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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>
7c0f6ba6 41#include <linux/uaccess.h>
ac27a0ec 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);
c6cb7e77
EW		 81static struct inode *ext4_get_journal_inode(struct super_block *sb,
82 unsigned int journal_inum);
ac27a0ec 83
e74031fd
JK		 84/*
85 * Lock ordering
86 *
87 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
88 * i_mmap_rwsem (inode->i_mmap_rwsem)!
89 *
90 * page fault path:
91 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
92 * page lock -> i_data_sem (rw)
93 *
94 * buffered write path:
95 * sb_start_write -> i_mutex -> mmap_sem
96 * sb_start_write -> i_mutex -> transaction start -> page lock ->
97 * i_data_sem (rw)
98 *
99 * truncate:
100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
101 * i_mmap_rwsem (w) -> page lock
102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
103 * transaction start -> i_data_sem (rw)
104 *
105 * direct IO:
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
107 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
108 * transaction start -> i_data_sem (rw)
109 *
110 * writepages:
111 * transaction start -> page lock(s) -> i_data_sem (rw)
112 */
113
c290ea01 114#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 115static struct file_system_type ext2_fs_type = {
116 .owner = THIS_MODULE,
117 .name = "ext2",
118 .mount = ext4_mount,
119 .kill_sb = kill_block_super,
120 .fs_flags = FS_REQUIRES_DEV,
121};
7f78e035 122MODULE_ALIAS_FS("ext2");
fa7614dd 123MODULE_ALIAS("ext2");
2035e776
TT		 124#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
125#else
126#define IS_EXT2_SB(sb) (0)
127#endif
128
129
ba69f9ab
JK		 130static struct file_system_type ext3_fs_type = {
131 .owner = THIS_MODULE,
132 .name = "ext3",
152a0836 133 .mount = ext4_mount,
ba69f9ab
JK		 134 .kill_sb = kill_block_super,
135 .fs_flags = FS_REQUIRES_DEV,
136};
7f78e035 137MODULE_ALIAS_FS("ext3");
fa7614dd 138MODULE_ALIAS("ext3");
ba69f9ab 139#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 140
d25425f8
DW		 141static int ext4_verify_csum_type(struct super_block *sb,
142 struct ext4_super_block *es)
143{
e2b911c5 144 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 145 return 1;
146
147 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
148}
149
a9c47317
DW		 150static __le32 ext4_superblock_csum(struct super_block *sb,
151 struct ext4_super_block *es)
152{
153 struct ext4_sb_info *sbi = EXT4_SB(sb);
154 int offset = offsetof(struct ext4_super_block, s_checksum);
155 __u32 csum;
156
157 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
158
159 return cpu_to_le32(csum);
160}
161
c197855e
SH		 162static int ext4_superblock_csum_verify(struct super_block *sb,
163 struct ext4_super_block *es)
a9c47317 164{
9aa5d32b 165 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 166 return 1;
167
168 return es->s_checksum == ext4_superblock_csum(sb, es);
169}
170
06db49e6 171void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 172{
06db49e6
TT		 173 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
174
9aa5d32b 175 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 176 return;
177
178 es->s_checksum = ext4_superblock_csum(sb, es);
179}
180
9933fc0a
TT		 181void *ext4_kvmalloc(size_t size, gfp_t flags)
182{
183 void *ret;
184
8be04b93 185 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 186 if (!ret)
187 ret = __vmalloc(size, flags, PAGE_KERNEL);
188 return ret;
189}
190
191void *ext4_kvzalloc(size_t size, gfp_t flags)
192{
193 void *ret;
194
8be04b93 195 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 196 if (!ret)
197 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
198 return ret;
199}
200
8fadc143
AR		 201ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
202 struct ext4_group_desc *bg)
bd81d8ee 203{
3a14589c 204 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 206 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 207}
208
8fadc143
AR		 209ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
210 struct ext4_group_desc *bg)
bd81d8ee 211{
5272f837 212 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 214 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 215}
216
8fadc143
AR		 217ext4_fsblk_t ext4_inode_table(struct super_block *sb,
218 struct ext4_group_desc *bg)
bd81d8ee 219{
5272f837 220 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 222 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 223}
224
021b65bb
TT		 225__u32 ext4_free_group_clusters(struct super_block *sb,
226 struct ext4_group_desc *bg)
560671a0
AK		 227{
228 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 230 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 231}
232
233__u32 ext4_free_inodes_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235{
236 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 238 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 239}
240
241__u32 ext4_used_dirs_count(struct super_block *sb,
242 struct ext4_group_desc *bg)
243{
244 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
245 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 246 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 247}
248
249__u32 ext4_itable_unused_count(struct super_block *sb,
250 struct ext4_group_desc *bg)
251{
252 return le16_to_cpu(bg->bg_itable_unused_lo) |
253 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 254 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 255}
256
8fadc143
AR		 257void ext4_block_bitmap_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 259{
3a14589c 260 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 263}
264
8fadc143
AR		 265void ext4_inode_bitmap_set(struct super_block *sb,
266 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 267{
5272f837 268 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 271}
272
8fadc143
AR		 273void ext4_inode_table_set(struct super_block *sb,
274 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 275{
5272f837 276 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 279}
280
021b65bb
TT		 281void ext4_free_group_clusters_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 283{
284 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
287}
288
289void ext4_free_inodes_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291{
292 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
295}
296
297void ext4_used_dirs_set(struct super_block *sb,
298 struct ext4_group_desc *bg, __u32 count)
299{
300 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
301 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
302 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
303}
304
305void ext4_itable_unused_set(struct super_block *sb,
306 struct ext4_group_desc *bg, __u32 count)
307{
308 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
309 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
310 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
311}
312
d3d1faf6 313
1c13d5c0
TT		 314static void __save_error_info(struct super_block *sb, const char *func,
315 unsigned int line)
316{
317 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
318
319 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 320 if (bdev_read_only(sb->s_bdev))
321 return;
1c13d5c0
TT		 322 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
323 es->s_last_error_time = cpu_to_le32(get_seconds());
324 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
325 es->s_last_error_line = cpu_to_le32(line);
326 if (!es->s_first_error_time) {
327 es->s_first_error_time = es->s_last_error_time;
328 strncpy(es->s_first_error_func, func,
329 sizeof(es->s_first_error_func));
330 es->s_first_error_line = cpu_to_le32(line);
331 es->s_first_error_ino = es->s_last_error_ino;
332 es->s_first_error_block = es->s_last_error_block;
333 }
66e61a9e
TT		 334 /*
335 * Start the daily error reporting function if it hasn't been
336 * started already
337 */
338 if (!es->s_error_count)
339 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 340 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 341}
342
343static void save_error_info(struct super_block *sb, const char *func,
344 unsigned int line)
345{
346 __save_error_info(sb, func, line);
347 ext4_commit_super(sb, 1);
348}
349
bdfe0cbd
TT		 350/*
351 * The del_gendisk() function uninitializes the disk-specific data
352 * structures, including the bdi structure, without telling anyone
353 * else. Once this happens, any attempt to call mark_buffer_dirty()
354 * (for example, by ext4_commit_super), will cause a kernel OOPS.
355 * This is a kludge to prevent these oops until we can put in a proper
356 * hook in del_gendisk() to inform the VFS and file system layers.
357 */
358static int block_device_ejected(struct super_block *sb)
359{
360 struct inode *bd_inode = sb->s_bdev->bd_inode;
361 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
362
363 return bdi->dev == NULL;
364}
365
18aadd47
BJ		 366static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
367{
368 struct super_block *sb = journal->j_private;
369 struct ext4_sb_info *sbi = EXT4_SB(sb);
370 int error = is_journal_aborted(journal);
5d3ee208 371 struct ext4_journal_cb_entry *jce;
18aadd47 372
5d3ee208 373 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 374 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 375 while (!list_empty(&txn->t_private_list)) {
376 jce = list_entry(txn->t_private_list.next,
377 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 378 list_del_init(&jce->jce_list);
379 spin_unlock(&sbi->s_md_lock);
380 jce->jce_func(sb, jce, error);
381 spin_lock(&sbi->s_md_lock);
382 }
383 spin_unlock(&sbi->s_md_lock);
384}
1c13d5c0 385
ac27a0ec
DK		 386/* Deal with the reporting of failure conditions on a filesystem such as
387 * inconsistencies detected or read IO failures.
388 *
389 * On ext2, we can store the error state of the filesystem in the
617ba13b 390 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 391 * write ordering constraints on the superblock which prevent us from
392 * writing it out straight away; and given that the journal is about to
393 * be aborted, we can't rely on the current, or future, transactions to
394 * write out the superblock safely.
395 *
dab291af 396 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 397 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 398 * that error until we've noted it down and cleared it.
399 */
400
617ba13b 401static void ext4_handle_error(struct super_block *sb)
ac27a0ec 402{
ac27a0ec
DK		 403 if (sb->s_flags & MS_RDONLY)
404 return;
405
2b2d6d01 406 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 407 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 408
4ab2f15b 409 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 410 if (journal)
dab291af 411 jbd2_journal_abort(journal, -EIO);
ac27a0ec 412 }
2b2d6d01 413 if (test_opt(sb, ERRORS_RO)) {
b31e1552 414 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 415 /*
416 * Make sure updated value of ->s_mount_flags will be visible
417 * before ->s_flags update
418 */
419 smp_wmb();
ac27a0ec
DK		 420 sb->s_flags |= MS_RDONLY;
421 }
4327ba52
DJ		 422 if (test_opt(sb, ERRORS_PANIC)) {
423 if (EXT4_SB(sb)->s_journal &&
424 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
425 return;
617ba13b 426 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 427 sb->s_id);
4327ba52 428 }
ac27a0ec
DK		 429}
430
efbed4dc
TT		 431#define ext4_error_ratelimit(sb) \
432 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
433 "EXT4-fs error")
434
12062ddd 435void __ext4_error(struct super_block *sb, const char *function,
c398eda0 436 unsigned int line, const char *fmt, ...)
ac27a0ec 437{
0ff2ea7d 438 struct va_format vaf;
ac27a0ec
DK		 439 va_list args;
440
0db1ff22
TT		 441 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
442 return;
443
efbed4dc
TT		 444 if (ext4_error_ratelimit(sb)) {
445 va_start(args, fmt);
446 vaf.fmt = fmt;
447 vaf.va = &args;
448 printk(KERN_CRIT
449 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
450 sb->s_id, function, line, current->comm, &vaf);
451 va_end(args);
452 }
f3fc0210 453 save_error_info(sb, function, line);
617ba13b 454 ext4_handle_error(sb);
ac27a0ec
DK		 455}
456
e7c96e8e
JP		 457void __ext4_error_inode(struct inode *inode, const char *function,
458 unsigned int line, ext4_fsblk_t block,
459 const char *fmt, ...)
273df556
FM		 460{
461 va_list args;
f7c21177 462 struct va_format vaf;
1c13d5c0 463 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 464
0db1ff22
TT		 465 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
466 return;
467
1c13d5c0
TT		 468 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
469 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 470 if (ext4_error_ratelimit(inode->i_sb)) {
471 va_start(args, fmt);
472 vaf.fmt = fmt;
473 vaf.va = &args;
474 if (block)
475 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
476 "inode #%lu: block %llu: comm %s: %pV\n",
477 inode->i_sb->s_id, function, line, inode->i_ino,
478 block, current->comm, &vaf);
479 else
480 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
481 "inode #%lu: comm %s: %pV\n",
482 inode->i_sb->s_id, function, line, inode->i_ino,
483 current->comm, &vaf);
484 va_end(args);
485 }
1c13d5c0 486 save_error_info(inode->i_sb, function, line);
273df556
FM		 487 ext4_handle_error(inode->i_sb);
488}
489
e7c96e8e
JP		 490void __ext4_error_file(struct file *file, const char *function,
491 unsigned int line, ext4_fsblk_t block,
492 const char *fmt, ...)
273df556
FM		 493{
494 va_list args;
f7c21177 495 struct va_format vaf;
1c13d5c0 496 struct ext4_super_block *es;
496ad9aa 497 struct inode *inode = file_inode(file);
273df556
FM		 498 char pathname[80], *path;
499
0db1ff22
TT		 500 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
501 return;
502
1c13d5c0
TT		 503 es = EXT4_SB(inode->i_sb)->s_es;
504 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 505 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 506 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 507 if (IS_ERR(path))
508 path = "(unknown)";
509 va_start(args, fmt);
510 vaf.fmt = fmt;
511 vaf.va = &args;
512 if (block)
513 printk(KERN_CRIT
514 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
515 "block %llu: comm %s: path %s: %pV\n",
516 inode->i_sb->s_id, function, line, inode->i_ino,
517 block, current->comm, path, &vaf);
518 else
519 printk(KERN_CRIT
520 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
521 "comm %s: path %s: %pV\n",
522 inode->i_sb->s_id, function, line, inode->i_ino,
523 current->comm, path, &vaf);
524 va_end(args);
525 }
1c13d5c0 526 save_error_info(inode->i_sb, function, line);
273df556
FM		 527 ext4_handle_error(inode->i_sb);
528}
529
722887dd
TT		 530const char *ext4_decode_error(struct super_block *sb, int errno,
531 char nbuf[16])
ac27a0ec
DK		 532{
533 char *errstr = NULL;
534
535 switch (errno) {
6a797d27
DW		 536 case -EFSCORRUPTED:
537 errstr = "Corrupt filesystem";
538 break;
539 case -EFSBADCRC:
540 errstr = "Filesystem failed CRC";
541 break;
ac27a0ec
DK		 542 case -EIO:
543 errstr = "IO failure";
544 break;
545 case -ENOMEM:
546 errstr = "Out of memory";
547 break;
548 case -EROFS:
78f1ddbb
TT		 549 if (!sb || (EXT4_SB(sb)->s_journal &&
550 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 551 errstr = "Journal has aborted";
552 else
553 errstr = "Readonly filesystem";
554 break;
555 default:
556 /* If the caller passed in an extra buffer for unknown
557 * errors, textualise them now. Else we just return
558 * NULL. */
559 if (nbuf) {
560 /* Check for truncated error codes... */
561 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
562 errstr = nbuf;
563 }
564 break;
565 }
566
567 return errstr;
568}
569
617ba13b 570/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 571 * automatically and invokes the appropriate error response. */
572
c398eda0
TT		 573void __ext4_std_error(struct super_block *sb, const char *function,
574 unsigned int line, int errno)
ac27a0ec
DK		 575{
576 char nbuf[16];
577 const char *errstr;
578
0db1ff22
TT		 579 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
580 return;
581
ac27a0ec
DK		 582 /* Special case: if the error is EROFS, and we're not already
583 * inside a transaction, then there's really no point in logging
584 * an error. */
585 if (errno == -EROFS && journal_current_handle() == NULL &&
586 (sb->s_flags & MS_RDONLY))
587 return;
588
efbed4dc
TT		 589 if (ext4_error_ratelimit(sb)) {
590 errstr = ext4_decode_error(sb, errno, nbuf);
591 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
592 sb->s_id, function, line, errstr);
593 }
ac27a0ec 594
efbed4dc 595 save_error_info(sb, function, line);
617ba13b 596 ext4_handle_error(sb);
ac27a0ec
DK		 597}
598
599/*
617ba13b 600 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 601 * abort function may be used to deal with unrecoverable failures such
602 * as journal IO errors or ENOMEM at a critical moment in log management.
603 *
604 * We unconditionally force the filesystem into an ABORT|READONLY state,
605 * unless the error response on the fs has been set to panic in which
606 * case we take the easy way out and panic immediately.
607 */
608
c67d859e 609void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 610 unsigned int line, const char *fmt, ...)
ac27a0ec 611{
651e1c3b 612 struct va_format vaf;
ac27a0ec
DK		 613 va_list args;
614
0db1ff22
TT		 615 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
616 return;
617
1c13d5c0 618 save_error_info(sb, function, line);
ac27a0ec 619 va_start(args, fmt);
651e1c3b
JP		 620 vaf.fmt = fmt;
621 vaf.va = &args;
622 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
623 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 624 va_end(args);
625
1c13d5c0
TT		 626 if ((sb->s_flags & MS_RDONLY) == 0) {
627 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 628 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 629 /*
630 * Make sure updated value of ->s_mount_flags will be visible
631 * before ->s_flags update
632 */
633 smp_wmb();
634 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 635 if (EXT4_SB(sb)->s_journal)
636 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
637 save_error_info(sb, function, line);
638 }
4327ba52
DJ		 639 if (test_opt(sb, ERRORS_PANIC)) {
640 if (EXT4_SB(sb)->s_journal &&
641 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
642 return;
617ba13b 643 panic("EXT4-fs panic from previous error\n");
4327ba52 644 }
ac27a0ec
DK		 645}
646
e7c96e8e
JP		 647void __ext4_msg(struct super_block *sb,
648 const char *prefix, const char *fmt, ...)
b31e1552 649{
0ff2ea7d 650 struct va_format vaf;
b31e1552
ES		 651 va_list args;
652
efbed4dc
TT		 653 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
654 return;
655
b31e1552 656 va_start(args, fmt);
0ff2ea7d
JP		 657 vaf.fmt = fmt;
658 vaf.va = &args;
659 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 660 va_end(args);
661}
662
b03a2f7e
AD		 663#define ext4_warning_ratelimit(sb) \
664 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
665 "EXT4-fs warning")
666
12062ddd 667void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 668 unsigned int line, const char *fmt, ...)
ac27a0ec 669{
0ff2ea7d 670 struct va_format vaf;
ac27a0ec
DK		 671 va_list args;
672
b03a2f7e 673 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 674 return;
675
ac27a0ec 676 va_start(args, fmt);
0ff2ea7d
JP		 677 vaf.fmt = fmt;
678 vaf.va = &args;
679 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
680 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 681 va_end(args);
682}
683
b03a2f7e
AD		 684void __ext4_warning_inode(const struct inode *inode, const char *function,
685 unsigned int line, const char *fmt, ...)
686{
687 struct va_format vaf;
688 va_list args;
689
690 if (!ext4_warning_ratelimit(inode->i_sb))
691 return;
692
693 va_start(args, fmt);
694 vaf.fmt = fmt;
695 vaf.va = &args;
696 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
697 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
698 function, line, inode->i_ino, current->comm, &vaf);
699 va_end(args);
700}
701
e29136f8
TT		 702void __ext4_grp_locked_error(const char *function, unsigned int line,
703 struct super_block *sb, ext4_group_t grp,
704 unsigned long ino, ext4_fsblk_t block,
705 const char *fmt, ...)
5d1b1b3f
AK		 706__releases(bitlock)
707__acquires(bitlock)
708{
0ff2ea7d 709 struct va_format vaf;
5d1b1b3f
AK		 710 va_list args;
711 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
712
0db1ff22
TT		 713 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
714 return;
715
1c13d5c0
TT		 716 es->s_last_error_ino = cpu_to_le32(ino);
717 es->s_last_error_block = cpu_to_le64(block);
718 __save_error_info(sb, function, line);
0ff2ea7d 719
efbed4dc
TT		 720 if (ext4_error_ratelimit(sb)) {
721 va_start(args, fmt);
722 vaf.fmt = fmt;
723 vaf.va = &args;
724 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
725 sb->s_id, function, line, grp);
726 if (ino)
727 printk(KERN_CONT "inode %lu: ", ino);
728 if (block)
729 printk(KERN_CONT "block %llu:",
730 (unsigned long long) block);
731 printk(KERN_CONT "%pV\n", &vaf);
732 va_end(args);
733 }
5d1b1b3f
AK		 734
735 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 736 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 737 return;
738 }
1c13d5c0 739
5d1b1b3f
AK		 740 ext4_unlock_group(sb, grp);
741 ext4_handle_error(sb);
742 /*
743 * We only get here in the ERRORS_RO case; relocking the group
744 * may be dangerous, but nothing bad will happen since the
745 * filesystem will have already been marked read/only and the
746 * journal has been aborted. We return 1 as a hint to callers
747 * who might what to use the return value from
25985edc 748 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 749 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
750 * aggressively from the ext4 function in question, with a
751 * more appropriate error code.
752 */
753 ext4_lock_group(sb, grp);
754 return;
755}
756
617ba13b 757void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 758{
617ba13b 759 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 760
617ba13b 761 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 762 return;
763
12062ddd 764 ext4_warning(sb,
ac27a0ec
DK		 765 "updating to rev %d because of new feature flag, "
766 "running e2fsck is recommended",
617ba13b 767 EXT4_DYNAMIC_REV);
ac27a0ec 768
617ba13b
MC		 769 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
770 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
771 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 772 /* leave es->s_feature_*compat flags alone */
773 /* es->s_uuid will be set by e2fsck if empty */
774
775 /*
776 * The rest of the superblock fields should be zero, and if not it
777 * means they are likely already in use, so leave them alone. We
778 * can leave it up to e2fsck to clean up any inconsistencies there.
779 */
780}
781
782/*
783 * Open the external journal device
784 */
b31e1552 785static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 786{
787 struct block_device *bdev;
788 char b[BDEVNAME_SIZE];
789
d4d77629 790 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 791 if (IS_ERR(bdev))
792 goto fail;
793 return bdev;
794
795fail:
b31e1552 796 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 797 __bdevname(dev, b), PTR_ERR(bdev));
798 return NULL;
799}
800
801/*
802 * Release the journal device
803 */
4385bab1 804static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 805{
4385bab1 806 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 807}
808
4385bab1 809static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 810{
811 struct block_device *bdev;
ac27a0ec
DK		 812 bdev = sbi->journal_bdev;
813 if (bdev) {
4385bab1 814 ext4_blkdev_put(bdev);
ac27a0ec
DK		 815 sbi->journal_bdev = NULL;
816 }
ac27a0ec
DK		 817}
818
819static inline struct inode *orphan_list_entry(struct list_head *l)
820{
617ba13b 821 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 822}
823
617ba13b 824static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 825{
826 struct list_head *l;
827
b31e1552
ES		 828 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
829 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 830
831 printk(KERN_ERR "sb_info orphan list:\n");
832 list_for_each(l, &sbi->s_orphan) {
833 struct inode *inode = orphan_list_entry(l);
834 printk(KERN_ERR " "
835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
836 inode->i_sb->s_id, inode->i_ino, inode,
837 inode->i_mode, inode->i_nlink,
838 NEXT_ORPHAN(inode));
839 }
840}
841
2b2d6d01 842static void ext4_put_super(struct super_block *sb)
ac27a0ec 843{
617ba13b
MC		 844 struct ext4_sb_info *sbi = EXT4_SB(sb);
845 struct ext4_super_block *es = sbi->s_es;
97abd7d4 846 int aborted = 0;
ef2cabf7 847 int i, err;
ac27a0ec 848
857ac889 849 ext4_unregister_li_request(sb);
e0ccfd95
CH		 850 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
851
2e8fa54e 852 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 853 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 854
0390131b 855 if (sbi->s_journal) {
97abd7d4 856 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 857 err = jbd2_journal_destroy(sbi->s_journal);
858 sbi->s_journal = NULL;
97abd7d4 859 if ((err < 0) && !aborted)
c67d859e 860 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 861 }
d4edac31 862
ebd173be 863 ext4_unregister_sysfs(sb);
d3922a77 864 ext4_es_unregister_shrinker(sbi);
9105bb14 865 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 866 ext4_release_system_zone(sb);
867 ext4_mb_release(sb);
868 ext4_ext_release(sb);
d4edac31 869
97abd7d4 870 if (!(sb->s_flags & MS_RDONLY) && !aborted) {
e2b911c5 871 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 872 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 873 }
58c5873a 874 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 875 ext4_commit_super(sb, 1);
876
ac27a0ec
DK		 877 for (i = 0; i < sbi->s_gdb_count; i++)
878 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 879 kvfree(sbi->s_group_desc);
880 kvfree(sbi->s_flex_groups);
57042651 881 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 882 percpu_counter_destroy(&sbi->s_freeinodes_counter);
883 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 884 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 885 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 886#ifdef CONFIG_QUOTA
a2d4a646 887 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 888 kfree(sbi->s_qf_names[i]);
889#endif
890
891 /* Debugging code just in case the in-memory inode orphan list
892 * isn't empty. The on-disk one can be non-empty if we've
893 * detected an error and taken the fs readonly, but the
894 * in-memory list had better be clean by this point. */
895 if (!list_empty(&sbi->s_orphan))
896 dump_orphan_list(sb, sbi);
897 J_ASSERT(list_empty(&sbi->s_orphan));
898
89d96a6f 899 sync_blockdev(sb->s_bdev);
f98393a6 900 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 901 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
902 /*
903 * Invalidate the journal device's buffers. We don't want them
904 * floating about in memory - the physical journal device may
905 * hotswapped, and it breaks the `ro-after' testing code.
906 */
907 sync_blockdev(sbi->journal_bdev);
f98393a6 908 invalidate_bdev(sbi->journal_bdev);
617ba13b 909 ext4_blkdev_remove(sbi);
ac27a0ec 910 }
9c191f70
M		 911 if (sbi->s_mb_cache) {
912 ext4_xattr_destroy_cache(sbi->s_mb_cache);
913 sbi->s_mb_cache = NULL;
914 }
c5e06d10
JL		 915 if (sbi->s_mmp_tsk)
916 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 917 brelse(sbi->s_sbh);
ac27a0ec 918 sb->s_fs_info = NULL;
3197ebdb
TT		 919 /*
920 * Now that we are completely done shutting down the
921 * superblock, we need to actually destroy the kobject.
922 */
3197ebdb
TT		 923 kobject_put(&sbi->s_kobj);
924 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 925 if (sbi->s_chksum_driver)
926 crypto_free_shash(sbi->s_chksum_driver);
705895b6 927 kfree(sbi->s_blockgroup_lock);
ac27a0ec 928 kfree(sbi);
ac27a0ec
DK		 929}
930
e18b890b 931static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 932
933/*
934 * Called inside transaction, so use GFP_NOFS
935 */
617ba13b 936static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 937{
617ba13b 938 struct ext4_inode_info *ei;
ac27a0ec 939
e6b4f8da 940 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 941 if (!ei)
942 return NULL;
0b8e58a1 943
ac27a0ec 944 ei->vfs_inode.i_version = 1;
202ee5df 945 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 946 INIT_LIST_HEAD(&ei->i_prealloc_list);
947 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 948 ext4_es_init_tree(&ei->i_es_tree);
949 rwlock_init(&ei->i_es_lock);
edaa53ca 950 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 951 ei->i_es_all_nr = 0;
edaa53ca 952 ei->i_es_shk_nr = 0;
dd475925 953 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 954 ei->i_reserved_data_blocks = 0;
955 ei->i_reserved_meta_blocks = 0;
956 ei->i_allocated_meta_blocks = 0;
9d0be502 957 ei->i_da_metadata_calc_len = 0;
7e731bc9 958 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 959 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 960#ifdef CONFIG_QUOTA
961 ei->i_reserved_quota = 0;
96c7e0d9 962 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 963#endif
8aefcd55 964 ei->jinode = NULL;
2e8fa54e 965 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 966 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 967 ei->i_sync_tid = 0;
968 ei->i_datasync_tid = 0;
e27f41e1 969 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 970 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 971 return &ei->vfs_inode;
972}
973
7ff9c073
TT		 974static int ext4_drop_inode(struct inode *inode)
975{
976 int drop = generic_drop_inode(inode);
977
978 trace_ext4_drop_inode(inode, drop);
979 return drop;
980}
981
fa0d7e3d
NP		 982static void ext4_i_callback(struct rcu_head *head)
983{
984 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 985 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
986}
987
617ba13b 988static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 989{
9f7dd93d 990 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 991 ext4_msg(inode->i_sb, KERN_ERR,
992 "Inode %lu (%p): orphan list check failed!",
993 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 994 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
995 EXT4_I(inode), sizeof(struct ext4_inode_info),
996 true);
997 dump_stack();
998 }
fa0d7e3d 999 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1000}
1001
51cc5068 1002static void init_once(void *foo)
ac27a0ec 1003{
617ba13b 1004 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1005
a35afb83 1006 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1007 init_rwsem(&ei->xattr_sem);
0e855ac8 1008 init_rwsem(&ei->i_data_sem);
ea3d7209 1009 init_rwsem(&ei->i_mmap_sem);
a35afb83 1010 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1011}
1012
e67bc2b3 1013static int __init init_inodecache(void)
ac27a0ec 1014{
617ba13b
MC		 1015 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1016 sizeof(struct ext4_inode_info),
ac27a0ec 1017 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1018 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 1019 init_once);
617ba13b 1020 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1021 return -ENOMEM;
1022 return 0;
1023}
1024
1025static void destroy_inodecache(void)
1026{
8c0a8537
KS		 1027 /*
1028 * Make sure all delayed rcu free inodes are flushed before we
1029 * destroy cache.
1030 */
1031 rcu_barrier();
617ba13b 1032 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1033}
1034
0930fcc1 1035void ext4_clear_inode(struct inode *inode)
ac27a0ec 1036{
0930fcc1 1037 invalidate_inode_buffers(inode);
dbd5768f 1038 clear_inode(inode);
9f754758 1039 dquot_drop(inode);
c2ea3fde 1040 ext4_discard_preallocations(inode);
51865fda 1041 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1042 if (EXT4_I(inode)->jinode) {
1043 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1044 EXT4_I(inode)->jinode);
1045 jbd2_free_inode(EXT4_I(inode)->jinode);
1046 EXT4_I(inode)->jinode = NULL;
1047 }
b7236e21 1048#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 1049 fscrypt_put_encryption_info(inode, NULL);
b7236e21 1050#endif
ac27a0ec
DK		 1051}
1052
1b961ac0 1053static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1054 u64 ino, u32 generation)
ac27a0ec 1055{
ac27a0ec 1056 struct inode *inode;
ac27a0ec 1057
617ba13b 1058 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1059 return ERR_PTR(-ESTALE);
617ba13b 1060 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1061 return ERR_PTR(-ESTALE);
1062
1063 /* iget isn't really right if the inode is currently unallocated!!
1064 *
617ba13b 1065 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1066 * deleted, so we should be safe.
1067 *
1068 * Currently we don't know the generation for parent directory, so
1069 * a generation of 0 means "accept any"
1070 */
f4bb2981 1071 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1072 if (IS_ERR(inode))
1073 return ERR_CAST(inode);
1074 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1075 iput(inode);
1076 return ERR_PTR(-ESTALE);
1077 }
1b961ac0
CH		 1078
1079 return inode;
1080}
1081
1082static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1083 int fh_len, int fh_type)
1b961ac0
CH		 1084{
1085 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1086 ext4_nfs_get_inode);
1087}
1088
1089static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1090 int fh_len, int fh_type)
1b961ac0
CH		 1091{
1092 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1093 ext4_nfs_get_inode);
ac27a0ec
DK		 1094}
1095
c39a7f84
TO		 1096/*
1097 * Try to release metadata pages (indirect blocks, directories) which are
1098 * mapped via the block device. Since these pages could have journal heads
1099 * which would prevent try_to_free_buffers() from freeing them, we must use
1100 * jbd2 layer's try_to_free_buffers() function to release them.
1101 */
0b8e58a1
AD		 1102static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1103 gfp_t wait)
c39a7f84
TO		 1104{
1105 journal_t *journal = EXT4_SB(sb)->s_journal;
1106
1107 WARN_ON(PageChecked(page));
1108 if (!page_has_buffers(page))
1109 return 0;
1110 if (journal)
1111 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1112 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1113 return try_to_free_buffers(page);
1114}
1115
a7550b30
JK		 1116#ifdef CONFIG_EXT4_FS_ENCRYPTION
1117static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1118{
1119 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1120 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1121}
1122
a7550b30
JK		 1123static int ext4_prepare_context(struct inode *inode)
1124{
1125 return ext4_convert_inline_data(inode);
1126}
1127
1128static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1129 void *fs_data)
1130{
2f8f5e76
EB		 1131 handle_t *handle = fs_data;
1132 int res, res2, retries = 0;
1133
1134 /*
1135 * If a journal handle was specified, then the encryption context is
1136 * being set on a new inode via inheritance and is part of a larger
1137 * transaction to create the inode. Otherwise the encryption context is
1138 * being set on an existing inode in its own transaction. Only in the
1139 * latter case should the "retry on ENOSPC" logic be used.
1140 */
a7550b30 1141
2f8f5e76
EB		 1142 if (handle) {
1143 res = ext4_xattr_set_handle(handle, inode,
1144 EXT4_XATTR_INDEX_ENCRYPTION,
1145 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1146 ctx, len, 0);
a7550b30
JK		 1147 if (!res) {
1148 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1149 ext4_clear_inode_state(inode,
1150 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b
JK		 1151 /*
1152 * Update inode->i_flags - e.g. S_DAX may get disabled
1153 */
1154 ext4_set_inode_flags(inode);
a7550b30
JK		 1155 }
1156 return res;
1157 }
1158
2f8f5e76 1159retry:
a7550b30
JK		 1160 handle = ext4_journal_start(inode, EXT4_HT_MISC,
1161 ext4_jbd2_credits_xattr(inode));
1162 if (IS_ERR(handle))
1163 return PTR_ERR(handle);
1164
2f8f5e76
EB		 1165 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1166 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1167 ctx, len, 0);
a7550b30
JK		 1168 if (!res) {
1169 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
a3caa24b
JK		 1170 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1171 ext4_set_inode_flags(inode);
a7550b30
JK		 1172 res = ext4_mark_inode_dirty(handle, inode);
1173 if (res)
1174 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1175 }
1176 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1177
1178 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1179 goto retry;
a7550b30
JK		 1180 if (!res)
1181 res = res2;
1182 return res;
1183}
1184
1185static int ext4_dummy_context(struct inode *inode)
1186{
1187 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1188}
1189
1190static unsigned ext4_max_namelen(struct inode *inode)
1191{
1192 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1193 EXT4_NAME_LEN;
1194}
1195
6f69f0ed 1196static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1197 .key_prefix = "ext4:",
a7550b30 1198 .get_context = ext4_get_context,
a7550b30
JK		 1199 .prepare_context = ext4_prepare_context,
1200 .set_context = ext4_set_context,
1201 .dummy_context = ext4_dummy_context,
1202 .is_encrypted = ext4_encrypted_inode,
1203 .empty_dir = ext4_empty_dir,
1204 .max_namelen = ext4_max_namelen,
1205};
1206#else
6f69f0ed 1207static const struct fscrypt_operations ext4_cryptops = {
a7550b30
JK		 1208 .is_encrypted = ext4_encrypted_inode,
1209};
1210#endif
1211
ac27a0ec 1212#ifdef CONFIG_QUOTA
689c958c
LX		 1213static char *quotatypes[] = INITQFNAMES;
1214#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1215
617ba13b
MC		 1216static int ext4_write_dquot(struct dquot *dquot);
1217static int ext4_acquire_dquot(struct dquot *dquot);
1218static int ext4_release_dquot(struct dquot *dquot);
1219static int ext4_mark_dquot_dirty(struct dquot *dquot);
1220static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1221static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1222 const struct path *path);
ca0e05e4 1223static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1224static int ext4_quota_on_mount(struct super_block *sb, int type);
1225static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1226 size_t len, loff_t off);
617ba13b 1227static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1228 const char *data, size_t len, loff_t off);
7c319d32
AK		 1229static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1230 unsigned int flags);
1231static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1232static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1233
96c7e0d9
JK		 1234static struct dquot **ext4_get_dquots(struct inode *inode)
1235{
1236 return EXT4_I(inode)->i_dquot;
1237}
1238
61e225dc 1239static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1240 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1241 .write_dquot = ext4_write_dquot,
1242 .acquire_dquot = ext4_acquire_dquot,
1243 .release_dquot = ext4_release_dquot,
1244 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1245 .write_info = ext4_write_info,
1246 .alloc_dquot = dquot_alloc,
1247 .destroy_dquot = dquot_destroy,
040cb378 1248 .get_projid = ext4_get_projid,
8f0e8746 1249 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1250};
1251
0d54b217 1252static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1253 .quota_on = ext4_quota_on,
ca0e05e4 1254 .quota_off = ext4_quota_off,
287a8095 1255 .quota_sync = dquot_quota_sync,
0a240339 1256 .get_state = dquot_get_state,
287a8095
CH		 1257 .set_info = dquot_set_dqinfo,
1258 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1259 .set_dqblk = dquot_set_dqblk,
1260 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1261};
1262#endif
1263
ee9b6d61 1264static const struct super_operations ext4_sops = {
617ba13b
MC		 1265 .alloc_inode = ext4_alloc_inode,
1266 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1267 .write_inode = ext4_write_inode,
1268 .dirty_inode = ext4_dirty_inode,
7ff9c073 1269 .drop_inode = ext4_drop_inode,
0930fcc1 1270 .evict_inode = ext4_evict_inode,
617ba13b 1271 .put_super = ext4_put_super,
617ba13b 1272 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1273 .freeze_fs = ext4_freeze,
1274 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1275 .statfs = ext4_statfs,
1276 .remount_fs = ext4_remount,
617ba13b 1277 .show_options = ext4_show_options,
ac27a0ec 1278#ifdef CONFIG_QUOTA
617ba13b
MC		 1279 .quota_read = ext4_quota_read,
1280 .quota_write = ext4_quota_write,
96c7e0d9 1281 .get_dquots = ext4_get_dquots,
ac27a0ec 1282#endif
c39a7f84 1283 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1284};
1285
39655164 1286static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1287 .fh_to_dentry = ext4_fh_to_dentry,
1288 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1289 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1290};
1291
1292enum {
1293 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1294 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1295 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1296 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1297 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1298 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1299 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1300 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1301 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1302 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1303 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1304 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1305 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1449032b 1306 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
670e9875 1307 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1308 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1309 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1310 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1311 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1312 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1313};
1314
a447c093 1315static const match_table_t tokens = {
ac27a0ec
DK		 1316 {Opt_bsd_df, "bsddf"},
1317 {Opt_minix_df, "minixdf"},
1318 {Opt_grpid, "grpid"},
1319 {Opt_grpid, "bsdgroups"},
1320 {Opt_nogrpid, "nogrpid"},
1321 {Opt_nogrpid, "sysvgroups"},
1322 {Opt_resgid, "resgid=%u"},
1323 {Opt_resuid, "resuid=%u"},
1324 {Opt_sb, "sb=%u"},
1325 {Opt_err_cont, "errors=continue"},
1326 {Opt_err_panic, "errors=panic"},
1327 {Opt_err_ro, "errors=remount-ro"},
1328 {Opt_nouid32, "nouid32"},
ac27a0ec 1329 {Opt_debug, "debug"},
72578c33
TT		 1330 {Opt_removed, "oldalloc"},
1331 {Opt_removed, "orlov"},
ac27a0ec
DK		 1332 {Opt_user_xattr, "user_xattr"},
1333 {Opt_nouser_xattr, "nouser_xattr"},
1334 {Opt_acl, "acl"},
1335 {Opt_noacl, "noacl"},
e3bb52ae 1336 {Opt_noload, "norecovery"},
5a916be1 1337 {Opt_noload, "noload"},
72578c33
TT		 1338 {Opt_removed, "nobh"},
1339 {Opt_removed, "bh"},
ac27a0ec 1340 {Opt_commit, "commit=%u"},
30773840
TT		 1341 {Opt_min_batch_time, "min_batch_time=%u"},
1342 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1343 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1344 {Opt_journal_path, "journal_path=%s"},
818d276c 1345 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1346 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1347 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1348 {Opt_abort, "abort"},
1349 {Opt_data_journal, "data=journal"},
1350 {Opt_data_ordered, "data=ordered"},
1351 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1352 {Opt_data_err_abort, "data_err=abort"},
1353 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1354 {Opt_offusrjquota, "usrjquota="},
1355 {Opt_usrjquota, "usrjquota=%s"},
1356 {Opt_offgrpjquota, "grpjquota="},
1357 {Opt_grpjquota, "grpjquota=%s"},
1358 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1359 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1360 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1361 {Opt_grpquota, "grpquota"},
1362 {Opt_noquota, "noquota"},
1363 {Opt_quota, "quota"},
1364 {Opt_usrquota, "usrquota"},
49da9392 1365 {Opt_prjquota, "prjquota"},
ac27a0ec 1366 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1367 {Opt_barrier, "barrier"},
1368 {Opt_nobarrier, "nobarrier"},
25ec56b5 1369 {Opt_i_version, "i_version"},
923ae0ff 1370 {Opt_dax, "dax"},
c9de560d 1371 {Opt_stripe, "stripe=%u"},
64769240 1372 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1373 {Opt_lazytime, "lazytime"},
1374 {Opt_nolazytime, "nolazytime"},
670e9875 1375 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1376 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1377 {Opt_removed, "mblk_io_submit"},
1378 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1379 {Opt_block_validity, "block_validity"},
1380 {Opt_noblock_validity, "noblock_validity"},
240799cd 1381 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1382 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1383 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1384 {Opt_auto_da_alloc, "auto_da_alloc"},
1385 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1386 {Opt_dioread_nolock, "dioread_nolock"},
1387 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1388 {Opt_discard, "discard"},
1389 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1390 {Opt_init_itable, "init_itable=%u"},
1391 {Opt_init_itable, "init_itable"},
1392 {Opt_noinit_itable, "noinit_itable"},
df981d03 1393 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1394 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1395 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1396 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1397 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1398 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1399 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1400 {Opt_err, NULL},
ac27a0ec
DK		 1401};
1402
617ba13b 1403static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1404{
617ba13b 1405 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1406 char *options = (char *) *data;
1407
1408 if (!options || strncmp(options, "sb=", 3) != 0)
1409 return 1; /* Default location */
0b8e58a1 1410
ac27a0ec 1411 options += 3;
0b8e58a1 1412 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1413 sb_block = simple_strtoul(options, &options, 0);
1414 if (*options && *options != ',') {
4776004f 1415 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1416 (char *) *data);
1417 return 1;
1418 }
1419 if (*options == ',')
1420 options++;
1421 *data = (void *) options;
0b8e58a1 1422
ac27a0ec
DK		 1423 return sb_block;
1424}
1425
b3881f74 1426#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1427static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1428 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1429
56c50f11
DM		 1430#ifdef CONFIG_QUOTA
1431static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1432{
1433 struct ext4_sb_info *sbi = EXT4_SB(sb);
1434 char *qname;
03dafb5f 1435 int ret = -1;
56c50f11
DM		 1436
1437 if (sb_any_quota_loaded(sb) &&
1438 !sbi->s_qf_names[qtype]) {
1439 ext4_msg(sb, KERN_ERR,
1440 "Cannot change journaled "
1441 "quota options when quota turned on");
57f73c2c 1442 return -1;
56c50f11 1443 }
e2b911c5 1444 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1445 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1446 "ignored when QUOTA feature is enabled");
1447 return 1;
262b4662 1448 }
56c50f11
DM		 1449 qname = match_strdup(args);
1450 if (!qname) {
1451 ext4_msg(sb, KERN_ERR,
1452 "Not enough memory for storing quotafile name");
57f73c2c 1453 return -1;
56c50f11 1454 }
03dafb5f
CG		 1455 if (sbi->s_qf_names[qtype]) {
1456 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1457 ret = 1;
1458 else
1459 ext4_msg(sb, KERN_ERR,
1460 "%s quota file already specified",
1461 QTYPE2NAME(qtype));
1462 goto errout;
56c50f11 1463 }
03dafb5f 1464 if (strchr(qname, '/')) {
56c50f11
DM		 1465 ext4_msg(sb, KERN_ERR,
1466 "quotafile must be on filesystem root");
03dafb5f 1467 goto errout;
56c50f11 1468 }
03dafb5f 1469 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1470 set_opt(sb, QUOTA);
56c50f11 1471 return 1;
03dafb5f
CG		 1472errout:
1473 kfree(qname);
1474 return ret;
56c50f11
DM		 1475}
1476
1477static int clear_qf_name(struct super_block *sb, int qtype)
1478{
1479
1480 struct ext4_sb_info *sbi = EXT4_SB(sb);
1481
1482 if (sb_any_quota_loaded(sb) &&
1483 sbi->s_qf_names[qtype]) {
1484 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1485 " when quota turned on");
57f73c2c 1486 return -1;
56c50f11 1487 }
03dafb5f 1488 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1489 sbi->s_qf_names[qtype] = NULL;
1490 return 1;
1491}
1492#endif
1493
26092bf5
TT		 1494#define MOPT_SET 0x0001
1495#define MOPT_CLEAR 0x0002
1496#define MOPT_NOSUPPORT 0x0004
1497#define MOPT_EXPLICIT 0x0008
1498#define MOPT_CLEAR_ERR 0x0010
1499#define MOPT_GTE0 0x0020
ac27a0ec 1500#ifdef CONFIG_QUOTA
26092bf5
TT		 1501#define MOPT_Q 0
1502#define MOPT_QFMT 0x0040
1503#else
1504#define MOPT_Q MOPT_NOSUPPORT
1505#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1506#endif
26092bf5 1507#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1508#define MOPT_NO_EXT2 0x0100
1509#define MOPT_NO_EXT3 0x0200
1510#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1511#define MOPT_STRING 0x0400
26092bf5
TT		 1512
1513static const struct mount_opts {
1514 int token;
1515 int mount_opt;
1516 int flags;
1517} ext4_mount_opts[] = {
1518 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1519 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1520 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1521 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1522 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1523 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1524 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1525 MOPT_EXT4_ONLY | MOPT_SET},
1526 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1527 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1528 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1529 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1530 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1531 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1532 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1533 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1534 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1535 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1536 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1537 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1538 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1539 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1540 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1541 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1542 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1543 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1544 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1545 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1546 MOPT_NO_EXT2},
8dc0aa8c 1547 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1548 MOPT_NO_EXT2},
26092bf5
TT		 1549 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1550 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1551 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1552 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1553 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1554 {Opt_commit, 0, MOPT_GTE0},
1555 {Opt_max_batch_time, 0, MOPT_GTE0},
1556 {Opt_min_batch_time, 0, MOPT_GTE0},
1557 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1558 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1559 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1560 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1561 {Opt_resuid, 0, MOPT_GTE0},
1562 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1563 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1564 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1565 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1566 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1567 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1568 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1569 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1570 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1571 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1572#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1573 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1574 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1575#else
26092bf5
TT		 1576 {Opt_acl, 0, MOPT_NOSUPPORT},
1577 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1578#endif
26092bf5
TT		 1579 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1580 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1581 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1582 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1583 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1584 MOPT_SET | MOPT_Q},
1585 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1586 MOPT_SET | MOPT_Q},
49da9392
JK		 1587 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1588 MOPT_SET | MOPT_Q},
26092bf5 1589 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1590 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1591 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1592 {Opt_usrjquota, 0, MOPT_Q},
1593 {Opt_grpjquota, 0, MOPT_Q},
1594 {Opt_offusrjquota, 0, MOPT_Q},
1595 {Opt_offgrpjquota, 0, MOPT_Q},
1596 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1597 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1598 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1599 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1600 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1601 {Opt_err, 0, 0}
1602};
1603
1604static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1605 substring_t *args, unsigned long *journal_devnum,
1606 unsigned int *journal_ioprio, int is_remount)
1607{
1608 struct ext4_sb_info *sbi = EXT4_SB(sb);
1609 const struct mount_opts *m;
08cefc7a
EB		 1610 kuid_t uid;
1611 kgid_t gid;
26092bf5
TT		 1612 int arg = 0;
1613
57f73c2c
TT		 1614#ifdef CONFIG_QUOTA
1615 if (token == Opt_usrjquota)
1616 return set_qf_name(sb, USRQUOTA, &args[0]);
1617 else if (token == Opt_grpjquota)
1618 return set_qf_name(sb, GRPQUOTA, &args[0]);
1619 else if (token == Opt_offusrjquota)
1620 return clear_qf_name(sb, USRQUOTA);
1621 else if (token == Opt_offgrpjquota)
1622 return clear_qf_name(sb, GRPQUOTA);
1623#endif
26092bf5 1624 switch (token) {
f7048605
TT		 1625 case Opt_noacl:
1626 case Opt_nouser_xattr:
1627 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1628 break;
26092bf5
TT		 1629 case Opt_sb:
1630 return 1; /* handled by get_sb_block() */
1631 case Opt_removed:
5f3633e3 1632 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1633 return 1;
26092bf5
TT		 1634 case Opt_abort:
1635 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1636 return 1;
1637 case Opt_i_version:
1638 sb->s_flags |= MS_I_VERSION;
1639 return 1;
a26f4992
TT		 1640 case Opt_lazytime:
1641 sb->s_flags |= MS_LAZYTIME;
1642 return 1;
1643 case Opt_nolazytime:
1644 sb->s_flags &= ~MS_LAZYTIME;
1645 return 1;
26092bf5
TT		 1646 }
1647
5f3633e3
JK		 1648 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1649 if (token == m->token)
1650 break;
1651
1652 if (m->token == Opt_err) {
1653 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1654 "or missing value", opt);
1655 return -1;
1656 }
1657
8dc0aa8c
TT		 1658 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1659 ext4_msg(sb, KERN_ERR,
1660 "Mount option \"%s\" incompatible with ext2", opt);
1661 return -1;
1662 }
1663 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1664 ext4_msg(sb, KERN_ERR,
1665 "Mount option \"%s\" incompatible with ext3", opt);
1666 return -1;
1667 }
1668
ad4eec61 1669 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1670 return -1;
1671 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1672 return -1;
c93cf2d7
DM		 1673 if (m->flags & MOPT_EXPLICIT) {
1674 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1675 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1676 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1677 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1678 } else
1679 return -1;
1680 }
5f3633e3
JK		 1681 if (m->flags & MOPT_CLEAR_ERR)
1682 clear_opt(sb, ERRORS_MASK);
1683 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1684 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1685 "options when quota turned on");
1686 return -1;
1687 }
1688
1689 if (m->flags & MOPT_NOSUPPORT) {
1690 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1691 } else if (token == Opt_commit) {
1692 if (arg == 0)
1693 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1694 sbi->s_commit_interval = HZ * arg;
670e9875
TT		 1695 } else if (token == Opt_debug_want_extra_isize) {
1696 sbi->s_want_extra_isize = arg;
5f3633e3 1697 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1698 sbi->s_max_batch_time = arg;
1699 } else if (token == Opt_min_batch_time) {
1700 sbi->s_min_batch_time = arg;
1701 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1702 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1703 ext4_msg(sb, KERN_ERR,
1704 "EXT4-fs: inode_readahead_blks must be "
1705 "0 or a power of 2 smaller than 2^31");
26092bf5 1706 return -1;
5f3633e3
JK		 1707 }
1708 sbi->s_inode_readahead_blks = arg;
1709 } else if (token == Opt_init_itable) {
1710 set_opt(sb, INIT_INODE_TABLE);
1711 if (!args->from)
1712 arg = EXT4_DEF_LI_WAIT_MULT;
1713 sbi->s_li_wait_mult = arg;
1714 } else if (token == Opt_max_dir_size_kb) {
1715 sbi->s_max_dir_size_kb = arg;
1716 } else if (token == Opt_stripe) {
1717 sbi->s_stripe = arg;
1718 } else if (token == Opt_resuid) {
1719 uid = make_kuid(current_user_ns(), arg);
1720 if (!uid_valid(uid)) {
1721 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1722 return -1;
1723 }
5f3633e3
JK		 1724 sbi->s_resuid = uid;
1725 } else if (token == Opt_resgid) {
1726 gid = make_kgid(current_user_ns(), arg);
1727 if (!gid_valid(gid)) {
1728 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1729 return -1;
1730 }
1731 sbi->s_resgid = gid;
1732 } else if (token == Opt_journal_dev) {
1733 if (is_remount) {
1734 ext4_msg(sb, KERN_ERR,
1735 "Cannot specify journal on remount");
1736 return -1;
1737 }
1738 *journal_devnum = arg;
ad4eec61
ES		 1739 } else if (token == Opt_journal_path) {
1740 char *journal_path;
1741 struct inode *journal_inode;
1742 struct path path;
1743 int error;
1744
1745 if (is_remount) {
1746 ext4_msg(sb, KERN_ERR,
1747 "Cannot specify journal on remount");
1748 return -1;
1749 }
1750 journal_path = match_strdup(&args[0]);
1751 if (!journal_path) {
1752 ext4_msg(sb, KERN_ERR, "error: could not dup "
1753 "journal device string");
1754 return -1;
1755 }
1756
1757 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1758 if (error) {
1759 ext4_msg(sb, KERN_ERR, "error: could not find "
1760 "journal device path: error %d", error);
1761 kfree(journal_path);
1762 return -1;
1763 }
1764
2b0143b5 1765 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1766 if (!S_ISBLK(journal_inode->i_mode)) {
1767 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1768 "is not a block device", journal_path);
1769 path_put(&path);
1770 kfree(journal_path);
1771 return -1;
1772 }
1773
1774 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1775 path_put(&path);
1776 kfree(journal_path);
5f3633e3
JK		 1777 } else if (token == Opt_journal_ioprio) {
1778 if (arg > 7) {
1779 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1780 " (must be 0-7)");
1781 return -1;
1782 }
1783 *journal_ioprio =
1784 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1785 } else if (token == Opt_test_dummy_encryption) {
1786#ifdef CONFIG_EXT4_FS_ENCRYPTION
1787 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1788 ext4_msg(sb, KERN_WARNING,
1789 "Test dummy encryption mode enabled");
1790#else
1791 ext4_msg(sb, KERN_WARNING,
1792 "Test dummy encryption mount option ignored");
1793#endif
5f3633e3
JK		 1794 } else if (m->flags & MOPT_DATAJ) {
1795 if (is_remount) {
1796 if (!sbi->s_journal)
1797 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1798 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1799 ext4_msg(sb, KERN_ERR,
26092bf5 1800 "Cannot change data mode on remount");
26092bf5 1801 return -1;
ac27a0ec 1802 }
26092bf5 1803 } else {
5f3633e3
JK		 1804 clear_opt(sb, DATA_FLAGS);
1805 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1806 }
5f3633e3
JK		 1807#ifdef CONFIG_QUOTA
1808 } else if (m->flags & MOPT_QFMT) {
1809 if (sb_any_quota_loaded(sb) &&
1810 sbi->s_jquota_fmt != m->mount_opt) {
1811 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1812 "quota options when quota turned on");
1813 return -1;
1814 }
e2b911c5 1815 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1816 ext4_msg(sb, KERN_INFO,
1817 "Quota format mount options ignored "
262b4662 1818 "when QUOTA feature is enabled");
c325a67c 1819 return 1;
262b4662 1820 }
5f3633e3 1821 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1822#endif
923ae0ff 1823 } else if (token == Opt_dax) {
ef83b6e8
DW		 1824#ifdef CONFIG_FS_DAX
1825 ext4_msg(sb, KERN_WARNING,
1826 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1827 sbi->s_mount_opt |= m->mount_opt;
1828#else
923ae0ff
RZ		 1829 ext4_msg(sb, KERN_INFO, "dax option not supported");
1830 return -1;
5f3633e3 1831#endif
7915a861
AN		 1832 } else if (token == Opt_data_err_abort) {
1833 sbi->s_mount_opt |= m->mount_opt;
1834 } else if (token == Opt_data_err_ignore) {
1835 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1836 } else {
1837 if (!args->from)
1838 arg = 1;
1839 if (m->flags & MOPT_CLEAR)
1840 arg = !arg;
1841 else if (unlikely(!(m->flags & MOPT_SET))) {
1842 ext4_msg(sb, KERN_WARNING,
1843 "buggy handling of option %s", opt);
1844 WARN_ON(1);
1845 return -1;
1846 }
1847 if (arg != 0)
1848 sbi->s_mount_opt |= m->mount_opt;
1849 else
1850 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1851 }
5f3633e3 1852 return 1;
26092bf5
TT		 1853}
1854
1855static int parse_options(char *options, struct super_block *sb,
1856 unsigned long *journal_devnum,
1857 unsigned int *journal_ioprio,
1858 int is_remount)
1859{
1860 struct ext4_sb_info *sbi = EXT4_SB(sb);
1861 char *p;
1862 substring_t args[MAX_OPT_ARGS];
1863 int token;
1864
1865 if (!options)
1866 return 1;
1867
1868 while ((p = strsep(&options, ",")) != NULL) {
1869 if (!*p)
1870 continue;
1871 /*
1872 * Initialize args struct so we know whether arg was
1873 * found; some options take optional arguments.
1874 */
caecd0af 1875 args[0].to = args[0].from = NULL;
26092bf5
TT		 1876 token = match_token(p, tokens, args);
1877 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1878 journal_ioprio, is_remount) < 0)
1879 return 0;
ac27a0ec
DK		 1880 }
1881#ifdef CONFIG_QUOTA
49da9392
JK		 1882 /*
1883 * We do the test below only for project quotas. 'usrquota' and
1884 * 'grpquota' mount options are allowed even without quota feature
1885 * to support legacy quotas in quota files.
1886 */
1887 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1888 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1889 "Cannot enable project quota enforcement.");
1890 return 0;
1891 }
1892 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1893 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1894 clear_opt(sb, USRQUOTA);
ac27a0ec 1895
482a7425 1896 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1897 clear_opt(sb, GRPQUOTA);
ac27a0ec 1898
56c50f11 1899 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1900 ext4_msg(sb, KERN_ERR, "old and new quota "
1901 "format mixing");
ac27a0ec
DK		 1902 return 0;
1903 }
1904
1905 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1906 ext4_msg(sb, KERN_ERR, "journaled quota format "
1907 "not specified");
ac27a0ec
DK		 1908 return 0;
1909 }
ac27a0ec
DK		 1910 }
1911#endif
261cb20c
JK		 1912 if (test_opt(sb, DIOREAD_NOLOCK)) {
1913 int blocksize =
1914 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1915
09cbfeaf 1916 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 1917 ext4_msg(sb, KERN_ERR, "can't mount with "
1918 "dioread_nolock if block size != PAGE_SIZE");
1919 return 0;
1920 }
1921 }
ac27a0ec
DK		 1922 return 1;
1923}
1924
2adf6da8
TT		 1925static inline void ext4_show_quota_options(struct seq_file *seq,
1926 struct super_block *sb)
1927{
1928#if defined(CONFIG_QUOTA)
1929 struct ext4_sb_info *sbi = EXT4_SB(sb);
1930
1931 if (sbi->s_jquota_fmt) {
1932 char *fmtname = "";
1933
1934 switch (sbi->s_jquota_fmt) {
1935 case QFMT_VFS_OLD:
1936 fmtname = "vfsold";
1937 break;
1938 case QFMT_VFS_V0:
1939 fmtname = "vfsv0";
1940 break;
1941 case QFMT_VFS_V1:
1942 fmtname = "vfsv1";
1943 break;
1944 }
1945 seq_printf(seq, ",jqfmt=%s", fmtname);
1946 }
1947
1948 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1949 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1950
1951 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1952 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1953#endif
1954}
1955
5a916be1
TT		 1956static const char *token2str(int token)
1957{
50df9fd5 1958 const struct match_token *t;
5a916be1
TT		 1959
1960 for (t = tokens; t->token != Opt_err; t++)
1961 if (t->token == token && !strchr(t->pattern, '='))
1962 break;
1963 return t->pattern;
1964}
1965
2adf6da8
TT		 1966/*
1967 * Show an option if
1968 * - it's set to a non-default value OR
1969 * - if the per-sb default is different from the global default
1970 */
66acdcf4
TT		 1971static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1972 int nodefs)
2adf6da8 1973{
2adf6da8
TT		 1974 struct ext4_sb_info *sbi = EXT4_SB(sb);
1975 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1976 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1977 const struct mount_opts *m;
66acdcf4 1978 char sep = nodefs ? '\n' : ',';
2adf6da8 1979
66acdcf4
TT		 1980#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1981#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1982
1983 if (sbi->s_sb_block != 1)
5a916be1
TT		 1984 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1985
1986 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1987 int want_set = m->flags & MOPT_SET;
1988 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1989 (m->flags & MOPT_CLEAR_ERR))
1990 continue;
66acdcf4 1991 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1992 continue; /* skip if same as the default */
1993 if ((want_set &&
1994 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1995 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1996 continue; /* select Opt_noFoo vs Opt_Foo */
1997 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1998 }
5a916be1 1999
08cefc7a 2000 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2001 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2002 SEQ_OPTS_PRINT("resuid=%u",
2003 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2004 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2005 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2006 SEQ_OPTS_PRINT("resgid=%u",
2007 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2008 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2009 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2010 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2011 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2012 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2013 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2014 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2015 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2016 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2017 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2018 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2019 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2020 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 2021 if (sb->s_flags & MS_I_VERSION)
5a916be1 2022 SEQ_OPTS_PUTS("i_version");
66acdcf4 2023 if (nodefs || sbi->s_stripe)
5a916be1 2024 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 2025 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2026 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2027 SEQ_OPTS_PUTS("data=journal");
2028 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2029 SEQ_OPTS_PUTS("data=ordered");
2030 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2031 SEQ_OPTS_PUTS("data=writeback");
2032 }
66acdcf4
TT		 2033 if (nodefs ||
2034 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2035 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2036 sbi->s_inode_readahead_blks);
2adf6da8 2037
66acdcf4
TT		 2038 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2039 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2040 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2041 if (nodefs || sbi->s_max_dir_size_kb)
2042 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2043 if (test_opt(sb, DATA_ERR_ABORT))
2044 SEQ_OPTS_PUTS("data_err=abort");
2adf6da8
TT		 2045
2046 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2047 return 0;
2048}
2049
66acdcf4
TT		 2050static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2051{
2052 return _ext4_show_options(seq, root->d_sb, 0);
2053}
2054
ebd173be 2055int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2056{
2057 struct super_block *sb = seq->private;
2058 int rc;
2059
2060 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
2061 rc = _ext4_show_options(seq, sb, 1);
2062 seq_puts(seq, "\n");
2063 return rc;
2064}
2065
617ba13b 2066static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2067 int read_only)
2068{
617ba13b 2069 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2070 int res = 0;
2071
617ba13b 2072 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2073 ext4_msg(sb, KERN_ERR, "revision level too high, "
2074 "forcing read-only mode");
ac27a0ec
DK		 2075 res = MS_RDONLY;
2076 }
2077 if (read_only)
281b5995 2078 goto done;
617ba13b 2079 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2080 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2081 "running e2fsck is recommended");
c8b459f4 2082 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2083 ext4_msg(sb, KERN_WARNING,
2084 "warning: mounting fs with errors, "
2085 "running e2fsck is recommended");
ed3ce80a 2086 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2087 le16_to_cpu(es->s_mnt_count) >=
2088 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2089 ext4_msg(sb, KERN_WARNING,
2090 "warning: maximal mount count reached, "
2091 "running e2fsck is recommended");
ac27a0ec
DK		 2092 else if (le32_to_cpu(es->s_checkinterval) &&
2093 (le32_to_cpu(es->s_lastcheck) +
2094 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 2095 ext4_msg(sb, KERN_WARNING,
2096 "warning: checktime reached, "
2097 "running e2fsck is recommended");
0b8e58a1 2098 if (!sbi->s_journal)
0390131b 2099 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2100 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2101 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2102 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 2103 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 2104 ext4_update_dynamic_rev(sb);
0390131b 2105 if (sbi->s_journal)
e2b911c5 2106 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2107
e2d67052 2108 ext4_commit_super(sb, 1);
281b5995 2109done:
ac27a0ec 2110 if (test_opt(sb, DEBUG))
a9df9a49 2111 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2112 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2113 sb->s_blocksize,
2114 sbi->s_groups_count,
617ba13b
MC		 2115 EXT4_BLOCKS_PER_GROUP(sb),
2116 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2117 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2118
7abc52c2 2119 cleancache_init_fs(sb);
ac27a0ec
DK		 2120 return res;
2121}
2122
117fff10
TT		 2123int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2124{
2125 struct ext4_sb_info *sbi = EXT4_SB(sb);
2126 struct flex_groups *new_groups;
2127 int size;
2128
2129 if (!sbi->s_log_groups_per_flex)
2130 return 0;
2131
2132 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2133 if (size <= sbi->s_flex_groups_allocated)
2134 return 0;
2135
2136 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2137 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2138 if (!new_groups) {
2139 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2140 size / (int) sizeof(struct flex_groups));
2141 return -ENOMEM;
2142 }
2143
2144 if (sbi->s_flex_groups) {
2145 memcpy(new_groups, sbi->s_flex_groups,
2146 (sbi->s_flex_groups_allocated *
2147 sizeof(struct flex_groups)));
b93b41d4 2148 kvfree(sbi->s_flex_groups);
117fff10
TT		 2149 }
2150 sbi->s_flex_groups = new_groups;
2151 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2152 return 0;
2153}
2154
772cb7c8
JS		 2155static int ext4_fill_flex_info(struct super_block *sb)
2156{
2157 struct ext4_sb_info *sbi = EXT4_SB(sb);
2158 struct ext4_group_desc *gdp = NULL;
772cb7c8 2159 ext4_group_t flex_group;
117fff10 2160 int i, err;
772cb7c8 2161
503358ae 2162 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2163 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2164 sbi->s_log_groups_per_flex = 0;
2165 return 1;
2166 }
2167
117fff10
TT		 2168 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2169 if (err)
9933fc0a 2170 goto failed;
772cb7c8 2171
772cb7c8 2172 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2173 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2174
2175 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2176 atomic_add(ext4_free_inodes_count(sb, gdp),
2177 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2178 atomic64_add(ext4_free_group_clusters(sb, gdp),
2179 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2180 atomic_add(ext4_used_dirs_count(sb, gdp),
2181 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2182 }
2183
2184 return 1;
2185failed:
2186 return 0;
2187}
2188
e2b911c5 2189static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2190 struct ext4_group_desc *gdp)
717d50e4 2191{
b47820ed 2192 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2193 __u16 crc = 0;
feb0ab32 2194 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2195 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2196
9aa5d32b 2197 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2198 /* Use new metadata_csum algorithm */
feb0ab32 2199 __u32 csum32;
b47820ed 2200 __u16 dummy_csum = 0;
feb0ab32 2201
feb0ab32
DW		 2202 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2203 sizeof(le_group));
b47820ed
DJ		 2204 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2205 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2206 sizeof(dummy_csum));
2207 offset += sizeof(dummy_csum);
2208 if (offset < sbi->s_desc_size)
2209 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2210 sbi->s_desc_size - offset);
feb0ab32
DW		 2211
2212 crc = csum32 & 0xFFFF;
2213 goto out;
717d50e4
AD		 2214 }
2215
feb0ab32 2216 /* old crc16 code */
e2b911c5 2217 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2218 return 0;
2219
feb0ab32
DW		 2220 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2221 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2222 crc = crc16(crc, (__u8 *)gdp, offset);
2223 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2224 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2225 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2226 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2227 crc = crc16(crc, (__u8 *)gdp + offset,
2228 le16_to_cpu(sbi->s_es->s_desc_size) -
2229 offset);
2230
2231out:
717d50e4
AD		 2232 return cpu_to_le16(crc);
2233}
2234
feb0ab32 2235int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2236 struct ext4_group_desc *gdp)
2237{
feb0ab32 2238 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2239 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2240 return 0;
2241
2242 return 1;
2243}
2244
feb0ab32
DW		 2245void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2246 struct ext4_group_desc *gdp)
2247{
2248 if (!ext4_has_group_desc_csum(sb))
2249 return;
e2b911c5 2250 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2251}
2252
ac27a0ec 2253/* Called at mount-time, super-block is locked */
bfff6873 2254static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2255 ext4_fsblk_t sb_block,
bfff6873 2256 ext4_group_t *first_not_zeroed)
ac27a0ec 2257{
617ba13b
MC		 2258 struct ext4_sb_info *sbi = EXT4_SB(sb);
2259 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2260 ext4_fsblk_t last_block;
bd81d8ee
LV		 2261 ext4_fsblk_t block_bitmap;
2262 ext4_fsblk_t inode_bitmap;
2263 ext4_fsblk_t inode_table;
ce421581 2264 int flexbg_flag = 0;
bfff6873 2265 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2266
e2b911c5 2267 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2268 flexbg_flag = 1;
2269
af5bc92d 2270 ext4_debug("Checking group descriptors");
ac27a0ec 2271
197cd65a
AM		 2272 for (i = 0; i < sbi->s_groups_count; i++) {
2273 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2274
ce421581 2275 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2276 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2277 else
2278 last_block = first_block +
617ba13b 2279 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2280
bfff6873
LC		 2281 if ((grp == sbi->s_groups_count) &&
2282 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2283 grp = i;
2284
8fadc143 2285 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2286 if (block_bitmap == sb_block) {
2287 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2288 "Block bitmap for group %u overlaps "
2289 "superblock", i);
2290 }
2b2d6d01 2291 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2292 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2293 "Block bitmap for group %u not in group "
b31e1552 2294 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2295 return 0;
2296 }
8fadc143 2297 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2298 if (inode_bitmap == sb_block) {
2299 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2300 "Inode bitmap for group %u overlaps "
2301 "superblock", i);
2302 }
2b2d6d01 2303 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2304 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2305 "Inode bitmap for group %u not in group "
b31e1552 2306 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2307 return 0;
2308 }
8fadc143 2309 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2310 if (inode_table == sb_block) {
2311 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2312 "Inode table for group %u overlaps "
2313 "superblock", i);
2314 }
bd81d8ee 2315 if (inode_table < first_block ||
2b2d6d01 2316 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2317 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2318 "Inode table for group %u not in group "
b31e1552 2319 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2320 return 0;
2321 }
955ce5f5 2322 ext4_lock_group(sb, i);
feb0ab32 2323 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2324 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2325 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2326 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2327 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2328 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2329 ext4_unlock_group(sb, i);
8a266467 2330 return 0;
7ee1ec4c 2331 }
717d50e4 2332 }
955ce5f5 2333 ext4_unlock_group(sb, i);
ce421581
JS		 2334 if (!flexbg_flag)
2335 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2336 }
bfff6873
LC		 2337 if (NULL != first_not_zeroed)
2338 *first_not_zeroed = grp;
ac27a0ec
DK		 2339 return 1;
2340}
2341
617ba13b 2342/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2343 * the superblock) which were deleted from all directories, but held open by
2344 * a process at the time of a crash. We walk the list and try to delete these
2345 * inodes at recovery time (only with a read-write filesystem).
2346 *
2347 * In order to keep the orphan inode chain consistent during traversal (in
2348 * case of crash during recovery), we link each inode into the superblock
2349 * orphan list_head and handle it the same way as an inode deletion during
2350 * normal operation (which journals the operations for us).
2351 *
2352 * We only do an iget() and an iput() on each inode, which is very safe if we
2353 * accidentally point at an in-use or already deleted inode. The worst that
2354 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2355 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2356 * e2fsck was run on this filesystem, and it must have already done the orphan
2357 * inode cleanup for us, so we can safely abort without any further action.
2358 */
2b2d6d01
TT		 2359static void ext4_orphan_cleanup(struct super_block *sb,
2360 struct ext4_super_block *es)
ac27a0ec
DK		 2361{
2362 unsigned int s_flags = sb->s_flags;
2c98eb5e 2363 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec
DK		 2364#ifdef CONFIG_QUOTA
2365 int i;
2366#endif
2367 if (!es->s_last_orphan) {
2368 jbd_debug(4, "no orphan inodes to clean up\n");
2369 return;
2370 }
2371
a8f48a95 2372 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2373 ext4_msg(sb, KERN_ERR, "write access "
2374 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2375 return;
2376 }
2377
d39195c3
AG		 2378 /* Check if feature set would not allow a r/w mount */
2379 if (!ext4_feature_set_ok(sb, 0)) {
2380 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2381 "unknown ROCOMPAT features");
2382 return;
2383 }
2384
617ba13b 2385 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2386 /* don't clear list on RO mount w/ errors */
2387 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2388 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2389 "clearing orphan list.\n");
c25f9bc6
ES		 2390 es->s_last_orphan = 0;
2391 }
ac27a0ec
DK		 2392 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2393 return;
2394 }
2395
2396 if (s_flags & MS_RDONLY) {
b31e1552 2397 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2398 sb->s_flags &= ~MS_RDONLY;
2399 }
2400#ifdef CONFIG_QUOTA
2401 /* Needed for iput() to work correctly and not trash data */
2402 sb->s_flags |= MS_ACTIVE;
2403 /* Turn on quotas so that they are updated correctly */
a2d4a646 2404 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2405 if (EXT4_SB(sb)->s_qf_names[i]) {
2406 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2407 if (ret < 0)
b31e1552
ES		 2408 ext4_msg(sb, KERN_ERR,
2409 "Cannot turn on journaled "
2410 "quota: error %d", ret);
ac27a0ec
DK		 2411 }
2412 }
2413#endif
2414
2415 while (es->s_last_orphan) {
2416 struct inode *inode;
2417
c65d5c6c
VN		 2418 /*
2419 * We may have encountered an error during cleanup; if
2420 * so, skip the rest.
2421 */
2422 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2423 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2424 es->s_last_orphan = 0;
2425 break;
2426 }
2427
97bd42b9
JB		 2428 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2429 if (IS_ERR(inode)) {
ac27a0ec
DK		 2430 es->s_last_orphan = 0;
2431 break;
2432 }
2433
617ba13b 2434 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2435 dquot_initialize(inode);
ac27a0ec 2436 if (inode->i_nlink) {
566370a2
PT		 2437 if (test_opt(sb, DEBUG))
2438 ext4_msg(sb, KERN_DEBUG,
2439 "%s: truncating inode %lu to %lld bytes",
2440 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2441 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2442 inode->i_ino, inode->i_size);
5955102c 2443 inode_lock(inode);
55f252c9 2444 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2445 ret = ext4_truncate(inode);
2446 if (ret)
2447 ext4_std_error(inode->i_sb, ret);
5955102c 2448 inode_unlock(inode);
ac27a0ec
DK		 2449 nr_truncates++;
2450 } else {
566370a2
PT		 2451 if (test_opt(sb, DEBUG))
2452 ext4_msg(sb, KERN_DEBUG,
2453 "%s: deleting unreferenced inode %lu",
2454 __func__, inode->i_ino);
ac27a0ec
DK		 2455 jbd_debug(2, "deleting unreferenced inode %lu\n",
2456 inode->i_ino);
2457 nr_orphans++;
2458 }
2459 iput(inode); /* The delete magic happens here! */
2460 }
2461
2b2d6d01 2462#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2463
2464 if (nr_orphans)
b31e1552
ES		 2465 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2466 PLURAL(nr_orphans));
ac27a0ec 2467 if (nr_truncates)
b31e1552
ES		 2468 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2469 PLURAL(nr_truncates));
ac27a0ec
DK		 2470#ifdef CONFIG_QUOTA
2471 /* Turn quotas off */
a2d4a646 2472 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2473 if (sb_dqopt(sb)->files[i])
287a8095 2474 dquot_quota_off(sb, i);
ac27a0ec
DK		 2475 }
2476#endif
2477 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2478}
0b8e58a1 2479
cd2291a4
ES		 2480/*
2481 * Maximal extent format file size.
2482 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2483 * extent format containers, within a sector_t, and within i_blocks
2484 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2485 * so that won't be a limiting factor.
2486 *
f17722f9
LC		 2487 * However there is other limiting factor. We do store extents in the form
2488 * of starting block and length, hence the resulting length of the extent
2489 * covering maximum file size must fit into on-disk format containers as
2490 * well. Given that length is always by 1 unit bigger than max unit (because
2491 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2492 *
cd2291a4
ES		 2493 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2494 */
f287a1a5 2495static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2496{
2497 loff_t res;
2498 loff_t upper_limit = MAX_LFS_FILESIZE;
2499
2500 /* small i_blocks in vfs inode? */
f287a1a5 2501 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2502 /*
90c699a9 2503 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2504 * i_block represent total blocks in 512 bytes
2505 * 32 == size of vfs inode i_blocks * 8
2506 */
2507 upper_limit = (1LL << 32) - 1;
2508
2509 /* total blocks in file system block size */
2510 upper_limit >>= (blkbits - 9);
2511 upper_limit <<= blkbits;
2512 }
2513
f17722f9
LC		 2514 /*
2515 * 32-bit extent-start container, ee_block. We lower the maxbytes
2516 * by one fs block, so ee_len can cover the extent of maximum file
2517 * size
2518 */
2519 res = (1LL << 32) - 1;
cd2291a4 2520 res <<= blkbits;
cd2291a4
ES		 2521
2522 /* Sanity check against vm- & vfs- imposed limits */
2523 if (res > upper_limit)
2524 res = upper_limit;
2525
2526 return res;
2527}
ac27a0ec 2528
ac27a0ec 2529/*
cd2291a4 2530 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2531 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2532 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2533 */
f287a1a5 2534static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2535{
617ba13b 2536 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2537 int meta_blocks;
2538 loff_t upper_limit;
0b8e58a1
AD		 2539 /* This is calculated to be the largest file size for a dense, block
2540 * mapped file such that the file's total number of 512-byte sectors,
2541 * including data and all indirect blocks, does not exceed (2^48 - 1).
2542 *
2543 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2544 * number of 512-byte sectors of the file.
0fc1b451
AK		 2545 */
2546
f287a1a5 2547 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2548 /*
90c699a9 2549 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2550 * the inode i_block field represents total file blocks in
2551 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2552 */
2553 upper_limit = (1LL << 32) - 1;
2554
2555 /* total blocks in file system block size */
2556 upper_limit >>= (bits - 9);
2557
2558 } else {
8180a562
AK		 2559 /*
2560 * We use 48 bit ext4_inode i_blocks
2561 * With EXT4_HUGE_FILE_FL set the i_blocks
2562 * represent total number of blocks in
2563 * file system block size
2564 */
0fc1b451
AK		 2565 upper_limit = (1LL << 48) - 1;
2566
0fc1b451
AK		 2567 }
2568
2569 /* indirect blocks */
2570 meta_blocks = 1;
2571 /* double indirect blocks */
2572 meta_blocks += 1 + (1LL << (bits-2));
2573 /* tripple indirect blocks */
2574 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2575
2576 upper_limit -= meta_blocks;
2577 upper_limit <<= bits;
ac27a0ec
DK		 2578
2579 res += 1LL << (bits-2);
2580 res += 1LL << (2*(bits-2));
2581 res += 1LL << (3*(bits-2));
2582 res <<= bits;
2583 if (res > upper_limit)
2584 res = upper_limit;
0fc1b451
AK		 2585
2586 if (res > MAX_LFS_FILESIZE)
2587 res = MAX_LFS_FILESIZE;
2588
ac27a0ec
DK		 2589 return res;
2590}
2591
617ba13b 2592static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2593 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2594{
617ba13b 2595 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2596 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2597 int has_super = 0;
2598
2599 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2600
e2b911c5 2601 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2602 return logical_sb_block + nr + 1;
ac27a0ec 2603 bg = sbi->s_desc_per_block * nr;
617ba13b 2604 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2605 has_super = 1;
0b8e58a1 2606
bd63f6b0
DW		 2607 /*
2608 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2609 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2610 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2611 * compensate.
2612 */
2613 if (sb->s_blocksize == 1024 && nr == 0 &&
2614 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2615 has_super++;
2616
617ba13b 2617 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2618}
2619
c9de560d
AT		 2620/**
2621 * ext4_get_stripe_size: Get the stripe size.
2622 * @sbi: In memory super block info
2623 *
2624 * If we have specified it via mount option, then
2625 * use the mount option value. If the value specified at mount time is
2626 * greater than the blocks per group use the super block value.
2627 * If the super block value is greater than blocks per group return 0.
2628 * Allocator needs it be less than blocks per group.
2629 *
2630 */
2631static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2632{
2633 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2634 unsigned long stripe_width =
2635 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2636 int ret;
c9de560d
AT		 2637
2638 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2639 ret = sbi->s_stripe;
5469d7c3 2640 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2641 ret = stripe_width;
5469d7c3 2642 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2643 ret = stride;
2644 else
2645 ret = 0;
c9de560d 2646
3eb08658
DE		 2647 /*
2648 * If the stripe width is 1, this makes no sense and
2649 * we set it to 0 to turn off stripe handling code.
2650 */
2651 if (ret <= 1)
2652 ret = 0;
c9de560d 2653
3eb08658 2654 return ret;
c9de560d 2655}
ac27a0ec 2656
a13fb1a4
ES		 2657/*
2658 * Check whether this filesystem can be mounted based on
2659 * the features present and the RDONLY/RDWR mount requested.
2660 * Returns 1 if this filesystem can be mounted as requested,
2661 * 0 if it cannot be.
2662 */
2663static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2664{
e2b911c5 2665 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2666 ext4_msg(sb, KERN_ERR,
2667 "Couldn't mount because of "
2668 "unsupported optional features (%x)",
2669 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2670 ~EXT4_FEATURE_INCOMPAT_SUPP));
2671 return 0;
2672 }
2673
2674 if (readonly)
2675 return 1;
2676
e2b911c5 2677 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2678 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2679 sb->s_flags |= MS_RDONLY;
2680 return 1;
2681 }
2682
a13fb1a4 2683 /* Check that feature set is OK for a read-write mount */
e2b911c5 2684 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2685 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2686 "unsupported optional features (%x)",
2687 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2688 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2689 return 0;
2690 }
2691 /*
2692 * Large file size enabled file system can only be mounted
2693 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2694 */
e2b911c5 2695 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2696 if (sizeof(blkcnt_t) < sizeof(u64)) {
2697 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2698 "cannot be mounted RDWR without "
2699 "CONFIG_LBDAF");
2700 return 0;
2701 }
2702 }
e2b911c5 2703 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2704 ext4_msg(sb, KERN_ERR,
2705 "Can't support bigalloc feature without "
2706 "extents feature\n");
2707 return 0;
2708 }
7c319d32
AK		 2709
2710#ifndef CONFIG_QUOTA
e2b911c5 2711 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2712 ext4_msg(sb, KERN_ERR,
2713 "Filesystem with quota feature cannot be mounted RDWR "
2714 "without CONFIG_QUOTA");
2715 return 0;
2716 }
689c958c
LX		 2717 if (ext4_has_feature_project(sb) && !readonly) {
2718 ext4_msg(sb, KERN_ERR,
2719 "Filesystem with project quota feature cannot be mounted RDWR "
2720 "without CONFIG_QUOTA");
2721 return 0;
2722 }
7c319d32 2723#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2724 return 1;
2725}
2726
66e61a9e
TT		 2727/*
2728 * This function is called once a day if we have errors logged
2729 * on the file system
2730 */
2731static void print_daily_error_info(unsigned long arg)
2732{
2733 struct super_block *sb = (struct super_block *) arg;
2734 struct ext4_sb_info *sbi;
2735 struct ext4_super_block *es;
2736
2737 sbi = EXT4_SB(sb);
2738 es = sbi->s_es;
2739
2740 if (es->s_error_count)
ae0f78de
TT		 2741 /* fsck newer than v1.41.13 is needed to clean this condition. */
2742 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2743 le32_to_cpu(es->s_error_count));
2744 if (es->s_first_error_time) {
ae0f78de 2745 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2746 sb->s_id, le32_to_cpu(es->s_first_error_time),
2747 (int) sizeof(es->s_first_error_func),
2748 es->s_first_error_func,
2749 le32_to_cpu(es->s_first_error_line));
2750 if (es->s_first_error_ino)
651e1c3b 2751 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2752 le32_to_cpu(es->s_first_error_ino));
2753 if (es->s_first_error_block)
651e1c3b 2754 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2755 le64_to_cpu(es->s_first_error_block));
651e1c3b 2756 printk(KERN_CONT "\n");
66e61a9e
TT		 2757 }
2758 if (es->s_last_error_time) {
ae0f78de 2759 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2760 sb->s_id, le32_to_cpu(es->s_last_error_time),
2761 (int) sizeof(es->s_last_error_func),
2762 es->s_last_error_func,
2763 le32_to_cpu(es->s_last_error_line));
2764 if (es->s_last_error_ino)
651e1c3b 2765 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2766 le32_to_cpu(es->s_last_error_ino));
2767 if (es->s_last_error_block)
651e1c3b 2768 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2769 le64_to_cpu(es->s_last_error_block));
651e1c3b 2770 printk(KERN_CONT "\n");
66e61a9e
TT		 2771 }
2772 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2773}
2774
bfff6873
LC		 2775/* Find next suitable group and run ext4_init_inode_table */
2776static int ext4_run_li_request(struct ext4_li_request *elr)
2777{
2778 struct ext4_group_desc *gdp = NULL;
2779 ext4_group_t group, ngroups;
2780 struct super_block *sb;
2781 unsigned long timeout = 0;
2782 int ret = 0;
2783
2784 sb = elr->lr_super;
2785 ngroups = EXT4_SB(sb)->s_groups_count;
2786
2787 for (group = elr->lr_next_group; group < ngroups; group++) {
2788 gdp = ext4_get_group_desc(sb, group, NULL);
2789 if (!gdp) {
2790 ret = 1;
2791 break;
2792 }
2793
2794 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2795 break;
2796 }
2797
7f511862 2798 if (group >= ngroups)
bfff6873
LC		 2799 ret = 1;
2800
2801 if (!ret) {
2802 timeout = jiffies;
2803 ret = ext4_init_inode_table(sb, group,
2804 elr->lr_timeout ? 0 : 1);
2805 if (elr->lr_timeout == 0) {
51ce6511
LC		 2806 timeout = (jiffies - timeout) *
2807 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2808 elr->lr_timeout = timeout;
2809 }
2810 elr->lr_next_sched = jiffies + elr->lr_timeout;
2811 elr->lr_next_group = group + 1;
2812 }
bfff6873
LC		 2813 return ret;
2814}
2815
2816/*
2817 * Remove lr_request from the list_request and free the
4ed5c033 2818 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2819 */
2820static void ext4_remove_li_request(struct ext4_li_request *elr)
2821{
2822 struct ext4_sb_info *sbi;
2823
2824 if (!elr)
2825 return;
2826
2827 sbi = elr->lr_sbi;
2828
2829 list_del(&elr->lr_request);
2830 sbi->s_li_request = NULL;
2831 kfree(elr);
2832}
2833
2834static void ext4_unregister_li_request(struct super_block *sb)
2835{
1bb933fb
LC		 2836 mutex_lock(&ext4_li_mtx);
2837 if (!ext4_li_info) {
2838 mutex_unlock(&ext4_li_mtx);
bfff6873 2839 return;
1bb933fb 2840 }
bfff6873
LC		 2841
2842 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2843 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2844 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2845 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2846}
2847
8f1f7453
ES		 2848static struct task_struct *ext4_lazyinit_task;
2849
bfff6873
LC		 2850/*
2851 * This is the function where ext4lazyinit thread lives. It walks
2852 * through the request list searching for next scheduled filesystem.
2853 * When such a fs is found, run the lazy initialization request
2854 * (ext4_rn_li_request) and keep track of the time spend in this
2855 * function. Based on that time we compute next schedule time of
2856 * the request. When walking through the list is complete, compute
2857 * next waking time and put itself into sleep.
2858 */
2859static int ext4_lazyinit_thread(void *arg)
2860{
2861 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2862 struct list_head *pos, *n;
2863 struct ext4_li_request *elr;
4ed5c033 2864 unsigned long next_wakeup, cur;
bfff6873
LC		 2865
2866 BUG_ON(NULL == eli);
2867
bfff6873
LC		 2868cont_thread:
2869 while (true) {
2870 next_wakeup = MAX_JIFFY_OFFSET;
2871
2872 mutex_lock(&eli->li_list_mtx);
2873 if (list_empty(&eli->li_request_list)) {
2874 mutex_unlock(&eli->li_list_mtx);
2875 goto exit_thread;
2876 }
bfff6873 2877 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 2878 int err = 0;
2879 int progress = 0;
bfff6873
LC		 2880 elr = list_entry(pos, struct ext4_li_request,
2881 lr_request);
2882
e22834f0
DM		 2883 if (time_before(jiffies, elr->lr_next_sched)) {
2884 if (time_before(elr->lr_next_sched, next_wakeup))
2885 next_wakeup = elr->lr_next_sched;
2886 continue;
2887 }
2888 if (down_read_trylock(&elr->lr_super->s_umount)) {
2889 if (sb_start_write_trylock(elr->lr_super)) {
2890 progress = 1;
2891 /*
2892 * We hold sb->s_umount, sb can not
2893 * be removed from the list, it is
2894 * now safe to drop li_list_mtx
2895 */
2896 mutex_unlock(&eli->li_list_mtx);
2897 err = ext4_run_li_request(elr);
2898 sb_end_write(elr->lr_super);
2899 mutex_lock(&eli->li_list_mtx);
2900 n = pos->next;
b2c78cd0 2901 }
e22834f0
DM		 2902 up_read((&elr->lr_super->s_umount));
2903 }
2904 /* error, remove the lazy_init job */
2905 if (err) {
2906 ext4_remove_li_request(elr);
2907 continue;
2908 }
2909 if (!progress) {
2910 elr->lr_next_sched = jiffies +
2911 (prandom_u32()
2912 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 2913 }
bfff6873
LC		 2914 if (time_before(elr->lr_next_sched, next_wakeup))
2915 next_wakeup = elr->lr_next_sched;
2916 }
2917 mutex_unlock(&eli->li_list_mtx);
2918
a0acae0e 2919 try_to_freeze();
bfff6873 2920
4ed5c033
LC		 2921 cur = jiffies;
2922 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2923 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2924 cond_resched();
2925 continue;
2926 }
2927
4ed5c033
LC		 2928 schedule_timeout_interruptible(next_wakeup - cur);
2929
8f1f7453
ES		 2930 if (kthread_should_stop()) {
2931 ext4_clear_request_list();
2932 goto exit_thread;
2933 }
bfff6873
LC		 2934 }
2935
2936exit_thread:
2937 /*
2938 * It looks like the request list is empty, but we need
2939 * to check it under the li_list_mtx lock, to prevent any
2940 * additions into it, and of course we should lock ext4_li_mtx
2941 * to atomically free the list and ext4_li_info, because at
2942 * this point another ext4 filesystem could be registering
2943 * new one.
2944 */
2945 mutex_lock(&ext4_li_mtx);
2946 mutex_lock(&eli->li_list_mtx);
2947 if (!list_empty(&eli->li_request_list)) {
2948 mutex_unlock(&eli->li_list_mtx);
2949 mutex_unlock(&ext4_li_mtx);
2950 goto cont_thread;
2951 }
2952 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2953 kfree(ext4_li_info);
2954 ext4_li_info = NULL;
2955 mutex_unlock(&ext4_li_mtx);
2956
2957 return 0;
2958}
2959
2960static void ext4_clear_request_list(void)
2961{
2962 struct list_head *pos, *n;
2963 struct ext4_li_request *elr;
2964
2965 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2966 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2967 elr = list_entry(pos, struct ext4_li_request,
2968 lr_request);
2969 ext4_remove_li_request(elr);
2970 }
2971 mutex_unlock(&ext4_li_info->li_list_mtx);
2972}
2973
2974static int ext4_run_lazyinit_thread(void)
2975{
8f1f7453
ES		 2976 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2977 ext4_li_info, "ext4lazyinit");
2978 if (IS_ERR(ext4_lazyinit_task)) {
2979 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2980 ext4_clear_request_list();
bfff6873
LC		 2981 kfree(ext4_li_info);
2982 ext4_li_info = NULL;
92b97816 2983 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2984 "initialization thread\n",
2985 err);
2986 return err;
2987 }
2988 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2989 return 0;
2990}
2991
2992/*
2993 * Check whether it make sense to run itable init. thread or not.
2994 * If there is at least one uninitialized inode table, return
2995 * corresponding group number, else the loop goes through all
2996 * groups and return total number of groups.
2997 */
2998static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2999{
3000 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3001 struct ext4_group_desc *gdp = NULL;
3002
3003 for (group = 0; group < ngroups; group++) {
3004 gdp = ext4_get_group_desc(sb, group, NULL);
3005 if (!gdp)
3006 continue;
3007
3008 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3009 break;
3010 }
3011
3012 return group;
3013}
3014
3015static int ext4_li_info_new(void)
3016{
3017 struct ext4_lazy_init *eli = NULL;
3018
3019 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3020 if (!eli)
3021 return -ENOMEM;
3022
bfff6873
LC		 3023 INIT_LIST_HEAD(&eli->li_request_list);
3024 mutex_init(&eli->li_list_mtx);
3025
bfff6873
LC		 3026 eli->li_state |= EXT4_LAZYINIT_QUIT;
3027
3028 ext4_li_info = eli;
3029
3030 return 0;
3031}
3032
3033static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3034 ext4_group_t start)
3035{
3036 struct ext4_sb_info *sbi = EXT4_SB(sb);
3037 struct ext4_li_request *elr;
bfff6873
LC		 3038
3039 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3040 if (!elr)
3041 return NULL;
3042
3043 elr->lr_super = sb;
3044 elr->lr_sbi = sbi;
3045 elr->lr_next_group = start;
3046
3047 /*
3048 * Randomize first schedule time of the request to
3049 * spread the inode table initialization requests
3050 * better.
3051 */
dd1f723b
TT		 3052 elr->lr_next_sched = jiffies + (prandom_u32() %
3053 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3054 return elr;
3055}
3056
7f511862
TT		 3057int ext4_register_li_request(struct super_block *sb,
3058 ext4_group_t first_not_zeroed)
bfff6873
LC		 3059{
3060 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3061 struct ext4_li_request *elr = NULL;
bfff6873 3062 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3063 int ret = 0;
bfff6873 3064
7f511862 3065 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3066 if (sbi->s_li_request != NULL) {
3067 /*
3068 * Reset timeout so it can be computed again, because
3069 * s_li_wait_mult might have changed.
3070 */
3071 sbi->s_li_request->lr_timeout = 0;
7f511862 3072 goto out;
51ce6511 3073 }
bfff6873
LC		 3074
3075 if (first_not_zeroed == ngroups ||
3076 (sb->s_flags & MS_RDONLY) ||
55ff3840 3077 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3078 goto out;
bfff6873
LC		 3079
3080 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3081 if (!elr) {
3082 ret = -ENOMEM;
3083 goto out;
3084 }
bfff6873
LC		 3085
3086 if (NULL == ext4_li_info) {
3087 ret = ext4_li_info_new();
3088 if (ret)
3089 goto out;
3090 }
3091
3092 mutex_lock(&ext4_li_info->li_list_mtx);
3093 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3094 mutex_unlock(&ext4_li_info->li_list_mtx);
3095
3096 sbi->s_li_request = elr;
46e4690b
TM		 3097 /*
3098 * set elr to NULL here since it has been inserted to
3099 * the request_list and the removal and free of it is
3100 * handled by ext4_clear_request_list from now on.
3101 */
3102 elr = NULL;
bfff6873
LC		 3103
3104 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3105 ret = ext4_run_lazyinit_thread();
3106 if (ret)
3107 goto out;
3108 }
bfff6873 3109out:
beed5ecb
NK		 3110 mutex_unlock(&ext4_li_mtx);
3111 if (ret)
bfff6873 3112 kfree(elr);
bfff6873
LC		 3113 return ret;
3114}
3115
3116/*
3117 * We do not need to lock anything since this is called on
3118 * module unload.
3119 */
3120static void ext4_destroy_lazyinit_thread(void)
3121{
3122 /*
3123 * If thread exited earlier
3124 * there's nothing to be done.
3125 */
8f1f7453 3126 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3127 return;
3128
8f1f7453 3129 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3130}
3131
25ed6e8a
DW		 3132static int set_journal_csum_feature_set(struct super_block *sb)
3133{
3134 int ret = 1;
3135 int compat, incompat;
3136 struct ext4_sb_info *sbi = EXT4_SB(sb);
3137
9aa5d32b 3138 if (ext4_has_metadata_csum(sb)) {
db9ee220 3139 /* journal checksum v3 */
25ed6e8a 3140 compat = 0;
db9ee220 3141 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3142 } else {
3143 /* journal checksum v1 */
3144 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3145 incompat = 0;
3146 }
3147
feb8c6d3
DW		 3148 jbd2_journal_clear_features(sbi->s_journal,
3149 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3150 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3151 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3152 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3153 ret = jbd2_journal_set_features(sbi->s_journal,
3154 compat, 0,
3155 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3156 incompat);
3157 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3158 ret = jbd2_journal_set_features(sbi->s_journal,
3159 compat, 0,
3160 incompat);
3161 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3162 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3163 } else {
feb8c6d3
DW		 3164 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3165 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3166 }
3167
3168 return ret;
3169}
3170
952fc18e
TT		 3171/*
3172 * Note: calculating the overhead so we can be compatible with
3173 * historical BSD practice is quite difficult in the face of
3174 * clusters/bigalloc. This is because multiple metadata blocks from
3175 * different block group can end up in the same allocation cluster.
3176 * Calculating the exact overhead in the face of clustered allocation
3177 * requires either O(all block bitmaps) in memory or O(number of block
3178 * groups**2) in time. We will still calculate the superblock for
3179 * older file systems --- and if we come across with a bigalloc file
3180 * system with zero in s_overhead_clusters the estimate will be close to
3181 * correct especially for very large cluster sizes --- but for newer
3182 * file systems, it's better to calculate this figure once at mkfs
3183 * time, and store it in the superblock. If the superblock value is
3184 * present (even for non-bigalloc file systems), we will use it.
3185 */
3186static int count_overhead(struct super_block *sb, ext4_group_t grp,
3187 char *buf)
3188{
3189 struct ext4_sb_info *sbi = EXT4_SB(sb);
3190 struct ext4_group_desc *gdp;
3191 ext4_fsblk_t first_block, last_block, b;
3192 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3193 int s, j, count = 0;
3194
e2b911c5 3195 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3196 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3197 sbi->s_itb_per_group + 2);
3198
952fc18e
TT		 3199 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3200 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3201 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3202 for (i = 0; i < ngroups; i++) {
3203 gdp = ext4_get_group_desc(sb, i, NULL);
3204 b = ext4_block_bitmap(sb, gdp);
3205 if (b >= first_block && b <= last_block) {
3206 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3207 count++;
3208 }
3209 b = ext4_inode_bitmap(sb, gdp);
3210 if (b >= first_block && b <= last_block) {
3211 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3212 count++;
3213 }
3214 b = ext4_inode_table(sb, gdp);
3215 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3216 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3217 int c = EXT4_B2C(sbi, b - first_block);
3218 ext4_set_bit(c, buf);
3219 count++;
3220 }
3221 if (i != grp)
3222 continue;
3223 s = 0;
3224 if (ext4_bg_has_super(sb, grp)) {
3225 ext4_set_bit(s++, buf);
3226 count++;
3227 }
c48ae41b
TT		 3228 j = ext4_bg_num_gdb(sb, grp);
3229 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3230 ext4_error(sb, "Invalid number of block group "
3231 "descriptor blocks: %d", j);
3232 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3233 }
c48ae41b
TT		 3234 count += j;
3235 for (; j > 0; j--)
3236 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3237 }
3238 if (!count)
3239 return 0;
3240 return EXT4_CLUSTERS_PER_GROUP(sb) -
3241 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3242}
3243
3244/*
3245 * Compute the overhead and stash it in sbi->s_overhead
3246 */
3247int ext4_calculate_overhead(struct super_block *sb)
3248{
3249 struct ext4_sb_info *sbi = EXT4_SB(sb);
3250 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3251 struct inode *j_inode;
3252 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3253 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3254 ext4_fsblk_t overhead = 0;
4fdb5543 3255 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3256
952fc18e
TT		 3257 if (!buf)
3258 return -ENOMEM;
3259
3260 /*
3261 * Compute the overhead (FS structures). This is constant
3262 * for a given filesystem unless the number of block groups
3263 * changes so we cache the previous value until it does.
3264 */
3265
3266 /*
3267 * All of the blocks before first_data_block are overhead
3268 */
3269 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3270
3271 /*
3272 * Add the overhead found in each block group
3273 */
3274 for (i = 0; i < ngroups; i++) {
3275 int blks;
3276
3277 blks = count_overhead(sb, i, buf);
3278 overhead += blks;
3279 if (blks)
3280 memset(buf, 0, PAGE_SIZE);
3281 cond_resched();
3282 }
3c816ded
EW		 3283
3284 /*
3285 * Add the internal journal blocks whether the journal has been
3286 * loaded or not
3287 */
b003b524 3288 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3289 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3290 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3291 j_inode = ext4_get_journal_inode(sb, j_inum);
3292 if (j_inode) {
3293 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3294 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3295 iput(j_inode);
3296 } else {
3297 ext4_msg(sb, KERN_ERR, "can't get journal size");
3298 }
3299 }
952fc18e
TT		 3300 sbi->s_overhead = overhead;
3301 smp_wmb();
3302 free_page((unsigned long) buf);
3303 return 0;
3304}
3305
b5799018 3306static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3307{
3308 ext4_fsblk_t resv_clusters;
b5799018 3309 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3310
30fac0f7
JK		 3311 /*
3312 * There's no need to reserve anything when we aren't using extents.
3313 * The space estimates are exact, there are no unwritten extents,
3314 * hole punching doesn't need new metadata... This is needed especially
3315 * to keep ext2/3 backward compatibility.
3316 */
e2b911c5 3317 if (!ext4_has_feature_extents(sb))
b5799018 3318 return;
27dd4385
LC		 3319 /*
3320 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3321 * This should cover the situations where we can not afford to run
3322 * out of space like for example punch hole, or converting
556615dc 3323 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3324 * allocation would require 1, or 2 blocks, higher numbers are
3325 * very rare.
3326 */
b5799018
TT		 3327 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3328 sbi->s_cluster_bits);
27dd4385
LC		 3329
3330 do_div(resv_clusters, 50);
3331 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3332
b5799018 3333 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3334}
3335
2b2d6d01 3336static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3337{
d4c402d9 3338 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3339 struct buffer_head *bh;
617ba13b 3340 struct ext4_super_block *es = NULL;
5aee0f8a 3341 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3342 ext4_fsblk_t block;
3343 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3344 ext4_fsblk_t logical_sb_block;
ac27a0ec 3345 unsigned long offset = 0;
ac27a0ec
DK		 3346 unsigned long journal_devnum = 0;
3347 unsigned long def_mount_opts;
3348 struct inode *root;
0390131b 3349 const char *descr;
dcc7dae3 3350 int ret = -ENOMEM;
281b5995 3351 int blocksize, clustersize;
4ec11028
TT		 3352 unsigned int db_count;
3353 unsigned int i;
281b5995 3354 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3355 __u64 blocks_count;
07aa2ea1 3356 int err = 0;
b3881f74 3357 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3358 ext4_group_t first_not_zeroed;
ac27a0ec 3359
5aee0f8a
TT		 3360 if ((data && !orig_data) || !sbi)
3361 goto out_free_base;
705895b6
PE		 3362
3363 sbi->s_blockgroup_lock =
3364 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3365 if (!sbi->s_blockgroup_lock)
3366 goto out_free_base;
3367
ac27a0ec 3368 sb->s_fs_info = sbi;
2c0544b2 3369 sbi->s_sb = sb;
240799cd 3370 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3371 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3372 if (sb->s_bdev->bd_part)
3373 sbi->s_sectors_written_start =
3374 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3375
9f6200bb 3376 /* Cleanup superblock name */
ec3904dc 3377 strreplace(sb->s_id, '/', '!');
9f6200bb 3378
07aa2ea1 3379 /* -EINVAL is default */
dcc7dae3 3380 ret = -EINVAL;
617ba13b 3381 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3382 if (!blocksize) {
b31e1552 3383 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3384 goto out_fail;
3385 }
3386
3387 /*
617ba13b 3388 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3389 * block sizes. We need to calculate the offset from buffer start.
3390 */
617ba13b 3391 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3392 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3393 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3394 } else {
70bbb3e0 3395 logical_sb_block = sb_block;
ac27a0ec
DK		 3396 }
3397
a8ac900b 3398 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3399 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3400 goto out_fail;
3401 }
3402 /*
3403 * Note: s_es must be initialized as soon as possible because
617ba13b 3404 * some ext4 macro-instructions depend on its value
ac27a0ec 3405 */
2716b802 3406 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3407 sbi->s_es = es;
3408 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3409 if (sb->s_magic != EXT4_SUPER_MAGIC)
3410 goto cantfind_ext4;
afc32f7e 3411 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3412
feb0ab32 3413 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3414 if (ext4_has_feature_metadata_csum(sb) &&
3415 ext4_has_feature_gdt_csum(sb))
363307e6 3416 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3417 "redundant flags; please run fsck.");
3418
d25425f8
DW		 3419 /* Check for a known checksum algorithm */
3420 if (!ext4_verify_csum_type(sb, es)) {
3421 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3422 "unknown checksum algorithm.");
3423 silent = 1;
3424 goto cantfind_ext4;
3425 }
3426
0441984a 3427 /* Load the checksum driver */
e2b911c5 3428 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3429 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3430 if (IS_ERR(sbi->s_chksum_driver)) {
3431 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3432 ret = PTR_ERR(sbi->s_chksum_driver);
3433 sbi->s_chksum_driver = NULL;
3434 goto failed_mount;
3435 }
3436 }
3437
a9c47317
DW		 3438 /* Check superblock checksum */
3439 if (!ext4_superblock_csum_verify(sb, es)) {
3440 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3441 "invalid superblock checksum. Run e2fsck?");
3442 silent = 1;
6a797d27 3443 ret = -EFSBADCRC;
a9c47317
DW		 3444 goto cantfind_ext4;
3445 }
3446
3447 /* Precompute checksum seed for all metadata */
e2b911c5 3448 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3449 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3450 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3451 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3452 sizeof(es->s_uuid));
3453
ac27a0ec
DK		 3454 /* Set defaults before we parse the mount options */
3455 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3456 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3457 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3458 set_opt(sb, DEBUG);
87f26807 3459 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3460 set_opt(sb, GRPID);
617ba13b 3461 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3462 set_opt(sb, NO_UID32);
ea663336 3463 /* xattr user namespace & acls are now defaulted on */
ea663336 3464 set_opt(sb, XATTR_USER);
03010a33 3465#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3466 set_opt(sb, POSIX_ACL);
2e7842b8 3467#endif
98c1a759
DW		 3468 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3469 if (ext4_has_metadata_csum(sb))
3470 set_opt(sb, JOURNAL_CHECKSUM);
3471
617ba13b 3472 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3473 set_opt(sb, JOURNAL_DATA);
617ba13b 3474 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3475 set_opt(sb, ORDERED_DATA);
617ba13b 3476 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3477 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3478
3479 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3480 set_opt(sb, ERRORS_PANIC);
bb4f397a 3481 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3482 set_opt(sb, ERRORS_CONT);
bb4f397a 3483 else
fd8c37ec 3484 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3485 /* block_validity enabled by default; disable with noblock_validity */
3486 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3487 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3488 set_opt(sb, DISCARD);
ac27a0ec 3489
08cefc7a
EB		 3490 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3491 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3492 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3493 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3494 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3495
8b67f04a 3496 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3497 set_opt(sb, BARRIER);
ac27a0ec 3498
dd919b98
AK		 3499 /*
3500 * enable delayed allocation by default
3501 * Use -o nodelalloc to turn it off
3502 */
bc0b75f7 3503 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3504 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3505 set_opt(sb, DELALLOC);
dd919b98 3506
51ce6511
LC		 3507 /*
3508 * set default s_li_wait_mult for lazyinit, for the case there is
3509 * no mount option specified.
3510 */
3511 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3512
5aee0f8a
TT		 3513 if (sbi->s_es->s_mount_opts[0]) {
3514 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3515 sizeof(sbi->s_es->s_mount_opts),
3516 GFP_KERNEL);
3517 if (!s_mount_opts)
3518 goto failed_mount;
3519 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3520 &journal_ioprio, 0)) {
3521 ext4_msg(sb, KERN_WARNING,
3522 "failed to parse options in superblock: %s",
3523 s_mount_opts);
3524 }
3525 kfree(s_mount_opts);
8b67f04a 3526 }
5a916be1 3527 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3528 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3529 &journal_ioprio, 0))
ac27a0ec
DK		 3530 goto failed_mount;
3531
56889787
TT		 3532 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3533 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3534 "with data=journal disables delayed "
3535 "allocation and O_DIRECT support!\n");
3536 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3537 ext4_msg(sb, KERN_ERR, "can't mount with "
3538 "both data=journal and delalloc");
3539 goto failed_mount;
3540 }
3541 if (test_opt(sb, DIOREAD_NOLOCK)) {
3542 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3543 "both data=journal and dioread_nolock");
56889787
TT		 3544 goto failed_mount;
3545 }
923ae0ff
RZ		 3546 if (test_opt(sb, DAX)) {
3547 ext4_msg(sb, KERN_ERR, "can't mount with "
3548 "both data=journal and dax");
3549 goto failed_mount;
3550 }
73b92a2a
SK		 3551 if (ext4_has_feature_encrypt(sb)) {
3552 ext4_msg(sb, KERN_WARNING,
3553 "encrypted files will use data=ordered "
3554 "instead of data journaling mode");
3555 }
56889787
TT		 3556 if (test_opt(sb, DELALLOC))
3557 clear_opt(sb, DELALLOC);
001e4a87
TH		 3558 } else {
3559 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3560 }
3561
ac27a0ec 3562 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3563 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3564
617ba13b 3565 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3566 (ext4_has_compat_features(sb) ||
3567 ext4_has_ro_compat_features(sb) ||
3568 ext4_has_incompat_features(sb)))
b31e1552
ES		 3569 ext4_msg(sb, KERN_WARNING,
3570 "feature flags set on rev 0 fs, "
3571 "running e2fsck is recommended");
469108ff 3572
ed3654eb
TT		 3573 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3574 set_opt2(sb, HURD_COMPAT);
e2b911c5 3575 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3576 ext4_msg(sb, KERN_ERR,
3577 "The Hurd can't support 64-bit file systems");
3578 goto failed_mount;
3579 }
3580 }
3581
2035e776
TT		 3582 if (IS_EXT2_SB(sb)) {
3583 if (ext2_feature_set_ok(sb))
3584 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3585 "using the ext4 subsystem");
3586 else {
3587 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3588 "to feature incompatibilities");
3589 goto failed_mount;
3590 }
3591 }
3592
3593 if (IS_EXT3_SB(sb)) {
3594 if (ext3_feature_set_ok(sb))
3595 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3596 "using the ext4 subsystem");
3597 else {
3598 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3599 "to feature incompatibilities");
3600 goto failed_mount;
3601 }
3602 }
3603
ac27a0ec
DK		 3604 /*
3605 * Check feature flags regardless of the revision level, since we
3606 * previously didn't change the revision level when setting the flags,
3607 * so there is a chance incompat flags are set on a rev 0 filesystem.
3608 */
a13fb1a4 3609 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3610 goto failed_mount;
a13fb1a4 3611
261cb20c 3612 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3613 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3614 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3615 ext4_msg(sb, KERN_ERR,
8cdf3372
TT		 3616 "Unsupported filesystem blocksize %d (%d log_block_size)",
3617 blocksize, le32_to_cpu(es->s_log_block_size));
3618 goto failed_mount;
3619 }
3620 if (le32_to_cpu(es->s_log_block_size) >
3621 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3622 ext4_msg(sb, KERN_ERR,
3623 "Invalid log block size: %u",
3624 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3625 goto failed_mount;
3626 }
3627
5b9554dc
TT		 3628 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3629 ext4_msg(sb, KERN_ERR,
3630 "Number of reserved GDT blocks insanely large: %d",
3631 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3632 goto failed_mount;
3633 }
3634
923ae0ff 3635 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
87eefeb4
TK		 3636 err = bdev_dax_supported(sb, blocksize);
3637 if (err)
923ae0ff 3638 goto failed_mount;
923ae0ff
RZ		 3639 }
3640
e2b911c5 3641 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3642 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3643 es->s_encryption_level);
3644 goto failed_mount;
3645 }
3646
ac27a0ec 3647 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3648 /* Validate the filesystem blocksize */
3649 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3650 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3651 blocksize);
ac27a0ec
DK		 3652 goto failed_mount;
3653 }
3654
2b2d6d01 3655 brelse(bh);
70bbb3e0
AM		 3656 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3657 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3658 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3659 if (!bh) {
b31e1552
ES		 3660 ext4_msg(sb, KERN_ERR,
3661 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3662 goto failed_mount;
3663 }
2716b802 3664 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3665 sbi->s_es = es;
617ba13b 3666 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3667 ext4_msg(sb, KERN_ERR,
3668 "Magic mismatch, very weird!");
ac27a0ec
DK		 3669 goto failed_mount;
3670 }
3671 }
3672
e2b911c5 3673 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3674 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3675 has_huge_files);
3676 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3677
617ba13b
MC		 3678 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3679 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3680 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3681 } else {
3682 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3683 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3684 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3685 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3686 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3687 ext4_msg(sb, KERN_ERR,
3688 "unsupported inode size: %d",
2b2d6d01 3689 sbi->s_inode_size);
ac27a0ec
DK		 3690 goto failed_mount;
3691 }
ef7f3835
KS		 3692 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3693 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3694 }
0b8e58a1 3695
0d1ee42f 3696 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3697 if (ext4_has_feature_64bit(sb)) {
8fadc143 3698 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3699 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3700 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3701 ext4_msg(sb, KERN_ERR,
3702 "unsupported descriptor size %lu",
0d1ee42f
AR		 3703 sbi->s_desc_size);
3704 goto failed_mount;
3705 }
3706 } else
3707 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3708
ac27a0ec 3709 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3710 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3711
617ba13b 3712 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3713 if (sbi->s_inodes_per_block == 0)
617ba13b 3714 goto cantfind_ext4;
cd6bb35b
TT		 3715 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3716 sbi->s_inodes_per_group > blocksize * 8) {
3717 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3718 sbi->s_blocks_per_group);
3719 goto failed_mount;
3720 }
ac27a0ec
DK		 3721 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3722 sbi->s_inodes_per_block;
0d1ee42f 3723 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3724 sbi->s_sbh = bh;
3725 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3726 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3727 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3728
2b2d6d01 3729 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3730 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3731 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3732 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3733 i = le32_to_cpu(es->s_flags);
3734 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3735 sbi->s_hash_unsigned = 3;
3736 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3737#ifdef __CHAR_UNSIGNED__
23301410
TT		 3738 if (!(sb->s_flags & MS_RDONLY))
3739 es->s_flags |=
3740 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3741 sbi->s_hash_unsigned = 3;
f99b2589 3742#else
23301410
TT		 3743 if (!(sb->s_flags & MS_RDONLY))
3744 es->s_flags |=
3745 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3746#endif
23301410 3747 }
f99b2589 3748 }
ac27a0ec 3749
281b5995
TT		 3750 /* Handle clustersize */
3751 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3752 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3753 if (has_bigalloc) {
3754 if (clustersize < blocksize) {
3755 ext4_msg(sb, KERN_ERR,
3756 "cluster size (%d) smaller than "
3757 "block size (%d)", clustersize, blocksize);
3758 goto failed_mount;
3759 }
8cdf3372
TT		 3760 if (le32_to_cpu(es->s_log_cluster_size) >
3761 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3762 ext4_msg(sb, KERN_ERR,
3763 "Invalid log cluster size: %u",
3764 le32_to_cpu(es->s_log_cluster_size));
3765 goto failed_mount;
3766 }
281b5995
TT		 3767 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3768 le32_to_cpu(es->s_log_block_size);
3769 sbi->s_clusters_per_group =
3770 le32_to_cpu(es->s_clusters_per_group);
3771 if (sbi->s_clusters_per_group > blocksize * 8) {
3772 ext4_msg(sb, KERN_ERR,
3773 "#clusters per group too big: %lu",
3774 sbi->s_clusters_per_group);
3775 goto failed_mount;
3776 }
3777 if (sbi->s_blocks_per_group !=
3778 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3779 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3780 "clusters per group (%lu) inconsistent",
3781 sbi->s_blocks_per_group,
3782 sbi->s_clusters_per_group);
3783 goto failed_mount;
3784 }
3785 } else {
3786 if (clustersize != blocksize) {
3787 ext4_warning(sb, "fragment/cluster size (%d) != "
3788 "block size (%d)", clustersize,
3789 blocksize);
3790 clustersize = blocksize;
3791 }
3792 if (sbi->s_blocks_per_group > blocksize * 8) {
3793 ext4_msg(sb, KERN_ERR,
3794 "#blocks per group too big: %lu",
3795 sbi->s_blocks_per_group);
3796 goto failed_mount;
3797 }
3798 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3799 sbi->s_cluster_bits = 0;
ac27a0ec 3800 }
281b5995
TT		 3801 sbi->s_cluster_ratio = clustersize / blocksize;
3802
960fd856
TT		 3803 /* Do we have standard group size of clustersize * 8 blocks ? */
3804 if (sbi->s_blocks_per_group == clustersize << 3)
3805 set_opt2(sb, STD_GROUP_SIZE);
3806
bf43d84b
ES		 3807 /*
3808 * Test whether we have more sectors than will fit in sector_t,
3809 * and whether the max offset is addressable by the page cache.
3810 */
5a9ae68a 3811 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3812 ext4_blocks_count(es));
5a9ae68a 3813 if (err) {
b31e1552 3814 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3815 " too large to mount safely on this system");
ac27a0ec 3816 if (sizeof(sector_t) < 8)
90c699a9 3817 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3818 goto failed_mount;
3819 }
3820
617ba13b
MC		 3821 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3822 goto cantfind_ext4;
e7c95593 3823
0f2ddca6
FTN		 3824 /* check blocks count against device size */
3825 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3826 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3827 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3828 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3829 ext4_blocks_count(es), blocks_count);
3830 goto failed_mount;
3831 }
3832
0b8e58a1
AD		 3833 /*
3834 * It makes no sense for the first data block to be beyond the end
3835 * of the filesystem.
3836 */
3837 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3838 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3839 "block %u is beyond end of filesystem (%llu)",
3840 le32_to_cpu(es->s_first_data_block),
3841 ext4_blocks_count(es));
e7c95593
ES		 3842 goto failed_mount;
3843 }
bd81d8ee
LV		 3844 blocks_count = (ext4_blocks_count(es) -
3845 le32_to_cpu(es->s_first_data_block) +
3846 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3847 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3848 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3849 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3850 "(block count %llu, first data block %u, "
b31e1552 3851 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3852 ext4_blocks_count(es),
3853 le32_to_cpu(es->s_first_data_block),
3854 EXT4_BLOCKS_PER_GROUP(sb));
3855 goto failed_mount;
3856 }
bd81d8ee 3857 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3858 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3859 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3860 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3861 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 3862 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 3863 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 3864 ext4_msg(sb, KERN_WARNING,
3865 "first meta block group too large: %u "
3866 "(group descriptor block count %u)",
3867 le32_to_cpu(es->s_first_meta_bg), db_count);
3868 goto failed_mount;
3869 }
3870 }
f18a5f21
TT		 3871 sbi->s_group_desc = ext4_kvmalloc(db_count *
3872 sizeof(struct buffer_head *),
3873 GFP_KERNEL);
ac27a0ec 3874 if (sbi->s_group_desc == NULL) {
b31e1552 3875 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3876 ret = -ENOMEM;
ac27a0ec
DK		 3877 goto failed_mount;
3878 }
3879
705895b6 3880 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3881
3882 for (i = 0; i < db_count; i++) {
70bbb3e0 3883 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3884 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3885 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3886 ext4_msg(sb, KERN_ERR,
3887 "can't read group descriptor %d", i);
ac27a0ec
DK		 3888 db_count = i;
3889 goto failed_mount2;
3890 }
3891 }
829fa70d 3892 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 3893 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3894 ret = -EFSCORRUPTED;
f9ae9cf5 3895 goto failed_mount2;
ac27a0ec 3896 }
772cb7c8 3897
f9ae9cf5 3898 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3899 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3900 spin_lock_init(&sbi->s_next_gen_lock);
3901
04ecddb7
JM		 3902 setup_timer(&sbi->s_err_report, print_daily_error_info,
3903 (unsigned long) sb);
04496411 3904
a75ae78f 3905 /* Register extent status tree shrinker */
eb68d0e2 3906 if (ext4_es_register_shrinker(sbi))
ce7e010a 3907 goto failed_mount3;
ce7e010a 3908
c9de560d 3909 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3910 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3911
f9ae9cf5
TT		 3912 /*
3913 * set up enough so that it can read an inode
3914 */
f6e63f90 3915 sb->s_op = &ext4_sops;
617ba13b
MC		 3916 sb->s_export_op = &ext4_export_ops;
3917 sb->s_xattr = ext4_xattr_handlers;
a7550b30 3918 sb->s_cop = &ext4_cryptops;
ac27a0ec 3919#ifdef CONFIG_QUOTA
617ba13b 3920 sb->dq_op = &ext4_quota_operations;
e2b911c5 3921 if (ext4_has_feature_quota(sb))
1fa5efe3 3922 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3923 else
3924 sb->s_qcop = &ext4_qctl_operations;
689c958c 3925 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 3926#endif
f2fa2ffc
AK		 3927 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3928
ac27a0ec 3929 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3930 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3931
3932 sb->s_root = NULL;
3933
3934 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3935 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3936
e2b911c5 3937 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3938 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3939 goto failed_mount3a;
c5e06d10 3940
ac27a0ec
DK		 3941 /*
3942 * The first inode we look at is the journal inode. Don't try
3943 * root first: it may be modified in the journal!
3944 */
e2b911c5 3945 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 3946 err = ext4_load_journal(sb, es, journal_devnum);
3947 if (err)
50460fe8 3948 goto failed_mount3a;
0390131b 3949 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3950 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3951 ext4_msg(sb, KERN_ERR, "required journal recovery "
3952 "suppressed and not mounted read-only");
744692dc 3953 goto failed_mount_wq;
ac27a0ec 3954 } else {
1e381f60
DM		 3955 /* Nojournal mode, all journal mount options are illegal */
3956 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3957 ext4_msg(sb, KERN_ERR, "can't mount with "
3958 "journal_checksum, fs mounted w/o journal");
3959 goto failed_mount_wq;
3960 }
3961 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3962 ext4_msg(sb, KERN_ERR, "can't mount with "
3963 "journal_async_commit, fs mounted w/o journal");
3964 goto failed_mount_wq;
3965 }
3966 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3967 ext4_msg(sb, KERN_ERR, "can't mount with "
3968 "commit=%lu, fs mounted w/o journal",
3969 sbi->s_commit_interval / HZ);
3970 goto failed_mount_wq;
3971 }
3972 if (EXT4_MOUNT_DATA_FLAGS &
3973 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3974 ext4_msg(sb, KERN_ERR, "can't mount with "
3975 "data=, fs mounted w/o journal");
3976 goto failed_mount_wq;
3977 }
3978 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3979 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3980 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3981 sbi->s_journal = NULL;
3982 needs_recovery = 0;
3983 goto no_journal;
ac27a0ec
DK		 3984 }
3985
e2b911c5 3986 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3987 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3988 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3989 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3990 goto failed_mount_wq;
eb40a09c
JS		 3991 }
3992
25ed6e8a
DW		 3993 if (!set_journal_csum_feature_set(sb)) {
3994 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3995 "feature set");
3996 goto failed_mount_wq;
d4da6c9c 3997 }
818d276c 3998
ac27a0ec
DK		 3999 /* We have now updated the journal if required, so we can
4000 * validate the data journaling mode. */
4001 switch (test_opt(sb, DATA_FLAGS)) {
4002 case 0:
4003 /* No mode set, assume a default based on the journal
63f57933
AM		 4004 * capabilities: ORDERED_DATA if the journal can
4005 * cope, else JOURNAL_DATA
4006 */
dab291af
MC		 4007 if (jbd2_journal_check_available_features
4008 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4009 set_opt(sb, ORDERED_DATA);
ac27a0ec 4010 else
fd8c37ec 4011 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4012 break;
4013
617ba13b
MC		 4014 case EXT4_MOUNT_ORDERED_DATA:
4015 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4016 if (!jbd2_journal_check_available_features
4017 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4018 ext4_msg(sb, KERN_ERR, "Journal does not support "
4019 "requested data journaling mode");
744692dc 4020 goto failed_mount_wq;
ac27a0ec
DK		 4021 }
4022 default:
4023 break;
4024 }
ab04df78
JK		 4025
4026 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4027 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4028 ext4_msg(sb, KERN_ERR, "can't mount with "
4029 "journal_async_commit in data=ordered mode");
4030 goto failed_mount_wq;
4031 }
4032
b3881f74 4033 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4034
18aadd47
BJ		 4035 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4036
ce7e010a 4037no_journal:
2335d05f
AG		 4038 sbi->s_mb_cache = ext4_xattr_create_cache();
4039 if (!sbi->s_mb_cache) {
4040 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4041 goto failed_mount_wq;
9c191f70
M		 4042 }
4043
e2b911c5 4044 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4045 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4046 ext4_msg(sb, KERN_ERR,
4047 "Unsupported blocksize for fs encryption");
4048 goto failed_mount_wq;
4049 }
4050
e2b911c5
DW		 4051 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
4052 !ext4_has_feature_encrypt(sb)) {
4053 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4054 ext4_commit_super(sb, 1);
4055 }
4056
952fc18e
TT		 4057 /*
4058 * Get the # of file system overhead blocks from the
4059 * superblock if present.
4060 */
4061 if (es->s_overhead_clusters)
4062 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4063 else {
07aa2ea1
LC		 4064 err = ext4_calculate_overhead(sb);
4065 if (err)
952fc18e
TT		 4066 goto failed_mount_wq;
4067 }
4068
fd89d5f2
TH		 4069 /*
4070 * The maximum number of concurrent works can be high and
4071 * concurrency isn't really necessary. Limit it to 1.
4072 */
2e8fa54e
JK		 4073 EXT4_SB(sb)->rsv_conversion_wq =
4074 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4075 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4076 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4077 ret = -ENOMEM;
2e8fa54e
JK		 4078 goto failed_mount4;
4079 }
4080
ac27a0ec 4081 /*
dab291af 4082 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4083 * so we can safely mount the rest of the filesystem now.
4084 */
4085
1d1fe1ee
DH		 4086 root = ext4_iget(sb, EXT4_ROOT_INO);
4087 if (IS_ERR(root)) {
b31e1552 4088 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4089 ret = PTR_ERR(root);
32a9bb57 4090 root = NULL;
ac27a0ec
DK		 4091 goto failed_mount4;
4092 }
4093 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4094 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4095 iput(root);
ac27a0ec
DK		 4096 goto failed_mount4;
4097 }
48fde701 4098 sb->s_root = d_make_root(root);
1d1fe1ee 4099 if (!sb->s_root) {
b31e1552 4100 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4101 ret = -ENOMEM;
4102 goto failed_mount4;
4103 }
ac27a0ec 4104
7e84b621
ES		 4105 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4106 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4107
4108 /* determine the minimum size of new large inodes, if present */
670e9875
TT		 4109 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4110 sbi->s_want_extra_isize == 0) {
ef7f3835
KS		 4111 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4112 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 4113 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 4114 if (sbi->s_want_extra_isize <
4115 le16_to_cpu(es->s_want_extra_isize))
4116 sbi->s_want_extra_isize =
4117 le16_to_cpu(es->s_want_extra_isize);
4118 if (sbi->s_want_extra_isize <
4119 le16_to_cpu(es->s_min_extra_isize))
4120 sbi->s_want_extra_isize =
4121 le16_to_cpu(es->s_min_extra_isize);
4122 }
4123 }
4124 /* Check if enough inode space is available */
4125 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4126 sbi->s_inode_size) {
4127 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4128 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4129 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4130 "available");
ef7f3835
KS		 4131 }
4132
b5799018 4133 ext4_set_resv_clusters(sb);
27dd4385 4134
6fd058f7
TT		 4135 err = ext4_setup_system_zone(sb);
4136 if (err) {
b31e1552 4137 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4138 "zone (%d)", err);
f9ae9cf5
TT		 4139 goto failed_mount4a;
4140 }
4141
4142 ext4_ext_init(sb);
4143 err = ext4_mb_init(sb);
4144 if (err) {
4145 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4146 err);
dcf2d804 4147 goto failed_mount5;
c2774d84
AK		 4148 }
4149
d5e03cbb
TT		 4150 block = ext4_count_free_clusters(sb);
4151 ext4_free_blocks_count_set(sbi->s_es,
4152 EXT4_C2B(sbi, block));
908c7f19
TH		 4153 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4154 GFP_KERNEL);
d5e03cbb
TT		 4155 if (!err) {
4156 unsigned long freei = ext4_count_free_inodes(sb);
4157 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4158 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4159 GFP_KERNEL);
d5e03cbb
TT		 4160 }
4161 if (!err)
4162 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4163 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4164 if (!err)
908c7f19
TH		 4165 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4166 GFP_KERNEL);
c8585c6f
DJ		 4167 if (!err)
4168 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4169
d5e03cbb
TT		 4170 if (err) {
4171 ext4_msg(sb, KERN_ERR, "insufficient memory");
4172 goto failed_mount6;
4173 }
4174
e2b911c5 4175 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4176 if (!ext4_fill_flex_info(sb)) {
4177 ext4_msg(sb, KERN_ERR,
4178 "unable to initialize "
4179 "flex_bg meta info!");
4180 goto failed_mount6;
4181 }
4182
bfff6873
LC		 4183 err = ext4_register_li_request(sb, first_not_zeroed);
4184 if (err)
dcf2d804 4185 goto failed_mount6;
bfff6873 4186
b5799018 4187 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4188 if (err)
4189 goto failed_mount7;
3197ebdb 4190
9b2ff357
JK		 4191#ifdef CONFIG_QUOTA
4192 /* Enable quota usage during mount. */
e2b911c5 4193 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 4194 err = ext4_enable_quotas(sb);
4195 if (err)
4196 goto failed_mount8;
4197 }
4198#endif /* CONFIG_QUOTA */
4199
617ba13b
MC		 4200 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4201 ext4_orphan_cleanup(sb, es);
4202 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4203 if (needs_recovery) {
b31e1552 4204 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4205 ext4_mark_recovery_complete(sb, es);
4206 }
4207 if (EXT4_SB(sb)->s_journal) {
4208 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4209 descr = " journalled data mode";
4210 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4211 descr = " ordered data mode";
4212 else
4213 descr = " writeback data mode";
4214 } else
4215 descr = "out journal";
4216
79add3a3
LC		 4217 if (test_opt(sb, DISCARD)) {
4218 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4219 if (!blk_queue_discard(q))
4220 ext4_msg(sb, KERN_WARNING,
4221 "mounting with \"discard\" option, but "
4222 "the device does not support discard");
4223 }
4224
e294a537
TT		 4225 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4226 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4227 "Opts: %.*s%s%s", descr,
4228 (int) sizeof(sbi->s_es->s_mount_opts),
4229 sbi->s_es->s_mount_opts,
e294a537 4230 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4231
66e61a9e
TT		 4232 if (es->s_error_count)
4233 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4234
efbed4dc
TT		 4235 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4236 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4237 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4238 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4239
d4c402d9 4240 kfree(orig_data);
ac27a0ec
DK		 4241 return 0;
4242
617ba13b 4243cantfind_ext4:
ac27a0ec 4244 if (!silent)
b31e1552 4245 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4246 goto failed_mount;
4247
72ba7450
TT		 4248#ifdef CONFIG_QUOTA
4249failed_mount8:
ebd173be 4250 ext4_unregister_sysfs(sb);
72ba7450 4251#endif
dcf2d804
TM		 4252failed_mount7:
4253 ext4_unregister_li_request(sb);
4254failed_mount6:
f9ae9cf5 4255 ext4_mb_release(sb);
d5e03cbb 4256 if (sbi->s_flex_groups)
b93b41d4 4257 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4258 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4259 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4260 percpu_counter_destroy(&sbi->s_dirs_counter);
4261 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4262failed_mount5:
f9ae9cf5
TT		 4263 ext4_ext_release(sb);
4264 ext4_release_system_zone(sb);
4265failed_mount4a:
94bf608a 4266 dput(sb->s_root);
32a9bb57 4267 sb->s_root = NULL;
94bf608a 4268failed_mount4:
b31e1552 4269 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4270 if (EXT4_SB(sb)->rsv_conversion_wq)
4271 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4272failed_mount_wq:
82939d79
JK		 4273 if (sbi->s_mb_cache) {
4274 ext4_xattr_destroy_cache(sbi->s_mb_cache);
4275 sbi->s_mb_cache = NULL;
4276 }
0390131b
FM		 4277 if (sbi->s_journal) {
4278 jbd2_journal_destroy(sbi->s_journal);
4279 sbi->s_journal = NULL;
4280 }
50460fe8 4281failed_mount3a:
d3922a77 4282 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4283failed_mount3:
9105bb14 4284 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4285 if (sbi->s_mmp_tsk)
4286 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4287failed_mount2:
4288 for (i = 0; i < db_count; i++)
4289 brelse(sbi->s_group_desc[i]);
b93b41d4 4290 kvfree(sbi->s_group_desc);
ac27a0ec 4291failed_mount:
0441984a
DW		 4292 if (sbi->s_chksum_driver)
4293 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4294#ifdef CONFIG_QUOTA
a2d4a646 4295 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4296 kfree(sbi->s_qf_names[i]);
4297#endif
617ba13b 4298 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4299 brelse(bh);
4300out_fail:
4301 sb->s_fs_info = NULL;
f6830165 4302 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4303out_free_base:
ac27a0ec 4304 kfree(sbi);
d4c402d9 4305 kfree(orig_data);
07aa2ea1 4306 return err ? err : ret;
ac27a0ec
DK		 4307}
4308
4309/*
4310 * Setup any per-fs journal parameters now. We'll do this both on
4311 * initial mount, once the journal has been initialised but before we've
4312 * done any recovery; and again on any subsequent remount.
4313 */
617ba13b 4314static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4315{
617ba13b 4316 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4317
30773840
TT		 4318 journal->j_commit_interval = sbi->s_commit_interval;
4319 journal->j_min_batch_time = sbi->s_min_batch_time;
4320 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4321
a931da6a 4322 write_lock(&journal->j_state_lock);
ac27a0ec 4323 if (test_opt(sb, BARRIER))
dab291af 4324 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4325 else
dab291af 4326 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4327 if (test_opt(sb, DATA_ERR_ABORT))
4328 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4329 else
4330 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4331 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4332}
4333
c6cb7e77
EW		 4334static struct inode *ext4_get_journal_inode(struct super_block *sb,
4335 unsigned int journal_inum)
ac27a0ec
DK		 4336{
4337 struct inode *journal_inode;
ac27a0ec 4338
c6cb7e77
EW		 4339 /*
4340 * Test for the existence of a valid inode on disk. Bad things
4341 * happen if we iget() an unused inode, as the subsequent iput()
4342 * will try to delete it.
4343 */
1d1fe1ee
DH		 4344 journal_inode = ext4_iget(sb, journal_inum);
4345 if (IS_ERR(journal_inode)) {
b31e1552 4346 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4347 return NULL;
4348 }
4349 if (!journal_inode->i_nlink) {
4350 make_bad_inode(journal_inode);
4351 iput(journal_inode);
b31e1552 4352 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4353 return NULL;
4354 }
4355
e5f8eab8 4356 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4357 journal_inode, journal_inode->i_size);
1d1fe1ee 4358 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4359 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4360 iput(journal_inode);
4361 return NULL;
4362 }
c6cb7e77
EW		 4363 return journal_inode;
4364}
4365
4366static journal_t *ext4_get_journal(struct super_block *sb,
4367 unsigned int journal_inum)
4368{
4369 struct inode *journal_inode;
4370 journal_t *journal;
4371
4372 BUG_ON(!ext4_has_feature_journal(sb));
4373
4374 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4375 if (!journal_inode)
4376 return NULL;
ac27a0ec 4377
dab291af 4378 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4379 if (!journal) {
b31e1552 4380 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4381 iput(journal_inode);
4382 return NULL;
4383 }
4384 journal->j_private = sb;
617ba13b 4385 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4386 return journal;
4387}
4388
617ba13b 4389static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4390 dev_t j_dev)
4391{
2b2d6d01 4392 struct buffer_head *bh;
ac27a0ec 4393 journal_t *journal;
617ba13b
MC		 4394 ext4_fsblk_t start;
4395 ext4_fsblk_t len;
ac27a0ec 4396 int hblock, blocksize;
617ba13b 4397 ext4_fsblk_t sb_block;
ac27a0ec 4398 unsigned long offset;
2b2d6d01 4399 struct ext4_super_block *es;
ac27a0ec
DK		 4400 struct block_device *bdev;
4401
e2b911c5 4402 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4403
b31e1552 4404 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4405 if (bdev == NULL)
4406 return NULL;
4407
ac27a0ec 4408 blocksize = sb->s_blocksize;
e1defc4f 4409 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4410 if (blocksize < hblock) {
b31e1552
ES		 4411 ext4_msg(sb, KERN_ERR,
4412 "blocksize too small for journal device");
ac27a0ec
DK		 4413 goto out_bdev;
4414 }
4415
617ba13b
MC		 4416 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4417 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4418 set_blocksize(bdev, blocksize);
4419 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4420 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4421 "external journal");
ac27a0ec
DK		 4422 goto out_bdev;
4423 }
4424
2716b802 4425 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4426 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4427 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4428 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4429 ext4_msg(sb, KERN_ERR, "external journal has "
4430 "bad superblock");
ac27a0ec
DK		 4431 brelse(bh);
4432 goto out_bdev;
4433 }
4434
df4763be
DW		 4435 if ((le32_to_cpu(es->s_feature_ro_compat) &
4436 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4437 es->s_checksum != ext4_superblock_csum(sb, es)) {
4438 ext4_msg(sb, KERN_ERR, "external journal has "
4439 "corrupt superblock");
4440 brelse(bh);
4441 goto out_bdev;
4442 }
4443
617ba13b 4444 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4445 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4446 brelse(bh);
4447 goto out_bdev;
4448 }
4449
bd81d8ee 4450 len = ext4_blocks_count(es);
ac27a0ec
DK		 4451 start = sb_block + 1;
4452 brelse(bh); /* we're done with the superblock */
4453
dab291af 4454 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4455 start, len, blocksize);
4456 if (!journal) {
b31e1552 4457 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4458 goto out_bdev;
4459 }
4460 journal->j_private = sb;
dfec8a14 4461 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4462 wait_on_buffer(journal->j_sb_buffer);
4463 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4464 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4465 goto out_journal;
4466 }
4467 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4468 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4469 "user (unsupported) - %d",
ac27a0ec
DK		 4470 be32_to_cpu(journal->j_superblock->s_nr_users));
4471 goto out_journal;
4472 }
617ba13b
MC		 4473 EXT4_SB(sb)->journal_bdev = bdev;
4474 ext4_init_journal_params(sb, journal);
ac27a0ec 4475 return journal;
0b8e58a1 4476
ac27a0ec 4477out_journal:
dab291af 4478 jbd2_journal_destroy(journal);
ac27a0ec 4479out_bdev:
617ba13b 4480 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4481 return NULL;
4482}
4483
617ba13b
MC		 4484static int ext4_load_journal(struct super_block *sb,
4485 struct ext4_super_block *es,
ac27a0ec
DK		 4486 unsigned long journal_devnum)
4487{
4488 journal_t *journal;
4489 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4490 dev_t journal_dev;
4491 int err = 0;
4492 int really_read_only;
4493
e2b911c5 4494 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4495
ac27a0ec
DK		 4496 if (journal_devnum &&
4497 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4498 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4499 "numbers have changed");
ac27a0ec
DK		 4500 journal_dev = new_decode_dev(journal_devnum);
4501 } else
4502 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4503
4504 really_read_only = bdev_read_only(sb->s_bdev);
4505
4506 /*
4507 * Are we loading a blank journal or performing recovery after a
4508 * crash? For recovery, we need to check in advance whether we
4509 * can get read-write access to the device.
4510 */
e2b911c5 4511 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4512 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4513 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4514 "required on readonly filesystem");
ac27a0ec 4515 if (really_read_only) {
b31e1552
ES		 4516 ext4_msg(sb, KERN_ERR, "write access "
4517 "unavailable, cannot proceed");
ac27a0ec
DK		 4518 return -EROFS;
4519 }
b31e1552
ES		 4520 ext4_msg(sb, KERN_INFO, "write access will "
4521 "be enabled during recovery");
ac27a0ec
DK		 4522 }
4523 }
4524
4525 if (journal_inum && journal_dev) {
b31e1552
ES		 4526 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4527 "and inode journals!");
ac27a0ec
DK		 4528 return -EINVAL;
4529 }
4530
4531 if (journal_inum) {
617ba13b 4532 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4533 return -EINVAL;
4534 } else {
617ba13b 4535 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4536 return -EINVAL;
4537 }
4538
90576c0b 4539 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4540 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4541
e2b911c5 4542 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4543 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4544 if (!err) {
4545 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4546 if (save)
4547 memcpy(save, ((char *) es) +
4548 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4549 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4550 if (save)
4551 memcpy(((char *) es) + EXT4_S_ERR_START,
4552 save, EXT4_S_ERR_LEN);
4553 kfree(save);
4554 }
ac27a0ec
DK		 4555
4556 if (err) {
b31e1552 4557 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4558 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4559 return err;
4560 }
4561
617ba13b
MC		 4562 EXT4_SB(sb)->s_journal = journal;
4563 ext4_clear_journal_err(sb, es);
ac27a0ec 4564
c41303ce 4565 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4566 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4567 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4568
4569 /* Make sure we flush the recovery flag to disk. */
e2d67052 4570 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4571 }
4572
4573 return 0;
4574}
4575
e2d67052 4576static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4577{
e2d67052 4578 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4579 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4580 int error = 0;
ac27a0ec 4581
bdfe0cbd 4582 if (!sbh || block_device_ejected(sb))
c4be0c1d 4583 return error;
71290b36
TT		 4584 /*
4585 * If the file system is mounted read-only, don't update the
4586 * superblock write time. This avoids updating the superblock
4587 * write time when we are mounting the root file system
4588 * read/only but we need to replay the journal; at that point,
4589 * for people who are east of GMT and who make their clock
4590 * tick in localtime for Windows bug-for-bug compatibility,
4591 * the clock is set in the future, and this will cause e2fsck
4592 * to complain and force a full file system check.
4593 */
4594 if (!(sb->s_flags & MS_RDONLY))
4595 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4596 if (sb->s_bdev->bd_part)
4597 es->s_kbytes_written =
4598 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4599 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4600 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4601 else
4602 es->s_kbytes_written =
4603 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4604 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4605 ext4_free_blocks_count_set(es,
57042651
TT		 4606 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4607 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4608 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4609 es->s_free_inodes_count =
4610 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4611 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4612 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4613 ext4_superblock_csum_set(sb);
1566a48a
TT		 4614 if (sync)
4615 lock_buffer(sbh);
4743f839
PKS		 4616 if (buffer_write_io_error(sbh)) {
4617 /*
4618 * Oh, dear. A previous attempt to write the
4619 * superblock failed. This could happen because the
4620 * USB device was yanked out. Or it could happen to
4621 * be a transient write error and maybe the block will
4622 * be remapped. Nothing we can do but to retry the
4623 * write and hope for the best.
4624 */
4625 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4626 "superblock detected");
4627 clear_buffer_write_io_error(sbh);
4628 set_buffer_uptodate(sbh);
4629 }
ac27a0ec 4630 mark_buffer_dirty(sbh);
914258bf 4631 if (sync) {
1566a48a 4632 unlock_buffer(sbh);
564bc402 4633 error = __sync_dirty_buffer(sbh,
70fd7614 4634 test_opt(sb, BARRIER) ? REQ_FUA : REQ_SYNC);
c4be0c1d
TS		 4635 if (error)
4636 return error;
4637
4638 error = buffer_write_io_error(sbh);
4639 if (error) {
b31e1552
ES		 4640 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4641 "superblock");
914258bf
TT		 4642 clear_buffer_write_io_error(sbh);
4643 set_buffer_uptodate(sbh);
4644 }
4645 }
c4be0c1d 4646 return error;
ac27a0ec
DK		 4647}
4648
ac27a0ec
DK		 4649/*
4650 * Have we just finished recovery? If so, and if we are mounting (or
4651 * remounting) the filesystem readonly, then we will end up with a
4652 * consistent fs on disk. Record that fact.
4653 */
2b2d6d01
TT		 4654static void ext4_mark_recovery_complete(struct super_block *sb,
4655 struct ext4_super_block *es)
ac27a0ec 4656{
617ba13b 4657 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4658
e2b911c5 4659 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4660 BUG_ON(journal != NULL);
4661 return;
4662 }
dab291af 4663 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4664 if (jbd2_journal_flush(journal) < 0)
4665 goto out;
4666
e2b911c5 4667 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4668 sb->s_flags & MS_RDONLY) {
e2b911c5 4669 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4670 ext4_commit_super(sb, 1);
ac27a0ec 4671 }
7ffe1ea8
HK		 4672
4673out:
dab291af 4674 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4675}
4676
4677/*
4678 * If we are mounting (or read-write remounting) a filesystem whose journal
4679 * has recorded an error from a previous lifetime, move that error to the
4680 * main filesystem now.
4681 */
2b2d6d01
TT		 4682static void ext4_clear_journal_err(struct super_block *sb,
4683 struct ext4_super_block *es)
ac27a0ec
DK		 4684{
4685 journal_t *journal;
4686 int j_errno;
4687 const char *errstr;
4688
e2b911c5 4689 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4690
617ba13b 4691 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4692
4693 /*
4694 * Now check for any error status which may have been recorded in the
617ba13b 4695 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4696 */
4697
dab291af 4698 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4699 if (j_errno) {
4700 char nbuf[16];
4701
617ba13b 4702 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4703 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4704 "from previous mount: %s", errstr);
12062ddd 4705 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4706
617ba13b
MC		 4707 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4708 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4709 ext4_commit_super(sb, 1);
ac27a0ec 4710
dab291af 4711 jbd2_journal_clear_err(journal);
d796c52e 4712 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4713 }
4714}
4715
4716/*
4717 * Force the running and committing transactions to commit,
4718 * and wait on the commit.
4719 */
617ba13b 4720int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4721{
4722 journal_t *journal;
ac27a0ec
DK		 4723
4724 if (sb->s_flags & MS_RDONLY)
4725 return 0;
4726
617ba13b 4727 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4728 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4729}
4730
617ba13b 4731static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4732{
14ce0cb4 4733 int ret = 0;
9eddacf9 4734 tid_t target;
06a407f1 4735 bool needs_barrier = false;
8d5d02e6 4736 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4737
0db1ff22
TT		 4738 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
4739 return 0;
4740
9bffad1e 4741 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4742 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4743 /*
4744 * Writeback quota in non-journalled quota case - journalled quota has
4745 * no dirty dquots
4746 */
4747 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4748 /*
4749 * Data writeback is possible w/o journal transaction, so barrier must
4750 * being sent at the end of the function. But we can skip it if
4751 * transaction_commit will do it for us.
4752 */
bda32530
TT		 4753 if (sbi->s_journal) {
4754 target = jbd2_get_latest_transaction(sbi->s_journal);
4755 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4756 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4757 needs_barrier = true;
4758
4759 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4760 if (wait)
4761 ret = jbd2_log_wait_commit(sbi->s_journal,
4762 target);
4763 }
4764 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4765 needs_barrier = true;
06a407f1
DM		 4766 if (needs_barrier) {
4767 int err;
4768 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4769 if (!ret)
4770 ret = err;
0390131b 4771 }
06a407f1
DM		 4772
4773 return ret;
4774}
4775
ac27a0ec
DK		 4776/*
4777 * LVM calls this function before a (read-only) snapshot is created. This
4778 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4779 *
4780 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4781 * state independently. It relies on upper layer to stop all data & metadata
4782 * modifications.
ac27a0ec 4783 */
c4be0c1d 4784static int ext4_freeze(struct super_block *sb)
ac27a0ec 4785{
c4be0c1d
TS		 4786 int error = 0;
4787 journal_t *journal;
ac27a0ec 4788
9ca92389
TT		 4789 if (sb->s_flags & MS_RDONLY)
4790 return 0;
ac27a0ec 4791
9ca92389 4792 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4793
bb044576
TT		 4794 if (journal) {
4795 /* Now we set up the journal barrier. */
4796 jbd2_journal_lock_updates(journal);
ac27a0ec 4797
bb044576
TT		 4798 /*
4799 * Don't clear the needs_recovery flag if we failed to
4800 * flush the journal.
4801 */
4802 error = jbd2_journal_flush(journal);
4803 if (error < 0)
4804 goto out;
c642dc9e
ES		 4805
4806 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4807 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4808 }
9ca92389 4809
9ca92389 4810 error = ext4_commit_super(sb, 1);
6b0310fb 4811out:
bb044576
TT		 4812 if (journal)
4813 /* we rely on upper layer to stop further updates */
4814 jbd2_journal_unlock_updates(journal);
6b0310fb 4815 return error;
ac27a0ec
DK		 4816}
4817
4818/*
4819 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4820 * flag here, even though the filesystem is not technically dirty yet.
4821 */
c4be0c1d 4822static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4823{
783d9485 4824 if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 4825 return 0;
4826
c642dc9e
ES		 4827 if (EXT4_SB(sb)->s_journal) {
4828 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4829 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4830 }
4831
9ca92389 4832 ext4_commit_super(sb, 1);
c4be0c1d 4833 return 0;
ac27a0ec
DK		 4834}
4835
673c6100
TT		 4836/*
4837 * Structure to save mount options for ext4_remount's benefit
4838 */
4839struct ext4_mount_options {
4840 unsigned long s_mount_opt;
a2595b8a 4841 unsigned long s_mount_opt2;
08cefc7a
EB		 4842 kuid_t s_resuid;
4843 kgid_t s_resgid;
673c6100
TT		 4844 unsigned long s_commit_interval;
4845 u32 s_min_batch_time, s_max_batch_time;
4846#ifdef CONFIG_QUOTA
4847 int s_jquota_fmt;
a2d4a646 4848 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4849#endif
4850};
4851
2b2d6d01 4852static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4853{
2b2d6d01 4854 struct ext4_super_block *es;
617ba13b 4855 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4856 unsigned long old_sb_flags;
617ba13b 4857 struct ext4_mount_options old_opts;
c79d967d 4858 int enable_quota = 0;
8a266467 4859 ext4_group_t g;
b3881f74 4860 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4861 int err = 0;
ac27a0ec 4862#ifdef CONFIG_QUOTA
03dafb5f 4863 int i, j;
ac27a0ec 4864#endif
d4c402d9 4865 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4866
4867 /* Store the original options */
4868 old_sb_flags = sb->s_flags;
4869 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4870 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4871 old_opts.s_resuid = sbi->s_resuid;
4872 old_opts.s_resgid = sbi->s_resgid;
4873 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4874 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4875 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4876#ifdef CONFIG_QUOTA
4877 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4878 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4879 if (sbi->s_qf_names[i]) {
4880 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4881 GFP_KERNEL);
4882 if (!old_opts.s_qf_names[i]) {
4883 for (j = 0; j < i; j++)
4884 kfree(old_opts.s_qf_names[j]);
3e36a163 4885 kfree(orig_data);
03dafb5f
CG		 4886 return -ENOMEM;
4887 }
4888 } else
4889 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4890#endif
b3881f74
TT		 4891 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4892 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4893
661aa520 4894 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4895 err = -EINVAL;
4896 goto restore_opts;
4897 }
4898
6b992ff2 4899 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4900 test_opt(sb, JOURNAL_CHECKSUM)) {
4901 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4902 "during remount not supported; ignoring");
4903 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4904 }
4905
6ae6514b
PS		 4906 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4907 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4908 ext4_msg(sb, KERN_ERR, "can't mount with "
4909 "both data=journal and delalloc");
4910 err = -EINVAL;
4911 goto restore_opts;
4912 }
4913 if (test_opt(sb, DIOREAD_NOLOCK)) {
4914 ext4_msg(sb, KERN_ERR, "can't mount with "
4915 "both data=journal and dioread_nolock");
4916 err = -EINVAL;
4917 goto restore_opts;
4918 }
923ae0ff
RZ		 4919 if (test_opt(sb, DAX)) {
4920 ext4_msg(sb, KERN_ERR, "can't mount with "
4921 "both data=journal and dax");
4922 err = -EINVAL;
4923 goto restore_opts;
4924 }
ab04df78
JK		 4925 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
4926 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4927 ext4_msg(sb, KERN_ERR, "can't mount with "
4928 "journal_async_commit in data=ordered mode");
4929 err = -EINVAL;
4930 goto restore_opts;
4931 }
923ae0ff
RZ		 4932 }
4933
4934 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4935 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4936 "dax flag with busy inodes while remounting");
4937 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4938 }
4939
4ab2f15b 4940 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4941 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4942
4943 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4944 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4945
4946 es = sbi->s_es;
4947
b3881f74 4948 if (sbi->s_journal) {
0390131b 4949 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4950 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4951 }
ac27a0ec 4952
a2fd66d0
TT		 4953 if (*flags & MS_LAZYTIME)
4954 sb->s_flags |= MS_LAZYTIME;
4955
661aa520 4956 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4957 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4958 err = -EROFS;
4959 goto restore_opts;
4960 }
4961
4962 if (*flags & MS_RDONLY) {
38c03b34
TT		 4963 err = sync_filesystem(sb);
4964 if (err < 0)
4965 goto restore_opts;
0f0dd62f
CH		 4966 err = dquot_suspend(sb, -1);
4967 if (err < 0)
c79d967d 4968 goto restore_opts;
c79d967d 4969
ac27a0ec
DK		 4970 /*
4971 * First of all, the unconditional stuff we have to do
4972 * to disable replay of the journal when we next remount
4973 */
4974 sb->s_flags |= MS_RDONLY;
4975
4976 /*
4977 * OK, test if we are remounting a valid rw partition
4978 * readonly, and if so set the rdonly flag and then
4979 * mark the partition as valid again.
4980 */
617ba13b
MC		 4981 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4982 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4983 es->s_state = cpu_to_le16(sbi->s_mount_state);
4984
a63c9eb2 4985 if (sbi->s_journal)
0390131b 4986 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4987 } else {
a13fb1a4 4988 /* Make sure we can mount this feature set readwrite */
e2b911c5 4989 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4990 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4991 err = -EROFS;
4992 goto restore_opts;
4993 }
8a266467
TT		 4994 /*
4995 * Make sure the group descriptor checksums
0b8e58a1 4996 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4997 */
4998 for (g = 0; g < sbi->s_groups_count; g++) {
4999 struct ext4_group_desc *gdp =
5000 ext4_get_group_desc(sb, g, NULL);
5001
feb0ab32 5002 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5003 ext4_msg(sb, KERN_ERR,
5004 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5005 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5006 le16_to_cpu(gdp->bg_checksum));
6a797d27 5007 err = -EFSBADCRC;
8a266467
TT		 5008 goto restore_opts;
5009 }
5010 }
5011
ead6596b
ES		 5012 /*
5013 * If we have an unprocessed orphan list hanging
5014 * around from a previously readonly bdev mount,
5015 * require a full umount/remount for now.
5016 */
5017 if (es->s_last_orphan) {
b31e1552 5018 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5019 "remount RDWR because of unprocessed "
5020 "orphan inode list. Please "
b31e1552 5021 "umount/remount instead");
ead6596b
ES		 5022 err = -EINVAL;
5023 goto restore_opts;
5024 }
5025
ac27a0ec
DK		 5026 /*
5027 * Mounting a RDONLY partition read-write, so reread
5028 * and store the current valid flag. (It may have
5029 * been changed by e2fsck since we originally mounted
5030 * the partition.)
5031 */
0390131b
FM		 5032 if (sbi->s_journal)
5033 ext4_clear_journal_err(sb, es);
ac27a0ec 5034 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 5035 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 5036 sb->s_flags &= ~MS_RDONLY;
e2b911c5 5037 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5038 if (ext4_multi_mount_protect(sb,
5039 le64_to_cpu(es->s_mmp_block))) {
5040 err = -EROFS;
5041 goto restore_opts;
5042 }
c79d967d 5043 enable_quota = 1;
ac27a0ec
DK		 5044 }
5045 }
bfff6873
LC		 5046
5047 /*
5048 * Reinitialize lazy itable initialization thread based on
5049 * current settings
5050 */
5051 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
5052 ext4_unregister_li_request(sb);
5053 else {
5054 ext4_group_t first_not_zeroed;
5055 first_not_zeroed = ext4_has_uninit_itable(sb);
5056 ext4_register_li_request(sb, first_not_zeroed);
5057 }
5058
6fd058f7 5059 ext4_setup_system_zone(sb);
d096ad0f 5060 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 5061 ext4_commit_super(sb, 1);
0390131b 5062
ac27a0ec
DK		 5063#ifdef CONFIG_QUOTA
5064 /* Release old quota file names */
a2d4a646 5065 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5066 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5067 if (enable_quota) {
5068 if (sb_any_quota_suspended(sb))
5069 dquot_resume(sb, -1);
e2b911c5 5070 else if (ext4_has_feature_quota(sb)) {
7c319d32 5071 err = ext4_enable_quotas(sb);
07724f98 5072 if (err)
7c319d32 5073 goto restore_opts;
7c319d32
AK		 5074 }
5075 }
ac27a0ec 5076#endif
d4c402d9 5077
a26f4992 5078 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 5079 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5080 kfree(orig_data);
ac27a0ec 5081 return 0;
0b8e58a1 5082
ac27a0ec
DK		 5083restore_opts:
5084 sb->s_flags = old_sb_flags;
5085 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5086 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5087 sbi->s_resuid = old_opts.s_resuid;
5088 sbi->s_resgid = old_opts.s_resgid;
5089 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5090 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5091 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5092#ifdef CONFIG_QUOTA
5093 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5094 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5095 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5096 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5097 }
5098#endif
d4c402d9 5099 kfree(orig_data);
ac27a0ec
DK		 5100 return err;
5101}
5102
689c958c
LX		 5103#ifdef CONFIG_QUOTA
5104static int ext4_statfs_project(struct super_block *sb,
5105 kprojid_t projid, struct kstatfs *buf)
5106{
5107 struct kqid qid;
5108 struct dquot *dquot;
5109 u64 limit;
5110 u64 curblock;
5111
5112 qid = make_kqid_projid(projid);
5113 dquot = dqget(sb, qid);
5114 if (IS_ERR(dquot))
5115 return PTR_ERR(dquot);
5116 spin_lock(&dq_data_lock);
5117
5118 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5119 dquot->dq_dqb.dqb_bsoftlimit :
5120 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5121 if (limit && buf->f_blocks > limit) {
5122 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5123 buf->f_blocks = limit;
5124 buf->f_bfree = buf->f_bavail =
5125 (buf->f_blocks > curblock) ?
5126 (buf->f_blocks - curblock) : 0;
5127 }
5128
5129 limit = dquot->dq_dqb.dqb_isoftlimit ?
5130 dquot->dq_dqb.dqb_isoftlimit :
5131 dquot->dq_dqb.dqb_ihardlimit;
5132 if (limit && buf->f_files > limit) {
5133 buf->f_files = limit;
5134 buf->f_ffree =
5135 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5136 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5137 }
5138
5139 spin_unlock(&dq_data_lock);
5140 dqput(dquot);
5141 return 0;
5142}
5143#endif
5144
2b2d6d01 5145static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5146{
5147 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5148 struct ext4_sb_info *sbi = EXT4_SB(sb);
5149 struct ext4_super_block *es = sbi->s_es;
27dd4385 5150 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5151 u64 fsid;
d02a9391 5152 s64 bfree;
27dd4385 5153 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5154
952fc18e
TT		 5155 if (!test_opt(sb, MINIX_DF))
5156 overhead = sbi->s_overhead;
ac27a0ec 5157
617ba13b 5158 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5159 buf->f_bsize = sb->s_blocksize;
b72f78cb 5160 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5161 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5162 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5163 /* prevent underflow in case that few free space is available */
57042651 5164 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5165 buf->f_bavail = buf->f_bfree -
5166 (ext4_r_blocks_count(es) + resv_blocks);
5167 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5168 buf->f_bavail = 0;
5169 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5170 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5171 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5172 fsid = le64_to_cpup((void *)es->s_uuid) ^
5173 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5174 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5175 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5176
689c958c
LX		 5177#ifdef CONFIG_QUOTA
5178 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5179 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5180 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5181#endif
ac27a0ec
DK		 5182 return 0;
5183}
5184
0b8e58a1
AD		 5185/* Helper function for writing quotas on sync - we need to start transaction
5186 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5187 * Process 1 Process 2
617ba13b 5188 * ext4_create() quota_sync()
a269eb18 5189 * jbd2_journal_start() write_dquot()
871a2931 5190 * dquot_initialize() down(dqio_mutex)
dab291af 5191 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5192 *
5193 */
5194
5195#ifdef CONFIG_QUOTA
5196
5197static inline struct inode *dquot_to_inode(struct dquot *dquot)
5198{
4c376dca 5199 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5200}
5201
617ba13b 5202static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5203{
5204 int ret, err;
5205 handle_t *handle;
5206 struct inode *inode;
5207
5208 inode = dquot_to_inode(dquot);
9924a92a 5209 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5210 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5211 if (IS_ERR(handle))
5212 return PTR_ERR(handle);
5213 ret = dquot_commit(dquot);
617ba13b 5214 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5215 if (!ret)
5216 ret = err;
5217 return ret;
5218}
5219
617ba13b 5220static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5221{
5222 int ret, err;
5223 handle_t *handle;
5224
9924a92a 5225 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5226 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5227 if (IS_ERR(handle))
5228 return PTR_ERR(handle);
5229 ret = dquot_acquire(dquot);
617ba13b 5230 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5231 if (!ret)
5232 ret = err;
5233 return ret;
5234}
5235
617ba13b 5236static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5237{
5238 int ret, err;
5239 handle_t *handle;
5240
9924a92a 5241 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5242 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5243 if (IS_ERR(handle)) {
5244 /* Release dquot anyway to avoid endless cycle in dqput() */
5245 dquot_release(dquot);
ac27a0ec 5246 return PTR_ERR(handle);
9c3013e9 5247 }
ac27a0ec 5248 ret = dquot_release(dquot);
617ba13b 5249 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5250 if (!ret)
5251 ret = err;
5252 return ret;
5253}
5254
617ba13b 5255static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5256{
262b4662
JK		 5257 struct super_block *sb = dquot->dq_sb;
5258 struct ext4_sb_info *sbi = EXT4_SB(sb);
5259
2c8be6b2 5260 /* Are we journaling quotas? */
e2b911c5 5261 if (ext4_has_feature_quota(sb) ||
262b4662 5262 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5263 dquot_mark_dquot_dirty(dquot);
617ba13b 5264 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5265 } else {
5266 return dquot_mark_dquot_dirty(dquot);
5267 }
5268}
5269
617ba13b 5270static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5271{
5272 int ret, err;
5273 handle_t *handle;
5274
5275 /* Data block + inode block */
2b0143b5 5276 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5277 if (IS_ERR(handle))
5278 return PTR_ERR(handle);
5279 ret = dquot_commit_info(sb, type);
617ba13b 5280 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5281 if (!ret)
5282 ret = err;
5283 return ret;
5284}
5285
5286/*
5287 * Turn on quotas during mount time - we need to find
5288 * the quota file and such...
5289 */
617ba13b 5290static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5291{
287a8095
CH		 5292 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5293 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5294}
5295
daf647d2
TT		 5296static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5297{
5298 struct ext4_inode_info *ei = EXT4_I(inode);
5299
5300 /* The first argument of lockdep_set_subclass has to be
5301 * *exactly* the same as the argument to init_rwsem() --- in
5302 * this case, in init_once() --- or lockdep gets unhappy
5303 * because the name of the lock is set using the
5304 * stringification of the argument to init_rwsem().
5305 */
5306 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5307 lockdep_set_subclass(&ei->i_data_sem, subclass);
5308}
5309
ac27a0ec
DK		 5310/*
5311 * Standard function to be called on quota_on
5312 */
617ba13b 5313static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5314 const struct path *path)
ac27a0ec
DK		 5315{
5316 int err;
ac27a0ec
DK		 5317
5318 if (!test_opt(sb, QUOTA))
5319 return -EINVAL;
0623543b 5320
ac27a0ec 5321 /* Quotafile not on the same filesystem? */
d8c9584e 5322 if (path->dentry->d_sb != sb)
ac27a0ec 5323 return -EXDEV;
0623543b
JK		 5324 /* Journaling quota? */
5325 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5326 /* Quotafile not in fs root? */
f00c9e44 5327 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5328 ext4_msg(sb, KERN_WARNING,
5329 "Quota file not on filesystem root. "
5330 "Journaled quota will not work");
2b2d6d01 5331 }
0623543b
JK		 5332
5333 /*
5334 * When we journal data on quota file, we have to flush journal to see
5335 * all updates to the file when we bypass pagecache...
5336 */
0390131b 5337 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5338 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5339 /*
5340 * We don't need to lock updates but journal_flush() could
5341 * otherwise be livelocked...
5342 */
5343 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5344 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5345 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5346 if (err)
7ffe1ea8 5347 return err;
0623543b 5348 }
daf647d2
TT		 5349 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5350 err = dquot_quota_on(sb, type, format_id, path);
5351 if (err)
5352 lockdep_set_quota_inode(path->dentry->d_inode,
5353 I_DATA_SEM_NORMAL);
5354 return err;
ac27a0ec
DK		 5355}
5356
7c319d32
AK		 5357static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5358 unsigned int flags)
5359{
5360 int err;
5361 struct inode *qf_inode;
a2d4a646 5362 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5363 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5364 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5365 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5366 };
5367
e2b911c5 5368 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5369
5370 if (!qf_inums[type])
5371 return -EPERM;
5372
5373 qf_inode = ext4_iget(sb, qf_inums[type]);
5374 if (IS_ERR(qf_inode)) {
5375 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5376 return PTR_ERR(qf_inode);
5377 }
5378
bcb13850
JK		 5379 /* Don't account quota for quota files to avoid recursion */
5380 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5381 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5382 err = dquot_enable(qf_inode, type, format_id, flags);
5383 iput(qf_inode);
daf647d2
TT		 5384 if (err)
5385 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5386
5387 return err;
5388}
5389
5390/* Enable usage tracking for all quota types. */
5391static int ext4_enable_quotas(struct super_block *sb)
5392{
5393 int type, err = 0;
a2d4a646 5394 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5395 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5396 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5397 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5398 };
49da9392
JK		 5399 bool quota_mopt[EXT4_MAXQUOTAS] = {
5400 test_opt(sb, USRQUOTA),
5401 test_opt(sb, GRPQUOTA),
5402 test_opt(sb, PRJQUOTA),
5403 };
7c319d32
AK		 5404
5405 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5406 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5407 if (qf_inums[type]) {
5408 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5409 DQUOT_USAGE_ENABLED |
5410 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5411 if (err) {
5412 ext4_warning(sb,
72ba7450
TT		 5413 "Failed to enable quota tracking "
5414 "(type=%d, err=%d). Please run "
5415 "e2fsck to fix.", type, err);
7c319d32
AK		 5416 return err;
5417 }
5418 }
5419 }
5420 return 0;
5421}
5422
ca0e05e4
DM		 5423static int ext4_quota_off(struct super_block *sb, int type)
5424{
21f97697
JK		 5425 struct inode *inode = sb_dqopt(sb)->files[type];
5426 handle_t *handle;
5427
87009d86
DM		 5428 /* Force all delayed allocation blocks to be allocated.
5429 * Caller already holds s_umount sem */
5430 if (test_opt(sb, DELALLOC))
ca0e05e4 5431 sync_filesystem(sb);
ca0e05e4 5432
0b268590
AG		 5433 if (!inode)
5434 goto out;
5435
21f97697
JK		 5436 /* Update modification times of quota files when userspace can
5437 * start looking at them */
9924a92a 5438 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5439 if (IS_ERR(handle))
5440 goto out;
eeca7ea1 5441 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5442 ext4_mark_inode_dirty(handle, inode);
5443 ext4_journal_stop(handle);
5444
5445out:
ca0e05e4
DM		 5446 return dquot_quota_off(sb, type);
5447}
5448
ac27a0ec
DK		 5449/* Read data from quotafile - avoid pagecache and such because we cannot afford
5450 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5451 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5452 * we don't have to be afraid of races */
617ba13b 5453static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5454 size_t len, loff_t off)
5455{
5456 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5457 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5458 int offset = off & (sb->s_blocksize - 1);
5459 int tocopy;
5460 size_t toread;
5461 struct buffer_head *bh;
5462 loff_t i_size = i_size_read(inode);
5463
5464 if (off > i_size)
5465 return 0;
5466 if (off+len > i_size)
5467 len = i_size-off;
5468 toread = len;
5469 while (toread > 0) {
5470 tocopy = sb->s_blocksize - offset < toread ?
5471 sb->s_blocksize - offset : toread;
1c215028
TT		 5472 bh = ext4_bread(NULL, inode, blk, 0);
5473 if (IS_ERR(bh))
5474 return PTR_ERR(bh);
ac27a0ec
DK		 5475 if (!bh) /* A hole? */
5476 memset(data, 0, tocopy);
5477 else
5478 memcpy(data, bh->b_data+offset, tocopy);
5479 brelse(bh);
5480 offset = 0;
5481 toread -= tocopy;
5482 data += tocopy;
5483 blk++;
5484 }
5485 return len;
5486}
5487
5488/* Write to quotafile (we know the transaction is already started and has
5489 * enough credits) */
617ba13b 5490static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5491 const char *data, size_t len, loff_t off)
5492{
5493 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5494 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5495 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5496 int retries = 0;
ac27a0ec
DK		 5497 struct buffer_head *bh;
5498 handle_t *handle = journal_current_handle();
5499
0390131b 5500 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5501 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5502 " cancelled because transaction is not started",
9c3013e9
JK		 5503 (unsigned long long)off, (unsigned long long)len);
5504 return -EIO;
5505 }
67eeb568
DM		 5506 /*
5507 * Since we account only one data block in transaction credits,
5508 * then it is impossible to cross a block boundary.
5509 */
5510 if (sb->s_blocksize - offset < len) {
5511 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5512 " cancelled because not block aligned",
5513 (unsigned long long)off, (unsigned long long)len);
5514 return -EIO;
5515 }
5516
c5e298ae
TT		 5517 do {
5518 bh = ext4_bread(handle, inode, blk,
5519 EXT4_GET_BLOCKS_CREATE |
5520 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5521 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5522 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5523 if (IS_ERR(bh))
5524 return PTR_ERR(bh);
67eeb568
DM		 5525 if (!bh)
5526 goto out;
5d601255 5527 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5528 err = ext4_journal_get_write_access(handle, bh);
5529 if (err) {
5530 brelse(bh);
1c215028 5531 return err;
ac27a0ec 5532 }
67eeb568
DM		 5533 lock_buffer(bh);
5534 memcpy(bh->b_data+offset, data, len);
5535 flush_dcache_page(bh->b_page);
5536 unlock_buffer(bh);
62d2b5f2 5537 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5538 brelse(bh);
ac27a0ec 5539out:
67eeb568
DM		 5540 if (inode->i_size < off + len) {
5541 i_size_write(inode, off + len);
617ba13b 5542 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5543 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5544 }
67eeb568 5545 return len;
ac27a0ec
DK		 5546}
5547
8f0e8746
TT		 5548static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5549{
5550 const struct quota_format_ops *ops;
5551
5552 if (!sb_has_quota_loaded(sb, qid->type))
5553 return -ESRCH;
5554 ops = sb_dqopt(sb)->ops[qid->type];
5555 if (!ops || !ops->get_next_id)
5556 return -ENOSYS;
5557 return dquot_get_next_id(sb, qid);
5558}
ac27a0ec
DK		 5559#endif
5560
152a0836
AV		 5561static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5562 const char *dev_name, void *data)
ac27a0ec 5563{
152a0836 5564 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5565}
5566
c290ea01 5567#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5568static inline void register_as_ext2(void)
5569{
5570 int err = register_filesystem(&ext2_fs_type);
5571 if (err)
5572 printk(KERN_WARNING
5573 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5574}
5575
5576static inline void unregister_as_ext2(void)
5577{
5578 unregister_filesystem(&ext2_fs_type);
5579}
2035e776
TT		 5580
5581static inline int ext2_feature_set_ok(struct super_block *sb)
5582{
e2b911c5 5583 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5584 return 0;
5585 if (sb->s_flags & MS_RDONLY)
5586 return 1;
e2b911c5 5587 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5588 return 0;
5589 return 1;
5590}
24b58424
TT		 5591#else
5592static inline void register_as_ext2(void) { }
5593static inline void unregister_as_ext2(void) { }
2035e776 5594static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5595#endif
5596
24b58424
TT		 5597static inline void register_as_ext3(void)
5598{
5599 int err = register_filesystem(&ext3_fs_type);
5600 if (err)
5601 printk(KERN_WARNING
5602 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5603}
5604
5605static inline void unregister_as_ext3(void)
5606{
5607 unregister_filesystem(&ext3_fs_type);
5608}
2035e776
TT		 5609
5610static inline int ext3_feature_set_ok(struct super_block *sb)
5611{
e2b911c5 5612 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5613 return 0;
e2b911c5 5614 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5615 return 0;
5616 if (sb->s_flags & MS_RDONLY)
5617 return 1;
e2b911c5 5618 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5619 return 0;
5620 return 1;
5621}
24b58424 5622
03010a33
TT		 5623static struct file_system_type ext4_fs_type = {
5624 .owner = THIS_MODULE,
5625 .name = "ext4",
152a0836 5626 .mount = ext4_mount,
03010a33
TT		 5627 .kill_sb = kill_block_super,
5628 .fs_flags = FS_REQUIRES_DEV,
5629};
7f78e035 5630MODULE_ALIAS_FS("ext4");
03010a33 5631
e9e3bcec
ES		 5632/* Shared across all ext4 file systems */
5633wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5634
5dabfc78 5635static int __init ext4_init_fs(void)
ac27a0ec 5636{
e9e3bcec 5637 int i, err;
c9de560d 5638
e294a537 5639 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5640 ext4_li_info = NULL;
5641 mutex_init(&ext4_li_mtx);
5642
9a4c8019 5643 /* Build-time check for flags consistency */
12e9b892 5644 ext4_check_flag_values();
e9e3bcec 5645
e142d052 5646 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5647 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5648
51865fda 5649 err = ext4_init_es();
6fd058f7
TT		 5650 if (err)
5651 return err;
51865fda
ZL		 5652
5653 err = ext4_init_pageio();
5654 if (err)
b5799018 5655 goto out5;
51865fda 5656
5dabfc78 5657 err = ext4_init_system_zone();
bd2d0210 5658 if (err)
b5799018 5659 goto out4;
857ac889 5660
b5799018 5661 err = ext4_init_sysfs();
dd68314c 5662 if (err)
b5799018 5663 goto out3;
857ac889 5664
5dabfc78 5665 err = ext4_init_mballoc();
c9de560d
AT		 5666 if (err)
5667 goto out2;
ac27a0ec
DK		 5668 err = init_inodecache();
5669 if (err)
5670 goto out1;
24b58424 5671 register_as_ext3();
2035e776 5672 register_as_ext2();
03010a33 5673 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5674 if (err)
5675 goto out;
bfff6873 5676
ac27a0ec
DK		 5677 return 0;
5678out:
24b58424
TT		 5679 unregister_as_ext2();
5680 unregister_as_ext3();
ac27a0ec
DK		 5681 destroy_inodecache();
5682out1:
5dabfc78 5683 ext4_exit_mballoc();
9c191f70 5684out2:
b5799018
TT		 5685 ext4_exit_sysfs();
5686out3:
5dabfc78 5687 ext4_exit_system_zone();
b5799018 5688out4:
5dabfc78 5689 ext4_exit_pageio();
b5799018 5690out5:
51865fda
ZL		 5691 ext4_exit_es();
5692
ac27a0ec
DK		 5693 return err;
5694}
5695
5dabfc78 5696static void __exit ext4_exit_fs(void)
ac27a0ec 5697{
bfff6873 5698 ext4_destroy_lazyinit_thread();
24b58424
TT		 5699 unregister_as_ext2();
5700 unregister_as_ext3();
03010a33 5701 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5702 destroy_inodecache();
5dabfc78 5703 ext4_exit_mballoc();
b5799018 5704 ext4_exit_sysfs();
5dabfc78
TT		 5705 ext4_exit_system_zone();
5706 ext4_exit_pageio();
dd12ed14 5707 ext4_exit_es();
ac27a0ec
DK		 5708}
5709
5710MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5711MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5712MODULE_LICENSE("GPL");
5dabfc78
TT		 5713module_init(ext4_init_fs)
5714module_exit(ext4_exit_fs)
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