super.c 158.4 KB
Newer Older
1
/*
2
 *  linux/fs/ext4/super.c
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
23
#include <linux/vmalloc.h>
24
#include <linux/jbd2.h>
25 26 27 28 29
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
30
#include <linux/exportfs.h>
31 32 33 34 35 36
#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
37
#include <linux/proc_fs.h>
T
Theodore Ts'o 已提交
38
#include <linux/ctype.h>
V
Vignesh Babu 已提交
39
#include <linux/log2.h>
A
Andreas Dilger 已提交
40
#include <linux/crc16.h>
D
Dan Magenheimer 已提交
41
#include <linux/cleancache.h>
42 43
#include <asm/uaccess.h>

44 45 46
#include <linux/kthread.h>
#include <linux/freezer.h>

47
#include "ext4.h"
48
#include "ext4_extents.h"	/* Needed for trace points definition */
49
#include "ext4_jbd2.h"
50 51
#include "xattr.h"
#include "acl.h"
52
#include "mballoc.h"
53

54 55 56
#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>

57
static struct proc_dir_entry *ext4_proc_root;
T
Theodore Ts'o 已提交
58
static struct kset *ext4_kset;
59 60 61
static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
static struct ext4_features *ext4_feat;
62
static int ext4_mballoc_ready;
63

64
static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
65
			     unsigned long journal_devnum);
66
static int ext4_show_options(struct seq_file *seq, struct dentry *root);
67
static int ext4_commit_super(struct super_block *sb, int sync);
68 69 70 71
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
72
static int ext4_sync_fs(struct super_block *sb, int wait);
73
static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
74 75
static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 77
static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
A
Al Viro 已提交
78 79
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
80 81
static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
82
static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 84
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
85
static void ext4_clear_request_list(void);
L
Lukas Czerner 已提交
86
static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
87

88 89 90 91 92 93 94 95
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
96
MODULE_ALIAS_FS("ext2");
97
MODULE_ALIAS("ext2");
98 99 100 101 102 103
#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


104 105 106 107
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
A
Al Viro 已提交
108
	.mount		= ext4_mount,
109 110 111
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
112
MODULE_ALIAS_FS("ext3");
113
MODULE_ALIAS("ext3");
114 115 116 117
#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
#else
#define IS_EXT3_SB(sb) (0)
#endif
L
Laurent Vivier 已提交
118

119 120 121 122 123 124 125 126 127 128
static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return 1;

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

129 130 131 132 133 134 135 136 137 138 139 140
static __le32 ext4_superblock_csum(struct super_block *sb,
				   struct ext4_super_block *es)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int offset = offsetof(struct ext4_super_block, s_checksum);
	__u32 csum;

	csum = ext4_chksum(sbi, ~0, (char *)es, offset);

	return cpu_to_le32(csum);
}

141 142
static int ext4_superblock_csum_verify(struct super_block *sb,
				       struct ext4_super_block *es)
143 144 145 146 147 148 149 150
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return 1;

	return es->s_checksum == ext4_superblock_csum(sb, es);
}

151
void ext4_superblock_csum_set(struct super_block *sb)
152
{
153 154
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

155 156 157 158 159 160 161
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return;

	es->s_checksum = ext4_superblock_csum(sb, es);
}

162 163 164 165
void *ext4_kvmalloc(size_t size, gfp_t flags)
{
	void *ret;

166
	ret = kmalloc(size, flags | __GFP_NOWARN);
167 168 169 170 171 172 173 174 175
	if (!ret)
		ret = __vmalloc(size, flags, PAGE_KERNEL);
	return ret;
}

void *ext4_kvzalloc(size_t size, gfp_t flags)
{
	void *ret;

176
	ret = kzalloc(size, flags | __GFP_NOWARN);
177 178 179 180 181 182 183 184 185 186 187 188 189 190
	if (!ret)
		ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
	return ret;
}

void ext4_kvfree(void *ptr)
{
	if (is_vmalloc_addr(ptr))
		vfree(ptr);
	else
		kfree(ptr);

}

191 192
ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
L
Laurent Vivier 已提交
193
{
194
	return le32_to_cpu(bg->bg_block_bitmap_lo) |
195
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
196
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
L
Laurent Vivier 已提交
197 198
}

199 200
ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
L
Laurent Vivier 已提交
201
{
202
	return le32_to_cpu(bg->bg_inode_bitmap_lo) |
203
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
204
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
L
Laurent Vivier 已提交
205 206
}

207 208
ext4_fsblk_t ext4_inode_table(struct super_block *sb,
			      struct ext4_group_desc *bg)
L
Laurent Vivier 已提交
209
{
210
	return le32_to_cpu(bg->bg_inode_table_lo) |
211
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
212
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
L
Laurent Vivier 已提交
213 214
}

215 216
__u32 ext4_free_group_clusters(struct super_block *sb,
			       struct ext4_group_desc *bg)
217 218 219
{
	return le16_to_cpu(bg->bg_free_blocks_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
220
		 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
221 222 223 224 225 226 227
}

__u32 ext4_free_inodes_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_free_inodes_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
228
		 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
229 230 231 232 233 234 235
}

__u32 ext4_used_dirs_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_used_dirs_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
236
		 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
237 238 239 240 241 242 243
}

__u32 ext4_itable_unused_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_itable_unused_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
244
		 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
245 246
}

247 248
void ext4_block_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
L
Laurent Vivier 已提交
249
{
250
	bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
251 252
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
L
Laurent Vivier 已提交
253 254
}

255 256
void ext4_inode_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
L
Laurent Vivier 已提交
257
{
258
	bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
259 260
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
L
Laurent Vivier 已提交
261 262
}

263 264
void ext4_inode_table_set(struct super_block *sb,
			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
L
Laurent Vivier 已提交
265
{
266
	bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
267 268
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
L
Laurent Vivier 已提交
269 270
}

271 272
void ext4_free_group_clusters_set(struct super_block *sb,
				  struct ext4_group_desc *bg, __u32 count)
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302
{
	bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
}

void ext4_free_inodes_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
}

void ext4_used_dirs_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
}

void ext4_itable_unused_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
}

303

304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321
static void __save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
	es->s_last_error_time = cpu_to_le32(get_seconds());
	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
	es->s_last_error_line = cpu_to_le32(line);
	if (!es->s_first_error_time) {
		es->s_first_error_time = es->s_last_error_time;
		strncpy(es->s_first_error_func, func,
			sizeof(es->s_first_error_func));
		es->s_first_error_line = cpu_to_le32(line);
		es->s_first_error_ino = es->s_last_error_ino;
		es->s_first_error_block = es->s_last_error_block;
	}
322 323 324 325 326 327
	/*
	 * Start the daily error reporting function if it hasn't been
	 * started already
	 */
	if (!es->s_error_count)
		mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
328
	le32_add_cpu(&es->s_error_count, 1);
329 330 331 332 333 334 335 336 337
}

static void save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	__save_error_info(sb, func, line);
	ext4_commit_super(sb, 1);
}

338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353
/*
 * The del_gendisk() function uninitializes the disk-specific data
 * structures, including the bdi structure, without telling anyone
 * else.  Once this happens, any attempt to call mark_buffer_dirty()
 * (for example, by ext4_commit_super), will cause a kernel OOPS.
 * This is a kludge to prevent these oops until we can put in a proper
 * hook in del_gendisk() to inform the VFS and file system layers.
 */
static int block_device_ejected(struct super_block *sb)
{
	struct inode *bd_inode = sb->s_bdev->bd_inode;
	struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;

	return bdi->dev == NULL;
}

B
Bobi Jam 已提交
354 355 356 357 358
static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
{
	struct super_block		*sb = journal->j_private;
	struct ext4_sb_info		*sbi = EXT4_SB(sb);
	int				error = is_journal_aborted(journal);
359
	struct ext4_journal_cb_entry	*jce;
B
Bobi Jam 已提交
360

361
	BUG_ON(txn->t_state == T_FINISHED);
B
Bobi Jam 已提交
362
	spin_lock(&sbi->s_md_lock);
363 364 365
	while (!list_empty(&txn->t_private_list)) {
		jce = list_entry(txn->t_private_list.next,
				 struct ext4_journal_cb_entry, jce_list);
B
Bobi Jam 已提交
366 367 368 369 370 371 372
		list_del_init(&jce->jce_list);
		spin_unlock(&sbi->s_md_lock);
		jce->jce_func(sb, jce, error);
		spin_lock(&sbi->s_md_lock);
	}
	spin_unlock(&sbi->s_md_lock);
}
373

374 375 376 377
/* Deal with the reporting of failure conditions on a filesystem such as
 * inconsistencies detected or read IO failures.
 *
 * On ext2, we can store the error state of the filesystem in the
378
 * superblock.  That is not possible on ext4, because we may have other
379 380 381 382 383
 * write ordering constraints on the superblock which prevent us from
 * writing it out straight away; and given that the journal is about to
 * be aborted, we can't rely on the current, or future, transactions to
 * write out the superblock safely.
 *
384
 * We'll just use the jbd2_journal_abort() error code to record an error in
385
 * the journal instead.  On recovery, the journal will complain about
386 387 388
 * that error until we've noted it down and cleared it.
 */

389
static void ext4_handle_error(struct super_block *sb)
390 391 392 393
{
	if (sb->s_flags & MS_RDONLY)
		return;

394
	if (!test_opt(sb, ERRORS_CONT)) {
395
		journal_t *journal = EXT4_SB(sb)->s_journal;
396

397
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
398
		if (journal)
399
			jbd2_journal_abort(journal, -EIO);
400
	}
401
	if (test_opt(sb, ERRORS_RO)) {
402
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
403 404 405 406 407
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
408 409 410
		sb->s_flags |= MS_RDONLY;
	}
	if (test_opt(sb, ERRORS_PANIC))
411
		panic("EXT4-fs (device %s): panic forced after error\n",
412 413 414
			sb->s_id);
}

415 416 417 418
#define ext4_error_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),	\
			     "EXT4-fs error")

419
void __ext4_error(struct super_block *sb, const char *function,
420
		  unsigned int line, const char *fmt, ...)
421
{
J
Joe Perches 已提交
422
	struct va_format vaf;
423 424
	va_list args;

425 426 427 428 429 430 431 432 433
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT
		       "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
		       sb->s_id, function, line, current->comm, &vaf);
		va_end(args);
	}
434
	save_error_info(sb, function, line);
435
	ext4_handle_error(sb);
436 437
}

438 439 440
void __ext4_error_inode(struct inode *inode, const char *function,
			unsigned int line, ext4_fsblk_t block,
			const char *fmt, ...)
441 442
{
	va_list args;
443
	struct va_format vaf;
444
	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
445

446 447
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	es->s_last_error_block = cpu_to_le64(block);
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
	if (ext4_error_ratelimit(inode->i_sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: block %llu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, &vaf);
		else
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, &vaf);
		va_end(args);
	}
464
	save_error_info(inode->i_sb, function, line);
465 466 467
	ext4_handle_error(inode->i_sb);
}

468 469 470
void __ext4_error_file(struct file *file, const char *function,
		       unsigned int line, ext4_fsblk_t block,
		       const char *fmt, ...)
471 472
{
	va_list args;
473
	struct va_format vaf;
474
	struct ext4_super_block *es;
A
Al Viro 已提交
475
	struct inode *inode = file_inode(file);
476 477
	char pathname[80], *path;

478 479
	es = EXT4_SB(inode->i_sb)->s_es;
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500
	if (ext4_error_ratelimit(inode->i_sb)) {
		path = d_path(&(file->f_path), pathname, sizeof(pathname));
		if (IS_ERR(path))
			path = "(unknown)";
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "block %llu: comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, path, &vaf);
		else
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, path, &vaf);
		va_end(args);
	}
501
	save_error_info(inode->i_sb, function, line);
502 503 504
	ext4_handle_error(inode->i_sb);
}

505 506
const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
507 508 509 510 511 512 513 514 515 516 517
{
	char *errstr = NULL;

	switch (errno) {
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
518 519
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

539
/* __ext4_std_error decodes expected errors from journaling functions
540 541
 * automatically and invokes the appropriate error response.  */

542 543
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
544 545 546 547 548 549 550 551 552 553 554
{
	char nbuf[16];
	const char *errstr;

	/* Special case: if the error is EROFS, and we're not already
	 * inside a transaction, then there's really no point in logging
	 * an error. */
	if (errno == -EROFS && journal_current_handle() == NULL &&
	    (sb->s_flags & MS_RDONLY))
		return;

555 556 557 558 559
	if (ext4_error_ratelimit(sb)) {
		errstr = ext4_decode_error(sb, errno, nbuf);
		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
		       sb->s_id, function, line, errstr);
	}
560

561
	save_error_info(sb, function, line);
562
	ext4_handle_error(sb);
563 564 565
}

/*
566
 * ext4_abort is a much stronger failure handler than ext4_error.  The
567 568 569 570 571 572 573 574
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */

575
void __ext4_abort(struct super_block *sb, const char *function,
576
		unsigned int line, const char *fmt, ...)
577 578 579
{
	va_list args;

580
	save_error_info(sb, function, line);
581
	va_start(args, fmt);
582 583
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
584 585 586 587
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

588 589 590
	if ((sb->s_flags & MS_RDONLY) == 0) {
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
591 592 593 594 595 596
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
597 598 599 600
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
601
	if (test_opt(sb, ERRORS_PANIC))
602
		panic("EXT4-fs panic from previous error\n");
603 604
}

605 606
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
607
{
J
Joe Perches 已提交
608
	struct va_format vaf;
609 610
	va_list args;

611 612 613
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

614
	va_start(args, fmt);
J
Joe Perches 已提交
615 616 617
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
618 619 620
	va_end(args);
}

621
void __ext4_warning(struct super_block *sb, const char *function,
622
		    unsigned int line, const char *fmt, ...)
623
{
J
Joe Perches 已提交
624
	struct va_format vaf;
625 626
	va_list args;

627 628 629 630
	if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
			  "EXT4-fs warning"))
		return;

631
	va_start(args, fmt);
J
Joe Perches 已提交
632 633 634 635
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
636 637 638
	va_end(args);
}

639 640 641 642
void __ext4_grp_locked_error(const char *function, unsigned int line,
			     struct super_block *sb, ext4_group_t grp,
			     unsigned long ino, ext4_fsblk_t block,
			     const char *fmt, ...)
643 644 645
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
646
	struct va_format vaf;
647 648 649
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

650 651 652
	es->s_last_error_ino = cpu_to_le32(ino);
	es->s_last_error_block = cpu_to_le64(block);
	__save_error_info(sb, function, line);
J
Joe Perches 已提交
653

654 655 656 657 658 659 660 661 662 663 664 665 666 667
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
		       sb->s_id, function, line, grp);
		if (ino)
			printk(KERN_CONT "inode %lu: ", ino);
		if (block)
			printk(KERN_CONT "block %llu:",
			       (unsigned long long) block);
		printk(KERN_CONT "%pV\n", &vaf);
		va_end(args);
	}
668 669

	if (test_opt(sb, ERRORS_CONT)) {
670
		ext4_commit_super(sb, 0);
671 672
		return;
	}
673

674 675 676 677 678 679 680 681
	ext4_unlock_group(sb, grp);
	ext4_handle_error(sb);
	/*
	 * We only get here in the ERRORS_RO case; relocking the group
	 * may be dangerous, but nothing bad will happen since the
	 * filesystem will have already been marked read/only and the
	 * journal has been aborted.  We return 1 as a hint to callers
	 * who might what to use the return value from
L
Lucas De Marchi 已提交
682
	 * ext4_grp_locked_error() to distinguish between the
683 684 685 686 687 688 689 690
	 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
	 * aggressively from the ext4 function in question, with a
	 * more appropriate error code.
	 */
	ext4_lock_group(sb, grp);
	return;
}

691
void ext4_update_dynamic_rev(struct super_block *sb)
692
{
693
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
694

695
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
696 697
		return;

698
	ext4_warning(sb,
699 700
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
701
		     EXT4_DYNAMIC_REV);
702

703 704 705
	es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
706 707 708 709 710 711 712 713 714 715 716 717 718
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

	/*
	 * The rest of the superblock fields should be zero, and if not it
	 * means they are likely already in use, so leave them alone.  We
	 * can leave it up to e2fsck to clean up any inconsistencies there.
	 */
}

/*
 * Open the external journal device
 */
719
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
720 721 722 723
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

724
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
725 726 727 728 729
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
730
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
731 732 733 734 735 736 737
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
738
static void ext4_blkdev_put(struct block_device *bdev)
739
{
A
Al Viro 已提交
740
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
741 742
}

A
Al Viro 已提交
743
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
744 745 746 747
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
748
		ext4_blkdev_put(bdev);
749 750 751 752 753 754
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
755
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
756 757
}

758
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
759 760 761
{
	struct list_head *l;

762 763
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
764 765 766 767 768 769 770 771 772 773 774 775

	printk(KERN_ERR "sb_info orphan list:\n");
	list_for_each(l, &sbi->s_orphan) {
		struct inode *inode = orphan_list_entry(l);
		printk(KERN_ERR "  "
		       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
		       inode->i_sb->s_id, inode->i_ino, inode,
		       inode->i_mode, inode->i_nlink,
		       NEXT_ORPHAN(inode));
	}
}

776
static void ext4_put_super(struct super_block *sb)
777
{
778 779
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
780
	int i, err;
781

782
	ext4_unregister_li_request(sb);
783 784
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

785 786
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
787

788 789 790 791
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
792
			ext4_abort(sb, "Couldn't clean up the journal");
793
	}
794

795
	ext4_es_unregister_shrinker(sbi);
796
	del_timer_sync(&sbi->s_err_report);
797 798 799 800 801
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

802
	if (!(sb->s_flags & MS_RDONLY)) {
803
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
804 805
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
806
	if (!(sb->s_flags & MS_RDONLY))
807 808
		ext4_commit_super(sb, 1);

809
	if (sbi->s_proc) {
810
		remove_proc_entry("options", sbi->s_proc);
811
		remove_proc_entry(sb->s_id, ext4_proc_root);
812
	}
T
Theodore Ts'o 已提交
813
	kobject_del(&sbi->s_kobj);
814 815 816

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
817
	ext4_kvfree(sbi->s_group_desc);
818
	ext4_kvfree(sbi->s_flex_groups);
819
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
820 821
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
822
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
823
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
824 825 826 827 828 829 830 831 832 833 834 835 836 837
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif

	/* Debugging code just in case the in-memory inode orphan list
	 * isn't empty.  The on-disk one can be non-empty if we've
	 * detected an error and taken the fs readonly, but the
	 * in-memory list had better be clean by this point. */
	if (!list_empty(&sbi->s_orphan))
		dump_orphan_list(sb, sbi);
	J_ASSERT(list_empty(&sbi->s_orphan));

838
	invalidate_bdev(sb->s_bdev);
839 840 841 842 843 844 845
	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
		/*
		 * Invalidate the journal device's buffers.  We don't want them
		 * floating about in memory - the physical journal device may
		 * hotswapped, and it breaks the `ro-after' testing code.
		 */
		sync_blockdev(sbi->journal_bdev);
846
		invalidate_bdev(sbi->journal_bdev);
847
		ext4_blkdev_remove(sbi);
848
	}
849 850 851 852
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
853 854
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
855
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
856 857 858 859 860 861
	/*
	 * Now that we are completely done shutting down the
	 * superblock, we need to actually destroy the kobject.
	 */
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
862 863
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
864
	kfree(sbi->s_blockgroup_lock);
865 866 867
	kfree(sbi);
}

868
static struct kmem_cache *ext4_inode_cachep;
869 870 871 872

/*
 * Called inside transaction, so use GFP_NOFS
 */
873
static struct inode *ext4_alloc_inode(struct super_block *sb)
874
{
875
	struct ext4_inode_info *ei;
876

C
Christoph Lameter 已提交
877
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
878 879
	if (!ei)
		return NULL;
880

881
	ei->vfs_inode.i_version = 1;
882
	spin_lock_init(&ei->i_raw_lock);
883 884
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
885 886
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
887 888
	INIT_LIST_HEAD(&ei->i_es_lru);
	ei->i_es_lru_nr = 0;
889
	ei->i_touch_when = 0;
890 891 892
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
893
	ei->i_da_metadata_calc_len = 0;
894
	ei->i_da_metadata_calc_last_lblock = 0;
895
	spin_lock_init(&(ei->i_block_reservation_lock));
896 897 898
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
#endif
899
	ei->jinode = NULL;
900
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
901
	spin_lock_init(&ei->i_completed_io_lock);
902 903
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
904
	atomic_set(&ei->i_ioend_count, 0);
905
	atomic_set(&ei->i_unwritten, 0);
906
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
907

908 909 910
	return &ei->vfs_inode;
}

911 912 913 914 915 916 917 918
static int ext4_drop_inode(struct inode *inode)
{
	int drop = generic_drop_inode(inode);

	trace_ext4_drop_inode(inode, drop);
	return drop;
}

N
Nick Piggin 已提交
919 920 921 922 923 924
static void ext4_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}

925
static void ext4_destroy_inode(struct inode *inode)
926
{
927
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
928 929 930
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
931 932 933 934 935
		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
				EXT4_I(inode), sizeof(struct ext4_inode_info),
				true);
		dump_stack();
	}
N
Nick Piggin 已提交
936
	call_rcu(&inode->i_rcu, ext4_i_callback);
937 938
}

939
static void init_once(void *foo)
940
{
941
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
942

C
Christoph Lameter 已提交
943 944
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
945
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
946
	inode_init_once(&ei->vfs_inode);
947 948
}

949
static int __init init_inodecache(void)
950
{
951 952
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
953 954
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
955
					     init_once);
956
	if (ext4_inode_cachep == NULL)
957 958 959 960 961 962
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
963 964 965 966 967
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
968
	kmem_cache_destroy(ext4_inode_cachep);
969 970
}

A
Al Viro 已提交
971
void ext4_clear_inode(struct inode *inode)
972
{
A
Al Viro 已提交
973
	invalidate_inode_buffers(inode);
974
	clear_inode(inode);
975
	dquot_drop(inode);
976
	ext4_discard_preallocations(inode);
977
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
978
	ext4_es_lru_del(inode);
979 980 981 982 983 984
	if (EXT4_I(inode)->jinode) {
		jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
					       EXT4_I(inode)->jinode);
		jbd2_free_inode(EXT4_I(inode)->jinode);
		EXT4_I(inode)->jinode = NULL;
	}
985 986
}

C
Christoph Hellwig 已提交
987
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
988
					u64 ino, u32 generation)
989 990 991
{
	struct inode *inode;

992
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
993
		return ERR_PTR(-ESTALE);
994
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
995 996 997 998
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
999
	 * ext4_read_inode will return a bad_inode if the inode had been
1000 1001 1002 1003 1004
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1005 1006 1007 1008
	inode = ext4_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1009 1010 1011
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1012 1013 1014 1015 1016

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1017
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1018 1019 1020 1021 1022 1023
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
}

static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1024
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1025 1026 1027
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1028 1029
}

1030 1031 1032 1033 1034 1035
/*
 * Try to release metadata pages (indirect blocks, directories) which are
 * mapped via the block device.  Since these pages could have journal heads
 * which would prevent try_to_free_buffers() from freeing them, we must use
 * jbd2 layer's try_to_free_buffers() function to release them.
 */
1036 1037
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
{
	journal_t *journal = EXT4_SB(sb)->s_journal;

	WARN_ON(PageChecked(page));
	if (!page_has_buffers(page))
		return 0;
	if (journal)
		return jbd2_journal_try_to_free_buffers(journal, page,
							wait & ~__GFP_WAIT);
	return try_to_free_buffers(page);
}

1050
#ifdef CONFIG_QUOTA
1051
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1052
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1053

1054 1055 1056 1057 1058
static int ext4_write_dquot(struct dquot *dquot);
static int ext4_acquire_dquot(struct dquot *dquot);
static int ext4_release_dquot(struct dquot *dquot);
static int ext4_mark_dquot_dirty(struct dquot *dquot);
static int ext4_write_info(struct super_block *sb, int type);
1059
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1060
			 struct path *path);
1061 1062
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id);
1063
static int ext4_quota_off(struct super_block *sb, int type);
1064
static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1065 1066
static int ext4_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1067
			       size_t len, loff_t off);
1068
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1069
				const char *data, size_t len, loff_t off);
1070 1071 1072
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags);
static int ext4_enable_quotas(struct super_block *sb);
1073

1074
static const struct dquot_operations ext4_quota_operations = {
1075
	.get_reserved_space = ext4_get_reserved_space,
1076 1077 1078 1079
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1080 1081 1082
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1083 1084
};

1085
static const struct quotactl_ops ext4_qctl_operations = {
1086
	.quota_on	= ext4_quota_on,
1087
	.quota_off	= ext4_quota_off,
1088 1089 1090 1091 1092
	.quota_sync	= dquot_quota_sync,
	.get_info	= dquot_get_dqinfo,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
1093
};
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103

static const struct quotactl_ops ext4_qctl_sysfile_operations = {
	.quota_on_meta	= ext4_quota_on_sysfile,
	.quota_off	= ext4_quota_off_sysfile,
	.quota_sync	= dquot_quota_sync,
	.get_info	= dquot_get_dqinfo,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
};
1104 1105
#endif

1106
static const struct super_operations ext4_sops = {
1107 1108 1109 1110
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1111
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1112
	.evict_inode	= ext4_evict_inode,
1113 1114
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1115 1116
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1117 1118 1119
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1120
#ifdef CONFIG_QUOTA
1121 1122
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1123
#endif
1124
	.bdev_try_to_free_page = bdev_try_to_free_page,
1125 1126
};

1127 1128 1129 1130 1131
static const struct super_operations ext4_nojournal_sops = {
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1132
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1133
	.evict_inode	= ext4_evict_inode,
1134
	.sync_fs	= ext4_sync_fs_nojournal,
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
	.put_super	= ext4_put_super,
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
#ifdef CONFIG_QUOTA
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
#endif
	.bdev_try_to_free_page = bdev_try_to_free_page,
};

1146
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1147 1148
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1149
	.get_parent = ext4_get_parent,
1150 1151 1152 1153 1154
};

enum {
	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1155
	Opt_nouid32, Opt_debug, Opt_removed,
1156
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1157
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1158 1159
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1160
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1161
	Opt_data_err_abort, Opt_data_err_ignore,
1162
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1163
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1164
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1165
	Opt_usrquota, Opt_grpquota, Opt_i_version,
1166 1167
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1168
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1169
	Opt_dioread_nolock, Opt_dioread_lock,
1170
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1171
	Opt_max_dir_size_kb,
1172 1173
};

1174
static const match_table_t tokens = {
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	{Opt_bsd_df, "bsddf"},
	{Opt_minix_df, "minixdf"},
	{Opt_grpid, "grpid"},
	{Opt_grpid, "bsdgroups"},
	{Opt_nogrpid, "nogrpid"},
	{Opt_nogrpid, "sysvgroups"},
	{Opt_resgid, "resgid=%u"},
	{Opt_resuid, "resuid=%u"},
	{Opt_sb, "sb=%u"},
	{Opt_err_cont, "errors=continue"},
	{Opt_err_panic, "errors=panic"},
	{Opt_err_ro, "errors=remount-ro"},
	{Opt_nouid32, "nouid32"},
	{Opt_debug, "debug"},
1189 1190
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1191 1192 1193 1194
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1195
	{Opt_noload, "norecovery"},
1196
	{Opt_noload, "noload"},
1197 1198
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1199
	{Opt_commit, "commit=%u"},
1200 1201
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1202
	{Opt_journal_dev, "journal_dev=%u"},
1203
	{Opt_journal_path, "journal_path=%s"},
1204 1205
	{Opt_journal_checksum, "journal_checksum"},
	{Opt_journal_async_commit, "journal_async_commit"},
1206 1207 1208 1209
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1210 1211
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1212 1213 1214 1215 1216 1217
	{Opt_offusrjquota, "usrjquota="},
	{Opt_usrjquota, "usrjquota=%s"},
	{Opt_offgrpjquota, "grpjquota="},
	{Opt_grpjquota, "grpjquota=%s"},
	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
J
Jan Kara 已提交
1218
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1219 1220 1221 1222 1223
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1224 1225
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1226
	{Opt_i_version, "i_version"},
1227
	{Opt_stripe, "stripe=%u"},
1228
	{Opt_delalloc, "delalloc"},
1229
	{Opt_nodelalloc, "nodelalloc"},
1230 1231
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1232 1233
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1234
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1235
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1236
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1237 1238
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1239 1240
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1241 1242
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1243 1244 1245
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1246
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1247 1248 1249 1250 1251
	{Opt_removed, "check=none"},	/* mount option from ext2/3 */
	{Opt_removed, "nocheck"},	/* mount option from ext2/3 */
	{Opt_removed, "reservation"},	/* mount option from ext2/3 */
	{Opt_removed, "noreservation"}, /* mount option from ext2/3 */
	{Opt_removed, "journal=%u"},	/* mount option from ext2/3 */
J
Josef Bacik 已提交
1252
	{Opt_err, NULL},
1253 1254
};

1255
static ext4_fsblk_t get_sb_block(void **data)
1256
{
1257
	ext4_fsblk_t	sb_block;
1258 1259 1260 1261
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1262

1263
	options += 3;
1264
	/* TODO: use simple_strtoll with >32bit ext4 */
1265 1266
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1267
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1268 1269 1270 1271 1272 1273
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1274

1275 1276 1277
	return sb_block;
}

1278
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1279 1280
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
	"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1281

D
Dmitry Monakhov 已提交
1282 1283 1284 1285 1286
#ifdef CONFIG_QUOTA
static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *qname;
1287
	int ret = -1;
D
Dmitry Monakhov 已提交
1288 1289 1290 1291 1292 1293

	if (sb_any_quota_loaded(sb) &&
		!sbi->s_qf_names[qtype]) {
		ext4_msg(sb, KERN_ERR,
			"Cannot change journaled "
			"quota options when quota turned on");
1294
		return -1;
D
Dmitry Monakhov 已提交
1295
	}
1296 1297 1298 1299 1300
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
			 "when QUOTA feature is enabled");
		return -1;
	}
D
Dmitry Monakhov 已提交
1301 1302 1303 1304
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1305
		return -1;
D
Dmitry Monakhov 已提交
1306
	}
1307 1308 1309 1310 1311 1312 1313 1314
	if (sbi->s_qf_names[qtype]) {
		if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
			ret = 1;
		else
			ext4_msg(sb, KERN_ERR,
				 "%s quota file already specified",
				 QTYPE2NAME(qtype));
		goto errout;
D
Dmitry Monakhov 已提交
1315
	}
1316
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1317 1318
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1319
		goto errout;
D
Dmitry Monakhov 已提交
1320
	}
1321
	sbi->s_qf_names[qtype] = qname;
1322
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1323
	return 1;
1324 1325 1326
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
}

static int clear_qf_name(struct super_block *sb, int qtype)
{

	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sb_any_quota_loaded(sb) &&
		sbi->s_qf_names[qtype]) {
		ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
			" when quota turned on");
1338
		return -1;
D
Dmitry Monakhov 已提交
1339
	}
1340
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1341 1342 1343 1344 1345
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1346 1347 1348 1349 1350 1351
#define MOPT_SET	0x0001
#define MOPT_CLEAR	0x0002
#define MOPT_NOSUPPORT	0x0004
#define MOPT_EXPLICIT	0x0008
#define MOPT_CLEAR_ERR	0x0010
#define MOPT_GTE0	0x0020
1352
#ifdef CONFIG_QUOTA
1353 1354 1355 1356 1357
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1358
#endif
1359
#define MOPT_DATAJ	0x0080
1360 1361 1362
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1363
#define MOPT_STRING	0x0400
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375

static const struct mount_opts {
	int	token;
	int	mount_opt;
	int	flags;
} ext4_mount_opts[] = {
	{Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
	{Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
	{Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
	{Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
	{Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
	{Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1376 1377 1378 1379
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1380 1381
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1382 1383 1384
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1385
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1386 1387
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1388
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1389 1390 1391
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1392 1393 1394
	{Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
	{Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
	{Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1395 1396 1397 1398
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_SET},
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_CLEAR},
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
	{Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
	{Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
	{Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
	{Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
	{Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
	{Opt_commit, 0, MOPT_GTE0},
	{Opt_max_batch_time, 0, MOPT_GTE0},
	{Opt_min_batch_time, 0, MOPT_GTE0},
	{Opt_inode_readahead_blks, 0, MOPT_GTE0},
	{Opt_init_itable, 0, MOPT_GTE0},
	{Opt_stripe, 0, MOPT_GTE0},
1410 1411 1412
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
	{Opt_journal_dev, 0, MOPT_GTE0},
1413
	{Opt_journal_path, 0, MOPT_STRING},
1414
	{Opt_journal_ioprio, 0, MOPT_GTE0},
1415 1416 1417 1418
	{Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
	{Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
	{Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
	 MOPT_NO_EXT2 | MOPT_DATAJ},
1419 1420
	{Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
	{Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
T
Theodore Ts'o 已提交
1421
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1422 1423
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1424
#else
1425 1426
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1427
#endif
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
	{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
	{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
	{Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
	{Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
	{Opt_usrjquota, 0, MOPT_Q},
	{Opt_grpjquota, 0, MOPT_Q},
	{Opt_offusrjquota, 0, MOPT_Q},
	{Opt_offgrpjquota, 0, MOPT_Q},
	{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
	{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1444
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1445 1446 1447 1448 1449 1450 1451 1452 1453
	{Opt_err, 0, 0}
};

static int handle_mount_opt(struct super_block *sb, char *opt, int token,
			    substring_t *args, unsigned long *journal_devnum,
			    unsigned int *journal_ioprio, int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	const struct mount_opts *m;
1454 1455
	kuid_t uid;
	kgid_t gid;
1456 1457
	int arg = 0;

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
#ifdef CONFIG_QUOTA
	if (token == Opt_usrjquota)
		return set_qf_name(sb, USRQUOTA, &args[0]);
	else if (token == Opt_grpjquota)
		return set_qf_name(sb, GRPQUOTA, &args[0]);
	else if (token == Opt_offusrjquota)
		return clear_qf_name(sb, USRQUOTA);
	else if (token == Opt_offgrpjquota)
		return clear_qf_name(sb, GRPQUOTA);
#endif
1468
	switch (token) {
1469 1470 1471 1472
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1473 1474 1475
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1476
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1477 1478 1479 1480 1481 1482 1483 1484 1485
		return 1;
	case Opt_abort:
		sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
		return 1;
	case Opt_i_version:
		sb->s_flags |= MS_I_VERSION;
		return 1;
	}

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	for (m = ext4_mount_opts; m->token != Opt_err; m++)
		if (token == m->token)
			break;

	if (m->token == Opt_err) {
		ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
			 "or missing value", opt);
		return -1;
	}

1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
	if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Mount option \"%s\" incompatible with ext2", opt);
		return -1;
	}
	if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Mount option \"%s\" incompatible with ext3", opt);
		return -1;
	}

1507
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
	if (m->flags & MOPT_EXPLICIT)
		set_opt2(sb, EXPLICIT_DELALLOC);
	if (m->flags & MOPT_CLEAR_ERR)
		clear_opt(sb, ERRORS_MASK);
	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
		ext4_msg(sb, KERN_ERR, "Cannot change quota "
			 "options when quota turned on");
		return -1;
	}

	if (m->flags & MOPT_NOSUPPORT) {
		ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
	} else if (token == Opt_commit) {
		if (arg == 0)
			arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
		sbi->s_commit_interval = HZ * arg;
	} else if (token == Opt_max_batch_time) {
		sbi->s_max_batch_time = arg;
	} else if (token == Opt_min_batch_time) {
		sbi->s_min_batch_time = arg;
	} else if (token == Opt_inode_readahead_blks) {
1532 1533 1534 1535
		if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
			ext4_msg(sb, KERN_ERR,
				 "EXT4-fs: inode_readahead_blks must be "
				 "0 or a power of 2 smaller than 2^31");
1536
			return -1;
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
		}
		sbi->s_inode_readahead_blks = arg;
	} else if (token == Opt_init_itable) {
		set_opt(sb, INIT_INODE_TABLE);
		if (!args->from)
			arg = EXT4_DEF_LI_WAIT_MULT;
		sbi->s_li_wait_mult = arg;
	} else if (token == Opt_max_dir_size_kb) {
		sbi->s_max_dir_size_kb = arg;
	} else if (token == Opt_stripe) {
		sbi->s_stripe = arg;
	} else if (token == Opt_resuid) {
		uid = make_kuid(current_user_ns(), arg);
		if (!uid_valid(uid)) {
			ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1552 1553
			return -1;
		}
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568
		sbi->s_resuid = uid;
	} else if (token == Opt_resgid) {
		gid = make_kgid(current_user_ns(), arg);
		if (!gid_valid(gid)) {
			ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
			return -1;
		}
		sbi->s_resgid = gid;
	} else if (token == Opt_journal_dev) {
		if (is_remount) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot specify journal on remount");
			return -1;
		}
		*journal_devnum = arg;
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
	} else if (token == Opt_journal_path) {
		char *journal_path;
		struct inode *journal_inode;
		struct path path;
		int error;

		if (is_remount) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot specify journal on remount");
			return -1;
		}
		journal_path = match_strdup(&args[0]);
		if (!journal_path) {
			ext4_msg(sb, KERN_ERR, "error: could not dup "
				"journal device string");
			return -1;
		}

		error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
		if (error) {
			ext4_msg(sb, KERN_ERR, "error: could not find "
				"journal device path: error %d", error);
			kfree(journal_path);
			return -1;
		}

		journal_inode = path.dentry->d_inode;
		if (!S_ISBLK(journal_inode->i_mode)) {
			ext4_msg(sb, KERN_ERR, "error: journal path %s "
				"is not a block device", journal_path);
			path_put(&path);
			kfree(journal_path);
			return -1;
		}

		*journal_devnum = new_encode_dev(journal_inode->i_rdev);
		path_put(&path);
		kfree(journal_path);
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619
	} else if (token == Opt_journal_ioprio) {
		if (arg > 7) {
			ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
				 " (must be 0-7)");
			return -1;
		}
		*journal_ioprio =
			IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
	} else if (m->flags & MOPT_DATAJ) {
		if (is_remount) {
			if (!sbi->s_journal)
				ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
			else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1620
				ext4_msg(sb, KERN_ERR,
1621 1622
					 "Cannot change data mode on remount");
				return -1;
1623
			}
1624
		} else {
1625 1626
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1627
		}
1628 1629 1630 1631 1632 1633 1634 1635
#ifdef CONFIG_QUOTA
	} else if (m->flags & MOPT_QFMT) {
		if (sb_any_quota_loaded(sb) &&
		    sbi->s_jquota_fmt != m->mount_opt) {
			ext4_msg(sb, KERN_ERR, "Cannot change journaled "
				 "quota options when quota turned on");
			return -1;
		}
1636 1637 1638 1639 1640 1641 1642
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					       EXT4_FEATURE_RO_COMPAT_QUOTA)) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot set journaled quota options "
				 "when QUOTA feature is enabled");
			return -1;
		}
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
		sbi->s_jquota_fmt = m->mount_opt;
#endif
	} else {
		if (!args->from)
			arg = 1;
		if (m->flags & MOPT_CLEAR)
			arg = !arg;
		else if (unlikely(!(m->flags & MOPT_SET))) {
			ext4_msg(sb, KERN_WARNING,
				 "buggy handling of option %s", opt);
			WARN_ON(1);
			return -1;
		}
		if (arg != 0)
			sbi->s_mount_opt |= m->mount_opt;
		else
			sbi->s_mount_opt &= ~m->mount_opt;
1660
	}
1661
	return 1;
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
}

static int parse_options(char *options, struct super_block *sb,
			 unsigned long *journal_devnum,
			 unsigned int *journal_ioprio,
			 int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int token;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		if (!*p)
			continue;
		/*
		 * Initialize args struct so we know whether arg was
		 * found; some options take optional arguments.
		 */
1684
		args[0].to = args[0].from = NULL;
1685 1686 1687 1688
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1689 1690
	}
#ifdef CONFIG_QUOTA
1691 1692 1693 1694 1695 1696
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
			 "feature is enabled");
		return 0;
	}
1697
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1698
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1699
			clear_opt(sb, USRQUOTA);
1700

1701
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1702
			clear_opt(sb, GRPQUOTA);
1703

D
Dmitry Monakhov 已提交
1704
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1705 1706
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1707 1708 1709 1710
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1711 1712
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1713 1714 1715 1716
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
1717
			ext4_msg(sb, KERN_ERR, "journaled quota format "
1718
					"specified with no journaling "
1719
					"enabled");
1720 1721 1722 1723
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

		if (blocksize < PAGE_CACHE_SIZE) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1734 1735 1736
	return 1;
}

1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
static inline void ext4_show_quota_options(struct seq_file *seq,
					   struct super_block *sb)
{
#if defined(CONFIG_QUOTA)
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sbi->s_jquota_fmt) {
		char *fmtname = "";

		switch (sbi->s_jquota_fmt) {
		case QFMT_VFS_OLD:
			fmtname = "vfsold";
			break;
		case QFMT_VFS_V0:
			fmtname = "vfsv0";
			break;
		case QFMT_VFS_V1:
			fmtname = "vfsv1";
			break;
		}
		seq_printf(seq, ",jqfmt=%s", fmtname);
	}

	if (sbi->s_qf_names[USRQUOTA])
		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);

	if (sbi->s_qf_names[GRPQUOTA])
		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
#endif
}

1768 1769
static const char *token2str(int token)
{
1770
	const struct match_token *t;
1771 1772 1773 1774 1775 1776 1777

	for (t = tokens; t->token != Opt_err; t++)
		if (t->token == token && !strchr(t->pattern, '='))
			break;
	return t->pattern;
}

1778 1779 1780 1781 1782
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1783 1784
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1785 1786 1787
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1788
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1789
	const struct mount_opts *m;
1790
	char sep = nodefs ? '\n' : ',';
1791

1792 1793
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1794 1795

	if (sbi->s_sb_block != 1)
1796 1797 1798 1799 1800 1801 1802
		SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);

	for (m = ext4_mount_opts; m->token != Opt_err; m++) {
		int want_set = m->flags & MOPT_SET;
		if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
		    (m->flags & MOPT_CLEAR_ERR))
			continue;
1803
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1804 1805 1806 1807 1808 1809
			continue; /* skip if same as the default */
		if ((want_set &&
		     (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
		    (!want_set && (sbi->s_mount_opt & m->mount_opt)))
			continue; /* select Opt_noFoo vs Opt_Foo */
		SEQ_OPTS_PRINT("%s", token2str(m->token));
1810
	}
1811

1812
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1813
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1814 1815 1816
		SEQ_OPTS_PRINT("resuid=%u",
				from_kuid_munged(&init_user_ns, sbi->s_resuid));
	if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1817
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1818 1819
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1820
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1821 1822
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1823
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1824
		SEQ_OPTS_PUTS("errors=continue");
1825
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1826
		SEQ_OPTS_PUTS("errors=panic");
1827
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1828
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1829
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1830
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1831
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1832
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1833
	if (sb->s_flags & MS_I_VERSION)
1834
		SEQ_OPTS_PUTS("i_version");
1835
	if (nodefs || sbi->s_stripe)
1836
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1837
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1838 1839 1840 1841 1842 1843 1844
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			SEQ_OPTS_PUTS("data=journal");
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			SEQ_OPTS_PUTS("data=ordered");
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
			SEQ_OPTS_PUTS("data=writeback");
	}
1845 1846
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1847 1848
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1849

1850 1851
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1852
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1853 1854
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1855 1856 1857 1858 1859

	ext4_show_quota_options(seq, sb);
	return 0;
}

1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

static int options_seq_show(struct seq_file *seq, void *offset)
{
	struct super_block *sb = seq->private;
	int rc;

	seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
	rc = _ext4_show_options(seq, sb, 1);
	seq_puts(seq, "\n");
	return rc;
}

static int options_open_fs(struct inode *inode, struct file *file)
{
A
Al Viro 已提交
1878
	return single_open(file, options_seq_show, PDE_DATA(inode));
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
}

static const struct file_operations ext4_seq_options_fops = {
	.owner = THIS_MODULE,
	.open = options_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

1889
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1890 1891
			    int read_only)
{
1892
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1893 1894
	int res = 0;

1895
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1896 1897
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1898 1899 1900
		res = MS_RDONLY;
	}
	if (read_only)
1901
		goto done;
1902
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1903 1904
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1905
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1906 1907 1908
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1909
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1910 1911
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1912 1913 1914
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1915 1916 1917
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1918 1919 1920
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1921
	if (!sbi->s_journal)
1922
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1923
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1924
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1925
	le16_add_cpu(&es->s_mnt_count, 1);
1926
	es->s_mtime = cpu_to_le32(get_seconds());
1927
	ext4_update_dynamic_rev(sb);
1928 1929
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1930

1931
	ext4_commit_super(sb, 1);
1932
done:
1933
	if (test_opt(sb, DEBUG))
1934
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1935
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1936 1937
			sb->s_blocksize,
			sbi->s_groups_count,
1938 1939
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1940
			sbi->s_mount_opt, sbi->s_mount_opt2);
1941

D
Dan Magenheimer 已提交
1942
	cleancache_init_fs(sb);
1943 1944 1945
	return res;
}

1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct flex_groups *new_groups;
	int size;

	if (!sbi->s_log_groups_per_flex)
		return 0;

	size = ext4_flex_group(sbi, ngroup - 1) + 1;
	if (size <= sbi->s_flex_groups_allocated)
		return 0;

	size = roundup_pow_of_two(size * sizeof(struct flex_groups));
	new_groups = ext4_kvzalloc(size, GFP_KERNEL);
	if (!new_groups) {
		ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
			 size / (int) sizeof(struct flex_groups));
		return -ENOMEM;
	}

	if (sbi->s_flex_groups) {
		memcpy(new_groups, sbi->s_flex_groups,
		       (sbi->s_flex_groups_allocated *
			sizeof(struct flex_groups)));
		ext4_kvfree(sbi->s_flex_groups);
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

1978 1979 1980 1981 1982
static int ext4_fill_flex_info(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t flex_group;
1983
	int i, err;
1984

1985
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1986
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1987 1988 1989 1990
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

1991 1992
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
1993
		goto failed;
1994 1995

	for (i = 0; i < sbi->s_groups_count; i++) {
1996
		gdp = ext4_get_group_desc(sb, i, NULL);
1997 1998

		flex_group = ext4_flex_group(sbi, i);
1999 2000
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2001 2002
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2003 2004
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2005 2006 2007 2008 2009 2010 2011
	}

	return 1;
failed:
	return 0;
}

2012 2013
static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2014
{
2015
	int offset;
A
Andreas Dilger 已提交
2016
	__u16 crc = 0;
2017
	__le32 le_group = cpu_to_le32(block_group);
A
Andreas Dilger 已提交
2018

2019 2020 2021
	if ((sbi->s_es->s_feature_ro_compat &
	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
		/* Use new metadata_csum algorithm */
2022
		__le16 save_csum;
2023 2024
		__u32 csum32;

2025
		save_csum = gdp->bg_checksum;
2026 2027 2028 2029 2030
		gdp->bg_checksum = 0;
		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
				     sbi->s_desc_size);
2031
		gdp->bg_checksum = save_csum;
2032 2033 2034

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2035 2036
	}

2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
	/* old crc16 code */
	offset = offsetof(struct ext4_group_desc, bg_checksum);

	crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
	crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
	crc = crc16(crc, (__u8 *)gdp, offset);
	offset += sizeof(gdp->bg_checksum); /* skip checksum */
	/* for checksum of struct ext4_group_desc do the rest...*/
	if ((sbi->s_es->s_feature_incompat &
	     cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
	    offset < le16_to_cpu(sbi->s_es->s_desc_size))
		crc = crc16(crc, (__u8 *)gdp + offset,
			    le16_to_cpu(sbi->s_es->s_desc_size) -
				offset);

out:
A
Andreas Dilger 已提交
2053 2054 2055
	return cpu_to_le16(crc);
}

2056
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2057 2058
				struct ext4_group_desc *gdp)
{
2059 2060 2061
	if (ext4_has_group_desc_csum(sb) &&
	    (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
						      block_group, gdp)))
A
Andreas Dilger 已提交
2062 2063 2064 2065 2066
		return 0;

	return 1;
}

2067 2068 2069 2070 2071 2072 2073 2074
void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
			      struct ext4_group_desc *gdp)
{
	if (!ext4_has_group_desc_csum(sb))
		return;
	gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
}

2075
/* Called at mount-time, super-block is locked */
2076 2077
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2078
{
2079 2080 2081
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
	ext4_fsblk_t last_block;
L
Laurent Vivier 已提交
2082 2083 2084
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2085
	int flexbg_flag = 0;
2086
	ext4_group_t i, grp = sbi->s_groups_count;
2087

J
Jose R. Santos 已提交
2088 2089 2090
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2091
	ext4_debug("Checking group descriptors");
2092

2093 2094 2095
	for (i = 0; i < sbi->s_groups_count; i++) {
		struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);

J
Jose R. Santos 已提交
2096
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2097
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2098 2099
		else
			last_block = first_block +
2100
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2101

2102 2103 2104 2105
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2106
		block_bitmap = ext4_block_bitmap(sb, gdp);
2107
		if (block_bitmap < first_block || block_bitmap > last_block) {
2108
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2109
			       "Block bitmap for group %u not in group "
2110
			       "(block %llu)!", i, block_bitmap);
2111 2112
			return 0;
		}
2113
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2114
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2115
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2116
			       "Inode bitmap for group %u not in group "
2117
			       "(block %llu)!", i, inode_bitmap);
2118 2119
			return 0;
		}
2120
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2121
		if (inode_table < first_block ||
2122
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2123
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2124
			       "Inode table for group %u not in group "
2125
			       "(block %llu)!", i, inode_table);
2126 2127
			return 0;
		}
2128
		ext4_lock_group(sb, i);
2129
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2130 2131 2132 2133
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
				 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2134
			if (!(sb->s_flags & MS_RDONLY)) {
2135
				ext4_unlock_group(sb, i);
2136
				return 0;
2137
			}
A
Andreas Dilger 已提交
2138
		}
2139
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2140 2141
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2142
	}
2143 2144
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2145

2146 2147
	ext4_free_blocks_count_set(sbi->s_es,
				   EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2148
	sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2149 2150 2151
	return 1;
}

2152
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
 * the superblock) which were deleted from all directories, but held open by
 * a process at the time of a crash.  We walk the list and try to delete these
 * inodes at recovery time (only with a read-write filesystem).
 *
 * In order to keep the orphan inode chain consistent during traversal (in
 * case of crash during recovery), we link each inode into the superblock
 * orphan list_head and handle it the same way as an inode deletion during
 * normal operation (which journals the operations for us).
 *
 * We only do an iget() and an iput() on each inode, which is very safe if we
 * accidentally point at an in-use or already deleted inode.  The worst that
 * can happen in this case is that we get a "bit already cleared" message from
2165
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2166 2167 2168
 * e2fsck was run on this filesystem, and it must have already done the orphan
 * inode cleanup for us, so we can safely abort without any further action.
 */
2169 2170
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2182
	if (bdev_read_only(sb->s_bdev)) {
2183 2184
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2185 2186 2187
		return;
	}

2188 2189 2190 2191 2192 2193 2194
	/* Check if feature set would not allow a r/w mount */
	if (!ext4_feature_set_ok(sb, 0)) {
		ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
			 "unknown ROCOMPAT features");
		return;
	}

2195
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2196 2197
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2198 2199
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
2200 2201
			es->s_last_orphan = 0;
		}
2202 2203 2204 2205 2206
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2207
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2208 2209 2210 2211 2212 2213 2214
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
	/* Turn on quotas so that they are updated correctly */
	for (i = 0; i < MAXQUOTAS; i++) {
2215 2216
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2217
			if (ret < 0)
2218 2219 2220
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2221 2222 2223 2224 2225 2226 2227
		}
	}
#endif

	while (es->s_last_orphan) {
		struct inode *inode;

2228 2229
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2230 2231 2232 2233
			es->s_last_orphan = 0;
			break;
		}

2234
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2235
		dquot_initialize(inode);
2236
		if (inode->i_nlink) {
2237 2238 2239 2240
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2241
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2242
				  inode->i_ino, inode->i_size);
2243
			mutex_lock(&inode->i_mutex);
2244
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2245
			ext4_truncate(inode);
2246
			mutex_unlock(&inode->i_mutex);
2247 2248
			nr_truncates++;
		} else {
2249 2250 2251 2252
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2253 2254 2255 2256 2257 2258 2259
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2260
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2261 2262

	if (nr_orphans)
2263 2264
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2265
	if (nr_truncates)
2266 2267
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2268 2269 2270 2271
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sb_dqopt(sb)->files[i])
2272
			dquot_quota_off(sb, i);
2273 2274 2275 2276
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2277

2278 2279 2280 2281 2282 2283 2284
/*
 * Maximal extent format file size.
 * Resulting logical blkno at s_maxbytes must fit in our on-disk
 * extent format containers, within a sector_t, and within i_blocks
 * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
 * so that won't be a limiting factor.
 *
2285 2286 2287 2288 2289 2290
 * However there is other limiting factor. We do store extents in the form
 * of starting block and length, hence the resulting length of the extent
 * covering maximum file size must fit into on-disk format containers as
 * well. Given that length is always by 1 unit bigger than max unit (because
 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
 *
2291 2292
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2293
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2294 2295 2296 2297 2298
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2299
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2300
		/*
2301
		 * CONFIG_LBDAF is not enabled implies the inode
2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
		 * i_block represent total blocks in 512 bytes
		 * 32 == size of vfs inode i_blocks * 8
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (blkbits - 9);
		upper_limit <<= blkbits;
	}

2312 2313 2314 2315 2316 2317
	/*
	 * 32-bit extent-start container, ee_block. We lower the maxbytes
	 * by one fs block, so ee_len can cover the extent of maximum file
	 * size
	 */
	res = (1LL << 32) - 1;
2318 2319 2320 2321 2322 2323 2324 2325
	res <<= blkbits;

	/* Sanity check against vm- & vfs- imposed limits */
	if (res > upper_limit)
		res = upper_limit;

	return res;
}
2326 2327

/*
2328
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2329 2330
 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
 * We need to be 1 filesystem block less than the 2^48 sector limit.
2331
 */
2332
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2333
{
2334
	loff_t res = EXT4_NDIR_BLOCKS;
2335 2336
	int meta_blocks;
	loff_t upper_limit;
2337 2338 2339 2340 2341 2342
	/* This is calculated to be the largest file size for a dense, block
	 * mapped file such that the file's total number of 512-byte sectors,
	 * including data and all indirect blocks, does not exceed (2^48 - 1).
	 *
	 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
	 * number of 512-byte sectors of the file.
2343 2344
	 */

2345
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2346
		/*
2347
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2348 2349
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2350 2351 2352 2353 2354 2355 2356
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (bits - 9);

	} else {
A
Aneesh Kumar K.V 已提交
2357 2358 2359 2360 2361 2362
		/*
		 * We use 48 bit ext4_inode i_blocks
		 * With EXT4_HUGE_FILE_FL set the i_blocks
		 * represent total number of blocks in
		 * file system block size
		 */
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375
		upper_limit = (1LL << 48) - 1;

	}

	/* indirect blocks */
	meta_blocks = 1;
	/* double indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2));
	/* tripple indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));

	upper_limit -= meta_blocks;
	upper_limit <<= bits;
2376 2377 2378 2379 2380 2381 2382

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2383 2384 2385 2386

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2387 2388 2389
	return res;
}

2390
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2391
				   ext4_fsblk_t logical_sb_block, int nr)
2392
{
2393
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2394
	ext4_group_t bg, first_meta_bg;
2395 2396 2397 2398
	int has_super = 0;

	first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);

2399
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2400
	    nr < first_meta_bg)
2401
		return logical_sb_block + nr + 1;
2402
	bg = sbi->s_desc_per_block * nr;
2403
	if (ext4_bg_has_super(sb, bg))
2404
		has_super = 1;
2405

2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
	/*
	 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
	 * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
	 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
	 * compensate.
	 */
	if (sb->s_blocksize == 1024 && nr == 0 &&
	    le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
		has_super++;

2416
	return (has_super + ext4_group_first_block_no(sb, bg));
2417 2418
}

2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434
/**
 * ext4_get_stripe_size: Get the stripe size.
 * @sbi: In memory super block info
 *
 * If we have specified it via mount option, then
 * use the mount option value. If the value specified at mount time is
 * greater than the blocks per group use the super block value.
 * If the super block value is greater than blocks per group return 0.
 * Allocator needs it be less than blocks per group.
 *
 */
static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
{
	unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
	unsigned long stripe_width =
			le32_to_cpu(sbi->s_es->s_raid_stripe_width);
D
Dan Ehrenberg 已提交
2435
	int ret;
2436 2437

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2438 2439 2440 2441 2442 2443 2444
		ret = sbi->s_stripe;
	else if (stripe_width <= sbi->s_blocks_per_group)
		ret = stripe_width;
	else if (stride <= sbi->s_blocks_per_group)
		ret = stride;
	else
		ret = 0;
2445

D
Dan Ehrenberg 已提交
2446 2447 2448 2449 2450 2451
	/*
	 * If the stripe width is 1, this makes no sense and
	 * we set it to 0 to turn off stripe handling code.
	 */
	if (ret <= 1)
		ret = 0;
2452

D
Dan Ehrenberg 已提交
2453
	return ret;
2454
}
2455

T
Theodore Ts'o 已提交
2456 2457 2458 2459 2460
/* sysfs supprt */

struct ext4_attr {
	struct attribute attr;
	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2461
	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
T
Theodore Ts'o 已提交
2462
			 const char *, size_t);
2463 2464 2465 2466
	union {
		int offset;
		int deprecated_val;
	} u;
T
Theodore Ts'o 已提交
2467 2468
};

L
Lukas Czerner 已提交
2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
static int parse_strtoull(const char *buf,
		unsigned long long max, unsigned long long *value)
{
	int ret;

	ret = kstrtoull(skip_spaces(buf), 0, value);
	if (!ret && *value > max)
		ret = -EINVAL;
	return ret;
}

T
Theodore Ts'o 已提交
2480 2481 2482 2483 2484
static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
					      struct ext4_sb_info *sbi,
					      char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
2485 2486
		(s64) EXT4_C2B(sbi,
			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
T
Theodore Ts'o 已提交
2487 2488 2489 2490 2491 2492 2493
}

static ssize_t session_write_kbytes_show(struct ext4_attr *a,
					 struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

2494 2495
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
T
Theodore Ts'o 已提交
2496 2497 2498 2499 2500 2501 2502 2503 2504 2505
	return snprintf(buf, PAGE_SIZE, "%lu\n",
			(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			 sbi->s_sectors_written_start) >> 1);
}

static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
					  struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

2506 2507
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
T
Theodore Ts'o 已提交
2508
	return snprintf(buf, PAGE_SIZE, "%llu\n",
2509
			(unsigned long long)(sbi->s_kbytes_written +
T
Theodore Ts'o 已提交
2510
			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2511
			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
T
Theodore Ts'o 已提交
2512 2513 2514 2515 2516 2517 2518
}

static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
					  struct ext4_sb_info *sbi,
					  const char *buf, size_t count)
{
	unsigned long t;
2519
	int ret;
T
Theodore Ts'o 已提交
2520

2521 2522 2523
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
T
Theodore Ts'o 已提交
2524

2525
	if (t && (!is_power_of_2(t) || t > 0x40000000))
T
Theodore Ts'o 已提交
2526 2527 2528 2529 2530 2531 2532
		return -EINVAL;

	sbi->s_inode_readahead_blks = t;
	return count;
}

static ssize_t sbi_ui_show(struct ext4_attr *a,
2533
			   struct ext4_sb_info *sbi, char *buf)
T
Theodore Ts'o 已提交
2534
{
2535
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
T
Theodore Ts'o 已提交
2536 2537 2538 2539 2540 2541 2542 2543

	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
}

static ssize_t sbi_ui_store(struct ext4_attr *a,
			    struct ext4_sb_info *sbi,
			    const char *buf, size_t count)
{
2544
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
T
Theodore Ts'o 已提交
2545
	unsigned long t;
2546
	int ret;
T
Theodore Ts'o 已提交
2547

2548 2549 2550
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
T
Theodore Ts'o 已提交
2551 2552 2553 2554
	*ui = t;
	return count;
}

L
Lukas Czerner 已提交
2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575
static ssize_t reserved_clusters_show(struct ext4_attr *a,
				  struct ext4_sb_info *sbi, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
		(unsigned long long) atomic64_read(&sbi->s_resv_clusters));
}

static ssize_t reserved_clusters_store(struct ext4_attr *a,
				   struct ext4_sb_info *sbi,
				   const char *buf, size_t count)
{
	unsigned long long val;
	int ret;

	if (parse_strtoull(buf, -1ULL, &val))
		return -EINVAL;
	ret = ext4_reserve_clusters(sbi, val);

	return ret ? ret : count;
}

2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592
static ssize_t trigger_test_error(struct ext4_attr *a,
				  struct ext4_sb_info *sbi,
				  const char *buf, size_t count)
{
	int len = count;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (len && buf[len-1] == '\n')
		len--;

	if (len)
		ext4_error(sbi->s_sb, "%.*s", len, buf);
	return count;
}

2593 2594 2595 2596 2597 2598
static ssize_t sbi_deprecated_show(struct ext4_attr *a,
				   struct ext4_sb_info *sbi, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
}

T
Theodore Ts'o 已提交
2599 2600 2601 2602 2603
#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show	= _show,					\
	.store	= _store,					\
2604 2605 2606
	.u = {							\
		.offset = offsetof(struct ext4_sb_info, _elname),\
	},							\
T
Theodore Ts'o 已提交
2607 2608 2609 2610
}
#define EXT4_ATTR(name, mode, show, store) \
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)

2611
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
T
Theodore Ts'o 已提交
2612 2613 2614 2615 2616
#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
#define EXT4_RW_ATTR_SBI_UI(name, elname)	\
	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
#define ATTR_LIST(name) &ext4_attr_##name.attr
2617 2618 2619 2620 2621 2622 2623 2624
#define EXT4_DEPRECATED_ATTR(_name, _val)	\
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = 0444 },	\
	.show	= sbi_deprecated_show,				\
	.u = {							\
		.deprecated_val = _val,				\
	},							\
}
T
Theodore Ts'o 已提交
2625 2626 2627 2628

EXT4_RO_ATTR(delayed_allocation_blocks);
EXT4_RO_ATTR(session_write_kbytes);
EXT4_RO_ATTR(lifetime_write_kbytes);
L
Lukas Czerner 已提交
2629
EXT4_RW_ATTR(reserved_clusters);
T
Theodore Ts'o 已提交
2630 2631
EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
		 inode_readahead_blks_store, s_inode_readahead_blks);
2632
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
T
Theodore Ts'o 已提交
2633 2634 2635 2636 2637 2638
EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2639
EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2640
EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2641
EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2642 2643 2644 2645 2646 2647
EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
T
Theodore Ts'o 已提交
2648 2649 2650 2651 2652

static struct attribute *ext4_attrs[] = {
	ATTR_LIST(delayed_allocation_blocks),
	ATTR_LIST(session_write_kbytes),
	ATTR_LIST(lifetime_write_kbytes),
L
Lukas Czerner 已提交
2653
	ATTR_LIST(reserved_clusters),
T
Theodore Ts'o 已提交
2654
	ATTR_LIST(inode_readahead_blks),
2655
	ATTR_LIST(inode_goal),
T
Theodore Ts'o 已提交
2656 2657 2658 2659 2660 2661
	ATTR_LIST(mb_stats),
	ATTR_LIST(mb_max_to_scan),
	ATTR_LIST(mb_min_to_scan),
	ATTR_LIST(mb_order2_req),
	ATTR_LIST(mb_stream_req),
	ATTR_LIST(mb_group_prealloc),
2662
	ATTR_LIST(max_writeback_mb_bump),
2663
	ATTR_LIST(extent_max_zeroout_kb),
2664
	ATTR_LIST(trigger_fs_error),
2665 2666 2667 2668 2669 2670
	ATTR_LIST(err_ratelimit_interval_ms),
	ATTR_LIST(err_ratelimit_burst),
	ATTR_LIST(warning_ratelimit_interval_ms),
	ATTR_LIST(warning_ratelimit_burst),
	ATTR_LIST(msg_ratelimit_interval_ms),
	ATTR_LIST(msg_ratelimit_burst),
T
Theodore Ts'o 已提交
2671 2672 2673
	NULL,
};

2674 2675
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
2676
EXT4_INFO_ATTR(batched_discard);
2677
EXT4_INFO_ATTR(meta_bg_resize);
2678 2679 2680

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
2681
	ATTR_LIST(batched_discard),
2682
	ATTR_LIST(meta_bg_resize),
2683 2684 2685
	NULL,
};

T
Theodore Ts'o 已提交
2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713
static ssize_t ext4_attr_show(struct kobject *kobj,
			      struct attribute *attr, char *buf)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);

	return a->show ? a->show(a, sbi, buf) : 0;
}

static ssize_t ext4_attr_store(struct kobject *kobj,
			       struct attribute *attr,
			       const char *buf, size_t len)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);

	return a->store ? a->store(a, sbi, buf, len) : 0;
}

static void ext4_sb_release(struct kobject *kobj)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	complete(&sbi->s_kobj_unregister);
}

2714
static const struct sysfs_ops ext4_attr_ops = {
T
Theodore Ts'o 已提交
2715 2716 2717 2718 2719 2720 2721 2722 2723 2724
	.show	= ext4_attr_show,
	.store	= ext4_attr_store,
};

static struct kobj_type ext4_ktype = {
	.default_attrs	= ext4_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_sb_release,
};

2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735
static void ext4_feat_release(struct kobject *kobj)
{
	complete(&ext4_feat->f_kobj_unregister);
}

static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_feat_release,
};

2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775
/*
 * Check whether this filesystem can be mounted based on
 * the features present and the RDONLY/RDWR mount requested.
 * Returns 1 if this filesystem can be mounted as requested,
 * 0 if it cannot be.
 */
static int ext4_feature_set_ok(struct super_block *sb, int readonly)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
		ext4_msg(sb, KERN_ERR,
			"Couldn't mount because of "
			"unsupported optional features (%x)",
			(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
			~EXT4_FEATURE_INCOMPAT_SUPP));
		return 0;
	}

	if (readonly)
		return 1;

	/* Check that feature set is OK for a read-write mount */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
		ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
			 "unsupported optional features (%x)",
			 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
				~EXT4_FEATURE_RO_COMPAT_SUPP));
		return 0;
	}
	/*
	 * Large file size enabled file system can only be mounted
	 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
	 */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2776 2777 2778 2779 2780 2781 2782
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2783 2784 2785 2786 2787 2788 2789 2790 2791 2792

#ifndef CONFIG_QUOTA
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    !readonly) {
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
#endif  /* CONFIG_QUOTA */
2793 2794 2795
	return 1;
}

2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809
/*
 * This function is called once a day if we have errors logged
 * on the file system
 */
static void print_daily_error_info(unsigned long arg)
{
	struct super_block *sb = (struct super_block *) arg;
	struct ext4_sb_info *sbi;
	struct ext4_super_block *es;

	sbi = EXT4_SB(sb);
	es = sbi->s_es;

	if (es->s_error_count)
2810 2811
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2812 2813
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2814
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827
		       sb->s_id, le32_to_cpu(es->s_first_error_time),
		       (int) sizeof(es->s_first_error_func),
		       es->s_first_error_func,
		       le32_to_cpu(es->s_first_error_line));
		if (es->s_first_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_first_error_block));
		printk("\n");
	}
	if (es->s_last_error_time) {
2828
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843
		       sb->s_id, le32_to_cpu(es->s_last_error_time),
		       (int) sizeof(es->s_last_error_func),
		       es->s_last_error_func,
		       le32_to_cpu(es->s_last_error_line));
		if (es->s_last_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_last_error_block));
		printk("\n");
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855
/* Find next suitable group and run ext4_init_inode_table */
static int ext4_run_li_request(struct ext4_li_request *elr)
{
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t group, ngroups;
	struct super_block *sb;
	unsigned long timeout = 0;
	int ret = 0;

	sb = elr->lr_super;
	ngroups = EXT4_SB(sb)->s_groups_count;

2856
	sb_start_write(sb);
2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867
	for (group = elr->lr_next_group; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp) {
			ret = 1;
			break;
		}

		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			break;
	}

2868
	if (group >= ngroups)
2869 2870 2871 2872 2873 2874 2875
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2876 2877
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2878 2879 2880 2881 2882
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2883
	sb_end_write(sb);
2884 2885 2886 2887 2888 2889

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2890
 * request structure. Should be called with li_list_mtx held
2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907
 */
static void ext4_remove_li_request(struct ext4_li_request *elr)
{
	struct ext4_sb_info *sbi;

	if (!elr)
		return;

	sbi = elr->lr_sbi;

	list_del(&elr->lr_request);
	sbi->s_li_request = NULL;
	kfree(elr);
}

static void ext4_unregister_li_request(struct super_block *sb)
{
2908 2909 2910
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2911
		return;
2912
	}
2913 2914

	mutex_lock(&ext4_li_info->li_list_mtx);
2915
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2916
	mutex_unlock(&ext4_li_info->li_list_mtx);
2917
	mutex_unlock(&ext4_li_mtx);
2918 2919
}

2920 2921
static struct task_struct *ext4_lazyinit_task;

2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935
/*
 * This is the function where ext4lazyinit thread lives. It walks
 * through the request list searching for next scheduled filesystem.
 * When such a fs is found, run the lazy initialization request
 * (ext4_rn_li_request) and keep track of the time spend in this
 * function. Based on that time we compute next schedule time of
 * the request. When walking through the list is complete, compute
 * next waking time and put itself into sleep.
 */
static int ext4_lazyinit_thread(void *arg)
{
	struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
	struct list_head *pos, *n;
	struct ext4_li_request *elr;
2936
	unsigned long next_wakeup, cur;
2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953

	BUG_ON(NULL == eli);

cont_thread:
	while (true) {
		next_wakeup = MAX_JIFFY_OFFSET;

		mutex_lock(&eli->li_list_mtx);
		if (list_empty(&eli->li_request_list)) {
			mutex_unlock(&eli->li_list_mtx);
			goto exit_thread;
		}

		list_for_each_safe(pos, n, &eli->li_request_list) {
			elr = list_entry(pos, struct ext4_li_request,
					 lr_request);

2954 2955 2956 2957 2958 2959
			if (time_after_eq(jiffies, elr->lr_next_sched)) {
				if (ext4_run_li_request(elr) != 0) {
					/* error, remove the lazy_init job */
					ext4_remove_li_request(elr);
					continue;
				}
2960 2961 2962 2963 2964 2965 2966
			}

			if (time_before(elr->lr_next_sched, next_wakeup))
				next_wakeup = elr->lr_next_sched;
		}
		mutex_unlock(&eli->li_list_mtx);

2967
		try_to_freeze();
2968

2969 2970
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2971
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2972 2973 2974 2975
			cond_resched();
			continue;
		}

2976 2977
		schedule_timeout_interruptible(next_wakeup - cur);

2978 2979 2980 2981
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023
	}

exit_thread:
	/*
	 * It looks like the request list is empty, but we need
	 * to check it under the li_list_mtx lock, to prevent any
	 * additions into it, and of course we should lock ext4_li_mtx
	 * to atomically free the list and ext4_li_info, because at
	 * this point another ext4 filesystem could be registering
	 * new one.
	 */
	mutex_lock(&ext4_li_mtx);
	mutex_lock(&eli->li_list_mtx);
	if (!list_empty(&eli->li_request_list)) {
		mutex_unlock(&eli->li_list_mtx);
		mutex_unlock(&ext4_li_mtx);
		goto cont_thread;
	}
	mutex_unlock(&eli->li_list_mtx);
	kfree(ext4_li_info);
	ext4_li_info = NULL;
	mutex_unlock(&ext4_li_mtx);

	return 0;
}

static void ext4_clear_request_list(void)
{
	struct list_head *pos, *n;
	struct ext4_li_request *elr;

	mutex_lock(&ext4_li_info->li_list_mtx);
	list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
		elr = list_entry(pos, struct ext4_li_request,
				 lr_request);
		ext4_remove_li_request(elr);
	}
	mutex_unlock(&ext4_li_info->li_list_mtx);
}

static int ext4_run_lazyinit_thread(void)
{
3024 3025 3026 3027
	ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
					 ext4_li_info, "ext4lazyinit");
	if (IS_ERR(ext4_lazyinit_task)) {
		int err = PTR_ERR(ext4_lazyinit_task);
3028 3029 3030
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
3031
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099
				 "initialization thread\n",
				 err);
		return err;
	}
	ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
	return 0;
}

/*
 * Check whether it make sense to run itable init. thread or not.
 * If there is at least one uninitialized inode table, return
 * corresponding group number, else the loop goes through all
 * groups and return total number of groups.
 */
static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
{
	ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
	struct ext4_group_desc *gdp = NULL;

	for (group = 0; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp)
			continue;

		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			break;
	}

	return group;
}

static int ext4_li_info_new(void)
{
	struct ext4_lazy_init *eli = NULL;

	eli = kzalloc(sizeof(*eli), GFP_KERNEL);
	if (!eli)
		return -ENOMEM;

	INIT_LIST_HEAD(&eli->li_request_list);
	mutex_init(&eli->li_list_mtx);

	eli->li_state |= EXT4_LAZYINIT_QUIT;

	ext4_li_info = eli;

	return 0;
}

static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
					    ext4_group_t start)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_li_request *elr;

	elr = kzalloc(sizeof(*elr), GFP_KERNEL);
	if (!elr)
		return NULL;

	elr->lr_super = sb;
	elr->lr_sbi = sbi;
	elr->lr_next_group = start;

	/*
	 * Randomize first schedule time of the request to
	 * spread the inode table initialization requests
	 * better.
	 */
3100 3101
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3102 3103 3104
	return elr;
}

3105 3106
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3107 3108
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3109
	struct ext4_li_request *elr = NULL;
3110
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3111
	int ret = 0;
3112

3113
	mutex_lock(&ext4_li_mtx);
3114 3115 3116 3117 3118 3119
	if (sbi->s_li_request != NULL) {
		/*
		 * Reset timeout so it can be computed again, because
		 * s_li_wait_mult might have changed.
		 */
		sbi->s_li_request->lr_timeout = 0;
3120
		goto out;
3121
	}
3122 3123 3124

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3125
	    !test_opt(sb, INIT_INODE_TABLE))
3126
		goto out;
3127 3128

	elr = ext4_li_request_new(sb, first_not_zeroed);
3129 3130 3131 3132
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144

	if (NULL == ext4_li_info) {
		ret = ext4_li_info_new();
		if (ret)
			goto out;
	}

	mutex_lock(&ext4_li_info->li_list_mtx);
	list_add(&elr->lr_request, &ext4_li_info->li_request_list);
	mutex_unlock(&ext4_li_info->li_list_mtx);

	sbi->s_li_request = elr;
3145 3146 3147 3148 3149 3150
	/*
	 * set elr to NULL here since it has been inserted to
	 * the request_list and the removal and free of it is
	 * handled by ext4_clear_request_list from now on.
	 */
	elr = NULL;
3151 3152 3153 3154 3155 3156 3157

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3158 3159
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173
		kfree(elr);
	return ret;
}

/*
 * We do not need to lock anything since this is called on
 * module unload.
 */
static void ext4_destroy_lazyinit_thread(void)
{
	/*
	 * If thread exited earlier
	 * there's nothing to be done.
	 */
3174
	if (!ext4_li_info || !ext4_lazyinit_task)
3175 3176
		return;

3177
	kthread_stop(ext4_lazyinit_task);
3178 3179
}

3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217
static int set_journal_csum_feature_set(struct super_block *sb)
{
	int ret = 1;
	int compat, incompat;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		/* journal checksum v2 */
		compat = 0;
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				incompat);
	} else if (test_opt(sb, JOURNAL_CHECKSUM)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				incompat);
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	} else {
		jbd2_journal_clear_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				JBD2_FEATURE_INCOMPAT_CSUM_V2);
	}

	return ret;
}

3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
/*
 * Note: calculating the overhead so we can be compatible with
 * historical BSD practice is quite difficult in the face of
 * clusters/bigalloc.  This is because multiple metadata blocks from
 * different block group can end up in the same allocation cluster.
 * Calculating the exact overhead in the face of clustered allocation
 * requires either O(all block bitmaps) in memory or O(number of block
 * groups**2) in time.  We will still calculate the superblock for
 * older file systems --- and if we come across with a bigalloc file
 * system with zero in s_overhead_clusters the estimate will be close to
 * correct especially for very large cluster sizes --- but for newer
 * file systems, it's better to calculate this figure once at mkfs
 * time, and store it in the superblock.  If the superblock value is
 * present (even for non-bigalloc file systems), we will use it.
 */
static int count_overhead(struct super_block *sb, ext4_group_t grp,
			  char *buf)
{
	struct ext4_sb_info	*sbi = EXT4_SB(sb);
	struct ext4_group_desc	*gdp;
	ext4_fsblk_t		first_block, last_block, b;
	ext4_group_t		i, ngroups = ext4_get_groups_count(sb);
	int			s, j, count = 0;

3242 3243 3244 3245
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322
	first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
		(grp * EXT4_BLOCKS_PER_GROUP(sb));
	last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
	for (i = 0; i < ngroups; i++) {
		gdp = ext4_get_group_desc(sb, i, NULL);
		b = ext4_block_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_table(sb, gdp);
		if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
			for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
				int c = EXT4_B2C(sbi, b - first_block);
				ext4_set_bit(c, buf);
				count++;
			}
		if (i != grp)
			continue;
		s = 0;
		if (ext4_bg_has_super(sb, grp)) {
			ext4_set_bit(s++, buf);
			count++;
		}
		for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
			ext4_set_bit(EXT4_B2C(sbi, s++), buf);
			count++;
		}
	}
	if (!count)
		return 0;
	return EXT4_CLUSTERS_PER_GROUP(sb) -
		ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
}

/*
 * Compute the overhead and stash it in sbi->s_overhead
 */
int ext4_calculate_overhead(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
	char *buf = (char *) get_zeroed_page(GFP_KERNEL);

	if (!buf)
		return -ENOMEM;

	/*
	 * Compute the overhead (FS structures).  This is constant
	 * for a given filesystem unless the number of block groups
	 * changes so we cache the previous value until it does.
	 */

	/*
	 * All of the blocks before first_data_block are overhead
	 */
	overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));

	/*
	 * Add the overhead found in each block group
	 */
	for (i = 0; i < ngroups; i++) {
		int blks;

		blks = count_overhead(sb, i, buf);
		overhead += blks;
		if (blks)
			memset(buf, 0, PAGE_SIZE);
		cond_resched();
	}
3323 3324
	/* Add the journal blocks as well */
	if (sbi->s_journal)
3325
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3326

3327 3328 3329 3330 3331 3332
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

L
Lukas Czerner 已提交
3333

3334
static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3335 3336 3337
{
	ext4_fsblk_t resv_clusters;

3338 3339 3340 3341 3342 3343 3344 3345
	/*
	 * There's no need to reserve anything when we aren't using extents.
	 * The space estimates are exact, there are no unwritten extents,
	 * hole punching doesn't need new metadata... This is needed especially
	 * to keep ext2/3 backward compatibility.
	 */
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
		return 0;
L
Lukas Czerner 已提交
3346 3347 3348 3349
	/*
	 * By default we reserve 2% or 4096 clusters, whichever is smaller.
	 * This should cover the situations where we can not afford to run
	 * out of space like for example punch hole, or converting
3350
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3351 3352 3353
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3354 3355
	resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
			EXT4_SB(sb)->s_cluster_bits;
L
Lukas Czerner 已提交
3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375

	do_div(resv_clusters, 50);
	resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);

	return resv_clusters;
}


static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
{
	ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
				sbi->s_cluster_bits;

	if (count >= clusters)
		return -EINVAL;

	atomic64_set(&sbi->s_resv_clusters, count);
	return 0;
}

3376
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3377
{
3378
	char *orig_data = kstrdup(data, GFP_KERNEL);
3379
	struct buffer_head *bh;
3380 3381 3382 3383
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3384
	ext4_fsblk_t logical_sb_block;
3385 3386 3387 3388
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3389
	char *cp;
3390
	const char *descr;
3391
	int ret = -ENOMEM;
3392
	int blocksize, clustersize;
3393 3394
	unsigned int db_count;
	unsigned int i;
3395
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3396
	__u64 blocks_count;
3397
	int err = 0;
3398
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3399
	ext4_group_t first_not_zeroed;
3400 3401 3402

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3403
		goto out_free_orig;
3404 3405 3406 3407 3408

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3409
		goto out_free_orig;
3410
	}
3411
	sb->s_fs_info = sbi;
3412
	sbi->s_sb = sb;
3413
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3414
	sbi->s_sb_block = sb_block;
3415 3416 3417
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3418

3419 3420 3421 3422
	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

3423
	/* -EINVAL is default */
3424
	ret = -EINVAL;
3425
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3426
	if (!blocksize) {
3427
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3428 3429 3430 3431
		goto out_fail;
	}

	/*
3432
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3433 3434
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3435
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3436 3437
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3438
	} else {
3439
		logical_sb_block = sb_block;
3440 3441
	}

3442
	if (!(bh = sb_bread(sb, logical_sb_block))) {
3443
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3444 3445 3446 3447
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3448
	 *       some ext4 macro-instructions depend on its value
3449
	 */
3450
	es = (struct ext4_super_block *) (bh->b_data + offset);
3451 3452
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3453 3454
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3455
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3456

3457 3458 3459 3460 3461 3462 3463
	/* Warn if metadata_csum and gdt_csum are both set. */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
	    EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
		ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
			     "redundant flags; please run fsck.");

3464 3465 3466 3467 3468 3469 3470 3471
	/* Check for a known checksum algorithm */
	if (!ext4_verify_csum_type(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "unknown checksum algorithm.");
		silent = 1;
		goto cantfind_ext4;
	}

3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483
	/* Load the checksum driver */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
		if (IS_ERR(sbi->s_chksum_driver)) {
			ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
			ret = PTR_ERR(sbi->s_chksum_driver);
			sbi->s_chksum_driver = NULL;
			goto failed_mount;
		}
	}

3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497
	/* Check superblock checksum */
	if (!ext4_superblock_csum_verify(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "invalid superblock checksum.  Run e2fsck?");
		silent = 1;
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3498 3499
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3500
	set_opt(sb, INIT_INODE_TABLE);
3501
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3502
		set_opt(sb, DEBUG);
3503
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3504
		set_opt(sb, GRPID);
3505
	if (def_mount_opts & EXT4_DEFM_UID16)
3506
		set_opt(sb, NO_UID32);
3507 3508
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3509
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3510
	set_opt(sb, POSIX_ACL);
3511
#endif
3512
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3513
		set_opt(sb, JOURNAL_DATA);
3514
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3515
		set_opt(sb, ORDERED_DATA);
3516
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3517
		set_opt(sb, WRITEBACK_DATA);
3518 3519

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3520
		set_opt(sb, ERRORS_PANIC);
3521
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3522
		set_opt(sb, ERRORS_CONT);
3523
	else
3524
		set_opt(sb, ERRORS_RO);
3525
	if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3526
		set_opt(sb, BLOCK_VALIDITY);
3527
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3528
		set_opt(sb, DISCARD);
3529

3530 3531
	sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
	sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3532 3533 3534
	sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
	sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
	sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3535

3536
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3537
		set_opt(sb, BARRIER);
3538

3539 3540 3541 3542
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3543
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3544
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3545
		set_opt(sb, DELALLOC);
3546

3547 3548 3549 3550 3551 3552
	/*
	 * set default s_li_wait_mult for lazyinit, for the case there is
	 * no mount option specified.
	 */
	sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;

3553
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3554
			   &journal_devnum, &journal_ioprio, 0)) {
3555 3556 3557 3558
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3559
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3560
	if (!parse_options((char *) data, sb, &journal_devnum,
3561
			   &journal_ioprio, 0))
3562 3563
		goto failed_mount;

3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
			    "with data=journal disables delayed "
			    "allocation and O_DIRECT support!\n");
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			goto failed_mount;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
3575
				 "both data=journal and dioread_nolock");
3576 3577 3578 3579 3580 3581
			goto failed_mount;
		}
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
	}

3582
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3583
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3584

3585 3586 3587 3588
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
	    (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3589 3590 3591
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3592

3593 3594 3595 3596 3597 3598 3599 3600 3601 3602
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
		if (EXT4_HAS_INCOMPAT_FEATURE(sb,
					      EXT4_FEATURE_INCOMPAT_64BIT)) {
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624
	if (IS_EXT2_SB(sb)) {
		if (ext2_feature_set_ok(sb))
			ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
				 "using the ext4 subsystem");
		else {
			ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
				 "to feature incompatibilities");
			goto failed_mount;
		}
	}

	if (IS_EXT3_SB(sb)) {
		if (ext3_feature_set_ok(sb))
			ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
				 "using the ext4 subsystem");
		else {
			ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
				 "to feature incompatibilities");
			goto failed_mount;
		}
	}

3625 3626 3627 3628 3629
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
3630
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3631
		goto failed_mount;
3632

J
Jan Kara 已提交
3633
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3634 3635
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3636 3637
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3638 3639 3640 3641
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {
3642 3643
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3644
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3645
					blocksize);
3646 3647 3648
			goto failed_mount;
		}

3649
		brelse(bh);
3650 3651 3652
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
		bh = sb_bread(sb, logical_sb_block);
3653
		if (!bh) {
3654 3655
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3656 3657
			goto failed_mount;
		}
3658
		es = (struct ext4_super_block *)(bh->b_data + offset);
3659
		sbi->s_es = es;
3660
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3661 3662
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3663 3664 3665 3666
			goto failed_mount;
		}
	}

3667 3668
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3669 3670 3671
	sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
						      has_huge_files);
	sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3672

3673 3674 3675
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3676 3677 3678
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3679
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3680
		    (!is_power_of_2(sbi->s_inode_size)) ||
3681
		    (sbi->s_inode_size > blocksize)) {
3682 3683
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3684
			       sbi->s_inode_size);
3685 3686
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3687 3688
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3689
	}
3690

3691 3692
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3693
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3694
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3695
		    !is_power_of_2(sbi->s_desc_size)) {
3696 3697
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3698 3699 3700 3701 3702
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3703

3704 3705
	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3706
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3707
		goto cantfind_ext4;
3708

3709
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3710
	if (sbi->s_inodes_per_block == 0)
3711
		goto cantfind_ext4;
3712 3713
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3714
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3715 3716
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3717 3718
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3719

3720
	for (i = 0; i < 4; i++)
3721 3722
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3723 3724 3725 3726 3727
	if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
		i = le32_to_cpu(es->s_flags);
		if (i & EXT2_FLAGS_UNSIGNED_HASH)
			sbi->s_hash_unsigned = 3;
		else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3728
#ifdef __CHAR_UNSIGNED__
3729 3730 3731 3732
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3733
#else
3734 3735 3736
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3737
#endif
3738
		}
3739
	}
3740

3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
	has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_BIGALLOC);
	if (has_bigalloc) {
		if (clustersize < blocksize) {
			ext4_msg(sb, KERN_ERR,
				 "cluster size (%d) smaller than "
				 "block size (%d)", clustersize, blocksize);
			goto failed_mount;
		}
		sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
			le32_to_cpu(es->s_log_block_size);
		sbi->s_clusters_per_group =
			le32_to_cpu(es->s_clusters_per_group);
		if (sbi->s_clusters_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#clusters per group too big: %lu",
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
		if (sbi->s_blocks_per_group !=
		    (sbi->s_clusters_per_group * (clustersize / blocksize))) {
			ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
				 "clusters per group (%lu) inconsistent",
				 sbi->s_blocks_per_group,
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
	} else {
		if (clustersize != blocksize) {
			ext4_warning(sb, "fragment/cluster size (%d) != "
				     "block size (%d)", clustersize,
				     blocksize);
			clustersize = blocksize;
		}
		if (sbi->s_blocks_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#blocks per group too big: %lu",
				 sbi->s_blocks_per_group);
			goto failed_mount;
		}
		sbi->s_clusters_per_group = sbi->s_blocks_per_group;
		sbi->s_cluster_bits = 0;
3785
	}
3786 3787
	sbi->s_cluster_ratio = clustersize / blocksize;

3788
	if (sbi->s_inodes_per_group > blocksize * 8) {
3789 3790
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3791
		       sbi->s_inodes_per_group);
3792 3793 3794
		goto failed_mount;
	}

3795 3796 3797 3798
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3799 3800 3801 3802
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3803
	err = generic_check_addressable(sb->s_blocksize_bits,
3804
					ext4_blocks_count(es));
3805
	if (err) {
3806
		ext4_msg(sb, KERN_ERR, "filesystem"
3807
			 " too large to mount safely on this system");
3808
		if (sizeof(sector_t) < 8)
3809
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3810 3811 3812
		goto failed_mount;
	}

3813 3814
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3815

3816 3817 3818
	/* check blocks count against device size */
	blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3819 3820
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3821 3822 3823 3824
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3825 3826 3827 3828 3829
	/*
	 * It makes no sense for the first data block to be beyond the end
	 * of the filesystem.
	 */
	if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3830
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3831 3832 3833
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3834 3835
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3836 3837 3838 3839
	blocks_count = (ext4_blocks_count(es) -
			le32_to_cpu(es->s_first_data_block) +
			EXT4_BLOCKS_PER_GROUP(sb) - 1);
	do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3840
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3841
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3842
		       "(block count %llu, first data block %u, "
3843
		       "blocks per group %lu)", sbi->s_groups_count,
3844 3845 3846 3847 3848
		       ext4_blocks_count(es),
		       le32_to_cpu(es->s_first_data_block),
		       EXT4_BLOCKS_PER_GROUP(sb));
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3849
	sbi->s_groups_count = blocks_count;
3850 3851
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3852 3853
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3854 3855 3856
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3857
	if (sbi->s_group_desc == NULL) {
3858
		ext4_msg(sb, KERN_ERR, "not enough memory");
3859
		ret = -ENOMEM;
3860 3861 3862
		goto failed_mount;
	}

3863 3864
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3865

3866 3867 3868 3869
	if (sbi->s_proc)
		proc_create_data("options", S_IRUGO, sbi->s_proc,
				 &ext4_seq_options_fops, sb);

3870
	bgl_lock_init(sbi->s_blockgroup_lock);
3871 3872

	for (i = 0; i < db_count; i++) {
3873
		block = descriptor_loc(sb, logical_sb_block, i);
3874 3875
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
3876 3877
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3878 3879 3880 3881
			db_count = i;
			goto failed_mount2;
		}
	}
3882
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3883
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3884
		goto failed_mount2;
3885
	}
3886 3887
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		if (!ext4_fill_flex_info(sb)) {
3888 3889 3890
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
3891
			goto failed_mount2;
3892 3893
		}

3894
	sbi->s_gdb_count = db_count;
3895 3896 3897
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3898 3899 3900 3901
	init_timer(&sbi->s_err_report);
	sbi->s_err_report.function = print_daily_error_info;
	sbi->s_err_report.data = (unsigned long) sb;

3902
	/* Register extent status tree shrinker */
3903
	ext4_es_register_shrinker(sbi);
3904

3905
	err = percpu_counter_init(&sbi->s_freeclusters_counter,
3906
			ext4_count_free_clusters(sb));
3907 3908 3909 3910 3911 3912 3913 3914 3915
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext4_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext4_count_dirs(sb));
	}
	if (!err) {
3916
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3917
	}
3918 3919 3920
	if (!err) {
		err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
	}
3921 3922 3923 3924 3925
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount3;
	}

3926
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3927
	sbi->s_extent_max_zeroout_kb = 32;
3928

3929 3930 3931 3932 3933 3934 3935 3936
	/*
	 * set up enough so that it can read an inode
	 */
	if (!test_opt(sb, NOLOAD) &&
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		sb->s_op = &ext4_sops;
	else
		sb->s_op = &ext4_nojournal_sops;
3937 3938
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3939
#ifdef CONFIG_QUOTA
3940
	sb->dq_op = &ext4_quota_operations;
3941
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3942
		sb->s_qcop = &ext4_qctl_sysfile_operations;
3943 3944
	else
		sb->s_qcop = &ext4_qctl_operations;
3945
#endif
3946 3947
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3948
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3949
	mutex_init(&sbi->s_orphan_lock);
3950 3951 3952 3953

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3954 3955
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3956

3957 3958 3959 3960 3961
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
	    !(sb->s_flags & MS_RDONLY))
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
			goto failed_mount3;

3962 3963 3964 3965 3966
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
	if (!test_opt(sb, NOLOAD) &&
3967 3968
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3969
			goto failed_mount3;
3970 3971
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3972 3973
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3974
		goto failed_mount_wq;
3975
	} else {
3976
		clear_opt(sb, DATA_FLAGS);
3977 3978 3979
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3980 3981
	}

3982
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3983 3984
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3985
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3986
		goto failed_mount_wq;
3987 3988
	}

3989 3990 3991 3992
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3993
	}
3994

3995 3996 3997 3998 3999
	/* We have now updated the journal if required, so we can
	 * validate the data journaling mode. */
	switch (test_opt(sb, DATA_FLAGS)) {
	case 0:
		/* No mode set, assume a default based on the journal
A
Andrew Morton 已提交
4000 4001 4002
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
4003 4004
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
4005
			set_opt(sb, ORDERED_DATA);
4006
		else
4007
			set_opt(sb, JOURNAL_DATA);
4008 4009
		break;

4010 4011
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
4012 4013
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4014 4015
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
4016
			goto failed_mount_wq;
4017 4018 4019 4020
		}
	default:
		break;
	}
4021
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4022

B
Bobi Jam 已提交
4023 4024
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

4025 4026 4027 4028
	/*
	 * The journal may have updated the bg summary counts, so we
	 * need to update the global counters.
	 */
4029
	percpu_counter_set(&sbi->s_freeclusters_counter,
4030
			   ext4_count_free_clusters(sb));
4031 4032 4033 4034
	percpu_counter_set(&sbi->s_freeinodes_counter,
			   ext4_count_free_inodes(sb));
	percpu_counter_set(&sbi->s_dirs_counter,
			   ext4_count_dirs(sb));
4035
	percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
4036

4037
no_journal:
4038 4039 4040 4041 4042 4043 4044 4045
	if (ext4_mballoc_ready) {
		sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
		if (!sbi->s_mb_cache) {
			ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
			goto failed_mount_wq;
		}
	}

4046 4047 4048 4049 4050 4051 4052
	/*
	 * Get the # of file system overhead blocks from the
	 * superblock if present.
	 */
	if (es->s_overhead_clusters)
		sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
	else {
4053 4054
		err = ext4_calculate_overhead(sb);
		if (err)
4055 4056 4057
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
4058 4059 4060 4061
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
4062 4063 4064 4065
	EXT4_SB(sb)->rsv_conversion_wq =
		alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
	if (!EXT4_SB(sb)->rsv_conversion_wq) {
		printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4066
		ret = -ENOMEM;
4067 4068 4069
		goto failed_mount4;
	}

4070
	/*
4071
	 * The jbd2_journal_load will have done any necessary log recovery,
4072 4073 4074
	 * so we can safely mount the rest of the filesystem now.
	 */

4075 4076
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4077
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4078
		ret = PTR_ERR(root);
4079
		root = NULL;
4080 4081 4082
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4083
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4084
		iput(root);
4085 4086
		goto failed_mount4;
	}
4087
	sb->s_root = d_make_root(root);
4088
	if (!sb->s_root) {
4089
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4090 4091 4092
		ret = -ENOMEM;
		goto failed_mount4;
	}
4093

4094 4095
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117

	/* determine the minimum size of new large inodes, if present */
	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						     EXT4_GOOD_OLD_INODE_SIZE;
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_want_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_want_extra_isize);
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_min_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_min_extra_isize);
		}
	}
	/* Check if enough inode space is available */
	if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
							sbi->s_inode_size) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						       EXT4_GOOD_OLD_INODE_SIZE;
4118 4119
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4120 4121
	}

4122
	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
L
Lukas Czerner 已提交
4123 4124
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4125
			 "reserved pool", ext4_calculate_resv_clusters(sb));
4126
		goto failed_mount4a;
L
Lukas Czerner 已提交
4127 4128
	}

4129 4130
	err = ext4_setup_system_zone(sb);
	if (err) {
4131
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4132
			 "zone (%d)", err);
4133 4134 4135 4136 4137 4138 4139 4140
		goto failed_mount4a;
	}

	ext4_ext_init(sb);
	err = ext4_mb_init(sb);
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
			 err);
4141
		goto failed_mount5;
4142 4143
	}

4144 4145
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4146
		goto failed_mount6;
4147

T
Theodore Ts'o 已提交
4148 4149 4150 4151
	sbi->s_kobj.kset = ext4_kset;
	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
				   "%s", sb->s_id);
4152 4153
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4154

4155 4156 4157 4158 4159 4160 4161 4162 4163 4164
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    !(sb->s_flags & MS_RDONLY)) {
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

4165 4166 4167
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4168
	if (needs_recovery) {
4169
		ext4_msg(sb, KERN_INFO, "recovery complete");
4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181
		ext4_mark_recovery_complete(sb, es);
	}
	if (EXT4_SB(sb)->s_journal) {
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			descr = " journalled data mode";
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			descr = " ordered data mode";
		else
			descr = " writeback data mode";
	} else
		descr = "out journal";

4182 4183 4184 4185 4186 4187 4188 4189
	if (test_opt(sb, DISCARD)) {
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		if (!blk_queue_discard(q))
			ext4_msg(sb, KERN_WARNING,
				 "mounting with \"discard\" option, but "
				 "the device does not support discard");
	}

4190
	ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4191 4192
		 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
		 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4193

4194 4195
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4196

4197 4198 4199 4200 4201
	/* Enable message ratelimiting. Default is 10 messages per 5 secs. */
	ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
	ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
	ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);

4202
	kfree(orig_data);
4203 4204
	return 0;

4205
cantfind_ext4:
4206
	if (!silent)
4207
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4208 4209
	goto failed_mount;

4210 4211 4212 4213
#ifdef CONFIG_QUOTA
failed_mount8:
	kobject_del(&sbi->s_kobj);
#endif
4214 4215 4216
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4217
	ext4_mb_release(sb);
4218
failed_mount5:
4219 4220 4221
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4222
	dput(sb->s_root);
4223
	sb->s_root = NULL;
A
Al Viro 已提交
4224
failed_mount4:
4225
	ext4_msg(sb, KERN_ERR, "mount failed");
4226 4227
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4228
failed_mount_wq:
4229 4230 4231 4232
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4233
failed_mount3:
4234
	ext4_es_unregister_shrinker(sbi);
4235
	del_timer_sync(&sbi->s_err_report);
4236 4237
	if (sbi->s_flex_groups)
		ext4_kvfree(sbi->s_flex_groups);
4238
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
4239 4240
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
4241
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4242
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4243 4244
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4245 4246 4247
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
4248
	ext4_kvfree(sbi->s_group_desc);
4249
failed_mount:
4250 4251
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4252
	if (sbi->s_proc) {
4253
		remove_proc_entry("options", sbi->s_proc);
4254
		remove_proc_entry(sb->s_id, ext4_proc_root);
4255
	}
4256 4257 4258 4259
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif
4260
	ext4_blkdev_remove(sbi);
4261 4262 4263
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4264
	kfree(sbi->s_blockgroup_lock);
4265
	kfree(sbi);
4266
out_free_orig:
4267
	kfree(orig_data);
4268
	return err ? err : ret;
4269 4270 4271 4272 4273 4274 4275
}

/*
 * Setup any per-fs journal parameters now.  We'll do this both on
 * initial mount, once the journal has been initialised but before we've
 * done any recovery; and again on any subsequent remount.
 */
4276
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4277
{
4278
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4279

4280 4281 4282
	journal->j_commit_interval = sbi->s_commit_interval;
	journal->j_min_batch_time = sbi->s_min_batch_time;
	journal->j_max_batch_time = sbi->s_max_batch_time;
4283

4284
	write_lock(&journal->j_state_lock);
4285
	if (test_opt(sb, BARRIER))
4286
		journal->j_flags |= JBD2_BARRIER;
4287
	else
4288
		journal->j_flags &= ~JBD2_BARRIER;
4289 4290 4291 4292
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4293
	write_unlock(&journal->j_state_lock);
4294 4295
}

4296
static journal_t *ext4_get_journal(struct super_block *sb,
4297 4298 4299 4300 4301
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4302 4303
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4304 4305 4306 4307
	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

4308 4309
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4310
		ext4_msg(sb, KERN_ERR, "no journal found");
4311 4312 4313 4314 4315
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4316
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4317 4318 4319
		return NULL;
	}

4320
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4321
		  journal_inode, journal_inode->i_size);
4322
	if (!S_ISREG(journal_inode->i_mode)) {
4323
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4324 4325 4326 4327
		iput(journal_inode);
		return NULL;
	}

4328
	journal = jbd2_journal_init_inode(journal_inode);
4329
	if (!journal) {
4330
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4331 4332 4333 4334
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4335
	ext4_init_journal_params(sb, journal);
4336 4337 4338
	return journal;
}

4339
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4340 4341
				       dev_t j_dev)
{
4342
	struct buffer_head *bh;
4343
	journal_t *journal;
4344 4345
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4346
	int hblock, blocksize;
4347
	ext4_fsblk_t sb_block;
4348
	unsigned long offset;
4349
	struct ext4_super_block *es;
4350 4351
	struct block_device *bdev;

4352 4353
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4354
	bdev = ext4_blkdev_get(j_dev, sb);
4355 4356 4357 4358
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4359
	hblock = bdev_logical_block_size(bdev);
4360
	if (blocksize < hblock) {
4361 4362
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4363 4364 4365
		goto out_bdev;
	}

4366 4367
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4368 4369
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4370 4371
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4372 4373 4374
		goto out_bdev;
	}

4375
	es = (struct ext4_super_block *) (bh->b_data + offset);
4376
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4377
	    !(le32_to_cpu(es->s_feature_incompat) &
4378
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4379 4380
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4381 4382 4383 4384
		brelse(bh);
		goto out_bdev;
	}

4385
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4386
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4387 4388 4389 4390
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4391
	len = ext4_blocks_count(es);
4392 4393 4394
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4395
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4396 4397
					start, len, blocksize);
	if (!journal) {
4398
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4399 4400 4401
		goto out_bdev;
	}
	journal->j_private = sb;
4402
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4403 4404
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4405
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4406 4407 4408
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4409 4410
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4411 4412 4413
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4414 4415
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4416
	return journal;
4417

4418
out_journal:
4419
	jbd2_journal_destroy(journal);
4420
out_bdev:
4421
	ext4_blkdev_put(bdev);
4422 4423 4424
	return NULL;
}

4425 4426
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4427 4428 4429 4430 4431 4432 4433 4434
			     unsigned long journal_devnum)
{
	journal_t *journal;
	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
	dev_t journal_dev;
	int err = 0;
	int really_read_only;

4435 4436
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4437 4438
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4439 4440
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451
		journal_dev = new_decode_dev(journal_devnum);
	} else
		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));

	really_read_only = bdev_read_only(sb->s_bdev);

	/*
	 * Are we loading a blank journal or performing recovery after a
	 * crash?  For recovery, we need to check in advance whether we
	 * can get read-write access to the device.
	 */
4452
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4453
		if (sb->s_flags & MS_RDONLY) {
4454 4455
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4456
			if (really_read_only) {
4457 4458
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4459 4460
				return -EROFS;
			}
4461 4462
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4463 4464 4465 4466
		}
	}

	if (journal_inum && journal_dev) {
4467 4468
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4469 4470 4471 4472
		return -EINVAL;
	}

	if (journal_inum) {
4473
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4474 4475
			return -EINVAL;
	} else {
4476
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4477 4478 4479
			return -EINVAL;
	}

4480
	if (!(journal->j_flags & JBD2_BARRIER))
4481
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4482

4483
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4484
		err = jbd2_journal_wipe(journal, !really_read_only);
4485 4486 4487 4488 4489
	if (!err) {
		char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
		if (save)
			memcpy(save, ((char *) es) +
			       EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4490
		err = jbd2_journal_load(journal);
4491 4492 4493 4494 4495
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4496 4497

	if (err) {
4498
		ext4_msg(sb, KERN_ERR, "error loading journal");
4499
		jbd2_journal_destroy(journal);
4500 4501 4502
		return err;
	}

4503 4504
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4505

4506
	if (!really_read_only && journal_devnum &&
4507 4508 4509 4510
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		es->s_journal_dev = cpu_to_le32(journal_devnum);

		/* Make sure we flush the recovery flag to disk. */
4511
		ext4_commit_super(sb, 1);
4512 4513 4514 4515 4516
	}

	return 0;
}

4517
static int ext4_commit_super(struct super_block *sb, int sync)
4518
{
4519
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4520
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4521
	int error = 0;
4522

4523
	if (!sbh || block_device_ejected(sb))
4524
		return error;
4525 4526 4527 4528 4529 4530 4531 4532 4533
	if (buffer_write_io_error(sbh)) {
		/*
		 * Oh, dear.  A previous attempt to write the
		 * superblock failed.  This could happen because the
		 * USB device was yanked out.  Or it could happen to
		 * be a transient write error and maybe the block will
		 * be remapped.  Nothing we can do but to retry the
		 * write and hope for the best.
		 */
4534 4535
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4536 4537 4538
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550
	/*
	 * If the file system is mounted read-only, don't update the
	 * superblock write time.  This avoids updating the superblock
	 * write time when we are mounting the root file system
	 * read/only but we need to replay the journal; at that point,
	 * for people who are east of GMT and who make their clock
	 * tick in localtime for Windows bug-for-bug compatibility,
	 * the clock is set in the future, and this will cause e2fsck
	 * to complain and force a full file system check.
	 */
	if (!(sb->s_flags & MS_RDONLY))
		es->s_wtime = cpu_to_le32(get_seconds());
4551 4552 4553
	if (sb->s_bdev->bd_part)
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
T
Theodore Ts'o 已提交
4554 4555
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4556 4557 4558
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4559 4560 4561
	ext4_free_blocks_count_set(es,
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4562 4563 4564
	es->s_free_inodes_count =
		cpu_to_le32(percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeinodes_counter));
4565
	BUFFER_TRACE(sbh, "marking dirty");
4566
	ext4_superblock_csum_set(sb);
4567
	mark_buffer_dirty(sbh);
4568
	if (sync) {
4569 4570 4571 4572 4573 4574
		error = sync_dirty_buffer(sbh);
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4575 4576
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4577 4578 4579 4580
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4581
	return error;
4582 4583 4584 4585 4586 4587 4588
}

/*
 * Have we just finished recovery?  If so, and if we are mounting (or
 * remounting) the filesystem readonly, then we will end up with a
 * consistent fs on disk.  Record that fact.
 */
4589 4590
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4591
{
4592
	journal_t *journal = EXT4_SB(sb)->s_journal;
4593

4594 4595 4596 4597
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4598
	jbd2_journal_lock_updates(journal);
4599 4600 4601
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4602
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4603
	    sb->s_flags & MS_RDONLY) {
4604
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4605
		ext4_commit_super(sb, 1);
4606
	}
4607 4608

out:
4609
	jbd2_journal_unlock_updates(journal);
4610 4611 4612 4613 4614 4615 4616
}

/*
 * If we are mounting (or read-write remounting) a filesystem whose journal
 * has recorded an error from a previous lifetime, move that error to the
 * main filesystem now.
 */
4617 4618
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4619 4620 4621 4622 4623
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4624 4625
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4626
	journal = EXT4_SB(sb)->s_journal;
4627 4628 4629

	/*
	 * Now check for any error status which may have been recorded in the
4630
	 * journal by a prior ext4_error() or ext4_abort()
4631 4632
	 */

4633
	j_errno = jbd2_journal_errno(journal);
4634 4635 4636
	if (j_errno) {
		char nbuf[16];

4637
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4638
		ext4_warning(sb, "Filesystem error recorded "
4639
			     "from previous mount: %s", errstr);
4640
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4641

4642 4643
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4644
		ext4_commit_super(sb, 1);
4645

4646
		jbd2_journal_clear_err(journal);
4647
		jbd2_journal_update_sb_errno(journal);
4648 4649 4650 4651 4652 4653 4654
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4655
int ext4_force_commit(struct super_block *sb)
4656 4657 4658 4659 4660 4661
{
	journal_t *journal;

	if (sb->s_flags & MS_RDONLY)
		return 0;

4662
	journal = EXT4_SB(sb)->s_journal;
4663
	return ext4_journal_force_commit(journal);
4664 4665
}

4666
static int ext4_sync_fs(struct super_block *sb, int wait)
4667
{
4668
	int ret = 0;
4669
	tid_t target;
4670
	bool needs_barrier = false;
4671
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4672

4673
	trace_ext4_sync_fs(sb, wait);
4674
	flush_workqueue(sbi->rsv_conversion_wq);
4675 4676 4677 4678 4679
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4680 4681 4682 4683 4684 4685 4686 4687 4688 4689
	/*
	 * Data writeback is possible w/o journal transaction, so barrier must
	 * being sent at the end of the function. But we can skip it if
	 * transaction_commit will do it for us.
	 */
	target = jbd2_get_latest_transaction(sbi->s_journal);
	if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
	    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
		needs_barrier = true;

4690
	if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4691
		if (wait)
4692 4693 4694 4695 4696 4697 4698
			ret = jbd2_log_wait_commit(sbi->s_journal, target);
	}
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4699
	}
4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713

	return ret;
}

static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
{
	int ret = 0;

	trace_ext4_sync_fs(sb, wait);
	flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
	dquot_writeback_dquots(sb, -1);
	if (wait && test_opt(sb, BARRIER))
		ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);

4714
	return ret;
4715 4716 4717 4718 4719
}

/*
 * LVM calls this function before a (read-only) snapshot is created.  This
 * gives us a chance to flush the journal completely and mark the fs clean.
4720 4721
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4722 4723
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4724
 */
4725
static int ext4_freeze(struct super_block *sb)
4726
{
4727 4728
	int error = 0;
	journal_t *journal;
4729

4730 4731
	if (sb->s_flags & MS_RDONLY)
		return 0;
4732

4733
	journal = EXT4_SB(sb)->s_journal;
4734

4735 4736
	/* Now we set up the journal barrier. */
	jbd2_journal_lock_updates(journal);
4737

4738 4739 4740 4741 4742
	/*
	 * Don't clear the needs_recovery flag if we failed to flush
	 * the journal.
	 */
	error = jbd2_journal_flush(journal);
4743 4744
	if (error < 0)
		goto out;
4745 4746 4747 4748

	/* Journal blocked and flushed, clear needs_recovery flag. */
	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	error = ext4_commit_super(sb, 1);
4749
out:
4750
	/* we rely on upper layer to stop further updates */
4751 4752
	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	return error;
4753 4754 4755 4756 4757 4758
}

/*
 * Called by LVM after the snapshot is done.  We need to reset the RECOVER
 * flag here, even though the filesystem is not technically dirty yet.
 */
4759
static int ext4_unfreeze(struct super_block *sb)
4760
{
4761 4762 4763 4764 4765 4766
	if (sb->s_flags & MS_RDONLY)
		return 0;

	/* Reset the needs_recovery flag before the fs is unlocked. */
	EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	ext4_commit_super(sb, 1);
4767
	return 0;
4768 4769
}

4770 4771 4772 4773 4774
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4775
	unsigned long s_mount_opt2;
4776 4777
	kuid_t s_resuid;
	kgid_t s_resgid;
4778 4779 4780 4781 4782 4783 4784 4785
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
	char *s_qf_names[MAXQUOTAS];
#endif
};

4786
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4787
{
4788
	struct ext4_super_block *es;
4789
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4790
	unsigned long old_sb_flags;
4791
	struct ext4_mount_options old_opts;
4792
	int enable_quota = 0;
4793
	ext4_group_t g;
4794
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4795
	int err = 0;
4796
#ifdef CONFIG_QUOTA
4797
	int i, j;
4798
#endif
4799
	char *orig_data = kstrdup(data, GFP_KERNEL);
4800 4801 4802 4803

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4804
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4805 4806 4807
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4808 4809
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4810 4811 4812
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++)
4813 4814 4815 4816 4817 4818
		if (sbi->s_qf_names[i]) {
			old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
							 GFP_KERNEL);
			if (!old_opts.s_qf_names[i]) {
				for (j = 0; j < i; j++)
					kfree(old_opts.s_qf_names[j]);
4819
				kfree(orig_data);
4820 4821 4822 4823
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4824
#endif
4825 4826
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4827 4828 4829 4830

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
4831
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4832 4833 4834 4835
		err = -EINVAL;
		goto restore_opts;
	}

4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			err = -EINVAL;
			goto restore_opts;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dioread_nolock");
			err = -EINVAL;
			goto restore_opts;
		}
	}

4851
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4852
		ext4_abort(sb, "Abort forced by user");
4853 4854

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4855
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4856 4857 4858

	es = sbi->s_es;

4859
	if (sbi->s_journal) {
4860
		ext4_init_journal_params(sb, sbi->s_journal);
4861 4862
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4863

4864
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4865
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4866 4867 4868 4869 4870
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4871 4872 4873
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4874 4875
			err = dquot_suspend(sb, -1);
			if (err < 0)
4876 4877
				goto restore_opts;

4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888
			/*
			 * First of all, the unconditional stuff we have to do
			 * to disable replay of the journal when we next remount
			 */
			sb->s_flags |= MS_RDONLY;

			/*
			 * OK, test if we are remounting a valid rw partition
			 * readonly, and if so set the rdonly flag and then
			 * mark the partition as valid again.
			 */
4889 4890
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4891 4892
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4893
			if (sbi->s_journal)
4894
				ext4_mark_recovery_complete(sb, es);
4895
		} else {
4896 4897
			/* Make sure we can mount this feature set readwrite */
			if (!ext4_feature_set_ok(sb, 0)) {
4898 4899 4900
				err = -EROFS;
				goto restore_opts;
			}
4901 4902
			/*
			 * Make sure the group descriptor checksums
4903
			 * are sane.  If they aren't, refuse to remount r/w.
4904 4905 4906 4907 4908
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4909
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4910 4911
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4912 4913 4914 4915 4916 4917 4918
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

4919 4920 4921 4922 4923 4924
			/*
			 * If we have an unprocessed orphan list hanging
			 * around from a previously readonly bdev mount,
			 * require a full umount/remount for now.
			 */
			if (es->s_last_orphan) {
4925
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4926 4927
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4928
				       "umount/remount instead");
4929 4930 4931 4932
				err = -EINVAL;
				goto restore_opts;
			}

4933 4934 4935 4936 4937 4938
			/*
			 * Mounting a RDONLY partition read-write, so reread
			 * and store the current valid flag.  (It may have
			 * been changed by e2fsck since we originally mounted
			 * the partition.)
			 */
4939 4940
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4941
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4942
			if (!ext4_setup_super(sb, es, 0))
4943
				sb->s_flags &= ~MS_RDONLY;
4944 4945 4946 4947 4948 4949 4950
			if (EXT4_HAS_INCOMPAT_FEATURE(sb,
						     EXT4_FEATURE_INCOMPAT_MMP))
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4951
			enable_quota = 1;
4952 4953
		}
	}
4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966

	/*
	 * Reinitialize lazy itable initialization thread based on
	 * current settings
	 */
	if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
		ext4_unregister_li_request(sb);
	else {
		ext4_group_t first_not_zeroed;
		first_not_zeroed = ext4_has_uninit_itable(sb);
		ext4_register_li_request(sb, first_not_zeroed);
	}

4967
	ext4_setup_system_zone(sb);
4968
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4969
		ext4_commit_super(sb, 1);
4970

4971 4972 4973
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
	for (i = 0; i < MAXQUOTAS; i++)
4974
		kfree(old_opts.s_qf_names[i]);
4975 4976 4977 4978 4979 4980
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
		else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_QUOTA)) {
			err = ext4_enable_quotas(sb);
4981
			if (err)
4982 4983 4984
				goto restore_opts;
		}
	}
4985
#endif
4986 4987 4988

	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4989
	return 0;
4990

4991 4992 4993
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4994
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4995 4996 4997
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4998 4999
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
5000 5001 5002
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++) {
5003
		kfree(sbi->s_qf_names[i]);
5004 5005 5006
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
5007
	kfree(orig_data);
5008 5009 5010
	return err;
}

5011
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5012 5013
{
	struct super_block *sb = dentry->d_sb;
5014 5015
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5016
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5017
	u64 fsid;
5018
	s64 bfree;
L
Lukas Czerner 已提交
5019
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5020

5021 5022
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5023

5024
	buf->f_type = EXT4_SUPER_MAGIC;
5025
	buf->f_bsize = sb->s_blocksize;
5026
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5027 5028
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5029
	/* prevent underflow in case that few free space is available */
5030
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5031 5032 5033
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5034 5035
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5036
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5037
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5038 5039 5040 5041
	fsid = le64_to_cpup((void *)es->s_uuid) ^
	       le64_to_cpup((void *)es->s_uuid + sizeof(u64));
	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5042

5043 5044 5045
	return 0;
}

5046 5047
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5048
 * Process 1                         Process 2
5049
 * ext4_create()                     quota_sync()
5050
 *   jbd2_journal_start()                  write_dquot()
5051
 *   dquot_initialize()                         down(dqio_mutex)
5052
 *     down(dqio_mutex)                    jbd2_journal_start()
5053 5054 5055 5056 5057 5058 5059
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5060
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5061 5062
}

5063
static int ext4_write_dquot(struct dquot *dquot)
5064 5065 5066 5067 5068 5069
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5070
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5071
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5072 5073 5074
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5075
	err = ext4_journal_stop(handle);
5076 5077 5078 5079 5080
	if (!ret)
		ret = err;
	return ret;
}

5081
static int ext4_acquire_dquot(struct dquot *dquot)
5082 5083 5084 5085
{
	int ret, err;
	handle_t *handle;

5086
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5087
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5088 5089 5090
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5091
	err = ext4_journal_stop(handle);
5092 5093 5094 5095 5096
	if (!ret)
		ret = err;
	return ret;
}

5097
static int ext4_release_dquot(struct dquot *dquot)
5098 5099 5100 5101
{
	int ret, err;
	handle_t *handle;

5102
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5103
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5104 5105 5106
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5107
		return PTR_ERR(handle);
J
Jan Kara 已提交
5108
	}
5109
	ret = dquot_release(dquot);
5110
	err = ext4_journal_stop(handle);
5111 5112 5113 5114 5115
	if (!ret)
		ret = err;
	return ret;
}

5116
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5117
{
5118 5119 5120
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5121
	/* Are we journaling quotas? */
5122 5123
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5124
		dquot_mark_dquot_dirty(dquot);
5125
		return ext4_write_dquot(dquot);
5126 5127 5128 5129 5130
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5131
static int ext4_write_info(struct super_block *sb, int type)
5132 5133 5134 5135 5136
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5137
	handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5138 5139 5140
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5141
	err = ext4_journal_stop(handle);
5142 5143 5144 5145 5146 5147 5148 5149 5150
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5151
static int ext4_quota_on_mount(struct super_block *sb, int type)
5152
{
5153 5154
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5155 5156 5157 5158 5159
}

/*
 * Standard function to be called on quota_on
 */
5160
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5161
			 struct path *path)
5162 5163 5164 5165 5166
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5167

5168
	/* Quotafile not on the same filesystem? */
5169
	if (path->dentry->d_sb != sb)
5170
		return -EXDEV;
5171 5172
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5173
		/* Quotafile not in fs root? */
5174
		if (path->dentry->d_parent != sb->s_root)
5175 5176 5177
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5178
	}
5179 5180 5181 5182 5183

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5184
	if (EXT4_SB(sb)->s_journal &&
5185
	    ext4_should_journal_data(path->dentry->d_inode)) {
5186 5187 5188 5189 5190
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5191
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5192
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5193
		if (err)
5194
			return err;
5195 5196
	}

5197
	return dquot_quota_on(sb, type, format_id, path);
5198 5199
}

5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
	unsigned long qf_inums[MAXQUOTAS] = {
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));

	if (!qf_inums[type])
		return -EPERM;

	qf_inode = ext4_iget(sb, qf_inums[type]);
	if (IS_ERR(qf_inode)) {
		ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
		return PTR_ERR(qf_inode);
	}

J
Jan Kara 已提交
5221 5222
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);

	return err;
}

/* Enable usage tracking for all quota types. */
static int ext4_enable_quotas(struct super_block *sb)
{
	int type, err = 0;
	unsigned long qf_inums[MAXQUOTAS] = {
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
	for (type = 0; type < MAXQUOTAS; type++) {
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5245 5246 5247
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269
				return err;
			}
		}
	}
	return 0;
}

/*
 * quota_on function that is used when QUOTA feature is set.
 */
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
		return -EINVAL;

	/*
	 * USAGE was enabled at mount time. Only need to enable LIMITS now.
	 */
	return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
}

5270 5271
static int ext4_quota_off(struct super_block *sb, int type)
{
5272 5273 5274
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5275 5276 5277
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5278 5279
		sync_filesystem(sb);

5280 5281 5282
	if (!inode)
		goto out;

5283 5284
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5285
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5286 5287 5288 5289 5290 5291 5292
	if (IS_ERR(handle))
		goto out;
	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	ext4_mark_inode_dirty(handle, inode);
	ext4_journal_stop(handle);

out:
5293 5294 5295
	return dquot_quota_off(sb, type);
}

5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307
/*
 * quota_off function that is used when QUOTA feature is set.
 */
static int ext4_quota_off_sysfile(struct super_block *sb, int type)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
		return -EINVAL;

	/* Disable only the limits. */
	return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
}

5308 5309
/* Read data from quotafile - avoid pagecache and such because we cannot afford
 * acquiring the locks... As quota files are never truncated and quota code
L
Lucas De Marchi 已提交
5310
 * itself serializes the operations (and no one else should touch the files)
5311
 * we don't have to be afraid of races */
5312
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5313 5314 5315
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5316
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	size_t toread;
	struct buffer_head *bh;
	loff_t i_size = i_size_read(inode);

	if (off > i_size)
		return 0;
	if (off+len > i_size)
		len = i_size-off;
	toread = len;
	while (toread > 0) {
		tocopy = sb->s_blocksize - offset < toread ?
				sb->s_blocksize - offset : toread;
5332
		bh = ext4_bread(NULL, inode, blk, 0, &err);
5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349
		if (err)
			return err;
		if (!bh)	/* A hole? */
			memset(data, 0, tocopy);
		else
			memcpy(data, bh->b_data+offset, tocopy);
		brelse(bh);
		offset = 0;
		toread -= tocopy;
		data += tocopy;
		blk++;
	}
	return len;
}

/* Write to quotafile (we know the transaction is already started and has
 * enough credits) */
5350
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5351 5352 5353
				const char *data, size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5354
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5355 5356 5357 5358 5359
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5360
	if (EXT4_SB(sb)->s_journal && !handle) {
5361 5362
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5363 5364 5365
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379
	/*
	 * Since we account only one data block in transaction credits,
	 * then it is impossible to cross a block boundary.
	 */
	if (sb->s_blocksize - offset < len) {
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because not block aligned",
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}

	bh = ext4_bread(handle, inode, blk, 1, &err);
	if (!bh)
		goto out;
5380
	BUFFER_TRACE(bh, "get write access");
5381 5382 5383 5384
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
		goto out;
5385
	}
5386 5387 5388 5389
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5390
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5391
	brelse(bh);
5392
out:
5393
	if (err)
5394
		return err;
5395 5396
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5397
		EXT4_I(inode)->i_disksize = inode->i_size;
5398
		ext4_mark_inode_dirty(handle, inode);
5399
	}
5400
	return len;
5401 5402 5403 5404
}

#endif

A
Al Viro 已提交
5405 5406
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5407
{
A
Al Viro 已提交
5408
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5409 5410
}

5411
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423
static inline void register_as_ext2(void)
{
	int err = register_filesystem(&ext2_fs_type);
	if (err)
		printk(KERN_WARNING
		       "EXT4-fs: Unable to register as ext2 (%d)\n", err);
}

static inline void unregister_as_ext2(void)
{
	unregister_filesystem(&ext2_fs_type);
}
5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434

static inline int ext2_feature_set_ok(struct super_block *sb)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
		return 0;
	return 1;
}
5435 5436 5437
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5438
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5439 5440
#endif

5441
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453
static inline void register_as_ext3(void)
{
	int err = register_filesystem(&ext3_fs_type);
	if (err)
		printk(KERN_WARNING
		       "EXT4-fs: Unable to register as ext3 (%d)\n", err);
}

static inline void unregister_as_ext3(void)
{
	unregister_filesystem(&ext3_fs_type);
}
5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466

static inline int ext3_feature_set_ok(struct super_block *sb)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
		return 0;
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
		return 0;
	return 1;
}
5467 5468 5469
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }
5470
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5471 5472
#endif

T
Theodore Ts'o 已提交
5473 5474 5475
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5476
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5477 5478 5479
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5480
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5481

5482
static int __init ext4_init_feat_adverts(void)
5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505
{
	struct ext4_features *ef;
	int ret = -ENOMEM;

	ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
	if (!ef)
		goto out;

	ef->f_kobj.kset = ext4_kset;
	init_completion(&ef->f_kobj_unregister);
	ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
				   "features");
	if (ret) {
		kfree(ef);
		goto out;
	}

	ext4_feat = ef;
	ret = 0;
out:
	return ret;
}

5506 5507 5508 5509 5510 5511 5512
static void ext4_exit_feat_adverts(void)
{
	kobject_put(&ext4_feat->f_kobj);
	wait_for_completion(&ext4_feat->f_kobj_unregister);
	kfree(ext4_feat);
}

5513 5514 5515 5516
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];

5517
static int __init ext4_init_fs(void)
5518
{
5519
	int i, err;
5520

5521 5522 5523
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5524
	/* Build-time check for flags consistency */
5525
	ext4_check_flag_values();
5526 5527 5528 5529 5530 5531

	for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
		mutex_init(&ext4__aio_mutex[i]);
		init_waitqueue_head(&ext4__ioend_wq[i]);
	}

5532
	err = ext4_init_es();
5533 5534
	if (err)
		return err;
5535 5536 5537 5538 5539

	err = ext4_init_pageio();
	if (err)
		goto out7;

5540
	err = ext4_init_system_zone();
5541
	if (err)
5542
		goto out6;
T
Theodore Ts'o 已提交
5543
	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5544 5545
	if (!ext4_kset) {
		err = -ENOMEM;
T
Theodore Ts'o 已提交
5546
		goto out5;
5547
	}
5548
	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5549 5550

	err = ext4_init_feat_adverts();
T
Theodore Ts'o 已提交
5551 5552
	if (err)
		goto out4;
5553

5554
	err = ext4_init_mballoc();
5555 5556
	if (err)
		goto out2;
5557 5558
	else
		ext4_mballoc_ready = 1;
5559 5560 5561
	err = init_inodecache();
	if (err)
		goto out1;
5562
	register_as_ext3();
5563
	register_as_ext2();
T
Theodore Ts'o 已提交
5564
	err = register_filesystem(&ext4_fs_type);
5565 5566
	if (err)
		goto out;
5567

5568 5569
	return 0;
out:
5570 5571
	unregister_as_ext2();
	unregister_as_ext3();
5572 5573
	destroy_inodecache();
out1:
5574
	ext4_mballoc_ready = 0;
5575
	ext4_exit_mballoc();
5576
out2:
5577
	ext4_exit_feat_adverts();
T
Theodore Ts'o 已提交
5578
out4:
5579 5580
	if (ext4_proc_root)
		remove_proc_entry("fs/ext4", NULL);
5581
	kset_unregister(ext4_kset);
5582
out5:
5583
	ext4_exit_system_zone();
5584
out6:
5585
	ext4_exit_pageio();
5586 5587 5588
out7:
	ext4_exit_es();

5589 5590 5591
	return err;
}

5592
static void __exit ext4_exit_fs(void)
5593
{
5594
	ext4_destroy_lazyinit_thread();
5595 5596
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5597
	unregister_filesystem(&ext4_fs_type);
5598
	destroy_inodecache();
5599
	ext4_exit_mballoc();
5600
	ext4_exit_feat_adverts();
5601
	remove_proc_entry("fs/ext4", NULL);
T
Theodore Ts'o 已提交
5602
	kset_unregister(ext4_kset);
5603 5604
	ext4_exit_system_zone();
	ext4_exit_pageio();
5605
	ext4_exit_es();
5606 5607 5608
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5609
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5610
MODULE_LICENSE("GPL");
5611 5612
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)