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fs: push rcu_barrier() from deactivate_locked_super() to filesystems
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
109#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110#else
111#define IS_EXT3_SB(sb) (0)
112#endif
bd81d8ee 113
d25425f8
DW		 114static int ext4_verify_csum_type(struct super_block *sb,
115 struct ext4_super_block *es)
116{
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
119 return 1;
120
121 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
122}
123
a9c47317
DW		 124static __le32 ext4_superblock_csum(struct super_block *sb,
125 struct ext4_super_block *es)
126{
127 struct ext4_sb_info *sbi = EXT4_SB(sb);
128 int offset = offsetof(struct ext4_super_block, s_checksum);
129 __u32 csum;
130
131 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
132
133 return cpu_to_le32(csum);
134}
135
136int ext4_superblock_csum_verify(struct super_block *sb,
137 struct ext4_super_block *es)
138{
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
141 return 1;
142
143 return es->s_checksum == ext4_superblock_csum(sb, es);
144}
145
146void ext4_superblock_csum_set(struct super_block *sb,
147 struct ext4_super_block *es)
148{
149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
150 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
151 return;
152
153 es->s_checksum = ext4_superblock_csum(sb, es);
154}
155
9933fc0a
TT		 156void *ext4_kvmalloc(size_t size, gfp_t flags)
157{
158 void *ret;
159
160 ret = kmalloc(size, flags);
161 if (!ret)
162 ret = __vmalloc(size, flags, PAGE_KERNEL);
163 return ret;
164}
165
166void *ext4_kvzalloc(size_t size, gfp_t flags)
167{
168 void *ret;
169
db9481c0 170 ret = kzalloc(size, flags);
9933fc0a
TT		 171 if (!ret)
172 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
173 return ret;
174}
175
176void ext4_kvfree(void *ptr)
177{
178 if (is_vmalloc_addr(ptr))
179 vfree(ptr);
180 else
181 kfree(ptr);
182
183}
184
8fadc143
AR		 185ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
186 struct ext4_group_desc *bg)
bd81d8ee 187{
3a14589c 188 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 189 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 190 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 191}
192
8fadc143
AR		 193ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
194 struct ext4_group_desc *bg)
bd81d8ee 195{
5272f837 196 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 197 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 198 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 199}
200
8fadc143
AR		 201ext4_fsblk_t ext4_inode_table(struct super_block *sb,
202 struct ext4_group_desc *bg)
bd81d8ee 203{
5272f837 204 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 206 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 207}
208
021b65bb
TT		 209__u32 ext4_free_group_clusters(struct super_block *sb,
210 struct ext4_group_desc *bg)
560671a0
AK		 211{
212 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 214 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 215}
216
217__u32 ext4_free_inodes_count(struct super_block *sb,
218 struct ext4_group_desc *bg)
219{
220 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 222 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 223}
224
225__u32 ext4_used_dirs_count(struct super_block *sb,
226 struct ext4_group_desc *bg)
227{
228 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 230 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 231}
232
233__u32 ext4_itable_unused_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235{
236 return le16_to_cpu(bg->bg_itable_unused_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 238 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 239}
240
8fadc143
AR		 241void ext4_block_bitmap_set(struct super_block *sb,
242 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 243{
3a14589c 244 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 245 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
246 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 247}
248
8fadc143
AR		 249void ext4_inode_bitmap_set(struct super_block *sb,
250 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 251{
5272f837 252 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 253 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
254 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 255}
256
8fadc143
AR		 257void ext4_inode_table_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 259{
5272f837 260 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 263}
264
021b65bb
TT		 265void ext4_free_group_clusters_set(struct super_block *sb,
266 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 267{
268 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
271}
272
273void ext4_free_inodes_set(struct super_block *sb,
274 struct ext4_group_desc *bg, __u32 count)
275{
276 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
279}
280
281void ext4_used_dirs_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
283{
284 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
287}
288
289void ext4_itable_unused_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291{
292 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
295}
296
d3d1faf6
CW		 297
298/* Just increment the non-pointer handle value */
299static handle_t *ext4_get_nojournal(void)
300{
301 handle_t *handle = current->journal_info;
302 unsigned long ref_cnt = (unsigned long)handle;
303
304 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
305
306 ref_cnt++;
307 handle = (handle_t *)ref_cnt;
308
309 current->journal_info = handle;
310 return handle;
311}
312
313
314/* Decrement the non-pointer handle value */
315static void ext4_put_nojournal(handle_t *handle)
316{
317 unsigned long ref_cnt = (unsigned long)handle;
318
319 BUG_ON(ref_cnt == 0);
320
321 ref_cnt--;
322 handle = (handle_t *)ref_cnt;
323
324 current->journal_info = handle;
325}
326
ac27a0ec 327/*
dab291af 328 * Wrappers for jbd2_journal_start/end.
ac27a0ec 329 */
617ba13b 330handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 331{
332 journal_t *journal;
333
12706394 334 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 335 if (sb->s_flags & MS_RDONLY)
336 return ERR_PTR(-EROFS);
337
8e8ad8a5 338 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
617ba13b 339 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 340 if (!journal)
341 return ext4_get_nojournal();
342 /*
343 * Special case here: if the journal has aborted behind our
344 * backs (eg. EIO in the commit thread), then we still need to
345 * take the FS itself readonly cleanly.
346 */
347 if (is_journal_aborted(journal)) {
348 ext4_abort(sb, "Detected aborted journal");
349 return ERR_PTR(-EROFS);
ac27a0ec 350 }
be4f27d3 351 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 352}
353
c398eda0 354int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 355{
356 struct super_block *sb;
357 int err;
358 int rc;
359
0390131b 360 if (!ext4_handle_valid(handle)) {
d3d1faf6 361 ext4_put_nojournal(handle);
0390131b
FM		 362 return 0;
363 }
ac27a0ec
DK		 364 sb = handle->h_transaction->t_journal->j_private;
365 err = handle->h_err;
dab291af 366 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 367
368 if (!err)
369 err = rc;
370 if (err)
c398eda0 371 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 372 return err;
373}
374
90c7201b
TT		 375void ext4_journal_abort_handle(const char *caller, unsigned int line,
376 const char *err_fn, struct buffer_head *bh,
377 handle_t *handle, int err)
ac27a0ec
DK		 378{
379 char nbuf[16];
617ba13b 380 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 381
0390131b
FM		 382 BUG_ON(!ext4_handle_valid(handle));
383
ac27a0ec
DK		 384 if (bh)
385 BUFFER_TRACE(bh, "abort");
386
387 if (!handle->h_err)
388 handle->h_err = err;
389
390 if (is_handle_aborted(handle))
391 return;
392
92b97816 393 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 394 caller, line, errstr, err_fn);
ac27a0ec 395
dab291af 396 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 397}
398
1c13d5c0
TT		 399static void __save_error_info(struct super_block *sb, const char *func,
400 unsigned int line)
401{
402 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
403
404 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
405 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
406 es->s_last_error_time = cpu_to_le32(get_seconds());
407 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
408 es->s_last_error_line = cpu_to_le32(line);
409 if (!es->s_first_error_time) {
410 es->s_first_error_time = es->s_last_error_time;
411 strncpy(es->s_first_error_func, func,
412 sizeof(es->s_first_error_func));
413 es->s_first_error_line = cpu_to_le32(line);
414 es->s_first_error_ino = es->s_last_error_ino;
415 es->s_first_error_block = es->s_last_error_block;
416 }
66e61a9e
TT		 417 /*
418 * Start the daily error reporting function if it hasn't been
419 * started already
420 */
421 if (!es->s_error_count)
422 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 423 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
424}
425
426static void save_error_info(struct super_block *sb, const char *func,
427 unsigned int line)
428{
429 __save_error_info(sb, func, line);
430 ext4_commit_super(sb, 1);
431}
432
7c2e7087
TT		 433/*
434 * The del_gendisk() function uninitializes the disk-specific data
435 * structures, including the bdi structure, without telling anyone
436 * else. Once this happens, any attempt to call mark_buffer_dirty()
437 * (for example, by ext4_commit_super), will cause a kernel OOPS.
438 * This is a kludge to prevent these oops until we can put in a proper
439 * hook in del_gendisk() to inform the VFS and file system layers.
440 */
441static int block_device_ejected(struct super_block *sb)
442{
443 struct inode *bd_inode = sb->s_bdev->bd_inode;
444 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
445
446 return bdi->dev == NULL;
447}
448
18aadd47
BJ		 449static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
450{
451 struct super_block *sb = journal->j_private;
452 struct ext4_sb_info *sbi = EXT4_SB(sb);
453 int error = is_journal_aborted(journal);
454 struct ext4_journal_cb_entry *jce, *tmp;
455
456 spin_lock(&sbi->s_md_lock);
457 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
458 list_del_init(&jce->jce_list);
459 spin_unlock(&sbi->s_md_lock);
460 jce->jce_func(sb, jce, error);
461 spin_lock(&sbi->s_md_lock);
462 }
463 spin_unlock(&sbi->s_md_lock);
464}
1c13d5c0 465
ac27a0ec
DK		 466/* Deal with the reporting of failure conditions on a filesystem such as
467 * inconsistencies detected or read IO failures.
468 *
469 * On ext2, we can store the error state of the filesystem in the
617ba13b 470 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 471 * write ordering constraints on the superblock which prevent us from
472 * writing it out straight away; and given that the journal is about to
473 * be aborted, we can't rely on the current, or future, transactions to
474 * write out the superblock safely.
475 *
dab291af 476 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 477 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 478 * that error until we've noted it down and cleared it.
479 */
480
617ba13b 481static void ext4_handle_error(struct super_block *sb)
ac27a0ec 482{
ac27a0ec
DK		 483 if (sb->s_flags & MS_RDONLY)
484 return;
485
2b2d6d01 486 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 487 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 488
4ab2f15b 489 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 490 if (journal)
dab291af 491 jbd2_journal_abort(journal, -EIO);
ac27a0ec 492 }
2b2d6d01 493 if (test_opt(sb, ERRORS_RO)) {
b31e1552 494 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 495 sb->s_flags |= MS_RDONLY;
496 }
ac27a0ec 497 if (test_opt(sb, ERRORS_PANIC))
617ba13b 498 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 499 sb->s_id);
500}
501
12062ddd 502void __ext4_error(struct super_block *sb, const char *function,
c398eda0 503 unsigned int line, const char *fmt, ...)
ac27a0ec 504{
0ff2ea7d 505 struct va_format vaf;
ac27a0ec
DK		 506 va_list args;
507
508 va_start(args, fmt);
0ff2ea7d
JP		 509 vaf.fmt = fmt;
510 vaf.va = &args;
511 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
512 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 513 va_end(args);
f3fc0210 514 save_error_info(sb, function, line);
ac27a0ec 515
617ba13b 516 ext4_handle_error(sb);
ac27a0ec
DK		 517}
518
c398eda0
TT		 519void ext4_error_inode(struct inode *inode, const char *function,
520 unsigned int line, ext4_fsblk_t block,
273df556
FM		 521 const char *fmt, ...)
522{
523 va_list args;
f7c21177 524 struct va_format vaf;
1c13d5c0 525 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 526
1c13d5c0
TT		 527 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
528 es->s_last_error_block = cpu_to_le64(block);
529 save_error_info(inode->i_sb, function, line);
273df556 530 va_start(args, fmt);
f7c21177
TT		 531 vaf.fmt = fmt;
532 vaf.va = &args;
c398eda0 533 if (block)
d9ee81da
JP		 534 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
535 "inode #%lu: block %llu: comm %s: %pV\n",
536 inode->i_sb->s_id, function, line, inode->i_ino,
537 block, current->comm, &vaf);
538 else
539 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
540 "inode #%lu: comm %s: %pV\n",
541 inode->i_sb->s_id, function, line, inode->i_ino,
542 current->comm, &vaf);
273df556
FM		 543 va_end(args);
544
545 ext4_handle_error(inode->i_sb);
546}
547
c398eda0 548void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 549 unsigned int line, ext4_fsblk_t block,
550 const char *fmt, ...)
273df556
FM		 551{
552 va_list args;
f7c21177 553 struct va_format vaf;
1c13d5c0 554 struct ext4_super_block *es;
273df556
FM		 555 struct inode *inode = file->f_dentry->d_inode;
556 char pathname[80], *path;
557
1c13d5c0
TT		 558 es = EXT4_SB(inode->i_sb)->s_es;
559 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
560 save_error_info(inode->i_sb, function, line);
273df556 561 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 562 if (IS_ERR(path))
273df556 563 path = "(unknown)";
f7c21177
TT		 564 va_start(args, fmt);
565 vaf.fmt = fmt;
566 vaf.va = &args;
d9ee81da
JP		 567 if (block)
568 printk(KERN_CRIT
569 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
570 "block %llu: comm %s: path %s: %pV\n",
571 inode->i_sb->s_id, function, line, inode->i_ino,
572 block, current->comm, path, &vaf);
573 else
574 printk(KERN_CRIT
575 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
576 "comm %s: path %s: %pV\n",
577 inode->i_sb->s_id, function, line, inode->i_ino,
578 current->comm, path, &vaf);
273df556
FM		 579 va_end(args);
580
581 ext4_handle_error(inode->i_sb);
582}
583
2b2d6d01 584static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 585 char nbuf[16])
586{
587 char *errstr = NULL;
588
589 switch (errno) {
590 case -EIO:
591 errstr = "IO failure";
592 break;
593 case -ENOMEM:
594 errstr = "Out of memory";
595 break;
596 case -EROFS:
78f1ddbb
TT		 597 if (!sb || (EXT4_SB(sb)->s_journal &&
598 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 599 errstr = "Journal has aborted";
600 else
601 errstr = "Readonly filesystem";
602 break;
603 default:
604 /* If the caller passed in an extra buffer for unknown
605 * errors, textualise them now. Else we just return
606 * NULL. */
607 if (nbuf) {
608 /* Check for truncated error codes... */
609 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
610 errstr = nbuf;
611 }
612 break;
613 }
614
615 return errstr;
616}
617
617ba13b 618/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 619 * automatically and invokes the appropriate error response. */
620
c398eda0
TT		 621void __ext4_std_error(struct super_block *sb, const char *function,
622 unsigned int line, int errno)
ac27a0ec
DK		 623{
624 char nbuf[16];
625 const char *errstr;
626
627 /* Special case: if the error is EROFS, and we're not already
628 * inside a transaction, then there's really no point in logging
629 * an error. */
630 if (errno == -EROFS && journal_current_handle() == NULL &&
631 (sb->s_flags & MS_RDONLY))
632 return;
633
617ba13b 634 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 635 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
636 sb->s_id, function, line, errstr);
1c13d5c0 637 save_error_info(sb, function, line);
ac27a0ec 638
617ba13b 639 ext4_handle_error(sb);
ac27a0ec
DK		 640}
641
642/*
617ba13b 643 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 644 * abort function may be used to deal with unrecoverable failures such
645 * as journal IO errors or ENOMEM at a critical moment in log management.
646 *
647 * We unconditionally force the filesystem into an ABORT|READONLY state,
648 * unless the error response on the fs has been set to panic in which
649 * case we take the easy way out and panic immediately.
650 */
651
c67d859e 652void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 653 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 654{
655 va_list args;
656
1c13d5c0 657 save_error_info(sb, function, line);
ac27a0ec 658 va_start(args, fmt);
c398eda0
TT		 659 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
660 function, line);
ac27a0ec
DK		 661 vprintk(fmt, args);
662 printk("\n");
663 va_end(args);
664
1c13d5c0
TT		 665 if ((sb->s_flags & MS_RDONLY) == 0) {
666 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
667 sb->s_flags |= MS_RDONLY;
668 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
669 if (EXT4_SB(sb)->s_journal)
670 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
671 save_error_info(sb, function, line);
672 }
ac27a0ec 673 if (test_opt(sb, ERRORS_PANIC))
617ba13b 674 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 675}
676
0ff2ea7d 677void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 678{
0ff2ea7d 679 struct va_format vaf;
b31e1552
ES		 680 va_list args;
681
682 va_start(args, fmt);
0ff2ea7d
JP		 683 vaf.fmt = fmt;
684 vaf.va = &args;
685 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 686 va_end(args);
687}
688
12062ddd 689void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 690 unsigned int line, const char *fmt, ...)
ac27a0ec 691{
0ff2ea7d 692 struct va_format vaf;
ac27a0ec
DK		 693 va_list args;
694
695 va_start(args, fmt);
0ff2ea7d
JP		 696 vaf.fmt = fmt;
697 vaf.va = &args;
698 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
699 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 700 va_end(args);
701}
702
e29136f8
TT		 703void __ext4_grp_locked_error(const char *function, unsigned int line,
704 struct super_block *sb, ext4_group_t grp,
705 unsigned long ino, ext4_fsblk_t block,
706 const char *fmt, ...)
5d1b1b3f
AK		 707__releases(bitlock)
708__acquires(bitlock)
709{
0ff2ea7d 710 struct va_format vaf;
5d1b1b3f
AK		 711 va_list args;
712 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
713
1c13d5c0
TT		 714 es->s_last_error_ino = cpu_to_le32(ino);
715 es->s_last_error_block = cpu_to_le64(block);
716 __save_error_info(sb, function, line);
0ff2ea7d 717
5d1b1b3f 718 va_start(args, fmt);
0ff2ea7d
JP		 719
720 vaf.fmt = fmt;
721 vaf.va = &args;
21149d61 722 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 723 sb->s_id, function, line, grp);
724 if (ino)
0ff2ea7d 725 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 726 if (block)
0ff2ea7d
JP		 727 printk(KERN_CONT "block %llu:", (unsigned long long) block);
728 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 729 va_end(args);
730
731 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 732 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 733 return;
734 }
1c13d5c0 735
5d1b1b3f
AK		 736 ext4_unlock_group(sb, grp);
737 ext4_handle_error(sb);
738 /*
739 * We only get here in the ERRORS_RO case; relocking the group
740 * may be dangerous, but nothing bad will happen since the
741 * filesystem will have already been marked read/only and the
742 * journal has been aborted. We return 1 as a hint to callers
743 * who might what to use the return value from
25985edc 744 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 745 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
746 * aggressively from the ext4 function in question, with a
747 * more appropriate error code.
748 */
749 ext4_lock_group(sb, grp);
750 return;
751}
752
617ba13b 753void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 754{
617ba13b 755 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 756
617ba13b 757 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 758 return;
759
12062ddd 760 ext4_warning(sb,
ac27a0ec
DK		 761 "updating to rev %d because of new feature flag, "
762 "running e2fsck is recommended",
617ba13b 763 EXT4_DYNAMIC_REV);
ac27a0ec 764
617ba13b
MC		 765 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
766 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
767 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 768 /* leave es->s_feature_*compat flags alone */
769 /* es->s_uuid will be set by e2fsck if empty */
770
771 /*
772 * The rest of the superblock fields should be zero, and if not it
773 * means they are likely already in use, so leave them alone. We
774 * can leave it up to e2fsck to clean up any inconsistencies there.
775 */
776}
777
778/*
779 * Open the external journal device
780 */
b31e1552 781static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 782{
783 struct block_device *bdev;
784 char b[BDEVNAME_SIZE];
785
d4d77629 786 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 787 if (IS_ERR(bdev))
788 goto fail;
789 return bdev;
790
791fail:
b31e1552 792 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 793 __bdevname(dev, b), PTR_ERR(bdev));
794 return NULL;
795}
796
797/*
798 * Release the journal device
799 */
617ba13b 800static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 801{
e525fd89 802 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 803}
804
617ba13b 805static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 806{
807 struct block_device *bdev;
808 int ret = -ENODEV;
809
810 bdev = sbi->journal_bdev;
811 if (bdev) {
617ba13b 812 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 813 sbi->journal_bdev = NULL;
814 }
815 return ret;
816}
817
818static inline struct inode *orphan_list_entry(struct list_head *l)
819{
617ba13b 820 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 821}
822
617ba13b 823static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 824{
825 struct list_head *l;
826
b31e1552
ES		 827 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
828 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 829
830 printk(KERN_ERR "sb_info orphan list:\n");
831 list_for_each(l, &sbi->s_orphan) {
832 struct inode *inode = orphan_list_entry(l);
833 printk(KERN_ERR " "
834 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
835 inode->i_sb->s_id, inode->i_ino, inode,
836 inode->i_mode, inode->i_nlink,
837 NEXT_ORPHAN(inode));
838 }
839}
840
2b2d6d01 841static void ext4_put_super(struct super_block *sb)
ac27a0ec 842{
617ba13b
MC		 843 struct ext4_sb_info *sbi = EXT4_SB(sb);
844 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 845 int i, err;
ac27a0ec 846
857ac889 847 ext4_unregister_li_request(sb);
e0ccfd95
CH		 848 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
849
4c0425ff
MC		 850 flush_workqueue(sbi->dio_unwritten_wq);
851 destroy_workqueue(sbi->dio_unwritten_wq);
852
a9e220f8 853 lock_super(sb);
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 unlock_super(sb);
921 kobject_put(&sbi->s_kobj);
922 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 923 if (sbi->s_chksum_driver)
924 crypto_free_shash(sbi->s_chksum_driver);
705895b6 925 kfree(sbi->s_blockgroup_lock);
ac27a0ec 926 kfree(sbi);
ac27a0ec
DK		 927}
928
e18b890b 929static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 930
931/*
932 * Called inside transaction, so use GFP_NOFS
933 */
617ba13b 934static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 935{
617ba13b 936 struct ext4_inode_info *ei;
ac27a0ec 937
e6b4f8da 938 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 939 if (!ei)
940 return NULL;
0b8e58a1 941
ac27a0ec 942 ei->vfs_inode.i_version = 1;
91246c00 943 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 944 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 945 INIT_LIST_HEAD(&ei->i_prealloc_list);
946 spin_lock_init(&ei->i_prealloc_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);
8d5d02e6 959 ei->cur_aio_dio = NULL;
b436b9be
JK		 960 ei->i_sync_tid = 0;
961 ei->i_datasync_tid = 0;
f7ad6d2e 962 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 963 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 964
ac27a0ec
DK		 965 return &ei->vfs_inode;
966}
967
7ff9c073
TT		 968static int ext4_drop_inode(struct inode *inode)
969{
970 int drop = generic_drop_inode(inode);
971
972 trace_ext4_drop_inode(inode, drop);
973 return drop;
974}
975
fa0d7e3d
NP		 976static void ext4_i_callback(struct rcu_head *head)
977{
978 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 979 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
980}
981
617ba13b 982static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 983{
9f7dd93d 984 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 985 ext4_msg(inode->i_sb, KERN_ERR,
986 "Inode %lu (%p): orphan list check failed!",
987 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 988 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
989 EXT4_I(inode), sizeof(struct ext4_inode_info),
990 true);
991 dump_stack();
992 }
fa0d7e3d 993 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 994}
995
51cc5068 996static void init_once(void *foo)
ac27a0ec 997{
617ba13b 998 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 999
a35afb83 1000 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 1001#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 1002 init_rwsem(&ei->xattr_sem);
ac27a0ec 1003#endif
0e855ac8 1004 init_rwsem(&ei->i_data_sem);
a35afb83 1005 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1006}
1007
1008static int init_inodecache(void)
1009{
617ba13b
MC		 1010 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1011 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 1012 0, (SLAB_RECLAIM_ACCOUNT|
1013 SLAB_MEM_SPREAD),
20c2df83 1014 init_once);
617ba13b 1015 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1016 return -ENOMEM;
1017 return 0;
1018}
1019
1020static void destroy_inodecache(void)
1021{
8c0a8537
KS		 1022 /*
1023 * Make sure all delayed rcu free inodes are flushed before we
1024 * destroy cache.
1025 */
1026 rcu_barrier();
617ba13b 1027 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1028}
1029
0930fcc1 1030void ext4_clear_inode(struct inode *inode)
ac27a0ec 1031{
0930fcc1 1032 invalidate_inode_buffers(inode);
dbd5768f 1033 clear_inode(inode);
9f754758 1034 dquot_drop(inode);
c2ea3fde 1035 ext4_discard_preallocations(inode);
8aefcd55
TT		 1036 if (EXT4_I(inode)->jinode) {
1037 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1038 EXT4_I(inode)->jinode);
1039 jbd2_free_inode(EXT4_I(inode)->jinode);
1040 EXT4_I(inode)->jinode = NULL;
1041 }
ac27a0ec
DK		 1042}
1043
1b961ac0 1044static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1045 u64 ino, u32 generation)
ac27a0ec 1046{
ac27a0ec 1047 struct inode *inode;
ac27a0ec 1048
617ba13b 1049 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1050 return ERR_PTR(-ESTALE);
617ba13b 1051 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1052 return ERR_PTR(-ESTALE);
1053
1054 /* iget isn't really right if the inode is currently unallocated!!
1055 *
617ba13b 1056 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1057 * deleted, so we should be safe.
1058 *
1059 * Currently we don't know the generation for parent directory, so
1060 * a generation of 0 means "accept any"
1061 */
1d1fe1ee
DH		 1062 inode = ext4_iget(sb, ino);
1063 if (IS_ERR(inode))
1064 return ERR_CAST(inode);
1065 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1066 iput(inode);
1067 return ERR_PTR(-ESTALE);
1068 }
1b961ac0
CH		 1069
1070 return inode;
1071}
1072
1073static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1074 int fh_len, int fh_type)
1b961ac0
CH		 1075{
1076 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1077 ext4_nfs_get_inode);
1078}
1079
1080static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1081 int fh_len, int fh_type)
1b961ac0
CH		 1082{
1083 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1084 ext4_nfs_get_inode);
ac27a0ec
DK		 1085}
1086
c39a7f84
TO		 1087/*
1088 * Try to release metadata pages (indirect blocks, directories) which are
1089 * mapped via the block device. Since these pages could have journal heads
1090 * which would prevent try_to_free_buffers() from freeing them, we must use
1091 * jbd2 layer's try_to_free_buffers() function to release them.
1092 */
0b8e58a1
AD		 1093static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1094 gfp_t wait)
c39a7f84
TO		 1095{
1096 journal_t *journal = EXT4_SB(sb)->s_journal;
1097
1098 WARN_ON(PageChecked(page));
1099 if (!page_has_buffers(page))
1100 return 0;
1101 if (journal)
1102 return jbd2_journal_try_to_free_buffers(journal, page,
1103 wait & ~__GFP_WAIT);
1104 return try_to_free_buffers(page);
1105}
1106
ac27a0ec 1107#ifdef CONFIG_QUOTA
af5bc92d 1108#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1109#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1110
617ba13b
MC		 1111static int ext4_write_dquot(struct dquot *dquot);
1112static int ext4_acquire_dquot(struct dquot *dquot);
1113static int ext4_release_dquot(struct dquot *dquot);
1114static int ext4_mark_dquot_dirty(struct dquot *dquot);
1115static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1116static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1117 struct path *path);
7c319d32
AK		 1118static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1119 int format_id);
ca0e05e4 1120static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1121static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1122static int ext4_quota_on_mount(struct super_block *sb, int type);
1123static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1124 size_t len, loff_t off);
617ba13b 1125static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1126 const char *data, size_t len, loff_t off);
7c319d32
AK		 1127static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1128 unsigned int flags);
1129static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1130
61e225dc 1131static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1132 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1133 .write_dquot = ext4_write_dquot,
1134 .acquire_dquot = ext4_acquire_dquot,
1135 .release_dquot = ext4_release_dquot,
1136 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1137 .write_info = ext4_write_info,
1138 .alloc_dquot = dquot_alloc,
1139 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1140};
1141
0d54b217 1142static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1143 .quota_on = ext4_quota_on,
ca0e05e4 1144 .quota_off = ext4_quota_off,
287a8095
CH		 1145 .quota_sync = dquot_quota_sync,
1146 .get_info = dquot_get_dqinfo,
1147 .set_info = dquot_set_dqinfo,
1148 .get_dqblk = dquot_get_dqblk,
1149 .set_dqblk = dquot_set_dqblk
ac27a0ec 1150};
7c319d32
AK		 1151
1152static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1153 .quota_on_meta = ext4_quota_on_sysfile,
1154 .quota_off = ext4_quota_off_sysfile,
1155 .quota_sync = dquot_quota_sync,
1156 .get_info = dquot_get_dqinfo,
1157 .set_info = dquot_set_dqinfo,
1158 .get_dqblk = dquot_get_dqblk,
1159 .set_dqblk = dquot_set_dqblk
1160};
ac27a0ec
DK		 1161#endif
1162
ee9b6d61 1163static const struct super_operations ext4_sops = {
617ba13b
MC		 1164 .alloc_inode = ext4_alloc_inode,
1165 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1166 .write_inode = ext4_write_inode,
1167 .dirty_inode = ext4_dirty_inode,
7ff9c073 1168 .drop_inode = ext4_drop_inode,
0930fcc1 1169 .evict_inode = ext4_evict_inode,
617ba13b 1170 .put_super = ext4_put_super,
617ba13b 1171 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1172 .freeze_fs = ext4_freeze,
1173 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1174 .statfs = ext4_statfs,
1175 .remount_fs = ext4_remount,
617ba13b 1176 .show_options = ext4_show_options,
ac27a0ec 1177#ifdef CONFIG_QUOTA
617ba13b
MC		 1178 .quota_read = ext4_quota_read,
1179 .quota_write = ext4_quota_write,
ac27a0ec 1180#endif
c39a7f84 1181 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1182};
1183
9ca92389
TT		 1184static const struct super_operations ext4_nojournal_sops = {
1185 .alloc_inode = ext4_alloc_inode,
1186 .destroy_inode = ext4_destroy_inode,
1187 .write_inode = ext4_write_inode,
1188 .dirty_inode = ext4_dirty_inode,
7ff9c073 1189 .drop_inode = ext4_drop_inode,
0930fcc1 1190 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1191 .put_super = ext4_put_super,
1192 .statfs = ext4_statfs,
1193 .remount_fs = ext4_remount,
9ca92389
TT		 1194 .show_options = ext4_show_options,
1195#ifdef CONFIG_QUOTA
1196 .quota_read = ext4_quota_read,
1197 .quota_write = ext4_quota_write,
1198#endif
1199 .bdev_try_to_free_page = bdev_try_to_free_page,
1200};
1201
39655164 1202static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1203 .fh_to_dentry = ext4_fh_to_dentry,
1204 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1205 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1206};
1207
1208enum {
1209 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1210 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1211 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1212 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1213 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1214 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1215 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1216 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1217 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1218 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1219 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1220 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1221 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1222 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1223 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1224 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1225 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1226 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1227};
1228
a447c093 1229static const match_table_t tokens = {
ac27a0ec
DK		 1230 {Opt_bsd_df, "bsddf"},
1231 {Opt_minix_df, "minixdf"},
1232 {Opt_grpid, "grpid"},
1233 {Opt_grpid, "bsdgroups"},
1234 {Opt_nogrpid, "nogrpid"},
1235 {Opt_nogrpid, "sysvgroups"},
1236 {Opt_resgid, "resgid=%u"},
1237 {Opt_resuid, "resuid=%u"},
1238 {Opt_sb, "sb=%u"},
1239 {Opt_err_cont, "errors=continue"},
1240 {Opt_err_panic, "errors=panic"},
1241 {Opt_err_ro, "errors=remount-ro"},
1242 {Opt_nouid32, "nouid32"},
ac27a0ec 1243 {Opt_debug, "debug"},
72578c33
TT		 1244 {Opt_removed, "oldalloc"},
1245 {Opt_removed, "orlov"},
ac27a0ec
DK		 1246 {Opt_user_xattr, "user_xattr"},
1247 {Opt_nouser_xattr, "nouser_xattr"},
1248 {Opt_acl, "acl"},
1249 {Opt_noacl, "noacl"},
e3bb52ae 1250 {Opt_noload, "norecovery"},
5a916be1 1251 {Opt_noload, "noload"},
72578c33
TT		 1252 {Opt_removed, "nobh"},
1253 {Opt_removed, "bh"},
ac27a0ec 1254 {Opt_commit, "commit=%u"},
30773840
TT		 1255 {Opt_min_batch_time, "min_batch_time=%u"},
1256 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1257 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1258 {Opt_journal_checksum, "journal_checksum"},
1259 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1260 {Opt_abort, "abort"},
1261 {Opt_data_journal, "data=journal"},
1262 {Opt_data_ordered, "data=ordered"},
1263 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1264 {Opt_data_err_abort, "data_err=abort"},
1265 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1266 {Opt_offusrjquota, "usrjquota="},
1267 {Opt_usrjquota, "usrjquota=%s"},
1268 {Opt_offgrpjquota, "grpjquota="},
1269 {Opt_grpjquota, "grpjquota=%s"},
1270 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1271 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1272 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1273 {Opt_grpquota, "grpquota"},
1274 {Opt_noquota, "noquota"},
1275 {Opt_quota, "quota"},
1276 {Opt_usrquota, "usrquota"},
1277 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1278 {Opt_barrier, "barrier"},
1279 {Opt_nobarrier, "nobarrier"},
25ec56b5 1280 {Opt_i_version, "i_version"},
c9de560d 1281 {Opt_stripe, "stripe=%u"},
64769240 1282 {Opt_delalloc, "delalloc"},
dd919b98 1283 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1284 {Opt_mblk_io_submit, "mblk_io_submit"},
1285 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1286 {Opt_block_validity, "block_validity"},
1287 {Opt_noblock_validity, "noblock_validity"},
240799cd 1288 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1289 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1290 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1291 {Opt_auto_da_alloc, "auto_da_alloc"},
1292 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1293 {Opt_dioread_nolock, "dioread_nolock"},
1294 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1295 {Opt_discard, "discard"},
1296 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1297 {Opt_init_itable, "init_itable=%u"},
1298 {Opt_init_itable, "init_itable"},
1299 {Opt_noinit_itable, "noinit_itable"},
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},
03010a33 1450#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1451 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1452 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1453#else
26092bf5
TT		 1454 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1455 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1456#endif
03010a33 1457#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1458 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1459 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1460#else
26092bf5
TT		 1461 {Opt_acl, 0, MOPT_NOSUPPORT},
1462 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1463#endif
26092bf5
TT		 1464 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1465 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1466 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1467 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1468 MOPT_SET | MOPT_Q},
1469 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1470 MOPT_SET | MOPT_Q},
1471 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1472 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1473 {Opt_usrjquota, 0, MOPT_Q},
1474 {Opt_grpjquota, 0, MOPT_Q},
1475 {Opt_offusrjquota, 0, MOPT_Q},
1476 {Opt_offgrpjquota, 0, MOPT_Q},
1477 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1478 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1479 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1480 {Opt_err, 0, 0}
1481};
1482
1483static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1484 substring_t *args, unsigned long *journal_devnum,
1485 unsigned int *journal_ioprio, int is_remount)
1486{
1487 struct ext4_sb_info *sbi = EXT4_SB(sb);
1488 const struct mount_opts *m;
08cefc7a
EB		 1489 kuid_t uid;
1490 kgid_t gid;
26092bf5
TT		 1491 int arg = 0;
1492
57f73c2c
TT		 1493#ifdef CONFIG_QUOTA
1494 if (token == Opt_usrjquota)
1495 return set_qf_name(sb, USRQUOTA, &args[0]);
1496 else if (token == Opt_grpjquota)
1497 return set_qf_name(sb, GRPQUOTA, &args[0]);
1498 else if (token == Opt_offusrjquota)
1499 return clear_qf_name(sb, USRQUOTA);
1500 else if (token == Opt_offgrpjquota)
1501 return clear_qf_name(sb, GRPQUOTA);
1502#endif
26092bf5
TT		 1503 if (args->from && match_int(args, &arg))
1504 return -1;
1505 switch (token) {
f7048605
TT		 1506 case Opt_noacl:
1507 case Opt_nouser_xattr:
1508 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1509 break;
26092bf5
TT		 1510 case Opt_sb:
1511 return 1; /* handled by get_sb_block() */
1512 case Opt_removed:
1513 ext4_msg(sb, KERN_WARNING,
1514 "Ignoring removed %s option", opt);
1515 return 1;
1516 case Opt_resuid:
08cefc7a
EB		 1517 uid = make_kuid(current_user_ns(), arg);
1518 if (!uid_valid(uid)) {
1519 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1520 return -1;
1521 }
1522 sbi->s_resuid = uid;
26092bf5
TT		 1523 return 1;
1524 case Opt_resgid:
08cefc7a
EB		 1525 gid = make_kgid(current_user_ns(), arg);
1526 if (!gid_valid(gid)) {
1527 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1528 return -1;
1529 }
1530 sbi->s_resgid = gid;
26092bf5
TT		 1531 return 1;
1532 case Opt_abort:
1533 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1534 return 1;
1535 case Opt_i_version:
1536 sb->s_flags |= MS_I_VERSION;
1537 return 1;
1538 case Opt_journal_dev:
1539 if (is_remount) {
1540 ext4_msg(sb, KERN_ERR,
1541 "Cannot specify journal on remount");
1542 return -1;
1543 }
1544 *journal_devnum = arg;
1545 return 1;
1546 case Opt_journal_ioprio:
1547 if (arg < 0 || arg > 7)
1548 return -1;
1549 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1550 return 1;
1551 }
1552
1553 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1554 if (token != m->token)
1555 continue;
1556 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1557 return -1;
1558 if (m->flags & MOPT_EXPLICIT)
1559 set_opt2(sb, EXPLICIT_DELALLOC);
1560 if (m->flags & MOPT_CLEAR_ERR)
1561 clear_opt(sb, ERRORS_MASK);
1562 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1563 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1564 "options when quota turned on");
1565 return -1;
1566 }
1567
1568 if (m->flags & MOPT_NOSUPPORT) {
1569 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1570 } else if (token == Opt_commit) {
1571 if (arg == 0)
1572 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1573 sbi->s_commit_interval = HZ * arg;
1574 } else if (token == Opt_max_batch_time) {
1575 if (arg == 0)
1576 arg = EXT4_DEF_MAX_BATCH_TIME;
1577 sbi->s_max_batch_time = arg;
1578 } else if (token == Opt_min_batch_time) {
1579 sbi->s_min_batch_time = arg;
1580 } else if (token == Opt_inode_readahead_blks) {
1581 if (arg > (1 << 30))
1582 return -1;
1583 if (arg && !is_power_of_2(arg)) {
b31e1552 1584 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1585 "EXT4-fs: inode_readahead_blks"
1586 " must be a power of 2");
1587 return -1;
ac27a0ec 1588 }
26092bf5
TT		 1589 sbi->s_inode_readahead_blks = arg;
1590 } else if (token == Opt_init_itable) {
1591 set_opt(sb, INIT_INODE_TABLE);
1592 if (!args->from)
1593 arg = EXT4_DEF_LI_WAIT_MULT;
1594 sbi->s_li_wait_mult = arg;
1595 } else if (token == Opt_stripe) {
1596 sbi->s_stripe = arg;
1597 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1598 if (is_remount) {
eb513689
TT		 1599 if (!sbi->s_journal)
1600 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1601 else if (test_opt(sb, DATA_FLAGS) !=
1602 m->mount_opt) {
b31e1552 1603 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1604 "Cannot change data mode on remount");
1605 return -1;
ac27a0ec
DK		 1606 }
1607 } else {
fd8c37ec 1608 clear_opt(sb, DATA_FLAGS);
26092bf5 1609 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1610 }
ac27a0ec 1611#ifdef CONFIG_QUOTA
26092bf5 1612 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1613 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1614 sbi->s_jquota_fmt != m->mount_opt) {
1615 ext4_msg(sb, KERN_ERR, "Cannot "
1616 "change journaled quota options "
1617 "when quota turned on");
1618 return -1;
ac27a0ec 1619 }
26092bf5 1620 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1621#endif
26092bf5
TT		 1622 } else {
1623 if (!args->from)
1624 arg = 1;
1625 if (m->flags & MOPT_CLEAR)
1626 arg = !arg;
1627 else if (unlikely(!(m->flags & MOPT_SET))) {
1628 ext4_msg(sb, KERN_WARNING,
1629 "buggy handling of option %s", opt);
1630 WARN_ON(1);
1631 return -1;
3197ebdb 1632 }
26092bf5
TT		 1633 if (arg != 0)
1634 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1635 else
26092bf5 1636 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1637 }
26092bf5
TT		 1638 return 1;
1639 }
1640 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1641 "or missing value", opt);
1642 return -1;
1643}
1644
1645static int parse_options(char *options, struct super_block *sb,
1646 unsigned long *journal_devnum,
1647 unsigned int *journal_ioprio,
1648 int is_remount)
1649{
db7e5c66 1650#ifdef CONFIG_QUOTA
26092bf5 1651 struct ext4_sb_info *sbi = EXT4_SB(sb);
db7e5c66 1652#endif
26092bf5
TT		 1653 char *p;
1654 substring_t args[MAX_OPT_ARGS];
1655 int token;
1656
1657 if (!options)
1658 return 1;
1659
1660 while ((p = strsep(&options, ",")) != NULL) {
1661 if (!*p)
1662 continue;
1663 /*
1664 * Initialize args struct so we know whether arg was
1665 * found; some options take optional arguments.
1666 */
1667 args[0].to = args[0].from = 0;
1668 token = match_token(p, tokens, args);
1669 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1670 journal_ioprio, is_remount) < 0)
1671 return 0;
ac27a0ec
DK		 1672 }
1673#ifdef CONFIG_QUOTA
1674 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1675 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1676 clear_opt(sb, USRQUOTA);
ac27a0ec 1677
482a7425 1678 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1679 clear_opt(sb, GRPQUOTA);
ac27a0ec 1680
56c50f11 1681 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1682 ext4_msg(sb, KERN_ERR, "old and new quota "
1683 "format mixing");
ac27a0ec
DK		 1684 return 0;
1685 }
1686
1687 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1688 ext4_msg(sb, KERN_ERR, "journaled quota format "
1689 "not specified");
ac27a0ec
DK		 1690 return 0;
1691 }
1692 } else {
1693 if (sbi->s_jquota_fmt) {
b31e1552 1694 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1695 "specified with no journaling "
b31e1552 1696 "enabled");
ac27a0ec
DK		 1697 return 0;
1698 }
1699 }
1700#endif
1701 return 1;
1702}
1703
2adf6da8
TT		 1704static inline void ext4_show_quota_options(struct seq_file *seq,
1705 struct super_block *sb)
1706{
1707#if defined(CONFIG_QUOTA)
1708 struct ext4_sb_info *sbi = EXT4_SB(sb);
1709
1710 if (sbi->s_jquota_fmt) {
1711 char *fmtname = "";
1712
1713 switch (sbi->s_jquota_fmt) {
1714 case QFMT_VFS_OLD:
1715 fmtname = "vfsold";
1716 break;
1717 case QFMT_VFS_V0:
1718 fmtname = "vfsv0";
1719 break;
1720 case QFMT_VFS_V1:
1721 fmtname = "vfsv1";
1722 break;
1723 }
1724 seq_printf(seq, ",jqfmt=%s", fmtname);
1725 }
1726
1727 if (sbi->s_qf_names[USRQUOTA])
1728 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1729
1730 if (sbi->s_qf_names[GRPQUOTA])
1731 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1732
1733 if (test_opt(sb, USRQUOTA))
1734 seq_puts(seq, ",usrquota");
1735
1736 if (test_opt(sb, GRPQUOTA))
1737 seq_puts(seq, ",grpquota");
1738#endif
1739}
1740
5a916be1
TT		 1741static const char *token2str(int token)
1742{
1743 static const struct match_token *t;
1744
1745 for (t = tokens; t->token != Opt_err; t++)
1746 if (t->token == token && !strchr(t->pattern, '='))
1747 break;
1748 return t->pattern;
1749}
1750
2adf6da8
TT		 1751/*
1752 * Show an option if
1753 * - it's set to a non-default value OR
1754 * - if the per-sb default is different from the global default
1755 */
66acdcf4
TT		 1756static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1757 int nodefs)
2adf6da8 1758{
2adf6da8
TT		 1759 struct ext4_sb_info *sbi = EXT4_SB(sb);
1760 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1761 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1762 const struct mount_opts *m;
66acdcf4 1763 char sep = nodefs ? '\n' : ',';
2adf6da8 1764
66acdcf4
TT		 1765#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1766#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1767
1768 if (sbi->s_sb_block != 1)
5a916be1
TT		 1769 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1770
1771 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1772 int want_set = m->flags & MOPT_SET;
1773 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1774 (m->flags & MOPT_CLEAR_ERR))
1775 continue;
66acdcf4 1776 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1777 continue; /* skip if same as the default */
1778 if ((want_set &&
1779 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1780 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1781 continue; /* select Opt_noFoo vs Opt_Foo */
1782 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1783 }
5a916be1 1784
08cefc7a 1785 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1786 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1787 SEQ_OPTS_PRINT("resuid=%u",
1788 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1789 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1790 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1791 SEQ_OPTS_PRINT("resgid=%u",
1792 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1793 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1794 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1795 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1796 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1797 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1798 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1799 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1800 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1801 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1802 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1803 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1804 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1805 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1806 if (sb->s_flags & MS_I_VERSION)
5a916be1 1807 SEQ_OPTS_PUTS("i_version");
66acdcf4 1808 if (nodefs || sbi->s_stripe)
5a916be1 1809 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1810 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1811 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1812 SEQ_OPTS_PUTS("data=journal");
1813 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1814 SEQ_OPTS_PUTS("data=ordered");
1815 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1816 SEQ_OPTS_PUTS("data=writeback");
1817 }
66acdcf4
TT		 1818 if (nodefs ||
1819 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1820 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1821 sbi->s_inode_readahead_blks);
2adf6da8 1822
66acdcf4
TT		 1823 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1824 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1825 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2adf6da8
TT		 1826
1827 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1828 return 0;
1829}
1830
66acdcf4
TT		 1831static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1832{
1833 return _ext4_show_options(seq, root->d_sb, 0);
1834}
1835
1836static int options_seq_show(struct seq_file *seq, void *offset)
1837{
1838 struct super_block *sb = seq->private;
1839 int rc;
1840
1841 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1842 rc = _ext4_show_options(seq, sb, 1);
1843 seq_puts(seq, "\n");
1844 return rc;
1845}
1846
1847static int options_open_fs(struct inode *inode, struct file *file)
1848{
1849 return single_open(file, options_seq_show, PDE(inode)->data);
1850}
1851
1852static const struct file_operations ext4_seq_options_fops = {
1853 .owner = THIS_MODULE,
1854 .open = options_open_fs,
1855 .read = seq_read,
1856 .llseek = seq_lseek,
1857 .release = single_release,
1858};
1859
617ba13b 1860static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1861 int read_only)
1862{
617ba13b 1863 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1864 int res = 0;
1865
617ba13b 1866 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1867 ext4_msg(sb, KERN_ERR, "revision level too high, "
1868 "forcing read-only mode");
ac27a0ec
DK		 1869 res = MS_RDONLY;
1870 }
1871 if (read_only)
281b5995 1872 goto done;
617ba13b 1873 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1874 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1875 "running e2fsck is recommended");
617ba13b 1876 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1877 ext4_msg(sb, KERN_WARNING,
1878 "warning: mounting fs with errors, "
1879 "running e2fsck is recommended");
ed3ce80a 1880 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1881 le16_to_cpu(es->s_mnt_count) >=
1882 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1883 ext4_msg(sb, KERN_WARNING,
1884 "warning: maximal mount count reached, "
1885 "running e2fsck is recommended");
ac27a0ec
DK		 1886 else if (le32_to_cpu(es->s_checkinterval) &&
1887 (le32_to_cpu(es->s_lastcheck) +
1888 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1889 ext4_msg(sb, KERN_WARNING,
1890 "warning: checktime reached, "
1891 "running e2fsck is recommended");
0b8e58a1 1892 if (!sbi->s_journal)
0390131b 1893 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1894 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1895 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1896 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1897 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1898 ext4_update_dynamic_rev(sb);
0390131b
FM		 1899 if (sbi->s_journal)
1900 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1901
e2d67052 1902 ext4_commit_super(sb, 1);
281b5995 1903done:
ac27a0ec 1904 if (test_opt(sb, DEBUG))
a9df9a49 1905 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1906 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1907 sb->s_blocksize,
1908 sbi->s_groups_count,
617ba13b
MC		 1909 EXT4_BLOCKS_PER_GROUP(sb),
1910 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1911 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1912
7abc52c2 1913 cleancache_init_fs(sb);
ac27a0ec
DK		 1914 return res;
1915}
1916
772cb7c8
JS		 1917static int ext4_fill_flex_info(struct super_block *sb)
1918{
1919 struct ext4_sb_info *sbi = EXT4_SB(sb);
1920 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1921 ext4_group_t flex_group_count;
1922 ext4_group_t flex_group;
d50f2ab6 1923 unsigned int groups_per_flex = 0;
c5ca7c76 1924 size_t size;
772cb7c8
JS		 1925 int i;
1926
503358ae 1927 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1928 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1929 sbi->s_log_groups_per_flex = 0;
1930 return 1;
1931 }
d50f2ab6 1932 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1933
c62a11fd
FB		 1934 /* We allocate both existing and potentially added groups */
1935 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1936 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1937 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1938 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1939 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1940 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1941 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1942 flex_group_count);
1943 goto failed;
772cb7c8 1944 }
772cb7c8 1945
772cb7c8 1946 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1947 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1948
1949 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1950 atomic_add(ext4_free_inodes_count(sb, gdp),
1951 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1952 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1953 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1954 atomic_add(ext4_used_dirs_count(sb, gdp),
1955 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1956 }
1957
1958 return 1;
1959failed:
1960 return 0;
1961}
1962
feb0ab32
DW		 1963static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1964 struct ext4_group_desc *gdp)
717d50e4 1965{
feb0ab32 1966 int offset;
717d50e4 1967 __u16 crc = 0;
feb0ab32 1968 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1969
feb0ab32
DW		 1970 if ((sbi->s_es->s_feature_ro_compat &
1971 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1972 /* Use new metadata_csum algorithm */
1973 __u16 old_csum;
1974 __u32 csum32;
1975
1976 old_csum = gdp->bg_checksum;
1977 gdp->bg_checksum = 0;
1978 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1979 sizeof(le_group));
1980 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1981 sbi->s_desc_size);
1982 gdp->bg_checksum = old_csum;
1983
1984 crc = csum32 & 0xFFFF;
1985 goto out;
717d50e4
AD		 1986 }
1987
feb0ab32
DW		 1988 /* old crc16 code */
1989 offset = offsetof(struct ext4_group_desc, bg_checksum);
1990
1991 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1992 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1993 crc = crc16(crc, (__u8 *)gdp, offset);
1994 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1995 /* for checksum of struct ext4_group_desc do the rest...*/
1996 if ((sbi->s_es->s_feature_incompat &
1997 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1998 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1999 crc = crc16(crc, (__u8 *)gdp + offset,
2000 le16_to_cpu(sbi->s_es->s_desc_size) -
2001 offset);
2002
2003out:
717d50e4
AD		 2004 return cpu_to_le16(crc);
2005}
2006
feb0ab32 2007int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2008 struct ext4_group_desc *gdp)
2009{
feb0ab32
DW		 2010 if (ext4_has_group_desc_csum(sb) &&
2011 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2012 block_group, gdp)))
717d50e4
AD		 2013 return 0;
2014
2015 return 1;
2016}
2017
feb0ab32
DW		 2018void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2019 struct ext4_group_desc *gdp)
2020{
2021 if (!ext4_has_group_desc_csum(sb))
2022 return;
2023 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2024}
2025
ac27a0ec 2026/* Called at mount-time, super-block is locked */
bfff6873
LC		 2027static int ext4_check_descriptors(struct super_block *sb,
2028 ext4_group_t *first_not_zeroed)
ac27a0ec 2029{
617ba13b
MC		 2030 struct ext4_sb_info *sbi = EXT4_SB(sb);
2031 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2032 ext4_fsblk_t last_block;
bd81d8ee
LV		 2033 ext4_fsblk_t block_bitmap;
2034 ext4_fsblk_t inode_bitmap;
2035 ext4_fsblk_t inode_table;
ce421581 2036 int flexbg_flag = 0;
bfff6873 2037 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2038
ce421581
JS		 2039 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2040 flexbg_flag = 1;
2041
af5bc92d 2042 ext4_debug("Checking group descriptors");
ac27a0ec 2043
197cd65a
AM		 2044 for (i = 0; i < sbi->s_groups_count; i++) {
2045 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2046
ce421581 2047 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2048 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2049 else
2050 last_block = first_block +
617ba13b 2051 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2052
bfff6873
LC		 2053 if ((grp == sbi->s_groups_count) &&
2054 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2055 grp = i;
2056
8fadc143 2057 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2058 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2059 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2060 "Block bitmap for group %u not in group "
b31e1552 2061 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2062 return 0;
2063 }
8fadc143 2064 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2065 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2066 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2067 "Inode bitmap for group %u not in group "
b31e1552 2068 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2069 return 0;
2070 }
8fadc143 2071 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2072 if (inode_table < first_block ||
2b2d6d01 2073 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2074 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2075 "Inode table for group %u not in group "
b31e1552 2076 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2077 return 0;
2078 }
955ce5f5 2079 ext4_lock_group(sb, i);
feb0ab32 2080 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2081 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2082 "Checksum for group %u failed (%u!=%u)",
2083 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2084 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2085 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2086 ext4_unlock_group(sb, i);
8a266467 2087 return 0;
7ee1ec4c 2088 }
717d50e4 2089 }
955ce5f5 2090 ext4_unlock_group(sb, i);
ce421581
JS		 2091 if (!flexbg_flag)
2092 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2093 }
bfff6873
LC		 2094 if (NULL != first_not_zeroed)
2095 *first_not_zeroed = grp;
ac27a0ec 2096
5dee5437
TT		 2097 ext4_free_blocks_count_set(sbi->s_es,
2098 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2099 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2100 return 1;
2101}
2102
617ba13b 2103/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2104 * the superblock) which were deleted from all directories, but held open by
2105 * a process at the time of a crash. We walk the list and try to delete these
2106 * inodes at recovery time (only with a read-write filesystem).
2107 *
2108 * In order to keep the orphan inode chain consistent during traversal (in
2109 * case of crash during recovery), we link each inode into the superblock
2110 * orphan list_head and handle it the same way as an inode deletion during
2111 * normal operation (which journals the operations for us).
2112 *
2113 * We only do an iget() and an iput() on each inode, which is very safe if we
2114 * accidentally point at an in-use or already deleted inode. The worst that
2115 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2116 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2117 * e2fsck was run on this filesystem, and it must have already done the orphan
2118 * inode cleanup for us, so we can safely abort without any further action.
2119 */
2b2d6d01
TT		 2120static void ext4_orphan_cleanup(struct super_block *sb,
2121 struct ext4_super_block *es)
ac27a0ec
DK		 2122{
2123 unsigned int s_flags = sb->s_flags;
2124 int nr_orphans = 0, nr_truncates = 0;
2125#ifdef CONFIG_QUOTA
2126 int i;
2127#endif
2128 if (!es->s_last_orphan) {
2129 jbd_debug(4, "no orphan inodes to clean up\n");
2130 return;
2131 }
2132
a8f48a95 2133 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2134 ext4_msg(sb, KERN_ERR, "write access "
2135 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2136 return;
2137 }
2138
d39195c3
AG		 2139 /* Check if feature set would not allow a r/w mount */
2140 if (!ext4_feature_set_ok(sb, 0)) {
2141 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2142 "unknown ROCOMPAT features");
2143 return;
2144 }
2145
617ba13b 2146 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2147 if (es->s_last_orphan)
2148 jbd_debug(1, "Errors on filesystem, "
2149 "clearing orphan list.\n");
2150 es->s_last_orphan = 0;
2151 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2152 return;
2153 }
2154
2155 if (s_flags & MS_RDONLY) {
b31e1552 2156 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2157 sb->s_flags &= ~MS_RDONLY;
2158 }
2159#ifdef CONFIG_QUOTA
2160 /* Needed for iput() to work correctly and not trash data */
2161 sb->s_flags |= MS_ACTIVE;
2162 /* Turn on quotas so that they are updated correctly */
2163 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2164 if (EXT4_SB(sb)->s_qf_names[i]) {
2165 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2166 if (ret < 0)
b31e1552
ES		 2167 ext4_msg(sb, KERN_ERR,
2168 "Cannot turn on journaled "
2169 "quota: error %d", ret);
ac27a0ec
DK		 2170 }
2171 }
2172#endif
2173
2174 while (es->s_last_orphan) {
2175 struct inode *inode;
2176
97bd42b9
JB		 2177 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2178 if (IS_ERR(inode)) {
ac27a0ec
DK		 2179 es->s_last_orphan = 0;
2180 break;
2181 }
2182
617ba13b 2183 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2184 dquot_initialize(inode);
ac27a0ec 2185 if (inode->i_nlink) {
b31e1552
ES		 2186 ext4_msg(sb, KERN_DEBUG,
2187 "%s: truncating inode %lu to %lld bytes",
46e665e9 2188 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2189 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2190 inode->i_ino, inode->i_size);
617ba13b 2191 ext4_truncate(inode);
ac27a0ec
DK		 2192 nr_truncates++;
2193 } else {
b31e1552
ES		 2194 ext4_msg(sb, KERN_DEBUG,
2195 "%s: deleting unreferenced inode %lu",
46e665e9 2196 __func__, inode->i_ino);
ac27a0ec
DK		 2197 jbd_debug(2, "deleting unreferenced inode %lu\n",
2198 inode->i_ino);
2199 nr_orphans++;
2200 }
2201 iput(inode); /* The delete magic happens here! */
2202 }
2203
2b2d6d01 2204#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2205
2206 if (nr_orphans)
b31e1552
ES		 2207 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2208 PLURAL(nr_orphans));
ac27a0ec 2209 if (nr_truncates)
b31e1552
ES		 2210 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2211 PLURAL(nr_truncates));
ac27a0ec
DK		 2212#ifdef CONFIG_QUOTA
2213 /* Turn quotas off */
2214 for (i = 0; i < MAXQUOTAS; i++) {
2215 if (sb_dqopt(sb)->files[i])
287a8095 2216 dquot_quota_off(sb, i);
ac27a0ec
DK		 2217 }
2218#endif
2219 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2220}
0b8e58a1 2221
cd2291a4
ES		 2222/*
2223 * Maximal extent format file size.
2224 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2225 * extent format containers, within a sector_t, and within i_blocks
2226 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2227 * so that won't be a limiting factor.
2228 *
f17722f9
LC		 2229 * However there is other limiting factor. We do store extents in the form
2230 * of starting block and length, hence the resulting length of the extent
2231 * covering maximum file size must fit into on-disk format containers as
2232 * well. Given that length is always by 1 unit bigger than max unit (because
2233 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2234 *
cd2291a4
ES		 2235 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2236 */
f287a1a5 2237static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2238{
2239 loff_t res;
2240 loff_t upper_limit = MAX_LFS_FILESIZE;
2241
2242 /* small i_blocks in vfs inode? */
f287a1a5 2243 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2244 /*
90c699a9 2245 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2246 * i_block represent total blocks in 512 bytes
2247 * 32 == size of vfs inode i_blocks * 8
2248 */
2249 upper_limit = (1LL << 32) - 1;
2250
2251 /* total blocks in file system block size */
2252 upper_limit >>= (blkbits - 9);
2253 upper_limit <<= blkbits;
2254 }
2255
f17722f9
LC		 2256 /*
2257 * 32-bit extent-start container, ee_block. We lower the maxbytes
2258 * by one fs block, so ee_len can cover the extent of maximum file
2259 * size
2260 */
2261 res = (1LL << 32) - 1;
cd2291a4 2262 res <<= blkbits;
cd2291a4
ES		 2263
2264 /* Sanity check against vm- & vfs- imposed limits */
2265 if (res > upper_limit)
2266 res = upper_limit;
2267
2268 return res;
2269}
ac27a0ec 2270
ac27a0ec 2271/*
cd2291a4 2272 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2273 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2274 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2275 */
f287a1a5 2276static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2277{
617ba13b 2278 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2279 int meta_blocks;
2280 loff_t upper_limit;
0b8e58a1
AD		 2281 /* This is calculated to be the largest file size for a dense, block
2282 * mapped file such that the file's total number of 512-byte sectors,
2283 * including data and all indirect blocks, does not exceed (2^48 - 1).
2284 *
2285 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2286 * number of 512-byte sectors of the file.
0fc1b451
AK		 2287 */
2288
f287a1a5 2289 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2290 /*
90c699a9 2291 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2292 * the inode i_block field represents total file blocks in
2293 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2294 */
2295 upper_limit = (1LL << 32) - 1;
2296
2297 /* total blocks in file system block size */
2298 upper_limit >>= (bits - 9);
2299
2300 } else {
8180a562
AK		 2301 /*
2302 * We use 48 bit ext4_inode i_blocks
2303 * With EXT4_HUGE_FILE_FL set the i_blocks
2304 * represent total number of blocks in
2305 * file system block size
2306 */
0fc1b451
AK		 2307 upper_limit = (1LL << 48) - 1;
2308
0fc1b451
AK		 2309 }
2310
2311 /* indirect blocks */
2312 meta_blocks = 1;
2313 /* double indirect blocks */
2314 meta_blocks += 1 + (1LL << (bits-2));
2315 /* tripple indirect blocks */
2316 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2317
2318 upper_limit -= meta_blocks;
2319 upper_limit <<= bits;
ac27a0ec
DK		 2320
2321 res += 1LL << (bits-2);
2322 res += 1LL << (2*(bits-2));
2323 res += 1LL << (3*(bits-2));
2324 res <<= bits;
2325 if (res > upper_limit)
2326 res = upper_limit;
0fc1b451
AK		 2327
2328 if (res > MAX_LFS_FILESIZE)
2329 res = MAX_LFS_FILESIZE;
2330
ac27a0ec
DK		 2331 return res;
2332}
2333
617ba13b 2334static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2335 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2336{
617ba13b 2337 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2338 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2339 int has_super = 0;
2340
2341 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2342
617ba13b 2343 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2344 nr < first_meta_bg)
70bbb3e0 2345 return logical_sb_block + nr + 1;
ac27a0ec 2346 bg = sbi->s_desc_per_block * nr;
617ba13b 2347 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2348 has_super = 1;
0b8e58a1 2349
617ba13b 2350 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2351}
2352
c9de560d
AT		 2353/**
2354 * ext4_get_stripe_size: Get the stripe size.
2355 * @sbi: In memory super block info
2356 *
2357 * If we have specified it via mount option, then
2358 * use the mount option value. If the value specified at mount time is
2359 * greater than the blocks per group use the super block value.
2360 * If the super block value is greater than blocks per group return 0.
2361 * Allocator needs it be less than blocks per group.
2362 *
2363 */
2364static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2365{
2366 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2367 unsigned long stripe_width =
2368 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2369 int ret;
c9de560d
AT		 2370
2371 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2372 ret = sbi->s_stripe;
2373 else if (stripe_width <= sbi->s_blocks_per_group)
2374 ret = stripe_width;
2375 else if (stride <= sbi->s_blocks_per_group)
2376 ret = stride;
2377 else
2378 ret = 0;
c9de560d 2379
3eb08658
DE		 2380 /*
2381 * If the stripe width is 1, this makes no sense and
2382 * we set it to 0 to turn off stripe handling code.
2383 */
2384 if (ret <= 1)
2385 ret = 0;
c9de560d 2386
3eb08658 2387 return ret;
c9de560d 2388}
ac27a0ec 2389
3197ebdb
TT		 2390/* sysfs supprt */
2391
2392struct ext4_attr {
2393 struct attribute attr;
2394 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2395 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2396 const char *, size_t);
2397 int offset;
2398};
2399
2400static int parse_strtoul(const char *buf,
2401 unsigned long max, unsigned long *value)
2402{
2403 char *endp;
2404
e7d2860b
AGR		 2405 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2406 endp = skip_spaces(endp);
3197ebdb
TT		 2407 if (*endp || *value > max)
2408 return -EINVAL;
2409
2410 return 0;
2411}
2412
2413static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2414 struct ext4_sb_info *sbi,
2415 char *buf)
2416{
2417 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2418 (s64) EXT4_C2B(sbi,
2419 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2420}
2421
2422static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2423 struct ext4_sb_info *sbi, char *buf)
2424{
2425 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2426
f613dfcb
TT		 2427 if (!sb->s_bdev->bd_part)
2428 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2429 return snprintf(buf, PAGE_SIZE, "%lu\n",
2430 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2431 sbi->s_sectors_written_start) >> 1);
2432}
2433
2434static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2435 struct ext4_sb_info *sbi, char *buf)
2436{
2437 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2438
f613dfcb
TT		 2439 if (!sb->s_bdev->bd_part)
2440 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2441 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2442 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2443 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2444 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2445}
2446
2447static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2448 struct ext4_sb_info *sbi,
2449 const char *buf, size_t count)
2450{
2451 unsigned long t;
2452
2453 if (parse_strtoul(buf, 0x40000000, &t))
2454 return -EINVAL;
2455
5dbd571d 2456 if (t && !is_power_of_2(t))
3197ebdb
TT		 2457 return -EINVAL;
2458
2459 sbi->s_inode_readahead_blks = t;
2460 return count;
2461}
2462
2463static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2464 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2465{
2466 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2467
2468 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2469}
2470
2471static ssize_t sbi_ui_store(struct ext4_attr *a,
2472 struct ext4_sb_info *sbi,
2473 const char *buf, size_t count)
2474{
2475 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2476 unsigned long t;
2477
2478 if (parse_strtoul(buf, 0xffffffff, &t))
2479 return -EINVAL;
2480 *ui = t;
2481 return count;
2482}
2483
2c0544b2
TT		 2484static ssize_t trigger_test_error(struct ext4_attr *a,
2485 struct ext4_sb_info *sbi,
2486 const char *buf, size_t count)
2487{
2488 int len = count;
2489
2490 if (!capable(CAP_SYS_ADMIN))
2491 return -EPERM;
2492
2493 if (len && buf[len-1] == '\n')
2494 len--;
2495
2496 if (len)
2497 ext4_error(sbi->s_sb, "%.*s", len, buf);
2498 return count;
2499}
2500
3197ebdb
TT		 2501#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2502static struct ext4_attr ext4_attr_##_name = { \
2503 .attr = {.name = __stringify(_name), .mode = _mode }, \
2504 .show = _show, \
2505 .store = _store, \
2506 .offset = offsetof(struct ext4_sb_info, _elname), \
2507}
2508#define EXT4_ATTR(name, mode, show, store) \
2509static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2510
857ac889 2511#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2512#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2513#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2514#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2515 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2516#define ATTR_LIST(name) &ext4_attr_##name.attr
2517
2518EXT4_RO_ATTR(delayed_allocation_blocks);
2519EXT4_RO_ATTR(session_write_kbytes);
2520EXT4_RO_ATTR(lifetime_write_kbytes);
2521EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2522 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2523EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2524EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2525EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2526EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2527EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2528EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2529EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2530EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2c0544b2 2531EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2532
2533static struct attribute *ext4_attrs[] = {
2534 ATTR_LIST(delayed_allocation_blocks),
2535 ATTR_LIST(session_write_kbytes),
2536 ATTR_LIST(lifetime_write_kbytes),
2537 ATTR_LIST(inode_readahead_blks),
11013911 2538 ATTR_LIST(inode_goal),
3197ebdb
TT		 2539 ATTR_LIST(mb_stats),
2540 ATTR_LIST(mb_max_to_scan),
2541 ATTR_LIST(mb_min_to_scan),
2542 ATTR_LIST(mb_order2_req),
2543 ATTR_LIST(mb_stream_req),
2544 ATTR_LIST(mb_group_prealloc),
55138e0b 2545 ATTR_LIST(max_writeback_mb_bump),
2c0544b2 2546 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2547 NULL,
2548};
2549
857ac889
LC		 2550/* Features this copy of ext4 supports */
2551EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2552EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2553
2554static struct attribute *ext4_feat_attrs[] = {
2555 ATTR_LIST(lazy_itable_init),
27ee40df 2556 ATTR_LIST(batched_discard),
857ac889
LC		 2557 NULL,
2558};
2559
3197ebdb
TT		 2560static ssize_t ext4_attr_show(struct kobject *kobj,
2561 struct attribute *attr, char *buf)
2562{
2563 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2564 s_kobj);
2565 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2566
2567 return a->show ? a->show(a, sbi, buf) : 0;
2568}
2569
2570static ssize_t ext4_attr_store(struct kobject *kobj,
2571 struct attribute *attr,
2572 const char *buf, size_t len)
2573{
2574 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2575 s_kobj);
2576 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2577
2578 return a->store ? a->store(a, sbi, buf, len) : 0;
2579}
2580
2581static void ext4_sb_release(struct kobject *kobj)
2582{
2583 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2584 s_kobj);
2585 complete(&sbi->s_kobj_unregister);
2586}
2587
52cf25d0 2588static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2589 .show = ext4_attr_show,
2590 .store = ext4_attr_store,
2591};
2592
2593static struct kobj_type ext4_ktype = {
2594 .default_attrs = ext4_attrs,
2595 .sysfs_ops = &ext4_attr_ops,
2596 .release = ext4_sb_release,
2597};
2598
857ac889
LC		 2599static void ext4_feat_release(struct kobject *kobj)
2600{
2601 complete(&ext4_feat->f_kobj_unregister);
2602}
2603
2604static struct kobj_type ext4_feat_ktype = {
2605 .default_attrs = ext4_feat_attrs,
2606 .sysfs_ops = &ext4_attr_ops,
2607 .release = ext4_feat_release,
2608};
2609
a13fb1a4
ES		 2610/*
2611 * Check whether this filesystem can be mounted based on
2612 * the features present and the RDONLY/RDWR mount requested.
2613 * Returns 1 if this filesystem can be mounted as requested,
2614 * 0 if it cannot be.
2615 */
2616static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2617{
2618 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2619 ext4_msg(sb, KERN_ERR,
2620 "Couldn't mount because of "
2621 "unsupported optional features (%x)",
2622 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2623 ~EXT4_FEATURE_INCOMPAT_SUPP));
2624 return 0;
2625 }
2626
2627 if (readonly)
2628 return 1;
2629
2630 /* Check that feature set is OK for a read-write mount */
2631 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2632 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2633 "unsupported optional features (%x)",
2634 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2635 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2636 return 0;
2637 }
2638 /*
2639 * Large file size enabled file system can only be mounted
2640 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2641 */
2642 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2643 if (sizeof(blkcnt_t) < sizeof(u64)) {
2644 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2645 "cannot be mounted RDWR without "
2646 "CONFIG_LBDAF");
2647 return 0;
2648 }
2649 }
bab08ab9
TT		 2650 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2651 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2652 ext4_msg(sb, KERN_ERR,
2653 "Can't support bigalloc feature without "
2654 "extents feature\n");
2655 return 0;
2656 }
7c319d32
AK		 2657
2658#ifndef CONFIG_QUOTA
2659 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2660 !readonly) {
2661 ext4_msg(sb, KERN_ERR,
2662 "Filesystem with quota feature cannot be mounted RDWR "
2663 "without CONFIG_QUOTA");
2664 return 0;
2665 }
2666#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2667 return 1;
2668}
2669
66e61a9e
TT		 2670/*
2671 * This function is called once a day if we have errors logged
2672 * on the file system
2673 */
2674static void print_daily_error_info(unsigned long arg)
2675{
2676 struct super_block *sb = (struct super_block *) arg;
2677 struct ext4_sb_info *sbi;
2678 struct ext4_super_block *es;
2679
2680 sbi = EXT4_SB(sb);
2681 es = sbi->s_es;
2682
2683 if (es->s_error_count)
2684 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2685 le32_to_cpu(es->s_error_count));
2686 if (es->s_first_error_time) {
2687 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2688 sb->s_id, le32_to_cpu(es->s_first_error_time),
2689 (int) sizeof(es->s_first_error_func),
2690 es->s_first_error_func,
2691 le32_to_cpu(es->s_first_error_line));
2692 if (es->s_first_error_ino)
2693 printk(": inode %u",
2694 le32_to_cpu(es->s_first_error_ino));
2695 if (es->s_first_error_block)
2696 printk(": block %llu", (unsigned long long)
2697 le64_to_cpu(es->s_first_error_block));
2698 printk("\n");
2699 }
2700 if (es->s_last_error_time) {
2701 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2702 sb->s_id, le32_to_cpu(es->s_last_error_time),
2703 (int) sizeof(es->s_last_error_func),
2704 es->s_last_error_func,
2705 le32_to_cpu(es->s_last_error_line));
2706 if (es->s_last_error_ino)
2707 printk(": inode %u",
2708 le32_to_cpu(es->s_last_error_ino));
2709 if (es->s_last_error_block)
2710 printk(": block %llu", (unsigned long long)
2711 le64_to_cpu(es->s_last_error_block));
2712 printk("\n");
2713 }
2714 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2715}
2716
bfff6873
LC		 2717/* Find next suitable group and run ext4_init_inode_table */
2718static int ext4_run_li_request(struct ext4_li_request *elr)
2719{
2720 struct ext4_group_desc *gdp = NULL;
2721 ext4_group_t group, ngroups;
2722 struct super_block *sb;
2723 unsigned long timeout = 0;
2724 int ret = 0;
2725
2726 sb = elr->lr_super;
2727 ngroups = EXT4_SB(sb)->s_groups_count;
2728
8e8ad8a5 2729 sb_start_write(sb);
bfff6873
LC		 2730 for (group = elr->lr_next_group; group < ngroups; group++) {
2731 gdp = ext4_get_group_desc(sb, group, NULL);
2732 if (!gdp) {
2733 ret = 1;
2734 break;
2735 }
2736
2737 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2738 break;
2739 }
2740
2741 if (group == ngroups)
2742 ret = 1;
2743
2744 if (!ret) {
2745 timeout = jiffies;
2746 ret = ext4_init_inode_table(sb, group,
2747 elr->lr_timeout ? 0 : 1);
2748 if (elr->lr_timeout == 0) {
51ce6511
LC		 2749 timeout = (jiffies - timeout) *
2750 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2751 elr->lr_timeout = timeout;
2752 }
2753 elr->lr_next_sched = jiffies + elr->lr_timeout;
2754 elr->lr_next_group = group + 1;
2755 }
8e8ad8a5 2756 sb_end_write(sb);
bfff6873
LC		 2757
2758 return ret;
2759}
2760
2761/*
2762 * Remove lr_request from the list_request and free the
4ed5c033 2763 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2764 */
2765static void ext4_remove_li_request(struct ext4_li_request *elr)
2766{
2767 struct ext4_sb_info *sbi;
2768
2769 if (!elr)
2770 return;
2771
2772 sbi = elr->lr_sbi;
2773
2774 list_del(&elr->lr_request);
2775 sbi->s_li_request = NULL;
2776 kfree(elr);
2777}
2778
2779static void ext4_unregister_li_request(struct super_block *sb)
2780{
1bb933fb
LC		 2781 mutex_lock(&ext4_li_mtx);
2782 if (!ext4_li_info) {
2783 mutex_unlock(&ext4_li_mtx);
bfff6873 2784 return;
1bb933fb 2785 }
bfff6873
LC		 2786
2787 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2788 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2789 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2790 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2791}
2792
8f1f7453
ES		 2793static struct task_struct *ext4_lazyinit_task;
2794
bfff6873
LC		 2795/*
2796 * This is the function where ext4lazyinit thread lives. It walks
2797 * through the request list searching for next scheduled filesystem.
2798 * When such a fs is found, run the lazy initialization request
2799 * (ext4_rn_li_request) and keep track of the time spend in this
2800 * function. Based on that time we compute next schedule time of
2801 * the request. When walking through the list is complete, compute
2802 * next waking time and put itself into sleep.
2803 */
2804static int ext4_lazyinit_thread(void *arg)
2805{
2806 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2807 struct list_head *pos, *n;
2808 struct ext4_li_request *elr;
4ed5c033 2809 unsigned long next_wakeup, cur;
bfff6873
LC		 2810
2811 BUG_ON(NULL == eli);
2812
bfff6873
LC		 2813cont_thread:
2814 while (true) {
2815 next_wakeup = MAX_JIFFY_OFFSET;
2816
2817 mutex_lock(&eli->li_list_mtx);
2818 if (list_empty(&eli->li_request_list)) {
2819 mutex_unlock(&eli->li_list_mtx);
2820 goto exit_thread;
2821 }
2822
2823 list_for_each_safe(pos, n, &eli->li_request_list) {
2824 elr = list_entry(pos, struct ext4_li_request,
2825 lr_request);
2826
b2c78cd0
TT		 2827 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2828 if (ext4_run_li_request(elr) != 0) {
2829 /* error, remove the lazy_init job */
2830 ext4_remove_li_request(elr);
2831 continue;
2832 }
bfff6873
LC		 2833 }
2834
2835 if (time_before(elr->lr_next_sched, next_wakeup))
2836 next_wakeup = elr->lr_next_sched;
2837 }
2838 mutex_unlock(&eli->li_list_mtx);
2839
a0acae0e 2840 try_to_freeze();
bfff6873 2841
4ed5c033
LC		 2842 cur = jiffies;
2843 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2844 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2845 cond_resched();
2846 continue;
2847 }
2848
4ed5c033
LC		 2849 schedule_timeout_interruptible(next_wakeup - cur);
2850
8f1f7453
ES		 2851 if (kthread_should_stop()) {
2852 ext4_clear_request_list();
2853 goto exit_thread;
2854 }
bfff6873
LC		 2855 }
2856
2857exit_thread:
2858 /*
2859 * It looks like the request list is empty, but we need
2860 * to check it under the li_list_mtx lock, to prevent any
2861 * additions into it, and of course we should lock ext4_li_mtx
2862 * to atomically free the list and ext4_li_info, because at
2863 * this point another ext4 filesystem could be registering
2864 * new one.
2865 */
2866 mutex_lock(&ext4_li_mtx);
2867 mutex_lock(&eli->li_list_mtx);
2868 if (!list_empty(&eli->li_request_list)) {
2869 mutex_unlock(&eli->li_list_mtx);
2870 mutex_unlock(&ext4_li_mtx);
2871 goto cont_thread;
2872 }
2873 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2874 kfree(ext4_li_info);
2875 ext4_li_info = NULL;
2876 mutex_unlock(&ext4_li_mtx);
2877
2878 return 0;
2879}
2880
2881static void ext4_clear_request_list(void)
2882{
2883 struct list_head *pos, *n;
2884 struct ext4_li_request *elr;
2885
2886 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2887 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2888 elr = list_entry(pos, struct ext4_li_request,
2889 lr_request);
2890 ext4_remove_li_request(elr);
2891 }
2892 mutex_unlock(&ext4_li_info->li_list_mtx);
2893}
2894
2895static int ext4_run_lazyinit_thread(void)
2896{
8f1f7453
ES		 2897 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2898 ext4_li_info, "ext4lazyinit");
2899 if (IS_ERR(ext4_lazyinit_task)) {
2900 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2901 ext4_clear_request_list();
bfff6873
LC		 2902 kfree(ext4_li_info);
2903 ext4_li_info = NULL;
92b97816 2904 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2905 "initialization thread\n",
2906 err);
2907 return err;
2908 }
2909 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2910 return 0;
2911}
2912
2913/*
2914 * Check whether it make sense to run itable init. thread or not.
2915 * If there is at least one uninitialized inode table, return
2916 * corresponding group number, else the loop goes through all
2917 * groups and return total number of groups.
2918 */
2919static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2920{
2921 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2922 struct ext4_group_desc *gdp = NULL;
2923
2924 for (group = 0; group < ngroups; group++) {
2925 gdp = ext4_get_group_desc(sb, group, NULL);
2926 if (!gdp)
2927 continue;
2928
2929 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2930 break;
2931 }
2932
2933 return group;
2934}
2935
2936static int ext4_li_info_new(void)
2937{
2938 struct ext4_lazy_init *eli = NULL;
2939
2940 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2941 if (!eli)
2942 return -ENOMEM;
2943
bfff6873
LC		 2944 INIT_LIST_HEAD(&eli->li_request_list);
2945 mutex_init(&eli->li_list_mtx);
2946
bfff6873
LC		 2947 eli->li_state |= EXT4_LAZYINIT_QUIT;
2948
2949 ext4_li_info = eli;
2950
2951 return 0;
2952}
2953
2954static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2955 ext4_group_t start)
2956{
2957 struct ext4_sb_info *sbi = EXT4_SB(sb);
2958 struct ext4_li_request *elr;
2959 unsigned long rnd;
2960
2961 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2962 if (!elr)
2963 return NULL;
2964
2965 elr->lr_super = sb;
2966 elr->lr_sbi = sbi;
2967 elr->lr_next_group = start;
2968
2969 /*
2970 * Randomize first schedule time of the request to
2971 * spread the inode table initialization requests
2972 * better.
2973 */
2974 get_random_bytes(&rnd, sizeof(rnd));
2975 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2976 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2977
2978 return elr;
2979}
2980
2981static int ext4_register_li_request(struct super_block *sb,
2982 ext4_group_t first_not_zeroed)
2983{
2984 struct ext4_sb_info *sbi = EXT4_SB(sb);
2985 struct ext4_li_request *elr;
2986 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2987 int ret = 0;
bfff6873 2988
51ce6511
LC		 2989 if (sbi->s_li_request != NULL) {
2990 /*
2991 * Reset timeout so it can be computed again, because
2992 * s_li_wait_mult might have changed.
2993 */
2994 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2995 return 0;
51ce6511 2996 }
bfff6873
LC		 2997
2998 if (first_not_zeroed == ngroups ||
2999 (sb->s_flags & MS_RDONLY) ||
55ff3840 3000 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 3001 return 0;
bfff6873
LC		 3002
3003 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 3004 if (!elr)
3005 return -ENOMEM;
bfff6873
LC		 3006
3007 mutex_lock(&ext4_li_mtx);
3008
3009 if (NULL == ext4_li_info) {
3010 ret = ext4_li_info_new();
3011 if (ret)
3012 goto out;
3013 }
3014
3015 mutex_lock(&ext4_li_info->li_list_mtx);
3016 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3017 mutex_unlock(&ext4_li_info->li_list_mtx);
3018
3019 sbi->s_li_request = elr;
46e4690b
TM		 3020 /*
3021 * set elr to NULL here since it has been inserted to
3022 * the request_list and the removal and free of it is
3023 * handled by ext4_clear_request_list from now on.
3024 */
3025 elr = NULL;
bfff6873
LC		 3026
3027 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3028 ret = ext4_run_lazyinit_thread();
3029 if (ret)
3030 goto out;
3031 }
bfff6873 3032out:
beed5ecb
NK		 3033 mutex_unlock(&ext4_li_mtx);
3034 if (ret)
bfff6873 3035 kfree(elr);
bfff6873
LC		 3036 return ret;
3037}
3038
3039/*
3040 * We do not need to lock anything since this is called on
3041 * module unload.
3042 */
3043static void ext4_destroy_lazyinit_thread(void)
3044{
3045 /*
3046 * If thread exited earlier
3047 * there's nothing to be done.
3048 */
8f1f7453 3049 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3050 return;
3051
8f1f7453 3052 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3053}
3054
25ed6e8a
DW		 3055static int set_journal_csum_feature_set(struct super_block *sb)
3056{
3057 int ret = 1;
3058 int compat, incompat;
3059 struct ext4_sb_info *sbi = EXT4_SB(sb);
3060
3061 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3062 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3063 /* journal checksum v2 */
3064 compat = 0;
3065 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3066 } else {
3067 /* journal checksum v1 */
3068 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3069 incompat = 0;
3070 }
3071
3072 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3073 ret = jbd2_journal_set_features(sbi->s_journal,
3074 compat, 0,
3075 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3076 incompat);
3077 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3078 ret = jbd2_journal_set_features(sbi->s_journal,
3079 compat, 0,
3080 incompat);
3081 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3082 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3083 } else {
3084 jbd2_journal_clear_features(sbi->s_journal,
3085 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3086 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3087 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3088 }
3089
3090 return ret;
3091}
3092
952fc18e
TT		 3093/*
3094 * Note: calculating the overhead so we can be compatible with
3095 * historical BSD practice is quite difficult in the face of
3096 * clusters/bigalloc. This is because multiple metadata blocks from
3097 * different block group can end up in the same allocation cluster.
3098 * Calculating the exact overhead in the face of clustered allocation
3099 * requires either O(all block bitmaps) in memory or O(number of block
3100 * groups**2) in time. We will still calculate the superblock for
3101 * older file systems --- and if we come across with a bigalloc file
3102 * system with zero in s_overhead_clusters the estimate will be close to
3103 * correct especially for very large cluster sizes --- but for newer
3104 * file systems, it's better to calculate this figure once at mkfs
3105 * time, and store it in the superblock. If the superblock value is
3106 * present (even for non-bigalloc file systems), we will use it.
3107 */
3108static int count_overhead(struct super_block *sb, ext4_group_t grp,
3109 char *buf)
3110{
3111 struct ext4_sb_info *sbi = EXT4_SB(sb);
3112 struct ext4_group_desc *gdp;
3113 ext4_fsblk_t first_block, last_block, b;
3114 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3115 int s, j, count = 0;
3116
0548bbb8
TT		 3117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3118 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3119 sbi->s_itb_per_group + 2);
3120
952fc18e
TT		 3121 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3122 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3123 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3124 for (i = 0; i < ngroups; i++) {
3125 gdp = ext4_get_group_desc(sb, i, NULL);
3126 b = ext4_block_bitmap(sb, gdp);
3127 if (b >= first_block && b <= last_block) {
3128 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3129 count++;
3130 }
3131 b = ext4_inode_bitmap(sb, gdp);
3132 if (b >= first_block && b <= last_block) {
3133 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3134 count++;
3135 }
3136 b = ext4_inode_table(sb, gdp);
3137 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3138 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3139 int c = EXT4_B2C(sbi, b - first_block);
3140 ext4_set_bit(c, buf);
3141 count++;
3142 }
3143 if (i != grp)
3144 continue;
3145 s = 0;
3146 if (ext4_bg_has_super(sb, grp)) {
3147 ext4_set_bit(s++, buf);
3148 count++;
3149 }
3150 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3151 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3152 count++;
3153 }
3154 }
3155 if (!count)
3156 return 0;
3157 return EXT4_CLUSTERS_PER_GROUP(sb) -
3158 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3159}
3160
3161/*
3162 * Compute the overhead and stash it in sbi->s_overhead
3163 */
3164int ext4_calculate_overhead(struct super_block *sb)
3165{
3166 struct ext4_sb_info *sbi = EXT4_SB(sb);
3167 struct ext4_super_block *es = sbi->s_es;
3168 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3169 ext4_fsblk_t overhead = 0;
3170 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3171
3172 memset(buf, 0, PAGE_SIZE);
3173 if (!buf)
3174 return -ENOMEM;
3175
3176 /*
3177 * Compute the overhead (FS structures). This is constant
3178 * for a given filesystem unless the number of block groups
3179 * changes so we cache the previous value until it does.
3180 */
3181
3182 /*
3183 * All of the blocks before first_data_block are overhead
3184 */
3185 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3186
3187 /*
3188 * Add the overhead found in each block group
3189 */
3190 for (i = 0; i < ngroups; i++) {
3191 int blks;
3192
3193 blks = count_overhead(sb, i, buf);
3194 overhead += blks;
3195 if (blks)
3196 memset(buf, 0, PAGE_SIZE);
3197 cond_resched();
3198 }
3199 sbi->s_overhead = overhead;
3200 smp_wmb();
3201 free_page((unsigned long) buf);
3202 return 0;
3203}
3204
2b2d6d01 3205static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3206{
d4c402d9 3207 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3208 struct buffer_head *bh;
617ba13b
MC		 3209 struct ext4_super_block *es = NULL;
3210 struct ext4_sb_info *sbi;
3211 ext4_fsblk_t block;
3212 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3213 ext4_fsblk_t logical_sb_block;
ac27a0ec 3214 unsigned long offset = 0;
ac27a0ec
DK		 3215 unsigned long journal_devnum = 0;
3216 unsigned long def_mount_opts;
3217 struct inode *root;
9f6200bb 3218 char *cp;
0390131b 3219 const char *descr;
dcc7dae3 3220 int ret = -ENOMEM;
281b5995 3221 int blocksize, clustersize;
4ec11028
TT		 3222 unsigned int db_count;
3223 unsigned int i;
281b5995 3224 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3225 __u64 blocks_count;
833f4077 3226 int err;
b3881f74 3227 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3228 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3229
3230 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3231 if (!sbi)
dcc7dae3 3232 goto out_free_orig;
705895b6
PE		 3233
3234 sbi->s_blockgroup_lock =
3235 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3236 if (!sbi->s_blockgroup_lock) {
3237 kfree(sbi);
dcc7dae3 3238 goto out_free_orig;
705895b6 3239 }
ac27a0ec 3240 sb->s_fs_info = sbi;
2c0544b2 3241 sbi->s_sb = sb;
ac27a0ec 3242 sbi->s_mount_opt = 0;
08cefc7a
EB		 3243 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3244 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
240799cd 3245 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3246 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3247 if (sb->s_bdev->bd_part)
3248 sbi->s_sectors_written_start =
3249 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3250
9f6200bb
TT		 3251 /* Cleanup superblock name */
3252 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3253 *cp = '!';
3254
dcc7dae3 3255 ret = -EINVAL;
617ba13b 3256 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3257 if (!blocksize) {
b31e1552 3258 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3259 goto out_fail;
3260 }
3261
3262 /*
617ba13b 3263 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3264 * block sizes. We need to calculate the offset from buffer start.
3265 */
617ba13b 3266 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3267 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3268 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3269 } else {
70bbb3e0 3270 logical_sb_block = sb_block;
ac27a0ec
DK		 3271 }
3272
70bbb3e0 3273 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3274 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3275 goto out_fail;
3276 }
3277 /*
3278 * Note: s_es must be initialized as soon as possible because
617ba13b 3279 * some ext4 macro-instructions depend on its value
ac27a0ec 3280 */
2716b802 3281 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3282 sbi->s_es = es;
3283 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3284 if (sb->s_magic != EXT4_SUPER_MAGIC)
3285 goto cantfind_ext4;
afc32f7e 3286 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3287
feb0ab32
DW		 3288 /* Warn if metadata_csum and gdt_csum are both set. */
3289 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3290 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3291 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3292 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3293 "redundant flags; please run fsck.");
3294
d25425f8
DW		 3295 /* Check for a known checksum algorithm */
3296 if (!ext4_verify_csum_type(sb, es)) {
3297 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3298 "unknown checksum algorithm.");
3299 silent = 1;
3300 goto cantfind_ext4;
3301 }
3302
0441984a
DW		 3303 /* Load the checksum driver */
3304 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3305 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3306 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3307 if (IS_ERR(sbi->s_chksum_driver)) {
3308 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3309 ret = PTR_ERR(sbi->s_chksum_driver);
3310 sbi->s_chksum_driver = NULL;
3311 goto failed_mount;
3312 }
3313 }
3314
a9c47317
DW		 3315 /* Check superblock checksum */
3316 if (!ext4_superblock_csum_verify(sb, es)) {
3317 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3318 "invalid superblock checksum. Run e2fsck?");
3319 silent = 1;
3320 goto cantfind_ext4;
3321 }
3322
3323 /* Precompute checksum seed for all metadata */
3324 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3325 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3326 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3327 sizeof(es->s_uuid));
3328
ac27a0ec
DK		 3329 /* Set defaults before we parse the mount options */
3330 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3331 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3332 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3333 set_opt(sb, DEBUG);
87f26807 3334 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3335 set_opt(sb, GRPID);
617ba13b 3336 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3337 set_opt(sb, NO_UID32);
ea663336 3338 /* xattr user namespace & acls are now defaulted on */
03010a33 3339#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3340 set_opt(sb, XATTR_USER);
2e7842b8 3341#endif
03010a33 3342#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3343 set_opt(sb, POSIX_ACL);
2e7842b8 3344#endif
6fd7a467 3345 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3346 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3347 set_opt(sb, JOURNAL_DATA);
617ba13b 3348 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3349 set_opt(sb, ORDERED_DATA);
617ba13b 3350 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3351 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3352
3353 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3354 set_opt(sb, ERRORS_PANIC);
bb4f397a 3355 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3356 set_opt(sb, ERRORS_CONT);
bb4f397a 3357 else
fd8c37ec 3358 set_opt(sb, ERRORS_RO);
8b67f04a 3359 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3360 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3361 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3362 set_opt(sb, DISCARD);
ac27a0ec 3363
08cefc7a
EB		 3364 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3365 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3366 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3367 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3368 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3369
8b67f04a 3370 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3371 set_opt(sb, BARRIER);
ac27a0ec 3372
dd919b98
AK		 3373 /*
3374 * enable delayed allocation by default
3375 * Use -o nodelalloc to turn it off
3376 */
8b67f04a
TT		 3377 if (!IS_EXT3_SB(sb) &&
3378 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3379 set_opt(sb, DELALLOC);
dd919b98 3380
51ce6511
LC		 3381 /*
3382 * set default s_li_wait_mult for lazyinit, for the case there is
3383 * no mount option specified.
3384 */
3385 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3386
8b67f04a 3387 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3388 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3389 ext4_msg(sb, KERN_WARNING,
3390 "failed to parse options in superblock: %s",
3391 sbi->s_es->s_mount_opts);
3392 }
5a916be1 3393 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3394 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3395 &journal_ioprio, 0))
ac27a0ec
DK		 3396 goto failed_mount;
3397
56889787
TT		 3398 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3399 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3400 "with data=journal disables delayed "
3401 "allocation and O_DIRECT support!\n");
3402 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3403 ext4_msg(sb, KERN_ERR, "can't mount with "
3404 "both data=journal and delalloc");
3405 goto failed_mount;
3406 }
3407 if (test_opt(sb, DIOREAD_NOLOCK)) {
3408 ext4_msg(sb, KERN_ERR, "can't mount with "
3409 "both data=journal and delalloc");
3410 goto failed_mount;
3411 }
3412 if (test_opt(sb, DELALLOC))
3413 clear_opt(sb, DELALLOC);
3414 }
3415
3416 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3417 if (test_opt(sb, DIOREAD_NOLOCK)) {
3418 if (blocksize < PAGE_SIZE) {
3419 ext4_msg(sb, KERN_ERR, "can't mount with "
3420 "dioread_nolock if block size != PAGE_SIZE");
3421 goto failed_mount;
3422 }
3423 }
3424
ac27a0ec 3425 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3426 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3427
617ba13b
MC		 3428 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3429 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3430 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3431 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3432 ext4_msg(sb, KERN_WARNING,
3433 "feature flags set on rev 0 fs, "
3434 "running e2fsck is recommended");
469108ff 3435
2035e776
TT		 3436 if (IS_EXT2_SB(sb)) {
3437 if (ext2_feature_set_ok(sb))
3438 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3439 "using the ext4 subsystem");
3440 else {
3441 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3442 "to feature incompatibilities");
3443 goto failed_mount;
3444 }
3445 }
3446
3447 if (IS_EXT3_SB(sb)) {
3448 if (ext3_feature_set_ok(sb))
3449 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3450 "using the ext4 subsystem");
3451 else {
3452 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3453 "to feature incompatibilities");
3454 goto failed_mount;
3455 }
3456 }
3457
ac27a0ec
DK		 3458 /*
3459 * Check feature flags regardless of the revision level, since we
3460 * previously didn't change the revision level when setting the flags,
3461 * so there is a chance incompat flags are set on a rev 0 filesystem.
3462 */
a13fb1a4 3463 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3464 goto failed_mount;
a13fb1a4 3465
617ba13b
MC		 3466 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3467 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3468 ext4_msg(sb, KERN_ERR,
3469 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3470 goto failed_mount;
3471 }
3472
ac27a0ec 3473 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3474 /* Validate the filesystem blocksize */
3475 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3476 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3477 blocksize);
ac27a0ec
DK		 3478 goto failed_mount;
3479 }
3480
2b2d6d01 3481 brelse(bh);
70bbb3e0
AM		 3482 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3483 offset = do_div(logical_sb_block, blocksize);
3484 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3485 if (!bh) {
b31e1552
ES		 3486 ext4_msg(sb, KERN_ERR,
3487 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3488 goto failed_mount;
3489 }
2716b802 3490 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3491 sbi->s_es = es;
617ba13b 3492 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3493 ext4_msg(sb, KERN_ERR,
3494 "Magic mismatch, very weird!");
ac27a0ec
DK		 3495 goto failed_mount;
3496 }
3497 }
3498
a13fb1a4
ES		 3499 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3500 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3501 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3502 has_huge_files);
3503 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3504
617ba13b
MC		 3505 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3506 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3507 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3508 } else {
3509 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3510 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3511 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3512 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3513 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3514 ext4_msg(sb, KERN_ERR,
3515 "unsupported inode size: %d",
2b2d6d01 3516 sbi->s_inode_size);
ac27a0ec
DK		 3517 goto failed_mount;
3518 }
ef7f3835
KS		 3519 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3520 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3521 }
0b8e58a1 3522
0d1ee42f
AR		 3523 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3524 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3525 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3526 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3527 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3528 ext4_msg(sb, KERN_ERR,
3529 "unsupported descriptor size %lu",
0d1ee42f
AR		 3530 sbi->s_desc_size);
3531 goto failed_mount;
3532 }
3533 } else
3534 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3535
ac27a0ec 3536 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3537 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3538 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3539 goto cantfind_ext4;
0b8e58a1 3540
617ba13b 3541 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3542 if (sbi->s_inodes_per_block == 0)
617ba13b 3543 goto cantfind_ext4;
ac27a0ec
DK		 3544 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3545 sbi->s_inodes_per_block;
0d1ee42f 3546 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3547 sbi->s_sbh = bh;
3548 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3549 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3550 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3551
2b2d6d01 3552 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3553 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3554 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3555 i = le32_to_cpu(es->s_flags);
3556 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3557 sbi->s_hash_unsigned = 3;
3558 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3559#ifdef __CHAR_UNSIGNED__
3560 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3561 sbi->s_hash_unsigned = 3;
3562#else
3563 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3564#endif
f99b2589 3565 }
ac27a0ec 3566
281b5995
TT		 3567 /* Handle clustersize */
3568 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3569 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3570 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3571 if (has_bigalloc) {
3572 if (clustersize < blocksize) {
3573 ext4_msg(sb, KERN_ERR,
3574 "cluster size (%d) smaller than "
3575 "block size (%d)", clustersize, blocksize);
3576 goto failed_mount;
3577 }
3578 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3579 le32_to_cpu(es->s_log_block_size);
3580 sbi->s_clusters_per_group =
3581 le32_to_cpu(es->s_clusters_per_group);
3582 if (sbi->s_clusters_per_group > blocksize * 8) {
3583 ext4_msg(sb, KERN_ERR,
3584 "#clusters per group too big: %lu",
3585 sbi->s_clusters_per_group);
3586 goto failed_mount;
3587 }
3588 if (sbi->s_blocks_per_group !=
3589 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3590 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3591 "clusters per group (%lu) inconsistent",
3592 sbi->s_blocks_per_group,
3593 sbi->s_clusters_per_group);
3594 goto failed_mount;
3595 }
3596 } else {
3597 if (clustersize != blocksize) {
3598 ext4_warning(sb, "fragment/cluster size (%d) != "
3599 "block size (%d)", clustersize,
3600 blocksize);
3601 clustersize = blocksize;
3602 }
3603 if (sbi->s_blocks_per_group > blocksize * 8) {
3604 ext4_msg(sb, KERN_ERR,
3605 "#blocks per group too big: %lu",
3606 sbi->s_blocks_per_group);
3607 goto failed_mount;
3608 }
3609 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3610 sbi->s_cluster_bits = 0;
ac27a0ec 3611 }
281b5995
TT		 3612 sbi->s_cluster_ratio = clustersize / blocksize;
3613
ac27a0ec 3614 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3615 ext4_msg(sb, KERN_ERR,
3616 "#inodes per group too big: %lu",
2b2d6d01 3617 sbi->s_inodes_per_group);
ac27a0ec
DK		 3618 goto failed_mount;
3619 }
3620
bf43d84b
ES		 3621 /*
3622 * Test whether we have more sectors than will fit in sector_t,
3623 * and whether the max offset is addressable by the page cache.
3624 */
5a9ae68a 3625 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3626 ext4_blocks_count(es));
5a9ae68a 3627 if (err) {
b31e1552 3628 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3629 " too large to mount safely on this system");
ac27a0ec 3630 if (sizeof(sector_t) < 8)
90c699a9 3631 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3632 ret = err;
ac27a0ec
DK		 3633 goto failed_mount;
3634 }
3635
617ba13b
MC		 3636 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3637 goto cantfind_ext4;
e7c95593 3638
0f2ddca6
FTN		 3639 /* check blocks count against device size */
3640 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3641 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3642 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3643 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3644 ext4_blocks_count(es), blocks_count);
3645 goto failed_mount;
3646 }
3647
0b8e58a1
AD		 3648 /*
3649 * It makes no sense for the first data block to be beyond the end
3650 * of the filesystem.
3651 */
3652 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3653 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3654 "block %u is beyond end of filesystem (%llu)",
3655 le32_to_cpu(es->s_first_data_block),
3656 ext4_blocks_count(es));
e7c95593
ES		 3657 goto failed_mount;
3658 }
bd81d8ee
LV		 3659 blocks_count = (ext4_blocks_count(es) -
3660 le32_to_cpu(es->s_first_data_block) +
3661 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3662 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3663 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3664 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3665 "(block count %llu, first data block %u, "
b31e1552 3666 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3667 ext4_blocks_count(es),
3668 le32_to_cpu(es->s_first_data_block),
3669 EXT4_BLOCKS_PER_GROUP(sb));
3670 goto failed_mount;
3671 }
bd81d8ee 3672 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3673 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3674 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3675 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3676 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3677 sbi->s_group_desc = ext4_kvmalloc(db_count *
3678 sizeof(struct buffer_head *),
3679 GFP_KERNEL);
ac27a0ec 3680 if (sbi->s_group_desc == NULL) {
b31e1552 3681 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3682 ret = -ENOMEM;
ac27a0ec
DK		 3683 goto failed_mount;
3684 }
3685
9f6200bb
TT		 3686 if (ext4_proc_root)
3687 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3688
66acdcf4
TT		 3689 if (sbi->s_proc)
3690 proc_create_data("options", S_IRUGO, sbi->s_proc,
3691 &ext4_seq_options_fops, sb);
3692
705895b6 3693 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3694
3695 for (i = 0; i < db_count; i++) {
70bbb3e0 3696 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3697 sbi->s_group_desc[i] = sb_bread(sb, block);
3698 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3699 ext4_msg(sb, KERN_ERR,
3700 "can't read group descriptor %d", i);
ac27a0ec
DK		 3701 db_count = i;
3702 goto failed_mount2;
3703 }
3704 }
bfff6873 3705 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3706 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3707 goto failed_mount2;
3708 }
772cb7c8
JS		 3709 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3710 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3711 ext4_msg(sb, KERN_ERR,
3712 "unable to initialize "
3713 "flex_bg meta info!");
772cb7c8
JS		 3714 goto failed_mount2;
3715 }
3716
ac27a0ec
DK		 3717 sbi->s_gdb_count = db_count;
3718 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3719 spin_lock_init(&sbi->s_next_gen_lock);
3720
04496411
TM		 3721 init_timer(&sbi->s_err_report);
3722 sbi->s_err_report.function = print_daily_error_info;
3723 sbi->s_err_report.data = (unsigned long) sb;
3724
57042651 3725 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3726 ext4_count_free_clusters(sb));
ce7e010a
TT		 3727 if (!err) {
3728 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3729 ext4_count_free_inodes(sb));
3730 }
3731 if (!err) {
3732 err = percpu_counter_init(&sbi->s_dirs_counter,
3733 ext4_count_dirs(sb));
3734 }
3735 if (!err) {
57042651 3736 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3737 }
3738 if (err) {
3739 ext4_msg(sb, KERN_ERR, "insufficient memory");
2cde417d 3740 ret = err;
ce7e010a
TT		 3741 goto failed_mount3;
3742 }
3743
c9de560d 3744 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3745 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3746
ac27a0ec
DK		 3747 /*
3748 * set up enough so that it can read an inode
3749 */
9ca92389
TT		 3750 if (!test_opt(sb, NOLOAD) &&
3751 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3752 sb->s_op = &ext4_sops;
3753 else
3754 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3755 sb->s_export_op = &ext4_export_ops;
3756 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3757#ifdef CONFIG_QUOTA
617ba13b
MC		 3758 sb->s_qcop = &ext4_qctl_operations;
3759 sb->dq_op = &ext4_quota_operations;
7c319d32
AK		 3760
3761 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
3762 /* Use qctl operations for hidden quota files. */
3763 sb->s_qcop = &ext4_qctl_sysfile_operations;
3764 }
ac27a0ec 3765#endif
f2fa2ffc
AK		 3766 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3767
ac27a0ec 3768 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3769 mutex_init(&sbi->s_orphan_lock);
8f82f840 3770 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3771
3772 sb->s_root = NULL;
3773
3774 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3775 EXT4_HAS_INCOMPAT_FEATURE(sb,
3776 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3777
c5e06d10
JL		 3778 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3779 !(sb->s_flags & MS_RDONLY))
3780 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3781 goto failed_mount3;
3782
ac27a0ec
DK		 3783 /*
3784 * The first inode we look at is the journal inode. Don't try
3785 * root first: it may be modified in the journal!
3786 */
3787 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3788 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3789 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3790 goto failed_mount3;
0390131b
FM		 3791 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3792 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3793 ext4_msg(sb, KERN_ERR, "required journal recovery "
3794 "suppressed and not mounted read-only");
744692dc 3795 goto failed_mount_wq;
ac27a0ec 3796 } else {
fd8c37ec 3797 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3798 sbi->s_journal = NULL;
3799 needs_recovery = 0;
3800 goto no_journal;
ac27a0ec
DK		 3801 }
3802
f32aaf2d 3803 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3804 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3805 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3806 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3807 goto failed_mount_wq;
eb40a09c
JS		 3808 }
3809
25ed6e8a
DW		 3810 if (!set_journal_csum_feature_set(sb)) {
3811 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3812 "feature set");
3813 goto failed_mount_wq;
d4da6c9c 3814 }
818d276c 3815
ac27a0ec
DK		 3816 /* We have now updated the journal if required, so we can
3817 * validate the data journaling mode. */
3818 switch (test_opt(sb, DATA_FLAGS)) {
3819 case 0:
3820 /* No mode set, assume a default based on the journal
63f57933
AM		 3821 * capabilities: ORDERED_DATA if the journal can
3822 * cope, else JOURNAL_DATA
3823 */
dab291af
MC		 3824 if (jbd2_journal_check_available_features
3825 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3826 set_opt(sb, ORDERED_DATA);
ac27a0ec 3827 else
fd8c37ec 3828 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3829 break;
3830
617ba13b
MC		 3831 case EXT4_MOUNT_ORDERED_DATA:
3832 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3833 if (!jbd2_journal_check_available_features
3834 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3835 ext4_msg(sb, KERN_ERR, "Journal does not support "
3836 "requested data journaling mode");
744692dc 3837 goto failed_mount_wq;
ac27a0ec
DK		 3838 }
3839 default:
3840 break;
3841 }
b3881f74 3842 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3843
18aadd47
BJ		 3844 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3845
ce7e010a
TT		 3846 /*
3847 * The journal may have updated the bg summary counts, so we
3848 * need to update the global counters.
3849 */
57042651 3850 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3851 ext4_count_free_clusters(sb));
ce7e010a
TT		 3852 percpu_counter_set(&sbi->s_freeinodes_counter,
3853 ext4_count_free_inodes(sb));
3854 percpu_counter_set(&sbi->s_dirs_counter,
3855 ext4_count_dirs(sb));
57042651 3856 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3857
ce7e010a 3858no_journal:
952fc18e
TT		 3859 /*
3860 * Get the # of file system overhead blocks from the
3861 * superblock if present.
3862 */
3863 if (es->s_overhead_clusters)
3864 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3865 else {
3866 ret = ext4_calculate_overhead(sb);
3867 if (ret)
3868 goto failed_mount_wq;
3869 }
3870
fd89d5f2
TH		 3871 /*
3872 * The maximum number of concurrent works can be high and
3873 * concurrency isn't really necessary. Limit it to 1.
3874 */
3875 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3876 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3877 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3878 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3879 goto failed_mount_wq;
3880 }
3881
ac27a0ec 3882 /*
dab291af 3883 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3884 * so we can safely mount the rest of the filesystem now.
3885 */
3886
1d1fe1ee
DH		 3887 root = ext4_iget(sb, EXT4_ROOT_INO);
3888 if (IS_ERR(root)) {
b31e1552 3889 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3890 ret = PTR_ERR(root);
32a9bb57 3891 root = NULL;
ac27a0ec
DK		 3892 goto failed_mount4;
3893 }
3894 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3895 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3896 iput(root);
ac27a0ec
DK		 3897 goto failed_mount4;
3898 }
48fde701 3899 sb->s_root = d_make_root(root);
1d1fe1ee 3900 if (!sb->s_root) {
b31e1552 3901 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3902 ret = -ENOMEM;
3903 goto failed_mount4;
3904 }
ac27a0ec 3905
7e84b621
ES		 3906 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3907 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3908
3909 /* determine the minimum size of new large inodes, if present */
3910 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3911 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3912 EXT4_GOOD_OLD_INODE_SIZE;
3913 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3914 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3915 if (sbi->s_want_extra_isize <
3916 le16_to_cpu(es->s_want_extra_isize))
3917 sbi->s_want_extra_isize =
3918 le16_to_cpu(es->s_want_extra_isize);
3919 if (sbi->s_want_extra_isize <
3920 le16_to_cpu(es->s_min_extra_isize))
3921 sbi->s_want_extra_isize =
3922 le16_to_cpu(es->s_min_extra_isize);
3923 }
3924 }
3925 /* Check if enough inode space is available */
3926 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3927 sbi->s_inode_size) {
3928 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3929 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3930 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3931 "available");
ef7f3835
KS		 3932 }
3933
6fd058f7
TT		 3934 err = ext4_setup_system_zone(sb);
3935 if (err) {
b31e1552 3936 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3937 "zone (%d)", err);
94bf608a 3938 goto failed_mount4a;
6fd058f7
TT		 3939 }
3940
c2774d84 3941 ext4_ext_init(sb);
9d99012f 3942 err = ext4_mb_init(sb);
c2774d84 3943 if (err) {
421f91d2 3944 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3945 err);
dcf2d804 3946 goto failed_mount5;
c2774d84
AK		 3947 }
3948
bfff6873
LC		 3949 err = ext4_register_li_request(sb, first_not_zeroed);
3950 if (err)
dcf2d804 3951 goto failed_mount6;
bfff6873 3952
3197ebdb
TT		 3953 sbi->s_kobj.kset = ext4_kset;
3954 init_completion(&sbi->s_kobj_unregister);
3955 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3956 "%s", sb->s_id);
dcf2d804
TM		 3957 if (err)
3958 goto failed_mount7;
3197ebdb 3959
617ba13b
MC		 3960 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3961 ext4_orphan_cleanup(sb, es);
3962 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3963 if (needs_recovery) {
b31e1552 3964 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3965 ext4_mark_recovery_complete(sb, es);
3966 }
3967 if (EXT4_SB(sb)->s_journal) {
3968 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3969 descr = " journalled data mode";
3970 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3971 descr = " ordered data mode";
3972 else
3973 descr = " writeback data mode";
3974 } else
3975 descr = "out journal";
3976
7c319d32
AK		 3977#ifdef CONFIG_QUOTA
3978 /* Enable quota usage during mount. */
3979 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
3980 !(sb->s_flags & MS_RDONLY)) {
3981 ret = ext4_enable_quotas(sb);
3982 if (ret)
3983 goto failed_mount7;
3984 }
3985#endif /* CONFIG_QUOTA */
3986
d4c402d9 3987 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3988 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3989 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3990
66e61a9e
TT		 3991 if (es->s_error_count)
3992 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3993
d4c402d9 3994 kfree(orig_data);
ac27a0ec
DK		 3995 return 0;
3996
617ba13b 3997cantfind_ext4:
ac27a0ec 3998 if (!silent)
b31e1552 3999 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4000 goto failed_mount;
4001
dcf2d804
TM		 4002failed_mount7:
4003 ext4_unregister_li_request(sb);
4004failed_mount6:
dcf2d804 4005 ext4_mb_release(sb);
94bf608a
AV		 4006failed_mount5:
4007 ext4_ext_release(sb);
dcf2d804 4008 ext4_release_system_zone(sb);
94bf608a
AV		 4009failed_mount4a:
4010 dput(sb->s_root);
32a9bb57 4011 sb->s_root = NULL;
94bf608a 4012failed_mount4:
b31e1552 4013 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4014 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4015failed_mount_wq:
0390131b
FM		 4016 if (sbi->s_journal) {
4017 jbd2_journal_destroy(sbi->s_journal);
4018 sbi->s_journal = NULL;
4019 }
ac27a0ec 4020failed_mount3:
04496411 4021 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4022 if (sbi->s_flex_groups)
4023 ext4_kvfree(sbi->s_flex_groups);
57042651 4024 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4025 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4026 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4027 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 4028 if (sbi->s_mmp_tsk)
4029 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4030failed_mount2:
4031 for (i = 0; i < db_count; i++)
4032 brelse(sbi->s_group_desc[i]);
f18a5f21 4033 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4034failed_mount:
0441984a
DW		 4035 if (sbi->s_chksum_driver)
4036 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4037 if (sbi->s_proc) {
66acdcf4 4038 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4039 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4040 }
ac27a0ec
DK		 4041#ifdef CONFIG_QUOTA
4042 for (i = 0; i < MAXQUOTAS; i++)
4043 kfree(sbi->s_qf_names[i]);
4044#endif
617ba13b 4045 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4046 brelse(bh);
4047out_fail:
4048 sb->s_fs_info = NULL;
f6830165 4049 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4050 kfree(sbi);
dcc7dae3 4051out_free_orig:
d4c402d9 4052 kfree(orig_data);
1d1fe1ee 4053 return ret;
ac27a0ec
DK		 4054}
4055
4056/*
4057 * Setup any per-fs journal parameters now. We'll do this both on
4058 * initial mount, once the journal has been initialised but before we've
4059 * done any recovery; and again on any subsequent remount.
4060 */
617ba13b 4061static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4062{
617ba13b 4063 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4064
30773840
TT		 4065 journal->j_commit_interval = sbi->s_commit_interval;
4066 journal->j_min_batch_time = sbi->s_min_batch_time;
4067 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4068
a931da6a 4069 write_lock(&journal->j_state_lock);
ac27a0ec 4070 if (test_opt(sb, BARRIER))
dab291af 4071 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4072 else
dab291af 4073 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4074 if (test_opt(sb, DATA_ERR_ABORT))
4075 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4076 else
4077 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4078 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4079}
4080
617ba13b 4081static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4082 unsigned int journal_inum)
4083{
4084 struct inode *journal_inode;
4085 journal_t *journal;
4086
0390131b
FM		 4087 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4088
ac27a0ec
DK		 4089 /* First, test for the existence of a valid inode on disk. Bad
4090 * things happen if we iget() an unused inode, as the subsequent
4091 * iput() will try to delete it. */
4092
1d1fe1ee
DH		 4093 journal_inode = ext4_iget(sb, journal_inum);
4094 if (IS_ERR(journal_inode)) {
b31e1552 4095 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4096 return NULL;
4097 }
4098 if (!journal_inode->i_nlink) {
4099 make_bad_inode(journal_inode);
4100 iput(journal_inode);
b31e1552 4101 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4102 return NULL;
4103 }
4104
e5f8eab8 4105 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4106 journal_inode, journal_inode->i_size);
1d1fe1ee 4107 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4108 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4109 iput(journal_inode);
4110 return NULL;
4111 }
4112
dab291af 4113 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4114 if (!journal) {
b31e1552 4115 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4116 iput(journal_inode);
4117 return NULL;
4118 }
4119 journal->j_private = sb;
617ba13b 4120 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4121 return journal;
4122}
4123
617ba13b 4124static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4125 dev_t j_dev)
4126{
2b2d6d01 4127 struct buffer_head *bh;
ac27a0ec 4128 journal_t *journal;
617ba13b
MC		 4129 ext4_fsblk_t start;
4130 ext4_fsblk_t len;
ac27a0ec 4131 int hblock, blocksize;
617ba13b 4132 ext4_fsblk_t sb_block;
ac27a0ec 4133 unsigned long offset;
2b2d6d01 4134 struct ext4_super_block *es;
ac27a0ec
DK		 4135 struct block_device *bdev;
4136
0390131b
FM		 4137 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4138
b31e1552 4139 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4140 if (bdev == NULL)
4141 return NULL;
4142
ac27a0ec 4143 blocksize = sb->s_blocksize;
e1defc4f 4144 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4145 if (blocksize < hblock) {
b31e1552
ES		 4146 ext4_msg(sb, KERN_ERR,
4147 "blocksize too small for journal device");
ac27a0ec
DK		 4148 goto out_bdev;
4149 }
4150
617ba13b
MC		 4151 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4152 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4153 set_blocksize(bdev, blocksize);
4154 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4155 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4156 "external journal");
ac27a0ec
DK		 4157 goto out_bdev;
4158 }
4159
2716b802 4160 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4161 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4162 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4163 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4164 ext4_msg(sb, KERN_ERR, "external journal has "
4165 "bad superblock");
ac27a0ec
DK		 4166 brelse(bh);
4167 goto out_bdev;
4168 }
4169
617ba13b 4170 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4171 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4172 brelse(bh);
4173 goto out_bdev;
4174 }
4175
bd81d8ee 4176 len = ext4_blocks_count(es);
ac27a0ec
DK		 4177 start = sb_block + 1;
4178 brelse(bh); /* we're done with the superblock */
4179
dab291af 4180 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4181 start, len, blocksize);
4182 if (!journal) {
b31e1552 4183 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4184 goto out_bdev;
4185 }
4186 journal->j_private = sb;
4187 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4188 wait_on_buffer(journal->j_sb_buffer);
4189 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4190 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4191 goto out_journal;
4192 }
4193 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4194 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4195 "user (unsupported) - %d",
ac27a0ec
DK		 4196 be32_to_cpu(journal->j_superblock->s_nr_users));
4197 goto out_journal;
4198 }
617ba13b
MC		 4199 EXT4_SB(sb)->journal_bdev = bdev;
4200 ext4_init_journal_params(sb, journal);
ac27a0ec 4201 return journal;
0b8e58a1 4202
ac27a0ec 4203out_journal:
dab291af 4204 jbd2_journal_destroy(journal);
ac27a0ec 4205out_bdev:
617ba13b 4206 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4207 return NULL;
4208}
4209
617ba13b
MC		 4210static int ext4_load_journal(struct super_block *sb,
4211 struct ext4_super_block *es,
ac27a0ec
DK		 4212 unsigned long journal_devnum)
4213{
4214 journal_t *journal;
4215 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4216 dev_t journal_dev;
4217 int err = 0;
4218 int really_read_only;
4219
0390131b
FM		 4220 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4221
ac27a0ec
DK		 4222 if (journal_devnum &&
4223 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4224 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4225 "numbers have changed");
ac27a0ec
DK		 4226 journal_dev = new_decode_dev(journal_devnum);
4227 } else
4228 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4229
4230 really_read_only = bdev_read_only(sb->s_bdev);
4231
4232 /*
4233 * Are we loading a blank journal or performing recovery after a
4234 * crash? For recovery, we need to check in advance whether we
4235 * can get read-write access to the device.
4236 */
617ba13b 4237 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4238 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4239 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4240 "required on readonly filesystem");
ac27a0ec 4241 if (really_read_only) {
b31e1552
ES		 4242 ext4_msg(sb, KERN_ERR, "write access "
4243 "unavailable, cannot proceed");
ac27a0ec
DK		 4244 return -EROFS;
4245 }
b31e1552
ES		 4246 ext4_msg(sb, KERN_INFO, "write access will "
4247 "be enabled during recovery");
ac27a0ec
DK		 4248 }
4249 }
4250
4251 if (journal_inum && journal_dev) {
b31e1552
ES		 4252 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4253 "and inode journals!");
ac27a0ec
DK		 4254 return -EINVAL;
4255 }
4256
4257 if (journal_inum) {
617ba13b 4258 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4259 return -EINVAL;
4260 } else {
617ba13b 4261 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4262 return -EINVAL;
4263 }
4264
90576c0b 4265 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4266 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4267
617ba13b 4268 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4269 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4270 if (!err) {
4271 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4272 if (save)
4273 memcpy(save, ((char *) es) +
4274 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4275 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4276 if (save)
4277 memcpy(((char *) es) + EXT4_S_ERR_START,
4278 save, EXT4_S_ERR_LEN);
4279 kfree(save);
4280 }
ac27a0ec
DK		 4281
4282 if (err) {
b31e1552 4283 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4284 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4285 return err;
4286 }
4287
617ba13b
MC		 4288 EXT4_SB(sb)->s_journal = journal;
4289 ext4_clear_journal_err(sb, es);
ac27a0ec 4290
c41303ce 4291 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4292 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4293 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4294
4295 /* Make sure we flush the recovery flag to disk. */
e2d67052 4296 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4297 }
4298
4299 return 0;
4300}
4301
e2d67052 4302static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4303{
e2d67052 4304 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4305 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4306 int error = 0;
ac27a0ec 4307
7c2e7087 4308 if (!sbh || block_device_ejected(sb))
c4be0c1d 4309 return error;
914258bf
TT		 4310 if (buffer_write_io_error(sbh)) {
4311 /*
4312 * Oh, dear. A previous attempt to write the
4313 * superblock failed. This could happen because the
4314 * USB device was yanked out. Or it could happen to
4315 * be a transient write error and maybe the block will
4316 * be remapped. Nothing we can do but to retry the
4317 * write and hope for the best.
4318 */
b31e1552
ES		 4319 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4320 "superblock detected");
914258bf
TT		 4321 clear_buffer_write_io_error(sbh);
4322 set_buffer_uptodate(sbh);
4323 }
71290b36
TT		 4324 /*
4325 * If the file system is mounted read-only, don't update the
4326 * superblock write time. This avoids updating the superblock
4327 * write time when we are mounting the root file system
4328 * read/only but we need to replay the journal; at that point,
4329 * for people who are east of GMT and who make their clock
4330 * tick in localtime for Windows bug-for-bug compatibility,
4331 * the clock is set in the future, and this will cause e2fsck
4332 * to complain and force a full file system check.
4333 */
4334 if (!(sb->s_flags & MS_RDONLY))
4335 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4336 if (sb->s_bdev->bd_part)
4337 es->s_kbytes_written =
4338 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4339 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4340 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4341 else
4342 es->s_kbytes_written =
4343 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4344 ext4_free_blocks_count_set(es,
4345 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4346 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4347 es->s_free_inodes_count =
4348 cpu_to_le32(percpu_counter_sum_positive(
4349 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4350 BUFFER_TRACE(sbh, "marking dirty");
a9c47317 4351 ext4_superblock_csum_set(sb, es);
ac27a0ec 4352 mark_buffer_dirty(sbh);
914258bf 4353 if (sync) {
c4be0c1d
TS		 4354 error = sync_dirty_buffer(sbh);
4355 if (error)
4356 return error;
4357
4358 error = buffer_write_io_error(sbh);
4359 if (error) {
b31e1552
ES		 4360 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4361 "superblock");
914258bf
TT		 4362 clear_buffer_write_io_error(sbh);
4363 set_buffer_uptodate(sbh);
4364 }
4365 }
c4be0c1d 4366 return error;
ac27a0ec
DK		 4367}
4368
ac27a0ec
DK		 4369/*
4370 * Have we just finished recovery? If so, and if we are mounting (or
4371 * remounting) the filesystem readonly, then we will end up with a
4372 * consistent fs on disk. Record that fact.
4373 */
2b2d6d01
TT		 4374static void ext4_mark_recovery_complete(struct super_block *sb,
4375 struct ext4_super_block *es)
ac27a0ec 4376{
617ba13b 4377 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4378
0390131b
FM		 4379 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4380 BUG_ON(journal != NULL);
4381 return;
4382 }
dab291af 4383 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4384 if (jbd2_journal_flush(journal) < 0)
4385 goto out;
4386
617ba13b 4387 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4388 sb->s_flags & MS_RDONLY) {
617ba13b 4389 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4390 ext4_commit_super(sb, 1);
ac27a0ec 4391 }
7ffe1ea8
HK		 4392
4393out:
dab291af 4394 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4395}
4396
4397/*
4398 * If we are mounting (or read-write remounting) a filesystem whose journal
4399 * has recorded an error from a previous lifetime, move that error to the
4400 * main filesystem now.
4401 */
2b2d6d01
TT		 4402static void ext4_clear_journal_err(struct super_block *sb,
4403 struct ext4_super_block *es)
ac27a0ec
DK		 4404{
4405 journal_t *journal;
4406 int j_errno;
4407 const char *errstr;
4408
0390131b
FM		 4409 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4410
617ba13b 4411 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4412
4413 /*
4414 * Now check for any error status which may have been recorded in the
617ba13b 4415 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4416 */
4417
dab291af 4418 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4419 if (j_errno) {
4420 char nbuf[16];
4421
617ba13b 4422 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4423 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4424 "from previous mount: %s", errstr);
12062ddd 4425 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4426
617ba13b
MC		 4427 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4428 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4429 ext4_commit_super(sb, 1);
ac27a0ec 4430
dab291af 4431 jbd2_journal_clear_err(journal);
d796c52e 4432 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4433 }
4434}
4435
4436/*
4437 * Force the running and committing transactions to commit,
4438 * and wait on the commit.
4439 */
617ba13b 4440int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4441{
4442 journal_t *journal;
0390131b 4443 int ret = 0;
ac27a0ec
DK		 4444
4445 if (sb->s_flags & MS_RDONLY)
4446 return 0;
4447
617ba13b 4448 journal = EXT4_SB(sb)->s_journal;
8e8ad8a5 4449 if (journal)
0390131b 4450 ret = ext4_journal_force_commit(journal);
0390131b 4451
ac27a0ec
DK		 4452 return ret;
4453}
4454
617ba13b 4455static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4456{
14ce0cb4 4457 int ret = 0;
9eddacf9 4458 tid_t target;
8d5d02e6 4459 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4460
9bffad1e 4461 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4462 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4463 /*
4464 * Writeback quota in non-journalled quota case - journalled quota has
4465 * no dirty dquots
4466 */
4467 dquot_writeback_dquots(sb, -1);
8d5d02e6 4468 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4469 if (wait)
8d5d02e6 4470 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4471 }
14ce0cb4 4472 return ret;
ac27a0ec
DK		 4473}
4474
4475/*
4476 * LVM calls this function before a (read-only) snapshot is created. This
4477 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4478 *
4479 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4480 * state independently. It relies on upper layer to stop all data & metadata
4481 * modifications.
ac27a0ec 4482 */
c4be0c1d 4483static int ext4_freeze(struct super_block *sb)
ac27a0ec 4484{
c4be0c1d
TS		 4485 int error = 0;
4486 journal_t *journal;
ac27a0ec 4487
9ca92389
TT		 4488 if (sb->s_flags & MS_RDONLY)
4489 return 0;
ac27a0ec 4490
9ca92389 4491 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4492
9ca92389
TT		 4493 /* Now we set up the journal barrier. */
4494 jbd2_journal_lock_updates(journal);
ac27a0ec 4495
9ca92389
TT		 4496 /*
4497 * Don't clear the needs_recovery flag if we failed to flush
4498 * the journal.
4499 */
4500 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4501 if (error < 0)
4502 goto out;
9ca92389
TT		 4503
4504 /* Journal blocked and flushed, clear needs_recovery flag. */
4505 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4506 error = ext4_commit_super(sb, 1);
6b0310fb 4507out:
8e8ad8a5 4508 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4509 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4510 return error;
ac27a0ec
DK		 4511}
4512
4513/*
4514 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4515 * flag here, even though the filesystem is not technically dirty yet.
4516 */
c4be0c1d 4517static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4518{
9ca92389
TT		 4519 if (sb->s_flags & MS_RDONLY)
4520 return 0;
4521
4522 lock_super(sb);
4523 /* Reset the needs_recovery flag before the fs is unlocked. */
4524 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4525 ext4_commit_super(sb, 1);
4526 unlock_super(sb);
c4be0c1d 4527 return 0;
ac27a0ec
DK		 4528}
4529
673c6100
TT		 4530/*
4531 * Structure to save mount options for ext4_remount's benefit
4532 */
4533struct ext4_mount_options {
4534 unsigned long s_mount_opt;
a2595b8a 4535 unsigned long s_mount_opt2;
08cefc7a
EB		 4536 kuid_t s_resuid;
4537 kgid_t s_resgid;
673c6100
TT		 4538 unsigned long s_commit_interval;
4539 u32 s_min_batch_time, s_max_batch_time;
4540#ifdef CONFIG_QUOTA
4541 int s_jquota_fmt;
4542 char *s_qf_names[MAXQUOTAS];
4543#endif
4544};
4545
2b2d6d01 4546static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4547{
2b2d6d01 4548 struct ext4_super_block *es;
617ba13b 4549 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4550 unsigned long old_sb_flags;
617ba13b 4551 struct ext4_mount_options old_opts;
c79d967d 4552 int enable_quota = 0;
8a266467 4553 ext4_group_t g;
b3881f74 4554 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4555 int err = 0;
ac27a0ec
DK		 4556#ifdef CONFIG_QUOTA
4557 int i;
4558#endif
d4c402d9 4559 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4560
4561 /* Store the original options */
bbd6851a 4562 lock_super(sb);
ac27a0ec
DK		 4563 old_sb_flags = sb->s_flags;
4564 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4565 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4566 old_opts.s_resuid = sbi->s_resuid;
4567 old_opts.s_resgid = sbi->s_resgid;
4568 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4569 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4570 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4571#ifdef CONFIG_QUOTA
4572 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4573 for (i = 0; i < MAXQUOTAS; i++)
4574 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4575#endif
b3881f74
TT		 4576 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4577 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4578
4579 /*
4580 * Allow the "check" option to be passed as a remount option.
4581 */
661aa520 4582 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4583 err = -EINVAL;
4584 goto restore_opts;
4585 }
4586
4ab2f15b 4587 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4588 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4589
4590 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4591 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4592
4593 es = sbi->s_es;
4594
b3881f74 4595 if (sbi->s_journal) {
0390131b 4596 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4597 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4598 }
ac27a0ec 4599
661aa520 4600 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4601 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4602 err = -EROFS;
4603 goto restore_opts;
4604 }
4605
4606 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4607 err = dquot_suspend(sb, -1);
4608 if (err < 0)
c79d967d 4609 goto restore_opts;
c79d967d 4610
ac27a0ec
DK		 4611 /*
4612 * First of all, the unconditional stuff we have to do
4613 * to disable replay of the journal when we next remount
4614 */
4615 sb->s_flags |= MS_RDONLY;
4616
4617 /*
4618 * OK, test if we are remounting a valid rw partition
4619 * readonly, and if so set the rdonly flag and then
4620 * mark the partition as valid again.
4621 */
617ba13b
MC		 4622 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4623 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4624 es->s_state = cpu_to_le16(sbi->s_mount_state);
4625
a63c9eb2 4626 if (sbi->s_journal)
0390131b 4627 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4628 } else {
a13fb1a4
ES		 4629 /* Make sure we can mount this feature set readwrite */
4630 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4631 err = -EROFS;
4632 goto restore_opts;
4633 }
8a266467
TT		 4634 /*
4635 * Make sure the group descriptor checksums
0b8e58a1 4636 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4637 */
4638 for (g = 0; g < sbi->s_groups_count; g++) {
4639 struct ext4_group_desc *gdp =
4640 ext4_get_group_desc(sb, g, NULL);
4641
feb0ab32 4642 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4643 ext4_msg(sb, KERN_ERR,
4644 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4645 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4646 le16_to_cpu(gdp->bg_checksum));
4647 err = -EINVAL;
4648 goto restore_opts;
4649 }
4650 }
4651
ead6596b
ES		 4652 /*
4653 * If we have an unprocessed orphan list hanging
4654 * around from a previously readonly bdev mount,
4655 * require a full umount/remount for now.
4656 */
4657 if (es->s_last_orphan) {
b31e1552 4658 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4659 "remount RDWR because of unprocessed "
4660 "orphan inode list. Please "
b31e1552 4661 "umount/remount instead");
ead6596b
ES		 4662 err = -EINVAL;
4663 goto restore_opts;
4664 }
4665
ac27a0ec
DK		 4666 /*
4667 * Mounting a RDONLY partition read-write, so reread
4668 * and store the current valid flag. (It may have
4669 * been changed by e2fsck since we originally mounted
4670 * the partition.)
4671 */
0390131b
FM		 4672 if (sbi->s_journal)
4673 ext4_clear_journal_err(sb, es);
ac27a0ec 4674 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4675 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4676 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4677 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4678 EXT4_FEATURE_INCOMPAT_MMP))
4679 if (ext4_multi_mount_protect(sb,
4680 le64_to_cpu(es->s_mmp_block))) {
4681 err = -EROFS;
4682 goto restore_opts;
4683 }
c79d967d 4684 enable_quota = 1;
ac27a0ec
DK		 4685 }
4686 }
bfff6873
LC		 4687
4688 /*
4689 * Reinitialize lazy itable initialization thread based on
4690 * current settings
4691 */
4692 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4693 ext4_unregister_li_request(sb);
4694 else {
4695 ext4_group_t first_not_zeroed;
4696 first_not_zeroed = ext4_has_uninit_itable(sb);
4697 ext4_register_li_request(sb, first_not_zeroed);
4698 }
4699
6fd058f7 4700 ext4_setup_system_zone(sb);
0390131b 4701 if (sbi->s_journal == NULL)
e2d67052 4702 ext4_commit_super(sb, 1);
0390131b 4703
7c319d32 4704 unlock_super(sb);
ac27a0ec
DK		 4705#ifdef CONFIG_QUOTA
4706 /* Release old quota file names */
4707 for (i = 0; i < MAXQUOTAS; i++)
4708 if (old_opts.s_qf_names[i] &&
4709 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4710 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4711 if (enable_quota) {
4712 if (sb_any_quota_suspended(sb))
4713 dquot_resume(sb, -1);
4714 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4715 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4716 err = ext4_enable_quotas(sb);
4717 if (err) {
4718 lock_super(sb);
4719 goto restore_opts;
4720 }
4721 }
4722 }
ac27a0ec 4723#endif
d4c402d9
CW		 4724
4725 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4726 kfree(orig_data);
ac27a0ec 4727 return 0;
0b8e58a1 4728
ac27a0ec
DK		 4729restore_opts:
4730 sb->s_flags = old_sb_flags;
4731 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4732 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4733 sbi->s_resuid = old_opts.s_resuid;
4734 sbi->s_resgid = old_opts.s_resgid;
4735 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4736 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4737 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4738#ifdef CONFIG_QUOTA
4739 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4740 for (i = 0; i < MAXQUOTAS; i++) {
4741 if (sbi->s_qf_names[i] &&
4742 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4743 kfree(sbi->s_qf_names[i]);
4744 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4745 }
4746#endif
bbd6851a 4747 unlock_super(sb);
d4c402d9 4748 kfree(orig_data);
ac27a0ec
DK		 4749 return err;
4750}
4751
2b2d6d01 4752static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4753{
4754 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4755 struct ext4_sb_info *sbi = EXT4_SB(sb);
4756 struct ext4_super_block *es = sbi->s_es;
952fc18e 4757 ext4_fsblk_t overhead = 0;
960cc398 4758 u64 fsid;
d02a9391 4759 s64 bfree;
ac27a0ec 4760
952fc18e
TT		 4761 if (!test_opt(sb, MINIX_DF))
4762 overhead = sbi->s_overhead;
ac27a0ec 4763
617ba13b 4764 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4765 buf->f_bsize = sb->s_blocksize;
952fc18e 4766 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
57042651
TT		 4767 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4768 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4769 /* prevent underflow in case that few free space is available */
57042651 4770 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4771 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4772 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4773 buf->f_bavail = 0;
4774 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4775 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4776 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4777 fsid = le64_to_cpup((void *)es->s_uuid) ^
4778 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4779 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4780 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4781
ac27a0ec
DK		 4782 return 0;
4783}
4784
0b8e58a1
AD		 4785/* Helper function for writing quotas on sync - we need to start transaction
4786 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4787 * Process 1 Process 2
617ba13b 4788 * ext4_create() quota_sync()
a269eb18 4789 * jbd2_journal_start() write_dquot()
871a2931 4790 * dquot_initialize() down(dqio_mutex)
dab291af 4791 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4792 *
4793 */
4794
4795#ifdef CONFIG_QUOTA
4796
4797static inline struct inode *dquot_to_inode(struct dquot *dquot)
4798{
4799 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4800}
4801
617ba13b 4802static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4803{
4804 int ret, err;
4805 handle_t *handle;
4806 struct inode *inode;
4807
4808 inode = dquot_to_inode(dquot);
617ba13b 4809 handle = ext4_journal_start(inode,
0b8e58a1 4810 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4811 if (IS_ERR(handle))
4812 return PTR_ERR(handle);
4813 ret = dquot_commit(dquot);
617ba13b 4814 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4815 if (!ret)
4816 ret = err;
4817 return ret;
4818}
4819
617ba13b 4820static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4821{
4822 int ret, err;
4823 handle_t *handle;
4824
617ba13b 4825 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4826 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4827 if (IS_ERR(handle))
4828 return PTR_ERR(handle);
4829 ret = dquot_acquire(dquot);
617ba13b 4830 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4831 if (!ret)
4832 ret = err;
4833 return ret;
4834}
4835
617ba13b 4836static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4837{
4838 int ret, err;
4839 handle_t *handle;
4840
617ba13b 4841 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4842 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4843 if (IS_ERR(handle)) {
4844 /* Release dquot anyway to avoid endless cycle in dqput() */
4845 dquot_release(dquot);
ac27a0ec 4846 return PTR_ERR(handle);
9c3013e9 4847 }
ac27a0ec 4848 ret = dquot_release(dquot);
617ba13b 4849 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4850 if (!ret)
4851 ret = err;
4852 return ret;
4853}
4854
617ba13b 4855static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4856{
2c8be6b2 4857 /* Are we journaling quotas? */
617ba13b
MC		 4858 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4859 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4860 dquot_mark_dquot_dirty(dquot);
617ba13b 4861 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4862 } else {
4863 return dquot_mark_dquot_dirty(dquot);
4864 }
4865}
4866
617ba13b 4867static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4868{
4869 int ret, err;
4870 handle_t *handle;
4871
4872 /* Data block + inode block */
617ba13b 4873 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4874 if (IS_ERR(handle))
4875 return PTR_ERR(handle);
4876 ret = dquot_commit_info(sb, type);
617ba13b 4877 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4878 if (!ret)
4879 ret = err;
4880 return ret;
4881}
4882
4883/*
4884 * Turn on quotas during mount time - we need to find
4885 * the quota file and such...
4886 */
617ba13b 4887static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4888{
287a8095
CH		 4889 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4890 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4891}
4892
4893/*
4894 * Standard function to be called on quota_on
4895 */
617ba13b 4896static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4897 struct path *path)
ac27a0ec
DK		 4898{
4899 int err;
ac27a0ec
DK		 4900
4901 if (!test_opt(sb, QUOTA))
4902 return -EINVAL;
0623543b 4903
ac27a0ec 4904 /* Quotafile not on the same filesystem? */
d8c9584e 4905 if (path->dentry->d_sb != sb)
ac27a0ec 4906 return -EXDEV;
0623543b
JK		 4907 /* Journaling quota? */
4908 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4909 /* Quotafile not in fs root? */
f00c9e44 4910 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4911 ext4_msg(sb, KERN_WARNING,
4912 "Quota file not on filesystem root. "
4913 "Journaled quota will not work");
2b2d6d01 4914 }
0623543b
JK		 4915
4916 /*
4917 * When we journal data on quota file, we have to flush journal to see
4918 * all updates to the file when we bypass pagecache...
4919 */
0390131b 4920 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4921 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4922 /*
4923 * We don't need to lock updates but journal_flush() could
4924 * otherwise be livelocked...
4925 */
4926 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4927 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4928 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4929 if (err)
7ffe1ea8 4930 return err;
0623543b
JK		 4931 }
4932
f00c9e44 4933 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4934}
4935
7c319d32
AK		 4936static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4937 unsigned int flags)
4938{
4939 int err;
4940 struct inode *qf_inode;
4941 unsigned long qf_inums[MAXQUOTAS] = {
4942 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4943 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4944 };
4945
4946 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4947
4948 if (!qf_inums[type])
4949 return -EPERM;
4950
4951 qf_inode = ext4_iget(sb, qf_inums[type]);
4952 if (IS_ERR(qf_inode)) {
4953 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4954 return PTR_ERR(qf_inode);
4955 }
4956
4957 err = dquot_enable(qf_inode, type, format_id, flags);
4958 iput(qf_inode);
4959
4960 return err;
4961}
4962
4963/* Enable usage tracking for all quota types. */
4964static int ext4_enable_quotas(struct super_block *sb)
4965{
4966 int type, err = 0;
4967 unsigned long qf_inums[MAXQUOTAS] = {
4968 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4969 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4970 };
4971
4972 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
4973 for (type = 0; type < MAXQUOTAS; type++) {
4974 if (qf_inums[type]) {
4975 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
4976 DQUOT_USAGE_ENABLED);
4977 if (err) {
4978 ext4_warning(sb,
4979 "Failed to enable quota (type=%d) "
4980 "tracking. Please run e2fsck to fix.",
4981 type);
4982 return err;
4983 }
4984 }
4985 }
4986 return 0;
4987}
4988
4989/*
4990 * quota_on function that is used when QUOTA feature is set.
4991 */
4992static int ext4_quota_on_sysfile(struct super_block *sb, int type,
4993 int format_id)
4994{
4995 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
4996 return -EINVAL;
4997
4998 /*
4999 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5000 */
5001 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5002}
5003
ca0e05e4
DM		 5004static int ext4_quota_off(struct super_block *sb, int type)
5005{
21f97697
JK		 5006 struct inode *inode = sb_dqopt(sb)->files[type];
5007 handle_t *handle;
5008
87009d86
DM		 5009 /* Force all delayed allocation blocks to be allocated.
5010 * Caller already holds s_umount sem */
5011 if (test_opt(sb, DELALLOC))
ca0e05e4 5012 sync_filesystem(sb);
ca0e05e4 5013
0b268590
AG		 5014 if (!inode)
5015 goto out;
5016
21f97697
JK		 5017 /* Update modification times of quota files when userspace can
5018 * start looking at them */
5019 handle = ext4_journal_start(inode, 1);
5020 if (IS_ERR(handle))
5021 goto out;
5022 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5023 ext4_mark_inode_dirty(handle, inode);
5024 ext4_journal_stop(handle);
5025
5026out:
ca0e05e4
DM		 5027 return dquot_quota_off(sb, type);
5028}
5029
7c319d32
AK		 5030/*
5031 * quota_off function that is used when QUOTA feature is set.
5032 */
5033static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5034{
5035 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5036 return -EINVAL;
5037
5038 /* Disable only the limits. */
5039 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5040}
5041
ac27a0ec
DK		 5042/* Read data from quotafile - avoid pagecache and such because we cannot afford
5043 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5044 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5045 * we don't have to be afraid of races */
617ba13b 5046static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5047 size_t len, loff_t off)
5048{
5049 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5050 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5051 int err = 0;
5052 int offset = off & (sb->s_blocksize - 1);
5053 int tocopy;
5054 size_t toread;
5055 struct buffer_head *bh;
5056 loff_t i_size = i_size_read(inode);
5057
5058 if (off > i_size)
5059 return 0;
5060 if (off+len > i_size)
5061 len = i_size-off;
5062 toread = len;
5063 while (toread > 0) {
5064 tocopy = sb->s_blocksize - offset < toread ?
5065 sb->s_blocksize - offset : toread;
617ba13b 5066 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5067 if (err)
5068 return err;
5069 if (!bh) /* A hole? */
5070 memset(data, 0, tocopy);
5071 else
5072 memcpy(data, bh->b_data+offset, tocopy);
5073 brelse(bh);
5074 offset = 0;
5075 toread -= tocopy;
5076 data += tocopy;
5077 blk++;
5078 }
5079 return len;
5080}
5081
5082/* Write to quotafile (we know the transaction is already started and has
5083 * enough credits) */
617ba13b 5084static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5085 const char *data, size_t len, loff_t off)
5086{
5087 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5088 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5089 int err = 0;
5090 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5091 struct buffer_head *bh;
5092 handle_t *handle = journal_current_handle();
5093
0390131b 5094 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5095 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5096 " cancelled because transaction is not started",
9c3013e9
JK		 5097 (unsigned long long)off, (unsigned long long)len);
5098 return -EIO;
5099 }
67eeb568
DM		 5100 /*
5101 * Since we account only one data block in transaction credits,
5102 * then it is impossible to cross a block boundary.
5103 */
5104 if (sb->s_blocksize - offset < len) {
5105 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5106 " cancelled because not block aligned",
5107 (unsigned long long)off, (unsigned long long)len);
5108 return -EIO;
5109 }
5110
67eeb568
DM		 5111 bh = ext4_bread(handle, inode, blk, 1, &err);
5112 if (!bh)
5113 goto out;
62d2b5f2
JK		 5114 err = ext4_journal_get_write_access(handle, bh);
5115 if (err) {
5116 brelse(bh);
5117 goto out;
ac27a0ec 5118 }
67eeb568
DM		 5119 lock_buffer(bh);
5120 memcpy(bh->b_data+offset, data, len);
5121 flush_dcache_page(bh->b_page);
5122 unlock_buffer(bh);
62d2b5f2 5123 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5124 brelse(bh);
ac27a0ec 5125out:
0b7f7cef 5126 if (err)
ac27a0ec 5127 return err;
67eeb568
DM		 5128 if (inode->i_size < off + len) {
5129 i_size_write(inode, off + len);
617ba13b 5130 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5131 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5132 }
67eeb568 5133 return len;
ac27a0ec
DK		 5134}
5135
5136#endif
5137
152a0836
AV		 5138static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5139 const char *dev_name, void *data)
ac27a0ec 5140{
152a0836 5141 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5142}
5143
37f328eb 5144#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5145static inline void register_as_ext2(void)
5146{
5147 int err = register_filesystem(&ext2_fs_type);
5148 if (err)
5149 printk(KERN_WARNING
5150 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5151}
5152
5153static inline void unregister_as_ext2(void)
5154{
5155 unregister_filesystem(&ext2_fs_type);
5156}
2035e776
TT		 5157
5158static inline int ext2_feature_set_ok(struct super_block *sb)
5159{
5160 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5161 return 0;
5162 if (sb->s_flags & MS_RDONLY)
5163 return 1;
5164 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5165 return 0;
5166 return 1;
5167}
51b7e3c9 5168MODULE_ALIAS("ext2");
24b58424
TT		 5169#else
5170static inline void register_as_ext2(void) { }
5171static inline void unregister_as_ext2(void) { }
2035e776 5172static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5173#endif
5174
37f328eb 5175#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5176static inline void register_as_ext3(void)
5177{
5178 int err = register_filesystem(&ext3_fs_type);
5179 if (err)
5180 printk(KERN_WARNING
5181 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5182}
5183
5184static inline void unregister_as_ext3(void)
5185{
5186 unregister_filesystem(&ext3_fs_type);
5187}
2035e776
TT		 5188
5189static inline int ext3_feature_set_ok(struct super_block *sb)
5190{
5191 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5192 return 0;
5193 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5194 return 0;
5195 if (sb->s_flags & MS_RDONLY)
5196 return 1;
5197 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5198 return 0;
5199 return 1;
5200}
51b7e3c9 5201MODULE_ALIAS("ext3");
24b58424
TT		 5202#else
5203static inline void register_as_ext3(void) { }
5204static inline void unregister_as_ext3(void) { }
2035e776 5205static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5206#endif
5207
03010a33
TT		 5208static struct file_system_type ext4_fs_type = {
5209 .owner = THIS_MODULE,
5210 .name = "ext4",
152a0836 5211 .mount = ext4_mount,
03010a33
TT		 5212 .kill_sb = kill_block_super,
5213 .fs_flags = FS_REQUIRES_DEV,
5214};
5215
8f021222 5216static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5217{
5218 struct ext4_features *ef;
5219 int ret = -ENOMEM;
5220
5221 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5222 if (!ef)
5223 goto out;
5224
5225 ef->f_kobj.kset = ext4_kset;
5226 init_completion(&ef->f_kobj_unregister);
5227 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5228 "features");
5229 if (ret) {
5230 kfree(ef);
5231 goto out;
5232 }
5233
5234 ext4_feat = ef;
5235 ret = 0;
5236out:
5237 return ret;
5238}
5239
8f021222
LC		 5240static void ext4_exit_feat_adverts(void)
5241{
5242 kobject_put(&ext4_feat->f_kobj);
5243 wait_for_completion(&ext4_feat->f_kobj_unregister);
5244 kfree(ext4_feat);
5245}
5246
e9e3bcec
ES		 5247/* Shared across all ext4 file systems */
5248wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5249struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5250
5dabfc78 5251static int __init ext4_init_fs(void)
ac27a0ec 5252{
e9e3bcec 5253 int i, err;
c9de560d 5254
07c0c5d8
AV		 5255 ext4_li_info = NULL;
5256 mutex_init(&ext4_li_mtx);
5257
12e9b892 5258 ext4_check_flag_values();
e9e3bcec
ES		 5259
5260 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5261 mutex_init(&ext4__aio_mutex[i]);
5262 init_waitqueue_head(&ext4__ioend_wq[i]);
5263 }
5264
5dabfc78 5265 err = ext4_init_pageio();
6fd058f7
TT		 5266 if (err)
5267 return err;
5dabfc78 5268 err = ext4_init_system_zone();
bd2d0210 5269 if (err)
d44651d0 5270 goto out6;
3197ebdb
TT		 5271 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5272 if (!ext4_kset)
dd68314c 5273 goto out5;
d44651d0 5274 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5275
5276 err = ext4_init_feat_adverts();
dd68314c
TT		 5277 if (err)
5278 goto out4;
857ac889 5279
5dabfc78 5280 err = ext4_init_mballoc();
ac27a0ec 5281 if (err)
6fd058f7 5282 goto out3;
c9de560d 5283
5dabfc78 5284 err = ext4_init_xattr();
c9de560d
AT		 5285 if (err)
5286 goto out2;
ac27a0ec
DK		 5287 err = init_inodecache();
5288 if (err)
5289 goto out1;
24b58424 5290 register_as_ext3();
2035e776 5291 register_as_ext2();
03010a33 5292 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5293 if (err)
5294 goto out;
bfff6873 5295
ac27a0ec
DK		 5296 return 0;
5297out:
24b58424
TT		 5298 unregister_as_ext2();
5299 unregister_as_ext3();
ac27a0ec
DK		 5300 destroy_inodecache();
5301out1:
5dabfc78 5302 ext4_exit_xattr();
c9de560d 5303out2:
5dabfc78 5304 ext4_exit_mballoc();
6fd058f7 5305out3:
8f021222 5306 ext4_exit_feat_adverts();
dd68314c 5307out4:
d44651d0
FJ		 5308 if (ext4_proc_root)
5309 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5310 kset_unregister(ext4_kset);
d44651d0 5311out5:
5dabfc78 5312 ext4_exit_system_zone();
d44651d0 5313out6:
5dabfc78 5314 ext4_exit_pageio();
ac27a0ec
DK		 5315 return err;
5316}
5317
5dabfc78 5318static void __exit ext4_exit_fs(void)
ac27a0ec 5319{
bfff6873 5320 ext4_destroy_lazyinit_thread();
24b58424
TT		 5321 unregister_as_ext2();
5322 unregister_as_ext3();
03010a33 5323 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5324 destroy_inodecache();
5dabfc78
TT		 5325 ext4_exit_xattr();
5326 ext4_exit_mballoc();
8f021222 5327 ext4_exit_feat_adverts();
9f6200bb 5328 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5329 kset_unregister(ext4_kset);
5dabfc78
TT		 5330 ext4_exit_system_zone();
5331 ext4_exit_pageio();
ac27a0ec
DK		 5332}
5333
5334MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5335MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5336MODULE_LICENSE("GPL");
5dabfc78
TT		 5337module_init(ext4_init_fs)
5338module_exit(ext4_exit_fs)
kernel source for telekom puls (alcatel/mediatek)