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ext4: don't orphan or truncate the boot loader inode
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
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);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
27dd4385 85static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
7f78e035 95MODULE_ALIAS_FS("ext2");
fa7614dd 96MODULE_ALIAS("ext2");
2035e776
TT		 97#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98#else
99#define IS_EXT2_SB(sb) (0)
100#endif
101
102
ba69f9ab
JK		 103#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104static struct file_system_type ext3_fs_type = {
105 .owner = THIS_MODULE,
106 .name = "ext3",
152a0836 107 .mount = ext4_mount,
ba69f9ab
JK		 108 .kill_sb = kill_block_super,
109 .fs_flags = FS_REQUIRES_DEV,
110};
7f78e035 111MODULE_ALIAS_FS("ext3");
fa7614dd 112MODULE_ALIAS("ext3");
ba69f9ab
JK		 113#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114#else
115#define IS_EXT3_SB(sb) (0)
116#endif
bd81d8ee 117
d25425f8
DW		 118static int ext4_verify_csum_type(struct super_block *sb,
119 struct ext4_super_block *es)
120{
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 return 1;
124
125 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126}
127
a9c47317
DW		 128static __le32 ext4_superblock_csum(struct super_block *sb,
129 struct ext4_super_block *es)
130{
131 struct ext4_sb_info *sbi = EXT4_SB(sb);
132 int offset = offsetof(struct ext4_super_block, s_checksum);
133 __u32 csum;
134
135 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136
137 return cpu_to_le32(csum);
138}
139
c197855e
SH		 140static int ext4_superblock_csum_verify(struct super_block *sb,
141 struct ext4_super_block *es)
a9c47317
DW		 142{
143 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
144 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
145 return 1;
146
147 return es->s_checksum == ext4_superblock_csum(sb, es);
148}
149
06db49e6 150void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 151{
06db49e6
TT		 152 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
153
a9c47317
DW		 154 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
155 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
156 return;
157
158 es->s_checksum = ext4_superblock_csum(sb, es);
159}
160
9933fc0a
TT		 161void *ext4_kvmalloc(size_t size, gfp_t flags)
162{
163 void *ret;
164
8be04b93 165 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 166 if (!ret)
167 ret = __vmalloc(size, flags, PAGE_KERNEL);
168 return ret;
169}
170
171void *ext4_kvzalloc(size_t size, gfp_t flags)
172{
173 void *ret;
174
8be04b93 175 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 176 if (!ret)
177 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
178 return ret;
179}
180
181void ext4_kvfree(void *ptr)
182{
183 if (is_vmalloc_addr(ptr))
184 vfree(ptr);
185 else
186 kfree(ptr);
187
188}
189
8fadc143
AR		 190ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
191 struct ext4_group_desc *bg)
bd81d8ee 192{
3a14589c 193 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 194 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 195 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 196}
197
8fadc143
AR		 198ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
199 struct ext4_group_desc *bg)
bd81d8ee 200{
5272f837 201 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 202 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 203 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 204}
205
8fadc143
AR		 206ext4_fsblk_t ext4_inode_table(struct super_block *sb,
207 struct ext4_group_desc *bg)
bd81d8ee 208{
5272f837 209 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 210 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 211 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 212}
213
021b65bb
TT		 214__u32 ext4_free_group_clusters(struct super_block *sb,
215 struct ext4_group_desc *bg)
560671a0
AK		 216{
217 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
218 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 219 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 220}
221
222__u32 ext4_free_inodes_count(struct super_block *sb,
223 struct ext4_group_desc *bg)
224{
225 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
226 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 227 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 228}
229
230__u32 ext4_used_dirs_count(struct super_block *sb,
231 struct ext4_group_desc *bg)
232{
233 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
234 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 235 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 236}
237
238__u32 ext4_itable_unused_count(struct super_block *sb,
239 struct ext4_group_desc *bg)
240{
241 return le16_to_cpu(bg->bg_itable_unused_lo) |
242 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 243 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 244}
245
8fadc143
AR		 246void ext4_block_bitmap_set(struct super_block *sb,
247 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 248{
3a14589c 249 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 250 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
251 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 252}
253
8fadc143
AR		 254void ext4_inode_bitmap_set(struct super_block *sb,
255 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 256{
5272f837 257 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 258 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
259 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 260}
261
8fadc143
AR		 262void ext4_inode_table_set(struct super_block *sb,
263 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 264{
5272f837 265 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 266 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
267 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 268}
269
021b65bb
TT		 270void ext4_free_group_clusters_set(struct super_block *sb,
271 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 272{
273 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
274 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
275 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
276}
277
278void ext4_free_inodes_set(struct super_block *sb,
279 struct ext4_group_desc *bg, __u32 count)
280{
281 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
282 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
283 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
284}
285
286void ext4_used_dirs_set(struct super_block *sb,
287 struct ext4_group_desc *bg, __u32 count)
288{
289 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
290 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
291 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
292}
293
294void ext4_itable_unused_set(struct super_block *sb,
295 struct ext4_group_desc *bg, __u32 count)
296{
297 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
298 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
299 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
300}
301
d3d1faf6 302
1c13d5c0
TT		 303static void __save_error_info(struct super_block *sb, const char *func,
304 unsigned int line)
305{
306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307
308 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
309 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
310 es->s_last_error_time = cpu_to_le32(get_seconds());
311 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
312 es->s_last_error_line = cpu_to_le32(line);
313 if (!es->s_first_error_time) {
314 es->s_first_error_time = es->s_last_error_time;
315 strncpy(es->s_first_error_func, func,
316 sizeof(es->s_first_error_func));
317 es->s_first_error_line = cpu_to_le32(line);
318 es->s_first_error_ino = es->s_last_error_ino;
319 es->s_first_error_block = es->s_last_error_block;
320 }
66e61a9e
TT		 321 /*
322 * Start the daily error reporting function if it hasn't been
323 * started already
324 */
325 if (!es->s_error_count)
326 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 327 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 328}
329
330static void save_error_info(struct super_block *sb, const char *func,
331 unsigned int line)
332{
333 __save_error_info(sb, func, line);
334 ext4_commit_super(sb, 1);
335}
336
7c2e7087
TT		 337/*
338 * The del_gendisk() function uninitializes the disk-specific data
339 * structures, including the bdi structure, without telling anyone
340 * else. Once this happens, any attempt to call mark_buffer_dirty()
341 * (for example, by ext4_commit_super), will cause a kernel OOPS.
342 * This is a kludge to prevent these oops until we can put in a proper
343 * hook in del_gendisk() to inform the VFS and file system layers.
344 */
345static int block_device_ejected(struct super_block *sb)
346{
347 struct inode *bd_inode = sb->s_bdev->bd_inode;
348 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
349
350 return bdi->dev == NULL;
351}
352
18aadd47
BJ		 353static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
354{
355 struct super_block *sb = journal->j_private;
356 struct ext4_sb_info *sbi = EXT4_SB(sb);
357 int error = is_journal_aborted(journal);
5d3ee208 358 struct ext4_journal_cb_entry *jce;
18aadd47 359
5d3ee208 360 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 361 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 362 while (!list_empty(&txn->t_private_list)) {
363 jce = list_entry(txn->t_private_list.next,
364 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 365 list_del_init(&jce->jce_list);
366 spin_unlock(&sbi->s_md_lock);
367 jce->jce_func(sb, jce, error);
368 spin_lock(&sbi->s_md_lock);
369 }
370 spin_unlock(&sbi->s_md_lock);
371}
1c13d5c0 372
ac27a0ec
DK		 373/* Deal with the reporting of failure conditions on a filesystem such as
374 * inconsistencies detected or read IO failures.
375 *
376 * On ext2, we can store the error state of the filesystem in the
617ba13b 377 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 378 * write ordering constraints on the superblock which prevent us from
379 * writing it out straight away; and given that the journal is about to
380 * be aborted, we can't rely on the current, or future, transactions to
381 * write out the superblock safely.
382 *
dab291af 383 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 384 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 385 * that error until we've noted it down and cleared it.
386 */
387
617ba13b 388static void ext4_handle_error(struct super_block *sb)
ac27a0ec 389{
ac27a0ec
DK		 390 if (sb->s_flags & MS_RDONLY)
391 return;
392
2b2d6d01 393 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 394 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 395
4ab2f15b 396 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 397 if (journal)
dab291af 398 jbd2_journal_abort(journal, -EIO);
ac27a0ec 399 }
2b2d6d01 400 if (test_opt(sb, ERRORS_RO)) {
b31e1552 401 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 402 /*
403 * Make sure updated value of ->s_mount_flags will be visible
404 * before ->s_flags update
405 */
406 smp_wmb();
ac27a0ec
DK		 407 sb->s_flags |= MS_RDONLY;
408 }
ac27a0ec 409 if (test_opt(sb, ERRORS_PANIC))
617ba13b 410 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 411 sb->s_id);
412}
413
efbed4dc
TT		 414#define ext4_error_ratelimit(sb) \
415 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
416 "EXT4-fs error")
417
12062ddd 418void __ext4_error(struct super_block *sb, const char *function,
c398eda0 419 unsigned int line, const char *fmt, ...)
ac27a0ec 420{
0ff2ea7d 421 struct va_format vaf;
ac27a0ec
DK		 422 va_list args;
423
efbed4dc
TT		 424 if (ext4_error_ratelimit(sb)) {
425 va_start(args, fmt);
426 vaf.fmt = fmt;
427 vaf.va = &args;
428 printk(KERN_CRIT
429 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
430 sb->s_id, function, line, current->comm, &vaf);
431 va_end(args);
432 }
f3fc0210 433 save_error_info(sb, function, line);
617ba13b 434 ext4_handle_error(sb);
ac27a0ec
DK		 435}
436
e7c96e8e
JP		 437void __ext4_error_inode(struct inode *inode, const char *function,
438 unsigned int line, ext4_fsblk_t block,
439 const char *fmt, ...)
273df556
FM		 440{
441 va_list args;
f7c21177 442 struct va_format vaf;
1c13d5c0 443 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 444
1c13d5c0
TT		 445 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
446 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 447 if (ext4_error_ratelimit(inode->i_sb)) {
448 va_start(args, fmt);
449 vaf.fmt = fmt;
450 vaf.va = &args;
451 if (block)
452 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
453 "inode #%lu: block %llu: comm %s: %pV\n",
454 inode->i_sb->s_id, function, line, inode->i_ino,
455 block, current->comm, &vaf);
456 else
457 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
458 "inode #%lu: comm %s: %pV\n",
459 inode->i_sb->s_id, function, line, inode->i_ino,
460 current->comm, &vaf);
461 va_end(args);
462 }
1c13d5c0 463 save_error_info(inode->i_sb, function, line);
273df556
FM		 464 ext4_handle_error(inode->i_sb);
465}
466
e7c96e8e
JP		 467void __ext4_error_file(struct file *file, const char *function,
468 unsigned int line, ext4_fsblk_t block,
469 const char *fmt, ...)
273df556
FM		 470{
471 va_list args;
f7c21177 472 struct va_format vaf;
1c13d5c0 473 struct ext4_super_block *es;
496ad9aa 474 struct inode *inode = file_inode(file);
273df556
FM		 475 char pathname[80], *path;
476
1c13d5c0
TT		 477 es = EXT4_SB(inode->i_sb)->s_es;
478 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc
TT		 479 if (ext4_error_ratelimit(inode->i_sb)) {
480 path = d_path(&(file->f_path), pathname, sizeof(pathname));
481 if (IS_ERR(path))
482 path = "(unknown)";
483 va_start(args, fmt);
484 vaf.fmt = fmt;
485 vaf.va = &args;
486 if (block)
487 printk(KERN_CRIT
488 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
489 "block %llu: comm %s: path %s: %pV\n",
490 inode->i_sb->s_id, function, line, inode->i_ino,
491 block, current->comm, path, &vaf);
492 else
493 printk(KERN_CRIT
494 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
495 "comm %s: path %s: %pV\n",
496 inode->i_sb->s_id, function, line, inode->i_ino,
497 current->comm, path, &vaf);
498 va_end(args);
499 }
1c13d5c0 500 save_error_info(inode->i_sb, function, line);
273df556
FM		 501 ext4_handle_error(inode->i_sb);
502}
503
722887dd
TT		 504const char *ext4_decode_error(struct super_block *sb, int errno,
505 char nbuf[16])
ac27a0ec
DK		 506{
507 char *errstr = NULL;
508
509 switch (errno) {
510 case -EIO:
511 errstr = "IO failure";
512 break;
513 case -ENOMEM:
514 errstr = "Out of memory";
515 break;
516 case -EROFS:
78f1ddbb
TT		 517 if (!sb || (EXT4_SB(sb)->s_journal &&
518 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 519 errstr = "Journal has aborted";
520 else
521 errstr = "Readonly filesystem";
522 break;
523 default:
524 /* If the caller passed in an extra buffer for unknown
525 * errors, textualise them now. Else we just return
526 * NULL. */
527 if (nbuf) {
528 /* Check for truncated error codes... */
529 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
530 errstr = nbuf;
531 }
532 break;
533 }
534
535 return errstr;
536}
537
617ba13b 538/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 539 * automatically and invokes the appropriate error response. */
540
c398eda0
TT		 541void __ext4_std_error(struct super_block *sb, const char *function,
542 unsigned int line, int errno)
ac27a0ec
DK		 543{
544 char nbuf[16];
545 const char *errstr;
546
547 /* Special case: if the error is EROFS, and we're not already
548 * inside a transaction, then there's really no point in logging
549 * an error. */
550 if (errno == -EROFS && journal_current_handle() == NULL &&
551 (sb->s_flags & MS_RDONLY))
552 return;
553
efbed4dc
TT		 554 if (ext4_error_ratelimit(sb)) {
555 errstr = ext4_decode_error(sb, errno, nbuf);
556 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
557 sb->s_id, function, line, errstr);
558 }
ac27a0ec 559
efbed4dc 560 save_error_info(sb, function, line);
617ba13b 561 ext4_handle_error(sb);
ac27a0ec
DK		 562}
563
564/*
617ba13b 565 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 566 * abort function may be used to deal with unrecoverable failures such
567 * as journal IO errors or ENOMEM at a critical moment in log management.
568 *
569 * We unconditionally force the filesystem into an ABORT|READONLY state,
570 * unless the error response on the fs has been set to panic in which
571 * case we take the easy way out and panic immediately.
572 */
573
c67d859e 574void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 575 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 576{
577 va_list args;
578
1c13d5c0 579 save_error_info(sb, function, line);
ac27a0ec 580 va_start(args, fmt);
c398eda0
TT		 581 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
582 function, line);
ac27a0ec
DK		 583 vprintk(fmt, args);
584 printk("\n");
585 va_end(args);
586
1c13d5c0
TT		 587 if ((sb->s_flags & MS_RDONLY) == 0) {
588 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 589 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 590 /*
591 * Make sure updated value of ->s_mount_flags will be visible
592 * before ->s_flags update
593 */
594 smp_wmb();
595 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 596 if (EXT4_SB(sb)->s_journal)
597 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
598 save_error_info(sb, function, line);
599 }
ac27a0ec 600 if (test_opt(sb, ERRORS_PANIC))
617ba13b 601 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 602}
603
e7c96e8e
JP		 604void __ext4_msg(struct super_block *sb,
605 const char *prefix, const char *fmt, ...)
b31e1552 606{
0ff2ea7d 607 struct va_format vaf;
b31e1552
ES		 608 va_list args;
609
efbed4dc
TT		 610 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
611 return;
612
b31e1552 613 va_start(args, fmt);
0ff2ea7d
JP		 614 vaf.fmt = fmt;
615 vaf.va = &args;
616 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 617 va_end(args);
618}
619
12062ddd 620void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 621 unsigned int line, const char *fmt, ...)
ac27a0ec 622{
0ff2ea7d 623 struct va_format vaf;
ac27a0ec
DK		 624 va_list args;
625
efbed4dc
TT		 626 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
627 "EXT4-fs warning"))
628 return;
629
ac27a0ec 630 va_start(args, fmt);
0ff2ea7d
JP		 631 vaf.fmt = fmt;
632 vaf.va = &args;
633 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
634 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 635 va_end(args);
636}
637
e29136f8
TT		 638void __ext4_grp_locked_error(const char *function, unsigned int line,
639 struct super_block *sb, ext4_group_t grp,
640 unsigned long ino, ext4_fsblk_t block,
641 const char *fmt, ...)
5d1b1b3f
AK		 642__releases(bitlock)
643__acquires(bitlock)
644{
0ff2ea7d 645 struct va_format vaf;
5d1b1b3f
AK		 646 va_list args;
647 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
648
1c13d5c0
TT		 649 es->s_last_error_ino = cpu_to_le32(ino);
650 es->s_last_error_block = cpu_to_le64(block);
651 __save_error_info(sb, function, line);
0ff2ea7d 652
efbed4dc
TT		 653 if (ext4_error_ratelimit(sb)) {
654 va_start(args, fmt);
655 vaf.fmt = fmt;
656 vaf.va = &args;
657 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
658 sb->s_id, function, line, grp);
659 if (ino)
660 printk(KERN_CONT "inode %lu: ", ino);
661 if (block)
662 printk(KERN_CONT "block %llu:",
663 (unsigned long long) block);
664 printk(KERN_CONT "%pV\n", &vaf);
665 va_end(args);
666 }
5d1b1b3f
AK		 667
668 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 669 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 670 return;
671 }
1c13d5c0 672
5d1b1b3f
AK		 673 ext4_unlock_group(sb, grp);
674 ext4_handle_error(sb);
675 /*
676 * We only get here in the ERRORS_RO case; relocking the group
677 * may be dangerous, but nothing bad will happen since the
678 * filesystem will have already been marked read/only and the
679 * journal has been aborted. We return 1 as a hint to callers
680 * who might what to use the return value from
25985edc 681 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 682 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
683 * aggressively from the ext4 function in question, with a
684 * more appropriate error code.
685 */
686 ext4_lock_group(sb, grp);
687 return;
688}
689
617ba13b 690void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 691{
617ba13b 692 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 693
617ba13b 694 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 695 return;
696
12062ddd 697 ext4_warning(sb,
ac27a0ec
DK		 698 "updating to rev %d because of new feature flag, "
699 "running e2fsck is recommended",
617ba13b 700 EXT4_DYNAMIC_REV);
ac27a0ec 701
617ba13b
MC		 702 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
703 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
704 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 705 /* leave es->s_feature_*compat flags alone */
706 /* es->s_uuid will be set by e2fsck if empty */
707
708 /*
709 * The rest of the superblock fields should be zero, and if not it
710 * means they are likely already in use, so leave them alone. We
711 * can leave it up to e2fsck to clean up any inconsistencies there.
712 */
713}
714
715/*
716 * Open the external journal device
717 */
b31e1552 718static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 719{
720 struct block_device *bdev;
721 char b[BDEVNAME_SIZE];
722
d4d77629 723 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 724 if (IS_ERR(bdev))
725 goto fail;
726 return bdev;
727
728fail:
b31e1552 729 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 730 __bdevname(dev, b), PTR_ERR(bdev));
731 return NULL;
732}
733
734/*
735 * Release the journal device
736 */
4385bab1 737static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 738{
4385bab1 739 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 740}
741
4385bab1 742static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 743{
744 struct block_device *bdev;
ac27a0ec
DK		 745 bdev = sbi->journal_bdev;
746 if (bdev) {
4385bab1 747 ext4_blkdev_put(bdev);
ac27a0ec
DK		 748 sbi->journal_bdev = NULL;
749 }
ac27a0ec
DK		 750}
751
752static inline struct inode *orphan_list_entry(struct list_head *l)
753{
617ba13b 754 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 755}
756
617ba13b 757static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 758{
759 struct list_head *l;
760
b31e1552
ES		 761 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
762 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 763
764 printk(KERN_ERR "sb_info orphan list:\n");
765 list_for_each(l, &sbi->s_orphan) {
766 struct inode *inode = orphan_list_entry(l);
767 printk(KERN_ERR " "
768 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
769 inode->i_sb->s_id, inode->i_ino, inode,
770 inode->i_mode, inode->i_nlink,
771 NEXT_ORPHAN(inode));
772 }
773}
774
2b2d6d01 775static void ext4_put_super(struct super_block *sb)
ac27a0ec 776{
617ba13b
MC		 777 struct ext4_sb_info *sbi = EXT4_SB(sb);
778 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 779 int i, err;
ac27a0ec 780
857ac889 781 ext4_unregister_li_request(sb);
e0ccfd95
CH		 782 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
783
2e8fa54e 784 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 785 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 786
0390131b
FM		 787 if (sbi->s_journal) {
788 err = jbd2_journal_destroy(sbi->s_journal);
789 sbi->s_journal = NULL;
790 if (err < 0)
c67d859e 791 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 792 }
d4edac31 793
d3922a77 794 ext4_es_unregister_shrinker(sbi);
9105bb14 795 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 796 ext4_release_system_zone(sb);
797 ext4_mb_release(sb);
798 ext4_ext_release(sb);
799 ext4_xattr_put_super(sb);
800
ac27a0ec 801 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 802 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 803 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 804 }
58c5873a 805 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 806 ext4_commit_super(sb, 1);
807
240799cd 808 if (sbi->s_proc) {
66acdcf4 809 remove_proc_entry("options", sbi->s_proc);
9f6200bb 810 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 811 }
3197ebdb 812 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 813
814 for (i = 0; i < sbi->s_gdb_count; i++)
815 brelse(sbi->s_group_desc[i]);
f18a5f21 816 ext4_kvfree(sbi->s_group_desc);
9933fc0a 817 ext4_kvfree(sbi->s_flex_groups);
57042651 818 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 819 percpu_counter_destroy(&sbi->s_freeinodes_counter);
820 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 821 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 822 brelse(sbi->s_sbh);
823#ifdef CONFIG_QUOTA
a2d4a646 824 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 825 kfree(sbi->s_qf_names[i]);
826#endif
827
828 /* Debugging code just in case the in-memory inode orphan list
829 * isn't empty. The on-disk one can be non-empty if we've
830 * detected an error and taken the fs readonly, but the
831 * in-memory list had better be clean by this point. */
832 if (!list_empty(&sbi->s_orphan))
833 dump_orphan_list(sb, sbi);
834 J_ASSERT(list_empty(&sbi->s_orphan));
835
f98393a6 836 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 837 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
838 /*
839 * Invalidate the journal device's buffers. We don't want them
840 * floating about in memory - the physical journal device may
841 * hotswapped, and it breaks the `ro-after' testing code.
842 */
843 sync_blockdev(sbi->journal_bdev);
f98393a6 844 invalidate_bdev(sbi->journal_bdev);
617ba13b 845 ext4_blkdev_remove(sbi);
ac27a0ec 846 }
9c191f70
M		 847 if (sbi->s_mb_cache) {
848 ext4_xattr_destroy_cache(sbi->s_mb_cache);
849 sbi->s_mb_cache = NULL;
850 }
c5e06d10
JL		 851 if (sbi->s_mmp_tsk)
852 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 853 sb->s_fs_info = NULL;
3197ebdb
TT		 854 /*
855 * Now that we are completely done shutting down the
856 * superblock, we need to actually destroy the kobject.
857 */
3197ebdb
TT		 858 kobject_put(&sbi->s_kobj);
859 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 860 if (sbi->s_chksum_driver)
861 crypto_free_shash(sbi->s_chksum_driver);
705895b6 862 kfree(sbi->s_blockgroup_lock);
ac27a0ec 863 kfree(sbi);
ac27a0ec
DK		 864}
865
e18b890b 866static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 867
868/*
869 * Called inside transaction, so use GFP_NOFS
870 */
617ba13b 871static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 872{
617ba13b 873 struct ext4_inode_info *ei;
ac27a0ec 874
e6b4f8da 875 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 876 if (!ei)
877 return NULL;
0b8e58a1 878
ac27a0ec 879 ei->vfs_inode.i_version = 1;
202ee5df 880 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 881 INIT_LIST_HEAD(&ei->i_prealloc_list);
882 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 883 ext4_es_init_tree(&ei->i_es_tree);
884 rwlock_init(&ei->i_es_lock);
74cd15cd 885 INIT_LIST_HEAD(&ei->i_es_lru);
eb68d0e2 886 ei->i_es_all_nr = 0;
74cd15cd 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
39655164 1126static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1127 .fh_to_dentry = ext4_fh_to_dentry,
1128 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1129 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1130};
1131
1132enum {
1133 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1134 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1135 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1136 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1137 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1138 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1139 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1140 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1141 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1142 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1143 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1144 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1145 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1146 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1147 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1148 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1149 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1150 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1151 Opt_max_dir_size_kb,
ac27a0ec
DK		 1152};
1153
a447c093 1154static const match_table_t tokens = {
ac27a0ec
DK		 1155 {Opt_bsd_df, "bsddf"},
1156 {Opt_minix_df, "minixdf"},
1157 {Opt_grpid, "grpid"},
1158 {Opt_grpid, "bsdgroups"},
1159 {Opt_nogrpid, "nogrpid"},
1160 {Opt_nogrpid, "sysvgroups"},
1161 {Opt_resgid, "resgid=%u"},
1162 {Opt_resuid, "resuid=%u"},
1163 {Opt_sb, "sb=%u"},
1164 {Opt_err_cont, "errors=continue"},
1165 {Opt_err_panic, "errors=panic"},
1166 {Opt_err_ro, "errors=remount-ro"},
1167 {Opt_nouid32, "nouid32"},
ac27a0ec 1168 {Opt_debug, "debug"},
72578c33
TT		 1169 {Opt_removed, "oldalloc"},
1170 {Opt_removed, "orlov"},
ac27a0ec
DK		 1171 {Opt_user_xattr, "user_xattr"},
1172 {Opt_nouser_xattr, "nouser_xattr"},
1173 {Opt_acl, "acl"},
1174 {Opt_noacl, "noacl"},
e3bb52ae 1175 {Opt_noload, "norecovery"},
5a916be1 1176 {Opt_noload, "noload"},
72578c33
TT		 1177 {Opt_removed, "nobh"},
1178 {Opt_removed, "bh"},
ac27a0ec 1179 {Opt_commit, "commit=%u"},
30773840
TT		 1180 {Opt_min_batch_time, "min_batch_time=%u"},
1181 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1182 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1183 {Opt_journal_path, "journal_path=%s"},
818d276c
GS		 1184 {Opt_journal_checksum, "journal_checksum"},
1185 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1186 {Opt_abort, "abort"},
1187 {Opt_data_journal, "data=journal"},
1188 {Opt_data_ordered, "data=ordered"},
1189 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1190 {Opt_data_err_abort, "data_err=abort"},
1191 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1192 {Opt_offusrjquota, "usrjquota="},
1193 {Opt_usrjquota, "usrjquota=%s"},
1194 {Opt_offgrpjquota, "grpjquota="},
1195 {Opt_grpjquota, "grpjquota=%s"},
1196 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1197 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1198 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1199 {Opt_grpquota, "grpquota"},
1200 {Opt_noquota, "noquota"},
1201 {Opt_quota, "quota"},
1202 {Opt_usrquota, "usrquota"},
1203 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1204 {Opt_barrier, "barrier"},
1205 {Opt_nobarrier, "nobarrier"},
25ec56b5 1206 {Opt_i_version, "i_version"},
c9de560d 1207 {Opt_stripe, "stripe=%u"},
64769240 1208 {Opt_delalloc, "delalloc"},
dd919b98 1209 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1210 {Opt_removed, "mblk_io_submit"},
1211 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1212 {Opt_block_validity, "block_validity"},
1213 {Opt_noblock_validity, "noblock_validity"},
240799cd 1214 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1215 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1216 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1217 {Opt_auto_da_alloc, "auto_da_alloc"},
1218 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1219 {Opt_dioread_nolock, "dioread_nolock"},
1220 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1221 {Opt_discard, "discard"},
1222 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1223 {Opt_init_itable, "init_itable=%u"},
1224 {Opt_init_itable, "init_itable"},
1225 {Opt_noinit_itable, "noinit_itable"},
df981d03 1226 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1227 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1228 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1229 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1230 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1231 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1232 {Opt_err, NULL},
ac27a0ec
DK		 1233};
1234
617ba13b 1235static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1236{
617ba13b 1237 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1238 char *options = (char *) *data;
1239
1240 if (!options || strncmp(options, "sb=", 3) != 0)
1241 return 1; /* Default location */
0b8e58a1 1242
ac27a0ec 1243 options += 3;
0b8e58a1 1244 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1245 sb_block = simple_strtoul(options, &options, 0);
1246 if (*options && *options != ',') {
4776004f 1247 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1248 (char *) *data);
1249 return 1;
1250 }
1251 if (*options == ',')
1252 options++;
1253 *data = (void *) options;
0b8e58a1 1254
ac27a0ec
DK		 1255 return sb_block;
1256}
1257
b3881f74 1258#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1259static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1260 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1261
56c50f11
DM		 1262#ifdef CONFIG_QUOTA
1263static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1264{
1265 struct ext4_sb_info *sbi = EXT4_SB(sb);
1266 char *qname;
03dafb5f 1267 int ret = -1;
56c50f11
DM		 1268
1269 if (sb_any_quota_loaded(sb) &&
1270 !sbi->s_qf_names[qtype]) {
1271 ext4_msg(sb, KERN_ERR,
1272 "Cannot change journaled "
1273 "quota options when quota turned on");
57f73c2c 1274 return -1;
56c50f11 1275 }
262b4662
JK		 1276 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1277 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1278 "when QUOTA feature is enabled");
1279 return -1;
1280 }
56c50f11
DM		 1281 qname = match_strdup(args);
1282 if (!qname) {
1283 ext4_msg(sb, KERN_ERR,
1284 "Not enough memory for storing quotafile name");
57f73c2c 1285 return -1;
56c50f11 1286 }
03dafb5f
CG		 1287 if (sbi->s_qf_names[qtype]) {
1288 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1289 ret = 1;
1290 else
1291 ext4_msg(sb, KERN_ERR,
1292 "%s quota file already specified",
1293 QTYPE2NAME(qtype));
1294 goto errout;
56c50f11 1295 }
03dafb5f 1296 if (strchr(qname, '/')) {
56c50f11
DM		 1297 ext4_msg(sb, KERN_ERR,
1298 "quotafile must be on filesystem root");
03dafb5f 1299 goto errout;
56c50f11 1300 }
03dafb5f 1301 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1302 set_opt(sb, QUOTA);
56c50f11 1303 return 1;
03dafb5f
CG		 1304errout:
1305 kfree(qname);
1306 return ret;
56c50f11
DM		 1307}
1308
1309static int clear_qf_name(struct super_block *sb, int qtype)
1310{
1311
1312 struct ext4_sb_info *sbi = EXT4_SB(sb);
1313
1314 if (sb_any_quota_loaded(sb) &&
1315 sbi->s_qf_names[qtype]) {
1316 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1317 " when quota turned on");
57f73c2c 1318 return -1;
56c50f11 1319 }
03dafb5f 1320 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1321 sbi->s_qf_names[qtype] = NULL;
1322 return 1;
1323}
1324#endif
1325
26092bf5
TT		 1326#define MOPT_SET 0x0001
1327#define MOPT_CLEAR 0x0002
1328#define MOPT_NOSUPPORT 0x0004
1329#define MOPT_EXPLICIT 0x0008
1330#define MOPT_CLEAR_ERR 0x0010
1331#define MOPT_GTE0 0x0020
ac27a0ec 1332#ifdef CONFIG_QUOTA
26092bf5
TT		 1333#define MOPT_Q 0
1334#define MOPT_QFMT 0x0040
1335#else
1336#define MOPT_Q MOPT_NOSUPPORT
1337#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1338#endif
26092bf5 1339#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1340#define MOPT_NO_EXT2 0x0100
1341#define MOPT_NO_EXT3 0x0200
1342#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1343#define MOPT_STRING 0x0400
26092bf5
TT		 1344
1345static const struct mount_opts {
1346 int token;
1347 int mount_opt;
1348 int flags;
1349} ext4_mount_opts[] = {
1350 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1351 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1352 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1353 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1354 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1355 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1356 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1357 MOPT_EXT4_ONLY | MOPT_SET},
1358 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1359 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1360 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1361 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1362 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1363 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1364 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1365 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1366 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1367 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1368 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1369 EXT4_MOUNT_JOURNAL_CHECKSUM),
1370 MOPT_EXT4_ONLY | MOPT_SET},
1371 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1372 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1373 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1374 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1375 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1376 MOPT_NO_EXT2 | MOPT_SET},
1377 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1378 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1379 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1380 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1381 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1382 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1383 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1384 {Opt_commit, 0, MOPT_GTE0},
1385 {Opt_max_batch_time, 0, MOPT_GTE0},
1386 {Opt_min_batch_time, 0, MOPT_GTE0},
1387 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1388 {Opt_init_itable, 0, MOPT_GTE0},
1389 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1390 {Opt_resuid, 0, MOPT_GTE0},
1391 {Opt_resgid, 0, MOPT_GTE0},
1392 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1393 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1394 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1395 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1396 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1397 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1398 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1399 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1400 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1401#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1402 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1403 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1404#else
26092bf5
TT		 1405 {Opt_acl, 0, MOPT_NOSUPPORT},
1406 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1407#endif
26092bf5
TT		 1408 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1409 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1410 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1411 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1412 MOPT_SET | MOPT_Q},
1413 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1414 MOPT_SET | MOPT_Q},
1415 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1416 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1417 {Opt_usrjquota, 0, MOPT_Q},
1418 {Opt_grpjquota, 0, MOPT_Q},
1419 {Opt_offusrjquota, 0, MOPT_Q},
1420 {Opt_offgrpjquota, 0, MOPT_Q},
1421 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1422 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1423 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1424 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1425 {Opt_err, 0, 0}
1426};
1427
1428static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1429 substring_t *args, unsigned long *journal_devnum,
1430 unsigned int *journal_ioprio, int is_remount)
1431{
1432 struct ext4_sb_info *sbi = EXT4_SB(sb);
1433 const struct mount_opts *m;
08cefc7a
EB		 1434 kuid_t uid;
1435 kgid_t gid;
26092bf5
TT		 1436 int arg = 0;
1437
57f73c2c
TT		 1438#ifdef CONFIG_QUOTA
1439 if (token == Opt_usrjquota)
1440 return set_qf_name(sb, USRQUOTA, &args[0]);
1441 else if (token == Opt_grpjquota)
1442 return set_qf_name(sb, GRPQUOTA, &args[0]);
1443 else if (token == Opt_offusrjquota)
1444 return clear_qf_name(sb, USRQUOTA);
1445 else if (token == Opt_offgrpjquota)
1446 return clear_qf_name(sb, GRPQUOTA);
1447#endif
26092bf5 1448 switch (token) {
f7048605
TT		 1449 case Opt_noacl:
1450 case Opt_nouser_xattr:
1451 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1452 break;
26092bf5
TT		 1453 case Opt_sb:
1454 return 1; /* handled by get_sb_block() */
1455 case Opt_removed:
5f3633e3 1456 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1457 return 1;
26092bf5
TT		 1458 case Opt_abort:
1459 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1460 return 1;
1461 case Opt_i_version:
1462 sb->s_flags |= MS_I_VERSION;
1463 return 1;
26092bf5
TT		 1464 }
1465
5f3633e3
JK		 1466 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1467 if (token == m->token)
1468 break;
1469
1470 if (m->token == Opt_err) {
1471 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1472 "or missing value", opt);
1473 return -1;
1474 }
1475
8dc0aa8c
TT		 1476 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1477 ext4_msg(sb, KERN_ERR,
1478 "Mount option \"%s\" incompatible with ext2", opt);
1479 return -1;
1480 }
1481 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1482 ext4_msg(sb, KERN_ERR,
1483 "Mount option \"%s\" incompatible with ext3", opt);
1484 return -1;
1485 }
1486
ad4eec61 1487 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1488 return -1;
1489 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1490 return -1;
1491 if (m->flags & MOPT_EXPLICIT)
1492 set_opt2(sb, EXPLICIT_DELALLOC);
1493 if (m->flags & MOPT_CLEAR_ERR)
1494 clear_opt(sb, ERRORS_MASK);
1495 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1496 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1497 "options when quota turned on");
1498 return -1;
1499 }
1500
1501 if (m->flags & MOPT_NOSUPPORT) {
1502 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1503 } else if (token == Opt_commit) {
1504 if (arg == 0)
1505 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1506 sbi->s_commit_interval = HZ * arg;
1507 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1508 sbi->s_max_batch_time = arg;
1509 } else if (token == Opt_min_batch_time) {
1510 sbi->s_min_batch_time = arg;
1511 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1512 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1513 ext4_msg(sb, KERN_ERR,
1514 "EXT4-fs: inode_readahead_blks must be "
1515 "0 or a power of 2 smaller than 2^31");
26092bf5 1516 return -1;
5f3633e3
JK		 1517 }
1518 sbi->s_inode_readahead_blks = arg;
1519 } else if (token == Opt_init_itable) {
1520 set_opt(sb, INIT_INODE_TABLE);
1521 if (!args->from)
1522 arg = EXT4_DEF_LI_WAIT_MULT;
1523 sbi->s_li_wait_mult = arg;
1524 } else if (token == Opt_max_dir_size_kb) {
1525 sbi->s_max_dir_size_kb = arg;
1526 } else if (token == Opt_stripe) {
1527 sbi->s_stripe = arg;
1528 } else if (token == Opt_resuid) {
1529 uid = make_kuid(current_user_ns(), arg);
1530 if (!uid_valid(uid)) {
1531 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1532 return -1;
1533 }
5f3633e3
JK		 1534 sbi->s_resuid = uid;
1535 } else if (token == Opt_resgid) {
1536 gid = make_kgid(current_user_ns(), arg);
1537 if (!gid_valid(gid)) {
1538 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1539 return -1;
1540 }
1541 sbi->s_resgid = gid;
1542 } else if (token == Opt_journal_dev) {
1543 if (is_remount) {
1544 ext4_msg(sb, KERN_ERR,
1545 "Cannot specify journal on remount");
1546 return -1;
1547 }
1548 *journal_devnum = arg;
ad4eec61
ES		 1549 } else if (token == Opt_journal_path) {
1550 char *journal_path;
1551 struct inode *journal_inode;
1552 struct path path;
1553 int error;
1554
1555 if (is_remount) {
1556 ext4_msg(sb, KERN_ERR,
1557 "Cannot specify journal on remount");
1558 return -1;
1559 }
1560 journal_path = match_strdup(&args[0]);
1561 if (!journal_path) {
1562 ext4_msg(sb, KERN_ERR, "error: could not dup "
1563 "journal device string");
1564 return -1;
1565 }
1566
1567 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1568 if (error) {
1569 ext4_msg(sb, KERN_ERR, "error: could not find "
1570 "journal device path: error %d", error);
1571 kfree(journal_path);
1572 return -1;
1573 }
1574
1575 journal_inode = path.dentry->d_inode;
1576 if (!S_ISBLK(journal_inode->i_mode)) {
1577 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1578 "is not a block device", journal_path);
1579 path_put(&path);
1580 kfree(journal_path);
1581 return -1;
1582 }
1583
1584 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1585 path_put(&path);
1586 kfree(journal_path);
5f3633e3
JK		 1587 } else if (token == Opt_journal_ioprio) {
1588 if (arg > 7) {
1589 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1590 " (must be 0-7)");
1591 return -1;
1592 }
1593 *journal_ioprio =
1594 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1595 } else if (m->flags & MOPT_DATAJ) {
1596 if (is_remount) {
1597 if (!sbi->s_journal)
1598 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1599 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1600 ext4_msg(sb, KERN_ERR,
26092bf5 1601 "Cannot change data mode on remount");
26092bf5 1602 return -1;
ac27a0ec 1603 }
26092bf5 1604 } else {
5f3633e3
JK		 1605 clear_opt(sb, DATA_FLAGS);
1606 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1607 }
5f3633e3
JK		 1608#ifdef CONFIG_QUOTA
1609 } else if (m->flags & MOPT_QFMT) {
1610 if (sb_any_quota_loaded(sb) &&
1611 sbi->s_jquota_fmt != m->mount_opt) {
1612 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1613 "quota options when quota turned on");
1614 return -1;
1615 }
262b4662
JK		 1616 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1617 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1618 ext4_msg(sb, KERN_ERR,
1619 "Cannot set journaled quota options "
1620 "when QUOTA feature is enabled");
1621 return -1;
1622 }
5f3633e3
JK		 1623 sbi->s_jquota_fmt = m->mount_opt;
1624#endif
1625 } else {
1626 if (!args->from)
1627 arg = 1;
1628 if (m->flags & MOPT_CLEAR)
1629 arg = !arg;
1630 else if (unlikely(!(m->flags & MOPT_SET))) {
1631 ext4_msg(sb, KERN_WARNING,
1632 "buggy handling of option %s", opt);
1633 WARN_ON(1);
1634 return -1;
1635 }
1636 if (arg != 0)
1637 sbi->s_mount_opt |= m->mount_opt;
1638 else
1639 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1640 }
5f3633e3 1641 return 1;
26092bf5
TT		 1642}
1643
1644static int parse_options(char *options, struct super_block *sb,
1645 unsigned long *journal_devnum,
1646 unsigned int *journal_ioprio,
1647 int is_remount)
1648{
1649 struct ext4_sb_info *sbi = EXT4_SB(sb);
1650 char *p;
1651 substring_t args[MAX_OPT_ARGS];
1652 int token;
1653
1654 if (!options)
1655 return 1;
1656
1657 while ((p = strsep(&options, ",")) != NULL) {
1658 if (!*p)
1659 continue;
1660 /*
1661 * Initialize args struct so we know whether arg was
1662 * found; some options take optional arguments.
1663 */
caecd0af 1664 args[0].to = args[0].from = NULL;
26092bf5
TT		 1665 token = match_token(p, tokens, args);
1666 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1667 journal_ioprio, is_remount) < 0)
1668 return 0;
ac27a0ec
DK		 1669 }
1670#ifdef CONFIG_QUOTA
262b4662
JK		 1671 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1672 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1673 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1674 "feature is enabled");
1675 return 0;
1676 }
ac27a0ec 1677 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1678 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1679 clear_opt(sb, USRQUOTA);
ac27a0ec 1680
482a7425 1681 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1682 clear_opt(sb, GRPQUOTA);
ac27a0ec 1683
56c50f11 1684 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1685 ext4_msg(sb, KERN_ERR, "old and new quota "
1686 "format mixing");
ac27a0ec
DK		 1687 return 0;
1688 }
1689
1690 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1691 ext4_msg(sb, KERN_ERR, "journaled quota format "
1692 "not specified");
ac27a0ec
DK		 1693 return 0;
1694 }
ac27a0ec
DK		 1695 }
1696#endif
261cb20c
JK		 1697 if (test_opt(sb, DIOREAD_NOLOCK)) {
1698 int blocksize =
1699 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1700
1701 if (blocksize < PAGE_CACHE_SIZE) {
1702 ext4_msg(sb, KERN_ERR, "can't mount with "
1703 "dioread_nolock if block size != PAGE_SIZE");
1704 return 0;
1705 }
1706 }
ac27a0ec
DK		 1707 return 1;
1708}
1709
2adf6da8
TT		 1710static inline void ext4_show_quota_options(struct seq_file *seq,
1711 struct super_block *sb)
1712{
1713#if defined(CONFIG_QUOTA)
1714 struct ext4_sb_info *sbi = EXT4_SB(sb);
1715
1716 if (sbi->s_jquota_fmt) {
1717 char *fmtname = "";
1718
1719 switch (sbi->s_jquota_fmt) {
1720 case QFMT_VFS_OLD:
1721 fmtname = "vfsold";
1722 break;
1723 case QFMT_VFS_V0:
1724 fmtname = "vfsv0";
1725 break;
1726 case QFMT_VFS_V1:
1727 fmtname = "vfsv1";
1728 break;
1729 }
1730 seq_printf(seq, ",jqfmt=%s", fmtname);
1731 }
1732
1733 if (sbi->s_qf_names[USRQUOTA])
1734 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1735
1736 if (sbi->s_qf_names[GRPQUOTA])
1737 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1738#endif
1739}
1740
5a916be1
TT		 1741static const char *token2str(int token)
1742{
50df9fd5 1743 const struct match_token *t;
5a916be1
TT		 1744
1745 for (t = tokens; t->token != Opt_err; t++)
1746 if (t->token == token && !strchr(t->pattern, '='))
1747 break;
1748 return t->pattern;
1749}
1750
2adf6da8
TT		 1751/*
1752 * Show an option if
1753 * - it's set to a non-default value OR
1754 * - if the per-sb default is different from the global default
1755 */
66acdcf4
TT		 1756static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1757 int nodefs)
2adf6da8 1758{
2adf6da8
TT		 1759 struct ext4_sb_info *sbi = EXT4_SB(sb);
1760 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1761 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1762 const struct mount_opts *m;
66acdcf4 1763 char sep = nodefs ? '\n' : ',';
2adf6da8 1764
66acdcf4
TT		 1765#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1766#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1767
1768 if (sbi->s_sb_block != 1)
5a916be1
TT		 1769 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1770
1771 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1772 int want_set = m->flags & MOPT_SET;
1773 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1774 (m->flags & MOPT_CLEAR_ERR))
1775 continue;
66acdcf4 1776 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1777 continue; /* skip if same as the default */
1778 if ((want_set &&
1779 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1780 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1781 continue; /* select Opt_noFoo vs Opt_Foo */
1782 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1783 }
5a916be1 1784
08cefc7a 1785 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1786 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1787 SEQ_OPTS_PRINT("resuid=%u",
1788 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1789 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1790 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1791 SEQ_OPTS_PRINT("resgid=%u",
1792 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1793 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1794 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1795 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1796 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1797 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1798 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1799 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1800 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1801 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1802 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1803 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1804 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1805 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1806 if (sb->s_flags & MS_I_VERSION)
5a916be1 1807 SEQ_OPTS_PUTS("i_version");
66acdcf4 1808 if (nodefs || sbi->s_stripe)
5a916be1 1809 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1810 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1811 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1812 SEQ_OPTS_PUTS("data=journal");
1813 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1814 SEQ_OPTS_PUTS("data=ordered");
1815 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1816 SEQ_OPTS_PUTS("data=writeback");
1817 }
66acdcf4
TT		 1818 if (nodefs ||
1819 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1820 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1821 sbi->s_inode_readahead_blks);
2adf6da8 1822
66acdcf4
TT		 1823 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1824 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1825 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1826 if (nodefs || sbi->s_max_dir_size_kb)
1827 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1828
1829 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1830 return 0;
1831}
1832
66acdcf4
TT		 1833static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1834{
1835 return _ext4_show_options(seq, root->d_sb, 0);
1836}
1837
1838static int options_seq_show(struct seq_file *seq, void *offset)
1839{
1840 struct super_block *sb = seq->private;
1841 int rc;
1842
1843 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1844 rc = _ext4_show_options(seq, sb, 1);
1845 seq_puts(seq, "\n");
1846 return rc;
1847}
1848
1849static int options_open_fs(struct inode *inode, struct file *file)
1850{
d9dda78b 1851 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1852}
1853
1854static const struct file_operations ext4_seq_options_fops = {
1855 .owner = THIS_MODULE,
1856 .open = options_open_fs,
1857 .read = seq_read,
1858 .llseek = seq_lseek,
1859 .release = single_release,
1860};
1861
617ba13b 1862static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1863 int read_only)
1864{
617ba13b 1865 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1866 int res = 0;
1867
617ba13b 1868 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1869 ext4_msg(sb, KERN_ERR, "revision level too high, "
1870 "forcing read-only mode");
ac27a0ec
DK		 1871 res = MS_RDONLY;
1872 }
1873 if (read_only)
281b5995 1874 goto done;
617ba13b 1875 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1876 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1877 "running e2fsck is recommended");
c8b459f4 1878 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1879 ext4_msg(sb, KERN_WARNING,
1880 "warning: mounting fs with errors, "
1881 "running e2fsck is recommended");
ed3ce80a 1882 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1883 le16_to_cpu(es->s_mnt_count) >=
1884 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1885 ext4_msg(sb, KERN_WARNING,
1886 "warning: maximal mount count reached, "
1887 "running e2fsck is recommended");
ac27a0ec
DK		 1888 else if (le32_to_cpu(es->s_checkinterval) &&
1889 (le32_to_cpu(es->s_lastcheck) +
1890 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1891 ext4_msg(sb, KERN_WARNING,
1892 "warning: checktime reached, "
1893 "running e2fsck is recommended");
0b8e58a1 1894 if (!sbi->s_journal)
0390131b 1895 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1896 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1897 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1898 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1899 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1900 ext4_update_dynamic_rev(sb);
0390131b
FM		 1901 if (sbi->s_journal)
1902 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1903
e2d67052 1904 ext4_commit_super(sb, 1);
281b5995 1905done:
ac27a0ec 1906 if (test_opt(sb, DEBUG))
a9df9a49 1907 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1908 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1909 sb->s_blocksize,
1910 sbi->s_groups_count,
617ba13b
MC		 1911 EXT4_BLOCKS_PER_GROUP(sb),
1912 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1913 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1914
7abc52c2 1915 cleancache_init_fs(sb);
ac27a0ec
DK		 1916 return res;
1917}
1918
117fff10
TT		 1919int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1920{
1921 struct ext4_sb_info *sbi = EXT4_SB(sb);
1922 struct flex_groups *new_groups;
1923 int size;
1924
1925 if (!sbi->s_log_groups_per_flex)
1926 return 0;
1927
1928 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1929 if (size <= sbi->s_flex_groups_allocated)
1930 return 0;
1931
1932 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1933 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1934 if (!new_groups) {
1935 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1936 size / (int) sizeof(struct flex_groups));
1937 return -ENOMEM;
1938 }
1939
1940 if (sbi->s_flex_groups) {
1941 memcpy(new_groups, sbi->s_flex_groups,
1942 (sbi->s_flex_groups_allocated *
1943 sizeof(struct flex_groups)));
1944 ext4_kvfree(sbi->s_flex_groups);
1945 }
1946 sbi->s_flex_groups = new_groups;
1947 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1948 return 0;
1949}
1950
772cb7c8
JS		 1951static int ext4_fill_flex_info(struct super_block *sb)
1952{
1953 struct ext4_sb_info *sbi = EXT4_SB(sb);
1954 struct ext4_group_desc *gdp = NULL;
772cb7c8 1955 ext4_group_t flex_group;
117fff10 1956 int i, err;
772cb7c8 1957
503358ae 1958 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1959 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1960 sbi->s_log_groups_per_flex = 0;
1961 return 1;
1962 }
1963
117fff10
TT		 1964 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1965 if (err)
9933fc0a 1966 goto failed;
772cb7c8 1967
772cb7c8 1968 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1969 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1970
1971 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1972 atomic_add(ext4_free_inodes_count(sb, gdp),
1973 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1974 atomic64_add(ext4_free_group_clusters(sb, gdp),
1975 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1976 atomic_add(ext4_used_dirs_count(sb, gdp),
1977 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1978 }
1979
1980 return 1;
1981failed:
1982 return 0;
1983}
1984
feb0ab32
DW		 1985static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1986 struct ext4_group_desc *gdp)
717d50e4 1987{
feb0ab32 1988 int offset;
717d50e4 1989 __u16 crc = 0;
feb0ab32 1990 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1991
feb0ab32
DW		 1992 if ((sbi->s_es->s_feature_ro_compat &
1993 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1994 /* Use new metadata_csum algorithm */
d6a77105 1995 __le16 save_csum;
feb0ab32
DW		 1996 __u32 csum32;
1997
d6a77105 1998 save_csum = gdp->bg_checksum;
feb0ab32
DW		 1999 gdp->bg_checksum = 0;
2000 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2001 sizeof(le_group));
2002 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2003 sbi->s_desc_size);
d6a77105 2004 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2005
2006 crc = csum32 & 0xFFFF;
2007 goto out;
717d50e4
AD		 2008 }
2009
feb0ab32
DW		 2010 /* old crc16 code */
2011 offset = offsetof(struct ext4_group_desc, bg_checksum);
2012
2013 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2014 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2015 crc = crc16(crc, (__u8 *)gdp, offset);
2016 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2017 /* for checksum of struct ext4_group_desc do the rest...*/
2018 if ((sbi->s_es->s_feature_incompat &
2019 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2020 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2021 crc = crc16(crc, (__u8 *)gdp + offset,
2022 le16_to_cpu(sbi->s_es->s_desc_size) -
2023 offset);
2024
2025out:
717d50e4
AD		 2026 return cpu_to_le16(crc);
2027}
2028
feb0ab32 2029int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2030 struct ext4_group_desc *gdp)
2031{
feb0ab32
DW		 2032 if (ext4_has_group_desc_csum(sb) &&
2033 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2034 block_group, gdp)))
717d50e4
AD		 2035 return 0;
2036
2037 return 1;
2038}
2039
feb0ab32
DW		 2040void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2041 struct ext4_group_desc *gdp)
2042{
2043 if (!ext4_has_group_desc_csum(sb))
2044 return;
2045 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2046}
2047
ac27a0ec 2048/* Called at mount-time, super-block is locked */
bfff6873
LC		 2049static int ext4_check_descriptors(struct super_block *sb,
2050 ext4_group_t *first_not_zeroed)
ac27a0ec 2051{
617ba13b
MC		 2052 struct ext4_sb_info *sbi = EXT4_SB(sb);
2053 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2054 ext4_fsblk_t last_block;
bd81d8ee
LV		 2055 ext4_fsblk_t block_bitmap;
2056 ext4_fsblk_t inode_bitmap;
2057 ext4_fsblk_t inode_table;
ce421581 2058 int flexbg_flag = 0;
bfff6873 2059 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2060
ce421581
JS		 2061 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2062 flexbg_flag = 1;
2063
af5bc92d 2064 ext4_debug("Checking group descriptors");
ac27a0ec 2065
197cd65a
AM		 2066 for (i = 0; i < sbi->s_groups_count; i++) {
2067 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2068
ce421581 2069 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2070 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2071 else
2072 last_block = first_block +
617ba13b 2073 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2074
bfff6873
LC		 2075 if ((grp == sbi->s_groups_count) &&
2076 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2077 grp = i;
2078
8fadc143 2079 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2080 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2081 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2082 "Block bitmap for group %u not in group "
b31e1552 2083 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2084 return 0;
2085 }
8fadc143 2086 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2087 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2088 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2089 "Inode bitmap for group %u not in group "
b31e1552 2090 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2091 return 0;
2092 }
8fadc143 2093 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2094 if (inode_table < first_block ||
2b2d6d01 2095 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2096 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2097 "Inode table for group %u not in group "
b31e1552 2098 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2099 return 0;
2100 }
955ce5f5 2101 ext4_lock_group(sb, i);
feb0ab32 2102 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2103 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2104 "Checksum for group %u failed (%u!=%u)",
2105 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2106 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2107 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2108 ext4_unlock_group(sb, i);
8a266467 2109 return 0;
7ee1ec4c 2110 }
717d50e4 2111 }
955ce5f5 2112 ext4_unlock_group(sb, i);
ce421581
JS		 2113 if (!flexbg_flag)
2114 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2115 }
bfff6873
LC		 2116 if (NULL != first_not_zeroed)
2117 *first_not_zeroed = grp;
ac27a0ec
DK		 2118 return 1;
2119}
2120
617ba13b 2121/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2122 * the superblock) which were deleted from all directories, but held open by
2123 * a process at the time of a crash. We walk the list and try to delete these
2124 * inodes at recovery time (only with a read-write filesystem).
2125 *
2126 * In order to keep the orphan inode chain consistent during traversal (in
2127 * case of crash during recovery), we link each inode into the superblock
2128 * orphan list_head and handle it the same way as an inode deletion during
2129 * normal operation (which journals the operations for us).
2130 *
2131 * We only do an iget() and an iput() on each inode, which is very safe if we
2132 * accidentally point at an in-use or already deleted inode. The worst that
2133 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2134 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2135 * e2fsck was run on this filesystem, and it must have already done the orphan
2136 * inode cleanup for us, so we can safely abort without any further action.
2137 */
2b2d6d01
TT		 2138static void ext4_orphan_cleanup(struct super_block *sb,
2139 struct ext4_super_block *es)
ac27a0ec
DK		 2140{
2141 unsigned int s_flags = sb->s_flags;
2142 int nr_orphans = 0, nr_truncates = 0;
2143#ifdef CONFIG_QUOTA
2144 int i;
2145#endif
2146 if (!es->s_last_orphan) {
2147 jbd_debug(4, "no orphan inodes to clean up\n");
2148 return;
2149 }
2150
a8f48a95 2151 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2152 ext4_msg(sb, KERN_ERR, "write access "
2153 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2154 return;
2155 }
2156
d39195c3
AG		 2157 /* Check if feature set would not allow a r/w mount */
2158 if (!ext4_feature_set_ok(sb, 0)) {
2159 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2160 "unknown ROCOMPAT features");
2161 return;
2162 }
2163
617ba13b 2164 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2165 /* don't clear list on RO mount w/ errors */
2166 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2167 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2168 "clearing orphan list.\n");
c25f9bc6
ES		 2169 es->s_last_orphan = 0;
2170 }
ac27a0ec
DK		 2171 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2172 return;
2173 }
2174
2175 if (s_flags & MS_RDONLY) {
b31e1552 2176 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2177 sb->s_flags &= ~MS_RDONLY;
2178 }
2179#ifdef CONFIG_QUOTA
2180 /* Needed for iput() to work correctly and not trash data */
2181 sb->s_flags |= MS_ACTIVE;
2182 /* Turn on quotas so that they are updated correctly */
a2d4a646 2183 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2184 if (EXT4_SB(sb)->s_qf_names[i]) {
2185 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2186 if (ret < 0)
b31e1552
ES		 2187 ext4_msg(sb, KERN_ERR,
2188 "Cannot turn on journaled "
2189 "quota: error %d", ret);
ac27a0ec
DK		 2190 }
2191 }
2192#endif
2193
2194 while (es->s_last_orphan) {
2195 struct inode *inode;
2196
97bd42b9
JB		 2197 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2198 if (IS_ERR(inode)) {
ac27a0ec
DK		 2199 es->s_last_orphan = 0;
2200 break;
2201 }
2202
617ba13b 2203 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2204 dquot_initialize(inode);
ac27a0ec 2205 if (inode->i_nlink) {
566370a2
PT		 2206 if (test_opt(sb, DEBUG))
2207 ext4_msg(sb, KERN_DEBUG,
2208 "%s: truncating inode %lu to %lld bytes",
2209 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2210 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2211 inode->i_ino, inode->i_size);
721e3eba 2212 mutex_lock(&inode->i_mutex);
55f252c9 2213 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2214 ext4_truncate(inode);
721e3eba 2215 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2216 nr_truncates++;
2217 } else {
566370a2
PT		 2218 if (test_opt(sb, DEBUG))
2219 ext4_msg(sb, KERN_DEBUG,
2220 "%s: deleting unreferenced inode %lu",
2221 __func__, inode->i_ino);
ac27a0ec
DK		 2222 jbd_debug(2, "deleting unreferenced inode %lu\n",
2223 inode->i_ino);
2224 nr_orphans++;
2225 }
2226 iput(inode); /* The delete magic happens here! */
2227 }
2228
2b2d6d01 2229#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2230
2231 if (nr_orphans)
b31e1552
ES		 2232 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2233 PLURAL(nr_orphans));
ac27a0ec 2234 if (nr_truncates)
b31e1552
ES		 2235 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2236 PLURAL(nr_truncates));
ac27a0ec
DK		 2237#ifdef CONFIG_QUOTA
2238 /* Turn quotas off */
a2d4a646 2239 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2240 if (sb_dqopt(sb)->files[i])
287a8095 2241 dquot_quota_off(sb, i);
ac27a0ec
DK		 2242 }
2243#endif
2244 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2245}
0b8e58a1 2246
cd2291a4
ES		 2247/*
2248 * Maximal extent format file size.
2249 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2250 * extent format containers, within a sector_t, and within i_blocks
2251 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2252 * so that won't be a limiting factor.
2253 *
f17722f9
LC		 2254 * However there is other limiting factor. We do store extents in the form
2255 * of starting block and length, hence the resulting length of the extent
2256 * covering maximum file size must fit into on-disk format containers as
2257 * well. Given that length is always by 1 unit bigger than max unit (because
2258 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2259 *
cd2291a4
ES		 2260 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2261 */
f287a1a5 2262static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2263{
2264 loff_t res;
2265 loff_t upper_limit = MAX_LFS_FILESIZE;
2266
2267 /* small i_blocks in vfs inode? */
f287a1a5 2268 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2269 /*
90c699a9 2270 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2271 * i_block represent total blocks in 512 bytes
2272 * 32 == size of vfs inode i_blocks * 8
2273 */
2274 upper_limit = (1LL << 32) - 1;
2275
2276 /* total blocks in file system block size */
2277 upper_limit >>= (blkbits - 9);
2278 upper_limit <<= blkbits;
2279 }
2280
f17722f9
LC		 2281 /*
2282 * 32-bit extent-start container, ee_block. We lower the maxbytes
2283 * by one fs block, so ee_len can cover the extent of maximum file
2284 * size
2285 */
2286 res = (1LL << 32) - 1;
cd2291a4 2287 res <<= blkbits;
cd2291a4
ES		 2288
2289 /* Sanity check against vm- & vfs- imposed limits */
2290 if (res > upper_limit)
2291 res = upper_limit;
2292
2293 return res;
2294}
ac27a0ec 2295
ac27a0ec 2296/*
cd2291a4 2297 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2298 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2299 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2300 */
f287a1a5 2301static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2302{
617ba13b 2303 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2304 int meta_blocks;
2305 loff_t upper_limit;
0b8e58a1
AD		 2306 /* This is calculated to be the largest file size for a dense, block
2307 * mapped file such that the file's total number of 512-byte sectors,
2308 * including data and all indirect blocks, does not exceed (2^48 - 1).
2309 *
2310 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2311 * number of 512-byte sectors of the file.
0fc1b451
AK		 2312 */
2313
f287a1a5 2314 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2315 /*
90c699a9 2316 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2317 * the inode i_block field represents total file blocks in
2318 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2319 */
2320 upper_limit = (1LL << 32) - 1;
2321
2322 /* total blocks in file system block size */
2323 upper_limit >>= (bits - 9);
2324
2325 } else {
8180a562
AK		 2326 /*
2327 * We use 48 bit ext4_inode i_blocks
2328 * With EXT4_HUGE_FILE_FL set the i_blocks
2329 * represent total number of blocks in
2330 * file system block size
2331 */
0fc1b451
AK		 2332 upper_limit = (1LL << 48) - 1;
2333
0fc1b451
AK		 2334 }
2335
2336 /* indirect blocks */
2337 meta_blocks = 1;
2338 /* double indirect blocks */
2339 meta_blocks += 1 + (1LL << (bits-2));
2340 /* tripple indirect blocks */
2341 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2342
2343 upper_limit -= meta_blocks;
2344 upper_limit <<= bits;
ac27a0ec
DK		 2345
2346 res += 1LL << (bits-2);
2347 res += 1LL << (2*(bits-2));
2348 res += 1LL << (3*(bits-2));
2349 res <<= bits;
2350 if (res > upper_limit)
2351 res = upper_limit;
0fc1b451
AK		 2352
2353 if (res > MAX_LFS_FILESIZE)
2354 res = MAX_LFS_FILESIZE;
2355
ac27a0ec
DK		 2356 return res;
2357}
2358
617ba13b 2359static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2360 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2361{
617ba13b 2362 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2363 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2364 int has_super = 0;
2365
2366 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2367
617ba13b 2368 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2369 nr < first_meta_bg)
70bbb3e0 2370 return logical_sb_block + nr + 1;
ac27a0ec 2371 bg = sbi->s_desc_per_block * nr;
617ba13b 2372 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2373 has_super = 1;
0b8e58a1 2374
bd63f6b0
DW		 2375 /*
2376 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2377 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2378 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2379 * compensate.
2380 */
2381 if (sb->s_blocksize == 1024 && nr == 0 &&
2382 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2383 has_super++;
2384
617ba13b 2385 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2386}
2387
c9de560d
AT		 2388/**
2389 * ext4_get_stripe_size: Get the stripe size.
2390 * @sbi: In memory super block info
2391 *
2392 * If we have specified it via mount option, then
2393 * use the mount option value. If the value specified at mount time is
2394 * greater than the blocks per group use the super block value.
2395 * If the super block value is greater than blocks per group return 0.
2396 * Allocator needs it be less than blocks per group.
2397 *
2398 */
2399static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2400{
2401 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2402 unsigned long stripe_width =
2403 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2404 int ret;
c9de560d
AT		 2405
2406 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2407 ret = sbi->s_stripe;
2408 else if (stripe_width <= sbi->s_blocks_per_group)
2409 ret = stripe_width;
2410 else if (stride <= sbi->s_blocks_per_group)
2411 ret = stride;
2412 else
2413 ret = 0;
c9de560d 2414
3eb08658
DE		 2415 /*
2416 * If the stripe width is 1, this makes no sense and
2417 * we set it to 0 to turn off stripe handling code.
2418 */
2419 if (ret <= 1)
2420 ret = 0;
c9de560d 2421
3eb08658 2422 return ret;
c9de560d 2423}
ac27a0ec 2424
3197ebdb
TT		 2425/* sysfs supprt */
2426
2427struct ext4_attr {
2428 struct attribute attr;
2429 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2430 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2431 const char *, size_t);
f2d50a65
JK		 2432 union {
2433 int offset;
2434 int deprecated_val;
2435 } u;
3197ebdb
TT		 2436};
2437
27dd4385
LC		 2438static int parse_strtoull(const char *buf,
2439 unsigned long long max, unsigned long long *value)
2440{
2441 int ret;
2442
2443 ret = kstrtoull(skip_spaces(buf), 0, value);
2444 if (!ret && *value > max)
2445 ret = -EINVAL;
2446 return ret;
2447}
2448
3197ebdb
TT		 2449static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2450 struct ext4_sb_info *sbi,
2451 char *buf)
2452{
2453 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2454 (s64) EXT4_C2B(sbi,
2455 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2456}
2457
2458static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2459 struct ext4_sb_info *sbi, char *buf)
2460{
2461 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2462
f613dfcb
TT		 2463 if (!sb->s_bdev->bd_part)
2464 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2465 return snprintf(buf, PAGE_SIZE, "%lu\n",
2466 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2467 sbi->s_sectors_written_start) >> 1);
2468}
2469
2470static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2471 struct ext4_sb_info *sbi, char *buf)
2472{
2473 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2474
f613dfcb
TT		 2475 if (!sb->s_bdev->bd_part)
2476 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2477 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2478 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2479 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2480 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2481}
2482
2483static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2484 struct ext4_sb_info *sbi,
2485 const char *buf, size_t count)
2486{
2487 unsigned long t;
e1091b15 2488 int ret;
3197ebdb 2489
e1091b15
LC		 2490 ret = kstrtoul(skip_spaces(buf), 0, &t);
2491 if (ret)
2492 return ret;
3197ebdb 2493
e1091b15 2494 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2495 return -EINVAL;
2496
2497 sbi->s_inode_readahead_blks = t;
2498 return count;
2499}
2500
2501static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2502 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2503{
f2d50a65 2504 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2505
2506 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2507}
2508
2509static ssize_t sbi_ui_store(struct ext4_attr *a,
2510 struct ext4_sb_info *sbi,
2511 const char *buf, size_t count)
2512{
f2d50a65 2513 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2514 unsigned long t;
e1091b15 2515 int ret;
3197ebdb 2516
e1091b15
LC		 2517 ret = kstrtoul(skip_spaces(buf), 0, &t);
2518 if (ret)
2519 return ret;
3197ebdb
TT		 2520 *ui = t;
2521 return count;
2522}
2523
52c198c6
LC		 2524static ssize_t es_ui_show(struct ext4_attr *a,
2525 struct ext4_sb_info *sbi, char *buf)
2526{
2527
2528 unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
2529 a->u.offset);
2530
2531 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2532}
2533
27dd4385
LC		 2534static ssize_t reserved_clusters_show(struct ext4_attr *a,
2535 struct ext4_sb_info *sbi, char *buf)
2536{
2537 return snprintf(buf, PAGE_SIZE, "%llu\n",
2538 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2539}
2540
2541static ssize_t reserved_clusters_store(struct ext4_attr *a,
2542 struct ext4_sb_info *sbi,
2543 const char *buf, size_t count)
2544{
2545 unsigned long long val;
2546 int ret;
2547
2548 if (parse_strtoull(buf, -1ULL, &val))
2549 return -EINVAL;
2550 ret = ext4_reserve_clusters(sbi, val);
2551
2552 return ret ? ret : count;
2553}
2554
2c0544b2
TT		 2555static ssize_t trigger_test_error(struct ext4_attr *a,
2556 struct ext4_sb_info *sbi,
2557 const char *buf, size_t count)
2558{
2559 int len = count;
2560
2561 if (!capable(CAP_SYS_ADMIN))
2562 return -EPERM;
2563
2564 if (len && buf[len-1] == '\n')
2565 len--;
2566
2567 if (len)
2568 ext4_error(sbi->s_sb, "%.*s", len, buf);
2569 return count;
2570}
2571
f2d50a65
JK		 2572static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2573 struct ext4_sb_info *sbi, char *buf)
2574{
2575 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2576}
2577
3197ebdb
TT		 2578#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2579static struct ext4_attr ext4_attr_##_name = { \
2580 .attr = {.name = __stringify(_name), .mode = _mode }, \
2581 .show = _show, \
2582 .store = _store, \
f2d50a65
JK		 2583 .u = { \
2584 .offset = offsetof(struct ext4_sb_info, _elname),\
2585 }, \
3197ebdb 2586}
52c198c6
LC		 2587
2588#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
2589static struct ext4_attr ext4_attr_##_name = { \
2590 .attr = {.name = __stringify(_name), .mode = _mode }, \
2591 .show = _show, \
2592 .store = _store, \
2593 .u = { \
2594 .offset = offsetof(struct ext4_super_block, _elname), \
2595 }, \
2596}
2597
3197ebdb
TT		 2598#define EXT4_ATTR(name, mode, show, store) \
2599static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2600
857ac889 2601#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2602#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2603#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
52c198c6
LC		 2604
2605#define EXT4_RO_ATTR_ES_UI(name, elname) \
2606 EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
3197ebdb
TT		 2607#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2608 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
52c198c6 2609
3197ebdb 2610#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2611#define EXT4_DEPRECATED_ATTR(_name, _val) \
2612static struct ext4_attr ext4_attr_##_name = { \
2613 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2614 .show = sbi_deprecated_show, \
2615 .u = { \
2616 .deprecated_val = _val, \
2617 }, \
2618}
3197ebdb
TT		 2619
2620EXT4_RO_ATTR(delayed_allocation_blocks);
2621EXT4_RO_ATTR(session_write_kbytes);
2622EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2623EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2624EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2625 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2626EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2627EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2628EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2629EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2630EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2631EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2632EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2633EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2634EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2635EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2636EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2637EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2638EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2639EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2640EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2641EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
52c198c6
LC		 2642EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
2643EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
2644EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
3197ebdb
TT		 2645
2646static struct attribute *ext4_attrs[] = {
2647 ATTR_LIST(delayed_allocation_blocks),
2648 ATTR_LIST(session_write_kbytes),
2649 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2650 ATTR_LIST(reserved_clusters),
3197ebdb 2651 ATTR_LIST(inode_readahead_blks),
11013911 2652 ATTR_LIST(inode_goal),
3197ebdb
TT		 2653 ATTR_LIST(mb_stats),
2654 ATTR_LIST(mb_max_to_scan),
2655 ATTR_LIST(mb_min_to_scan),
2656 ATTR_LIST(mb_order2_req),
2657 ATTR_LIST(mb_stream_req),
2658 ATTR_LIST(mb_group_prealloc),
55138e0b 2659 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2660 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2661 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2662 ATTR_LIST(err_ratelimit_interval_ms),
2663 ATTR_LIST(err_ratelimit_burst),
2664 ATTR_LIST(warning_ratelimit_interval_ms),
2665 ATTR_LIST(warning_ratelimit_burst),
2666 ATTR_LIST(msg_ratelimit_interval_ms),
2667 ATTR_LIST(msg_ratelimit_burst),
52c198c6
LC		 2668 ATTR_LIST(errors_count),
2669 ATTR_LIST(first_error_time),
2670 ATTR_LIST(last_error_time),
3197ebdb
TT		 2671 NULL,
2672};
2673
857ac889
LC		 2674/* Features this copy of ext4 supports */
2675EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2676EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2677EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2678
2679static struct attribute *ext4_feat_attrs[] = {
2680 ATTR_LIST(lazy_itable_init),
27ee40df 2681 ATTR_LIST(batched_discard),
5e7bbef1 2682 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2683 NULL,
2684};
2685
3197ebdb
TT		 2686static ssize_t ext4_attr_show(struct kobject *kobj,
2687 struct attribute *attr, char *buf)
2688{
2689 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2690 s_kobj);
2691 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2692
2693 return a->show ? a->show(a, sbi, buf) : 0;
2694}
2695
2696static ssize_t ext4_attr_store(struct kobject *kobj,
2697 struct attribute *attr,
2698 const char *buf, size_t len)
2699{
2700 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2701 s_kobj);
2702 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2703
2704 return a->store ? a->store(a, sbi, buf, len) : 0;
2705}
2706
2707static void ext4_sb_release(struct kobject *kobj)
2708{
2709 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2710 s_kobj);
2711 complete(&sbi->s_kobj_unregister);
2712}
2713
52cf25d0 2714static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2715 .show = ext4_attr_show,
2716 .store = ext4_attr_store,
2717};
2718
2719static struct kobj_type ext4_ktype = {
2720 .default_attrs = ext4_attrs,
2721 .sysfs_ops = &ext4_attr_ops,
2722 .release = ext4_sb_release,
2723};
2724
857ac889
LC		 2725static void ext4_feat_release(struct kobject *kobj)
2726{
2727 complete(&ext4_feat->f_kobj_unregister);
2728}
2729
c7f72543
LC		 2730static ssize_t ext4_feat_show(struct kobject *kobj,
2731 struct attribute *attr, char *buf)
2732{
2733 return snprintf(buf, PAGE_SIZE, "supported\n");
2734}
2735
2736/*
2737 * We can not use ext4_attr_show/store because it relies on the kobject
2738 * being embedded in the ext4_sb_info structure which is definitely not
2739 * true in this case.
2740 */
2741static const struct sysfs_ops ext4_feat_ops = {
2742 .show = ext4_feat_show,
2743 .store = NULL,
2744};
2745
857ac889
LC		 2746static struct kobj_type ext4_feat_ktype = {
2747 .default_attrs = ext4_feat_attrs,
c7f72543 2748 .sysfs_ops = &ext4_feat_ops,
857ac889
LC		 2749 .release = ext4_feat_release,
2750};
2751
a13fb1a4
ES		 2752/*
2753 * Check whether this filesystem can be mounted based on
2754 * the features present and the RDONLY/RDWR mount requested.
2755 * Returns 1 if this filesystem can be mounted as requested,
2756 * 0 if it cannot be.
2757 */
2758static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2759{
2760 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2761 ext4_msg(sb, KERN_ERR,
2762 "Couldn't mount because of "
2763 "unsupported optional features (%x)",
2764 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2765 ~EXT4_FEATURE_INCOMPAT_SUPP));
2766 return 0;
2767 }
2768
2769 if (readonly)
2770 return 1;
2771
2772 /* Check that feature set is OK for a read-write mount */
2773 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2774 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2775 "unsupported optional features (%x)",
2776 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2777 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2778 return 0;
2779 }
2780 /*
2781 * Large file size enabled file system can only be mounted
2782 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2783 */
2784 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2785 if (sizeof(blkcnt_t) < sizeof(u64)) {
2786 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2787 "cannot be mounted RDWR without "
2788 "CONFIG_LBDAF");
2789 return 0;
2790 }
2791 }
bab08ab9
TT		 2792 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2793 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2794 ext4_msg(sb, KERN_ERR,
2795 "Can't support bigalloc feature without "
2796 "extents feature\n");
2797 return 0;
2798 }
7c319d32
AK		 2799
2800#ifndef CONFIG_QUOTA
2801 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2802 !readonly) {
2803 ext4_msg(sb, KERN_ERR,
2804 "Filesystem with quota feature cannot be mounted RDWR "
2805 "without CONFIG_QUOTA");
2806 return 0;
2807 }
2808#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2809 return 1;
2810}
2811
66e61a9e
TT		 2812/*
2813 * This function is called once a day if we have errors logged
2814 * on the file system
2815 */
2816static void print_daily_error_info(unsigned long arg)
2817{
2818 struct super_block *sb = (struct super_block *) arg;
2819 struct ext4_sb_info *sbi;
2820 struct ext4_super_block *es;
2821
2822 sbi = EXT4_SB(sb);
2823 es = sbi->s_es;
2824
2825 if (es->s_error_count)
ae0f78de
TT		 2826 /* fsck newer than v1.41.13 is needed to clean this condition. */
2827 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2828 le32_to_cpu(es->s_error_count));
2829 if (es->s_first_error_time) {
ae0f78de 2830 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2831 sb->s_id, le32_to_cpu(es->s_first_error_time),
2832 (int) sizeof(es->s_first_error_func),
2833 es->s_first_error_func,
2834 le32_to_cpu(es->s_first_error_line));
2835 if (es->s_first_error_ino)
2836 printk(": inode %u",
2837 le32_to_cpu(es->s_first_error_ino));
2838 if (es->s_first_error_block)
2839 printk(": block %llu", (unsigned long long)
2840 le64_to_cpu(es->s_first_error_block));
2841 printk("\n");
2842 }
2843 if (es->s_last_error_time) {
ae0f78de 2844 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2845 sb->s_id, le32_to_cpu(es->s_last_error_time),
2846 (int) sizeof(es->s_last_error_func),
2847 es->s_last_error_func,
2848 le32_to_cpu(es->s_last_error_line));
2849 if (es->s_last_error_ino)
2850 printk(": inode %u",
2851 le32_to_cpu(es->s_last_error_ino));
2852 if (es->s_last_error_block)
2853 printk(": block %llu", (unsigned long long)
2854 le64_to_cpu(es->s_last_error_block));
2855 printk("\n");
2856 }
2857 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2858}
2859
bfff6873
LC		 2860/* Find next suitable group and run ext4_init_inode_table */
2861static int ext4_run_li_request(struct ext4_li_request *elr)
2862{
2863 struct ext4_group_desc *gdp = NULL;
2864 ext4_group_t group, ngroups;
2865 struct super_block *sb;
2866 unsigned long timeout = 0;
2867 int ret = 0;
2868
2869 sb = elr->lr_super;
2870 ngroups = EXT4_SB(sb)->s_groups_count;
2871
8e8ad8a5 2872 sb_start_write(sb);
bfff6873
LC		 2873 for (group = elr->lr_next_group; group < ngroups; group++) {
2874 gdp = ext4_get_group_desc(sb, group, NULL);
2875 if (!gdp) {
2876 ret = 1;
2877 break;
2878 }
2879
2880 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2881 break;
2882 }
2883
7f511862 2884 if (group >= ngroups)
bfff6873
LC		 2885 ret = 1;
2886
2887 if (!ret) {
2888 timeout = jiffies;
2889 ret = ext4_init_inode_table(sb, group,
2890 elr->lr_timeout ? 0 : 1);
2891 if (elr->lr_timeout == 0) {
51ce6511
LC		 2892 timeout = (jiffies - timeout) *
2893 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2894 elr->lr_timeout = timeout;
2895 }
2896 elr->lr_next_sched = jiffies + elr->lr_timeout;
2897 elr->lr_next_group = group + 1;
2898 }
8e8ad8a5 2899 sb_end_write(sb);
bfff6873
LC		 2900
2901 return ret;
2902}
2903
2904/*
2905 * Remove lr_request from the list_request and free the
4ed5c033 2906 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2907 */
2908static void ext4_remove_li_request(struct ext4_li_request *elr)
2909{
2910 struct ext4_sb_info *sbi;
2911
2912 if (!elr)
2913 return;
2914
2915 sbi = elr->lr_sbi;
2916
2917 list_del(&elr->lr_request);
2918 sbi->s_li_request = NULL;
2919 kfree(elr);
2920}
2921
2922static void ext4_unregister_li_request(struct super_block *sb)
2923{
1bb933fb
LC		 2924 mutex_lock(&ext4_li_mtx);
2925 if (!ext4_li_info) {
2926 mutex_unlock(&ext4_li_mtx);
bfff6873 2927 return;
1bb933fb 2928 }
bfff6873
LC		 2929
2930 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2931 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2932 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2933 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2934}
2935
8f1f7453
ES		 2936static struct task_struct *ext4_lazyinit_task;
2937
bfff6873
LC		 2938/*
2939 * This is the function where ext4lazyinit thread lives. It walks
2940 * through the request list searching for next scheduled filesystem.
2941 * When such a fs is found, run the lazy initialization request
2942 * (ext4_rn_li_request) and keep track of the time spend in this
2943 * function. Based on that time we compute next schedule time of
2944 * the request. When walking through the list is complete, compute
2945 * next waking time and put itself into sleep.
2946 */
2947static int ext4_lazyinit_thread(void *arg)
2948{
2949 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2950 struct list_head *pos, *n;
2951 struct ext4_li_request *elr;
4ed5c033 2952 unsigned long next_wakeup, cur;
bfff6873
LC		 2953
2954 BUG_ON(NULL == eli);
2955
bfff6873
LC		 2956cont_thread:
2957 while (true) {
2958 next_wakeup = MAX_JIFFY_OFFSET;
2959
2960 mutex_lock(&eli->li_list_mtx);
2961 if (list_empty(&eli->li_request_list)) {
2962 mutex_unlock(&eli->li_list_mtx);
2963 goto exit_thread;
2964 }
2965
2966 list_for_each_safe(pos, n, &eli->li_request_list) {
2967 elr = list_entry(pos, struct ext4_li_request,
2968 lr_request);
2969
b2c78cd0
TT		 2970 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2971 if (ext4_run_li_request(elr) != 0) {
2972 /* error, remove the lazy_init job */
2973 ext4_remove_li_request(elr);
2974 continue;
2975 }
bfff6873
LC		 2976 }
2977
2978 if (time_before(elr->lr_next_sched, next_wakeup))
2979 next_wakeup = elr->lr_next_sched;
2980 }
2981 mutex_unlock(&eli->li_list_mtx);
2982
a0acae0e 2983 try_to_freeze();
bfff6873 2984
4ed5c033
LC		 2985 cur = jiffies;
2986 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2987 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2988 cond_resched();
2989 continue;
2990 }
2991
4ed5c033
LC		 2992 schedule_timeout_interruptible(next_wakeup - cur);
2993
8f1f7453
ES		 2994 if (kthread_should_stop()) {
2995 ext4_clear_request_list();
2996 goto exit_thread;
2997 }
bfff6873
LC		 2998 }
2999
3000exit_thread:
3001 /*
3002 * It looks like the request list is empty, but we need
3003 * to check it under the li_list_mtx lock, to prevent any
3004 * additions into it, and of course we should lock ext4_li_mtx
3005 * to atomically free the list and ext4_li_info, because at
3006 * this point another ext4 filesystem could be registering
3007 * new one.
3008 */
3009 mutex_lock(&ext4_li_mtx);
3010 mutex_lock(&eli->li_list_mtx);
3011 if (!list_empty(&eli->li_request_list)) {
3012 mutex_unlock(&eli->li_list_mtx);
3013 mutex_unlock(&ext4_li_mtx);
3014 goto cont_thread;
3015 }
3016 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3017 kfree(ext4_li_info);
3018 ext4_li_info = NULL;
3019 mutex_unlock(&ext4_li_mtx);
3020
3021 return 0;
3022}
3023
3024static void ext4_clear_request_list(void)
3025{
3026 struct list_head *pos, *n;
3027 struct ext4_li_request *elr;
3028
3029 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3030 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3031 elr = list_entry(pos, struct ext4_li_request,
3032 lr_request);
3033 ext4_remove_li_request(elr);
3034 }
3035 mutex_unlock(&ext4_li_info->li_list_mtx);
3036}
3037
3038static int ext4_run_lazyinit_thread(void)
3039{
8f1f7453
ES		 3040 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3041 ext4_li_info, "ext4lazyinit");
3042 if (IS_ERR(ext4_lazyinit_task)) {
3043 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3044 ext4_clear_request_list();
bfff6873
LC		 3045 kfree(ext4_li_info);
3046 ext4_li_info = NULL;
92b97816 3047 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3048 "initialization thread\n",
3049 err);
3050 return err;
3051 }
3052 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3053 return 0;
3054}
3055
3056/*
3057 * Check whether it make sense to run itable init. thread or not.
3058 * If there is at least one uninitialized inode table, return
3059 * corresponding group number, else the loop goes through all
3060 * groups and return total number of groups.
3061 */
3062static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3063{
3064 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3065 struct ext4_group_desc *gdp = NULL;
3066
3067 for (group = 0; group < ngroups; group++) {
3068 gdp = ext4_get_group_desc(sb, group, NULL);
3069 if (!gdp)
3070 continue;
3071
3072 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3073 break;
3074 }
3075
3076 return group;
3077}
3078
3079static int ext4_li_info_new(void)
3080{
3081 struct ext4_lazy_init *eli = NULL;
3082
3083 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3084 if (!eli)
3085 return -ENOMEM;
3086
bfff6873
LC		 3087 INIT_LIST_HEAD(&eli->li_request_list);
3088 mutex_init(&eli->li_list_mtx);
3089
bfff6873
LC		 3090 eli->li_state |= EXT4_LAZYINIT_QUIT;
3091
3092 ext4_li_info = eli;
3093
3094 return 0;
3095}
3096
3097static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3098 ext4_group_t start)
3099{
3100 struct ext4_sb_info *sbi = EXT4_SB(sb);
3101 struct ext4_li_request *elr;
bfff6873
LC		 3102
3103 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3104 if (!elr)
3105 return NULL;
3106
3107 elr->lr_super = sb;
3108 elr->lr_sbi = sbi;
3109 elr->lr_next_group = start;
3110
3111 /*
3112 * Randomize first schedule time of the request to
3113 * spread the inode table initialization requests
3114 * better.
3115 */
dd1f723b
TT		 3116 elr->lr_next_sched = jiffies + (prandom_u32() %
3117 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3118 return elr;
3119}
3120
7f511862
TT		 3121int ext4_register_li_request(struct super_block *sb,
3122 ext4_group_t first_not_zeroed)
bfff6873
LC		 3123{
3124 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3125 struct ext4_li_request *elr = NULL;
bfff6873 3126 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3127 int ret = 0;
bfff6873 3128
7f511862 3129 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3130 if (sbi->s_li_request != NULL) {
3131 /*
3132 * Reset timeout so it can be computed again, because
3133 * s_li_wait_mult might have changed.
3134 */
3135 sbi->s_li_request->lr_timeout = 0;
7f511862 3136 goto out;
51ce6511 3137 }
bfff6873
LC		 3138
3139 if (first_not_zeroed == ngroups ||
3140 (sb->s_flags & MS_RDONLY) ||
55ff3840 3141 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3142 goto out;
bfff6873
LC		 3143
3144 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3145 if (!elr) {
3146 ret = -ENOMEM;
3147 goto out;
3148 }
bfff6873
LC		 3149
3150 if (NULL == ext4_li_info) {
3151 ret = ext4_li_info_new();
3152 if (ret)
3153 goto out;
3154 }
3155
3156 mutex_lock(&ext4_li_info->li_list_mtx);
3157 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3158 mutex_unlock(&ext4_li_info->li_list_mtx);
3159
3160 sbi->s_li_request = elr;
46e4690b
TM		 3161 /*
3162 * set elr to NULL here since it has been inserted to
3163 * the request_list and the removal and free of it is
3164 * handled by ext4_clear_request_list from now on.
3165 */
3166 elr = NULL;
bfff6873
LC		 3167
3168 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3169 ret = ext4_run_lazyinit_thread();
3170 if (ret)
3171 goto out;
3172 }
bfff6873 3173out:
beed5ecb
NK		 3174 mutex_unlock(&ext4_li_mtx);
3175 if (ret)
bfff6873 3176 kfree(elr);
bfff6873
LC		 3177 return ret;
3178}
3179
3180/*
3181 * We do not need to lock anything since this is called on
3182 * module unload.
3183 */
3184static void ext4_destroy_lazyinit_thread(void)
3185{
3186 /*
3187 * If thread exited earlier
3188 * there's nothing to be done.
3189 */
8f1f7453 3190 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3191 return;
3192
8f1f7453 3193 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3194}
3195
25ed6e8a
DW		 3196static int set_journal_csum_feature_set(struct super_block *sb)
3197{
3198 int ret = 1;
3199 int compat, incompat;
3200 struct ext4_sb_info *sbi = EXT4_SB(sb);
3201
3202 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3203 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
db9ee220 3204 /* journal checksum v3 */
25ed6e8a 3205 compat = 0;
db9ee220 3206 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3207 } else {
3208 /* journal checksum v1 */
3209 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3210 incompat = 0;
3211 }
3212
feb8c6d3
DW		 3213 jbd2_journal_clear_features(sbi->s_journal,
3214 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3215 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3216 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3217 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3218 ret = jbd2_journal_set_features(sbi->s_journal,
3219 compat, 0,
3220 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3221 incompat);
3222 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3223 ret = jbd2_journal_set_features(sbi->s_journal,
3224 compat, 0,
3225 incompat);
3226 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3227 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3228 } else {
feb8c6d3
DW		 3229 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3230 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3231 }
3232
3233 return ret;
3234}
3235
952fc18e
TT		 3236/*
3237 * Note: calculating the overhead so we can be compatible with
3238 * historical BSD practice is quite difficult in the face of
3239 * clusters/bigalloc. This is because multiple metadata blocks from
3240 * different block group can end up in the same allocation cluster.
3241 * Calculating the exact overhead in the face of clustered allocation
3242 * requires either O(all block bitmaps) in memory or O(number of block
3243 * groups**2) in time. We will still calculate the superblock for
3244 * older file systems --- and if we come across with a bigalloc file
3245 * system with zero in s_overhead_clusters the estimate will be close to
3246 * correct especially for very large cluster sizes --- but for newer
3247 * file systems, it's better to calculate this figure once at mkfs
3248 * time, and store it in the superblock. If the superblock value is
3249 * present (even for non-bigalloc file systems), we will use it.
3250 */
3251static int count_overhead(struct super_block *sb, ext4_group_t grp,
3252 char *buf)
3253{
3254 struct ext4_sb_info *sbi = EXT4_SB(sb);
3255 struct ext4_group_desc *gdp;
3256 ext4_fsblk_t first_block, last_block, b;
3257 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3258 int s, j, count = 0;
3259
0548bbb8
TT		 3260 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3261 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3262 sbi->s_itb_per_group + 2);
3263
952fc18e
TT		 3264 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3265 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3266 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3267 for (i = 0; i < ngroups; i++) {
3268 gdp = ext4_get_group_desc(sb, i, NULL);
3269 b = ext4_block_bitmap(sb, gdp);
3270 if (b >= first_block && b <= last_block) {
3271 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3272 count++;
3273 }
3274 b = ext4_inode_bitmap(sb, gdp);
3275 if (b >= first_block && b <= last_block) {
3276 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3277 count++;
3278 }
3279 b = ext4_inode_table(sb, gdp);
3280 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3281 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3282 int c = EXT4_B2C(sbi, b - first_block);
3283 ext4_set_bit(c, buf);
3284 count++;
3285 }
3286 if (i != grp)
3287 continue;
3288 s = 0;
3289 if (ext4_bg_has_super(sb, grp)) {
3290 ext4_set_bit(s++, buf);
3291 count++;
3292 }
3293 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3294 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3295 count++;
3296 }
3297 }
3298 if (!count)
3299 return 0;
3300 return EXT4_CLUSTERS_PER_GROUP(sb) -
3301 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3302}
3303
3304/*
3305 * Compute the overhead and stash it in sbi->s_overhead
3306 */
3307int ext4_calculate_overhead(struct super_block *sb)
3308{
3309 struct ext4_sb_info *sbi = EXT4_SB(sb);
3310 struct ext4_super_block *es = sbi->s_es;
3311 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3312 ext4_fsblk_t overhead = 0;
3313 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3314
952fc18e
TT		 3315 if (!buf)
3316 return -ENOMEM;
3317
3318 /*
3319 * Compute the overhead (FS structures). This is constant
3320 * for a given filesystem unless the number of block groups
3321 * changes so we cache the previous value until it does.
3322 */
3323
3324 /*
3325 * All of the blocks before first_data_block are overhead
3326 */
3327 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3328
3329 /*
3330 * Add the overhead found in each block group
3331 */
3332 for (i = 0; i < ngroups; i++) {
3333 int blks;
3334
3335 blks = count_overhead(sb, i, buf);
3336 overhead += blks;
3337 if (blks)
3338 memset(buf, 0, PAGE_SIZE);
3339 cond_resched();
3340 }
0875a2b4
ES		 3341 /* Add the journal blocks as well */
3342 if (sbi->s_journal)
810da240 3343 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3344
952fc18e
TT		 3345 sbi->s_overhead = overhead;
3346 smp_wmb();
3347 free_page((unsigned long) buf);
3348 return 0;
3349}
3350
27dd4385 3351
30fac0f7 3352static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3353{
3354 ext4_fsblk_t resv_clusters;
3355
30fac0f7
JK		 3356 /*
3357 * There's no need to reserve anything when we aren't using extents.
3358 * The space estimates are exact, there are no unwritten extents,
3359 * hole punching doesn't need new metadata... This is needed especially
3360 * to keep ext2/3 backward compatibility.
3361 */
3362 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3363 return 0;
27dd4385
LC		 3364 /*
3365 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3366 * This should cover the situations where we can not afford to run
3367 * out of space like for example punch hole, or converting
556615dc 3368 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3369 * allocation would require 1, or 2 blocks, higher numbers are
3370 * very rare.
3371 */
30fac0f7
JK		 3372 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3373 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3374
3375 do_div(resv_clusters, 50);
3376 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3377
3378 return resv_clusters;
3379}
3380
3381
3382static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3383{
3384 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3385 sbi->s_cluster_bits;
3386
3387 if (count >= clusters)
3388 return -EINVAL;
3389
3390 atomic64_set(&sbi->s_resv_clusters, count);
3391 return 0;
3392}
3393
2b2d6d01 3394static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3395{
d4c402d9 3396 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3397 struct buffer_head *bh;
617ba13b
MC		 3398 struct ext4_super_block *es = NULL;
3399 struct ext4_sb_info *sbi;
3400 ext4_fsblk_t block;
3401 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3402 ext4_fsblk_t logical_sb_block;
ac27a0ec 3403 unsigned long offset = 0;
ac27a0ec
DK		 3404 unsigned long journal_devnum = 0;
3405 unsigned long def_mount_opts;
3406 struct inode *root;
9f6200bb 3407 char *cp;
0390131b 3408 const char *descr;
dcc7dae3 3409 int ret = -ENOMEM;
281b5995 3410 int blocksize, clustersize;
4ec11028
TT		 3411 unsigned int db_count;
3412 unsigned int i;
281b5995 3413 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3414 __u64 blocks_count;
07aa2ea1 3415 int err = 0;
b3881f74 3416 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3417 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3418
3419 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3420 if (!sbi)
dcc7dae3 3421 goto out_free_orig;
705895b6
PE		 3422
3423 sbi->s_blockgroup_lock =
3424 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3425 if (!sbi->s_blockgroup_lock) {
3426 kfree(sbi);
dcc7dae3 3427 goto out_free_orig;
705895b6 3428 }
ac27a0ec 3429 sb->s_fs_info = sbi;
2c0544b2 3430 sbi->s_sb = sb;
240799cd 3431 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3432 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3433 if (sb->s_bdev->bd_part)
3434 sbi->s_sectors_written_start =
3435 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3436
9f6200bb
TT		 3437 /* Cleanup superblock name */
3438 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3439 *cp = '!';
3440
07aa2ea1 3441 /* -EINVAL is default */
dcc7dae3 3442 ret = -EINVAL;
617ba13b 3443 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3444 if (!blocksize) {
b31e1552 3445 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3446 goto out_fail;
3447 }
3448
3449 /*
617ba13b 3450 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3451 * block sizes. We need to calculate the offset from buffer start.
3452 */
617ba13b 3453 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3454 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3455 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3456 } else {
70bbb3e0 3457 logical_sb_block = sb_block;
ac27a0ec
DK		 3458 }
3459
a8ac900b 3460 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3461 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3462 goto out_fail;
3463 }
3464 /*
3465 * Note: s_es must be initialized as soon as possible because
617ba13b 3466 * some ext4 macro-instructions depend on its value
ac27a0ec 3467 */
2716b802 3468 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3469 sbi->s_es = es;
3470 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3471 if (sb->s_magic != EXT4_SUPER_MAGIC)
3472 goto cantfind_ext4;
afc32f7e 3473 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3474
feb0ab32
DW		 3475 /* Warn if metadata_csum and gdt_csum are both set. */
3476 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3477 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3478 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3479 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3480 "redundant flags; please run fsck.");
3481
d25425f8
DW		 3482 /* Check for a known checksum algorithm */
3483 if (!ext4_verify_csum_type(sb, es)) {
3484 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3485 "unknown checksum algorithm.");
3486 silent = 1;
3487 goto cantfind_ext4;
3488 }
3489
0441984a
DW		 3490 /* Load the checksum driver */
3491 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3492 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3493 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3494 if (IS_ERR(sbi->s_chksum_driver)) {
3495 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3496 ret = PTR_ERR(sbi->s_chksum_driver);
3497 sbi->s_chksum_driver = NULL;
3498 goto failed_mount;
3499 }
3500 }
3501
a9c47317
DW		 3502 /* Check superblock checksum */
3503 if (!ext4_superblock_csum_verify(sb, es)) {
3504 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3505 "invalid superblock checksum. Run e2fsck?");
3506 silent = 1;
3507 goto cantfind_ext4;
3508 }
3509
3510 /* Precompute checksum seed for all metadata */
3511 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3512 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3513 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3514 sizeof(es->s_uuid));
3515
ac27a0ec
DK		 3516 /* Set defaults before we parse the mount options */
3517 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3518 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3519 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3520 set_opt(sb, DEBUG);
87f26807 3521 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3522 set_opt(sb, GRPID);
617ba13b 3523 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3524 set_opt(sb, NO_UID32);
ea663336 3525 /* xattr user namespace & acls are now defaulted on */
ea663336 3526 set_opt(sb, XATTR_USER);
03010a33 3527#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3528 set_opt(sb, POSIX_ACL);
2e7842b8 3529#endif
617ba13b 3530 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3531 set_opt(sb, JOURNAL_DATA);
617ba13b 3532 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3533 set_opt(sb, ORDERED_DATA);
617ba13b 3534 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3535 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3536
3537 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3538 set_opt(sb, ERRORS_PANIC);
bb4f397a 3539 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3540 set_opt(sb, ERRORS_CONT);
bb4f397a 3541 else
fd8c37ec 3542 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3543 /* block_validity enabled by default; disable with noblock_validity */
3544 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3545 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3546 set_opt(sb, DISCARD);
ac27a0ec 3547
08cefc7a
EB		 3548 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3549 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3550 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3551 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3552 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3553
8b67f04a 3554 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3555 set_opt(sb, BARRIER);
ac27a0ec 3556
dd919b98
AK		 3557 /*
3558 * enable delayed allocation by default
3559 * Use -o nodelalloc to turn it off
3560 */
bc0b75f7 3561 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3562 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3563 set_opt(sb, DELALLOC);
dd919b98 3564
51ce6511
LC		 3565 /*
3566 * set default s_li_wait_mult for lazyinit, for the case there is
3567 * no mount option specified.
3568 */
3569 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3570
8b67f04a 3571 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3572 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3573 ext4_msg(sb, KERN_WARNING,
3574 "failed to parse options in superblock: %s",
3575 sbi->s_es->s_mount_opts);
3576 }
5a916be1 3577 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3578 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3579 &journal_ioprio, 0))
ac27a0ec
DK		 3580 goto failed_mount;
3581
56889787
TT		 3582 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3583 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3584 "with data=journal disables delayed "
3585 "allocation and O_DIRECT support!\n");
3586 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3587 ext4_msg(sb, KERN_ERR, "can't mount with "
3588 "both data=journal and delalloc");
3589 goto failed_mount;
3590 }
3591 if (test_opt(sb, DIOREAD_NOLOCK)) {
3592 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3593 "both data=journal and dioread_nolock");
56889787
TT		 3594 goto failed_mount;
3595 }
3596 if (test_opt(sb, DELALLOC))
3597 clear_opt(sb, DELALLOC);
3598 }
3599
ac27a0ec 3600 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3601 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3602
617ba13b
MC		 3603 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3604 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3605 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3606 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3607 ext4_msg(sb, KERN_WARNING,
3608 "feature flags set on rev 0 fs, "
3609 "running e2fsck is recommended");
469108ff 3610
ed3654eb
TT		 3611 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3612 set_opt2(sb, HURD_COMPAT);
3613 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3614 EXT4_FEATURE_INCOMPAT_64BIT)) {
3615 ext4_msg(sb, KERN_ERR,
3616 "The Hurd can't support 64-bit file systems");
3617 goto failed_mount;
3618 }
3619 }
3620
2035e776
TT		 3621 if (IS_EXT2_SB(sb)) {
3622 if (ext2_feature_set_ok(sb))
3623 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3624 "using the ext4 subsystem");
3625 else {
3626 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3627 "to feature incompatibilities");
3628 goto failed_mount;
3629 }
3630 }
3631
3632 if (IS_EXT3_SB(sb)) {
3633 if (ext3_feature_set_ok(sb))
3634 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3635 "using the ext4 subsystem");
3636 else {
3637 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3638 "to feature incompatibilities");
3639 goto failed_mount;
3640 }
3641 }
3642
ac27a0ec
DK		 3643 /*
3644 * Check feature flags regardless of the revision level, since we
3645 * previously didn't change the revision level when setting the flags,
3646 * so there is a chance incompat flags are set on a rev 0 filesystem.
3647 */
a13fb1a4 3648 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3649 goto failed_mount;
a13fb1a4 3650
261cb20c 3651 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3652 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3653 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3654 ext4_msg(sb, KERN_ERR,
3655 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3656 goto failed_mount;
3657 }
3658
ac27a0ec 3659 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3660 /* Validate the filesystem blocksize */
3661 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3662 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3663 blocksize);
ac27a0ec
DK		 3664 goto failed_mount;
3665 }
3666
2b2d6d01 3667 brelse(bh);
70bbb3e0
AM		 3668 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3669 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3670 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3671 if (!bh) {
b31e1552
ES		 3672 ext4_msg(sb, KERN_ERR,
3673 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3674 goto failed_mount;
3675 }
2716b802 3676 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3677 sbi->s_es = es;
617ba13b 3678 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3679 ext4_msg(sb, KERN_ERR,
3680 "Magic mismatch, very weird!");
ac27a0ec
DK		 3681 goto failed_mount;
3682 }
3683 }
3684
a13fb1a4
ES		 3685 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3686 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3687 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3688 has_huge_files);
3689 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3690
617ba13b
MC		 3691 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3692 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3693 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3694 } else {
3695 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3696 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3697 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3698 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3699 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3700 ext4_msg(sb, KERN_ERR,
3701 "unsupported inode size: %d",
2b2d6d01 3702 sbi->s_inode_size);
ac27a0ec
DK		 3703 goto failed_mount;
3704 }
ef7f3835
KS		 3705 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3706 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3707 }
0b8e58a1 3708
0d1ee42f
AR		 3709 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3710 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3711 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3712 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3713 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3714 ext4_msg(sb, KERN_ERR,
3715 "unsupported descriptor size %lu",
0d1ee42f
AR		 3716 sbi->s_desc_size);
3717 goto failed_mount;
3718 }
3719 } else
3720 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3721
ac27a0ec 3722 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3723 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3724 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3725 goto cantfind_ext4;
0b8e58a1 3726
617ba13b 3727 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3728 if (sbi->s_inodes_per_block == 0)
617ba13b 3729 goto cantfind_ext4;
ac27a0ec
DK		 3730 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3731 sbi->s_inodes_per_block;
0d1ee42f 3732 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3733 sbi->s_sbh = bh;
3734 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3735 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3736 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3737
2b2d6d01 3738 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3739 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3740 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3741 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3742 i = le32_to_cpu(es->s_flags);
3743 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3744 sbi->s_hash_unsigned = 3;
3745 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3746#ifdef __CHAR_UNSIGNED__
23301410
TT		 3747 if (!(sb->s_flags & MS_RDONLY))
3748 es->s_flags |=
3749 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3750 sbi->s_hash_unsigned = 3;
f99b2589 3751#else
23301410
TT		 3752 if (!(sb->s_flags & MS_RDONLY))
3753 es->s_flags |=
3754 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3755#endif
23301410 3756 }
f99b2589 3757 }
ac27a0ec 3758
281b5995
TT		 3759 /* Handle clustersize */
3760 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3761 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3762 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3763 if (has_bigalloc) {
3764 if (clustersize < blocksize) {
3765 ext4_msg(sb, KERN_ERR,
3766 "cluster size (%d) smaller than "
3767 "block size (%d)", clustersize, blocksize);
3768 goto failed_mount;
3769 }
3770 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3771 le32_to_cpu(es->s_log_block_size);
3772 sbi->s_clusters_per_group =
3773 le32_to_cpu(es->s_clusters_per_group);
3774 if (sbi->s_clusters_per_group > blocksize * 8) {
3775 ext4_msg(sb, KERN_ERR,
3776 "#clusters per group too big: %lu",
3777 sbi->s_clusters_per_group);
3778 goto failed_mount;
3779 }
3780 if (sbi->s_blocks_per_group !=
3781 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3782 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3783 "clusters per group (%lu) inconsistent",
3784 sbi->s_blocks_per_group,
3785 sbi->s_clusters_per_group);
3786 goto failed_mount;
3787 }
3788 } else {
3789 if (clustersize != blocksize) {
3790 ext4_warning(sb, "fragment/cluster size (%d) != "
3791 "block size (%d)", clustersize,
3792 blocksize);
3793 clustersize = blocksize;
3794 }
3795 if (sbi->s_blocks_per_group > blocksize * 8) {
3796 ext4_msg(sb, KERN_ERR,
3797 "#blocks per group too big: %lu",
3798 sbi->s_blocks_per_group);
3799 goto failed_mount;
3800 }
3801 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3802 sbi->s_cluster_bits = 0;
ac27a0ec 3803 }
281b5995
TT		 3804 sbi->s_cluster_ratio = clustersize / blocksize;
3805
ac27a0ec 3806 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3807 ext4_msg(sb, KERN_ERR,
3808 "#inodes per group too big: %lu",
2b2d6d01 3809 sbi->s_inodes_per_group);
ac27a0ec
DK		 3810 goto failed_mount;
3811 }
3812
960fd856
TT		 3813 /* Do we have standard group size of clustersize * 8 blocks ? */
3814 if (sbi->s_blocks_per_group == clustersize << 3)
3815 set_opt2(sb, STD_GROUP_SIZE);
3816
bf43d84b
ES		 3817 /*
3818 * Test whether we have more sectors than will fit in sector_t,
3819 * and whether the max offset is addressable by the page cache.
3820 */
5a9ae68a 3821 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3822 ext4_blocks_count(es));
5a9ae68a 3823 if (err) {
b31e1552 3824 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3825 " too large to mount safely on this system");
ac27a0ec 3826 if (sizeof(sector_t) < 8)
90c699a9 3827 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3828 goto failed_mount;
3829 }
3830
617ba13b
MC		 3831 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3832 goto cantfind_ext4;
e7c95593 3833
0f2ddca6
FTN		 3834 /* check blocks count against device size */
3835 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3836 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3837 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3838 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3839 ext4_blocks_count(es), blocks_count);
3840 goto failed_mount;
3841 }
3842
0b8e58a1
AD		 3843 /*
3844 * It makes no sense for the first data block to be beyond the end
3845 * of the filesystem.
3846 */
3847 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3848 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3849 "block %u is beyond end of filesystem (%llu)",
3850 le32_to_cpu(es->s_first_data_block),
3851 ext4_blocks_count(es));
e7c95593
ES		 3852 goto failed_mount;
3853 }
bd81d8ee
LV		 3854 blocks_count = (ext4_blocks_count(es) -
3855 le32_to_cpu(es->s_first_data_block) +
3856 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3857 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3858 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3859 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3860 "(block count %llu, first data block %u, "
b31e1552 3861 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3862 ext4_blocks_count(es),
3863 le32_to_cpu(es->s_first_data_block),
3864 EXT4_BLOCKS_PER_GROUP(sb));
3865 goto failed_mount;
3866 }
bd81d8ee 3867 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3868 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3869 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3870 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3871 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3872 sbi->s_group_desc = ext4_kvmalloc(db_count *
3873 sizeof(struct buffer_head *),
3874 GFP_KERNEL);
ac27a0ec 3875 if (sbi->s_group_desc == NULL) {
b31e1552 3876 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3877 ret = -ENOMEM;
ac27a0ec
DK		 3878 goto failed_mount;
3879 }
3880
9f6200bb
TT		 3881 if (ext4_proc_root)
3882 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3883
66acdcf4
TT		 3884 if (sbi->s_proc)
3885 proc_create_data("options", S_IRUGO, sbi->s_proc,
3886 &ext4_seq_options_fops, sb);
3887
705895b6 3888 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3889
3890 for (i = 0; i < db_count; i++) {
70bbb3e0 3891 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3892 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3893 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3894 ext4_msg(sb, KERN_ERR,
3895 "can't read group descriptor %d", i);
ac27a0ec
DK		 3896 db_count = i;
3897 goto failed_mount2;
3898 }
3899 }
bfff6873 3900 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3901 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
f9ae9cf5 3902 goto failed_mount2;
ac27a0ec 3903 }
772cb7c8 3904
f9ae9cf5 3905 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3906 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3907 spin_lock_init(&sbi->s_next_gen_lock);
3908
04496411
TM		 3909 init_timer(&sbi->s_err_report);
3910 sbi->s_err_report.function = print_daily_error_info;
3911 sbi->s_err_report.data = (unsigned long) sb;
3912
a75ae78f 3913 /* Register extent status tree shrinker */
eb68d0e2 3914 if (ext4_es_register_shrinker(sbi))
ce7e010a 3915 goto failed_mount3;
ce7e010a 3916
c9de560d 3917 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3918 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3919
f9ae9cf5
TT		 3920 /*
3921 * set up enough so that it can read an inode
3922 */
f6e63f90 3923 sb->s_op = &ext4_sops;
617ba13b
MC		 3924 sb->s_export_op = &ext4_export_ops;
3925 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3926#ifdef CONFIG_QUOTA
617ba13b 3927 sb->dq_op = &ext4_quota_operations;
262b4662 3928 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3929 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3930 else
3931 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3932#endif
f2fa2ffc
AK		 3933 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3934
ac27a0ec 3935 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3936 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3937
3938 sb->s_root = NULL;
3939
3940 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3941 EXT4_HAS_INCOMPAT_FEATURE(sb,
3942 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3943
c5e06d10
JL		 3944 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3945 !(sb->s_flags & MS_RDONLY))
3946 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3947 goto failed_mount3;
3948
ac27a0ec
DK		 3949 /*
3950 * The first inode we look at is the journal inode. Don't try
3951 * root first: it may be modified in the journal!
3952 */
3953 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3954 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3955 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3956 goto failed_mount3;
0390131b
FM		 3957 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3958 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3959 ext4_msg(sb, KERN_ERR, "required journal recovery "
3960 "suppressed and not mounted read-only");
744692dc 3961 goto failed_mount_wq;
ac27a0ec 3962 } else {
fd8c37ec 3963 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3964 sbi->s_journal = NULL;
3965 needs_recovery = 0;
3966 goto no_journal;
ac27a0ec
DK		 3967 }
3968
f32aaf2d 3969 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3970 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3971 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3972 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3973 goto failed_mount_wq;
eb40a09c
JS		 3974 }
3975
25ed6e8a
DW		 3976 if (!set_journal_csum_feature_set(sb)) {
3977 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3978 "feature set");
3979 goto failed_mount_wq;
d4da6c9c 3980 }
818d276c 3981
ac27a0ec
DK		 3982 /* We have now updated the journal if required, so we can
3983 * validate the data journaling mode. */
3984 switch (test_opt(sb, DATA_FLAGS)) {
3985 case 0:
3986 /* No mode set, assume a default based on the journal
63f57933
AM		 3987 * capabilities: ORDERED_DATA if the journal can
3988 * cope, else JOURNAL_DATA
3989 */
dab291af
MC		 3990 if (jbd2_journal_check_available_features
3991 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3992 set_opt(sb, ORDERED_DATA);
ac27a0ec 3993 else
fd8c37ec 3994 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3995 break;
3996
617ba13b
MC		 3997 case EXT4_MOUNT_ORDERED_DATA:
3998 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3999 if (!jbd2_journal_check_available_features
4000 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4001 ext4_msg(sb, KERN_ERR, "Journal does not support "
4002 "requested data journaling mode");
744692dc 4003 goto failed_mount_wq;
ac27a0ec
DK		 4004 }
4005 default:
4006 break;
4007 }
b3881f74 4008 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4009
18aadd47
BJ		 4010 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4011
ce7e010a 4012no_journal:
9c191f70
M		 4013 if (ext4_mballoc_ready) {
4014 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4015 if (!sbi->s_mb_cache) {
4016 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4017 goto failed_mount_wq;
4018 }
4019 }
4020
952fc18e
TT		 4021 /*
4022 * Get the # of file system overhead blocks from the
4023 * superblock if present.
4024 */
4025 if (es->s_overhead_clusters)
4026 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4027 else {
07aa2ea1
LC		 4028 err = ext4_calculate_overhead(sb);
4029 if (err)
952fc18e
TT		 4030 goto failed_mount_wq;
4031 }
4032
fd89d5f2
TH		 4033 /*
4034 * The maximum number of concurrent works can be high and
4035 * concurrency isn't really necessary. Limit it to 1.
4036 */
2e8fa54e
JK		 4037 EXT4_SB(sb)->rsv_conversion_wq =
4038 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4039 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4040 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4041 ret = -ENOMEM;
2e8fa54e
JK		 4042 goto failed_mount4;
4043 }
4044
ac27a0ec 4045 /*
dab291af 4046 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4047 * so we can safely mount the rest of the filesystem now.
4048 */
4049
1d1fe1ee
DH		 4050 root = ext4_iget(sb, EXT4_ROOT_INO);
4051 if (IS_ERR(root)) {
b31e1552 4052 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4053 ret = PTR_ERR(root);
32a9bb57 4054 root = NULL;
ac27a0ec
DK		 4055 goto failed_mount4;
4056 }
4057 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4058 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4059 iput(root);
ac27a0ec
DK		 4060 goto failed_mount4;
4061 }
48fde701 4062 sb->s_root = d_make_root(root);
1d1fe1ee 4063 if (!sb->s_root) {
b31e1552 4064 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4065 ret = -ENOMEM;
4066 goto failed_mount4;
4067 }
ac27a0ec 4068
7e84b621
ES		 4069 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4070 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4071
4072 /* determine the minimum size of new large inodes, if present */
4073 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4074 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4075 EXT4_GOOD_OLD_INODE_SIZE;
4076 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4077 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4078 if (sbi->s_want_extra_isize <
4079 le16_to_cpu(es->s_want_extra_isize))
4080 sbi->s_want_extra_isize =
4081 le16_to_cpu(es->s_want_extra_isize);
4082 if (sbi->s_want_extra_isize <
4083 le16_to_cpu(es->s_min_extra_isize))
4084 sbi->s_want_extra_isize =
4085 le16_to_cpu(es->s_min_extra_isize);
4086 }
4087 }
4088 /* Check if enough inode space is available */
4089 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4090 sbi->s_inode_size) {
4091 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4092 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4093 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4094 "available");
ef7f3835
KS		 4095 }
4096
30fac0f7 4097 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4098 if (err) {
4099 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4100 "reserved pool", ext4_calculate_resv_clusters(sb));
f9ae9cf5 4101 goto failed_mount4a;
27dd4385
LC		 4102 }
4103
6fd058f7
TT		 4104 err = ext4_setup_system_zone(sb);
4105 if (err) {
b31e1552 4106 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4107 "zone (%d)", err);
f9ae9cf5
TT		 4108 goto failed_mount4a;
4109 }
4110
4111 ext4_ext_init(sb);
4112 err = ext4_mb_init(sb);
4113 if (err) {
4114 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4115 err);
dcf2d804 4116 goto failed_mount5;
c2774d84
AK		 4117 }
4118
d5e03cbb
TT		 4119 block = ext4_count_free_clusters(sb);
4120 ext4_free_blocks_count_set(sbi->s_es,
4121 EXT4_C2B(sbi, block));
4122 err = percpu_counter_init(&sbi->s_freeclusters_counter, block);
4123 if (!err) {
4124 unsigned long freei = ext4_count_free_inodes(sb);
4125 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4126 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei);
4127 }
4128 if (!err)
4129 err = percpu_counter_init(&sbi->s_dirs_counter,
4130 ext4_count_dirs(sb));
4131 if (!err)
4132 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
4133 if (err) {
4134 ext4_msg(sb, KERN_ERR, "insufficient memory");
4135 goto failed_mount6;
4136 }
4137
4138 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
4139 if (!ext4_fill_flex_info(sb)) {
4140 ext4_msg(sb, KERN_ERR,
4141 "unable to initialize "
4142 "flex_bg meta info!");
4143 goto failed_mount6;
4144 }
4145
bfff6873
LC		 4146 err = ext4_register_li_request(sb, first_not_zeroed);
4147 if (err)
dcf2d804 4148 goto failed_mount6;
bfff6873 4149
3197ebdb
TT		 4150 sbi->s_kobj.kset = ext4_kset;
4151 init_completion(&sbi->s_kobj_unregister);
4152 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4153 "%s", sb->s_id);
dcf2d804
TM		 4154 if (err)
4155 goto failed_mount7;
3197ebdb 4156
9b2ff357
JK		 4157#ifdef CONFIG_QUOTA
4158 /* Enable quota usage during mount. */
4159 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4160 !(sb->s_flags & MS_RDONLY)) {
4161 err = ext4_enable_quotas(sb);
4162 if (err)
4163 goto failed_mount8;
4164 }
4165#endif /* CONFIG_QUOTA */
4166
617ba13b
MC		 4167 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4168 ext4_orphan_cleanup(sb, es);
4169 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4170 if (needs_recovery) {
b31e1552 4171 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4172 ext4_mark_recovery_complete(sb, es);
4173 }
4174 if (EXT4_SB(sb)->s_journal) {
4175 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4176 descr = " journalled data mode";
4177 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4178 descr = " ordered data mode";
4179 else
4180 descr = " writeback data mode";
4181 } else
4182 descr = "out journal";
4183
79add3a3
LC		 4184 if (test_opt(sb, DISCARD)) {
4185 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4186 if (!blk_queue_discard(q))
4187 ext4_msg(sb, KERN_WARNING,
4188 "mounting with \"discard\" option, but "
4189 "the device does not support discard");
4190 }
4191
d4c402d9 4192 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4193 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4194 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4195
66e61a9e
TT		 4196 if (es->s_error_count)
4197 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4198
efbed4dc
TT		 4199 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4200 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4201 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4202 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4203
d4c402d9 4204 kfree(orig_data);
ac27a0ec
DK		 4205 return 0;
4206
617ba13b 4207cantfind_ext4:
ac27a0ec 4208 if (!silent)
b31e1552 4209 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4210 goto failed_mount;
4211
72ba7450
TT		 4212#ifdef CONFIG_QUOTA
4213failed_mount8:
4214 kobject_del(&sbi->s_kobj);
4215#endif
dcf2d804
TM		 4216failed_mount7:
4217 ext4_unregister_li_request(sb);
4218failed_mount6:
f9ae9cf5 4219 ext4_mb_release(sb);
d5e03cbb
TT		 4220 if (sbi->s_flex_groups)
4221 ext4_kvfree(sbi->s_flex_groups);
4222 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4223 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4224 percpu_counter_destroy(&sbi->s_dirs_counter);
4225 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4226failed_mount5:
f9ae9cf5
TT		 4227 ext4_ext_release(sb);
4228 ext4_release_system_zone(sb);
4229failed_mount4a:
94bf608a 4230 dput(sb->s_root);
32a9bb57 4231 sb->s_root = NULL;
94bf608a 4232failed_mount4:
b31e1552 4233 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4234 if (EXT4_SB(sb)->rsv_conversion_wq)
4235 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4236failed_mount_wq:
0390131b
FM		 4237 if (sbi->s_journal) {
4238 jbd2_journal_destroy(sbi->s_journal);
4239 sbi->s_journal = NULL;
4240 }
d3922a77 4241 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4242failed_mount3:
9105bb14 4243 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4244 if (sbi->s_mmp_tsk)
4245 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4246failed_mount2:
4247 for (i = 0; i < db_count; i++)
4248 brelse(sbi->s_group_desc[i]);
f18a5f21 4249 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4250failed_mount:
0441984a
DW		 4251 if (sbi->s_chksum_driver)
4252 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4253 if (sbi->s_proc) {
66acdcf4 4254 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4255 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4256 }
ac27a0ec 4257#ifdef CONFIG_QUOTA
a2d4a646 4258 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4259 kfree(sbi->s_qf_names[i]);
4260#endif
617ba13b 4261 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4262 brelse(bh);
4263out_fail:
4264 sb->s_fs_info = NULL;
f6830165 4265 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4266 kfree(sbi);
dcc7dae3 4267out_free_orig:
d4c402d9 4268 kfree(orig_data);
07aa2ea1 4269 return err ? err : ret;
ac27a0ec
DK		 4270}
4271
4272/*
4273 * Setup any per-fs journal parameters now. We'll do this both on
4274 * initial mount, once the journal has been initialised but before we've
4275 * done any recovery; and again on any subsequent remount.
4276 */
617ba13b 4277static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4278{
617ba13b 4279 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4280
30773840
TT		 4281 journal->j_commit_interval = sbi->s_commit_interval;
4282 journal->j_min_batch_time = sbi->s_min_batch_time;
4283 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4284
a931da6a 4285 write_lock(&journal->j_state_lock);
ac27a0ec 4286 if (test_opt(sb, BARRIER))
dab291af 4287 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4288 else
dab291af 4289 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4290 if (test_opt(sb, DATA_ERR_ABORT))
4291 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4292 else
4293 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4294 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4295}
4296
617ba13b 4297static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4298 unsigned int journal_inum)
4299{
4300 struct inode *journal_inode;
4301 journal_t *journal;
4302
0390131b
FM		 4303 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4304
ac27a0ec
DK		 4305 /* First, test for the existence of a valid inode on disk. Bad
4306 * things happen if we iget() an unused inode, as the subsequent
4307 * iput() will try to delete it. */
4308
1d1fe1ee
DH		 4309 journal_inode = ext4_iget(sb, journal_inum);
4310 if (IS_ERR(journal_inode)) {
b31e1552 4311 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4312 return NULL;
4313 }
4314 if (!journal_inode->i_nlink) {
4315 make_bad_inode(journal_inode);
4316 iput(journal_inode);
b31e1552 4317 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4318 return NULL;
4319 }
4320
e5f8eab8 4321 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4322 journal_inode, journal_inode->i_size);
1d1fe1ee 4323 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4324 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4325 iput(journal_inode);
4326 return NULL;
4327 }
4328
dab291af 4329 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4330 if (!journal) {
b31e1552 4331 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4332 iput(journal_inode);
4333 return NULL;
4334 }
4335 journal->j_private = sb;
617ba13b 4336 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4337 return journal;
4338}
4339
617ba13b 4340static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4341 dev_t j_dev)
4342{
2b2d6d01 4343 struct buffer_head *bh;
ac27a0ec 4344 journal_t *journal;
617ba13b
MC		 4345 ext4_fsblk_t start;
4346 ext4_fsblk_t len;
ac27a0ec 4347 int hblock, blocksize;
617ba13b 4348 ext4_fsblk_t sb_block;
ac27a0ec 4349 unsigned long offset;
2b2d6d01 4350 struct ext4_super_block *es;
ac27a0ec
DK		 4351 struct block_device *bdev;
4352
0390131b
FM		 4353 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4354
b31e1552 4355 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4356 if (bdev == NULL)
4357 return NULL;
4358
ac27a0ec 4359 blocksize = sb->s_blocksize;
e1defc4f 4360 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4361 if (blocksize < hblock) {
b31e1552
ES		 4362 ext4_msg(sb, KERN_ERR,
4363 "blocksize too small for journal device");
ac27a0ec
DK		 4364 goto out_bdev;
4365 }
4366
617ba13b
MC		 4367 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4368 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4369 set_blocksize(bdev, blocksize);
4370 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4371 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4372 "external journal");
ac27a0ec
DK		 4373 goto out_bdev;
4374 }
4375
2716b802 4376 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4377 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4378 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4379 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4380 ext4_msg(sb, KERN_ERR, "external journal has "
4381 "bad superblock");
ac27a0ec
DK		 4382 brelse(bh);
4383 goto out_bdev;
4384 }
4385
df4763be
DW		 4386 if ((le32_to_cpu(es->s_feature_ro_compat) &
4387 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4388 es->s_checksum != ext4_superblock_csum(sb, es)) {
4389 ext4_msg(sb, KERN_ERR, "external journal has "
4390 "corrupt superblock");
4391 brelse(bh);
4392 goto out_bdev;
4393 }
4394
617ba13b 4395 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4396 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4397 brelse(bh);
4398 goto out_bdev;
4399 }
4400
bd81d8ee 4401 len = ext4_blocks_count(es);
ac27a0ec
DK		 4402 start = sb_block + 1;
4403 brelse(bh); /* we're done with the superblock */
4404
dab291af 4405 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4406 start, len, blocksize);
4407 if (!journal) {
b31e1552 4408 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4409 goto out_bdev;
4410 }
4411 journal->j_private = sb;
9f203507 4412 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4413 wait_on_buffer(journal->j_sb_buffer);
4414 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4415 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4416 goto out_journal;
4417 }
4418 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4419 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4420 "user (unsupported) - %d",
ac27a0ec
DK		 4421 be32_to_cpu(journal->j_superblock->s_nr_users));
4422 goto out_journal;
4423 }
617ba13b
MC		 4424 EXT4_SB(sb)->journal_bdev = bdev;
4425 ext4_init_journal_params(sb, journal);
ac27a0ec 4426 return journal;
0b8e58a1 4427
ac27a0ec 4428out_journal:
dab291af 4429 jbd2_journal_destroy(journal);
ac27a0ec 4430out_bdev:
617ba13b 4431 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4432 return NULL;
4433}
4434
617ba13b
MC		 4435static int ext4_load_journal(struct super_block *sb,
4436 struct ext4_super_block *es,
ac27a0ec
DK		 4437 unsigned long journal_devnum)
4438{
4439 journal_t *journal;
4440 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4441 dev_t journal_dev;
4442 int err = 0;
4443 int really_read_only;
4444
0390131b
FM		 4445 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4446
ac27a0ec
DK		 4447 if (journal_devnum &&
4448 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4449 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4450 "numbers have changed");
ac27a0ec
DK		 4451 journal_dev = new_decode_dev(journal_devnum);
4452 } else
4453 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4454
4455 really_read_only = bdev_read_only(sb->s_bdev);
4456
4457 /*
4458 * Are we loading a blank journal or performing recovery after a
4459 * crash? For recovery, we need to check in advance whether we
4460 * can get read-write access to the device.
4461 */
617ba13b 4462 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4463 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4464 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4465 "required on readonly filesystem");
ac27a0ec 4466 if (really_read_only) {
b31e1552
ES		 4467 ext4_msg(sb, KERN_ERR, "write access "
4468 "unavailable, cannot proceed");
ac27a0ec
DK		 4469 return -EROFS;
4470 }
b31e1552
ES		 4471 ext4_msg(sb, KERN_INFO, "write access will "
4472 "be enabled during recovery");
ac27a0ec
DK		 4473 }
4474 }
4475
4476 if (journal_inum && journal_dev) {
b31e1552
ES		 4477 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4478 "and inode journals!");
ac27a0ec
DK		 4479 return -EINVAL;
4480 }
4481
4482 if (journal_inum) {
617ba13b 4483 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4484 return -EINVAL;
4485 } else {
617ba13b 4486 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4487 return -EINVAL;
4488 }
4489
90576c0b 4490 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4491 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4492
617ba13b 4493 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4494 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4495 if (!err) {
4496 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4497 if (save)
4498 memcpy(save, ((char *) es) +
4499 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4500 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4501 if (save)
4502 memcpy(((char *) es) + EXT4_S_ERR_START,
4503 save, EXT4_S_ERR_LEN);
4504 kfree(save);
4505 }
ac27a0ec
DK		 4506
4507 if (err) {
b31e1552 4508 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4509 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4510 return err;
4511 }
4512
617ba13b
MC		 4513 EXT4_SB(sb)->s_journal = journal;
4514 ext4_clear_journal_err(sb, es);
ac27a0ec 4515
c41303ce 4516 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4517 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4518 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4519
4520 /* Make sure we flush the recovery flag to disk. */
e2d67052 4521 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4522 }
4523
4524 return 0;
4525}
4526
e2d67052 4527static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4528{
e2d67052 4529 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4530 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4531 int error = 0;
ac27a0ec 4532
7c2e7087 4533 if (!sbh || block_device_ejected(sb))
c4be0c1d 4534 return error;
914258bf
TT		 4535 if (buffer_write_io_error(sbh)) {
4536 /*
4537 * Oh, dear. A previous attempt to write the
4538 * superblock failed. This could happen because the
4539 * USB device was yanked out. Or it could happen to
4540 * be a transient write error and maybe the block will
4541 * be remapped. Nothing we can do but to retry the
4542 * write and hope for the best.
4543 */
b31e1552
ES		 4544 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4545 "superblock detected");
914258bf
TT		 4546 clear_buffer_write_io_error(sbh);
4547 set_buffer_uptodate(sbh);
4548 }
71290b36
TT		 4549 /*
4550 * If the file system is mounted read-only, don't update the
4551 * superblock write time. This avoids updating the superblock
4552 * write time when we are mounting the root file system
4553 * read/only but we need to replay the journal; at that point,
4554 * for people who are east of GMT and who make their clock
4555 * tick in localtime for Windows bug-for-bug compatibility,
4556 * the clock is set in the future, and this will cause e2fsck
4557 * to complain and force a full file system check.
4558 */
4559 if (!(sb->s_flags & MS_RDONLY))
4560 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4561 if (sb->s_bdev->bd_part)
4562 es->s_kbytes_written =
4563 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4564 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4565 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4566 else
4567 es->s_kbytes_written =
4568 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4569 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4570 ext4_free_blocks_count_set(es,
57042651
TT		 4571 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4572 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4573 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4574 es->s_free_inodes_count =
4575 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4576 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4577 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4578 ext4_superblock_csum_set(sb);
ac27a0ec 4579 mark_buffer_dirty(sbh);
914258bf 4580 if (sync) {
c4be0c1d
TS		 4581 error = sync_dirty_buffer(sbh);
4582 if (error)
4583 return error;
4584
4585 error = buffer_write_io_error(sbh);
4586 if (error) {
b31e1552
ES		 4587 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4588 "superblock");
914258bf
TT		 4589 clear_buffer_write_io_error(sbh);
4590 set_buffer_uptodate(sbh);
4591 }
4592 }
c4be0c1d 4593 return error;
ac27a0ec
DK		 4594}
4595
ac27a0ec
DK		 4596/*
4597 * Have we just finished recovery? If so, and if we are mounting (or
4598 * remounting) the filesystem readonly, then we will end up with a
4599 * consistent fs on disk. Record that fact.
4600 */
2b2d6d01
TT		 4601static void ext4_mark_recovery_complete(struct super_block *sb,
4602 struct ext4_super_block *es)
ac27a0ec 4603{
617ba13b 4604 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4605
0390131b
FM		 4606 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4607 BUG_ON(journal != NULL);
4608 return;
4609 }
dab291af 4610 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4611 if (jbd2_journal_flush(journal) < 0)
4612 goto out;
4613
617ba13b 4614 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4615 sb->s_flags & MS_RDONLY) {
617ba13b 4616 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4617 ext4_commit_super(sb, 1);
ac27a0ec 4618 }
7ffe1ea8
HK		 4619
4620out:
dab291af 4621 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4622}
4623
4624/*
4625 * If we are mounting (or read-write remounting) a filesystem whose journal
4626 * has recorded an error from a previous lifetime, move that error to the
4627 * main filesystem now.
4628 */
2b2d6d01
TT		 4629static void ext4_clear_journal_err(struct super_block *sb,
4630 struct ext4_super_block *es)
ac27a0ec
DK		 4631{
4632 journal_t *journal;
4633 int j_errno;
4634 const char *errstr;
4635
0390131b
FM		 4636 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4637
617ba13b 4638 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4639
4640 /*
4641 * Now check for any error status which may have been recorded in the
617ba13b 4642 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4643 */
4644
dab291af 4645 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4646 if (j_errno) {
4647 char nbuf[16];
4648
617ba13b 4649 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4650 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4651 "from previous mount: %s", errstr);
12062ddd 4652 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4653
617ba13b
MC		 4654 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4655 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4656 ext4_commit_super(sb, 1);
ac27a0ec 4657
dab291af 4658 jbd2_journal_clear_err(journal);
d796c52e 4659 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4660 }
4661}
4662
4663/*
4664 * Force the running and committing transactions to commit,
4665 * and wait on the commit.
4666 */
617ba13b 4667int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4668{
4669 journal_t *journal;
ac27a0ec
DK		 4670
4671 if (sb->s_flags & MS_RDONLY)
4672 return 0;
4673
617ba13b 4674 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4675 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4676}
4677
617ba13b 4678static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4679{
14ce0cb4 4680 int ret = 0;
9eddacf9 4681 tid_t target;
06a407f1 4682 bool needs_barrier = false;
8d5d02e6 4683 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4684
9bffad1e 4685 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4686 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4687 /*
4688 * Writeback quota in non-journalled quota case - journalled quota has
4689 * no dirty dquots
4690 */
4691 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4692 /*
4693 * Data writeback is possible w/o journal transaction, so barrier must
4694 * being sent at the end of the function. But we can skip it if
4695 * transaction_commit will do it for us.
4696 */
bda32530
TT		 4697 if (sbi->s_journal) {
4698 target = jbd2_get_latest_transaction(sbi->s_journal);
4699 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4700 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4701 needs_barrier = true;
4702
4703 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4704 if (wait)
4705 ret = jbd2_log_wait_commit(sbi->s_journal,
4706 target);
4707 }
4708 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4709 needs_barrier = true;
06a407f1
DM		 4710 if (needs_barrier) {
4711 int err;
4712 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4713 if (!ret)
4714 ret = err;
0390131b 4715 }
06a407f1 4716
14ce0cb4 4717 return ret;
ac27a0ec
DK		 4718}
4719
4720/*
4721 * LVM calls this function before a (read-only) snapshot is created. This
4722 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4723 *
4724 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4725 * state independently. It relies on upper layer to stop all data & metadata
4726 * modifications.
ac27a0ec 4727 */
c4be0c1d 4728static int ext4_freeze(struct super_block *sb)
ac27a0ec 4729{
c4be0c1d
TS		 4730 int error = 0;
4731 journal_t *journal;
ac27a0ec 4732
9ca92389
TT		 4733 if (sb->s_flags & MS_RDONLY)
4734 return 0;
ac27a0ec 4735
9ca92389 4736 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4737
bb044576
TT		 4738 if (journal) {
4739 /* Now we set up the journal barrier. */
4740 jbd2_journal_lock_updates(journal);
ac27a0ec 4741
bb044576
TT		 4742 /*
4743 * Don't clear the needs_recovery flag if we failed to
4744 * flush the journal.
4745 */
4746 error = jbd2_journal_flush(journal);
4747 if (error < 0)
4748 goto out;
4749 }
9ca92389
TT		 4750
4751 /* Journal blocked and flushed, clear needs_recovery flag. */
4752 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4753 error = ext4_commit_super(sb, 1);
6b0310fb 4754out:
bb044576
TT		 4755 if (journal)
4756 /* we rely on upper layer to stop further updates */
4757 jbd2_journal_unlock_updates(journal);
6b0310fb 4758 return error;
ac27a0ec
DK		 4759}
4760
4761/*
4762 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4763 * flag here, even though the filesystem is not technically dirty yet.
4764 */
c4be0c1d 4765static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4766{
9ca92389
TT		 4767 if (sb->s_flags & MS_RDONLY)
4768 return 0;
4769
9ca92389
TT		 4770 /* Reset the needs_recovery flag before the fs is unlocked. */
4771 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4772 ext4_commit_super(sb, 1);
c4be0c1d 4773 return 0;
ac27a0ec
DK		 4774}
4775
673c6100
TT		 4776/*
4777 * Structure to save mount options for ext4_remount's benefit
4778 */
4779struct ext4_mount_options {
4780 unsigned long s_mount_opt;
a2595b8a 4781 unsigned long s_mount_opt2;
08cefc7a
EB		 4782 kuid_t s_resuid;
4783 kgid_t s_resgid;
673c6100
TT		 4784 unsigned long s_commit_interval;
4785 u32 s_min_batch_time, s_max_batch_time;
4786#ifdef CONFIG_QUOTA
4787 int s_jquota_fmt;
a2d4a646 4788 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4789#endif
4790};
4791
2b2d6d01 4792static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4793{
2b2d6d01 4794 struct ext4_super_block *es;
617ba13b 4795 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4796 unsigned long old_sb_flags;
617ba13b 4797 struct ext4_mount_options old_opts;
c79d967d 4798 int enable_quota = 0;
8a266467 4799 ext4_group_t g;
b3881f74 4800 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4801 int err = 0;
ac27a0ec 4802#ifdef CONFIG_QUOTA
03dafb5f 4803 int i, j;
ac27a0ec 4804#endif
d4c402d9 4805 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4806
4807 /* Store the original options */
4808 old_sb_flags = sb->s_flags;
4809 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4810 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4811 old_opts.s_resuid = sbi->s_resuid;
4812 old_opts.s_resgid = sbi->s_resgid;
4813 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4814 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4815 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4816#ifdef CONFIG_QUOTA
4817 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4818 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4819 if (sbi->s_qf_names[i]) {
4820 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4821 GFP_KERNEL);
4822 if (!old_opts.s_qf_names[i]) {
4823 for (j = 0; j < i; j++)
4824 kfree(old_opts.s_qf_names[j]);
3e36a163 4825 kfree(orig_data);
03dafb5f
CG		 4826 return -ENOMEM;
4827 }
4828 } else
4829 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4830#endif
b3881f74
TT		 4831 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4832 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4833
4834 /*
4835 * Allow the "check" option to be passed as a remount option.
4836 */
661aa520 4837 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4838 err = -EINVAL;
4839 goto restore_opts;
4840 }
4841
6ae6514b
PS		 4842 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4843 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4844 ext4_msg(sb, KERN_ERR, "can't mount with "
4845 "both data=journal and delalloc");
4846 err = -EINVAL;
4847 goto restore_opts;
4848 }
4849 if (test_opt(sb, DIOREAD_NOLOCK)) {
4850 ext4_msg(sb, KERN_ERR, "can't mount with "
4851 "both data=journal and dioread_nolock");
4852 err = -EINVAL;
4853 goto restore_opts;
4854 }
4855 }
4856
4ab2f15b 4857 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4858 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4859
4860 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4861 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4862
4863 es = sbi->s_es;
4864
b3881f74 4865 if (sbi->s_journal) {
0390131b 4866 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4867 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4868 }
ac27a0ec 4869
661aa520 4870 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4871 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4872 err = -EROFS;
4873 goto restore_opts;
4874 }
4875
4876 if (*flags & MS_RDONLY) {
38c03b34
TT		 4877 err = sync_filesystem(sb);
4878 if (err < 0)
4879 goto restore_opts;
0f0dd62f
CH		 4880 err = dquot_suspend(sb, -1);
4881 if (err < 0)
c79d967d 4882 goto restore_opts;
c79d967d 4883
ac27a0ec
DK		 4884 /*
4885 * First of all, the unconditional stuff we have to do
4886 * to disable replay of the journal when we next remount
4887 */
4888 sb->s_flags |= MS_RDONLY;
4889
4890 /*
4891 * OK, test if we are remounting a valid rw partition
4892 * readonly, and if so set the rdonly flag and then
4893 * mark the partition as valid again.
4894 */
617ba13b
MC		 4895 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4896 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4897 es->s_state = cpu_to_le16(sbi->s_mount_state);
4898
a63c9eb2 4899 if (sbi->s_journal)
0390131b 4900 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4901 } else {
a13fb1a4
ES		 4902 /* Make sure we can mount this feature set readwrite */
4903 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4904 err = -EROFS;
4905 goto restore_opts;
4906 }
8a266467
TT		 4907 /*
4908 * Make sure the group descriptor checksums
0b8e58a1 4909 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4910 */
4911 for (g = 0; g < sbi->s_groups_count; g++) {
4912 struct ext4_group_desc *gdp =
4913 ext4_get_group_desc(sb, g, NULL);
4914
feb0ab32 4915 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4916 ext4_msg(sb, KERN_ERR,
4917 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4918 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4919 le16_to_cpu(gdp->bg_checksum));
4920 err = -EINVAL;
4921 goto restore_opts;
4922 }
4923 }
4924
ead6596b
ES		 4925 /*
4926 * If we have an unprocessed orphan list hanging
4927 * around from a previously readonly bdev mount,
4928 * require a full umount/remount for now.
4929 */
4930 if (es->s_last_orphan) {
b31e1552 4931 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4932 "remount RDWR because of unprocessed "
4933 "orphan inode list. Please "
b31e1552 4934 "umount/remount instead");
ead6596b
ES		 4935 err = -EINVAL;
4936 goto restore_opts;
4937 }
4938
ac27a0ec
DK		 4939 /*
4940 * Mounting a RDONLY partition read-write, so reread
4941 * and store the current valid flag. (It may have
4942 * been changed by e2fsck since we originally mounted
4943 * the partition.)
4944 */
0390131b
FM		 4945 if (sbi->s_journal)
4946 ext4_clear_journal_err(sb, es);
ac27a0ec 4947 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4948 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4949 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4950 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4951 EXT4_FEATURE_INCOMPAT_MMP))
4952 if (ext4_multi_mount_protect(sb,
4953 le64_to_cpu(es->s_mmp_block))) {
4954 err = -EROFS;
4955 goto restore_opts;
4956 }
c79d967d 4957 enable_quota = 1;
ac27a0ec
DK		 4958 }
4959 }
bfff6873
LC		 4960
4961 /*
4962 * Reinitialize lazy itable initialization thread based on
4963 * current settings
4964 */
4965 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4966 ext4_unregister_li_request(sb);
4967 else {
4968 ext4_group_t first_not_zeroed;
4969 first_not_zeroed = ext4_has_uninit_itable(sb);
4970 ext4_register_li_request(sb, first_not_zeroed);
4971 }
4972
6fd058f7 4973 ext4_setup_system_zone(sb);
d096ad0f 4974 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4975 ext4_commit_super(sb, 1);
0390131b 4976
ac27a0ec
DK		 4977#ifdef CONFIG_QUOTA
4978 /* Release old quota file names */
a2d4a646 4979 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4980 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4981 if (enable_quota) {
4982 if (sb_any_quota_suspended(sb))
4983 dquot_resume(sb, -1);
4984 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4985 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4986 err = ext4_enable_quotas(sb);
07724f98 4987 if (err)
7c319d32 4988 goto restore_opts;
7c319d32
AK		 4989 }
4990 }
ac27a0ec 4991#endif
d4c402d9
CW		 4992
4993 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4994 kfree(orig_data);
ac27a0ec 4995 return 0;
0b8e58a1 4996
ac27a0ec
DK		 4997restore_opts:
4998 sb->s_flags = old_sb_flags;
4999 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5000 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5001 sbi->s_resuid = old_opts.s_resuid;
5002 sbi->s_resgid = old_opts.s_resgid;
5003 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5004 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5005 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5006#ifdef CONFIG_QUOTA
5007 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5008 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5009 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5010 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5011 }
5012#endif
d4c402d9 5013 kfree(orig_data);
ac27a0ec
DK		 5014 return err;
5015}
5016
2b2d6d01 5017static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5018{
5019 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5020 struct ext4_sb_info *sbi = EXT4_SB(sb);
5021 struct ext4_super_block *es = sbi->s_es;
27dd4385 5022 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5023 u64 fsid;
d02a9391 5024 s64 bfree;
27dd4385 5025 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5026
952fc18e
TT		 5027 if (!test_opt(sb, MINIX_DF))
5028 overhead = sbi->s_overhead;
ac27a0ec 5029
617ba13b 5030 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5031 buf->f_bsize = sb->s_blocksize;
b72f78cb 5032 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5033 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5034 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5035 /* prevent underflow in case that few free space is available */
57042651 5036 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5037 buf->f_bavail = buf->f_bfree -
5038 (ext4_r_blocks_count(es) + resv_blocks);
5039 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5040 buf->f_bavail = 0;
5041 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5042 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5043 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5044 fsid = le64_to_cpup((void *)es->s_uuid) ^
5045 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5046 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5047 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5048
ac27a0ec
DK		 5049 return 0;
5050}
5051
0b8e58a1
AD		 5052/* Helper function for writing quotas on sync - we need to start transaction
5053 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5054 * Process 1 Process 2
617ba13b 5055 * ext4_create() quota_sync()
a269eb18 5056 * jbd2_journal_start() write_dquot()
871a2931 5057 * dquot_initialize() down(dqio_mutex)
dab291af 5058 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5059 *
5060 */
5061
5062#ifdef CONFIG_QUOTA
5063
5064static inline struct inode *dquot_to_inode(struct dquot *dquot)
5065{
4c376dca 5066 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5067}
5068
617ba13b 5069static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5070{
5071 int ret, err;
5072 handle_t *handle;
5073 struct inode *inode;
5074
5075 inode = dquot_to_inode(dquot);
9924a92a 5076 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5077 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5078 if (IS_ERR(handle))
5079 return PTR_ERR(handle);
5080 ret = dquot_commit(dquot);
617ba13b 5081 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5082 if (!ret)
5083 ret = err;
5084 return ret;
5085}
5086
617ba13b 5087static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5088{
5089 int ret, err;
5090 handle_t *handle;
5091
9924a92a 5092 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5093 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5094 if (IS_ERR(handle))
5095 return PTR_ERR(handle);
5096 ret = dquot_acquire(dquot);
617ba13b 5097 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5098 if (!ret)
5099 ret = err;
5100 return ret;
5101}
5102
617ba13b 5103static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5104{
5105 int ret, err;
5106 handle_t *handle;
5107
9924a92a 5108 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5109 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5110 if (IS_ERR(handle)) {
5111 /* Release dquot anyway to avoid endless cycle in dqput() */
5112 dquot_release(dquot);
ac27a0ec 5113 return PTR_ERR(handle);
9c3013e9 5114 }
ac27a0ec 5115 ret = dquot_release(dquot);
617ba13b 5116 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5117 if (!ret)
5118 ret = err;
5119 return ret;
5120}
5121
617ba13b 5122static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5123{
262b4662
JK		 5124 struct super_block *sb = dquot->dq_sb;
5125 struct ext4_sb_info *sbi = EXT4_SB(sb);
5126
2c8be6b2 5127 /* Are we journaling quotas? */
262b4662
JK		 5128 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5129 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5130 dquot_mark_dquot_dirty(dquot);
617ba13b 5131 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5132 } else {
5133 return dquot_mark_dquot_dirty(dquot);
5134 }
5135}
5136
617ba13b 5137static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5138{
5139 int ret, err;
5140 handle_t *handle;
5141
5142 /* Data block + inode block */
9924a92a 5143 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5144 if (IS_ERR(handle))
5145 return PTR_ERR(handle);
5146 ret = dquot_commit_info(sb, type);
617ba13b 5147 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5148 if (!ret)
5149 ret = err;
5150 return ret;
5151}
5152
5153/*
5154 * Turn on quotas during mount time - we need to find
5155 * the quota file and such...
5156 */
617ba13b 5157static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5158{
287a8095
CH		 5159 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5160 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5161}
5162
5163/*
5164 * Standard function to be called on quota_on
5165 */
617ba13b 5166static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5167 struct path *path)
ac27a0ec
DK		 5168{
5169 int err;
ac27a0ec
DK		 5170
5171 if (!test_opt(sb, QUOTA))
5172 return -EINVAL;
0623543b 5173
ac27a0ec 5174 /* Quotafile not on the same filesystem? */
d8c9584e 5175 if (path->dentry->d_sb != sb)
ac27a0ec 5176 return -EXDEV;
0623543b
JK		 5177 /* Journaling quota? */
5178 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5179 /* Quotafile not in fs root? */
f00c9e44 5180 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5181 ext4_msg(sb, KERN_WARNING,
5182 "Quota file not on filesystem root. "
5183 "Journaled quota will not work");
2b2d6d01 5184 }
0623543b
JK		 5185
5186 /*
5187 * When we journal data on quota file, we have to flush journal to see
5188 * all updates to the file when we bypass pagecache...
5189 */
0390131b 5190 if (EXT4_SB(sb)->s_journal &&
f00c9e44 5191 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 5192 /*
5193 * We don't need to lock updates but journal_flush() could
5194 * otherwise be livelocked...
5195 */
5196 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5197 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5198 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5199 if (err)
7ffe1ea8 5200 return err;
0623543b
JK		 5201 }
5202
f00c9e44 5203 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5204}
5205
7c319d32
AK		 5206static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5207 unsigned int flags)
5208{
5209 int err;
5210 struct inode *qf_inode;
a2d4a646 5211 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5212 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5213 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5214 };
5215
5216 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5217
5218 if (!qf_inums[type])
5219 return -EPERM;
5220
5221 qf_inode = ext4_iget(sb, qf_inums[type]);
5222 if (IS_ERR(qf_inode)) {
5223 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5224 return PTR_ERR(qf_inode);
5225 }
5226
bcb13850
JK		 5227 /* Don't account quota for quota files to avoid recursion */
5228 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5229 err = dquot_enable(qf_inode, type, format_id, flags);
5230 iput(qf_inode);
5231
5232 return err;
5233}
5234
5235/* Enable usage tracking for all quota types. */
5236static int ext4_enable_quotas(struct super_block *sb)
5237{
5238 int type, err = 0;
a2d4a646 5239 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5240 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5241 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5242 };
5243
5244 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5245 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5246 if (qf_inums[type]) {
5247 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5248 DQUOT_USAGE_ENABLED);
5249 if (err) {
5250 ext4_warning(sb,
72ba7450
TT		 5251 "Failed to enable quota tracking "
5252 "(type=%d, err=%d). Please run "
5253 "e2fsck to fix.", type, err);
7c319d32
AK		 5254 return err;
5255 }
5256 }
5257 }
5258 return 0;
5259}
5260
5261/*
5262 * quota_on function that is used when QUOTA feature is set.
5263 */
5264static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5265 int format_id)
5266{
5267 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5268 return -EINVAL;
5269
5270 /*
5271 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5272 */
5273 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5274}
5275
ca0e05e4
DM		 5276static int ext4_quota_off(struct super_block *sb, int type)
5277{
21f97697
JK		 5278 struct inode *inode = sb_dqopt(sb)->files[type];
5279 handle_t *handle;
5280
87009d86
DM		 5281 /* Force all delayed allocation blocks to be allocated.
5282 * Caller already holds s_umount sem */
5283 if (test_opt(sb, DELALLOC))
ca0e05e4 5284 sync_filesystem(sb);
ca0e05e4 5285
0b268590
AG		 5286 if (!inode)
5287 goto out;
5288
21f97697
JK		 5289 /* Update modification times of quota files when userspace can
5290 * start looking at them */
9924a92a 5291 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5292 if (IS_ERR(handle))
5293 goto out;
5294 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5295 ext4_mark_inode_dirty(handle, inode);
5296 ext4_journal_stop(handle);
5297
5298out:
ca0e05e4
DM		 5299 return dquot_quota_off(sb, type);
5300}
5301
7c319d32
AK		 5302/*
5303 * quota_off function that is used when QUOTA feature is set.
5304 */
5305static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5306{
5307 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5308 return -EINVAL;
5309
5310 /* Disable only the limits. */
5311 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5312}
5313
ac27a0ec
DK		 5314/* Read data from quotafile - avoid pagecache and such because we cannot afford
5315 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5316 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5317 * we don't have to be afraid of races */
617ba13b 5318static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5319 size_t len, loff_t off)
5320{
5321 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5322 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5323 int offset = off & (sb->s_blocksize - 1);
5324 int tocopy;
5325 size_t toread;
5326 struct buffer_head *bh;
5327 loff_t i_size = i_size_read(inode);
5328
5329 if (off > i_size)
5330 return 0;
5331 if (off+len > i_size)
5332 len = i_size-off;
5333 toread = len;
5334 while (toread > 0) {
5335 tocopy = sb->s_blocksize - offset < toread ?
5336 sb->s_blocksize - offset : toread;
1c215028
TT		 5337 bh = ext4_bread(NULL, inode, blk, 0);
5338 if (IS_ERR(bh))
5339 return PTR_ERR(bh);
ac27a0ec
DK		 5340 if (!bh) /* A hole? */
5341 memset(data, 0, tocopy);
5342 else
5343 memcpy(data, bh->b_data+offset, tocopy);
5344 brelse(bh);
5345 offset = 0;
5346 toread -= tocopy;
5347 data += tocopy;
5348 blk++;
5349 }
5350 return len;
5351}
5352
5353/* Write to quotafile (we know the transaction is already started and has
5354 * enough credits) */
617ba13b 5355static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5356 const char *data, size_t len, loff_t off)
5357{
5358 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5359 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5360 int err, offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5361 struct buffer_head *bh;
5362 handle_t *handle = journal_current_handle();
5363
0390131b 5364 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5365 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5366 " cancelled because transaction is not started",
9c3013e9
JK		 5367 (unsigned long long)off, (unsigned long long)len);
5368 return -EIO;
5369 }
67eeb568
DM		 5370 /*
5371 * Since we account only one data block in transaction credits,
5372 * then it is impossible to cross a block boundary.
5373 */
5374 if (sb->s_blocksize - offset < len) {
5375 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5376 " cancelled because not block aligned",
5377 (unsigned long long)off, (unsigned long long)len);
5378 return -EIO;
5379 }
5380
1c215028
TT		 5381 bh = ext4_bread(handle, inode, blk, 1);
5382 if (IS_ERR(bh))
5383 return PTR_ERR(bh);
67eeb568
DM		 5384 if (!bh)
5385 goto out;
5d601255 5386 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5387 err = ext4_journal_get_write_access(handle, bh);
5388 if (err) {
5389 brelse(bh);
1c215028 5390 return err;
ac27a0ec 5391 }
67eeb568
DM		 5392 lock_buffer(bh);
5393 memcpy(bh->b_data+offset, data, len);
5394 flush_dcache_page(bh->b_page);
5395 unlock_buffer(bh);
62d2b5f2 5396 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5397 brelse(bh);
ac27a0ec 5398out:
67eeb568
DM		 5399 if (inode->i_size < off + len) {
5400 i_size_write(inode, off + len);
617ba13b 5401 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5402 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5403 }
67eeb568 5404 return len;
ac27a0ec
DK		 5405}
5406
5407#endif
5408
152a0836
AV		 5409static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5410 const char *dev_name, void *data)
ac27a0ec 5411{
152a0836 5412 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5413}
5414
37f328eb 5415#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5416static inline void register_as_ext2(void)
5417{
5418 int err = register_filesystem(&ext2_fs_type);
5419 if (err)
5420 printk(KERN_WARNING
5421 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5422}
5423
5424static inline void unregister_as_ext2(void)
5425{
5426 unregister_filesystem(&ext2_fs_type);
5427}
2035e776
TT		 5428
5429static inline int ext2_feature_set_ok(struct super_block *sb)
5430{
5431 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5432 return 0;
5433 if (sb->s_flags & MS_RDONLY)
5434 return 1;
5435 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5436 return 0;
5437 return 1;
5438}
24b58424
TT		 5439#else
5440static inline void register_as_ext2(void) { }
5441static inline void unregister_as_ext2(void) { }
2035e776 5442static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5443#endif
5444
37f328eb 5445#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5446static inline void register_as_ext3(void)
5447{
5448 int err = register_filesystem(&ext3_fs_type);
5449 if (err)
5450 printk(KERN_WARNING
5451 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5452}
5453
5454static inline void unregister_as_ext3(void)
5455{
5456 unregister_filesystem(&ext3_fs_type);
5457}
2035e776
TT		 5458
5459static inline int ext3_feature_set_ok(struct super_block *sb)
5460{
5461 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5462 return 0;
5463 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5464 return 0;
5465 if (sb->s_flags & MS_RDONLY)
5466 return 1;
5467 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5468 return 0;
5469 return 1;
5470}
24b58424
TT		 5471#else
5472static inline void register_as_ext3(void) { }
5473static inline void unregister_as_ext3(void) { }
2035e776 5474static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5475#endif
5476
03010a33
TT		 5477static struct file_system_type ext4_fs_type = {
5478 .owner = THIS_MODULE,
5479 .name = "ext4",
152a0836 5480 .mount = ext4_mount,
03010a33
TT		 5481 .kill_sb = kill_block_super,
5482 .fs_flags = FS_REQUIRES_DEV,
5483};
7f78e035 5484MODULE_ALIAS_FS("ext4");
03010a33 5485
8f021222 5486static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5487{
5488 struct ext4_features *ef;
5489 int ret = -ENOMEM;
5490
5491 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5492 if (!ef)
5493 goto out;
5494
5495 ef->f_kobj.kset = ext4_kset;
5496 init_completion(&ef->f_kobj_unregister);
5497 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5498 "features");
5499 if (ret) {
5500 kfree(ef);
5501 goto out;
5502 }
5503
5504 ext4_feat = ef;
5505 ret = 0;
5506out:
5507 return ret;
5508}
5509
8f021222
LC		 5510static void ext4_exit_feat_adverts(void)
5511{
5512 kobject_put(&ext4_feat->f_kobj);
5513 wait_for_completion(&ext4_feat->f_kobj_unregister);
5514 kfree(ext4_feat);
5515}
5516
e9e3bcec
ES		 5517/* Shared across all ext4 file systems */
5518wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5519struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5520
5dabfc78 5521static int __init ext4_init_fs(void)
ac27a0ec 5522{
e9e3bcec 5523 int i, err;
c9de560d 5524
07c0c5d8
AV		 5525 ext4_li_info = NULL;
5526 mutex_init(&ext4_li_mtx);
5527
9a4c8019 5528 /* Build-time check for flags consistency */
12e9b892 5529 ext4_check_flag_values();
e9e3bcec
ES		 5530
5531 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5532 mutex_init(&ext4__aio_mutex[i]);
5533 init_waitqueue_head(&ext4__ioend_wq[i]);
5534 }
5535
51865fda 5536 err = ext4_init_es();
6fd058f7
TT		 5537 if (err)
5538 return err;
51865fda
ZL		 5539
5540 err = ext4_init_pageio();
5541 if (err)
5542 goto out7;
5543
5dabfc78 5544 err = ext4_init_system_zone();
bd2d0210 5545 if (err)
d44651d0 5546 goto out6;
3197ebdb 5547 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5548 if (!ext4_kset) {
5549 err = -ENOMEM;
dd68314c 5550 goto out5;
0e376b1e 5551 }
d44651d0 5552 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5553
5554 err = ext4_init_feat_adverts();
dd68314c
TT		 5555 if (err)
5556 goto out4;
857ac889 5557
5dabfc78 5558 err = ext4_init_mballoc();
c9de560d
AT		 5559 if (err)
5560 goto out2;
9c191f70
M		 5561 else
5562 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5563 err = init_inodecache();
5564 if (err)
5565 goto out1;
24b58424 5566 register_as_ext3();
2035e776 5567 register_as_ext2();
03010a33 5568 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5569 if (err)
5570 goto out;
bfff6873 5571
ac27a0ec
DK		 5572 return 0;
5573out:
24b58424
TT		 5574 unregister_as_ext2();
5575 unregister_as_ext3();
ac27a0ec
DK		 5576 destroy_inodecache();
5577out1:
9c191f70 5578 ext4_mballoc_ready = 0;
5dabfc78 5579 ext4_exit_mballoc();
9c191f70 5580out2:
8f021222 5581 ext4_exit_feat_adverts();
dd68314c 5582out4:
d44651d0
FJ		 5583 if (ext4_proc_root)
5584 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5585 kset_unregister(ext4_kset);
d44651d0 5586out5:
5dabfc78 5587 ext4_exit_system_zone();
d44651d0 5588out6:
5dabfc78 5589 ext4_exit_pageio();
51865fda
ZL		 5590out7:
5591 ext4_exit_es();
5592
ac27a0ec
DK		 5593 return err;
5594}
5595
5dabfc78 5596static void __exit ext4_exit_fs(void)
ac27a0ec 5597{
bfff6873 5598 ext4_destroy_lazyinit_thread();
24b58424
TT		 5599 unregister_as_ext2();
5600 unregister_as_ext3();
03010a33 5601 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5602 destroy_inodecache();
5dabfc78 5603 ext4_exit_mballoc();
8f021222 5604 ext4_exit_feat_adverts();
9f6200bb 5605 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5606 kset_unregister(ext4_kset);
5dabfc78
TT		 5607 ext4_exit_system_zone();
5608 ext4_exit_pageio();
dd12ed14 5609 ext4_exit_es();
ac27a0ec
DK		 5610}
5611
5612MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5613MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5614MODULE_LICENSE("GPL");
5dabfc78
TT		 5615module_init(ext4_init_fs)
5616module_exit(ext4_exit_fs)