super.c 150.1 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * 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>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/parser.h>
#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#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>
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#include <linux/ctype.h>
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#include <linux/log2.h>
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#include <linux/crc16.h>
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#include <linux/cleancache.h>
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#include <asm/uaccess.h>

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#include <linux/kthread.h>
#include <linux/freezer.h>

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#include "ext4.h"
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#include "ext4_extents.h"	/* Needed for trace points definition */
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#include "ext4_jbd2.h"
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#include "xattr.h"
#include "acl.h"
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#include "mballoc.h"
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#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>

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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
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static int ext4_mballoc_ready;
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static struct ratelimit_state ext4_mount_msg_ratelimit;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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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);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
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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,
};
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MODULE_ALIAS_FS("ext2");
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MODULE_ALIAS("ext2");
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


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static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
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	.mount		= ext4_mount,
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	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext3");
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MODULE_ALIAS("ext3");
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#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
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static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
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	if (!ext4_has_feature_metadata_csum(sb))
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		return 1;

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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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);
}

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static int ext4_superblock_csum_verify(struct super_block *sb,
				       struct ext4_super_block *es)
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{
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	if (!ext4_has_metadata_csum(sb))
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		return 1;

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

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

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	if (!ext4_has_metadata_csum(sb))
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		return;

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

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void *ext4_kvmalloc(size_t size, gfp_t flags)
{
	void *ret;

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	ret = kmalloc(size, flags | __GFP_NOWARN);
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	if (!ret)
		ret = __vmalloc(size, flags, PAGE_KERNEL);
	return ret;
}

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

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	ret = kzalloc(size, flags | __GFP_NOWARN);
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	if (!ret)
		ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
	return ret;
}

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ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
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{
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	return le32_to_cpu(bg->bg_block_bitmap_lo) |
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		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
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}

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ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
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{
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	return le32_to_cpu(bg->bg_inode_bitmap_lo) |
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		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
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}

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ext4_fsblk_t ext4_inode_table(struct super_block *sb,
			      struct ext4_group_desc *bg)
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{
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	return le32_to_cpu(bg->bg_inode_table_lo) |
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		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
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}

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__u32 ext4_free_group_clusters(struct super_block *sb,
			       struct ext4_group_desc *bg)
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{
	return le16_to_cpu(bg->bg_free_blocks_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
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}

__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 ?
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		 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
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}

__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 ?
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		 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
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}

__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 ?
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		 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
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}

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void ext4_block_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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	bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
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	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
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}

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void ext4_inode_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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	bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
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	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
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}

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void ext4_inode_table_set(struct super_block *sb,
			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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	bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
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	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
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}

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void ext4_free_group_clusters_set(struct super_block *sb,
				  struct ext4_group_desc *bg, __u32 count)
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{
	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);
}

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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;
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	if (bdev_read_only(sb->s_bdev))
		return;
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	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;
	}
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	/*
	 * 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);
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	le32_add_cpu(&es->s_error_count, 1);
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}

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);
}

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/*
 * 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 = inode_to_bdi(bd_inode);

	return bdi->dev == NULL;
}

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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);
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	struct ext4_journal_cb_entry	*jce;
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	BUG_ON(txn->t_state == T_FINISHED);
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	spin_lock(&sbi->s_md_lock);
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	while (!list_empty(&txn->t_private_list)) {
		jce = list_entry(txn->t_private_list.next,
				 struct ext4_journal_cb_entry, jce_list);
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		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);
}
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/* 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
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 * superblock.  That is not possible on ext4, because we may have other
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 * 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.
 *
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 * We'll just use the jbd2_journal_abort() error code to record an error in
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 * the journal instead.  On recovery, the journal will complain about
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 * that error until we've noted it down and cleared it.
 */

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static void ext4_handle_error(struct super_block *sb)
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{
	if (sb->s_flags & MS_RDONLY)
		return;

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	if (!test_opt(sb, ERRORS_CONT)) {
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		journal_t *journal = EXT4_SB(sb)->s_journal;
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		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
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		if (journal)
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			jbd2_journal_abort(journal, -EIO);
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	}
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	if (test_opt(sb, ERRORS_RO)) {
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		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
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		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
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		sb->s_flags |= MS_RDONLY;
	}
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	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
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		panic("EXT4-fs (device %s): panic forced after error\n",
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			sb->s_id);
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	}
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}

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

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void __ext4_error(struct super_block *sb, const char *function,
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		  unsigned int line, const char *fmt, ...)
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{
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	struct va_format vaf;
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	va_list args;

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	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);
	}
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	save_error_info(sb, function, line);
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	ext4_handle_error(sb);
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}

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void __ext4_error_inode(struct inode *inode, const char *function,
			unsigned int line, ext4_fsblk_t block,
			const char *fmt, ...)
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{
	va_list args;
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	struct va_format vaf;
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	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
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	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	es->s_last_error_block = cpu_to_le64(block);
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	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);
	}
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	save_error_info(inode->i_sb, function, line);
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	ext4_handle_error(inode->i_sb);
}

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void __ext4_error_file(struct file *file, const char *function,
		       unsigned int line, ext4_fsblk_t block,
		       const char *fmt, ...)
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{
	va_list args;
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	struct va_format vaf;
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	struct ext4_super_block *es;
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	struct inode *inode = file_inode(file);
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	char pathname[80], *path;

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	es = EXT4_SB(inode->i_sb)->s_es;
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
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	if (ext4_error_ratelimit(inode->i_sb)) {
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		path = file_path(file, pathname, sizeof(pathname));
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		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);
	}
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	save_error_info(inode->i_sb, function, line);
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	ext4_handle_error(inode->i_sb);
}

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const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
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{
	char *errstr = NULL;

	switch (errno) {
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	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
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	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
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		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
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			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;
}

530
/* __ext4_std_error decodes expected errors from journaling functions
531 532
 * automatically and invokes the appropriate error response.  */

533 534
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
535 536 537 538 539 540 541 542 543 544 545
{
	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;

546 547 548 549 550
	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);
	}
551

552
	save_error_info(sb, function, line);
553
	ext4_handle_error(sb);
554 555 556
}

/*
557
 * ext4_abort is a much stronger failure handler than ext4_error.  The
558 559 560 561 562 563 564 565
 * 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.
 */

566
void __ext4_abort(struct super_block *sb, const char *function,
567
		unsigned int line, const char *fmt, ...)
568 569 570
{
	va_list args;

571
	save_error_info(sb, function, line);
572
	va_start(args, fmt);
573 574
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
575 576 577 578
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

579 580 581
	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;
582 583 584 585 586 587
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
588 589 590 591
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
592 593 594 595
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
596
		panic("EXT4-fs panic from previous error\n");
597
	}
598 599
}

600 601
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
602
{
J
Joe Perches 已提交
603
	struct va_format vaf;
604 605
	va_list args;

606 607 608
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

609
	va_start(args, fmt);
J
Joe Perches 已提交
610 611 612
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
613 614 615
	va_end(args);
}

616 617 618 619
#define ext4_warning_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),	\
			     "EXT4-fs warning")

620
void __ext4_warning(struct super_block *sb, const char *function,
621
		    unsigned int line, const char *fmt, ...)
622
{
J
Joe Perches 已提交
623
	struct va_format vaf;
624 625
	va_list args;

626
	if (!ext4_warning_ratelimit(sb))
627 628
		return;

629
	va_start(args, fmt);
J
Joe Perches 已提交
630 631 632 633
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
634 635 636
	va_end(args);
}

637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654
void __ext4_warning_inode(const struct inode *inode, const char *function,
			  unsigned int line, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	if (!ext4_warning_ratelimit(inode->i_sb))
		return;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (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);
}

655 656 657 658
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, ...)
659 660 661
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
662
	struct va_format vaf;
663 664 665
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

666 667 668
	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
669

670 671 672 673 674 675 676 677 678 679 680 681 682 683
	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);
	}
684 685

	if (test_opt(sb, ERRORS_CONT)) {
686
		ext4_commit_super(sb, 0);
687 688
		return;
	}
689

690 691 692 693 694 695 696 697
	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
698
	 * ext4_grp_locked_error() to distinguish between the
699 700 701 702 703 704 705 706
	 * 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;
}

707
void ext4_update_dynamic_rev(struct super_block *sb)
708
{
709
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
710

711
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
712 713
		return;

714
	ext4_warning(sb,
715 716
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
717
		     EXT4_DYNAMIC_REV);
718

719 720 721
	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);
722 723 724 725 726 727 728 729 730 731 732 733 734
	/* 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
 */
735
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
736 737 738 739
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

740
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
741 742 743 744 745
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
746
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
747 748 749 750 751 752 753
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
754
static void ext4_blkdev_put(struct block_device *bdev)
755
{
A
Al Viro 已提交
756
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
757 758
}

A
Al Viro 已提交
759
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
760 761 762 763
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
764
		ext4_blkdev_put(bdev);
765 766 767 768 769 770
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
771
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
772 773
}

774
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
775 776 777
{
	struct list_head *l;

778 779
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
780 781 782 783 784 785 786 787 788 789 790 791

	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));
	}
}

792
static void ext4_put_super(struct super_block *sb)
793
{
794 795
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
796
	int i, err;
797

798
	ext4_unregister_li_request(sb);
799 800
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

801 802
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
803

804 805 806 807
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
808
			ext4_abort(sb, "Couldn't clean up the journal");
809
	}
810

811
	ext4_unregister_sysfs(sb);
812
	ext4_es_unregister_shrinker(sbi);
813
	del_timer_sync(&sbi->s_err_report);
814 815 816 817 818
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

819
	if (!(sb->s_flags & MS_RDONLY)) {
820
		ext4_clear_feature_journal_needs_recovery(sb);
821 822
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
823
	if (!(sb->s_flags & MS_RDONLY))
824 825
		ext4_commit_super(sb, 1);

826 827
	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
828 829
	kvfree(sbi->s_group_desc);
	kvfree(sbi->s_flex_groups);
830
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
831 832
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
833
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
834 835
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
836
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
837 838 839 840 841 842 843 844 845 846 847
		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));

848
	sync_blockdev(sb->s_bdev);
849
	invalidate_bdev(sb->s_bdev);
850 851 852 853 854 855 856
	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);
857
		invalidate_bdev(sbi->journal_bdev);
858
		ext4_blkdev_remove(sbi);
859
	}
860 861 862 863
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
864 865
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
866
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
867 868 869 870 871 872
	/*
	 * 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);
873 874
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
875
	kfree(sbi->s_blockgroup_lock);
876 877 878
	kfree(sbi);
}

879
static struct kmem_cache *ext4_inode_cachep;
880 881 882 883

/*
 * Called inside transaction, so use GFP_NOFS
 */
884
static struct inode *ext4_alloc_inode(struct super_block *sb)
885
{
886
	struct ext4_inode_info *ei;
887

C
Christoph Lameter 已提交
888
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
889 890
	if (!ei)
		return NULL;
891

892
	ei->vfs_inode.i_version = 1;
893
	spin_lock_init(&ei->i_raw_lock);
894 895
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
896 897
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
898
	INIT_LIST_HEAD(&ei->i_es_list);
899
	ei->i_es_all_nr = 0;
900
	ei->i_es_shk_nr = 0;
901
	ei->i_es_shrink_lblk = 0;
902 903 904
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
905
	ei->i_da_metadata_calc_len = 0;
906
	ei->i_da_metadata_calc_last_lblock = 0;
907
	spin_lock_init(&(ei->i_block_reservation_lock));
908 909
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
J
Jan Kara 已提交
910
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
911
#endif
912
	ei->jinode = NULL;
913
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
914
	spin_lock_init(&ei->i_completed_io_lock);
915 916
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
917
	atomic_set(&ei->i_ioend_count, 0);
918
	atomic_set(&ei->i_unwritten, 0);
919
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
920
#ifdef CONFIG_EXT4_FS_ENCRYPTION
921
	ei->i_crypt_info = NULL;
922
#endif
923 924 925
	return &ei->vfs_inode;
}

926 927 928 929 930 931 932 933
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
934 935 936 937 938 939
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));
}

940
static void ext4_destroy_inode(struct inode *inode)
941
{
942
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
943 944 945
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
946 947 948 949 950
		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
951
	call_rcu(&inode->i_rcu, ext4_i_callback);
952 953
}

954
static void init_once(void *foo)
955
{
956
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
957

C
Christoph Lameter 已提交
958 959
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
960
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
961
	inode_init_once(&ei->vfs_inode);
962 963
}

964
static int __init init_inodecache(void)
965
{
966 967
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
968 969
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
970
					     init_once);
971
	if (ext4_inode_cachep == NULL)
972 973 974 975 976 977
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
978 979 980 981 982
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
983
	kmem_cache_destroy(ext4_inode_cachep);
984 985
}

A
Al Viro 已提交
986
void ext4_clear_inode(struct inode *inode)
987
{
A
Al Viro 已提交
988
	invalidate_inode_buffers(inode);
989
	clear_inode(inode);
990
	dquot_drop(inode);
991
	ext4_discard_preallocations(inode);
992
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
993 994 995 996 997 998
	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;
	}
999 1000
#ifdef CONFIG_EXT4_FS_ENCRYPTION
	if (EXT4_I(inode)->i_crypt_info)
1001
		ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
1002
#endif
1003 1004
}

C
Christoph Hellwig 已提交
1005
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1006
					u64 ino, u32 generation)
1007 1008 1009
{
	struct inode *inode;

1010
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1011
		return ERR_PTR(-ESTALE);
1012
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1013 1014 1015 1016
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
1017
	 * ext4_read_inode will return a bad_inode if the inode had been
1018 1019 1020 1021 1022
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1023
	inode = ext4_iget_normal(sb, ino);
1024 1025 1026
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1027 1028 1029
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1030 1031 1032 1033 1034

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1035
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1036 1037 1038 1039 1040 1041
{
	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,
1042
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1043 1044 1045
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1046 1047
}

1048 1049 1050 1051 1052 1053
/*
 * 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.
 */
1054 1055
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1056 1057 1058 1059 1060 1061 1062 1063
{
	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,
1064
						wait & ~__GFP_DIRECT_RECLAIM);
1065 1066 1067
	return try_to_free_buffers(page);
}

1068
#ifdef CONFIG_QUOTA
1069
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1070
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1071

1072 1073 1074 1075 1076
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);
1077
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1078
			 struct path *path);
1079
static int ext4_quota_off(struct super_block *sb, int type);
1080 1081
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,
1082
			       size_t len, loff_t off);
1083
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1084
				const char *data, size_t len, loff_t off);
1085 1086 1087
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);
1088

J
Jan Kara 已提交
1089 1090 1091 1092 1093
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1094
static const struct dquot_operations ext4_quota_operations = {
1095
	.get_reserved_space = ext4_get_reserved_space,
1096 1097 1098 1099
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1100 1101 1102
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1103 1104
};

1105
static const struct quotactl_ops ext4_qctl_operations = {
1106
	.quota_on	= ext4_quota_on,
1107
	.quota_off	= ext4_quota_off,
1108
	.quota_sync	= dquot_quota_sync,
1109
	.get_state	= dquot_get_state,
1110 1111 1112
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
1113 1114 1115
};
#endif

1116
static const struct super_operations ext4_sops = {
1117 1118 1119 1120
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1121
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1122
	.evict_inode	= ext4_evict_inode,
1123 1124
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1125 1126
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1127 1128 1129
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1130
#ifdef CONFIG_QUOTA
1131 1132
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
J
Jan Kara 已提交
1133
	.get_dquots	= ext4_get_dquots,
1134
#endif
1135
	.bdev_try_to_free_page = bdev_try_to_free_page,
1136 1137
};

1138
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1139 1140
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1141
	.get_parent = ext4_get_parent,
1142 1143 1144 1145 1146
};

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,
1147
	Opt_nouid32, Opt_debug, Opt_removed,
1148
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1149
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1150 1151
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1152
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1153
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1154
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1155
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1156
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
R
Ross Zwisler 已提交
1157
	Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1158
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1159
	Opt_lazytime, Opt_nolazytime,
1160
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1161
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1162
	Opt_dioread_nolock, Opt_dioread_lock,
1163
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1164
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1165 1166
};

1167
static const match_table_t tokens = {
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
	{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"},
1182 1183
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1184 1185 1186 1187
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1188
	{Opt_noload, "norecovery"},
1189
	{Opt_noload, "noload"},
1190 1191
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1192
	{Opt_commit, "commit=%u"},
1193 1194
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1195
	{Opt_journal_dev, "journal_dev=%u"},
1196
	{Opt_journal_path, "journal_path=%s"},
1197
	{Opt_journal_checksum, "journal_checksum"},
1198
	{Opt_nojournal_checksum, "nojournal_checksum"},
1199
	{Opt_journal_async_commit, "journal_async_commit"},
1200 1201 1202 1203
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1204 1205
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1206 1207 1208 1209 1210 1211
	{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
1212
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1213 1214 1215 1216 1217
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1218 1219
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1220
	{Opt_i_version, "i_version"},
R
Ross Zwisler 已提交
1221
	{Opt_dax, "dax"},
1222
	{Opt_stripe, "stripe=%u"},
1223
	{Opt_delalloc, "delalloc"},
1224 1225
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1226
	{Opt_nodelalloc, "nodelalloc"},
1227 1228
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1229 1230
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1231
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1232
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1233
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1234 1235
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1236 1237
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1238 1239
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1240 1241 1242
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1243
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1244
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1245 1246 1247 1248 1249
	{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
1250
	{Opt_err, NULL},
1251 1252
};

1253
static ext4_fsblk_t get_sb_block(void **data)
1254
{
1255
	ext4_fsblk_t	sb_block;
1256 1257 1258 1259
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1260

1261
	options += 3;
1262
	/* TODO: use simple_strtoll with >32bit ext4 */
1263 1264
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1265
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1266 1267 1268 1269 1270 1271
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1272

1273 1274 1275
	return sb_block;
}

1276
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1277 1278
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";
1279

D
Dmitry Monakhov 已提交
1280 1281 1282 1283 1284
#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;
1285
	int ret = -1;
D
Dmitry Monakhov 已提交
1286 1287 1288 1289 1290 1291

	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");
1292
		return -1;
D
Dmitry Monakhov 已提交
1293
	}
1294
	if (ext4_has_feature_quota(sb)) {
1295 1296 1297 1298
		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
			 "when QUOTA feature is enabled");
		return -1;
	}
D
Dmitry Monakhov 已提交
1299 1300 1301 1302
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1303
		return -1;
D
Dmitry Monakhov 已提交
1304
	}
1305 1306 1307 1308 1309 1310 1311 1312
	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
1313
	}
1314
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1315 1316
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1317
		goto errout;
D
Dmitry Monakhov 已提交
1318
	}
1319
	sbi->s_qf_names[qtype] = qname;
1320
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1321
	return 1;
1322 1323 1324
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
}

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");
1336
		return -1;
D
Dmitry Monakhov 已提交
1337
	}
1338
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1339 1340 1341 1342 1343
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1344 1345 1346 1347 1348 1349
#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
1350
#ifdef CONFIG_QUOTA
1351 1352 1353 1354 1355
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1356
#endif
1357
#define MOPT_DATAJ	0x0080
1358 1359 1360
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1361
#define MOPT_STRING	0x0400
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373

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},
1374 1375 1376 1377
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1378 1379
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1380 1381 1382
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1383
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1384 1385
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1386
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1387
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1388
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1389
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
1390
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1391
	{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
	{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},
R
Ross Zwisler 已提交
1409
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1410
	{Opt_stripe, 0, MOPT_GTE0},
1411 1412
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1413 1414 1415
	{Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
	{Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
	{Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1416 1417 1418 1419
	{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},
1420 1421
	{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
1422
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1423 1424
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1425
#else
1426 1427
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1428
#endif
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
	{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},
1445
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1446
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1447 1448 1449 1450 1451 1452 1453 1454 1455
	{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;
1456 1457
	kuid_t uid;
	kgid_t gid;
1458 1459
	int arg = 0;

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
#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
1470
	switch (token) {
1471 1472 1473 1474
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1475 1476 1477
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1478
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
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
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1492 1493
	}

1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
	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;
	}

1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
	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;
	}

1515
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1516 1517 1518
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
1519 1520 1521
	if (m->flags & MOPT_EXPLICIT) {
		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
			set_opt2(sb, EXPLICIT_DELALLOC);
1522 1523
		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1524 1525 1526
		} else
			return -1;
	}
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
	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) {
1546 1547 1548 1549
		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");
1550
			return -1;
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
		}
		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);
1566 1567
			return -1;
		}
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
		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;
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
	} 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;
		}

1609
		journal_inode = d_inode(path.dentry);
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
		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);
1621 1622 1623 1624 1625 1626 1627 1628
	} 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);
1629 1630 1631 1632 1633 1634 1635 1636 1637
	} else if (token == Opt_test_dummy_encryption) {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
		sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
		ext4_msg(sb, KERN_WARNING,
			 "Test dummy encryption mode enabled");
#else
		ext4_msg(sb, KERN_WARNING,
			 "Test dummy encryption mount option ignored");
#endif
1638 1639 1640 1641 1642
	} 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) {
1643
				ext4_msg(sb, KERN_ERR,
1644 1645
					 "Cannot change data mode on remount");
				return -1;
1646
			}
1647
		} else {
1648 1649
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1650
		}
1651 1652 1653 1654 1655 1656 1657 1658
#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;
		}
1659
		if (ext4_has_feature_quota(sb)) {
1660 1661 1662 1663 1664
			ext4_msg(sb, KERN_ERR,
				 "Cannot set journaled quota options "
				 "when QUOTA feature is enabled");
			return -1;
		}
1665
		sbi->s_jquota_fmt = m->mount_opt;
R
Ross Zwisler 已提交
1666 1667
#endif
	} else if (token == Opt_dax) {
1668 1669 1670 1671 1672
#ifdef CONFIG_FS_DAX
		ext4_msg(sb, KERN_WARNING,
		"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
			sbi->s_mount_opt |= m->mount_opt;
#else
R
Ross Zwisler 已提交
1673 1674
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690
#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;
1691
	}
1692
	return 1;
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
}

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.
		 */
1715
		args[0].to = args[0].from = NULL;
1716 1717 1718 1719
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1720 1721
	}
#ifdef CONFIG_QUOTA
1722
	if (ext4_has_feature_quota(sb) &&
1723 1724 1725 1726 1727
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
			 "feature is enabled");
		return 0;
	}
1728
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1729
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1730
			clear_opt(sb, USRQUOTA);
1731

1732
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1733
			clear_opt(sb, GRPQUOTA);
1734

D
Dmitry Monakhov 已提交
1735
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1736 1737
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1738 1739 1740 1741
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1742 1743
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1744 1745 1746 1747
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
	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;
		}
	}
1758 1759 1760 1761 1762 1763
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
	    test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
			 "in data=ordered mode");
		return 0;
	}
1764 1765 1766
	return 1;
}

1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790
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])
1791
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1792 1793

	if (sbi->s_qf_names[GRPQUOTA])
1794
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1795 1796 1797
#endif
}

1798 1799
static const char *token2str(int token)
{
1800
	const struct match_token *t;
1801 1802 1803 1804 1805 1806 1807

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

1808 1809 1810 1811 1812
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1813 1814
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1815 1816 1817
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1818
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1819
	const struct mount_opts *m;
1820
	char sep = nodefs ? '\n' : ',';
1821

1822 1823
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1824 1825

	if (sbi->s_sb_block != 1)
1826 1827 1828 1829 1830 1831 1832
		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;
1833
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1834 1835 1836 1837 1838 1839
			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));
1840
	}
1841

1842
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1843
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1844 1845 1846
		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)) ||
1847
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1848 1849
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1850
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1851 1852
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1853
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1854
		SEQ_OPTS_PUTS("errors=continue");
1855
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1856
		SEQ_OPTS_PUTS("errors=panic");
1857
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1858
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1859
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1860
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1861
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1862
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1863
	if (sb->s_flags & MS_I_VERSION)
1864
		SEQ_OPTS_PUTS("i_version");
1865
	if (nodefs || sbi->s_stripe)
1866
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1867
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1868 1869 1870 1871 1872 1873 1874
		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");
	}
1875 1876
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1877 1878
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1879

1880 1881
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1882
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1883 1884
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1885 1886 1887 1888 1889

	ext4_show_quota_options(seq, sb);
	return 0;
}

1890 1891 1892 1893 1894
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

1895
int ext4_seq_options_show(struct seq_file *seq, void *offset)
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
{
	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;
}

1906
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1907 1908
			    int read_only)
{
1909
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1910 1911
	int res = 0;

1912
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1913 1914
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1915 1916 1917
		res = MS_RDONLY;
	}
	if (read_only)
1918
		goto done;
1919
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1920 1921
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1922
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1923 1924 1925
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1926
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1927 1928
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1929 1930 1931
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1932 1933 1934
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1935 1936 1937
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1938
	if (!sbi->s_journal)
1939
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1940
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1941
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1942
	le16_add_cpu(&es->s_mnt_count, 1);
1943
	es->s_mtime = cpu_to_le32(get_seconds());
1944
	ext4_update_dynamic_rev(sb);
1945
	if (sbi->s_journal)
1946
		ext4_set_feature_journal_needs_recovery(sb);
1947

1948
	ext4_commit_super(sb, 1);
1949
done:
1950
	if (test_opt(sb, DEBUG))
1951
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1952
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1953 1954
			sb->s_blocksize,
			sbi->s_groups_count,
1955 1956
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1957
			sbi->s_mount_opt, sbi->s_mount_opt2);
1958

D
Dan Magenheimer 已提交
1959
	cleancache_init_fs(sb);
1960 1961 1962
	return res;
}

1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
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)));
A
Al Viro 已提交
1988
		kvfree(sbi->s_flex_groups);
1989 1990 1991 1992 1993 1994
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

1995 1996 1997 1998 1999
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;
2000
	int i, err;
2001

2002
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2003
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2004 2005 2006 2007
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

2008 2009
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
2010
		goto failed;
2011 2012

	for (i = 0; i < sbi->s_groups_count; i++) {
2013
		gdp = ext4_get_group_desc(sb, i, NULL);
2014 2015

		flex_group = ext4_flex_group(sbi, i);
2016 2017
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2018 2019
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2020 2021
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2022 2023 2024 2025 2026 2027 2028
	}

	return 1;
failed:
	return 0;
}

2029
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2030
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2031
{
2032
	int offset;
A
Andreas Dilger 已提交
2033
	__u16 crc = 0;
2034
	__le32 le_group = cpu_to_le32(block_group);
2035
	struct ext4_sb_info *sbi = EXT4_SB(sb);
A
Andreas Dilger 已提交
2036

2037
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2038
		/* Use new metadata_csum algorithm */
2039
		__le16 save_csum;
2040 2041
		__u32 csum32;

2042
		save_csum = gdp->bg_checksum;
2043 2044 2045 2046 2047
		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);
2048
		gdp->bg_checksum = save_csum;
2049 2050 2051

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2052 2053
	}

2054
	/* old crc16 code */
2055
	if (!ext4_has_feature_gdt_csum(sb))
2056 2057
		return 0;

2058 2059 2060 2061 2062 2063 2064
	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...*/
2065
	if (ext4_has_feature_64bit(sb) &&
2066 2067 2068 2069 2070 2071
	    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
2072 2073 2074
	return cpu_to_le16(crc);
}

2075
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2076 2077
				struct ext4_group_desc *gdp)
{
2078
	if (ext4_has_group_desc_csum(sb) &&
2079
	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
A
Andreas Dilger 已提交
2080 2081 2082 2083 2084
		return 0;

	return 1;
}

2085 2086 2087 2088 2089
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;
2090
	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2091 2092
}

2093
/* Called at mount-time, super-block is locked */
2094 2095
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2096
{
2097 2098 2099
	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
2100 2101 2102
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2103
	int flexbg_flag = 0;
2104
	ext4_group_t i, grp = sbi->s_groups_count;
2105

2106
	if (ext4_has_feature_flex_bg(sb))
J
Jose R. Santos 已提交
2107 2108
		flexbg_flag = 1;

2109
	ext4_debug("Checking group descriptors");
2110

2111 2112 2113
	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
2114
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2115
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2116 2117
		else
			last_block = first_block +
2118
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2119

2120 2121 2122 2123
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2124
		block_bitmap = ext4_block_bitmap(sb, gdp);
2125
		if (block_bitmap < first_block || block_bitmap > last_block) {
2126
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2127
			       "Block bitmap for group %u not in group "
2128
			       "(block %llu)!", i, block_bitmap);
2129 2130
			return 0;
		}
2131
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2132
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2133
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2134
			       "Inode bitmap for group %u not in group "
2135
			       "(block %llu)!", i, inode_bitmap);
2136 2137
			return 0;
		}
2138
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2139
		if (inode_table < first_block ||
2140
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2141
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2142
			       "Inode table for group %u not in group "
2143
			       "(block %llu)!", i, inode_table);
2144 2145
			return 0;
		}
2146
		ext4_lock_group(sb, i);
2147
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2148 2149
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
2150
				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2151
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2152
			if (!(sb->s_flags & MS_RDONLY)) {
2153
				ext4_unlock_group(sb, i);
2154
				return 0;
2155
			}
A
Andreas Dilger 已提交
2156
		}
2157
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2158 2159
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2160
	}
2161 2162
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2163 2164 2165
	return 1;
}

2166
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178
 * 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
2179
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2180 2181 2182
 * 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.
 */
2183 2184
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
{
	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;
	}

2196
	if (bdev_read_only(sb->s_bdev)) {
2197 2198
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2199 2200 2201
		return;
	}

2202 2203 2204 2205 2206 2207 2208
	/* 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;
	}

2209
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2210 2211
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2212
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2213
				  "clearing orphan list.\n");
2214 2215
			es->s_last_orphan = 0;
		}
2216 2217 2218 2219 2220
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2221
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2222 2223 2224 2225 2226 2227
		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 */
J
Jan Kara 已提交
2228
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2229 2230
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2231
			if (ret < 0)
2232 2233 2234
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2235 2236 2237 2238 2239 2240 2241
		}
	}
#endif

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

2242 2243
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2244 2245 2246 2247
			es->s_last_orphan = 0;
			break;
		}

2248
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2249
		dquot_initialize(inode);
2250
		if (inode->i_nlink) {
2251 2252 2253 2254
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2255
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2256
				  inode->i_ino, inode->i_size);
2257
			mutex_lock(&inode->i_mutex);
2258
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2259
			ext4_truncate(inode);
2260
			mutex_unlock(&inode->i_mutex);
2261 2262
			nr_truncates++;
		} else {
2263 2264 2265 2266
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2267 2268 2269 2270 2271 2272 2273
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2274
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2275 2276

	if (nr_orphans)
2277 2278
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2279
	if (nr_truncates)
2280 2281
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2282 2283
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2284
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2285
		if (sb_dqopt(sb)->files[i])
2286
			dquot_quota_off(sb, i);
2287 2288 2289 2290
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2291

2292 2293 2294 2295 2296 2297 2298
/*
 * 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.
 *
2299 2300 2301 2302 2303 2304
 * 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.
 *
2305 2306
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2307
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2308 2309 2310 2311 2312
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2313
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2314
		/*
2315
		 * CONFIG_LBDAF is not enabled implies the inode
2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
		 * 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;
	}

2326 2327 2328 2329 2330 2331
	/*
	 * 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;
2332 2333 2334 2335 2336 2337 2338 2339
	res <<= blkbits;

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

	return res;
}
2340 2341

/*
2342
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2343 2344
 * 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.
2345
 */
2346
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2347
{
2348
	loff_t res = EXT4_NDIR_BLOCKS;
2349 2350
	int meta_blocks;
	loff_t upper_limit;
2351 2352 2353 2354 2355 2356
	/* 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.
2357 2358
	 */

2359
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2360
		/*
2361
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2362 2363
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2364 2365 2366 2367 2368 2369 2370
		 */
		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
2371 2372 2373 2374 2375 2376
		/*
		 * 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
		 */
2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389
		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;
2390 2391 2392 2393 2394 2395 2396

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2397 2398 2399 2400

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2401 2402 2403
	return res;
}

2404
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2405
				   ext4_fsblk_t logical_sb_block, int nr)
2406
{
2407
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2408
	ext4_group_t bg, first_meta_bg;
2409 2410 2411 2412
	int has_super = 0;

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

2413
	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2414
		return logical_sb_block + nr + 1;
2415
	bg = sbi->s_desc_per_block * nr;
2416
	if (ext4_bg_has_super(sb, bg))
2417
		has_super = 1;
2418

2419 2420 2421 2422 2423 2424 2425 2426 2427 2428
	/*
	 * 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++;

2429
	return (has_super + ext4_group_first_block_no(sb, bg));
2430 2431
}

2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447
/**
 * 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
2448
	int ret;
2449 2450

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2451 2452 2453 2454 2455 2456 2457
		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;
2458

D
Dan Ehrenberg 已提交
2459 2460 2461 2462 2463 2464
	/*
	 * 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;
2465

D
Dan Ehrenberg 已提交
2466
	return ret;
2467
}
2468

2469 2470 2471 2472 2473 2474 2475 2476
/*
 * 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)
{
2477
	if (ext4_has_unknown_ext4_incompat_features(sb)) {
2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488
		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;

2489
	if (ext4_has_feature_readonly(sb)) {
D
Darrick J. Wong 已提交
2490 2491 2492 2493 2494
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2495
	/* Check that feature set is OK for a read-write mount */
2496
	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
		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
	 */
2507
	if (ext4_has_feature_huge_file(sb)) {
2508 2509 2510 2511 2512 2513 2514
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2515
	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2516 2517 2518 2519 2520
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2521 2522

#ifndef CONFIG_QUOTA
2523
	if (ext4_has_feature_quota(sb) && !readonly) {
2524 2525 2526 2527 2528 2529
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
#endif  /* CONFIG_QUOTA */
2530 2531 2532
	return 1;
}

2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546
/*
 * 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)
2547 2548
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2549 2550
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2551
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564
		       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) {
2565
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
		       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 */
}

2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592
/* 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;

2593
	sb_start_write(sb);
2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604
	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;
	}

2605
	if (group >= ngroups)
2606 2607 2608 2609 2610 2611 2612
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2613 2614
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2615 2616 2617 2618 2619
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2620
	sb_end_write(sb);
2621 2622 2623 2624 2625 2626

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2627
 * request structure. Should be called with li_list_mtx held
2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644
 */
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)
{
2645 2646 2647
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2648
		return;
2649
	}
2650 2651

	mutex_lock(&ext4_li_info->li_list_mtx);
2652
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2653
	mutex_unlock(&ext4_li_info->li_list_mtx);
2654
	mutex_unlock(&ext4_li_mtx);
2655 2656
}

2657 2658
static struct task_struct *ext4_lazyinit_task;

2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672
/*
 * 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;
2673
	unsigned long next_wakeup, cur;
2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690

	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);

2691 2692 2693 2694 2695 2696
			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;
				}
2697 2698 2699 2700 2701 2702 2703
			}

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

2704
		try_to_freeze();
2705

2706 2707
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2708
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2709 2710 2711 2712
			cond_resched();
			continue;
		}

2713 2714
		schedule_timeout_interruptible(next_wakeup - cur);

2715 2716 2717 2718
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 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
	}

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)
{
2761 2762 2763 2764
	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);
2765 2766 2767
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2768
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
				 "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.
	 */
2837 2838
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
2839 2840 2841
	return elr;
}

2842 2843
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
2844 2845
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2846
	struct ext4_li_request *elr = NULL;
2847
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2848
	int ret = 0;
2849

2850
	mutex_lock(&ext4_li_mtx);
2851 2852 2853 2854 2855 2856
	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;
2857
		goto out;
2858
	}
2859 2860 2861

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
2862
	    !test_opt(sb, INIT_INODE_TABLE))
2863
		goto out;
2864 2865

	elr = ext4_li_request_new(sb, first_not_zeroed);
2866 2867 2868 2869
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881

	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;
2882 2883 2884 2885 2886 2887
	/*
	 * 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;
2888 2889 2890 2891 2892 2893 2894

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
2895 2896
	mutex_unlock(&ext4_li_mtx);
	if (ret)
2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
		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.
	 */
2911
	if (!ext4_li_info || !ext4_lazyinit_task)
2912 2913
		return;

2914
	kthread_stop(ext4_lazyinit_task);
2915 2916
}

2917 2918 2919 2920 2921 2922
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);

2923
	if (ext4_has_metadata_csum(sb)) {
2924
		/* journal checksum v3 */
2925
		compat = 0;
2926
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
2927 2928 2929 2930 2931 2932
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

2933 2934 2935 2936
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948
	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 {
2949 2950
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2951 2952 2953 2954 2955
	}

	return ret;
}

2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979
/*
 * 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;

2980
	if (!ext4_has_feature_bigalloc(sb))
2981 2982 2983
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

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 3024 3025 3026 3027 3028 3029 3030 3031 3032
	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;
3033
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
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

	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();
	}
3061 3062
	/* Add the internal journal blocks as well */
	if (sbi->s_journal && !sbi->journal_bdev)
3063
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3064

3065 3066 3067 3068 3069 3070
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3071
static void ext4_set_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3072 3073
{
	ext4_fsblk_t resv_clusters;
3074
	struct ext4_sb_info *sbi = EXT4_SB(sb);
L
Lukas Czerner 已提交
3075

3076 3077 3078 3079 3080 3081
	/*
	 * 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.
	 */
3082
	if (!ext4_has_feature_extents(sb))
3083
		return;
L
Lukas Czerner 已提交
3084 3085 3086 3087
	/*
	 * 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
3088
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3089 3090 3091
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3092 3093
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
L
Lukas Czerner 已提交
3094 3095 3096 3097

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

3098
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
L
Lukas Czerner 已提交
3099 3100
}

3101
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3102
{
3103
	char *orig_data = kstrdup(data, GFP_KERNEL);
3104
	struct buffer_head *bh;
3105 3106 3107 3108
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3109
	ext4_fsblk_t logical_sb_block;
3110 3111 3112 3113
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3114
	const char *descr;
3115
	int ret = -ENOMEM;
3116
	int blocksize, clustersize;
3117 3118
	unsigned int db_count;
	unsigned int i;
3119
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3120
	__u64 blocks_count;
3121
	int err = 0;
3122
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3123
	ext4_group_t first_not_zeroed;
3124 3125 3126

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3127
		goto out_free_orig;
3128 3129 3130 3131 3132

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3133
		goto out_free_orig;
3134
	}
3135
	sb->s_fs_info = sbi;
3136
	sbi->s_sb = sb;
3137
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3138
	sbi->s_sb_block = sb_block;
3139 3140 3141
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3142

3143
	/* Cleanup superblock name */
3144
	strreplace(sb->s_id, '/', '!');
3145

3146
	/* -EINVAL is default */
3147
	ret = -EINVAL;
3148
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3149
	if (!blocksize) {
3150
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3151 3152 3153 3154
		goto out_fail;
	}

	/*
3155
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3156 3157
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3158
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3159 3160
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3161
	} else {
3162
		logical_sb_block = sb_block;
3163 3164
	}

3165
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3166
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3167 3168 3169 3170
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3171
	 *       some ext4 macro-instructions depend on its value
3172
	 */
3173
	es = (struct ext4_super_block *) (bh->b_data + offset);
3174 3175
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3176 3177
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3178
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3179

3180
	/* Warn if metadata_csum and gdt_csum are both set. */
3181 3182
	if (ext4_has_feature_metadata_csum(sb) &&
	    ext4_has_feature_gdt_csum(sb))
3183
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3184 3185
			     "redundant flags; please run fsck.");

3186 3187 3188 3189 3190 3191 3192 3193
	/* 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;
	}

3194
	/* Load the checksum driver */
3195
	if (ext4_has_feature_metadata_csum(sb)) {
3196 3197 3198 3199 3200 3201 3202 3203 3204
		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;
		}
	}

3205 3206 3207 3208 3209
	/* 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;
3210
		ret = -EFSBADCRC;
3211 3212 3213 3214
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3215
	if (ext4_has_feature_csum_seed(sb))
3216 3217
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3218 3219 3220
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3221 3222
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3223
	set_opt(sb, INIT_INODE_TABLE);
3224
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3225
		set_opt(sb, DEBUG);
3226
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3227
		set_opt(sb, GRPID);
3228
	if (def_mount_opts & EXT4_DEFM_UID16)
3229
		set_opt(sb, NO_UID32);
3230 3231
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3232
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3233
	set_opt(sb, POSIX_ACL);
3234
#endif
3235 3236 3237 3238
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3239
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3240
		set_opt(sb, JOURNAL_DATA);
3241
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3242
		set_opt(sb, ORDERED_DATA);
3243
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3244
		set_opt(sb, WRITEBACK_DATA);
3245 3246

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3247
		set_opt(sb, ERRORS_PANIC);
3248
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3249
		set_opt(sb, ERRORS_CONT);
3250
	else
3251
		set_opt(sb, ERRORS_RO);
3252 3253
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3254
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3255
		set_opt(sb, DISCARD);
3256

3257 3258
	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));
3259 3260 3261
	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;
3262

3263
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3264
		set_opt(sb, BARRIER);
3265

3266 3267 3268 3269
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3270
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3271
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3272
		set_opt(sb, DELALLOC);
3273

3274 3275 3276 3277 3278 3279
	/*
	 * 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;

3280
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3281
			   &journal_devnum, &journal_ioprio, 0)) {
3282 3283 3284 3285
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3286
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3287
	if (!parse_options((char *) data, sb, &journal_devnum,
3288
			   &journal_ioprio, 0))
3289 3290
		goto failed_mount;

3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301
	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 "
3302
				 "both data=journal and dioread_nolock");
3303 3304
			goto failed_mount;
		}
R
Ross Zwisler 已提交
3305 3306 3307 3308 3309
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3310 3311
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3312 3313
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3314 3315
	}

3316
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3317
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3318

3319
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3320 3321 3322
	    (ext4_has_compat_features(sb) ||
	     ext4_has_ro_compat_features(sb) ||
	     ext4_has_incompat_features(sb)))
3323 3324 3325
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3326

3327 3328
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
3329
		if (ext4_has_feature_64bit(sb)) {
3330 3331 3332 3333 3334 3335
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357
	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;
		}
	}

3358 3359 3360 3361 3362
	/*
	 * 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.
	 */
3363
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3364
		goto failed_mount;
3365

J
Jan Kara 已提交
3366
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3367 3368
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3369 3370
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3371 3372 3373
		goto failed_mount;
	}

R
Ross Zwisler 已提交
3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
		if (blocksize != PAGE_SIZE) {
			ext4_msg(sb, KERN_ERR,
					"error: unsupported blocksize for dax");
			goto failed_mount;
		}
		if (!sb->s_bdev->bd_disk->fops->direct_access) {
			ext4_msg(sb, KERN_ERR,
					"error: device does not support dax");
			goto failed_mount;
		}
	}

3387
	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3388 3389 3390 3391 3392
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3393
	if (sb->s_blocksize != blocksize) {
3394 3395
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3396
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3397
					blocksize);
3398 3399 3400
			goto failed_mount;
		}

3401
		brelse(bh);
3402 3403
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3404
		bh = sb_bread_unmovable(sb, logical_sb_block);
3405
		if (!bh) {
3406 3407
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3408 3409
			goto failed_mount;
		}
3410
		es = (struct ext4_super_block *)(bh->b_data + offset);
3411
		sbi->s_es = es;
3412
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3413 3414
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3415 3416 3417 3418
			goto failed_mount;
		}
	}

3419
	has_huge_files = ext4_has_feature_huge_file(sb);
3420 3421 3422
	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);
3423

3424 3425 3426
	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;
3427 3428 3429
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3430
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3431
		    (!is_power_of_2(sbi->s_inode_size)) ||
3432
		    (sbi->s_inode_size > blocksize)) {
3433 3434
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3435
			       sbi->s_inode_size);
3436 3437
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3438 3439
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3440
	}
3441

3442
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3443
	if (ext4_has_feature_64bit(sb)) {
3444
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3445
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3446
		    !is_power_of_2(sbi->s_desc_size)) {
3447 3448
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3449 3450 3451 3452 3453
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3454

3455 3456
	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);
3457
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3458
		goto cantfind_ext4;
3459

3460
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3461
	if (sbi->s_inodes_per_block == 0)
3462
		goto cantfind_ext4;
3463 3464
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3465
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3466 3467
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3468 3469
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3470

3471
	for (i = 0; i < 4; i++)
3472 3473
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3474
	if (ext4_has_feature_dir_index(sb)) {
3475 3476 3477 3478
		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) {
3479
#ifdef __CHAR_UNSIGNED__
3480 3481 3482 3483
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3484
#else
3485 3486 3487
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3488
#endif
3489
		}
3490
	}
3491

3492 3493
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3494
	has_bigalloc = ext4_has_feature_bigalloc(sb);
3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534
	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;
3535
	}
3536 3537
	sbi->s_cluster_ratio = clustersize / blocksize;

3538
	if (sbi->s_inodes_per_group > blocksize * 8) {
3539 3540
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3541
		       sbi->s_inodes_per_group);
3542 3543 3544
		goto failed_mount;
	}

3545 3546 3547 3548
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3549 3550 3551 3552
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3553
	err = generic_check_addressable(sb->s_blocksize_bits,
3554
					ext4_blocks_count(es));
3555
	if (err) {
3556
		ext4_msg(sb, KERN_ERR, "filesystem"
3557
			 " too large to mount safely on this system");
3558
		if (sizeof(sector_t) < 8)
3559
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3560 3561 3562
		goto failed_mount;
	}

3563 3564
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3565

3566 3567 3568
	/* 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) {
3569 3570
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3571 3572 3573 3574
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3575 3576 3577 3578 3579
	/*
	 * 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)) {
3580
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3581 3582 3583
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3584 3585
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3586 3587 3588 3589
	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));
3590
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3591
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3592
		       "(block count %llu, first data block %u, "
3593
		       "blocks per group %lu)", sbi->s_groups_count,
3594 3595 3596 3597 3598
		       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
3599
	sbi->s_groups_count = blocks_count;
3600 3601
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3602 3603
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3604 3605 3606
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3607
	if (sbi->s_group_desc == NULL) {
3608
		ext4_msg(sb, KERN_ERR, "not enough memory");
3609
		ret = -ENOMEM;
3610 3611 3612
		goto failed_mount;
	}

3613
	bgl_lock_init(sbi->s_blockgroup_lock);
3614 3615

	for (i = 0; i < db_count; i++) {
3616
		block = descriptor_loc(sb, logical_sb_block, i);
3617
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3618
		if (!sbi->s_group_desc[i]) {
3619 3620
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3621 3622 3623 3624
			db_count = i;
			goto failed_mount2;
		}
	}
3625
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3626
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3627
		ret = -EFSCORRUPTED;
3628
		goto failed_mount2;
3629
	}
3630

3631
	sbi->s_gdb_count = db_count;
3632 3633 3634
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3635 3636
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3637

3638
	/* Register extent status tree shrinker */
3639
	if (ext4_es_register_shrinker(sbi))
3640 3641
		goto failed_mount3;

3642
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3643
	sbi->s_extent_max_zeroout_kb = 32;
3644

3645 3646 3647
	/*
	 * set up enough so that it can read an inode
	 */
3648
	sb->s_op = &ext4_sops;
3649 3650
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3651
#ifdef CONFIG_QUOTA
3652
	sb->dq_op = &ext4_quota_operations;
3653
	if (ext4_has_feature_quota(sb))
3654
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3655 3656
	else
		sb->s_qcop = &ext4_qctl_operations;
J
Jan Kara 已提交
3657
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
3658
#endif
3659 3660
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3661
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3662
	mutex_init(&sbi->s_orphan_lock);
3663 3664 3665 3666

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3667
			  ext4_has_feature_journal_needs_recovery(sb));
3668

3669
	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
3670
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3671
			goto failed_mount3a;
3672

3673 3674 3675 3676
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
3677
	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
3678
		if (ext4_load_journal(sb, es, journal_devnum))
3679
			goto failed_mount3a;
3680
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3681
		   ext4_has_feature_journal_needs_recovery(sb)) {
3682 3683
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3684
		goto failed_mount_wq;
3685
	} else {
3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710
		/* Nojournal mode, all journal mount options are illegal */
		if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "journal_checksum, fs mounted w/o journal");
			goto failed_mount_wq;
		}
		if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "journal_async_commit, fs mounted w/o journal");
			goto failed_mount_wq;
		}
		if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "commit=%lu, fs mounted w/o journal",
				 sbi->s_commit_interval / HZ);
			goto failed_mount_wq;
		}
		if (EXT4_MOUNT_DATA_FLAGS &
		    (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "data=, fs mounted w/o journal");
			goto failed_mount_wq;
		}
		sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
		clear_opt(sb, JOURNAL_CHECKSUM);
3711
		clear_opt(sb, DATA_FLAGS);
3712 3713 3714
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3715 3716
	}

3717
	if (ext4_has_feature_64bit(sb) &&
3718 3719
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3720
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3721
		goto failed_mount_wq;
3722 3723
	}

3724 3725 3726 3727
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3728
	}
3729

3730 3731 3732 3733 3734
	/* 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
3735 3736 3737
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3738 3739
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3740
			set_opt(sb, ORDERED_DATA);
3741
		else
3742
			set_opt(sb, JOURNAL_DATA);
3743 3744
		break;

3745 3746
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3747 3748
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3749 3750
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3751
			goto failed_mount_wq;
3752 3753 3754 3755
		}
	default:
		break;
	}
3756
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3757

B
Bobi Jam 已提交
3758 3759
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3760
no_journal:
3761 3762 3763 3764 3765 3766 3767 3768
	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;
		}
	}

3769
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
3770 3771 3772 3773 3774 3775
	    (blocksize != PAGE_CACHE_SIZE)) {
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

3776 3777 3778
	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
	    !ext4_has_feature_encrypt(sb)) {
		ext4_set_feature_encrypt(sb);
3779 3780 3781
		ext4_commit_super(sb, 1);
	}

3782 3783 3784 3785 3786 3787 3788
	/*
	 * 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 {
3789 3790
		err = ext4_calculate_overhead(sb);
		if (err)
3791 3792 3793
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
3794 3795 3796 3797
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3798 3799 3800 3801
	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");
3802
		ret = -ENOMEM;
3803 3804 3805
		goto failed_mount4;
	}

3806
	/*
3807
	 * The jbd2_journal_load will have done any necessary log recovery,
3808 3809 3810
	 * so we can safely mount the rest of the filesystem now.
	 */

3811 3812
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
3813
		ext4_msg(sb, KERN_ERR, "get root inode failed");
3814
		ret = PTR_ERR(root);
3815
		root = NULL;
3816 3817 3818
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3819
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
3820
		iput(root);
3821 3822
		goto failed_mount4;
	}
3823
	sb->s_root = d_make_root(root);
3824
	if (!sb->s_root) {
3825
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
3826 3827 3828
		ret = -ENOMEM;
		goto failed_mount4;
	}
3829

3830 3831
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
3832 3833 3834 3835 3836

	/* 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;
3837
		if (ext4_has_feature_extra_isize(sb)) {
K
Kalpak Shah 已提交
3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852
			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;
3853 3854
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
3855 3856
	}

3857
	ext4_set_resv_clusters(sb);
L
Lukas Czerner 已提交
3858

3859 3860
	err = ext4_setup_system_zone(sb);
	if (err) {
3861
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
3862
			 "zone (%d)", err);
3863 3864 3865 3866 3867 3868 3869 3870
		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);
3871
		goto failed_mount5;
3872 3873
	}

3874 3875 3876
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
3877 3878
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
3879 3880 3881
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
3882 3883
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
3884 3885 3886
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
3887
					  ext4_count_dirs(sb), GFP_KERNEL);
3888
	if (!err)
3889 3890
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
3891 3892 3893 3894 3895
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

3896
	if (ext4_has_feature_flex_bg(sb))
3897 3898 3899 3900 3901 3902 3903
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

3904 3905
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
3906
		goto failed_mount6;
3907

3908
	err = ext4_register_sysfs(sb);
3909 3910
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
3911

3912 3913
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
3914
	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
3915 3916 3917 3918 3919 3920
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

3921 3922 3923
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3924
	if (needs_recovery) {
3925
		ext4_msg(sb, KERN_INFO, "recovery complete");
3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937
		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";

3938 3939 3940 3941 3942 3943 3944 3945
	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");
	}

3946 3947 3948 3949
	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
		ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
			 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
			 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3950

3951 3952
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3953

3954 3955 3956 3957 3958
	/* 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);

3959
	kfree(orig_data);
3960 3961
	return 0;

3962
cantfind_ext4:
3963
	if (!silent)
3964
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3965 3966
	goto failed_mount;

3967 3968
#ifdef CONFIG_QUOTA
failed_mount8:
3969
	ext4_unregister_sysfs(sb);
3970
#endif
3971 3972 3973
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
3974
	ext4_mb_release(sb);
3975
	if (sbi->s_flex_groups)
A
Al Viro 已提交
3976
		kvfree(sbi->s_flex_groups);
3977 3978 3979 3980
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
3981
failed_mount5:
3982 3983 3984
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
3985
	dput(sb->s_root);
3986
	sb->s_root = NULL;
A
Al Viro 已提交
3987
failed_mount4:
3988
	ext4_msg(sb, KERN_ERR, "mount failed");
3989 3990
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
3991
failed_mount_wq:
3992 3993 3994 3995
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
3996
failed_mount3a:
3997
	ext4_es_unregister_shrinker(sbi);
3998
failed_mount3:
3999
	del_timer_sync(&sbi->s_err_report);
4000 4001
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4002 4003 4004
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
4005
	kvfree(sbi->s_group_desc);
4006
failed_mount:
4007 4008
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4009
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4010
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4011 4012
		kfree(sbi->s_qf_names[i]);
#endif
4013
	ext4_blkdev_remove(sbi);
4014 4015 4016
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4017
	kfree(sbi->s_blockgroup_lock);
4018
	kfree(sbi);
4019
out_free_orig:
4020
	kfree(orig_data);
4021
	return err ? err : ret;
4022 4023 4024 4025 4026 4027 4028
}

/*
 * 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.
 */
4029
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4030
{
4031
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4032

4033 4034 4035
	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;
4036

4037
	write_lock(&journal->j_state_lock);
4038
	if (test_opt(sb, BARRIER))
4039
		journal->j_flags |= JBD2_BARRIER;
4040
	else
4041
		journal->j_flags &= ~JBD2_BARRIER;
4042 4043 4044 4045
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4046
	write_unlock(&journal->j_state_lock);
4047 4048
}

4049
static journal_t *ext4_get_journal(struct super_block *sb,
4050 4051 4052 4053 4054
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4055
	BUG_ON(!ext4_has_feature_journal(sb));
4056

4057 4058 4059 4060
	/* 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. */

4061 4062
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4063
		ext4_msg(sb, KERN_ERR, "no journal found");
4064 4065 4066 4067 4068
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4069
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4070 4071 4072
		return NULL;
	}

4073
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4074
		  journal_inode, journal_inode->i_size);
4075
	if (!S_ISREG(journal_inode->i_mode)) {
4076
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4077 4078 4079 4080
		iput(journal_inode);
		return NULL;
	}

4081
	journal = jbd2_journal_init_inode(journal_inode);
4082
	if (!journal) {
4083
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4084 4085 4086 4087
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4088
	ext4_init_journal_params(sb, journal);
4089 4090 4091
	return journal;
}

4092
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4093 4094
				       dev_t j_dev)
{
4095
	struct buffer_head *bh;
4096
	journal_t *journal;
4097 4098
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4099
	int hblock, blocksize;
4100
	ext4_fsblk_t sb_block;
4101
	unsigned long offset;
4102
	struct ext4_super_block *es;
4103 4104
	struct block_device *bdev;

4105
	BUG_ON(!ext4_has_feature_journal(sb));
4106

4107
	bdev = ext4_blkdev_get(j_dev, sb);
4108 4109 4110 4111
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4112
	hblock = bdev_logical_block_size(bdev);
4113
	if (blocksize < hblock) {
4114 4115
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4116 4117 4118
		goto out_bdev;
	}

4119 4120
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4121 4122
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4123 4124
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4125 4126 4127
		goto out_bdev;
	}

4128
	es = (struct ext4_super_block *) (bh->b_data + offset);
4129
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4130
	    !(le32_to_cpu(es->s_feature_incompat) &
4131
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4132 4133
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4134 4135 4136 4137
		brelse(bh);
		goto out_bdev;
	}

4138 4139 4140 4141 4142 4143 4144 4145 4146
	if ((le32_to_cpu(es->s_feature_ro_compat) &
	     EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
	    es->s_checksum != ext4_superblock_csum(sb, es)) {
		ext4_msg(sb, KERN_ERR, "external journal has "
				       "corrupt superblock");
		brelse(bh);
		goto out_bdev;
	}

4147
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4148
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4149 4150 4151 4152
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4153
	len = ext4_blocks_count(es);
4154 4155 4156
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4157
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4158 4159
					start, len, blocksize);
	if (!journal) {
4160
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4161 4162 4163
		goto out_bdev;
	}
	journal->j_private = sb;
4164
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4165 4166
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4167
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4168 4169 4170
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4171 4172
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4173 4174 4175
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4176 4177
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4178
	return journal;
4179

4180
out_journal:
4181
	jbd2_journal_destroy(journal);
4182
out_bdev:
4183
	ext4_blkdev_put(bdev);
4184 4185 4186
	return NULL;
}

4187 4188
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4189 4190 4191 4192 4193 4194 4195 4196
			     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;

4197
	BUG_ON(!ext4_has_feature_journal(sb));
4198

4199 4200
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4201 4202
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213
		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.
	 */
4214
	if (ext4_has_feature_journal_needs_recovery(sb)) {
4215
		if (sb->s_flags & MS_RDONLY) {
4216 4217
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4218
			if (really_read_only) {
4219 4220
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4221 4222
				return -EROFS;
			}
4223 4224
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4225 4226 4227 4228
		}
	}

	if (journal_inum && journal_dev) {
4229 4230
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4231 4232 4233 4234
		return -EINVAL;
	}

	if (journal_inum) {
4235
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4236 4237
			return -EINVAL;
	} else {
4238
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4239 4240 4241
			return -EINVAL;
	}

4242
	if (!(journal->j_flags & JBD2_BARRIER))
4243
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4244

4245
	if (!ext4_has_feature_journal_needs_recovery(sb))
4246
		err = jbd2_journal_wipe(journal, !really_read_only);
4247 4248 4249 4250 4251
	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);
4252
		err = jbd2_journal_load(journal);
4253 4254 4255 4256 4257
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4258 4259

	if (err) {
4260
		ext4_msg(sb, KERN_ERR, "error loading journal");
4261
		jbd2_journal_destroy(journal);
4262 4263 4264
		return err;
	}

4265 4266
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4267

4268
	if (!really_read_only && journal_devnum &&
4269 4270 4271 4272
	    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. */
4273
		ext4_commit_super(sb, 1);
4274 4275 4276 4277 4278
	}

	return 0;
}

4279
static int ext4_commit_super(struct super_block *sb, int sync)
4280
{
4281
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4282
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4283
	int error = 0;
4284

4285
	if (!sbh || block_device_ejected(sb))
4286
		return error;
4287 4288 4289 4290 4291 4292 4293 4294 4295
	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.
		 */
4296 4297
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4298 4299 4300
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312
	/*
	 * 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());
4313 4314 4315
	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
4316 4317
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4318 4319 4320
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4321 4322
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4323 4324
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4325 4326 4327
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4328
				&EXT4_SB(sb)->s_freeinodes_counter));
4329
	BUFFER_TRACE(sbh, "marking dirty");
4330
	ext4_superblock_csum_set(sb);
4331
	mark_buffer_dirty(sbh);
4332
	if (sync) {
4333 4334
		error = __sync_dirty_buffer(sbh,
			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4335 4336 4337 4338 4339
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4340 4341
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4342 4343 4344 4345
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4346
	return error;
4347 4348 4349 4350 4351 4352 4353
}

/*
 * 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.
 */
4354 4355
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4356
{
4357
	journal_t *journal = EXT4_SB(sb)->s_journal;
4358

4359
	if (!ext4_has_feature_journal(sb)) {
4360 4361 4362
		BUG_ON(journal != NULL);
		return;
	}
4363
	jbd2_journal_lock_updates(journal);
4364 4365 4366
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4367
	if (ext4_has_feature_journal_needs_recovery(sb) &&
4368
	    sb->s_flags & MS_RDONLY) {
4369
		ext4_clear_feature_journal_needs_recovery(sb);
4370
		ext4_commit_super(sb, 1);
4371
	}
4372 4373

out:
4374
	jbd2_journal_unlock_updates(journal);
4375 4376 4377 4378 4379 4380 4381
}

/*
 * 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.
 */
4382 4383
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4384 4385 4386 4387 4388
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4389
	BUG_ON(!ext4_has_feature_journal(sb));
4390

4391
	journal = EXT4_SB(sb)->s_journal;
4392 4393 4394

	/*
	 * Now check for any error status which may have been recorded in the
4395
	 * journal by a prior ext4_error() or ext4_abort()
4396 4397
	 */

4398
	j_errno = jbd2_journal_errno(journal);
4399 4400 4401
	if (j_errno) {
		char nbuf[16];

4402
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4403
		ext4_warning(sb, "Filesystem error recorded "
4404
			     "from previous mount: %s", errstr);
4405
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4406

4407 4408
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4409
		ext4_commit_super(sb, 1);
4410

4411
		jbd2_journal_clear_err(journal);
4412
		jbd2_journal_update_sb_errno(journal);
4413 4414 4415 4416 4417 4418 4419
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4420
int ext4_force_commit(struct super_block *sb)
4421 4422 4423 4424 4425 4426
{
	journal_t *journal;

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

4427
	journal = EXT4_SB(sb)->s_journal;
4428
	return ext4_journal_force_commit(journal);
4429 4430
}

4431
static int ext4_sync_fs(struct super_block *sb, int wait)
4432
{
4433
	int ret = 0;
4434
	tid_t target;
4435
	bool needs_barrier = false;
4436
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4437

4438
	trace_ext4_sync_fs(sb, wait);
4439
	flush_workqueue(sbi->rsv_conversion_wq);
4440 4441 4442 4443 4444
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4445 4446 4447 4448 4449
	/*
	 * 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.
	 */
4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461
	if (sbi->s_journal) {
		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;

		if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
			if (wait)
				ret = jbd2_log_wait_commit(sbi->s_journal,
							   target);
		}
	} else if (wait && test_opt(sb, BARRIER))
4462 4463 4464 4465 4466 4467
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4468
	}
4469 4470 4471 4472

	return ret;
}

4473 4474 4475
/*
 * 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.
4476 4477
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4478 4479
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4480
 */
4481
static int ext4_freeze(struct super_block *sb)
4482
{
4483 4484
	int error = 0;
	journal_t *journal;
4485

4486 4487
	if (sb->s_flags & MS_RDONLY)
		return 0;
4488

4489
	journal = EXT4_SB(sb)->s_journal;
4490

4491 4492 4493
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4494

4495 4496 4497 4498 4499 4500 4501
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4502 4503

		/* Journal blocked and flushed, clear needs_recovery flag. */
4504
		ext4_clear_feature_journal_needs_recovery(sb);
4505
	}
4506 4507

	error = ext4_commit_super(sb, 1);
4508
out:
4509 4510 4511
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4512
	return error;
4513 4514 4515 4516 4517 4518
}

/*
 * 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.
 */
4519
static int ext4_unfreeze(struct super_block *sb)
4520
{
4521 4522 4523
	if (sb->s_flags & MS_RDONLY)
		return 0;

4524 4525
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
4526
		ext4_set_feature_journal_needs_recovery(sb);
4527 4528
	}

4529
	ext4_commit_super(sb, 1);
4530
	return 0;
4531 4532
}

4533 4534 4535 4536 4537
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4538
	unsigned long s_mount_opt2;
4539 4540
	kuid_t s_resuid;
	kgid_t s_resgid;
4541 4542 4543 4544
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
J
Jan Kara 已提交
4545
	char *s_qf_names[EXT4_MAXQUOTAS];
4546 4547 4548
#endif
};

4549
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4550
{
4551
	struct ext4_super_block *es;
4552
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4553
	unsigned long old_sb_flags;
4554
	struct ext4_mount_options old_opts;
4555
	int enable_quota = 0;
4556
	ext4_group_t g;
4557
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4558
	int err = 0;
4559
#ifdef CONFIG_QUOTA
4560
	int i, j;
4561
#endif
4562
	char *orig_data = kstrdup(data, GFP_KERNEL);
4563 4564 4565 4566

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4567
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4568 4569 4570
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4571 4572
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4573 4574
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4575
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4576 4577 4578 4579 4580 4581
		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]);
4582
				kfree(orig_data);
4583 4584 4585 4586
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4587
#endif
4588 4589
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4590

4591
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4592 4593 4594 4595
		err = -EINVAL;
		goto restore_opts;
	}

4596
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4597 4598
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4599 4600
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4601 4602
	}

4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615
	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;
		}
R
Ross Zwisler 已提交
4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			err = -EINVAL;
			goto restore_opts;
		}
	}

	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
		ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
			"dax flag with busy inodes while remounting");
		sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
4628 4629
	}

4630
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4631
		ext4_abort(sb, "Abort forced by user");
4632 4633

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4634
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4635 4636 4637

	es = sbi->s_es;

4638
	if (sbi->s_journal) {
4639
		ext4_init_journal_params(sb, sbi->s_journal);
4640 4641
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4642

4643 4644 4645
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4646
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4647
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4648 4649 4650 4651 4652
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4653 4654 4655
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4656 4657
			err = dquot_suspend(sb, -1);
			if (err < 0)
4658 4659
				goto restore_opts;

4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670
			/*
			 * 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.
			 */
4671 4672
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4673 4674
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4675
			if (sbi->s_journal)
4676
				ext4_mark_recovery_complete(sb, es);
4677
		} else {
4678
			/* Make sure we can mount this feature set readwrite */
4679
			if (ext4_has_feature_readonly(sb) ||
D
Darrick J. Wong 已提交
4680
			    !ext4_feature_set_ok(sb, 0)) {
4681 4682 4683
				err = -EROFS;
				goto restore_opts;
			}
4684 4685
			/*
			 * Make sure the group descriptor checksums
4686
			 * are sane.  If they aren't, refuse to remount r/w.
4687 4688 4689 4690 4691
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4692
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4693 4694
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4695
		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
4696
					       le16_to_cpu(gdp->bg_checksum));
4697
					err = -EFSBADCRC;
4698 4699 4700 4701
					goto restore_opts;
				}
			}

4702 4703 4704 4705 4706 4707
			/*
			 * 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) {
4708
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4709 4710
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4711
				       "umount/remount instead");
4712 4713 4714 4715
				err = -EINVAL;
				goto restore_opts;
			}

4716 4717 4718 4719 4720 4721
			/*
			 * 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.)
			 */
4722 4723
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4724
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4725
			if (!ext4_setup_super(sb, es, 0))
4726
				sb->s_flags &= ~MS_RDONLY;
4727
			if (ext4_has_feature_mmp(sb))
4728 4729 4730 4731 4732
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4733
			enable_quota = 1;
4734 4735
		}
	}
4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748

	/*
	 * 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);
	}

4749
	ext4_setup_system_zone(sb);
4750
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4751
		ext4_commit_super(sb, 1);
4752

4753 4754
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
4755
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4756
		kfree(old_opts.s_qf_names[i]);
4757 4758 4759
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
4760
		else if (ext4_has_feature_quota(sb)) {
4761
			err = ext4_enable_quotas(sb);
4762
			if (err)
4763 4764 4765
				goto restore_opts;
		}
	}
4766
#endif
4767

4768
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
4769 4770
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4771
	return 0;
4772

4773 4774 4775
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4776
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4777 4778 4779
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4780 4781
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4782 4783
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
4784
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
4785
		kfree(sbi->s_qf_names[i]);
4786 4787 4788
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4789
	kfree(orig_data);
4790 4791 4792
	return err;
}

4793
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4794 4795
{
	struct super_block *sb = dentry->d_sb;
4796 4797
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
4798
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
4799
	u64 fsid;
4800
	s64 bfree;
L
Lukas Czerner 已提交
4801
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4802

4803 4804
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
4805

4806
	buf->f_type = EXT4_SUPER_MAGIC;
4807
	buf->f_bsize = sb->s_blocksize;
4808
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4809 4810
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4811
	/* prevent underflow in case that few free space is available */
4812
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
4813 4814 4815
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4816 4817
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
4818
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4819
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
4820 4821 4822 4823
	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;
4824

4825 4826 4827
	return 0;
}

4828 4829
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
4830
 * Process 1                         Process 2
4831
 * ext4_create()                     quota_sync()
4832
 *   jbd2_journal_start()                  write_dquot()
4833
 *   dquot_initialize()                         down(dqio_mutex)
4834
 *     down(dqio_mutex)                    jbd2_journal_start()
4835 4836 4837 4838 4839 4840 4841
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
4842
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4843 4844
}

4845
static int ext4_write_dquot(struct dquot *dquot)
4846 4847 4848 4849 4850 4851
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
4852
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4853
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4854 4855 4856
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
4857
	err = ext4_journal_stop(handle);
4858 4859 4860 4861 4862
	if (!ret)
		ret = err;
	return ret;
}

4863
static int ext4_acquire_dquot(struct dquot *dquot)
4864 4865 4866 4867
{
	int ret, err;
	handle_t *handle;

4868
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4869
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4870 4871 4872
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
4873
	err = ext4_journal_stop(handle);
4874 4875 4876 4877 4878
	if (!ret)
		ret = err;
	return ret;
}

4879
static int ext4_release_dquot(struct dquot *dquot)
4880 4881 4882 4883
{
	int ret, err;
	handle_t *handle;

4884
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4885
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
4886 4887 4888
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
4889
		return PTR_ERR(handle);
J
Jan Kara 已提交
4890
	}
4891
	ret = dquot_release(dquot);
4892
	err = ext4_journal_stop(handle);
4893 4894 4895 4896 4897
	if (!ret)
		ret = err;
	return ret;
}

4898
static int ext4_mark_dquot_dirty(struct dquot *dquot)
4899
{
4900 4901 4902
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

4903
	/* Are we journaling quotas? */
4904
	if (ext4_has_feature_quota(sb) ||
4905
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
4906
		dquot_mark_dquot_dirty(dquot);
4907
		return ext4_write_dquot(dquot);
4908 4909 4910 4911 4912
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

4913
static int ext4_write_info(struct super_block *sb, int type)
4914 4915 4916 4917 4918
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
4919
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
4920 4921 4922
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
4923
	err = ext4_journal_stop(handle);
4924 4925 4926 4927 4928 4929 4930 4931 4932
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
4933
static int ext4_quota_on_mount(struct super_block *sb, int type)
4934
{
4935 4936
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
4937 4938 4939 4940 4941
}

/*
 * Standard function to be called on quota_on
 */
4942
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4943
			 struct path *path)
4944 4945 4946 4947 4948
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
4949

4950
	/* Quotafile not on the same filesystem? */
4951
	if (path->dentry->d_sb != sb)
4952
		return -EXDEV;
4953 4954
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
4955
		/* Quotafile not in fs root? */
4956
		if (path->dentry->d_parent != sb->s_root)
4957 4958 4959
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
4960
	}
4961 4962 4963 4964 4965

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
4966
	if (EXT4_SB(sb)->s_journal &&
4967
	    ext4_should_journal_data(d_inode(path->dentry))) {
4968 4969 4970 4971 4972
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4973
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4974
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4975
		if (err)
4976
			return err;
4977 4978
	}

4979
	return dquot_quota_on(sb, type, format_id, path);
4980 4981
}

4982 4983 4984 4985 4986
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
J
Jan Kara 已提交
4987
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
4988 4989 4990 4991
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

4992
	BUG_ON(!ext4_has_feature_quota(sb));
4993 4994 4995 4996 4997 4998 4999 5000 5001 5002

	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
5003 5004
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5005 5006 5007 5008 5009 5010 5011 5012 5013 5014
	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;
J
Jan Kara 已提交
5015
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5016 5017 5018 5019 5020
		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;
J
Jan Kara 已提交
5021
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5022 5023 5024 5025 5026
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5027 5028 5029
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5030 5031 5032 5033 5034 5035 5036
				return err;
			}
		}
	}
	return 0;
}

5037 5038
static int ext4_quota_off(struct super_block *sb, int type)
{
5039 5040 5041
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5042 5043 5044
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5045 5046
		sync_filesystem(sb);

5047 5048 5049
	if (!inode)
		goto out;

5050 5051
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5052
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5053 5054 5055 5056 5057 5058 5059
	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:
5060 5061 5062
	return dquot_quota_off(sb, type);
}

5063 5064
/* 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
5065
 * itself serializes the operations (and no one else should touch the files)
5066
 * we don't have to be afraid of races */
5067
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5068 5069 5070
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5071
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085
	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;
5086 5087 5088
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103
		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) */
5104
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5105 5106 5107
				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
5108
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5109
	int err, offset = off & (sb->s_blocksize - 1);
5110
	int retries = 0;
5111 5112 5113
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5114
	if (EXT4_SB(sb)->s_journal && !handle) {
5115 5116
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5117 5118 5119
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130
	/*
	 * 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;
	}

5131 5132 5133 5134 5135 5136
	do {
		bh = ext4_bread(handle, inode, blk,
				EXT4_GET_BLOCKS_CREATE |
				EXT4_GET_BLOCKS_METADATA_NOFAIL);
	} while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
		 ext4_should_retry_alloc(inode->i_sb, &retries));
5137 5138
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5139 5140
	if (!bh)
		goto out;
5141
	BUFFER_TRACE(bh, "get write access");
5142 5143 5144
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5145
		return err;
5146
	}
5147 5148 5149 5150
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5151
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5152
	brelse(bh);
5153
out:
5154 5155
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5156
		EXT4_I(inode)->i_disksize = inode->i_size;
5157
		ext4_mark_inode_dirty(handle, inode);
5158
	}
5159
	return len;
5160 5161 5162 5163
}

#endif

A
Al Viro 已提交
5164 5165
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5166
{
A
Al Viro 已提交
5167
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5168 5169
}

J
Jan Kara 已提交
5170
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182
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);
}
5183 5184 5185

static inline int ext2_feature_set_ok(struct super_block *sb)
{
5186
	if (ext4_has_unknown_ext2_incompat_features(sb))
5187 5188 5189
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5190
	if (ext4_has_unknown_ext2_ro_compat_features(sb))
5191 5192 5193
		return 0;
	return 1;
}
5194 5195 5196
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5197
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211
#endif

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);
}
5212 5213 5214

static inline int ext3_feature_set_ok(struct super_block *sb)
{
5215
	if (ext4_has_unknown_ext3_incompat_features(sb))
5216
		return 0;
5217
	if (!ext4_has_feature_journal(sb))
5218 5219 5220
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5221
	if (ext4_has_unknown_ext3_ro_compat_features(sb))
5222 5223 5224
		return 0;
	return 1;
}
5225

T
Theodore Ts'o 已提交
5226 5227 5228
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5229
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5230 5231 5232
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5233
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5234

5235 5236 5237 5238
/* 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];

5239
static int __init ext4_init_fs(void)
5240
{
5241
	int i, err;
5242

5243
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5244 5245 5246
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5247
	/* Build-time check for flags consistency */
5248
	ext4_check_flag_values();
5249 5250 5251 5252 5253 5254

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

5255
	err = ext4_init_es();
5256 5257
	if (err)
		return err;
5258 5259 5260

	err = ext4_init_pageio();
	if (err)
5261
		goto out5;
5262

5263
	err = ext4_init_system_zone();
5264
	if (err)
5265
		goto out4;
5266

5267
	err = ext4_init_sysfs();
T
Theodore Ts'o 已提交
5268
	if (err)
5269
		goto out3;
5270

5271
	err = ext4_init_mballoc();
5272 5273
	if (err)
		goto out2;
5274 5275
	else
		ext4_mballoc_ready = 1;
5276 5277 5278
	err = init_inodecache();
	if (err)
		goto out1;
5279
	register_as_ext3();
5280
	register_as_ext2();
T
Theodore Ts'o 已提交
5281
	err = register_filesystem(&ext4_fs_type);
5282 5283
	if (err)
		goto out;
5284

5285 5286
	return 0;
out:
5287 5288
	unregister_as_ext2();
	unregister_as_ext3();
5289 5290
	destroy_inodecache();
out1:
5291
	ext4_mballoc_ready = 0;
5292
	ext4_exit_mballoc();
5293
out2:
5294 5295
	ext4_exit_sysfs();
out3:
5296
	ext4_exit_system_zone();
5297
out4:
5298
	ext4_exit_pageio();
5299
out5:
5300 5301
	ext4_exit_es();

5302 5303 5304
	return err;
}

5305
static void __exit ext4_exit_fs(void)
5306
{
5307
	ext4_exit_crypto();
5308
	ext4_destroy_lazyinit_thread();
5309 5310
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5311
	unregister_filesystem(&ext4_fs_type);
5312
	destroy_inodecache();
5313
	ext4_exit_mballoc();
5314
	ext4_exit_sysfs();
5315 5316
	ext4_exit_system_zone();
	ext4_exit_pageio();
5317
	ext4_exit_es();
5318 5319 5320
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5321
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5322
MODULE_LICENSE("GPL");
5323 5324
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)