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Merge tag 'v3.10.107' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
4a092d73 48#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 72static int ext4_remount(struct super_block *sb, int *flags, char *data);
73static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 74static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 75static int ext4_freeze(struct super_block *sb);
152a0836
AV		 76static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
2035e776
TT		 78static inline int ext2_feature_set_ok(struct super_block *sb);
79static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 80static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 81static void ext4_destroy_lazyinit_thread(void);
82static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 83static void ext4_clear_request_list(void);
27dd4385 84static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 85
2035e776
TT		 86#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93};
7f78e035 94MODULE_ALIAS_FS("ext2");
fa7614dd 95MODULE_ALIAS("ext2");
2035e776
TT		 96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
7f78e035 110MODULE_ALIAS_FS("ext3");
fa7614dd 111MODULE_ALIAS("ext3");
ba69f9ab
JK		 112#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
113#else
114#define IS_EXT3_SB(sb) (0)
115#endif
bd81d8ee 116
d25425f8
DW		 117static int ext4_verify_csum_type(struct super_block *sb,
118 struct ext4_super_block *es)
119{
120 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
121 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
122 return 1;
123
124 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
125}
126
a9c47317
DW		 127static __le32 ext4_superblock_csum(struct super_block *sb,
128 struct ext4_super_block *es)
129{
130 struct ext4_sb_info *sbi = EXT4_SB(sb);
131 int offset = offsetof(struct ext4_super_block, s_checksum);
132 __u32 csum;
133
134 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
135
136 return cpu_to_le32(csum);
137}
138
139int ext4_superblock_csum_verify(struct super_block *sb,
140 struct ext4_super_block *es)
141{
142 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
143 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
144 return 1;
145
146 return es->s_checksum == ext4_superblock_csum(sb, es);
147}
148
06db49e6 149void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 150{
06db49e6
TT		 151 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
152
a9c47317
DW		 153 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
154 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
155 return;
156
157 es->s_checksum = ext4_superblock_csum(sb, es);
158}
159
9933fc0a
TT		 160void *ext4_kvmalloc(size_t size, gfp_t flags)
161{
162 void *ret;
163
164 ret = kmalloc(size, flags);
165 if (!ret)
166 ret = __vmalloc(size, flags, PAGE_KERNEL);
167 return ret;
168}
169
170void *ext4_kvzalloc(size_t size, gfp_t flags)
171{
172 void *ret;
173
db9481c0 174 ret = kzalloc(size, flags);
9933fc0a
TT		 175 if (!ret)
176 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
177 return ret;
178}
179
180void ext4_kvfree(void *ptr)
181{
182 if (is_vmalloc_addr(ptr))
183 vfree(ptr);
184 else
185 kfree(ptr);
186
187}
188
8fadc143
AR		 189ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
190 struct ext4_group_desc *bg)
bd81d8ee 191{
3a14589c 192 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 193 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 194 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 195}
196
8fadc143
AR		 197ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
198 struct ext4_group_desc *bg)
bd81d8ee 199{
5272f837 200 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 201 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 202 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 203}
204
8fadc143
AR		 205ext4_fsblk_t ext4_inode_table(struct super_block *sb,
206 struct ext4_group_desc *bg)
bd81d8ee 207{
5272f837 208 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 209 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 210 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 211}
212
021b65bb
TT		 213__u32 ext4_free_group_clusters(struct super_block *sb,
214 struct ext4_group_desc *bg)
560671a0
AK		 215{
216 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
217 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 218 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 219}
220
221__u32 ext4_free_inodes_count(struct super_block *sb,
222 struct ext4_group_desc *bg)
223{
224 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
225 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 226 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 227}
228
229__u32 ext4_used_dirs_count(struct super_block *sb,
230 struct ext4_group_desc *bg)
231{
232 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
233 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 234 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 235}
236
237__u32 ext4_itable_unused_count(struct super_block *sb,
238 struct ext4_group_desc *bg)
239{
240 return le16_to_cpu(bg->bg_itable_unused_lo) |
241 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 242 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 243}
244
8fadc143
AR		 245void ext4_block_bitmap_set(struct super_block *sb,
246 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 247{
3a14589c 248 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 249 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
250 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 251}
252
8fadc143
AR		 253void ext4_inode_bitmap_set(struct super_block *sb,
254 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 255{
5272f837 256 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 257 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
258 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 259}
260
8fadc143
AR		 261void ext4_inode_table_set(struct super_block *sb,
262 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 263{
5272f837 264 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 265 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
266 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 267}
268
021b65bb
TT		 269void ext4_free_group_clusters_set(struct super_block *sb,
270 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 271{
272 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
273 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
274 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
275}
276
277void ext4_free_inodes_set(struct super_block *sb,
278 struct ext4_group_desc *bg, __u32 count)
279{
280 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
281 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
282 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
283}
284
285void ext4_used_dirs_set(struct super_block *sb,
286 struct ext4_group_desc *bg, __u32 count)
287{
288 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
289 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
290 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
291}
292
293void ext4_itable_unused_set(struct super_block *sb,
294 struct ext4_group_desc *bg, __u32 count)
295{
296 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
297 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
298 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
299}
300
d3d1faf6 301
1c13d5c0
TT		 302static void __save_error_info(struct super_block *sb, const char *func,
303 unsigned int line)
304{
305 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
306
307 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
308 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
309 es->s_last_error_time = cpu_to_le32(get_seconds());
310 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
311 es->s_last_error_line = cpu_to_le32(line);
312 if (!es->s_first_error_time) {
313 es->s_first_error_time = es->s_last_error_time;
314 strncpy(es->s_first_error_func, func,
315 sizeof(es->s_first_error_func));
316 es->s_first_error_line = cpu_to_le32(line);
317 es->s_first_error_ino = es->s_last_error_ino;
318 es->s_first_error_block = es->s_last_error_block;
319 }
66e61a9e
TT		 320 /*
321 * Start the daily error reporting function if it hasn't been
322 * started already
323 */
324 if (!es->s_error_count)
325 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 326 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 327}
328
329static void save_error_info(struct super_block *sb, const char *func,
330 unsigned int line)
331{
332 __save_error_info(sb, func, line);
333 ext4_commit_super(sb, 1);
334}
335
7c2e7087
TT		 336/*
337 * The del_gendisk() function uninitializes the disk-specific data
338 * structures, including the bdi structure, without telling anyone
339 * else. Once this happens, any attempt to call mark_buffer_dirty()
340 * (for example, by ext4_commit_super), will cause a kernel OOPS.
341 * This is a kludge to prevent these oops until we can put in a proper
342 * hook in del_gendisk() to inform the VFS and file system layers.
343 */
344static int block_device_ejected(struct super_block *sb)
345{
346 struct inode *bd_inode = sb->s_bdev->bd_inode;
347 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
348
349 return bdi->dev == NULL;
350}
351
18aadd47
BJ		 352static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
353{
354 struct super_block *sb = journal->j_private;
355 struct ext4_sb_info *sbi = EXT4_SB(sb);
356 int error = is_journal_aborted(journal);
5d3ee208 357 struct ext4_journal_cb_entry *jce;
18aadd47 358
5d3ee208 359 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 360 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 361 while (!list_empty(&txn->t_private_list)) {
362 jce = list_entry(txn->t_private_list.next,
363 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 364 list_del_init(&jce->jce_list);
365 spin_unlock(&sbi->s_md_lock);
366 jce->jce_func(sb, jce, error);
367 spin_lock(&sbi->s_md_lock);
368 }
369 spin_unlock(&sbi->s_md_lock);
370}
1c13d5c0 371
ac27a0ec
DK		 372/* Deal with the reporting of failure conditions on a filesystem such as
373 * inconsistencies detected or read IO failures.
374 *
375 * On ext2, we can store the error state of the filesystem in the
617ba13b 376 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 377 * write ordering constraints on the superblock which prevent us from
378 * writing it out straight away; and given that the journal is about to
379 * be aborted, we can't rely on the current, or future, transactions to
380 * write out the superblock safely.
381 *
dab291af 382 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 383 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 384 * that error until we've noted it down and cleared it.
385 */
386
617ba13b 387static void ext4_handle_error(struct super_block *sb)
ac27a0ec 388{
ac27a0ec
DK		 389 if (sb->s_flags & MS_RDONLY)
390 return;
391
2b2d6d01 392 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 393 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 394
4ab2f15b 395 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 396 if (journal)
dab291af 397 jbd2_journal_abort(journal, -EIO);
ac27a0ec 398 }
2b2d6d01 399 if (test_opt(sb, ERRORS_RO)) {
b31e1552 400 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 401 sb->s_flags |= MS_RDONLY;
402 }
fe4b6c26
DJ		 403 if (test_opt(sb, ERRORS_PANIC)) {
404 if (EXT4_SB(sb)->s_journal &&
405 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
406 return;
617ba13b 407 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 408 sb->s_id);
fe4b6c26 409 }
ac27a0ec
DK		 410}
411
12062ddd 412void __ext4_error(struct super_block *sb, const char *function,
c398eda0 413 unsigned int line, const char *fmt, ...)
ac27a0ec 414{
0ff2ea7d 415 struct va_format vaf;
ac27a0ec
DK		 416 va_list args;
417
418 va_start(args, fmt);
0ff2ea7d
JP		 419 vaf.fmt = fmt;
420 vaf.va = &args;
421 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
422 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 423 va_end(args);
f3fc0210 424 save_error_info(sb, function, line);
ac27a0ec 425
617ba13b 426 ext4_handle_error(sb);
ac27a0ec
DK		 427}
428
c398eda0
TT		 429void ext4_error_inode(struct inode *inode, const char *function,
430 unsigned int line, ext4_fsblk_t block,
273df556
FM		 431 const char *fmt, ...)
432{
433 va_list args;
f7c21177 434 struct va_format vaf;
1c13d5c0 435 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 436
1c13d5c0
TT		 437 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
438 es->s_last_error_block = cpu_to_le64(block);
439 save_error_info(inode->i_sb, function, line);
273df556 440 va_start(args, fmt);
f7c21177
TT		 441 vaf.fmt = fmt;
442 vaf.va = &args;
c398eda0 443 if (block)
d9ee81da
JP		 444 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
445 "inode #%lu: block %llu: comm %s: %pV\n",
446 inode->i_sb->s_id, function, line, inode->i_ino,
447 block, current->comm, &vaf);
448 else
449 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
450 "inode #%lu: comm %s: %pV\n",
451 inode->i_sb->s_id, function, line, inode->i_ino,
452 current->comm, &vaf);
273df556
FM		 453 va_end(args);
454
455 ext4_handle_error(inode->i_sb);
456}
457
c398eda0 458void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 459 unsigned int line, ext4_fsblk_t block,
460 const char *fmt, ...)
273df556
FM		 461{
462 va_list args;
f7c21177 463 struct va_format vaf;
1c13d5c0 464 struct ext4_super_block *es;
496ad9aa 465 struct inode *inode = file_inode(file);
273df556
FM		 466 char pathname[80], *path;
467
1c13d5c0
TT		 468 es = EXT4_SB(inode->i_sb)->s_es;
469 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
470 save_error_info(inode->i_sb, function, line);
273df556 471 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 472 if (IS_ERR(path))
273df556 473 path = "(unknown)";
f7c21177
TT		 474 va_start(args, fmt);
475 vaf.fmt = fmt;
476 vaf.va = &args;
d9ee81da
JP		 477 if (block)
478 printk(KERN_CRIT
479 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
480 "block %llu: comm %s: path %s: %pV\n",
481 inode->i_sb->s_id, function, line, inode->i_ino,
482 block, current->comm, path, &vaf);
483 else
484 printk(KERN_CRIT
485 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
486 "comm %s: path %s: %pV\n",
487 inode->i_sb->s_id, function, line, inode->i_ino,
488 current->comm, path, &vaf);
273df556
FM		 489 va_end(args);
490
491 ext4_handle_error(inode->i_sb);
492}
493
722887dd
TT		 494const char *ext4_decode_error(struct super_block *sb, int errno,
495 char nbuf[16])
ac27a0ec
DK		 496{
497 char *errstr = NULL;
498
499 switch (errno) {
500 case -EIO:
501 errstr = "IO failure";
502 break;
503 case -ENOMEM:
504 errstr = "Out of memory";
505 break;
506 case -EROFS:
78f1ddbb
TT		 507 if (!sb || (EXT4_SB(sb)->s_journal &&
508 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 509 errstr = "Journal has aborted";
510 else
511 errstr = "Readonly filesystem";
512 break;
513 default:
514 /* If the caller passed in an extra buffer for unknown
515 * errors, textualise them now. Else we just return
516 * NULL. */
517 if (nbuf) {
518 /* Check for truncated error codes... */
519 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
520 errstr = nbuf;
521 }
522 break;
523 }
524
525 return errstr;
526}
527
617ba13b 528/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 529 * automatically and invokes the appropriate error response. */
530
c398eda0
TT		 531void __ext4_std_error(struct super_block *sb, const char *function,
532 unsigned int line, int errno)
ac27a0ec
DK		 533{
534 char nbuf[16];
535 const char *errstr;
536
537 /* Special case: if the error is EROFS, and we're not already
538 * inside a transaction, then there's really no point in logging
539 * an error. */
540 if (errno == -EROFS && journal_current_handle() == NULL &&
541 (sb->s_flags & MS_RDONLY))
542 return;
543
617ba13b 544 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 545 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
546 sb->s_id, function, line, errstr);
1c13d5c0 547 save_error_info(sb, function, line);
ac27a0ec 548
617ba13b 549 ext4_handle_error(sb);
ac27a0ec
DK		 550}
551
552/*
617ba13b 553 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 554 * abort function may be used to deal with unrecoverable failures such
555 * as journal IO errors or ENOMEM at a critical moment in log management.
556 *
557 * We unconditionally force the filesystem into an ABORT|READONLY state,
558 * unless the error response on the fs has been set to panic in which
559 * case we take the easy way out and panic immediately.
560 */
561
c67d859e 562void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 563 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 564{
565 va_list args;
566
1c13d5c0 567 save_error_info(sb, function, line);
ac27a0ec 568 va_start(args, fmt);
c398eda0
TT		 569 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
570 function, line);
ac27a0ec
DK		 571 vprintk(fmt, args);
572 printk("\n");
573 va_end(args);
574
1c13d5c0
TT		 575 if ((sb->s_flags & MS_RDONLY) == 0) {
576 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
577 sb->s_flags |= MS_RDONLY;
578 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
579 if (EXT4_SB(sb)->s_journal)
580 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
581 save_error_info(sb, function, line);
582 }
fe4b6c26
DJ		 583 if (test_opt(sb, ERRORS_PANIC)) {
584 if (EXT4_SB(sb)->s_journal &&
585 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
586 return;
617ba13b 587 panic("EXT4-fs panic from previous error\n");
fe4b6c26 588 }
ac27a0ec
DK		 589}
590
0ff2ea7d 591void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 592{
0ff2ea7d 593 struct va_format vaf;
b31e1552
ES		 594 va_list args;
595
596 va_start(args, fmt);
0ff2ea7d
JP		 597 vaf.fmt = fmt;
598 vaf.va = &args;
599 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 600 va_end(args);
601}
602
12062ddd 603void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 604 unsigned int line, const char *fmt, ...)
ac27a0ec 605{
0ff2ea7d 606 struct va_format vaf;
ac27a0ec
DK		 607 va_list args;
608
609 va_start(args, fmt);
0ff2ea7d
JP		 610 vaf.fmt = fmt;
611 vaf.va = &args;
612 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
613 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 614 va_end(args);
615}
616
e29136f8
TT		 617void __ext4_grp_locked_error(const char *function, unsigned int line,
618 struct super_block *sb, ext4_group_t grp,
619 unsigned long ino, ext4_fsblk_t block,
620 const char *fmt, ...)
5d1b1b3f
AK		 621__releases(bitlock)
622__acquires(bitlock)
623{
0ff2ea7d 624 struct va_format vaf;
5d1b1b3f
AK		 625 va_list args;
626 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
627
1c13d5c0
TT		 628 es->s_last_error_ino = cpu_to_le32(ino);
629 es->s_last_error_block = cpu_to_le64(block);
630 __save_error_info(sb, function, line);
0ff2ea7d 631
5d1b1b3f 632 va_start(args, fmt);
0ff2ea7d
JP		 633
634 vaf.fmt = fmt;
635 vaf.va = &args;
21149d61 636 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 637 sb->s_id, function, line, grp);
638 if (ino)
0ff2ea7d 639 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 640 if (block)
0ff2ea7d
JP		 641 printk(KERN_CONT "block %llu:", (unsigned long long) block);
642 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 643 va_end(args);
644
645 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 646 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 647 return;
648 }
1c13d5c0 649
5d1b1b3f
AK		 650 ext4_unlock_group(sb, grp);
651 ext4_handle_error(sb);
652 /*
653 * We only get here in the ERRORS_RO case; relocking the group
654 * may be dangerous, but nothing bad will happen since the
655 * filesystem will have already been marked read/only and the
656 * journal has been aborted. We return 1 as a hint to callers
657 * who might what to use the return value from
25985edc 658 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 659 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
660 * aggressively from the ext4 function in question, with a
661 * more appropriate error code.
662 */
663 ext4_lock_group(sb, grp);
664 return;
665}
666
617ba13b 667void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 668{
617ba13b 669 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 670
617ba13b 671 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 672 return;
673
12062ddd 674 ext4_warning(sb,
ac27a0ec
DK		 675 "updating to rev %d because of new feature flag, "
676 "running e2fsck is recommended",
617ba13b 677 EXT4_DYNAMIC_REV);
ac27a0ec 678
617ba13b
MC		 679 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
680 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
681 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 682 /* leave es->s_feature_*compat flags alone */
683 /* es->s_uuid will be set by e2fsck if empty */
684
685 /*
686 * The rest of the superblock fields should be zero, and if not it
687 * means they are likely already in use, so leave them alone. We
688 * can leave it up to e2fsck to clean up any inconsistencies there.
689 */
690}
691
692/*
693 * Open the external journal device
694 */
b31e1552 695static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 696{
697 struct block_device *bdev;
698 char b[BDEVNAME_SIZE];
699
d4d77629 700 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 701 if (IS_ERR(bdev))
702 goto fail;
703 return bdev;
704
705fail:
b31e1552 706 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 707 __bdevname(dev, b), PTR_ERR(bdev));
708 return NULL;
709}
710
711/*
712 * Release the journal device
713 */
4385bab1 714static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 715{
4385bab1 716 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 717}
718
4385bab1 719static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 720{
721 struct block_device *bdev;
ac27a0ec
DK		 722 bdev = sbi->journal_bdev;
723 if (bdev) {
4385bab1 724 ext4_blkdev_put(bdev);
ac27a0ec
DK		 725 sbi->journal_bdev = NULL;
726 }
ac27a0ec
DK		 727}
728
729static inline struct inode *orphan_list_entry(struct list_head *l)
730{
617ba13b 731 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 732}
733
617ba13b 734static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 735{
736 struct list_head *l;
737
b31e1552
ES		 738 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
739 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 740
741 printk(KERN_ERR "sb_info orphan list:\n");
742 list_for_each(l, &sbi->s_orphan) {
743 struct inode *inode = orphan_list_entry(l);
744 printk(KERN_ERR " "
745 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
746 inode->i_sb->s_id, inode->i_ino, inode,
747 inode->i_mode, inode->i_nlink,
748 NEXT_ORPHAN(inode));
749 }
750}
751
2b2d6d01 752static void ext4_put_super(struct super_block *sb)
ac27a0ec 753{
617ba13b
MC		 754 struct ext4_sb_info *sbi = EXT4_SB(sb);
755 struct ext4_super_block *es = sbi->s_es;
399562b6 756 int aborted = 0;
ef2cabf7 757 int i, err;
ac27a0ec 758
857ac889 759 ext4_unregister_li_request(sb);
e0ccfd95
CH		 760 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
761
4c0425ff
MC		 762 flush_workqueue(sbi->dio_unwritten_wq);
763 destroy_workqueue(sbi->dio_unwritten_wq);
764
0390131b 765 if (sbi->s_journal) {
399562b6 766 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 767 err = jbd2_journal_destroy(sbi->s_journal);
768 sbi->s_journal = NULL;
399562b6 769 if ((err < 0) && !aborted)
c67d859e 770 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 771 }
d4edac31 772
74cd15cd 773 ext4_es_unregister_shrinker(sb);
a1c6c569 774 del_timer(&sbi->s_err_report);
d4edac31
JB		 775 ext4_release_system_zone(sb);
776 ext4_mb_release(sb);
777 ext4_ext_release(sb);
778 ext4_xattr_put_super(sb);
779
399562b6 780 if (!(sb->s_flags & MS_RDONLY) && !aborted) {
617ba13b 781 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 782 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 783 }
58c5873a 784 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 785 ext4_commit_super(sb, 1);
786
240799cd 787 if (sbi->s_proc) {
66acdcf4 788 remove_proc_entry("options", sbi->s_proc);
9f6200bb 789 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 790 }
3197ebdb 791 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 792
793 for (i = 0; i < sbi->s_gdb_count; i++)
794 brelse(sbi->s_group_desc[i]);
f18a5f21 795 ext4_kvfree(sbi->s_group_desc);
9933fc0a 796 ext4_kvfree(sbi->s_flex_groups);
57042651 797 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 798 percpu_counter_destroy(&sbi->s_freeinodes_counter);
799 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 800 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 801 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
ac27a0ec
DK		 802 brelse(sbi->s_sbh);
803#ifdef CONFIG_QUOTA
804 for (i = 0; i < MAXQUOTAS; i++)
805 kfree(sbi->s_qf_names[i]);
806#endif
807
808 /* Debugging code just in case the in-memory inode orphan list
809 * isn't empty. The on-disk one can be non-empty if we've
810 * detected an error and taken the fs readonly, but the
811 * in-memory list had better be clean by this point. */
812 if (!list_empty(&sbi->s_orphan))
813 dump_orphan_list(sb, sbi);
814 J_ASSERT(list_empty(&sbi->s_orphan));
815
b9f1b639 816 sync_blockdev(sb->s_bdev);
f98393a6 817 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 818 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
819 /*
820 * Invalidate the journal device's buffers. We don't want them
821 * floating about in memory - the physical journal device may
822 * hotswapped, and it breaks the `ro-after' testing code.
823 */
824 sync_blockdev(sbi->journal_bdev);
f98393a6 825 invalidate_bdev(sbi->journal_bdev);
617ba13b 826 ext4_blkdev_remove(sbi);
ac27a0ec 827 }
c5e06d10
JL		 828 if (sbi->s_mmp_tsk)
829 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 830 sb->s_fs_info = NULL;
3197ebdb
TT		 831 /*
832 * Now that we are completely done shutting down the
833 * superblock, we need to actually destroy the kobject.
834 */
3197ebdb
TT		 835 kobject_put(&sbi->s_kobj);
836 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 837 if (sbi->s_chksum_driver)
838 crypto_free_shash(sbi->s_chksum_driver);
705895b6 839 kfree(sbi->s_blockgroup_lock);
ac27a0ec 840 kfree(sbi);
ac27a0ec
DK		 841}
842
e18b890b 843static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 844
845/*
846 * Called inside transaction, so use GFP_NOFS
847 */
617ba13b 848static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 849{
617ba13b 850 struct ext4_inode_info *ei;
ac27a0ec 851
e6b4f8da 852 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 853 if (!ei)
854 return NULL;
0b8e58a1 855
ac27a0ec 856 ei->vfs_inode.i_version = 1;
c9de560d
AT		 857 INIT_LIST_HEAD(&ei->i_prealloc_list);
858 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 859 ext4_es_init_tree(&ei->i_es_tree);
860 rwlock_init(&ei->i_es_lock);
74cd15cd
ZL		 861 INIT_LIST_HEAD(&ei->i_es_lru);
862 ei->i_es_lru_nr = 0;
d2a17637
MC		 863 ei->i_reserved_data_blocks = 0;
864 ei->i_reserved_meta_blocks = 0;
865 ei->i_allocated_meta_blocks = 0;
9d0be502 866 ei->i_da_metadata_calc_len = 0;
7e731bc9 867 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 868 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 869#ifdef CONFIG_QUOTA
870 ei->i_reserved_quota = 0;
871#endif
8aefcd55 872 ei->jinode = NULL;
c7064ef1 873 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 874 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 875 ei->i_sync_tid = 0;
876 ei->i_datasync_tid = 0;
f7ad6d2e 877 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 878 atomic_set(&ei->i_unwritten, 0);
84c17543 879 INIT_WORK(&ei->i_unwritten_work, ext4_end_io_work);
0b8e58a1 880
ac27a0ec
DK		 881 return &ei->vfs_inode;
882}
883
7ff9c073
TT		 884static int ext4_drop_inode(struct inode *inode)
885{
886 int drop = generic_drop_inode(inode);
887
888 trace_ext4_drop_inode(inode, drop);
889 return drop;
890}
891
fa0d7e3d
NP		 892static void ext4_i_callback(struct rcu_head *head)
893{
894 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 895 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
896}
897
617ba13b 898static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 899{
9f7dd93d 900 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 901 ext4_msg(inode->i_sb, KERN_ERR,
902 "Inode %lu (%p): orphan list check failed!",
903 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 904 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
905 EXT4_I(inode), sizeof(struct ext4_inode_info),
906 true);
907 dump_stack();
908 }
fa0d7e3d 909 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 910}
911
51cc5068 912static void init_once(void *foo)
ac27a0ec 913{
617ba13b 914 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 915
a35afb83 916 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 917 init_rwsem(&ei->xattr_sem);
0e855ac8 918 init_rwsem(&ei->i_data_sem);
a35afb83 919 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 920}
921
922static int init_inodecache(void)
923{
617ba13b
MC		 924 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
925 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 926 0, (SLAB_RECLAIM_ACCOUNT|
927 SLAB_MEM_SPREAD),
20c2df83 928 init_once);
617ba13b 929 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 930 return -ENOMEM;
931 return 0;
932}
933
934static void destroy_inodecache(void)
935{
8c0a8537
KS		 936 /*
937 * Make sure all delayed rcu free inodes are flushed before we
938 * destroy cache.
939 */
940 rcu_barrier();
617ba13b 941 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 942}
943
0930fcc1 944void ext4_clear_inode(struct inode *inode)
ac27a0ec 945{
0930fcc1 946 invalidate_inode_buffers(inode);
dbd5768f 947 clear_inode(inode);
9f754758 948 dquot_drop(inode);
c2ea3fde 949 ext4_discard_preallocations(inode);
51865fda 950 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
74cd15cd 951 ext4_es_lru_del(inode);
8aefcd55
TT		 952 if (EXT4_I(inode)->jinode) {
953 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
954 EXT4_I(inode)->jinode);
955 jbd2_free_inode(EXT4_I(inode)->jinode);
956 EXT4_I(inode)->jinode = NULL;
957 }
ac27a0ec
DK		 958}
959
1b961ac0 960static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 961 u64 ino, u32 generation)
ac27a0ec 962{
ac27a0ec 963 struct inode *inode;
ac27a0ec 964
617ba13b 965 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 966 return ERR_PTR(-ESTALE);
617ba13b 967 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 968 return ERR_PTR(-ESTALE);
969
970 /* iget isn't really right if the inode is currently unallocated!!
971 *
617ba13b 972 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 973 * deleted, so we should be safe.
974 *
975 * Currently we don't know the generation for parent directory, so
976 * a generation of 0 means "accept any"
977 */
65f25799 978 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 979 if (IS_ERR(inode))
980 return ERR_CAST(inode);
981 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 982 iput(inode);
983 return ERR_PTR(-ESTALE);
984 }
1b961ac0
CH		 985
986 return inode;
987}
988
989static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 990 int fh_len, int fh_type)
1b961ac0
CH		 991{
992 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
993 ext4_nfs_get_inode);
994}
995
996static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 997 int fh_len, int fh_type)
1b961ac0
CH		 998{
999 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1000 ext4_nfs_get_inode);
ac27a0ec
DK		 1001}
1002
c39a7f84
TO		 1003/*
1004 * Try to release metadata pages (indirect blocks, directories) which are
1005 * mapped via the block device. Since these pages could have journal heads
1006 * which would prevent try_to_free_buffers() from freeing them, we must use
1007 * jbd2 layer's try_to_free_buffers() function to release them.
1008 */
0b8e58a1
AD		 1009static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1010 gfp_t wait)
c39a7f84
TO		 1011{
1012 journal_t *journal = EXT4_SB(sb)->s_journal;
1013
1014 WARN_ON(PageChecked(page));
1015 if (!page_has_buffers(page))
1016 return 0;
1017 if (journal)
1018 return jbd2_journal_try_to_free_buffers(journal, page,
1019 wait & ~__GFP_WAIT);
1020 return try_to_free_buffers(page);
1021}
1022
ac27a0ec 1023#ifdef CONFIG_QUOTA
af5bc92d 1024#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1025#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1026
617ba13b
MC		 1027static int ext4_write_dquot(struct dquot *dquot);
1028static int ext4_acquire_dquot(struct dquot *dquot);
1029static int ext4_release_dquot(struct dquot *dquot);
1030static int ext4_mark_dquot_dirty(struct dquot *dquot);
1031static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1032static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1033 struct path *path);
7c319d32
AK		 1034static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1035 int format_id);
ca0e05e4 1036static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1037static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1038static int ext4_quota_on_mount(struct super_block *sb, int type);
1039static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1040 size_t len, loff_t off);
617ba13b 1041static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1042 const char *data, size_t len, loff_t off);
7c319d32
AK		 1043static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1044 unsigned int flags);
1045static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1046
61e225dc 1047static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1048 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1049 .write_dquot = ext4_write_dquot,
1050 .acquire_dquot = ext4_acquire_dquot,
1051 .release_dquot = ext4_release_dquot,
1052 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1053 .write_info = ext4_write_info,
1054 .alloc_dquot = dquot_alloc,
1055 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1056};
1057
0d54b217 1058static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1059 .quota_on = ext4_quota_on,
ca0e05e4 1060 .quota_off = ext4_quota_off,
287a8095
CH		 1061 .quota_sync = dquot_quota_sync,
1062 .get_info = dquot_get_dqinfo,
1063 .set_info = dquot_set_dqinfo,
1064 .get_dqblk = dquot_get_dqblk,
1065 .set_dqblk = dquot_set_dqblk
ac27a0ec 1066};
7c319d32
AK		 1067
1068static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1069 .quota_on_meta = ext4_quota_on_sysfile,
1070 .quota_off = ext4_quota_off_sysfile,
1071 .quota_sync = dquot_quota_sync,
1072 .get_info = dquot_get_dqinfo,
1073 .set_info = dquot_set_dqinfo,
1074 .get_dqblk = dquot_get_dqblk,
1075 .set_dqblk = dquot_set_dqblk
1076};
ac27a0ec
DK		 1077#endif
1078
ee9b6d61 1079static const struct super_operations ext4_sops = {
617ba13b
MC		 1080 .alloc_inode = ext4_alloc_inode,
1081 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1082 .write_inode = ext4_write_inode,
1083 .dirty_inode = ext4_dirty_inode,
7ff9c073 1084 .drop_inode = ext4_drop_inode,
0930fcc1 1085 .evict_inode = ext4_evict_inode,
617ba13b 1086 .put_super = ext4_put_super,
617ba13b 1087 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1088 .freeze_fs = ext4_freeze,
1089 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1090 .statfs = ext4_statfs,
1091 .remount_fs = ext4_remount,
617ba13b 1092 .show_options = ext4_show_options,
ac27a0ec 1093#ifdef CONFIG_QUOTA
617ba13b
MC		 1094 .quota_read = ext4_quota_read,
1095 .quota_write = ext4_quota_write,
ac27a0ec 1096#endif
c39a7f84 1097 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1098};
1099
9ca92389
TT		 1100static const struct super_operations ext4_nojournal_sops = {
1101 .alloc_inode = ext4_alloc_inode,
1102 .destroy_inode = ext4_destroy_inode,
1103 .write_inode = ext4_write_inode,
1104 .dirty_inode = ext4_dirty_inode,
7ff9c073 1105 .drop_inode = ext4_drop_inode,
0930fcc1 1106 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1107 .put_super = ext4_put_super,
1108 .statfs = ext4_statfs,
1109 .remount_fs = ext4_remount,
9ca92389
TT		 1110 .show_options = ext4_show_options,
1111#ifdef CONFIG_QUOTA
1112 .quota_read = ext4_quota_read,
1113 .quota_write = ext4_quota_write,
1114#endif
1115 .bdev_try_to_free_page = bdev_try_to_free_page,
1116};
1117
39655164 1118static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1119 .fh_to_dentry = ext4_fh_to_dentry,
1120 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1121 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1122};
1123
1124enum {
1125 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1126 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1127 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1128 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1129 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1130 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1131 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1132 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1133 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1134 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1135 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1136 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1137 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1138 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1139 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1140 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1141 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1142 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1143 Opt_max_dir_size_kb,
ac27a0ec
DK		 1144};
1145
a447c093 1146static const match_table_t tokens = {
ac27a0ec
DK		 1147 {Opt_bsd_df, "bsddf"},
1148 {Opt_minix_df, "minixdf"},
1149 {Opt_grpid, "grpid"},
1150 {Opt_grpid, "bsdgroups"},
1151 {Opt_nogrpid, "nogrpid"},
1152 {Opt_nogrpid, "sysvgroups"},
1153 {Opt_resgid, "resgid=%u"},
1154 {Opt_resuid, "resuid=%u"},
1155 {Opt_sb, "sb=%u"},
1156 {Opt_err_cont, "errors=continue"},
1157 {Opt_err_panic, "errors=panic"},
1158 {Opt_err_ro, "errors=remount-ro"},
1159 {Opt_nouid32, "nouid32"},
ac27a0ec 1160 {Opt_debug, "debug"},
72578c33
TT		 1161 {Opt_removed, "oldalloc"},
1162 {Opt_removed, "orlov"},
ac27a0ec
DK		 1163 {Opt_user_xattr, "user_xattr"},
1164 {Opt_nouser_xattr, "nouser_xattr"},
1165 {Opt_acl, "acl"},
1166 {Opt_noacl, "noacl"},
e3bb52ae 1167 {Opt_noload, "norecovery"},
5a916be1 1168 {Opt_noload, "noload"},
72578c33
TT		 1169 {Opt_removed, "nobh"},
1170 {Opt_removed, "bh"},
ac27a0ec 1171 {Opt_commit, "commit=%u"},
30773840
TT		 1172 {Opt_min_batch_time, "min_batch_time=%u"},
1173 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1174 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1175 {Opt_journal_checksum, "journal_checksum"},
1176 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1177 {Opt_abort, "abort"},
1178 {Opt_data_journal, "data=journal"},
1179 {Opt_data_ordered, "data=ordered"},
1180 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1181 {Opt_data_err_abort, "data_err=abort"},
1182 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1183 {Opt_offusrjquota, "usrjquota="},
1184 {Opt_usrjquota, "usrjquota=%s"},
1185 {Opt_offgrpjquota, "grpjquota="},
1186 {Opt_grpjquota, "grpjquota=%s"},
1187 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1188 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1189 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1190 {Opt_grpquota, "grpquota"},
1191 {Opt_noquota, "noquota"},
1192 {Opt_quota, "quota"},
1193 {Opt_usrquota, "usrquota"},
1194 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1195 {Opt_barrier, "barrier"},
1196 {Opt_nobarrier, "nobarrier"},
25ec56b5 1197 {Opt_i_version, "i_version"},
c9de560d 1198 {Opt_stripe, "stripe=%u"},
64769240 1199 {Opt_delalloc, "delalloc"},
dd919b98 1200 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1201 {Opt_removed, "mblk_io_submit"},
1202 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1203 {Opt_block_validity, "block_validity"},
1204 {Opt_noblock_validity, "noblock_validity"},
240799cd 1205 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1206 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1207 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1208 {Opt_auto_da_alloc, "auto_da_alloc"},
1209 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1210 {Opt_dioread_nolock, "dioread_nolock"},
1211 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1212 {Opt_discard, "discard"},
1213 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1214 {Opt_init_itable, "init_itable=%u"},
1215 {Opt_init_itable, "init_itable"},
1216 {Opt_noinit_itable, "noinit_itable"},
df981d03 1217 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1218 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1219 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1220 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1221 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1222 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1223 {Opt_err, NULL},
ac27a0ec
DK		 1224};
1225
617ba13b 1226static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1227{
617ba13b 1228 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1229 char *options = (char *) *data;
1230
1231 if (!options || strncmp(options, "sb=", 3) != 0)
1232 return 1; /* Default location */
0b8e58a1 1233
ac27a0ec 1234 options += 3;
0b8e58a1 1235 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1236 sb_block = simple_strtoul(options, &options, 0);
1237 if (*options && *options != ',') {
4776004f 1238 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1239 (char *) *data);
1240 return 1;
1241 }
1242 if (*options == ',')
1243 options++;
1244 *data = (void *) options;
0b8e58a1 1245
ac27a0ec
DK		 1246 return sb_block;
1247}
1248
b3881f74 1249#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1250static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1251 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1252
56c50f11
DM		 1253#ifdef CONFIG_QUOTA
1254static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1255{
1256 struct ext4_sb_info *sbi = EXT4_SB(sb);
1257 char *qname;
03dafb5f 1258 int ret = -1;
56c50f11
DM		 1259
1260 if (sb_any_quota_loaded(sb) &&
1261 !sbi->s_qf_names[qtype]) {
1262 ext4_msg(sb, KERN_ERR,
1263 "Cannot change journaled "
1264 "quota options when quota turned on");
57f73c2c 1265 return -1;
56c50f11 1266 }
262b4662
JK		 1267 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1268 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1269 "when QUOTA feature is enabled");
1270 return -1;
1271 }
56c50f11
DM		 1272 qname = match_strdup(args);
1273 if (!qname) {
1274 ext4_msg(sb, KERN_ERR,
1275 "Not enough memory for storing quotafile name");
57f73c2c 1276 return -1;
56c50f11 1277 }
03dafb5f
CG		 1278 if (sbi->s_qf_names[qtype]) {
1279 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1280 ret = 1;
1281 else
1282 ext4_msg(sb, KERN_ERR,
1283 "%s quota file already specified",
1284 QTYPE2NAME(qtype));
1285 goto errout;
56c50f11 1286 }
03dafb5f 1287 if (strchr(qname, '/')) {
56c50f11
DM		 1288 ext4_msg(sb, KERN_ERR,
1289 "quotafile must be on filesystem root");
03dafb5f 1290 goto errout;
56c50f11 1291 }
03dafb5f 1292 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1293 set_opt(sb, QUOTA);
56c50f11 1294 return 1;
03dafb5f
CG		 1295errout:
1296 kfree(qname);
1297 return ret;
56c50f11
DM		 1298}
1299
1300static int clear_qf_name(struct super_block *sb, int qtype)
1301{
1302
1303 struct ext4_sb_info *sbi = EXT4_SB(sb);
1304
1305 if (sb_any_quota_loaded(sb) &&
1306 sbi->s_qf_names[qtype]) {
1307 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1308 " when quota turned on");
57f73c2c 1309 return -1;
56c50f11 1310 }
03dafb5f 1311 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1312 sbi->s_qf_names[qtype] = NULL;
1313 return 1;
1314}
1315#endif
1316
26092bf5
TT		 1317#define MOPT_SET 0x0001
1318#define MOPT_CLEAR 0x0002
1319#define MOPT_NOSUPPORT 0x0004
1320#define MOPT_EXPLICIT 0x0008
1321#define MOPT_CLEAR_ERR 0x0010
1322#define MOPT_GTE0 0x0020
ac27a0ec 1323#ifdef CONFIG_QUOTA
26092bf5
TT		 1324#define MOPT_Q 0
1325#define MOPT_QFMT 0x0040
1326#else
1327#define MOPT_Q MOPT_NOSUPPORT
1328#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1329#endif
26092bf5 1330#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1331#define MOPT_NO_EXT2 0x0100
1332#define MOPT_NO_EXT3 0x0200
1333#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
26092bf5
TT		 1334
1335static const struct mount_opts {
1336 int token;
1337 int mount_opt;
1338 int flags;
1339} ext4_mount_opts[] = {
1340 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1341 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1342 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1343 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1344 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1345 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1346 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1347 MOPT_EXT4_ONLY | MOPT_SET},
1348 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1349 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1350 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1351 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1352 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1353 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1354 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1929c51f 1355 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1356 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1357 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1358 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1359 EXT4_MOUNT_JOURNAL_CHECKSUM),
1360 MOPT_EXT4_ONLY | MOPT_SET},
1361 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1362 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1363 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1364 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1365 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1366 MOPT_NO_EXT2 | MOPT_SET},
1367 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1368 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1369 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1370 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1371 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1372 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1373 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1374 {Opt_commit, 0, MOPT_GTE0},
1375 {Opt_max_batch_time, 0, MOPT_GTE0},
1376 {Opt_min_batch_time, 0, MOPT_GTE0},
1377 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1378 {Opt_init_itable, 0, MOPT_GTE0},
1379 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1380 {Opt_resuid, 0, MOPT_GTE0},
1381 {Opt_resgid, 0, MOPT_GTE0},
1382 {Opt_journal_dev, 0, MOPT_GTE0},
1383 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1384 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1385 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1386 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1387 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1388 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1389 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1390#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1391 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1392 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1393#else
26092bf5
TT		 1394 {Opt_acl, 0, MOPT_NOSUPPORT},
1395 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1396#endif
26092bf5
TT		 1397 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1398 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1399 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1400 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1401 MOPT_SET | MOPT_Q},
1402 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1403 MOPT_SET | MOPT_Q},
1404 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1405 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1406 {Opt_usrjquota, 0, MOPT_Q},
1407 {Opt_grpjquota, 0, MOPT_Q},
1408 {Opt_offusrjquota, 0, MOPT_Q},
1409 {Opt_offgrpjquota, 0, MOPT_Q},
1410 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1411 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1412 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1413 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1414 {Opt_err, 0, 0}
1415};
1416
1417static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1418 substring_t *args, unsigned long *journal_devnum,
1419 unsigned int *journal_ioprio, int is_remount)
1420{
1421 struct ext4_sb_info *sbi = EXT4_SB(sb);
1422 const struct mount_opts *m;
08cefc7a
EB		 1423 kuid_t uid;
1424 kgid_t gid;
26092bf5
TT		 1425 int arg = 0;
1426
57f73c2c
TT		 1427#ifdef CONFIG_QUOTA
1428 if (token == Opt_usrjquota)
1429 return set_qf_name(sb, USRQUOTA, &args[0]);
1430 else if (token == Opt_grpjquota)
1431 return set_qf_name(sb, GRPQUOTA, &args[0]);
1432 else if (token == Opt_offusrjquota)
1433 return clear_qf_name(sb, USRQUOTA);
1434 else if (token == Opt_offgrpjquota)
1435 return clear_qf_name(sb, GRPQUOTA);
1436#endif
26092bf5 1437 switch (token) {
f7048605
TT		 1438 case Opt_noacl:
1439 case Opt_nouser_xattr:
1440 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1441 break;
26092bf5
TT		 1442 case Opt_sb:
1443 return 1; /* handled by get_sb_block() */
1444 case Opt_removed:
5f3633e3 1445 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1446 return 1;
26092bf5
TT		 1447 case Opt_abort:
1448 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1449 return 1;
1450 case Opt_i_version:
1451 sb->s_flags |= MS_I_VERSION;
1452 return 1;
26092bf5
TT		 1453 }
1454
5f3633e3
JK		 1455 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1456 if (token == m->token)
1457 break;
1458
1459 if (m->token == Opt_err) {
1460 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1461 "or missing value", opt);
1462 return -1;
1463 }
1464
8dc0aa8c
TT		 1465 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1466 ext4_msg(sb, KERN_ERR,
1467 "Mount option \"%s\" incompatible with ext2", opt);
1468 return -1;
1469 }
1470 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1471 ext4_msg(sb, KERN_ERR,
1472 "Mount option \"%s\" incompatible with ext3", opt);
1473 return -1;
1474 }
1475
5f3633e3
JK		 1476 if (args->from && match_int(args, &arg))
1477 return -1;
1478 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1479 return -1;
1480 if (m->flags & MOPT_EXPLICIT)
1481 set_opt2(sb, EXPLICIT_DELALLOC);
1482 if (m->flags & MOPT_CLEAR_ERR)
1483 clear_opt(sb, ERRORS_MASK);
1484 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1485 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1486 "options when quota turned on");
1487 return -1;
1488 }
1489
1490 if (m->flags & MOPT_NOSUPPORT) {
1491 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1492 } else if (token == Opt_commit) {
1493 if (arg == 0)
1494 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1495 sbi->s_commit_interval = HZ * arg;
1496 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1497 sbi->s_max_batch_time = arg;
1498 } else if (token == Opt_min_batch_time) {
1499 sbi->s_min_batch_time = arg;
1500 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1501 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1502 ext4_msg(sb, KERN_ERR,
1503 "EXT4-fs: inode_readahead_blks must be "
1504 "0 or a power of 2 smaller than 2^31");
26092bf5 1505 return -1;
5f3633e3
JK		 1506 }
1507 sbi->s_inode_readahead_blks = arg;
1508 } else if (token == Opt_init_itable) {
1509 set_opt(sb, INIT_INODE_TABLE);
1510 if (!args->from)
1511 arg = EXT4_DEF_LI_WAIT_MULT;
1512 sbi->s_li_wait_mult = arg;
1513 } else if (token == Opt_max_dir_size_kb) {
1514 sbi->s_max_dir_size_kb = arg;
1515 } else if (token == Opt_stripe) {
1516 sbi->s_stripe = arg;
1517 } else if (token == Opt_resuid) {
1518 uid = make_kuid(current_user_ns(), arg);
1519 if (!uid_valid(uid)) {
1520 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1521 return -1;
1522 }
5f3633e3
JK		 1523 sbi->s_resuid = uid;
1524 } else if (token == Opt_resgid) {
1525 gid = make_kgid(current_user_ns(), arg);
1526 if (!gid_valid(gid)) {
1527 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1528 return -1;
1529 }
1530 sbi->s_resgid = gid;
1531 } else if (token == Opt_journal_dev) {
1532 if (is_remount) {
1533 ext4_msg(sb, KERN_ERR,
1534 "Cannot specify journal on remount");
1535 return -1;
1536 }
1537 *journal_devnum = arg;
1538 } else if (token == Opt_journal_ioprio) {
1539 if (arg > 7) {
1540 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1541 " (must be 0-7)");
1542 return -1;
1543 }
1544 *journal_ioprio =
1545 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1546 } else if (m->flags & MOPT_DATAJ) {
1547 if (is_remount) {
1548 if (!sbi->s_journal)
1549 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1550 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1551 ext4_msg(sb, KERN_ERR,
26092bf5 1552 "Cannot change data mode on remount");
26092bf5 1553 return -1;
ac27a0ec 1554 }
26092bf5 1555 } else {
5f3633e3
JK		 1556 clear_opt(sb, DATA_FLAGS);
1557 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1558 }
5f3633e3
JK		 1559#ifdef CONFIG_QUOTA
1560 } else if (m->flags & MOPT_QFMT) {
1561 if (sb_any_quota_loaded(sb) &&
1562 sbi->s_jquota_fmt != m->mount_opt) {
1563 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1564 "quota options when quota turned on");
1565 return -1;
1566 }
262b4662
JK		 1567 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1568 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1569 ext4_msg(sb, KERN_ERR,
1570 "Cannot set journaled quota options "
1571 "when QUOTA feature is enabled");
1572 return -1;
1573 }
5f3633e3
JK		 1574 sbi->s_jquota_fmt = m->mount_opt;
1575#endif
1576 } else {
1577 if (!args->from)
1578 arg = 1;
1579 if (m->flags & MOPT_CLEAR)
1580 arg = !arg;
1581 else if (unlikely(!(m->flags & MOPT_SET))) {
1582 ext4_msg(sb, KERN_WARNING,
1583 "buggy handling of option %s", opt);
1584 WARN_ON(1);
1585 return -1;
1586 }
1587 if (arg != 0)
1588 sbi->s_mount_opt |= m->mount_opt;
1589 else
1590 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1591 }
5f3633e3 1592 return 1;
26092bf5
TT		 1593}
1594
1595static int parse_options(char *options, struct super_block *sb,
1596 unsigned long *journal_devnum,
1597 unsigned int *journal_ioprio,
1598 int is_remount)
1599{
1600 struct ext4_sb_info *sbi = EXT4_SB(sb);
1601 char *p;
1602 substring_t args[MAX_OPT_ARGS];
1603 int token;
1604
1605 if (!options)
1606 return 1;
1607
1608 while ((p = strsep(&options, ",")) != NULL) {
1609 if (!*p)
1610 continue;
1611 /*
1612 * Initialize args struct so we know whether arg was
1613 * found; some options take optional arguments.
1614 */
caecd0af 1615 args[0].to = args[0].from = NULL;
26092bf5
TT		 1616 token = match_token(p, tokens, args);
1617 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1618 journal_ioprio, is_remount) < 0)
1619 return 0;
ac27a0ec
DK		 1620 }
1621#ifdef CONFIG_QUOTA
262b4662
JK		 1622 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1623 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1624 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1625 "feature is enabled");
1626 return 0;
1627 }
ac27a0ec 1628 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1629 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1630 clear_opt(sb, USRQUOTA);
ac27a0ec 1631
482a7425 1632 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1633 clear_opt(sb, GRPQUOTA);
ac27a0ec 1634
56c50f11 1635 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1636 ext4_msg(sb, KERN_ERR, "old and new quota "
1637 "format mixing");
ac27a0ec
DK		 1638 return 0;
1639 }
1640
1641 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1642 ext4_msg(sb, KERN_ERR, "journaled quota format "
1643 "not specified");
ac27a0ec
DK		 1644 return 0;
1645 }
ac27a0ec
DK		 1646 }
1647#endif
261cb20c
JK		 1648 if (test_opt(sb, DIOREAD_NOLOCK)) {
1649 int blocksize =
1650 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1651
1652 if (blocksize < PAGE_CACHE_SIZE) {
1653 ext4_msg(sb, KERN_ERR, "can't mount with "
1654 "dioread_nolock if block size != PAGE_SIZE");
1655 return 0;
1656 }
1657 }
ac27a0ec
DK		 1658 return 1;
1659}
1660
2adf6da8
TT		 1661static inline void ext4_show_quota_options(struct seq_file *seq,
1662 struct super_block *sb)
1663{
1664#if defined(CONFIG_QUOTA)
1665 struct ext4_sb_info *sbi = EXT4_SB(sb);
1666
1667 if (sbi->s_jquota_fmt) {
1668 char *fmtname = "";
1669
1670 switch (sbi->s_jquota_fmt) {
1671 case QFMT_VFS_OLD:
1672 fmtname = "vfsold";
1673 break;
1674 case QFMT_VFS_V0:
1675 fmtname = "vfsv0";
1676 break;
1677 case QFMT_VFS_V1:
1678 fmtname = "vfsv1";
1679 break;
1680 }
1681 seq_printf(seq, ",jqfmt=%s", fmtname);
1682 }
1683
1684 if (sbi->s_qf_names[USRQUOTA])
1685 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1686
1687 if (sbi->s_qf_names[GRPQUOTA])
1688 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1689#endif
1690}
1691
5a916be1
TT		 1692static const char *token2str(int token)
1693{
50df9fd5 1694 const struct match_token *t;
5a916be1
TT		 1695
1696 for (t = tokens; t->token != Opt_err; t++)
1697 if (t->token == token && !strchr(t->pattern, '='))
1698 break;
1699 return t->pattern;
1700}
1701
2adf6da8
TT		 1702/*
1703 * Show an option if
1704 * - it's set to a non-default value OR
1705 * - if the per-sb default is different from the global default
1706 */
66acdcf4
TT		 1707static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1708 int nodefs)
2adf6da8 1709{
2adf6da8
TT		 1710 struct ext4_sb_info *sbi = EXT4_SB(sb);
1711 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1712 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1713 const struct mount_opts *m;
66acdcf4 1714 char sep = nodefs ? '\n' : ',';
2adf6da8 1715
66acdcf4
TT		 1716#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1717#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1718
1719 if (sbi->s_sb_block != 1)
5a916be1
TT		 1720 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1721
1722 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1723 int want_set = m->flags & MOPT_SET;
1724 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1725 (m->flags & MOPT_CLEAR_ERR))
1726 continue;
66acdcf4 1727 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1728 continue; /* skip if same as the default */
1729 if ((want_set &&
1730 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1731 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1732 continue; /* select Opt_noFoo vs Opt_Foo */
1733 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1734 }
5a916be1 1735
08cefc7a 1736 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1737 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1738 SEQ_OPTS_PRINT("resuid=%u",
1739 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1740 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1741 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1742 SEQ_OPTS_PRINT("resgid=%u",
1743 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1744 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1745 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1746 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1747 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1748 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1749 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1750 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1751 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1752 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1753 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1754 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1755 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1756 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1757 if (sb->s_flags & MS_I_VERSION)
5a916be1 1758 SEQ_OPTS_PUTS("i_version");
66acdcf4 1759 if (nodefs || sbi->s_stripe)
5a916be1 1760 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1761 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1762 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1763 SEQ_OPTS_PUTS("data=journal");
1764 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1765 SEQ_OPTS_PUTS("data=ordered");
1766 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1767 SEQ_OPTS_PUTS("data=writeback");
1768 }
66acdcf4
TT		 1769 if (nodefs ||
1770 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1771 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1772 sbi->s_inode_readahead_blks);
2adf6da8 1773
66acdcf4
TT		 1774 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1775 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1776 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1777 if (nodefs || sbi->s_max_dir_size_kb)
1778 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1779
1780 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1781 return 0;
1782}
1783
66acdcf4
TT		 1784static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1785{
1786 return _ext4_show_options(seq, root->d_sb, 0);
1787}
1788
1789static int options_seq_show(struct seq_file *seq, void *offset)
1790{
1791 struct super_block *sb = seq->private;
1792 int rc;
1793
1794 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1795 rc = _ext4_show_options(seq, sb, 1);
1796 seq_puts(seq, "\n");
1797 return rc;
1798}
1799
1800static int options_open_fs(struct inode *inode, struct file *file)
1801{
d9dda78b 1802 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1803}
1804
1805static const struct file_operations ext4_seq_options_fops = {
1806 .owner = THIS_MODULE,
1807 .open = options_open_fs,
1808 .read = seq_read,
1809 .llseek = seq_lseek,
1810 .release = single_release,
1811};
1812
617ba13b 1813static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1814 int read_only)
1815{
617ba13b 1816 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1817 int res = 0;
1818
617ba13b 1819 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1820 ext4_msg(sb, KERN_ERR, "revision level too high, "
1821 "forcing read-only mode");
ac27a0ec
DK		 1822 res = MS_RDONLY;
1823 }
1824 if (read_only)
281b5995 1825 goto done;
617ba13b 1826 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1827 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1828 "running e2fsck is recommended");
617ba13b 1829 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1830 ext4_msg(sb, KERN_WARNING,
1831 "warning: mounting fs with errors, "
1832 "running e2fsck is recommended");
ed3ce80a 1833 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1834 le16_to_cpu(es->s_mnt_count) >=
1835 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1836 ext4_msg(sb, KERN_WARNING,
1837 "warning: maximal mount count reached, "
1838 "running e2fsck is recommended");
ac27a0ec
DK		 1839 else if (le32_to_cpu(es->s_checkinterval) &&
1840 (le32_to_cpu(es->s_lastcheck) +
1841 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1842 ext4_msg(sb, KERN_WARNING,
1843 "warning: checktime reached, "
1844 "running e2fsck is recommended");
0b8e58a1 1845 if (!sbi->s_journal)
0390131b 1846 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1847 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1848 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1849 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1850 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1851 ext4_update_dynamic_rev(sb);
0390131b
FM		 1852 if (sbi->s_journal)
1853 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1854
e2d67052 1855 ext4_commit_super(sb, 1);
281b5995 1856done:
ac27a0ec 1857 if (test_opt(sb, DEBUG))
a9df9a49 1858 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1859 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1860 sb->s_blocksize,
1861 sbi->s_groups_count,
617ba13b
MC		 1862 EXT4_BLOCKS_PER_GROUP(sb),
1863 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1864 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1865
7abc52c2 1866 cleancache_init_fs(sb);
ac27a0ec
DK		 1867 return res;
1868}
1869
117fff10
TT		 1870int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1871{
1872 struct ext4_sb_info *sbi = EXT4_SB(sb);
1873 struct flex_groups *new_groups;
1874 int size;
1875
1876 if (!sbi->s_log_groups_per_flex)
1877 return 0;
1878
1879 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1880 if (size <= sbi->s_flex_groups_allocated)
1881 return 0;
1882
1883 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1884 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1885 if (!new_groups) {
1886 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1887 size / (int) sizeof(struct flex_groups));
1888 return -ENOMEM;
1889 }
1890
1891 if (sbi->s_flex_groups) {
1892 memcpy(new_groups, sbi->s_flex_groups,
1893 (sbi->s_flex_groups_allocated *
1894 sizeof(struct flex_groups)));
1895 ext4_kvfree(sbi->s_flex_groups);
1896 }
1897 sbi->s_flex_groups = new_groups;
1898 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1899 return 0;
1900}
1901
772cb7c8
JS		 1902static int ext4_fill_flex_info(struct super_block *sb)
1903{
1904 struct ext4_sb_info *sbi = EXT4_SB(sb);
1905 struct ext4_group_desc *gdp = NULL;
772cb7c8 1906 ext4_group_t flex_group;
d50f2ab6 1907 unsigned int groups_per_flex = 0;
117fff10 1908 int i, err;
772cb7c8 1909
503358ae 1910 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1911 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1912 sbi->s_log_groups_per_flex = 0;
1913 return 1;
1914 }
76495ec1 1915 groups_per_flex = 1U << sbi->s_log_groups_per_flex;
772cb7c8 1916
117fff10
TT		 1917 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1918 if (err)
9933fc0a 1919 goto failed;
772cb7c8 1920
772cb7c8 1921 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1922 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1923
1924 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1925 atomic_add(ext4_free_inodes_count(sb, gdp),
1926 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1927 atomic64_add(ext4_free_group_clusters(sb, gdp),
1928 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1929 atomic_add(ext4_used_dirs_count(sb, gdp),
1930 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1931 }
1932
1933 return 1;
1934failed:
1935 return 0;
1936}
1937
feb0ab32
DW		 1938static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1939 struct ext4_group_desc *gdp)
717d50e4 1940{
3a45bbb2 1941 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 1942 __u16 crc = 0;
feb0ab32 1943 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1944
feb0ab32
DW		 1945 if ((sbi->s_es->s_feature_ro_compat &
1946 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1947 /* Use new metadata_csum algorithm */
feb0ab32 1948 __u32 csum32;
3a45bbb2 1949 __u16 dummy_csum = 0;
feb0ab32 1950
feb0ab32
DW		 1951 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1952 sizeof(le_group));
3a45bbb2
DJ		 1953 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
1954 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
1955 sizeof(dummy_csum));
1956 offset += sizeof(dummy_csum);
1957 if (offset < sbi->s_desc_size)
1958 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
1959 sbi->s_desc_size - offset);
feb0ab32
DW		 1960
1961 crc = csum32 & 0xFFFF;
1962 goto out;
717d50e4
AD		 1963 }
1964
feb0ab32 1965 /* old crc16 code */
209f5484
DW		 1966 if (!(sbi->s_es->s_feature_ro_compat &
1967 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
1968 return 0;
1969
feb0ab32
DW		 1970 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1971 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1972 crc = crc16(crc, (__u8 *)gdp, offset);
1973 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1974 /* for checksum of struct ext4_group_desc do the rest...*/
1975 if ((sbi->s_es->s_feature_incompat &
1976 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1977 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1978 crc = crc16(crc, (__u8 *)gdp + offset,
1979 le16_to_cpu(sbi->s_es->s_desc_size) -
1980 offset);
1981
1982out:
717d50e4
AD		 1983 return cpu_to_le16(crc);
1984}
1985
feb0ab32 1986int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 1987 struct ext4_group_desc *gdp)
1988{
feb0ab32
DW		 1989 if (ext4_has_group_desc_csum(sb) &&
1990 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
1991 block_group, gdp)))
717d50e4
AD		 1992 return 0;
1993
1994 return 1;
1995}
1996
feb0ab32
DW		 1997void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
1998 struct ext4_group_desc *gdp)
1999{
2000 if (!ext4_has_group_desc_csum(sb))
2001 return;
2002 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2003}
2004
ac27a0ec 2005/* Called at mount-time, super-block is locked */
bfff6873 2006static int ext4_check_descriptors(struct super_block *sb,
7d506613 2007 ext4_fsblk_t sb_block,
bfff6873 2008 ext4_group_t *first_not_zeroed)
ac27a0ec 2009{
617ba13b
MC		 2010 struct ext4_sb_info *sbi = EXT4_SB(sb);
2011 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2012 ext4_fsblk_t last_block;
bd81d8ee
LV		 2013 ext4_fsblk_t block_bitmap;
2014 ext4_fsblk_t inode_bitmap;
2015 ext4_fsblk_t inode_table;
ce421581 2016 int flexbg_flag = 0;
bfff6873 2017 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2018
ce421581
JS		 2019 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2020 flexbg_flag = 1;
2021
af5bc92d 2022 ext4_debug("Checking group descriptors");
ac27a0ec 2023
197cd65a
AM		 2024 for (i = 0; i < sbi->s_groups_count; i++) {
2025 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2026
ce421581 2027 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2028 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2029 else
2030 last_block = first_block +
617ba13b 2031 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2032
bfff6873
LC		 2033 if ((grp == sbi->s_groups_count) &&
2034 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2035 grp = i;
2036
8fadc143 2037 block_bitmap = ext4_block_bitmap(sb, gdp);
7d506613
TT		 2038 if (block_bitmap == sb_block) {
2039 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2040 "Block bitmap for group %u overlaps "
2041 "superblock", i);
2042 }
2b2d6d01 2043 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2044 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2045 "Block bitmap for group %u not in group "
b31e1552 2046 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2047 return 0;
2048 }
8fadc143 2049 inode_bitmap = ext4_inode_bitmap(sb, gdp);
7d506613
TT		 2050 if (inode_bitmap == sb_block) {
2051 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2052 "Inode bitmap for group %u overlaps "
2053 "superblock", i);
2054 }
2b2d6d01 2055 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2056 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2057 "Inode bitmap for group %u not in group "
b31e1552 2058 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2059 return 0;
2060 }
8fadc143 2061 inode_table = ext4_inode_table(sb, gdp);
7d506613
TT		 2062 if (inode_table == sb_block) {
2063 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2064 "Inode table for group %u overlaps "
2065 "superblock", i);
2066 }
bd81d8ee 2067 if (inode_table < first_block ||
2b2d6d01 2068 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2069 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2070 "Inode table for group %u not in group "
b31e1552 2071 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2072 return 0;
2073 }
955ce5f5 2074 ext4_lock_group(sb, i);
feb0ab32 2075 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2076 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2077 "Checksum for group %u failed (%u!=%u)",
2078 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2079 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2080 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2081 ext4_unlock_group(sb, i);
8a266467 2082 return 0;
7ee1ec4c 2083 }
717d50e4 2084 }
955ce5f5 2085 ext4_unlock_group(sb, i);
ce421581
JS		 2086 if (!flexbg_flag)
2087 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2088 }
bfff6873
LC		 2089 if (NULL != first_not_zeroed)
2090 *first_not_zeroed = grp;
ac27a0ec 2091
5dee5437
TT		 2092 ext4_free_blocks_count_set(sbi->s_es,
2093 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2094 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2095 return 1;
2096}
2097
617ba13b 2098/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2099 * the superblock) which were deleted from all directories, but held open by
2100 * a process at the time of a crash. We walk the list and try to delete these
2101 * inodes at recovery time (only with a read-write filesystem).
2102 *
2103 * In order to keep the orphan inode chain consistent during traversal (in
2104 * case of crash during recovery), we link each inode into the superblock
2105 * orphan list_head and handle it the same way as an inode deletion during
2106 * normal operation (which journals the operations for us).
2107 *
2108 * We only do an iget() and an iput() on each inode, which is very safe if we
2109 * accidentally point at an in-use or already deleted inode. The worst that
2110 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2111 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2112 * e2fsck was run on this filesystem, and it must have already done the orphan
2113 * inode cleanup for us, so we can safely abort without any further action.
2114 */
2b2d6d01
TT		 2115static void ext4_orphan_cleanup(struct super_block *sb,
2116 struct ext4_super_block *es)
ac27a0ec
DK		 2117{
2118 unsigned int s_flags = sb->s_flags;
2119 int nr_orphans = 0, nr_truncates = 0;
2120#ifdef CONFIG_QUOTA
2121 int i;
2122#endif
2123 if (!es->s_last_orphan) {
2124 jbd_debug(4, "no orphan inodes to clean up\n");
2125 return;
2126 }
2127
a8f48a95 2128 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2129 ext4_msg(sb, KERN_ERR, "write access "
2130 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2131 return;
2132 }
2133
d39195c3
AG		 2134 /* Check if feature set would not allow a r/w mount */
2135 if (!ext4_feature_set_ok(sb, 0)) {
2136 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2137 "unknown ROCOMPAT features");
2138 return;
2139 }
2140
617ba13b 2141 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2142 /* don't clear list on RO mount w/ errors */
2143 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
ac27a0ec
DK		 2144 jbd_debug(1, "Errors on filesystem, "
2145 "clearing orphan list.\n");
c25f9bc6
ES		 2146 es->s_last_orphan = 0;
2147 }
ac27a0ec
DK		 2148 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2149 return;
2150 }
2151
2152 if (s_flags & MS_RDONLY) {
b31e1552 2153 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2154 sb->s_flags &= ~MS_RDONLY;
2155 }
2156#ifdef CONFIG_QUOTA
2157 /* Needed for iput() to work correctly and not trash data */
2158 sb->s_flags |= MS_ACTIVE;
2159 /* Turn on quotas so that they are updated correctly */
2160 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2161 if (EXT4_SB(sb)->s_qf_names[i]) {
2162 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2163 if (ret < 0)
b31e1552
ES		 2164 ext4_msg(sb, KERN_ERR,
2165 "Cannot turn on journaled "
2166 "quota: error %d", ret);
ac27a0ec
DK		 2167 }
2168 }
2169#endif
2170
2171 while (es->s_last_orphan) {
2172 struct inode *inode;
2173
bf86199b
VN		 2174 /*
2175 * We may have encountered an error during cleanup; if
2176 * so, skip the rest.
2177 */
2178 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2179 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2180 es->s_last_orphan = 0;
2181 break;
2182 }
2183
97bd42b9
JB		 2184 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2185 if (IS_ERR(inode)) {
ac27a0ec
DK		 2186 es->s_last_orphan = 0;
2187 break;
2188 }
2189
617ba13b 2190 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2191 dquot_initialize(inode);
ac27a0ec 2192 if (inode->i_nlink) {
b31e1552
ES		 2193 ext4_msg(sb, KERN_DEBUG,
2194 "%s: truncating inode %lu to %lld bytes",
46e665e9 2195 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2196 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2197 inode->i_ino, inode->i_size);
721e3eba 2198 mutex_lock(&inode->i_mutex);
617ba13b 2199 ext4_truncate(inode);
721e3eba 2200 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2201 nr_truncates++;
2202 } else {
b31e1552
ES		 2203 ext4_msg(sb, KERN_DEBUG,
2204 "%s: deleting unreferenced inode %lu",
46e665e9 2205 __func__, inode->i_ino);
ac27a0ec
DK		 2206 jbd_debug(2, "deleting unreferenced inode %lu\n",
2207 inode->i_ino);
2208 nr_orphans++;
2209 }
2210 iput(inode); /* The delete magic happens here! */
2211 }
2212
2b2d6d01 2213#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2214
2215 if (nr_orphans)
b31e1552
ES		 2216 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2217 PLURAL(nr_orphans));
ac27a0ec 2218 if (nr_truncates)
b31e1552
ES		 2219 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2220 PLURAL(nr_truncates));
ac27a0ec
DK		 2221#ifdef CONFIG_QUOTA
2222 /* Turn quotas off */
2223 for (i = 0; i < MAXQUOTAS; i++) {
2224 if (sb_dqopt(sb)->files[i])
287a8095 2225 dquot_quota_off(sb, i);
ac27a0ec
DK		 2226 }
2227#endif
2228 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2229}
0b8e58a1 2230
cd2291a4
ES		 2231/*
2232 * Maximal extent format file size.
2233 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2234 * extent format containers, within a sector_t, and within i_blocks
2235 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2236 * so that won't be a limiting factor.
2237 *
f17722f9
LC		 2238 * However there is other limiting factor. We do store extents in the form
2239 * of starting block and length, hence the resulting length of the extent
2240 * covering maximum file size must fit into on-disk format containers as
2241 * well. Given that length is always by 1 unit bigger than max unit (because
2242 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2243 *
cd2291a4
ES		 2244 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2245 */
f287a1a5 2246static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2247{
2248 loff_t res;
2249 loff_t upper_limit = MAX_LFS_FILESIZE;
2250
2251 /* small i_blocks in vfs inode? */
f287a1a5 2252 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2253 /*
90c699a9 2254 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2255 * i_block represent total blocks in 512 bytes
2256 * 32 == size of vfs inode i_blocks * 8
2257 */
2258 upper_limit = (1LL << 32) - 1;
2259
2260 /* total blocks in file system block size */
2261 upper_limit >>= (blkbits - 9);
2262 upper_limit <<= blkbits;
2263 }
2264
f17722f9
LC		 2265 /*
2266 * 32-bit extent-start container, ee_block. We lower the maxbytes
2267 * by one fs block, so ee_len can cover the extent of maximum file
2268 * size
2269 */
2270 res = (1LL << 32) - 1;
cd2291a4 2271 res <<= blkbits;
cd2291a4
ES		 2272
2273 /* Sanity check against vm- & vfs- imposed limits */
2274 if (res > upper_limit)
2275 res = upper_limit;
2276
2277 return res;
2278}
ac27a0ec 2279
ac27a0ec 2280/*
cd2291a4 2281 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2282 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2283 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2284 */
f287a1a5 2285static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2286{
617ba13b 2287 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2288 int meta_blocks;
2289 loff_t upper_limit;
0b8e58a1
AD		 2290 /* This is calculated to be the largest file size for a dense, block
2291 * mapped file such that the file's total number of 512-byte sectors,
2292 * including data and all indirect blocks, does not exceed (2^48 - 1).
2293 *
2294 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2295 * number of 512-byte sectors of the file.
0fc1b451
AK		 2296 */
2297
f287a1a5 2298 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2299 /*
90c699a9 2300 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2301 * the inode i_block field represents total file blocks in
2302 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2303 */
2304 upper_limit = (1LL << 32) - 1;
2305
2306 /* total blocks in file system block size */
2307 upper_limit >>= (bits - 9);
2308
2309 } else {
8180a562
AK		 2310 /*
2311 * We use 48 bit ext4_inode i_blocks
2312 * With EXT4_HUGE_FILE_FL set the i_blocks
2313 * represent total number of blocks in
2314 * file system block size
2315 */
0fc1b451
AK		 2316 upper_limit = (1LL << 48) - 1;
2317
0fc1b451
AK		 2318 }
2319
2320 /* indirect blocks */
2321 meta_blocks = 1;
2322 /* double indirect blocks */
2323 meta_blocks += 1 + (1LL << (bits-2));
2324 /* tripple indirect blocks */
2325 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2326
2327 upper_limit -= meta_blocks;
2328 upper_limit <<= bits;
ac27a0ec
DK		 2329
2330 res += 1LL << (bits-2);
2331 res += 1LL << (2*(bits-2));
2332 res += 1LL << (3*(bits-2));
2333 res <<= bits;
2334 if (res > upper_limit)
2335 res = upper_limit;
0fc1b451
AK		 2336
2337 if (res > MAX_LFS_FILESIZE)
2338 res = MAX_LFS_FILESIZE;
2339
ac27a0ec
DK		 2340 return res;
2341}
2342
617ba13b 2343static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2344 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2345{
617ba13b 2346 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2347 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2348 int has_super = 0;
2349
2350 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2351
617ba13b 2352 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2353 nr < first_meta_bg)
70bbb3e0 2354 return logical_sb_block + nr + 1;
ac27a0ec 2355 bg = sbi->s_desc_per_block * nr;
617ba13b 2356 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2357 has_super = 1;
0b8e58a1 2358
617ba13b 2359 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2360}
2361
c9de560d
AT		 2362/**
2363 * ext4_get_stripe_size: Get the stripe size.
2364 * @sbi: In memory super block info
2365 *
2366 * If we have specified it via mount option, then
2367 * use the mount option value. If the value specified at mount time is
2368 * greater than the blocks per group use the super block value.
2369 * If the super block value is greater than blocks per group return 0.
2370 * Allocator needs it be less than blocks per group.
2371 *
2372 */
2373static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2374{
2375 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2376 unsigned long stripe_width =
2377 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2378 int ret;
c9de560d
AT		 2379
2380 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2381 ret = sbi->s_stripe;
2382 else if (stripe_width <= sbi->s_blocks_per_group)
2383 ret = stripe_width;
2384 else if (stride <= sbi->s_blocks_per_group)
2385 ret = stride;
2386 else
2387 ret = 0;
c9de560d 2388
3eb08658
DE		 2389 /*
2390 * If the stripe width is 1, this makes no sense and
2391 * we set it to 0 to turn off stripe handling code.
2392 */
2393 if (ret <= 1)
2394 ret = 0;
c9de560d 2395
3eb08658 2396 return ret;
c9de560d 2397}
ac27a0ec 2398
3197ebdb
TT		 2399/* sysfs supprt */
2400
2401struct ext4_attr {
2402 struct attribute attr;
2403 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2404 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2405 const char *, size_t);
2406 int offset;
2407};
2408
27dd4385
LC		 2409static int parse_strtoull(const char *buf,
2410 unsigned long long max, unsigned long long *value)
2411{
2412 int ret;
2413
2414 ret = kstrtoull(skip_spaces(buf), 0, value);
2415 if (!ret && *value > max)
2416 ret = -EINVAL;
2417 return ret;
2418}
2419
3197ebdb
TT		 2420static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2421 struct ext4_sb_info *sbi,
2422 char *buf)
2423{
2424 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2425 (s64) EXT4_C2B(sbi,
2426 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2427}
2428
2429static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2430 struct ext4_sb_info *sbi, char *buf)
2431{
2432 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2433
f613dfcb
TT		 2434 if (!sb->s_bdev->bd_part)
2435 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2436 return snprintf(buf, PAGE_SIZE, "%lu\n",
2437 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2438 sbi->s_sectors_written_start) >> 1);
2439}
2440
2441static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2442 struct ext4_sb_info *sbi, char *buf)
2443{
2444 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2445
f613dfcb
TT		 2446 if (!sb->s_bdev->bd_part)
2447 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2448 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2449 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2450 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2451 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2452}
2453
2454static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2455 struct ext4_sb_info *sbi,
2456 const char *buf, size_t count)
2457{
2458 unsigned long t;
e1091b15 2459 int ret;
3197ebdb 2460
e1091b15
LC		 2461 ret = kstrtoul(skip_spaces(buf), 0, &t);
2462 if (ret)
2463 return ret;
3197ebdb 2464
e1091b15 2465 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2466 return -EINVAL;
2467
2468 sbi->s_inode_readahead_blks = t;
2469 return count;
2470}
2471
2472static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2473 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2474{
2475 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2476
2477 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2478}
2479
2480static ssize_t sbi_ui_store(struct ext4_attr *a,
2481 struct ext4_sb_info *sbi,
2482 const char *buf, size_t count)
2483{
2484 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2485 unsigned long t;
e1091b15 2486 int ret;
3197ebdb 2487
e1091b15
LC		 2488 ret = kstrtoul(skip_spaces(buf), 0, &t);
2489 if (ret)
2490 return ret;
3197ebdb
TT		 2491 *ui = t;
2492 return count;
2493}
2494
27dd4385
LC		 2495static ssize_t reserved_clusters_show(struct ext4_attr *a,
2496 struct ext4_sb_info *sbi, char *buf)
2497{
2498 return snprintf(buf, PAGE_SIZE, "%llu\n",
2499 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2500}
2501
2502static ssize_t reserved_clusters_store(struct ext4_attr *a,
2503 struct ext4_sb_info *sbi,
2504 const char *buf, size_t count)
2505{
2506 unsigned long long val;
2507 int ret;
2508
2509 if (parse_strtoull(buf, -1ULL, &val))
2510 return -EINVAL;
2511 ret = ext4_reserve_clusters(sbi, val);
2512
2513 return ret ? ret : count;
2514}
2515
2c0544b2
TT		 2516static ssize_t trigger_test_error(struct ext4_attr *a,
2517 struct ext4_sb_info *sbi,
2518 const char *buf, size_t count)
2519{
2520 int len = count;
2521
2522 if (!capable(CAP_SYS_ADMIN))
2523 return -EPERM;
2524
2525 if (len && buf[len-1] == '\n')
2526 len--;
2527
2528 if (len)
2529 ext4_error(sbi->s_sb, "%.*s", len, buf);
2530 return count;
2531}
2532
3197ebdb
TT		 2533#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2534static struct ext4_attr ext4_attr_##_name = { \
2535 .attr = {.name = __stringify(_name), .mode = _mode }, \
2536 .show = _show, \
2537 .store = _store, \
2538 .offset = offsetof(struct ext4_sb_info, _elname), \
2539}
2540#define EXT4_ATTR(name, mode, show, store) \
2541static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2542
857ac889 2543#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2544#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2545#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2546#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2547 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2548#define ATTR_LIST(name) &ext4_attr_##name.attr
2549
2550EXT4_RO_ATTR(delayed_allocation_blocks);
2551EXT4_RO_ATTR(session_write_kbytes);
2552EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2553EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2554EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2555 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2556EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2557EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2558EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2559EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2560EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2561EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2562EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2563EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
67a5da56 2564EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2565EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2566
2567static struct attribute *ext4_attrs[] = {
2568 ATTR_LIST(delayed_allocation_blocks),
2569 ATTR_LIST(session_write_kbytes),
2570 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2571 ATTR_LIST(reserved_clusters),
3197ebdb 2572 ATTR_LIST(inode_readahead_blks),
11013911 2573 ATTR_LIST(inode_goal),
3197ebdb
TT		 2574 ATTR_LIST(mb_stats),
2575 ATTR_LIST(mb_max_to_scan),
2576 ATTR_LIST(mb_min_to_scan),
2577 ATTR_LIST(mb_order2_req),
2578 ATTR_LIST(mb_stream_req),
2579 ATTR_LIST(mb_group_prealloc),
55138e0b 2580 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2581 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2582 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2583 NULL,
2584};
2585
857ac889
LC		 2586/* Features this copy of ext4 supports */
2587EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2588EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2589EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2590
2591static struct attribute *ext4_feat_attrs[] = {
2592 ATTR_LIST(lazy_itable_init),
27ee40df 2593 ATTR_LIST(batched_discard),
5e7bbef1 2594 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2595 NULL,
2596};
2597
3197ebdb
TT		 2598static ssize_t ext4_attr_show(struct kobject *kobj,
2599 struct attribute *attr, char *buf)
2600{
2601 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2602 s_kobj);
2603 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2604
2605 return a->show ? a->show(a, sbi, buf) : 0;
2606}
2607
2608static ssize_t ext4_attr_store(struct kobject *kobj,
2609 struct attribute *attr,
2610 const char *buf, size_t len)
2611{
2612 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2613 s_kobj);
2614 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2615
2616 return a->store ? a->store(a, sbi, buf, len) : 0;
2617}
2618
2619static void ext4_sb_release(struct kobject *kobj)
2620{
2621 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2622 s_kobj);
2623 complete(&sbi->s_kobj_unregister);
2624}
2625
52cf25d0 2626static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2627 .show = ext4_attr_show,
2628 .store = ext4_attr_store,
2629};
2630
2631static struct kobj_type ext4_ktype = {
2632 .default_attrs = ext4_attrs,
2633 .sysfs_ops = &ext4_attr_ops,
2634 .release = ext4_sb_release,
2635};
2636
857ac889
LC		 2637static void ext4_feat_release(struct kobject *kobj)
2638{
2639 complete(&ext4_feat->f_kobj_unregister);
2640}
2641
2642static struct kobj_type ext4_feat_ktype = {
2643 .default_attrs = ext4_feat_attrs,
2644 .sysfs_ops = &ext4_attr_ops,
2645 .release = ext4_feat_release,
2646};
2647
a13fb1a4
ES		 2648/*
2649 * Check whether this filesystem can be mounted based on
2650 * the features present and the RDONLY/RDWR mount requested.
2651 * Returns 1 if this filesystem can be mounted as requested,
2652 * 0 if it cannot be.
2653 */
2654static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2655{
2656 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2657 ext4_msg(sb, KERN_ERR,
2658 "Couldn't mount because of "
2659 "unsupported optional features (%x)",
2660 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2661 ~EXT4_FEATURE_INCOMPAT_SUPP));
2662 return 0;
2663 }
2664
2665 if (readonly)
2666 return 1;
2667
2668 /* Check that feature set is OK for a read-write mount */
2669 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2670 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2671 "unsupported optional features (%x)",
2672 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2673 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2674 return 0;
2675 }
2676 /*
2677 * Large file size enabled file system can only be mounted
2678 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2679 */
2680 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2681 if (sizeof(blkcnt_t) < sizeof(u64)) {
2682 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2683 "cannot be mounted RDWR without "
2684 "CONFIG_LBDAF");
2685 return 0;
2686 }
2687 }
bab08ab9
TT		 2688 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2689 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2690 ext4_msg(sb, KERN_ERR,
2691 "Can't support bigalloc feature without "
2692 "extents feature\n");
2693 return 0;
2694 }
7c319d32
AK		 2695
2696#ifndef CONFIG_QUOTA
2697 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2698 !readonly) {
2699 ext4_msg(sb, KERN_ERR,
2700 "Filesystem with quota feature cannot be mounted RDWR "
2701 "without CONFIG_QUOTA");
2702 return 0;
2703 }
2704#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2705 return 1;
2706}
2707
66e61a9e
TT		 2708/*
2709 * This function is called once a day if we have errors logged
2710 * on the file system
2711 */
2712static void print_daily_error_info(unsigned long arg)
2713{
2714 struct super_block *sb = (struct super_block *) arg;
2715 struct ext4_sb_info *sbi;
2716 struct ext4_super_block *es;
2717
2718 sbi = EXT4_SB(sb);
2719 es = sbi->s_es;
2720
2721 if (es->s_error_count)
9625fe1e
TT		 2722 /* fsck newer than v1.41.13 is needed to clean this condition. */
2723 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2724 le32_to_cpu(es->s_error_count));
2725 if (es->s_first_error_time) {
9625fe1e 2726 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2727 sb->s_id, le32_to_cpu(es->s_first_error_time),
2728 (int) sizeof(es->s_first_error_func),
2729 es->s_first_error_func,
2730 le32_to_cpu(es->s_first_error_line));
2731 if (es->s_first_error_ino)
2732 printk(": inode %u",
2733 le32_to_cpu(es->s_first_error_ino));
2734 if (es->s_first_error_block)
2735 printk(": block %llu", (unsigned long long)
2736 le64_to_cpu(es->s_first_error_block));
2737 printk("\n");
2738 }
2739 if (es->s_last_error_time) {
9625fe1e 2740 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2741 sb->s_id, le32_to_cpu(es->s_last_error_time),
2742 (int) sizeof(es->s_last_error_func),
2743 es->s_last_error_func,
2744 le32_to_cpu(es->s_last_error_line));
2745 if (es->s_last_error_ino)
2746 printk(": inode %u",
2747 le32_to_cpu(es->s_last_error_ino));
2748 if (es->s_last_error_block)
2749 printk(": block %llu", (unsigned long long)
2750 le64_to_cpu(es->s_last_error_block));
2751 printk("\n");
2752 }
2753 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2754}
2755
bfff6873
LC		 2756/* Find next suitable group and run ext4_init_inode_table */
2757static int ext4_run_li_request(struct ext4_li_request *elr)
2758{
2759 struct ext4_group_desc *gdp = NULL;
2760 ext4_group_t group, ngroups;
2761 struct super_block *sb;
2762 unsigned long timeout = 0;
2763 int ret = 0;
2764
2765 sb = elr->lr_super;
2766 ngroups = EXT4_SB(sb)->s_groups_count;
2767
8e8ad8a5 2768 sb_start_write(sb);
bfff6873
LC		 2769 for (group = elr->lr_next_group; group < ngroups; group++) {
2770 gdp = ext4_get_group_desc(sb, group, NULL);
2771 if (!gdp) {
2772 ret = 1;
2773 break;
2774 }
2775
2776 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2777 break;
2778 }
2779
7f511862 2780 if (group >= ngroups)
bfff6873
LC		 2781 ret = 1;
2782
2783 if (!ret) {
2784 timeout = jiffies;
2785 ret = ext4_init_inode_table(sb, group,
2786 elr->lr_timeout ? 0 : 1);
2787 if (elr->lr_timeout == 0) {
51ce6511
LC		 2788 timeout = (jiffies - timeout) *
2789 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2790 elr->lr_timeout = timeout;
2791 }
2792 elr->lr_next_sched = jiffies + elr->lr_timeout;
2793 elr->lr_next_group = group + 1;
2794 }
8e8ad8a5 2795 sb_end_write(sb);
bfff6873
LC		 2796
2797 return ret;
2798}
2799
2800/*
2801 * Remove lr_request from the list_request and free the
4ed5c033 2802 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2803 */
2804static void ext4_remove_li_request(struct ext4_li_request *elr)
2805{
2806 struct ext4_sb_info *sbi;
2807
2808 if (!elr)
2809 return;
2810
2811 sbi = elr->lr_sbi;
2812
2813 list_del(&elr->lr_request);
2814 sbi->s_li_request = NULL;
2815 kfree(elr);
2816}
2817
2818static void ext4_unregister_li_request(struct super_block *sb)
2819{
1bb933fb
LC		 2820 mutex_lock(&ext4_li_mtx);
2821 if (!ext4_li_info) {
2822 mutex_unlock(&ext4_li_mtx);
bfff6873 2823 return;
1bb933fb 2824 }
bfff6873
LC		 2825
2826 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2827 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2828 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2829 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2830}
2831
8f1f7453
ES		 2832static struct task_struct *ext4_lazyinit_task;
2833
bfff6873
LC		 2834/*
2835 * This is the function where ext4lazyinit thread lives. It walks
2836 * through the request list searching for next scheduled filesystem.
2837 * When such a fs is found, run the lazy initialization request
2838 * (ext4_rn_li_request) and keep track of the time spend in this
2839 * function. Based on that time we compute next schedule time of
2840 * the request. When walking through the list is complete, compute
2841 * next waking time and put itself into sleep.
2842 */
2843static int ext4_lazyinit_thread(void *arg)
2844{
2845 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2846 struct list_head *pos, *n;
2847 struct ext4_li_request *elr;
4ed5c033 2848 unsigned long next_wakeup, cur;
bfff6873
LC		 2849
2850 BUG_ON(NULL == eli);
6fa3eb70 2851 set_freezable();
bfff6873 2852
bfff6873
LC		 2853cont_thread:
2854 while (true) {
2855 next_wakeup = MAX_JIFFY_OFFSET;
2856
2857 mutex_lock(&eli->li_list_mtx);
2858 if (list_empty(&eli->li_request_list)) {
2859 mutex_unlock(&eli->li_list_mtx);
2860 goto exit_thread;
2861 }
2862
2863 list_for_each_safe(pos, n, &eli->li_request_list) {
2864 elr = list_entry(pos, struct ext4_li_request,
2865 lr_request);
2866
b2c78cd0
TT		 2867 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2868 if (ext4_run_li_request(elr) != 0) {
2869 /* error, remove the lazy_init job */
2870 ext4_remove_li_request(elr);
2871 continue;
2872 }
bfff6873
LC		 2873 }
2874
2875 if (time_before(elr->lr_next_sched, next_wakeup))
2876 next_wakeup = elr->lr_next_sched;
2877 }
2878 mutex_unlock(&eli->li_list_mtx);
2879
a0acae0e 2880 try_to_freeze();
bfff6873 2881
4ed5c033
LC		 2882 cur = jiffies;
2883 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2884 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2885 cond_resched();
2886 continue;
2887 }
2888
4ed5c033
LC		 2889 schedule_timeout_interruptible(next_wakeup - cur);
2890
6fa3eb70 2891 if (kthread_freezable_should_stop(NULL)) {
8f1f7453
ES		 2892 ext4_clear_request_list();
2893 goto exit_thread;
2894 }
bfff6873
LC		 2895 }
2896
2897exit_thread:
2898 /*
2899 * It looks like the request list is empty, but we need
2900 * to check it under the li_list_mtx lock, to prevent any
2901 * additions into it, and of course we should lock ext4_li_mtx
2902 * to atomically free the list and ext4_li_info, because at
2903 * this point another ext4 filesystem could be registering
2904 * new one.
2905 */
2906 mutex_lock(&ext4_li_mtx);
2907 mutex_lock(&eli->li_list_mtx);
2908 if (!list_empty(&eli->li_request_list)) {
2909 mutex_unlock(&eli->li_list_mtx);
2910 mutex_unlock(&ext4_li_mtx);
2911 goto cont_thread;
2912 }
2913 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2914 kfree(ext4_li_info);
2915 ext4_li_info = NULL;
2916 mutex_unlock(&ext4_li_mtx);
2917
2918 return 0;
2919}
2920
2921static void ext4_clear_request_list(void)
2922{
2923 struct list_head *pos, *n;
2924 struct ext4_li_request *elr;
2925
2926 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2927 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2928 elr = list_entry(pos, struct ext4_li_request,
2929 lr_request);
2930 ext4_remove_li_request(elr);
2931 }
2932 mutex_unlock(&ext4_li_info->li_list_mtx);
2933}
2934
2935static int ext4_run_lazyinit_thread(void)
2936{
8f1f7453
ES		 2937 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2938 ext4_li_info, "ext4lazyinit");
2939 if (IS_ERR(ext4_lazyinit_task)) {
2940 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2941 ext4_clear_request_list();
bfff6873
LC		 2942 kfree(ext4_li_info);
2943 ext4_li_info = NULL;
92b97816 2944 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2945 "initialization thread\n",
2946 err);
2947 return err;
2948 }
2949 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2950 return 0;
2951}
2952
2953/*
2954 * Check whether it make sense to run itable init. thread or not.
2955 * If there is at least one uninitialized inode table, return
2956 * corresponding group number, else the loop goes through all
2957 * groups and return total number of groups.
2958 */
2959static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2960{
2961 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2962 struct ext4_group_desc *gdp = NULL;
2963
2964 for (group = 0; group < ngroups; group++) {
2965 gdp = ext4_get_group_desc(sb, group, NULL);
2966 if (!gdp)
2967 continue;
2968
2969 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2970 break;
2971 }
2972
2973 return group;
2974}
2975
2976static int ext4_li_info_new(void)
2977{
2978 struct ext4_lazy_init *eli = NULL;
2979
2980 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2981 if (!eli)
2982 return -ENOMEM;
2983
bfff6873
LC		 2984 INIT_LIST_HEAD(&eli->li_request_list);
2985 mutex_init(&eli->li_list_mtx);
2986
bfff6873
LC		 2987 eli->li_state |= EXT4_LAZYINIT_QUIT;
2988
2989 ext4_li_info = eli;
2990
2991 return 0;
2992}
2993
2994static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2995 ext4_group_t start)
2996{
2997 struct ext4_sb_info *sbi = EXT4_SB(sb);
2998 struct ext4_li_request *elr;
2999 unsigned long rnd;
3000
3001 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3002 if (!elr)
3003 return NULL;
3004
3005 elr->lr_super = sb;
3006 elr->lr_sbi = sbi;
3007 elr->lr_next_group = start;
3008
3009 /*
3010 * Randomize first schedule time of the request to
3011 * spread the inode table initialization requests
3012 * better.
3013 */
3014 get_random_bytes(&rnd, sizeof(rnd));
3015 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3016 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3017
3018 return elr;
3019}
3020
7f511862
TT		 3021int ext4_register_li_request(struct super_block *sb,
3022 ext4_group_t first_not_zeroed)
bfff6873
LC		 3023{
3024 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3025 struct ext4_li_request *elr = NULL;
bfff6873 3026 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3027 int ret = 0;
bfff6873 3028
7f511862 3029 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3030 if (sbi->s_li_request != NULL) {
3031 /*
3032 * Reset timeout so it can be computed again, because
3033 * s_li_wait_mult might have changed.
3034 */
3035 sbi->s_li_request->lr_timeout = 0;
7f511862 3036 goto out;
51ce6511 3037 }
bfff6873
LC		 3038
3039 if (first_not_zeroed == ngroups ||
3040 (sb->s_flags & MS_RDONLY) ||
55ff3840 3041 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3042 goto out;
bfff6873
LC		 3043
3044 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3045 if (!elr) {
3046 ret = -ENOMEM;
3047 goto out;
3048 }
bfff6873
LC		 3049
3050 if (NULL == ext4_li_info) {
3051 ret = ext4_li_info_new();
3052 if (ret)
3053 goto out;
3054 }
3055
3056 mutex_lock(&ext4_li_info->li_list_mtx);
3057 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3058 mutex_unlock(&ext4_li_info->li_list_mtx);
3059
3060 sbi->s_li_request = elr;
46e4690b
TM		 3061 /*
3062 * set elr to NULL here since it has been inserted to
3063 * the request_list and the removal and free of it is
3064 * handled by ext4_clear_request_list from now on.
3065 */
3066 elr = NULL;
bfff6873
LC		 3067
3068 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3069 ret = ext4_run_lazyinit_thread();
3070 if (ret)
3071 goto out;
3072 }
bfff6873 3073out:
beed5ecb
NK		 3074 mutex_unlock(&ext4_li_mtx);
3075 if (ret)
bfff6873 3076 kfree(elr);
bfff6873
LC		 3077 return ret;
3078}
3079
3080/*
3081 * We do not need to lock anything since this is called on
3082 * module unload.
3083 */
3084static void ext4_destroy_lazyinit_thread(void)
3085{
3086 /*
3087 * If thread exited earlier
3088 * there's nothing to be done.
3089 */
8f1f7453 3090 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3091 return;
3092
8f1f7453 3093 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3094}
3095
25ed6e8a
DW		 3096static int set_journal_csum_feature_set(struct super_block *sb)
3097{
3098 int ret = 1;
3099 int compat, incompat;
3100 struct ext4_sb_info *sbi = EXT4_SB(sb);
3101
3102 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3103 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3104 /* journal checksum v2 */
3105 compat = 0;
3106 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3107 } else {
3108 /* journal checksum v1 */
3109 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3110 incompat = 0;
3111 }
3112
3113 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3114 ret = jbd2_journal_set_features(sbi->s_journal,
3115 compat, 0,
3116 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3117 incompat);
3118 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3119 ret = jbd2_journal_set_features(sbi->s_journal,
3120 compat, 0,
3121 incompat);
3122 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3123 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3124 } else {
3125 jbd2_journal_clear_features(sbi->s_journal,
3126 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3127 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3128 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3129 }
3130
3131 return ret;
3132}
3133
952fc18e
TT		 3134/*
3135 * Note: calculating the overhead so we can be compatible with
3136 * historical BSD practice is quite difficult in the face of
3137 * clusters/bigalloc. This is because multiple metadata blocks from
3138 * different block group can end up in the same allocation cluster.
3139 * Calculating the exact overhead in the face of clustered allocation
3140 * requires either O(all block bitmaps) in memory or O(number of block
3141 * groups**2) in time. We will still calculate the superblock for
3142 * older file systems --- and if we come across with a bigalloc file
3143 * system with zero in s_overhead_clusters the estimate will be close to
3144 * correct especially for very large cluster sizes --- but for newer
3145 * file systems, it's better to calculate this figure once at mkfs
3146 * time, and store it in the superblock. If the superblock value is
3147 * present (even for non-bigalloc file systems), we will use it.
3148 */
3149static int count_overhead(struct super_block *sb, ext4_group_t grp,
3150 char *buf)
3151{
3152 struct ext4_sb_info *sbi = EXT4_SB(sb);
3153 struct ext4_group_desc *gdp;
3154 ext4_fsblk_t first_block, last_block, b;
3155 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3156 int s, j, count = 0;
3157
0548bbb8
TT		 3158 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3159 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3160 sbi->s_itb_per_group + 2);
3161
952fc18e
TT		 3162 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3163 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3164 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3165 for (i = 0; i < ngroups; i++) {
3166 gdp = ext4_get_group_desc(sb, i, NULL);
3167 b = ext4_block_bitmap(sb, gdp);
3168 if (b >= first_block && b <= last_block) {
3169 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3170 count++;
3171 }
3172 b = ext4_inode_bitmap(sb, gdp);
3173 if (b >= first_block && b <= last_block) {
3174 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3175 count++;
3176 }
3177 b = ext4_inode_table(sb, gdp);
3178 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3179 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3180 int c = EXT4_B2C(sbi, b - first_block);
3181 ext4_set_bit(c, buf);
3182 count++;
3183 }
3184 if (i != grp)
3185 continue;
3186 s = 0;
3187 if (ext4_bg_has_super(sb, grp)) {
3188 ext4_set_bit(s++, buf);
3189 count++;
3190 }
d61f4e22
TT		 3191 j = ext4_bg_num_gdb(sb, grp);
3192 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3193 ext4_error(sb, "Invalid number of block group "
3194 "descriptor blocks: %d", j);
3195 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3196 }
d61f4e22
TT		 3197 count += j;
3198 for (; j > 0; j--)
3199 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3200 }
3201 if (!count)
3202 return 0;
3203 return EXT4_CLUSTERS_PER_GROUP(sb) -
3204 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3205}
3206
3207/*
3208 * Compute the overhead and stash it in sbi->s_overhead
3209 */
3210int ext4_calculate_overhead(struct super_block *sb)
3211{
3212 struct ext4_sb_info *sbi = EXT4_SB(sb);
3213 struct ext4_super_block *es = sbi->s_es;
3214 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3215 ext4_fsblk_t overhead = 0;
3216 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3217
952fc18e
TT		 3218 if (!buf)
3219 return -ENOMEM;
3220
3221 /*
3222 * Compute the overhead (FS structures). This is constant
3223 * for a given filesystem unless the number of block groups
3224 * changes so we cache the previous value until it does.
3225 */
3226
3227 /*
3228 * All of the blocks before first_data_block are overhead
3229 */
3230 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3231
3232 /*
3233 * Add the overhead found in each block group
3234 */
3235 for (i = 0; i < ngroups; i++) {
3236 int blks;
3237
3238 blks = count_overhead(sb, i, buf);
3239 overhead += blks;
3240 if (blks)
3241 memset(buf, 0, PAGE_SIZE);
3242 cond_resched();
3243 }
0875a2b4
ES		 3244 /* Add the journal blocks as well */
3245 if (sbi->s_journal)
810da240 3246 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3247
952fc18e
TT		 3248 sbi->s_overhead = overhead;
3249 smp_wmb();
3250 free_page((unsigned long) buf);
3251 return 0;
3252}
3253
27dd4385 3254
b35e4430 3255static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3256{
3257 ext4_fsblk_t resv_clusters;
3258
b35e4430
JK		 3259 /*
3260 * There's no need to reserve anything when we aren't using extents.
3261 * The space estimates are exact, there are no unwritten extents,
3262 * hole punching doesn't need new metadata... This is needed especially
3263 * to keep ext2/3 backward compatibility.
3264 */
3265 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3266 return 0;
27dd4385
LC		 3267 /*
3268 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3269 * This should cover the situations where we can not afford to run
3270 * out of space like for example punch hole, or converting
3271 * uninitialized extents in delalloc path. In most cases such
3272 * allocation would require 1, or 2 blocks, higher numbers are
3273 * very rare.
3274 */
b35e4430
JK		 3275 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3276 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3277
3278 do_div(resv_clusters, 50);
3279 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3280
3281 return resv_clusters;
3282}
3283
3284
3285static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3286{
3287 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3288 sbi->s_cluster_bits;
3289
3290 if (count >= clusters)
3291 return -EINVAL;
3292
3293 atomic64_set(&sbi->s_resv_clusters, count);
3294 return 0;
3295}
3296
2b2d6d01 3297static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3298{
d4c402d9 3299 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3300 struct buffer_head *bh;
617ba13b 3301 struct ext4_super_block *es = NULL;
bd652ad1 3302 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3303 ext4_fsblk_t block;
3304 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3305 ext4_fsblk_t logical_sb_block;
ac27a0ec 3306 unsigned long offset = 0;
ac27a0ec
DK		 3307 unsigned long journal_devnum = 0;
3308 unsigned long def_mount_opts;
3309 struct inode *root;
9f6200bb 3310 char *cp;
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 3321
bd652ad1
TT		 3322 if ((data && !orig_data) || !sbi)
3323 goto out_free_base;
705895b6
PE		 3324
3325 sbi->s_blockgroup_lock =
3326 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
bd652ad1
TT		 3327 if (!sbi->s_blockgroup_lock)
3328 goto out_free_base;
3329
ac27a0ec 3330 sb->s_fs_info = sbi;
2c0544b2 3331 sbi->s_sb = sb;
240799cd 3332 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3333 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3334 if (sb->s_bdev->bd_part)
3335 sbi->s_sectors_written_start =
3336 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3337
9f6200bb
TT		 3338 /* Cleanup superblock name */
3339 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3340 *cp = '!';
3341
07aa2ea1 3342 /* -EINVAL is default */
dcc7dae3 3343 ret = -EINVAL;
617ba13b 3344 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3345 if (!blocksize) {
b31e1552 3346 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3347 goto out_fail;
3348 }
3349
3350 /*
617ba13b 3351 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3352 * block sizes. We need to calculate the offset from buffer start.
3353 */
617ba13b 3354 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3355 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3356 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3357 } else {
70bbb3e0 3358 logical_sb_block = sb_block;
ac27a0ec
DK		 3359 }
3360
70bbb3e0 3361 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3362 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3363 goto out_fail;
3364 }
3365 /*
3366 * Note: s_es must be initialized as soon as possible because
617ba13b 3367 * some ext4 macro-instructions depend on its value
ac27a0ec 3368 */
2716b802 3369 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3370 sbi->s_es = es;
3371 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3372 if (sb->s_magic != EXT4_SUPER_MAGIC)
3373 goto cantfind_ext4;
afc32f7e 3374 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3375
feb0ab32
DW		 3376 /* Warn if metadata_csum and gdt_csum are both set. */
3377 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3378 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3379 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3380 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
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
DW		 3391 /* Load the checksum driver */
3392 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3393 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3394 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3395 if (IS_ERR(sbi->s_chksum_driver)) {
3396 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3397 ret = PTR_ERR(sbi->s_chksum_driver);
3398 sbi->s_chksum_driver = NULL;
3399 goto failed_mount;
3400 }
3401 }
3402
a9c47317
DW		 3403 /* Check superblock checksum */
3404 if (!ext4_superblock_csum_verify(sb, es)) {
3405 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3406 "invalid superblock checksum. Run e2fsck?");
3407 silent = 1;
3408 goto cantfind_ext4;
3409 }
3410
3411 /* Precompute checksum seed for all metadata */
3412 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3413 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3414 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3415 sizeof(es->s_uuid));
3416
ac27a0ec
DK		 3417 /* Set defaults before we parse the mount options */
3418 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3419 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3420 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3421 set_opt(sb, DEBUG);
87f26807 3422 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3423 set_opt(sb, GRPID);
617ba13b 3424 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3425 set_opt(sb, NO_UID32);
ea663336 3426 /* xattr user namespace & acls are now defaulted on */
ea663336 3427 set_opt(sb, XATTR_USER);
03010a33 3428#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3429 set_opt(sb, POSIX_ACL);
2e7842b8 3430#endif
617ba13b 3431 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3432 set_opt(sb, JOURNAL_DATA);
617ba13b 3433 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3434 set_opt(sb, ORDERED_DATA);
617ba13b 3435 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3436 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3437
3438 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3439 set_opt(sb, ERRORS_PANIC);
bb4f397a 3440 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3441 set_opt(sb, ERRORS_CONT);
bb4f397a 3442 else
fd8c37ec 3443 set_opt(sb, ERRORS_RO);
8b67f04a 3444 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3445 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3446 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3447 set_opt(sb, DISCARD);
ac27a0ec 3448
08cefc7a
EB		 3449 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3450 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3451 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3452 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3453 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3454
8b67f04a 3455 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3456 set_opt(sb, BARRIER);
ac27a0ec 3457
dd919b98
AK		 3458 /*
3459 * enable delayed allocation by default
3460 * Use -o nodelalloc to turn it off
3461 */
bc0b75f7 3462 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3463 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3464 set_opt(sb, DELALLOC);
dd919b98 3465
51ce6511
LC		 3466 /*
3467 * set default s_li_wait_mult for lazyinit, for the case there is
3468 * no mount option specified.
3469 */
3470 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3471
bd652ad1
TT		 3472 if (sbi->s_es->s_mount_opts[0]) {
3473 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3474 sizeof(sbi->s_es->s_mount_opts),
3475 GFP_KERNEL);
3476 if (!s_mount_opts)
3477 goto failed_mount;
3478 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3479 &journal_ioprio, 0)) {
3480 ext4_msg(sb, KERN_WARNING,
3481 "failed to parse options in superblock: %s",
3482 s_mount_opts);
3483 }
3484 kfree(s_mount_opts);
8b67f04a 3485 }
5a916be1 3486 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3487 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3488 &journal_ioprio, 0))
ac27a0ec
DK		 3489 goto failed_mount;
3490
56889787
TT		 3491 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3492 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3493 "with data=journal disables delayed "
3494 "allocation and O_DIRECT support!\n");
3495 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3496 ext4_msg(sb, KERN_ERR, "can't mount with "
3497 "both data=journal and delalloc");
3498 goto failed_mount;
3499 }
3500 if (test_opt(sb, DIOREAD_NOLOCK)) {
3501 ext4_msg(sb, KERN_ERR, "can't mount with "
c4fa1009 3502 "both data=journal and dioread_nolock");
56889787
TT		 3503 goto failed_mount;
3504 }
3505 if (test_opt(sb, DELALLOC))
3506 clear_opt(sb, DELALLOC);
3507 }
3508
ac27a0ec 3509 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3510 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3511
617ba13b
MC		 3512 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3513 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3514 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3515 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3516 ext4_msg(sb, KERN_WARNING,
3517 "feature flags set on rev 0 fs, "
3518 "running e2fsck is recommended");
469108ff 3519
2035e776
TT		 3520 if (IS_EXT2_SB(sb)) {
3521 if (ext2_feature_set_ok(sb))
3522 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3523 "using the ext4 subsystem");
3524 else {
3525 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3526 "to feature incompatibilities");
3527 goto failed_mount;
3528 }
3529 }
3530
3531 if (IS_EXT3_SB(sb)) {
3532 if (ext3_feature_set_ok(sb))
3533 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3534 "using the ext4 subsystem");
3535 else {
3536 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3537 "to feature incompatibilities");
3538 goto failed_mount;
3539 }
3540 }
3541
ac27a0ec
DK		 3542 /*
3543 * Check feature flags regardless of the revision level, since we
3544 * previously didn't change the revision level when setting the flags,
3545 * so there is a chance incompat flags are set on a rev 0 filesystem.
3546 */
a13fb1a4 3547 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3548 goto failed_mount;
a13fb1a4 3549
261cb20c 3550 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3551 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3552 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3553 ext4_msg(sb, KERN_ERR,
a7ee70f6
TT		 3554 "Unsupported filesystem blocksize %d (%d log_block_size)",
3555 blocksize, le32_to_cpu(es->s_log_block_size));
3556 goto failed_mount;
3557 }
3558 if (le32_to_cpu(es->s_log_block_size) >
3559 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3560 ext4_msg(sb, KERN_ERR,
3561 "Invalid log block size: %u",
3562 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3563 goto failed_mount;
3564 }
3565
ac27a0ec 3566 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3567 /* Validate the filesystem blocksize */
3568 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3569 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3570 blocksize);
ac27a0ec
DK		 3571 goto failed_mount;
3572 }
3573
2b2d6d01 3574 brelse(bh);
70bbb3e0
AM		 3575 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3576 offset = do_div(logical_sb_block, blocksize);
3577 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3578 if (!bh) {
b31e1552
ES		 3579 ext4_msg(sb, KERN_ERR,
3580 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3581 goto failed_mount;
3582 }
2716b802 3583 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3584 sbi->s_es = es;
617ba13b 3585 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3586 ext4_msg(sb, KERN_ERR,
3587 "Magic mismatch, very weird!");
ac27a0ec
DK		 3588 goto failed_mount;
3589 }
3590 }
3591
a13fb1a4
ES		 3592 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3593 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3594 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3595 has_huge_files);
3596 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3597
617ba13b
MC		 3598 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3599 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3600 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3601 } else {
3602 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3603 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3604 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3605 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3606 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3607 ext4_msg(sb, KERN_ERR,
3608 "unsupported inode size: %d",
2b2d6d01 3609 sbi->s_inode_size);
ac27a0ec
DK		 3610 goto failed_mount;
3611 }
ef7f3835
KS		 3612 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3613 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3614 }
0b8e58a1 3615
0d1ee42f
AR		 3616 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3617 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3618 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3619 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3620 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3621 ext4_msg(sb, KERN_ERR,
3622 "unsupported descriptor size %lu",
0d1ee42f
AR		 3623 sbi->s_desc_size);
3624 goto failed_mount;
3625 }
3626 } else
3627 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3628
ac27a0ec 3629 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3630 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3631
617ba13b 3632 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3633 if (sbi->s_inodes_per_block == 0)
617ba13b 3634 goto cantfind_ext4;
408d8245
TT		 3635 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3636 sbi->s_inodes_per_group > blocksize * 8) {
3637 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3638 sbi->s_blocks_per_group);
3639 goto failed_mount;
3640 }
ac27a0ec
DK		 3641 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3642 sbi->s_inodes_per_block;
0d1ee42f 3643 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3644 sbi->s_sbh = bh;
3645 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3646 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3647 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3648
2b2d6d01 3649 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3650 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3651 sbi->s_def_hash_version = es->s_def_hash_version;
f13ea132
TT		 3652 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3653 i = le32_to_cpu(es->s_flags);
3654 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3655 sbi->s_hash_unsigned = 3;
3656 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3657#ifdef __CHAR_UNSIGNED__
f13ea132
TT		 3658 if (!(sb->s_flags & MS_RDONLY))
3659 es->s_flags |=
3660 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3661 sbi->s_hash_unsigned = 3;
f99b2589 3662#else
f13ea132
TT		 3663 if (!(sb->s_flags & MS_RDONLY))
3664 es->s_flags |=
3665 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3666#endif
f13ea132 3667 }
f99b2589 3668 }
ac27a0ec 3669
281b5995
TT		 3670 /* Handle clustersize */
3671 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3672 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3673 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3674 if (has_bigalloc) {
3675 if (clustersize < blocksize) {
3676 ext4_msg(sb, KERN_ERR,
3677 "cluster size (%d) smaller than "
3678 "block size (%d)", clustersize, blocksize);
3679 goto failed_mount;
3680 }
a7ee70f6
TT		 3681 if (le32_to_cpu(es->s_log_cluster_size) >
3682 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3683 ext4_msg(sb, KERN_ERR,
3684 "Invalid log cluster size: %u",
3685 le32_to_cpu(es->s_log_cluster_size));
3686 goto failed_mount;
3687 }
281b5995
TT		 3688 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3689 le32_to_cpu(es->s_log_block_size);
3690 sbi->s_clusters_per_group =
3691 le32_to_cpu(es->s_clusters_per_group);
3692 if (sbi->s_clusters_per_group > blocksize * 8) {
3693 ext4_msg(sb, KERN_ERR,
3694 "#clusters per group too big: %lu",
3695 sbi->s_clusters_per_group);
3696 goto failed_mount;
3697 }
3698 if (sbi->s_blocks_per_group !=
3699 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3700 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3701 "clusters per group (%lu) inconsistent",
3702 sbi->s_blocks_per_group,
3703 sbi->s_clusters_per_group);
3704 goto failed_mount;
3705 }
3706 } else {
3707 if (clustersize != blocksize) {
3708 ext4_warning(sb, "fragment/cluster size (%d) != "
3709 "block size (%d)", clustersize,
3710 blocksize);
3711 clustersize = blocksize;
3712 }
3713 if (sbi->s_blocks_per_group > blocksize * 8) {
3714 ext4_msg(sb, KERN_ERR,
3715 "#blocks per group too big: %lu",
3716 sbi->s_blocks_per_group);
3717 goto failed_mount;
3718 }
3719 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3720 sbi->s_cluster_bits = 0;
ac27a0ec 3721 }
281b5995
TT		 3722 sbi->s_cluster_ratio = clustersize / blocksize;
3723
d8609256
TT		 3724 /* Do we have standard group size of clustersize * 8 blocks ? */
3725 if (sbi->s_blocks_per_group == clustersize << 3)
3726 set_opt2(sb, STD_GROUP_SIZE);
3727
bf43d84b
ES		 3728 /*
3729 * Test whether we have more sectors than will fit in sector_t,
3730 * and whether the max offset is addressable by the page cache.
3731 */
5a9ae68a 3732 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3733 ext4_blocks_count(es));
5a9ae68a 3734 if (err) {
b31e1552 3735 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3736 " too large to mount safely on this system");
ac27a0ec 3737 if (sizeof(sector_t) < 8)
90c699a9 3738 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3739 goto failed_mount;
3740 }
3741
617ba13b
MC		 3742 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3743 goto cantfind_ext4;
e7c95593 3744
0f2ddca6
FTN		 3745 /* check blocks count against device size */
3746 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3747 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3748 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3749 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3750 ext4_blocks_count(es), blocks_count);
3751 goto failed_mount;
3752 }
3753
0b8e58a1
AD		 3754 /*
3755 * It makes no sense for the first data block to be beyond the end
3756 * of the filesystem.
3757 */
3758 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3759 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3760 "block %u is beyond end of filesystem (%llu)",
3761 le32_to_cpu(es->s_first_data_block),
3762 ext4_blocks_count(es));
e7c95593
ES		 3763 goto failed_mount;
3764 }
bd81d8ee
LV		 3765 blocks_count = (ext4_blocks_count(es) -
3766 le32_to_cpu(es->s_first_data_block) +
3767 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3768 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3769 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3770 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3771 "(block count %llu, first data block %u, "
b31e1552 3772 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3773 ext4_blocks_count(es),
3774 le32_to_cpu(es->s_first_data_block),
3775 EXT4_BLOCKS_PER_GROUP(sb));
3776 goto failed_mount;
3777 }
bd81d8ee 3778 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3779 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3780 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3781 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3782 EXT4_DESC_PER_BLOCK(sb);
188b2ebb 3783 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG)) {
77bd57e6 3784 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
188b2ebb
EG		 3785 ext4_msg(sb, KERN_WARNING,
3786 "first meta block group too large: %u "
3787 "(group descriptor block count %u)",
3788 le32_to_cpu(es->s_first_meta_bg), db_count);
3789 goto failed_mount;
3790 }
3791 }
f18a5f21
TT		 3792 sbi->s_group_desc = ext4_kvmalloc(db_count *
3793 sizeof(struct buffer_head *),
3794 GFP_KERNEL);
ac27a0ec 3795 if (sbi->s_group_desc == NULL) {
b31e1552 3796 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3797 ret = -ENOMEM;
ac27a0ec
DK		 3798 goto failed_mount;
3799 }
3800
9f6200bb
TT		 3801 if (ext4_proc_root)
3802 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3803
66acdcf4
TT		 3804 if (sbi->s_proc)
3805 proc_create_data("options", S_IRUGO, sbi->s_proc,
3806 &ext4_seq_options_fops, sb);
3807
705895b6 3808 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3809
3810 for (i = 0; i < db_count; i++) {
70bbb3e0 3811 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3812 sbi->s_group_desc[i] = sb_bread(sb, block);
3813 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3814 ext4_msg(sb, KERN_ERR,
3815 "can't read group descriptor %d", i);
ac27a0ec
DK		 3816 db_count = i;
3817 goto failed_mount2;
3818 }
3819 }
7d506613 3820 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 3821 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3822 goto failed_mount2;
3823 }
772cb7c8
JS		 3824 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3825 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3826 ext4_msg(sb, KERN_ERR,
3827 "unable to initialize "
3828 "flex_bg meta info!");
772cb7c8
JS		 3829 goto failed_mount2;
3830 }
3831
ac27a0ec
DK		 3832 sbi->s_gdb_count = db_count;
3833 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3834 spin_lock_init(&sbi->s_next_gen_lock);
3835
04496411
TM		 3836 init_timer(&sbi->s_err_report);
3837 sbi->s_err_report.function = print_daily_error_info;
3838 sbi->s_err_report.data = (unsigned long) sb;
3839
a75ae78f
DM		 3840 /* Register extent status tree shrinker */
3841 ext4_es_register_shrinker(sb);
3842
57042651 3843 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3844 ext4_count_free_clusters(sb));
ce7e010a
TT		 3845 if (!err) {
3846 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3847 ext4_count_free_inodes(sb));
3848 }
3849 if (!err) {
3850 err = percpu_counter_init(&sbi->s_dirs_counter,
3851 ext4_count_dirs(sb));
3852 }
3853 if (!err) {
57042651 3854 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a 3855 }
1ac6466f
TT		 3856 if (!err) {
3857 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3858 }
ce7e010a
TT		 3859 if (err) {
3860 ext4_msg(sb, KERN_ERR, "insufficient memory");
3861 goto failed_mount3;
3862 }
3863
c9de560d 3864 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3865 sbi->s_max_writeback_mb_bump = 128;
67a5da56 3866 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3867
ac27a0ec
DK		 3868 /*
3869 * set up enough so that it can read an inode
3870 */
9ca92389
TT		 3871 if (!test_opt(sb, NOLOAD) &&
3872 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3873 sb->s_op = &ext4_sops;
3874 else
3875 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3876 sb->s_export_op = &ext4_export_ops;
3877 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3878#ifdef CONFIG_QUOTA
617ba13b 3879 sb->dq_op = &ext4_quota_operations;
262b4662 3880 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3881 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3882 else
3883 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3884#endif
f2fa2ffc
AK		 3885 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3886
ac27a0ec 3887 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3888 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3889
3890 sb->s_root = NULL;
3891
3892 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3893 EXT4_HAS_INCOMPAT_FEATURE(sb,
3894 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3895
c5e06d10
JL		 3896 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3897 !(sb->s_flags & MS_RDONLY))
3898 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3899 goto failed_mount3;
3900
ac27a0ec
DK		 3901 /*
3902 * The first inode we look at is the journal inode. Don't try
3903 * root first: it may be modified in the journal!
3904 */
3905 if (!test_opt(sb, NOLOAD) &&
617ba13b 3906 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
48a5889b
TT		 3907 err = ext4_load_journal(sb, es, journal_devnum);
3908 if (err)
ac27a0ec 3909 goto failed_mount3;
0390131b
FM		 3910 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3911 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3912 ext4_msg(sb, KERN_ERR, "required journal recovery "
3913 "suppressed and not mounted read-only");
744692dc 3914 goto failed_mount_wq;
ac27a0ec 3915 } else {
fd8c37ec 3916 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3917 sbi->s_journal = NULL;
3918 needs_recovery = 0;
3919 goto no_journal;
ac27a0ec
DK		 3920 }
3921
f32aaf2d 3922 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3923 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3924 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3925 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3926 goto failed_mount_wq;
eb40a09c
JS		 3927 }
3928
25ed6e8a
DW		 3929 if (!set_journal_csum_feature_set(sb)) {
3930 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3931 "feature set");
3932 goto failed_mount_wq;
d4da6c9c 3933 }
818d276c 3934
ac27a0ec
DK		 3935 /* We have now updated the journal if required, so we can
3936 * validate the data journaling mode. */
3937 switch (test_opt(sb, DATA_FLAGS)) {
3938 case 0:
3939 /* No mode set, assume a default based on the journal
63f57933
AM		 3940 * capabilities: ORDERED_DATA if the journal can
3941 * cope, else JOURNAL_DATA
3942 */
dab291af
MC		 3943 if (jbd2_journal_check_available_features
3944 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3945 set_opt(sb, ORDERED_DATA);
ac27a0ec 3946 else
fd8c37ec 3947 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3948 break;
3949
617ba13b
MC		 3950 case EXT4_MOUNT_ORDERED_DATA:
3951 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3952 if (!jbd2_journal_check_available_features
3953 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3954 ext4_msg(sb, KERN_ERR, "Journal does not support "
3955 "requested data journaling mode");
744692dc 3956 goto failed_mount_wq;
ac27a0ec
DK		 3957 }
3958 default:
3959 break;
3960 }
b3881f74 3961 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3962
18aadd47
BJ		 3963 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3964
ce7e010a
TT		 3965 /*
3966 * The journal may have updated the bg summary counts, so we
3967 * need to update the global counters.
3968 */
57042651 3969 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3970 ext4_count_free_clusters(sb));
ce7e010a
TT		 3971 percpu_counter_set(&sbi->s_freeinodes_counter,
3972 ext4_count_free_inodes(sb));
3973 percpu_counter_set(&sbi->s_dirs_counter,
3974 ext4_count_dirs(sb));
57042651 3975 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3976
ce7e010a 3977no_journal:
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 */
3994 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3995 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3996 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3997 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
07aa2ea1 3998 ret = -ENOMEM;
4c0425ff
MC		 3999 goto failed_mount_wq;
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;
4033 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4034 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4035 if (sbi->s_want_extra_isize <
4036 le16_to_cpu(es->s_want_extra_isize))
4037 sbi->s_want_extra_isize =
4038 le16_to_cpu(es->s_want_extra_isize);
4039 if (sbi->s_want_extra_isize <
4040 le16_to_cpu(es->s_min_extra_isize))
4041 sbi->s_want_extra_isize =
4042 le16_to_cpu(es->s_min_extra_isize);
4043 }
4044 }
4045 /* Check if enough inode space is available */
4046 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4047 sbi->s_inode_size) {
4048 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4049 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4050 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4051 "available");
ef7f3835
KS		 4052 }
4053
b35e4430 4054 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4055 if (err) {
4056 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
b35e4430 4057 "reserved pool", ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4058 goto failed_mount4a;
4059 }
4060
6fd058f7
TT		 4061 err = ext4_setup_system_zone(sb);
4062 if (err) {
b31e1552 4063 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4064 "zone (%d)", err);
94bf608a 4065 goto failed_mount4a;
6fd058f7
TT		 4066 }
4067
c2774d84 4068 ext4_ext_init(sb);
9d99012f 4069 err = ext4_mb_init(sb);
c2774d84 4070 if (err) {
421f91d2 4071 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 4072 err);
dcf2d804 4073 goto failed_mount5;
c2774d84
AK		 4074 }
4075
bfff6873
LC		 4076 err = ext4_register_li_request(sb, first_not_zeroed);
4077 if (err)
dcf2d804 4078 goto failed_mount6;
bfff6873 4079
3197ebdb
TT		 4080 sbi->s_kobj.kset = ext4_kset;
4081 init_completion(&sbi->s_kobj_unregister);
4082 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4083 "%s", sb->s_id);
dcf2d804
TM		 4084 if (err)
4085 goto failed_mount7;
3197ebdb 4086
9b2ff357
JK		 4087#ifdef CONFIG_QUOTA
4088 /* Enable quota usage during mount. */
4089 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4090 !(sb->s_flags & MS_RDONLY)) {
4091 err = ext4_enable_quotas(sb);
4092 if (err)
4093 goto failed_mount8;
4094 }
4095#endif /* CONFIG_QUOTA */
4096
617ba13b
MC		 4097 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4098 ext4_orphan_cleanup(sb, es);
4099 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4100 if (needs_recovery) {
b31e1552 4101 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4102 ext4_mark_recovery_complete(sb, es);
4103 }
4104 if (EXT4_SB(sb)->s_journal) {
4105 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4106 descr = " journalled data mode";
4107 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4108 descr = " ordered data mode";
4109 else
4110 descr = " writeback data mode";
4111 } else
4112 descr = "out journal";
4113
79add3a3
LC		 4114 if (test_opt(sb, DISCARD)) {
4115 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4116 if (!blk_queue_discard(q))
4117 ext4_msg(sb, KERN_WARNING,
4118 "mounting with \"discard\" option, but "
4119 "the device does not support discard");
4120 }
4121
d4c402d9 4122 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
bd652ad1
TT		 4123 "Opts: %.*s%s%s", descr,
4124 (int) sizeof(sbi->s_es->s_mount_opts),
4125 sbi->s_es->s_mount_opts,
8b67f04a 4126 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4127
66e61a9e
TT		 4128 if (es->s_error_count)
4129 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4130
d4c402d9 4131 kfree(orig_data);
ac27a0ec
DK		 4132 return 0;
4133
617ba13b 4134cantfind_ext4:
ac27a0ec 4135 if (!silent)
b31e1552 4136 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4137 goto failed_mount;
4138
72ba7450
TT		 4139#ifdef CONFIG_QUOTA
4140failed_mount8:
4141 kobject_del(&sbi->s_kobj);
4142#endif
dcf2d804
TM		 4143failed_mount7:
4144 ext4_unregister_li_request(sb);
4145failed_mount6:
dcf2d804 4146 ext4_mb_release(sb);
94bf608a
AV		 4147failed_mount5:
4148 ext4_ext_release(sb);
dcf2d804 4149 ext4_release_system_zone(sb);
94bf608a
AV		 4150failed_mount4a:
4151 dput(sb->s_root);
32a9bb57 4152 sb->s_root = NULL;
94bf608a 4153failed_mount4:
b31e1552 4154 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4155 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4156failed_mount_wq:
0390131b
FM		 4157 if (sbi->s_journal) {
4158 jbd2_journal_destroy(sbi->s_journal);
4159 sbi->s_journal = NULL;
4160 }
ac27a0ec 4161failed_mount3:
a75ae78f 4162 ext4_es_unregister_shrinker(sb);
04496411 4163 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4164 if (sbi->s_flex_groups)
4165 ext4_kvfree(sbi->s_flex_groups);
57042651 4166 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4167 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4168 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4169 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 4170 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
c5e06d10
JL		 4171 if (sbi->s_mmp_tsk)
4172 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4173failed_mount2:
4174 for (i = 0; i < db_count; i++)
4175 brelse(sbi->s_group_desc[i]);
f18a5f21 4176 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4177failed_mount:
0441984a
DW		 4178 if (sbi->s_chksum_driver)
4179 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4180 if (sbi->s_proc) {
66acdcf4 4181 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4182 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4183 }
ac27a0ec
DK		 4184#ifdef CONFIG_QUOTA
4185 for (i = 0; i < MAXQUOTAS; i++)
4186 kfree(sbi->s_qf_names[i]);
4187#endif
617ba13b 4188 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4189 brelse(bh);
4190out_fail:
4191 sb->s_fs_info = NULL;
f6830165 4192 kfree(sbi->s_blockgroup_lock);
bd652ad1 4193out_free_base:
ac27a0ec 4194 kfree(sbi);
d4c402d9 4195 kfree(orig_data);
07aa2ea1 4196 return err ? err : ret;
ac27a0ec
DK		 4197}
4198
4199/*
4200 * Setup any per-fs journal parameters now. We'll do this both on
4201 * initial mount, once the journal has been initialised but before we've
4202 * done any recovery; and again on any subsequent remount.
4203 */
617ba13b 4204static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4205{
617ba13b 4206 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4207
30773840
TT		 4208 journal->j_commit_interval = sbi->s_commit_interval;
4209 journal->j_min_batch_time = sbi->s_min_batch_time;
4210 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4211
a931da6a 4212 write_lock(&journal->j_state_lock);
ac27a0ec 4213 if (test_opt(sb, BARRIER))
dab291af 4214 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4215 else
dab291af 4216 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4217 if (test_opt(sb, DATA_ERR_ABORT))
4218 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4219 else
4220 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4221 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4222}
4223
617ba13b 4224static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4225 unsigned int journal_inum)
4226{
4227 struct inode *journal_inode;
4228 journal_t *journal;
4229
0390131b
FM		 4230 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4231
ac27a0ec
DK		 4232 /* First, test for the existence of a valid inode on disk. Bad
4233 * things happen if we iget() an unused inode, as the subsequent
4234 * iput() will try to delete it. */
4235
1d1fe1ee
DH		 4236 journal_inode = ext4_iget(sb, journal_inum);
4237 if (IS_ERR(journal_inode)) {
b31e1552 4238 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4239 return NULL;
4240 }
4241 if (!journal_inode->i_nlink) {
4242 make_bad_inode(journal_inode);
4243 iput(journal_inode);
b31e1552 4244 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4245 return NULL;
4246 }
4247
e5f8eab8 4248 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4249 journal_inode, journal_inode->i_size);
1d1fe1ee 4250 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4251 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4252 iput(journal_inode);
4253 return NULL;
4254 }
4255
dab291af 4256 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4257 if (!journal) {
b31e1552 4258 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4259 iput(journal_inode);
4260 return NULL;
4261 }
4262 journal->j_private = sb;
617ba13b 4263 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4264 return journal;
4265}
4266
617ba13b 4267static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4268 dev_t j_dev)
4269{
2b2d6d01 4270 struct buffer_head *bh;
ac27a0ec 4271 journal_t *journal;
617ba13b
MC		 4272 ext4_fsblk_t start;
4273 ext4_fsblk_t len;
ac27a0ec 4274 int hblock, blocksize;
617ba13b 4275 ext4_fsblk_t sb_block;
ac27a0ec 4276 unsigned long offset;
2b2d6d01 4277 struct ext4_super_block *es;
ac27a0ec
DK		 4278 struct block_device *bdev;
4279
0390131b
FM		 4280 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4281
b31e1552 4282 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4283 if (bdev == NULL)
4284 return NULL;
4285
ac27a0ec 4286 blocksize = sb->s_blocksize;
e1defc4f 4287 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4288 if (blocksize < hblock) {
b31e1552
ES		 4289 ext4_msg(sb, KERN_ERR,
4290 "blocksize too small for journal device");
ac27a0ec
DK		 4291 goto out_bdev;
4292 }
4293
617ba13b
MC		 4294 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4295 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4296 set_blocksize(bdev, blocksize);
4297 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4298 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4299 "external journal");
ac27a0ec
DK		 4300 goto out_bdev;
4301 }
4302
2716b802 4303 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4304 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4305 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4306 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4307 ext4_msg(sb, KERN_ERR, "external journal has "
4308 "bad superblock");
ac27a0ec
DK		 4309 brelse(bh);
4310 goto out_bdev;
4311 }
4312
617ba13b 4313 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4314 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4315 brelse(bh);
4316 goto out_bdev;
4317 }
4318
bd81d8ee 4319 len = ext4_blocks_count(es);
ac27a0ec
DK		 4320 start = sb_block + 1;
4321 brelse(bh); /* we're done with the superblock */
4322
dab291af 4323 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4324 start, len, blocksize);
4325 if (!journal) {
b31e1552 4326 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4327 goto out_bdev;
4328 }
4329 journal->j_private = sb;
9f203507 4330 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4331 wait_on_buffer(journal->j_sb_buffer);
4332 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4333 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4334 goto out_journal;
4335 }
4336 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4337 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4338 "user (unsupported) - %d",
ac27a0ec
DK		 4339 be32_to_cpu(journal->j_superblock->s_nr_users));
4340 goto out_journal;
4341 }
617ba13b
MC		 4342 EXT4_SB(sb)->journal_bdev = bdev;
4343 ext4_init_journal_params(sb, journal);
ac27a0ec 4344 return journal;
0b8e58a1 4345
ac27a0ec 4346out_journal:
dab291af 4347 jbd2_journal_destroy(journal);
ac27a0ec 4348out_bdev:
617ba13b 4349 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4350 return NULL;
4351}
4352
617ba13b
MC		 4353static int ext4_load_journal(struct super_block *sb,
4354 struct ext4_super_block *es,
ac27a0ec
DK		 4355 unsigned long journal_devnum)
4356{
4357 journal_t *journal;
4358 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4359 dev_t journal_dev;
4360 int err = 0;
4361 int really_read_only;
4362
0390131b
FM		 4363 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4364
ac27a0ec
DK		 4365 if (journal_devnum &&
4366 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4367 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4368 "numbers have changed");
ac27a0ec
DK		 4369 journal_dev = new_decode_dev(journal_devnum);
4370 } else
4371 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4372
4373 really_read_only = bdev_read_only(sb->s_bdev);
4374
4375 /*
4376 * Are we loading a blank journal or performing recovery after a
4377 * crash? For recovery, we need to check in advance whether we
4378 * can get read-write access to the device.
4379 */
617ba13b 4380 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4381 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4382 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4383 "required on readonly filesystem");
ac27a0ec 4384 if (really_read_only) {
b31e1552
ES		 4385 ext4_msg(sb, KERN_ERR, "write access "
4386 "unavailable, cannot proceed");
ac27a0ec
DK		 4387 return -EROFS;
4388 }
b31e1552
ES		 4389 ext4_msg(sb, KERN_INFO, "write access will "
4390 "be enabled during recovery");
ac27a0ec
DK		 4391 }
4392 }
4393
4394 if (journal_inum && journal_dev) {
b31e1552
ES		 4395 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4396 "and inode journals!");
ac27a0ec
DK		 4397 return -EINVAL;
4398 }
4399
4400 if (journal_inum) {
617ba13b 4401 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4402 return -EINVAL;
4403 } else {
617ba13b 4404 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4405 return -EINVAL;
4406 }
4407
90576c0b 4408 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4409 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4410
617ba13b 4411 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4412 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4413 if (!err) {
4414 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4415 if (save)
4416 memcpy(save, ((char *) es) +
4417 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4418 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4419 if (save)
4420 memcpy(((char *) es) + EXT4_S_ERR_START,
4421 save, EXT4_S_ERR_LEN);
4422 kfree(save);
4423 }
ac27a0ec
DK		 4424
4425 if (err) {
b31e1552 4426 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4427 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4428 return err;
4429 }
4430
617ba13b
MC		 4431 EXT4_SB(sb)->s_journal = journal;
4432 ext4_clear_journal_err(sb, es);
ac27a0ec 4433
c41303ce 4434 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4435 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4436 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4437
4438 /* Make sure we flush the recovery flag to disk. */
e2d67052 4439 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4440 }
4441
4442 return 0;
4443}
4444
e2d67052 4445static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4446{
e2d67052 4447 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4448 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4449 int error = 0;
ac27a0ec 4450
7c2e7087 4451 if (!sbh || block_device_ejected(sb))
c4be0c1d 4452 return error;
914258bf
TT		 4453 if (buffer_write_io_error(sbh)) {
4454 /*
4455 * Oh, dear. A previous attempt to write the
4456 * superblock failed. This could happen because the
4457 * USB device was yanked out. Or it could happen to
4458 * be a transient write error and maybe the block will
4459 * be remapped. Nothing we can do but to retry the
4460 * write and hope for the best.
4461 */
b31e1552
ES		 4462 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4463 "superblock detected");
914258bf
TT		 4464 clear_buffer_write_io_error(sbh);
4465 set_buffer_uptodate(sbh);
4466 }
71290b36
TT		 4467 /*
4468 * If the file system is mounted read-only, don't update the
4469 * superblock write time. This avoids updating the superblock
4470 * write time when we are mounting the root file system
4471 * read/only but we need to replay the journal; at that point,
4472 * for people who are east of GMT and who make their clock
4473 * tick in localtime for Windows bug-for-bug compatibility,
4474 * the clock is set in the future, and this will cause e2fsck
4475 * to complain and force a full file system check.
4476 */
4477 if (!(sb->s_flags & MS_RDONLY))
4478 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4479 if (sb->s_bdev->bd_part)
4480 es->s_kbytes_written =
4481 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4482 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4483 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4484 else
4485 es->s_kbytes_written =
4486 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4487 ext4_free_blocks_count_set(es,
4488 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4489 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4490 es->s_free_inodes_count =
4491 cpu_to_le32(percpu_counter_sum_positive(
4492 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4493 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4494 ext4_superblock_csum_set(sb);
ac27a0ec 4495 mark_buffer_dirty(sbh);
914258bf 4496 if (sync) {
c4be0c1d
TS		 4497 error = sync_dirty_buffer(sbh);
4498 if (error)
4499 return error;
4500
4501 error = buffer_write_io_error(sbh);
4502 if (error) {
b31e1552
ES		 4503 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4504 "superblock");
914258bf
TT		 4505 clear_buffer_write_io_error(sbh);
4506 set_buffer_uptodate(sbh);
4507 }
4508 }
c4be0c1d 4509 return error;
ac27a0ec
DK		 4510}
4511
ac27a0ec
DK		 4512/*
4513 * Have we just finished recovery? If so, and if we are mounting (or
4514 * remounting) the filesystem readonly, then we will end up with a
4515 * consistent fs on disk. Record that fact.
4516 */
2b2d6d01
TT		 4517static void ext4_mark_recovery_complete(struct super_block *sb,
4518 struct ext4_super_block *es)
ac27a0ec 4519{
617ba13b 4520 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4521
0390131b
FM		 4522 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4523 BUG_ON(journal != NULL);
4524 return;
4525 }
dab291af 4526 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4527 if (jbd2_journal_flush(journal) < 0)
4528 goto out;
4529
617ba13b 4530 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4531 sb->s_flags & MS_RDONLY) {
617ba13b 4532 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4533 ext4_commit_super(sb, 1);
ac27a0ec 4534 }
7ffe1ea8
HK		 4535
4536out:
dab291af 4537 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4538}
4539
4540/*
4541 * If we are mounting (or read-write remounting) a filesystem whose journal
4542 * has recorded an error from a previous lifetime, move that error to the
4543 * main filesystem now.
4544 */
2b2d6d01
TT		 4545static void ext4_clear_journal_err(struct super_block *sb,
4546 struct ext4_super_block *es)
ac27a0ec
DK		 4547{
4548 journal_t *journal;
4549 int j_errno;
4550 const char *errstr;
4551
0390131b
FM		 4552 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4553
617ba13b 4554 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4555
4556 /*
4557 * Now check for any error status which may have been recorded in the
617ba13b 4558 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4559 */
4560
dab291af 4561 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4562 if (j_errno) {
4563 char nbuf[16];
4564
617ba13b 4565 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4566 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4567 "from previous mount: %s", errstr);
12062ddd 4568 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4569
617ba13b
MC		 4570 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4571 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4572 ext4_commit_super(sb, 1);
ac27a0ec 4573
dab291af 4574 jbd2_journal_clear_err(journal);
d796c52e 4575 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4576 }
4577}
4578
4579/*
4580 * Force the running and committing transactions to commit,
4581 * and wait on the commit.
4582 */
617ba13b 4583int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4584{
4585 journal_t *journal;
ac27a0ec
DK		 4586
4587 if (sb->s_flags & MS_RDONLY)
4588 return 0;
4589
617ba13b 4590 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4591 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4592}
4593
617ba13b 4594static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4595{
14ce0cb4 4596 int ret = 0;
9eddacf9 4597 tid_t target;
8d5d02e6 4598 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4599
9bffad1e 4600 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4601 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4602 /*
4603 * Writeback quota in non-journalled quota case - journalled quota has
4604 * no dirty dquots
4605 */
4606 dquot_writeback_dquots(sb, -1);
8d5d02e6 4607 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4608 if (wait)
8d5d02e6 4609 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4610 }
14ce0cb4 4611 return ret;
ac27a0ec
DK		 4612}
4613
4614/*
4615 * LVM calls this function before a (read-only) snapshot is created. This
4616 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4617 *
4618 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4619 * state independently. It relies on upper layer to stop all data & metadata
4620 * modifications.
ac27a0ec 4621 */
c4be0c1d 4622static int ext4_freeze(struct super_block *sb)
ac27a0ec 4623{
c4be0c1d
TS		 4624 int error = 0;
4625 journal_t *journal;
ac27a0ec 4626
9ca92389
TT		 4627 if (sb->s_flags & MS_RDONLY)
4628 return 0;
ac27a0ec 4629
9ca92389 4630 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4631
9ca92389
TT		 4632 /* Now we set up the journal barrier. */
4633 jbd2_journal_lock_updates(journal);
ac27a0ec 4634
9ca92389
TT		 4635 /*
4636 * Don't clear the needs_recovery flag if we failed to flush
4637 * the journal.
4638 */
4639 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4640 if (error < 0)
4641 goto out;
9ca92389
TT		 4642
4643 /* Journal blocked and flushed, clear needs_recovery flag. */
4644 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4645 error = ext4_commit_super(sb, 1);
6b0310fb 4646out:
8e8ad8a5 4647 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4648 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4649 return error;
ac27a0ec
DK		 4650}
4651
4652/*
4653 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4654 * flag here, even though the filesystem is not technically dirty yet.
4655 */
c4be0c1d 4656static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4657{
9ca92389
TT		 4658 if (sb->s_flags & MS_RDONLY)
4659 return 0;
4660
9ca92389
TT		 4661 /* Reset the needs_recovery flag before the fs is unlocked. */
4662 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4663 ext4_commit_super(sb, 1);
c4be0c1d 4664 return 0;
ac27a0ec
DK		 4665}
4666
673c6100
TT		 4667/*
4668 * Structure to save mount options for ext4_remount's benefit
4669 */
4670struct ext4_mount_options {
4671 unsigned long s_mount_opt;
a2595b8a 4672 unsigned long s_mount_opt2;
08cefc7a
EB		 4673 kuid_t s_resuid;
4674 kgid_t s_resgid;
673c6100
TT		 4675 unsigned long s_commit_interval;
4676 u32 s_min_batch_time, s_max_batch_time;
4677#ifdef CONFIG_QUOTA
4678 int s_jquota_fmt;
4679 char *s_qf_names[MAXQUOTAS];
4680#endif
4681};
4682
2b2d6d01 4683static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4684{
2b2d6d01 4685 struct ext4_super_block *es;
617ba13b 4686 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4687 unsigned long old_sb_flags;
617ba13b 4688 struct ext4_mount_options old_opts;
c79d967d 4689 int enable_quota = 0;
8a266467 4690 ext4_group_t g;
b3881f74 4691 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4692 int err = 0;
ac27a0ec 4693#ifdef CONFIG_QUOTA
03dafb5f 4694 int i, j;
ac27a0ec 4695#endif
d4c402d9 4696 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4697
4698 /* Store the original options */
4699 old_sb_flags = sb->s_flags;
4700 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4701 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4702 old_opts.s_resuid = sbi->s_resuid;
4703 old_opts.s_resgid = sbi->s_resgid;
4704 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4705 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4706 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4707#ifdef CONFIG_QUOTA
4708 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4709 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f
CG		 4710 if (sbi->s_qf_names[i]) {
4711 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4712 GFP_KERNEL);
4713 if (!old_opts.s_qf_names[i]) {
4714 for (j = 0; j < i; j++)
4715 kfree(old_opts.s_qf_names[j]);
3e36a163 4716 kfree(orig_data);
03dafb5f
CG		 4717 return -ENOMEM;
4718 }
4719 } else
4720 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4721#endif
b3881f74
TT		 4722 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4723 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4724
4725 /*
4726 * Allow the "check" option to be passed as a remount option.
4727 */
661aa520 4728 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4729 err = -EINVAL;
4730 goto restore_opts;
4731 }
4732
c4fa1009
PS		 4733 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4734 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4735 ext4_msg(sb, KERN_ERR, "can't mount with "
4736 "both data=journal and delalloc");
4737 err = -EINVAL;
4738 goto restore_opts;
4739 }
4740 if (test_opt(sb, DIOREAD_NOLOCK)) {
4741 ext4_msg(sb, KERN_ERR, "can't mount with "
4742 "both data=journal and dioread_nolock");
4743 err = -EINVAL;
4744 goto restore_opts;
4745 }
4746 }
4747
4ab2f15b 4748 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4749 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4750
4751 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4752 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4753
4754 es = sbi->s_es;
4755
b3881f74 4756 if (sbi->s_journal) {
0390131b 4757 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4758 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4759 }
ac27a0ec 4760
661aa520 4761 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4762 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4763 err = -EROFS;
4764 goto restore_opts;
4765 }
4766
4767 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4768 err = dquot_suspend(sb, -1);
4769 if (err < 0)
c79d967d 4770 goto restore_opts;
c79d967d 4771
ac27a0ec
DK		 4772 /*
4773 * First of all, the unconditional stuff we have to do
4774 * to disable replay of the journal when we next remount
4775 */
4776 sb->s_flags |= MS_RDONLY;
4777
4778 /*
4779 * OK, test if we are remounting a valid rw partition
4780 * readonly, and if so set the rdonly flag and then
4781 * mark the partition as valid again.
4782 */
617ba13b
MC		 4783 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4784 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4785 es->s_state = cpu_to_le16(sbi->s_mount_state);
4786
a63c9eb2 4787 if (sbi->s_journal)
0390131b 4788 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4789 } else {
a13fb1a4
ES		 4790 /* Make sure we can mount this feature set readwrite */
4791 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4792 err = -EROFS;
4793 goto restore_opts;
4794 }
8a266467
TT		 4795 /*
4796 * Make sure the group descriptor checksums
0b8e58a1 4797 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4798 */
4799 for (g = 0; g < sbi->s_groups_count; g++) {
4800 struct ext4_group_desc *gdp =
4801 ext4_get_group_desc(sb, g, NULL);
4802
feb0ab32 4803 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4804 ext4_msg(sb, KERN_ERR,
4805 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4806 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4807 le16_to_cpu(gdp->bg_checksum));
4808 err = -EINVAL;
4809 goto restore_opts;
4810 }
4811 }
4812
ead6596b
ES		 4813 /*
4814 * If we have an unprocessed orphan list hanging
4815 * around from a previously readonly bdev mount,
4816 * require a full umount/remount for now.
4817 */
4818 if (es->s_last_orphan) {
b31e1552 4819 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4820 "remount RDWR because of unprocessed "
4821 "orphan inode list. Please "
b31e1552 4822 "umount/remount instead");
ead6596b
ES		 4823 err = -EINVAL;
4824 goto restore_opts;
4825 }
4826
ac27a0ec
DK		 4827 /*
4828 * Mounting a RDONLY partition read-write, so reread
4829 * and store the current valid flag. (It may have
4830 * been changed by e2fsck since we originally mounted
4831 * the partition.)
4832 */
0390131b
FM		 4833 if (sbi->s_journal)
4834 ext4_clear_journal_err(sb, es);
ac27a0ec 4835 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4836 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4837 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4838 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4839 EXT4_FEATURE_INCOMPAT_MMP))
4840 if (ext4_multi_mount_protect(sb,
4841 le64_to_cpu(es->s_mmp_block))) {
4842 err = -EROFS;
4843 goto restore_opts;
4844 }
c79d967d 4845 enable_quota = 1;
ac27a0ec
DK		 4846 }
4847 }
bfff6873
LC		 4848
4849 /*
4850 * Reinitialize lazy itable initialization thread based on
4851 * current settings
4852 */
4853 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4854 ext4_unregister_li_request(sb);
4855 else {
4856 ext4_group_t first_not_zeroed;
4857 first_not_zeroed = ext4_has_uninit_itable(sb);
4858 ext4_register_li_request(sb, first_not_zeroed);
4859 }
4860
6fd058f7 4861 ext4_setup_system_zone(sb);
d096ad0f 4862 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4863 ext4_commit_super(sb, 1);
0390131b 4864
ac27a0ec
DK		 4865#ifdef CONFIG_QUOTA
4866 /* Release old quota file names */
4867 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f 4868 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4869 if (enable_quota) {
4870 if (sb_any_quota_suspended(sb))
4871 dquot_resume(sb, -1);
4872 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4873 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4874 err = ext4_enable_quotas(sb);
07724f98 4875 if (err)
7c319d32 4876 goto restore_opts;
7c319d32
AK		 4877 }
4878 }
ac27a0ec 4879#endif
d4c402d9
CW		 4880
4881 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4882 kfree(orig_data);
ac27a0ec 4883 return 0;
0b8e58a1 4884
ac27a0ec
DK		 4885restore_opts:
4886 sb->s_flags = old_sb_flags;
4887 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4888 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4889 sbi->s_resuid = old_opts.s_resuid;
4890 sbi->s_resgid = old_opts.s_resgid;
4891 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4892 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4893 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4894#ifdef CONFIG_QUOTA
4895 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4896 for (i = 0; i < MAXQUOTAS; i++) {
03dafb5f 4897 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4898 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4899 }
4900#endif
d4c402d9 4901 kfree(orig_data);
ac27a0ec
DK		 4902 return err;
4903}
4904
2b2d6d01 4905static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4906{
4907 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4908 struct ext4_sb_info *sbi = EXT4_SB(sb);
4909 struct ext4_super_block *es = sbi->s_es;
27dd4385 4910 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4911 u64 fsid;
d02a9391 4912 s64 bfree;
27dd4385 4913 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4914
952fc18e
TT		 4915 if (!test_opt(sb, MINIX_DF))
4916 overhead = sbi->s_overhead;
ac27a0ec 4917
617ba13b 4918 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4919 buf->f_bsize = sb->s_blocksize;
b72f78cb 4920 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4921 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4922 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4923 /* prevent underflow in case that few free space is available */
57042651 4924 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4925 buf->f_bavail = buf->f_bfree -
4926 (ext4_r_blocks_count(es) + resv_blocks);
4927 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4928 buf->f_bavail = 0;
4929 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4930 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4931 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4932 fsid = le64_to_cpup((void *)es->s_uuid) ^
4933 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4934 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4935 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4936
ac27a0ec
DK		 4937 return 0;
4938}
4939
0b8e58a1
AD		 4940/* Helper function for writing quotas on sync - we need to start transaction
4941 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4942 * Process 1 Process 2
617ba13b 4943 * ext4_create() quota_sync()
a269eb18 4944 * jbd2_journal_start() write_dquot()
871a2931 4945 * dquot_initialize() down(dqio_mutex)
dab291af 4946 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4947 *
4948 */
4949
4950#ifdef CONFIG_QUOTA
4951
4952static inline struct inode *dquot_to_inode(struct dquot *dquot)
4953{
4c376dca 4954 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4955}
4956
617ba13b 4957static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4958{
4959 int ret, err;
4960 handle_t *handle;
4961 struct inode *inode;
4962
4963 inode = dquot_to_inode(dquot);
9924a92a 4964 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4965 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4966 if (IS_ERR(handle))
4967 return PTR_ERR(handle);
4968 ret = dquot_commit(dquot);
617ba13b 4969 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4970 if (!ret)
4971 ret = err;
4972 return ret;
4973}
4974
617ba13b 4975static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4976{
4977 int ret, err;
4978 handle_t *handle;
4979
9924a92a 4980 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4981 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4982 if (IS_ERR(handle))
4983 return PTR_ERR(handle);
4984 ret = dquot_acquire(dquot);
617ba13b 4985 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4986 if (!ret)
4987 ret = err;
4988 return ret;
4989}
4990
617ba13b 4991static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4992{
4993 int ret, err;
4994 handle_t *handle;
4995
9924a92a 4996 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4997 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4998 if (IS_ERR(handle)) {
4999 /* Release dquot anyway to avoid endless cycle in dqput() */
5000 dquot_release(dquot);
ac27a0ec 5001 return PTR_ERR(handle);
9c3013e9 5002 }
ac27a0ec 5003 ret = dquot_release(dquot);
617ba13b 5004 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5005 if (!ret)
5006 ret = err;
5007 return ret;
5008}
5009
617ba13b 5010static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5011{
262b4662
JK		 5012 struct super_block *sb = dquot->dq_sb;
5013 struct ext4_sb_info *sbi = EXT4_SB(sb);
5014
2c8be6b2 5015 /* Are we journaling quotas? */
262b4662
JK		 5016 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5017 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5018 dquot_mark_dquot_dirty(dquot);
617ba13b 5019 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5020 } else {
5021 return dquot_mark_dquot_dirty(dquot);
5022 }
5023}
5024
617ba13b 5025static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5026{
5027 int ret, err;
5028 handle_t *handle;
5029
5030 /* Data block + inode block */
9924a92a 5031 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5032 if (IS_ERR(handle))
5033 return PTR_ERR(handle);
5034 ret = dquot_commit_info(sb, type);
617ba13b 5035 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5036 if (!ret)
5037 ret = err;
5038 return ret;
5039}
5040
5041/*
5042 * Turn on quotas during mount time - we need to find
5043 * the quota file and such...
5044 */
617ba13b 5045static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5046{
287a8095
CH		 5047 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5048 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5049}
5050
6a2ba9c0
TT		 5051static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5052{
5053 struct ext4_inode_info *ei = EXT4_I(inode);
5054
5055 /* The first argument of lockdep_set_subclass has to be
5056 * *exactly* the same as the argument to init_rwsem() --- in
5057 * this case, in init_once() --- or lockdep gets unhappy
5058 * because the name of the lock is set using the
5059 * stringification of the argument to init_rwsem().
5060 */
5061 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5062 lockdep_set_subclass(&ei->i_data_sem, subclass);
5063}
5064
ac27a0ec
DK		 5065/*
5066 * Standard function to be called on quota_on
5067 */
617ba13b 5068static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5069 struct path *path)
ac27a0ec
DK		 5070{
5071 int err;
ac27a0ec
DK		 5072
5073 if (!test_opt(sb, QUOTA))
5074 return -EINVAL;
0623543b 5075
ac27a0ec 5076 /* Quotafile not on the same filesystem? */
d8c9584e 5077 if (path->dentry->d_sb != sb)
ac27a0ec 5078 return -EXDEV;
0623543b
JK		 5079 /* Journaling quota? */
5080 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5081 /* Quotafile not in fs root? */
f00c9e44 5082 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5083 ext4_msg(sb, KERN_WARNING,
5084 "Quota file not on filesystem root. "
5085 "Journaled quota will not work");
2b2d6d01 5086 }
0623543b
JK		 5087
5088 /*
5089 * When we journal data on quota file, we have to flush journal to see
5090 * all updates to the file when we bypass pagecache...
5091 */
0390131b 5092 if (EXT4_SB(sb)->s_journal &&
f00c9e44 5093 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 5094 /*
5095 * We don't need to lock updates but journal_flush() could
5096 * otherwise be livelocked...
5097 */
5098 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5099 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5100 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5101 if (err)
7ffe1ea8 5102 return err;
0623543b 5103 }
6a2ba9c0
TT		 5104 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5105 err = dquot_quota_on(sb, type, format_id, path);
5106 if (err)
5107 lockdep_set_quota_inode(path->dentry->d_inode,
5108 I_DATA_SEM_NORMAL);
5109 return err;
ac27a0ec
DK		 5110}
5111
7c319d32
AK		 5112static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5113 unsigned int flags)
5114{
5115 int err;
5116 struct inode *qf_inode;
5117 unsigned long qf_inums[MAXQUOTAS] = {
5118 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5119 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5120 };
5121
5122 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5123
5124 if (!qf_inums[type])
5125 return -EPERM;
5126
5127 qf_inode = ext4_iget(sb, qf_inums[type]);
5128 if (IS_ERR(qf_inode)) {
5129 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5130 return PTR_ERR(qf_inode);
5131 }
5132
bcb13850
JK		 5133 /* Don't account quota for quota files to avoid recursion */
5134 qf_inode->i_flags |= S_NOQUOTA;
6a2ba9c0 5135 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5136 err = dquot_enable(qf_inode, type, format_id, flags);
5137 iput(qf_inode);
6a2ba9c0
TT		 5138 if (err)
5139 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5140
5141 return err;
5142}
5143
5144/* Enable usage tracking for all quota types. */
5145static int ext4_enable_quotas(struct super_block *sb)
5146{
5147 int type, err = 0;
5148 unsigned long qf_inums[MAXQUOTAS] = {
5149 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5150 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5151 };
5152
5153 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5154 for (type = 0; type < MAXQUOTAS; type++) {
5155 if (qf_inums[type]) {
5156 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5157 DQUOT_USAGE_ENABLED);
5158 if (err) {
5159 ext4_warning(sb,
72ba7450
TT		 5160 "Failed to enable quota tracking "
5161 "(type=%d, err=%d). Please run "
5162 "e2fsck to fix.", type, err);
7c319d32
AK		 5163 return err;
5164 }
5165 }
5166 }
5167 return 0;
5168}
5169
5170/*
5171 * quota_on function that is used when QUOTA feature is set.
5172 */
5173static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5174 int format_id)
5175{
5176 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5177 return -EINVAL;
5178
5179 /*
5180 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5181 */
5182 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5183}
5184
ca0e05e4
DM		 5185static int ext4_quota_off(struct super_block *sb, int type)
5186{
21f97697
JK		 5187 struct inode *inode = sb_dqopt(sb)->files[type];
5188 handle_t *handle;
5189
87009d86
DM		 5190 /* Force all delayed allocation blocks to be allocated.
5191 * Caller already holds s_umount sem */
5192 if (test_opt(sb, DELALLOC))
ca0e05e4 5193 sync_filesystem(sb);
ca0e05e4 5194
0b268590
AG		 5195 if (!inode)
5196 goto out;
5197
21f97697
JK		 5198 /* Update modification times of quota files when userspace can
5199 * start looking at them */
9924a92a 5200 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5201 if (IS_ERR(handle))
5202 goto out;
5203 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5204 ext4_mark_inode_dirty(handle, inode);
5205 ext4_journal_stop(handle);
5206
5207out:
ca0e05e4
DM		 5208 return dquot_quota_off(sb, type);
5209}
5210
7c319d32
AK		 5211/*
5212 * quota_off function that is used when QUOTA feature is set.
5213 */
5214static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5215{
5216 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5217 return -EINVAL;
5218
5219 /* Disable only the limits. */
5220 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5221}
5222
ac27a0ec
DK		 5223/* Read data from quotafile - avoid pagecache and such because we cannot afford
5224 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5225 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5226 * we don't have to be afraid of races */
617ba13b 5227static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5228 size_t len, loff_t off)
5229{
5230 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5231 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5232 int err = 0;
5233 int offset = off & (sb->s_blocksize - 1);
5234 int tocopy;
5235 size_t toread;
5236 struct buffer_head *bh;
5237 loff_t i_size = i_size_read(inode);
5238
5239 if (off > i_size)
5240 return 0;
5241 if (off+len > i_size)
5242 len = i_size-off;
5243 toread = len;
5244 while (toread > 0) {
5245 tocopy = sb->s_blocksize - offset < toread ?
5246 sb->s_blocksize - offset : toread;
617ba13b 5247 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5248 if (err)
5249 return err;
5250 if (!bh) /* A hole? */
5251 memset(data, 0, tocopy);
5252 else
5253 memcpy(data, bh->b_data+offset, tocopy);
5254 brelse(bh);
5255 offset = 0;
5256 toread -= tocopy;
5257 data += tocopy;
5258 blk++;
5259 }
5260 return len;
5261}
5262
5263/* Write to quotafile (we know the transaction is already started and has
5264 * enough credits) */
617ba13b 5265static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5266 const char *data, size_t len, loff_t off)
5267{
5268 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5269 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5270 int err = 0;
5271 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5272 struct buffer_head *bh;
5273 handle_t *handle = journal_current_handle();
5274
0390131b 5275 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5276 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5277 " cancelled because transaction is not started",
9c3013e9
JK		 5278 (unsigned long long)off, (unsigned long long)len);
5279 return -EIO;
5280 }
67eeb568
DM		 5281 /*
5282 * Since we account only one data block in transaction credits,
5283 * then it is impossible to cross a block boundary.
5284 */
5285 if (sb->s_blocksize - offset < len) {
5286 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5287 " cancelled because not block aligned",
5288 (unsigned long long)off, (unsigned long long)len);
5289 return -EIO;
5290 }
5291
67eeb568
DM		 5292 bh = ext4_bread(handle, inode, blk, 1, &err);
5293 if (!bh)
5294 goto out;
62d2b5f2
JK		 5295 err = ext4_journal_get_write_access(handle, bh);
5296 if (err) {
5297 brelse(bh);
5298 goto out;
ac27a0ec 5299 }
67eeb568
DM		 5300 lock_buffer(bh);
5301 memcpy(bh->b_data+offset, data, len);
5302 flush_dcache_page(bh->b_page);
5303 unlock_buffer(bh);
62d2b5f2 5304 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5305 brelse(bh);
ac27a0ec 5306out:
0b7f7cef 5307 if (err)
ac27a0ec 5308 return err;
67eeb568
DM		 5309 if (inode->i_size < off + len) {
5310 i_size_write(inode, off + len);
617ba13b 5311 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5312 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5313 }
67eeb568 5314 return len;
ac27a0ec
DK		 5315}
5316
5317#endif
5318
152a0836
AV		 5319static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5320 const char *dev_name, void *data)
ac27a0ec 5321{
152a0836 5322 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5323}
5324
37f328eb 5325#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5326static inline void register_as_ext2(void)
5327{
5328 int err = register_filesystem(&ext2_fs_type);
5329 if (err)
5330 printk(KERN_WARNING
5331 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5332}
5333
5334static inline void unregister_as_ext2(void)
5335{
5336 unregister_filesystem(&ext2_fs_type);
5337}
2035e776
TT		 5338
5339static inline int ext2_feature_set_ok(struct super_block *sb)
5340{
5341 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5342 return 0;
5343 if (sb->s_flags & MS_RDONLY)
5344 return 1;
5345 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5346 return 0;
5347 return 1;
5348}
24b58424
TT		 5349#else
5350static inline void register_as_ext2(void) { }
5351static inline void unregister_as_ext2(void) { }
2035e776 5352static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5353#endif
5354
37f328eb 5355#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5356static inline void register_as_ext3(void)
5357{
5358 int err = register_filesystem(&ext3_fs_type);
5359 if (err)
5360 printk(KERN_WARNING
5361 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5362}
5363
5364static inline void unregister_as_ext3(void)
5365{
5366 unregister_filesystem(&ext3_fs_type);
5367}
2035e776
TT		 5368
5369static inline int ext3_feature_set_ok(struct super_block *sb)
5370{
5371 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5372 return 0;
5373 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5374 return 0;
5375 if (sb->s_flags & MS_RDONLY)
5376 return 1;
5377 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5378 return 0;
5379 return 1;
5380}
24b58424
TT		 5381#else
5382static inline void register_as_ext3(void) { }
5383static inline void unregister_as_ext3(void) { }
2035e776 5384static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5385#endif
5386
03010a33
TT		 5387static struct file_system_type ext4_fs_type = {
5388 .owner = THIS_MODULE,
5389 .name = "ext4",
152a0836 5390 .mount = ext4_mount,
03010a33
TT		 5391 .kill_sb = kill_block_super,
5392 .fs_flags = FS_REQUIRES_DEV,
5393};
7f78e035 5394MODULE_ALIAS_FS("ext4");
03010a33 5395
8f021222 5396static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5397{
5398 struct ext4_features *ef;
5399 int ret = -ENOMEM;
5400
5401 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5402 if (!ef)
5403 goto out;
5404
5405 ef->f_kobj.kset = ext4_kset;
5406 init_completion(&ef->f_kobj_unregister);
5407 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5408 "features");
5409 if (ret) {
5410 kfree(ef);
5411 goto out;
5412 }
5413
5414 ext4_feat = ef;
5415 ret = 0;
5416out:
5417 return ret;
5418}
5419
8f021222
LC		 5420static void ext4_exit_feat_adverts(void)
5421{
5422 kobject_put(&ext4_feat->f_kobj);
5423 wait_for_completion(&ext4_feat->f_kobj_unregister);
5424 kfree(ext4_feat);
5425}
5426
e9e3bcec
ES		 5427/* Shared across all ext4 file systems */
5428wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5429struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5430
5dabfc78 5431static int __init ext4_init_fs(void)
ac27a0ec 5432{
e9e3bcec 5433 int i, err;
c9de560d 5434
07c0c5d8
AV		 5435 ext4_li_info = NULL;
5436 mutex_init(&ext4_li_mtx);
5437
9a4c8019 5438 /* Build-time check for flags consistency */
12e9b892 5439 ext4_check_flag_values();
e9e3bcec
ES		 5440
5441 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5442 mutex_init(&ext4__aio_mutex[i]);
5443 init_waitqueue_head(&ext4__ioend_wq[i]);
5444 }
5445
51865fda 5446 err = ext4_init_es();
6fd058f7
TT		 5447 if (err)
5448 return err;
51865fda
ZL		 5449
5450 err = ext4_init_pageio();
5451 if (err)
5452 goto out7;
5453
5dabfc78 5454 err = ext4_init_system_zone();
bd2d0210 5455 if (err)
d44651d0 5456 goto out6;
3197ebdb 5457 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5458 if (!ext4_kset) {
5459 err = -ENOMEM;
dd68314c 5460 goto out5;
0e376b1e 5461 }
d44651d0 5462 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5463
5464 err = ext4_init_feat_adverts();
dd68314c
TT		 5465 if (err)
5466 goto out4;
857ac889 5467
5dabfc78 5468 err = ext4_init_mballoc();
ac27a0ec 5469 if (err)
6fd058f7 5470 goto out3;
c9de560d 5471
5dabfc78 5472 err = ext4_init_xattr();
c9de560d
AT		 5473 if (err)
5474 goto out2;
ac27a0ec
DK		 5475 err = init_inodecache();
5476 if (err)
5477 goto out1;
24b58424 5478 register_as_ext3();
2035e776 5479 register_as_ext2();
03010a33 5480 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5481 if (err)
5482 goto out;
bfff6873 5483
ac27a0ec
DK		 5484 return 0;
5485out:
24b58424
TT		 5486 unregister_as_ext2();
5487 unregister_as_ext3();
ac27a0ec
DK		 5488 destroy_inodecache();
5489out1:
5dabfc78 5490 ext4_exit_xattr();
c9de560d 5491out2:
5dabfc78 5492 ext4_exit_mballoc();
6fd058f7 5493out3:
8f021222 5494 ext4_exit_feat_adverts();
dd68314c 5495out4:
d44651d0
FJ		 5496 if (ext4_proc_root)
5497 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5498 kset_unregister(ext4_kset);
d44651d0 5499out5:
5dabfc78 5500 ext4_exit_system_zone();
d44651d0 5501out6:
5dabfc78 5502 ext4_exit_pageio();
51865fda
ZL		 5503out7:
5504 ext4_exit_es();
5505
ac27a0ec
DK		 5506 return err;
5507}
5508
5dabfc78 5509static void __exit ext4_exit_fs(void)
ac27a0ec 5510{
bfff6873 5511 ext4_destroy_lazyinit_thread();
24b58424
TT		 5512 unregister_as_ext2();
5513 unregister_as_ext3();
03010a33 5514 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5515 destroy_inodecache();
5dabfc78
TT		 5516 ext4_exit_xattr();
5517 ext4_exit_mballoc();
8f021222 5518 ext4_exit_feat_adverts();
9f6200bb 5519 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5520 kset_unregister(ext4_kset);
5dabfc78
TT		 5521 ext4_exit_system_zone();
5522 ext4_exit_pageio();
9aff080c 5523 ext4_exit_es();
ac27a0ec
DK		 5524}
5525
5526MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5527MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5528MODULE_LICENSE("GPL");
5dabfc78
TT		 5529module_init(ext4_init_fs)
5530module_exit(ext4_exit_fs)
kernel source for telekom puls (alcatel/mediatek)