super.c 154.2 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 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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/*
 * Lock ordering
 *
 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
 * i_mmap_rwsem (inode->i_mmap_rwsem)!
 *
 * page fault path:
 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
 *   page lock -> i_data_sem (rw)
 *
 * buffered write path:
 * sb_start_write -> i_mutex -> mmap_sem
 * sb_start_write -> i_mutex -> transaction start -> page lock ->
 *   i_data_sem (rw)
 *
 * truncate:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   i_mmap_rwsem (w) -> page lock
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   transaction start -> i_data_sem (rw)
 *
 * direct IO:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
 *   transaction start -> i_data_sem (rw)
 *
 * writepages:
 * transaction start -> page lock(s) -> i_data_sem (rw)
 */

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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);
	}
515
	save_error_info(inode->i_sb, function, line);
516 517 518
	ext4_handle_error(inode->i_sb);
}

519 520
const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
521 522 523 524
{
	char *errstr = NULL;

	switch (errno) {
525 526 527 528 529 530
	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
531 532 533 534 535 536 537
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
538 539
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
			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;
}

559
/* __ext4_std_error decodes expected errors from journaling functions
560 561
 * automatically and invokes the appropriate error response.  */

562 563
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
564 565 566 567 568 569 570 571 572 573 574
{
	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;

575 576 577 578 579
	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);
	}
580

581
	save_error_info(sb, function, line);
582
	ext4_handle_error(sb);
583 584 585
}

/*
586
 * ext4_abort is a much stronger failure handler than ext4_error.  The
587 588 589 590 591 592 593 594
 * 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.
 */

595
void __ext4_abort(struct super_block *sb, const char *function,
596
		unsigned int line, const char *fmt, ...)
597 598 599
{
	va_list args;

600
	save_error_info(sb, function, line);
601
	va_start(args, fmt);
602 603
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
604 605 606 607
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

608 609 610
	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;
611 612 613 614 615 616
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
617 618 619 620
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
621 622 623 624
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
625
		panic("EXT4-fs panic from previous error\n");
626
	}
627 628
}

629 630
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
631
{
J
Joe Perches 已提交
632
	struct va_format vaf;
633 634
	va_list args;

635 636 637
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

638
	va_start(args, fmt);
J
Joe Perches 已提交
639 640 641
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
642 643 644
	va_end(args);
}

645 646 647 648
#define ext4_warning_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),	\
			     "EXT4-fs warning")

649
void __ext4_warning(struct super_block *sb, const char *function,
650
		    unsigned int line, const char *fmt, ...)
651
{
J
Joe Perches 已提交
652
	struct va_format vaf;
653 654
	va_list args;

655
	if (!ext4_warning_ratelimit(sb))
656 657
		return;

658
	va_start(args, fmt);
J
Joe Perches 已提交
659 660 661 662
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
663 664 665
	va_end(args);
}

666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
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);
}

684 685 686 687
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, ...)
688 689 690
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
691
	struct va_format vaf;
692 693 694
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

695 696 697
	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
698

699 700 701 702 703 704 705 706 707 708 709 710 711 712
	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);
	}
713 714

	if (test_opt(sb, ERRORS_CONT)) {
715
		ext4_commit_super(sb, 0);
716 717
		return;
	}
718

719 720 721 722 723 724 725 726
	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
727
	 * ext4_grp_locked_error() to distinguish between the
728 729 730 731 732 733 734 735
	 * 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;
}

736
void ext4_update_dynamic_rev(struct super_block *sb)
737
{
738
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
739

740
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
741 742
		return;

743
	ext4_warning(sb,
744 745
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
746
		     EXT4_DYNAMIC_REV);
747

748 749 750
	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);
751 752 753 754 755 756 757 758 759 760 761 762 763
	/* 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
 */
764
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
765 766 767 768
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

769
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
770 771 772 773 774
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
775
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
776 777 778 779 780 781 782
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
783
static void ext4_blkdev_put(struct block_device *bdev)
784
{
A
Al Viro 已提交
785
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
786 787
}

A
Al Viro 已提交
788
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
789 790 791 792
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
793
		ext4_blkdev_put(bdev);
794 795 796 797 798 799
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
800
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
801 802
}

803
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
804 805 806
{
	struct list_head *l;

807 808
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
809 810 811 812 813 814 815 816 817 818 819 820

	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));
	}
}

821
static void ext4_put_super(struct super_block *sb)
822
{
823 824
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
825
	int i, err;
826

827
	ext4_unregister_li_request(sb);
828 829
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

830 831
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
832

833 834 835 836
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
837
			ext4_abort(sb, "Couldn't clean up the journal");
838
	}
839

840
	ext4_unregister_sysfs(sb);
841
	ext4_es_unregister_shrinker(sbi);
842
	del_timer_sync(&sbi->s_err_report);
843 844 845 846
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);

847
	if (!(sb->s_flags & MS_RDONLY)) {
848
		ext4_clear_feature_journal_needs_recovery(sb);
849 850
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
851
	if (!(sb->s_flags & MS_RDONLY))
852 853
		ext4_commit_super(sb, 1);

854 855
	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
856 857
	kvfree(sbi->s_group_desc);
	kvfree(sbi->s_flex_groups);
858
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
859 860
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
861
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
862
	percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
863 864
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
865
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
866 867 868 869 870 871 872 873 874 875 876
		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));

877
	sync_blockdev(sb->s_bdev);
878
	invalidate_bdev(sb->s_bdev);
879 880 881 882 883 884 885
	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);
886
		invalidate_bdev(sbi->journal_bdev);
887
		ext4_blkdev_remove(sbi);
888
	}
889 890 891 892
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
893 894
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
895
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
896 897 898 899 900 901
	/*
	 * 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);
902 903
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
904
	kfree(sbi->s_blockgroup_lock);
905 906 907
	kfree(sbi);
}

908
static struct kmem_cache *ext4_inode_cachep;
909 910 911 912

/*
 * Called inside transaction, so use GFP_NOFS
 */
913
static struct inode *ext4_alloc_inode(struct super_block *sb)
914
{
915
	struct ext4_inode_info *ei;
916

C
Christoph Lameter 已提交
917
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
918 919
	if (!ei)
		return NULL;
920

921
	ei->vfs_inode.i_version = 1;
922
	spin_lock_init(&ei->i_raw_lock);
923 924
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
925 926
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
927
	INIT_LIST_HEAD(&ei->i_es_list);
928
	ei->i_es_all_nr = 0;
929
	ei->i_es_shk_nr = 0;
930
	ei->i_es_shrink_lblk = 0;
931 932 933
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
934
	ei->i_da_metadata_calc_len = 0;
935
	ei->i_da_metadata_calc_last_lblock = 0;
936
	spin_lock_init(&(ei->i_block_reservation_lock));
937 938
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
J
Jan Kara 已提交
939
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
940
#endif
941
	ei->jinode = NULL;
942
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
943
	spin_lock_init(&ei->i_completed_io_lock);
944 945
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
946
	atomic_set(&ei->i_unwritten, 0);
947
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
948
#ifdef CONFIG_EXT4_FS_ENCRYPTION
949
	ei->i_crypt_info = NULL;
950
#endif
951 952 953
	return &ei->vfs_inode;
}

954 955 956 957 958 959 960 961
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
962 963 964 965 966 967
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));
}

968
static void ext4_destroy_inode(struct inode *inode)
969
{
970
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
971 972 973
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
974 975 976 977 978
		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
979
	call_rcu(&inode->i_rcu, ext4_i_callback);
980 981
}

982
static void init_once(void *foo)
983
{
984
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
985

C
Christoph Lameter 已提交
986 987
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
988
	init_rwsem(&ei->i_data_sem);
989
	init_rwsem(&ei->i_mmap_sem);
C
Christoph Lameter 已提交
990
	inode_init_once(&ei->vfs_inode);
991 992
}

993
static int __init init_inodecache(void)
994
{
995 996
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
997
					     0, (SLAB_RECLAIM_ACCOUNT|
998
						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
999
					     init_once);
1000
	if (ext4_inode_cachep == NULL)
1001 1002 1003 1004 1005 1006
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
1007 1008 1009 1010 1011
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
1012
	kmem_cache_destroy(ext4_inode_cachep);
1013 1014
}

A
Al Viro 已提交
1015
void ext4_clear_inode(struct inode *inode)
1016
{
A
Al Viro 已提交
1017
	invalidate_inode_buffers(inode);
1018
	clear_inode(inode);
1019
	dquot_drop(inode);
1020
	ext4_discard_preallocations(inode);
1021
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1022 1023 1024 1025 1026 1027
	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;
	}
1028 1029
#ifdef CONFIG_EXT4_FS_ENCRYPTION
	if (EXT4_I(inode)->i_crypt_info)
1030
		ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
1031
#endif
1032 1033
}

C
Christoph Hellwig 已提交
1034
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1035
					u64 ino, u32 generation)
1036 1037 1038
{
	struct inode *inode;

1039
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1040
		return ERR_PTR(-ESTALE);
1041
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1042 1043 1044 1045
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
1046
	 * ext4_read_inode will return a bad_inode if the inode had been
1047 1048 1049 1050 1051
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1052
	inode = ext4_iget_normal(sb, ino);
1053 1054 1055
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1056 1057 1058
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1059 1060 1061 1062 1063

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1064
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1065 1066 1067 1068 1069 1070
{
	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,
1071
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1072 1073 1074
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1075 1076
}

1077 1078 1079 1080 1081 1082
/*
 * 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.
 */
1083 1084
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1085 1086 1087 1088 1089 1090 1091 1092
{
	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,
1093
						wait & ~__GFP_DIRECT_RECLAIM);
1094 1095 1096
	return try_to_free_buffers(page);
}

1097
#ifdef CONFIG_QUOTA
L
Li Xi 已提交
1098 1099
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
1100

1101 1102 1103 1104 1105
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);
1106
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1107
			 struct path *path);
1108
static int ext4_quota_off(struct super_block *sb, int type);
1109 1110
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,
1111
			       size_t len, loff_t off);
1112
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1113
				const char *data, size_t len, loff_t off);
1114 1115 1116
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);
1117
static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1118

J
Jan Kara 已提交
1119 1120 1121 1122 1123
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1124
static const struct dquot_operations ext4_quota_operations = {
1125
	.get_reserved_space = ext4_get_reserved_space,
1126 1127 1128 1129
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1130 1131 1132
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
L
Li Xi 已提交
1133
	.get_projid	= ext4_get_projid,
1134
	.get_next_id	= ext4_get_next_id,
1135 1136
};

1137
static const struct quotactl_ops ext4_qctl_operations = {
1138
	.quota_on	= ext4_quota_on,
1139
	.quota_off	= ext4_quota_off,
1140
	.quota_sync	= dquot_quota_sync,
1141
	.get_state	= dquot_get_state,
1142 1143
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
1144 1145
	.set_dqblk	= dquot_set_dqblk,
	.get_nextdqblk	= dquot_get_next_dqblk,
1146 1147 1148
};
#endif

1149
static const struct super_operations ext4_sops = {
1150 1151 1152 1153
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1154
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1155
	.evict_inode	= ext4_evict_inode,
1156 1157
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1158 1159
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1160 1161 1162
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1163
#ifdef CONFIG_QUOTA
1164 1165
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
J
Jan Kara 已提交
1166
	.get_dquots	= ext4_get_dquots,
1167
#endif
1168
	.bdev_try_to_free_page = bdev_try_to_free_page,
1169 1170
};

1171
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1172 1173
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1174
	.get_parent = ext4_get_parent,
1175 1176 1177 1178 1179
};

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,
1180
	Opt_nouid32, Opt_debug, Opt_removed,
1181
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1182
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1183 1184
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1185
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1186
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1187
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1188
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1189
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
R
Ross Zwisler 已提交
1190
	Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1191
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1192
	Opt_lazytime, Opt_nolazytime,
1193
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1194
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1195
	Opt_dioread_nolock, Opt_dioread_lock,
1196
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1197
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1198 1199
};

1200
static const match_table_t tokens = {
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	{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"},
1215 1216
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1217 1218 1219 1220
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1221
	{Opt_noload, "norecovery"},
1222
	{Opt_noload, "noload"},
1223 1224
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1225
	{Opt_commit, "commit=%u"},
1226 1227
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1228
	{Opt_journal_dev, "journal_dev=%u"},
1229
	{Opt_journal_path, "journal_path=%s"},
1230
	{Opt_journal_checksum, "journal_checksum"},
1231
	{Opt_nojournal_checksum, "nojournal_checksum"},
1232
	{Opt_journal_async_commit, "journal_async_commit"},
1233 1234 1235 1236
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1237 1238
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1239 1240 1241 1242 1243 1244
	{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
1245
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1246 1247 1248 1249 1250
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1251 1252
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1253
	{Opt_i_version, "i_version"},
R
Ross Zwisler 已提交
1254
	{Opt_dax, "dax"},
1255
	{Opt_stripe, "stripe=%u"},
1256
	{Opt_delalloc, "delalloc"},
1257 1258
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1259
	{Opt_nodelalloc, "nodelalloc"},
1260 1261
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1262 1263
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1264
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1265
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1266
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1267 1268
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1269 1270
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1271 1272
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1273 1274 1275
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1276
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1277
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1278 1279 1280 1281 1282
	{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
1283
	{Opt_err, NULL},
1284 1285
};

1286
static ext4_fsblk_t get_sb_block(void **data)
1287
{
1288
	ext4_fsblk_t	sb_block;
1289 1290 1291 1292
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1293

1294
	options += 3;
1295
	/* TODO: use simple_strtoll with >32bit ext4 */
1296 1297
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1298
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1299 1300 1301 1302 1303 1304
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1305

1306 1307 1308
	return sb_block;
}

1309
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1310 1311
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";
1312

D
Dmitry Monakhov 已提交
1313 1314 1315 1316 1317
#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;
1318
	int ret = -1;
D
Dmitry Monakhov 已提交
1319 1320 1321 1322 1323 1324

	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");
1325
		return -1;
D
Dmitry Monakhov 已提交
1326
	}
1327
	if (ext4_has_feature_quota(sb)) {
1328 1329 1330
		ext4_msg(sb, KERN_INFO, "Journaled quota options "
			 "ignored when QUOTA feature is enabled");
		return 1;
1331
	}
D
Dmitry Monakhov 已提交
1332 1333 1334 1335
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1336
		return -1;
D
Dmitry Monakhov 已提交
1337
	}
1338 1339 1340 1341 1342 1343 1344 1345
	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
1346
	}
1347
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1348 1349
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1350
		goto errout;
D
Dmitry Monakhov 已提交
1351
	}
1352
	sbi->s_qf_names[qtype] = qname;
1353
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1354
	return 1;
1355 1356 1357
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
}

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");
1369
		return -1;
D
Dmitry Monakhov 已提交
1370
	}
1371
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1372 1373 1374 1375 1376
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1377 1378 1379 1380 1381 1382
#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
1383
#ifdef CONFIG_QUOTA
1384 1385 1386 1387 1388
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1389
#endif
1390
#define MOPT_DATAJ	0x0080
1391 1392 1393
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1394
#define MOPT_STRING	0x0400
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406

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},
1407 1408 1409 1410
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1411 1412
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1413 1414 1415
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1416
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1417 1418
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1419
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1420
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1421
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1422
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
1423
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1424
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1425 1426 1427
	{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},
1428
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1429
	 MOPT_NO_EXT2},
1430
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1431
	 MOPT_NO_EXT2},
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
	{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
1442
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1443
	{Opt_stripe, 0, MOPT_GTE0},
1444 1445
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1446 1447 1448
	{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},
1449 1450 1451 1452
	{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},
1453 1454
	{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
1455
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1456 1457
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1458
#else
1459 1460
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1461
#endif
1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
	{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},
1478
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1479
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1480 1481 1482 1483 1484 1485 1486 1487 1488
	{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;
1489 1490
	kuid_t uid;
	kgid_t gid;
1491 1492
	int arg = 0;

1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
#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
1503
	switch (token) {
1504 1505 1506 1507
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1508 1509 1510
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1511
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1512 1513 1514 1515 1516 1517 1518
		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;
1519 1520 1521 1522 1523 1524
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1525 1526
	}

1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
	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;
	}

1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
	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;
	}

1548
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1549 1550 1551
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
1552 1553 1554
	if (m->flags & MOPT_EXPLICIT) {
		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
			set_opt2(sb, EXPLICIT_DELALLOC);
1555 1556
		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1557 1558 1559
		} else
			return -1;
	}
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
	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) {
1579 1580 1581 1582
		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");
1583
			return -1;
1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598
		}
		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);
1599 1600
			return -1;
		}
1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
		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;
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641
	} 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;
		}

1642
		journal_inode = d_inode(path.dentry);
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
		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);
1654 1655 1656 1657 1658 1659 1660 1661
	} 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);
1662 1663 1664 1665 1666 1667 1668 1669 1670
	} 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
1671 1672 1673 1674 1675
	} 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) {
1676
				ext4_msg(sb, KERN_ERR,
1677 1678
					 "Cannot change data mode on remount");
				return -1;
1679
			}
1680
		} else {
1681 1682
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1683
		}
1684 1685 1686 1687 1688 1689 1690 1691
#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;
		}
1692
		if (ext4_has_feature_quota(sb)) {
1693 1694
			ext4_msg(sb, KERN_INFO,
				 "Quota format mount options ignored "
1695
				 "when QUOTA feature is enabled");
1696
			return 1;
1697
		}
1698
		sbi->s_jquota_fmt = m->mount_opt;
R
Ross Zwisler 已提交
1699 1700
#endif
	} else if (token == Opt_dax) {
1701 1702 1703 1704 1705
#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
1706 1707
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1708
#endif
1709 1710 1711 1712
	} else if (token == Opt_data_err_abort) {
		sbi->s_mount_opt |= m->mount_opt;
	} else if (token == Opt_data_err_ignore) {
		sbi->s_mount_opt &= ~m->mount_opt;
1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
	} 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;
1728
	}
1729
	return 1;
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
}

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.
		 */
1752
		args[0].to = args[0].from = NULL;
1753 1754 1755 1756
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1757 1758
	}
#ifdef CONFIG_QUOTA
1759
	if (ext4_has_feature_quota(sb) &&
1760
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1761 1762 1763 1764 1765
		ext4_msg(sb, KERN_INFO, "Quota feature enabled, usrquota and grpquota "
			 "mount options ignored.");
		clear_opt(sb, USRQUOTA);
		clear_opt(sb, GRPQUOTA);
	} else if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1766
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1767
			clear_opt(sb, USRQUOTA);
1768

1769
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1770
			clear_opt(sb, GRPQUOTA);
1771

D
Dmitry Monakhov 已提交
1772
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1773 1774
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1775 1776 1777 1778
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1779 1780
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1781 1782 1783 1784
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1785 1786 1787 1788
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

1789
		if (blocksize < PAGE_SIZE) {
J
Jan Kara 已提交
1790 1791 1792 1793 1794
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1795 1796 1797 1798 1799 1800
	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;
	}
1801 1802 1803
	return 1;
}

1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827
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])
1828
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1829 1830

	if (sbi->s_qf_names[GRPQUOTA])
1831
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1832 1833 1834
#endif
}

1835 1836
static const char *token2str(int token)
{
1837
	const struct match_token *t;
1838 1839 1840 1841 1842 1843 1844

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

1845 1846 1847 1848 1849
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1850 1851
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1852 1853 1854
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1855
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1856
	const struct mount_opts *m;
1857
	char sep = nodefs ? '\n' : ',';
1858

1859 1860
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1861 1862

	if (sbi->s_sb_block != 1)
1863 1864 1865 1866 1867 1868 1869
		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;
1870
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1871 1872 1873 1874 1875 1876
			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));
1877
	}
1878

1879
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1880
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1881 1882 1883
		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)) ||
1884
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1885 1886
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1887
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1888 1889
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1890
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1891
		SEQ_OPTS_PUTS("errors=continue");
1892
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1893
		SEQ_OPTS_PUTS("errors=panic");
1894
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1895
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1896
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1897
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1898
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1899
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1900
	if (sb->s_flags & MS_I_VERSION)
1901
		SEQ_OPTS_PUTS("i_version");
1902
	if (nodefs || sbi->s_stripe)
1903
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1904
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1905 1906 1907 1908 1909 1910 1911
		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");
	}
1912 1913
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1914 1915
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1916

1917 1918
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1919
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1920 1921
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1922 1923
	if (test_opt(sb, DATA_ERR_ABORT))
		SEQ_OPTS_PUTS("data_err=abort");
1924 1925 1926 1927 1928

	ext4_show_quota_options(seq, sb);
	return 0;
}

1929 1930 1931 1932 1933
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

1934
int ext4_seq_options_show(struct seq_file *seq, void *offset)
1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
{
	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;
}

1945
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1946 1947
			    int read_only)
{
1948
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1949 1950
	int res = 0;

1951
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1952 1953
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1954 1955 1956
		res = MS_RDONLY;
	}
	if (read_only)
1957
		goto done;
1958
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1959 1960
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1961
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1962 1963 1964
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1965
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1966 1967
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1968 1969 1970
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1971 1972 1973
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1974 1975 1976
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1977
	if (!sbi->s_journal)
1978
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1979
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1980
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1981
	le16_add_cpu(&es->s_mnt_count, 1);
1982
	es->s_mtime = cpu_to_le32(get_seconds());
1983
	ext4_update_dynamic_rev(sb);
1984
	if (sbi->s_journal)
1985
		ext4_set_feature_journal_needs_recovery(sb);
1986

1987
	ext4_commit_super(sb, 1);
1988
done:
1989
	if (test_opt(sb, DEBUG))
1990
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1991
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1992 1993
			sb->s_blocksize,
			sbi->s_groups_count,
1994 1995
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1996
			sbi->s_mount_opt, sbi->s_mount_opt2);
1997

D
Dan Magenheimer 已提交
1998
	cleancache_init_fs(sb);
1999 2000 2001
	return res;
}

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
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
2027
		kvfree(sbi->s_flex_groups);
2028 2029 2030 2031 2032 2033
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

2034 2035 2036 2037 2038
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;
2039
	int i, err;
2040

2041
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2042
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2043 2044 2045 2046
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

2047 2048
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
2049
		goto failed;
2050 2051

	for (i = 0; i < sbi->s_groups_count; i++) {
2052
		gdp = ext4_get_group_desc(sb, i, NULL);
2053 2054

		flex_group = ext4_flex_group(sbi, i);
2055 2056
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2057 2058
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2059 2060
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2061 2062 2063 2064 2065 2066 2067
	}

	return 1;
failed:
	return 0;
}

2068
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2069
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2070
{
2071
	int offset = offsetof(struct ext4_group_desc, bg_checksum);
A
Andreas Dilger 已提交
2072
	__u16 crc = 0;
2073
	__le32 le_group = cpu_to_le32(block_group);
2074
	struct ext4_sb_info *sbi = EXT4_SB(sb);
A
Andreas Dilger 已提交
2075

2076
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2077 2078
		/* Use new metadata_csum algorithm */
		__u32 csum32;
2079
		__u16 dummy_csum = 0;
2080 2081 2082

		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
2083 2084 2085 2086 2087 2088 2089
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
				     sizeof(dummy_csum));
		offset += sizeof(dummy_csum);
		if (offset < sbi->s_desc_size)
			csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
					     sbi->s_desc_size - offset);
2090 2091 2092

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2093 2094
	}

2095
	/* old crc16 code */
2096
	if (!ext4_has_feature_gdt_csum(sb))
2097 2098
		return 0;

2099 2100 2101 2102 2103
	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...*/
2104
	if (ext4_has_feature_64bit(sb) &&
2105 2106 2107 2108 2109 2110
	    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
2111 2112 2113
	return cpu_to_le16(crc);
}

2114
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2115 2116
				struct ext4_group_desc *gdp)
{
2117
	if (ext4_has_group_desc_csum(sb) &&
2118
	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
A
Andreas Dilger 已提交
2119 2120 2121 2122 2123
		return 0;

	return 1;
}

2124 2125 2126 2127 2128
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;
2129
	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2130 2131
}

2132
/* Called at mount-time, super-block is locked */
2133 2134
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2135
{
2136 2137 2138
	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
2139 2140 2141
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2142
	int flexbg_flag = 0;
2143
	ext4_group_t i, grp = sbi->s_groups_count;
2144

2145
	if (ext4_has_feature_flex_bg(sb))
J
Jose R. Santos 已提交
2146 2147
		flexbg_flag = 1;

2148
	ext4_debug("Checking group descriptors");
2149

2150 2151 2152
	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
2153
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2154
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2155 2156
		else
			last_block = first_block +
2157
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2158

2159 2160 2161 2162
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2163
		block_bitmap = ext4_block_bitmap(sb, gdp);
2164
		if (block_bitmap < first_block || block_bitmap > last_block) {
2165
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2166
			       "Block bitmap for group %u not in group "
2167
			       "(block %llu)!", i, block_bitmap);
2168 2169
			return 0;
		}
2170
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2171
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2172
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2173
			       "Inode bitmap for group %u not in group "
2174
			       "(block %llu)!", i, inode_bitmap);
2175 2176
			return 0;
		}
2177
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2178
		if (inode_table < first_block ||
2179
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2180
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2181
			       "Inode table for group %u not in group "
2182
			       "(block %llu)!", i, inode_table);
2183 2184
			return 0;
		}
2185
		ext4_lock_group(sb, i);
2186
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2187 2188
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
2189
				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2190
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2191
			if (!(sb->s_flags & MS_RDONLY)) {
2192
				ext4_unlock_group(sb, i);
2193
				return 0;
2194
			}
A
Andreas Dilger 已提交
2195
		}
2196
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2197 2198
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2199
	}
2200 2201
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2202 2203 2204
	return 1;
}

2205
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
 * 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
2218
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2219 2220 2221
 * 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.
 */
2222 2223
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
{
	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;
	}

2235
	if (bdev_read_only(sb->s_bdev)) {
2236 2237
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2238 2239 2240
		return;
	}

2241 2242 2243 2244 2245 2246 2247
	/* 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;
	}

2248
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2249 2250
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2251
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2252
				  "clearing orphan list.\n");
2253 2254
			es->s_last_orphan = 0;
		}
2255 2256 2257 2258 2259
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2260
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2261 2262 2263 2264 2265 2266
		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
2267
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2268 2269
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2270
			if (ret < 0)
2271 2272 2273
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2274 2275 2276 2277 2278 2279 2280
		}
	}
#endif

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

2281 2282
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2283 2284 2285 2286
			es->s_last_orphan = 0;
			break;
		}

2287
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2288
		dquot_initialize(inode);
2289
		if (inode->i_nlink) {
2290 2291 2292 2293
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2294
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2295
				  inode->i_ino, inode->i_size);
A
Al Viro 已提交
2296
			inode_lock(inode);
2297
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2298
			ext4_truncate(inode);
A
Al Viro 已提交
2299
			inode_unlock(inode);
2300 2301
			nr_truncates++;
		} else {
2302 2303 2304 2305
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2306 2307 2308 2309 2310 2311 2312
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2313
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2314 2315

	if (nr_orphans)
2316 2317
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2318
	if (nr_truncates)
2319 2320
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2321 2322
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2323
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2324
		if (sb_dqopt(sb)->files[i])
2325
			dquot_quota_off(sb, i);
2326 2327 2328 2329
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2330

2331 2332 2333 2334 2335 2336 2337
/*
 * 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.
 *
2338 2339 2340 2341 2342 2343
 * 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.
 *
2344 2345
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2346
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2347 2348 2349 2350 2351
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2352
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2353
		/*
2354
		 * CONFIG_LBDAF is not enabled implies the inode
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364
		 * 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;
	}

2365 2366 2367 2368 2369 2370
	/*
	 * 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;
2371 2372 2373 2374 2375 2376 2377 2378
	res <<= blkbits;

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

	return res;
}
2379 2380

/*
2381
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2382 2383
 * 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.
2384
 */
2385
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2386
{
2387
	loff_t res = EXT4_NDIR_BLOCKS;
2388 2389
	int meta_blocks;
	loff_t upper_limit;
2390 2391 2392 2393 2394 2395
	/* 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.
2396 2397
	 */

2398
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2399
		/*
2400
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2401 2402
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2403 2404 2405 2406 2407 2408 2409
		 */
		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
2410 2411 2412 2413 2414 2415
		/*
		 * 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
		 */
2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428
		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;
2429 2430 2431 2432 2433 2434 2435

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2436 2437 2438 2439

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2440 2441 2442
	return res;
}

2443
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2444
				   ext4_fsblk_t logical_sb_block, int nr)
2445
{
2446
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2447
	ext4_group_t bg, first_meta_bg;
2448 2449 2450 2451
	int has_super = 0;

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

2452
	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2453
		return logical_sb_block + nr + 1;
2454
	bg = sbi->s_desc_per_block * nr;
2455
	if (ext4_bg_has_super(sb, bg))
2456
		has_super = 1;
2457

2458 2459 2460 2461 2462 2463 2464 2465 2466 2467
	/*
	 * 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++;

2468
	return (has_super + ext4_group_first_block_no(sb, bg));
2469 2470
}

2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486
/**
 * 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
2487
	int ret;
2488 2489

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2490 2491 2492 2493 2494 2495 2496
		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;
2497

D
Dan Ehrenberg 已提交
2498 2499 2500 2501 2502 2503
	/*
	 * 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;
2504

D
Dan Ehrenberg 已提交
2505
	return ret;
2506
}
2507

2508 2509 2510 2511 2512 2513 2514 2515
/*
 * 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)
{
2516
	if (ext4_has_unknown_ext4_incompat_features(sb)) {
2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527
		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;

2528
	if (ext4_has_feature_readonly(sb)) {
D
Darrick J. Wong 已提交
2529 2530 2531 2532 2533
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2534
	/* Check that feature set is OK for a read-write mount */
2535
	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
		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
	 */
2546
	if (ext4_has_feature_huge_file(sb)) {
2547 2548 2549 2550 2551 2552 2553
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2554
	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2555 2556 2557 2558 2559
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2560 2561

#ifndef CONFIG_QUOTA
2562
	if (ext4_has_feature_quota(sb) && !readonly) {
2563 2564 2565 2566 2567
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
L
Li Xi 已提交
2568 2569 2570 2571 2572 2573
	if (ext4_has_feature_project(sb) && !readonly) {
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with project quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
2574
#endif  /* CONFIG_QUOTA */
2575 2576 2577
	return 1;
}

2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591
/*
 * 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)
2592 2593
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2594 2595
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2596
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609
		       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) {
2610
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625
		       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 */
}

2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637
/* 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;

2638
	sb_start_write(sb);
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649
	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;
	}

2650
	if (group >= ngroups)
2651 2652 2653 2654 2655 2656 2657
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2658 2659
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2660 2661 2662 2663 2664
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2665
	sb_end_write(sb);
2666 2667 2668 2669 2670 2671

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2672
 * request structure. Should be called with li_list_mtx held
2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689
 */
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)
{
2690 2691 2692
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2693
		return;
2694
	}
2695 2696

	mutex_lock(&ext4_li_info->li_list_mtx);
2697
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2698
	mutex_unlock(&ext4_li_info->li_list_mtx);
2699
	mutex_unlock(&ext4_li_mtx);
2700 2701
}

2702 2703
static struct task_struct *ext4_lazyinit_task;

2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717
/*
 * 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;
2718
	unsigned long next_wakeup, cur;
2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735

	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);

2736 2737 2738 2739 2740 2741
			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;
				}
2742 2743 2744 2745 2746 2747 2748
			}

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

2749
		try_to_freeze();
2750

2751 2752
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2753
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2754 2755 2756 2757
			cond_resched();
			continue;
		}

2758 2759
		schedule_timeout_interruptible(next_wakeup - cur);

2760 2761 2762 2763
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2764 2765 2766 2767 2768 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
	}

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)
{
2806 2807 2808 2809
	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);
2810 2811 2812
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2813
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
				 "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.
	 */
2882 2883
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
2884 2885 2886
	return elr;
}

2887 2888
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
2889 2890
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2891
	struct ext4_li_request *elr = NULL;
2892
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2893
	int ret = 0;
2894

2895
	mutex_lock(&ext4_li_mtx);
2896 2897 2898 2899 2900 2901
	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;
2902
		goto out;
2903
	}
2904 2905 2906

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
2907
	    !test_opt(sb, INIT_INODE_TABLE))
2908
		goto out;
2909 2910

	elr = ext4_li_request_new(sb, first_not_zeroed);
2911 2912 2913 2914
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926

	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;
2927 2928 2929 2930 2931 2932
	/*
	 * 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;
2933 2934 2935 2936 2937 2938 2939

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
2940 2941
	mutex_unlock(&ext4_li_mtx);
	if (ret)
2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955
		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.
	 */
2956
	if (!ext4_li_info || !ext4_lazyinit_task)
2957 2958
		return;

2959
	kthread_stop(ext4_lazyinit_task);
2960 2961
}

2962 2963 2964 2965 2966 2967
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);

2968
	if (ext4_has_metadata_csum(sb)) {
2969
		/* journal checksum v3 */
2970
		compat = 0;
2971
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
2972 2973 2974 2975 2976 2977
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

2978 2979 2980 2981
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
	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 {
2994 2995
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2996 2997 2998 2999 3000
	}

	return ret;
}

3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
/*
 * 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;

3025
	if (!ext4_has_feature_bigalloc(sb))
3026 3027 3028
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077
	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;
3078
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105

	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();
	}
3106 3107
	/* Add the internal journal blocks as well */
	if (sbi->s_journal && !sbi->journal_bdev)
3108
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3109

3110 3111 3112 3113 3114 3115
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3116
static void ext4_set_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3117 3118
{
	ext4_fsblk_t resv_clusters;
3119
	struct ext4_sb_info *sbi = EXT4_SB(sb);
L
Lukas Czerner 已提交
3120

3121 3122 3123 3124 3125 3126
	/*
	 * 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.
	 */
3127
	if (!ext4_has_feature_extents(sb))
3128
		return;
L
Lukas Czerner 已提交
3129 3130 3131 3132
	/*
	 * 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
3133
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3134 3135 3136
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3137 3138
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
L
Lukas Czerner 已提交
3139 3140 3141 3142

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

3143
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
L
Lukas Czerner 已提交
3144 3145
}

3146
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3147
{
3148
	char *orig_data = kstrdup(data, GFP_KERNEL);
3149
	struct buffer_head *bh;
3150 3151 3152 3153
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3154
	ext4_fsblk_t logical_sb_block;
3155 3156 3157 3158
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3159
	const char *descr;
3160
	int ret = -ENOMEM;
3161
	int blocksize, clustersize;
3162 3163
	unsigned int db_count;
	unsigned int i;
3164
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3165
	__u64 blocks_count;
3166
	int err = 0;
3167
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3168
	ext4_group_t first_not_zeroed;
3169 3170 3171

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3172
		goto out_free_orig;
3173 3174 3175 3176 3177

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3178
		goto out_free_orig;
3179
	}
3180
	sb->s_fs_info = sbi;
3181
	sbi->s_sb = sb;
3182
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3183
	sbi->s_sb_block = sb_block;
3184 3185 3186
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3187

3188
	/* Cleanup superblock name */
3189
	strreplace(sb->s_id, '/', '!');
3190

3191
	/* -EINVAL is default */
3192
	ret = -EINVAL;
3193
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3194
	if (!blocksize) {
3195
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3196 3197 3198 3199
		goto out_fail;
	}

	/*
3200
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3201 3202
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3203
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3204 3205
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3206
	} else {
3207
		logical_sb_block = sb_block;
3208 3209
	}

3210
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3211
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3212 3213 3214 3215
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3216
	 *       some ext4 macro-instructions depend on its value
3217
	 */
3218
	es = (struct ext4_super_block *) (bh->b_data + offset);
3219 3220
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3221 3222
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3223
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3224

3225
	/* Warn if metadata_csum and gdt_csum are both set. */
3226 3227
	if (ext4_has_feature_metadata_csum(sb) &&
	    ext4_has_feature_gdt_csum(sb))
3228
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3229 3230
			     "redundant flags; please run fsck.");

3231 3232 3233 3234 3235 3236 3237 3238
	/* 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;
	}

3239
	/* Load the checksum driver */
3240
	if (ext4_has_feature_metadata_csum(sb)) {
3241 3242 3243 3244 3245 3246 3247 3248 3249
		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;
		}
	}

3250 3251 3252 3253 3254
	/* 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;
3255
		ret = -EFSBADCRC;
3256 3257 3258 3259
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3260
	if (ext4_has_feature_csum_seed(sb))
3261 3262
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3263 3264 3265
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3266 3267
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3268
	set_opt(sb, INIT_INODE_TABLE);
3269
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3270
		set_opt(sb, DEBUG);
3271
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3272
		set_opt(sb, GRPID);
3273
	if (def_mount_opts & EXT4_DEFM_UID16)
3274
		set_opt(sb, NO_UID32);
3275 3276
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3277
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3278
	set_opt(sb, POSIX_ACL);
3279
#endif
3280 3281 3282 3283
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3284
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3285
		set_opt(sb, JOURNAL_DATA);
3286
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3287
		set_opt(sb, ORDERED_DATA);
3288
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3289
		set_opt(sb, WRITEBACK_DATA);
3290 3291

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3292
		set_opt(sb, ERRORS_PANIC);
3293
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3294
		set_opt(sb, ERRORS_CONT);
3295
	else
3296
		set_opt(sb, ERRORS_RO);
3297 3298
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3299
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3300
		set_opt(sb, DISCARD);
3301

3302 3303
	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));
3304 3305 3306
	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;
3307

3308
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3309
		set_opt(sb, BARRIER);
3310

3311 3312 3313 3314
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3315
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3316
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3317
		set_opt(sb, DELALLOC);
3318

3319 3320 3321 3322 3323 3324
	/*
	 * 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;

3325
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3326
			   &journal_devnum, &journal_ioprio, 0)) {
3327 3328 3329 3330
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3331
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3332
	if (!parse_options((char *) data, sb, &journal_devnum,
3333
			   &journal_ioprio, 0))
3334 3335
		goto failed_mount;

3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346
	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 "
3347
				 "both data=journal and dioread_nolock");
3348 3349
			goto failed_mount;
		}
R
Ross Zwisler 已提交
3350 3351 3352 3353 3354
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3355 3356
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3357 3358
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3359 3360
	}

3361
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3362
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3363

3364
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3365 3366 3367
	    (ext4_has_compat_features(sb) ||
	     ext4_has_ro_compat_features(sb) ||
	     ext4_has_incompat_features(sb)))
3368 3369 3370
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3371

3372 3373
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
3374
		if (ext4_has_feature_64bit(sb)) {
3375 3376 3377 3378 3379 3380
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402
	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;
		}
	}

3403 3404 3405 3406 3407
	/*
	 * 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.
	 */
3408
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3409
		goto failed_mount;
3410

J
Jan Kara 已提交
3411
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3412 3413
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3414 3415
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3416 3417 3418
		goto failed_mount;
	}

3419 3420 3421 3422 3423 3424 3425
	if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
		ext4_msg(sb, KERN_ERR,
			 "Number of reserved GDT blocks insanely large: %d",
			 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
		goto failed_mount;
	}

R
Ross Zwisler 已提交
3426
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3427 3428
		err = bdev_dax_supported(sb, blocksize);
		if (err)
R
Ross Zwisler 已提交
3429 3430 3431
			goto failed_mount;
	}

3432
	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3433 3434 3435 3436 3437
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3438
	if (sb->s_blocksize != blocksize) {
3439 3440
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3441
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3442
					blocksize);
3443 3444 3445
			goto failed_mount;
		}

3446
		brelse(bh);
3447 3448
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3449
		bh = sb_bread_unmovable(sb, logical_sb_block);
3450
		if (!bh) {
3451 3452
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3453 3454
			goto failed_mount;
		}
3455
		es = (struct ext4_super_block *)(bh->b_data + offset);
3456
		sbi->s_es = es;
3457
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3458 3459
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3460 3461 3462 3463
			goto failed_mount;
		}
	}

3464
	has_huge_files = ext4_has_feature_huge_file(sb);
3465 3466 3467
	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);
3468

3469 3470 3471
	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;
3472 3473 3474
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3475
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3476
		    (!is_power_of_2(sbi->s_inode_size)) ||
3477
		    (sbi->s_inode_size > blocksize)) {
3478 3479
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3480
			       sbi->s_inode_size);
3481 3482
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3483 3484
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3485
	}
3486

3487
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3488
	if (ext4_has_feature_64bit(sb)) {
3489
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3490
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3491
		    !is_power_of_2(sbi->s_desc_size)) {
3492 3493
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3494 3495 3496 3497 3498
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3499

3500 3501
	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);
3502
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3503
		goto cantfind_ext4;
3504

3505
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3506
	if (sbi->s_inodes_per_block == 0)
3507
		goto cantfind_ext4;
3508 3509
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3510
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3511 3512
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3513 3514
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3515

3516
	for (i = 0; i < 4; i++)
3517 3518
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3519
	if (ext4_has_feature_dir_index(sb)) {
3520 3521 3522 3523
		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) {
3524
#ifdef __CHAR_UNSIGNED__
3525 3526 3527 3528
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3529
#else
3530 3531 3532
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3533
#endif
3534
		}
3535
	}
3536

3537 3538
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3539
	has_bigalloc = ext4_has_feature_bigalloc(sb);
3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579
	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;
3580
	}
3581 3582
	sbi->s_cluster_ratio = clustersize / blocksize;

3583
	if (sbi->s_inodes_per_group > blocksize * 8) {
3584 3585
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3586
		       sbi->s_inodes_per_group);
3587 3588 3589
		goto failed_mount;
	}

3590 3591 3592 3593
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3594 3595 3596 3597
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3598
	err = generic_check_addressable(sb->s_blocksize_bits,
3599
					ext4_blocks_count(es));
3600
	if (err) {
3601
		ext4_msg(sb, KERN_ERR, "filesystem"
3602
			 " too large to mount safely on this system");
3603
		if (sizeof(sector_t) < 8)
3604
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3605 3606 3607
		goto failed_mount;
	}

3608 3609
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3610

3611 3612 3613
	/* 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) {
3614 3615
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3616 3617 3618 3619
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3620 3621 3622 3623 3624
	/*
	 * 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)) {
3625
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3626 3627 3628
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3629 3630
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3631 3632 3633 3634
	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));
3635
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3636
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3637
		       "(block count %llu, first data block %u, "
3638
		       "blocks per group %lu)", sbi->s_groups_count,
3639 3640 3641 3642 3643
		       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
3644
	sbi->s_groups_count = blocks_count;
3645 3646
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3647 3648
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3649 3650 3651
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3652
	if (sbi->s_group_desc == NULL) {
3653
		ext4_msg(sb, KERN_ERR, "not enough memory");
3654
		ret = -ENOMEM;
3655 3656 3657
		goto failed_mount;
	}

3658
	bgl_lock_init(sbi->s_blockgroup_lock);
3659 3660

	for (i = 0; i < db_count; i++) {
3661
		block = descriptor_loc(sb, logical_sb_block, i);
3662
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3663
		if (!sbi->s_group_desc[i]) {
3664 3665
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3666 3667 3668 3669
			db_count = i;
			goto failed_mount2;
		}
	}
3670
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3671
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3672
		ret = -EFSCORRUPTED;
3673
		goto failed_mount2;
3674
	}
3675

3676
	sbi->s_gdb_count = db_count;
3677 3678 3679
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3680 3681
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3682

3683
	/* Register extent status tree shrinker */
3684
	if (ext4_es_register_shrinker(sbi))
3685 3686
		goto failed_mount3;

3687
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3688
	sbi->s_extent_max_zeroout_kb = 32;
3689

3690 3691 3692
	/*
	 * set up enough so that it can read an inode
	 */
3693
	sb->s_op = &ext4_sops;
3694 3695
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3696
#ifdef CONFIG_QUOTA
3697
	sb->dq_op = &ext4_quota_operations;
3698
	if (ext4_has_feature_quota(sb))
3699
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3700 3701
	else
		sb->s_qcop = &ext4_qctl_operations;
L
Li Xi 已提交
3702
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
3703
#endif
3704 3705
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3706
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3707
	mutex_init(&sbi->s_orphan_lock);
3708 3709 3710 3711

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3712
			  ext4_has_feature_journal_needs_recovery(sb));
3713

3714
	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
3715
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3716
			goto failed_mount3a;
3717

3718 3719 3720 3721
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
3722
	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
3723
		if (ext4_load_journal(sb, es, journal_devnum))
3724
			goto failed_mount3a;
3725
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3726
		   ext4_has_feature_journal_needs_recovery(sb)) {
3727 3728
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3729
		goto failed_mount_wq;
3730
	} else {
3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755
		/* 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);
3756
		clear_opt(sb, DATA_FLAGS);
3757 3758 3759
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3760 3761
	}

3762
	if (ext4_has_feature_64bit(sb) &&
3763 3764
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3765
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3766
		goto failed_mount_wq;
3767 3768
	}

3769 3770 3771 3772
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3773
	}
3774

3775 3776 3777 3778 3779
	/* 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
3780 3781 3782
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3783 3784
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3785
			set_opt(sb, ORDERED_DATA);
3786
		else
3787
			set_opt(sb, JOURNAL_DATA);
3788 3789
		break;

3790 3791
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3792 3793
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3794 3795
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3796
			goto failed_mount_wq;
3797 3798 3799 3800
		}
	default:
		break;
	}
3801
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3802

B
Bobi Jam 已提交
3803 3804
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3805
no_journal:
3806 3807 3808 3809
	sbi->s_mb_cache = ext4_xattr_create_cache();
	if (!sbi->s_mb_cache) {
		ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
		goto failed_mount_wq;
3810 3811
	}

3812
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
3813
	    (blocksize != PAGE_SIZE)) {
3814 3815 3816 3817 3818
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

3819 3820 3821
	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
	    !ext4_has_feature_encrypt(sb)) {
		ext4_set_feature_encrypt(sb);
3822 3823 3824
		ext4_commit_super(sb, 1);
	}

3825 3826 3827 3828 3829 3830 3831
	/*
	 * 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 {
3832 3833
		err = ext4_calculate_overhead(sb);
		if (err)
3834 3835 3836
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
3837 3838 3839 3840
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3841 3842 3843 3844
	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");
3845
		ret = -ENOMEM;
3846 3847 3848
		goto failed_mount4;
	}

3849
	/*
3850
	 * The jbd2_journal_load will have done any necessary log recovery,
3851 3852 3853
	 * so we can safely mount the rest of the filesystem now.
	 */

3854 3855
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
3856
		ext4_msg(sb, KERN_ERR, "get root inode failed");
3857
		ret = PTR_ERR(root);
3858
		root = NULL;
3859 3860 3861
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3862
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
3863
		iput(root);
3864 3865
		goto failed_mount4;
	}
3866
	sb->s_root = d_make_root(root);
3867
	if (!sb->s_root) {
3868
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
3869 3870 3871
		ret = -ENOMEM;
		goto failed_mount4;
	}
3872

3873 3874
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
3875 3876 3877 3878 3879

	/* 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;
3880
		if (ext4_has_feature_extra_isize(sb)) {
K
Kalpak Shah 已提交
3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895
			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;
3896 3897
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
3898 3899
	}

3900
	ext4_set_resv_clusters(sb);
L
Lukas Czerner 已提交
3901

3902 3903
	err = ext4_setup_system_zone(sb);
	if (err) {
3904
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
3905
			 "zone (%d)", err);
3906 3907 3908 3909 3910 3911 3912 3913
		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);
3914
		goto failed_mount5;
3915 3916
	}

3917 3918 3919
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
3920 3921
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
3922 3923 3924
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
3925 3926
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
3927 3928 3929
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
3930
					  ext4_count_dirs(sb), GFP_KERNEL);
3931
	if (!err)
3932 3933
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
3934 3935 3936
	if (!err)
		err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);

3937 3938 3939 3940 3941
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

3942
	if (ext4_has_feature_flex_bg(sb))
3943 3944 3945 3946 3947 3948 3949
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

3950 3951
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
3952
		goto failed_mount6;
3953

3954
	err = ext4_register_sysfs(sb);
3955 3956
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
3957

3958 3959
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
3960
	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
3961 3962 3963 3964 3965 3966
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

3967 3968 3969
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3970
	if (needs_recovery) {
3971
		ext4_msg(sb, KERN_INFO, "recovery complete");
3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983
		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";

3984 3985 3986 3987 3988 3989 3990 3991
	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");
	}

3992 3993 3994 3995
	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);
3996

3997 3998
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3999

4000 4001 4002 4003 4004
	/* 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);

4005
	kfree(orig_data);
4006 4007
	return 0;

4008
cantfind_ext4:
4009
	if (!silent)
4010
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4011 4012
	goto failed_mount;

4013 4014
#ifdef CONFIG_QUOTA
failed_mount8:
4015
	ext4_unregister_sysfs(sb);
4016
#endif
4017 4018 4019
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4020
	ext4_mb_release(sb);
4021
	if (sbi->s_flex_groups)
A
Al Viro 已提交
4022
		kvfree(sbi->s_flex_groups);
4023 4024 4025 4026
	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);
4027
failed_mount5:
4028 4029 4030
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4031
	dput(sb->s_root);
4032
	sb->s_root = NULL;
A
Al Viro 已提交
4033
failed_mount4:
4034
	ext4_msg(sb, KERN_ERR, "mount failed");
4035 4036
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4037
failed_mount_wq:
J
Jan Kara 已提交
4038 4039 4040 4041
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
4042 4043 4044 4045
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4046
failed_mount3a:
4047
	ext4_es_unregister_shrinker(sbi);
4048
failed_mount3:
4049
	del_timer_sync(&sbi->s_err_report);
4050 4051
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4052 4053 4054
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
4055
	kvfree(sbi->s_group_desc);
4056
failed_mount:
4057 4058
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4059
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4060
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4061 4062
		kfree(sbi->s_qf_names[i]);
#endif
4063
	ext4_blkdev_remove(sbi);
4064 4065 4066
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4067
	kfree(sbi->s_blockgroup_lock);
4068
	kfree(sbi);
4069
out_free_orig:
4070
	kfree(orig_data);
4071
	return err ? err : ret;
4072 4073 4074 4075 4076 4077 4078
}

/*
 * 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.
 */
4079
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4080
{
4081
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4082

4083 4084 4085
	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;
4086

4087
	write_lock(&journal->j_state_lock);
4088
	if (test_opt(sb, BARRIER))
4089
		journal->j_flags |= JBD2_BARRIER;
4090
	else
4091
		journal->j_flags &= ~JBD2_BARRIER;
4092 4093 4094 4095
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4096
	write_unlock(&journal->j_state_lock);
4097 4098
}

4099
static journal_t *ext4_get_journal(struct super_block *sb,
4100 4101 4102 4103 4104
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4105
	BUG_ON(!ext4_has_feature_journal(sb));
4106

4107 4108 4109 4110
	/* 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. */

4111 4112
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4113
		ext4_msg(sb, KERN_ERR, "no journal found");
4114 4115 4116 4117 4118
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4119
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4120 4121 4122
		return NULL;
	}

4123
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4124
		  journal_inode, journal_inode->i_size);
4125
	if (!S_ISREG(journal_inode->i_mode)) {
4126
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4127 4128 4129 4130
		iput(journal_inode);
		return NULL;
	}

4131
	journal = jbd2_journal_init_inode(journal_inode);
4132
	if (!journal) {
4133
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4134 4135 4136 4137
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4138
	ext4_init_journal_params(sb, journal);
4139 4140 4141
	return journal;
}

4142
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4143 4144
				       dev_t j_dev)
{
4145
	struct buffer_head *bh;
4146
	journal_t *journal;
4147 4148
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4149
	int hblock, blocksize;
4150
	ext4_fsblk_t sb_block;
4151
	unsigned long offset;
4152
	struct ext4_super_block *es;
4153 4154
	struct block_device *bdev;

4155
	BUG_ON(!ext4_has_feature_journal(sb));
4156

4157
	bdev = ext4_blkdev_get(j_dev, sb);
4158 4159 4160 4161
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4162
	hblock = bdev_logical_block_size(bdev);
4163
	if (blocksize < hblock) {
4164 4165
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4166 4167 4168
		goto out_bdev;
	}

4169 4170
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4171 4172
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4173 4174
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4175 4176 4177
		goto out_bdev;
	}

4178
	es = (struct ext4_super_block *) (bh->b_data + offset);
4179
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4180
	    !(le32_to_cpu(es->s_feature_incompat) &
4181
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4182 4183
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4184 4185 4186 4187
		brelse(bh);
		goto out_bdev;
	}

4188 4189 4190 4191 4192 4193 4194 4195 4196
	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;
	}

4197
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4198
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4199 4200 4201 4202
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4203
	len = ext4_blocks_count(es);
4204 4205 4206
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4207
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4208 4209
					start, len, blocksize);
	if (!journal) {
4210
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4211 4212 4213
		goto out_bdev;
	}
	journal->j_private = sb;
4214
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4215 4216
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4217
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4218 4219 4220
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4221 4222
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4223 4224 4225
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4226 4227
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4228
	return journal;
4229

4230
out_journal:
4231
	jbd2_journal_destroy(journal);
4232
out_bdev:
4233
	ext4_blkdev_put(bdev);
4234 4235 4236
	return NULL;
}

4237 4238
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4239 4240 4241 4242 4243 4244 4245 4246
			     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;

4247
	BUG_ON(!ext4_has_feature_journal(sb));
4248

4249 4250
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4251 4252
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263
		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.
	 */
4264
	if (ext4_has_feature_journal_needs_recovery(sb)) {
4265
		if (sb->s_flags & MS_RDONLY) {
4266 4267
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4268
			if (really_read_only) {
4269 4270
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4271 4272
				return -EROFS;
			}
4273 4274
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4275 4276 4277 4278
		}
	}

	if (journal_inum && journal_dev) {
4279 4280
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4281 4282 4283 4284
		return -EINVAL;
	}

	if (journal_inum) {
4285
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4286 4287
			return -EINVAL;
	} else {
4288
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4289 4290 4291
			return -EINVAL;
	}

4292
	if (!(journal->j_flags & JBD2_BARRIER))
4293
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4294

4295
	if (!ext4_has_feature_journal_needs_recovery(sb))
4296
		err = jbd2_journal_wipe(journal, !really_read_only);
4297 4298 4299 4300 4301
	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);
4302
		err = jbd2_journal_load(journal);
4303 4304 4305 4306 4307
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4308 4309

	if (err) {
4310
		ext4_msg(sb, KERN_ERR, "error loading journal");
4311
		jbd2_journal_destroy(journal);
4312 4313 4314
		return err;
	}

4315 4316
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4317

4318
	if (!really_read_only && journal_devnum &&
4319 4320 4321 4322
	    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. */
4323
		ext4_commit_super(sb, 1);
4324 4325 4326 4327 4328
	}

	return 0;
}

4329
static int ext4_commit_super(struct super_block *sb, int sync)
4330
{
4331
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4332
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4333
	int error = 0;
4334

4335
	if (!sbh || block_device_ejected(sb))
4336
		return error;
4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348
	/*
	 * 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());
4349 4350 4351
	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
4352 4353
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4354 4355 4356
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4357 4358
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4359 4360
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4361 4362 4363
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4364
				&EXT4_SB(sb)->s_freeinodes_counter));
4365
	BUFFER_TRACE(sbh, "marking dirty");
4366
	ext4_superblock_csum_set(sb);
4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381
	lock_buffer(sbh);
	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.
		 */
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4382
	mark_buffer_dirty(sbh);
4383
	unlock_buffer(sbh);
4384
	if (sync) {
4385 4386
		error = __sync_dirty_buffer(sbh,
			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4387 4388 4389 4390 4391
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4392 4393
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4394 4395 4396 4397
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4398
	return error;
4399 4400 4401 4402 4403 4404 4405
}

/*
 * 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.
 */
4406 4407
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4408
{
4409
	journal_t *journal = EXT4_SB(sb)->s_journal;
4410

4411
	if (!ext4_has_feature_journal(sb)) {
4412 4413 4414
		BUG_ON(journal != NULL);
		return;
	}
4415
	jbd2_journal_lock_updates(journal);
4416 4417 4418
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4419
	if (ext4_has_feature_journal_needs_recovery(sb) &&
4420
	    sb->s_flags & MS_RDONLY) {
4421
		ext4_clear_feature_journal_needs_recovery(sb);
4422
		ext4_commit_super(sb, 1);
4423
	}
4424 4425

out:
4426
	jbd2_journal_unlock_updates(journal);
4427 4428 4429 4430 4431 4432 4433
}

/*
 * 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.
 */
4434 4435
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4436 4437 4438 4439 4440
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4441
	BUG_ON(!ext4_has_feature_journal(sb));
4442

4443
	journal = EXT4_SB(sb)->s_journal;
4444 4445 4446

	/*
	 * Now check for any error status which may have been recorded in the
4447
	 * journal by a prior ext4_error() or ext4_abort()
4448 4449
	 */

4450
	j_errno = jbd2_journal_errno(journal);
4451 4452 4453
	if (j_errno) {
		char nbuf[16];

4454
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4455
		ext4_warning(sb, "Filesystem error recorded "
4456
			     "from previous mount: %s", errstr);
4457
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4458

4459 4460
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4461
		ext4_commit_super(sb, 1);
4462

4463
		jbd2_journal_clear_err(journal);
4464
		jbd2_journal_update_sb_errno(journal);
4465 4466 4467 4468 4469 4470 4471
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4472
int ext4_force_commit(struct super_block *sb)
4473 4474 4475 4476 4477 4478
{
	journal_t *journal;

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

4479
	journal = EXT4_SB(sb)->s_journal;
4480
	return ext4_journal_force_commit(journal);
4481 4482
}

4483
static int ext4_sync_fs(struct super_block *sb, int wait)
4484
{
4485
	int ret = 0;
4486
	tid_t target;
4487
	bool needs_barrier = false;
4488
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4489

4490
	trace_ext4_sync_fs(sb, wait);
4491
	flush_workqueue(sbi->rsv_conversion_wq);
4492 4493 4494 4495 4496
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4497 4498 4499 4500 4501
	/*
	 * 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.
	 */
4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513
	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))
4514 4515 4516 4517 4518 4519
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4520
	}
4521 4522 4523 4524

	return ret;
}

4525 4526 4527
/*
 * 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.
4528 4529
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4530 4531
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4532
 */
4533
static int ext4_freeze(struct super_block *sb)
4534
{
4535 4536
	int error = 0;
	journal_t *journal;
4537

4538 4539
	if (sb->s_flags & MS_RDONLY)
		return 0;
4540

4541
	journal = EXT4_SB(sb)->s_journal;
4542

4543 4544 4545
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4546

4547 4548 4549 4550 4551 4552 4553
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4554 4555

		/* Journal blocked and flushed, clear needs_recovery flag. */
4556
		ext4_clear_feature_journal_needs_recovery(sb);
4557
	}
4558 4559

	error = ext4_commit_super(sb, 1);
4560
out:
4561 4562 4563
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4564
	return error;
4565 4566 4567 4568 4569 4570
}

/*
 * 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.
 */
4571
static int ext4_unfreeze(struct super_block *sb)
4572
{
4573 4574 4575
	if (sb->s_flags & MS_RDONLY)
		return 0;

4576 4577
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
4578
		ext4_set_feature_journal_needs_recovery(sb);
4579 4580
	}

4581
	ext4_commit_super(sb, 1);
4582
	return 0;
4583 4584
}

4585 4586 4587 4588 4589
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4590
	unsigned long s_mount_opt2;
4591 4592
	kuid_t s_resuid;
	kgid_t s_resgid;
4593 4594 4595 4596
	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
4597
	char *s_qf_names[EXT4_MAXQUOTAS];
4598 4599 4600
#endif
};

4601
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4602
{
4603
	struct ext4_super_block *es;
4604
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4605
	unsigned long old_sb_flags;
4606
	struct ext4_mount_options old_opts;
4607
	int enable_quota = 0;
4608
	ext4_group_t g;
4609
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4610
	int err = 0;
4611
#ifdef CONFIG_QUOTA
4612
	int i, j;
4613
#endif
4614
	char *orig_data = kstrdup(data, GFP_KERNEL);
4615 4616 4617 4618

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4619
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4620 4621 4622
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4623 4624
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4625 4626
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4627
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4628 4629 4630 4631 4632 4633
		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]);
4634
				kfree(orig_data);
4635 4636 4637 4638
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4639
#endif
4640 4641
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4642

4643
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4644 4645 4646 4647
		err = -EINVAL;
		goto restore_opts;
	}

4648
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4649 4650
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4651 4652
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4653 4654
	}

4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667
	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
4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679
		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;
4680 4681
	}

4682
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4683
		ext4_abort(sb, "Abort forced by user");
4684 4685

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4686
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4687 4688 4689

	es = sbi->s_es;

4690
	if (sbi->s_journal) {
4691
		ext4_init_journal_params(sb, sbi->s_journal);
4692 4693
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4694

4695 4696 4697
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4698
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4699
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4700 4701 4702 4703 4704
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4705 4706 4707
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4708 4709
			err = dquot_suspend(sb, -1);
			if (err < 0)
4710 4711
				goto restore_opts;

4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722
			/*
			 * 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.
			 */
4723 4724
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4725 4726
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4727
			if (sbi->s_journal)
4728
				ext4_mark_recovery_complete(sb, es);
4729
		} else {
4730
			/* Make sure we can mount this feature set readwrite */
4731
			if (ext4_has_feature_readonly(sb) ||
D
Darrick J. Wong 已提交
4732
			    !ext4_feature_set_ok(sb, 0)) {
4733 4734 4735
				err = -EROFS;
				goto restore_opts;
			}
4736 4737
			/*
			 * Make sure the group descriptor checksums
4738
			 * are sane.  If they aren't, refuse to remount r/w.
4739 4740 4741 4742 4743
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4744
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4745 4746
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4747
		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
4748
					       le16_to_cpu(gdp->bg_checksum));
4749
					err = -EFSBADCRC;
4750 4751 4752 4753
					goto restore_opts;
				}
			}

4754 4755 4756 4757 4758 4759
			/*
			 * 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) {
4760
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4761 4762
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4763
				       "umount/remount instead");
4764 4765 4766 4767
				err = -EINVAL;
				goto restore_opts;
			}

4768 4769 4770 4771 4772 4773
			/*
			 * 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.)
			 */
4774 4775
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4776
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4777
			if (!ext4_setup_super(sb, es, 0))
4778
				sb->s_flags &= ~MS_RDONLY;
4779
			if (ext4_has_feature_mmp(sb))
4780 4781 4782 4783 4784
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4785
			enable_quota = 1;
4786 4787
		}
	}
4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800

	/*
	 * 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);
	}

4801
	ext4_setup_system_zone(sb);
4802
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4803
		ext4_commit_super(sb, 1);
4804

4805 4806
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
4807
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4808
		kfree(old_opts.s_qf_names[i]);
4809 4810 4811
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
4812
		else if (ext4_has_feature_quota(sb)) {
4813
			err = ext4_enable_quotas(sb);
4814
			if (err)
4815 4816 4817
				goto restore_opts;
		}
	}
4818
#endif
4819

4820
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
4821 4822
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4823
	return 0;
4824

4825 4826 4827
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4828
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4829 4830 4831
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4832 4833
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4834 4835
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
4836
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
4837
		kfree(sbi->s_qf_names[i]);
4838 4839 4840
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4841
	kfree(orig_data);
4842 4843 4844
	return err;
}

L
Li Xi 已提交
4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886
#ifdef CONFIG_QUOTA
static int ext4_statfs_project(struct super_block *sb,
			       kprojid_t projid, struct kstatfs *buf)
{
	struct kqid qid;
	struct dquot *dquot;
	u64 limit;
	u64 curblock;

	qid = make_kqid_projid(projid);
	dquot = dqget(sb, qid);
	if (IS_ERR(dquot))
		return PTR_ERR(dquot);
	spin_lock(&dq_data_lock);

	limit = (dquot->dq_dqb.dqb_bsoftlimit ?
		 dquot->dq_dqb.dqb_bsoftlimit :
		 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
	if (limit && buf->f_blocks > limit) {
		curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
		buf->f_blocks = limit;
		buf->f_bfree = buf->f_bavail =
			(buf->f_blocks > curblock) ?
			 (buf->f_blocks - curblock) : 0;
	}

	limit = dquot->dq_dqb.dqb_isoftlimit ?
		dquot->dq_dqb.dqb_isoftlimit :
		dquot->dq_dqb.dqb_ihardlimit;
	if (limit && buf->f_files > limit) {
		buf->f_files = limit;
		buf->f_ffree =
			(buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
			 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
	}

	spin_unlock(&dq_data_lock);
	dqput(dquot);
	return 0;
}
#endif

4887
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4888 4889
{
	struct super_block *sb = dentry->d_sb;
4890 4891
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
4892
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
4893
	u64 fsid;
4894
	s64 bfree;
L
Lukas Czerner 已提交
4895
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4896

4897 4898
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
4899

4900
	buf->f_type = EXT4_SUPER_MAGIC;
4901
	buf->f_bsize = sb->s_blocksize;
4902
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4903 4904
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4905
	/* prevent underflow in case that few free space is available */
4906
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
4907 4908 4909
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4910 4911
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
4912
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4913
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
4914 4915 4916 4917
	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;
4918

L
Li Xi 已提交
4919 4920 4921 4922 4923
#ifdef CONFIG_QUOTA
	if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
	    sb_has_quota_limits_enabled(sb, PRJQUOTA))
		ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
#endif
4924 4925 4926
	return 0;
}

4927 4928
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
4929
 * Process 1                         Process 2
4930
 * ext4_create()                     quota_sync()
4931
 *   jbd2_journal_start()                  write_dquot()
4932
 *   dquot_initialize()                         down(dqio_mutex)
4933
 *     down(dqio_mutex)                    jbd2_journal_start()
4934 4935 4936 4937 4938 4939 4940
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
4941
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4942 4943
}

4944
static int ext4_write_dquot(struct dquot *dquot)
4945 4946 4947 4948 4949 4950
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
4951
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4952
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4953 4954 4955
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
4956
	err = ext4_journal_stop(handle);
4957 4958 4959 4960 4961
	if (!ret)
		ret = err;
	return ret;
}

4962
static int ext4_acquire_dquot(struct dquot *dquot)
4963 4964 4965 4966
{
	int ret, err;
	handle_t *handle;

4967
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4968
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4969 4970 4971
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
4972
	err = ext4_journal_stop(handle);
4973 4974 4975 4976 4977
	if (!ret)
		ret = err;
	return ret;
}

4978
static int ext4_release_dquot(struct dquot *dquot)
4979 4980 4981 4982
{
	int ret, err;
	handle_t *handle;

4983
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4984
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
4985 4986 4987
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
4988
		return PTR_ERR(handle);
J
Jan Kara 已提交
4989
	}
4990
	ret = dquot_release(dquot);
4991
	err = ext4_journal_stop(handle);
4992 4993 4994 4995 4996
	if (!ret)
		ret = err;
	return ret;
}

4997
static int ext4_mark_dquot_dirty(struct dquot *dquot)
4998
{
4999 5000 5001
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5002
	/* Are we journaling quotas? */
5003
	if (ext4_has_feature_quota(sb) ||
5004
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5005
		dquot_mark_dquot_dirty(dquot);
5006
		return ext4_write_dquot(dquot);
5007 5008 5009 5010 5011
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5012
static int ext4_write_info(struct super_block *sb, int type)
5013 5014 5015 5016 5017
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5018
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5019 5020 5021
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5022
	err = ext4_journal_stop(handle);
5023 5024 5025 5026 5027 5028 5029 5030 5031
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5032
static int ext4_quota_on_mount(struct super_block *sb, int type)
5033
{
5034 5035
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5036 5037
}

5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051
static void lockdep_set_quota_inode(struct inode *inode, int subclass)
{
	struct ext4_inode_info *ei = EXT4_I(inode);

	/* The first argument of lockdep_set_subclass has to be
	 * *exactly* the same as the argument to init_rwsem() --- in
	 * this case, in init_once() --- or lockdep gets unhappy
	 * because the name of the lock is set using the
	 * stringification of the argument to init_rwsem().
	 */
	(void) ei;	/* shut up clang warning if !CONFIG_LOCKDEP */
	lockdep_set_subclass(&ei->i_data_sem, subclass);
}

5052 5053 5054
/*
 * Standard function to be called on quota_on
 */
5055
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5056
			 struct path *path)
5057 5058 5059 5060 5061
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5062

5063
	/* Quotafile not on the same filesystem? */
5064
	if (path->dentry->d_sb != sb)
5065
		return -EXDEV;
5066 5067
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5068
		/* Quotafile not in fs root? */
5069
		if (path->dentry->d_parent != sb->s_root)
5070 5071 5072
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5073
	}
5074 5075 5076 5077 5078

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5079
	if (EXT4_SB(sb)->s_journal &&
5080
	    ext4_should_journal_data(d_inode(path->dentry))) {
5081 5082 5083 5084 5085
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5086
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5087
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5088
		if (err)
5089
			return err;
5090
	}
5091 5092 5093 5094 5095 5096
	lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
	err = dquot_quota_on(sb, type, format_id, path);
	if (err)
		lockdep_set_quota_inode(path->dentry->d_inode,
					     I_DATA_SEM_NORMAL);
	return err;
5097 5098
}

5099 5100 5101 5102 5103
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
5104
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5105
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5106 5107
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5108 5109
	};

5110
	BUG_ON(!ext4_has_feature_quota(sb));
5111 5112 5113 5114 5115 5116 5117 5118 5119 5120

	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
5121 5122
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5123
	lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5124 5125
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);
5126 5127
	if (err)
		lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5128 5129 5130 5131 5132 5133 5134 5135

	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
5136
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5137
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5138 5139
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5140 5141 5142
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
J
Jan Kara 已提交
5143
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5144 5145 5146 5147 5148
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5149 5150 5151
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5152 5153 5154 5155 5156 5157 5158
				return err;
			}
		}
	}
	return 0;
}

5159 5160
static int ext4_quota_off(struct super_block *sb, int type)
{
5161 5162 5163
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5164 5165 5166
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5167 5168
		sync_filesystem(sb);

5169 5170 5171
	if (!inode)
		goto out;

5172 5173
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5174
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5175 5176 5177 5178 5179 5180 5181
	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:
5182 5183 5184
	return dquot_quota_off(sb, type);
}

5185 5186
/* 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
5187
 * itself serializes the operations (and no one else should touch the files)
5188
 * we don't have to be afraid of races */
5189
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5190 5191 5192
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5193
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207
	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;
5208 5209 5210
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225
		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) */
5226
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5227 5228 5229
				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
5230
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5231
	int err, offset = off & (sb->s_blocksize - 1);
5232
	int retries = 0;
5233 5234 5235
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5236
	if (EXT4_SB(sb)->s_journal && !handle) {
5237 5238
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5239 5240 5241
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252
	/*
	 * 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;
	}

5253 5254 5255 5256 5257 5258
	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));
5259 5260
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5261 5262
	if (!bh)
		goto out;
5263
	BUFFER_TRACE(bh, "get write access");
5264 5265 5266
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5267
		return err;
5268
	}
5269 5270 5271 5272
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5273
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5274
	brelse(bh);
5275
out:
5276 5277
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5278
		EXT4_I(inode)->i_disksize = inode->i_size;
5279
		ext4_mark_inode_dirty(handle, inode);
5280
	}
5281
	return len;
5282 5283
}

5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294
static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
{
	const struct quota_format_ops	*ops;

	if (!sb_has_quota_loaded(sb, qid->type))
		return -ESRCH;
	ops = sb_dqopt(sb)->ops[qid->type];
	if (!ops || !ops->get_next_id)
		return -ENOSYS;
	return dquot_get_next_id(sb, qid);
}
5295 5296
#endif

A
Al Viro 已提交
5297 5298
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5299
{
A
Al Viro 已提交
5300
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5301 5302
}

J
Jan Kara 已提交
5303
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315
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);
}
5316 5317 5318

static inline int ext2_feature_set_ok(struct super_block *sb)
{
5319
	if (ext4_has_unknown_ext2_incompat_features(sb))
5320 5321 5322
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5323
	if (ext4_has_unknown_ext2_ro_compat_features(sb))
5324 5325 5326
		return 0;
	return 1;
}
5327 5328 5329
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5330
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344
#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);
}
5345 5346 5347

static inline int ext3_feature_set_ok(struct super_block *sb)
{
5348
	if (ext4_has_unknown_ext3_incompat_features(sb))
5349
		return 0;
5350
	if (!ext4_has_feature_journal(sb))
5351 5352 5353
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5354
	if (ext4_has_unknown_ext3_ro_compat_features(sb))
5355 5356 5357
		return 0;
	return 1;
}
5358

T
Theodore Ts'o 已提交
5359 5360 5361
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5362
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5363 5364 5365
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5366
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5367

5368 5369 5370
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];

5371
static int __init ext4_init_fs(void)
5372
{
5373
	int i, err;
5374

5375
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5376 5377 5378
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5379
	/* Build-time check for flags consistency */
5380
	ext4_check_flag_values();
5381

5382
	for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5383 5384
		init_waitqueue_head(&ext4__ioend_wq[i]);

5385
	err = ext4_init_es();
5386 5387
	if (err)
		return err;
5388 5389 5390

	err = ext4_init_pageio();
	if (err)
5391
		goto out5;
5392

5393
	err = ext4_init_system_zone();
5394
	if (err)
5395
		goto out4;
5396

5397
	err = ext4_init_sysfs();
T
Theodore Ts'o 已提交
5398
	if (err)
5399
		goto out3;
5400

5401
	err = ext4_init_mballoc();
5402 5403
	if (err)
		goto out2;
5404 5405 5406
	err = init_inodecache();
	if (err)
		goto out1;
5407
	register_as_ext3();
5408
	register_as_ext2();
T
Theodore Ts'o 已提交
5409
	err = register_filesystem(&ext4_fs_type);
5410 5411
	if (err)
		goto out;
5412

5413 5414
	return 0;
out:
5415 5416
	unregister_as_ext2();
	unregister_as_ext3();
5417 5418
	destroy_inodecache();
out1:
5419
	ext4_exit_mballoc();
5420
out2:
5421 5422
	ext4_exit_sysfs();
out3:
5423
	ext4_exit_system_zone();
5424
out4:
5425
	ext4_exit_pageio();
5426
out5:
5427 5428
	ext4_exit_es();

5429 5430 5431
	return err;
}

5432
static void __exit ext4_exit_fs(void)
5433
{
5434
	ext4_exit_crypto();
5435
	ext4_destroy_lazyinit_thread();
5436 5437
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5438
	unregister_filesystem(&ext4_fs_type);
5439
	destroy_inodecache();
5440
	ext4_exit_mballoc();
5441
	ext4_exit_sysfs();
5442 5443
	ext4_exit_system_zone();
	ext4_exit_pageio();
5444
	ext4_exit_es();
5445 5446 5447
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5448
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5449
MODULE_LICENSE("GPL");
5450 5451
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)