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Merge tag 'pwm/for-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
7abc52c2 40#include <linux/cleancache.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
e294a537 58static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 59
617ba13b 60static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 61 unsigned long journal_devnum);
2adf6da8 62static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 63static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 64static void ext4_mark_recovery_complete(struct super_block *sb,
65 struct ext4_super_block *es);
66static void ext4_clear_journal_err(struct super_block *sb,
67 struct ext4_super_block *es);
617ba13b 68static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 69static int ext4_remount(struct super_block *sb, int *flags, char *data);
70static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 71static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 72static int ext4_freeze(struct super_block *sb);
152a0836
AV		 73static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
74 const char *dev_name, void *data);
2035e776
TT		 75static inline int ext2_feature_set_ok(struct super_block *sb);
76static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 77static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 78static void ext4_destroy_lazyinit_thread(void);
79static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 80static void ext4_clear_request_list(void);
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
efbed4dc
TT		 441 if (ext4_error_ratelimit(sb)) {
442 va_start(args, fmt);
443 vaf.fmt = fmt;
444 vaf.va = &args;
445 printk(KERN_CRIT
446 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
447 sb->s_id, function, line, current->comm, &vaf);
448 va_end(args);
449 }
f3fc0210 450 save_error_info(sb, function, line);
617ba13b 451 ext4_handle_error(sb);
ac27a0ec
DK		 452}
453
e7c96e8e
JP		 454void __ext4_error_inode(struct inode *inode, const char *function,
455 unsigned int line, ext4_fsblk_t block,
456 const char *fmt, ...)
273df556
FM		 457{
458 va_list args;
f7c21177 459 struct va_format vaf;
1c13d5c0 460 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 461
1c13d5c0
TT		 462 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
463 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 464 if (ext4_error_ratelimit(inode->i_sb)) {
465 va_start(args, fmt);
466 vaf.fmt = fmt;
467 vaf.va = &args;
468 if (block)
469 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
470 "inode #%lu: block %llu: comm %s: %pV\n",
471 inode->i_sb->s_id, function, line, inode->i_ino,
472 block, current->comm, &vaf);
473 else
474 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
475 "inode #%lu: comm %s: %pV\n",
476 inode->i_sb->s_id, function, line, inode->i_ino,
477 current->comm, &vaf);
478 va_end(args);
479 }
1c13d5c0 480 save_error_info(inode->i_sb, function, line);
273df556
FM		 481 ext4_handle_error(inode->i_sb);
482}
483
e7c96e8e
JP		 484void __ext4_error_file(struct file *file, const char *function,
485 unsigned int line, ext4_fsblk_t block,
486 const char *fmt, ...)
273df556
FM		 487{
488 va_list args;
f7c21177 489 struct va_format vaf;
1c13d5c0 490 struct ext4_super_block *es;
496ad9aa 491 struct inode *inode = file_inode(file);
273df556
FM		 492 char pathname[80], *path;
493
1c13d5c0
TT		 494 es = EXT4_SB(inode->i_sb)->s_es;
495 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 496 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 497 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 498 if (IS_ERR(path))
499 path = "(unknown)";
500 va_start(args, fmt);
501 vaf.fmt = fmt;
502 vaf.va = &args;
503 if (block)
504 printk(KERN_CRIT
505 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
506 "block %llu: comm %s: path %s: %pV\n",
507 inode->i_sb->s_id, function, line, inode->i_ino,
508 block, current->comm, path, &vaf);
509 else
510 printk(KERN_CRIT
511 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
512 "comm %s: path %s: %pV\n",
513 inode->i_sb->s_id, function, line, inode->i_ino,
514 current->comm, path, &vaf);
515 va_end(args);
516 }
1c13d5c0 517 save_error_info(inode->i_sb, function, line);
273df556
FM		 518 ext4_handle_error(inode->i_sb);
519}
520
722887dd
TT		 521const char *ext4_decode_error(struct super_block *sb, int errno,
522 char nbuf[16])
ac27a0ec
DK		 523{
524 char *errstr = NULL;
525
526 switch (errno) {
6a797d27
DW		 527 case -EFSCORRUPTED:
528 errstr = "Corrupt filesystem";
529 break;
530 case -EFSBADCRC:
531 errstr = "Filesystem failed CRC";
532 break;
ac27a0ec
DK		 533 case -EIO:
534 errstr = "IO failure";
535 break;
536 case -ENOMEM:
537 errstr = "Out of memory";
538 break;
539 case -EROFS:
78f1ddbb
TT		 540 if (!sb || (EXT4_SB(sb)->s_journal &&
541 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 542 errstr = "Journal has aborted";
543 else
544 errstr = "Readonly filesystem";
545 break;
546 default:
547 /* If the caller passed in an extra buffer for unknown
548 * errors, textualise them now. Else we just return
549 * NULL. */
550 if (nbuf) {
551 /* Check for truncated error codes... */
552 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
553 errstr = nbuf;
554 }
555 break;
556 }
557
558 return errstr;
559}
560
617ba13b 561/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 562 * automatically and invokes the appropriate error response. */
563
c398eda0
TT		 564void __ext4_std_error(struct super_block *sb, const char *function,
565 unsigned int line, int errno)
ac27a0ec
DK		 566{
567 char nbuf[16];
568 const char *errstr;
569
570 /* Special case: if the error is EROFS, and we're not already
571 * inside a transaction, then there's really no point in logging
572 * an error. */
573 if (errno == -EROFS && journal_current_handle() == NULL &&
574 (sb->s_flags & MS_RDONLY))
575 return;
576
efbed4dc
TT		 577 if (ext4_error_ratelimit(sb)) {
578 errstr = ext4_decode_error(sb, errno, nbuf);
579 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
580 sb->s_id, function, line, errstr);
581 }
ac27a0ec 582
efbed4dc 583 save_error_info(sb, function, line);
617ba13b 584 ext4_handle_error(sb);
ac27a0ec
DK		 585}
586
587/*
617ba13b 588 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 589 * abort function may be used to deal with unrecoverable failures such
590 * as journal IO errors or ENOMEM at a critical moment in log management.
591 *
592 * We unconditionally force the filesystem into an ABORT|READONLY state,
593 * unless the error response on the fs has been set to panic in which
594 * case we take the easy way out and panic immediately.
595 */
596
c67d859e 597void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 598 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 599{
600 va_list args;
601
1c13d5c0 602 save_error_info(sb, function, line);
ac27a0ec 603 va_start(args, fmt);
c398eda0
TT		 604 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
605 function, line);
ac27a0ec
DK		 606 vprintk(fmt, args);
607 printk("\n");
608 va_end(args);
609
1c13d5c0
TT		 610 if ((sb->s_flags & MS_RDONLY) == 0) {
611 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 612 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 613 /*
614 * Make sure updated value of ->s_mount_flags will be visible
615 * before ->s_flags update
616 */
617 smp_wmb();
618 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 619 if (EXT4_SB(sb)->s_journal)
620 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
621 save_error_info(sb, function, line);
622 }
4327ba52
DJ		 623 if (test_opt(sb, ERRORS_PANIC)) {
624 if (EXT4_SB(sb)->s_journal &&
625 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
626 return;
617ba13b 627 panic("EXT4-fs panic from previous error\n");
4327ba52 628 }
ac27a0ec
DK		 629}
630
e7c96e8e
JP		 631void __ext4_msg(struct super_block *sb,
632 const char *prefix, const char *fmt, ...)
b31e1552 633{
0ff2ea7d 634 struct va_format vaf;
b31e1552
ES		 635 va_list args;
636
efbed4dc
TT		 637 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
638 return;
639
b31e1552 640 va_start(args, fmt);
0ff2ea7d
JP		 641 vaf.fmt = fmt;
642 vaf.va = &args;
643 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 644 va_end(args);
645}
646
b03a2f7e
AD		 647#define ext4_warning_ratelimit(sb) \
648 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
649 "EXT4-fs warning")
650
12062ddd 651void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 652 unsigned int line, const char *fmt, ...)
ac27a0ec 653{
0ff2ea7d 654 struct va_format vaf;
ac27a0ec
DK		 655 va_list args;
656
b03a2f7e 657 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 658 return;
659
ac27a0ec 660 va_start(args, fmt);
0ff2ea7d
JP		 661 vaf.fmt = fmt;
662 vaf.va = &args;
663 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
664 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 665 va_end(args);
666}
667
b03a2f7e
AD		 668void __ext4_warning_inode(const struct inode *inode, const char *function,
669 unsigned int line, const char *fmt, ...)
670{
671 struct va_format vaf;
672 va_list args;
673
674 if (!ext4_warning_ratelimit(inode->i_sb))
675 return;
676
677 va_start(args, fmt);
678 vaf.fmt = fmt;
679 vaf.va = &args;
680 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
681 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
682 function, line, inode->i_ino, current->comm, &vaf);
683 va_end(args);
684}
685
e29136f8
TT		 686void __ext4_grp_locked_error(const char *function, unsigned int line,
687 struct super_block *sb, ext4_group_t grp,
688 unsigned long ino, ext4_fsblk_t block,
689 const char *fmt, ...)
5d1b1b3f
AK		 690__releases(bitlock)
691__acquires(bitlock)
692{
0ff2ea7d 693 struct va_format vaf;
5d1b1b3f
AK		 694 va_list args;
695 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
696
1c13d5c0
TT		 697 es->s_last_error_ino = cpu_to_le32(ino);
698 es->s_last_error_block = cpu_to_le64(block);
699 __save_error_info(sb, function, line);
0ff2ea7d 700
efbed4dc
TT		 701 if (ext4_error_ratelimit(sb)) {
702 va_start(args, fmt);
703 vaf.fmt = fmt;
704 vaf.va = &args;
705 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
706 sb->s_id, function, line, grp);
707 if (ino)
708 printk(KERN_CONT "inode %lu: ", ino);
709 if (block)
710 printk(KERN_CONT "block %llu:",
711 (unsigned long long) block);
712 printk(KERN_CONT "%pV\n", &vaf);
713 va_end(args);
714 }
5d1b1b3f
AK		 715
716 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 717 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 718 return;
719 }
1c13d5c0 720
5d1b1b3f
AK		 721 ext4_unlock_group(sb, grp);
722 ext4_handle_error(sb);
723 /*
724 * We only get here in the ERRORS_RO case; relocking the group
725 * may be dangerous, but nothing bad will happen since the
726 * filesystem will have already been marked read/only and the
727 * journal has been aborted. We return 1 as a hint to callers
728 * who might what to use the return value from
25985edc 729 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 730 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
731 * aggressively from the ext4 function in question, with a
732 * more appropriate error code.
733 */
734 ext4_lock_group(sb, grp);
735 return;
736}
737
617ba13b 738void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 739{
617ba13b 740 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 741
617ba13b 742 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 743 return;
744
12062ddd 745 ext4_warning(sb,
ac27a0ec
DK		 746 "updating to rev %d because of new feature flag, "
747 "running e2fsck is recommended",
617ba13b 748 EXT4_DYNAMIC_REV);
ac27a0ec 749
617ba13b
MC		 750 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
751 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
752 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 753 /* leave es->s_feature_*compat flags alone */
754 /* es->s_uuid will be set by e2fsck if empty */
755
756 /*
757 * The rest of the superblock fields should be zero, and if not it
758 * means they are likely already in use, so leave them alone. We
759 * can leave it up to e2fsck to clean up any inconsistencies there.
760 */
761}
762
763/*
764 * Open the external journal device
765 */
b31e1552 766static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 767{
768 struct block_device *bdev;
769 char b[BDEVNAME_SIZE];
770
d4d77629 771 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 772 if (IS_ERR(bdev))
773 goto fail;
774 return bdev;
775
776fail:
b31e1552 777 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 778 __bdevname(dev, b), PTR_ERR(bdev));
779 return NULL;
780}
781
782/*
783 * Release the journal device
784 */
4385bab1 785static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 786{
4385bab1 787 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 788}
789
4385bab1 790static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 791{
792 struct block_device *bdev;
ac27a0ec
DK		 793 bdev = sbi->journal_bdev;
794 if (bdev) {
4385bab1 795 ext4_blkdev_put(bdev);
ac27a0ec
DK		 796 sbi->journal_bdev = NULL;
797 }
ac27a0ec
DK		 798}
799
800static inline struct inode *orphan_list_entry(struct list_head *l)
801{
617ba13b 802 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 803}
804
617ba13b 805static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 806{
807 struct list_head *l;
808
b31e1552
ES		 809 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
810 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 811
812 printk(KERN_ERR "sb_info orphan list:\n");
813 list_for_each(l, &sbi->s_orphan) {
814 struct inode *inode = orphan_list_entry(l);
815 printk(KERN_ERR " "
816 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
817 inode->i_sb->s_id, inode->i_ino, inode,
818 inode->i_mode, inode->i_nlink,
819 NEXT_ORPHAN(inode));
820 }
821}
822
2b2d6d01 823static void ext4_put_super(struct super_block *sb)
ac27a0ec 824{
617ba13b
MC		 825 struct ext4_sb_info *sbi = EXT4_SB(sb);
826 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 827 int i, err;
ac27a0ec 828
857ac889 829 ext4_unregister_li_request(sb);
e0ccfd95
CH		 830 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
831
2e8fa54e 832 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 833 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 834
0390131b
FM		 835 if (sbi->s_journal) {
836 err = jbd2_journal_destroy(sbi->s_journal);
837 sbi->s_journal = NULL;
838 if (err < 0)
c67d859e 839 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 840 }
d4edac31 841
ebd173be 842 ext4_unregister_sysfs(sb);
d3922a77 843 ext4_es_unregister_shrinker(sbi);
9105bb14 844 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 845 ext4_release_system_zone(sb);
846 ext4_mb_release(sb);
847 ext4_ext_release(sb);
d4edac31 848
ac27a0ec 849 if (!(sb->s_flags & MS_RDONLY)) {
e2b911c5 850 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 851 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 852 }
58c5873a 853 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 854 ext4_commit_super(sb, 1);
855
ac27a0ec
DK		 856 for (i = 0; i < sbi->s_gdb_count; i++)
857 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 858 kvfree(sbi->s_group_desc);
859 kvfree(sbi->s_flex_groups);
57042651 860 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 861 percpu_counter_destroy(&sbi->s_freeinodes_counter);
862 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 863 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 864 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec
DK		 865 brelse(sbi->s_sbh);
866#ifdef CONFIG_QUOTA
a2d4a646 867 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 868 kfree(sbi->s_qf_names[i]);
869#endif
870
871 /* Debugging code just in case the in-memory inode orphan list
872 * isn't empty. The on-disk one can be non-empty if we've
873 * detected an error and taken the fs readonly, but the
874 * in-memory list had better be clean by this point. */
875 if (!list_empty(&sbi->s_orphan))
876 dump_orphan_list(sb, sbi);
877 J_ASSERT(list_empty(&sbi->s_orphan));
878
89d96a6f 879 sync_blockdev(sb->s_bdev);
f98393a6 880 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 881 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
882 /*
883 * Invalidate the journal device's buffers. We don't want them
884 * floating about in memory - the physical journal device may
885 * hotswapped, and it breaks the `ro-after' testing code.
886 */
887 sync_blockdev(sbi->journal_bdev);
f98393a6 888 invalidate_bdev(sbi->journal_bdev);
617ba13b 889 ext4_blkdev_remove(sbi);
ac27a0ec 890 }
9c191f70
M		 891 if (sbi->s_mb_cache) {
892 ext4_xattr_destroy_cache(sbi->s_mb_cache);
893 sbi->s_mb_cache = NULL;
894 }
c5e06d10
JL		 895 if (sbi->s_mmp_tsk)
896 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 897 sb->s_fs_info = NULL;
3197ebdb
TT		 898 /*
899 * Now that we are completely done shutting down the
900 * superblock, we need to actually destroy the kobject.
901 */
3197ebdb
TT		 902 kobject_put(&sbi->s_kobj);
903 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 904 if (sbi->s_chksum_driver)
905 crypto_free_shash(sbi->s_chksum_driver);
705895b6 906 kfree(sbi->s_blockgroup_lock);
ac27a0ec 907 kfree(sbi);
ac27a0ec
DK		 908}
909
e18b890b 910static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 911
912/*
913 * Called inside transaction, so use GFP_NOFS
914 */
617ba13b 915static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 916{
617ba13b 917 struct ext4_inode_info *ei;
ac27a0ec 918
e6b4f8da 919 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 920 if (!ei)
921 return NULL;
0b8e58a1 922
ac27a0ec 923 ei->vfs_inode.i_version = 1;
202ee5df 924 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 925 INIT_LIST_HEAD(&ei->i_prealloc_list);
926 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 927 ext4_es_init_tree(&ei->i_es_tree);
928 rwlock_init(&ei->i_es_lock);
edaa53ca 929 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 930 ei->i_es_all_nr = 0;
edaa53ca 931 ei->i_es_shk_nr = 0;
dd475925 932 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 933 ei->i_reserved_data_blocks = 0;
934 ei->i_reserved_meta_blocks = 0;
935 ei->i_allocated_meta_blocks = 0;
9d0be502 936 ei->i_da_metadata_calc_len = 0;
7e731bc9 937 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 938 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 939#ifdef CONFIG_QUOTA
940 ei->i_reserved_quota = 0;
96c7e0d9 941 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 942#endif
8aefcd55 943 ei->jinode = NULL;
2e8fa54e 944 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 945 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 946 ei->i_sync_tid = 0;
947 ei->i_datasync_tid = 0;
e27f41e1 948 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 949 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 950 return &ei->vfs_inode;
951}
952
7ff9c073
TT		 953static int ext4_drop_inode(struct inode *inode)
954{
955 int drop = generic_drop_inode(inode);
956
957 trace_ext4_drop_inode(inode, drop);
958 return drop;
959}
960
fa0d7e3d
NP		 961static void ext4_i_callback(struct rcu_head *head)
962{
963 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 964 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
965}
966
617ba13b 967static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 968{
9f7dd93d 969 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 970 ext4_msg(inode->i_sb, KERN_ERR,
971 "Inode %lu (%p): orphan list check failed!",
972 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 973 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
974 EXT4_I(inode), sizeof(struct ext4_inode_info),
975 true);
976 dump_stack();
977 }
fa0d7e3d 978 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 979}
980
51cc5068 981static void init_once(void *foo)
ac27a0ec 982{
617ba13b 983 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 984
a35afb83 985 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 986 init_rwsem(&ei->xattr_sem);
0e855ac8 987 init_rwsem(&ei->i_data_sem);
ea3d7209 988 init_rwsem(&ei->i_mmap_sem);
a35afb83 989 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 990}
991
e67bc2b3 992static int __init init_inodecache(void)
ac27a0ec 993{
617ba13b
MC		 994 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
995 sizeof(struct ext4_inode_info),
ac27a0ec 996 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 997 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 998 init_once);
617ba13b 999 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1000 return -ENOMEM;
1001 return 0;
1002}
1003
1004static void destroy_inodecache(void)
1005{
8c0a8537
KS		 1006 /*
1007 * Make sure all delayed rcu free inodes are flushed before we
1008 * destroy cache.
1009 */
1010 rcu_barrier();
617ba13b 1011 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1012}
1013
0930fcc1 1014void ext4_clear_inode(struct inode *inode)
ac27a0ec 1015{
0930fcc1 1016 invalidate_inode_buffers(inode);
dbd5768f 1017 clear_inode(inode);
9f754758 1018 dquot_drop(inode);
c2ea3fde 1019 ext4_discard_preallocations(inode);
51865fda 1020 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1021 if (EXT4_I(inode)->jinode) {
1022 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1023 EXT4_I(inode)->jinode);
1024 jbd2_free_inode(EXT4_I(inode)->jinode);
1025 EXT4_I(inode)->jinode = NULL;
1026 }
b7236e21 1027#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 1028 fscrypt_put_encryption_info(inode, NULL);
b7236e21 1029#endif
ac27a0ec
DK		 1030}
1031
1b961ac0 1032static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1033 u64 ino, u32 generation)
ac27a0ec 1034{
ac27a0ec 1035 struct inode *inode;
ac27a0ec 1036
617ba13b 1037 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1038 return ERR_PTR(-ESTALE);
617ba13b 1039 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1040 return ERR_PTR(-ESTALE);
1041
1042 /* iget isn't really right if the inode is currently unallocated!!
1043 *
617ba13b 1044 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1045 * deleted, so we should be safe.
1046 *
1047 * Currently we don't know the generation for parent directory, so
1048 * a generation of 0 means "accept any"
1049 */
f4bb2981 1050 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1051 if (IS_ERR(inode))
1052 return ERR_CAST(inode);
1053 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1054 iput(inode);
1055 return ERR_PTR(-ESTALE);
1056 }
1b961ac0
CH		 1057
1058 return inode;
1059}
1060
1061static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1062 int fh_len, int fh_type)
1b961ac0
CH		 1063{
1064 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1065 ext4_nfs_get_inode);
1066}
1067
1068static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1069 int fh_len, int fh_type)
1b961ac0
CH		 1070{
1071 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1072 ext4_nfs_get_inode);
ac27a0ec
DK		 1073}
1074
c39a7f84
TO		 1075/*
1076 * Try to release metadata pages (indirect blocks, directories) which are
1077 * mapped via the block device. Since these pages could have journal heads
1078 * which would prevent try_to_free_buffers() from freeing them, we must use
1079 * jbd2 layer's try_to_free_buffers() function to release them.
1080 */
0b8e58a1
AD		 1081static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1082 gfp_t wait)
c39a7f84
TO		 1083{
1084 journal_t *journal = EXT4_SB(sb)->s_journal;
1085
1086 WARN_ON(PageChecked(page));
1087 if (!page_has_buffers(page))
1088 return 0;
1089 if (journal)
1090 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1091 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1092 return try_to_free_buffers(page);
1093}
1094
a7550b30
JK		 1095#ifdef CONFIG_EXT4_FS_ENCRYPTION
1096static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1097{
1098 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1099 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1100}
1101
1102static int ext4_key_prefix(struct inode *inode, u8 **key)
1103{
1104 *key = EXT4_SB(inode->i_sb)->key_prefix;
1105 return EXT4_SB(inode->i_sb)->key_prefix_size;
1106}
1107
1108static int ext4_prepare_context(struct inode *inode)
1109{
1110 return ext4_convert_inline_data(inode);
1111}
1112
1113static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1114 void *fs_data)
1115{
1116 handle_t *handle;
1117 int res, res2;
1118
1119 /* fs_data is null when internally used. */
1120 if (fs_data) {
1121 res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1122 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
1123 len, 0);
1124 if (!res) {
1125 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1126 ext4_clear_inode_state(inode,
1127 EXT4_STATE_MAY_INLINE_DATA);
1128 }
1129 return res;
1130 }
1131
1132 handle = ext4_journal_start(inode, EXT4_HT_MISC,
1133 ext4_jbd2_credits_xattr(inode));
1134 if (IS_ERR(handle))
1135 return PTR_ERR(handle);
1136
1137 res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1138 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
1139 len, 0);
1140 if (!res) {
1141 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1142 res = ext4_mark_inode_dirty(handle, inode);
1143 if (res)
1144 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1145 }
1146 res2 = ext4_journal_stop(handle);
1147 if (!res)
1148 res = res2;
1149 return res;
1150}
1151
1152static int ext4_dummy_context(struct inode *inode)
1153{
1154 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1155}
1156
1157static unsigned ext4_max_namelen(struct inode *inode)
1158{
1159 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1160 EXT4_NAME_LEN;
1161}
1162
1163static struct fscrypt_operations ext4_cryptops = {
1164 .get_context = ext4_get_context,
1165 .key_prefix = ext4_key_prefix,
1166 .prepare_context = ext4_prepare_context,
1167 .set_context = ext4_set_context,
1168 .dummy_context = ext4_dummy_context,
1169 .is_encrypted = ext4_encrypted_inode,
1170 .empty_dir = ext4_empty_dir,
1171 .max_namelen = ext4_max_namelen,
1172};
1173#else
1174static struct fscrypt_operations ext4_cryptops = {
1175 .is_encrypted = ext4_encrypted_inode,
1176};
1177#endif
1178
ac27a0ec 1179#ifdef CONFIG_QUOTA
689c958c
LX		 1180static char *quotatypes[] = INITQFNAMES;
1181#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1182
617ba13b
MC		 1183static int ext4_write_dquot(struct dquot *dquot);
1184static int ext4_acquire_dquot(struct dquot *dquot);
1185static int ext4_release_dquot(struct dquot *dquot);
1186static int ext4_mark_dquot_dirty(struct dquot *dquot);
1187static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1188static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1189 struct path *path);
ca0e05e4 1190static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1191static int ext4_quota_on_mount(struct super_block *sb, int type);
1192static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1193 size_t len, loff_t off);
617ba13b 1194static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1195 const char *data, size_t len, loff_t off);
7c319d32
AK		 1196static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1197 unsigned int flags);
1198static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1199static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1200
96c7e0d9
JK		 1201static struct dquot **ext4_get_dquots(struct inode *inode)
1202{
1203 return EXT4_I(inode)->i_dquot;
1204}
1205
61e225dc 1206static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1207 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1208 .write_dquot = ext4_write_dquot,
1209 .acquire_dquot = ext4_acquire_dquot,
1210 .release_dquot = ext4_release_dquot,
1211 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1212 .write_info = ext4_write_info,
1213 .alloc_dquot = dquot_alloc,
1214 .destroy_dquot = dquot_destroy,
040cb378 1215 .get_projid = ext4_get_projid,
8f0e8746 1216 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1217};
1218
0d54b217 1219static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1220 .quota_on = ext4_quota_on,
ca0e05e4 1221 .quota_off = ext4_quota_off,
287a8095 1222 .quota_sync = dquot_quota_sync,
0a240339 1223 .get_state = dquot_get_state,
287a8095
CH		 1224 .set_info = dquot_set_dqinfo,
1225 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1226 .set_dqblk = dquot_set_dqblk,
1227 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1228};
1229#endif
1230
ee9b6d61 1231static const struct super_operations ext4_sops = {
617ba13b
MC		 1232 .alloc_inode = ext4_alloc_inode,
1233 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1234 .write_inode = ext4_write_inode,
1235 .dirty_inode = ext4_dirty_inode,
7ff9c073 1236 .drop_inode = ext4_drop_inode,
0930fcc1 1237 .evict_inode = ext4_evict_inode,
617ba13b 1238 .put_super = ext4_put_super,
617ba13b 1239 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1240 .freeze_fs = ext4_freeze,
1241 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1242 .statfs = ext4_statfs,
1243 .remount_fs = ext4_remount,
617ba13b 1244 .show_options = ext4_show_options,
ac27a0ec 1245#ifdef CONFIG_QUOTA
617ba13b
MC		 1246 .quota_read = ext4_quota_read,
1247 .quota_write = ext4_quota_write,
96c7e0d9 1248 .get_dquots = ext4_get_dquots,
ac27a0ec 1249#endif
c39a7f84 1250 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1251};
1252
39655164 1253static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1254 .fh_to_dentry = ext4_fh_to_dentry,
1255 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1256 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1257};
1258
1259enum {
1260 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1261 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1262 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1263 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1264 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1265 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1266 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1267 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1268 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1269 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1270 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1271 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1272 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1449032b 1273 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1274 Opt_lazytime, Opt_nolazytime,
1449032b 1275 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1276 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1277 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1278 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1279 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1280};
1281
a447c093 1282static const match_table_t tokens = {
ac27a0ec
DK		 1283 {Opt_bsd_df, "bsddf"},
1284 {Opt_minix_df, "minixdf"},
1285 {Opt_grpid, "grpid"},
1286 {Opt_grpid, "bsdgroups"},
1287 {Opt_nogrpid, "nogrpid"},
1288 {Opt_nogrpid, "sysvgroups"},
1289 {Opt_resgid, "resgid=%u"},
1290 {Opt_resuid, "resuid=%u"},
1291 {Opt_sb, "sb=%u"},
1292 {Opt_err_cont, "errors=continue"},
1293 {Opt_err_panic, "errors=panic"},
1294 {Opt_err_ro, "errors=remount-ro"},
1295 {Opt_nouid32, "nouid32"},
ac27a0ec 1296 {Opt_debug, "debug"},
72578c33
TT		 1297 {Opt_removed, "oldalloc"},
1298 {Opt_removed, "orlov"},
ac27a0ec
DK		 1299 {Opt_user_xattr, "user_xattr"},
1300 {Opt_nouser_xattr, "nouser_xattr"},
1301 {Opt_acl, "acl"},
1302 {Opt_noacl, "noacl"},
e3bb52ae 1303 {Opt_noload, "norecovery"},
5a916be1 1304 {Opt_noload, "noload"},
72578c33
TT		 1305 {Opt_removed, "nobh"},
1306 {Opt_removed, "bh"},
ac27a0ec 1307 {Opt_commit, "commit=%u"},
30773840
TT		 1308 {Opt_min_batch_time, "min_batch_time=%u"},
1309 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1310 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1311 {Opt_journal_path, "journal_path=%s"},
818d276c 1312 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1313 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1314 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1315 {Opt_abort, "abort"},
1316 {Opt_data_journal, "data=journal"},
1317 {Opt_data_ordered, "data=ordered"},
1318 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1319 {Opt_data_err_abort, "data_err=abort"},
1320 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1321 {Opt_offusrjquota, "usrjquota="},
1322 {Opt_usrjquota, "usrjquota=%s"},
1323 {Opt_offgrpjquota, "grpjquota="},
1324 {Opt_grpjquota, "grpjquota=%s"},
1325 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1326 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1327 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1328 {Opt_grpquota, "grpquota"},
1329 {Opt_noquota, "noquota"},
1330 {Opt_quota, "quota"},
1331 {Opt_usrquota, "usrquota"},
49da9392 1332 {Opt_prjquota, "prjquota"},
ac27a0ec 1333 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1334 {Opt_barrier, "barrier"},
1335 {Opt_nobarrier, "nobarrier"},
25ec56b5 1336 {Opt_i_version, "i_version"},
923ae0ff 1337 {Opt_dax, "dax"},
c9de560d 1338 {Opt_stripe, "stripe=%u"},
64769240 1339 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1340 {Opt_lazytime, "lazytime"},
1341 {Opt_nolazytime, "nolazytime"},
dd919b98 1342 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1343 {Opt_removed, "mblk_io_submit"},
1344 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1345 {Opt_block_validity, "block_validity"},
1346 {Opt_noblock_validity, "noblock_validity"},
240799cd 1347 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1348 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1349 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1350 {Opt_auto_da_alloc, "auto_da_alloc"},
1351 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1352 {Opt_dioread_nolock, "dioread_nolock"},
1353 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1354 {Opt_discard, "discard"},
1355 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1356 {Opt_init_itable, "init_itable=%u"},
1357 {Opt_init_itable, "init_itable"},
1358 {Opt_noinit_itable, "noinit_itable"},
df981d03 1359 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1360 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1361 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1362 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1363 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1364 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1365 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1366 {Opt_err, NULL},
ac27a0ec
DK		 1367};
1368
617ba13b 1369static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1370{
617ba13b 1371 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1372 char *options = (char *) *data;
1373
1374 if (!options || strncmp(options, "sb=", 3) != 0)
1375 return 1; /* Default location */
0b8e58a1 1376
ac27a0ec 1377 options += 3;
0b8e58a1 1378 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1379 sb_block = simple_strtoul(options, &options, 0);
1380 if (*options && *options != ',') {
4776004f 1381 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1382 (char *) *data);
1383 return 1;
1384 }
1385 if (*options == ',')
1386 options++;
1387 *data = (void *) options;
0b8e58a1 1388
ac27a0ec
DK		 1389 return sb_block;
1390}
1391
b3881f74 1392#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1393static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1394 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1395
56c50f11
DM		 1396#ifdef CONFIG_QUOTA
1397static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1398{
1399 struct ext4_sb_info *sbi = EXT4_SB(sb);
1400 char *qname;
03dafb5f 1401 int ret = -1;
56c50f11
DM		 1402
1403 if (sb_any_quota_loaded(sb) &&
1404 !sbi->s_qf_names[qtype]) {
1405 ext4_msg(sb, KERN_ERR,
1406 "Cannot change journaled "
1407 "quota options when quota turned on");
57f73c2c 1408 return -1;
56c50f11 1409 }
e2b911c5 1410 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1411 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1412 "ignored when QUOTA feature is enabled");
1413 return 1;
262b4662 1414 }
56c50f11
DM		 1415 qname = match_strdup(args);
1416 if (!qname) {
1417 ext4_msg(sb, KERN_ERR,
1418 "Not enough memory for storing quotafile name");
57f73c2c 1419 return -1;
56c50f11 1420 }
03dafb5f
CG		 1421 if (sbi->s_qf_names[qtype]) {
1422 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1423 ret = 1;
1424 else
1425 ext4_msg(sb, KERN_ERR,
1426 "%s quota file already specified",
1427 QTYPE2NAME(qtype));
1428 goto errout;
56c50f11 1429 }
03dafb5f 1430 if (strchr(qname, '/')) {
56c50f11
DM		 1431 ext4_msg(sb, KERN_ERR,
1432 "quotafile must be on filesystem root");
03dafb5f 1433 goto errout;
56c50f11 1434 }
03dafb5f 1435 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1436 set_opt(sb, QUOTA);
56c50f11 1437 return 1;
03dafb5f
CG		 1438errout:
1439 kfree(qname);
1440 return ret;
56c50f11
DM		 1441}
1442
1443static int clear_qf_name(struct super_block *sb, int qtype)
1444{
1445
1446 struct ext4_sb_info *sbi = EXT4_SB(sb);
1447
1448 if (sb_any_quota_loaded(sb) &&
1449 sbi->s_qf_names[qtype]) {
1450 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1451 " when quota turned on");
57f73c2c 1452 return -1;
56c50f11 1453 }
03dafb5f 1454 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1455 sbi->s_qf_names[qtype] = NULL;
1456 return 1;
1457}
1458#endif
1459
26092bf5
TT		 1460#define MOPT_SET 0x0001
1461#define MOPT_CLEAR 0x0002
1462#define MOPT_NOSUPPORT 0x0004
1463#define MOPT_EXPLICIT 0x0008
1464#define MOPT_CLEAR_ERR 0x0010
1465#define MOPT_GTE0 0x0020
ac27a0ec 1466#ifdef CONFIG_QUOTA
26092bf5
TT		 1467#define MOPT_Q 0
1468#define MOPT_QFMT 0x0040
1469#else
1470#define MOPT_Q MOPT_NOSUPPORT
1471#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1472#endif
26092bf5 1473#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1474#define MOPT_NO_EXT2 0x0100
1475#define MOPT_NO_EXT3 0x0200
1476#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1477#define MOPT_STRING 0x0400
26092bf5
TT		 1478
1479static const struct mount_opts {
1480 int token;
1481 int mount_opt;
1482 int flags;
1483} ext4_mount_opts[] = {
1484 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1485 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1486 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1487 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1488 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1489 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1490 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1491 MOPT_EXT4_ONLY | MOPT_SET},
1492 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1493 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1494 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1495 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1496 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1497 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1498 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1499 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1500 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1501 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1502 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1503 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1504 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1505 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1506 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1507 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1508 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1509 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1510 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1511 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1512 MOPT_NO_EXT2},
8dc0aa8c 1513 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1514 MOPT_NO_EXT2},
26092bf5
TT		 1515 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1516 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1517 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1518 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1519 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1520 {Opt_commit, 0, MOPT_GTE0},
1521 {Opt_max_batch_time, 0, MOPT_GTE0},
1522 {Opt_min_batch_time, 0, MOPT_GTE0},
1523 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1524 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1525 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1526 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1527 {Opt_resuid, 0, MOPT_GTE0},
1528 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1529 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1530 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1531 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1532 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1533 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1534 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1535 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1536 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1537 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1538#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1539 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1540 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1541#else
26092bf5
TT		 1542 {Opt_acl, 0, MOPT_NOSUPPORT},
1543 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1544#endif
26092bf5
TT		 1545 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1546 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1547 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1548 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1549 MOPT_SET | MOPT_Q},
1550 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1551 MOPT_SET | MOPT_Q},
49da9392
JK		 1552 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1553 MOPT_SET | MOPT_Q},
26092bf5 1554 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1555 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1556 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1557 {Opt_usrjquota, 0, MOPT_Q},
1558 {Opt_grpjquota, 0, MOPT_Q},
1559 {Opt_offusrjquota, 0, MOPT_Q},
1560 {Opt_offgrpjquota, 0, MOPT_Q},
1561 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1562 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1563 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1564 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1565 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1566 {Opt_err, 0, 0}
1567};
1568
1569static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1570 substring_t *args, unsigned long *journal_devnum,
1571 unsigned int *journal_ioprio, int is_remount)
1572{
1573 struct ext4_sb_info *sbi = EXT4_SB(sb);
1574 const struct mount_opts *m;
08cefc7a
EB		 1575 kuid_t uid;
1576 kgid_t gid;
26092bf5
TT		 1577 int arg = 0;
1578
57f73c2c
TT		 1579#ifdef CONFIG_QUOTA
1580 if (token == Opt_usrjquota)
1581 return set_qf_name(sb, USRQUOTA, &args[0]);
1582 else if (token == Opt_grpjquota)
1583 return set_qf_name(sb, GRPQUOTA, &args[0]);
1584 else if (token == Opt_offusrjquota)
1585 return clear_qf_name(sb, USRQUOTA);
1586 else if (token == Opt_offgrpjquota)
1587 return clear_qf_name(sb, GRPQUOTA);
1588#endif
26092bf5 1589 switch (token) {
f7048605
TT		 1590 case Opt_noacl:
1591 case Opt_nouser_xattr:
1592 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1593 break;
26092bf5
TT		 1594 case Opt_sb:
1595 return 1; /* handled by get_sb_block() */
1596 case Opt_removed:
5f3633e3 1597 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1598 return 1;
26092bf5
TT		 1599 case Opt_abort:
1600 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1601 return 1;
1602 case Opt_i_version:
1603 sb->s_flags |= MS_I_VERSION;
1604 return 1;
a26f4992
TT		 1605 case Opt_lazytime:
1606 sb->s_flags |= MS_LAZYTIME;
1607 return 1;
1608 case Opt_nolazytime:
1609 sb->s_flags &= ~MS_LAZYTIME;
1610 return 1;
26092bf5
TT		 1611 }
1612
5f3633e3
JK		 1613 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1614 if (token == m->token)
1615 break;
1616
1617 if (m->token == Opt_err) {
1618 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1619 "or missing value", opt);
1620 return -1;
1621 }
1622
8dc0aa8c
TT		 1623 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1624 ext4_msg(sb, KERN_ERR,
1625 "Mount option \"%s\" incompatible with ext2", opt);
1626 return -1;
1627 }
1628 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1629 ext4_msg(sb, KERN_ERR,
1630 "Mount option \"%s\" incompatible with ext3", opt);
1631 return -1;
1632 }
1633
ad4eec61 1634 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1635 return -1;
1636 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1637 return -1;
c93cf2d7
DM		 1638 if (m->flags & MOPT_EXPLICIT) {
1639 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1640 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1641 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1642 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1643 } else
1644 return -1;
1645 }
5f3633e3
JK		 1646 if (m->flags & MOPT_CLEAR_ERR)
1647 clear_opt(sb, ERRORS_MASK);
1648 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1649 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1650 "options when quota turned on");
1651 return -1;
1652 }
1653
1654 if (m->flags & MOPT_NOSUPPORT) {
1655 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1656 } else if (token == Opt_commit) {
1657 if (arg == 0)
1658 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1659 sbi->s_commit_interval = HZ * arg;
1660 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1661 sbi->s_max_batch_time = arg;
1662 } else if (token == Opt_min_batch_time) {
1663 sbi->s_min_batch_time = arg;
1664 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1665 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1666 ext4_msg(sb, KERN_ERR,
1667 "EXT4-fs: inode_readahead_blks must be "
1668 "0 or a power of 2 smaller than 2^31");
26092bf5 1669 return -1;
5f3633e3
JK		 1670 }
1671 sbi->s_inode_readahead_blks = arg;
1672 } else if (token == Opt_init_itable) {
1673 set_opt(sb, INIT_INODE_TABLE);
1674 if (!args->from)
1675 arg = EXT4_DEF_LI_WAIT_MULT;
1676 sbi->s_li_wait_mult = arg;
1677 } else if (token == Opt_max_dir_size_kb) {
1678 sbi->s_max_dir_size_kb = arg;
1679 } else if (token == Opt_stripe) {
1680 sbi->s_stripe = arg;
1681 } else if (token == Opt_resuid) {
1682 uid = make_kuid(current_user_ns(), arg);
1683 if (!uid_valid(uid)) {
1684 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1685 return -1;
1686 }
5f3633e3
JK		 1687 sbi->s_resuid = uid;
1688 } else if (token == Opt_resgid) {
1689 gid = make_kgid(current_user_ns(), arg);
1690 if (!gid_valid(gid)) {
1691 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1692 return -1;
1693 }
1694 sbi->s_resgid = gid;
1695 } else if (token == Opt_journal_dev) {
1696 if (is_remount) {
1697 ext4_msg(sb, KERN_ERR,
1698 "Cannot specify journal on remount");
1699 return -1;
1700 }
1701 *journal_devnum = arg;
ad4eec61
ES		 1702 } else if (token == Opt_journal_path) {
1703 char *journal_path;
1704 struct inode *journal_inode;
1705 struct path path;
1706 int error;
1707
1708 if (is_remount) {
1709 ext4_msg(sb, KERN_ERR,
1710 "Cannot specify journal on remount");
1711 return -1;
1712 }
1713 journal_path = match_strdup(&args[0]);
1714 if (!journal_path) {
1715 ext4_msg(sb, KERN_ERR, "error: could not dup "
1716 "journal device string");
1717 return -1;
1718 }
1719
1720 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1721 if (error) {
1722 ext4_msg(sb, KERN_ERR, "error: could not find "
1723 "journal device path: error %d", error);
1724 kfree(journal_path);
1725 return -1;
1726 }
1727
2b0143b5 1728 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1729 if (!S_ISBLK(journal_inode->i_mode)) {
1730 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1731 "is not a block device", journal_path);
1732 path_put(&path);
1733 kfree(journal_path);
1734 return -1;
1735 }
1736
1737 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1738 path_put(&path);
1739 kfree(journal_path);
5f3633e3
JK		 1740 } else if (token == Opt_journal_ioprio) {
1741 if (arg > 7) {
1742 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1743 " (must be 0-7)");
1744 return -1;
1745 }
1746 *journal_ioprio =
1747 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1748 } else if (token == Opt_test_dummy_encryption) {
1749#ifdef CONFIG_EXT4_FS_ENCRYPTION
1750 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1751 ext4_msg(sb, KERN_WARNING,
1752 "Test dummy encryption mode enabled");
1753#else
1754 ext4_msg(sb, KERN_WARNING,
1755 "Test dummy encryption mount option ignored");
1756#endif
5f3633e3
JK		 1757 } else if (m->flags & MOPT_DATAJ) {
1758 if (is_remount) {
1759 if (!sbi->s_journal)
1760 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1761 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1762 ext4_msg(sb, KERN_ERR,
26092bf5 1763 "Cannot change data mode on remount");
26092bf5 1764 return -1;
ac27a0ec 1765 }
26092bf5 1766 } else {
5f3633e3
JK		 1767 clear_opt(sb, DATA_FLAGS);
1768 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1769 }
5f3633e3
JK		 1770#ifdef CONFIG_QUOTA
1771 } else if (m->flags & MOPT_QFMT) {
1772 if (sb_any_quota_loaded(sb) &&
1773 sbi->s_jquota_fmt != m->mount_opt) {
1774 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1775 "quota options when quota turned on");
1776 return -1;
1777 }
e2b911c5 1778 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1779 ext4_msg(sb, KERN_INFO,
1780 "Quota format mount options ignored "
262b4662 1781 "when QUOTA feature is enabled");
c325a67c 1782 return 1;
262b4662 1783 }
5f3633e3 1784 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1785#endif
923ae0ff 1786 } else if (token == Opt_dax) {
ef83b6e8
DW		 1787#ifdef CONFIG_FS_DAX
1788 ext4_msg(sb, KERN_WARNING,
1789 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1790 sbi->s_mount_opt |= m->mount_opt;
1791#else
923ae0ff
RZ		 1792 ext4_msg(sb, KERN_INFO, "dax option not supported");
1793 return -1;
5f3633e3 1794#endif
7915a861
AN		 1795 } else if (token == Opt_data_err_abort) {
1796 sbi->s_mount_opt |= m->mount_opt;
1797 } else if (token == Opt_data_err_ignore) {
1798 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1799 } else {
1800 if (!args->from)
1801 arg = 1;
1802 if (m->flags & MOPT_CLEAR)
1803 arg = !arg;
1804 else if (unlikely(!(m->flags & MOPT_SET))) {
1805 ext4_msg(sb, KERN_WARNING,
1806 "buggy handling of option %s", opt);
1807 WARN_ON(1);
1808 return -1;
1809 }
1810 if (arg != 0)
1811 sbi->s_mount_opt |= m->mount_opt;
1812 else
1813 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1814 }
5f3633e3 1815 return 1;
26092bf5
TT		 1816}
1817
1818static int parse_options(char *options, struct super_block *sb,
1819 unsigned long *journal_devnum,
1820 unsigned int *journal_ioprio,
1821 int is_remount)
1822{
1823 struct ext4_sb_info *sbi = EXT4_SB(sb);
1824 char *p;
1825 substring_t args[MAX_OPT_ARGS];
1826 int token;
1827
1828 if (!options)
1829 return 1;
1830
1831 while ((p = strsep(&options, ",")) != NULL) {
1832 if (!*p)
1833 continue;
1834 /*
1835 * Initialize args struct so we know whether arg was
1836 * found; some options take optional arguments.
1837 */
caecd0af 1838 args[0].to = args[0].from = NULL;
26092bf5
TT		 1839 token = match_token(p, tokens, args);
1840 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1841 journal_ioprio, is_remount) < 0)
1842 return 0;
ac27a0ec
DK		 1843 }
1844#ifdef CONFIG_QUOTA
49da9392
JK		 1845 /*
1846 * We do the test below only for project quotas. 'usrquota' and
1847 * 'grpquota' mount options are allowed even without quota feature
1848 * to support legacy quotas in quota files.
1849 */
1850 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1851 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1852 "Cannot enable project quota enforcement.");
1853 return 0;
1854 }
1855 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1856 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1857 clear_opt(sb, USRQUOTA);
ac27a0ec 1858
482a7425 1859 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1860 clear_opt(sb, GRPQUOTA);
ac27a0ec 1861
56c50f11 1862 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1863 ext4_msg(sb, KERN_ERR, "old and new quota "
1864 "format mixing");
ac27a0ec
DK		 1865 return 0;
1866 }
1867
1868 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1869 ext4_msg(sb, KERN_ERR, "journaled quota format "
1870 "not specified");
ac27a0ec
DK		 1871 return 0;
1872 }
ac27a0ec
DK		 1873 }
1874#endif
261cb20c
JK		 1875 if (test_opt(sb, DIOREAD_NOLOCK)) {
1876 int blocksize =
1877 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1878
09cbfeaf 1879 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 1880 ext4_msg(sb, KERN_ERR, "can't mount with "
1881 "dioread_nolock if block size != PAGE_SIZE");
1882 return 0;
1883 }
1884 }
d4f76107
JK		 1885 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1886 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1887 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1888 "in data=ordered mode");
1889 return 0;
1890 }
ac27a0ec
DK		 1891 return 1;
1892}
1893
2adf6da8
TT		 1894static inline void ext4_show_quota_options(struct seq_file *seq,
1895 struct super_block *sb)
1896{
1897#if defined(CONFIG_QUOTA)
1898 struct ext4_sb_info *sbi = EXT4_SB(sb);
1899
1900 if (sbi->s_jquota_fmt) {
1901 char *fmtname = "";
1902
1903 switch (sbi->s_jquota_fmt) {
1904 case QFMT_VFS_OLD:
1905 fmtname = "vfsold";
1906 break;
1907 case QFMT_VFS_V0:
1908 fmtname = "vfsv0";
1909 break;
1910 case QFMT_VFS_V1:
1911 fmtname = "vfsv1";
1912 break;
1913 }
1914 seq_printf(seq, ",jqfmt=%s", fmtname);
1915 }
1916
1917 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1918 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1919
1920 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1921 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1922#endif
1923}
1924
5a916be1
TT		 1925static const char *token2str(int token)
1926{
50df9fd5 1927 const struct match_token *t;
5a916be1
TT		 1928
1929 for (t = tokens; t->token != Opt_err; t++)
1930 if (t->token == token && !strchr(t->pattern, '='))
1931 break;
1932 return t->pattern;
1933}
1934
2adf6da8
TT		 1935/*
1936 * Show an option if
1937 * - it's set to a non-default value OR
1938 * - if the per-sb default is different from the global default
1939 */
66acdcf4
TT		 1940static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1941 int nodefs)
2adf6da8 1942{
2adf6da8
TT		 1943 struct ext4_sb_info *sbi = EXT4_SB(sb);
1944 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1945 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1946 const struct mount_opts *m;
66acdcf4 1947 char sep = nodefs ? '\n' : ',';
2adf6da8 1948
66acdcf4
TT		 1949#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1950#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1951
1952 if (sbi->s_sb_block != 1)
5a916be1
TT		 1953 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1954
1955 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1956 int want_set = m->flags & MOPT_SET;
1957 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1958 (m->flags & MOPT_CLEAR_ERR))
1959 continue;
66acdcf4 1960 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1961 continue; /* skip if same as the default */
1962 if ((want_set &&
1963 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1964 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1965 continue; /* select Opt_noFoo vs Opt_Foo */
1966 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1967 }
5a916be1 1968
08cefc7a 1969 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1970 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1971 SEQ_OPTS_PRINT("resuid=%u",
1972 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1973 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1974 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1975 SEQ_OPTS_PRINT("resgid=%u",
1976 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1977 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1978 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1979 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1980 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1981 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1982 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1983 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1984 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1985 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1986 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1987 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1988 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1989 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1990 if (sb->s_flags & MS_I_VERSION)
5a916be1 1991 SEQ_OPTS_PUTS("i_version");
66acdcf4 1992 if (nodefs || sbi->s_stripe)
5a916be1 1993 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1994 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1995 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1996 SEQ_OPTS_PUTS("data=journal");
1997 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1998 SEQ_OPTS_PUTS("data=ordered");
1999 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2000 SEQ_OPTS_PUTS("data=writeback");
2001 }
66acdcf4
TT		 2002 if (nodefs ||
2003 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2004 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2005 sbi->s_inode_readahead_blks);
2adf6da8 2006
66acdcf4
TT		 2007 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2008 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2009 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2010 if (nodefs || sbi->s_max_dir_size_kb)
2011 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2012 if (test_opt(sb, DATA_ERR_ABORT))
2013 SEQ_OPTS_PUTS("data_err=abort");
2adf6da8
TT		 2014
2015 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2016 return 0;
2017}
2018
66acdcf4
TT		 2019static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2020{
2021 return _ext4_show_options(seq, root->d_sb, 0);
2022}
2023
ebd173be 2024int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2025{
2026 struct super_block *sb = seq->private;
2027 int rc;
2028
2029 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
2030 rc = _ext4_show_options(seq, sb, 1);
2031 seq_puts(seq, "\n");
2032 return rc;
2033}
2034
617ba13b 2035static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2036 int read_only)
2037{
617ba13b 2038 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2039 int res = 0;
2040
617ba13b 2041 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2042 ext4_msg(sb, KERN_ERR, "revision level too high, "
2043 "forcing read-only mode");
ac27a0ec
DK		 2044 res = MS_RDONLY;
2045 }
2046 if (read_only)
281b5995 2047 goto done;
617ba13b 2048 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2049 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2050 "running e2fsck is recommended");
c8b459f4 2051 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2052 ext4_msg(sb, KERN_WARNING,
2053 "warning: mounting fs with errors, "
2054 "running e2fsck is recommended");
ed3ce80a 2055 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2056 le16_to_cpu(es->s_mnt_count) >=
2057 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2058 ext4_msg(sb, KERN_WARNING,
2059 "warning: maximal mount count reached, "
2060 "running e2fsck is recommended");
ac27a0ec
DK		 2061 else if (le32_to_cpu(es->s_checkinterval) &&
2062 (le32_to_cpu(es->s_lastcheck) +
2063 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 2064 ext4_msg(sb, KERN_WARNING,
2065 "warning: checktime reached, "
2066 "running e2fsck is recommended");
0b8e58a1 2067 if (!sbi->s_journal)
0390131b 2068 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2069 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2070 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2071 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 2072 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 2073 ext4_update_dynamic_rev(sb);
0390131b 2074 if (sbi->s_journal)
e2b911c5 2075 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2076
e2d67052 2077 ext4_commit_super(sb, 1);
281b5995 2078done:
ac27a0ec 2079 if (test_opt(sb, DEBUG))
a9df9a49 2080 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2081 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2082 sb->s_blocksize,
2083 sbi->s_groups_count,
617ba13b
MC		 2084 EXT4_BLOCKS_PER_GROUP(sb),
2085 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2086 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2087
7abc52c2 2088 cleancache_init_fs(sb);
ac27a0ec
DK		 2089 return res;
2090}
2091
117fff10
TT		 2092int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2093{
2094 struct ext4_sb_info *sbi = EXT4_SB(sb);
2095 struct flex_groups *new_groups;
2096 int size;
2097
2098 if (!sbi->s_log_groups_per_flex)
2099 return 0;
2100
2101 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2102 if (size <= sbi->s_flex_groups_allocated)
2103 return 0;
2104
2105 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2106 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2107 if (!new_groups) {
2108 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2109 size / (int) sizeof(struct flex_groups));
2110 return -ENOMEM;
2111 }
2112
2113 if (sbi->s_flex_groups) {
2114 memcpy(new_groups, sbi->s_flex_groups,
2115 (sbi->s_flex_groups_allocated *
2116 sizeof(struct flex_groups)));
b93b41d4 2117 kvfree(sbi->s_flex_groups);
117fff10
TT		 2118 }
2119 sbi->s_flex_groups = new_groups;
2120 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2121 return 0;
2122}
2123
772cb7c8
JS		 2124static int ext4_fill_flex_info(struct super_block *sb)
2125{
2126 struct ext4_sb_info *sbi = EXT4_SB(sb);
2127 struct ext4_group_desc *gdp = NULL;
772cb7c8 2128 ext4_group_t flex_group;
117fff10 2129 int i, err;
772cb7c8 2130
503358ae 2131 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2132 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2133 sbi->s_log_groups_per_flex = 0;
2134 return 1;
2135 }
2136
117fff10
TT		 2137 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2138 if (err)
9933fc0a 2139 goto failed;
772cb7c8 2140
772cb7c8 2141 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2142 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2143
2144 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2145 atomic_add(ext4_free_inodes_count(sb, gdp),
2146 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2147 atomic64_add(ext4_free_group_clusters(sb, gdp),
2148 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2149 atomic_add(ext4_used_dirs_count(sb, gdp),
2150 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2151 }
2152
2153 return 1;
2154failed:
2155 return 0;
2156}
2157
e2b911c5 2158static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2159 struct ext4_group_desc *gdp)
717d50e4 2160{
b47820ed 2161 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2162 __u16 crc = 0;
feb0ab32 2163 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2164 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2165
9aa5d32b 2166 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2167 /* Use new metadata_csum algorithm */
feb0ab32 2168 __u32 csum32;
b47820ed 2169 __u16 dummy_csum = 0;
feb0ab32 2170
feb0ab32
DW		 2171 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2172 sizeof(le_group));
b47820ed
DJ		 2173 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2174 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2175 sizeof(dummy_csum));
2176 offset += sizeof(dummy_csum);
2177 if (offset < sbi->s_desc_size)
2178 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2179 sbi->s_desc_size - offset);
feb0ab32
DW		 2180
2181 crc = csum32 & 0xFFFF;
2182 goto out;
717d50e4
AD		 2183 }
2184
feb0ab32 2185 /* old crc16 code */
e2b911c5 2186 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2187 return 0;
2188
feb0ab32
DW		 2189 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2190 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2191 crc = crc16(crc, (__u8 *)gdp, offset);
2192 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2193 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2194 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2195 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2196 crc = crc16(crc, (__u8 *)gdp + offset,
2197 le16_to_cpu(sbi->s_es->s_desc_size) -
2198 offset);
2199
2200out:
717d50e4
AD		 2201 return cpu_to_le16(crc);
2202}
2203
feb0ab32 2204int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2205 struct ext4_group_desc *gdp)
2206{
feb0ab32 2207 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2208 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2209 return 0;
2210
2211 return 1;
2212}
2213
feb0ab32
DW		 2214void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2215 struct ext4_group_desc *gdp)
2216{
2217 if (!ext4_has_group_desc_csum(sb))
2218 return;
e2b911c5 2219 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2220}
2221
ac27a0ec 2222/* Called at mount-time, super-block is locked */
bfff6873 2223static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2224 ext4_fsblk_t sb_block,
bfff6873 2225 ext4_group_t *first_not_zeroed)
ac27a0ec 2226{
617ba13b
MC		 2227 struct ext4_sb_info *sbi = EXT4_SB(sb);
2228 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2229 ext4_fsblk_t last_block;
bd81d8ee
LV		 2230 ext4_fsblk_t block_bitmap;
2231 ext4_fsblk_t inode_bitmap;
2232 ext4_fsblk_t inode_table;
ce421581 2233 int flexbg_flag = 0;
bfff6873 2234 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2235
e2b911c5 2236 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2237 flexbg_flag = 1;
2238
af5bc92d 2239 ext4_debug("Checking group descriptors");
ac27a0ec 2240
197cd65a
AM		 2241 for (i = 0; i < sbi->s_groups_count; i++) {
2242 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2243
ce421581 2244 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2245 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2246 else
2247 last_block = first_block +
617ba13b 2248 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2249
bfff6873
LC		 2250 if ((grp == sbi->s_groups_count) &&
2251 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2252 grp = i;
2253
8fadc143 2254 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2255 if (block_bitmap == sb_block) {
2256 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2257 "Block bitmap for group %u overlaps "
2258 "superblock", i);
2259 }
2b2d6d01 2260 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2261 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2262 "Block bitmap for group %u not in group "
b31e1552 2263 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2264 return 0;
2265 }
8fadc143 2266 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2267 if (inode_bitmap == sb_block) {
2268 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2269 "Inode bitmap for group %u overlaps "
2270 "superblock", i);
2271 }
2b2d6d01 2272 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2273 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2274 "Inode bitmap for group %u not in group "
b31e1552 2275 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2276 return 0;
2277 }
8fadc143 2278 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2279 if (inode_table == sb_block) {
2280 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2281 "Inode table for group %u overlaps "
2282 "superblock", i);
2283 }
bd81d8ee 2284 if (inode_table < first_block ||
2b2d6d01 2285 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2286 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2287 "Inode table for group %u not in group "
b31e1552 2288 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2289 return 0;
2290 }
955ce5f5 2291 ext4_lock_group(sb, i);
feb0ab32 2292 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2293 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2294 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2295 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2296 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2297 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2298 ext4_unlock_group(sb, i);
8a266467 2299 return 0;
7ee1ec4c 2300 }
717d50e4 2301 }
955ce5f5 2302 ext4_unlock_group(sb, i);
ce421581
JS		 2303 if (!flexbg_flag)
2304 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2305 }
bfff6873
LC		 2306 if (NULL != first_not_zeroed)
2307 *first_not_zeroed = grp;
ac27a0ec
DK		 2308 return 1;
2309}
2310
617ba13b 2311/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2312 * the superblock) which were deleted from all directories, but held open by
2313 * a process at the time of a crash. We walk the list and try to delete these
2314 * inodes at recovery time (only with a read-write filesystem).
2315 *
2316 * In order to keep the orphan inode chain consistent during traversal (in
2317 * case of crash during recovery), we link each inode into the superblock
2318 * orphan list_head and handle it the same way as an inode deletion during
2319 * normal operation (which journals the operations for us).
2320 *
2321 * We only do an iget() and an iput() on each inode, which is very safe if we
2322 * accidentally point at an in-use or already deleted inode. The worst that
2323 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2324 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2325 * e2fsck was run on this filesystem, and it must have already done the orphan
2326 * inode cleanup for us, so we can safely abort without any further action.
2327 */
2b2d6d01
TT		 2328static void ext4_orphan_cleanup(struct super_block *sb,
2329 struct ext4_super_block *es)
ac27a0ec
DK		 2330{
2331 unsigned int s_flags = sb->s_flags;
2332 int nr_orphans = 0, nr_truncates = 0;
2333#ifdef CONFIG_QUOTA
2334 int i;
2335#endif
2336 if (!es->s_last_orphan) {
2337 jbd_debug(4, "no orphan inodes to clean up\n");
2338 return;
2339 }
2340
a8f48a95 2341 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2342 ext4_msg(sb, KERN_ERR, "write access "
2343 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2344 return;
2345 }
2346
d39195c3
AG		 2347 /* Check if feature set would not allow a r/w mount */
2348 if (!ext4_feature_set_ok(sb, 0)) {
2349 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2350 "unknown ROCOMPAT features");
2351 return;
2352 }
2353
617ba13b 2354 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2355 /* don't clear list on RO mount w/ errors */
2356 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2357 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2358 "clearing orphan list.\n");
c25f9bc6
ES		 2359 es->s_last_orphan = 0;
2360 }
ac27a0ec
DK		 2361 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2362 return;
2363 }
2364
2365 if (s_flags & MS_RDONLY) {
b31e1552 2366 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2367 sb->s_flags &= ~MS_RDONLY;
2368 }
2369#ifdef CONFIG_QUOTA
2370 /* Needed for iput() to work correctly and not trash data */
2371 sb->s_flags |= MS_ACTIVE;
2372 /* Turn on quotas so that they are updated correctly */
a2d4a646 2373 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2374 if (EXT4_SB(sb)->s_qf_names[i]) {
2375 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2376 if (ret < 0)
b31e1552
ES		 2377 ext4_msg(sb, KERN_ERR,
2378 "Cannot turn on journaled "
2379 "quota: error %d", ret);
ac27a0ec
DK		 2380 }
2381 }
2382#endif
2383
2384 while (es->s_last_orphan) {
2385 struct inode *inode;
2386
c65d5c6c
VN		 2387 /*
2388 * We may have encountered an error during cleanup; if
2389 * so, skip the rest.
2390 */
2391 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2392 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2393 es->s_last_orphan = 0;
2394 break;
2395 }
2396
97bd42b9
JB		 2397 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2398 if (IS_ERR(inode)) {
ac27a0ec
DK		 2399 es->s_last_orphan = 0;
2400 break;
2401 }
2402
617ba13b 2403 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2404 dquot_initialize(inode);
ac27a0ec 2405 if (inode->i_nlink) {
566370a2
PT		 2406 if (test_opt(sb, DEBUG))
2407 ext4_msg(sb, KERN_DEBUG,
2408 "%s: truncating inode %lu to %lld bytes",
2409 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2410 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2411 inode->i_ino, inode->i_size);
5955102c 2412 inode_lock(inode);
55f252c9 2413 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2414 ext4_truncate(inode);
5955102c 2415 inode_unlock(inode);
ac27a0ec
DK		 2416 nr_truncates++;
2417 } else {
566370a2
PT		 2418 if (test_opt(sb, DEBUG))
2419 ext4_msg(sb, KERN_DEBUG,
2420 "%s: deleting unreferenced inode %lu",
2421 __func__, inode->i_ino);
ac27a0ec
DK		 2422 jbd_debug(2, "deleting unreferenced inode %lu\n",
2423 inode->i_ino);
2424 nr_orphans++;
2425 }
2426 iput(inode); /* The delete magic happens here! */
2427 }
2428
2b2d6d01 2429#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2430
2431 if (nr_orphans)
b31e1552
ES		 2432 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2433 PLURAL(nr_orphans));
ac27a0ec 2434 if (nr_truncates)
b31e1552
ES		 2435 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2436 PLURAL(nr_truncates));
ac27a0ec
DK		 2437#ifdef CONFIG_QUOTA
2438 /* Turn quotas off */
a2d4a646 2439 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2440 if (sb_dqopt(sb)->files[i])
287a8095 2441 dquot_quota_off(sb, i);
ac27a0ec
DK		 2442 }
2443#endif
2444 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2445}
0b8e58a1 2446
cd2291a4
ES		 2447/*
2448 * Maximal extent format file size.
2449 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2450 * extent format containers, within a sector_t, and within i_blocks
2451 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2452 * so that won't be a limiting factor.
2453 *
f17722f9
LC		 2454 * However there is other limiting factor. We do store extents in the form
2455 * of starting block and length, hence the resulting length of the extent
2456 * covering maximum file size must fit into on-disk format containers as
2457 * well. Given that length is always by 1 unit bigger than max unit (because
2458 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2459 *
cd2291a4
ES		 2460 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2461 */
f287a1a5 2462static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2463{
2464 loff_t res;
2465 loff_t upper_limit = MAX_LFS_FILESIZE;
2466
2467 /* small i_blocks in vfs inode? */
f287a1a5 2468 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2469 /*
90c699a9 2470 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2471 * i_block represent total blocks in 512 bytes
2472 * 32 == size of vfs inode i_blocks * 8
2473 */
2474 upper_limit = (1LL << 32) - 1;
2475
2476 /* total blocks in file system block size */
2477 upper_limit >>= (blkbits - 9);
2478 upper_limit <<= blkbits;
2479 }
2480
f17722f9
LC		 2481 /*
2482 * 32-bit extent-start container, ee_block. We lower the maxbytes
2483 * by one fs block, so ee_len can cover the extent of maximum file
2484 * size
2485 */
2486 res = (1LL << 32) - 1;
cd2291a4 2487 res <<= blkbits;
cd2291a4
ES		 2488
2489 /* Sanity check against vm- & vfs- imposed limits */
2490 if (res > upper_limit)
2491 res = upper_limit;
2492
2493 return res;
2494}
ac27a0ec 2495
ac27a0ec 2496/*
cd2291a4 2497 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2498 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2499 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2500 */
f287a1a5 2501static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2502{
617ba13b 2503 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2504 int meta_blocks;
2505 loff_t upper_limit;
0b8e58a1
AD		 2506 /* This is calculated to be the largest file size for a dense, block
2507 * mapped file such that the file's total number of 512-byte sectors,
2508 * including data and all indirect blocks, does not exceed (2^48 - 1).
2509 *
2510 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2511 * number of 512-byte sectors of the file.
0fc1b451
AK		 2512 */
2513
f287a1a5 2514 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2515 /*
90c699a9 2516 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2517 * the inode i_block field represents total file blocks in
2518 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2519 */
2520 upper_limit = (1LL << 32) - 1;
2521
2522 /* total blocks in file system block size */
2523 upper_limit >>= (bits - 9);
2524
2525 } else {
8180a562
AK		 2526 /*
2527 * We use 48 bit ext4_inode i_blocks
2528 * With EXT4_HUGE_FILE_FL set the i_blocks
2529 * represent total number of blocks in
2530 * file system block size
2531 */
0fc1b451
AK		 2532 upper_limit = (1LL << 48) - 1;
2533
0fc1b451
AK		 2534 }
2535
2536 /* indirect blocks */
2537 meta_blocks = 1;
2538 /* double indirect blocks */
2539 meta_blocks += 1 + (1LL << (bits-2));
2540 /* tripple indirect blocks */
2541 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2542
2543 upper_limit -= meta_blocks;
2544 upper_limit <<= bits;
ac27a0ec
DK		 2545
2546 res += 1LL << (bits-2);
2547 res += 1LL << (2*(bits-2));
2548 res += 1LL << (3*(bits-2));
2549 res <<= bits;
2550 if (res > upper_limit)
2551 res = upper_limit;
0fc1b451
AK		 2552
2553 if (res > MAX_LFS_FILESIZE)
2554 res = MAX_LFS_FILESIZE;
2555
ac27a0ec
DK		 2556 return res;
2557}
2558
617ba13b 2559static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2560 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2561{
617ba13b 2562 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2563 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2564 int has_super = 0;
2565
2566 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2567
e2b911c5 2568 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2569 return logical_sb_block + nr + 1;
ac27a0ec 2570 bg = sbi->s_desc_per_block * nr;
617ba13b 2571 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2572 has_super = 1;
0b8e58a1 2573
bd63f6b0
DW		 2574 /*
2575 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2576 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2577 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2578 * compensate.
2579 */
2580 if (sb->s_blocksize == 1024 && nr == 0 &&
2581 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2582 has_super++;
2583
617ba13b 2584 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2585}
2586
c9de560d
AT		 2587/**
2588 * ext4_get_stripe_size: Get the stripe size.
2589 * @sbi: In memory super block info
2590 *
2591 * If we have specified it via mount option, then
2592 * use the mount option value. If the value specified at mount time is
2593 * greater than the blocks per group use the super block value.
2594 * If the super block value is greater than blocks per group return 0.
2595 * Allocator needs it be less than blocks per group.
2596 *
2597 */
2598static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2599{
2600 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2601 unsigned long stripe_width =
2602 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2603 int ret;
c9de560d
AT		 2604
2605 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2606 ret = sbi->s_stripe;
2607 else if (stripe_width <= sbi->s_blocks_per_group)
2608 ret = stripe_width;
2609 else if (stride <= sbi->s_blocks_per_group)
2610 ret = stride;
2611 else
2612 ret = 0;
c9de560d 2613
3eb08658
DE		 2614 /*
2615 * If the stripe width is 1, this makes no sense and
2616 * we set it to 0 to turn off stripe handling code.
2617 */
2618 if (ret <= 1)
2619 ret = 0;
c9de560d 2620
3eb08658 2621 return ret;
c9de560d 2622}
ac27a0ec 2623
a13fb1a4
ES		 2624/*
2625 * Check whether this filesystem can be mounted based on
2626 * the features present and the RDONLY/RDWR mount requested.
2627 * Returns 1 if this filesystem can be mounted as requested,
2628 * 0 if it cannot be.
2629 */
2630static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2631{
e2b911c5 2632 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2633 ext4_msg(sb, KERN_ERR,
2634 "Couldn't mount because of "
2635 "unsupported optional features (%x)",
2636 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2637 ~EXT4_FEATURE_INCOMPAT_SUPP));
2638 return 0;
2639 }
2640
2641 if (readonly)
2642 return 1;
2643
e2b911c5 2644 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2645 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2646 sb->s_flags |= MS_RDONLY;
2647 return 1;
2648 }
2649
a13fb1a4 2650 /* Check that feature set is OK for a read-write mount */
e2b911c5 2651 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2652 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2653 "unsupported optional features (%x)",
2654 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2655 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2656 return 0;
2657 }
2658 /*
2659 * Large file size enabled file system can only be mounted
2660 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2661 */
e2b911c5 2662 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2663 if (sizeof(blkcnt_t) < sizeof(u64)) {
2664 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2665 "cannot be mounted RDWR without "
2666 "CONFIG_LBDAF");
2667 return 0;
2668 }
2669 }
e2b911c5 2670 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2671 ext4_msg(sb, KERN_ERR,
2672 "Can't support bigalloc feature without "
2673 "extents feature\n");
2674 return 0;
2675 }
7c319d32
AK		 2676
2677#ifndef CONFIG_QUOTA
e2b911c5 2678 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2679 ext4_msg(sb, KERN_ERR,
2680 "Filesystem with quota feature cannot be mounted RDWR "
2681 "without CONFIG_QUOTA");
2682 return 0;
2683 }
689c958c
LX		 2684 if (ext4_has_feature_project(sb) && !readonly) {
2685 ext4_msg(sb, KERN_ERR,
2686 "Filesystem with project quota feature cannot be mounted RDWR "
2687 "without CONFIG_QUOTA");
2688 return 0;
2689 }
7c319d32 2690#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2691 return 1;
2692}
2693
66e61a9e
TT		 2694/*
2695 * This function is called once a day if we have errors logged
2696 * on the file system
2697 */
2698static void print_daily_error_info(unsigned long arg)
2699{
2700 struct super_block *sb = (struct super_block *) arg;
2701 struct ext4_sb_info *sbi;
2702 struct ext4_super_block *es;
2703
2704 sbi = EXT4_SB(sb);
2705 es = sbi->s_es;
2706
2707 if (es->s_error_count)
ae0f78de
TT		 2708 /* fsck newer than v1.41.13 is needed to clean this condition. */
2709 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2710 le32_to_cpu(es->s_error_count));
2711 if (es->s_first_error_time) {
ae0f78de 2712 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2713 sb->s_id, le32_to_cpu(es->s_first_error_time),
2714 (int) sizeof(es->s_first_error_func),
2715 es->s_first_error_func,
2716 le32_to_cpu(es->s_first_error_line));
2717 if (es->s_first_error_ino)
2718 printk(": inode %u",
2719 le32_to_cpu(es->s_first_error_ino));
2720 if (es->s_first_error_block)
2721 printk(": block %llu", (unsigned long long)
2722 le64_to_cpu(es->s_first_error_block));
2723 printk("\n");
2724 }
2725 if (es->s_last_error_time) {
ae0f78de 2726 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2727 sb->s_id, le32_to_cpu(es->s_last_error_time),
2728 (int) sizeof(es->s_last_error_func),
2729 es->s_last_error_func,
2730 le32_to_cpu(es->s_last_error_line));
2731 if (es->s_last_error_ino)
2732 printk(": inode %u",
2733 le32_to_cpu(es->s_last_error_ino));
2734 if (es->s_last_error_block)
2735 printk(": block %llu", (unsigned long long)
2736 le64_to_cpu(es->s_last_error_block));
2737 printk("\n");
2738 }
2739 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2740}
2741
bfff6873
LC		 2742/* Find next suitable group and run ext4_init_inode_table */
2743static int ext4_run_li_request(struct ext4_li_request *elr)
2744{
2745 struct ext4_group_desc *gdp = NULL;
2746 ext4_group_t group, ngroups;
2747 struct super_block *sb;
2748 unsigned long timeout = 0;
2749 int ret = 0;
2750
2751 sb = elr->lr_super;
2752 ngroups = EXT4_SB(sb)->s_groups_count;
2753
2754 for (group = elr->lr_next_group; group < ngroups; group++) {
2755 gdp = ext4_get_group_desc(sb, group, NULL);
2756 if (!gdp) {
2757 ret = 1;
2758 break;
2759 }
2760
2761 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2762 break;
2763 }
2764
7f511862 2765 if (group >= ngroups)
bfff6873
LC		 2766 ret = 1;
2767
2768 if (!ret) {
2769 timeout = jiffies;
2770 ret = ext4_init_inode_table(sb, group,
2771 elr->lr_timeout ? 0 : 1);
2772 if (elr->lr_timeout == 0) {
51ce6511
LC		 2773 timeout = (jiffies - timeout) *
2774 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2775 elr->lr_timeout = timeout;
2776 }
2777 elr->lr_next_sched = jiffies + elr->lr_timeout;
2778 elr->lr_next_group = group + 1;
2779 }
bfff6873
LC		 2780 return ret;
2781}
2782
2783/*
2784 * Remove lr_request from the list_request and free the
4ed5c033 2785 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2786 */
2787static void ext4_remove_li_request(struct ext4_li_request *elr)
2788{
2789 struct ext4_sb_info *sbi;
2790
2791 if (!elr)
2792 return;
2793
2794 sbi = elr->lr_sbi;
2795
2796 list_del(&elr->lr_request);
2797 sbi->s_li_request = NULL;
2798 kfree(elr);
2799}
2800
2801static void ext4_unregister_li_request(struct super_block *sb)
2802{
1bb933fb
LC		 2803 mutex_lock(&ext4_li_mtx);
2804 if (!ext4_li_info) {
2805 mutex_unlock(&ext4_li_mtx);
bfff6873 2806 return;
1bb933fb 2807 }
bfff6873
LC		 2808
2809 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2810 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2811 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2812 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2813}
2814
8f1f7453
ES		 2815static struct task_struct *ext4_lazyinit_task;
2816
bfff6873
LC		 2817/*
2818 * This is the function where ext4lazyinit thread lives. It walks
2819 * through the request list searching for next scheduled filesystem.
2820 * When such a fs is found, run the lazy initialization request
2821 * (ext4_rn_li_request) and keep track of the time spend in this
2822 * function. Based on that time we compute next schedule time of
2823 * the request. When walking through the list is complete, compute
2824 * next waking time and put itself into sleep.
2825 */
2826static int ext4_lazyinit_thread(void *arg)
2827{
2828 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2829 struct list_head *pos, *n;
2830 struct ext4_li_request *elr;
4ed5c033 2831 unsigned long next_wakeup, cur;
bfff6873
LC		 2832
2833 BUG_ON(NULL == eli);
2834
bfff6873
LC		 2835cont_thread:
2836 while (true) {
2837 next_wakeup = MAX_JIFFY_OFFSET;
2838
2839 mutex_lock(&eli->li_list_mtx);
2840 if (list_empty(&eli->li_request_list)) {
2841 mutex_unlock(&eli->li_list_mtx);
2842 goto exit_thread;
2843 }
bfff6873 2844 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 2845 int err = 0;
2846 int progress = 0;
bfff6873
LC		 2847 elr = list_entry(pos, struct ext4_li_request,
2848 lr_request);
2849
e22834f0
DM		 2850 if (time_before(jiffies, elr->lr_next_sched)) {
2851 if (time_before(elr->lr_next_sched, next_wakeup))
2852 next_wakeup = elr->lr_next_sched;
2853 continue;
2854 }
2855 if (down_read_trylock(&elr->lr_super->s_umount)) {
2856 if (sb_start_write_trylock(elr->lr_super)) {
2857 progress = 1;
2858 /*
2859 * We hold sb->s_umount, sb can not
2860 * be removed from the list, it is
2861 * now safe to drop li_list_mtx
2862 */
2863 mutex_unlock(&eli->li_list_mtx);
2864 err = ext4_run_li_request(elr);
2865 sb_end_write(elr->lr_super);
2866 mutex_lock(&eli->li_list_mtx);
2867 n = pos->next;
b2c78cd0 2868 }
e22834f0
DM		 2869 up_read((&elr->lr_super->s_umount));
2870 }
2871 /* error, remove the lazy_init job */
2872 if (err) {
2873 ext4_remove_li_request(elr);
2874 continue;
2875 }
2876 if (!progress) {
2877 elr->lr_next_sched = jiffies +
2878 (prandom_u32()
2879 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 2880 }
bfff6873
LC		 2881 if (time_before(elr->lr_next_sched, next_wakeup))
2882 next_wakeup = elr->lr_next_sched;
2883 }
2884 mutex_unlock(&eli->li_list_mtx);
2885
a0acae0e 2886 try_to_freeze();
bfff6873 2887
4ed5c033
LC		 2888 cur = jiffies;
2889 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2890 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2891 cond_resched();
2892 continue;
2893 }
2894
4ed5c033
LC		 2895 schedule_timeout_interruptible(next_wakeup - cur);
2896
8f1f7453
ES		 2897 if (kthread_should_stop()) {
2898 ext4_clear_request_list();
2899 goto exit_thread;
2900 }
bfff6873
LC		 2901 }
2902
2903exit_thread:
2904 /*
2905 * It looks like the request list is empty, but we need
2906 * to check it under the li_list_mtx lock, to prevent any
2907 * additions into it, and of course we should lock ext4_li_mtx
2908 * to atomically free the list and ext4_li_info, because at
2909 * this point another ext4 filesystem could be registering
2910 * new one.
2911 */
2912 mutex_lock(&ext4_li_mtx);
2913 mutex_lock(&eli->li_list_mtx);
2914 if (!list_empty(&eli->li_request_list)) {
2915 mutex_unlock(&eli->li_list_mtx);
2916 mutex_unlock(&ext4_li_mtx);
2917 goto cont_thread;
2918 }
2919 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2920 kfree(ext4_li_info);
2921 ext4_li_info = NULL;
2922 mutex_unlock(&ext4_li_mtx);
2923
2924 return 0;
2925}
2926
2927static void ext4_clear_request_list(void)
2928{
2929 struct list_head *pos, *n;
2930 struct ext4_li_request *elr;
2931
2932 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2933 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2934 elr = list_entry(pos, struct ext4_li_request,
2935 lr_request);
2936 ext4_remove_li_request(elr);
2937 }
2938 mutex_unlock(&ext4_li_info->li_list_mtx);
2939}
2940
2941static int ext4_run_lazyinit_thread(void)
2942{
8f1f7453
ES		 2943 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2944 ext4_li_info, "ext4lazyinit");
2945 if (IS_ERR(ext4_lazyinit_task)) {
2946 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2947 ext4_clear_request_list();
bfff6873
LC		 2948 kfree(ext4_li_info);
2949 ext4_li_info = NULL;
92b97816 2950 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2951 "initialization thread\n",
2952 err);
2953 return err;
2954 }
2955 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2956 return 0;
2957}
2958
2959/*
2960 * Check whether it make sense to run itable init. thread or not.
2961 * If there is at least one uninitialized inode table, return
2962 * corresponding group number, else the loop goes through all
2963 * groups and return total number of groups.
2964 */
2965static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2966{
2967 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2968 struct ext4_group_desc *gdp = NULL;
2969
2970 for (group = 0; group < ngroups; group++) {
2971 gdp = ext4_get_group_desc(sb, group, NULL);
2972 if (!gdp)
2973 continue;
2974
2975 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2976 break;
2977 }
2978
2979 return group;
2980}
2981
2982static int ext4_li_info_new(void)
2983{
2984 struct ext4_lazy_init *eli = NULL;
2985
2986 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2987 if (!eli)
2988 return -ENOMEM;
2989
bfff6873
LC		 2990 INIT_LIST_HEAD(&eli->li_request_list);
2991 mutex_init(&eli->li_list_mtx);
2992
bfff6873
LC		 2993 eli->li_state |= EXT4_LAZYINIT_QUIT;
2994
2995 ext4_li_info = eli;
2996
2997 return 0;
2998}
2999
3000static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3001 ext4_group_t start)
3002{
3003 struct ext4_sb_info *sbi = EXT4_SB(sb);
3004 struct ext4_li_request *elr;
bfff6873
LC		 3005
3006 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3007 if (!elr)
3008 return NULL;
3009
3010 elr->lr_super = sb;
3011 elr->lr_sbi = sbi;
3012 elr->lr_next_group = start;
3013
3014 /*
3015 * Randomize first schedule time of the request to
3016 * spread the inode table initialization requests
3017 * better.
3018 */
dd1f723b
TT		 3019 elr->lr_next_sched = jiffies + (prandom_u32() %
3020 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3021 return elr;
3022}
3023
7f511862
TT		 3024int ext4_register_li_request(struct super_block *sb,
3025 ext4_group_t first_not_zeroed)
bfff6873
LC		 3026{
3027 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3028 struct ext4_li_request *elr = NULL;
bfff6873 3029 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3030 int ret = 0;
bfff6873 3031
7f511862 3032 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3033 if (sbi->s_li_request != NULL) {
3034 /*
3035 * Reset timeout so it can be computed again, because
3036 * s_li_wait_mult might have changed.
3037 */
3038 sbi->s_li_request->lr_timeout = 0;
7f511862 3039 goto out;
51ce6511 3040 }
bfff6873
LC		 3041
3042 if (first_not_zeroed == ngroups ||
3043 (sb->s_flags & MS_RDONLY) ||
55ff3840 3044 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3045 goto out;
bfff6873
LC		 3046
3047 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3048 if (!elr) {
3049 ret = -ENOMEM;
3050 goto out;
3051 }
bfff6873
LC		 3052
3053 if (NULL == ext4_li_info) {
3054 ret = ext4_li_info_new();
3055 if (ret)
3056 goto out;
3057 }
3058
3059 mutex_lock(&ext4_li_info->li_list_mtx);
3060 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3061 mutex_unlock(&ext4_li_info->li_list_mtx);
3062
3063 sbi->s_li_request = elr;
46e4690b
TM		 3064 /*
3065 * set elr to NULL here since it has been inserted to
3066 * the request_list and the removal and free of it is
3067 * handled by ext4_clear_request_list from now on.
3068 */
3069 elr = NULL;
bfff6873
LC		 3070
3071 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3072 ret = ext4_run_lazyinit_thread();
3073 if (ret)
3074 goto out;
3075 }
bfff6873 3076out:
beed5ecb
NK		 3077 mutex_unlock(&ext4_li_mtx);
3078 if (ret)
bfff6873 3079 kfree(elr);
bfff6873
LC		 3080 return ret;
3081}
3082
3083/*
3084 * We do not need to lock anything since this is called on
3085 * module unload.
3086 */
3087static void ext4_destroy_lazyinit_thread(void)
3088{
3089 /*
3090 * If thread exited earlier
3091 * there's nothing to be done.
3092 */
8f1f7453 3093 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3094 return;
3095
8f1f7453 3096 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3097}
3098
25ed6e8a
DW		 3099static int set_journal_csum_feature_set(struct super_block *sb)
3100{
3101 int ret = 1;
3102 int compat, incompat;
3103 struct ext4_sb_info *sbi = EXT4_SB(sb);
3104
9aa5d32b 3105 if (ext4_has_metadata_csum(sb)) {
db9ee220 3106 /* journal checksum v3 */
25ed6e8a 3107 compat = 0;
db9ee220 3108 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3109 } else {
3110 /* journal checksum v1 */
3111 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3112 incompat = 0;
3113 }
3114
feb8c6d3
DW		 3115 jbd2_journal_clear_features(sbi->s_journal,
3116 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3117 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3118 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3119 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3120 ret = jbd2_journal_set_features(sbi->s_journal,
3121 compat, 0,
3122 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3123 incompat);
3124 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3125 ret = jbd2_journal_set_features(sbi->s_journal,
3126 compat, 0,
3127 incompat);
3128 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3129 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3130 } else {
feb8c6d3
DW		 3131 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3132 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3133 }
3134
3135 return ret;
3136}
3137
952fc18e
TT		 3138/*
3139 * Note: calculating the overhead so we can be compatible with
3140 * historical BSD practice is quite difficult in the face of
3141 * clusters/bigalloc. This is because multiple metadata blocks from
3142 * different block group can end up in the same allocation cluster.
3143 * Calculating the exact overhead in the face of clustered allocation
3144 * requires either O(all block bitmaps) in memory or O(number of block
3145 * groups**2) in time. We will still calculate the superblock for
3146 * older file systems --- and if we come across with a bigalloc file
3147 * system with zero in s_overhead_clusters the estimate will be close to
3148 * correct especially for very large cluster sizes --- but for newer
3149 * file systems, it's better to calculate this figure once at mkfs
3150 * time, and store it in the superblock. If the superblock value is
3151 * present (even for non-bigalloc file systems), we will use it.
3152 */
3153static int count_overhead(struct super_block *sb, ext4_group_t grp,
3154 char *buf)
3155{
3156 struct ext4_sb_info *sbi = EXT4_SB(sb);
3157 struct ext4_group_desc *gdp;
3158 ext4_fsblk_t first_block, last_block, b;
3159 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3160 int s, j, count = 0;
3161
e2b911c5 3162 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3163 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3164 sbi->s_itb_per_group + 2);
3165
952fc18e
TT		 3166 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3167 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3168 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3169 for (i = 0; i < ngroups; i++) {
3170 gdp = ext4_get_group_desc(sb, i, NULL);
3171 b = ext4_block_bitmap(sb, gdp);
3172 if (b >= first_block && b <= last_block) {
3173 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3174 count++;
3175 }
3176 b = ext4_inode_bitmap(sb, gdp);
3177 if (b >= first_block && b <= last_block) {
3178 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3179 count++;
3180 }
3181 b = ext4_inode_table(sb, gdp);
3182 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3183 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3184 int c = EXT4_B2C(sbi, b - first_block);
3185 ext4_set_bit(c, buf);
3186 count++;
3187 }
3188 if (i != grp)
3189 continue;
3190 s = 0;
3191 if (ext4_bg_has_super(sb, grp)) {
3192 ext4_set_bit(s++, buf);
3193 count++;
3194 }
3195 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3196 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3197 count++;
3198 }
3199 }
3200 if (!count)
3201 return 0;
3202 return EXT4_CLUSTERS_PER_GROUP(sb) -
3203 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3204}
3205
3206/*
3207 * Compute the overhead and stash it in sbi->s_overhead
3208 */
3209int ext4_calculate_overhead(struct super_block *sb)
3210{
3211 struct ext4_sb_info *sbi = EXT4_SB(sb);
3212 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3213 struct inode *j_inode;
3214 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3215 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3216 ext4_fsblk_t overhead = 0;
4fdb5543 3217 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3218
952fc18e
TT		 3219 if (!buf)
3220 return -ENOMEM;
3221
3222 /*
3223 * Compute the overhead (FS structures). This is constant
3224 * for a given filesystem unless the number of block groups
3225 * changes so we cache the previous value until it does.
3226 */
3227
3228 /*
3229 * All of the blocks before first_data_block are overhead
3230 */
3231 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3232
3233 /*
3234 * Add the overhead found in each block group
3235 */
3236 for (i = 0; i < ngroups; i++) {
3237 int blks;
3238
3239 blks = count_overhead(sb, i, buf);
3240 overhead += blks;
3241 if (blks)
3242 memset(buf, 0, PAGE_SIZE);
3243 cond_resched();
3244 }
3c816ded
EW		 3245
3246 /*
3247 * Add the internal journal blocks whether the journal has been
3248 * loaded or not
3249 */
b003b524 3250 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3251 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3252 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3253 j_inode = ext4_get_journal_inode(sb, j_inum);
3254 if (j_inode) {
3255 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3256 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3257 iput(j_inode);
3258 } else {
3259 ext4_msg(sb, KERN_ERR, "can't get journal size");
3260 }
3261 }
952fc18e
TT		 3262 sbi->s_overhead = overhead;
3263 smp_wmb();
3264 free_page((unsigned long) buf);
3265 return 0;
3266}
3267
b5799018 3268static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3269{
3270 ext4_fsblk_t resv_clusters;
b5799018 3271 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3272
30fac0f7
JK		 3273 /*
3274 * There's no need to reserve anything when we aren't using extents.
3275 * The space estimates are exact, there are no unwritten extents,
3276 * hole punching doesn't need new metadata... This is needed especially
3277 * to keep ext2/3 backward compatibility.
3278 */
e2b911c5 3279 if (!ext4_has_feature_extents(sb))
b5799018 3280 return;
27dd4385
LC		 3281 /*
3282 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3283 * This should cover the situations where we can not afford to run
3284 * out of space like for example punch hole, or converting
556615dc 3285 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3286 * allocation would require 1, or 2 blocks, higher numbers are
3287 * very rare.
3288 */
b5799018
TT		 3289 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3290 sbi->s_cluster_bits);
27dd4385
LC		 3291
3292 do_div(resv_clusters, 50);
3293 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3294
b5799018 3295 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3296}
3297
2b2d6d01 3298static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3299{
d4c402d9 3300 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3301 struct buffer_head *bh;
617ba13b
MC		 3302 struct ext4_super_block *es = NULL;
3303 struct ext4_sb_info *sbi;
3304 ext4_fsblk_t block;
3305 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3306 ext4_fsblk_t logical_sb_block;
ac27a0ec 3307 unsigned long offset = 0;
ac27a0ec
DK		 3308 unsigned long journal_devnum = 0;
3309 unsigned long def_mount_opts;
3310 struct inode *root;
0390131b 3311 const char *descr;
dcc7dae3 3312 int ret = -ENOMEM;
281b5995 3313 int blocksize, clustersize;
4ec11028
TT		 3314 unsigned int db_count;
3315 unsigned int i;
281b5995 3316 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3317 __u64 blocks_count;
07aa2ea1 3318 int err = 0;
b3881f74 3319 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3320 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3321
3322 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3323 if (!sbi)
dcc7dae3 3324 goto out_free_orig;
705895b6
PE		 3325
3326 sbi->s_blockgroup_lock =
3327 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3328 if (!sbi->s_blockgroup_lock) {
3329 kfree(sbi);
dcc7dae3 3330 goto out_free_orig;
705895b6 3331 }
ac27a0ec 3332 sb->s_fs_info = sbi;
2c0544b2 3333 sbi->s_sb = sb;
240799cd 3334 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3335 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3336 if (sb->s_bdev->bd_part)
3337 sbi->s_sectors_written_start =
3338 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3339
9f6200bb 3340 /* Cleanup superblock name */
ec3904dc 3341 strreplace(sb->s_id, '/', '!');
9f6200bb 3342
07aa2ea1 3343 /* -EINVAL is default */
dcc7dae3 3344 ret = -EINVAL;
617ba13b 3345 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3346 if (!blocksize) {
b31e1552 3347 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3348 goto out_fail;
3349 }
3350
3351 /*
617ba13b 3352 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3353 * block sizes. We need to calculate the offset from buffer start.
3354 */
617ba13b 3355 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3356 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3357 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3358 } else {
70bbb3e0 3359 logical_sb_block = sb_block;
ac27a0ec
DK		 3360 }
3361
a8ac900b 3362 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3363 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3364 goto out_fail;
3365 }
3366 /*
3367 * Note: s_es must be initialized as soon as possible because
617ba13b 3368 * some ext4 macro-instructions depend on its value
ac27a0ec 3369 */
2716b802 3370 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3371 sbi->s_es = es;
3372 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3373 if (sb->s_magic != EXT4_SUPER_MAGIC)
3374 goto cantfind_ext4;
afc32f7e 3375 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3376
feb0ab32 3377 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3378 if (ext4_has_feature_metadata_csum(sb) &&
3379 ext4_has_feature_gdt_csum(sb))
363307e6 3380 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3381 "redundant flags; please run fsck.");
3382
d25425f8
DW		 3383 /* Check for a known checksum algorithm */
3384 if (!ext4_verify_csum_type(sb, es)) {
3385 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3386 "unknown checksum algorithm.");
3387 silent = 1;
3388 goto cantfind_ext4;
3389 }
3390
0441984a 3391 /* Load the checksum driver */
e2b911c5 3392 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3393 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3394 if (IS_ERR(sbi->s_chksum_driver)) {
3395 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3396 ret = PTR_ERR(sbi->s_chksum_driver);
3397 sbi->s_chksum_driver = NULL;
3398 goto failed_mount;
3399 }
3400 }
3401
a9c47317
DW		 3402 /* Check superblock checksum */
3403 if (!ext4_superblock_csum_verify(sb, es)) {
3404 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3405 "invalid superblock checksum. Run e2fsck?");
3406 silent = 1;
6a797d27 3407 ret = -EFSBADCRC;
a9c47317
DW		 3408 goto cantfind_ext4;
3409 }
3410
3411 /* Precompute checksum seed for all metadata */
e2b911c5 3412 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3413 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3414 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3415 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3416 sizeof(es->s_uuid));
3417
ac27a0ec
DK		 3418 /* Set defaults before we parse the mount options */
3419 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3420 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3421 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3422 set_opt(sb, DEBUG);
87f26807 3423 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3424 set_opt(sb, GRPID);
617ba13b 3425 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3426 set_opt(sb, NO_UID32);
ea663336 3427 /* xattr user namespace & acls are now defaulted on */
ea663336 3428 set_opt(sb, XATTR_USER);
03010a33 3429#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3430 set_opt(sb, POSIX_ACL);
2e7842b8 3431#endif
98c1a759
DW		 3432 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3433 if (ext4_has_metadata_csum(sb))
3434 set_opt(sb, JOURNAL_CHECKSUM);
3435
617ba13b 3436 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3437 set_opt(sb, JOURNAL_DATA);
617ba13b 3438 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3439 set_opt(sb, ORDERED_DATA);
617ba13b 3440 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3441 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3442
3443 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3444 set_opt(sb, ERRORS_PANIC);
bb4f397a 3445 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3446 set_opt(sb, ERRORS_CONT);
bb4f397a 3447 else
fd8c37ec 3448 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3449 /* block_validity enabled by default; disable with noblock_validity */
3450 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3451 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3452 set_opt(sb, DISCARD);
ac27a0ec 3453
08cefc7a
EB		 3454 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3455 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3456 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3457 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3458 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3459
8b67f04a 3460 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3461 set_opt(sb, BARRIER);
ac27a0ec 3462
dd919b98
AK		 3463 /*
3464 * enable delayed allocation by default
3465 * Use -o nodelalloc to turn it off
3466 */
bc0b75f7 3467 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3468 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3469 set_opt(sb, DELALLOC);
dd919b98 3470
51ce6511
LC		 3471 /*
3472 * set default s_li_wait_mult for lazyinit, for the case there is
3473 * no mount option specified.
3474 */
3475 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3476
8b67f04a 3477 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3478 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3479 ext4_msg(sb, KERN_WARNING,
3480 "failed to parse options in superblock: %s",
3481 sbi->s_es->s_mount_opts);
3482 }
5a916be1 3483 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3484 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3485 &journal_ioprio, 0))
ac27a0ec
DK		 3486 goto failed_mount;
3487
56889787
TT		 3488 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3489 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3490 "with data=journal disables delayed "
3491 "allocation and O_DIRECT support!\n");
3492 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3493 ext4_msg(sb, KERN_ERR, "can't mount with "
3494 "both data=journal and delalloc");
3495 goto failed_mount;
3496 }
3497 if (test_opt(sb, DIOREAD_NOLOCK)) {
3498 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3499 "both data=journal and dioread_nolock");
56889787
TT		 3500 goto failed_mount;
3501 }
923ae0ff
RZ		 3502 if (test_opt(sb, DAX)) {
3503 ext4_msg(sb, KERN_ERR, "can't mount with "
3504 "both data=journal and dax");
3505 goto failed_mount;
3506 }
56889787
TT		 3507 if (test_opt(sb, DELALLOC))
3508 clear_opt(sb, DELALLOC);
001e4a87
TH		 3509 } else {
3510 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3511 }
3512
ac27a0ec 3513 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3514 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3515
617ba13b 3516 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3517 (ext4_has_compat_features(sb) ||
3518 ext4_has_ro_compat_features(sb) ||
3519 ext4_has_incompat_features(sb)))
b31e1552
ES		 3520 ext4_msg(sb, KERN_WARNING,
3521 "feature flags set on rev 0 fs, "
3522 "running e2fsck is recommended");
469108ff 3523
ed3654eb
TT		 3524 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3525 set_opt2(sb, HURD_COMPAT);
e2b911c5 3526 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3527 ext4_msg(sb, KERN_ERR,
3528 "The Hurd can't support 64-bit file systems");
3529 goto failed_mount;
3530 }
3531 }
3532
2035e776
TT		 3533 if (IS_EXT2_SB(sb)) {
3534 if (ext2_feature_set_ok(sb))
3535 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3536 "using the ext4 subsystem");
3537 else {
3538 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3539 "to feature incompatibilities");
3540 goto failed_mount;
3541 }
3542 }
3543
3544 if (IS_EXT3_SB(sb)) {
3545 if (ext3_feature_set_ok(sb))
3546 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3547 "using the ext4 subsystem");
3548 else {
3549 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3550 "to feature incompatibilities");
3551 goto failed_mount;
3552 }
3553 }
3554
ac27a0ec
DK		 3555 /*
3556 * Check feature flags regardless of the revision level, since we
3557 * previously didn't change the revision level when setting the flags,
3558 * so there is a chance incompat flags are set on a rev 0 filesystem.
3559 */
a13fb1a4 3560 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3561 goto failed_mount;
a13fb1a4 3562
261cb20c 3563 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3564 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3565 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3566 ext4_msg(sb, KERN_ERR,
3567 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3568 goto failed_mount;
3569 }
3570
5b9554dc
TT		 3571 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3572 ext4_msg(sb, KERN_ERR,
3573 "Number of reserved GDT blocks insanely large: %d",
3574 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3575 goto failed_mount;
3576 }
3577
923ae0ff 3578 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
87eefeb4
TK		 3579 err = bdev_dax_supported(sb, blocksize);
3580 if (err)
923ae0ff 3581 goto failed_mount;
923ae0ff
RZ		 3582 }
3583
e2b911c5 3584 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3585 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3586 es->s_encryption_level);
3587 goto failed_mount;
3588 }
3589
ac27a0ec 3590 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3591 /* Validate the filesystem blocksize */
3592 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3593 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3594 blocksize);
ac27a0ec
DK		 3595 goto failed_mount;
3596 }
3597
2b2d6d01 3598 brelse(bh);
70bbb3e0
AM		 3599 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3600 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3601 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3602 if (!bh) {
b31e1552
ES		 3603 ext4_msg(sb, KERN_ERR,
3604 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3605 goto failed_mount;
3606 }
2716b802 3607 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3608 sbi->s_es = es;
617ba13b 3609 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3610 ext4_msg(sb, KERN_ERR,
3611 "Magic mismatch, very weird!");
ac27a0ec
DK		 3612 goto failed_mount;
3613 }
3614 }
3615
e2b911c5 3616 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3617 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3618 has_huge_files);
3619 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3620
617ba13b
MC		 3621 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3622 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3623 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3624 } else {
3625 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3626 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3627 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3628 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3629 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3630 ext4_msg(sb, KERN_ERR,
3631 "unsupported inode size: %d",
2b2d6d01 3632 sbi->s_inode_size);
ac27a0ec
DK		 3633 goto failed_mount;
3634 }
ef7f3835
KS		 3635 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3636 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3637 }
0b8e58a1 3638
0d1ee42f 3639 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3640 if (ext4_has_feature_64bit(sb)) {
8fadc143 3641 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3642 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3643 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3644 ext4_msg(sb, KERN_ERR,
3645 "unsupported descriptor size %lu",
0d1ee42f
AR		 3646 sbi->s_desc_size);
3647 goto failed_mount;
3648 }
3649 } else
3650 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3651
ac27a0ec 3652 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3653 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3654 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3655 goto cantfind_ext4;
0b8e58a1 3656
617ba13b 3657 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3658 if (sbi->s_inodes_per_block == 0)
617ba13b 3659 goto cantfind_ext4;
ac27a0ec
DK		 3660 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3661 sbi->s_inodes_per_block;
0d1ee42f 3662 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3663 sbi->s_sbh = bh;
3664 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3665 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3666 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3667
2b2d6d01 3668 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3669 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3670 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3671 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3672 i = le32_to_cpu(es->s_flags);
3673 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3674 sbi->s_hash_unsigned = 3;
3675 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3676#ifdef __CHAR_UNSIGNED__
23301410
TT		 3677 if (!(sb->s_flags & MS_RDONLY))
3678 es->s_flags |=
3679 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3680 sbi->s_hash_unsigned = 3;
f99b2589 3681#else
23301410
TT		 3682 if (!(sb->s_flags & MS_RDONLY))
3683 es->s_flags |=
3684 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3685#endif
23301410 3686 }
f99b2589 3687 }
ac27a0ec 3688
281b5995
TT		 3689 /* Handle clustersize */
3690 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3691 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3692 if (has_bigalloc) {
3693 if (clustersize < blocksize) {
3694 ext4_msg(sb, KERN_ERR,
3695 "cluster size (%d) smaller than "
3696 "block size (%d)", clustersize, blocksize);
3697 goto failed_mount;
3698 }
3699 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3700 le32_to_cpu(es->s_log_block_size);
3701 sbi->s_clusters_per_group =
3702 le32_to_cpu(es->s_clusters_per_group);
3703 if (sbi->s_clusters_per_group > blocksize * 8) {
3704 ext4_msg(sb, KERN_ERR,
3705 "#clusters per group too big: %lu",
3706 sbi->s_clusters_per_group);
3707 goto failed_mount;
3708 }
3709 if (sbi->s_blocks_per_group !=
3710 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3711 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3712 "clusters per group (%lu) inconsistent",
3713 sbi->s_blocks_per_group,
3714 sbi->s_clusters_per_group);
3715 goto failed_mount;
3716 }
3717 } else {
3718 if (clustersize != blocksize) {
3719 ext4_warning(sb, "fragment/cluster size (%d) != "
3720 "block size (%d)", clustersize,
3721 blocksize);
3722 clustersize = blocksize;
3723 }
3724 if (sbi->s_blocks_per_group > blocksize * 8) {
3725 ext4_msg(sb, KERN_ERR,
3726 "#blocks per group too big: %lu",
3727 sbi->s_blocks_per_group);
3728 goto failed_mount;
3729 }
3730 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3731 sbi->s_cluster_bits = 0;
ac27a0ec 3732 }
281b5995
TT		 3733 sbi->s_cluster_ratio = clustersize / blocksize;
3734
ac27a0ec 3735 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3736 ext4_msg(sb, KERN_ERR,
3737 "#inodes per group too big: %lu",
2b2d6d01 3738 sbi->s_inodes_per_group);
ac27a0ec
DK		 3739 goto failed_mount;
3740 }
3741
960fd856
TT		 3742 /* Do we have standard group size of clustersize * 8 blocks ? */
3743 if (sbi->s_blocks_per_group == clustersize << 3)
3744 set_opt2(sb, STD_GROUP_SIZE);
3745
bf43d84b
ES		 3746 /*
3747 * Test whether we have more sectors than will fit in sector_t,
3748 * and whether the max offset is addressable by the page cache.
3749 */
5a9ae68a 3750 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3751 ext4_blocks_count(es));
5a9ae68a 3752 if (err) {
b31e1552 3753 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3754 " too large to mount safely on this system");
ac27a0ec 3755 if (sizeof(sector_t) < 8)
90c699a9 3756 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3757 goto failed_mount;
3758 }
3759
617ba13b
MC		 3760 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3761 goto cantfind_ext4;
e7c95593 3762
0f2ddca6
FTN		 3763 /* check blocks count against device size */
3764 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3765 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3766 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3767 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3768 ext4_blocks_count(es), blocks_count);
3769 goto failed_mount;
3770 }
3771
0b8e58a1
AD		 3772 /*
3773 * It makes no sense for the first data block to be beyond the end
3774 * of the filesystem.
3775 */
3776 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3777 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3778 "block %u is beyond end of filesystem (%llu)",
3779 le32_to_cpu(es->s_first_data_block),
3780 ext4_blocks_count(es));
e7c95593
ES		 3781 goto failed_mount;
3782 }
bd81d8ee
LV		 3783 blocks_count = (ext4_blocks_count(es) -
3784 le32_to_cpu(es->s_first_data_block) +
3785 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3786 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3787 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3788 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3789 "(block count %llu, first data block %u, "
b31e1552 3790 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3791 ext4_blocks_count(es),
3792 le32_to_cpu(es->s_first_data_block),
3793 EXT4_BLOCKS_PER_GROUP(sb));
3794 goto failed_mount;
3795 }
bd81d8ee 3796 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3797 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3798 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3799 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3800 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3801 sbi->s_group_desc = ext4_kvmalloc(db_count *
3802 sizeof(struct buffer_head *),
3803 GFP_KERNEL);
ac27a0ec 3804 if (sbi->s_group_desc == NULL) {
b31e1552 3805 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3806 ret = -ENOMEM;
ac27a0ec
DK		 3807 goto failed_mount;
3808 }
3809
705895b6 3810 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3811
3812 for (i = 0; i < db_count; i++) {
70bbb3e0 3813 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3814 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3815 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3816 ext4_msg(sb, KERN_ERR,
3817 "can't read group descriptor %d", i);
ac27a0ec
DK		 3818 db_count = i;
3819 goto failed_mount2;
3820 }
3821 }
829fa70d 3822 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 3823 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3824 ret = -EFSCORRUPTED;
f9ae9cf5 3825 goto failed_mount2;
ac27a0ec 3826 }
772cb7c8 3827
f9ae9cf5 3828 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3829 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3830 spin_lock_init(&sbi->s_next_gen_lock);
3831
04ecddb7
JM		 3832 setup_timer(&sbi->s_err_report, print_daily_error_info,
3833 (unsigned long) sb);
04496411 3834
a75ae78f 3835 /* Register extent status tree shrinker */
eb68d0e2 3836 if (ext4_es_register_shrinker(sbi))
ce7e010a 3837 goto failed_mount3;
ce7e010a 3838
c9de560d 3839 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3840 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3841
f9ae9cf5
TT		 3842 /*
3843 * set up enough so that it can read an inode
3844 */
f6e63f90 3845 sb->s_op = &ext4_sops;
617ba13b
MC		 3846 sb->s_export_op = &ext4_export_ops;
3847 sb->s_xattr = ext4_xattr_handlers;
a7550b30 3848 sb->s_cop = &ext4_cryptops;
ac27a0ec 3849#ifdef CONFIG_QUOTA
617ba13b 3850 sb->dq_op = &ext4_quota_operations;
e2b911c5 3851 if (ext4_has_feature_quota(sb))
1fa5efe3 3852 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3853 else
3854 sb->s_qcop = &ext4_qctl_operations;
689c958c 3855 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 3856#endif
f2fa2ffc
AK		 3857 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3858
ac27a0ec 3859 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3860 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3861
3862 sb->s_root = NULL;
3863
3864 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3865 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3866
e2b911c5 3867 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3868 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3869 goto failed_mount3a;
c5e06d10 3870
ac27a0ec
DK		 3871 /*
3872 * The first inode we look at is the journal inode. Don't try
3873 * root first: it may be modified in the journal!
3874 */
e2b911c5 3875 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3876 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3877 goto failed_mount3a;
0390131b 3878 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3879 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3880 ext4_msg(sb, KERN_ERR, "required journal recovery "
3881 "suppressed and not mounted read-only");
744692dc 3882 goto failed_mount_wq;
ac27a0ec 3883 } else {
1e381f60
DM		 3884 /* Nojournal mode, all journal mount options are illegal */
3885 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3886 ext4_msg(sb, KERN_ERR, "can't mount with "
3887 "journal_checksum, fs mounted w/o journal");
3888 goto failed_mount_wq;
3889 }
3890 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3891 ext4_msg(sb, KERN_ERR, "can't mount with "
3892 "journal_async_commit, fs mounted w/o journal");
3893 goto failed_mount_wq;
3894 }
3895 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3896 ext4_msg(sb, KERN_ERR, "can't mount with "
3897 "commit=%lu, fs mounted w/o journal",
3898 sbi->s_commit_interval / HZ);
3899 goto failed_mount_wq;
3900 }
3901 if (EXT4_MOUNT_DATA_FLAGS &
3902 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3903 ext4_msg(sb, KERN_ERR, "can't mount with "
3904 "data=, fs mounted w/o journal");
3905 goto failed_mount_wq;
3906 }
3907 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3908 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3909 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3910 sbi->s_journal = NULL;
3911 needs_recovery = 0;
3912 goto no_journal;
ac27a0ec
DK		 3913 }
3914
e2b911c5 3915 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3916 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3917 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3918 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3919 goto failed_mount_wq;
eb40a09c
JS		 3920 }
3921
25ed6e8a
DW		 3922 if (!set_journal_csum_feature_set(sb)) {
3923 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3924 "feature set");
3925 goto failed_mount_wq;
d4da6c9c 3926 }
818d276c 3927
ac27a0ec
DK		 3928 /* We have now updated the journal if required, so we can
3929 * validate the data journaling mode. */
3930 switch (test_opt(sb, DATA_FLAGS)) {
3931 case 0:
3932 /* No mode set, assume a default based on the journal
63f57933
AM		 3933 * capabilities: ORDERED_DATA if the journal can
3934 * cope, else JOURNAL_DATA
3935 */
dab291af
MC		 3936 if (jbd2_journal_check_available_features
3937 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3938 set_opt(sb, ORDERED_DATA);
ac27a0ec 3939 else
fd8c37ec 3940 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3941 break;
3942
617ba13b
MC		 3943 case EXT4_MOUNT_ORDERED_DATA:
3944 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3945 if (!jbd2_journal_check_available_features
3946 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3947 ext4_msg(sb, KERN_ERR, "Journal does not support "
3948 "requested data journaling mode");
744692dc 3949 goto failed_mount_wq;
ac27a0ec
DK		 3950 }
3951 default:
3952 break;
3953 }
b3881f74 3954 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3955
18aadd47
BJ		 3956 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3957
ce7e010a 3958no_journal:
2335d05f
AG		 3959 sbi->s_mb_cache = ext4_xattr_create_cache();
3960 if (!sbi->s_mb_cache) {
3961 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3962 goto failed_mount_wq;
9c191f70
M		 3963 }
3964
e2b911c5 3965 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 3966 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 3967 ext4_msg(sb, KERN_ERR,
3968 "Unsupported blocksize for fs encryption");
3969 goto failed_mount_wq;
3970 }
3971
e2b911c5
DW		 3972 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3973 !ext4_has_feature_encrypt(sb)) {
3974 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3975 ext4_commit_super(sb, 1);
3976 }
3977
952fc18e
TT		 3978 /*
3979 * Get the # of file system overhead blocks from the
3980 * superblock if present.
3981 */
3982 if (es->s_overhead_clusters)
3983 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3984 else {
07aa2ea1
LC		 3985 err = ext4_calculate_overhead(sb);
3986 if (err)
952fc18e
TT		 3987 goto failed_mount_wq;
3988 }
3989
fd89d5f2
TH		 3990 /*
3991 * The maximum number of concurrent works can be high and
3992 * concurrency isn't really necessary. Limit it to 1.
3993 */
2e8fa54e
JK		 3994 EXT4_SB(sb)->rsv_conversion_wq =
3995 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3996 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3997 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3998 ret = -ENOMEM;
2e8fa54e
JK		 3999 goto failed_mount4;
4000 }
4001
ac27a0ec 4002 /*
dab291af 4003 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4004 * so we can safely mount the rest of the filesystem now.
4005 */
4006
1d1fe1ee
DH		 4007 root = ext4_iget(sb, EXT4_ROOT_INO);
4008 if (IS_ERR(root)) {
b31e1552 4009 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4010 ret = PTR_ERR(root);
32a9bb57 4011 root = NULL;
ac27a0ec
DK		 4012 goto failed_mount4;
4013 }
4014 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4015 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4016 iput(root);
ac27a0ec
DK		 4017 goto failed_mount4;
4018 }
48fde701 4019 sb->s_root = d_make_root(root);
1d1fe1ee 4020 if (!sb->s_root) {
b31e1552 4021 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4022 ret = -ENOMEM;
4023 goto failed_mount4;
4024 }
ac27a0ec 4025
7e84b621
ES		 4026 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4027 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4028
4029 /* determine the minimum size of new large inodes, if present */
4030 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4031 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4032 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 4033 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 4034 if (sbi->s_want_extra_isize <
4035 le16_to_cpu(es->s_want_extra_isize))
4036 sbi->s_want_extra_isize =
4037 le16_to_cpu(es->s_want_extra_isize);
4038 if (sbi->s_want_extra_isize <
4039 le16_to_cpu(es->s_min_extra_isize))
4040 sbi->s_want_extra_isize =
4041 le16_to_cpu(es->s_min_extra_isize);
4042 }
4043 }
4044 /* Check if enough inode space is available */
4045 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4046 sbi->s_inode_size) {
4047 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4048 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4049 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4050 "available");
ef7f3835
KS		 4051 }
4052
b5799018 4053 ext4_set_resv_clusters(sb);
27dd4385 4054
6fd058f7
TT		 4055 err = ext4_setup_system_zone(sb);
4056 if (err) {
b31e1552 4057 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4058 "zone (%d)", err);
f9ae9cf5
TT		 4059 goto failed_mount4a;
4060 }
4061
4062 ext4_ext_init(sb);
4063 err = ext4_mb_init(sb);
4064 if (err) {
4065 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4066 err);
dcf2d804 4067 goto failed_mount5;
c2774d84
AK		 4068 }
4069
d5e03cbb
TT		 4070 block = ext4_count_free_clusters(sb);
4071 ext4_free_blocks_count_set(sbi->s_es,
4072 EXT4_C2B(sbi, block));
908c7f19
TH		 4073 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4074 GFP_KERNEL);
d5e03cbb
TT		 4075 if (!err) {
4076 unsigned long freei = ext4_count_free_inodes(sb);
4077 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4078 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4079 GFP_KERNEL);
d5e03cbb
TT		 4080 }
4081 if (!err)
4082 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4083 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4084 if (!err)
908c7f19
TH		 4085 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4086 GFP_KERNEL);
c8585c6f
DJ		 4087 if (!err)
4088 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4089
d5e03cbb
TT		 4090 if (err) {
4091 ext4_msg(sb, KERN_ERR, "insufficient memory");
4092 goto failed_mount6;
4093 }
4094
e2b911c5 4095 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4096 if (!ext4_fill_flex_info(sb)) {
4097 ext4_msg(sb, KERN_ERR,
4098 "unable to initialize "
4099 "flex_bg meta info!");
4100 goto failed_mount6;
4101 }
4102
bfff6873
LC		 4103 err = ext4_register_li_request(sb, first_not_zeroed);
4104 if (err)
dcf2d804 4105 goto failed_mount6;
bfff6873 4106
b5799018 4107 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4108 if (err)
4109 goto failed_mount7;
3197ebdb 4110
9b2ff357
JK		 4111#ifdef CONFIG_QUOTA
4112 /* Enable quota usage during mount. */
e2b911c5 4113 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 4114 err = ext4_enable_quotas(sb);
4115 if (err)
4116 goto failed_mount8;
4117 }
4118#endif /* CONFIG_QUOTA */
4119
617ba13b
MC		 4120 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4121 ext4_orphan_cleanup(sb, es);
4122 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4123 if (needs_recovery) {
b31e1552 4124 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4125 ext4_mark_recovery_complete(sb, es);
4126 }
4127 if (EXT4_SB(sb)->s_journal) {
4128 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4129 descr = " journalled data mode";
4130 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4131 descr = " ordered data mode";
4132 else
4133 descr = " writeback data mode";
4134 } else
4135 descr = "out journal";
4136
79add3a3
LC		 4137 if (test_opt(sb, DISCARD)) {
4138 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4139 if (!blk_queue_discard(q))
4140 ext4_msg(sb, KERN_WARNING,
4141 "mounting with \"discard\" option, but "
4142 "the device does not support discard");
4143 }
4144
e294a537
TT		 4145 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4146 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4147 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4148 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4149
66e61a9e
TT		 4150 if (es->s_error_count)
4151 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4152
efbed4dc
TT		 4153 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4154 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4155 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4156 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4157
d4c402d9 4158 kfree(orig_data);
a7550b30
JK		 4159#ifdef CONFIG_EXT4_FS_ENCRYPTION
4160 memcpy(sbi->key_prefix, EXT4_KEY_DESC_PREFIX,
4161 EXT4_KEY_DESC_PREFIX_SIZE);
4162 sbi->key_prefix_size = EXT4_KEY_DESC_PREFIX_SIZE;
4163#endif
ac27a0ec
DK		 4164 return 0;
4165
617ba13b 4166cantfind_ext4:
ac27a0ec 4167 if (!silent)
b31e1552 4168 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4169 goto failed_mount;
4170
72ba7450
TT		 4171#ifdef CONFIG_QUOTA
4172failed_mount8:
ebd173be 4173 ext4_unregister_sysfs(sb);
72ba7450 4174#endif
dcf2d804
TM		 4175failed_mount7:
4176 ext4_unregister_li_request(sb);
4177failed_mount6:
f9ae9cf5 4178 ext4_mb_release(sb);
d5e03cbb 4179 if (sbi->s_flex_groups)
b93b41d4 4180 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4181 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4182 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4183 percpu_counter_destroy(&sbi->s_dirs_counter);
4184 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4185failed_mount5:
f9ae9cf5
TT		 4186 ext4_ext_release(sb);
4187 ext4_release_system_zone(sb);
4188failed_mount4a:
94bf608a 4189 dput(sb->s_root);
32a9bb57 4190 sb->s_root = NULL;
94bf608a 4191failed_mount4:
b31e1552 4192 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4193 if (EXT4_SB(sb)->rsv_conversion_wq)
4194 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4195failed_mount_wq:
82939d79
JK		 4196 if (sbi->s_mb_cache) {
4197 ext4_xattr_destroy_cache(sbi->s_mb_cache);
4198 sbi->s_mb_cache = NULL;
4199 }
0390131b
FM		 4200 if (sbi->s_journal) {
4201 jbd2_journal_destroy(sbi->s_journal);
4202 sbi->s_journal = NULL;
4203 }
50460fe8 4204failed_mount3a:
d3922a77 4205 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4206failed_mount3:
9105bb14 4207 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4208 if (sbi->s_mmp_tsk)
4209 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4210failed_mount2:
4211 for (i = 0; i < db_count; i++)
4212 brelse(sbi->s_group_desc[i]);
b93b41d4 4213 kvfree(sbi->s_group_desc);
ac27a0ec 4214failed_mount:
0441984a
DW		 4215 if (sbi->s_chksum_driver)
4216 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4217#ifdef CONFIG_QUOTA
a2d4a646 4218 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4219 kfree(sbi->s_qf_names[i]);
4220#endif
617ba13b 4221 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4222 brelse(bh);
4223out_fail:
4224 sb->s_fs_info = NULL;
f6830165 4225 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4226 kfree(sbi);
dcc7dae3 4227out_free_orig:
d4c402d9 4228 kfree(orig_data);
07aa2ea1 4229 return err ? err : ret;
ac27a0ec
DK		 4230}
4231
4232/*
4233 * Setup any per-fs journal parameters now. We'll do this both on
4234 * initial mount, once the journal has been initialised but before we've
4235 * done any recovery; and again on any subsequent remount.
4236 */
617ba13b 4237static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4238{
617ba13b 4239 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4240
30773840
TT		 4241 journal->j_commit_interval = sbi->s_commit_interval;
4242 journal->j_min_batch_time = sbi->s_min_batch_time;
4243 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4244
a931da6a 4245 write_lock(&journal->j_state_lock);
ac27a0ec 4246 if (test_opt(sb, BARRIER))
dab291af 4247 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4248 else
dab291af 4249 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4250 if (test_opt(sb, DATA_ERR_ABORT))
4251 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4252 else
4253 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4254 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4255}
4256
c6cb7e77
EW		 4257static struct inode *ext4_get_journal_inode(struct super_block *sb,
4258 unsigned int journal_inum)
ac27a0ec
DK		 4259{
4260 struct inode *journal_inode;
ac27a0ec 4261
c6cb7e77
EW		 4262 /*
4263 * Test for the existence of a valid inode on disk. Bad things
4264 * happen if we iget() an unused inode, as the subsequent iput()
4265 * will try to delete it.
4266 */
1d1fe1ee
DH		 4267 journal_inode = ext4_iget(sb, journal_inum);
4268 if (IS_ERR(journal_inode)) {
b31e1552 4269 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4270 return NULL;
4271 }
4272 if (!journal_inode->i_nlink) {
4273 make_bad_inode(journal_inode);
4274 iput(journal_inode);
b31e1552 4275 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4276 return NULL;
4277 }
4278
e5f8eab8 4279 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4280 journal_inode, journal_inode->i_size);
1d1fe1ee 4281 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4282 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4283 iput(journal_inode);
4284 return NULL;
4285 }
c6cb7e77
EW		 4286 return journal_inode;
4287}
4288
4289static journal_t *ext4_get_journal(struct super_block *sb,
4290 unsigned int journal_inum)
4291{
4292 struct inode *journal_inode;
4293 journal_t *journal;
4294
4295 BUG_ON(!ext4_has_feature_journal(sb));
4296
4297 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4298 if (!journal_inode)
4299 return NULL;
ac27a0ec 4300
dab291af 4301 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4302 if (!journal) {
b31e1552 4303 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4304 iput(journal_inode);
4305 return NULL;
4306 }
4307 journal->j_private = sb;
617ba13b 4308 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4309 return journal;
4310}
4311
617ba13b 4312static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4313 dev_t j_dev)
4314{
2b2d6d01 4315 struct buffer_head *bh;
ac27a0ec 4316 journal_t *journal;
617ba13b
MC		 4317 ext4_fsblk_t start;
4318 ext4_fsblk_t len;
ac27a0ec 4319 int hblock, blocksize;
617ba13b 4320 ext4_fsblk_t sb_block;
ac27a0ec 4321 unsigned long offset;
2b2d6d01 4322 struct ext4_super_block *es;
ac27a0ec
DK		 4323 struct block_device *bdev;
4324
e2b911c5 4325 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4326
b31e1552 4327 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4328 if (bdev == NULL)
4329 return NULL;
4330
ac27a0ec 4331 blocksize = sb->s_blocksize;
e1defc4f 4332 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4333 if (blocksize < hblock) {
b31e1552
ES		 4334 ext4_msg(sb, KERN_ERR,
4335 "blocksize too small for journal device");
ac27a0ec
DK		 4336 goto out_bdev;
4337 }
4338
617ba13b
MC		 4339 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4340 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4341 set_blocksize(bdev, blocksize);
4342 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4343 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4344 "external journal");
ac27a0ec
DK		 4345 goto out_bdev;
4346 }
4347
2716b802 4348 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4349 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4350 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4351 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4352 ext4_msg(sb, KERN_ERR, "external journal has "
4353 "bad superblock");
ac27a0ec
DK		 4354 brelse(bh);
4355 goto out_bdev;
4356 }
4357
df4763be
DW		 4358 if ((le32_to_cpu(es->s_feature_ro_compat) &
4359 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4360 es->s_checksum != ext4_superblock_csum(sb, es)) {
4361 ext4_msg(sb, KERN_ERR, "external journal has "
4362 "corrupt superblock");
4363 brelse(bh);
4364 goto out_bdev;
4365 }
4366
617ba13b 4367 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4368 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4369 brelse(bh);
4370 goto out_bdev;
4371 }
4372
bd81d8ee 4373 len = ext4_blocks_count(es);
ac27a0ec
DK		 4374 start = sb_block + 1;
4375 brelse(bh); /* we're done with the superblock */
4376
dab291af 4377 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4378 start, len, blocksize);
4379 if (!journal) {
b31e1552 4380 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4381 goto out_bdev;
4382 }
4383 journal->j_private = sb;
dfec8a14 4384 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4385 wait_on_buffer(journal->j_sb_buffer);
4386 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4387 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4388 goto out_journal;
4389 }
4390 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4391 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4392 "user (unsupported) - %d",
ac27a0ec
DK		 4393 be32_to_cpu(journal->j_superblock->s_nr_users));
4394 goto out_journal;
4395 }
617ba13b
MC		 4396 EXT4_SB(sb)->journal_bdev = bdev;
4397 ext4_init_journal_params(sb, journal);
ac27a0ec 4398 return journal;
0b8e58a1 4399
ac27a0ec 4400out_journal:
dab291af 4401 jbd2_journal_destroy(journal);
ac27a0ec 4402out_bdev:
617ba13b 4403 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4404 return NULL;
4405}
4406
617ba13b
MC		 4407static int ext4_load_journal(struct super_block *sb,
4408 struct ext4_super_block *es,
ac27a0ec
DK		 4409 unsigned long journal_devnum)
4410{
4411 journal_t *journal;
4412 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4413 dev_t journal_dev;
4414 int err = 0;
4415 int really_read_only;
4416
e2b911c5 4417 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4418
ac27a0ec
DK		 4419 if (journal_devnum &&
4420 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4421 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4422 "numbers have changed");
ac27a0ec
DK		 4423 journal_dev = new_decode_dev(journal_devnum);
4424 } else
4425 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4426
4427 really_read_only = bdev_read_only(sb->s_bdev);
4428
4429 /*
4430 * Are we loading a blank journal or performing recovery after a
4431 * crash? For recovery, we need to check in advance whether we
4432 * can get read-write access to the device.
4433 */
e2b911c5 4434 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4435 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4436 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4437 "required on readonly filesystem");
ac27a0ec 4438 if (really_read_only) {
b31e1552
ES		 4439 ext4_msg(sb, KERN_ERR, "write access "
4440 "unavailable, cannot proceed");
ac27a0ec
DK		 4441 return -EROFS;
4442 }
b31e1552
ES		 4443 ext4_msg(sb, KERN_INFO, "write access will "
4444 "be enabled during recovery");
ac27a0ec
DK		 4445 }
4446 }
4447
4448 if (journal_inum && journal_dev) {
b31e1552
ES		 4449 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4450 "and inode journals!");
ac27a0ec
DK		 4451 return -EINVAL;
4452 }
4453
4454 if (journal_inum) {
617ba13b 4455 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4456 return -EINVAL;
4457 } else {
617ba13b 4458 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4459 return -EINVAL;
4460 }
4461
90576c0b 4462 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4463 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4464
e2b911c5 4465 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4466 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4467 if (!err) {
4468 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4469 if (save)
4470 memcpy(save, ((char *) es) +
4471 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4472 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4473 if (save)
4474 memcpy(((char *) es) + EXT4_S_ERR_START,
4475 save, EXT4_S_ERR_LEN);
4476 kfree(save);
4477 }
ac27a0ec
DK		 4478
4479 if (err) {
b31e1552 4480 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4481 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4482 return err;
4483 }
4484
617ba13b
MC		 4485 EXT4_SB(sb)->s_journal = journal;
4486 ext4_clear_journal_err(sb, es);
ac27a0ec 4487
c41303ce 4488 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4489 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4490 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4491
4492 /* Make sure we flush the recovery flag to disk. */
e2d67052 4493 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4494 }
4495
4496 return 0;
4497}
4498
e2d67052 4499static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4500{
e2d67052 4501 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4502 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4503 int error = 0;
ac27a0ec 4504
bdfe0cbd 4505 if (!sbh || block_device_ejected(sb))
c4be0c1d 4506 return error;
71290b36
TT		 4507 /*
4508 * If the file system is mounted read-only, don't update the
4509 * superblock write time. This avoids updating the superblock
4510 * write time when we are mounting the root file system
4511 * read/only but we need to replay the journal; at that point,
4512 * for people who are east of GMT and who make their clock
4513 * tick in localtime for Windows bug-for-bug compatibility,
4514 * the clock is set in the future, and this will cause e2fsck
4515 * to complain and force a full file system check.
4516 */
4517 if (!(sb->s_flags & MS_RDONLY))
4518 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4519 if (sb->s_bdev->bd_part)
4520 es->s_kbytes_written =
4521 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4522 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4523 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4524 else
4525 es->s_kbytes_written =
4526 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4527 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4528 ext4_free_blocks_count_set(es,
57042651
TT		 4529 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4530 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4531 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4532 es->s_free_inodes_count =
4533 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4534 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4535 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4536 ext4_superblock_csum_set(sb);
4743f839
PKS		 4537 lock_buffer(sbh);
4538 if (buffer_write_io_error(sbh)) {
4539 /*
4540 * Oh, dear. A previous attempt to write the
4541 * superblock failed. This could happen because the
4542 * USB device was yanked out. Or it could happen to
4543 * be a transient write error and maybe the block will
4544 * be remapped. Nothing we can do but to retry the
4545 * write and hope for the best.
4546 */
4547 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4548 "superblock detected");
4549 clear_buffer_write_io_error(sbh);
4550 set_buffer_uptodate(sbh);
4551 }
ac27a0ec 4552 mark_buffer_dirty(sbh);
4743f839 4553 unlock_buffer(sbh);
914258bf 4554 if (sync) {
564bc402
DJ		 4555 error = __sync_dirty_buffer(sbh,
4556 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4557 if (error)
4558 return error;
4559
4560 error = buffer_write_io_error(sbh);
4561 if (error) {
b31e1552
ES		 4562 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4563 "superblock");
914258bf
TT		 4564 clear_buffer_write_io_error(sbh);
4565 set_buffer_uptodate(sbh);
4566 }
4567 }
c4be0c1d 4568 return error;
ac27a0ec
DK		 4569}
4570
ac27a0ec
DK		 4571/*
4572 * Have we just finished recovery? If so, and if we are mounting (or
4573 * remounting) the filesystem readonly, then we will end up with a
4574 * consistent fs on disk. Record that fact.
4575 */
2b2d6d01
TT		 4576static void ext4_mark_recovery_complete(struct super_block *sb,
4577 struct ext4_super_block *es)
ac27a0ec 4578{
617ba13b 4579 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4580
e2b911c5 4581 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4582 BUG_ON(journal != NULL);
4583 return;
4584 }
dab291af 4585 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4586 if (jbd2_journal_flush(journal) < 0)
4587 goto out;
4588
e2b911c5 4589 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4590 sb->s_flags & MS_RDONLY) {
e2b911c5 4591 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4592 ext4_commit_super(sb, 1);
ac27a0ec 4593 }
7ffe1ea8
HK		 4594
4595out:
dab291af 4596 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4597}
4598
4599/*
4600 * If we are mounting (or read-write remounting) a filesystem whose journal
4601 * has recorded an error from a previous lifetime, move that error to the
4602 * main filesystem now.
4603 */
2b2d6d01
TT		 4604static void ext4_clear_journal_err(struct super_block *sb,
4605 struct ext4_super_block *es)
ac27a0ec
DK		 4606{
4607 journal_t *journal;
4608 int j_errno;
4609 const char *errstr;
4610
e2b911c5 4611 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4612
617ba13b 4613 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4614
4615 /*
4616 * Now check for any error status which may have been recorded in the
617ba13b 4617 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4618 */
4619
dab291af 4620 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4621 if (j_errno) {
4622 char nbuf[16];
4623
617ba13b 4624 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4625 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4626 "from previous mount: %s", errstr);
12062ddd 4627 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4628
617ba13b
MC		 4629 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4630 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4631 ext4_commit_super(sb, 1);
ac27a0ec 4632
dab291af 4633 jbd2_journal_clear_err(journal);
d796c52e 4634 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4635 }
4636}
4637
4638/*
4639 * Force the running and committing transactions to commit,
4640 * and wait on the commit.
4641 */
617ba13b 4642int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4643{
4644 journal_t *journal;
ac27a0ec
DK		 4645
4646 if (sb->s_flags & MS_RDONLY)
4647 return 0;
4648
617ba13b 4649 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4650 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4651}
4652
617ba13b 4653static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4654{
14ce0cb4 4655 int ret = 0;
9eddacf9 4656 tid_t target;
06a407f1 4657 bool needs_barrier = false;
8d5d02e6 4658 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4659
9bffad1e 4660 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4661 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4662 /*
4663 * Writeback quota in non-journalled quota case - journalled quota has
4664 * no dirty dquots
4665 */
4666 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4667 /*
4668 * Data writeback is possible w/o journal transaction, so barrier must
4669 * being sent at the end of the function. But we can skip it if
4670 * transaction_commit will do it for us.
4671 */
bda32530
TT		 4672 if (sbi->s_journal) {
4673 target = jbd2_get_latest_transaction(sbi->s_journal);
4674 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4675 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4676 needs_barrier = true;
4677
4678 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4679 if (wait)
4680 ret = jbd2_log_wait_commit(sbi->s_journal,
4681 target);
4682 }
4683 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4684 needs_barrier = true;
06a407f1
DM		 4685 if (needs_barrier) {
4686 int err;
4687 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4688 if (!ret)
4689 ret = err;
0390131b 4690 }
06a407f1
DM		 4691
4692 return ret;
4693}
4694
ac27a0ec
DK		 4695/*
4696 * LVM calls this function before a (read-only) snapshot is created. This
4697 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4698 *
4699 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4700 * state independently. It relies on upper layer to stop all data & metadata
4701 * modifications.
ac27a0ec 4702 */
c4be0c1d 4703static int ext4_freeze(struct super_block *sb)
ac27a0ec 4704{
c4be0c1d
TS		 4705 int error = 0;
4706 journal_t *journal;
ac27a0ec 4707
9ca92389
TT		 4708 if (sb->s_flags & MS_RDONLY)
4709 return 0;
ac27a0ec 4710
9ca92389 4711 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4712
bb044576
TT		 4713 if (journal) {
4714 /* Now we set up the journal barrier. */
4715 jbd2_journal_lock_updates(journal);
ac27a0ec 4716
bb044576
TT		 4717 /*
4718 * Don't clear the needs_recovery flag if we failed to
4719 * flush the journal.
4720 */
4721 error = jbd2_journal_flush(journal);
4722 if (error < 0)
4723 goto out;
c642dc9e
ES		 4724
4725 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4726 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4727 }
9ca92389 4728
9ca92389 4729 error = ext4_commit_super(sb, 1);
6b0310fb 4730out:
bb044576
TT		 4731 if (journal)
4732 /* we rely on upper layer to stop further updates */
4733 jbd2_journal_unlock_updates(journal);
6b0310fb 4734 return error;
ac27a0ec
DK		 4735}
4736
4737/*
4738 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4739 * flag here, even though the filesystem is not technically dirty yet.
4740 */
c4be0c1d 4741static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4742{
9ca92389
TT		 4743 if (sb->s_flags & MS_RDONLY)
4744 return 0;
4745
c642dc9e
ES		 4746 if (EXT4_SB(sb)->s_journal) {
4747 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4748 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4749 }
4750
9ca92389 4751 ext4_commit_super(sb, 1);
c4be0c1d 4752 return 0;
ac27a0ec
DK		 4753}
4754
673c6100
TT		 4755/*
4756 * Structure to save mount options for ext4_remount's benefit
4757 */
4758struct ext4_mount_options {
4759 unsigned long s_mount_opt;
a2595b8a 4760 unsigned long s_mount_opt2;
08cefc7a
EB		 4761 kuid_t s_resuid;
4762 kgid_t s_resgid;
673c6100
TT		 4763 unsigned long s_commit_interval;
4764 u32 s_min_batch_time, s_max_batch_time;
4765#ifdef CONFIG_QUOTA
4766 int s_jquota_fmt;
a2d4a646 4767 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4768#endif
4769};
4770
2b2d6d01 4771static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4772{
2b2d6d01 4773 struct ext4_super_block *es;
617ba13b 4774 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4775 unsigned long old_sb_flags;
617ba13b 4776 struct ext4_mount_options old_opts;
c79d967d 4777 int enable_quota = 0;
8a266467 4778 ext4_group_t g;
b3881f74 4779 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4780 int err = 0;
ac27a0ec 4781#ifdef CONFIG_QUOTA
03dafb5f 4782 int i, j;
ac27a0ec 4783#endif
d4c402d9 4784 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4785
4786 /* Store the original options */
4787 old_sb_flags = sb->s_flags;
4788 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4789 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4790 old_opts.s_resuid = sbi->s_resuid;
4791 old_opts.s_resgid = sbi->s_resgid;
4792 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4793 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4794 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4795#ifdef CONFIG_QUOTA
4796 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4797 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4798 if (sbi->s_qf_names[i]) {
4799 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4800 GFP_KERNEL);
4801 if (!old_opts.s_qf_names[i]) {
4802 for (j = 0; j < i; j++)
4803 kfree(old_opts.s_qf_names[j]);
3e36a163 4804 kfree(orig_data);
03dafb5f
CG		 4805 return -ENOMEM;
4806 }
4807 } else
4808 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4809#endif
b3881f74
TT		 4810 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4811 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4812
661aa520 4813 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4814 err = -EINVAL;
4815 goto restore_opts;
4816 }
4817
6b992ff2 4818 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4819 test_opt(sb, JOURNAL_CHECKSUM)) {
4820 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4821 "during remount not supported; ignoring");
4822 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4823 }
4824
6ae6514b
PS		 4825 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4826 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4827 ext4_msg(sb, KERN_ERR, "can't mount with "
4828 "both data=journal and delalloc");
4829 err = -EINVAL;
4830 goto restore_opts;
4831 }
4832 if (test_opt(sb, DIOREAD_NOLOCK)) {
4833 ext4_msg(sb, KERN_ERR, "can't mount with "
4834 "both data=journal and dioread_nolock");
4835 err = -EINVAL;
4836 goto restore_opts;
4837 }
923ae0ff
RZ		 4838 if (test_opt(sb, DAX)) {
4839 ext4_msg(sb, KERN_ERR, "can't mount with "
4840 "both data=journal and dax");
4841 err = -EINVAL;
4842 goto restore_opts;
4843 }
4844 }
4845
4846 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4847 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4848 "dax flag with busy inodes while remounting");
4849 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4850 }
4851
4ab2f15b 4852 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4853 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4854
4855 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4856 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4857
4858 es = sbi->s_es;
4859
b3881f74 4860 if (sbi->s_journal) {
0390131b 4861 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4862 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4863 }
ac27a0ec 4864
a2fd66d0
TT		 4865 if (*flags & MS_LAZYTIME)
4866 sb->s_flags |= MS_LAZYTIME;
4867
661aa520 4868 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4869 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4870 err = -EROFS;
4871 goto restore_opts;
4872 }
4873
4874 if (*flags & MS_RDONLY) {
38c03b34
TT		 4875 err = sync_filesystem(sb);
4876 if (err < 0)
4877 goto restore_opts;
0f0dd62f
CH		 4878 err = dquot_suspend(sb, -1);
4879 if (err < 0)
c79d967d 4880 goto restore_opts;
c79d967d 4881
ac27a0ec
DK		 4882 /*
4883 * First of all, the unconditional stuff we have to do
4884 * to disable replay of the journal when we next remount
4885 */
4886 sb->s_flags |= MS_RDONLY;
4887
4888 /*
4889 * OK, test if we are remounting a valid rw partition
4890 * readonly, and if so set the rdonly flag and then
4891 * mark the partition as valid again.
4892 */
617ba13b
MC		 4893 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4894 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4895 es->s_state = cpu_to_le16(sbi->s_mount_state);
4896
a63c9eb2 4897 if (sbi->s_journal)
0390131b 4898 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4899 } else {
a13fb1a4 4900 /* Make sure we can mount this feature set readwrite */
e2b911c5 4901 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4902 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4903 err = -EROFS;
4904 goto restore_opts;
4905 }
8a266467
TT		 4906 /*
4907 * Make sure the group descriptor checksums
0b8e58a1 4908 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4909 */
4910 for (g = 0; g < sbi->s_groups_count; g++) {
4911 struct ext4_group_desc *gdp =
4912 ext4_get_group_desc(sb, g, NULL);
4913
feb0ab32 4914 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4915 ext4_msg(sb, KERN_ERR,
4916 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4917 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4918 le16_to_cpu(gdp->bg_checksum));
6a797d27 4919 err = -EFSBADCRC;
8a266467
TT		 4920 goto restore_opts;
4921 }
4922 }
4923
ead6596b
ES		 4924 /*
4925 * If we have an unprocessed orphan list hanging
4926 * around from a previously readonly bdev mount,
4927 * require a full umount/remount for now.
4928 */
4929 if (es->s_last_orphan) {
b31e1552 4930 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4931 "remount RDWR because of unprocessed "
4932 "orphan inode list. Please "
b31e1552 4933 "umount/remount instead");
ead6596b
ES		 4934 err = -EINVAL;
4935 goto restore_opts;
4936 }
4937
ac27a0ec
DK		 4938 /*
4939 * Mounting a RDONLY partition read-write, so reread
4940 * and store the current valid flag. (It may have
4941 * been changed by e2fsck since we originally mounted
4942 * the partition.)
4943 */
0390131b
FM		 4944 if (sbi->s_journal)
4945 ext4_clear_journal_err(sb, es);
ac27a0ec 4946 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4947 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4948 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4949 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4950 if (ext4_multi_mount_protect(sb,
4951 le64_to_cpu(es->s_mmp_block))) {
4952 err = -EROFS;
4953 goto restore_opts;
4954 }
c79d967d 4955 enable_quota = 1;
ac27a0ec
DK		 4956 }
4957 }
bfff6873
LC		 4958
4959 /*
4960 * Reinitialize lazy itable initialization thread based on
4961 * current settings
4962 */
4963 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4964 ext4_unregister_li_request(sb);
4965 else {
4966 ext4_group_t first_not_zeroed;
4967 first_not_zeroed = ext4_has_uninit_itable(sb);
4968 ext4_register_li_request(sb, first_not_zeroed);
4969 }
4970
6fd058f7 4971 ext4_setup_system_zone(sb);
d096ad0f 4972 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4973 ext4_commit_super(sb, 1);
0390131b 4974
ac27a0ec
DK		 4975#ifdef CONFIG_QUOTA
4976 /* Release old quota file names */
a2d4a646 4977 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4978 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4979 if (enable_quota) {
4980 if (sb_any_quota_suspended(sb))
4981 dquot_resume(sb, -1);
e2b911c5 4982 else if (ext4_has_feature_quota(sb)) {
7c319d32 4983 err = ext4_enable_quotas(sb);
07724f98 4984 if (err)
7c319d32 4985 goto restore_opts;
7c319d32
AK		 4986 }
4987 }
ac27a0ec 4988#endif
d4c402d9 4989
a26f4992 4990 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4991 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4992 kfree(orig_data);
ac27a0ec 4993 return 0;
0b8e58a1 4994
ac27a0ec
DK		 4995restore_opts:
4996 sb->s_flags = old_sb_flags;
4997 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4998 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4999 sbi->s_resuid = old_opts.s_resuid;
5000 sbi->s_resgid = old_opts.s_resgid;
5001 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5002 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5003 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5004#ifdef CONFIG_QUOTA
5005 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5006 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5007 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5008 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5009 }
5010#endif
d4c402d9 5011 kfree(orig_data);
ac27a0ec
DK		 5012 return err;
5013}
5014
689c958c
LX		 5015#ifdef CONFIG_QUOTA
5016static int ext4_statfs_project(struct super_block *sb,
5017 kprojid_t projid, struct kstatfs *buf)
5018{
5019 struct kqid qid;
5020 struct dquot *dquot;
5021 u64 limit;
5022 u64 curblock;
5023
5024 qid = make_kqid_projid(projid);
5025 dquot = dqget(sb, qid);
5026 if (IS_ERR(dquot))
5027 return PTR_ERR(dquot);
5028 spin_lock(&dq_data_lock);
5029
5030 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5031 dquot->dq_dqb.dqb_bsoftlimit :
5032 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5033 if (limit && buf->f_blocks > limit) {
5034 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5035 buf->f_blocks = limit;
5036 buf->f_bfree = buf->f_bavail =
5037 (buf->f_blocks > curblock) ?
5038 (buf->f_blocks - curblock) : 0;
5039 }
5040
5041 limit = dquot->dq_dqb.dqb_isoftlimit ?
5042 dquot->dq_dqb.dqb_isoftlimit :
5043 dquot->dq_dqb.dqb_ihardlimit;
5044 if (limit && buf->f_files > limit) {
5045 buf->f_files = limit;
5046 buf->f_ffree =
5047 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5048 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5049 }
5050
5051 spin_unlock(&dq_data_lock);
5052 dqput(dquot);
5053 return 0;
5054}
5055#endif
5056
2b2d6d01 5057static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5058{
5059 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5060 struct ext4_sb_info *sbi = EXT4_SB(sb);
5061 struct ext4_super_block *es = sbi->s_es;
27dd4385 5062 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5063 u64 fsid;
d02a9391 5064 s64 bfree;
27dd4385 5065 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5066
952fc18e
TT		 5067 if (!test_opt(sb, MINIX_DF))
5068 overhead = sbi->s_overhead;
ac27a0ec 5069
617ba13b 5070 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5071 buf->f_bsize = sb->s_blocksize;
b72f78cb 5072 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5073 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5074 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5075 /* prevent underflow in case that few free space is available */
57042651 5076 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5077 buf->f_bavail = buf->f_bfree -
5078 (ext4_r_blocks_count(es) + resv_blocks);
5079 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5080 buf->f_bavail = 0;
5081 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5082 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5083 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5084 fsid = le64_to_cpup((void *)es->s_uuid) ^
5085 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5086 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5087 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5088
689c958c
LX		 5089#ifdef CONFIG_QUOTA
5090 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5091 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5092 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5093#endif
ac27a0ec
DK		 5094 return 0;
5095}
5096
0b8e58a1
AD		 5097/* Helper function for writing quotas on sync - we need to start transaction
5098 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5099 * Process 1 Process 2
617ba13b 5100 * ext4_create() quota_sync()
a269eb18 5101 * jbd2_journal_start() write_dquot()
871a2931 5102 * dquot_initialize() down(dqio_mutex)
dab291af 5103 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5104 *
5105 */
5106
5107#ifdef CONFIG_QUOTA
5108
5109static inline struct inode *dquot_to_inode(struct dquot *dquot)
5110{
4c376dca 5111 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5112}
5113
617ba13b 5114static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5115{
5116 int ret, err;
5117 handle_t *handle;
5118 struct inode *inode;
5119
5120 inode = dquot_to_inode(dquot);
9924a92a 5121 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5122 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5123 if (IS_ERR(handle))
5124 return PTR_ERR(handle);
5125 ret = dquot_commit(dquot);
617ba13b 5126 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5127 if (!ret)
5128 ret = err;
5129 return ret;
5130}
5131
617ba13b 5132static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5133{
5134 int ret, err;
5135 handle_t *handle;
5136
9924a92a 5137 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5138 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5139 if (IS_ERR(handle))
5140 return PTR_ERR(handle);
5141 ret = dquot_acquire(dquot);
617ba13b 5142 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5143 if (!ret)
5144 ret = err;
5145 return ret;
5146}
5147
617ba13b 5148static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5149{
5150 int ret, err;
5151 handle_t *handle;
5152
9924a92a 5153 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5154 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5155 if (IS_ERR(handle)) {
5156 /* Release dquot anyway to avoid endless cycle in dqput() */
5157 dquot_release(dquot);
ac27a0ec 5158 return PTR_ERR(handle);
9c3013e9 5159 }
ac27a0ec 5160 ret = dquot_release(dquot);
617ba13b 5161 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5162 if (!ret)
5163 ret = err;
5164 return ret;
5165}
5166
617ba13b 5167static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5168{
262b4662
JK		 5169 struct super_block *sb = dquot->dq_sb;
5170 struct ext4_sb_info *sbi = EXT4_SB(sb);
5171
2c8be6b2 5172 /* Are we journaling quotas? */
e2b911c5 5173 if (ext4_has_feature_quota(sb) ||
262b4662 5174 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5175 dquot_mark_dquot_dirty(dquot);
617ba13b 5176 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5177 } else {
5178 return dquot_mark_dquot_dirty(dquot);
5179 }
5180}
5181
617ba13b 5182static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5183{
5184 int ret, err;
5185 handle_t *handle;
5186
5187 /* Data block + inode block */
2b0143b5 5188 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5189 if (IS_ERR(handle))
5190 return PTR_ERR(handle);
5191 ret = dquot_commit_info(sb, type);
617ba13b 5192 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5193 if (!ret)
5194 ret = err;
5195 return ret;
5196}
5197
5198/*
5199 * Turn on quotas during mount time - we need to find
5200 * the quota file and such...
5201 */
617ba13b 5202static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5203{
287a8095
CH		 5204 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5205 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5206}
5207
daf647d2
TT		 5208static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5209{
5210 struct ext4_inode_info *ei = EXT4_I(inode);
5211
5212 /* The first argument of lockdep_set_subclass has to be
5213 * *exactly* the same as the argument to init_rwsem() --- in
5214 * this case, in init_once() --- or lockdep gets unhappy
5215 * because the name of the lock is set using the
5216 * stringification of the argument to init_rwsem().
5217 */
5218 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5219 lockdep_set_subclass(&ei->i_data_sem, subclass);
5220}
5221
ac27a0ec
DK		 5222/*
5223 * Standard function to be called on quota_on
5224 */
617ba13b 5225static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5226 struct path *path)
ac27a0ec
DK		 5227{
5228 int err;
ac27a0ec
DK		 5229
5230 if (!test_opt(sb, QUOTA))
5231 return -EINVAL;
0623543b 5232
ac27a0ec 5233 /* Quotafile not on the same filesystem? */
d8c9584e 5234 if (path->dentry->d_sb != sb)
ac27a0ec 5235 return -EXDEV;
0623543b
JK		 5236 /* Journaling quota? */
5237 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5238 /* Quotafile not in fs root? */
f00c9e44 5239 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5240 ext4_msg(sb, KERN_WARNING,
5241 "Quota file not on filesystem root. "
5242 "Journaled quota will not work");
2b2d6d01 5243 }
0623543b
JK		 5244
5245 /*
5246 * When we journal data on quota file, we have to flush journal to see
5247 * all updates to the file when we bypass pagecache...
5248 */
0390131b 5249 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5250 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5251 /*
5252 * We don't need to lock updates but journal_flush() could
5253 * otherwise be livelocked...
5254 */
5255 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5256 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5257 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5258 if (err)
7ffe1ea8 5259 return err;
0623543b 5260 }
daf647d2
TT		 5261 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5262 err = dquot_quota_on(sb, type, format_id, path);
5263 if (err)
5264 lockdep_set_quota_inode(path->dentry->d_inode,
5265 I_DATA_SEM_NORMAL);
5266 return err;
ac27a0ec
DK		 5267}
5268
7c319d32
AK		 5269static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5270 unsigned int flags)
5271{
5272 int err;
5273 struct inode *qf_inode;
a2d4a646 5274 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5275 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5276 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5277 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5278 };
5279
e2b911c5 5280 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5281
5282 if (!qf_inums[type])
5283 return -EPERM;
5284
5285 qf_inode = ext4_iget(sb, qf_inums[type]);
5286 if (IS_ERR(qf_inode)) {
5287 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5288 return PTR_ERR(qf_inode);
5289 }
5290
bcb13850
JK		 5291 /* Don't account quota for quota files to avoid recursion */
5292 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5293 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5294 err = dquot_enable(qf_inode, type, format_id, flags);
5295 iput(qf_inode);
daf647d2
TT		 5296 if (err)
5297 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5298
5299 return err;
5300}
5301
5302/* Enable usage tracking for all quota types. */
5303static int ext4_enable_quotas(struct super_block *sb)
5304{
5305 int type, err = 0;
a2d4a646 5306 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5307 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5308 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5309 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5310 };
49da9392
JK		 5311 bool quota_mopt[EXT4_MAXQUOTAS] = {
5312 test_opt(sb, USRQUOTA),
5313 test_opt(sb, GRPQUOTA),
5314 test_opt(sb, PRJQUOTA),
5315 };
7c319d32
AK		 5316
5317 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5318 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5319 if (qf_inums[type]) {
5320 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5321 DQUOT_USAGE_ENABLED |
5322 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5323 if (err) {
5324 ext4_warning(sb,
72ba7450
TT		 5325 "Failed to enable quota tracking "
5326 "(type=%d, err=%d). Please run "
5327 "e2fsck to fix.", type, err);
7c319d32
AK		 5328 return err;
5329 }
5330 }
5331 }
5332 return 0;
5333}
5334
ca0e05e4
DM		 5335static int ext4_quota_off(struct super_block *sb, int type)
5336{
21f97697
JK		 5337 struct inode *inode = sb_dqopt(sb)->files[type];
5338 handle_t *handle;
5339
87009d86
DM		 5340 /* Force all delayed allocation blocks to be allocated.
5341 * Caller already holds s_umount sem */
5342 if (test_opt(sb, DELALLOC))
ca0e05e4 5343 sync_filesystem(sb);
ca0e05e4 5344
0b268590
AG		 5345 if (!inode)
5346 goto out;
5347
21f97697
JK		 5348 /* Update modification times of quota files when userspace can
5349 * start looking at them */
9924a92a 5350 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5351 if (IS_ERR(handle))
5352 goto out;
5353 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5354 ext4_mark_inode_dirty(handle, inode);
5355 ext4_journal_stop(handle);
5356
5357out:
ca0e05e4
DM		 5358 return dquot_quota_off(sb, type);
5359}
5360
ac27a0ec
DK		 5361/* Read data from quotafile - avoid pagecache and such because we cannot afford
5362 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5363 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5364 * we don't have to be afraid of races */
617ba13b 5365static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5366 size_t len, loff_t off)
5367{
5368 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5369 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5370 int offset = off & (sb->s_blocksize - 1);
5371 int tocopy;
5372 size_t toread;
5373 struct buffer_head *bh;
5374 loff_t i_size = i_size_read(inode);
5375
5376 if (off > i_size)
5377 return 0;
5378 if (off+len > i_size)
5379 len = i_size-off;
5380 toread = len;
5381 while (toread > 0) {
5382 tocopy = sb->s_blocksize - offset < toread ?
5383 sb->s_blocksize - offset : toread;
1c215028
TT		 5384 bh = ext4_bread(NULL, inode, blk, 0);
5385 if (IS_ERR(bh))
5386 return PTR_ERR(bh);
ac27a0ec
DK		 5387 if (!bh) /* A hole? */
5388 memset(data, 0, tocopy);
5389 else
5390 memcpy(data, bh->b_data+offset, tocopy);
5391 brelse(bh);
5392 offset = 0;
5393 toread -= tocopy;
5394 data += tocopy;
5395 blk++;
5396 }
5397 return len;
5398}
5399
5400/* Write to quotafile (we know the transaction is already started and has
5401 * enough credits) */
617ba13b 5402static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5403 const char *data, size_t len, loff_t off)
5404{
5405 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5406 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5407 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5408 int retries = 0;
ac27a0ec
DK		 5409 struct buffer_head *bh;
5410 handle_t *handle = journal_current_handle();
5411
0390131b 5412 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5413 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5414 " cancelled because transaction is not started",
9c3013e9
JK		 5415 (unsigned long long)off, (unsigned long long)len);
5416 return -EIO;
5417 }
67eeb568
DM		 5418 /*
5419 * Since we account only one data block in transaction credits,
5420 * then it is impossible to cross a block boundary.
5421 */
5422 if (sb->s_blocksize - offset < len) {
5423 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5424 " cancelled because not block aligned",
5425 (unsigned long long)off, (unsigned long long)len);
5426 return -EIO;
5427 }
5428
c5e298ae
TT		 5429 do {
5430 bh = ext4_bread(handle, inode, blk,
5431 EXT4_GET_BLOCKS_CREATE |
5432 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5433 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5434 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5435 if (IS_ERR(bh))
5436 return PTR_ERR(bh);
67eeb568
DM		 5437 if (!bh)
5438 goto out;
5d601255 5439 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5440 err = ext4_journal_get_write_access(handle, bh);
5441 if (err) {
5442 brelse(bh);
1c215028 5443 return err;
ac27a0ec 5444 }
67eeb568
DM		 5445 lock_buffer(bh);
5446 memcpy(bh->b_data+offset, data, len);
5447 flush_dcache_page(bh->b_page);
5448 unlock_buffer(bh);
62d2b5f2 5449 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5450 brelse(bh);
ac27a0ec 5451out:
67eeb568
DM		 5452 if (inode->i_size < off + len) {
5453 i_size_write(inode, off + len);
617ba13b 5454 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5455 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5456 }
67eeb568 5457 return len;
ac27a0ec
DK		 5458}
5459
8f0e8746
TT		 5460static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5461{
5462 const struct quota_format_ops *ops;
5463
5464 if (!sb_has_quota_loaded(sb, qid->type))
5465 return -ESRCH;
5466 ops = sb_dqopt(sb)->ops[qid->type];
5467 if (!ops || !ops->get_next_id)
5468 return -ENOSYS;
5469 return dquot_get_next_id(sb, qid);
5470}
ac27a0ec
DK		 5471#endif
5472
152a0836
AV		 5473static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5474 const char *dev_name, void *data)
ac27a0ec 5475{
152a0836 5476 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5477}
5478
c290ea01 5479#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5480static inline void register_as_ext2(void)
5481{
5482 int err = register_filesystem(&ext2_fs_type);
5483 if (err)
5484 printk(KERN_WARNING
5485 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5486}
5487
5488static inline void unregister_as_ext2(void)
5489{
5490 unregister_filesystem(&ext2_fs_type);
5491}
2035e776
TT		 5492
5493static inline int ext2_feature_set_ok(struct super_block *sb)
5494{
e2b911c5 5495 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5496 return 0;
5497 if (sb->s_flags & MS_RDONLY)
5498 return 1;
e2b911c5 5499 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5500 return 0;
5501 return 1;
5502}
24b58424
TT		 5503#else
5504static inline void register_as_ext2(void) { }
5505static inline void unregister_as_ext2(void) { }
2035e776 5506static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5507#endif
5508
24b58424
TT		 5509static inline void register_as_ext3(void)
5510{
5511 int err = register_filesystem(&ext3_fs_type);
5512 if (err)
5513 printk(KERN_WARNING
5514 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5515}
5516
5517static inline void unregister_as_ext3(void)
5518{
5519 unregister_filesystem(&ext3_fs_type);
5520}
2035e776
TT		 5521
5522static inline int ext3_feature_set_ok(struct super_block *sb)
5523{
e2b911c5 5524 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5525 return 0;
e2b911c5 5526 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5527 return 0;
5528 if (sb->s_flags & MS_RDONLY)
5529 return 1;
e2b911c5 5530 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5531 return 0;
5532 return 1;
5533}
24b58424 5534
03010a33
TT		 5535static struct file_system_type ext4_fs_type = {
5536 .owner = THIS_MODULE,
5537 .name = "ext4",
152a0836 5538 .mount = ext4_mount,
03010a33
TT		 5539 .kill_sb = kill_block_super,
5540 .fs_flags = FS_REQUIRES_DEV,
5541};
7f78e035 5542MODULE_ALIAS_FS("ext4");
03010a33 5543
e9e3bcec
ES		 5544/* Shared across all ext4 file systems */
5545wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5546
5dabfc78 5547static int __init ext4_init_fs(void)
ac27a0ec 5548{
e9e3bcec 5549 int i, err;
c9de560d 5550
e294a537 5551 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5552 ext4_li_info = NULL;
5553 mutex_init(&ext4_li_mtx);
5554
9a4c8019 5555 /* Build-time check for flags consistency */
12e9b892 5556 ext4_check_flag_values();
e9e3bcec 5557
e142d052 5558 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5559 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5560
51865fda 5561 err = ext4_init_es();
6fd058f7
TT		 5562 if (err)
5563 return err;
51865fda
ZL		 5564
5565 err = ext4_init_pageio();
5566 if (err)
b5799018 5567 goto out5;
51865fda 5568
5dabfc78 5569 err = ext4_init_system_zone();
bd2d0210 5570 if (err)
b5799018 5571 goto out4;
857ac889 5572
b5799018 5573 err = ext4_init_sysfs();
dd68314c 5574 if (err)
b5799018 5575 goto out3;
857ac889 5576
5dabfc78 5577 err = ext4_init_mballoc();
c9de560d
AT		 5578 if (err)
5579 goto out2;
ac27a0ec
DK		 5580 err = init_inodecache();
5581 if (err)
5582 goto out1;
24b58424 5583 register_as_ext3();
2035e776 5584 register_as_ext2();
03010a33 5585 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5586 if (err)
5587 goto out;
bfff6873 5588
ac27a0ec
DK		 5589 return 0;
5590out:
24b58424
TT		 5591 unregister_as_ext2();
5592 unregister_as_ext3();
ac27a0ec
DK		 5593 destroy_inodecache();
5594out1:
5dabfc78 5595 ext4_exit_mballoc();
9c191f70 5596out2:
b5799018
TT		 5597 ext4_exit_sysfs();
5598out3:
5dabfc78 5599 ext4_exit_system_zone();
b5799018 5600out4:
5dabfc78 5601 ext4_exit_pageio();
b5799018 5602out5:
51865fda
ZL		 5603 ext4_exit_es();
5604
ac27a0ec
DK		 5605 return err;
5606}
5607
5dabfc78 5608static void __exit ext4_exit_fs(void)
ac27a0ec 5609{
bfff6873 5610 ext4_destroy_lazyinit_thread();
24b58424
TT		 5611 unregister_as_ext2();
5612 unregister_as_ext3();
03010a33 5613 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5614 destroy_inodecache();
5dabfc78 5615 ext4_exit_mballoc();
b5799018 5616 ext4_exit_sysfs();
5dabfc78
TT		 5617 ext4_exit_system_zone();
5618 ext4_exit_pageio();
dd12ed14 5619 ext4_exit_es();
ac27a0ec
DK		 5620}
5621
5622MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5623MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5624MODULE_LICENSE("GPL");
5dabfc78
TT		 5625module_init(ext4_init_fs)
5626module_exit(ext4_exit_fs)