643 goto restore_opts;
c79d967d 4644
ac27a0ec
DK		 4645 /*
4646 * First of all, the unconditional stuff we have to do
4647 * to disable replay of the journal when we next remount
4648 */
4649 sb->s_flags |= MS_RDONLY;
4650
4651 /*
4652 * OK, test if we are remounting a valid rw partition
4653 * readonly, and if so set the rdonly flag and then
4654 * mark the partition as valid again.
4655 */
617ba13b
MC		 4656 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4657 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4658 es->s_state = cpu_to_le16(sbi->s_mount_state);
4659
a63c9eb2 4660 if (sbi->s_journal)
0390131b 4661 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4662 } else {
a13fb1a4
ES		 4663 /* Make sure we can mount this feature set readwrite */
4664 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4665 err = -EROFS;
4666 goto restore_opts;
4667 }
8a266467
TT		 4668 /*
4669 * Make sure the group descriptor checksums
0b8e58a1 4670 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4671 */
4672 for (g = 0; g < sbi->s_groups_count; g++) {
4673 struct ext4_group_desc *gdp =
4674 ext4_get_group_desc(sb, g, NULL);
4675
feb0ab32 4676 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4677 ext4_msg(sb, KERN_ERR,
4678 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4679 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4680 le16_to_cpu(gdp->bg_checksum));
4681 err = -EINVAL;
4682 goto restore_opts;
4683 }
4684 }
4685
ead6596b
ES		 4686 /*
4687 * If we have an unprocessed orphan list hanging
4688 * around from a previously readonly bdev mount,
4689 * require a full umount/remount for now.
4690 */
4691 if (es->s_last_orphan) {
b31e1552 4692 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4693 "remount RDWR because of unprocessed "
4694 "orphan inode list. Please "
b31e1552 4695 "umount/remount instead");
ead6596b
ES		 4696 err = -EINVAL;
4697 goto restore_opts;
4698 }
4699
ac27a0ec
DK		 4700 /*
4701 * Mounting a RDONLY partition read-write, so reread
4702 * and store the current valid flag. (It may have
4703 * been changed by e2fsck since we originally mounted
4704 * the partition.)
4705 */
0390131b
FM		 4706 if (sbi->s_journal)
4707 ext4_clear_journal_err(sb, es);
ac27a0ec 4708 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4709 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4710 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4711 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4712 EXT4_FEATURE_INCOMPAT_MMP))
4713 if (ext4_multi_mount_protect(sb,
4714 le64_to_cpu(es->s_mmp_block))) {
4715 err = -EROFS;
4716 goto restore_opts;
4717 }
c79d967d 4718 enable_quota = 1;
ac27a0ec
DK		 4719 }
4720 }
bfff6873
LC		 4721
4722 /*
4723 * Reinitialize lazy itable initialization thread based on
4724 * current settings
4725 */
4726 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4727 ext4_unregister_li_request(sb);
4728 else {
4729 ext4_group_t first_not_zeroed;
4730 first_not_zeroed = ext4_has_uninit_itable(sb);
4731 ext4_register_li_request(sb, first_not_zeroed);
4732 }
4733
6fd058f7 4734 ext4_setup_system_zone(sb);
d096ad0f 4735 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4736 ext4_commit_super(sb, 1);
0390131b 4737
ac27a0ec
DK		 4738#ifdef CONFIG_QUOTA
4739 /* Release old quota file names */
4740 for (i = 0; i < MAXQUOTAS; i++)
4741 if (old_opts.s_qf_names[i] &&
4742 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4743 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4744 if (enable_quota) {
4745 if (sb_any_quota_suspended(sb))
4746 dquot_resume(sb, -1);
4747 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4748 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4749 err = ext4_enable_quotas(sb);
07724f98 4750 if (err)
7c319d32 4751 goto restore_opts;
7c319d32
AK		 4752 }
4753 }
ac27a0ec 4754#endif
d4c402d9
CW		 4755
4756 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4757 kfree(orig_data);
ac27a0ec 4758 return 0;
0b8e58a1 4759
ac27a0ec
DK		 4760restore_opts:
4761 sb->s_flags = old_sb_flags;
4762 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4763 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4764 sbi->s_resuid = old_opts.s_resuid;
4765 sbi->s_resgid = old_opts.s_resgid;
4766 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4767 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4768 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4769#ifdef CONFIG_QUOTA
4770 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4771 for (i = 0; i < MAXQUOTAS; i++) {
4772 if (sbi->s_qf_names[i] &&
4773 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4774 kfree(sbi->s_qf_names[i]);
4775 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4776 }
4777#endif
d4c402d9 4778 kfree(orig_data);
ac27a0ec
DK		 4779 return err;
4780}
4781
2b2d6d01 4782static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4783{
4784 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4785 struct ext4_sb_info *sbi = EXT4_SB(sb);
4786 struct ext4_super_block *es = sbi->s_es;
952fc18e 4787 ext4_fsblk_t overhead = 0;
960cc398 4788 u64 fsid;
d02a9391 4789 s64 bfree;
ac27a0ec 4790
952fc18e
TT		 4791 if (!test_opt(sb, MINIX_DF))
4792 overhead = sbi->s_overhead;
ac27a0ec 4793
617ba13b 4794 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4795 buf->f_bsize = sb->s_blocksize;
b72f78cb 4796 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4797 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4798 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4799 /* prevent underflow in case that few free space is available */
57042651 4800 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4801 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4802 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4803 buf->f_bavail = 0;
4804 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4805 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4806 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4807 fsid = le64_to_cpup((void *)es->s_uuid) ^
4808 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4809 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4810 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4811
ac27a0ec
DK		 4812 return 0;
4813}
4814
0b8e58a1
AD		 4815/* Helper function for writing quotas on sync - we need to start transaction
4816 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4817 * Process 1 Process 2
617ba13b 4818 * ext4_create() quota_sync()
a269eb18 4819 * jbd2_journal_start() write_dquot()
871a2931 4820 * dquot_initialize() down(dqio_mutex)
dab291af 4821 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4822 *
4823 */
4824
4825#ifdef CONFIG_QUOTA
4826
4827static inline struct inode *dquot_to_inode(struct dquot *dquot)
4828{
4c376dca 4829 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4830}
4831
617ba13b 4832static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4833{
4834 int ret, err;
4835 handle_t *handle;
4836 struct inode *inode;
4837
4838 inode = dquot_to_inode(dquot);
617ba13b 4839 handle = ext4_journal_start(inode,
0b8e58a1 4840 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4841 if (IS_ERR(handle))
4842 return PTR_ERR(handle);
4843 ret = dquot_commit(dquot);
617ba13b 4844 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4845 if (!ret)
4846 ret = err;
4847 return ret;
4848}
4849
617ba13b 4850static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4851{
4852 int ret, err;
4853 handle_t *handle;
4854
617ba13b 4855 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4856 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4857 if (IS_ERR(handle))
4858 return PTR_ERR(handle);
4859 ret = dquot_acquire(dquot);
617ba13b 4860 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4861 if (!ret)
4862 ret = err;
4863 return ret;
4864}
4865
617ba13b 4866static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4867{
4868 int ret, err;
4869 handle_t *handle;
4870
617ba13b 4871 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4872 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4873 if (IS_ERR(handle)) {
4874 /* Release dquot anyway to avoid endless cycle in dqput() */
4875 dquot_release(dquot);
ac27a0ec 4876 return PTR_ERR(handle);
9c3013e9 4877 }
ac27a0ec 4878 ret = dquot_release(dquot);
617ba13b 4879 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4880 if (!ret)
4881 ret = err;
4882 return ret;
4883}
4884
617ba13b 4885static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4886{
2c8be6b2 4887 /* Are we journaling quotas? */
617ba13b
MC		 4888 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4889 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4890 dquot_mark_dquot_dirty(dquot);
617ba13b 4891 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4892 } else {
4893 return dquot_mark_dquot_dirty(dquot);
4894 }
4895}
4896
617ba13b 4897static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4898{
4899 int ret, err;
4900 handle_t *handle;
4901
4902 /* Data block + inode block */
617ba13b 4903 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4904 if (IS_ERR(handle))
4905 return PTR_ERR(handle);
4906 ret = dquot_commit_info(sb, type);
617ba13b 4907 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4908 if (!ret)
4909 ret = err;
4910 return ret;
4911}
4912
4913/*
4914 * Turn on quotas during mount time - we need to find
4915 * the quota file and such...
4916 */
617ba13b 4917static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4918{
287a8095
CH		 4919 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4920 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4921}
4922
4923/*
4924 * Standard function to be called on quota_on
4925 */
617ba13b 4926static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4927 struct path *path)
ac27a0ec
DK		 4928{
4929 int err;
ac27a0ec
DK		 4930
4931 if (!test_opt(sb, QUOTA))
4932 return -EINVAL;
0623543b 4933
ac27a0ec 4934 /* Quotafile not on the same filesystem? */
d8c9584e 4935 if (path->dentry->d_sb != sb)
ac27a0ec 4936 return -EXDEV;
0623543b
JK		 4937 /* Journaling quota? */
4938 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4939 /* Quotafile not in fs root? */
f00c9e44 4940 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4941 ext4_msg(sb, KERN_WARNING,
4942 "Quota file not on filesystem root. "
4943 "Journaled quota will not work");
2b2d6d01 4944 }
0623543b
JK		 4945
4946 /*
4947 * When we journal data on quota file, we have to flush journal to see
4948 * all updates to the file when we bypass pagecache...
4949 */
0390131b 4950 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4951 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4952 /*
4953 * We don't need to lock updates but journal_flush() could
4954 * otherwise be livelocked...
4955 */
4956 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4957 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4958 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4959 if (err)
7ffe1ea8 4960 return err;
0623543b
JK		 4961 }
4962
f00c9e44 4963 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4964}
4965
7c319d32
AK		 4966static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4967 unsigned int flags)
4968{
4969 int err;
4970 struct inode *qf_inode;
4971 unsigned long qf_inums[MAXQUOTAS] = {
4972 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4973 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4974 };
4975
4976 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4977
4978 if (!qf_inums[type])
4979 return -EPERM;
4980
4981 qf_inode = ext4_iget(sb, qf_inums[type]);
4982 if (IS_ERR(qf_inode)) {
4983 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4984 return PTR_ERR(qf_inode);
4985 }
4986
4987 err = dquot_enable(qf_inode, type, format_id, flags);
4988 iput(qf_inode);
4989
4990 return err;
4991}
4992
4993/* Enable usage tracking for all quota types. */
4994static int ext4_enable_quotas(struct super_block *sb)
4995{
4996 int type, err = 0;
4997 unsigned long qf_inums[MAXQUOTAS] = {
4998 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4999 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5000 };
5001
5002 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5003 for (type = 0; type < MAXQUOTAS; type++) {
5004 if (qf_inums[type]) {
5005 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5006 DQUOT_USAGE_ENABLED);
5007 if (err) {
5008 ext4_warning(sb,
5009 "Failed to enable quota (type=%d) "
5010 "tracking. Please run e2fsck to fix.",
5011 type);
5012 return err;
5013 }
5014 }
5015 }
5016 return 0;
5017}
5018
5019/*
5020 * quota_on function that is used when QUOTA feature is set.
5021 */
5022static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5023 int format_id)
5024{
5025 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5026 return -EINVAL;
5027
5028 /*
5029 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5030 */
5031 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5032}
5033
ca0e05e4
DM		 5034static int ext4_quota_off(struct super_block *sb, int type)
5035{
21f97697
JK		 5036 struct inode *inode = sb_dqopt(sb)->files[type];
5037 handle_t *handle;
5038
87009d86
DM		 5039 /* Force all delayed allocation blocks to be allocated.
5040 * Caller already holds s_umount sem */
5041 if (test_opt(sb, DELALLOC))
ca0e05e4 5042 sync_filesystem(sb);
ca0e05e4 5043
0b268590
AG		 5044 if (!inode)
5045 goto out;
5046
21f97697
JK		 5047 /* Update modification times of quota files when userspace can
5048 * start looking at them */
5049 handle = ext4_journal_start(inode, 1);
5050 if (IS_ERR(handle))
5051 goto out;
5052 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5053 ext4_mark_inode_dirty(handle, inode);
5054 ext4_journal_stop(handle);
5055
5056out:
ca0e05e4
DM		 5057 return dquot_quota_off(sb, type);
5058}
5059
7c319d32
AK		 5060/*
5061 * quota_off function that is used when QUOTA feature is set.
5062 */
5063static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5064{
5065 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5066 return -EINVAL;
5067
5068 /* Disable only the limits. */
5069 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5070}
5071
ac27a0ec
DK		 5072/* Read data from quotafile - avoid pagecache and such because we cannot afford
5073 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5074 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5075 * we don't have to be afraid of races */
617ba13b 5076static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5077 size_t len, loff_t off)
5078{
5079 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5080 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5081 int err = 0;
5082 int offset = off & (sb->s_blocksize - 1);
5083 int tocopy;
5084 size_t toread;
5085 struct buffer_head *bh;
5086 loff_t i_size = i_size_read(inode);
5087
5088 if (off > i_size)
5089 return 0;
5090 if (off+len > i_size)
5091 len = i_size-off;
5092 toread = len;
5093 while (toread > 0) {
5094 tocopy = sb->s_blocksize - offset < toread ?
5095 sb->s_blocksize - offset : toread;
617ba13b 5096 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5097 if (err)
5098 return err;
5099 if (!bh) /* A hole? */
5100 memset(data, 0, tocopy);
5101 else
5102 memcpy(data, bh->b_data+offset, tocopy);
5103 brelse(bh);
5104 offset = 0;
5105 toread -= tocopy;
5106 data += tocopy;
5107 blk++;
5108 }
5109 return len;
5110}
5111
5112/* Write to quotafile (we know the transaction is already started and has
5113 * enough credits) */
617ba13b 5114static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5115 const char *data, size_t len, loff_t off)
5116{
5117 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5118 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5119 int err = 0;
5120 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5121 struct buffer_head *bh;
5122 handle_t *handle = journal_current_handle();
5123
0390131b 5124 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5125 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5126 " cancelled because transaction is not started",
9c3013e9
JK		 5127 (unsigned long long)off, (unsigned long long)len);
5128 return -EIO;
5129 }
67eeb568
DM		 5130 /*
5131 * Since we account only one data block in transaction credits,
5132 * then it is impossible to cross a block boundary.
5133 */
5134 if (sb->s_blocksize - offset < len) {
5135 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5136 " cancelled because not block aligned",
5137 (unsigned long long)off, (unsigned long long)len);
5138 return -EIO;
5139 }
5140
67eeb568
DM		 5141 bh = ext4_bread(handle, inode, blk, 1, &err);
5142 if (!bh)
5143 goto out;
62d2b5f2
JK		 5144 err = ext4_journal_get_write_access(handle, bh);
5145 if (err) {
5146 brelse(bh);
5147 goto out;
ac27a0ec 5148 }
67eeb568
DM		 5149 lock_buffer(bh);
5150 memcpy(bh->b_data+offset, data, len);
5151 flush_dcache_page(bh->b_page);
5152 unlock_buffer(bh);
62d2b5f2 5153 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5154 brelse(bh);
ac27a0ec 5155out:
0b7f7cef 5156 if (err)
ac27a0ec 5157 return err;
67eeb568
DM		 5158 if (inode->i_size < off + len) {
5159 i_size_write(inode, off + len);
617ba13b 5160 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5161 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5162 }
67eeb568 5163 return len;
ac27a0ec
DK		 5164}
5165
5166#endif
5167
152a0836
AV		 5168static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5169 const char *dev_name, void *data)
ac27a0ec 5170{
152a0836 5171 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5172}
5173
37f328eb 5174#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5175static inline void register_as_ext2(void)
5176{
5177 int err = register_filesystem(&ext2_fs_type);
5178 if (err)
5179 printk(KERN_WARNING
5180 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5181}
5182
5183static inline void unregister_as_ext2(void)
5184{
5185 unregister_filesystem(&ext2_fs_type);
5186}
2035e776
TT		 5187
5188static inline int ext2_feature_set_ok(struct super_block *sb)
5189{
5190 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5191 return 0;
5192 if (sb->s_flags & MS_RDONLY)
5193 return 1;
5194 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5195 return 0;
5196 return 1;
5197}
51b7e3c9 5198MODULE_ALIAS("ext2");
24b58424
TT		 5199#else
5200static inline void register_as_ext2(void) { }
5201static inline void unregister_as_ext2(void) { }
2035e776 5202static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5203#endif
5204
37f328eb 5205#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5206static inline void register_as_ext3(void)
5207{
5208 int err = register_filesystem(&ext3_fs_type);
5209 if (err)
5210 printk(KERN_WARNING
5211 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5212}
5213
5214static inline void unregister_as_ext3(void)
5215{
5216 unregister_filesystem(&ext3_fs_type);
5217}
2035e776
TT		 5218
5219static inline int ext3_feature_set_ok(struct super_block *sb)
5220{
5221 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5222 return 0;
5223 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5224 return 0;
5225 if (sb->s_flags & MS_RDONLY)
5226 return 1;
5227 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5228 return 0;
5229 return 1;
5230}
51b7e3c9 5231MODULE_ALIAS("ext3");
24b58424
TT		 5232#else
5233static inline void register_as_ext3(void) { }
5234static inline void unregister_as_ext3(void) { }
2035e776 5235static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5236#endif
5237
03010a33
TT		 5238static struct file_system_type ext4_fs_type = {
5239 .owner = THIS_MODULE,
5240 .name = "ext4",
152a0836 5241 .mount = ext4_mount,
03010a33
TT		 5242 .kill_sb = kill_block_super,
5243 .fs_flags = FS_REQUIRES_DEV,
5244};
5245
8f021222 5246static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5247{
5248 struct ext4_features *ef;
5249 int ret = -ENOMEM;
5250
5251 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5252 if (!ef)
5253 goto out;
5254
5255 ef->f_kobj.kset = ext4_kset;
5256 init_completion(&ef->f_kobj_unregister);
5257 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5258 "features");
5259 if (ret) {
5260 kfree(ef);
5261 goto out;
5262 }
5263
5264 ext4_feat = ef;
5265 ret = 0;
5266out:
5267 return ret;
5268}
5269
8f021222
LC		 5270static void ext4_exit_feat_adverts(void)
5271{
5272 kobject_put(&ext4_feat->f_kobj);
5273 wait_for_completion(&ext4_feat->f_kobj_unregister);
5274 kfree(ext4_feat);
5275}
5276
e9e3bcec
ES		 5277/* Shared across all ext4 file systems */
5278wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5279struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5280
5dabfc78 5281static int __init ext4_init_fs(void)
ac27a0ec 5282{
e9e3bcec 5283 int i, err;
c9de560d 5284
07c0c5d8
AV		 5285 ext4_li_info = NULL;
5286 mutex_init(&ext4_li_mtx);
5287
9a4c8019 5288 /* Build-time check for flags consistency */
12e9b892 5289 ext4_check_flag_values();
e9e3bcec
ES		 5290
5291 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5292 mutex_init(&ext4__aio_mutex[i]);
5293 init_waitqueue_head(&ext4__ioend_wq[i]);
5294 }
5295
51865fda 5296 err = ext4_init_es();
6fd058f7
TT		 5297 if (err)
5298 return err;
51865fda
ZL		 5299
5300 err = ext4_init_pageio();
5301 if (err)
5302 goto out7;
5303
5dabfc78 5304 err = ext4_init_system_zone();
bd2d0210 5305 if (err)
d44651d0 5306 goto out6;
3197ebdb 5307 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5308 if (!ext4_kset) {
5309 err = -ENOMEM;
dd68314c 5310 goto out5;
0e376b1e 5311 }
d44651d0 5312 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5313
5314 err = ext4_init_feat_adverts();
dd68314c
TT		 5315 if (err)
5316 goto out4;
857ac889 5317
5dabfc78 5318 err = ext4_init_mballoc();
ac27a0ec 5319 if (err)
6fd058f7 5320 goto out3;
c9de560d 5321
5dabfc78 5322 err = ext4_init_xattr();
c9de560d
AT		 5323 if (err)
5324 goto out2;
ac27a0ec
DK		 5325 err = init_inodecache();
5326 if (err)
5327 goto out1;
24b58424 5328 register_as_ext3();
2035e776 5329 register_as_ext2();
03010a33 5330 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5331 if (err)
5332 goto out;
bfff6873 5333
ac27a0ec
DK		 5334 return 0;
5335out:
24b58424
TT		 5336 unregister_as_ext2();
5337 unregister_as_ext3();
ac27a0ec
DK		 5338 destroy_inodecache();
5339out1:
5dabfc78 5340 ext4_exit_xattr();
c9de560d 5341out2:
5dabfc78 5342 ext4_exit_mballoc();
6fd058f7 5343out3:
8f021222 5344 ext4_exit_feat_adverts();
dd68314c 5345out4:
d44651d0
FJ		 5346 if (ext4_proc_root)
5347 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5348 kset_unregister(ext4_kset);
d44651d0 5349out5:
5dabfc78 5350 ext4_exit_system_zone();
d44651d0 5351out6:
5dabfc78 5352 ext4_exit_pageio();
51865fda
ZL		 5353out7:
5354 ext4_exit_es();
5355
ac27a0ec
DK		 5356 return err;
5357}
5358
5dabfc78 5359static void __exit ext4_exit_fs(void)
ac27a0ec 5360{
bfff6873 5361 ext4_destroy_lazyinit_thread();
24b58424
TT		 5362 unregister_as_ext2();
5363 unregister_as_ext3();
03010a33 5364 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5365 destroy_inodecache();
5dabfc78
TT		 5366 ext4_exit_xattr();
5367 ext4_exit_mballoc();
8f021222 5368 ext4_exit_feat_adverts();
9f6200bb 5369 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5370 kset_unregister(ext4_kset);
5dabfc78
TT		 5371 ext4_exit_system_zone();
5372 ext4_exit_pageio();
ac27a0ec
DK		 5373}
5374
5375MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5376MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5377MODULE_LICENSE("GPL");
5dabfc78
TT		 5378module_init(ext4_init_fs)
5379module_exit(ext4_exit_fs)
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