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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
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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);
ac27a0ec 84
2035e776
TT		 85#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
86static struct file_system_type ext2_fs_type = {
87 .owner = THIS_MODULE,
88 .name = "ext2",
89 .mount = ext4_mount,
90 .kill_sb = kill_block_super,
91 .fs_flags = FS_REQUIRES_DEV,
92};
7f78e035 93MODULE_ALIAS_FS("ext2");
fa7614dd 94MODULE_ALIAS("ext2");
2035e776
TT		 95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
7f78e035 109MODULE_ALIAS_FS("ext3");
fa7614dd 110MODULE_ALIAS("ext3");
ba69f9ab
JK		 111#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
112#else
113#define IS_EXT3_SB(sb) (0)
114#endif
bd81d8ee 115
d25425f8
DW		 116static int ext4_verify_csum_type(struct super_block *sb,
117 struct ext4_super_block *es)
118{
119 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
120 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
121 return 1;
122
123 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
124}
125
a9c47317
DW		 126static __le32 ext4_superblock_csum(struct super_block *sb,
127 struct ext4_super_block *es)
128{
129 struct ext4_sb_info *sbi = EXT4_SB(sb);
130 int offset = offsetof(struct ext4_super_block, s_checksum);
131 __u32 csum;
132
133 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
134
135 return cpu_to_le32(csum);
136}
137
138int ext4_superblock_csum_verify(struct super_block *sb,
139 struct ext4_super_block *es)
140{
141 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
142 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
143 return 1;
144
145 return es->s_checksum == ext4_superblock_csum(sb, es);
146}
147
06db49e6 148void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 149{
06db49e6
TT		 150 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
151
a9c47317
DW		 152 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
153 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
154 return;
155
156 es->s_checksum = ext4_superblock_csum(sb, es);
157}
158
9933fc0a
TT		 159void *ext4_kvmalloc(size_t size, gfp_t flags)
160{
161 void *ret;
162
163 ret = kmalloc(size, flags);
164 if (!ret)
165 ret = __vmalloc(size, flags, PAGE_KERNEL);
166 return ret;
167}
168
169void *ext4_kvzalloc(size_t size, gfp_t flags)
170{
171 void *ret;
172
db9481c0 173 ret = kzalloc(size, flags);
9933fc0a
TT		 174 if (!ret)
175 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
176 return ret;
177}
178
179void ext4_kvfree(void *ptr)
180{
181 if (is_vmalloc_addr(ptr))
182 vfree(ptr);
183 else
184 kfree(ptr);
185
186}
187
8fadc143
AR		 188ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
189 struct ext4_group_desc *bg)
bd81d8ee 190{
3a14589c 191 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 192 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 193 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 194}
195
8fadc143
AR		 196ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
197 struct ext4_group_desc *bg)
bd81d8ee 198{
5272f837 199 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 200 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 201 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 202}
203
8fadc143
AR		 204ext4_fsblk_t ext4_inode_table(struct super_block *sb,
205 struct ext4_group_desc *bg)
bd81d8ee 206{
5272f837 207 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 208 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 209 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 210}
211
021b65bb
TT		 212__u32 ext4_free_group_clusters(struct super_block *sb,
213 struct ext4_group_desc *bg)
560671a0
AK		 214{
215 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
216 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 217 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 218}
219
220__u32 ext4_free_inodes_count(struct super_block *sb,
221 struct ext4_group_desc *bg)
222{
223 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
224 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 225 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 226}
227
228__u32 ext4_used_dirs_count(struct super_block *sb,
229 struct ext4_group_desc *bg)
230{
231 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
232 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 233 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 234}
235
236__u32 ext4_itable_unused_count(struct super_block *sb,
237 struct ext4_group_desc *bg)
238{
239 return le16_to_cpu(bg->bg_itable_unused_lo) |
240 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 241 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 242}
243
8fadc143
AR		 244void ext4_block_bitmap_set(struct super_block *sb,
245 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 246{
3a14589c 247 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 248 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
249 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 250}
251
8fadc143
AR		 252void ext4_inode_bitmap_set(struct super_block *sb,
253 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 254{
5272f837 255 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 256 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
257 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 258}
259
8fadc143
AR		 260void ext4_inode_table_set(struct super_block *sb,
261 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 262{
5272f837 263 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 264 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
265 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 266}
267
021b65bb
TT		 268void ext4_free_group_clusters_set(struct super_block *sb,
269 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 270{
271 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
272 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
273 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
274}
275
276void ext4_free_inodes_set(struct super_block *sb,
277 struct ext4_group_desc *bg, __u32 count)
278{
279 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
280 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
281 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
282}
283
284void ext4_used_dirs_set(struct super_block *sb,
285 struct ext4_group_desc *bg, __u32 count)
286{
287 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
288 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
289 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
290}
291
292void ext4_itable_unused_set(struct super_block *sb,
293 struct ext4_group_desc *bg, __u32 count)
294{
295 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
296 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
297 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
298}
299
d3d1faf6 300
1c13d5c0
TT		 301static void __save_error_info(struct super_block *sb, const char *func,
302 unsigned int line)
303{
304 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
305
306 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
307 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
308 es->s_last_error_time = cpu_to_le32(get_seconds());
309 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
310 es->s_last_error_line = cpu_to_le32(line);
311 if (!es->s_first_error_time) {
312 es->s_first_error_time = es->s_last_error_time;
313 strncpy(es->s_first_error_func, func,
314 sizeof(es->s_first_error_func));
315 es->s_first_error_line = cpu_to_le32(line);
316 es->s_first_error_ino = es->s_last_error_ino;
317 es->s_first_error_block = es->s_last_error_block;
318 }
66e61a9e
TT		 319 /*
320 * Start the daily error reporting function if it hasn't been
321 * started already
322 */
323 if (!es->s_error_count)
324 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 325 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 326}
327
328static void save_error_info(struct super_block *sb, const char *func,
329 unsigned int line)
330{
331 __save_error_info(sb, func, line);
332 ext4_commit_super(sb, 1);
333}
334
7c2e7087
TT		 335/*
336 * The del_gendisk() function uninitializes the disk-specific data
337 * structures, including the bdi structure, without telling anyone
338 * else. Once this happens, any attempt to call mark_buffer_dirty()
339 * (for example, by ext4_commit_super), will cause a kernel OOPS.
340 * This is a kludge to prevent these oops until we can put in a proper
341 * hook in del_gendisk() to inform the VFS and file system layers.
342 */
343static int block_device_ejected(struct super_block *sb)
344{
345 struct inode *bd_inode = sb->s_bdev->bd_inode;
346 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
347
348 return bdi->dev == NULL;
349}
350
18aadd47
BJ		 351static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
352{
353 struct super_block *sb = journal->j_private;
354 struct ext4_sb_info *sbi = EXT4_SB(sb);
355 int error = is_journal_aborted(journal);
356 struct ext4_journal_cb_entry *jce, *tmp;
357
358 spin_lock(&sbi->s_md_lock);
359 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
360 list_del_init(&jce->jce_list);
361 spin_unlock(&sbi->s_md_lock);
362 jce->jce_func(sb, jce, error);
363 spin_lock(&sbi->s_md_lock);
364 }
365 spin_unlock(&sbi->s_md_lock);
366}
1c13d5c0 367
ac27a0ec
DK		 368/* Deal with the reporting of failure conditions on a filesystem such as
369 * inconsistencies detected or read IO failures.
370 *
371 * On ext2, we can store the error state of the filesystem in the
617ba13b 372 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 373 * write ordering constraints on the superblock which prevent us from
374 * writing it out straight away; and given that the journal is about to
375 * be aborted, we can't rely on the current, or future, transactions to
376 * write out the superblock safely.
377 *
dab291af 378 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 379 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 380 * that error until we've noted it down and cleared it.
381 */
382
617ba13b 383static void ext4_handle_error(struct super_block *sb)
ac27a0ec 384{
ac27a0ec
DK		 385 if (sb->s_flags & MS_RDONLY)
386 return;
387
2b2d6d01 388 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 389 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 390
4ab2f15b 391 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 392 if (journal)
dab291af 393 jbd2_journal_abort(journal, -EIO);
ac27a0ec 394 }
2b2d6d01 395 if (test_opt(sb, ERRORS_RO)) {
b31e1552 396 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 397 sb->s_flags |= MS_RDONLY;
398 }
ac27a0ec 399 if (test_opt(sb, ERRORS_PANIC))
617ba13b 400 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 401 sb->s_id);
402}
403
12062ddd 404void __ext4_error(struct super_block *sb, const char *function,
c398eda0 405 unsigned int line, const char *fmt, ...)
ac27a0ec 406{
0ff2ea7d 407 struct va_format vaf;
ac27a0ec
DK		 408 va_list args;
409
410 va_start(args, fmt);
0ff2ea7d
JP		 411 vaf.fmt = fmt;
412 vaf.va = &args;
413 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
414 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 415 va_end(args);
f3fc0210 416 save_error_info(sb, function, line);
ac27a0ec 417
617ba13b 418 ext4_handle_error(sb);
ac27a0ec
DK		 419}
420
c398eda0
TT		 421void ext4_error_inode(struct inode *inode, const char *function,
422 unsigned int line, ext4_fsblk_t block,
273df556
FM		 423 const char *fmt, ...)
424{
425 va_list args;
f7c21177 426 struct va_format vaf;
1c13d5c0 427 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 428
1c13d5c0
TT		 429 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
430 es->s_last_error_block = cpu_to_le64(block);
431 save_error_info(inode->i_sb, function, line);
273df556 432 va_start(args, fmt);
f7c21177
TT		 433 vaf.fmt = fmt;
434 vaf.va = &args;
c398eda0 435 if (block)
d9ee81da
JP		 436 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
437 "inode #%lu: block %llu: comm %s: %pV\n",
438 inode->i_sb->s_id, function, line, inode->i_ino,
439 block, current->comm, &vaf);
440 else
441 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
442 "inode #%lu: comm %s: %pV\n",
443 inode->i_sb->s_id, function, line, inode->i_ino,
444 current->comm, &vaf);
273df556
FM		 445 va_end(args);
446
447 ext4_handle_error(inode->i_sb);
448}
449
c398eda0 450void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 451 unsigned int line, ext4_fsblk_t block,
452 const char *fmt, ...)
273df556
FM		 453{
454 va_list args;
f7c21177 455 struct va_format vaf;
1c13d5c0 456 struct ext4_super_block *es;
496ad9aa 457 struct inode *inode = file_inode(file);
273df556
FM		 458 char pathname[80], *path;
459
1c13d5c0
TT		 460 es = EXT4_SB(inode->i_sb)->s_es;
461 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
462 save_error_info(inode->i_sb, function, line);
273df556 463 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 464 if (IS_ERR(path))
273df556 465 path = "(unknown)";
f7c21177
TT		 466 va_start(args, fmt);
467 vaf.fmt = fmt;
468 vaf.va = &args;
d9ee81da
JP		 469 if (block)
470 printk(KERN_CRIT
471 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
472 "block %llu: comm %s: path %s: %pV\n",
473 inode->i_sb->s_id, function, line, inode->i_ino,
474 block, current->comm, path, &vaf);
475 else
476 printk(KERN_CRIT
477 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
478 "comm %s: path %s: %pV\n",
479 inode->i_sb->s_id, function, line, inode->i_ino,
480 current->comm, path, &vaf);
273df556
FM		 481 va_end(args);
482
483 ext4_handle_error(inode->i_sb);
484}
485
722887dd
TT		 486const char *ext4_decode_error(struct super_block *sb, int errno,
487 char nbuf[16])
ac27a0ec
DK		 488{
489 char *errstr = NULL;
490
491 switch (errno) {
492 case -EIO:
493 errstr = "IO failure";
494 break;
495 case -ENOMEM:
496 errstr = "Out of memory";
497 break;
498 case -EROFS:
78f1ddbb
TT		 499 if (!sb || (EXT4_SB(sb)->s_journal &&
500 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 501 errstr = "Journal has aborted";
502 else
503 errstr = "Readonly filesystem";
504 break;
505 default:
506 /* If the caller passed in an extra buffer for unknown
507 * errors, textualise them now. Else we just return
508 * NULL. */
509 if (nbuf) {
510 /* Check for truncated error codes... */
511 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
512 errstr = nbuf;
513 }
514 break;
515 }
516
517 return errstr;
518}
519
617ba13b 520/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 521 * automatically and invokes the appropriate error response. */
522
c398eda0
TT		 523void __ext4_std_error(struct super_block *sb, const char *function,
524 unsigned int line, int errno)
ac27a0ec
DK		 525{
526 char nbuf[16];
527 const char *errstr;
528
529 /* Special case: if the error is EROFS, and we're not already
530 * inside a transaction, then there's really no point in logging
531 * an error. */
532 if (errno == -EROFS && journal_current_handle() == NULL &&
533 (sb->s_flags & MS_RDONLY))
534 return;
535
617ba13b 536 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 537 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
538 sb->s_id, function, line, errstr);
1c13d5c0 539 save_error_info(sb, function, line);
ac27a0ec 540
617ba13b 541 ext4_handle_error(sb);
ac27a0ec
DK		 542}
543
544/*
617ba13b 545 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 546 * abort function may be used to deal with unrecoverable failures such
547 * as journal IO errors or ENOMEM at a critical moment in log management.
548 *
549 * We unconditionally force the filesystem into an ABORT|READONLY state,
550 * unless the error response on the fs has been set to panic in which
551 * case we take the easy way out and panic immediately.
552 */
553
c67d859e 554void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 555 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 556{
557 va_list args;
558
1c13d5c0 559 save_error_info(sb, function, line);
ac27a0ec 560 va_start(args, fmt);
c398eda0
TT		 561 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
562 function, line);
ac27a0ec
DK		 563 vprintk(fmt, args);
564 printk("\n");
565 va_end(args);
566
1c13d5c0
TT		 567 if ((sb->s_flags & MS_RDONLY) == 0) {
568 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
569 sb->s_flags |= MS_RDONLY;
570 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
571 if (EXT4_SB(sb)->s_journal)
572 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
573 save_error_info(sb, function, line);
574 }
ac27a0ec 575 if (test_opt(sb, ERRORS_PANIC))
617ba13b 576 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 577}
578
0ff2ea7d 579void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 580{
0ff2ea7d 581 struct va_format vaf;
b31e1552
ES		 582 va_list args;
583
584 va_start(args, fmt);
0ff2ea7d
JP		 585 vaf.fmt = fmt;
586 vaf.va = &args;
587 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 588 va_end(args);
589}
590
12062ddd 591void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 592 unsigned int line, const char *fmt, ...)
ac27a0ec 593{
0ff2ea7d 594 struct va_format vaf;
ac27a0ec
DK		 595 va_list args;
596
597 va_start(args, fmt);
0ff2ea7d
JP		 598 vaf.fmt = fmt;
599 vaf.va = &args;
600 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
601 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 602 va_end(args);
603}
604
e29136f8
TT		 605void __ext4_grp_locked_error(const char *function, unsigned int line,
606 struct super_block *sb, ext4_group_t grp,
607 unsigned long ino, ext4_fsblk_t block,
608 const char *fmt, ...)
5d1b1b3f
AK		 609__releases(bitlock)
610__acquires(bitlock)
611{
0ff2ea7d 612 struct va_format vaf;
5d1b1b3f
AK		 613 va_list args;
614 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
615
1c13d5c0
TT		 616 es->s_last_error_ino = cpu_to_le32(ino);
617 es->s_last_error_block = cpu_to_le64(block);
618 __save_error_info(sb, function, line);
0ff2ea7d 619
5d1b1b3f 620 va_start(args, fmt);
0ff2ea7d
JP		 621
622 vaf.fmt = fmt;
623 vaf.va = &args;
21149d61 624 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 625 sb->s_id, function, line, grp);
626 if (ino)
0ff2ea7d 627 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 628 if (block)
0ff2ea7d
JP		 629 printk(KERN_CONT "block %llu:", (unsigned long long) block);
630 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 631 va_end(args);
632
633 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 634 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 635 return;
636 }
1c13d5c0 637
5d1b1b3f
AK		 638 ext4_unlock_group(sb, grp);
639 ext4_handle_error(sb);
640 /*
641 * We only get here in the ERRORS_RO case; relocking the group
642 * may be dangerous, but nothing bad will happen since the
643 * filesystem will have already been marked read/only and the
644 * journal has been aborted. We return 1 as a hint to callers
645 * who might what to use the return value from
25985edc 646 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 647 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
648 * aggressively from the ext4 function in question, with a
649 * more appropriate error code.
650 */
651 ext4_lock_group(sb, grp);
652 return;
653}
654
617ba13b 655void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 656{
617ba13b 657 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 658
617ba13b 659 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 660 return;
661
12062ddd 662 ext4_warning(sb,
ac27a0ec
DK		 663 "updating to rev %d because of new feature flag, "
664 "running e2fsck is recommended",
617ba13b 665 EXT4_DYNAMIC_REV);
ac27a0ec 666
617ba13b
MC		 667 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
668 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
669 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 670 /* leave es->s_feature_*compat flags alone */
671 /* es->s_uuid will be set by e2fsck if empty */
672
673 /*
674 * The rest of the superblock fields should be zero, and if not it
675 * means they are likely already in use, so leave them alone. We
676 * can leave it up to e2fsck to clean up any inconsistencies there.
677 */
678}
679
680/*
681 * Open the external journal device
682 */
b31e1552 683static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 684{
685 struct block_device *bdev;
686 char b[BDEVNAME_SIZE];
687
d4d77629 688 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 689 if (IS_ERR(bdev))
690 goto fail;
691 return bdev;
692
693fail:
b31e1552 694 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 695 __bdevname(dev, b), PTR_ERR(bdev));
696 return NULL;
697}
698
699/*
700 * Release the journal device
701 */
617ba13b 702static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 703{
e525fd89 704 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 705}
706
617ba13b 707static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 708{
709 struct block_device *bdev;
710 int ret = -ENODEV;
711
712 bdev = sbi->journal_bdev;
713 if (bdev) {
617ba13b 714 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 715 sbi->journal_bdev = NULL;
716 }
717 return ret;
718}
719
720static inline struct inode *orphan_list_entry(struct list_head *l)
721{
617ba13b 722 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 723}
724
617ba13b 725static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 726{
727 struct list_head *l;
728
b31e1552
ES		 729 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
730 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 731
732 printk(KERN_ERR "sb_info orphan list:\n");
733 list_for_each(l, &sbi->s_orphan) {
734 struct inode *inode = orphan_list_entry(l);
735 printk(KERN_ERR " "
736 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
737 inode->i_sb->s_id, inode->i_ino, inode,
738 inode->i_mode, inode->i_nlink,
739 NEXT_ORPHAN(inode));
740 }
741}
742
2b2d6d01 743static void ext4_put_super(struct super_block *sb)
ac27a0ec 744{
617ba13b
MC		 745 struct ext4_sb_info *sbi = EXT4_SB(sb);
746 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 747 int i, err;
ac27a0ec 748
857ac889 749 ext4_unregister_li_request(sb);
e0ccfd95
CH		 750 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
751
4c0425ff
MC		 752 flush_workqueue(sbi->dio_unwritten_wq);
753 destroy_workqueue(sbi->dio_unwritten_wq);
754
0390131b
FM		 755 if (sbi->s_journal) {
756 err = jbd2_journal_destroy(sbi->s_journal);
757 sbi->s_journal = NULL;
758 if (err < 0)
c67d859e 759 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 760 }
d4edac31 761
74cd15cd 762 ext4_es_unregister_shrinker(sb);
a1c6c569 763 del_timer(&sbi->s_err_report);
d4edac31
JB		 764 ext4_release_system_zone(sb);
765 ext4_mb_release(sb);
766 ext4_ext_release(sb);
767 ext4_xattr_put_super(sb);
768
ac27a0ec 769 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 770 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 771 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 772 }
58c5873a 773 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 774 ext4_commit_super(sb, 1);
775
240799cd 776 if (sbi->s_proc) {
66acdcf4 777 remove_proc_entry("options", sbi->s_proc);
9f6200bb 778 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 779 }
3197ebdb 780 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 781
782 for (i = 0; i < sbi->s_gdb_count; i++)
783 brelse(sbi->s_group_desc[i]);
f18a5f21 784 ext4_kvfree(sbi->s_group_desc);
9933fc0a 785 ext4_kvfree(sbi->s_flex_groups);
57042651 786 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 787 percpu_counter_destroy(&sbi->s_freeinodes_counter);
788 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 789 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 790 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
ac27a0ec
DK		 791 brelse(sbi->s_sbh);
792#ifdef CONFIG_QUOTA
793 for (i = 0; i < MAXQUOTAS; i++)
794 kfree(sbi->s_qf_names[i]);
795#endif
796
797 /* Debugging code just in case the in-memory inode orphan list
798 * isn't empty. The on-disk one can be non-empty if we've
799 * detected an error and taken the fs readonly, but the
800 * in-memory list had better be clean by this point. */
801 if (!list_empty(&sbi->s_orphan))
802 dump_orphan_list(sb, sbi);
803 J_ASSERT(list_empty(&sbi->s_orphan));
804
f98393a6 805 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 806 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
807 /*
808 * Invalidate the journal device's buffers. We don't want them
809 * floating about in memory - the physical journal device may
810 * hotswapped, and it breaks the `ro-after' testing code.
811 */
812 sync_blockdev(sbi->journal_bdev);
f98393a6 813 invalidate_bdev(sbi->journal_bdev);
617ba13b 814 ext4_blkdev_remove(sbi);
ac27a0ec 815 }
c5e06d10
JL		 816 if (sbi->s_mmp_tsk)
817 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 818 sb->s_fs_info = NULL;
3197ebdb
TT		 819 /*
820 * Now that we are completely done shutting down the
821 * superblock, we need to actually destroy the kobject.
822 */
3197ebdb
TT		 823 kobject_put(&sbi->s_kobj);
824 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 825 if (sbi->s_chksum_driver)
826 crypto_free_shash(sbi->s_chksum_driver);
705895b6 827 kfree(sbi->s_blockgroup_lock);
ac27a0ec 828 kfree(sbi);
ac27a0ec
DK		 829}
830
e18b890b 831static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 832
833/*
834 * Called inside transaction, so use GFP_NOFS
835 */
617ba13b 836static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 837{
617ba13b 838 struct ext4_inode_info *ei;
ac27a0ec 839
e6b4f8da 840 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 841 if (!ei)
842 return NULL;
0b8e58a1 843
ac27a0ec 844 ei->vfs_inode.i_version = 1;
c9de560d
AT		 845 INIT_LIST_HEAD(&ei->i_prealloc_list);
846 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 847 ext4_es_init_tree(&ei->i_es_tree);
848 rwlock_init(&ei->i_es_lock);
74cd15cd
ZL		 849 INIT_LIST_HEAD(&ei->i_es_lru);
850 ei->i_es_lru_nr = 0;
d2a17637
MC		 851 ei->i_reserved_data_blocks = 0;
852 ei->i_reserved_meta_blocks = 0;
853 ei->i_allocated_meta_blocks = 0;
9d0be502 854 ei->i_da_metadata_calc_len = 0;
7e731bc9 855 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 856 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 857#ifdef CONFIG_QUOTA
858 ei->i_reserved_quota = 0;
859#endif
8aefcd55 860 ei->jinode = NULL;
c7064ef1 861 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 862 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 863 ei->i_sync_tid = 0;
864 ei->i_datasync_tid = 0;
f7ad6d2e 865 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 866 atomic_set(&ei->i_unwritten, 0);
84c17543 867 INIT_WORK(&ei->i_unwritten_work, ext4_end_io_work);
0b8e58a1 868
ac27a0ec
DK		 869 return &ei->vfs_inode;
870}
871
7ff9c073
TT		 872static int ext4_drop_inode(struct inode *inode)
873{
874 int drop = generic_drop_inode(inode);
875
876 trace_ext4_drop_inode(inode, drop);
877 return drop;
878}
879
fa0d7e3d
NP		 880static void ext4_i_callback(struct rcu_head *head)
881{
882 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 883 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
884}
885
617ba13b 886static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 887{
9f7dd93d 888 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 889 ext4_msg(inode->i_sb, KERN_ERR,
890 "Inode %lu (%p): orphan list check failed!",
891 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 892 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
893 EXT4_I(inode), sizeof(struct ext4_inode_info),
894 true);
895 dump_stack();
896 }
fa0d7e3d 897 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 898}
899
51cc5068 900static void init_once(void *foo)
ac27a0ec 901{
617ba13b 902 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 903
a35afb83 904 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 905 init_rwsem(&ei->xattr_sem);
0e855ac8 906 init_rwsem(&ei->i_data_sem);
a35afb83 907 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 908}
909
910static int init_inodecache(void)
911{
617ba13b
MC		 912 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
913 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 914 0, (SLAB_RECLAIM_ACCOUNT|
915 SLAB_MEM_SPREAD),
20c2df83 916 init_once);
617ba13b 917 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 918 return -ENOMEM;
919 return 0;
920}
921
922static void destroy_inodecache(void)
923{
8c0a8537
KS		 924 /*
925 * Make sure all delayed rcu free inodes are flushed before we
926 * destroy cache.
927 */
928 rcu_barrier();
617ba13b 929 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 930}
931
0930fcc1 932void ext4_clear_inode(struct inode *inode)
ac27a0ec 933{
0930fcc1 934 invalidate_inode_buffers(inode);
dbd5768f 935 clear_inode(inode);
9f754758 936 dquot_drop(inode);
c2ea3fde 937 ext4_discard_preallocations(inode);
51865fda 938 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
74cd15cd 939 ext4_es_lru_del(inode);
8aefcd55
TT		 940 if (EXT4_I(inode)->jinode) {
941 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
942 EXT4_I(inode)->jinode);
943 jbd2_free_inode(EXT4_I(inode)->jinode);
944 EXT4_I(inode)->jinode = NULL;
945 }
ac27a0ec
DK		 946}
947
1b961ac0 948static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 949 u64 ino, u32 generation)
ac27a0ec 950{
ac27a0ec 951 struct inode *inode;
ac27a0ec 952
617ba13b 953 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 954 return ERR_PTR(-ESTALE);
617ba13b 955 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 956 return ERR_PTR(-ESTALE);
957
958 /* iget isn't really right if the inode is currently unallocated!!
959 *
617ba13b 960 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 961 * deleted, so we should be safe.
962 *
963 * Currently we don't know the generation for parent directory, so
964 * a generation of 0 means "accept any"
965 */
1d1fe1ee
DH		 966 inode = ext4_iget(sb, ino);
967 if (IS_ERR(inode))
968 return ERR_CAST(inode);
969 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 970 iput(inode);
971 return ERR_PTR(-ESTALE);
972 }
1b961ac0
CH		 973
974 return inode;
975}
976
977static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 978 int fh_len, int fh_type)
1b961ac0
CH		 979{
980 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
981 ext4_nfs_get_inode);
982}
983
984static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 985 int fh_len, int fh_type)
1b961ac0
CH		 986{
987 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
988 ext4_nfs_get_inode);
ac27a0ec
DK		 989}
990
c39a7f84
TO		 991/*
992 * Try to release metadata pages (indirect blocks, directories) which are
993 * mapped via the block device. Since these pages could have journal heads
994 * which would prevent try_to_free_buffers() from freeing them, we must use
995 * jbd2 layer's try_to_free_buffers() function to release them.
996 */
0b8e58a1
AD		 997static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
998 gfp_t wait)
c39a7f84
TO		 999{
1000 journal_t *journal = EXT4_SB(sb)->s_journal;
1001
1002 WARN_ON(PageChecked(page));
1003 if (!page_has_buffers(page))
1004 return 0;
1005 if (journal)
1006 return jbd2_journal_try_to_free_buffers(journal, page,
1007 wait & ~__GFP_WAIT);
1008 return try_to_free_buffers(page);
1009}
1010
ac27a0ec 1011#ifdef CONFIG_QUOTA
af5bc92d 1012#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1013#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1014
617ba13b
MC		 1015static int ext4_write_dquot(struct dquot *dquot);
1016static int ext4_acquire_dquot(struct dquot *dquot);
1017static int ext4_release_dquot(struct dquot *dquot);
1018static int ext4_mark_dquot_dirty(struct dquot *dquot);
1019static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1020static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1021 struct path *path);
7c319d32
AK		 1022static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1023 int format_id);
ca0e05e4 1024static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1025static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1026static int ext4_quota_on_mount(struct super_block *sb, int type);
1027static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1028 size_t len, loff_t off);
617ba13b 1029static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1030 const char *data, size_t len, loff_t off);
7c319d32
AK		 1031static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1032 unsigned int flags);
1033static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1034
61e225dc 1035static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1036 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1037 .write_dquot = ext4_write_dquot,
1038 .acquire_dquot = ext4_acquire_dquot,
1039 .release_dquot = ext4_release_dquot,
1040 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1041 .write_info = ext4_write_info,
1042 .alloc_dquot = dquot_alloc,
1043 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1044};
1045
0d54b217 1046static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1047 .quota_on = ext4_quota_on,
ca0e05e4 1048 .quota_off = ext4_quota_off,
287a8095
CH		 1049 .quota_sync = dquot_quota_sync,
1050 .get_info = dquot_get_dqinfo,
1051 .set_info = dquot_set_dqinfo,
1052 .get_dqblk = dquot_get_dqblk,
1053 .set_dqblk = dquot_set_dqblk
ac27a0ec 1054};
7c319d32
AK		 1055
1056static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1057 .quota_on_meta = ext4_quota_on_sysfile,
1058 .quota_off = ext4_quota_off_sysfile,
1059 .quota_sync = dquot_quota_sync,
1060 .get_info = dquot_get_dqinfo,
1061 .set_info = dquot_set_dqinfo,
1062 .get_dqblk = dquot_get_dqblk,
1063 .set_dqblk = dquot_set_dqblk
1064};
ac27a0ec
DK		 1065#endif
1066
ee9b6d61 1067static const struct super_operations ext4_sops = {
617ba13b
MC		 1068 .alloc_inode = ext4_alloc_inode,
1069 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1070 .write_inode = ext4_write_inode,
1071 .dirty_inode = ext4_dirty_inode,
7ff9c073 1072 .drop_inode = ext4_drop_inode,
0930fcc1 1073 .evict_inode = ext4_evict_inode,
617ba13b 1074 .put_super = ext4_put_super,
617ba13b 1075 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1076 .freeze_fs = ext4_freeze,
1077 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1078 .statfs = ext4_statfs,
1079 .remount_fs = ext4_remount,
617ba13b 1080 .show_options = ext4_show_options,
ac27a0ec 1081#ifdef CONFIG_QUOTA
617ba13b
MC		 1082 .quota_read = ext4_quota_read,
1083 .quota_write = ext4_quota_write,
ac27a0ec 1084#endif
c39a7f84 1085 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1086};
1087
9ca92389
TT		 1088static const struct super_operations ext4_nojournal_sops = {
1089 .alloc_inode = ext4_alloc_inode,
1090 .destroy_inode = ext4_destroy_inode,
1091 .write_inode = ext4_write_inode,
1092 .dirty_inode = ext4_dirty_inode,
7ff9c073 1093 .drop_inode = ext4_drop_inode,
0930fcc1 1094 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1095 .put_super = ext4_put_super,
1096 .statfs = ext4_statfs,
1097 .remount_fs = ext4_remount,
9ca92389
TT		 1098 .show_options = ext4_show_options,
1099#ifdef CONFIG_QUOTA
1100 .quota_read = ext4_quota_read,
1101 .quota_write = ext4_quota_write,
1102#endif
1103 .bdev_try_to_free_page = bdev_try_to_free_page,
1104};
1105
39655164 1106static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1107 .fh_to_dentry = ext4_fh_to_dentry,
1108 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1109 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1110};
1111
1112enum {
1113 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1114 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1115 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1116 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1117 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1118 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1119 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1120 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1121 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1122 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1123 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1124 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1125 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1126 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1127 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1128 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1129 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1130 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1131 Opt_max_dir_size_kb,
ac27a0ec
DK		 1132};
1133
a447c093 1134static const match_table_t tokens = {
ac27a0ec
DK		 1135 {Opt_bsd_df, "bsddf"},
1136 {Opt_minix_df, "minixdf"},
1137 {Opt_grpid, "grpid"},
1138 {Opt_grpid, "bsdgroups"},
1139 {Opt_nogrpid, "nogrpid"},
1140 {Opt_nogrpid, "sysvgroups"},
1141 {Opt_resgid, "resgid=%u"},
1142 {Opt_resuid, "resuid=%u"},
1143 {Opt_sb, "sb=%u"},
1144 {Opt_err_cont, "errors=continue"},
1145 {Opt_err_panic, "errors=panic"},
1146 {Opt_err_ro, "errors=remount-ro"},
1147 {Opt_nouid32, "nouid32"},
ac27a0ec 1148 {Opt_debug, "debug"},
72578c33
TT		 1149 {Opt_removed, "oldalloc"},
1150 {Opt_removed, "orlov"},
ac27a0ec
DK		 1151 {Opt_user_xattr, "user_xattr"},
1152 {Opt_nouser_xattr, "nouser_xattr"},
1153 {Opt_acl, "acl"},
1154 {Opt_noacl, "noacl"},
e3bb52ae 1155 {Opt_noload, "norecovery"},
5a916be1 1156 {Opt_noload, "noload"},
72578c33
TT		 1157 {Opt_removed, "nobh"},
1158 {Opt_removed, "bh"},
ac27a0ec 1159 {Opt_commit, "commit=%u"},
30773840
TT		 1160 {Opt_min_batch_time, "min_batch_time=%u"},
1161 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1162 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1163 {Opt_journal_checksum, "journal_checksum"},
1164 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1165 {Opt_abort, "abort"},
1166 {Opt_data_journal, "data=journal"},
1167 {Opt_data_ordered, "data=ordered"},
1168 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1169 {Opt_data_err_abort, "data_err=abort"},
1170 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1171 {Opt_offusrjquota, "usrjquota="},
1172 {Opt_usrjquota, "usrjquota=%s"},
1173 {Opt_offgrpjquota, "grpjquota="},
1174 {Opt_grpjquota, "grpjquota=%s"},
1175 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1176 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1177 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1178 {Opt_grpquota, "grpquota"},
1179 {Opt_noquota, "noquota"},
1180 {Opt_quota, "quota"},
1181 {Opt_usrquota, "usrquota"},
1182 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1183 {Opt_barrier, "barrier"},
1184 {Opt_nobarrier, "nobarrier"},
25ec56b5 1185 {Opt_i_version, "i_version"},
c9de560d 1186 {Opt_stripe, "stripe=%u"},
64769240 1187 {Opt_delalloc, "delalloc"},
dd919b98 1188 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1189 {Opt_removed, "mblk_io_submit"},
1190 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1191 {Opt_block_validity, "block_validity"},
1192 {Opt_noblock_validity, "noblock_validity"},
240799cd 1193 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1194 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1195 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1196 {Opt_auto_da_alloc, "auto_da_alloc"},
1197 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1198 {Opt_dioread_nolock, "dioread_nolock"},
1199 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1200 {Opt_discard, "discard"},
1201 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1202 {Opt_init_itable, "init_itable=%u"},
1203 {Opt_init_itable, "init_itable"},
1204 {Opt_noinit_itable, "noinit_itable"},
df981d03 1205 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1206 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1207 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1208 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1209 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1210 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1211 {Opt_err, NULL},
ac27a0ec
DK		 1212};
1213
617ba13b 1214static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1215{
617ba13b 1216 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1217 char *options = (char *) *data;
1218
1219 if (!options || strncmp(options, "sb=", 3) != 0)
1220 return 1; /* Default location */
0b8e58a1 1221
ac27a0ec 1222 options += 3;
0b8e58a1 1223 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1224 sb_block = simple_strtoul(options, &options, 0);
1225 if (*options && *options != ',') {
4776004f 1226 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1227 (char *) *data);
1228 return 1;
1229 }
1230 if (*options == ',')
1231 options++;
1232 *data = (void *) options;
0b8e58a1 1233
ac27a0ec
DK		 1234 return sb_block;
1235}
1236
b3881f74 1237#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1238static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1239 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1240
56c50f11
DM		 1241#ifdef CONFIG_QUOTA
1242static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1243{
1244 struct ext4_sb_info *sbi = EXT4_SB(sb);
1245 char *qname;
03dafb5f 1246 int ret = -1;
56c50f11
DM		 1247
1248 if (sb_any_quota_loaded(sb) &&
1249 !sbi->s_qf_names[qtype]) {
1250 ext4_msg(sb, KERN_ERR,
1251 "Cannot change journaled "
1252 "quota options when quota turned on");
57f73c2c 1253 return -1;
56c50f11 1254 }
262b4662
JK		 1255 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1256 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1257 "when QUOTA feature is enabled");
1258 return -1;
1259 }
56c50f11
DM		 1260 qname = match_strdup(args);
1261 if (!qname) {
1262 ext4_msg(sb, KERN_ERR,
1263 "Not enough memory for storing quotafile name");
57f73c2c 1264 return -1;
56c50f11 1265 }
03dafb5f
CG		 1266 if (sbi->s_qf_names[qtype]) {
1267 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1268 ret = 1;
1269 else
1270 ext4_msg(sb, KERN_ERR,
1271 "%s quota file already specified",
1272 QTYPE2NAME(qtype));
1273 goto errout;
56c50f11 1274 }
03dafb5f 1275 if (strchr(qname, '/')) {
56c50f11
DM		 1276 ext4_msg(sb, KERN_ERR,
1277 "quotafile must be on filesystem root");
03dafb5f 1278 goto errout;
56c50f11 1279 }
03dafb5f 1280 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1281 set_opt(sb, QUOTA);
56c50f11 1282 return 1;
03dafb5f
CG		 1283errout:
1284 kfree(qname);
1285 return ret;
56c50f11
DM		 1286}
1287
1288static int clear_qf_name(struct super_block *sb, int qtype)
1289{
1290
1291 struct ext4_sb_info *sbi = EXT4_SB(sb);
1292
1293 if (sb_any_quota_loaded(sb) &&
1294 sbi->s_qf_names[qtype]) {
1295 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1296 " when quota turned on");
57f73c2c 1297 return -1;
56c50f11 1298 }
03dafb5f 1299 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1300 sbi->s_qf_names[qtype] = NULL;
1301 return 1;
1302}
1303#endif
1304
26092bf5
TT		 1305#define MOPT_SET 0x0001
1306#define MOPT_CLEAR 0x0002
1307#define MOPT_NOSUPPORT 0x0004
1308#define MOPT_EXPLICIT 0x0008
1309#define MOPT_CLEAR_ERR 0x0010
1310#define MOPT_GTE0 0x0020
ac27a0ec 1311#ifdef CONFIG_QUOTA
26092bf5
TT		 1312#define MOPT_Q 0
1313#define MOPT_QFMT 0x0040
1314#else
1315#define MOPT_Q MOPT_NOSUPPORT
1316#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1317#endif
26092bf5 1318#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1319#define MOPT_NO_EXT2 0x0100
1320#define MOPT_NO_EXT3 0x0200
1321#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
26092bf5
TT		 1322
1323static const struct mount_opts {
1324 int token;
1325 int mount_opt;
1326 int flags;
1327} ext4_mount_opts[] = {
1328 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1329 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1330 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1331 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1332 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1333 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1334 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1335 MOPT_EXT4_ONLY | MOPT_SET},
1336 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1337 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1338 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1339 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1340 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1341 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1342 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1343 MOPT_EXT4_ONLY | MOPT_CLEAR | MOPT_EXPLICIT},
1344 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1345 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1346 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1347 EXT4_MOUNT_JOURNAL_CHECKSUM),
1348 MOPT_EXT4_ONLY | MOPT_SET},
1349 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1350 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1351 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1352 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1353 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1354 MOPT_NO_EXT2 | MOPT_SET},
1355 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1356 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1357 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1358 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1359 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1360 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1361 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1362 {Opt_commit, 0, MOPT_GTE0},
1363 {Opt_max_batch_time, 0, MOPT_GTE0},
1364 {Opt_min_batch_time, 0, MOPT_GTE0},
1365 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1366 {Opt_init_itable, 0, MOPT_GTE0},
1367 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1368 {Opt_resuid, 0, MOPT_GTE0},
1369 {Opt_resgid, 0, MOPT_GTE0},
1370 {Opt_journal_dev, 0, MOPT_GTE0},
1371 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1372 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1373 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1374 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1375 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1376 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1377 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1378#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1379 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1380 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1381#else
26092bf5
TT		 1382 {Opt_acl, 0, MOPT_NOSUPPORT},
1383 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1384#endif
26092bf5
TT		 1385 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1386 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1387 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1388 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1389 MOPT_SET | MOPT_Q},
1390 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1391 MOPT_SET | MOPT_Q},
1392 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1393 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1394 {Opt_usrjquota, 0, MOPT_Q},
1395 {Opt_grpjquota, 0, MOPT_Q},
1396 {Opt_offusrjquota, 0, MOPT_Q},
1397 {Opt_offgrpjquota, 0, MOPT_Q},
1398 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1399 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1400 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1401 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1402 {Opt_err, 0, 0}
1403};
1404
1405static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1406 substring_t *args, unsigned long *journal_devnum,
1407 unsigned int *journal_ioprio, int is_remount)
1408{
1409 struct ext4_sb_info *sbi = EXT4_SB(sb);
1410 const struct mount_opts *m;
08cefc7a
EB		 1411 kuid_t uid;
1412 kgid_t gid;
26092bf5
TT		 1413 int arg = 0;
1414
57f73c2c
TT		 1415#ifdef CONFIG_QUOTA
1416 if (token == Opt_usrjquota)
1417 return set_qf_name(sb, USRQUOTA, &args[0]);
1418 else if (token == Opt_grpjquota)
1419 return set_qf_name(sb, GRPQUOTA, &args[0]);
1420 else if (token == Opt_offusrjquota)
1421 return clear_qf_name(sb, USRQUOTA);
1422 else if (token == Opt_offgrpjquota)
1423 return clear_qf_name(sb, GRPQUOTA);
1424#endif
26092bf5 1425 switch (token) {
f7048605
TT		 1426 case Opt_noacl:
1427 case Opt_nouser_xattr:
1428 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1429 break;
26092bf5
TT		 1430 case Opt_sb:
1431 return 1; /* handled by get_sb_block() */
1432 case Opt_removed:
5f3633e3 1433 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1434 return 1;
26092bf5
TT		 1435 case Opt_abort:
1436 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1437 return 1;
1438 case Opt_i_version:
1439 sb->s_flags |= MS_I_VERSION;
1440 return 1;
26092bf5
TT		 1441 }
1442
5f3633e3
JK		 1443 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1444 if (token == m->token)
1445 break;
1446
1447 if (m->token == Opt_err) {
1448 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1449 "or missing value", opt);
1450 return -1;
1451 }
1452
8dc0aa8c
TT		 1453 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1454 ext4_msg(sb, KERN_ERR,
1455 "Mount option \"%s\" incompatible with ext2", opt);
1456 return -1;
1457 }
1458 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1459 ext4_msg(sb, KERN_ERR,
1460 "Mount option \"%s\" incompatible with ext3", opt);
1461 return -1;
1462 }
1463
5f3633e3
JK		 1464 if (args->from && match_int(args, &arg))
1465 return -1;
1466 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1467 return -1;
1468 if (m->flags & MOPT_EXPLICIT)
1469 set_opt2(sb, EXPLICIT_DELALLOC);
1470 if (m->flags & MOPT_CLEAR_ERR)
1471 clear_opt(sb, ERRORS_MASK);
1472 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1473 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1474 "options when quota turned on");
1475 return -1;
1476 }
1477
1478 if (m->flags & MOPT_NOSUPPORT) {
1479 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1480 } else if (token == Opt_commit) {
1481 if (arg == 0)
1482 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1483 sbi->s_commit_interval = HZ * arg;
1484 } else if (token == Opt_max_batch_time) {
1485 if (arg == 0)
1486 arg = EXT4_DEF_MAX_BATCH_TIME;
1487 sbi->s_max_batch_time = arg;
1488 } else if (token == Opt_min_batch_time) {
1489 sbi->s_min_batch_time = arg;
1490 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1491 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1492 ext4_msg(sb, KERN_ERR,
1493 "EXT4-fs: inode_readahead_blks must be "
1494 "0 or a power of 2 smaller than 2^31");
26092bf5 1495 return -1;
5f3633e3
JK		 1496 }
1497 sbi->s_inode_readahead_blks = arg;
1498 } else if (token == Opt_init_itable) {
1499 set_opt(sb, INIT_INODE_TABLE);
1500 if (!args->from)
1501 arg = EXT4_DEF_LI_WAIT_MULT;
1502 sbi->s_li_wait_mult = arg;
1503 } else if (token == Opt_max_dir_size_kb) {
1504 sbi->s_max_dir_size_kb = arg;
1505 } else if (token == Opt_stripe) {
1506 sbi->s_stripe = arg;
1507 } else if (token == Opt_resuid) {
1508 uid = make_kuid(current_user_ns(), arg);
1509 if (!uid_valid(uid)) {
1510 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1511 return -1;
1512 }
5f3633e3
JK		 1513 sbi->s_resuid = uid;
1514 } else if (token == Opt_resgid) {
1515 gid = make_kgid(current_user_ns(), arg);
1516 if (!gid_valid(gid)) {
1517 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1518 return -1;
1519 }
1520 sbi->s_resgid = gid;
1521 } else if (token == Opt_journal_dev) {
1522 if (is_remount) {
1523 ext4_msg(sb, KERN_ERR,
1524 "Cannot specify journal on remount");
1525 return -1;
1526 }
1527 *journal_devnum = arg;
1528 } else if (token == Opt_journal_ioprio) {
1529 if (arg > 7) {
1530 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1531 " (must be 0-7)");
1532 return -1;
1533 }
1534 *journal_ioprio =
1535 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1536 } else if (m->flags & MOPT_DATAJ) {
1537 if (is_remount) {
1538 if (!sbi->s_journal)
1539 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1540 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1541 ext4_msg(sb, KERN_ERR,
26092bf5 1542 "Cannot change data mode on remount");
26092bf5 1543 return -1;
ac27a0ec 1544 }
26092bf5 1545 } else {
5f3633e3
JK		 1546 clear_opt(sb, DATA_FLAGS);
1547 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1548 }
5f3633e3
JK		 1549#ifdef CONFIG_QUOTA
1550 } else if (m->flags & MOPT_QFMT) {
1551 if (sb_any_quota_loaded(sb) &&
1552 sbi->s_jquota_fmt != m->mount_opt) {
1553 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1554 "quota options when quota turned on");
1555 return -1;
1556 }
262b4662
JK		 1557 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1558 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1559 ext4_msg(sb, KERN_ERR,
1560 "Cannot set journaled quota options "
1561 "when QUOTA feature is enabled");
1562 return -1;
1563 }
5f3633e3
JK		 1564 sbi->s_jquota_fmt = m->mount_opt;
1565#endif
1566 } else {
1567 if (!args->from)
1568 arg = 1;
1569 if (m->flags & MOPT_CLEAR)
1570 arg = !arg;
1571 else if (unlikely(!(m->flags & MOPT_SET))) {
1572 ext4_msg(sb, KERN_WARNING,
1573 "buggy handling of option %s", opt);
1574 WARN_ON(1);
1575 return -1;
1576 }
1577 if (arg != 0)
1578 sbi->s_mount_opt |= m->mount_opt;
1579 else
1580 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1581 }
5f3633e3 1582 return 1;
26092bf5
TT		 1583}
1584
1585static int parse_options(char *options, struct super_block *sb,
1586 unsigned long *journal_devnum,
1587 unsigned int *journal_ioprio,
1588 int is_remount)
1589{
1590 struct ext4_sb_info *sbi = EXT4_SB(sb);
1591 char *p;
1592 substring_t args[MAX_OPT_ARGS];
1593 int token;
1594
1595 if (!options)
1596 return 1;
1597
1598 while ((p = strsep(&options, ",")) != NULL) {
1599 if (!*p)
1600 continue;
1601 /*
1602 * Initialize args struct so we know whether arg was
1603 * found; some options take optional arguments.
1604 */
caecd0af 1605 args[0].to = args[0].from = NULL;
26092bf5
TT		 1606 token = match_token(p, tokens, args);
1607 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1608 journal_ioprio, is_remount) < 0)
1609 return 0;
ac27a0ec
DK		 1610 }
1611#ifdef CONFIG_QUOTA
262b4662
JK		 1612 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1613 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1614 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1615 "feature is enabled");
1616 return 0;
1617 }
ac27a0ec 1618 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1619 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1620 clear_opt(sb, USRQUOTA);
ac27a0ec 1621
482a7425 1622 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1623 clear_opt(sb, GRPQUOTA);
ac27a0ec 1624
56c50f11 1625 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1626 ext4_msg(sb, KERN_ERR, "old and new quota "
1627 "format mixing");
ac27a0ec
DK		 1628 return 0;
1629 }
1630
1631 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1632 ext4_msg(sb, KERN_ERR, "journaled quota format "
1633 "not specified");
ac27a0ec
DK		 1634 return 0;
1635 }
1636 } else {
1637 if (sbi->s_jquota_fmt) {
b31e1552 1638 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1639 "specified with no journaling "
b31e1552 1640 "enabled");
ac27a0ec
DK		 1641 return 0;
1642 }
1643 }
1644#endif
261cb20c
JK		 1645 if (test_opt(sb, DIOREAD_NOLOCK)) {
1646 int blocksize =
1647 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1648
1649 if (blocksize < PAGE_CACHE_SIZE) {
1650 ext4_msg(sb, KERN_ERR, "can't mount with "
1651 "dioread_nolock if block size != PAGE_SIZE");
1652 return 0;
1653 }
1654 }
ac27a0ec
DK		 1655 return 1;
1656}
1657
2adf6da8
TT		 1658static inline void ext4_show_quota_options(struct seq_file *seq,
1659 struct super_block *sb)
1660{
1661#if defined(CONFIG_QUOTA)
1662 struct ext4_sb_info *sbi = EXT4_SB(sb);
1663
1664 if (sbi->s_jquota_fmt) {
1665 char *fmtname = "";
1666
1667 switch (sbi->s_jquota_fmt) {
1668 case QFMT_VFS_OLD:
1669 fmtname = "vfsold";
1670 break;
1671 case QFMT_VFS_V0:
1672 fmtname = "vfsv0";
1673 break;
1674 case QFMT_VFS_V1:
1675 fmtname = "vfsv1";
1676 break;
1677 }
1678 seq_printf(seq, ",jqfmt=%s", fmtname);
1679 }
1680
1681 if (sbi->s_qf_names[USRQUOTA])
1682 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1683
1684 if (sbi->s_qf_names[GRPQUOTA])
1685 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1686
1687 if (test_opt(sb, USRQUOTA))
1688 seq_puts(seq, ",usrquota");
1689
1690 if (test_opt(sb, GRPQUOTA))
1691 seq_puts(seq, ",grpquota");
1692#endif
1693}
1694
5a916be1
TT		 1695static const char *token2str(int token)
1696{
50df9fd5 1697 const struct match_token *t;
5a916be1
TT		 1698
1699 for (t = tokens; t->token != Opt_err; t++)
1700 if (t->token == token && !strchr(t->pattern, '='))
1701 break;
1702 return t->pattern;
1703}
1704
2adf6da8
TT		 1705/*
1706 * Show an option if
1707 * - it's set to a non-default value OR
1708 * - if the per-sb default is different from the global default
1709 */
66acdcf4
TT		 1710static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1711 int nodefs)
2adf6da8 1712{
2adf6da8
TT		 1713 struct ext4_sb_info *sbi = EXT4_SB(sb);
1714 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1715 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1716 const struct mount_opts *m;
66acdcf4 1717 char sep = nodefs ? '\n' : ',';
2adf6da8 1718
66acdcf4
TT		 1719#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1720#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1721
1722 if (sbi->s_sb_block != 1)
5a916be1
TT		 1723 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1724
1725 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1726 int want_set = m->flags & MOPT_SET;
1727 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1728 (m->flags & MOPT_CLEAR_ERR))
1729 continue;
66acdcf4 1730 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1731 continue; /* skip if same as the default */
1732 if ((want_set &&
1733 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1734 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1735 continue; /* select Opt_noFoo vs Opt_Foo */
1736 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1737 }
5a916be1 1738
08cefc7a 1739 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1740 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1741 SEQ_OPTS_PRINT("resuid=%u",
1742 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1743 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1744 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1745 SEQ_OPTS_PRINT("resgid=%u",
1746 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1747 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1748 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1749 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1750 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1751 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1752 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1753 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1754 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1755 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1756 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1757 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1758 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1759 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1760 if (sb->s_flags & MS_I_VERSION)
5a916be1 1761 SEQ_OPTS_PUTS("i_version");
66acdcf4 1762 if (nodefs || sbi->s_stripe)
5a916be1 1763 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1764 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1765 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1766 SEQ_OPTS_PUTS("data=journal");
1767 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1768 SEQ_OPTS_PUTS("data=ordered");
1769 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1770 SEQ_OPTS_PUTS("data=writeback");
1771 }
66acdcf4
TT		 1772 if (nodefs ||
1773 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1774 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1775 sbi->s_inode_readahead_blks);
2adf6da8 1776
66acdcf4
TT		 1777 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1778 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1779 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1780 if (nodefs || sbi->s_max_dir_size_kb)
1781 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1782
1783 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1784 return 0;
1785}
1786
66acdcf4
TT		 1787static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1788{
1789 return _ext4_show_options(seq, root->d_sb, 0);
1790}
1791
1792static int options_seq_show(struct seq_file *seq, void *offset)
1793{
1794 struct super_block *sb = seq->private;
1795 int rc;
1796
1797 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1798 rc = _ext4_show_options(seq, sb, 1);
1799 seq_puts(seq, "\n");
1800 return rc;
1801}
1802
1803static int options_open_fs(struct inode *inode, struct file *file)
1804{
1805 return single_open(file, options_seq_show, PDE(inode)->data);
1806}
1807
1808static const struct file_operations ext4_seq_options_fops = {
1809 .owner = THIS_MODULE,
1810 .open = options_open_fs,
1811 .read = seq_read,
1812 .llseek = seq_lseek,
1813 .release = single_release,
1814};
1815
617ba13b 1816static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1817 int read_only)
1818{
617ba13b 1819 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1820 int res = 0;
1821
617ba13b 1822 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1823 ext4_msg(sb, KERN_ERR, "revision level too high, "
1824 "forcing read-only mode");
ac27a0ec
DK		 1825 res = MS_RDONLY;
1826 }
1827 if (read_only)
281b5995 1828 goto done;
617ba13b 1829 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1830 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1831 "running e2fsck is recommended");
617ba13b 1832 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1833 ext4_msg(sb, KERN_WARNING,
1834 "warning: mounting fs with errors, "
1835 "running e2fsck is recommended");
ed3ce80a 1836 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1837 le16_to_cpu(es->s_mnt_count) >=
1838 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1839 ext4_msg(sb, KERN_WARNING,
1840 "warning: maximal mount count reached, "
1841 "running e2fsck is recommended");
ac27a0ec
DK		 1842 else if (le32_to_cpu(es->s_checkinterval) &&
1843 (le32_to_cpu(es->s_lastcheck) +
1844 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1845 ext4_msg(sb, KERN_WARNING,
1846 "warning: checktime reached, "
1847 "running e2fsck is recommended");
0b8e58a1 1848 if (!sbi->s_journal)
0390131b 1849 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1850 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1851 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1852 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1853 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1854 ext4_update_dynamic_rev(sb);
0390131b
FM		 1855 if (sbi->s_journal)
1856 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1857
e2d67052 1858 ext4_commit_super(sb, 1);
281b5995 1859done:
ac27a0ec 1860 if (test_opt(sb, DEBUG))
a9df9a49 1861 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1862 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1863 sb->s_blocksize,
1864 sbi->s_groups_count,
617ba13b
MC		 1865 EXT4_BLOCKS_PER_GROUP(sb),
1866 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1867 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1868
7abc52c2 1869 cleancache_init_fs(sb);
ac27a0ec
DK		 1870 return res;
1871}
1872
117fff10
TT		 1873int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1874{
1875 struct ext4_sb_info *sbi = EXT4_SB(sb);
1876 struct flex_groups *new_groups;
1877 int size;
1878
1879 if (!sbi->s_log_groups_per_flex)
1880 return 0;
1881
1882 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1883 if (size <= sbi->s_flex_groups_allocated)
1884 return 0;
1885
1886 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1887 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1888 if (!new_groups) {
1889 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1890 size / (int) sizeof(struct flex_groups));
1891 return -ENOMEM;
1892 }
1893
1894 if (sbi->s_flex_groups) {
1895 memcpy(new_groups, sbi->s_flex_groups,
1896 (sbi->s_flex_groups_allocated *
1897 sizeof(struct flex_groups)));
1898 ext4_kvfree(sbi->s_flex_groups);
1899 }
1900 sbi->s_flex_groups = new_groups;
1901 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1902 return 0;
1903}
1904
772cb7c8
JS		 1905static int ext4_fill_flex_info(struct super_block *sb)
1906{
1907 struct ext4_sb_info *sbi = EXT4_SB(sb);
1908 struct ext4_group_desc *gdp = NULL;
772cb7c8 1909 ext4_group_t flex_group;
d50f2ab6 1910 unsigned int groups_per_flex = 0;
117fff10 1911 int i, err;
772cb7c8 1912
503358ae 1913 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1914 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1915 sbi->s_log_groups_per_flex = 0;
1916 return 1;
1917 }
76495ec1 1918 groups_per_flex = 1U << sbi->s_log_groups_per_flex;
772cb7c8 1919
117fff10
TT		 1920 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1921 if (err)
9933fc0a 1922 goto failed;
772cb7c8 1923
772cb7c8 1924 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1925 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1926
1927 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1928 atomic_add(ext4_free_inodes_count(sb, gdp),
1929 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1930 atomic64_add(ext4_free_group_clusters(sb, gdp),
1931 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1932 atomic_add(ext4_used_dirs_count(sb, gdp),
1933 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1934 }
1935
1936 return 1;
1937failed:
1938 return 0;
1939}
1940
feb0ab32
DW		 1941static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1942 struct ext4_group_desc *gdp)
717d50e4 1943{
feb0ab32 1944 int offset;
717d50e4 1945 __u16 crc = 0;
feb0ab32 1946 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1947
feb0ab32
DW		 1948 if ((sbi->s_es->s_feature_ro_compat &
1949 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1950 /* Use new metadata_csum algorithm */
1951 __u16 old_csum;
1952 __u32 csum32;
1953
1954 old_csum = gdp->bg_checksum;
1955 gdp->bg_checksum = 0;
1956 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1957 sizeof(le_group));
1958 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1959 sbi->s_desc_size);
1960 gdp->bg_checksum = old_csum;
1961
1962 crc = csum32 & 0xFFFF;
1963 goto out;
717d50e4
AD		 1964 }
1965
feb0ab32
DW		 1966 /* old crc16 code */
1967 offset = offsetof(struct ext4_group_desc, bg_checksum);
1968
1969 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1970 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1971 crc = crc16(crc, (__u8 *)gdp, offset);
1972 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1973 /* for checksum of struct ext4_group_desc do the rest...*/
1974 if ((sbi->s_es->s_feature_incompat &
1975 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1976 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1977 crc = crc16(crc, (__u8 *)gdp + offset,
1978 le16_to_cpu(sbi->s_es->s_desc_size) -
1979 offset);
1980
1981out:
717d50e4
AD		 1982 return cpu_to_le16(crc);
1983}
1984
feb0ab32 1985int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 1986 struct ext4_group_desc *gdp)
1987{
feb0ab32
DW		 1988 if (ext4_has_group_desc_csum(sb) &&
1989 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
1990 block_group, gdp)))
717d50e4
AD		 1991 return 0;
1992
1993 return 1;
1994}
1995
feb0ab32
DW		 1996void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
1997 struct ext4_group_desc *gdp)
1998{
1999 if (!ext4_has_group_desc_csum(sb))
2000 return;
2001 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2002}
2003
ac27a0ec 2004/* Called at mount-time, super-block is locked */
bfff6873
LC		 2005static int ext4_check_descriptors(struct super_block *sb,
2006 ext4_group_t *first_not_zeroed)
ac27a0ec 2007{
617ba13b
MC		 2008 struct ext4_sb_info *sbi = EXT4_SB(sb);
2009 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2010 ext4_fsblk_t last_block;
bd81d8ee
LV		 2011 ext4_fsblk_t block_bitmap;
2012 ext4_fsblk_t inode_bitmap;
2013 ext4_fsblk_t inode_table;
ce421581 2014 int flexbg_flag = 0;
bfff6873 2015 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2016
ce421581
JS		 2017 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2018 flexbg_flag = 1;
2019
af5bc92d 2020 ext4_debug("Checking group descriptors");
ac27a0ec 2021
197cd65a
AM		 2022 for (i = 0; i < sbi->s_groups_count; i++) {
2023 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2024
ce421581 2025 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2026 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2027 else
2028 last_block = first_block +
617ba13b 2029 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2030
bfff6873
LC		 2031 if ((grp == sbi->s_groups_count) &&
2032 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2033 grp = i;
2034
8fadc143 2035 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2036 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2037 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2038 "Block bitmap for group %u not in group "
b31e1552 2039 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2040 return 0;
2041 }
8fadc143 2042 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2043 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2044 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2045 "Inode bitmap for group %u not in group "
b31e1552 2046 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2047 return 0;
2048 }
8fadc143 2049 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2050 if (inode_table < first_block ||
2b2d6d01 2051 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2052 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2053 "Inode table for group %u not in group "
b31e1552 2054 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2055 return 0;
2056 }
955ce5f5 2057 ext4_lock_group(sb, i);
feb0ab32 2058 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2059 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2060 "Checksum for group %u failed (%u!=%u)",
2061 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2062 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2063 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2064 ext4_unlock_group(sb, i);
8a266467 2065 return 0;
7ee1ec4c 2066 }
717d50e4 2067 }
955ce5f5 2068 ext4_unlock_group(sb, i);
ce421581
JS		 2069 if (!flexbg_flag)
2070 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2071 }
bfff6873
LC		 2072 if (NULL != first_not_zeroed)
2073 *first_not_zeroed = grp;
ac27a0ec 2074
5dee5437
TT		 2075 ext4_free_blocks_count_set(sbi->s_es,
2076 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2077 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2078 return 1;
2079}
2080
617ba13b 2081/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2082 * the superblock) which were deleted from all directories, but held open by
2083 * a process at the time of a crash. We walk the list and try to delete these
2084 * inodes at recovery time (only with a read-write filesystem).
2085 *
2086 * In order to keep the orphan inode chain consistent during traversal (in
2087 * case of crash during recovery), we link each inode into the superblock
2088 * orphan list_head and handle it the same way as an inode deletion during
2089 * normal operation (which journals the operations for us).
2090 *
2091 * We only do an iget() and an iput() on each inode, which is very safe if we
2092 * accidentally point at an in-use or already deleted inode. The worst that
2093 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2094 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2095 * e2fsck was run on this filesystem, and it must have already done the orphan
2096 * inode cleanup for us, so we can safely abort without any further action.
2097 */
2b2d6d01
TT		 2098static void ext4_orphan_cleanup(struct super_block *sb,
2099 struct ext4_super_block *es)
ac27a0ec
DK		 2100{
2101 unsigned int s_flags = sb->s_flags;
2102 int nr_orphans = 0, nr_truncates = 0;
2103#ifdef CONFIG_QUOTA
2104 int i;
2105#endif
2106 if (!es->s_last_orphan) {
2107 jbd_debug(4, "no orphan inodes to clean up\n");
2108 return;
2109 }
2110
a8f48a95 2111 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2112 ext4_msg(sb, KERN_ERR, "write access "
2113 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2114 return;
2115 }
2116
d39195c3
AG		 2117 /* Check if feature set would not allow a r/w mount */
2118 if (!ext4_feature_set_ok(sb, 0)) {
2119 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2120 "unknown ROCOMPAT features");
2121 return;
2122 }
2123
617ba13b 2124 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2125 /* don't clear list on RO mount w/ errors */
2126 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
ac27a0ec
DK		 2127 jbd_debug(1, "Errors on filesystem, "
2128 "clearing orphan list.\n");
c25f9bc6
ES		 2129 es->s_last_orphan = 0;
2130 }
ac27a0ec
DK		 2131 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2132 return;
2133 }
2134
2135 if (s_flags & MS_RDONLY) {
b31e1552 2136 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2137 sb->s_flags &= ~MS_RDONLY;
2138 }
2139#ifdef CONFIG_QUOTA
2140 /* Needed for iput() to work correctly and not trash data */
2141 sb->s_flags |= MS_ACTIVE;
2142 /* Turn on quotas so that they are updated correctly */
2143 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2144 if (EXT4_SB(sb)->s_qf_names[i]) {
2145 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2146 if (ret < 0)
b31e1552
ES		 2147 ext4_msg(sb, KERN_ERR,
2148 "Cannot turn on journaled "
2149 "quota: error %d", ret);
ac27a0ec
DK		 2150 }
2151 }
2152#endif
2153
2154 while (es->s_last_orphan) {
2155 struct inode *inode;
2156
97bd42b9
JB		 2157 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2158 if (IS_ERR(inode)) {
ac27a0ec
DK		 2159 es->s_last_orphan = 0;
2160 break;
2161 }
2162
617ba13b 2163 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2164 dquot_initialize(inode);
ac27a0ec 2165 if (inode->i_nlink) {
b31e1552
ES		 2166 ext4_msg(sb, KERN_DEBUG,
2167 "%s: truncating inode %lu to %lld bytes",
46e665e9 2168 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2169 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2170 inode->i_ino, inode->i_size);
721e3eba 2171 mutex_lock(&inode->i_mutex);
617ba13b 2172 ext4_truncate(inode);
721e3eba 2173 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2174 nr_truncates++;
2175 } else {
b31e1552
ES		 2176 ext4_msg(sb, KERN_DEBUG,
2177 "%s: deleting unreferenced inode %lu",
46e665e9 2178 __func__, inode->i_ino);
ac27a0ec
DK		 2179 jbd_debug(2, "deleting unreferenced inode %lu\n",
2180 inode->i_ino);
2181 nr_orphans++;
2182 }
2183 iput(inode); /* The delete magic happens here! */
2184 }
2185
2b2d6d01 2186#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2187
2188 if (nr_orphans)
b31e1552
ES		 2189 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2190 PLURAL(nr_orphans));
ac27a0ec 2191 if (nr_truncates)
b31e1552
ES		 2192 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2193 PLURAL(nr_truncates));
ac27a0ec
DK		 2194#ifdef CONFIG_QUOTA
2195 /* Turn quotas off */
2196 for (i = 0; i < MAXQUOTAS; i++) {
2197 if (sb_dqopt(sb)->files[i])
287a8095 2198 dquot_quota_off(sb, i);
ac27a0ec
DK		 2199 }
2200#endif
2201 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2202}
0b8e58a1 2203
cd2291a4
ES		 2204/*
2205 * Maximal extent format file size.
2206 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2207 * extent format containers, within a sector_t, and within i_blocks
2208 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2209 * so that won't be a limiting factor.
2210 *
f17722f9
LC		 2211 * However there is other limiting factor. We do store extents in the form
2212 * of starting block and length, hence the resulting length of the extent
2213 * covering maximum file size must fit into on-disk format containers as
2214 * well. Given that length is always by 1 unit bigger than max unit (because
2215 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2216 *
cd2291a4
ES		 2217 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2218 */
f287a1a5 2219static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2220{
2221 loff_t res;
2222 loff_t upper_limit = MAX_LFS_FILESIZE;
2223
2224 /* small i_blocks in vfs inode? */
f287a1a5 2225 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2226 /*
90c699a9 2227 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2228 * i_block represent total blocks in 512 bytes
2229 * 32 == size of vfs inode i_blocks * 8
2230 */
2231 upper_limit = (1LL << 32) - 1;
2232
2233 /* total blocks in file system block size */
2234 upper_limit >>= (blkbits - 9);
2235 upper_limit <<= blkbits;
2236 }
2237
f17722f9
LC		 2238 /*
2239 * 32-bit extent-start container, ee_block. We lower the maxbytes
2240 * by one fs block, so ee_len can cover the extent of maximum file
2241 * size
2242 */
2243 res = (1LL << 32) - 1;
cd2291a4 2244 res <<= blkbits;
cd2291a4
ES		 2245
2246 /* Sanity check against vm- & vfs- imposed limits */
2247 if (res > upper_limit)
2248 res = upper_limit;
2249
2250 return res;
2251}
ac27a0ec 2252
ac27a0ec 2253/*
cd2291a4 2254 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2255 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2256 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2257 */
f287a1a5 2258static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2259{
617ba13b 2260 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2261 int meta_blocks;
2262 loff_t upper_limit;
0b8e58a1
AD		 2263 /* This is calculated to be the largest file size for a dense, block
2264 * mapped file such that the file's total number of 512-byte sectors,
2265 * including data and all indirect blocks, does not exceed (2^48 - 1).
2266 *
2267 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2268 * number of 512-byte sectors of the file.
0fc1b451
AK		 2269 */
2270
f287a1a5 2271 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2272 /*
90c699a9 2273 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2274 * the inode i_block field represents total file blocks in
2275 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2276 */
2277 upper_limit = (1LL << 32) - 1;
2278
2279 /* total blocks in file system block size */
2280 upper_limit >>= (bits - 9);
2281
2282 } else {
8180a562
AK		 2283 /*
2284 * We use 48 bit ext4_inode i_blocks
2285 * With EXT4_HUGE_FILE_FL set the i_blocks
2286 * represent total number of blocks in
2287 * file system block size
2288 */
0fc1b451
AK		 2289 upper_limit = (1LL << 48) - 1;
2290
0fc1b451
AK		 2291 }
2292
2293 /* indirect blocks */
2294 meta_blocks = 1;
2295 /* double indirect blocks */
2296 meta_blocks += 1 + (1LL << (bits-2));
2297 /* tripple indirect blocks */
2298 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2299
2300 upper_limit -= meta_blocks;
2301 upper_limit <<= bits;
ac27a0ec
DK		 2302
2303 res += 1LL << (bits-2);
2304 res += 1LL << (2*(bits-2));
2305 res += 1LL << (3*(bits-2));
2306 res <<= bits;
2307 if (res > upper_limit)
2308 res = upper_limit;
0fc1b451
AK		 2309
2310 if (res > MAX_LFS_FILESIZE)
2311 res = MAX_LFS_FILESIZE;
2312
ac27a0ec
DK		 2313 return res;
2314}
2315
617ba13b 2316static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2317 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2318{
617ba13b 2319 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2320 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2321 int has_super = 0;
2322
2323 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2324
617ba13b 2325 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2326 nr < first_meta_bg)
70bbb3e0 2327 return logical_sb_block + nr + 1;
ac27a0ec 2328 bg = sbi->s_desc_per_block * nr;
617ba13b 2329 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2330 has_super = 1;
0b8e58a1 2331
617ba13b 2332 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2333}
2334
c9de560d
AT		 2335/**
2336 * ext4_get_stripe_size: Get the stripe size.
2337 * @sbi: In memory super block info
2338 *
2339 * If we have specified it via mount option, then
2340 * use the mount option value. If the value specified at mount time is
2341 * greater than the blocks per group use the super block value.
2342 * If the super block value is greater than blocks per group return 0.
2343 * Allocator needs it be less than blocks per group.
2344 *
2345 */
2346static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2347{
2348 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2349 unsigned long stripe_width =
2350 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2351 int ret;
c9de560d
AT		 2352
2353 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2354 ret = sbi->s_stripe;
2355 else if (stripe_width <= sbi->s_blocks_per_group)
2356 ret = stripe_width;
2357 else if (stride <= sbi->s_blocks_per_group)
2358 ret = stride;
2359 else
2360 ret = 0;
c9de560d 2361
3eb08658
DE		 2362 /*
2363 * If the stripe width is 1, this makes no sense and
2364 * we set it to 0 to turn off stripe handling code.
2365 */
2366 if (ret <= 1)
2367 ret = 0;
c9de560d 2368
3eb08658 2369 return ret;
c9de560d 2370}
ac27a0ec 2371
3197ebdb
TT		 2372/* sysfs supprt */
2373
2374struct ext4_attr {
2375 struct attribute attr;
2376 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2377 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2378 const char *, size_t);
2379 int offset;
2380};
2381
2382static int parse_strtoul(const char *buf,
2383 unsigned long max, unsigned long *value)
2384{
2385 char *endp;
2386
e7d2860b
AGR		 2387 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2388 endp = skip_spaces(endp);
3197ebdb
TT		 2389 if (*endp || *value > max)
2390 return -EINVAL;
2391
2392 return 0;
2393}
2394
2395static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2396 struct ext4_sb_info *sbi,
2397 char *buf)
2398{
2399 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2400 (s64) EXT4_C2B(sbi,
2401 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2402}
2403
2404static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2405 struct ext4_sb_info *sbi, char *buf)
2406{
2407 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2408
f613dfcb
TT		 2409 if (!sb->s_bdev->bd_part)
2410 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2411 return snprintf(buf, PAGE_SIZE, "%lu\n",
2412 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2413 sbi->s_sectors_written_start) >> 1);
2414}
2415
2416static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2417 struct ext4_sb_info *sbi, char *buf)
2418{
2419 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2420
f613dfcb
TT		 2421 if (!sb->s_bdev->bd_part)
2422 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2423 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2424 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2425 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2426 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2427}
2428
2429static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2430 struct ext4_sb_info *sbi,
2431 const char *buf, size_t count)
2432{
2433 unsigned long t;
2434
2435 if (parse_strtoul(buf, 0x40000000, &t))
2436 return -EINVAL;
2437
5dbd571d 2438 if (t && !is_power_of_2(t))
3197ebdb
TT		 2439 return -EINVAL;
2440
2441 sbi->s_inode_readahead_blks = t;
2442 return count;
2443}
2444
2445static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2446 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2447{
2448 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2449
2450 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2451}
2452
2453static ssize_t sbi_ui_store(struct ext4_attr *a,
2454 struct ext4_sb_info *sbi,
2455 const char *buf, size_t count)
2456{
2457 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2458 unsigned long t;
2459
2460 if (parse_strtoul(buf, 0xffffffff, &t))
2461 return -EINVAL;
2462 *ui = t;
2463 return count;
2464}
2465
2c0544b2
TT		 2466static ssize_t trigger_test_error(struct ext4_attr *a,
2467 struct ext4_sb_info *sbi,
2468 const char *buf, size_t count)
2469{
2470 int len = count;
2471
2472 if (!capable(CAP_SYS_ADMIN))
2473 return -EPERM;
2474
2475 if (len && buf[len-1] == '\n')
2476 len--;
2477
2478 if (len)
2479 ext4_error(sbi->s_sb, "%.*s", len, buf);
2480 return count;
2481}
2482
3197ebdb
TT		 2483#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2484static struct ext4_attr ext4_attr_##_name = { \
2485 .attr = {.name = __stringify(_name), .mode = _mode }, \
2486 .show = _show, \
2487 .store = _store, \
2488 .offset = offsetof(struct ext4_sb_info, _elname), \
2489}
2490#define EXT4_ATTR(name, mode, show, store) \
2491static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2492
857ac889 2493#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2494#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2495#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2496#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2497 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2498#define ATTR_LIST(name) &ext4_attr_##name.attr
2499
2500EXT4_RO_ATTR(delayed_allocation_blocks);
2501EXT4_RO_ATTR(session_write_kbytes);
2502EXT4_RO_ATTR(lifetime_write_kbytes);
2503EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2504 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2505EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2506EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2507EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2508EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2509EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2510EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2511EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2512EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
67a5da56 2513EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2514EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2515
2516static struct attribute *ext4_attrs[] = {
2517 ATTR_LIST(delayed_allocation_blocks),
2518 ATTR_LIST(session_write_kbytes),
2519 ATTR_LIST(lifetime_write_kbytes),
2520 ATTR_LIST(inode_readahead_blks),
11013911 2521 ATTR_LIST(inode_goal),
3197ebdb
TT		 2522 ATTR_LIST(mb_stats),
2523 ATTR_LIST(mb_max_to_scan),
2524 ATTR_LIST(mb_min_to_scan),
2525 ATTR_LIST(mb_order2_req),
2526 ATTR_LIST(mb_stream_req),
2527 ATTR_LIST(mb_group_prealloc),
55138e0b 2528 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2529 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2530 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2531 NULL,
2532};
2533
857ac889
LC		 2534/* Features this copy of ext4 supports */
2535EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2536EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2537EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2538
2539static struct attribute *ext4_feat_attrs[] = {
2540 ATTR_LIST(lazy_itable_init),
27ee40df 2541 ATTR_LIST(batched_discard),
5e7bbef1 2542 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2543 NULL,
2544};
2545
3197ebdb
TT		 2546static ssize_t ext4_attr_show(struct kobject *kobj,
2547 struct attribute *attr, char *buf)
2548{
2549 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2550 s_kobj);
2551 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2552
2553 return a->show ? a->show(a, sbi, buf) : 0;
2554}
2555
2556static ssize_t ext4_attr_store(struct kobject *kobj,
2557 struct attribute *attr,
2558 const char *buf, size_t len)
2559{
2560 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2561 s_kobj);
2562 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2563
2564 return a->store ? a->store(a, sbi, buf, len) : 0;
2565}
2566
2567static void ext4_sb_release(struct kobject *kobj)
2568{
2569 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2570 s_kobj);
2571 complete(&sbi->s_kobj_unregister);
2572}
2573
52cf25d0 2574static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2575 .show = ext4_attr_show,
2576 .store = ext4_attr_store,
2577};
2578
2579static struct kobj_type ext4_ktype = {
2580 .default_attrs = ext4_attrs,
2581 .sysfs_ops = &ext4_attr_ops,
2582 .release = ext4_sb_release,
2583};
2584
857ac889
LC		 2585static void ext4_feat_release(struct kobject *kobj)
2586{
2587 complete(&ext4_feat->f_kobj_unregister);
2588}
2589
2590static struct kobj_type ext4_feat_ktype = {
2591 .default_attrs = ext4_feat_attrs,
2592 .sysfs_ops = &ext4_attr_ops,
2593 .release = ext4_feat_release,
2594};
2595
a13fb1a4
ES		 2596/*
2597 * Check whether this filesystem can be mounted based on
2598 * the features present and the RDONLY/RDWR mount requested.
2599 * Returns 1 if this filesystem can be mounted as requested,
2600 * 0 if it cannot be.
2601 */
2602static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2603{
2604 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2605 ext4_msg(sb, KERN_ERR,
2606 "Couldn't mount because of "
2607 "unsupported optional features (%x)",
2608 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2609 ~EXT4_FEATURE_INCOMPAT_SUPP));
2610 return 0;
2611 }
2612
2613 if (readonly)
2614 return 1;
2615
2616 /* Check that feature set is OK for a read-write mount */
2617 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2618 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2619 "unsupported optional features (%x)",
2620 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2621 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2622 return 0;
2623 }
2624 /*
2625 * Large file size enabled file system can only be mounted
2626 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2627 */
2628 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2629 if (sizeof(blkcnt_t) < sizeof(u64)) {
2630 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2631 "cannot be mounted RDWR without "
2632 "CONFIG_LBDAF");
2633 return 0;
2634 }
2635 }
bab08ab9
TT		 2636 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2637 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2638 ext4_msg(sb, KERN_ERR,
2639 "Can't support bigalloc feature without "
2640 "extents feature\n");
2641 return 0;
2642 }
7c319d32
AK		 2643
2644#ifndef CONFIG_QUOTA
2645 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2646 !readonly) {
2647 ext4_msg(sb, KERN_ERR,
2648 "Filesystem with quota feature cannot be mounted RDWR "
2649 "without CONFIG_QUOTA");
2650 return 0;
2651 }
2652#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2653 return 1;
2654}
2655
66e61a9e
TT		 2656/*
2657 * This function is called once a day if we have errors logged
2658 * on the file system
2659 */
2660static void print_daily_error_info(unsigned long arg)
2661{
2662 struct super_block *sb = (struct super_block *) arg;
2663 struct ext4_sb_info *sbi;
2664 struct ext4_super_block *es;
2665
2666 sbi = EXT4_SB(sb);
2667 es = sbi->s_es;
2668
2669 if (es->s_error_count)
2670 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2671 le32_to_cpu(es->s_error_count));
2672 if (es->s_first_error_time) {
2673 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2674 sb->s_id, le32_to_cpu(es->s_first_error_time),
2675 (int) sizeof(es->s_first_error_func),
2676 es->s_first_error_func,
2677 le32_to_cpu(es->s_first_error_line));
2678 if (es->s_first_error_ino)
2679 printk(": inode %u",
2680 le32_to_cpu(es->s_first_error_ino));
2681 if (es->s_first_error_block)
2682 printk(": block %llu", (unsigned long long)
2683 le64_to_cpu(es->s_first_error_block));
2684 printk("\n");
2685 }
2686 if (es->s_last_error_time) {
2687 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2688 sb->s_id, le32_to_cpu(es->s_last_error_time),
2689 (int) sizeof(es->s_last_error_func),
2690 es->s_last_error_func,
2691 le32_to_cpu(es->s_last_error_line));
2692 if (es->s_last_error_ino)
2693 printk(": inode %u",
2694 le32_to_cpu(es->s_last_error_ino));
2695 if (es->s_last_error_block)
2696 printk(": block %llu", (unsigned long long)
2697 le64_to_cpu(es->s_last_error_block));
2698 printk("\n");
2699 }
2700 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2701}
2702
bfff6873
LC		 2703/* Find next suitable group and run ext4_init_inode_table */
2704static int ext4_run_li_request(struct ext4_li_request *elr)
2705{
2706 struct ext4_group_desc *gdp = NULL;
2707 ext4_group_t group, ngroups;
2708 struct super_block *sb;
2709 unsigned long timeout = 0;
2710 int ret = 0;
2711
2712 sb = elr->lr_super;
2713 ngroups = EXT4_SB(sb)->s_groups_count;
2714
8e8ad8a5 2715 sb_start_write(sb);
bfff6873
LC		 2716 for (group = elr->lr_next_group; group < ngroups; group++) {
2717 gdp = ext4_get_group_desc(sb, group, NULL);
2718 if (!gdp) {
2719 ret = 1;
2720 break;
2721 }
2722
2723 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2724 break;
2725 }
2726
7f511862 2727 if (group >= ngroups)
bfff6873
LC		 2728 ret = 1;
2729
2730 if (!ret) {
2731 timeout = jiffies;
2732 ret = ext4_init_inode_table(sb, group,
2733 elr->lr_timeout ? 0 : 1);
2734 if (elr->lr_timeout == 0) {
51ce6511
LC		 2735 timeout = (jiffies - timeout) *
2736 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2737 elr->lr_timeout = timeout;
2738 }
2739 elr->lr_next_sched = jiffies + elr->lr_timeout;
2740 elr->lr_next_group = group + 1;
2741 }
8e8ad8a5 2742 sb_end_write(sb);
bfff6873
LC		 2743
2744 return ret;
2745}
2746
2747/*
2748 * Remove lr_request from the list_request and free the
4ed5c033 2749 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2750 */
2751static void ext4_remove_li_request(struct ext4_li_request *elr)
2752{
2753 struct ext4_sb_info *sbi;
2754
2755 if (!elr)
2756 return;
2757
2758 sbi = elr->lr_sbi;
2759
2760 list_del(&elr->lr_request);
2761 sbi->s_li_request = NULL;
2762 kfree(elr);
2763}
2764
2765static void ext4_unregister_li_request(struct super_block *sb)
2766{
1bb933fb
LC		 2767 mutex_lock(&ext4_li_mtx);
2768 if (!ext4_li_info) {
2769 mutex_unlock(&ext4_li_mtx);
bfff6873 2770 return;
1bb933fb 2771 }
bfff6873
LC		 2772
2773 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2774 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2775 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2776 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2777}
2778
8f1f7453
ES		 2779static struct task_struct *ext4_lazyinit_task;
2780
bfff6873
LC		 2781/*
2782 * This is the function where ext4lazyinit thread lives. It walks
2783 * through the request list searching for next scheduled filesystem.
2784 * When such a fs is found, run the lazy initialization request
2785 * (ext4_rn_li_request) and keep track of the time spend in this
2786 * function. Based on that time we compute next schedule time of
2787 * the request. When walking through the list is complete, compute
2788 * next waking time and put itself into sleep.
2789 */
2790static int ext4_lazyinit_thread(void *arg)
2791{
2792 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2793 struct list_head *pos, *n;
2794 struct ext4_li_request *elr;
4ed5c033 2795 unsigned long next_wakeup, cur;
bfff6873
LC		 2796
2797 BUG_ON(NULL == eli);
2798
bfff6873
LC		 2799cont_thread:
2800 while (true) {
2801 next_wakeup = MAX_JIFFY_OFFSET;
2802
2803 mutex_lock(&eli->li_list_mtx);
2804 if (list_empty(&eli->li_request_list)) {
2805 mutex_unlock(&eli->li_list_mtx);
2806 goto exit_thread;
2807 }
2808
2809 list_for_each_safe(pos, n, &eli->li_request_list) {
2810 elr = list_entry(pos, struct ext4_li_request,
2811 lr_request);
2812
b2c78cd0
TT		 2813 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2814 if (ext4_run_li_request(elr) != 0) {
2815 /* error, remove the lazy_init job */
2816 ext4_remove_li_request(elr);
2817 continue;
2818 }
bfff6873
LC		 2819 }
2820
2821 if (time_before(elr->lr_next_sched, next_wakeup))
2822 next_wakeup = elr->lr_next_sched;
2823 }
2824 mutex_unlock(&eli->li_list_mtx);
2825
a0acae0e 2826 try_to_freeze();
bfff6873 2827
4ed5c033
LC		 2828 cur = jiffies;
2829 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2830 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2831 cond_resched();
2832 continue;
2833 }
2834
4ed5c033
LC		 2835 schedule_timeout_interruptible(next_wakeup - cur);
2836
8f1f7453
ES		 2837 if (kthread_should_stop()) {
2838 ext4_clear_request_list();
2839 goto exit_thread;
2840 }
bfff6873
LC		 2841 }
2842
2843exit_thread:
2844 /*
2845 * It looks like the request list is empty, but we need
2846 * to check it under the li_list_mtx lock, to prevent any
2847 * additions into it, and of course we should lock ext4_li_mtx
2848 * to atomically free the list and ext4_li_info, because at
2849 * this point another ext4 filesystem could be registering
2850 * new one.
2851 */
2852 mutex_lock(&ext4_li_mtx);
2853 mutex_lock(&eli->li_list_mtx);
2854 if (!list_empty(&eli->li_request_list)) {
2855 mutex_unlock(&eli->li_list_mtx);
2856 mutex_unlock(&ext4_li_mtx);
2857 goto cont_thread;
2858 }
2859 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2860 kfree(ext4_li_info);
2861 ext4_li_info = NULL;
2862 mutex_unlock(&ext4_li_mtx);
2863
2864 return 0;
2865}
2866
2867static void ext4_clear_request_list(void)
2868{
2869 struct list_head *pos, *n;
2870 struct ext4_li_request *elr;
2871
2872 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2873 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2874 elr = list_entry(pos, struct ext4_li_request,
2875 lr_request);
2876 ext4_remove_li_request(elr);
2877 }
2878 mutex_unlock(&ext4_li_info->li_list_mtx);
2879}
2880
2881static int ext4_run_lazyinit_thread(void)
2882{
8f1f7453
ES		 2883 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2884 ext4_li_info, "ext4lazyinit");
2885 if (IS_ERR(ext4_lazyinit_task)) {
2886 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2887 ext4_clear_request_list();
bfff6873
LC		 2888 kfree(ext4_li_info);
2889 ext4_li_info = NULL;
92b97816 2890 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2891 "initialization thread\n",
2892 err);
2893 return err;
2894 }
2895 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2896 return 0;
2897}
2898
2899/*
2900 * Check whether it make sense to run itable init. thread or not.
2901 * If there is at least one uninitialized inode table, return
2902 * corresponding group number, else the loop goes through all
2903 * groups and return total number of groups.
2904 */
2905static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2906{
2907 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2908 struct ext4_group_desc *gdp = NULL;
2909
2910 for (group = 0; group < ngroups; group++) {
2911 gdp = ext4_get_group_desc(sb, group, NULL);
2912 if (!gdp)
2913 continue;
2914
2915 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2916 break;
2917 }
2918
2919 return group;
2920}
2921
2922static int ext4_li_info_new(void)
2923{
2924 struct ext4_lazy_init *eli = NULL;
2925
2926 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2927 if (!eli)
2928 return -ENOMEM;
2929
bfff6873
LC		 2930 INIT_LIST_HEAD(&eli->li_request_list);
2931 mutex_init(&eli->li_list_mtx);
2932
bfff6873
LC		 2933 eli->li_state |= EXT4_LAZYINIT_QUIT;
2934
2935 ext4_li_info = eli;
2936
2937 return 0;
2938}
2939
2940static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2941 ext4_group_t start)
2942{
2943 struct ext4_sb_info *sbi = EXT4_SB(sb);
2944 struct ext4_li_request *elr;
2945 unsigned long rnd;
2946
2947 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2948 if (!elr)
2949 return NULL;
2950
2951 elr->lr_super = sb;
2952 elr->lr_sbi = sbi;
2953 elr->lr_next_group = start;
2954
2955 /*
2956 * Randomize first schedule time of the request to
2957 * spread the inode table initialization requests
2958 * better.
2959 */
2960 get_random_bytes(&rnd, sizeof(rnd));
2961 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2962 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2963
2964 return elr;
2965}
2966
7f511862
TT		 2967int ext4_register_li_request(struct super_block *sb,
2968 ext4_group_t first_not_zeroed)
bfff6873
LC		 2969{
2970 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2971 struct ext4_li_request *elr = NULL;
bfff6873 2972 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2973 int ret = 0;
bfff6873 2974
7f511862 2975 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2976 if (sbi->s_li_request != NULL) {
2977 /*
2978 * Reset timeout so it can be computed again, because
2979 * s_li_wait_mult might have changed.
2980 */
2981 sbi->s_li_request->lr_timeout = 0;
7f511862 2982 goto out;
51ce6511 2983 }
bfff6873
LC		 2984
2985 if (first_not_zeroed == ngroups ||
2986 (sb->s_flags & MS_RDONLY) ||
55ff3840 2987 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2988 goto out;
bfff6873
LC		 2989
2990 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2991 if (!elr) {
2992 ret = -ENOMEM;
2993 goto out;
2994 }
bfff6873
LC		 2995
2996 if (NULL == ext4_li_info) {
2997 ret = ext4_li_info_new();
2998 if (ret)
2999 goto out;
3000 }
3001
3002 mutex_lock(&ext4_li_info->li_list_mtx);
3003 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3004 mutex_unlock(&ext4_li_info->li_list_mtx);
3005
3006 sbi->s_li_request = elr;
46e4690b
TM		 3007 /*
3008 * set elr to NULL here since it has been inserted to
3009 * the request_list and the removal and free of it is
3010 * handled by ext4_clear_request_list from now on.
3011 */
3012 elr = NULL;
bfff6873
LC		 3013
3014 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3015 ret = ext4_run_lazyinit_thread();
3016 if (ret)
3017 goto out;
3018 }
bfff6873 3019out:
beed5ecb
NK		 3020 mutex_unlock(&ext4_li_mtx);
3021 if (ret)
bfff6873 3022 kfree(elr);
bfff6873
LC		 3023 return ret;
3024}
3025
3026/*
3027 * We do not need to lock anything since this is called on
3028 * module unload.
3029 */
3030static void ext4_destroy_lazyinit_thread(void)
3031{
3032 /*
3033 * If thread exited earlier
3034 * there's nothing to be done.
3035 */
8f1f7453 3036 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3037 return;
3038
8f1f7453 3039 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3040}
3041
25ed6e8a
DW		 3042static int set_journal_csum_feature_set(struct super_block *sb)
3043{
3044 int ret = 1;
3045 int compat, incompat;
3046 struct ext4_sb_info *sbi = EXT4_SB(sb);
3047
3048 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3049 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3050 /* journal checksum v2 */
3051 compat = 0;
3052 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3053 } else {
3054 /* journal checksum v1 */
3055 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3056 incompat = 0;
3057 }
3058
3059 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3060 ret = jbd2_journal_set_features(sbi->s_journal,
3061 compat, 0,
3062 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3063 incompat);
3064 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3065 ret = jbd2_journal_set_features(sbi->s_journal,
3066 compat, 0,
3067 incompat);
3068 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3069 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3070 } else {
3071 jbd2_journal_clear_features(sbi->s_journal,
3072 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3073 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3074 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3075 }
3076
3077 return ret;
3078}
3079
952fc18e
TT		 3080/*
3081 * Note: calculating the overhead so we can be compatible with
3082 * historical BSD practice is quite difficult in the face of
3083 * clusters/bigalloc. This is because multiple metadata blocks from
3084 * different block group can end up in the same allocation cluster.
3085 * Calculating the exact overhead in the face of clustered allocation
3086 * requires either O(all block bitmaps) in memory or O(number of block
3087 * groups**2) in time. We will still calculate the superblock for
3088 * older file systems --- and if we come across with a bigalloc file
3089 * system with zero in s_overhead_clusters the estimate will be close to
3090 * correct especially for very large cluster sizes --- but for newer
3091 * file systems, it's better to calculate this figure once at mkfs
3092 * time, and store it in the superblock. If the superblock value is
3093 * present (even for non-bigalloc file systems), we will use it.
3094 */
3095static int count_overhead(struct super_block *sb, ext4_group_t grp,
3096 char *buf)
3097{
3098 struct ext4_sb_info *sbi = EXT4_SB(sb);
3099 struct ext4_group_desc *gdp;
3100 ext4_fsblk_t first_block, last_block, b;
3101 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3102 int s, j, count = 0;
3103
0548bbb8
TT		 3104 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3105 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3106 sbi->s_itb_per_group + 2);
3107
952fc18e
TT		 3108 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3109 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3110 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3111 for (i = 0; i < ngroups; i++) {
3112 gdp = ext4_get_group_desc(sb, i, NULL);
3113 b = ext4_block_bitmap(sb, gdp);
3114 if (b >= first_block && b <= last_block) {
3115 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3116 count++;
3117 }
3118 b = ext4_inode_bitmap(sb, gdp);
3119 if (b >= first_block && b <= last_block) {
3120 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3121 count++;
3122 }
3123 b = ext4_inode_table(sb, gdp);
3124 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3125 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3126 int c = EXT4_B2C(sbi, b - first_block);
3127 ext4_set_bit(c, buf);
3128 count++;
3129 }
3130 if (i != grp)
3131 continue;
3132 s = 0;
3133 if (ext4_bg_has_super(sb, grp)) {
3134 ext4_set_bit(s++, buf);
3135 count++;
3136 }
3137 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3138 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3139 count++;
3140 }
3141 }
3142 if (!count)
3143 return 0;
3144 return EXT4_CLUSTERS_PER_GROUP(sb) -
3145 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3146}
3147
3148/*
3149 * Compute the overhead and stash it in sbi->s_overhead
3150 */
3151int ext4_calculate_overhead(struct super_block *sb)
3152{
3153 struct ext4_sb_info *sbi = EXT4_SB(sb);
3154 struct ext4_super_block *es = sbi->s_es;
3155 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3156 ext4_fsblk_t overhead = 0;
3157 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3158
952fc18e
TT		 3159 if (!buf)
3160 return -ENOMEM;
3161
3162 /*
3163 * Compute the overhead (FS structures). This is constant
3164 * for a given filesystem unless the number of block groups
3165 * changes so we cache the previous value until it does.
3166 */
3167
3168 /*
3169 * All of the blocks before first_data_block are overhead
3170 */
3171 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3172
3173 /*
3174 * Add the overhead found in each block group
3175 */
3176 for (i = 0; i < ngroups; i++) {
3177 int blks;
3178
3179 blks = count_overhead(sb, i, buf);
3180 overhead += blks;
3181 if (blks)
3182 memset(buf, 0, PAGE_SIZE);
3183 cond_resched();
3184 }
0875a2b4
ES		 3185 /* Add the journal blocks as well */
3186 if (sbi->s_journal)
810da240 3187 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3188
952fc18e
TT		 3189 sbi->s_overhead = overhead;
3190 smp_wmb();
3191 free_page((unsigned long) buf);
3192 return 0;
3193}
3194
2b2d6d01 3195static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3196{
d4c402d9 3197 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3198 struct buffer_head *bh;
617ba13b
MC		 3199 struct ext4_super_block *es = NULL;
3200 struct ext4_sb_info *sbi;
3201 ext4_fsblk_t block;
3202 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3203 ext4_fsblk_t logical_sb_block;
ac27a0ec 3204 unsigned long offset = 0;
ac27a0ec
DK		 3205 unsigned long journal_devnum = 0;
3206 unsigned long def_mount_opts;
3207 struct inode *root;
9f6200bb 3208 char *cp;
0390131b 3209 const char *descr;
dcc7dae3 3210 int ret = -ENOMEM;
281b5995 3211 int blocksize, clustersize;
4ec11028
TT		 3212 unsigned int db_count;
3213 unsigned int i;
281b5995 3214 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3215 __u64 blocks_count;
07aa2ea1 3216 int err = 0;
b3881f74 3217 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3218 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3219
3220 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3221 if (!sbi)
dcc7dae3 3222 goto out_free_orig;
705895b6
PE		 3223
3224 sbi->s_blockgroup_lock =
3225 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3226 if (!sbi->s_blockgroup_lock) {
3227 kfree(sbi);
dcc7dae3 3228 goto out_free_orig;
705895b6 3229 }
ac27a0ec 3230 sb->s_fs_info = sbi;
2c0544b2 3231 sbi->s_sb = sb;
240799cd 3232 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3233 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3234 if (sb->s_bdev->bd_part)
3235 sbi->s_sectors_written_start =
3236 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3237
9f6200bb
TT		 3238 /* Cleanup superblock name */
3239 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3240 *cp = '!';
3241
07aa2ea1 3242 /* -EINVAL is default */
dcc7dae3 3243 ret = -EINVAL;
617ba13b 3244 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3245 if (!blocksize) {
b31e1552 3246 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3247 goto out_fail;
3248 }
3249
3250 /*
617ba13b 3251 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3252 * block sizes. We need to calculate the offset from buffer start.
3253 */
617ba13b 3254 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3255 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3256 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3257 } else {
70bbb3e0 3258 logical_sb_block = sb_block;
ac27a0ec
DK		 3259 }
3260
70bbb3e0 3261 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3262 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3263 goto out_fail;
3264 }
3265 /*
3266 * Note: s_es must be initialized as soon as possible because
617ba13b 3267 * some ext4 macro-instructions depend on its value
ac27a0ec 3268 */
2716b802 3269 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3270 sbi->s_es = es;
3271 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3272 if (sb->s_magic != EXT4_SUPER_MAGIC)
3273 goto cantfind_ext4;
afc32f7e 3274 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3275
feb0ab32
DW		 3276 /* Warn if metadata_csum and gdt_csum are both set. */
3277 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3278 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3279 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3280 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3281 "redundant flags; please run fsck.");
3282
d25425f8
DW		 3283 /* Check for a known checksum algorithm */
3284 if (!ext4_verify_csum_type(sb, es)) {
3285 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3286 "unknown checksum algorithm.");
3287 silent = 1;
3288 goto cantfind_ext4;
3289 }
3290
0441984a
DW		 3291 /* Load the checksum driver */
3292 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3293 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3294 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3295 if (IS_ERR(sbi->s_chksum_driver)) {
3296 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3297 ret = PTR_ERR(sbi->s_chksum_driver);
3298 sbi->s_chksum_driver = NULL;
3299 goto failed_mount;
3300 }
3301 }
3302
a9c47317
DW		 3303 /* Check superblock checksum */
3304 if (!ext4_superblock_csum_verify(sb, es)) {
3305 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3306 "invalid superblock checksum. Run e2fsck?");
3307 silent = 1;
3308 goto cantfind_ext4;
3309 }
3310
3311 /* Precompute checksum seed for all metadata */
3312 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3313 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3314 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3315 sizeof(es->s_uuid));
3316
ac27a0ec
DK		 3317 /* Set defaults before we parse the mount options */
3318 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3319 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3320 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3321 set_opt(sb, DEBUG);
87f26807 3322 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3323 set_opt(sb, GRPID);
617ba13b 3324 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3325 set_opt(sb, NO_UID32);
ea663336 3326 /* xattr user namespace & acls are now defaulted on */
ea663336 3327 set_opt(sb, XATTR_USER);
03010a33 3328#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3329 set_opt(sb, POSIX_ACL);
2e7842b8 3330#endif
617ba13b 3331 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3332 set_opt(sb, JOURNAL_DATA);
617ba13b 3333 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3334 set_opt(sb, ORDERED_DATA);
617ba13b 3335 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3336 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3337
3338 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3339 set_opt(sb, ERRORS_PANIC);
bb4f397a 3340 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3341 set_opt(sb, ERRORS_CONT);
bb4f397a 3342 else
fd8c37ec 3343 set_opt(sb, ERRORS_RO);
8b67f04a 3344 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3345 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3346 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3347 set_opt(sb, DISCARD);
ac27a0ec 3348
08cefc7a
EB		 3349 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3350 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3351 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3352 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3353 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3354
8b67f04a 3355 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3356 set_opt(sb, BARRIER);
ac27a0ec 3357
dd919b98
AK		 3358 /*
3359 * enable delayed allocation by default
3360 * Use -o nodelalloc to turn it off
3361 */
bc0b75f7 3362 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3363 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3364 set_opt(sb, DELALLOC);
dd919b98 3365
51ce6511
LC		 3366 /*
3367 * set default s_li_wait_mult for lazyinit, for the case there is
3368 * no mount option specified.
3369 */
3370 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3371
8b67f04a 3372 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3373 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3374 ext4_msg(sb, KERN_WARNING,
3375 "failed to parse options in superblock: %s",
3376 sbi->s_es->s_mount_opts);
3377 }
5a916be1 3378 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3379 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3380 &journal_ioprio, 0))
ac27a0ec
DK		 3381 goto failed_mount;
3382
56889787
TT		 3383 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3384 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3385 "with data=journal disables delayed "
3386 "allocation and O_DIRECT support!\n");
3387 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3388 ext4_msg(sb, KERN_ERR, "can't mount with "
3389 "both data=journal and delalloc");
3390 goto failed_mount;
3391 }
3392 if (test_opt(sb, DIOREAD_NOLOCK)) {
3393 ext4_msg(sb, KERN_ERR, "can't mount with "
3394 "both data=journal and delalloc");
3395 goto failed_mount;
3396 }
3397 if (test_opt(sb, DELALLOC))
3398 clear_opt(sb, DELALLOC);
3399 }
3400
ac27a0ec 3401 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3402 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3403
617ba13b
MC		 3404 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3405 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3406 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3407 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3408 ext4_msg(sb, KERN_WARNING,
3409 "feature flags set on rev 0 fs, "
3410 "running e2fsck is recommended");
469108ff 3411
2035e776
TT		 3412 if (IS_EXT2_SB(sb)) {
3413 if (ext2_feature_set_ok(sb))
3414 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3415 "using the ext4 subsystem");
3416 else {
3417 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3418 "to feature incompatibilities");
3419 goto failed_mount;
3420 }
3421 }
3422
3423 if (IS_EXT3_SB(sb)) {
3424 if (ext3_feature_set_ok(sb))
3425 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3426 "using the ext4 subsystem");
3427 else {
3428 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3429 "to feature incompatibilities");
3430 goto failed_mount;
3431 }
3432 }
3433
ac27a0ec
DK		 3434 /*
3435 * Check feature flags regardless of the revision level, since we
3436 * previously didn't change the revision level when setting the flags,
3437 * so there is a chance incompat flags are set on a rev 0 filesystem.
3438 */
a13fb1a4 3439 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3440 goto failed_mount;
a13fb1a4 3441
261cb20c 3442 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3443 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3444 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3445 ext4_msg(sb, KERN_ERR,
3446 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3447 goto failed_mount;
3448 }
3449
ac27a0ec 3450 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3451 /* Validate the filesystem blocksize */
3452 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3453 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3454 blocksize);
ac27a0ec
DK		 3455 goto failed_mount;
3456 }
3457
2b2d6d01 3458 brelse(bh);
70bbb3e0
AM		 3459 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3460 offset = do_div(logical_sb_block, blocksize);
3461 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3462 if (!bh) {
b31e1552
ES		 3463 ext4_msg(sb, KERN_ERR,
3464 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3465 goto failed_mount;
3466 }
2716b802 3467 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3468 sbi->s_es = es;
617ba13b 3469 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3470 ext4_msg(sb, KERN_ERR,
3471 "Magic mismatch, very weird!");
ac27a0ec
DK		 3472 goto failed_mount;
3473 }
3474 }
3475
a13fb1a4
ES		 3476 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3477 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3478 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3479 has_huge_files);
3480 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3481
617ba13b
MC		 3482 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3483 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3484 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3485 } else {
3486 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3487 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3488 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3489 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3490 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3491 ext4_msg(sb, KERN_ERR,
3492 "unsupported inode size: %d",
2b2d6d01 3493 sbi->s_inode_size);
ac27a0ec
DK		 3494 goto failed_mount;
3495 }
ef7f3835
KS		 3496 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3497 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3498 }
0b8e58a1 3499
0d1ee42f
AR		 3500 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3501 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3502 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3503 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3504 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3505 ext4_msg(sb, KERN_ERR,
3506 "unsupported descriptor size %lu",
0d1ee42f
AR		 3507 sbi->s_desc_size);
3508 goto failed_mount;
3509 }
3510 } else
3511 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3512
ac27a0ec 3513 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3514 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3515 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3516 goto cantfind_ext4;
0b8e58a1 3517
617ba13b 3518 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3519 if (sbi->s_inodes_per_block == 0)
617ba13b 3520 goto cantfind_ext4;
ac27a0ec
DK		 3521 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3522 sbi->s_inodes_per_block;
0d1ee42f 3523 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3524 sbi->s_sbh = bh;
3525 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3526 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3527 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3528
2b2d6d01 3529 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3530 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3531 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3532 i = le32_to_cpu(es->s_flags);
3533 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3534 sbi->s_hash_unsigned = 3;
3535 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3536#ifdef __CHAR_UNSIGNED__
3537 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3538 sbi->s_hash_unsigned = 3;
3539#else
3540 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3541#endif
f99b2589 3542 }
ac27a0ec 3543
281b5995
TT		 3544 /* Handle clustersize */
3545 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3546 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3547 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3548 if (has_bigalloc) {
3549 if (clustersize < blocksize) {
3550 ext4_msg(sb, KERN_ERR,
3551 "cluster size (%d) smaller than "
3552 "block size (%d)", clustersize, blocksize);
3553 goto failed_mount;
3554 }
3555 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3556 le32_to_cpu(es->s_log_block_size);
3557 sbi->s_clusters_per_group =
3558 le32_to_cpu(es->s_clusters_per_group);
3559 if (sbi->s_clusters_per_group > blocksize * 8) {
3560 ext4_msg(sb, KERN_ERR,
3561 "#clusters per group too big: %lu",
3562 sbi->s_clusters_per_group);
3563 goto failed_mount;
3564 }
3565 if (sbi->s_blocks_per_group !=
3566 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3567 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3568 "clusters per group (%lu) inconsistent",
3569 sbi->s_blocks_per_group,
3570 sbi->s_clusters_per_group);
3571 goto failed_mount;
3572 }
3573 } else {
3574 if (clustersize != blocksize) {
3575 ext4_warning(sb, "fragment/cluster size (%d) != "
3576 "block size (%d)", clustersize,
3577 blocksize);
3578 clustersize = blocksize;
3579 }
3580 if (sbi->s_blocks_per_group > blocksize * 8) {
3581 ext4_msg(sb, KERN_ERR,
3582 "#blocks per group too big: %lu",
3583 sbi->s_blocks_per_group);
3584 goto failed_mount;
3585 }
3586 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3587 sbi->s_cluster_bits = 0;
ac27a0ec 3588 }
281b5995
TT		 3589 sbi->s_cluster_ratio = clustersize / blocksize;
3590
ac27a0ec 3591 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3592 ext4_msg(sb, KERN_ERR,
3593 "#inodes per group too big: %lu",
2b2d6d01 3594 sbi->s_inodes_per_group);
ac27a0ec
DK		 3595 goto failed_mount;
3596 }
3597
bf43d84b
ES		 3598 /*
3599 * Test whether we have more sectors than will fit in sector_t,
3600 * and whether the max offset is addressable by the page cache.
3601 */
5a9ae68a 3602 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3603 ext4_blocks_count(es));
5a9ae68a 3604 if (err) {
b31e1552 3605 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3606 " too large to mount safely on this system");
ac27a0ec 3607 if (sizeof(sector_t) < 8)
90c699a9 3608 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3609 goto failed_mount;
3610 }
3611
617ba13b
MC		 3612 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3613 goto cantfind_ext4;
e7c95593 3614
0f2ddca6
FTN		 3615 /* check blocks count against device size */
3616 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3617 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3618 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3619 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3620 ext4_blocks_count(es), blocks_count);
3621 goto failed_mount;
3622 }
3623
0b8e58a1
AD		 3624 /*
3625 * It makes no sense for the first data block to be beyond the end
3626 * of the filesystem.
3627 */
3628 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3629 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3630 "block %u is beyond end of filesystem (%llu)",
3631 le32_to_cpu(es->s_first_data_block),
3632 ext4_blocks_count(es));
e7c95593
ES		 3633 goto failed_mount;
3634 }
bd81d8ee
LV		 3635 blocks_count = (ext4_blocks_count(es) -
3636 le32_to_cpu(es->s_first_data_block) +
3637 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3638 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3639 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3640 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3641 "(block count %llu, first data block %u, "
b31e1552 3642 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3643 ext4_blocks_count(es),
3644 le32_to_cpu(es->s_first_data_block),
3645 EXT4_BLOCKS_PER_GROUP(sb));
3646 goto failed_mount;
3647 }
bd81d8ee 3648 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3649 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3650 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3651 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3652 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3653 sbi->s_group_desc = ext4_kvmalloc(db_count *
3654 sizeof(struct buffer_head *),
3655 GFP_KERNEL);
ac27a0ec 3656 if (sbi->s_group_desc == NULL) {
b31e1552 3657 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3658 ret = -ENOMEM;
ac27a0ec
DK		 3659 goto failed_mount;
3660 }
3661
9f6200bb
TT		 3662 if (ext4_proc_root)
3663 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3664
66acdcf4
TT		 3665 if (sbi->s_proc)
3666 proc_create_data("options", S_IRUGO, sbi->s_proc,
3667 &ext4_seq_options_fops, sb);
3668
705895b6 3669 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3670
3671 for (i = 0; i < db_count; i++) {
70bbb3e0 3672 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3673 sbi->s_group_desc[i] = sb_bread(sb, block);
3674 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3675 ext4_msg(sb, KERN_ERR,
3676 "can't read group descriptor %d", i);
ac27a0ec
DK		 3677 db_count = i;
3678 goto failed_mount2;
3679 }
3680 }
bfff6873 3681 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3682 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3683 goto failed_mount2;
3684 }
772cb7c8
JS		 3685 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3686 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3687 ext4_msg(sb, KERN_ERR,
3688 "unable to initialize "
3689 "flex_bg meta info!");
772cb7c8
JS		 3690 goto failed_mount2;
3691 }
3692
ac27a0ec
DK		 3693 sbi->s_gdb_count = db_count;
3694 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3695 spin_lock_init(&sbi->s_next_gen_lock);
3696
04496411
TM		 3697 init_timer(&sbi->s_err_report);
3698 sbi->s_err_report.function = print_daily_error_info;
3699 sbi->s_err_report.data = (unsigned long) sb;
3700
57042651 3701 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3702 ext4_count_free_clusters(sb));
ce7e010a
TT		 3703 if (!err) {
3704 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3705 ext4_count_free_inodes(sb));
3706 }
3707 if (!err) {
3708 err = percpu_counter_init(&sbi->s_dirs_counter,
3709 ext4_count_dirs(sb));
3710 }
3711 if (!err) {
57042651 3712 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a 3713 }
1ac6466f
TT		 3714 if (!err) {
3715 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3716 }
ce7e010a
TT		 3717 if (err) {
3718 ext4_msg(sb, KERN_ERR, "insufficient memory");
3719 goto failed_mount3;
3720 }
3721
c9de560d 3722 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3723 sbi->s_max_writeback_mb_bump = 128;
67a5da56 3724 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3725
74cd15cd
ZL		 3726 /* Register extent status tree shrinker */
3727 ext4_es_register_shrinker(sb);
3728
ac27a0ec
DK		 3729 /*
3730 * set up enough so that it can read an inode
3731 */
9ca92389
TT		 3732 if (!test_opt(sb, NOLOAD) &&
3733 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3734 sb->s_op = &ext4_sops;
3735 else
3736 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3737 sb->s_export_op = &ext4_export_ops;
3738 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3739#ifdef CONFIG_QUOTA
617ba13b 3740 sb->dq_op = &ext4_quota_operations;
262b4662 3741 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3742 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3743 else
3744 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3745#endif
f2fa2ffc
AK		 3746 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3747
ac27a0ec 3748 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3749 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3750
3751 sb->s_root = NULL;
3752
3753 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3754 EXT4_HAS_INCOMPAT_FEATURE(sb,
3755 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3756
c5e06d10
JL		 3757 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3758 !(sb->s_flags & MS_RDONLY))
3759 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3760 goto failed_mount3;
3761
ac27a0ec
DK		 3762 /*
3763 * The first inode we look at is the journal inode. Don't try
3764 * root first: it may be modified in the journal!
3765 */
3766 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3767 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3768 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3769 goto failed_mount3;
0390131b
FM		 3770 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3771 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3772 ext4_msg(sb, KERN_ERR, "required journal recovery "
3773 "suppressed and not mounted read-only");
744692dc 3774 goto failed_mount_wq;
ac27a0ec 3775 } else {
fd8c37ec 3776 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3777 sbi->s_journal = NULL;
3778 needs_recovery = 0;
3779 goto no_journal;
ac27a0ec
DK		 3780 }
3781
f32aaf2d 3782 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3783 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3784 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3785 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3786 goto failed_mount_wq;
eb40a09c
JS		 3787 }
3788
25ed6e8a
DW		 3789 if (!set_journal_csum_feature_set(sb)) {
3790 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3791 "feature set");
3792 goto failed_mount_wq;
d4da6c9c 3793 }
818d276c 3794
ac27a0ec
DK		 3795 /* We have now updated the journal if required, so we can
3796 * validate the data journaling mode. */
3797 switch (test_opt(sb, DATA_FLAGS)) {
3798 case 0:
3799 /* No mode set, assume a default based on the journal
63f57933
AM		 3800 * capabilities: ORDERED_DATA if the journal can
3801 * cope, else JOURNAL_DATA
3802 */
dab291af
MC		 3803 if (jbd2_journal_check_available_features
3804 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3805 set_opt(sb, ORDERED_DATA);
ac27a0ec 3806 else
fd8c37ec 3807 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3808 break;
3809
617ba13b
MC		 3810 case EXT4_MOUNT_ORDERED_DATA:
3811 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3812 if (!jbd2_journal_check_available_features
3813 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3814 ext4_msg(sb, KERN_ERR, "Journal does not support "
3815 "requested data journaling mode");
744692dc 3816 goto failed_mount_wq;
ac27a0ec
DK		 3817 }
3818 default:
3819 break;
3820 }
b3881f74 3821 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3822
18aadd47
BJ		 3823 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3824
ce7e010a
TT		 3825 /*
3826 * The journal may have updated the bg summary counts, so we
3827 * need to update the global counters.
3828 */
57042651 3829 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3830 ext4_count_free_clusters(sb));
ce7e010a
TT		 3831 percpu_counter_set(&sbi->s_freeinodes_counter,
3832 ext4_count_free_inodes(sb));
3833 percpu_counter_set(&sbi->s_dirs_counter,
3834 ext4_count_dirs(sb));
57042651 3835 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3836
ce7e010a 3837no_journal:
952fc18e
TT		 3838 /*
3839 * Get the # of file system overhead blocks from the
3840 * superblock if present.
3841 */
3842 if (es->s_overhead_clusters)
3843 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3844 else {
07aa2ea1
LC		 3845 err = ext4_calculate_overhead(sb);
3846 if (err)
952fc18e
TT		 3847 goto failed_mount_wq;
3848 }
3849
fd89d5f2
TH		 3850 /*
3851 * The maximum number of concurrent works can be high and
3852 * concurrency isn't really necessary. Limit it to 1.
3853 */
3854 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3855 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3856 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3857 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
07aa2ea1 3858 ret = -ENOMEM;
4c0425ff
MC		 3859 goto failed_mount_wq;
3860 }
3861
ac27a0ec 3862 /*
dab291af 3863 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3864 * so we can safely mount the rest of the filesystem now.
3865 */
3866
1d1fe1ee
DH		 3867 root = ext4_iget(sb, EXT4_ROOT_INO);
3868 if (IS_ERR(root)) {
b31e1552 3869 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3870 ret = PTR_ERR(root);
32a9bb57 3871 root = NULL;
ac27a0ec
DK		 3872 goto failed_mount4;
3873 }
3874 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3875 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3876 iput(root);
ac27a0ec
DK		 3877 goto failed_mount4;
3878 }
48fde701 3879 sb->s_root = d_make_root(root);
1d1fe1ee 3880 if (!sb->s_root) {
b31e1552 3881 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3882 ret = -ENOMEM;
3883 goto failed_mount4;
3884 }
ac27a0ec 3885
7e84b621
ES		 3886 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3887 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3888
3889 /* determine the minimum size of new large inodes, if present */
3890 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3891 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3892 EXT4_GOOD_OLD_INODE_SIZE;
3893 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3894 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3895 if (sbi->s_want_extra_isize <
3896 le16_to_cpu(es->s_want_extra_isize))
3897 sbi->s_want_extra_isize =
3898 le16_to_cpu(es->s_want_extra_isize);
3899 if (sbi->s_want_extra_isize <
3900 le16_to_cpu(es->s_min_extra_isize))
3901 sbi->s_want_extra_isize =
3902 le16_to_cpu(es->s_min_extra_isize);
3903 }
3904 }
3905 /* Check if enough inode space is available */
3906 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3907 sbi->s_inode_size) {
3908 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3909 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3910 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3911 "available");
ef7f3835
KS		 3912 }
3913
6fd058f7
TT		 3914 err = ext4_setup_system_zone(sb);
3915 if (err) {
b31e1552 3916 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3917 "zone (%d)", err);
94bf608a 3918 goto failed_mount4a;
6fd058f7
TT		 3919 }
3920
c2774d84 3921 ext4_ext_init(sb);
9d99012f 3922 err = ext4_mb_init(sb);
c2774d84 3923 if (err) {
421f91d2 3924 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3925 err);
dcf2d804 3926 goto failed_mount5;
c2774d84
AK		 3927 }
3928
bfff6873
LC		 3929 err = ext4_register_li_request(sb, first_not_zeroed);
3930 if (err)
dcf2d804 3931 goto failed_mount6;
bfff6873 3932
3197ebdb
TT		 3933 sbi->s_kobj.kset = ext4_kset;
3934 init_completion(&sbi->s_kobj_unregister);
3935 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3936 "%s", sb->s_id);
dcf2d804
TM		 3937 if (err)
3938 goto failed_mount7;
3197ebdb 3939
9b2ff357
JK		 3940#ifdef CONFIG_QUOTA
3941 /* Enable quota usage during mount. */
3942 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
3943 !(sb->s_flags & MS_RDONLY)) {
3944 err = ext4_enable_quotas(sb);
3945 if (err)
3946 goto failed_mount8;
3947 }
3948#endif /* CONFIG_QUOTA */
3949
617ba13b
MC		 3950 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3951 ext4_orphan_cleanup(sb, es);
3952 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3953 if (needs_recovery) {
b31e1552 3954 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3955 ext4_mark_recovery_complete(sb, es);
3956 }
3957 if (EXT4_SB(sb)->s_journal) {
3958 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3959 descr = " journalled data mode";
3960 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3961 descr = " ordered data mode";
3962 else
3963 descr = " writeback data mode";
3964 } else
3965 descr = "out journal";
3966
79add3a3
LC		 3967 if (test_opt(sb, DISCARD)) {
3968 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3969 if (!blk_queue_discard(q))
3970 ext4_msg(sb, KERN_WARNING,
3971 "mounting with \"discard\" option, but "
3972 "the device does not support discard");
3973 }
3974
d4c402d9 3975 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3976 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3977 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3978
66e61a9e
TT		 3979 if (es->s_error_count)
3980 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3981
d4c402d9 3982 kfree(orig_data);
ac27a0ec
DK		 3983 return 0;
3984
617ba13b 3985cantfind_ext4:
ac27a0ec 3986 if (!silent)
b31e1552 3987 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3988 goto failed_mount;
3989
72ba7450
TT		 3990#ifdef CONFIG_QUOTA
3991failed_mount8:
3992 kobject_del(&sbi->s_kobj);
3993#endif
dcf2d804
TM		 3994failed_mount7:
3995 ext4_unregister_li_request(sb);
3996failed_mount6:
dcf2d804 3997 ext4_mb_release(sb);
94bf608a
AV		 3998failed_mount5:
3999 ext4_ext_release(sb);
dcf2d804 4000 ext4_release_system_zone(sb);
94bf608a
AV		 4001failed_mount4a:
4002 dput(sb->s_root);
32a9bb57 4003 sb->s_root = NULL;
94bf608a 4004failed_mount4:
b31e1552 4005 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4006 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4007failed_mount_wq:
0390131b
FM		 4008 if (sbi->s_journal) {
4009 jbd2_journal_destroy(sbi->s_journal);
4010 sbi->s_journal = NULL;
4011 }
ac27a0ec 4012failed_mount3:
04496411 4013 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4014 if (sbi->s_flex_groups)
4015 ext4_kvfree(sbi->s_flex_groups);
57042651 4016 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4017 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4018 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4019 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 4020 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
c5e06d10
JL		 4021 if (sbi->s_mmp_tsk)
4022 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4023failed_mount2:
4024 for (i = 0; i < db_count; i++)
4025 brelse(sbi->s_group_desc[i]);
f18a5f21 4026 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4027failed_mount:
0441984a
DW		 4028 if (sbi->s_chksum_driver)
4029 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4030 if (sbi->s_proc) {
66acdcf4 4031 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4032 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4033 }
ac27a0ec
DK		 4034#ifdef CONFIG_QUOTA
4035 for (i = 0; i < MAXQUOTAS; i++)
4036 kfree(sbi->s_qf_names[i]);
4037#endif
617ba13b 4038 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4039 brelse(bh);
4040out_fail:
4041 sb->s_fs_info = NULL;
f6830165 4042 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4043 kfree(sbi);
dcc7dae3 4044out_free_orig:
d4c402d9 4045 kfree(orig_data);
07aa2ea1 4046 return err ? err : ret;
ac27a0ec
DK		 4047}
4048
4049/*
4050 * Setup any per-fs journal parameters now. We'll do this both on
4051 * initial mount, once the journal has been initialised but before we've
4052 * done any recovery; and again on any subsequent remount.
4053 */
617ba13b 4054static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4055{
617ba13b 4056 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4057
30773840
TT		 4058 journal->j_commit_interval = sbi->s_commit_interval;
4059 journal->j_min_batch_time = sbi->s_min_batch_time;
4060 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4061
a931da6a 4062 write_lock(&journal->j_state_lock);
ac27a0ec 4063 if (test_opt(sb, BARRIER))
dab291af 4064 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4065 else
dab291af 4066 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4067 if (test_opt(sb, DATA_ERR_ABORT))
4068 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4069 else
4070 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4071 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4072}
4073
617ba13b 4074static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4075 unsigned int journal_inum)
4076{
4077 struct inode *journal_inode;
4078 journal_t *journal;
4079
0390131b
FM		 4080 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4081
ac27a0ec
DK		 4082 /* First, test for the existence of a valid inode on disk. Bad
4083 * things happen if we iget() an unused inode, as the subsequent
4084 * iput() will try to delete it. */
4085
1d1fe1ee
DH		 4086 journal_inode = ext4_iget(sb, journal_inum);
4087 if (IS_ERR(journal_inode)) {
b31e1552 4088 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4089 return NULL;
4090 }
4091 if (!journal_inode->i_nlink) {
4092 make_bad_inode(journal_inode);
4093 iput(journal_inode);
b31e1552 4094 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4095 return NULL;
4096 }
4097
e5f8eab8 4098 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4099 journal_inode, journal_inode->i_size);
1d1fe1ee 4100 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4101 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4102 iput(journal_inode);
4103 return NULL;
4104 }
4105
dab291af 4106 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4107 if (!journal) {
b31e1552 4108 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4109 iput(journal_inode);
4110 return NULL;
4111 }
4112 journal->j_private = sb;
617ba13b 4113 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4114 return journal;
4115}
4116
617ba13b 4117static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4118 dev_t j_dev)
4119{
2b2d6d01 4120 struct buffer_head *bh;
ac27a0ec 4121 journal_t *journal;
617ba13b
MC		 4122 ext4_fsblk_t start;
4123 ext4_fsblk_t len;
ac27a0ec 4124 int hblock, blocksize;
617ba13b 4125 ext4_fsblk_t sb_block;
ac27a0ec 4126 unsigned long offset;
2b2d6d01 4127 struct ext4_super_block *es;
ac27a0ec
DK		 4128 struct block_device *bdev;
4129
0390131b
FM		 4130 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4131
b31e1552 4132 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4133 if (bdev == NULL)
4134 return NULL;
4135
ac27a0ec 4136 blocksize = sb->s_blocksize;
e1defc4f 4137 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4138 if (blocksize < hblock) {
b31e1552
ES		 4139 ext4_msg(sb, KERN_ERR,
4140 "blocksize too small for journal device");
ac27a0ec
DK		 4141 goto out_bdev;
4142 }
4143
617ba13b
MC		 4144 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4145 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4146 set_blocksize(bdev, blocksize);
4147 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4148 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4149 "external journal");
ac27a0ec
DK		 4150 goto out_bdev;
4151 }
4152
2716b802 4153 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4154 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4155 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4156 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4157 ext4_msg(sb, KERN_ERR, "external journal has "
4158 "bad superblock");
ac27a0ec
DK		 4159 brelse(bh);
4160 goto out_bdev;
4161 }
4162
617ba13b 4163 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4164 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4165 brelse(bh);
4166 goto out_bdev;
4167 }
4168
bd81d8ee 4169 len = ext4_blocks_count(es);
ac27a0ec
DK		 4170 start = sb_block + 1;
4171 brelse(bh); /* we're done with the superblock */
4172
dab291af 4173 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4174 start, len, blocksize);
4175 if (!journal) {
b31e1552 4176 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4177 goto out_bdev;
4178 }
4179 journal->j_private = sb;
4180 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4181 wait_on_buffer(journal->j_sb_buffer);
4182 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4183 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4184 goto out_journal;
4185 }
4186 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4187 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4188 "user (unsupported) - %d",
ac27a0ec
DK		 4189 be32_to_cpu(journal->j_superblock->s_nr_users));
4190 goto out_journal;
4191 }
617ba13b
MC		 4192 EXT4_SB(sb)->journal_bdev = bdev;
4193 ext4_init_journal_params(sb, journal);
ac27a0ec 4194 return journal;
0b8e58a1 4195
ac27a0ec 4196out_journal:
dab291af 4197 jbd2_journal_destroy(journal);
ac27a0ec 4198out_bdev:
617ba13b 4199 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4200 return NULL;
4201}
4202
617ba13b
MC		 4203static int ext4_load_journal(struct super_block *sb,
4204 struct ext4_super_block *es,
ac27a0ec
DK		 4205 unsigned long journal_devnum)
4206{
4207 journal_t *journal;
4208 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4209 dev_t journal_dev;
4210 int err = 0;
4211 int really_read_only;
4212
0390131b
FM		 4213 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4214
ac27a0ec
DK		 4215 if (journal_devnum &&
4216 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4217 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4218 "numbers have changed");
ac27a0ec
DK		 4219 journal_dev = new_decode_dev(journal_devnum);
4220 } else
4221 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4222
4223 really_read_only = bdev_read_only(sb->s_bdev);
4224
4225 /*
4226 * Are we loading a blank journal or performing recovery after a
4227 * crash? For recovery, we need to check in advance whether we
4228 * can get read-write access to the device.
4229 */
617ba13b 4230 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4231 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4232 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4233 "required on readonly filesystem");
ac27a0ec 4234 if (really_read_only) {
b31e1552
ES		 4235 ext4_msg(sb, KERN_ERR, "write access "
4236 "unavailable, cannot proceed");
ac27a0ec
DK		 4237 return -EROFS;
4238 }
b31e1552
ES		 4239 ext4_msg(sb, KERN_INFO, "write access will "
4240 "be enabled during recovery");
ac27a0ec
DK		 4241 }
4242 }
4243
4244 if (journal_inum && journal_dev) {
b31e1552
ES		 4245 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4246 "and inode journals!");
ac27a0ec
DK		 4247 return -EINVAL;
4248 }
4249
4250 if (journal_inum) {
617ba13b 4251 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4252 return -EINVAL;
4253 } else {
617ba13b 4254 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4255 return -EINVAL;
4256 }
4257
90576c0b 4258 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4259 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4260
617ba13b 4261 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4262 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4263 if (!err) {
4264 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4265 if (save)
4266 memcpy(save, ((char *) es) +
4267 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4268 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4269 if (save)
4270 memcpy(((char *) es) + EXT4_S_ERR_START,
4271 save, EXT4_S_ERR_LEN);
4272 kfree(save);
4273 }
ac27a0ec
DK		 4274
4275 if (err) {
b31e1552 4276 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4277 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4278 return err;
4279 }
4280
617ba13b
MC		 4281 EXT4_SB(sb)->s_journal = journal;
4282 ext4_clear_journal_err(sb, es);
ac27a0ec 4283
c41303ce 4284 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4285 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4286 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4287
4288 /* Make sure we flush the recovery flag to disk. */
e2d67052 4289 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4290 }
4291
4292 return 0;
4293}
4294
e2d67052 4295static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4296{
e2d67052 4297 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4298 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4299 int error = 0;
ac27a0ec 4300
7c2e7087 4301 if (!sbh || block_device_ejected(sb))
c4be0c1d 4302 return error;
914258bf
TT		 4303 if (buffer_write_io_error(sbh)) {
4304 /*
4305 * Oh, dear. A previous attempt to write the
4306 * superblock failed. This could happen because the
4307 * USB device was yanked out. Or it could happen to
4308 * be a transient write error and maybe the block will
4309 * be remapped. Nothing we can do but to retry the
4310 * write and hope for the best.
4311 */
b31e1552
ES		 4312 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4313 "superblock detected");
914258bf
TT		 4314 clear_buffer_write_io_error(sbh);
4315 set_buffer_uptodate(sbh);
4316 }
71290b36
TT		 4317 /*
4318 * If the file system is mounted read-only, don't update the
4319 * superblock write time. This avoids updating the superblock
4320 * write time when we are mounting the root file system
4321 * read/only but we need to replay the journal; at that point,
4322 * for people who are east of GMT and who make their clock
4323 * tick in localtime for Windows bug-for-bug compatibility,
4324 * the clock is set in the future, and this will cause e2fsck
4325 * to complain and force a full file system check.
4326 */
4327 if (!(sb->s_flags & MS_RDONLY))
4328 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4329 if (sb->s_bdev->bd_part)
4330 es->s_kbytes_written =
4331 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4332 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4333 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4334 else
4335 es->s_kbytes_written =
4336 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4337 ext4_free_blocks_count_set(es,
4338 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4339 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4340 es->s_free_inodes_count =
4341 cpu_to_le32(percpu_counter_sum_positive(
4342 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4343 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4344 ext4_superblock_csum_set(sb);
ac27a0ec 4345 mark_buffer_dirty(sbh);
914258bf 4346 if (sync) {
c4be0c1d
TS		 4347 error = sync_dirty_buffer(sbh);
4348 if (error)
4349 return error;
4350
4351 error = buffer_write_io_error(sbh);
4352 if (error) {
b31e1552
ES		 4353 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4354 "superblock");
914258bf
TT		 4355 clear_buffer_write_io_error(sbh);
4356 set_buffer_uptodate(sbh);
4357 }
4358 }
c4be0c1d 4359 return error;
ac27a0ec
DK		 4360}
4361
ac27a0ec
DK		 4362/*
4363 * Have we just finished recovery? If so, and if we are mounting (or
4364 * remounting) the filesystem readonly, then we will end up with a
4365 * consistent fs on disk. Record that fact.
4366 */
2b2d6d01
TT		 4367static void ext4_mark_recovery_complete(struct super_block *sb,
4368 struct ext4_super_block *es)
ac27a0ec 4369{
617ba13b 4370 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4371
0390131b
FM		 4372 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4373 BUG_ON(journal != NULL);
4374 return;
4375 }
dab291af 4376 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4377 if (jbd2_journal_flush(journal) < 0)
4378 goto out;
4379
617ba13b 4380 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4381 sb->s_flags & MS_RDONLY) {
617ba13b 4382 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4383 ext4_commit_super(sb, 1);
ac27a0ec 4384 }
7ffe1ea8
HK		 4385
4386out:
dab291af 4387 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4388}
4389
4390/*
4391 * If we are mounting (or read-write remounting) a filesystem whose journal
4392 * has recorded an error from a previous lifetime, move that error to the
4393 * main filesystem now.
4394 */
2b2d6d01
TT		 4395static void ext4_clear_journal_err(struct super_block *sb,
4396 struct ext4_super_block *es)
ac27a0ec
DK		 4397{
4398 journal_t *journal;
4399 int j_errno;
4400 const char *errstr;
4401
0390131b
FM		 4402 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4403
617ba13b 4404 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4405
4406 /*
4407 * Now check for any error status which may have been recorded in the
617ba13b 4408 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4409 */
4410
dab291af 4411 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4412 if (j_errno) {
4413 char nbuf[16];
4414
617ba13b 4415 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4416 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4417 "from previous mount: %s", errstr);
12062ddd 4418 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4419
617ba13b
MC		 4420 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4421 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4422 ext4_commit_super(sb, 1);
ac27a0ec 4423
dab291af 4424 jbd2_journal_clear_err(journal);
d796c52e 4425 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4426 }
4427}
4428
4429/*
4430 * Force the running and committing transactions to commit,
4431 * and wait on the commit.
4432 */
617ba13b 4433int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4434{
4435 journal_t *journal;
ac27a0ec
DK		 4436
4437 if (sb->s_flags & MS_RDONLY)
4438 return 0;
4439
617ba13b 4440 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4441 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4442}
4443
617ba13b 4444static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4445{
14ce0cb4 4446 int ret = 0;
9eddacf9 4447 tid_t target;
8d5d02e6 4448 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4449
9bffad1e 4450 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4451 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4452 /*
4453 * Writeback quota in non-journalled quota case - journalled quota has
4454 * no dirty dquots
4455 */
4456 dquot_writeback_dquots(sb, -1);
8d5d02e6 4457 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4458 if (wait)
8d5d02e6 4459 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4460 }
14ce0cb4 4461 return ret;
ac27a0ec
DK		 4462}
4463
4464/*
4465 * LVM calls this function before a (read-only) snapshot is created. This
4466 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4467 *
4468 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4469 * state independently. It relies on upper layer to stop all data & metadata
4470 * modifications.
ac27a0ec 4471 */
c4be0c1d 4472static int ext4_freeze(struct super_block *sb)
ac27a0ec 4473{
c4be0c1d
TS		 4474 int error = 0;
4475 journal_t *journal;
ac27a0ec 4476
9ca92389
TT		 4477 if (sb->s_flags & MS_RDONLY)
4478 return 0;
ac27a0ec 4479
9ca92389 4480 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4481
9ca92389
TT		 4482 /* Now we set up the journal barrier. */
4483 jbd2_journal_lock_updates(journal);
ac27a0ec 4484
9ca92389
TT		 4485 /*
4486 * Don't clear the needs_recovery flag if we failed to flush
4487 * the journal.
4488 */
4489 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4490 if (error < 0)
4491 goto out;
9ca92389
TT		 4492
4493 /* Journal blocked and flushed, clear needs_recovery flag. */
4494 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4495 error = ext4_commit_super(sb, 1);
6b0310fb 4496out:
8e8ad8a5 4497 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4498 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4499 return error;
ac27a0ec
DK		 4500}
4501
4502/*
4503 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4504 * flag here, even though the filesystem is not technically dirty yet.
4505 */
c4be0c1d 4506static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4507{
9ca92389
TT		 4508 if (sb->s_flags & MS_RDONLY)
4509 return 0;
4510
9ca92389
TT		 4511 /* Reset the needs_recovery flag before the fs is unlocked. */
4512 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4513 ext4_commit_super(sb, 1);
c4be0c1d 4514 return 0;
ac27a0ec
DK		 4515}
4516
673c6100
TT		 4517/*
4518 * Structure to save mount options for ext4_remount's benefit
4519 */
4520struct ext4_mount_options {
4521 unsigned long s_mount_opt;
a2595b8a 4522 unsigned long s_mount_opt2;
08cefc7a
EB		 4523 kuid_t s_resuid;
4524 kgid_t s_resgid;
673c6100
TT		 4525 unsigned long s_commit_interval;
4526 u32 s_min_batch_time, s_max_batch_time;
4527#ifdef CONFIG_QUOTA
4528 int s_jquota_fmt;
4529 char *s_qf_names[MAXQUOTAS];
4530#endif
4531};
4532
2b2d6d01 4533static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4534{
2b2d6d01 4535 struct ext4_super_block *es;
617ba13b 4536 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4537 unsigned long old_sb_flags;
617ba13b 4538 struct ext4_mount_options old_opts;
c79d967d 4539 int enable_quota = 0;
8a266467 4540 ext4_group_t g;
b3881f74 4541 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4542 int err = 0;
ac27a0ec 4543#ifdef CONFIG_QUOTA
03dafb5f 4544 int i, j;
ac27a0ec 4545#endif
d4c402d9 4546 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4547
4548 /* Store the original options */
4549 old_sb_flags = sb->s_flags;
4550 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4551 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4552 old_opts.s_resuid = sbi->s_resuid;
4553 old_opts.s_resgid = sbi->s_resgid;
4554 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4555 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4556 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4557#ifdef CONFIG_QUOTA
4558 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4559 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f
CG		 4560 if (sbi->s_qf_names[i]) {
4561 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4562 GFP_KERNEL);
4563 if (!old_opts.s_qf_names[i]) {
4564 for (j = 0; j < i; j++)
4565 kfree(old_opts.s_qf_names[j]);
3e36a163 4566 kfree(orig_data);
03dafb5f
CG		 4567 return -ENOMEM;
4568 }
4569 } else
4570 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4571#endif
b3881f74
TT		 4572 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4573 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4574
4575 /*
4576 * Allow the "check" option to be passed as a remount option.
4577 */
661aa520 4578 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4579 err = -EINVAL;
4580 goto restore_opts;
4581 }
4582
4ab2f15b 4583 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4584 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4585
4586 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4587 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4588
4589 es = sbi->s_es;
4590
b3881f74 4591 if (sbi->s_journal) {
0390131b 4592 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4593 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4594 }
ac27a0ec 4595
661aa520 4596 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4597 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4598 err = -EROFS;
4599 goto restore_opts;
4600 }
4601
4602 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4603 err = dquot_suspend(sb, -1);
4604 if (err < 0)
c79d967d 4605 goto restore_opts;
c79d967d 4606
ac27a0ec
DK		 4607 /*
4608 * First of all, the unconditional stuff we have to do
4609 * to disable replay of the journal when we next remount
4610 */
4611 sb->s_flags |= MS_RDONLY;
4612
4613 /*
4614 * OK, test if we are remounting a valid rw partition
4615 * readonly, and if so set the rdonly flag and then
4616 * mark the partition as valid again.
4617 */
617ba13b
MC		 4618 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4619 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4620 es->s_state = cpu_to_le16(sbi->s_mount_state);
4621
a63c9eb2 4622 if (sbi->s_journal)
0390131b 4623 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4624 } else {
a13fb1a4
ES		 4625 /* Make sure we can mount this feature set readwrite */
4626 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4627 err = -EROFS;
4628 goto restore_opts;
4629 }
8a266467
TT		 4630 /*
4631 * Make sure the group descriptor checksums
0b8e58a1 4632 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4633 */
4634 for (g = 0; g < sbi->s_groups_count; g++) {
4635 struct ext4_group_desc *gdp =
4636 ext4_get_group_desc(sb, g, NULL);
4637
feb0ab32 4638 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4639 ext4_msg(sb, KERN_ERR,
4640 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4641 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4642 le16_to_cpu(gdp->bg_checksum));
4643 err = -EINVAL;
4644 goto restore_opts;
4645 }
4646 }
4647
ead6596b
ES		 4648 /*
4649 * If we have an unprocessed orphan list hanging
4650 * around from a previously readonly bdev mount,
4651 * require a full umount/remount for now.
4652 */
4653 if (es->s_last_orphan) {
b31e1552 4654 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4655 "remount RDWR because of unprocessed "
4656 "orphan inode list. Please "
b31e1552 4657 "umount/remount instead");
ead6596b
ES		 4658 err = -EINVAL;
4659 goto restore_opts;
4660 }
4661
ac27a0ec
DK		 4662 /*
4663 * Mounting a RDONLY partition read-write, so reread
4664 * and store the current valid flag. (It may have
4665 * been changed by e2fsck since we originally mounted
4666 * the partition.)
4667 */
0390131b
FM		 4668 if (sbi->s_journal)
4669 ext4_clear_journal_err(sb, es);
ac27a0ec 4670 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4671 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4672 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4673 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4674 EXT4_FEATURE_INCOMPAT_MMP))
4675 if (ext4_multi_mount_protect(sb,
4676 le64_to_cpu(es->s_mmp_block))) {
4677 err = -EROFS;
4678 goto restore_opts;
4679 }
c79d967d 4680 enable_quota = 1;
ac27a0ec
DK		 4681 }
4682 }
bfff6873
LC		 4683
4684 /*
4685 * Reinitialize lazy itable initialization thread based on
4686 * current settings
4687 */
4688 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4689 ext4_unregister_li_request(sb);
4690 else {
4691 ext4_group_t first_not_zeroed;
4692 first_not_zeroed = ext4_has_uninit_itable(sb);
4693 ext4_register_li_request(sb, first_not_zeroed);
4694 }
4695
6fd058f7 4696 ext4_setup_system_zone(sb);
d096ad0f 4697 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4698 ext4_commit_super(sb, 1);
0390131b 4699
ac27a0ec
DK		 4700#ifdef CONFIG_QUOTA
4701 /* Release old quota file names */
4702 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f 4703 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4704 if (enable_quota) {
4705 if (sb_any_quota_suspended(sb))
4706 dquot_resume(sb, -1);
4707 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4708 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4709 err = ext4_enable_quotas(sb);
07724f98 4710 if (err)
7c319d32 4711 goto restore_opts;
7c319d32
AK		 4712 }
4713 }
ac27a0ec 4714#endif
d4c402d9
CW		 4715
4716 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4717 kfree(orig_data);
ac27a0ec 4718 return 0;
0b8e58a1 4719
ac27a0ec
DK		 4720restore_opts:
4721 sb->s_flags = old_sb_flags;
4722 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4723 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4724 sbi->s_resuid = old_opts.s_resuid;
4725 sbi->s_resgid = old_opts.s_resgid;
4726 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4727 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4728 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4729#ifdef CONFIG_QUOTA
4730 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4731 for (i = 0; i < MAXQUOTAS; i++) {
03dafb5f 4732 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4733 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4734 }
4735#endif
d4c402d9 4736 kfree(orig_data);
ac27a0ec
DK		 4737 return err;
4738}
4739
2b2d6d01 4740static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4741{
4742 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4743 struct ext4_sb_info *sbi = EXT4_SB(sb);
4744 struct ext4_super_block *es = sbi->s_es;
952fc18e 4745 ext4_fsblk_t overhead = 0;
960cc398 4746 u64 fsid;
d02a9391 4747 s64 bfree;
ac27a0ec 4748
952fc18e
TT		 4749 if (!test_opt(sb, MINIX_DF))
4750 overhead = sbi->s_overhead;
ac27a0ec 4751
617ba13b 4752 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4753 buf->f_bsize = sb->s_blocksize;
b72f78cb 4754 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4755 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4756 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4757 /* prevent underflow in case that few free space is available */
57042651 4758 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4759 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4760 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4761 buf->f_bavail = 0;
4762 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4763 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4764 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4765 fsid = le64_to_cpup((void *)es->s_uuid) ^
4766 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4767 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4768 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4769
ac27a0ec
DK		 4770 return 0;
4771}
4772
0b8e58a1
AD		 4773/* Helper function for writing quotas on sync - we need to start transaction
4774 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4775 * Process 1 Process 2
617ba13b 4776 * ext4_create() quota_sync()
a269eb18 4777 * jbd2_journal_start() write_dquot()
871a2931 4778 * dquot_initialize() down(dqio_mutex)
dab291af 4779 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4780 *
4781 */
4782
4783#ifdef CONFIG_QUOTA
4784
4785static inline struct inode *dquot_to_inode(struct dquot *dquot)
4786{
4c376dca 4787 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4788}
4789
617ba13b 4790static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4791{
4792 int ret, err;
4793 handle_t *handle;
4794 struct inode *inode;
4795
4796 inode = dquot_to_inode(dquot);
9924a92a 4797 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4798 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4799 if (IS_ERR(handle))
4800 return PTR_ERR(handle);
4801 ret = dquot_commit(dquot);
617ba13b 4802 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4803 if (!ret)
4804 ret = err;
4805 return ret;
4806}
4807
617ba13b 4808static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4809{
4810 int ret, err;
4811 handle_t *handle;
4812
9924a92a 4813 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4814 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4815 if (IS_ERR(handle))
4816 return PTR_ERR(handle);
4817 ret = dquot_acquire(dquot);
617ba13b 4818 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4819 if (!ret)
4820 ret = err;
4821 return ret;
4822}
4823
617ba13b 4824static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4825{
4826 int ret, err;
4827 handle_t *handle;
4828
9924a92a 4829 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4830 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4831 if (IS_ERR(handle)) {
4832 /* Release dquot anyway to avoid endless cycle in dqput() */
4833 dquot_release(dquot);
ac27a0ec 4834 return PTR_ERR(handle);
9c3013e9 4835 }
ac27a0ec 4836 ret = dquot_release(dquot);
617ba13b 4837 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4838 if (!ret)
4839 ret = err;
4840 return ret;
4841}
4842
617ba13b 4843static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4844{
262b4662
JK		 4845 struct super_block *sb = dquot->dq_sb;
4846 struct ext4_sb_info *sbi = EXT4_SB(sb);
4847
2c8be6b2 4848 /* Are we journaling quotas? */
262b4662
JK		 4849 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
4850 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4851 dquot_mark_dquot_dirty(dquot);
617ba13b 4852 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4853 } else {
4854 return dquot_mark_dquot_dirty(dquot);
4855 }
4856}
4857
617ba13b 4858static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4859{
4860 int ret, err;
4861 handle_t *handle;
4862
4863 /* Data block + inode block */
9924a92a 4864 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 4865 if (IS_ERR(handle))
4866 return PTR_ERR(handle);
4867 ret = dquot_commit_info(sb, type);
617ba13b 4868 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4869 if (!ret)
4870 ret = err;
4871 return ret;
4872}
4873
4874/*
4875 * Turn on quotas during mount time - we need to find
4876 * the quota file and such...
4877 */
617ba13b 4878static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4879{
287a8095
CH		 4880 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4881 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4882}
4883
4884/*
4885 * Standard function to be called on quota_on
4886 */
617ba13b 4887static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4888 struct path *path)
ac27a0ec
DK		 4889{
4890 int err;
ac27a0ec
DK		 4891
4892 if (!test_opt(sb, QUOTA))
4893 return -EINVAL;
0623543b 4894
ac27a0ec 4895 /* Quotafile not on the same filesystem? */
d8c9584e 4896 if (path->dentry->d_sb != sb)
ac27a0ec 4897 return -EXDEV;
0623543b
JK		 4898 /* Journaling quota? */
4899 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4900 /* Quotafile not in fs root? */
f00c9e44 4901 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4902 ext4_msg(sb, KERN_WARNING,
4903 "Quota file not on filesystem root. "
4904 "Journaled quota will not work");
2b2d6d01 4905 }
0623543b
JK		 4906
4907 /*
4908 * When we journal data on quota file, we have to flush journal to see
4909 * all updates to the file when we bypass pagecache...
4910 */
0390131b 4911 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4912 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4913 /*
4914 * We don't need to lock updates but journal_flush() could
4915 * otherwise be livelocked...
4916 */
4917 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4918 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4919 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4920 if (err)
7ffe1ea8 4921 return err;
0623543b
JK		 4922 }
4923
f00c9e44 4924 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4925}
4926
7c319d32
AK		 4927static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4928 unsigned int flags)
4929{
4930 int err;
4931 struct inode *qf_inode;
4932 unsigned long qf_inums[MAXQUOTAS] = {
4933 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4934 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4935 };
4936
4937 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4938
4939 if (!qf_inums[type])
4940 return -EPERM;
4941
4942 qf_inode = ext4_iget(sb, qf_inums[type]);
4943 if (IS_ERR(qf_inode)) {
4944 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4945 return PTR_ERR(qf_inode);
4946 }
4947
4948 err = dquot_enable(qf_inode, type, format_id, flags);
4949 iput(qf_inode);
4950
4951 return err;
4952}
4953
4954/* Enable usage tracking for all quota types. */
4955static int ext4_enable_quotas(struct super_block *sb)
4956{
4957 int type, err = 0;
4958 unsigned long qf_inums[MAXQUOTAS] = {
4959 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4960 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4961 };
4962
4963 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
4964 for (type = 0; type < MAXQUOTAS; type++) {
4965 if (qf_inums[type]) {
4966 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
4967 DQUOT_USAGE_ENABLED);
4968 if (err) {
4969 ext4_warning(sb,
72ba7450
TT		 4970 "Failed to enable quota tracking "
4971 "(type=%d, err=%d). Please run "
4972 "e2fsck to fix.", type, err);
7c319d32
AK		 4973 return err;
4974 }
4975 }
4976 }
4977 return 0;
4978}
4979
4980/*
4981 * quota_on function that is used when QUOTA feature is set.
4982 */
4983static int ext4_quota_on_sysfile(struct super_block *sb, int type,
4984 int format_id)
4985{
4986 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
4987 return -EINVAL;
4988
4989 /*
4990 * USAGE was enabled at mount time. Only need to enable LIMITS now.
4991 */
4992 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
4993}
4994
ca0e05e4
DM		 4995static int ext4_quota_off(struct super_block *sb, int type)
4996{
21f97697
JK		 4997 struct inode *inode = sb_dqopt(sb)->files[type];
4998 handle_t *handle;
4999
87009d86
DM		 5000 /* Force all delayed allocation blocks to be allocated.
5001 * Caller already holds s_umount sem */
5002 if (test_opt(sb, DELALLOC))
ca0e05e4 5003 sync_filesystem(sb);
ca0e05e4 5004
0b268590
AG		 5005 if (!inode)
5006 goto out;
5007
21f97697
JK		 5008 /* Update modification times of quota files when userspace can
5009 * start looking at them */
9924a92a 5010 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5011 if (IS_ERR(handle))
5012 goto out;
5013 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5014 ext4_mark_inode_dirty(handle, inode);
5015 ext4_journal_stop(handle);
5016
5017out:
ca0e05e4
DM		 5018 return dquot_quota_off(sb, type);
5019}
5020
7c319d32
AK		 5021/*
5022 * quota_off function that is used when QUOTA feature is set.
5023 */
5024static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5025{
5026 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5027 return -EINVAL;
5028
5029 /* Disable only the limits. */
5030 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5031}
5032
ac27a0ec
DK		 5033/* Read data from quotafile - avoid pagecache and such because we cannot afford
5034 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5035 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5036 * we don't have to be afraid of races */
617ba13b 5037static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5038 size_t len, loff_t off)
5039{
5040 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5041 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5042 int err = 0;
5043 int offset = off & (sb->s_blocksize - 1);
5044 int tocopy;
5045 size_t toread;
5046 struct buffer_head *bh;
5047 loff_t i_size = i_size_read(inode);
5048
5049 if (off > i_size)
5050 return 0;
5051 if (off+len > i_size)
5052 len = i_size-off;
5053 toread = len;
5054 while (toread > 0) {
5055 tocopy = sb->s_blocksize - offset < toread ?
5056 sb->s_blocksize - offset : toread;
617ba13b 5057 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5058 if (err)
5059 return err;
5060 if (!bh) /* A hole? */
5061 memset(data, 0, tocopy);
5062 else
5063 memcpy(data, bh->b_data+offset, tocopy);
5064 brelse(bh);
5065 offset = 0;
5066 toread -= tocopy;
5067 data += tocopy;
5068 blk++;
5069 }
5070 return len;
5071}
5072
5073/* Write to quotafile (we know the transaction is already started and has
5074 * enough credits) */
617ba13b 5075static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5076 const char *data, size_t len, loff_t off)
5077{
5078 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5079 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5080 int err = 0;
5081 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5082 struct buffer_head *bh;
5083 handle_t *handle = journal_current_handle();
5084
0390131b 5085 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5086 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5087 " cancelled because transaction is not started",
9c3013e9
JK		 5088 (unsigned long long)off, (unsigned long long)len);
5089 return -EIO;
5090 }
67eeb568
DM		 5091 /*
5092 * Since we account only one data block in transaction credits,
5093 * then it is impossible to cross a block boundary.
5094 */
5095 if (sb->s_blocksize - offset < len) {
5096 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5097 " cancelled because not block aligned",
5098 (unsigned long long)off, (unsigned long long)len);
5099 return -EIO;
5100 }
5101
67eeb568
DM		 5102 bh = ext4_bread(handle, inode, blk, 1, &err);
5103 if (!bh)
5104 goto out;
62d2b5f2
JK		 5105 err = ext4_journal_get_write_access(handle, bh);
5106 if (err) {
5107 brelse(bh);
5108 goto out;
ac27a0ec 5109 }
67eeb568
DM		 5110 lock_buffer(bh);
5111 memcpy(bh->b_data+offset, data, len);
5112 flush_dcache_page(bh->b_page);
5113 unlock_buffer(bh);
62d2b5f2 5114 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5115 brelse(bh);
ac27a0ec 5116out:
0b7f7cef 5117 if (err)
ac27a0ec 5118 return err;
67eeb568
DM		 5119 if (inode->i_size < off + len) {
5120 i_size_write(inode, off + len);
617ba13b 5121 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5122 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5123 }
67eeb568 5124 return len;
ac27a0ec
DK		 5125}
5126
5127#endif
5128
152a0836
AV		 5129static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5130 const char *dev_name, void *data)
ac27a0ec 5131{
152a0836 5132 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5133}
5134
37f328eb 5135#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5136static inline void register_as_ext2(void)
5137{
5138 int err = register_filesystem(&ext2_fs_type);
5139 if (err)
5140 printk(KERN_WARNING
5141 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5142}
5143
5144static inline void unregister_as_ext2(void)
5145{
5146 unregister_filesystem(&ext2_fs_type);
5147}
2035e776
TT		 5148
5149static inline int ext2_feature_set_ok(struct super_block *sb)
5150{
5151 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5152 return 0;
5153 if (sb->s_flags & MS_RDONLY)
5154 return 1;
5155 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5156 return 0;
5157 return 1;
5158}
24b58424
TT		 5159#else
5160static inline void register_as_ext2(void) { }
5161static inline void unregister_as_ext2(void) { }
2035e776 5162static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5163#endif
5164
37f328eb 5165#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5166static inline void register_as_ext3(void)
5167{
5168 int err = register_filesystem(&ext3_fs_type);
5169 if (err)
5170 printk(KERN_WARNING
5171 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5172}
5173
5174static inline void unregister_as_ext3(void)
5175{
5176 unregister_filesystem(&ext3_fs_type);
5177}
2035e776
TT		 5178
5179static inline int ext3_feature_set_ok(struct super_block *sb)
5180{
5181 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5182 return 0;
5183 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5184 return 0;
5185 if (sb->s_flags & MS_RDONLY)
5186 return 1;
5187 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5188 return 0;
5189 return 1;
5190}
24b58424
TT		 5191#else
5192static inline void register_as_ext3(void) { }
5193static inline void unregister_as_ext3(void) { }
2035e776 5194static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5195#endif
5196
03010a33
TT		 5197static struct file_system_type ext4_fs_type = {
5198 .owner = THIS_MODULE,
5199 .name = "ext4",
152a0836 5200 .mount = ext4_mount,
03010a33
TT		 5201 .kill_sb = kill_block_super,
5202 .fs_flags = FS_REQUIRES_DEV,
5203};
7f78e035 5204MODULE_ALIAS_FS("ext4");
03010a33 5205
8f021222 5206static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5207{
5208 struct ext4_features *ef;
5209 int ret = -ENOMEM;
5210
5211 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5212 if (!ef)
5213 goto out;
5214
5215 ef->f_kobj.kset = ext4_kset;
5216 init_completion(&ef->f_kobj_unregister);
5217 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5218 "features");
5219 if (ret) {
5220 kfree(ef);
5221 goto out;
5222 }
5223
5224 ext4_feat = ef;
5225 ret = 0;
5226out:
5227 return ret;
5228}
5229
8f021222
LC		 5230static void ext4_exit_feat_adverts(void)
5231{
5232 kobject_put(&ext4_feat->f_kobj);
5233 wait_for_completion(&ext4_feat->f_kobj_unregister);
5234 kfree(ext4_feat);
5235}
5236
e9e3bcec
ES		 5237/* Shared across all ext4 file systems */
5238wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5239struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5240
5dabfc78 5241static int __init ext4_init_fs(void)
ac27a0ec 5242{
e9e3bcec 5243 int i, err;
c9de560d 5244
07c0c5d8
AV		 5245 ext4_li_info = NULL;
5246 mutex_init(&ext4_li_mtx);
5247
9a4c8019 5248 /* Build-time check for flags consistency */
12e9b892 5249 ext4_check_flag_values();
e9e3bcec
ES		 5250
5251 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5252 mutex_init(&ext4__aio_mutex[i]);
5253 init_waitqueue_head(&ext4__ioend_wq[i]);
5254 }
5255
51865fda 5256 err = ext4_init_es();
6fd058f7
TT		 5257 if (err)
5258 return err;
51865fda
ZL		 5259
5260 err = ext4_init_pageio();
5261 if (err)
5262 goto out7;
5263
5dabfc78 5264 err = ext4_init_system_zone();
bd2d0210 5265 if (err)
d44651d0 5266 goto out6;
3197ebdb 5267 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5268 if (!ext4_kset) {
5269 err = -ENOMEM;
dd68314c 5270 goto out5;
0e376b1e 5271 }
d44651d0 5272 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5273
5274 err = ext4_init_feat_adverts();
dd68314c
TT		 5275 if (err)
5276 goto out4;
857ac889 5277
5dabfc78 5278 err = ext4_init_mballoc();
ac27a0ec 5279 if (err)
6fd058f7 5280 goto out3;
c9de560d 5281
5dabfc78 5282 err = ext4_init_xattr();
c9de560d
AT		 5283 if (err)
5284 goto out2;
ac27a0ec
DK		 5285 err = init_inodecache();
5286 if (err)
5287 goto out1;
24b58424 5288 register_as_ext3();
2035e776 5289 register_as_ext2();
03010a33 5290 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5291 if (err)
5292 goto out;
bfff6873 5293
ac27a0ec
DK		 5294 return 0;
5295out:
24b58424
TT		 5296 unregister_as_ext2();
5297 unregister_as_ext3();
ac27a0ec
DK		 5298 destroy_inodecache();
5299out1:
5dabfc78 5300 ext4_exit_xattr();
c9de560d 5301out2:
5dabfc78 5302 ext4_exit_mballoc();
6fd058f7 5303out3:
8f021222 5304 ext4_exit_feat_adverts();
dd68314c 5305out4:
d44651d0
FJ		 5306 if (ext4_proc_root)
5307 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5308 kset_unregister(ext4_kset);
d44651d0 5309out5:
5dabfc78 5310 ext4_exit_system_zone();
d44651d0 5311out6:
5dabfc78 5312 ext4_exit_pageio();
51865fda
ZL		 5313out7:
5314 ext4_exit_es();
5315
ac27a0ec
DK		 5316 return err;
5317}
5318
5dabfc78 5319static void __exit ext4_exit_fs(void)
ac27a0ec 5320{
bfff6873 5321 ext4_destroy_lazyinit_thread();
24b58424
TT		 5322 unregister_as_ext2();
5323 unregister_as_ext3();
03010a33 5324 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5325 destroy_inodecache();
5dabfc78
TT		 5326 ext4_exit_xattr();
5327 ext4_exit_mballoc();
8f021222 5328 ext4_exit_feat_adverts();
9f6200bb 5329 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5330 kset_unregister(ext4_kset);
5dabfc78
TT		 5331 ext4_exit_system_zone();
5332 ext4_exit_pageio();
ac27a0ec
DK		 5333}
5334
5335MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5336MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5337MODULE_LICENSE("GPL");
5dabfc78
TT		 5338module_init(ext4_init_fs)
5339module_exit(ext4_exit_fs)
kernel source for telekom puls (alcatel/mediatek)