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Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma
[mirror_ubuntu-bionic-kernel.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
4a092d73 48#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9c191f70 62static int ext4_mballoc_ready;
9f6200bb 63
617ba13b 64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 65 unsigned long journal_devnum);
2adf6da8 66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 67static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
617ba13b 72static int ext4_sync_fs(struct super_block *sb, int wait);
06a407f1 73static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
27dd4385 86static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 87
2035e776
TT		 88#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95};
7f78e035 96MODULE_ALIAS_FS("ext2");
fa7614dd 97MODULE_ALIAS("ext2");
2035e776
TT		 98#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
99#else
100#define IS_EXT2_SB(sb) (0)
101#endif
102
103
ba69f9ab
JK		 104#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
105static struct file_system_type ext3_fs_type = {
106 .owner = THIS_MODULE,
107 .name = "ext3",
152a0836 108 .mount = ext4_mount,
ba69f9ab
JK		 109 .kill_sb = kill_block_super,
110 .fs_flags = FS_REQUIRES_DEV,
111};
7f78e035 112MODULE_ALIAS_FS("ext3");
fa7614dd 113MODULE_ALIAS("ext3");
ba69f9ab
JK		 114#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
115#else
116#define IS_EXT3_SB(sb) (0)
117#endif
bd81d8ee 118
d25425f8
DW		 119static int ext4_verify_csum_type(struct super_block *sb,
120 struct ext4_super_block *es)
121{
122 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
123 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
124 return 1;
125
126 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
127}
128
a9c47317
DW		 129static __le32 ext4_superblock_csum(struct super_block *sb,
130 struct ext4_super_block *es)
131{
132 struct ext4_sb_info *sbi = EXT4_SB(sb);
133 int offset = offsetof(struct ext4_super_block, s_checksum);
134 __u32 csum;
135
136 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
137
138 return cpu_to_le32(csum);
139}
140
141int ext4_superblock_csum_verify(struct super_block *sb,
142 struct ext4_super_block *es)
143{
144 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
145 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
146 return 1;
147
148 return es->s_checksum == ext4_superblock_csum(sb, es);
149}
150
06db49e6 151void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 152{
06db49e6
TT		 153 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
154
a9c47317
DW		 155 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
156 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
157 return;
158
159 es->s_checksum = ext4_superblock_csum(sb, es);
160}
161
9933fc0a
TT		 162void *ext4_kvmalloc(size_t size, gfp_t flags)
163{
164 void *ret;
165
8be04b93 166 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 167 if (!ret)
168 ret = __vmalloc(size, flags, PAGE_KERNEL);
169 return ret;
170}
171
172void *ext4_kvzalloc(size_t size, gfp_t flags)
173{
174 void *ret;
175
8be04b93 176 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 177 if (!ret)
178 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
179 return ret;
180}
181
182void ext4_kvfree(void *ptr)
183{
184 if (is_vmalloc_addr(ptr))
185 vfree(ptr);
186 else
187 kfree(ptr);
188
189}
190
8fadc143
AR		 191ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
192 struct ext4_group_desc *bg)
bd81d8ee 193{
3a14589c 194 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 195 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 196 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 197}
198
8fadc143
AR		 199ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
200 struct ext4_group_desc *bg)
bd81d8ee 201{
5272f837 202 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 203 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 204 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 205}
206
8fadc143
AR		 207ext4_fsblk_t ext4_inode_table(struct super_block *sb,
208 struct ext4_group_desc *bg)
bd81d8ee 209{
5272f837 210 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 211 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 212 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 213}
214
021b65bb
TT		 215__u32 ext4_free_group_clusters(struct super_block *sb,
216 struct ext4_group_desc *bg)
560671a0
AK		 217{
218 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
219 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 220 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 221}
222
223__u32 ext4_free_inodes_count(struct super_block *sb,
224 struct ext4_group_desc *bg)
225{
226 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
227 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 228 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 229}
230
231__u32 ext4_used_dirs_count(struct super_block *sb,
232 struct ext4_group_desc *bg)
233{
234 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
235 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 236 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 237}
238
239__u32 ext4_itable_unused_count(struct super_block *sb,
240 struct ext4_group_desc *bg)
241{
242 return le16_to_cpu(bg->bg_itable_unused_lo) |
243 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 244 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 245}
246
8fadc143
AR		 247void ext4_block_bitmap_set(struct super_block *sb,
248 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 249{
3a14589c 250 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 251 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
252 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 253}
254
8fadc143
AR		 255void ext4_inode_bitmap_set(struct super_block *sb,
256 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 257{
5272f837 258 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 259 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
260 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 261}
262
8fadc143
AR		 263void ext4_inode_table_set(struct super_block *sb,
264 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 265{
5272f837 266 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 267 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
268 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 269}
270
021b65bb
TT		 271void ext4_free_group_clusters_set(struct super_block *sb,
272 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 273{
274 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
275 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
276 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
277}
278
279void ext4_free_inodes_set(struct super_block *sb,
280 struct ext4_group_desc *bg, __u32 count)
281{
282 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
283 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
284 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
285}
286
287void ext4_used_dirs_set(struct super_block *sb,
288 struct ext4_group_desc *bg, __u32 count)
289{
290 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
291 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
292 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
293}
294
295void ext4_itable_unused_set(struct super_block *sb,
296 struct ext4_group_desc *bg, __u32 count)
297{
298 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
299 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
300 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
301}
302
d3d1faf6 303
1c13d5c0
TT		 304static void __save_error_info(struct super_block *sb, const char *func,
305 unsigned int line)
306{
307 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
308
309 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
310 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
311 es->s_last_error_time = cpu_to_le32(get_seconds());
312 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
313 es->s_last_error_line = cpu_to_le32(line);
314 if (!es->s_first_error_time) {
315 es->s_first_error_time = es->s_last_error_time;
316 strncpy(es->s_first_error_func, func,
317 sizeof(es->s_first_error_func));
318 es->s_first_error_line = cpu_to_le32(line);
319 es->s_first_error_ino = es->s_last_error_ino;
320 es->s_first_error_block = es->s_last_error_block;
321 }
66e61a9e
TT		 322 /*
323 * Start the daily error reporting function if it hasn't been
324 * started already
325 */
326 if (!es->s_error_count)
327 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 328 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 329}
330
331static void save_error_info(struct super_block *sb, const char *func,
332 unsigned int line)
333{
334 __save_error_info(sb, func, line);
335 ext4_commit_super(sb, 1);
336}
337
7c2e7087
TT		 338/*
339 * The del_gendisk() function uninitializes the disk-specific data
340 * structures, including the bdi structure, without telling anyone
341 * else. Once this happens, any attempt to call mark_buffer_dirty()
342 * (for example, by ext4_commit_super), will cause a kernel OOPS.
343 * This is a kludge to prevent these oops until we can put in a proper
344 * hook in del_gendisk() to inform the VFS and file system layers.
345 */
346static int block_device_ejected(struct super_block *sb)
347{
348 struct inode *bd_inode = sb->s_bdev->bd_inode;
349 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
350
351 return bdi->dev == NULL;
352}
353
18aadd47
BJ		 354static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
355{
356 struct super_block *sb = journal->j_private;
357 struct ext4_sb_info *sbi = EXT4_SB(sb);
358 int error = is_journal_aborted(journal);
5d3ee208 359 struct ext4_journal_cb_entry *jce;
18aadd47 360
5d3ee208 361 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 362 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 363 while (!list_empty(&txn->t_private_list)) {
364 jce = list_entry(txn->t_private_list.next,
365 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 366 list_del_init(&jce->jce_list);
367 spin_unlock(&sbi->s_md_lock);
368 jce->jce_func(sb, jce, error);
369 spin_lock(&sbi->s_md_lock);
370 }
371 spin_unlock(&sbi->s_md_lock);
372}
1c13d5c0 373
ac27a0ec
DK		 374/* Deal with the reporting of failure conditions on a filesystem such as
375 * inconsistencies detected or read IO failures.
376 *
377 * On ext2, we can store the error state of the filesystem in the
617ba13b 378 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 379 * write ordering constraints on the superblock which prevent us from
380 * writing it out straight away; and given that the journal is about to
381 * be aborted, we can't rely on the current, or future, transactions to
382 * write out the superblock safely.
383 *
dab291af 384 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 385 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 386 * that error until we've noted it down and cleared it.
387 */
388
617ba13b 389static void ext4_handle_error(struct super_block *sb)
ac27a0ec 390{
ac27a0ec
DK		 391 if (sb->s_flags & MS_RDONLY)
392 return;
393
2b2d6d01 394 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 395 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 396
4ab2f15b 397 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 398 if (journal)
dab291af 399 jbd2_journal_abort(journal, -EIO);
ac27a0ec 400 }
2b2d6d01 401 if (test_opt(sb, ERRORS_RO)) {
b31e1552 402 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 403 /*
404 * Make sure updated value of ->s_mount_flags will be visible
405 * before ->s_flags update
406 */
407 smp_wmb();
ac27a0ec
DK		 408 sb->s_flags |= MS_RDONLY;
409 }
ac27a0ec 410 if (test_opt(sb, ERRORS_PANIC))
617ba13b 411 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 412 sb->s_id);
413}
414
efbed4dc
TT		 415#define ext4_error_ratelimit(sb) \
416 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
417 "EXT4-fs error")
418
12062ddd 419void __ext4_error(struct super_block *sb, const char *function,
c398eda0 420 unsigned int line, const char *fmt, ...)
ac27a0ec 421{
0ff2ea7d 422 struct va_format vaf;
ac27a0ec
DK		 423 va_list args;
424
efbed4dc
TT		 425 if (ext4_error_ratelimit(sb)) {
426 va_start(args, fmt);
427 vaf.fmt = fmt;
428 vaf.va = &args;
429 printk(KERN_CRIT
430 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
431 sb->s_id, function, line, current->comm, &vaf);
432 va_end(args);
433 }
f3fc0210 434 save_error_info(sb, function, line);
617ba13b 435 ext4_handle_error(sb);
ac27a0ec
DK		 436}
437
e7c96e8e
JP		 438void __ext4_error_inode(struct inode *inode, const char *function,
439 unsigned int line, ext4_fsblk_t block,
440 const char *fmt, ...)
273df556
FM		 441{
442 va_list args;
f7c21177 443 struct va_format vaf;
1c13d5c0 444 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 445
1c13d5c0
TT		 446 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
447 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 448 if (ext4_error_ratelimit(inode->i_sb)) {
449 va_start(args, fmt);
450 vaf.fmt = fmt;
451 vaf.va = &args;
452 if (block)
453 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
454 "inode #%lu: block %llu: comm %s: %pV\n",
455 inode->i_sb->s_id, function, line, inode->i_ino,
456 block, current->comm, &vaf);
457 else
458 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
459 "inode #%lu: comm %s: %pV\n",
460 inode->i_sb->s_id, function, line, inode->i_ino,
461 current->comm, &vaf);
462 va_end(args);
463 }
1c13d5c0 464 save_error_info(inode->i_sb, function, line);
273df556
FM		 465 ext4_handle_error(inode->i_sb);
466}
467
e7c96e8e
JP		 468void __ext4_error_file(struct file *file, const char *function,
469 unsigned int line, ext4_fsblk_t block,
470 const char *fmt, ...)
273df556
FM		 471{
472 va_list args;
f7c21177 473 struct va_format vaf;
1c13d5c0 474 struct ext4_super_block *es;
496ad9aa 475 struct inode *inode = file_inode(file);
273df556
FM		 476 char pathname[80], *path;
477
1c13d5c0
TT		 478 es = EXT4_SB(inode->i_sb)->s_es;
479 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc
TT		 480 if (ext4_error_ratelimit(inode->i_sb)) {
481 path = d_path(&(file->f_path), pathname, sizeof(pathname));
482 if (IS_ERR(path))
483 path = "(unknown)";
484 va_start(args, fmt);
485 vaf.fmt = fmt;
486 vaf.va = &args;
487 if (block)
488 printk(KERN_CRIT
489 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
490 "block %llu: comm %s: path %s: %pV\n",
491 inode->i_sb->s_id, function, line, inode->i_ino,
492 block, current->comm, path, &vaf);
493 else
494 printk(KERN_CRIT
495 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
496 "comm %s: path %s: %pV\n",
497 inode->i_sb->s_id, function, line, inode->i_ino,
498 current->comm, path, &vaf);
499 va_end(args);
500 }
1c13d5c0 501 save_error_info(inode->i_sb, function, line);
273df556
FM		 502 ext4_handle_error(inode->i_sb);
503}
504
722887dd
TT		 505const char *ext4_decode_error(struct super_block *sb, int errno,
506 char nbuf[16])
ac27a0ec
DK		 507{
508 char *errstr = NULL;
509
510 switch (errno) {
511 case -EIO:
512 errstr = "IO failure";
513 break;
514 case -ENOMEM:
515 errstr = "Out of memory";
516 break;
517 case -EROFS:
78f1ddbb
TT		 518 if (!sb || (EXT4_SB(sb)->s_journal &&
519 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 520 errstr = "Journal has aborted";
521 else
522 errstr = "Readonly filesystem";
523 break;
524 default:
525 /* If the caller passed in an extra buffer for unknown
526 * errors, textualise them now. Else we just return
527 * NULL. */
528 if (nbuf) {
529 /* Check for truncated error codes... */
530 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
531 errstr = nbuf;
532 }
533 break;
534 }
535
536 return errstr;
537}
538
617ba13b 539/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 540 * automatically and invokes the appropriate error response. */
541
c398eda0
TT		 542void __ext4_std_error(struct super_block *sb, const char *function,
543 unsigned int line, int errno)
ac27a0ec
DK		 544{
545 char nbuf[16];
546 const char *errstr;
547
548 /* Special case: if the error is EROFS, and we're not already
549 * inside a transaction, then there's really no point in logging
550 * an error. */
551 if (errno == -EROFS && journal_current_handle() == NULL &&
552 (sb->s_flags & MS_RDONLY))
553 return;
554
efbed4dc
TT		 555 if (ext4_error_ratelimit(sb)) {
556 errstr = ext4_decode_error(sb, errno, nbuf);
557 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
558 sb->s_id, function, line, errstr);
559 }
ac27a0ec 560
efbed4dc 561 save_error_info(sb, function, line);
617ba13b 562 ext4_handle_error(sb);
ac27a0ec
DK		 563}
564
565/*
617ba13b 566 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 567 * abort function may be used to deal with unrecoverable failures such
568 * as journal IO errors or ENOMEM at a critical moment in log management.
569 *
570 * We unconditionally force the filesystem into an ABORT|READONLY state,
571 * unless the error response on the fs has been set to panic in which
572 * case we take the easy way out and panic immediately.
573 */
574
c67d859e 575void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 576 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 577{
578 va_list args;
579
1c13d5c0 580 save_error_info(sb, function, line);
ac27a0ec 581 va_start(args, fmt);
c398eda0
TT		 582 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
583 function, line);
ac27a0ec
DK		 584 vprintk(fmt, args);
585 printk("\n");
586 va_end(args);
587
1c13d5c0
TT		 588 if ((sb->s_flags & MS_RDONLY) == 0) {
589 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 590 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 591 /*
592 * Make sure updated value of ->s_mount_flags will be visible
593 * before ->s_flags update
594 */
595 smp_wmb();
596 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 597 if (EXT4_SB(sb)->s_journal)
598 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
599 save_error_info(sb, function, line);
600 }
ac27a0ec 601 if (test_opt(sb, ERRORS_PANIC))
617ba13b 602 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 603}
604
e7c96e8e
JP		 605void __ext4_msg(struct super_block *sb,
606 const char *prefix, const char *fmt, ...)
b31e1552 607{
0ff2ea7d 608 struct va_format vaf;
b31e1552
ES		 609 va_list args;
610
efbed4dc
TT		 611 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
612 return;
613
b31e1552 614 va_start(args, fmt);
0ff2ea7d
JP		 615 vaf.fmt = fmt;
616 vaf.va = &args;
617 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 618 va_end(args);
619}
620
12062ddd 621void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 622 unsigned int line, const char *fmt, ...)
ac27a0ec 623{
0ff2ea7d 624 struct va_format vaf;
ac27a0ec
DK		 625 va_list args;
626
efbed4dc
TT		 627 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
628 "EXT4-fs warning"))
629 return;
630
ac27a0ec 631 va_start(args, fmt);
0ff2ea7d
JP		 632 vaf.fmt = fmt;
633 vaf.va = &args;
634 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
635 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 636 va_end(args);
637}
638
e29136f8
TT		 639void __ext4_grp_locked_error(const char *function, unsigned int line,
640 struct super_block *sb, ext4_group_t grp,
641 unsigned long ino, ext4_fsblk_t block,
642 const char *fmt, ...)
5d1b1b3f
AK		 643__releases(bitlock)
644__acquires(bitlock)
645{
0ff2ea7d 646 struct va_format vaf;
5d1b1b3f
AK		 647 va_list args;
648 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
649
1c13d5c0
TT		 650 es->s_last_error_ino = cpu_to_le32(ino);
651 es->s_last_error_block = cpu_to_le64(block);
652 __save_error_info(sb, function, line);
0ff2ea7d 653
efbed4dc
TT		 654 if (ext4_error_ratelimit(sb)) {
655 va_start(args, fmt);
656 vaf.fmt = fmt;
657 vaf.va = &args;
658 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
659 sb->s_id, function, line, grp);
660 if (ino)
661 printk(KERN_CONT "inode %lu: ", ino);
662 if (block)
663 printk(KERN_CONT "block %llu:",
664 (unsigned long long) block);
665 printk(KERN_CONT "%pV\n", &vaf);
666 va_end(args);
667 }
5d1b1b3f
AK		 668
669 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 670 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 671 return;
672 }
1c13d5c0 673
5d1b1b3f
AK		 674 ext4_unlock_group(sb, grp);
675 ext4_handle_error(sb);
676 /*
677 * We only get here in the ERRORS_RO case; relocking the group
678 * may be dangerous, but nothing bad will happen since the
679 * filesystem will have already been marked read/only and the
680 * journal has been aborted. We return 1 as a hint to callers
681 * who might what to use the return value from
25985edc 682 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 683 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
684 * aggressively from the ext4 function in question, with a
685 * more appropriate error code.
686 */
687 ext4_lock_group(sb, grp);
688 return;
689}
690
617ba13b 691void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 692{
617ba13b 693 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 694
617ba13b 695 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 696 return;
697
12062ddd 698 ext4_warning(sb,
ac27a0ec
DK		 699 "updating to rev %d because of new feature flag, "
700 "running e2fsck is recommended",
617ba13b 701 EXT4_DYNAMIC_REV);
ac27a0ec 702
617ba13b
MC		 703 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
704 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
705 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 706 /* leave es->s_feature_*compat flags alone */
707 /* es->s_uuid will be set by e2fsck if empty */
708
709 /*
710 * The rest of the superblock fields should be zero, and if not it
711 * means they are likely already in use, so leave them alone. We
712 * can leave it up to e2fsck to clean up any inconsistencies there.
713 */
714}
715
716/*
717 * Open the external journal device
718 */
b31e1552 719static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 720{
721 struct block_device *bdev;
722 char b[BDEVNAME_SIZE];
723
d4d77629 724 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 725 if (IS_ERR(bdev))
726 goto fail;
727 return bdev;
728
729fail:
b31e1552 730 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 731 __bdevname(dev, b), PTR_ERR(bdev));
732 return NULL;
733}
734
735/*
736 * Release the journal device
737 */
4385bab1 738static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 739{
4385bab1 740 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 741}
742
4385bab1 743static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 744{
745 struct block_device *bdev;
ac27a0ec
DK		 746 bdev = sbi->journal_bdev;
747 if (bdev) {
4385bab1 748 ext4_blkdev_put(bdev);
ac27a0ec
DK		 749 sbi->journal_bdev = NULL;
750 }
ac27a0ec
DK		 751}
752
753static inline struct inode *orphan_list_entry(struct list_head *l)
754{
617ba13b 755 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 756}
757
617ba13b 758static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 759{
760 struct list_head *l;
761
b31e1552
ES		 762 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
763 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 764
765 printk(KERN_ERR "sb_info orphan list:\n");
766 list_for_each(l, &sbi->s_orphan) {
767 struct inode *inode = orphan_list_entry(l);
768 printk(KERN_ERR " "
769 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
770 inode->i_sb->s_id, inode->i_ino, inode,
771 inode->i_mode, inode->i_nlink,
772 NEXT_ORPHAN(inode));
773 }
774}
775
2b2d6d01 776static void ext4_put_super(struct super_block *sb)
ac27a0ec 777{
617ba13b
MC		 778 struct ext4_sb_info *sbi = EXT4_SB(sb);
779 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 780 int i, err;
ac27a0ec 781
857ac889 782 ext4_unregister_li_request(sb);
e0ccfd95
CH		 783 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
784
2e8fa54e 785 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 786 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 787
0390131b
FM		 788 if (sbi->s_journal) {
789 err = jbd2_journal_destroy(sbi->s_journal);
790 sbi->s_journal = NULL;
791 if (err < 0)
c67d859e 792 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 793 }
d4edac31 794
d3922a77 795 ext4_es_unregister_shrinker(sbi);
9105bb14 796 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 797 ext4_release_system_zone(sb);
798 ext4_mb_release(sb);
799 ext4_ext_release(sb);
800 ext4_xattr_put_super(sb);
801
ac27a0ec 802 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 803 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 804 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 805 }
58c5873a 806 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 807 ext4_commit_super(sb, 1);
808
240799cd 809 if (sbi->s_proc) {
66acdcf4 810 remove_proc_entry("options", sbi->s_proc);
9f6200bb 811 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 812 }
3197ebdb 813 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 814
815 for (i = 0; i < sbi->s_gdb_count; i++)
816 brelse(sbi->s_group_desc[i]);
f18a5f21 817 ext4_kvfree(sbi->s_group_desc);
9933fc0a 818 ext4_kvfree(sbi->s_flex_groups);
57042651 819 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 820 percpu_counter_destroy(&sbi->s_freeinodes_counter);
821 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 822 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 823 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
ac27a0ec
DK		 824 brelse(sbi->s_sbh);
825#ifdef CONFIG_QUOTA
826 for (i = 0; i < MAXQUOTAS; i++)
827 kfree(sbi->s_qf_names[i]);
828#endif
829
830 /* Debugging code just in case the in-memory inode orphan list
831 * isn't empty. The on-disk one can be non-empty if we've
832 * detected an error and taken the fs readonly, but the
833 * in-memory list had better be clean by this point. */
834 if (!list_empty(&sbi->s_orphan))
835 dump_orphan_list(sb, sbi);
836 J_ASSERT(list_empty(&sbi->s_orphan));
837
f98393a6 838 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 839 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
840 /*
841 * Invalidate the journal device's buffers. We don't want them
842 * floating about in memory - the physical journal device may
843 * hotswapped, and it breaks the `ro-after' testing code.
844 */
845 sync_blockdev(sbi->journal_bdev);
f98393a6 846 invalidate_bdev(sbi->journal_bdev);
617ba13b 847 ext4_blkdev_remove(sbi);
ac27a0ec 848 }
9c191f70
M		 849 if (sbi->s_mb_cache) {
850 ext4_xattr_destroy_cache(sbi->s_mb_cache);
851 sbi->s_mb_cache = NULL;
852 }
c5e06d10
JL		 853 if (sbi->s_mmp_tsk)
854 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 855 sb->s_fs_info = NULL;
3197ebdb
TT		 856 /*
857 * Now that we are completely done shutting down the
858 * superblock, we need to actually destroy the kobject.
859 */
3197ebdb
TT		 860 kobject_put(&sbi->s_kobj);
861 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 862 if (sbi->s_chksum_driver)
863 crypto_free_shash(sbi->s_chksum_driver);
705895b6 864 kfree(sbi->s_blockgroup_lock);
ac27a0ec 865 kfree(sbi);
ac27a0ec
DK		 866}
867
e18b890b 868static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 869
870/*
871 * Called inside transaction, so use GFP_NOFS
872 */
617ba13b 873static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 874{
617ba13b 875 struct ext4_inode_info *ei;
ac27a0ec 876
e6b4f8da 877 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 878 if (!ei)
879 return NULL;
0b8e58a1 880
ac27a0ec 881 ei->vfs_inode.i_version = 1;
c9de560d
AT		 882 INIT_LIST_HEAD(&ei->i_prealloc_list);
883 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 884 ext4_es_init_tree(&ei->i_es_tree);
885 rwlock_init(&ei->i_es_lock);
74cd15cd
ZL		 886 INIT_LIST_HEAD(&ei->i_es_lru);
887 ei->i_es_lru_nr = 0;
d3922a77 888 ei->i_touch_when = 0;
d2a17637
MC		 889 ei->i_reserved_data_blocks = 0;
890 ei->i_reserved_meta_blocks = 0;
891 ei->i_allocated_meta_blocks = 0;
9d0be502 892 ei->i_da_metadata_calc_len = 0;
7e731bc9 893 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 894 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 895#ifdef CONFIG_QUOTA
896 ei->i_reserved_quota = 0;
897#endif
8aefcd55 898 ei->jinode = NULL;
2e8fa54e 899 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 900 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 901 ei->i_sync_tid = 0;
902 ei->i_datasync_tid = 0;
f7ad6d2e 903 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 904 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 905 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
0b8e58a1 906
ac27a0ec
DK		 907 return &ei->vfs_inode;
908}
909
7ff9c073
TT		 910static int ext4_drop_inode(struct inode *inode)
911{
912 int drop = generic_drop_inode(inode);
913
914 trace_ext4_drop_inode(inode, drop);
915 return drop;
916}
917
fa0d7e3d
NP		 918static void ext4_i_callback(struct rcu_head *head)
919{
920 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 921 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
922}
923
617ba13b 924static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 925{
9f7dd93d 926 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 927 ext4_msg(inode->i_sb, KERN_ERR,
928 "Inode %lu (%p): orphan list check failed!",
929 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 930 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
931 EXT4_I(inode), sizeof(struct ext4_inode_info),
932 true);
933 dump_stack();
934 }
fa0d7e3d 935 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 936}
937
51cc5068 938static void init_once(void *foo)
ac27a0ec 939{
617ba13b 940 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 941
a35afb83 942 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 943 init_rwsem(&ei->xattr_sem);
0e855ac8 944 init_rwsem(&ei->i_data_sem);
a35afb83 945 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 946}
947
e67bc2b3 948static int __init init_inodecache(void)
ac27a0ec 949{
617ba13b
MC		 950 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
951 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 952 0, (SLAB_RECLAIM_ACCOUNT|
953 SLAB_MEM_SPREAD),
20c2df83 954 init_once);
617ba13b 955 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 956 return -ENOMEM;
957 return 0;
958}
959
960static void destroy_inodecache(void)
961{
8c0a8537
KS		 962 /*
963 * Make sure all delayed rcu free inodes are flushed before we
964 * destroy cache.
965 */
966 rcu_barrier();
617ba13b 967 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 968}
969
0930fcc1 970void ext4_clear_inode(struct inode *inode)
ac27a0ec 971{
0930fcc1 972 invalidate_inode_buffers(inode);
dbd5768f 973 clear_inode(inode);
9f754758 974 dquot_drop(inode);
c2ea3fde 975 ext4_discard_preallocations(inode);
51865fda 976 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
74cd15cd 977 ext4_es_lru_del(inode);
8aefcd55
TT		 978 if (EXT4_I(inode)->jinode) {
979 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
980 EXT4_I(inode)->jinode);
981 jbd2_free_inode(EXT4_I(inode)->jinode);
982 EXT4_I(inode)->jinode = NULL;
983 }
ac27a0ec
DK		 984}
985
1b961ac0 986static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 987 u64 ino, u32 generation)
ac27a0ec 988{
ac27a0ec 989 struct inode *inode;
ac27a0ec 990
617ba13b 991 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 992 return ERR_PTR(-ESTALE);
617ba13b 993 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 994 return ERR_PTR(-ESTALE);
995
996 /* iget isn't really right if the inode is currently unallocated!!
997 *
617ba13b 998 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 999 * deleted, so we should be safe.
1000 *
1001 * Currently we don't know the generation for parent directory, so
1002 * a generation of 0 means "accept any"
1003 */
1d1fe1ee
DH		 1004 inode = ext4_iget(sb, ino);
1005 if (IS_ERR(inode))
1006 return ERR_CAST(inode);
1007 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1008 iput(inode);
1009 return ERR_PTR(-ESTALE);
1010 }
1b961ac0
CH		 1011
1012 return inode;
1013}
1014
1015static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1016 int fh_len, int fh_type)
1b961ac0
CH		 1017{
1018 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1019 ext4_nfs_get_inode);
1020}
1021
1022static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1023 int fh_len, int fh_type)
1b961ac0
CH		 1024{
1025 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1026 ext4_nfs_get_inode);
ac27a0ec
DK		 1027}
1028
c39a7f84
TO		 1029/*
1030 * Try to release metadata pages (indirect blocks, directories) which are
1031 * mapped via the block device. Since these pages could have journal heads
1032 * which would prevent try_to_free_buffers() from freeing them, we must use
1033 * jbd2 layer's try_to_free_buffers() function to release them.
1034 */
0b8e58a1
AD		 1035static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1036 gfp_t wait)
c39a7f84
TO		 1037{
1038 journal_t *journal = EXT4_SB(sb)->s_journal;
1039
1040 WARN_ON(PageChecked(page));
1041 if (!page_has_buffers(page))
1042 return 0;
1043 if (journal)
1044 return jbd2_journal_try_to_free_buffers(journal, page,
1045 wait & ~__GFP_WAIT);
1046 return try_to_free_buffers(page);
1047}
1048
ac27a0ec 1049#ifdef CONFIG_QUOTA
af5bc92d 1050#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1051#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1052
617ba13b
MC		 1053static int ext4_write_dquot(struct dquot *dquot);
1054static int ext4_acquire_dquot(struct dquot *dquot);
1055static int ext4_release_dquot(struct dquot *dquot);
1056static int ext4_mark_dquot_dirty(struct dquot *dquot);
1057static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1058static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1059 struct path *path);
7c319d32
AK		 1060static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1061 int format_id);
ca0e05e4 1062static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1063static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1064static int ext4_quota_on_mount(struct super_block *sb, int type);
1065static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1066 size_t len, loff_t off);
617ba13b 1067static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1068 const char *data, size_t len, loff_t off);
7c319d32
AK		 1069static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1070 unsigned int flags);
1071static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1072
61e225dc 1073static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1074 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1075 .write_dquot = ext4_write_dquot,
1076 .acquire_dquot = ext4_acquire_dquot,
1077 .release_dquot = ext4_release_dquot,
1078 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1079 .write_info = ext4_write_info,
1080 .alloc_dquot = dquot_alloc,
1081 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1082};
1083
0d54b217 1084static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1085 .quota_on = ext4_quota_on,
ca0e05e4 1086 .quota_off = ext4_quota_off,
287a8095
CH		 1087 .quota_sync = dquot_quota_sync,
1088 .get_info = dquot_get_dqinfo,
1089 .set_info = dquot_set_dqinfo,
1090 .get_dqblk = dquot_get_dqblk,
1091 .set_dqblk = dquot_set_dqblk
ac27a0ec 1092};
7c319d32
AK		 1093
1094static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1095 .quota_on_meta = ext4_quota_on_sysfile,
1096 .quota_off = ext4_quota_off_sysfile,
1097 .quota_sync = dquot_quota_sync,
1098 .get_info = dquot_get_dqinfo,
1099 .set_info = dquot_set_dqinfo,
1100 .get_dqblk = dquot_get_dqblk,
1101 .set_dqblk = dquot_set_dqblk
1102};
ac27a0ec
DK		 1103#endif
1104
ee9b6d61 1105static const struct super_operations ext4_sops = {
617ba13b
MC		 1106 .alloc_inode = ext4_alloc_inode,
1107 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1108 .write_inode = ext4_write_inode,
1109 .dirty_inode = ext4_dirty_inode,
7ff9c073 1110 .drop_inode = ext4_drop_inode,
0930fcc1 1111 .evict_inode = ext4_evict_inode,
617ba13b 1112 .put_super = ext4_put_super,
617ba13b 1113 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1114 .freeze_fs = ext4_freeze,
1115 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1116 .statfs = ext4_statfs,
1117 .remount_fs = ext4_remount,
617ba13b 1118 .show_options = ext4_show_options,
ac27a0ec 1119#ifdef CONFIG_QUOTA
617ba13b
MC		 1120 .quota_read = ext4_quota_read,
1121 .quota_write = ext4_quota_write,
ac27a0ec 1122#endif
c39a7f84 1123 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1124};
1125
9ca92389
TT		 1126static const struct super_operations ext4_nojournal_sops = {
1127 .alloc_inode = ext4_alloc_inode,
1128 .destroy_inode = ext4_destroy_inode,
1129 .write_inode = ext4_write_inode,
1130 .dirty_inode = ext4_dirty_inode,
7ff9c073 1131 .drop_inode = ext4_drop_inode,
0930fcc1 1132 .evict_inode = ext4_evict_inode,
06a407f1 1133 .sync_fs = ext4_sync_fs_nojournal,
9ca92389
TT		 1134 .put_super = ext4_put_super,
1135 .statfs = ext4_statfs,
1136 .remount_fs = ext4_remount,
9ca92389
TT		 1137 .show_options = ext4_show_options,
1138#ifdef CONFIG_QUOTA
1139 .quota_read = ext4_quota_read,
1140 .quota_write = ext4_quota_write,
1141#endif
1142 .bdev_try_to_free_page = bdev_try_to_free_page,
1143};
1144
39655164 1145static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1146 .fh_to_dentry = ext4_fh_to_dentry,
1147 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1148 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1149};
1150
1151enum {
1152 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1153 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1154 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1155 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1156 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1157 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1158 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1159 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1160 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1161 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1162 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1163 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1164 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1165 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1166 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1167 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1168 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1169 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1170 Opt_max_dir_size_kb,
ac27a0ec
DK		 1171};
1172
a447c093 1173static const match_table_t tokens = {
ac27a0ec
DK		 1174 {Opt_bsd_df, "bsddf"},
1175 {Opt_minix_df, "minixdf"},
1176 {Opt_grpid, "grpid"},
1177 {Opt_grpid, "bsdgroups"},
1178 {Opt_nogrpid, "nogrpid"},
1179 {Opt_nogrpid, "sysvgroups"},
1180 {Opt_resgid, "resgid=%u"},
1181 {Opt_resuid, "resuid=%u"},
1182 {Opt_sb, "sb=%u"},
1183 {Opt_err_cont, "errors=continue"},
1184 {Opt_err_panic, "errors=panic"},
1185 {Opt_err_ro, "errors=remount-ro"},
1186 {Opt_nouid32, "nouid32"},
ac27a0ec 1187 {Opt_debug, "debug"},
72578c33
TT		 1188 {Opt_removed, "oldalloc"},
1189 {Opt_removed, "orlov"},
ac27a0ec
DK		 1190 {Opt_user_xattr, "user_xattr"},
1191 {Opt_nouser_xattr, "nouser_xattr"},
1192 {Opt_acl, "acl"},
1193 {Opt_noacl, "noacl"},
e3bb52ae 1194 {Opt_noload, "norecovery"},
5a916be1 1195 {Opt_noload, "noload"},
72578c33
TT		 1196 {Opt_removed, "nobh"},
1197 {Opt_removed, "bh"},
ac27a0ec 1198 {Opt_commit, "commit=%u"},
30773840
TT		 1199 {Opt_min_batch_time, "min_batch_time=%u"},
1200 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1201 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1202 {Opt_journal_path, "journal_path=%s"},
818d276c
GS		 1203 {Opt_journal_checksum, "journal_checksum"},
1204 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1205 {Opt_abort, "abort"},
1206 {Opt_data_journal, "data=journal"},
1207 {Opt_data_ordered, "data=ordered"},
1208 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1209 {Opt_data_err_abort, "data_err=abort"},
1210 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1211 {Opt_offusrjquota, "usrjquota="},
1212 {Opt_usrjquota, "usrjquota=%s"},
1213 {Opt_offgrpjquota, "grpjquota="},
1214 {Opt_grpjquota, "grpjquota=%s"},
1215 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1216 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1217 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1218 {Opt_grpquota, "grpquota"},
1219 {Opt_noquota, "noquota"},
1220 {Opt_quota, "quota"},
1221 {Opt_usrquota, "usrquota"},
1222 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1223 {Opt_barrier, "barrier"},
1224 {Opt_nobarrier, "nobarrier"},
25ec56b5 1225 {Opt_i_version, "i_version"},
c9de560d 1226 {Opt_stripe, "stripe=%u"},
64769240 1227 {Opt_delalloc, "delalloc"},
dd919b98 1228 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1229 {Opt_removed, "mblk_io_submit"},
1230 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1231 {Opt_block_validity, "block_validity"},
1232 {Opt_noblock_validity, "noblock_validity"},
240799cd 1233 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1234 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1235 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1236 {Opt_auto_da_alloc, "auto_da_alloc"},
1237 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1238 {Opt_dioread_nolock, "dioread_nolock"},
1239 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1240 {Opt_discard, "discard"},
1241 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1242 {Opt_init_itable, "init_itable=%u"},
1243 {Opt_init_itable, "init_itable"},
1244 {Opt_noinit_itable, "noinit_itable"},
df981d03 1245 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1246 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1247 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1248 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1249 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1250 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1251 {Opt_err, NULL},
ac27a0ec
DK		 1252};
1253
617ba13b 1254static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1255{
617ba13b 1256 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1257 char *options = (char *) *data;
1258
1259 if (!options || strncmp(options, "sb=", 3) != 0)
1260 return 1; /* Default location */
0b8e58a1 1261
ac27a0ec 1262 options += 3;
0b8e58a1 1263 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1264 sb_block = simple_strtoul(options, &options, 0);
1265 if (*options && *options != ',') {
4776004f 1266 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1267 (char *) *data);
1268 return 1;
1269 }
1270 if (*options == ',')
1271 options++;
1272 *data = (void *) options;
0b8e58a1 1273
ac27a0ec
DK		 1274 return sb_block;
1275}
1276
b3881f74 1277#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1278static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1279 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1280
56c50f11
DM		 1281#ifdef CONFIG_QUOTA
1282static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1283{
1284 struct ext4_sb_info *sbi = EXT4_SB(sb);
1285 char *qname;
03dafb5f 1286 int ret = -1;
56c50f11
DM		 1287
1288 if (sb_any_quota_loaded(sb) &&
1289 !sbi->s_qf_names[qtype]) {
1290 ext4_msg(sb, KERN_ERR,
1291 "Cannot change journaled "
1292 "quota options when quota turned on");
57f73c2c 1293 return -1;
56c50f11 1294 }
262b4662
JK		 1295 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1296 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1297 "when QUOTA feature is enabled");
1298 return -1;
1299 }
56c50f11
DM		 1300 qname = match_strdup(args);
1301 if (!qname) {
1302 ext4_msg(sb, KERN_ERR,
1303 "Not enough memory for storing quotafile name");
57f73c2c 1304 return -1;
56c50f11 1305 }
03dafb5f
CG		 1306 if (sbi->s_qf_names[qtype]) {
1307 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1308 ret = 1;
1309 else
1310 ext4_msg(sb, KERN_ERR,
1311 "%s quota file already specified",
1312 QTYPE2NAME(qtype));
1313 goto errout;
56c50f11 1314 }
03dafb5f 1315 if (strchr(qname, '/')) {
56c50f11
DM		 1316 ext4_msg(sb, KERN_ERR,
1317 "quotafile must be on filesystem root");
03dafb5f 1318 goto errout;
56c50f11 1319 }
03dafb5f 1320 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1321 set_opt(sb, QUOTA);
56c50f11 1322 return 1;
03dafb5f
CG		 1323errout:
1324 kfree(qname);
1325 return ret;
56c50f11
DM		 1326}
1327
1328static int clear_qf_name(struct super_block *sb, int qtype)
1329{
1330
1331 struct ext4_sb_info *sbi = EXT4_SB(sb);
1332
1333 if (sb_any_quota_loaded(sb) &&
1334 sbi->s_qf_names[qtype]) {
1335 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1336 " when quota turned on");
57f73c2c 1337 return -1;
56c50f11 1338 }
03dafb5f 1339 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1340 sbi->s_qf_names[qtype] = NULL;
1341 return 1;
1342}
1343#endif
1344
26092bf5
TT		 1345#define MOPT_SET 0x0001
1346#define MOPT_CLEAR 0x0002
1347#define MOPT_NOSUPPORT 0x0004
1348#define MOPT_EXPLICIT 0x0008
1349#define MOPT_CLEAR_ERR 0x0010
1350#define MOPT_GTE0 0x0020
ac27a0ec 1351#ifdef CONFIG_QUOTA
26092bf5
TT		 1352#define MOPT_Q 0
1353#define MOPT_QFMT 0x0040
1354#else
1355#define MOPT_Q MOPT_NOSUPPORT
1356#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1357#endif
26092bf5 1358#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1359#define MOPT_NO_EXT2 0x0100
1360#define MOPT_NO_EXT3 0x0200
1361#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1362#define MOPT_STRING 0x0400
26092bf5
TT		 1363
1364static const struct mount_opts {
1365 int token;
1366 int mount_opt;
1367 int flags;
1368} ext4_mount_opts[] = {
1369 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1370 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1371 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1372 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1373 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1374 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1375 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1376 MOPT_EXT4_ONLY | MOPT_SET},
1377 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1378 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1379 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1380 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1381 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1382 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1383 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1384 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1385 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1386 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1387 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1388 EXT4_MOUNT_JOURNAL_CHECKSUM),
1389 MOPT_EXT4_ONLY | MOPT_SET},
1390 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1391 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1392 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1393 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1394 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1395 MOPT_NO_EXT2 | MOPT_SET},
1396 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1397 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1398 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1399 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1400 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1401 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1402 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1403 {Opt_commit, 0, MOPT_GTE0},
1404 {Opt_max_batch_time, 0, MOPT_GTE0},
1405 {Opt_min_batch_time, 0, MOPT_GTE0},
1406 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1407 {Opt_init_itable, 0, MOPT_GTE0},
1408 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1409 {Opt_resuid, 0, MOPT_GTE0},
1410 {Opt_resgid, 0, MOPT_GTE0},
1411 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1412 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1413 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1414 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1415 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1416 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1417 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1418 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1419 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1420#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1421 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1422 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1423#else
26092bf5
TT		 1424 {Opt_acl, 0, MOPT_NOSUPPORT},
1425 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1426#endif
26092bf5
TT		 1427 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1428 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1429 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1430 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1431 MOPT_SET | MOPT_Q},
1432 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1433 MOPT_SET | MOPT_Q},
1434 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1435 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1436 {Opt_usrjquota, 0, MOPT_Q},
1437 {Opt_grpjquota, 0, MOPT_Q},
1438 {Opt_offusrjquota, 0, MOPT_Q},
1439 {Opt_offgrpjquota, 0, MOPT_Q},
1440 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1441 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1442 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1443 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1444 {Opt_err, 0, 0}
1445};
1446
1447static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1448 substring_t *args, unsigned long *journal_devnum,
1449 unsigned int *journal_ioprio, int is_remount)
1450{
1451 struct ext4_sb_info *sbi = EXT4_SB(sb);
1452 const struct mount_opts *m;
08cefc7a
EB		 1453 kuid_t uid;
1454 kgid_t gid;
26092bf5
TT		 1455 int arg = 0;
1456
57f73c2c
TT		 1457#ifdef CONFIG_QUOTA
1458 if (token == Opt_usrjquota)
1459 return set_qf_name(sb, USRQUOTA, &args[0]);
1460 else if (token == Opt_grpjquota)
1461 return set_qf_name(sb, GRPQUOTA, &args[0]);
1462 else if (token == Opt_offusrjquota)
1463 return clear_qf_name(sb, USRQUOTA);
1464 else if (token == Opt_offgrpjquota)
1465 return clear_qf_name(sb, GRPQUOTA);
1466#endif
26092bf5 1467 switch (token) {
f7048605
TT		 1468 case Opt_noacl:
1469 case Opt_nouser_xattr:
1470 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1471 break;
26092bf5
TT		 1472 case Opt_sb:
1473 return 1; /* handled by get_sb_block() */
1474 case Opt_removed:
5f3633e3 1475 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1476 return 1;
26092bf5
TT		 1477 case Opt_abort:
1478 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1479 return 1;
1480 case Opt_i_version:
1481 sb->s_flags |= MS_I_VERSION;
1482 return 1;
26092bf5
TT		 1483 }
1484
5f3633e3
JK		 1485 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1486 if (token == m->token)
1487 break;
1488
1489 if (m->token == Opt_err) {
1490 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1491 "or missing value", opt);
1492 return -1;
1493 }
1494
8dc0aa8c
TT		 1495 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1496 ext4_msg(sb, KERN_ERR,
1497 "Mount option \"%s\" incompatible with ext2", opt);
1498 return -1;
1499 }
1500 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1501 ext4_msg(sb, KERN_ERR,
1502 "Mount option \"%s\" incompatible with ext3", opt);
1503 return -1;
1504 }
1505
ad4eec61 1506 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1507 return -1;
1508 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1509 return -1;
1510 if (m->flags & MOPT_EXPLICIT)
1511 set_opt2(sb, EXPLICIT_DELALLOC);
1512 if (m->flags & MOPT_CLEAR_ERR)
1513 clear_opt(sb, ERRORS_MASK);
1514 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1515 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1516 "options when quota turned on");
1517 return -1;
1518 }
1519
1520 if (m->flags & MOPT_NOSUPPORT) {
1521 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1522 } else if (token == Opt_commit) {
1523 if (arg == 0)
1524 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1525 sbi->s_commit_interval = HZ * arg;
1526 } else if (token == Opt_max_batch_time) {
1527 if (arg == 0)
1528 arg = EXT4_DEF_MAX_BATCH_TIME;
1529 sbi->s_max_batch_time = arg;
1530 } else if (token == Opt_min_batch_time) {
1531 sbi->s_min_batch_time = arg;
1532 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1533 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1534 ext4_msg(sb, KERN_ERR,
1535 "EXT4-fs: inode_readahead_blks must be "
1536 "0 or a power of 2 smaller than 2^31");
26092bf5 1537 return -1;
5f3633e3
JK		 1538 }
1539 sbi->s_inode_readahead_blks = arg;
1540 } else if (token == Opt_init_itable) {
1541 set_opt(sb, INIT_INODE_TABLE);
1542 if (!args->from)
1543 arg = EXT4_DEF_LI_WAIT_MULT;
1544 sbi->s_li_wait_mult = arg;
1545 } else if (token == Opt_max_dir_size_kb) {
1546 sbi->s_max_dir_size_kb = arg;
1547 } else if (token == Opt_stripe) {
1548 sbi->s_stripe = arg;
1549 } else if (token == Opt_resuid) {
1550 uid = make_kuid(current_user_ns(), arg);
1551 if (!uid_valid(uid)) {
1552 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1553 return -1;
1554 }
5f3633e3
JK		 1555 sbi->s_resuid = uid;
1556 } else if (token == Opt_resgid) {
1557 gid = make_kgid(current_user_ns(), arg);
1558 if (!gid_valid(gid)) {
1559 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1560 return -1;
1561 }
1562 sbi->s_resgid = gid;
1563 } else if (token == Opt_journal_dev) {
1564 if (is_remount) {
1565 ext4_msg(sb, KERN_ERR,
1566 "Cannot specify journal on remount");
1567 return -1;
1568 }
1569 *journal_devnum = arg;
ad4eec61
ES		 1570 } else if (token == Opt_journal_path) {
1571 char *journal_path;
1572 struct inode *journal_inode;
1573 struct path path;
1574 int error;
1575
1576 if (is_remount) {
1577 ext4_msg(sb, KERN_ERR,
1578 "Cannot specify journal on remount");
1579 return -1;
1580 }
1581 journal_path = match_strdup(&args[0]);
1582 if (!journal_path) {
1583 ext4_msg(sb, KERN_ERR, "error: could not dup "
1584 "journal device string");
1585 return -1;
1586 }
1587
1588 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1589 if (error) {
1590 ext4_msg(sb, KERN_ERR, "error: could not find "
1591 "journal device path: error %d", error);
1592 kfree(journal_path);
1593 return -1;
1594 }
1595
1596 journal_inode = path.dentry->d_inode;
1597 if (!S_ISBLK(journal_inode->i_mode)) {
1598 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1599 "is not a block device", journal_path);
1600 path_put(&path);
1601 kfree(journal_path);
1602 return -1;
1603 }
1604
1605 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1606 path_put(&path);
1607 kfree(journal_path);
5f3633e3
JK		 1608 } else if (token == Opt_journal_ioprio) {
1609 if (arg > 7) {
1610 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1611 " (must be 0-7)");
1612 return -1;
1613 }
1614 *journal_ioprio =
1615 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1616 } else if (m->flags & MOPT_DATAJ) {
1617 if (is_remount) {
1618 if (!sbi->s_journal)
1619 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1620 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1621 ext4_msg(sb, KERN_ERR,
26092bf5 1622 "Cannot change data mode on remount");
26092bf5 1623 return -1;
ac27a0ec 1624 }
26092bf5 1625 } else {
5f3633e3
JK		 1626 clear_opt(sb, DATA_FLAGS);
1627 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1628 }
5f3633e3
JK		 1629#ifdef CONFIG_QUOTA
1630 } else if (m->flags & MOPT_QFMT) {
1631 if (sb_any_quota_loaded(sb) &&
1632 sbi->s_jquota_fmt != m->mount_opt) {
1633 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1634 "quota options when quota turned on");
1635 return -1;
1636 }
262b4662
JK		 1637 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1638 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1639 ext4_msg(sb, KERN_ERR,
1640 "Cannot set journaled quota options "
1641 "when QUOTA feature is enabled");
1642 return -1;
1643 }
5f3633e3
JK		 1644 sbi->s_jquota_fmt = m->mount_opt;
1645#endif
1646 } else {
1647 if (!args->from)
1648 arg = 1;
1649 if (m->flags & MOPT_CLEAR)
1650 arg = !arg;
1651 else if (unlikely(!(m->flags & MOPT_SET))) {
1652 ext4_msg(sb, KERN_WARNING,
1653 "buggy handling of option %s", opt);
1654 WARN_ON(1);
1655 return -1;
1656 }
1657 if (arg != 0)
1658 sbi->s_mount_opt |= m->mount_opt;
1659 else
1660 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1661 }
5f3633e3 1662 return 1;
26092bf5
TT		 1663}
1664
1665static int parse_options(char *options, struct super_block *sb,
1666 unsigned long *journal_devnum,
1667 unsigned int *journal_ioprio,
1668 int is_remount)
1669{
1670 struct ext4_sb_info *sbi = EXT4_SB(sb);
1671 char *p;
1672 substring_t args[MAX_OPT_ARGS];
1673 int token;
1674
1675 if (!options)
1676 return 1;
1677
1678 while ((p = strsep(&options, ",")) != NULL) {
1679 if (!*p)
1680 continue;
1681 /*
1682 * Initialize args struct so we know whether arg was
1683 * found; some options take optional arguments.
1684 */
caecd0af 1685 args[0].to = args[0].from = NULL;
26092bf5
TT		 1686 token = match_token(p, tokens, args);
1687 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1688 journal_ioprio, is_remount) < 0)
1689 return 0;
ac27a0ec
DK		 1690 }
1691#ifdef CONFIG_QUOTA
262b4662
JK		 1692 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1693 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1694 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1695 "feature is enabled");
1696 return 0;
1697 }
ac27a0ec 1698 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1699 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1700 clear_opt(sb, USRQUOTA);
ac27a0ec 1701
482a7425 1702 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1703 clear_opt(sb, GRPQUOTA);
ac27a0ec 1704
56c50f11 1705 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1706 ext4_msg(sb, KERN_ERR, "old and new quota "
1707 "format mixing");
ac27a0ec
DK		 1708 return 0;
1709 }
1710
1711 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1712 ext4_msg(sb, KERN_ERR, "journaled quota format "
1713 "not specified");
ac27a0ec
DK		 1714 return 0;
1715 }
1716 } else {
1717 if (sbi->s_jquota_fmt) {
b31e1552 1718 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1719 "specified with no journaling "
b31e1552 1720 "enabled");
ac27a0ec
DK		 1721 return 0;
1722 }
1723 }
1724#endif
261cb20c
JK		 1725 if (test_opt(sb, DIOREAD_NOLOCK)) {
1726 int blocksize =
1727 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1728
1729 if (blocksize < PAGE_CACHE_SIZE) {
1730 ext4_msg(sb, KERN_ERR, "can't mount with "
1731 "dioread_nolock if block size != PAGE_SIZE");
1732 return 0;
1733 }
1734 }
ac27a0ec
DK		 1735 return 1;
1736}
1737
2adf6da8
TT		 1738static inline void ext4_show_quota_options(struct seq_file *seq,
1739 struct super_block *sb)
1740{
1741#if defined(CONFIG_QUOTA)
1742 struct ext4_sb_info *sbi = EXT4_SB(sb);
1743
1744 if (sbi->s_jquota_fmt) {
1745 char *fmtname = "";
1746
1747 switch (sbi->s_jquota_fmt) {
1748 case QFMT_VFS_OLD:
1749 fmtname = "vfsold";
1750 break;
1751 case QFMT_VFS_V0:
1752 fmtname = "vfsv0";
1753 break;
1754 case QFMT_VFS_V1:
1755 fmtname = "vfsv1";
1756 break;
1757 }
1758 seq_printf(seq, ",jqfmt=%s", fmtname);
1759 }
1760
1761 if (sbi->s_qf_names[USRQUOTA])
1762 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1763
1764 if (sbi->s_qf_names[GRPQUOTA])
1765 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1766#endif
1767}
1768
5a916be1
TT		 1769static const char *token2str(int token)
1770{
50df9fd5 1771 const struct match_token *t;
5a916be1
TT		 1772
1773 for (t = tokens; t->token != Opt_err; t++)
1774 if (t->token == token && !strchr(t->pattern, '='))
1775 break;
1776 return t->pattern;
1777}
1778
2adf6da8
TT		 1779/*
1780 * Show an option if
1781 * - it's set to a non-default value OR
1782 * - if the per-sb default is different from the global default
1783 */
66acdcf4
TT		 1784static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1785 int nodefs)
2adf6da8 1786{
2adf6da8
TT		 1787 struct ext4_sb_info *sbi = EXT4_SB(sb);
1788 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1789 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1790 const struct mount_opts *m;
66acdcf4 1791 char sep = nodefs ? '\n' : ',';
2adf6da8 1792
66acdcf4
TT		 1793#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1794#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1795
1796 if (sbi->s_sb_block != 1)
5a916be1
TT		 1797 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1798
1799 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1800 int want_set = m->flags & MOPT_SET;
1801 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1802 (m->flags & MOPT_CLEAR_ERR))
1803 continue;
66acdcf4 1804 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1805 continue; /* skip if same as the default */
1806 if ((want_set &&
1807 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1808 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1809 continue; /* select Opt_noFoo vs Opt_Foo */
1810 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1811 }
5a916be1 1812
08cefc7a 1813 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1814 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1815 SEQ_OPTS_PRINT("resuid=%u",
1816 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1817 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1818 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1819 SEQ_OPTS_PRINT("resgid=%u",
1820 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1821 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1822 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1823 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1824 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1825 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1826 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1827 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1828 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1829 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1830 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1831 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1832 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1833 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1834 if (sb->s_flags & MS_I_VERSION)
5a916be1 1835 SEQ_OPTS_PUTS("i_version");
66acdcf4 1836 if (nodefs || sbi->s_stripe)
5a916be1 1837 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1838 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1839 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1840 SEQ_OPTS_PUTS("data=journal");
1841 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1842 SEQ_OPTS_PUTS("data=ordered");
1843 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1844 SEQ_OPTS_PUTS("data=writeback");
1845 }
66acdcf4
TT		 1846 if (nodefs ||
1847 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1848 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1849 sbi->s_inode_readahead_blks);
2adf6da8 1850
66acdcf4
TT		 1851 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1852 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1853 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1854 if (nodefs || sbi->s_max_dir_size_kb)
1855 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1856
1857 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1858 return 0;
1859}
1860
66acdcf4
TT		 1861static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1862{
1863 return _ext4_show_options(seq, root->d_sb, 0);
1864}
1865
1866static int options_seq_show(struct seq_file *seq, void *offset)
1867{
1868 struct super_block *sb = seq->private;
1869 int rc;
1870
1871 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1872 rc = _ext4_show_options(seq, sb, 1);
1873 seq_puts(seq, "\n");
1874 return rc;
1875}
1876
1877static int options_open_fs(struct inode *inode, struct file *file)
1878{
d9dda78b 1879 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1880}
1881
1882static const struct file_operations ext4_seq_options_fops = {
1883 .owner = THIS_MODULE,
1884 .open = options_open_fs,
1885 .read = seq_read,
1886 .llseek = seq_lseek,
1887 .release = single_release,
1888};
1889
617ba13b 1890static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1891 int read_only)
1892{
617ba13b 1893 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1894 int res = 0;
1895
617ba13b 1896 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1897 ext4_msg(sb, KERN_ERR, "revision level too high, "
1898 "forcing read-only mode");
ac27a0ec
DK		 1899 res = MS_RDONLY;
1900 }
1901 if (read_only)
281b5995 1902 goto done;
617ba13b 1903 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1904 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1905 "running e2fsck is recommended");
617ba13b 1906 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1907 ext4_msg(sb, KERN_WARNING,
1908 "warning: mounting fs with errors, "
1909 "running e2fsck is recommended");
ed3ce80a 1910 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1911 le16_to_cpu(es->s_mnt_count) >=
1912 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1913 ext4_msg(sb, KERN_WARNING,
1914 "warning: maximal mount count reached, "
1915 "running e2fsck is recommended");
ac27a0ec
DK		 1916 else if (le32_to_cpu(es->s_checkinterval) &&
1917 (le32_to_cpu(es->s_lastcheck) +
1918 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1919 ext4_msg(sb, KERN_WARNING,
1920 "warning: checktime reached, "
1921 "running e2fsck is recommended");
0b8e58a1 1922 if (!sbi->s_journal)
0390131b 1923 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1924 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1925 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1926 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1927 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1928 ext4_update_dynamic_rev(sb);
0390131b
FM		 1929 if (sbi->s_journal)
1930 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1931
e2d67052 1932 ext4_commit_super(sb, 1);
281b5995 1933done:
ac27a0ec 1934 if (test_opt(sb, DEBUG))
a9df9a49 1935 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1936 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1937 sb->s_blocksize,
1938 sbi->s_groups_count,
617ba13b
MC		 1939 EXT4_BLOCKS_PER_GROUP(sb),
1940 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1941 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1942
7abc52c2 1943 cleancache_init_fs(sb);
ac27a0ec
DK		 1944 return res;
1945}
1946
117fff10
TT		 1947int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1948{
1949 struct ext4_sb_info *sbi = EXT4_SB(sb);
1950 struct flex_groups *new_groups;
1951 int size;
1952
1953 if (!sbi->s_log_groups_per_flex)
1954 return 0;
1955
1956 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1957 if (size <= sbi->s_flex_groups_allocated)
1958 return 0;
1959
1960 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1961 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1962 if (!new_groups) {
1963 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1964 size / (int) sizeof(struct flex_groups));
1965 return -ENOMEM;
1966 }
1967
1968 if (sbi->s_flex_groups) {
1969 memcpy(new_groups, sbi->s_flex_groups,
1970 (sbi->s_flex_groups_allocated *
1971 sizeof(struct flex_groups)));
1972 ext4_kvfree(sbi->s_flex_groups);
1973 }
1974 sbi->s_flex_groups = new_groups;
1975 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1976 return 0;
1977}
1978
772cb7c8
JS		 1979static int ext4_fill_flex_info(struct super_block *sb)
1980{
1981 struct ext4_sb_info *sbi = EXT4_SB(sb);
1982 struct ext4_group_desc *gdp = NULL;
772cb7c8 1983 ext4_group_t flex_group;
117fff10 1984 int i, err;
772cb7c8 1985
503358ae 1986 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1987 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1988 sbi->s_log_groups_per_flex = 0;
1989 return 1;
1990 }
1991
117fff10
TT		 1992 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1993 if (err)
9933fc0a 1994 goto failed;
772cb7c8 1995
772cb7c8 1996 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1997 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1998
1999 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2000 atomic_add(ext4_free_inodes_count(sb, gdp),
2001 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2002 atomic64_add(ext4_free_group_clusters(sb, gdp),
2003 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2004 atomic_add(ext4_used_dirs_count(sb, gdp),
2005 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2006 }
2007
2008 return 1;
2009failed:
2010 return 0;
2011}
2012
feb0ab32
DW		 2013static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2014 struct ext4_group_desc *gdp)
717d50e4 2015{
feb0ab32 2016 int offset;
717d50e4 2017 __u16 crc = 0;
feb0ab32 2018 __le32 le_group = cpu_to_le32(block_group);
717d50e4 2019
feb0ab32
DW		 2020 if ((sbi->s_es->s_feature_ro_compat &
2021 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2022 /* Use new metadata_csum algorithm */
d6a77105 2023 __le16 save_csum;
feb0ab32
DW		 2024 __u32 csum32;
2025
d6a77105 2026 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2027 gdp->bg_checksum = 0;
2028 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2029 sizeof(le_group));
2030 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2031 sbi->s_desc_size);
d6a77105 2032 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2033
2034 crc = csum32 & 0xFFFF;
2035 goto out;
717d50e4
AD		 2036 }
2037
feb0ab32
DW		 2038 /* old crc16 code */
2039 offset = offsetof(struct ext4_group_desc, bg_checksum);
2040
2041 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2042 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2043 crc = crc16(crc, (__u8 *)gdp, offset);
2044 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2045 /* for checksum of struct ext4_group_desc do the rest...*/
2046 if ((sbi->s_es->s_feature_incompat &
2047 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2048 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2049 crc = crc16(crc, (__u8 *)gdp + offset,
2050 le16_to_cpu(sbi->s_es->s_desc_size) -
2051 offset);
2052
2053out:
717d50e4
AD		 2054 return cpu_to_le16(crc);
2055}
2056
feb0ab32 2057int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2058 struct ext4_group_desc *gdp)
2059{
feb0ab32
DW		 2060 if (ext4_has_group_desc_csum(sb) &&
2061 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2062 block_group, gdp)))
717d50e4
AD		 2063 return 0;
2064
2065 return 1;
2066}
2067
feb0ab32
DW		 2068void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2069 struct ext4_group_desc *gdp)
2070{
2071 if (!ext4_has_group_desc_csum(sb))
2072 return;
2073 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2074}
2075
ac27a0ec 2076/* Called at mount-time, super-block is locked */
bfff6873
LC		 2077static int ext4_check_descriptors(struct super_block *sb,
2078 ext4_group_t *first_not_zeroed)
ac27a0ec 2079{
617ba13b
MC		 2080 struct ext4_sb_info *sbi = EXT4_SB(sb);
2081 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2082 ext4_fsblk_t last_block;
bd81d8ee
LV		 2083 ext4_fsblk_t block_bitmap;
2084 ext4_fsblk_t inode_bitmap;
2085 ext4_fsblk_t inode_table;
ce421581 2086 int flexbg_flag = 0;
bfff6873 2087 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2088
ce421581
JS		 2089 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2090 flexbg_flag = 1;
2091
af5bc92d 2092 ext4_debug("Checking group descriptors");
ac27a0ec 2093
197cd65a
AM		 2094 for (i = 0; i < sbi->s_groups_count; i++) {
2095 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2096
ce421581 2097 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2098 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2099 else
2100 last_block = first_block +
617ba13b 2101 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2102
bfff6873
LC		 2103 if ((grp == sbi->s_groups_count) &&
2104 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2105 grp = i;
2106
8fadc143 2107 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2108 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2109 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2110 "Block bitmap for group %u not in group "
b31e1552 2111 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2112 return 0;
2113 }
8fadc143 2114 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2115 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2116 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2117 "Inode bitmap for group %u not in group "
b31e1552 2118 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2119 return 0;
2120 }
8fadc143 2121 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2122 if (inode_table < first_block ||
2b2d6d01 2123 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2124 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2125 "Inode table for group %u not in group "
b31e1552 2126 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2127 return 0;
2128 }
955ce5f5 2129 ext4_lock_group(sb, i);
feb0ab32 2130 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2131 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2132 "Checksum for group %u failed (%u!=%u)",
2133 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2134 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2135 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2136 ext4_unlock_group(sb, i);
8a266467 2137 return 0;
7ee1ec4c 2138 }
717d50e4 2139 }
955ce5f5 2140 ext4_unlock_group(sb, i);
ce421581
JS		 2141 if (!flexbg_flag)
2142 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2143 }
bfff6873
LC		 2144 if (NULL != first_not_zeroed)
2145 *first_not_zeroed = grp;
ac27a0ec 2146
5dee5437
TT		 2147 ext4_free_blocks_count_set(sbi->s_es,
2148 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2149 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2150 return 1;
2151}
2152
617ba13b 2153/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2154 * the superblock) which were deleted from all directories, but held open by
2155 * a process at the time of a crash. We walk the list and try to delete these
2156 * inodes at recovery time (only with a read-write filesystem).
2157 *
2158 * In order to keep the orphan inode chain consistent during traversal (in
2159 * case of crash during recovery), we link each inode into the superblock
2160 * orphan list_head and handle it the same way as an inode deletion during
2161 * normal operation (which journals the operations for us).
2162 *
2163 * We only do an iget() and an iput() on each inode, which is very safe if we
2164 * accidentally point at an in-use or already deleted inode. The worst that
2165 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2166 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2167 * e2fsck was run on this filesystem, and it must have already done the orphan
2168 * inode cleanup for us, so we can safely abort without any further action.
2169 */
2b2d6d01
TT		 2170static void ext4_orphan_cleanup(struct super_block *sb,
2171 struct ext4_super_block *es)
ac27a0ec
DK		 2172{
2173 unsigned int s_flags = sb->s_flags;
2174 int nr_orphans = 0, nr_truncates = 0;
2175#ifdef CONFIG_QUOTA
2176 int i;
2177#endif
2178 if (!es->s_last_orphan) {
2179 jbd_debug(4, "no orphan inodes to clean up\n");
2180 return;
2181 }
2182
a8f48a95 2183 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2184 ext4_msg(sb, KERN_ERR, "write access "
2185 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2186 return;
2187 }
2188
d39195c3
AG		 2189 /* Check if feature set would not allow a r/w mount */
2190 if (!ext4_feature_set_ok(sb, 0)) {
2191 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2192 "unknown ROCOMPAT features");
2193 return;
2194 }
2195
617ba13b 2196 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2197 /* don't clear list on RO mount w/ errors */
2198 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
ac27a0ec
DK		 2199 jbd_debug(1, "Errors on filesystem, "
2200 "clearing orphan list.\n");
c25f9bc6
ES		 2201 es->s_last_orphan = 0;
2202 }
ac27a0ec
DK		 2203 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2204 return;
2205 }
2206
2207 if (s_flags & MS_RDONLY) {
b31e1552 2208 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2209 sb->s_flags &= ~MS_RDONLY;
2210 }
2211#ifdef CONFIG_QUOTA
2212 /* Needed for iput() to work correctly and not trash data */
2213 sb->s_flags |= MS_ACTIVE;
2214 /* Turn on quotas so that they are updated correctly */
2215 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2216 if (EXT4_SB(sb)->s_qf_names[i]) {
2217 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2218 if (ret < 0)
b31e1552
ES		 2219 ext4_msg(sb, KERN_ERR,
2220 "Cannot turn on journaled "
2221 "quota: error %d", ret);
ac27a0ec
DK		 2222 }
2223 }
2224#endif
2225
2226 while (es->s_last_orphan) {
2227 struct inode *inode;
2228
97bd42b9
JB		 2229 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2230 if (IS_ERR(inode)) {
ac27a0ec
DK		 2231 es->s_last_orphan = 0;
2232 break;
2233 }
2234
617ba13b 2235 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2236 dquot_initialize(inode);
ac27a0ec 2237 if (inode->i_nlink) {
566370a2
PT		 2238 if (test_opt(sb, DEBUG))
2239 ext4_msg(sb, KERN_DEBUG,
2240 "%s: truncating inode %lu to %lld bytes",
2241 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2242 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2243 inode->i_ino, inode->i_size);
721e3eba 2244 mutex_lock(&inode->i_mutex);
55f252c9 2245 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2246 ext4_truncate(inode);
721e3eba 2247 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2248 nr_truncates++;
2249 } else {
566370a2
PT		 2250 if (test_opt(sb, DEBUG))
2251 ext4_msg(sb, KERN_DEBUG,
2252 "%s: deleting unreferenced inode %lu",
2253 __func__, inode->i_ino);
ac27a0ec
DK		 2254 jbd_debug(2, "deleting unreferenced inode %lu\n",
2255 inode->i_ino);
2256 nr_orphans++;
2257 }
2258 iput(inode); /* The delete magic happens here! */
2259 }
2260
2b2d6d01 2261#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2262
2263 if (nr_orphans)
b31e1552
ES		 2264 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2265 PLURAL(nr_orphans));
ac27a0ec 2266 if (nr_truncates)
b31e1552
ES		 2267 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2268 PLURAL(nr_truncates));
ac27a0ec
DK		 2269#ifdef CONFIG_QUOTA
2270 /* Turn quotas off */
2271 for (i = 0; i < MAXQUOTAS; i++) {
2272 if (sb_dqopt(sb)->files[i])
287a8095 2273 dquot_quota_off(sb, i);
ac27a0ec
DK		 2274 }
2275#endif
2276 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2277}
0b8e58a1 2278
cd2291a4
ES		 2279/*
2280 * Maximal extent format file size.
2281 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2282 * extent format containers, within a sector_t, and within i_blocks
2283 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2284 * so that won't be a limiting factor.
2285 *
f17722f9
LC		 2286 * However there is other limiting factor. We do store extents in the form
2287 * of starting block and length, hence the resulting length of the extent
2288 * covering maximum file size must fit into on-disk format containers as
2289 * well. Given that length is always by 1 unit bigger than max unit (because
2290 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2291 *
cd2291a4
ES		 2292 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2293 */
f287a1a5 2294static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2295{
2296 loff_t res;
2297 loff_t upper_limit = MAX_LFS_FILESIZE;
2298
2299 /* small i_blocks in vfs inode? */
f287a1a5 2300 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2301 /*
90c699a9 2302 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2303 * i_block represent total blocks in 512 bytes
2304 * 32 == size of vfs inode i_blocks * 8
2305 */
2306 upper_limit = (1LL << 32) - 1;
2307
2308 /* total blocks in file system block size */
2309 upper_limit >>= (blkbits - 9);
2310 upper_limit <<= blkbits;
2311 }
2312
f17722f9
LC		 2313 /*
2314 * 32-bit extent-start container, ee_block. We lower the maxbytes
2315 * by one fs block, so ee_len can cover the extent of maximum file
2316 * size
2317 */
2318 res = (1LL << 32) - 1;
cd2291a4 2319 res <<= blkbits;
cd2291a4
ES		 2320
2321 /* Sanity check against vm- & vfs- imposed limits */
2322 if (res > upper_limit)
2323 res = upper_limit;
2324
2325 return res;
2326}
ac27a0ec 2327
ac27a0ec 2328/*
cd2291a4 2329 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2330 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2331 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2332 */
f287a1a5 2333static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2334{
617ba13b 2335 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2336 int meta_blocks;
2337 loff_t upper_limit;
0b8e58a1
AD		 2338 /* This is calculated to be the largest file size for a dense, block
2339 * mapped file such that the file's total number of 512-byte sectors,
2340 * including data and all indirect blocks, does not exceed (2^48 - 1).
2341 *
2342 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2343 * number of 512-byte sectors of the file.
0fc1b451
AK		 2344 */
2345
f287a1a5 2346 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2347 /*
90c699a9 2348 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2349 * the inode i_block field represents total file blocks in
2350 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2351 */
2352 upper_limit = (1LL << 32) - 1;
2353
2354 /* total blocks in file system block size */
2355 upper_limit >>= (bits - 9);
2356
2357 } else {
8180a562
AK		 2358 /*
2359 * We use 48 bit ext4_inode i_blocks
2360 * With EXT4_HUGE_FILE_FL set the i_blocks
2361 * represent total number of blocks in
2362 * file system block size
2363 */
0fc1b451
AK		 2364 upper_limit = (1LL << 48) - 1;
2365
0fc1b451
AK		 2366 }
2367
2368 /* indirect blocks */
2369 meta_blocks = 1;
2370 /* double indirect blocks */
2371 meta_blocks += 1 + (1LL << (bits-2));
2372 /* tripple indirect blocks */
2373 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2374
2375 upper_limit -= meta_blocks;
2376 upper_limit <<= bits;
ac27a0ec
DK		 2377
2378 res += 1LL << (bits-2);
2379 res += 1LL << (2*(bits-2));
2380 res += 1LL << (3*(bits-2));
2381 res <<= bits;
2382 if (res > upper_limit)
2383 res = upper_limit;
0fc1b451
AK		 2384
2385 if (res > MAX_LFS_FILESIZE)
2386 res = MAX_LFS_FILESIZE;
2387
ac27a0ec
DK		 2388 return res;
2389}
2390
617ba13b 2391static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2392 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2393{
617ba13b 2394 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2395 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2396 int has_super = 0;
2397
2398 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2399
617ba13b 2400 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2401 nr < first_meta_bg)
70bbb3e0 2402 return logical_sb_block + nr + 1;
ac27a0ec 2403 bg = sbi->s_desc_per_block * nr;
617ba13b 2404 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2405 has_super = 1;
0b8e58a1 2406
617ba13b 2407 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2408}
2409
c9de560d
AT		 2410/**
2411 * ext4_get_stripe_size: Get the stripe size.
2412 * @sbi: In memory super block info
2413 *
2414 * If we have specified it via mount option, then
2415 * use the mount option value. If the value specified at mount time is
2416 * greater than the blocks per group use the super block value.
2417 * If the super block value is greater than blocks per group return 0.
2418 * Allocator needs it be less than blocks per group.
2419 *
2420 */
2421static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2422{
2423 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2424 unsigned long stripe_width =
2425 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2426 int ret;
c9de560d
AT		 2427
2428 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2429 ret = sbi->s_stripe;
2430 else if (stripe_width <= sbi->s_blocks_per_group)
2431 ret = stripe_width;
2432 else if (stride <= sbi->s_blocks_per_group)
2433 ret = stride;
2434 else
2435 ret = 0;
c9de560d 2436
3eb08658
DE		 2437 /*
2438 * If the stripe width is 1, this makes no sense and
2439 * we set it to 0 to turn off stripe handling code.
2440 */
2441 if (ret <= 1)
2442 ret = 0;
c9de560d 2443
3eb08658 2444 return ret;
c9de560d 2445}
ac27a0ec 2446
3197ebdb
TT		 2447/* sysfs supprt */
2448
2449struct ext4_attr {
2450 struct attribute attr;
2451 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2452 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2453 const char *, size_t);
f2d50a65
JK		 2454 union {
2455 int offset;
2456 int deprecated_val;
2457 } u;
3197ebdb
TT		 2458};
2459
27dd4385
LC		 2460static int parse_strtoull(const char *buf,
2461 unsigned long long max, unsigned long long *value)
2462{
2463 int ret;
2464
2465 ret = kstrtoull(skip_spaces(buf), 0, value);
2466 if (!ret && *value > max)
2467 ret = -EINVAL;
2468 return ret;
2469}
2470
3197ebdb
TT		 2471static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2472 struct ext4_sb_info *sbi,
2473 char *buf)
2474{
2475 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2476 (s64) EXT4_C2B(sbi,
2477 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2478}
2479
2480static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2481 struct ext4_sb_info *sbi, char *buf)
2482{
2483 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2484
f613dfcb
TT		 2485 if (!sb->s_bdev->bd_part)
2486 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2487 return snprintf(buf, PAGE_SIZE, "%lu\n",
2488 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2489 sbi->s_sectors_written_start) >> 1);
2490}
2491
2492static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2493 struct ext4_sb_info *sbi, char *buf)
2494{
2495 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2496
f613dfcb
TT		 2497 if (!sb->s_bdev->bd_part)
2498 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2499 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2500 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2501 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2502 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2503}
2504
2505static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2506 struct ext4_sb_info *sbi,
2507 const char *buf, size_t count)
2508{
2509 unsigned long t;
e1091b15 2510 int ret;
3197ebdb 2511
e1091b15
LC		 2512 ret = kstrtoul(skip_spaces(buf), 0, &t);
2513 if (ret)
2514 return ret;
3197ebdb 2515
e1091b15 2516 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2517 return -EINVAL;
2518
2519 sbi->s_inode_readahead_blks = t;
2520 return count;
2521}
2522
2523static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2524 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2525{
f2d50a65 2526 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2527
2528 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2529}
2530
2531static ssize_t sbi_ui_store(struct ext4_attr *a,
2532 struct ext4_sb_info *sbi,
2533 const char *buf, size_t count)
2534{
f2d50a65 2535 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2536 unsigned long t;
e1091b15 2537 int ret;
3197ebdb 2538
e1091b15
LC		 2539 ret = kstrtoul(skip_spaces(buf), 0, &t);
2540 if (ret)
2541 return ret;
3197ebdb
TT		 2542 *ui = t;
2543 return count;
2544}
2545
27dd4385
LC		 2546static ssize_t reserved_clusters_show(struct ext4_attr *a,
2547 struct ext4_sb_info *sbi, char *buf)
2548{
2549 return snprintf(buf, PAGE_SIZE, "%llu\n",
2550 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2551}
2552
2553static ssize_t reserved_clusters_store(struct ext4_attr *a,
2554 struct ext4_sb_info *sbi,
2555 const char *buf, size_t count)
2556{
2557 unsigned long long val;
2558 int ret;
2559
2560 if (parse_strtoull(buf, -1ULL, &val))
2561 return -EINVAL;
2562 ret = ext4_reserve_clusters(sbi, val);
2563
2564 return ret ? ret : count;
2565}
2566
2c0544b2
TT		 2567static ssize_t trigger_test_error(struct ext4_attr *a,
2568 struct ext4_sb_info *sbi,
2569 const char *buf, size_t count)
2570{
2571 int len = count;
2572
2573 if (!capable(CAP_SYS_ADMIN))
2574 return -EPERM;
2575
2576 if (len && buf[len-1] == '\n')
2577 len--;
2578
2579 if (len)
2580 ext4_error(sbi->s_sb, "%.*s", len, buf);
2581 return count;
2582}
2583
f2d50a65
JK		 2584static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2585 struct ext4_sb_info *sbi, char *buf)
2586{
2587 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2588}
2589
3197ebdb
TT		 2590#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2591static struct ext4_attr ext4_attr_##_name = { \
2592 .attr = {.name = __stringify(_name), .mode = _mode }, \
2593 .show = _show, \
2594 .store = _store, \
f2d50a65
JK		 2595 .u = { \
2596 .offset = offsetof(struct ext4_sb_info, _elname),\
2597 }, \
3197ebdb
TT		 2598}
2599#define EXT4_ATTR(name, mode, show, store) \
2600static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2601
857ac889 2602#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2603#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2604#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2605#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2606 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2607#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2608#define EXT4_DEPRECATED_ATTR(_name, _val) \
2609static struct ext4_attr ext4_attr_##_name = { \
2610 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2611 .show = sbi_deprecated_show, \
2612 .u = { \
2613 .deprecated_val = _val, \
2614 }, \
2615}
3197ebdb
TT		 2616
2617EXT4_RO_ATTR(delayed_allocation_blocks);
2618EXT4_RO_ATTR(session_write_kbytes);
2619EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2620EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2621EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2622 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2623EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2624EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2625EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2626EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2627EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2628EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2629EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2630EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2631EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2632EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2633EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2634EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2635EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2636EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2637EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2638EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
3197ebdb
TT		 2639
2640static struct attribute *ext4_attrs[] = {
2641 ATTR_LIST(delayed_allocation_blocks),
2642 ATTR_LIST(session_write_kbytes),
2643 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2644 ATTR_LIST(reserved_clusters),
3197ebdb 2645 ATTR_LIST(inode_readahead_blks),
11013911 2646 ATTR_LIST(inode_goal),
3197ebdb
TT		 2647 ATTR_LIST(mb_stats),
2648 ATTR_LIST(mb_max_to_scan),
2649 ATTR_LIST(mb_min_to_scan),
2650 ATTR_LIST(mb_order2_req),
2651 ATTR_LIST(mb_stream_req),
2652 ATTR_LIST(mb_group_prealloc),
55138e0b 2653 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2654 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2655 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2656 ATTR_LIST(err_ratelimit_interval_ms),
2657 ATTR_LIST(err_ratelimit_burst),
2658 ATTR_LIST(warning_ratelimit_interval_ms),
2659 ATTR_LIST(warning_ratelimit_burst),
2660 ATTR_LIST(msg_ratelimit_interval_ms),
2661 ATTR_LIST(msg_ratelimit_burst),
3197ebdb
TT		 2662 NULL,
2663};
2664
857ac889
LC		 2665/* Features this copy of ext4 supports */
2666EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2667EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2668EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2669
2670static struct attribute *ext4_feat_attrs[] = {
2671 ATTR_LIST(lazy_itable_init),
27ee40df 2672 ATTR_LIST(batched_discard),
5e7bbef1 2673 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2674 NULL,
2675};
2676
3197ebdb
TT		 2677static ssize_t ext4_attr_show(struct kobject *kobj,
2678 struct attribute *attr, char *buf)
2679{
2680 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2681 s_kobj);
2682 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2683
2684 return a->show ? a->show(a, sbi, buf) : 0;
2685}
2686
2687static ssize_t ext4_attr_store(struct kobject *kobj,
2688 struct attribute *attr,
2689 const char *buf, size_t len)
2690{
2691 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2692 s_kobj);
2693 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2694
2695 return a->store ? a->store(a, sbi, buf, len) : 0;
2696}
2697
2698static void ext4_sb_release(struct kobject *kobj)
2699{
2700 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2701 s_kobj);
2702 complete(&sbi->s_kobj_unregister);
2703}
2704
52cf25d0 2705static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2706 .show = ext4_attr_show,
2707 .store = ext4_attr_store,
2708};
2709
2710static struct kobj_type ext4_ktype = {
2711 .default_attrs = ext4_attrs,
2712 .sysfs_ops = &ext4_attr_ops,
2713 .release = ext4_sb_release,
2714};
2715
857ac889
LC		 2716static void ext4_feat_release(struct kobject *kobj)
2717{
2718 complete(&ext4_feat->f_kobj_unregister);
2719}
2720
2721static struct kobj_type ext4_feat_ktype = {
2722 .default_attrs = ext4_feat_attrs,
2723 .sysfs_ops = &ext4_attr_ops,
2724 .release = ext4_feat_release,
2725};
2726
a13fb1a4
ES		 2727/*
2728 * Check whether this filesystem can be mounted based on
2729 * the features present and the RDONLY/RDWR mount requested.
2730 * Returns 1 if this filesystem can be mounted as requested,
2731 * 0 if it cannot be.
2732 */
2733static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2734{
2735 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2736 ext4_msg(sb, KERN_ERR,
2737 "Couldn't mount because of "
2738 "unsupported optional features (%x)",
2739 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2740 ~EXT4_FEATURE_INCOMPAT_SUPP));
2741 return 0;
2742 }
2743
2744 if (readonly)
2745 return 1;
2746
2747 /* Check that feature set is OK for a read-write mount */
2748 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2749 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2750 "unsupported optional features (%x)",
2751 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2752 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2753 return 0;
2754 }
2755 /*
2756 * Large file size enabled file system can only be mounted
2757 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2758 */
2759 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2760 if (sizeof(blkcnt_t) < sizeof(u64)) {
2761 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2762 "cannot be mounted RDWR without "
2763 "CONFIG_LBDAF");
2764 return 0;
2765 }
2766 }
bab08ab9
TT		 2767 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2768 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2769 ext4_msg(sb, KERN_ERR,
2770 "Can't support bigalloc feature without "
2771 "extents feature\n");
2772 return 0;
2773 }
7c319d32
AK		 2774
2775#ifndef CONFIG_QUOTA
2776 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2777 !readonly) {
2778 ext4_msg(sb, KERN_ERR,
2779 "Filesystem with quota feature cannot be mounted RDWR "
2780 "without CONFIG_QUOTA");
2781 return 0;
2782 }
2783#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2784 return 1;
2785}
2786
66e61a9e
TT		 2787/*
2788 * This function is called once a day if we have errors logged
2789 * on the file system
2790 */
2791static void print_daily_error_info(unsigned long arg)
2792{
2793 struct super_block *sb = (struct super_block *) arg;
2794 struct ext4_sb_info *sbi;
2795 struct ext4_super_block *es;
2796
2797 sbi = EXT4_SB(sb);
2798 es = sbi->s_es;
2799
2800 if (es->s_error_count)
2801 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2802 le32_to_cpu(es->s_error_count));
2803 if (es->s_first_error_time) {
2804 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2805 sb->s_id, le32_to_cpu(es->s_first_error_time),
2806 (int) sizeof(es->s_first_error_func),
2807 es->s_first_error_func,
2808 le32_to_cpu(es->s_first_error_line));
2809 if (es->s_first_error_ino)
2810 printk(": inode %u",
2811 le32_to_cpu(es->s_first_error_ino));
2812 if (es->s_first_error_block)
2813 printk(": block %llu", (unsigned long long)
2814 le64_to_cpu(es->s_first_error_block));
2815 printk("\n");
2816 }
2817 if (es->s_last_error_time) {
2818 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2819 sb->s_id, le32_to_cpu(es->s_last_error_time),
2820 (int) sizeof(es->s_last_error_func),
2821 es->s_last_error_func,
2822 le32_to_cpu(es->s_last_error_line));
2823 if (es->s_last_error_ino)
2824 printk(": inode %u",
2825 le32_to_cpu(es->s_last_error_ino));
2826 if (es->s_last_error_block)
2827 printk(": block %llu", (unsigned long long)
2828 le64_to_cpu(es->s_last_error_block));
2829 printk("\n");
2830 }
2831 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2832}
2833
bfff6873
LC		 2834/* Find next suitable group and run ext4_init_inode_table */
2835static int ext4_run_li_request(struct ext4_li_request *elr)
2836{
2837 struct ext4_group_desc *gdp = NULL;
2838 ext4_group_t group, ngroups;
2839 struct super_block *sb;
2840 unsigned long timeout = 0;
2841 int ret = 0;
2842
2843 sb = elr->lr_super;
2844 ngroups = EXT4_SB(sb)->s_groups_count;
2845
8e8ad8a5 2846 sb_start_write(sb);
bfff6873
LC		 2847 for (group = elr->lr_next_group; group < ngroups; group++) {
2848 gdp = ext4_get_group_desc(sb, group, NULL);
2849 if (!gdp) {
2850 ret = 1;
2851 break;
2852 }
2853
2854 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2855 break;
2856 }
2857
7f511862 2858 if (group >= ngroups)
bfff6873
LC		 2859 ret = 1;
2860
2861 if (!ret) {
2862 timeout = jiffies;
2863 ret = ext4_init_inode_table(sb, group,
2864 elr->lr_timeout ? 0 : 1);
2865 if (elr->lr_timeout == 0) {
51ce6511
LC		 2866 timeout = (jiffies - timeout) *
2867 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2868 elr->lr_timeout = timeout;
2869 }
2870 elr->lr_next_sched = jiffies + elr->lr_timeout;
2871 elr->lr_next_group = group + 1;
2872 }
8e8ad8a5 2873 sb_end_write(sb);
bfff6873
LC		 2874
2875 return ret;
2876}
2877
2878/*
2879 * Remove lr_request from the list_request and free the
4ed5c033 2880 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2881 */
2882static void ext4_remove_li_request(struct ext4_li_request *elr)
2883{
2884 struct ext4_sb_info *sbi;
2885
2886 if (!elr)
2887 return;
2888
2889 sbi = elr->lr_sbi;
2890
2891 list_del(&elr->lr_request);
2892 sbi->s_li_request = NULL;
2893 kfree(elr);
2894}
2895
2896static void ext4_unregister_li_request(struct super_block *sb)
2897{
1bb933fb
LC		 2898 mutex_lock(&ext4_li_mtx);
2899 if (!ext4_li_info) {
2900 mutex_unlock(&ext4_li_mtx);
bfff6873 2901 return;
1bb933fb 2902 }
bfff6873
LC		 2903
2904 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2905 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2906 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2907 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2908}
2909
8f1f7453
ES		 2910static struct task_struct *ext4_lazyinit_task;
2911
bfff6873
LC		 2912/*
2913 * This is the function where ext4lazyinit thread lives. It walks
2914 * through the request list searching for next scheduled filesystem.
2915 * When such a fs is found, run the lazy initialization request
2916 * (ext4_rn_li_request) and keep track of the time spend in this
2917 * function. Based on that time we compute next schedule time of
2918 * the request. When walking through the list is complete, compute
2919 * next waking time and put itself into sleep.
2920 */
2921static int ext4_lazyinit_thread(void *arg)
2922{
2923 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2924 struct list_head *pos, *n;
2925 struct ext4_li_request *elr;
4ed5c033 2926 unsigned long next_wakeup, cur;
bfff6873
LC		 2927
2928 BUG_ON(NULL == eli);
2929
bfff6873
LC		 2930cont_thread:
2931 while (true) {
2932 next_wakeup = MAX_JIFFY_OFFSET;
2933
2934 mutex_lock(&eli->li_list_mtx);
2935 if (list_empty(&eli->li_request_list)) {
2936 mutex_unlock(&eli->li_list_mtx);
2937 goto exit_thread;
2938 }
2939
2940 list_for_each_safe(pos, n, &eli->li_request_list) {
2941 elr = list_entry(pos, struct ext4_li_request,
2942 lr_request);
2943
b2c78cd0
TT		 2944 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2945 if (ext4_run_li_request(elr) != 0) {
2946 /* error, remove the lazy_init job */
2947 ext4_remove_li_request(elr);
2948 continue;
2949 }
bfff6873
LC		 2950 }
2951
2952 if (time_before(elr->lr_next_sched, next_wakeup))
2953 next_wakeup = elr->lr_next_sched;
2954 }
2955 mutex_unlock(&eli->li_list_mtx);
2956
a0acae0e 2957 try_to_freeze();
bfff6873 2958
4ed5c033
LC		 2959 cur = jiffies;
2960 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2961 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2962 cond_resched();
2963 continue;
2964 }
2965
4ed5c033
LC		 2966 schedule_timeout_interruptible(next_wakeup - cur);
2967
8f1f7453
ES		 2968 if (kthread_should_stop()) {
2969 ext4_clear_request_list();
2970 goto exit_thread;
2971 }
bfff6873
LC		 2972 }
2973
2974exit_thread:
2975 /*
2976 * It looks like the request list is empty, but we need
2977 * to check it under the li_list_mtx lock, to prevent any
2978 * additions into it, and of course we should lock ext4_li_mtx
2979 * to atomically free the list and ext4_li_info, because at
2980 * this point another ext4 filesystem could be registering
2981 * new one.
2982 */
2983 mutex_lock(&ext4_li_mtx);
2984 mutex_lock(&eli->li_list_mtx);
2985 if (!list_empty(&eli->li_request_list)) {
2986 mutex_unlock(&eli->li_list_mtx);
2987 mutex_unlock(&ext4_li_mtx);
2988 goto cont_thread;
2989 }
2990 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2991 kfree(ext4_li_info);
2992 ext4_li_info = NULL;
2993 mutex_unlock(&ext4_li_mtx);
2994
2995 return 0;
2996}
2997
2998static void ext4_clear_request_list(void)
2999{
3000 struct list_head *pos, *n;
3001 struct ext4_li_request *elr;
3002
3003 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3004 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3005 elr = list_entry(pos, struct ext4_li_request,
3006 lr_request);
3007 ext4_remove_li_request(elr);
3008 }
3009 mutex_unlock(&ext4_li_info->li_list_mtx);
3010}
3011
3012static int ext4_run_lazyinit_thread(void)
3013{
8f1f7453
ES		 3014 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3015 ext4_li_info, "ext4lazyinit");
3016 if (IS_ERR(ext4_lazyinit_task)) {
3017 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3018 ext4_clear_request_list();
bfff6873
LC		 3019 kfree(ext4_li_info);
3020 ext4_li_info = NULL;
92b97816 3021 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3022 "initialization thread\n",
3023 err);
3024 return err;
3025 }
3026 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3027 return 0;
3028}
3029
3030/*
3031 * Check whether it make sense to run itable init. thread or not.
3032 * If there is at least one uninitialized inode table, return
3033 * corresponding group number, else the loop goes through all
3034 * groups and return total number of groups.
3035 */
3036static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3037{
3038 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3039 struct ext4_group_desc *gdp = NULL;
3040
3041 for (group = 0; group < ngroups; group++) {
3042 gdp = ext4_get_group_desc(sb, group, NULL);
3043 if (!gdp)
3044 continue;
3045
3046 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3047 break;
3048 }
3049
3050 return group;
3051}
3052
3053static int ext4_li_info_new(void)
3054{
3055 struct ext4_lazy_init *eli = NULL;
3056
3057 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3058 if (!eli)
3059 return -ENOMEM;
3060
bfff6873
LC		 3061 INIT_LIST_HEAD(&eli->li_request_list);
3062 mutex_init(&eli->li_list_mtx);
3063
bfff6873
LC		 3064 eli->li_state |= EXT4_LAZYINIT_QUIT;
3065
3066 ext4_li_info = eli;
3067
3068 return 0;
3069}
3070
3071static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3072 ext4_group_t start)
3073{
3074 struct ext4_sb_info *sbi = EXT4_SB(sb);
3075 struct ext4_li_request *elr;
bfff6873
LC		 3076
3077 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3078 if (!elr)
3079 return NULL;
3080
3081 elr->lr_super = sb;
3082 elr->lr_sbi = sbi;
3083 elr->lr_next_group = start;
3084
3085 /*
3086 * Randomize first schedule time of the request to
3087 * spread the inode table initialization requests
3088 * better.
3089 */
dd1f723b
TT		 3090 elr->lr_next_sched = jiffies + (prandom_u32() %
3091 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3092 return elr;
3093}
3094
7f511862
TT		 3095int ext4_register_li_request(struct super_block *sb,
3096 ext4_group_t first_not_zeroed)
bfff6873
LC		 3097{
3098 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3099 struct ext4_li_request *elr = NULL;
bfff6873 3100 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3101 int ret = 0;
bfff6873 3102
7f511862 3103 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3104 if (sbi->s_li_request != NULL) {
3105 /*
3106 * Reset timeout so it can be computed again, because
3107 * s_li_wait_mult might have changed.
3108 */
3109 sbi->s_li_request->lr_timeout = 0;
7f511862 3110 goto out;
51ce6511 3111 }
bfff6873
LC		 3112
3113 if (first_not_zeroed == ngroups ||
3114 (sb->s_flags & MS_RDONLY) ||
55ff3840 3115 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3116 goto out;
bfff6873
LC		 3117
3118 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3119 if (!elr) {
3120 ret = -ENOMEM;
3121 goto out;
3122 }
bfff6873
LC		 3123
3124 if (NULL == ext4_li_info) {
3125 ret = ext4_li_info_new();
3126 if (ret)
3127 goto out;
3128 }
3129
3130 mutex_lock(&ext4_li_info->li_list_mtx);
3131 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3132 mutex_unlock(&ext4_li_info->li_list_mtx);
3133
3134 sbi->s_li_request = elr;
46e4690b
TM		 3135 /*
3136 * set elr to NULL here since it has been inserted to
3137 * the request_list and the removal and free of it is
3138 * handled by ext4_clear_request_list from now on.
3139 */
3140 elr = NULL;
bfff6873
LC		 3141
3142 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3143 ret = ext4_run_lazyinit_thread();
3144 if (ret)
3145 goto out;
3146 }
bfff6873 3147out:
beed5ecb
NK		 3148 mutex_unlock(&ext4_li_mtx);
3149 if (ret)
bfff6873 3150 kfree(elr);
bfff6873
LC		 3151 return ret;
3152}
3153
3154/*
3155 * We do not need to lock anything since this is called on
3156 * module unload.
3157 */
3158static void ext4_destroy_lazyinit_thread(void)
3159{
3160 /*
3161 * If thread exited earlier
3162 * there's nothing to be done.
3163 */
8f1f7453 3164 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3165 return;
3166
8f1f7453 3167 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3168}
3169
25ed6e8a
DW		 3170static int set_journal_csum_feature_set(struct super_block *sb)
3171{
3172 int ret = 1;
3173 int compat, incompat;
3174 struct ext4_sb_info *sbi = EXT4_SB(sb);
3175
3176 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3177 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3178 /* journal checksum v2 */
3179 compat = 0;
3180 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3181 } else {
3182 /* journal checksum v1 */
3183 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3184 incompat = 0;
3185 }
3186
3187 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3188 ret = jbd2_journal_set_features(sbi->s_journal,
3189 compat, 0,
3190 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3191 incompat);
3192 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3193 ret = jbd2_journal_set_features(sbi->s_journal,
3194 compat, 0,
3195 incompat);
3196 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3197 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3198 } else {
3199 jbd2_journal_clear_features(sbi->s_journal,
3200 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3201 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3202 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3203 }
3204
3205 return ret;
3206}
3207
952fc18e
TT		 3208/*
3209 * Note: calculating the overhead so we can be compatible with
3210 * historical BSD practice is quite difficult in the face of
3211 * clusters/bigalloc. This is because multiple metadata blocks from
3212 * different block group can end up in the same allocation cluster.
3213 * Calculating the exact overhead in the face of clustered allocation
3214 * requires either O(all block bitmaps) in memory or O(number of block
3215 * groups**2) in time. We will still calculate the superblock for
3216 * older file systems --- and if we come across with a bigalloc file
3217 * system with zero in s_overhead_clusters the estimate will be close to
3218 * correct especially for very large cluster sizes --- but for newer
3219 * file systems, it's better to calculate this figure once at mkfs
3220 * time, and store it in the superblock. If the superblock value is
3221 * present (even for non-bigalloc file systems), we will use it.
3222 */
3223static int count_overhead(struct super_block *sb, ext4_group_t grp,
3224 char *buf)
3225{
3226 struct ext4_sb_info *sbi = EXT4_SB(sb);
3227 struct ext4_group_desc *gdp;
3228 ext4_fsblk_t first_block, last_block, b;
3229 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3230 int s, j, count = 0;
3231
0548bbb8
TT		 3232 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3233 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3234 sbi->s_itb_per_group + 2);
3235
952fc18e
TT		 3236 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3237 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3238 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3239 for (i = 0; i < ngroups; i++) {
3240 gdp = ext4_get_group_desc(sb, i, NULL);
3241 b = ext4_block_bitmap(sb, gdp);
3242 if (b >= first_block && b <= last_block) {
3243 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3244 count++;
3245 }
3246 b = ext4_inode_bitmap(sb, gdp);
3247 if (b >= first_block && b <= last_block) {
3248 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3249 count++;
3250 }
3251 b = ext4_inode_table(sb, gdp);
3252 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3253 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3254 int c = EXT4_B2C(sbi, b - first_block);
3255 ext4_set_bit(c, buf);
3256 count++;
3257 }
3258 if (i != grp)
3259 continue;
3260 s = 0;
3261 if (ext4_bg_has_super(sb, grp)) {
3262 ext4_set_bit(s++, buf);
3263 count++;
3264 }
3265 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3266 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3267 count++;
3268 }
3269 }
3270 if (!count)
3271 return 0;
3272 return EXT4_CLUSTERS_PER_GROUP(sb) -
3273 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3274}
3275
3276/*
3277 * Compute the overhead and stash it in sbi->s_overhead
3278 */
3279int ext4_calculate_overhead(struct super_block *sb)
3280{
3281 struct ext4_sb_info *sbi = EXT4_SB(sb);
3282 struct ext4_super_block *es = sbi->s_es;
3283 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3284 ext4_fsblk_t overhead = 0;
3285 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3286
952fc18e
TT		 3287 if (!buf)
3288 return -ENOMEM;
3289
3290 /*
3291 * Compute the overhead (FS structures). This is constant
3292 * for a given filesystem unless the number of block groups
3293 * changes so we cache the previous value until it does.
3294 */
3295
3296 /*
3297 * All of the blocks before first_data_block are overhead
3298 */
3299 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3300
3301 /*
3302 * Add the overhead found in each block group
3303 */
3304 for (i = 0; i < ngroups; i++) {
3305 int blks;
3306
3307 blks = count_overhead(sb, i, buf);
3308 overhead += blks;
3309 if (blks)
3310 memset(buf, 0, PAGE_SIZE);
3311 cond_resched();
3312 }
0875a2b4
ES		 3313 /* Add the journal blocks as well */
3314 if (sbi->s_journal)
810da240 3315 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3316
952fc18e
TT		 3317 sbi->s_overhead = overhead;
3318 smp_wmb();
3319 free_page((unsigned long) buf);
3320 return 0;
3321}
3322
27dd4385 3323
30fac0f7 3324static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3325{
3326 ext4_fsblk_t resv_clusters;
3327
30fac0f7
JK		 3328 /*
3329 * There's no need to reserve anything when we aren't using extents.
3330 * The space estimates are exact, there are no unwritten extents,
3331 * hole punching doesn't need new metadata... This is needed especially
3332 * to keep ext2/3 backward compatibility.
3333 */
3334 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3335 return 0;
27dd4385
LC		 3336 /*
3337 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3338 * This should cover the situations where we can not afford to run
3339 * out of space like for example punch hole, or converting
3340 * uninitialized extents in delalloc path. In most cases such
3341 * allocation would require 1, or 2 blocks, higher numbers are
3342 * very rare.
3343 */
30fac0f7
JK		 3344 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3345 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3346
3347 do_div(resv_clusters, 50);
3348 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3349
3350 return resv_clusters;
3351}
3352
3353
3354static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3355{
3356 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3357 sbi->s_cluster_bits;
3358
3359 if (count >= clusters)
3360 return -EINVAL;
3361
3362 atomic64_set(&sbi->s_resv_clusters, count);
3363 return 0;
3364}
3365
2b2d6d01 3366static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3367{
d4c402d9 3368 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3369 struct buffer_head *bh;
617ba13b
MC		 3370 struct ext4_super_block *es = NULL;
3371 struct ext4_sb_info *sbi;
3372 ext4_fsblk_t block;
3373 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3374 ext4_fsblk_t logical_sb_block;
ac27a0ec 3375 unsigned long offset = 0;
ac27a0ec
DK		 3376 unsigned long journal_devnum = 0;
3377 unsigned long def_mount_opts;
3378 struct inode *root;
9f6200bb 3379 char *cp;
0390131b 3380 const char *descr;
dcc7dae3 3381 int ret = -ENOMEM;
281b5995 3382 int blocksize, clustersize;
4ec11028
TT		 3383 unsigned int db_count;
3384 unsigned int i;
281b5995 3385 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3386 __u64 blocks_count;
07aa2ea1 3387 int err = 0;
b3881f74 3388 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3389 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3390
3391 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3392 if (!sbi)
dcc7dae3 3393 goto out_free_orig;
705895b6
PE		 3394
3395 sbi->s_blockgroup_lock =
3396 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3397 if (!sbi->s_blockgroup_lock) {
3398 kfree(sbi);
dcc7dae3 3399 goto out_free_orig;
705895b6 3400 }
ac27a0ec 3401 sb->s_fs_info = sbi;
2c0544b2 3402 sbi->s_sb = sb;
240799cd 3403 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3404 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3405 if (sb->s_bdev->bd_part)
3406 sbi->s_sectors_written_start =
3407 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3408
9f6200bb
TT		 3409 /* Cleanup superblock name */
3410 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3411 *cp = '!';
3412
07aa2ea1 3413 /* -EINVAL is default */
dcc7dae3 3414 ret = -EINVAL;
617ba13b 3415 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3416 if (!blocksize) {
b31e1552 3417 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3418 goto out_fail;
3419 }
3420
3421 /*
617ba13b 3422 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3423 * block sizes. We need to calculate the offset from buffer start.
3424 */
617ba13b 3425 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3426 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3427 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3428 } else {
70bbb3e0 3429 logical_sb_block = sb_block;
ac27a0ec
DK		 3430 }
3431
70bbb3e0 3432 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3433 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3434 goto out_fail;
3435 }
3436 /*
3437 * Note: s_es must be initialized as soon as possible because
617ba13b 3438 * some ext4 macro-instructions depend on its value
ac27a0ec 3439 */
2716b802 3440 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3441 sbi->s_es = es;
3442 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3443 if (sb->s_magic != EXT4_SUPER_MAGIC)
3444 goto cantfind_ext4;
afc32f7e 3445 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3446
feb0ab32
DW		 3447 /* Warn if metadata_csum and gdt_csum are both set. */
3448 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3449 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3450 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3451 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3452 "redundant flags; please run fsck.");
3453
d25425f8
DW		 3454 /* Check for a known checksum algorithm */
3455 if (!ext4_verify_csum_type(sb, es)) {
3456 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3457 "unknown checksum algorithm.");
3458 silent = 1;
3459 goto cantfind_ext4;
3460 }
3461
0441984a
DW		 3462 /* Load the checksum driver */
3463 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3464 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3465 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3466 if (IS_ERR(sbi->s_chksum_driver)) {
3467 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3468 ret = PTR_ERR(sbi->s_chksum_driver);
3469 sbi->s_chksum_driver = NULL;
3470 goto failed_mount;
3471 }
3472 }
3473
a9c47317
DW		 3474 /* Check superblock checksum */
3475 if (!ext4_superblock_csum_verify(sb, es)) {
3476 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3477 "invalid superblock checksum. Run e2fsck?");
3478 silent = 1;
3479 goto cantfind_ext4;
3480 }
3481
3482 /* Precompute checksum seed for all metadata */
3483 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3484 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3485 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3486 sizeof(es->s_uuid));
3487
ac27a0ec
DK		 3488 /* Set defaults before we parse the mount options */
3489 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3490 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3491 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3492 set_opt(sb, DEBUG);
87f26807 3493 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3494 set_opt(sb, GRPID);
617ba13b 3495 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3496 set_opt(sb, NO_UID32);
ea663336 3497 /* xattr user namespace & acls are now defaulted on */
ea663336 3498 set_opt(sb, XATTR_USER);
03010a33 3499#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3500 set_opt(sb, POSIX_ACL);
2e7842b8 3501#endif
617ba13b 3502 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3503 set_opt(sb, JOURNAL_DATA);
617ba13b 3504 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3505 set_opt(sb, ORDERED_DATA);
617ba13b 3506 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3507 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3508
3509 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3510 set_opt(sb, ERRORS_PANIC);
bb4f397a 3511 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3512 set_opt(sb, ERRORS_CONT);
bb4f397a 3513 else
fd8c37ec 3514 set_opt(sb, ERRORS_RO);
8b67f04a 3515 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3516 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3517 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3518 set_opt(sb, DISCARD);
ac27a0ec 3519
08cefc7a
EB		 3520 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3521 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3522 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3523 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3524 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3525
8b67f04a 3526 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3527 set_opt(sb, BARRIER);
ac27a0ec 3528
dd919b98
AK		 3529 /*
3530 * enable delayed allocation by default
3531 * Use -o nodelalloc to turn it off
3532 */
bc0b75f7 3533 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3534 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3535 set_opt(sb, DELALLOC);
dd919b98 3536
51ce6511
LC		 3537 /*
3538 * set default s_li_wait_mult for lazyinit, for the case there is
3539 * no mount option specified.
3540 */
3541 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3542
8b67f04a 3543 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3544 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3545 ext4_msg(sb, KERN_WARNING,
3546 "failed to parse options in superblock: %s",
3547 sbi->s_es->s_mount_opts);
3548 }
5a916be1 3549 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3550 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3551 &journal_ioprio, 0))
ac27a0ec
DK		 3552 goto failed_mount;
3553
56889787
TT		 3554 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3555 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3556 "with data=journal disables delayed "
3557 "allocation and O_DIRECT support!\n");
3558 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3559 ext4_msg(sb, KERN_ERR, "can't mount with "
3560 "both data=journal and delalloc");
3561 goto failed_mount;
3562 }
3563 if (test_opt(sb, DIOREAD_NOLOCK)) {
3564 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3565 "both data=journal and dioread_nolock");
56889787
TT		 3566 goto failed_mount;
3567 }
3568 if (test_opt(sb, DELALLOC))
3569 clear_opt(sb, DELALLOC);
3570 }
3571
ac27a0ec 3572 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3573 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3574
617ba13b
MC		 3575 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3576 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3577 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3578 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3579 ext4_msg(sb, KERN_WARNING,
3580 "feature flags set on rev 0 fs, "
3581 "running e2fsck is recommended");
469108ff 3582
ed3654eb
TT		 3583 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3584 set_opt2(sb, HURD_COMPAT);
3585 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3586 EXT4_FEATURE_INCOMPAT_64BIT)) {
3587 ext4_msg(sb, KERN_ERR,
3588 "The Hurd can't support 64-bit file systems");
3589 goto failed_mount;
3590 }
3591 }
3592
2035e776
TT		 3593 if (IS_EXT2_SB(sb)) {
3594 if (ext2_feature_set_ok(sb))
3595 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3596 "using the ext4 subsystem");
3597 else {
3598 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3599 "to feature incompatibilities");
3600 goto failed_mount;
3601 }
3602 }
3603
3604 if (IS_EXT3_SB(sb)) {
3605 if (ext3_feature_set_ok(sb))
3606 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3607 "using the ext4 subsystem");
3608 else {
3609 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3610 "to feature incompatibilities");
3611 goto failed_mount;
3612 }
3613 }
3614
ac27a0ec
DK		 3615 /*
3616 * Check feature flags regardless of the revision level, since we
3617 * previously didn't change the revision level when setting the flags,
3618 * so there is a chance incompat flags are set on a rev 0 filesystem.
3619 */
a13fb1a4 3620 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3621 goto failed_mount;
a13fb1a4 3622
261cb20c 3623 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3624 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3625 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3626 ext4_msg(sb, KERN_ERR,
3627 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3628 goto failed_mount;
3629 }
3630
ac27a0ec 3631 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3632 /* Validate the filesystem blocksize */
3633 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3634 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3635 blocksize);
ac27a0ec
DK		 3636 goto failed_mount;
3637 }
3638
2b2d6d01 3639 brelse(bh);
70bbb3e0
AM		 3640 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3641 offset = do_div(logical_sb_block, blocksize);
3642 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3643 if (!bh) {
b31e1552
ES		 3644 ext4_msg(sb, KERN_ERR,
3645 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3646 goto failed_mount;
3647 }
2716b802 3648 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3649 sbi->s_es = es;
617ba13b 3650 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3651 ext4_msg(sb, KERN_ERR,
3652 "Magic mismatch, very weird!");
ac27a0ec
DK		 3653 goto failed_mount;
3654 }
3655 }
3656
a13fb1a4
ES		 3657 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3658 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3659 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3660 has_huge_files);
3661 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3662
617ba13b
MC		 3663 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3664 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3665 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3666 } else {
3667 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3668 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3669 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3670 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3671 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3672 ext4_msg(sb, KERN_ERR,
3673 "unsupported inode size: %d",
2b2d6d01 3674 sbi->s_inode_size);
ac27a0ec
DK		 3675 goto failed_mount;
3676 }
ef7f3835
KS		 3677 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3678 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3679 }
0b8e58a1 3680
0d1ee42f
AR		 3681 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3682 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3683 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3684 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3685 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3686 ext4_msg(sb, KERN_ERR,
3687 "unsupported descriptor size %lu",
0d1ee42f
AR		 3688 sbi->s_desc_size);
3689 goto failed_mount;
3690 }
3691 } else
3692 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3693
ac27a0ec 3694 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3695 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3696 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3697 goto cantfind_ext4;
0b8e58a1 3698
617ba13b 3699 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3700 if (sbi->s_inodes_per_block == 0)
617ba13b 3701 goto cantfind_ext4;
ac27a0ec
DK		 3702 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3703 sbi->s_inodes_per_block;
0d1ee42f 3704 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3705 sbi->s_sbh = bh;
3706 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3707 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3708 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3709
2b2d6d01 3710 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3711 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3712 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3713 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3714 i = le32_to_cpu(es->s_flags);
3715 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3716 sbi->s_hash_unsigned = 3;
3717 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3718#ifdef __CHAR_UNSIGNED__
23301410
TT		 3719 if (!(sb->s_flags & MS_RDONLY))
3720 es->s_flags |=
3721 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3722 sbi->s_hash_unsigned = 3;
f99b2589 3723#else
23301410
TT		 3724 if (!(sb->s_flags & MS_RDONLY))
3725 es->s_flags |=
3726 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3727#endif
23301410 3728 }
f99b2589 3729 }
ac27a0ec 3730
281b5995
TT		 3731 /* Handle clustersize */
3732 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3733 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3734 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3735 if (has_bigalloc) {
3736 if (clustersize < blocksize) {
3737 ext4_msg(sb, KERN_ERR,
3738 "cluster size (%d) smaller than "
3739 "block size (%d)", clustersize, blocksize);
3740 goto failed_mount;
3741 }
3742 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3743 le32_to_cpu(es->s_log_block_size);
3744 sbi->s_clusters_per_group =
3745 le32_to_cpu(es->s_clusters_per_group);
3746 if (sbi->s_clusters_per_group > blocksize * 8) {
3747 ext4_msg(sb, KERN_ERR,
3748 "#clusters per group too big: %lu",
3749 sbi->s_clusters_per_group);
3750 goto failed_mount;
3751 }
3752 if (sbi->s_blocks_per_group !=
3753 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3754 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3755 "clusters per group (%lu) inconsistent",
3756 sbi->s_blocks_per_group,
3757 sbi->s_clusters_per_group);
3758 goto failed_mount;
3759 }
3760 } else {
3761 if (clustersize != blocksize) {
3762 ext4_warning(sb, "fragment/cluster size (%d) != "
3763 "block size (%d)", clustersize,
3764 blocksize);
3765 clustersize = blocksize;
3766 }
3767 if (sbi->s_blocks_per_group > blocksize * 8) {
3768 ext4_msg(sb, KERN_ERR,
3769 "#blocks per group too big: %lu",
3770 sbi->s_blocks_per_group);
3771 goto failed_mount;
3772 }
3773 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3774 sbi->s_cluster_bits = 0;
ac27a0ec 3775 }
281b5995
TT		 3776 sbi->s_cluster_ratio = clustersize / blocksize;
3777
ac27a0ec 3778 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3779 ext4_msg(sb, KERN_ERR,
3780 "#inodes per group too big: %lu",
2b2d6d01 3781 sbi->s_inodes_per_group);
ac27a0ec
DK		 3782 goto failed_mount;
3783 }
3784
960fd856
TT		 3785 /* Do we have standard group size of clustersize * 8 blocks ? */
3786 if (sbi->s_blocks_per_group == clustersize << 3)
3787 set_opt2(sb, STD_GROUP_SIZE);
3788
bf43d84b
ES		 3789 /*
3790 * Test whether we have more sectors than will fit in sector_t,
3791 * and whether the max offset is addressable by the page cache.
3792 */
5a9ae68a 3793 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3794 ext4_blocks_count(es));
5a9ae68a 3795 if (err) {
b31e1552 3796 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3797 " too large to mount safely on this system");
ac27a0ec 3798 if (sizeof(sector_t) < 8)
90c699a9 3799 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3800 goto failed_mount;
3801 }
3802
617ba13b
MC		 3803 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3804 goto cantfind_ext4;
e7c95593 3805
0f2ddca6
FTN		 3806 /* check blocks count against device size */
3807 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3808 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3809 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3810 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3811 ext4_blocks_count(es), blocks_count);
3812 goto failed_mount;
3813 }
3814
0b8e58a1
AD		 3815 /*
3816 * It makes no sense for the first data block to be beyond the end
3817 * of the filesystem.
3818 */
3819 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3820 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3821 "block %u is beyond end of filesystem (%llu)",
3822 le32_to_cpu(es->s_first_data_block),
3823 ext4_blocks_count(es));
e7c95593
ES		 3824 goto failed_mount;
3825 }
bd81d8ee
LV		 3826 blocks_count = (ext4_blocks_count(es) -
3827 le32_to_cpu(es->s_first_data_block) +
3828 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3829 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3830 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3831 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3832 "(block count %llu, first data block %u, "
b31e1552 3833 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3834 ext4_blocks_count(es),
3835 le32_to_cpu(es->s_first_data_block),
3836 EXT4_BLOCKS_PER_GROUP(sb));
3837 goto failed_mount;
3838 }
bd81d8ee 3839 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3840 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3841 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3842 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3843 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3844 sbi->s_group_desc = ext4_kvmalloc(db_count *
3845 sizeof(struct buffer_head *),
3846 GFP_KERNEL);
ac27a0ec 3847 if (sbi->s_group_desc == NULL) {
b31e1552 3848 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3849 ret = -ENOMEM;
ac27a0ec
DK		 3850 goto failed_mount;
3851 }
3852
9f6200bb
TT		 3853 if (ext4_proc_root)
3854 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3855
66acdcf4
TT		 3856 if (sbi->s_proc)
3857 proc_create_data("options", S_IRUGO, sbi->s_proc,
3858 &ext4_seq_options_fops, sb);
3859
705895b6 3860 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3861
3862 for (i = 0; i < db_count; i++) {
70bbb3e0 3863 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3864 sbi->s_group_desc[i] = sb_bread(sb, block);
3865 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3866 ext4_msg(sb, KERN_ERR,
3867 "can't read group descriptor %d", i);
ac27a0ec
DK		 3868 db_count = i;
3869 goto failed_mount2;
3870 }
3871 }
00764937
AK		 3872
3873 /*
3874 * set up enough so that it can read an inode,
3875 * and create new inode for buddy allocator
3876 */
3877 sbi->s_gdb_count = db_count;
3878 if (!test_opt(sb, NOLOAD) &&
3879 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3880 sb->s_op = &ext4_sops;
3881 else
3882 sb->s_op = &ext4_nojournal_sops;
3883
3884 ext4_ext_init(sb);
3885 err = ext4_mb_init(sb);
3886 if (err) {
3887 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3888 err);
3889 goto failed_mount2;
3890 }
3891
bfff6873 3892 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3893 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
00764937 3894 goto failed_mount2a;
ac27a0ec 3895 }
772cb7c8
JS		 3896 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3897 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3898 ext4_msg(sb, KERN_ERR,
3899 "unable to initialize "
3900 "flex_bg meta info!");
00764937 3901 goto failed_mount2a;
772cb7c8
JS		 3902 }
3903
ac27a0ec
DK		 3904 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3905 spin_lock_init(&sbi->s_next_gen_lock);
3906
04496411
TM		 3907 init_timer(&sbi->s_err_report);
3908 sbi->s_err_report.function = print_daily_error_info;
3909 sbi->s_err_report.data = (unsigned long) sb;
3910
a75ae78f 3911 /* Register extent status tree shrinker */
d3922a77 3912 ext4_es_register_shrinker(sbi);
a75ae78f 3913
57042651 3914 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3915 ext4_count_free_clusters(sb));
ce7e010a
TT		 3916 if (!err) {
3917 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3918 ext4_count_free_inodes(sb));
3919 }
3920 if (!err) {
3921 err = percpu_counter_init(&sbi->s_dirs_counter,
3922 ext4_count_dirs(sb));
3923 }
3924 if (!err) {
57042651 3925 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a 3926 }
1ac6466f
TT		 3927 if (!err) {
3928 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3929 }
ce7e010a
TT		 3930 if (err) {
3931 ext4_msg(sb, KERN_ERR, "insufficient memory");
3932 goto failed_mount3;
3933 }
3934
c9de560d 3935 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3936 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3937
617ba13b
MC		 3938 sb->s_export_op = &ext4_export_ops;
3939 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3940#ifdef CONFIG_QUOTA
617ba13b 3941 sb->dq_op = &ext4_quota_operations;
262b4662 3942 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3943 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3944 else
3945 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3946#endif
f2fa2ffc
AK		 3947 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3948
ac27a0ec 3949 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3950 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3951
3952 sb->s_root = NULL;
3953
3954 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3955 EXT4_HAS_INCOMPAT_FEATURE(sb,
3956 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3957
c5e06d10
JL		 3958 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3959 !(sb->s_flags & MS_RDONLY))
3960 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3961 goto failed_mount3;
3962
ac27a0ec
DK		 3963 /*
3964 * The first inode we look at is the journal inode. Don't try
3965 * root first: it may be modified in the journal!
3966 */
3967 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3968 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3969 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3970 goto failed_mount3;
0390131b
FM		 3971 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3972 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3973 ext4_msg(sb, KERN_ERR, "required journal recovery "
3974 "suppressed and not mounted read-only");
744692dc 3975 goto failed_mount_wq;
ac27a0ec 3976 } else {
fd8c37ec 3977 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3978 sbi->s_journal = NULL;
3979 needs_recovery = 0;
3980 goto no_journal;
ac27a0ec
DK		 3981 }
3982
f32aaf2d 3983 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3984 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3985 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3986 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3987 goto failed_mount_wq;
eb40a09c
JS		 3988 }
3989
25ed6e8a
DW		 3990 if (!set_journal_csum_feature_set(sb)) {
3991 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3992 "feature set");
3993 goto failed_mount_wq;
d4da6c9c 3994 }
818d276c 3995
ac27a0ec
DK		 3996 /* We have now updated the journal if required, so we can
3997 * validate the data journaling mode. */
3998 switch (test_opt(sb, DATA_FLAGS)) {
3999 case 0:
4000 /* No mode set, assume a default based on the journal
63f57933
AM		 4001 * capabilities: ORDERED_DATA if the journal can
4002 * cope, else JOURNAL_DATA
4003 */
dab291af
MC		 4004 if (jbd2_journal_check_available_features
4005 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4006 set_opt(sb, ORDERED_DATA);
ac27a0ec 4007 else
fd8c37ec 4008 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4009 break;
4010
617ba13b
MC		 4011 case EXT4_MOUNT_ORDERED_DATA:
4012 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4013 if (!jbd2_journal_check_available_features
4014 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4015 ext4_msg(sb, KERN_ERR, "Journal does not support "
4016 "requested data journaling mode");
744692dc 4017 goto failed_mount_wq;
ac27a0ec
DK		 4018 }
4019 default:
4020 break;
4021 }
b3881f74 4022 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4023
18aadd47
BJ		 4024 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4025
ce7e010a
TT		 4026 /*
4027 * The journal may have updated the bg summary counts, so we
4028 * need to update the global counters.
4029 */
57042651 4030 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 4031 ext4_count_free_clusters(sb));
ce7e010a
TT		 4032 percpu_counter_set(&sbi->s_freeinodes_counter,
4033 ext4_count_free_inodes(sb));
4034 percpu_counter_set(&sbi->s_dirs_counter,
4035 ext4_count_dirs(sb));
57042651 4036 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 4037
ce7e010a 4038no_journal:
9c191f70
M		 4039 if (ext4_mballoc_ready) {
4040 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4041 if (!sbi->s_mb_cache) {
4042 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4043 goto failed_mount_wq;
4044 }
4045 }
4046
952fc18e
TT		 4047 /*
4048 * Get the # of file system overhead blocks from the
4049 * superblock if present.
4050 */
4051 if (es->s_overhead_clusters)
4052 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4053 else {
07aa2ea1
LC		 4054 err = ext4_calculate_overhead(sb);
4055 if (err)
952fc18e
TT		 4056 goto failed_mount_wq;
4057 }
4058
fd89d5f2
TH		 4059 /*
4060 * The maximum number of concurrent works can be high and
4061 * concurrency isn't really necessary. Limit it to 1.
4062 */
2e8fa54e
JK		 4063 EXT4_SB(sb)->rsv_conversion_wq =
4064 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4065 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4066 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4067 ret = -ENOMEM;
2e8fa54e
JK		 4068 goto failed_mount4;
4069 }
4070
ac27a0ec 4071 /*
dab291af 4072 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4073 * so we can safely mount the rest of the filesystem now.
4074 */
4075
1d1fe1ee
DH		 4076 root = ext4_iget(sb, EXT4_ROOT_INO);
4077 if (IS_ERR(root)) {
b31e1552 4078 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4079 ret = PTR_ERR(root);
32a9bb57 4080 root = NULL;
ac27a0ec
DK		 4081 goto failed_mount4;
4082 }
4083 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4084 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4085 iput(root);
ac27a0ec
DK		 4086 goto failed_mount4;
4087 }
48fde701 4088 sb->s_root = d_make_root(root);
1d1fe1ee 4089 if (!sb->s_root) {
b31e1552 4090 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4091 ret = -ENOMEM;
4092 goto failed_mount4;
4093 }
ac27a0ec 4094
7e84b621
ES		 4095 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4096 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4097
4098 /* determine the minimum size of new large inodes, if present */
4099 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4100 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4101 EXT4_GOOD_OLD_INODE_SIZE;
4102 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4103 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4104 if (sbi->s_want_extra_isize <
4105 le16_to_cpu(es->s_want_extra_isize))
4106 sbi->s_want_extra_isize =
4107 le16_to_cpu(es->s_want_extra_isize);
4108 if (sbi->s_want_extra_isize <
4109 le16_to_cpu(es->s_min_extra_isize))
4110 sbi->s_want_extra_isize =
4111 le16_to_cpu(es->s_min_extra_isize);
4112 }
4113 }
4114 /* Check if enough inode space is available */
4115 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4116 sbi->s_inode_size) {
4117 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4118 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4119 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4120 "available");
ef7f3835
KS		 4121 }
4122
30fac0f7 4123 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4124 if (err) {
4125 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4126 "reserved pool", ext4_calculate_resv_clusters(sb));
00764937 4127 goto failed_mount5;
27dd4385
LC		 4128 }
4129
6fd058f7
TT		 4130 err = ext4_setup_system_zone(sb);
4131 if (err) {
b31e1552 4132 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4133 "zone (%d)", err);
dcf2d804 4134 goto failed_mount5;
c2774d84
AK		 4135 }
4136
bfff6873
LC		 4137 err = ext4_register_li_request(sb, first_not_zeroed);
4138 if (err)
dcf2d804 4139 goto failed_mount6;
bfff6873 4140
3197ebdb
TT		 4141 sbi->s_kobj.kset = ext4_kset;
4142 init_completion(&sbi->s_kobj_unregister);
4143 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4144 "%s", sb->s_id);
dcf2d804
TM		 4145 if (err)
4146 goto failed_mount7;
3197ebdb 4147
9b2ff357
JK		 4148#ifdef CONFIG_QUOTA
4149 /* Enable quota usage during mount. */
4150 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4151 !(sb->s_flags & MS_RDONLY)) {
4152 err = ext4_enable_quotas(sb);
4153 if (err)
4154 goto failed_mount8;
4155 }
4156#endif /* CONFIG_QUOTA */
4157
617ba13b
MC		 4158 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4159 ext4_orphan_cleanup(sb, es);
4160 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4161 if (needs_recovery) {
b31e1552 4162 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4163 ext4_mark_recovery_complete(sb, es);
4164 }
4165 if (EXT4_SB(sb)->s_journal) {
4166 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4167 descr = " journalled data mode";
4168 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4169 descr = " ordered data mode";
4170 else
4171 descr = " writeback data mode";
4172 } else
4173 descr = "out journal";
4174
79add3a3
LC		 4175 if (test_opt(sb, DISCARD)) {
4176 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4177 if (!blk_queue_discard(q))
4178 ext4_msg(sb, KERN_WARNING,
4179 "mounting with \"discard\" option, but "
4180 "the device does not support discard");
4181 }
4182
d4c402d9 4183 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4184 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4185 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4186
66e61a9e
TT		 4187 if (es->s_error_count)
4188 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4189
efbed4dc
TT		 4190 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4191 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4192 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4193 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4194
d4c402d9 4195 kfree(orig_data);
ac27a0ec
DK		 4196 return 0;
4197
617ba13b 4198cantfind_ext4:
ac27a0ec 4199 if (!silent)
b31e1552 4200 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4201 goto failed_mount;
4202
72ba7450
TT		 4203#ifdef CONFIG_QUOTA
4204failed_mount8:
4205 kobject_del(&sbi->s_kobj);
4206#endif
dcf2d804
TM		 4207failed_mount7:
4208 ext4_unregister_li_request(sb);
4209failed_mount6:
dcf2d804 4210 ext4_release_system_zone(sb);
00764937 4211failed_mount5:
94bf608a 4212 dput(sb->s_root);
32a9bb57 4213 sb->s_root = NULL;
94bf608a 4214failed_mount4:
b31e1552 4215 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4216 if (EXT4_SB(sb)->rsv_conversion_wq)
4217 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4218failed_mount_wq:
0390131b
FM		 4219 if (sbi->s_journal) {
4220 jbd2_journal_destroy(sbi->s_journal);
4221 sbi->s_journal = NULL;
4222 }
ac27a0ec 4223failed_mount3:
d3922a77 4224 ext4_es_unregister_shrinker(sbi);
9105bb14 4225 del_timer_sync(&sbi->s_err_report);
9933fc0a
TT		 4226 if (sbi->s_flex_groups)
4227 ext4_kvfree(sbi->s_flex_groups);
57042651 4228 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4229 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4230 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4231 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 4232 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
c5e06d10
JL		 4233 if (sbi->s_mmp_tsk)
4234 kthread_stop(sbi->s_mmp_tsk);
00764937
AK		 4235failed_mount2a:
4236 ext4_mb_release(sb);
ac27a0ec
DK		 4237failed_mount2:
4238 for (i = 0; i < db_count; i++)
4239 brelse(sbi->s_group_desc[i]);
f18a5f21 4240 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4241failed_mount:
00764937 4242 ext4_ext_release(sb);
0441984a
DW		 4243 if (sbi->s_chksum_driver)
4244 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4245 if (sbi->s_proc) {
66acdcf4 4246 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4247 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4248 }
ac27a0ec
DK		 4249#ifdef CONFIG_QUOTA
4250 for (i = 0; i < MAXQUOTAS; i++)
4251 kfree(sbi->s_qf_names[i]);
4252#endif
617ba13b 4253 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4254 brelse(bh);
4255out_fail:
4256 sb->s_fs_info = NULL;
f6830165 4257 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4258 kfree(sbi);
dcc7dae3 4259out_free_orig:
d4c402d9 4260 kfree(orig_data);
07aa2ea1 4261 return err ? err : ret;
ac27a0ec
DK		 4262}
4263
4264/*
4265 * Setup any per-fs journal parameters now. We'll do this both on
4266 * initial mount, once the journal has been initialised but before we've
4267 * done any recovery; and again on any subsequent remount.
4268 */
617ba13b 4269static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4270{
617ba13b 4271 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4272
30773840
TT		 4273 journal->j_commit_interval = sbi->s_commit_interval;
4274 journal->j_min_batch_time = sbi->s_min_batch_time;
4275 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4276
a931da6a 4277 write_lock(&journal->j_state_lock);
ac27a0ec 4278 if (test_opt(sb, BARRIER))
dab291af 4279 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4280 else
dab291af 4281 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4282 if (test_opt(sb, DATA_ERR_ABORT))
4283 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4284 else
4285 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4286 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4287}
4288
617ba13b 4289static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4290 unsigned int journal_inum)
4291{
4292 struct inode *journal_inode;
4293 journal_t *journal;
4294
0390131b
FM		 4295 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4296
ac27a0ec
DK		 4297 /* First, test for the existence of a valid inode on disk. Bad
4298 * things happen if we iget() an unused inode, as the subsequent
4299 * iput() will try to delete it. */
4300
1d1fe1ee
DH		 4301 journal_inode = ext4_iget(sb, journal_inum);
4302 if (IS_ERR(journal_inode)) {
b31e1552 4303 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4304 return NULL;
4305 }
4306 if (!journal_inode->i_nlink) {
4307 make_bad_inode(journal_inode);
4308 iput(journal_inode);
b31e1552 4309 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4310 return NULL;
4311 }
4312
e5f8eab8 4313 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4314 journal_inode, journal_inode->i_size);
1d1fe1ee 4315 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4316 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4317 iput(journal_inode);
4318 return NULL;
4319 }
4320
dab291af 4321 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4322 if (!journal) {
b31e1552 4323 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4324 iput(journal_inode);
4325 return NULL;
4326 }
4327 journal->j_private = sb;
617ba13b 4328 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4329 return journal;
4330}
4331
617ba13b 4332static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4333 dev_t j_dev)
4334{
2b2d6d01 4335 struct buffer_head *bh;
ac27a0ec 4336 journal_t *journal;
617ba13b
MC		 4337 ext4_fsblk_t start;
4338 ext4_fsblk_t len;
ac27a0ec 4339 int hblock, blocksize;
617ba13b 4340 ext4_fsblk_t sb_block;
ac27a0ec 4341 unsigned long offset;
2b2d6d01 4342 struct ext4_super_block *es;
ac27a0ec
DK		 4343 struct block_device *bdev;
4344
0390131b
FM		 4345 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4346
b31e1552 4347 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4348 if (bdev == NULL)
4349 return NULL;
4350
ac27a0ec 4351 blocksize = sb->s_blocksize;
e1defc4f 4352 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4353 if (blocksize < hblock) {
b31e1552
ES		 4354 ext4_msg(sb, KERN_ERR,
4355 "blocksize too small for journal device");
ac27a0ec
DK		 4356 goto out_bdev;
4357 }
4358
617ba13b
MC		 4359 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4360 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4361 set_blocksize(bdev, blocksize);
4362 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4363 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4364 "external journal");
ac27a0ec
DK		 4365 goto out_bdev;
4366 }
4367
2716b802 4368 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4369 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4370 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4371 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4372 ext4_msg(sb, KERN_ERR, "external journal has "
4373 "bad superblock");
ac27a0ec
DK		 4374 brelse(bh);
4375 goto out_bdev;
4376 }
4377
617ba13b 4378 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4379 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4380 brelse(bh);
4381 goto out_bdev;
4382 }
4383
bd81d8ee 4384 len = ext4_blocks_count(es);
ac27a0ec
DK		 4385 start = sb_block + 1;
4386 brelse(bh); /* we're done with the superblock */
4387
dab291af 4388 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4389 start, len, blocksize);
4390 if (!journal) {
b31e1552 4391 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4392 goto out_bdev;
4393 }
4394 journal->j_private = sb;
9f203507 4395 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4396 wait_on_buffer(journal->j_sb_buffer);
4397 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4398 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4399 goto out_journal;
4400 }
4401 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4402 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4403 "user (unsupported) - %d",
ac27a0ec
DK		 4404 be32_to_cpu(journal->j_superblock->s_nr_users));
4405 goto out_journal;
4406 }
617ba13b
MC		 4407 EXT4_SB(sb)->journal_bdev = bdev;
4408 ext4_init_journal_params(sb, journal);
ac27a0ec 4409 return journal;
0b8e58a1 4410
ac27a0ec 4411out_journal:
dab291af 4412 jbd2_journal_destroy(journal);
ac27a0ec 4413out_bdev:
617ba13b 4414 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4415 return NULL;
4416}
4417
617ba13b
MC		 4418static int ext4_load_journal(struct super_block *sb,
4419 struct ext4_super_block *es,
ac27a0ec
DK		 4420 unsigned long journal_devnum)
4421{
4422 journal_t *journal;
4423 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4424 dev_t journal_dev;
4425 int err = 0;
4426 int really_read_only;
4427
0390131b
FM		 4428 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4429
ac27a0ec
DK		 4430 if (journal_devnum &&
4431 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4432 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4433 "numbers have changed");
ac27a0ec
DK		 4434 journal_dev = new_decode_dev(journal_devnum);
4435 } else
4436 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4437
4438 really_read_only = bdev_read_only(sb->s_bdev);
4439
4440 /*
4441 * Are we loading a blank journal or performing recovery after a
4442 * crash? For recovery, we need to check in advance whether we
4443 * can get read-write access to the device.
4444 */
617ba13b 4445 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4446 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4447 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4448 "required on readonly filesystem");
ac27a0ec 4449 if (really_read_only) {
b31e1552
ES		 4450 ext4_msg(sb, KERN_ERR, "write access "
4451 "unavailable, cannot proceed");
ac27a0ec
DK		 4452 return -EROFS;
4453 }
b31e1552
ES		 4454 ext4_msg(sb, KERN_INFO, "write access will "
4455 "be enabled during recovery");
ac27a0ec
DK		 4456 }
4457 }
4458
4459 if (journal_inum && journal_dev) {
b31e1552
ES		 4460 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4461 "and inode journals!");
ac27a0ec
DK		 4462 return -EINVAL;
4463 }
4464
4465 if (journal_inum) {
617ba13b 4466 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4467 return -EINVAL;
4468 } else {
617ba13b 4469 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4470 return -EINVAL;
4471 }
4472
90576c0b 4473 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4474 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4475
617ba13b 4476 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4477 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4478 if (!err) {
4479 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4480 if (save)
4481 memcpy(save, ((char *) es) +
4482 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4483 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4484 if (save)
4485 memcpy(((char *) es) + EXT4_S_ERR_START,
4486 save, EXT4_S_ERR_LEN);
4487 kfree(save);
4488 }
ac27a0ec
DK		 4489
4490 if (err) {
b31e1552 4491 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4492 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4493 return err;
4494 }
4495
617ba13b
MC		 4496 EXT4_SB(sb)->s_journal = journal;
4497 ext4_clear_journal_err(sb, es);
ac27a0ec 4498
c41303ce 4499 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4500 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4501 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4502
4503 /* Make sure we flush the recovery flag to disk. */
e2d67052 4504 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4505 }
4506
4507 return 0;
4508}
4509
e2d67052 4510static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4511{
e2d67052 4512 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4513 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4514 int error = 0;
ac27a0ec 4515
7c2e7087 4516 if (!sbh || block_device_ejected(sb))
c4be0c1d 4517 return error;
914258bf
TT		 4518 if (buffer_write_io_error(sbh)) {
4519 /*
4520 * Oh, dear. A previous attempt to write the
4521 * superblock failed. This could happen because the
4522 * USB device was yanked out. Or it could happen to
4523 * be a transient write error and maybe the block will
4524 * be remapped. Nothing we can do but to retry the
4525 * write and hope for the best.
4526 */
b31e1552
ES		 4527 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4528 "superblock detected");
914258bf
TT		 4529 clear_buffer_write_io_error(sbh);
4530 set_buffer_uptodate(sbh);
4531 }
71290b36
TT		 4532 /*
4533 * If the file system is mounted read-only, don't update the
4534 * superblock write time. This avoids updating the superblock
4535 * write time when we are mounting the root file system
4536 * read/only but we need to replay the journal; at that point,
4537 * for people who are east of GMT and who make their clock
4538 * tick in localtime for Windows bug-for-bug compatibility,
4539 * the clock is set in the future, and this will cause e2fsck
4540 * to complain and force a full file system check.
4541 */
4542 if (!(sb->s_flags & MS_RDONLY))
4543 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4544 if (sb->s_bdev->bd_part)
4545 es->s_kbytes_written =
4546 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4547 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4548 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4549 else
4550 es->s_kbytes_written =
4551 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4552 ext4_free_blocks_count_set(es,
4553 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4554 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4555 es->s_free_inodes_count =
4556 cpu_to_le32(percpu_counter_sum_positive(
4557 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4558 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4559 ext4_superblock_csum_set(sb);
ac27a0ec 4560 mark_buffer_dirty(sbh);
914258bf 4561 if (sync) {
c4be0c1d
TS		 4562 error = sync_dirty_buffer(sbh);
4563 if (error)
4564 return error;
4565
4566 error = buffer_write_io_error(sbh);
4567 if (error) {
b31e1552
ES		 4568 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4569 "superblock");
914258bf
TT		 4570 clear_buffer_write_io_error(sbh);
4571 set_buffer_uptodate(sbh);
4572 }
4573 }
c4be0c1d 4574 return error;
ac27a0ec
DK		 4575}
4576
ac27a0ec
DK		 4577/*
4578 * Have we just finished recovery? If so, and if we are mounting (or
4579 * remounting) the filesystem readonly, then we will end up with a
4580 * consistent fs on disk. Record that fact.
4581 */
2b2d6d01
TT		 4582static void ext4_mark_recovery_complete(struct super_block *sb,
4583 struct ext4_super_block *es)
ac27a0ec 4584{
617ba13b 4585 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4586
0390131b
FM		 4587 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4588 BUG_ON(journal != NULL);
4589 return;
4590 }
dab291af 4591 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4592 if (jbd2_journal_flush(journal) < 0)
4593 goto out;
4594
617ba13b 4595 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4596 sb->s_flags & MS_RDONLY) {
617ba13b 4597 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4598 ext4_commit_super(sb, 1);
ac27a0ec 4599 }
7ffe1ea8
HK		 4600
4601out:
dab291af 4602 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4603}
4604
4605/*
4606 * If we are mounting (or read-write remounting) a filesystem whose journal
4607 * has recorded an error from a previous lifetime, move that error to the
4608 * main filesystem now.
4609 */
2b2d6d01
TT		 4610static void ext4_clear_journal_err(struct super_block *sb,
4611 struct ext4_super_block *es)
ac27a0ec
DK		 4612{
4613 journal_t *journal;
4614 int j_errno;
4615 const char *errstr;
4616
0390131b
FM		 4617 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4618
617ba13b 4619 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4620
4621 /*
4622 * Now check for any error status which may have been recorded in the
617ba13b 4623 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4624 */
4625
dab291af 4626 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4627 if (j_errno) {
4628 char nbuf[16];
4629
617ba13b 4630 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4631 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4632 "from previous mount: %s", errstr);
12062ddd 4633 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4634
617ba13b
MC		 4635 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4636 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4637 ext4_commit_super(sb, 1);
ac27a0ec 4638
dab291af 4639 jbd2_journal_clear_err(journal);
d796c52e 4640 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4641 }
4642}
4643
4644/*
4645 * Force the running and committing transactions to commit,
4646 * and wait on the commit.
4647 */
617ba13b 4648int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4649{
4650 journal_t *journal;
ac27a0ec
DK		 4651
4652 if (sb->s_flags & MS_RDONLY)
4653 return 0;
4654
617ba13b 4655 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4656 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4657}
4658
617ba13b 4659static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4660{
14ce0cb4 4661 int ret = 0;
9eddacf9 4662 tid_t target;
06a407f1 4663 bool needs_barrier = false;
8d5d02e6 4664 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4665
9bffad1e 4666 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4667 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4668 /*
4669 * Writeback quota in non-journalled quota case - journalled quota has
4670 * no dirty dquots
4671 */
4672 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4673 /*
4674 * Data writeback is possible w/o journal transaction, so barrier must
4675 * being sent at the end of the function. But we can skip it if
4676 * transaction_commit will do it for us.
4677 */
4678 target = jbd2_get_latest_transaction(sbi->s_journal);
4679 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4680 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4681 needs_barrier = true;
4682
8d5d02e6 4683 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4684 if (wait)
06a407f1
DM		 4685 ret = jbd2_log_wait_commit(sbi->s_journal, target);
4686 }
4687 if (needs_barrier) {
4688 int err;
4689 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4690 if (!ret)
4691 ret = err;
0390131b 4692 }
06a407f1
DM		 4693
4694 return ret;
4695}
4696
4697static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
4698{
4699 int ret = 0;
4700
4701 trace_ext4_sync_fs(sb, wait);
4702 flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
06a407f1
DM		 4703 dquot_writeback_dquots(sb, -1);
4704 if (wait && test_opt(sb, BARRIER))
4705 ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4706
14ce0cb4 4707 return ret;
ac27a0ec
DK		 4708}
4709
4710/*
4711 * LVM calls this function before a (read-only) snapshot is created. This
4712 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4713 *
4714 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4715 * state independently. It relies on upper layer to stop all data & metadata
4716 * modifications.
ac27a0ec 4717 */
c4be0c1d 4718static int ext4_freeze(struct super_block *sb)
ac27a0ec 4719{
c4be0c1d
TS		 4720 int error = 0;
4721 journal_t *journal;
ac27a0ec 4722
9ca92389
TT		 4723 if (sb->s_flags & MS_RDONLY)
4724 return 0;
ac27a0ec 4725
9ca92389 4726 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4727
9ca92389
TT		 4728 /* Now we set up the journal barrier. */
4729 jbd2_journal_lock_updates(journal);
ac27a0ec 4730
9ca92389
TT		 4731 /*
4732 * Don't clear the needs_recovery flag if we failed to flush
4733 * the journal.
4734 */
4735 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4736 if (error < 0)
4737 goto out;
9ca92389
TT		 4738
4739 /* Journal blocked and flushed, clear needs_recovery flag. */
4740 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4741 error = ext4_commit_super(sb, 1);
6b0310fb 4742out:
8e8ad8a5 4743 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4744 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4745 return error;
ac27a0ec
DK		 4746}
4747
4748/*
4749 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4750 * flag here, even though the filesystem is not technically dirty yet.
4751 */
c4be0c1d 4752static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4753{
9ca92389
TT		 4754 if (sb->s_flags & MS_RDONLY)
4755 return 0;
4756
9ca92389
TT		 4757 /* Reset the needs_recovery flag before the fs is unlocked. */
4758 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4759 ext4_commit_super(sb, 1);
c4be0c1d 4760 return 0;
ac27a0ec
DK		 4761}
4762
673c6100
TT		 4763/*
4764 * Structure to save mount options for ext4_remount's benefit
4765 */
4766struct ext4_mount_options {
4767 unsigned long s_mount_opt;
a2595b8a 4768 unsigned long s_mount_opt2;
08cefc7a
EB		 4769 kuid_t s_resuid;
4770 kgid_t s_resgid;
673c6100
TT		 4771 unsigned long s_commit_interval;
4772 u32 s_min_batch_time, s_max_batch_time;
4773#ifdef CONFIG_QUOTA
4774 int s_jquota_fmt;
4775 char *s_qf_names[MAXQUOTAS];
4776#endif
4777};
4778
2b2d6d01 4779static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4780{
2b2d6d01 4781 struct ext4_super_block *es;
617ba13b 4782 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4783 unsigned long old_sb_flags;
617ba13b 4784 struct ext4_mount_options old_opts;
c79d967d 4785 int enable_quota = 0;
8a266467 4786 ext4_group_t g;
b3881f74 4787 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4788 int err = 0;
ac27a0ec 4789#ifdef CONFIG_QUOTA
03dafb5f 4790 int i, j;
ac27a0ec 4791#endif
d4c402d9 4792 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4793
4794 /* Store the original options */
4795 old_sb_flags = sb->s_flags;
4796 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4797 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4798 old_opts.s_resuid = sbi->s_resuid;
4799 old_opts.s_resgid = sbi->s_resgid;
4800 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4801 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4802 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4803#ifdef CONFIG_QUOTA
4804 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4805 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f
CG		 4806 if (sbi->s_qf_names[i]) {
4807 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4808 GFP_KERNEL);
4809 if (!old_opts.s_qf_names[i]) {
4810 for (j = 0; j < i; j++)
4811 kfree(old_opts.s_qf_names[j]);
3e36a163 4812 kfree(orig_data);
03dafb5f
CG		 4813 return -ENOMEM;
4814 }
4815 } else
4816 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4817#endif
b3881f74
TT		 4818 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4819 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4820
4821 /*
4822 * Allow the "check" option to be passed as a remount option.
4823 */
661aa520 4824 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4825 err = -EINVAL;
4826 goto restore_opts;
4827 }
4828
6ae6514b
PS		 4829 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4830 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4831 ext4_msg(sb, KERN_ERR, "can't mount with "
4832 "both data=journal and delalloc");
4833 err = -EINVAL;
4834 goto restore_opts;
4835 }
4836 if (test_opt(sb, DIOREAD_NOLOCK)) {
4837 ext4_msg(sb, KERN_ERR, "can't mount with "
4838 "both data=journal and dioread_nolock");
4839 err = -EINVAL;
4840 goto restore_opts;
4841 }
4842 }
4843
4ab2f15b 4844 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4845 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4846
4847 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4848 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4849
4850 es = sbi->s_es;
4851
b3881f74 4852 if (sbi->s_journal) {
0390131b 4853 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4854 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4855 }
ac27a0ec 4856
661aa520 4857 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4858 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4859 err = -EROFS;
4860 goto restore_opts;
4861 }
4862
4863 if (*flags & MS_RDONLY) {
38c03b34
TT		 4864 err = sync_filesystem(sb);
4865 if (err < 0)
4866 goto restore_opts;
0f0dd62f
CH		 4867 err = dquot_suspend(sb, -1);
4868 if (err < 0)
c79d967d 4869 goto restore_opts;
c79d967d 4870
ac27a0ec
DK		 4871 /*
4872 * First of all, the unconditional stuff we have to do
4873 * to disable replay of the journal when we next remount
4874 */
4875 sb->s_flags |= MS_RDONLY;
4876
4877 /*
4878 * OK, test if we are remounting a valid rw partition
4879 * readonly, and if so set the rdonly flag and then
4880 * mark the partition as valid again.
4881 */
617ba13b
MC		 4882 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4883 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4884 es->s_state = cpu_to_le16(sbi->s_mount_state);
4885
a63c9eb2 4886 if (sbi->s_journal)
0390131b 4887 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4888 } else {
a13fb1a4
ES		 4889 /* Make sure we can mount this feature set readwrite */
4890 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4891 err = -EROFS;
4892 goto restore_opts;
4893 }
8a266467
TT		 4894 /*
4895 * Make sure the group descriptor checksums
0b8e58a1 4896 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4897 */
4898 for (g = 0; g < sbi->s_groups_count; g++) {
4899 struct ext4_group_desc *gdp =
4900 ext4_get_group_desc(sb, g, NULL);
4901
feb0ab32 4902 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4903 ext4_msg(sb, KERN_ERR,
4904 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4905 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4906 le16_to_cpu(gdp->bg_checksum));
4907 err = -EINVAL;
4908 goto restore_opts;
4909 }
4910 }
4911
ead6596b
ES		 4912 /*
4913 * If we have an unprocessed orphan list hanging
4914 * around from a previously readonly bdev mount,
4915 * require a full umount/remount for now.
4916 */
4917 if (es->s_last_orphan) {
b31e1552 4918 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4919 "remount RDWR because of unprocessed "
4920 "orphan inode list. Please "
b31e1552 4921 "umount/remount instead");
ead6596b
ES		 4922 err = -EINVAL;
4923 goto restore_opts;
4924 }
4925
ac27a0ec
DK		 4926 /*
4927 * Mounting a RDONLY partition read-write, so reread
4928 * and store the current valid flag. (It may have
4929 * been changed by e2fsck since we originally mounted
4930 * the partition.)
4931 */
0390131b
FM		 4932 if (sbi->s_journal)
4933 ext4_clear_journal_err(sb, es);
ac27a0ec 4934 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4935 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4936 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4937 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4938 EXT4_FEATURE_INCOMPAT_MMP))
4939 if (ext4_multi_mount_protect(sb,
4940 le64_to_cpu(es->s_mmp_block))) {
4941 err = -EROFS;
4942 goto restore_opts;
4943 }
c79d967d 4944 enable_quota = 1;
ac27a0ec
DK		 4945 }
4946 }
bfff6873
LC		 4947
4948 /*
4949 * Reinitialize lazy itable initialization thread based on
4950 * current settings
4951 */
4952 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4953 ext4_unregister_li_request(sb);
4954 else {
4955 ext4_group_t first_not_zeroed;
4956 first_not_zeroed = ext4_has_uninit_itable(sb);
4957 ext4_register_li_request(sb, first_not_zeroed);
4958 }
4959
6fd058f7 4960 ext4_setup_system_zone(sb);
d096ad0f 4961 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4962 ext4_commit_super(sb, 1);
0390131b 4963
ac27a0ec
DK		 4964#ifdef CONFIG_QUOTA
4965 /* Release old quota file names */
4966 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f 4967 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4968 if (enable_quota) {
4969 if (sb_any_quota_suspended(sb))
4970 dquot_resume(sb, -1);
4971 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4972 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4973 err = ext4_enable_quotas(sb);
07724f98 4974 if (err)
7c319d32 4975 goto restore_opts;
7c319d32
AK		 4976 }
4977 }
ac27a0ec 4978#endif
d4c402d9
CW		 4979
4980 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4981 kfree(orig_data);
ac27a0ec 4982 return 0;
0b8e58a1 4983
ac27a0ec
DK		 4984restore_opts:
4985 sb->s_flags = old_sb_flags;
4986 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4987 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4988 sbi->s_resuid = old_opts.s_resuid;
4989 sbi->s_resgid = old_opts.s_resgid;
4990 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4991 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4992 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4993#ifdef CONFIG_QUOTA
4994 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4995 for (i = 0; i < MAXQUOTAS; i++) {
03dafb5f 4996 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4997 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4998 }
4999#endif
d4c402d9 5000 kfree(orig_data);
ac27a0ec
DK		 5001 return err;
5002}
5003
2b2d6d01 5004static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5005{
5006 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5007 struct ext4_sb_info *sbi = EXT4_SB(sb);
5008 struct ext4_super_block *es = sbi->s_es;
27dd4385 5009 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5010 u64 fsid;
d02a9391 5011 s64 bfree;
27dd4385 5012 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5013
952fc18e
TT		 5014 if (!test_opt(sb, MINIX_DF))
5015 overhead = sbi->s_overhead;
ac27a0ec 5016
617ba13b 5017 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5018 buf->f_bsize = sb->s_blocksize;
b72f78cb 5019 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5020 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5021 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5022 /* prevent underflow in case that few free space is available */
57042651 5023 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5024 buf->f_bavail = buf->f_bfree -
5025 (ext4_r_blocks_count(es) + resv_blocks);
5026 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5027 buf->f_bavail = 0;
5028 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5029 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5030 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5031 fsid = le64_to_cpup((void *)es->s_uuid) ^
5032 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5033 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5034 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5035
ac27a0ec
DK		 5036 return 0;
5037}
5038
0b8e58a1
AD		 5039/* Helper function for writing quotas on sync - we need to start transaction
5040 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5041 * Process 1 Process 2
617ba13b 5042 * ext4_create() quota_sync()
a269eb18 5043 * jbd2_journal_start() write_dquot()
871a2931 5044 * dquot_initialize() down(dqio_mutex)
dab291af 5045 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5046 *
5047 */
5048
5049#ifdef CONFIG_QUOTA
5050
5051static inline struct inode *dquot_to_inode(struct dquot *dquot)
5052{
4c376dca 5053 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5054}
5055
617ba13b 5056static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5057{
5058 int ret, err;
5059 handle_t *handle;
5060 struct inode *inode;
5061
5062 inode = dquot_to_inode(dquot);
9924a92a 5063 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5064 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5065 if (IS_ERR(handle))
5066 return PTR_ERR(handle);
5067 ret = dquot_commit(dquot);
617ba13b 5068 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5069 if (!ret)
5070 ret = err;
5071 return ret;
5072}
5073
617ba13b 5074static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5075{
5076 int ret, err;
5077 handle_t *handle;
5078
9924a92a 5079 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5080 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5081 if (IS_ERR(handle))
5082 return PTR_ERR(handle);
5083 ret = dquot_acquire(dquot);
617ba13b 5084 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5085 if (!ret)
5086 ret = err;
5087 return ret;
5088}
5089
617ba13b 5090static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5091{
5092 int ret, err;
5093 handle_t *handle;
5094
9924a92a 5095 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5096 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5097 if (IS_ERR(handle)) {
5098 /* Release dquot anyway to avoid endless cycle in dqput() */
5099 dquot_release(dquot);
ac27a0ec 5100 return PTR_ERR(handle);
9c3013e9 5101 }
ac27a0ec 5102 ret = dquot_release(dquot);
617ba13b 5103 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5104 if (!ret)
5105 ret = err;
5106 return ret;
5107}
5108
617ba13b 5109static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5110{
262b4662
JK		 5111 struct super_block *sb = dquot->dq_sb;
5112 struct ext4_sb_info *sbi = EXT4_SB(sb);
5113
2c8be6b2 5114 /* Are we journaling quotas? */
262b4662
JK		 5115 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5116 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5117 dquot_mark_dquot_dirty(dquot);
617ba13b 5118 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5119 } else {
5120 return dquot_mark_dquot_dirty(dquot);
5121 }
5122}
5123
617ba13b 5124static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5125{
5126 int ret, err;
5127 handle_t *handle;
5128
5129 /* Data block + inode block */
9924a92a 5130 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5131 if (IS_ERR(handle))
5132 return PTR_ERR(handle);
5133 ret = dquot_commit_info(sb, type);
617ba13b 5134 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5135 if (!ret)
5136 ret = err;
5137 return ret;
5138}
5139
5140/*
5141 * Turn on quotas during mount time - we need to find
5142 * the quota file and such...
5143 */
617ba13b 5144static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5145{
287a8095
CH		 5146 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5147 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5148}
5149
5150/*
5151 * Standard function to be called on quota_on
5152 */
617ba13b 5153static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5154 struct path *path)
ac27a0ec
DK		 5155{
5156 int err;
ac27a0ec
DK		 5157
5158 if (!test_opt(sb, QUOTA))
5159 return -EINVAL;
0623543b 5160
ac27a0ec 5161 /* Quotafile not on the same filesystem? */
d8c9584e 5162 if (path->dentry->d_sb != sb)
ac27a0ec 5163 return -EXDEV;
0623543b
JK		 5164 /* Journaling quota? */
5165 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5166 /* Quotafile not in fs root? */
f00c9e44 5167 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5168 ext4_msg(sb, KERN_WARNING,
5169 "Quota file not on filesystem root. "
5170 "Journaled quota will not work");
2b2d6d01 5171 }
0623543b
JK		 5172
5173 /*
5174 * When we journal data on quota file, we have to flush journal to see
5175 * all updates to the file when we bypass pagecache...
5176 */
0390131b 5177 if (EXT4_SB(sb)->s_journal &&
f00c9e44 5178 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 5179 /*
5180 * We don't need to lock updates but journal_flush() could
5181 * otherwise be livelocked...
5182 */
5183 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5184 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5185 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5186 if (err)
7ffe1ea8 5187 return err;
0623543b
JK		 5188 }
5189
f00c9e44 5190 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5191}
5192
7c319d32
AK		 5193static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5194 unsigned int flags)
5195{
5196 int err;
5197 struct inode *qf_inode;
5198 unsigned long qf_inums[MAXQUOTAS] = {
5199 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5200 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5201 };
5202
5203 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5204
5205 if (!qf_inums[type])
5206 return -EPERM;
5207
5208 qf_inode = ext4_iget(sb, qf_inums[type]);
5209 if (IS_ERR(qf_inode)) {
5210 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5211 return PTR_ERR(qf_inode);
5212 }
5213
bcb13850
JK		 5214 /* Don't account quota for quota files to avoid recursion */
5215 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5216 err = dquot_enable(qf_inode, type, format_id, flags);
5217 iput(qf_inode);
5218
5219 return err;
5220}
5221
5222/* Enable usage tracking for all quota types. */
5223static int ext4_enable_quotas(struct super_block *sb)
5224{
5225 int type, err = 0;
5226 unsigned long qf_inums[MAXQUOTAS] = {
5227 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5228 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5229 };
5230
5231 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5232 for (type = 0; type < MAXQUOTAS; type++) {
5233 if (qf_inums[type]) {
5234 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5235 DQUOT_USAGE_ENABLED);
5236 if (err) {
5237 ext4_warning(sb,
72ba7450
TT		 5238 "Failed to enable quota tracking "
5239 "(type=%d, err=%d). Please run "
5240 "e2fsck to fix.", type, err);
7c319d32
AK		 5241 return err;
5242 }
5243 }
5244 }
5245 return 0;
5246}
5247
5248/*
5249 * quota_on function that is used when QUOTA feature is set.
5250 */
5251static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5252 int format_id)
5253{
5254 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5255 return -EINVAL;
5256
5257 /*
5258 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5259 */
5260 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5261}
5262
ca0e05e4
DM		 5263static int ext4_quota_off(struct super_block *sb, int type)
5264{
21f97697
JK		 5265 struct inode *inode = sb_dqopt(sb)->files[type];
5266 handle_t *handle;
5267
87009d86
DM		 5268 /* Force all delayed allocation blocks to be allocated.
5269 * Caller already holds s_umount sem */
5270 if (test_opt(sb, DELALLOC))
ca0e05e4 5271 sync_filesystem(sb);
ca0e05e4 5272
0b268590
AG		 5273 if (!inode)
5274 goto out;
5275
21f97697
JK		 5276 /* Update modification times of quota files when userspace can
5277 * start looking at them */
9924a92a 5278 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5279 if (IS_ERR(handle))
5280 goto out;
5281 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5282 ext4_mark_inode_dirty(handle, inode);
5283 ext4_journal_stop(handle);
5284
5285out:
ca0e05e4
DM		 5286 return dquot_quota_off(sb, type);
5287}
5288
7c319d32
AK		 5289/*
5290 * quota_off function that is used when QUOTA feature is set.
5291 */
5292static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5293{
5294 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5295 return -EINVAL;
5296
5297 /* Disable only the limits. */
5298 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5299}
5300
ac27a0ec
DK		 5301/* Read data from quotafile - avoid pagecache and such because we cannot afford
5302 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5303 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5304 * we don't have to be afraid of races */
617ba13b 5305static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5306 size_t len, loff_t off)
5307{
5308 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5309 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5310 int err = 0;
5311 int offset = off & (sb->s_blocksize - 1);
5312 int tocopy;
5313 size_t toread;
5314 struct buffer_head *bh;
5315 loff_t i_size = i_size_read(inode);
5316
5317 if (off > i_size)
5318 return 0;
5319 if (off+len > i_size)
5320 len = i_size-off;
5321 toread = len;
5322 while (toread > 0) {
5323 tocopy = sb->s_blocksize - offset < toread ?
5324 sb->s_blocksize - offset : toread;
617ba13b 5325 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5326 if (err)
5327 return err;
5328 if (!bh) /* A hole? */
5329 memset(data, 0, tocopy);
5330 else
5331 memcpy(data, bh->b_data+offset, tocopy);
5332 brelse(bh);
5333 offset = 0;
5334 toread -= tocopy;
5335 data += tocopy;
5336 blk++;
5337 }
5338 return len;
5339}
5340
5341/* Write to quotafile (we know the transaction is already started and has
5342 * enough credits) */
617ba13b 5343static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5344 const char *data, size_t len, loff_t off)
5345{
5346 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5347 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5348 int err = 0;
5349 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5350 struct buffer_head *bh;
5351 handle_t *handle = journal_current_handle();
5352
0390131b 5353 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5354 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5355 " cancelled because transaction is not started",
9c3013e9
JK		 5356 (unsigned long long)off, (unsigned long long)len);
5357 return -EIO;
5358 }
67eeb568
DM		 5359 /*
5360 * Since we account only one data block in transaction credits,
5361 * then it is impossible to cross a block boundary.
5362 */
5363 if (sb->s_blocksize - offset < len) {
5364 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5365 " cancelled because not block aligned",
5366 (unsigned long long)off, (unsigned long long)len);
5367 return -EIO;
5368 }
5369
67eeb568
DM		 5370 bh = ext4_bread(handle, inode, blk, 1, &err);
5371 if (!bh)
5372 goto out;
62d2b5f2
JK		 5373 err = ext4_journal_get_write_access(handle, bh);
5374 if (err) {
5375 brelse(bh);
5376 goto out;
ac27a0ec 5377 }
67eeb568
DM		 5378 lock_buffer(bh);
5379 memcpy(bh->b_data+offset, data, len);
5380 flush_dcache_page(bh->b_page);
5381 unlock_buffer(bh);
62d2b5f2 5382 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5383 brelse(bh);
ac27a0ec 5384out:
0b7f7cef 5385 if (err)
ac27a0ec 5386 return err;
67eeb568
DM		 5387 if (inode->i_size < off + len) {
5388 i_size_write(inode, off + len);
617ba13b 5389 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5390 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5391 }
67eeb568 5392 return len;
ac27a0ec
DK		 5393}
5394
5395#endif
5396
152a0836
AV		 5397static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5398 const char *dev_name, void *data)
ac27a0ec 5399{
152a0836 5400 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5401}
5402
37f328eb 5403#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5404static inline void register_as_ext2(void)
5405{
5406 int err = register_filesystem(&ext2_fs_type);
5407 if (err)
5408 printk(KERN_WARNING
5409 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5410}
5411
5412static inline void unregister_as_ext2(void)
5413{
5414 unregister_filesystem(&ext2_fs_type);
5415}
2035e776
TT		 5416
5417static inline int ext2_feature_set_ok(struct super_block *sb)
5418{
5419 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5420 return 0;
5421 if (sb->s_flags & MS_RDONLY)
5422 return 1;
5423 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5424 return 0;
5425 return 1;
5426}
24b58424
TT		 5427#else
5428static inline void register_as_ext2(void) { }
5429static inline void unregister_as_ext2(void) { }
2035e776 5430static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5431#endif
5432
37f328eb 5433#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5434static inline void register_as_ext3(void)
5435{
5436 int err = register_filesystem(&ext3_fs_type);
5437 if (err)
5438 printk(KERN_WARNING
5439 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5440}
5441
5442static inline void unregister_as_ext3(void)
5443{
5444 unregister_filesystem(&ext3_fs_type);
5445}
2035e776
TT		 5446
5447static inline int ext3_feature_set_ok(struct super_block *sb)
5448{
5449 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5450 return 0;
5451 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5452 return 0;
5453 if (sb->s_flags & MS_RDONLY)
5454 return 1;
5455 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5456 return 0;
5457 return 1;
5458}
24b58424
TT		 5459#else
5460static inline void register_as_ext3(void) { }
5461static inline void unregister_as_ext3(void) { }
2035e776 5462static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5463#endif
5464
03010a33
TT		 5465static struct file_system_type ext4_fs_type = {
5466 .owner = THIS_MODULE,
5467 .name = "ext4",
152a0836 5468 .mount = ext4_mount,
03010a33
TT		 5469 .kill_sb = kill_block_super,
5470 .fs_flags = FS_REQUIRES_DEV,
5471};
7f78e035 5472MODULE_ALIAS_FS("ext4");
03010a33 5473
8f021222 5474static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5475{
5476 struct ext4_features *ef;
5477 int ret = -ENOMEM;
5478
5479 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5480 if (!ef)
5481 goto out;
5482
5483 ef->f_kobj.kset = ext4_kset;
5484 init_completion(&ef->f_kobj_unregister);
5485 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5486 "features");
5487 if (ret) {
5488 kfree(ef);
5489 goto out;
5490 }
5491
5492 ext4_feat = ef;
5493 ret = 0;
5494out:
5495 return ret;
5496}
5497
8f021222
LC		 5498static void ext4_exit_feat_adverts(void)
5499{
5500 kobject_put(&ext4_feat->f_kobj);
5501 wait_for_completion(&ext4_feat->f_kobj_unregister);
5502 kfree(ext4_feat);
5503}
5504
e9e3bcec
ES		 5505/* Shared across all ext4 file systems */
5506wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5507struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5508
5dabfc78 5509static int __init ext4_init_fs(void)
ac27a0ec 5510{
e9e3bcec 5511 int i, err;
c9de560d 5512
07c0c5d8
AV		 5513 ext4_li_info = NULL;
5514 mutex_init(&ext4_li_mtx);
5515
9a4c8019 5516 /* Build-time check for flags consistency */
12e9b892 5517 ext4_check_flag_values();
e9e3bcec
ES		 5518
5519 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5520 mutex_init(&ext4__aio_mutex[i]);
5521 init_waitqueue_head(&ext4__ioend_wq[i]);
5522 }
5523
51865fda 5524 err = ext4_init_es();
6fd058f7
TT		 5525 if (err)
5526 return err;
51865fda
ZL		 5527
5528 err = ext4_init_pageio();
5529 if (err)
5530 goto out7;
5531
5dabfc78 5532 err = ext4_init_system_zone();
bd2d0210 5533 if (err)
d44651d0 5534 goto out6;
3197ebdb 5535 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5536 if (!ext4_kset) {
5537 err = -ENOMEM;
dd68314c 5538 goto out5;
0e376b1e 5539 }
d44651d0 5540 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5541
5542 err = ext4_init_feat_adverts();
dd68314c
TT		 5543 if (err)
5544 goto out4;
857ac889 5545
5dabfc78 5546 err = ext4_init_mballoc();
c9de560d
AT		 5547 if (err)
5548 goto out2;
9c191f70
M		 5549 else
5550 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5551 err = init_inodecache();
5552 if (err)
5553 goto out1;
24b58424 5554 register_as_ext3();
2035e776 5555 register_as_ext2();
03010a33 5556 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5557 if (err)
5558 goto out;
bfff6873 5559
ac27a0ec
DK		 5560 return 0;
5561out:
24b58424
TT		 5562 unregister_as_ext2();
5563 unregister_as_ext3();
ac27a0ec
DK		 5564 destroy_inodecache();
5565out1:
9c191f70 5566 ext4_mballoc_ready = 0;
5dabfc78 5567 ext4_exit_mballoc();
9c191f70 5568out2:
8f021222 5569 ext4_exit_feat_adverts();
dd68314c 5570out4:
d44651d0
FJ		 5571 if (ext4_proc_root)
5572 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5573 kset_unregister(ext4_kset);
d44651d0 5574out5:
5dabfc78 5575 ext4_exit_system_zone();
d44651d0 5576out6:
5dabfc78 5577 ext4_exit_pageio();
51865fda
ZL		 5578out7:
5579 ext4_exit_es();
5580
ac27a0ec
DK		 5581 return err;
5582}
5583
5dabfc78 5584static void __exit ext4_exit_fs(void)
ac27a0ec 5585{
bfff6873 5586 ext4_destroy_lazyinit_thread();
24b58424
TT		 5587 unregister_as_ext2();
5588 unregister_as_ext3();
03010a33 5589 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5590 destroy_inodecache();
5dabfc78 5591 ext4_exit_mballoc();
8f021222 5592 ext4_exit_feat_adverts();
9f6200bb 5593 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5594 kset_unregister(ext4_kset);
5dabfc78
TT		 5595 ext4_exit_system_zone();
5596 ext4_exit_pageio();
dd12ed14 5597 ext4_exit_es();
ac27a0ec
DK		 5598}
5599
5600MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5601MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5602MODULE_LICENSE("GPL");
5dabfc78
TT		 5603module_init(ext4_init_fs)
5604module_exit(ext4_exit_fs)
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