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Merge branch 'for-4.6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[deliverable/linux.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>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 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>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
7abc52c2 40#include <linux/cleancache.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
e294a537 58static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 59
617ba13b 60static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 61 unsigned long journal_devnum);
2adf6da8 62static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 63static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 64static void ext4_mark_recovery_complete(struct super_block *sb,
65 struct ext4_super_block *es);
66static void ext4_clear_journal_err(struct super_block *sb,
67 struct ext4_super_block *es);
617ba13b 68static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 69static int ext4_remount(struct super_block *sb, int *flags, char *data);
70static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 71static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 72static int ext4_freeze(struct super_block *sb);
152a0836
AV		 73static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
74 const char *dev_name, void *data);
2035e776
TT		 75static inline int ext2_feature_set_ok(struct super_block *sb);
76static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 77static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 78static void ext4_destroy_lazyinit_thread(void);
79static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 80static void ext4_clear_request_list(void);
ac27a0ec 81
e74031fd
JK		 82/*
83 * Lock ordering
84 *
85 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
86 * i_mmap_rwsem (inode->i_mmap_rwsem)!
87 *
88 * page fault path:
89 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
90 * page lock -> i_data_sem (rw)
91 *
92 * buffered write path:
93 * sb_start_write -> i_mutex -> mmap_sem
94 * sb_start_write -> i_mutex -> transaction start -> page lock ->
95 * i_data_sem (rw)
96 *
97 * truncate:
98 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
99 * i_mmap_rwsem (w) -> page lock
100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
101 * transaction start -> i_data_sem (rw)
102 *
103 * direct IO:
104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
105 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
106 * transaction start -> i_data_sem (rw)
107 *
108 * writepages:
109 * transaction start -> page lock(s) -> i_data_sem (rw)
110 */
111
c290ea01 112#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 113static struct file_system_type ext2_fs_type = {
114 .owner = THIS_MODULE,
115 .name = "ext2",
116 .mount = ext4_mount,
117 .kill_sb = kill_block_super,
118 .fs_flags = FS_REQUIRES_DEV,
119};
7f78e035 120MODULE_ALIAS_FS("ext2");
fa7614dd 121MODULE_ALIAS("ext2");
2035e776
TT		 122#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
123#else
124#define IS_EXT2_SB(sb) (0)
125#endif
126
127
ba69f9ab
JK		 128static struct file_system_type ext3_fs_type = {
129 .owner = THIS_MODULE,
130 .name = "ext3",
152a0836 131 .mount = ext4_mount,
ba69f9ab
JK		 132 .kill_sb = kill_block_super,
133 .fs_flags = FS_REQUIRES_DEV,
134};
7f78e035 135MODULE_ALIAS_FS("ext3");
fa7614dd 136MODULE_ALIAS("ext3");
ba69f9ab 137#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 138
d25425f8
DW		 139static int ext4_verify_csum_type(struct super_block *sb,
140 struct ext4_super_block *es)
141{
e2b911c5 142 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 143 return 1;
144
145 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
146}
147
a9c47317
DW		 148static __le32 ext4_superblock_csum(struct super_block *sb,
149 struct ext4_super_block *es)
150{
151 struct ext4_sb_info *sbi = EXT4_SB(sb);
152 int offset = offsetof(struct ext4_super_block, s_checksum);
153 __u32 csum;
154
155 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
156
157 return cpu_to_le32(csum);
158}
159
c197855e
SH		 160static int ext4_superblock_csum_verify(struct super_block *sb,
161 struct ext4_super_block *es)
a9c47317 162{
9aa5d32b 163 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 164 return 1;
165
166 return es->s_checksum == ext4_superblock_csum(sb, es);
167}
168
06db49e6 169void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 170{
06db49e6
TT		 171 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
172
9aa5d32b 173 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 174 return;
175
176 es->s_checksum = ext4_superblock_csum(sb, es);
177}
178
9933fc0a
TT		 179void *ext4_kvmalloc(size_t size, gfp_t flags)
180{
181 void *ret;
182
8be04b93 183 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 184 if (!ret)
185 ret = __vmalloc(size, flags, PAGE_KERNEL);
186 return ret;
187}
188
189void *ext4_kvzalloc(size_t size, gfp_t flags)
190{
191 void *ret;
192
8be04b93 193 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 194 if (!ret)
195 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
196 return ret;
197}
198
8fadc143
AR		 199ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
200 struct ext4_group_desc *bg)
bd81d8ee 201{
3a14589c 202 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 203 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 204 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 205}
206
8fadc143
AR		 207ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
208 struct ext4_group_desc *bg)
bd81d8ee 209{
5272f837 210 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 211 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 212 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 213}
214
8fadc143
AR		 215ext4_fsblk_t ext4_inode_table(struct super_block *sb,
216 struct ext4_group_desc *bg)
bd81d8ee 217{
5272f837 218 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 219 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 220 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 221}
222
021b65bb
TT		 223__u32 ext4_free_group_clusters(struct super_block *sb,
224 struct ext4_group_desc *bg)
560671a0
AK		 225{
226 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
227 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 228 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 229}
230
231__u32 ext4_free_inodes_count(struct super_block *sb,
232 struct ext4_group_desc *bg)
233{
234 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
235 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 236 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 237}
238
239__u32 ext4_used_dirs_count(struct super_block *sb,
240 struct ext4_group_desc *bg)
241{
242 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
243 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 244 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 245}
246
247__u32 ext4_itable_unused_count(struct super_block *sb,
248 struct ext4_group_desc *bg)
249{
250 return le16_to_cpu(bg->bg_itable_unused_lo) |
251 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 252 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 253}
254
8fadc143
AR		 255void ext4_block_bitmap_set(struct super_block *sb,
256 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 257{
3a14589c 258 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 259 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
260 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 261}
262
8fadc143
AR		 263void ext4_inode_bitmap_set(struct super_block *sb,
264 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 265{
5272f837 266 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 267 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
268 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 269}
270
8fadc143
AR		 271void ext4_inode_table_set(struct super_block *sb,
272 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 273{
5272f837 274 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 275 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
276 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 277}
278
021b65bb
TT		 279void ext4_free_group_clusters_set(struct super_block *sb,
280 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 281{
282 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
283 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
284 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
285}
286
287void ext4_free_inodes_set(struct super_block *sb,
288 struct ext4_group_desc *bg, __u32 count)
289{
290 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
291 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
292 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
293}
294
295void ext4_used_dirs_set(struct super_block *sb,
296 struct ext4_group_desc *bg, __u32 count)
297{
298 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
299 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
300 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
301}
302
303void ext4_itable_unused_set(struct super_block *sb,
304 struct ext4_group_desc *bg, __u32 count)
305{
306 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
307 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
308 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
309}
310
d3d1faf6 311
1c13d5c0
TT		 312static void __save_error_info(struct super_block *sb, const char *func,
313 unsigned int line)
314{
315 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
316
317 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 318 if (bdev_read_only(sb->s_bdev))
319 return;
1c13d5c0
TT		 320 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
321 es->s_last_error_time = cpu_to_le32(get_seconds());
322 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
323 es->s_last_error_line = cpu_to_le32(line);
324 if (!es->s_first_error_time) {
325 es->s_first_error_time = es->s_last_error_time;
326 strncpy(es->s_first_error_func, func,
327 sizeof(es->s_first_error_func));
328 es->s_first_error_line = cpu_to_le32(line);
329 es->s_first_error_ino = es->s_last_error_ino;
330 es->s_first_error_block = es->s_last_error_block;
331 }
66e61a9e
TT		 332 /*
333 * Start the daily error reporting function if it hasn't been
334 * started already
335 */
336 if (!es->s_error_count)
337 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 338 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 339}
340
341static void save_error_info(struct super_block *sb, const char *func,
342 unsigned int line)
343{
344 __save_error_info(sb, func, line);
345 ext4_commit_super(sb, 1);
346}
347
bdfe0cbd
TT		 348/*
349 * The del_gendisk() function uninitializes the disk-specific data
350 * structures, including the bdi structure, without telling anyone
351 * else. Once this happens, any attempt to call mark_buffer_dirty()
352 * (for example, by ext4_commit_super), will cause a kernel OOPS.
353 * This is a kludge to prevent these oops until we can put in a proper
354 * hook in del_gendisk() to inform the VFS and file system layers.
355 */
356static int block_device_ejected(struct super_block *sb)
357{
358 struct inode *bd_inode = sb->s_bdev->bd_inode;
359 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
360
361 return bdi->dev == NULL;
362}
363
18aadd47
BJ		 364static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
365{
366 struct super_block *sb = journal->j_private;
367 struct ext4_sb_info *sbi = EXT4_SB(sb);
368 int error = is_journal_aborted(journal);
5d3ee208 369 struct ext4_journal_cb_entry *jce;
18aadd47 370
5d3ee208 371 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 372 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 373 while (!list_empty(&txn->t_private_list)) {
374 jce = list_entry(txn->t_private_list.next,
375 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 376 list_del_init(&jce->jce_list);
377 spin_unlock(&sbi->s_md_lock);
378 jce->jce_func(sb, jce, error);
379 spin_lock(&sbi->s_md_lock);
380 }
381 spin_unlock(&sbi->s_md_lock);
382}
1c13d5c0 383
ac27a0ec
DK		 384/* Deal with the reporting of failure conditions on a filesystem such as
385 * inconsistencies detected or read IO failures.
386 *
387 * On ext2, we can store the error state of the filesystem in the
617ba13b 388 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 389 * write ordering constraints on the superblock which prevent us from
390 * writing it out straight away; and given that the journal is about to
391 * be aborted, we can't rely on the current, or future, transactions to
392 * write out the superblock safely.
393 *
dab291af 394 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 395 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 396 * that error until we've noted it down and cleared it.
397 */
398
617ba13b 399static void ext4_handle_error(struct super_block *sb)
ac27a0ec 400{
ac27a0ec
DK		 401 if (sb->s_flags & MS_RDONLY)
402 return;
403
2b2d6d01 404 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 405 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 406
4ab2f15b 407 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 408 if (journal)
dab291af 409 jbd2_journal_abort(journal, -EIO);
ac27a0ec 410 }
2b2d6d01 411 if (test_opt(sb, ERRORS_RO)) {
b31e1552 412 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 413 /*
414 * Make sure updated value of ->s_mount_flags will be visible
415 * before ->s_flags update
416 */
417 smp_wmb();
ac27a0ec
DK		 418 sb->s_flags |= MS_RDONLY;
419 }
4327ba52
DJ		 420 if (test_opt(sb, ERRORS_PANIC)) {
421 if (EXT4_SB(sb)->s_journal &&
422 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
423 return;
617ba13b 424 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 425 sb->s_id);
4327ba52 426 }
ac27a0ec
DK		 427}
428
efbed4dc
TT		 429#define ext4_error_ratelimit(sb) \
430 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
431 "EXT4-fs error")
432
12062ddd 433void __ext4_error(struct super_block *sb, const char *function,
c398eda0 434 unsigned int line, const char *fmt, ...)
ac27a0ec 435{
0ff2ea7d 436 struct va_format vaf;
ac27a0ec
DK		 437 va_list args;
438
efbed4dc
TT		 439 if (ext4_error_ratelimit(sb)) {
440 va_start(args, fmt);
441 vaf.fmt = fmt;
442 vaf.va = &args;
443 printk(KERN_CRIT
444 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
445 sb->s_id, function, line, current->comm, &vaf);
446 va_end(args);
447 }
f3fc0210 448 save_error_info(sb, function, line);
617ba13b 449 ext4_handle_error(sb);
ac27a0ec
DK		 450}
451
e7c96e8e
JP		 452void __ext4_error_inode(struct inode *inode, const char *function,
453 unsigned int line, ext4_fsblk_t block,
454 const char *fmt, ...)
273df556
FM		 455{
456 va_list args;
f7c21177 457 struct va_format vaf;
1c13d5c0 458 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 459
1c13d5c0
TT		 460 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
461 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 462 if (ext4_error_ratelimit(inode->i_sb)) {
463 va_start(args, fmt);
464 vaf.fmt = fmt;
465 vaf.va = &args;
466 if (block)
467 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
468 "inode #%lu: block %llu: comm %s: %pV\n",
469 inode->i_sb->s_id, function, line, inode->i_ino,
470 block, current->comm, &vaf);
471 else
472 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
473 "inode #%lu: comm %s: %pV\n",
474 inode->i_sb->s_id, function, line, inode->i_ino,
475 current->comm, &vaf);
476 va_end(args);
477 }
1c13d5c0 478 save_error_info(inode->i_sb, function, line);
273df556
FM		 479 ext4_handle_error(inode->i_sb);
480}
481
e7c96e8e
JP		 482void __ext4_error_file(struct file *file, const char *function,
483 unsigned int line, ext4_fsblk_t block,
484 const char *fmt, ...)
273df556
FM		 485{
486 va_list args;
f7c21177 487 struct va_format vaf;
1c13d5c0 488 struct ext4_super_block *es;
496ad9aa 489 struct inode *inode = file_inode(file);
273df556
FM		 490 char pathname[80], *path;
491
1c13d5c0
TT		 492 es = EXT4_SB(inode->i_sb)->s_es;
493 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 494 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 495 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 496 if (IS_ERR(path))
497 path = "(unknown)";
498 va_start(args, fmt);
499 vaf.fmt = fmt;
500 vaf.va = &args;
501 if (block)
502 printk(KERN_CRIT
503 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
504 "block %llu: comm %s: path %s: %pV\n",
505 inode->i_sb->s_id, function, line, inode->i_ino,
506 block, current->comm, path, &vaf);
507 else
508 printk(KERN_CRIT
509 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
510 "comm %s: path %s: %pV\n",
511 inode->i_sb->s_id, function, line, inode->i_ino,
512 current->comm, path, &vaf);
513 va_end(args);
514 }
1c13d5c0 515 save_error_info(inode->i_sb, function, line);
273df556
FM		 516 ext4_handle_error(inode->i_sb);
517}
518
722887dd
TT		 519const char *ext4_decode_error(struct super_block *sb, int errno,
520 char nbuf[16])
ac27a0ec
DK		 521{
522 char *errstr = NULL;
523
524 switch (errno) {
6a797d27
DW		 525 case -EFSCORRUPTED:
526 errstr = "Corrupt filesystem";
527 break;
528 case -EFSBADCRC:
529 errstr = "Filesystem failed CRC";
530 break;
ac27a0ec
DK		 531 case -EIO:
532 errstr = "IO failure";
533 break;
534 case -ENOMEM:
535 errstr = "Out of memory";
536 break;
537 case -EROFS:
78f1ddbb
TT		 538 if (!sb || (EXT4_SB(sb)->s_journal &&
539 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 540 errstr = "Journal has aborted";
541 else
542 errstr = "Readonly filesystem";
543 break;
544 default:
545 /* If the caller passed in an extra buffer for unknown
546 * errors, textualise them now. Else we just return
547 * NULL. */
548 if (nbuf) {
549 /* Check for truncated error codes... */
550 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
551 errstr = nbuf;
552 }
553 break;
554 }
555
556 return errstr;
557}
558
617ba13b 559/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 560 * automatically and invokes the appropriate error response. */
561
c398eda0
TT		 562void __ext4_std_error(struct super_block *sb, const char *function,
563 unsigned int line, int errno)
ac27a0ec
DK		 564{
565 char nbuf[16];
566 const char *errstr;
567
568 /* Special case: if the error is EROFS, and we're not already
569 * inside a transaction, then there's really no point in logging
570 * an error. */
571 if (errno == -EROFS && journal_current_handle() == NULL &&
572 (sb->s_flags & MS_RDONLY))
573 return;
574
efbed4dc
TT		 575 if (ext4_error_ratelimit(sb)) {
576 errstr = ext4_decode_error(sb, errno, nbuf);
577 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
578 sb->s_id, function, line, errstr);
579 }
ac27a0ec 580
efbed4dc 581 save_error_info(sb, function, line);
617ba13b 582 ext4_handle_error(sb);
ac27a0ec
DK		 583}
584
585/*
617ba13b 586 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 587 * abort function may be used to deal with unrecoverable failures such
588 * as journal IO errors or ENOMEM at a critical moment in log management.
589 *
590 * We unconditionally force the filesystem into an ABORT|READONLY state,
591 * unless the error response on the fs has been set to panic in which
592 * case we take the easy way out and panic immediately.
593 */
594
c67d859e 595void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 596 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 597{
598 va_list args;
599
1c13d5c0 600 save_error_info(sb, function, line);
ac27a0ec 601 va_start(args, fmt);
c398eda0
TT		 602 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
603 function, line);
ac27a0ec
DK		 604 vprintk(fmt, args);
605 printk("\n");
606 va_end(args);
607
1c13d5c0
TT		 608 if ((sb->s_flags & MS_RDONLY) == 0) {
609 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 610 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 611 /*
612 * Make sure updated value of ->s_mount_flags will be visible
613 * before ->s_flags update
614 */
615 smp_wmb();
616 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 617 if (EXT4_SB(sb)->s_journal)
618 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
619 save_error_info(sb, function, line);
620 }
4327ba52
DJ		 621 if (test_opt(sb, ERRORS_PANIC)) {
622 if (EXT4_SB(sb)->s_journal &&
623 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
624 return;
617ba13b 625 panic("EXT4-fs panic from previous error\n");
4327ba52 626 }
ac27a0ec
DK		 627}
628
e7c96e8e
JP		 629void __ext4_msg(struct super_block *sb,
630 const char *prefix, const char *fmt, ...)
b31e1552 631{
0ff2ea7d 632 struct va_format vaf;
b31e1552
ES		 633 va_list args;
634
efbed4dc
TT		 635 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
636 return;
637
b31e1552 638 va_start(args, fmt);
0ff2ea7d
JP		 639 vaf.fmt = fmt;
640 vaf.va = &args;
641 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 642 va_end(args);
643}
644
b03a2f7e
AD		 645#define ext4_warning_ratelimit(sb) \
646 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
647 "EXT4-fs warning")
648
12062ddd 649void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 650 unsigned int line, const char *fmt, ...)
ac27a0ec 651{
0ff2ea7d 652 struct va_format vaf;
ac27a0ec
DK		 653 va_list args;
654
b03a2f7e 655 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 656 return;
657
ac27a0ec 658 va_start(args, fmt);
0ff2ea7d
JP		 659 vaf.fmt = fmt;
660 vaf.va = &args;
661 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
662 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 663 va_end(args);
664}
665
b03a2f7e
AD		 666void __ext4_warning_inode(const struct inode *inode, const char *function,
667 unsigned int line, const char *fmt, ...)
668{
669 struct va_format vaf;
670 va_list args;
671
672 if (!ext4_warning_ratelimit(inode->i_sb))
673 return;
674
675 va_start(args, fmt);
676 vaf.fmt = fmt;
677 vaf.va = &args;
678 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
679 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
680 function, line, inode->i_ino, current->comm, &vaf);
681 va_end(args);
682}
683
e29136f8
TT		 684void __ext4_grp_locked_error(const char *function, unsigned int line,
685 struct super_block *sb, ext4_group_t grp,
686 unsigned long ino, ext4_fsblk_t block,
687 const char *fmt, ...)
5d1b1b3f
AK		 688__releases(bitlock)
689__acquires(bitlock)
690{
0ff2ea7d 691 struct va_format vaf;
5d1b1b3f
AK		 692 va_list args;
693 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
694
1c13d5c0
TT		 695 es->s_last_error_ino = cpu_to_le32(ino);
696 es->s_last_error_block = cpu_to_le64(block);
697 __save_error_info(sb, function, line);
0ff2ea7d 698
efbed4dc
TT		 699 if (ext4_error_ratelimit(sb)) {
700 va_start(args, fmt);
701 vaf.fmt = fmt;
702 vaf.va = &args;
703 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
704 sb->s_id, function, line, grp);
705 if (ino)
706 printk(KERN_CONT "inode %lu: ", ino);
707 if (block)
708 printk(KERN_CONT "block %llu:",
709 (unsigned long long) block);
710 printk(KERN_CONT "%pV\n", &vaf);
711 va_end(args);
712 }
5d1b1b3f
AK		 713
714 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 715 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 716 return;
717 }
1c13d5c0 718
5d1b1b3f
AK		 719 ext4_unlock_group(sb, grp);
720 ext4_handle_error(sb);
721 /*
722 * We only get here in the ERRORS_RO case; relocking the group
723 * may be dangerous, but nothing bad will happen since the
724 * filesystem will have already been marked read/only and the
725 * journal has been aborted. We return 1 as a hint to callers
726 * who might what to use the return value from
25985edc 727 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 728 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
729 * aggressively from the ext4 function in question, with a
730 * more appropriate error code.
731 */
732 ext4_lock_group(sb, grp);
733 return;
734}
735
617ba13b 736void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 737{
617ba13b 738 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 739
617ba13b 740 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 741 return;
742
12062ddd 743 ext4_warning(sb,
ac27a0ec
DK		 744 "updating to rev %d because of new feature flag, "
745 "running e2fsck is recommended",
617ba13b 746 EXT4_DYNAMIC_REV);
ac27a0ec 747
617ba13b
MC		 748 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
749 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
750 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 751 /* leave es->s_feature_*compat flags alone */
752 /* es->s_uuid will be set by e2fsck if empty */
753
754 /*
755 * The rest of the superblock fields should be zero, and if not it
756 * means they are likely already in use, so leave them alone. We
757 * can leave it up to e2fsck to clean up any inconsistencies there.
758 */
759}
760
761/*
762 * Open the external journal device
763 */
b31e1552 764static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 765{
766 struct block_device *bdev;
767 char b[BDEVNAME_SIZE];
768
d4d77629 769 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 770 if (IS_ERR(bdev))
771 goto fail;
772 return bdev;
773
774fail:
b31e1552 775 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 776 __bdevname(dev, b), PTR_ERR(bdev));
777 return NULL;
778}
779
780/*
781 * Release the journal device
782 */
4385bab1 783static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 784{
4385bab1 785 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 786}
787
4385bab1 788static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 789{
790 struct block_device *bdev;
ac27a0ec
DK		 791 bdev = sbi->journal_bdev;
792 if (bdev) {
4385bab1 793 ext4_blkdev_put(bdev);
ac27a0ec
DK		 794 sbi->journal_bdev = NULL;
795 }
ac27a0ec
DK		 796}
797
798static inline struct inode *orphan_list_entry(struct list_head *l)
799{
617ba13b 800 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 801}
802
617ba13b 803static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 804{
805 struct list_head *l;
806
b31e1552
ES		 807 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
808 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 809
810 printk(KERN_ERR "sb_info orphan list:\n");
811 list_for_each(l, &sbi->s_orphan) {
812 struct inode *inode = orphan_list_entry(l);
813 printk(KERN_ERR " "
814 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
815 inode->i_sb->s_id, inode->i_ino, inode,
816 inode->i_mode, inode->i_nlink,
817 NEXT_ORPHAN(inode));
818 }
819}
820
2b2d6d01 821static void ext4_put_super(struct super_block *sb)
ac27a0ec 822{
617ba13b
MC		 823 struct ext4_sb_info *sbi = EXT4_SB(sb);
824 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 825 int i, err;
ac27a0ec 826
857ac889 827 ext4_unregister_li_request(sb);
e0ccfd95
CH		 828 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
829
2e8fa54e 830 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 831 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 832
0390131b
FM		 833 if (sbi->s_journal) {
834 err = jbd2_journal_destroy(sbi->s_journal);
835 sbi->s_journal = NULL;
836 if (err < 0)
c67d859e 837 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 838 }
d4edac31 839
ebd173be 840 ext4_unregister_sysfs(sb);
d3922a77 841 ext4_es_unregister_shrinker(sbi);
9105bb14 842 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 843 ext4_release_system_zone(sb);
844 ext4_mb_release(sb);
845 ext4_ext_release(sb);
d4edac31 846
ac27a0ec 847 if (!(sb->s_flags & MS_RDONLY)) {
e2b911c5 848 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 849 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 850 }
58c5873a 851 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 852 ext4_commit_super(sb, 1);
853
ac27a0ec
DK		 854 for (i = 0; i < sbi->s_gdb_count; i++)
855 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 856 kvfree(sbi->s_group_desc);
857 kvfree(sbi->s_flex_groups);
57042651 858 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 859 percpu_counter_destroy(&sbi->s_freeinodes_counter);
860 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 861 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 862 brelse(sbi->s_sbh);
863#ifdef CONFIG_QUOTA
a2d4a646 864 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 865 kfree(sbi->s_qf_names[i]);
866#endif
867
868 /* Debugging code just in case the in-memory inode orphan list
869 * isn't empty. The on-disk one can be non-empty if we've
870 * detected an error and taken the fs readonly, but the
871 * in-memory list had better be clean by this point. */
872 if (!list_empty(&sbi->s_orphan))
873 dump_orphan_list(sb, sbi);
874 J_ASSERT(list_empty(&sbi->s_orphan));
875
89d96a6f 876 sync_blockdev(sb->s_bdev);
f98393a6 877 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 878 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
879 /*
880 * Invalidate the journal device's buffers. We don't want them
881 * floating about in memory - the physical journal device may
882 * hotswapped, and it breaks the `ro-after' testing code.
883 */
884 sync_blockdev(sbi->journal_bdev);
f98393a6 885 invalidate_bdev(sbi->journal_bdev);
617ba13b 886 ext4_blkdev_remove(sbi);
ac27a0ec 887 }
9c191f70
M		 888 if (sbi->s_mb_cache) {
889 ext4_xattr_destroy_cache(sbi->s_mb_cache);
890 sbi->s_mb_cache = NULL;
891 }
c5e06d10
JL		 892 if (sbi->s_mmp_tsk)
893 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 894 sb->s_fs_info = NULL;
3197ebdb
TT		 895 /*
896 * Now that we are completely done shutting down the
897 * superblock, we need to actually destroy the kobject.
898 */
3197ebdb
TT		 899 kobject_put(&sbi->s_kobj);
900 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 901 if (sbi->s_chksum_driver)
902 crypto_free_shash(sbi->s_chksum_driver);
705895b6 903 kfree(sbi->s_blockgroup_lock);
ac27a0ec 904 kfree(sbi);
ac27a0ec
DK		 905}
906
e18b890b 907static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 908
909/*
910 * Called inside transaction, so use GFP_NOFS
911 */
617ba13b 912static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 913{
617ba13b 914 struct ext4_inode_info *ei;
ac27a0ec 915
e6b4f8da 916 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 917 if (!ei)
918 return NULL;
0b8e58a1 919
ac27a0ec 920 ei->vfs_inode.i_version = 1;
202ee5df 921 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 922 INIT_LIST_HEAD(&ei->i_prealloc_list);
923 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 924 ext4_es_init_tree(&ei->i_es_tree);
925 rwlock_init(&ei->i_es_lock);
edaa53ca 926 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 927 ei->i_es_all_nr = 0;
edaa53ca 928 ei->i_es_shk_nr = 0;
dd475925 929 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 930 ei->i_reserved_data_blocks = 0;
931 ei->i_reserved_meta_blocks = 0;
932 ei->i_allocated_meta_blocks = 0;
9d0be502 933 ei->i_da_metadata_calc_len = 0;
7e731bc9 934 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 935 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 936#ifdef CONFIG_QUOTA
937 ei->i_reserved_quota = 0;
96c7e0d9 938 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 939#endif
8aefcd55 940 ei->jinode = NULL;
2e8fa54e 941 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 942 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 943 ei->i_sync_tid = 0;
944 ei->i_datasync_tid = 0;
e27f41e1 945 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 946 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0 947#ifdef CONFIG_EXT4_FS_ENCRYPTION
b7236e21 948 ei->i_crypt_info = NULL;
b30ab0e0 949#endif
ac27a0ec
DK		 950 return &ei->vfs_inode;
951}
952
7ff9c073
TT		 953static int ext4_drop_inode(struct inode *inode)
954{
955 int drop = generic_drop_inode(inode);
956
957 trace_ext4_drop_inode(inode, drop);
958 return drop;
959}
960
fa0d7e3d
NP		 961static void ext4_i_callback(struct rcu_head *head)
962{
963 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 964 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
965}
966
617ba13b 967static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 968{
9f7dd93d 969 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 970 ext4_msg(inode->i_sb, KERN_ERR,
971 "Inode %lu (%p): orphan list check failed!",
972 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 973 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
974 EXT4_I(inode), sizeof(struct ext4_inode_info),
975 true);
976 dump_stack();
977 }
fa0d7e3d 978 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 979}
980
51cc5068 981static void init_once(void *foo)
ac27a0ec 982{
617ba13b 983 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 984
a35afb83 985 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 986 init_rwsem(&ei->xattr_sem);
0e855ac8 987 init_rwsem(&ei->i_data_sem);
ea3d7209 988 init_rwsem(&ei->i_mmap_sem);
a35afb83 989 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 990}
991
e67bc2b3 992static int __init init_inodecache(void)
ac27a0ec 993{
617ba13b
MC		 994 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
995 sizeof(struct ext4_inode_info),
ac27a0ec 996 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 997 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 998 init_once);
617ba13b 999 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1000 return -ENOMEM;
1001 return 0;
1002}
1003
1004static void destroy_inodecache(void)
1005{
8c0a8537
KS		 1006 /*
1007 * Make sure all delayed rcu free inodes are flushed before we
1008 * destroy cache.
1009 */
1010 rcu_barrier();
617ba13b 1011 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1012}
1013
0930fcc1 1014void ext4_clear_inode(struct inode *inode)
ac27a0ec 1015{
0930fcc1 1016 invalidate_inode_buffers(inode);
dbd5768f 1017 clear_inode(inode);
9f754758 1018 dquot_drop(inode);
c2ea3fde 1019 ext4_discard_preallocations(inode);
51865fda 1020 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1021 if (EXT4_I(inode)->jinode) {
1022 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1023 EXT4_I(inode)->jinode);
1024 jbd2_free_inode(EXT4_I(inode)->jinode);
1025 EXT4_I(inode)->jinode = NULL;
1026 }
b7236e21
TT		 1027#ifdef CONFIG_EXT4_FS_ENCRYPTION
1028 if (EXT4_I(inode)->i_crypt_info)
c936e1ec 1029 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
b7236e21 1030#endif
ac27a0ec
DK		 1031}
1032
1b961ac0 1033static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1034 u64 ino, u32 generation)
ac27a0ec 1035{
ac27a0ec 1036 struct inode *inode;
ac27a0ec 1037
617ba13b 1038 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1039 return ERR_PTR(-ESTALE);
617ba13b 1040 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1041 return ERR_PTR(-ESTALE);
1042
1043 /* iget isn't really right if the inode is currently unallocated!!
1044 *
617ba13b 1045 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1046 * deleted, so we should be safe.
1047 *
1048 * Currently we don't know the generation for parent directory, so
1049 * a generation of 0 means "accept any"
1050 */
f4bb2981 1051 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1052 if (IS_ERR(inode))
1053 return ERR_CAST(inode);
1054 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1055 iput(inode);
1056 return ERR_PTR(-ESTALE);
1057 }
1b961ac0
CH		 1058
1059 return inode;
1060}
1061
1062static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1063 int fh_len, int fh_type)
1b961ac0
CH		 1064{
1065 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1066 ext4_nfs_get_inode);
1067}
1068
1069static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1070 int fh_len, int fh_type)
1b961ac0
CH		 1071{
1072 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1073 ext4_nfs_get_inode);
ac27a0ec
DK		 1074}
1075
c39a7f84
TO		 1076/*
1077 * Try to release metadata pages (indirect blocks, directories) which are
1078 * mapped via the block device. Since these pages could have journal heads
1079 * which would prevent try_to_free_buffers() from freeing them, we must use
1080 * jbd2 layer's try_to_free_buffers() function to release them.
1081 */
0b8e58a1
AD		 1082static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1083 gfp_t wait)
c39a7f84
TO		 1084{
1085 journal_t *journal = EXT4_SB(sb)->s_journal;
1086
1087 WARN_ON(PageChecked(page));
1088 if (!page_has_buffers(page))
1089 return 0;
1090 if (journal)
1091 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1092 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1093 return try_to_free_buffers(page);
1094}
1095
ac27a0ec 1096#ifdef CONFIG_QUOTA
689c958c
LX		 1097static char *quotatypes[] = INITQFNAMES;
1098#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1099
617ba13b
MC		 1100static int ext4_write_dquot(struct dquot *dquot);
1101static int ext4_acquire_dquot(struct dquot *dquot);
1102static int ext4_release_dquot(struct dquot *dquot);
1103static int ext4_mark_dquot_dirty(struct dquot *dquot);
1104static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1105static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1106 struct path *path);
ca0e05e4 1107static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1108static int ext4_quota_on_mount(struct super_block *sb, int type);
1109static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1110 size_t len, loff_t off);
617ba13b 1111static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1112 const char *data, size_t len, loff_t off);
7c319d32
AK		 1113static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1114 unsigned int flags);
1115static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1116static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1117
96c7e0d9
JK		 1118static struct dquot **ext4_get_dquots(struct inode *inode)
1119{
1120 return EXT4_I(inode)->i_dquot;
1121}
1122
61e225dc 1123static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1124 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1125 .write_dquot = ext4_write_dquot,
1126 .acquire_dquot = ext4_acquire_dquot,
1127 .release_dquot = ext4_release_dquot,
1128 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1129 .write_info = ext4_write_info,
1130 .alloc_dquot = dquot_alloc,
1131 .destroy_dquot = dquot_destroy,
040cb378 1132 .get_projid = ext4_get_projid,
8f0e8746 1133 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1134};
1135
0d54b217 1136static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1137 .quota_on = ext4_quota_on,
ca0e05e4 1138 .quota_off = ext4_quota_off,
287a8095 1139 .quota_sync = dquot_quota_sync,
0a240339 1140 .get_state = dquot_get_state,
287a8095
CH		 1141 .set_info = dquot_set_dqinfo,
1142 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1143 .set_dqblk = dquot_set_dqblk,
1144 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1145};
1146#endif
1147
ee9b6d61 1148static const struct super_operations ext4_sops = {
617ba13b
MC		 1149 .alloc_inode = ext4_alloc_inode,
1150 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1151 .write_inode = ext4_write_inode,
1152 .dirty_inode = ext4_dirty_inode,
7ff9c073 1153 .drop_inode = ext4_drop_inode,
0930fcc1 1154 .evict_inode = ext4_evict_inode,
617ba13b 1155 .put_super = ext4_put_super,
617ba13b 1156 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1157 .freeze_fs = ext4_freeze,
1158 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1159 .statfs = ext4_statfs,
1160 .remount_fs = ext4_remount,
617ba13b 1161 .show_options = ext4_show_options,
ac27a0ec 1162#ifdef CONFIG_QUOTA
617ba13b
MC		 1163 .quota_read = ext4_quota_read,
1164 .quota_write = ext4_quota_write,
96c7e0d9 1165 .get_dquots = ext4_get_dquots,
ac27a0ec 1166#endif
c39a7f84 1167 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1168};
1169
39655164 1170static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1171 .fh_to_dentry = ext4_fh_to_dentry,
1172 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1173 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1174};
1175
1176enum {
1177 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1178 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1179 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1180 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1181 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1182 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1183 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1184 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1185 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1186 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1187 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1188 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1189 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1190 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1191 Opt_lazytime, Opt_nolazytime,
1449032b 1192 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1193 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1194 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1195 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1196 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1197};
1198
a447c093 1199static const match_table_t tokens = {
ac27a0ec
DK		 1200 {Opt_bsd_df, "bsddf"},
1201 {Opt_minix_df, "minixdf"},
1202 {Opt_grpid, "grpid"},
1203 {Opt_grpid, "bsdgroups"},
1204 {Opt_nogrpid, "nogrpid"},
1205 {Opt_nogrpid, "sysvgroups"},
1206 {Opt_resgid, "resgid=%u"},
1207 {Opt_resuid, "resuid=%u"},
1208 {Opt_sb, "sb=%u"},
1209 {Opt_err_cont, "errors=continue"},
1210 {Opt_err_panic, "errors=panic"},
1211 {Opt_err_ro, "errors=remount-ro"},
1212 {Opt_nouid32, "nouid32"},
ac27a0ec 1213 {Opt_debug, "debug"},
72578c33
TT		 1214 {Opt_removed, "oldalloc"},
1215 {Opt_removed, "orlov"},
ac27a0ec
DK		 1216 {Opt_user_xattr, "user_xattr"},
1217 {Opt_nouser_xattr, "nouser_xattr"},
1218 {Opt_acl, "acl"},
1219 {Opt_noacl, "noacl"},
e3bb52ae 1220 {Opt_noload, "norecovery"},
5a916be1 1221 {Opt_noload, "noload"},
72578c33
TT		 1222 {Opt_removed, "nobh"},
1223 {Opt_removed, "bh"},
ac27a0ec 1224 {Opt_commit, "commit=%u"},
30773840
TT		 1225 {Opt_min_batch_time, "min_batch_time=%u"},
1226 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1227 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1228 {Opt_journal_path, "journal_path=%s"},
818d276c 1229 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1230 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1231 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1232 {Opt_abort, "abort"},
1233 {Opt_data_journal, "data=journal"},
1234 {Opt_data_ordered, "data=ordered"},
1235 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1236 {Opt_data_err_abort, "data_err=abort"},
1237 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1238 {Opt_offusrjquota, "usrjquota="},
1239 {Opt_usrjquota, "usrjquota=%s"},
1240 {Opt_offgrpjquota, "grpjquota="},
1241 {Opt_grpjquota, "grpjquota=%s"},
1242 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1243 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1244 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1245 {Opt_grpquota, "grpquota"},
1246 {Opt_noquota, "noquota"},
1247 {Opt_quota, "quota"},
1248 {Opt_usrquota, "usrquota"},
1249 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1250 {Opt_barrier, "barrier"},
1251 {Opt_nobarrier, "nobarrier"},
25ec56b5 1252 {Opt_i_version, "i_version"},
923ae0ff 1253 {Opt_dax, "dax"},
c9de560d 1254 {Opt_stripe, "stripe=%u"},
64769240 1255 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1256 {Opt_lazytime, "lazytime"},
1257 {Opt_nolazytime, "nolazytime"},
dd919b98 1258 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1259 {Opt_removed, "mblk_io_submit"},
1260 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1261 {Opt_block_validity, "block_validity"},
1262 {Opt_noblock_validity, "noblock_validity"},
240799cd 1263 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1264 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1265 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1266 {Opt_auto_da_alloc, "auto_da_alloc"},
1267 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1268 {Opt_dioread_nolock, "dioread_nolock"},
1269 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1270 {Opt_discard, "discard"},
1271 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1272 {Opt_init_itable, "init_itable=%u"},
1273 {Opt_init_itable, "init_itable"},
1274 {Opt_noinit_itable, "noinit_itable"},
df981d03 1275 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1276 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1277 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1278 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1279 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1280 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1281 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1282 {Opt_err, NULL},
ac27a0ec
DK		 1283};
1284
617ba13b 1285static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1286{
617ba13b 1287 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1288 char *options = (char *) *data;
1289
1290 if (!options || strncmp(options, "sb=", 3) != 0)
1291 return 1; /* Default location */
0b8e58a1 1292
ac27a0ec 1293 options += 3;
0b8e58a1 1294 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1295 sb_block = simple_strtoul(options, &options, 0);
1296 if (*options && *options != ',') {
4776004f 1297 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1298 (char *) *data);
1299 return 1;
1300 }
1301 if (*options == ',')
1302 options++;
1303 *data = (void *) options;
0b8e58a1 1304
ac27a0ec
DK		 1305 return sb_block;
1306}
1307
b3881f74 1308#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1309static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1310 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1311
56c50f11
DM		 1312#ifdef CONFIG_QUOTA
1313static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1314{
1315 struct ext4_sb_info *sbi = EXT4_SB(sb);
1316 char *qname;
03dafb5f 1317 int ret = -1;
56c50f11
DM		 1318
1319 if (sb_any_quota_loaded(sb) &&
1320 !sbi->s_qf_names[qtype]) {
1321 ext4_msg(sb, KERN_ERR,
1322 "Cannot change journaled "
1323 "quota options when quota turned on");
57f73c2c 1324 return -1;
56c50f11 1325 }
e2b911c5 1326 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1327 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1328 "ignored when QUOTA feature is enabled");
1329 return 1;
262b4662 1330 }
56c50f11
DM		 1331 qname = match_strdup(args);
1332 if (!qname) {
1333 ext4_msg(sb, KERN_ERR,
1334 "Not enough memory for storing quotafile name");
57f73c2c 1335 return -1;
56c50f11 1336 }
03dafb5f
CG		 1337 if (sbi->s_qf_names[qtype]) {
1338 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1339 ret = 1;
1340 else
1341 ext4_msg(sb, KERN_ERR,
1342 "%s quota file already specified",
1343 QTYPE2NAME(qtype));
1344 goto errout;
56c50f11 1345 }
03dafb5f 1346 if (strchr(qname, '/')) {
56c50f11
DM		 1347 ext4_msg(sb, KERN_ERR,
1348 "quotafile must be on filesystem root");
03dafb5f 1349 goto errout;
56c50f11 1350 }
03dafb5f 1351 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1352 set_opt(sb, QUOTA);
56c50f11 1353 return 1;
03dafb5f
CG		 1354errout:
1355 kfree(qname);
1356 return ret;
56c50f11
DM		 1357}
1358
1359static int clear_qf_name(struct super_block *sb, int qtype)
1360{
1361
1362 struct ext4_sb_info *sbi = EXT4_SB(sb);
1363
1364 if (sb_any_quota_loaded(sb) &&
1365 sbi->s_qf_names[qtype]) {
1366 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1367 " when quota turned on");
57f73c2c 1368 return -1;
56c50f11 1369 }
03dafb5f 1370 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1371 sbi->s_qf_names[qtype] = NULL;
1372 return 1;
1373}
1374#endif
1375
26092bf5
TT		 1376#define MOPT_SET 0x0001
1377#define MOPT_CLEAR 0x0002
1378#define MOPT_NOSUPPORT 0x0004
1379#define MOPT_EXPLICIT 0x0008
1380#define MOPT_CLEAR_ERR 0x0010
1381#define MOPT_GTE0 0x0020
ac27a0ec 1382#ifdef CONFIG_QUOTA
26092bf5
TT		 1383#define MOPT_Q 0
1384#define MOPT_QFMT 0x0040
1385#else
1386#define MOPT_Q MOPT_NOSUPPORT
1387#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1388#endif
26092bf5 1389#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1390#define MOPT_NO_EXT2 0x0100
1391#define MOPT_NO_EXT3 0x0200
1392#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1393#define MOPT_STRING 0x0400
26092bf5
TT		 1394
1395static const struct mount_opts {
1396 int token;
1397 int mount_opt;
1398 int flags;
1399} ext4_mount_opts[] = {
1400 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1401 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1402 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1403 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1404 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1405 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1406 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1407 MOPT_EXT4_ONLY | MOPT_SET},
1408 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1409 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1410 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1411 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1412 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1413 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1414 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1415 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1416 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1417 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1418 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1419 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1420 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1421 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1422 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1423 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1424 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1425 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1426 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1427 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1428 MOPT_NO_EXT2},
8dc0aa8c 1429 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1430 MOPT_NO_EXT2},
26092bf5
TT		 1431 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1432 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1433 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1434 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1435 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1436 {Opt_commit, 0, MOPT_GTE0},
1437 {Opt_max_batch_time, 0, MOPT_GTE0},
1438 {Opt_min_batch_time, 0, MOPT_GTE0},
1439 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1440 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1441 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1442 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1443 {Opt_resuid, 0, MOPT_GTE0},
1444 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1445 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1446 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1447 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1448 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1449 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1450 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1451 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1452 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1453 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1454#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1455 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1456 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1457#else
26092bf5
TT		 1458 {Opt_acl, 0, MOPT_NOSUPPORT},
1459 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1460#endif
26092bf5
TT		 1461 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1462 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1463 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1464 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1465 MOPT_SET | MOPT_Q},
1466 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1467 MOPT_SET | MOPT_Q},
1468 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1469 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1470 {Opt_usrjquota, 0, MOPT_Q},
1471 {Opt_grpjquota, 0, MOPT_Q},
1472 {Opt_offusrjquota, 0, MOPT_Q},
1473 {Opt_offgrpjquota, 0, MOPT_Q},
1474 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1475 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1476 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1477 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1478 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1479 {Opt_err, 0, 0}
1480};
1481
1482static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1483 substring_t *args, unsigned long *journal_devnum,
1484 unsigned int *journal_ioprio, int is_remount)
1485{
1486 struct ext4_sb_info *sbi = EXT4_SB(sb);
1487 const struct mount_opts *m;
08cefc7a
EB		 1488 kuid_t uid;
1489 kgid_t gid;
26092bf5
TT		 1490 int arg = 0;
1491
57f73c2c
TT		 1492#ifdef CONFIG_QUOTA
1493 if (token == Opt_usrjquota)
1494 return set_qf_name(sb, USRQUOTA, &args[0]);
1495 else if (token == Opt_grpjquota)
1496 return set_qf_name(sb, GRPQUOTA, &args[0]);
1497 else if (token == Opt_offusrjquota)
1498 return clear_qf_name(sb, USRQUOTA);
1499 else if (token == Opt_offgrpjquota)
1500 return clear_qf_name(sb, GRPQUOTA);
1501#endif
26092bf5 1502 switch (token) {
f7048605
TT		 1503 case Opt_noacl:
1504 case Opt_nouser_xattr:
1505 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1506 break;
26092bf5
TT		 1507 case Opt_sb:
1508 return 1; /* handled by get_sb_block() */
1509 case Opt_removed:
5f3633e3 1510 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1511 return 1;
26092bf5
TT		 1512 case Opt_abort:
1513 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1514 return 1;
1515 case Opt_i_version:
1516 sb->s_flags |= MS_I_VERSION;
1517 return 1;
a26f4992
TT		 1518 case Opt_lazytime:
1519 sb->s_flags |= MS_LAZYTIME;
1520 return 1;
1521 case Opt_nolazytime:
1522 sb->s_flags &= ~MS_LAZYTIME;
1523 return 1;
26092bf5
TT		 1524 }
1525
5f3633e3
JK		 1526 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1527 if (token == m->token)
1528 break;
1529
1530 if (m->token == Opt_err) {
1531 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1532 "or missing value", opt);
1533 return -1;
1534 }
1535
8dc0aa8c
TT		 1536 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1537 ext4_msg(sb, KERN_ERR,
1538 "Mount option \"%s\" incompatible with ext2", opt);
1539 return -1;
1540 }
1541 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1542 ext4_msg(sb, KERN_ERR,
1543 "Mount option \"%s\" incompatible with ext3", opt);
1544 return -1;
1545 }
1546
ad4eec61 1547 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1548 return -1;
1549 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1550 return -1;
c93cf2d7
DM		 1551 if (m->flags & MOPT_EXPLICIT) {
1552 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1553 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1554 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1555 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1556 } else
1557 return -1;
1558 }
5f3633e3
JK		 1559 if (m->flags & MOPT_CLEAR_ERR)
1560 clear_opt(sb, ERRORS_MASK);
1561 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1562 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1563 "options when quota turned on");
1564 return -1;
1565 }
1566
1567 if (m->flags & MOPT_NOSUPPORT) {
1568 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1569 } else if (token == Opt_commit) {
1570 if (arg == 0)
1571 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1572 sbi->s_commit_interval = HZ * arg;
1573 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1574 sbi->s_max_batch_time = arg;
1575 } else if (token == Opt_min_batch_time) {
1576 sbi->s_min_batch_time = arg;
1577 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1578 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1579 ext4_msg(sb, KERN_ERR,
1580 "EXT4-fs: inode_readahead_blks must be "
1581 "0 or a power of 2 smaller than 2^31");
26092bf5 1582 return -1;
5f3633e3
JK		 1583 }
1584 sbi->s_inode_readahead_blks = arg;
1585 } else if (token == Opt_init_itable) {
1586 set_opt(sb, INIT_INODE_TABLE);
1587 if (!args->from)
1588 arg = EXT4_DEF_LI_WAIT_MULT;
1589 sbi->s_li_wait_mult = arg;
1590 } else if (token == Opt_max_dir_size_kb) {
1591 sbi->s_max_dir_size_kb = arg;
1592 } else if (token == Opt_stripe) {
1593 sbi->s_stripe = arg;
1594 } else if (token == Opt_resuid) {
1595 uid = make_kuid(current_user_ns(), arg);
1596 if (!uid_valid(uid)) {
1597 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1598 return -1;
1599 }
5f3633e3
JK		 1600 sbi->s_resuid = uid;
1601 } else if (token == Opt_resgid) {
1602 gid = make_kgid(current_user_ns(), arg);
1603 if (!gid_valid(gid)) {
1604 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1605 return -1;
1606 }
1607 sbi->s_resgid = gid;
1608 } else if (token == Opt_journal_dev) {
1609 if (is_remount) {
1610 ext4_msg(sb, KERN_ERR,
1611 "Cannot specify journal on remount");
1612 return -1;
1613 }
1614 *journal_devnum = arg;
ad4eec61
ES		 1615 } else if (token == Opt_journal_path) {
1616 char *journal_path;
1617 struct inode *journal_inode;
1618 struct path path;
1619 int error;
1620
1621 if (is_remount) {
1622 ext4_msg(sb, KERN_ERR,
1623 "Cannot specify journal on remount");
1624 return -1;
1625 }
1626 journal_path = match_strdup(&args[0]);
1627 if (!journal_path) {
1628 ext4_msg(sb, KERN_ERR, "error: could not dup "
1629 "journal device string");
1630 return -1;
1631 }
1632
1633 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1634 if (error) {
1635 ext4_msg(sb, KERN_ERR, "error: could not find "
1636 "journal device path: error %d", error);
1637 kfree(journal_path);
1638 return -1;
1639 }
1640
2b0143b5 1641 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1642 if (!S_ISBLK(journal_inode->i_mode)) {
1643 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1644 "is not a block device", journal_path);
1645 path_put(&path);
1646 kfree(journal_path);
1647 return -1;
1648 }
1649
1650 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1651 path_put(&path);
1652 kfree(journal_path);
5f3633e3
JK		 1653 } else if (token == Opt_journal_ioprio) {
1654 if (arg > 7) {
1655 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1656 " (must be 0-7)");
1657 return -1;
1658 }
1659 *journal_ioprio =
1660 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1661 } else if (token == Opt_test_dummy_encryption) {
1662#ifdef CONFIG_EXT4_FS_ENCRYPTION
1663 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1664 ext4_msg(sb, KERN_WARNING,
1665 "Test dummy encryption mode enabled");
1666#else
1667 ext4_msg(sb, KERN_WARNING,
1668 "Test dummy encryption mount option ignored");
1669#endif
5f3633e3
JK		 1670 } else if (m->flags & MOPT_DATAJ) {
1671 if (is_remount) {
1672 if (!sbi->s_journal)
1673 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1674 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1675 ext4_msg(sb, KERN_ERR,
26092bf5 1676 "Cannot change data mode on remount");
26092bf5 1677 return -1;
ac27a0ec 1678 }
26092bf5 1679 } else {
5f3633e3
JK		 1680 clear_opt(sb, DATA_FLAGS);
1681 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1682 }
5f3633e3
JK		 1683#ifdef CONFIG_QUOTA
1684 } else if (m->flags & MOPT_QFMT) {
1685 if (sb_any_quota_loaded(sb) &&
1686 sbi->s_jquota_fmt != m->mount_opt) {
1687 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1688 "quota options when quota turned on");
1689 return -1;
1690 }
e2b911c5 1691 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1692 ext4_msg(sb, KERN_INFO,
1693 "Quota format mount options ignored "
262b4662 1694 "when QUOTA feature is enabled");
c325a67c 1695 return 1;
262b4662 1696 }
5f3633e3 1697 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1698#endif
923ae0ff 1699 } else if (token == Opt_dax) {
ef83b6e8
DW		 1700#ifdef CONFIG_FS_DAX
1701 ext4_msg(sb, KERN_WARNING,
1702 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1703 sbi->s_mount_opt |= m->mount_opt;
1704#else
923ae0ff
RZ		 1705 ext4_msg(sb, KERN_INFO, "dax option not supported");
1706 return -1;
5f3633e3 1707#endif
7915a861
AN		 1708 } else if (token == Opt_data_err_abort) {
1709 sbi->s_mount_opt |= m->mount_opt;
1710 } else if (token == Opt_data_err_ignore) {
1711 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1712 } else {
1713 if (!args->from)
1714 arg = 1;
1715 if (m->flags & MOPT_CLEAR)
1716 arg = !arg;
1717 else if (unlikely(!(m->flags & MOPT_SET))) {
1718 ext4_msg(sb, KERN_WARNING,
1719 "buggy handling of option %s", opt);
1720 WARN_ON(1);
1721 return -1;
1722 }
1723 if (arg != 0)
1724 sbi->s_mount_opt |= m->mount_opt;
1725 else
1726 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1727 }
5f3633e3 1728 return 1;
26092bf5
TT		 1729}
1730
1731static int parse_options(char *options, struct super_block *sb,
1732 unsigned long *journal_devnum,
1733 unsigned int *journal_ioprio,
1734 int is_remount)
1735{
1736 struct ext4_sb_info *sbi = EXT4_SB(sb);
1737 char *p;
1738 substring_t args[MAX_OPT_ARGS];
1739 int token;
1740
1741 if (!options)
1742 return 1;
1743
1744 while ((p = strsep(&options, ",")) != NULL) {
1745 if (!*p)
1746 continue;
1747 /*
1748 * Initialize args struct so we know whether arg was
1749 * found; some options take optional arguments.
1750 */
caecd0af 1751 args[0].to = args[0].from = NULL;
26092bf5
TT		 1752 token = match_token(p, tokens, args);
1753 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1754 journal_ioprio, is_remount) < 0)
1755 return 0;
ac27a0ec
DK		 1756 }
1757#ifdef CONFIG_QUOTA
e2b911c5 1758 if (ext4_has_feature_quota(sb) &&
262b4662 1759 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
c325a67c
TT		 1760 ext4_msg(sb, KERN_INFO, "Quota feature enabled, usrquota and grpquota "
1761 "mount options ignored.");
1762 clear_opt(sb, USRQUOTA);
1763 clear_opt(sb, GRPQUOTA);
1764 } else if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1765 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1766 clear_opt(sb, USRQUOTA);
ac27a0ec 1767
482a7425 1768 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1769 clear_opt(sb, GRPQUOTA);
ac27a0ec 1770
56c50f11 1771 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1772 ext4_msg(sb, KERN_ERR, "old and new quota "
1773 "format mixing");
ac27a0ec
DK		 1774 return 0;
1775 }
1776
1777 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1778 ext4_msg(sb, KERN_ERR, "journaled quota format "
1779 "not specified");
ac27a0ec
DK		 1780 return 0;
1781 }
ac27a0ec
DK		 1782 }
1783#endif
261cb20c
JK		 1784 if (test_opt(sb, DIOREAD_NOLOCK)) {
1785 int blocksize =
1786 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1787
09cbfeaf 1788 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 1789 ext4_msg(sb, KERN_ERR, "can't mount with "
1790 "dioread_nolock if block size != PAGE_SIZE");
1791 return 0;
1792 }
1793 }
d4f76107
JK		 1794 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1795 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1796 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1797 "in data=ordered mode");
1798 return 0;
1799 }
ac27a0ec
DK		 1800 return 1;
1801}
1802
2adf6da8
TT		 1803static inline void ext4_show_quota_options(struct seq_file *seq,
1804 struct super_block *sb)
1805{
1806#if defined(CONFIG_QUOTA)
1807 struct ext4_sb_info *sbi = EXT4_SB(sb);
1808
1809 if (sbi->s_jquota_fmt) {
1810 char *fmtname = "";
1811
1812 switch (sbi->s_jquota_fmt) {
1813 case QFMT_VFS_OLD:
1814 fmtname = "vfsold";
1815 break;
1816 case QFMT_VFS_V0:
1817 fmtname = "vfsv0";
1818 break;
1819 case QFMT_VFS_V1:
1820 fmtname = "vfsv1";
1821 break;
1822 }
1823 seq_printf(seq, ",jqfmt=%s", fmtname);
1824 }
1825
1826 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1827 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1828
1829 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1830 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1831#endif
1832}
1833
5a916be1
TT		 1834static const char *token2str(int token)
1835{
50df9fd5 1836 const struct match_token *t;
5a916be1
TT		 1837
1838 for (t = tokens; t->token != Opt_err; t++)
1839 if (t->token == token && !strchr(t->pattern, '='))
1840 break;
1841 return t->pattern;
1842}
1843
2adf6da8
TT		 1844/*
1845 * Show an option if
1846 * - it's set to a non-default value OR
1847 * - if the per-sb default is different from the global default
1848 */
66acdcf4
TT		 1849static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1850 int nodefs)
2adf6da8 1851{
2adf6da8
TT		 1852 struct ext4_sb_info *sbi = EXT4_SB(sb);
1853 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1854 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1855 const struct mount_opts *m;
66acdcf4 1856 char sep = nodefs ? '\n' : ',';
2adf6da8 1857
66acdcf4
TT		 1858#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1859#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1860
1861 if (sbi->s_sb_block != 1)
5a916be1
TT		 1862 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1863
1864 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1865 int want_set = m->flags & MOPT_SET;
1866 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1867 (m->flags & MOPT_CLEAR_ERR))
1868 continue;
66acdcf4 1869 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1870 continue; /* skip if same as the default */
1871 if ((want_set &&
1872 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1873 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1874 continue; /* select Opt_noFoo vs Opt_Foo */
1875 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1876 }
5a916be1 1877
08cefc7a 1878 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1879 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1880 SEQ_OPTS_PRINT("resuid=%u",
1881 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1882 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1883 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1884 SEQ_OPTS_PRINT("resgid=%u",
1885 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1886 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1887 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1888 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1889 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1890 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1891 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1892 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1893 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1894 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1895 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1896 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1897 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1898 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1899 if (sb->s_flags & MS_I_VERSION)
5a916be1 1900 SEQ_OPTS_PUTS("i_version");
66acdcf4 1901 if (nodefs || sbi->s_stripe)
5a916be1 1902 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1903 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1904 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1905 SEQ_OPTS_PUTS("data=journal");
1906 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1907 SEQ_OPTS_PUTS("data=ordered");
1908 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1909 SEQ_OPTS_PUTS("data=writeback");
1910 }
66acdcf4
TT		 1911 if (nodefs ||
1912 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1913 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1914 sbi->s_inode_readahead_blks);
2adf6da8 1915
66acdcf4
TT		 1916 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1917 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1918 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1919 if (nodefs || sbi->s_max_dir_size_kb)
1920 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 1921 if (test_opt(sb, DATA_ERR_ABORT))
1922 SEQ_OPTS_PUTS("data_err=abort");
2adf6da8
TT		 1923
1924 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1925 return 0;
1926}
1927
66acdcf4
TT		 1928static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1929{
1930 return _ext4_show_options(seq, root->d_sb, 0);
1931}
1932
ebd173be 1933int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1934{
1935 struct super_block *sb = seq->private;
1936 int rc;
1937
1938 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1939 rc = _ext4_show_options(seq, sb, 1);
1940 seq_puts(seq, "\n");
1941 return rc;
1942}
1943
617ba13b 1944static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1945 int read_only)
1946{
617ba13b 1947 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1948 int res = 0;
1949
617ba13b 1950 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1951 ext4_msg(sb, KERN_ERR, "revision level too high, "
1952 "forcing read-only mode");
ac27a0ec
DK		 1953 res = MS_RDONLY;
1954 }
1955 if (read_only)
281b5995 1956 goto done;
617ba13b 1957 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1958 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1959 "running e2fsck is recommended");
c8b459f4 1960 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1961 ext4_msg(sb, KERN_WARNING,
1962 "warning: mounting fs with errors, "
1963 "running e2fsck is recommended");
ed3ce80a 1964 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1965 le16_to_cpu(es->s_mnt_count) >=
1966 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1967 ext4_msg(sb, KERN_WARNING,
1968 "warning: maximal mount count reached, "
1969 "running e2fsck is recommended");
ac27a0ec
DK		 1970 else if (le32_to_cpu(es->s_checkinterval) &&
1971 (le32_to_cpu(es->s_lastcheck) +
1972 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1973 ext4_msg(sb, KERN_WARNING,
1974 "warning: checktime reached, "
1975 "running e2fsck is recommended");
0b8e58a1 1976 if (!sbi->s_journal)
0390131b 1977 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1978 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1979 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1980 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1981 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1982 ext4_update_dynamic_rev(sb);
0390131b 1983 if (sbi->s_journal)
e2b911c5 1984 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 1985
e2d67052 1986 ext4_commit_super(sb, 1);
281b5995 1987done:
ac27a0ec 1988 if (test_opt(sb, DEBUG))
a9df9a49 1989 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1990 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1991 sb->s_blocksize,
1992 sbi->s_groups_count,
617ba13b
MC		 1993 EXT4_BLOCKS_PER_GROUP(sb),
1994 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1995 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1996
7abc52c2 1997 cleancache_init_fs(sb);
ac27a0ec
DK		 1998 return res;
1999}
2000
117fff10
TT		 2001int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2002{
2003 struct ext4_sb_info *sbi = EXT4_SB(sb);
2004 struct flex_groups *new_groups;
2005 int size;
2006
2007 if (!sbi->s_log_groups_per_flex)
2008 return 0;
2009
2010 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2011 if (size <= sbi->s_flex_groups_allocated)
2012 return 0;
2013
2014 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2015 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2016 if (!new_groups) {
2017 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2018 size / (int) sizeof(struct flex_groups));
2019 return -ENOMEM;
2020 }
2021
2022 if (sbi->s_flex_groups) {
2023 memcpy(new_groups, sbi->s_flex_groups,
2024 (sbi->s_flex_groups_allocated *
2025 sizeof(struct flex_groups)));
b93b41d4 2026 kvfree(sbi->s_flex_groups);
117fff10
TT		 2027 }
2028 sbi->s_flex_groups = new_groups;
2029 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2030 return 0;
2031}
2032
772cb7c8
JS		 2033static int ext4_fill_flex_info(struct super_block *sb)
2034{
2035 struct ext4_sb_info *sbi = EXT4_SB(sb);
2036 struct ext4_group_desc *gdp = NULL;
772cb7c8 2037 ext4_group_t flex_group;
117fff10 2038 int i, err;
772cb7c8 2039
503358ae 2040 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2041 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2042 sbi->s_log_groups_per_flex = 0;
2043 return 1;
2044 }
2045
117fff10
TT		 2046 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2047 if (err)
9933fc0a 2048 goto failed;
772cb7c8 2049
772cb7c8 2050 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2051 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2052
2053 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2054 atomic_add(ext4_free_inodes_count(sb, gdp),
2055 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2056 atomic64_add(ext4_free_group_clusters(sb, gdp),
2057 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2058 atomic_add(ext4_used_dirs_count(sb, gdp),
2059 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2060 }
2061
2062 return 1;
2063failed:
2064 return 0;
2065}
2066
e2b911c5 2067static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2068 struct ext4_group_desc *gdp)
717d50e4 2069{
feb0ab32 2070 int offset;
717d50e4 2071 __u16 crc = 0;
feb0ab32 2072 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2073 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2074
9aa5d32b 2075 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2076 /* Use new metadata_csum algorithm */
d6a77105 2077 __le16 save_csum;
feb0ab32
DW		 2078 __u32 csum32;
2079
d6a77105 2080 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2081 gdp->bg_checksum = 0;
2082 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2083 sizeof(le_group));
2084 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2085 sbi->s_desc_size);
d6a77105 2086 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2087
2088 crc = csum32 & 0xFFFF;
2089 goto out;
717d50e4
AD		 2090 }
2091
feb0ab32 2092 /* old crc16 code */
e2b911c5 2093 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2094 return 0;
2095
feb0ab32
DW		 2096 offset = offsetof(struct ext4_group_desc, bg_checksum);
2097
2098 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2099 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2100 crc = crc16(crc, (__u8 *)gdp, offset);
2101 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2102 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2103 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2104 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2105 crc = crc16(crc, (__u8 *)gdp + offset,
2106 le16_to_cpu(sbi->s_es->s_desc_size) -
2107 offset);
2108
2109out:
717d50e4
AD		 2110 return cpu_to_le16(crc);
2111}
2112
feb0ab32 2113int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2114 struct ext4_group_desc *gdp)
2115{
feb0ab32 2116 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2117 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2118 return 0;
2119
2120 return 1;
2121}
2122
feb0ab32
DW		 2123void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2124 struct ext4_group_desc *gdp)
2125{
2126 if (!ext4_has_group_desc_csum(sb))
2127 return;
e2b911c5 2128 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2129}
2130
ac27a0ec 2131/* Called at mount-time, super-block is locked */
bfff6873
LC		 2132static int ext4_check_descriptors(struct super_block *sb,
2133 ext4_group_t *first_not_zeroed)
ac27a0ec 2134{
617ba13b
MC		 2135 struct ext4_sb_info *sbi = EXT4_SB(sb);
2136 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2137 ext4_fsblk_t last_block;
bd81d8ee
LV		 2138 ext4_fsblk_t block_bitmap;
2139 ext4_fsblk_t inode_bitmap;
2140 ext4_fsblk_t inode_table;
ce421581 2141 int flexbg_flag = 0;
bfff6873 2142 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2143
e2b911c5 2144 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2145 flexbg_flag = 1;
2146
af5bc92d 2147 ext4_debug("Checking group descriptors");
ac27a0ec 2148
197cd65a
AM		 2149 for (i = 0; i < sbi->s_groups_count; i++) {
2150 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2151
ce421581 2152 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2153 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2154 else
2155 last_block = first_block +
617ba13b 2156 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2157
bfff6873
LC		 2158 if ((grp == sbi->s_groups_count) &&
2159 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2160 grp = i;
2161
8fadc143 2162 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2163 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2164 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2165 "Block bitmap for group %u not in group "
b31e1552 2166 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2167 return 0;
2168 }
8fadc143 2169 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2170 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2171 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2172 "Inode bitmap for group %u not in group "
b31e1552 2173 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2174 return 0;
2175 }
8fadc143 2176 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2177 if (inode_table < first_block ||
2b2d6d01 2178 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2179 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2180 "Inode table for group %u not in group "
b31e1552 2181 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2182 return 0;
2183 }
955ce5f5 2184 ext4_lock_group(sb, i);
feb0ab32 2185 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2186 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2187 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2188 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2189 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2190 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2191 ext4_unlock_group(sb, i);
8a266467 2192 return 0;
7ee1ec4c 2193 }
717d50e4 2194 }
955ce5f5 2195 ext4_unlock_group(sb, i);
ce421581
JS		 2196 if (!flexbg_flag)
2197 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2198 }
bfff6873
LC		 2199 if (NULL != first_not_zeroed)
2200 *first_not_zeroed = grp;
ac27a0ec
DK		 2201 return 1;
2202}
2203
617ba13b 2204/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2205 * the superblock) which were deleted from all directories, but held open by
2206 * a process at the time of a crash. We walk the list and try to delete these
2207 * inodes at recovery time (only with a read-write filesystem).
2208 *
2209 * In order to keep the orphan inode chain consistent during traversal (in
2210 * case of crash during recovery), we link each inode into the superblock
2211 * orphan list_head and handle it the same way as an inode deletion during
2212 * normal operation (which journals the operations for us).
2213 *
2214 * We only do an iget() and an iput() on each inode, which is very safe if we
2215 * accidentally point at an in-use or already deleted inode. The worst that
2216 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2217 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2218 * e2fsck was run on this filesystem, and it must have already done the orphan
2219 * inode cleanup for us, so we can safely abort without any further action.
2220 */
2b2d6d01
TT		 2221static void ext4_orphan_cleanup(struct super_block *sb,
2222 struct ext4_super_block *es)
ac27a0ec
DK		 2223{
2224 unsigned int s_flags = sb->s_flags;
2225 int nr_orphans = 0, nr_truncates = 0;
2226#ifdef CONFIG_QUOTA
2227 int i;
2228#endif
2229 if (!es->s_last_orphan) {
2230 jbd_debug(4, "no orphan inodes to clean up\n");
2231 return;
2232 }
2233
a8f48a95 2234 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2235 ext4_msg(sb, KERN_ERR, "write access "
2236 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2237 return;
2238 }
2239
d39195c3
AG		 2240 /* Check if feature set would not allow a r/w mount */
2241 if (!ext4_feature_set_ok(sb, 0)) {
2242 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2243 "unknown ROCOMPAT features");
2244 return;
2245 }
2246
617ba13b 2247 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2248 /* don't clear list on RO mount w/ errors */
2249 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2250 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2251 "clearing orphan list.\n");
c25f9bc6
ES		 2252 es->s_last_orphan = 0;
2253 }
ac27a0ec
DK		 2254 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2255 return;
2256 }
2257
2258 if (s_flags & MS_RDONLY) {
b31e1552 2259 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2260 sb->s_flags &= ~MS_RDONLY;
2261 }
2262#ifdef CONFIG_QUOTA
2263 /* Needed for iput() to work correctly and not trash data */
2264 sb->s_flags |= MS_ACTIVE;
2265 /* Turn on quotas so that they are updated correctly */
a2d4a646 2266 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2267 if (EXT4_SB(sb)->s_qf_names[i]) {
2268 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2269 if (ret < 0)
b31e1552
ES		 2270 ext4_msg(sb, KERN_ERR,
2271 "Cannot turn on journaled "
2272 "quota: error %d", ret);
ac27a0ec
DK		 2273 }
2274 }
2275#endif
2276
2277 while (es->s_last_orphan) {
2278 struct inode *inode;
2279
97bd42b9
JB		 2280 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2281 if (IS_ERR(inode)) {
ac27a0ec
DK		 2282 es->s_last_orphan = 0;
2283 break;
2284 }
2285
617ba13b 2286 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2287 dquot_initialize(inode);
ac27a0ec 2288 if (inode->i_nlink) {
566370a2
PT		 2289 if (test_opt(sb, DEBUG))
2290 ext4_msg(sb, KERN_DEBUG,
2291 "%s: truncating inode %lu to %lld bytes",
2292 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2293 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2294 inode->i_ino, inode->i_size);
5955102c 2295 inode_lock(inode);
55f252c9 2296 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2297 ext4_truncate(inode);
5955102c 2298 inode_unlock(inode);
ac27a0ec
DK		 2299 nr_truncates++;
2300 } else {
566370a2
PT		 2301 if (test_opt(sb, DEBUG))
2302 ext4_msg(sb, KERN_DEBUG,
2303 "%s: deleting unreferenced inode %lu",
2304 __func__, inode->i_ino);
ac27a0ec
DK		 2305 jbd_debug(2, "deleting unreferenced inode %lu\n",
2306 inode->i_ino);
2307 nr_orphans++;
2308 }
2309 iput(inode); /* The delete magic happens here! */
2310 }
2311
2b2d6d01 2312#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2313
2314 if (nr_orphans)
b31e1552
ES		 2315 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2316 PLURAL(nr_orphans));
ac27a0ec 2317 if (nr_truncates)
b31e1552
ES		 2318 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2319 PLURAL(nr_truncates));
ac27a0ec
DK		 2320#ifdef CONFIG_QUOTA
2321 /* Turn quotas off */
a2d4a646 2322 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2323 if (sb_dqopt(sb)->files[i])
287a8095 2324 dquot_quota_off(sb, i);
ac27a0ec
DK		 2325 }
2326#endif
2327 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2328}
0b8e58a1 2329
cd2291a4
ES		 2330/*
2331 * Maximal extent format file size.
2332 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2333 * extent format containers, within a sector_t, and within i_blocks
2334 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2335 * so that won't be a limiting factor.
2336 *
f17722f9
LC		 2337 * However there is other limiting factor. We do store extents in the form
2338 * of starting block and length, hence the resulting length of the extent
2339 * covering maximum file size must fit into on-disk format containers as
2340 * well. Given that length is always by 1 unit bigger than max unit (because
2341 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2342 *
cd2291a4
ES		 2343 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2344 */
f287a1a5 2345static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2346{
2347 loff_t res;
2348 loff_t upper_limit = MAX_LFS_FILESIZE;
2349
2350 /* small i_blocks in vfs inode? */
f287a1a5 2351 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2352 /*
90c699a9 2353 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2354 * i_block represent total blocks in 512 bytes
2355 * 32 == size of vfs inode i_blocks * 8
2356 */
2357 upper_limit = (1LL << 32) - 1;
2358
2359 /* total blocks in file system block size */
2360 upper_limit >>= (blkbits - 9);
2361 upper_limit <<= blkbits;
2362 }
2363
f17722f9
LC		 2364 /*
2365 * 32-bit extent-start container, ee_block. We lower the maxbytes
2366 * by one fs block, so ee_len can cover the extent of maximum file
2367 * size
2368 */
2369 res = (1LL << 32) - 1;
cd2291a4 2370 res <<= blkbits;
cd2291a4
ES		 2371
2372 /* Sanity check against vm- & vfs- imposed limits */
2373 if (res > upper_limit)
2374 res = upper_limit;
2375
2376 return res;
2377}
ac27a0ec 2378
ac27a0ec 2379/*
cd2291a4 2380 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2381 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2382 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2383 */
f287a1a5 2384static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2385{
617ba13b 2386 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2387 int meta_blocks;
2388 loff_t upper_limit;
0b8e58a1
AD		 2389 /* This is calculated to be the largest file size for a dense, block
2390 * mapped file such that the file's total number of 512-byte sectors,
2391 * including data and all indirect blocks, does not exceed (2^48 - 1).
2392 *
2393 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2394 * number of 512-byte sectors of the file.
0fc1b451
AK		 2395 */
2396
f287a1a5 2397 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2398 /*
90c699a9 2399 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2400 * the inode i_block field represents total file blocks in
2401 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2402 */
2403 upper_limit = (1LL << 32) - 1;
2404
2405 /* total blocks in file system block size */
2406 upper_limit >>= (bits - 9);
2407
2408 } else {
8180a562
AK		 2409 /*
2410 * We use 48 bit ext4_inode i_blocks
2411 * With EXT4_HUGE_FILE_FL set the i_blocks
2412 * represent total number of blocks in
2413 * file system block size
2414 */
0fc1b451
AK		 2415 upper_limit = (1LL << 48) - 1;
2416
0fc1b451
AK		 2417 }
2418
2419 /* indirect blocks */
2420 meta_blocks = 1;
2421 /* double indirect blocks */
2422 meta_blocks += 1 + (1LL << (bits-2));
2423 /* tripple indirect blocks */
2424 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2425
2426 upper_limit -= meta_blocks;
2427 upper_limit <<= bits;
ac27a0ec
DK		 2428
2429 res += 1LL << (bits-2);
2430 res += 1LL << (2*(bits-2));
2431 res += 1LL << (3*(bits-2));
2432 res <<= bits;
2433 if (res > upper_limit)
2434 res = upper_limit;
0fc1b451
AK		 2435
2436 if (res > MAX_LFS_FILESIZE)
2437 res = MAX_LFS_FILESIZE;
2438
ac27a0ec
DK		 2439 return res;
2440}
2441
617ba13b 2442static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2443 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2444{
617ba13b 2445 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2446 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2447 int has_super = 0;
2448
2449 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2450
e2b911c5 2451 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2452 return logical_sb_block + nr + 1;
ac27a0ec 2453 bg = sbi->s_desc_per_block * nr;
617ba13b 2454 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2455 has_super = 1;
0b8e58a1 2456
bd63f6b0
DW		 2457 /*
2458 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2459 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2460 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2461 * compensate.
2462 */
2463 if (sb->s_blocksize == 1024 && nr == 0 &&
2464 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2465 has_super++;
2466
617ba13b 2467 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2468}
2469
c9de560d
AT		 2470/**
2471 * ext4_get_stripe_size: Get the stripe size.
2472 * @sbi: In memory super block info
2473 *
2474 * If we have specified it via mount option, then
2475 * use the mount option value. If the value specified at mount time is
2476 * greater than the blocks per group use the super block value.
2477 * If the super block value is greater than blocks per group return 0.
2478 * Allocator needs it be less than blocks per group.
2479 *
2480 */
2481static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2482{
2483 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2484 unsigned long stripe_width =
2485 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2486 int ret;
c9de560d
AT		 2487
2488 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2489 ret = sbi->s_stripe;
2490 else if (stripe_width <= sbi->s_blocks_per_group)
2491 ret = stripe_width;
2492 else if (stride <= sbi->s_blocks_per_group)
2493 ret = stride;
2494 else
2495 ret = 0;
c9de560d 2496
3eb08658
DE		 2497 /*
2498 * If the stripe width is 1, this makes no sense and
2499 * we set it to 0 to turn off stripe handling code.
2500 */
2501 if (ret <= 1)
2502 ret = 0;
c9de560d 2503
3eb08658 2504 return ret;
c9de560d 2505}
ac27a0ec 2506
a13fb1a4
ES		 2507/*
2508 * Check whether this filesystem can be mounted based on
2509 * the features present and the RDONLY/RDWR mount requested.
2510 * Returns 1 if this filesystem can be mounted as requested,
2511 * 0 if it cannot be.
2512 */
2513static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2514{
e2b911c5 2515 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2516 ext4_msg(sb, KERN_ERR,
2517 "Couldn't mount because of "
2518 "unsupported optional features (%x)",
2519 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2520 ~EXT4_FEATURE_INCOMPAT_SUPP));
2521 return 0;
2522 }
2523
2524 if (readonly)
2525 return 1;
2526
e2b911c5 2527 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2528 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2529 sb->s_flags |= MS_RDONLY;
2530 return 1;
2531 }
2532
a13fb1a4 2533 /* Check that feature set is OK for a read-write mount */
e2b911c5 2534 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2535 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2536 "unsupported optional features (%x)",
2537 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2538 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2539 return 0;
2540 }
2541 /*
2542 * Large file size enabled file system can only be mounted
2543 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2544 */
e2b911c5 2545 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2546 if (sizeof(blkcnt_t) < sizeof(u64)) {
2547 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2548 "cannot be mounted RDWR without "
2549 "CONFIG_LBDAF");
2550 return 0;
2551 }
2552 }
e2b911c5 2553 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2554 ext4_msg(sb, KERN_ERR,
2555 "Can't support bigalloc feature without "
2556 "extents feature\n");
2557 return 0;
2558 }
7c319d32
AK		 2559
2560#ifndef CONFIG_QUOTA
e2b911c5 2561 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2562 ext4_msg(sb, KERN_ERR,
2563 "Filesystem with quota feature cannot be mounted RDWR "
2564 "without CONFIG_QUOTA");
2565 return 0;
2566 }
689c958c
LX		 2567 if (ext4_has_feature_project(sb) && !readonly) {
2568 ext4_msg(sb, KERN_ERR,
2569 "Filesystem with project quota feature cannot be mounted RDWR "
2570 "without CONFIG_QUOTA");
2571 return 0;
2572 }
7c319d32 2573#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2574 return 1;
2575}
2576
66e61a9e
TT		 2577/*
2578 * This function is called once a day if we have errors logged
2579 * on the file system
2580 */
2581static void print_daily_error_info(unsigned long arg)
2582{
2583 struct super_block *sb = (struct super_block *) arg;
2584 struct ext4_sb_info *sbi;
2585 struct ext4_super_block *es;
2586
2587 sbi = EXT4_SB(sb);
2588 es = sbi->s_es;
2589
2590 if (es->s_error_count)
ae0f78de
TT		 2591 /* fsck newer than v1.41.13 is needed to clean this condition. */
2592 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2593 le32_to_cpu(es->s_error_count));
2594 if (es->s_first_error_time) {
ae0f78de 2595 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2596 sb->s_id, le32_to_cpu(es->s_first_error_time),
2597 (int) sizeof(es->s_first_error_func),
2598 es->s_first_error_func,
2599 le32_to_cpu(es->s_first_error_line));
2600 if (es->s_first_error_ino)
2601 printk(": inode %u",
2602 le32_to_cpu(es->s_first_error_ino));
2603 if (es->s_first_error_block)
2604 printk(": block %llu", (unsigned long long)
2605 le64_to_cpu(es->s_first_error_block));
2606 printk("\n");
2607 }
2608 if (es->s_last_error_time) {
ae0f78de 2609 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2610 sb->s_id, le32_to_cpu(es->s_last_error_time),
2611 (int) sizeof(es->s_last_error_func),
2612 es->s_last_error_func,
2613 le32_to_cpu(es->s_last_error_line));
2614 if (es->s_last_error_ino)
2615 printk(": inode %u",
2616 le32_to_cpu(es->s_last_error_ino));
2617 if (es->s_last_error_block)
2618 printk(": block %llu", (unsigned long long)
2619 le64_to_cpu(es->s_last_error_block));
2620 printk("\n");
2621 }
2622 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2623}
2624
bfff6873
LC		 2625/* Find next suitable group and run ext4_init_inode_table */
2626static int ext4_run_li_request(struct ext4_li_request *elr)
2627{
2628 struct ext4_group_desc *gdp = NULL;
2629 ext4_group_t group, ngroups;
2630 struct super_block *sb;
2631 unsigned long timeout = 0;
2632 int ret = 0;
2633
2634 sb = elr->lr_super;
2635 ngroups = EXT4_SB(sb)->s_groups_count;
2636
8e8ad8a5 2637 sb_start_write(sb);
bfff6873
LC		 2638 for (group = elr->lr_next_group; group < ngroups; group++) {
2639 gdp = ext4_get_group_desc(sb, group, NULL);
2640 if (!gdp) {
2641 ret = 1;
2642 break;
2643 }
2644
2645 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2646 break;
2647 }
2648
7f511862 2649 if (group >= ngroups)
bfff6873
LC		 2650 ret = 1;
2651
2652 if (!ret) {
2653 timeout = jiffies;
2654 ret = ext4_init_inode_table(sb, group,
2655 elr->lr_timeout ? 0 : 1);
2656 if (elr->lr_timeout == 0) {
51ce6511
LC		 2657 timeout = (jiffies - timeout) *
2658 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2659 elr->lr_timeout = timeout;
2660 }
2661 elr->lr_next_sched = jiffies + elr->lr_timeout;
2662 elr->lr_next_group = group + 1;
2663 }
8e8ad8a5 2664 sb_end_write(sb);
bfff6873
LC		 2665
2666 return ret;
2667}
2668
2669/*
2670 * Remove lr_request from the list_request and free the
4ed5c033 2671 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2672 */
2673static void ext4_remove_li_request(struct ext4_li_request *elr)
2674{
2675 struct ext4_sb_info *sbi;
2676
2677 if (!elr)
2678 return;
2679
2680 sbi = elr->lr_sbi;
2681
2682 list_del(&elr->lr_request);
2683 sbi->s_li_request = NULL;
2684 kfree(elr);
2685}
2686
2687static void ext4_unregister_li_request(struct super_block *sb)
2688{
1bb933fb
LC		 2689 mutex_lock(&ext4_li_mtx);
2690 if (!ext4_li_info) {
2691 mutex_unlock(&ext4_li_mtx);
bfff6873 2692 return;
1bb933fb 2693 }
bfff6873
LC		 2694
2695 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2696 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2697 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2698 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2699}
2700
8f1f7453
ES		 2701static struct task_struct *ext4_lazyinit_task;
2702
bfff6873
LC		 2703/*
2704 * This is the function where ext4lazyinit thread lives. It walks
2705 * through the request list searching for next scheduled filesystem.
2706 * When such a fs is found, run the lazy initialization request
2707 * (ext4_rn_li_request) and keep track of the time spend in this
2708 * function. Based on that time we compute next schedule time of
2709 * the request. When walking through the list is complete, compute
2710 * next waking time and put itself into sleep.
2711 */
2712static int ext4_lazyinit_thread(void *arg)
2713{
2714 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2715 struct list_head *pos, *n;
2716 struct ext4_li_request *elr;
4ed5c033 2717 unsigned long next_wakeup, cur;
bfff6873
LC		 2718
2719 BUG_ON(NULL == eli);
2720
bfff6873
LC		 2721cont_thread:
2722 while (true) {
2723 next_wakeup = MAX_JIFFY_OFFSET;
2724
2725 mutex_lock(&eli->li_list_mtx);
2726 if (list_empty(&eli->li_request_list)) {
2727 mutex_unlock(&eli->li_list_mtx);
2728 goto exit_thread;
2729 }
2730
2731 list_for_each_safe(pos, n, &eli->li_request_list) {
2732 elr = list_entry(pos, struct ext4_li_request,
2733 lr_request);
2734
b2c78cd0
TT		 2735 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2736 if (ext4_run_li_request(elr) != 0) {
2737 /* error, remove the lazy_init job */
2738 ext4_remove_li_request(elr);
2739 continue;
2740 }
bfff6873
LC		 2741 }
2742
2743 if (time_before(elr->lr_next_sched, next_wakeup))
2744 next_wakeup = elr->lr_next_sched;
2745 }
2746 mutex_unlock(&eli->li_list_mtx);
2747
a0acae0e 2748 try_to_freeze();
bfff6873 2749
4ed5c033
LC		 2750 cur = jiffies;
2751 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2752 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2753 cond_resched();
2754 continue;
2755 }
2756
4ed5c033
LC		 2757 schedule_timeout_interruptible(next_wakeup - cur);
2758
8f1f7453
ES		 2759 if (kthread_should_stop()) {
2760 ext4_clear_request_list();
2761 goto exit_thread;
2762 }
bfff6873
LC		 2763 }
2764
2765exit_thread:
2766 /*
2767 * It looks like the request list is empty, but we need
2768 * to check it under the li_list_mtx lock, to prevent any
2769 * additions into it, and of course we should lock ext4_li_mtx
2770 * to atomically free the list and ext4_li_info, because at
2771 * this point another ext4 filesystem could be registering
2772 * new one.
2773 */
2774 mutex_lock(&ext4_li_mtx);
2775 mutex_lock(&eli->li_list_mtx);
2776 if (!list_empty(&eli->li_request_list)) {
2777 mutex_unlock(&eli->li_list_mtx);
2778 mutex_unlock(&ext4_li_mtx);
2779 goto cont_thread;
2780 }
2781 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2782 kfree(ext4_li_info);
2783 ext4_li_info = NULL;
2784 mutex_unlock(&ext4_li_mtx);
2785
2786 return 0;
2787}
2788
2789static void ext4_clear_request_list(void)
2790{
2791 struct list_head *pos, *n;
2792 struct ext4_li_request *elr;
2793
2794 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2795 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2796 elr = list_entry(pos, struct ext4_li_request,
2797 lr_request);
2798 ext4_remove_li_request(elr);
2799 }
2800 mutex_unlock(&ext4_li_info->li_list_mtx);
2801}
2802
2803static int ext4_run_lazyinit_thread(void)
2804{
8f1f7453
ES		 2805 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2806 ext4_li_info, "ext4lazyinit");
2807 if (IS_ERR(ext4_lazyinit_task)) {
2808 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2809 ext4_clear_request_list();
bfff6873
LC		 2810 kfree(ext4_li_info);
2811 ext4_li_info = NULL;
92b97816 2812 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2813 "initialization thread\n",
2814 err);
2815 return err;
2816 }
2817 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2818 return 0;
2819}
2820
2821/*
2822 * Check whether it make sense to run itable init. thread or not.
2823 * If there is at least one uninitialized inode table, return
2824 * corresponding group number, else the loop goes through all
2825 * groups and return total number of groups.
2826 */
2827static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2828{
2829 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2830 struct ext4_group_desc *gdp = NULL;
2831
2832 for (group = 0; group < ngroups; group++) {
2833 gdp = ext4_get_group_desc(sb, group, NULL);
2834 if (!gdp)
2835 continue;
2836
2837 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2838 break;
2839 }
2840
2841 return group;
2842}
2843
2844static int ext4_li_info_new(void)
2845{
2846 struct ext4_lazy_init *eli = NULL;
2847
2848 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2849 if (!eli)
2850 return -ENOMEM;
2851
bfff6873
LC		 2852 INIT_LIST_HEAD(&eli->li_request_list);
2853 mutex_init(&eli->li_list_mtx);
2854
bfff6873
LC		 2855 eli->li_state |= EXT4_LAZYINIT_QUIT;
2856
2857 ext4_li_info = eli;
2858
2859 return 0;
2860}
2861
2862static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2863 ext4_group_t start)
2864{
2865 struct ext4_sb_info *sbi = EXT4_SB(sb);
2866 struct ext4_li_request *elr;
bfff6873
LC		 2867
2868 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2869 if (!elr)
2870 return NULL;
2871
2872 elr->lr_super = sb;
2873 elr->lr_sbi = sbi;
2874 elr->lr_next_group = start;
2875
2876 /*
2877 * Randomize first schedule time of the request to
2878 * spread the inode table initialization requests
2879 * better.
2880 */
dd1f723b
TT		 2881 elr->lr_next_sched = jiffies + (prandom_u32() %
2882 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2883 return elr;
2884}
2885
7f511862
TT		 2886int ext4_register_li_request(struct super_block *sb,
2887 ext4_group_t first_not_zeroed)
bfff6873
LC		 2888{
2889 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2890 struct ext4_li_request *elr = NULL;
bfff6873 2891 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2892 int ret = 0;
bfff6873 2893
7f511862 2894 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2895 if (sbi->s_li_request != NULL) {
2896 /*
2897 * Reset timeout so it can be computed again, because
2898 * s_li_wait_mult might have changed.
2899 */
2900 sbi->s_li_request->lr_timeout = 0;
7f511862 2901 goto out;
51ce6511 2902 }
bfff6873
LC		 2903
2904 if (first_not_zeroed == ngroups ||
2905 (sb->s_flags & MS_RDONLY) ||
55ff3840 2906 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2907 goto out;
bfff6873
LC		 2908
2909 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2910 if (!elr) {
2911 ret = -ENOMEM;
2912 goto out;
2913 }
bfff6873
LC		 2914
2915 if (NULL == ext4_li_info) {
2916 ret = ext4_li_info_new();
2917 if (ret)
2918 goto out;
2919 }
2920
2921 mutex_lock(&ext4_li_info->li_list_mtx);
2922 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2923 mutex_unlock(&ext4_li_info->li_list_mtx);
2924
2925 sbi->s_li_request = elr;
46e4690b
TM		 2926 /*
2927 * set elr to NULL here since it has been inserted to
2928 * the request_list and the removal and free of it is
2929 * handled by ext4_clear_request_list from now on.
2930 */
2931 elr = NULL;
bfff6873
LC		 2932
2933 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2934 ret = ext4_run_lazyinit_thread();
2935 if (ret)
2936 goto out;
2937 }
bfff6873 2938out:
beed5ecb
NK		 2939 mutex_unlock(&ext4_li_mtx);
2940 if (ret)
bfff6873 2941 kfree(elr);
bfff6873
LC		 2942 return ret;
2943}
2944
2945/*
2946 * We do not need to lock anything since this is called on
2947 * module unload.
2948 */
2949static void ext4_destroy_lazyinit_thread(void)
2950{
2951 /*
2952 * If thread exited earlier
2953 * there's nothing to be done.
2954 */
8f1f7453 2955 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2956 return;
2957
8f1f7453 2958 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2959}
2960
25ed6e8a
DW		 2961static int set_journal_csum_feature_set(struct super_block *sb)
2962{
2963 int ret = 1;
2964 int compat, incompat;
2965 struct ext4_sb_info *sbi = EXT4_SB(sb);
2966
9aa5d32b 2967 if (ext4_has_metadata_csum(sb)) {
db9ee220 2968 /* journal checksum v3 */
25ed6e8a 2969 compat = 0;
db9ee220 2970 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2971 } else {
2972 /* journal checksum v1 */
2973 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2974 incompat = 0;
2975 }
2976
feb8c6d3
DW		 2977 jbd2_journal_clear_features(sbi->s_journal,
2978 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2979 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2980 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2981 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2982 ret = jbd2_journal_set_features(sbi->s_journal,
2983 compat, 0,
2984 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2985 incompat);
2986 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2987 ret = jbd2_journal_set_features(sbi->s_journal,
2988 compat, 0,
2989 incompat);
2990 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2991 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2992 } else {
feb8c6d3
DW		 2993 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2994 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2995 }
2996
2997 return ret;
2998}
2999
952fc18e
TT		 3000/*
3001 * Note: calculating the overhead so we can be compatible with
3002 * historical BSD practice is quite difficult in the face of
3003 * clusters/bigalloc. This is because multiple metadata blocks from
3004 * different block group can end up in the same allocation cluster.
3005 * Calculating the exact overhead in the face of clustered allocation
3006 * requires either O(all block bitmaps) in memory or O(number of block
3007 * groups**2) in time. We will still calculate the superblock for
3008 * older file systems --- and if we come across with a bigalloc file
3009 * system with zero in s_overhead_clusters the estimate will be close to
3010 * correct especially for very large cluster sizes --- but for newer
3011 * file systems, it's better to calculate this figure once at mkfs
3012 * time, and store it in the superblock. If the superblock value is
3013 * present (even for non-bigalloc file systems), we will use it.
3014 */
3015static int count_overhead(struct super_block *sb, ext4_group_t grp,
3016 char *buf)
3017{
3018 struct ext4_sb_info *sbi = EXT4_SB(sb);
3019 struct ext4_group_desc *gdp;
3020 ext4_fsblk_t first_block, last_block, b;
3021 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3022 int s, j, count = 0;
3023
e2b911c5 3024 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3025 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3026 sbi->s_itb_per_group + 2);
3027
952fc18e
TT		 3028 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3029 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3030 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3031 for (i = 0; i < ngroups; i++) {
3032 gdp = ext4_get_group_desc(sb, i, NULL);
3033 b = ext4_block_bitmap(sb, gdp);
3034 if (b >= first_block && b <= last_block) {
3035 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3036 count++;
3037 }
3038 b = ext4_inode_bitmap(sb, gdp);
3039 if (b >= first_block && b <= last_block) {
3040 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3041 count++;
3042 }
3043 b = ext4_inode_table(sb, gdp);
3044 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3045 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3046 int c = EXT4_B2C(sbi, b - first_block);
3047 ext4_set_bit(c, buf);
3048 count++;
3049 }
3050 if (i != grp)
3051 continue;
3052 s = 0;
3053 if (ext4_bg_has_super(sb, grp)) {
3054 ext4_set_bit(s++, buf);
3055 count++;
3056 }
3057 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3058 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3059 count++;
3060 }
3061 }
3062 if (!count)
3063 return 0;
3064 return EXT4_CLUSTERS_PER_GROUP(sb) -
3065 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3066}
3067
3068/*
3069 * Compute the overhead and stash it in sbi->s_overhead
3070 */
3071int ext4_calculate_overhead(struct super_block *sb)
3072{
3073 struct ext4_sb_info *sbi = EXT4_SB(sb);
3074 struct ext4_super_block *es = sbi->s_es;
3075 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3076 ext4_fsblk_t overhead = 0;
4fdb5543 3077 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3078
952fc18e
TT		 3079 if (!buf)
3080 return -ENOMEM;
3081
3082 /*
3083 * Compute the overhead (FS structures). This is constant
3084 * for a given filesystem unless the number of block groups
3085 * changes so we cache the previous value until it does.
3086 */
3087
3088 /*
3089 * All of the blocks before first_data_block are overhead
3090 */
3091 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3092
3093 /*
3094 * Add the overhead found in each block group
3095 */
3096 for (i = 0; i < ngroups; i++) {
3097 int blks;
3098
3099 blks = count_overhead(sb, i, buf);
3100 overhead += blks;
3101 if (blks)
3102 memset(buf, 0, PAGE_SIZE);
3103 cond_resched();
3104 }
b003b524
ES		 3105 /* Add the internal journal blocks as well */
3106 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3107 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3108
952fc18e
TT		 3109 sbi->s_overhead = overhead;
3110 smp_wmb();
3111 free_page((unsigned long) buf);
3112 return 0;
3113}
3114
b5799018 3115static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3116{
3117 ext4_fsblk_t resv_clusters;
b5799018 3118 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3119
30fac0f7
JK		 3120 /*
3121 * There's no need to reserve anything when we aren't using extents.
3122 * The space estimates are exact, there are no unwritten extents,
3123 * hole punching doesn't need new metadata... This is needed especially
3124 * to keep ext2/3 backward compatibility.
3125 */
e2b911c5 3126 if (!ext4_has_feature_extents(sb))
b5799018 3127 return;
27dd4385
LC		 3128 /*
3129 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3130 * This should cover the situations where we can not afford to run
3131 * out of space like for example punch hole, or converting
556615dc 3132 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3133 * allocation would require 1, or 2 blocks, higher numbers are
3134 * very rare.
3135 */
b5799018
TT		 3136 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3137 sbi->s_cluster_bits);
27dd4385
LC		 3138
3139 do_div(resv_clusters, 50);
3140 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3141
b5799018 3142 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3143}
3144
2b2d6d01 3145static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3146{
d4c402d9 3147 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3148 struct buffer_head *bh;
617ba13b
MC		 3149 struct ext4_super_block *es = NULL;
3150 struct ext4_sb_info *sbi;
3151 ext4_fsblk_t block;
3152 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3153 ext4_fsblk_t logical_sb_block;
ac27a0ec 3154 unsigned long offset = 0;
ac27a0ec
DK		 3155 unsigned long journal_devnum = 0;
3156 unsigned long def_mount_opts;
3157 struct inode *root;
0390131b 3158 const char *descr;
dcc7dae3 3159 int ret = -ENOMEM;
281b5995 3160 int blocksize, clustersize;
4ec11028
TT		 3161 unsigned int db_count;
3162 unsigned int i;
281b5995 3163 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3164 __u64 blocks_count;
07aa2ea1 3165 int err = 0;
b3881f74 3166 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3167 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3168
3169 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3170 if (!sbi)
dcc7dae3 3171 goto out_free_orig;
705895b6
PE		 3172
3173 sbi->s_blockgroup_lock =
3174 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3175 if (!sbi->s_blockgroup_lock) {
3176 kfree(sbi);
dcc7dae3 3177 goto out_free_orig;
705895b6 3178 }
ac27a0ec 3179 sb->s_fs_info = sbi;
2c0544b2 3180 sbi->s_sb = sb;
240799cd 3181 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3182 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3183 if (sb->s_bdev->bd_part)
3184 sbi->s_sectors_written_start =
3185 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3186
9f6200bb 3187 /* Cleanup superblock name */
ec3904dc 3188 strreplace(sb->s_id, '/', '!');
9f6200bb 3189
07aa2ea1 3190 /* -EINVAL is default */
dcc7dae3 3191 ret = -EINVAL;
617ba13b 3192 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3193 if (!blocksize) {
b31e1552 3194 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3195 goto out_fail;
3196 }
3197
3198 /*
617ba13b 3199 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3200 * block sizes. We need to calculate the offset from buffer start.
3201 */
617ba13b 3202 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3203 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3204 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3205 } else {
70bbb3e0 3206 logical_sb_block = sb_block;
ac27a0ec
DK		 3207 }
3208
a8ac900b 3209 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3210 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3211 goto out_fail;
3212 }
3213 /*
3214 * Note: s_es must be initialized as soon as possible because
617ba13b 3215 * some ext4 macro-instructions depend on its value
ac27a0ec 3216 */
2716b802 3217 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3218 sbi->s_es = es;
3219 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3220 if (sb->s_magic != EXT4_SUPER_MAGIC)
3221 goto cantfind_ext4;
afc32f7e 3222 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3223
feb0ab32 3224 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3225 if (ext4_has_feature_metadata_csum(sb) &&
3226 ext4_has_feature_gdt_csum(sb))
363307e6 3227 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3228 "redundant flags; please run fsck.");
3229
d25425f8
DW		 3230 /* Check for a known checksum algorithm */
3231 if (!ext4_verify_csum_type(sb, es)) {
3232 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3233 "unknown checksum algorithm.");
3234 silent = 1;
3235 goto cantfind_ext4;
3236 }
3237
0441984a 3238 /* Load the checksum driver */
e2b911c5 3239 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3240 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3241 if (IS_ERR(sbi->s_chksum_driver)) {
3242 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3243 ret = PTR_ERR(sbi->s_chksum_driver);
3244 sbi->s_chksum_driver = NULL;
3245 goto failed_mount;
3246 }
3247 }
3248
a9c47317
DW		 3249 /* Check superblock checksum */
3250 if (!ext4_superblock_csum_verify(sb, es)) {
3251 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3252 "invalid superblock checksum. Run e2fsck?");
3253 silent = 1;
6a797d27 3254 ret = -EFSBADCRC;
a9c47317
DW		 3255 goto cantfind_ext4;
3256 }
3257
3258 /* Precompute checksum seed for all metadata */
e2b911c5 3259 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3260 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3261 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3262 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3263 sizeof(es->s_uuid));
3264
ac27a0ec
DK		 3265 /* Set defaults before we parse the mount options */
3266 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3267 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3268 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3269 set_opt(sb, DEBUG);
87f26807 3270 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3271 set_opt(sb, GRPID);
617ba13b 3272 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3273 set_opt(sb, NO_UID32);
ea663336 3274 /* xattr user namespace & acls are now defaulted on */
ea663336 3275 set_opt(sb, XATTR_USER);
03010a33 3276#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3277 set_opt(sb, POSIX_ACL);
2e7842b8 3278#endif
98c1a759
DW		 3279 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3280 if (ext4_has_metadata_csum(sb))
3281 set_opt(sb, JOURNAL_CHECKSUM);
3282
617ba13b 3283 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3284 set_opt(sb, JOURNAL_DATA);
617ba13b 3285 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3286 set_opt(sb, ORDERED_DATA);
617ba13b 3287 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3288 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3289
3290 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3291 set_opt(sb, ERRORS_PANIC);
bb4f397a 3292 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3293 set_opt(sb, ERRORS_CONT);
bb4f397a 3294 else
fd8c37ec 3295 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3296 /* block_validity enabled by default; disable with noblock_validity */
3297 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3298 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3299 set_opt(sb, DISCARD);
ac27a0ec 3300
08cefc7a
EB		 3301 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3302 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3303 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3304 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3305 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3306
8b67f04a 3307 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3308 set_opt(sb, BARRIER);
ac27a0ec 3309
dd919b98
AK		 3310 /*
3311 * enable delayed allocation by default
3312 * Use -o nodelalloc to turn it off
3313 */
bc0b75f7 3314 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3315 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3316 set_opt(sb, DELALLOC);
dd919b98 3317
51ce6511
LC		 3318 /*
3319 * set default s_li_wait_mult for lazyinit, for the case there is
3320 * no mount option specified.
3321 */
3322 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3323
8b67f04a 3324 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3325 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3326 ext4_msg(sb, KERN_WARNING,
3327 "failed to parse options in superblock: %s",
3328 sbi->s_es->s_mount_opts);
3329 }
5a916be1 3330 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3331 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3332 &journal_ioprio, 0))
ac27a0ec
DK		 3333 goto failed_mount;
3334
56889787
TT		 3335 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3336 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3337 "with data=journal disables delayed "
3338 "allocation and O_DIRECT support!\n");
3339 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3340 ext4_msg(sb, KERN_ERR, "can't mount with "
3341 "both data=journal and delalloc");
3342 goto failed_mount;
3343 }
3344 if (test_opt(sb, DIOREAD_NOLOCK)) {
3345 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3346 "both data=journal and dioread_nolock");
56889787
TT		 3347 goto failed_mount;
3348 }
923ae0ff
RZ		 3349 if (test_opt(sb, DAX)) {
3350 ext4_msg(sb, KERN_ERR, "can't mount with "
3351 "both data=journal and dax");
3352 goto failed_mount;
3353 }
56889787
TT		 3354 if (test_opt(sb, DELALLOC))
3355 clear_opt(sb, DELALLOC);
001e4a87
TH		 3356 } else {
3357 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3358 }
3359
ac27a0ec 3360 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3361 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3362
617ba13b 3363 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3364 (ext4_has_compat_features(sb) ||
3365 ext4_has_ro_compat_features(sb) ||
3366 ext4_has_incompat_features(sb)))
b31e1552
ES		 3367 ext4_msg(sb, KERN_WARNING,
3368 "feature flags set on rev 0 fs, "
3369 "running e2fsck is recommended");
469108ff 3370
ed3654eb
TT		 3371 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3372 set_opt2(sb, HURD_COMPAT);
e2b911c5 3373 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3374 ext4_msg(sb, KERN_ERR,
3375 "The Hurd can't support 64-bit file systems");
3376 goto failed_mount;
3377 }
3378 }
3379
2035e776
TT		 3380 if (IS_EXT2_SB(sb)) {
3381 if (ext2_feature_set_ok(sb))
3382 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3383 "using the ext4 subsystem");
3384 else {
3385 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3386 "to feature incompatibilities");
3387 goto failed_mount;
3388 }
3389 }
3390
3391 if (IS_EXT3_SB(sb)) {
3392 if (ext3_feature_set_ok(sb))
3393 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3394 "using the ext4 subsystem");
3395 else {
3396 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3397 "to feature incompatibilities");
3398 goto failed_mount;
3399 }
3400 }
3401
ac27a0ec
DK		 3402 /*
3403 * Check feature flags regardless of the revision level, since we
3404 * previously didn't change the revision level when setting the flags,
3405 * so there is a chance incompat flags are set on a rev 0 filesystem.
3406 */
a13fb1a4 3407 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3408 goto failed_mount;
a13fb1a4 3409
261cb20c 3410 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3411 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3412 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3413 ext4_msg(sb, KERN_ERR,
3414 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3415 goto failed_mount;
3416 }
3417
923ae0ff
RZ		 3418 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3419 if (blocksize != PAGE_SIZE) {
3420 ext4_msg(sb, KERN_ERR,
3421 "error: unsupported blocksize for dax");
3422 goto failed_mount;
3423 }
3424 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3425 ext4_msg(sb, KERN_ERR,
3426 "error: device does not support dax");
3427 goto failed_mount;
3428 }
3429 }
3430
e2b911c5 3431 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3432 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3433 es->s_encryption_level);
3434 goto failed_mount;
3435 }
3436
ac27a0ec 3437 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3438 /* Validate the filesystem blocksize */
3439 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3440 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3441 blocksize);
ac27a0ec
DK		 3442 goto failed_mount;
3443 }
3444
2b2d6d01 3445 brelse(bh);
70bbb3e0
AM		 3446 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3447 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3448 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3449 if (!bh) {
b31e1552
ES		 3450 ext4_msg(sb, KERN_ERR,
3451 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3452 goto failed_mount;
3453 }
2716b802 3454 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3455 sbi->s_es = es;
617ba13b 3456 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3457 ext4_msg(sb, KERN_ERR,
3458 "Magic mismatch, very weird!");
ac27a0ec
DK		 3459 goto failed_mount;
3460 }
3461 }
3462
e2b911c5 3463 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3464 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3465 has_huge_files);
3466 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3467
617ba13b
MC		 3468 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3469 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3470 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3471 } else {
3472 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3473 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3474 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3475 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3476 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3477 ext4_msg(sb, KERN_ERR,
3478 "unsupported inode size: %d",
2b2d6d01 3479 sbi->s_inode_size);
ac27a0ec
DK		 3480 goto failed_mount;
3481 }
ef7f3835
KS		 3482 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3483 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3484 }
0b8e58a1 3485
0d1ee42f 3486 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3487 if (ext4_has_feature_64bit(sb)) {
8fadc143 3488 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3489 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3490 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3491 ext4_msg(sb, KERN_ERR,
3492 "unsupported descriptor size %lu",
0d1ee42f
AR		 3493 sbi->s_desc_size);
3494 goto failed_mount;
3495 }
3496 } else
3497 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3498
ac27a0ec 3499 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3500 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3501 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3502 goto cantfind_ext4;
0b8e58a1 3503
617ba13b 3504 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3505 if (sbi->s_inodes_per_block == 0)
617ba13b 3506 goto cantfind_ext4;
ac27a0ec
DK		 3507 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3508 sbi->s_inodes_per_block;
0d1ee42f 3509 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3510 sbi->s_sbh = bh;
3511 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3512 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3513 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3514
2b2d6d01 3515 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3516 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3517 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3518 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3519 i = le32_to_cpu(es->s_flags);
3520 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3521 sbi->s_hash_unsigned = 3;
3522 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3523#ifdef __CHAR_UNSIGNED__
23301410
TT		 3524 if (!(sb->s_flags & MS_RDONLY))
3525 es->s_flags |=
3526 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3527 sbi->s_hash_unsigned = 3;
f99b2589 3528#else
23301410
TT		 3529 if (!(sb->s_flags & MS_RDONLY))
3530 es->s_flags |=
3531 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3532#endif
23301410 3533 }
f99b2589 3534 }
ac27a0ec 3535
281b5995
TT		 3536 /* Handle clustersize */
3537 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3538 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3539 if (has_bigalloc) {
3540 if (clustersize < blocksize) {
3541 ext4_msg(sb, KERN_ERR,
3542 "cluster size (%d) smaller than "
3543 "block size (%d)", clustersize, blocksize);
3544 goto failed_mount;
3545 }
3546 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3547 le32_to_cpu(es->s_log_block_size);
3548 sbi->s_clusters_per_group =
3549 le32_to_cpu(es->s_clusters_per_group);
3550 if (sbi->s_clusters_per_group > blocksize * 8) {
3551 ext4_msg(sb, KERN_ERR,
3552 "#clusters per group too big: %lu",
3553 sbi->s_clusters_per_group);
3554 goto failed_mount;
3555 }
3556 if (sbi->s_blocks_per_group !=
3557 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3558 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3559 "clusters per group (%lu) inconsistent",
3560 sbi->s_blocks_per_group,
3561 sbi->s_clusters_per_group);
3562 goto failed_mount;
3563 }
3564 } else {
3565 if (clustersize != blocksize) {
3566 ext4_warning(sb, "fragment/cluster size (%d) != "
3567 "block size (%d)", clustersize,
3568 blocksize);
3569 clustersize = blocksize;
3570 }
3571 if (sbi->s_blocks_per_group > blocksize * 8) {
3572 ext4_msg(sb, KERN_ERR,
3573 "#blocks per group too big: %lu",
3574 sbi->s_blocks_per_group);
3575 goto failed_mount;
3576 }
3577 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3578 sbi->s_cluster_bits = 0;
ac27a0ec 3579 }
281b5995
TT		 3580 sbi->s_cluster_ratio = clustersize / blocksize;
3581
ac27a0ec 3582 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3583 ext4_msg(sb, KERN_ERR,
3584 "#inodes per group too big: %lu",
2b2d6d01 3585 sbi->s_inodes_per_group);
ac27a0ec
DK		 3586 goto failed_mount;
3587 }
3588
960fd856
TT		 3589 /* Do we have standard group size of clustersize * 8 blocks ? */
3590 if (sbi->s_blocks_per_group == clustersize << 3)
3591 set_opt2(sb, STD_GROUP_SIZE);
3592
bf43d84b
ES		 3593 /*
3594 * Test whether we have more sectors than will fit in sector_t,
3595 * and whether the max offset is addressable by the page cache.
3596 */
5a9ae68a 3597 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3598 ext4_blocks_count(es));
5a9ae68a 3599 if (err) {
b31e1552 3600 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3601 " too large to mount safely on this system");
ac27a0ec 3602 if (sizeof(sector_t) < 8)
90c699a9 3603 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3604 goto failed_mount;
3605 }
3606
617ba13b
MC		 3607 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3608 goto cantfind_ext4;
e7c95593 3609
0f2ddca6
FTN		 3610 /* check blocks count against device size */
3611 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3612 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3613 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3614 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3615 ext4_blocks_count(es), blocks_count);
3616 goto failed_mount;
3617 }
3618
0b8e58a1
AD		 3619 /*
3620 * It makes no sense for the first data block to be beyond the end
3621 * of the filesystem.
3622 */
3623 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3624 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3625 "block %u is beyond end of filesystem (%llu)",
3626 le32_to_cpu(es->s_first_data_block),
3627 ext4_blocks_count(es));
e7c95593
ES		 3628 goto failed_mount;
3629 }
bd81d8ee
LV		 3630 blocks_count = (ext4_blocks_count(es) -
3631 le32_to_cpu(es->s_first_data_block) +
3632 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3633 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3634 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3635 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3636 "(block count %llu, first data block %u, "
b31e1552 3637 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3638 ext4_blocks_count(es),
3639 le32_to_cpu(es->s_first_data_block),
3640 EXT4_BLOCKS_PER_GROUP(sb));
3641 goto failed_mount;
3642 }
bd81d8ee 3643 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3644 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3645 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3646 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3647 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3648 sbi->s_group_desc = ext4_kvmalloc(db_count *
3649 sizeof(struct buffer_head *),
3650 GFP_KERNEL);
ac27a0ec 3651 if (sbi->s_group_desc == NULL) {
b31e1552 3652 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3653 ret = -ENOMEM;
ac27a0ec
DK		 3654 goto failed_mount;
3655 }
3656
705895b6 3657 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3658
3659 for (i = 0; i < db_count; i++) {
70bbb3e0 3660 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3661 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3662 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3663 ext4_msg(sb, KERN_ERR,
3664 "can't read group descriptor %d", i);
ac27a0ec
DK		 3665 db_count = i;
3666 goto failed_mount2;
3667 }
3668 }
bfff6873 3669 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3670 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3671 ret = -EFSCORRUPTED;
f9ae9cf5 3672 goto failed_mount2;
ac27a0ec 3673 }
772cb7c8 3674
f9ae9cf5 3675 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3676 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3677 spin_lock_init(&sbi->s_next_gen_lock);
3678
04ecddb7
JM		 3679 setup_timer(&sbi->s_err_report, print_daily_error_info,
3680 (unsigned long) sb);
04496411 3681
a75ae78f 3682 /* Register extent status tree shrinker */
eb68d0e2 3683 if (ext4_es_register_shrinker(sbi))
ce7e010a 3684 goto failed_mount3;
ce7e010a 3685
c9de560d 3686 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3687 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3688
f9ae9cf5
TT		 3689 /*
3690 * set up enough so that it can read an inode
3691 */
f6e63f90 3692 sb->s_op = &ext4_sops;
617ba13b
MC		 3693 sb->s_export_op = &ext4_export_ops;
3694 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3695#ifdef CONFIG_QUOTA
617ba13b 3696 sb->dq_op = &ext4_quota_operations;
e2b911c5 3697 if (ext4_has_feature_quota(sb))
1fa5efe3 3698 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3699 else
3700 sb->s_qcop = &ext4_qctl_operations;
689c958c 3701 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 3702#endif
f2fa2ffc
AK		 3703 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3704
ac27a0ec 3705 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3706 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3707
3708 sb->s_root = NULL;
3709
3710 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3711 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3712
e2b911c5 3713 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3714 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3715 goto failed_mount3a;
c5e06d10 3716
ac27a0ec
DK		 3717 /*
3718 * The first inode we look at is the journal inode. Don't try
3719 * root first: it may be modified in the journal!
3720 */
e2b911c5 3721 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3722 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3723 goto failed_mount3a;
0390131b 3724 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3725 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3726 ext4_msg(sb, KERN_ERR, "required journal recovery "
3727 "suppressed and not mounted read-only");
744692dc 3728 goto failed_mount_wq;
ac27a0ec 3729 } else {
1e381f60
DM		 3730 /* Nojournal mode, all journal mount options are illegal */
3731 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3732 ext4_msg(sb, KERN_ERR, "can't mount with "
3733 "journal_checksum, fs mounted w/o journal");
3734 goto failed_mount_wq;
3735 }
3736 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3737 ext4_msg(sb, KERN_ERR, "can't mount with "
3738 "journal_async_commit, fs mounted w/o journal");
3739 goto failed_mount_wq;
3740 }
3741 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3742 ext4_msg(sb, KERN_ERR, "can't mount with "
3743 "commit=%lu, fs mounted w/o journal",
3744 sbi->s_commit_interval / HZ);
3745 goto failed_mount_wq;
3746 }
3747 if (EXT4_MOUNT_DATA_FLAGS &
3748 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3749 ext4_msg(sb, KERN_ERR, "can't mount with "
3750 "data=, fs mounted w/o journal");
3751 goto failed_mount_wq;
3752 }
3753 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3754 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3755 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3756 sbi->s_journal = NULL;
3757 needs_recovery = 0;
3758 goto no_journal;
ac27a0ec
DK		 3759 }
3760
e2b911c5 3761 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3762 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3763 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3764 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3765 goto failed_mount_wq;
eb40a09c
JS		 3766 }
3767
25ed6e8a
DW		 3768 if (!set_journal_csum_feature_set(sb)) {
3769 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3770 "feature set");
3771 goto failed_mount_wq;
d4da6c9c 3772 }
818d276c 3773
ac27a0ec
DK		 3774 /* We have now updated the journal if required, so we can
3775 * validate the data journaling mode. */
3776 switch (test_opt(sb, DATA_FLAGS)) {
3777 case 0:
3778 /* No mode set, assume a default based on the journal
63f57933
AM		 3779 * capabilities: ORDERED_DATA if the journal can
3780 * cope, else JOURNAL_DATA
3781 */
dab291af
MC		 3782 if (jbd2_journal_check_available_features
3783 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3784 set_opt(sb, ORDERED_DATA);
ac27a0ec 3785 else
fd8c37ec 3786 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3787 break;
3788
617ba13b
MC		 3789 case EXT4_MOUNT_ORDERED_DATA:
3790 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3791 if (!jbd2_journal_check_available_features
3792 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3793 ext4_msg(sb, KERN_ERR, "Journal does not support "
3794 "requested data journaling mode");
744692dc 3795 goto failed_mount_wq;
ac27a0ec
DK		 3796 }
3797 default:
3798 break;
3799 }
b3881f74 3800 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3801
18aadd47
BJ		 3802 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3803
ce7e010a 3804no_journal:
2335d05f
AG		 3805 sbi->s_mb_cache = ext4_xattr_create_cache();
3806 if (!sbi->s_mb_cache) {
3807 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3808 goto failed_mount_wq;
9c191f70
M		 3809 }
3810
e2b911c5 3811 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 3812 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 3813 ext4_msg(sb, KERN_ERR,
3814 "Unsupported blocksize for fs encryption");
3815 goto failed_mount_wq;
3816 }
3817
e2b911c5
DW		 3818 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3819 !ext4_has_feature_encrypt(sb)) {
3820 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3821 ext4_commit_super(sb, 1);
3822 }
3823
952fc18e
TT		 3824 /*
3825 * Get the # of file system overhead blocks from the
3826 * superblock if present.
3827 */
3828 if (es->s_overhead_clusters)
3829 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3830 else {
07aa2ea1
LC		 3831 err = ext4_calculate_overhead(sb);
3832 if (err)
952fc18e
TT		 3833 goto failed_mount_wq;
3834 }
3835
fd89d5f2
TH		 3836 /*
3837 * The maximum number of concurrent works can be high and
3838 * concurrency isn't really necessary. Limit it to 1.
3839 */
2e8fa54e
JK		 3840 EXT4_SB(sb)->rsv_conversion_wq =
3841 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3842 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3843 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3844 ret = -ENOMEM;
2e8fa54e
JK		 3845 goto failed_mount4;
3846 }
3847
ac27a0ec 3848 /*
dab291af 3849 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3850 * so we can safely mount the rest of the filesystem now.
3851 */
3852
1d1fe1ee
DH		 3853 root = ext4_iget(sb, EXT4_ROOT_INO);
3854 if (IS_ERR(root)) {
b31e1552 3855 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3856 ret = PTR_ERR(root);
32a9bb57 3857 root = NULL;
ac27a0ec
DK		 3858 goto failed_mount4;
3859 }
3860 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3861 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3862 iput(root);
ac27a0ec
DK		 3863 goto failed_mount4;
3864 }
48fde701 3865 sb->s_root = d_make_root(root);
1d1fe1ee 3866 if (!sb->s_root) {
b31e1552 3867 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3868 ret = -ENOMEM;
3869 goto failed_mount4;
3870 }
ac27a0ec 3871
7e84b621
ES		 3872 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3873 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3874
3875 /* determine the minimum size of new large inodes, if present */
3876 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3877 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3878 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 3879 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 3880 if (sbi->s_want_extra_isize <
3881 le16_to_cpu(es->s_want_extra_isize))
3882 sbi->s_want_extra_isize =
3883 le16_to_cpu(es->s_want_extra_isize);
3884 if (sbi->s_want_extra_isize <
3885 le16_to_cpu(es->s_min_extra_isize))
3886 sbi->s_want_extra_isize =
3887 le16_to_cpu(es->s_min_extra_isize);
3888 }
3889 }
3890 /* Check if enough inode space is available */
3891 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3892 sbi->s_inode_size) {
3893 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3894 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3895 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3896 "available");
ef7f3835
KS		 3897 }
3898
b5799018 3899 ext4_set_resv_clusters(sb);
27dd4385 3900
6fd058f7
TT		 3901 err = ext4_setup_system_zone(sb);
3902 if (err) {
b31e1552 3903 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3904 "zone (%d)", err);
f9ae9cf5
TT		 3905 goto failed_mount4a;
3906 }
3907
3908 ext4_ext_init(sb);
3909 err = ext4_mb_init(sb);
3910 if (err) {
3911 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3912 err);
dcf2d804 3913 goto failed_mount5;
c2774d84
AK		 3914 }
3915
d5e03cbb
TT		 3916 block = ext4_count_free_clusters(sb);
3917 ext4_free_blocks_count_set(sbi->s_es,
3918 EXT4_C2B(sbi, block));
908c7f19
TH		 3919 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3920 GFP_KERNEL);
d5e03cbb
TT		 3921 if (!err) {
3922 unsigned long freei = ext4_count_free_inodes(sb);
3923 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3924 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3925 GFP_KERNEL);
d5e03cbb
TT		 3926 }
3927 if (!err)
3928 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3929 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3930 if (!err)
908c7f19
TH		 3931 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3932 GFP_KERNEL);
d5e03cbb
TT		 3933 if (err) {
3934 ext4_msg(sb, KERN_ERR, "insufficient memory");
3935 goto failed_mount6;
3936 }
3937
e2b911c5 3938 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 3939 if (!ext4_fill_flex_info(sb)) {
3940 ext4_msg(sb, KERN_ERR,
3941 "unable to initialize "
3942 "flex_bg meta info!");
3943 goto failed_mount6;
3944 }
3945
bfff6873
LC		 3946 err = ext4_register_li_request(sb, first_not_zeroed);
3947 if (err)
dcf2d804 3948 goto failed_mount6;
bfff6873 3949
b5799018 3950 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3951 if (err)
3952 goto failed_mount7;
3197ebdb 3953
9b2ff357
JK		 3954#ifdef CONFIG_QUOTA
3955 /* Enable quota usage during mount. */
e2b911c5 3956 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 3957 err = ext4_enable_quotas(sb);
3958 if (err)
3959 goto failed_mount8;
3960 }
3961#endif /* CONFIG_QUOTA */
3962
617ba13b
MC		 3963 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3964 ext4_orphan_cleanup(sb, es);
3965 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3966 if (needs_recovery) {
b31e1552 3967 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3968 ext4_mark_recovery_complete(sb, es);
3969 }
3970 if (EXT4_SB(sb)->s_journal) {
3971 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3972 descr = " journalled data mode";
3973 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3974 descr = " ordered data mode";
3975 else
3976 descr = " writeback data mode";
3977 } else
3978 descr = "out journal";
3979
79add3a3
LC		 3980 if (test_opt(sb, DISCARD)) {
3981 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3982 if (!blk_queue_discard(q))
3983 ext4_msg(sb, KERN_WARNING,
3984 "mounting with \"discard\" option, but "
3985 "the device does not support discard");
3986 }
3987
e294a537
TT		 3988 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3989 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3990 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3991 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3992
66e61a9e
TT		 3993 if (es->s_error_count)
3994 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3995
efbed4dc
TT		 3996 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3997 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3998 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3999 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4000
d4c402d9 4001 kfree(orig_data);
ac27a0ec
DK		 4002 return 0;
4003
617ba13b 4004cantfind_ext4:
ac27a0ec 4005 if (!silent)
b31e1552 4006 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4007 goto failed_mount;
4008
72ba7450
TT		 4009#ifdef CONFIG_QUOTA
4010failed_mount8:
ebd173be 4011 ext4_unregister_sysfs(sb);
72ba7450 4012#endif
dcf2d804
TM		 4013failed_mount7:
4014 ext4_unregister_li_request(sb);
4015failed_mount6:
f9ae9cf5 4016 ext4_mb_release(sb);
d5e03cbb 4017 if (sbi->s_flex_groups)
b93b41d4 4018 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4019 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4020 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4021 percpu_counter_destroy(&sbi->s_dirs_counter);
4022 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4023failed_mount5:
f9ae9cf5
TT		 4024 ext4_ext_release(sb);
4025 ext4_release_system_zone(sb);
4026failed_mount4a:
94bf608a 4027 dput(sb->s_root);
32a9bb57 4028 sb->s_root = NULL;
94bf608a 4029failed_mount4:
b31e1552 4030 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4031 if (EXT4_SB(sb)->rsv_conversion_wq)
4032 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4033failed_mount_wq:
82939d79
JK		 4034 if (sbi->s_mb_cache) {
4035 ext4_xattr_destroy_cache(sbi->s_mb_cache);
4036 sbi->s_mb_cache = NULL;
4037 }
0390131b
FM		 4038 if (sbi->s_journal) {
4039 jbd2_journal_destroy(sbi->s_journal);
4040 sbi->s_journal = NULL;
4041 }
50460fe8 4042failed_mount3a:
d3922a77 4043 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4044failed_mount3:
9105bb14 4045 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4046 if (sbi->s_mmp_tsk)
4047 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4048failed_mount2:
4049 for (i = 0; i < db_count; i++)
4050 brelse(sbi->s_group_desc[i]);
b93b41d4 4051 kvfree(sbi->s_group_desc);
ac27a0ec 4052failed_mount:
0441984a
DW		 4053 if (sbi->s_chksum_driver)
4054 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4055#ifdef CONFIG_QUOTA
a2d4a646 4056 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4057 kfree(sbi->s_qf_names[i]);
4058#endif
617ba13b 4059 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4060 brelse(bh);
4061out_fail:
4062 sb->s_fs_info = NULL;
f6830165 4063 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4064 kfree(sbi);
dcc7dae3 4065out_free_orig:
d4c402d9 4066 kfree(orig_data);
07aa2ea1 4067 return err ? err : ret;
ac27a0ec
DK		 4068}
4069
4070/*
4071 * Setup any per-fs journal parameters now. We'll do this both on
4072 * initial mount, once the journal has been initialised but before we've
4073 * done any recovery; and again on any subsequent remount.
4074 */
617ba13b 4075static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4076{
617ba13b 4077 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4078
30773840
TT		 4079 journal->j_commit_interval = sbi->s_commit_interval;
4080 journal->j_min_batch_time = sbi->s_min_batch_time;
4081 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4082
a931da6a 4083 write_lock(&journal->j_state_lock);
ac27a0ec 4084 if (test_opt(sb, BARRIER))
dab291af 4085 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4086 else
dab291af 4087 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4088 if (test_opt(sb, DATA_ERR_ABORT))
4089 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4090 else
4091 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4092 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4093}
4094
617ba13b 4095static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4096 unsigned int journal_inum)
4097{
4098 struct inode *journal_inode;
4099 journal_t *journal;
4100
e2b911c5 4101 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4102
ac27a0ec
DK		 4103 /* First, test for the existence of a valid inode on disk. Bad
4104 * things happen if we iget() an unused inode, as the subsequent
4105 * iput() will try to delete it. */
4106
1d1fe1ee
DH		 4107 journal_inode = ext4_iget(sb, journal_inum);
4108 if (IS_ERR(journal_inode)) {
b31e1552 4109 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4110 return NULL;
4111 }
4112 if (!journal_inode->i_nlink) {
4113 make_bad_inode(journal_inode);
4114 iput(journal_inode);
b31e1552 4115 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4116 return NULL;
4117 }
4118
e5f8eab8 4119 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4120 journal_inode, journal_inode->i_size);
1d1fe1ee 4121 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4122 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4123 iput(journal_inode);
4124 return NULL;
4125 }
4126
dab291af 4127 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4128 if (!journal) {
b31e1552 4129 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4130 iput(journal_inode);
4131 return NULL;
4132 }
4133 journal->j_private = sb;
617ba13b 4134 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4135 return journal;
4136}
4137
617ba13b 4138static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4139 dev_t j_dev)
4140{
2b2d6d01 4141 struct buffer_head *bh;
ac27a0ec 4142 journal_t *journal;
617ba13b
MC		 4143 ext4_fsblk_t start;
4144 ext4_fsblk_t len;
ac27a0ec 4145 int hblock, blocksize;
617ba13b 4146 ext4_fsblk_t sb_block;
ac27a0ec 4147 unsigned long offset;
2b2d6d01 4148 struct ext4_super_block *es;
ac27a0ec
DK		 4149 struct block_device *bdev;
4150
e2b911c5 4151 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4152
b31e1552 4153 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4154 if (bdev == NULL)
4155 return NULL;
4156
ac27a0ec 4157 blocksize = sb->s_blocksize;
e1defc4f 4158 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4159 if (blocksize < hblock) {
b31e1552
ES		 4160 ext4_msg(sb, KERN_ERR,
4161 "blocksize too small for journal device");
ac27a0ec
DK		 4162 goto out_bdev;
4163 }
4164
617ba13b
MC		 4165 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4166 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4167 set_blocksize(bdev, blocksize);
4168 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4169 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4170 "external journal");
ac27a0ec
DK		 4171 goto out_bdev;
4172 }
4173
2716b802 4174 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4175 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4176 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4177 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4178 ext4_msg(sb, KERN_ERR, "external journal has "
4179 "bad superblock");
ac27a0ec
DK		 4180 brelse(bh);
4181 goto out_bdev;
4182 }
4183
df4763be
DW		 4184 if ((le32_to_cpu(es->s_feature_ro_compat) &
4185 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4186 es->s_checksum != ext4_superblock_csum(sb, es)) {
4187 ext4_msg(sb, KERN_ERR, "external journal has "
4188 "corrupt superblock");
4189 brelse(bh);
4190 goto out_bdev;
4191 }
4192
617ba13b 4193 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4194 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4195 brelse(bh);
4196 goto out_bdev;
4197 }
4198
bd81d8ee 4199 len = ext4_blocks_count(es);
ac27a0ec
DK		 4200 start = sb_block + 1;
4201 brelse(bh); /* we're done with the superblock */
4202
dab291af 4203 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4204 start, len, blocksize);
4205 if (!journal) {
b31e1552 4206 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4207 goto out_bdev;
4208 }
4209 journal->j_private = sb;
9f203507 4210 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4211 wait_on_buffer(journal->j_sb_buffer);
4212 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4213 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4214 goto out_journal;
4215 }
4216 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4217 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4218 "user (unsupported) - %d",
ac27a0ec
DK		 4219 be32_to_cpu(journal->j_superblock->s_nr_users));
4220 goto out_journal;
4221 }
617ba13b
MC		 4222 EXT4_SB(sb)->journal_bdev = bdev;
4223 ext4_init_journal_params(sb, journal);
ac27a0ec 4224 return journal;
0b8e58a1 4225
ac27a0ec 4226out_journal:
dab291af 4227 jbd2_journal_destroy(journal);
ac27a0ec 4228out_bdev:
617ba13b 4229 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4230 return NULL;
4231}
4232
617ba13b
MC		 4233static int ext4_load_journal(struct super_block *sb,
4234 struct ext4_super_block *es,
ac27a0ec
DK		 4235 unsigned long journal_devnum)
4236{
4237 journal_t *journal;
4238 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4239 dev_t journal_dev;
4240 int err = 0;
4241 int really_read_only;
4242
e2b911c5 4243 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4244
ac27a0ec
DK		 4245 if (journal_devnum &&
4246 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4247 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4248 "numbers have changed");
ac27a0ec
DK		 4249 journal_dev = new_decode_dev(journal_devnum);
4250 } else
4251 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4252
4253 really_read_only = bdev_read_only(sb->s_bdev);
4254
4255 /*
4256 * Are we loading a blank journal or performing recovery after a
4257 * crash? For recovery, we need to check in advance whether we
4258 * can get read-write access to the device.
4259 */
e2b911c5 4260 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4261 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4262 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4263 "required on readonly filesystem");
ac27a0ec 4264 if (really_read_only) {
b31e1552
ES		 4265 ext4_msg(sb, KERN_ERR, "write access "
4266 "unavailable, cannot proceed");
ac27a0ec
DK		 4267 return -EROFS;
4268 }
b31e1552
ES		 4269 ext4_msg(sb, KERN_INFO, "write access will "
4270 "be enabled during recovery");
ac27a0ec
DK		 4271 }
4272 }
4273
4274 if (journal_inum && journal_dev) {
b31e1552
ES		 4275 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4276 "and inode journals!");
ac27a0ec
DK		 4277 return -EINVAL;
4278 }
4279
4280 if (journal_inum) {
617ba13b 4281 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4282 return -EINVAL;
4283 } else {
617ba13b 4284 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4285 return -EINVAL;
4286 }
4287
90576c0b 4288 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4289 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4290
e2b911c5 4291 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4292 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4293 if (!err) {
4294 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4295 if (save)
4296 memcpy(save, ((char *) es) +
4297 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4298 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4299 if (save)
4300 memcpy(((char *) es) + EXT4_S_ERR_START,
4301 save, EXT4_S_ERR_LEN);
4302 kfree(save);
4303 }
ac27a0ec
DK		 4304
4305 if (err) {
b31e1552 4306 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4307 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4308 return err;
4309 }
4310
617ba13b
MC		 4311 EXT4_SB(sb)->s_journal = journal;
4312 ext4_clear_journal_err(sb, es);
ac27a0ec 4313
c41303ce 4314 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4315 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4316 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4317
4318 /* Make sure we flush the recovery flag to disk. */
e2d67052 4319 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4320 }
4321
4322 return 0;
4323}
4324
e2d67052 4325static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4326{
e2d67052 4327 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4328 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4329 int error = 0;
ac27a0ec 4330
bdfe0cbd 4331 if (!sbh || block_device_ejected(sb))
c4be0c1d 4332 return error;
914258bf
TT		 4333 if (buffer_write_io_error(sbh)) {
4334 /*
4335 * Oh, dear. A previous attempt to write the
4336 * superblock failed. This could happen because the
4337 * USB device was yanked out. Or it could happen to
4338 * be a transient write error and maybe the block will
4339 * be remapped. Nothing we can do but to retry the
4340 * write and hope for the best.
4341 */
b31e1552
ES		 4342 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4343 "superblock detected");
914258bf
TT		 4344 clear_buffer_write_io_error(sbh);
4345 set_buffer_uptodate(sbh);
4346 }
71290b36
TT		 4347 /*
4348 * If the file system is mounted read-only, don't update the
4349 * superblock write time. This avoids updating the superblock
4350 * write time when we are mounting the root file system
4351 * read/only but we need to replay the journal; at that point,
4352 * for people who are east of GMT and who make their clock
4353 * tick in localtime for Windows bug-for-bug compatibility,
4354 * the clock is set in the future, and this will cause e2fsck
4355 * to complain and force a full file system check.
4356 */
4357 if (!(sb->s_flags & MS_RDONLY))
4358 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4359 if (sb->s_bdev->bd_part)
4360 es->s_kbytes_written =
4361 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4362 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4363 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4364 else
4365 es->s_kbytes_written =
4366 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4367 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4368 ext4_free_blocks_count_set(es,
57042651
TT		 4369 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4370 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4371 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4372 es->s_free_inodes_count =
4373 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4374 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4375 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4376 ext4_superblock_csum_set(sb);
ac27a0ec 4377 mark_buffer_dirty(sbh);
914258bf 4378 if (sync) {
564bc402
DJ		 4379 error = __sync_dirty_buffer(sbh,
4380 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4381 if (error)
4382 return error;
4383
4384 error = buffer_write_io_error(sbh);
4385 if (error) {
b31e1552
ES		 4386 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4387 "superblock");
914258bf
TT		 4388 clear_buffer_write_io_error(sbh);
4389 set_buffer_uptodate(sbh);
4390 }
4391 }
c4be0c1d 4392 return error;
ac27a0ec
DK		 4393}
4394
ac27a0ec
DK		 4395/*
4396 * Have we just finished recovery? If so, and if we are mounting (or
4397 * remounting) the filesystem readonly, then we will end up with a
4398 * consistent fs on disk. Record that fact.
4399 */
2b2d6d01
TT		 4400static void ext4_mark_recovery_complete(struct super_block *sb,
4401 struct ext4_super_block *es)
ac27a0ec 4402{
617ba13b 4403 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4404
e2b911c5 4405 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4406 BUG_ON(journal != NULL);
4407 return;
4408 }
dab291af 4409 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4410 if (jbd2_journal_flush(journal) < 0)
4411 goto out;
4412
e2b911c5 4413 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4414 sb->s_flags & MS_RDONLY) {
e2b911c5 4415 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4416 ext4_commit_super(sb, 1);
ac27a0ec 4417 }
7ffe1ea8
HK		 4418
4419out:
dab291af 4420 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4421}
4422
4423/*
4424 * If we are mounting (or read-write remounting) a filesystem whose journal
4425 * has recorded an error from a previous lifetime, move that error to the
4426 * main filesystem now.
4427 */
2b2d6d01
TT		 4428static void ext4_clear_journal_err(struct super_block *sb,
4429 struct ext4_super_block *es)
ac27a0ec
DK		 4430{
4431 journal_t *journal;
4432 int j_errno;
4433 const char *errstr;
4434
e2b911c5 4435 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4436
617ba13b 4437 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4438
4439 /*
4440 * Now check for any error status which may have been recorded in the
617ba13b 4441 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4442 */
4443
dab291af 4444 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4445 if (j_errno) {
4446 char nbuf[16];
4447
617ba13b 4448 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4449 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4450 "from previous mount: %s", errstr);
12062ddd 4451 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4452
617ba13b
MC		 4453 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4454 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4455 ext4_commit_super(sb, 1);
ac27a0ec 4456
dab291af 4457 jbd2_journal_clear_err(journal);
d796c52e 4458 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4459 }
4460}
4461
4462/*
4463 * Force the running and committing transactions to commit,
4464 * and wait on the commit.
4465 */
617ba13b 4466int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4467{
4468 journal_t *journal;
ac27a0ec
DK		 4469
4470 if (sb->s_flags & MS_RDONLY)
4471 return 0;
4472
617ba13b 4473 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4474 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4475}
4476
617ba13b 4477static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4478{
14ce0cb4 4479 int ret = 0;
9eddacf9 4480 tid_t target;
06a407f1 4481 bool needs_barrier = false;
8d5d02e6 4482 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4483
9bffad1e 4484 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4485 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4486 /*
4487 * Writeback quota in non-journalled quota case - journalled quota has
4488 * no dirty dquots
4489 */
4490 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4491 /*
4492 * Data writeback is possible w/o journal transaction, so barrier must
4493 * being sent at the end of the function. But we can skip it if
4494 * transaction_commit will do it for us.
4495 */
bda32530
TT		 4496 if (sbi->s_journal) {
4497 target = jbd2_get_latest_transaction(sbi->s_journal);
4498 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4499 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4500 needs_barrier = true;
4501
4502 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4503 if (wait)
4504 ret = jbd2_log_wait_commit(sbi->s_journal,
4505 target);
4506 }
4507 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4508 needs_barrier = true;
06a407f1
DM		 4509 if (needs_barrier) {
4510 int err;
4511 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4512 if (!ret)
4513 ret = err;
0390131b 4514 }
06a407f1
DM		 4515
4516 return ret;
4517}
4518
ac27a0ec
DK		 4519/*
4520 * LVM calls this function before a (read-only) snapshot is created. This
4521 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4522 *
4523 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4524 * state independently. It relies on upper layer to stop all data & metadata
4525 * modifications.
ac27a0ec 4526 */
c4be0c1d 4527static int ext4_freeze(struct super_block *sb)
ac27a0ec 4528{
c4be0c1d
TS		 4529 int error = 0;
4530 journal_t *journal;
ac27a0ec 4531
9ca92389
TT		 4532 if (sb->s_flags & MS_RDONLY)
4533 return 0;
ac27a0ec 4534
9ca92389 4535 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4536
bb044576
TT		 4537 if (journal) {
4538 /* Now we set up the journal barrier. */
4539 jbd2_journal_lock_updates(journal);
ac27a0ec 4540
bb044576
TT		 4541 /*
4542 * Don't clear the needs_recovery flag if we failed to
4543 * flush the journal.
4544 */
4545 error = jbd2_journal_flush(journal);
4546 if (error < 0)
4547 goto out;
c642dc9e
ES		 4548
4549 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4550 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4551 }
9ca92389 4552
9ca92389 4553 error = ext4_commit_super(sb, 1);
6b0310fb 4554out:
bb044576
TT		 4555 if (journal)
4556 /* we rely on upper layer to stop further updates */
4557 jbd2_journal_unlock_updates(journal);
6b0310fb 4558 return error;
ac27a0ec
DK		 4559}
4560
4561/*
4562 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4563 * flag here, even though the filesystem is not technically dirty yet.
4564 */
c4be0c1d 4565static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4566{
9ca92389
TT		 4567 if (sb->s_flags & MS_RDONLY)
4568 return 0;
4569
c642dc9e
ES		 4570 if (EXT4_SB(sb)->s_journal) {
4571 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4572 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4573 }
4574
9ca92389 4575 ext4_commit_super(sb, 1);
c4be0c1d 4576 return 0;
ac27a0ec
DK		 4577}
4578
673c6100
TT		 4579/*
4580 * Structure to save mount options for ext4_remount's benefit
4581 */
4582struct ext4_mount_options {
4583 unsigned long s_mount_opt;
a2595b8a 4584 unsigned long s_mount_opt2;
08cefc7a
EB		 4585 kuid_t s_resuid;
4586 kgid_t s_resgid;
673c6100
TT		 4587 unsigned long s_commit_interval;
4588 u32 s_min_batch_time, s_max_batch_time;
4589#ifdef CONFIG_QUOTA
4590 int s_jquota_fmt;
a2d4a646 4591 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4592#endif
4593};
4594
2b2d6d01 4595static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4596{
2b2d6d01 4597 struct ext4_super_block *es;
617ba13b 4598 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4599 unsigned long old_sb_flags;
617ba13b 4600 struct ext4_mount_options old_opts;
c79d967d 4601 int enable_quota = 0;
8a266467 4602 ext4_group_t g;
b3881f74 4603 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4604 int err = 0;
ac27a0ec 4605#ifdef CONFIG_QUOTA
03dafb5f 4606 int i, j;
ac27a0ec 4607#endif
d4c402d9 4608 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4609
4610 /* Store the original options */
4611 old_sb_flags = sb->s_flags;
4612 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4613 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4614 old_opts.s_resuid = sbi->s_resuid;
4615 old_opts.s_resgid = sbi->s_resgid;
4616 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4617 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4618 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4619#ifdef CONFIG_QUOTA
4620 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4621 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4622 if (sbi->s_qf_names[i]) {
4623 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4624 GFP_KERNEL);
4625 if (!old_opts.s_qf_names[i]) {
4626 for (j = 0; j < i; j++)
4627 kfree(old_opts.s_qf_names[j]);
3e36a163 4628 kfree(orig_data);
03dafb5f
CG		 4629 return -ENOMEM;
4630 }
4631 } else
4632 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4633#endif
b3881f74
TT		 4634 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4635 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4636
661aa520 4637 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4638 err = -EINVAL;
4639 goto restore_opts;
4640 }
4641
6b992ff2 4642 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4643 test_opt(sb, JOURNAL_CHECKSUM)) {
4644 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4645 "during remount not supported; ignoring");
4646 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4647 }
4648
6ae6514b
PS		 4649 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4650 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4651 ext4_msg(sb, KERN_ERR, "can't mount with "
4652 "both data=journal and delalloc");
4653 err = -EINVAL;
4654 goto restore_opts;
4655 }
4656 if (test_opt(sb, DIOREAD_NOLOCK)) {
4657 ext4_msg(sb, KERN_ERR, "can't mount with "
4658 "both data=journal and dioread_nolock");
4659 err = -EINVAL;
4660 goto restore_opts;
4661 }
923ae0ff
RZ		 4662 if (test_opt(sb, DAX)) {
4663 ext4_msg(sb, KERN_ERR, "can't mount with "
4664 "both data=journal and dax");
4665 err = -EINVAL;
4666 goto restore_opts;
4667 }
4668 }
4669
4670 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4671 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4672 "dax flag with busy inodes while remounting");
4673 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4674 }
4675
4ab2f15b 4676 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4677 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4678
4679 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4680 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4681
4682 es = sbi->s_es;
4683
b3881f74 4684 if (sbi->s_journal) {
0390131b 4685 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4686 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4687 }
ac27a0ec 4688
a2fd66d0
TT		 4689 if (*flags & MS_LAZYTIME)
4690 sb->s_flags |= MS_LAZYTIME;
4691
661aa520 4692 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4693 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4694 err = -EROFS;
4695 goto restore_opts;
4696 }
4697
4698 if (*flags & MS_RDONLY) {
38c03b34
TT		 4699 err = sync_filesystem(sb);
4700 if (err < 0)
4701 goto restore_opts;
0f0dd62f
CH		 4702 err = dquot_suspend(sb, -1);
4703 if (err < 0)
c79d967d 4704 goto restore_opts;
c79d967d 4705
ac27a0ec
DK		 4706 /*
4707 * First of all, the unconditional stuff we have to do
4708 * to disable replay of the journal when we next remount
4709 */
4710 sb->s_flags |= MS_RDONLY;
4711
4712 /*
4713 * OK, test if we are remounting a valid rw partition
4714 * readonly, and if so set the rdonly flag and then
4715 * mark the partition as valid again.
4716 */
617ba13b
MC		 4717 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4718 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4719 es->s_state = cpu_to_le16(sbi->s_mount_state);
4720
a63c9eb2 4721 if (sbi->s_journal)
0390131b 4722 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4723 } else {
a13fb1a4 4724 /* Make sure we can mount this feature set readwrite */
e2b911c5 4725 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4726 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4727 err = -EROFS;
4728 goto restore_opts;
4729 }
8a266467
TT		 4730 /*
4731 * Make sure the group descriptor checksums
0b8e58a1 4732 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4733 */
4734 for (g = 0; g < sbi->s_groups_count; g++) {
4735 struct ext4_group_desc *gdp =
4736 ext4_get_group_desc(sb, g, NULL);
4737
feb0ab32 4738 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4739 ext4_msg(sb, KERN_ERR,
4740 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4741 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4742 le16_to_cpu(gdp->bg_checksum));
6a797d27 4743 err = -EFSBADCRC;
8a266467
TT		 4744 goto restore_opts;
4745 }
4746 }
4747
ead6596b
ES		 4748 /*
4749 * If we have an unprocessed orphan list hanging
4750 * around from a previously readonly bdev mount,
4751 * require a full umount/remount for now.
4752 */
4753 if (es->s_last_orphan) {
b31e1552 4754 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4755 "remount RDWR because of unprocessed "
4756 "orphan inode list. Please "
b31e1552 4757 "umount/remount instead");
ead6596b
ES		 4758 err = -EINVAL;
4759 goto restore_opts;
4760 }
4761
ac27a0ec
DK		 4762 /*
4763 * Mounting a RDONLY partition read-write, so reread
4764 * and store the current valid flag. (It may have
4765 * been changed by e2fsck since we originally mounted
4766 * the partition.)
4767 */
0390131b
FM		 4768 if (sbi->s_journal)
4769 ext4_clear_journal_err(sb, es);
ac27a0ec 4770 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4771 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4772 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4773 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4774 if (ext4_multi_mount_protect(sb,
4775 le64_to_cpu(es->s_mmp_block))) {
4776 err = -EROFS;
4777 goto restore_opts;
4778 }
c79d967d 4779 enable_quota = 1;
ac27a0ec
DK		 4780 }
4781 }
bfff6873
LC		 4782
4783 /*
4784 * Reinitialize lazy itable initialization thread based on
4785 * current settings
4786 */
4787 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4788 ext4_unregister_li_request(sb);
4789 else {
4790 ext4_group_t first_not_zeroed;
4791 first_not_zeroed = ext4_has_uninit_itable(sb);
4792 ext4_register_li_request(sb, first_not_zeroed);
4793 }
4794
6fd058f7 4795 ext4_setup_system_zone(sb);
d096ad0f 4796 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4797 ext4_commit_super(sb, 1);
0390131b 4798
ac27a0ec
DK		 4799#ifdef CONFIG_QUOTA
4800 /* Release old quota file names */
a2d4a646 4801 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4802 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4803 if (enable_quota) {
4804 if (sb_any_quota_suspended(sb))
4805 dquot_resume(sb, -1);
e2b911c5 4806 else if (ext4_has_feature_quota(sb)) {
7c319d32 4807 err = ext4_enable_quotas(sb);
07724f98 4808 if (err)
7c319d32 4809 goto restore_opts;
7c319d32
AK		 4810 }
4811 }
ac27a0ec 4812#endif
d4c402d9 4813
a26f4992 4814 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4815 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4816 kfree(orig_data);
ac27a0ec 4817 return 0;
0b8e58a1 4818
ac27a0ec
DK		 4819restore_opts:
4820 sb->s_flags = old_sb_flags;
4821 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4822 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4823 sbi->s_resuid = old_opts.s_resuid;
4824 sbi->s_resgid = old_opts.s_resgid;
4825 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4826 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4827 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4828#ifdef CONFIG_QUOTA
4829 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4830 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4831 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4832 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4833 }
4834#endif
d4c402d9 4835 kfree(orig_data);
ac27a0ec
DK		 4836 return err;
4837}
4838
689c958c
LX		 4839#ifdef CONFIG_QUOTA
4840static int ext4_statfs_project(struct super_block *sb,
4841 kprojid_t projid, struct kstatfs *buf)
4842{
4843 struct kqid qid;
4844 struct dquot *dquot;
4845 u64 limit;
4846 u64 curblock;
4847
4848 qid = make_kqid_projid(projid);
4849 dquot = dqget(sb, qid);
4850 if (IS_ERR(dquot))
4851 return PTR_ERR(dquot);
4852 spin_lock(&dq_data_lock);
4853
4854 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
4855 dquot->dq_dqb.dqb_bsoftlimit :
4856 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
4857 if (limit && buf->f_blocks > limit) {
4858 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
4859 buf->f_blocks = limit;
4860 buf->f_bfree = buf->f_bavail =
4861 (buf->f_blocks > curblock) ?
4862 (buf->f_blocks - curblock) : 0;
4863 }
4864
4865 limit = dquot->dq_dqb.dqb_isoftlimit ?
4866 dquot->dq_dqb.dqb_isoftlimit :
4867 dquot->dq_dqb.dqb_ihardlimit;
4868 if (limit && buf->f_files > limit) {
4869 buf->f_files = limit;
4870 buf->f_ffree =
4871 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
4872 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
4873 }
4874
4875 spin_unlock(&dq_data_lock);
4876 dqput(dquot);
4877 return 0;
4878}
4879#endif
4880
2b2d6d01 4881static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4882{
4883 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4884 struct ext4_sb_info *sbi = EXT4_SB(sb);
4885 struct ext4_super_block *es = sbi->s_es;
27dd4385 4886 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4887 u64 fsid;
d02a9391 4888 s64 bfree;
27dd4385 4889 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4890
952fc18e
TT		 4891 if (!test_opt(sb, MINIX_DF))
4892 overhead = sbi->s_overhead;
ac27a0ec 4893
617ba13b 4894 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4895 buf->f_bsize = sb->s_blocksize;
b72f78cb 4896 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4897 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4898 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4899 /* prevent underflow in case that few free space is available */
57042651 4900 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4901 buf->f_bavail = buf->f_bfree -
4902 (ext4_r_blocks_count(es) + resv_blocks);
4903 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4904 buf->f_bavail = 0;
4905 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4906 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4907 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4908 fsid = le64_to_cpup((void *)es->s_uuid) ^
4909 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4910 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4911 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4912
689c958c
LX		 4913#ifdef CONFIG_QUOTA
4914 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
4915 sb_has_quota_limits_enabled(sb, PRJQUOTA))
4916 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
4917#endif
ac27a0ec
DK		 4918 return 0;
4919}
4920
0b8e58a1
AD		 4921/* Helper function for writing quotas on sync - we need to start transaction
4922 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4923 * Process 1 Process 2
617ba13b 4924 * ext4_create() quota_sync()
a269eb18 4925 * jbd2_journal_start() write_dquot()
871a2931 4926 * dquot_initialize() down(dqio_mutex)
dab291af 4927 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4928 *
4929 */
4930
4931#ifdef CONFIG_QUOTA
4932
4933static inline struct inode *dquot_to_inode(struct dquot *dquot)
4934{
4c376dca 4935 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4936}
4937
617ba13b 4938static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4939{
4940 int ret, err;
4941 handle_t *handle;
4942 struct inode *inode;
4943
4944 inode = dquot_to_inode(dquot);
9924a92a 4945 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4946 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4947 if (IS_ERR(handle))
4948 return PTR_ERR(handle);
4949 ret = dquot_commit(dquot);
617ba13b 4950 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4951 if (!ret)
4952 ret = err;
4953 return ret;
4954}
4955
617ba13b 4956static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4957{
4958 int ret, err;
4959 handle_t *handle;
4960
9924a92a 4961 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4962 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4963 if (IS_ERR(handle))
4964 return PTR_ERR(handle);
4965 ret = dquot_acquire(dquot);
617ba13b 4966 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4967 if (!ret)
4968 ret = err;
4969 return ret;
4970}
4971
617ba13b 4972static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4973{
4974 int ret, err;
4975 handle_t *handle;
4976
9924a92a 4977 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4978 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4979 if (IS_ERR(handle)) {
4980 /* Release dquot anyway to avoid endless cycle in dqput() */
4981 dquot_release(dquot);
ac27a0ec 4982 return PTR_ERR(handle);
9c3013e9 4983 }
ac27a0ec 4984 ret = dquot_release(dquot);
617ba13b 4985 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4986 if (!ret)
4987 ret = err;
4988 return ret;
4989}
4990
617ba13b 4991static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4992{
262b4662
JK		 4993 struct super_block *sb = dquot->dq_sb;
4994 struct ext4_sb_info *sbi = EXT4_SB(sb);
4995
2c8be6b2 4996 /* Are we journaling quotas? */
e2b911c5 4997 if (ext4_has_feature_quota(sb) ||
262b4662 4998 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4999 dquot_mark_dquot_dirty(dquot);
617ba13b 5000 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5001 } else {
5002 return dquot_mark_dquot_dirty(dquot);
5003 }
5004}
5005
617ba13b 5006static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5007{
5008 int ret, err;
5009 handle_t *handle;
5010
5011 /* Data block + inode block */
2b0143b5 5012 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5013 if (IS_ERR(handle))
5014 return PTR_ERR(handle);
5015 ret = dquot_commit_info(sb, type);
617ba13b 5016 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5017 if (!ret)
5018 ret = err;
5019 return ret;
5020}
5021
5022/*
5023 * Turn on quotas during mount time - we need to find
5024 * the quota file and such...
5025 */
617ba13b 5026static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5027{
287a8095
CH		 5028 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5029 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5030}
5031
daf647d2
TT		 5032static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5033{
5034 struct ext4_inode_info *ei = EXT4_I(inode);
5035
5036 /* The first argument of lockdep_set_subclass has to be
5037 * *exactly* the same as the argument to init_rwsem() --- in
5038 * this case, in init_once() --- or lockdep gets unhappy
5039 * because the name of the lock is set using the
5040 * stringification of the argument to init_rwsem().
5041 */
5042 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5043 lockdep_set_subclass(&ei->i_data_sem, subclass);
5044}
5045
ac27a0ec
DK		 5046/*
5047 * Standard function to be called on quota_on
5048 */
617ba13b 5049static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5050 struct path *path)
ac27a0ec
DK		 5051{
5052 int err;
ac27a0ec
DK		 5053
5054 if (!test_opt(sb, QUOTA))
5055 return -EINVAL;
0623543b 5056
ac27a0ec 5057 /* Quotafile not on the same filesystem? */
d8c9584e 5058 if (path->dentry->d_sb != sb)
ac27a0ec 5059 return -EXDEV;
0623543b
JK		 5060 /* Journaling quota? */
5061 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5062 /* Quotafile not in fs root? */
f00c9e44 5063 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5064 ext4_msg(sb, KERN_WARNING,
5065 "Quota file not on filesystem root. "
5066 "Journaled quota will not work");
2b2d6d01 5067 }
0623543b
JK		 5068
5069 /*
5070 * When we journal data on quota file, we have to flush journal to see
5071 * all updates to the file when we bypass pagecache...
5072 */
0390131b 5073 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5074 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5075 /*
5076 * We don't need to lock updates but journal_flush() could
5077 * otherwise be livelocked...
5078 */
5079 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5080 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5081 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5082 if (err)
7ffe1ea8 5083 return err;
0623543b 5084 }
daf647d2
TT		 5085 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5086 err = dquot_quota_on(sb, type, format_id, path);
5087 if (err)
5088 lockdep_set_quota_inode(path->dentry->d_inode,
5089 I_DATA_SEM_NORMAL);
5090 return err;
ac27a0ec
DK		 5091}
5092
7c319d32
AK		 5093static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5094 unsigned int flags)
5095{
5096 int err;
5097 struct inode *qf_inode;
a2d4a646 5098 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5099 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5100 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5101 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5102 };
5103
e2b911c5 5104 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5105
5106 if (!qf_inums[type])
5107 return -EPERM;
5108
5109 qf_inode = ext4_iget(sb, qf_inums[type]);
5110 if (IS_ERR(qf_inode)) {
5111 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5112 return PTR_ERR(qf_inode);
5113 }
5114
bcb13850
JK		 5115 /* Don't account quota for quota files to avoid recursion */
5116 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5117 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5118 err = dquot_enable(qf_inode, type, format_id, flags);
5119 iput(qf_inode);
daf647d2
TT		 5120 if (err)
5121 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5122
5123 return err;
5124}
5125
5126/* Enable usage tracking for all quota types. */
5127static int ext4_enable_quotas(struct super_block *sb)
5128{
5129 int type, err = 0;
a2d4a646 5130 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5131 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5132 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5133 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5134 };
5135
5136 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5137 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5138 if (qf_inums[type]) {
5139 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5140 DQUOT_USAGE_ENABLED);
5141 if (err) {
5142 ext4_warning(sb,
72ba7450
TT		 5143 "Failed to enable quota tracking "
5144 "(type=%d, err=%d). Please run "
5145 "e2fsck to fix.", type, err);
7c319d32
AK		 5146 return err;
5147 }
5148 }
5149 }
5150 return 0;
5151}
5152
ca0e05e4
DM		 5153static int ext4_quota_off(struct super_block *sb, int type)
5154{
21f97697
JK		 5155 struct inode *inode = sb_dqopt(sb)->files[type];
5156 handle_t *handle;
5157
87009d86
DM		 5158 /* Force all delayed allocation blocks to be allocated.
5159 * Caller already holds s_umount sem */
5160 if (test_opt(sb, DELALLOC))
ca0e05e4 5161 sync_filesystem(sb);
ca0e05e4 5162
0b268590
AG		 5163 if (!inode)
5164 goto out;
5165
21f97697
JK		 5166 /* Update modification times of quota files when userspace can
5167 * start looking at them */
9924a92a 5168 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5169 if (IS_ERR(handle))
5170 goto out;
5171 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5172 ext4_mark_inode_dirty(handle, inode);
5173 ext4_journal_stop(handle);
5174
5175out:
ca0e05e4
DM		 5176 return dquot_quota_off(sb, type);
5177}
5178
ac27a0ec
DK		 5179/* Read data from quotafile - avoid pagecache and such because we cannot afford
5180 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5181 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5182 * we don't have to be afraid of races */
617ba13b 5183static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5184 size_t len, loff_t off)
5185{
5186 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5187 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5188 int offset = off & (sb->s_blocksize - 1);
5189 int tocopy;
5190 size_t toread;
5191 struct buffer_head *bh;
5192 loff_t i_size = i_size_read(inode);
5193
5194 if (off > i_size)
5195 return 0;
5196 if (off+len > i_size)
5197 len = i_size-off;
5198 toread = len;
5199 while (toread > 0) {
5200 tocopy = sb->s_blocksize - offset < toread ?
5201 sb->s_blocksize - offset : toread;
1c215028
TT		 5202 bh = ext4_bread(NULL, inode, blk, 0);
5203 if (IS_ERR(bh))
5204 return PTR_ERR(bh);
ac27a0ec
DK		 5205 if (!bh) /* A hole? */
5206 memset(data, 0, tocopy);
5207 else
5208 memcpy(data, bh->b_data+offset, tocopy);
5209 brelse(bh);
5210 offset = 0;
5211 toread -= tocopy;
5212 data += tocopy;
5213 blk++;
5214 }
5215 return len;
5216}
5217
5218/* Write to quotafile (we know the transaction is already started and has
5219 * enough credits) */
617ba13b 5220static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5221 const char *data, size_t len, loff_t off)
5222{
5223 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5224 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5225 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5226 int retries = 0;
ac27a0ec
DK		 5227 struct buffer_head *bh;
5228 handle_t *handle = journal_current_handle();
5229
0390131b 5230 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5231 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5232 " cancelled because transaction is not started",
9c3013e9
JK		 5233 (unsigned long long)off, (unsigned long long)len);
5234 return -EIO;
5235 }
67eeb568
DM		 5236 /*
5237 * Since we account only one data block in transaction credits,
5238 * then it is impossible to cross a block boundary.
5239 */
5240 if (sb->s_blocksize - offset < len) {
5241 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5242 " cancelled because not block aligned",
5243 (unsigned long long)off, (unsigned long long)len);
5244 return -EIO;
5245 }
5246
c5e298ae
TT		 5247 do {
5248 bh = ext4_bread(handle, inode, blk,
5249 EXT4_GET_BLOCKS_CREATE |
5250 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5251 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5252 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5253 if (IS_ERR(bh))
5254 return PTR_ERR(bh);
67eeb568
DM		 5255 if (!bh)
5256 goto out;
5d601255 5257 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5258 err = ext4_journal_get_write_access(handle, bh);
5259 if (err) {
5260 brelse(bh);
1c215028 5261 return err;
ac27a0ec 5262 }
67eeb568
DM		 5263 lock_buffer(bh);
5264 memcpy(bh->b_data+offset, data, len);
5265 flush_dcache_page(bh->b_page);
5266 unlock_buffer(bh);
62d2b5f2 5267 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5268 brelse(bh);
ac27a0ec 5269out:
67eeb568
DM		 5270 if (inode->i_size < off + len) {
5271 i_size_write(inode, off + len);
617ba13b 5272 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5273 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5274 }
67eeb568 5275 return len;
ac27a0ec
DK		 5276}
5277
8f0e8746
TT		 5278static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5279{
5280 const struct quota_format_ops *ops;
5281
5282 if (!sb_has_quota_loaded(sb, qid->type))
5283 return -ESRCH;
5284 ops = sb_dqopt(sb)->ops[qid->type];
5285 if (!ops || !ops->get_next_id)
5286 return -ENOSYS;
5287 return dquot_get_next_id(sb, qid);
5288}
ac27a0ec
DK		 5289#endif
5290
152a0836
AV		 5291static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5292 const char *dev_name, void *data)
ac27a0ec 5293{
152a0836 5294 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5295}
5296
c290ea01 5297#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5298static inline void register_as_ext2(void)
5299{
5300 int err = register_filesystem(&ext2_fs_type);
5301 if (err)
5302 printk(KERN_WARNING
5303 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5304}
5305
5306static inline void unregister_as_ext2(void)
5307{
5308 unregister_filesystem(&ext2_fs_type);
5309}
2035e776
TT		 5310
5311static inline int ext2_feature_set_ok(struct super_block *sb)
5312{
e2b911c5 5313 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5314 return 0;
5315 if (sb->s_flags & MS_RDONLY)
5316 return 1;
e2b911c5 5317 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5318 return 0;
5319 return 1;
5320}
24b58424
TT		 5321#else
5322static inline void register_as_ext2(void) { }
5323static inline void unregister_as_ext2(void) { }
2035e776 5324static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5325#endif
5326
24b58424
TT		 5327static inline void register_as_ext3(void)
5328{
5329 int err = register_filesystem(&ext3_fs_type);
5330 if (err)
5331 printk(KERN_WARNING
5332 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5333}
5334
5335static inline void unregister_as_ext3(void)
5336{
5337 unregister_filesystem(&ext3_fs_type);
5338}
2035e776
TT		 5339
5340static inline int ext3_feature_set_ok(struct super_block *sb)
5341{
e2b911c5 5342 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5343 return 0;
e2b911c5 5344 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5345 return 0;
5346 if (sb->s_flags & MS_RDONLY)
5347 return 1;
e2b911c5 5348 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5349 return 0;
5350 return 1;
5351}
24b58424 5352
03010a33
TT		 5353static struct file_system_type ext4_fs_type = {
5354 .owner = THIS_MODULE,
5355 .name = "ext4",
152a0836 5356 .mount = ext4_mount,
03010a33
TT		 5357 .kill_sb = kill_block_super,
5358 .fs_flags = FS_REQUIRES_DEV,
5359};
7f78e035 5360MODULE_ALIAS_FS("ext4");
03010a33 5361
e9e3bcec
ES		 5362/* Shared across all ext4 file systems */
5363wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5364
5dabfc78 5365static int __init ext4_init_fs(void)
ac27a0ec 5366{
e9e3bcec 5367 int i, err;
c9de560d 5368
e294a537 5369 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5370 ext4_li_info = NULL;
5371 mutex_init(&ext4_li_mtx);
5372
9a4c8019 5373 /* Build-time check for flags consistency */
12e9b892 5374 ext4_check_flag_values();
e9e3bcec 5375
e142d052 5376 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5377 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5378
51865fda 5379 err = ext4_init_es();
6fd058f7
TT		 5380 if (err)
5381 return err;
51865fda
ZL		 5382
5383 err = ext4_init_pageio();
5384 if (err)
b5799018 5385 goto out5;
51865fda 5386
5dabfc78 5387 err = ext4_init_system_zone();
bd2d0210 5388 if (err)
b5799018 5389 goto out4;
857ac889 5390
b5799018 5391 err = ext4_init_sysfs();
dd68314c 5392 if (err)
b5799018 5393 goto out3;
857ac889 5394
5dabfc78 5395 err = ext4_init_mballoc();
c9de560d
AT		 5396 if (err)
5397 goto out2;
ac27a0ec
DK		 5398 err = init_inodecache();
5399 if (err)
5400 goto out1;
24b58424 5401 register_as_ext3();
2035e776 5402 register_as_ext2();
03010a33 5403 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5404 if (err)
5405 goto out;
bfff6873 5406
ac27a0ec
DK		 5407 return 0;
5408out:
24b58424
TT		 5409 unregister_as_ext2();
5410 unregister_as_ext3();
ac27a0ec
DK		 5411 destroy_inodecache();
5412out1:
5dabfc78 5413 ext4_exit_mballoc();
9c191f70 5414out2:
b5799018
TT		 5415 ext4_exit_sysfs();
5416out3:
5dabfc78 5417 ext4_exit_system_zone();
b5799018 5418out4:
5dabfc78 5419 ext4_exit_pageio();
b5799018 5420out5:
51865fda
ZL		 5421 ext4_exit_es();
5422
ac27a0ec
DK		 5423 return err;
5424}
5425
5dabfc78 5426static void __exit ext4_exit_fs(void)
ac27a0ec 5427{
e298e73b 5428 ext4_exit_crypto();
bfff6873 5429 ext4_destroy_lazyinit_thread();
24b58424
TT		 5430 unregister_as_ext2();
5431 unregister_as_ext3();
03010a33 5432 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5433 destroy_inodecache();
5dabfc78 5434 ext4_exit_mballoc();
b5799018 5435 ext4_exit_sysfs();
5dabfc78
TT		 5436 ext4_exit_system_zone();
5437 ext4_exit_pageio();
dd12ed14 5438 ext4_exit_es();
ac27a0ec
DK		 5439}
5440
5441MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5442MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5443MODULE_LICENSE("GPL");
5dabfc78
TT		 5444module_init(ext4_init_fs)
5445module_exit(ext4_exit_fs)
Linux kernel - Deliverables
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